| 摘要 |
<p>PURPOSE:To reduce the thickness of the elastic medium of an input plate by allowing an elastic wave which propagates in the elastic medium not to propagate in a free plane, but to propagate concentrically in a propagation channel formed internally. CONSTITUTION:The peak part 63 of a position indicator 6 is set abutting on a desired point 0 on the input plate 1 to supply a specific electric signal to a lead wire 61 and then a mechanical oscillation wave corresponding to the electric signal propagates radially from the point 0 in the 2nd layer 22 of the elastic medium 2 of the input plate 1. The mechanical oscillation wave which propagates in the layer 22 of the medium 2 at a specific speed is detected by a signal converter 7 arranged at each measurement reference point and converted into an electric signal, which is outputted to a processor from the lean wire 71. Then, the processor obtains coordinate information on the point 0 on the basis of difference in the reception time of a signal from a signal converter 7 at each measurement reference point, thereby obtaining output information.</p> |
