EP1094686B1 - Lautsprecher für mobile Telefon - Google Patents

Lautsprecher für mobile Telefon Download PDF

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Publication number
EP1094686B1
EP1094686B1 EP00402728A EP00402728A EP1094686B1 EP 1094686 B1 EP1094686 B1 EP 1094686B1 EP 00402728 A EP00402728 A EP 00402728A EP 00402728 A EP00402728 A EP 00402728A EP 1094686 B1 EP1094686 B1 EP 1094686B1
Authority
EP
European Patent Office
Prior art keywords
coil
fact
speaker
magnet
loud
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
EP00402728A
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English (en)
French (fr)
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EP1094686A1 (de
Inventor
Marc M. Anciant
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.)
Sagem SA
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Sagem SA
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Filing date
Publication date
Application filed by Sagem SA filed Critical Sagem SA
Publication of EP1094686A1 publication Critical patent/EP1094686A1/de
Application granted granted Critical
Publication of EP1094686B1 publication Critical patent/EP1094686B1/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
    • 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 present invention relates to a permanent magnet actuator and electric excitation coil, in particular a telephone speaker mobile or a personal computer speaker. She has for purpose of making the movement of such an actuator insensitive to external electromagnetic disturbances.
  • Such loudspeakers are known in particular from documents US-A-5 937,076, WO 94 16536 A and CH-A-245 420.
  • the electrical signal corresponding to this recognition as well as all the signals exchanged are contained in time windows of 577 microseconds in frames of eight windows with a duration of 4.615 milliseconds (in GSM TDMA mode - Time Division Multiple Access.
  • the mobile phone output amplifier is therefore the seat of a impulse consumption with a frequency of the order of 217 Hz.
  • This high consumption generates an electromagnetic noise which propagates in the case of the mobile phone and which in some cases leads parasitic mechanical excitation of the speaker membrane of the mobile phone.
  • the user then hears a cavalcade noise, at least at the time of recognition. This noise is annoying.
  • the disturbance observed is not a disturbance of the audio signal which powers the loudspeaker (even if this source also intervenes), but one current induction in the speaker coil, which has the effect of set in motion the coil and the diaphragm of the loudspeaker and therefore produce noise.
  • This noise is called burst noise with reference to the envelopes of the powers consumed in the time windows. So when we short-circuit the speaker on itself, without any contact electric with the printed circuit, we perceive the burst noise of the same way.
  • the problem is less critical because the speaker is relatively far from the circuit board on the board electronic. Since it is difficult to predict the structure of the field magnetic radiated by an electronic card, this kind of problem is not detectable only when the speaker is integrated into the mobile, even if we know that it is always better to keep the speaker as far away as possible high power radio tracks.
  • a voltage U (t) is applied to the terminals of the loudspeaker.
  • the latter's excitation coil is then traversed by a current i.
  • This coil is also bathed in a static static magnetic field B 0 created by a loudspeaker magnet.
  • This force is sometimes positive sometimes negative depending on the direction of current flow in the coil.
  • the coil being integral with the speaker membrane, the coil plus membrane assembly is thus set in motion.
  • the object of the invention is to remedy the disadvantage cited by combating evil with evil.
  • a voltage + e appears across the coil when it is immersed in the disturbing field B e (t).
  • a second coil identical to the first and close to the latter, a voltage + e will appear in the same way across its terminals. It then remains to be connected in series, but in opposition (that is to say with reverse winding directions), the two coils, so that the two voltages cancel each other out. If due to the disturbance B e (t) no voltage is applied to the terminals of the two coils, then no corresponding current flows there. If no current flows there, then no mechanical force is exerted on the coil and therefore the diaphragm of the loudspeaker does not move due to the disturbance.
  • the subject of the invention is therefore an actuator of a mobile telephone speaker comprising a magnet permanent, an actuated part and a first electric excitation coil mechanical, movable relative to the magnet and fixed to the actuated part, characterized in that it comprises a second electric coil, wound in series with the first coil but so as to produce a counter-electromotive force reverse of that produced by the first coil when they are both subject to the same electromagnetic field or temporally variable magnetic.
  • FIG. 1 shows an actuator according to the invention.
  • This actuator in the example shown can be used to make a speaker, in particular a mobile phone speaker.
  • This actuator comprises a permanent magnet 1, a first coil 2, and an actuated part 3, here a membrane 3 of a loudspeaker.
  • the membrane 3 is fixed to the coil 2, in particular by bonding a central ring of this membrane 3 to an upper edge of this coil 2.
  • This coil 2 is placed around a central drum 4 of the magnet 1.
  • the coil 2, and the membrane 3 are movable relative to the central drum 4, in a direction perpendicular to a radial field B 0 prevailing in an air gap 5 of the magnet 1.
  • the actuator of the invention is mainly characterized by the presence of a second coil 6 connected in series with the coil 2 in such a way that it produces a reverse electromotive force opposite to that produced by the first coil 2 when they are both subjected to the same electromagnetic or magnetic field which is temporally variable.
  • the two coils 2 and 6 each have between 40 and 50 turns.
  • the temporally variable electromagnetic field is a disturbing field B e (t). It is for example that produced by conductive tracks etched on a printed circuit of an electronic card placed nearby, or even which carries the actuator. This disturbing field can for example be oriented perpendicular to the field B 0 .
