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Light source unit and projection type video display apparatus using the same

  • US 20050190307A1
  • Filed: 01/13/2005
  • Published: 09/01/2005
  • Est. Priority Date: 01/16/2004
  • Status: Active Grant
First Claim
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1. A light source unit for use in a projection type video display apparatus having a video display device for modulating light on the basis of a video signal and a projection lens for projecting output light emitted from said video display device upon a screen, comprising:

  • at least two arrayed light sources; and

    a focusing mirror in the form of a reflector disposed in correspondence with each of said light sources and having a shape of paraboloid or non-spherical form approximating the paraboloid, wherein when D represents an effective diameter of said reflector, f represents a focal distance of said mirror and Z represents a distance between a light emitter of said light source and an apex at a center of said mirror, said light source unit is so constructed as to satisfy
    D<

    4×

    f
    or D<

    4×

    Z.

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