| 摘要 |
A compact receiver for a hearing aid is disclosed. According to one embodiment, the receiver includes a housing portion. A diaphragm having a plurality of peripheral edges is disposed within the housing portion and defines first and second acoustical chambers. One of the diaphragm peripheral edges is pivotally coupled to the housing. The remaining edges are compliantly coupled to the housing. An electromagnetic motor includes an armature. A compliant bond couples the armature to the diaphragm to move the diaphragm at frequencies in accordance with an electrical signal applied to the motor. First and second outlet ports extend through the housing. The first outlet port is acoustically coupled to the first chamber, and the second outlet port is acoustically coupled to the second chamber. The first and second outlet ports, in conjunction with the first and second chambers, cooperate to cancel low frequency sound, resulting in the receiver having a generally high-frequency band pass frequency response. In another embodiment, the first port is eliminated, resulting in the receiver having a generally broad band frequency response. In a still further embodiment, two of the broad band receivers are combined back-to-back, resulting in a receiver having twice the output amplitude as a single one of the receivers, while reducing vibration, as the respective armatures vibrate 180 DEG out-of-phase. A cerumen blocking boot is also disclosed for preventing entry of cerumen into the receiver sound port.
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