JPH073548Y2 - Push button switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention has a knob that is recoil-type pressed on a case surface, and a light-emitting body that illuminates the knob surface in the case and a light-emitting body of this light-emitting body. The present invention relates to a counter contact type push button switch in which fixed contacts are arranged at both sides and a movable contact bridging these fixed contacts is attached to a lower end portion of a knob.

[Conventional technology]

FIG. 4 shows a conventional recoil push button switch 1 of this type. That is, the lamp 6 for illuminating the mark 3a is attached to the perforation 5a formed at a position facing the mark 3a of the knob 3 on the substrate 5 in the case 2, and the copper foils 5b on both sides thereof are raised in a hemispherical shape. The fixed contact 7 is fixed. At the lower end of the knob 3, a light projecting window 8b is formed in the center and a conductive metal plate 8 having a shape that can face the fixed contact 7 is formed.
Is installed. The movable contact 8a is formed by raising both sides of the conductive metal plate downward.
Are formed. Further, a compression spring 9 for urging the knob 3 to the original position is mounted in the gap between the lamp 6 and the contacts 7, 8a, and when the knob 3 is pushed against this spring force, the fixed contacts 7 on both sides move. The contact 8a is contacted and short-circuited through the conductive metal plate 8, and the copper foils 5b are energized to perform a desired circuit operation. When the hand is released, the spring 9 restores the original position and the short circuit between the fixed contacts 7 is released.

[Problems to be solved by the device]

However, in this type of push-button switch 1, since the fixed contacts 7 are arranged on both sides of the lamp 6, the shape of the conductive metal plate 8 naturally becomes large, and the movable contact 8a thereof is also increased.
In order to secure the reliability of the contact operation between the fixed contact 7 and
Processing and assembly must be performed with high precision, and there are problems in terms of material and manufacturing cost. Further, since the metal and metal are contacted with each other, a strong feeling of bottom-bottoming was generated during the operation.

Therefore, an object of the present invention is to provide a push button switch of the kind described at the beginning which can be manufactured at low cost and has an improved operation feeling.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides a rubber elastic body (19) having a hollow portion (19a) around each fixed contact (5c) and between the lower ends (13a) of the knobs (13). ) Is attached, and a conductive rubber (18) as a movable contact is attached to the lower end (13a) so as to project into the hollow portion (19a), at least each of the conductive rubbers (18) at the lower end (13a) is attached. A conductive surface is formed between the mounting surfaces.

[Action]

Usually, the conductive rubber (18) is separated from the fixed contact (5c) by the elastic body (19). When the knob (13) is pressed, the elastic body (19) is compressed, and the conductive rubber (18) comes into contact with both fixed contacts (5c) with a soft feeling due to its elasticity, and shorts the fixed contacts. To do.

[Example of device]

1 to 3 show a counter contact type recoil type push button switch according to an embodiment of the present invention. In these figures, the same symbols as in FIG. 4 indicate the same parts.

In FIG. 1, a knob 13 is slidably mounted on a case 2, a lamp 6 is attached to a substrate 5 inside the case 2 so as to face a mark 3a on the upper surface thereof, and fixed contacts are provided on both sides of the lamp 6 as they are. The edge of the copper foil, which functions as 5c, is printed to connect to the control circuit. The knob 13 is hollow and is made of a conductive metal and has a U-shaped lower end portion protruding from both sides thereof so as to face the fixed contact 5c.
13a is formed. These upper surfaces 13b contact the inner surface of the case 2 to define the original position.

At the lower end portion 13a, a rubber stepped cylindrical elastic body 19 (FIG. 2) having a hollow portion 19a is attached in a cap shape, and the bottom surface of the elastic body 19 abuts the periphery of the fixed contact 5c and the knob 13 is fixed. Biased to position. Further, a cylindrical conductive rubber 18 as a movable contact is attached to the lower end portion 13a so as to project into each hollow portion 19a.

As a result, when not in operation, the knob 13 is biased to the original position by the elastic body 19, and the conductive rubber 18 is separated from the fixed contact 5c. When the knob 13 is pushed, as shown in FIG. 3, the elastic body 19 is compressed, the conductive rubber 18 contacts the fixed contact 5c, and the fixed contact 5c is bridged by the conductivity of the knob 13 itself. At this time, the conductive rubber 18 exhibits elasticity and comes into contact with the fixed contact 5c, so that the operation feeling is soft.

In the above-described embodiment, the knob is made of synthetic resin, and the other conductive rubber 18 from the portion in contact with the conductive rubber 18 is used.
The conductive plating treatment may be applied only to the current path reaching the contact portion.

[Effect of device]

As described above, according to the present invention, the metal plate for the movable contact and the spiral spring for urging the original position are not required, and the use of the rubber material instead is advantageous in the manufacturing cost, and the dimensional accuracy or the assembly is improved. Variations in attachment accuracy can be absorbed and contact failure is less likely to occur. The fact that the movable contact is made of conductive rubber also leads to an improvement in the feeling of operation.

[Brief description of drawings]

1 is a longitudinal sectional view of a central portion of a push button switch according to an embodiment of the present invention, FIG. 2 is a perspective view of a movable contact portion of the same embodiment, and FIG. 3 is an operating state of the push button switch according to the same embodiment. FIG. 4 shows a conventional push button switch, FIG. 4a is a perspective view thereof, and FIG. 4b is A-A of FIG.
The line sectional view and the same figure c are perspective views of the contact portion. 5c ... Fixed contact, 13 ... Knob, 13a ... Knob lower end, 18 ... Conductive rubber, 19 ... Elastic body, 19a ... Hollow part.

Claims (1)

[Scope of utility model registration request] 1. A knob, which is recoil-type pressed, is attached to a case surface, and a knob surface illuminating light emitter is provided at a position facing the knob surface on a substrate in the case, and fixed contacts are provided at both sides of the light emitter. In a push-button switch of the opposed contact type, which is arranged and has two movable contacts facing each other, which short-circuit these fixed contacts at the lower end of the knob, in the vicinity of each fixed contact and between the lower ends of the knobs. , A rubber elastic body having a hollow portion is mounted, conductive rubber as a movable contact is attached to the lower end portion of the knob so as to project into the hollow portion, and at least each of the conductive rubber portions at the lower end portion of the knob is attached. The pushbutton switch is characterized in that the mounting surfaces are formed as conductive surfaces.