Loudspeaker with internal negative stiffness mechanism

Details Loudspeaker with internal negative stiffness mechanism Loudspeaker with internal negative stiffness mechanism

2004-06-07

2008-11-18

Ensey, Brian (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

With mechanical amplifier arrangement

C381S349000, C381S352000

Reexamination Certificate

active

07454025

ABSTRACT:
In a loudspeaker device of the present invention, an interior space of a cabinet is parted into first and second chambers, a diaphragm on which ring-shaped magnetic boards are fixed is attached to a parting board via an edge portion, and ring-shaped fixed magnets are provided so as to face the magnetic boards, respectively. Vibration of the diaphragm vibrated by sound pressure from a speaker unit is intensified by forces of attraction of the magnets in order to reduce an acoustic stiffness of the cabinet and equivalently increase a cabinet volume, thereby realizing satisfactory bass reproduction with a small cabinet.

REFERENCES:
patent: 2810021 (1957-10-01), Brownscombe
patent: 6431309 (2002-08-01), Coffin
patent: 2 297 880 (1996-08-01), None
patent: 63-077297 (1988-04-01), None
patent: 2000-308174 (2000-11-01), None
patent: 2001-157290 (2001-06-01), None
Partial European Search Report dated Apr. 1, 2008 in the corresponding European patent application.

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