WO2003060613A1

WO2003060613A1 - Photovoltaic watch and production method for reflection plate used in photovoltaic watch

Info

Publication number: WO2003060613A1
Application number: PCT/JP2003/000275
Authority: WO
Inventors: Tomoo Ikeda
Original assignee: Citizen Watch Co., Ltd.
Priority date: 2002-01-16
Filing date: 2003-01-15
Publication date: 2003-07-24

Abstract

A photovoltaic watch characterized by comprising a photovoltaic element for converting light into electric energy, and a reflection plate having an uneven shape, for condensing reflection light onto the photovoltaic element using the uneven shape. Since reflection light can be condensed onto the photovoltaic element by the reflection plate, the photovoltaic element can be disposed in a position not likely to be recognized from the outside in the photovoltaic watch.

Description

Description Photovoltaic timepiece and method for manufacturing reflector used in photovoltaic timepiece

The present invention relates to a photovoltaic timepiece provided with a photovoltaic element, and more particularly to a photovoltaic timepiece excellent in decorativeness. Background art

Electronic devices using a photovoltaic element having a function of converting light into electric energy as a primary battery include portable electronic devices such as calculators, watches, liquid crystal display devices, and PDAs. In recent years, demand for electronic devices using photovoltaic elements has been increasing because they are less harmful to the environment. The electronic device stores electric energy generated by the photovoltaic element in a secondary battery and drives the electronic device using the stored electric energy. Further, the photovoltaic element has a power generation layer formed of amorphous silicon, an amorphous silicon alloy or microcrystal, crystalline silicon, a compound semiconductor material, or the like. Hereinafter, a photovoltaic clock will be described as an example of an electronic device.

Photovoltaic timepieces convert light into electric energy by means of photovoltaic elements, store the electric energy in a secondary battery such as a nickel-ion battery, extract electric energy from the secondary battery, and move the watch. Drive. In order to drive such a photovoltaic clock for a long period of time, it was necessary to arrange the photovoltaic element at a position where it could be seen from the outside.

However, in general, photovoltaic elements are opaque and have a specific color (eg, purple if the power generation layer is made of amorphous silicon). Therefore, the photovoltaic element can be viewed from outside. There is a problem that the appearance of the clock is impaired if it is placed in the clock.

Therefore, a method of arranging a translucent dial on the photovoltaic element to make the photovoltaic element invisible has been proposed. Fig. 28 shows a cross-sectional view of a conventional photovoltaic watch in which a translucent dial is arranged on the photovoltaic element. In FIG. 28, a module 1500 for driving the hour hand 1400 and a plate-like photovoltaic element 1002 are arranged in a watch case 1700. The photovoltaic element 102 generates power by the incident light from the windshield 1060. Part of the incident light from the windshield is shielded by the translucent dial 1800. However, due to the light shielding effect of the windshield, the photovoltaic element 102 is hard to recognize from the outside.

In addition, a method has been proposed in which a photovoltaic element is arranged on a wall provided upright on the outermost periphery of the dial to make the photovoltaic element invisible (see, for example, Shokai Sho 58- No. 86592). Fig. 29 shows a cross-sectional view of a conventional photovoltaic clock in which photovoltaic elements are arranged on the wall provided at the outermost periphery of the dial. In FIG. 29, a module 1500 for driving the hour hand 1400 and a dial 1900 are arranged in a watch case 1700. The photovoltaic element 1021 is arranged on the inner wall surface of the watch case 11070 that defines the outermost circumference of the dial 1900, and generates electricity by incident light from the windshield 1960. Do. Therefore, unless viewed obliquely through the windshield, the photovoltaic element 102 cannot be recognized from the outside.

Furthermore, a method using a light-guiding prism by applying the method described in FIG. 29 has been proposed (for example, Japanese Utility Model Application Laid-Open No. 59-149888). FIG. 30 shows a sectional view of a conventional photovoltaic timepiece using a light-guiding prism. In Fig. 30, in the watch case 1 070, the module 1 050 and the dial 1 0 9 0 for driving the hour hand 1 0 4 0 are arranged. Have been. The photovoltaic element 1021 is arranged on the inner wall surface of a watch case 1700 that defines the outermost periphery of the dial 1900. The light guide prism 110 is arranged between the windshield 1106 and the dial 1900. The incident light from the windshield 1 60 0 is guided to the photovoltaic element 102 1 by the light guiding prism 110. By the light guiding prism 110, more light can be applied to the photovoltaic element 1021, compared to the case of FIG.

Furthermore, a method has been proposed in which a photovoltaic element is formed on a windshield in a narrow line shape with a fineness that cannot be perceived by human eyes. Figure 31 shows a conventional photovoltaic timepiece in which the photovoltaic element is formed on a windshield in a narrow line shape. In FIG. 31, a dial 190 is arranged between an hour hand 104 and a clock module 110, and a windshield glass 160 is arranged above them. The photovoltaic element 102 is usually formed on the windshield 11060 with such a small size that it cannot be perceived by human eyes. In this case, since the photovoltaic element 102 cannot be recognized, the appearance of the watch is not impaired. Disclosure of the invention

However, the conventional method of arranging a translucent dial on the photovoltaic element reduces the amount of light reaching the photovoltaic element. For this reason, the amount of power generated by the photovoltaic element is reduced, and the driving time of the watch is shortened.

In addition, in the conventional method in which the photovoltaic element is arranged on the outermost peripheral wall surface of the dial, the area where the photovoltaic element can be irradiated with light is reduced. For this reason, there has been a problem that the amount of power generated by the photovoltaic element is reduced, and the driving time of the watch is shortened.

Furthermore, in the conventional method using the light guiding prism, the light guiding prism is used. It merely led the light incident on the light incident surface to the photovoltaic element. Therefore, when the incidence surface of the light-guiding prism is narrow, the amount of power generated by the photovoltaic element is reduced, and the driving time of the timepiece is reduced.

Further, in the conventional method in which the photovoltaic element is formed in a narrow line shape on the windshield, the area where the photovoltaic element can be irradiated with light is reduced. For this reason, there has been a problem that the amount of power generated by the photovoltaic element is reduced, and the driving time of the timepiece is shortened.

Therefore, an object of the present invention is to provide a photovoltaic timepiece capable of irradiating a photovoltaic element with a large amount of light.

It is another object of the present invention to provide a photovoltaic timepiece that can efficiently irradiate a large amount of light to a photovoltaic element, thereby increasing the amount of power generated by the photovoltaic element.

It is a further object of the present invention to provide a photovoltaic clock that can irradiate a large amount of light to the photovoltaic element and does not impair the appearance due to the photovoltaic element.

