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. 13, 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
A zoom lens system includes a compact focusing lens unit and has a suppressed change in image magnification at the time of movement of the focusing lens unit. The system includes an aperture diaphragm, a first lens unit having negative optical power and being closest to the object side, a third lens unit arranged on the object side relative to the aperture diaphragm and being adjacent to the diaphragm, and a fourth lens unit arranged on the image side relative to the aperture diaphragm and being adjacent to the diaphragm. At the time of zooming, interval between the aperture diaphragm and the third lens unit arranged on the object side relative to the diaphragm and being adjacent to the diaphragm varies, and interval between the aperture diaphragm and the fourth lens unit arranged on the image side relative to the diaphragm and being adjacent to the diaphragm varies.