| 摘要 |
<p>PURPOSE:To reduce difference in the stroke pressure sensitivity of a pen touch at a coordinate position by applying a current value and a voltage value of an X and Y coordinates at a input point as reference values of detection to a constant fixed value. CONSTITUTION:Terminals of resistors 4 and 5 are connected to inverted and uninverted input terminals of operational amplifiers 21 and 22. Outputs of those operational amplifiers 21 and 22 are supplied to an adding circuit 23 and added to the reference voltage from a reference voltage source 10. The sum voltage is supplied as a reference voltage for detection to a comparing circuit 9 for pen touch detection.</p> |
