Patent
1991-08-16
1993-05-18
Perkey, W. B.
354479, G03B 1336, G03B 1912
Patent
active
052125149
ABSTRACT:
A camera includes a swing-up type instant-return mirror composed of a half mirror and a reflecting member located directly before a photographic plane when the instant-return mirror is placed on the optical path of a photographic lens and removed from the optical path when the instant-return mirror is removed from the optical path, in which when the instant-return mirror is placed on the optical path of the photographic lens, part of beams of light from the photographic lens is reflected from the instant-return mirror and incident on a finder optical system and the remainder is transmitted through the instant-return mirror, reflected in turn from the reflecting member and the instant-return mirror, and incident on a focus detecting optical system. Thus, the camera has practically important advantages of being provided with a focus detecting apparatus in which focusing can be made at any position of the focus detector assemblies extending in the directions of the major and minor sides of the picture plane to be photographed and at the same time, of being compactly designed.
REFERENCES:
patent: 3601027 (1967-08-01), Ono
patent: 3860935 (1975-01-01), Stauffer
patent: 4941010 (1990-07-01), Aihara et al.
patent: 4978988 (1990-12-01), Karasaki
Olympus Optical Co,. Ltd.
Perkey W. B.
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