JP2019191146A - Electronic timepiece - Google Patents

Abstract

To provide an electronic timepiece capable of suppressing reduction of power generation performance of a solar battery and also suppressing reduction of performance of an antenna.SOLUTION: An electronic timepiece 100 comprises a pointer shaft 25, a dial 6 having optical transparency through which the pointer shaft penetrates, an antenna 3 having a radiation electrode through which the pointer shaft penetrates and a solar battery 5 disposed between the dial and the radiation electrode, through which the pointer shaft penetrates. The solar battery has a power generation part for converting light into electric energy, which overlaps the radiation electrode in a plan view seen from a thickness direction of the dial. A part or all of the outer periphery of the radiation electrode is positioned outside of the power generation part in a plan view.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electronic timepiece.

  There is known an electronic timepiece including an antenna that receives a satellite signal and a solar cell that converts light energy into electric power.

Patent Document 1 discloses an electronic timepiece including an antenna and a solar panel.
The antenna includes a radiation electrode, a ground electrode, and a dielectric provided therebetween. In such an electronic timepiece, the radiation electrode is formed of a transparent electrode such as ITO (Indium Tin Oxide), and a solar panel is disposed between the radiation electrode and the dielectric. With this configuration, light can be incident on the solar panel via the radiation electrode, and photovoltaic power generation is possible. In addition, since the radiation electrode is on the surface glass side of the electronic timepiece with respect to the solar panel, it is possible to suppress the satellite signal to the radiation electrode from being attenuated by the solar panel, and it is possible to suppress a decrease in reception performance of the radiation electrode.

JP 2012-93211 A

  However, in the electronic timepiece described in Patent Document 1, since the radiation electrode is on the surface glass side of the solar panel, even if the radiation electrode is formed of a transparent electrode, the amount of light incident on the solar panel is equivalent to the radiation electrode. Will be reduced. For this reason, there is a problem that the power generation performance of the solar panel is lowered.

  An electronic timepiece according to one aspect of the present invention includes a pointer shaft, a light-transmitting dial plate through which the pointer shaft passes, an antenna having a radiation electrode through which the pointer shaft passes, the dial plate, and the radiation electrode. A solar cell that is disposed between the indicator shaft and the pointer shaft, and the solar cell overlaps the radiation electrode in a plan view when viewed from the thickness direction of the dial, and converts light into electrical energy. And a part of the outer periphery of the radiation electrode is located outside the power generation unit in the plan view.

  According to one embodiment of the present invention, since the solar cell is provided between the dial and the radiation electrode, light incident on the solar cell is not blocked by the radiation electrode, and thus the power generation performance of the solar cell is reduced. Can be suppressed. In addition, since a part or all of the outer periphery of the radiation electrode functioning as a signal radiation unit is located outside the power generation unit, it is possible to suppress degradation in antenna performance during reception and transmission.

  In one aspect of the present invention, it is preferable that the entire outer periphery of the radiation electrode is located outside the power generation unit in the plan view.

  According to this aspect, since the entire outer periphery of the radiation electrode is positioned outside the power generation unit, it is possible to suppress a decrease in the performance of the antenna.

  In one aspect of the present invention, the power generation unit is a first power generation unit located inside the outer periphery of the radiation electrode in the plan view, and the solar cell is located outside the radiation electrode in the plan view. It has a 2nd electric power generation part, and it is preferable that the said 1st electric power generation part and the said 2nd electric power generation part are connected by wiring.

  According to this aspect, since the first power generation unit and the second power generation unit are included, there are many portions that contribute to the power generation of the solar cell as compared with the case where the second power generation unit is not provided, and thus the power generation performance of the solar cell is improved. be able to.

  In one aspect of the present invention, the power generation unit preferably includes a plurality of solar cells, and includes a booster circuit that boosts a voltage generated by the power generation unit.

  According to this aspect, energy can be efficiently extracted from the solar cell.

  In one aspect of the present invention, the antenna is preferably an inverted-F antenna having a ground electrode that is separated from the radiation electrode and a short-circuit portion that short-circuits the radiation electrode and the ground electrode.

  According to this aspect, the electronic timepiece can be reduced in size.

  In one aspect of the present invention, it is preferable that an electrode for providing a circuit board and connecting the circuit board and the solar cell is provided outside the short-circuit portion in the plan view.

  According to this aspect, it is possible to reduce the possibility that the performance of the radiation electrode is deteriorated due to the current flowing through the electrode.

  In one aspect of the present invention, the antenna is preferably a planar antenna.

  According to this aspect, the electronic watch can be thinned.

  In one aspect of the present invention, it is preferable that an annular date indicator and a date indicator holder that is provided with the radiation electrode and hold the date indicator are provided.

