EP 1474952 B1 20080820 - MOVING-COIL ELECTRODYNAMIC MOTOR PARTICULARLY FOR A LOUDSPEAKER, LOUDSPEAKER AND CORRESPONDING POLE PIECE
Title (en)
MOVING-COIL ELECTRODYNAMIC MOTOR PARTICULARLY FOR A LOUDSPEAKER, LOUDSPEAKER AND CORRESPONDING POLE PIECE
Title (de)
ELEKTRODYNAMISCHER SCHWINGSPULENANTRIEB, INSBESONDERE FÜR EINEN LAUTSPRECHER, LAUTSPRECHER UND ANGEPASSTES POLSTÜCK
Title (fr)
MOTEUR ELECTRODYNAMIQUE A BOBINE MOBILE NOTAMMENT POUR HAUT-PARLEUR, HAUT-PARLEUR ET PIECE POLAIRE ADAPTEE
Publication
Application
Priority
- FR 0300470 W 20030213
- FR 0201782 A 20020213
Abstract (en)
[origin: WO03069953A1] The invention relates to a moving-coil electrodynamic motor, particularly for a loudspeaker, the moving-coil formed by a winding (5, 15, 25, 35, 55) with a given number of turns fixed to an acoustic membrane (6, 16). The motor comprises at least one magnet (3, 13, 23, 33, 53) arranged between an anterior pole piece (2, 12, 22, 32, 52) and a posterior pole piece (4, 4', 14, 14', 24, 34, 34', 54), the anterior pole piece and the posterior pole piece enclosing the magnetic field within a gap defined on a first side by a first edge and on a second side by a second edge, the moving coil being arranged in said gap. According to the invention, the gap is split, at least one of the edges of said gap comprising a groove (30), said groove being arranged essentially parallel to the turns, whereby the edge has a first posterior surface of height (E1), separated from a second anterior surface of height (E2) by the groove of height (C), the groove forming a recessed zone relative to the first surface and the second surface, the coil having a height (HB) which is less than or equal to the height (E1+C+E2) of the split gap and the groove (30) having an continuous closed internal ring made from electrically conducting material. The invention further relates to a loudspeaker and a pole piece.
IPC 8 full level
H04R 9/02 (2006.01)
CPC (source: EP US)
H04R 9/025 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
WO 03069953 A1 20030821; AT E406072 T1 20080915; AU 2003222377 A1 20030904; DE 60323054 D1 20081002; EP 1474952 A1 20041110; EP 1474952 B1 20080820; FR 2836000 A1 20030815; FR 2836000 B1 20040528; US 2005226457 A1 20051013; US 7283642 B2 20071016
DOCDB simple family (application)
FR 0300470 W 20030213; AT 03717399 T 20030213; AU 2003222377 A 20030213; DE 60323054 T 20030213; EP 03717399 A 20030213; FR 0201782 A 20020213; US 50481105 A 20050405