Patent ID: 6724371
Filing Date: 2004-04-20
Classification: G06F

Abstract:
A handheld device for use with a board supplemented with a processing system for digitizing operative strokes of the handheld device on the board, the handheld device comprising:(a) a housing having a substantially cylindrical bore therein terminating at a distal end of said housing with a central orifice communicating with said bore, said housing receiving a portion of a body of a drawing implement with its drawing tip extending from said central orifice, said housing being formed with a plurality of openings being circumferencly arranged at said distal end of said housing and communicating with said bore; and (b) an ultrasonic receiver or transmitter device mounted within said housing, remote from said drawing tip, yet in close proximity with said bore, said device being for receiving or transmitting an intermittent ultrasound signal through said bore and said plurality of openings, thereby enabling triangulation of said drawing tip.