| 摘要 |
A miniature buzzer for a pocket pager and the like is provided. The buzzer includes a support member in the form of a cylindrical collar having a bore extending therethrough. The bore is stepped with the step defining a knife edge. A pole piece surrounded by a coil and ring magnet extends toward the step. The ring magnet and a central portion of the pole piece define a plane spaced apart from the step. A diaphragm, backed by a magnetic armature seats on the knife edge for attraction/repulsion toward/from the pole piece. The coil is driven by an oscillator extends from the collar. The assembly is contained within a housing the volume of which is also tuned to the oscillator.
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