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:
May. 07, 1996
Filed:
Feb. 03, 1994
Applicant:
Inventors:
Fumiaki Usui, Kanagawa, JP;
Shigeru Oshima, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359684 ; 359683 ; 359688 ;
Abstract
A zoom lens wherein a portion of the zoom lens moves for focusing has, from front to rear, a first lens unit of positive refractive power, at least a rear lens part of the first lens unit being moved to effect focusing. A plurality of lens units are provided to effect zooming, and these lens units move along an optical axis. Focusing from an infinitely distant object to an object at a minimum distance is performed by (i) moving the at least rear lens part forward, and (ii) moving one movable lens unit of the plurality of lens units forward into a space vacated by the rear lens part moving forward.