EP1079664B1 - Moteur électrodynamique - Google Patents

Moteur électrodynamique Download PDF

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Publication number
EP1079664B1
EP1079664B1 EP00118512A EP00118512A EP1079664B1 EP 1079664 B1 EP1079664 B1 EP 1079664B1 EP 00118512 A EP00118512 A EP 00118512A EP 00118512 A EP00118512 A EP 00118512A EP 1079664 B1 EP1079664 B1 EP 1079664B1
Authority
EP
European Patent Office
Prior art keywords
pressure balancing
adapter
electrodynamic driver
driver
membrane
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
EP00118512A
Other languages
German (de)
English (en)
Other versions
EP1079664A3 (fr
EP1079664A2 (fr
Inventor
Wolfgang Dr. Bachmann
Gerhard Dr. 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 EP1079664A2 publication Critical patent/EP1079664A2/fr
Publication of EP1079664A3 publication Critical patent/EP1079664A3/fr
Application granted granted Critical
Publication of EP1079664B1 publication Critical patent/EP1079664B1/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia
    • 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 an electrodynamic driver for a membrane having a voice coil applied to a tubular coil carrier, a concentrically arranged with respect to the voice coil, axially movable magnet system, an adapter for securing the coil carrier to the membrane, an arranged between the membrane and magnet system elastic element, wherein forms at least one cavity between the membrane and the magnet system.
  • the publication US 5,909,015 describes a self-cooling speaker with a permanent magnet assembly having at least one air inlet.
  • the publication US 5,426,707 refers to a speaker with a cooling element for generating an air flow for cooling the electrical conductors in the speaker.
  • the publication DE 44 21 418 A1 relates to a centering diaphragm for loudspeakers, wherein the centering diaphragm formed of non-magnetizable material and means are provided which allow the exchange of air between the areas located above and below the centering diaphragm.
  • the publication DE 29 19 884 A1 also describes electromechanical vibration transducers.
  • Plate loudspeakers consist essentially of a holder (frame), a membrane (plate) and a drive system.
  • the drive system of the panel loudspeaker consists of one or more electromechanical transducers.
  • piezoelectric drivers PVDF films or piezo ceramics
  • electrodynamic drivers magnetodynamic drivers
  • the oscillating head of the electrodynamic driver consists of the voice coil, the coil carrier, an elastic element and the adapter.
  • an adapter is any suitable for anchoring the bobbin on the plate suitable connection element designated.
  • Such a generic driver is for example from the European patent EP 0 847 676 B1 known. However, the transmission quality of the drivers is still considered too low for some applications.
  • the object of the invention is to further improve an electrodynamic driver of the type mentioned.
  • an adapter for securing the bobbin to the membrane and an arranged between the membrane and magnet system elastic element usually form Cavities between membrane and magnet system.
  • the air trapped therein acts as an additional elastic element upon movement of the membrane, which itself is dependent on external influences (e.g., air pressure, temperature) and, in turn, correspondingly affects the transmission characteristics of the driver.
  • the invention therefore provides means for pressure equalization of the at least one cavity.
  • pressure equalization air-permeable elements eg coarse-pored tissue, fleece
  • pressure equalization channels eg bore, groove, notch
  • at least one cavity can have a pressure compensation opening (eg windows, slots) to the outside air.
  • cavities and means for pressure equalization between at least two cavities can be provided. These may be connected to each other again via air-permeable elements and / or pressure equalization channels and / or have a common pressure equalization opening.
  • the pressure equalization openings can be incorporated into the elastic element.
  • a circumferential bead can be provided, which has at least one pressure equalization opening and / or is permeable to air.
  • the magnet system and / or the adapter may also have at least one pressure compensation opening and / or a pressure equalization channel that is in contact with at least one cavity.
  • the above-explained pressure compensation openings serve on the one hand the dynamic and on the other hand the static pressure compensation. In addition, they provide cooling of the driver system.
  • electrodynamic driver 1 is a tubular coil support 8a, on which a coil 8 is wound, by means of a consisting of an adapter plate 9a and an adapter foot 9b, concentric, one-piece adapter 9 attached to a plate membrane 12.
  • a magnet system is arranged, which forms an air gap 18, in which the coil 8 and partly the coil carrier 8a dip.
  • the magnet system consists of a ferromagnetic magnetic pot 4 which surrounds the coil 8 on its lateral surface and on the cross-sectional surface opposite the plate membrane 12, and of a permanent magnet 5 arranged in the interior of the magnet pot 4 and the coil support 8a in conjunction with a pole disk 6
