JP6829131B2 - Radio clock - Google Patents

Description

The present invention relates to a radio clock that receives a signal from a satellite or the like.

A portable radio-controlled clock that receives time information included in a transmission signal from a satellite constituting a GPS (Global Positioning System) or the like and corrects the time is put into practical use. The arrangement of the antenna for receiving radio waves and the method of supplying power to the antenna are determined so as to obtain the required reception sensitivity without impairing the function of the clock.

FIG. 10 of Patent Document 1 discloses that a dielectric auxiliary member 41 is arranged between the liquid crystal panel 88 and the antenna body 40. By reducing the size of the antenna body 40 due to the wavelength shortening effect, the distance between the antenna body 40 and the liquid crystal panel 88 is secured.

In FIG. 2 of Patent Document 2, in an electronic clock having a solar panel 120A, the GPS antenna 11 includes a ring-shaped dielectric base material 111 and an antenna electrode 112 formed on the surface thereof, and a GPS antenna. It is disclosed that 11 is housed in a non-conductive dial ring 140.

JP 2015-143664 Japanese Unexamined Patent Publication No. 2011-21929

The inventors are considering arranging the antenna electrode in the vicinity of the dial and along the outer circumference of the outer case in the solar radio-controlled timepiece. Generally, in a solar radio-controlled timepiece, the solar cell is arranged immediately behind the dial, so that the antenna electrode and the solar cell are close to each other. Since the solar cell contains metal and has conductivity, the reception sensitivity is affected. On the other hand, if the distance between the solar cell and the antenna electrode is secured, the area of the solar cell becomes small and it becomes difficult to secure electric power.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a radio-controlled timepiece having high reception sensitivity.

(1) A windshield, a dial, a solar cell substrate provided with a light receiving region for converting light incident on the dial into electric power, adjacent to the outer periphery of the dial, and the surface of the dial and the dial. A radio-controlled clock including an antenna provided on at least one of the surfaces of the solar cell substrate, and a highly dielectric member arranged between the antenna and the light receiving region and having a dielectric constant larger than that of the dial.

(2) In (1), the dial or the solar cell substrate has an opening between the antenna and the light receiving region, and at least a part of the high dielectric member is arranged inside the opening. , Radio clock.

(3) In (1) or (2), the dial, the solar cell substrate, the antenna, and a metal outer case in which the antenna is housed are further included, and the highly dielectric member comprises the antenna and the light receiving region. A radio clock including a first portion arranged between the antenna and a second portion arranged outside the antenna.

(4) In (3), the radio-controlled clock further includes a third portion of the antenna adjacent to the windshield side surface of the antenna.

(5) In any one of (1) to (4), the radio-controlled timepiece in which the high-dielectric member is a dial member provided between the windshield and the dial.

According to the present invention, it is possible to provide a radio clock having high reception sensitivity.

It is a top view which shows an example of the satellite radio-controlled wristwatch which concerns on 1st Embodiment. It is sectional drawing in the II-II cutting line of the satellite radio-controlled wristwatch shown in FIG. It is a top view which shows an example of a dial, a solar cell substrate, and an antenna electrode. It is a block diagram which shows the outline of the circuit structure of the satellite radio-controlled wristwatch. It is sectional drawing which shows typically another example of a dial, a solar cell substrate and an antenna electrode. It is a partial cross-sectional view which shows another example of a satellite radio-controlled wristwatch. It is a partial cross-sectional view which shows an example of the satellite radio-controlled wristwatch which concerns on 2nd Embodiment. It is a top view which shows an example of a solar cell substrate and an antenna electrode. It is sectional drawing which shows typically another example of a solar cell substrate and an antenna electrode. It is a partial sectional view which shows another example of a satellite radio-controlled wristwatch. It is a top view which shows another example of a solar cell substrate and an antenna electrode. It is a top view which shows another example of a solar cell substrate and an antenna electrode. It is a top view which shows another example of a solar cell substrate and an antenna electrode. It is a top view which shows another example of a solar cell substrate and an antenna electrode. It is a top view which shows another example of a solar cell substrate and an antenna electrode.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, the satellite radio-controlled wristwatch 1 according to the embodiment of the present invention will be described. The satellite radio-controlled wristwatch 1 according to the present embodiment receives a satellite radio wave including time information, and corrects or positions the time measured by itself using the time information included in the received satellite radio wave.

