Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/190739
Kind Code:
A1
Abstract:
A variable magnification optical system comprising, in order from the object side, a first lens group, a second lens group, a third lens group, and a rear group is configured such that when magnification is changed, the distances between adjacent lens groups change, at a predetermined imaging distance, the variable magnification optical system has a plurality of focused states with different aberration amounts, the rear group has a first focusing lens group that moves during focusing, and a second focusing lens group that is disposed closer to the image side than the first focusing lens group, and moves along a trajectory different from that of the first focusing lens group during focusing, and during the transition from one focused state to another focused state at the predetermined imaging distance, the first focusing lens group and the second focusing lens group move, and satisfy the following conditional expression. -6.80 < f1/f2 < -0.05 where f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.
More Like This:
| JP4955414 | Zoom lens and imaging device |
| JP6496871 | Imaging optical lens |
| JP2002323654 | COMPACT ZOOM LENS |
Inventors:
ONO TAKURO (JP)
Application Number:
PCT/JP2023/012935
Publication Date:
October 05, 2023
Filing Date:
March 29, 2023
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/18; G02B15/20
Foreign References:
| JP2014021257A | 2014-02-03 | |||
| JP2020064175A | 2020-04-23 | |||
| JP2021167973A | 2021-10-21 | |||
| JP2018097240A | 2018-06-21 | |||
| JP2022021154A | 2022-02-02 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Download PDF: