Patent ID: 7952567

Claim:
A touch sensor, comprising: a substrate having a resistive surface bounded by four peripheral edges that terminate at four corners, said resistive surface having a touch region interior to said edges; a single series resistor chain proximate each peripheral edge for creating electric fields across said touch region, said resistor chain comprising a plurality of conductive electrodes arranged in series with resistive regions of said resistive surface to form overlap resistors therebetween, each electrode including an outer portion in step connection with an inner portion such that said inner portion is closer to said touch region than said outer portion and wherein inner portions of electrodes are parallel to, and separated by said resistive regions from, outer portions of adjacent electrodes, said inner portions of adjacent electrodes being separated by junctions, the series resistor chain electrically connected at a corner of the resistive surface; a linear array of insulating regions in said resistive surface between said touch region and parallel to said single series resistor chain, said insulating regions being separated by gaps, at least one of said gaps formed between said touch region and at least one junction forming a junction gap; and an electrically conductive island located within said at least one junction gap.