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:
Nov. 09, 2010
Filed:
Oct. 02, 2009
Applicant:
Saburo Masugi, Kawasaki, JP;
Inventor:
Saburo Masugi, Kawasaki, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A zoom lens comprises, in order from an object, a first lens group Ghaving negative refractive power, a second lens group Ghaving positive refractive power, and a third lens group Ghaving positive refractive power. The first lens group Gconsists of one spherical negative lens and one spherical positive lens with an air space therebetween, and the conditional expression 0.50<(DGDGDG)/fw<1.75 is satisfied, where DGto DGdenote the thickness of the first lens group Gto third lens group Grespectively on the optical axis, and fw denotes the focal length of the zoom lens in the wide-angle end state.