Touch panel using acoustic wave reflection
First Claim
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1. A touch position sensor comprising:
- a. a substrate capable of propagating a shear wave, said substrate having at lease one touch surface;
b. a first transducer or first linear transducer array positioned along first edge of said substrate,c. a second transducer or second linear transducer array positioned along second edge of said substrate at a predetermined angle to the first edge, said transducer arrays or transducers being such as to act as transmitters and receivers of shear waves on said substrate,d. a pulsed source of energy connected to said transducers for generating shear wave on the substrate, ande. receiver and timing means connected to the transducers for detecting and timing reflected energy pulses such that the position of a human finger or other passive stylus placed on the substrate and causing reflections will be determine.
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Abstract
A touch position sensor is shown in which a transducer or transducer array mounted to a side of a substrate generates pulse shear-mode acoustic wave and receives the partial wave reflected by the finger or other styles. An electronic circuitry connected to the transducers determine the position of the finger or style in geometrical coordinate terms by detecting time interval between the transmitted wave and reflected wave.
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Citations
8 Claims
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1. A touch position sensor comprising:
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a. a substrate capable of propagating a shear wave, said substrate having at lease one touch surface; b. a first transducer or first linear transducer array positioned along first edge of said substrate, c. a second transducer or second linear transducer array positioned along second edge of said substrate at a predetermined angle to the first edge, said transducer arrays or transducers being such as to act as transmitters and receivers of shear waves on said substrate, d. a pulsed source of energy connected to said transducers for generating shear wave on the substrate, and e. receiver and timing means connected to the transducers for detecting and timing reflected energy pulses such that the position of a human finger or other passive stylus placed on the substrate and causing reflections will be determine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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Current Assignee3M Touch Systems Incorporated (3M Company)
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Original AssigneeMicroTouch Systems, Inc. (3M Company)
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InventorsHuang, Jianming
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Primary Examiner(s)CHANG, KENT WU
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Application NumberUS08/963,009Time in Patent Office960 DaysField of Search345/173, 345/176, 345/177, 178/18.01, 178/18.03, 178/18.04, 367/907US Class Current345/177CPC Class CodesG06F 3/0436 in which generating transdu...
