EP0924959B1 - Schallwiedergabeanordnung - Google Patents

Schallwiedergabeanordnung Download PDF

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Publication number
EP0924959B1
EP0924959B1 EP98123819A EP98123819A EP0924959B1 EP 0924959 B1 EP0924959 B1 EP 0924959B1 EP 98123819 A EP98123819 A EP 98123819A EP 98123819 A EP98123819 A EP 98123819A EP 0924959 B1 EP0924959 B1 EP 0924959B1
Authority
EP
European Patent Office
Prior art keywords
core layer
recess
sound reproduction
panel
reproduction system
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
EP98123819A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0924959A3 (de
EP0924959A2 (de
Inventor
Wolfgang Bachmann
Gerhard Krump
Hans-Jürgen Regl
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.)
Harman Becker Automotive Systems GmbH
Original Assignee
Harman Becker Automotive Systems GmbH
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 Harman Becker Automotive Systems GmbH filed Critical Harman Becker Automotive Systems GmbH
Publication of EP0924959A2 publication Critical patent/EP0924959A2/de
Publication of EP0924959A3 publication Critical patent/EP0924959A3/de
Application granted granted Critical
Publication of EP0924959B1 publication Critical patent/EP0924959B1/de
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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/01—Acoustic transducers using travelling bending waves to generate or detect sound
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers

