JP6428823B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device.

2. Description of the Related Art Conventionally, electronic devices that receive various types of radio waves and perform operations based on information superimposed on the radio waves are known. As an electronic device of this type, for example, a watch using a GPS (Global Positioning System) (hereinafter referred to as “GPS watch”) is a radio wave (hereinafter referred to as “GPS satellite”) that is transmitted from an artificial satellite (GPS satellite) orbiting over the earth. It is possible to correct the time to an accurate time anywhere in the world by receiving the GPS radio wave ”) and acquiring the accurate time information superimposed on the GPS radio wave.
GPS radio waves are right-handed circularly polarized microwaves, and a patch antenna is small as a receiving antenna, and reception performance is high.

In addition, electronic devices including solar panels that receive light and generate electricity are widely known. Such an electronic device can be used for a long time without replacing the battery by generating power with a solar panel and storing it in a secondary battery.
For example, if a GPS watch is equipped with a solar panel, time adjustment and battery replacement are unnecessary, and a user-friendly and convenient watch can be realized.

  However, the solar panel is provided with electrodes and the like formed of a conductive material such as an aluminum conductor. For this reason, when a solar panel is disposed above the antenna, the antenna characteristics (antenna reception performance) are significantly deteriorated due to the influence of the conductive material.

  Therefore, for example, in the technique described in Patent Document 1, the deterioration of the antenna characteristics is suppressed by disconnecting the electrical connection between the solar panel and the secondary battery when the antenna receives radio waves by switching control using a switching element. Yes.

JP 2010-66151 A

However, the technique described in Patent Document 1 requires a dedicated switching element in the control circuit and requires complicated switching control corresponding to the reception state of radio waves, which complicates the configuration.
Furthermore, since the power generated by the solar panel cannot be stored in the secondary battery during reception of radio waves, the amount of charge (charge amount) of the secondary battery is reduced accordingly.

  The present invention has been made in view of the circumstances as described above, and an object thereof is to provide an electronic device capable of suitably receiving radio waves of a predetermined frequency and storing electricity in a secondary battery with a simple configuration. Is.

In order to solve the above-described problems, an electronic device according to the present invention includes:
And line Upa panel the power generation,
And a secondary battery for storing electric power generated in the previous Kipa panel,
A circuit board electrically connected to the secondary battery;
Is arranged near the front Kipa panel, an antenna for receiving a radio wave having a predetermined frequency,
A circuit element and the electric resistance is different for an electric wave which the electrical resistance antenna receives for power generation current from the panel,
With
The circuit board has a front first electrode and the second electrode Kipa panel are electrically connected, said circuit elements, and the first electrode side and the second electrode side and wherein each provided et the possible on the wiring path.

  According to the present invention, it is possible to suitably perform reception of radio waves of a predetermined frequency and storage of electricity in a secondary battery with a simple configuration.

It is a disassembled perspective view of the timepiece in the embodiment. It is a side view which shows the schematic internal structure of the module in embodiment. It is a block diagram which shows the general | schematic control structure of the timepiece in embodiment. It is a block diagram which shows the modification of the rough control structure of the timepiece in embodiment. It is a top view of the solar panel in an embodiment. It is sectional drawing of the solar panel which follows the VI-VI line in FIG. It is a top view which shows the modification of the solar panel in embodiment. It is sectional drawing of the modification of the solar panel which follows the VIII-VIII line in FIG. It is a top view which shows the other modification of the solar panel in embodiment.

An embodiment of an electronic device according to the present invention will be described with reference to FIGS.
The embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

In the present embodiment, a case will be described in which the electronic device is an analog timepiece (electronic timepiece) that displays the time and the like by moving the hands.
FIG. 1 is an exploded perspective view of a timepiece 100 according to the present embodiment.
As shown in FIG. 1, the timepiece 100 of this embodiment includes a dial 1, a module 3 including a circularly polarized antenna 4, and a solar panel 5.
The dial 1, the module 3, the circularly polarized antenna 4 and the solar panel 5 are housed in a case (not shown).