A further object of the present invention is to provide a manufacturing method capable of manufacturing a reflector for irradiating a photovoltaic element with a large amount of light with high accuracy.

In order to achieve the above object, a photovoltaic timepiece according to the present invention has a photovoltaic element for converting light into electric energy, and a concavo-convex shape, and the reflected light is condensed on the photovoltaic element by the concavo-convex shape. And a reflecting plate that causes the reflection.

Further, it is preferable that the concavo-convex shape is composed of a V-shaped groove or a U-shaped groove, and further has a depth of 5 μπι or more and 500 μm or less, and a depth of 10 μππι or more. 0 0 // It is preferable that the pitch is less than m Further, the reflection plate preferably has a function as a dial. Further, the photovoltaic element preferably has a ring shape. Further, it is preferable that the photovoltaic timepiece has a dial and a clock module formed of a transparent substrate, and the reflector is disposed between the dial and the clock module.

Further, it is preferable that the concavo-convex shape is composed of a plurality of grooves carved at different angles.

Further, it is preferable that the uneven shape is formed of a groove having a curved surface.

Further, it is preferable that the reflection plate is formed by forming a metal film on a base made of a plastic material.

In addition, the photovoltaic clock has a dial made of a transparent substrate.

The photovoltaic element is preferably formed in a narrow line shape with a line width of 200 μm or less on the dial.

Further, it is preferable that the photovoltaic timepiece has a dial and the photovoltaic element is formed at least in part of the dial.

Furthermore, the photovoltaic timepiece preferably has a windshield, and the photovoltaic element is preferably formed on the windshield.

Further, it is preferable that the photovoltaic element has a ring shape, and the photovoltaic element is arranged on the outer peripheral portion of the reflector perpendicular to the reflector.

Further, in order to achieve the above object, a method for manufacturing a reflector used in a photovoltaic timepiece according to the present invention includes a step of forming a processed product having a shape corresponding to the concavo-convex shape by stereolithography; Forming a conductive film on the surface of the conductive film, forming an electrical product having a shape corresponding to the uneven shape on the conductive film by an electro-deposition method, and forming the unevenness by resin molding using the electrical product. Forming a resin molded product having a shape. It is characterized by.

In order to achieve the present invention, it is necessary to prepare a reflector having an uneven shape in order to collect reflected light in one direction. In recent years, processing methods that enable extremely fine and high-precision processing have been developed to manufacture micromachine-related parts. Among them, the electro-machining, electric discharge machining, laser machining, stereolithography, photolithography, Si anisotropic etching, etc. can be processed at the micron level. Therefore, the above-mentioned reflector is manufactured with high accuracy by using these processing methods.

For example, by forming V-shaped grooves (or surfaces) having different angles on the reflector using the above-described processing method, reflected light can be accurately condensed in a very narrow range. This is achieved by forming a large number of V-shaped grooves having different reflection angles and appropriately adjusting each reflection angle. If the photovoltaic element is arranged in an extremely narrow range where the reflected light is collected, the amount of light irradiated per unit area of the photovoltaic element becomes very large, and the photovoltaic element can generate power efficiently. Therefore, even if the photovoltaic element is arranged on the outer peripheral wall surface of the reflector, power can be efficiently generated.

Efficient power generation means that a smaller photovoltaic element can be used to obtain the same power as before. As a result, it has become possible to use photovoltaic elements in the form of narrow and narrow lines that are too thin to be perceived by the human eye.

In addition, if a reflector is used, the photovoltaic element can be arranged at a position that cannot be recognized from the outside of the photovoltaic clock. That is, the reflection plate having the uneven shape allows the reflected light to be condensed on the photovoltaic element arranged at a position that cannot be recognized from the outside. Therefore, it has become possible to manufacture a photovoltaic timepiece having exactly the same design in appearance as a normal timepiece that does not use a photovoltaic element. That is, a photovoltaic timepiece excellent in decorativeness can be manufactured.

The photovoltaic timepiece according to the present invention can provide a photovoltaic timepiece that can be driven for a long time without impairing the decorativeness of the appearance.

According to the photovoltaic timepiece according to the present invention, it is possible to irradiate a large amount of light to the photovoltaic element, so that the power generation amount of the photovoltaic element increases, and as a result, the photovoltaic element can be driven for a longer time than before. It has become possible.

Further, according to the photovoltaic timepiece according to the present invention, the photovoltaic element can generate power with high efficiency, so that a smaller photovoltaic element can be used in order to obtain the same power as before. It became.

Further, according to the photovoltaic timepiece according to the present invention, since the photovoltaic element can be arranged without being recognized, a design design irrespective of the photovoltaic element becomes possible, and the decorativeness of the photovoltaic element is improved. It is now possible.

Further, according to the method for manufacturing a reflector used in a photovoltaic timepiece according to the present invention, it has become possible to manufacture reflectors with high precision and in large quantities. In particular, if the stereolithography method is used, the inclined surface can be formed at an arbitrary angle, so that it is possible to easily form a reflector having an inclined surface having a different angle. Further, if it is possible to form reflectors having inclinations having different angles, it becomes possible to condense light to a certain area better. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram showing a part of a photovoltaic timepiece according to the present invention. 2A is a surface view of the reflector shown in FIG. 1, and FIG. 2B is a cross-sectional view of the photovoltaic timepiece shown in FIG.

Fig. 3 (a) is a surface view of another reflector used in the photovoltaic timepiece according to the present invention, and Fig. 3 (b) is a cross-sectional view of the reflector shown in Fig. 3 (a). is there.

FIG. 4 (a) is a surface view of another reflector used in the photovoltaic timepiece according to the present invention, and FIG. 4 (b) is a sectional view of the reflector shown in FIG. 4 (a).

FIG. 5A is a surface view of another reflector used in the photovoltaic timepiece according to the present invention, and FIG. 5B is a sectional view of the reflector shown in FIG. 5A.

FIG. 6A is a surface view of another reflector used in the photovoltaic timepiece according to the present invention, and FIG. 6B is a cross-sectional view of the reflector shown in FIG. 6A.

FIG. 7 (a) is a surface view of another reflector used in the photovoltaic timepiece according to the present invention, and FIG. 7 (b) is a sectional view of the reflector shown in FIG. 7 (a).

FIG. 8 (a) is a surface view of another reflector used in the photovoltaic timepiece according to the present invention, and FIGS. 8 (b) and 8 (c) are views of the reflector shown in FIG. 8 (a). It is sectional drawing.

FIG. 9 is a diagram showing a relationship between a windshield and a reflector in the photovoltaic timepiece according to the present invention.

