Title:
OPTICAL SYSTEM, OPTICAL APPARATUS, AND METHOD FOR MANUFACTURING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2023/190222
Kind Code:
A1
Abstract:
This optical system comprising a first lens group, an aperture diaphragm, and a rear group in the stated order from an object side, the rear group having a first doublet lens comprising a positive lens and a negative lens, is configured so as to satisfy all of the following conditions: 0.350 < Bf/y < 0.700, 1.350 < TL/y < 2.000, and 0.050 < Np1 – Nn1 < 0.400, where Bf is the back focal distance as an air conversion length, y is the maximum image height, TL is the distance from the lens surface closest to the object to the image plane, NP1 is the refractive index of the positive lens constituting the first doublet lens, and Nn1 is the refractive index of the negative lens constituting the first doublet lens.
Inventors:
MAKIDA AYUMU (JP)
TOSHI TAEKO (JP)
TOSHI TAEKO (JP)
Application Number:
PCT/JP2023/011961
Publication Date:
October 05, 2023
Filing Date:
March 24, 2023
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B13/00; G02B13/18
Domestic Patent References:
| WO2021166492A1 | 2021-08-26 | |||
| WO2013069264A1 | 2013-05-16 | |||
| WO2022244840A1 | 2022-11-24 |
Foreign References:
| JP2017054078A | 2017-03-16 | |||
| JPS5983121A | 1984-05-14 | |||
| JP2013137377A | 2013-07-11 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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