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. 07, 1999
Filed:
Jan. 20, 1998
Applicant:
Inventors:
Koichi Ohshita, Tokyo, JP;
Atsushi Shibayama, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359753 ; 359716 ;
Abstract
A super-wide angle lens, sequentially from an object side, comprises a first negative lens L1, a second negative lens L2, and a third positive lens L3. The first negative lens L1 with its concave surface toward an image side has an image-side surface with a curvature larger than that on an object-side surface. The second negative lens L2 is disposed at a predetermined spacing from the first negative lens L1 and takes a negative meniscus shape with its convex surface toward the object side. The third positive lens L3 has its convex surface toward the object side.