| 摘要 |
PROBLEM TO BE SOLVED: To provide a loudspeaker apparatus which can be made thin and compact and has high input resistance and high sound quality. SOLUTION: The loudspeaker apparatus has an external magnetic type repulsing magnetic circuit 1, a frame 2 and a vibrating body 3. The external magnetic type repulsing magnetic circuit 1 is constituted so that a plate 11 formed in a nearly annular shape is held between magnets 12 and 13 formed in a nearly annular shape and disposed having the polarities opposed to each other. The vibrating body 3 has a diaphragm 21, a voice coil 24 and a voice coil bobbin 23. The frame 2 supports the vibrating body 3 and external magnetic type repulsing magnetic circuit 1. In this speaker apparatus, the voice coil bobbin 23 is formed nearly cylindrically. Further, a heat dissipation body 4 is loosely inserted into the voice coil bobbin 23. COPYRIGHT: (C)2009,JPO&INPIT
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