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Patent Searching and Data


Title:
VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND METHOD FOR MANUFACTURING VARIABLE POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/162883
Kind Code:
A1
Abstract:
 This system has, arrayed in order from the object side along the optical axis, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, a fourth lens group (G4) having positive refractive power, and a fifth lens group (G5). When the power is varied, the spacing between the first lens group (G1) and the second lens group (G2), the spacing between the second lens group (G2) and the third lens group (G3), the spacing between the third lens group (G3) and the fourth lens group (G4), and the spacing between the fourth lens group (G4) and the fifth lens group (G5) changes. When the power is varied, the lens group closest to the image side is generally stationary with respect to the image plane (I), and when focusing, the third lens group (G3) moves along the optical axis, and satisfies the following conditional expression (1). 0.480 < f3/ft < 4.000 … (1)

Inventors:
OBAMA AKIHIKO (JP)
UCHIDA KENSUKE (JP)
Application Number:
PCT/JP2015/002101
Publication Date:
October 29, 2015
Filing Date:
April 16, 2015
Export Citation:
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Assignee:
NIKON CORP (JP)
International Classes:
G02B13/18; G02B15/20
Foreign References:
JP2008216667A2008-09-18
US20110222166A12011-09-15
US20110141576A12011-06-16
JPH0527172A1993-02-05
JPH08179214A1996-07-12
JP2010191334A2010-09-02
JP2013242518A2013-12-05
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Shogo Onishi (JP)
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