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. 11, 2019
Filed:
Dec. 25, 2015
Nikon Corporation, Minato-ku, Tokyo, JP;
Kensuke Uchida, Fujisawa, JP;
Akihiko Obama, Tokyo, JP;
Norikazu Yokoi, Yokohama, JP;
Hiroshi Yamamoto, Kawasaki, JP;
Taku Matsuo, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A variable magnification optical system includes: a first lens group having positive refractive power and arranged closest to an object; a negative lens group having negative refractive power; a positive lens group which has positive refractive power, which includes at least one lens that moves integrally with an aperture stop, and which is arranged closer to an image than the negative lens group; and a focusing group arranged between the negative lens group and the positive lens group. When varying magnification, distances between the first lens group and the negative lens group and between the negative lens group and the positive lens group are changed. When focusing, distances between the focusing group and a lens facing an object-side of the focusing group and between the focusing group and a lens facing an image-side of the focusing group are changed. A predetermined conditional expression is satisfied.