JPH09269382A - Structure for solar clock display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve appearance quality and product value by providing a pattern layer at the front side of a colored semitransparent substrate of a solar clock display panel and a colored thin film layer at the rear side. SOLUTION: A solar cell 11 is fixed to the front side of a module 4. A solar clock display panel 12 is set at the front side of the solar cell 11. The display panel 12 consists of a colored semitransparent substrate 13 obtained by mixing dyes or pigments to a transparent resin and injection-molding, a pattern layer 14 set at the front side of the substrate 13 and having time characters 20 bonded thereto, and a colored metallic thin film layer 15 of various color gradations which is vapor-deposited at the rear side of the substrate 13. While colors of the substrate 13 and thin film layer 15 are secured, the dark brown or dark blue solar cell 11 and a cross of an insulating band are concealed. Therefore, the display panel can be designed in diversified ways with a fine tone of color, enhanced in appearance quality and product value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar timepiece display plate structure using a solar cell that uses light as energy for a timepiece dial.

[0002]

2. Description of the Related Art Conventionally, solar cells have been used as a power source for clocks, calculators, portable radios and the like. This solar cell is usually formed of amorphous silicon or the like, converts light energy into electric energy, and it is necessary to dispose the solar cell at a position where light shines due to its function, that is, a surface position directly visible from the outside.

As shown in FIGS. 9 and 10, when the solar cell is used in the display panel structure of a wristwatch, four fan-shaped solar cells 32 are isolated from each other on the upper surface of the wristwatch module 31 in plan view. The solar cells are arranged with a band 33 in between (in order to obtain a voltage, the solar cells are connected in series), and a transparent plate 34 of transparent polycarbonate or acrylic resin is provided on the solar cell 32 (on this surface, cuts, pets). The name is printed and the time character is fixed.)

However, in the solar timepiece display plate structure as described above, since the solar cells 32 are usually dark brown or dark blue, the display plate has the above-mentioned color, and the solar cell 32 and the solar cell 32 have the same color. Since there is the insulating band 33 between them, the insulating band 33 appears as a cross line, and not only the design including the color tone is greatly limited, but also the commercial property is poor.

On the other hand, there has been proposed a clock or the like in which an interference filter or the like is provided on the front surface of the solar cell so that the solar cell cannot be seen directly. However, it is said that this will hinder the light energy supply to the solar cell. There was a problem and the appearance quality as a timepiece dial was poor.

In order to solve such a problem, for example, Japanese Patent Publication No. 5-38464 discloses a solar cell and a light in a wavelength range provided in front of the solar cell and contributing to power generation of the solar cell. A color diffusion layer including a color filter that transmits light and a scattering layer that is provided between the solar cell and the color filter, and that transmits a part of light transmitted by the color filter and scatters the remainder in four directions; A solar cell is disclosed.

When the scattering layer is a white diffusing plate, an acrylic milky white plate, a half mirror coated with a matte clear lacquer, a glass with one surface roughened, or aluminum on the other side of the plastic is used as a mirror. It has been shown to use the one formed with.

[0008]

However, in the above-mentioned conventional technique, the acrylic milk-white plate is preferred as the display plate of a wristwatch, and it is not possible to obtain a metallic color tone capable of imparting a high-class feeling. Also, for half mirrors coated with matte clear lacquer, and for mirrors formed of aluminum or the like on the opposite side of glass or plastic with one surface roughened, the unevenness of the film thickness causes variations in transmittance and There was a problem that unevenness occurred. Further, any of the above materials has a problem that the appearance quality as a dial of a timepiece is inferior.

The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to greatly improve design variations including high-grade patterns and color tones (subtle shades). Another object of the present invention is to provide a display structure for a solar timepiece that is not only enlarged, but also has an improved appearance quality and contributes to increasing the marketability.

[0010]

In order to achieve the above-mentioned object, a solar clock display panel structure according to the invention of claim 1 is a solar clock display panel structure provided on the front side of a solar cell. The timepiece display plate is composed of a colored semitransparent substrate that transmits light, a pattern layer provided on the front side of the colored semitransparent substrate, and a colored thin film layer provided on the back side of the colored semitransparent substrate. Is characterized by.

