Patent ID: 8970556
Filing Date: 2015-03-03
Classification: G06F

Abstract:
1. A sensing apparatus, comprising: a plurality of light sources each radiating light projected towards at least one of a proximate object and a touching object; and a light guide to receive the light radiated by each light source, to emit a portion of the light radiated by each light source to an upper part of the light guide, and to preserve another portion of the light radiated by each light source in an internal part of the light guide, based on a total internal reflection (TIR) angle of the light emitted by each light source, wherein the light guide comprises a plurality of edges, each having a cutting plane of a different angle, the angle being between the surface of the upper part of the light guide and the surface of the cutting plane, wherein each light source is disposed on a respective cutting plane of one of the plurality of edges, wherein each light source radiates light projected to a proximate object located in a different section of a proximate space of the upper part of the light guide according to each different cutting plane angle.