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:
Sep. 17, 2024
Filed:
Jul. 13, 2023
Nikon Corporation, Tokyo, JP;
Kosuke Machida, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A zoom optical system (ZL) comprises, in order from an object: a first lens group (G) having a positive refractive power; a second lens group (G) having a negative refractive power; a third lens group (G) having a positive refractive power; and a subsequent lens group (GR), wherein upon zooming, a distance between the first lens group (G) and the second lens group (G) changes, a distance between the second lens group (G) and the third lens group (G) changes, and a distance between the third lens group (G) and the subsequent lens group (GR) changes, the subsequent lens group (GR) comprises a focusing lens group that moves upon focusing, and the second lens group (G) comprises a partial group that satisfies following conditional expressions, 1.40<fvr/f2<2.30, 1.80<f1/fw<3.50 where fvr: a focal length of the partial group, f2: a focal length of the second lens group (G), f1: a focal length of the first lens group (G), and fw: a focal length of the zoom optical system (ZL) in a wide-angle end state.