Planar diaphragm loudspeakers with non-uniform air resistive loading for low frequency modal control
US6760462B1 · kind B1 · utility
17Cited by
16References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 9, 2003 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Jan 9, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R7/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker, and particularly, a woofer, including a flat diaphragm transducer having at least one stator plate for carrying magnetic elements in close proximity to a low stiffness diaphragm wherein a piston-like motion of the diaphragm is achieved by creating pressure zones adjacent the diaphragm to improve an acoustic coupling and increase acoustic output for a given size of diaphragm by the provision of non-uniformly spaced openings in the at least one stator plate which are selectively spaced to control low frequency diaphragm resonance modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.