JPH0955142A - Manufacture of coned disk spring-shaped thermoplastic resin switch equipped with push piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight and small-sized switch having a good clicking feeling, by making a switch by injecting a thermoplastic resin after a film is molded by the use of a male die of desirable shape having an injection gate and a female die of desirable shape. SOLUTION: A resin film 1 is molded by the use of a male die 'A', which has an injection gate 'a' in its central part and a projecting part equipped with a dish-shaped recessed part, and a female die 'B', which is recessed in a dish shape in its central part and is equipped with a recessed part 'C' for forming a strike part in its bottom center for molding a strike part. Nextly, when thermoplastic resin is injected from the gate 'a', a push piece part 3, a strike part 4 and the like are formed in the molded article or the film 1 without any slippage, and a small-sized, lightweight, coned disk spring-shaped thermoplastic resin switch equipped with a push piece giving a good clicking feeling is thereby realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a disc spring switch with a pusher incorporated in a push button switch used as an operation switch as a control input section for consumer and industrial equipment.

[0002]

To produce a conventional contact rubber, a thermosetting elastomer, or a thermoplastic elastomer is used in order to obtain a feeling of clicking and a molding feeling, so that a finger is touched. In order to change the feel of the hitting surface, it is necessary to post-process the hitting surface by painting, printing, bonding, etc. after molding, which is troublesome.

Further, in order to design the shape to obtain a click feeling, the main body stroke is required to be 0.6 mm or more, and it is difficult to obtain a switch having a short stroke feeling. In addition, in order to obtain a click feeling again, the strength of the base portion, which is also made of an elastic body, is required, which causes the base portion to have a thickness, which increases the weight and bulk of the entire switch.

In order to give the switch a click feeling,
There is a structure in which a disc spring is installed, but in this case, the number of parts increases and the assembling process also increases, so that the manufacturing time and the manufacturing unit price increase.

Further, the disc spring must be positioned below the striking portion in alignment with each other, which increases the labor for assembling and has a drawback that a click feeling cannot be obtained when there is a positional deviation. There is.

[0006]

Therefore, according to the present invention, at the same time as molding a Belleville spring-shaped body of a thermoplastic resin film,
Since a beating portion and a pusher made of a thermoplastic resin or a thermoplastic elastomer are injected and heat-fused for integral molding, the molding can be performed in one step and the manufacturing can be simplified. Since the tapping portion can be made of any material, it is possible to adapt to changes in the material and obtain various touches on the tapping surface. Further, since the hitting portion is precisely positioned by the molding die, the hitting portion is not displaced from the disc spring and the integrated switch body, and a good click feeling can be expected. Furthermore, since the base portion is also integrally formed of a thermoplastic film or the like, sufficient rigidity can be obtained, and therefore, the weight and the size can be reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An injection gate a is formed in the center, and a cylindrical concave portion b in the shape of a pusher is formed on the top of a male mold A which is convex in a dish shape. The mold B has an inverted dish shape, and a cylindrical concave portion C having a shape of a hitting portion is formed at the center of the bottom.

A thermoplastic resin film 1 is inserted between the two molds to close the molds, and at the same time, a thermoplastic resin or a thermoplastic elastomer is injected from an injection gate a. The mold is heated to 60 ° C. to 90 ° C. for injection molding, and the main body 2, the pusher 3 and the tapping part 4 are integrally molded by the mold heat and the resin heat. By injection molding, the thermoplastic resin film 1 is penetrated by its injection pressure, the resin is injected up to the recess C of the female die B, and the resin film and the pusher and the tapping portion are heat-sealed.

Incidentally, a minute hole may be preliminarily formed in the center of the thermoplastic resin film 1 so that the thermoplastic resin film 1 can be injected into the female mold B. However, even if there is no hole, the hole can be easily opened by the resin heat and injection pressure due to injection.

Further, by printing a character pattern 5 or the like on a thermoplastic resin film in advance on the bottom of the female die C and loading the same, a switch having a display of characters or the like on the top surface of the hitting portion 4 is manufactured. it can.

As described above, according to the present invention, the switch can be manufactured by one molding process. Then, it is possible to surely obtain the desired clicking sensation without shifting the positions of the hitting portion, the disc spring-shaped main body portion, and the pusher.

[0012]

[Example] A thermoplastic resin film 1 (Toray: Lumirror S) is inserted between the male mold A and the female mold B, the mold is closed, and the thermoplastic resin (JSR: ABS55) is injected by an injection molding machine. . At this time, the resin film 1 is formed into a disc spring shape by the heat of the mold and the heat of the resin.

The injected resin molds the pusher 3 in the male mold A, the resin film 1 penetrates by the injection pressure, and the injected resin reaches the female mold B to mold the hitting portion 4 and, at the same time, the resin film. The 1 and the pusher 6 and the tapping part 4 are heat-sealed on the surface, and firmly integrated.

Further, if a display section 5 on which characters or the like are printed with a thermoplastic resin film or the like is preliminarily loaded on the bottom surface of the recess C for molding the hitting section of the female die B, the switches including this display section It can be manufactured in one step.

[Brief description of drawings]

FIG. 1 is a view showing a mold separately.

[Fig. 2] Diagram during molding

[Figure 3] Product diagram

[Explanation of symbols]

 A Male mold B Female mold a Injection gate b. c recessed part 1 resin film 2 disc spring 3 pusher part 4 tapping part 5 display part

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[Procedure amendment]

[Submission date] October 4, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

Claims (2)

[Claims] 1. A male mold having an injection gate in the center, a central part convex in a dish shape, and a concave part for molding the pusher part at the top thereof, and a central part having a concave dish shape. And, with a female mold having a recess for beating part molding in the center of the bottom, a thermoplastic resin film is placed between the two molds, and the thermoplastic resin is injected at the same time as closing the mold, A manufacturing method of a switch in which a conical spring body of a thermoplastic resin film and a pusher portion and a hitting portion are integrally formed. 2. The method for manufacturing a switch according to claim 1, wherein a film on which characters and the like are printed is loaded in the bottom of the recess for molding the hitting portion of the female die.