| 摘要 |
An electromagnetic transducer is described including a magnet assembly ( 50 ) and a conductive drive coil ( 52 ). The magnet assembly provides an emanating magnetic field within which the drive coil is located. The drive coil is a flat ring coil having a width that is equal to or greater than its height. As assembled, the drive coil is mounted in close proximity to the magnet assembly such that relative axial motion may occur between them during use. In one embodiment, the magnet assembly includes two permanent disc magnets ( 64 ), ( 66 ) having axial magnetizations and being oriented with like poles facing one another to produce a radially emanating magnetic field. In another embodiment, the magnet assembly includes a pair of axially magnetized permanent ring magnets ( 64 ), ( 66 ) also oriented with like poles facing one another.
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