Loudspeaker drive unit
US6219432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1999 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Jan 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2307/207
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker drive unit (1) comprises a diaphragm (2), a chassis member (3) and a surround (4) connecting the outer portion of the diaphragm to the chassis member in which (i) substantially all parts of the surround (4) located between the diaphragm (2) and the chassis member (3) and capable of radiating sound are arranged parallel or at an acute angle with respect to the longitudinal axis of the loudspeaker drive unit (1), or (ii) the surround is made of a body of foam material (30) arranged to be compressed against the chassis member (32) when the diaphragm (10) moves towards the chassis member, or (iii) the bending wave impedance of the surround (30) is matched to the bending wave impedance of the diaphragm (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.