JP2016092255A - Solar cell module and electronic watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module requiring no thermo compression bonding, and an electronic watch.SOLUTION: A solar cell module includes: solar cells 31, 32 including cell connection parts 318, 328, respectively, each having a connection terminal formed on a surface thereof; a dial receiving ring 60 supporting the solar cells 31, 32; and a wiring board 33 including a flexible film base material with a conduction part and electrodes 522, 523 formed on the rear face of the conduction part. The dial receiving ring 60 is located on a surface side of the cell connection parts 318, 328, and includes a pressing part 612 overlapping the cell connection parts 318, 328 in plan view, and the conduction part is held between the cell connection parts 318, 328 and the pressing part 612, so that each connection terminal is electrically connected to each of the electrodes 522, 523.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a solar cell module including a solar cell, and an electronic timepiece.

Conventionally, in a timepiece with a solar cell, a light receiving surface of the solar cell is provided on the back side of the dial, and the movement is arranged on the back side of the solar cell. For this reason, in order to supply the movement with the electric energy generated in the solar cell, the electrode on the front surface side of the solar cell is drawn out to the back surface side of the solar cell using a wiring board or the like (see, for example, Patent Document 1). .
The watch with a solar cell of Patent Document 1 includes an end circuit board, a part of the end circuit board is located on the front side of the solar cell, and another part of the end circuit board is on the back side of the solar cell. positioned. And a part of end circuit board located in the surface side of a solar cell is connected with the electrode of the surface side of a solar cell. Thereby, the electrode of the surface side of a solar cell is pulled out to the back surface side of the solar cell.

Japanese Patent Laid-Open No. 10-239453

By the way, in order to connect a part of the end circuit board and the electrode on the surface side of the solar cell, for example, a conductive adhesive layer is provided between them, and the conductive adhesive layer provides a part of the end circuit board. A method of thermocompression bonding between the electrode and the surface electrode is conceivable.
However, in this method, it is necessary to separately provide a conductive adhesive layer, and a thermocompression bonding process is required.

  The objective of this invention is providing the solar cell module and electronic timepiece which do not require thermocompression bonding.

  The solar cell module of the present invention includes a solar cell including a connection portion having a connection terminal formed on a surface thereof, a support member that supports the solar cell, a flexible base material provided with a conduction portion, And a wiring board provided with an electrode formed on the back surface of the conducting portion, the support member is located on the surface side of the connecting portion, and includes a pressing portion that overlaps the connecting portion in plan view, The conductive portion is sandwiched between the connecting portion and the pressing portion, whereby the connection terminal and the electrode of the conductive portion are electrically connected.

According to the present invention, the connection portion of the wiring board is sandwiched between the connection portion of the solar cell and the pressing portion included in the support member, so that the connection terminal and the electrode of the conduction portion are electrically connected. Is maintained. For this reason, it is not necessary to separately provide a conductive adhesive layer or perform thermocompression bonding.
In addition, when thermocompression bonding is used, the adhesive part may be peeled off due to vibration and impact at the time of dropping or long-term use, but in the present invention, since thermocompression bonding is not used, such a problem occurs. And reliability can be improved.

  In the solar cell module of the present invention, the connection part has elasticity, and the connection part presses the conduction part against the pressing part, so that the conduction part is sandwiched between the connection part and the pressing part. It is preferable.

  According to the present invention, for example, the conductive portion can be clamped between the connecting portion and the pressing portion without separately providing a member for pressing the connecting portion toward the pressing portion.

  In the solar cell module of the present invention, the solar cell includes a battery main body portion and the connection portion extending from an outer peripheral edge of the battery main body portion, and the support member is provided on a back surface side of the battery main body portion. It is preferable that the surface provided with the support part located in contact with the said conduction | electrical_connection part in the said holding | suppressing part is located in the said support part side with respect to the surface of the said battery main-body part.

  In the present invention, the connecting portion has elasticity by extending from the outer peripheral edge of the battery body portion. And since the surface which contact | abuts the conduction | electrical_connection part in a holding | suppressing part is located in the support part side with respect to the surface of a battery main-body part, a connection part is bent by the holding | suppressing part to the support part side. As a result, a reaction force is generated on the connection portion on the side of the pressing portion, and the connection portion can press the conduction portion against the pressing portion by this reaction force.

  The solar cell module of this invention WHEREIN: It is preferable that the said connection part is extended along the outer periphery of the said battery main-body part.

  According to the present invention, since the connection portion extends along the outer peripheral edge of the battery main body portion, for example, the connection portion extends in a direction perpendicular to the outer peripheral edge of the battery main body portion and away from the outer peripheral edge. Compared to the case, the outer shape of the solar cell can be reduced, and the solar cell module can be reduced in size.

  In the solar cell module of the present invention, the solar cell includes a battery main body portion and the connection portion, the support member includes a support portion positioned on the back side of the battery main body portion, and the pressing portion is allowed. The conducting part and the connecting part are pressed against the support part by the pressing part when the holding part is bent toward the connecting part side, and the conducting part is connected to the connecting part and the holding part. It is preferable to be sandwiched between.

The solar cell module is built in, for example, a watch. Then, when the solar cell module is pressed by a member such as an inner frame provided on the timepiece, the surface of the pressing portion is pressed against a receiving portion such as a dial ring or an exterior case of the timepiece. Thereby, the holding | suppressing part bends to the connection part side.
According to this, even if a connection part does not have elasticity, a conduction | electrical_connection part can be clamped with a connection part and a holding | suppressing part.

  In the solar cell module of the present invention, the solar cell includes a battery main body portion and the connection portion, and the support member includes a support portion positioned on a back surface side of the battery main body portion. The substrate includes a substrate body portion located on the back side of the battery body portion, and an electrode formed on the surface of the substrate body portion, a back electrode is formed on the battery body portion, and the support portion Is formed with a protruding pressing portion protruding to the front surface side, and the protruding pressing portion presses the substrate main body portion against the battery main body portion, whereby the electrode of the substrate main body portion and the back electrode are electrically connected. It is preferable.

