JPS6082882A - Analog electronic timepiece with solar battery - Google Patents

Abstract

PURPOSE:To improve design freedom and power generating capacity of a clock and simplify and facilitate its assembly, by installing a multi-layer film type solar battery. CONSTITUTION:A solar battery substrate 26 of plastic film is attached to a metallic dial plate 27 and a power-generating layer 25 integrated with power- collecting electrode and amorphous semiconductor is formed on the plate 27. By this arrangement, design of the clock becomes available with facility due to freedom from restrictions imposed by a solar battery and further, by using a large-area solar battery without requiring series connection of a small-area solar battery, power-generating capacity is increased also and assembly of the clock can be made simply and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an analog electronic timepiece having a solar cell mounted on its dial.

FIG. 1 is a plan view of a conventional analog electronic watch with a solar cell, in which an amorphous silicon solar cell is formed on the windshield.

FIG. 2 is a sectional view of the windshield shown in FIG. 1.

1 is the outer body of the outer case, 2 is a windshield glass and is fixed to the outer body 1 with adhesive. 03 is the hour ml, and 4 is the minute hand. 5-1
Reference numeral 6 denotes amorphous silicon thick battery cells formed on the back surface of the windshield 2, and in this example, 12 amorphous silicon thick cells are formed. 5a~
16α is a transparent current collecting electrode. 5b to 16b are amorphous silicon layers, each of which has a five-layer structure of p-type, i-type, and n-type amorphous silicon. Conductive. 17 is a coil spring that connects the negative output terminal of the solar cell and the clock movement. The open circuit voltage of one amorphous silicon solar cell under sunlight is approximately ■. . =08■. Therefore, in order to efficiently charge the secondary battery output of 1.5 V for electronic watches, it is necessary to
Cells 10 and 11 to 16 are connected in series, and these two series-connected cell groups are wired in parallel to obtain an open circuit output voltage of about 4.8 V. Furthermore, the dividing lines between the 12 solar cells represent the time scale.

In a thick @ battery with a configuration in which solar cells are arranged in series, even if one of the cells is not exposed to light, the output of the series configuration solar battery will be 0■.For this reason, a solar cell for a portable wristwatch is used. If solar cells with a series configuration are used for the battery, there will be very few opportunities to charge the battery while it is being carried.Furthermore, the output current is determined by the size of the smallest area cell among the series-connected solar cells. Since the solar cells are formed on the windshield, if the area of the solar cells is made too large, the needles will be hidden. Furthermore, since the solar cell is composed of 12 cells, the area of one cell is extremely small, making it impossible to obtain a large output current. Furthermore, since the time scale can only be represented by dividing lines between solar cells, there is less variation in design.

In order to eliminate these drawbacks, the present invention forms a solar cell on the dial, and will be described in detail below with reference to the drawings.

FIG. 6 is a cross-sectional view of one embodiment of an analog electronic timepiece in which a solar cell is mounted on the dial of the present invention.

FIG. 4 is a plan view thereof.

20 is the outer body, 21 is the windshield, 22 is the back cover,
The exterior case is made up of the above parts. The time is indicated by an hour hand 23 and a minute hand 24.

Reference numeral 25 denotes a power generation layer made of a laminated structure of a current collecting electrode and an amorphous semiconductor, and is formed on a solar cell substrate 26 made of a plastic film.

27 is a dial base made of metal, and the solar cell substrate 2
6 is adhered to form a dial plate with a solar cell. 28
is a clock movement that drives the hour hand 23 and minute hand 24. Reference numeral 29 denotes an electrode substrate made of a flexible plastic film, on which a positive electrode extraction pattern 60 and a negative electrode extraction pattern 31 formed of a steel foil pattern are wired. Reference numeral 32 denotes an insulating film, which prevents each electrode extraction pattern from forming a sheet with the current collecting electrode of the power generation layer 25. With these component configurations, the electrode extraction board 3
3 is composed. 34 is a positive lead spring, 35 is a negative lead spring, and is connected to the movement 28. Each spring comes into contact with each copper foil pattern on the electrode extraction board 33, thereby conducting current from the solar cell to the movement 28. 40 in Figure 4
~42 parts are solar cell positive conductive parts formed with protrusions on the electrode takeout substrate 33, and 46~45 parts are also the electrode takeout substrate 6.
3 is a solar cell negative conduction part formed with a protrusion, and spring contacts the positive collector 1'L electrode formed in the power generation part of the solar cell and the negative current collector electrode to establish continuity.・With each current collector electrode of the solar cell. The reason for establishing continuity at multiple locations is to improve contact reliability and reduce contact resistance. Further, although the positive electrode extraction pattern z30 and the negative electrode extraction pattern 31 were copper foil patterns, they may be printed patterns of graphite or silver.

FIG. 5 is a cross-sectional view of thick battery conductive portions 40 to 45 formed on the electrode lead-out substrate.

Contact pressure with the solar cell is taken by forming protrusions on the flexible electrode substrate 29.

FIG. 6 is an embodiment of a detailed sectional view of a dial plate with a solar cell.

50 is a transparent positive current collecting electrode, and 51 is a negative current collecting electrode made of aluminum. 52.5'3゜! 741J IaL each optically prohibited J1 Boat'I#j'y': XI:
- It is a power generation section consisting of an i/x ammo/l/7 as semiconductor, and each layer is a p-type,
It has a three-layer structure of 1-type and n-type amorphous semiconductors.

