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:
Jun. 25, 2013
Filed:
Apr. 01, 2009
Kyoichi Miyazaki, Osaka, JP;
Katsu Yamada, Osaka, JP;
Takuya Imaoka, Kanagawa, JP;
Masaki Sampei, Hyogo, JP;
Kyoichi Miyazaki, Osaka, JP;
Katsu Yamada, Osaka, JP;
Takuya Imaoka, Kanagawa, JP;
Masaki Sampei, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit. The plurality of lens units include a focusing lens unit that is arranged on an object side relative to the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing. Further, the zoom lens system satisfies at least one of the following conditions: (1) 1.2<|f/f|<6.0; and (2) 0.10<|f/f|<1.8 (here, f/f>3.0, f: a focal length of the focusing lens unit, f: a focal length of the entire system at a telephoto limit, f: focal length of the entire system at a wide-angle limit).