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. 22, 2009
Filed:
May. 27, 2008
Keiki Yoshitsugu, Hyogo, JP;
Katsu Yamada, Osaka, JP;
Yoshito Miyatake, Osaka, JP;
Kazuhiko Ishimaru, Osaka, JP;
Keiki Yoshitsugu, Hyogo, JP;
Katsu Yamada, Osaka, JP;
Yoshito Miyatake, Osaka, JP;
Kazuhiko Ishimaru, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a first cemented lens element of two lens elements having power of mutually different signs and a second cemented lens element of two lens elements having power of mutually different signs; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<αi<20.0 and (I-2): n≧1.9 (where, 3.2<f/fand ω>35, αiis an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit, nis a refractive index of the first lens element to the d-line, ωis a half view angle at a wide-angle limit, and fand fare focal lengths of the entire system at a telephoto limit and a wide-angle limit, respectively) are satisfied.