| 摘要 |
A magnetic circuit of a micro speaker is disclosed. A magnet and an upper plate are mounted upon a yoke part, and this structure is placed within upper and lower dies, leaving a gap. Then an injection molding is carried out by injecting a resin into the gap within the dies, so that a speaker frame is formed to unitizingly secure the yoke part, the magnet and the upper plate, thereby completing the magnetic circuit of the micro speaker. Thus the coupling between the components are made firm, and the product can be made slim.
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