Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-02-18
1993-10-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502016, 250214SW, 250214A, H01J 4014, G01J 120, G03B 300
Patent
active
052528200
ABSTRACT:
A photoelectric conversion circuit which can detect only signal light from applied light, to avoid influence by disturbance light. An anode of a photodiode (1) is grounded and an input end of a tuning circuit (5) is connected to its cathode through an input terminal (3). An output end of the tuning circuit (5) is connected to an output terminal (4) through an amplifier (6). The output terminal (4) is grounded through a load resistor (7). The tuning circuit (5) is tuned with the frequency of signal light included in light (2) which is applied to the photodiode (1). A photoelectric conversion current caused by disturbance light is removed in the tuning circuit (5), so that only a photoelectric conversion current caused by signal light is detected. Switching devices are connected to the photodiode for providing current from the photodiode to the input terminals of the amplifier.
REFERENCES:
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patent: 4701048 (1987-10-01), Tokuda et al.
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patent: 5087119 (1992-02-01), Kaneko et al.
patent: 5148011 (1992-09-01), Taka
Messinger Michael
Mitsubishi Denki & Kabushiki Kaisha
Nelms David C.
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