| 摘要 |
A speaker includes a frame, a yoke located at a bottom side of the frame, a magnet disposed in the yoke, a washer disposed in the yoke and arranged on the magnet, a voice coil and a diaphragm. The yoke includes a bottom wall and an annular sidewall extending upward from a peripheral edge of the bottom wall. The bottom wall and the sidewall cooperatively define a receiving chamber. The sidewall defines a groove in an inner circumferential surface around an axis of the yoke. Outer peripheral surfaces of the magnet and the washer, and the inner circumferential surface of the sidewall of the yoke, cooperatively define an annular air gap. The voice coil encloses the washer. A bottom end of the voice coil is interposed into an upper portion of the air gap. The diaphragm is supported by the frame and is connected to the voice coil.
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