[First Embodiment]
FIG. 1 is a plan view showing an example of the appearance of the satellite radio-controlled wristwatch 1 according to the first embodiment, and FIG. 2 is a sectional view taken along line II-II of the satellite radio-controlled wristwatch 1 shown in FIG. .. As shown in these figures, the satellite radio-controlled wristwatch 1 has a windshield 31, a bezel 32 for holding the windshield 31, a cylindrical body 38, and a back cover (not shown) provided under the body 38. Including. These constitute the outer shape of the satellite radio-controlled wristwatch 1. The body 38 and the bezel 32 are sandwiched between the windshield 31 and the back cover. The body 38, the bezel 32, and the back cover form the outer case of the satellite radio-controlled wristwatch 1. In the following, the direction from the center of the satellite radio-controlled wristwatch 1 toward the windshield 31 is referred to as upward, and the direction toward the back cover is referred to as downward.

The body 38 is made of metal and has holes at the top and bottom. The bezel 32 is a ring-shaped ceramic that corresponds to the shape of the hole on the body 38, and the bezel 32 is connected to the body 38 by being fitted into the hole above the bezel 32. The back cover is made of metal and has a flat surface corresponding to the shape of the hole under the body 38, and the back cover is fitted in the hole under the hole. The windshield 31 has a planar shape corresponding to the shape of the opening on the upper side of the bezel 32, and is fitted into the opening of the bezel 32. The windshield 31 and the bezel 32 are in contact with each other via packing, and the windshield 31 is fixed by the packing. Further, the bezel 32 and the body 38 are in contact with each other via packing. Further, although the impact resistance and the waterproof property are inferior, the windshield 31 may be fixed to the bezel 32 by caulking or adhesive instead of packing.

Further, the satellite radio-controlled wristwatch 1 includes antenna electrodes 10a and 10b, a ring-shaped dial ring 34, a dial 51, a conductive pin 41, an hour hand 52a, a minute hand 52b and a second hand 52c, a solar cell substrate 53, a main plate, and a movement. These are arranged in a space surrounded by a windshield 31, a bezel 32, a body 38, and a back cover. The dial ring 34 is arranged between the dial 51 and the windshield 31. Further, the dial ring 34 and the antenna electrodes 10a and 10b overlap each other in a plan view. The conductive pin 41 is below the antenna electrodes 10a and 10b. A through hole exists under the antenna electrodes 10a and 10b of the dial 51, and a through hole electrode 42 is formed inside the through hole. The conductive pin 41 is electrically connected to the antenna electrodes 10a and 10b via the through-hole electrode 42. The conductive pin 41 expands and contracts in the vertical direction by a spring. The movement is arranged in an outer case and includes a main plate, a circuit board, a drive circuit, and the like.

FIG. 3 is a plan view showing an example of the dial 51, the solar cell substrate 53, and the antenna electrodes 10a and 10b. In FIG. 3, for the sake of explanation, the dial ring 34 and the outer case are not shown.

The antenna electrodes 10a and 10b are arranged on the upper side (front side) of the dial 51 so as to extend along the peripheral edge of the dial 51. In the example of FIG. 1, each of the antenna electrodes 10a and 10b has an arc shape and is arranged on the front side of the dial 51. The antenna electrodes 10a and 10b receive satellite signals transmitted from the satellite. In particular, in the present embodiment, the antenna electrodes 10a and 10b are so-called dipole antennas, and receive radio waves having a frequency of about 1.6 GHz transmitted from a GPS (Global Positioning System) satellite. GPS is a kind of satellite positioning system, and is realized by a plurality of GPS satellites orbiting the earth. The portions of the antennas 10a and 10b adjacent to each other are feeding points 43. The lower side of the feeding point 43 is in contact with the through-hole electrode 42 and is electrically connected to the conductive pin 41. The antenna electrodes 10a and 10b may be provided on the lower side (back side) of the dial 51.

