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Surface light source device

  • US 5,134,549 A
  • Filed: 03/11/1991
  • Issued: 07/28/1992
  • Est. Priority Date: 06/19/1990
  • Status: Expired due to Term
First Claim
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1. A surface light source device comprising:

  • a linear light source,a light transmitting member having an end surface of incidence located proximate said light source,a diffusing plate disposed on a front surface of said light transmitting member, anda reflecting plate,wherein patterns formed as portions having diffusing functions are disposed on a rear surface of said light transmitting member, andwherein said portions having diffusing functions are sparse in area at a portion proximate a center of the end surface of incidence and said portions become progressively denser in area as the portions are farther from the center of the end surface of incidence.

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