JP6327381B2 - Secondary battery unit and solar panel electronic watch - Google Patents

Description

The present invention relates to a secondary battery unit and a solar panel electronic timepiece .

  A watch equipped with a solar battery is equipped with a solar battery in a general analog watch that is the base, the power circuit is changed to one that supports the charging function, and the battery is changed from a primary battery to a secondary battery. A solar cell type analog timepiece is realized (for example, Patent Document 1).

JP-A-5-150055

However, in the case of adopting the structure as described above, the base parts of the movement such as the ground plane are completely shared between a general analog watch and a solar cell type analog watch in order to make the electrode and circuit block of the solar cell conductive. I couldn't.
In other words, when the configuration is such that the electrode of the solar cell and the circuit block are connected, if a primary battery is mounted as a battery, the charging current from the solar battery flows to the primary battery, which may destroy the primary battery. is there. For this reason, in the conventional solar cell type analog timepiece, when the primary battery is mistakenly attached, the solar battery, the circuit block, and the primary battery are generally configured not to conduct.

The present invention has been made in view of the circumstances described above, the movement-based components such as the main plate, common analog clock and solar powered Ru can be used in common between the analog clock battery unit The solution is to provide a solar panel electronic timepiece .

In order to solve the above problems, a secondary battery unit according to the present invention includes a secondary battery, a conductive spring, one terminal connected to the negative electrode of the secondary battery, and the other terminal connected to the spring. And a backflow prevention diode connected to .

The secondary battery unit is provided with a secondary battery, a conductive spring, and a backflow prevention diode. One terminal of the backflow prevention diode is connected to the negative electrode of the secondary battery, and the other terminal of the backflow prevention diode is connected to a conductive spring.
As described above, according to the present invention, the base parts of the movement such as the main plate can be shared between a general primary battery type electronic timepiece and a solar panel type electronic timepiece, and a significant cost reduction is realized. In addition, it becomes a base part for movements such as highly versatile ground plates, which improves production efficiency.

A solar panel type electronic timepiece according to the present invention is a solar panel type electronic timepiece operable by the above-described secondary battery unit, and includes a solar panel and a battery storage unit capable of storing the secondary battery unit or the primary battery. The battery housing portion is provided with a contact portion for connecting the spring and the negative electrode of the solar panel .

In this solar panel type electronic timepiece, when the secondary battery unit having the above-described configuration is stored in the battery storage unit, the conductive spring provided in the secondary battery unit is interposed via the contact unit disposed in the battery storage unit. Is electrically connected to the negative electrode of the solar panel.
According to the present invention, a base part of a movement such as a main plate can be shared between a general primary battery type electronic timepiece and a solar panel type electronic timepiece, and a significant cost reduction is realized. In addition, it becomes a base part for movements such as highly versatile ground plates, which improves production efficiency.

In the solar panel electronic timepiece described above, it is preferable that the secondary battery has the same diameter as the primary battery, and the thickness of the secondary battery is thinner than the thickness of the primary battery . In this case, the primary battery or the secondary battery can be stored in the same battery storage unit.

In the solar panel type electronic timepiece described above, in the state where the primary battery is stored in the battery storage unit, the contact unit is not in contact with the primary battery, and the secondary battery unit is included in the battery storage unit. In the state in which is stored, the contact portion is preferably in contact with the spring .
When the primary battery is stored in the battery storage unit, the primary battery is disconnected from the solar panel, so that charging current flows from the solar panel to the primary battery, thereby preventing problems that may occur in the primary battery. Become. On the other hand, when the secondary battery unit is stored in the battery storage part, the conductive spring provided in the secondary battery unit is electrically connected to the negative electrode of the solar panel through the contact part arranged in the battery storage part. Since it is connected, it becomes possible to charge the secondary battery unit by the solar panel while preventing the backflow of current from the secondary battery unit to the solar panel.

