EP1036484B1 - Haut-parleurs du type panneau a mode resonnant - Google Patents

Haut-parleurs du type panneau a mode resonnant Download PDF

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Publication number
EP1036484B1
EP1036484B1 EP98949102A EP98949102A EP1036484B1 EP 1036484 B1 EP1036484 B1 EP 1036484B1 EP 98949102 A EP98949102 A EP 98949102A EP 98949102 A EP98949102 A EP 98949102A EP 1036484 B1 EP1036484 B1 EP 1036484B1
Authority
EP
European Patent Office
Prior art keywords
panel
resonant
suspension means
suspension
form loudspeaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98949102A
Other languages
German (de)
English (en)
Other versions
EP1036484A1 (fr
Inventor
Graham Bank
Martin Colloms
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NVF Tech Ltd
Original Assignee
New Transducers Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Publication of EP1036484A1 publication Critical patent/EP1036484A1/fr
Application granted granted Critical
Publication of EP1036484B1 publication Critical patent/EP1036484B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers

Definitions

  • the invention relates to loudspeakers and more particularly to panel-form loudspeakers of the kind adapted to be excited by launching bending waves into a resonant panel to cause it to resonate to produce an acoustic output.
  • loudspeakers are described in our International patent application WO97/09842, and are known as distributed mode loudspeakers.
  • a moving diaphragm In conventional pistonic loudspeakers, a moving diaphragm, usually a cone, is held in position on a frame or chassis by at least one flexible member which forms a resilient suspension.
  • This suspension performs at least the following functions, namely:-
  • a flexible corrugated moulded member sometimes known as a roll surround, usually made from a rubber-like material, which is connected between the outer periphery of the diaphragm and the surrounding frame and a corrugated flexible member, sometimes known as a spider, which is connected between the region of the diaphragm apex and the frame.
  • a corrugated flexible member sometimes known as a spider
  • a resonant panel loudspeaker we have discovered that a number of regions exist within the panel which have low average velocities by reason of the inherent nature of the panels and have concluded that it might be possible to locate a suspension at or near these panel positions and that the low velocity in such regions will mean that the suspension will have little or no effect on the vibrational characteristics of the panel as a whole.
  • a resonant panel-form loudspeaker comprising suspension means located in at least one panel region of low average velocity, the suspension means being created by incising the panel structure to form at least one cantilever member integral with the panel structure.
  • suspension means may be used to suspend the panel in a support and/or to support a vibration exciter on the panel.
  • the support may comprise a surrounding area of the panel, which surrounding region may be acoustically inactive.
  • the resonant panel-form loudspeaker may comprise a panel having an acoustically active area and panel regions of low average velocity surrounding the acoustically active area, with slots or grooves in the panel structure defining the acoustically active area.
  • the slots or grooves may be such that they extend only partly through the panel structure.
  • the idea of using low energy regions of the panel for the mechanical support of the panel itself or of an exciter on the panel may be extended to include the use of slots or through incisions in the panel for the purpose of areal definition of a desired acoustically active panel area for distributed mode operation or at least desired acoustic vibration behaviour set within, or as a part of a larger panel component.
  • Such slotting will, for example, permit a wide range of distributed mode type vibrating panels to be produced as an integrated design with arbitrarily formed and contoured vehicle trim panels.
  • the slots may be of any suitable form or shape consistent with the desired vibration behaviour in the required frequency range.
  • FEA finite element analysis
  • the low vibration energy in the suspension regions has the benefit of allowing the use of stronger suspension elements than would otherwise be possible, so increasing the durability of the resulting assembly.
  • the incisions may comprise a parallel pair of slots through the panel structure.
  • the cantilever members may be straight or otherwise, e.g. curved. As concerns a suspension for a vibration exciter, straight cantilevers might be preferred in order better to span the distance between areas of low average velocity and a region of high activity where the exciter is coupled to the panel.
  • the suspension may consist of an array of such cantilever members.
  • the panel may be incised to form cantilever members which retain stiffness in the plane of the panel and which are compliant in the plane of a frame or the like supporting the panel.
  • a separate compliant suspension e.g. of a rubber-like material may be fixed, e.g. by means of an adhesive, to the panel in the said region(s) of low average velocity.
  • the rubber-like suspension may be mounted on the cantilevers.
  • the resonant panel-form loudspeaker may comprise a distributed mode acoustic radiator, e.g. of the kind defined in International patent application WO97/09842.
  • a decorative trim panel e.g. for a vehicle or the like and incorporating a loudspeaker as defined above.
  • the invention is a vehicle, e.g. an automobile, comprising a loudspeaker as defined above or a decorative trim panel as defined above.
