JP2010210295A - Electronic wristwatch with solar cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the light receiving efficiency of a solar cell in a watch, in which the solar cell is disposed at a side surface part of the exterior case. <P>SOLUTION: The solar cell is disposed, at a side closer to a viewing side of the watch than to an external operating member so that efficient light reception is attained. The solar cell includes a through-hole or a cutout for allowing the external operation member to pass therethrough, and the solar cell is disposed at the side surface part of the exterior case at the same height as the external operation member so that the solar cell photovoltaic generation area of the solar cell is widened. The solar cell is wrapped around the side-surface section of the exterior case, with the end parts overlapped with each other by a prescribed length, and fixed at a certain location of the external operating member, for example. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a timepiece having a solar power generation system that generates power using light and power storage means for storing electric power generated by the solar power generation system, and an electronic device in which a solar cell is disposed on a side surface portion of an exterior case of a wristwatch. Related to watches.

  Conventionally, many electronic timepieces that have solar cells and use light such as sunlight as a power generation source have been commercialized. In many cases, the solar cell is disposed on the upper surface of the outer case including the indication surface. When the solar cell is disposed on the upper surface of the outer case, the solar cell is entirely or partially hidden by the sleeve of the clothing, and the light is blocked and cannot be received or the light receiving efficiency is lowered. However, even if the upper part of the watch is covered with sleeves, the side surface portion of the exterior case of the wristwatch can receive light, and a technique for solving the above problem is disclosed in Patent Document 1 by disposing the solar cell on the side surface portion of the exterior case of the wristwatch. It is disclosed.

JP-A-53-95671

  However, Patent Document 1 does not disclose a detailed technique for realizing this configuration even though the solar cell is disclosed on the side surface of the outer case. In particular, a specific arrangement structure for increasing the light receiving efficiency is not described. The present invention proposes a specific arrangement structure aimed at increasing the light receiving efficiency in an electronic wristwatch with a solar battery in which the solar battery is arranged on the side surface of the outer case.

In order to achieve the above object, the present invention is characterized in that an external operation member is provided on a side surface portion of an exterior case, and a solar cell is disposed on the watch viewing side with respect to the external operation member.
Furthermore, the solar cell has a through hole or a notch for allowing the external operation member to penetrate, and the external operation member passes through the through hole or passes through the notch, so that the solar cell The external operation member is configured to be arranged at the same height on the side surface of the exterior case.

  Further, the length of the long side of the solar cell is set longer than the periphery of the side surface portion of the exterior case, the solar cell is wound around the side surface portion of the exterior case, and the ends of the solar cells are Are overlapped by a predetermined length.

  Furthermore, the overlapping portion of the solar cell is disposed on a side surface portion of the exterior case excluding a portion where the external operation member is disposed.

  Further, the exterior case has a pipe for passing the shaft of the external operation member, and the overlapping portion of the solar cell is disposed at a place where the pipe exists, and the overlapping portion of the solar cell is engaged by the pipe. It is stopped.

  Furthermore, the power extraction electrode of the solar cell is disposed at an end portion, and the overlapping portion is disposed at a time of 4 o'clock to 8 o'clock or 10 o'clock to 2 o'clock.

  Further, the external operation member is arranged at a 6 o'clock position or a 12 o'clock position of the timepiece.

  As described above, the present invention has the following effects.

  (1) In most cases, the wristwatch viewing side is the upper part of the wristwatch when worn or removed. Since the solar cell is arranged on the side of the exterior case closer to the watch viewing side than the external operation member, the solar cell can be easily exposed to light and can be efficiently received.

  (2) Even if the side surface portion of the exterior case has the external operation member, the solar cell is configured to be arranged at the same height, so that the entire side surface portion of the exterior case has a sun. Since the battery photovoltaic power generation region can be arranged, the solar cell photovoltaic power generation region can be widened, and the light receiving efficiency can be increased.

  (3) Since the end portion of the solar cell has an edge portion that does not generate power even if there is light, when both ends of the solar cell end portion overlap each other by a predetermined length, one end of the solar cell end portion is wound inwardly, The solar cell photovoltaic power generation region can be widened, and the light receiving efficiency can be increased.

  (4) The solar cell is often attached with an electrode for power extraction connected to the substrate at the end, and the power extraction electrode is a region where power generation is not performed, and thus is wound inside the solar cell and becomes an overlapping portion. Since the overlapping portion of the solar cell is disposed on the side surface portion of the outer case excluding the portion where the external operation member is disposed, the external operation member and the power extraction electrode are not disposed so as to overlap each other. It becomes simple and the watch movement can be made thinner and smaller in diameter.

