JP7264150B2 - Coil, coil pair, power transmitting device, power receiving device, and power transmission system - Google Patents

Description

The present invention belongs to the technical field of coils, coil pairs, power transmission devices, power reception devices, and power transmission systems, and more specifically, coils or coil pairs for contactless power transmission, and non-contact coils using the coils or coil pairs. It belongs to the technical field of contact-type power transmitting devices, power receiving devices, and power transmission systems.

2. Description of the Related Art In recent years, electric vehicles equipped with a storage battery such as a lithium ion battery have become popular. Since such an electric vehicle moves by driving a motor using electric power stored in a storage battery, efficient charging of the storage battery is required. Therefore, as a method of charging a storage battery mounted on an electric vehicle without physically connecting a charging plug or the like to the electric vehicle, a power receiving coil and a power transmitting coil that are separated from each other and facing each other are used, so-called wireless power transmission. Research is being conducted on Methods of wireless power transmission generally include an electric field coupling method, an electromagnetic induction method, a magnetic resonance method, and the like. When these methods are compared in terms of frequency used, horizontal and vertical positional freedom, and transmission efficiency, for example, wireless power transmission methods for charging storage batteries installed in electric vehicles , an electric field coupling method using a capacitor or a magnetic resonance method using a coil is considered promising, and research and development on these methods are being actively carried out. Prior art documents disclosing such background art include, for example, Patent Document 1 below. In the technique disclosed in Patent Document 1, a coil formed by winding a plurality of thin-film wires is laminated, and each coil is connected by vias arranged over the entire coil. It is

Japanese Patent Publication No. 2015-512155

However, in the technique disclosed in Patent Document 1, the coils are equipotential at the same position in each plane in which each coil is included, and as a result, the resonance frequency of the laminated coil as a whole is lowered. It does not contribute to frequency conversion. This poses a problem that the length of each coil cannot be shortened in adjusting the resonance frequency, and as a result, power loss and heat generation due to the electrical resistance of each coil cannot be suppressed. .

Therefore, the present invention has been made in view of the above problems, and one example of the problem is a coil for contactless power transmission that can effectively lower the resonance frequency of the coil. and a coil pair, a non-contact power transmitting device, a power receiving device, and a power transmission system using the coil or the coil pair.

Further, in the technique disclosed in Patent Document 1, suppression of leakage electromagnetic fields emitted from each coil is not considered at all. Therefore, there is a demand for a method of efficiently performing wireless power transmission to an electric vehicle while suppressing leakage electromagnetic fields.

Therefore, the present invention has been made in view of the above requirements, and another example of the problem is a coil and a coil pair for non-contact power transmission that can suppress leakage magnetic fields in wireless power transmission. , to provide a non-contact power transmission device, power reception device, and power transmission system using the coil or coil pair.

In order to solve the above problems, the invention according to claim 1 is a coil pair for contactless power transmission, in which a first coil for transmitting or receiving power is supplied with the power to be transmitted at the time of power transmission, a second coil for outputting received power when power is received, the second coil being laminated on the first coil, wherein the first coil extends inward from the outer circumference of the first coil; An outer and inner winding line wound toward the circumferential side, and an inner and outer winding line wound from the inner circumferential side of the first coil toward the outer circumferential side in the same winding direction as the outer and inner winding lines. wherein the outer and inner winding lines are wound on one plane, the inner and outer winding lines are wound on a plane different from the plane on which the outer and inner winding lines are wound, and In the first coil, the outer and inner winding lines and the inner and outer winding lines are overlapped with an insulating portion interposed therebetween so that the windings of the outer and inner winding lines and the windings of the inner and outer winding lines overlap. , the outermost peripheral end portion of the outer and inner winding lines and the outermost peripheral end portion of the inner and outer winding lines are open, and the cross-sectional area of the winding line that constitutes the second coil constitutes the first coil. The cross-sectional area of the facing winding line, which is the winding line that constitutes the first coil laminated at the position facing the second coil, is larger than the cross-sectional area of the winding line that is the first coil other than the facing winding line. is larger than the cross-sectional area of the winding line .

According to the invention of claim 1 , in the first coil that forms the coil pair together with the second coil, the winding direction of the inner and outer winding lines is the same as the winding direction of the inner and outer winding lines, and the outer and inner winding lines are wound in the same direction. and the inner and outer winding lines are wound on different planes, and the outer and inner winding lines and the inner and outer winding lines are overlapped so that the winding of the outer and inner winding lines and the winding of the inner and outer winding lines overlap. The outermost peripheral end portions of the outer and inner winding lines and the outermost peripheral end portions of the inner and outer winding lines are open. Therefore, when non-contact power transmission is performed with the coil pair facing each other, the resonance frequency of the coil pair can be effectively reduced, so when adjusting the resonance frequency, the length of each winding line can be shortened, and power loss and heat generation due to the electrical resistance of the winding line can be suppressed.
Further, the cross-sectional area of the facing winding line of the first coil laminated at a position facing the second coil formed by the winding line having a cross-sectional area larger than that of the winding line constituting the first coil is equal to the cross-sectional area of the facing winding line. Since it is larger than the cross-sectional area of the winding line of the first coil other than the line, the current density is increased relatively by increasing the cross-sectional area of the opposing winding line, so that the current density is leveled in the second coil. It is possible to improve the degree of freedom in the arrangement of the pair and the efficiency of using the winding material, and also to suppress the heat generation of the coil pair.

In order to solve the above problems, the invention according to claim 2 provides a coil pair for contactless power transmission, in which a first coil for transmitting or receiving power and the power to be transmitted at the time of power transmission are transmitted to the first coil. a second coil to which electric power supplied to the coil and received by the first coil when receiving electric power is supplied from the first coil, the second coil being laminated on the first coil; The first coil includes outer and inner winding lines wound from the outer circumference side to the inner circumference side of the first coil, and outer and inner winding lines wound from the inner circumference side to the outer circumference side of the first coil. Inner and outer winding lines wound in opposite directions are laminated with an insulating portion interposed therebetween, and the innermost peripheral end portion of the outer and inner winding lines and the innermost peripheral end portion of the inner and outer winding lines. , are connected, the outermost peripheral end portion of the outer and inner winding lines and the outermost peripheral end portion of the inner and outer winding lines are open, and the cross-sectional area of the winding line that constitutes the second coil is The cross-sectional area of the facing winding line, which is the winding line that constitutes the first coil laminated at a position facing the second coil, is larger than the cross-sectional area of the winding line that constitutes the first coil. It is configured to be larger than the cross-sectional area of the winding lines of the first coil other than the first coil .

According to the second aspect of the invention, in the first coil that forms a coil pair together with the second coil, the outer and inner winding lines and the inner and outer winding lines are overlapped, and the innermost peripheral end portions of the outer and inner winding lines and the innermost peripheral ends of the inner and outer winding lines wound in the opposite direction to the outer and inner winding lines are connected, and the outermost peripheral ends of the outer and inner winding lines and the outermost peripheral ends of the inner and outer winding lines are connected. and are open. Therefore, when non-contact power transmission is performed with the first coils facing each other, the frequency dependence of the change in the distance between the coil pairs in power transmission is small, so even if the distance changes, the frequency Power transmission with high transmission efficiency becomes possible without changing. In addition, the leakage magnetic field to the outside of the coil pair can be reduced, and the transmission efficiency can be increased by suppressing the reflection at the resonance frequency. Furthermore, since the resonance frequency of the first coil can be reduced due to the parasitic capacitance between the windings, the length of each winding can be shortened when adjusting the resonance frequency of the coil pair. Power loss and heat generation due to the electrical resistance of the winding line can be suppressed.
Further, the cross-sectional area of the facing winding line of the first coil laminated at a position facing the second coil formed by the winding line having a cross-sectional area larger than the cross-sectional area of the winding line constituting the first coil is equal to the cross-sectional area of the facing winding line. Since it is larger than the cross-sectional area of the winding line of the first coil other than the line, the current density is increased relatively by increasing the cross-sectional area of the opposing winding line, so that the current density is leveled in the second coil. It is possible to improve the degree of freedom in the arrangement of the pair and the efficiency of use of the winding line material, and also to suppress the heat generation of the coil pair.

In order to solve the above problems, the invention according to claim 3 provides the coil pair according to claim 1 or claim 2 , wherein the self-resonance frequencies of the outer and inner windings and the self-resonance frequencies of the inner and outer windings are different from each other.

According to the invention of claim 3 , in addition to the effects of the invention of claim 1 or claim 2 , the self-resonant frequencies of the outer and inner windings and the self-resonant frequencies of the inner and outer windings mutually Since they are different, the resonance frequency of the coil pair as a whole can be reduced by lowering the mutual resonance frequency between the outer and inner windings and the inner and outer windings.

In order to solve the above problems, the invention according to claim 4 provides the coil pair according to any one of claims 1 to 3 , wherein the second coil is a winding line that constitutes the second coil. The position of the coil winding in the radial direction of the coil pair is between the outermost and innermost windings and the innermost and innermost windings of the outer and inner windings, and the width of the second coil winding is , the distance in the radial direction between the center lines of the outer/inner winding lines and the inner/outer winding lines.

According to the invention recited in claim 4 , in addition to the effects of the invention recited in any one of claims 1 to 3 , the radial positions of the second coil winding lines It is between the outermost edge and the innermost edge of the winding of the inner and outer winding lines, and the width of the second coil winding line is the outer and inner winding lines and the inner and outer winding lines of the inner and outer winding lines Wider than the radial spacing of the line centerlines. Therefore, the resonance frequency of the coil pair can be lowered by increasing the parasitic capacitance between the outer and inner windings and between the inner and outer windings and the second coil winding. Therefore, when adjusting the resonance frequency of the coil pair, the length of each winding can be shortened, and power loss and heat generation due to the electrical resistance of the winding can be suppressed.

In order to solve the above problems, the invention according to claim 5 is the coil pair according to any one of claims 1 to 4 , wherein the insulating part is a dielectric. .

According to the invention of claim 5 , in addition to the effects of the invention of any one of claims 1 to 4 , since the insulating part is a dielectric, the coil as a whole or the coil pair as a whole can reduce the resonance frequency of

In order to solve the above problems, the invention according to claim 6 provides the coil pair according to any one of claims 1 to 5 , wherein the third coil connected to the first coil is The outer and inner winding lines, the inner and outer winding lines, and the third coil are each formed in the same layer as the second coil in the coil pair by winding a thin film wire that is flat in the radial direction of the coil pair. formed.

According to the invention of claim 6 , in addition to the effect of the invention of any one of claims 1 to 5 , the third coil connected to the first coil for power transmission or power reception is Since it is formed in the same layer as the second coil in the coil pair, it is possible to improve the transmission efficiency of the coil pair, reduce the size of the coil pair, and reduce the manufacturing (material) cost.

In addition, since each of the outer and inner windings , the inner and outer windings, and the windings of the third coil is formed by winding a flat thin film wire in the radial direction of the coil pair, it is possible to effectively adjust the resonance frequency between the coils. can be done.

In order to solve the above problems, the invention according to claim 7 comprises a power transmitting device and a power receiving device separated from the power transmitting device, and transmits power from the power transmitting device to the power receiving device in a contactless manner. 6. In the power transmission device included in the power transmission system, the power transmission coil pair being the coil pair according to any one of claims 1 to 5 , wherein the power transmission coil pair is arranged to face the power reception device. a coil pair; and output means for outputting power to be transmitted to the second coil of the power transmission coil pair.

In order to solve the above problems, the invention according to claim 8 comprises a power transmitting device and a power receiving device separated from the power transmitting device, and transmits power from the power transmitting device to the power receiving device in a contactless manner. 6. In the power receiving device included in the power transmission system, the power receiving coil pair being the coil pair according to any one of claims 1 to 5 , wherein the power receiving device is arranged to face the power transmitting device. a coil pair; and input means connected to the second coil of the receiving coil pair.

In order to solve the above problems, the invention according to claim 9 is the power transmission device according to claim 7 , and a power reception device that is separated from the power transmission device and arranged to face the power transmission coil pair. a power receiving device that receives power transmitted from the power transmitting device.

In order to solve the above problems, the invention according to claim 10 provides a power transmission device and a power reception device according to claim 8 , wherein the power transmission device is separated from the power transmission device and the power reception coil pair is connected to the power transmission device. and a power receiving device arranged to face each other and receiving power transmitted from the power transmitting device.
Effect of the invention

According to one aspect of the present invention, in the first coil that forms a coil pair together with the second coil, the winding direction of the inner and outer winding lines is the same as the winding direction of the inner and outer winding lines, and the outer and inner winding lines and the inner and outer winding lines are wound in the same direction. The winding lines are wound on different planes, and the outer and inner winding lines and the inner and outer winding lines are overlapped so that the winding of the outer and inner winding lines and the winding of the inner and outer winding lines overlap, The outermost peripheral end portions of the outer and inner winding lines and the outermost peripheral end portions of the inner and outer winding lines are open.

Therefore, when non-contact power transmission is performed with the coil pair facing each other, the resonance frequency of the coil pair can be effectively reduced. can be shortened, and power loss and heat generation due to the electrical resistance of the winding line can be suppressed.
Further, the cross-sectional area of the facing winding line of the first coil laminated at a position facing the second coil formed by the winding line having a cross-sectional area larger than that of the winding line constituting the first coil is equal to the cross-sectional area of the facing winding line. Since it is larger than the cross-sectional area of the winding line of the first coil other than the line, the current density is increased relatively by increasing the cross-sectional area of the opposing winding line, so that the current density is leveled in the second coil. It is possible to improve the degree of freedom in the arrangement of the pair and the efficiency of using the winding material, and also to suppress the heat generation of the coil pair.

According to another aspect of the present invention, in the first coil forming a coil pair together with the second coil, the outer and inner winding lines and the inner and outer winding lines are overlapped, and the innermost peripheral ends of the outer and inner winding lines and the innermost peripheral end portions of the inner and outer winding lines wound in the opposite direction to the outer and inner winding lines are connected, and and are open.

Therefore, when non-contact power transmission is performed with the first coils facing each other, the frequency dependence of the change in the distance between the coil pairs in power transmission is small, so even if the distance changes, the frequency can be changed. Power transmission with high transmission efficiency becomes possible without changing. In addition, the leakage magnetic field to the outside of the coil pair can be reduced, and the reflection at the resonance frequency can be suppressed to increase the transmission efficiency. Furthermore, since the resonance frequency of the first coil can be reduced due to the parasitic capacitance between the windings, the length of each winding can be shortened when adjusting the resonance frequency of the coil pair. Power loss and heat generation due to the electrical resistance of the winding line can be suppressed.
Further, the cross-sectional area of the facing winding line of the first coil laminated at a position facing the second coil formed by the winding line having a cross-sectional area larger than that of the winding line constituting the first coil is equal to the cross-sectional area of the facing winding line. Since it is larger than the cross-sectional area of the winding line of the first coil other than the line, the current density is increased relatively by increasing the cross-sectional area of the opposing winding line, so that the current density is leveled in the second coil. It is possible to improve the degree of freedom in the arrangement of the pair and the efficiency of using the winding material, and also to suppress the heat generation of the coil pair.

1 is a block diagram showing a schematic configuration of a power transmission system according to a first embodiment; FIG. It is a top view (i) which shows the structure of the coil of 1st Embodiment. It is a top view (ii) which shows the structure of the coil of 1st Embodiment. It is a top view (iii) which shows the structure of the coil of 1st Embodiment. It is a top view (iv) which shows the structure of the coil of 1st Embodiment. It is a top view (v) which shows the structure of the coil of 1st Embodiment. It is a partial cross-sectional view showing the structure of the coil of the first embodiment. It is a figure which shows the effect etc. by the structure of the coil of 1st Embodiment, (a) is a figure which shows the said effect, (b) is a figure which shows the comparative example (conventional example) about the said effect. It is a top view (i) which shows the structure of the coil of 2nd Embodiment. It is a top view (ii) which shows the structure of the coil of 2nd Embodiment. FIG. 6 is a partial cross-sectional view showing the structure of the coil of the second embodiment; It is a figure which shows the effect etc. by the structure of the coil of 2nd Embodiment, (a) is a figure which shows the said effect, (b) is a figure which shows the comparative example (conventional example) about the said effect. It is a figure which shows the effect by the structure of the coil of 2nd Embodiment. It is a block diagram which shows the schematic structure of the power transmission system of 3rd Embodiment. It is a top view (i) which shows the structure of the coil of 3rd Embodiment. It is a top view (ii) which shows the structure of the coil of 3rd Embodiment. It is a top view (iii) which shows the structure of the coil of 3rd Embodiment. It is a top view (iv) which shows the structure of the coil of 3rd Embodiment. It is a top view (v) which shows the structure of the coil of 3rd Embodiment. FIG. 11 is a partial cross-sectional view showing the structure of the coil of the third embodiment; FIG. 10A is a diagram showing an effect of the structure of the coil of the third embodiment, etc. FIG. 11A is a diagram showing a conventional example of the effect, and FIG. FIG. 4 is a diagram showing relationships; FIG. 10 is a diagram showing the S parameter-frequency relationship as an effect of the coil structure of the third embodiment; It is a top view (i) which shows the structure of the coil of 4th Embodiment. It is a top view (ii) which shows the structure of the coil of 4th Embodiment. It is a top view (iii) which shows the structure of the coil of 4th Embodiment. It is a top view (iv) which shows the structure of the coil of 4th Embodiment. FIG. 11 is a partial cross-sectional view showing the structure of the coil of the fourth embodiment; It is a diagram showing the effect of the structure of the coil of the fourth embodiment, etc., (a) is a diagram showing the relationship between the resonance frequency and the value of the S parameter as the effect, (b) is a conventional FIG. 4 is a diagram showing an example; It is a diagram showing the effect of the structure of the coil of the fourth embodiment, (a) is a diagram showing the relationship between the reflection / transmission efficiency - frequency as the effect, (b) is the S parameter - frequency as the effect is a diagram showing the relationship of FIG. 10 is a diagram showing the relationship between magnetic field intensity and distance as an effect of the coil structure of the fourth embodiment; It is a plan view (i) showing the structure of the coil of the 5-1 embodiment. It is a plan view (ii) showing the structure of the coil of the 5-1 embodiment. It is a plan view (iii) showing the structure of the coil of the 5-1 embodiment. It is a plan view (iv) showing the structure of the coil of the 5-1 embodiment. It is a plan view (v) showing the structure of the coil of the 5-1 embodiment. It is a partial cross-sectional view showing the structure of the coil of the 5-1 embodiment. FIG. 14 is a diagram showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 5-1 embodiment. It is a plan view (i) showing the structure of the coil of the 5-2 embodiment. It is a plan view (ii) showing the structure of the coil of the 5-2 embodiment. It is a plan view (iii) showing the structure of the coil of the 5-2 embodiment. FIG. 12(i) is a diagram (i) showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 5-2 embodiment. FIG. 12B is a diagram (ii) showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 5-2 embodiment. FIG. 14 is a diagram (iii) showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 5-2 embodiment. It is a plan view (i) showing the structure of the coil of the 5-3rd embodiment. It is a plan view (ii) showing the structure of the coil of the 5-3rd embodiment. It is a top view (i) which shows the structure of the coil of 6th Embodiment. It is a top view (ii) which shows the structure of the coil of 6th Embodiment. It is a top view (iii) which shows the structure of the coil of 6th Embodiment. It is a top view (iv) which shows the structure of the coil of 6th Embodiment. FIG. 14 is a partial cross-sectional view showing the structure of the coil of the sixth embodiment; It is a diagram showing the effect of the structure of the coil of the sixth embodiment, etc., (a) is a diagram showing the relationship between the resonance frequency and the value of the S parameter related to the reflectance as the effect, (b) FIG. 10 is a diagram showing the relationship between the resonance frequency as the effect and the value of the S parameter related to transmission efficiency; The relationship between the width of the copper thin film wire that constitutes the loop coil and the resonance frequency as an effect of the coil structure of the sixth embodiment is shown by the relationship with the overall width of one side of the copper thin film wire that constitutes the open coil of the embodiment. FIG. 10 is a graph diagram showing FIG. FIG. 12 is a block diagram showing a schematic configuration of a power transmission system according to a seventh embodiment; FIG. It is a top view (i) which shows the structure of the coil of 7th Embodiment. It is a top view (ii) which shows the structure of the coil of 7th Embodiment. It is a top view (iii) which shows the structure of the coil of 7th Embodiment. FIG. 21 is a partial cross-sectional view showing the structure of the coil of the seventh embodiment; FIG. 12 is a diagram showing the relationship between the winding line number and the current density as an effect of the coil structure of the seventh embodiment; It is a top view (i) which shows the structure of the coil of 8th Embodiment. It is a top view (ii) which shows the structure of the coil of 8th Embodiment. It is a top view (iii) which shows the structure of the coil of 8th Embodiment. FIG. 22 is a plan view (iv) showing the structure of the coil of the eighth embodiment; FIG. 21 is a plan view (v) showing the structure of the coil of the eighth embodiment; FIG. 64 is a cross-sectional view of the A-A' portion of FIGS. 62 and 63; FIG. 64 is a cross-sectional view of the B-B' portion of FIGS. 59, 62 and 63; FIG. 20 is a graph showing the effects of different dielectric materials in the coil of the eighth embodiment; FIG. 10 is a cross-sectional view showing the structure of each coil of an eighth embodiment and a comparative form, where (a) is a cross-sectional view taken along line BB′ of FIGS. 1, 5 and 6, and (b) is a first comparison; FIG. 4C is a cross-sectional view of the corresponding portion in the coil of the second comparative example, and (d) is a cross-sectional view of the corresponding portion in the coil of the third comparative example. is. FIG. 21 is a graph showing differences in effects due to differences in the structure of the coils of the eighth embodiment; It is a plan view (i) showing the structure of the coil of the 9-1 embodiment. It is a plan view (ii) showing the structure of the coil of the 9-1 embodiment. It is a plan view (iii) showing the structure of the coil of the 9-1 embodiment. It is a partial cross-sectional view showing the structure of the coil of the 9-1 embodiment. FIG. 20 is a graph showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 9-1 embodiment. FIG. 20 is a graph showing the relationship between the leakage magnetic field and the distance as an effect of the coil structure of the 9-1 embodiment. It is a plan view showing the structure of the coil of the 9-2 embodiment.

Next, the form for implementing this invention is demonstrated based on drawing. It should be noted that each embodiment and each modification described below are applied to a power transmission system for wirelessly transmitting power for charging a rechargeable battery mounted on an electric vehicle to the rechargeable battery according to the present invention. It is an embodiment and a modification when applying. At this time, the non-contact power transmission is performed by, for example, the magnetic resonance method. The present invention can also be applied to power transmission methods other than the magnetic resonance method.

(a) First embodiment
(I) Overall configuration and operation of power transmission system
First, the overall configuration and operation of the power transmission system of the first embodiment will be described with reference to FIG. Note that FIG. 1 is a block diagram showing a schematic configuration of the power transmission system of the first embodiment.

As shown in FIG. 1, the power transmission system S1 of the first embodiment includes a power receiving device R including a power receiving unit RV and a power receiving coil RC1 for receiving power, and a power transmitting device R including a power transmitting unit TR and a power transmitting coil TC1 for power transmission. It is configured by a device T and At this time, the power receiving device R is mounted on the electric vehicle and connected to a storage battery (not shown) mounted on the electric vehicle. On the other hand, the power transmission device T is installed (including buried, hereinafter the same) on the ground where the electric vehicle moves or stops. When charging the storage battery, the electric vehicle is driven or stopped so that the power receiving coil RC1 of the power receiving device R and the power transmitting coil TC1 of the power transmitting device T face each other (that is, face each other). When charging the above-described storage battery by the power transmission system S1 of the first embodiment, the power transmission device installed on the ground below the stop position of the power receiving device R mounted on the stopped electric vehicle is charged. It can be configured to transmit power from the power transmission device T via the power transmission coil TC1 of T. In addition, a power receiving device R mounted on a moving electric vehicle may be supplied with electric power through the power transmitting coils TC1 of a plurality of power transmitting devices T embedded in a section of a certain distance on the road on which the electric vehicle is moving. , the power transmission device T may be configured to transmit power continuously. In this case, the power transmission section TR corresponds to an example of the "output means" of the present invention, and the power reception section RV corresponds to an example of the "input means" of the present invention. The manner in which the power transmitting device T and the power receiving device R are installed, and the manner in which electric power is transmitted to an electric vehicle that is stopped or moving are all equally applied to other embodiments and modifications described later.

In the above configuration, the power transmission unit TR of the power transmission device T outputs power to be transmitted to the power reception device R to the power transmission coil TC1 while complying with regulations such as the Radio Law of the country where the power transmission system S1 is used. At this time, the above regulations regulate that the leakage magnetic field, which takes into account the influence on the human body and peripheral electronic devices, is below a predetermined level. Further, in order to enable interconnection between all the power transmitting devices T and the power receiving devices R, it is necessary for both to use frequencies within a predetermined range. Therefore, the frequency or frequency band in the predetermined range must comply with the recommendations of international organizations such as ISO (International Organization for Standardization) or IEC (International Electrotechnical Commission). In addition, since the above-mentioned international organization also defines the lower limit of the transmission efficiency in consideration of the predetermined positional deviation between the power transmission coil TC1 and the power reception coil RC1, high power transmission efficiency is required. It should be noted that the circumstances related to the above laws and regulations are all equally applied to other embodiments and modifications described later.

On the other hand, the power receiving coil RC1 of the power receiving device R that has received power from the power transmitting coil TC1 by the magnetic field resonance method outputs a power receiving current corresponding to the received power to the power receiving unit RV. As a result, the power receiving unit RV converts an output corresponding to the received current (e.g., high frequency power of 85 kHz) into a DC (direct current) current by a power conversion unit (not shown), for example, and outputs it to the storage battery of the electric vehicle. As a result, the storage battery is charged with the necessary amount of electric power. It should be noted that the mechanism of charging the storage battery with electric power is also applied in the same way to other embodiments and modifications described later.

(II) Configuration of power transmitting coil TC (power receiving coil RC)
Next, configurations of the power transmission coil TC1 and the power reception coil RC1 of the first embodiment, which are used in the power transmission system S1 of the first embodiment described above, will be described with reference to FIGS. 2 to 7. FIG. Since the power transmitting coil TC1 and the power receiving coil RC1 of the first embodiment basically have the same configuration, the power transmitting coil TC1 will be described below. 2 to 6 are plan views respectively showing the structure of the power transmission coil TC1 of the first embodiment, and FIG. 7 is a partial cross-sectional view showing the structure of the power transmission coil TC1 of the first embodiment.

As shown in the plan view of FIG. 2, the power transmission coil TC1 of the first embodiment is configured by laminating four coils CL1-1 to CL1-4, which will be described later, with an insulating film BF1 interposed therebetween. be done. In the first embodiment, the film BF1 is used for insulation between the coils CL1-1 to CL1-4, but an insulating material such as a glass epoxy material can also be used. . Further, in order to efficiently dissipate the heat generated by the power transmission coil TC1, for example, ceramic particles or the like may be dispersed to use a thin film material.

Here, in the power transmission coil TC1, the coils are stacked in the order of coil CL1-1→coil CL1-3→coil CL1-2→coil CL1-4 from the front side of the paper surface of FIG. Further, the winding centers of the thin copper film wires, which will be described later, constituting the coils CL1-1 to CL1-4, respectively, are the same or substantially the same. At this time, the coils CL1-1 and CL1-2 correspond to an example of the "outer/inner winding lines" of the present invention, and the coils CL1-3 and CL1-4 correspond to an example of the "inner/outer winding lines" of the present invention. do. Also, the connection terminal O1-1 and the connection terminal O1-2 described below each correspond to an example of the "external connection terminal" of the present invention.

As shown in the plan view of FIG. 2, the coil CL1-1 forming the power transmission coil TC1 has a connection terminal O1-1 for external connection on its outermost periphery. The coil CL1-1 is formed by winding, for example, a copper thin film wire in a spiral shape three and a half turns counterclockwise starting from the connection terminal O1-1. In addition, vias V1-1-3 are connected to the innermost peripheral portion thereof for forming an electrical connection with the coils CL1-3 layered directly under them in FIG. The copper thin film wire forming the coil CL1-1 has the same width and thickness over the entire circumference of the coil CL1-1. Further, in the coil CL1-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

Next, the configuration of the coil CL1-3 laminated directly below the coil CL1-1 via the film BF1 will be described with reference to FIG. FIG. 3 is a plan view showing only the coils CL1-3.

