Television – Camera – system and detail – Optics
Reexamination Certificate
2006-03-09
2011-10-04
Lam, Hung (Department: 2622)
Television
Camera, system and detail
Optics
C348S240990
Reexamination Certificate
active
08031257
ABSTRACT:
A zoom lens control apparatus, which moves a first lens group and a second lens group positioned behind the first lens group on the optical axis of the first lens group with respect to a photographic subject in the optical axis direction when performing a zoom operation, converts a photographic subject optical image entering through the first and the second lens groups into image data at preset time intervals, calculates a focus evaluation value indicating the state of focus based on the acquired image data, and moves the first and the second lens groups so that the calculated focus evaluation value approaches its maximum. The second lens group is moved in a preset optical axis direction from the beginning to the end of focusing control, and the first lens group is moved in the preset optical axis direction at the end of focusing control.
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Canon Kabushiki Kaisha
Canon U.S.A. Inc. IP Division
Lam Hung
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