In the present embodiment, the dial plate 1 is an analog dial plate that is arranged on the viewing side of the timepiece 100 and displays the time by the hands 2 such as the hour hand and the minute hand.
A through-hole 11 through which a pointer shaft 31 to which the pointer 2 is attached is inserted is formed at a substantially central portion of the dial 1.
The timepiece 100 of this embodiment includes a circularly polarized antenna 4 that receives GPS radio waves, which are microwaves, as will be described later. For this reason, the dial 1 is preferably formed of a non-metallic material that transmits microwaves, and is formed of, for example, resin or glass.
The timepiece 100 also includes a solar panel 5 that receives light and generates power. For this reason, the dial 1 is formed of a transparent or translucent light-transmitting material.
Note that the dial 1 is formed by depositing a metal film having a thickness that does not attenuate the microwave and does not hinder the transmission of light on the surface of a substrate formed of, for example, a transparent or translucent resin or glass. It may have been subjected to various printing.

  The module 3 is disposed below the dial 1 and the solar panel 5 (that is, on the back surface side of the timepiece 100). For example, a timepiece movement including a wheel train mechanism and a motor for moving the hands 2, a circularly polarized wave In addition to a communication module (not shown) connected to the antenna 4, various electronic components such as a secondary battery 6 that stores power generated by the solar panel 5 and a control circuit for displaying time by the hands 2 Is mounted in a housing (not shown) formed of resin or the like.

In the present embodiment, a pointer shaft 31 that protrudes upward from the movement side is provided at a substantially central portion of the module 3.
The pointer shaft 31 has a plurality of rotating shafts for hour hand, minute hand, second hand, and the like arranged on the same shaft. The through hole 51 of the solar panel 5 and the through hole 11 of the dial 1 described later. , And a corresponding pointer 2 (for example, hour hand, minute hand, second hand) is connected to each rotating shaft.
When the pointer shaft 31 is rotated by the movement of the movement, the various pointers 2 attached to the rotary shafts of the pointer shaft 31 are individually rotated on the upper surface of the dial 1 around the axis of the pointer shaft 31. .

In addition, a circularly polarized antenna 4 is arranged at one end along the outer periphery of the module 3.
The position where the circularly polarized antenna 4 is disposed is preferably in a range of a region where the center of the circularly polarized antenna 4 extends from 4 o'clock to 6 o'clock through 7 o'clock on the dial 1 in plan view.

The circularly polarized antenna 4 is capable of receiving GPS radio waves (that is, radio waves including time information transmitted from GPS satellites) that are circularly polarized microwaves. For example, a patch antenna is preferably used.
GPS radio waves include time information from high-precision atomic clocks mounted on each GPS satellite, an ephemeris (ie, orbit information) with approximate accuracy of all satellites updated about every 6 days, and about every 90 minutes. Data including the ephemeris of the satellite itself to be updated is included, and each GPS satellite transmits these information by radio waves (microwaves) having a frequency of L1 (1575.42 MHz) or L2 (1222.70 MHz). Sending to the ground.
The timepiece 100 receives GPS radio waves from at least one of a plurality of GPS satellites by the circularly polarized antenna 4, and uses the time information included therein to accurately set the time in the timepiece 100. Can be corrected.
The GPS radio wave also includes orbit information indicating the position of each GPS satellite in the orbit as described above. Therefore, the watch 100 can receive GPS radio waves transmitted from a plurality of GPS satellites by the circularly polarized antenna 4 and perform positioning calculation using time information and orbit information included therein. is there.

As shown in FIG. 1, the circularly polarized antenna 4 of the present embodiment includes a base 41 and a radiation electrode 42 (radiation element) disposed on the base 41 and formed in a rectangular shape in plan view. Yes. The shape of the circularly polarized antenna 4 is not limited to the illustrated example.
The base 41 is made of a dielectric material such as ceramic.
The radiation electrode 42 is made of, for example, a silver foil, a metal plate, or a metal film having a predetermined thickness.
The size of the radiation electrode 42 (the length of each side, etc.) is optimized based on the frequency of the radio wave to be received by the circularly polarized antenna 4. In this embodiment, the frequency band of the GPS radio wave is used. Is adjusted to show the highest antenna characteristics.
A feeding point 43 for feeding power to the radiation electrode 42 is provided at a position having circular polarization characteristics in the circularly polarized antenna 4, that is, a position where impedance matching can be achieved.
The method for supplying power to the radiation electrode 42 is not particularly limited.
In addition, a through-hole (not shown) through which a feed member (not shown) that feeds the radiation electrode 42 (for example, a feed pin or a coaxial cable) is inserted at a position corresponding to the feed point 43 is penetrated in the thickness direction of the circularly polarized antenna 4. May be formed.

