Automatic focus adjustment camera

Details Automatic focus adjustment camera Automatic focus adjustment camera

1989-11-01

1991-03-05

Hix, L. T.

354474, 35419511, G03B 1300

Patent

active

049981269

ABSTRACT:
An automatic focus adjustment camera in which a photo-taking lens is step-driven to one of a plurality of set positions, depending upon measurement of object distance, employs aperture adjustment or adjustment of object distance to improve resolution of images. The total focusing distance range of the photo-taking lens is divided into successive object distance ranges, and the center of each object distance range corresponds to one of the set positions of the photo-taking lens. The amount of adjustment to improve resolution is determined by the extent to which the measured object distance differs from the center of the object distance range that includes the measured object distance. In a portrait photography mode the aperture diameter is made large enough to ensure blurring of background while obtaining a sharp object image.

REFERENCES:
patent: 4652104 (1987-03-01), Harvey
patent: 4678299 (1987-07-01), Harvey
patent: 4678300 (1987-07-01), Beach
patent: 4827303 (1989-05-01), Tsuboi

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