Exposure meter circuit

Details Exposure meter circuit Exposure meter circuit

1975-09-03

1977-01-25

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

354 23R, G01J 144

Patent

active

040048535

ABSTRACT:
An exposure meter circuit is disclosed in which the photoreceptor may be either a photovoltaic element such as a photodiode or a photoconductive element such as a CdS element. The meter is able to provide an indication of various exposure determining factors such as object brightness, shutter speed, aperture, or a fixed point for alignment by appropriate choice of circuit values.

REFERENCES:
patent: 3723014 (1973-03-01), Nanba
patent: 3888594 (1975-06-01), Ichiyanagi

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