WO2004055605A1 - ソーラーセル付き電子時計 - Google Patents
ソーラーセル付き電子時計 Download PDFInfo
- Publication number
- WO2004055605A1 WO2004055605A1 PCT/JP2003/016077 JP0316077W WO2004055605A1 WO 2004055605 A1 WO2004055605 A1 WO 2004055605A1 JP 0316077 W JP0316077 W JP 0316077W WO 2004055605 A1 WO2004055605 A1 WO 2004055605A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solar cell
- dial
- ring
- electronic timepiece
- windshield
- Prior art date
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Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C10/00—Arrangements of electric power supplies in time pieces
- G04C10/02—Arrangements of electric power supplies in time pieces the power supply being a radioactive or photovoltaic source
Definitions
- the present invention relates to a solar power generation system that generates electricity using light, and an electronic timepiece with a solar cell in which a solar cell is disposed in a return portion in a timepiece having a charging system that charges power generated by the solar power generation system.
- the dial since the surface of the solar cell is dark brown, it is necessary to place the dial on the solar cell to hide the surface color.
- the dial had to have some light-transmitting properties, that is, light transmittance. For this reason, even if the color of the dial is changed to white, gray like frosted glass becomes the dial of the old color tone, and there is a limitation in the design because a beautiful white color cannot be obtained.
- Patent Document 1 Japanese Patent Publication No. 3900
- Patent Application Publication No. 1 Japanese Patent Application Publication No.
- FIG. 10 is a sectional view of the timepiece of the first embodiment described in FIG. 1 of Patent Document 1.
- This timepiece has a solar cell block 23 in which a plurality of solar cells 20 are adhered to a printed circuit board 21 and housed in grooves 22 a of a support ring 22.
- This solar One cell block 23 is arranged below flange 26 fixing windshield 24.
- the support ring 22 has an eave portion 2 connecting the inner ring 22 b and the outer ring 22 c.
- the solar cell 20 has a structure arranged on the dial 25.
- FIG. 11 is a sectional view of a timepiece according to a second embodiment described in FIG. 3 of Patent Document 1.
- This watch is equipped with a solar panel / relay in the gap between the windshield 33 and the dial 34.
- the solar cell unit 36 is arranged so as to be wound around the inside wall of the facing portion 31 of the watch case 35.
- the solar cell unit 36 is formed by bonding a solar cell 30 made of amorphous silicon to a thin stainless steel plate 32.
- FIG. 12 is a sectional view of a timepiece according to a first embodiment of Patent Document 2.
- a ring-shaped bank 45 is provided above the position of the dial 43 of the clock movement 44, and a solar cell 40 is provided on an inner wall 46 of the bank 45.
- 41 is a windshield and 42 is a side flange.
- the gap between the windshield 24 and the dial 25 is determined not only by the height of the solar cell 20 but also by the height of the flange 26 and the eaves 22d. Is the total size. For this reason, the gap between the windshield 24 and the dial 25 is widened, and as a result, the position of the dial 25 as viewed from the windshield 24 is deep, forming a so-called “deep watch”. It had a design problem. In addition, the needle position was deepened or the needle interval was widened, resulting in poor design and reduced product value.
- the gap with 4 became narrower, the current solar cell performance requires that the cell width be increased to some extent, and the height of the cell is high, and the gap is still wide. Moreover, since the solar cell 30 is exposed in the gap between the windshield 33 and the dial 34, the brown color peculiar to the solar cell is directly visible from the outside of the clock 35, especially On a brightly colored dial, the solar cell 30 became prominent as a black ring, causing a design problem.
- the structure shown in FIG. 12 has a structure in which a solar cell 40 is arranged below a flange portion 42 for fixing a windshield 41, similarly to the conventional example shown in FIG. Therefore, the gap between the windshield 41 and the dial 43 is not limited to the height of the solar cell 40.
- the height is the sum of the heights of the flanges 42, and the gap between the windshield 41 and the dial 43 becomes wider.
- the position of the dial 43 as viewed from the windshield 41 was deep, resulting in a design problem that the dial 43 became a “back-to-back clock”.
