Patent
1995-04-26
1996-01-23
Gellner, Michael L.
35419511, 35419512, 354402, G03B 310, G03B 708
Patent
active
054868947
ABSTRACT:
A camera comprising an exposure control circuit for controlling the exposure in accordance with the output of a light measuring circuit receptive of light at a different position from that of a photographic lens system, a distance detecting circuit for automatically determining the object distance, the photographic lens system comprising lens groups on either side of a diaphragm whose axial position relative to an image plane is made constant, the front and rear lens groups being moved axially to effect zooming and the one of the lens groups which lies behind the diaphragm being moved axially to effect focusing, and an exposure correction control circuit for detecting the axial position of the rear lens group behind the diaphragm to correct the exposure value obtained from the light measuring circuit when the exposure is controlled.
REFERENCES:
patent: 4203661 (1980-05-01), Besenmatter
patent: 4285585 (1981-08-01), Numata
patent: 4451129 (1984-05-01), Ikari et al.
patent: 4708454 (1987-11-01), Kodaira et al.
patent: 4725864 (1988-02-01), Ogawa et al.
patent: 4899191 (1990-02-01), Maruyama
patent: 4908643 (1990-03-01), Tamada et al.
patent: 4910544 (1990-03-01), Nomura
patent: 4994842 (1991-02-01), Itoh et al.
Canon Kabushiki Kaisha
Gellner Michael L.
Nelson Eric
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