Ultrasonic sensor
US12140713B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2021 |
| Grant date | Nov 12, 2024 |
| Priority date | — |
| Expiry date | Feb 2, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic sensor includes a first electrode, a second electrode, and a third electrode. The first electrode is provided an ultrasonic microphone that includes a vibration element that provides a function for converting between mechanical vibrations and electrical signals. The second electrode is externally from the ultrasonic microphone such that an electrical characteristic between the second electrode and the first electrode changes based on an adhesion state of substances adhering to the ultrasonic microphone. The third electrode is provided so as to suppress changes in the electrical characteristic between the first electrode and the second electrode caused by factors other than the adhesion of substances adhering to the ultrasonic microphone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.