Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/095860
Kind Code:
A1
Abstract:
This variable magnification optical system, sequentially from the objective side, comprises: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a subsequent lens group having a plurality of lens groups. The variable magnification optical system is configured such that, when changing magnification, the first and third lens groups are fixed with respect to an image surface, intervals between adjacent lens groups are changed, and the following conditional expression is satisfied. 0.24<(TL/f1)/(ft/fw)<0.55, in which TL represents the distance to the image surface from a lens surface on the furthermost objective side, f1 represents the focal distance of the first lens group, ft represents the focal distance of the variable magnification optical system in the telescopic end state, and fw represents the focal distance of the variable magnification optical system in the wide-angle end state.
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Inventors:
MACHIDA KOSUKE (JP)
KURIBAYASHI TOMONORI (JP)
KURIBAYASHI TOMONORI (JP)
Application Number:
PCT/JP2023/038491
Publication Date:
May 10, 2024
Filing Date:
October 25, 2023
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/16; G02B13/18; G02B15/20
Foreign References:
| JP2020016808A | 2020-01-30 | |||
| JP2021096331A | 2021-06-24 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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