1989-07-19
1990-11-20
Brown, Brian W.
G03B 1308
Patent
active
049722166
ABSTRACT:
A camera having a real-image viewfinder incorporating an optical finder system having the functions of an optical system for automatical focusing or an optical system for automatic exposure. The optical finder system comprises an objective lens having a positive power, an eyepiece, and an optical system such as porro mirror, disposed between the objective lens and the eyepiece and comprising a plurality of mirrors and/or a prism. Some of the mirrors a semitransparent mirrors capable of dividing the incident light for two optical paths. One part of the incident light is transmitted to the eyepiece and the other part of the incident light is transmitted to light receiving elements, which are disposed in substantially conjugate planes with respect to the focal plane of the objective lens, respectively for distance measurement and light measurement.
REFERENCES:
patent: 3842424 (1974-10-01), Tsunekawa et al.
patent: 4639111 (1987-01-01), Harvey
patent: 4728978 (1988-03-01), Inoue et al.
patent: 4743932 (1988-05-01), Matsui
Modern Photography, Apr. 1989, pp. 50-57.
Modern Photography, May 1986, pp. 44-54.
Hata Yoshiaki
Hoda Takeo
Inoue Manabu
Kudo Yoshinobu
Taniguchi Nobuyuki
Brown Brian W.
Minolta Camera Kabushiki Kaisha
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