Acoustic touch position sensor using shear wave propagation

Details Acoustic touch position sensor using shear wave propagation Acoustic touch position sensor using shear wave propagation

1992-06-15

1993-11-09

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 19, 367907, 345177, G08C 2100

Patent

active

052605213

ABSTRACT:
An acoustic touch position sensor is shown in which a transducer coupled to a side of a substrate imparts a shear wave into the substrate for propagation along a first axis. A reflective array is disposed along the first axis to reflect portions of the shear wave along a plurality of parallel paths extending across a touch surface of the substrate to a second reflective array the axis of which is parallel to the axis of the first reflective array. The second reflective array reflects the shear waves incident thereto to a transducer mounted on the side of the substrate and responsive to shear waves propagated thereto for providing a signal representative of these shear waves. A touch on the substrate results in a partial absorption of the energy in the shear wave so as to produce a perturbation therein which is sensed to determine the axial position of the touch on the substrate. In a second embodiment a single transducer and reflective array is provided for each axis, a coordinate on which is to be determined. In a third embodiment of the present invention, a single transducer is provided to transmit and receive shear waves propagating along perpendicular parallel paths.

REFERENCES:
patent: 4317005 (1982-02-01), de Bruyne
patent: 4506354 (1985-03-01), Hansen
patent: 4644100 (1987-02-01), Brenner et al.
patent: 4645870 (1987-02-01), Adler
patent: 4825212 (1989-04-01), Adler et al.
patent: 5072427 (1991-12-01), Knowles
patent: 5177327 (1993-01-01), Knowles

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