Photography – Having variable focal length of camera objective – Automatic change of focal length
Reexamination Certificate
2005-07-18
2009-08-04
Assouad, Patrick J (Department: 2862)
Photography
Having variable focal length of camera objective
Automatic change of focal length
C396S079000, C396S080000, C396S091000, C396S093000, C382S255000
Reexamination Certificate
active
07570879
ABSTRACT:
This invention provides a technique of stably focusing on a major object without any sense of discomfort regardless of differences in lens unit type in a camera body on which a lens unit can be detachably mounted. For this purpose, the type of lens unit connected to the camera is determined. Cutoff frequencies are then set for a low-pass filter and high-pass filter on the basis of the determination result. With regard to frequency component data in predetermined area of an image sensor, a peak hold circuit, integrator, and difference peak hold circuit each generate evaluate value information. A camera microcomputer transmits the obtained evaluate value information to a lens microcomputer in the lens unit.
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Assouad Patrick J
Canon Kabushiki Kaisha
Cowan Liebowitz & Latman P.C.
Strieb Michael A
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