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:
Sep. 20, 1994
Filed:
Jan. 12, 1993
Applicant:
Inventors:
Seiji Shimizu, Tokyo, JP;
Masaru Takashima, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359675 ; 359784 ;
Abstract
The invention is directed to a compact rear converter lens that has a high zoom ratio of the order of 1.7 to 2.0, is corrected in terms of various aberrations in a well-balanced manner, is little affected by production errors, and is made so compact that it can be built in a compact camera. This rear converter lens that has a negative focal length comprises three lenses or a first lens of negative power, a second lens of positive power and a third lens of negative power, conforms to