US 12,079,431 B1
Ultrasonic touch sensor with backlight
Klaus Elian, Alteglofsheim (DE); Derek Debie, Bogen (DE); and Fabian Streb, Regensburg (DE)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Sep. 13, 2023, as Appl. No. 18/466,476.
Int. Cl. G06F 3/043 (2006.01); B06B 1/02 (2006.01); B06B 1/06 (2006.01); F21K 9/64 (2016.01); F21V 9/40 (2018.01); F21V 23/04 (2006.01); F21Y 103/10 (2016.01); F21Y 107/90 (2016.01); F21Y 113/13 (2016.01); F21Y 115/10 (2016.01)
CPC G06F 3/0436 (2013.01) [B06B 1/0292 (2013.01); B06B 1/0666 (2013.01); F21K 9/64 (2016.08); F21V 9/40 (2018.02); F21V 23/0485 (2013.01); B06B 2201/55 (2013.01); F21Y 2103/10 (2016.08); F21Y 2107/90 (2016.08); F21Y 2113/13 (2016.08); F21Y 2115/10 (2016.08)] 25 Claims
OG exemplary drawing
 
1. An ultrasonic touch sensor, comprising:
a housing having a package cavity;
an ultrasonic transmitter arranged within the package cavity, wherein the ultrasonic transmitter is configured to transmit an ultrasonic transmit wave;
an ultrasonic receiver arranged within the package cavity, wherein the ultrasonic receiver is configured to receive an ultrasonic reflected wave produced by a reflection of the ultrasonic transmit wave and generate a measurement signal representative of the ultrasonic reflected wave;
a measurement circuit arranged within the package cavity and coupled to the ultrasonic receiver, wherein the measurement circuit is configured to detect a touch or a non-touch based on the measurement signal;
a light source configured to produce an activating light; and
a coupling medium that fills or at least partially fills the package cavity, wherein the coupling medium includes a luminescent material that is configured to be activated by the activating light to produce a backlight that is emitted from the package cavity.