Switch for sensing proximity of an operator

Details Switch for sensing proximity of an operator Switch for sensing proximity of an operator

1980-11-17

1982-12-07

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular system function

340686, 340706, 340713, 340784, G02F 113

Patent

active

043630294

ABSTRACT:
A proximity switch in which the electronic characteristics of a liquid crystal display are monitored relative to a reference liquid crystal display to determine when an operator has come into proximity thereto. A controller monitors the display elements, liquid crystal displays, respective capacitances or inductance and when an operator comes into proximity to an electrode in the display element, the controller senses this proximity due to the change in capacitance or inductance of the element. This sensing allows the controller to recognize when a change of state is desired by the operator. The use of the reference element allows the controller to respond only to operator proximity and not to noise caused by changes in the environment, such as temperature.

REFERENCES:
patent: 3716289 (1973-02-01), Creagh et al.
patent: 3765747 (1973-10-01), Pankratz et al.
patent: 3771855 (1973-11-01), Burns
patent: 4224615 (1980-09-01), Penz

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