  According to this aspect, the number of parts of the electronic timepiece can be further reduced.

It is a perspective view of the electronic timepiece concerning a 1st embodiment. It is sectional drawing of the electronic timepiece shown in FIG. FIG. 3 is a partially enlarged view of the electronic timepiece shown in FIG. 2. It is a top view which shows the solar cell and antenna pattern which are shown in FIG. It is a top view which shows the solar cell and antenna pattern which the electronic timepiece concerning 2nd Embodiment has. It is a top view which shows the solar cell and antenna pattern which the electronic timepiece concerning 3rd Embodiment has. It is a partial expanded sectional view of the electronic timepiece concerning 3rd Embodiment. It is a top view which shows the solar cell which the electronic timepiece concerning 4th Embodiment has.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the size and scale of each part are appropriately different from the actual ones. Further, the scope of the present invention is not limited to these forms unless otherwise specified in the following description.

<First Embodiment>
FIG. 1 is a perspective view of an electronic timepiece according to the first embodiment. FIG. 2 is a cross-sectional view of the electronic timepiece shown in FIG.

  An electronic timepiece 100 shown in FIG. 1 is a wristwatch-type wrist device that can be worn on a user's wrist. The electronic timepiece 100 has a wristwatch function that receives a satellite signal from a GPS satellite and corrects the internal time, and a function that performs positioning calculation using GPS time information and orbit information.

As shown in FIG. 1, an electronic timepiece 100 includes a case 10, a light-transmitting plate-like cover 14 attached to the case 10, and a mounting member attached to the case 10 and used for mounting to a user. And a pair of belts 191 and 192.
Hereinafter, the cover 14 side of the electronic timepiece 100 is referred to as “front side” or “upper side”, and the side that is located on the opposite side and contacts the user's wrist is referred to as “back side” or “lower side”. Moreover, light transmittance means the transparency of the grade which can permeate | transmit the light which contributes to the electric power generation of the solar cell 5 accommodated in case 10 mentioned later (refer FIG. 2). Moreover, the cover 14 has a light transmittance with respect to visible light so that the dial 6 accommodated in the case 10 to be described later can be visually recognized.

  As shown in FIG. 2, the case 10 includes a cylindrical body part 11 and a back cover 12 that closes an opening on the back side of the two openings of the body part 11. An annular bezel 13 is provided on the front side of the body 11. Inside the bezel 13, a plate-like cover 14 having light transmittance is disposed. As shown in FIG. 1, the trunk portion 11 is provided with a crown 181 and a plurality of buttons 182. By operating these, the display of the electronic timepiece 100 can be changed.

  Each constituent material of the trunk | drum 11 and the back cover 12 is not specifically limited, For example, various resin materials, metal materials, such as stainless steel, etc. are mentioned. Moreover, as a constituent material of the cover 14, a glass material, various resin materials, etc. are mentioned, for example. In the figure, the case 10 is composed of two members, ie, the body portion 11 and the back cover 12. However, the case 10 may be composed of three or more members, or may be composed of one member. Good. In the drawing, the plan view shape of the case 10 is circular, but the plan view shape of the case 10 is not limited to this, and may be a square or the like.

  As shown in FIG. 1, a belt 191 and a belt 192 are detachably attached to the body portion 11. The constituent materials of the belt 191 and the belt 192 are not particularly limited. For example, various resin materials and metal materials such as stainless steel can be used.

  As shown in FIG. 2, the electronic timepiece 100 includes a ground plane 21, a circuit board 22, a secondary battery 23, a drive mechanism 24, a pointer shaft 25, a plurality of hands 261, 262, and 263, and an antenna 3. A date wheel 41, a solar battery 5, a holding member 42, a dial 6, and a parting plate 43. These are accommodated in the space formed by the cover 14, the bezel 13 and the case 10 described above. Hereinafter, viewing from the thickness direction of the dial 6 is referred to as “plan view”.

  The main plate 21 is pushed up by, for example, the middle frame 211, and the cross-sectional direction is positioned. The ground plane 21 is configured using materials such as various resin materials, for example. The ground plane 21 is formed with a plurality of recesses for arranging the secondary battery 23 and the drive mechanism 24.

  The secondary battery 23 is charged by power from the solar battery 5 described later, and supplies power to the drive mechanism 24 and the like. Examples of the secondary battery 23 include a lithium ion secondary battery. In addition, a pointer shaft 25 is connected to the drive mechanism 24, and the pointer shaft 25 can be rotated by the drive mechanism 24. The drive mechanism 24 includes a step motor 241 as a drive source and a train wheel 242 as a power transmission mechanism that transmits the drive force from the step motor 241 to the pointer shaft 25.

