Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-09-12
1991-11-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502081, H01J 4014
Patent
active
050685260
ABSTRACT:
A photoelectric conversion device comprises a first voltage source for providing a first predetermined voltage, a photoconductive cell having a first end connected to the first voltage source and a second end, the photoconductive cell being provided so as to receive an optical radiation and having a resistance that is changed in response to the optical radiation supplied to the photoconductive cell, a load resistance having a first end connected to the second end of the photoconductive cell and a second end, a second voltage source connected to the second end of the load resistance for providing thereto a second predetermined voltage that is different from the first predetermined voltage, and threshold detection circuit having an input terminal connected to the second end of the photoconductive cell, wherein the threshold detection circuit has a threshold level and produces a first output signal having a first level when an input signal supplied to the input terminal has a level below the threshold level while producing a second output signal having a second level when the input signal has a level above the threshold level.
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Messinger Michael
Nelms David C.
Ricoh & Company, Ltd.
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