  • the first and second coils are coaxial. This preferred mode is not, however, a necessity.
  • the two coils 2 and 6 in series are subjected to a voltage U (t) of a useful signal which states that the actuator wants to follow.
  • the connection reversal is provided so that the current flowing in the two coils has a different direction of rotation in one than that it has in the other. If the two coils are integral with one another and are immersed in the motor field B 0 , the mechanical forces exerted on the coils can then oppose and the membrane or the lever 3 will not be set in motion under the effect of the voltage U (t). There are then several solutions to produce a movement. Either the coils will be separated from one another ( Figures 1 and 2), or they will be fixed to each other ( Figures 3a and 3b). When they are separated, only one of them is driving to drive the membrane 3. When they are integral, the magnet is arranged.
  • the second coil 6 is released from the motor field B 0 .
  • the coil 6 is glued against the base 7 of the magnet 1. Only the coil 2 is driving because in the magnet 1 the field passes essentially through the air gap 5. It loops back into the base 8 of the magnet 1.
  • the disturbing field tends to cause a current to flow in the opposite direction in these two coils, which is not possible given their mode of connection. Consequently, no disturbing current is installed which would be due to such a disturbing field, and the membrane 3 is only subjected to useful movements reproducing the voltage U (t).
  • the efficiency of the system risks however being put in default. Indeed, so that the compensation with respect to the disturbing field is perfect, it is preferable that the two coils 2 and 6 bathe in a disruptive magnetic field in the same way. This is not quite the case because the coils 2 and 6 are distant from each other. It is possible by example that interference field leaks pass between the two coils, in the base 8.
  • a second solution allows the opposite to let bathe a second coil 9 in the field B 0 , and especially in a disturbing field identical to the disturbing field perceived by the coil 2. Therefore the compensation is perfect.
  • the second coil 9 is fitted into the first coil 2. So that it is: mechanically dissociated from the coil 2, the coil 9 is preferably glued around the barrel 4 of the magnet 1 (or against the soda 8) to prevent movement.
  • the two coils are separated and only the first coil plays a driving role.
  • a double magnet 10 is used.
  • This double magnet 10 comprises a lower part 11 of the type of that of the magnet 1, and a complementary part 12 (shown seen from above in FIG. 3b).
  • Part 12 comprises a central barrel linked by a console 15 for field feedback to a peripheral crown.
  • the console 15 is not very thick and lets the voice coil fluctuate normally.
  • the two parts 11 and 12 have, when they are stacked and glued to each other, an adjoining air gap of common size where the coils float.
  • the direction of the driving field B 0 in the air gap 5 of the part 11 is in the opposite direction to the direction of the field B 0 'in the air gap 13 of the complementary part.
  • the field in the upper part 12 is divergent radial and, in the lower part 11, the field is radial convergent, or vice versa.
  • the two coils then have a combined motor role for currents which flow through them with opposite directions of rotation.
  • the turns of the second coil 14, when they enter the air gap of the upper part 12 cause a contrary force on the membrane. This is not a problem since the current in the active strands is sufficient to continue moving the membrane 3.
  • a space without conductive strand is provided between the two coils. The height of this space corresponds to the expected travel of the coils under the effect of the voltage U (t).
  • This solution also has the advantage that the industrial production of the overall coil 2-14 and that its mounting in the actuator are identical to those of the prior art.
  • FIG 4 shows in detail the realization of a speaker with the variant of Figure 2.
  • a winding 9 around a drum 4 of a permanent magnet.
  • This winding is carried out in at least two layers so that two conductive strands 16 and 17 of this winding lead, preferably in pairs, to a first end 18 of the coil 9.
  • a sliding wall 19 is placed around the coil 9, for example in the form of a polytetrafluoroethylene sleeve, or need by covering the external part of the coil 9 with a layer of paraffin.
  • An outer periphery of this membrane 3 is fixed to a peripheral structure 20.
  • the winding of the coil 2 is also carried out in at least two layers so that two conductive strands 21 and 22 of this winding lead, preferably in torque, to a second end 23 of the coil.
  • the strands 21 and 22 are glued against the back of the membrane 3.
  • the barrel 4 and the coil 9 are then introduced into the coil 2 so that that the ends 18 and 23 are opposite to each other.
  • Sections 16 and 17 are then folded around the reel 2, but with enough play, before they too are glued, at least in part, against the back of the membrane 3, at a place where the connection of the strand 17 to the strand 21 is possible. All will then be supplied between strands 16 and 22.
  • the assembly is finally mounted by hanging the structure 20 on the peripheral right foot of the magnet 1. At this moment, the barrel 4 is glued against the base 8 of the magnet.
  • the second coil that which is not subjected to the radial field, is integral with the membrane, for example at the outer periphery thereof, where this membrane is held on the speaker.
  • the coil of compensation is precisely carried out on the outer periphery of this membrane, glued against it or against the peripheral structure 20, where it is attached to the menbran. It then becomes easily possible to provide additional switching in conjunction with these points connecting strands on the membrane. Preferably, these points of connection are placed near this outer periphery of this membrane.
  • the internal impedance of the amplifier can be modified accordingly coil supply.
  • the second coil 6 or the second coil 9 will be made with larger conductive strands diameters. Their electrical resistance will be reduced accordingly. On the plan engine no inertia problem is to be feared because in these variants the second coils 6 and 9 are fixed.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Telephone Set Structure (AREA)

