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Patent Searching and Data


Title:
VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE, AND PRODUCTION METHOD FOR VARIABLE MAGNIFICATION OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/069447
Kind Code:
A1
Abstract:
Provided is a variable magnification optical system having, in order from the object side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; and a fifth lens group. The variable magnification optical system is compact, has high optical performance, and has a high magnification ratio as a result of the interval between the first lens group and the second lens group, the interval between the second lens group and the third lens group, the interval between the third lens group and the fourth lens group, and the interval between the fourth lens group and the fifth lens group changing when magnification is changed from a wide-angle end state to a telescopic end state, and a prescribed formula is fulfilled. Also provided are an optical device and a production method for the variable magnification optical system.

Inventors:
SASHIMA TOMOYUKI (JP)
OBAMA AKIHIKO (JP)
Application Number:
PCT/JP2013/079238
Publication Date:
May 08, 2014
Filing Date:
October 29, 2013
Export Citation:
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Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
JPH11271614A1999-10-08
JP2004264343A2004-09-24
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
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