EP 1234478 A2 20020828 - BENDING WAVE LOUDSPEAKERS
Title (en)
BENDING WAVE LOUDSPEAKERS
Title (de)
BIEGEWEELEN-LAUTSPRECHER
Title (fr)
HAUT-PARLEURS
Publication
Application
Priority
- GB 0004510 W 20001128
- GB 9928456 A 19991202
Abstract (en)
[origin: WO0141498A2] A bending wave panel-form loudspeaker comprises a spaced pair of panels defining between them a shallow fluid cavity, a body member surrounding the pair of panels and suspending the panels by their edges, means sealing the cavity and vibration transducers in the fluid cavity and arranged to drive the respective panels, the electrical connections to the transducers being at least partially in antiphase such that the predominant motion of the panels is in phase to provide a degree of dipole radiation property for the loudspeaker, and the cavity being such that the gap between the panels is in the range 2 to 25 mm such that the shallow cavity provides conditions in which fluid coupling dynamics and behaviour is asserted between the pair of panels due to the fluid layer between them.
IPC 1-7
IPC 8 full level
CPC (source: EP)
H04R 1/227 (2013.01); H04R 7/045 (2013.01)
Citation (search report)
See references of WO 0141498A2
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 0141498 A2 20010607; WO 0141498 A3 20020510; AU 2186401 A 20010612; CN 1390429 A 20030108; EP 1234478 A2 20020828; GB 9928456 D0 20000126
DOCDB simple family (application)
GB 0004510 W 20001128; AU 2186401 A 20001128; CN 00815692 A 20001128; EP 00985445 A 20001128; GB 9928456 A 19991202