Claims (9)

  1. Mobiltelefon-Lautsprecher mit einem Dauermagneten (1), einer Membran (3), einer ersten elektrischen Spule (2) mit mechanischer Erregung, die in bezug auf den Magneten beweglich und an der Membran befestigt ist, und einer zweiten elektrischen Spule (6; 9), dadurch gekennzeichnet, daß die zweite Spule (6; 9) mit der ersten Spule (2) derart in Reihe gewickelt ist, daß sie eine gegenelektromotorische Kraft erzeugt, die derjenigen entgegengerichtet ist, die von der ersten Spule erzeugt wird, wenn sie beide dem gleichen zeitlich veränderlichen elektromagnetischen oder magnetischen Feld unterworfen sind, und daß die zweite Spule (6; 9) in bezug auf den Magneten ortsfest gehalten wird.
  2. Lautsprecher nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Spule (6; 9) innerhalb des Felds des Magneten angeordnet ist.
  3. Lautsprecher nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß die zweite Spule (6; 9) durch eine Gleitwand (19) mechanisch von der ersten Spule getrennt ist.
  4. Lautsprecher nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß die zweite Spule (6; 9) außerhalb des Felds des Magneten angeordnet ist.
  5. Lautsprecher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die zweite Spule (9) in die erste Spule (2) eingefügt ist, daß die erste und die zweite Spule je ein Paar von Versorgungsadern aufweisen, die nebeneinander münden, wobei das Adernpaar der ersten Spule an einem Ende dieser Spule entgegengesetzt zum Ende der zweiten Spule mündet, wo das Adernpaar dieser zweiten Spule mündet.
  6. Lautsprecher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Enden der Litzen der beiden Spulen auf die Membran geklebt sind.
  7. Lautsprecher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Enden der Litzen der beiden Spulen auf den Rücken der Membran geklebt sind.
  8. Lautsprecher nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die zweite Spule am Außenumfang der Membran befestigt ist.
  9. Mobiltelefon-Lautsprecher mit einem Dauermagneten (1), einer Membran (3), einer ersten elektrischen Spule (2) mit mechanischer Erregung, die in bezug auf den Magneten beweglich und an der Membran befestigt ist, und einer zweiten elektrischen Spule (6; 14), dadurch gekennzeichnet, daß die zweite Spule (14) mit der ersten Spule (2) derart in Reihe gewickelt ist, daß sieeine gegenelektromotorische Kraft erzeugt, die derjenigen entgegengerichtet ist, die von der ersten Spule erzeugt wird, wenn sie beide dem gleichen zeitlich veränderlichen elektromagnetischen oder magnetischen Feld unterworfen sind, daß die zweite Spule (14) in bezug auf die erste Spule (2) ortsfest gehalten wird, und daß die beiden Spulen innerhalb des Felds des Magneten gegenüber einer Magnetspaltzone dieses Magneten angeordnet sind, in der das Feld eine Ausrichtungsumkehr erfährt, je nachdem, ob es durch die erste oder die zweite Spule verläuft.
EP00402728A 1999-10-19 2000-10-04 Lautsprecher für mobile Telefon Expired - Lifetime EP1094686B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9912996A FR2799919B1 (fr) 1999-10-19 1999-10-19 Actionneur a aimant permanent et bobine electrique d'excitation, notamment haut-parleur de telephone mobile
FR9912996 1999-10-19

