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:
Jan. 06, 2026
Filed:
Dec. 26, 2018
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 first intermediate lens group (GM) having a positive refractive power, a second intermediate lens group (Gd) having a positive or negative refractive power, and a last lens group (GLT) having a positive or negative refractive power. Upon zooming, distances between adjacent lens groups change. The second intermediate lens group (GM) includes a focusing lens group that moves upon focusing. The first lens group (G) includes, a 1-1st lens having a negative refractive power and a 1-2nd lens having a positive refractive power. The zoom optical system satisfies a following conditional expression.0.010<1/1<0.075where dP1: a sum of a center thickness of the 1-1st lens and a center thickness of the 1-2nd lens, and