Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, IMAGING DEVICE, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/192750
Kind Code:
A1
Abstract:
Provided is a variable magnification optical system having, in sequence from the object side along the optical axis, 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). The gap between the first lens group (G1) and the second lens group (G2), the gap between the second lens group (G2) and the third lens group (G3), and the gap between the third lens group (G3) and the fourth lens group (G4) vary when the magnification is varied from the wide-angle end state to the telephoto state. The third lens group (G3) comprises, in sequence from the object side along the optical axis, a lens group (3a) having a positive refractive power, an aperture (S), and a lens group (3b) having a positive refractive power. A lens group having a negative refractive power within the lens group (3b) is used as a vibration reduction lens group and moved so as to include a component in a direction orthogonal to the optical axis, whereby image plane correction is performed when image blurring occurs, and a predetermined condition formula is satisfied. A high-performance variable magnification optical system which has a small size, a small aberration fluctuation, and a sufficient brightness even in the telephoto state is thereby provided. Also provided are an imaging device and a method for manufacturing the variable magnification optical system.
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Inventors:
YAMAMOTO HIROSHI (JP)
SHIBATA SATORU (JP)
SHIBATA SATORU (JP)
Application Number:
PCT/JP2014/063986
Publication Date:
December 04, 2014
Filing Date:
May 27, 2014
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18; G03B5/00
Foreign References:
| JP2007264390A | 2007-10-11 | |||
| JP2007264173A | 2007-10-11 | |||
| JPH05224125A | 1993-09-03 | |||
| JPH0496012A | 1992-03-27 | |||
| JP2004333770A | 2004-11-25 | |||
| JP2007248952A | 2007-09-27 | |||
| JP2010113179A | 2010-05-20 |
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
Yoshio Inoue (JP)
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