JP6115078B2 - Coil parts - Google Patents

Description

  The present invention relates to a coil component and a manufacturing method thereof, and more particularly, to a surface mount type coil component configured using a drum core and a manufacturing method thereof.

  2. Description of the Related Art A surface mount type coil component configured using a drum core is known. The drum core is a magnetic body having a winding core portion and a pair of flange portions formed at both ends thereof, which are integrally formed. One or a plurality of wires constituting the coil are wound around a winding core portion and are respectively connected to terminal electrodes formed on one surface of the pair of flange portions.

  Patent Document 1 discloses an inductor that is not a surface mount type coil component, but is configured using a core having a winding core portion and a flange portion (flange portion) similar to a drum core.

JP 2009-30321 A

  By the way, some coil parts have a standard value range of inductance determined. Coil parts whose inductance is found not to be included in this range in the test before shipment are discarded as defective products. Needless to say, it is better to reduce the number of coil components discarded as defective products, and it is required to increase the ratio (yield) of coil components having an inductance that falls within the standard value range.

  As one of the constitutions for realizing the yield improvement, as shown in FIG. 1 of Patent Document 1, a metal film is formed on the end surface of the collar portion (the surface located on the opposite side of the surface to which the core portion is connected). Can be considered. The metal film formed on the end face of the collar portion generates eddy currents when magnetic flux generated in the coil component passes. Since this eddy current flows in a direction that cancels the change in magnetic flux generated in the coil component, the presence of the metal film suppresses the inductance of the coil component.

  In order to improve the yield, such a coil component is designed so that the inductance in a state where the metal film is formed is included in the range of the standard value. Then, after the coil parts are completed (the state in which the metal film remains intact), the inductance is measured, and if the measured inductance falls below the standard value range, Remove some or all. As a result, the effect of suppressing the inductance by the metal film can be relaxed or cancelled, and the inductance can be increased. Therefore, it is possible to increase the ratio of coil components having an inductance that falls within the standard value range.

  However, the above-described method for adjusting the inductance by removing the metal film has a problem that the work time required for removing the metal film may become very long. That is, since the metal film of Patent Document 1 covers all of the region surrounded by the outer shape (filled), the degree of increase in inductance is in accordance with the shaved area. Therefore, the larger the difference between the inductance before removing the metal film and the range of the standard value, the larger the area of the metal film to be removed. In some cases, the work time required for removing the metal film becomes very long. End up.

  Accordingly, one of the objects of the present invention is to provide a coil component that can reduce the work time required for subsequent changes in inductance, as compared with the case of using a metal film that covers all of the region surrounded by the outer shape. It is to provide a manufacturing method.

  In order to achieve the above object, a coil component according to the present invention includes a drum core having a core part and a pair of flanges provided at both ends of the core part, and one or more wound around the core part. A wire and a conductive member constituting at least one conductor loop are provided on at least one surface of the pair of flanges.

  The conductor loop has the effect of suppressing the inductance, like a metal film that covers all of the area surrounded by the outer shape, but most of it is due to the loop current that circulates around the conductor loop instead of the eddy current. It will be a thing. When a part of the conductor loop is cut, the loop current stops flowing, so that most of the inductance suppressing effect is lost. That is, according to the present invention, the inductance of the coil component can be greatly increased by simply cutting a part of the conductor loop, so that compared with the case where a metal film that covers all of the region surrounded by the outer shape is used. The work time required for the subsequent change of the inductance of the coil component can be shortened.

  In the coil component, one of the pair of flanges is a substantially rectangular parallelepiped magnetic body having first to sixth surfaces, and the other of the pair of flanges has seventh to twelfth surfaces. The first surface and the sixth surface, the second surface and the fifth surface, and the third surface and the fourth surface on opposite sides, respectively. The seventh surface and the twelfth surface, the eighth surface and the eleventh surface, the ninth surface and the tenth surface are located on opposite sides of each other, and the core The portion is connected to one of the pair of flanges on the first surface, and is connected to the other of the pair of flanges on the seventh surface, , At least one first terminal to which one end of each of the one or more wires is connected A pole is formed, and at least one second terminal electrode connected to the other end of each of the one or plurality of wires is formed on the eighth surface, and the conductive member includes the third, It may be formed on at least one of the fifth, sixth, and eleventh surfaces. According to this, a suitable conductor loop can be constituted.

