| 摘要 |
A speaker includes: a magnetic circuit; a voice coil bobbin; a voice coil; a diaphragm; a frame to which the outer circumference of the diaphragm is connected via a suspension; and a spider to support the center area of the diaphragm. A magnet unit, a pole piece, a pole piece, and a yoke are included in the magnetic circuit. The yoke has a ring shape with a center opening, and is disposed at the rear of the magnet unit. The magnet unit has a ring structure having a plurality of empty portions arranged equiangularly, and the spider includes a main body and a plurality of legs extending radially outwardly from the main body and is disposed inside the magnetic circuit such that distal end tips of the legs pass beyond the inner diameter of the ring structure of the magnet unit.
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