Patent ID: 7772960
Filing Date: 2010-08-10
Classification: G01L,H01C

Abstract:
1. A force sensing resistor (FSR) comprising: a first substrate having first and second electrically conductive traces on an inner surface, wherein the traces are electrically separated from one another; and a second substrate having a resistive layer on an inner surface; wherein the substrates are subjected to a biasing force such that during the biasing force the substrates are in contact with one another with the resistive layer contacting and electrically connecting the traces together with an electrical resistance that inversely depends on the biasing force; wherein while an external force is applied to one of the substrates in a direction toward the other substrate, the substrates contact one another with a total force which is the sum of the biasing force and the external force with the resistive layer contacting and electrically connecting the traces together with an electrical resistance that inversely depends on the total force; wherein the biasing force is present regardless of either the presence or absence of the external force.