EP 0113732 A4 19860213 - ELECTROMAGNETIC-ACOUSTIC TRANSDUCER.
Title (en)
ELECTROMAGNETIC-ACOUSTIC TRANSDUCER.
Title (de)
ELEKTROMAGNETISCH-AKUSTISCHER UMWANDLER.
Title (fr)
TRANSDUCTEUR ELECTROMAGNETIQUE-ACOUSTIQUE.
Publication
Application
Priority
- AU PF492482 A 19820719
- AU PF584582 A 19820913
- AU PF687782 A 19821119
Abstract (en)
[origin: WO8400460A1] An electromagnetic transducer having a diapragm (11) on at least one face of which there is an audio-frequeny current conductor (15). The conductor (15) is arranged in a wave form pattern to divide the diaphragm (11) into a plurality of acoustically rigid zones (17) and define current paths (16) along the sides of the zones (17). An array of magnets (21) is arranged to produce a magnetic field orthogonal to each current path (16) whereby interaction between the magnetic fields and an audio-frequency current passing along the current paths (16) effects vibration of the diaphragm (11).
IPC 1-7
IPC 8 full level
CPC (source: EP)
H04R 9/047 (2013.01)
Citation (search report)
- [X] US 4337379 A 19820629 - NAKAYA TAKAO
- [X] NL 6613713 A 19680401
- [X] US 3873784 A 19750325 - DOSCHEK ANTONY Z
- [A] DE 2442854 A1 19750320 - AKG AKUSTISCHE KINO GERAETE
- [A] FR 2450020 A1 19800919 - SORIA JEAN YVES
- [A] FR 1329295 A 19630607 - PHILIPS NV
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
WO 8400460 A1 19840202; EP 0113732 A1 19840725; EP 0113732 A4 19860213; JP S59501289 A 19840719
DOCDB simple family (application)
AU 8300084 W 19830627; EP 83901888 A 19830627; JP 50212983 A 19830627