Stylus input device utilizing a permanent magnet

G - Physics – 06 – K

Patent

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Details

G06K 11/06 (2006.01) G06F 3/03 (2006.01) G06F 3/033 (2006.01) G09G 5/00 (2006.01)

Patent

CA 2429612

A stylus (30) that operates utilizing magnetic fields, wherein a permanent magnet (32) is disposed within a passive stylus that is detectable by a plurality of magnetic sensors (10, 12) 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 (10, 12) that are used, wherein one set of magnetic sensors can be used as a reference for earth's magnetic field, and wherein each of the magnetic sensors includes a polarizing coil to change direction of sensitivity (14), a null coil (42) and a flipping coil (44).

La présente invention concerne un stylet (30) qui fonctionne en utilisant des champs magnétiques, dans lequel un aimant (32) permanent est placé dans un stylet passif qu'une pluralité de capteurs magnétiques (10, 12) peuvent détecter, lesquels éliminent le champ magnétique du stylet du champ magnétique terrestre relatif de façon à obtenir des vecteurs qu'on utilise dans une équation de triangulation afin de déterminer l'emplacement de ce stylet (30) en deux ou trois dimensions, en fonction du nombre de capteurs magnétiques (10, 12) utilisés. On peut utiliser un ensemble de capteurs magnétiques comme référence du champ magnétique terrestre, et chacun de ces capteurs magnétiques comprend un enroulement de polarisation destiné à modifier le sens de la sensibilité (14), un enroulement de champ zéro (42) et un enroulement de basculement (44).

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