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1. (WO2018180359) OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM

Pub. No.:    WO/2018/180359    International Application No.:    PCT/JP2018/009159
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Mar 10 00:59:59 CET 2018
IPC: G02B 13/02
G02B 13/18
G02B 15/167
Applicants: NIKON CORPORATION
株式会社ニコン
Inventors: MIWA Satoshi
三輪 哲史
YABUMOTO Hiroshi
籔本 洋
Title: OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Abstract:
[Problem] To provide an optical system having excellent imaging performance, an optical device, and a method for manufacturing an optical system. [Solution] An optical system OL for use in an optical device such as a camera 1 includes a diffractive optical element GD and a specific lens Lp that is formed from at least one crystalline glass. The specific lens Lp satisfies the conditions of the following expression: θgFp + 0.0017 × νdp < 0.730 Where θgFp represents the partial dispersion ratio of the specific lens Lp as the medium and νdp represents Abbe number for D line of the specific lens Lp as the medium.