- the solar cell in order to obtain sufficient energy to drive the timepiece, the solar cell requires a certain area, and a man-owned watch with a large parting diameter, that is, the length of the solar cell Even if the clock can take a long time, but the clock of the black dial, the height of the required solar cell is solar power generation! /, It becomes larger than the height of the gap between the windshield and the dial of the watch. As a result, there was a problem that it became a “back-to-back clock”.
- the present invention provides an electronic timepiece with a solar cell in which the solar cell is disposed substantially perpendicular to the dial, while ensuring the amount of power generation required to drive the timepiece, and making the solar cell inconspicuous. Aims to provide a watch that does not allow the user to feel the depth of the dial position. Disclosure of the invention
- the present invention provides an electronic timepiece with a solar cell in which a solar cell is arranged substantially perpendicular to the dial, wherein a light guide portion is provided on a peripheral portion of the dial, and a light transmissive return is provided on a peripheral portion of the dial.
- a ring is disposed, and a part of the solar cell power generation region and a part of a dial ring covering the power generation region of the solar cell are disposed below the upper surface of the dial.
- a light-transmitting dial ring and a light guide that is the entrance of the power light, where the dial is installed.
- the incident light from the dial ring can be lower than the upper surface of the dial.
- the present invention has a configuration in which the thickness of the inside of the dial is made thicker than the peripheral portion. I have.
- the present invention is configured such that the light guide portion has a slope portion configured to reduce the thickness of the dial from the inner side toward the peripheral side.
- the thickness of the inside of the dial plate By making the thickness of the inside of the dial plate thicker than the peripheral edge, a difference in the thickness of the dial plate occurs. However, by providing the slope, the appearance can be made less noticeable.
- the light guide portion is configured such that the thickness of the dial is reduced at a peripheral portion.
- Forming a step on the outer periphery of the dial can be easily performed by pressing, milling, etc., but can also be realized by laminating two disks with different outer diameters. There is a merit that it is easy to do.
- the present invention is configured such that a slope portion is provided in the dial ring, and the slope portion covers a slope or a step portion of the light guide portion of the dial.
- the light that can secure the amount of power required to drive the timepiece is taken in.
- the light guide section is provided, and the watch is a flat dial in appearance. It is possible to realize the same appearance as an electronic watch having a conventional temporary battery.
- the present invention provides a watch case of the electronic watch with a solar cell, a flange for fixing a windshield to the watch case, a watch movement or a middle frame for holding the dial, the solar cell, and the solar cell. It is provided on the outer side of the ring-shaped convex portion, the dial is arranged directly below the windshield, and a blindfold is provided on the dial and / or the solar cell on the windshield. Since the dial ring can be placed directly below the windshield, the gap between the windshield and the upper surface of the dial can be reduced by the thickness of the flange, making it possible to achieve the same gap as an electronic watch with a conventional primary battery.
- the solar cell can be hidden from directly above the glass.
- FIG. 1 is a cross-sectional view of a main part of an electronic timepiece with a solar cell that represents Example 1 of the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a main part of an electronic timepiece with a solar cell according to a second embodiment of the present invention.
- FIG. 3 is a plan view of the solar cell of the present invention.
- FIG. 4 is a perspective view showing a state where the solar cell of the present invention is assembled in a timepiece.
- FIG. 5 is a movement plan view of the electronic timepiece with solar cell of the present invention.
- FIG. 6 is a graph showing the light receiving efficiency with respect to the dial thickness according to Example 1 of the first embodiment of the present invention.
- FIG. 7 is a cross-sectional view of a main part of an electronic timepiece with a solar cell showing a state in which a dial ring is changed according to Example 2 of the first embodiment of the present invention.
- FIG. 8 is a cross-sectional view of a main part of a solar cell-equipped electronic timepiece according to Example 3 of the first embodiment of the present invention, showing a form in which the dial shape is changed.
- FIG. 9 is another embodiment of Example 1 of the first embodiment of the present invention, and is a cross-sectional view of a main part of an electronic timepiece with a solar cell in which the solar cell is arranged in a middle frame.
- FIG. 10 is a cross-sectional view of a main part of a conventional electronic timepiece with a solar cell disclosed in Patent Document 1.
- FIG. 11 is a cross-sectional view of a main part of a conventional electronic timepiece with a solar cell disclosed in Patent Document 1.
- FIG. 12 is a cross-sectional view of a main part of a conventional electronic timepiece with a solar cell disclosed in Patent Document 2.
