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:
Jan. 15, 1991
Filed:
Sep. 15, 1988
Applicant:
Inventors:
Kazuyoshi Hata, Osaka, JP;
Masami Tanaka, Osaka, JP;
Assignee:
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350423 ; 350475 ;
Abstract
A zoom lens system comprises from the object side to the image side: a first lens unit of a positive refractive power; a second lens unit of a negative refractive power; and a third lens unit of a positive refractive power; wherein one of the first and third lens units is shiftable along the optical axis of the lens system in both of the zooming operation and the focusing operation, and the second lens unit is also shiftable along the optical axis of the lens system in the zooming operation.