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Title:
ZOOM LENS, OPTICAL INSTRUMENT AND METHOD FOR MANUFACTURING ZOOM LENS
Document Type and Number:
WIPO Patent Application WO/2017/099244
Kind Code:
A1
Abstract:
This zoom lens is configured to have: a first lens group (G1) having a negative refractive power; a second lens group (G2) having a positive refractive power; a third lens group (G3) having a negative refractive power; and a fourth lens group (G4) having a positive refractive power, the lens groups being aligned along the optical axis in this order from the object side, and the zoom lens satisfying the following conditional expression . 1.60 < (-f1)/fw < 2.50 where , f1 is a focal distance of the first lens group , and fw is a focal distance of the entire zoom lens at the wide-angle end.

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Inventors:
KOIDA KEIGO (JP)
Application Number:
PCT/JP2016/086815
Publication Date:
June 15, 2017
Filing Date:
December 09, 2016
Export Citation:
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Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
WO2014087855A12014-06-12
Foreign References:
JP2015121768A2015-07-02
JP2012226307A2012-11-15
JP2014215500A2014-11-17
JP2011059498A2011-03-24
JP2004354980A2004-12-16
JP2014026169A2014-02-06
JPH01216310A1989-08-30
JP2017037163A2017-02-16
JP2016161889A2016-09-05
JP2016133764A2016-07-25
JP2016142979A2016-08-08
JP2016075741A2016-05-12
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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