| 摘要 |
<p>PURPOSE:To eliminate a need of selection among pens different in thickness by measuring the pen pressure applied to an LED by a pressure-sensitive rubber switch to determine a pen thickness corresponding to the pen pressure and outputting it to the LED to change the pen thickness in accordance with the pen pressure. CONSTITUTION:A certain voltage is applied to a pressure-sensitive rubber 3 in the base part of a rod 2 which holds an LED 1, and the change of the resistance value due to the pressure applied to the pressure-sensitive rubber 3 is taken out as a voltage by a current-voltage converting circuit 6 when a character or the like is entered on an LCD 13, and this voltage is digitally converted by an A/D converter 7 and is fetched into a CPU 8. The light spot position irradiated by the LED 1 is fetched into the CPU 8 through an optical position coordinate detecting circuit 10 by a PSD 9 and is converted to a signal corresponding to the digital conversion value of the A/D converter 7 and is displayed with a line thickness corresponding to the pen pressure on an LCD 13 through an LCD controller 11 and an LCD driver 12.</p> |