  (5) The end of the solar cell is locked by the pipe for passing the shaft of the external operation member of the outer case, so that the end of the solar cell can be shared by a part of the outer case, and the structure is It can be simplified.

  (6) The end portion of the solar cell has an edge portion that does not generate power even when there is light, and the end portion of the solar cell becomes an overlapping portion. By arranging the overlapping part at the 4 o'clock to 8 o'clock position or the 10 o'clock to 2 o'clock position of the watch, it is arranged to overlap the outer case tip ring part and the band where the light on the side of the outer case is difficult to hit, and efficiency Good light reception can be realized.

  (7) Even at a position where the external operation member is located, it is difficult for light to hit the side surface of the exterior case. By arranging the external operation member at the 6 o'clock position or the 12 o'clock position of the timepiece, it is arranged so as to overlap with the outer case tip ring portion or the band, which is similarly difficult to receive light, and efficient light reception can be realized.

1 is a perspective view of an electronic wristwatch with a solar cell according to a first embodiment of the present invention. It is a top view of the completion solar cell by a 1st embodiment of the present invention. 1 is a plan view of a solar cell according to a first embodiment of the present invention. It is a top view of the electrode for electric power extraction by 1st Embodiment of this invention. It is a perspective view which shows the state which assembled the completed solar cell by 1st Embodiment of this invention. It is a fragmentary sectional view of the electronic wristwatch with a solar cell by a 1st embodiment of the present invention. It is the fragmentary top view seen from the back cover side of the electronic wristwatch with a solar cell by 1st Embodiment of this invention. It is a fragmentary sectional view which shows the solar cell and board | substrate connection part of the wristwatch with a solar cell by 1st Embodiment of this invention. It is a perspective view which shows the state assembled in order to integrate the completion solar cell with a through-hole by 2nd Embodiment of this invention into an electronic timepiece. It is a perspective view which shows the state assembled in order to integrate the notch completion completed solar cell by 2nd Embodiment of this invention into an electronic timepiece. It is a fragmentary sectional view of the solar cell-powered electronic wristwatch in which the solar cell and the external operation member according to the second embodiment of the present invention are arranged at the same height. It is a top view of the completion solar cell with both ends notch by 3rd Embodiment of this invention. It is a fragmentary perspective view which shows the state which incorporated the solar cell with a both-ends notch by 3rd Embodiment of this invention in the electronic wristwatch with a solar cell. It is the fragmentary top view seen from the back cover side in which the solar cell overlap part by 4th Embodiment of this invention shows a 6 o'clock position. It is the partial top view seen from the back cover side in which the solar cell overlap part by 4th Embodiment of this invention shows a 12:00 position. It is a top view of the electronic wristwatch with a solar cell in which the external operation member by 5th Embodiment of this invention is a 12:00 position. It is a top view of the electronic wristwatch with a solar cell in which the external operation member by 5th Embodiment of this invention is a 6 o'clock position.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
1st Example is an Example which implement | achieves the improvement of a light reception efficiency by arrange | positioning the solar cell arrange | positioned at the exterior case side surface to the windshield side in cross section rather than external operation members, such as a crown. .

FIG. 1 is a perspective view of a first embodiment of the present invention. An electronic timepiece 1 having a ring glass 2 ′ on the side surface 2 of the outer case is shown. In addition, a crown 3 of an external operation member for correcting time and date is arranged on the side of the exterior case. Further, a front ring 4 is disposed around 6 o'clock and 12 o'clock of the outer case, and a band 5 is connected to the front ring 4. The ring glass 2 'has a function of passing light from the side to the inside.
The shape of the front ring 4 is devised so that light is applied as much as possible to the solar cells at 6 o'clock and 12 o'clock where the front ring 4 is arranged.

  FIG. 2 is a plan view of the completed solar cell 6. The state which integrated the solar cell 7 and the electrode 8 for electric power extraction by thermocompression bonding is shown.