  The circularly polarized antenna 4 of the present embodiment is disposed in the module 3 at a position avoiding the pointer shaft 31 (see FIG. 5). Note that the position where the circularly polarized antenna 4 is provided and the direction in which the circularly polarized antenna 4 is arranged are not limited to the illustrated example.

In the circularly polarized antenna 4, the radiation pattern spreads from the peripheral edge (end) of the radiation electrode 42.
In the present embodiment, the radiation electrode 42 is formed in a substantially square shape, and the radiation pattern spreading from each side (peripheral portion) greatly affects the antenna characteristics (the radio wave reception performance of the antenna) of the circularly polarized antenna 4.
For this reason, in order to improve the antenna characteristics of the circularly polarized antenna 4, it is important not to inhibit the spread of the radiation pattern from the peripheral edge of the radiation electrode 42.

FIG. 2 is a side view showing a schematic internal configuration of the module 3.
As shown in this figure, the above-described secondary battery 6 and circuit board 7 are accommodated in the module 3.
The secondary battery 6 is disposed below the circuit board 7 and is electrically connected to the circuit board 7.
The circuit board 7 electrically connects the secondary battery 6 and the solar panel 5, and is electrically connected to the solar panel 5 thereabove. Specifically, the + electrode 71p on the circuit board 7 is electrically connected to the solar panel 5 (a solar cell 50a described later) via a connector (connecting member) 81p, and the − electrode 71n is connected to the connector (connecting member). It is electrically connected to the solar panel 5 (a solar cell 50f described later) through a connection member 81n.

FIG. 3 is a block diagram showing a schematic control configuration of the timepiece 100, and is mainly for explaining a power storage (charging) function of the timepiece 100.
As shown in this figure, on the circuit board 7, a CPU (Central Processing Unit) 72 that integrally controls each part of the timepiece 100, and a charge control circuit 73 that controls the charging operation from the solar panel 5 to the secondary battery 6. And have been implemented.
The CPU 72 is electrically connected to the charge control circuit 73 and controls the operation of the charge control circuit 73. Although not shown, the CPU 72 is also electrically connected to a communication module, a clock movement, and the like connected to the circularly polarized antenna 4, and corrects the time based on time information in GPS radio waves. It is like that.
The charging control circuit 73 is electrically connected in series with each of the solar panel 5 (a plurality of solar cells 50 described later) and the secondary battery 6, and from the solar panel 5 to the secondary battery based on a control command from the CPU 72. 6 is controlled.

In addition, an inductor 74 is electrically connected in series on the wiring path (in this embodiment, on the + electrode 71p side) of the circuit board 7 between the solar panel 5 and the charging control circuit 73 (secondary battery 6). ing.
The inductor 74 is a choke coil for reducing the influence (noise) that the generated current from the solar panel 5 has on the reception of GPS radio waves in the circularly polarized antenna 4. In this embodiment, the inductor 74 has an inductance value of about 1 mH. Have. More specifically, the inductor 74 behaves low as an electric resistance (DC resistance in the present embodiment) with respect to the generated current from the solar panel 5 and has an impedance (electric resistance) with respect to radio waves of a predetermined frequency received by the circularly polarized antenna 4. ) Is a circuit element that enhances.

  The position where the inductor 74 is provided is not particularly limited as long as it is on the wiring path between the solar panel 5 and the secondary battery 6, but is preferably a position close to the solar panel 5. In terms of suppressing current superposition, it is more preferable that the path length (conductor length) is a midway position on the wiring path having a longer length. Therefore, the inductor 74 may be provided on the wiring path on the negative electrode 71n side instead of the positive electrode 71p side, but as shown in FIG. 4, two wirings on the positive electrode 71p side and the negative electrode 71n side are provided. More preferably, each is provided on the path.

As shown in FIG. 1, the solar panel 5 receives light and generates electric power, and the electric power generated by the solar panel 5 is stored in the secondary battery 6.
The solar panel 5 of the present embodiment is disposed between the dial 1 and the module 3 and has an area corresponding to the area in the surface direction of the dial 1.
The dial plate 1 of the present embodiment is formed of a light transmissive material as described above, and the solar panel 5 receives light by making the area of the solar panel 5 correspond to the area of the dial plate 1 in the surface direction. The area can be secured as wide as possible.
In addition, the shape etc. of the solar panel 5 are not specifically limited. The solar panel 5 has an area substantially corresponding to the area in the surface direction of the dial 1 and may be any one that substantially overlaps the dial 1, and the area and shape thereof coincide with the area and shape of the dial 1. It does not have to be.