Publications (2)

Publication Number Publication Date
EP1094686A1 EP1094686A1 (de) 2001-04-25
EP1094686B1 true EP1094686B1 (de) 2003-05-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00402728A Expired - Lifetime EP1094686B1 (de) 1999-10-19 2000-10-04 Lautsprecher für mobile Telefon

Country Status (5)

Country Link
US (2) US6901150B1 (de)
EP (1) EP1094686B1 (de)
DE (1) DE60002649T2 (de)
ES (1) ES2193925T3 (de)
FR (1) FR2799919B1 (de)

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FI20011303A (fi) * 2001-06-19 2002-12-20 Nokia Corp Kaiutin
US7940950B2 (en) * 2005-10-03 2011-05-10 Youngtack Shim Electromagnetically-shielded speaker systems and methods
US7876917B2 (en) * 2006-08-28 2011-01-25 Youngtack Shim Generic electromagnetically-countered systems and methods
CN102413672B (zh) * 2006-05-25 2016-11-16 沈瑛泽 通用反电磁系统和方法
US8041048B2 (en) * 2008-12-31 2011-10-18 Youngtack Shim Electromagnetically-countered speaker systems and methods
US9112395B2 (en) 2006-08-28 2015-08-18 Youngtack Shim Electromagnetically-countered actuator systems and methods
US8035990B2 (en) * 2008-12-31 2011-10-11 Youngtack Shim Electromagnetically-countered display systems and methods
US8625306B2 (en) 2006-08-28 2014-01-07 Youngtack Shim Electromagnetically-countered display systems and methods
US8809753B2 (en) * 2006-08-28 2014-08-19 Youngtack Shim Electromagnetically-countered microwave heating systems and methods
US20110095935A1 (en) * 2006-08-28 2011-04-28 Youngtack Shim Electromagnetically-countered systems and methods by maxwell equations
DE102007007800B3 (de) * 2007-02-16 2008-08-28 Siemens Audiologische Technik Gmbh Hörvorrichtung mit Hörerkompensationsspule
US20100163298A1 (en) * 2008-12-31 2010-07-01 Youngtack Shim Electromagnetically-countered power grid systems and methods
FR2961053B1 (fr) * 2010-06-04 2013-04-12 Focal Jmlab Haut-parleur acoustique
US8319088B1 (en) * 2010-10-18 2012-11-27 Nessy Harari Poly-coil matrix
CN105554656B (zh) * 2016-02-29 2019-05-07 歌尔股份有限公司 动圈式扬声器结构和音频播放装置
CN113727262B (zh) * 2021-08-27 2023-05-23 山东省人工智能研究院 基于匹配扰动补偿的音圈驱动器力输出式位移控制方法
CN115226010B (zh) * 2022-09-07 2023-02-17 荣耀终端有限公司 一种抗磁干扰结构及电子设备

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Also Published As

Publication number Publication date
EP1094686A1 (de) 2001-04-25
ES2193925T3 (es) 2003-11-16
DE60002649D1 (de) 2003-06-18
FR2799919A1 (fr) 2001-04-20
FR2799919B1 (fr) 2002-10-11
DE60002649T2 (de) 2004-04-01
US6901150B1 (en) 2005-05-31
US20040208337A1 (en) 2004-10-21

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