- FIG. 1 is a cross-sectional view of a main part of an electronic timepiece with a solar cell according to a first embodiment of the present invention
- FIG. 3 is a plan view of a solar cell according to an embodiment of the present invention
- FIG. 4 is an embodiment of the present invention.
- FIG. 4 is a perspective view showing a state where the solar cell of FIG.
- the solar cell 1 is made by forming an amorphous silicon layer on a PET film of the base substrate, has a thickness of about 150 ⁇ , and bends it into a watch case as shown in Fig. 4. This is a flexible solar cell having an elongated strip shape.
- the solar cell 1 of the present embodiment is a single cell, 1a is a photovoltaic power generation area, 1b and 1c are positive and negative electrodes for extracting generated power, and 1d is a solar cell for a clock movement. It is a projection having a hole for positioning when incorporated.
- the entire periphery of the photovoltaic region la has an edge 1 e with a width of about 400 ⁇ , which does not generate electricity even when exposed to light.
- This is a sheet in which many solar cells are formed on a PET film. This is the cutting allowance for cutting and separating the solar cells into individual solar cells.
- the photovoltaic power generation area 1a is assembled into a watch in a ring shape facing the center of the watch.
- the circuit support base 3 is extended in the up-down direction, and the upwardly extended portion is further extended toward the windshield 4 to form the ring-shaped convex portion 3a.
- the solar cell 1 is flexible as described above, and is rolled into the inner wall surface 3 b of the ring-shaped convex portion 3 a of the circuit support base 3, and the convex portion 3 a is formed by the tension of the solar cell itself to spread. It is attached to the inner wall 3b in a shape as shown in FIG.
- the dial 5 is placed on a circuit support 3 located on the clock center side of the solar cell 1 arranged in a ring shape.
- a light-transmitting dial ring 2 is arranged on the peripheral portion 5a of the dial 5. That is, it has a structure in which the dial ring 2 is arranged inside the solar cell 1.
- the dial 5 is not uniform in thickness, and the dial inner side 5b where the hour / minute / second hand 11 is located is thicker in the windshield 4 direction than the dial peripheral edge 5a on which the dial ring 2 is placed. ing.
- the slope 5d is formed by connecting the step between the dial peripheral edge 5a and the dial inner side 5b so that the dial thickness decreases from the inner side 5b toward the peripheral side 5a. Is formed.
- the step and the slope 5d form a light guide portion 2a to ensure a certain width of the light entrance to the dial ring 2.
- the required amount of power generation can be secured, and at the same time, by increasing the thickness of the dial on the inside 5b of the dial, the gap between the windshield glass 4 and the dial 5 becomes smaller than that of the conventional primary battery. It can achieve the same depth as an electronic watch.
- a part of the photovoltaic power generation area 1a of the solar cell 1 (hatched part of the solar cell 1 in FIG. 1) and a part 2b of the dial ring 2 covering the power generation area 1a of the solar cell 1 are attached to the dial. Also located below the top 5c position. By doing so, it is possible to narrow the gap from the windshield 4 to the upper surface of the dial peripheral portion 5a where the dial ring 2 is arranged.
- light transmitted through the dial ring 2, which is a light guide member is radiated from a part 2b of the dial ring 2, and power is also generated in a part of the solar cell 1 disposed below the upper surface 5c of the dial. It can be performed.
- connection panel 8 On the back cover 10 side, two connection panels 8 are arranged.
- the connection panel 8 is fixed to a circuit board (not shown) via a holding plate that sandwiches an insulating sheet.
- the tip 8a of the connection panel 8 has a structure in which the power contacts the positive and negative electrodes lb and 1c of the solar cell and guides the power generated from the solar cell 1 to the circuit board.
- FIG. 5 is a plan view of the timepiece movement 6 shown in FIG. 1 as viewed from the back cover side, and shows a planar arrangement relationship of the two connection springs 8 and the solar cell 1 described above.
- the connection panel 8 is held and fixed by screws 8b or the like in order to establish electrical connection between the solar cell 1 and the circuit board.
- Table 1, Fig. 1 and Fig. 1 show the difference in power generation performance between an electronic timepiece with a solar cell using a dial 5 with a thicker inner side 5b and an electronic timepiece with a solar cell using a flat dial. This will be described with reference to FIG.
