Exposure measurement circuit

Details Exposure measurement circuit Exposure measurement circuit

1978-01-30

1980-02-26

Hix, L. T.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356226, G03B 1718, G01J 144

Patent

active

041903374

ABSTRACT:
The exposure metering circuit comprises a differential amplifier, whose inputs are connected to a measuring bridge consisting of a photo-conductive cell and setting controls for the insertion of exposure factors and whose outputs are connected to light-emitting elements for the indication of a set under-exposure, over-exposure or the correct exposure. The two measuring bridge feed points are connected across a resistor, on the one hand, and across a transistor which is driven by means of a voltage derived from the common emitter circuit of the differential amplifier, on the other hand, to an operating voltage source.

REFERENCES:
patent: 3028538 (1962-04-01), Rosenfeld et al.
patent: 3102981 (1963-09-01), Pulliam
patent: 3387206 (1968-06-01), Sampson
patent: 3452656 (1969-07-01), Ruhle
patent: 3594088 (1971-07-01), Akiyama
patent: 3596579 (1971-08-01), Coughlin
patent: 3753388 (1973-08-01), Toyoda et al.
patent: 3955081 (1976-05-01), Sato et al.
patent: 3979600 (1976-09-01), Bohning

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