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. 01, 2026
Filed:
Feb. 02, 2022
Nikon Corporation, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A variable magnification optical system (ZL) comprises: a first lens group (G) having negative refractive power; and a rear group (GR) including at least one lens group. When changing the magnification, the distances between adjacent lens groups change. At least one lens group of the rear group (GR) includes a final lens group (GE) having positive refractive power and disposed closest to the image side in the rear group (GR). The variable magnification optical system satisfies the following conditional expression. 0.15<ft/fGE<0.60 where ft is the focal length of the variable magnification optical system (ZL) in a telephoto end state, and fGE is the focal length of the final lens group (GE).