| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology related to a speaker magnetic circuit capable of increasing the magnetic flux density inside the magnetic gap. SOLUTION: The speaker magnetic circuit comprises an annular magnet 12, an annular magnet 13 arranged around the annular magnet 12, and a magnetic body 31 for connecting the annular magnets 12 and 13. The magnetic body 31 has a cylindrical portion 31a, connected to the interior peripheral wall surface of the annular magnet 12, a cylindrical portion 31b connected to the exterior peripheral wall surface of the annular magnet 13, and a doughnut disc portion 31c connected to a lower part of the cylindrical portion 31a and a lower part of the cylindrical portion 31b. A connecting portion of the cylindrical portion 31b with the annular magnet 13 projects toward the annular magnet 13 side. COPYRIGHT: (C)2008,JPO&INPIT
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