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:
Oct. 09, 2012
Filed:
Jan. 08, 2011
Norio Murayama, Musashino, JP;
Sayako Yamamoto, Kawasaki, JP;
Norio Murayama, Musashino, JP;
Sayako Yamamoto, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
The present invention provides a zoom lens ZL comprising a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, a third lens group Ghaving positive refractive power, and a fourth lens group Ghaving positive refractive power, the first lens group Gincluding a negative meniscus lens Land a positive meniscus lens L, the second lens group Gincluding a negative meniscus lens L, a biconcave negative lens Land a positive meniscus lens L, and the fourth lens group Gincluding one positive lens L, and the refractive indexes of at least three lenses in the zoom lens ZL being greater than 1.9.