JP6969260B2 - Electronic clock - Google Patents

Description

The present invention relates to an electronic clock including a solar cell.

Conventionally, an electronic clock is provided with a solar cell formed by laminating a semiconductor layer and electrodes on the back surface side of a dial having light transmission, and an antenna for receiving satellite signals is provided on the back cover side of the solar cell. (See, for example, Patent Documents 1 and 2).

In the electronic clock of Patent Document 1, the solar cell includes a plurality of solar cells formed by laminating a semiconductor layer and electrodes. The solar cell is provided at a position where it does not overlap with the antenna in a plan view seen from the dial side so that the radio waves received by the antenna are not blocked by the electrodes of the solar cell. In the solar cell, the semiconductor layer has a deep purple color, and when the dial is viewed from the surface side, the color of the solar cell can be seen through the dial. Therefore, in the electronic clock of Patent Document 1, when the dial is viewed from the surface side, the color looks different between the region where the solar cell is provided and the region where the solar cell is not provided. In the electronic timepiece, a light-shielding sheet having a colored portion is provided on the back surface side of the dial at a position where the solar cell is not provided in the plan view so as to eliminate this color difference.

In the electronic clock of Patent Document 2, the solar cell includes one solar cell formed by laminating a semiconductor layer and electrodes. In the electronic clock of the second embodiment, the solar cell is also provided at a position overlapping with the antenna in a plan view seen from the dial side. In the electronic timepiece, a metal electrode and a transparent electrode are not provided at a portion overlapping the antenna of the solar cell in the plan view so that the radio wave received by the antenna is not blocked by the electrode of the solar cell. A semiconductor layer is provided at a position overlapping the antenna of the solar cell so that the colors are the same as a whole. Therefore, when the dial is viewed from the surface side, the colors of the solar cells appear to be the same as a whole even when the color of the solar cell is seen through the dial.

Japanese Unexamined Patent Publication No. 2012-21895 Japanese Unexamined Patent Publication No. 2010-96707

By the way, in an electronic watch in which a solar cell has a plurality of solar cells, when the dial is viewed from the surface side, a region provided with a solar cell (a portion where a metal layer, a semiconductor layer and a transparent electrode are laminated) and an antenna are provided. It is desired that the area where the solar cell is not provided and the area where the cell division portion located between the solar cells is provided looks the same color.
However, in the electronic clock of Patent Document 1, since the colored portion is not provided in the cell division portion, when the dial is viewed from the surface side, the region where the cell division portion is provided and the solar cell are provided. There is a problem that the colors look different in the provided area and the area overlapping with the antenna. Further, a light-shielding sheet, which is a separate member other than the solar cell, is required, and there are problems that the structure is complicated to fix the light-shielding sheet, the electronic clock becomes thick, and the cost increases.
Further, in the electronic clock of Patent Document 2, the solar cell is provided with one solar cell, and when the solar cell is viewed from the surface side of the dial through the dial, the area where the cell division portion is provided and the solar are obtained. No attention has been paid to making the area where the cell is provided and the area where the antenna overlaps look the same color.

An object of the present invention is to provide an electronic timepiece that can improve the appearance of a dial when viewed from the surface side.

The electronic clock of the present invention includes a dial having light transmission, a solar cell provided on the back surface side of the dial, and an antenna provided on the back surface side of the solar cell for receiving radio waves. The solar cell includes a plurality of solar cells that generate power, a first non-power generation unit that transmits radio waves received by the antenna, and a second non-power generation unit that is a cell division unit provided between the solar cells. The solar cell comprises a metal electrode, a semiconductor layer laminated on the dial side of the metal electrode, and a transparent electrode laminated on the dial side of the semiconductor layer. The power generation unit and the second non-power generation unit are not provided with the metal electrode and the transparent electrode, respectively, and are provided with the semiconductor layer at least in a part thereof.

In the present invention, since the solar cell includes a first non-power generation unit that transmits radio waves received by the antenna, the reception performance of the antenna can be improved.
Further, since a semiconductor layer is provided at least a part of the first non-power generation part and at least a part of the second non-power generation part which is a cell division part, at least a part of the first non-power generation part is provided. When the solar cell is viewed from the surface side of the dial through the dial, with almost no color difference between the region where it is located, the region where at least a part of the second non-power generation unit is located, and the region where the solar cell is located. The difference in color can be almost eliminated and the appearance can be improved.
For example, if there is a part of the first non-power generation part that overlaps with the dial ring, case, etc. of the electronic watch when viewed from the surface side and is not visible, the semiconductor layer is not provided in that part. You may.
Further, for example, when there is a portion of the second non-power generation portion whose dimension along the facing direction of the adjacent solar cells is equal to or less than a predetermined dimension, the color of the region where the portion is located is the region where the solar cell is located. Even if it is different from the color, the difference in color is not noticeable. Therefore, it is not necessary to provide a semiconductor layer in the portion.

In the electronic clock of the present invention, in the solar cell, the solar cell is provided inside the outer peripheral edge, and the solar cell includes a third non-power generation unit between the solar cell and the outer peripheral edge. It is preferable that the metal electrode and the transparent electrode are not provided in the third non-power generation unit, and the semiconductor layer is provided at least in a part thereof.

In the present invention, since the semiconductor layer is also provided in at least a part of the third non-power generation part, the region where at least a part of the first non-power generation part is located and at least a part of the second non-power generation part are located. When the solar cell is viewed from the surface side of the dial through the dial, the color difference between the area where the solar cell is located, the area where at least a part of the third non-power generation unit is located, and the area where the solar cell is located is almost eliminated. The difference in color can be almost eliminated, and the appearance can be further improved.
For example, if there is a part of the third non-power generation part that overlaps with the dial ring, case, etc. of the electronic watch when viewed from the surface side and is not visible, the semiconductor layer is not provided in that part. You may.

In the electronic clock of the present invention, it is preferable that the first non-power generation unit overlaps with at least the antenna in a plan view seen from the dial side.

According to the present invention, since the radio wave incident from the dial side of the antenna is not blocked by the electrode of the solar cell, the reception performance of the antenna can be improved regardless of the type of antenna such as a patch antenna or a bar antenna. ..

In the electronic clock of the present invention, the antenna is preferably a patch antenna.

Since the patch antenna has a larger size than, for example, a bar antenna, in a solar cell, when an electrode is provided, the receiving performance of the antenna deteriorates in a wide range. That is, it is necessary to provide the first non-power generation unit in a wide range. Therefore, the color difference between the area where at least a part of the first non-power generation unit is located and the area where the solar cell is located is almost eliminated, and the color when the solar cell is viewed from the surface side of the dial through the dial. The appearance can be effectively improved by almost eliminating the difference between the two.

In the electronic clock of the present invention, the antenna is a patch antenna provided with a radiating electrode, and the solar cell has the inside of the outer peripheral edge of the radiating electrode in a plan view seen from the dial side. It is preferable that the semiconductor layer and the transparent electrode having a size smaller than that of the radiation electrode are provided, and the first non-power generation unit is provided so as to surround the transparent electrode in the plan view.

In a patch antenna, since the current is concentrated on the outer peripheral edge of the radiation electrode, electric lines of force are generated from the outer peripheral edge. Therefore, in the plan view, even if the electrode is provided inside the outer peripheral edge of the solar cell, the influence of the electrode on the reception performance of the antenna is small.
Further, the transparent electrode is provided with a region in which the transparent electrode is provided and a transparent electrode in order to absorb the light incident on the semiconductor layer from the dial side and the light reflected by the semiconductor layer on the dial side. The colors look slightly different from the areas that are not.
Therefore, in the present invention, a semiconductor layer and a transparent electrode are provided at a position inside the outer peripheral edge of the solar cell to reduce the color difference between the position and the position where the solar cell is provided. Then, a first non-power generation unit is provided at a position surrounding the transparent electrode in the plan view.
According to this configuration, the area of the first non-power generation unit can be reduced as compared with the case where the first non-power generation unit overlaps with the antenna in a plan view. Since the transparent electrode is not provided in the first non-power generation unit, the color looks slightly different between the position where the first non-power generation unit of the solar cell is located and the position where the solar cell is located. According to the present invention, since the area of the first non-power generation unit can be reduced, this color difference can be made inconspicuous.

