Auto focus unit and digital camera

Details Auto focus unit and digital camera Auto focus unit and digital camera

2007-02-21

2010-11-02

Koval, Melissa J (Department: 2862)

Photography

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

Having pursuit mode

C396S153000, C348S352000

Reexamination Certificate

active

07826735

ABSTRACT:
An auto focus unit, comprising a pursuit block, a lens driver, a detection block, and a controller, is provided. The pursuit block pursues the movements of an optical image of the target-object. The auto focus unit brings an optical image of the target-object into focus on a light-receiving surface. The target-object is desired to be brought into focus. The lens driver causes a focus lens to move so that an optical image of a scanning-area is brought into focus. The detection block detects the light intensity of an area including the scanning area. The controller causes the pursuit block to suspend a pursuit of the target-object when the light intensity detected by the detection block is lower than a predetermined threshold value.

REFERENCES:
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patent: 5835641 (1998-11-01), Sotoda et al.
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patent: 6417883 (2002-07-01), Kaneda
patent: 6874955 (2005-04-01), Morishita
patent: 2005/0270408 (2005-12-01), Kwon et al.
U.S. Appl. No. 11/677,191 to Yamaguchi, filed Feb. 21, 2007.

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