Title:
OPTICAL SYSTEM, OPTICAL APPARATUS, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/127560
Kind Code:
A1
Abstract:
This optical system, comprising a front group, an aperture diaphragm, and a rear group in the stated order from the object side, the front group having at least three negative lenses and at least one positive lens in the stated order from the object side, and the rear group having at least four lenses, is configured so as to satisfy all of the following conditional expressions: 8.90 <ΣT1/f < 18.00, 2.00 < (-f12)/f > 4.20, and 160.00° < 2ω, where ΣT1 is the thickness of the front group on the optical axis thereof, f is the focal length of the optical system, f12 is the focal length of the lens arranged second from the object side in the front group, and 2ω is the total angle of view of the optical system.
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| WO/2019/101052 | OPTICAL IMAGING LENS |
Inventors:
KURASHIGE TAKAMICHI (JP)
Application Number:
PCT/JP2022/046479
Publication Date:
July 06, 2023
Filing Date:
December 16, 2022
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/06; G02B13/04
Domestic Patent References:
| WO2021065319A1 | 2021-04-08 | |||
| WO2018097287A1 | 2018-05-31 | |||
| WO2018189818A1 | 2018-10-18 | |||
| WO2019235498A1 | 2019-12-12 |
Foreign References:
| JP2016191790A | 2016-11-10 | |||
| JP2007155977A | 2007-06-21 | |||
| JP2007155976A | 2007-06-21 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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