VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR PRODUCING VARIABLE MAGNIFICATION OPTICAL SYSTEM

WIPO Patent Application WO/2016/104742

A1

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 arranged further toward the image side than a stop (S), 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 first lens group moves with respect to an object surface, 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.

UCHIDA KENSUKE (JP)
OBAMA AKIHIKO (JP)
YAMAMOTO HIROSHI (JP)
MATSUO TAKU (JP)

PCT/JP2015/086328

June 30, 2016

December 25, 2015

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NIKON CORP (JP)

G02B15/20

JPH11344672A	1999-12-14
JP2010054667A	2010-03-11
JP2009186983A	2009-08-20
JP2004212512A	2004-07-29
JPH10197794A	1998-07-31

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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