Definitions

  • the invention relates to the arrangement of drive systems in sound reproduction arrangements which operate on the bending wave principle.
  • the panel is constructed according to the sandwich principle in that two opposing surfaces of a very light core layer are each connected to a thin cover layer, for example by gluing.
  • the material for the cover layer must have a particularly high expansion shaft speed.
  • Suitable cover layer materials are, for example, thin metal foils or else fiber-reinforced plastic foils.
  • the core layer special requirements are made. Thus, it is necessary that the usable materials initially have a low mass density and low attenuation. In addition, the materials for the core layer must have the highest possible shear modulus perpendicular to the surfaces that are provided with the cover layers. Finally, it is necessary in the sense of a main requirement that the materials which can be used for core layers have a very low modulus of elasticity in the direction in which later the respective core layer formed from this material has its greatest extent.
  • rigid foams can also be used as core layer materials because, despite their isotropic material properties, they still have suitable shear and elasticity modules. Not to mention in this context is that when using rigid foams as a material for the core layer, the outer layers have the task of producing the required anisotropic behavior of the panel.
  • the prior art In order to radiate sound waves by means of a panel as described above, it is necessary to connect the panel to a drive system which then waves the panel perpendicular to the plane of the deck views.
  • the prior art generally uses magnet systems which are also used to drive conventional loudspeakers.
  • the drive systems In order for these drive systems also bring about the necessary deformation of the panel for the radiation of bending waves, the drive systems are usually provided with a corresponding counter bearing.
  • This counter bearing can be formed for example by a support structure which is arranged at a distance to one of the two cover sheets and receives the drive system. Apart from the fact that such a support structure not only increases the depth and weight of such arrangements, such support structures also require a considerable manufacturing effort.
  • the basic idea of the invention is to provide the panel with a recess and to arrange the drive system in this recess. If the sound reproduction device is formed in this way, the core layer itself can be used as an abutment for parts of the drive system. This has in addition to the advantage of weight and Bautiefeneinsparung also the advantage that both surfaces provided with the outer layers can be made uniform by the fully integration of drive systems within the panel. In addition, panels in which the drive systems are fully integrated in the panel or separated from the cover layer (s) from the environment can also be used without difficulty in rooms exposed to dirt or moisture.
  • the weakening of the panel brought about by the recess also results in a particularly good impression of bending waves in the panel, so that the power required to produce the bending shaft is reduced or, with the same power, a vibrational behavior of the panel required for the bass reproduction can be brought about.
  • a particularly good transmission power in low and midrange is achieved when the drive system is formed according to claim 2 of at least one permanent magnet, a voice coil bobbin and a voice coil.
  • the core layer has a honeycomb structure, wherein each honeycomb of a plurality of laterally connected and extending between the two cover layers walls is formed.
  • the walls exposed by the creation of the recess in the core layer to be one or a plurality of honeycombs
  • voice coil bobbins To use voice coil bobbins.
  • the utilization of the core layer as a voice coil former is not limited to the honeycomb structure. Rather, the walls of the core layer forming circular or polygon structures and the walls, which are formed by the formation of a recess in a core layer of hard foam, in the same way usable.
  • the structure further simplifies that according to claim 4, the permanent magnet or magnets are connected directly or by means of holders with the core layer and the areas of the core layer, which are in direct physical communication with the permanent magnet or the holders, have a diameter D1 , which is larger than the diameter D2 of the voice coil.
  • the invention is not limited to the use of electromagnetic drive systems. Rather, piezoelectric drive systems can also be used if higher-frequency sound signals are to be transmitted. In order to realize a piezoelectric drive system, it is sufficient if the bottom of the recess is provided only with a piezoelectric disk.
  • the drive system is realized by means of a disk of piezoelectric material
  • the side of the disk of piezoelectric material, which faces away from the ground, should be provided with a seismic mass in order to absorb counterforce.
  • the bottom of the recess should be equipped with a pressure plate.
  • At least the honeycomb which axially and radially directly adjacent to the recess, should be foamed with a plastic material.
  • FIG. 1 a section of a panel 10 is shown in side elevation.
  • This panel 10 is formed by a core layer 11, an upper cover layer 12.1 and a lower cover layer 12.2.
  • the two cover layers 12 are connected to opposite sides of the core layer 11.
  • the core layer 11 has a honeycomb structure, wherein each of these honeycomb 13 has a hexagonal cross-section.
  • the respective honeycomb 13 forming and laterally interconnected walls 14 extend between the two cover layers 12.
  • a recess 15 is milled.
  • a drive system 16 is used.
  • This drive system 16 is formed by a so-called yoke arrangement 17.1- 17.4, a permanent magnet 18 and a provided with a voice coil 19 voice coil bobbin 20.
  • the parts of the yoke assembly 17.1- 17.3 form a return pot.
  • the permanent magnet 18 and the part 17.4 are inserted in the return pot formed from the parts 17.1-17-3.
  • an air gap 21 is left in the unit of permanent magnet 18 and the parts of the yoke assembly 17.1- 17.4, in which the provided with the voice coil 19 voice coil bobbin 20 is immersed.
  • a holder 22 is present, which is connected to the part 17.2 of the yoke arrangement and the core layer 11.
  • bracket 22 -as in FIG. 1 is covered with the lower cover layer 12.2 is not necessary for the function of the sound reproducing assembly 10.
  • the lower cover layer 12.2 is omitted in another embodiment (not shown) in the region of the holder 22, it can, if it has a good thermal conductivity, also be used as a cooling plate for the drive system 16.
  • the as Cooling plate-acting bracket 22 may also be provided with cooling fins (not shown).
  • FIG. 1 can be further removed by the puncturing, the honeycomb 13.1- 13.5, which adjoins the recess axially and radially directly, are foamed with a plastic material.
  • the stability of the arrangement in the region of the drive system 16 is improved.
  • a good introduction of force is ensured by the foaming of the honeycomb 13.2 and 13.4, since the voice coil bobbin 20 is coupled to the core layer 11 in the region of these honeycomb 13.2 and 13.4.
  • the bottom 23 of the recess 15, even if the honeycomb 13.2 and 13.4 are filled with foam in another embodiment not shown, even with a pressure plate 25 may be equipped.
  • FIG. 2 shows one opposite FIG. 1
  • the drive system 16 inserted into the recess 15 is formed only by an annular permanent magnet 18 and a voice coil 19.
  • the permanent magnet 18, which in contrast to the permanent magnet 18 according to FIG. 1 is radially magnetized to the center line shown is connected directly to the core layer 11.
  • the voice coil 19 is to save a voice coil bobbin (20) directly connected to the creation of the recess 21 not milled (outer) wall 14 of the honeycomb 13.3 and dives together with the walls 14 of the honeycomb 13.3 in the recess 21.1 of the annular permanent magnet eighteenth one.
  • the honeycomb 13.2 - 13.4 filled with plastic material shown dotted).
  • the lower cover layer 12.2 can furthermore be supported relative to the bottom 23 of the recess 15 by means of an intermediate piece 11 ', this intermediate piece 11' also being formed by the core layer 11 can.
  • the voice coil bobbin 20 in the radial direction of the next and connected to the permanent magnet 18 areas of the core layer 11 have a diameter D1, which in this embodiment twice the diameter D2 of Voice coil carrier 20 and the voice coil 19 corresponds.
  • FIG. 3 a sound reproduction device 10 is shown in which in the recess 15, a piezoelectric drive system 16 'is arranged.
  • the drive system 16 ' is made of a disk 24 of piezoelectric Material, a pressure plate 25 and a seismic mass 26 is formed.
  • the pressure plate 25 is connected directly to the bottom 23 of the recess 15.
  • At the side facing away from the upper cover layer 12.1 side of the pressure plate 25 includes the disc 24 of piezoelectric material.
  • the seismic mass 26 is connected to the pressure plate 25 opposite side of the disc 24.
  • the disk 24 is designed as a so-called bending or thickness oscillator is of no significance for the sound reproduction arrangements in question, although the so-called flexural vibrators, in addition to the lower weight and a larger amplitude, are also much better adapted to the relevant application in terms of impedance.
  • the disc 24 of piezoelectric material can be connected to the core layer 11 even without interposing a pressure plate 25 when the core layer 11 and / or the foaming used has sufficient stability.
  • the disc 24 can be used without seismic mass 26.
  • FIG. 4 is one of the FIG. 1 similar embodiment shown. Deviating from this, only the drive system 16 inserted into the recess 15 is configured. This is formed by two permanent magnets 18.1, 18.2, a yoke plate 17.5 and a voice coil 19. The two permanent magnets 18.1, 18.2, which like the permanent magnet 18 according to FIG. 1 are magnetized toward the center line shown are connected to two opposite sides of the yoke plate 17.5 with this. The permanent magnet 18.1 is fixed to the bottom 23 of the recess 15.
  • the voice coil 19 is not connected to the bottom 23 of the recess 15, but with the recess 15 in the radial direction limiting side surfaces 28, which are formed by the foaming shown dotted.
  • a separate voice coil bobbin 20 may be arranged.
  • the latter also implies that such a voice coil bobbin 20 - similar to in FIG. 2 - consists of honeycomb 13 forming walls 14 directly.
  • the recess 15 and the mutual Zent ist of voice coil 19 and magnet system 17; 18 are used when the recess 15 is equipped with corresponding steps 27.
  • the voice coil bobbin 20 is formed by the wall 14 of the honeycomb 13.3, that this honeycomb 13.3 is left standing during the milling of the recess, automatically results in the proper mutual assignment of voice coil bobbin 20 and voice coil 19 to the permanent magnet 18, if this as in FIG. 2 shown its end position has taken on the step 27 in the recess 15.
  • the recess 15 also for centering of the voice coil 19 and magnet system 17; 18 are used, the bottom 23 with a step 27 '(shown in phantom) should be provided, in which then the permanent magnet 18.1 can engage when the magnet system 17, 18 has taken its final position in the recess 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP98123819A 1997-12-20 1998-12-15 Schallwiedergabeanordnung Expired - Lifetime EP0924959B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19757097 1997-12-20
DE19757097A DE19757097B4 (de) 1997-12-20 1997-12-20 Schallwiedergabeanordnung

