Title:
ZOOM LENS, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING ZOOM LENS
Document Type and Number:
WIPO Patent Application WO/2017/131223
Kind Code:
A1
Abstract:
A zoom lens configured having, in order along the optical axis thereof from an object side, a first lens group (G1) having a positive refractive index, a second lens group (G2) having a negative refractive index, a third lens group (G3) having a positive refractive index, a fourth lens group (G4) having a negative refractive index, and a fifth lens group (G5) having a positive refractive index, the interval between adjacent lens groups changing and the first lens group (G1), the second lens group (G2), the third lens group (G3), and the fourth lens group (G4) moving during zooming from a wide-angle-end state to a telephoto-end state, and the conditional expressions below being satisfied. 1.80 < f1/(fw × ft)1/2 < 2.60 and 0.75 < -f4/(fw × ft)1/2 < 1.20, where f1 is the focal length of the first lens group, f4 is the focal length of the fourth lens group, fw is the focal length in the wide-angle-end state of the zoom lens, and ft is the focal length in the telephoto-end state of the zoom lens.
Inventors:
ISHIKAWA TAKAHIRO (JP)
Application Number:
PCT/JP2017/003102
Publication Date:
August 03, 2017
Filing Date:
January 30, 2017
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
| WO2012101958A1 | 2012-08-02 | |||
| WO2014115470A1 | 2014-07-31 |
Foreign References:
| JP2011232542A | 2011-11-17 | |||
| JP2011232543A | 2011-11-17 | |||
| JP2013044755A | 2013-03-04 | |||
| JP2009282398A | 2009-12-03 | |||
| JP2009115958A | 2009-05-28 | |||
| JP2012159579A | 2012-08-23 | |||
| JP2007279587A | 2007-10-25 | |||
| JP2015102691A | 2015-06-04 | |||
| JP2008304708A | 2008-12-18 | |||
| JP2001091833A | 2001-04-06 | |||
| JP2015084039A | 2015-04-30 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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