Title:
VARIABLE-POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE-POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/017725
Kind Code:
A1
Abstract:
The present invention has, in order from an object, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and at least one lens group G3, an interval between the first lens group G1 and the second lens group G2 changes and an interval between the second lens group G2 and the lens group G3 adjacent to the second lens group G2 on the image side thereof changes during power variation, the first lens group G1 has, in order from the object, a positive lens group G11 having a positive refractive power and a focusing lens group GF for moving along the optical axis during focusing, and the present invention satisfies a predetermined conditional expression. The present invention thereby provides a variable-power optical system provided with good optical performance during focusing, an optical device, and a method for manufacturing a variable-power optical system.
Inventors:
MACHIDA KOSUKE (JP)
Application Number:
PCT/JP2015/071581
Publication Date:
February 04, 2016
Filing Date:
July 30, 2015
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/16; G02B15/20
Foreign References:
| JP2001066501A | 2001-03-16 | |||
| JP2013068690A | 2013-04-18 | |||
| JPH07151974A | 1995-06-16 | |||
| JP2003161883A | 2003-06-06 | |||
| JP2010145831A | 2010-07-01 |
Other References:
See also references of EP 3176622A4
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
Yoshio Inoue (JP)
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