The solar cell substrate 53 is, for example, an organic film such as polyimide, on which a power generation region 61 containing silicon or metal is formed. The power generation area 61 receives light to generate power. In the example of FIG. 3, the solar cell substrate 53 is circular in a plan view, and almost the entire area of the solar cell substrate 53 is the power generation region 61. The power generation region 61 contains silicon and metal and has conductivity. The solar cell substrate 53 is arranged on the lower side (back side) of the dial 51, and is arranged inside the outer circumference of the dial 51 in a plan view. The power generation region 61 and the antenna electrodes 10a and 10b do not overlap in a plan view.

The dial 51 is provided with an arc-shaped opening 57. The arc-shaped opening 57 is arranged between the power generation region 61 and the antenna electrodes 10a and 10b. Further, the return ring 34 has a protruding portion 34p protruding downward on its lower surface 34d, and the protruding portion 34p is inserted into the opening 57. In other words, at least a part of the protrusion 34p is arranged inside the opening 57. Here, the dial ring 34 contains ceramics, a highly dielectric resin, and the like, and has a higher dielectric constant than the dial 51. In the examples of FIGS. 1 and 3, the arc length of the opening 57 is larger than the sum of the lengths of the antenna electrodes 10a and 10b, but the arc length of the opening 57 is the sum of the lengths of the antenna electrodes 10a and 10b. It may be the same or shorter. Further, the number of openings 57 provided in the dial 51 may be 2 or more. For example, a plurality of openings 57 arranged along the antenna electrodes 10a and 10b as shown by a broken line may be provided on the dial 51.

FIG. 4 is a block diagram showing an outline of the circuit configuration of the satellite radio-controlled wristwatch 1. The balun circuit 21 converts the signals received by the antenna electrodes 10a and 10b in order to connect a balanced antenna such as a dipole antenna to a coaxial wiring having unbalanced characteristics or a receiving circuit 22. The balun circuit 21 and the antennas 10a and 10b are connected via a conductive pin 41. The balun circuit 21 and the antennas 10a and 10b may be connected by an FPC board (flexible printed circuit board). Further, a balun circuit 21 or a matching circuit may be arranged on the FPC board. The matching circuit is a circuit that eliminates impedance mismatch in connection with the antennas 10a and 10b. The receiving circuit 22 is connected to the balun circuit 21 via coaxial wiring. The receiving circuit 22 decodes the signals received by the antenna electrodes 10a and 10b, and outputs a bit string (received data) indicating the contents of the satellite signal obtained as a result of the decoding. More specifically, the receiving circuit 22 includes a high frequency circuit (RF circuit) and a decoding circuit. The high-frequency circuit operates at a high frequency, amplifies and detects the analog signals received by the antenna electrodes 10a and 10b, and converts them into a baseband signal. The decoding circuit decodes the baseband signal output by the high-frequency circuit to generate a bit string indicating the content of the data received from the GPS satellite, and outputs the bit string to the control circuit 26.

The control circuit 26 is a circuit that controls various circuits and mechanisms included in the satellite radio wristwatch 1, and includes, for example, a microcontroller, a motor drive circuit, and an RTC (Real Time Clock). The control circuit 26 acquires the time based on the received data and the clock output by the RTC, and drives the step motor included in the drive mechanism 28 according to the acquired time. The drive mechanism 28 includes a step motor and a train wheel. By transmitting the rotation of the step motor by the train wheel, for example, any one of the hour hand 52a, the minute hand 52b, and the second hand 52c is rotated. This will display the current time.

Circuits and wiring that handle high frequencies such as GPS reception signals tend to have reduced reception sensitivity due to the influence of conductive members such as surrounding metals. In particular, the antenna electrodes 10a and 10b are more susceptible to the influence of the conductive member, and the receiving sensitivity is likely to decrease. On the other hand, if a member having a high dielectric constant is arranged between the antenna electrodes 10a and 10b and the conductive member, the influence of the conductive member on the reception sensitivity can be reduced. In the present embodiment, the reception sensitivity is improved by arranging the members having a high dielectric constant between the power generation region 61 of the solar cell substrate 53 and the antenna electrodes 10a and 10b. Further, the power generation region 61 and the antenna electrodes 10a and 10b can be brought closer to each other, and the power generation region 61 can be easily secured.

