US 11,860,272 B2
Ultrasonic touch sensor
Klaus Elian, Alteglofsheim (DE); Christoph Steiner, St. Margarethen a. d. Raab (AT); Horst Theuss, Wenzenbach (DE); Matthias Eberl, Taufkirchen (DE); and Fabian Merbeler, Munich (DE)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Nov. 8, 2022, as Appl. No. 18/053,583.
Claims priority of application No. 102021129855.5 (DE), filed on Nov. 16, 2021.
Prior Publication US 2023/0152448 A1, May 18, 2023
Int. Cl. G06F 3/043 (2006.01); G01S 15/08 (2006.01)
CPC G01S 15/08 (2013.01) [G06F 3/043 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ultrasonic touch sensor, comprising:
a housing;
a covering coupled to the housing, wherein an internal area is defined between the housing and the covering, and wherein the covering has a contact face configured to receive a touch;
a first ultrasonic transducer element arranged in the internal area and configured to transmit an ultrasonic transmit wave towards the covering, wherein a touch interface at the contact face of the covering is configured to reflect the ultrasonic transmit wave into the internal area as an ultrasonic reflected wave;
a first semiconductor chip comprising the first ultrasonic transducer element;
a second ultrasonic transducer element arranged in the internal area and configured to receive the ultrasonic reflected wave from the covering; and
an acoustic barrier formed between the first ultrasonic transducer element and the second ultrasonic transducer element, wherein the acoustic barrier is configured to reduce parasitic ultrasound waves originating from the ultrasonic transmit wave from reaching the second ultrasonic transducer element.