Patent ID: 7210815

Claim:
An illumination apparatus comprising: a first light source configured to emit a diffused light; a second light source configured to emit a diffused light; and an optical device including; a first incidence plane configured to enter rays emitted from the first light source; a second incidence plane configured to enter rays emitted from the second light source, the rays entering the first incidence plane being reflected by the second incidence plane, the rays entering the second incidence plane being reflected by the first incidence plane; and an emission plane configured to mix the rays reflected by the first and second incidence planes and to emit the mixed rays in a predetermined direction; wherein the first and second light sources have light-emitting surfaces which emit diffused light, and the light-emitting surfaces are disposed in a mutually parallel positional relation; and wherein the first and second light sources are mounted on the same substrate, and are parallel to each other with respect to the light-emitting surfaces.