FIGS. 10 (a) to 10 (e) are diagrams showing another relationship between the windshield and the reflection plate in the photovoltaic timepiece according to the present invention.

FIG. 11 is a diagram for explaining a method of measuring the depth and pitch of the groove of the reflector used in the photovoltaic timepiece according to the present invention.

FIG. 12 is a configuration diagram showing a part of another photovoltaic timepiece according to the present invention.

FIG. 13 is a diagram showing a part of a cross-sectional view of the photovoltaic timepiece shown in FIG.

FIG. 14 is a configuration diagram showing a part of another photovoltaic timepiece according to the present invention. You.

FIG. 15 is a diagram showing a part of a cross-sectional view of the photovoltaic timepiece shown in FIG.

FIG. 16 is a configuration diagram showing a part of another photovoltaic timepiece according to the present invention.

FIG. 17 is a diagram showing a part of a cross-sectional view of the photovoltaic timepiece shown in FIG.

FIG. 18 is a configuration diagram showing a part of another photovoltaic timepiece according to the present invention.

FIG. 19 is a diagram showing a part of a cross-sectional view of the photovoltaic timepiece shown in FIG.

FIGS. 20 (a) to 20 (b) are diagrams showing a method of manufacturing the reflector shown in FIG.

FIG. 21 is a diagram schematically showing an optical forming apparatus.

FIGS. 22 (a) and 22 (b) are views showing a process of forming a processed product by the stereolithography method.

FIGS. 23 (a) and 23 (b) are diagrams showing the process of forming the electrical appliance.

Figures 24 (a) to 24 (c) show the process of forming a molded product.

FIGS. 25 (a) to 25 (d) are diagrams showing the process of forming a caroet product by photolithography.

FIGS. 26 (a) and 26 (b) are diagrams showing a process of forming a processed product by the Si anisotropic etching method.

FIGS. 27 (a) to 27 (e) are views showing a method of manufacturing the reflector shown in FIG.

FIG. 28 is a diagram showing an example of a conventional photovoltaic timepiece. FIG. 29 is a diagram showing another example of a conventional photovoltaic timepiece.

FIG. 30 is a diagram showing another example of a conventional photovoltaic timepiece.

FIG. 31 is a diagram showing another example of a conventional photovoltaic timepiece. Embodiment of the Invention

FIG. 1 is a configuration diagram showing a part of a photovoltaic timepiece according to the present invention. FIG. 1 shows a reflector 10 serving also as a dial, a ring-shaped power generating element 20, an hour hand 40, and a timepiece module 50. In the present embodiment, the reflector 10 is disposed between the hour hand 40 and the module 50, and the ring-shaped photovoltaic element 20 is disposed on the outermost periphery of the reflector 10. The light receiving surface of the ring-shaped photovoltaic element 20 is arranged perpendicular to the surface of the reflector 12.

In FIG. 1, characters are not drawn on the surface of the reflector 10, but characters are actually drawn on the surface of the reflector 10. The reflector 10 serving also as a dial has a function of reflecting reflected light in one direction. Light incident from the outside is condensed on the light receiving surface of the ring-shaped photovoltaic element 20 by the reflector 12.

The module 50, which is the main component of the watch, consists of a secondary battery for storing electric energy generated by the photovoltaic element 20, a crystal oscillator that accurately oscillates the frequency, and a gear for transmitting power. Etc. The power from the module 50 is transmitted to the hour hand 40 via the drive shaft.

FIG. 2A is a surface view of the reflector 10 and the photovoltaic element 20 shown in FIG. FIG. 2 (b) shows the photovoltaic timepiece shown in FIG. 1, and shows a cross section of AA in FIG. 2 (a).

As shown in FIG. 2 (b), the inside of the photovoltaic clock 1 is sealed by a windshield 60, a case 70 and a back cover 72. Inside the photovoltaic clock 1, an hour hand 40, a reflector 10 serving as a dial, a movement 50, a substrate 74, a photovoltaic element 20, a facing ring 76, and a fixing member 78 are housed. The facing ring 76 is a transparent ring-shaped member, and is provided to protect the photovoltaic element 20. The fixing member 78 is provided for fixing the photovoltaic element 20.

As shown in FIG. 2A, four V-shaped grooves are provided concentrically on the surface of the reflector 10. The reflecting plate 10 includes a base 110 made of a plastic material and a metal film 120 formed on the base 110. The surface of the metal film 120 is mirror-finished. Therefore, the light reflected by the V-shaped groove is reflected in a direction different from the incident direction according to the angle of the V-shaped groove. Each V-shaped groove has a different angle, and as shown in the figure, is configured so that the reflected light from each V-shaped groove is focused on the light receiving surface of the photovoltaic element 20. ing.

Light incident on the photovoltaic element 20 through the windshield 60 from the outside of the photovoltaic clock is condensed on the photovoltaic element 20. The power generation efficiency of 20 was improved. In addition, since the photovoltaic element 20 is arranged at a position where it is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decoration without impairing the appearance of the watch. It became.

The material used for the metal film 120 can be selected from noble metals such as gold and platinum, and metal materials used in general timepieces such as titanium and aluminum. In the present embodiment, since gold was used as the material of the metal film 120, a photovoltaic timepiece with extremely excellent decorativeness could be manufactured. in this way. One of the features of the present embodiment is that a photovoltaic timepiece excellent in decorativeness can be manufactured without causing the photovoltaic element 20 to be recognized.

FIG. 3 shows another reflector 11 that can be used in the photovoltaic timepiece 1 according to the present invention. Fig. 3 (a) is a surface view of another reflector 11 and FIG. 3B is a sectional view taken along the line AA ′ in FIG. 3A. In FIG. 3 (b), components other than the reflector 11 and the photovoltaic element 20 are omitted. On the surface of the reflector 11, 18 V-shaped grooves are provided in the vertical direction on the drawing. The angle of each V-shaped groove is the same. As shown in FIG. 3 (b), the light incident through the windshield 60 (not shown) is reflected or scattered by each V-shaped groove, and is condensed on the photovoltaic element 20. ing. As a result, the light irradiating the photovoltaic device 20 increased, and the power generation efficiency of the photovoltaic device 20 could be improved. In addition, since the photovoltaic element 20 is arranged at a position that is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decorativeness without impairing the appearance of the watch. became.

