Surface light source device
First Claim
Patent Images
1. A surface light source device comprising:
- a light-conducting member, a linear light source disposed adjacent to an edge surface of incidence of said light-conducting member, a diffusion plate disposed along a front surface of said light-conducting member, and a reflective surface disposed along a rear exterior surface of said light-conducting member opposite said diffusion plate, said rear exterior surface comprising a plurality of depressions formed therein, said rear exterior surface comprising rough portions only in said depressions.
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Abstract
A surface light source device which comprises a light-conducting member consisting of a sheet of transparent material, a linear light source disposed adjacent to an edge surface of the light-conducting member, a diffusion plate disposed on a front surface of the light-conducting member and a reflective plate disposed on a rear side of the light-conducting member. The rear surface of the light-conducting member has depressions or projections. These depressions or projections have rough surfaces. By selecting the shape of the depressions or projections, and controlling the roughness of the rough surfaces, an enhanced uniform brightness distribution is provided.
277 Citations
30 Claims
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1. A surface light source device comprising:
- a light-conducting member, a linear light source disposed adjacent to an edge surface of incidence of said light-conducting member, a diffusion plate disposed along a front surface of said light-conducting member, and a reflective surface disposed along a rear exterior surface of said light-conducting member opposite said diffusion plate, said rear exterior surface comprising a plurality of depressions formed therein, said rear exterior surface comprising rough portions only in said depressions.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 22, 23, 25, 26, 27, 28)
- 12. A surface light source device comprising a linear light source, a light-conducting member having an edge surface of incidence disposed adjacent to said light source, a diffusion plate disposed on a front surface of said light-conducting member, and a reflective surface disposed on a surface of said light-conducting member opposite to said diffusion plate, said device comprising a multiplicity of corrugations formed on said surface of said light-conducting member close to said reflective surface, said corrugations having either curved surfaces or a combination of curved and planar surfaces continuously formed in all directions, and said corrugations having rough surfaces.
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18. A surface light source device comprising a linear light source, a light-conducting member having an edge surface of incidence disposed adjacent to said light source, a light-reflective member placed on a surface of said light-conducting member opposite to said edge surface of incidence, a diffusion plate disposed on an emitting surface of said light-conducting member, and a reflective surface disposed on a surface of said light-conducting member, opposite said diffusion plate said device further comprising corrugations formed on said reflective surface of said light-conducting member, said corrugations having one of curved surfaces and a combination of curved and planar surfaces continuously formed in all directions, said corrugations having rough surfaces and said corrugations having an increased height with the lowest ones lying close to said edge surface of incidence, and again becoming lower toward said light-reflective member.
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19. A surface light source device comprising a linear light source, a light-conducting member having an edge surface of incidence disposed adjacent to said light source, a light-reflective member placed on a surface of said light-conducting member opposite to said edge surface of incidence, a diffusion plate disposed on an emitting surface of said light-conducting member, and a reflective surface disposed on a surface of said light-conducting member, opposite to said diffusion plate said further device comprising corrugations formed on said reflective surface of said light-conducting member, said corrugations having one of curved surfaces and a combination of curved and planar surfaces continuously formed in all directions, said corrugations having rough surfaces, and said corrugations having a decreased spacing with said corrugations having the largest spacing lying close to said edge surface of incidence, and said spacing becoming larger toward said light-reflective member.
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20. A surface light source device comprising a linear light source, a light-conducting member having an edge surface of incidence disposed adjacent to said light source, a light-reflective member placed on a surface of said light-conducting member opposite to said edge surface of incidence, a diffusion plate disposed on an emitting surface of said light-conducting member, and a reflective surface disposed on a surface of said light-conducting member opposite to said diffusion plate, said device further comprising corrugations formed on said reflective surface of said light-conducting member, said corrugations having rough surfaces, and the roughness of said rough surfaces becoming greater as said rough surfaces lie farther from said edge surface of incidence, and being smaller toward said light-reflective member.
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21. A surface light source device comprising a linear light source, a light-conducting member having an edge surface of incidence disposed adjacent to said light source, a light-reflective member placed on a surface of said light-conducting member opposite to said edge surface of incidence, a diffusion plate disposed on an emitting surface of said light-conducting member, and a reflective surface disposed on a surface of said light-conducting member opposite to said diffusion plate, said device further comprising corrugations formed on said reflective surface of said light-conducting member, said corrugations are varied by selecting and changing at least two factors from the group comprising height, spacing, incline between a crest and base of a waveform and roughness of rough surfaces.
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29. A surface light source device comprising:
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a transparent plate-like light conducting member; a linear light source disposed proximate a light incident edge surface of said light conducting member, a diffusion plate disposed along one exterior surface of said light conducting member, and a reflecting plate disposed at an opposite exterior surface of said light conducting member than the surface along which said diffusion plate is disposed, a plurality of concave surfaces and a plurality of convex surfaces alternatively formed on said opposite exterior surface, and wherein only said concave surfaces and said convex surfaces of said opposite exterior surface are formed as rough surfaces.
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30. A surface light source device comprising:
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a transparent plate-like light conducting member, a linear light source disposed proximate a light incident edge surface of said light conducting member, a diffusion plate disposed along one exterior surface of said light conducting member, and a reflecting plate disposed at an opposite exterior surface of said light conducting member than the surface along which said diffusion plate is disposed, one of a plurality of concave surfaces and a plurality of convex surfaces being formed on said opposite exterior surface, and wherein only said concave surfaces or said convex surfaces of said opposite exterior surface are formed as rough surfaces.
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Specification