Passive autofocus system for a camera

Details Passive autofocus system for a camera Passive autofocus system for a camera

2006-06-06

2006-06-06

Perkey, W. B. (Department: 2851)

Photography

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

Reliability of focus/distance signal

C396S125000, C348S345000

Reexamination Certificate

active

07058294

ABSTRACT:
An autofocus system for a camera includes a contrast focus detector which detects a position of a focusing lens group, at which the contrast of an object image reaches a maximum as a contrast in-focus position; a phase-difference focus detector which separates the object image light bundle into two light bundles which form two object images on a light-receiving element to detect a phase difference between the two object images formed thereon, the phase-difference focus detector defining a position of the focusing lens group at which an in-focus state is obtained for the object as a phase-difference in-focus position; and a controller for moving the focusing lens group via the lens driver to the phase-difference in-focus position or the contrast in-focus position. The controller adjusts a moving range of the focusing lens group in accordance with a degree of reliability of the phase-difference in-focus position.

REFERENCES:
patent: 5597999 (1997-01-01), Kinba et al.
patent: 6108495 (2000-08-01), Takahata et al.
patent: 6178295 (2001-01-01), Nakata et al.
patent: 6181378 (2001-01-01), Horie et al.
patent: 2003/0081137 (2003-05-01), Yamazaki
patent: 5-210042 (1993-08-01), None
patent: 7-43605 (1995-02-01), None
patent: 2001-141984 (2001-05-01), None
English Language Abstract of JP 2001-141984.
English Language Abstract of JP 5-210042.

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