Global Patent Index - EP 1022929 A2

EP 1022929 A2 2000-07-26 - Loudspeaker with a jacketed magnetic core

Title (en)

Loudspeaker with a jacketed magnetic core

Title (de)

Lautsprecher mit einem ummantelten Magnetkern

Title (fr)

Haut-parleur avec un noyau magnétique d'habillage

Publication

EP 1022929 A2 (DE)

Application

EP 00100968 A

Priority

DE 19902679 A

Abstract (en)

The loudspeaker has a voice coil (2) and a permanent magnet (1). The permanent magnet consists of a core (10) made of a highly magnetic alloy including an element from the group of rare earths, and coated in a plastics layer (11). The plastics layer contains particles of an alloy including an element from the group of rare earths. The alloy may be a neodymium alloy. The alloys in the core may be the same as the alloy in the plastics layer. The plastics layer is several tenths of a millimetre thick. An Independent claim is included for a method of manufacturing a permanent magnet for a loudspeaker.

Abstract (de)

Die Erfindung betrifft einen Lautsprecher nach dem dynamischen Wandlerprinzip. Dieser Lautsprecher zeigt einen Dauermagneten 1, der einen Kern 10 aus einer hochmagnetischen Legierung mit einem Element der Gruppe der Seltenen Erden, insbesondere aus einer Neodymlegierung, aufweist. Diese Legierungen sind stark oxidationsgefährdend und reagieren sehr heftig auf Luftfeuchtigkeit. Dieser Kern 10 wird von einer Kunststoffschicht 11 ummantelt, die Partikel aus einer entsprechenden Legierung mit einem Element aus der Gruppe der Seltenen Erden aufweist. Durch diesen Aufbau des Dauermagneten 1 ist ein sehr starkes Magnetfeld gegeben, das einen hohen Wirkungsgrad des Lautsprechers bewirkt. Zudem erweist sich dieser Dauermagnet 1 für den erfindungsgemäßen Lautsprecher als wenig anfällig gegen äußere schädliche Einflüsse. <IMAGE>

IPC 1-7 (main, further and additional classification)

H04R 9/02

IPC 8 full level (invention and additional information)

H01F 1/057 (2006.01); H01F 41/02 (2006.01); H04R 9/02 (2006.01); H04R 9/06 (2006.01)

CPC (invention and additional information)

H04R 9/025 (2013.01); H01F 1/0577 (2013.01); H01F 41/026 (2013.01); H04R 9/02 (2013.01); H04R 9/06 (2013.01)

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

EP 1022929 A2 20000726; EP 1022929 A3 20070613; EP 1022929 B1 20080312; DE 19902679 C1 20001116; DE 50015036 D1 20080424

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