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:
Mar. 22, 2011
Filed:
Nov. 20, 2008
Susumu Sato, Yotsukaido, JP;
Susumu Sato, Yotsukaido, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A zoom lens includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, which are disposed in order from an object along the optical axis, wherein the third lens group comprises: a pre-group, which has a first positive lens, a negative meniscus lens having a convex surface facing the object, a second positive lens, and which has a positive refractive power; and a negative meniscus lens having a convex surface facing the object, which are disposed in order from the object; at least one of three surfaces of an object side and image side lens surfaces of the first positive lens and an object side lens surface of the negative meniscus lens is aspherical; and at least one of three surfaces of an object side lens surface of the second positive lens, and an object side and image side lens surfaces of the negative meniscus lens is aspherical.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile