Title:
VARIABLE POWER OPTICAL ASSEMBLY, OPTICAL DEVICE, AND VARIABLE POWER OPTICAL ASSEMBLY FABRICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2014/077120
Kind Code:
A1
Abstract:
A variable power optical assembly comprises, in order from the object side, a positive first lens group (G1), a negative second lens group (G2), a positive third lens group (G3), a fourth lens group (G4), a fifth lens group (G5), and a sixth lens group (G6). When the magnification is changed from a wide angle end state to a telephoto end state, the distance between the first lens group (G1) and the second lens group (G2), the distance between the second lens group (G2) and the third lens group (G3), the distance between the third lens group (G3) and the fourth lens group (G4), the distance between the fourth lens group (G4) and the fifth lens group (G5), and the distance between the fifth lens group (G5) and the sixth lens group (G6) change. Prescribed conditional formulae are satisfied. Thus, a variable power optical assembly which has high variable power, is miniaturized, and has high optical performance, as well as an optical device and a variable power optical assembly fabrication method, can be provided.
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Inventors:
OBAMA AKIHIKO (JP)
SASHIMA TOMOYUKI (JP)
SASHIMA TOMOYUKI (JP)
Application Number:
PCT/JP2013/079241
Publication Date:
May 22, 2014
Filing Date:
October 29, 2013
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B15/20; G02B13/18; G03B5/00
Foreign References:
| JP2006251468A | 2006-09-21 | |||
| JPH10268194A | 1998-10-09 | |||
| JP2003287680A | 2003-10-10 | |||
| JP2007292994A | 2007-11-08 |
Other References:
See also references of EP 2921897A4
Attorney, Agent or Firm:
INOUE, Yoshio et al. (JP)
Yoshio Inoue (JP)
Yoshio Inoue (JP)
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