  According to the present invention, the protruding pressing portion formed in the support portion presses the substrate body portion against the battery body portion, so that the state where the electrode of the substrate body portion and the back electrode are electrically connected is maintained. For this reason, it is not necessary to separately provide a conductive adhesive layer or perform thermocompression bonding.

An electronic timepiece according to the invention includes the above-described solar cell module.
According to the electronic timepiece of the invention, it is not necessary to perform thermocompression bonding as in the invention of the solar cell module.

It is a top view of the electronic timepiece concerning a 1st embodiment of the present invention. It is sectional drawing of the internal structure of the electronic timepiece of the said 1st Embodiment. It is a disassembled perspective view of the solar cell structure of the first embodiment. It is sectional drawing of the solar cell structure of the said 1st Embodiment. It is a top view of the wiring board of the first embodiment. It is a figure explaining the assembly process of the solar cell structure of the said 1st Embodiment. It is the top view which looked at the solar cell structure of the said 1st Embodiment from the front side. It is the top view which looked at the solar cell structure of the said 1st Embodiment from the back side. It is a top view of the solar cell module of the said 1st Embodiment. FIG. 10 is a partially enlarged view of FIG. 9. It is the side view and sectional drawing of the solar cell module of the said 1st Embodiment. It is the top view which looked at the dial receiving ring of the 1st embodiment from the front side. It is the top view which looked at the dial receiving ring of the said 1st Embodiment from the back side. It is the side view and sectional drawing of the dial receiving ring of the said 1st Embodiment. It is a top view of the solar cell structure concerning a 2nd embodiment of the present invention. It is a top view of the wiring board of the second embodiment. It is a top view of the solar cell module of the second embodiment. It is the elements on larger scale of FIG. It is a side view of the solar cell module of the second embodiment. It is the top view which looked at the dial receiving ring of the said 2nd Embodiment from the front side. It is the top view which looked at the dial receiving ring of the said 2nd Embodiment from the back side. It is a side view of the dial receiving ring of the second embodiment. It is a side view of the solar cell module of the said 2nd Embodiment of the state integrated in the timepiece. It is a top view of the solar cell structure concerning a 3rd embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
[Configuration of electronic clock]
FIG. 1 is a plan view of an electronic timepiece 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing the internal structure of the electronic timepiece 1.
As shown in FIG. 1, the electronic timepiece 1 is configured as a so-called solar power generation type analog wristwatch. The electronic timepiece 1 includes a timepiece body 2 and a band 3 having both ends connected to the timepiece body 2.

The watch body 2 has a configuration in which a dial 5 having translucency is accommodated in an exterior case 4 made of metal or synthetic resin. In the exterior case 4, a movement 20 is disposed on the back side of the dial 5 as shown in FIG. 2. Between the movement 20 and the dial 5, a solar cell structure 30 including a solar cell that generates power by incident light is disposed. The movement 20, the solar cell structure 30, and the dial 5 are supported by a dial receiving ring 60 (which constitutes a support member of the present invention) attached to the inner periphery of the outer case 4.
Further, the movement 20 is pushed to the timepiece surface side (the side opposite to the back cover 11) by the middle frame 14 disposed inside the exterior case 4. The middle frame 14 includes an elastic portion 141 that protrudes toward the back side of the watch (the back cover 11 side). The elastic portion 141 is pushed by the back cover 11 to push the movement 20 toward the watch face side. Along with this, the solar cell structure 30 and the dial 5 are also pushed to the watch surface side. Further, since the dial receiving ring 60 is fixed to the movement 20, the dial receiving ring 60 is also pressed to the watch surface side when the movement 20 is pressed to the watch face side by the inner frame 14.
The middle frame 14 may be configured to directly press the dial receiving ring 60. Moreover, it is good also as a structure which provides not the inner frame 14 but the elastic part which presses the movement 20 to the timepiece surface side in the dial receiving ring 60. FIG.
On the front side of the dial plate 5, a ring-shaped dial ring 10 formed along the periphery of the dial plate 5 is disposed. Here, the surface of the dial ring 10 is in contact with the outer case 4, and the outer surface of the dial 5 and the outer surface of the dial receiving ring 60 pressed by the inner frame 14 via the movement 20 are on the rear surface. Is pressed. That is, the dial ring 10 functions as a receiving portion that receives the movement 20, the solar cell structure 30, the dial 5, and the dial receiving ring 60.
Further, the pointer attaching portions 21, 22, and 23 of the fourth wheel, the second wheel, and the hour wheel constituting the movement 20 pass through the center holes of the solar cell structure 30 and the dial 5 and protrude to the front side. The second hand 6, the minute hand 7, and the hour hand 8 are attached to each pointer attaching portion. A circuit block 12 is disposed on the back side of the movement 20.

As shown in FIG. 1, the dial 5 is provided with a date window 5A, and the movement 20 includes a date wheel 24 as a calendar car for displaying a date as calendar information from the date window 5A.
On the outside of the outer case 4 at the 3 o'clock position, there is provided a crown 9 for adjusting the minute hand 7 and the hour hand 8 by manual operation. The front side opening portion of the outer case 4 is closed by the windshield 15, and the back side opening portion is closed by the back cover 11.

