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Patent Searching and Data


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 (15-3 Konan 2-chome, Minato-k, Tokyo 90, 〒1086290, JP)
Application Number:
JP2017/041637
Publication Date:
May 23, 2019
Filing Date:
November 20, 2017
Export Citation:
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Assignee:
NIKON CORPORATION (15-3, Konan 2-chome Minato-k, Tokyo 90, 〒1086290, JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
JP2015197655A2015-11-09
JP2016139125A2016-08-04
JP2017173680A2017-09-28
JPH02256011A1990-10-16
JPH0329912A1991-02-07
JP2007086307A2007-04-05
JPH10268194A1998-10-09
JP2006251529A2006-09-21
JP2018005165A2018-01-11
JPS61169808A1986-07-31
Attorney, Agent or Firm:
INOUE & CO. et al. (2F Shinsei Bldg, 7-6 Taito 4-chome, Taito-k, Tokyo 16, 〒1100016, JP)
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