Keyboard switch covering pads

Details Keyboard switch covering pads Keyboard switch covering pads

1979-11-21

1981-09-15

Thibodeau, Paul J.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

428138, 428189, 428343, 428492, 428901, H01H 926, B32B 310

Patent

active

042899400

ABSTRACT:
A novel keyboard switch covering pad suitable for use in, for example, a pocketable electronic calculator is proposed which is safe from the danger of failure or erroneous operation of the LSI or other electronic devices built in the instrument when two or more of the key switches are pushed simultaneously.
The keyboard switch covering pad of the invention comprises an electrically conductive rubber sheet divided into a desired number of sections and an electrically insulating sheet which serves as a common lining for the divided sections of the rubber sheet, on which the divided sections are bonded keeping an electrically insulating air gap space between each other.

REFERENCES:
patent: 3860771 (1975-01-01), Lynn
patent: 4042439 (1977-08-01), Pounds
patent: 4090045 (1978-05-01), Marsh
patent: 4163138 (1979-07-01), Harden

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