| 摘要 |
A diaphragm has a back plane which has a voice coil attached thereto, and a front plane which is located on the side opposite to the back plane. The diaphragm also includes a center portion, a boundary portion which surrounds the center portion and has the voice coil attached thereto, an outer circumferential portion which surrounds the boundary portion, and an edge which surrounds the outer circumferential portion. A frame has a support portion which supports the back plane of the diaphragm. The outer circumferential portion has a convex shape which protrudes in the thickness direction extending from the front plane to the hack plane with respect to the edge.
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