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. 09, 2016
Filed:
Jul. 04, 2013
Konica Minolta, Inc., Chiyoda-ku, JP;
Nikon Corporation, Minato-ku, JP;
KONICA MINOLTA, INC., Tokyo, JP;
NIKON CORPORATION, Tokyo, JP;
Abstract
A zoom lens system having a negative first lens group and a positive second lens group, from an object side, and achieving zooming by varying a group-to-group distance. The second lens group includes a three-element cemented lens which is a set of three lens elements cemented together including, from the object side, a negative first lens, a positive second lens, and a negative third lens, and the three-element cemented lens fulfills conditional formulas 0.08<(rs+rs)/(rs−rs)<0.5, 27<v-v<40, 20<v-v<38 (rs, rsrepresent the curvature radius of the sides of cemented surfaces of the three-element cemented lens on the object side and the image side respectively, and v-represent the Abbe numbers of the first to third lenses of the three-element cemented lens).