(57) A speaker (100, 700, 100A, 100B) includes a magnet main body (210, 810, 210A, 210B)
and a yoke (220, 230, 820, 830, 220A, 220B, 230A, 230B) magnetically linked to a first
magnetic pole of the magnet main body. The speaker also includes a diaphragm (400,
400A, 400B) having a vibratory section (410, 410A, 410B), an edge section (430, 430A,
430B), and a rising section (420, 420A, 420B) between the vibratory section and the
edge section. A magnetic body (300, 900, 300A, 300B) of the speaker is magnetically
linked to the yoke, facing the magnet main body and a voice coil (500, 500A, 500B)
is wound around the rising section of the diaphragm. The magnetic body includes an
inner shell (330, 330A, 330B), an outer shell (310, 310A, 310B) and a bridge section
(320, 320A, 320B) between the inner shell and the outer shell to cover the edge section
of the diaphragm. The inner shell of the magnetic body extends from the bridge section
along the rising section and the vibratory section of the diaphragm within the inner
shell. A magnetic gap (G) is formed between the inner shell of the magnetic body and
the magnet main body and the rising section passes through the magnetic gap.
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