JPS58104177A - External parts for watch - Google Patents

Abstract

PURPOSE:To obtain golden parts with high reproducibility in a short treatment time by forming titanium nitride films on parts by ion plating and by further forming tantalum nitride films on the titanium nitride films by ion plating. CONSTITUTION:A vacuum vessel 1 is evacuated to prescribed vacuum degree with an exhaust system 2, and while rotating a jig 4 on its axis under a prescribed partial pressure of N2, ion platin is carried out with a high voltage electron gun evaporator 6 for evaporating Ti, a probe electrode 9 with applied positive potential, an acceleration power source 8 and a gas introducing system 3. The vessel 1 is evacuated again to a prescribed vacuum degree, and ion plating is similarly carried out with a high voltage electron gun evaporator 7 for evaporating Ta. Thus, golden uniform film different froms titanium nitride films are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the formation of a golden-colored coating on an exterior component for a portable watch. Gold or gold alloys have been peeled off or wet-plated as materials for GTS products for gold-colored portable watches. In recent years, 41 films of titanium nitride, tantalum nitride, etc. that exhibit a golden color have been formed by ion blasting, and in particular, titanium oxide coated M is commonly used for decorative exterior parts such as exterior parts for mobile watches. It has been put into practical use. However, from FK, the color aAil of the titanium nitride coating has a lower brightness than gold, gold alloy, and gold plating, and it has a dark feeling, and green or brown used to have a cheap feeling. On the other hand, the golden color of tantalum nitride gives a more noble feeling than that of titanium nitride. However, when forming a coated tube by ion blasting, the melting point, vapor pressure, and other physical properties of the evaporated substance greatly influence the rate of film formation and film quality.Especially when tantalum nitride is made, the evaporated substance is 32731 Because tantalum has a melting point of However, it has been difficult to put it into practical use due to poor reproducibility caused by the long processing time.

An object of the present invention is to provide an exterior part for a portable hour hand that takes advantage of the characteristics of a titanium nitride coating that has a golden color with a high rate of wrinkle formation, and has a tantalum nitride coating that has a noble golden color.

Next, the present invention will be explained with reference to the drawings.

Figure #'i is an ion blating device called the active reaction vapor deposition method for processing exterior parts for mobile watches. 5
numeral 4 is a stainless steel mobile watch case, and 4 is a rotation jig capable of rotating parts, which is designed so that a negative potential is fully applied by an accelerating power source 8.

First, vacuum chamber 1 and exhaust thread 2 are used to connect 5 x 10-” To
After exhausting to rr, high voltage electron gun evaporation WR for titanium evaporation
Probe voltage 1j? with tIt6 and positive potential applied? , 5X1υ-'T using acceleration power supply 8 and 7!7s introduction system 3
When ion plating was performed while rotating the rotating jig 4 under a nitrogen partial pressure of orr, a titanium monoxide coating with a golden color was obtained *1 - approximately 1 μm stainless steel mobile watch case 5
It was found that it is possible to form

Next, after forming about 1 μm of titanium nitride under the same conditions as above, the vacuum chamber 1 f I X 1'0-' Tor
Exhaust to r with an exhaust thread 2, emit tantalum, etc. using a high voltage electron gun evaporator 7, a probe electrode 9 to which a positive potential was applied, an accelerating current of 0IAa, and 3 waste introduction systems to 7X10'''
While rotating the rotating jig 4 under a nitrogen partial pressure of 4'Torr, the tantalum nitride coating, which has a golden color different from the golden titanium nitride coating prepared under the above conditions, was found to have a tantalum nitride coating of about It was formed with a thickness of 3 μm, and there was no problem in terms of appearance.

For comparison with a stainless steel mobile watch case made by this method, a tantalum nitride film of α5 μm in thickness was formed on a stainless steel mobile watch under the same conditions as the above method, and there were some areas where the color tone was clearly different. There was a problem with the decoration.

Furthermore, when both samples were subjected to a salt spray test at -35°C for 96 hours, only tantalum nitride was formed, and the next sample showed rust on the entire surface, whereas the sample with titanium nitride in the lower layer showed very little rust. It turned out that there was no change and there was a significant difference.

V-TsujiAs an example, a stainless steel mobile watch case was used as the base side, but other bases if4. As for the parts, □Kao7.・1・−41, I, −,! . Engineering, ah.

'I It is clear that the invention can be applied, and the contribution of the present invention to the diversification of decorations is significant.

[Brief explanation of the drawing]

The figure is a sectional view of an ion blating device for implementing the present invention. 1... Vacuum chamber 2... Exhaust system 3... Gas introduction system 4... Rotating jig 5... Stainless steel ill IF # Wt 'y
-Set 6... High voltage electron gun evaporator for titanium evaporation 7...
・High-voltage electron gun evaporator for tantalum evaporation 8...Acceleration power source 9...Probe 11tI#A From above: Daini Seikosha Co., Ltd. Agent Patent Attorney Mogami

Claims (1)

[Claims] Titanium nitride VAST has a golden color on the base for exterior parts for mobile watches.By ion blating, it is shaped like LD+: L
This is an exterior part for a mobile watch that is made of tantalum nitride coated with Mk ion brating to give it a golden color.