The movement 20 is driven by electric power generated by the solar cell structure 30. For this reason, although the detailed illustration is omitted, the movement 20 meshes with a secondary battery that stores electric power from the solar cell structure 30, a stepping motor that is driven by electric power from the secondary battery, and a rotor pinion of the stepping motor. In addition to the fifth wheel, the fourth wheel (second wheel) meshing with the fifth wheel, the third wheel, the second wheel, the sun wheel, the hour wheel, which is decelerated and transmitted from the fourth wheel in order, It includes a time adjustment wheel train including a small iron wheel, a time adjustment mechanism including a crown 9, winding stem, a pinwheel, a crown, a setting lever, a synthetic resin base plate that supports these components, various receiving members, and the like.
Such a movement 20 is fixed to the dial receiving ring 60 via a plurality of locking portions 25 provided on the outer peripheral portion of the main plate.
The circuit block 12 is a drive control circuit block that controls the storage of power generated by the solar cell structure 30 to the secondary battery and the supply of power from the secondary battery to the stepping motor.

  The movement 20 is provided with two insertion holes 26 (only one is shown in FIG. 2) penetrating the front and back. Inside each insertion hole 26, the connection member 13 having conductivity and elasticity is inserted in a compressed state. As the connection member 13 in the present embodiment, a metal compression coil spring is employed, but the connection member 13 is not limited to this, and may be a conductive rubber having conductivity.

The opening on the front side of the insertion hole 26 is covered with the solar cell structure 30, and the opening on the back side is covered with the circuit block 12. The solar cell structure 30 and the circuit block 12 are provided with electrodes at positions corresponding to the respective insertion holes. The reason why the two insertion holes are provided is to correspond to the positive and negative electrodes. The solar cell structure 30 and the electrodes of the circuit block 12 that are in opposing positions through each insertion hole are electrically connected by the connection member 13. At this time, since the connecting member 13 is inserted in a state compressed in the insertion hole, both ends of the connecting member 13 and each electrode are in good contact with each other by the reaction force (biasing force).
In this embodiment, the solar cell structure 30 includes two solar cells 31 and 32 as will be described later. However, the solar cells 31 and 32 are wiring boards described later that the solar cell structure 30 includes. Since there are 33 connected in series, only two connecting members 13 are provided.

[Solar cell structure]
FIG. 3 is an exploded perspective view of the solar cell structure 30 as viewed from the front side.
As shown in FIG. 3, the solar cell structure 30 includes a solar cell 31 and a solar cell 32, a wiring substrate 33 provided on the back side of the solar cells 31 and 32, and a flexible substrate 34.

[Solar cell]
The solar cells 31 and 32 are laminated bodies that generate light by receiving light incident from the front side. The solar cells 31 and 32 have a semicircular shape in a plan view (hereinafter referred to as a battery plan view) viewed from the surface side, and the solar cell 31 and the solar cell 32 are arranged to form a circle. ing.
Further, the solar cell 32 is provided with a hole 301 through which each pointer attaching portion 21, 22, 23 is inserted, and a hole 302 for allowing the date indicator 24 to be visually recognized.

FIG. 4 is a cross-sectional view showing the solar cell structure 30.
The solar cell 31 includes, in order from the back surface side, a SUS substrate (stainless steel plate) 311 (hereinafter also referred to as a back electrode 311), an Al layer (aluminum layer) 312, a ZnO layer (zinc oxide layer) 313, and a power generation layer. 314, an ITO film layer (transparent conductive film layer) 315 (hereinafter also referred to as a surface electrode 315), and a protective film 316 are laminated.

In the present embodiment, the SUS substrate 311 is a conductive substrate that functions as an electrode.
The Al layer 312 is a layer that has irregularities formed on the surface and scatters and reflects light transmitted through the power generation layer 314 out of light incident from the ITO film layer 315 side.
The ZnO layer 313 is a layer that adjusts the refractive index of light between the power generation layer 314 and the Al layer 312.

The power generation layer 314 is, for example, a multi-junction power generation layer having a three-layer structure (triple junction structure) in the present embodiment. The power generation layer 314 includes, in order from the ZnO layer 313 side, a first amorphous silicon germanium layer (a-SiGe layer) 314A, a second amorphous silicon germanium layer 314B, and an amorphous silicon layer (a-Si layer) 314C.
The first amorphous silicon germanium layer 314A and the second amorphous silicon germanium layer 314B are formed by doping germanium into amorphous silicon. The amount of germanium doped in the first amorphous silicon germanium layer 314A and the second amorphous silicon germanium layer 314B is different. The first amorphous silicon germanium layer 314A, the second amorphous silicon germanium layer 314B, and the amorphous silicon layer 314C are set to have different absorption wavelength ranges.

The ITO film layer 315 is a transparent conductive film layer that functions as an electrode.
The protective film 316 is a film that protects the ITO film layer 315.
Similarly, the solar cell 32 also includes a SUS substrate 321 (hereinafter also referred to as a back electrode 321), an Al layer 322, a ZnO layer 323, and a power generation layer 324 (first amorphous silicon germanium layer 324A, second amorphous silicon germanium layer). 324B, amorphous silicon layer 324C), ITO film layer 325 (hereinafter also referred to as surface electrode 325), and protective film 326 are laminated.

Returning to FIG. 3, the solar cell 31 includes a battery body portion 317 having a semicircular shape, and a battery connection portion 318 that extends from the outer peripheral edge of the battery main body portion 317 and curves and extends along the outer peripheral edge. A connecting portion of the solar cell).
The solar cell 32 includes a battery body portion 327 having a semicircular shape, and a battery connection portion 328 that extends from the outer peripheral edge of the battery main body portion 327 and curves and extends along the outer peripheral edge (the connection portion of the solar cell of the present invention). Comprising). Here, the battery connection portions 318 and 328 are formed to be elongated so as to have elasticity.
Further, the tip end portion 318B of the battery connection portion 318 and the tip end portion 328B of the battery connection portion 328 are disposed to face each other across the boundary line between the battery main body portion 317 and the battery main body portion 327.
Further, the protective films 316 and 326 are not provided on the surfaces of the battery connection portions 318 and 328, and the surface electrodes 315 and 325 are exposed. Here, the surface electrodes 315 and 325 formed in the battery connection portions 318 and 328 constitute the connection terminal of the present invention.
Moreover, the solar cell 32 has a protruding portion 327A that protrudes from the center of the edge of the battery main body portion 327 in the direction toward the battery main body portion 317 and has a semicircular shape. The protruding portion 327A is provided with a hole 301 through which each of the above-described pointer attaching portions 21, 22, 23 is inserted. On the other hand, the edge of the battery main body 317 in the direction toward the battery main body 327 is recessed in accordance with the shape of the protrusion 327A.

