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:
Oct. 22, 2019
Filed:
Oct. 20, 2016
Nikon Corporation, Minato-ku, Tokyo, JP;
Akihiko Obama, Tokyo, JP;
Kensuke Uchida, Fujisawa, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, a fifth lens group are arranged in order from an object. Respective distances between the first and second lens groups, the second and third lens groups, the third and fourth lens groups, and the fourth lens and fifth lens groups change upon zooming, and a lens group arranged closest to an image is approximately fixed relative to an image surface upon zooming. The third lens group moves along the optical axis upon focusing, and the following expression (1) is satisfied:0.480<3/<4.000  (1)where ft denotes a focal length of the zoom optical system in a telephoto end state, and f3 denotes a focal length of the third lens group.