  In the coil component, the conductive member may constitute one conductor loop by a portion formed on the sixth surface. According to this, since the loop internal area of the conductor loop can be freely adjusted, it is possible to adjust the rate of change of inductance before and after the conductor loop is cut to a desired value.

  In the coil component, there is one wire wound around the core portion, each of the first and second terminal electrodes is one, and the first terminal electrode is the conductive material. A part of the member is formed, and the conductive member is formed by a portion formed on the fifth surface, a portion formed on the sixth surface, and a portion serving as the first terminal electrode. Two conductor loops may be formed. According to this, since a relatively large conductor loop can be formed, it is possible to increase the rate of change of inductance before and after the conductor loop is cut. Further, the terminal electrode can be effectively used as a part of the conductor loop.

  In the coil component, the conductive member may form one conductor loop by a portion formed on the fifth surface and a portion formed on the sixth surface. According to this, since a relatively large conductor loop can be formed, it is possible to increase the rate of change of inductance before and after the conductor loop is cut.

  In the coil component, the conductive member may form one conductor loop by a portion formed on the fifth surface, and the conductive member is formed on the third surface. One conductor loop may be constituted by the formed portions. According to this, it is possible to obtain an inductance change rate different from the case where the conductive member is formed on the sixth surface.

  In the coil component, the conductive member may form two conductor loops by a portion formed on the sixth surface, and the conductive member may be formed on the fifth surface. One conductor loop may be constituted by the formed portion, and another conductor loop may be constituted by the portion formed on the eleventh surface, or the wire wound around the core portion Is one, each of the first and second terminal electrodes is one, the first terminal electrode constitutes a part of the conductive member, and the conductive member is the fifth A portion formed on the surface of the first portion and a portion formed on the sixth surface constitute one conductor loop, and the portion formed on the sixth surface and the first terminal electrode Part one and the other one It is also possible to configure the conductive loop. According to these, the inductance can be adjusted in a plurality of stages.

  A coil component manufacturing method according to the present invention includes a drum core having a core part and a pair of flanges provided at both ends of the core part, one or a plurality of wires wound around the core part, and Generating a coil component including a conductive member forming at least one conductor loop on at least one surface of the pair of flanges, a measuring step of measuring an inductance of the coil component, and the measurement A first determination step for determining whether or not the inductance obtained by the measurement in the step is within a predetermined range; and a determination result of the first determination step is negative. And a cutting step of cutting the conductor loop by removing a part thereof.

  According to the present invention, even if the inductance is not initially within the range of the standard value, the inductance can be within the range of the standard value through the cutting step. Therefore, the yield of the process for manufacturing the coil component is improved.

  In the coil component manufacturing method, whether or not the inductance of the coil component can be adjusted by cutting at least a part of the at least one conductor loop when the determination result of the first determination step is negative. The cutting step may be executed when the determination result of the second determination step is affirmative. Further, in this manufacturing method, in the second determination step, it is determined whether or not a conductor loop that can be cut remains, and one or more conductor loops that are determined to be cut are cut. It is also possible to determine whether or not the inductance of the coil component that has been changed by the above is within the predetermined range, and to determine that the adjustment is possible when the results of these two determinations are both affirmative.

  Moreover, in the manufacturing method of each coil component described above, after the cutting by the cutting step, the steps after the measuring step may be repeated. According to this, when the conductive member forms a plurality of conductor loops, it becomes possible to increase the inductance step by step.

  According to the present invention, it is possible to reduce the work time required for the subsequent change of the inductance of the coil component, compared to the case where a metal film that covers all of the region surrounded by the outer shape is used.

(A) and (b) are schematic perspective views showing the external structure of the surface mount inductor according to the embodiment of the present invention. It is explanatory drawing for demonstrating the effect of having provided the electroconductive member which comprises a conductor loop in the surface of a collar part. 5 is a flowchart showing a method for manufacturing a surface-mount inductor according to an embodiment of the present invention. It is a graph which shows the relationship between the loop internal area (mm < ² >) of the conductor loop comprised by the electroconductive member shown in FIG. 1, and the change rate (%) of the inductance before and behind a conductor loop cutting | disconnection. (A)-(f) is a figure which shows the variation of the shape of the electroconductive member which comprises a conductor loop, and arrangement | positioning, respectively. (A)-(f) is a figure which shows the variation of the shape of the electroconductive member which comprises a conductor loop, and arrangement | positioning, respectively.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1A and 1B are schematic perspective views showing the external structure of a surface mount inductor 10 (coil component) according to an embodiment of the present invention. FIG. 1B shows the inductor 10 as viewed from the lower side of FIG.

