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Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND PRODUCTION METHOD FOR VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/136743
Kind Code:
A1
Abstract:
A variable power optical system (ZL) comprising, in order from the object side, a first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, a fourth lens group (G4) having a positive refractive power, and a rear lens group (GR), wherein the intervals between adjacent lens groups are changed when changing the power, and the rear lens group (GR) has a plurality of focal lens groups that have a positive refractive power and move when focusing.

Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2018/047775
Publication Date:
July 02, 2020
Filing Date:
December 26, 2018
Export Citation:
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Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
JP2018054989A2018-04-05
JP2016139125A2016-08-04
JP2015215438A2015-12-03
JP2014102462A2014-06-05
JP2014157225A2014-08-28
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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