JPH09274085A - Dial plate for timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dial plate giving a feel of material the same as that in a conventional type by applying at least one type of a stripe pattern, a radiation mesh pattern, a diffraction lattice pattern, geometrical pattern, a pictorial pattern and the like having respective colors as pattern and further specifying the transmittance of light of a transmitting dial plate with the pattern applied to a specified percentage to form a colored pattern which is conventionally impossible to make. SOLUTION: A light transmitting dial plate 4 is made up of a flat plate made of a glass-reinforced epoxy resin, looks semi-transparently white and a stripe pattern 5 presenting silver attributed to metal is formed on the top surface thereof by evaporation. Moreover, a hour character 6 presenting black is formed being printed by a printing method and the transmittance of light through the entire light transmitting dial plate is about 35%. The semi-transparent white of the light transmitting dial plate lest a solar cell have a tinge of light purple in appearance and the part of the cell is entirely dispersed into very narrow vertical linear areas. Thus, the light purple part becomes almost inconspicuous and makes one to perceive the presence of the solar cell.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece dial having a solar cell.

[0002]

2. Description of the Related Art Conventionally, in a timepiece having a solar cell,
Due to the unique dark purple color of the solar cells, the dial's appearance appeared dark and never comfortable. For this reason, various devised techniques have emerged to enhance its aesthetic appearance. Light-transmitting translucent dials colored with white, yellow, blue, etc., translucent dials with a satin finish to roughen and cloud the surface, and JP-A-7-2.
The technology disclosed in the 44174 issue is one of them.
Japanese Unexamined Patent Publication No. 7-244174 discloses that a coating member made of ceramics is provided on a solar cell, and various shapes such as steps, grooves, and recesses are formed on the back surface of the ceramic so that the solar cell cannot be seen and designed. It is a fluffy and aesthetically pleasing one.

[0003]

However, the prior art is a translucent dial plate having a single color, so that the dark purple shade of the solar cell is erased, and the tone of the single color is also in terms of color tone. It was a plate. In addition, even if a pattern is formed, only a very simple pattern can be formed, and the number of types is also small, and it is very inferior in terms of aesthetics and design compared to conventional watches. It was a dial with no realm to feel the existence of. The present invention has been made in view of the above problems, and an object of the present invention is to form various patterns having colors such as a stripe shape, a radial shape, a diffraction grating shape, a geometric shape, and other patterns so that the sun It is to provide a dial which makes the battery invisible and feels the same texture as a conventional dial for a watch.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a timepiece dial comprising a solar cell and a light-transmitting dial which transmits light having letters, a pattern, etc. formed thereon.
Characterized by applying at least one type of stripe pattern, radial pattern, diffraction grating pattern, geometric pattern, pattern pattern, etc., each of which has a color,

Further, it is characterized in that the translucent dial having the above-mentioned pattern has a light transmittance of at least 35%.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION On the surface of a translucent dial, stripes and radiating eyes each having a color by a method such as a vapor deposition method, a plating method or a printing method within a range of at least 35% of light transmittance. Pattern, a diffraction grating pattern, a geometric pattern, or a pattern such as a picture having various shades.

[0007]

Embodiments of the present invention will be described with reference to FIGS. 1 to 3 and Table 1. 1 and 2 show a dial according to the first embodiment of the present invention. 1 is a top view of a dial according to the first embodiment of the present invention, and FIG. 2 is a sectional view thereof. A solar cell layer 3 is formed on a substrate 2 having a foot 1, and a translucent dial 4 having a striped pattern 5 is formed on the solar cell layer 3 to complete a timepiece dial. The translucent dial plate 4 of this embodiment is formed of a glass-containing epoxy resin flat plate, has a semi-transparent white color tone, and has a light transmittance of 80%. This transparent dial 4
A stripe pattern 5 of metal silver is formed on the upper surface by a vapor deposition method over an area of 55%, and a black hour character 6 is printed by a printing method. It is 35%.

