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:
Nov. 30, 2004
Filed:
Aug. 27, 2003
Applicant:
Inventors:
Takahiro Yoshimi, Tochigi, JP;
Fumiaki Usui, Tochigi, JP;
Assignee:
Canon Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/514 ;
U.S. Cl.
CPC ...
G02B 1/514 ;
Abstract
A small-sized and light weight zoom lens achieving high optical performance, a wide angle of view, and a high magnification, is disclosed. The zoom lens comprises, in order form the object side, a first lens unit with positive optical power, a second lens unit with negative optical power having a magnification varying function, and at least one other lens unit. The first lens unit includes, in order from the object side, a first negative lens element the object side surface of which is concave toward the object side, a second negative lens element, and a positive lens element.