The pointer shaft 25 protrudes from the main plate 21 toward the cover 14 side. A plurality of hands 261, 262, and 263 for indicating the time are attached to the pointer shaft 25.
The pointers 261, 262, and 263 are respectively positioned closer to the cover 14 than the dial 6 described later, and rotate around the pointer shaft 25.

  A circuit board 22 is fixed to the back surface of the base plate 21 by screwing or the like. The circuit board 22 includes, for example, a central processing unit (CPU), a random access memory (RAM), and a real time clock (RTC). The circuit board 22 includes a control circuit that controls driving of the step motor 241 and the like.

  The antenna 3 is disposed on the surface of the ground plane 21. The antenna 3 receives satellite signals from GPS satellites. The antenna 3 has a plate shape with a circular shape in plan view. In addition, a through hole 301 for inserting the pointer shaft 25 is formed at the center of the antenna 3 in plan view.

  FIG. 3 is a partially enlarged view of the electronic timepiece shown in FIG. In the present embodiment, the antenna 3 is specifically an inverted F antenna having a flat plate shape, and as shown in FIG. 3, an antenna plate 31, a dielectric 32, an antenna pattern 33, and a short-circuit portion 34. Have.

  The antenna plate 31 has a disk shape. The antenna plate 31 has conductivity and functions as a ground electrode, that is, a ground electrode. The antenna plate 31 functions as a magnetically resistant plate. That is, the antenna plate 31 has a function of protecting the drive mechanism 24 and the like from an external magnetic field. In addition, the antenna plate 31 has a configuration in which a metal film such as copper, gold, or nickel is formed on a plate-like member formed of pure iron and ferritic stainless steel, for example.

  The antenna pattern 33 is connected to a power supply pin 35 (power supply unit) having conductivity. The antenna pattern 33 and the circuit board 22 are electrically connected by the power feed pin 35.

  The dielectric 32 has a disc shape and is located between the antenna plate 31 and the antenna pattern 33. By using the dielectric 32, the antenna 3 can be downsized due to the wavelength short-circuit effect. The dielectric 32 is made of a member having a small dielectric loss tangent, for example, a resin member having a dielectric loss tangent of about 1 × 10 −4. By using a member having a small dielectric loss tangent, it is possible to suppress a decrease in the performance of the antenna 3.

  An annular recess 321 is formed on the lower surface of the dielectric 32. An annular date wheel 41 is disposed in the recess 321, and the dielectric 32 functions as a date wheel holder. The date wheel 41 is rotatable by a wheel train (not shown) (see FIG. 2). In addition, the dielectric 32 has a light shielding property, and an opening for allowing a part of the date wheel 41 to be visually recognized is formed in the dielectric 32.

  As shown in FIG. 3, the antenna pattern 33 is provided on the dielectric 32 and forms a thin film with a circular shape in plan view. The antenna pattern 33 overlaps the antenna plate 31 in plan view. The antenna pattern 33 functions as a radiation electrode that determines the frequency of the antenna 3 and the polarization of the received radio wave. The antenna pattern 33 is made of a conductive member, for example, a metal film such as copper, gold, or nickel.

  The short-circuit part 34 is provided so as to cover a part of the side surface of the dielectric 32. Specifically, the short-circuit portion 34 is located at a location corresponding to 12:00 on the side surface of the dielectric 32. Since the short-circuit portion 34 is located at a location corresponding to 12:00, the directivity of the antenna 3 is directed toward the 9 o'clock side, so that the antenna 3 can easily receive radio waves while walking. Moreover, the short circuit part 34 has connected the antenna board 31 and the antenna pattern 33, and has short-circuited these. Moreover, the short circuit part 34 is comprised with the member which has electroconductivity, for example, is comprised with metal films, such as copper, silver, and nickel. Specifically, for example, the short-circuit portion 34 is formed integrally with the antenna pattern 33, extends from the antenna pattern 33, is routed from the side surface of the dielectric 32 to a part of the lower surface, and is screwed to the antenna plate 31. Conducted by tightening or the like. In addition, each constituent material of the short circuit part 34 and the antenna pattern 33 may be the same or different.

  An annular holding member 42 that holds the solar cell 5 while positioning the solar cell 5 is provided outside the antenna 3. The holding member 42 holds a dial 6 described later. The holding member 42 is fixed to the upper surface of the main plate 21. Further, the holding member 42 is separated from the antenna 3. The holding member 42 is made of, for example, a resin member.

  The solar cell 5 is a disk-shaped solar panel and has a function of converting light such as sunlight into electrical energy. Note that the electrical energy generated by the solar battery 5 is stored in the secondary battery 23. The solar cell 5 is located above the antenna 3. In addition, a through hole 501 for inserting the pointer shaft 25 is formed at the center of the solar cell 5 in plan view (see FIG. 2). The through hole 501 communicates with the above-described through hole 301 of the antenna 3.

  FIG. 4 is a plan view showing the solar cell and antenna pattern shown in FIG. As illustrated in FIG. 4, the solar cell 5 includes a power generation unit 51 that contributes to power generation by the solar cell 5 and a non-power generation unit 52 that does not contribute to power generation by the solar cell 5. In FIG. 4, a dot pattern is attached to the non-power generation unit 52 in order to facilitate the understanding of the arrangement of the non-power generation unit 52.

The power generation unit 51 includes a plurality of solar cells 511 divided by a plurality of dividing lines 502 extending from the through hole 501 toward the outer periphery 504 side. In the figure, the number of solar cells 511 is eight. The plurality of solar cells 511 are connected in series.
In addition, the solar cell 511 is formed, for example, by laminating a resin base material, a metal electrode, a semiconductor layer, a transparent electrode, and a protective layer in this order from the antenna pattern 33 side. The semiconductor layer is formed so that the p-type semiconductor and the n-type semiconductor sandwich the i-type semiconductor. Note that the configuration of the solar cell 511 is not limited to this.

  The non-power generation unit 52 surrounds the power generation unit 51 in plan view. The non-power generation unit 52 does not have the metal electrode and the transparent electrode that the solar cell 511 has, and can transmit radio waves received by the antenna 3. Specifically, the non-power generation unit 52 is formed, for example, by laminating a resin base material, a semiconductor layer, and a protective layer in this order from the antenna pattern 33 side. Note that the structure of the non-power generation unit 52 does not have to be this, and for example, there may be no semiconductor layer.

  In addition, the non-power generation unit 52 is provided with a plurality of electrodes 531 for taking out the energy obtained by the solar cell 5, and is connected to the circuit board 22 through lead terminals (not shown). The electrode 531 is connected to the power generation unit 51 through the connection unit 532. The electrode 531 is located outside the antenna pattern 33 in plan view.

  As illustrated in FIG. 4, the size of the solar cell 5 in plan view is larger than the size of the antenna pattern 33 in plan view, and the solar cell 5 includes the antenna pattern 33 in plan view. Therefore, the outer periphery 504 of the solar cell 5 is located outside the outer periphery 302 of the antenna pattern 33 in plan view. The size of the power generation unit 51 of the solar cell 5 in plan view is smaller than the size of the antenna pattern 33 in plan view, and the antenna pattern 33 includes the power generation unit 51 in plan view. Therefore, the outer periphery 302 of the antenna pattern 33 is located outside the outer periphery 503 of the power generation unit 51 in plan view.

  Further, as shown in FIG. 3, a disk-shaped dial 6 is provided above the solar cell 5. The dial 6 is fixed to the upper surface of the holding member 42 and is separated from the solar cell 5. A through-hole 601 for inserting the pointer shaft 25 is formed in the central portion of the dial 6 in plan view (see FIG. 2). The through hole 601 and the through hole 501 of the solar cell 5 described above communicate with each other. The dial 6 has light transparency and insulation, and is made of a resin member such as polycarbonate. Further, the dial 6 is provided with a date window for allowing a part of the date dial 41 to be visually recognized at a position corresponding to the opening provided in the dielectric 32.

  As shown in FIG. 3, an annular parting plate 43 is provided on the dial 6. The parting plate 43 is provided so as to cover the outer periphery 504 of the solar cell 5 in plan view. Further, the constituent material of the parting plate 43 is not particularly limited, but it is preferable to use various resin materials so as to reduce or prevent blocking of signals received by the antenna 3.

  Here, as described above, the electronic timepiece 100 has an antenna having the pointer shaft 25, the dial 6 having light permeability through which the pointer shaft 25 passes, and the antenna pattern 33 which is a radiation electrode through which the pointer shaft 25 passes. 3 and the solar cell 5 disposed between the dial 6 and the antenna pattern 33 and through which the pointer shaft 25 passes (see FIGS. 2 and 3). As shown in FIG. 4, the solar cell 5 includes a power generation unit 51 that overlaps all of the antenna pattern 33 in a plan view as viewed from the thickness direction of the dial 6 and converts light into electric energy. The outer periphery 302 of the antenna pattern 33 is located outside the power generation unit 51 in plan view.

  According to the electronic timepiece 100, as shown in FIG. 3, the solar cell 5 is provided between the dial 6 and the antenna pattern 33, so that light incident on the solar cell 5 is blocked by the antenna pattern 33. Therefore, a decrease in power generation performance of the solar cell 5 can be suppressed.

