Capacitive keyswitch membrane with self contained sense-to-groun

Details Capacitive keyswitch membrane with self contained sense-to-groun Capacitive keyswitch membrane with self contained sense-to-groun

1988-09-30

1990-04-24

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

200 5A, 200600, 4004791, 341 22, H03M 1100, H03M 1798

Patent

active

049203436

ABSTRACT:
A membrane capacitive keyboard of the type including a first flexible dielectric sheet and a second dielectric sheet having electrically conductive patterns thereon which form an array of capacitors and connecting matrices of drive and sense conductors. The patterns on the sheets include a first array of capacitor plates on an inner surface of the first sheet and a second array of capacitor plates on the outer surface of the second sheet. A third array of electrically floating capacitor plates is formed by a third pattern on the inner surface of the second sheet. The sense conductors are capacitively coupled to ground through coupling capacitor plates connected to the sense conductors and a common capacitor plate overlaying the coupling capacitor plates.

REFERENCES:
patent: 4616213 (1986-10-01), Danish
patent: 4728931 (1988-03-01), Linder et al.
patent: 4743895 (1988-05-01), Alexander

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