JP2002286867A - Disk for clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk for a solar cell driven clock, which is of a simple structure and which has attractive appearance. SOLUTION: Hemispherical recesses 1a are formed dense all around in a matrix form on the rear surface of the dial 1 for the clock, which is arranged and installed on a solar cell and which is composed of an optically transparent material. Light, which is transmitted through the dial 1 so as to reach the solar cell is reflected by the solar cell, the reflected light is scattered when it is transmitted through the recesses on the rear surface side of the dial or through protrusions on the surface side, and the scattered light is emitted from the dial. The shape of the recesses or the protrusions is not limited to a hemispherical shape or a quadrangular pyramid shape, it may be other arbitrary polygonal pyramid shapes having light-scattering function, or it may be a conical shape. Size b of each base part is formed in the range of 5 to 100 μm. According to this shape, the reflected light from the solar cell is scattered so as to be emitted to the surface of the dial, and the deep purple color of the solar cell becomes hardly noticeable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece dial, and more particularly to a timepiece dial driven by a solar cell.

[0002]

2. Description of the Related Art A solar cell 5 for a watch driven by a solar cell.
1 is generally provided on four surfaces (A1, A2, A3, A4) divided into four equal parts as shown in FIG. 9, and is disposed on the lower surface side of the dial 61 as shown in FIG. . Then, it is necessary that the amount of transmitted light from the dial 61 is sufficiently radiated to the solar cell 51. Therefore, the material of the dial 61 is selected to have a good light transmittance, and a transparent or translucent flat plate having no pattern on the upper and lower surfaces, or a material having a pattern on the upper or lower surface is used. As the color tone of the dial 61, white or other bright color tone is often used.

[0003]

However, since the dial used in any case is light-transmissive, the appearance is not good due to the dark purple color of the solar cell placed on the lower surface. In particular, the white type is a big problem because the white color looks gray instead of beautiful white and the appearance is poor.

The above-mentioned invention has been made to solve such a conventional problem, and an object of the invention is to provide a dial for a solar cell driven timepiece having a simple structure and good appearance.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention relates to a timepiece dial used by being arranged on a solar cell.
A hemispherical, polygonal pyramidal, or conical convex or concave portion is provided on at least one surface of the dial.

According to a second aspect of the present invention, the convex portion is provided on an upper surface of the dial, and the concave portion is provided on a lower surface of the dial.

According to a third aspect of the present invention, the convex portion or the concave portion is mirror-finished.

According to a fourth aspect of the present invention, the base portion of the convex portion or the concave portion is not less than 5 μm and not more than 100 μm.

A fifth aspect of the present invention is characterized in that the timepiece dials according to any one of the first to fourth aspects are stacked.

The invention according to claim 6 is characterized in that the convex portion and the concave portion of the dial have different shapes on the upper and lower surfaces of the dial.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A timepiece dial according to an embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial sectional view of a timepiece dial according to a first embodiment of the present invention, FIG. 2 is a partial sectional view of a timepiece dial according to a second embodiment of the present invention, and FIG. FIG. 4 is a partial cross-sectional view of a timepiece dial according to a fourth embodiment, FIG. 4 is a partial cross-sectional view of a timepiece dial according to a fourth embodiment, and FIG. FIG. 6 is a partial sectional view of a timepiece dial according to a sixth embodiment, FIG. 7 is a partial sectional view of a timepiece dial according to a seventh embodiment, and FIG. It is a fragmentary sectional view of a timepiece dial which is an embodiment.

First, the configuration of a timepiece dial according to an embodiment of the present invention will be described. In FIG. 1, reference numeral 1 denotes a timepiece dial made of a light-transmitting material disposed on a solar cell. On the lower surface of the dial 1, hemispherical concave portions 1a are densely formed in a matrix and formed on one surface. In FIG. 2, reference numeral 2 denotes a similar dial, and a quadrangular pyramid-shaped recess 2 a is formed on the lower surface of the dial 2 in the same manner as the dial 1. FIG.
Reference numeral 3 denotes a similar dial, and hemispherical convex portions 3b are densely formed on one surface of the upper surface of the dial 3.

In FIG. 4, reference numeral 4 denotes a similar dial.
A quadrangular pyramid-shaped projection 4b is formed on the upper surface of the dial 4 in the same manner as the dial 3. 5, reference numeral 5 denotes a similar dial, and a hemispherical convex portion 5b is provided on the upper surface of the dial 5,
On the lower surface, hemispherical concave portions 5a are formed densely. Further, the convex portion 5b and the concave portion 5a are arranged so that their positions do not overlap with each other in the plane direction.

In FIG. 6, reference numeral 6 denotes a similar dial.
A quadrangular pyramid-shaped convex portion 6b is formed on the upper surface of the dial 6 and a quadrangular pyramid-shaped concave portion 6a is formed on the lower surface of the dial 6 in the same manner as the dial 5. In FIG. 7, reference numeral 7 denotes a similar dial, in which a quadrangular pyramid-shaped convex portion 7b is formed on the upper surface of the dial 7 and a hemispherical concave portion 7a is formed on the lower surface of the dial 7 in the same manner as the dial 5. I have. As another embodiment, there is an embodiment in which the shapes of the convex portion and the concave portion are interchanged.