  In the antenna 3, the strongest radio wave is radiated from the outer periphery 302 of the antenna pattern 33 toward the external space. That is, the outer periphery 302 of the antenna pattern 33 functions as a radiating portion that radiates particularly strong radio waves. Therefore, as shown in FIG. 4, since the outer periphery 302 of the antenna pattern 33 is located outside the power generation unit 51 in plan view, it is possible to suppress a decrease in the performance of the antenna 3. In particular, since the frequency of the satellite signal from the GPS satellite is high, the radio wave is likely to be attenuated by the power generation unit 51 having a metal electrode containing a metal material or a transparent electrode, and the performance of the antenna 3 is likely to deteriorate. Therefore, the deterioration of the performance of the antenna 3 can be effectively reduced by positioning the outer periphery 302 of the antenna pattern 33 outside the power generation unit 51.

  Further, by using the antenna pattern 33 through which the pointer shaft 25 passes, it is not necessary to arrange the antenna 3 avoiding the pointer shaft 25, and the planar size of the antenna pattern 33 can be increased. Further, by using the solar cell 5 through which the pointer shaft 25 penetrates, it is not necessary to arrange the solar cell 5 avoiding the pointer shaft 25, and the planar size of the solar cell 5 can be increased. Therefore, the power generation performance of the solar cell 5 can be enhanced.

  As shown in FIG. 4, the power generation unit 51 is located inside the outer periphery 302 of the antenna pattern 33 in plan view.

  According to this arrangement, since the entire outer periphery 302 of the antenna pattern 33 is located outside the power generation unit 51 in plan view, the performance degradation of the antenna pattern 33 can be particularly effectively reduced.

  If at least a part of the outer periphery 302 of the antenna pattern 33 is located outside the power generation unit 51 in plan view, the antenna 3 is compared with the case where the entire outer periphery 302 overlaps the power generation unit 51 in plan view. The performance degradation can be suppressed.

  In addition, as shown in FIG. 4, by arranging the power generation unit 51 in almost the entire region inside the outer periphery 302 of the antenna pattern 33, good power generation by the solar cell 5 without impairing the performance of the antenna 3. Performance can be obtained. For this reason, the transmittance of the dial 6 can be lowered to improve the appearance quality.

  Further, as shown in FIG. 3, the outer periphery 504 of the solar cell 5 is covered with the parting plate 43 in plan view, so that the boundary between the holding member 42 and the solar cell 5 is formed in a region inside the parting plate 43. No need to position. Therefore, the inside of the electronic timepiece 100 that can be visually recognized through the cover 14 can have a uniform appearance, and the aesthetics of the electronic timepiece 100 can be improved.

Further, the distance in the planar direction between the outer periphery of the antenna pattern 33 and the outer periphery of the power generation unit 51 may be set as appropriate so that the influence on the performance of the antenna 3 can be reduced. Specifically, for example, the separation distance between the outer periphery 503 of the power generation unit 51 and the antenna pattern 33 is about 0.5 mm.

  As shown in FIG. 4, the electrode 531 is located outside the antenna pattern 33 and outside the short-circuit portion 34 in plan view. Since the electrode 531 is positioned outside the short-circuit portion 34 as described above, it is possible to reduce the possibility that the performance of the antenna 3 is deteriorated due to the current flowing through the lead terminal connecting the electrode 531 and the circuit board 22. Further, as shown in FIG. 4, since there is no metal layer that crosses the outer periphery 302 of the antenna pattern 33 in a plan view other than the connection portion 532, the performance of the antenna 3 can be improved by shielding the outer periphery 302 of the antenna pattern 33 with the metal layer. Degradation can be minimized.

  Further, since the antenna 3 has a flat plate shape, the solar cell 5, the antenna 3, the secondary battery 23, and the drive mechanism 24 can be planarly overlapped as shown in FIG. 2. Therefore, the electronic watch 100 can be thinned. Further, it is not necessary to dispose the secondary battery 23 and the drive mechanism 24 so as not to overlap the antenna 3 while avoiding the antenna 3, and thus the degree of freedom in disposition of the secondary battery 23 and the drive mechanism 24 can be increased.

  As described above, the antenna 3 is an inverted F antenna having the antenna plate 31 that is a ground electrode that is separated from the antenna pattern 33, and the antenna pattern 33 and the antenna plate 31 are short-circuited by the short-circuit portion 34.

  By using the antenna 3 that is an inverted F antenna, as described above, even if the solar cell 5 and the antenna pattern 33 are overlapped in a plan view, the thickness of the electronic timepiece 100 can be prevented from becoming excessively large. .

  As described above, the antenna plate 31 included in the antenna 3 functions as a magnetic-resistant plate. Therefore, the drive mechanism 24 and the like can be protected from an external magnetic field without using a separate magnetic plate. Moreover, since it is not necessary to prepare a separate magnetic-resistant plate, the number of parts of the electronic timepiece 100 can be reduced. Therefore, the electronic watch 100 can be thinned.

