JP5157299B2 - Clock and equipment - Google Patents

Description

  The present invention relates to a countermeasure against static electricity in a timepiece and a device including a solar cell.

In recent years, solar cell mounted electronic timepieces that are driven by electric power generated by a solar cell panel and are freed from complicated battery replacement have been developed. In such an electronic timepiece, when the outer case of the watch is made of resin and the back cover is made of metal, the electrostatic discharge current from the back cover side flows to the solar cell panel via the circuit board inside the outer case. As a result, the electrodes sandwiching the thin film silicon layer may be short-circuited to destroy the photovoltaic cell. In a solar cell panel, a plurality of photovoltaic cells are usually connected in series. If even one photovoltaic cell is destroyed (short-circuited), the generated voltage of the entire solar cell panel is lowered.
Since the static electricity is not discharged on the cover glass side, there is no possibility that the photovoltaic cell is short-circuited by the static electricity. Further, when the outer case is made of metal, a discharge current mainly flows through the outer case and does not flow inside the outer case, so that there is practically sufficient electrostatic resistance.

  Here, it is known that a transparent electrode and an exterior case in a solar cell panel are conducted through a conduction spring (Patent Document 1). According to Patent Document 1, before static electricity is applied to a part of the photovoltaic cell by air discharge, it flows to the transparent electrode via the conduction spring and comes out to the outer case. Such an electrostatic bypass effect protects the solar cell panel from electrostatic shock.

JP 2002-107469 A (paragraph “0029”)

However, in the configuration as in Patent Document 1, since the exterior case must be a conductor, it is not possible to employ a non-conductive resin exterior case.
In addition, since a conductive spring that interposes the solar cell panel and the outer case is required, the component cost is increased, the downsizing of the watch is hindered, and the assembly is also difficult.

  An object of the present invention is to provide a timepiece and a device that are provided with a non-conductive exterior case and that can realize countermeasures against static electricity with a simple configuration.

The timepiece of the present invention includes an exterior case formed of a non-conductive material, a metal back cover provided in the exterior case, a circuit board accommodated in the exterior case, and the circuit board in the exterior case. A solar cell having a metal base, and the circuit board is electrically connected to the positive and negative terminals of the solar cell, respectively. And a negative conducting member, and one of the positive conducting member and the minus conducting member is electrically connected to the base material, and the back cover includes the circuit board and the one conducting member. It is characterized by being electrically connected to the substrate via

According to this invention, the electric charge discharged from the back cover side passes through the back cover and the circuit board, and passes through either one of the positive conductive member and the negative conductive member to the metal base material of the solar cell. Diffused. That is, since the electric charge discharged from the back cover side is diffused to the base material before being applied to the photovoltaic cell of the solar cell, a short circuit in the photovoltaic cell can be prevented.
According to the present invention, the electrostatic breakdown voltage can be improved by a single solar cell. That is, as described above, charges are diffused in the solar cell base material itself, so that it is possible to take measures against static electricity without adding other members to the solar cell. For this reason, there are no parts costs or assembly costs for countermeasures against static electricity, and the assembly can be performed easily.
In addition, since a spring member or the like that conducts the solar cell and the exterior case or the like is not necessary, downsizing of the timepiece is not hindered.
Furthermore, since the addition of other members to the solar cell is unnecessary and the structure of the outer case is not limited, the present invention can be applied to various timepiece models in general.
In addition, the base material of a solar cell means the member in which the semiconductor layer of a photovoltaic cell, an electrode, etc. are provided.

Here, the conducting modes of the plus and minus conducting members in the present invention are roughly classified into two types. That is, the first mode in which the positive conducting member is conducted to the substrate and the minus conducting member is not conducted to the substrate, and the plus conducting member is not conducted to the substrate and the minus conducting There are two types, the second mode in which the member is electrically connected to the substrate.
That is, when a photovoltaic cell provided with a plus terminal or a photovoltaic cell in the vicinity thereof is short-circuited when an electrostatic withstand voltage test or the like is performed, the first mode is selected, while a minus terminal is provided. When the photovoltaic cell or the photovoltaic cell in the vicinity thereof is short-circuited, it is preferable to select the second mode.