1 is a plan view of an electronic timepiece 100 according to an embodiment of the present invention. 2 is a partial cross-sectional view of the electronic timepiece 100. FIG. 2 is a block diagram showing a circuit configuration of the electronic timepiece 100. FIG. 4 is a partial cross-sectional view of the periphery of a battery housing portion 86 of the electronic timepiece 100. FIG. 6 is a partial cross-sectional view showing a state in which a secondary battery unit 27 is stored in a battery storage unit 86. FIG. FIG. 6 is a perspective view illustrating a storage state of the secondary battery unit 27 of the electronic timepiece 100. 4 is a circuit diagram showing a state in which a secondary battery unit 27 is stored in a battery storage unit 86. FIG. 6 is a partial cross-sectional view showing a state in which a primary battery 50 is stored in a battery storage portion 86. FIG. 4 is a circuit diagram showing a state in which a secondary battery unit 27 is stored in a battery storage unit 86. FIG. 2 is a plan view of a primary battery type electronic timepiece 200. FIG.

  Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, in each figure, the size and scale of each part are appropriately changed from the actual ones. Further, since the embodiments described below are preferable specific examples of the present invention, various technically preferable limitations are attached thereto. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms.

  FIG. 1 is a plan view of a solar electronic timepiece 100 (hereinafter referred to as “electronic timepiece 100”) according to an embodiment of the present invention. As shown in FIG. 1, the electronic timepiece 100 includes an exterior case 80. A disc-shaped dial plate 11 is arranged as a time display portion on the inner peripheral side of the outer case 80 via an annular dial ring 83, and a pointer 13 for displaying time, date, etc. on the dial plate 11. (13a-c) is arranged. The opening on the surface side of the exterior case 80 is closed with a cover glass 84, and the dial plate 11, the hands 13 (13 a to 13 c) and the liquid crystal display panel 14 can be visually recognized through the cover glass 84. It has become. The dial plate 11 can be made of a non-conductive material.

The dial ring 83 has a horizontal annular portion that is in contact with the inner peripheral surface of the outer case 80 on the outer peripheral side, and a mortar-shaped portion whose inner peripheral side is inclined inward.
Further, the electronic timepiece 100 can correct the internal time information by manually operating the crown 16 and the operation buttons 17 and 18 shown in FIG.

  FIG. 2 is a partial cross-sectional view showing the internal structure of the electronic timepiece 100. As shown in FIG. 2, the electronic timepiece 100 has an annular dial ring 83 attached along the inner periphery of the exterior case 80. Of the two openings of the exterior case 80, the opening on the front surface side is closed with a cover glass 84, and the opening on the back surface side is closed with a back cover 85 formed of metal. The metal back cover 85 and the metal outer case 80 are fixed by screw grooves.

Further, the electronic timepiece 100 can store the secondary battery unit 27 including the secondary battery such as a lithium ion battery or the primary battery in the ground plate 31. FIG. 2 shows an example in which the secondary battery unit 27 is accommodated.
The secondary battery unit 27 is charged with electric power generated by a solar panel 87 described later. That is, solar charging is performed. The secondary battery unit 27 includes a backflow prevention diode 28 and a conduction spring 25 (coil spring) as described later (see FIG. 4). The solar panel 87 and the secondary battery unit 27 are electrically connected by the conduction spring 25. The backflow prevention diode 28 and the conduction spring 25 function as a charge control unit that controls charging of the secondary battery. The conduction spring 25 is an example of a conductive elastic member.

  The electronic timepiece 100 includes a light-transmitting dial plate 11, a pointer shaft 12 penetrating the dial plate 11, and a plurality of hands 13 (circling around the pointer shaft 12 to indicate the current time. A second hand 13a, a minute hand 13b and an hour hand 13c), and a driving mechanism 30 for driving the plurality of hands 13 by rotating the pointer shaft 12. The pointer shaft 12 extends in the front and back direction along the central axis of the exterior case 80.

  The dial plate 11 is a circular plate member that constitutes a time display unit that displays the time inside the outer case 80, is formed of a light-transmitting material such as plastic, and has a pointer 13 (13a) between it and the cover glass 84. ˜c) are arranged inside the dial ring 83. A hole through which the pointer shaft 12 passes is formed at the center of the dial 11.

  The drive mechanism 30 is attached to the main plate 31 and includes a step motor and a gear train such as gears. The step motor drives the plurality of hands 13 by rotating the hands 13 through the wheel train. Specifically, the hour hand 13c makes a full turn in 12 hours, the minute hand 13b in 60 minutes, and the second hand 13a in 60 seconds. Further, the base plate 31 to which the drive mechanism 30 is attached is disposed so as to sandwich the dial plate 11 between the dial 13.

