EP1410680A1 - Haut-parleur a plaque - Google Patents

Haut-parleur a plaque

Info

Publication number
EP1410680A1
EP1410680A1 EP01965127A EP01965127A EP1410680A1 EP 1410680 A1 EP1410680 A1 EP 1410680A1 EP 01965127 A EP01965127 A EP 01965127A EP 01965127 A EP01965127 A EP 01965127A EP 1410680 A1 EP1410680 A1 EP 1410680A1
Authority
EP
European Patent Office
Prior art keywords
plate
bridge
loudspeaker according
sound
damper
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.)
Granted
Application number
EP01965127A
Other languages
German (de)
English (en)
Other versions
EP1410680B1 (fr
Inventor
Wolfgang Bachmann
Gerhard Krump
Hans-Jürgen Regl
Andreas Ziganki
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 EP1410680A1 publication Critical patent/EP1410680A1/fr
Application granted granted Critical
Publication of EP1410680B1 publication Critical patent/EP1410680B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the invention relates to a plate loudspeaker with a light, thin sound plate that can be excited to reflect flex waves, a peripheral frame that holds the sound plate in an articulated manner, at least one driver connected to the sound plate to excite the sound plate, and at least one driver with the at least one driver the bridge firmly connecting the frame.
  • rigid plate loudspeakers are known from US Pat. No. 5,701,359 which operate on the principle of the free piston, the sound-emitting surface (“membrane”) being rigid (like a “piston”).
  • membrane the sound-emitting surface
  • the sound-radiating surface does not perform any significant bending vibrations in the operating frequency range and that the rigid plate provided as the sound-radiating surface is free, that is to say it is open and not airtightly enclosed by a housing.
  • multi-resonance plate loudspeakers are known, for example, from WO 97/09842, weakly damped bending waves occurring in the operating frequency range being reflected at the edge of the plate, so that the membrane becomes a multiple resonator as a result of the formation of standing waves.
  • Such multi-resonance plate loudspeakers are also referred to as “multi-resonance sound plates”, “flexible shaft loudspeakers” or “distributed mode speakers”. Even with such loudspeakers, the plate is usually free, that is to say not part of a closed box.
  • the usual electrodynamic plate drivers can in principle be fixed in a floating manner on the plate, ie without being supported on a frame. The mass of the magnet system then forms the dynamic counter-bearing for the application of force to the plate to be driven (principle of the "seismic mass").
  • the object of the invention is therefore to provide a panel loudspeaker with settlement protection, in which the dynamic side effects of such settlement protection are avoided.
  • a plate loudspeaker of the type mentioned at the outset by connecting the bridge or at least one of the bridges to a (preferably rigid) damper plate.
  • the bridge not only carries the driver or drivers, but also the damper plate.
  • the bridge resonance frequency can be tuned, for example, by mass adaptation.
  • the bridge resonance is determined by the ratio of spring constant to total bridge mass with all elements attached to it. Regardless of the damping given by the plate surface of the damping plate, the mass can be adjusted by changing the plate thickness or the plate density of the damping plate so that the radiation contribution of the damping plate fits into the acoustic spectrum of the multi-resonance plate loudspeaker.
  • the bridge resonance frequency can also be tuned by adjusting the spring.
  • the area moment of inertia and thus the spring constant can be adjusted by changing, for example, the cross-sectional profile of the bridge, so that the resonance zone of the bridge fits in favorably with the acoustic spectrum of the multi-resonance plate loudspeaker.
  • At least one bridge is designed as an air-permeable framework.
  • at least one bridge can also be designed as an airtight flat box cover.
  • the damper plate preferably has a smaller area than the sound plate. Furthermore, it is preferably provided that the damper plate is designed in a light, very rigid sandwich construction. Such a sandwich design is known for example from EP 0 924 959.
