Importance

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Abstract

This invention relates to a sensor module for measuring structures in a surface, especially in a finger surface being moved over the sensor module, that includes a number of sensor elements, and an outer electrode located aside the sensor elements, the sensor elements being coupled to at least one AC drive circuit providing a varying current or voltage, thus coupling a signal through the sensor elements to the outer electrode.The sensor elements are also coupled to an electronic circuit positioned on a substrate, the substrate includes conductor leads coupling the sensor elements to the electronic circuit, and the electronic circuit being adapted to measure the magnitude of the capacitance or AC impedance.

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First Claim