In the electronic clock of the present invention, in the plan view, it is preferable that the solar cell is provided with the metal electrode having a size smaller than that of the radiation electrode inside the outer peripheral edge of the radiation electrode.

In a solar cell, the light reflected by the metal electrode passes through the semiconductor layer and the transparent electrode and is emitted to the dial side, so that the color is slightly different between the region with the metal electrode and the region without the metal electrode. Looks different.
In the present invention, since the metal electrode, the semiconductor layer, and the transparent electrode are provided inside the outer peripheral edge of the radiation electrode in the solar cell as in the case of the solar cell, the region inside the outer peripheral edge of the radiation electrode and the solar The area where the cell is located can be the same color.

In the electronic clock of the present invention, the first non-power generation unit is continuous to the outer peripheral edge of the solar cell in a plan view seen from the dial side, and in the plan view, the first non-power generation unit is the antenna. It is preferable that it overlaps with.

According to the present invention, the antenna can be arranged closer to the case in the plan view as compared with the case where the solar cell is provided on the outer peripheral side of the solar cell with respect to the first non-power generation unit, and the degree of freedom in the arrangement of the antenna is improved. can.

In the electronic clock of the present invention, it is preferable that the outer peripheral edge of the antenna is surrounded by the solar cell in a plan view seen from the dial side.

According to the present invention, in the plan view, the area on the outer peripheral side of the solar cell on the outer peripheral side can function as a solar cell, so that the area of the solar cell can be increased and the power generation capacity of the solar cell can be improved.

In the electronic clock of the present invention, in a plan view seen from the dial side, the solar cell has two lines extending radially from the plane center of the solar cell and along the outer peripheral edge of the solar cell, respectively. It is preferable that the antenna has a shape surrounded by a vertical line and the antenna is located at a position that does not overlap with the solar cell in the plan view.

In the present invention, each solar cell has a substantially fan-shaped shape in the plan view. According to this configuration, it is easy to design each solar cell in the same area. Further, when the metal electrode or the transparent electrode corresponding to each solar cell is patterned by laser processing, the length cut by the laser can be minimized, so that the manufacturing process can be shortened.

The electronic clock of the present invention preferably includes a metal case.

According to the present invention, since the antenna can receive radio waves transmitted through the dial, a metal case can be used for the case, and the appearance of the electronic timepiece can be improved.

The electronic watch of the present invention preferably has a non-conductive bezel.

According to the present invention, the reception performance of the antenna can be improved as compared with the case where the conductive bezel is provided.

The plan view of the electronic clock of 1st Embodiment which concerns on this invention. Sectional drawing of the electronic clock in 1st Embodiment. The perspective view of the antenna in 1st Embodiment. A plan view of the antenna in the first embodiment as viewed from the back surface side. The figure which shows the antenna provided on the circuit board in 1st Embodiment. The figure which shows the circuit structure of the electronic clock in 1st Embodiment. The plan view which shows the solar cell and the dial receiving ring in 1st Embodiment. The sectional view of the 1st non-power generation part of the solar cell and the antenna in 1st Embodiment. The sectional view of the 2nd non-power generation part of the solar cell in 1st Embodiment. The sectional view of the 3rd non-power generation part of the solar cell in 1st Embodiment. The plan view of the solar cell of the 2nd Embodiment which concerns on this invention. The sectional view of the 1st non-power generation part of the solar cell and the antenna in 2nd Embodiment. The graph which shows the light transmittance of a transparent electrode. The cross-sectional view of the first non-power generation part of the solar cell and the antenna of the 3rd Embodiment which concerns on this invention. The cross-sectional view of the 2nd non-power generation part of the solar cell of the modification 2 which concerns on this invention. The plan view of the solar cell of the modification 3 which concerns on this invention. The plan view of the solar cell of the modification 4 which concerns on this invention. The plan view of the solar cell of the modification 5 which concerns on this invention. The plan view of the solar cell of the modification 6 which concerns on this invention. The plan view of the solar cell of the modification 7 which concerns on this invention. The perspective view of the antenna of the modification 8 which concerns on this invention. The plan view of the electronic clock of the modification 9 which concerns on this invention. The plan view of the solar cell of the modification 9 which concerns on this invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
The electronic clock 1 (see FIG. 1) of the present embodiment is a wristwatch that receives radio waves (satellite signals) from GPS satellites and corrects the internal time, and is the opposite side (front surface) of the side (back surface side) that comes into contact with the arm. Display the time on the side).
GPS satellites are navigation satellites that orbit in a predetermined orbit over the earth, and transmit navigation messages on the ground by superimposing a navigation message on radio waves (L1 wave) of 1.57542 GHz. In the following description, the radio wave of 1.57542 GHz on which the navigation message is superimposed is referred to as a satellite signal. The satellite signal is a circularly polarized wave with right-handed polarized waves.

There are about 30 GPS satellites. In order to identify from which GPS satellite the satellite signal was transmitted, each GPS satellite superimposes a unique pattern of 1023 chips (1 ms period) called a C / A code (Coarse / Acquisition Code) on the satellite signal. The C / A code looks like a random pattern, with each chip being either +1 or -1. Therefore, the C / A code superimposed on the satellite signal can be detected by correlating the satellite signal with the pattern of each C / A code.

GPS satellites are equipped with an atomic clock, and the satellite signals include GPS time information measured by the atomic clock. The electronic clock 1 receives a satellite signal transmitted from one GPS satellite, and sets the time (time information) obtained by using the GPS time information contained therein as the internal time.

The satellite signal also includes orbital information indicating the position of the GPS satellite in orbit. The electronic clock 1 can perform positioning calculation using GPS time information and orbit information. The positioning calculation is performed on the premise that the internal time of the electronic clock 1 includes a certain error. That is, in addition to the x, y, and z parameters for specifying the three-dimensional position of the electronic clock 1, the time error is also unknown. Therefore, the electronic clock 1 generally receives satellite signals transmitted from each of four or more GPS satellites, performs positioning calculation using the GPS time information and orbit information contained therein, and performs positioning calculation at the current location. Ask for location information.

[Rough configuration of electronic clock]
Next, the schematic configuration of the electronic clock 1 will be described. FIG. 1 is a plan view of the electronic clock 1. FIG. 2 is a cross-sectional view of the electronic clock 1.
The electronic timepiece 1 includes an outer case 30, a cover glass 33, and a back cover 34. The outer case 30 is configured by fitting a bezel 32 to a cylindrical case 31 (metal case) made of metal. The bezel 32 may be made of metal or ceramic. If it is ceramic, it is non-conductive and has low conductivity, so it does not shield radio waves. On the inner peripheral side of the bezel 32, a ring-shaped dial ring 35 made of a non-conductive resin and a dial 11 formed of a non-conductive member such as polycarbonate in a disk shape are a time display portion. Is arranged as.
On the side surface of the outer case 30, an A button 2 is provided at a position in the 2 o'clock direction, a B button 3 is provided at a position in the 4 o'clock direction, and a crown 4 is provided at a position in the 3 o'clock direction from the center of the plane of the dial 11. ing.

