Focus detection apparatus

Details Focus detection apparatus Focus detection apparatus

1993-12-21

1995-06-06

Perkey, W. B.

G03B 1336

Patent

active

054227011

ABSTRACT:
A focus detection apparatus for, e.g., a camera, can perform focus detection of even a position separated from an optical axis of an exchangeable photographing lens in a direction perpendicular to the optical axis regardless of an exit pupil position of the photographing lens. A detection image range used in focus detection is limited to a small region smaller than a detection image range of a conventional re-imaging type apparatus, and the way of setting use regions on an image sensor is changed in accordance with an exit pupil position of a photographing lens, and an aperture position of a re-imaging lens (a position separated from the optical axis in a direction perpendicular to the optical axis), i.e., a region changing means for changing the way of setting an image shift calculation region for comparing an image shift is provided, thereby allowing focus detection free from an eclipse.

REFERENCES:
patent: 4560863 (1985-12-01), Matsumura et al.
patent: 4855777 (1989-08-01), Suda et al.

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