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1. CA2295007 - HAUT-PARLEURS EN FORME DE PANNEAUX

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
CLAIMS
1. Loudspeaker comprising a panel member as a resonant acoustic radiator relying on bending wave action, a driver having a voice coil coupled to the panel member to cause bending waves in the panel member, and a hole a provided in the panel, locally of the driver, characterised in that the hole alters the mass and/or bending capability of the panel member locally of the driver to reduce resonances of the zone of the panel in the voice coil area. 2 . Loudspeaker according to claim 1, wherein the hole is of constant cross-section into and/or throughout thickness of the panel member. 3. Loudspeaker according to claim 2, wherein the cross-section is less than the area of the voice coil by an extent related to resultant effective raising of unwanted high frequency components, 4, Loudspeaker according to claim 1, wherein the voice coil is mounted on the panel around the circumference of the hole. 5. Loudspeaker according to claim 1. or claim 2, wherein the hole is of cross-section mis-matching with area of said coupling to facilitate spaced connections involved in said coupling. 6. Loudspeaker according to claim 5, wherein the driver is of magnet-and-moving coil type and the voice coil of
the driver has said spaced connections about the hole. 7. Loudspeaker according to claim 1, wherein the driver is of magnet-and-moving coil type and the voice coil includes a former expending into the hole in the panel member. 5. Loudspeaker according to claim 7, wherein the voice coil former extends throughout thickness of the panel member. 9.~Loudspeaker according to any of claims 1 to 9, wherein the driver has a pole piece extending into the hole. 10. Loudspeaker comprising a panel member as a resonant acoustic radiator relying on bending wave action, a driver having a voice coil coupled to the panel member to cause bending waves in the panel member, and an additional mass or damping provided on the panel, characterised in that the additional mass or damping is provided locally of the driver, on either or both sides of the panel member, for altering the mass and/or bending capability of the panel member locally of the driver to reduce resonances of the zone of the panel in the voice coil area. 11. Loudspeaker according to claim 10, wherein the locally altered or different mass and/or bending capability is substantially within the area of the coupling of the driver to the pane1 member. 12. Loudspeaker according to claim 11, wherein the locally altered/different mass and/or bending capability is substantially concentric with the driver.
13. Loudspeaker according to any of claims 10 to 12 claim, wherein the driver is of magnet-and-moving coil type. 14. Loudspeaker according to any of claims 10 to 13, wherein the additional mass or damping is an additional mass. 15.~Loudspeaker according to claim 10 or 14, wherein the additional mass or damping is an additional damping. 16. Loudspeaker according to claim 15 wherein the damping means comprises elastomeric material sandwiched between a pole-piece of the driver and surface of the panel member. 17. Loudspeaker according to claim 16, wherein the damping means serves in compliant suspension of the driver relative to the panel member. 18. Loudspeaker according to any of claims 10 to 17, wherein the panel member has additonal mass at at least one other position spaced away from the driver.