Of the two openings of the outer case 30, the opening on the front surface side is closed by the cover glass 33 via the bezel 32, and the opening on the back surface side is closed by the back cover 34 made of metal. ..
Inside the outer case 30, a dial ring 35 attached to the inner circumference of the bezel 32, a dial 11 having light transmission, pointers 21, 22, 23, 24, and pointers 21 to 23 are attached. A pointer shaft 25 (three guide shafts provided coaxially) and a guide shaft 26 to which the pointer 24 is attached are provided. Further, a solar cell 50, an antenna 110, a dial receiving ring 126, a main plate 125, a sun wheel 130, a sun wheel holder 131, a drive mechanism 140 for driving pointers 21 to 24, and the like are provided. (Contained).
The pointer shaft 25 is provided along the center axis extending in the front-back direction through the center of the plane of the outer case 30. The pointer shaft 26 passes through a position deviated from the center in the 6 o'clock direction and is provided along the center axis.

The dial ring 35 has an outer peripheral end in contact with the inner peripheral surface of the bezel 32, and has a flat plate portion parallel to the cover glass 33 and an inclined portion inclined toward the dial 11.

The dial 11 is a circular plate material that displays the time inside the outer case 30, is made of a light-transmitting material such as resin, which is a non-conductive material, and is formed between the dial and the cover glass 33 with the pointers 21 to 21. 24 and the like are provided, and are arranged on the back surface side of the dial ring 35.
A logo 12 is provided on the surface side of the dial 11. The logo 12 is a character, a number, or a mark indicating a product name or a manufacturer name, and is formed of a non-conductive member such as a resin or a conductive member. The logo 12 may be formed by printing. If the logo 12 is on the surface side of the solar cells 51 to 58 described later of the solar cell 50, the amount of light incident on the solar cells 51 to 58 decreases, so that the logo 12 does not overlap with the solar cells 51 to 58 in a plan view. It is desirable to be placed in.
Here, viewing the members constituting the electronic clock 1 from a direction perpendicular to the dial 11 is referred to as plan view.
When the logo 12 is made of a conductive material and overlaps with the antenna 110 in a plan view, the logo 12 is placed at a position that does not affect the reception of radio waves or is formed in a size that does not affect the reception of radio waves. It is desirable to do it. As long as it does not affect the reception of radio waves, it may overlap with the outer peripheral edge of the radiation electrode 112 of the antenna 110.

A solar cell 50 is provided on the back surface side of the dial 11. The solar cell 50 is arranged between the dial 11 and the main plate 125. When the solar cell 50 is viewed from the surface side of the dial 11 through the dial 11, the light transmittance of the dial 11 is set to about 30% or less, so that the dial 11 is not completely transparent. If there is a partial color difference in the solar cell 50, the color difference will be identified. If the partial color difference of the solar cell 50 is slight, the color difference is not recognized. Further, the texture of the entire dial 11 when viewed from the surface side of the dial 11 is unified. In addition, in order to make it difficult for the solar cell 50 to show through when the dial 11 is viewed from the surface side, a semi-transparent property that transmits a part of light and reflects a part between the dial 11 and the solar cell 50 is semi-transparent. A sheet may be provided.
The solar cell 50 has a plurality of solar cells 51 to 58 that perform photovoltaic power generation that converts the light energy of light transmitted through the dial 11 into electric energy (electric power). The solar cell 50 also has a function of detecting sunlight. The details of the solar cell 50 will be described later.
The dial 11 has a high light transmittance in order to obtain a large amount of electric energy by the solar cell 50, and further enhances the decorativeness. Therefore, when the solar cell 50 is transparent and difficult to see, the light transmittance is increased. make low. Even if the solar cell 50 can be seen through, if the color of the entire solar cell 50 is uniform, the decorativeness is not impaired, so that the light transmittance can be increased and a large amount of solar energy can be obtained. If more solar energy can be stored in the secondary battery 128, it will be possible to effectively use functions that consume a large amount of current, such as the battery life of the electronic clock 1 and GPS reception.
A guide plate (not shown) for fixing the solar cell 50 is provided inside the outer case 30. The guide plate is provided with a positioning portion for positioning the solar cell 50. The guide plate is provided on the back surface side of the solar cell 50, and the guide plate reinforces the solar cell 50 and reduces warpage. The guide plate is made of polycarbonate or a metal plate which is a non-conductive material. When it is formed of a metal plate, it is formed in a shape that does not overlap with the antenna 110 in a plan view so as not to shield the radio waves received by the antenna 110.

An antenna 110 for receiving radio waves is provided on the back surface side of the solar cell 50.
FIG. 3 is a perspective view of the antenna 110 as viewed from the front surface side, and FIG. 4 is a plan view of the antenna 110 as viewed from the back surface side.
GPS satellites transmit satellite signals with right-handed circularly polarized waves. Therefore, the antenna 110 is composed of a patch antenna (also referred to as a microstrip antenna) having excellent circularly polarized wave characteristics.
As shown in FIG. 3, the antenna 110 of the present embodiment has a conductive radiation electrode 112 having a substantially square shape in a plan view on the surface side of a ceramic dielectric base material 111 having a substantially square shape in a plan view. It is a stacked patch antenna. The radiation electrode 112 determines the frequency of the antenna 110 and the polarization of the signal to be received.

The radiation electrode 112 is formed to be smaller in size than the dielectric base material 111, and on the surface of the dielectric base material 111, an exposed surface 111A on which the radiation electrode 112 is not laminated is provided around the radiation electrode 112. Has been done.
Further, as shown in FIG. 4, a feeding electrode 114 and a plurality of ground electrodes 115 are provided on the back surface side of the dielectric base material 111. Further, as shown in FIG. 3, a side electrode 113 connected to the feeding electrode 114 is provided on the side surface of the dielectric base material 111.

Such an antenna 110 can be manufactured as follows.
First, barium titanate having a relative permittivity of about 60 to 150 is molded into a desired shape by a press machine using barium titanate as a main raw material, and a dielectric base material 111 is produced through firing.
Then, the radiation electrode 112 is formed on the surface side of the dielectric base material 111 mainly by screen printing a paste material such as silver (Ag). The side electrode 113, the feeding electrode 114, and the ground electrode 115 are also formed by the same method.
Then, as shown in FIG. 5, the antenna 110 manufactured in this way is mounted on the circuit board 120 formed in the shape of a disk. As shown in FIG. 5, the circuit board 120 is provided with a notch portion 120A, and the secondary battery 128 is housed in the notch portion 120A.

As shown in FIG. 2, the back surface side of the dial 11 is further provided with a dial receiving ring 126 for holding the dial 11. The dial receiving ring 126 is made of resin. The dial receiving ring 126 has a ring shape along the inner peripheral surface of the outer case 30. The solar cell 50 is arranged inside the inner peripheral surface of the dial receiving ring 126 in a plan view.

Between the main plate 125 and the solar cell 50, a sun wheel 130 and a sun wheel holder 131 for holding the sun wheel 130 are provided. The day wheel 130 and the day wheel holder 131 are made of a non-conductive resin.

The dial 11, the solar cell 50, the date wheel holder 131, and the main plate 125 are formed with holes through which the pointer shafts 25 and 26 pass. Further, the dial 11 and the solar cell 50 are formed with an opening of a calendar small window 19 (see FIG. 1).

The main plate 125 is made of a non-conductive resin and has a mounting portion for the drive mechanism 140. The drive mechanism 140 is attached to the main plate 125 and is covered with the circuit board 120 from the back surface side. The drive mechanism 140 has a step motor and a train wheel such as a gear, and the guide points 21 to 24 are driven by the step motor rotating the pointer shafts 25 and 26 via the wheel train.

The circuit board 120 is provided with a GPS receiving unit 122, a control device 150, and an antenna 110. Further, the circuit board 120 is connected to a secondary battery 128 (see FIG. 5) such as a lithium ion battery that is charged by the electric power generated by the solar cell 50.
A circuit retainer 123 is provided on the back surface side of the circuit board 120.

