Ultrasonic sensor
US12038541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2022 |
| Grant date | Jul 16, 2024 |
| Priority date | — |
| Expiry date | Sep 2, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2015/938
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic sensor includes an adhesion sensor including a variable capacitance and a fixed capacitance. The variable capacitance includes a sensor electrode provided on a first surface of a bottom having a microphone installed thereon and a capacitance value thereof changes in accordance with adhesion of foreign matter on the first surface. The fixed capacitance includes a first electrode connected to the sensor electrode, and a second electrode provided on a member different from a microphone housing and disposed facing the first electrode. The adhesion sensor further includes an adhesion detecting section that is connected to the sensor electrode via the fixed capacitance and detects adhesion of foreign matter to the first surface by supplying an alternating-current signal to the fixed capacitance and the variable capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.