Patent ID: 8436494

Claim:
A touch sensor device, comprising: a touch sensor for converting presence or absence of an operation into a voltage value, and sending out an output voltage signal representing the voltage value; operation presence/absence determination means which, when the output voltage signal has a value equal to or more than a first threshold value, determines that the touch sensor is in an operated state; stability determination means for detecting whether or not a differential signal representing a differential value obtained by differentiating the output voltage signal is limited within a predetermined range defined by a third threshold value defining an upper limit and a fourth threshold value defining a lower limit; and count-up timer means which detects a period during which the differential signal is limited within the predetermined range on a premise that the output voltage signal has the value equal to or more than the first threshold value and, when a time based on the period becomes a fifth threshold value or more, sends out an ON determination signal and allows an external device to operate.