JPH0275991A - Manufacture of dial - Google Patents

Abstract

PURPOSE:To eliminate each process of polishing and multiple painting by forming a colored resin layer on a fixed-shape material for base plate and a transparent photosetting resin layer having a smooth surface on the colored resin layer by mirror transfer while the photosetting resin is hardened by ultraviolet rays irradiation. CONSTITUTION:A colored resin paint 3 is applied to the surface of a fixed-shape base plate 1 for the dial and a transparent photosetting resin 6 is dropped onto the layer of the pant 3. Then a transferring mold 4 which can transmit ultraviolet rays is brought into contact with the resin 6 with the transferring surface having a smooth mirror face on the bottom side as shown in Figure (a). Then the resin 6 is irradiated with ultraviolet rays and hardened by the ultraviolet rays while the molding thickness controlling stoppers 5 which also work as weirs for preventing leaking out of excessive resin of the mold 4 are pressed against the surface of the base plate 1. Then the laminated plated shown in Figure (b) is obtained after the mold 4 is removed and is press-punched to the outside form of the dial. Thus the dial is obtained as shown in Figure (c). The dial is finished after printing and other works are performed on the dial. Therefore, a transparent resin layer having a smooth mirror face on the surface and a controlled thickness can be obtained after one time of forming work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in manufacturing methods, mainly surface processing of watch dials.

[Summary of the invention] A colored resin layer is formed as a first layer on a regular substrate for a dial, which has undergone base surface treatment, a transparent photocurable resin layer with a smooth surface is formed as a second layer, and a mirror transfer surface is formed as a second layer. A transparent transfer mold is used to apply ultraviolet rays to harden the dial while transferring it to a mirror surface.Then, the outer diameter edge is press-cut into the shape of the dial, and the smooth mirror surface that is formed is used as it is as the finishing surface of the dial. A method for manufacturing dials.

[Conventional technology] Conventionally, the surface treatment of dials involves plating,
A wide variety of designs are created by applying colored paint, transparent paint, or a combination of these. At this time, regarding the coating technology, consideration is being given to leveling agents, coating, drying conditions, etc. in relation to the surface finish appearance, but as stated in Publication of Utility Model Publication No. 61-20546, the final coating There is no better coated surface than a polished surface. Therefore, the above-mentioned Utility Model Publication No. 61-20546. Jitsukai Showa 61-1
52988, a method of polishing the final painted surface to obtain a beautiful dial surface is already widely used. However, this method requires polishing the soft organic coating surface, and polishing the soft surface is technically extremely difficult, requiring a large amount of processing time and resulting in a low processing yield. This is the actual situation. Polishing is usually 2,000 to 30
It requires two steps: lapping with a No. 00 grindstone to remove macroscopic irregularities on the surface, and then boring with a fine abrasive of 200 to 500 mm.As a result, the coating thickness, sagging, etc. management is required.

In addition, in order to increase the depth and taste of the surface appearance, these finishes are often applied with various colored coatings on the first layer, a transparent coating on the second layer, and then polished to form the final coated surface. In order to provide the second layer with a polishing allowance and to prevent sagging, it is unavoidable that it must be painted multiple times.

[Problems to be solved by the inventionffl] The problems to be solved by the present invention are, as described in the prior art, the drawbacks of the conventional method, namely, the technical problem of polishing the soft coating surface. It is therefore an object of the present invention to eliminate this polishing process, which is difficult and requires a large amount of processing time. Secondly,
The problem is the inefficiency of multiple coatings associated with the formation of the second layer of the coating film, and the object of the present invention is to eliminate this process of multiple coatings of the second layer.

[Means for Solving the Problems] The dial manufacturing method of the present invention includes forming a colored resin layer as a first layer on a shaped material for a dial substrate, and forming a transparent resin layer with a smooth surface as a second layer. The curable resin layer is formed by irradiating ultraviolet rays with a transparent transfer mold having a mirror transfer surface to cure it while mirror transfer, and is then press-cut into the shape of a dial.

[Example] Examples of the present invention will be described in detail below.

