Asymmetrical moving systems for a piezoelectric speaker and asymmetrical speaker
US8594348B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2006 |
| Grant date | Nov 26, 2013 |
| Priority date | — |
| Expiry date | Jun 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R7/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A moving system (3) for a piezoelectric speaker (1) may include a membrane (4) and a piezoelectric layer (5) attached thereto, wherein a movement of the moving system (3) in a main direction (MD) is substantially caused by dilatation/contraction of the piezoelectric layer (5) transverse to the main direction (MD). To provide an advantageous frequency response of the moving system (3), it is built up asymmetrically with respect to the moving characteristics. Accordingly, the modes are frequency shifted on the one hand and of less influence on the other. Hence, the frequency response of an inventive speaker (1) has less elevations and depressions in the frequency response. In a preferred embodiment the local compliance and/or the shape of the moving system (3) is asymmetric with respect to any point in the plane of the moving system (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.