Proximity switch

Details Proximity switch Proximity switch

1981-05-27

1983-04-12

Robinson, Thomas A.

Communications: electrical

Audible indication

Percussion-type sound producer

200DIG1, G08C 902

Patent

active

043800076

ABSTRACT:
The proximity switch has a capacitive sensor which comprises a metallic support mounted on a printed circuit board and supporting, on a surface parallel to said board but facing away from it, a layer made of electrically conductive foam material. The latter nestles against a cover plate made of glass which provides the dielectric of a capacitive sensor actuatable by the stray field of the mains. When this alternating stray field is concentrated by a part of a human body brought into the vicinity of the sensor, the latter will actuate an electronic switch connected to it.

REFERENCES:
patent: 3668698 (1972-06-01), Demirdjioghlou et al.
patent: 4027569 (1977-06-01), Luce et al.
patent: 4132487 (1979-01-01), Fisher
patent: 4293734 (1981-10-01), Pepper, Jr.

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