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:
May. 29, 2012
Filed:
Apr. 01, 2009
Kyoichi Miyazaki, Osaka, JP;
Katsu Yamada, Osaka, JP;
Takuya Imaoka, Kanagawa, JP;
Masaki Sampei, Hyogo, JP;
Yoshio Matsumura, Osaka, JP;
Kyoichi Miyazaki, Osaka, JP;
Katsu Yamada, Osaka, JP;
Takuya Imaoka, Kanagawa, JP;
Masaki Sampei, Hyogo, JP;
Yoshio Matsumura, Osaka, 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 negative lens unit that is arranged on an object side relative to the aperture diaphragm and provided with negative optical power having an absolute value greatest in the entire system and that moves in a direction along an optical axis at the time of zooming; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing such that an interval relative to the negative lens unit should vary.