  • the invention is a method of making a resonant panel acoustic device characterised by identifying the location of at least one panel region of low average velocity, defining an acoustically active area of the panel by locating said panel region(s) surrounding the acoustically active area, positioning suspension means within the said region(s) and disrupting the panel structure in the said regions to form the suspension means.
  • the method may comprise defining the acoustically active area by slotting the panel structure.
  • the slots may be such that they extend only partly through the panel structure.
  • the method may further comprise identifying the desired panel location, e.g. an anti-node, for coupling the vibration exciter to drive the panel, and identifying one or more nodal regions adjacent to the drive location in which to position the exciter suspension.
  • desired panel location e.g. an anti-node
  • the method may comprise incising the panel material to define cantilevers forming the suspension means.
  • the suspension means may be such as to have at least three cantilevers.
  • a resonant panel-form loudspeaker 14 e.g. of the general kind described in International patent application WO97/09842 and comprising a resonant generally rectangular flat panel 1 usually of a stiff lightweight material forming an acoustic radiator and an inertial vibration exciter 4 mounted on the panel 1 to induce bending wave vibration in the panel to cause it to resonate to produce an acoustic output.
  • the panel may be of monolithic construction, but as shown comprises a cellular core 2 sandwiched between opposed face skins 3.
  • the inertial vibration exciter 4 comprises a voice coil/tubular coil former assembly 13 mounted, e.g. by bonding in a circular aperture 12 in the panel 1 whereby the assembly 13 extends from one face of the panel (the upper face as shown in Figure 1) and projects into an annular gap 15 in a magnet assembly 5,6,7 and defined between a disc-like pole piece 7 and a pole cap 6 which together sandwich a disc-like magnet 5.
  • the assembly comprising the magnet 5 and poles 6 and 7 is mounted on the panel 1 for axial movement relative to the coil/former assembly 13, when the coil is energised with a signal, on a compliant suspension attached to an annular flange 8 projecting from the cup 6 and comprising three equi-spaced rubber-like pads 9, only one of which is visible in Figure 1.
  • the pads 9 are mounted on finger-like cantilevers 10 formed by incising U-shaped slots 11 through the panel and equi-spaced round and concentric with the aperture 12 as best can be seen in Figure 2 in panel regions of low average velocity, such that the inner ends 16 of the cantilevers are free for movement normal to the plane of the panel 1.
  • the pads 9 are attached near to the free ends 16 of the cantilevers 10. It will be understood that, if desired, the pads 9 might be omitted and the magnet assembly 5,6,7 might instead be mounted directly on the cantilevers 10.
  • Figure 3 of the drawings show various alternative embodiments of cantilever for suspending a vibration exciter on the panel 1.
  • These include a single straight finger-like cantilever 10 defined by a U-shaped slot or incision 11 of the kind shown in Figures 1 and 2, a curved cantilever 17 defined by a spiral slot 18, and a resilient suspension comprising a cantilever member 19 defined between an opposed pair of arcuate slots 20 and having a central part circular portion 21 and an opposed pair of projections 22 attached at their distal ends to the panel, with the magnet system connected at a central position 23 of the portion 21.
  • Figures 4 to 7 disclose an embodiment of resonant panel-form loudspeaker 14 of the general kind described above and having a resonant panel 1 forming part of a larger panel 24, which may, for example, be a decorative trim panel in an automobile or the like vehicle.
  • the loudspeaker 14 has a rectangular resonant 5 panel 1 defined within the larger panel 24 by grooves or slots 25, the panel 1 being suspended in the panel 24 by suspension cantilevers 27 defined by opposed parallel slots 26 arranged to bridge the slot 25 in regions round the panel 1 of low average velocity.
  • One cantilever is disposed on each side of the panel 1.
  • the vibration exciter 4 may be suspended as described above or conveniently as desired.
  • the slot 25 may extend only partly through the panel 1.
  • the slot 25 extends through the upper skin 3 and through the core 2 of the panel 1 to leave the lower skin intact and covering the slot.
  • the slot 25 may extend completely through the panel 1.
  • the slotting may be made at an early stage of manufacture, e.g. with laser or water jet cutting and the slots need only be wide enough to achieve a stable clearance for the vibrating component.
  • a width of 1mm or 2mm may generally be sufficient.
  • the width of the suspension component depends upon the effective cantilever length, the toughness and linear stiffness of the panel in that region and the acceleration forces which the whole assembly might be reasonably required to sustain. Values of about 4 to about 25mm have proved effective for cantilever width.
  • a relatively narrow slot width allow for a safe grounding of the panel in contrast to surface configurations using adhesive bonding to compliant suspension components. In this later case the suspension may suffer damage due to de-bonding.
  • the larger general panel may act as a baffle, generally augmented by local structures such as vehicle door frame or some overall framing and support.
  • the structural panel will be augmented by the design of the room or building. Acoustic leakage via the narrow slots is likely to be negligible between front and back. Such low leakage is also beneficial in respect of stray noise isolation from the back to the front of the panel which may be important in some applications.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Claims (17)

