Loudspeaker with phase correction
US5778084A · kind A · utility
Inventors
Key dates
| Filing date | Jan 24, 1997 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Jan 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns a loudspeaker with a diaphragm which is electromagnetically induced to vibrate and is made of a central dome-shaped part and a conical part surrounding the latter, and a phase-correction device, consisting of a cone fixed in the housing with its base side matching the shape of the diaphragm and of two rings surrounding the cone concentrically, between which there are sound paths from the diaphragm into the sound outlet area. The object of the invention is to smooth out the transmission characteristic of the loudspeaker named initially and to enlarge the transmissible frequency band with simple means. The invention is characterised in that the ring surrounding the cone covers the boundary area between the dome and the cone of the diaphragm and on the side facing the diaphragm consists of two essentially conical surfaces, in that the axes of the sound paths between the cone and the neighboring ring and between the two rings are each aligned on a point on the loudspeaker axis, in that the sound paths become broader as the distance from the diaphragm increases, and in that the distances from the middle of the underside of the cone and from the middle of the surfa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.