| 摘要 |
<p>PURPOSE:To detect the faintness or blur of a drawn line and prevent the break of this line by putting two pressure-sensitive sheets having different levels of sensitivity on each other and sensing the sheet of higher sensitivity at a level higher than the finger contact pressure. CONSTITUTION:A pressure-sensitive drawing pad is made by putting an insulated sheet 15 on a normal heat-sensitive drawing pad containing a resistance sheet 16, a pressure-sensitive sheet 17 and a resistance sheet 18 together with a film switch 10 consisting of a resistance sheet 12, a pressure-sensitive sheet 13 and a resistance sheet 14 and conducts with the finger contact pressure lower than a level sensitive with the normal pressure-sensitive drawing pad. Thus the switch 10 conducts even in such a case where the wiring speed of an input pen is rather high and writing pressure is reduced down to such a level where the sheet 17 does no conduct. Under such conditions, a pen-down state is decided. Then a pen-up state is decided only when both sheets 13 and 17 are not conductive.</p> |
