Ultrasonic touch sensor with active feedback
US11886668B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2022 |
| Grant date | Jan 30, 2024 |
| Priority date | — |
| Expiry date | Oct 7, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0418
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch sensor includes: a transmitter configured to transmit an ultrasonic transmit wave towards a touch structure; a receiver configured to receive an ultrasonic reflected wave produced from the ultrasonic transmit signal being at least partially reflecting by the touch structure; a receiver circuit configured to convert the ultrasonic reflected wave into a measurement signal; the receiver circuit configured to generate an error value representative of a difference between a measured value of the measurement signal and a reference value; a programmable voltage source configured to provide a bias voltage to the transmitter or to the receiver; a controller configured to adjust the bias voltage based on the error value; a measurement circuit configured to measure the DC bias voltage and determine whether a no-touch event or a touch event has occurred at the touch structure based on at least one measurement of the bias voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.