JPH0652752A - Push button switch - Google Patents

Abstract

PURPOSE:To reduce sound generated from a push button switch, in the push button switch used for various electronic apparatus. CONSTITUTION:A second cam lobe 4b is provided on a cam portion 4 for obtaining click feeling. Sound generated when a lever 3 touches a cover can be reduced without increasing the number of parts by regulating the movement of the lever 3 through the pressure contact of a blade spring curved portion 5a to the cam lobe 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch used in various electronic devices.

[0002]

2. Description of the Related Art The structure of a conventional switch of this type is shown in FIG. According to the figure, a box-shaped case 2a having an opening on the upper surface having terminals 8a forming a switch pattern 8b on the inner side surface, a cover 1a which is combined with the case 2a in the form of a lid, the case 2a and the case 2a Cover 1a
A lever 3a inserted in the inside of the lever so as to be vertically movable, a contactor 6a incorporated in the lever 3a and sliding on the surface of the switch pattern 8b, and a cam provided on the side surface of the lever 3a to obtain a click feeling. A leaf spring 5b having a portion 4c and a curved portion 5c that comes into pressure contact with the cam portion 4c and is attached to either the cover 1a or the case 2a.
And a coil spring 7a that is inserted between the lever 3a and the bottom surface of the case 2a to bring the lever 3a into contact with the cover 2a.
And the damper 9 mounted on the cover 1a.

[0003]

However, in the above conventional structure, the lever 3a is covered by the damper 9 by the cover 1a.
Since the sound that abuts against is reduced, it has a drawback that the number of parts and the number of assembling steps increase. The present invention solves such a problem, and an object of the present invention is to efficiently produce and provide a switch suitable for a quiet place with a low noise.

[0004]

In order to solve the above problems, the push button switch of the present invention is provided with a cam portion having a first cam lobe and a second cam lobe on the side surface of the lever, and
Just before the lever comes into contact with the cover by being urged by a spring inserted between the lever and the bottom surface of the case, a leaf spring that slidably contacts the second cam mountain and restricts the movement of the lever is attached to the case or the cover. It was done.

[0005]

As described above, since the leaf spring is slid on the second cam lobe, even if the lever is biased by the spring inserted between the lever and the bottom surface of the case, the force with which the lever abuts the cover. Is softened and the collision noise can be reduced.

[0006]

FIG. 1 is a diagram showing an embodiment of the push button switch of the present invention.
Will be described. Reference numeral 1 is a cover, 2 is a case, 3 is a lever, 4 is a cam portion provided on the lever 3, and has a first cam lobe 4a and a second cam lobe 4b. Reference numeral 5 denotes a leaf spring mounted on the cover 1, and has a leaf spring curved portion 5a at the tip.
have. Reference numeral 6 is a contactor, which is mounted on the lever 3 so as to come into sliding contact with a terminal 8 formed integrally with the case. Further, the lever 3 is provided with a rounded portion (hereinafter referred to as R) portion at the tip of the elastic portion 12 that comes into contact with the cover 1, and an inclined portion 11 is provided at the portion that comes into contact with the cover 1 side. Incidentally, 7 is a spiral spring, and 8 is a terminal having a terminal pattern 8c.

Next, a mechanism for reducing the collision noise will be described with reference to FIG. 5a is regulated by the second cam crest 4a and generates a force in the opposite direction. Further, when the R portion 10 at the tip of the elastic portion 12 which is a part of the lever 3 comes into contact with the inclined portion 11 of the cover 1, the elastic portion 12 is deformed, and this deformation causes friction between the R portion 10 and the inclined portion 11. Generates force and absorbs impact force.

As described above, according to the above-described embodiment, since the force of the lever 3 abutting on the cover 1 is reduced, it is possible to reduce the sound generated by the abutment.

FIG. 3 is a sectional view of another embodiment of the push button switch of the present invention. Explaining only the points different from the embodiment of FIG. 1, a wall portion 4c is provided in place of the second cam lobe. The elastic portion 12 is deleted. With this configuration, the wall portion 4c and the leaf spring tip portion 5b come into contact immediately before the R portion 10 comes into contact with the inclined portion 11, and when the R portion 10 and the inclined portion 11 come into contact, the impact force at the time of contact comes into contact with the inclined portion. Since it is dispersed by 11, the sound due to contact can be reduced.

Further, in the above embodiment, the push button switch having no lock mechanism has been described. However, in the push button switch with the lock mechanism, the lever 3 immediately contacts the cover 1 when the lock is released. Of course, the impact caused by the abutment is large, and a larger effect can be obtained, which is of course within the scope of the present invention.

[0011]

As is apparent from the above-described embodiment, the present invention constitutes the sound deadening mechanism for cushioning the impact by the existing cam parts provided for moderation, or the existing parts such as the lever and the cover. It is possible to provide an inexpensive switch that can reduce impact noise generated at the time of switching without increasing the number of steps.

[Brief description of drawings]

FIG. 1 is a partial sectional perspective view of an embodiment of a push button switch of the present invention.

FIG. 2 is a sectional view of the same side.

FIG. 3 is a side sectional view of the other embodiment.

FIG. 4 is a side sectional view of a conventional push button switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cover 2 case 3 lever 4 cam portion 4a first cam mountain 4b second cam mountain 4c wall portion 5 leaf spring 5a leaf spring curved portion 5b leaf spring tip portion 6 contact 7 coil spring 8 terminal 10 arel (R) Part 11 Inclined part 12 Elastic part

Claims (4)

[Claims] 1. A box-shaped case having an opening on an upper surface having terminals forming a switch pattern on an inner side surface thereof, a cover assembled by covering the case with a lid, and a vertical movement inside the case and the cover. A lever that can be inserted, a contact that is incorporated in the lever and slides on the surface of the switch pattern, and a cam portion that is provided on the side surface of the lever and that has a first cam crest and a second cam crest. This first
A click feeling is obtained by crossing the cam lobe of No. 2, and a curved portion regulated by the second cam lobe is formed immediately before the lever comes into contact with the cover by the coil spring inserted between the lever and the bottom surface of the case. A push-button switch including a leaf spring mounted on at least one of the case and the cover. 2. The push button switch according to claim 1, further comprising a wall portion with which the tip of the leaf spring abuts instead of the second cam lobe. 3. A box-shaped case having an opening on an upper surface having terminals forming a switch pattern on an inner side surface thereof, a cover combined with the case by covering the case, and a vertical movement inside the case and the cover. A lever that is inserted so that it can slide on the surface of the switch pattern and that abuts against the cover by a coil spring that is inserted between the contact and the bottom of the case, and the contact portion between the lever and the cover. A push button switch composed of an inclined part and a rounded part. 4. The push button switch according to claim 3, wherein the contact portion of the lever or the cover is formed into an elastic body.