Patent ID: 7187264

Claim:
A Foil-type pressure sensor having an electrical resistance which varies with the amount of pressure applied comprising: a first carrier foil and a second carrier foil arranged at a certain distance from each other by means of a spacer, said spacer comprising at least one recess defining an active area of the pressure sensor; wherein the form of said recess is such that said active area comprises an inner region and a number of outer regions, said inner region having a generally convex shape to provide mechanical response for small forces of pressure and to set of turn-on points, and said outer regions extending outwardly from said inner region to provide mechanical response for higher forces of pressure, said outer regions having predetermined widths to ensure smooth transition in mechanical behavior between the inner region and the outer regions of said active area; and at least two electrodes and a layer of pressure sensitive material, said electrodes and said layer of pressure sensitive semiconductor material being centrally arranged within the active area of the pressure sensor between said first and second carrier foils so as to be at least partially located within the inner region of the active area.