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. 23, 2026
Filed:
Apr. 03, 2024
Nikon Corporation, Tokyo, JP;
Yoko Komatsubara, Yokohama, JP;
Takeshi Umeda, Fujisawa, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A variable magnification optical system comprising, in order from an object side, a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group and a fourth lens group; upon varying a magnification, respective distances between neighboring lens groups being varied; the first lens group comprising a negative lens at a most object side and a positive lens at a most image side, the negative lens being a negative meniscus lens having a convex surface facing the object side; and the second lens group comprising, in order from the object side, a 2a lens group having positive refractive power, a 2b lens group having positive refractive power, and a 2c lens group. The optical system satisfies specified conditional expressions.