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:
May. 01, 1987
Applicant:
Inventor:
Sadahiko Tsuji, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaishi, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350426 ; 350450 ;
Abstract
A zoom lens comprising, from front to rear, a first lens unit of negative power and a second lens unit of positive power, both lens being axially moved to effect zooming, in which a diaphragm is arranged between the first and second lens units to remain stationary during zooming.