| 摘要 |
<p>PURPOSE:To easily execute arithmetic by detecting oscillation, which is inputted by an oscillating pen, by plural sensors to be provided on an oscillation transmitting board, subtracting an oscillation transmitting time, which is from a stored reference point, from an obtained oscillation transmitting time and obtaining a coordinate input point. CONSTITUTION:A user has an oscillating pen 3 in a hand a inputs coordinates in a position on an oscillation transmitting board 8. The oscillation transmitting board 8 transmits the ultrasonic oscillation, which is received from the oscillating pen 3, to oscillation sensors 6a-6c. The information of the measured oscillation transmitting time from a reference point 8a, which is equally distant from the sensors 6a-6c, to the sensors and the true oscillation transmitting time are stored to the memory of an arithmetic and control circuit 1. The oscillation transmitting time from the arbitrary coordinate input point to the sensors 6a-6c is obtained by a signal waveform detecting circuit 9, the circuit 1 subtracts the stored oscillation transmitting time from the obtained oscillation transmitting time and operates the coordinate input point based on the result of the subtraction and the information of the true oscillation transmitting time.</p> |
