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:
Mar. 11, 2014
Filed:
Feb. 01, 2013
Panasonic Corporation, Osaka, JP;
Shunichiro Yoshinaga, Osaka, JP;
Kyoichi Miyazaki, Osaka, JP;
Takao Yamanaka, Osaka, JP;
Keiichi Zaitsu, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A single focal length lens system comprising a front lens unit, an aperture diaphragm, and a rear lens unit, wherein the front lens unit is composed of three or less lenses including a negative lens located closest to the object side and a positive lens located on the image side relative to the negative lens, and does not move along an axis in focusing, the rear lens unit includes a focusing lens unit moving along the axis and a fixed lens unit not moving along the axis in focusing, and the conditions: 0.4<f/f<1.5, 0.9<f/T<4.5, and −0.3<f/f<0.3 (f, f, f: focal lengths of the entire single focal length lens system, the focusing lens unit, the front lens unit, T: an axial distance from an object side lens surface of the negative lens to the aperture diaphragm) are satisfied.