  1. Un haut-parleur en forme de panneau résonnant (14), caractérisé par un moyen de suspension placé dans au moins une région de panneau ayant une faible vitesse moyenne, le moyen de suspension étant créé en incisant la structure du panneau pour former au moins un élément en porte-à-faux (10, 17, 19, 27) intégré à la structure du panneau.
  2. Un haut-parleur en forme de panneau résonnant selon la revendication 1, caractérisé en ce que les incisions comprennent une paire de fentes (26) traversant la structure du panneau.
  3. Un haut-parleur en forme de panneau résonnant selon la revendication 1 ou la revendication 2, caractérisé en ce que le moyen de suspension comprend un réseau d'éléments en porte-à-faux.
  4. Un haut-parleur en forme de panneau résonnant selon la revendication 1, caractérisé en ce que les éléments en porte-à-faux (10, 17, 19, 27) sont conçus pour conserver une rigidité dans le plan du panneau (1) et pour créer une souplesse dans un plan normal au plan du panneau (1).
  5. Un haut-parleur en forme de panneau résonnant selon l'une quelconque des revendications précédentes, caractérisé par une suspension souple (9) fixée au panneau (1).
  6. Un haut-parleur en forme de panneau résonnant selon la revendication 5, caractérisé en ce que la suspension souple (9) est fixée à l'élément en porte-à-faux.
  7. Un haut-parleur en forme de panneau résonnant selon l'une quelconque des revendications précédentes, caractérisé par un radiateur acoustique à mode réparti.
  8. Un haut-parleur en forme de panneau résonnant (14) selon l'une quelconque des revendications précédentes, caractérisé en ce que le panneau (24) comprend une zone active au point de vue acoustique (1) et des régions de faible vitesse moyenne entourant la zone active au point de vue acoustique, et caractérisé par des fentes (25) ou des rainures formées dans la structure du panneau et définissant la zone active au point de vue acoustique.
  9. Un haut-parleur en forme de panneau résonnant selon la revendication 8, caractérisé en ce que les fentes (25) ou les rainures sont telles qu'elles s'étendent seulement partiellement à travers la structure du panneau.
  10. Un panneau de garniture décoratif caractérisé par un haut-parleur en forme de panneau résonnant selon la revendication 8 ou la revendication 9.
  11. Un véhicule caractérisé par un panneau de garniture décoratif selon la revendication 10.
  12. Un procédé de fabrication d'un dispositif acoustique à panneau résonnant, caractérisé en ce qu'on identifie l'emplacement d'au moins une région de panneau ayant une faible vitesse moyenne, on définit une zone du panneau active au point de vue acoustique en plaçant ladite ou lesdites régions du panneau de façon qu'elles entourent la zone active au point de vue acoustique, on positionne un moyen de suspension à l'intérieur de ladite ou desdites régions, et on introduit une discontinuité dans la structure du panneau dans ladite ou lesdites régions pour former le moyen de suspension.
  13. Un procédé selon la revendication 12, caractérisé en ce qu'on définit la zone active au point de vue acoustique en formant des fentes dans la structure du panneau.
  14. Un procédé selon la revendication 13, caractérisé en ce qu'on forme les fentes (25) de façon qu'elles s'étendent seulement partiellement à travers la structure du panneau.
  15. Un procédé selon l'une quelconque des revendications 12 à 14, caractérisé en ce qu'on incise le matériau du panneau pour définir des éléments en porte-à-faux (10, 17, 19, 27) formant le moyen de suspension.
  16. Un procédé selon l'une quelconque des revendications 12 à 15, caractérisé en ce qu'on forme un moyen de suspension d'excitateur de vibration (10, 17, 19) en identifiant un emplacement d'excitation de panneau désiré pour coupler l'excitateur de vibration (4) au panneau (1) pour exciter le panneau, et on identifie une ou plusieurs régions ayant une faible vitesse moyenne, adjacentes à l'emplacement d'excitation, pour positionner le moyen de suspension d'excitateur (10, 17, 19).
  17. Un procédé selon l'une quelconque des revendications 12 à 16, caractérisé en ce qu'on forme un moyen de suspension ayant au moins trois éléments en porte-à-faux.
EP98949102A 1997-10-21 1998-10-16 Haut-parleurs du type panneau a mode resonnant Expired - Lifetime EP1036484B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9722079.2A GB9722079D0 (en) 1997-10-21 1997-10-21 Loudspeaker suspension
GB9722079 1997-10-21
PCT/GB1998/003131 WO1999021397A1 (fr) 1997-10-21 1998-10-16 Haut-parleurs du type panneau a mode resonnant

