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:
Aug. 11, 1992
Filed:
Mar. 07, 1991
Applicant:
Inventor:
Satoshi Iwasaki, Toyokawa, JP;
Assignee:
Minolta Camera Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359689 ; 359679 ;
Abstract
A zoom lens system including, from an enlargement side, a first lens unit of a positive power, a second lens unit of a positive power and a third lens unit of a negative power. The first and third lens units monotonously move toward a reduction side during a zooming operation from the longest focal length condition to the shortest focal length condition, while the second lens unit which is closest to the third lens unit at the longest focal condition moves so as to be most proximate to the first lens unit at the shortest focal length condition. The zoom lens system fulfills the following conditions,