METHOD OF DETERMINING THE PEN VELOCITY ALONG A GRAPHIC TABLET, AND GRAPHIC TABLET SUITABLE FOR CARRYING OUT THE METHOD

摘要

The invention relates to the determination of the velocity of a conductive pen 102 along a graphic tablet 100. Generation of successive pulses in successive conductors, arranged in a regular pattern in the tablet, produces an electromagnetic signal in a conductive pen situated in the vicinity of the tablet. When the pen is near the writing surface of the tablet, the pen signal exhibits a local maximum which is indicative of the location of the pen. The distance between the edges to both sides of this local maximum constitutes an indication of the velocity of the pen.