  • connection points between the bridge (s) and the damper plate can lie in the region of the node lines of the first two vibration modes of the damper plate.
  • the damper plate itself can also be part of at least one bridge.
  • At least one bridge consists of a prismatic rod, the bridge being the not completely covering the surface given by the frame opposite the sound plate.
  • At least one bridge is designed as a regular lattice work and / or as a perforated plate.
  • At least one bridge to be resilient and part of an airtight flat box, all of the outer components of this flat box being airtight and being airtight.
  • the flat box can have a bass reflex opening (also a bass reflex tube).
  • At least one bridge can be designed as a rigid plate and connected to the damper plate by a circumferential bridge bead.
  • a chamber can also be attached to the flat box, the chamber also being able to have a bass reflex opening (also a bass reflex tube).
  • the chamber can also be airtight.
  • the chamber can also have a passive radiator.
  • the plate loudspeaker according to the invention therefore represents an asymmetrical two-plate loudspeaker in its acoustic effect, since the main front sound plate facing the listener forms an acoustic multi-resonance sound plate, while the smaller damper plate facing away from the listener is acoustically a rigid plate.
  • the degree of damping can be set directly via the surface of the damper plate. The larger the plate, the greater the damping achieved.
  • An additional improvement The low-frequency sound radiation from the plate loudspeaker can be achieved by designing the damper plate as a rigid plate and thus not only dampening the bridge resonance vibration, but also contributing to sound radiation in the low-frequency range.
  • the low frequency range of free multi-resonance sound plates is always affected by the dipole short circuit. The additional sound radiation partially compensates for this dipole short circuit.
  • a particular advantage of the asymmetrical two-panel loudspeaker is the simple drive technology. While known monopole drivers (cf. DE 198 218 62) consist of single drivers arranged back-to-back, alternatively single-side arranged single drivers or complicated double voice coil arrangements, according to the invention only at least one known conventional plate driver is required.
  • the two plates work in opposite directions in the low frequency range.
  • the arrangement of the two plates then forms a "low-frequency monopole radiator", ie a breathing sphere with partially inactive zones.
  • a flat box arrangement it is ventilated in a controlled manner.
  • one or more bass reflex openings are provided, through which inside air can flow out in phase, so that a further improvement in the low-frequency behavior is achieved.
  • the ventilation of the flat box also avoids the unfavorable effect of air suspension that is too rigid.
  • the sealing of the rigid damper plate which is originally not provided for sound radiation and is in one plane with the rear flat box wall, can be designed as a flat leaf spring, so that an enlarged radiation area is achieved with the associated increased radiation attenuation.
  • This flat plate spring detunes the spring constant of the original bridge, which has to be taken into account when tuning the resonance.
  • FIG. 1 shows a first preferred embodiment of a plate loudspeaker according to the invention as a free, asymmetrical two-plate loudspeaker in which the damper plate is fastened to a bridge,
  • FIG. 2 shows a second preferred embodiment of a plate loudspeaker according to the invention as a free, asymmetrical two-plate loudspeaker, in which the damper plate takes over part of the bridge function
  • FIG. 3 shows a third preferred embodiment of a plate loudspeaker according to the invention as a free, asymmetrical two-plate loudspeaker, in which the bridge bars simulate a disc spring
  • FIG. 4 shows a fourth preferred embodiment as a closed, asymmetrical two-plate loudspeaker
  • FIG. 5 shows a fifth preferred embodiment of a plate loudspeaker according to the invention as a closed, asymmetrical two-plate loudspeaker with bass reflex opening
  • FIG. 6 shows a sixth preferred embodiment of a plate loudspeaker according to the invention as a closed, asymmetrical two-plate loudspeaker with a rigid plate bridge and bridge bead and
  • FIG. 8 shows a seventh preferred embodiment of a plate loudspeaker according to the invention as a closed, asymmetrical two-plate loudspeaker with two chambers and with a rigid plate bridge, bridge bead and bass reflex opening.
  • a sound plate 2 is provided as the membrane, which is designed as a multi-resonance sound plate and is consequently characterized by a low mass, a large bending stiffness, a low bending wave damping and a cantilever frame fastening distinguishes.
  • a rigid, mostly circumferential frame 3 holds the sound plate 2 over a circumferential plate bearing 4, which acts as a shear-resistant steering acts.
  • the static load of the magnet system 6 is thereby borne.
  • a voice coil 7 immersed in the annular gap of the magnet system 6 is centered on the one hand by means of an inner bead 10 with respect to the magnet system 6 and at the same time firmly connected to the sound plate 2.
  • An outer bead 9 holds the static load of the magnet system 6 during speaker assembly. At the same time, it represents a floating magnetic attachment, as is useful for horizontal operation.
  • the frame 3 and / or the bridge 5 contains openings 11 (gaps) through which a pressure equalization of the air which is otherwise enclosed is ensured.
  • the free, asymmetrical two-plate loudspeaker 1 has one
  • Damper plate 14 which is attached to the prepared bridge 13 of the sound plate 2 facing away.
  • the large plate area of the damper plate 14 is aligned approximately plane-parallel to the large plate area of the sound plate 2.
  • FIG. 2 shows in section a further preferred embodiment of a plate loudspeaker according to the invention designed as a free, asymmetrical two-plate loudspeaker 12, the damper plate 14 being attached directly to the magnet system 6.
  • Relatively short bridge bars 16 connect the damper plate 14 to the frame 3.
  • the damper plate 14 thus represents a widened part of the bridge 15 formed from the bridge bars 16 and thus exercises Function of the bridge 15 as a static weight relief.
  • the large plate area of the damper plate 14 is again aligned approximately plane-parallel to the large plate area of the sound plate 2.
  • the embodiment shown in FIG. 2 corresponds to the embodiment shown in FIG. 1.
  • FIG. 3 shows a further preferred embodiment of a plate loudspeaker according to the invention as a free asymmetrical two-plate loudspeaker 17, in contrast to the embodiment shown in FIG. 2 only the bridge bars 16 being replaced by a circumferential disc spring 18.
  • the static function of the plate spring 18 is the same as that of the bars 16 in FIG. 2, but there is a different acoustic behavior.
  • the sound plate 2 is in fact shielded against a possibly existing, near building wall and thus forms a helpful measure against the undesirable “wall effect”.
  • a closed, asymmetrical two-plate loudspeaker 19 is provided, in contrast to FIG. 3 all remaining ventilation openings 11 having been closed.
  • the suspension caused by the cover 20 is substantially hardened by the compression suspension of the enclosed air.
  • FIG. 5 shows in section an inventive plate loudspeaker designed as an asymmetrical two-plate bass reflex loudspeaker 21.
  • the exemplary embodiment according to FIG. 6 differs from the exemplary embodiment shown in FIG. 5 in that an asymmetrical two-plate loudspeaker 24 according to the invention, starting from the embodiment according to FIG. 5, has a rigid plate bridge 25 and a bridge bead 26, the damper plate 14 also being connected via the bridge bead 26 the plate bridge 25 is connected to oscillate.
  • the plate bridge 25 is attached to the frame 3.
  • the preferred embodiment of a plate loudspeaker according to the invention shown in section in FIG. 7 as a closed, asymmetrical two-plate two-chamber loudspeaker 27, starting from the exemplary embodiment according to FIG. 6, comprises, in addition to the rigid plate bridge 25 and the bridge bead 26, a second chamber 28 which is equipped with a bass reflex tube 23 is.
  • the second chamber 28 adjoins the rear end of the two-plate two-chamber loudspeaker 27, that is to say on the side of the two-plate two-chamber loudspeaker 27 that includes the damper plate 14.
  • the second chamber 28 can also be closed or have a passive radiator 29.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

