Abstract:
An acoustic passive radiator that controls "rocking mode" vibration. An acoustic passive radiator includes a diaphragm for radiating acoustic energy. The diaphragm has a perimeter portion and a central portion. The perimeter portion is thicker than the central portion. The passive radiator further includes a passive radiator suspension. The suspension includes a skin element encasing the diaphragm. The skin element comprises a surround for physically coupling the passive radiator to an acoustic enclosure, pneumatically sealing the diaphragm and the enclosure. The surround has a non-uniform width. The passive radiator a non-pneumatically sealing, non-surround, non-spider suspension element. The non-surround suspension element and the surround coact to control the motion of the diaphragm and to support the weight of the diaphragm.
Abstract:
L'invention concerne un dispositif de suspension pour haut-parleur comportant un bord extérieur (12) annulaire apte à fixer le dispositif de suspension avec un châssis (13), un bord intérieur (14) annulaire apte à fixer le dispositif de suspension avec une membrane (15), un arc de suspension (16) s'étendant annulairement entre les bords, ledit arc de suspension (16) étant apte à absorber des contraintes de déplacement produites sur le bord intérieur (14) au moyen d'une déformation formant ainsi au moins un mode de résonnance, l'arc de suspension (16) comportant au moins une excroissance (20) annulaire positionnée de sorte à minimiser l'au moins un mode de résonnance de l'arc de suspension (16),la masse de l'au moins une excroissance (20) annulaire étant comprise entre 150% et 400% de la masse d'une partie de l'arc de suspension (16) sur laquelle l'au moins une excroissance (20) annulaire est positionnée.
Abstract:
Various embodiments of a silicon microphone (10) sensing element without dedicated backplate are disclosed. The microphone sensing element has a circular or polygonal diaphragm (13a) with a plurality of perforated springs (13b) suspended above the front side of a conductive substrate (11 ). The diaphragm (13a) is aligned above one or more back holes in the substrate having a front opening smaller than the diaphragm. In one embodiment, a continuous perforated spring surrounds the diaphragm and has a shape that conforms to the diaphragm. A plurality of perforated beams connects the spring to rigid pads that anchor the movable diaphragm and spring. In another embodiment, there is a plurality of perforated springs having double or triple folding configurations and a plurality of perforated beams connecting the diaphragm to rigid pads. Also disclosed is a scheme to integrate the silicon microphone sensing element with CMOS devices on a single chip.
Abstract:
An acoustic device (500), comprising an oscillatory membrane (501) which comprises a transducing element (503) and a frame (504) adapted for accommodating the membrane (501) in an accommodation plane, wherein the membrane (501) is accommodated in the frame (504) in such a manner that a translational motion of the membrane (501) in at least one direction of the accommodation plane is made possible.
Abstract:
The invention relates to so-called panel loudspeakers (11) working according to the multiresonance principle. Said loudspeakers are generally formed by a core layer (13) and at least one outer layer (14.o, 14.u). The outer layers (14.o, 14.u) are connected to the core layer (13). A periphery is also provided (12) enclosing the panel loudspeaker (11) at a lateral distance (A). The panel loudspeaker is connected to the periphery (12) by means of connecting elements (17, 17'). Although good reproduction results can be obtained in the mid and high audio frequencies with the panel loudspeakers (11) described above, undesired large panel surfaces are known to be required for good low frequency reproduction. When such panel surfaces are not used, the lowest panel resonances ensuring bass reproduction are shifted towards the midfrequencies. Hence, the invention aims at providing a panel loudspeaker (11) exhibiting improved acoustic reproduction in the low frequency range despite a relatively smaller panel surface. According to the invention, this is achieved in that the connecting elements (17 17') are subjected to mechanical tension when they are connected to the periphery (12) resulting in supplementary particularly low frequency drum resonances in addition to the existing low frequency panel resonances, which can be modulated by the tension in the connecting elements (17, 17').
Abstract:
Dispositif acoustique numérique comportant au moins une membrane suspendue (2) en regard d'un support (4) et au moins un actionneur (6, 10) associé à ladite membrane, ledit actionneur (6, 10) associé étant destiné à déplacer ladite membrane (2) en éloignement et/ou en rapprochement dudit support (4), ledit dispositif comportant également des moyens d'arrêt (14) destinés à interrompre le déplacement de ladite membrane (2) suite à l'activation dudit actionneur lorsque la membrane a une vitesse non nulle, les moyens d'arrêt (14) étant dimensionnés de sorte à interrompre le déplacement de la membrane (2) lorsque le déplacement de la membrane est supérieur ou égale à 50% de la course maximale théorique de la membrane et inférieur ou égale à 95% de la course maximale théorique de la membrane.