- a typical flat dial has a thickness A of about 40 Oum.
- the dial 5 shown in Fig. 5 has a thickness D of 300 ⁇ m on the peripheral edge 5a on which the dial ring 2 is mounted, and a thicker inner side 5b with a slope at an angle of 45 degrees from the inner circumference.
- the power generation performance was measured when the thickness B was changed to 7 ⁇ and 100 ⁇ , and the results are summarized in Table 1.
- the lower end of the power generation area 1a of the solar cell 1 is at a position where it enters the same height as the lower surface 5e of the dial 5.
- the above-mentioned light-receiving efficiency is defined as the completed solar cell including the solar cell itself, with respect to the generated current value when light is applied from the vertical direction to the photovoltaic power generation area with the single solar cell placed flat.
- the dial ring used for the measurement is light-transmissive and is made by injection molding from a colorless and transparent polycarbonate resin, and its surface is a glossy surface.
- the light receiving efficiency of a flat-faced dial with a dial thickness of 40 ⁇ is 21.1%, whereas the dial inside thickness is increased by 70 ⁇ ⁇ and ⁇ 1 0 0
- the light receiving efficiency of the dial set to 0 ⁇ was 19.9% and 18.9%, respectively.
- FIG. 6 is a graph of the light receiving efficiency with respect to the dial thickness obtained from the data of Table 1, and as shown in FIG. 6, the light receiving efficiency tends to decrease as the dial thickness increases. This result shows that as the thickness (2) of the dial 5 in FIG. 1 becomes thicker, the light guide portion 2a of the light becomes narrower, and the light hardly enters, which is a natural result.
- Size outside solar cell length 92.1 mm, width 2.4 mm
- Effective size of solar cell receiver length 91.3 mm, width 1.6 mm
- the power generation performance of the solar cell is 500 lux illuminance, the operating voltage is 0.45 V, and the power generation current is 6 ⁇ m when the solar cell is placed flat.
- the electronic timepiece with a solar cell uses a single-stage solar cell.
- the open-circuit voltage Voc of the solar cell is 0.6 V, and a Li secondary battery with a rated voltage of 1.35 V is charged. In order to achieve this, it is necessary to increase the generated voltage.
- the boost system has a boost factor of 3 times and a boost efficiency of 90%, the amount of power generated by the completed watch under the above-mentioned average light irradiation conditions per day is as follows:
- the average illuminance per day is 500 1 uX and the average irradiation time is 4 hr. If the amount of power generated by the completed watch under the average irradiation conditions per day in (2) is greater than the amount of power consumption required for one day's operation ⁇ (in (1), the watch will work as a clock. It can be calculated by the following equation. That is,
- Minimum light receiving efficiency clock power dissipation x 24 hr + irradiation time + generated current X boost factor ⁇ ⁇ boost efficiency
- the light receiving efficiency is 17.7% or more, it can be realized as a clock.
- the gap between the windshield and the dial of a three-hand electronic watch with a conventional primary battery is about 1500 to 160 ⁇ , as shown in Table 1, the dial thickness ⁇ is 100 ⁇ .
- the gap size C was 155 ⁇ , which is equivalent to that of a three-needle electronic clock having a conventional primary battery, and the light receiving efficiency at this time was 18.9%.
- the calculated value of the minimum light-receiving efficiency described above was greater than 17.7%, and while the amount of power generation that could function as a watch was obtained, the gap size between the windshield and the dial was reduced by the conventional primary value. It is possible to make it equivalent to a three-hand electronic watch with a battery.
- FIG. 7 is a sectional view of an essential part of an electronic timepiece with a solar cell according to the present invention, showing Example 2.
- the slope 2 c of the light guide portion 2 a of the dial ring 2 is protruded toward the center of the clock, and the extension of the slope of the slope 2 c is the extension of the dial 5. It is set so as to intersect with the extension of the thick upper surface 5c of the thick portion (B), and the slope 2c covers the slope 5d of the light guide portion of the dial 5 with the slope 2c.
- the dial ring 2 By forming the dial ring 2 to cover the dial slope 5d as shown in Fig. 7, the step between the dial ring 2 and dial slope 5d shown in Fig. 1 can be eliminated.
