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A surface light source device using a light conducting member, in which a multiplicity of concave portions are formed on an opposite surface of a light emitting surface of the light conducting member and the concave portions are arranged to have specific shapes to obtain a bright surface light sourc

A surface light source device using a light conducting member, in which a multiplicity of concave portions are formed on an opposite surface of a light emitting surface of the light conducting member and the concave portions are arranged to have specific shapes to obtain a bright surface light source with a uniform brightness. A light diffusing material is fulfilled within the concave portions of the light conducting member so that a more uniform brightness can be obtained in an easy manner.

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A surface light source device comprising a light conducting member made of transparent material, a linear light source disposed in the vicinity of one of edge surfaces of said light conducting member, a diffusion plate disposed on a light emitting surface side of said light conducting member, and a

A surface light source device comprising a light conducting member made of transparent material, a linear light source disposed in the vicinity of one of edge surfaces of said light conducting member, a diffusion plate disposed on a light emitting surface side of said light conducting member, and a reflective member disposed on an opposite side surface of said light emitting surface of said light conducting member, said light conducting member comprising a multiplicity of conical or polygonal pyramid-shaped concave portions formed on said opposite side surface of the light conducting member and said concave portions satisfy the following conditions: 80°≤a90°>b90°-q wherein the reference symbol abqa when a refractive index of said light conducting member is represented by n: qsin-1(1/n).