| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a coordinate output device capable of outputting coordinates of a position of a writing utensil with high accuracy regardless of the position. <P>SOLUTION: A display 1 is arranged with ultrasonic receivers 11, 12, 13, and a pen 2 is provided with an ultrasonic element 22. An x-coordinate of a pen point 23 is calculated from transmission times D1, D2 until an ultrasonic signal sent from the ultrasonic element 22 reaches the ultrasonic receivers 11, 12. A y-coordinate of the pen point 23 is calculated from transmission times D1, D3 until the ultrasonic signal sent from the ultrasonic element 22 reaches the ultrasonic receivers 11, 13. <P>COPYRIGHT: (C)2004,JPO</p> |
