Surface light source device
First Claim
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1. A surface light source device comprising:
- a light conducting member made of transparent material;
a linear light source disposed in the vicinity of at least one of edge surfaces of said light conducting member;
a diffusion plate disposed on a light emitting surface side of said light conducting member;
a reflective member disposed on an opposite side surface of said light emitting surface of said light conducting member; and
a light diffusing material being applied on the opposite side surface of the light conducting member so as to cover all over the opposite side surface, said light conducting member comprising a multiplicity of elements formed on said opposite side surface of said light conducting member, elements further away from the light source diffusing more light from the light source than elements closer to the light source.
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Abstract
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.
194 Citations
10 Claims
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1. A surface light source device comprising:
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a light conducting member made of transparent material; a linear light source disposed in the vicinity of at least one of edge surfaces of said light conducting member; a diffusion plate disposed on a light emitting surface side of said light conducting member; a reflective member disposed on an opposite side surface of said light emitting surface of said light conducting member; and a light diffusing material being applied on the opposite side surface of the light conducting member so as to cover all over the opposite side surface, said light conducting member comprising a multiplicity of elements formed on said opposite side surface of said light conducting member, elements further away from the light source diffusing more light from the light source than elements closer to the light source. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A surface light source device comprising:
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a light conducting member made of transparent material; linear light sources disposed in the vicinity of two edge surfaces of said light conducting member which are opposite to each other; 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 a 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 said light conducting member, and top portions of said concave portions being directed toward to a direction of a light source closer to the relevant concave portions, and a light diffusing material filling said concave portions. - View Dependent Claims (9, 10)
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Specification