Capacity responsive keyboard

Details Capacity responsive keyboard Capacity responsive keyboard

1990-02-15

1992-02-11

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Repetitive make and break

307116, 307132R, 200511, 361280, H01H 4700, H01H 3500

Patent

active

050878255

ABSTRACT:
A capacity responsive keyboard which eliminates the necessity for metal films on the touch surface includes an insulated substrate having a plurality of electrically conductive plate members mounted thereon and a dielectric member positioned over the plate members. A piece of compressible, electrically-conductive foam is compressed between each plate member and the dielectric member to eliminate air from the electrical path between the dielectric member and the plate members. A grid of conductor segments separates the plate members defining a guard band to reduce interference between the switches. The guard band is connected with one power supply line of a switching circuit which produces outputs in response to capacity changes caused by a user touching the dielectric member.

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