Speaker diaphragm, speaker dust cap, speaker sub-cone, speaker using these components, and electronic apparatus using the same
US8199964B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2007 |
| Grant date | Jun 12, 2012 |
| Priority date | — |
| Expiry date | Sep 30, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker of high sound quality is achieved by improving rigidity of a material used for a diaphragm, a dust cap and a sub-cone. The diaphragm, the dust cap and the sub-cone of the loudspeaker are made of a paper beaten with the material containing bamboo fibers obtained from a bamboo tree aged one year or older, of which the fibers are finely beaten to an extent of micro-fibrillated form. The diaphragm and the dust cap are also made with a beaten paper containing at least 2 wt % of “A fibers” having stems of no greater than 30 μm in diameter, and surfaces of the stems are fibrillated into shaggy branches having diameters of 1 μm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.