Mirror device in a single lens reflex camera or the TTL metering

Details Mirror device in a single lens reflex camera or the TTL metering Mirror device in a single lens reflex camera or the TTL metering

1977-03-10

1978-10-24

Gonzales, John

354152, G03B 700

Patent

active

041224680

ABSTRACT:
In a single lens reflex camera of the TTL metering type comprising a mirror device having a central translucent area containing the optic axis of the picture-taking lens of the camera and a reflecting area surrounding the central translucent area, the mirror device being disposed in intersecting relationship with the optic axis, and a light receiving element disposed behind the mirror device to measure the quantity of light passed through the central area, the central area is so formed that the quantity of light passed through the central area to the light receiving element is varied substantially in proportion to the area of the exit pupil of the picture-taking lens has been stopped down.

REFERENCES:
patent: 3385190 (1968-05-01), Sho et al.
patent: 3446126 (1969-05-01), Leitz et al.
patent: 3540364 (1970-11-01), Ono
patent: 3643575 (1972-02-01), Ono
patent: 3779146 (1973-12-01), Trankner

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