HANDWRITING DEVICE WITH DETECTION SENSORS FOR ABSOLUTE AND RELATIVE POSITIONING

The present invention is a method producing signals written by a user of a wireless pen (110), including the following steps: a first subsystem for determining absolute position of a location on the pen (110) with respect to a geometrical reference (205) spaced from the pen (110); operating the first subsystem at time intervals to obtain absolute position indications; a secon d subsystem that determines relative position excursions of the tip (112) of t he pen (110); and producing signals representative of said writing from the combination of the absolute and relative position determinations. The first subsystem operates at time intervals and uses less power than continuous absolute position determination. An embodiment includes the step of providin g the first subsystem that implements distance ranging in either or both directions between said location on the pen (110) and a plurality of locatio ns on the geometrical reference (205).