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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/2019/097716
Kind Code:
A1
Abstract:
This variable magnification optical system comprises, from the object side, a first lens group and multiple lens groups, and, during variable magnification, the interval between the first lens group and the multiple lens groups changes and the intervals between the lens groups of the multiple lens groups change. 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:
JP2017/041636
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:
JP2016139125A2016-08-04
JP2017129668A2017-07-27
JP2014102462A2014-06-05
JP2015118141A2015-06-25
JP2015215438A2015-12-03
JP2012083726A2012-04-26
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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