JPS59136496A - Dial plate for wristwatch - Google Patents

Abstract

PURPOSE:To develop two different color tones, by forming the films of two kinds of Group-IVa or Va metals in Periodic Table on the surface of a dial plate, and anodically oxidizing said films. CONSTITUTION:A titanium coating film 2 is vapor deposited on the surface of a metallic dial plate 1, and resist ink 3 is applied onto a part of said surface by printing and cured by ultraviolet irradiation. Thereafter, tantalum 4 is vapor deposited, and the substrate 1 is immersed in a stripping agent to peel off the resist ink 3. By anodically oxidizing this substrate 1, the anodically oxidized coating films 5, 6 of the titanium and tantalum parts are colored to light blue and yellow tones, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a wrist watch dial with decorative surface waves M''k.

Conventionally, the surface of a watch dial has been colored by painting, wet plating, or the like. However, these methods limit the colors and make it difficult to create variety in the N1 design.

On the other hand, methods have been developed in recent years to completely develop color in metal materials themselves. Metals in the 4α and 5α groups of the periodic table, such as titanium, zirconium, tantalum, and niobium, can be fully formed with an oxidation wave film on their surfaces by anodic oxidation, and can be beautifully colored by the interference effect. However, the use of this type of material as a dial material is problematic for both technical and economical reasons. As a means to solve this problem, 1. nickel silver,
The surface of the dial made of brass has tantalum, zirconium,
It is possible to use a method in which titanium, niobium, etc. are formed as a film on the dial surface by vapor deposition, ion-blating niobium, etc., and this 2"L is anodized to develop color. This method allows easy oxidation treatment. A colored dial plate can be obtained. However, this method has the disadvantage that the dial plate has a single color tone over the entire surface, and it is not possible to produce a dial plate having two or more color tones.

The present invention aims to eliminate this drawback by utilizing the coloring produced by the rough anodizing treatment and to provide a dial having two beautiful tones.

That is, by forming two types of metal films on the dial surface and anodizing them, two different colors are produced depending on the type of metal. In this method, first, the surface of a metal dial substrate is coated with a material of group 4α or 5α of the periodic table, such as titanium, niobium, zirconium, or tantalum, by vapor deposition, ion blasting, sputtering, etc., and then the metal coating is Resist ink is completely printed on a portion of the film and cured. Furthermore, a metal different from the above-mentioned coating metal from Group 4a or Group 5α of the periodic table is coated on top of this. After that, when the resist film is completely peeled off, the parts of the dial where the resist was coated will be peeled off together with the resist, and the metal coated the first time will come to the surface, and the parts where the resist was not coated will be coated with the second coat. The metal coated on the surface comes out. When the dial plate is anodized in this state, an electrolytically colored film can be obtained which is colored in two colors depending on the metal used.

The following will explain based on examples.

After a pattern such as a radial pattern or a hairline pattern is formed on the surface of the dial substrate 10 made of brass or nickel silver material, it is washed with alkali or acid and dried with hot air. This dial board 1 is placed in a vacuum evaporation tank, and the degree of vacuum is 1o-6 TOr? After cleaning the surface by degassing with ' and then ion bombarding at a vacuum level of 10-'' Torr, titanium was deposited on this clean surface. The thickness of the titanium deposited film 2 was 1000 to 2000.
It was X. [Step 09] Next, resist ink 3f was printed on a part of the dial surface and cured by irradiating ultraviolet rays. (Step b). Next, this dial plate was placed in a repressure vacuum evaporation tank to evaporate T/Tal 4.

(Step C) Next, the dial plate was dipped in a release agent, and the resist ink 3 applied in the step was peeled off. (Step d) This dial was anodized under the following conditions. (Step e) Electrolyte 0.3% oxalic acid solution temperature: 25°C Counter electrode 0. Platinum plate electrolysis voltage. 157 This dial was thoroughly washed with water and dried. The color tone of the anodized liquid film is pale blue for the anodized coating 5 on the titanium part;
The color tone of the anodized liquid film 6 on the mental part was yellow. If necessary, it is also possible to apply clear lacquer to the dial surface.
By changing the type of paint, various combinations of color tones can be obtained, and by changing the electrolysis voltage, different color tones can be obtained. Various designs can be obtained by changing the pattern of resist ink.

As described above, according to the present invention, 2
It is possible to obtain a dial plate with a beautiful color tone, and the design effect is remarkable.

[Brief explanation of drawings]

1@1 Figures α to e are cross-sectional views taken through each step of the dial plate of the present invention. 1. Dial board substrate 2°, metal coating film 31. Resist film 40. Metal coating film 50. Anodic oxide film 6°. Applicant for anodic oxide coating and above Patent attorney Tsutomu Mogami Daini Seikosha Co., Ltd.

Claims (1)

[Claims] Vapor deposition, ion brating, on the surface of the metal dial board,
Coating groups 4a or 5a of the periodic table such as titanium, niobium, mental, etc. by sputtering etc., then printing resist ink on a part of the dial surface and curing it,
Furthermore, a metal different from the above-mentioned coating metal among Group 4α or 5a of the periodic table is coated, resist ink is applied, and anodization treatment is performed while the dial surface is coated with two types of metals. A watch dial featuring two different colors depending on the difference.