Photography – Having variable focal length of camera objective – Having focus operation
Reexamination Certificate
2009-01-08
2010-10-26
Fuller, Rodney E (Department: 2862)
Photography
Having variable focal length of camera objective
Having focus operation
C348S345000, C348S353000
Reexamination Certificate
active
07822332
ABSTRACT:
An imaging apparatus to which a lens apparatus is detachably attached includes an image sensor configured to generate an image signal by photoelectrically converting an object image, a first acquisition unit configured to acquire a contrast value of the image signal acquired by the image sensor, a second acquisition unit configured to acquire lens position information at a predetermined time interval, and a focus detection unit configured to detect a focal position based on outputs of the first acquisition unit and the second acquisition unit, wherein the focus detection unit selects the lens position information that corresponds to the contrast value acquired by the first acquisition unit from a plurality of pieces of the lens position information acquired by the second acquisition unit at the predetermined time interval, and detects the focal position.
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Canon Kabushiki Kaisha
Canon U.S.A. Inc. I.P. Division
Fuller Rodney E
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