  Furthermore, as described above, the dielectric 32 functions as a date dial holder. For this reason, it is not necessary to prepare a date dial holder separately, so that the number of parts of the electronic timepiece 100 can be further reduced. Therefore, the electronic watch 100 can be further reduced in thickness.

  The electronic timepiece 100 has been described above. According to the electronic timepiece 100, it is possible to provide a configuration that combines the performance of the antenna 3, the power generation performance of the solar cell 5, the appearance quality of the electronic timepiece 100, and the size and thickness of the electronic timepiece 100.

  The electronic timepiece 100 only needs to include at least the dial 6, the pointer shaft 25, the antenna pattern 33, and the solar battery 5, and other components can be omitted as appropriate. It can be replaced with other parts that perform their functions.

  Moreover, although the antenna plate 31 has a function as a magnetic-resistant plate, it does not need to have the said function. For example, an electrode pattern that functions as the antenna plate 31 may be provided on the lower surface of the dielectric 32. In this case, the magnetically resistant plate may be provided separately.

  Moreover, although the dielectric material 32 has the function of a date indicator press, it does not need to have the said function. That is, the date indicator holder may be provided separately from the dielectric 32. Moreover, the dielectric 32 may be comprised, for example with the ground plane.

In the present embodiment, the antenna 3 is an inverted F antenna, but as the “antenna”, another planar antenna in which a ground plane and an antenna electrode are arranged substantially in parallel can be used. By using a planar antenna, the thickness of the antenna 3 can be reduced, and thus the electronic timepiece 100 can be reduced in thickness. As another planar antenna that receives GPS satellite signals, a GPS satellite transmits satellite signals with right-handed circular polarization, so use a microstrip antenna (patch antenna) with excellent circular polarization characteristics. Can do.
Moreover, although the short circuit part 34 was located in the location corresponding to 12:00 among the side surfaces of the dielectric material 32, the position of the short circuit part 34 is not limited to this. Further, the circuit board 22 described above may include a booster circuit.
Moreover, in this embodiment, although the solar cell 5 has overlapped with the whole antenna pattern 33 in planar view, the solar cell 5 may overlap with only a part of antenna pattern 33 in planar view.

Second Embodiment
Next, a second embodiment of the present invention will be described. FIG. 5 is a plan view showing a solar cell and an antenna pattern included in the electronic timepiece according to the second embodiment.

  The present embodiment is the same as the first embodiment described above except that the configuration of the solar cell is different. In the following description, the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted. In FIG. 5, the same reference numerals are given to the same configurations as those in the above-described embodiment.

  5A includes a first power generation unit 51A, a second power generation unit 54, a first non-power generation unit 521, a second non-power generation unit 522, and a plurality of wirings 55. In FIG. 5, the first non-power generation unit 521 and the second non-power generation unit 522 are provided with dot patterns.

  The first power generation unit 51A has the same configuration as the power generation unit 51 in the first embodiment. That is, the first power generation unit 51A includes a plurality of solar cells 511. The size of the first power generation unit 51A in plan view is smaller than the size of the antenna pattern 33 in plan view, and the outer periphery 302 of the antenna pattern 33 is larger than the outer periphery 503 of the first power generation unit 51A in plan view. Is also located on the outside.

  The first non-power generation unit 521 surrounds the first power generation unit 51A in plan view, and has the same configuration as the non-power generation unit 52 in the first embodiment.

  The second power generation unit 54 is a part that contributes to the power generation of the solar cell 5. The second power generation unit 54 surrounds the first non-power generation unit 521 in plan view, and is located between the first non-power generation unit 521 and the second non-power generation unit 522 in plan view. The second power generation unit 54 has a plurality of solar cells 541. In the figure, the number of solar cells 541 is eight. Note that the second power generation unit 54 is divided by a plurality of dividing lines 502. The plurality of solar cells 541 are connected in series together with the plurality of solar cells 511. In addition, the solar cell 541 is formed, for example, by laminating a resin base material, a metal electrode, a semiconductor layer, a transparent electrode, and a protective layer in this order from the antenna pattern 33 side. The semiconductor layer is formed so that the p-type semiconductor and the n-type semiconductor sandwich the i-type semiconductor.

The second non-power generation unit 522 is a portion that does not contribute to the power generation of the solar cell 5A. The second non-power generation unit 522 surrounds the second power generation unit 54 in plan view. Similarly to the first non-power generation unit 521, the second non-power generation unit 522 does not have an electrode and can transmit radio waves received by the antenna 3. Similarly to the first non-power generation unit 521, the second non-power generation unit 522 is formed, for example, by laminating a resin base material, a semiconductor layer, and a protective layer in this order from the antenna pattern 33 side.
Further, a planar distance A between the outer periphery 302 of the antenna pattern 33 and the outer periphery 503 of the first power generation unit 51A, and a separation distance B in the planar direction between the outer periphery 302 of the antenna pattern 33 and the inner periphery of the second power generation unit 54. May be set as appropriate so as to reduce the influence on the performance of the antenna 3. Specifically, for example, the separation distance A is about 0.5 mm, and the separation distance B is about 1.0 mm.