FIG. 3 is a plan view of the solar cell 7. It is a solar cell on an elongated band in which an amorphous silicon layer is formed on a base substrate 9 made of PET film, has a flexible photovoltaic power generation region 7a that generates power by receiving light, and positive and negative at the end of the same surface The electrodes 7b and 7c are arranged side by side.
The outer diameter shape of the solar cell 7 is an elongated strip shape having a length of about 123 mm, a width of 3 mm, and a thickness of about 0.15 mm, and the photovoltaic region 7a has a length of about 114 mm and a width of 2 mm. The entire outer periphery of the photovoltaic region 7a has an edge portion 7d that does not generate electricity even when light of about 0.5 mm in width is applied. This is because individual sheets are formed from a sheet in which a large number of solar cells are formed on a large-sized PET film. This is the cutting allowance when cutting and separating into solar cells.

FIG. 4 is a plan view of the power extraction electrode 8. The power extraction electrode 8 has positive and negative electrodes 8c and 8d formed on a flexible printed board having a total thickness of about 0.1 mm. An anisotropic conductive adhesive is applied to the joint surface 8 a between the power extraction electrode 8 and the solar cell 7, and the positions of the positive and negative electrodes 7 c and 7 b of the solar cell 7 and the junction of the power extraction electrode 8 are combined. The electrodes 8e and 8f are aligned and then joined by thermocompression bonding to form the completed solar cell 6.

FIG. 5 is a perspective view of the completed solar cell 6 showing a state in which the same completed solar cell 6 as that in FIG. 2 is incorporated in the electronic timepiece 1. The completed solar cell 6 is wound and incorporated in a ring shape so that the photovoltaic region 7a faces outward.
The photovoltaic region 7 a cannot be disposed in the positive and negative electrodes 7 b and 7 c of the solar cell 7. Therefore, the winding method of the completed solar cell 6 is preferably wound in a ring shape with the power extraction electrode 8 inward in order to increase the power generation area. Note that the ends of the solar cells 7 are overlapped by an overlap portion 10 having a predetermined length.

  FIG. 6 is a cross-sectional view of the electronic wristwatch with solar cell of the present invention. Reference numeral 11 denotes an exterior case, and a ring-shaped ring glass 2 ′ is fitted on the outermost side of the exterior case 11. Reference numeral 12 denotes a decorative ring, which is formed of a non-conductive light transmitting member and is incorporated inside the ring glass 2 '. The completed solar cell 6 is incorporated on the windshield 18 side of the winding stem 13 while being wound around the side surface of the exterior case 11 inside the decorative ring 12. Reference numeral 14 denotes an insulating sheet, which is incorporated on the windshield 18 side of the winding stem 13 while being wound around the side surface of the exterior case 11 inside the completed solar cell 6. The insulating sheet 14 is inserted to prevent an electrical short circuit between the completed solar cell 6 and the outer case 11.

  Reference numeral 16 denotes a solar cell support frame, which is incorporated between the outer case 11 and the decorative ring 12 on the back cover 15 side from the completed solar cell 6 and the insulating sheet 14. It is held so as not to be closer to the back cover 15 side. The winding stem 13 integrated with the crown 3 of the external operation member with an adhesive or the like passes through the through hole of the outer case 11 and the ring glass 2 ′ and the cutout of the decorative ring 12 from the side surface of the outer case 11. It is inserted into the movement 17.

  External light 19 is applied to the completed solar cell 6 through the ring glass 2 ′ and the decorative ring 12 from the upper windshield 18 side in FIG. 6. Therefore, the power generation efficiency can be further improved by arranging the completed solar cell 6 on the windshield 18 side above the winding stem 13 as in this embodiment.

  By the way, the photovoltaic region 7a of the above-described solar cell 7 is dark brown, and its appearance is not so beautiful. In order to hide the color, it is necessary to surround with a beautifully colored decorative ring 12, while the solar cell 7 needs to receive light to generate electricity. Therefore, the decorative ring 12 is made of a light-transmitting material having a property of transmitting a certain amount of light. In this embodiment, the decorative ring 12 is provided. However, the ring glass 2 ′ may be colored to eliminate the decorative ring 12, and the ring glass 2 ′ may directly support the completed solar cell 6. good.

FIG. 7 is a partial plan view of an electronic wristwatch with a solar cell. The crown 3 of the external operation member integrated with the winding stem 13 is arranged at the 3 o'clock position outside the ring glass 2 ′. The long side of the solar cell 7 of the completed solar cell 6 set longer than the periphery of the side surface portion of the outer case 11 is wound around the side surface portion of the outer case 11.
In addition, the battery extraction electrode 8 of the completed solar cell 6 arranged to be overlapped at the 6 o'clock position is pressed by the holding plate 21, and the battery extraction electrode 8, the holding plate 21 and the substrate 22 are attached to the timepiece movement 17 by the screw 20. Fixed.

