JPH0451416A - Rubber contact switch - Google Patents

Abstract

PURPOSE:To increase the adjustable range of the pitch and timbre of an operation sound by forming a throttle hole on a substrate section, which is to be surrounded with a rubber cap, forming a diffusion chamber which is equipped with another throttle hole communicating with the outside air, on the face of a substrate opposite to the contact side, and surrounding the throttle hole with the chamber. CONSTITUTION:The central section of a bottom case 7 is provided with an internal wall 8, which is in a ring shape and as high as a circumferential wall 7a, so that a diffusion chamber 8a in a disc shape having a larger diameter than a throttle hole 5 can be formed. In addition, the central position on the case face which forms the bottom face of the diffusion chamber 8a is provided with a throttle hole 8b by perforating. When a nob 11 is operated by push- pressing, a skirt part 14 of a rubber cap 10 bends so that a conductive body 13 contacts with contacts 4, 4a and becomes a bridge between them. At the same time, the air in a cavity is exhausted via the throttle hole 5, the diffusion chamber 8a and the throttle hole 8b to produce an operation sound. The pitch and timbre of the sound can be adjusted by the shapes of the throttle holes 5, 8b and the diffusion chamber 8a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method in which a rubber cap housing a conductor with a cavity left is brought into close contact with a substrate on which a mating contact is arranged, and the rubber cap is pressed to release the conductor. This relates to a rubber contact switch in which the air in the cavity is exhausted and an operation sound is generated when the rubber contact switch is brought into contact with a mating contact.

(Prior art) This type of switch was developed in Japanese Utility Model Application No. 62-64924 by providing a throttle in the air escape groove of the rubber cap, and when operated, the air inside the cap is compressed and discharged, producing an operating sound. It is well known that this is the case.

[Invention or problem to be solved]

However, in this case, since the air escape groove is formed on the cap side, the size of its diffusion portion is limited, and the range of adjustment of the pitch and tone of the operation sound is also limited.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rubber contact switch of the type mentioned at the beginning, which can widen the adjustment range of the pitch and tone of the operation sound.

(Another Means for Solving the Problem) In order to achieve this object, the present invention provides a method in which a rubber cap housing a conductor with a cavity left is brought into close contact with a substrate on which a mating contact is arranged. In Laher contact switches, which generate operation noise due to air being exhausted from the cavity when the conductor is pressed to contact the other contact, a restriction hole is formed in the part of the circuit board surrounded by a rubber cap. Then, on the board surface opposite to the contact side,
It is characterized in that a diffusion chamber is formed surrounding the aperture hole and is provided with another aperture hole that communicates with the outside air.

(Function) When the rubber cap is suppressed, it contacts the conductor or the other contact, and at the same time, the air in the rubber cap cavity passes through the aperture hole in the board, the diffusion chamber on the opposite side of the board, and the aperture hole. It is exhausted and generates operation noise.

〔Example〕

1-2 show a rubber contact switch according to an embodiment of the present invention.

In these figures, 10 shows the conductor 1 leaving a cavity 16.
A knob 11 is attached to one side of the rubber cap that protrudes from the perforation 1a of the upper case 1 while abutting against the flange portion 12 or the back surface thereof.

Reference numeral 3 designates semi-ring-shaped contacts 4.4a or printed circuit boards arranged as printed foils, and the insides of these contacts are perforated as aperture holes 5.

The lower case 7 accommodates the pudding 1 to the substrate 3 that are tightly attached to the upper case 1 and the rubber cap 10, and forms a disk-shaped diffusion chamber 8a with a diameter larger than the diameter of the aperture hole 5 in the center part. An inner wall 8 is formed in a ring shape and has the same height as the peripheral wall 7a, and an aperture hole 8b is bored at the center of the case surface forming the bottom surface of the diffusion chamber 8a.

The upper and lower cases 1 and 7 are assembled as shown in FIG. 2A by sandwiching the printed circuit board 3, which is tightly attached to the rubber cap 1O, in grooves formed on the periphery of each case and bonding them to each other. The bottom surface 15 of the rubber cap 10 is pressed onto the printed circuit board 3, the knob 11 protrudes from the perforation 1a, and a cavity 16 is formed around and below the conductor 13.

When the knob 1 is pressed, the skirt 14 of the rubber cap 10 bends and the conductor 1 is bent, as shown in FIG. 2B.
3 or contact 4.4a and tighten between them. At this time, the air in the cavity 16 is exhausted via the throttle hole 5, the diffusion chamber 8a, and the throttle hole 8b, generating an operation sound.

The height or tone is determined by the aperture hole 5.8b and the diffusion chamber 8.
It can be adjusted depending on the shape of a.

Such a rubber contact switch may be constructed singly or in several pieces.

FIG. 3 shows another embodiment of the present invention, in which the upper surface of a rubber cap 20 is formed as a knob, and a conductor 21 is attached inside the rubber cap 20, leaving a cavity 22 around and below. There is. Contacts 26.26a of printed circuit board 25
A diaphragm hole 27 is formed in the center of the corresponding substrate 2.
A cap 30 forming a diffusion chamber 31 shown in FIG. 4 is adhered to the back side of the cap 5, and a diaphragm hole 32 is formed in the center of the cap 30. A large number of rubber contact switches configured in this manner are arranged as a rubber contact switch device, as shown in FIG. 6, using a wide substrate 25 in common.

When one of the rubber caps 20 is pressed, the conductor 21 or the contact 26.26a is flanged, and the air inside is similarly exhausted through the throttle hole 27, the diffusion chamber 31, and the throttle hole 32, producing an operation sound. At this time, it is easily possible to change the diffusion chamber and the aperture hole so that the respective operation sounds can be distinguished.

〔Effect of the invention〕

As described above, according to the present invention, since the diffusion portion is formed behind the substrate, its size is not limited, and the degree of freedom in adjusting the operation sound can be increased. Therefore, when a large number of them are arranged, it becomes possible to give each one a unique sound and identify them. Furthermore, even if the rubber cap is used to cover the case, the sound will not be attenuated.

[Brief explanation of drawings]

FIG. 1 shows a rubber contact 1 according to a first embodiment of the present invention.
~An exploded perspective view of the switch; FIG. 2A is a cross-sectional view of the switch in its normal state; FIG. 2B is a cross-sectional view of the switch during operation; FIG. A cross-sectional view, Figure 4 is a perspective view of the diffusion chamber of the same switch, and Figure 5 is a perspective view of the diffusion chamber of the same switch.
The figure is a sectional view of the same switch when it is operated, and FIG. 6 is a perspective view showing a rubber contact switch device configured by arranging a large number of the same switches. 3.25...Princess J-board, 4.4a, 26.26a...Contact, 5.8b, 27.32...Aperture hole 8a, 31...Diffusion chamber, l0120...Rubber cap , 13.21...Electric conductor.

Claims (1)

[Claims] A rubber cap housing a conductor leaving a cavity is brought into close contact with a substrate on which a mating contact is arranged, and when the rubber cap is pressed to bring the conductor into contact with the mating contact, the air in the cavity is released. In rubber contact switches that generate operating noise due to exhaust air, a restriction hole is formed in the part of the circuit board surrounded by the rubber cap, and a separate hole is formed on the surface of the circuit board opposite to the contact side to communicate with the outside air. A rubber contact switch characterized in that a diffusion chamber having a throttle hole is formed to surround the throttle hole.