With this structure, of the light incident on the colored semitransparent substrate, light in a wavelength range of a system different from the color of the colored semitransparent substrate is absorbed by the colored semitransparent substrate. Part of the light in the same wavelength range as the color of the colored semi-transparent substrate passes through the colored thin film layer to reach the solar cell, contributes to the power generation of the solar cell, and the rest is reflected toward the surface. This is because the colored thin film layer is an extremely thin thin film, and therefore has a function of transmitting part of light and reflecting the rest.

Although the light reflected by the colored thin film layer is directional and non-uniform, the pigment or dye and the pattern layer mixed in the colored semitransparent substrate diffuse the light and reach the eyes of the observer. Therefore, the entire surface of the colored semi-transparent substrate is visually recognized by the observer with the delicate shade in which the color of the colored thin film layer is uniformly combined with the color of the colored semi-transparent substrate as a base. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as an ordinary display board can be realized, and not only the design variation including a high-quality pattern and color tone is greatly expanded. A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

In order to achieve the above object, the solar clock display board structure according to the invention of claim 2 is the solar clock display board structure according to claim 1, wherein the colored thin film layer is a metal vapor deposition layer. Is.

With this configuration, of the light incident on the colored semitransparent substrate, light in a wavelength range of a system different from the color of the colored semitransparent substrate is absorbed by the colored semitransparent substrate. Part of the light in the same wavelength range as the color of the colored semi-transparent substrate passes through the metal deposition layer to reach the solar cell, contributes to the power generation of the solar cell, and the rest is reflected toward the surface. This is because the metal vapor deposition layer is an extremely thin thin film, and thus has a function of transmitting part of light and reflecting the rest.

Although the light reflected by the metal vapor deposition layer is directional and non-uniform, the pigment or dye and the pattern layer mixed in the colored semitransparent substrate diffuse the light and reach the eyes of the observer. Therefore, the entire surface of the colored semitransparent substrate is visually recognized by the observer with the delicate color tone of the color of the colored semitransparent substrate being combined with the color of the metal deposition layer uniformly. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as that of a normal display board can be realized, and not only the design variation including a high-grade pattern and color tone can be greatly expanded. A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

In order to achieve the above object, the solar clock display board structure according to the invention of claim 3 is the solar clock display board structure provided on the front side of the solar cell. A transparent substrate through which light is transmitted, a pattern layer provided on the front side of the transparent substrate, a diffusion layer provided on the back side of the transparent substrate, and a colored thin film layer provided on the diffusion layer. It is characterized by

With this configuration, a part of the light incident on the transparent substrate passes through the diffusion layer and the colored thin film layer to reach the solar cell, contributes to the power generation of the solar cell, and the remaining light is transparent. The diffused layer and the colored thin film layer formed on the back surface of the substrate diffusely reflect the surface. This is because the colored thin film layer is an extremely thin thin film, and therefore has a function of transmitting part of light and reflecting the rest. The light diffusely reflected by the diffusion layer and the colored thin film layer is directional and non-uniform, but since it is further diffused (scattered) by the pattern layer formed on the surface of the transparent substrate, the observer is On the entire surface of the transparent substrate, the pattern layer and the color of the colored thin film layer are visually recognized uniformly. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as an ordinary display board can be realized, and not only the design variation including a high-grade pattern and color tone is greatly expanded, A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

Further, in order to achieve the above object, the solar clock display board structure according to the invention of claim 4 is the solar clock display board structure according to claim 3, wherein the transparent substrate and the pattern layer are provided. The diffusion layer was integrally molded.

With such a construction, not only the same operation as the operation of the invention of claim 3 described above can be achieved, but also by forming the transparent substrate, the pattern layer and the diffusion layer integrally, For example, it is possible to form patterns such as Piaget cut and Asahi Hikari, which greatly expands the design variation including high-quality patterns and color tones, which improves the appearance quality and contributes to improving the marketability. .

In order to achieve the above-mentioned object, the display structure for a solar timepiece according to the invention of claim 5 is the display structure for a solar timepiece according to claim 3 or 4, wherein the colored thin film layer is provided. Is a metal vapor deposition layer.

