Title:
ZOOM OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD OF MANUFACTURING ZOOM OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JP2022163900
Kind Code:
A
Abstract:
To provide a zoom optical system which is compact and yet offers good optical performance.SOLUTION: A zoom optical system ZL provided herein consists of a first lens group G1 having negative refractive power and a rear group GR comprising at least one lens group, and is configured such that distances between adjacent lens groups change while zooming. At least a part of a lens group belonging to the rear group GR is a focusing group GF with positive refractive power configured to move along an optical axis while focusing. The zoom optical system satisfies the following conditional expression: 0.50
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Inventors:
ISHIKAWA TAKAHIRO
OTAKE FUMIAKI
KOJIMA TOMOYUKI
OTAKE FUMIAKI
KOJIMA TOMOYUKI
Application Number:
JP2021069020A
Publication Date:
October 27, 2022
Filing Date:
April 15, 2021
Export Citation:
Assignee:
NIKON CORP
International Classes:
G02B15/20; G02B13/18
Attorney, Agent or Firm:
Shogo Onishi
Toshiaki Namiki
Toshiaki Namiki