Stylus input device utilizing a permanent magnet

G - Physics – 06 – F

Patent

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Details

G06F 3/033 (2006.01) G06F 3/046 (2006.01)

Patent

CA 2484658

A stylus that operates utilizing magnetic fields (the field within the area 16), wherein a permanent magnet (32) is disposed within a passive stylus (32) that is detectable by a plurality of magnetic sensors (sensor 8 located in location 14) that remove the magnetic field of the stylus from the earth's relative magnetic field to thereby obtain vectors that are used in a triangulation equation to determine the location of the stylus (30) in two or three dimensions, depending upon the number of magnetic sensors (8) that are used, wherein one set of magnetic sensors (10, 12, 20) can be used as a reference for earth's magnetic field, and wherein each of the magnetic sensors (8) includes a polarizing coil to change direction of sensitivity, a null coil (42) and a flipping coil (44).

Cette invention concerne un stylet faisant intervenir des champs magnétiques (champ de la zone 16). Un aimant permanent (32) est disposé dans un stylet passif (30) détectable par une pluralité de capteurs magnétiques (capteur 8 de l'emplacement 14) qui éliminent le champ magnétique du stylet provenant du champ magnétique terrestre relatif de manière à obtenir des vecteurs qui s'utilisent dans un équation de triangulation pour déterminer la position du stylet (30) en deux ou trois dimensions, selon le nombre de capteurs magnétiques (8) utilisés. Un ensemble de capteurs magnétiques (10, 12, 20) peut être utilisé comme référence pour le champ magnétique terrestre et chacun des capteurs magnétiques (8) comprend un enroulement de polarisation destiné à modifier le sens de la sensibilité, un enroulement de champ zéro (42) et un enroulement de basculement (44).

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