JPS63128166A - External parts for timepiece - Google Patents

Abstract

PURPOSE:To provide parts having superior corrosion and wear resistances, adhesion and high ornamental value by carrying out two-color finishing with a golden gold alloy film and a hard titanium oxide film having a blue color tone. CONSTITUTION:A stainless steel (SUS 304) watchcase 1 is coated with >=23-k. Au-Ni-In alloy film 2 by electroplating. The coated case 1 is set in a vacuum chamber and subjected to ionic bombardments by impressing a prescribed voltage in gaseous Ar to clean the surface of the case 1. The vacuum chamber is then returned to a prescribed pressure by exhausting the gaseous Ar, oxygen is introduced to a prescribed pressure and plasma is generated by impressing a prescribed voltage to coat the case 1 with a blue titanium oxide film 3 by ion plating. The part of the case 1 on which the blue film 3 is left is masked with an org. resist 4, the resist 4 is baked and the film 3 is removed except the masked part with a removing soln. contg. a strong acid. The resist 4 is finally removed with an org. solvent and a two-color finished case is obtd.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is characterized by a gold or gold alloy layer on the surface of the metal alloy and a titanium oxide coating that exhibits the color of fruits and vegetables produced by the ion-blating method. Concerning exterior parts for watches with nine finishes in two colors.

[Summary of the invention]

The present invention provides an exterior part for a watch, in which the metal box is made of an alloy material, coated with a gold or gold alloy layer, and coated with a titanium oxide film that has a fruit or vegetable color tone by an ion-blating method. Furthermore, by partially peeling off the upper layer t'fls, it has corrosion resistance and adhesion with a two-tone color of gold and blue in part or the whole.

We provide exterior parts for watches with excellent wear resistance and high decorative value.

[Conventional technology]

The conventional combination f1, which forms two colors of gold and fruit and fruit colors, and consists of gold plating and spine color painting on a 6ft part outside the clock circumference, is a combination using the alumite method.9 [Problems to be solved by the invention However, with the conventional method, it is necessary to perform the evening color painting using a masking jig, etc. For watch cases with complicated three-dimensional shapes, the cost of the masking jig is expensive, and it is rarely used in applications. It was impossible. However, there was a problem in that corrosion resistance deteriorated if the alumite was scratched. In addition, the appearance obtained by these methods does not have a metallic appearance and is limited to some low-grade products. Gold color due to gold alloy layer and surface #! Degree is 1 (v10L
By finishing in two colors using a titanium-based hard coating layer with IOi that has excellent abrasion resistance, scratch resistance, and corrosion resistance and exhibits the color tone of evening yellow thread, it has corrosion resistance, abrasion resistance, and layered decoration. We provide all the high value exterior parts for watches.

[Elaborate means to solve the problem]

In order to solve the above problem TS4, the watch exterior parts of the present invention include: (1) gold or gold alloy 1- on the surface of the metal or alloy;
A titanium oxide film with a bluish tone created by the ion plating method? The upper layer is partially peeled off and a two-color layer is formed partially or entirely.
r: %.

(2) All characteristics are that the titanium oxide film is a compound of one or both of TiO and Tie.

(3) Money! The alloys for j4 are stainless steel, gold, and copper alloys.

Nickel 19 is coated with nickel alloy and 7'j UjJ alloy.

It is characterized by being made of aluminum alloy, zinc alloy, and steel.

[Effect]

According to the above-mentioned groove bottom of the present invention, the metal 19 has a gold color or a gold color of an alloy-saving layer and an evening color of a titanium oxide coating on the surface of a watch exterior part made of a metal-containing material. By forming the two-color finish used, the gold or gold alloy layer, which is a highly corrosion-resistant metal, ensures the corrosion resistance required for exterior parts for watches.

The titanium oxide film laminated as the upper layer is formed by the ion-blating method, but since most films obtained by the ion-blating method generally have relatively pinholes, the titanium oxide film is Before coating, it is necessary to fully plate gold or gold alloy, which is a highly corrosive metal, to ensure corrosion resistance. If the metal or alloy used as the material is a corrosion-resistant material such as copper alloy, zinc, zinc alloy, aluminum alloy, or iron alloy, copper plating, nickel plating, chrome plating, etc. may be used as the base layer of the gold or gold alloy layer. It is common to ensure a certain degree of corrosion resistance by laminating several kinds of materials.

Next, a vegetable-colored titanium oxide coating is applied to gold or gold alloys by ion plating. Cover.

The coating has a hardness of Hv1000 or more, has excellent abrasion resistance and scratch resistance, and has extremely good adhesion to gold or gold alloy as a rounding base layer produced by the ion blating method. There is little difference in the coefficient of thermal expansion with the solid metal or gold alloy layer, and there is no peeling phenomenon due to the temperature of the material after the ion-f1 noting treatment. Furthermore, the fruit and vegetable color of the titanium oxide film has sufficient decorative value as an exterior part for a watch. By masking, peeling off the film other than the masked portion, masking the film, and peeling off the organic resist, an exterior part for a watch having a two-color tone partially or entirely is finished. Said Ii! This process completely improves the corrosion resistance of the metal or alloy as a material, and creates a gold or gold alloy layer with the best appearance and quality, and a fruit-colored coating with excellent ffi adhesion, abrasion resistance, and scratch resistance by the ion-blating method. The present invention can be applied to exterior parts for watches that exhibit two colors in part or in their entirety. The thickness of the metal or gold alloy is economically or functionally optimal from 3 μm to 5 μm, but in the case of recesses, the film thickness can be reduced to about 1 μm, where wear resistance is not required. ′!
In the case of a convex portion, wear resistance is required, so depending on the shape, it may be necessary to add a thickness of up to 10 μm.

