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:
Apr. 06, 2010
Filed:
Jan. 23, 2008
Takashi Tanaka, Saitama, JP;
Takashi Tanaka, Saitama, JP;
Fujinon Corporation, Saitama-shi, Saitama, JP;
Abstract
A zoom lens capable of image stabilization is provided and includes: in order from the object side, a positive first group fixed in variable magnification, a negative second group having a variable magnification function, a positive third group fixed in variable magnification, and a positive fourth group having a correction function for an image plane variation depending upon variable magnification and a focusing function. In the third group, there are arranged a positive 3a-th group, a negative 3b-th group, and a positive 3c-th group in this order from the object side. Blurring of a taken image caused by a vibration of this variable magnification optical system is corrected by moving the 3b-th group in a direction approximately orthogonal to the optical axis. Further, a specific conditional expression relating to power of the third group and a specific conditional expression relating to a power distribution of lens groups of the third group Gare satisfied.