Patent ID: 7965281
Filing Date: 2011-06-21
Classification: G06F

Abstract:
1. A capacitance sensing apparatus comprising: a first plurality of capacitance sensor elements comprising first, second, third and fourth capacitance sensor elements that traverse a region, wherein a change in capacitance is induced in at least one of said capacitance sensor elements when an object is proximate to said region; and sensor circuitry having a first plurality of inputs comprising first, second, third and fourth inputs; wherein a comparison of a first measure of capacitance received at said first input and a second measure of capacitance received at said second input is used in setting a value of a first variable, said first and second measures respectively produced by said first and second capacitance sensor elements, and wherein a comparison of a third measure of capacitance sensed at said third input and a fourth measure of capacitance sensed at said fourth input is used in setting a value of a second variable, said third and fourth measures respectively produced by said third and fourth capacitance sensor elements; and wherein a position along an axis of said region corresponds to said value of said first variable and said value of said second variable.