JPS5931520A - Keyboard switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to a key gate switch as an input means for electronic equipment.

(2) Prior art The structure of a keyboard switch in a conventional electronic device such as an electronic desktop calculator is to place a key cover with a chevron-shaped cross section made of an elastic material such as silicone rubber on the key turn of a printed circuit board. A key cover with a movable contact that comes into contact with the key pattern is installed in the inner recessed part, and a key button is installed on the top of the key cover with the key top part partially protruding from the keyboard frame. Due to this structural pressure, when the key top part of the key button is pressed, the key cover deforms, the movable contact contacts the key pattern on the printed circuit board, and a predetermined key human input signal is output. It is something that

However, in the above-mentioned conventional keyboard switches, the key buttons are individually installed for each key pattern, which has the disadvantage of requiring a large number of parts and a large number of assembly man-hours.

Furthermore, when the keypad is installed through the frame of the keyboard, if the external shape of the keypad is symmetrical, there is a problem in that it is easy to erroneously install the keypad in the wrong direction.

(3) Purpose of the Invention The present invention has been made in view of the above-mentioned problems of the conventional key switch. It is an object of the present invention to provide a keyboard switch which reduces the number of parts and the number of assembly steps, and eliminates the inconvenience of installing a keypad in the wrong direction.

(4) Description of Embodiments Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of a keyboard switch according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the keyboard switch, and FIG. 3 is a side sectional view.

1 is the frame of the keyboard, and 2 is the key block.

As shown in FIG. 2, the key block 2 has a disk shape with four key buttons 2a (fdK) arranged symmetrically perpendicular to each other on the upper surface and a hemispherical protrusion 2b integrally formed in the center. Key button 2 of key block 2 on frame 1
A keyhole 3 from which the keep tongue 2a partially protrudes is provided at a position corresponding to a, and a protrusion receiver 1 into which a protrusion 2b is rotatably fitted is provided at the center of the inner surface as shown in FIG.
a is formed.

Reference numeral 4 denotes an elastic member made of silicone rubber or the like having a chevron-shaped protrusion 4a having a cross-sectional shape as shown in FIG.

A conductive contact 4b is provided in the recess on the back side of the protruding body 4a of the elastic member 4. 85 is a conductive contact 4 of the protruding body 4a.
This is a printed circuit board on which a key turn 5a which is electrically closed by contacting a conductive contact 4b at a position opposite to the key turn 5a is disposed. This printed circuit board 5 is fixed to the lower part of the frame 1 with screws 6 and the like as shown in FIGS. 2 and 3. Furthermore, a conductive contact 4b is provided at the end of the printed circuit board 5.
A plurality of output bins 5b are provided to be connected to the key pattern 5a in order to send a key input signal outputted by contact between the key pattern 5a and the key pattern 5a to the main body of the electronic device.

As shown in FIG. 3, the keyboard switch according to this embodiment has the key button 2a of the key block 2 protruding from the key hole 3 of the frame l described above, and a protruding body at the bottom of the key block 2. The elastic member 4 is arranged so that the upper end of the key button 43 comes into contact with the lower surface of the key button 2a, and the key turn 5a is inserted into the protrusion 4a from below the elastic member 4.
A printed circuit board 5 is fixed to the lower part of the frame 1 so as to face the printed circuit board 5. In this state, the key block 2 is supported from below by the protrusion 4a with a certain elasticity, and the protrusion 2b on the upper surface is connected to the protrusion receiver on the inner surface of the frame 1.
It is rotatably supported at a. Therefore, keep tan 2
When a is pushed in the direction of the arrow in FIG. 3, the key block 2 rotates around the protrusion 2b and presses the protrusion 4a. As a result, the protrusion 4a deforms downward and the conductive contact 4b connects to the printed circuit board 5.
The upper key F-turn 5a is contacted and a predetermined key human power signal is output.

Moreover, when the suppression of the keep tongue 2a is released, the protruding body 4a
Due to the elastic restoring force, the key 1'' button 2a is pushed upward and the key block 2 returns to its original state, and at the same time, the contact between the conductive contact 4b and the key pattern 5a is also released, and the output of the key human power signal is turned off.

In the above embodiment, when the keep tongue 2a is pushed up by the restoring force of the protruding body 4a, the key block 2
The condition of the key block 2 is stabilized by abutting against a stone (4-11) formed inside the collar frame 1 formed on the periphery of the key block. Further, the periphery of the elastic member 40 is abutted between the upright portion 1c provided within the frame 1 and the printed circuit board 5, and is fixed within the frame 1.

Further, in the above description, the case where four key buttons 2a are arranged on the key block 2 has been shown, but the number of key buttons 2a is not limited as long as it is two or more.

(5) Effects of the Invention As mentioned above (according to the present invention, a switch is constructed by integrally forming a plurality of key buttons), the number of parts and the number of assembly steps can be effectively reduced. To provide a keyboard switch that can eliminate the problem of installing a key button in the wrong direction during assembly.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a keyboard switch according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the key date switch, and FIG. 3 is a side sectional view of the key date switch. Here, 1...frame, 2...key block, 2
a...Keep tongue, 2b...Protrusion, 3...Keyhole, 4...Elastic member, 4a...Protrusion, 4b...
- Conductive contact, 5... Printed circuit board, 5a... Key pattern, 5b... Output bin. Patent applicant Canon Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In a keyboard switch whose contacts are opened and closed by pressing a key button, at least two or more key buttons are integrally formed into a key block, and the key block is supported within the frame of the keyboard so that each of the key buttons can move up and down. A keyboard switch characterized by: