公开(公告)号：US11798308B2

公开(公告)日：2023-10-24

申请号：US17448037

申请日：2021-09-17

Applicant: QUALCOMM Incorporated

Inventor： Jessica Liu Strohmann ,  Hrishikesh Vijaykumar Panchawagh ,  Nai-Kuei Kuo ,  Yipeng Lu ,  Ali Lopez ,  Kostadin Dimitrov Djordjev

IPC: G01N29/09 ,  G06V40/13 ,  H10K59/65 ,  B06B1/06

CPC classification number: G06V40/1306 ,  B06B1/0688 ,  H10K59/65 ,  B06B2201/70

Abstract: Some disclosed implementations include an ultrasonic sensor stack and an acoustic resonator. The acoustic resonator may be configured to enhance ultrasonic waves transmitted by the ultrasonic sensor stack in an ultrasonic frequency range that is suitable for ultrasonic fingerprint sensors. In some examples, the acoustic resonator may include one or more low-impedance layers residing between a first higher-impedance layer and a second higher-impedance layer. Each of the one or more low-impedance layers may have a lower acoustic impedance than an acoustic impedance of the first higher-impedance layer or an acoustic impedance of the second higher-impedance layer. At least one low-impedance layer may have a thickness corresponding to a multiple of a half wavelength at a peak frequency of the acoustic resonator. The peak frequency may be within a frequency range from 1 MHz. to 20 MHz.

公开(公告)号：US11823483B2

公开(公告)日：2023-11-21

申请号：US17448031

申请日：2021-09-17

Applicant: QUALCOMM Incorporated

Inventor： Jessica Liu Strohmann ,  Hrishikesh Vijaykumar Panchawagh ,  Nai-Kuei Kuo ,  Yipeng Lu ,  Ali Lopez ,  Kostadin Dimitrov Djordjev

IPC: G06V40/13 ,  H03H9/17 ,  G06F21/32

CPC classification number: G06V40/1306 ,  G06F21/32 ,  H03H9/17

Abstract: Some disclosed implementations include an ultrasonic sensor stack and an acoustic resonator. The acoustic resonator may be configured to enhance ultrasonic waves transmitted by the ultrasonic sensor stack in an ultrasonic frequency range that is suitable for ultrasonic fingerprint sensors. In some examples, the acoustic resonator may include one or more low-impedance layers residing between a first higher-impedance layer and a second higher-impedance layer. Each of the one or more low-impedance layers may have a lower acoustic impedance than an acoustic impedance of the first higher-impedance layer or an acoustic impedance of the second higher-impedance layer. At least one low-impedance layer may have a thickness corresponding to a multiple of a half wavelength at a peak frequency of the acoustic resonator. The peak frequency may be within a frequency range from 1 MHz. to 20 MHz.