Focus detection device for a camera

Details Focus detection device for a camera Focus detection device for a camera

1995-10-06

1997-03-18

Adams, Russell E.

Photography

With exposure objective focusing means, focusing aid, or...

Optical detail with photoelement system

396121, G03B 1336

Patent

active

056127626

ABSTRACT:
A focus detection device for a camera capable of detecting focuses at a plurality of areas on a photographing field, comprises two pairs of photo-electric conversion device arrays arranged on one substrate in optical correspondence to two of said plurality of areas; the two areas being arranged on a line extending generally vertically to a horizontal center axis crossing an optical line on the photographing field, on the opposite sides of the center line; and a refocusing optical system for refocusing light beams passing through different points of an exit pupil of a photographing lens, onto the two pairs of photo-electric conversion device arrays; the refocusing optical system including a pair of refocusing lenses for focusing the light beams onto the two pairs of photo-electric conversion device arrays.

REFERENCES:
patent: 4768052 (1988-08-01), Hamada et al.
patent: 4954701 (1990-09-01), Suzuki et al.
patent: 4978988 (1990-12-01), Karasaki
patent: 4992819 (1991-02-01), Ohtaka et al.
patent: 5068217 (1992-02-01), Ishida et al.
patent: 5138359 (1992-08-01), Nagano et al.

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