| 摘要 |
PURPOSE:To prevent a voice coil and a voice coil bobbin from being destroyed, by absorbing the heat produced from the voice coil located in a gap of a magnetic circuit through an electrothermo cooling element fitted to the magnetic circuit or voice coil. CONSTITUTION:A magnetic circuit of a speaker consists of a center pole 1, magnet 2 and plate 3. A thermo electric element 6 using the Peltier effect is fitted at the bottom 1a of the pole 1, and heat fin 7 is fitted to another surface of the element 6. The element 6 is formed by clipping the series connection of P type semiconductors 6p and n type semiconductors 6n with bonding plates 6a, with electric insulating plates 6b. Current is supplied to the element 6 so that the surface near the voice coil bobbin 4 of the element 6 can absorb heat. A voice coil 5 is wound on the bobbin 4 and the Joule heat in the coil 5 is transferred to the pole 1 and absorbed with the element 6. This absorbed heat is dissipated to the fin 7 for thermal radiation. As a result, the destruction of the coil 5 and bobbin 4 can be prevented. |
