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:
Dec. 08, 1987
Filed:
Aug. 16, 1985
Applicant:
Inventor:
Yoshiharu Saito, Koganei, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350426 ; 350432 ; 350450 ;
Abstract
A standard zoom lens system with a large aperture ratio comprising a front lens group having a negative refracting power, a rear lens group having a positive refracting power and a diaphragm arranged in the rear lens group in which at least one of lens surface of the rear lens group which surface is positioned at the front side of a diaphragm is formed as an aspherical surface, thereby enabling to have various aberrations well corrected and make the system compact.