  As illustrated in FIGS. 1A and 1B, the inductor 10 includes a drum core 11 and a single wire 12 wound around the drum core 11. The drum core 11 includes a rod-shaped core portion 11a and a pair of flange portions 11b and 11c provided at both ends of the core portion 11a, and has a structure in which these are integrated. The drum core 11 is preferably made of a magnetic material having a relatively high magnetic permeability and having no electrical conductivity, such as a sintered body of Ni—Zn ferrite, but has a relatively low magnetic permeability (μ = 2 to 10). ) It may be composed of Ni—Zn based ferrite, or may be composed of non-magnetic Ni—Zn based ferrite or alumina.

Each of the flange portions 11b and 11c is a substantially rectangular parallelepiped magnetic body having six surfaces. Hereinafter, as shown in FIG. 1, the six surfaces of the flange portion 11b are referred to as _{first to sixth} surfaces S1 to S6, and the _six surfaces of the flange portion 11c are seventh to twelfth surfaces. referred to as the S ₇ ~S _12. The first surface S ₁ and the sixth surface S ₆ , the second surface S ₂ and the fifth surface S ₅ , and the third surface S ₃ and the fourth surface S ₄ are respectively located on opposite sides. Similarly, the seventh surface S ₇ and the twelfth surface S ₁₂ , the eighth surface S ₈ and the eleventh surface S ₁₁ , and the ninth surface S ₉ and the tenth surface S ₁₀ are opposite to each other. To position. Core section 11a is connected to the flange portion 11b in the first surface _{S 1,} is connected to the flange 11c on the surface _{S 7} of the seventh. Also, the second surface S ₂ are terminal electrodes Eb (first terminal electrode) is formed, one end of the wire 12 to the terminal electrodes Eb is connecting wire by thermocompression bonding. Similarly, the surface S ₈ of the eighth terminal electrode Ec (second terminal electrode) is formed, the other end of the wire 12 to the terminal electrode Ec is connecting wire by thermocompression bonding. The terminal electrodes Eb and Ec are respectively formed on the entire surfaces of the second and eighth surfaces S ₂ and S ₈ as shown in FIG. The inductor 10 is mounted on the substrate with the second and eighth surfaces S ₂ and S ₈ facing the substrate (not shown).

  In the present embodiment, as shown in FIG. 1, the opposing direction of the pair of flanges 11b and 11c is the y direction, and the direction perpendicular to the y direction in the plane of the substrate on which the inductor 10 is mounted is the x direction. A direction perpendicular to both the x direction and the y direction is referred to as a z direction.

  The wire 12 is a covered conductor, and is wound around the core part 11a to constitute a coil conductor. The drum core 11 constitutes a magnetic path of a magnetic field generated by a current flowing through the wire 12.

On the surface S ₆ of the sixth flange portion 11b, the conductive members L constituting one conductor loop is formed. Conductive member L is a rectangular member, is formed only on the surface S ₆ of the sixth, not formed on the other surface.

The shape and arrangement of the conductive member L will be described more specifically. The conductive member L is constituted by _four linear conductive members L _{1 to} L ₄ connected to each other. Linear conductive member L ₁ is a little far from the boundary between the surface S ₅ of the fifth, it is formed parallel to the boundary. Linear conductive member L ₂ is a little far from the boundary between the fourth surface S _4, it is formed parallel to the boundary. Linear conductive member L ₃ is a little far from the second boundary surface S _2, it is formed parallel to the boundary. Linear conductive member L ₄ are, just off the boundary between the third surface S _3, it is formed parallel to the boundary. End of the fourth surface S ₄ side of the linear conductive member L ₁ is connected to an end portion of the fifth surface S ₅ side of the linear conductive member L _2. End of the third surface S ₃ side of the linear conductive member L ₁ is connected to an end portion of the fifth surface S ₅ side of the linear conductive member L _4. End of the fourth surface S ₄ side of the linear conductive member L ₃ is connected to an end portion of the second surface S ₂ side of the linear conductive member L _2. End of the third surface S ₃ side of the linear conductive member L ₃ is connected to an end portion of the second surface S ₂ side of the linear conductive member L _4.