In the timepiece of the present invention, it is preferable that any one of the conducting members conducted to the base material is conducted to the plus terminal of the solar cell.
According to this invention, it is possible to prevent a short circuit of a photovoltaic cell provided with a plus terminal or a photovoltaic cell in the vicinity thereof among a plurality of photovoltaic cells of a solar cell.

In the timepiece of the present invention, it is preferable that any one of the conducting members conducted to the base material is conducted to the minus terminal of the solar cell.
According to the present invention, it is possible to prevent a photovoltaic cell provided with a minus terminal among a plurality of photovoltaic cells included in a solar cell or a photovoltaic cell in the vicinity thereof.

  In the timepiece of the present invention, each of the positive and negative terminals of the solar cell includes a terminal body provided on the circuit board side of the base material, the terminal body and the base material through the base material. A through hole that conducts between the opposite side of the circuit board and an insulating member that is interposed between the terminal main body and the base material to insulate the terminal main body from the base material. The terminal main body of the terminal conducted to a member is in contact with the base material and an insulating terminal portion provided in an end portion of the through hole on the circuit board side in a state insulated from the base material by the insulating member It is preferable that the contact terminal part to be included.

In this invention, since the contact terminal portion of the terminal body of the terminal that is conducted to one of the plus conduction member and the minus conduction member is in contact with the base material, the one conduction to the terminal body When the member is conducted, the one conducting member is conducted to the base material. According to the present invention, unlike a normal terminal structure in which the terminal main body and the base material are insulated by the insulating member, only a part of the terminal main body (contact terminal portion) is brought into contact with the base material. It is possible to implement countermeasures against static electricity in solar cells without taking this measure.
Here, the insulated terminal portion and the contact terminal portion may be integrated or separated.

  In the timepiece of the present invention, one terminal of the solar cell that is conducted to the one conducting member is provided on the circuit board side of the base material, and a terminal body that contacts the base material, and the base material. A through hole that penetrates and connects the terminal body and the side opposite to the circuit board of the base, and the other terminal of the solar cell is provided on the circuit board side of the base These terminals are interposed between the terminal body and the base material, a terminal body, a through hole that penetrates the base material and connects the terminal main body and the base material opposite to the circuit board. It is preferable to have an insulating member that insulates the main body and the base material.

  In this invention, since the terminal body of the terminal that is conducted to one of the positive conducting member and the minus conducting member is in contact with the base material, the one conducting member is conducted to the terminal body. As a result, the one conducting member is conducted to the base material. According to the present invention, unlike the normal terminal structure in which the terminal body and the base material are insulated by the insulating member, the terminal body is simply brought into contact with the base material without taking any other measure, Can take measures against static electricity of the battery.

The timepiece of the present invention includes an exterior case formed of a non-conductive material, a metal back cover provided in the exterior case, a circuit board accommodated in the exterior case, and the circuit board in the exterior case. A solar cell having a metal base, and the circuit board is electrically connected to the positive and negative terminals of the solar cell, respectively. And the circuit board pattern in which any one of the positive conducting member and the minus conducting member is provided has another conducting member conducted to the base material. The back cover is electrically connected to the base material through the circuit board and the other conductive member .

According to the present invention, substantially the same as the above-described invention, the electric charge discharged from the back cover side passes through the back cover and the circuit board, and is the same as one of the positive conductive member and the negative conductive member. Since it is diffused to the metal base material of the solar cell through another conductive member provided in the pattern on the circuit board, a countermeasure against static electricity can be realized with a simple configuration.
Although other conducting members are provided in the present invention, since the countermeasure against static electricity is realized without the solar cell and the exterior case etc. being conducted, substantially the same effect as described above can be obtained.

