Contactless key switch

Details Contactless key switch Contactless key switch

1976-10-14

1978-04-18

Kozma, Thomas J.

Inductor devices

With deformable or distortable coil and/or core

331 65, 336136, H01F 2100

Patent

active

040853942

ABSTRACT:
A contactless key switch includes a manually operable actuating element mechanically coupled to a variable inductor fabricated from a resilient conductive material. The variable inductor biases the actuating element in an undepressed position, and depressing the actuating element compresses the variable inductor and changes its inductance. A detector circuit electrically coupled to the inductor senses the change in inductance and provides a signal indicating that the actuating element has been depressed.

REFERENCES:
patent: 1533749 (1925-04-01), Meirowsky
patent: 1836808 (1931-12-01), Marrison
patent: 2240849 (1941-05-01), Lubeke
patent: 2459493 (1949-01-01), Bradford et al.
patent: 2478925 (1949-08-01), Jones
patent: 2855571 (1958-10-01), Kleespies
patent: 3719902 (1973-03-01), Esterly
patent: 3987386 (1976-10-01), Valliere

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