[Flexible substrate]
The flexible substrate 34 is configured, for example, by laminating a polyester film having a thickness of 50 μm and an adhesive layer having a thickness of 28 μm.
As shown in FIG. 3, the flexible substrate 34 has a substantially circular shape. In addition, the flexible substrate 34 has a notch 341, and on the back surface of the back electrodes 311, 321 so that the holes 301, 302 of the solar cell 32 are positioned in the notch 341 in the battery plan view. It is stuck. Thereby, the solar cell 31 and the solar cell 32 are integrated by the flexible substrate 34. Further, the flexible substrate 34 is arranged so as to overlap with a part of the wiring substrate 33 in the battery plan view (see FIG. 8).

[Wiring board]
FIG. 5 is a plan view of the wiring board 33 as viewed from the front side.
As shown in FIGS. 3 and 5, the wiring board 33 includes a film base 40 (which constitutes the base of the wiring board of the present invention) and conductive layers provided on the front and back surfaces of the film base 40, respectively. . The film substrate 40 is made of a flexible material. For the film substrate 40, for example, a polyester or polyimide film having a thickness of 25 μm is used. For example, a copper foil having a thickness of 12 μm is used for the conductive layer. Note that the surface of the conductive layer may be subjected to gold plating. Such a wiring board is also referred to as a flexible printed board (FPC).

The film base 40 has a main body 41 (which constitutes the substrate main body of the present invention) having an elongated shape. The main body 41 is provided with a hole 411 through which the connecting member 13 is inserted, a hole 412 through which a support part 63 of a dial receiving ring 60 described later is inserted, and holes 413 and 414 through which positioning guide pins are inserted. ing.
Furthermore, the film base 40 includes a base end portion 42 extending from the outer edge along the longitudinal direction of the main body portion 41, a distal end portion 43 continuous from the base end portion 42 in one direction of the longitudinal direction, and a base end portion. 42 and a distal end portion 44 continuous in the opposite direction of the one direction. The base end portion 42 is a pressing portion that is pressed by the push rod 19 in an assembly process described later. Moreover, the front-end | tip parts 43 and 44 comprise the conduction | electrical_connection part of the wiring board of this invention.

  As shown in FIG. 5, an electrode 511 and wirings 512 and 513 are provided on the surface of the film base 40 by a conductive layer. The electrode 511 is located on the main body 41. The wiring 512 extends from the proximal end portion 42 to the distal end portion 43. The wiring 513 extends from the proximal end portion 42 to the distal end portion 44.

Electrodes 521, 522, 523, and wirings 524, 525 are provided on the back surface of the film substrate 40 by conductive layers.
The electrode 521 is located on the main body 41. The electrode 522 is located at the distal end portion 43 and is connected to the surface-side wiring 512 via a through hole provided in the distal end portion 43. The electrode 523 is located at the distal end portion 44 and is connected to the surface-side wiring 513 through a through hole provided in the distal end portion 44.
One end of the wiring 524 is connected to the electrode 521, the other end extends to the base end portion 42, and is connected to the surface-side wiring 512 through a through hole provided in the base end portion 42. The wiring 525 extends from the main body 41 to the base end 42, one end is connected to the surface-side electrode 511 through a through hole provided in the main body 41, and the other end is provided to the base end 42. It is connected to the surface side wiring 513 through the through-hole.

  That is, the electrode 522 on the back surface side of the distal end portion 43 is electrically connected to the electrode 521 on the back surface side of the main body portion 41 via the wiring 512 and the wiring 524. Further, the electrode 523 on the back surface side of the tip end portion 44 is electrically connected to the electrode 511 on the front surface side of the main body portion 41 via the wiring 513 and the wiring 525.

[Assembly method of solar cell structure]
FIG. 6 is a diagram illustrating an assembly process of the solar cell structure 30. 6A to 6C are perspective views of the solar cell structure 30 as viewed from the back side.
As shown in FIG. 6A, first, the wiring substrate 33 is placed on the solar cells 31 and 32 so that the back surfaces of the solar cells 31 and 32 face the surface of the wiring substrate 33. That is, in FIG. 6A, the back surfaces of the solar cells 31 and 32 and the back surface of the wiring substrate 33 face upward.
At this time, the wiring board 33 has a main body portion 41 of the wiring board 33 overlapping the battery main body portions 317 and 327 in a plan view of the battery, and a base end portion 42 and front end portions 43 and 44 of the wiring substrate 33 are battery main body portions. It does not overlap with 317 and 327, and is located outside the battery body 317 and 327.
Further, the wiring board 33 has a base end portion 42 positioned on the boundary line between the battery main body portion 317 and the battery main body portion 327, a tip end portion 43 overlapping with a tip end portion 318 B of the battery connection portion 318, and a tip end portion 44 connected to the battery. Positioning is performed so as to overlap the tip 328B of the portion 328.
Thereafter, the flexible substrate 34 (not shown in FIG. 6) is attached to the back surface of the solar cells 31 and 32 so as to cover a part of the wiring substrate 33, thereby the wiring substrate 33 and the solar cells 31 and 32. And can be fixed.

