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Patent Searching and Data


Title:
OPTICAL SYSTEM, OPTICAL EQUIPMENT, AND OPTICAL SYSTEM MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/116568
Kind Code:
A1
Abstract:
An optical system (LS) includes lenses (L22, L33) satisfying the following conditional expressions: νdLZ < 35.0; and 0.702 <θgFLZ+(0.00316×νdLZ), where νdLZ is the Abbe number of the lenses using the d-line as a reference, and θgFLZ is the partial dispersion ratio of the lenses, and defined as θgFLZ = (ngLZ-nFLZ)/(nFLZ-nCLZ), assuming that the refractive index of the lenses with respect to the g-line is ngLZ, the refractive index of the lenses with respect to the F-line is nFLZ, and the refractive index of the lenses with respect to the C-line is 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:
JP2017/045188
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
JP2013025087A2013-02-04
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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