Foil-type switching element with improved spacer design
First Claim
1. 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.
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Accused Products
Abstract
A foil-type switching element comprises a first carrier foil and a second carrier foil arranged at a certain distance from each other by means of a spacer 10. The spacer 10 comprises at least one recess 12 defining an active area of the switching element. At least two electrodes and a layer of pressure sensitive material are arranged within the active area of the switching element between the first and second carrier foils in such a way that, in response to a pressure acting on the active area of the switching element, the first and second carrier foils are pressed together against the reaction force of the elastic carrier foils and an electrical contact is established between the at least two electrodes via the pressure sensitive material. The active area comprises an inner region 14 and a number of outer regions 18, the inner region having a generally convex shape and the outer regions extending outwardly from said inner region.
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Citations
13 Claims
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1. A Foil-type pressure sensor having an electrical resistance which varies with the amount of pressure applied comprising:
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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; andat 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification