| 摘要 |
PROBLEM TO BE SOLVED: To prevent degradation of sound quality by reducing restriction in reciprocal movement of a vibration system. SOLUTION: A loudspeaker device 1 forms a magnetic circuit by fixing magnets 12, 14 to a case 2 and inserts a voice coil bobbin 31 provided with a voice coil 33 in such a way as covering the magnets 12, 14. A pair of vibration control members 34, 35 is provided on an outer periphery holding the voice coil bobbin 31 so as to hold the first voice coil 33. The voice coil 33 is inserted in a magnetic flux concentration part 18, where magnetic fluid 20 is poured. The outer periphery of a diaphragm 32 fixed to the voice coil bobbin 31 is freely movably supported by the case 2 via magnetic fluid 20B. COPYRIGHT: (C)2011,JPO&INPIT
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