Patent ID: 7360938

Claim:
A surface light-source device comprising: a rod-shaped light source; a first light guide member having a first emission surface for emitting light of said light source as planar light, said first light guide member having a first rear surface opposite to said first emission surface; a second light guide member having a second emission surface for emitting light of said light source as planar light, said second light guide member having a second rear surface opposite to said second emission surface, said first and second light guide members being disposed such that said first and second rear surfaces closely confront each other; a first groove formed in said first rear surface; a second grove formed in said second rear surface, said light source being contained in a space, which is formed by said first and second grooves, so as to be interposed therein; a first incline surface pair formed on said first rear surface, said first incline surface pair being symmetrical about a plane, which includes a central axis of said light source and is perpendicular to said first emission surface, and said first incline surface pair substantially having a V-shaped section wherein said first groove is disposed at a portion which is formed by said first incline surface pair so as to be convex relative to said first emission surface; a second incline surface pair formed on said second rear surface, said second incline surface pair being symmetrical about a plane, which includes the central axis of said light source and is perpendicular to said second emission surface, and said second incline surface pair substantially having a V-shaped section wherein said second groove is disposed at a portion which is formed by said second incline surface pair so as to be convex relative to said second emission surface; and a reflector member for reflecting the light of said light source, which has entered said first and second light guide members, toward said first and second emission surfaces, said reflector member being disposed in a space formed by said first incline surface pair and said second incline surface pair.