Light measuring device for camera

Details Light measuring device for camera Light measuring device for camera

1988-10-13

1990-12-11

Perkey, W. B.

354432, 354478, G03B 708, G03B 7099

Patent

active

049774247

ABSTRACT:
A light measuring device for an exposure measurement at open aperture, lens-interchangeable photographic camera of a type capable of measuring the brightness of a target object to be photographed through a photo-taking lens assembly for the determination of an exposure amount, which device comprises a reading circuit for reading, from an interchangeable lens assembly, data associated with an exit pupil of the interchangeable lens assembly and data associated with the full aperture value of the interchangeable lens assembly, and a correcting circuit for calculating a correction value for a measured light value on the basis of the data read out by the reading circuit, for the purpose of exposure correction.

REFERENCES:
patent: Re32376 (1987-03-01), Fukuhara et al.
patent: 3498198 (1970-03-01), Fujii
patent: 3683765 (1972-08-01), Iura
patent: 4387975 (1983-06-01), Araki
patent: 4391488 (1983-07-01), Ishizaka et al.
patent: 4552446 (1985-12-01), Suda et al.
patent: 4636054 (1987-01-01), Saegusa
patent: 4682871 (1987-07-01), Metabi
patent: 4816663 (1989-03-01), Utagawa et al.
patent: 4833498 (1989-05-01), Kato et al.

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