Patent ID: 8436834

Claim:
An optical touch device , comprising: a light guide module comprising a first light guide component, a second light guide component, a third light guide component and a fourth light guide component arranged along four sides of a rectangle, the first light guide component, the second light guide component, the third light guide component and the fourth light guide component defining a detecting area therebetwen, the first light guide component facing to the third light guide component, the second light guide component facing to the fourth light guide component, each of the first light guide component and the second light guide component having a first surface facing to the detecting area, each of the third light guide component and the fourth light guide component being a mirror light guide component, the mirror light guide component comprising a light emitting end facing to the detecting area, a second surface opposite to the light emitting end, and a light incident end connected between the light emitting end and the second surface, and the second surface having a mirror light reflecting layer formed thereon; a light source module comprising: a first light emitting component for providing light to the light incident end of the third light guide component; and a second light emitting component for providing light to the light incident end of the fourth light guide component, wherein the first light emitting component and the second light emitting component are configured for emitting light alternately, the first surfaces of the first light guide component and the second light guide component are configured for guiding the light to the detecting area; and an image detecting module disposed between two neighboring ends of the first light guide component and the second light guide component, and a field of view of the image detecting module covering the detecting area, the third light guide component and the fourth light guide component.