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:
Dec. 31, 2013
Filed:
Nov. 24, 2009
Toshinori Take, Yokohama, JP;
Toshinori Take, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A zoom lens ZL installed in an electronic still 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, a third lens group Ghaving positive refractive power, and a fourth lens group Ghaving positive refractive power, a given conditional expressions are satisfied, where rF denotes a radius of curvature of an image side lens surface of the cemented lens in the third lens group, and rR denotes a radius of curvature of an object side lens surface of the negative meniscus lens in the third lens group, thereby providing a zoom lens having excellent optical performance, an optical apparatus equipped therewith, and a method for manufacturing the zoom lens.