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. 15, 2013
Filed:
Jan. 21, 2009
Takakazu Bito, Osaka, JP;
Keiki Yoshitsugu, Hyogo, JP;
Takakazu Bito, Osaka, JP;
Keiki Yoshitsugu, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A zoom lens system of the present invention has a plurality of lens units each composed of at least one lens element and, in order from the object side to the image side, comprises: a first lens unit having negative optical power and composed of two lens elements; a second lens unit having positive optical power; and a third lens unit having positive optical power, wherein in zooming, the lens units are moved such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, and wherein the condition is satisfied: 2.50<tan(ω)×Z<6.00 where, Z=f/f>4.0, ω>35, f, f: focal lengths of the entire system at a telephoto limit, a wide-angle limit, ω: a half value of maximum view angle at a wide-angle limit.