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:
May. 15, 1979
Filed:
Mar. 02, 1977
Applicant:
Inventor:
Soichi Nakamura, Kamakura, JP;
Assignee:
Nippon Kogaku K. K., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350183 ; 350176 ; 350214 ; 350215 ; 350216 ; 350220 ;
Abstract
A rear conversion lens system to be mounted on the image side of a photographic lens to enlarge the total focal length of the entire lens system including the photographic lens comprises a diverging group and a converging group disposed on the image side of the diverging group. The diverging group includes, as viewed in order from the object side, a first positive lens component, a negative lens component and a second positive lens component. The converging group includes, as viewed in order from the object side, a positive lens component and a negative lens component.