Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND MANUFACTURING METHOD OF VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/097717
Kind Code:
A1
Abstract:
This variable magnification optical system comprises multiple lens groups, and the intervals between the lens groups change during variable magnification. The multiple lens groups include an object-side focusing lens group which moves during focusing, and at least one image-side focusing lens group which is arranged on the image side of the object-side focusing lens group and which during focusing moves on a trajectory different from that of the object-side focusing lens group. By satisfying a prescribed conditional expression, the variable magnification optical system favorably suppresses aberration fluctuation when changing magnification from a wide-angle end state to a telephoto end state and aberration fluctuation when focusing from an object at infinity to an object at close range.
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2017/041637
Publication Date:
May 23, 2019
Filing Date:
November 20, 2017
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
JP2015197655A | 2015-11-09 | |||
JP2016139125A | 2016-08-04 | |||
JP2017173680A | 2017-09-28 | |||
JPH02256011A | 1990-10-16 | |||
JPH0329912A | 1991-02-07 | |||
JP2007086307A | 2007-04-05 | |||
JPH10268194A | 1998-10-09 | |||
JP2006251529A | 2006-09-21 | |||
JP2018005165A | 2018-01-11 | |||
JPS61169808A | 1986-07-31 |
Attorney, Agent or Firm:
INOUE & CO. et al. (JP)
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