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Light guide plate and surface light source using the light guide plate

  • US 5,999,685 A
  • Filed: 09/02/1997
  • Issued: 12/07/1999
  • Est. Priority Date: 02/07/1997
  • Status: Expired due to Term
First Claim
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1. A light guide plate, formed from a resin for emitting light, from a light source provided adjacent to at least one of its side end surfaces, from a light emission surface, comprising:

  • a first lens portion comprising a plurality of recessed or projected lenticular unit lenses formed from the same resin as that of the light guide plate on said light emission surface,the plurality of lenticular unit lenses in said first lens portion being triangular prism portions whose respective vertexes have an angle of 125°

    to 165° and

    being so arranged that their respective ridge lines are nearly parallel to each other.

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