| 摘要 |
<p>PURPOSE:To detect not only the start of the depressing operation of a pen, etc., but also the magnitude of a depressing force although the tablet is a pressure sensitive resistance type of simple constitution. CONSTITUTION:The pressure sensitive resistance type tablet which outputs the depression coordinate position of the pen 10, etc., as a divided voltage value detects the depressing force of the pen 10, etc., by finding the potential difference due to contact resistance from data when an X-side 1st switch 15 and a Y-side 2nd switch 18 are closed and X-Y changeover switch 19 is switched from one side to the other and X-and Y-coordinate position data; when a point P on an X-coordinate resistance plate 12 is pressed with the pen 10, etc., in stand-by mode, a voltage Vp is developed at the point P. Then when the X-Y changeover switch 19 is switched to a Y-coordinate detection side contact 19x, a voltage Vq is developed at a point Q. The voltage drop Vr by contact resistance (r) is represented as Vr=Vp-Vq=VccXrdivided by (x1+r+y2) and becomes depressing force data of the pen 10, etc.</p> |