Next, as shown in FIG. 6 (B), the push rod 19 is used to push the base end portion 42 of the wiring board 33 in the direction from the back surface to the front surface. That is, the base end portion 42 is pushed in from the upper side to the lower side in FIG.
Here, since the proximal end portion 42 and the distal end portions 43 and 44 are flexible, when the proximal end portion 42 is pushed in, the proximal end portion 42 is bent toward the surface side, and the distal end portions 43 and 44 are also bent. Are deformed by being pushed by the back surfaces of the battery connection portions 318 and 328. As a result, the distal end portions 43 and 44 pass through the gap 303 between the battery connection portion 318 and the battery connection portion 328 and come out to the surface side of the solar cells 31 and 32.

When the push-in is released, the shapes of the base end portion 42 and the tip end portions 43 and 44 are restored to the original shape, and as shown in FIG. 6C, the back surfaces of the tip end portions 43 and 44 are connected to the battery connection portion 318, Contact the surface of 328.
The solar cell structure 30 is assembled as described above.

[Wiring structure of solar cell structure]
FIG. 7 is a plan view of the solar cell structure 30 as viewed from the front side. FIG. 8 is a plan view of the solar cell structure 30 as seen from the back side.
The back electrode 321, which is the negative electrode of the solar cell 32, is electrically connected to the circuit block 12 via a connection member 131 (one of the connection members 13 in FIG. 2) that abuts through the hole 411 of the wiring substrate 33. Connected.

  The surface electrode 325 that is the positive electrode of the solar cell 32 is connected to the electrode 523 of the wiring substrate 33 at the tip end portion 328 </ b> B of the battery connection portion 328. The electrode 511 that is electrically connected to the electrode 523 via the wirings 513 and 525 is connected to the back electrode 311 that is the negative electrode of the solar cell 31. Thereby, the positive electrode of the solar cell 32 and the negative electrode of the solar cell 31 are electrically connected.

The surface electrode 315 that is the positive electrode of the solar cell 31 is connected to the electrode 522 of the wiring substrate 33 at the tip portion 318B of the battery connection portion 318. The electrode 521 electrically connected to the electrode 522 via the wirings 512 and 524 is connected to the electrode 521 via a connection member 132 (the other one of the connection members 13 in FIG. The circuit block 12 is electrically connected.
In this way, the positive electrode of the solar cell 31 and the negative electrode of the solar cell 32 are connected to the circuit block 12, and the electric energy generated by the solar cells 31 and 32 is stored in the secondary battery via the circuit block 12. Is done.

[Solar cell module]
The solar cell module includes a dial plate ring 60 and a solar cell structure 30 mounted on the dial plate ring 60. A solar cell module is demonstrated using FIGS. 9-14.
FIG. 9 is a plan view of the solar cell module as seen from the front side. FIG. 10 is a partially enlarged view of FIG. FIG. 11A is a side view of the solar cell module as viewed from the twelve o'clock side of the watch, and FIG. 11B is a cross-sectional view taken along line AA in FIG.
FIG. 12 is a plan view of the dial receiving ring 60 as seen from the front side. FIG. 13 is a plan view of the dial receiving ring 60 as seen from the back side. FIG. 14A is a side view of the dial receiving ring 60 as viewed from the 12 o'clock side of the timepiece, and FIG. 14B is a cross-sectional view taken along line AA of FIG.

The dial receiving ring 60 includes a support portion 610 formed in a ring shape. And the solar cell structure 30 is mounted in the surface side of the support part 610. As shown in FIG.
Protruding portions 621 to 629 that protrude from the surface to the watch surface side are formed on the support portion 610.
The protruding portions 623 to 629 are formed along the outer periphery of the support portion 610, abut against the back surfaces of the battery main body portions 317 and 327, and support the solar cell structure 30. The protruding portion 623 is inserted through the hole 412 of the wiring board 33.
The protrusions 621 and 622 are in contact with the back surfaces of the base ends of the battery connection portions 318 and 328 and support the solar cell structure 30.

The dial receiving ring 60 includes a base end portion 611 that protrudes from the outer periphery of the timepiece 12 o'clock side of the support portion 610 to the timepiece surface side, and the inner peripheral side of the support portion 610 from the side surface on the front end side of the base end portion 611 And a plate-like pressing portion 612 extending in the direction.
The holding portion 612 is formed so that the tip end portions 318B and 328B of the battery connection portions 318 and 328 are located on the back side of the watch, and overlaps the tip end portions 318B and 328B in a plan view of the battery.

Here, the back surface (the surface on the back surface side) of the pressing portion 612 is positioned on the back surface side, that is, on the support portion 610 side with respect to the front surfaces of the battery main body portions 317 and 327 (FIGS. 11A and 11B). B)). For this reason, the battery connection portions 318 and 328 are bent by the pressing portion 612 so that the distal end is positioned on the back side of the watch from the base end. As a result, a reaction force is generated on the timepiece surface side at the tip portions 318B and 328B of the battery connection portions 318 and 328, and the tip portions 318B and 328B of the battery connection portions 318 and 328 are caused by the reaction force of the wiring board 33. The tip portions 43 and 44 are pressed against the back surface of the pressing portion 612. Specifically, the tip portions 318 </ b> B and 328 </ b> B press the portions where the electrodes 522 and 523 are formed on the tip portions 43 and 44 of the wiring substrate 33 against the end portion on the back surface of the pressing portion 612.
In this way, the tip portions 43 and 44 of the wiring board 33 are sandwiched between the tip portions 318B and 328B of the battery connection portions 318 and 328 and the pressing portion 612.
Thereby, the state in which the surface electrodes 315 and 325 formed in the battery connection portions 318 and 328 and the electrodes 522 and 523 of the tip portions 43 and 44 of the wiring board are electrically connected is maintained.

