| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized speaker where a thermal breaking of a voice coil due to an excess input is prevented and a large output is attained. SOLUTION: A center pole 22 is placed coaxially with a torus magnet 20, to which a torus plate 21 is fixed. Furthermore, a damper 29 and a diaphragm 30 are fitted to a voice coil bobbin, on which a voice coil 28 is wound to configure the speaker. A heat-collecting plate 33 is fixed to the upper part of the center pole 22 to absorb Jule heat from the voice coil 28. Then a heat pipe 34, made of copper or aluminum in which a trace of liquid is sealed at a critical pressure, is fitted to the lower part of the heat-collecting plate 33. The heat absorbed by the heat collecting plate 33 is delivered to a heat radiating fin 35 via the heat pipe 34, from which the heat is dissipated in air at a rear side of the speaker.
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