Capacitive keyboard structure

Details Capacitive keyboard structure Capacitive keyboard structure

1983-01-12

1986-09-30

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

200 5A, 340365R, G06F 302

Patent

active

046149376

ABSTRACT:
A capacitive keyboard structure, the keyboard comprising on one face of a substrate a series of static sensitive keys each associated with a pair of electrodes: an emitting electrode excited sequentially by an alternating signal supplied by an emitting line and a receiving electrode which is coupled capacitively to the emitting electrode by the corresponding key and on which a receiving line collects the variations of the signal as an effect of possible presence of a user's finger in the neighborhood of the key, wherein the electrodes of one same type are disposed on such face, the electrodes of the other type being disposed on the other face of the substrate, thus avoiding the crossing of the emitting and receiving lines.
Application to the control of an industrial or publicly available apparatus.

REFERENCES:
patent: 4055735 (1977-10-01), Eachus
patent: 4125783 (1978-11-01), Sefton
patent: 4194083 (1980-03-01), Abe
patent: 4233522 (1980-11-01), Grummer
patent: 4288786 (1981-09-01), Ledniczki
patent: 4359720 (1982-11-01), Chai
patent: 4543564 (1985-09-01), Audoin

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