Automatic focus adjustment device and method

Details Automatic focus adjustment device and method Automatic focus adjustment device and method

1995-01-25

1997-02-04

Metjahic, Safet

Photography

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

Processing circuit

396 96, 396133, G03B 1336

Patent

active

056003986

ABSTRACT:
An automatic focus adjustment device and method is used after focussing a shooting lens so as to maintain both stability and focussing precision. Shooting lens defocus amounts are calculated based on focus state detection signals repeatedly output from an electric charge type photosensitive device that receives light rays from a subject. Focus adjustment is accomplished until the shooting lens is in the predetermined focussing state based on these defocus amounts. After the shooting lens has reached the predetermined focussing state, the calculated defocus amounts are statistically processed. The determination to resume focus adjustment of the shooting lens is made based on this processing.

REFERENCES:
patent: 4473286 (1984-09-01), Watanabe et al.
patent: 5003166 (1991-03-01), Girod
patent: 5410383 (1995-04-01), Kusaka et al.

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