Loudspeaker
US7123738B1 · kind B1 · utility
14Cited by
12References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 3, 2000 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Dec 19, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to a speaker using lightweight, highly rigid diaphragm having excellent frequency characteristic and improving resistance to environment (including resistance to UV and resistance to fading). For this end, the speaker utilizes a cone-shaped diaphragm made from foamed or cellular resin such as polyethylene terephthalate (PET) resin or polyethylene naphthalate (PEN) resin with 30 μm average cell size. The use of such cone-shaped diaphragm is effective to improve sound quality of the speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.