公开(公告)号：US11042721B2

公开(公告)日：2021-06-22

申请号：US16661487

申请日：2019-10-23

Applicant: FINGERPRINT CARDS AB

Inventor： Roy Hansen

IPC: G06K9/00 ,  G10K11/34 ,  G06K9/20

Abstract: The present disclosure relates to an ultrasonic fingerprint sensor comprising an array of ultrasonic transducers, one microcontroller unit (MCU) configured for obtaining a configuration of the transducers, and a plurality of parallel mixed-signal Application-Specific Integrated Circuits (ASIC), each configured to be communicatively connected with the MCU and for Analogue-Digital (AD) conversion of analogue signals from the transducers to digital data and comprising a respective data storage for storing said digital data. The sensor also comprises, for each of the mixed-signal ASICs, a plurality of parallel front-end ASICs, each configured to be communicatively connected with said mixed-signal ASIC and for controlling a respective group of the transducers in accordance with the obtained configuration.

公开(公告)号：US10896311B2

公开(公告)日：2021-01-19

申请号：US16716591

申请日：2019-12-17

Applicant: Fingerprint Cards AB

Inventor： Roy Hansen

IPC: G06K9/00 ,  G06F21/32 ,  G06F3/043 ,  B06B1/06

Abstract: An acoustic biometric imaging system for acquiring a fingerprint representation, comprising: a device member; a transmitter transducer having a first fundamental mode resonance frequency, coupled to the device member; drive circuitry; a receiver transducer having a second fundamental mode resonance frequency, coupled to the device member; receiver circuitry; and processing circuitry configured to: control the drive circuitry to provide an electrical excitation signal to the transmit transducer resulting in fundamental mode oscillation of the transmit transducer with a frequency spectrum having a peak frequency being higher than the first fundamental mode resonance frequency and the second fundamental mode resonance frequency; receive, from the receiver circuitry, an electrical sensing signal indicative of an acoustic reflection signal; and determine the fingerprint representation based on the sensing signal received from the receiver circuitry.