Light measuring circuit

Details Light measuring circuit Light measuring circuit

1981-05-12

1983-08-23

Arnold, Bruce Y.

Optics: measuring and testing

Photometers

Integrating

315241P, 354 33, G01J 146, H05B 4114

Patent

active

044000871

ABSTRACT:
A light measuring element which is provided with a pulse signal generator for generating pulse signals the duty ratio of which varies in accordance with a coefficient related to the exposure for photographing, a switching element which is driven by the output pulse signals from the pulse signal generator, and a light integrating circuit which includes a photo detector and an integrating capacitor and provides the voltage across the integrating capacitor as a light measure output. The light integrating circuit performs an intermittent light integrating operation by the action of the switching element. The integration period of the light integrating circuit is varied by varying the duty ratio of drive signals to the switching element which are supplied from a pulse signal generator, which duty ratio varies with a coefficient related to the proper exposure for photographing.

REFERENCES:
patent: Re28025 (1974-05-01), Murata et al.

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