System for real time finger surface pattern measurement
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United States of America Patent
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Feb 27, 2007
Grant Date -
Sep 4, 2003
app pub date -
Jun 8, 2001
filing date -
Jun 9, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
This invention relates to a system for measuring patterns in finger surfaces, the system comprising an array of sensor electrodes over which the surface is to be moved, and at least one stimulation electrode for providing a varying current or voltage between the stimulation electrode and the number of sensors through the surface. The stimulation electrode is positioned separately from the array of sensor electrodes and the system comprises a generator coupled to the stimulation electrode for applying a current or voltage with a varying amplitude or phase to the surface. The system comprises a measuring unit coupled to the sensor electrodes for, during the application of the current or voltage, measuring the impedance at the sensor electrodes in a time sequence and calculating values of predetermined characteristics of the surface and combining the calculated values for the sensor electrodes over the time sequence for generating a representation of the surface pattern.
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