JPS583230Y2 - Structure of keyboard switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a keyboard switch.

In the past, keyboard switches were often used in the input section of calculators, but in recent years, electronic desk-L calculators have become smaller, and they are often carried in the pockets of suits, shirts, etc. The number of occasions where they are used with zero explosives has increased, increasing the risk of them getting wet.

The present invention provides a waterproof keyboard switch to deal with the risk of getting wet.

The gist of the present invention to achieve the above object is to provide a keyboard switch that uses a conductive rubber sheet 1-1 or an insulating rubber sheet with a conductive member fixed to the electrical contact portion that is opened and closed by the pushbutton operation of a key. 1 to 1 are pressed against a case accommodating a circuit board provided with an input end of a keyboard switch, thereby serving as a waterproof rubber sheet for the circuit board.

The present invention will be explained below based on the drawings. Figure 1 is a sectional view showing one of the embodiments of the present invention, where 1, 2, and 3 are keys, 4 is a case top cover, and 5 is a case. The main body 6 is a circuit board, and the keys 1, 2 . and input terminals 6a, 6b, and 6C corresponding to the input terminals 6a, 6, and 3, respectively.
b, and 6C are the keys 1, 2 . and a common electrode end 6a to be connected by the bush operation of 3.

7 is a conductive rubber sheet 1, and by inserting the periphery of the rubber sheet 7 between the case-top lid 4 and the case body 5, the inside of the case is closed to the case-top lid side space 4.
a and a space 5a on the side of the game main body, and the keys 1, 2. It not only functions as a waterproof rubber so that water coming from the gap between the case top cover 4 and the space 5a does not enter the space 5a, but also presses the circuit board 6 against the case body 5. At the same time, an electrical connection is made to the common electrode end 6a of the circuit board 6-F, and the keys 1, 2 . and 3 are pressed, the input terminal 6
a, 6b and 6C are connected to the common electrode end 6a via the conductive rubber sheet 7.

8 is an insulating spacer inserted between the circuit board 6 and the conductive rubber sheet 7, and is inserted between the input ends 6a, 6b,
and 6C, and in a normal state, the input ends 6a, 6b, and 6C and the conductive rubber sheet 7
When the keys 1, 2, and 3 are pressed, the conductive rubber sheet 7 bends corresponding to the pressed keys, and the input ends 6a, 6b, and 6 are insulated.
It will be pressed against each of C independently.

In place of the conductive rubber sheet 7, the input end 5a.

It is also possible to use an insulating rubber sheet with conductive members fixed to the positions corresponding to 6b and 6C, and methods for fixing the conductive members include printing conductive paint, fixing a metal plate, conductive There are rubber insert molds, etc.

Further, the conductive rubber sheet 7 is connected to the keys 1, 2 . It also serves as a return spring for the bushing operation in step 3.

FIG. 2 is a sectional view showing a waterproof structure conventionally used for wristwatch buttons, etc., in which 9 is a watch case, 10 is a side pipe fixed to the watch case 9, and 11 is a side pipe 10 fixed to the watch case. The engaged bushing button 12 is a waterproof rubber ring, which performs a waterproofing role by being compressed and inserted between the groove of the bushing button and the side pipe.

13 is a snap ring for preventing the bush button 11 from being removed.

As described above, the present invention uses a rubber sheet for contacts that also serves as a waterproof rubber sheet, without increasing the number of parts.
Not only does it make it possible to make a keyboard switch with a large number of keys waterproof, but in the conventional waterproof structure of the button buttons shown in Figure 2, the waterproof rubber ring prevents the button from operating the button. In response to the return of
It can also serve as a return spring for key button operation on the waterproof rubber sheet.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing a waterproof structure conventionally used in wristwatch buttons and the like. 1.2.3...Key, 4...Case top cover, 5...Case body, 6...Circuit board, 7... Conductive rubber sheet, 8...
Insulating spacer, 9...Watch case, 10.
... Side pipe, 11 ... Button button, 12 ... Waterproof rubber ring, 13 ...
・Snap ring.

Claims (1)

[Scope of utility model registration request] In a keyboard comprising a case body housing a circuit board having an input end and a case top lid housing a key, a rubber sheet having at least electrical contact portions that is conductive is disposed, the outer shape of the rubber sheet being The shape is greatly influenced by the shape of the circuit board, and on the explosive side of the circuit board,
Said Gomshi! - By directly compressing and holding the periphery between the outer periphery of the case body, the outer periphery of the case top lid, and 0,
A structure of a keyboard switch, characterized in that it has both a waterproof function for the circuit board and a return spring function for the pushbutton operation of the key.