JPS6230266B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a timepiece dial by plating metal on a timepiece dial substrate made of a non-conductive material such as precious stone, glass, or ceramic.

Dials made mainly of precious stones have been made for a long time. A typical conventional example is shown in the perspective view of FIG. A dial substrate 1 made of a precious stone such as a tiger's eye stone is adhesively fixed to a back plate 2 made of brass. Although not shown, the back plate 2 generally has two legs. Board 1
A scale 3 and letters 4 are printed on the top surface. With such conventional dials, because the dials are simply printed, there is no metallic shine on the dials, and the pressure applied during the printing process causes the precious stones to crack, resulting in very poor yields.

The present invention was made by focusing on the above-mentioned drawbacks of conventional dial plates, and its main purpose is to improve the appearance of raised letters and scales with a metallic shine, as well as precious stones with patterns. The main purpose is to realize a dial based on precious stones, and a secondary purpose is to increase the yield especially when the substrate is made of precious stones.

The gist of the invention is as described in the claims.

The present invention will be explained below based on the drawings. FIG. 2 is a sectional view with the back plate omitted, and the first metal layer 5 is formed on the substrate 1 using precious stones. This metal layer 5 can be easily obtained, for example, by vacuum deposition of chromium. Next, a non-conductive resist film 6 is formed on the upper surface of the metal layer 5 by a photoresist method or the like. Next, electricity is applied from the ends of the metal layer 5, etc., and the second metal layer 7 is formed by electroplating on the portion where the resist film 6 is not present. The second metal layer 7 is preferably made of gold, nickel, rhodium, palladium, or the like. After that, the resist film 6
is removed, and the metal layer 5 is further etched to form a structure as shown in FIG. The second metal layer 7 may be corroded to some extent during the etching process, but since it is much thicker than the first metal layer 5, the effect is extremely small.

Furthermore, if the first and second metal layers are formed of different metals as described in claim 2, by selecting an appropriate etching solution, only the first metal layer 5 will be corroded. You can make it happen.

Note that the first metal layer under the second metal layer 7 is of course not corroded.

According to the present invention as described above, it is possible to obtain a dial plate made of precious stones or glass that has raised letters with a metallic shine, scales, etc. Furthermore, in the case of a dial using precious stones, the yield is improved.

Note that the first and second metal layers may be multilayered.
Furthermore, it goes without saying that the use of a substrate formed by wrapping a coating film on a metal plate also falls within the scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional dial plate;
FIG. 3 is a sectional view of a dial plate for explaining the present invention. DESCRIPTION OF SYMBOLS 1... Dial board substrate, 2... Back plate, 5... First metal layer, 6... Resist film, 7... Second metal layer.

Claims (1)

[Claims] 1. On the substrate of a watch dial made of a non-conductive material,
After forming the first metal layer, a resist film is formed on a part of the upper surface of the metal layer, and a second metal layer is formed by electroplating on the part where there is no resist film,
A method for manufacturing a watch dial, which comprises thereafter peeling off the resist film and etching the first metal layer. 2. The method for manufacturing a timepiece dial according to claim 1, wherein the first metal layer is a metal layer of a different type from the second metal layer.