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:
Dec. 18, 2018
Filed:
Aug. 05, 2014
Nikon Corporation, Minato-ku, Tokyo, JP;
Daisaku Arai, Kawasaki, JP;
Takamichi Kurashige, Funabashi, JP;
Nikon Corporation, Tokyo, JP;
Abstract
Provided is a zoom lens having, in order from an object, a first lens group (G) having positive refractive power, a second lens group (G) having negative refractive power, a third lens group (G) having positive refractive power, and a fourth lens group (G) having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group changes, a distance between the second lens group and the third lens group changes, a distance between the third lens group and the fourth lens group changes, and at least the first lens group (G) moves. The first lens group (G) is constituted by a set of cemented lenses, the third lens group (G) is constituted by, in order from the object, a positive lens and a negative lens, and the conditional expression 0.50<TL/ft<1.28 is satisfied, where TL denotes a total length of the zoom lens (ZL) in the telephoto end state, and ft denotes a focal length of the zoom lens (ZL) in the telephoto end state.