Acoustic horn audio reproducer
US4922541A · kind A · utility
Inventor
Key dates
| Filing date | Aug 7, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Aug 7, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for audio reproduction, specifically, transduction of electrical signals into acoustic signals, or sound waves, which minimizes acoustic impedance matching problems and distortion by mounting a diaphragm inside the body of a horn having a mouth for passage of sound waves at the end of the horn on one side of the diaphragm and an open end at the end of the horn on the other side of the diaphragm. The diaphragm is mounted in a voice coil collar having a voice coil wound therearound, and smaller, secondary magnets are mounted to the collar on both sides of the diaphragm. The horn is provided with large, primary magnets on either side of the collar, and the orientation of the magnets causes the collar to be suspended at exactly the midpoint therebetween. When current is applied to the coil, the collar, carrying the diaphragm, reciprocates within the horn to produce sound waves out of the mouth of the horn, the open end at the other end of the horn acts to equalize air pressure within the horn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.