As shown in FIG. 3, the via V1-1-3 for forming an electrical connection with the coil CL1-1 is connected to the innermost circumference of the coil CL1-3 that constitutes the power transmission coil TC1. It is That is, the coil CL1-1 and the coil CL1-3 are connected in series. Then, the coil CL1-3 rotates counterclockwise starting from the via V1-1-3 (that is, in the same direction as the coil CL1-1), for example, the copper thin film wire spirals three times in the same manner as the coil CL1-1. It is configured by being half-wound. In addition, vias V1-3-2 are connected to the outermost periphery thereof for forming an electrical connection with the coil CL1-2 layered directly under it in FIG. The copper thin film wire forming the coil CL1-2 has the same width and the same thickness over the entire circumference of the coil CL1-2, like the coil CL1-1. Furthermore, in the coil CL1-2, like the coil CL1-1, parallel straight lines are provided on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the positional relationship between the copper thin film wires forming the coil CL1-1 and the coil CL1-3 will be described with reference to FIG. FIG. 4 is a plan view showing how the coil CL1-1 and the coil CL1-3 are overlapped. The coils CL1-3 stacked in between are indicated by dashed lines.

As shown in FIG. 4, the coil CL1-1 wound from the outer circumference to the inner circumference and connected to the coil CL1-3 by the via V1-1-3 at its innermost circumference has a quarter turn. Each time, the position of the straight part is 1/4 of the winding pitch of the copper thin film wire (that is, the distance in the radial direction of the winding of the center line of the copper thin film wire on each side; the same applies hereinafter) Each curved part is formed and the copper thin film wire is wound so as to shift toward the inner peripheral side. On the other hand, in the coil CL1-3 wound in the same direction as the coil CL1-1 from the inner circumference to the outer circumference and connected to the coil CL2 by the via V1-3-2 at the outermost circumference, every quarter turn Then, the copper thin film wire is wound with each curved portion formed so that the position of the straight portion is shifted to the outer peripheral side by a quarter of the pitch. As a result, in the power transmitting coil TC1 in which the coil CL1-1 and the coil CL1-3 are stacked, the coil CL1-1 and the coil CL1-3 are arranged on the side extending in the vertical direction in FIG. It is laminated so that the copper thin film wire|line which comprises is overlapped.

Next, the configuration of the coil CL1-2 laminated directly below the coil CL1-3 via the film BF1 will be described with reference to FIG. FIG. 5 is a plan view showing only the coil CL1-2.

As shown in FIG. 5, the coil CL1-2 constituting the power transmission coil TC1 basically has the same configuration as the coil CL1-1, and the coil CL1-3 and the The vias V1-3-2 are connected to form an electrical connection between. That is, the coils CL1-2 and CL1-3 are connected in series. Similarly to the coil CL1-1, the coil CL1-2 is formed by spirally winding a thin copper wire three and a half times counterclockwise starting from the via V1-3-2. Further, vias V1-2-4 are connected to the innermost peripheral portion thereof for forming electrical connection with the coils CL1-4 stacked directly under them in FIG. The copper thin film wire forming the coil CL1-2 has the same width and thickness over the entire circumference of the coil CL1-2, like the coils CL1-1 and CL1-3. Furthermore, in the coil CL1-2, like the coils CL1-1 and CL1-3, parallel straight lines are provided on the upper side, the lower side, the left side, and the right side in FIG. are connected by substantially concentric arc-shaped curved portions.

Next, the configuration of the coils CL1-4 stacked immediately below the coils CL1-2 via the film BF1 will be described with reference to FIG. FIG. 6 is a plan view showing only the coils CL1-4.

As shown in FIG. 6, the coil CL1-4 constituting the power transmission coil TC1 is connected to the via V1-2-4 at the innermost peripheral portion thereof for forming an electrical connection with the coil CL1-2. It is That is, the coils CL1-3 and CL1-4 are connected in series. The coil CL1-4 then rotates counterclockwise starting from the via V1-2-4 (that is, in the same direction as the coil CL1-2), like the coils CL1-1 to CL1-3. It is spirally wound three and a half turns. In addition, it has a connection terminal O1-2 for external connection on its outermost periphery. The copper thin-film wires forming the coils CL1-4 have the same width and thickness over the entire circumference of the coils CL1-4, like the coils CL1-1 to CL1-3. Further, in the coil CL1-4, similarly to the coils CL1-1 to CL1-3, the upper side, the lower side, the left side, and the right side in FIG. are connected by substantially concentric arc-shaped curved portions.

Here, the positional relationship between the copper thin film wires constituting the coil CL1-2 and the coil CL1-4 is the same as the positional relationship between the coil CL1-1 and the coil CL1-3 described with reference to FIG. is.

Next, the connection state of the coils CL1-1 to CL1-4 will be described with reference to FIG. 7 as a cross-sectional view taken along the line A-A' shown in FIG.

As shown in FIG. 7, on the left side of FIGS. 2 to 6, the coil CL1-1 and the coil CL1-3 are laminated with the film BF1 interposed therebetween, and the coil CL1-1 and the coil CL1-3 are separated by vias. are electrically connected by V1-1-3. On the other hand, on the same left side, the coil CL1-2 and the coil CL1-4 are laminated with the film BF1 interposed therebetween, and the coil CL1-2 and the coil CL1-4 are electrically connected by the via V1-2-4. It is On the other hand, on the right side of FIGS. 2 to 6, although not shown, the coils CL1-1 to CL1-4 are similarly stacked with the film BF1 interposed therebetween. CL1-3 and coil CL1-2 are electrically connected. The coil CL1-1 and the coil CL1-4 each have a connection terminal O1-1 and a connection terminal O1-2 on the outermost periphery. These connection terminal O1-1 and connection terminal O1-2 are connected to the power transmission section TR in the case of the power transmission coil TC1, and are connected to the power reception section RC in the case of the power reception coil RC1. As the power transmission coil TC1 of the first embodiment, a four-layer structure composed of the coils CL1-1 to CL1-4 described above has been described. It has been confirmed by experiments by the inventors of the present invention that the expected effect can be obtained if Therefore, the number of coils (the number of layers) constituting the power transmission coil TC1 (or the power reception coil RC1) is determined in consideration of the purpose and cost of the power transmission system S1 of the first embodiment. number) configuration is selected.

(III) Manufacturing method of power transmitting coil TC1 and power receiving coil RC1
Next, a method for manufacturing the power transmitting coil TC1 and the power receiving coil RC1 of the first embodiment will be described.

As the manufacturing method, basically the same as the conventional method, the first manufacturing method including the following steps (a)-1 to (a)-7, or the following (b)-1 to (b)-9 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Forming a thin copper film on both sides of the film BF1 (formation of two sets)
(a)-2: For each set, apply a resist on the copper thin film (both sides) formed in (a)-1 above. (a)-3: For each set, apply the resist to each coil. Patterning of copper thin-film wires such as CL1-1 (a)-4: For each of the above sets, etching is performed after the patterning to form copper thin-film wires as each coil CL1-1 etc. (a)-5: Above ( a)-1 to (a)-4 forming a set of the coil CL1-1 and the coil CL1-3 on both sides thereof, and the above-mentioned (a)-1 to (a)-4 forming the coil CL1-2 and the coil CL1 -4 is formed on both sides thereof, and a new film BF1 is sandwiched between them (a)-6: the via V1-1-3, the via V1-2-3, and the via V1-2 -4 is formed (a)-7: Connection between the connection terminal O1-1 and the connection terminal O1-2 and the power transmission unit TR (in the case of the power transmission device T) or the power reception unit RV (in the case of the power reception device R) (b) Second manufacturing method
(b)-1: Forming a thin copper film on both sides of the film BF1 (formation of two sets)
(b)-2: For each of the above pairs, through holes are formed at positions corresponding to the vias V1-1-3 or V1-2-4 using a laser or the like. (b)-3: For each of the above pairs, the through holes are formed. Copper plating treatment by electroless copper plating method and electrolytic copper plating method is applied to the whole to form vias V1-1-3 and vias V1-2-4 (b)-4: For each of the above sets, the above (b )-3: Applying a resist to each of the copper plating (both sides) formed in step (b)-5: For each of the above groups, patterning the applied resist on the copper thin-film wires of each coil CL1-1, etc. (b)- 6: Each set is subjected to an etching process after the patterning to form a copper thin film wire as each coil CL1-1, etc. (b)-7: Coil CL1- by the above (b)-1 to (b)-6 1 and coils CL1-3 formed on both sides thereof, and a set having coils CL1-2 and coils CL1-4 formed on both sides thereof by the above (b)-1 to (b)-6, Paste with a new film BF1 sandwiched (b)-8: Form the vias V1-2-3 (b)-9: Connection terminal O1-1 and connection terminal O1-2 and power transmission unit TR (power transmission device T) or connection with the power receiving unit RV (in the case of power receiving device R)

(IV) First embodiment
Next, regarding the effect of performing power transmission using the power transmission system S1 of the first embodiment including the power transmission coil TC1 and the power reception coil RC1 of the first embodiment, based on the results of experiments conducted by the inventors of the present application, Description will be made with reference to FIG. 8 and Table 1. Note that in the following description, the effect of performing power transmission using the power transmission system S1 of the first embodiment will be compared with the effect of performing power transmission using the power transmission system of the conventional example. explain. As a conventional example in the case described below, a power transmitting coil and a power receiving coil each composed of a coil having a six-turn structure in one layer are connected to the outside by a lead wire extending from the innermost coil end to the coil itself. A power transmission system including a power transmission coil and a power reception coil having a structure for performing

Also, the structures of the power transmitting coil TC1 and the power receiving coil RC1 of the first embodiment whose effects are shown in FIG. is provided with only the coil CL1-1 and the coil CL1-4, and the coil CL1-1 and the coil CL1-4 are electrically connected at their innermost peripheral portions. It has a layered structure.

即ち、第１実施形態の送電コイルＴＣ１及び受電コイルＲＣ１を含む第１実施形態の電力伝送システムＳ１を用いた電力伝送と、従来例の電力伝送システムを用いた電力伝送と、を、それぞれ、「共振周波数（ＭＨｚ）」、「Ｓパラメータ」、「入射率」、「伝送効率（全体）」及び「伝送効率（コイル間）」の各諸元について比較した。ここで上記入射率とは、送電コイルＴＣ１への供給電力（即ち送電コイルＴＣ１への入力電力－送電コイルＴＣ１での反射電力）を当該入力電力で除したパラメータ（供給電力／入力電力）である。また上記伝送効率（全体）とは、受電コイルＲＣ１から出力される伝送電力を送電コイルＴＣ１に対する入力電力で除したパラメータ（伝送電力／入力電力）である。更に上記伝送効率（コイル間）とは、受電コイルＲＣ１から出力される伝送電力を送電コイルＴＣ１への供給電力で除したパラメータ（伝送電力／供給電力）である。

That is, the power transmission using the power transmission system S1 of the first embodiment including the power transmission coil TC1 and the power reception coil RC1 of the first embodiment and the power transmission using the power transmission system of the conventional example are each referred to as " Comparison was made with respect to each item of resonance frequency (MHz), S parameter, incidence rate, transmission efficiency (overall), and transmission efficiency (between coils). Here, the incidence rate is a parameter (supplied power/input power) obtained by dividing the power supplied to the power transmission coil TC1 (that is, the input power to the power transmission coil TC1−the reflected power at the power transmission coil TC1) by the input power. . The transmission efficiency (overall) is a parameter (transmission power/input power) obtained by dividing the transmission power output from the power receiving coil RC1 by the input power to the power transmission coil TC1. Further, the transmission efficiency (between coils) is a parameter (transmission power/supply power) obtained by dividing the transmission power output from the power receiving coil RC1 by the power supplied to the power transmission coil TC1.

As shown in FIG. 8 and Table 1, the power transmission using the power transmission system S1 of the first embodiment including the power transmission coil TC1 and the power reception coil RC1 of the first embodiment is similar to that of the conventional power transmission system. For transmission, an improvement in the incidence rate due to a reduction in the parameter S11 in the S-parameters (i.e. a reduction in the reflected power in the transmitting coil TC1), and a reduction in the parameter S21 in the S-parameters for transmission efficiency (overall) and transmission efficiency (between coils) Along with the improvement of the resonance frequency, a lower resonance frequency is realized.

As described above, according to the power transmission using the power transmission system S1 of the first embodiment including the power transmission coil TC1 and the power reception coil RC1 of the first embodiment, the windings of the coil CL1-1 and the coil CL1-2 Each coil is arranged so that the center of the winding coincides with the center of the winding of the coil CL1-3 and the coil CL1-4 wound in the same winding direction as the coil CL1-1 and the coil CL1-2. The coil CL1-1 and the coil CL1-4 are stacked with the film BF1 interposed therebetween, and the outermost peripheral portions of the coil CL1-1 and the coil CL1-4 are used as the connection terminal O1-1 and the connection terminal O1-2, respectively. Therefore, when the power transmission coil TC1 and the power reception coil RC1 are opposed to each other to perform non-contact power transmission, the leakage magnetic field to the outside of the power transmission coil TC1 or the power reception coil RC1 can be reduced. The transmission efficiency can be increased by suppressing the reflection between the terminals O1 and O2. Also, the resonance frequency of the power transmitting coil TC1 or the power receiving coil RC1 is lowered due to an increase in parasitic capacitance between the coils CL1-1 and the like due to the stacking of the coils CL1-1 and the like. Therefore, when adjusting the resonance frequency of the power transmission coil TC1 or the power reception coil RC1, the length of each copper thin film wire can be shortened, and power loss and heat generation due to the electrical resistance of the copper thin film wire can be suppressed. can.

In addition, the innermost peripheral end of the coil CL1-1 (coil CL1-2) and the innermost peripheral end of the coil CL1-3 (coil CL1-4) are connected to form a series connection. Since the outermost peripheral ends of the CL1-1 and the coil CL1-4 are used as the connection terminal O1-1 and the connection terminal O1-2, respectively, it is necessary to straddle one of the copper thin film wires to pull out the connection terminal. Therefore, it is possible to reduce the leakage magnetic field caused by the straddling.

Further, a series connection configured by connecting the innermost peripheral end of the coil CL1-1 and the innermost peripheral end of the coil CL1-3, the innermost peripheral end of the coil CL1-2 and the coil CL1-4. and a series connection configured by connecting the innermost peripheral end of the coil CL1-3 to the outermost peripheral end of the coil CL1-2. Since the outermost peripheral end of the coil CL1-1 and the outermost peripheral end of the coil CL1-4 are the connection terminal O1-1 and the connection terminal O1-2, respectively, the power transmission coil A large amount of electric power can be transmitted in a contactless manner while further reducing the leakage magnetic field to the outside of the TC1 and the receiving coil RC1.

Furthermore, each of the coils CL1-1 to CL1-4 is formed by winding a flat copper thin film wire in its radial direction. Therefore, the coils CL1-1 to CL1-4 formed by winding thin copper wires are overlapped with the film BF1 interposed therebetween so that the winding centers of the coils CL1-1 to CL1-4 are aligned. As a result, the parasitic capacitance between the coils can be increased, and the resonance frequency can be lowered.

In the above-described first embodiment, the case where each coil CL1-1 and the like is wound counterclockwise has been described. However, other than this, it is also possible to apply the present invention to a configuration of a power transmitting coil or a power receiving coil in which each coil is wound clockwise and stacked.

Further, in the above-described first embodiment, the case where each of the power transmitting coil TC1 and the power receiving coil RC1 includes the coil CL1-1 and the like has been described. CL1-1 and the like may be provided. Even in this case, the same effect as the power transmission system S1 of the first embodiment can be obtained.

(b) Second embodiment
Next, a second embodiment of the invention will be described with reference to FIGS. 9 to 13. FIG.
(I) Overall configuration and operation of power transmission system
Since the overall configuration and operation of the power transmission system of the second embodiment are basically the same as the overall configuration and operation of the power transmission system S of the first embodiment, detailed description thereof will be omitted.

(II) Configuration of Power Transmission Coil (Power Reception Coil) Next, the configuration of the power transmission coil and the power reception coil of the second embodiment, which are used in the power transmission system of the second embodiment, will be described with reference to FIGS. 9 to 11. explain. Since the power transmitting coil TC and the power receiving coil RC of the embodiment basically have the same configuration, the power transmitting coil TC will be described below. 9 and 10 are plan views respectively showing the structure of the power transmission coil of the second embodiment, and FIG. 11 is a partial cross-sectional view showing the structure of the power transmission coil of the second embodiment.

As shown in the plan view of FIG. 9, in the power transmission coil TC of the second embodiment, two coils CL2-1 and CL2-2, which will be described later, are arranged on the page of FIG. It is configured by being laminated in the direction. Although the film BF2 is used for insulation between the coil CL2-1 and the coil CL2-2 in the second embodiment, an insulating material such as a glass epoxy material can also be used. . Further, in order to efficiently dissipate the heat generated by the power transmission coil of the second embodiment, for example, ceramic particles or the like may be dispersed to use a thin film material. Here, the winding centers of the copper thin film wires, which will be described later, constituting the coil CL2-1 and the coil CL2-2, respectively, are the same or substantially the same.

As shown in the plan view of FIG. 9, the coil CL2-1 constituting the power transmission coil of the second embodiment has a connection terminal O2-1 for external connection on its outermost periphery. The coil CL2-1 is configured by, for example, a copper thin film wire spirally wound three and a half turns counterclockwise starting from the connection terminal O2-1, from the outermost circumference toward the innermost circumference. It is A via V2 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL2-2 which is laminated directly under it in FIG. The copper thin film wire forming the coil CL2-1 has the same width and thickness over the entire circumference of the coil CL2-1. Furthermore, in the coil CL2-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

Next, the configuration of the coil CL2-2 laminated directly below the coil CL2-2 via the film BF2 will be described with reference to FIG. FIG. 10 is a plan view showing only the coil CL2-2.

As shown in FIG. 10, the coil CL2-2 that constitutes the power transmission coil of the second embodiment is connected to the via V2 for forming an electrical connection with the coil CL2-1 at its innermost circumference. It is That is, the connection between the coil CL2-1 and the coil CL2-2 is a series connection. Then, the coil CL2-2 rotates clockwise (that is, in the direction opposite to the coil CL2-1) starting from the via V2, from its innermost periphery to its outermost periphery, similarly to the coil CL2-1, for example A copper thin film wire is spirally wound three and a half turns. It also has a connection terminal O2-2 for external connection on its outermost periphery. The copper thin film wire forming the coil CL2-2 has the same width and thickness over the entire circumference of the coil CL2-2, like the coil CL2-1. Further, in the coil CL2-2, as in the coil CL2-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the positional relationship between the copper thin film wires constituting the coil CL2-1 and the coil CL2-2, respectively, is the position of the copper thin film wire of the coil CL2-1 wound counterclockwise, The position of the copper thin film wire of the coil CL2-2 wound in the clockwise direction is aligned with the position of the copper thin film wire of the coil CL2-1 and the coil CL2-2 when viewed from the winding center of each of the coils CL2-1 and CL2-2. Wire is wound. The coil CL2-1 and the coil CL2-2 are connected by a via V2 connected to the innermost circumference of each. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL2-1 is reversed (turned back) at the innermost peripheral portion in the opposite direction, so that the coil CL2-2 is turned from the innermost peripheral portion to the outermost peripheral portion. is wound to

Next, the state of connection between the coil CL2-1 and the coil CL2-2 will be described with reference to FIG. 11 as a cross-sectional view taken along the line A-A' shown in FIG.

As shown in FIG. 11, on the left side of FIGS. 9 and 10, the coil CL2-1 and the coil CL2-2 are stacked with the film BF2 interposed therebetween, and are electrically connected to each other by vias V2. . At the position of the via V2, the counterclockwise winding of the coil CL2-1 is cut back (folded back) to form the clockwise winding of the coil CL2-2.

(III) Method for manufacturing the power transmitting coil and the power receiving coil of the second embodiment
Next, a method for manufacturing the power transmitting coil and the power receiving coil of the second embodiment will be described.

As the manufacturing method, basically the same as the conventional method, the first manufacturing method including the following steps (a)-1 to (a)-6, or the following (b)-1 to (b)-9 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Form a copper thin film on both sides of the film BF2 (a)-2: Apply a resist on each of the copper thin films (both sides) formed in (a)-1 above (a)-3: Patterning the applied resist on the copper thin film wires of the coil CL2-1 and the coil CL2-2 (a)-4: Etching is performed after the above patterning to form the copper thin film wires as the coil CL2-1 and the coil CL2-2 ( a)-5: Form the via V2. case) and connection (b) second manufacturing method
(b)-1: Copper thin films are formed on both sides of the film BF2. (b)-2: Through holes are formed at positions corresponding to the vias V2 by using a laser or the like. Electrolytic copper plating and electrolytic copper plating are applied to form vias V2 (b)-4: A resist is applied to each of the copper plating (both sides) formed in (b)-3 above (b )-5: The applied resist is patterned on the copper thin film wires of the coil CL2-1 and the coil CL2-2. Form a line (b)-7: Connection between connection terminal O2-1 and connection terminal O2-2 and power transmission unit TR (in the case of power transmission device T) or power reception unit RV (in the case of power reception device R)

(IV) Second embodiment
Next, based on the results of experiments conducted by the inventors of the present application, the effect of performing power transmission using the power transmission system of the second embodiment including the power transmission coil and the power reception coil of the second embodiment will be described with reference to FIGS. Description will be made with reference to FIG. Note that in the following description, the effect of performing power transmission using the power transmission system of the second embodiment will be compared with the effect of performing power transmission using the power transmission system of the conventional example. do. As a conventional example in the case described below, a power transmitting coil and a power receiving coil each composed of a coil having a six-turn structure in one layer are connected to the outside by a lead wire extending from the innermost coil end to the coil itself. A power transmission system including a power transmission coil and a power reception coil having a structure for performing Also, FIG. 13 shows the leakage magnetic field when power of 1 watt is input to the power transmitting coil or the power receiving coil of the second embodiment. Furthermore, the horizontal axis of FIG. 13 indicates the distance relative to the center of the coil CL1 and the coil CL2, and the vertical axis indicates the leakage magnetic field when 1 microampere/meter is 0 decibel.

First, as shown in FIG. 12A, when the power transmitting coil and power receiving coil of the second embodiment are used, the S parameter (S11) is extremely small near the self-resonant frequency of 60 megahertz. That is, at the self-resonant frequency, the reflection from the power transmitting coil and the power receiving coil of the second embodiment is small, so that the power supplied to the power transmitting coil (that is, the input power to the power transmitting coil - the power reflected at the power transmitting coil power) divided by the input power (supplied power/input power) is extremely high. On the other hand, as shown in FIG. 12B, the coil in the conventional power transmission system has a large S-parameter around 30 MHz, which is its self-resonance frequency. This therefore indicates that the reflection seen from the input side of the coil is large (ie, the incidence rate and the efficiency of the power transfer system as a whole are low).

On the other hand, when comparing the power transmitting coil and the power receiving coil of the second embodiment with the coil in the power transmission system of the conventional example from the viewpoint of leakage electromagnetic field, as shown in FIG. When viewed from the center position, the leakage electromagnetic field (leakage magnetic flux) by the power transmission coil and the power reception coil of the second embodiment is suppressed to be lower than the leakage electromagnetic field by the coil in the power transmission system of the conventional example. This is because, in the power transmitting coil and the power receiving coil of the second embodiment, currents in opposite directions flow through the copper thin-film wires of the coil CL2-1 and the coil CL2-2, which are stacked at the same position with the film BF2 interposed therebetween. Therefore, the direction of the leakage electromagnetic field (leakage magnetic flux) generated by them becomes the center direction of each of the coils CL2-1 and CL2-2, and as a result, the leakage electromagnetic field to the outside is suppressed. Conceivable. This fact has also been confirmed by the inventor of the present invention through a three-dimensional simulation of leakage magnetic flux.

12 and 13, although the current flowing through the coil in the conventional power transmission system is smaller, when compared at the same position viewed from the center of the winding of the coil, , the leakage electromagnetic field (leakage magnetic flux) in the power transmitting coil and the power receiving coil of the second embodiment is suppressed to a considerably low level.

As described above, according to power transmission using the power transmission system of the second embodiment including the power transmission coil and the power reception coil of the second embodiment, each copper thin film wire forming the winding of the coil CL2-1 The coil CL2-1 and the coil CL2-2 are arranged such that the radial position of the coil CL2-1 and the coil CL2-2 coincide with or substantially coincide with the radial position of each copper thin film wire that constitutes the winding of the coil CL2-2. The innermost peripheral end of the coil CL2-1 and the innermost peripheral end of the coil CL2-2 wound in the opposite direction (opposite winding direction) to the coil CL2-1 are overlapped, and the via is formed. The outermost peripheral end of coil CL2-1 is used as connection terminal O2-1, and the outermost peripheral end of coil CL2-2 is used as connection terminal O2-2. Therefore, when non-contact power transmission is performed with the power transmitting coil and the power receiving coil of the second embodiment facing each other, the leakage electromagnetic field to the outside can be reduced, and the reflection at the resonance frequency is suppressed to increase the transmission efficiency. be able to. In addition, since the outermost peripheral end of the coil CL2-1 and the outermost peripheral end of the coil CL2-2 are used as the connection terminal O2-1 and the connection terminal O2-2, the connection terminal straddles the copper thin film wire. It is not necessary to pull out the terminal, and the leakage electromagnetic field due to the straddling can be reduced. Furthermore, the resonance frequency of the coil can be reduced due to the parasitic capacitance between the coil CL2-1 and the coil CL2-2. It can be shortened, and power loss and heat generation due to its electrical resistance can be suppressed.

In addition, since each of the coil CL2-1 and the coil CL2-2 is formed by winding a copper thin film wire that is flat in its radial direction, the coil diameter of the copper thin film wire of each of the coil CL2-1 and the coil CL2-2 is By sandwiching the film BF so that the positions of the directions match, the parasitic capacitance between the coil CL2-1 and the coil CL2-2 is increased to further reduce the resonance frequency of the coil. can be done.

In the second embodiment described above, the case where the coil CL2-1 is wound counterclockwise and the coil CL2-2 is wound clockwise has been described. However, in addition to this, the present invention can be applied to a configuration of a power transmitting coil or a power receiving coil in which the coil CL2-1 is wound clockwise and the coil CL2-2 is wound counterclockwise and laminated. is also possible.

Further, in the second embodiment described above, the case where each of the power transmitting coil and the power receiving coil of the second embodiment includes the coil CL2-1 and the coil CL2-2 has been described. may include the coil CL2-1 and the coil CL2-2. Even in this case, the same effect as the power transmission system of the second embodiment can be obtained.

(c) Third embodiment
Next, a third embodiment of the invention will be described with reference to FIGS. 14 to 22. FIG.

Here, the power transmission system by the magnetic field resonance method of the third embodiment and each modification corresponding thereto is arranged to face (that is, face) a power transmission coil that is separated from the power transmission coil. and a power receiving coil that receives power sent from the power transmitting coil. The power transmission coil is configured by stacking a power transmission loop coil, which will be described later, and a power transmission open coil, which will be described later. The power receiving coil is configured by laminating a power receiving open coil, which will be described later, and a power receiving loop coil, which will be described later.

(I) About the overall configuration and operation of the power transmission system of the third embodiment
First, the overall configuration and operation of the power transmission system of the third embodiment will be described using FIG. Note that FIG. 14 is a block diagram showing a schematic configuration of the power transmission system of the third embodiment.

As shown in FIG. 14, the power transmission system S3 of the third embodiment includes a power receiving device R including a power receiving unit RV and the power receiving coil RC, a power transmitting device T including a power transmitting unit TR and the power transmitting coil TC, It is composed of

The power transmission coil TC includes a power transmission loop coil TL and a power transmission open coil TO. The power receiving coil RC includes a power receiving open coil RO and a power receiving loop coil RL. At this time, the power to be transmitted is input from the power transmission unit TR to the power transmission loop coil TL. The power transmission open coil TO is laminated concentrically with the power transmission loop coil TL, and both ends thereof are open. On the other hand, the power receiving open coil RO is arranged to face the power transmitting open coil TO and has open ends. The power receiving loop coil RL is concentrically laminated with respect to the power receiving open coil RO, and outputs power received from the power transmitting coil TC to the power receiving unit RV via the power receiving open coil RO by the magnetic resonance method. At this time, the power transmitting coil TC or the power receiving coil RC corresponds to an example of the "coil pair" of the present invention.

