| 摘要 |
PCT No. PCT/GB96/02148 Sec. 371 Date May 13, 1998 Sec. 102(e) Date May 13, 1998 PCT Filed Sep. 2, 1996 PCT Pub. No. WO97/09858 PCT Pub. Date Mar. 13, 1997A vibration transducer adapted to be mounted on and launch bending waves into a member having opposed faces by applying a localized couple to the member. Also disclosed is a loudspeaker having such a transducer mounted on a member which acts as an acoustic resonator by sustaining resonant mode bending wave vibrations. The transducer comprises a motor coil assembly having a coil rigidly fixed to a tubular member, and a magnet assembly comprising opposed pole pieces, the periphery of one pole piece being disposed within and adjacent to the motor coil assembly, and the periphery of the other pole piece being disposed outside of and adjacent to the outside of the motor coil assembly. The magnet assembly has a central attachment portion adapted to be rigidly attached to the member to be vibrated. The motor coil assembly surrounds and is spaced from the central attachment portion of the magnet assembly, and has a surrounding attachment portion that is adapted to be rigidly fixed to one face of the member in spaced relation to the central attachment portion of the magnet assembly.
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