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. 01, 1988
Filed:
Jun. 07, 1985
Applicant:
Inventors:
Hikaru Hayashi, Nagano, JP;
Hiroshi Takase, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350465 ; 350422 ;
Abstract
A rear conversion lens system to be used for varying the focal length being inserted to the space between an objective for a single-lens reflex camera and film surface, the rear conversion lens system comprising a first lens component arranged as a positive lens, a second lens component arranged as a negative lens, a third lens component arranged as a positive meniscus lens, a fourth lens component arranged as a biconcave lens, and a fifth lens component arranged as a positive cemented doublet, the rear conversion lens system being arranged that the magnification is higher than 1.6 and aberrations are corrected favorably.