Publications (2)

Publication Number Publication Date
EP1036484A1 EP1036484A1 (fr) 2000-09-20
EP1036484B1 true EP1036484B1 (fr) 2004-05-06

Family

ID=10820766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98949102A Expired - Lifetime EP1036484B1 (fr) 1997-10-21 1998-10-16 Haut-parleurs du type panneau a mode resonnant

Country Status (14)

Country Link
EP (1) EP1036484B1 (fr)
JP (1) JP2001521353A (fr)
KR (1) KR20010031264A (fr)
CN (1) CN1271508A (fr)
AT (1) ATE266301T1 (fr)
AU (1) AU9548498A (fr)
BR (1) BR9812949A (fr)
CA (1) CA2303789A1 (fr)
DE (1) DE69823695D1 (fr)
GB (1) GB9722079D0 (fr)
HK (1) HK1027251A1 (fr)
IL (1) IL135677A0 (fr)
TW (1) TW410526B (fr)
WO (1) WO1999021397A1 (fr)

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GB0025125D0 (en) * 2000-10-13 2000-11-29 New Transducers Ltd Loudspeaker driver
US7548854B2 (en) 2002-01-31 2009-06-16 Awi Licensing Company Architectural sound enhancement with pre-filtered masking sound
US6983819B2 (en) 2002-04-02 2006-01-10 Awi Licensing Company Entertainment sound panels
US8284955B2 (en) 2006-02-07 2012-10-09 Bongiovi Acoustics Llc System and method for digital signal processing
US10158337B2 (en) 2004-08-10 2018-12-18 Bongiovi Acoustics Llc System and method for digital signal processing
US10848118B2 (en) 2004-08-10 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
US11431312B2 (en) 2004-08-10 2022-08-30 Bongiovi Acoustics Llc System and method for digital signal processing
JP4565991B2 (ja) * 2004-12-24 2010-10-20 富士通テン株式会社 車両の内装板を振動板としたスピーカ装置及び内装板
US10701505B2 (en) 2006-02-07 2020-06-30 Bongiovi Acoustics Llc. System, method, and apparatus for generating and digitally processing a head related audio transfer function
US10069471B2 (en) 2006-02-07 2018-09-04 Bongiovi Acoustics Llc System and method for digital signal processing
US11202161B2 (en) 2006-02-07 2021-12-14 Bongiovi Acoustics Llc System, method, and apparatus for generating and digitally processing a head related audio transfer function
US9615189B2 (en) 2014-08-08 2017-04-04 Bongiovi Acoustics Llc Artificial ear apparatus and associated methods for generating a head related audio transfer function
US10848867B2 (en) 2006-02-07 2020-11-24 Bongiovi Acoustics Llc System and method for digital signal processing
JP4946272B2 (ja) * 2006-08-30 2012-06-06 日本電気株式会社 電気音響変換器および該電気音響変換器を搭載するソーナー用送信器
JP4967725B2 (ja) * 2007-03-12 2012-07-04 ヤマハ株式会社 アレイスピーカ及びスピーカ装置