With this structure, a part of the light incident on the transparent substrate passes through the diffusion layer and the metal vapor deposition layer to reach the solar cell, contributes to the power generation of the solar cell, and the remaining light is transparent. The diffusion layer and the metal deposition layer formed on the back surface of the substrate diffusely reflect the surface. This is because the metal vapor deposition layer is an extremely thin thin film, and therefore has a function of transmitting part of light and reflecting the rest. The light diffusely reflected by the diffusion layer and the metal vapor deposition layer is directional and non-uniform, but since it is further diffused (scattered) by the pattern layer formed on the surface of the transparent substrate, the observer is On the entire surface of the transparent substrate, the pattern layer and the color of the metal deposition layer are visually recognized uniformly. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as an ordinary display board can be realized, and not only the design variation including a high-grade pattern and color tone can be greatly expanded. A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments (examples) of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIGS. 1 to 5 show the structure of a display plate for a solar timepiece (first embodiment) according to the present invention.
FIG. 1 shows a display structure for a solar timepiece according to the present invention (first
Example) A longitudinal sectional view of a wristwatch equipped with the present invention, FIG. 2 is a configuration explanatory view of a display structure for a solar timepiece according to the present invention (first embodiment), and FIG. 3 is a plan view of the display structure for a solar timepiece. FIG. 4 is a cross-sectional view of the solar timepiece display plate structure with the solar timepiece display plate partially omitted, and FIG. 5 is an explanatory diagram of incoming and outgoing light in the solar timepiece display plate.

As shown in FIG. 1, the wristwatch 1 is provided with a module 4 inside a case 2 via a support frame 3 made of synthetic resin, and a solar clock display board structure A is formed on the front side of the module 4. , The double shafted needle shaft 5 provided in the module 4 is passed through the central hole A1 in the timepiece dial structure A, and the hour hand 6 is attached to the outer shaft 5a of the needle shaft 5 and the inner shaft 5b.
A minute hand 7 is attached to each of the outer hands 2, a back cover 9 is attached to the bottom side of the outer case 2 through a waterproof packing 8, and a windshield 10 is attached to the front side of the outer case 2.

The display structure A for the solar clock
2 is composed of a solar cell 11 fixed to the front side of the module 4 and a solar clock display plate 12 provided on the front side of the solar cell 11, as shown in FIG. This solar watch display plate 12 is a colored semi-transparent substrate 13, a pattern layer 14 provided on the front side of the colored semi-transparent substrate 13, and a colored thin film layer deposited on the back side of the colored semi-transparent substrate 13. And the metal vapor deposition layer 15 of. The time character 20 is fixed to the surface of the pattern layer 14 by adhesion or is formed by printing.

The solar cell 11 has a fan shape in plan view like the conventional solar cell shown in FIG. 9, and four solar cells 11 are arranged with an insulating band interposed therebetween. In addition, the colored semi-transparent substrate 13 is a transparent substrate made of transparent polycarbonate or acrylic resin. When the transparent substrate is molded, pellets in which various pigments or dyes are mixed in the raw material are made, and the pellets are injection-molded to make the colored substrate. It is the one.

The metal vapor deposition layer 15 has a thickness of 50.
It is a colored thin film layer of about 0Å to 5000Å. Various types of metals (Au, Cr, Al, Pt, Ni, Pd, Rh
It is known that thin films having various color tones can be obtained by vapor deposition of (). The metal vapor deposition layer 15 is also formed as a thin film having various color tones according to a known manufacturing method. The metal vapor deposition layer 15 is a single-layer film in which one kind of metal is vapor deposited. Further, a more suitable thickness of the metal vapor deposition layer 15 is 2500Å to 3500Å, and an optimum thickness is 2000Å
3000Å is good. In particular, when the metal vapor deposition film 15 is a Cr vapor deposition layer, the color tone is gray and a light transmittance of 50% or more can be secured in the wavelength region of 500 nm.

The light transmittance is generally determined by the amount of power generated by the solar cell by the light transmitted through the dial for solar cell timepiece. That is, in a device that prevents outside light from entering, the solar cell placed at a certain distance from the light source is illuminated with light, and the current value when light energy is converted to electrical energy is Ao, and the solar cell A dial for a solar cell timepiece is placed on top, and the current value measured in the same manner as above is A ₁ , and A ₁ is expressed as a percentage with respect to Ao. It has been confirmed that when the light transmittance of the display structure A for a solar timepiece is 50% or more, it is possible to generate electricity without any trouble in carrying it on a wrist.

Next, the operation of the solar clock display plate structure A constructed as described above will be described. As described in the related art, since the solar cell 11 is normally brown or dark blue, the display plate is brown or dark blue, and there is an insulating band between the solar cells 11 and 11. , This insulation band appears as a crosshair,
Colored semi-transparent substrate 13 and metal deposition layer 15 which is a colored thin film layer
By securing a delicate color tone with and, the brown or dark blue solar cell 11 and the crosshairs of the insulating band are hidden.

