Title:
OPTICAL SYSTEM, OPTICAL APPARATUS, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/195372
Kind Code:
A1
Abstract:
This optical system, having a first negative lens having a negative refractive power, a second negative lens having a negative refractive power, and a rear group in the stated order from an object side, is configured so as to satisfy all of the following conditional expressions: 5.60 < TL/f < 13.00, 0.30 < f1/f2 < 2.00, 1.66 < Nave12 < 2.20, and 80.00 < 2ω, where TL is the total length of the optical system, f is the focal length of the optical system overall, f1 is the focal length of the first negative lens, f2 is the focal length of the second negative lens, Nave12 is the average of the refractive indices of the first negative lens and the second negative lens, and 2ω is the total angle of view of the optical system.
Inventors:
KURASHIGE TAKAMICHI (JP)
Application Number:
PCT/JP2023/012224
Publication Date:
October 12, 2023
Filing Date:
March 27, 2023
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/04; G02B13/18
Domestic Patent References:
| WO2021233737A1 | 2021-11-25 |
Foreign References:
| KR20140084569A | 2014-07-07 | |||
| JP2012027450A | 2012-02-09 | |||
| JP2016184136A | 2016-10-20 | |||
| JP2019066586A | 2019-04-25 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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