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Patent Searching and Data


Title:
ZOOM LENS FOR PROJECTION, AND PROJECTION-TYPE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/076961
Kind Code:
A1
Abstract:
[Problem] To provide a zoom lens for projection in which the numerical aperture is fixed across the entire magnification range, and the entire length and the lens diameter of the lens group furthest to the enlargement side is reduced. [Solution] A zoom lens for projection comprising a first lens group (G1) which is arranged furthest to the enlargement side, is fixed during changes in magnification and has positive refractive power, at least two mobile lens groups (G2-G4) which are arranged further to the reduction side than the first lens group (G1) and which move during changes in magnification, and an aperture stop (St) which is arranged between adjacent mobile lens groups or within one mobile lens group, wherein the numerical aperture is set so as to remain fixed for the entire magnification range.

Inventors:
NAGATOSHI YUKIKO (JP)
Application Number:
PCT/JP2013/006718
Publication Date:
May 22, 2014
Filing Date:
November 15, 2013
Export Citation:
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Assignee:
FUJIFILM CORP (JP)
International Classes:
G02B15/20; G03B21/14
Foreign References:
JP2012008344A2012-01-12
JP2011107693A2011-06-02
JP2009128683A2009-06-11
JP2011053295A2011-03-17
JP2003241096A2003-08-27
JP2003241095A2003-08-27
JP2003202497A2003-07-18
JPH08234105A1996-09-13
JP2013160997A2013-08-19
JP2014038237A2014-02-27
Attorney, Agent or Firm:
YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)
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