  The plurality of wirings 55 are bridge portions that connect the first power generation unit 51 </ b> A and the second power generation unit 54, respectively. Specifically, one solar cell 511 and one adjacent solar cell 541 are connected and electrically connected.

  A part of the electrode 531 </ b> A is disposed inside the outer periphery of the second power generation unit 54.

  In the present embodiment, as described above, the “power generation unit” is the first power generation unit 51A located inside the outer periphery 302 of the antenna pattern 33 in plan view. Furthermore, the solar cell 5A includes a second power generation unit 54 located outside the antenna pattern 33 in plan view. The first power generation unit 51 </ b> A and the second power generation unit 54 are connected by a wiring 55.

  In this embodiment, since it has the 1st electric power generation part 51A and the 2nd electric power generation part 54, compared with the case where it does not have the 2nd electric power generation part 54, there are many parts which contribute to the electric power generation of 5 A of solar cells. Thereby, the power generation performance of the solar cell 5A can be enhanced. Further, in the plan view, the first power generation unit 51A is positioned inside the outer periphery 302 of the antenna pattern 33 and the second power generation unit 54 is positioned outside the antenna pattern 33. It does not overlap with the power generation unit 51A and the second power generation unit 54. Thereby, the fall of the performance of the antenna 3 can be suppressed.

  Further, since there is no metal layer that crosses the outer periphery 302 of the antenna pattern 33 in plan view other than the wiring 55, it is possible to reduce the deterioration of the performance of the antenna 3 due to the outer periphery 302 of the antenna pattern 33 being shielded by the metal layer.

Further, by reducing the number of solar cells 511 and solar cells 541, the number of wirings 55 can be easily reduced. By reducing the number of wirings 55, the influence on the performance of the antenna 3 can be further reduced. Therefore, the circuit board 22 may include a booster circuit.
Even when the numbers of the solar cells 511 and the solar cells 541 are reduced, the circuit board 22 includes a booster circuit, so that energy can be efficiently extracted from the solar battery 5A. For example, if the number of solar cells 511 and solar cells 541 is increased from 8 to 4 and boosted twice, the number of wirings 55 can be halved while preventing energy loss due to the solar battery 5A.

  According to the second embodiment as described above, it is possible to suppress a decrease in the power generation performance of the solar cell 5A and to suppress a decrease in the performance of the antenna 3.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 6 is a plan view showing a solar cell and an antenna pattern included in the electronic timepiece according to the third embodiment. FIG. 7 is a partially enlarged cross-sectional view of an electronic timepiece according to the third embodiment.

  The present embodiment is the same as the first embodiment described above except that the configuration of the solar cell and the configuration of the holding member are different. In the following description, the third embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted. 6 and 7, the same reference numerals are given to the same configurations as those in the above-described embodiment.

As illustrated in FIG. 6, the solar cell 5 </ b> B includes the power generation unit 51, but does not include the non-power generation unit 52 in the first embodiment. The size of the solar cell 5B in plan view is smaller than the size of the antenna pattern 33 in plan view, and the solar cell 5B is included in the antenna pattern 33 in plan view. Therefore, the outer periphery 504B of the solar cell 5B, that is, the outer periphery of the power generation unit 51 is located on the inner side of the outer periphery 302 of the antenna pattern 33 in plan view.
Further, the electrode 531B is provided inside the outer periphery of the power generation unit 51 without providing the connection portion 532 as in the first embodiment.

  As shown in FIG. 7, the holding member 42 </ b> B that holds the solar cell 5 </ b> B has a portion 421 that is positioned between the solar cell 5 </ b> B and the antenna 3. The holding member 42B is preferably made of various resin materials so as to reduce or prevent blocking of signals received by the antenna 3.

  In the present embodiment, as described above, since the solar cell 5B is included in the antenna pattern 33 in plan view, the solar cell 5B is not provided on the antenna pattern 33. Therefore, the influence on the performance of the antenna 3 by the solar cell 5B can be reduced or prevented.

  According to the third embodiment as described above, it is possible to suppress a decrease in the power generation performance of the solar cell 5B and to suppress a decrease in the performance of the antenna 3.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described. FIG. 8 is a plan view showing a solar cell included in the electronic timepiece according to the fourth embodiment.

