Omnidirectional acoustic transducer
US4836328A · kind A · utility
Inventor
Key dates
| Filing date | Apr 27, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Apr 27, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/345
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An enclosure for a transduction element incorporates a geometrically shaped acoustically reflective shell. This acoustically reflective shell is shaped so that the inner surface thereof is at a least a section of that shape generated when a parabolic structure is rotated around a line which, lies in the plane of the parabolic structure, is perpendicular to the major axis of the parabolic structure. Such geomtrically generated shapes will have one distinct focal curve. A transduction element placed about this focal curve will, in operation, cause acoustic radiation to be produced which will be characterized by a plane wavefront of coherent radiation. Said device may alternately act as a transducer which produces a 360 degree beam width by placement of a plane wavefront producing transduction means at a position above the acoustically reflective shell and parallel to the plane of the distinct focal curve. Finally, by appropriate selection of transduction element and reflective shell composition, the device may operate as a transmitter or receiver of electromagnetic radiation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.