As for the composition of the gold alloy, it can be applied to all alloys as long as it has a gold-colored appearance. Next, a compound of titanium and oxygen element produced using titanium or a titanium alloy as an evaporation source and oxygen gas as a reactive gas can be applied to the evening-colored titanium oxide film produced by the ion blating method Cτ. The optimal thickness is in the range of 1 μm to 2 μm in terms of productivity and functionality, but even if it is expanded to the range of 0.2 μm to 5 μm, it is hard with Hv100'0 or more, so it has good wear resistance and scratch resistance.

The adhesion effect remains unchanged. In addition to the method described above, two-color finishing methods include forming a gold or gold alloy layer, masking the areas where you want to retain the gold or gold alloy color with an inorganic resist, and then applying a light color coating to the entire surface using the ion blating method. After coating, two-color finishing is easily possible by peeling off the inorganic yarn resist. Generally, the two methods are selected for the purpose of reducing the resist area and improving productivity.

The present invention will be described below based on examples.

[Example 1] A watch case made of stainless steel material (SUS304) was coated with Au-Ni-I by electroplating.
Temporarily covered with a 6μm n alloy film. The stainless steel watch case is heated with argon gas prior to the notification.
The surface of the watch case was cleaned by ion bombardment at 110 Pa and a voltage α5 Kv applied to the substrate. Next, exhaust the argon gas and set the vacuum guide to 3X10”P.
After returning to a, add oxygen t2×10 as a reactive gas again.
Introduced with a substrate voltage f 0.3 K v, plasma was generated, and the metal titanium board heating method was used to heat and evaporate the material, resulting in a 1 μm thick layer of fruit-colored titanium oxide, a compound of titanium and oxygen. Coating: Figure 1(a) shows MJli51.' of the watch case coating formed by the above method.
shows. Next, as shown in FIG. 1(b), masking is performed using an organic resist 4 on the intersecting portions, leaving the evening color coating layer 3, and after baking the masking, as shown in FIG. 1(3), the areas other than the masked portions are The fruit and vegetable colored coating layer 3 of the above was peeled off using a strong acidic stripping solution, and then the organic resist 4 was peeled off using an organic solvent after partial masking as shown in the first factor (d) to produce a two-color finish watch case. . The 9 stainless steel watch case manufactured using this method has a hardness of 1200 Hv for the color coating layer, and the artificial sweat corrosion resistance test (40℃ x 90% humidity x 48f (r)
), artificial seawater (40C x 90% humidity x8ar), bending test (180° bending), heat shock test (30°
0°C × 10 minutes of force heating → water shell quenching, repeated 5 times), abrasion resistance test (500? load was applied to the watch case on cowhide,
At 5crR stroke, the two-color boundary k of the case η↑
All of the test results above are satisfactory for corrosion resistance, adhesion, abrasion resistance, and scratch resistance as a watch case. 90 [Example 2] Using a watch case made of brass material, nickel plating with a thickness of 5 μm was applied as a base layer, and on top of that, Au-Ni-N alloy plating'(!''5 μm) was applied. Diagram (a)
Shown below. Next, as shown in Figure 2(b), Au-N1-In
f Gold plating ff 1k The remaining visible portion is masked with 1 inorganic resist and fired. After that, as shown in FIG. 2(c), metal T1? An ion plating color coating layer 3 of 3 μm was coated using oxygen as an evaporation source and a reactive gas. As shown in FIG. 2(d), the inorganic resist was peeled off with an organic solvent to produce a two-color gold watch case with gold and evening colors.

In this case, the surface hardness of the evening color conversion Jli of the watch case was Hv1500, and as a result of the same quality test as [Example 1], the puncture resistance as a watch case was found to be ¥! [Effects of the Invention] As described above, according to the present invention, gold or gold, which is chemically stable and has high decorative value, is coated on the surface of the exterior parts for watches. gold alloy l
- Excellent corrosion resistance, abrasion resistance, and scratch resistance with a gold color and surface hardness of Hv1000 or more.The fruit and vegetable color of the titanium oxide temporary film layer and the two-color finishing ratio of the titanium oxide temporary film layer provide unprecedented corrosion resistance.

It has become possible to provide an exterior part for a watch that has excellent durability, abrasion resistance, and scratch resistance, and has extremely high decorative value due to the combination of gold and fruit and vegetable colors. It can be applied not only to exterior watch parts such as watch dials, hands, and bands, but also to all decorative parts such as eyeglass frames, lighters, tie clips, and accessories.

[Brief explanation of the drawing]

FIGS. 1 and 2a are cross-sectional views showing each process #It of an embodiment of the exterior part for a timepiece according to the present invention. 1...Stainless steel (EI08304) material 2...A
U-Ni-N plating layer 6...Titanium oxide fruit/fruit color coating 4...Organic resist 5...Brass material 6...Nickel plating layer 7...Inorganic l/cyst or more Applicant: Seiko Epson Corporation Company...) - Agent Patent Attorney Mogami 1.1 and 1 other matters. Figure 1 Figure 2

Claims (3)

[Claims] (1) Forming a gold or gold alloy layer on the surface of a watch exterior part made of metal or alloy and a titanium oxide film exhibiting a bluish color by ion plating,
An exterior part for a watch, characterized in that the upper layer is partially peeled off to form a two-color layer partially or entirely. (2) The exterior part for a timepiece according to claim 1, wherein the titanium oxide film is mainly composed of one or two compounds selected from TiO and TiO_2. (3) The exterior part for a timepiece according to claim 1, wherein the metal or alloy is stainless steel, gold, copper alloy, aluminum alloy, zinc alloy, or iron alloy.