(II) Configuration of power transmitting coil TC (power receiving coil RC)
Next, configurations of the power transmission coil TC and the power reception coil RC of the third embodiment, which are used in the power transmission system S3 of the third embodiment described above, will be described with reference to FIGS. 15 to 20. FIG. Note that the power transmitting coil TC and the power receiving coil RC of the third embodiment basically have the same configuration. That is, the configuration of the power transmission loop coil TL and the configuration of the power reception loop coil RL are basically the same. Further, the configuration of the power transmission open coil TO and the configuration of the power reception open coil RO are basically the same. Further, the positional relationship within the power transmitting coil TC between the power transmitting loop coil TL and the power transmitting open coil TO, and the positional relationship within the power receiving coil RC between the power receiving loop coil RL and the power receiving open coil RO are basically are identical. Therefore, in the following description, the structure of the power transmitting coil TC will be described. 15 to 19 are plan views showing the structure of the power transmission coil TC of the third embodiment, and FIG. 20 is a partial cross-sectional view showing the structure of the power transmission coil TC of the third embodiment. 15 to 20 are plan views of the power transmission device T when the power transmission coil TC is viewed from the power transmission unit TR side.

As shown in the plan view of FIG. 15, in the power transmission coil TC of the third embodiment, the power transmission loop coil TL and the power transmission open coil TO not shown in FIG. (to be described later) are stacked in the paper surface direction of FIG. The power transmission open coil TO is configured by laminating two coils CL3-1 and CL3-2, which will be described later, in the paper plane direction of FIG. be done. In addition to the insulating film BF3-1 and film BF3-2, it is also possible to use an insulating material such as a glass epoxy material or, for example, a thin film material in which ceramic particles or the like are dispersed. Alternatively, it is the same as the first embodiment or the second embodiment that it may be configured to be laminated with a necessary gap by using an appropriate gap holding material, and a fourth embodiment to be described later. The same applies to the modes to the ninth embodiment. In addition, the winding centers of the copper thin film wires, which will be described later, constituting the power transmission loop coil TL, the coil CL3-1, and the coil CL3-2, respectively, are the same or substantially the same.

As shown in FIG. 15, the power transmission loop coil TL has a connection terminal O3-1 and a connection terminal O3-2 connected to the power transmission section TR on one side of the outermost peripheral portion thereof. The power transmission loop coil TL is formed by, for example, winding a copper thin film wire one turn (one turn). and the connection terminal O3-2. The copper thin-film wire forming the power transmission loop coil TL has the same width and the same thickness over the entire circumference of the power transmission loop coil TL. Furthermore, in the power transmission loop coil TL, straight portions are provided on each of the upper, lower, left, and right sides in FIG. 15, and the straight portions are connected by curved portions.

Next, the configuration of the coil CL3-1 constituting the power transmission open coil TO, which is laminated directly below the power transmission loop coil TL via the film BF3-1, will be described with reference to FIG. FIG. 16 is a plan view showing only the coil CL3-1.

As shown in FIG. 16, the coil CL3-1 forming the power transmission open coil TO has an open end T3-1 at its outermost periphery. The coil CL3-1 is rotated counterclockwise starting from the open end T3-1, from the outermost peripheral portion to the innermost peripheral portion, for example, a copper thin film wire spirally turns seven and a half turns (7.5 turns). It is configured by winding. A via V3 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL3-2 which is laminated directly under it in the paper surface direction of FIG. The copper thin film wire forming the coil CL3-1 has the same thickness over the entire circumference of the coil CL3-1. On the other hand, as shown in FIG. 3, the width of the copper thin film wire increases from the open end T3-1 at the outermost peripheral end of the coil CL3-1 to the portion connected to the via V3 at the innermost peripheral end. ing. In this coil CL3-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is The width of the copper thin film wire that constitutes the coil CL3-1 is constant at each straight line portion, but widens toward the innermost peripheral end at each curved line portion connecting them. At this time, the width of the copper thin film wire that constitutes the coil CL3-1 should be widened from the outermost peripheral end to the innermost peripheral end of the coil CL3-1 as a whole. Even if it is temporarily (partially) narrowed toward the innermost peripheral edge, there is no effect on the effect of power transmission using the power transmission system S3 of the third embodiment.

Next, the configuration of the coil CL3-2 laminated directly below the coil CL3-1 via the film BF3-2 will be described with reference to FIG. FIG. 17 is a plan view showing only the coil CL3-2.

As shown in FIG. 17, the coil CL3-2, which together with the coil CL3-1 constitutes the power transmitting open coil TO, has the via for forming an electrical connection with the coil CL3-1 at its innermost circumference. V3 is connected. That is, the coil CL3-1 and the coil CL3-2 are connected in series. Then, the coil CL3-2 starts from the via V3 in the counterclockwise direction (that is, in the same direction as the coil CL3-1), from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirally. It is wound seven and a half turns (7.5 turns). Further, the outermost peripheral portion thereof is defined as an open end T3-2. The copper thin film wire forming the coil CL3-2 has the same thickness over the entire circumference of the coil CL3-2. On the other hand, as shown in FIG. 17, the width of the copper thin film wire increases from the open end T3-2 at the outermost peripheral end of the coil CL3-2 to the portion connected to the via V3 at the innermost peripheral end. ing. Similar to the coil CL3-1, the coil CL3-2 has straight lines parallel to each other on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve. The width of the copper thin film wire that constitutes the coil CL3-2 is constant at each straight line portion, but widens toward the innermost peripheral end at each curved line portion connecting them. At this time, the width of the copper thin film wire forming the coil CL3-2 is the same as the width of the copper thin film wire forming the coil CL3-1, and the coil CL3-2 as a whole has a width from the outermost end to the innermost end. However, it may be temporarily (partially) narrowed from the outermost peripheral end to the innermost peripheral end.

Here, as for the positional relationship between the copper thin-film wires constituting the coil CL3-1 and the coil CL3-2, respectively, the copper of the coil CL3-1 and the coil CL3-2 wound counterclockwise is The copper thin-film wires are wound such that the positions of the thin-film wires of the coils CL3-1 and CL3-2 substantially coincide when viewed from the winding center of each. The coil CL3-1 and the coil CL3-2 are connected in series by the via V3 connected to the innermost circumference of each. As a result, the coil CL3-2 is connected at the innermost circumference in the same winding direction as the coil CL3-1 is wound from the outermost circumference to the innermost circumference, and the winding direction is maintained. As it is, the coil CL3-2 is wound from the innermost peripheral portion to the outermost peripheral portion. Due to this structure, in the power transmission open coil TO of the third embodiment, a current flows counterclockwise from the outermost circumference to the innermost circumference in the coil CL3-1, and the current flows to the maximum in the coil CL3-2. It flows in the same counterclockwise direction from the inner peripheral portion to the outermost peripheral portion.

Next, the positional relationship between the copper thin-film wires respectively constituting the power transmission loop coil TL and the power transmission open coil TO (that is, the coil CL3-1 and the coil CL3-2) will be described with reference to FIGS. 18 and 19. do. Note that FIG. 18 is a plan view showing the overlapping state of the power transmission loop coil TL and the coil CL3-1. The coils CL3-1 of the power transmission open coil TO stacked via the coils CL3-1 are indicated by dashed lines. Also, FIG. 19 is a plan view showing the overlapping state of the coil CL3-1 and the coil CL3-2 of the power transmission open coil TO. (illustration is omitted in )) are indicated by dashed lines.

As shown by the dashed line in FIG. 18, the coil CL3-1 wound from the outer circumference to the inner circumference and connected to the coil CL3-2 by the via V3 at the innermost circumference has Then, the thin copper wire is wound with curved portions so that the positions of the straight portions are deviated inwardly by a quarter of the winding pitch of the thin copper wire. On the other hand, as shown by the solid line in FIG. 18, the power transmission loop coil TL is laminated along the outer edge of the coil CL3-1, and the connection terminal O3-1 and the connection terminal O3-2 protrude outside the winding. It is considered to be a shape that

Next, as indicated by the dashed line in FIG. 19, the coil CL3-2 wound from the inner circumference to the outer circumference and connected to the coil CL3-1 by the via V3 at the innermost circumference has a quarter of the coil CL3-2. Each round, the thin copper wire is wound with curved portions so that the position of the straight portion is shifted to the outer peripheral side by a quarter of the winding pitch of the thin copper wire. On the other hand, as shown by the solid line in FIG. 19, the coil CL3-1 is laminated so as to be at approximately the same position as the coil CL3-2, and the open end T3-1 and the open end T3-2 are outside the winding. formed.

As shown in FIGS. 18 and 19 above, in the power transmission coil TC in which the power transmission loop coil TL and the coils CL3-1 and CL3-2 of the power transmission open coil TO are stacked, the power transmission Each copper thin film wire constituting the loop coil TL and the power transmission open coil TO (the coil CL3-1 and the coil CL3-2) are laminated so as to overlap each other.

Next, the lamination state of the power transmission loop coil TL, the coils CL3-1 and CL3-2, and the connection state of the coils CL3-1 and CL3-2 are shown in FIGS. Description will be made with reference to FIG. 20 as a partial cross-sectional view.

As shown in FIG. 20, on the left side of FIGS. 15 to 19, a coil CL3-1 and a coil CL3-2 are laminated with a film BF3-2 interposed therebetween, and electrically connected to each other by a via V3. ing. From the position of the via V3, the counterclockwise winding of the coil CL3-2 is formed in the same winding direction as the counterclockwise winding of the coil CL3-1. On the other hand, the power transmission open coil TO composed of the coil CL3-1 and the coil CL3-2 and the power transmission loop coil TL are laminated with the fill portion BF3-1 (see FIG. 15) interposed therebetween.

(III) Manufacturing method of power transmitting coil TC and power receiving coil RC
Next, a method of manufacturing the power transmitting coil TC and the power receiving coil RC of the third embodiment will be described.

As the manufacturing method, basically the same as the conventional method, the first manufacturing method including the following steps (a)-1 to (a)-11, or the following (b)-1 to (b)-12 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Form a copper thin film on both sides of the film BF3-2 (a)-2: Apply a resist on each of the copper thin films (both sides) formed in (a)-1 above (a)- 3: The resist applied in (a)-2 above is patterned on the copper thin film wires of the coil CL3-1 and the coil CL3-2 on each surface (at this time, the coil CL3-1 (coil CL3- 2), as described above, the width of the copper thin film wire that constitutes the It is patterned so as to widen to the part where the via V3 is connected at the end.)
(a)-4: After the patterning of (a)-3 above, an etching process is performed to form copper thin film wires as the coil CL3-1 and the coil CL3-2. (a)-5: The via V3 is formed to transmit electricity. Let open coil TO.
(a)-6: Form a copper thin film on the entire one side of the film BF3-1 (a)-7: Apply a resist on the copper thin film formed in (a)-6 above (a)-8: Above ( a) Patterning the resist applied in-7 to the thin copper wire of the power transmission loop coil TL (a)-9: Etching is performed after the patterning of (a)-8 above to form a copper thin film wire as the power transmission loop coil TL. (a)-10: The power transmission open coil TO of (a)-5 above and the power transmission loop coil TL of (a)-9 above are bonded together to form a power transmission coil TC (a)-11: Connection terminal (b) second manufacturing method
(b)-1: Copper thin films are formed on both sides of the film BF3-2. (b)-2: Through-holes are formed at positions corresponding to vias V3 by laser or the like. copper plating by electroless copper plating and electrolytic copper plating to form vias V3 (b)-4: Resist is applied to the copper plating (both sides) formed in (b)-3 above. (b)-5: The resist applied in (b)-4 above is patterned on the copper thin film wires of the coil CL3-1 and the coil CL3-2 (at this time, the coil CL3-1 of the third embodiment (coil CL3-2 ) is, as described above, the width of the open end T3-1 (open end T3-2) at the outermost end of the coil CL3-1 (coil CL3-2) to the innermost end patterned so as to widen to the part where the via V3 is connected in the part.)
(b)-6: After the patterning of (b)-5 above, an etching process is performed to form copper thin film wires as the coil CL3-1 and the coil CL3-2 to form the power transmission open coil TO.
(b)-7: Form a copper thin film on the entire one side of the film BF3-1 (b)-8: Apply a resist on the copper thin film formed in (b)-7 above (b)-9: Above ( b) Patterning the resist applied in -8 to the copper thin film wire of the power transmission loop coil TL (b) -10: Etching is performed after the patterning of (b) -9 above to form a copper thin film wire as the power transmission loop coil TL. (b)-11: The power transmission open coil TO of (b)-6 above and the power transmission loop coil TL of (b)-10 above are bonded together to form a power transmission coil TC. (b)-12: Connection terminal O3-1 and connection terminal O3-2 are connected to the power transmission unit TR (in the case of the power transmission device T) or the power reception unit RV (in the case of the power reception device R)

(IV) Third embodiment
Next, experimental results (simulation results) by the inventors of the present application with respect to the effect of performing power transmission using the power transmission system S3 of the third embodiment including the power transmission coil TC and the power reception coil RC of the third embodiment. will be described with reference to FIGS. 21 and 22. FIG. FIG. 21 is a diagram showing the effects and the like of the coil structure of the third embodiment, and FIG. 22 is a diagram showing the S parameter-frequency relationship as the effect. Further, in the following description, the simulation result of the effect when power transmission is performed using the power transmission system S3 of the third embodiment is compared with the simulation result of the effect when power transmission is performed using the power transmission system of the conventional example. This will be explained while comparing the results. Furthermore, in the above experiments, a power transmission system including a power transmission coil and a power reception coil having the same configuration was used for each of the examples and the comparative examples, and the power transmission coil and the power reception coil were opposed to each other with a distance of 37.5 mm. The experiment was conducted after In addition, in the second example and the second comparative example for which the experimental results shown in FIG. 22 were obtained, a copper wire with a circular cross section was used instead of the copper thin film wire in the power transmission coil TC according to the third embodiment.

Here, the specifications in the experiments whose results are shown in FIGS. 21 and 22 are shown below. In the following description, the specifications of the power transmission coil are described, but the specifications of the power reception coil used in the experiment are also the same.

(1) Specifications of the power transmission coil TC whose experimental results are shown as the 3-1 embodiment (see FIG. 21)
・Overall size and shape: approximately square with one side of 150 mm ・Number of turns of power transmission loop coil TL: 1 (see FIGS. 2 and 5)
- Copper thin film line width in the transmission loop coil TL: 3 mm - Number of turns of coil CL3-1 and coil CL3-2: 7.5 (see FIGS. 16 to 19)
・Copper thin film line width in coil CL3-1 and coil CL3-2: 2.0 mm at the outermost periphery, 6.5 mm at the innermost periphery ・Power transmission loop coil TL and coil CL3-1 and coil CL3-2 respectively Copper thin film wire thickness in: 0.2mm

(2) Specifications of the power transmission coil whose experimental results are shown as the 3-1 comparative example (see Fig. 21)
・Overall size and shape: approximately square with a side of 150 mm ・Transmission open coil has a structure with only one coil in which a copper thin film wire is wound 15.5 times (15.5 turns) ・One coil Copper thin film line width in: 1.0 mm at the outermost circumference, 3.2 mm at the innermost circumference (half width of coil CL3-1 and coil CL3-2 in the third embodiment)
The shape of the power transmitting loop coil is the same as that of the power transmitting loop coil TL of the third embodiment. The structure of the power receiving coil of Comparative Example 3-1 is the same as that of the power transmitting coil of Comparative Example 3-1.

(3) Specifications of the power transmission coil TC whose experimental results are shown as the 3-2 embodiment (see FIG. 22)
・ Overall size and shape: approximately square with one side of 75 mm ・ Number of turns of power transmission loop coil TL: 1
・Copper wire diameter in transmission loop coil TL: 1.5 mm ・Number of turns of coil CL3-1 and coil CL3-2: 5.5
・Copper thin wire diameter in coil CL3-1 and coil CL3-2: 1.5 mm

(4) Specifications of the power transmission coil whose experimental results are shown as a 3-2 comparative example (see Fig. 22)
・Overall size and shape: approximately square with one side of 75 mm ・Transmission open coil is a structure with only one coil in which copper wire is wound 5.5 times (5.5 turns) ・One coil can be placed Copper wire diameter: 1.5mm,
- The shape of the power transmitting loop coil is the same as that of the power transmitting loop coil TL of the third embodiment. The structure of the power receiving coil of the 3-2 comparative example is the same as that of the power transmitting coil of the second comparative example.

Then, as shown in FIG. 21, the resonance frequency of the power transmitting coil and the power receiving coil in Comparative Example 3-1 is about 9.6 MHz, whereas the power transmitting coil TC and power receiving coil RC in Example 3-1 is about 1.0 megahertz, and as a result, the resonance frequency in the power transmission system S3 of the third embodiment is about one tenth of the resonance frequency in the power transmission system of the 3-1 comparative example. I was able to

Further, as shown in FIG. 22, the resonance frequency of the power transmitting coil and the power receiving coil in Comparative Example 3-2 is about 85 MHz, whereas the resonance frequency of the power transmitting coil TC and the power receiving coil RC in Example 3-2 is about 85 MHz. The frequency is about 19 megahertz, and as a result, the resonance frequency in the power transmission system S3 of the third embodiment is set to about 1/4 of the resonance frequency in the power transmission system of the 3-2 comparative example. was made.

As described above, according to the power transmission using the power transmission system S3 of the third embodiment including the power transmission coil TC and the power reception coil RC of the third embodiment, both the power transmission loop coil TL (the power reception loop coil RL) and In the power transmitting open coil TO (power receiving open coil RO) constituting the power transmitting coil TC (power receiving coil RC), the winding direction of the copper thin film wire of the coil CL3-1 and the winding direction of the copper thin film wire of the coil CL3-2 16, 17 and 19), the coil CL3-1 and the coil CL3-2 are wound on different planes, and the center of the winding of the coil CL3-1 and the coil CL3 The coil CL3-1 and the coil CL3-2 are overlapped so that the winding center of the coil CL3-1 and the coil CL3-2 are aligned with each other, and the outermost peripheral ends of the coils CL3-1 and CL3-2 are the open ends T3-1. and an open end T3-2. Therefore, when the power transmission coil TC and the power reception coil RC are opposed to each other to perform contactless power transmission, the resonance frequency of the power transmission coil TC (power reception coil RC) can be effectively reduced. When adjusting the frequency, the length of each copper thin film wire can be shortened, and power loss and heat generation due to the electrical resistance of the copper thin film wire can be suppressed.

Further, since the innermost peripheral portion of the coil CL3-1 and the innermost peripheral portion of the coil CL3-2 are connected by the via V3, the transmission efficiency of the power transmitting coil TC (power receiving coil RC) is improved, and the The resonance frequency can be effectively reduced.

Furthermore, since each of the coil CL3-1 and the coil CL3-2 is formed by winding a copper thin film wire that is flat in its radial direction, the coil CL3-1 and the coil CL3-1 formed by winding the copper thin film wire By overlapping the coils CL3-1 and CL3-2 so that the centers of the windings of the coils CL3-2 coincide with each other, the parasitic capacitance between the coils CL3-1 and CL3-2 is increased to transmit power. The resonance frequency of the coil TC (receiving coil RC) can be further lowered.

(V) Third Modification
Next, a modification of the third embodiment of the invention will be described. The configuration of the power transmission system S3 of the third embodiment described above may be modified as shown in (A) to (I) below. The inventors of the present invention have confirmed that the same effects as those of the power transmission system S3 can be obtained even if each modification is added.

(A) 3-1 Modification First, as a 3-1 modification, for example, in the power transmission open coil TO (or power reception open coil RO) of the third embodiment, the coil CL3-1 and the coil CL3- 2. The number of turns of each of the coils CL3-1 and CL3-2 is seven and a half turns (7.5 turns). The number of turns may differ from the number of turns of coil CL3-2.

(B) 3-2 variant
Next, as a 3-2 modification, in the power transmitting open coil TO (or power receiving open coil RO) of the third embodiment, for example, the power transmitting loop coil TL (or power receiving loop coil RL) and the coil CL3-1 are arranged in different layers. However, they may be formed in the same layer, and the power transmitting loop coil TL (or power receiving loop coil RL) and the coil CL3-1 may be concentrically stacked.

(C) 3-3 modified form
Next, as a 3-3 modification, the coil CL3-1 and the coil CL3-2 of the third embodiment were connected by the via V3 at their innermost peripheral portions. 1 and the coil CL3-2 may be insulated from each other.

(D) 3rd-4th variant
Next, as a 3-4 modification, the order of the coil CL3-1 and the coil CL3-2 of the third embodiment viewed from the power transmitting loop coil TL (or the power receiving loop coil RL) of the third embodiment is reversed. good too.

(E) 3rd-5th variant
Next, as a third-fifth modification, the position of the power transmitting loop coil TL and the position of the power transmitting open coil TO in the power transmitting coil TC of the third embodiment are exchanged, and the power receiving loop coil in the power receiving coil RC of the third embodiment The position of RL and the position of power receiving open coil RO may be interchanged. In the case of the 3-5 modification, in the power transmission system of the 3-5 modification as a whole, the power transmission loop coil TL of the power transmission coil and the power reception loop coil RL of the power reception coil are arranged to face each other. become.

(F) 3rd-6th variant
Next, as a 3-6 modification, the coil CL3-1 and the coil CL3-2 of the third embodiment are configured so that their widths are widened from the outer circumference to the inner circumference, but in addition to these, the coil CL3 -1 and the width of the coil CL3-2 may be the same over the entire circumference.

(G) 3rd-7th variant
Next, as a 3-7 modification, the power transmission open coil TO (power reception open coil RO) of the third embodiment has a two-layer laminated structure of the coil CL3-1 and the coil CL3-2, but the winding direction is A power transmitting open coil (power receiving open coil) may be configured by stacking the same four coils. In this case, for the first coil, the copper thin film wire is wound counterclockwise from the outermost circumference to the innermost circumference, and is connected to the second coil at the innermost circumference. A copper thin film wire is wound counterclockwise from the innermost peripheral portion connected to the first coil to the outermost peripheral portion, and the outermost peripheral portion is connected to the third coil. Furthermore, for the third coil, the copper thin film wire is wound counterclockwise from the outermost circumference to the innermost circumference, and is connected to the fourth coil at the innermost circumference. A copper thin film wire is wound counterclockwise from the innermost peripheral portion connected to the coil No. 3 to the outermost peripheral portion. Further, it is preferable that the outermost peripheral end portion of the first coil and the outermost peripheral end portion of the fourth coil are respectively configured as open ends.

(H) 3rd-8th variant
Next, as a 3-8 modification, in the above-described third embodiment, in the power transmission open coil TO (power reception open coil RO), the radial position of each turn of the coil CL3-1 and each turn of the coil CL3-2 Although the positions of the turns in the radial direction are configured to match (see FIGS. 16, 17 and 19), this is not limiting, and even if the positions of the turns in the radial direction are different, the coil CL3 -1 and the coil CL3-2 are laminated, it is possible to adjust the desired parasitic capacitance, and the same effect as that of the power transmission system S of the third embodiment can be obtained.

(I) 3rd-9th variant
Finally, as a third-ninth modification, in the third embodiment, in series or parallel with the end of the open end of the power transmission open coil TO or the power reception open coil TO, or the power transmission loop coil TL or the power reception loop Capacitors are further connected in parallel with the coil RL to lower the resonance frequency of the power transmitting loop coil TO or the power receiving loop coil RO, or the power transmitting open coil TL or the power receiving open coil RL. may

(d) Fourth embodiment
Next, a fourth embodiment of the invention will be described with reference to FIGS. 23 to 30. FIG.
(I) Overall configuration and operation of power transmission system
Since the overall configuration and operation of the power transmission system of the fourth embodiment are basically the same as the overall configuration and operation of the power transmission system S3 of the third embodiment, detailed description thereof will be omitted. At this time, the power transmitting loop coil TL and the power receiving loop coil RL correspond to an example of the "second coil" of the present invention, and the power transmitting open coil TO and the power receiving open coil RO correspond to an example of the "first coil" of the present invention. .

(II) Configuration of power transmitting coil (power receiving coil) of the fourth embodiment
Next, configurations of the power transmission coil and the power reception coil of the fourth embodiment, which are used in the power transmission system of the fourth embodiment described above, will be described with reference to FIGS. 23 to 27. FIG. Note that the power transmitting coil and the power receiving coil of the fourth embodiment basically have the same configuration. That is, the configuration of the power transmitting loop coil of the fourth embodiment and the configuration of the power receiving loop coil of the fourth embodiment are basically the same. Also, the configuration of the power transmission open coil of the fourth embodiment and the configuration of the power reception open coil of the fourth embodiment are basically the same. Furthermore, the positional relationship in the power transmission coil of the fourth embodiment between the power transmission loop coil of the fourth embodiment and the power transmission open coil of the fourth embodiment, the power reception loop coil of the fourth embodiment and the power reception open coil of the fourth embodiment The positional relationship within the power receiving coil of the fourth embodiment with the coil is also basically the same. Therefore, in the following description, the structure of the power transmission coil of the fourth embodiment will be described. 23 to 26 are plan views respectively showing the structure of the power transmission coil of the fourth embodiment, and FIG. 27 is a partial cross-sectional view showing the structure of the power transmission coil of the fourth embodiment. 23 to 26 are plan views of the power transmission coil of the fourth embodiment viewed from the power transmission section side of the fourth embodiment in the power transmission device of the fourth embodiment.

As shown in the plan view of FIG. 23, in the power transmission coil of the fourth embodiment, the power transmission loop coil TL4 of the fourth embodiment and the power transmission open coil of the fourth embodiment not shown in FIG. 23 through the film BF4-1. Further, the power transmission open coil of the fourth embodiment is configured by laminating two coils CL4-1 and CL4-2, which will be described later, with an insulating film BF4-2 interposed therebetween. In addition, the winding centers of the copper thin film wires, which will be described later and which respectively constitute the power transmission loop coil TL4, the coil CL4-1, and the coil CL4-2, are the same or substantially the same.

As shown in FIG. 23, the power transmission loop coil TL4 has a connection terminal O4-1 and a connection terminal O4-2, which are connected to the power transmission section of the fourth embodiment, on one side of its outermost periphery. there is The power transmission loop coil TL4 is formed by winding a copper thin film wire, for example, one turn, and both ends (the center of the right side in the figure) are connected to the connection terminal O4-1 and the connection terminal O4-1. It is designated as O4-2. The copper thin film wire forming the power transmission loop coil TL4 has the same width and thickness over the entire circumference of the power transmission open coil TL4. Furthermore, in the power transmission open coil TL4, straight lines are provided on each of the upper side, lower side, left side, and right side in FIG. 23, and the respective straight lines are connected by curved lines.

Next, the configuration of the coil CL4-1 constituting the power transmission open coil of the fourth embodiment, which is laminated directly below the power transmission loop coil TL4 via the film BF4-1, will be described using FIG. . FIG. 24 is a plan view showing only the coil CL4-1.

As shown in FIG. 24, the coil CL4-1 that constitutes the power transmission open coil of the fourth embodiment has an open end T4-1 at the outermost peripheral portion thereof. The coil CL4-1 is configured by, for example, a copper thin film wire spirally wound three and a half turns counterclockwise starting from the open end T4-1, from the outermost periphery toward the innermost periphery. ing. Further, a via V4 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL4-2 layered directly under it in FIG. The copper thin film wire forming the coil CL4-1 has the same width and thickness over the entire circumference of the coil CL4-1. Furthermore, in the coil CL4-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

Next, the configuration of the coil CL4-2 laminated directly below the coil CL4-1 via the film BF4-2 will be described with reference to FIG. FIG. 25 is a plan view showing only the coil CL4-2.