- the area of the light guide portion 2a for light to the solar cell 1 can be secured.
- FIG. 8 is a sectional view of an essential part of an electronic timepiece with a solar cell according to the present invention, showing Example 3.
- the slope 2 c of the light guide portion 2 a of the dial ring 2 is protruded toward the center of the clock, and the extension of the slope of the slope 2 c is the extension of the dial 5. It is set so as to intersect with the extension of the thick upper surface 5c of the thick portion (B), and the slope portion 2c covers the slope 5d of the light guide portion of the dial 5.
- the step between the dial peripheral part 5a of the dial 5 and the dial inner side 5b is connected.
- Forming a step on the outer periphery of the dial can be easily performed by pressing, milling, etc. However, it can also be realized by laminating two disks with different outer diameters, and has the merit that it is easier to process than a structure that forms a slope.
- FIG. 9 is a sectional view of a main part of an electronic timepiece with a solar cell according to the present invention, showing Example 4 of the present invention.
- the solar cell 1 is described as having a structure in which the solar cell 1 is disposed on a ring-shaped convex portion 3 a for positioning the solar cell 1 provided on the circuit support base 3 which is a component of the timepiece movement 6. did.
- FIG. 9 shows a case 50 in which a ring-shaped convex portion 50 a for positioning a solar cell is provided on a middle frame 50, which is an exterior component used for housing the watch movement 6 in the watch case 12. It has a structure in which the solar cell 1 is arranged on the inner wall 50 of a.
- the fourth embodiment can be implemented by using the timepiece structure in the second embodiment.
- the middle frame is an external component for storing and holding the clock movement in the watch case when the clock movement is assembled in the watch case, and for absorbing shock from the outside of the watch.
- the light incident surface for taking in the external light of the dial ring 2 is made of a thin film of aluminum or the like on the surface 2d (indicated by the broken line), which is not the light emission surface toward the solar cell.
- a reflective film was provided by vapor deposition or the like. The reflection film can prevent light from leaking from the surface 2 d to the outside of the dial ring 2, thereby increasing the amount of light incident on the solar cell 1 and increasing the power generation amount. became.
- FIGS. 1, 2, 8, and 9 it was possible to increase the amount of power generation by attaching a reflective film to the dial ring.
- the light receiving efficiency is also affected by the color of the dial, and if a dial with a color that is likely to reflect light, such as white or bright, or a color dial with a higher color, the light receiving efficiency will increase. Often smaller. When the dial color is black or white, the white light receiving efficiency is more than doubled.
- the light-transmitting return ring is arranged inside the solar cell, Part of the cell power generation area and part of the dial ring that covers the power generation area of the solar cell are arranged below the upper surface of the dial.
- the thickness of the dial inside the dial should be thicker than the peripheral edge of the dial on which the dial ring is mounted, while securing the amount of light incident on the solar cell to obtain the power required for driving the Nitera meter.
- FIG. 2 is a cross-sectional view of a main part showing a second embodiment of the present invention.
- the watch movement 6 shown in the first embodiment in which the light-transmitting dial ring 2 is attached to the outer periphery of the dial 5 is used.
- a flat dial 5 with a thickness of 0 ⁇ is used.
- a flange portion 13 for holding and fixing the windshield 4 is incorporated in a clock case 12 located outside and on the upper surface side of the solar cell 1 and the dial ring 2.
- the solar cell 1 and the return ring 2 are arranged immediately below the windshield 4, and a ring-shaped print 4a is placed on the lower surface of the windshield 4 where the solar cell 1 and the return ring 2 are located. It has been given.
- the conventional flange 26 shown in FIG. The thickness can be omitted.
- the gap between the windshield 4 and the dial 5 is 2 15 ⁇ ⁇ , whereas Can be made to be 170 0 ⁇ ⁇ .
- the gap is almost equivalent to that of a three-hand electronic timepiece having a conventional primary battery, so that the design of “back eyes” can be eliminated.
- ring-shaped printing or metal film 4a is attached to the lower surface of the windshield immediately above the dial ring 2 and the solar cell 1 so that the solar cell 1 and the dial ring 2 etc. It can be shielded so that it cannot be seen, and the appearance quality can be improved.
