MANUFACTURING METHOD OF BOTTOM PLATE FOR SPEAKER, BOTTOM PLATE FOR SPEAKER MANUFACTURED THEREBY, AND SPEAKER USING THE BOTTOM PLATE FOR SPEAKER

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a bottom plate for a speaker available for various acoustic devices which allows a decrease in the number of manufacturing processes and allows production of speakers of high quality and stability at assembling of speakers. SOLUTION: In the manufacturing method of the bottom plate for a speaker, magnetic metal materials and non-magnetic metal materials are injected into the same mold for molding. By utilizing a difference in melting points and specific gravities of these materials, a cap of non-magnetic metal material is integrally formed with the bottom plate for a speaker at a tip portion of a center pole. COPYRIGHT: (C)2009,JPO&INPIT