[Display mechanism of electronic clock]
As shown in FIG. 1, on the inner peripheral side of the dial ring 35 surrounding the outer peripheral portion of the dial 11, a scale for dividing the inner circumference into 60 is indicated. Using this scale, the pointer 21 normally displays "seconds", the pointer 22 displays "minutes", and the pointer 23 displays "hours".
Further, on the dial ring 35, the alphabet "Y" is written at the 12-minute position and the alphabet "N" is written at the 18-minute position. This alphabetic character indicates the reception (acquisition) result (Y: reception (acquisition) success, N: reception (acquisition) failure) of various information based on the satellite signal received from the GPS satellite. The pointer 21 indicates either "Y" or "N" and displays the reception result of the satellite signal. The reception result is displayed by pressing the A button 2 for less than 1 second.

The pointer 24 is attached to a pointer shaft 26 provided at a position in the 6 o'clock direction from the center of the plane of the dial 11. Numbers, letters, and symbols are provided outside the rotation area of the pointer 24 on the dial 11, and the pointer 24 can indicate the remaining battery level, the day of the week, and DST ON / OFF. , Information such as light detection by the solar cell 50 is displayed. The pointer 24 normally indicates the remaining battery level.

The calendar small window 19 is provided in an opening in which the dial 11 is opened in a rectangular shape, and the numbers written on the date wheel 130 can be visually recognized from the opening. This number represents the "day" of the date. The solar cell 50 is also provided with a rectangular opening so as to match the opening of the dial 11.

Further, on the dial ring 35, along the scale on the inner peripheral side, the time difference information 36 indicating the time difference from Coordinated Universal Time (UTC) is represented by a number and a symbol other than the number. The numerical time difference information 36 is an integer time difference, and the symbol time difference information 36 is a time difference other than an integer. The time difference between the time displayed by the pointers 21 to 23 and UTC can be confirmed by the time difference information 36 indicated by the pointer 21 by pressing the B button 3.
Further, on the bezel 32 provided around the dial ring 35, the city information 37 representing the representative city name of the time zone using the standard time corresponding to the time difference of the time difference information 36 written on the dial ring 35. However, it is also described in the time difference information 36. Here, the notation of the time difference information 36 and the city information 37 is called a time zone display. In this embodiment, a time zone display equal to the number of time zones used in the world is shown. The notation of the city name shown in FIG. 1 is an example, and the city name may be changed as appropriate according to the change of the time zone.

[Circuit configuration of electronic clock]
Next, the circuit configuration of the electronic clock 1 will be described.
As shown in FIG. 6, the electronic clock 1 includes a control device (CPU) 150 having a control unit 151, a backflow prevention diode 152, and a charge control transistor 153 as basic configurations, a GPS receiving unit 122, a storage unit 124, and an input unit. It is equipped with 127 and peripheral devices of the drive mechanism 140. Each of these devices sends and receives data via the data bus. The input unit 127 includes an A button 2, a B button 3, and a crown 4 shown in FIG.

The backflow prevention diode 152 prevents current from flowing from the secondary battery 128 to the solar cell 50 when the solar cell 50 is not irradiated with light.
The charge control transistor 153 switches the solar cell 50 and the secondary battery 128 into a connected state or a non-connected state according to the instruction of the control unit 151. The secondary battery 128 deteriorates when it is further charged from a fully charged state to an overcharged state. When the voltage of the secondary battery 128 reaches a predetermined voltage, the control unit 151 can prevent the secondary battery 128 from being overcharged by controlling the charge control transistor 153 to make it unconnected. ..

The GPS receiving unit 122 processes the satellite signal received via the antenna 110 to acquire GPS time information and position information. The antenna 110 receives satellite signals transmitted from a plurality of GPS satellites orbiting the earth in a predetermined orbit and passing through the cover glass 33. The GPS receiving unit 122 executes a timed reception process for acquiring GPS time information when the A button 2 is pressed for 1 second or longer, and a positioning reception process for acquiring position information when the A button 2 is pressed for 3 seconds or longer. To execute.

Although not shown, the GPS receiving unit 122 correlates with the RF (Radio Frequency) unit that receives a satellite signal transmitted from a GPS satellite and converts it into a digital signal, like a normal GPS device, and the received signal. GPS time information and position information (positioning information) are acquired and output based on the BB section (baseband section) that executes the determination and demodulates the navigation message and the navigation message (satellite signal) demodulated by the BB section. It has an information acquisition unit.

The RF unit includes a bandpass filter, a PLL circuit, an IF filter, a VCO (Voltage Controlled Oscillator), an ADC (A / D converter), a mixer, an LNA (Low Noise Amplifier), an IF amplifier and the like. The satellite signal extracted by the bandpass filter is amplified by the LNA, mixed with the VCO signal by the mixer, and down-converted to IF (Intermediate Frequency). The IF mixed by the mixer passes through the IF amplifier and the IF filter, and is converted into a digital signal by the ADC.

The BB section calculates the correlation value between the local code generator that generates the local code consisting of the same C / A code used at the time of transmission by the GPS satellite, and the received signal output from the local code and the RF section. It is provided with a correlation unit. If the correlation value calculated by the correlation unit is equal to or higher than a predetermined threshold value, the C / A code used for the received satellite signal and the generated local code match, and the satellite signal is used. Can be captured (synchronized). Therefore, the navigation message can be demodulated by correlating the received satellite signal using a local code.

The information acquisition unit acquires GPS time information and position information based on the navigation message demodulated by the BB unit. The navigation message includes preamble data, TOW (Time of Week, also referred to as "Z count") of the HOW word, and each subframe data. The subframe data includes subframes 1 to 5, and each subframe includes, for example, satellite correction data including week number data and satellite health status data, and ephemeris (detailed orbit information for each GPS satellite). It also contains data such as Armanac (rough orbit information of all GPS satellites). Therefore, the information acquisition unit can acquire GPS time information and navigation information by extracting a predetermined data portion from the received navigation message.

The storage unit 124 stores programs, time zone information, and the like executed by the control unit 151. The time zone information is data that manages the position information (latitude / longitude) of the area (time zone) that uses common standard time and the time difference with respect to UTC.
By executing the program stored in the storage unit 124, various calculations, controls, and timekeeping are performed. This timekeeping is performed, for example, by counting the number of pulses of a reference signal from an oscillation circuit (not shown).

The control unit 151 includes time information calculated from GPS time information and time correction parameters, current location position information (latitude, longitude) calculated from GPS time information and orbit information, and a time zone stored in the storage unit 124. Correct the internal time based on the information. The control unit 151 controls the drive mechanism 140 and causes the pointers 21 to 23 to display the internal time.

[Solar cell configuration]
Next, the configuration of the solar cell 50 will be described in detail. FIG. 7 is a plan view of the solar cell 50, the dial receiving ring 126, and the antenna 110 as viewed from the front surface side. FIG. 8 is a cross-sectional view taken along the line P1-P1 of FIG.

As shown in FIG. 7, the solar cell 50 is formed in a disk shape, and is separated from the inner peripheral surface of the dial receiving ring 126 on the inner peripheral side of the dial receiving ring 126 formed in an annular shape. It is provided.
The dial receiving ring 126 is provided with a solar cell hook portion 126A for fixing the solar cell 50. The solar cell 50 is fixed to the dial receiving ring 126 by engaging the engaging portion of the guide plate (not shown) provided on the solar cell 50 with the solar cell hook portion 126A. It should be noted that the solar cell 50 may be directly supported by the dial receiving ring 126 without providing the guide plate. Further, in the present embodiment, in the solar cell 50, for example, since there is no notch at the position where it overlaps with the antenna 110 in a plan view, the solar cell 50 is held by the dial receiving ring 126 as compared with the case where the notch is present. easy.
The dial receiving ring 126 is provided with a main plate receiving portion 126B for receiving the main plate 125, a protruding portion 126C that abuts on the back cover 34, and the like. The main plate receiving portion 126B is provided at a position corresponding to the eaves (not shown) of the main plate 125, and the eaves are fitted. The protruding portion 126C protrudes from the bottom surface of the dial receiving ring 126 toward the back cover 34, and when the dial receiving ring 126 is stored in the outer case 30, it hits the back cover 34 to cause the dial receiving ring 126. Regulate the movement of the material in the thickness direction.

