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Light guide plate and surface light source device

  • US 8,882,326 B2
  • Filed: 06/25/2013
  • Issued: 11/11/2014
  • Est. Priority Date: 06/25/2012
  • Status: Active Grant
First Claim
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1. A light guide plate comprising:

  • an incident surface on which light outputted from a plurality of point light sources is incident;

    an outgoing surface from which light incident from the incident surface is outputted, the outgoing surface being orthogonal to the incident surface; and

    a reflection-and-propagation surface at which the light incident from the incident surface is reflected so as to be propagated toward the outgoing surface, the reflection-and-propagation surface being opposed to the outgoing surface and being orthogonal to the incident surface, whereina plurality of prism grooves extending parallel to the incident surface are formed in the reflection-and-propagation surface,a flat surface portion is formed in a propagation region of the outgoing surface adjacent to the incident surface, anda plurality of prism protrusions extending orthogonal to the incident surface are formed in a diffusion-and-propagation region of the outgoing surface adjacent to the propagation region, each of the prism protrusions including a protrusion having a curved portion at its upper end.

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