| 摘要 |
PURPOSE:To mechanically set a pressure sensitivity corresponding to the pen pressure by setting a turning-on area, a turning-off area, and a blind area based on a maximum pen pressure measured with a pressure-sensitive rubber switch. CONSTITUTION:A certain voltage is applied to a pressure-sensitive rubber 3, and the change of a 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, and a maximum value of the pen pressure is read and a threshold level of a turning- on/off signal is set together with the blind sector. The light spot position irradiated by an LED 1 is fetched into the CPU 8 through an optical position coordinate detecting circuit 10 by a PSD 9, and the light spot position is displayed on the LCD 13 by an LCD controller 11 and an LCD driver 12.
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