Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/031256
Kind Code:
A1
Abstract:
A variable magnification optical system comprising a first lens group (G1) having positive refractive power, a front-side lens group (GX), an intermediate lens group (GM) having positive refractive power, and a rear-side lens group (GR), which are arranged in order from the object side, wherein: the front-side lens group (GX) is composed of one or more lens groups and has a negative lens group; at least part of the intermediate lens group (GM) is a focusing lens group (GF); the rear-side lens group (GR) is composed of one or more lens groups; and when the magnification is changed, the first lens group (G1) is moved with respect to an image surface, the distance between the first lens group (G1) and the front-side lens group (GX) is changed, the distance between the front-side lens group (GX) and the intermediate lens group (GM) is changed, and the distance between the intermediate lens group (GM) and the rear-side lens group (GR) is changed.
Inventors:
SHIBATA SATORU (JP)
SASHIMA TOMOYUKI (JP)
SASHIMA TOMOYUKI (JP)
Application Number:
PCT/JP2015/004375
Publication Date:
March 03, 2016
Filing Date:
August 28, 2015
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JP2014085494A | 2014-05-12 | |||
| JP2014098795A | 2014-05-29 | |||
| JP2013218299A | 2013-10-24 | |||
| JP2013182022A | 2013-09-12 | |||
| JP2014089288A | 2014-05-15 | |||
| JP2014066944A | 2014-04-17 | |||
| JP2014137408A | 2014-07-28 | |||
| JP2013101316A | 2013-05-23 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Shogo Onishi (JP)
Shogo Onishi (JP)
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