| 摘要 |
A miniaturized electromechanical transducer has magnets providing polarizing flux across a working gap, an electrical signal coil, an armature extending through the coil and into the working gap, and a casing of particular configuration. The casing comprises a sleeve of magnetic material, elongate in the direction of its axis, which substantially surrounds the armature, coil, and magnets, said sleeve providing a substantially uninterrupted high permeability path between the magnets.
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