Focus adjusting method and focus adjusting device

Details Focus adjusting method and focus adjusting device Focus adjusting method and focus adjusting device

2008-07-22

2010-11-09

Perkey, W. B. (Department: 2862)

Photography

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

Plural focusing or rangefinding areas

C396S116000, C348S349000

Reexamination Certificate

active

07831138

ABSTRACT:
A focus adjusting method for adjusting focus by moving a focusing lens group of a photographing optical system, wherein the focus adjusting method includes a first search stage at which a focus search operation is performed based on an image formed in a large focus area while the focusing lens group is moved stepwise over an entire range of movement thereof from the near extremity to the far extremity, and a second search stage at which the focus search operation is performed, based on images formed in small focus areas, at front and rear close vicinities of the in-focus position while the focusing lens group is moved stepwise over a portion of the entire range of movement thereof.

REFERENCES:
patent: 5249058 (1993-09-01), Murata et al.
patent: 2006/0238640 (2006-10-01), Hofer
patent: 2007/0215791 (2007-09-01), Yamamoto
patent: 2007/0280665 (2007-12-01), Nakahara
patent: 2007/0280666 (2007-12-01), Nakahara
patent: 2007/0285556 (2007-12-01), Nakahara
patent: 2008/0136958 (2008-06-01), Nakahara
patent: 2008/0143866 (2008-06-01), Nakahara
patent: 3-68280 (1991-03-01), None
patent: 2002311325 (2002-10-01), None
JP-2002311325 A Machine Translation.
English language Abstract of JP 3-68280, Mar. 25, 1991.

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