Tdk Corporation

Invensense, Inc.

Xiaoyue Jiang

Mei-Lin Chan

Peter George Hartwell

Mamdouh Yanni

Bongsang Kim

Nikhil Apte

Leonardo Baldasarre

Chienliu Chang

Quy Chau

Emad Mehdizadeh

In a method for multipath reflection correction of acoustic signals received at an ultrasonic sensor, acoustic signals are received at the ultrasonic sensor over a time of flight range. Characteristics of multipath reflection signals of received acoustic signals are determined, wherein the characteristics of the multipath reflection signals of the received acoustic signals comprise a relationship of primary signal contributions to multipath reflection signal contributions for the acoustic signals received at the ultrasonic sensor at a plurality of times of flight for a plurality of locations of the ultrasonic sensor. The characteristics of the multipath reflection signals of received acoustic signals are compared to the received acoustic signals. The primary signal contribution and the multipath reflection signal contribution of the received acoustic signals is determined at a plurality of times of flight of the time range based on the characteristics of the multipath reflection signals of received acoustic signals.

Acoustic multipath correction

In a method for multipath reflection correction of acoustic signals received at an ultrasonic sensor, characteristics of multipath reflection signals of the ultrasonic sensor are accessed, wherein the characteristics of the multipath reflection signals include a relationship of primary signal contributions to multipath reflection signal contributions for acoustic signals received at the ultrasonic sensor at a plurality of times of flight for a plurality of locations of the ultrasonic sensor. Acoustic signals are received at the ultrasonic sensor over a time of flight range while a target is interacting with the ultrasonic sensor, wherein the acoustic signals include a primary signal contribution and a multipath reflection signal contribution. The characteristics of the multipath reflection signals are compared to received acoustic signals. The primary signal contribution of the received acoustic signals is determined at a plurality of times of flight of the time of flight range based on the characteristics of the multipath reflection signals.

Multipath reflection correction

A piezoelectric micromachined ultrasound transducer (PMUT) device may include a plurality of layers including a structural layer, a piezoelectric layer, and electrode layers located on opposite sides of the piezoelectric layer. Conductive barrier layers may be located between the piezoelectric layer and the electrodes to the prevent diffusion of the piezoelectric layer into the electrode layers.

Piezoelectric micromachined ultrasound transducer device with piezoelectric barrier layer

An ultrasonic sensor includes a two-dimensional array of ultrasonic transducers, wherein the two-dimensional array of ultrasonic transducers is substantially flat, a contact layer having a non-uniform thickness overlying the two-dimensional array of ultrasonic transducers, and an array controller configured to control activation of ultrasonic transducers during an imaging operation for imaging a plurality of pixels at a plurality of positions within the two-dimensional array of ultrasonic transducers. For imaging a pixel of the plurality of pixels, the array controller is configured to activate a first subset of ultrasonic transducers of the two-dimensional array of ultrasonic transducers to generate an ultrasonic beam directed to a contact surface of the contact layer, and activate a second subset of ultrasonic transducers of the two-dimensional array of ultrasonic transducers to receive a reflected ultrasonic beam, wherein the second subset of ultrasonic transducers is at a location within the two-dimensional array of ultrasonic transducers to account for a local angle between the two-dimensional array of ultrasonic transducers and the contact surface where the ultrasonic beam interacts with the contact surface.

Ultrasonic fingerprint sensor with a contact layer of non-uniform thickness

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San Jose, CA, United States of America

Xiaoyue Jiang