FIG. 5 is a plan view of the solar panel 5 in the present embodiment, and FIG. 6 is a cross-sectional view of the solar panel 5 taken along line VI-VI in FIG.
As shown in FIGS. 1 and 5, a through-hole 51 through which the pointer shaft 31 is inserted is provided in a substantially central portion of the solar panel 5.
In the present embodiment, the solar panel 5 has a position corresponding to the radiation electrode 42 of the circularly polarized antenna 4 in addition to the plurality of solar cells 50 (in this embodiment, six solar cells 50a to 50f) that are light receiving units. The non-power generation unit 57 is disposed in the.

Here, the “position corresponding to the radiation electrode 42” is a position above the radiation electrode 42.
As described above, since the radiation pattern of the circularly polarized antenna 4 spreads from the peripheral edge of the radiation electrode 42, when the peripheral edge of the radiation electrode 42 is covered with a member that inhibits transmission of radio waves, the circularly polarized antenna 4 4 antenna characteristics (radio wave reception performance) deteriorate.
In order to prevent this, in the present embodiment, the portion of the solar panel 5 located above the radiation electrode 42 is made of only a non-conductive material without containing a conductive material and does not receive or generate power. A non-power generation unit 57 is provided.
Note that the size of the non-power generation unit 57 is preferably slightly larger than that of the radiation electrode 42. In this embodiment, the non-power generation unit 57 is formed to be approximately 2 mm wider than the radiation electrode 42 over the entire circumference.

  As shown in FIG. 6, in the solar panel 5, a metal electrode 54, a semiconductor layer 55, and a transparent electrode 56 constituting each solar cell 50 are laminated in this order on a resin substrate 53, and a protective layer ( The protective film 58 is laminated. In addition, an insulating layer 59 is disposed on the side surface of the laminated structure including the metal electrode 54, the semiconductor layer 55, and the transparent electrode 56 constituting each solar cell 50.

The resin substrate 53 is a flexible film-like substrate. Although the material which forms the resin substrate 53 is not specifically limited, For example, it forms with a plastics etc.
The metal electrode 54 is formed including a metal material such as an aluminum conductor, for example. The material for forming the metal electrode 54 is not limited to this.
The semiconductor layer 55 is made of, for example, amorphous silicon (a-Si: H). As the semiconductor layer 55, for example, a pn junction type semiconductor in which a p-type semiconductor and an n-type semiconductor are joined is used.
The metal electrode 54 and the semiconductor layer 55 are laminated and formed on the resin substrate 53 by a technique such as vapor deposition, for example. The method of providing the metal electrode 54 and the semiconductor layer 55 on the resin substrate 53 is not limited to this.
The transparent electrode 56 is formed by crystallizing zinc oxide, indium oxide, tin oxide or the like on a substrate such as glass. In addition, the material and formation method which form the transparent electrode 56 are not limited to this.

The non-power generation unit 57 of the solar panel 5 is formed by removing the metal electrode 54, the semiconductor layer 55, and the transparent electrode 56 that are located above the radiation electrode 42.
The method for removing the metal electrode 54, the semiconductor layer 55, and the transparent electrode 56 is not particularly limited, and for example, a laser processing or the like is used. Further, the metal electrode 54, the semiconductor layer 55, and the transparent electrode 56 are not removed, but the metal electrode 54, avoiding the portion where the non-power generation portion 57 is provided (that is, the portion located above the radiation electrode 42). The semiconductor layer 55 and the transparent electrode 56 may be stacked.

