Telegraphy – Systems – Position coordinate determination for writing
Patent
1994-06-07
1996-11-12
Chin, Stephen
Telegraphy
Systems
Position coordinate determination for writing
345177, G08C 2100
Patent
active
055730779
ABSTRACT:
An acoustic touch position sensor is shown in which a number of transducers coupled to a side of a substrate impart a shear wave into the substrate for propagation along a number of paths parallel to a first axis. A reflective edge of the substrate first axis disposed along the first axis reflects the shear waves back along the parallel paths to the transducers. The transducers are responsive to the receipt of a shear wave for generating a signal representative thereof. A touch on the substrate results in perturbation in the shear wave which is sensed to determine the axial position of the touch on the substrate.
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Chin Stephen
Loomis Paul
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