• Patent Title: CAPACITIVE FINGERPRINT SENSING DEVICE AND METHOD FOR CAPTURING A FINGERPRINT USING THE SENSING DEVICE
  • Application No.: US15409803
    Application Date: 2017-01-19
  • Publication No.: US20170316243A1
    Publication Date: 2017-11-02
  • Inventor: Farzan Ghavanini
  • Applicant: Fingerprint Cards AB
  • Priority: SE1650592-7 20160502
  • Main IPC: G06K9/00
  • IPC: G06K9/00 G06F3/044
CAPACITIVE FINGERPRINT SENSING DEVICE AND METHOD FOR CAPTURING A FINGERPRINT USING THE SENSING DEVICE
Abstract:
There is provided a capacitive fingerprint sensing device for sensing a fingerprint pattern of a finger, the capacitive fingerprint sensing device comprising: a protective dielectric top layer having an outer surface forming a sensing surface to be touched by the finger; at least one electrically conductive sensing structure arranged underneath the top layer; readout circuitry coupled to the at least one electrically conductive sensing structure to receive a sensing signal indicative of a distance between the finger and the sensing structure; and a plurality of individually controllable electroacoustic transducers arranged underneath the top layer and configured to generate a focused ultrasonic beam, and to transmit the ultrasonic beam through the protective dielectric top layer towards the sensing surface to induce an ultrasonic vibration potential in a ridge of finger placed in contact with the sensing surface at the location of the ultrasonic beam.
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