Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/024623
Kind Code:
A1
Abstract:
This variable magnification optical system (CL) includes a front lens group (GA) which has a positive refractive power, a first middle lens group (GM1) which has negative refractive power, a second middle lens group (GM2) which has positive refractive power, and a subsequent lens group (GR); the subsequent lens group (GR) includes a first focus lens group (GF1) which is arranged farthest to the object side of the subsequent lens group (GR), and at least one other focus lens group which is arranged on the image side of the first focus lens group (GF1); of the other focus lens groups, the focus lens group that is nearest to the first focus lens group (GF1) is configured from one lens component, and satisfies the conditional expression below. -6.00 < fFs / fw < 6.00, wherein fFs is the focal length of that focus lens group which has the strongest refractive strength, and fw is the focal length of the variable magnification optical system (EL) in the wide-angle end state.
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2021/024062
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 | |||
| WO2015146067A1 | 2015-10-01 | |||
| WO2014129170A1 | 2014-08-28 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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