Audio speaker utilizing an unanchored magnet for primary force generation
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United States of America Patent
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Nov 22, 2011
Grant Date -
Jan 8, 2009
app pub date -
Jul 18, 2008
filing date -
Dec 20, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A speaker apparatus has a container holding a volume of ferrofluid, a permanent magnet suspended in the ferrofluid, and a magnetic excitation apparatus proximate the container. Operation of the excitation apparatus causes movement of the permanent magnet, translated through the ferrofluid to walls of the container, which walls act as resonators creating sound waves in surrounding medium. Audio production is accomplished placing a ferrofluid and a permanent magnet in a container, placing an excitation apparatus in proximity of the permanent magnet, and driving the excitation apparatus to cause movement of the permanent magnet translated through the ferrofluid to walls of the container, which walls act as resonators creating sound waves in surrounding medium.
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