Patent ID: 6734685
Filing Date: 2004-05-11
Classification: E03C,H03K

Abstract:
A touch sensor (S) defined by the following:a conductive sensor surface (Fs) insulated with respect to ground potential, the conductive sensor surface (Fs) being connected via a measuring resistor (Rs) to an a.c. voltage generator (U), a voltage difference (Us) across the measuring resistor (Rs) being used as a measuring signal, wherein a first input {overscore ((A))} of an AND circuit is connected via a NOT circuit to a generator side of the measuring resistor (Rs); a second input (B) of the AND circuit is connected to a sensor-surface side of the measuring resistor (Rs); an integrator (TP) is connected downstream of the AND circuit; a comparator (C) and/or microcontroller (C) is connected downstream of the integrator (TP).