In the present embodiment, as shown in FIGS. 1 and 5, the six solar cells 50a to 50f are formed in substantially equal areas so that their output currents are substantially equal.
The solar cells 50a to 50f are connected in series and function as one solar panel.
Specifically, the solar cell 50a is electrically connected to the adjacent solar cell 50b at the connection portion 52a, and the solar cell 50b is electrically connected to the adjacent solar cell 50c at the connection portion 52b. Similarly, the solar cells 50c to 50e are electrically connected to the adjacent solar cells 50d to 50f at the connection portions 52c to 52e.
The solar cell 50a is electrically connected to the + electrode 71p on the circuit board 7 via the connector 81p, and the solar cell 50f is electrically connected to the − electrode 71n on the circuit board 7 via the connector 81n. (See FIG. 2).
Thereby, six solar cells 50a-50f are electrically connected with the circuit board 7 in the state connected in series.

In addition, the connection positions for electrically connecting the solar panel 5 and the circuit board 7, that is, the positions of the two electrodes 71p and 71n and the two connectors 81p and 81n of the circuit board 7, are determined by the six solar cells 50a to 50f. The position is not particularly limited as long as the position is electrically connected to the circuit board 7 while being connected in series. For example, the position may be on the solar cell 50c or the solar cell 50d.
However, this connection position is preferably a position away from the circularly polarized antenna 4 as in this embodiment. Specifically, the connection position is a line passing through the center of the solar panel 5 while being orthogonal to a line connecting the center of the circularly polarized antenna 4 and the center of the solar panel 5 in the solar panel 5 in plan view. As a boundary line, it is provided in a region opposite to the region where the circularly polarized antenna 4 is provided (the lower half region in FIG. 5) via the boundary line (the upper half region in FIG. 5). It is preferable. As described above, when the position of the circularly polarized antenna 4 is within the range of the area from 4 o'clock to 6 o'clock through 7 o'clock on the dial 1 in the plan view, the connection position is It is more preferable that it is within the range of the region from 8 o'clock to 12 o'clock in the plate 1 (see FIG. 1). Of course, the circularly polarized antenna 4 is provided at a position avoiding the center of the solar panel 5.
Thus, by separating the connection position between the solar panel 5 and the circuit board 7 from the circularly polarized antenna 4, the conductive material (two electrodes 71 p and 71 n and two connectors 81 p and 81 n provided at this connection position). Etc.) is arranged at a position away from the circularly polarized antenna 4. For this reason, the impedance of the solar panel 5 in the vicinity of the upper position of the circularly polarized antenna 4 is higher than the impedance of the solar panel 5 in the vicinity of the connection position away from the circularly polarized antenna 4. The adverse effect (electromagnetic shielding effect) of the materials (the metal electrode 54 of the solar cell 50, the semiconductor layer 55, the transparent electrode 56, etc.) on the reception of GPS radio waves in the circularly polarized antenna 4 can be reduced.

In the present embodiment, a date wheel (not shown) is arranged in the module 3, and the dial 1 is provided with a date display window 12 for displaying the date.
The solar panel 5 has a date display opening 511 at a position corresponding to the date display window 12 of the dial 1.
In the present embodiment, the date display opening 511 is provided in the non-power generation unit 57 of the solar panel 5 that does not receive or generate power.
Accordingly, the date display opening 511 can be provided while suppressing the influence on the power generation amount in the solar panel 5, that is, without substantially reducing the total area of the plurality of solar cells 50.

Next, the operation of the timepiece 100 in this embodiment will be described.
In the timepiece 100 of the present embodiment, when the light transmitted through the dial 1 from the viewing side enters the solar panel 5 having the solar cells 50 a to 50 f, the light passes through the transparent electrode 56 and enters the semiconductor layer 55. When light enters the semiconductor layer 55, electrons and holes are generated near the junction between the p-type semiconductor and the n-type semiconductor. The generated electrons and holes move toward the n-type semiconductor and the p-type semiconductor, respectively, and an electromotive force (photoelectromotive force) is generated. As a result, a current flows through a circuit connected to the transparent electrode 56 and the metal electrode 54. Thus, the electric power generated by the solar panel 5 is stored in the secondary battery 6 via the circuit board 7.
At this time, the inductor 74 provided on the wiring path from the solar panel 5 to the secondary battery 6 on the circuit board 7 has an electric resistance with respect to the generated current (DC current) from the solar panel 5 of approximately 0Ω. The generated current is not hindered. Thereby, the electric power generated by the solar panel 5 is preferably stored in the secondary battery 6.

  In the timepiece 100, GPS radio waves transmitted through the dial 1 enter the circularly polarized antenna 4. Then, the CPU 72 on the circuit board 7 corrects the time in the timepiece 100 to an accurate time based on time information included in the GPS radio wave received by the circularly polarized antenna 4.

