Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-12-26
1993-09-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214B, 250214RC, G01J 132
Patent
active
052488802
ABSTRACT:
A sensor circuit for detecting light hazards or bright light sources that will cause discomfort. The sensor and sensor electronics which provide a wide sensitivity range which is fully automatically adjustable, and which has the ability to detect point sources of light. The sensor further has the ability to distinguish low power stable light generated from a small welding arc from bright ambient light or even direct sunlight.
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Pending U.S. patent applications: Ser. No. 365,167, filed Jun. 12, 1989, John D. Fergason; High Speed, Low Power Driving Circuit for Liquid Crystal Shutter.
Ser. No. 653,661, filed Feb. 8, 1991, Fergason et al; Eye Protection Device for Welding Helmets and the Like.
Ser. No. 674,850, filed Mar. 25, 1991, Fergason et al; Liquid Crystal Lens Driver Electronics for Eye Protection & High Speed Shuttering.
Le Que T.
Nelms David C.
OSD Envizion Company
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