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Self-cooled loudspeaker
| Details |
Inventors: Yamamoto, Shuji; Plourde, Richard G.;
Assignee:
Primary Examiner: Dang; Khanh
Assistant Examiner:
Attorney, Agent or Firm: Kriegsman & Kriegsman
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. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a new and improved loudspeaker.
It is another object of the present invention to provide a loudspeaker which utilizes air flow to prevent significant temperature rise in the voice coil.
It is yet another object of the present invention to provide a loudspeaker of the type described above which produces air flow to prevent significant temperature rise in the voice coil through the natural vibratory motion of the loudspeaker diaphragm during normal operation.
It is still another object of the present invention to provide a loudspeaker of the type described above which is designed to prevent magnetized particles from moving in towards the voice coil of the loudspeaker.
It is another object of the present invention to provide a loudspeaker of the type described above which has a limited number of parts, which is inexpensive to manufacture and which is easy to use.
Accordingly, there is provided a self-cooling loudspeaker comprising a speaker frame, a diaphragm connected to said speaker frame, said diaphragm being capable of linear movement, a voice coil connected to said diaphragm, a permanent magnet assembly having a central opening, a pole piece disposed co-axially within the central opening of said permanent magnet assembly to form an air gap between said pole piece and said permanent magnetic assembly into which said voice coil is disposed, and at least one intake air path formed in said permanent magnet assembly in communication with the air gap, said at least one intake air path having a decreasing cross-sectional area towards the central opening of said permanent magnet assembly, wherein linear movement of said diaphragm produces a unidirectional flow of air through said at least one intake air path.
Various other features and advantages will appear from the description to follow.
In the description, reference is made to the accompanying drawings which form a part thereof, and in which is shown by way of illustration, specific embodiments for practicing the invention
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