At this time, the impedance at the frequency of the GPS radio wave of the charging circuit connecting the solar panel 5 and the secondary battery 6 by the inductor 74 provided on the wiring path from the solar panel 5 to the secondary battery 6 on the circuit board 7. Becomes extremely high.
More specifically, the circuit impedance Z is ideally expressed as Z = 2πfL. Here, f is the frequency of the signal, and L is the inductance value of the circuit. Since the frequency of the GPS radio wave is about 1.5 GHz as described above and the inductance value of the inductor 74 is about 1 mH as described above, the impedance Z of the charging circuit at the frequency of the GPS radio wave is about 10 kΩ according to the above equation. Become.
As described above, since the impedance of the charging circuit at the frequency of the GPS radio wave becomes high, almost no current flows through the charging circuit at the frequency. Therefore, in the GPS radio frequency band, the electrical connection state between the solar panel 5 and the circuit board 7 can be made almost open, so that the conductive material of the solar panel 5 (the metal electrode 54 of the solar cell 50). , The semiconductor layer 55, the transparent electrode 56, etc.) can reduce the adverse effect (electromagnetic shielding effect) on the reception of GPS radio waves in the circularly polarized antenna 4.

  At this time, the peripheral portion of the radiation electrode 42 in the circularly polarized antenna 4 is not covered with a conductive material (such as the metal electrode 54, the semiconductor layer 55, and the transparent electrode 56 of the solar cell 50). Therefore, the spread of the radiation pattern is not inhibited, and the circularly polarized antenna 4 can receive GPS radio waves satisfactorily.

As described above, according to the present embodiment, on the wiring path that electrically connects the solar panel 5 and the secondary battery 6 in the circuit board 7, the direct current resistance against the generated current from the solar panel 5 is An inductor 74 is provided that increases the impedance to radio waves received by the circularly polarized antenna 4 while decreasing.
For this reason, the impedance of the charging circuit at the frequency of the GPS radio wave is increased without hindering the power generation current from the solar panel 5 to the secondary battery 6, and the conductive material of the solar panel 5 becomes the GPS in the circularly polarized antenna 4. The adverse effect on reception of radio waves can be reduced. Therefore, even when the solar panel 5 is arranged above the circularly polarized antenna 4, it has a simple configuration in which the inductor 74 is provided on the wiring path that connects the solar panel 5 and the secondary battery 6. GPS radio wave reception by the circularly polarized antenna 4 and power storage by the secondary battery 6 can be suitably performed.

  Further, by providing the inductors 74 on the two wiring paths on the + electrode 71p side and the −electrode 71n side of the circuit board 7, the conductive material of the solar panel 5 can receive GPS radio waves in the circularly polarized antenna 4. The adverse effect exerted can be further reduced.

In the present embodiment, the connection position where the solar panel 5 and the circuit board 7 are electrically connected is a position away from the circularly polarized antenna 4. That is, in the plan view, this connection position is a boundary line that passes through the center of the solar panel 5 while orthogonal to the line connecting the center of the circularly polarized antenna 4 and the center of the solar panel 5 in the solar panel 5. The circularly polarized antenna 4 is provided in a region opposite to the region where the circularly polarized antenna 4 is provided.
For this reason, the conductive material (two electrodes 71p, 71n, two connectors 81p, 81n, etc.) provided at the connection position is disposed at a position away from the circularly polarized antenna 4 and is positioned above the circularly polarized antenna 4. The impedance of the solar panel 5 in the vicinity is higher than the impedance of the solar panel 5 in the vicinity of the connection position away from the circularly polarized antenna 4. Therefore, the adverse effect of the conductive material of the solar panel 5 on the reception of GPS radio waves in the circularly polarized antenna 4 can be further reduced.

Further, in the present embodiment, the circularly polarized antenna 4 is disposed below the solar panel 5, and the solar panel 5 is made of a nonconductive material at a position corresponding to the radiation electrode 42 of the circularly polarized antenna 4. A non-power generation unit 57 is provided.
For this reason, the peripheral part of the radiation electrode 42 is not covered with a conductive material. Therefore, deterioration of the antenna characteristics of the circularly polarized antenna 4 can be suppressed and GPS radio waves can be received well.

