| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice coil in which danger for a wire winding part to be disconnected or to come off from a voice coil bobbin is remarkably reduced even if wire binding is loosened by thermally destroying resin coating of a wire wound around the voice coil bobbin because of heating of the voice coil with a great input. SOLUTION: A thread winding part 23, 231 or a reinforcing wire winding part 24, 241 is formed by winding a heat resistant fiber thread 23A or a reinforcing wire 24A around a voice coil bobbin 21 in contact with both coil ends of a wire winding part 22 or a coil end of the same on a magnetic-circuit side. Further, a bent part 24A which is bent outward, is formed on the lower end of the voice coil bobbin 21 on the magnetic circuit side. This prevents the wire winding part 22 from shifting from its mounting position and from coming off to the lower side. In a resulting voice coil 210, 211, the wire winding part 22 hardly disconnects or comes off from the voice coil bobbin 21 even if the wire binding of the wire winding part 22 is loosened by Joule heat, speaker vibrations, etc. COPYRIGHT: (C)2007,JPO&INPIT
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