| 摘要 |
A co-ordinate plate for a co-ordinate reader, which utilizes delays of oscillation waves in a magnetostrictive material. The co-ordinate plate is composed of two sheets of magnetostrictive material, which have a common co-ordinate plane and an acoustically insulating sheet therebetween, and in which propagation characteristics of the magnetostrictive oscillation waves are approximate to each other in a direction of a first line formed, on the co-ordinate plane, by the loci of many points having the same one of the two components of their co-ordinates and in a direction of a second line formed, on the co-ordinate plane, by the loci of many points having the other same component of the two components of their coordinates. Two exciting coils are provided for producing magnetostrictive oscillation in the thin plate of magnetostructive material in the directions of the first and second lines. Flux keepers are further provided for shielding magnetix fluxes emanating from the exciting coils.
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