Haut-parleur à plaque comprenant une plaque de tonalité (2), légère et mince, pouvant être activée par des ondes de flexion multi-réfléchies, un cadre (3) entourant ladite plaque de tonalité (2) tout en la supportant de manière articulée et résistant au cisaillement, au moins un circuit d'attaque (6, 7, 9, 10) connecté avec la plaque de tonalité (2) et destiné à activer celle-ci (2) et au moins l'un des ponts (13, 16, 18, 20, 22, 25) reliant rigidement au moins un circuit d'attaque (6, 7, 9, 10) avec le cadre (3), caractérisé en ce que les ponts, ou au moins l'un des ponts (13, 16, 18, 20, 22, 25), sont connectés avec une plaque amortissante (14).
EP01965127A 2001-07-13 2001-07-13 Haut-parleur a plaque Expired - Lifetime EP1410680B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2001/008104 WO2003013186A1 (fr) 2001-07-13 2001-07-13 Haut-parleur a plaque

Publications (2)

Publication Number Publication Date
EP1410680A1 true EP1410680A1 (fr) 2004-04-21
EP1410680B1 EP1410680B1 (fr) 2010-12-15

Family

ID=8164508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01965127A Expired - Lifetime EP1410680B1 (fr) 2001-07-13 2001-07-13 Haut-parleur a plaque

Country Status (4)

Country Link
US (1) US7187776B2 (fr)
EP (1) EP1410680B1 (fr)
DE (1) DE50115744D1 (fr)
WO (1) WO2003013186A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9380387B2 (en) 2014-08-01 2016-06-28 Klipsch Group, Inc. Phase independent surround speaker

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1480489A3 (fr) * 2003-05-23 2009-07-01 Alps Electric Co., Ltd. Système d'excitation pour la génération de sons
DE102005058175A1 (de) * 2005-12-05 2007-06-06 Volkswagen Ag Lautsprecheranordnung zur Beschallung in einem Kraftfahrzeug
WO2007093903A1 (fr) * 2006-02-16 2007-08-23 Bang & Olufsen Icepower A/S Micro-transducteur avec une qualité de son perçu améliorée
JP4784398B2 (ja) * 2006-05-29 2011-10-05 パナソニック株式会社 音響加振器およびこれを用いたスピーカ
JP2009076834A (ja) * 2006-11-27 2009-04-09 Fujifilm Corp 有機電界発光素子および新規なインドール誘導体
US10412499B2 (en) * 2017-10-13 2019-09-10 Harish Bhutani Loudspeaker driver/exciter with unique design to facilitate mounting
DE102018124261B4 (de) * 2018-10-01 2020-06-04 Grawe & Schneider GdbR (vertretungsberechtigte Gesellschafter: Thomas Grawe, 83088 Kiefersfelden und Gerd-Peter Schneider, 84032 Landshut) Planarlautsprecher
US10674270B2 (en) * 2018-10-24 2020-06-02 Google Llc Magnetic distributed mode actuators and distributed mode loudspeakers having the same
DE102019205628A1 (de) * 2019-04-17 2020-10-22 BSH Hausgeräte GmbH Vorrichtung zur Wiedergabe von haptischen Signalen und Audiosignalen
NL2031944B1 (en) * 2022-05-20 2023-11-27 Microsoft Technology Licensing Llc Tuning spring mass resonator of loudspeaker in mobile device
CN115334423A (zh) * 2022-09-13 2022-11-11 歌尔股份有限公司 激励器和电子设备

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Publication number Priority date Publication date Assignee Title
US5701359A (en) 1995-04-06 1997-12-23 Precision Power Flat-panel speaker
GB9807316D0 (en) * 1998-04-07 1998-06-03 New Transducers Ltd Loudspeaker
PL334440A1 (en) * 1997-01-09 2000-02-28 New Transducers Ltd Loudspeaker
DE19757097B4 (de) 1997-12-20 2004-04-15 Harman Audio Electronic Systems Gmbh Schallwiedergabeanordnung
DE19821862A1 (de) 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Schallwiedergabeanordnung
JP2000050384A (ja) 1998-08-03 2000-02-18 Sony Corp スピーカ装置
DE19922395C1 (de) 1999-05-14 2001-01-11 Harman Audio Electronic Sys Deckenelement
EP1206897A2 (fr) * 1999-07-23 2002-05-22 Digital Sonics, Llc Haut-parleur panneau plat
DE19940930A1 (de) 1999-08-27 2001-03-29 Harman Audio Electronic Sys Elektrodynamischer Treiber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03013186A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9380387B2 (en) 2014-08-01 2016-06-28 Klipsch Group, Inc. Phase independent surround speaker

Also Published As

Publication number Publication date
EP1410680B1 (fr) 2010-12-15
DE50115744D1 (de) 2011-01-27
WO2003013186A1 (fr) 2003-02-13
US20050031155A1 (en) 2005-02-10
US7187776B2 (en) 2007-03-06

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