  Here, in each of the aforementioned timepieces, stainless steel can be suitably used as the base material. Thereby, the intensity | strength and corrosion resistance of a solar cell are fully securable.

An apparatus of the present invention includes an exterior case formed of a non-conductive material, a metal lid member provided in the exterior case, a circuit board accommodated in the exterior case, and a circuit board in the exterior case. A solar cell having a metal base provided on the opposite side of the lid member, and the circuit board is connected to a positive terminal and a negative terminal of the solar cell, respectively. A conductive member, and either the positive conductive member or the negative conductive member is electrically connected to the base material, and the lid member is interposed between the circuit board and the one conductive member. It is electrically connected to the base material.

According to the present invention, in substantially the same manner as in the timepiece described above, the electric charge discharged from the lid member side passes through the lid member and the circuit board, and passes through the conductive member of either the positive conducting member or the negative conducting member. Since it is diffused in the metal base material of the battery, it is possible to realize a countermeasure against static electricity with a single solar cell. In this way, static electricity is diffused in the solar cell base material itself, so that it is possible to take measures against static electricity without adding other members to the solar cell. For this reason, there are no parts costs or assembly costs for countermeasures against static electricity, and assembly can be performed easily.
In addition, since a spring member or the like that conducts the solar cell and the outer case or the like is not necessary, downsizing of the device is not hindered.
Furthermore, since the addition of other members to the solar cell is unnecessary and the structure of the outer case is not limited, the present invention can be applied to various devices.

  According to the present invention described above, in a configuration including a non-conductive exterior case, it is possible to prevent the photovoltaic cell of the solar battery panel from being short-circuited by static electricity with a simple configuration.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, components similar to those already described are denoted by the same reference numerals, and description thereof is omitted or simplified.
[First Embodiment]
The present embodiment corresponds to the first aspect described above (a configuration in which the positive conducting member is conducted to the base material and the minus conducting member is not conducted to the base material).
FIG. 1 shows the appearance of a digital display electronic timepiece 1 according to the present embodiment. FIG. 2 is a side sectional view of the timepiece 1. The watch 1 includes a plastic outer case 2, a cover glass 3 (FIG. 2), a solar cell panel (solar panel) 4, a digital quartz movement 5 (FIG. 2), and a stainless steel back cover 6 (FIG. 2). The timepiece 1 is provided with a plurality of operation buttons 23.

  As shown in FIG. 2, the movement 5 includes a display panel 51 such as a liquid crystal panel, an organic EL panel, and an electrophoresis panel, a circuit board 52, and a coin-type secondary battery 53 that stores electric power generated by the solar battery panel 4. And a battery storage portion 54 for storing the battery. The battery storage portion 54 is provided with a spring 541 that holds the battery 53. The spring 541 connects the positive electrode 531 of the battery 53 to the back cover 6.

The solar cell panel 4 is formed in a rounded rectangular shape as shown in FIG. 1, and is provided on the side opposite to the back cover 6 side of the movement 5 in the outer case 2 as shown in FIG. . The display area of the display panel 51 is housed inside the annular solar cell panel 4.
Moreover, the solar cell panel 4 is arrange | positioned at the support part 21 formed in the exterior case 2, and the annular member 40 is arrange | positioned in the outer peripheral part of the solar cell panel 4, as shown in FIG. The annular member 40 is disposed along the opening 22 of the exterior case 2. By inserting the cover glass 3 from the opening 22 toward the annular member 40, the solar cell panel 4 is fixed between the annular member 40 and the support portion 21.

FIG. 3 is a plan view of the solar cell panel 4 as seen from the light receiving surface side. The solar battery panel 4 has five photovoltaic cells 4A to 4E. These photovoltaic cells 4 </ b> A to 4 </ b> E are connected in series in each connection pattern 49. In addition, on the back surface of the solar battery panel 4, a positive terminal 401 is provided in the photovoltaic cell 4E, and a minus terminal 402 is provided in the photovoltaic cell 4A.
The plus terminal 401 and the minus terminal 402 are provided in a line symmetry substantially on the left and right of the solar cell panel 4 and substantially along the diagonal line of the solar cell panel 4.

