Patent ID: 9052777
Filing Date: 2015-06-09
Classification: G06F

Abstract:
1. An optical element for a light based touch surface comprising a plurality of contiguous segments arranged along an edge of a touch surface, each segment comprising a series of two or more pairs of adjacent alternating facets, denoted (F 1 , FF 1 ) . . . , (F n , FF n ), each facet F and FF being a reflective or a refractive lens facet, and wherein either: the first facet, F, in each pair is oriented so as to collimate light emitted from a first light emitter component, denoted C, associated with that segment and the second facet, FF, in each pair is oriented so as to collimate light emitted from a second light emitter component, denoted CC and different than emitter C, associated with that segment; or the first facet, F, in each pair is oriented so as to direct collimated light to a first light receiver component, denoted C, associated with that segment, and the second facet, FF, in each pair is oriented so as to direct collimated light to a second light receiver component, denoted CC and different than receiver C, associated with that segment.