Audio speaker utilizing an unanchored magnet for primary...

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic

Reexamination Certificate

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C381S413000

Reexamination Certificate

active

11282335

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.

REFERENCES:
patent: 3906171 (1975-09-01), Braceley
patent: 4300022 (1981-11-01), Hastings-James et al.
patent: 4964482 (1990-10-01), Meyer
patent: 5917288 (1999-06-01), Feldman et al.
patent: 7132597 (2006-11-01), Hosler
patent: 2003/0003879 (2003-01-01), Saiki et al.
patent: 2004/0184631 (2004-09-01), Hosler
patent: 2005/0105758 (2005-05-01), Tsuda

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