Further, the upper surface of the antenna electrodes 10a and 10b is adjacent to the lower surface 34d of the return ring 34 having a high dielectric constant, and the protruding portion 34p is adjacent to the inner peripheral side surface of the antenna electrodes 10a and 10b. As a result, it is possible to obtain the effect of shortening the wavelength of the received radio wave.

Here, the member having a high dielectric constant inserted into the opening 57 does not have to be the return ring 34. FIG. 5 is a cross-sectional view schematically showing another example of the dial 51, the solar cell substrate 53, and the antenna electrodes 10a and 10b. In the example of FIG. 5, a high dielectric material 36 different from the dial ring 34 is arranged in the opening 57. The high dielectric 36 has a first portion that covers the antenna electrodes 10a and 10b, and a second portion that projects downward through the opening 57. The high dielectric 36 has an L-shape in the same cross section as in FIG. The high-dielectric material 36 includes a material having a high dielectric constant such as ceramics and a high-dielectric resin. Also in the example shown in FIG. 5, the influence on the reception sensitivity of the power generation region 61 can be suppressed and the reception sensitivity can be improved. The high dielectric 36 does not have to cover the antennas 10a and 10b, and may have a rectangular cross section.

In the example of FIG. 2, a member having a high dielectric constant is arranged only inside the antenna electrodes 10a and 10b when viewed from the center of the dial 51, but a member having a high dielectric constant is also arranged outside the antenna electrodes 10a and 10b. May be placed. FIG. 6 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1, and is a diagram corresponding to FIG. In the example of FIG. 6, the bezel 32 is made of metal. A protruding portion 34s that protrudes downward is provided on the lower surface 34d of the return ring 34 and on the outer peripheral side of the antenna electrodes 10a and 10b in a plan view. The protruding portion 34s is provided between the metal bezel 32 and the antenna electrodes 10a and 10b. By providing a member having a high dielectric constant between the metal outer case and the antenna electrodes 10a and 10b, it is possible to reduce the influence of the metal of the outer case on the reception sensitivity. Further, when a member having a high dielectric constant is adjacent to the outer side surfaces of the antenna electrodes 10a and 10b in a plan view, the effect of further shortening the wavelength can be obtained.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Hereinafter, the differences from the first embodiment will be mainly described.

FIG. 7 is a partial cross-sectional view showing an example of the satellite radio-controlled wristwatch 1 according to the second embodiment. FIG. 8 is a plan view showing an example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. 7 and 8 are diagrams corresponding to FIGS. 2 and 3. In the second embodiment, the antenna electrodes 10a and 10b are arranged on the front surface of the solar cell substrate 53. The antenna electrodes 10a and 10b may be arranged on the back surface of the solar cell substrate 53.

The solar cell substrate 53 has a power generation region 61 that receives light and generates power. In the example of FIG. 8, the solar cell substrate 53 is circular in a plan view, and its outer peripheral surface faces the inner peripheral surface of the bezel 32. The power generation region 61 has a substantially circular shape and is arranged inside the outer periphery of the solar cell substrate 53. The solar cell substrate 53 is arranged on the lower side (back side) of the dial 51. The power generation region 61 and the antenna electrodes 10a and 10b do not overlap in a plan view. Further, two connection electrodes 62 for extracting the generated electric power are provided on the back side of the solar cell substrate 53 and in the power generation area 61. The two connection electrodes 62 are positive electrodes and negative electrodes, respectively, and the two connection electrodes 62 reach the lower side of the solar cell substrate 53 and are connected to the power supply control circuit. Since each of the two connection electrodes 62 and the feeding portion 43 is connected by a pin or the like, a force is applied. By separating the two connection electrodes 62, the force applied to the solar cell substrate 53 is dispersed. Further, in order to disperse the force, it is preferable that the distance between the region where the two feeding portions 43 are located and the connection electrode 62 and the distance between the two connection electrodes 62 are equal. Further, the two connection electrodes 62 may be arranged symmetrically with the line connecting the region where the two feeding portions 43 are lined up and the central portion of the solar cell substrate 53 as the axis of symmetry. The antenna electrodes 10a and 10b may be formed of the same conductive material as that included in the power generation region 61. In the example of FIG. 8, one-stage solar cells are arranged in the power generation region 61 of the solar cell substrate 53, but a plurality of stages of solar cells may be arranged. This also applies to the modified examples described below. Further, an additional solar cell substrate 53 may be provided on the inner peripheral side wall of the dial ring 34. The area of the power generation region 61 is increased by the power generation region 61 of the ring-shaped solar cell substrate 53 on the side wall thereof.

