公开(公告)号：US12056317B2

公开(公告)日：2024-08-06

申请号：US18469019

申请日：2023-09-18

Applicant: Infineon Technologies AG

Inventor： Costin Batrinu ,  Emanuel Stoicescu ,  Gheorghe-Iulian Chivu ,  Victor-Valentin Mocanu

IPC: G06F3/043 ,  G06F3/041

CPC classification number: G06F3/043 ,  G06F3/0416

Abstract: An ultrasonic touch sensor includes a touch structure including a touch surface configured to receive a touch, a signal generator configured to generate an excitation, a capacitive ultrasonic transmitter configured to transmit an ultrasonic transmit wave toward the touch structure based on the excitation signal while the touch surface is submerged under the water, a capacitive ultrasonic receiver configured to receive an ultrasonic reflected wave produced by a reflection of the ultrasonic transmit wave at the touch structure while the touch surface is submerged under the water and generate a measurement signal representative of the ultrasonic reflected wave, and a measurement circuit configured to perform a comparison based on the measurement signal and a threshold, and determine whether a no-touch event or a touch event has occurred at the touch surface while the touch surface is submerged under the water based on whether the measurement signal satisfies the threshold.

公开(公告)号：US12124655B2

公开(公告)日：2024-10-22

申请号：US18159817

申请日：2023-01-26

Applicant: Infineon Technologies AG

Inventor： Emanuel Stoicescu ,  Matthias Eberl ,  Costin Batrinu ,  Klaus Elian

IPC: G06F3/041 ,  G06F3/043 ,  G06F3/044

CPC classification number: G06F3/04186 ,  G06F3/043 ,  G06F3/044 ,  G06F2203/04105

Abstract: A touch sensor includes a touch structure including a touch interface and an inner interface arranged opposite to the touch interface; a capacitive ultrasonic transmitter arranged inside an enclosed interior volume and configured to transmit an ultrasonic transmit wave towards the touch structure; a capacitive ultrasonic receiver arranged inside the enclosed interior volume and configured to receive at least one ultrasonic reflected wave produced from the ultrasonic transmit wave via internal reflection; a coupling medium that fills an area between the inner interface and the capacitive ultrasonic receiver, wherein an external force applied to the touch interface is configured to impart an internal pressure onto the capacitive ultrasonic receiver through the coupling medium; and a sensor circuit configured to convert the at least one ultrasonic reflected wave into a measurement signal and detect the external force based on the measurement signal.

公开(公告)号：US12099685B2

公开(公告)日：2024-09-24

申请号：US18468999

申请日：2023-09-18

Applicant: Infineon Technologies AG

Inventor： Costin Batrinu ,  Gheorghe-Iulian Chivu ,  Emanuel Stoicescu

IPC: G06F3/043

CPC classification number: G06F3/0436 ,  G06F2203/04107

Abstract: An ultrasonic touch sensor includes a touch structure configured to receive a touch; a transmitter configured to transmit an ultrasonic transmit wave toward the touch structure; a receiver configured to receive ultrasonic reflected waves produced by a plurality of reflections of the ultrasonic transmit wave and generate a measurement signal representative of the ultrasonic reflected waves; and a measurement circuit configured to: acquire a first plurality of digital samples of the measurement signal during a first observation window that corresponds to a first ultrasonic reflected wave produced by a reflection of the ultrasonic transmit wave at the touch interface, acquire a second plurality of digital samples of the measurement signal during a second observation window that is subsequent in time to the first observation window, and determine whether a no-touch event or a touch event has occurred based on the first and the second plurality of digital samples.

公开(公告)号：US11768562B1

公开(公告)日：2023-09-26

申请号：US18168373

申请日：2023-02-13

Applicant: Infineon Technologies AG

Inventor： Ana-Maria Plaiseanu ,  Costin Batrinu

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/043

CPC classification number: G06F3/0418 ,  G06F3/0436

Abstract: A method for calibrating an ultrasonic touch sensor includes generating a sequence of excitation signals, including sweeping a signal parameter such that the signal parameter is set to different parameter values; sequentially transmitting the plurality of ultrasonic transmit waves based on the sequence of excitation signals; receiving a plurality of ultrasonic reflected waves; generating a plurality of measurement signals representative of the plurality of ultrasonic reflected waves, wherein each measurement signal corresponds to a respective ultrasonic reflected wave of the plurality of ultrasonic reflected waves; determining a cumulative signal energy for each measurement signal; determining which measurement signal out of the plurality of measurement signals has a highest cumulative signal energy; and configuring, for a touch detection operation, the signal parameter with the parameter value that corresponds to the measurement signal having the highest cumulative signal energy.