As shown in FIG. 25, the coil CL4-2, which together with the coil CL4-1 constitutes the power transmission open coil of the fourth embodiment, has an electrical connection with the coil CL4-1 at its innermost peripheral portion. is connected to the via V4 for That is, the coil CL4-1 and the coil CL4-2 are connected in series. Then, the coil CL4-2 starts from the via V4 in the clockwise direction (that is, in the direction opposite to the coil CL4-1), from its innermost circumference to its outermost circumference, similarly to the coil CL4-1, for example A copper thin film wire is spirally wound three and a half turns. Further, the outermost peripheral portion thereof is an open end T4-2. The copper thin film wire forming the coil CL4-2 has the same width and thickness over the entire circumference of the coil CL4-2, like the coil CL4-1. Furthermore, in the coil CL4-2, like the coil CL4-1, parallel straight lines are provided on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the positional relationship between the copper thin film wires constituting the coil CL4-1 and the coil CL4-2 is as follows: the position of the copper thin film wire of the coil CL4-1 wound counterclockwise; The position of the copper thin film wire of the coil CL4-2 wound in the clockwise direction coincides with the position of the copper thin film wire of the coil CL4-1 and the coil CL4-2 when viewed from the winding center of each copper thin film. Wire is wound. The coil CL4-1 and the coil CL4-2 are connected in series by the via V4 connected to the innermost circumference of each. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL4-1 is reversed (turned back) at the innermost peripheral portion in the opposite direction, so that the coil CL4-2 is turned from the innermost peripheral portion to the outermost peripheral portion. is wound to

Next, the positional relationship between the copper thin film wires constituting the power transmission loop coil TL4 and the power transmission open coil (that is, the coil CL4-1 and the coil CL4-2) of the fourth embodiment will be described with reference to FIG. do. FIG. 26 is a plan view showing how the power transmission loop coil TL4 and the coils CL4-1 and CL4-2 overlap. (illustration is omitted in )) are indicated by dashed lines, respectively, of the power transmission open coils CL4-1 and CL4-2 of the fourth embodiment. As described above, the positional relationship between the copper thin film wires forming the coil CL4-1 and the coil CL4-2 are exactly the same in FIG.

As shown by the dashed line in FIG. 26, the coil CL4-1 wound from the outer circumference to the inner circumference and connected to the coil CL4-2 by the via V4 at its innermost circumference has , and the thin film copper wire is wound such that each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire. On the other hand, as shown by the solid line in FIG. 26, the power transmission loop coil TL4 is laminated along the outer edge of the coil CL4-1, and the connection terminal O4-1 and the connection terminal O4-2 are arranged outside the winding. It has a protruding shape. As a result, as shown in FIG. On each of the left and right sides, the copper thin film wires forming the power transmission loop coil TL4 and the power transmission open coils (coil CL4-1 and coil CL4-2) of the fourth embodiment are laminated so as to overlap each other.

Next, regarding the lamination state of the power transmission loop coil TL4, the coils CL4-1 and CL4-2, and the connection state of the coils CL4-1 and CL4-2, the cross section of the AA' portion shown in FIG. Description will be made with reference to FIG. 27 as a diagram.

As shown in FIG. 27, on the left side of FIGS. 23 to 26, a coil CL4-1 and a coil CL4-2 are laminated with a film BF4-2 interposed therebetween, and are electrically connected to each other by vias. there is At the position of the via V4, the counterclockwise winding of the coil CL4-1 is cut back (folded back) to form the clockwise winding of the coil CL4-2. On the other hand, the power transmission open coil and the power transmission loop coil TL4 of the fourth embodiment composed of the coil CL4-1 and the coil CL4-2 are laminated with the film BF4-1 (see FIG. 23) interposed therebetween.

(III) Manufacturing method of power transmitting coil TC and power receiving coil RC
Next, a method for manufacturing the power transmitting coil and the power receiving coil of the fourth embodiment will be described.

As the manufacturing method, basically the same as the conventional method, the first manufacturing method including the following steps (a)-1 to (a)-11, or the following (b)-1 to (b)-12 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Form a copper thin film on both sides of the film BF4-2 (a)-2: Apply a resist on each of the copper thin films (both sides) formed in (a)-1 above (a)- 3: Patterning the resist applied in (a)-2 above to the copper thin film wires of coil CL4-1 and coil CL4-2 on each side (a)-4: Etching treatment after patterning in (a)-3 above to form copper thin film wires as coils CL4-1 and CL4-2.
(a)-6: Form a copper thin film on the entire one side of the film BF4-1 (a)-7: Apply a resist on the copper thin film formed in (a)-6 above (a)-8: Above ( Patterning the resist applied in a)-7 to the copper thin film wire of the power transmission loop coil TL4 (a)-9: After the patterning of (a)-8 above, an etching treatment is performed to form a copper thin film wire as the power transmission loop coil TL4. (a)-10: The power transmission open coil of (a)-5 above and the power transmission loop coil TL4 of (a)-9 above are bonded together to form the power transmission coil of the fourth embodiment (a)-11: The connection terminal O4-1 and the connection terminal O4-2 and the power transmission unit of the fourth embodiment (for the power transmission device T of the fourth embodiment) or the power reception unit of the fourth embodiment (for the power reception device of the fourth embodiment) case) and (b) Second manufacturing method
(b)-1: Copper thin films are formed on both sides of the film BF4-2. (b)-2: Through-holes are formed at positions corresponding to vias V4 by laser or the like. copper plating by electroless copper plating and electrolytic copper plating to form vias V4 (b)-4: Resist is applied to the copper plating (both sides) formed in (b)-3 above. (b)-5: Patterning the resist applied in (b)-4 above to the copper thin film wires of coil CL4-1 and coil CL4-2 (b)-6: Etching treatment after patterning in (b)-5 above Then, copper thin film wires are formed as the coil CL4-1 and the coil CL4-2 to form the power transmission open coil of the fourth embodiment.
(b)-7: Form a copper thin film on the entire one side of the film BF4-1 (b)-8: Apply a resist on the copper thin film formed in (b)-7 above (b)-9: Above ( b) Patterning the resist applied in -8 to the thin copper wire of the power transmission loop coil TL4 (b)-10: After the patterning in (b)-9 above, etching is performed to form a thin copper wire as the power transmission loop coil TL4. (b)-11: The power transmission open coil of (b)-6 above and the power transmission loop coil TL4 of (b)-10 above are bonded together to form the power transmission coil of the fourth embodiment (b)-12: The connection terminal O4-1 and the connection terminal O4-2 and the power transmission unit of the fourth embodiment (in the case of the power transmission device of the fourth embodiment) or the power reception unit of the fourth embodiment (in the case of the power reception device of the fourth embodiment) ) and

(IV) Fourth embodiment
Next, based on the experimental results by the inventors of the present application, the effect of performing power transmission using the power transmission system of the fourth embodiment including the power transmission coil and the power reception coil of the fourth embodiment is shown in FIGS. Description will be made with reference to FIG. Note that in the following description, simulation results of the effect of power transmission using the power transmission system of the fourth embodiment will be used instead of simulation results of the effect of power transmission using the power transmission system of the conventional example. I will explain while comparing with.

In the case described below, as a conventional example, a loop coil having a square shape (see FIG. 23) with a side of 100 mm and having a one-turn (one-turn) structure is arranged coaxially with the central axis of the loop coil and A power transmission system including a power transmission coil and a power reception coil was used, which was composed of an open coil having a square shape with a side of 100 mm and a tubular 5.5-turn (5.5 turns) structure, which was the same as the open coil.

(1) 4-1 Example
First, the relationship between the resonance frequency and the value of the S parameter (S21) when changing the distance between the power transmitting coil and the power receiving coil in the fourth embodiment will be described using FIG. In obtaining the simulation results shown in FIG. 28, the size of each of the power transmitting coil and the power receiving coil in the fourth embodiment is assumed to be 100 millimeters on each side. Here, the distance between the power transmitting coil and the power receiving coil in the fourth embodiment is the distance between the power transmitting open coil and the power receiving open coil in the fourth embodiment, in other words, it is also the transmission distance. In the following description, the distance between the power transmitting coil and the power receiving coil will be referred to as "transmission distance d".

As shown in FIG. 28(a), when the power transmitting coil and the power receiving coil of the fourth embodiment are used, the transmission distance d is changed, the value of the S parameter hardly changes. This means that when the power transmitting coil and the power receiving coil of the fourth embodiment are used, high transmission efficiency (high S This means that the resonance frequency indicating the parameter value) hardly changes. That is, when the power transmitting coil and the power receiving coil of the fourth embodiment are used, even in applications where it is difficult to always maintain the transmission distance d at a constant value, such as a wireless power transmission system for electric vehicles, resonance It shows that high transmission efficiency can be obtained without frequency adjustment. In contrast to the case shown in FIG. 28(a), in the case of the conventional example shown in FIG. 28(b), when the transmission distance d is changed, there is almost no resonance frequency at which the value of the S parameter is constant. In other words, in the case of the conventional example, it is necessary to adjust the resonance frequency in order to obtain high transmission efficiency in applications where it is difficult to always maintain the transmission distance d at a constant value. This indicates that adaptation to

Also, as shown in FIG. 28(a), when the power transmitting coil and the power receiving coil of the fourth embodiment are used, high transmission efficiency is obtained when the transmission distance d is between 38 mm and 50 mm. Therefore, it can be seen from this that at the transmission distance d, there is little reflection in the power transmitting coil or the power receiving coil of the fourth embodiment, and therefore high transmission efficiency can be obtained without using a so-called impedance adjustment circuit.

(2) 4-2 Example
Next, the relationship between the transmission efficiency and the resonance frequency when using the power transmitting coil and the power receiving coil of the fourth embodiment will be described with reference to FIG. 29 .

As shown in FIG. 29(a) for the relationship between the resonance frequency and the transmission efficiency, and in FIG. In the coil, the S parameter (S11) is extremely small near the resonance frequencies of 30 MHz to 40 MHz. That is, at the resonance frequency, the reflection from the power transmitting coil and the power receiving coil of the fourth embodiment is small, so that the power supplied to the power transmitting coil (that is, [input power to the power transmitting coil] - [power at the power transmitting coil reflected power]) divided by the input power (supply power/input power), which means that the incidence rate is extremely high. From the viewpoint of transmission efficiency, looking at the change in the S parameter (S21) shown in FIG. 29(b) and the change in efficiency (overall) shown in FIG. It can be seen that efficiency is obtained.

(3) 4-3 embodiment
Finally, the relationship between the distance from the center of the power transmitting coil and the power receiving coil and the leakage electromagnetic field when the power transmitting coil and the power receiving coil of the fourth embodiment are used will be described with reference to FIG. Note that FIG. 30 shows the leakage magnetic field when power of 1 watt is input to the power transmitting coil or the power receiving coil of the fourth embodiment. Furthermore, the horizontal axis of FIG. 30 indicates the distance based on the center of the coil CL4-1 and the coil CL4-2, and the vertical axis indicates the leakage magnetic field when 1 microampere/meter is 0 decibel. . Furthermore, "Invention 1" shown in FIG. 30 shows the relationship between the distance from the center and the leakage electromagnetic field when the resonance frequency is 37 MHz, and "Invention 2" shows the relationship when the resonance frequency is 32 MHz. It shows the relationship between the distance from the center and the leakage electromagnetic field. "Conventional example 1" shows the relationship between the distance from the center and the leakage electromagnetic field in the conventional example when the resonance frequency is 38 MHz, and "Conventional example 2" shows the conventional example when the resonance frequency is 33 MHz. shows the relationship between the distance from the center and the leakage electromagnetic field.

Comparing the power transmission coil and the power reception coil of the fourth embodiment with the coil in the power transmission system of the conventional example from the viewpoint of leakage electromagnetic field, as shown in FIG. Therefore, the leakage electromagnetic field (leakage magnetic flux) by the power transmission coil and the power reception coil of the fourth embodiment is suppressed to be lower than the leakage electromagnetic field by the coils in the power transmission systems of the respective conventional examples. This is because in the power transmission open coil and the power reception open coil of the fourth embodiment, the copper thin-film wires of the coil CL4-1 and the coil CL4-2, which are stacked at the same position with the film BF4-2 interposed therebetween, are oriented in opposite directions. Since the current flows, the direction of the leakage electromagnetic field (leakage magnetic flux) generated by them becomes the center direction of each of the coils CL4-1 and CL4-2, and as a result, the leakage electromagnetic field to the outside is suppressed. It is considered that This fact has also been confirmed by the inventor of the present invention through a three-dimensional simulation of leakage magnetic flux.

Therefore, from the simulation results shown in FIG. 30, when compared at the same position viewed from the center of the winding, the leakage electromagnetic field (leakage magnetic flux) in the power transmission coil and the power reception coil of the fourth embodiment is significantly higher than that in the conventional example. It turns out that it is kept low.

As described above, according to power transmission using the power transmission system of the fourth embodiment including the power transmission coil and the power reception coil of the fourth embodiment, together with the power transmission open coil (power reception open coil) of the fourth embodiment, In the power transmitting open coil (power receiving open coil) of the fourth embodiment that constitutes the power transmitting coil (power receiving coil) of the fourth embodiment, the coil CL4-1 and the coil CL4-2 are stacked, and the coil CL4-1 The innermost peripheral end portion and the innermost peripheral end portion of the coil CL4-2 wound in the opposite direction to the coil CL4-1 are connected by the via V4. Further, the outermost peripheral end of the coil CL4-1 is an open end T4-1, and the outermost peripheral end of the coil CL4-2 is an open end T4-2. Therefore, when non-contact power transmission is performed with the power transmission open coil and the power reception open coil of the fourth embodiment facing each other, the frequency dependence of the change in the transmission distance d is small (see FIG. 28). Even if the transmission distance d changes, power can be transmitted with high transmission efficiency without changing the resonance frequency. In addition, it is possible to reduce the leakage electromagnetic field to the outside of the power transmitting coil or the power receiving coil of the fourth embodiment, and to suppress the reflection at the resonance frequency to increase the transmission efficiency (see FIGS. 29 and 30). Furthermore, due to the parasitic capacitance between the coil CL4-1 and the coil CL4-2, the resonance frequency of the power transmission open coil or the power reception open coil of the fourth embodiment can be reduced, so the power transmission of the fourth embodiment When adjusting the resonance frequency of the coil or power receiving coil, the length of the coil CL4-1 and the coil CL4-2 can be shortened, and power loss and heat generation due to the electrical resistance of the coil CL4-1 and the coil CL4-2 can be reduced. can be suppressed.

Furthermore, each of the coil CL4-1 and the coil CL4-2 is formed by winding a copper thin film wire that is flat in the radial direction of the coil CL4-1 or the coil CL4-2, and by winding the copper thin film wire Since the coil CL4-1 and the coil CL4-2 are laminated so that the positions of the windings of the coil CL4-1 and the coil CL4-2 are aligned in the radial direction, the coil CL4-1 and the coil CL4-2 are stacked. −2, the resonance frequency of the power transmission open coil or the power reception open coil of the fourth embodiment can be further reduced.

In the fourth embodiment and each example described above, in the power transmitting open coil (power receiving open coil) of the fourth embodiment, the radial position of each turn of the coil CL4-1 and the position of each turn of the coil CL4-2 Although the positions in the radial direction are configured to match (see FIGS. 24 to 26), the coil CL4-1 and the coil CL4 are not limited to this. -2, it is possible to adjust the desired parasitic capacitance.

Further, in the above-described fourth embodiment and each example, the parasitic capacitance that contributes to the adjustment of the resonance frequency is the parasitic capacitance between the power transmission open coil and the power transmission loop coil TL4 in the fourth embodiment and the parasitic capacitance between the power transmission open coil and the power transmission loop coil TL4. The parasitic capacitance between the power receiving open coil and the power receiving loop coil of the embodiment is used for adjustment. However, in addition to this, either the open end T4-1 or the open end T4-2 of the power transmission open coil of the fourth embodiment and / or the open end T4-1 or the open end of the power reception open coil of the fourth embodiment A capacitor may be further connected in series or parallel to either T4-2 or via V4 to adjust the resonance frequency. Alternatively, a capacitor may be further connected in parallel to either the connection terminal O4-1 or the connection terminal O4-2 of the power transmission loop coil TL4.

(E) Fifth embodiment
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 31 to 45. FIG.
(I) 5-1 embodiment
First, the 5-1 embodiment according to the present invention will be described with reference to FIGS. 31 to 37. FIG.

(i) Regarding the overall configuration and operation of the power transmission system of the 5-1 embodiment
Since the overall configuration and operation of the power transmission system of the 5-1 embodiment are basically the same as the overall configuration and operation of the power transmission system S3 of the third embodiment, detailed description will be omitted.

(ii) Configuration of the power transmitting coil (power receiving coil) of the 5-1 embodiment
Next, configurations of the power transmitting coil and the power receiving coil of the 5-1 embodiment, which are used in the power transmission system of the 5-1 embodiment described above, will be described with reference to FIGS. 31 to 36. FIG. Note that the power transmitting coil and the power receiving coil of the 5-1 embodiment basically have the same configuration. That is, the configuration of the power transmitting loop coil of the 5-1 embodiment and the configuration of the power receiving loop coil of the 5-1 embodiment are basically the same. Also, the configuration of the power transmission open coil of the 5-1 embodiment and the configuration of the power reception open coil of the 5-1 embodiment are basically the same. Further, the positional relationship in the power transmitting coil of the 5-1 embodiment between the power transmitting loop coil of the 5-1 embodiment and the power transmitting open coil of the 5-1 embodiment, and the power receiving loop coil of the 5-1 embodiment and the power receiving open coil of the 5-1 embodiment in the power receiving coil of the 5-1 embodiment are basically the same. Therefore, in the following description, the structure of the power transmitting coil of the 5-1 embodiment will be described. 31 to 35 are plan views showing the structure of the power transmission coil of Embodiment 5-1, and FIG. 36 is a partial cross-sectional view showing the structure of the power transmission coil of Embodiment 5-1. 31 to 35 are plan views of the power transmission coil of the 5-1 embodiment viewed from the power transmission unit side of the 5-1 embodiment in the power transmission device of the 5-1 embodiment.

As shown in the plan view of FIG. 31, in the power transmission coil of the 5-1 embodiment, the power transmission loop coil TL5 and the power transmission open coil of the 5-1 embodiment not shown in FIG. The films are laminated in the paper surface direction of FIG. 31 via the film BF5-1. In addition, the power transmission open coil of the 5-1 embodiment is configured by laminating two coils CL5-1 and CL5-2, which will be described later, in the paper surface direction of FIG. 31 via an insulating film BF5-2. be done. Further, the winding centers of the copper thin film wires, which will be described later and which respectively constitute the power transmission loop coil TL5, the coil CL5-1, and the coil CL5-2, are the same or substantially the same.

As shown in FIG. 31, the power transmission loop coil TL5 has a connection terminal O5-1 and a connection terminal O5-2 connected to the power transmission section of the 5-1 embodiment on one side of the outermost periphery. are doing. The power transmission loop coil TL5 is formed by, for example, winding a copper thin film wire once (one turn), and both ends thereof (in the case shown in FIG. 31, the center of the right side portion) are connected to the connection terminals O5-1. and the connection terminal O5-2. The copper thin-film wire forming the power transmission loop coil TL5 has the same width and the same thickness over the entire circumference of the power transmission loop coil TL5. Further, in the power transmission loop coil TL5, straight lines are provided on each of the upper side, the lower side, the left side, and the right side in FIG. 31, and the respective straight lines are connected by curved lines.

Next, the configuration of the coil CL5-1 constituting the power transmission open coil of the 5-1 embodiment, which is laminated directly below the power transmission loop coil TL5 via the film BF5-1, will be described using FIG. explain. FIG. 32 is a plan view showing only the coil CL5-1.

As shown in FIG. 32, the coil CL5-1 that constitutes the power transmission open coil of the 5-1 embodiment has an open end T5-1 at its outermost peripheral portion. The coil CL5-1 is rotated counterclockwise starting from the open end T5-1, from the outermost peripheral portion to the innermost peripheral portion, for example, a copper thin film wire is spirally rotated five and a half turns (5.5 turns). It is configured by winding. A via V5 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL5-2 which is laminated directly under it in the paper surface direction of FIG. The copper thin film wire forming the coil CL5-1 has the same width and thickness over the entire circumference of the coil CL5-1. Furthermore, in the coil CL5-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

Next, the configuration of the coil CL5-2 laminated directly below the coil CL5-1 via the film BF5-2 will be described with reference to FIG. FIG. 33 is a plan view showing only the coil CL5-2.

As shown in FIG. 33, the coil CL5-2, which together with the coil CL5-1 constitutes the power transmission open coil of the 5-1 embodiment, has an electrical connection with the coil CL5-1 at its innermost peripheral portion. The via V5 for configuration is connected. That is, the coil CL5-1 and the coil CL5-2 are connected in series. Then, the coil CL5-2 starts from the via V5 and rotates clockwise (that is, in the direction opposite to the coil CL5-1) from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirally. It is configured by winding three and a half turns (3.5 turns). Further, the outermost peripheral portion thereof is defined as an open end T5-2. The copper thin film wire forming the coil CL5-2 has the same width and thickness over the entire circumference of the coil CL5-2. Furthermore, in the coil CL5-2, similarly to the coil CL5-1, the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the relationship between the copper thin film wires constituting the coil CL5-1 and the coil CL5-2 is determined by the number of turns (5 Each copper thin film wire is wound such that the number of turns (three and a half turns) of the copper thin film wire of the coil CL5-2 wound clockwise is different from the number of turns (three and a half turns). Also, the width of the entire side of the winding of the coil CL5-1 (indicated by symbol "W1" in FIG. 32) and the width of the entire side of the winding of the coil CL5-2 (indicated by symbol "W2" of FIG. 33). and are substantially the same, the width of the copper thin film wire of the coil CL5-2 (indicated by symbol “WW2” in FIG. 33) is the same as the width of the copper thin film wire of the coil CL5-1 (indicated by symbol “WW1” in FIG. 32). ) is wider. The coil CL5-1 and the coil CL5-2 are connected in series by the via V5 connected to the innermost circumference of each. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL5-1 is cut back (folded back) in the opposite direction at the innermost peripheral portion, so that the coil CL5-2 is wound from the innermost peripheral portion to the outermost peripheral portion. is wound to

Next, the positional relationship between the copper thin-film wires respectively constituting the power transmission loop coil TL5 and the power transmission open coil (that is, the coil CL5-1 and the coil CL5-2) of the 5-1 embodiment is shown in FIGS. 35 will be used. Note that FIG. 34 is a plan view showing the overlapping state of the power transmission loop coil TL5 and the coil CL5-1. The coil CL5-1 of the power transmission open coil of the 5-1 embodiment, which is laminated via the coil CL5-1, is indicated by a dashed line. FIG. 35 is a plan view showing the overlapping state of the coil CL5-1 and the coil CL5-2 of the power transmission open coil of the 5-1 embodiment. Coils CL5-2 stacked via BF5-2 (illustration is omitted in FIG. 35) are indicated by dashed lines.

As shown by the dashed line in FIG. 34, the coil CL5-1 wound from the outer circumference to the inner circumference and connected to the coil CL5-2 by the via V5 at its innermost circumference has , and the thin film copper wire is wound such that each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire. On the other hand, as shown by the solid line in FIG. 34, the power transmission loop coil TL5 is laminated along the outer edge of the coil CL5-1, and the connection terminal O5-1 and the connection terminal O5-2 protrude outside the winding. It is considered to be a shape that

Next, as shown by the dashed line in FIG. 35, even the coil CL5-2 wound from the inner circumference to the outer circumference and connected to the coil CL5-1 by the via V5 at the innermost circumference is a quarter turn. Each curved part is formed and the thin copper film wire is wound so that the position of the straight part is shifted to the inner peripheral side by a quarter of the winding pitch of the thin copper film wire. On the other hand, as indicated by the solid line in FIG. 35, the coil CL5-1 is laminated along the outer edge of the coil CL5-2, and they are connected in series by a via V5.

As shown in FIGS. 34 and 35 above, in the 5-1 embodiment in which the power transmission loop coil TL5 and the coil CL5-1 and the coil CL5-2 of the power transmission open coil of the 5-1 embodiment are stacked In the power transmission coil, the copper thin-film wires constituting the power transmission loop coil TL5 and the power transmission open coil (coil CL5-1 and coil CL5-2) of the 5-1 embodiment are substantially overlapped on each of the upper, lower, left, and right sides. Laminated.

Next, the lamination state of the power transmission loop coil TL5, the coils CL5-1 and CL5-2, and the connection state of the coils CL5-1 and CL5-2 are shown in FIGS. Description will be made with reference to FIG. 36 as a partial cross-sectional view.

As shown in FIG. 36, on the left side of FIGS. 31 to 35, a coil CL5-1 and a coil CL5-2 are laminated with a film BF5-2 interposed therebetween, and electrically connected to each other by a via V5. ing. At the position of the via V5, the counterclockwise winding of the coil CL5-1 is cut back (folded back) to form the clockwise winding of the coil CL5-2. On the other hand, the power transmission open coil and the power transmission loop coil TL5 of the 5-1 embodiment composed of the coil CL5-1 and the coil CL5-2 are laminated with the film BF5-1 (see FIG. 31) interposed therebetween.

(iii) Method for manufacturing the power transmitting coil and the power receiving coil of the 5-1 embodiment
The manufacturing method of the power transmitting coil and the power receiving coil of the 5-1 embodiment is basically the same as the manufacturing method of the power transmitting coil and the power receiving coil of the fourth embodiment, so the detailed description is omitted.
(iv) 5-1 Example
Next, based on the results of experiments by the inventors of the present application, the effect of performing power transmission using the power transmission system of the 5-1 embodiment including the power transmission coil and the power reception coil of the 5-1 embodiment will be described with reference to FIG. FIG. 37 is a diagram showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 5-1 embodiment. Further, in the following description, the copper thin film wires constituting the power transmitting loop coil TL5 and the power receiving loop coil of the 5-1 embodiment are simply referred to as “loop coil thin copper film wires”, and the power transmitting loop coil of the 5-1 embodiment A copper thin film wire that constitutes each of the open coil and the power receiving open coil is simply referred to as an "open coil copper thin film wire". Also, FIG. 37 shows the relationship between the resonance frequency as the effect and the value of the S parameter (S11) related to reflectance, and the value of the S parameter (S21) related to the resonance frequency and transmission efficiency as the effect. is a diagram showing the relationship of The specifications of the loop-coil thin-film copper wire and the open-coil thin-film copper wire for which the experimental results shown in FIG. 37 were obtained are as follows.
・Width of loop coil copper thin film wire: 2.0 mm ・Figs. External dimensions on the plane indicated by 35: about 100 mm long x about 100 mm wide ・Thicknesses of open coil copper thin film wire and loop coil copper thin film wire: all constant and the same ・Number of turns of copper thin film wire of coil CL5-1: Five and a half turns (5.5 turns. See Figures 32 and 34)
・The number of turns of the copper thin film wire of the coil CL5-2: three and a half turns (3.5 turns. See Figs. 33 and 34)
・Pitch in coil CL5-1: 2 mm ・Pitch in coil CL5-2: 3.2 mm ・Interval between adjacent open coil copper thin film wires: 0.6 mm for both coil CL5-1 and coil CL5-2 As for the conventional power transmission coil or power reception coil shown in FIG. Originally, the same specifications as those of the loop coil thin film copper wire and the open coil thin film copper wire are used.

As shown in FIG. 37, both the power transmitting coil (power receiving coil) of the 5-1 embodiment and the power transmitting coil (power receiving coil) of the conventional example exhibit high transmission efficiency (parameter S21), but the coil CL5- In the case of the 5-1 embodiment in which the number of turns is changed between the coil CL5-2 and the coil CL5-2, the resonance frequency is as low as about half that of the conventional example. As for the resonance frequency, the same applies to the reflectance (parameter S11). The reason why such experimental results were obtained is that two coils (coil CL5-1 and coil CL5-2) with different self-resonant frequencies are stacked, resulting in a decrease in the mutual resonance frequency. Conceivable.

In the 5-1 embodiment described above, the open end T5-1 and the open end T5-2 of the outermost circumference of each of the coil CL5-1 and the coil CL5-2 are at the same winding position. Although the inner circumference is also configured to be at the same position in the winding, in addition to this, either or both of the positions of the open end T5-1 and the open end T5-2 and the position of the innermost circumference are different. may be formed. In addition, the coil CL5-1 and the coil CL5-2 of the 5-1 embodiment are connected at their innermost peripheral portions by vias V5. and may be electrically independent of each other without being connected at any position.

