ACOUSTIC BIOMETRIC TOUCH SCANNER
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Accused Products
Abstract
An acoustic biometric touch scanner device and method is disclosed. In one aspect, an acoustic fingerprint sensing device includes an array of ultrasonic transducers configured to transmit an ultrasound signal having a frequency in a range from 50 megahertz (MHz) to 500 MHz. The acoustic fingerprint ultrasonic transducers include a piezoelectric film. The acoustic fingerprint sensing device further includes a receiving surface configured to receive a finger. The acoustic fingerprint sensing device further includes a processor configured to generate an image of at least a portion of a fingerprint of the finger based on a reflection of the ultrasound signal from the finger.
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Citations
30 Claims
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1. (canceled)
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2. An ultrasonic fingerprint sensing device comprising:
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a surface configured to receive a finger; an array of ultrasonic transducers configured to transmit an ultrasound signal through the surface to the finger, the ultrasound signal having a frequency that is sufficiently high to achieve at least a 500 pixels per inch resolution with beamforming, and the frequency of the ultrasound signal being sufficiently low to allow the ultrasound signal to penetrate tissue of the finger; electrodes configured to address the ultrasonic transducers of the array; and a processor in communication with the ultrasound transducers of the array, the processor configured to generate an image of at least a portion of the finger based on a reflection of the ultrasound signal from the finger and to authenticate the finger based on the image, wherein the image has a resolution of at least 500 pixels per inch, and wherein the ultrasonic fingerprint sensing device is configured to perform transmit focusing on a selected portion of the surface. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An ultrasonic fingerprint sensing device comprising:
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a surface configured to receive a finger; ultrasonic transducers configured to transmit an ultrasound signal through the surface to the finger; and a processor in communication with the ultrasound transducers, the processor configured to generate an image of at least a portion of the finger based on a reflection of the ultrasound signal from the finger, to detect a liveness parameter associated with liveness of the finger based on the reflection, and to authenticate the finger based on the image and the liveness parameter; wherein the ultrasonic fingerprint sensing device is configured to perform transmit focusing on a selected portion of the surface. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method of authenticating a finger, the method comprising:
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transmitting, using one or more ultrasonic transducers, an ultrasound signal to a finger in contact with a surface, wherein the transmitting comprises transmit focusing on a selected portion of the surface; receiving a reflection of the ultrasound signal from the finger; and generating an image of at least a portion of the finger based on the reflection of the ultrasound signal from the finger; detecting a liveness parameter associated with liveness of the finger based on the reflection; and authenticating the finger based on the image and the liveness parameter. - View Dependent Claims (27, 28, 29, 30)
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Specification