  By providing the conductive member L as described above, the inductance of the inductor 10 is suppressed as compared with the case where the conductive member L is not provided. This will be described in detail below.

FIG. 2 is an explanatory diagram for explaining the effect of providing the conductive member L in the collar portion. When a current is passed through the wire 12, a magnetic field H0 that passes through the drum core 11 is generated as shown in FIG. The magnetic field H0 passes through the drum core 11 mainly in the y direction, and also passes through the _sixth surface S6 that is the end surface of the flange portion 11b in the y direction. Because the conductor loop is constituted by a conductive member L is formed on the surface S ₆ of the sixth magnetic field H0 will pass through the inside of the conductor loop.

  When such a magnetic field H0 changes due to a change in the current flowing through the wire 12, a loop current i that generates a magnetic field H1 in a direction that cancels the change flows through the conductor loop. Thereby, since the change of the magnetic field H0 is prevented, the inductance of the inductor 10 becomes small correspondingly. In other words, it can be said that in the inductor 10, the inductance is suppressed compared to the case where the conductive member L is not provided by forming the conductive member L constituting the conductor loop on the surface of the flange portion.

  Since the conductive member L forms a conductor loop, the inductor 10 can be easily formed by removing a part of the conductive member L (for example, the X portion shown in FIG. 1A). Can be cut. This removal may be performed by, for example, scraping off a portion to be removed with a tool such as a scissors. If the conductor loop is cut, the effect of suppressing the inductance by the loop current is lost, so that the inductance of the inductor 10 greatly increases. That is, in the inductor 10, the inductance can be greatly increased afterwards by a simple operation of scraping a part of the conductor loop.

  As described above, according to the inductor 10 according to the present embodiment, the inductance can be greatly increased afterwards by a simple operation of scraping off a part of the conductor loop. Compared to the case of using a metal film that covers all of the surrounding area (solid coating), the work time required for the subsequent change of the inductance can be shortened.

  Next, a method for manufacturing the inductor 10 according to the present embodiment will be described.

  FIG. 3 is a flowchart showing a method for manufacturing inductor 10 according to the present embodiment. In this manufacturing method, first, the inductor 10 shown in FIG. 1 is generated (step S1). In addition, what is necessary is just to form the part other than the electroconductive member L among the structures of the inductor 10 by the method as usual. The conductive member L may be formed by the same method as the formation of the terminal electrodes Eb and Ec, that is, by printing a conductor pattern (conductor film) on the surface of the drum core 11. You may carry out by sticking a conductive metal plate to. In the former case, it is preferable that the conductor pattern for the conductive member L is printed in the same process as the formation of the terminal electrodes Eb and Ec.

  Next, the inductance of the inductor 10 is measured (step S2). Then, it is determined whether or not the inductance obtained by the measurement in step S2 is within a predetermined range (within the standard value range) (step S3). As a result, if the inductance is within the predetermined range, the inductor 10 is shipped after performing other necessary inspections. On the other hand, if the inductance is not within the predetermined range, it is determined whether or not adjustment is possible by cutting the conductor loop (step S4). This determination preferably includes determination of whether or not an uncut conductor loop remains and determination of whether or not the inductance changed by cutting the conductor loop can fall within the predetermined range. In step S4, it is preferable to determine that adjustment is possible only when the results of these two determinations are both positive. For the latter determination, it is preferable to measure in advance the rate of change in inductance before and after cutting the conductor loop (details will be described later) using a plurality of samples.

  If it is determined in step S4 that adjustment is not possible, the inductor 10 is discarded. On the other hand, when it is determined that adjustment is possible, the conductor loop is cut by removing a part of the conductive member L by the method described above (step S5). Thereafter, the inductor 10 having an inductance within a predetermined range can be obtained by repeating the processing after step S2 again.

  As described above, according to the method of manufacturing inductor 10 according to the present embodiment, even if the inductance is not within the standard value range in the first measurement in step S2, the process of step S5 is performed. It becomes possible to put the inductance within the range of the standard value. Therefore, the yield of the process for manufacturing the inductor 10 is improved.

  Here, the relationship between the change rate of the inductance before and after the conductor loop cutting and the shape of the conductive member L will be described.

