Mirror arrangement for use in a single lens reflex camera

Details Mirror arrangement for use in a single lens reflex camera Mirror arrangement for use in a single lens reflex camera

1982-09-22

1984-07-24

Perkey, William B.

354479, 354152, 350172, G03B 300, G03B 1912, G02B 2714

Patent

active

044615574

ABSTRACT:
A mirror arrangement for use in a single lens reflex camera which divides a light transmitted through an objective lens of the camera into a first portion led to a viewfinder and a second portion led to a light receptor which detects a focusing condition of the objective lens or the like, is disclosed. The mirror arrangement comprises a total reflection mirror surface and a plurality of light transmitting slits arranged thereon in parallel to each other. A width of each slit is limited less than 80.mu.. Pitches between two adjacent slits in the width direction are over than two times of an average width of all slits, and have at least two different values.

REFERENCES:
patent: 1253138 (1918-01-01), Brewster
patent: 2220862 (1940-11-01), Blodgett
patent: 3356523 (1967-12-01), Libbert
patent: 3521542 (1970-07-01), Goederen
patent: 3540364 (1970-11-01), Ono
patent: 4185191 (1980-01-01), Stauffer
patent: 4392729 (1983-07-01), Tsunefuji

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