Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND MANUFACTURING METHOD FOR VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/017727
Kind Code:
A1
Abstract:
The variable power optical system according to the present invention has: a first lens group (G1) that is arranged closest to the object side; a first focusing lens group (Ga) that is arranged closer to the image side than the first lens group; a second focusing lens group (Gb) that is arranged closer to the image side than the first focusing lens group; and a rear lens group (Gr) that is arranged closer to the image side than the second focusing lens group. When the power is varied, the first lens group moves, and the spacing between the first lens group and the first focusing lens group, the spacing between the first focusing lens group and the second focusing lens group, and the spacing between the second focusing lens group and the rear lens group change, and when focusing, the first focusing lens group and the second focusing lens group move on the optical axis on differing movement trajectories, and satisfy a predetermined conditional formula.
Inventors:
YAMAMOTO HIROSHI (JP)
Application Number:
PCT/JP2015/071583
Publication Date:
February 04, 2016
Filing Date:
July 30, 2015
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JP2014026074A | 2014-02-06 | |||
| JP2012133116A | 2012-07-12 | |||
| JP2010026407A | 2010-02-04 | |||
| JP2013044815A | 2013-03-04 | |||
| JP2013200543A | 2013-10-03 | |||
| JPH07306363A | 1995-11-21 | |||
| JP2014102462A | 2014-06-05 | |||
| JPH06175023A | 1994-06-24 | |||
| JP2015118127A | 2015-06-25 |
Other References:
See also references of EP 3176625A4
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
Yoshio Inoue (JP)
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