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:
Jun. 15, 2004
Filed:
Mar. 25, 2003
Applicant:
Inventor:
Akihisa Horiuchi, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 1/514 ;
U.S. Cl.
CPC ...
G02B 1/514 ;
Abstract
A small zoom lens system which realizes a high magnification ratio and high optical performance is disclosed. The zoom lens system comprises, in order from a front side to a rear side, a first lens unit which has a positive power, a second lens unit which has a negative power, a third lens unit which has a positive power, and a fourth lens unit which has a positive power. The lens unit and the fourth lens unit are moved in an optical axis direction during zooming. The aforementioned object is achieved by specifying the configuration the second lens unit or specifying an effective diameter of the first or second lens unit.