  • a concentric housing 3 extending in the radial direction away from the magnet pot 4 and axially towards the plate membrane 12 is fastened, to which in turn the ends of two beads (a centering bead 7 and a load bead 2) are attached , The other end of the centering bead 7 is with the adapter 9 and the other end of the load bead. 2 is connected in the opposite direction with the plate membrane 12.
  • the load bead 2 has the task of fixing the magnet system (magnet pot 4, permanent magnet 5 and pole disc 6) to the plate diaphragm 12 (soft springy for axial movement, hard spring for radial and tilting movements).
  • the load bead 2 could also extend further outward from the outer edge of the magnet system or further inwards. But it could also be omitted in a different type of holder.
  • the centering bead 7 has the task of fixing the oscillating head (voice coil 8, coil carrier 8a and adapter 9) to the magnet system (soft springy for axial movement, hard-springing for radial and tilting movements).
  • the centering bead 7 could also extend from the outer edge of the oscillating head further outwards or further inwards. With different types of holder, it could be completely eliminated.
  • the load bead 2 consists of a separate component. However, it may also be part of the housing 3 itself, if this consists of compound material in which the magnetic system receiving housing part formed hard and the Lastsickenteil for the purpose of cushioning made of softer material.
  • Another cavity (housing chamber 11) is defined by the housing 3, the centering bead 7, the adapter 3, the voice coil 8 with coil holder 8 a and the air gap 18.
  • a magnet chamber 10 called cavity by the magnet pot 4, the permanent magnet 5, the pole disc 6, the voice coil 8 is enclosed with coil support 8a and the air gap 18 and a pole chamber 13 said cavity by adapter 9, the coil holder 8a and the pole disc 6 set wherein in the embodiment, the axial height hp of the pole chamber 13 is advantageously less than the free height hm in the magnetic chamber 10.
  • Another Cavity (adapter chamber 15) is finally formed by the adapter 9 in conjunction with the plate membrane 12.
  • the load bead 2 was provided in the embodiment according to the invention with a perforation through the pressure equalization openings 19 can take place an exchange of air with the outside air, whereby the same pressure in the beading chamber 17 as in the outside air is achieved.
  • a pressure equalization of the housing chamber 11 and the adapter chamber 15 takes place.
  • the centering bead 7 made of air-permeable material, for example made of coarse-pored elastic fabric having a plurality of small pressure equalization openings 20.
  • the adapter 9 has a bore which leads from the Sikkensch 17 to the adapter chamber 15 and serves as a pressure equalization opening 16 between these two chambers.
  • a pressure compensation opening 14 is provided between the adapter chamber 15 and pole chamber 13, wherein the pole chamber 13 is also connected to the housing chamber 11 via a serving as a pressure equalization opening 21 bore in the coil holder 8a. Since the air gap 18 is usually too small an effective cross-section for pressure equalization, provided as a pressure equalization opening 24 bore in the magnet pot 4 is inserted such that it connects the magnetic chamber 10 with the outside air. Thus, two cavities are directly in connection with the outside air, while the other cavities indirectly at least via these two and optionally further cavities also with the Have outside air contact. This ensures that there is always external pressure in all cavities.
  • Such pressure compensation openings are particularly advantageous, even necessary, if ferrofluid is used in the air gap, which would prevent the pressure equalization.
  • FIG. 1 embodiment shown is the embodiment according to FIG. 2 Modified to the effect that the housing 3, centering 7 and 2 load bead FIG. 1 omitted.
  • the pole disk 6 in the embodiment according to FIG. 2 formed in cross-section T-shaped and is in contact with a combined centering and load bead 23, in which an adapter foot part 23a, an adapter head part 23c and an intermediate flexible adapter intermediate ring 23c are incorporated.
  • the adapter with adapter foot part 23 a, adapter head part 23 c and adapter intermediate ring 23 c are used to attach the driver to the sound board 12th
  • Cavities form in this embodiment, in particular in the interior of the adapter (adapter chamber 15), between adapter, voice coil 8 and pole disc 6 (Polhunt 13) and between Polin 6, permanent magnet 5 and magnetic pot 4 (magnetic chamber 10).
  • a pressure equalization port 14 adapter chamber 15 and pole chamber 13 are connected to each other, wherein the adapter chamber 15 is in communication via a pressure equalization opening at 16 with the outside air.
  • the pressure equalization of the magnetic chamber 10 is carried out except the air gap 18 by means of a formed by a hole in the magnet pot pressure equalization port 24
  • a bore through the bobbin 8a are provided as a pressure equalization opening 21 (in FIG. 2 Not shown).

