| 摘要 |
PROBLEM TO BE SOLVED: To provide a radial magnetic circuit for speaker apparatus in which the product cost can be reduced. SOLUTION: The magnetic circuit has a magnetic yoke including a columnar center pole, and a plurality of planar magnets arranged uniformly around the center pole and forming a magnetic gap to the center pole. Each magnet is magnetized in parallel with the thickness direction toward the center pole, and constitutes a radial magnetic circuit. Since each magnet is formed not arcuately but planarly, it can be machined easily and the man-hour required for forming the magnet can be reduced. Since each planar magnet is magnetized in the thickness direction, no special magnetization machine is required. Consequently, the man-hour required for magnetizing the planar magnet can be reduced. As a result, product cost of the magnetic circuit can be reduced. COPYRIGHT: (C)2008,JPO&INPIT
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