A conductive spring (metallic coil spring) 521 shown in FIG. 2 is provided in the plastic case 55 of the movement 5, and is conducted to a pattern (not shown) corresponding to the plus terminal 401 of the solar cell panel 4 formed on the circuit board 52.
In addition, a conduction spring provided on a minus terminal (not shown) on the circuit board 52 is brought into contact with the minus terminal 402. This conduction spring is also provided in the case 55 of the movement 5. In FIG. 1, a conduction spring 521 that abuts on the plus terminal 401 and a conduction spring 522 that abuts on the minus terminal 402 are indicated by broken lines.

[Positive terminal structure]
FIG. 4 shows the plus terminal 401 viewed from the back side of the solar cell panel 4. FIG. 5 is a cross-sectional view taken along line VV ′ of FIG.
As shown in FIG. 5, the solar cell panel 4 includes a thin plate-like base material 41 formed of stainless steel and a power generation unit 43 provided on the base glass 41 on the cover glass 3 side.

  The power generation unit 43 includes an insulating layer 431, a metal electrode (minus electrode) 432, an amorphous silicon semiconductor layer 433, a transparent electrode (plus electrode) 434, which are sequentially stacked on the surface of the base 41 on the cover glass 3 side, A protective film 435.

The positive terminal 401 includes a terminal body 421 formed of a conductive paint on the surface of the base material 41 opposite to the power generation unit 43, a through hole 422 that penetrates the base material 41, and the terminal body 421 and the base material 41. And an insulating layer 423 as an insulating member interposed therebetween.
The through hole 422 is electrically connected to the terminal body 421 and the transparent electrode 434. An insulating portion 422A is provided around the through hole 422.
The insulating layer 423 and the terminal body 421 are respectively applied to the base material 41 in the order of the insulating layer 423 and the terminal body 421.

  As shown in FIGS. 4 and 5, the terminal main body 421 is provided larger in plan than the insulating layer 423, and is in partial contact with the base material 41. That is, the terminal main body 421 includes an insulating terminal portion 421A provided at an end portion of the through hole 422 in a state insulated from the base material 41 by the insulating layer 423, and a contact terminal portion 421B that contacts the base material 41. . Thereby, in this embodiment, countermeasures against static electricity are taken for the positive terminal.

[Negative terminal structure]
FIG. 6 shows the minus terminal 402 viewed from the back side of the solar cell panel 4. 7 is a cross-sectional view taken along the line VII-VII ′ of FIG.

The negative terminal 402 includes a terminal body 425 formed of a conductive paint, a through hole 426 that penetrates the base material 41, and an insulating layer 427 as an insulating member interposed between the terminal body 421 and the base material 41. doing.
The through hole 426 electrically connects the terminal body 425 and the metal electrode 432.
As shown in FIG. 6, the terminal body 425 is applied in a region where the insulating layer 427 is applied to the base material 41, and is insulated from the base material 41.

FIG. 8 is a schematic diagram showing a state in which the timepiece 1 is set in the electrostatic withstand voltage test apparatus. In FIG. 8, 61 is an insulating film included in the test apparatus, and 62 is a conductor (ground plane) included in the test apparatus.
The test is performed by discharging high-voltage static electricity from the back cover 6 side of the timepiece 1 set in this way. In FIG. 8, illustration of the battery 53, the spring 541 (FIG. 2), etc. arranged between the back cover 6 and the circuit board 52 is omitted (the same applies to FIGS. 9 and 12 to 14).