FIG. 4 shows another reflector 12 that can be used in the photovoltaic timepiece 1 according to the present invention. FIG. 4A is a surface view of another reflector 12, and FIG. 4B is a cross-sectional view taken along AA in FIG. 4A. In FIG. 4B, components other than the reflection plate 12 and the photovoltaic element 20 are omitted. As shown in Fig. 4 (a), on the surface of the reflector 12, a small area 12a provided with a plurality of V-shaped grooves in the vertical direction and a plurality of V-shaped grooves were provided in the horizontal direction. A plurality of small areas 1 2b are arranged in a grid. The angle of each V-shaped groove is the same. As shown in FIG. 4 (b), the light incident through the windshield 60 (not shown) is reflected or scattered by each V-shaped groove, and is condensed on the photovoltaic element 20. ing. As a result, the light irradiating the photovoltaic element 20 increased, and the power generation efficiency of the photovoltaic element 20 could be improved. In addition, since the photovoltaic element 20 is arranged at a position where it is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decorativeness without impairing the appearance of the watch. I got it. '

FIG. 5 shows another example of the photovoltaic timepiece 1 according to the present invention. The reflector 13 is shown. FIG. 5 (a) is a surface view of another reflector 13 and FIG. 5 (b) is a cross-sectional view along AA in FIG. 5 (a). In FIG. 5B, components other than the reflection plate 13 and the photovoltaic element 20 are omitted. As shown in FIG. 5 (a), a plurality of small square pyramids 13a having a rounded upper portion are arranged on the surface of the reflecting plate 13 adjacent to each other in the vertical and horizontal directions. As shown in Fig. 5 (b), the light incident through the windshield 60 (not shown) is reflected or scattered by each V-shaped groove and condensed on the photovoltaic element 20. Have been. As a result, the light irradiated on the photovoltaic element 20 increased, and the power generation efficiency of the photovoltaic element 20 could be improved. In addition, since the photovoltaic element 20 is arranged at a position that is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decorativeness without impairing the appearance of the watch. It became. FIG. 6 shows another reflecting plate 14 that can be used in the photovoltaic timepiece 1 according to the present invention. FIG. 6A is a surface view of another reflector 14, and FIG. 6B is a cross-sectional view along AA in FIG. 6A. In FIG. 6B, components other than the reflection plate 14 and the photovoltaic element 20 are omitted. As shown in FIG. 6A, nine V-shaped grooves are provided concentrically on the surface of the reflecting plate 14. The angle of each V-shaped groove is the same. As shown in FIG. 6 (b), the light incident through the windshield 60 (not shown) is reflected or scattered by each V-shaped groove, and is condensed on the photovoltaic element 20. ing. As a result, the light irradiating the photovoltaic device 20 increased, and the power generation efficiency of the photovoltaic device 20 could be improved. In addition, since the photovoltaic element 20 is disposed at a position that is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decorativeness without impairing the appearance of the watch. became.

FIG. 7 shows another reflector 15 that can be used in the photovoltaic timepiece 1 according to the present invention. Fig. 7 (a) is a surface view of another reflector 14 and FIG. 7B is a cross-sectional view taken along the line AA in FIG. In FIG. 7B, components other than the reflection plate 15 and the photovoltaic element 20 are omitted. As shown in FIG. 7 (a), on the surface of the reflection plate 15, a plurality of waveforms formed of V-shaped grooves are provided concentrically. The angle of each V-shaped groove is the same. As shown in FIG. 7 (b), light incident through the windshield 60 (not shown) is reflected or scattered by each V-shaped groove, and is condensed on the photovoltaic element 20. ing. As a result, the light irradiating the photovoltaic element 20 increased, and the power generation efficiency of the photovoltaic element 20 could be improved. In addition, since the photovoltaic element 20 is located at a position that is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decorativeness without impairing the appearance of the watch. And

FIG. 8 shows another reflector 16 that can be used in the photovoltaic timepiece 1 according to the present invention. 8 (a) is a surface view of another reflector 16; FIG. 8 (b) is a cross-sectional view of AA in FIG. 8 (a); FIG. 8 (c) is a BB in FIG. 8 (a). FIG. 8 (b) and 8 (c), components other than the reflector 16 and the photovoltaic element 20 are omitted. As shown in FIG. 8 (a), a plurality of V-shaped grooves are provided on the surface of the reflector 16 radially from the center of the reflector 16. The angle of each V-shaped groove is the same. As shown in FIG. 8 (c), the light incident through the windshield 60 (not shown) is reflected or scattered by each V-shaped groove, and condenses on the photovoltaic element 20. It is configured. As a result, the light irradiated on the photovoltaic element 20 increased, and the power generation efficiency of the photovoltaic element 20 could be improved. In addition, since the photovoltaic element 20 is arranged at a position where it is difficult to recognize from the outside of the watch, it is possible to provide a photovoltaic element with excellent decorativeness without impairing the appearance of the watch. Was FIG. 9 shows a front view of a photovoltaic timepiece 1 according to the present invention. In FIG. 9, a crown 80 is provided on the side of the case 70, and a circular windshield 60 with a radius of R mm is fitted in the center of the case 70. Further, a circular area 65 having a radius of r mm indicates an area where the reflector is provided. As described above, by providing the reflection plates 10 to 16, light is condensed on the photovoltaic element 20, and the power generation efficiency of the photovoltaic element 20 can be improved. However, if the reflector does not have a sufficient area for the opening of the windshield 60, light cannot be sufficiently focused on the photovoltaic element. In the photovoltaic timepiece 1 according to the present invention, a part of the reflector or the whole is in the region of the inner side of the radius r = 0. 8 R, and the area of the reflector of the windshield area (π Ι ²⁾ When it was 30 to 100%, the power generation efficiency of the photovoltaic element 20 could be improved as compared with the conventional method.

FIGS. 10 (a) to 10 (e) show other examples showing the relationship between the windshield 60 and the region 65 where the reflector is provided. In FIGS. 10 (a) to 10 (e), 'R indicates the radius of the windshield 60, and r indicates 0.8R. As shown in the figure, the reflector can have various shapes as long as it is located in the area inside the radius r and has an area of 30 to 100% of the area of the windshield.

FIGS. 2 to 8 show reflectors 10 to 16 using V-shaped grooves. However, in the photovoltaic timepiece 1 according to the present invention, not only the V-shaped groove but also a reflector formed by another groove can be used. Figure 11 shows examples of other groove shapes. In Fig. 11, 90 is an 11-shaped groove, 91 is a semi-cylindrical groove, 92 is a two-step inclined groove, 93 is a two-step inclined mountain groove, 94 is a trapezoidal groove, and 95 is V. It is a groove. In the reflectors 10 to 16 described above, the grooves 90 to 94 shown in FIG. 11 can be used instead of the V-shaped grooves. In addition, the depth D of the groove formed in the reflector is preferably 5 μm or more and 500 μm or less in order to effectively focus light on the photovoltaic element 20. When the groove depth D is larger than 500 μππι, the inclination angle of the groove becomes steep (especially, when the depth is 500 μm, the maximum pitch is 200 μm and the depth is 500 μm, it becomes almost vertical), and the reflection It is difficult to obtain the effect as a plate. If the depth D of the groove is smaller than 5 μm, it becomes difficult to recognize the groove, and the decorativeness deteriorates. The groove depth D is the distance from the surface of the reflector to the deepest part of the groove. Further, when grooves having a plurality of depths are formed, the average value of the depths of all the grooves is defined as the depth D of the corresponding reflector.

