| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a touch sensor low in cost and capable of surely a detecting even momentary contact. SOLUTION: An integration circuit is configured by combining a capacitor section consisting of a fixed capacitor C1 and an electrode D easily affected by the surrounding stray capacitance with a fixed resistor section R1 , a clock signal CLK with a constant frequency and a constant duty factor is given to the integration circuit and a charge/discharge signal from the integration circuit is given to a logic IC (IC1) and the logic IC (IC1) provides an output of a pulse in response to the charge/discharge signal. Thus, the duty factor of the output pulse of the logic IC (IC1) is changed due to a change in the stray capacitance of the electrode D when a human body is in contact with the electrode D.</p> |
