Focus detection method and focus detection device

Details Focus detection method and focus detection device Focus detection method and focus detection device

2007-06-04

2010-02-02

Perkey, W. B. (Department: 2862)

Photography

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

Plural focusing or rangefinding areas

C396S133000

Reexamination Certificate

active

07657169

ABSTRACT:
A focus detection method includes moving a focusing lens group from the near extremity toward the far extremity in a search operation, and stopping the focusing lens group upon first detecting an in-focus state to determine an in-focus position of the focusing lens group when detecting a focus state in each of a plurality of focus detection areas while performing the search operation, and moving the focusing lens group firstly to one of the near extremity and the far extremity which is closer to a current position of the focusing lens group and subsequently toward the other thereof, and stopping the focusing lens group upon first detecting an in-focus state to determine an in-focus position of the focusing lens group when detecting a focus state in the single focus detection area while performing the search operation.

REFERENCES:
patent: 2001/0010556 (2001-08-01), Sugimoto et al.
patent: 2005/0280734 (2005-12-01), Nakahara
patent: 2006/0078323 (2006-04-01), Nakahara
patent: 2002072074 (2002-03-01), None
patent: 2002311325 (2002-10-01), None
English language Abstract of JP 2002-072074.
English language Abstract of JP 2002-311325.
U.S. Appl. No. 11/754,506 to Nakahara , filed May 29, 2007.
U.S. Appl. No. 11/757,419 to Nakahara , filed Jun. 4, 2007.

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