As described above, according to power transmission using the power transmission system of the 5-1 embodiment including the power transmission coil and the power reception coil of the 5-1 embodiment, the power transmission loop coil TL5 (5-1 embodiment The power transmitting open coil or the power receiving open coil of the 5-1 embodiment, which constitutes the power transmitting coil or the power receiving coil of the 5-1 embodiment together with the power receiving loop coil of the 5-1 embodiment, is the coil CL5-1 and the coil CL5-1 with mutually different self-resonant frequencies Since the CL5-2 is concentrically laminated, the mutual resonance frequency between the coil CL5-1 and the coil CL5-2 is lowered, so that the entire power transmitting coil or power receiving coil of the 5-1 embodiment can reduce the resonance frequency of

Also, the number of turns of the copper thin film wires constituting the coil CL5-1 and the coil CL5-2 are made different, or the pitch of the coil CL5-1 and the pitch of the coil CL5-2 are made different. Since the self-resonant frequencies of the coils CL5-1 and CL5-2 are made different by one or both of them (see FIGS. 32 to 34), by selecting a desired self-resonant frequency, the fifth -1 The resonance frequency of the entire power transmitting coil or power receiving coil of the embodiment can be lowered to a desired value.

Furthermore, since each of the coil CL5-1 and the coil CL5-2 is formed by winding the copper thin film wire that is flat in the radial direction of the power transmitting coil or the power receiving coil of the 5-1 embodiment, the coil CL5-1 and the coil CL5-2 By effectively lowering the mutual resonance frequency with the coil CL5-2, it is possible to reduce the resonance frequency of the power transmitting coil or the power receiving coil as a whole in the 5-1 embodiment.

Furthermore, the outermost peripheral end of the coil CL5-1 is an open end T5-1, the outermost peripheral end of the coil CL5-2 is an open end T5-2, and the innermost peripheral end of the coil CL5-1 and the innermost peripheral end of the coil CL5-2 are connected by the via V5, and the power transmission loop coil TL5 arranged concentrically with the coil CL5-1 and the like is laminated, so that the coil CL5-1 and the coil In the contactless power transmission system including the power transmission coil and the power reception coil of the 5-1 embodiment, which includes CL5-2 and the power transmission loop coil TL5, the resonance frequency of the power transmission system as a whole can be reduced. As described above, even if the coils CL5-1 and CL5-2 are not connected at any position and are electrically independent of each other, the same effect as described above can be obtained.

(II) 5-2 embodiment
Next, a 5-2 embodiment, which is another embodiment of the present invention, will be described with reference to FIGS. 38 to 43. FIG.

The power transmission system of the 5-2 embodiment described below is the power transmission system of the 5-1 embodiment described above. Only the configurations of the power transmission open coil and the power reception open coil of the -2 embodiment are different, and the other configurations and the manufacturing method thereof are the same as those of the power transmission system of the 5-1 embodiment. Therefore, in the following description, only the portions with different configurations will be described, and descriptions of other similar configurations and manufacturing methods will be omitted. Also, similarly to the power transmission system of the 5-1 embodiment, the configuration of the power transmission open coil of the 5-2 embodiment and the configuration of the power reception open coil of the 5-2 embodiment are basically the same. Therefore, in the following description, the structure of the power transmission open coil of the 5-2 embodiment will be described. 38 to 40 are plan views showing the structure of the power transmission open coil of the second embodiment. It is a top view at the time of looking at the power transmission coil of 2 embodiment.

As shown in the plan views of FIGS. 38 to 40, the power transmission open coil of the power transmission coil of the 5-2 embodiment includes two coils CL5-11 and CL5-21, which will be described later, each having an insulating film. are laminated in the paper plane direction of FIG. It should be noted that the winding centers of the copper thin film wires constituting the power transmission loop coil and the coils CL5-11 and CL5-21 of the 5-2 embodiment are the same or substantially the same.

Then, as shown in FIG. 38, the coil CL5-11 constituting the power transmission open coil of the 5-2 embodiment has an open end T5-11 at the outermost peripheral portion. Then, the coil CL5-11 is counterclockwise starting from the open end T5-11, from the outermost periphery to the innermost periphery, for example, a copper thin film wire is spirally turned ten and a half turns (10.5 turns). It is configured by winding. A via V5 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL5-21 which is laminated directly under it in the paper surface direction of FIG. The copper thin film wire forming the coil CL5-11 has the same width and thickness over the entire circumference of the coil CL5-11. Furthermore, in the coil CL5-11, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

Next, the configuration of the coil CL5-21 layered directly below the coil CL5-11 will be described with reference to FIG. FIG. 39 is a plan view showing only the coil CL5-21.

As shown in FIG. 39, the coil CL5-21, which together with the coil CL5-11 constitutes the power transmission open coil of the 5-2 embodiment, has an electrical connection with the coil CL5-11 at its innermost peripheral portion. The via V5 for configuration is connected. That is, the connection between the coil CL5-11 and the coil CL5-21 is a series connection, like the coil CL5-1 and the coil CL5-2 of the 5-1 embodiment. Then, the coil CL5-21 starts from the via V and rotates clockwise (that is, in the direction opposite to the coil CL5-11) from its innermost circumference to its outermost circumference, for example, a copper thin film wire is wound in a spiral shape. It is configured by being wound two and a half turns (2.5 turns). Further, the outermost peripheral portion is an open end T5-21. The copper thin film wire forming the coil CL5-21 has the same width and thickness over the entire circumference of the coil CL5-21. Furthermore, in the coil CL5-21, similarly to the coil CL5-11, the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the relationship between the copper thin film wires constituting the coil CL5-11 and the coil CL5-21 is the number of turns of the copper thin film wire of the coil CL5-11 wound counterclockwise (ten Each copper thin film wire is wound such that the number of turns (two and a half turns) of the copper thin film wire of the coil CL5-21 wound clockwise is different. In addition, the width of the entire side of the winding of the coil CL5-11 (indicated by symbol "W11" in FIG. 38) and the width of the entire side of the winding of the coil CL5-21 (indicated by symbol "W21" of FIG. 39). and are substantially the same, the width of the copper thin film wire of the coil CL5-21 (indicated by the symbol "WW21" in FIG. 39) is the same as the width of the copper thin film wire of the coil CL5-11 (indicated by the symbol "WW11" in FIG. ) is wider. The coil CL5-11 and the coil CL5-21 are connected in series by vias V connected to their innermost peripheral portions. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL5-11 is reversed (turned back) at the innermost peripheral portion in the opposite direction, so that the coil CL5-21 is wound from the innermost peripheral portion to the outermost peripheral portion. is wound to

Furthermore, as shown in FIG. 39, the coil CL5-21 of the 5-2 embodiment (in other words, the copper The radial interval of the coil CL5-21 of the copper thin film wire (indicated by the symbol "V21" in FIG. 39) is the width of the copper thin film wire (the symbol "WW21" in FIG. 39) (indicated by ).

Next, the positional relationship between the copper thin film wires constituting the power transmission open coils (that is, the coil CL5-11 and the coil CL5-21) of the 5-2 embodiment will be described with reference to FIG. FIG. 40 is a plan view showing the overlapping state of the coil CL5-11 and the coil CL5-21 of the 5-2 embodiment. The coils CL5-21, which are connected to each other, are indicated by dashed lines.

As shown in FIG. 40, in the coil CL5-11 and the coil CL5-21 connected by the via V5 at the innermost circumference, each quarter turn has a quarter of the winding pitch of the copper thin film wire. Each curved portion is formed and the copper thin film wire is wound so that the positions of the respective straight portions are shifted one by one toward the inner peripheral side. As shown in FIG. 39 above, the power transmission loop coil of the 5-2 embodiment (not shown) and the coil CL5-11 and the coil CL5-21 of the power transmission open coil of the 5-2 embodiment are stacked in the fifth -2 In the power transmitting coil of the embodiment, the copper thin film wires forming the coil CL5-11 and the coil CL5-21 are laminated so as to overlap each other on the upper, lower, left, and right sides. The lamination state and connection state of the coil CL5-11 and the coil CL5-21 in the 5-2 embodiment are the same as the lamination state and connection state of the coil CL5-1 and the coil CL5-2 in the 5-1 embodiment. Since they are basically the same, a detailed description is omitted.

(i) 5-2 embodiment
Next, based on the results of experiments by the inventors of the present application, the effect of performing power transmission using the power transmission system of the 5-2 embodiment including the power transmission coil and the power reception coil of the 5-2 embodiment 41 through 43. FIG. 41 to 43 are diagrams showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 5-2 embodiment. Further, in the following 5-2 embodiment, similarly to the 5-1 embodiment above, the copper thin film wires constituting the power transmitting loop coil and the power receiving loop coil of the 5-2 embodiment are simply referred to as "loop coil copper The copper thin film wires constituting the power transmitting open coil and the power receiving open coil of the 5-2 embodiment are simply referred to as "open coil copper thin film wires". 41 and 42 show the relationship between the resonance frequency as the above effect and the value of the S parameter (S11) related to the reflectance, and the resonance frequency as the above effect and the S parameter (S21) related to the transmission efficiency. is a diagram showing the relationship with the value of . Here, FIG. 42 is a diagram showing an enlarged horizontal axis (frequency axis) in FIG. 41, and the experimental results up to a frequency of 3 MHz in FIG. 41 are compressed in the left part of FIG. is displayed. On the other hand, FIG. 43 shows the relationship between the resonance frequency as the above effect and the value of the S parameter (S21) related to the transmission efficiency. FIG. 13 is a diagram showing a case where the number of turns of (including the coil CL5-21 of the 5-2 embodiment) is changed.

The specifications of the loop-coil thin-film copper wire and the open-coil thin-film copper wire for obtaining the experimental results shown in FIGS. 41 and 42 are as follows.
・Line width of loop coil copper thin film wire: 2 millimeters ・Thickness of copper thin film wire for each coil: all constant and the same
・Number of turns of coil CL5-21: Two and a half turns (2.5 turns. See Fig. 39.)
・Pitch in coil CL5-11: 2 mm ・Pitch in coil CL5-21: 8 mm ・Line width of copper thin film wire of coil CL5-11: 1.4 mm ・Line width of copper thin film wire of coil CL5-21: Spacing between adjacent copper thin film wires in 4 mm coil CL5-11: 0.6 mm Spacing between adjacent copper thin film wires in coil CL5-21: 4 mm On the other hand, conventional example 1 shown in FIGS. The specifications of the copper thin film wires constituting the power transmitting loop coil, the power receiving loop coil, the power transmitting open coil and the power receiving open coil in the power transmitting coil or the power receiving coil of Conventional Example 2 are as follows. In the following specifications of Conventional Example 1, the power transmitting loop coil and the power receiving loop coil in the power transmitting coil or the power receiving coil of Conventional Example 1 are simply referred to as "the loop coil of Conventional Example 1". Of the power transmitting open coil and the power receiving open coil in the coil, the open coil stacked at a position close to the loop coil of the conventional example 1 is simply referred to as the "first open coil of the conventional example 1". Furthermore, among the power transmitting open coil and the power receiving open coil of the power transmitting coil or the power receiving coil of Conventional Example 1, the open coil that is stacked farther from the loop coil of Conventional Example 1 is simply referred to as the "second open coil of Conventional Example 1." called. In addition, in the following specifications of Conventional Example 2, the power transmitting loop coil and the power receiving loop coil in the power transmitting coil or the power receiving coil of Conventional Example 2 are simply referred to as "the loop coil of Conventional Example 2". Among the power transmitting open coil and the power receiving open coil in the coil, the open coil that is stacked at a position close to the loop coil of the conventional example 2 is simply referred to as the "first open coil of the conventional example 2". Further, among the power transmitting open coil and the power receiving open coil of the power transmitting coil or the power receiving coil of Conventional Example 2, the open coil that is stacked farther from the loop coil of Conventional Example 2 is simply referred to as the "second open coil of Conventional Example 2." called.
・Line width of each copper thin film wire of loop coil of conventional example 1 and loop coil of conventional example 2: 6 mm ・Thickness of each copper thin film wire of each coil: all constant and the same ・First open coil of conventional example 1 And the number of turns of each of the first open coil of Conventional Example 2 and the second open coil of Conventional Example 2: ten and a half turns (10.5 turns)
・The number of turns of the second open coil of Conventional Example 1: two and a half turns (2.5 turns)
・Pitch of the first open coil of Conventional Example 1, the first open coil of Conventional Example 2, and the second open coil of Conventional Example 2: 2 mm ・Pitch of the second open coil of Conventional Example 1: 8 mm ・Conventional Example Width of the copper thin film wires of the first open coil of No. 1, the first open coil of Conventional Example 2, and the second open coil of Conventional Example 2: 1.4 mm ・The copper thin film wire of the second open coil of Conventional Example 1 Line width: 7.4 mm Spacing between adjacent copper thin film wires in each coil: 0.6 mm In addition, in FIG. , and the symbol "2.5T (interval 0.6 mm)" is the experimental result when the second open coil of Conventional Example 1 is used.

Then, as shown in FIGS. 41 and 42, respectively, by stacking the coil CL5-11 and the coil CL5-21 of the 5-2 embodiment, that is, by stacking open coils with different numbers of turns, mutual resonance It is possible to lower the resonance frequency, and furthermore, the reflectance is reduced and the transmission efficiency is improved. In particular, compared with the conventional example 2 shown in FIG. 42 (that is, when open coils with the same number of turns are laminated), the effect of lowering the resonance frequency is remarkable.

On the other hand, as shown in FIG. 43, in the relationship between the resonance frequency and the value of the S parameter (S21) related to the transmission efficiency, it can be seen that the resonance frequency is lowered as the number of turns of one open coil is smaller. I understand. In the case of the same number of turns (two and a half turns (2.5 turns)), the radial spacing of the copper thin film wire with the smaller number of turns, such as coil CL5-21, is the width of the copper thin film wire. By doing so, the transmission efficiency is improved.

As described above, according to power transmission using the power transmission system of the 5-2 embodiment including the power transmission coil and the power reception coil of the 5-2 embodiment, the power transmission system of the 5-1 embodiment In addition to the effect, since the radial interval V21 of the copper thin film wire in the coil CL5-21 having a small number of turns is equal to or larger than the width W21 of the copper thin film wire (see FIG. 39), The resonance frequency of the power transmitting coil or the power receiving coil as a whole can be lowered, and the transmission efficiency can be improved.

(III) 5-3rd embodiment
Next, a fifth-third embodiment, which is still another embodiment of the present invention, will be described with reference to FIGS. 44 and 45. FIG.

In the power transmission system of the 5-3 embodiment described below, the power transmission system of the 5-1 embodiment described above also has the power transmission coil and the power reception coil of the 5-3 embodiment. Only the configuration of the power transmission open coil and the power reception open coil of the -3 embodiment is different, and the other configuration and manufacturing method thereof are the same as those of the power transmission system of the 5-1 embodiment. Therefore, in the following description, only the portions with different configurations will be described, and descriptions of other similar configurations and manufacturing methods will be omitted. Also, similarly to the power transmission system of the 5-1 embodiment, the configuration of the power transmission open coil of the 5-3 embodiment and the configuration of the power reception open coil of the 5-3 embodiment are basically the same. Therefore, in the following description, the structure of the power transmission open coil of the 5-3 embodiment will be described. 44 and 45 are plan views showing the structure of the power transmission open coil of Embodiment 5-3. 5-3 It is a plan view of the power transmission coil of the embodiment.

As shown in plan views in FIGS. 44 and 45, the power transmission open coil of the power transmission coil of the 5-3 embodiment includes two coils CL5-31 and CL5-32, which will be described later, each having an insulating film. are laminated in the paper plane direction of FIG. At this time, in the power transmission open coil of the 5-3 embodiment, the copper thin film wire constituting the coil CL5-32 of the 5-3 embodiment is placed in the layer on which the coil CL5-31 of the 5-3 embodiment is laminated. part of is formed. That is, the coil CL5-32 of the 5-3rd embodiment is composed of two layers, a layer in which the coil CL5-31 is formed and a layer in which the remaining copper thin film wires of the coil CL5-32 are formed. The two layers are connected by a via V5, which will be described later. Also in the 5-3 embodiment, an insulating material such as a glass epoxy material or a thin film material in which ceramic particles or the like are dispersed can be used for insulation other than the film. Furthermore, the winding centers of the copper thin film wires forming the power transmission loop coil and the coils CL5-31 and CL5-32 of the 5-3rd embodiment are the same or substantially the same.

Then, as shown in FIG. 44, the coil CL5-31 constituting the power transmission open coil of the 5-3rd embodiment has an open end T5-12 at the outermost peripheral portion thereof. The coil CL5-31 is counterclockwise starting from the open end T5-12, from the outermost circumference to the innermost circumference, for example, a copper thin film wire spirals seven and a half turns (7.5 turns). It is wound and configured, and its innermost peripheral portion is an open end T5-13. The copper thin film wire forming the coil CL5-31 has the same width and thickness over the entire circumference of the coil CL5-31. Furthermore, in the coil CL5-31, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is On the other hand, in the coil CL5-32 that constitutes the power transmission open coil of the 5-3 embodiment, the winding position adjacent to the open end T5-13 of the coil CL5-31 is the open end T5-23. A gap G is insulated between the end T5-13 and the open end T5-23. The coil CL5-32 is composed of, for example, a copper thin film wire spirally wound three times (three turns) counterclockwise from the position of the open end T5-23 toward its innermost peripheral portion. In the innermost peripheral portion, there is provided an electrical connection between the copper thin film wire that constitutes the remaining winding of the coil CL5-32 that is laminated directly under it in the direction of the paper surface of FIG. Via V5 is connected.

Next, the configuration of the remaining windings of the coil CL5-32 will be described with reference to FIG. Note that FIG. 45 is a plan view showing only the remaining windings of the coil CL5-32.

As shown in FIG. 45, the remaining windings of the coil CL5-32 are electrically connected to the coil CL5-32 formed in the same layer as the coil CL5-31 at its innermost circumference. is connected to the via V5 for That is, the coil CL5-32 formed in the same layer as the coil CL5-31 and the remaining turns of the coil CL5-32 formed immediately below it are connected in series with the via V5 interposed therebetween. . Then, the coil CL5-32 shown in FIG. 45 is rotated clockwise starting from the via V5, from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirally turns ten and a half turns (10.5 turns). ) is wound. Further, the outermost peripheral portion thereof is an open end T5-22. The copper thin film wire forming the coil CL5-32 has the same width and thickness over the two layers and over the entire circumference of the coil CL5-32. Further, in the coil CL5-32 which is formed in two layers, each layer is provided with parallel linear portions on the upper side, lower side, left side and right side in FIGS. Each linear portion is connected by a substantially concentric arc-shaped curved portion. The connection state between the layers of the coil CL5-32 formed in two layers is basically the same as the connection state between the coil CL5-1 and the coil CL5-2 in the 5-1 embodiment. Therefore, detailed description is omitted.

Even with power transmission using the power transmission system of the 5-3 embodiment including the power transmission coil and the power reception coil of the 5-3 embodiment described above, the same operation as the power transmission system S of the 5-1 embodiment It can be effective.

In the above-described 5-3 embodiment, the case where a part of the winding of the coil CL5-32 is formed in the same layer as the coil CL5-31 has been described, but in addition to this, the coil CL5-32 It may also be configured to form all the turns as in one layer.

Further, even if the layers in which the two coils constituting the power transmitting open coil or the power receiving open coil in each of the fifth embodiments described above are formed are replaced (that is, the two coils viewed from the power transmitting loop coil or the power receiving loop coil) Even if the positions (orders) of the coils are exchanged), the same effects as those of the fifth embodiment can be obtained.

Furthermore, in each of the fifth embodiments described above, the case where the present invention is applied to a power transmission system including a power transmission coil and/or a power reception coil each having a loop coil and a two-layer open coil has been described. In addition, a power transmitting coil and/or a power receiving coil having no loop coil, two layers of open coils connected at the innermost peripheral end, and the outermost peripheral portion of each open coil serving as a connection terminal respectively The present invention can also be applied to power transmission systems. Even in this case, the same effects as those of the power transmission systems of the fifth embodiments can be obtained.

Furthermore, in each of the fifth embodiments described above, a capacitor is further connected in series or in parallel to the end of the open end of the power transmission open coil or the power reception open coil, so that the power transmission open coil or the power reception open coil may be configured to further lower the resonance frequency of the .

(f) Sixth embodiment
Next, a sixth embodiment of the present invention will be described with reference to FIGS. 46 to 52. FIG.
(I) Regarding the overall configuration and operation of the power transmission system of the sixth embodiment
Since the overall configuration and operation of the power transmission system of the sixth embodiment are basically the same as the overall configuration and operation of the power transmission system S3 of the third embodiment, detailed description thereof will be omitted.

(II) Configuration of the power transmitting coil (power receiving coil) of the sixth embodiment
Next, configurations of the power transmission coil and the power reception coil of the sixth embodiment, which are used in the power transmission system of the sixth embodiment, will be described with reference to FIGS. 46 to 50. FIG. Note that the power transmitting coil and the power receiving coil of the sixth embodiment basically have the same configuration. That is, the configuration of the power transmitting loop coil of the sixth embodiment and the configuration of the power receiving loop coil of the sixth embodiment are basically the same. Also, the configuration of the power transmission open coil of the sixth embodiment and the configuration of the power reception open coil of the sixth embodiment are basically the same. Furthermore, the positional relationship in the power transmission coil of the sixth embodiment between the power transmission loop coil of the sixth embodiment and the power transmission open coil of the sixth embodiment, the power reception loop coil of the sixth embodiment and the power reception open coil of the sixth embodiment The positional relationship with the coil in the power receiving coil of the sixth embodiment is basically the same. Therefore, in the following description, the structure of the power transmission coil of the sixth embodiment will be described. 46 to 49 are plan views respectively showing the structure of the power transmission coil of the sixth embodiment, and FIG. 50 is a partial cross-sectional view showing the structure of the power transmission coil of the sixth embodiment. 46 to 49 are plan views of the power transmission coil of the sixth embodiment when viewed from the power transmission unit side of the sixth embodiment in the power transmission device of the sixth embodiment.

As shown in the plan view of FIG. 46, in the power transmission coil of the sixth embodiment, the power transmission loop coil TL6 of the sixth embodiment and the power transmission open coil of the sixth embodiment, not shown in FIG. 46 are laminated in the paper surface direction of FIG. 46 via the film BF6-1. In addition, the power transmission open coil of the sixth embodiment is configured by laminating two coils CL6-1 and CL6-2, which will be described later, in the paper surface direction of FIG. 46 via an insulating film BF6-2. . Note that the centers of the windings of the copper thin film wires, which will be described later, which respectively constitute the power transmission loop coil TL6, the coil CL6-1, and the coil CL6-2 are the same or substantially the same.

As shown in FIG. 46, the power transmission loop coil TL6 has a connection terminal O6-1 and a connection terminal O6-2, which are connected to the power transmission section of the sixth embodiment, on one side of its outermost peripheral portion. there is The power transmission loop coil TL6 is formed by, for example, winding a copper thin film wire one turn, and both ends thereof (in the case shown in FIG. 46, the center of the right side portion) are the connection terminal O6-1 and the connection terminal O6-1. A terminal O6-2 is provided. The copper thin film wire forming the power transmission loop coil TL6 has the same width and the same thickness over the entire circumference of the power transmission loop coil TL6. Furthermore, in the power transmission loop coil TL6, straight lines are provided on each of the upper side, lower side, left side, and right side in FIG. 46, and the straight lines are connected by curved lines. The width of the copper thin film wire forming the power transmission loop coil TL6 will be described in detail later.

Next, the configuration of the coil CL6-1 constituting the power transmission open coil of the sixth embodiment, which is laminated directly below the power transmission loop coil TL6 via the film BF6-1, will be described using FIG. . FIG. 47 is a plan view showing only the coil CL6-1.

As shown in FIG. 47, the coil CL6-1 constituting the power transmitting open coil of the sixth embodiment has an open end T6-1 at the outermost peripheral portion. The coil CL6-1 is configured by, for example, a copper thin film wire spirally wound three and a half turns counterclockwise starting from the open end T6-1, from the outermost periphery toward the innermost periphery. ing. A via V6 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL6-2 which is laminated directly under it in the paper surface direction of FIG. The copper thin film wire forming the coil CL6-1 has the same width and thickness over the entire circumference of the coil CL6-1. Furthermore, in the coil CL6-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

Next, the configuration of the coil CL6-2 laminated directly below the coil CL6-1 via the film BF6-2 will be described with reference to FIG. FIG. 48 is a plan view showing only the coil CL6-2.

As shown in FIG. 48, the coil CL6-2, which together with the coil CL6-1 constitutes the power transmission open coil of the sixth embodiment, is electrically connected to the coil CL6-1 at its innermost circumference. is connected to the via V6 for That is, the coil CL6-1 and the coil CL6-2 are connected in series. Then, the coil CL6-2 rotates clockwise (that is, in the direction opposite to the coil CL6-1) starting from the via V6, from its innermost periphery to its outermost periphery, similarly to the coil CL6-1, for example A copper thin film wire is spirally wound three and a half turns. Further, the outermost peripheral portion thereof is an open end T6-2. The copper thin film wire forming the coil CL6-2 has the same width and thickness over the entire circumference of the coil CL6-2, like the coil CL6-1. Furthermore, in the coil CL6-2, like the coil CL6-1, parallel straight lines are provided on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the positional relationship between the copper thin film wires forming the coil CL6-1 and the coil CL6-2 is as follows: The position of the copper thin film wire of the coil CL6-2 wound in the clockwise direction is aligned with the position of the copper thin film wire of the coil CL6-1 and the coil CL6-2 when viewed from the winding center of each copper thin film. Wire is wound. The coil CL6-1 and the coil CL6-2 are connected in series by the via V6 connected to the innermost circumference of each. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL6-1 is reversed (turned back) at the innermost peripheral portion in the opposite direction, so that the coil CL6-2 is turned from the innermost peripheral portion to the outermost peripheral portion. is wound to

Next, the positional relationship between the copper thin film wires constituting the power transmission loop coil TL6 and the power transmission open coil (that is, the coil CL6-1 and the coil CL6-2) of the sixth embodiment will be described with reference to FIG. do. FIG. 49 is a plan view showing how the power transmission loop coil TL6 and the coils CL6-1 and CL6-2 overlap. (illustration is omitted in )), the coils CL6-1 and CL6-2 of the power transmission open coil TO of the sixth embodiment are shown by dashed lines. As described above, the positional relationship between the copper thin film wires forming the coil CL6-1 and the coil CL6-2 are exactly the same in FIG.

As indicated by the dashed line in FIG. 49, the coil CL6-1 wound from the outer circumference to the inner circumference and connected to the coil CL6-2 by the via V6 at its innermost circumference has , and the thin film copper wire is wound such that each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire. On the other hand, as indicated by the solid line in FIG. 49, the power transmission loop coil T6 is laminated along the outer edge of the coil CL6-1, and the connection terminal O6-1 and the connection terminal O6-2 are arranged outside the winding. It has a protruding shape. As a result, the power transmission coil of the sixth embodiment, in which the power transmission loop coil TL6 and the power transmission open coils (coil CL6-1 and coil CL6-2) of the sixth embodiment are stacked, are vertically arranged as shown in FIG. On each of the left and right sides, the copper thin film wires forming the power transmission loop coil TL6 and the power transmission open coils (coil CL6-1 and coil CL6-2) of the sixth embodiment are laminated so as to overlap each other. At this time, the power transmission loop coil TL6 is positioned so as to overlap within the range of the width of the entire copper thin film wire that constitutes the power transmission open coil of the sixth embodiment (indicated by the symbol “W _TO ” in FIG. 49). there is

On the other hand, as shown in FIG. 49, the width W _TL of the copper thin film wire forming the power transmission loop coil TL6 is The power transmission loop coil TL6 is formed to be thicker than the pitch P _TO of the copper thin film wire (that is, the distance in the radial direction of the winding of the center line of the copper thin film wire). More specifically, the power transmission loop coil TL6 is formed such that the width _WTL is 1.5 times or more the pitch _PTO . Furthermore, as shown in FIG. 49, the width W _TL is equal to or less than the width W _TO of the entire copper thin film wire constituting the power transmission open coil of the sixth embodiment (that is, the width of the outermost edge of the power transmission open coil of the sixth embodiment). difference between the distance to the center of the power transmission coil of the sixth embodiment and the distance between the innermost edge of the power transmission open coil of the sixth embodiment and the center of the power transmission coil of the sixth embodiment).