The solar cell substrate 53 is provided with an arc-shaped opening 59. The arc-shaped opening 59 is arranged between the power generation region 61 and the antenna electrodes 10a and 10b. Further, the return ring 34 has a protruding portion 34p protruding downward on its lower surface 34d, and the protruding portion 34p is inserted into the opening 59. In other words, at least a part of the protrusion 34p is arranged inside the opening 59. The dial 51 is arranged inside the opening 59 in a plan view. Further, the dial ring 34 has a higher dielectric constant than the organic film and dial 51 of the solar cell substrate 53.

Also in this embodiment, a member having a high dielectric constant is arranged between the power generation region 61 of the solar cell substrate 53 and the antenna electrodes 10a and 10b. As a result, the reception sensitivity is improved. Further, the power generation region 61 and the antenna electrodes 10a and 10b can be brought closer to each other, and the power generation region 61 can be easily secured. Further, since the lower surface 34d and the protruding portion 34p of the return ring 34 are adjacent to the antenna electrodes 10a and 10b, the effect of shortening the wavelength of the received radio wave can be obtained.

Further, since the solar cell substrate 53 is an organic film, the manufacturing tolerance is small and misalignment is unlikely to occur. Therefore, the antenna electrodes 10a and 10b can be accurately formed, and variations in antenna characteristics can be reduced. Further, not only the antenna electrodes 10a and 10b but also the feeding point and the feeding wiring can be easily formed on the solar cell substrate 53. Since the dielectric constant of the organic film is higher than that of the resin, it is possible to obtain a slightly higher wavelength shortening effect than when the antenna electrodes 10a and 10b are formed on the dial 51.

FIG. 9 is a cross-sectional view schematically showing another example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. In the example of FIG. 9, a high dielectric material 36 different from the dial ring 34 is arranged in the opening 59. The high dielectric 36 has a first portion that covers the antenna electrodes 10a and 10b, and a second portion that projects downward through the opening 57. The high dielectric 36 has an L-shape in the radial cross section including the opening 57. The high dielectric 36 may be arcuate in plan view. Also in the example shown in FIG. 9, the influence on the reception sensitivity of the power generation region 61 can be suppressed and the reception sensitivity can be improved. Here, the return ring 34 may be a light transmitting member. In this case, an additional power generation region 61 is also provided in the region where the dial ring 34 and the solar cell substrate 53 overlap in a plan view, and power can be generated in the additional power generation region 61.

FIG. 10 is a partial cross-sectional view showing another example of the satellite radio-controlled wristwatch 1. In the example of FIG. 10, the bezel 32 is made of metal. Further, a protruding portion 34s protruding downward is provided on the lower surface 34d of the return ring 34 and on the outer peripheral side of the antenna electrodes 10a and 10b in a plan view. The protruding portion 34s is provided between the metal bezel 32 and the antenna electrodes 10a and 10b. By providing a member having a high dielectric constant between the metal outer case and the antenna electrodes 10a and 10b, it is possible to reduce the influence of the metal of the outer case on the reception sensitivity. Further, when a member having a high dielectric constant is adjacent to the outside of the antenna electrodes 10a and 10b in a plan view, the effect of further shortening the wavelength can be obtained. Further, the protrusion 34s secures the distance between the antenna electrodes 10a and 10b and the bezel 32 and the case 38, and the bezel 32 and the antenna electrodes 10a and 10b do not overlap in a plan view. This also makes it possible to reduce the influence of the bezel 32 and the like on the reception sensitivity.

