Auto focus adjustment system and auto focus adjustment method

Details Auto focus adjustment system and auto focus adjustment method Auto focus adjustment system and auto focus adjustment method

1995-06-12

1997-04-22

Perkey, W. B.

Photography

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

Lens characteristic compensating

396123, G03B 1336

Patent

active

056237073

ABSTRACT:
An auto focus adjustment system includes an arrangement device, a focus detection device, a defocus amount determination device, and a drive control device. The arrangement device arranges a plurality of focus detection regions in a photographic field of a photographic optical system. The focus detection device detects a defocus amount that represents a deviation amount between an image plane and a predetermined focus plane for each detection region. The defocus amount determination device determines a final defocus amount based on a plurality of defocus amounts detected by the defocus detection device. The defocus amount determination device selects defocus amounts greater than a specified negative defocus amount. From among these selected defocus amounts, the defocus amount determination device determines a least defocus amount as the final defocus amount. The drive control device then controls the driving of the photographic optical system based on the final defocus amount determined by the defocus amount determination device. As a result, the auto focus adjustment system permits a photographer to maintain an intended subject in focus even when an undesired subject crosses in front of and close to the camera.

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patent: 5479234 (1995-12-01), Kitaoka

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