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:
Jan. 09, 2007
Filed:
Dec. 10, 2004
Applicant:
Keiko Mizuguchi, Kawasaki, JP;
Inventor:
Keiko Mizuguchi, Kawasaki, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
An object of the present invention is to provide a fisheye lens, in spite of its compactness, having an angle of view of 180 degrees and a fast f-number of 2.8 with securing sufficient back focal length and suitable for a digital camera. The fisheye lens consists of a front lens group Ghaving negative refractive power and a rear lens group Ghaving positive refractive power locating with a space along the optical axis apart from the front lens group G. The front lens group Gincludes a plurality of negative lens components, Land L. The rear lens group Gincludes at least one cemented lens L, and given conditional expressions are satisfied.