The solar cell 50 is provided with a pair of guide tabs 501 and 502 projecting outward from the outer peripheral edge. The guide tabs 501 and 502 are used as positioning portions for positioning the solar cell 50 with respect to the main plate 125.
Further, the solar cell 50 is provided with a protruding portion 503 protruding outward from the outer peripheral edge, and the protruding portion 503 is provided with connection terminals 504 and 505. Conductive springs as wiring members connected to the circuit board 120 are connected to the connection terminals 504 and 505.
Further, the solar cell 50 is provided with a through hole 509A through which the pointer shaft 25 is inserted, a through hole 509B through which the pointer shaft 26 is inserted, and an opening 509C corresponding to the calendar small window 19.

As shown in FIG. 8, the solar cell 50 includes a film substrate 511, a metal electrode 512, a semiconductor layer 513, a transparent electrode 514, and a protective layer 516 stacked in order from the back cover 34 toward the dial 11. ing.

The film substrate 511 is formed of, for example, a resin film such as polyethylene or polyimide. Here, the outer peripheral edge of the solar cell 50 seen from the dial 11 side coincides with the outer peripheral edge of the film substrate 511.

The metal electrode 512 is formed of a conductor containing a metal material such as aluminum or stainless steel. The metal electrode 512 is selectively formed at positions corresponding to the solar cells 51 to 58 described later, for example, by sputtering. The metal electrode 512 may be patterned and formed by laser processing.

The semiconductor layer 513 is formed so that a p-type semiconductor and an n-type semiconductor sandwich an i-type semiconductor. Pure silicon used as a material for semiconductors is an insulator, and when impurities are added, the resistivity decreases, resulting in p-type semiconductors and n-type semiconductors. For example, a p-type semiconductor is silicon plus an impurity boron (B). The n-type semiconductor is made by adding impurities phosphorus (P) and arsenic (As) to silicon. The i-type semiconductor is an intrinsic semiconductor in which impurities are not added to silicon. Further, each semiconductor has an irregular arrangement of atoms, that is, an amorphous state. By making it amorphous, it can absorb more light, so even a thin film can generate electricity. Further, each semiconductor is formed by adding hydrogen or the like in order to improve the power generation performance. Each such semiconductor is formed, for example, by using a plasma CVD method.

The transparent electrode 514 is made of a conductor containing zinc oxide, indium oxide, tin oxide and the like. A typical material is ITO (indium tin oxide). The transparent electrode 514 is selectively formed at positions corresponding to the solar cells 51 to 58, which will be described later, by, for example, sputtering. The transparent electrode 514 may be patterned and formed by laser processing.

Here, when the light transmitted through the transparent electrode 514 is incident on the semiconductor layer 513 which is the photoelectric conversion layer, electrons and holes are generated in the i-type semiconductor by the energy of the light. The generated electrons and holes move in the directions of the p-type semiconductor and the n-type semiconductor, respectively. As a result, a current flows through the external circuit connected to the transparent electrode 514 and the metal electrode 512. In this way, photovoltaic power generation is performed.
That is, the portion where the metal electrode 512, the semiconductor layer 513, and the transparent electrode 514 overlap each other constitutes a solar cell that generates photovoltaic power generation.

In this embodiment, as shown in FIG. 7, the solar cell 50 includes eight solar cells 51 to 58.
As shown in FIG. 6, the solar cells 51 to 58 are connected in series between the connection terminals 504 and 505. As shown in FIG. 7, the solar cells 51 to 58 are connected to each other by the connecting portion 506. The connection portion 506 connects the metal electrode 512 of one of the adjacent solar cells to the transparent electrode 514 of the other solar cell.
Since the electromotive voltage of one solar cell is 0.7 V or more, the solar cell 50 can obtain an electromotive voltage of 5.6 V (0.7 V × 8 cells) or more. Then, the electromotive voltage can be taken out by the connection terminals 504 and 505.
The number of solar cells may be determined so as to be the voltage required to charge the secondary battery 128. In this embodiment, since the secondary battery 128 uses a 3.7 V lithium ion battery, it can be charged if it has 6 cells or more, but it can be charged even if the electromotive voltage is low in low illuminance. It is composed of 8 cells with a margin.

Here, the distance at which the electromagnetic field incident on a certain material is attenuated to 1 / e is called the skin depth, and the smaller the skin depth, the more difficult it is for radio waves to pass through. The skin depth d of the conductor having a magnetic permeability μ and a conductivity σ with respect to a radio wave having a frequency f is given by the following equation (1). The relationship between the conductivity σ and the resistivity ρ is a reciprocal relationship.

According to the equation (1), the larger the frequency f of the radio wave, the smaller the skin depth d. That is, the larger the frequency f, the more difficult it is for radio waves to pass through. For high frequency microwaves, the effect on the depth of the epidermis is particularly large. That is, especially for a metal material or the like, the conductivity σ is high (the resistivity ρ is low), so that the skin depth is small. When the skin depth is small, the shielding effect against microwaves has a large effect.
The metal electrode 512 and the transparent electrode 514 included in the configuration of the solar cells 51 to 58 have high conductivity. For example, the conductivity of the metal electrodes 512 10 ⁶ S / cm (resistivity of ^{10 -6} [Omega] cm) is the conductivity of the transparent electrodes 514 10 ⁴ / cm (resistivity of ^{10 -4} [Omega] cm) is. Therefore, the metal electrode 512 and the transparent electrode 514 attenuate microwaves due to the shielding effect thereof.

Therefore, in the present embodiment, as shown in FIGS. 7 and 8, the solar cell 50 is a first non-power generation unit in which the metal electrode 512 and the transparent electrode 514 are not provided at positions overlapping with the antenna 110 in a plan view. A1 unit is provided, and the solar cells 51 to 58 are provided at positions other than the first non-power generation unit A1. The alternate long and short dash line B1 in FIG. 8 indicates the outer peripheral edge of the first non-power generation unit A1.
In the present embodiment, in order to suppress the shielding effect more reliably, the outer peripheral edge of the first non-power generation unit A1 is separated from the outer peripheral edge of the radiation electrode 112 of the antenna 110 by 1 mm or more in a plan view. Further, the first non-power generation unit A1 is continuously provided up to the outer peripheral edge of the solar cell 50.
That is, the first non-power generation unit A1 is a portion that transmits radio waves received by the antenna 110.

The solar cells 55 and 56 are provided adjacent to the first non-power generation unit A1 in a plan view, extend outward from the center of the plane of the solar cell 50, and bend along the outer peripheral edge of the antenna 110. It has a shape surrounded by a line extending radially from the center of the plane and a line along the outer peripheral edge of the solar cell 50.
The other solar cells 51 to 54, 57, 58 have a shape surrounded by two lines extending radially from the center of the plane and a line along the outer peripheral edge of the solar cell 50 in a plan view. ing. That is, the solar cells 51 to 54, 57, 58 have a substantially fan-shaped shape in a plan view.

Here, since the semiconductor layer 513 is made of silicon, it has a dark blue color, a bluish purple color, a dark gray color, or the like. Therefore, when the dial 11 is viewed from the surface side, the color of the semiconductor layer 513 can be seen through the dial 11 and the transparent electrode 514. Therefore, if there is a portion where the semiconductor layer 513 is not provided, the color of the portion looks different from the color of the portion where the semiconductor layer 513 is provided. Therefore, in the present embodiment, in order to reduce the color difference between the region where the solar cells 51 to 58 are located and the region where the first non-power generation unit A1 is located, as shown in FIG. 8, the first non-power generation unit A semiconductor layer 513 is also provided in the portion A1. That is, at that position, the film substrate 511 and the semiconductor layer 513 are laminated, and the metal electrode 512 and the transparent electrode 514 are not provided.