- the light receiving efficiency is about 21.1%, which is equivalent to the case of using the flat dial having a dial thickness of 40 ⁇ in the first embodiment. Yes, a more sufficient amount of power generation can be obtained than with the watch having the specifications described in Example 1 of the first embodiment.
- the description has been given using a band-shaped single cell solar cell. It is also possible to use a solar cell such as a two-stage cell in which a solar cell of the same size is divided into two on the left and right.
- a solar cell-equipped electronic timepiece in which a solar cell is disposed substantially perpendicular to the dial, and a light-transmitting return ring is provided inside the solar cell.
- the gap between the lower surface of the windshield and the upper surface of the dial is narrowed by placing a part of the solar cell power generation area and part of the dial ring that covers the power generation area of the solar cell below the upper surface of the dial.
- the gap between the lower surface of the windshield and the upper surface of the dial is increased by increasing the thickness of the dial inside side from the peripheral portion of the dial while securing a light guide portion for light incident on the dial ring. It is possible to provide an electronic timepiece with a solar cell, which can be made narrower and which eliminates the “outback” design.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03778950A EP1574919A4 (en) | 2002-12-16 | 2003-12-16 | ELECTRONIC CLOCK WITH SOLAR CELL |
US10/534,234 US20060050618A1 (en) | 2002-12-16 | 2003-12-16 | Electronic timepiece with solar cell |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-363706 | 2002-12-16 | ||
JP2002363706 | 2002-12-16 |
Publications (1)
Publication Number | Publication Date |
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WO2004055605A1 true WO2004055605A1 (ja) | 2004-07-01 |
Family
ID=32588213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/016077 WO2004055605A1 (ja) | 2002-12-16 | 2003-12-16 | ソーラーセル付き電子時計 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060050618A1 (ja) |
EP (1) | EP1574919A4 (ja) |
CN (1) | CN1726438A (ja) |
WO (1) | WO2004055605A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9709959B2 (en) | 2014-06-24 | 2017-07-18 | Citizen Watch Co., Ltd. | Electric timepiece with solar cell |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007285748A (ja) * | 2006-04-13 | 2007-11-01 | Seiko Epson Corp | 腕時計 |
TW201034217A (en) * | 2008-12-19 | 2010-09-16 | Koninkl Philips Electronics Nv | A photovoltaic system for an electronic appliance |
EP2290478A1 (fr) * | 2009-09-01 | 2011-03-02 | ETA SA Manufacture Horlogère Suisse | Elément d'habillage pour une montre-bracelet |
JP5482224B2 (ja) * | 2010-01-22 | 2014-05-07 | セイコーエプソン株式会社 | 時計 |
JP5888071B2 (ja) * | 2012-04-02 | 2016-03-16 | カシオ計算機株式会社 | ソーラー発電装置および電子時計 |
JP7098946B2 (ja) * | 2018-02-01 | 2022-07-12 | セイコーエプソン株式会社 | 太陽電池付ムーブメントおよび時計 |
JP6866884B2 (ja) * | 2018-10-04 | 2021-04-28 | カシオ計算機株式会社 | ケース、時計、ケースの製造方法及び時計の製造方法 |
JP7293899B2 (ja) * | 2019-06-19 | 2023-06-20 | セイコーエプソン株式会社 | 時計 |
EP4266133A1 (fr) * | 2022-04-22 | 2023-10-25 | The Swatch Group Research and Development Ltd | Montre comprenant une cellule solaire |
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2003
- 2003-12-16 WO PCT/JP2003/016077 patent/WO2004055605A1/ja active Application Filing
- 2003-12-16 US US10/534,234 patent/US20060050618A1/en not_active Abandoned
- 2003-12-16 CN CNA2003801061197A patent/CN1726438A/zh active Pending
- 2003-12-16 EP EP03778950A patent/EP1574919A4/en not_active Withdrawn
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See also references of EP1574919A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9709959B2 (en) | 2014-06-24 | 2017-07-18 | Citizen Watch Co., Ltd. | Electric timepiece with solar cell |
Also Published As
Publication number | Publication date |
---|---|
US20060050618A1 (en) | 2006-03-09 |
EP1574919A1 (en) | 2005-09-14 |
CN1726438A (zh) | 2006-01-25 |
EP1574919A4 (en) | 2007-12-19 |
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