Photoelectric current converting circuit

Details Photoelectric current converting circuit Photoelectric current converting circuit

1994-04-28

1996-12-10

Perkey, W. B.

Photography

With object illumination for exposure

Having artificial illumination termination control

327101, G03B 1505, H03K 500

Patent

active

055836054

ABSTRACT:
A light adjusting circuit for a flash lamp of a camera includes a current converting circuit for converting the current output from a photodetector into a voltage modulated signal suitable for a counter circuit. The current converting circuit uses a capacitor to convert the current output by the photodiode into a voltage. The capacitor voltage is compared to a base or reference voltage. The output of the comparator is used to mask a clock signal output from a high frequency oscillator. When the clock signal is unmasked, the pulse output from the current converting circuit is counted by the counter circuit to turn the flash lamp on and off. The output from the comparator is also used to controllably discharge the capacitor when the capacitor voltage exceeds the reference voltage.

REFERENCES:
patent: 3419784 (1968-12-01), Winn
patent: 3846806 (1974-11-01), Yata et al.
patent: 4023188 (1977-05-01), Ueda et al.
patent: 4035814 (1977-07-01), Nobusawa
patent: 4249109 (1981-02-01), Ogawa
patent: 4297011 (1981-10-01), Adams, Jr.
patent: 4410812 (1983-10-01), Honig et al.
patent: 4695742 (1987-09-01), Randall

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