Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/039699
Kind Code:
A1
Abstract:
This variable power optical system (ZL(1)) has a plurality of lens groups (G1-G7), and the intervals between the respectively adjacent lens groups change during power variation. The plurality of lens groups include a first focusing lens group (G6) that moves during focusing, and a second focusing lens group (G7) that is disposed closer to the image surface than is the first focusing lens group and moves so as to follow a track different from that of the first focusing lens group. The first focusing lens group (G6) and the second focusing lens group (G7) each have a negative refractive power and satisfy conditional expression: 0.40
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Inventors:
YABUMOTO HIROSHI (JP)
Application Number:
PCT/JP2020/031790
Publication Date:
March 04, 2021
Filing Date:
August 24, 2020
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JP2016080877A | 2016-05-16 | |||
| JP2018092185A | 2018-06-14 | |||
| JP2018022058A | 2018-02-08 | |||
| JPH04186212A | 1992-07-03 | |||
| JP2015018073A | 2015-01-29 | |||
| JP2014153402A | 2014-08-25 | |||
| JP2020086305A | 2020-06-04 | |||
| JP2020106681A | 2020-07-09 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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