Electromagnetic driving unit for a loudspeaker assembly
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United States of America Patent
Stats
-
Jul 10, 2007
Grant Date -
Jul 28, 2005
app pub date -
Mar 20, 2003
filing date -
Apr 25, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electromagnetic driving unit includes a magnet part and a coil part that is translatable along a translation axis with respect to the magnet part. A diaphragm extends from the coil part in a substantially radial direction with respect to the translation axis of the coil part. The magnet part includes two permanent magnets and an intermediate magnetic pole element that is sandwiched between the permanent magnets when viewed along the translation axis of the coil part. In order to improve the efficiency of the driving unit, the permanent magnets and the intermediate magnetic pole element are sandwiched between two external magnetic pole elements, and all pole elements have pole faces that are magnetically directed towards the coil part.
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