JPH05290675A - Push-on switch - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a push-on switch for switching various signals used in electronic equipment, and to provide a thinner push-on switch. [Structure] The first heat-resistant film 1a is attached to a fixed contact terminal plate 2e with an adhesive, and the fixed contact portion 4 is provided on the opposite surface.
The second heat resistant film 8 is attached with an adhesive so that a and 5a are exposed, and then the terminal portions 2a, 2b, 2c,
By cutting 2d, the thickness of the switch can be made extremely thin, and by making the film highly heat resistant, a surface mounting (reflow soldering) type push-on switch can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-on switch used as various signal changeover switches for consumer and industrial electronic equipment.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. As shown in FIG. 1, reference numeral 1 denotes a plastic case having an opening at the upper side thereof, and on the bottom surface thereof, an outer fixed contact integrated with a circuit connecting terminal portion 2 and another circuit connecting terminal portion 3
A central fixed contact 5 integrated with the above is provided by insert molding. Reference numeral 6 denotes a dome-shaped movable contact made of an elastic metal thin plate, the outer peripheral end of which is in constant contact with the outer fixed contact 4. Reference numeral 7 denotes a semitransparent sealing film made of a flexible insulating sheet, which seals the inside of the case 1 by adhering a portion in contact with the open end surface of the case 1 with an adhesive.

The operation of the conventional push-on switch described above will now be described. When the central portion of the sealing film 7 is pushed downward, the central portion of the movable contact 6 is bent downward to contact the central fixed contact 5. , The switch circuit is closed. Further, when the downward pushing force is removed, the movable contact 6 returns to the original dome shape and is separated from the central fixed contact 5, so that the switch circuit is opened.

[0004]

However, in the above-mentioned conventional push-on switch, the outer fixed contact 4 integrated with the circuit connecting terminal portion 2 and the other circuit connecting terminal portion 3 is formed.
Also, since the central fixed contact 5 is insert-molded with plastic, the thickness of the case 1 cannot be reduced, and there is a limit to the thinning of the push-on switch.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an excellent push-on switch capable of extremely thinning the switch.

[0006]

In order to solve the above-mentioned problems, the present invention forms a fixed contact terminal portion by attaching a thin high heat resistant film to a fixed contact terminal plate.

[0007]

As described above, according to the present invention, the thickness of the switch can be made extremely thin by attaching the thin highly heat resistant film to the fixed contact terminal plate and forming the fixed contact terminal portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the push-on switch of the present invention will be described with reference to FIG. According to the figure, 1a is an insulating first
It is affixed with an adhesive to the fixed contact terminal plate 2e which forms a thin metallic fixed contact terminal portion with the high heat resistant film.
Reference numeral 8a is a second high heat-resistant film which serves as a spacer, and is cut out so as to expose the outer fixed contact portion 4a and the central fixed contact portion 5a of the fixed contact plate 2e and attached with an adhesive. Reference numeral 6a denotes a dome-shaped movable contact made of an elastic metal plate, the outer peripheral end of which is arranged so as to be in constant contact with the fixed contact portion 4a.

Reference numeral 7a denotes a third high heat resistant film which is attached to the fixed contact terminal plate 2e with an adhesive so as to cover the movable contact 6a. After that, by cutting the terminal portions 2a, 2b, 2c, 2d of the fixed contact terminal plate 2e,
A push-on switch will be formed.

As described above, according to the above embodiment, the fixed contact terminal plate 2e does not need to be insert-molded with plastic, and the fixed contact terminal portion can be made extremely thin by attaching a thin film with an adhesive. The push-on switch can be made extremely thin.

3 to 7 show other embodiments of the present invention. The same parts as those of the embodiment of FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted to explain the embodiments of the respective drawings. Then, in the push-on switch of the embodiment of FIG. 3, an insulating film portion 8b is provided by printing in the vicinity of the central fixed contact portion 5a of the fixed contact terminal plate 2e to prevent conduction with the movable contact 6a.

In the push-on switch of the embodiment shown in FIG. 4, after attaching the first insulating film strip 1b and the fixed contact terminal plate 2e, the outer fixed contact portion 4b and the central fixed contact portion 5b are attached to the fixed contact terminal plate 2e. It is formed by etching.

The push-on switch of the embodiment of FIG.
As shown in FIG. 6, a conductive paste 6c is formed on the insulating film 6b.
The movable contact 6d is formed into a dome shape after the formation of.

[0014]

As is apparent from the above embodiment, the present invention forms a fixed contact terminal portion by adhering a thin film to a fixed contact terminal plate, and a switch formed by conventional plastic insert formation. Compared to the case, it has the advantage of being thinner, and
Furthermore, by making the film highly heat resistant,
It is also possible to provide a push-on switch that can be reflow-soldered.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a push-on switch that is an embodiment of the present invention.

FIG. 2 is a sectional view of the same side

FIG. 3 is an exploded perspective view of the other embodiment.

FIG. 4 is an exploded perspective view of the other embodiment.

FIG. 5 is an exploded perspective view of the other embodiment.

FIG. 6 is a side sectional view of a movable contact which is a main part of another embodiment of FIG.

FIG. 7 is a perspective view of a conventional push-on switch.

FIG. 8 is a sectional view of the same side.

[Explanation of symbols]

 1a 1st high heat resistant film 2a-2d Terminal part 2e Fixed contact terminal plate 4a Outer fixed contact part 5a Central fixed contact part 6a Moving contact 7a Third high heat resistant film 8a Second high heat resistant film

Claims (1)

[Claims] 1. A fixed contact terminal plate having at least a first insulating film, an outer fixed contact portion and a central fixed contact portion attached to the first insulating film, the outer fixed contact portion, and a center. A push composed of a spacer provided on the fixed contact terminal plate so that the fixed contact portion is exposed, and a movable contact arranged on the spacer so that the outer peripheral end is always in contact with the outer fixed contact portion for conduction. On switch.