| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker with a high cooling effect and high resistance to input. SOLUTION: The speaker is provided with: a yoke 1 having a projected pole 1b at a bottom plate 1a; a voice coil bobbin 4 placed at the outer circumference of the pole 1b and on which a voice coil 5 is wound; a magnet 3 placed at the outside of the voice coil 5 and over the bottom plate 1a of the yoke 1; and a top plate 2 placed over the magnet 3 at a position where the magnetic flux of the magnet 3 passes the voice coil 5. A diaphragm 7 placed over the top plate 2 is vibrated. The top plate 2 is provided with a plate through-hole penetrating from its outer side face to its inner side face, and the pole 1b is provided with a pole through-hole penetrating to the inner side of the voice coil bobbin 4. COPYRIGHT: (C)2004,JPO
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