JP2520401B2 - Manufacturing method of decorative parts - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a two-tone decorative component including a combination of a gold layer surface and a black layer surface.

[Prior art and problems] Various colored films using dry and wet plating methods are coated on decorative parts such as watches and glasses, and they are commercialized. There is a demand for a decorative part having no two-tone structure, and in particular, a two-tone structure using a combination of a gold layer and a black layer is regarded as the mainstream for expanding the variety of products. Heretofore, as a conventional method for obtaining a two-tone structure of a gold layer and a black layer, (1) the gold layer component and the black layer component are individually processed and then assembled.

(2) After forming the surface of the gold layer (black layer) on the entire surface of the decorative component, a mask material is formed in a pattern using a mask method, and then a black layer (gold layer) film is coated thereon, and then the mask material. A two-tone structure is obtained by peeling and removing.

However, they all have the following drawbacks. In other words, since the method (1) requires individual processing, there is a limit to the miniaturization of parts, so only a rough two-tone process can be achieved, and in order to commercialize many types, each part must be created individually. Moreover, it is not a very mass-production method in the recent production of small lots of various products, because it takes time to assemble. Further, in the method (2), the heat resistance, peelability, and
Due to problems in pattern transferability and the like, the boundary between the gold layer surface and the black layer surface is not clean, and a series of operations are troublesome, so it cannot be said to be a very mass-production method.

[Object of the Invention]

It is an object of the present invention to provide a simple and mass-producible method for producing a two-tone decorative component having a gold layer surface and a black layer surface.

[Structure of Invention]

Therefore, the present invention is a two-tone decorative component obtained by combining a gold layer having gold and a black layer surface made of a hard carbon film, and after forming the gold layer surface in a pattern, an intermediate layer made of silicon or germanium. , The hard carbon film is sequentially laminated, and at that time, by utilizing the fact that the adhesion between the gold layer surface and the intermediate layer is very weak, the intermediate layer and the hard carbon film on the gold layer surface are removed. As a result, the surface of the black layer is formed in a negative pattern on the surface of the gold layer to form a two-tone decorative component. Here, since the hard carbon film used as the surface of the black layer itself has a large film stress, it is impossible to directly form a film thickness of 0.5 μm or more on the component. Adhesion is assured by forming silicon or germanium, which has excellent adhesion with the base component, as the intermediate layer. The silicon or germanium used here can be formed by the PVD method, the CVD method or the like, but it has been found that the adhesion to the layer containing gold is not good. For this reason, when a hard carbon film is formed on the surface of a gold layer having gold through an intermediate layer made of silicon or germanium, the hard carbon film stress distorts the intermediate layer, which cleans the film from the gold layer surface and the intermediate layer surface. The phenomenon of peeling was observed. The present invention is an application of the above-mentioned peeling mechanism to patterning the surface of a black layer. As a result, black is formed of a hard carbon film except for the gold layer surface having a pattern shape without performing a special operation. The layer surface can be patterned.

[Embodiment 1] An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a partial cross-sectional view schematically showing a two-tone structure comprising a gold layer surface and a black layer surface according to the present invention, and FIGS. 2 (a) to (d) obtain the structure shown in FIG. The process drawing for is shown. First, as a gold layer surface on a stainless steel base (1), a second layer is formed by electrolytic plating.
A gold layer (2) having a thickness of 0.3 μm was formed as shown in FIG. Then, the resist material used in the usual photolithography process was used to perform a patterning treatment on the surface of the gold layer (2) as shown in FIG. 2 (b) using aqua regia as an etchant. The patterning process on the surface of the gold layer (2) can be performed by a dry etching method, a lift-off method or the like. Next, after washing and drying the above-mentioned base (1), FIG. 2 (c)
As shown in, the silicon film as the intermediate layer (3) is formed on the entire surface of the base (1) by the sputtering method to a film thickness of 0.1 μm.
Formed.

It has been confirmed that the PVD method or the plasma CVD method can be used as the silicon film forming method. Further, as shown in FIG. 2 (d), a hard carbon film as the surface of the black layer (4) is formed on the upper layer by plasma CVD.
By the method, a film thickness of 1 μm was formed under the following forming conditions.