  Here, FIG. 9 shows a test example with a configuration without a countermeasure against static electricity as a comparative example with the electrostatic test of the present embodiment. The plus terminal 409 in FIG. 9 is configured in the same manner as the minus terminal 402 (FIG. 7) of the present embodiment.

In the configuration of FIG. 9 as a comparative example, the intrusion route of static electricity into the watch is as follows. This intrusion route is shown by a broken line in FIG.
1. 1. Discharge to back cover 6 2. To the VDD on the circuit board 52 through the spring 541 connecting the positive electrode 531 of the battery 53 (FIG. 2) and the back cover 6. 3. To the pattern (not shown) on the circuit board 52 corresponding to the positive terminal 401 of the solar cell panel 4 through the circuit on the circuit board 52. Conduction spring 521
5. Terminal body 421 of solar cell panel 4
6). Through hole 422
7). Transparent electrode 434
8). Semiconductor layer 433
9. Metal electrode 432
Thus, when the discharge current from the back cover 6 side flows into the through hole 422, the transparent electrode 434 and the metal electrode 432 of the photovoltaic cell 4E directly connected to the through hole 422 are short-circuited, and the solar panel 4 The photovoltaic cell 4E may be destroyed.

  On the other hand, in the test example of the present embodiment in FIG. Although the path to the conduction spring 521 is the same, since the conduction spring 521 that is in contact with the terminal body 421 is conducted to the base material 41 by the contact terminal portion 421B, electric charges are transferred from the conduction spring 521 to the base material 41. Diffused. For this reason, short circuit of the photovoltaic cell 4E directly connected to the through hole 422 of the plus terminal 401 is prevented. The electrostatic test of the present embodiment has confirmed that the electrostatic withstand voltage is about twice that of the configuration of FIG. That is, a sufficient electrostatic withstand voltage can be ensured.

According to the above embodiment, the following effects can be obtained.
(1) Since the electric charge discharged from the back cover 6 side is diffused to the metal base 41 of the solar cell panel 4 through the one conduction spring 521 and the terminal body 421, the electrostatic withstand voltage is improved by the solar cell panel 4 alone. Can be achieved. For this reason, there are no parts costs or assembly costs for countermeasures against static electricity, and assembly can be performed easily.
Further, since a spring member or the like that conducts the solar cell panel 4 and the exterior case 2 or the like is not necessary, the timepiece 1 is not hindered in size.
Furthermore, since it is not necessary to add other members to the solar cell panel 4 and the structure of the exterior case 2 is not limited, the solar cell panel 4 can be generally applied to various timepiece models.

(2) Since the plus conduction spring 521 is conducted to the base material 41, it is possible to prevent a short circuit of the photovoltaic cell 4E provided with the through hole 422 of the plus terminal 401 or the photovoltaic cell 4D in the vicinity thereof.

(3) Unlike the terminal structure of the minus terminal 402, the contact terminal portion 421 </ b> B that is a part of the plus terminal main body 421 is intentionally brought into contact with the base material 41. That is, the countermeasure against static electricity of the solar cell panel 4 can be easily implemented by merely providing an insulating layer 423 that is provided larger than the terminal body 421 in order to insulate the terminal body 421 and the base material 41 from each other. it can.

(4) Since the terminal body 421 is formed of a conductive paint, the terminal of the solar cell can be thinned. The conductive paint may be any material that contains conductive particles such as carbon, gold, silver, copper, and nickel together with a medium.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment corresponds to the above-described second aspect (a configuration in which the positive conducting member is not conducted to the substrate and the minus conducting member is conducted to the substrate).
In the solar cell panel 7 shown in the present embodiment, a countermeasure against static electricity is taken for the negative terminal, contrary to the first embodiment.

[Positive terminal structure]
FIG. 10 is a cross-sectional view of the solar cell panel 7 at the position of the plus terminal 701. The terminal body 425 is applied within a range where the insulating layer 427 is applied to the base material 41, and is insulated from the base material 41 by the insulating layer 427.

