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. 31, 1987
Filed:
Mar. 07, 1985
Applicant:
Inventor:
Masakazu Yamagata, Tokyo, JP;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350463 ; 350428 ; 350464 ;
Abstract
Herein disclosed is a close-up photographic lens system comprising a first lens group disposed on the object side and having a positive refractive power and a second lens group disposed on the image side and having a negative refractive power. The first lens group is movable relative to the second lens group, thereby focusing the object from an infinite distance to a close-up distance with respect to the lens system. The lens system meets the following conditions.