The support portion 610 includes two slits 641 and 642 extending along the outer peripheral direction, and a beam portion 643 formed between the two slits and having elasticity. The beam portion 643 is provided with a protruding pressing portion 644 that protrudes toward the watch surface. The protrusion pressing portion 644 is formed at a position overlapping the electrode 511 of the main body portion 41 of the wiring board 33 in the battery plan view.
Since the front surface of the battery main body 317 is supported by the dial plate 5, the protrusion pressing portion 644 is pressed toward the back of the watch by the back surface of the battery main body 317. For this reason, the beam portion 643 is bent toward the back side of the watch. Accordingly, a reaction force is generated on the beam portion 643 on the timepiece surface side, and the protrusion pressing portion 644 causes a portion of the body portion 41 of the wiring substrate 33 where the electrode 511 is formed to be a battery body portion 317. Against the back of That is, the portion of the main body portion 41 where the electrode 511 is formed is sandwiched between the protruding pressing portion 644 and the battery main body portion 317.
Thereby, the state where the back surface electrode 311 of the battery main body 317 and the electrode 511 of the main body 41 of the wiring board 33 are electrically connected is maintained.

Further, the support portion 610 is formed with grooves 651 and 652 opened to the inner peripheral side. Connection members 131 and 132 are inserted into the grooves 651 and 652.
Further, on the inner peripheral side of the support portion 610, a base plate support portion 601 that supports the locking portion 25 (see FIG. 2) of the base plate of the movement 20 is formed.

[Effects of First Embodiment]
The front end portions 43 and 44 of the wiring board 33 are sandwiched between the battery connection portions 318 and 328 and the holding portion 612, so that the surface electrodes 315 and 325 formed on the battery connection portions 318 and 328 and the front end portion 43 are formed. 44, the electrodes 522, 523 are electrically connected. For this reason, it is not necessary to separately provide a conductive adhesive layer or perform thermocompression bonding. For this reason, costs such as material costs and processing costs can be reduced.
In addition, when thermocompression bonding is used, the adhesive part may be peeled off due to vibration and impact at the time of dropping or long-term use, but since this embodiment does not use thermocompression bonding, such a problem And reliability can be improved. That is, the electrical energy generated by the solar cells 31 and 32 can be reliably stored in the secondary battery.

  Since the battery connection portions 318 and 328 have elasticity and press the tip portions 43 and 44 of the wiring board 33 against the pressing portion 612, for example, a member for pressing the battery connection portions 318 and 328 toward the pressing portion 612 is used. Without providing separately, the front-end | tip parts 43 and 44 of the wiring board 33 can be clamped by the battery connection parts 318 and 328 and the pressing part 612.

  Since the surface of the pressing portion 612 that contacts the tip portions 43 and 44 of the wiring board 33 is located on the support portion 610 side with respect to the surface of the battery main body portions 317 and 327, the battery connecting portions 318 and 328 are pressed. The portion 612 is bent toward the support portion 610 side. As a result, a reaction force is generated on the battery connection portions 318 and 328 on the pressing portion 612 side, and the battery connection portions 318 and 328 press the tip portions 43 and 44 of the wiring board 33 against the pressing portion 612 by this reaction force. it can.

  Since the battery connection portions 318 and 328 extend along the outer peripheral edge of the battery main body portions 317 and 327, for example, the battery connection portions 318 and 328 are orthogonal to the outer peripheral edge of the battery main body portions 317 and 327 and Compared with the case of extending in the direction away from the periphery, the outer shape of the solar cells 31 and 32 can be reduced, and the solar cell module can be downsized.

  The protrusion pressing portion 644 formed on the support portion 610 presses the main body portion 41 of the wiring board 33 against the battery main body portion 317, so that the state where the electrode 511 and the back surface electrode 311 of the main body portion 41 are electrically connected is maintained. Is done. For this reason, it is not necessary to separately provide a conductive adhesive layer or perform thermocompression bonding.

[Second Embodiment]
Next, a second embodiment will be described. In the second embodiment, the configuration of the solar cell module is different from that of the first embodiment. Other configurations are the same as those of the first embodiment. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
FIG. 15: is the top view which looked at 30A of solar cell structures which comprise the solar cell module of 2nd Embodiment from the front side.
The solar cell structure 30A includes a solar cell 31A, a solar cell 32A, a wiring substrate 33A, and a flexible substrate 34.

[Solar cell]
The solar cell 31A includes a battery main body portion 317 and a battery connection portion 319 projecting outward from an end portion in one direction along the boundary line between the solar cell 31A and the solar cell 32A in the battery main body portion 317 (the solar cell of the present invention). The connecting portion is provided.
The solar cell 32A includes a battery main body portion 327 and a battery connection portion 329 protruding from an end portion in the one direction of the battery main body portion 327 (which constitutes the solar cell connection portion of the present invention).
Further, the battery connection portions 319 and 329 are not provided with the protective films 316 and 326, and the surface electrodes 315 and 325 are exposed. Here, the surface electrodes 315 and 325 formed in the battery connection portions 319 and 329 constitute the connection terminal of the present invention.

[Wiring board]
FIG. 16 is a plan view of the wiring board 33A as viewed from the front surface side.
As shown in FIGS. 15 and 16, the wiring board 33 </ b> A has a film base 40 </ b> A and conductive layers respectively provided on the front and back surfaces of the film base 40 </ b> A.

The film base 40A has a main body 41A having an elongated shape. The main body portion 41A is provided with a hole 411 through which the connection member 131 is inserted, similarly to the film substrate 40 of the first embodiment.
Furthermore, 40 A of film base materials have the protrusion part 45 which protruded from the outer edge along the longitudinal direction of 41 A of main-body parts. Here, the protrusion 45 constitutes a conduction part of the wiring board of the present invention.
The film base 40A is provided with a slit 401 formed along the longitudinal direction of the main body 41A at the boundary between the main body 41A and the protrusion 45.

