Focus detecting apparatus for camera

Details Focus detecting apparatus for camera Focus detecting apparatus for camera

1989-12-28

1990-09-11

Adams, Russell E.

354408, G03B 1336

Patent

active

049566601

ABSTRACT:
A focus detecting apparatus for a camera, includes first and second light-receiving units, and a correlation detecting unit. The first and second light-receiving units receive first and second images formed by light bundle received from an object to be photographed through first and second portions of a photographing lens divided by a face including an optical axis thereof, and output image signals corresponding to light distribution patterns of the images, respectively. The correlation detecting unit detects portions having the highest correlation degree of the two images in accordance with the image signals. The focus detecting apparatus for a camera performs focus detection of the photographing lens on the basis of a detection result of the correlation detecting unit. The correlation detecting unit detects the portions having the highest correlation degree using at least two different methods.

REFERENCES:
patent: 4559446 (1985-12-01), Suzuki
patent: 4716434 (1987-12-01), Taniguchi et al.
patent: 4766302 (1988-08-01), Ishida et al.
patent: 4800410 (1989-01-01), Akaghi et al.

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