As for the overlapping portion 10 of the completed solar cell 6, it is not preferable to place it at the 3 o'clock position where the crown 3 of the external operation member is arranged because the structure becomes complicated, the watch movement 17 becomes thicker, and the diameter becomes larger. . Therefore, it is desirable that the overlapping portion 10 is disposed at a position other than the 3 o'clock position. In this embodiment, the overlapping portion 10 is arranged at the 6 o'clock position. The reason why the 6 o'clock position is selected as a position other than 3 o'clock will be described in detail in the fourth embodiment together with other embodiments, and is omitted here.

  FIG. 8 is a partial sectional view showing the connection between the completed solar cell 6 and the substrate 22 of the solar cell equipped electronic wristwatch. The battery extraction electrode 8 of the completed solar cell 6 is bent and connected to the substrate 22, and the battery extraction electrode 8, the pressing plate 21, and the substrate 22 are fixed to the timepiece movement 17 with screws 20.

  The first embodiment has the following effects.

(1) It is possible to improve the light receiving efficiency by disposing the solar cell disposed on the side surface of the exterior case on the side of the windshield in a cross section rather than the external operation member such as the crown.

(2) Since the overlapping portion between the end portions of the solar cell is disposed at a place other than the position where the crown as the external operation member is disposed, the overlapping portion between the external operation member and the solar cell does not overlap, and the structure Becomes simple, and the watch movement can be made thinner and smaller in diameter.

[Second Embodiment]
The second embodiment of the present invention will be described below.
In the second embodiment, the solar cell arranged on the side surface of the outer case is arranged at the same height as the external operation member such as the crown, so that the width of the photovoltaic region of the solar cell is increased, and the light receiving efficiency is further improved. This is an embodiment for realizing the improvement.

  FIG. 9 is a perspective view of the completed solar cell 23 with a through hole showing a state where the completed solar cell 23 with a through hole is assembled to be assembled into the electronic timepiece 1. The photovoltaic region 24a of the solar cell 24 with a through hole has a length of about 114 mm and a width of 4.4 mm, which is about twice as wide as the photovoltaic region 7a of the completed solar cell 6 of the first embodiment. . In addition to the portion where the power extraction electrode 25 of the through-hole solar cell 24 is disposed, a through-hole 24b through which the winding stem passes is formed.

  FIG. 10 is a perspective view of the notched completed solar cell 26 showing a state in which the notched completed solar cell 26 is assembled to be assembled into the electronic timepiece 1. The notched completed solar cell 26 has a notch 26b through which the winding stem passes in the portion of the through hole 24b of the completed solar cell 23 with a through hole. The photovoltaic region 26a of the notched completed solar cell 26 has the same width as the photovoltaic region 24a of the completed solar cell 23 with a through hole.

  Which of the through hole and the notch is adopted depends on the cross-sectional position of the external operation member, the plane position, the size of the completed solar cell (especially the width), the material of the base material of the completed solar cell, etc. What is necessary is just to select suitably.

  FIG. 11 is a cross-sectional view of an electronic wristwatch with solar cell in a state in which a completed solar cell 23 with a through hole is incorporated in the electronic wristwatch with solar cell. The winding stem 13 integrated with the crown 3 of the external operation member is completed from the side surface of the exterior case 11 with a through hole in the exterior case 11 and the ring glass 2 ′, a cutout in the decorative ring 12, and a through hole. The through-hole 24b of the solar cell 23 and the through-hole of the insulating sheet 27 are passed through and inserted into the timepiece movement 17, so that the completed solar cell 23 with the through-hole is made the same height as the crown 3 of the external operation member. Can be placed.

  Further, the notched complete solar cell 26 can also be arranged in the same manner as in FIG. 11 by passing the winding stem 13 through the notch 26b portion through which the winding stem passes.

The second embodiment has the following effects.
(3) It is possible to arrange the solar cell and the external operation member at the same height by providing a hole or notch through which an external operation member such as a crown passes through the solar cell disposed on the side surface of the outer case. It becomes. As a result, the width of the photovoltaic region of the solar cell can be increased, and the light receiving efficiency can be further improved.