FIG. 4 is a graph showing a relationship between a loop internal area (mm ² ) of a conductor loop constituted by the conductive member L and an inductance change rate (%) before and after cutting the conductor loop. FIG 4, an inductor 10 having a conductive member L having the shape shown in FIG. 1 for both the sixth surface S ₆ and the 12 surface S ₁₂ of the height H and width W as shown in FIG. 1 The result of having measured the change rate of the inductance before and behind conductor loop cutting | disconnection about each of three different patterns is shown. However, the conductor width of the conductive member L was set to a constant value. Table 1 shows specific values of the loop internal area and inductance change rate shown in FIG. As shown in Table 1, the loop internal area in this case is twice the area (height H × width W) of the region surrounded by the conductive member L.

  As can be understood from FIG. 4, the rate of change of inductance before and after the conductor loop is cut varies depending on the loop inner area of the conductor loop. If this is utilized, it becomes possible to control the change rate of the inductance before and after cutting the conductor loop to a desired value by appropriately adjusting the loop internal area of the conductor loop. The same applies not only to the loop internal area of the conductor loop, but also to other shapes of the conductor loop. Therefore, when specifically determining the shape of the conductive member L, it is preferable to first determine the value of the inductance change rate and select a shape that can realize the determined value.

  5A to 5F and FIGS. 6A to 6F are diagrams showing variations in the shape and arrangement of the conductive member L, respectively. Each will be described in detail below. Each of these figures is a schematic perspective view when the inductor 10 according to the variation is viewed from the direction corresponding to FIG. Although not shown, in both variations, terminal electrodes Eb and Ec similar to those shown in FIG. 1B are formed on the second and eighth surfaces S2 and S8.

In the variation shown in FIG. 5A, the conductive member L ₁ formed on the fifth surface S ₅ , the conductive member L ₂ formed on the sixth surface S ₆ , and the second surface S ₂ The conductive member L is constituted by the terminal electrode Eb (see FIG. 1B) to be formed. The conductive member L constitutes one conductor loop by the conductive members L ₁ and L ₂ and the terminal electrode Eb.

To be more specific, the first conductive member L ₁ is a member of the U-shaped consisting of three linear conductive member L ₁₁ ~L ₁₃ which are connected to each other. The linear conductive members L ₁₁ and constitutes the bottom of the U-shaped member, is formed along a first boundary between the surface S _1. The linear conductive member L ₁₂ constitutes one arm of the U-shaped member, is formed along the boundary between the third surface S _3. Linear conductive member L ₁₃ constitutes the other arm of the U-shaped member, is formed along the boundary between the fourth surface S _4. On the other hand, the conductive member _{L 2} is constituted by two linear conductive members disposed apart _{L 21, L 22.} The linear conductive member L ₂₁ are formed along the boundary between the third surface S _3, is connected to one end of the linear conductive member L ₁₂ at one end, is connected to the terminal electrodes Eb at the other end. Linear conductive member L ₂₂ is formed along the boundary between the fourth surface S _4, is connected to one end of the linear conductive member L ₁₃ at one end, is connected to the terminal electrodes Eb at the other end. Thus, the conductor loop with a loop inner region and the surface S ₆ of the sixth leading to boundary between the second surface S ₂ is formed from the middle of the fifth surface S _5.

  According to this variation, it is possible to form a conductor loop having a wider loop inner region than the example of FIG. Therefore, it is possible to increase the rate of change in inductance before and after the conductor loop is cut. Further, the terminal electrode Eb can be effectively used as a part of the conductor loop.

In the variation shown in FIG. 5B, the conductive member L is constituted by the conductive member L ₁ formed on the fifth surface S ₅ and the conductive member L ₂ formed on the sixth surface S _6. The The conductive member L constitutes one conductor loop by these conductive members L ₁ and L ₂ .

To be more specific, the first conductive member L ₁ is a member of the U-shaped consisting of three linear conductive member L ₁₁ ~L ₁₃ which are connected to each other. Each linear conductive member _L 11 _{~L 13,} has the same configuration as the linear conductive member _L 11 _{~L 13} in variation shown in Figure 5 (a). On the other hand, the conductive member L ₂ is, in this variation, a member of the U-shaped consisting of three linear conductive member L ₂₁ ~L ₂₃ which are connected to each other. The linear conductive members L ₂₁ and constitutes the bottom of the U-shaped member, at a short distance from a second boundary between the surface S _2, is formed parallel to the boundary. Linear conductive member L ₂₂ constitutes one arm of the U-shaped member, is formed along the boundary between the third surface S _3. The end of the linear conductive member L ₂₂ on the fifth surface S ₅ side is connected to one end of the linear conductive member L ₁₂ . The linear conductive member L ₂₃ constitutes the other arm of the U-shaped member, is formed along the boundary between the fourth surface S _4. Fifth end surface S ₅ side of the linear conductive member L ₂₃ is connected to one end of the linear conductive member L _13. Conductive member L _2, the terminal electrode Eb formed on the second surface S ₂ is not connected. With the above configuration, the conductor loop with a loop inner region extending to the middle of the surface S ₆ of the sixth is formed from the middle of the fifth surface S _5.