In the dial plate, since the translucent dial plate is white and translucent, the solar cell has a pale mauve color in appearance, and the colored portion is very narrow in the vertical line. The area is dispersed over the entire area, and the silver stripe pattern that is evenly distributed over 55% of the area is visible in a very conspicuous form, so that the part with a light mauve color is hardly noticeable, At first glance, the dial does not make you feel the presence of solar cells.

FIG. 3 is a top view of the dial according to the second embodiment of the present invention. A solar cell layer was formed on the substrate in the same manner as in Example 1,
A transmissive dial 4 having a radial pattern is formed on it to form a completed dial. The translucent dial plate 4 is formed of a transparent acrylic resin flat plate having a light transmittance of 98%,
On the lower surface side, a radial pattern 7 made of a metal and having a gold color is formed by a vapor deposition method over an area of 64% of the lower surface, and further, an hour character 8 having a black color is formed by printing. The light transmittance of the entire translucent dial plate is about 35%.

In the dial plate of Example 2, the dark purple part of the solar cell is partially visible in the wide gap portion of the radial pattern, but the radial pattern having a bright gold color is more visible. Since it feels very conspicuous in a wide range, the dark purple part which is recognized in a very small area and dispersed becomes almost inconspicuous, and at first glance, it is visually recognized as a timepiece having no presence of solar cells. Further, in this embodiment, since the pattern is formed on the lower surface side of the transparent resin plate, the pattern is visually perceived as if it is raised, and a three-dimensional effect is felt.

In each of the above-mentioned two embodiments, one kind of pattern is formed, but two or more kinds of patterns are formed when the light transmittance of the entire translucent dial is at least 35%. May be Further, in the embodiment, the pattern is formed on only one side of the translucent dial, but the pattern may be formed on both sides.

Next, Table 1 is a table in which various patterns are formed on the translucent dial and the light transmittance is varied to see the start-up result of the timepiece. Light transmittance of 25%, 30%, 35%, 40%, 4
It was changed to 5% and 50%, and the start of the clock at that time was indicated as ◯ when it was in conformity with the internal standard, and as x when it failed. The light transmittance is 100% of the electromotive force when no obstacle is placed on the solar cell, and the electromotive force when the patterned translucent dial is placed on the solar cell is the ratio ( %), And the ratio (%) was defined as the light transmittance. From Table 1, light transmittances of 25% and 30% were judged to be unacceptable because the electromotive force for starting the watch was not reached within the specified time value, and those of 35% or more were judged to be acceptable.

[0013]

[Table 1]

By forming a pattern on the translucent dial, light is reflected by the pattern and the transmittance of light deteriorates. Although the light transmittance decreases as the area of the pattern formed increases, it was found from the above-mentioned experiment that the light transmittance is allowed up to 35%. The present invention creates various designs by forming various patterns over a large area within a light transmittance of at least 35%.

[0015]

As described above, according to the present invention, by setting the light transmittance to be at least 35%, it is possible to form various colored patterns which could not be achieved until now, and it is almost the same as the conventional timepiece dial. It is possible to provide a dial that feels the texture. In addition, a wide variety of designs can be provided.

[Brief description of drawings]

FIG. 1 is a top view of a dial according to a first embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a top view of a dial according to the second embodiment of the present invention.

[Explanation of symbols]

 1 foot 2 substrate 3 solar cell layer 4 translucent dial 5 stripe pattern 6 o'clock 7 radiation eye pattern 8 o'clock

Claims (2)

[Claims] 1. A dial for a timepiece, comprising a solar cell and a light-transmitting dial for transmitting light on which letters, patterns, etc. are formed, wherein the pattern includes a striped pattern and a radial pattern. , A dial for a watch characterized by having at least one kind of a diffraction grating pattern, a geometric pattern, a picture pattern, and the like. 2. The timepiece dial according to claim 1, wherein the translucent dial having the pattern has a light transmittance of at least 35%.