[Third embodiment]
The third embodiment of the present invention will be described below.
In the third embodiment, the solar cell end portion of the solar cell overlapping portion arranged on the side surface of the outer case is locked by a pipe passing through the shaft of an external operation member such as a crown, so that the solar cell end portion is engaged. This is an embodiment in which the stopper is also used as a part of the outer case to simplify the structure.

  FIG. 12 is a plan view of the completed solar cell 28 with notches at both ends according to the present invention. Both ends of the solar cell have notches 28a and 28b that are locked to pipes through which the winding stem passes.

  FIG. 13 is a partial perspective view showing a state in which the completed solar cell 28 with both ends notched according to the present invention is incorporated in an electronic wristwatch with a solar cell. The cutouts 28a and 28b at both ends of the solar cell completed solar cell 28 are both engaged with and incorporated into a pipe 29 through which the winding stem passes.

The third embodiment has the following effects.
(4) The solar cell end portion of the solar cell overlapping portion disposed on the side surface of the outer case is locked with a pipe passing through the shaft of an external operation member such as a crown, thereby locking the solar cell end portion. It becomes possible to share a part of the exterior case, and the structure can be simplified.

[Fourth embodiment]
The fourth embodiment, which is another form of the first embodiment of the present invention, will be described below.
In the fourth embodiment, the overlapping portion of the end portions of the solar cells arranged in the outer case is arranged at the 4 o'clock to 8 o'clock position, or 10 o'clock to 2 o'clock position. This is an embodiment that realizes efficient light reception by arranging the overlapping portion so as to overlap with the outer case tip ring portion or the band where the light on the side surface portion of the watch case is difficult to hit.

  FIG. 14 shows the back cover of an electronic wristwatch with a solar cell, showing a state in which the completed solar cell 6 of the first embodiment of the present invention is incorporated into the electronic wristwatch with a solar cell at the 6 o'clock position. It is the fragmentary top view seen from the side. With respect to the crown 3 at the 3 o'clock position, the overlapping portion 10 of the completed solar cell 6 is arranged at the 4 o'clock to 8 o'clock position in the range 30 of about 120 ° with the 6 o'clock position as the center.

  FIG. 15 shows a back cover of an electronic wristwatch with a solar cell, showing a state in which the completed solar cell 6 according to the first embodiment of the present invention is incorporated into the electronic wristwatch with a solar cell at the 12 o'clock position. It is the fragmentary top view seen from the side. With respect to the crown 3 at the 3 o'clock position, the overlapping portion 10 of the completed solar cell 6 is arranged at the 2 o'clock to 10 o'clock position in a range 31 of about 120 ° with the 12 o'clock position as the center.

  In the above-mentioned 4 o'clock to 8 o'clock position and 2 o'clock to 10 o'clock position, in an ordinary timepiece, an outer case tip ring part and a band are arranged. As can be seen from FIG. 1, FIG. 16 and FIG. , 26a) is not a good measure in terms of improving the power generation efficiency. On the contrary, the overlapping portion 10 cannot contribute to power generation even if it is disposed at a position where light other than the 4 o'clock to 8 o'clock position or the 2 o'clock to 10 o'clock position is sufficiently exposed. Therefore, the overlapping portion 10 is arranged at the 4 o'clock to 8 o'clock position or the 2 o'clock to 10 o'clock position to improve power generation efficiency.

  In addition, the completed solar cell 23 with a through-hole and the completed solar cell 26 with a notch of 2nd Example can also carry out the same arrangement | positioning as FIG. 14, FIG.

The fourth embodiment has the following effects.
(5) It is possible to improve the power generation efficiency by arranging overlapping portions that do not contribute to power generation at the 4 o'clock to 8 o'clock position or the 2 o'clock to 10 o'clock position where the outer case tip ring or band is arranged.

[Fifth embodiment]
The fifth embodiment, which is another form of the first embodiment of the present invention, will be described below.
In the fifth embodiment, the position of the external operation member such as the crown arranged on the side surface of the outer case is overlapped with the watch case tip ring portion and the band arranged at the 12 o'clock and 6 o'clock positions, so that the light is transmitted. This is an embodiment that realizes efficient light reception by being arranged so as to overlap the outer case tip ring portion and the band that are difficult to hit.

  FIG. 16 is a plan view of an electronic wristwatch with a solar cell in which the crown 3 as an external operation member is arranged at 12:00 in the electronic wristwatch with a solar cell according to the first embodiment of the present invention. The crown 3 is arranged at the 12 o'clock position.

