Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND PRODUCTION METHOD FOR VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/025015
Kind Code:
A1
Abstract:
Provided are a variable magnification optical system, an optical device, and a production method for the variable magnification optical system, which suppress aberration fluctuation when changing magnification and have good optical properties from the wide-angle end state to the telescopic end state, as a result of: having, in order from the object side, a first lens group (G1) having positive refraction, a second lens group (G2) having negative refraction, a third lens group (G3) having positive refraction, and a fourth lens group (G4) having positive refraction; the first lens group (G1) having a fixed position in the optical axis direction when the magnification is changed from the wide-angle end to the telescopic end; at least the second lens group (G2) and the third lens group (G3) moving in the optical axis direction so as to increase the interval between the first lens group (G1) and the second lens group (G2) and decrease the interval between the second lens group (G2) and the third lens group (G3); at least one section of the fourth lens group (G4) moving from the first lens group (G1) so as to include a component in the direction orthogonal to the optical axis, as a vibration-resistant lens group; and fulfilling a prescribed conditional expression.
Inventors:
YAMAGUCHI SATOSHI (JP)
TANAKA ISSEI (JP)
TANAKA ISSEI (JP)
Application Number:
PCT/JP2013/071660
Publication Date:
February 13, 2014
Filing Date:
August 09, 2013
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B1/11; G02B15/167; G02B13/18
Domestic Patent References:
| WO2006030848A1 | 2006-03-23 |
Foreign References:
| JP2012058620A | 2012-03-22 | |||
| US20120062993A1 | 2012-03-15 | |||
| JP2011197302A | 2011-10-06 | |||
| US20110228407A1 | 2011-09-22 | |||
| JP2000284174A | 2000-10-13 | |||
| JP2012118097A | 2012-06-21 | |||
| JP2009192996A | 2009-08-27 | |||
| JP2011113052A | 2011-06-09 | |||
| JP2012093548A | 2012-05-17 | |||
| JP2011158599A | 2011-08-18 | |||
| JP2013156502A | 2013-08-15 | |||
| JP2008070450A | 2008-03-27 |
Other References:
See also references of EP 2884322A4
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
Yoshio Inoue (JP)
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