Patent ID: 6078315
Filing Date: 2000-06-20
Classification: G06F

Abstract:
A touch position sensor comprising:a. a substrate capable of propagating a shear wave, said substrate having at lease one touch surface;b. a first transducer or first linear transducer array positioned along first edge of said substrate,c. a second transducer or second linear transducer array positioned along second edge of said substrate at a predetermined angle to the first edge, said transducer arrays or transducers being such as to act as transmitters and receivers of shear waves on said substrate,d. a pulsed source of energy connected to said transducers for generating shear wave on the substrate, ande. receiver and timing means connected to the transducers for detecting and timing reflected energy pulses such that the position of a human finger or other passive stylus placed on the substrate and causing reflections will be determine.