As shown in FIG. 5, among the light rays incident on the colored semitransparent substrate 13, light in a wavelength range of a system different from the color of the colored semitransparent substrate 13 is absorbed by the colored semitransparent substrate 13. Part of the light in the same wavelength range as the color of the colored semi-transparent substrate 13 passes through the metal deposition layer 15 to reach the solar cell 11, contributes to the power generation of the solar cell 11, and the rest is directed to the surface. Is reflected. This is because the metal vapor deposition layer 15 is an extremely thin thin film, and therefore has a function of transmitting part of light and reflecting the rest. Even in the metal vapor deposition layer 15, a very small amount of light transmitted through the colored semitransparent substrate 13 is absorbed.

The light reflected by the metal vapor deposition layer 15 is directional and non-uniform, but the pigment or dye mixed in the colored semi-transparent substrate 13 and the pattern layer 14 diffuse the light and the observer observes it. Reach the eye. Therefore, the observer visually recognizes the entire surface of the colored semitransparent substrate 13 and the pattern layer 14 together with the delicate shade in which the color of the colored semitransparent substrate 13 is uniformly combined with the color of the metal deposition layer 15. To be done. For this,
The dark brown or dark blue solar cell 11 and the crosshairs of the insulating band are transparent and disappear.

For this reason, the design can be diversified and the same design expression as that of an ordinary display board can be realized, and not only the design variation including a high-grade pattern and color tone can be greatly expanded. A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

The colored thin film layer does not necessarily have to be formed by metal vapor deposition, but may be formed by dry plating such as ion plating or sputtering.

(Second Embodiment) FIGS. 6 to 8 show the structure of a display plate for a solar timepiece according to the present invention (second embodiment).
FIG. 6 shows a display structure for a solar timepiece according to the present invention (second
Example) vertical sectional view, FIG. 7 is a sectional view of the solar clock display plate in the solar clock display plate structure with a part of the display plate omitted, and FIG. 8 is an explanatory diagram of incoming and outgoing light of the solar clock display plate. is there.

In the solar clock display board structure A according to the second embodiment, the solar clock display board 12 is
The transparent substrate 16, the pattern layer 17 provided on the front side of the transparent substrate 16, the diffusion layer 18 formed on the back side of the transparent substrate 16, and the metal deposition layer which is a colored thin film layer deposited on the diffusion layer 18. It is composed of 19 and.

The solar cell 11 is placed on the front side of the module 4, and the solar clock display plate 12 is placed on the surface of the solar cell 11 with the pattern layer 17 facing the front side. The time character 20 is fixed on the front side of the pattern layer 17 by adhesion or by printing, as in the first embodiment.

The transparent substrate 16 is formed by injection molding, and the pattern is formed on the mold with random minute irregularities of the pattern die portion and the diffusion layer 18 which form the irregularities of the pattern of the pattern layer 17. Since the uneven portion is provided in advance,
When the transparent substrate 16 is molded by injection molding, the pattern layer 17 is formed on the surface and the diffusion layer 18 is formed on the back side thereof. The pattern layer 17 is formed with a pattern such as Piage cut or Asahi Hikari.

Further, the metal vapor deposition layer 19 is a colored thin film layer having a thickness of about 500Å to 5000Å as in the case of the first embodiment described above. Various kinds of metals (Au, C
It is known that thin films having various color tones can be obtained by vapor deposition of r, Al, Pt, Ni, Pd, Rh, etc.). The metal vapor deposition layer 19 is also formed as a thin film having various color tones according to a known manufacturing method. The metal vapor deposition layer 19 is a single-layer film in which one kind of metal is vapor deposited. A more suitable thickness of the metal vapor deposition layer 19 is 2500Å to 3500.
Å The optimum thickness is 2000Å to 3000Å. Particularly, in the case of the Cr vapor deposition layer, the color tone is gray and
A light transmittance of 50% or more can be secured in the wavelength region of nm.

Next, the operation of the solar clock display panel structure A in the second embodiment constructed as described above will be described.

