| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice coils for speakers which is used in various acoustic apparatus or the like and is superior in practicality to realize a speaker which has the sound pressure improved and has excellent sound pressure frequency characteristics up to a high band. SOLUTION: An aluminum wire 20b is used as a core material of a magnet wire 20a constituting a voice coil 20, and a galvanizing treatment layer 20c for improving the corrosion resistance is formed on the wire 20b, and a nonmagnetic metal plating treatment layer 20d for improving solderability is provided on the layer 20c. Thus a voice coil which is light-weight and is superior in corrosion resistance and mass productivity can be provided to contribute to high performance of speakers. COPYRIGHT: (C)2005,JPO&NCIPI
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