Patent ID: 9035662
Filing Date: 2015-05-19
Classification: G01D,G01R,G01V

Abstract:
1. A device for the capacitive detection of an object such as a post, a line or a finger which is arranged behind a flat article that is transparent to electromagnetic radiation, comprising a sensor which comprises at least one sensor electrode for at least one of the detection of the object or for the detection of relative movements between the sensor and at least one of the flat article or the finger, a control circuit for controlling the at least one sensor electrode and for evaluating the output signals of the sensor, wherein the at least one sensor electrode surrounded by at least one surrounding further electrode, wherein the surrounding further electrode is connected to the at least one sensor electrode by the control circuit whereby in the event of a change in a potential of the at least one sensor electrode, a potential of the surrounding further electrode is regulated by a closed-loop control in the opposite sense to the at least one sensor electrode whereby the at least one sensor electrode remains at a pre-determined or a pre-definable potential.