Patent
1985-07-10
1987-05-26
Griffin, Donald A.
G03B 1914
Patent
active
046680659
ABSTRACT:
A camera comprises a mirror member provided between a photo-taking lens and the focal plane thereof and having a reflecting surface and a pivot axis provided at one end of the reflecting surface in parallelism to the focal plane, the mirror member being movable from an observation position in which the reflecting surface intersects the optic axis of the photo-taking lens to a retracted position in which the reflecting surface is retracted from the optic axis, by the pivotal movement of the reflecting surface about the pivot axis, a mirror chamber for containing the mirror therein, the mirror chamber having a pair of openings forming the optical path from the photo-taking lens to the focal plane a pair of vertical side walls provided on opposite sides of and vertically to the pivot axis and a movable bottom wall in parallelism to the pivot axis, and driving means for moving the mirror member and the movable bottom wall at the same time so that the center of gravity of the movable bottom wall moves in a direction substantially opposite to the direction of the movement of the center of gravity of the mirror member.
REFERENCES:
patent: 3675557 (1972-07-01), Yokozato et al.
patent: 3860941 (1975-01-01), Fukuda
patent: 4068246 (1978-01-01), Arai
patent: 4458998 (1984-07-01), Tanaka et al.
patent: 4508439 (1985-04-01), Ohara et al.
Tanabe Yoshiaki
Tanaka Etsuo
Griffin Donald A.
Nippon Kogaku K. K.
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