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:
Feb. 15, 2011
Filed:
Jan. 28, 2010
Hiroshi Yamamoto, Kawasaki, JP;
Satoshi Miwa, Yokohama, JP;
Takeshi Suzuki, Yokohama, JP;
Haruo Sato, Kawaguchi, JP;
Hiroshi Yamamoto, Kawasaki, JP;
Satoshi Miwa, Yokohama, JP;
Takeshi Suzuki, Yokohama, JP;
Haruo Sato, Kawaguchi, JP;
Nkon Corporation, Tokyo, JP;
Abstract
A zoom lens ZL installed in a single-lens reflex digital cameraand the like includes, in order from an object side, a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, and a rear lens group GR having positive refractive power. The second lens group Gincludes at least one positive lens and a negative lens disposed adjacent to the object side of the positive lens having largest refractive power among the positive lenses. Each distance between lens groups varies upon zooming from a wide-angle end state and a telephoto end state. Thereby providing a zoom lens having excellent optical performance, an optical apparatus equipped the zoom lens, and a method for manufacturing the zoom lens.