Micro-electroacoustic Device
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United States of America Patent
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Issued Date -
Feb 27, 2014
app pub date -
Aug 27, 2013
filing date -
Aug 27, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A micro-electroacoustic device includes a vibrating unit and a magnetic circuit unit supporting the diaphragm. The vibrating has a diaphragm and a voice coil driving the diaphragm to vibrate along a vibration direction. The magnetic circuit unit has a base board, a first magnetic conduction member disposed on the base board, a second magnetic conduction member disposed on the base board and around the first magnetic conduction member, and a magnetic gap formed by the first and second magnetic conduction members. The base board having an air-leaking hole communicating outside with the magnetic gap for balancing the air pressure below the diaphragm during the vibration of the diaphragm. A projection of the diaphragm along the vibration direction on the base board being within an outline of the magnetic circuit.
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