Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With plurality of transducers
Patent
1994-04-06
1997-11-25
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With plurality of transducers
367127, 367907, 178 18, G08C 2100
Patent
active
056919590
ABSTRACT:
A digitizer uses acoustic waves originating from a stylus to determine the position of the stylus on a plate. The acoustic waves are introduced into the plate from the tip of the stylus and are detected by a plurality of detectors positioned at various points along the periphery of the plate. By sensing differences in the arrival times of the acoustic waves at the detectors, a microprocessor calculates the position of the stylus. In a preferred embodiment using a non-tethered stylus, four detectors are positioned at the corners of a rectangle, and the time differences are used as addresses in a lookup table, which is programmed to contain x and y coordinates corresponding to the time differences, Different embodiments may detect only the "fast" symmetrical waves or only the "slow" antisymmetrical waves generated in the plate, or may use the arrival times of both types of waves to determine the stylus position.
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Cummins James D.
Fairbanks John P.
Johnson Edwin F.
Kriewall James A.
Parry Robert W.
Fujitsu Ltd.
Lobo Ian J.
Steuber David E.
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