Title:
VARIABLE-MAGNIFICATION OPTICAL SYSTEM, OPTICAL APPARATUS, AND METHOD FOR MANUFACTURING VARIABLE-MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/264542
Kind Code:
A1
Abstract:
This variable-magnification optical system (ZL) comprises, in order along an optical axis from the object side, a first lens group (G1) that has a positive refractive power, a second lens group (G2) that has a negative refractive power, a third lens group (G3) that has a positive refractive power, a fourth lens group (G4) that has a negative refractive power, and a fifth lens group (G5) that has a negative refractive power. The distances between adjacent lens groups change during magnification. The fourth lens group (G4) is a focusing lens group that moves along the optical axis during focusing. The following conditional expression is satisfied: 0.11 < f4 / f5 < 0.70, where f4 is the focal length of the fourth lens group (G4) and f5 is the focal length of the fifth lens group (G5).
Inventors:
SASHIMA TOMOYUKI (JP)
YOKOI NORIKAZU (JP)
ISHIKAWA TAKAHIRO (JP)
YOKOI NORIKAZU (JP)
ISHIKAWA TAKAHIRO (JP)
Application Number:
PCT/JP2022/009426
Publication Date:
December 22, 2022
Filing Date:
March 04, 2022
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Domestic Patent References:
WO2018092295A1 | 2018-05-24 |
Foreign References:
JP2020122823A | 2020-08-13 | |||
JP2015227979A | 2015-12-17 | |||
JP2015018124A | 2015-01-29 | |||
JP2020086304A | 2020-06-04 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Download PDF:
Previous Patent: METHOD FOR PRODUCING COPPER MICROPARTICLES
Next Patent: MOUNTED COMPONENT, AND MOUNTING BOARD
Next Patent: MOUNTED COMPONENT, AND MOUNTING BOARD