Similar to the film base 40 of the first embodiment, electrodes 511 and wirings 512 and 513 are provided on the surface of the film base 40A by a conductive layer. The electrode 511 is located on the main body 41 </ b> A, and the wires 512 and 513 are located on the protrusion 45.
Similar to the film substrate 40 of the first embodiment, electrodes 521, 522, 523 and wirings 524, 525 are provided on the back surface of the film substrate 40 A using conductive layers.
The electrode 521 is located on the main body 41A. The electrodes 522 and 523 are located on the protrusion 45.

The wiring board 33A is attached to the solar cells 31A and 32A by sliding from the side of the solar cells 31A and 32A so that the battery connection portion 319 and the battery connection portion 329 are inserted through the slit 401.
That is, the main body portion 41A of the wiring board 33A is located on the back side of the battery main body portions 317 and 327, and the protruding portion 45 of the wiring board 33A is located on the front surface side of the battery connecting portions 319 and 329.

[Solar cell module]
The solar cell module according to the second embodiment includes a dial plate receiving ring 60A and a solar cell structure 30A mounted on the dial plate receiving ring 60A. The solar cell module will be described with reference to FIGS.
FIG. 17 is a plan view of the solar cell module as viewed from the front side. FIG. 18 is a partially enlarged view of FIG. FIG. 19 is a side view of the solar cell module as viewed from the 12 o'clock side of the timepiece.
FIG. 20 is a plan view of the dial receiving ring 60A viewed from the front side. FIG. 21 is a plan view of the dial receiving ring 60A as viewed from the back side. FIG. 22 is a side view of the dial receiving ring 60A as viewed from the 12 o'clock side of the timepiece.
19 and 22 show the solar cell module and the dial receiving ring 60A that are not incorporated in the watch.

The dial receiving ring 60A includes a support portion 610 that is the same as that of the first embodiment, base end portions 661 and 662 that protrude from two locations on the outer periphery of the timepiece 12 o'clock side in the support portion 610, and a base end portion A holding portion 663 that extends from the tip of 661 to the tip of the base end portion 662 and has flexibility is provided. Flexibility is a property that allows bending. That is, it does not ask whether it has elasticity.
Here, the back surface (the surface on the watch back surface side) of the pressing portion 663 is separated from the surface of the support portion 610, thereby providing a gap portion 602 (see FIGS. 19 and 22).
The holding portion 663 is formed with a protruding portion 663A protruding to the timepiece front surface side and protruding portions 663B and 663C (see FIGS. 19 and 22) protruding to the timepiece back surface side.

The solar cell structure 30A is mounted on the front surface side of the support portion 610 so that the battery connection portions 319 and 329 and the protruding portion 45 of the wiring board 33A are inserted into the gap portion 602.
That is, the holding portion 663 is formed so that the battery connection portions 319 and 329 are located on the back side of the watch and overlap the battery connection portions 319 and 329 in a plan view of the battery.

Here, when the electronic timepiece is assembled, the movement 20 is pushed by the inner frame 14 toward the surface of the timepiece, so that the holding portion 663 of the dial receiving ring 60A fixed to the movement 20 as shown in FIG. The tip of the protruding portion 663A is pressed against the dial ring 10 as a receiving portion, and the pressing portion 663 bends to the back side. The outer case 4 can also be used as the receiving part.
At this time, the tips of the protrusions 663B and 663C of the pressing part 663 press the protrusion 45 of the wiring board 33A against the surfaces of the battery connection parts 319 and 329. Specifically, the tips of the protrusions 663B and 663C of the pressing part 663 press the portions of the protrusions 45 of the wiring board 33A where the electrodes 522 and 523 are formed against the surfaces of the battery connection parts 319 and 329.
Further, the back surfaces of the battery connection portions 319 and 329 are supported by the support portion 610.
For this reason, the protruding portion 45 of the wiring board 33 </ b> A is sandwiched between the battery connection portions 319 and 329 and the pressing portion 663.
Thereby, the state which the surface electrodes 315 and 325 formed in the battery connection parts 319 and 329 and the electrodes 522 and 523 of the protrusion part 45 of the wiring board 33A are electrically connected is maintained.

[Effects of Second Embodiment]
According to the present embodiment, similarly to the first embodiment, it is not necessary to separately provide a conductive adhesive layer or perform thermocompression bonding, and reliability can be improved.
In addition, since the protruding portion 45 of the wiring board 33A is pressed against the battery connecting portions 319 and 329 by the pressing portion 663, the protruding portion 45 of the wiring substrate 33A can be connected to the battery even if the battery connecting portions 319 and 329 are not elastic. The connection portions 319 and 329 and the pressing portion 663 can be held.

[Third Embodiment]
Next, a third embodiment will be described. In the third embodiment, the configuration of the solar cell structure is different from that of the first embodiment. Other configurations are the same as those of the first embodiment. In addition, about the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
FIG. 24 is a plan view of the solar cell structure 30B of the third embodiment as viewed from the front side.
In the solar cell structure 30 of the first embodiment, the solar cell 31 and the solar cell 32 are integrated by the flexible substrate 34. However, in the solar cell structure 30B of the third embodiment, four batteries are used. One solar cell 35 formed by integrating the portions 31B, 31C, 32B, and 32C is used.

The solar cell 35 is formed by laminating a semiconductor layer such as amorphous silicon on the surface of a SUS substrate to form a pin structure, and forming a surface electrode made of ITO (indium tin oxide) or the like on the surface. is there. In the present embodiment, unlike the first embodiment, the SUS substrate does not have a function as an electrode.
Battery portions 31B, 31C, 32B, and 32C each have a fan shape in a plan view of the battery, and are arranged radially with respect to holes 301 through which pointer attaching portions 21, 22, and 23 are inserted.
That is, in this embodiment, battery part 31B, 31C, 32B, 32C comprises the battery main-body part.
And battery connection part 318C, 328C is extended from the outer periphery of battery part 31B, 32B. In the present embodiment, the battery connection portions 318C and 328C are configured by a SUS substrate and connection terminals 351 and 352 formed on the surface of the SUS substrate. Other configurations of the battery connection portions 318C and 328C are the same as those of the battery connection portions 318 and 328 of the first embodiment.