The semiconductor layer 513 has a low conductivity (high resistivity). For example, the thickest conductivity of i-type semiconductor 10 -2 ^{S /} cm or less in the semiconductor layer 513 (resistivity 10 ² [Omega] cm or more). Therefore, by setting the thickness dimension to, for example, 800 nm or less, sufficient radio wave transmission can be obtained. Therefore, the satellite signal propagated from the surface side of the clock passes through the non-conductive cover glass 33 and is not blocked by the electrodes of the solar cell 50, and the non-conductive dial 11 and the solar cell 50 It passes through the semiconductor layer 513, the non-conductive solar cell holder 131, the solar cell 130, and the main plate 125, and is incident on the antenna 110. Since the pointers 21 to 23 have a small area overlapping with the antenna 110, there is no problem in receiving satellite signals even if they are made of metal, but if they are non-conductive members, the effect of blocking satellite signals is greater. It is preferable in that it can be avoided.

Further, as shown in FIG. 7, in the present embodiment, in the solar cell 50, the second non-power generation portion is a cell division portion in which the metal electrode 512 and the transparent electrode 514 are not provided between the solar cells 51 to 58. A2 is provided. Here, the configuration of the second non-power generation unit A2 between the solar cells 53 and 54 will be described as a representative.
FIG. 9 is a cross-sectional view taken along the line P2-P2 of FIG. The alternate long and short dash line B2 in FIG. 9 shows the outer peripheral edge of the second non-power generation unit A2.
As shown in FIG. 9, in the present embodiment, the semiconductor layer 513 is also provided in the second non-power generation unit A2. That is, the second non-power generation unit A2 is provided with the film substrate 511 and the semiconductor layer 513, and is not provided with the metal electrode 512 and the transparent electrode 514.
The other second non-power generation unit A2 between the solar cells 51 to 58 is similarly configured.
As a result, it is possible to almost eliminate the color difference between the region where the second non-power generation unit A2 of the solar cell 50 is located, the region where the solar cells 51 to 58 are located, and the region where the first non-power generation unit A1 is located. .. Therefore, when the solar cell 50 is viewed from the surface side of the dial 11 through the dial 11, the difference in color can be almost eliminated.

Further, as shown in FIG. 7, in the present embodiment, the solar cells 51 to 58 are provided inside the outer peripheral edge of the solar cell 50, and are between the solar cells 51 to 58 and the outer peripheral edge of the solar cell 50. Is provided with a third non-power generation unit A3 to which the metal electrode 512 and the transparent electrode 514 are not provided. Here, the configuration of the third non-power generation unit A3 between the solar cell 56 and the outer peripheral edge of the solar cell 50 will be described as a representative.
FIG. 10 is a cross-sectional view taken along the line P3-P3 of FIG. The alternate long and short dash line B3 in FIG. 10 shows the outer peripheral edge of the third non-power generation unit A3.
As shown in FIG. 10, in the present embodiment, the semiconductor layer 513 is also provided in the third non-power generation unit A3. That is, the third non-power generation unit A3 is provided with the film substrate 511 and the semiconductor layer 513, and is not provided with the metal electrode 512 and the transparent electrode 514.
The third non-power generation unit A3 between the solar cells 51 to 55, 57, 58 and the outer peripheral edge of the solar cell 50 is also configured in the same manner.
As a result, the region where the third non-power generation unit A3 of the solar cell 50 is located, the region where the solar cells 51 to 58 are located, the region where the first non-power generation unit A1 is located, and the second non-power generation unit A2 are located. It is possible to almost eliminate the difference in color from the area to be used.

For the protective layer 516, a non-conductive resin having excellent strength is used to protect the semiconductor layer 513 and the transparent electrode 514. In the present embodiment, as shown in FIGS. 8 to 10, the protective layer 516 is provided on the surface side of the transparent electrode 514 and the semiconductor layer 513. The protective layer 516 is formed, for example, by coating.
Further, the protective layer 516 is preferably made of a colorless and transparent resin having a high light transmittance in order to increase the amount of light incident on the solar cell 50.
Examples of such a resin include polyethylene resin, acrylic resin, polyester resin and the like. The protective layer 516 may be formed of a plurality of layers by one kind or two or more kinds of materials.
Further, when light is reflected on the surface of the protective layer 516, the spectroscopy does not reach the semiconductor layer 513. Therefore, in order to suppress the reflection as much as possible, the surface of the protective layer 516 may be subjected to a non-reflection treatment.

Since the protective layer 516 is made of a non-conductive member, it transmits radio waves incident from the dial 11 side. Therefore, even if the protective layer 516 is provided on the surface side of the antenna 110, it does not affect reception.

[Action and effect of the first embodiment]
According to the present embodiment, the region where the first non-power generation unit A1 of the solar cell 50 is located, the region where the second non-power generation unit A2 is located, the region where the third non-power generation unit A3 is located, and the solar cell 51. It is possible to almost eliminate the color difference from the area where ~ 58 is located. Therefore, when the solar cell 50 is viewed from the surface side of the dial 11 through the dial 11, the difference in color can be almost eliminated, and the colors look the same as a whole, so that the appearance can be improved and the decorativeness is improved. , It becomes a high-class electronic clock. Further, the texture of the entire dial 11 when viewed from the surface side of the dial 11 is unified.

In the present embodiment, since the first non-power generation unit A1 is continuous to the outer peripheral edge of the solar cell 50 in a plan view, for example, a solar cell is provided on the outer peripheral side of the solar cell 50 with respect to the first non-power generation unit A1. Compared with the case, the antenna 110 can be arranged closer to the outer case 30, and the degree of freedom in the arrangement of the antenna 110 can be improved.
In the present embodiment, since the first non-power generation unit A1 overlapping the antenna 110 is integrally provided with the solar cell 50, the thickness of the electronic clock 1 can be reduced as compared with the case where a light-shielding sheet, which is a separate member, is used. Further, when a light-shielding sheet is used, the distance between the dial 11 and the solar cell 50 and the distance between the dial 11 and the light-shielding sheet are different, so that the color difference when viewed from the surface side of the dial 11 is different. However, in the present embodiment, since the distance from the dial 11 can be made the same, it is possible to almost eliminate the difference in color when the dial 11 is viewed from the surface side.
The same applies to the case where a notch is provided in the region where the second non-power generation unit A2 and the third non-power generation unit A3 are located and a light-shielding sheet is used in that region, and the same applies to the space between the dial 11 and the solar cell 50. Since the distance and the distance between the dial 11 and the light-shielding sheet are different, a difference in color occurs when viewed from the surface side of the dial 11, but in the present embodiment, the distance from the dial 11 can be the same. Therefore, it is possible to almost eliminate the difference in color when the dial 11 is viewed from the surface side.
Therefore, in this embodiment, it is not necessary to add parts other than the solar cell 50 such as a light-shielding sheet.

[Second Embodiment]
In the solar cell 50 of the first embodiment, the transparent electrode 514 is not provided in the portion overlapping the antenna 110 in a plan view, but in the solar cell 50A of the second embodiment, the portion overlapping the antenna 110 in a plan view is provided. A transparent antenna 514 is provided in a part thereof.
11 is a plan view of the solar cell 50A, and FIG. 12 is a cross-sectional view taken along the line P4-P4 of FIG.