As shown in FIG. 8, of the light incident on the transparent substrate 16, part of the light is diffused layer 18 and metal vapor deposition layer 19.
And penetrates to reach the solar cell 11 and the solar cell 1
The remaining light that contributes to the power generation of No. 1 is diffusely reflected toward the front surface by the diffusion layer 18 and the metal vapor deposition layer 19 formed on the back surface of the transparent substrate 16. This is because the metal vapor deposition layer 19 is an extremely thin thin film and thus has a function of transmitting a part of light and reflecting the rest. The light b diffused and reflected by the diffusion layer 18 and the metal vapor deposition layer 19 has directivity and is not uniform, but the pattern layer 1 formed on the surface of the transparent substrate 16
Since it is further diffused (scattered) by 7, the entire surface of the transparent substrate 16 can be seen uniformly by the observer by the color of the metal vapor deposition layer 19,
That is, the pattern layer 17 is visually recognized together with the metallic color. Therefore, the brown or dark blue solar cell 11 and the crosshairs of the insulating band are transparent and invisible. In the metal vapor deposition layer 19, a very small amount of the transmitted light is absorbed.

For this reason, the design can be diversified and the same design expression as a normal display board can be realized, and not only the design variation including a high-grade pattern and color tone is greatly expanded, A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

The colored thin film layer does not necessarily have to be formed by metal vapor deposition, but may be formed by dry plating such as ion plating or sputtering.

[0047]

As described above, according to the solar clock display board structure of the invention of claim 1, in the solar clock display board structure provided on the front side of the solar cell, the solar clock display board is , A colored semi-transparent substrate that transmits light, a pattern layer provided on the front side of the colored semi-transparent substrate, and a colored thin film layer provided on the back side of the colored semi-transparent substrate. Of the light incident on the substrate, light in a wavelength range of a system different from the color of the colored semitransparent substrate is absorbed by the colored semitransparent substrate. Part of the light in the same wavelength range as the color of the colored semi-transparent substrate passes through the colored thin film layer to reach the solar cell, contributes to the power generation of the solar cell, and the rest is reflected toward the surface. This is because the colored thin film layer is an extremely thin thin film, so it transmits some light,
This is because it acts to reflect the rest.

The light reflected by the colored thin film layer is directional and non-uniform, but the pigment or dye and the pattern layer mixed in the colored semi-transparent substrate diffuse the light and reach the eyes of the observer. Therefore, the entire surface of the colored semi-transparent substrate is visually recognized by the observer with the delicate color tone of the colored thin film layer based on the color of the colored semi-transparent substrate and the pattern layer. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as a normal display board can be realized, and not only the design variation including a high-quality pattern and color tone can be greatly expanded. A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

According to the solar clock display board structure of the invention of claim 2, in the solar clock display board structure of claim 1, since the colored thin film layer is a metal vapor deposition layer Of the light incident on the transparent substrate,
Light in a wavelength range of a system different from the color of the colored semitransparent substrate is absorbed by the colored semitransparent substrate. Part of the light in the same wavelength range as the color of the colored semi-transparent substrate passes through the metal deposition layer to reach the solar cell, contributes to the power generation of the solar cell, and the rest is reflected toward the surface. This is because the metal vapor deposition layer is an extremely thin thin film, and thus has a function of transmitting part of light and reflecting the rest.

The light reflected by the metal deposition layer is directional and non-uniform, but the pigment or dye and the pattern layer mixed in the colored semitransparent substrate diffuse the light and reach the eyes of the observer. Therefore, the entire surface of the colored semitransparent substrate is visually recognized by the observer with the delicate color tone of the color of the colored semitransparent substrate being combined with the color of the metal deposition layer uniformly. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as an ordinary display board can be realized, and not only the design variation including a high-grade pattern and color tone is greatly expanded, A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

According to the solar clock display panel structure of the invention of claim 3, in the solar clock display panel structure provided on the front side of the solar cell, the solar clock display panel is transparent so that light can pass therethrough. The substrate, the pattern layer provided on the front side of the transparent substrate, the diffusion layer provided on the back side of the transparent substrate, and the colored thin film layer provided on the diffusion layer are incident on the transparent substrate. Out of the light
Part of the light passes through the diffusion layer and the colored thin film layer to reach the solar cell, contributes to the power generation of the solar cell, and the remaining light is formed on the back surface of the transparent substrate by the diffusion layer and the colored thin film layer on the surface. Is diffusely reflected toward. This is because the colored thin film layer is an extremely thin thin film, and therefore has a function of transmitting part of light and reflecting the rest. The light diffusely reflected by the diffusion layer and the colored thin film layer is directional and non-uniform, but since it is further diffused (scattered) by the pattern layer formed on the surface of the transparent substrate, the observer is On the entire surface of the transparent substrate, the pattern layer and the color of the colored thin film layer are visually recognized uniformly. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as a normal display board can be realized, and not only the design variation including a high-quality pattern and color tone is greatly expanded. A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

