JPS61279666A - Formation of metallic film for ornaments - Google Patents

Abstract

PURPOSE:To form a metallic film which is changed in the various densities of color tones onto the surface of ornaments at a low cost by subjecting the ornaments held to a mask jig which has an aperture and is changed in the spacing to ion plating. CONSTITUTION:The metallic film is formed on a timepiece band 3 held to the mask jig 2 attached by holders 4 to a rotary support 5 in a vacuum vessel 1 by ion-plating the evaporating particles generated from a vapor source 8 thereto. The jig 2 is formed by welding and joining a rear surface part 2a and a front surface part 2b and is provided with the aperture 2c at one end. The jig is decreased in the thickness toward the other end and masks the rear and side surfaces of the band 3 inserted through the aperture 2c therein and held thereby and the jig changes the spacing between the surface and the above- mentioned front surface part 2b. The color tones of the metallic film formed on the surface of the band 3 are thereby darkened from the other end toward the one end and the film shows the gentle change of the color tones.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a metal film on the surface of an accessory such as a watch band by an ion plating method.

[Conventional technology]

Thin film formation techniques using the ion plating method are less polluting than conventional wet plating, and have attracted attention in recent years as a method that can coat substances that cannot be coated with wet plating, and are highly anticipated. It is a technology that

On the other hand, for jewelry that has the character of an ornament such as a watch band, the boundary between the part with the metal coating and the part without it,
The desire to form a titanium compound coating that has a golden yellow color with a gradual change in color tone has been made for the reasons of diversifying designs and reducing processing costs by reducing the amount of coating material used.

Conventionally, as a method to meet the above requirements, a masking agent is applied to the back side and sides of the accessory, such as a watch band, and a masking agent is applied to the front side, and then applied to the other parts. Attempts have been made to mask the exposed portions of the watch band by printing minute dots on the boundaries between the missing molecules and the exposed portions of the watchband using a masking agent.

[Problem that the invention seeks to solve]

1 However, this conventional method requires a lot of man-hours to apply the masking agent to the surface of the jewelry, and
Construction When performing ion plating, various vapors from the masking agent are dissipated into the empty vacuum chamber at high temperatures and high vacuum, which adversely affects the degree of vacuum and the gas composition inside the vacuum chamber, causing the metal coating to deteriorate. However, the necessary adhesion and desirable color tone are particularly poor.

Furthermore, in a subsequent process, the masking agent must be removed, a processing device for this removal is required, and a certain amount of removal processing solution is required each time, resulting in a high cost.

Furthermore, the titanium compound film formed on the portion printed in the form of fine dots has the disadvantage that the finish remains rough when viewed as a decorative item.

The present invention solves the above-mentioned drawbacks, and eliminates the need for applying a masking agent to the surface of the accessory and removing it in the subsequent process. The purpose is to form a metal film by changing the

``Means for Solving the Problems'' In order to achieve the above object, the present invention provides a mask jig which is attached to a vacuum chamber by a rotating support and has one or more openings to hold the accessory. A metal coating is formed on the accessory by an ion plating method while changing the gap between the surface of the accessory and the mask jig.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view schematically showing an ion plating apparatus used in a method for forming a metal film on the surface of a watch band, which is an embodiment of the present invention.

1 is a vacuum chamber, 2 is a mask jig which is a cathode, 5 is a rotating support, 6 is a power source for an anode, 7 is an anode, 8 is an evaporation source, 9 is an ionization electrode, 10 is an ionization gas inlet, 11 is a It is an exhaust port.

To explain the configuration and operation in Figure 1, inside vacuum chamber 1 □
Rotating support with multiple mask jigs 2 attached to the
15 is provided, and each of the above-mentioned ~ Suffu jigs 2 is provided with
□A watch band (not shown) is inserted inside. Also, the rotation support 5 is shown in the figure:
□ Torque is transmitted from a drive system that does not operate at a constant speed.
□Rotate.

