Qualcomm Incorporated

Ali Lopez

Hrishikesh Vijaykumar Panchawagh

Kostadin Dimitrov Djordjev

Jessica Liu Strohmann

Yipeng Lu

Nai-Kuei Kuo

John Keith Schneider

Nicholas Ian Buchan

Chin-Jen Tseng

Ila Ravindra Badge

Camilo Perez Saaibi

Sumit Agrawal

Legardo Reyes

Bernard Herrera Soukup

Michelle Ma Thin Thin Htay Chan

Some disclosed examples pertain to an apparatus that can include a platen, a light source system, a receiver system, and an electromagnetic interference (EMI) shield. The light source system can include light source system circuitry, a light-emitting component, and a light guide component having a substantially uniform cross-section. The light-emitting component provides light to an area of the platen via the light guide component. The receiver system can include at least two receiver stack portions residing proximate on either side of the light guide component. The receiver system detects acoustic waves corresponding to a photoacoustic response of a target object proximate the area of the platen, to light emitted by the light source system. The EMI shield shields the receiver system from at least some of the EMI produced by the light source system circuitry. The light guide component conveys light through a portion of the EMI shield.

Compact photoacoustic sensor

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.

Apparatus with ultrasonic fingerprint sensor and one or more resonators, and related systems and methods

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Dublin, CA, United States of America

Ali Lopez