JPS6143244Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a display board for a watch, such as a dial, parting board, planting ring, end plate, etc. Conventional watch dials generally have a thickness of 400 μm and are made of copper or brass for reasons such as functional quality, appearance quality, and mass productivity. In addition, the 300μ thick dial is made of strong materials such as nickel silver and stainless steel, ensuring functional quality, appearance quality, and mass productivity. In addition, thin dials that require higher material strength are made of clad materials such as brass and beryllium copper.

If the Cu material feet are directly spot welded to the lower surface of the dial with the thickness and material of the conventional dial listed above, welding heat will cause foot bumps, or indentations, to occur on the dial surface. These indentations pose a major problem in terms of appearance quality, so as a countermeasure, the dial surface is polished to eliminate the indentations after welding. In addition, for dials with patterns added to their surfaces, legs made of Cu material with brazing material in the center are used, and the brazing material in the legs is melted in a tunnel furnace to secure the legs to the dial. In this case, because the dial is heated to a high temperature,
Dirt on the surface of the dial plate, decrease in hardness of the dial plate material, etc. occur, resulting in difficulties in yield and workability. In addition, thin dials are more likely to deform when passed through the oven.
Also, due to softening, deformation occurs due to impact.

This invention is applicable not only to plate thicknesses of 400μ and 300μ, but also to 200μ and 200μ.
It is designed to allow direct spot welding of Cu material feet to a dial with a thickness of μ.A heat insulating plate is placed on the top of the metal board, a top plate is placed on top of the heat insulating board, and the feet are welded to the bottom of the metal display board. This is a display board for a foot clock. In this invention, even if the legs of the Cu material are directly spot welded to the metal substrate, the heat that would cause an indentation is not transmitted to the top plate due to the effect of the heat insulating plate, and in addition, the pressure applied to the legs of the Cu material is Also, the heat insulating plate acts as a cushion and does not cause impressions on the top plate. It should be noted that the functional quality of the feet, especially the strength, is the same as that of a normal dial, and there are no functional problems.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a dial according to the present invention, in which a heat insulating plate 2 made of epoxy resin and glass fiber is arranged between a metal substrate 1 made of brass and a metal top plate 3. The metal substrate 1, the heat insulating board 2, and the display board 3 are bonded together by thermocompression using the epoxy resin and adhesive of the heat insulating board 2. After that, a pattern 4 is painted on the surface of the top plate 3, and then the outer shape and small holes are punched. Next, the feet 5 made of Cu material are attached by direct spot welding under the conditions that would normally be used to weld them to the dial. Next, a surface treatment finish such as plating or painting is applied to the dial surface to complete the dial. The dial made in this way has the same appearance as a conventional dial, and even if the thickness of the dial is 200 μm, direct spot welding is possible, and there are no impressions on the dial. Conventionally, dials with a thickness of 300μ and 200μ have been made using metal cladding materials consisting of two or three layers, but because of the high hardness of the material, it was difficult to apply patterns using press molds, etc., and the types of patterns were limited. However, if this structure is adopted, various patterns can be applied.

Next, FIGS. 2 and 3 are plan views of a dial plate according to a second embodiment of the present invention, in which a pattern is formed by etching the metal front plate 3 and removing a portion thereof. Further, FIG. 3 is a sectional view taken along line A-A' in FIG. Heat insulation board 2
For this, we used pre-colored epoxy resin to cut out the outline and weld the legs. Metal substrate 1
As in the first embodiment, the heat insulating plate 2 and the top plate 3 are fixed by thermocompression using epoxy resin and adhesive. Next, masking is performed using photoresist, and a pattern is formed by etching.
Next, surface finishing such as plating is applied to complete the dial. The dial made as described above has a step between the metal front plate 3 and the heat insulating plate 2, so a pattern with a three-dimensional effect is obtained, and the color and pattern of the metal plating and resin are completely different. With balance, you can create new expressions. Furthermore, when plating is performed, by establishing electrical conductivity from the metal top plate 3, only the metal top plate 3 is plated, and the metal substrate 1 is not plated, which reduces the plating cost and reduces the cost of the dial. It also leads to

In addition to the dial, this invention also includes parting boards, facing boards,
It can also be applied to planting rings, etc. As for the material of the metal substrate and metal top plate, brass, stainless steel, beryllium copper, etc. are selected depending on the strength of the dial and other requirements.
In addition, for the heat insulating board, we use epoxy and glass fiber, epoxy and glass cloth, epoxy and asbestos, reinforced plastic and glass fiber, and phenol, depending on the needs such as dial strength, workability in post-processing, and adhesion to the metal plate. You can choose fiberglass. Furthermore, for the top plate, in addition to metal, plastics, ceramics, etc. are used. Also, when considering a dial with a thickness of 200μ, the minimum thicknesses of the metal substrate, metal top plate, and heat insulating plate must be 80μ, 10μ, and 80μ or more.

As described above, the present invention enables foot direct spot welding on a watch display board, and provides a watch display board that is inexpensive and of excellent quality.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the dial of the first embodiment of the present invention, Fig. 2 is a plan view of the dial of the second embodiment of the invention, and Fig. 3 is a sectional view taken along line A-A' in Fig. 2. It is. 1...Metal board, 2...Insulating board, 3...Top plate,
4...pattern, 5...legs.

Claims (1)

[Scope of utility model registration request] A display board for a clock with a foot, characterized in that a heat insulating plate is provided on the upper surface of a metal substrate, a top plate is provided on the upper surface of the heat insulating plate, and legs are welded to the lower surface of the metal substrate.