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:
Sep. 09, 2014
Filed:
Sep. 01, 2011
Masaru Eguchi, Saitama, JP;
Masaru Eguchi, Saitama, JP;
Hoya Corporation, Tokyo, JP;
Abstract
A high zoom-ratio 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. Upon zooming, the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases, and the distance between the third and fourth lens groups increases. The first lens group includes a negative lens element, and two positive lens elements. The absolute value of the radius-of-curvature of the image-side surface of the negative lens element within the first lens group is smaller than the absolute value of the radius-of-curvature of the object-side surface of the positive lens element on the object side within the first lens group. The following condition (1) is satisfied:1.95<11  (1),wherein n11 designates the refractive index at the d-line of the negative lens element within the first lens group.