JPS6235282A - Dial for timepiece - Google Patents

Abstract

PURPOSE:To make a tight joint and to obtain a thin dial which is superior in design by joining and fixing a surface plate, a base plate, characters, and dial legs to a metallic layer of double structure formed on a faying surface by soldering. CONSTITUTION:The faying surface of the jewel surface plate 1 for the CAN base plate 2 and holes of the plate 1 where characters are fixed are treated by vapor-phase plating 6, wet plating 7 is carried out on the top surface of the plating 6, and the faying surface of the base plate 2 for the surface plate 1 and holes of the base plate 2 where dial legs are fixed are placed 6 and 7. Liquid solder 6 is printed on the top surface of the plating 7 on the base plate 2 and the surface of the surface plate 1 where the plating 7 is provided is pressed; and excessive solder is made to flow out into a character holes and dial leg holes and legs of the characters 3 and legs of the dial are inserted into the holes and heated. Consequently, the joning is mde tight to obtain the thin dial which has the metallic characters and is superior in densith without any functional problem.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a watch dial made of precious stones, ceramics, sapphire, or carbide materials.

[Conventional technology]

As a conventional technique, there is a technique shown in a partial cross-sectional view of a dial in FIG. For dial plates made of precious stones, dial feet 11 are welded to a nickel silver substrate 9, and the nickel silver substrate 9 with dial feet 10 is fixed to a precious stone face plate 8 via an adhesive 10. . Furthermore, the formation of the hour characters 12 on the precious stone face plate 8 has been limited to methods such as printing or vapor deposition. The same was true for dials made of hard materials other than precious stones, such as ceramics, sapphire, and carbide.

[Problem that the invention seeks to solve]

With conventional dials like this, it is not possible to directly weld the dial foot to the precious stone surface of a dial made of precious stones, and a nickel silver substrate is required, resulting in an increase in the total thickness of the dial. Furthermore, in order to satisfy functionality such as impact strength, the thickness of the dial must be 600μ or more, and it is difficult to put a thin dial of less than 300μ into practical use. Regarding the formation of hour characters, attempts have been made to fix metal typesetting directly to the dial surface using adhesives, but the fixing force was insufficient and designs were limited to methods such as printing or vapor deposition. It was not possible to expand the variation.

■ The purpose is to provide a watch character plate with metal typesetting that is also excellent in terms of design.

[Means for solving problems]

The present invention has a front plate made of a thin plate of hard material such as precious stone, ceramics, sapphire, or carbide, which has holes for fixing the typesetting, and a hard material such as Stellite or CAN that has holes for fixing the dial feet. A metal layer having a two-layer structure is formed by vapor phase plating and wet plating on the joint surfaces of the front board and the board, the front board and typesetting, and the board and the dial foot. The top plate, circuit board, typesetting, and dial foot are each bonded and fixed via solder.

〔Example〕

The present invention will be described in detail below based on the drawings.

FIG. 1 is a partial sectional view of a precious stone dial plate according to an embodiment of the present invention, in which 1 is a precious stone dial plate, 2 is a CAN board, 3 is typesetting,
4 indicates the dial foot, and 5 indicates the solder. 2 is an enlarged sectional view of the typesetting section of FIG. 1, and FIG. 3 is an enlarged sectional view of the dial foot section of FIG. 1. The method of joining the precious stone face plate 1 and the CAN board 2, the precious stone face board 1 and the typesetting 6, and the CAN board 2 and the dial foot 4 is as follows.

(1) Sputtering ((' r,
The thickness is 0.2 to 1 depending on All, etc.
Gas-phase meso-kilometres of μ are processed, followed by electroless (N i,
All, etc) plating or electrolytic (Ni, Au,
etc) By plating, a wet plating 7 having a thickness of 0.5 to 10 μm is formed on the upper surface of the vapor phase metal plate.

(Similar to the precious stone face plate 1, a gas phase Wet plating 7 is formed on the metal layer and its upper surface.

(3) Liquid solder is printed with a thickness of 10 to 20 μm on the upper surface of the wet plating 7 processed on the CAN board 2 by screen printing.

(4) C
The liquid solder of the AN board 2 is positioned and pressed against the printed surface. When pressed, excess liquid solder flows out into the typesetting hole and the foot of the dial.

(5) Place the typesetting part of the typesetting part made of metal which has been plated etc. into the typesetting hole, and insert the typesetting part of the typesetting part made of metal into the dial hole 4.
Insert each.

(6) By heating at 250 to 300°C for 5 to 15 minutes, precious stone face plate 1 and CAN board 2, precious stone face plate 1 and typesetting 6
, the CAN board 2 and dial foot 4 are firmly joined via solder 5.

The total thickness of the precious stone dial plate completed according to the above example is 300 mm.
μ, which is 300μ thinner than the dial of the conventional technology.Furthermore, when it was assembled into a module and an impact test was conducted, the precious stone face plate 1 was cracked, the typesetting part came off, and the dial foot 4 came off. No problems occurred, and the product was functionally sufficient for practical use.It was also possible to produce a dial using books.In addition, in this example, typesetting and dial Although metal is used for the legs, it goes without saying that hard metals such as precious stones and stellite can also be used.Also, for the joint surface between the precious stone face plate and the CAN board, the typesetting holes on the precious stone face plate, and the dial feet of the CAN board. The reason for forming two layers of vapor phase plating and wet plating is to increase the solder bonding strength and improve the appearance quality.

〔Effect of the invention〕

As explained above, according to the present invention, a thin plate surface plate made of a hard material such as precious stone, ceramics, sapphire, or carbide, and a thin plate substrate made of a hard material such as Stellite or CAN are bonded to each other through solder. It is now possible to firmly bond the board, typesetting, and dial foot together, making it possible to create a thin dial with a thickness of 300 μm or less that has metal typesetting and is excellent in design. It has become possible.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of a precious stone dial according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the typesetting section of Fig. 1, and Fig. 3 is an enlarged sectional view of the letter plate foot of Fig. 1. FIG. 4 shows a conventional example, and is a partial sectional view of a dial plate. 1.8...Precious stone face plate, 2...CAN board, 6...Typesetting, 4.11...Dial plate foot, 5... ... Solder, 6 ... Vapor phase plating, 7 ... Wet plating, 9 ... Nickel silver board, 10 ... Adhesive, 12 ... ... Tokiji. Figure 1 No. 21!1

Claims (1)

[Claims] A top plate made of a thin plate of hard material such as precious stones, ceramics, sapphire, or carbide with holes for fixing typesetting, and a thin plate of hard material such as Stellite or CAN with holes for fixing the dial feet. A two-layer metal layer is formed by vapor phase plating and wet plating on the joint surfaces of the top board and the board, the top board and typesetting, and the board and dial foot, and solder is applied. A watch face plate characterized in that a front plate, a substrate, typesetting, and a face plate foot are each bonded and fixed through the intermediary.