| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the sensitivity of a touch sensor without increase in size. <P>SOLUTION: A touch sensor 1 has: an oscillator 2 outputting an operation signal which periodically changes; an antenna electrode 3 having a capacitance which distorts the operation signal to form an output signal and which is changed by an approach of a human body, and changing a waveform of the output signal by the capacitance; a comparator 4 outputting a detection signal depending on a difference between the output signal and a preliminarily-set reference voltage, from an output part 8; an integration circuit 5 connected with the output part 8 of the comparator 4; and determination means 2 determining whether or not the human body approaches to the antenna electrode 3 based on a detection value that is output from the integration circuit 5. In the touch sensor 1, as a pull-up power supply of the comparator 4, the oscillator 2 is connected to the output part 8 of the comparator 4 via a resistance R4. <P>COPYRIGHT: (C)2012,JPO&INPIT |
