Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/136745
Kind Code:
A1
Abstract:
A variable power optical system (ZL) includes, lined up 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 interval between adjacent lens groups is changed in order to vary the power, the rear lens group (GR) includes a focusing lens group that moves during focusing, the third lens group (G3) is formed from at least one lens having a positive refractive power, and the following conditional expression is satisfied. 0.20
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2018/047777
Publication Date:
July 02, 2020
Filing Date:
December 26, 2018
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
| WO2015146067A1 | 2015-10-01 | |||
| WO2015162883A1 | 2015-10-29 |
Foreign References:
| JP2017191126A | 2017-10-19 | |||
| JP2016139125A | 2016-08-04 | |||
| JP2014157225A | 2014-08-28 | |||
| JP2001108902A | 2001-04-20 | |||
| JPH10268194A | 1998-10-09 | |||
| JP2016173556A | 2016-09-29 | |||
| JP2018072367A | 2018-05-10 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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