Patent ID: 7283651
Filing Date: 2007-10-16
Classification: G06K

Abstract:
1. Sensor chip for measuring structures in a finger surface and including an electronic chip being provided with a number of interrogation electrodes for capacitance measurements, said sensor chip comprising: a first electrically conductive layer, said first electrically conductive layer comprising sensor points defining positions of sensors in the sensor chip, said sensor points being coupled to the interrogation electrodes in the electronic chip, a first dielectric layer substantially covering the first electrically conductive layer, and an outer electrically conductive layer for electric contact with said structures in said finger surface, said outer electrically conductive layer comprising openings formed therein at least over the sensors points, the electronic chip thus being adapted to measure the capacitance between the outer electrically conductive layer and said interrogation electrodes through the sensor points, and wherein the sensor points form an essentially linear array with at least one sensor being adapted to measure relative movement between the array and the finger surface.