| 摘要 |
A method and apparatus using bending wave vibration to calculate information relating to a contact on a contact sensitive device (10). The method compris es the steps of providing a member in the contact sensitive device capable of supporting bending waves, providing means attached to the member for measuri ng 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 capabl e 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 t he plate.
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