[Negative terminal structure]
FIG. 11 is a cross-sectional view of the solar cell panel 7 at the position of the negative terminal 702. The terminal body 421 includes an insulating terminal part 421A and a contact terminal part 421B.

FIG. 12 is a schematic diagram showing a state in which a timepiece is set in the electrostatic withstand voltage test apparatus. A test is performed by discharging high-voltage static electricity from the back cover 6 side of the watch set in this way. An intrusion route of static electricity into the watch is shown by a broken line in FIG.
In the present embodiment, since the conduction spring 522 that is in contact with the terminal main body 421 is conducted to the base material 41 by the contact terminal portion 421B, electric charges are diffused from the conduction spring 522 to the base material 41. For this reason, a short circuit of the photovoltaic cell 4A directly connected to the through hole 426 of the minus terminal 702 is prevented in advance.
Thus, since the photovoltaic cell of the solar cell panel 7 is protected, the electrostatic withstand voltage can be approximately doubled compared to the case without countermeasures against static electricity.

According to this embodiment, the same effect as that of the first embodiment can be obtained.
In this embodiment, since the negative conducting spring 522 is conducted to the base material 41, a short circuit such as the photovoltaic cell 4A in which the through hole 426 of the minus terminal 702 is provided or the photovoltaic cell 4B in the vicinity thereof is shorted. Can be prevented.

[Third Embodiment]
FIG. 13 shows a third embodiment of the present invention. The plus terminal 801 of the solar cell panel 8 in this embodiment includes a terminal body 821, a through hole 422, and an insulating layer 427.
Here, the terminal main body 821 includes an insulating terminal portion 821A that is insulated from the base material 41 by the insulating layer 427, and a contact terminal portion 821B that contacts the base material 41.
Insulated terminal portion 821A is formed of conductive paint P and copper foil F, and contact terminal portion 821B is formed of copper foil F. In this embodiment, the copper foil F is arrange | positioned ranging over the insulated terminal part 821A and the contact terminal part 821B.
In addition to the copper foil F, a metal foil such as an aluminum foil, a conductive sheet member, or the like can be used for the contact terminal portion 821B.

Also in this embodiment, a test is performed by discharging high-voltage static electricity from the back cover 6 side of the watch. An intrusion route of static electricity into the watch is shown by a broken line in FIG.
In the present embodiment, since the conduction spring 521 that is in contact with the terminal body 821 is conducted to the base material 41 by the contact terminal portion 821B, the charge is diffused from the conduction spring 521 to the base material 41. For this reason, short circuit of the photovoltaic cell 4E directly connected to the through hole 422 of the plus terminal 801 is prevented in advance.
Thus, since the photovoltaic cell of the solar cell panel 8 is protected, the electrostatic withstand voltage can be approximately doubled as compared with the case without countermeasures against static electricity.
According to this embodiment, the same effect as that of the first embodiment can be obtained.

[Fourth Embodiment]
FIG. 14 shows a fourth embodiment of the present invention. The solar cell panel 9 in this embodiment has a conduction spring 920 as another conduction spring that comes into contact with the base material 41.
The conduction spring 920 is provided together with the conduction spring 521 in a pattern 524 corresponding to the plus terminal 901 of the solar cell panel 9 formed on the circuit board 52.
Also in this embodiment, a test is performed by discharging high-voltage static electricity from the back cover 6 side of the watch. An intrusion route of static electricity is shown by a broken line in FIG.
In this embodiment, since the conduction spring 920 is conducted to the base material 41, the electric charge is diffused from the conduction spring 920 to the base material 41. For this reason, short circuit of the photovoltaic cell 4E directly connected to the through hole 422 of the plus terminal 901 is prevented in advance.
Thus, since the photovoltaic cell of the solar cell panel 9 is protected, the electrostatic withstand voltage can be approximately doubled compared to the case without countermeasures against static electricity.
According to this embodiment, the same effect as that of the first embodiment can be obtained.

