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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.:

US 12578561 B1

PDFFull Text
Date of Patent:
Mar. 17, 2026

Filed:

Dec. 02, 2020

Zoom optical system, optical apparatus and method for manufacturing the zoom optical system

Applicant:

Nikon Corporation, Tokyo, JP;

Inventors:

Fumiaki Ohtake, Tokyo, JP;

Azuna Nonaka, Yokohama, JP;

Yoshiharu Yuasa, Konosu, JP;

Takeshi Umeda, Fujisawa, JP;

Assignee:

Nikon Corporation, Tokyo, JP;

Attorney:

Potomac Law Group, PLLC

Primary Examiner:

George G King

Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 15/22 (2006.01);
U.S. Cl.
CPC ...
G02B 15/143507 (2019.08); G02B 15/144507 (2019.08); G02B 15/144515 (2019.08); G02B 15/145511 (2019.08); G02B 15/145515 (2019.08); G02B 15/1465 (2019.08); G02B 15/22 (2013.01);
Abstract

A variable magnification optical system (ZL) comprises a preceding lens group (GA) having negative refractive power and a succeeding lens group (GB) having positive refractive power, which are arranged in order from the object side along an optical axis. The succeeding lens group (GB) has a focusing group (GF) and an image-side group (GC) disposed closer to the image side than the focusing group (GF), the focusing group (GF) moves to the image side along the optical axis from focusing on an object at infinity to focusing on a close-distance object, and the following conditional expression is satisfied.1.80<<3.40

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