Title:
VARIABLE-POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR PRODUCING VARIABLE-POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2013/129487
Kind Code:
A1
Abstract:
Provided is a variable-power optical system having, in order from the object side, a first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, and a fourth lens group (G4) having a positive refractive power, wherein: when the magnification is varied between a wide-angle-end state and a telescopic-end state, the interval between the first lens group (G1) and the second lens group (G2) changes, the interval between the second lens group (G2) and the third lens group (G3) changes, and the interval between the third lens group (G3) and the fourth lens group (G4) changes; the third lens group (G3) has, in order from the object side, a first section group (G31) having a positive refractive power and a second section group (G32); the second section group (G32) moves so as to include a component in a direction perpendicular to the optical axis; and a prescribed conditional expression is satisfied. As a result, the variable-power optical system is compact, has high power-variability and a wide-angle view, and exhibits favorable optical performance and an anti-vibration function. Further provided are an optical device and a method for producing a variable-power optical system.
Inventors:
YAMASHITA MASASHI (JP)
Application Number:
PCT/JP2013/055173
Publication Date:
September 06, 2013
Filing Date:
February 27, 2013
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20
Foreign References:
| JP2009150970A | 2009-07-09 | |||
| JP2009009104A | 2009-01-15 | |||
| JP2008015251A | 2008-01-24 | |||
| JP2011186165A | 2011-09-22 | |||
| JP2011186159A | 2011-09-22 | |||
| JP2009128607A | 2009-06-11 | |||
| JP2009128606A | 2009-06-11 | |||
| JP2008033208A | 2008-02-14 | |||
| JP2007017533A | 2007-01-25 |
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
Yoshio Inoue (JP)
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Claims: