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:
Aug. 12, 2008
Filed:
May. 03, 2005
Mitsuaki Wada, Tokyo, JP;
Mitsuaki Wada, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group Ghaving positive refractive power, a second lens group Ghaving negative refractive power, and a third lens group Ghaving positive refractive power. The second lens group Gis moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group Ghas at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.