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. 20, 2026
Filed:
Nov. 20, 2018
Nikon Corporation, Tokyo, JP;
Takeru Uehara, Ageo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A zoom optical system comprises a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a succeeding lens group, which are arranged in order from an object side. During zooming, distances between adjacent said lens groups change. The succeeding lens group comprises a first focusing lens group having a negative refractive power which is moved during focusing, and a second focusing lens group having a positive refractive power which is moved during focusing, which are arranged in order from an object side. Further, the following conditional expression is satisfied:0.80<(−1)/2<5.00,