Next, regarding the lamination state of the power transmission loop coil TL6, the coils CL6-1 and CL6-2, and the connection state of the coils CL6-1 and CL6-2, the cross section of the AA' portion shown in FIG. This will be explained using FIG. 50 as a diagram.

As shown in FIG. 50, on the left side of FIGS. 46 to 49, the coil CL6-1 and the coil CL6-2 are laminated with the film BF6-2 interposed therebetween, and electrically connected to each other by the via V6. ing. At the position of the via V6, the counterclockwise winding of the coil CL6-1 is cut back (folded back) to form the clockwise winding of the coil CL6-2. On the other hand, the power transmission open coil and the power transmission loop coil TL6 of the sixth embodiment composed of the coil CL6-1 and the coil CL6-2 are laminated with the film BF6-1 (see FIG. 46) interposed therebetween.

(III) About the method for manufacturing the power transmitting coil and the power receiving coil of the sixth embodiment
A method for manufacturing the power transmitting coil and the power receiving coil according to the sixth embodiment is basically the same as the method for manufacturing the power transmitting coil and the power receiving coil according to the fourth embodiment, and detailed description thereof will be omitted.

(IV) Sixth embodiment
Next, based on the results of experiments conducted by the inventors of the present application, the effect of performing power transmission using the power transmission system of the sixth embodiment including the power transmission coil and the power reception coil of the sixth embodiment will be described with reference to FIG. and FIG. 52 .

(1) 6-1 Example
First, an example of a simulation result of the effect when power transmission is performed using the power transmission system of the sixth embodiment is shown for the copper thin film wires that constitute the power transmission loop coil TL6 and the power reception loop coil of the sixth embodiment, respectively. A case where only the width is changed will be described with reference to FIG. In the following description, the copper thin film wires constituting the power transmitting loop coil TL6 and the power receiving loop coil of the sixth embodiment are simply referred to as "loop coil copper thin film wires". A copper thin film wire forming each open coil is simply referred to as an "open coil copper thin film wire". FIG. 51(a) is a diagram showing the relationship between the resonance frequency as the effect and the value of the S parameter (S11) related to reflectance, and FIG. 51(b) is the resonance frequency as the effect and the transmission FIG. 4 is a diagram showing the relationship with the value of an S parameter (S21) related to efficiency; In each of FIGS. 51(a) and 51(b), the graphs containing ▪ show the respective relationships when the width of the loop coil copper thin film wire is 4 mm, and the graphs containing ♦ show the loop coil Each relationship is shown when the width of the copper thin film line is 2 millimeters. Further, the specifications other than the width of the loop coil copper thin film wire are as follows for each of FIGS. 51(a) and 51(b).
External dimensions of the power transmitting open coil of the sixth embodiment, the power receiving open coil of the sixth embodiment, the power transmitting loop coil of the sixth embodiment, and the power receiving loop coil of the sixth embodiment on the plane shown in FIGS. 46 to 49: Approximately 150 mm long x 150 mm wide ・Thickness of open coil copper thin film wire and loop coil copper thin film wire: all the same ・Number of turns of open coil copper thin film wire: 3.5 turns (3.5 turns) (Fig. 47 to 49)
・Width of open coil copper thin film wire: 1.7 mm ・Out of open coil copper thin film wire, the distance between the center lines of adjacent copper thin film wires (pitch P _TO ): 2.0 mm And Fig. 51(a) and FIG. 51(b) , when the width of the copper thin film wire constituting each of the power transmitting loop coil TL6 and the power receiving loop coil of the sixth embodiment is increased, resonance The frequency can be made lower. Also, as shown in FIGS. 51(a) and 51(b), overall high transmission efficiency is obtained at the resonance frequency.

(2) 6-2 Example
Next, as another example of the simulation result of the effect when power transmission is performed using the power transmission system of the sixth embodiment, the relationship between the width of the loop coil copper thin film wire and the resonance frequency is shown in FIG. to explain. Note that FIG. 52 shows the relationship between the width of the loop coil thin film copper wire and the resonance frequency as another example, in terms of the overall width of one side of the open coil thin film copper wire (that is, the outermost edge of the open coil thin film copper wire and the first The distance from the central axis of the power transmission open coil of the sixth embodiment (the power transmission coil of the sixth embodiment) or the power reception open coil of the sixth embodiment (the power reception coil of the sixth embodiment) and the maximum distance of the open coil copper thin film wire 49 is a graph showing the relationship between the difference between the distance between the inner edge portion and the center axis, and the difference (see FIG. 49 symbol “W _TO ”). In FIG. 52, the specifications other than the width of the loop coil copper thin film wire are the same as in the case of the above embodiment 6-1. Furthermore, in FIG. 52, the “open coil copper thin film line width” is the portion where three open coil copper thin film wires are parallel (for example, the coil CL6-1 shown in FIG. 47 and the coil CL6-2 shown in FIG. 47 and 48 (below the center of each of the left side and right side and the lower side) is 6 mm. (For example, the coil CL6-1 shown in FIG. 47 and the coil CL6-2 shown in FIG. 48, respectively, above the center and upper side of the left side and right side in FIGS. 47 and 48) are 8 mm It is shown that.

As shown in FIG. 52, when the width of the loop coil copper thin film wire of the sixth embodiment is changed, the total width of the copper thin film wire on each side of the power transmission open coil and the power reception open coil of the sixth embodiment is larger than the total width of the copper thin film wire. In the narrow range, the resonance frequency can be lowered as the width of the loop coil copper thin film wire is increased. On the other hand, if the width of the loop coil copper thin film wire is equal to or greater than the total width of the copper thin film wire on each side of the power transmission open coil and the power reception open coil of the sixth embodiment, this will lead to a reduction in the resonance frequency. appears to make little contribution.

The effect of lowering the resonance frequency by increasing the width of the loop coil copper thin film wire as described above is that the width is increased, which is different from the power transmission open coil or the power reception open coil of the sixth embodiment. It is considered that the parasitic capacitance between 1 and 2 increases, thereby lowering the resonance frequency.

As described above, according to power transmission using the power transmission system of the sixth embodiment including the power transmission coil and the power reception coil of the sixth embodiment, the power transmission coil and the power transmission coil of the sixth embodiment of the loop coil copper thin film wire The position in the radial direction of the receiving coil is between the outermost edge and the innermost edge of the winding of the open coil copper thin film wire (see FIG. 49), and the width of the loop coil thin copper thin film wire is the width of the open coil thin copper thin film wire. Since the winding pitch is wider than the pitch of the winding, the resonance frequency as the power transmission coil or the power reception coil of the sixth embodiment is lowered due to the increase in the parasitic capacitance between the open coil thin copper film wire and the loop coil thin copper film wire. be able to.

Therefore, when adjusting the resonance frequency of the power transmitting coil or the power receiving coil of the sixth embodiment, the length of each copper thin film wire can be shortened, and power loss and heat generation due to the electrical resistance of each copper thin film wire can be suppressed. be able to.

In addition, since the width of the loop coil thin copper film wire is equal to or less than the overall width of one side of the winding of the open coil thin copper film wire, the effective area of the power transmitting loop coil TL6 or the power receiving loop coil of the sixth embodiment as a whole becomes small. While preventing this, the resonance frequencies of the power transmitting coil and the power receiving coil of the sixth embodiment can be lowered.

Furthermore, since the width of the loop coil copper thin film wire is 1.5 times or more the radial interval of the open coil thin copper film wire in the power transmitting open coil or the power receiving open coil of the sixth embodiment, the open coil copper thin film wire and the The parasitic capacitance between the loop coil copper thin film wire can be effectively increased.

Furthermore, the open coil copper thin film wire is a thin film wire that is flat in the radial direction of the power transmission open coil or the power reception open coil of the sixth embodiment, and the loop coil winding line is the power transmission loop coil TL6 of the sixth embodiment or the sixth embodiment. Since the thin film wire is flat in the radial direction of the power receiving loop coil of the embodiment, parasitics between the power transmitting open coil and the power transmitting loop coil TL6 in the sixth embodiment and between the power receiving open coil and the power receiving loop coil in the sixth embodiment are reduced. By increasing the capacity, it is possible to further reduce the resonance frequency of the power transmitting coil and the power receiving coil of the sixth embodiment.

In the sixth embodiment and each example described above, the parasitic capacitance that contributes to lowering the resonance frequency is the parasitic capacitance between the power transmission open coil and the power transmission loop coil TL6 of the sixth embodiment, The configuration is such that the parasitic capacitances between the power receiving open coil and the power receiving loop coil of the sixth embodiment are adjusted respectively. However, in addition to this, either the open end T6-1 or the open end T6-2 of the power transmission open coil of the sixth embodiment and/or the open end T6-1 or the open end of the power reception open coil of the sixth embodiment A capacitor may be further connected in series or parallel to either T6-2 or via V6 to adjust the resonance frequency. Further, a capacitor may be further connected in parallel to either the connection terminal O6-1 or the connection terminal O6-2 of the power transmission loop coil TL6 to further adjust the parasitic capacitance.

(g) Seventh embodiment
Next, a seventh embodiment of the present invention will be described with reference to FIGS. 53 to 58. FIG.
(I) Regarding the overall configuration and operation of the power transmission system of the seventh embodiment
First, the overall configuration and operation of the power transmission system of the seventh embodiment will be described using FIG. Note that FIG. 53 is a block diagram showing a schematic configuration of the power transmission system of the seventh embodiment.

As shown in FIG. 53, the power transmission system S7 of the seventh embodiment includes a power receiving device R7 including the same power receiving unit RV as in the third embodiment and the power receiving coil RC7 of the seventh embodiment, and It is composed of a similar power transmission unit TR and a power transmission device T7 including the power transmission coil TC7 of the seventh embodiment. At this time, the power receiving device R7 is mounted on the electric vehicle and is connected to a storage battery (not shown) mounted on the electric vehicle. On the other hand, the power transmission device T7 is installed on the ground at a position where the electric vehicle moves or stops. When charging the storage battery, the electric vehicle is driven or stopped so that the power receiving coil RC7 of the power receiving device R7 and the power transmitting coil TC7 of the power transmitting device T7 face each other.

On the other hand, the power transmission coil TC7 includes a power transmission loop coil TL7 and a power transmission open coil TCL7. The power receiving coil RC7 includes a power receiving open coil RCL7 and a power receiving loop coil RL7. At this time, power to be transmitted is input from the power transmission unit TR to the power transmission loop coil TL7. The power transmission open coil TCL7 is concentrically laminated with respect to the power transmission loop coil TL7, and both ends thereof are open. On the other hand, the power receiving open coil RCL7 is laminated so as to face the power transmitting open coil TCL7 and has open ends. The power receiving loop coil RL7 is concentrically laminated with respect to the power receiving open coil RCL7, and outputs the power received from the power transmitting coil TC7 by the magnetic resonance method to the power receiving unit RV via the power receiving open coil RCL7.

In the above configuration, the power transmission unit TR of the power transmission device T7 outputs power to be transmitted to the power reception device R7 to the power transmission coil TC while complying with regulations such as the Radio Law of the country where the power transmission system S7 is used. .

On the other hand, the power receiving coil RC7 of the power receiving device R7 that has received power from the power transmitting coil TC7 by the magnetic field resonance method outputs the received power to the power receiving unit RV. As a result, the power receiving unit RV converts an output corresponding to the power (for example, high frequency power of 85 kHz) into a DC (direct current) current by a power conversion unit (not shown), for example, and outputs it to the storage battery of the electric vehicle. As a result, the storage battery is charged with the necessary amount of electric power.

(II) Configuration of power transmitting coil TC7 (power receiving coil RC7)
Next, configurations of the power transmission coil TC7 and the power reception coil RC7 of the seventh embodiment, which are used in the power transmission system S7 of the seventh embodiment described above, will be described with reference to FIGS. 54 to 57. FIG. Note that the power transmission coil TC7 and the power reception coil RC7 of the seventh embodiment basically have the same configuration. That is, the configuration of the power transmission loop coil TL7 and the configuration of the power reception loop coil RL7 are basically the same. Further, the configuration of the power transmission open coil TCL7 and the configuration of the power reception open coil RCL7 are basically the same. Further, the positional relationship in the power transmitting coil TC7 between the power transmitting loop coil TL7 and the power transmitting open coil TCL7 and the positional relationship in the power receiving coil RC7 between the power receiving loop coil RL7 and the power receiving open coil RCL7 are basically are identical. Therefore, in the following description, the structure of the power transmitting coil TC7 will be described. 54 to 56 are plan views showing the structure of the power transmission coil TC7 of the embodiment, and FIG. 57 is a partial cross-sectional view showing the structure of the power transmission coil TC7 of the embodiment. 54 to 56 are plan views of the power transmission coil TC7 viewed from the power transmission unit TR side in the power transmission device T7.

As shown in the plan view of FIG. 54, in the power transmission coil TC7 of the seventh embodiment, a power transmission loop coil TL7 and a power transmission open coil TCL7 not shown in FIG. are stacked in the paper surface direction. Further, the centers of the windings of the copper thin film wires, which will be described later, constituting the power transmission loop coil TL7 and the power transmission open coil TCL7, respectively, are the same or substantially the same.

As shown in FIG. 54, the power transmission loop coil TL7 has a connection terminal O7-1 and a connection terminal O7-2 connected to the power transmission section TR on one side of the outermost peripheral portion thereof. The power transmission loop coil TL7 is formed by, for example, winding a copper thin film wire one turn (one turn), and both ends thereof (in the case shown in FIG. 54, the center of the right side portion) are connected to the connection terminals O7-1. and the connection terminal O7-2. The copper thin-film wire forming the power transmission loop coil TL7 has the same width and thickness over the entire circumference of the power transmission loop coil TL7. Furthermore, in the power transmission loop coil TL7, straight lines are provided on each of the upper side, lower side, left side, and right side in FIG. 54, and the respective straight lines are connected by curved lines.

Next, the configuration of the power transmission open coil TCL7, which is laminated directly below the power transmission loop coil TL7 via the film BF7, will be described with reference to FIG. Note that FIG. 55 is a plan view showing only the power transmission open coil TCL7.

As shown in FIG. 55, the power transmission open coil TCL7 has an open end T7-1 at its outermost periphery and an open end T7-2 at its innermost periphery. Then, the power transmission open coil TCL7 is counterclockwise starting from the open end T7-1, and the copper thin film wire is spirally wound five and a half turns (5.5 turns) from the outermost circumference to the innermost circumference. It is configured to be wound, and the end of the winding is the open end T7-2. The copper thin film wire forming the power transmission open coil TCL7 has the same thickness over the entire circumference. Furthermore, in the power transmission open coil TCL7, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is

On the other hand, as shown in FIG. 55, the width of the thin copper film wire constituting the power transmission open coil TCL7 of the seventh embodiment is such that it is laminated at a position facing the power transmission loop coil TL7 in the power transmission coil TC7 of the embodiment. The width of the copper thin film line (indicated by the symbol “W1” in FIG. 55 and FIG. 56 described later) is the width of the copper thin film line to be laminated at a position other than the facing position (in FIGS. 55 and 56 indicated by the symbol "WW1"). In addition, in the case illustrated in FIG. 55, the width of the copper thin film wire that constitutes the power transmission loop coil TL7 that is concentrically laminated and the positional relationship with the copper thin film wire, the copper for two wires near the inner circumference of the power transmission open coil TCL7 The width W1 of the thin film line is wider than the width WW1 of the copper thin film line at other locations (see FIG. 56 described later).

Next, the positional relationship between the copper thin film wires forming the power transmission loop coil TL7 and the power transmission open coil TCL7 will be described with reference to FIG. Note that FIG. 56 is a plan view showing the overlapping state of the power transmission loop coil TL7 and the power transmission open coil TCL7. ) are indicated by dashed lines.

As shown by the dashed line in FIG. 56, the power transmission open coil TCL7, which is wound from the outer circumference to the inner circumference and has an open end T7-1 and an open end T7-2 at both ends, has a quarter turn. Each curved part is formed and the thin copper film wire is wound so that the position of the straight part is shifted to the inner peripheral side by a quarter of the winding pitch of the thin copper film wire. On the other hand, as shown by the solid line in FIG. 56, the power transmission loop coil TL7 is laminated along the inner periphery of the power transmission open coil TCL7, and the connection terminal O7-1 and the connection terminal O7-2 are stacked. are shaped so as to protrude outward from the windings. As described above, in the power transmission open coil TCL7 shown in FIG. It is wider than the width WW1 of the copper thin film wire to be laminated.

As shown in FIG. 56 above, in the power transmission coil TC7 in which the power transmission loop coil TL7 and the power transmission open coil TCL7 are stacked, each of the copper coils constituting the power transmission loop coil TL7 and the power transmission open coil TCL7 The thin film lines are laminated so as to substantially overlap each other.

Next, the lamination state of the power transmission loop coil TL7 and the power transmission open coil TCL7 will be described with reference to FIG. 57 as a cross-sectional view taken along line A-A' shown in FIGS.

As shown in FIG. 57, on the left side of FIGS. 54 to 56, a power transmission loop coil TL7 and a power transmission open coil TCL7 are laminated with a film BF7 interposed therebetween, and one end of the power transmission open coil TCL7 is an open end. It is designated as T7-2.

(III) Manufacturing method of power transmitting coil TC7 and power receiving coil RC7
Next, a method for manufacturing the power transmitting coil TC7 and the power receiving coil RC7 of the seventh embodiment will be described.

As the manufacturing method, a manufacturing method including each of the following (a) to (e), which is basically the same as the conventional one, can be used.
(a): Form a copper thin film on both sides of the film BF7. (b): Apply a resist on each of the copper thin films (both sides) formed in (a) above. (c): Resist applied in (b) above. are patterned on the copper thin-film wires of the power transmission loop coil TL7 and the power transmission open coil TCL7 on each surface (at this time, as described above, among the copper thin-film wires that constitute the power transmission open coil TCL7 of the embodiment, the power transmission loop coil TL7 Patterning is performed so that the width of the copper thin film line to be laminated at the opposing position closer to the inner periphery is wider than the width of the copper thin film line to be laminated at a position other than the opposing position. )
(d): Etching is performed after the patterning of (c) above to form copper thin film wires as the power transmission loop coil TL7 and the power transmission open coil TCL7, respectively. (e): The connection terminal O7-1 and the connection of the power transmission loop coil TL7. terminal O7-2 and the power transmission unit TR (in the case of the power transmission device T7) or the power reception unit RV (in the case of the power reception device R7).

(IV) Seventh embodiment
Next, based on the results of experiments conducted by the inventors of the present application, the effect of performing power transmission using the power transmission system S7 of the seventh embodiment including the power transmission coil TC7 and the power reception coil RC7 of the seventh embodiment will be discussed. , will be described with reference to FIG. FIG. 58 is a diagram showing the relationship between the numbers of copper thin film wires and the current density as an effect of the coil structure of the seventh embodiment.

Here, the number of windings of the power transmission open coil TCL7 or the power reception open coil RCL7 that produces the effect shown in FIG. 58 is five and a half turns (5.5 turns) as described later. 58 corresponding to the structure of the power transmission open coil TCL7 or the power reception open coil RCL7 refers to the open end T7-1 and the open end T7- of the power transmission open coil TCL7 or the power reception open coil RCL7. 2 (because the number of windings is five and a half turns, the number of copper thin film wires is 12), for example, the transmission open coil TCL7 shown in FIG. The number of the copper thin film line arranged in the outermost periphery on the open end T7-2 side is "1", and the number of the copper thin film line at the position of the open end T7-2 is "6". The number of the copper thin film wires lined up on the innermost circumference on the open end T7-1 side of the power transmission open coil TCL7 is "6", and the number of the copper thin film wires lined up on the outermost circumference on the open end T7-1 side is "1". , and are numbered in this order. That is, in the power transmission open coil TCL7 shown in FIG. 55, "1" (open Copper thin film line lined up on the outermost periphery on the end T7-2 side) → "6" (copper thin film line at the position of the open end T7-2) → "6" (On the innermost periphery on the open end T7-1 side 58 are the copper thin film wire numbers shown in FIG. The structural specifications of each of the power transmitting open coil TCL7 and the power receiving open coil RCL7 of the seventh embodiment from which the experimental results shown in FIG. 58 were obtained are as follows.
54 to 56 of the power transmitting open coil TCL7 and the power receiving open coil RCL7: about 100 mm long x about 100 mm wide The thickness of the copper thin film wire of the power transmitting open coil TCL7: all constant and the same - The number of turns of the copper thin film wire of the power transmission open coil TCL7: Five and a half turns - The width of the copper thin film wire of the power transmission open coil TCL7: 5 millimeters at the part laminated at the position corresponding to the power transmission loop coil TL7. 1.5mm in the other transmission open coil TCL7 part.

On the other hand, the structural specifications of each open coil (an open coil stacked on a loop coil to constitute a power transmission open coil or a power reception open coil as a conventional example) for which the experimental results shown in FIG. 58 as a "conventional example" were obtained They are as follows. The positional relationship between the loop coil and the open coil in each of the power transmitting open coil and the power receiving open coil as the conventional example is the same as that of the power transmitting coil TC7 and the power receiving coil RC7 of the seventh embodiment (see FIG. 56).
・External dimensions of conventional open coil: Approximately 100 mm long x Approximately 100 mm wide ・Thickness of open coil copper thin film wire as conventional example: all uniform and identical ・Copper thin film wire for each coil as conventional example Number of turns: Five and a half turns Width of copper thin film wire for each coil as a conventional example: Constant at 1.5 mm from the innermost peripheral end to the outermost peripheral end As shown in FIG. In the case of the seventh embodiment (indicated by the "■" mark in FIG. 58), the current density is prominently increased at the position facing the loop coil, whereas in the seventh embodiment (indicated by the "♦" mark in ) does not have such a tendency, and equalization of the current density is realized over the entire power transmission open coil TCL7.

As described above, according to the power transmission using the power transmission system S7 including the power transmission coil TC7 and the power reception coil RC7 of the seventh embodiment, the copper thin film wire constituting the power transmission open coil TCL7 (the power reception open coil RCL7) Width W1 of the copper thin film wire of the power transmission open coil TCL7 (power reception open coil RCL7) laminated at a position facing the power transmission loop coil TL7 (power reception loop coil RL7) configured by a copper thin film wire having a width greater than the width is Since it is wider than the width WW1 of the copper thin film wire of the power transmission open coil TCL7 (receiving open coil RCL7) other than the copper thin film wire laminated at the position facing each other, the width of the copper thin film wire at the position where the current density is high is relatively By increasing the current density, the current density is leveled by the power transmission open coil TCL7 (power reception open coil RCL7) to improve the degree of freedom of placement as the power transmission coil TC7 (power reception coil RC7) and the utilization efficiency of copper, which is the material of the copper thin film wire. In addition, the heat generation of the power transmission coil TC7 (the power reception coil RC7) can be suppressed.

In addition, the width of the copper thin film wire of the power transmission open coil TCL7 (power reception open coil RCL7) laminated at the position facing the power transmission loop coil TL7 (power reception loop coil RL7) is made larger than the width of the copper thin film wire at other positions. Since it is wide, it is possible to level the current density while simplifying the manufacturing process of the power transmitting coil TC7 (power receiving coil RC7).

Furthermore, since each of the copper thin film wires constituting the power transmission open coil TCL7 and the power transmission loop coil TL7 (the power reception open coil RCL7 and the power reception loop coil RL7) is a flat copper thin film wire in the radial direction of the power transmission coil TC7 (the power reception coil RC7) , the resonance frequency of the power transmitting coil TC7 (power receiving coil RC7) as a whole can be adjusted by effectively utilizing the parasitic capacitance between the copper thin film wires.

In the seventh embodiment described above, the cross-sectional area of the copper thin film wire constituting the power transmission open coil TCL 7 is changed by changing the width while keeping the thickness of the copper thin film wire constant, but other than this. Then, among the copper thin-film wires constituting the power transmission open coil, the thickness of the copper thin-film wire that will be laminated at a position closer to the inner circumference facing the power transmission loop coil TL7 is laminated at a position other than the facing position. It may be configured to be thicker than the thickness of the copper thin film wire to be formed. Even in this case, like the power transmission open coil TCL7 of the embodiment, the current density can be leveled while simplifying the manufacturing process of the power transmission coil TC7 (power reception coil RC7).

Further, in the seventh embodiment described above, the present invention is applied to the power transmission open coil TCL7 (power reception open coil RCL7) composed of a coil wound in one layer as the power transmission open coil TCL7 (power reception open coil RCL7). In addition to this, in the power transmitting open coil (power receiving open coil) composed of coils wound over a plurality of layers, the coils of each layer may be laminated at a position facing the power transmitting loop coil (power receiving loop coil). The width or thickness of the copper thin film wires to be different may be made wider or thicker than the width or thickness of the copper thin film wires to be laminated at positions other than the facing position.

Furthermore, in the above-described embodiment, capacitors are further connected in series or parallel to the ends of the power transmitting open coil TCL7 or the power receiving open coil RCL7, which are the open ends T7-1 and T7-2. The open coil TCL7 or the power receiving open coil RCL7 may be configured to lower the resonance frequency.

(h) Eighth embodiment
Next, an eighth embodiment of the present invention will be described with reference to FIGS. 59 to 68. FIG.
(I) Regarding the overall configuration and operation of the power transmission system of the eighth embodiment
Since the overall configuration and operation of the power transmission system of the eighth embodiment are basically the same as the overall configuration and operation of the power transmission system S3 of the third embodiment, detailed description thereof will be omitted.

(II) Concerning the configuration of the power transmitting coil (power receiving coil) of the eighth embodiment
Next, configurations of the power transmitting coil and the power receiving coil of the eighth embodiment, which are used in the power transmission system of the eighth embodiment, will be described with reference to FIGS. 59 to 65. FIG. Note that the power transmitting coil and the power receiving coil of the eighth embodiment basically have the same configuration. That is, the configuration of the power transmitting loop coil of the eighth embodiment and the configuration of the power receiving loop coil of the eighth embodiment are basically the same. Also, the configuration of the power transmission open coil of the eighth embodiment and the configuration of the power reception open coil of the eighth embodiment are basically the same. Furthermore, the positional relationship in the power transmission coil of the eighth embodiment between the power transmission loop coil of the eighth embodiment and the power transmission open coil of the eighth embodiment, the power reception loop coil of the eighth embodiment and the power reception open coil of the eighth embodiment The positional relationship with the coil in the power receiving coil of the eighth embodiment is basically the same. Therefore, in the following description, the structure of the power transmission coil of the eighth embodiment will be described. 59 to 63 are plan views showing the structure of the power transmission coil of the eighth embodiment, and FIGS. 64 and 65 are partial cross-sectional views showing the structure of the power transmission coil of the eighth embodiment. 59 to 63 are plan views of the power transmission coil of the eighth embodiment viewed from the power transmission unit side of the eighth embodiment in the power transmission device of the eighth embodiment.

As shown in the plan view of FIG. 59, the power transmission coil of the eighth embodiment includes a power transmission loop coil TL8 and a power transmission open coil of the eighth embodiment not shown in FIG. ) is used to fix its shape and position, and it is laminated in the paper surface direction of FIG. 59 . Further, in the power transmission open coil of the eighth embodiment, two coils CL8-1 and CL8-2, which will be described later, are fixed in shape and position using the dielectric MM, respectively, in the direction of the paper surface of FIG. It is constructed by stacking. Here, in the eighth embodiment, the dielectric MM is used for insulation between the power transmission loop coil TL8 and the power transmission open coil of the eighth embodiment, and for insulation between the coil CL8-1 and the coil CL8-2. Specific examples of materials for the dielectric MM include PET, glass-particle-dispersed epoxy resin (hereinafter simply referred to as "glass-epoxy resin"), ceramic-particle-dispersed epoxy resin, fluorine resin material, and the like. can be used. At this time, if a ceramic particle-dispersed epoxy resin is used as the dielectric MM, for example, the heat generated by the power transmission coil of the eighth embodiment can be efficiently dissipated. Furthermore, the winding centers of the copper thin film wires, which will be described later and which respectively constitute the power transmission loop coil TL8, the coil CL8-1, and the coil CL8-2, are the same or substantially the same.