Further, the pitch P of the grooves provided in the reflector is preferably 10 μππ or more and 200 μππ or less in order to effectively focus light on the photovoltaic element 20. If the pitch Ρ is coarse (greater than 200 μm), the decorativeness deteriorates, and if the pitch P is narrow (smaller than 10 μm), interference colors occur and the desired hue cannot be obtained, resulting in decorativeness. Gets worse. Pitch P refers to the distance from the center axis of a given groove to the center axis of an adjacent groove. When grooves having different pitches are provided, the average value of the respective pitches is set as the corresponding reflector pitch P.

FIG. 20 shows an example of a method for manufacturing the reflection plate 10 shown in FIG.

First, a stainless steel material is processed by an electric discharge machining method to form a processed product 500 shown in FIG. 20 (a). The electric discharge machining method is a method of machining a material by electric discharge energy generated in a very small area. The features of EDM are that extremely fine shapes can be machined with high precision, and that the machined surface has less surface roughness. Therefore, by using the electric discharge machining method, a mirror-finished machining surface can be obtained. 'In the processed product 500 shown in Fig. 20 (a), V-grooves could be machined according to the prescribed design dimensions with a high dimension system of several micron levels. In addition, instead of electric discharge machining, laser machining, X-ray A fine processing method such as a processing method can also be used. By using such a fine machining method, a V-shaped groove can be machined with a high dimensional accuracy of several micron levels, as in the case of the electric discharge machining method.

Next, the processed product 500 was used as a mold, and a molded product 110 made of a plastic material was formed by an injection molding method (FIG. 20 (b)). Next, the base 110 was formed by peeling the molded product 110 from the processed product 500 (FIG. 20 (c)). By using the injection molding method, it is possible to form a large number of bases 110 having the same shape, thereby improving productivity.

Next, a metal film 120 was formed by sputtering on the side of the base 110 where the V-shaped groove was provided (FIG. 20 (d)). The metal film was made of gold (Au) force and had a thickness of 0.2 Atm. Through such a process, the reflector 10 was completed.

Next, an example in which the base of the reflection plate is formed by using an optical molding method will be described with reference to FIGS.

FIG. 21 shows an outline of the optical shaping apparatus 600. The optical head 612 is fixed to the tip of the optical head fixing section 610. The light beam 6 16 emitted from the light head 6 12 is focused on a predetermined position by the lens 6 14. The XY-direction drive unit 62 holds the XY stage 622 movably in the XY direction. The resin container 628 is fixed on the XY stage 622. The Z-direction drive unit 624 is fixed in a resin container 628, and holds the Z stage 626 so as to be movable in the Z direction (up and down directions).

The control unit 650 controls the light head 612 according to the focus signal 652 to expose a predetermined position of the liquid photosensitive resin 640 in the resin container 628. . In addition, the control unit 65 0 receives the XY drive signal 6 54 and the Z drive signal 6 56 from the XY drive unit 6 20 and the Z drive unit 6 2 4 is controlled, and the position on the Z stage exposed by the light head 6 12 is three-dimensionally controlled. The exposed liquid photosensitive resin 640 is hardened, and a desired three-dimensional structure 644 is formed on the Z stage 626.

Fig. 22 shows the process of forming a processed product for manufacturing a reflector by stereolithography. FIG. 22 (a) shows a state in which the lower part of the model 642 is formed, and FIG. 22 (b) shows a state in which the entire model 642 is formed. As described above, in the stereolithography, a molded object is formed by laminating the cured resin from the lower layer toward the upper layer. The formed object 642 formed in this way is used as a processed product 200 of the reflection plate.

Next, FIG. 23 shows a process of forming an electrical product 300 from the processed product 200 formed by the stereolithography method.

First, a conductive film 210 is formed on the surface of the processed product 200 (FIG. 23 (a)). The conductive film 210 is a Ni film formed by electroless Ni plating.

Next, an electrical component 300 is formed on the conductive film 210 (FIG. 23 (b)). The electrical product 300 was formed by applying a current to the Ni film 210 and performing an Ni electrical treatment. In the present embodiment, the electrodeposition was performed for 6 hours at a current density of 1.3 AZdm2 in a nickel sulfamate plating solution at 50 ° C.

Finally, the electrical product 300 is separated from the processed product 200 (FIG. 23 (c)).

Next, FIG. 24 shows a process of forming a resin molded product 410 from the electrical product 300.

First, a resin material 400 is filled between the electric appliance 300 and the electric mold 310 (FIG. 24 (a)). Next, heat is applied to the power mold 310. Then, the resin is compressed by applying pressure to form a resin molded product 410 (FIG. 24 (b)). Thereafter, the resin molded product 410 is separated from the electric product 300 and the electric mold 310 (FIG. 24 (c)). The formed resin molded product 410 can be used as a base of a reflection plate. As shown in FIG. 20 (d), the base thus formed becomes a reflector with a metal film formed on the surface.

As described above, a processed product 200 is formed by stereolithography (see FIG. 22), an electronic product 300 is formed by an electroforming method (see FIG. 23), and an electronic product 300 is formed. By forming a resin molded product 410 by using a resin (see FIG. 24), it is possible to form a large number of bases having the same shape, thereby improving productivity. In particular, since the stereolithography method can freely set the angle of the groove of the processed product 200, it is extremely effective in forming the base of the reflector.

Next, a process of forming a processed product by photolithography will be described with reference to FIG.

First, a photo resist 222 is coated on the substrate 222 (FIG. 25 (a)). Next, a mask 222 on which a light-shielding film is added on a transparent substrate is arranged above the photo resist 222, and exposure is performed (FIG. 25 (b)). The exposed position of the photo resist 222 is cured, and the unexposed position is not cured. Therefore, by performing an appropriate developing process, the uncured photoresist 222 can be removed and a primary processed product 228 can be formed (FIG. 25 (c)). Next, a heat treatment is performed to complete the processed product 230 (FIG. 25 (d)).

In the same manner as the processed product 200 by the stereolithography method, it is possible to form a resin molded product using the processed product 230 by the photo resist method. In this case, an electrical product is formed by an electrical method using the processed product 230 (see Fig. 23), and a resin molded product is formed using the electrical product. (See Figure 24).

