Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/136747
Kind Code:
A1
Abstract:
This variable magnification optical system (ZL) has, 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, a fifth lens group (G5) having a positive refractive power, a sixth lens group (G6) having a positive refractive power, and a seventh lens group (G7) having a negative refractive power, wherein the intervals between adjacent lens groups change when changing the magnification.
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2018/047779
Publication Date:
July 02, 2020
Filing Date:
December 26, 2018
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
| JP2018169563A | 2018-11-01 | |||
| JP2016045435A | 2016-04-04 | |||
| JP2016224157A | 2016-12-28 | |||
| JP2017129668A | 2017-07-27 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Download PDF: