EP 1273204 B1 20040811 - ACOUSTIC TRANSDUCER FOR BROAD-BAND LOUDSPEAKERS OR HEADPHONES
Title (en)
ACOUSTIC TRANSDUCER FOR BROAD-BAND LOUDSPEAKERS OR HEADPHONES
Title (de)
AKUSTISCHER WANDLER FÜR BREITBAND-LAUTSPRECHER ODER KOPFHÖRER
Title (fr)
TRANSDUCTEUR ACOUSTIQUE POUR HAUT-PARLEUR LARGE BANDE OU ECOUTEUR
Publication
Application
Priority
- DE 10018032 A 20000404
- DE 10018033 A 20000404
- EP 0103720 W 20010402
Abstract (en)
[origin: US2003161494A1] The invention relates to an acoustic transducer for broad-band loudspeakers or magnet-free, electrodynamic head-phones for generating sound, especially for the use in the homogenous and/or inhomogeneous magnetic field of a magnetic resonance tomograph. According to the advantages of the invention, sound having defined characteristics can be generated in such a way that said sound is provided with good quality and high effectiveness within the strong magnetic field of a magnetic resonance tomograph. In addition to music and voice, this comprises the generation of sound for actively controlling noise by generating sound by means of one or several membranes (1) that form air pockets. Said membranes (1) consist of elastic, non-magnetic or slightly magnetic material and are connected to strip conductors (2) in a two-dimensional and solid manner. A Lorentz force which is caused by the magnetic field of the magnetic resonance tomograph is exerted on said strip conductors as the driving power when current flows.
IPC 1-7
IPC 8 full level
G01R 33/28 (2006.01); A61B 5/055 (2006.01); G10K 13/00 (2006.01); H04R 1/02 (2006.01); H04R 1/10 (2006.01); H04R 7/02 (2006.01); H04R 7/06 (2006.01); H04R 7/14 (2006.01); H04R 9/00 (2006.01); H04R 9/02 (2006.01); H04R 9/04 (2006.01); H04R 23/00 (2006.01)
CPC (source: EP US)
G10K 13/00 (2013.01 - EP US); H04R 7/02 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0176320 A2 20011011; WO 0176320 A3 20020418; AT E273604 T1 20040815; AU 5624701 A 20011015; CA 2405436 A1 20021004; DE 50103233 D1 20040916; EP 1273204 A2 20030108; EP 1273204 B1 20040811; JP 2004516690 A 20040603; US 2003161494 A1 20030828
DOCDB simple family (application)
EP 0103720 W 20010402; AT 01929489 T 20010402; AU 5624701 A 20010402; CA 2405436 A 20010402; DE 50103233 T 20010402; EP 01929489 A 20010402; JP 2001573858 A 20010402; US 24066503 A 20030325