Next, the process of forming a processed product by the Si anisotropic etching method will be described with reference to FIG.

First, the Si substrate 240 is sandwiched between the first protective film 242 and the second protective film 244 (FIG. 26 (a)). In the present embodiment, since the groove is formed only in the upper part in the figure, it has a shape corresponding to the groove formed only by the second protective film 244. Next, wet etching (dipping method) is performed with a 30% 011 aqueous solution (70 ° C) (Fig. 26 (b)). The etching rate was set to 0.7 / zm / min. After the completion of the etching treatment, the first and second protective films are peeled off to obtain a processed product 250 (FIG. 26 (c)).

In the same manner as the processed product 200 by the stereolithography described above, a resin molded product can be formed by using the processed product 250 by the Si anisotropic etching method. In this case, an electrical product is formed by an electrical method using the processed product 250 (see FIG. 23), and a resin molded product is formed using the electrical product (see FIG. 24). ). With the Si anisotropic etching method, grooves can be formed only in a line shape or a grid shape.However, it can be mass-produced because resin is molded using electrical components. Become.

As described above, at least the base of the reflective film according to the present invention is required to form a workpiece by the electric discharge machining method and a molding by the injection molding method using the workpiece as a mold (FIG. 2). 0).

2. Molding of processed products by stereolithography (see Fig. 22), formation of electrical products by the electroforming method using processed products (see Fig. 23), and formation of resin molded products by using electrical products (See Figure 24).

3. Molding of processed products by photolithography (see Fig. 25), formation of electrical products by electroforming using processed products (see Fig. 23) Forming resin moldings using, and electrical appliances (see Figure 24).

4. Molding of processed products by Si anisotropic etching method (see Fig. 26), formation of electric products by processed electric products (see Fig. 23), and resin using electric products It can be formed by the four methods of forming a molded article (see Fig. 24).

FIG. 12 is a configuration diagram showing a part of another photovoltaic timepiece according to the present invention. Figure 12 shows the reflector 17, the transparent substrate 30, the ring-shaped power generation element 21 attached to one side of the transparent substrate 30, the hour hand 40, and the clock module 50. Have been. In the present embodiment, the reflector 17 is disposed between the module 50 and the transparent substrate 30 on which characters are written.

The photovoltaic element 20 is formed with a very fine line width (20 μπι). It cannot be recognized by human eyes. The reflection plate 17 has a function of condensing the reflected light in one direction. The light transmitted through the transparent substrate 30 is reflected by the reflector 17 and is collected by the photovoltaic element 21. In the photovoltaic timepiece according to the present embodiment, the dial 31 is constituted by the reflector 17, the photovoltaic element 21, and the transparent substrate 30.

FIG. 13 is a sectional view of the dial 31 shown in FIG. The light transmitted through the transparent substrate 30 is reflected by the reflector 17. On the surface of the reflector 10, four V-shaped grooves are provided concentrically. The reflection plate 10 is composed of a substrate 112 made of a plastic material and a metal film 122 formed on the substrate 112. The surface of the metal film 122 is mirror-finished. Therefore, the light reflected by the V-shaped groove is reflected in a direction different from the incident direction according to the angle of the V-shaped groove. Each V-shaped groove has a different angle. As shown, the configuration is such that the reflected light of each V-shaped groove is focused on the light receiving surface of the photovoltaic element 21.

The light transmitted through the transparent substrate 30 is condensed on the photovoltaic element 21 by the reflector 17 to increase the amount of light irradiated on the photovoltaic element 21, and the power generation efficiency of the photovoltaic element 21 The point that this is improved over the conventional photovoltaic clock is a major feature of the present embodiment.

Also, in the present embodiment, the photovoltaic element 21 is formed with a very narrow width (20 μm), and cannot be recognized by human eyes. However, the line width that cannot be perceived by ordinary people is said to be 200 μηι. Therefore, the line width of the photovoltaic element 21 is preferably 200 μm or less. Further, from the viewpoint of manufacturing, the line width of the photovoltaic element 21 is more preferably 1 μπι or more.

The material used for the metal film 122 can be selected from noble metals such as gold and platinum, and metal materials used for general watches such as titanium and aluminum. In the present embodiment, since gold was used as the material of the metal film 122, a photovoltaic timepiece with extremely excellent decorativeness could be manufactured. in this way. Another feature of the present embodiment is that a photovoltaic timepiece with excellent decorativeness can be manufactured without causing the photovoltaic element 21 to be recognized.

The reflector 17 in this embodiment can be manufactured by the same method as the reflectors 10 to 16 described above.

FIG. 14 is a configuration diagram showing a part of still another photovoltaic timepiece according to the present invention. FIG. 14 shows the reflector 17, a ring-shaped non-transparent substrate 35 mounted above the outer periphery of the reflector 17, and the lower surface of the non-transparent substrate 35 (reflectors 17 and 17). A ring-shaped power generating element 22, an hour hand 40, and a clock module 50 mounted on the front face are described. In this embodiment, a reflector 17 is disposed between the hour hand 40 and the module 50. I have. In the present embodiment, the reflection plate 17 also functions as a dial. The reflector 17 has a function of condensing the reflected light in one direction. Light incident from the outside is reflected by the reflector 17 and is collected on the photovoltaic element 22. In the photovoltaic timepiece according to the present embodiment, the photovoltaic element 22 is blinded by the non-transparent substrate 35 and cannot be recognized from the outside.

FIG. 15 is a sectional view of a part of the photovoltaic timepiece shown in FIG. Light incident from the outside is designed to be reflected by the reflector 17 and to be focused on the light receiving surface of the photovoltaic element 22. In the present embodiment, the same reflector 17 as the reflector 17 shown in FIGS. 12 and 13 was used.

Also in the present embodiment, by condensing the incident light on the photovoltaic element 22 by the reflection plate 17, the amount of light irradiated on the photovoltaic element 22 is increased, and the power generation efficiency of the photovoltaic element 22 is improved. It could be improved over the conventional photovoltaic clock. In addition, a photovoltaic timepiece excellent in decorativeness could be manufactured without causing the photovoltaic element 22 to be recognized.

FIG. 16 is a configuration diagram showing a part of still another photovoltaic timepiece according to the present invention. FIG. 16 shows a reflector 17, an hour hand 40, a clock module 50, and a windshield 60. On the back side of the windshield 60 (the inside of the watch), a photovoltaic element 23 is formed in a ring shape with a width of 20 μm. Since the photovoltaic element 23 is formed very thin, it cannot usually be perceived by human eyes. In the present embodiment, a reflector 17 is arranged between the hour hand 40 and the module 50. In the present embodiment, the reflection plate 17 also functions as a dial. Further, the reflection plate 17 has a function of condensing the reflected light in one direction. Light incident from the outside is reflected by the reflector 17 and is collected on the photovoltaic element 23.

