Illumination device, coordinate inputting device, electro-optical device, and electronic apparatus

1. 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.

2. An illumination device comprising:

Illumination light sources emitting illumination light; a light guide plate that has a plurality of light incident faces including first, second, and third light incident faces; a plurality of position detecting beam sources that include a first position detecting beam source emitting first detection light, a second position detecting beam source emitting second detection light, and a third position detecting beam source emitting third detection light; and a wiring substrate that has a first substrate face facing the first light incident face, a second substrate face facing the second light incident face, and a third substrate face facing the third 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 third position detecting beam source is mounted on the third substrate face, the illumination light and the first detection light enter the light guide plate through the first incident face, the second detection light enters the light guide plate through the second light incident face, and the third detection light enters the light guide plate through the third light incident face.

3. The illumination device according to claim 1 ,

the first detection light and the second detection light exiting from the light emitting face.

4. The illumination device according claim 2 ,

the third detection light exiting from the light emitting face.

5. The light illumination device according to claim 1 ,

the first light incident face being positioned at a first side of the light guide plate, the second light incident face being positioned at a second side, which is different from the first side, of the light guide plate.

6. The illumination device according to claim 1 ,

the wiring substrate covering at least a part of an end face of the light guide plate.

7. An illumination device comprising:

Illumination light sources emitting illumination light; a light guide plate that has a plurality of light incident faces including first, second, third, and fourth light incident faces; a plurality of position detecting beam sources that include a first position detecting beam source emitting first detection light, a second position detecting beam source emitting second detection light, a third position detecting beam source emitting third detection light and a fourth position detecting beam source emitting fourth detection light; and a wiring substrate that has a first substrate face facing the first light incident face, a second substrate face facing the second light incident face, a third substrate face facing the third light incident face, and a fourth substrate face facing the fourth 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 third position detecting beam source is mounted on the third substrate face, the fourth position detecting beam source is mounted on the fourth substrate face, the illumination light and the first detection light enter the light guide plate through the first incident face, the second detection light enters the light guide plate through the second light incident face, the third detection light enters the light guide plate through the third light incident face, the fourth detection light enters the light plate through the fourth light incident face.

8. The illumination device according to claim 7 ,

a first optical axis of the illumination light intersecting a plane of the wiring substrate, and

a second optical axis of the first detection light intersecting the plane of the wiring substrate.

9. The light illumination device according to claim 1 ,

an object to be detected being irradiated with the first detection light.

10. The illumination device according to claim 7 ,

the first detection light exiting from a light emitting face of the light guide plate.

11. The illumination device according to claim 7 ,

the wiring substrate covering at least a part of an end face of the light guide plate.