  The drive of the drive mechanism 30 is controlled by a display control unit 36 provided on the circuit board 35. The plus potential of the display control unit 36 is connected to the plus terminal of the secondary battery unit 27 via the plus side contact terminal 38 a formed at the lower part of the circuit board 35. Further, the negative potential of the display control unit 36 is connected to the negative terminal of the secondary battery unit 27 via a negative contact terminal 41 of a leaf spring 40 described later.

  The electronic timepiece 100 also includes a solar panel 87 that performs photovoltaic power generation inside the exterior case 80. The solar panel 87 is a circular flat plate in which a plurality of solar cells (photovoltaic elements) that convert light energy into electric energy (electric power) are connected in series. The solar panel 87 is disposed between the dial 11 and the drive mechanism 30 and has pointers. It extends along the cross section of the shaft 12. The solar panel 87 is disposed inside the dial ring 83 in the extending direction.

  FIG. 3 is a block diagram showing a circuit configuration of the electronic timepiece 100. The display control unit 36 includes a positive power supply terminal 36p, a negative power supply terminal 36n, a control unit 70, a drive circuit 74, and a crystal resonator 73. A high potential power supply is supplied to the positive power supply terminal 36p, and a low potential power supply is supplied to the negative power supply terminal 36n. The display control unit 36 operates by power supplied to the positive power supply terminal 36p and the negative power supply terminal 36n. Note that a regulator may be provided in the display control unit 36 so that the voltage supplied to the positive power supply terminal 36p and the negative power supply terminal 36n may be stabilized and supplied to the control unit 70 and the drive circuit 74.

  The control unit 70 includes, for example, an IC and a crystal resonator 73. The control unit 70 controls the driving of all the hands 13 via the drive circuit 74 based on the reference clock signal generated by the crystal unit 73.

  The solar panel 87 includes a negative power supply terminal 87n (one power supply terminal) for outputting a low potential and a positive power supply terminal 87p (the other power supply terminal) for outputting a high potential, and the generated power is supplied to the secondary battery unit 27. Supply.

  The secondary battery unit 27 includes a positive terminal 27p that is electrically connected to the positive power terminal 87p of the solar panel 87, a charge control terminal 27c that is electrically connected to the negative power terminal 87n of the solar panel 87, and display control. And a negative terminal 27n electrically connected to the negative power supply terminal 36n of the portion 36. A secondary battery is provided between the plus terminal 27p and the minus terminal 27n. The electric power generated by the solar panel 87 is charged in the secondary battery. When the solar panel 87 cannot generate power due to indoor use or the influence of the weather, the secondary battery unit 27 supplies power to the display control unit 36.

FIG. 4 is a cross-sectional view illustrating details of the battery storage unit 86 that stores the secondary battery unit 27 or the primary battery. The figure is shown upside down with respect to the electronic timepiece 100 shown in FIG.
A battery housing portion 86 of the secondary battery unit 27 is formed on the ground plate 31 provided inside the exterior case 80. A guide hole 82a is formed in the base plate 31 in the battery housing portion 86, and the conduction spring 25 of the secondary battery unit 27 is inserted into the guide hole 82a. Thereby, the secondary battery unit 27 is positioned, and erroneous mounting is prevented. A contact portion 88 of the solar panel 87 is formed at a position corresponding to the guide hole 82a. The contact portion 88 is electrically connected to a negative power supply terminal 87n (not shown) of the solar panel 87 and is made of a conductive material.

Further, the ground plate 31 is provided with a leaf spring 40 having a minus side contact terminal 41. The leaf spring 40 is electrically connected to the negative power supply terminal 36n of the display control unit 36. The minus side contact terminal 41 and the leaf spring 40 are made of a conductive material. In this example, the negative power supply terminal 36n of the display control unit 36 is electrically connected to the leaf spring 40 and is biased in the direction of the arrow shown in FIG. Therefore, even if any of the secondary battery unit 27 and the primary battery having different thicknesses are accommodated in the battery accommodating portion 86, the negative power supply terminal 36n of the display control portion 36 can be electrically connected. In the battery housing portion 86, the secondary battery unit 27 and the primary battery are held by the base plate 31, the train wheel bridge 32, the plus terminal 38, and the leaf spring 40.
The contact portion 88 is not in contact with the primary battery when the primary battery is housed in the battery housing portion 86, and is electrically connected to the secondary battery unit 27 when the secondary battery unit 27 is housed in the battery housing portion 86. It is provided at a position in contact with the spring 25.

