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Patent Searching and Data


Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/097669
Kind Code:
A1
Abstract:
A variable magnification optical system comprises, in order from an object, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a subsequent lens group. When the magnification changes, the first lens group is fixed relative to an image surface while an interval between mutually adjacent lens groups changes. The subsequent lens group has a focus lens group that moves when focusing on an object. The variable magnification optical system satisfies a prescribed conditional expression. Thus, it is possible to successfully suppress aberration variation when the magnification changes.

Inventors:
ITO, Tomoki (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
Application Number:
JP2017/041445
Publication Date:
May 23, 2019
Filing Date:
November 17, 2017
Export Citation:
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Assignee:
NIKON CORPORATION (15-3, Konan 2-chome Minato-k, Tokyo 90, 〒1086290, JP)
International Classes:
G02B15/16; G02B15/163; G02B15/20
Domestic Patent References:
WO2016017726A12016-02-04
Foreign References:
JP2017116678A2017-06-29
JP2014202806A2014-10-27
JP2013218290A2013-10-24
JP2013109013A2013-06-06
JP2007164157A2007-06-28
JP2011118037A2011-06-16
JPH06289291A1994-10-18
JPH0560971A1993-03-12
JP2013254020A2013-12-19
JP2007279351A2007-10-25
Attorney, Agent or Firm:
INOUE & CO. et al. (2F Shinsei Bldg, 7-6 Taito 4-chome, Taito-k, Tokyo 16, 〒1100016, JP)
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