Telegraphy – Systems – Position coordinate determination for writing
Patent
1979-07-06
1981-11-03
Strecker, Gerard R.
Telegraphy
Systems
Position coordinate determination for writing
178 19, 324262, 324208, G01R 3300, G01B 714, G08C 2100
Patent
active
042987725
ABSTRACT:
A coordinate reader comprising: a magnetostrictive plate, a plurality of excitation means each including at least three coils mounted on the magnetostrictive plate in two directions of coordinate axes along its marginal edges for generating magnetostrictive oscillation waves in the magnetostrictive plate, a detection coil employed to be placed at a desired position on the propagation paths of the magnetostrictive oscillation waves, and measuring means for obtaining a numerical value of the coordinates of the position of the detection coil from a time difference between the excitation of the magnetostrictive plate by the excitation means and the detected output from the detection coil. Adjusting means is provided for adjusting the measuring means so that when the detection coil is disposed on the magnetostrictive plate at each position equally spaced from each of the coordinate axes, substantially equal numerical values are obtained from the excitation means.
REFERENCES:
patent: 3134099 (1964-05-01), Woo
patent: 3684828 (1972-08-01), Maher
Kamibayashi Tetsusaburo
Kobayashi Toshihiko
Adams Bruce L.
Burns Robert E.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
Snow Walter E.
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