Patent ID: 7181096

Claim:
A light waveguide comprised of a light transmitting material, said light waveguide comprising: a light introducing portion for introducing light coming from a light source; a light radiating surface for radiating the light introduced through said light introducing portion; a light transmitting surface which is opposed to said light radiating surface and through which at least a portion of external light incident from said light radiating surface is transmitted to the exterior; an irregular reflection portion provided on said light transmitting surface to change the reflection angle of light on said light transmitting surface; and a light separation portion provided on a surface in a region ranging from said light introducing portion to said light radiating surface and said light transmitting surface, said light separation portion having an absorption layer formed of a material having a refractive index lower than the refractive index of said light transmitting material and higher than the refractive index of a material in contact with said light transmitting surface.