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:
Feb. 08, 2005
Filed:
Dec. 05, 2002
Hitoshi Mukaiya, Tochigi, JP;
Hitoshi Mukaiya, Tochigi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom optical system capable of selecting different focusing methods is disclosed. This zoom optical system includes a variable power unit that performs a variable power operation while moving during zooming; a first focusing unit positioned in front of the variable power unit; a second focusing unit positioned at the back of the variable power unit; a sensor that detects the position of the first focusing unit; and a memory that stores movement information of the second focusing unit during zooming according to the position of the first focusing unit. Herein, the second focusing unit changes in the moving locus thereof during zooming, based on the position information about the first focusing unit detected by the sensor and the information from the memory.