Diaphragm for speaker
US5206466A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1991 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Mar 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/025
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A speaker diaphragm includes a combined fiber paper made with crushed silk chips and a crushed bast fiber. In the preferred embodiment, the bast fiber is a natural Manila hemp fiber. The silk fiber contributes vibration damping to the diaphragm while the bast fiber contributes strength and stiffness. The crushed silk chips and the crushed bast are mixed with water to produce a slurry from which the water is drained to produce the combined fiber paper. In a further embodiment of the invention, a layer of a different material is disposed between two layers of the combined filter paper. The layer of different material is selected from a hard wound silk gauze, a glass fiber, a polyamid fiber and a carbon fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.