Photoelectric conversion circuit

Details Photoelectric conversion circuit Photoelectric conversion circuit

1977-06-24

1978-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 250206, 354 60R, H01J 3912

Patent

active

041004078

ABSTRACT:
A novel form of photoelectric conversion circuit including a photo sensor is provided, which is very limited in response time even at low illuminations and highly valuable for use in automatic cameras. It comprises a comparator for comparing the output voltage of the operational amplifier, connected to the photo sensor, with a reference voltage, and discharging means operable under the control of the comparator quickly to discharge the charge stored in a parastic capacitor of the photo sensor when the circuit is energized for operation.

REFERENCES:
patent: 3843880 (1974-10-01), Tsuchigasu
patent: 3873827 (1975-03-01), Krause
patent: 3895230 (1975-07-01), Itagaki

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