Ceramic metal matrix diaphragm for loudspeakers
US7280668B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2002 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Jan 7, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides a method of manufacturing speaker diaphragm for a loudspeaker that has a composite material formed of two layers of ceramic material separated by a light metal substrate and where the core is formed by stamping a sheet of standard gauge aluminum to form a speaker core and then deep anodizing the core to obtain a ceramic layer of alumina on each surface (Al2O3) that is at least about 1 mil. thick. The invention further provides for a loudspeaker diaphragm, where the diaphragm is a composite material formed of at least two layers of ceramic material having a metal substrate therebetween and where the thickness of the metal substrate is no more than 86% of the thickness of the composite material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.