As a result, the power generation section 52 absorbs short wavelength light, and the power generation section 53
absorbs visible light, and the power generation section 54 absorbs long wavelength light. The open circuit voltage of each power generation section is approximately Woe = 0.8 V
Therefore, the output voltage of the solar cell of this example under sunlight is about 2.4 V.

This is enough current to charge a 1.5 V secondary power supply. In addition, since the entire dial is a single cell battery, it generates electricity as long as only a portion is exposed to light.The light-receiving surface tank can also be made very large, so a large charging current can be obtained. It is an excellent solar battery for wristwatches mainly used in mobile phones. Furthermore, since the solar cell does not have dividing lines or the like, it is possible to express the hourly scale or the like in any shape on the positive current collecting electrode 50 using means such as printing, which greatly expands the variety of designs. Amorphous half-shi again! Since the 7 bodies are made using the vapor phase growth method, free patterns are possible, which also expands the variety of designs.0 Figure 7 shows the electrode extraction board 63 and the positive current collecting electrode 50 of the thick battery.
8 is a 1-no-c plane view of the contact portions 40, (41), (42) with the contact portions 4s, (44), (45) between the electrode take-out substrate 33 and the negative current collecting electrode 51 of the solar cell. )
Cross-sectional view.

Since the electrode extraction board 53 has a deformed ring shape, by setting the inner diameter of the outer body 20 as a guide, and then setting the movement 28 with a dial and the back cover 22, a solar cell watch is completed. The electrode extraction structure is very easy to assemble. In addition, although this example uses a thick battery with a three-layer structure, the electrode extraction structure of this example can also be used for a dial plate with a solar cell that has a single-layer structure and is divided into several stages as in the prior art.

Further, although the solar cell substrate 26 in this embodiment is a plastic film, it may be made of metal or the dial base 27 itself. In this case, one electrode can be taken directly from the dial.

Further, although the positive lead spring 64 and the negative lead spring 35 are plate springs, they may be fill springs.

FIG. 9 is a cross-sectional view of an embodiment in which electrodes are taken out from the typesetting foot of the dial plate.

60 is a typeface made of metal, and 61 is an insulating frame that prevents the typeface 60 and the dial base 27 from collapsing. The typesetting letters 60 are caulked on the back side of the dial base 27 so that they do not come off. The generated current flows from the transparent current collecting electrode of the power generation section 25 to the lead spring 34 through the typeface 60. In this embodiment, since the time scale of the dial plate or typesetting of marks is used to take out the electrodes, the appearance of the dial plate is completely unchanged from the conventional one.

As mentioned above, the present invention has a variety of designs.

It is an analog electronic clock with a solar battery that has sufficient power generation capacity even while being carried and is easy to assemble. The present invention can also be applied to a digital watch with a solar cell mounted on the parting plate.

[Brief Description of the Drawings] Fig. 1 is a plan view of a conventional analog electronic time J1° with a solar cell in which an amorphous silicon solar cell is formed on the windshield. Fig. 2 is a cross-sectional view of the windshield shown in Fig. 1. 1-...-Outer body 2...Windshield glass 5-16...
. . . Amorphous solar cell formed on the back surface of the windshield 1 FIG. 3 is a cross-sectional view of an embodiment of an analog electronic watch in which a solar cell is mounted on the dial of the present invention, and FIG. 4 is a plan view thereof. 25...Power generation layer 26...Thick VJ made of plastic film
Jjm pond base 27... Dial board base 53... Electrode take-out 17 board 34... Plus lead spring 35... Minus lead springs 40 to 42... ...Solar cell plus conduction parts 43 to 45
・・・・・・Thick@Battery negative conduction part FIG. 5J is a sectional view of the solar cell conduction part formed on the electrode extraction substrate. FIG. 6 is an example of a detailed sectional view of a dial plate with a solar cell. 50... Transparent positive current collecting electrode 51... Negative current collecting electrodes 52 to 55 made of aluminum
. . . A power generation section made of amorphous semiconductors each having a different optical bandgap width. FIG. 7 is an MR cross-sectional view of the contact area between the electrode extraction substrate 33 and the positive current collecting electrode 50 of the solar cell. FIG. 8 is an electrode extraction section. FIG. 3 is a cross-sectional view of the contact portion between the substrate 33 and the negative current collecting electrode 51 of the solar cell 11L. FIG. 9 is a cross-sectional view of an embodiment in which electrodes are taken out from the typesetting foot of the dial plate. 60-... Typesetting 61... Insulating frame or above Applicant Suwa Seikosha Co., Ltd. Agent Patent attorney

Claims (1)

[Scope of Claims] 1. An analog electronic watch comprising an outer case, a dial equipped with a solar cell, and a movement that drives hands that indicate the time, characterized in that the solar cell is a multilayer solar cell. Analog electronic clock with solar battery. 2. In an analog electronic watch consisting of an outer case, a dial mounted with a thick battery, and a movement that drives a hand that indicates time C, an electrode extraction board with a conductive pattern formed between the outer case and the solar cell mounted dial is provided. An analog electronic clock with a solar battery. 3. An analog electronic watch consisting of an exterior case, a dial equipped with a solar cell, and a movement that drives hands that indicate the time, wherein the dial equipped with a solar cell is characterized in that electrodes are taken out by typesetting. Analog electronic clock.