Single lens reflex camera

Details Single lens reflex camera Single lens reflex camera

1984-09-28

1986-10-07

Perkey, William B.

354152, G03B 7099, G03B 1912

Patent

active

046156038

ABSTRACT:
In the single lens reflex camera whose movable mirror for reflecting light from the photographic lens to the finder is made partly half-mirrored to give a portion of the light to the photosensitive element, the finder is provided with a focusing screen of high diffusing property, the movable mirror having a half-mirrored portion at the center of the entire area with the surrounding area being made perfectly reflective is provided with a pattern of finely divided areas some of which are half-mirrored and the others of which are perfectly reflective in gradually varying area ratios in a boundary area between the central and surrounding areas, and a mask is provided on the back surface of the movable mirror for shutting off the passed light through the finely divided area pattern.

REFERENCES:
patent: 4302089 (1981-11-01), Fukuhara
patent: 4392729 (1983-07-01), Tsunefuji
patent: 4431285 (1984-02-01), Kajita et al.
patent: 4437740 (1984-03-01), Suzuki et al.
patent: 4461557 (1984-07-01), Kimura
patent: 4508439 (1985-04-01), Ohara et al.

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