Patent ID: 8581604
Filing Date: 2013-11-12
Classification: G01L,G06F

Abstract:
1. A device for determining impedance of depression, comprising: a sensor including a plurality of conductive stripes constituting a plurality of intersecting regions, wherein a pair of conductive stripes intersected in an intersecting region form a contact point due to electrical contact so as to define a depressed intersecting region; a driver for providing a high potential and a low potential; a detector for detecting a signal of at least one conductive stripe; a selector for operatively coupling the conductive stripes with the driver and the detector; and a controller for controlling the driver, the detector, and the selector to determine a contact impedance, wherein the contact impedance of each depressed intersecting region is determined based on the potentials at the contact point of one and the other of the pair of conductive stripes or the position of the depressed intersecting region, wherein determination of contact impedance comprises: determining a first dimensional impedance and a second dimensional impedance based on the position of the depressed intersecting region; detecting a first contact potential and a second contact potential of one and the other of the pair of conductive stripes at the contact point when high and low potentials are provided to one and the other of a pair of conductive stripes, respectively; and determining the contact impedance based on the first dimensional impedance, the second dimensional impedance, the high potential, the low potential, the first contact potential, and the second contact potential; wherein the contact impedance is (R