Optical System

Abstract: A touch sensitive apparatus comprises: a top plate having one or more light sources associated therewith, such that light from the one or more 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. Each of the one or more light sources is disposed within the top plate in a recess for that light source, wherein the recess has one or more refracting input faces such that light from a light source is coupled into the body of the top plate through the one or more refracting input faces.

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