VOICE COIL BOBBIN AND VOICE COIL USING THE SAME, AND LOUDSPEAKER

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PROBLEM TO BE SOLVED : To efficiently radiate a Joule heat generated in a coil, and to improve heat resistance and durability at a large input, even in a loudspeaker having a magnetic circuit that uses a rare-earth magnet and a small bore. SOLUTION : A voice coil bobbin has a cylinder body winding the coil on it, and an extending body, bent and extended in the internal direction or the external direction different from the extending direction of the cylinder body from one end of the cylinder body. The cylinder body and the extending body are molded integrally of a non-magnetic metal, and a film containing metallic-oxide fine powder is formed on the internal surface and/or external surface of at least the extending body. COPYRIGHT : (C)2007, JPO&INPIT