[Modification of the present invention]
In addition, this invention is not limited to the said embodiment, The improvement in the range which can achieve the objective of this invention, a deformation | transformation, etc. are included in this invention.
For example, the terminals of the solar cells of the first to third embodiments have the insulating layer 423 and the insulating layer 427 interposed between the terminal main body and the base material. These insulating layers can be eliminated for the terminals of the solar cell that are conducted to the terminals. That is, the insulating layer is not interposed between the terminal main body of the terminal and the base material, and the terminal main body is brought into contact with the base material. Even if it does in this way, the effect similar to 1st-3rd embodiment is acquired, and an insulating material can be saved.

The member which comprises the terminal main body of a solar cell is not restricted to the electroconductive paint shown in 1st Embodiment, 2nd Embodiment, etc. The terminal body of the solar cell may be composed of a foil member such as a copper foil or an aluminum foil.
Moreover, the structure of the through-hole which the terminal of a solar cell has is not specifically limited as long as it penetrates a base material and conducts the terminal main body and the opposite side to the side in which the terminal main body of the base material was provided. The through hole and the terminal body may be integrated.
The configuration of the conductive member provided on the circuit board shown in each of the above embodiments is not limited to a metal coil spring, and may be, for example, a metal screw, a steel wire, or the like.

Moreover, in 3rd Embodiment, although the contact terminal part 821B which contacts a base material was formed with copper foil, not only this but a contact terminal part may be formed with a wire, a lead wire, etc.
Furthermore, in the fourth embodiment, the two conduction springs share the conduction to the terminals of the solar cell and the conduction to the base material of the solar cell. As an application example, for example, a bifurcated shape is used. It is also conceivable that any one branch of the conducting member is brought into contact with the terminal and the other branch is brought into contact with the substrate.
In short, the present invention suffices if any one of the conducting members provided on the circuit board and corresponding to the positive and negative terminals of the solar cell is conducted to the base material. For example, the present invention includes a configuration in which a conductive spring having a diameter larger than that of the conductive spring 521 or the like shown in each of the embodiments is brought into contact with both the terminal of the solar cell and the base material.

In each of the above embodiments, the electronic timepiece 1 as a digital quartz is illustrated, but the present invention is not limited to this, and the present invention can also be applied to an analog quartz that drives a train wheel and displays the time by hands. The present invention is not limited to an electronic timepiece (quartz), and can also be applied to an electronically controlled mechanical timepiece that uses a mainspring as a power source and drives a circuit board with electric power generated by the mainspring to measure time.
Furthermore, the present invention can be applied to various devices including an exterior case, a back cover, a circuit board, and a solar cell, and these devices also have the same effects as the above-described timepiece.
Examples of these devices include information communication devices, digital cameras, and measuring instruments.

Although the best configuration for carrying out the present invention has been specifically described above, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications and improvements can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
The description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which removes a part or all of the limitation is included in the present invention.

The figure which shows the external appearance of the solar cell panel mounted electronic timepiece which concerns on 1st Embodiment of this invention. A side sectional view of the timepiece. The top view which looked at the said solar cell panel from the front side (light-receiving surface side). The elements on larger scale which show the plus terminal seen from the back surface side of the said solar cell panel. VV 'sectional view taken on the line of FIG. The elements on larger scale which show the minus terminal seen from the back surface side of the said solar cell panel. VII-VII 'sectional view taken on the line of FIG. The figure which shows the electrostatic withstand voltage test in the said embodiment. The figure which shows the electrostatic withstand voltage test in a comparative example. Sectional drawing in the position of the plus terminal of the solar cell panel which concerns on 2nd Embodiment of this invention. Sectional drawing in the position of the minus terminal of the said solar cell panel. The figure which shows the electrostatic withstand voltage test in the said embodiment. The figure which shows the electrostatic withstand voltage test in 3rd Embodiment of this invention. The figure which shows the electrostatic withstand voltage test in 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Clock, 2 ... Exterior case, 4 ... Solar cell panel, 6 ... Back cover, 7-9 ... Solar cell panel, 41 ... Base material, 52 ... Circuit Substrate, 401 ... plus terminal, 402 ... minus terminal, 421,425 ... terminal body, 421A ... insulated terminal portion, 421B ... contact terminal portion, 422,426 ... through hole, 423, 427 ... Insulating layer (insulating member), 521 ... Conducting spring (positive conducting member), 522 ... Conducting spring (negative conducting member), 524 ... Pattern, 701 ... Plus Terminal, 702... Minus terminal, 801... Plus terminal, 821... Terminal body, 821A... Insulated terminal part, 821B ... Contact terminal part, 901 ... Plus terminal, 920. Conducting spring (other conducting member).

