Ambient light sensor touch switch system and method

Details Ambient light sensor touch switch system and method Ambient light sensor touch switch system and method

1980-06-04

1982-05-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 250578, H01J 4014

Patent

active

043295819

ABSTRACT:
An ambient light responsive touch switch system for producing a signal whenever ambient light impinging on a photoelectric detector at a switch location is altered relative to the ambient light sensed by a photoelectric detector at a non-switch location. The system includes means for comparing the intensity of light between the photoelectric detector at a switch location relative to the intensity of ambient light at a non-switch location and a logic system that will produce a signal when the intensity of ambient light at the switch location is altered relative to the ambient light at the non-switch location.

REFERENCES:
patent: 3056030 (1962-09-01), Kelchner
patent: 3372789 (1968-03-01), Thiele et al.
patent: 3373287 (1968-03-01), Holzer
patent: 3526775 (1970-09-01), Friedrich et al.
patent: 3819906 (1974-06-01), Gould, Jr.
patent: 3885408 (1975-05-01), Clark, Jr.
patent: 3937952 (1976-02-01), Ripley et al.
patent: 4049964 (1977-09-01), Wuchinich et al.

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