  Also according to this variation, it is possible to form a conductor loop having a wider loop inner region than in the example of FIG. 1, so that it is possible to increase the rate of change in inductance before and after cutting the conductor loop.

In a variation shown in FIG. 5 (c) ~ FIG 5 (f), as in the example shown in FIG. 1, only on the surface S ₆ of the sixth rectangular conductive member L is formed. In the variation shown in FIG. 5C, the conductor width is the same as that in the example shown in FIG. 1, but the area of the loop inner region of the conductive member L is larger. Accordingly, the outer periphery also becomes larger, and the outer periphery of the conductive member L is in contact with the boundaries with the third, fourth, and fifth surfaces S ₃ , S ₄ , S ₅ . In the variation shown in FIG. 5D, the conductor width is the same as that of the example shown in FIG. 1, but the area of the loop inner region of the conductive member L is smaller. In the variation shown in FIG. 5E, the conductor width is thicker than in the example shown in FIG. On the other hand, in the variation shown in FIG. 5F, the conductor width is narrower than that in the example shown in FIG. Thus, the area and the conductor width of the loop inner region of the conductive member L can be freely selected, and by doing so, the inductance change rate before and after the conductor loop cutting can be freely adjusted.

The variation shown in FIG. 6A is an example in which a rectangular conductive member L similar to the example shown in FIG. 1 is formed on the _fifth surface S5. Moreover, the variation shown in FIG. 6B is an example in which a rectangular conductive member L similar to the example shown in FIG. 1 is formed on the _third surface S ₃ . Thus, the conductive member L are not necessarily must necessarily formed on the surface S ₆ of the sixth, third, it may be formed on the surface S _3, S ₅ of the fifth. Of course, it may be formed on the fourth surface S _4, plurality may be formed of the surfaces S ₃ to S ₅ of the third to fifth. Because the surface S ₃ to S ₅ of the third to fifth at the surface S ₆ of the sixth amount of magnetic flux passing through different forms of doing so, the conductive member L to the surface S ₆ of the sixth It is possible to obtain an inductance change rate different from the case.

Variation shown in FIG. 6 (c), an example of forming the conductive member L elliptical only on the surface S ₆ of the sixth. As shown in this example, the conductor loop does not necessarily have to be a rectangle, and it is preferable to select an optimum shape according to a desired inductance change rate such as a circle, an ellipse, or a triangle. In the present variation, although the conductive member L formed on the surface S ₆ of the 6 shows an example of an oval, surface S ₃ to S ₅ of the third to fifth, are formed on the other surface Needless to say, the shape of the conductive member L may be similarly changed.

In the variation shown in FIG. 6D, a conductive member is formed by a rectangular conductive member L ₁ formed on the sixth surface S ₆ and a linear conductive member L ₂ formed inside the conductive member L _1. L is configured. Specific shape and arrangement of the conductive member L ₁ is the same as the conductive member L shown in FIG. Linear conductive member L ₂ is across the inside of the conductive member L ₁ in the z-direction. Accordingly, the conductive member L according variation constitutes two conductors loops Wakata by linear conductive member L _2.

Further, in the variation shown in FIG. 6 (e), the conductive by a rectangular conductive member L ₂ formed on the surface S ₁₁ of the rectangular conductive member L _1, and 11 formed on the surface S ₅ of the fifth The sex member L is configured. Specific shape and arrangement of the conductive member L ₁ is the same as the conductive member L shown in Figure 6 (a). Moreover, the specific shape and arrangement of the conductive member L ₂ also, except that is formed on the surface S ₁₁ of the fifth surface S ₅ instead 11, the illustrated conductive FIGS. 6 (a) The same as the member L. Therefore, the conductive member L according to this variation also forms two conductor loops.

