| 摘要 |
1. Device for determining coordinates of a point of a plane, comprising a plate on which along two adjacent edges there are piezoelectric transducers of Lamb wave pulses, supplied with a pulse signal, and containing a plate wave detector moved by an external control device on a sheet of paper lying on that plate, characterised in that the plate (2) is made of ferromagnetic material, and the plate wave detector (4) is comprised of a magnetic stream generating element with the core (6) in the form of a rod on which a miniature output signal coil (8) is wound, the core (6) being placed on the sheet of paper (5) in the magnetic core (7).<IMAGE>
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