FIG. 17 is a cross-sectional view of a part of the photovoltaic timepiece shown in FIG. Windshield Light incident from outside via the lath 60 is designed to be reflected by the reflector 17 and to be condensed on the light receiving surface of the photovoltaic element 23. In this embodiment, the same reflector as the reflector 17 shown in FIGS. 12 and 14 was used.

Also in this embodiment, the incident light is reflected by the photovoltaic

By condensing the light on the photovoltaic element 23, the amount of light irradiated on the photovoltaic element 23 was increased, and the power generation efficiency of the photovoltaic element 23 could be improved as compared with the conventional photovoltaic clock. Further, a photovoltaic timepiece excellent in decorativeness and excellent in decorativeness could be manufactured without recognizing the photovoltaic element 23.

FIG. 18 is a configuration diagram showing a part of still another photovoltaic timepiece according to the present invention. FIG. 18 shows a reflector 18, a transparent substrate 30, a photovoltaic element 24 attached to one surface of the transparent substrate 30, an hour hand 40, and a clock module 50. . In the present embodiment, the reflection plate 18 is disposed between the transparent substrate 30 on which characters are written and the module 50. The photovoltaic elements 24 are formed in parallel with a very fine line width (20 μm) on one surface of the transparent substrate 30 and cannot be recognized by human eyes. . Further, the reflection plate 18 has a function of condensing the reflected light in one direction. The light transmitted through the transparent substrate 30 is reflected by the reflector 18 and is collected on the photovoltaic element 24. In the photovoltaic timepiece according to the present embodiment, the dial 32 is constituted by the reflector 18, the photovoltaic element 24, and the transparent substrate 30.

FIG. 19 is a cross-sectional view of dial 32 shown in FIG. Transparent substrate

The light transmitted through 30 is reflected by the reflector 18. Six U-shaped grooves are provided on the surface of the reflector 18. The reflection plate 18 is composed of a substrate 114 made of a plastic material and a metal film 124 formed on the substrate 114. The surface of the metal film 124 is mirror-finished. Therefore, the light reflected by the U-shaped groove is U The light is reflected in a direction different from the incident direction according to the angle of the groove wall surface of the groove. In the present embodiment, one row of the photovoltaic elements 24 corresponds to one U-shaped groove. The reflected light from each U-shaped groove is configured to be focused on one row of the photovoltaic element 24.

Also in the present embodiment, the amount of light applied to the photovoltaic element 24 is increased by condensing the incident light on the photovoltaic element 24 by the reflection plate 18, and the power generation efficiency of the photovoltaic element 24 is conventionally reduced. It was better than the photovoltaic clock. In addition, a photovoltaic timepiece excellent in decorativeness could be manufactured without recognizing the photovoltaic element 24.

FIG. 27 shows a method of manufacturing the reflector 18.

First, a conductive substrate 260 in which a gold (Au) film is formed on a glass plate to a thickness of 0.1 is prepared. Next, on the conductive substrate 2 6 0, alumina (A 1 ₂ O ₃₎ non-conductive film 2 7 0 consisting of at 0. 2 mu thickness of m, so as to correspond to the reflecting plate 1 8, Perform patterning (Figure 27 (a)). In the present embodiment, a pattern was formed in a narrow line shape having a width of 20 μπι such that the conductive substrate 260 was exposed. In the present embodiment, a re-off method is used for patterning the non-conductive film 270. The lithography method is a method that uses photographic technology to remove only unnecessary portions of a thin film, and is widely used in the LSI field. There is no limitation on the thickness of the non-conductive film 270 as long as electrical insulation is ensured.

Next, nickel (Ni) power was applied while a current was flowing through the conductive substrate 260 to form a power component 280 made of Ni (Fig. 27 (b)). The Ni electrode is one type of the Ni plating method, and is a method of forming a structure by the Ni plating method. In the present embodiment, the electrode member 280 was mecically grown from the surface of the non-conductive film 270 to a height of 80 xm by the Ni electrode. The cross section of the electrical member 270 is the curvature It has an arc shape that includes a curved surface part with a constant curvature of radius 80 μππι. In general, the curvature is defined as the point at each point on a curve or a curved surface.

, Means the degree of curving of a curve or surface, and means the radius of a circle passing through two points on a curve or surface.

In the present embodiment, the height from the surface of the non-conductive film 270 to the upper surface of the electrode member 280 and the radius of curvature of the cross section of the electrode member 280 always have the same value. This is because the plating growth of the Ni electrode progresses isotropically. In the present embodiment, at 5 0 ° Surufua Mi phosphate Nikkerume luck solution of C, 1. 3 Ri by the current density of AZ dm ^2, it was Den錶for 6 hours.

Next, a base 114 made of a plastic material was formed on the electrode material 280 by using a general molding method (FIG. 27 (c)).

Next, the electrode member 280, the non-conductive film 270 and the conductive substrate 260 were peeled off from the substrate 114 (FIG. 27 (d)). Thus, a base having six U-shaped grooves was obtained. The electrode member 280, the non-conductive film 270 and the conductive substrate 260 from which the base 114 has been separated can be used to repeatedly form a base.

Finally, a metal film 124 made of a chromium (Cr) film with high light reflectance was formed on the side of the base 114 where the groove was formed (Fig. 27 (e)). . With the conventional cutting method, it was not possible to form a curved surface having a minute radius of curvature such as 80 m. However, according to the present manufacturing method, a very small radius of curvature of about 1 μm is obtained by adjusting the height from the non-conductive film 270 to the upper surface of the electrode member 280. It is even possible to form curved surfaces. The accuracy is also very high at the micron level.

Further, in the present embodiment, a mirror surface could be formed without polishing. This is because the electro-deposition method makes the electrode material uniform at the molecular level. This is because the surface of the electrode member 280 is in a mirror state. Since polishing is not required, the process has been simplified and productivity has been improved.

In the present embodiment, a substrate in which an _Au film is formed on the surface of a glass plate is used as the conductive substrate 260, but a stainless steel (SUS) plate, a copper

A substrate made of a conductive material itself, such as a (Cu) plate or a titanium (Ti) plate, can also be used. Further, a substrate in which a thin film made of a conductive material is formed on a plastic plate can be used.