  The present embodiment is the same as the third embodiment described above except that the configuration of the solar cell is different. In the following description, the fourth embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted. In FIG. 8, the same reference numerals are given to the same configurations as those in the above-described embodiment.

  A solar cell 5 </ b> C illustrated in FIG. 8 includes a power generation unit 51 and a protrusion 56 that protrudes from the power generation unit 51. The protruding portion 56 is a portion that does not contribute to the power generation of the solar cell 5. The protrusion part 56 consists of a resin-made base material and a protective layer, for example.

  The protruding portion 56 is provided with a plurality of electrodes 531C. The electrode 531C is connected to the power generation unit 51 by a connection unit 532C. Since there is no metal layer that crosses the outer periphery 302 of the antenna pattern 33 in plan view other than the connection portion 532C, it is possible to minimize the deterioration of the performance of the antenna 3 due to the outer periphery 302 of the antenna pattern 33 being shielded by the metal layer. .

  The electrode 531 </ b> C is located outside the antenna pattern 33 and outside the short-circuit portion 34 in plan view. Since the electrode 531C is positioned outside the short-circuit portion 34 in this manner, it is possible to reduce the possibility that the performance of the antenna 3 is deteriorated due to the current flowing through the lead terminal connecting the electrode 531C and the circuit board 22.

  Also in the present embodiment, as in the third embodiment, the outer periphery 504C of the solar cell 5C, that is, the outer periphery of the power generation unit 51 is located inside the outer periphery 302 of the antenna pattern 33 in plan view.

  According to the fourth embodiment as described above, it is possible to suppress a decrease in the power generation performance of the solar cell 5C and to suppress a decrease in the performance of the antenna 3.

  As mentioned above, although the electronic timepiece of the present invention has been described based on the illustrated embodiments, the present invention is not limited thereto. In addition, the configuration of each part of the present invention can be replaced with any configuration that exhibits the same function as that of the above-described embodiment, and any configuration can be added.

In the embodiment described above, the “antenna” is described as an example of a GPS antenna having a function of receiving GPS satellite signals, but the “antenna” is not limited to the GPS antenna as long as it has a radiation electrode. For example, an antenna that receives satellite signals from other location information satellites such as Galileo (EU), GLONASS (Russia), Hokuto (China), and satellite signals from geostationary and quasi-zenith satellites such as SBAS. Also good. Further, an antenna that receives near field radio such as Bluetooth (registered trademark) may be used.
The non-power generation unit 52 is formed by laminating a base material, a semiconductor layer, and a protective layer, but the semiconductor layer may not be laminated, for example, it is formed only of a resin base material. Also good.

  DESCRIPTION OF SYMBOLS 100 ... Electronic timepiece, 25 ... Pointer axis | shaft, 6 ... Dial plate, 3 ... Antenna, 31 ... Antenna plate (ground electrode), 33 ... Antenna pattern (radiation electrode), 5 ... Solar cell, 51 ... Power generation part, 302 ... Outer periphery , 51A ... 1st power generation part, 54 ... 2nd power generation part, 511 ... Solar panel.

Claims (9)

A pointer shaft;
A light-transmitting dial plate through which the pointer shaft passes;
An antenna having a radiation electrode through which the pointer shaft passes;
A solar cell disposed between the dial and the radiation electrode and through which the pointer shaft passes,
The solar cell includes a power generation unit that overlaps the radiation electrode in a plan view viewed from the thickness direction of the dial, and converts light into electrical energy.
A part of the outer periphery of the radiation electrode is located outside the power generation unit in the plan view.   The electronic timepiece according to claim 1, wherein an entire outer periphery of the radiation electrode is located outside the power generation unit in the plan view. The power generation unit is a first power generation unit located inside the outer periphery of the radiation electrode in the plan view,
The solar cell has a second power generation unit located outside the radiation electrode in the plan view,
The electronic timepiece according to claim 1, wherein the first power generation unit and the second power generation unit are connected by wiring. The power generation unit includes a plurality of solar cells,
The electronic timepiece according to claim 1, further comprising a booster circuit that boosts a voltage generated by the power generation unit.   5. The electronic timepiece according to claim 1, wherein the antenna is an inverted F antenna having a ground electrode that is separated from the radiation electrode, and a short-circuit portion that short-circuits the radiation electrode and the ground electrode. 6. . With a circuit board,
The electronic timepiece according to claim 5, wherein an electrode for connecting the circuit board and the solar cell is provided outside the short-circuit portion in the plan view.   The electronic timepiece according to claim 1, wherein the antenna is a planar antenna. An annular date wheel,
The electronic timepiece according to claim 1, wherein the electronic timepiece is provided with the radiation electrode and having a date indicator holder that holds the date indicator. The electronic timepiece according to claim 8, wherein the date dial holder has an opening for visually recognizing a part of the date dial.

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