Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent
1989-08-07
1990-05-01
Ng, Jin F.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
381192, 381194, 381199, 381201, G10K 1102, H04R 906, H04R 1100, H04B 1300
Patent
active
049225413
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.
REFERENCES:
patent: 1568589 (1926-01-01), Eddington
patent: 2790164 (1957-04-01), Oberg
patent: 3016430 (1962-01-01), Hoodwin
patent: 4706295 (1987-11-01), Putnam et al.
patent: 4796009 (1989-01-01), Biersach
Byrd Danita R.
Ng Jin F.
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