Touch actuated electronic switch

Details Touch actuated electronic switch Touch actuated electronic switch

1974-08-26

1977-01-11

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

200DIG1, H01H 3500

Patent

active

040029239

ABSTRACT:
An electronic switch which has no moving parts and is actuated by the capacitance of an operator providing a connection between earth ground and an input to the electronics associated with the switch is disclosed. The electronic switch in the preferred embodiment, includes a plate accessible to the tough of a human operator electrically connected to a first amplifier, and particularly to the input which is isolated from and thus oscillating with respect to earth ground. The output of the first amplifier is simultaneously connected to one end of a storage capacitor, having its other end connected to earth ground, and to one end of a high impedance. A second amplifier, is connected to the other end of the high impedance to provide a switched output, with the switched output having a first state for approximating an electrical short circuit and a second state for approximating an electrical open circuit.

REFERENCES:
patent: 2896131 (1959-07-01), Schumann
patent: 3275897 (1966-09-01), Atkins
patent: 3281541 (1966-10-01), Learner
patent: 3320438 (1967-05-01), Myers
patent: 3492440 (1970-01-01), Cerbone et al.
patent: 3869671 (1975-03-01), Schroder
Williams, IBM Tech. Disc. Bull. June 1974, vol. 17 No. 1, pp. 166-167.

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