Moving voice coil loudspeaker, peripheral diaphragm support, diaphragm construction, bobbin to diaphragm reinforcement
US4384174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1980 |
| Grant date | May 17, 1983 |
| Priority date | — |
| Expiry date | Oct 2, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The diaphragm of a speaker is supported by a viscous supporting member placed in an annular gap defined between the periphery of the diaphragm and the inner surface of a frame structure and by a conventional damper. Grooves may be made in the periphery of the diaphragm and in the inner surface of the frame structure for receiving some portions of the viscous supporting member. In another embodiment, a film made of a resin is welded to the front surface of a diaphragm body which is made of a foam resin. In other embodiments, one or more reinforcing members are fixedly adhered to both the voice coil bobbin and the flat rear surface of the diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.