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:
Oct. 21, 2014
Filed:
Feb. 01, 2011
Shunichiro Yoshinaga, Hyogo, JP;
Isamu Izuhara, Osaka, JP;
Nobuyuki Adachi, Tokyo, JP;
Kyoichi Miyazaki, Osaka, JP;
Shunichiro Yoshinaga, Hyogo, JP;
Isamu Izuhara, Osaka, JP;
Nobuyuki Adachi, Tokyo, JP;
Kyoichi Miyazaki, Osaka, JP;
Panasonic Corporation, Kadoma-shi, JP;
Abstract
A compact and lightweight zoom lens system having excellent imaging performance, which is favorably applicable to an interchangeable-lens type digital camera system, is provided. The zoom lens system of the present invention includes, in order from an object side to an image side, a first lens unit having positive optical power and composed of not more than two lens elements, a second lens unit having negative optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power. In zooming from a wide-angle limit to a telephoto limit, the fourth lens unit moves along an optical axis. Further, the following conditions are satisfied: 1.50<nd<1.72, 50<vd<75 (nd: a refractive index to the d line of a positive lens element constituting the first lens unit, vd: an Abbe number of a positive lens element constituting the first lens unit).