| 摘要 |
PURPOSE:To increase heat radiation ability and to drastically increase an allowable input quantity compared with the customary same one, and simultaneously, to improve workability by using an adhesive manufactured by mixing a ceramic powder for a voice coil. CONSTITUTION:A cylindrical bobbin 1 connected to a diaphragm is constituted of metal, paper and other proper materials. A wire 2 is wound around the proper places of the outer circumference of the bobbin 1. The adhesive 3 is a material which the ceramic powder of silicate is mixed in the base material of synthesized resin packed between the wires of the wire 2, and it may disperse and mix the ceramic powder beforehand in the ordinary adhesive for a wire winding. Besides, it may be mixed in the adhesive to be applied at the time when the wire 2 is wound around the bobbin 1. Besides, by covering the outer surface and/or the inner surface of the bobbin 1 with a ceramic layers 3a, 3b, heat generated in the voice coil is converted into a far infrared ray through the ceramic layer and the heat radiation ability of the voice coil is improved.
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