Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE AND METHOD FOR PRODUCING VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/105111
Kind Code:
A1
Abstract:
The present invention provides a variable power optical system which is composed of a plurality of lens groups including a first negative lens group having a negative refractive power, a second negative lens group that is arranged on the image side of the first negative lens group, and a third negative lens group that is arranged on the image side of the second negative lens group and has a negative refractive power, and which is configured such that: the distances between lens groups adjacent to each other are changed during zooming; the first negative lens group is able to move so as to include a component in a direction perpendicular to the optical axis, while serving as a vibration-reduction lens group; the second negative lens group moves along the optical axis during focusing; and a specific conditional expression is satisfied. Consequently, the present invention is able to provide a variable power optical system which has high optical performance, while having a vibration-reduction lens group that is reduced in size.
Inventors:
ISHIKAWA TAKAHIRO (JP)
YOKOI NORIKAZU (JP)
YOKOI NORIKAZU (JP)
Application Number:
PCT/JP2018/042794
Publication Date:
May 28, 2020
Filing Date:
November 20, 2018
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Domestic Patent References:
| WO2018066648A1 | 2018-04-12 | |||
| WO2018066649A1 | 2018-04-12 | |||
| WO2014132291A1 | 2014-09-04 | |||
| WO2018092295A1 | 2018-05-24 |
Foreign References:
| JP2014044246A | 2014-03-13 | |||
| JP2015018124A | 2015-01-29 | |||
| JP2018169564A | 2018-11-01 |
Attorney, Agent or Firm:
INOUE & CO. et al. (JP)
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