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Title:
OPTICAL SYSTEM, OPTICAL EQUIPMENT, AND OPTICAL-SYSTEM MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/116563
Kind Code:
A1
Abstract:
An optical system (LS) includes an aperture stop (S), and a positive lens (L13) that is disposed farther on the object side than the aperture stop (S) is and that satisfies the following conditional expressions: ndP1+(0.01425×νdP1) < 2.12; 18.0 <νdP1 < 35.0; and 0.702 <θgFP1+(0.00316×νdP1), where ndP1 is the refractive index of the positive lens with respect to the d-line, νdP1 is the Abbe number of the positive lens with reference to the d-line, and θgFP1 is the partial dispersion ratio of the positive lens. θgFP1 is defined by the following equation: θgFP1 = (ngP1-nFP1)/(nFP1-nCP1), assuming that the refractive index of the positive lens with respect to the g-line is ngP1, the refractive index of the positive lens with respect to the F-line is nFP1, and the refractive index of the positive lens with respect to the C-line is nCP1.

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:
JP2017/045183
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:
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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