Keyboard for under water use

Details Keyboard for under water use Keyboard for under water use

1992-06-23

1993-01-19

Burr, Edgar S.

Typewriting machines

Key-board or key lever-actuating mechanism

Including means generating a signal for type selecting or...

400719, B41J 516

Patent

active

051802376

ABSTRACT:
A keyboard housing includes a key plate with a plurality of actuator keys mounted on an upper face and a waterproof chamber mounted on a lower face thereof and a device to retain the actuator keys in a normally unpressed position. A circuit board is disposed in the waterproof chamber. A switch contact assembly mounted on the lower face of the key plate which includes a first membrane having a first conductive pattern, a second membrane having a second conductive pattern and a partition membrane disposed between the first and second membranes to separate the first conductive pattern from the second conductive pattern in a normal open switch. The partition membrane includes a hole device which permits a portion of the first conductive pattern to engage with a portion of the second conductive pattern when the first membrane is pressed by one of the actuator keys, thereby generating a signal corresponding to the pressing key. The periphery of the first membrane is adhesively connected to a face of the partition membrane, and the periphery of the second membrane is adhesively connected to the other face of the partition membrane. The conductive patterns of the first and second membranes are electrically connected to the circuit board.

REFERENCES:
patent: 3890480 (1975-06-01), Berling et al.
patent: 4322587 (1982-03-01), Burns et al.
patent: 4644326 (1987-02-01), Villalobos et al.
patent: 5089671 (1992-02-01), Ranetkins

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