JPH09161598A - Push-on switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the operation sounds when a switch is depressed and stabilize the operating feeling. SOLUTION: The central part of a resilient metal sheet is cut and bent into a tab form to generate a movable contact 11, which is placed on stationary contacts 3A, 3B on the bottom surface of a box-shaped switch case 10, and a seal plate 12 consisting of a heat-resistant resin film whose central part is subjected to a drawing process into a diaphragm shape, is affixed to the open end face 10A of the switch case, and thereby the operating sound when the switch is depressed remains low while a clear sense of clicking is obtained. Thus push-on switches having less dispersion in the sense of operating can be produced.

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 for operating buttons of various electronic devices.

[0002]

2. Description of the Related Art A conventional push-on switch will be described with reference to the sectional view of FIG.

In the figure, reference numeral 1 denotes a box-shaped switch case made of molded resin, and outer fixed contacts 3A and 3B connected to a connection terminal 2 and a central fixed contact 5 connected to a connection terminal 4 are insert-molded on the bottom surface thereof. The outer peripheral lower end of the diaphragm-shaped movable contact 6 made of an elastic metal thin plate is placed on the outer fixed contacts 3A and 3B to form a switch contact.

A seal plate 7 made of a heat-resistant resin film is adhered to the outer peripheral portion of an end face 1A of the opening of the box-shaped switch case 1 with an adhesive 8, and the lower surface is the central apex of the diaphragm-like movable contact 6. It is fixed so that it touches the part.

The operation of this switch is performed by pushing the center of the seal plate 7 with the operation button of the equipment used and bending it downward.
By pushing the central portion of the diaphragm-shaped movable contact 6 downward, the diaphragm-shaped movable contact 6 is inverted with a feeling of moderation, and the back surface of the central portion contacts the central fixed contact 5, and the outer fixed contacts 3A, 3B and the central fixed contact 5 And the connection terminals 2 and 4 are electrically connected. After this,
When the force for pushing the central part of the seal plate 7 is removed, the original state of FIG. 5 is restored by the elastic restoring force of the diaphragm-shaped movable contact 6 and the seal plate 7, and the connection terminals 2 and 4 are opened again. .

[0006]

As the performance of electronic equipment has become higher and higher, the demand for electronic parts has diversified. For example, in equipment equipped with a sound collecting microphone, the switch operation sound of an operation button may be recorded. Therefore, there is a sense of moderation in the switch operation, but it is required to make the operation sound as low as possible, and to make a low-frequency sound even if the sound is emitted.

However, in the above-mentioned conventional push-on switch, when the switch is operated, the diaphragm-like movable contact 6 made of a thin metal plate is inverted with a feeling of moderation and abuts on the central fixed contact 5 made of a metal plate at a high speed. There was a problem of producing a high-frequency metallic sound.

Furthermore, the opening end face 1A of the switch case 1
Since the resistance of the sealing plate 7 that adheres to the diaphragm-shaped movable contact 6 to the flexure varies depending on the bonding state, when pressing the center of the sealing plate 7 with the operation button to reverse the diaphragm-shaped movable contact 6. There is also a problem in that the moderation feel of the operation button, that is, the feeling of being transmitted to the operator's hand varies.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a push-on switch with a small operation sound and a stable operation feeling transmitted to an operation button.

[0010]

In order to solve the above problems, in the push-on switch of the present invention, the movable contact placed on the outer fixed contact on the bottom surface of the switch case is formed by cutting the central portion of the elastic metal thin plate into a tongue shape. Bending is performed, and the central portion of the heat-resistant resin film sealing plate bonded to the end face of the opening of the switch case is drawn upward in a diaphragm shape.

Therefore, according to the present invention, the reversing operation by the diaphragm portion of the resin film sealing plate is replaced with the reversing operation by the diaphragm portion of the metal plate movable contact during the switch operation, so that there is a feeling of moderation. The sound is reduced, and since the click feeling is not affected by the bonding state of the seal plate to the switch case, the variation in the operation feeling is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a box-shaped switch case made of molded resin, in which an outer fixed contact and a central fixed contact integrated with a connection terminal are fixed to the bottom surface by insert molding. The central part is cut and bent upward in the shape of a tongue, the movable contact made of elastic thin metal plate is placed on the outer fixed contact in the switch case, and the central part is drawn upward to form a diaphragm, and the outer peripheral part Is composed of a seal plate made of a heat-resistant resin film adhered to the end face of the opening of the switch case, and because the diaphragm part of the seal plate made of a resin film causes a reversing operation, it has a moderation feeling, and It has the effect of reducing the operating noise.

A push-on switch according to an embodiment of the present invention will be described below with reference to FIGS.

