| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker having a through-hole perforated through a magnetic circuit, thereby enabling air to be exhausted or inlet, and restraining a voice coil temperature from rise even when mounted in a cabinet of a small capacity. SOLUTION: The air in a voice coil bobbin 11 in a gap 14 of a magnetic circuit 2 having been warmed by a voice coil is exhausted to, or external air is inlet from, a front face side of a vibrating cone 8 through a through-hole 24 perforated through a center pole 3, a cap 25 for forming a path, a path 31 formed inside a lower plate 4, a through-hole 15 perforated through the lower plate 4, the gap 14, and an air-permeable damper 10. Thus, the temperature rise of a voice coil 9 is restrained. COPYRIGHT: (C)2004,JPO&NCIPI
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