  FIG. 17 is a plan view of an electronic wristwatch with a solar cell in which a crown as an external operation member is arranged at 6 o'clock in the electronic wristwatch with a solar cell according to the first embodiment of the present invention. The crown 3 is arranged at the 6 o'clock position.

  Also, the solar cell-equipped electronic wrist watch of the completed solar cell 23 with through holes, the notched completed solar cell 26 of the second embodiment, and the completed solar cell 28 with both ends notched of the third embodiment is also shown in FIGS. The same arrangement can be used.

  As described in the fourth embodiment, the 4 o'clock to 8 o'clock position and the 2 o'clock to 10 o'clock position where the outer case tip ring portion and the band are arranged are portions that do not easily contribute to power generation. Furthermore, in the timepiece of the present invention, an external operation member such as a crown also becomes an obstacle to power generation. In particular, recently, large crowns have become popular due to operability and design, and the effect is even greater.

  By disposing an external operation member such as a crown at the 6 o'clock or 12 o'clock position, it is possible to minimize power generation inhibition by the external operation member. This embodiment can be applied to all the first to fourth embodiments described above, but the combined use with the third embodiment is more effective. When used in combination with the fourth embodiment, the overlapping portion is disposed on the opposite side of the crown (for example, when the crown is at the 12 o'clock position, the overlapping portion is at the 6 o'clock position).

The fifth embodiment has the following effects.
(6) By disposing an external operation member such as a crown at the 4 o'clock to 8 o'clock position or 2 o'clock to 10 o'clock position, it is possible to minimize power generation obstruction by the external operation member and further improve the power generation efficiency. Become.

DESCRIPTION OF SYMBOLS 1 Electronic type clock 2 Exterior case side surface 2 'Ring glass 3 Crown 4 Front ring 5 Band 6 Complete solar cell 7 Solar cell 7a Photoelectric generation region 7b Positive / negative electrode 7c Positive / negative electrode 7d Edge which does not generate power 8 Power extraction electrode 8c Positive / negative electrode 8d Positive / negative electrode 8a Bonding surface 8e Bonding electrode 8f Bonding electrode
DESCRIPTION OF SYMBOLS 9 Base substrate made from PET film 10 Overlap part 11 Exterior case 12 Cosmetic ring 13 Winding stem 14 Insulating sheet 15 Back cover 16 Solar cell support frame 17 Clock movement 18 Windshield 19 External light 20 Screw 21 Holding plate 22 Substrate 23 With through hole Completed solar cell 24 Solar cell with through-hole 24a Photovoltaic region 24b Through-hole through which winding stem passes 25 Power extraction electrode 26 Notched completed solar cell 26a Photovoltaic region 26b Notch through winding stem 27 Insulating sheet 28 Both-end notch Included solar cell 28a Notched latched 28b Notched latched 29 Pipe passing through winding stem 30 Range of about 120 ° centered at 6 o'clock 31 Range of about 120 ° centered at 2 o'clock

Claims (6)

It has a strip-shaped solar cell arranged on the side part of the outer case, and an external operation member,
Having a through hole or notch for penetrating the external operation member into the solar cell,
The external operation member passes through the through hole or passes through the notch,
An electronic wristwatch with a solar cell, wherein the solar cell and the external operation member are arranged at the same height on a side surface of the exterior case. The length of the long side of the solar cell is set longer than the periphery of the side surface portion of the outer case, the solar cell is wound around the side surface portion of the outer case, and
The electronic wristwatch with solar cell according to claim 1, wherein ends of the solar cell overlap each other by a predetermined length. 3. The solar cell-equipped electron according to claim 2, wherein the overlapping portion of the solar cells is configured to be disposed on a side surface portion of the exterior case excluding a portion where the external operation member is disposed. Watches. A pipe for passing the shaft of the external operation member through the outer case;
The overlapping portion of the solar cells is disposed where the pipe exists,
3. The electronic wristwatch with solar cell according to claim 2, wherein an overlapping portion of the solar cell is locked by the pipe. The solar cell power extraction electrode is disposed at the end,
5. The electronic wristwatch with a solar cell according to claim 2, wherein the overlapping portion is arranged at a time of 4 o'clock to 8 o'clock or from 10 o'clock to 2 o'clock. 6. The electronic wristwatch with a solar cell according to claim 1, wherein the external operation member is disposed at a 6 o'clock position or a 12 o'clock position of the timepiece.

Images