In the present embodiment, as a non-conductive film 2 7 0, alumina (A 1 ₂ O a) but using silicon oxide (S i O _2), titanium oxide (T i O _2), and oxide Jirukoniumu Oxides such as (ZrO ₂ ) and organic photosensitive materials such as negative resist and positive resist can also be used. In the present embodiment, the lift-off method is used as the pattern jung method of the non-conductive film 270. However, the etching method, the photolithography method, the screen printing method, and the masking method are used. The law can also be used.

In the present embodiment, Ni is used for the electroplating method, but any material that can be formed by the electroplating method can be used. For example, copper (Cu), cobalt (Co), tin (Sn), gold (Au), platinum (Pt), and alloys thereof can be used.

If the reflecting plate 18 manufactured according to the present embodiment is used, the photovoltaic element 24 is irradiated with light from all directions, and the power generation efficiency can be improved. In addition, by irradiating light from all directions, it is possible to prevent partial deterioration of the photovoltaic element 24.

That is, the method of manufacturing the reflector 18 includes a step of forming a non-conductive film on the conductive substrate in a pattern that partially exposes the conductive substrate, and a step of forming an electrode on the portion where the conductive substrate is exposed. Treated to a thickness greater than the thickness of the non-conductive film A step of forming an electrode member on a conductive substrate; and a step of transferring a shape of the electrode member to form a molded article.

Further, in the present production method, the structural material of the molded article is preferably a plastic material.

Further, the present manufacturing method preferably further includes a step of forming a metal film on the surface of the molded article.

Further, in the present production method, it is preferable that the structural material of the molded article is a transparent material. By using a transparent material for the structural material of the molded product, a micro lens can also be manufactured.

Claims

The scope of the claims

1. In the photovoltaic clock,

A photovoltaic element that converts light into electrical energy, and

A photovoltaic timepiece having a concave and convex shape, and a reflector for condensing reflected light on the photovoltaic element by the concave and convex shape.

2. The photovoltaic timepiece according to claim 1, wherein the concavo-convex shape comprises a V-shaped groove, a U-shaped groove, a semi-cylindrical groove, a two-step inclined groove-shaped groove, or a two-step inclined mountain-shaped groove.

3. The photovoltaic timepiece according to claim 1, wherein the reflector has a function as a dial.

4. The photovoltaic timepiece according to claim 1, wherein the photovoltaic element has a ring shape.

5. The photovoltaic timepiece according to claim 1, further comprising a clock face and a clock module formed of a transparent substrate, wherein the reflection plate is disposed between the clock face and the clock module.

6. The photovoltaic timepiece according to claim 1, wherein the concavo-convex shape comprises a plurality of grooves carved at different angles.

7. The photovoltaic timepiece according to claim 1, wherein the concavo-convex shape is constituted by a groove having a curved surface.

8. The photovoltaic timepiece according to claim 1, wherein the reflector is formed by forming a metal film on a base made of a plastic material.

9. The device according to claim 1, further comprising a dial formed of a transparent substrate, wherein the photovoltaic element is formed on the dial in a narrow line shape with a line width of 200 μm or less. Light power clock.

10. The photovoltaic timepiece according to claim 1, further comprising a dial, wherein the photovoltaic element is formed in at least a part of the dial.

1 1. The photovoltaic timepiece according to claim 1, further comprising a windshield, wherein the photovoltaic element is formed on the windshield.

1. The photovoltaic device according to claim 1, wherein the photovoltaic device has a ring shape, and the photovoltaic device is disposed on an outer peripheral portion of the reflector and perpendicular to the reflector. clock.

1 3. The V-shaped groove, U-shaped groove, semi-cylindrical groove, two-step inclined groove or two-step inclined mountain-shaped groove are formed at a depth of 5 / m or more and 5Ο Ομπι or less. 3. The photovoltaic timepiece according to claim 2, wherein:

1 4. The V-shaped groove, U-shaped groove, semi-cylindrical groove, two-step inclined groove shape or two-step inclined mountain-shaped groove are formed at a pitch of 10 μπι or more and 200 m or less. 3. The photovoltaic timepiece according to claim 2, wherein:

1 5. The above-mentioned V-shaped groove, U-shaped groove, semi-cylindrical groove, two-step inclined groove-shaped groove or two-step inclined mountain-shaped groove are configured concentrically, side by side, lattice-shaped, wavy or radial. The photovoltaic timepiece according to claim 2, wherein

1 6. Furthermore, it has a substantially circular windshield with a radius R, and a part or all of the reflector is inside a region having a radius of 0.8R, 30% or more of the area of the windshield and 1 The photovoltaic timepiece according to claim 1, having an area of 0 ◦%.

17. The method according to claim 1, further comprising: a ring-shaped non-transparent substrate disposed on an outer peripheral portion of the reflector, wherein the photovoltaic element is formed on the reflector side of the non-transparent substrate. A photovoltaic clock according to claim 1.

1 8. A manufacturing method for manufacturing a reflection plate for condensing reflected light by means of an uneven shape with respect to a photovoltaic element provided in a photovoltaic timepiece. A process of forming a workpiece having a corresponding shape,

Forming a conductive film on the surface of the processed product,

A shape corresponding to the uneven shape is formed on the conductive film by an electro-optical method. Forming an electrical product having:

Forming a resin molded product having the convex shape by resin molding using the electronic product.

19. The method for manufacturing a reflector according to claim 18, further comprising a step of forming a metal film on the surface of the molded article.

20. The manufacturing method of the reflection plate according to claim 18, wherein the concave-convex shape is formed of a V-shaped groove, a U-shaped groove, a semi-cylindrical groove, a two-step inclined groove-shaped groove or a two-step inclined mountain-shaped groove. Method.

21. The method for manufacturing a reflection plate according to claim 18, wherein the uneven shape is constituted by a plurality of grooves cut at different angles.

22. The method for manufacturing a reflector according to claim 18, wherein the concave-convex shape is formed of a groove having a curved surface.

23. The V-shaped groove, U-shaped groove, semi-cylindrical groove, two-step inclined groove-shaped groove or two-step inclined mountain-shaped groove have a depth of 5 μm or more and 500 μm or less. A method for manufacturing a reflector according to claim 20.

24. The V-shaped groove, U-shaped groove, semi-cylindrical groove, two-step inclined groove or two-step inclined mountain-shaped groove are formed at a pitch of 10 / m or more and 200 μππ or less. A method for manufacturing a reflector according to claim 20.

25. The V-shaped groove, U-shaped groove, semi-cylindrical groove, two-step inclined groove shape or two-step inclined mountain-shaped groove are configured in concentric, parallel, lattice, wavy, or radial form. A method for manufacturing a reflector according to claim 20.