In the antenna 110, since the current is concentrated on the outer peripheral edge of the radiation electrode 112, electric lines of force are generated from the outer peripheral edge. Therefore, in a plan view, even if the electrode is provided inside the outer peripheral edge of the radiation electrode 112 in the solar cell 50A, the influence of the electrode on the reception performance of the antenna 110 is small.
Further, the transparent electrode 514 absorbs a part of the light incident on the semiconductor layer 513 from the dial 11 side without transmitting all the light reflected on the dial 11 side by the semiconductor layer 513. As shown in the graph of FIG. 13, the light transmittance of the transparent electrode 514 is about 80% in the wavelength range of visible light (380 nm to 780 nm). That is, about 80% of the light incident on the transparent electrode 514 is transmitted, and the remaining light is absorbed. Therefore, the colors appear to be slightly different between the region where the transparent electrode 514 is provided and the region where the transparent electrode 514 is not provided.

Therefore, in the present embodiment, as shown in FIGS. 11 and 12, a semiconductor layer 513 and a transparent electrode 514 are provided at positions inside the outer peripheral edge of the radiation electrode 112 in the solar cell 50A in a plan view. The difference in color between the position and the position where the solar cells 51 to 58 are provided is reduced. An annular first non-power generation unit A1 is provided at a position surrounding the transparent electrode 514 in a plan view.
That is, a film substrate 511, a semiconductor layer 513, a transparent electrode 514, and a protective layer 516 are laminated on a portion of the solar cell 50A inside the outer peripheral edge of the radiation electrode 112 in a plan view.
In the present embodiment, in order to surely suppress the deterioration of the reception performance of the antenna 110 due to the transparent electrode 514, the transparent electrode 514 provided at the position overlapping with the antenna 110 is smaller in size than the radiation electrode 112 and is viewed in a plan view. The outer peripheral edge of the transparent electrode 514 is separated from the outer peripheral edge of the radiation electrode 112 by 1 mm or more.

[Action and effect of the second embodiment]
According to the present embodiment, the area of the first non-power generation unit A1 can be reduced as compared with the case where the first non-power generation unit A1 overlaps with the antenna 110 in a plan view. Since the transparent electrode 514 is not provided in the first non-power generation unit A1, the color is slightly different between the position where the first non-power generation unit A1 of the solar cell 50A is located and the position where the solar cells 51 to 58 are located. Looks different. According to the present embodiment, since the area of the first non-power generation unit A1 can be reduced, the difference in color can be further made inconspicuous. Therefore, when the solar cell 50A is viewed from the surface side of the dial 11 through the dial 11, the difference in color can be almost eliminated.

[Third Embodiment]
In the solar cell 50A of the second embodiment, the transparent electrode 514 is provided and the metal electrode 512 is not provided in a part of the portion overlapping the antenna 110 in a plan view, but the solar cell 50B of the third embodiment is provided. In addition to the transparent electrode 514, a metal electrode 512 is provided in a part of the portion overlapping the antenna 110 in a plan view.
FIG. 14 is a cross-sectional view of the solar cell 50B and the antenna 110.
In the present embodiment, as shown in FIG. 14, in a plan view, a metal electrode 512 having a size smaller than that of the radiation electrode 112 is provided inside the outer peripheral edge of the radiation electrode 112 in the solar cell 50B. That is, a film substrate 511, a metal electrode 512, a semiconductor layer 513, a transparent electrode 514, and a protective layer 516 are laminated on a portion of the solar cell 50B inside the outer peripheral edge of the radiation electrode 112 in a plan view.
In the present embodiment, in order to surely suppress the deterioration of the reception performance of the antenna 110 due to the metal electrode 512, the outer peripheral edge of the metal electrode 512 provided at a position overlapping the antenna 110 in a plan view is the radiation electrode 112. It is separated from the outer peripheral edge by 1 mm or more.
The metal electrode 512, the semiconductor layer 513, and the transparent electrode 514 laminated inside the outer peripheral edge of the radiation electrode 112 may be connected to the solar cells 51 to 58 to function as a solar cell for generating electricity.

[Action and effect of the third embodiment]
In the solar cell 50B, the light reflected by the metal electrode 512 is slightly transmitted through the semiconductor layer 513 and the transparent electrode 514 and emitted to the dial 11 side. Then, the colors look slightly different.
In the present embodiment, the metal electrode 512, the semiconductor layer 513, and the transparent electrode 514 are provided inside the outer peripheral edge of the radiation electrode 112 in the solar cell 50B in the same manner as the solar cells 51 to 58 in a plan view. The region inside the outer peripheral edge of the radiation electrode 112 and the region where the solar cells 51 to 58 are located can be the same color.

[Evaluation results]
Table 1 below shows the evaluation results of the signal level of the radio wave received by the antenna 110 in Comparative Examples 1 and 2 and the first to third embodiments. “Yes” and “No” in Table 1 indicate the presence / absence of the metal electrode 512, the semiconductor layer 513, and the transparent electrode 514 at positions overlapping with the antenna 110 in a plan view of the solar cell.

As shown in Table 1, in the first to third embodiments, there is no metal electrode 512, a semiconductor layer 513, and a transparent electrode 514 at a position overlapping the antenna 110 in a plan view of the solar cell (Comparative Example 1). ), And almost the same signal level can be obtained.

[Other embodiments]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like to the extent that the object of the present invention can be achieved are included in the present invention.

[Modification 1]
In each of the above embodiments, the semiconductor layer 513 is provided in the first non-power generation unit A1 and the third non-power generation unit A3, but the present invention is not limited thereto.
For example, if there is a portion of the first non-power generation unit A1 and the third non-power generation unit A3 that overlaps with the dial ring 35 or the like when the dial 11 is viewed from the surface side and is not visible, the semiconductor layer 513 is in the portion. It is not necessary to provide.

[Modification 2]
In each of the above-described embodiments, the semiconductor layer 513 is provided in the second non-power generation unit A2, which is the cell division unit, but the present invention is not limited to this.
Among the second non-power generation units A2, the second non-power generation unit A2 whose size along the facing direction of the adjacent solar cells is a predetermined size (for example, 200 μm) or less is the color of the region where the second non-power generation unit A2 is located. However, even if the color is different from the color of the area where the solar cells 51 to 58 are located, the difference in color is not noticeable. Here, in the second non-power generation unit A2, the dimension along the opposite direction is the distance of B2-B2 in FIG.
Therefore, as shown in FIG. 15, the semiconductor layer 513 may not be provided in the portion of the second non-power generation unit A2 whose dimension along the opposite direction is a predetermined dimension or less. That is, the configuration may include a film substrate 511 and a protective layer 516. In this case, the semiconductor layer 513 is removed by, for example, laser processing.
According to this configuration, since the semiconductor layer 513 is not provided in the second non-power generation unit A2, it is possible to suppress the occurrence of interference between the solar cells 51 to 58, and the interval between the solar cells 51 to 58 can be further narrowed. .. As a result, the area of each solar cell 51 to 58 can be increased, and the power generation capacity of the solar cell can be improved.
The film substrate 511 may be colored in order to make the difference in color between the second non-power generation unit A2 and the solar cells 51 to 58 more inconspicuous. It is more desirable to color it so that it has the same color as the semiconductor layer 513.

[Modification 3]
In each of the above embodiments, the solar cells 50, 50A, 50B include, but are not limited to, solar cells 55, 56 which are not fan-shaped in plan view.
For example, as shown in FIG. 16, the solar cell may be configured to include only 51 to 54, 57, 58 solar cells having a substantially fan shape in a plan view.
According to this configuration, it is possible to easily design each solar cell included in the solar cell in the same area. Further, when the metal electrode 512 and the transparent electrode 514 corresponding to each solar cell are patterned by laser processing, the length cut by the laser can be minimized, so that the manufacturing process can be shortened. Further, as compared with each embodiment, the distance between the solar cell adjacent to the antenna 110 and the antenna 110 can be increased in a plan view, so that the reception performance can be further improved.
In the third modification, the area of the entire solar cell is smaller than that of each embodiment, but the power generation capacity of the solar cell can be maintained by increasing the light transmittance of the dial 11.

