| 摘要 |
<p>PURPOSE:To reduce a coordinates detecting error due to the error of a vibration transmission time by providing a driving control means to drive the vibrator of a vibrating pen by the synthesizing signal of a pulse train in which plural phases are mutually different. CONSTITUTION:A vibrator 4 built in a vibrating pen 3 is driven by a vibrator driving circuit 2 and a driving signal is supplied from an arithmetic control circuit. An electrical driving signal is converted into an ultrasonic vibration by the vibrator 4 and transmitted through a horn part 5 to a diaphragm 8. For example, a driving signal is constituted of the pulse train (1010100101000010) of the constant interval of a first group and the succeeding pulse train of a second group whose phase is dislocated by 180 deg.. Thus, since a driving pulse train having a different phase is operated so as to attenuate the attenuation vibration of the vibrator, even when a direct wave and a reflecting wave are interfered in a driving sensor, the dislocation of the peak value of a detecting signal waveform is prevented, and the coordinates detecting error due to the error of the vibration transmission time can be reduced.</p> |
