Light measuring device for flash exposure system

Details Light measuring device for flash exposure system Light measuring device for flash exposure system

1988-08-17

1989-09-19

Adams, Russell E.

354425, 354426, G03B 708

Patent

active

048685941

ABSTRACT:
This invention relates to light measuring devices, and, more particularly, to light measure devices for a circuit receiving reflected light from an object being photographed with flash illumination. The invention is to obtain an alternating current component (the flash illumination) alone or a mixture of the alternating current component and a fraction of a direct current component (ambient light) as the output of the light measuring circuit only by arranging a feedback circuit having a prescribed gain for low frequencies in the feedback network of the light measuring circuit, the fraction being adjustable by varying the prescribed gain.

REFERENCES:
patent: 4045142 (1977-08-01), Watanabe
patent: 4076977 (1978-02-01), Tsunekawa et al.
patent: 4160160 (1979-07-01), Hasegawa et al.
patent: 4241280 (1980-12-01), Abbadessa et al.
patent: 4291979 (1981-09-01), Yuasa et al.
patent: 4300825 (1981-11-01), Kitawa et al.
patent: 4639134 (1987-01-01), Bletz

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