Ferrofluid centered voice coil speaker

Details Ferrofluid centered voice coil speaker Ferrofluid centered voice coil speaker

2007-01-30

2010-06-01

Ni, Suhan (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S396000, C381S414000

Reexamination Certificate

active

07729504

ABSTRACT:
An audio speaker has a driver unit having a support frame with a central portion forming a magnetic structure defining an annular gap around a central magnetic post, a vibration system having a diaphragm and a voice coil, the voice coil is attached to one side of the diaphragm where the vibration system is fixed to the support frame and where the voice coil is movably mounted in the annular gap, and a magnetic fluid disposed in the annular gap only in a space between one side of the voice coil and a surface of the annular gap having a higher magnetic flux density.

REFERENCES:
patent: 4017694 (1977-04-01), King
patent: 4320263 (1982-03-01), Thiele
patent: 4414437 (1983-11-01), Trauernicht et al.
patent: 5335287 (1994-08-01), Athanas
patent: 5461677 (1995-10-01), Raj et al.
patent: 6208743 (2001-03-01), Marten et al.
Bottenberg, W. et al., “The Dependence of Loudspeaker Design Parameters on the Properties of Magnetic Fluids,” Presented at the 61st Convention of the Audio Engineering Society, Nov. 3-6, 1978, pp. 1-25.

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