| 摘要 |
<p>PURPOSE:To improve reliability by detecting the change of a static capacity with the touch of a detecting electrode as the change of voltage. CONSTITUTION:A touch-system input unit is composed of a detecting electrode 1, detecting circuit 5, power source circuit 6 and an oscillating circuit 8. The detecting electrode 1 is touched with a finger of an operator, then, the input electric potential Vin is charged. In the detecting circuit 5, a direct current power source VF is supplied as the action power source 6 and further, supplied through a resistor 4 to the detecting electrode 1. At such a time, since the oscillating circuit 8 sets a change of a static capacity due to the presence and absence of the touch of the finger, the circuit is installed between the power source circuit 6 and the ground and from this, an alternating voltage is overlapped. Thus, when the detecting electrode 1 is touched, the section between the ground and the detecting electrode 1 is released alternatingly, the detecting circuit 5 will not detect an input electric potential Vin, and at the time of touch, shortening is alternatingly executed and therefore, the input electric potential Vin is changed and touch is detected.</p> |
