High-frequency loud speaker
US4473721A · kind A · utility
Inventor
Key dates
| Filing date | Mar 3, 1982 |
| Grant date | Sep 25, 1984 |
| Priority date | — |
| Expiry date | Mar 3, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A high-frequency loudspeaker has a movable diaphragm which is moved to and fro by an actuating unit. The actuating unit, under the impulses of a signal to be converted into sound waves, changes in dimension in at least two opposed directions. The diaphragm is made up of two rigid hemispherical shell diaphragms which are connected together through a resilient ring to constitute a pulsating, closed sphere. An actuating unit is disposed inside the sphere and is firmly connected to the two diaphragms, so that the forces emanating therefrom are imparted to the two diaphragms and in directions at right angles to the plane connecting between the two diaphragms. A device is provided for equalizing the atmospheric pressure within and outside the closed, spherical body. Instead of connecting the diaphragms through a ring it is also possible to have the diaphragms merge without contact through a labyrinthic seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.