Moving-coil electrodynamic motor for a loudspeaker,...

Details Moving-coil electrodynamic motor for a loudspeaker,... Moving-coil electrodynamic motor for a loudspeaker,...

2007-10-16

2007-10-16

Le, Huyen (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S412000, C381S420000

Reexamination Certificate

active

10504811

ABSTRACT:
The invention relates to a moving-coil electrodynamic motor and a loudspeaker. A moving-coil includes a winding with a given number of turns. A motor comprises a magnet arranged between a front pole piece and a rear pole piece. The front pole piece and the rear pole piece enclose a magnetic field in a gap and the moving coil is arranged in the gap. The gap may include a groove arranged essentially parallel to the turns. The coil has a height less than or equal to the height of the gap and the groove forms a recessed zone with an internal ring made from electrically conducting material.

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patent: 6829366 (2004-12-01), Tanabe
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International Search Report for Application No. PCT/FR03/00470 (filed Feb. 13, 2003), mailed Jul. 16, 2003 (4 pages).
Preliminary Search Report for French Application No. FR 02/01782 (filed Feb. 13, 2002), dated Dec. 24, 2002 (4 pages).

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