Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR PRODUCING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/104747
Kind Code:
A1
Abstract:
Provided is a variable magnification optical system comprising: a first lens group (G1) that is arranged closest to the object side and that has a positive refractive power; a negative lens group (G2) that is arranged further toward the image side than the first lens group and that has a negative refractive power; a positive lens group (G4) that is arranged further toward the image side than the negative lens group, that includes at least one lens which moves together with an aperture stop, and that has a positive refractive power; and a focusing group (G3) that is arranged between the negative lens group and the positive lens group. When varying magnification, the interval between the first lens group and the negative lens group changes and the interval between the negative lens group and the positive lens group changes. When focusing, the interval between the focusing group and a lens arranged in a position facing the object side of the focusing group changes, the interval between the focusing group and a lens arranged in a position facing the image side of the focusing group changes, and a predetermined conditional expression is satisfied.
Inventors:
UCHIDA KENSUKE (JP)
OBAMA AKIHIKO (JP)
YOKOI NORIKAZU (JP)
YAMAMOTO HIROSHI (JP)
MATSUO TAKU (JP)
OBAMA AKIHIKO (JP)
YOKOI NORIKAZU (JP)
YAMAMOTO HIROSHI (JP)
MATSUO TAKU (JP)
Application Number:
PCT/JP2015/086342
Publication Date:
June 30, 2016
Filing Date:
December 25, 2015
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Domestic Patent References:
| WO2013146758A1 | 2013-10-03 |
Foreign References:
| JP2012093548A | 2012-05-17 | |||
| JP2007240747A | 2007-09-20 | |||
| JPH06289298A | 1994-10-18 | |||
| JP2010145759A | 2010-07-01 | |||
| JPH10197794A | 1998-07-31 | |||
| JP2009075581A | 2009-04-09 | |||
| JP2011112832A | 2011-06-09 | |||
| JP2011232502A | 2011-11-17 | |||
| JP2011090185A | 2011-05-06 |
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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