Capacitive keyboard for data processing equipments

Details Capacitive keyboard for data processing equipments Capacitive keyboard for data processing equipments

1978-06-06

1980-11-18

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

200DIG1, 340365C, G06F 3023, G08C 902

Patent

active

042348714

ABSTRACT:
In a capacitive keyboard using a polarized dielectric commonly called an electret, the keys are organized according to a matrix by rows and columns, the signals generated on the column conductors being of opposite polarity with respect to those generated on the row conductors. The movable armatures of the variable capacitors of the keys also act as bridging elements to allow the crossing of the row and column conductors and as snap elements.

REFERENCES:
patent: 3653038 (1972-03-01), Webb
patent: 3751612 (1973-08-01), Hansen
patent: 3797630 (1974-03-01), Zilkha
patent: 3900712 (1975-08-01), Fukao
patent: 3951250 (1976-04-01), Pointon
patent: 3965399 (1976-06-01), Walker
patent: 3968488 (1976-07-01), Bovio
patent: 3982236 (1976-09-01), Kafafian
patent: 4127758 (1978-11-01), Lowthrop

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