Loudspeakers
US6411723B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Jun 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2440/01
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A flat panel rectangular or elliptical loudspeaker has one or more anisotropic diaphragms 14, 15, made of double skinned fluted polypropylene copolymer (core flute) or corrugated cardboards having a longitudinal bending strength greater than the transverse bending strength. The diaphragm is vibrated by a driver unit 16 which comprises a magnet 17 and voice coil 18. In this version the magnet 17 is mounted on the rear diaphragm 15 and the voice coil 18 is mounted on the front diaphragm 14. The two diaphragms 14, 15 are mounted at their edges to a frame 11 with the driver unit 16 mounted in the space enclosed by the frame and the diaphragms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.