Publications (3)

Publication Number Publication Date
EP0924959A2 EP0924959A2 (de) 1999-06-23
EP0924959A3 EP0924959A3 (de) 2005-04-20
EP0924959B1 true EP0924959B1 (de) 2009-11-25

Family

ID=7852891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98123819A Expired - Lifetime EP0924959B1 (de) 1997-12-20 1998-12-15 Schallwiedergabeanordnung

Country Status (4)

Country Link
US (1) US6275598B1 (ja)
EP (1) EP0924959B1 (ja)
JP (1) JPH11252673A (ja)
DE (2) DE19757097B4 (ja)

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Publication number Priority date Publication date Assignee Title
DE19821860A1 (de) 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Treiber für flaches Klangpaneel
DE19821855A1 (de) 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Plattenlautsprecher
DE19821862A1 (de) 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Schallwiedergabeanordnung
DE19825866A1 (de) 1998-06-10 1999-12-16 Nokia Deutschland Gmbh Plattenlautsprecher
DE19840375C2 (de) 1998-09-04 2003-08-28 Harman Audio Electronic Sys Schallwand
DE19843079A1 (de) 1998-09-19 2000-03-23 Nokia Deutschland Gmbh Multiresonanzplatte
DE10001410C2 (de) * 2000-01-14 2001-12-06 Harman Audio Electronic Sys Flachlautsprecheranordnung
DE10025460B4 (de) 2000-05-23 2004-03-18 Harman Audio Electronic Systems Gmbh Hochtonlautsprecher
DE10058102C2 (de) * 2000-11-23 2003-07-03 Harman Audio Electronic Sys Elektrodynamischer Biegemomententreiber
DE10058104C2 (de) 2000-11-23 2003-10-30 Harman Audio Electronic Sys Elektromagnetischer Treiber für einen Plattenlautsprecher
US7187776B2 (en) * 2001-07-13 2007-03-06 Harman Becker Automotive Systems Gmbh Planar loudspeaker
US7109959B2 (en) 2002-02-06 2006-09-19 Andersen Corporation Multi-task window
US7180489B2 (en) * 2002-02-06 2007-02-20 Andersen Corporation Automated multi-task window assembly
GB0221503D0 (en) * 2002-09-17 2002-10-23 1 Ltd Loudspeaker
DE102007035189A1 (de) * 2007-07-25 2009-02-05 Siemens Ag Vorrichtung zum Einkoppeln mechanischer Schwingungen in ein flächiges, biegesteifes Schallabgabeelement und Flächenlautsprecher
DE102008027385B4 (de) * 2008-06-09 2019-04-25 Fischer Profil Gmbh Sandwichelement für die Erstellung von Wänden und Dächern
NL1038214C2 (nl) * 2010-09-01 2012-03-05 Verburg Audio B V Meubel met geintegreerde luidspreker en werkwijzen voor het integreren van een luidspreker in een m eubel.
US9154862B2 (en) * 2013-06-27 2015-10-06 The Boeing Company Flat panel loudspeaker system
DE102021124624A1 (de) 2021-09-23 2023-03-23 LiMES - Immersive Solutions GmbH Schallwand

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Also Published As

Publication number Publication date
JPH11252673A (ja) 1999-09-17
DE19757097B4 (de) 2004-04-15
EP0924959A3 (de) 2005-04-20
US6275598B1 (en) 2001-08-14
DE19757097A1 (de) 1999-06-24
DE59814415D1 (de) 2010-01-07
EP0924959A2 (de) 1999-06-23

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