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:
Sep. 01, 1992
Filed:
Jan. 29, 1991
Applicant:
Inventors:
Hiroshi Endo, Kanagawa, JP;
Sadatoshi Takahashi, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G12B / ; G12B / ;
U.S. Cl.
CPC ...
359686 ; 359771 ; 359772 ; 359773 ;
Abstract
A zoom lens is disclosed comprising, from front to rear, a first lens groups of positive power, a second lens group of negative power, a third lens group of positive power, and a fourth lens group, at least two of these four lens groups being moved to effect zooming and the second lens group being moved to effect focusing, and satisfying the following condition: