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Title:
OPTICAL SYSTEM, OPTICAL EQUIPMENT, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/116569
Kind Code:
A1
Abstract:
An optical system (LS) includes lenses (L22, L33) satisfying the following conditional expressions: ndLZ + (0.01425 × νdLZ) < 2.12; and 0.702 <θgFLZ + (0.00316 × νdLZ), where ndLZ signifies the refractive index of the lenses at the d line, νdLZ signifies the Abbe number of the lenses at the d line, and θgFLZ signifies the partial dispersion ratio of the lenses, which is defined by the following equation when the refractive index of the lenses in at the g line is signified by ngLZ, the refractive index of the lenses at the F line is signified by nFLZ, and the refractive index of the lenses at the C line is signified by nCLZ: θgFLZ = (ngLZ - nFLZ) / (nFLZ - nCLZ).

Inventors:
YAMASHITA, Masashi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
ITO, Tomoki (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
YABUMOTO, Hiroshi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
YAMAMOTO, Hiroshi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
MIWA, Satoshi (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
TSUBONOYA, Keisuke (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
MAKIDA, Ayumu (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
UEHARA, Takeru (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
Application Number:
JP2017/045189
Publication Date:
June 20, 2019
Filing Date:
December 15, 2017
Export Citation:
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Assignee:
NIKON CORPORATION (15-3, Konan 2-chome Minato-k, Tokyo 90, 〒1086290, JP)
International Classes:
G02B13/00; G02B13/02; G02B13/04; G02B15/20
Foreign References:
JP2006301508A2006-11-02
JP2007025653A2007-02-01
JP2006349948A2006-12-28
JP2009280724A2009-12-03
JP2017190280A2017-10-19
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (S.OHNISHI & ASSOCIATES, HIGASHI-IKEBUKURO SS BUILDING 1F 3-20-3, Higashi-Ikebukuro, Toshima-k, Tokyo 13, 〒1700013, JP)
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