Magnetic membrane suspension

Details Magnetic membrane suspension Magnetic membrane suspension

2011-05-10

2011-05-10

Kuntz, Curtis (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S338000, C381S408000

Reexamination Certificate

active

07940953

ABSTRACT:
An electro-acoustic transducer has a membrane comprises a folded or curved sheet of film material. A frame supports the membrane in at least an upper end thereof. A resilient suspension connects the upper ends of the membrane to the frame. A driver system is attached to the frame and the membrane for moving the membrane dependent on an electrical input signal. At least one ferromagnetic element is arranged in the membrane or on one of the surfaces of the membrane at its lower end. At least one magnet provides a magnetic field, the magnet being attached to the frame in a position adjacent the lower end of the membrane. The ferromagnetic element is pulled down by a magnetic force between the element and the magnet establishing a gap therebetween such that tensioning of the membrane is achieved by the magnetic force.

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