Ultrasonic coordinates input device

Details Ultrasonic coordinates input device Ultrasonic coordinates input device

1995-08-29

1998-05-12

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

345177, G08C 2100

Patent

active

057509417

ABSTRACT:
The ultrasonic coordinates input device includes receivers grouped into a plurality of groups, each receiver receiving the ultrasonic waves propagated through a propagator so as to calculate the coordinates of the ultrasonic wave inputted positions on the basis of signals received by each group, thereby ensuring that the coordinates are calculated with a simple mathematical formulae with a negligible error if any.

REFERENCES:
patent: 4758691 (1988-07-01), De Brunye
patent: 4814552 (1989-03-01), Stefik et al.
patent: 4991148 (1991-02-01), Gilchrist
patent: 5402151 (1995-03-01), Duwaer
patent: 5561447 (1996-10-01), Suzuki et al.
patent: 5565893 (1996-10-01), Sato et al.
patent: 5573077 (1996-11-01), Knowles

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