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Title:
ILLUMINATION LIGHT SOURCE AND IMAGE DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP2009054325
Kind Code:
A
Abstract:

To provide an illumination light source employing a coherent light source, which suppresses the influence of speckle in a simplified arrangement.

The illumination light source comprises: a surface emitting laser 2 in which a plurality of coherent light emitting points are arranged in one-dimensional array; a beam shaping optical system 4 that shapes a light beam so that a diameter of a light emitted from the surface emitting laser 2 in a direction perpendicular to a direction of the light emitting point array is larger than a diameter in the direction of the light emitting point array, and that an intensity distribution of the light emitted from each of the light emitting points is uniform; an optical fiber 6; and a focusing optical system 5 in which a magnification is set such that a light emitted from the beam shaping optical system 4 is coupled to the optical fiber 6, based on the maximum diameter of the light emitted from the beam shaping optical system 4.


Inventors:
MURASE REINA
INOUE YOKO
SASAGAWA TOMOHIRO
Application Number:
JP2007217508A
Publication Date:
March 12, 2009
Filing Date:
August 23, 2007
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
F21V8/00; G02B19/00; H01S5/02; F21Y101/02
Domestic Patent References:
JP2008242371A2008-10-09
JP2005331906A2005-12-02
JP2002184206A2002-06-28
JP2000121836A2000-04-28
JP2001023422A2001-01-26
JP2001356247A2001-12-26
JP2004144936A2004-05-20
JPH11326826A1999-11-26
JP2003131165A2003-05-08
JPH1164789A1999-03-05
Foreign References:
WO2006011571A12006-02-02
Attorney, Agent or Firm:
Hiroaki Sakai