Metering device for cameras

Details Metering device for cameras Metering device for cameras

1976-04-29

1977-08-30

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

250201, 250205, 356226, 354 24, 354 60E, G01J 142, G03B 708, G03B 700

Patent

active

040451429

ABSTRACT:
In a metering device for cameras comprising an operational amplifier, a photodiode connected between the positive and the negative input terminal of the operational amplifier, and a logarithmic conversion diode connected between the negative input terminal and the output terminal of the operational amplifier, the electric charge stored in the capacity present in the photodiode due to noise may be discharged to a capacitor which is adapted to reduce its potential in synchronism with the output potential drop of the operational amplifier.

REFERENCES:
patent: 3704950 (1972-12-01), Rosencrantz
patent: 3781119 (1973-12-01), Mori
patent: 3859519 (1975-01-01), Weischedel
patent: 3928860 (1975-12-01), Numata et al.
patent: 3977011 (1976-08-01), Matsuda

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