Seat belt warning system
First Claim
1. A seat belt warning system comprisinga sensor mat having a surface and adapted for detecting a force acting upon the surface in a direction, said sensor mat comprisinga first conductive layer, a second conductive layer and a third conductive layer disposed in parallel, spaced relationship;
- a first dielectric layer interposed between the first conductive layer and the second conductive layer and having a first compressibility in response to the force, said first conductive layer, said first dielectric layer and said second conductive layer forming a first electrical capacitor acted upon by the force and characterized by a first capacitance that varies dependent upon the force; and
a second dielectric layer interposed between the second conductive layer and the third conductive layer and having a second compressibility in response to the force, said second compressibility being different from the first compressibility, said second conductive layer, said second dielectric layer and said third conductive layer forming a second electrical capacitor acted upon by the force and characterized by a second capacitance that varies dependent upon the force different from the first capacitance.
5 Assignments
0 Petitions
Accused Products
Abstract
A safety belt warning system for vehicles comprises a sensor mat for the detection of a force acting on its surface, which includes, for the formation of two electrical capacitors, two dielectric layers which are located one above the other in sandwich fashion and arranged in each case between electrically conductive coats, and which have different compressibility at least in the direction of loading due to force, so that the capacitances of the two capacitors vary differently with a load on the sensor mat.
18 Citations
15 Claims
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1. A seat belt warning system comprising
a sensor mat having a surface and adapted for detecting a force acting upon the surface in a direction, said sensor mat comprising a first conductive layer, a second conductive layer and a third conductive layer disposed in parallel, spaced relationship; -
a first dielectric layer interposed between the first conductive layer and the second conductive layer and having a first compressibility in response to the force, said first conductive layer, said first dielectric layer and said second conductive layer forming a first electrical capacitor acted upon by the force and characterized by a first capacitance that varies dependent upon the force; and a second dielectric layer interposed between the second conductive layer and the third conductive layer and having a second compressibility in response to the force, said second compressibility being different from the first compressibility, said second conductive layer, said second dielectric layer and said third conductive layer forming a second electrical capacitor acted upon by the force and characterized by a second capacitance that varies dependent upon the force different from the first capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification