| 摘要 |
The graphic data acquisition device has a pen (10) with two ultrasonic emitters (12,14) near its tip. Multiple ultrasonic detectors (62) are placed at regular intervals in a line along the top of the drawing board (50).The propagation time of the ultrasonic pulse is measured to determine the coordinates of the vector defined by the positions of the two transmitters, and from this the position of the pen tip on the drawing surface can be deduced. The inclination of the pen and its orientation about its own axis can also be deduced. The pressure between the tip and the drawing surface is measured to determine, with slope data, the line width.
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