Furthermore, in the variation shown in FIG. 6F, the conductive member L ₁ formed on the fifth surface S ₅ , the conductive member L ₂ formed on the sixth surface S ₆ , and the second surface S. _The conductive member L is constituted by the terminal electrode Eb (see FIG. 1B) formed on the substrate 2. Specific shape and arrangement of the conductive member L ₁ is the same as the conductive member L ₁ shown in Figure 5 (a). On the other hand, the conductive member L ₂ connects the linear conductive members L ₂₁ and L ₂₂ to the conductive member L ₂ shown in FIG. 5A in the middle of the sixth surface S ₆ in the x direction. It has added structural linear conductive member L _23. Accordingly, the conductive member L according variation, conductor constituted a conductor loop formed by a portion of the conductive member L ₂ and the terminal electrode Eb of a part and the conductive member L ₁ of the conductive member L ₂ Two conductor loops composed of a loop are formed.

  As shown by the variations shown in FIGS. 6D to 6F, the conductive member L formed on the surfaces of the flange portions 11b and 11c is formed so as to constitute two or more conductor loops. Also good. By doing so, it is possible to determine whether or not to cut each conductor loop, so that the inductance of the inductor 10 can be adjusted in a plurality of stages. When two or more conductor loops are used in this way, according to the method for manufacturing the inductor 10 described above, one conductor loop is cut each time step S5 is passed, thereby providing a stepwise process. It is possible to increase the inductance.

  Further, as shown in FIG. 6E, the conductive member L may be provided not only on the flange portion 11b but also on the flange portion 11c. In this case, the shape and arrangement of the portion formed on the flange portion 11b and the flange The shape and arrangement of the part formed in the part 11c may be the same as shown in FIG. 6 (e) or may be different. For example, a conductive member according to the variation shown in FIG. 5 (a) is formed on the flange portion 11b, and a conductive member according to the variation shown in FIG. 5 (b) is formed on the flange portion 11c. It is good also as forming the electroconductive member from which at least one of a shape and arrangement | positioning differs by the collar part 11b and the collar part 11c.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to such embodiment at all, and this invention can be implemented in various aspects in the range which does not deviate from the summary. Of course.

  For example, in the above embodiment, the coil component which is an inductor has been described as an example, but if the present invention is a surface mount type configured using a drum core, a common mode filter, a pulse transformer, a balun transformer, etc. The present invention can be widely applied to other types of coil parts. In addition, in a coil component that needs to form a plurality of terminal electrodes on one collar, it is not possible to configure one large conductor loop using terminal electrodes as in the variation shown in FIG. Although it is difficult, there is no problem in forming a conductor loop for each terminal electrode.

Eb, Ec Terminal electrodes L, L ₁ , L ₂ , L _{11 to} L ₁₃ , L _{21 to} L ₂₃ Conductive members S _{1 to} S ₁₂ First to twelfth surfaces 10 Inductor 11 Drum core 11a Winding portion 11b, 11c Buttock 12 wire

Claims (1)

A drum core having a core part and a pair of flanges provided at both ends of the core part;
One or a plurality of wires wound around the core,
A first terminal electrode provided on one of the pair of flanges, to which one end of each of the one or more wires is connected;
A second terminal electrode provided on the other of the pair of flanges and connected to the other end of each of the one or more wires;
A conductive member provided on at least one surface of the pair of flanges and constituting at least one conductor loop, the conductive member not being connected to the first and second terminal electrodes ; Prepared,
The one of the pair of flanges is a substantially rectangular parallelepiped magnetic body having first to sixth surfaces,
The other of the pair of flanges is a substantially rectangular parallelepiped magnetic body having seventh to twelfth surfaces,
The first surface and the sixth surface, the second surface and the fifth surface, the third surface and the fourth surface are respectively located on opposite sides;
The seventh surface and the twelfth surface, the eighth surface and the eleventh surface, the ninth surface and the tenth surface are respectively located on opposite sides;
The core portion is connected to the one of the pair of flange portions on the first surface, and is connected to the other of the pair of flange portions on the seventh surface,
The first terminal electrode is formed on the second surface,
The second terminal electrode is formed on the eighth surface,
The conductive member is formed on at least the fifth and sixth surfaces,
Said conductive member, said a portion formed to the fifth surface, the sixth coil part, characterized that you configure one conductor loop by the portion formed on the surface of the.

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