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. 28, 2017
Filed:
Jan. 29, 2016
Hoya Corporation, Tokyo, JP;
Koichiro Hayakawa, Saitama, JP;
Daisuke Koreeda, Saitama, JP;
HOYA CORPORATION, Tokyo, JP;
Abstract
A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, each of the first through fourth lens groups move along the optical axis thereof. The following conditions (1) and (2) are satisfied:1.05<1<1.75  (1), and3.7<33<6.3  (2),wherein fdesignates the focal length of the first lens group, ft designates the focal length of the entire zoom lens system at the long focal length extremity, and Mand Mdesignate the lateral magnifications of the third lens group when focusing on an object at infinity at the long and short focal length extremities, respectively.