Then, as shown in FIG. 59, the power transmission loop coil TL8 is insulated from each other at the center of one side (the right side in the case shown in FIG. 59), for example, by using a jumper wire or the like so as to extend vertically (that is, For example, a copper thin film wire is wound twice (two turns) so as to intersect in the direction perpendicular to the paper surface. Further, in the power transmission loop coil TL8, linear portions are provided in each of the upper, lower, left, and right side portions in FIG. 59, and the respective linear portions are connected by curved portions. Furthermore, both ends of the thin copper wire that constitutes the power transmission loop coil TL8 are placed at a specific position (above the crossing position of the right side in the case shown in FIG. 59) in the winding on the outer peripheral side. A connection terminal O8-1 and a connection terminal O8-2 are connected to the . Furthermore, the position of the thin copper film wire in the radial direction of the power transmission coil of the eighth embodiment corresponds to the outermost and innermost peripheral portions of the coil CL8-1 and the coil CL8-2, respectively, which will be described later. there is Further, the copper thin film wire has the same width and the same thickness over the entire circumference of the power transmission loop coil TL8. Note that the cross section of the B-B' portion shown in FIG. 59 will be described later in detail with reference to FIG.

Next, the configuration of the coil CL8-1 that constitutes the power transmission open coil of the eighth embodiment, which is stacked directly below the power transmission loop coil TL8 via the dielectric MM, will be described with reference to FIG. FIG. 60 is a plan view showing only the coil CL8-1.

As shown in FIG. 60, the coil CL8-1 that constitutes the power transmission open coil of the eighth embodiment has an open end T8-1 at the outermost peripheral portion thereof. Then, the coil CL8-1 is counterclockwise starting from the open end T8-1, and from the outermost peripheral portion to the innermost peripheral portion, for example, the copper thin film wire spirals three and a half turns (3.5 turns). It is configured by winding. A via V8 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL8-2 which is laminated directly under it in the paper surface direction of FIG. The copper thin film wire forming the coil CL8-1 has the same width and thickness over the entire circumference of the coil CL8-1. Furthermore, in the coil CL8-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is Also, the horizontal length H _CL1 and vertical length V _CL1 of the entire coil CL8-1 in FIG. 60 correspond to the horizontal length H _TL and vertical length V _TL of the entire power transmission loop coil TL8 in FIG. They are approximately the same. Furthermore, the width of one side of the coil CL8-1 (the width of one side including three or four copper thin film wires forming the coil CL8-1) W _CL1 is equal to the width W _TL of one side of the power transmission loop coil TL8 in FIG. Almost match.

Next, the configuration of the coil CL8-2 layered directly below the coil CL8-1 via the dielectric MM will be described with reference to FIG. FIG. 61 is a plan view showing only the coil CL8-2.

As shown in FIG. 61, the coil CL8-2, which together with the coil CL8-1 constitutes the power transmission open coil of the eighth embodiment, has an electrical connection with the coil CL8-1 at its innermost circumference. is connected to the via V8 for That is, the coil CL8-1 and the coil CL8-2 are connected in series. Then, the coil CL8-2 starts from the via V8 and rotates clockwise (that is, in the opposite direction to the coil CL8-1) from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirally. It is wound seven and a half turns (7.5 turns). Further, the outermost peripheral portion thereof is an open end T8-2. The copper thin film wire forming the coil CL8-2 has the same width and thickness over the entire circumference of the coil CL8-2. Furthermore, in the coil CL8-2, as in the coil CL8-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve. Further, the horizontal length H _CL2 and the vertical length V _CL2 of the entire coil CL8-2 in FIG. 61 correspond to the horizontal length H CL2 of the entire power transmission loop coil TL8 in FIG. _TL and the vertical length _VTL are substantially matched. Furthermore, the width of one side of the coil CL8-2 (the width of one side including three or four copper thin film wires forming the coil CL8-2) W _CL2 is the width of the power transmission loop coil TL8, similarly to the coil CL8-1. It substantially matches the width _WTL of one side in FIG.

Here, the relationship between the copper thin film wires constituting the coil CL8-1 and the coil CL8-2 is the number of turns of the copper thin film wire of the coil CL8-1 wound counterclockwise (three Each copper thin film wire is wound such that the number of turns (seven and a half turns) of the copper thin film wire of the coil CL8-2 wound clockwise is different from the number of turns (seven and a half turns) of the copper thin film wire. At this time, the copper thin film wire of the coil CL8-1 and the copper thin film wire of the coil CL8-2 are different in the number of turns, so that the copper thin film wire of the coil CL8-1 is formed as shown in FIGS. The width of one wire is wider than the width of one copper thin film wire of the coil CL8-2. The coil CL8-1 and the coil CL8-2 are connected in series by the via V8 connected to the innermost circumference of each. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL8-1 is reversed (turned back) at the innermost peripheral portion in the opposite direction, so that the coil CL8-2 is wound from the innermost peripheral portion to the outermost peripheral portion. is wound to

Next, referring to FIGS. 62 and 63, the positional relationship between the copper thin-film wires respectively constituting the power transmission loop coil TL8 and the power transmission open coil (that is, the coil CL8-1 and the coil CL8-2) of the eighth embodiment. will be used for explanation. Note that FIG. 62 is a plan view showing the overlapping state of the power transmission loop coil TL8 and the coil CL8-1. The coils CL8-1 of the power transmission open coils of the eighth embodiment, which are stacked via the coils CL8-1, are indicated by dashed lines. Further, FIG. 63 is a plan view showing the overlapping state of the coil CL8-1 and the coil CL8-2 of the power transmission open coil of the eighth embodiment. (illustration is omitted in FIG. 63) are indicated by dashed lines.

As indicated by the dashed line in FIG. 62, the coil CL8-1 wound from the outer circumference to the inner circumference and connected to the coil CL8-2 by the via V8 at its innermost circumference has , and the thin film copper wire is wound such that each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire. On the other hand, as shown by the solid line in FIG. 62, the thin copper wire (which is wound twice as shown in FIG. 59) that constitutes the power transmission loop coil TL8 is the coil CL8-1 except for the intersection position shown in FIG. are laminated along the outer edge and the inner edge of the winding, respectively, and the connecting terminal O8-1 and the connecting terminal O8-2 are shaped to protrude to the outside of the winding.

Next, as shown by the dashed line in FIG. 63, the coil CL8-2 wound from the inner circumference to the outer circumference and connected to the coil CL8-1 by the via V8 at the innermost circumference also has a quarter turn. Each curved portion is formed and the thin copper film wire is wound such that the position of the straight portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire. On the other hand, as indicated by the solid line in FIG. 63, the coil CL8-1 is laminated along the outer edge of the coil CL8-2, and they are connected in series by the via V8.

As shown in FIGS. 62 and 63 above, in the power transmission coil of the eighth embodiment in which the power transmission loop coil TL8 and the coil CL8-1 and the coil CL8-2 of the power transmission open coil of the eighth embodiment are stacked, On the top, bottom, left, and right sides, the copper thin-film wires forming the power transmission loop coil TL8 and the power transmission open coils (coil CL8-1 and coil CL8-2) of the eighth embodiment are laminated so as to overlap each other.

Next, regarding the lamination state of the power transmission loop coil TL8, the coil CL8-1 and the coil CL8-2, and the connection state of the coil CL8-1 and the coil CL8-2, the power transmission loop coil TL8, the coil CL8-1 and the coil FIG. 64, which is a cross-sectional view of the AA' portion shown in FIGS. 62 and 63, and B shown in FIGS. 65, which is a cross-sectional view of the -B' portion, will be described.

First, as shown in FIG. 64 for the cross-sectional view of the AA' portion shown in FIGS. 62 and 63, in the left side portion of FIGS. , and are electrically connected to each other by vias V8. At the position of the via V8, the counterclockwise winding of the coil CL8-1 is cut back (folded back) to form the clockwise winding of the coil CL8-2. On the other hand, the power transmission open coil and the power transmission loop coil TL8 of the eighth embodiment composed of the coil CL8-1 and the coil CL8-2 are also laminated with the dielectric MM (see FIG. 59) interposed therebetween.

Next, as shown in FIG. 65 for the cross-sectional view of the BB' portion shown in FIGS. A dielectric MM is filled in the entire space between . That is, the dielectric MM is filled between the layers of the power transmission loop coil TL8 and the coils CL8-1 and CL8-2, and between the copper thin film wires of the power transmission loop coil TL8, between the copper thin film wires of the coil CL8-1 and A dielectric MM is also filled between each of the copper thin film wires of the coil CL8-2. As a result, the positional relationship between the power transmission loop coil TL8 and the power transmission open coil of the eighth embodiment, and the positional relationship between the coil CL8-1 and the coil CL8-2 in the power transmission open coil of the eighth embodiment are It is fixed, and as a result, the overall shape of the power transmission coil of the eighth embodiment is maintained. In addition to this, in the power transmission coil of the eighth embodiment, the center portion, that is, the innermost copper thin film wire of each of the power transmission loop coil TL8 and the power transmission open coil of the eighth embodiment and the power transmission of the eighth embodiment A space (a space of an air layer in which neither the dielectric MM nor the coil exists) is provided between the center of the coil as a whole, as shown in FIGS. 59, 62 and 63 .

Also, as shown in FIGS. 64 and 65, the copper thin film wire forming the coil CL8-2 is buried in the dielectric MM, but the side of the coil CL8-2 facing the receiving coil of the eighth embodiment (see FIG. 65) 64 and 65) is exposed to the outside. Although the copper thin film wire forming the power transmission loop coil TL8 is also buried in the dielectric MM, one surface thereof may be exposed to the outside as shown in FIGS. 64 and 65 .

(III) Method for manufacturing the power transmitting coil and the power receiving coil of the eighth embodiment
Next, a method for manufacturing the power transmitting coil and the power receiving coil of the eighth embodiment will be described.

As the manufacturing method, basically the same as the conventional method, the first manufacturing method including the following steps (a)-1 to (a)-13, or the following (b)-1 to (b)-14 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Form a copper thin film on both sides of the dielectric MM, such as a film-like glass epoxy resin (a)-2: On the copper thin film (both sides) formed in (a)-1 above are each coated with a resist.
(a)-3: The resist applied in (a)-2 above is patterned on the copper thin film wires of the coils CL8-1 and CL8-2 on each side.
(a)-4: After the patterning of (a)-3 above, an etching process is performed to form copper thin film wires as coils CL8-1 and CL8-2.
(a)-5: In order to fill the space between the copper thin film wires of (a)-4 with the dielectric MM, a glass epoxy resin or the like to be the dielectric MM is poured between the copper thin film wires and cured. At this time, the surface of the copper thin film wire of the coil CL8-2 facing the receiving coil of the eighth embodiment is exposed to the outside.
(a)-6: The via V8 is formed to form the power transmission open coil of the eighth embodiment.
(a)-7: A copper thin film is formed on the entire surface of the film-like glass epoxy resin or the like on which the power transmission loop coil TL8 is formed.
(a)-8: A resist is applied on the copper thin film formed in (a)-7 above.
(a)-9: The resist applied in (a)-8 above is patterned on the copper thin film wire of the transmission loop coil TL8.
(a)-10: After the patterning of (a)-9 above, an etching process is performed to form a copper thin film wire as the power transmission loop coil TL8.
(a)-11: In order to fill the space between the copper thin film lines of (a)-10 with the dielectric MM, a glass epoxy resin or the like to be the dielectric MM is poured between the copper thin film lines and cured.
(a)-12: The power transmission open coil of the eighth embodiment of (a)-6 above and the power transmission loop coil TL8 of the above (a)-11 are bonded together to form the power transmission coil of the eighth embodiment. .
(a)-13: Connection terminal O8-1 and connection terminal O8-2, the power transmission unit of the eighth embodiment (in the case of the power transmission device of the eighth embodiment) or the power reception unit of the eighth embodiment (eighth in the case of the power receiving device of the embodiment).
(b) Second manufacturing method
(b)-1: A copper thin film is formed on both sides of a dielectric MM such as a glass epoxy resin film.
(b)-2: A through hole is formed by a laser or the like at a position corresponding to the via V8.
(b)-3: Copper plating is applied to the entire structure including the through holes by electroless copper plating and electrolytic copper plating to form vias V8.
(b)-4: A resist is applied to each of the copper plating (both sides) formed in (b)-3 above.
(b)-5: The resist applied in (b)-4 above is patterned on the copper thin film wires of the coils CL8-1 and CL8-2.
(b)-6: Etching is performed after the patterning of (b)-5 above to form copper thin film wires as the coil CL8-1 and the coil CL8-2 to form the power transmission open coil of the eighth embodiment.
(b)-7: In order to fill the space between the copper thin film wires of (b)-6 with the dielectric MM, a glass epoxy resin or the like to be the dielectric MM is poured between the copper thin film wires and cured. At this time, the surface of the copper thin film wire of the coil CL8-2 facing the receiving coil of the eighth embodiment is exposed to the outside.
(b)-8: A copper thin film is formed on the entire surface of the film-like glass epoxy resin or the like on which the power transmission loop coil TL8 is formed.
(b)-9: A resist is applied on the copper thin film formed in (b)-8 above.
(b)-10: The resist applied in (b)-9 above is patterned on the copper thin film wire of the transmission loop coil TL8.
(b)-11: After the patterning of (b)-10, etching is performed to form a copper thin film wire as the power transmission loop coil TL8.
(b)-12: In order to fill the space between the copper thin film wires of (b)-11 with the dielectric MM, a glass epoxy resin or the like to be the dielectric MM is poured between the copper thin film wires and cured.
(b)-13: The power transmission open coil of the eighth embodiment of (b)-7 above and the power transmission loop coil TL8 of (b)-12 above are bonded together to form the power transmission coil of the eighth embodiment ( b)-14: Connection terminal O8-1 and connection terminal O8-2 and the power transmission unit of the eighth embodiment (in the case of the power transmission device of the eighth embodiment) or the power reception unit of the eighth embodiment (eighth embodiment for powered devices) and

(IV) Eighth embodiment
Next, regarding the effect of performing power transmission using the power transmission system of the eighth embodiment including the power transmission coil and the power reception coil of the eighth embodiment, based on experimental results (simulation results) by the inventors of the present application. 66 to 68. FIG.

(1) 8-1 Example
First, the above effects in the case where the material of the dielectric MM in the power transmitting coil of the eighth embodiment is changed and in the case where the dielectric MM is not filled will be described with reference to FIG. 66 . FIG. 66 is a graph showing the effect of the difference in the material of the dielectric in the coil of the eighth embodiment. and the relationship between the value of the S parameter (S21) related to transmission efficiency and the resonance frequency. In addition, the materials used in Example 8-1 are the above PET and the above glass epoxy resin. At this time, the dielectric constant of PET is about 2.9 to 3.2, and the dielectric constant of glass epoxy resin is about 4.5 to 5.2. Furthermore, "no dielectric" in FIG. 66 means that the dielectric MM in the power transmission coil TC of the eighth embodiment is air. Furthermore, the specifications of the power transmission coil of the eighth embodiment used in the experiment are as follows.
・Thickness of each copper thin film wire: 0.2 mm ・External dimensions in the plane of the power transmission coil of the eighth embodiment: about 100 mm in length × about 100 mm in width ・Number of turns of power transmission loop coil TL8: 2 turns (2 turns) (see Figures 59 and 62)
・The number of turns of the copper thin film wire of the coil CL8-1: three and a half turns (3.5 turns. See Figs. 60 and 62)
・The number of turns of the copper thin film wire of the coil CL8-2: Seven and a half turns (7.5 turns. See Figs. 61 and 63)
Then, as shown in FIG. 66, as the power transmitting coil (power receiving coil) of the eighth embodiment, both the transmission efficiency (parameter S21) and the reflectance (parameter S11) of the power transmission loop coil TL8 and It can be seen that the resonance frequency can be reduced by filling the dielectric MM between the layers of each of the power transmission open coils and between the copper thin film wires constituting the power transmission loop coil TL8 and the like. Furthermore, even when the dielectric MM is filled, it can be seen that the resonance frequency can be further reduced by using a material with a high dielectric constant.

(2) 8-2 Example
Next, the difference between the effect when using the power transmitting coil of the eighth embodiment and the effect when using a plurality of comparative power transmitting coils in which the structure of the dielectric MM is different from that of the power transmitting coil will be described with reference to FIGS. 67 and 68. FIG. FIG. 67 is a cross-sectional view showing the structure of the coils of the eighth embodiment and the comparative example, and FIG. 68 is a graph showing the difference in effect due to the difference in the structure of the coils of the eighth embodiment. At this time, FIGS. 67 and 68 respectively show the relationship between the value of the S parameter (S11) and the resonance frequency when the power transmission coil of the eighth embodiment and the power transmission coils of the respective comparative embodiments are used, and the above It shows the relationship between the value of the S parameter (S21) and the resonance frequency. Further, in Example 8-2 described below, the constituent members of each comparative form corresponding to the constituent members of the power transmission coil of the eighth embodiment are assigned the same member numbers as those of the power transmission coil of the eighth embodiment. , and the detailed description is omitted.

First, the structures of the power transmitting coils of the above-described comparative forms of Example 8-2 will be described with reference to FIG. First, as shown in the cross-sectional view of FIG. 67(b), in the power transmitting coil TC8-1 of the 8-1 comparative example, the eighth coil having the structure shown in the cross-sectional view of FIG. 67(a) similar to FIG. Unlike the power transmission coil TC8 of the embodiment, the dielectric MM1 is filled between the innermost copper thin film wire of the power transmission coil TC8-1 and the center of the entire power transmission coil TC8-1. That is, the power transmission coil TC8-1 of the 8-1 comparative example does not have the central space of the power transmission coil TC8 of the eighth embodiment. Next, the power transmission coil TC8-2 of the 8-2 comparative example has a dielectric MM2 of the power transmission coil TC8-2, as shown in FIG. Spaces are provided between the copper thin film wires forming the power transmission loop coil TL8 and between the copper thin film wires forming the coil CL8-2. Finally, in the power transmission coil TC8-3 of the 8-3rd comparative example, as shown in the cross-sectional view of FIG. is buried in the dielectric MM3. That is, the surface of the copper thin film wire of the coil CL8-2 of the 8-3 comparative example on the side facing the receiving coil of the eighth embodiment is not exposed. On the other hand, the specifications common to the power transmission coils of each comparative form are as follows, similarly to the power transmission coil TC8 of the eighth embodiment.
・Thickness of each copper thin film wire: 0.2 mm ・External dimensions in plane of each of the power transmission coils TC8-1 to TC8-3: about 100 mm long x about 100 mm wide ・Number of turns of the power transmission loop coil TL8: Double rotation (2 turns)
・The number of turns of the copper thin film wire of the coil CL8-1: three and a half turns (3.5 turns)
・The number of turns of the copper thin film wire of the coil CL8-2: Seven and a half turns (7.5 turns)
Then, as shown in FIG. 68, in both the transmission efficiency (parameter S21) and the reflectance (parameter S11), the power transmission coil TC8 of the eighth embodiment has the best performance (that is, the transmission efficiency is the highest, The reflectance is the lowest.), hereinafter, the power transmitting coil TC8-1 of the 8-1 comparative form → the power transmitting coil TC8-3 of the 8-3 comparative form → the power transmitting coil TC8-2 of the 8-2 comparative form It can be seen that the above performance is higher in order. As can be seen from FIG. 68, the resonance frequency does not change much in any of the power transmitting coil TC8 of the eighth embodiment and the power transmitting coils TC8-1 to TC8-3 of the comparative examples. From the above, firstly, it is understood that it is better to have a space in the central portion of the power transmission coil TC8 of the eighth embodiment. This is probably because, if the central portion is filled with a dielectric, the dielectric interferes with the electric field between the power transmitting loop coil TL8 and the power transmitting open coil of the eighth embodiment. Secondly, according to the results of comparison between the 8-2 comparative example, the 8th embodiment, and other comparative examples, it is preferable that the range on the cross-section of the dielectric to be filled is wide, but the coil CL8-2 It can be seen that the surface of the copper thin film wire in the eighth embodiment facing the power receiving coil should be exposed.

As described above, according to the power transmission using the power transmission system of the eighth embodiment including the power transmission coil and the power reception coil of the eighth embodiment, the power transmission loop coil formed by concentrically winding the copper thin film wires TL8 (the power receiving loop coil of the eighth embodiment) and the power transmitting open coil of the eighth embodiment (the power receiving open coil of the eighth embodiment) are concentrically laminated, and at least the interlayer between them is filled with the dielectric MM. Therefore, it is possible to reduce the resonance frequency of the power transmitting coil of the eighth embodiment (the power receiving coil of the eighth embodiment) as a whole. Therefore, when adjusting the resonance frequency, the length of each copper thin film wire can be shortened, and power loss and heat generation due to the electrical resistance of the copper thin film wire can be suppressed.

Further, in the power transmitting coil of the eighth embodiment (the power receiving coil of the eighth embodiment), the dielectric MM is also filled between adjacent copper thin film wires, so that the resonance frequency can be effectively reduced.

Furthermore, during non-contact power transmission, the opposing surface of the copper thin film wire constituting the coil CL8-2 is exposed (see FIGS. 64, 65 and 67 (a)), so that non-contact power transmission It can improve the transmission efficiency of time.

Furthermore, when the material of the dielectric MM is any one of PET, glass particle-dispersed epoxy resin, ceramic particle-dispersed epoxy resin, and fluororesin material, the resonance frequency can be effectively reduced.

In addition, the copper thin film wire of the innermost peripheral part of each of the power transmission loop coil TL8 (power receiving loop coil of the eighth embodiment) and the power transmission open coil of the eighth embodiment (power receiving open coil of the eighth embodiment) and the eighth embodiment and the center of the entire power transmission coil (receiving coil of the eighth embodiment). It is possible to achieve both weight reduction as a power receiving coil).

In the eighth embodiment described above, the open end T8-1 and the open end T8-2 of the outermost circumference of each of the coil CL8-1 and the coil CL8-2 are at the same position in the winding, and the innermost circumference In addition, the positions of the open end T8-1 and the open end T8-2 and the position of the innermost peripheral part or both are formed at different positions. may be

Further, in the eighth embodiment described above, the innermost circumferential portion of each of the power transmission loop coil TL8 (the power receiving loop coil of the eighth embodiment) and the power transmission open coil of the eighth embodiment (the power receiving open coil of the eighth embodiment) A space is provided between the copper thin film wire and the center of the entire power transmission coil (receiving coil of the eighth embodiment) of the eighth embodiment. It is sufficient that the relative permittivity between the center and the center is set to a relative permittivity corresponding to that of air. More specifically, the space between the innermost peripheral copper thin film wire and the center may be filled with a dielectric material (for example, polystyrene foam) having a dielectric constant equivalent to that of air. In this case, it is possible to achieve both an improvement in transmission efficiency during contactless power transmission and an improvement in strength as the power transmitting coil of the eighth embodiment (power receiving coil of the eighth embodiment).

Furthermore, even if the layers in which the coil CL8-1 and the coil CL8-2 that constitute the power transmitting open coil and the power receiving open coil in the eighth embodiment are exchanged (that is, the power transmitting loop coil TL8 or the eighth embodiment (Even if the positions (order) of the coils CL8-1 and CL8-2 viewed from the power receiving loop coil of the embodiment are exchanged), the same effects as those of the eighth embodiment can be obtained.

Furthermore, the coil CL8-1 and the coil CL8-2 of the eighth embodiment are connected by the via V8 at their innermost peripheral portions. may be insulated from each other.

Further, in the eighth embodiment described above, the power transmission loop coil TL8 (the power receiving loop coil of the eighth embodiment), the power transmission open coil of the eighth embodiment (eighth embodiment The case where the present invention is applied to the power transmission system of the eighth embodiment that includes the power transmission coil of the eighth embodiment and/or the power reception coil of the eighth embodiment that includes the power receiving open coil of the eighth embodiment, respectively. , In addition to this, two-layer coils that do not include a power transmission loop coil TL8 (power reception loop coil of the eighth embodiment) and constitute a power transmission open coil (power reception open coil) are connected at their innermost peripheral ends, Moreover, the present invention can also be applied to a power transmission system provided with power transmission coils and/or power reception coils in which the outermost periphery of each coil serves as a connection terminal. Even in this case, the same effects as those of the power transmission system of the eighth embodiment can be obtained.

Further, in the eighth embodiment described above, for the power transmission loop coil TL8 or the power reception loop coil of the eighth embodiment, or the end of the open end of the power transmission open coil or the power reception open coil of the eighth embodiment, , a capacitor is further connected in series or in parallel, and the resonance frequency of the power transmission loop coil TL8 or the power reception loop coil of the eighth embodiment, or the power transmission open coil of the eighth embodiment or the power reception open coil of the eighth embodiment. It may be configured to further lower the frequency.

(i) Ninth embodiment
Next, a ninth embodiment of the present invention will be described with reference to FIGS. 69 to 75. FIG.
(I) 9-1 embodiment
A ninth-1 embodiment according to the present invention will be described with reference to FIGS. 69 to 73. FIG.
(i) Regarding the overall configuration and operation of the power transmission system of the 9-1 embodiment
Since the overall configuration and operation of the power transmission system of the 9-1 embodiment are basically the same as the overall configuration and operation of the power transmission system S3 of the third embodiment, detailed description will be omitted.

(ii) Regarding the configuration of the power transmitting coil (power receiving coil) of the 9-1 embodiment
Next, configurations of the power transmitting coil and the power receiving coil of the 9-1 embodiment, which are used in the power transmission system of the 9-1 embodiment, will be described with reference to FIGS. 69 to 72. FIG. Note that the power transmitting coil and the power receiving coil of the 9-1 embodiment basically have the same configuration. That is, the configuration of the power transmitting loop coil of the 9-1 embodiment and the configuration of the power receiving loop coil of the 9-1 embodiment are basically the same. Also, the configuration of the power transmission open coil of the 9-1 embodiment and the configuration of the power reception open coil of the 9-1 embodiment are basically the same. Furthermore, the positional relationship in the power transmitting coil of the 9-1 embodiment between the power transmitting loop coil of the 9-1 embodiment and the power transmitting open coil of the 9-1 embodiment, and the power receiving loop coil of the 9-1 embodiment and the power receiving open coil of the 9-1 embodiment in the power receiving coil of the 9-1 embodiment are basically the same. Therefore, in the following description, the structure of the power transmission coil of the 9-1 embodiment will be described. This point is the same as in the 9-2 embodiment described below. 69 to 71 are plan views showing the structure of the power transmission coil of Embodiment 9-1, and FIG. 72 is a partial cross-sectional view showing the structure of the power transmission coil of Embodiment 9-1. At this time, FIGS. 69 to 71 are plan views of the power transmission coil of the 9-1 embodiment viewed from the power transmission unit side of the 9-1 embodiment in the power transmission device of the 9-1 embodiment.

As shown in a plan view in FIG. 69, the power transmission coils of the 9-1 embodiment include a power transmission loop coil TL9 and a power transmission loop coil TL9 of the ninth embodiment, a part of which is shown in FIG. 69 as a coil CL9-1. The open coil and are laminated in the paper surface direction of FIG. 69 via an insulating film BF9. In addition, the power transmission open coil of the 9-1 embodiment is configured by stacking the coil CL9-1 and the coil CL9-2 not shown in FIG. 69 in the paper surface direction of FIG. 69 via the film BF9. be. In addition, the winding centers of the copper thin film wires, which will be described later and which respectively constitute the power transmission loop coil TL9, the coil CL9-1, and the coil CL9-2, are the same or substantially the same.

Then, as shown in FIG. 69, the power transmission loop coil TL9 has a connection terminal O9-1 and a connection terminal O9-2 connected to the power transmission section of the 9-1 embodiment on one side of the outermost periphery. are doing. The power transmission loop coil TL9 is formed by winding a copper thin film wire for one turn, for example, and its both ends (in the case shown in FIG. 69, the center of the right side) are connected to the connection terminals O9-1. and the connection terminal O9-2. The copper thin film wire forming the power transmission loop coil TL9 has the same width and the same thickness over the entire circumference of the power transmission loop coil TL9. Furthermore, in the power transmission loop coil TL9, straight lines are provided on each of the upper side, lower side, left side, and right side in FIG. 69, and the respective straight lines are connected by curved lines.

