Photoelectric conversion circuit having a tuning circuit and cha

Details Photoelectric conversion circuit having a tuning circuit and cha Photoelectric conversion circuit having a tuning circuit and cha

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:
patent: 4048578 (1977-09-01), Kimura
patent: 4535301 (1985-08-01), Takayama
patent: 4701048 (1987-10-01), Tokuda et al.
patent: 4793000 (1988-12-01), Imano et al.
patent: 4947033 (1990-08-01), Kordts et al.
patent: 5008695 (1991-04-01), Nagaoka et al.
patent: 5043564 (1991-08-01), Ikuta
patent: 5087119 (1992-02-01), Kaneko et al.
patent: 5148011 (1992-09-01), Taka

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