The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2011
Filed:
Mar. 09, 2006
Shinichi Masuda, Hachioji, JP;
Shinichi Masuda, Hachioji, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
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.