Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-09-09
1982-07-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250229, G01D 534
Patent
active
043408133
ABSTRACT:
Switch panel in the form of a glass plate having markings printed thereon to form a switch space. The panel has an opaque layer on the back surface containing windows which are transparent to infrared radiation. A switch sensor responsive to infrared radiation is provided to receive any radiation that may pass through the window from an infrared radiation emitter where the radiation is reflected or dispersed when the switch space is touched.
REFERENCES:
patent: 3372789 (1968-03-01), Thiele et al.
Hostetter Darwin R.
Nelms David C.
Saint Gobain Vitrage
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