Telegraphy – Systems – Position coordinate determination for writing
Patent
1987-01-23
1988-07-19
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
367907, G08C 2100, G09G 100
Patent
active
047586915
ABSTRACT:
The apparatus contains two fixed ultrasound transmitters, an ultrasound receiver forming part of the movable object, and a calculator. A trigger signal from the calculator releases ultrasonic pulses on the ultrasound transmitters and the calculator determines the coordinates of the ultrasound receiver and hence of the movable object from the times required for the ultrasonic pulses to travel from the ultrasound transmitters to the ultrasound receiver and from the distance between the ultrasound transmitter. The apparatus is suitable in particular for controlling the cursor on a screen by means of a so-called "mouse" and enables precise determination of position and accurate and simple calculation of coordinates and may therefore be used as so-called "digitizer" for geometric data processing.
REFERENCES:
patent: 4317005 (1982-02-01), De Bruyne
patent: 4506354 (1985-03-01), Hansen
patent: 4578674 (1986-03-01), Baker et al.
"Zweiohrige Maus " (two-eared mouse) by P. Wendt in mc Die Mikrocomputer Zweschrift, No. 10/1984.
"An Ultrasonic Radar Graphic Input Table", by P. de Bruyne in Scientia Electrica, vol. 30, Fasc. 1 (1984), pp. 1-26.
IEEE Transactions on Computers, vol. C-19, No. 6, Jun. 1970, pp. 546-548, "A Sonic Pen: A Digital Stylus System" by A. E. Brenner and P. de Bruyne.
IEEE Computer Graphics and Applications, Dec. 1986, "Compact Large-Area Graphic Digitizer for Personal Computers" by P. de Bruyne, pp. 49-53.
Schreyer Stafford D.
Zellweger Uster Ltd.
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