Improved pen positioning system

Details Improved pen positioning system Improved pen positioning system

G - Physics

06

F

G06F 3/033 (2006.01)

Patent

CA 2316208

A pen positioning system is provided, in which a pen, having multiple output elements, is adapted to accurately determine the location of the pointing tip of the pen, in relation to an electronic tablet. The output elements, preferably ultrasonic transmitters having distinct frequencies, are located at a fixed distance from each other, and are also related in space to the pointing tip of the pen. The geometric relationship between the output elements and the pointing tip of the pen allows the location of the pointing tip to be determined, independent of the angle at which the pen is inclined against the surface of the writing tablet. A detection system is used to receive the output signals from the output elements, isolate the output signals from each other, and process them independently to determine the location of the output elements and of the pointing tip of the pen. Alternative embodiments include an additional output element on a pressure sensitive shell of the pen, which allows the pen to accurately provide pressure sensitive output signal information.

L'invention porte sur un système de positionnement d'un crayon muni de plusieurs émetteurs et conçu pour déterminer avec précision la position de la pointe du crayon par rapport à une tablette électronique. Les émetteurs, de préférence des émetteurs d'ultrasons de fréquences distinctes, sont placés à des distances identiques les uns des autres et en rapport spatial avec la pointe du crayon. Les relations géométriques entre les émetteurs et la pointe du crayon sont indépendantes de l'inclinaison du crayon par rapport à la tablette. Un système de détection recevant les signaux des émetteurs les isole les uns des autres et les traite indépendamment pour déterminer l'emplacement des émetteurs et de la pointe du crayon. Dans des variantes, il est prévu un émetteur supplémentaire placé sur un capuchon piézosensible du crayon et émettant des informations précises de pression.

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