Position sensor

G - Physics – 06 – K

Patent

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Details

G06K 11/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2388201

A low cost x-y digitising system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitizer includes a resonant stylus, an excitation winding for energising the resonant stylus and a set of sensor windings for sensing the signal generated by the stylus, from which the x-y position of the stylus is determined. The excitation signals applied to the excitation winding are designed to reduce the power drawn from the power supply which makes the digitising system particularly suited to battery operation.

L'invention concerne un système de numérisation x-y à faible coût, utilisé dans des appareils électroniques de consommateur, tels que des assistants numériques portables, des téléphones portables, des navigateurs Internet et d'autres appareils du même type. Le numériseur comporte un palpeur de résonance, un bobinage d'excitation, afin de fournir de l'énergie au palpeur de résonance et un ensemble de bobinages de capteur, utilisé pour capter le signal produit par le palpeur, à partir duquel la position x-y du palpeur est déterminée. Les signaux d'excitation appliqués au bobinage d'excitation sont conçus de manière à réduire l'énergie puisée à la source d'alimentation, ce qui rend le système de numérisation particulièrement adapté au fonctionnement sur batterie.

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