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Fingerprint sensors and systems incorporating fingerprint sensors

  • US 10,223,851 B2
  • Filed: 02/04/2016
  • Issued: 03/05/2019
  • Est. Priority Date: 07/19/2010
  • Status: Active Grant
First Claim
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1. A method of operating an access control system, the method comprising:

  • recording fingerprint data corresponding to one or more fingers of a particular authorized person;

    recording a sequence of angular finger positions for the particular authorized person;

    providing a fingerprint sensor and a plurality of drive signal injection points at least partially surrounding the fingerprint sensor, wherein each drive signal injection point corresponds to a different angular position around the fingerprint sensor and each drive signal injection point is configured to provide a unique drive signal;

    receiving a series of fingerprint signals from the fingerprint sensor, wherein each fingerprint signal corresponds to at least one drive signal coupled to the fingerprint sensor through a finger contacting both the fingerprint sensor and the at least one drive signal injection point corresponding to the at least one drive signal whereby the at least one drive signal is transferred from the corresponding drive signal injection point to the fingerprint sensor through the finger;

    if the series of fingerprint signals corresponds to the recorded fingerprint data and the recorded sequence of angular finger positions, then providing an authorization signal, wherein the angular finger position of each fingerprint signal is determined by determining the at least one drive signal to which that fingerprint signal corresponds.

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