  FIG. 5 shows a cross-sectional view of the battery storage portion 86 in which the secondary battery unit 27 is stored. The secondary battery unit 27 includes a substrate 26, a conduction spring 25 connected to the substrate 26, a backflow prevention diode 28, and a negative terminal 27 n. The conduction spring 25 and the negative terminal 27n are made of a conductive material.

  When the secondary battery unit 27 is stored in the battery storage part 86, the negative contact terminal 41 of the leaf spring 40 and the negative terminal 27n of the secondary battery unit 27 come into contact with each other. Thereby, the minus terminal 27n of the secondary battery unit 27 and the minus power terminal 36n of the display control unit 36 are brought into conduction. Further, the conduction spring 25 comes into contact with the contact portion 88. Thereby, the negative power supply terminal 87n of the solar panel 87 and the charge control terminal 27c of the secondary battery unit 27 are conducted.

  The plus terminal 38 is electrically connected to a plus potential power supply wiring of the display control unit 36 (not shown). When the secondary battery unit 27 is housed in the battery housing portion 86, the plus side contact terminal 38a of the plus terminal 38 and the plus terminal of the secondary battery unit 27 (the plus electrode of the secondary battery 27a) are in contact with each other. ing.

  FIG. 6 is a schematic perspective view showing the contact state of the leaf spring 40, the backflow prevention diode 28, and the conduction spring 25 when the secondary battery unit 27 is stored in the battery storage portion 86. As shown in FIG. 6, the backflow prevention diode 28 has one terminal (cathode) connected to the solar panel 87 via the conduction spring 25 and the other terminal (anode) via the leaf spring 40. It is connected to the negative power supply terminal 36n of the display control unit 36.

  FIG. 7 is a circuit diagram when the secondary battery unit 27 is stored in the battery storage portion 86. The contact point X is a contact point between the plus side contact terminal 38 a of the ground plane 31 and the secondary battery unit 27. The contact point Y is a contact point between the minus side contact terminal 41 of the leaf spring 40 and the minus terminal 27 n of the secondary battery unit 27. Further, the contact point Z is a contact point between the conduction spring 25 and the contact portion 88 of the solar panel 87.

  As shown in FIG. 7, the positive electrode of the secondary battery 27 a of the secondary battery unit 27 is connected to the positive power terminal 36 p of the display control unit 36 and the positive power terminal 87 p of the solar panel 87 through the contact point X. Is done. Further, the negative electrode of the secondary battery 27 a is electrically connected to the negative power supply terminal 36 n of the display control unit 36 through the contact point Y. Further, the negative electrode of the secondary battery 27 a is connected to the negative power supply terminal 87 n of the solar panel 87 through the backflow prevention diode 28, the conduction spring 25 and the contact point Z.

Therefore, the secondary battery unit 27 is charged by the solar panel 87 while preventing the backflow of current from the secondary battery unit 27 to the solar panel 87. In addition, power is supplied from the secondary battery unit 27 to the display control unit 36.
In the present embodiment, the maximum output voltage of the solar panel 87 is set so as not to exceed the withstand voltage of the secondary battery unit 27. Here, if the maximum output voltage is Vmax, the breakdown voltage of the secondary battery 27a is Vx, and the voltage drop of the backflow prevention diode 28 is Vd, then Vmax <Vx + Vd. Further, Vmax <Vx may be satisfied. For example, the solar panel 87 may be a three-cell amorphous silicon solar battery with a maximum output voltage of 2.4 V, and the secondary battery 27 a may have a charging limit of 2.6 V or more.

  FIG. 8 is a cross-sectional view showing a state where the primary battery 50 is stored in the battery storage portion 86. As shown in FIG. 8, the primary battery 50 has the same diameter as the secondary battery unit 27. Further, the primary battery 50 is not provided with a conduction spring and a backflow prevention diode. Further, the thickness of the primary battery 50 is larger than the thickness of the secondary battery unit 27.