  Needless to say, embodiments to which the present invention is applicable are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, in the embodiment described above, the inductor 74, which is a choke coil having an inductance value of about 1 mH, is provided as a circuit element that increases the impedance to a radio wave of a predetermined frequency received by the circularly polarized antenna 4. Is not limited to this, and may be a choke coil having an inductance value other than the above, or may be another EMC countermeasure component such as a filter.

  Moreover, in the said embodiment, the non-electric power generation part 57 provided in the position corresponding to the radiation electrode 42 among the solar panels 5 removes an electroconductive material (the metal electrode 54 and the transparent electrode 56), etc., and is nonelectroconductive. Although it is made of a material, the position corresponding to the radiation electrode 42 may be an opening (a portion without the resin substrate 53 and the protective layer 58) without providing such a non-power generation portion 57.

Further, the non-power generation unit 57 of the solar panel 5 may be one in which only the metal electrode 54 is removed as shown in FIGS. 7 and 8.
Here, FIG. 7 is a plan view showing a modification of the solar panel 5, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.
As shown in these drawings, in the non-power generation unit 57, only the metal electrode 54 may be removed, and the semiconductor layer 55 and the transparent electrode 56 may be provided similarly to the solar cell 50. Although the transparent electrode 56 is made of a conductive material, it has a lower electrical conductivity than the metal electrode 54 made of an aluminum conductor or the like, and therefore has a relatively adverse effect on the antenna characteristics of the circularly polarized antenna 4. Small.
Further, the transparent electrode 56 and the semiconductor layer 55 on the surface side of the non-power generation part 57 are provided in the same manner as the solar cell 50, so that when the timepiece 100 is viewed from the dial 1 side, the solar cell 50 and the non-power generation part 57 looks the same.
Therefore, the design property can be improved while suppressing the deterioration of the antenna characteristics of the circularly polarized antenna 4 by making the non-power generation unit 57 only the metal electrode 54 removed.

Further, the non-power generating portion 57 of the solar panel 5 may be provided at a position corresponding to the peripheral edge portion of the radiation electrode 42 as shown in FIG.
Here, FIG. 9 is a plan view showing another modification of the solar panel 5.
As shown in this figure, the non-power generation unit 57 may be an annular one provided not only on the entire radiation electrode 42 of the circularly polarized antenna 4 but only at a position corresponding to the peripheral edge thereof. As described above, in order to keep the antenna characteristics of the circularly polarized antenna 4 good, it is important not to inhibit the spread of the radiation pattern from the peripheral edge of the radiation electrode 42. For this reason, by providing the non-power generating portion 57 only at a position corresponding to the peripheral portion of the radiation electrode 42, that is, above the peripheral portion, the effect of suppressing the deterioration of the antenna characteristics of the circularly polarized antenna 4 can be sufficiently expected. In this case, the non-power generation unit 57 may be one in which only the metal electrode 54 is removed as in the above-described modification.
Further, in this case, by providing an additional solar cell 50 (solar cell 50g) on the inner side of the non-power generation unit 57 (region surrounded by the non-power generation unit 57), a wider light receiving unit of the solar panel 5 is secured. As a result, the power generation capacity can be improved. In this case, the added solar cell 50g is electrically connected in series with the other solar cells 50a to 50f (for example, by the connection parts 52c and 52g in the drawing), or the other solar cells 50a to 50f. Of course, they are formed in substantially the same area.
Therefore, the non-power generation portion 57 is provided at a position corresponding to the peripheral edge of the radiation electrode 42, thereby improving the power generation capability of the solar panel 5 while suppressing the deterioration of the antenna characteristics of the circularly polarized antenna 4. Can be made.

  Further, the method of dividing the solar panel (the number of divisions, the shape of each divided solar cell, etc.) is not limited to that exemplified in the above embodiment.

  Moreover, although the case where the one circularly polarized antenna 4 was provided was illustrated in the said embodiment, the number of the circularly polarized antennas 4 provided in a timepiece is not limited to this.

  The antenna according to the present invention is not limited to a circularly polarized antenna that receives GPS radio waves, but can receive radio waves of a predetermined frequency, such as those that support Bluetooth (registered trademark) and other high-frequency radio communications. I just need it.

