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Patent Searching and Data


Title:
OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/180359
Kind Code:
A1
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.

Inventors:
MIWA Satoshi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
YABUMOTO Hiroshi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
Application Number:
JP2018/009159
Publication Date:
October 04, 2018
Filing Date:
March 09, 2018
Export Citation:
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Assignee:
NIKON CORPORATION (15-3, Konan 2-chome Minato-k, Tokyo 90, 〒1086290, JP)
International Classes:
G02B13/02; G02B13/18; G02B15/167
Foreign References:
JP2013092575A2013-05-16
JP2016218276A2016-12-22
JP2007121440A2007-05-17
JPH11183800A1999-07-09
JP2004317749A2004-11-11
Attorney, Agent or Firm:
HOSAKA Joyo (SIERRA & CREARE, 9-20-505 Ichibancho, Chiyoda-k, Tokyo 82, 〒1020082, JP)
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