Capacitive key for electronic circuit

Details Capacitive key for electronic circuit Capacitive key for electronic circuit

1974-04-08

1976-04-20

Bagwill, Robert E.

Textiles: fiber preparation

179 90K, 200159R, 235145R, 340365C, B41J 512, H01H 312

Patent

active

039512509

ABSTRACT:
In a keyboard for an electronic circuit having a striker on each key formed of electronic material which is conductive or carries a conductor and which is moved downwardly towards a fixed conductor assembly to provide capacitive coupling, it is found that electrostatic charges can be generated by operation of a key which give spurious outputs. The present invention provides constructions for reducing the effects of such charges.

REFERENCES:
patent: 3659163 (1972-04-01), Borisov et al.
patent: 3670129 (1972-06-01), Cherry et al.
patent: 3696908 (1972-10-01), Gluck et al.
patent: 3735068 (1973-05-01), Yanaga et al.
patent: 3797630 (1974-03-01), Zilkha
Handbook of Chemistry and Physics, p. E-60, Properties of Dielectrics, 55th Edition, 1974.
A. S, Farber et al., "Detecting Key Depression", IBM Technical Disclosure Bulletin, Vol. 12, No. 11, Apr. 1970, pp. 1876-1877.
R. Abbatecola et al., "Threshold Capacitive Key", IBM Technical Disclosure Bulletin, Vol. 13, No. 11, Apr. 1971, pp. 3301-3302.

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