| 摘要 |
<p>PURPOSE:To form an ideal equi-potential plane on a resistive film and to decrease the number of input lines to a resistor terminal board, by arranging the resistor terminal board having a sufficiently smaller resistance value than that of the resistive film while the electrically connecting around the resistive film. CONSTITUTION:When a pressing point 38 is depressed with a writing tool 37 from the upper part of an insulation film 16, a resistance film 19 and a conductor film 17 are conductive at the pressing point with a pressure sensing rubber 18. When switches 33-36 are selected as shown in Figure in a timing, a DC voltage is applied between terminal groups 22 and 23 on a resistor terminal board 20 from a DC power supply 32. Since diode groups 30 and 31 are reverse- biased, the diode groups give no effect as the fluctuation of potential on the film 19 and the terminal board 20. The potential on the film 19 at the pressing point 38 is detected with the conductor film 17, allowing to detect coordinates to longitudinal direction of an input panel. At the next timing, since each contact of the switches 33-36 is selected as shown in dotted lines, the lateral potential of the input panel can similarly be obtained.</p> |