According to the display structure for a solar timepiece according to the invention of claim 4, in the display structure for a solar timepiece according to claim 3, the transparent substrate, the pattern layer and the diffusion layer are integrally formed. By molding, not only the same operation as the operation of the invention of claim 3 described above can be achieved, but also by molding the transparent substrate, the pattern layer and the diffusion layer integrally, , Asahi Hikari, etc. can be formed, and design variations including high-quality patterns and color tones are greatly expanded, the appearance quality is improved, and it contributes to the enhancement of commercialability.

According to the solar clock display board structure of the invention of claim 5, in the solar clock display board structure of claim 3 or 4, the colored thin film layer is a metal vapor deposition layer. Due to this, a part of the light incident on the transparent substrate passes through the diffusion layer and the metal deposition layer to reach the solar cell, contributes to the power generation of the solar cell, and the remaining light is formed on the back surface of the transparent substrate. The diffused layer and the metal vapor deposition layer thus diffused and reflected toward the surface. This is because the metal vapor deposition layer is an extremely thin thin film, and therefore has a function of transmitting part of light and reflecting the rest. The light diffusely reflected by the diffusion layer and the metal vapor deposition layer is directional and non-uniform, but since it is further diffused (scattered) by the pattern layer formed on the surface of the transparent substrate, the observer is On the entire surface of the transparent substrate, the pattern layer and the color of the metal deposition layer are visually recognized uniformly. For this reason, the brown or dark blue solar cells and the crosshairs of the insulating band are not visible.

For this reason, the design can be diversified and the same design expression as a normal display board can be realized, and not only the design variation including a high-grade pattern and color tone is greatly expanded, A subtle color tone can be produced, the appearance quality is improved, and it contributes to the enhancement of the marketability.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a wrist watch provided with a display structure for a solar timepiece according to the invention (first embodiment).

FIG. 2 is a structural explanatory view of a display plate structure for a solar timepiece (first embodiment) according to the present invention.

FIG. 3 is a plan view of the display panel structure for the solar timepiece.

FIG. 4 is a cross-sectional view in which a portion of the display plate for a solar timepiece in the display plate structure for a solar timepiece is omitted.

FIG. 5 is an explanatory diagram of incoming and outgoing light of the display plate for the solar timepiece.

FIG. 6 is a vertical cross-sectional view of a solar panel display plate structure (second embodiment) according to the present invention.

FIG. 7 is a cross-sectional view in which a part of the solar timepiece display plate in the solar timepiece display plate structure is omitted.

FIG. 8 is an explanatory diagram of incoming and outgoing lights in the display structure for a solar timepiece.

FIG. 9 is a plan view of a wristwatch provided with a conventional solar clock display panel structure.

FIG. 10 is a structural explanatory view of a display structure for a conventional solar timepiece.

[Explanation of symbols]

 11 Solar cell 12 Display for solar clock 13 Colored semi-transparent substrate 14 Pattern layer 15 Metal deposition layer (colored thin film layer)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriyuki Totsuka 6-12 Hommachi Honmachi, Tanashi City, Tokyo Citizen Watch Co., Ltd. Tanashi Factory

Claims (5)

[Claims] 1. A solar clock display panel structure provided on the front side of a solar cell, wherein the solar clock display panel is provided with a colored semitransparent substrate through which light is transmitted, and a pattern provided on the front side of the colored semitransparent substrate. A display panel structure for a solar timepiece comprising a layer and a colored thin film layer provided on the back side of the colored translucent substrate. 2. The display board structure for a solar timepiece according to claim 1, wherein the colored thin film layer is a metal vapor deposition layer. 3. A solar clock display panel structure provided on the front side of a solar cell, wherein the solar clock display panel comprises a transparent substrate through which light is transmitted, a pattern layer provided on the front side of the transparent substrate, and A display panel structure for a solar timepiece, comprising a diffusion layer provided on the back side of a transparent substrate and a colored thin film layer provided on the diffusion layer. 4. The display board structure for a solar timepiece according to claim 3, wherein the transparent substrate, the pattern layer and the diffusion layer are integrally molded. 5. The display structure for a solar timepiece according to claim 3, wherein the colored thin film layer is a metal vapor deposition layer.