| 摘要 |
<p>PURPOSE:To assume distortion by means of the voltage of the intermediate tap even when the resistor of a conductive sheet is not equal and the distortion occurs at the voltage inclination at voltage application by providing the intermediate tap at the conductive sheet and detecting the voltage of the intermediate tap at the time of the voltage impression. CONSTITUTION:At the center of resistor of the upper side panel and the lower side panel, intermediate taps M and N are provided, the intermediate tap M is connected through a buffer amplifier 7m and a gate 8m to an A/D converting device 3 and the intermediate tap N is connected through a buffer amplifier 7n and a gate 8n to the A/D converting device 3. A CPU 2, when a voltage Vcc is applied to an upper side panel 10, gates 8a and 8b are turned on, the actual voltage between A-B is measured, at such a time, the gate 8m is turned on simultaneously, and the voltage of the center of the upper side panel 10 is also measured. The same operation is executed even when the voltage Vcc is applied to the lower side panel 20. By calculating the contact position based upon the voltage of the intermediate tap in addition to the voltage of the electrode terminal at both edges, the error due to the distortion can be corrected and the correct contact position is detected.</p> |
