Second harmonic imaging transducers
US5825117A · kind A · utility
66Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Mar 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A harmonic imaging transducer is a structure of two mechanically coupled piezoelectric layers. This two-layer piezoelectric structure may vibrate either in a symmetric mode, wherein the two layers are expanding and contracting in unison, or in an anti-symmetric mode, wherein one layer is contracting while the other is expanding. Symmetric mode vibrations result in first harmonic operation, while anti-symmetric mode vibrations result in second harmonic operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.