Patent ID: 7343807

Claim:
A foil-type pressure sensor associated with an evaluation circuit, wherein said foil-type pressure sensor comprises: a first carrier foil and a second carrier foil, arranged a certain distance apart from each other by means of a spacer, the spacer having at least one recess which defines an active zone of the pressure sensor in which the two carrier foils face each other; a first electrode and a second electrode and a layer made of pressure sensitive material, said first electrode, said second electrode and said layer of pressure sensitive material being applied, in the active zone, respectively on the first and the second carrier foil in such a way that when the carrier foils are pressed together, an electrical contact is established via the pressure sensitive layer between the first and second electrodes, and wherein, the first electrode and the second electrode are connected to said evaluating circuit in such a way that, during use of the pressure sensor, an electrical resistance of the electrical contact between the first and second electrode can be measured; and at least one third electrode which is applied on either the first or the second carrier foil in the active zone of the pressure sensor in such a way that when the carrier foils are pressed together, an electrical contact is established by the pressure sensitive layer between the third electrode and the first electrode and/or between the third electrode and the second electrode, wherein the third electrode is connected to said evaluating circuit in such a way that, during use of the pressure sensor, an electrical resistance of the electrical contact between the third electrode and the first electrode and/or between the third electrode and the second electrode can be measured.