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:
Jan. 13, 2015
Filed:
Jan. 24, 2013
Applicant:
Panasonic Corporation, Osaka, JP;
Inventors:
Takuya Imaoka, Kanagawa, JP;
Kyoichi Miyazaki, Osaka, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 27/64 (2006.01); G02B 15/22 (2006.01); G02B 15/173 (2006.01);
U.S. Cl.
CPC ...
G02B 15/14 (2013.01); G02B 15/22 (2013.01); G02B 15/173 (2013.01); G02B 27/646 (2013.01);
Abstract
A zoom lens system wherein a positive lens unit located closest to an object side is fixed with respect to an image surface in zooming, a negative lens unit, among lens units located on an image side relative to an aperture diaphragm, is a focusing lens unit which moves along an optical axis in focusing, and the conditions: −1.8<f/f<−0.3 and 0.1<T/f<1.5 (f: a composite focal length of the negative lens unit, T: an axial thickness of the positive lens unit located closest to the object side, f: a focal length of the entire system at a wide-angle limit) are satisfied.