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:
Mar. 27, 1984
Filed:
Aug. 03, 1981
Applicant:
Inventor:
Shin Yamaguchi, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350427 ; 350423 ;
Abstract
In the compact zoom lens disclosed, a first lens group of positive power includes a negative lens and two positive lenses movable for focusing, a second lens group has a negative refractive power, a positive third lens group has a positive lens and a negative lens, with the image magnification variation being effected by the second and third lens groups, a positive fourth lens group constitutes an image forming section. The relations