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:
Jun. 13, 2006
Filed:
Nov. 02, 2005
Kenichi Sato, Ageo, JP;
Takashi Tanaka, Kawagoe, JP;
Kenichi Sato, Ageo, JP;
Takashi Tanaka, Kawagoe, JP;
Fujinon Corporation, Saitama, JP;
Abstract
A zoom lens with a zoom ratio of about three includes a first lens group of negative refractive power that moves along an optical axis during zooming relative to a second lens group of positive refractive power and having a vibration-proof function to correct for hand shaking that causes image blurring. The second lens group includes a first lens subgroup on its object side having positive refractive power and at least one aspheric surface, and a second lens subgroup having positive refractive power. The second lens subgroup is movable in a direction perpendicular to the optical axis of the zoom lens in order to correct for vibration of the zoom lens. The second lens group satisfies a condition regarding the ratio of focal lengths of the two lens subgroups, and the second lens subgroup satisfies a condition regarding its transverse magnification at the telephoto end.