Claims (8)

An outer case formed of a non-conductive material;
A metal back cover provided on the outer case;
A circuit board housed in the exterior case;
A solar cell provided on the side opposite to the back cover side of the circuit board in the exterior case, and having a metal base;
The circuit board has a positive conducting member and a minus conducting member that are conducted to the positive and negative terminals of the solar cell, respectively.
One of the positive conducting member and the minus conducting member is electrically connected to the base material, and the back cover is electrically connected to the base material via the circuit board and the one conductive member. A watch characterized by The timepiece according to claim 1,
One of the conducting members conducted to the base material is conducted to the plus terminal of the solar cell. The timepiece according to claim 1,
One of the conducting members conducted to the base material is conducted to the minus terminal of the solar cell. The timepiece according to any one of claims 1 to 3,
Each of the positive and negative terminals of the solar cell has a terminal main body provided on the circuit board side of the base material, and the terminal main body and the base material on the opposite side of the circuit board through the base material. And a through hole that conducts, and an insulating member that is interposed between the terminal body and the base material to insulate the terminal body and the base material,
The terminal main body of the terminal that is electrically connected to the one conductive member is provided with an insulating terminal portion that is provided at an end portion of the through hole on the circuit board side in a state of being insulated from the base material by the insulating member; And a contact terminal portion that contacts the base material. The timepiece according to any one of claims 1 to 3,
One terminal of the solar cell that is conducted to the one conducting member is provided on the circuit board side of the base material, a terminal main body that contacts the base material, and the terminal main body that penetrates the base material And a through hole that conducts between the substrate and the opposite side of the circuit board,
The other terminal of the solar cell is electrically connected to a terminal body provided on the circuit board side of the base material and the terminal body and the side of the base material opposite to the circuit board through the base material. A timepiece comprising: a through hole; and an insulating member interposed between the terminal body and the base material to insulate the terminal body and the base material. An outer case formed of a non-conductive material;
A metal back cover provided on the outer case;
A circuit board housed in the exterior case;
A solar cell provided on the side opposite to the back cover side of the circuit board in the exterior case, and having a metal base;
The circuit board has a positive conducting member and a minus conducting member that are conducted to the positive and negative terminals of the solar cell, respectively.
The circuit board pattern in which one of the positive conducting member and the minus conducting member is provided is provided with another conducting member that is conducted to the base material, and the back cover is formed by the circuit. A timepiece characterized by being electrically connected to the base material via a substrate and the other conductive member . The timepiece according to any one of claims 1 to 6,
The timepiece characterized in that the base material is made of stainless steel. An outer case formed of a non-conductive material;
A metal lid member provided in the outer case;
A circuit board housed in the exterior case;
A solar cell provided on the side opposite to the lid member of the circuit board in the exterior case, and having a metal base,
The circuit board has a positive conducting member and a minus conducting member that are conducted to the positive and negative terminals of the solar cell, respectively.
One of the positive conducting member and the minus conducting member is electrically connected to the base material, and the lid member is electrically connected to the base material via the circuit board and the one conductive member. Equipment characterized by being.

Images