| 摘要 |
<p>There is provided a highly precise coordinate input device not requiring a particular designating tool. A sheet (4), composed of a piezoelectric plate polarized in the direction of thickness, is superposed with a vibration transmitting plate (8), provided with vibration sensors (6) in predetermined positions. The sheet generates vibration by a pulse signal generated by a sheet driver. When the sheet (4) is pressed for example with a pen (3), the vibration is transmitted to the vibration transmitting plate (8) from the pressed position, and is detected by the vibration sensors. A controller (1) calculates the distance between the vibration input point and the vibration sensor (6), based on the delay time from the start of vibration to the detection. This operation is conducted for the plural sensors (6), and the coordinate is calculated from thus calculated distances.</p> |
