Optical System

Abstract: A touch sensitive apparatus comprises: a top plate having a plurality of light sources associated therewith, such that light from the plurality of light sources is transmitted within the top plate with total internal reflection; and a base plate having one or more detectors associated therewith for detecting light transmitted within the base plate. The top plate and the base plate are configured such that if an external body touches a first surface of the top plate, then light is coupled from a second surface of the top plate into the base plate through a first surface of the base plate. The plurality of light sources are disposed within a linearly extending recess in the second surface of the top plate such that light from the plurality of light sources is coupled into the top plate through a wall of the recess. The plurality of light sources form a linear array within said linearly extending recess.

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