Capacitance type contact switch

Details Capacitance type contact switch Capacitance type contact switch

1979-06-05

1981-10-06

Scott, James R.

Electricity: circuit makers and breakers

Special application

200DIG1, 200293, 361288, 340365C, H01H 3500

Patent

active

042937450

ABSTRACT:
A capacitance type contact switch has a conductive push button in the form of a bottomed cylinder which is slidably contained in first and second fitting members attached to a support plate. One end of a conductive spring member presses on the inside of a bottom portion of the push button to bias the push button toward the back of a front contact plate, while the other end of the spring member is in contact with a conductive seat member. An electrical circuit substrate contained in a switch case is connected to the seat member by means of a lead wire. Thus, electrical conduction may be provided between the contact plate and the electrical circuit substrate by means of the push button, spring member, seat member, and the lead wire. The switch is operated when a user touches the front contact plate to form a capacitance, the charging voltage of the capacitance being detected to control the switch in a manner known per se.

REFERENCES:
patent: 3653038 (1972-03-01), Webb et al.
patent: 4045629 (1977-08-01), Anzani
patent: 4149217 (1979-04-01), Tucker
Siemens, MSR/P 7707/19, Digital MOS Sensor-Dimmer with ICs 11/7/-7.

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