In the above embodiment, the case where the timepiece as an electronic device is the analog timepiece 100 that rotates the hands 2 on the dial 1 to display the time and the like is exemplified. However, the timepiece is an analog type timepiece. It is not limited to.
For example, a digital timepiece including a dial (for example, a liquid crystal display unit) that displays various information such as time and calendar information by characters or the like may be used. Further, a dial plate including both an analog display unit and a digital display unit may be included in the electronic device.

Moreover, although the case where the electronic device which concerns on this invention was a timepiece (electronic timepiece) was illustrated in the said embodiment, the said electronic device is not limited to this.
The electronic device according to the present invention may be any device that performs photovoltaic power generation with a solar panel, stores the generated power in a secondary battery, and receives radio waves of a predetermined frequency with an antenna disposed in the vicinity of the solar panel. For example, it may be a biological information display device such as a pedometer, a heart rate meter, or a pulse meter, a display device that displays various information such as movement distance and movement pace information, altitude information, and atmospheric pressure information.

As mentioned above, although several embodiment of this invention was described, the scope of the present invention is not limited to the above-mentioned embodiment, The range of the invention described in the claim, and its equivalent range Including.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
Solar panels for photovoltaic power generation,
A secondary battery for storing electric power generated in the solar panel;
An antenna that is disposed in the vicinity of the solar panel and receives radio waves of a predetermined frequency;
A circuit board for electrically connecting the solar panel and the secondary battery;
With
Among the circuit boards, on the wiring path that electrically connects the solar panel and the secondary battery, the electric resistance to the generated current from the solar panel is low, while the electric wave received by the antenna is reduced. An electronic device comprising a circuit element for increasing electrical resistance.
<Claim 2>
The circuit board is
The solar panel has a positive electrode and a negative electrode electrically connected in series;
The electronic device according to claim 1, wherein the circuit elements are respectively provided on the wiring paths on the positive electrode side and the negative electrode side.
<Claim 3>
The connection position where the solar panel and the circuit board are electrically connected is, in plan view, the solar panel while being orthogonal to a line connecting the center of the antenna and the center of the solar panel in the solar panel. 3. The electronic device according to claim 1, wherein the electronic device is provided in a region opposite to the region where the antenna is provided, with a line passing through the center of the line being a boundary line. 4.
<Claim 4>
The electronic apparatus according to claim 1, wherein the electronic apparatus is an electronic timepiece that displays time.

DESCRIPTION OF SYMBOLS 1 Dial 3 Module 4 Circularly polarized antenna 5 Solar panel 6 Secondary battery 7 Circuit board 42 Radiation electrode 50 Solar cell 54 Metal electrode 55 Semiconductor layer 56 Transparent electrode 57 Non-power generation part 71n-Electrode 71p + Electrode 73 Charge control circuit 74 Inductor (circuit element)
100 Clock 511 Opening

Claims (9)

A panel for generating electricity,
A secondary battery for storing electric power generated in the panel;
A circuit board electrically connected to the secondary battery;
An antenna disposed near the panel for receiving radio waves of a predetermined frequency;
A circuit element having a different electrical resistance to the generated current from the panel and an electrical resistance to the radio wave received by the antenna;
With
The circuit board has a first electrode and a second electrode to which the panel is electrically connected, and the circuit element is on a wiring path between the first electrode side and the second electrode side. An electronic device characterized by being provided respectively.   The electronic apparatus according to claim 1, wherein the first electrode is a positive electrode and the second electrode is a negative electrode.   The electronic device according to claim 1, wherein the circuit element is arranged on the circuit board and on a wiring path that electrically connects the panel and the secondary battery.   The electronic device according to claim 1, wherein the circuit board has the panels electrically connected in series.   The said circuit element is an element which raises the electrical resistance with respect to the electromagnetic wave which the said antenna receives, while becoming low as the electrical resistance with respect to the electric power generation electric current from the said panel. The electronic device described.   The electronic device as described in any one of 1-5 provided with the connection member which electrically connects the said panel and the said circuit board. The connection member is a region in which the antenna is provided with a line passing through the center of the panel orthogonal to a line connecting the center of the antenna and the center of the panel in the plan view. The electronic device according to claim 6, wherein the electronic device is provided in a region on the opposite side through the boundary line.   The electronic device according to claim 1, wherein the panel is a solar panel that performs photovoltaic power generation.   The electronic device according to claim 1, wherein the electronic device is an electronic timepiece that displays time.

Images