Apparatus and method for determining a touch input

G - Physics – 01 – D

Patent

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G01D 5/24 (2006.01) G01F 23/26 (2006.01) G06F 3/044 (2006.01) H03K 17/955 (2006.01) H03K 17/96 (2006.01)

Patent

CA 2753680

A capacitive sensor for detecting a stimulus. The capacitive sensor includes an electrode and a processing unit electrically coupled to the electrode and configured to determine the presence of a stimulus based on the rate of change of the electrode capacitance. A substrate is positioned adjacent the electrode, wherein the stimulus corresponds to the placement of an object against the substrate. The processing unit is operative to determine a time rate of change based on successive measurements of the electrode capacitance. In addition, the processing unit is operative to determine the presence of a stimulus in response to the time rate of change being less than a reference value.

L'invention concerne un capteur capacitif permettant de détecter un stimulus. Le capteur capacitif comprend une électrode et une unité de traitement couplée électriquement à l'électrode et configurée pour déterminer la présence d'un stimulus d'après la vitesse de changement de la capacité d'électrode. Un substrat est placé à côté de l'électrode, le stimulus correspondant au placement d'un objet contre le substrat. L'unité de traitement est capable de déterminer une vitesse de changement dans le temps d'après les mesures successives de la capacité d'électrode. De plus, l'unité de traitement est capable de déterminer la présence d'un stimulus si la vitesse de changement dans le temps est inférieure à une valeur de référence.

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