On the other hand, the coil CL9-1 constituting the power transmission open coil of the 9-1 embodiment, which is formed in the same layer of the power transmission coil of the 9-1 embodiment as the power transmission loop coil TL9, is as shown in FIG. Furthermore, the outermost peripheral portion thereof is an open end T9-1. Then, the coil CL9-1 is counterclockwise starting from the open end T9-1, from the outermost peripheral portion to the innermost peripheral portion, for example, the copper thin film wire spirally turns two and a half turns (2.5 turns). It is configured by winding. A via V9 is connected to the innermost peripheral portion thereof for forming an electrical connection with the coil CL9-2 which is laminated directly under it in the paper surface direction of FIG. The copper thin film wire forming the coil CL9-1 has the same thickness over the entire circumference of the coil CL9-1. On the other hand, the width of the copper thin film wire is, as shown in FIG. spreads out over Furthermore, in the coil CL9-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. It is The width of the copper thin film wire that constitutes the coil CL9-1 is constant at each straight line portion, while at each curved line portion connecting them, the width is widened toward the innermost peripheral end. At this time, the width of the copper thin film wire that constitutes the coil CL9-1 should be widened from the outermost peripheral end to the innermost peripheral end of the coil CL9-1 as a whole. Even if it is temporarily (partially) narrowed toward the innermost peripheral edge, it does not affect the effect of power transmission using the power transmission system of the 9-1 embodiment.

Next, the configuration of the coil CL9-2 constituting the power transmission open coil of the 9-1 embodiment, which is laminated directly below the power transmission loop coil TL9 and the coil CL9-1 via the film BF9, is shown in FIG. will be used to explain. FIG. 70 is a plan view showing only the coil CL9-2.

As shown in FIG. 70, the coil CL9-2, which together with the coil CL9-1 constitutes the power transmission open coil of the 9-1 embodiment, has an electrical connection with the coil CL9-1 at its innermost peripheral portion. The via V9 for configuring is connected. That is, the connection between the coil CL9-1 and the coil CL9-2 is a series connection across the layers of the power transmission coils of the 9-1 embodiment. Then, the coil CL9-2 starts from the via V9 in the clockwise direction (that is, in the direction opposite to the coil CL9-1), and extends from the innermost peripheral portion to the outermost peripheral portion, for example, a copper thin film wire spirally. It is configured by being wound ten and a half turns (10.5 turns). Further, the outermost peripheral portion thereof is an open end T9-2. The copper thin film wire forming the coil CL9-2 has the same width and thickness over the entire circumference of the coil CL9-2. Furthermore, in the coil CL9-2, as in the coil CL9-1, straight lines parallel to each other are provided on the upper side, the lower side, the left side, and the right side in FIG. Each is connected by an arcuate curve.

Here, the relationship between the copper thin-film wires constituting the power transmission loop coil TL9, the coil CL9-1, and the coil CL9-2 is such that they are wound in the counterclockwise direction in the same layer as the power transmission loop coil TL9. The number of turns of the copper thin film wire of the coil CL9-1 (two and a half turns (2.5 turns)) of the coil CL9-1 that is wound in the clockwise direction and the number of turns of the copper thin film wire of the coil CL9-2 that is wound clockwise (ten and a half turns) (10.5 turns)) and each copper thin film wire is wound differently. In addition, the width obtained by adding the width of the copper thin film wire forming the power transmission loop coil TL9 and the width of the entire winding side of the coil CL9-1 (indicated by the symbol “W1” in FIG. 69), and the width of the coil CL9-2 The width of the copper thin film wire of the coil CL9-2 is substantially the same as the width of the entire corresponding side of the winding (indicated by symbol “W2” in FIG. 70). is narrower overall than the width of The coil CL9-1 and the coil CL9-2 are connected in series by the via V9 connected to the innermost circumference of each. As a result, the winding from the outermost peripheral portion to the innermost peripheral portion of the coil CL9-1 is cut back (folded back) in the opposite direction at the innermost peripheral portion, so that the coil CL9-2 is turned from the innermost peripheral portion to the outermost peripheral portion. is wound to

Next, referring to FIG. 71, the positional relationship between the copper thin-film wires respectively constituting the power transmission loop coil TL9 and the power transmission open coil (that is, the coil CL9-1 and the coil CL9-2) of the 9-1 embodiment. to explain. FIG. 71 is a plan view showing how the power transmission loop coil TL9 and the coil CL9-1 are overlapped with the coil CL9-2. (illustration is omitted in FIG. 71) are indicated by dashed lines.

As shown by the solid line in FIG. 71, in the coil CL9-1 wound from the outer circumference to the inner circumference and connected to the coil CL9-2 by the via V9 at the innermost circumference, , and the thin film copper wire is wound such that each curved portion is formed such that the position of the linear portion is shifted toward the inner peripheral side by a quarter of the pitch of the winding of the thin copper film wire.

On the other hand, as shown by the solid line in FIG. 71, the power transmission loop coil TL9 is laminated along the outer edge of the coil CL9-2, and the connection terminal O9-1 and the connection terminal O9-2 protrude outside the winding. It is considered to be a shape that Further, as shown by the dashed line in FIG. 71, even the coil CL9-2 wound from the inner circumference to the outer circumference and connected in series with the coil CL9-1 by the via V9 at the innermost circumference is a quarter of that. Each round, the thin copper wire is wound with curved portions so that the position of the straight portion is shifted to the outer peripheral side by a quarter of the winding pitch of the thin copper wire. As shown in FIG. 71, the power transmission loop coil TL9 having the coil CL9-1 wound on its inner peripheral side is laminated along the outer edge of the coil CL9-2.

As shown in FIG. 71 above, in the power transmitting coil of the 9-1 embodiment in which the power transmitting loop coil TL9, the coil CL9-1, and the coil CL9-2 are stacked, the power transmitting loop coil The copper thin film wires forming the TL9 and the power transmission open coils (the coil CL9-1 and the coil CL9-2) of the 9-1 embodiment are laminated so as to substantially overlap each other.

Next, regarding the lamination state of the power transmission loop coil TL9, the coil CL9-1, and the coil CL9-2, and the connection state of the coil CL9-1 and the coil CL9-2, the cross section of the AA' portion shown in FIG. This will be explained using FIG. 72 as a diagram.

As shown in FIG. 72, on the left side of FIGS. 69 to 71, a coil CL9-1 and a coil CL9-2 are laminated with a film BF9 interposed therebetween, and are electrically connected to each other by a via V9. . At the position of the via V9, the counterclockwise winding of the coil CL9-1 is cut back (folded back) to form the clockwise winding of the coil CL9-2. On the other hand, although not shown in FIG. 72, the power transmission loop coil TL9 is laminated in the same layer as the coil CL9-1, and the coil CL9-1 and the power transmission loop coil TL9 are insulated.

(iii) About the method for manufacturing the power transmitting coil and the power receiving coil of the 9-1 embodiment
Next, a method for manufacturing the power transmitting coil and the power receiving coil of the 9-1 embodiment will be described.

The manufacturing method is basically the same as the conventional first manufacturing method including the following steps (a)-1 to (a)-6, or the following (b)-1 to (b)-7 It is possible to use a second manufacturing method or the like including each step of .
(a) First manufacturing method
(a)-1: Copper thin films are formed on both sides of the film BF9.
(a)-2: A resist is applied to each of the copper thin films (both sides) formed in (a)-1 above.
(a)-3: The resist applied in (a)-2 above is applied to each surface of the copper thin film wires of the power transmission loop coil TL9 and the coil CL9-1 (one surface), and the copper thin film of the coil CL9-2. Pattern in lines (other side).
(a)-4: After the patterning in (a)-3 above, an etching process is performed to form copper thin-film wires as the power transmission loop coil TL9, the coil CL9-1, and the coil CL9-2.
(a)-5: The via V9 is formed to connect the coil CL9-1 and the coil CL9-2 to form the power transmission open coil of the 9-1 embodiment, and the power transmission coil of the 9-1 embodiment as a whole is formed. Form.
(a)-6: The connection terminal O9-1 and the connection terminal O9-2, and the power transmission unit of the 9-1 embodiment (in the case of the power transmission device of the 9-1 embodiment) or the 9-1 embodiment (in the case of the power receiving device of the 9-1 embodiment).
(b) Second manufacturing method
(b)-1: A thin copper film is formed on both sides of the film BF9.
(b)-2: A through hole is formed by a laser or the like at a position corresponding to the via V9.
(b)-3: Copper plating is applied to the entire structure including the through holes by electroless copper plating and electrolytic copper plating to form vias V9.
(b)-4: A resist is applied to each of the copper plating (both sides) formed in (b)-3 above.
(b)-5: The resist applied in (b)-4 above is applied to each surface of the copper thin film wires of the power transmission loop coil TL9 and the coil CL9-1 (one surface), and the copper thin film of the coil CL9-2. Pattern in lines (other side).
(b)-6: Etching is performed after the patterning of (b)-5 above to form a copper thin film wire as the power transmission loop coil TL9 and a copper thin film wire as the coil CL9-1 and the coil CL9-2. to form the power transmission open coil of the ninth embodiment, and form the power transmission coil of the ninth embodiment as a whole.
(b)-7: Connection terminal O9-1 and connection terminal O9-2 and the power transmission unit of the 9-1 embodiment (in the case of the power transmission device of the 9-1 embodiment) or the power transmission device of the 9-1 embodiment Connect the power receiving unit (in the case of the power receiving device of the 9-1st embodiment)

(iv) 9-1 Example
Next, experimental results (simulation Results) will be described with reference to FIGS. 73 and 74. FIG. FIG. 73 is a graph showing the relationship between reflection/transmission efficiency and frequency as an effect of the coil structure of the 9-1 embodiment, and FIG. 74 is an effect of the coil structure of the 9-1 embodiment. is a graph showing the relationship between the leakage magnetic field and the distance. Further, in the following description, the copper thin film wires constituting the power transmitting loop coil TL9 and the power receiving loop coil of the 9-1 embodiment are simply referred to as "loop coil thin copper film wires", and the power transmitting loop coil of the 9-1 embodiment A copper thin film wire that constitutes each of the open coil and the power receiving open coil is simply referred to as an "open coil copper thin film wire". Further, FIG. 73 shows the relationship between the resonance frequency as the effect and the value of the S parameter (S11) related to the reflectance, and the value of the S parameter (S21) related to the resonance frequency and the transmission efficiency as the effect. is a diagram showing the relationship of Furthermore, FIG. 74 shows the leakage magnetic field when power of 1 kilowatt is input to the power transmitting coil or power receiving coil of the 9-1 embodiment. At this time, the horizontal axis of FIG. 74 indicates the distance based on the center of the power transmitting coil or the power receiving coil of the 9-1 embodiment, and the vertical axis indicates the leakage magnetic field when 1 microampere/meter is 0 decibel. is shown. Furthermore, the respective specifications of the loop coil thin film copper wire and the open coil thin copper film wire of the 9-1 embodiment for which the experimental results shown in FIGS. 73 and 74 were obtained are as follows.
・The distance between the power transmitting coil and the power receiving coil of the 9-1 embodiment: 50 mm External dimensions on the plane shown in FIGS. 69 to 71: about 100 mm long x about 100 mm wide ・Thicknesses of open coil copper thin film wire and loop coil copper thin film wire: all constant 0.2 mm ・Coil CL9-1 Number of turns of copper thin film wire: 2 and a half turns (2.5 turns. See FIGS. 69 and 71)
・The number of turns of the copper thin film wire of the coil CL9-2: ten and a half turns (10.5 turns. See FIGS. 70 and 71)
- Spacing between adjacent copper thin-film wires: 0.2 mm for both power transmission loop coil TL9 and coil CL9-1 and coil CL9-2. Part of the power transmission open coil and the power reception open coil uses a power transmission coil and a power reception coil that are not formed in the same layer as the power transmission loop coil and the power reception loop coil. That is, in the conventional power transmitting coil and the power receiving coil, the power transmitting coil and the power receiving coil are formed by a layer in which only the power transmitting loop coil and the power receiving loop coil are formed and a layer in which the power transmitting open coil and the power receiving open coil made of one coil are formed. A receiving coil is formed. On the other hand, other specifications of the power transmitting coil and the power receiving coil of the conventional example are the same as those of the power transmitting coil and the power receiving coil of the 9-1 embodiment.

Then, as shown in FIG. 73, when the power transmitting coil and the power receiving coil of the 9-1 embodiment are used, the transmission efficiency (S parameter ( It can be seen that the resonance frequencies of both S21)) and reflectance (S parameter (S11)) are reduced. That is, when the power transmitting coil and the power receiving coil of the conventional example are used, the resonance frequency is about 23 MHz, whereas when the power transmitting coil and the power receiving coil of the 9-1 embodiment are used, the resonance frequency is 14.8 MHz and 16 MHz. It's down to megahertz. This effect is obtained by lowering the mutual resonance frequency between the coil CL9-1 and the coil CL9-2 that constitute the power transmitting open coil and the power receiving open coil of the 9-1 embodiment, and the power transmitting coil of the 9-1 embodiment. and the resonance frequency of the power receiving coil as a whole is considered to be reduced. In addition, due to this effect, when adjusting the resonance frequency of the power transmitting coil or the power receiving coil of the 9-1 embodiment, the length of the copper thin film wire itself of each of the coil CL9-1 and the coil CL9-2 can be shortened. It is possible to suppress power loss and heat generation due to the electrical resistance of the copper thin film wire.

On the other hand, when comparing the power transmitting coil and the power receiving coil of the 9-1 embodiment and the power transmitting coil and the power receiving coil of the conventional example from the viewpoint of leakage electromagnetic field, as shown in FIG. 74, indicated by white arrows in FIG. When viewed from the center position of the coil, the leakage electromagnetic field (leakage magnetic flux) by the power transmitting coil and the power receiving coil of the 9-1 embodiment is suppressed lower than the leakage electromagnetic field by the power transmitting coil and the power receiving coil of the conventional example. there is This is because, in the power transmitting coil and the power receiving coil of the 9-1 embodiment, the copper thin-film wires of the coil CL9-1 and the coil CL9-2, which are superimposed at substantially the same position with the film BF9 interposed therebetween, are oriented in opposite directions. Since the current flows, the direction of the leakage electromagnetic field (leakage magnetic flux) generated by them becomes the center direction of each of the coils CL9-1 and CL9-2, and as a result, the leakage electromagnetic field to the outside is suppressed. It is thought that This fact has also been confirmed by the inventor of the present invention through a three-dimensional simulation of leakage magnetic flux.

As described above, according to power transmission using the power transmission system of the 9-1 embodiment including the power transmission coil and the power reception coil of the 9-1 embodiment, a plurality of coils CL9-1 and coils CL9-2 One coil CL9-1 in the power transmitting open coil (or power receiving open coil) of the 9-1 embodiment, which is concentrically laminated, is the power transmitting open coil (or power receiving open coil) of the 9-1 embodiment ) concentrically with the power transmitting loop coil TL9 (or the power receiving loop coil of the 9-1 embodiment), so that the power transmitting coil of the 9-1 embodiment (or the 9th -Improvement of transmission efficiency as the power receiving coil of the 1st embodiment) and reduction in size and manufacturing by reducing the number of layers of the power transmitting coil of the 9-1 embodiment (or the power receiving coil of the 9-1 embodiment) as a whole (Material) cost can be reduced at the same time.

In addition, the innermost peripheral ends of the coil CL9-1 and the coil CL9-2 are connected to each other by a via V9, and the outermost peripheral ends of the coil CL9-1 and the coil CL9-2 are the open ends T9-1. and the open end T9-2, the transmission efficiency of the power transmitting coil of the 9-1 embodiment (or the power receiving coil of the 9-1 embodiment) can be further improved. In addition, as the coil CL9-1 and the coil CL9-2 of the 9-1 embodiment, each innermost peripheral portion (not the innermost peripheral end, but the innermost peripheral portion close to the innermost peripheral end) may be connected by a via V9, or the outermost periphery of each of the coil CL9-1 and the coil CL9-2 (not the outermost periphery, but the outermost periphery near the outermost periphery) may be open.

Furthermore, each of the copper thin film wires constituting the coil CL9-1 and the coil CL9-2 and the copper thin film wire constituting the power transmitting loop coil TL9 (or the power receiving loop coil of the 9-1 embodiment) is the 9-1 implementation Since it is a flat copper thin film wire in the radial direction of the power transmission coil (or the power reception coil of the 9-1 embodiment), it is possible to effectively adjust the resonance frequency between the coils.

(II) 9-2nd embodiment
Next, a ninth-2 embodiment, which is another embodiment of the present invention, will be described with reference to FIG. It should be noted that FIG. 75 is a plan view showing the structure of the coil of the 9-2 embodiment. At this time, FIG. 75 is a plan view when the power transmission coil of the 9-2 embodiment is seen from the power transmission unit side of the 9-2 embodiment in the power transmission device of the 9-2 embodiment. Further, in the 9-2 embodiment described below, the same member numbers are attached to the same constituent members as in the power transmission system of the 9-1 embodiment, and the detailed explanation is omitted.

The power transmission system of the 9-2 embodiment described below is the power transmission coil of the 9-2 embodiment and the power reception coil of the 9-2 embodiment in contrast to the power transmission system of the 9-1 embodiment described above. Only the configurations of the power transmission loop coil and the power reception loop coil of the 9-2 embodiment, which respectively configure the coils, are different, and the other configurations and the manufacturing method thereof are the same as those of the power transmission system of the 9-1 embodiment. Therefore, in the following description, only the portions with different configurations will be described, and descriptions of other similar configurations and manufacturing methods will be omitted. Also, similarly to the power transmission system of the 9-1 embodiment, the configuration of the power transmission loop coil of the 9-2 embodiment and the configuration of the power reception loop coil of the 9-2 embodiment are basically the same. Therefore, in the following description, the configuration of the power transmission loop coil of the 9-2 embodiment will be described using FIG. Note that in FIG. 75, the power transmission loop coil of the power transmission coil of the 9-2 embodiment and the coil CL9-1 formed in the same layer in the power transmission coil are indicated by dashed lines.

As shown in the plan view of FIG. 75, in the layer of the power transmission coil of the 9-2 embodiment in which the power transmission loop coil TL9-1 of the 9-2 embodiment is formed, the power transmission coil of the 9-1 embodiment is formed. A coil CL9-1 (see the dashed line in FIG. 75) that constitutes the power transmission open coil of the 9-2 embodiment is formed in the same manner as the power transmission coil of FIG. The power transmission loop coil TL9-1 has a connection terminal O9-1 connected to the power transmission section of the 9-2 embodiment and a connection has a terminal O9-2 for In addition, the power transmission loop coil TL9-1 is configured by, for example, winding a copper thin film wire three turns (three turns) within the same layer of the power transmission coil of the 9-2 embodiment as the coil CL9-1. Both ends are used as the connection terminal O9-1 and the connection terminal O9-2. Further, the copper thin-film wire constituting the power transmission loop coil TL9-1 has the same width and thickness over the entire circumference of the power transmission loop coil TL9-1. Furthermore, in the power transmission loop coil TL9-1, straight portions are provided on each of the upper, lower, left and right sides in FIG. 75, and the respective straight portions are connected by curved portions. Further, the winding centers of the copper thin film wires forming the power transmission loop coil TL9-1 and the coils CL9-1 and CL9-2 are made to be the same or substantially the same.

At this time, the mutual insulation at the position where the power transmission loop coil TL9-1 and the coil CL9-1 intersect, and the mutual insulation at the position where the copper thin film wire itself constituting the power transmission loop coil TL9-1 intersects are as follows. It is maintained by forming one over the other, for example using jumper wires.

On the other hand, the relationship between the copper thin film wires forming the power transmission loop coil TL9-1, the coil CL9-1, and the coil CL9-2, respectively, is that the width of the copper thin film wire forming the power transmission loop coil TL9-1 and the coil The width obtained by adding the width of the entire side of the winding of the coil CL9-1 and the corresponding width of the entire side of the winding of the coil CL9-2 are substantially the same as in the case of the 9-1 embodiment. It is formed to be

As described above, according to power transmission using the power system of the 9-2 embodiment including the power transmitting coil and the power receiving coil of the 9-2 embodiment, the power transmission system of the 9-1 embodiment can be used. In addition to the effect of power transmission, the copper thin film wire that constitutes the power transmission loop coil TL9-1 (or the power reception loop coil of the second embodiment) is wound multiple times (three turns (three turns) in the case shown in FIG. 75). Since it is rotated, it is possible to further improve the transmission efficiency of the power transmitting coil of the 9-2 embodiment (or the power receiving coil of the 9-2 embodiment).

In each of the ninth embodiments described above, the coil CL9-1 and the coil CL9-2 are configured so that the innermost peripheral portions of the coils CL9-1 and CL9-2 are at the same winding position. may be formed at different positions.

In addition, the coil CL9-1 and the coil CL9-2 in the above-described 9-2 embodiment were connected by the via V9 at their innermost peripheral portions, but in addition to this, the coil CL9-1 and the coil CL9 -2 may be insulated from each other.

Further, the position of the power transmitting loop coil and the position of the power transmitting open coil in the power transmitting coil of each of the ninth embodiments described above are exchanged, and the position of the power receiving loop coil and the position of the power receiving open coil in the power receiving coil of each of the ninth embodiments are exchanged. can be interchanged with In this case, in the power transmission system as a whole, the power transmission loop coils of the power transmission coils and the power reception loop coils of the power reception coils of each ninth embodiment are arranged to face each other inside the power transmission system.

Furthermore, in each of the ninth embodiments described above, in series or parallel with the end of the open end of the power transmitting open coil or power receiving open coil, or in parallel with the power transmitting loop coil or power receiving loop coil, A capacitor may be further connected to further lower the resonance frequency as a power transmission loop coil or a power reception loop coil, or a power transmission open coil or a power reception open coil.

As is clear from each drawing, the coils of each embodiment and each modification are preferably made of copper thin film wires formed in the same layer.

S, S1, S3, S7 Power transmission system T, T7 Power transmission device R, R7 Power reception device G Gap TR Power transmission unit RV Power reception unit TC, TC1, TC7, TC8, TC8-1, TC8-2, TC8-3 Power transmission coil TL , TL1, TL4, TL5, TL6, TL7, TL8, TL9 Transmitting loop coil TO, TCL7 Transmitting open coil RC, RC1, RC7 Receiving coil RL, RL7 Receiving loop coil RO, RCL7 Receiving open coil CL1-1, CL1-2, CL2-1, CL2-2, CL1-3, CL1-4, CL3-1, CL3-2, CL4-1, CL4-2, CL5-1, CL5-2, CL5-11, CL5-21, CL5- 31, CL5-32, CL6-1, CL6-2, CL8-1, CL8-2, CL9-1, CL9-2 Coil BF1, BF2, BF3-1, BF3-2, BF4-1, BF4-2, BF5-1, BF5-2, BF6-1, BF6-2, BF7, BF9 Film O1-1, O1-2, O2-1, O2-2, O3-1, O3-2, O4-1, O4- 2, O5-1, O5-2, O6-1, O6-2, O7-1, O7-2, O8-1, O8-2, O9-1, O9-2 Connection terminal V1-1-3, V1-3-2, V1-2-4, V2, V3, V4, V5, V6, V8, V9 Via T3-1, T3-2, T4-1, T4-2, T5-1, T5-2, T5-11, T5-12, T5-13, T5-21, T5-22, T5-23, T6-1, T6-2, T7-1, T7-2, T8-1, T8-2, T9- 1, T9-2 open end MM, MM1, MM2, MM3 dielectric

Claims (10)

In a coil pair for contactless power transmission,
a first coil for power transmission or power reception;
a second coil, which is laminated on the first coil, to which the power to be transmitted is supplied during power transmission and to which the received power is output during power reception;
with
The first coil is
an outer and inner winding line wound from the outer peripheral side toward the inner peripheral side of the first coil;
an inner/outer winding line wound in the same winding direction as the outer/inner winding line from the inner circumference side toward the outer circumference side of the first coil;
with
The outer and inner winding lines are wound on one plane,
The inner and outer winding lines are wound on a plane different from the plane on which the outer and inner winding lines are wound,
In the first coil, the outer/inner winding lines and the inner/outer winding lines are overlapped with an insulating portion interposed therebetween such that the windings of the outer/inner winding lines and the windings of the inner/outer winding lines are overlapped. cage,
The outermost peripheral end portions of the outer and inner winding lines and the outermost peripheral end portions of the inner and outer winding lines are open,
The cross-sectional area of the winding line that constitutes the second coil is larger than the cross-sectional area of the winding line that constitutes the first coil,
The cross-sectional area of the facing winding line, which is the winding line forming the first coil laminated at the position facing the second coil, is larger than the cross-sectional area of the winding line of the first coil other than the facing winding line. A coil pair characterized by being large . In a coil pair for contactless power transmission,
a first coil for power transmission or power reception;
A second coil that supplies the power to be transmitted to the first coil during power transmission and that receives power from the first coil during power reception, wherein the power is supplied from the first coil to the first coil. a second coil to be laminated;
with
The first coil includes outer and inner winding lines wound from the outer circumference side to the inner circumference side of the first coil, and outer and inner winding lines wound from the inner circumference side to the outer circumference side of the first coil. Inner and outer winding lines wound in opposite directions are laminated with an insulating part in between,
the innermost peripheral end portions of the outer and inner winding lines and the innermost peripheral end portions of the inner and outer winding lines are connected,
The outermost peripheral end portions of the outer and inner winding lines and the outermost peripheral end portions of the inner and outer winding lines are open,
The cross-sectional area of the winding line that constitutes the second coil is larger than the cross-sectional area of the winding line that constitutes the first coil,
The cross-sectional area of the facing winding line, which is the winding line forming the first coil laminated at the position facing the second coil, is larger than the cross-sectional area of the winding line of the first coil other than the facing winding line. A coil pair characterized by being large . In the coil pair according to claim 1 or claim 2,
A coil pair , wherein the self-resonant frequencies of the outer and inner windings and the self-resonant frequencies of the inner and outer windings are different from each other . In the coil pair according to any one of claims 1 to 3,
The position of the second coil winding line, which is the winding line forming the second coil, in the radial direction of the coil pair is the distance between the outermost edge portion and the innermost edge portion of the windings of the outer/inner winding line and the inner/outer winding line. between
The width of the second coil winding line is wider than the radial interval between the center lines of the outer/inner winding line and the inner/outer winding line in the windings of the outer/inner winding line and the inner/outer winding line. A coil pair characterized by: In the coil pair according to any one of claims 1 to 4,
A coil pair, wherein the insulating portion is a dielectric . In the coil pair according to any one of claims 1 to 5 ,
A third coil connected to the first coil is formed in the same layer as the second coil in the coil pair,
A coil pair, wherein each of the outer and inner winding lines, the inner and outer winding lines, and the third coil is formed by winding a thin film wire that is flat in the radial direction of the coil pair. The power transmitting device included in a power transmission system configured by a power transmitting device and a power receiving device separated from the power transmitting device and transmitting power from the power transmitting device to the power receiving device in a contactless manner,
A power transmission coil pair that is the coil pair according to any one of claims 1 to 5, the power transmission coil pair being arranged to face the power receiving device;
output means for outputting power to be transmitted to the second coil of the power transmission coil pair;
A power transmission device comprising : In the power receiving device included in a power transmission system configured by a power transmitting device and a power receiving device separated from the power transmitting device and configured to wirelessly transmit power from the power transmitting device to the power receiving device,
a power receiving coil pair that is the coil pair according to any one of claims 1 to 5, the power receiving coil pair being arranged to face the power transmission device;
input means connected to the second coil of the receiving coil pair;
A power receiving device comprising : The power transmission device according to claim 7 ;
a power receiving device that is spaced apart from the power transmitting device and arranged to face the pair of power transmitting coils, the power receiving device receiving power transmitted from the power transmitting device;
A contactless power transmission system comprising : a power transmission device;
9. The power receiving device according to claim 8, wherein the power receiving device is separated from the power transmitting device and the power receiving coil pair is arranged to face the power transmitting device, and receives power transmitted from the power transmitting device;
A contactless power transmission system comprising :

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