In FIG. 8, reference numeral 8 denotes an example of a dial having four light-scattering layers, which is a combination of two dials 5 to 7 each having two light-scattering layers. This is a dial 8 in which two dials 5 are stacked. As another embodiment of a double-faced dial, as a dial having three light-scattering layers, one of the dials is any one of dials 1 to 4 having a single light-scattering layer, The other dial may be one of dials 5 to 7 having two light scattering layers. Further, in any of the above dials, the surface of the concave portion or the convex portion may be finished to a mirror surface. The size of the concave portion or the convex portion described above is such that the base dimension b is set to 5 μm or more and 100 μm or less.

Next, the operation of these embodiments will be described. Light that has passed through the dial 1 to the dial 4 and reached the solar cell is reflected by the solar cell, but the reflected light is scattered when transmitted through a concave portion on the lower surface side or a convex portion on the upper surface side of the dial. The resulting and scattered light is emitted from the dial. Even if there is light that partially reflects on the lower surface of the dial and does not reach the solar cell, the solar cell can generate a sufficient amount of power as long as the dial has a light transmittance of 20% or more. The shape of the concave portion or the convex portion is not limited to a hemispherical shape or a quadrangular pyramid, but may be any other polygonal pyramid having a light scattering function, or may be a conical shape. If the base dimension b is less than 5 μm, fabrication becomes difficult, and if it is more than 100 μm, the shape of the concave portion or the convex portion becomes visible, which is not preferable in appearance. Such a planar spread of the concave portion or the convex portion on the dial has a function as a light scattering layer.

The reflected light transmitted through the dials 5 to 7 and reaching the solar cell passes through the two light scattering layers, so that the degree of light scattering is further increased. Further, when the shape of the convex portion or the concave portion is different between the upper and lower portions as in the dial 7, or when the arrangement position of the convex portion or the concave portion is shifted vertically, the reflected light is more irregularly scattered, which is preferable. . In the dial 8, the reflected light of the solar cell passes through the four light scattering layers, and light scattering occurs even more strongly. In the case of a double-faced dial having three light-scattering layers, the reflected light is also strongly scattered. When the surface of the convex portion or the concave portion is mirror-finished in each of the dials described above, a dial having an appearance quality in which a glittering appearance appears can be obtained.

The effect of the embodiment of the present invention will be described. In the case of the dials 1 to 4, the reflected light of the solar cell is scattered by the concave portions or the convex portions, so that the transparent dial is not affected by the dark green color. In the case of a white dial, it looks completely white and has a good appearance. In the case of the dials 5 to 7, the number of light scattering layers is increased to two, so that the solar cell is less affected by the solar cells. The transparent dial is no longer affected by the dark green color of the solar cell. In the case of the dial 8, the number of light scattering layers is increased to four, so that it becomes more complete. In the case of a dial having a concave or convex surface with a mirror-finished surface, a dial with good appearance and good appearance with glittering glitter is obtained.

[0019]

As described above, according to the present invention,
Since the dial made of a light-transmitting material disposed on the solar cell is densely formed on at least one surface, the convex portion is formed on the upper surface and the concave portion is formed on the lower surface. The dark purple color of the cell is no longer noticeable.

Further, since the dials having the concave portions or the convex portions are used in an overlapping manner, the light scattering effect is further obtained, and the effect of the solar cell is hardly affected.

Further, since the size of the concave portion or the convex portion is set so that the width of the base is 5 μm or more and 100 μm or less, the light scattering effect can be sufficiently obtained and the appearance specification is not affected at all.

Furthermore, since the surface of the concave portion or the convex portion was finished to a mirror surface, a dial plate having a brilliant appearance and a good appearance was obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a timepiece dial according to a first embodiment of the invention.

FIG. 2 is a sectional view of a main part of a timepiece dial according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a timepiece dial according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a timepiece dial according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a timepiece dial according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a timepiece dial according to a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a timepiece dial according to a seventh embodiment of the invention.

FIG. 8 is a sectional view of a main part of a timepiece dial according to an eighth embodiment of the present invention.

FIG. 9 is a plan view of a solar cell.

FIG. 10 is a sectional view of a main part showing a conventional timepiece dial.

[Explanation of symbols]

 1, 2, 3, 4, 5, 6, 7, 8 Dial 1a, 2a, 5a, 6a, 7a Recess 3b, 4b, 5b, 6b, 7b Convex b Base dimension

Claims (6)

[Claims] 1. A timepiece dial used by being arranged on a solar cell, wherein a hemispherical, polygonal pyramidal, or conical convex or concave portion is provided on at least one surface of the dial. Clock dial. 2. The timepiece dial according to claim 1, wherein the convex portion is provided on an upper surface of the dial, and the concave portion is provided on a lower surface of the dial. 3. The timepiece dial according to claim 1, wherein said convex portion or said concave portion is mirror-finished. 4. The base size of the convex portion or the concave portion is 5
The timepiece dial according to any one of claims 1 to 3, wherein the timepiece is not less than μm and not more than 100 μm. 5. A timepiece dial, comprising two timepiece dials according to any one of claims 1 to 4. 6. The timepiece dial according to claim 1, wherein the convex portion and the concave portion of the dial have different shapes on upper and lower surfaces of the dial.