Acoustic diaphragm for speakers and method of producing the same
US4300655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1980 |
| Grant date | Nov 17, 1981 |
| Priority date | — |
| Expiry date | May 20, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An acoustic diaphragm for speakers having a sandwich structure constituted by a core material comprising an elongated web material bent to have a plurality of radial projections, and upper and lower surface members adhered to the upper and lower edges of the core member, as well as a method of producing the same. The acoustic diaphragm of the invention has a reduced weight while exhibiting a large flexural rigidity so that the nodal line during the resonance vibration can have a circular form which in turn offers a circular form of nodal line and increased speaker power. Also, the method of producing the invention permits easy fabrication of the acoustic diaphragm having a sandwich structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.