Scanning capacitive semiconductor fingerprint detector
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United States of America Patent
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-
Jun 17, 2003
Grant Date -
Nov 22, 2001
app pub date -
Jun 8, 2001
filing date -
Jan 13, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A scanning fingerprint detection system includes an array of capacitive sensing elements, the array having a first dimension greater than the width of a fingerprint and a second dimension less than the length of a fingerprint. Each of the capacitive sensing elements has first and second conductor plates connected across an inverting amplifier, the conductor plates forming capacitors with the ridges and valleys of a fingerprint of a finger pressed against a protective coating above the array, the inverting amplifier generating a signal indicative of a ridge or valley. Circuitry is provided for scanning the array to capture an image of a portion of fingerprint and for assembling the captured images into a fingerprint image.
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