Contact sensitive device

G - Physics – 06 – F

Patent

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G06F 3/043 (2006.01)

Patent

CA 2392431

A method and apparatus using bending wave vibration to calculate information relating to a contact on a contact sensitive device (10). The method comprises the steps of providing a member in the contact sensitive device capable of supporting bending waves, providing means attached to the member for measuring bending wave propagation in the member to determine a measured bending wave signal and processing the measured bending wave signal to calculate information relating to the contact. The contact sensitive device (10) may comprise a transparent touch sensitive plate (12) mounted in front of a display device (14). A stylus (18) in the form of a pen may be used for writing text (20) or other matter on the touch sensitive plate (12). The transparent touch sensitive plate (12) may also be an acoustic device capable of supporting bending wave vibration. Three transducers (16) are mounted on the plate (12). At least two of the transducers (16) are sensing transducers or sensors and are thus sensitive to and monitor bending wave vibration in the plate.

L'invention concerne un procédé et un appareil qui utilisent une vibration d'onde de flexion afin de calculer une information se rapportant à un contact sur un dispositif tactile (10). Le procédé consiste à mettre en oeuvre un élément, dans ce dispositif, capable de supporter des ondes de flexion, des moyens fixés à l'élément destinés à mesurer la propagation d'ondes de flexion dans cet élément afin de déterminer un signal d'ondes de flexion mesuré, et à traiter ce signal mesuré afin de calculer une information se rapportant au contact. Le dispositif tactile (10) peut comprendre une plaque tactile transparente (12) montée sur le dessus d'un dispositif d'affichage (14). On peut utiliser, sur la plaque tactile (12), un stylet (18), sous la forme d'une plume, afin d'écrire du texte (20), ou bien une autre matière. On peut aussi substituer à la plaque tactile transparente (12) un dispositif acoustique apte à supporter une vibration d'ondes de flexion. Trois transducteurs (16) sont montés sur la plaque (12). Au moins deux des transducteurs (16) sont des transducteurs capteurs, ou bien des capteurs, et sont donc sensibles aux vibrations de flexion et permettent un suivi des vibrations de flexion de la plaque.

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