[Modification 4]
If the size of the antenna 110 can be reduced, as shown in FIG. 17, the solar cells 51 to 58 have a substantially fan-shaped shape in a plan view and are arranged at a predetermined distance from the outer peripheral edge of the solar cell. Let me. Then, in a plan view, the antenna 110 may be arranged between the outer peripheral edge of the solar cells 51 to 58 and the outer peripheral edge of the solar cell. Further, the solar cells 51 to 58 may be separated from the plane center of the solar cell in a plan view, and the antenna 110 may be arranged between the plane center and the solar cells 51 to 58.

[Modification 5]
Further, as shown in FIG. 18, instead of the solar cells 55 and 56, in plan view, two lines surrounding the outer peripheral edge of the antenna 110 and extending radially from the center of the plane of the solar cell, and the sun. One solar cell 59 having a shape surrounded by a line along the outer peripheral edge of the battery may be provided. In this case, in plan view, the first non-power generation unit A1 is surrounded by the solar cell 59.
According to this configuration, in a plan view, the region on the outer peripheral side of the antenna 110 in the solar cell can function as a solar cell, so that the area of the solar cell can be increased and the power generation capacity of the solar cell can be improved.

[Modification 6]
In each of the above embodiments, the solar cells 50, 50A, and 50B overlap with the antenna 110 in a plan view, but the present invention is not limited to this. For example, as shown in FIG. 19, a part of the antenna 110 may be located outside the solar cells 50, 50A, 50B in a plan view.

[Modification 7]
In addition to the antenna 110 that receives satellite signals, the electronic clock 1 includes Bluetooth (registered trademark), BLE (Bluetooth Low Energy), Wi-Fi (registered trademark), NFC (Near Field Communication), and LPWA (Low Power, Wide). An antenna 210 that receives other radio waves such as Area) and standard radio waves may be provided. In this case, for example, as shown in FIG. 20, in the solar cell, the solar cell is not provided at the position where it overlaps with the antenna 210 in a plan view, and the position is also the first non-power generation unit A1.

[Modification 8]
In each of the above embodiments, the radiation electrode 112 of the antenna 110 is formed in a substantially square shape in a plan view, but the radiation electrode 112 is not limited thereto. For example, as shown in FIG. 21, the radiation electrode 112 may be formed in a substantially circular shape in a plan view. According to this, it becomes easier to receive circularly polarized waves.

[Modification 9]
In each of the above-described embodiments, the electronic clock is provided with the pointer 24 at a position deviated from the center of the plane of the dial 11 in the 6 o'clock direction. An opening 11A may be provided in the plate 11, and a digital display unit such as a liquid crystal display, an EPD (Electrophoretic Display), or an organic EL (Electro Luminescence) display may be visually recognized from the opening 11A. Such a digital display unit displays, for example, a day of the week, weather, and the like.
In this case, as shown in FIG. 23, the solar cell is provided with an opening 509D at a position overlapping the digital display unit in a plan view.

[Modification 10]
In each of the above embodiments, the solar cells 50, 50A, and 50B are provided with the third non-power generation unit A3, but the present invention is not limited to this. For example, the third non-power generation unit A3 may not be present. That is, the solar cells 51 to 58 may be continuous to the outer peripheral edge of the solar cell.

[Modification 11]
In each of the above embodiments, the antenna 110 is provided with a patch antenna for receiving satellite signals, but the antenna 110 is not limited to this. For example, it may be an inverted F antenna or a chip antenna. Further, the antenna 110 may be an antenna that receives other radio waves such as Bluetooth (registered trademark), BLE, Wi-Fi (registered trademark), NFC, LPWA, and standard radio waves. In this case, for example, the semiconductor layer 513 may be set to a thickness dimension or resistivity that does not interfere with radio waves.
However, since the patch antenna has a larger size than, for example, a bar antenna, in the solar cells 50, 50A, and 50B, if an electrode is provided, the receiving performance of the antenna 110 deteriorates over a wide range. That is, it is necessary to provide the first non-power generation unit A1 in a wide range. Therefore, the appearance can be effectively improved by reducing the color difference between the region where the first non-power generation unit A1 is located and the region where the solar cells 51 to 58 are located.
Further, in the first embodiment, since the first non-power generation unit A1 overlaps with the antenna 110 in a plan view, the radio waves incident from the dial 11 side of the antenna 110 are the electrodes of the solar cells 51 to 58. Not blocked. Therefore, the reception performance of the antenna 110 can be improved regardless of the type of the antenna 110 such as a patch antenna or a bar antenna.

1 ... electronic clock, 11 ... dial, 30 ... exterior case, 31 ... case (metal case), 32 ... bezel, 50, 50A, 50B ... solar cell, 51-58 ... solar cell, 110 ... antenna, 111 ... dielectric Body base material, 112 ... Radiation electrode, 511 ... Film substrate, 512 ... Metal electrode, 513 ... Semiconductor layer, 514 ... Transparent electrode, 516 ... Protective layer, A1 ... First non-power generation unit, A2 ... Second non-power generation unit, A3 ... Third non-power generation unit.

Claims (8)

A dial with light transmission and
The solar cell provided on the back side of the dial and
An antenna for receiving radio waves provided on the back surface side of the solar cell is provided.
The solar cell includes a plurality of solar cells that generate power, a first non-power generation unit that transmits radio waves received by the antenna, and a second non-power generation unit that is a cell division unit provided between the solar cells. Equipped with
The solar cell includes a metal electrode, a semiconductor layer laminated on the dial side of the metal electrode, and a transparent electrode laminated on the dial side of the semiconductor layer.
The metal electrode and the transparent electrode are not provided in the first non-power generation unit and the second non-power generation unit, respectively, and the semiconductor layer is provided at least in a part thereof.
The antenna is a patch antenna provided with a radiation electrode.
In a plan view seen from the dial side, the solar cell is provided with the semiconductor layer and the transparent electrode having a size smaller than that of the radiation electrode inside the outer peripheral edge of the radiation electrode.
The first non-power generation unit is an electronic clock characterized in that it is provided so as to surround the transparent electrode in the plan view. In the electronic clock according to claim 1,
In the plan view, the solar cell is characterized in that the metal electrode having a size smaller than that of the radiation electrode is provided inside the outer peripheral edge of the radiation electrode. In the electronic clock according to claim 1 or 2.
In the solar cell, the solar cell is provided inside the outer peripheral edge.
The solar cell includes a third non-power generation unit between the solar cell and the outer peripheral edge.
An electronic timepiece characterized in that the metal electrode and the transparent electrode are not provided in the third non-power generation unit, and the semiconductor layer is provided at least in a part thereof. In the electronic clock according to any one of claims 1 to 3.
The first non-power generation unit is continuous to the outer peripheral edge of the solar cell in a plan view seen from the dial side.
An electronic clock characterized in that the first non-power generation unit overlaps with the antenna in the plan view. In the electronic clock according to any one of claims 1 to 3.
An electronic timepiece characterized in that the outer peripheral edge of the antenna is surrounded by the solar cell in a plan view seen from the dial side. In the electronic clock according to any one of claims 1 to 3.
In a plan view seen from the dial side, each of the solar cells is surrounded by two lines extending radially from the center of the plane of the solar cell and a line along the outer peripheral edge of the solar cell. Has a shape and
An electronic timepiece characterized in that the antenna is located at a position that does not overlap with the solar cell in the plan view. In the electronic clock according to any one of claims 1 to 6.
An electronic watch characterized by having a metal case. In the electronic clock according to any one of claims 1 to 7.
An electronic watch characterized by having a non-conductive bezel.

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