| 摘要 |
<p>PURPOSE:To detect only an indicated contacting point accurately, by grounding all electrodes except an electrode deected by a touch detection part through a switch means. CONSTITUTION:When some of contact parts, e.g. TCHx1-y1 is touched with a finger, a counter CNT starts counting and its contents are decoded by a switch decoder SW.DEC. Then, only a terminal corresponding to a switch SW1 is held at a level 1, so the switch SW1 corresponding to an electrode y1 is connected to a terminal side S1 to be detected. Since, however, the output signal of terminals corresponding to switches SW2-SW8 are at 0, a connection with a terminal side S2 is made and other electrodex x1-x4, and y2-y4 are grounded through the switches SW2-SW8. Therefore, other latches L2-L8 never store outputs of corresponding touch inspection parts.</p> |
