Automatic focus adjustment apparatus

Details Automatic focus adjustment apparatus Automatic focus adjustment apparatus

1997-10-03

1999-01-19

Perkey, W. B.

Photography

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

Having pursuit mode

G03B 1336

Patent

active

058624171

ABSTRACT:
An automatic focus adjustment apparatus more ideally accomplishes a tracking servo process, which drives a shooting lens so that a focusing state is maintained by predicting movements of an image plane of a moving object. A lens driving system 6 determines the moving speed of an image plane of an object or a movement prediction curve by regression-calculating from a plurality of defocus amounts previously calculated, a calculator, the accumulation time of a focusing state detector, and a lens position obtained from a lens movement amount detector, to drive a lens by assuming a future position of the image plane based on a result of the calculation.

REFERENCES:
patent: 5502537 (1996-03-01), Utagawa
patent: 5587762 (1996-12-01), Watanabe
Abstract of JP-A-63-31733, Feb. 1994, Japan.
Abstract of JP-A-1-288815, Nov. 1989, Japan.

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