In Fig. 1 (α), a fixed bottle 2 for fixing to the watch body is attached to the regular board 1 for the dial plate, and a colored resin paint 3 is applied to the surface as a first layer. Or, a base plated layer has not been formed. If you want to make the most of the color tone of the colored resin layer, the former is used, and if you want to make the most of the plating color, the latter is used as the base treatment. A required amount of transparent photocurable resin 6 is dropped onto this first layer, and an ultraviolet-transparent transfer mold 4 is brought into contact thereon with the smooth mirrored transfer surface facing down, which also serves as a molding thickness control stopper. While the surplus resin leakage prevention dam 5 is pressed to the position where it contacts the surface of the dial substrate material, ultraviolet rays are irradiated to photocure the photocurable resin 6. When the transfer mold 4 is removed, a laminate as shown in (b) is obtained. This laminated plate is pressed into the shape of the outer diameter of the dial to obtain the dial as shown in (C). It is then completed by printing and other necessary processing as a dial. FIG. 2 shows an example in which the process is similar to that of the previous embodiment, but the mirror transfer surface of the transfer mold is built into a curved surface. The obtained laminate is shown in (h), but the cured transfer surface forms a curved surface, and (C) is the laminate that was press punched into the outer diameter shape of the dial. It can be seen that, as in this example, a precise curved surface shape that cannot be obtained simply by polishing can be obtained.

As described above, if a smooth mirror transfer surface is formed on the ultraviolet-transparent transfer mold, and the photocurable resin is laminated on the dial substrate using this surface, and the smooth mirror surface is transferred and formed, the surface will have a smooth mirror surface. Moreover, a transparent resin layer with a controlled thickness can be obtained by a single molding operation.

[Effects of the Invention] As described in ``Means for Solving Problems'', the following effects can be obtained according to the present invention.

First, the difficulty of polishing soft organic coatings is avoided.

Secondly, the process of applying the transparent paint multiple times to form the transparent resin layer as the second layer can be avoided, and these processes can be replaced by a single process of forming the photosensitive resin layer. According to the present invention, after the photosensitive resin is formed and laminated on the dial-shaped substrate, the outer diameter shape of the dial is obtained by pressing. This is a process that can be carried out in any dial processing process, and it is also a process with few problems.Furthermore, other effects of the present invention include:
As a by-product, the transfer surface of the ultraviolet-transparent transfer mold can be precisely molded into various shapes according to design requirements. As described above, according to the present invention, it is possible to form a transparent resin layer with a smooth mirror surface on a colored resin very easily, and a dial plate with a beautiful design can be provided at a low cost, which is of great significance as a dial processing method. It is something that has.

[Brief explanation of the drawing]

FIG. 1 is a partial process diagram showing a dial processing process according to the present invention. (α) It is a sectional view showing a process of forming a transparent resin layer with a smooth mirror surface on a dial substrate using a photocurable resin. 1. Standard substrate material for the dial λ A bottle for fixing the dial to the watch body Base layer for forming a transparent resin layer 4. Ultraviolet-transparent transfer mold with a smooth mirror surface as a transfer surface & thick resin layer Control stopper industry light-curing resin leakage prevention weir. & Photocurable resin Ibl A sectional view showing a laminate in which a photocurable resin is hardened and formed on a regular substrate material for a dial. (C) A cross-sectional view showing the laminated plate after the outer diameter has been removed into a dial shape. FIG. 2 is a partial process diagram showing the process of the present invention when the transfer surface of the ultraviolet-transparent transfer mold has a curved surface. (α) A cross-sectional view showing a process of forming a transparent resin layer with a smooth mirror surface on a dial substrate using a photocurable resin. (h) A cross-sectional view showing a laminate in which a photocurable resin is hardened and formed on a dial shaped material substrate. (,-3 A cross-sectional view showing the above laminated plate after the outer diameter has been cut out into a dial shape. Figure 3 is a partial process diagram according to the conventional technology. (α) Before applying the transparent paint, a base layer was formed. Cross-sectional view of the dial plate. (b)) Cross-sectional view of the dial plate after spraying the transparent paint many times to form the second layer 7. Z Second layer tC) formed by spraying transparent paint multiple times
A cross-sectional view of a dial plate with a polished second layer of transparent paint. Applicant Seiko Epson Co., Ltd. Agent Patent Attorney Kizobe Suzuki (and 1 other person)

Claims (1)

[Claims] A colored resin layer is formed as the first layer on the shaped material for the dial board, and a transparent photocurable resin layer with a smooth surface is applied as the second layer using ultraviolet rays using a transparent transfer mold with a mirror transfer surface. A method for manufacturing a dial plate, which is characterized by forming a mirror-like surface while being cured, and then press-cutting into a dial shape.