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electric Cable Installation (AREA)

Claims (11)

  1. Actionneur électrodynamique pour une membrane (12), comprenant une bobine mobile (8) disposée sur un support de bobine tubulaire (8a), un système magnétique (4, 5, 6) mobile dans le sens axial et disposé concentriquement par rapport à la bobine mobile (8), un adaptateur (9) pour fixer le support de bobine (8a) sur la membrane (12), un élément élastique (2, 7, 23b) disposé entre la membrane (12) et le système magnétique (4, 5, 6), dans lequel au moins une cavité (10, 11, 15, 17) est formée entre la membrane (12) et le système magnétique (4, 5, 6), caractérisé en ce qu'un élément (7) constitué d'un matériau perméable à l'air, qui est en contact avec l'air extérieur, est prévu pour compenser la pression d'au moins une cavité (10, 11, 15, 17).
  2. Actionneur électrodynamique selon la revendication 1, caractérisé en ce qu'au moins un canal de compensation de pression (24, 16), qui s'étend depuis la cavité (10, 14) jusqu'à l'air extérieur, est prévu.
  3. Actionneur électrodynamique selon la revendication 1 ou 2, caractérisé en ce qu'au moins une cavité (17) présente une ouverture de compensation de pression (19) vers l'air extérieur.
  4. Actionneur électrodynamique selon l'une des revendications 1 à 3, caractérisé en ce que plusieurs cavités (10, 11, 15, 17) sont formées et que des moyens pour compenser la pression (16, 18, 20, 21) entre au moins deux cavités (10, 11, 15, 17) sont prévus.
  5. Actionneur électrodynamique selon la revendication 4, caractérisé en ce qu'au moins deux cavités (11, 17) sont reliées entre elles par le biais d'un élément perméable à l'air (7).
  6. Actionneur électrodynamique selon la revendication 4 ou 5, caractérisé en ce qu'au moins un canal de compensation de pression (16) relie au moins deux cavités (15, 17).
  7. Actionneur électrodynamique selon l'une des revendications 4 à 6, caractérisé en ce qu'au moins deux cavités (13, 15) présentent une ouverture de compensation de pression (14) commune.
  8. Actionneur électrodynamique selon l'une des revendications précédentes, caractérisé en ce que l'élément élastique (2, 7) présente au moins une ouverture de compensation de pression (19) et/ou est perméable à l'air (20).
  9. Actionneur électrodynamique selon la revendication 4, caractérisé en ce qu'un bourrelet circulaire (2, 7), qui présente au moins une ouverture de compensation de pression (19) et/ou est perméable à l'air (20), est prévu à titre d'élément élastique.
  10. Actionneur électrodynamique selon l'une des revendications précédentes, caractérisé en ce que le système magnétique (4, 5, 6) présente au moins une ouverture de compensation de pression (18) et/ ou au moins un canal de compensation de pression (10).
  11. Actionneur électrodynamique selon l'une des revendications précédentes, caractérisé en ce que l'adaptateur (9) comprend au moins une ouverture de compensation de pression (14) et/ou au moins un canal de compensation de pression (16).
EP00118512A 1999-08-27 2000-08-25 Moteur électrodynamique Expired - Lifetime EP1079664B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19940930A DE19940930A1 (de) 1999-08-27 1999-08-27 Elektrodynamischer Treiber
DE19940930 1999-08-27

Publications (3)

Publication Number Publication Date
EP1079664A2 EP1079664A2 (fr) 2001-02-28
EP1079664A3 EP1079664A3 (fr) 2007-03-07
EP1079664B1 true EP1079664B1 (fr) 2011-10-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00118512A Expired - Lifetime EP1079664B1 (fr) 1999-08-27 2000-08-25 Moteur électrodynamique

Country Status (3)

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EP (1) EP1079664B1 (fr)
AT (1) ATE530030T1 (fr)
DE (1) DE19940930A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7187776B2 (en) 2001-07-13 2007-03-06 Harman Becker Automotive Systems Gmbh Planar loudspeaker
US8724844B2 (en) * 2010-06-07 2014-05-13 Robert Katz Heat dissipating acoustic transducer with mounting means
CN105594225B (zh) * 2013-09-30 2019-01-04 苹果公司 防水扬声器模块
JP6146289B2 (ja) * 2013-12-11 2017-06-14 ヤマハ株式会社 加振器の取付構造
US9226076B2 (en) 2014-04-30 2015-12-29 Apple Inc. Evacuation of liquid from acoustic space
US10209123B2 (en) 2016-08-24 2019-02-19 Apple Inc. Liquid detection for an acoustic module
CN109348375A (zh) * 2018-11-29 2019-02-15 深圳倍声声学技术有限公司 一种动铁扬声器和耳机

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354067A (en) * 1978-05-17 1982-10-12 Bodysonic Kabushiki Kaisha Audio-band electromechanical vibration converter
EP0039740B1 (fr) * 1979-11-09 1985-06-26 Matsushita Electric Industrial Co., Ltd. Haut-parleur
DE3923189A1 (de) * 1989-07-13 1991-01-24 Atl Elektro Akustik Vertriebs Lautsprecher
EP0574387A1 (fr) * 1990-10-09 1993-12-22 Stage Ac-Company B.V. Haut-parleur electrodynamique comportant un dispositif de refroidissement
DE4421418A1 (de) * 1994-06-01 1995-12-07 Nokia Deutschland Gmbh Zentriermembran
US5497428A (en) * 1994-11-01 1996-03-05 Rojas; Omar E. Self-cooled magnetic structure for loudspeakers
US5909015A (en) * 1998-03-26 1999-06-01 Yamamoto; Shuji Self-cooled loudspeaker

Also Published As

Publication number Publication date
EP1079664A3 (fr) 2007-03-07
ATE530030T1 (de) 2011-11-15
DE19940930A1 (de) 2001-03-29
EP1079664A2 (fr) 2001-02-28

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