Title:
OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/039695
Kind Code:
A1
Abstract:
An optical system comprising a plurality of lens groups arranged on an optical axis and comprising a leading lens group, a first focal lens group, and a second focal lens group. The leading lens group is arranged further on the object side than the first focal lens group and the second focal lens group is arranged further on the image side than the first focal lens group. The first focal lens group has positive refractive power and moves along the optical axis to the image side when focusing from an infinite object to a short-distance object. The second focal lens group: has a negative refractive power; travels along the optical axis to the object side when focusing from an infinite object to a short-distance object; and has, between the first focal lens group and the second focal lens group, an intermediate lens group that includes at least one lens.
Inventors:
OHTAKE FUMIAKI (JP)
Application Number:
PCT/JP2020/031786
Publication Date:
March 04, 2021
Filing Date:
August 24, 2020
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/04; G02B13/18
Foreign References:
| JP2017122745A | 2017-07-13 | |||
| JP2019066701A | 2019-04-25 | |||
| JP2015197593A | 2015-11-09 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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