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Laser image display apparatus

  • US 7,399,084 B2
  • Filed: 04/06/2005
  • Issued: 07/15/2008
  • Est. Priority Date: 04/09/2004
  • Status: Expired due to Fees
First Claim
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1. A laser image display apparatus comprising:

  • a laser light source;

    a light diffuser containing light diffusing elements, the light diffusing elements moving, swaying or oscillating;

    an illumination optical system which irradiates rays of light from the laser light source to the light diffuser;

    a spatial light modulator which is arranged near the light diffuser and irradiated by rays of light diffused by the light diffuser to produce image; and

    a projection lens which projects to a predetermined plane in space an image produced by the spatial light modulator,wherein a light diffusing angle θ

    of the light diffuser, a pitch P of transmission irregularity generated in the light scattering means, a numerical aperture NA of the illumination optical system, and a distance L between the spatial light modulator and the light diffuser have a relationship of P<



    tan(θ

    /2+Sin

    1
    (NA))×

    L.

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