Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having acoustic wave modifying structure
Patent
1997-11-06
1999-08-03
Le, Huyen
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having acoustic wave modifying structure
381398, 381407, 381430, H04R 2500
Patent
active
059335084
ABSTRACT:
A horn speaker system includes a dome-shaped diaphragm, a coil bobbin, a phase equalizer, and a magnetic circuit. The coil bobbin is integral with the dome-shaped diaphragm, and a voice coil is wound on the coil bobbin near a free end thereof. The magnetic circuit coacts with the voice coil for producing forces to actuate the dome-shaped diaphragm. The magnetic circuit includes a cylindrical magnet, a first annular yoke attracted to one end of the cylindrical magnet and having a central opening, a plate cooperating with the first yoke in defining a gap in which the coil bobbin is inserted, and a second yoke attracted to an opposite end of the magnet. The magnet, the first yoke, the first plate, and the second yoke jointly make up a closed magnetic circuit. The phase equalizer serves to keep sounds outputted from the dome-shaped diaphragm in phase. The phase equalizer is mounted on the first yoke and has a plurality of slits defined therein. The magnet, the first yoke, the phase equalizer, and the dome-shaped diaphragm are stacked coaxially with each other.
REFERENCES:
patent: 2164374 (1939-07-01), Barker
patent: 3665124 (1972-05-01), Sotome
patent: 3905448 (1975-09-01), Kawakami et al.
patent: 3991286 (1976-11-01), Henricksen
patent: 4525604 (1985-06-01), Frye
patent: 5148492 (1992-09-01), Uzawa et al.
Endo Katsuya
Fuke Nobuo
Kamatani Yoshiteru
Le Huyen
Sony Corporation
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