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:
Dec. 27, 2011
Filed:
Jan. 29, 2010
Kyoichi Miyazaki, Osaka, JP;
Keiichi Zaitsu, Osaka, JP;
Kyoichi Miyazaki, Osaka, JP;
Keiichi Zaitsu, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided is a zoom lens system including a compact focusing lens unit and having a suppressed change in image magnification at the time of movement of the focusing lens unit. A zoom lens system of the present invention, in order from an object side to an image side, includes, a first lens unit Ghaving negative optical power, a second lens unit Ghaving positive optical power, a third lens unit Ghaving positive optical power, and a fourth lens G. Condition (10): 1.4<DL/YM<2.5 and condition (11): 1.2<BF/YM<1.6 are satisfied (where, 100<2ω<140, DL is an effective diameter of the lens surface closest to the image side, BFis the back focus at a wide-angle limit, YM is the maximum image height at a wide-angle limit, and ωis a half view angle (°) at a wide-angle limit).