The outer circumference of the dial 51 may be outside the antenna electrodes 10a and 10b. In this case, the dial 51 may also be provided with an opening 57. Further, the solar cell substrate 53 in which the power generation region 61 is inside the opening 59 may be used for the satellite radio-controlled wristwatch according to the first embodiment. In these cases, a member having a high dielectric constant may be arranged so as to penetrate the opening 57 of the dial 51 and the opening 59 of the solar cell substrate 53.

FIG. 11 is a plan view showing another example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. In the example of FIG. 11, unlike the example of FIG. 8, the antenna electrodes 10a and 10b and the balun circuit 21 are connected by a balun board 46 which is an FPC board instead of the conductive pin 41. An electrode in contact with the antenna electrodes 10a and 10b, a balun circuit 21, and a connection electrode 44 are arranged on the balun substrate 46. The balun circuit 21 is arranged between the antenna electrodes 10a and 10b and the connection electrode 44. In FIG. 11, the balun substrate 46 projects outward in the radial direction, but inside the satellite radio-controlled wristwatch 1, the balun circuit 21 and the connection electrode 44 are bent so as to overlap the solar cell substrate 53 in a plan view. The connection electrode 44 is an electrode for electrically connecting the balun circuit 21 and the receiving circuit 22, and is electrically connected to the circuit board arranged under the solar cell substrate 53. The connection electrode 44 has a coaxial structure. Here, the balun substrate 46 and the solar cell substrate 53 may be integrated. If the solar cell substrate 53 is an organic film, the solar cell substrate 53 may have a protruding portion corresponding to a balun substrate, and the protruding portion may be bent.

FIG. 12 is a plan view showing another example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. In the example of FIG. 11, unlike the example of FIG. 8, the power generation region 61 includes a first arc-shaped region adjacent to the opening 59 and a second arc-shaped region not adjacent to the opening 59 and having a radius larger than that of the first arc-shaped region. And include. The outer peripheral end of the second arc-shaped region is adjacent to the outer peripheral edge of the solar cell substrate 53. The connection electrode 62 is provided in the second arcuate region, and the distance from the center is larger than the radius of the first arcuate region. In the example of FIG. 12, the solar cell substrate 53 does not overlap with the dial ring 34 in a plan view. As a result, the power generation region 61 can be secured while the antennas 10a and 10b are arranged inside in the radial direction. Further, since each of the two connection electrodes 62 and the feeding portion 43 is connected by a pin or the like, a force is applied. By separating the two connection electrodes 62, the force applied to the solar cell substrate 53 is dispersed. Further, in order to disperse the force, it is preferable that the distance between the region where the two feeding portions 43 are located and the connection electrode 62 and the distance between the two connection electrodes 62 are equal. The return ring 34 may be a light-transmitting member so that the return ring 34, the antenna electrodes 10a and 10b, and a part of the second arc-shaped region overlap each other in a plan view.

FIG. 13 is a plan view showing another example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. In the example of FIG. 13, unlike the example of FIG. 8, the connection electrode 62 of the power generation region 61 and the feeding portion 43 are provided so as to sandwich the central portion of the solar cell substrate 53. The two connecting electrodes 62 are adjacent to each other. Further, the power generation region 61 includes a circular region and a region protruding outward from the circular region. The connection electrode 62 is arranged in the protruding region thereof. Further, the openings 59, the antennas 10a and 10b, and the connection electrodes 62 overlap with the return ring 34 in a plan view, and it is possible to prevent deterioration of aesthetics due to these being visually recognized from the front side. Further, since the connection electrode 62 is separated from the feeding unit 43, the influence on the reception sensitivity can be further reduced.