When the inside of the vacuum chamber 1 reaches a predetermined degree of vacuum and heating conditions, the anode 7 and the ionizing electrode 9 each act, the molten surface of the evaporation source 8 reacts, and the evaporated particles move toward the mask jig 2, which is the cathode. Ion plating is performed by flying toward the target.

2 and 3 show the structure of the mask jig of the ion plating apparatus shown in FIG. It shows.

A mask jig 2 made of a processed stainless steel plate for holding and masking the watch hand 3 is supported by a rotating support by an elastic holder 4 made of processed stainless steel wire. The mask jig 2 has a thickness that decreases from one end to the other and an inclined external shape, and an opening 2C is formed at one end. By inserting the band 3 from 2C, the band 6 can be held by the mask jig 2.

The mask jig 2 has a back surface portion 2a and a front surface portion 2b joined by welding, and this mask jig 1''.

A holder 4, which holds the rotary support 2 by inserting it from the outside, is attached to the rotary support 5 by welding.

Hold the watch band 3 on this mask jig 2 □
, the watch band 3 is directly attached to the back part 2a.
□Engrave and completely cover the back and sides of the watch band. -, 5 to 32. 7 pieces, aww, yo. , A gap is created between the front side of the i-meter band 3 and the surface part 2b, and this gap is formed by the opening 2c of the mask jig 2.
It gradually becomes smaller as it goes from one end to the other end of the mask jig 2, and by coming into close contact with the other 1° end of the mask jig 2, the end of the watch band O
part is completely masked. And in this state Io
By performing modeling, the mask
``Go to one end of jig 2 from the other end (busy
□The color tone of the front side of the watch band 3 becomes darker (the color tone becomes darker), and the shade of the color tone can be changed gradually.
Also, when ion plating is performed, a metal film is attached to the outside of the mask jig 2, but this metal film can be peeled off and recovered, and is peeled off and recovered after a number of uses.

In this embodiment, a watch band is used as an accessory, but the accessory is not limited to a watch band.

It goes without saying that the same procedure can be applied to other accessories as well. In addition, the shape of the mask jig and the position and shape of the opening provided in the mask jig change depending on the shape of the accessory and the design of the metal coating formed on the surface of the accessory. In addition to changing the shape of the mask jig, for example, openings may be provided at both ends to minimize the gap in the center, or the shape of the surface of the mask jig may be complexly changed to create complex changes in shading. It is possible to satisfy design requirements such as

〔Effect of the invention〕

By adopting the method of forming a metal film on the surface of an accessory than the ion plating method using the mask jig described above, the metal film formed on the surface of the accessory can have a change in shading, or the underlying metal It uses color to improve the aesthetic appearance of the surface of jewelry, and since it does not use masking agents, it does not require processes such as applying and peeling off masking agents, so it is low cost and does not affect the conditions of ion plating in any way. The metal coating is formed without any adverse effects, and the effect is great.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an ion plating apparatus used in an embodiment of the present invention, and FIGS. 2 and 3 show the structure of the mask jig of the ion plating apparatus of FIG.
Figure 2 is a perspective view, Figure 3 is a front view, and Figure 3 is a perspective view.
This shows the state seen from the direction in which the figure enters. 1... Vacuum chamber, 2... Mask jig, 2
a... Back part, 2b... Surface part, 2C...
...Opening, 3...Watch band, 4...
...Holder, 5...Rotation support, 6...
...Anode power supply, 7...Anode, 8...
・Evaporation source, 9...Ionization electrode, 10...
...Ionization gas inlet, Figure 1 Figure 2 Figure 3 ζ

Claims (1)

[Claims] A state in which an accessory is held and covered by a mask jig that is attached to a vacuum chamber by a rotating support and has one or more openings, and the gap between the surface of the accessory and the mask jig is changed. A method for forming a metal film on an accessory, the method comprising forming a metal film on the accessory using an ion plating method.