Self-cooled loudspeaker

Details Self-cooled loudspeaker Self-cooled loudspeaker

1998-03-26

1999-06-01

Dang, Khanh

Acoustics

Diaphragm and enclosure

Reflex baffle

381397, H05K 500

Patent

active

059090154

ABSTRACT:
A self-cooling loudspeaker comprises a speaker frame, a diaphragm connected to the speaker frame, a voice coil connected to the diaphragm and a permanent magnet assembly having a central opening. The permanent magnet assembly comprises a permanent magnet disposed between a top plate and a bottom plate. A pole piece is disposed co-axially within the central opening of the permanent magnet assembly to form an air gap between the pole piece and the permanent magnetic assembly into which the voice coil is disposed. In one embodiment of the present invention, the top plate is stamped to form a plurality of intake air paths in communication with the air gap and a plurality of outtake air paths in communication with the air gap, the plurality of intake air paths having a decreasing cross-sectional area towards the central opening of the permanent magnet assembly, and the plurality of outtake air paths having an increasing cross-sectional area towards the central opening of the permanent magnet assembly. In use, the diaphragm moves linearly to produce sound, the linear movement of the diaphragm creating a unidirectional flow of air through the plurality of intake and outtake air paths. In a second embodiment of the present invention, the bottom plate is also stamped to form additional intake air paths in communication with the air gap and additional outtake air paths in communication with the air gap.

REFERENCES:
patent: 4210778 (1980-07-01), Sakurai et al.
patent: 4757547 (1988-07-01), Danley
patent: 5042072 (1991-08-01), Button
patent: 5357586 (1994-10-01), Nordschow et al.
patent: 5497428 (1996-03-01), Rojas

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