Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/136746
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 has a positive refractive power and moves during focusing, and the following conditional expression is satisfied. 3.40
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2018/047778
Publication Date:
July 02, 2020
Filing Date:
December 26, 2018
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JP2018054989A | 2018-04-05 | |||
| JP2011013536A | 2011-01-20 | |||
| JP2009192771A | 2009-08-27 | |||
| US20140247505A1 | 2014-09-04 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Download PDF: