Electromagnetic transducer
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United States of America Patent
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Jun 30, 2015
Grant Date -
Jul 12, 2012
app pub date -
Dec 14, 2011
filing date -
Jan 7, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A multifunctional electromagnetic transducer includes a bracket, a vibrating unit including a magnetic circuit part receiving in the bracket, and a plurality of helical wound springs assembled to the bracket for sustaining the magnetic circuit part. The magnetic circuit part defines a pole plate, a first magnet disposed at a center portion of the pole plate, and a plurality of second magnets surrounding the first magnet and forming a magnetic gap corporately with the first magnet. Each of the second magnets forms a receiving gap corporately with an adjacent second magnet. A voice coil is partially inserted into the magnetic gap.
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