Fingerprint identification device equipped with a touch...

G - Physics – 06 – K

Patent

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Details

G06K 9/20 (2006.01) G06K 9/00 (2006.01) G06K 9/03 (2006.01) G07C 9/00 (2006.01) H03K 17/96 (2006.01) A61B 5/117 (2006.01)

Patent

CA 2291204

A fingerprint identification device judges that the input fingerprint is identical to the fingerprint in the database only when a the touch sensor detects the human finger and a the fingerprint processing unit detects that the input fingerprint is identical to a fingerprint in the database. The touch sensor includes an oscillator that outputs a high frequency signal. An electrode unit applies the high frequency signal to the human finger. A detector unit detects a variation of impedance values varied by the human finger contracting the electrode unit and outputs an output signal based on the variation of impedance values. A discriminator unit determines whether the human finger is in contact with the electrode unit by comparing the output signal from the detector unit with a predetermined reference value.

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