In the present embodiment, the same parts as those described in the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the sectional view of FIG. 1, the feature of the present embodiment is that the diaphragm-like movable contact 6 made of an elastic metal thin plate in the above-mentioned conventional structure is shown in the plan view and front view of FIG. The configuration shown, that is, the flat plate portion 11A on the outer periphery
And the movable part 1 cut in the shape of a tongue in the center and bent upward
1B and a movable contact 11 composed of a connecting portion 11C therebetween, and a seal plate 7 made of a heat-resistant resin film.
The configuration shown in the front view and the bottom view of FIG. 3, that is, the flat plate portion 12A on the outer periphery and the diaphragm-shaped drawn portion 1 at the center.
2B and an adhesive layer portion 12C on the lower surface of the outer periphery to form the seal plate 12.

The movable contact 11 is a peripheral flat plate portion 11A.
Is the outer fixed contacts 3A, 3B on the bottom surface of the switch case 10.
The tongue-shaped movable portion 11B at the center is placed on the upper side and is bent upward so as to maintain a constant insulation distance from the central fixed contact 5, and the seal plate 12 is provided with an adhesive layer portion 12C on the lower surface of the outer periphery.
Is fixed to the opening end surface 10A of the switch case 10 by adhesion.

Next, the operation of this push-on switch is to push down the diaphragm-shaped drawn portion 12B at the center of the seal plate 12 with the operation button 13 of the equipment used, as shown by the arrow in the sectional view of FIG. Depending on the drawing part 12
B reverses with a sense of moderation, and its back surface pushes the tongue-shaped movable portion 11B of the movable contact 11 downward and presses it against the central fixed contact 5, so that the outer fixed contacts 3A, 3
B is electrically connected to the central fixed contact 5, that is, between the connection terminals 2 and 4.

When the diaphragm-shaped drawn portion 12B at the center of the seal plate 12 is pushed downward, the base portion 12D of the drawn portion on the outer periphery of the seal plate 12 sinks downward, so that the outer peripheral flat plate portion of the movable contact 11 at this portion. 11A is the outer fixed contact 3
It is pressed against A and 3B to stabilize the contact between them.

After that, the seal plate 1 is pressed through the operation button 13.
2 excluding the pressing force applied to the diaphragm-shaped drawn portion 12B at the center of FIG. 2 by the elastic restoring force of the drawn portion 12B of the seal plate 12 and the tongue-shaped movable portion 11B of the movable contact 11. The state is returned to the open state between the connection terminals 2 and 4.

[0020]

As is apparent from the above-described embodiment of the present invention, since it is the diaphragm portion of the seal plate made of the heat-resistant resin film that reverses when the push-on switch is operated, it is made of the conventional elastic metal plate. Compared to the reversing operation of the diaphragm portion, the reversing operation sound is small and becomes a low frequency sound, and the moderation can be clearly felt.

Further, since the movable contact and the fixed contact are brought into contact with each other, the tongue-shaped movable portion made of the elastic metal thin plate is pressed against the fixed contact by the reversing operation of the resin film diaphragm portion against the elasticity. It does not hit too rapidly and the contact noise is not loud.

Further, when the diaphragm-shaped drawn portion of the seal plate is reversed, the peripheral adhesive portion is not pulled unlike the conventional case, so that it is not affected by the adhesive state of the seal plate to the switch case. Therefore, there is no variation in the operation feeling due to the variation in the adhered state.

As described above, the present invention has a very high practical value.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a push-on switch according to an embodiment of the present invention.

FIG. 2 (a) is a plan view of a movable contact, which is the main part, and (b) is a front view thereof.

FIG. 3 (a) is a front view of a seal plate, which is the main part, and (b) is a bottom view of the same.

FIG. 4 is a sectional view when the push-on switch is operated.

FIG. 5 is a sectional view showing the configuration of a conventional push-on switch.

[Explanation of symbols]

 2, 4 Connection terminals 3A, 3B Outer fixed contact 5 Central fixed contact 10 Switch case 10A Opening end face 11 Movable contact 11A Outer peripheral flat plate part 11B Tongue-shaped movable part 11C Connecting part 12 Seal plate 12A Outer peripheral flat plate part 12B Diaphragm drawing part 12C peripheral lower surface adhesive layer

Claims (1)

[Claims] 1. A box-shaped switch case made of a molded resin, in which an outer fixed contact and a central fixed contact integrated with a connection terminal are fixed to a bottom surface by insert molding, and a central portion is cut and bent upward in a tongue shape, A movable contact made of an elastic thin metal plate placed on the outer fixed contact inside the switch case, and a heat-resistant resin film in which the central part is drawn upward into a diaphragm shape and the outer periphery is adhered to the opening end face of the switch case. Push-on switch consisting of a seal plate made of steel.