Hard carbon film formation conditions Source gas: CH ₄ , Excitation method: High frequency (13.56MHz), High frequency power: 500W, Gas pressure: 0.1torr, Deposition rate: 0.2, μm / min, Processing time: 5 minutes, Processing temperature: 150 ℃, film hardness: Vickers hardness, 5.000kg
/ mm ² , the hard carbon film obtained under the above conditions has an amorphous structure from the X-ray diffraction and RHEED analysis results, and from the FT-IR spectrum results, a small amount of hydrogen was contained in the film. I found out that Since the silicon film and the hard carbon film on the surface of the gold layer (2) of the base (1) which has been subjected to the above operation can be easily removed, the first film can be removed by blowing, brushing or the like. A two-tone decorative component having the structure shown in the figure is obtained.

The same effect as above was confirmed when germanium was used as the intermediate layer.

[Example 2] As the surface of the gold layer (2), a laminated structure of a chromium layer and a gold layer by a sputtering method was used. The thicknesses of the chromium layer and the gold layer were 0.05 μm and 0.3 μm, respectively. Although the patterning process may be performed on both the chromium layer and the gold layer as in Example 1, it was found that the target two-tone structure can be obtained by patterning the gold layer only. This is thought to be because the chromium layer as the underlayer of the gold layer has good adhesion to the silicon film, and this is due to the fact that by inserting the chromium layer on the substrate that does not adhere well to the gold layer, It shows that a two-tone configuration can be obtained.

Example 3 As the surface of the gold layer (2), a laminated structure of a titanium nitride layer and a gold layer by an ion plating method was used.
The titanium nitride layer and the gold layer each have a thickness of 0.3 μm,
The thickness was set to 0.1 μm, and patterning processing was performed by the lift-off method. At this time, the gold layer contains 1 to 2 wt% of nickel for improving the color tone, but the degree of adhesion with the silicon film is almost the same as that of gold alone, and it is easily peeled off by laminating the hard carbon film, The desired two-tone configuration was obtained.
In the above embodiment, the two-tone structure on the flat base has been described, but it is of course possible to apply it to the base having a three-dimensional shape. At this time, since the hard carbon film is formed by the plasma CVD method, the plasma CVD method is preferable also in the method of forming the intermediate layer of silicon, germanium or the like in consideration of the covering property. In addition, although a metal base is used as the base (1) in the above-mentioned embodiment, other materials such as plastic are also applicable. However, since the maximum temperature during the formation of the hard carbon film is about 150 ° C, it is necessary that the heat resistance of the base (1) is 150 ° C or higher.

〔The invention's effect〕

As is clear from the above description, by utilizing the poor adhesion between the gold-containing gold layer surface and the silicon film or the germanium film as the intermediate layer of the hard carbon film, the patterned gold layer surface can be formed. By only sequentially laminating the intermediate layer and the hard carbon film on the entire surface of the base including, as a result, it is possible to form a pattern on the black layer surface consisting of the hard carbon film except for the gold layer surface having the pattern shape. By applying to decorative parts such as cases, bands, and eyeglass frames, two-tone decorative parts having a three-dimensional gold layer surface and a black layer surface can be manufactured by a simple and mass-producing method, and the effect is great. .

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view schematically showing a two-tone structure consisting of a gold layer and a black layer showing an embodiment according to the present invention, and FIGS. 2 (a) to (d) are two-tone structures of FIG. The process drawing for obtaining is shown. 1 ... Base, 2 ... Gold layer, 3 ... Intermediate layer, 4 ... Black layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C23C 28/00 C23C 28/00 B

Claims (1)

(57) [Claims] 1. A gold layer having gold on at least the surface thereof is partially coated on the surface of the base, and then silicon or germanium is used as an intermediate layer on the entire surface of the base consisting of the gold layer and the exposed portion of the base. By coating and then coating the hard carbon film by plasma polymerization treatment in an atmosphere containing a hydrocarbon gas, and selectively removing only the hard carbon film on the surface of the gold layer, it is possible to obtain two-tone gold and black. A method for manufacturing a featured decorative component.