Title:
VARIABLE-MAGNIFICATION OPTICAL SYSTEM, OPTICAL INSTRUMENT, AND METHOD FOR MANUFACTURING VARIABLE-MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/137820
Kind Code:
A1
Abstract:
A variable-magnification optical system (ZL) comprises: a first lens group (G1) having a positive refractive power; and a rear group (GR) including a plurality of lens groups. When changing the magnification, the gap between each adjacent pair of lens groups changes. The plurality of lens groups in the rear group (GR) include a second lens group (G2) having a positive refractive power and disposed nearest to the object side in the rear group (GR). The variable-magnification optical system (ZL) satisfies the following conditional expression: 0.15 < f2 / f1 < 0.80, where f1 is the focal length of the first lens group (G1), and f2 is the focal length of the second lens group (G2).
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Inventors:
OHTAKE FUMIAKI (JP)
Application Number:
PCT/JP2021/040485
Publication Date:
June 30, 2022
Filing Date:
November 04, 2021
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/16; G02B13/18; G02B21/20; H04N5/225
Foreign References:
| JPH08179215A | 1996-07-12 | |||
| JPH10221601A | 1998-08-21 | |||
| JPH0588085A | 1993-04-09 | |||
| JPH11326764A | 1999-11-26 | |||
| JP2002365551A | 2002-12-18 | |||
| JPH08211289A | 1996-08-20 | |||
| JPH11223771A | 1999-08-17 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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