Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/024624
Kind Code:
A1
Abstract:
This variable magnification optical system (ZL) comprises a front-side lens group (GA) having positive refractive power, a first intermediate lens group (GM1) having negative refractive power, a second intermediate lens group (GM2) having positive refractive power, and a subsequent lens group (GR). The subsequent lens group (GR) includes a plurality of focal lens groups that move along the optical axis at the time of focusing, and the following conditional expressions are satisfied. 4.30 < f1/(-fM1w) < 10.00 and 0.10 < BFw/fw < 1.00, where f1 is the focal distance of the front-side lens group (GA), fM1w is the focal distance of the first intermediate lens group (GM1) in the wide-angle end state, BFw is the backfocus of the variable magnification optical system (ZL) in the wide-angle end state, and fw is the focal distance of the variable magnification optical system (ZL) in the wide-angle end state.
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Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2021/024063
Publication Date:
February 03, 2022
Filing Date:
June 25, 2021
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
| WO2019097719A1 | 2019-05-23 |
Foreign References:
| JP2018054989A | 2018-04-05 | |||
| JP2014066944A | 2014-04-17 | |||
| JP2008076493A | 2008-04-03 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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