Ultrasonic transceiver including piezoelectric element and stacked layers of a plurality of matching layers, and ultrasonic flow meter having the ultrasonic transceiver
US12098938B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Jul 28, 2020 |
| Grant date | Sep 24, 2024 |
| Priority date | — |
| Expiry date | Jun 19, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There are provided piezoelectric element, case having conductivity, first acoustic matching layer bonded on case, and second acoustic matching layer stacked on and bonded to first acoustic matching layer. A joining part between first acoustic matching layer and second acoustic matching layer is located inside an outer periphery of a joining surface of first acoustic matching layer that is joined to second acoustic matching layer. This configuration can prevent indirect wave generated in first acoustic matching layer from propagating to second acoustic matching layer, and can therefore reduce reverberation of an ultrasonic wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.