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Title:
OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/220615
Kind Code:
A1
Abstract:
An optical system (LS) comprises a first lens group (G1) having positive refractive power, a second lens group (G2) having positive refractive power, and a third lens group (G3) having negative refractive power, which are arranged in order from the object side, wherein during focusing, the second lens group (G2) moves along an optical axis, and the following conditional expressions are satisfied: -5.000<(-G1R1)/f<500.000 and 0.20

Inventors:
SASHIMA TOMOYUKI (JP)
MASUGI SABURO (JP)
Application Number:
PCT/JP2018/019266
Publication Date:
November 21, 2019
Filing Date:
May 18, 2018
Export Citation:
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Assignee:
NIKON CORP (JP)
International Classes:
G02B13/00; G02B13/18
Foreign References:
JP2013061570A2013-04-04
JP2013125213A2013-06-24
JP2014102358A2014-06-05
JP2012234169A2012-11-29
JP2011209352A2011-10-20
JP2012255842A2012-12-27
JP2012155223A2012-08-16
JPH04338910A1992-11-26
JPH06294932A1994-10-21
JP2002098894A2002-04-05
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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