EP2436194B1 (fr) * 2009-05-29 2013-07-03 e-Scape AS Agencement de haut-parleur
US9264004B2 (en) 2013-06-12 2016-02-16 Bongiovi Acoustics Llc System and method for narrow bandwidth digital signal processing
US9883318B2 (en) 2013-06-12 2018-01-30 Bongiovi Acoustics Llc System and method for stereo field enhancement in two-channel audio systems
US9906858B2 (en) 2013-10-22 2018-02-27 Bongiovi Acoustics Llc System and method for digital signal processing
US10639000B2 (en) 2014-04-16 2020-05-05 Bongiovi Acoustics Llc Device for wide-band auscultation
US10820883B2 (en) 2014-04-16 2020-11-03 Bongiovi Acoustics Llc Noise reduction assembly for auscultation of a body
US9615813B2 (en) 2014-04-16 2017-04-11 Bongiovi Acoustics Llc. Device for wide-band auscultation
US9564146B2 (en) 2014-08-01 2017-02-07 Bongiovi Acoustics Llc System and method for digital signal processing in deep diving environment
US9638672B2 (en) 2015-03-06 2017-05-02 Bongiovi Acoustics Llc System and method for acquiring acoustic information from a resonating body
DE102015105330A1 (de) * 2015-04-08 2016-10-13 Ujet Vehicles S.À.R.L. Batteriebaugruppe und Motorroller mit einer Batteriebaugruppe
US9906867B2 (en) 2015-11-16 2018-02-27 Bongiovi Acoustics Llc Surface acoustic transducer
US9621994B1 (en) 2015-11-16 2017-04-11 Bongiovi Acoustics Llc Surface acoustic transducer
CN112236812A (zh) 2018-04-11 2021-01-15 邦吉欧维声学有限公司 音频增强听力保护系统
WO2020028833A1 (fr) 2018-08-02 2020-02-06 Bongiovi Acoustics Llc Système, procédé et appareil pour générer et traiter numériquement une fonction de transfert audio liée à la tête
KR102215716B1 (ko) * 2019-10-21 2021-02-18 삼원액트 주식회사 음향재생기능을 갖는 패널

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AU702920B2 (en) * 1995-09-02 1999-03-11 New Transducers Limited Loudspeakers comprising panel-form acoustic radiating elements
UA51671C2 (uk) * 1995-09-02 2002-12-16 Нью Транзд'Юсез Лімітед Акустичний пристрій

Also Published As

Publication number Publication date
EP1036484A1 (fr) 2000-09-20
TW410526B (en) 2000-11-01
CN1271508A (zh) 2000-10-25
AU9548498A (en) 1999-05-10
DE69823695D1 (de) 2004-06-09
JP2001521353A (ja) 2001-11-06
ATE266301T1 (de) 2004-05-15
HK1027251A1 (en) 2001-01-05
BR9812949A (pt) 2000-08-08
CA2303789A1 (fr) 1999-04-29
IL135677A0 (en) 2001-05-20
KR20010031264A (ko) 2001-04-16
GB9722079D0 (en) 1997-12-17
WO1999021397A1 (fr) 1999-04-29

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