Patent ID: 8363035

Claim:
An illumination device comprising: Illumination light sources emitting illumination light; a light guide plate that has a plurality of light incident faces including first and second light incident faces, and the light guide plate has a light emitting face through which the illumination light exits from the light guide plate, the light guide plate having a plate-shaped body; a plurality of position detecting beam sources that include a first position detecting beam source emitting first detection light and a second position detecting, beam source emitting second detection light and, a wiring substrate that has a first substrate face facing the first light incident face and a second substrate face facing the second light incident face, wherein the illumination light sources and the first position detecting beam source are mounted on the first substrate face, the second position detecting beam source is mounted on the second substrate face, the illumination light and the first detection light enter the light guide plate through the first light incident, and the second detection light enters the light guide plate through, the second light incident face.