Title:
OPTICAL SYSTEM, OPTICAL APPARATUS, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/039005
Kind Code:
A1
Abstract:
This optical system (OL) comprises, in order from the object side along the optical axis, a front group (GA), a diaphragm (S), and a rear group (GB). The rear group (GB) has a first focusing lens group (GF1) that has a negative refractive power and is positioned furthest toward the object side in the rear group (GB), and a second focusing lens group (GF2) that has a negative refractive power and is positioned closer to the image-surface side than the first focusing lens group (GF1). The first focusing lens group (GF1) and the second focusing lens group (GF2) move in respectively different trajectories toward the image-surface side along the optical axis during focusing from an object at infinity to a close-distance object.
Inventors:
MURATANI MAMI (JP)
Application Number:
PCT/JP2021/028398
Publication Date:
February 24, 2022
Filing Date:
July 30, 2021
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/00; G02B15/20
Foreign References:
| JP2019191229A | 2019-10-31 | |||
| JP2016118770A | 2016-06-30 | |||
| JP2019184968A | 2019-10-24 | |||
| JP2009169051A | 2009-07-30 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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