Loudspeaker having electrically conductive membrane transducers
US9924275B2 · kind B2 · utility
5Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2016 |
| Grant date | Mar 20, 2018 |
| Priority date | — |
| Expiry date | Feb 5, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved loudspeaker having pump cards that include an array of electrically conductive membrane transducers (such as polyester-metal membrane pumps). The array of electrically conductive membrane transducers combine to generate the desired sound by the use of pressurized airflow. The array of electrically conductive membranes has a total membrane area that is at least five times larger than the face area of the loudspeaker. In some embodiments, the loudspeaker includes a dynamic DC bus controller that maintains the DC bus level slightly above the inverter output (audio signal).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.