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Surface light source and light guide used therefor

  • US 20050237768A1
  • Filed: 08/15/2003
  • Published: 10/27/2005
  • Est. Priority Date: 08/15/2002
  • Status: Active Grant
First Claim
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1. A plate-shaped light guide for a planar light source device, which guides light emitted from a primary light source, the light guide comprising:

  • a light incident face which the light emitted from the primary light source enters and a light emitting face from which the guided light is emitted, wherein the light emitting face is a finely uneven surface, an average slant angle θ

    a of the finely uneven surface is in a range of 0.3°

    to 30°

    , and a ten-point average roughness Rz is in a range of 0.7 μ

    m to 10 μ

    m.

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