The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 1981
Filed:
Jul. 06, 1979
Toshihiko Kobayashi, Musashino, JP;
Tetsusaburo Kamibayashi, Niza, JP;
Kokusai Denshin Denwa Kabushiki Kaisha, Tokyo, JP;
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.