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:
Oct. 16, 1990
Filed:
Aug. 11, 1989
Applicant:
Inventor:
Juro Kikuchi, Yamanashi, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350481 ; 350423 ;
Abstract
A compact zoom lens system consisting of a small number of lens elements and having a short total length, said zoom lens system comprising a first lens unit having positive refractive power and a second lens unit having negative refractive power which are arranged in the order from the object side, an aperture stop arranged in said first lens unit, at least one lens component arranged after said aperture stop in said first lens unit and at least one graded refractive index lens having refractive index gradient in the direction perpendicular to the optical axis in said first lens unit.