Loudspeaker with short circuit rings at the voice coil

Details Loudspeaker with short circuit rings at the voice coil Loudspeaker with short circuit rings at the voice coil

1997-04-17

1998-09-29

Le, Huyen

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381194, H04R 2500

Patent

active

058155872

ABSTRACT:
The invention is a loudspeaker. The loudspeaker includes a driver diaphragm having a voice coil and an associated magnet system including an annular air gap within which the voice coil locates, the voice coil being longer than the axial extension of the annular air gap, the magnet system including a central pole piece, the voice coil and central pole piece having a frontal end towards said driver diaphragm and a rearward end away from said driver diaphragm, the magnet system further comprising a cylinder arrangement, of a material and of a wall thickness sufficient to provide a conductivity suitable to act as a short circuit ring carrying compensating induction currents, the cylinder arrangement comprising a root part at a root area of the pole piece and an inner pole ring part rearward of the annular gap, the root part being located outside the rearward end of the voice coil when the voice card assumes a position of rest, and further comprising an outer pole ring part located forward of the annular gap, the inner pole ring part and the outer pole ring part both being shorter than half a length of the voice coil.

REFERENCES:
patent: 5151943 (1992-09-01), Van Gelder

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