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:
Aug. 21, 1990
Filed:
Jul. 28, 1989
Applicant:
Inventor:
Wataru Tatsuno, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350462 ;
Abstract
A retrofocus type wide angle lens is characterized by a first lens group consisting of a meniscus-shaped negative lens whose convex surface is directed toward an object, a second lens group consisting of a biconvex and a negative lens cemented thereto, a third lens group consisting of a biconcave lens, a fourth lens group consisting of a meniscus-shaped positive lens whose convex surface is directed to an image and fifth lens group consisting of a biconvex lens all of which are arranged in the order named from an object side and is further characterized in that the following relations are satisfied ##EQU1## where f=the focal length of the whole system;