Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-03-21
1978-10-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250229, 350351, G01D 534
Patent
active
041198450
ABSTRACT:
A switching system having a photo-sensitive power switching or control element such as a photo SCR, photo triac, photo transistor or the like that is normally turned on or off by coupled light from a controlled light source such as an LED (light emitting diode), neon lamp, incandescent lamp or the like. A thermally-sensitive light-gating element such as an LC (liquid crystal) element controls the light impinging on the photo-sensitive element. The gating element may sense the temperature of the photo-sensitive power switching or control element directly if the two are integral in which case the combined device would be self-protecting. On the other hand, the gating element may be separate and may be arranged to sense the temperature of an external source that may or may not be controlled by the photo-sensitive power switching or control element in which case the latter would be controlled by the temperature. Different types of temperature-sensitive gating elements or combinations thereof may be used in the systems.
REFERENCES:
patent: 2666583 (1954-01-01), Whitney
patent: 2792484 (1957-05-01), Gurewitsch et al.
patent: 3654474 (1972-04-01), Jacobs
patent: 3719789 (1973-03-01), Harnden
Jaskolski Stanley V.
Lade Robert W.
Schutten Herman P.
Autio William A.
Cutler-Hammer, Inc.
Nelms David C.
Rather Hugh R.
Taken Michael E.
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