JPS5838977Y2 - switch device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a switch using a printed wiring board, and aims to provide a switch with a simple configuration, low cost, and high reliability.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing one embodiment thereof.

In the figure, reference numeral 1 denotes a printed wiring board on which a circuit of a wireless device or the like is constructed, and conductors 2, which serve as a plurality of contacts, are formed of copper foil at predetermined positions on the printed wiring board 1.

Reference numeral 3 denotes a dome-shaped elastic body made of a rubber material or the like, in which a contact 4 made of conductive rubber or the like is formed on the lower surface of the central part of the inner surface by insert molding or the like; In a steady state, when the center portion 5 is not pressed, it is separated from the conductor 2, and it is formed so that it can come into contact with the conductor 2 only when the center portion 5 is pressed.

On the other hand, above the substrate 1 and the elastic body 3, a push button 7 for operation and a support 8 such as a cabinet for supporting the push button 7 are provided. It is inserted into the hole 9 and attached so that its flange portion 10 abuts the lower surface of the support 8 and does not fall off.

The lower surface of the push button 7 is in contact with the upper surface of the center part 5 of the elastic body 3, and when the push button 7 is pressed, the center part 5 is pressed and moved downward so that the contact 4 comes into contact with the conductor 3.

Further, the support body 8 is provided with a rib 11 that presses and clamps the peripheral flange portion 6 of the elastic body 3 against the printed wiring board 1.

The above is the basic configuration of a push button switch, but this embodiment also includes a configuration that allows the switch to be held (locked) in a closed state.

That is, as shown in the figure, a large-diameter portion 13 is formed at the lower end of the through hole 9 provided in the support 8, and a stepped portion 14 is formed on the lower surface of the portion.
, and a groove 15 for locking is provided.

Furthermore, a small protrusion 16 that fits into the groove 15 is provided on the upper surface of the flange portion 10 of the push button 7.

Therefore, by rotating the push button 7 while being pressed,
The flange portion 10 is brought into contact with the stepped portion 14 and held in a pressed state, and this state is held by engagement between the groove 15 and the small protrusion 16.

In addition, 17 is a protrusion provided on the top surface of the push button 7 to prevent slipping during rotation, 18 is a grooved line for indicating the rotational position, and 19
is a decorative plate provided on the surface of the support body 8.

With this configuration, this switch is normally in the first position.
The state will be as shown in the figure.

That is, the lower surface of the push button 7 is pressed upward by the elastic body 3, and the push button 7 is urged in the protruding direction and pressed against the support body 8.

Therefore, even when used in a radio receiver or the like, the push button 7 does not rattle, and there is no fear that the push button 7 will vibrate with the vibration of the speaker and generate abnormal noise.

Next, when the push button 7 is pressed with a finger, it moves downward as shown in FIG. 2, and its lower surface presses the center portion 5 of the elastic body 3 downward.

Therefore, during the pressing, the contact 4 comes into contact with the two conductors 2, and the switch is turned on.

Furthermore, since the center portion 5 of the contactor 4 is pressed until it is slightly compressed, the reliability of the switch-on operation is improved.

Furthermore, it is possible to increase the allowable value of dimensional errors in each part, which is advantageous in that manufacturing accuracy can be relaxed.

Furthermore, the presence of a slight stroke even after the switch is turned on improves the feel during operation, making it possible to obtain a switch with good operability.

Furthermore, when the push button 7 is rotated a little while being pressed in this way, the flange 1 of the push button 7 is rotated as shown in FIG.
0 can be engaged with the stepped portion 14 of the support body 8, and the pressed state can be maintained by the engagement between the groove 15 and the small protrusion 16.

With the above configuration, according to the present invention, the push button is pressed against the holding body material by the elasticity of the elastic body such as rubber, and the vibration of the push button and the generation of resonance noise due to the vibration of the speaker of a wireless device, etc. can be prevented. It can be prevented.

Further, the elastic body can press the push button excessively to bring the push button into sufficient contact, and the conductor and the contact can be reliably connected without coming apart.

Furthermore, by molding conductive rubber or the like as a contact, it is very easy to make a large number of contacts, and the contact does not deform during assembly unlike when it is made of a leaf spring or the like.

In addition, it can be installed directly on a printed wiring board that constitutes a circuit of a wireless device, etc., making it easy to assemble and reduce costs.

Furthermore, a dome-shaped elastic body with a conductive contact can also form multiple dome-shaped structures at the same time.
This is even more advantageous in terms of cost when a large number of switches are lined up.

Further, unlike an elastic body such as a leaf spring, by using only the portion corresponding to the contact as a conductor, it is possible to eliminate the inconvenience that each contact is electrically conductive.

A support provided with ribs that supports the push button so that it can be rotated and pressed, and that presses and fixes the flange on the outer periphery of the dome-shaped elastic body that has the contact to the printed wiring board that has the switch contact. A step is provided on the inner surface of the body, a flange provided on the outer periphery of the push button is engaged with the step, and a groove is provided in the step with which a small protrusion provided on the flange of the push button is engaged. Because of this, when the push button is pressed and rotated, the small protrusion engages with the groove of the stepped portion, thereby locking the pressed state of the push button.

As mentioned above, the locking mechanism consists of a small protrusion on the flange on the outer periphery of the push button and a groove on the step on the inner surface of the support, so it has the advantage of a simple structure and reliable locking. .

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of a switch device according to an embodiment of the present invention, FIG. 3 is a cross-sectional side view of a portion thereof, and FIG.
The figure is a top view of the printed circuit board and contacts, and FIG. 5 is a bottom view of the push button and support. 1... Printed circuit board, 2... Conductor,
3...Elastic body, 4...Contact, 5...
...Central part, 6...Flange part, 7...
...Push button, 8...Support, 9...Through hole, 10...Flange portion, 11...Protrusion, 12...・Protrusion, 13...Large diameter part,
14...Step part, 15...Concave groove, 16.
...Small protrusion.

Claims (1)

[Scope of utility model registration request] A dome-shaped printed wiring board provided with a pair of conductors serving as switch contacts, and a contactor provided on the side of the printed wiring board where the conductors are provided to short-circuit between the pair of conductors. an elastic body; a support body provided with a rib for fixing the elastic body by pressing a flange portion on the outer periphery of the elastic body against the printed wiring board; The push button is supported and is biased in one direction by contacting the elastic body, and the inner surface of the support body is provided with a step portion to which a flange portion provided on the outer periphery of the push button is engaged. A concave groove is provided in the flange portion of the push button, and when the push button is pressed and rotated, the small protrusion engages with the concave groove of the stepped portion, and the push button is pressed. A switch device configured to lock the state.