  When the primary battery 50 is stored in the battery storage portion 86, the primary battery 50 is held by the taper portion of the base plate 31 and the primary battery 50 coming into contact with each other. In this state where the primary battery 50 is held, the negative contact terminal 41 of the leaf spring 40 and the negative electrode of the primary battery 50 are in contact. Further, the plus side contact terminal 38 a of the plus terminal 38 and the plus electrode of the primary battery 50 are in contact with each other.

FIG. 9 is a circuit diagram when the primary battery 50 is stored in the battery storage portion 86. In FIG. 9, the contact point X is a contact point between the plus-side contact terminal 38 a of the plus terminal 38 and the plus terminal of the primary battery 50. Further, the contact point Y is a contact point between the minus side contact terminal 41 of the leaf spring 40 and the minus terminal of the primary battery 50.
The positive terminal of the primary battery 50 is electrically connected to the positive power supply terminal 36 p of the display control unit 36 through the contact point X. Further, the negative electrode of the primary battery 50 is electrically connected to the negative power supply terminal 36 n of the display control unit 36 through the contact point Y.
However, since the conduction spring 25 is not provided in the primary battery 50, the primary battery 50 and the solar panel 87 are not connected. Therefore, the charging current does not flow from the solar panel 87 to the primary battery 50, and the problem that the primary battery 50 is destroyed can be prevented.
In this way, when the primary battery 50 is stored in the battery storage unit 86, power is supplied from the primary battery 50 to the display control unit 36.

  As described above, according to the present embodiment, by adopting the secondary battery unit 27 in which the secondary battery 27a and the substrate 26 on which the backflow prevention diode 28 is mounted are adopted, the secondary battery unit 27 is also provided. By providing a conductive spring 25 and electrically connecting to the solar panel 87, all parts of the movement except the battery can be shared between the primary battery type electronic timepiece and the solar panel type electronic timepiece. it can. As a result, significant cost reduction can be realized.

  FIG. 10 shows a cross-sectional view of a primary battery type electronic timepiece. In the primary battery type electronic timepiece 200 shown in the figure, all components used therein are shared with the parts of the solar panel type electronic timepiece 100 shown in FIG. In the primary battery type electronic timepiece 200, even if the secondary battery unit 27 is housed instead of the primary battery 50, the conduction spring 25 only contacts the non-conductive dial 11, so that the secondary battery If the battery 27a is charged, the primary battery type electronic timepiece 200 can be operated.

  In addition, the movement of the watch of the present embodiment functions as an analog watch when the primary battery 50 is incorporated, and functions as a solar panel electronic watch when the secondary battery unit 27 is incorporated. It is a very high movement and can greatly improve production efficiency. In particular, if the secondary battery breaks down and needs to be replaced but cannot be obtained immediately, storing the primary battery 50 in place of the secondary battery unit 27 ensures that the solar panel electronic timepiece 100 is secured. Can be operated.

DESCRIPTION OF SYMBOLS 100 ... Electronic timepiece, 25 ... Conduction spring, 26 ... Board | substrate, 27 ... Secondary battery unit, 27a ... Secondary battery, 28 ... Backflow prevention diode, 31 ... Ground plate, 38 ... Positive terminal, 38a ... Positive side contact terminal, 40 ... leaf spring, 50 ... primary battery, 12 ... pointer shaft, 13 (13a, 13b, 13c) ... pointer, 30 ... drive mechanism, 80 ... exterior case, 84 ... cover glass, 85 ... back cover, 86 ... battery housing , 87 ... Solar panels.

Claims (4)

A secondary battery,
A conductive spring;
A backflow prevention diode having one terminal connected to the negative electrode of the secondary battery and the other terminal connected to the spring;
Comprising
A secondary battery unit characterized by that. A solar panel electronic timepiece operable by the secondary battery unit according to claim 1,
Solar panels,
A battery storage section capable of storing the secondary battery unit or the primary battery;
With
In the battery housing part, a contact part for connecting the spring and the negative electrode of the solar panel is arranged,
A solar panel type electronic timepiece . The secondary battery has the same diameter as the primary battery,
The thickness of the secondary battery is thinner than the thickness of the primary battery,
The solar panel type electronic timepiece according to claim 2 . In the state where the primary battery is stored in the battery storage portion, the contact portion is not in contact with the primary battery,
In the state where the secondary battery unit is stored in the battery storage unit, the contact unit is in contact with the spring.
The solar panel type electronic timepiece according to claim 2 or 3, wherein

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