OPTICAL TOUCH SENSOR

An optical sensor including lenses along two opposite edges of a detection area, light emitters mounted along a specific one of the edges, each emitter projecting light beams through a respective one of the lenses, wherein the lenses split the projected emitter light into a plurality of divergent light beams directed across the detection area to respective pluralities of lenses along the edge of the detection area opposite the specific edge, wherein light intensity of each directed light beam is maximized along its center and an intensity distribution within each directed beam is known, light detectors along the edge opposite the specific edge, each detector receiving light directed across the detection area through a respective one of the lenses, and a processor receiving outputs from the detectors and calculating object locations in the detection area based on the known intensity distribution within each directed light beam and the received outputs.