Further, in the wiring substrate 33B of the third embodiment, no electrode is provided on the surface of the main body portion of the film base 40B, and an electrode 526 connected to the wiring 525 is provided on the back surface of the main body portion.
Further, the wiring board 33B is not provided with a hole through which the guide pin is inserted.
An adhesive layer 36 is provided on the surface of the film substrate 40B. The wiring substrate 33 </ b> B is adhered and fixed to the back surface of the solar cell 35 by the adhesive layer 36.
Other configurations are the same as those of the wiring substrate 33 of the first embodiment.

The battery parts 31B, 31C, 32B, and 32C are connected in series by wiring (not shown) arranged on the front side. The negative electrode of the battery unit 31B is connected to the connection terminal 351 through a wiring (not shown), and the positive electrode of the battery unit 32B is connected to the connection terminal 352 through a wiring (not shown). Accordingly, the connection terminals 351 and 352 function as a negative electrode and a positive electrode of the solar cell 35, respectively.
The connection terminal 351 is electrically connected to the connection member 132 by the wiring board 33B. The connection terminal 352 is electrically connected to the connection member 131 by the wiring board 33B. In this way, the positive and negative electrodes of the solar cell 35 are connected to the circuit block 12, and the electric energy generated by the solar cell 35 is stored in the secondary battery via the circuit block 12.

  Also in the electronic timepiece including the solar cell structure 30B of the third embodiment, the same effect as that of the first embodiment can be obtained.

[Other Embodiments]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

  For example, in each of the above embodiments, the battery connection portion is formed to extend from the outer peripheral edge of the battery main body portion, but the present invention is not limited to this. For example, the battery connection part may be constituted by a part of the battery main body part.

  In the first embodiment, the battery connection portion is curved and extended along the outer peripheral edge of the battery main body portion, but the present invention is not limited to this. For example, the battery connection part may extend in a direction orthogonal to the outer peripheral edge of the battery main body part and away from the outer peripheral edge.

  In the first embodiment, the solar cell and the wiring substrate are arranged to overlap each other, and the wiring substrate is attached to the solar cell by pushing the base end portion of the wiring substrate with the pushing rod. However, the present invention is limited to this. Not. For example, the wiring substrate may be slid in a bent state from the side of the solar cell and attached to the solar cell.

  In the said 2nd Embodiment, although the back surface of a battery connection part is supported by the support part of a dial receiving ring, this invention is not limited to this. For example, when the battery connection portion is not deformed, the back surface of the battery connection portion may not be supported by the support portion.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 30, 30A, 30B ... Solar cell structure, 31, 31A, 32, 32A, 35 ... Solar cell, 311, 321 ... SUS substrate (back electrode), 315, 325 ... ITO film layer (surface electrode) 317, 327 ... Battery body, 318, 318C, 319, 328, 328C, 329 ... Battery connection, 33, 33A, 33B ... Wiring board, 351, 352 ... Connection terminal, 40, 40A, 40B ... Film base 41, 41A ... main body, 43, 44 ... tip, 45 ... projection, 511, 522, 523 ... electrode, 60, 60A ... dial receiving ring, 610 ... support, 612, 663 ... presser, 644 ... Projection pressing part.

Claims (7)

A solar cell provided with a connection portion having a connection terminal formed on the surface;
A support member for supporting the solar cell;
A substrate having flexibility and a conductive portion; and a wiring board including an electrode formed on the back surface of the conductive portion.
The support member is located on the surface side of the connection portion, and includes a pressing portion that overlaps the connection portion in plan view,
The said connection terminal and the electrode of the said conduction | electrical_connection part are electrically connected by the said conduction | electrical_connection part being clamped by the said connection part and the said holding | suppressing part. The solar cell module characterized by the above-mentioned. The solar cell module according to claim 1, wherein
The connecting portion has elasticity,
The said connection part presses the said conduction | electrical_connection part to the said press part, The said conduction | electrical_connection part is clamped by the said connection part and the said press part. The solar cell module characterized by the above-mentioned. In the solar cell module according to claim 2,
The solar cell includes a battery body portion and the connection portion extending from an outer peripheral edge of the battery body portion, and extending.
The support member includes a support part located on the back side of the battery body part,
The surface which contacts the said conduction | electrical_connection part in the said press part is located in the said support part side with respect to the surface of the said battery main-body part. The solar cell module characterized by the above-mentioned. In the solar cell module according to claim 3,
The connecting portion extends along an outer peripheral edge of the battery main body. The solar cell module according to claim 1, wherein
The solar cell includes a battery body portion and the connection portion,
The support member includes a support part located on the back side of the battery body part,
The pressing portion has flexibility,
When the pressing portion is bent toward the connection portion, the conduction portion and the connection portion are pressed against the support portion by the pressing portion, and the conduction portion is sandwiched between the connection portion and the pressing portion. A solar cell module characterized by. In the solar cell module according to any one of claims 1 to 5,
The solar cell includes a battery body portion and the connection portion,
The support member includes a support part located on the back side of the battery body part,
In the wiring board, the base material includes a substrate body part located on the back side of the battery body part, and an electrode formed on the surface of the substrate body part,
A back electrode is formed on the battery body,
The supporting part is formed with a protruding pressing part protruding to the surface side,
The solar cell module, wherein the protruding pressing portion presses the substrate body portion against the battery body portion, whereby the electrode of the substrate body portion and the back electrode are electrically connected. An electronic timepiece comprising the solar cell module according to any one of claims 1 to 6.

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