FIG. 14 is a plan view showing another example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. In the example of FIG. 14, the balun circuit 21, the matching circuit, and the connection electrode 44 are arranged on the lower surface of the solar cell substrate 53. Further, the power generation region 61 is provided so as not to overlap the balun circuit 21, the matching circuit, and the connection electrode 44 in a plan view. More specifically, the power generation region 61 has a shape in which a rectangular region on the radial inside of the feeding point 43 from the power generation region 61 in the example of FIG. 12 is cut out. The balun circuit 21, the matching circuit, and the connection electrode 44 are arranged so as to overlap the notched rectangular region. In the example of FIG. 14, the balun circuit 21 and the like can be arranged at a position closer to the windshield, and the influence of the movement on the reception sensitivity can be easily reduced. Further, since the power generation region 61 does not overlap with the balun circuit 21, the matching circuit, and the connection electrode 44 in a plan view, the influence of the metal contained in the power generation region 61 on the reception sensitivity can be reduced. The balun circuit 21 and the matching circuit can also be arranged on the front surface of the solar cell substrate 53. In order to prevent the influence of the thickness of the balun circuit 21, the balun circuit 21 and the matching circuit are preferably arranged on the back surface.

In the example of FIG. 14, the opening 59 is divided into two parts. One of the two portions is adjacent to the antenna electrode 10a and the other is adjacent to the antenna electrode 10b. There is a connection area between the two portions of the opening 59 of the solar cell substrate 53. The connection area connects the outside in the radial direction from the opening 59 and the inside in the radial direction from the opening 59, and a wiring for connecting the power feeding unit 43 and the balun circuit 21 is arranged in the connection area.

FIG. 15 is a plan view showing another example of the solar cell substrate 53 and the antenna electrodes 10a and 10b. In the example of FIG. 15, unlike the example of FIG. 14, the connection electrode 44 and the power generation region 61 overlap in a plan view. Since the circuits from the antenna electrodes 10a and 10b to the balun circuit 21 are particularly susceptible to the influence of metal, it is desirable that the balun circuit 21 and the power generation region 61 do not overlap in a plan view. On the other hand, the influence of metal on the connection path from the balun circuit 21 to the receiving circuit 22 is relatively small. By overlapping the connection electrode 44, which is less affected by metal, and the power generation region 61, it is possible to secure the power generation region 61 while suppressing a decrease in reception sensitivity. In the example of FIG. 15, the opening 59 is divided into two portions as in the example of FIG. 14, and a connecting region is formed between the two portions of the opening 59.

Although the case where the present invention is applied to the satellite radio-controlled wristwatch 1 has been described so far, it can also be applied to, for example, a small portable timepiece different from the wristwatch.

1 satellite radio wristwatch, 10a, 10b antenna electrode, 21 balun circuit, 22 receiving circuit, 26 control circuit, 28 drive mechanism, 31 windshield, 32 bezel,
34 dial ring, 34d lower surface, 34p, 34s protrusion, 36 high dielectric, 38 body, 41 conductive pin, 42 through-hole electrode, 43 feeding part, 44 connection electrode, 46 balun board, 51 dial, 52a hour hand, 52b Minute hand, 52c second hand, 53 solar cell substrate, 57,59 openings, 61 power generation area, 62 connection electrodes.

Claims (4)

With the windshield
Dial and
A solar cell substrate provided with a light receiving region that converts light incident on the dial into electric power.
An antenna that is adjacent to the outer periphery of the dial and is provided on at least one of the surface of the dial and the surface of the solar cell substrate.
A highly dielectric member arranged between the antenna and the light receiving region and having a dielectric constant larger than that of the dial is included.
The dial or the solar cell substrate has an opening between the antenna and the light receiving region.
At least a portion of the high dielectric member is located inside the opening.
Radio clock. With the windshield
Dial and
A solar cell substrate provided with a light receiving region that converts light incident on the dial into electric power.
An antenna that is adjacent to the outer periphery of the dial and is provided on at least one of the surface of the dial and the surface of the solar cell substrate.
A highly dielectric member arranged between the antenna and the light receiving region and having a dielectric constant larger than that of the dial.
Includes the dial, the solar cell substrate, the antenna and a metal outer case in which the antenna is housed .
The high-dielectric member includes a first portion arranged between the antenna and the light receiving region, and a second portion arranged outside the antenna.
Radio clock. In the radio-controlled timepiece according to claim 2 .
The highly dielectric member further includes a third portion of the antenna adjacent to the windshield side surface.
Radio clock. In the radio-controlled timepiece according to any one of claims 1 to 3 ,
The high-dielectric member is a facing member provided between the windshield and the dial.
Radio clock.

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