EP1094686A1 - Haut-parleur de téléphone mobile - Google Patents
Haut-parleur de téléphone mobile Download PDFInfo
- Publication number
- EP1094686A1 EP1094686A1 EP00402728A EP00402728A EP1094686A1 EP 1094686 A1 EP1094686 A1 EP 1094686A1 EP 00402728 A EP00402728 A EP 00402728A EP 00402728 A EP00402728 A EP 00402728A EP 1094686 A1 EP1094686 A1 EP 1094686A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- magnet
- membrane
- field
- loudspeaker according
- 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
Links
- 239000012528 membrane Substances 0.000 claims description 28
- 230000005284 excitation Effects 0.000 claims description 6
- 230000005672 electromagnetic field Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 abstract description 14
- 230000033001 locomotion Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Images
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 subject of the present invention is a permanent magnet actuator and electric excitation coil, including a mobile phone speaker or a personal computer speaker. Its purpose is to make the movement of such an actuator insensitive to disturbances external electromagnetic.
- the electrical signal corresponding to this protocol recognition just as all the exchanged signals are contained in windows time of 577 microseconds in frames of eight windows including the duration is 4.615 milliseconds (in GSM TDMA mode - Time Division Multiple Access - Multiple access over time.
- the amplifier mobile phone output is therefore the seat of a consumption pulse with a frequency of the order of 217 Hz.
- This consumption strong generates an electromagnetic noise which propagates in the case of the mobile phone and which in some cases leads to mechanical excitation noise from the speaker membrane of the mobile phone.
- the user then hears a cavalcade noise, at least at the time of the recognition. This noise is annoying.
- the disturbance observed is not a disturbance of the audio signal which powers the speaker (even if this source is also involved), but a 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 you 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 magnet of the loudspeaker.
- This force is sometimes positive sometimes negative depending on the direction of current flow in the coil.
- the coil being integral with the speaker diaphragm, the coil plus diaphragm assembly is thus set in motion.
- the object of the invention is to remedy the drawback 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 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 barrel 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 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 whose states we want the actuator 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 may however be 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.
- the coil 9 is preferably glued around the barrel 4 of the magnet 1 (or against the base 8) to prevent its movement. There too, 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 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 an opposite 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 barrel 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 plies 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 reel 2, but with enough play, before they are also 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)
Abstract
Description
- Figures 1 à 3b : trois variantes d'un actionneur selon l'invention, appliquées à la réalisation d'un haut-parleur, notamment un haut-parleur de téléphone mobile ;
- Figure 4 : des détails de réalisation de la deuxième variante préférée de l'invention.
Claims (9)
- Haut-parleur de téléphone mobile comportant un aimant permanent, une membrane, une première bobine électrique d'excitation mécanique, mobile par rapport à l'aimant et fixée à la membrane, caractérisé en ce qu'il comporte une deuxième bobine électrique bobinée de manière à produire une force contre-électromotrice inverse de celle produite par la première bobine quand elles sont soumises toutes deux à un même champ électromagnétique ou magnétique temporellement variable, les extrémités des brins des deux bobines étant collées sur la membrane.
- Haut-parleur selon la revendication 1, caractérisé en ce que la deuxième bobine est placée à l'intérieur du champ de l'aimant, est mobile avec la première bobine et en ce que l'aimant possède un entrefer dans lequel le champ subit une inversion d'orientation.
- Haut-parleur selon la revendication 1, caractérisé en ce que la deuxième bobine est séparée mécaniquement de la première bobine par une paroi de coulissement.
- Haut-parleur selon l'une des revendications 1 à 2, caractérisé en ce que la deuxième bobine est placée à l'extérieur du champ de l'aimant.
- Haut-parleur selon l'une des revendications 1 à 3, caractérisé en ce que la deuxième bobine est placée à l'intérieur du champ de l'aimant.
- Haut-parleur selon l'une des revendications 1 à 5, caractérisé en ce que la deuxième bobine est emboítée dans la première bobine, en ce que la première et la deuxième bobine comportent chacune un couple de brins d'alimentation débouchant côte à côte, le couple de brins de la première bobine débouchant à une extrémité de celle-ci opposée à l'extrémité de la deuxième bobine d'où débouche le couple de brins de cette deuxième bobine.
- Haut-parleur selon l'une des revendications 1 à 6, caractérisé en ce que la deuxième bobine est maintenue fixe par rapport à l'aimant.
- Haut-parleur selon l'une des revendications 1 à 6, caractérisé en ce que les extrémités des brins des deux bobines sont collées sur le dos de la membrane.
- Haut-parleur selon l'une des revendications 1 à 8, caractérisé en ce que la deuxième bobine est fixée à la périphérie extérieure de la membrane.
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 true EP1094686A1 (fr) | 2001-04-25 |
EP1094686B1 EP1094686B1 (fr) | 2003-05-14 |
Family
ID=9551077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00402728A Expired - Lifetime EP1094686B1 (fr) | 1999-10-19 | 2000-10-04 | Haut-parleur de téléphone mobile |
Country Status (5)
Country | Link |
---|---|
US (2) | US6901150B1 (fr) |
EP (1) | EP1094686B1 (fr) |
DE (1) | DE60002649T2 (fr) |
ES (1) | ES2193925T3 (fr) |
FR (1) | FR2799919B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102413672B (zh) * | 2006-05-25 | 2016-11-16 | 沈瑛泽 | 通用反电磁系统和方法 |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US20110095935A1 (en) * | 2006-08-28 | 2011-04-28 | Youngtack Shim | Electromagnetically-countered systems and methods by maxwell equations |
US8035990B2 (en) * | 2008-12-31 | 2011-10-11 | 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 |
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 |
US8625306B2 (en) | 2006-08-28 | 2014-01-07 | Youngtack Shim | Electromagnetically-countered display systems and methods |
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 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04299700A (ja) * | 1991-03-28 | 1992-10-22 | Matsushita Electric Ind Co Ltd | スピーカ |
WO1994016536A1 (fr) * | 1993-01-06 | 1994-07-21 | Velodyne Acoustics, Inc. | Haut-parleur renfermant une double bobine |
US5937076A (en) * | 1995-04-06 | 1999-08-10 | Alpine Electronics, Inc. | Magnetic drive apparatus and method for manufacturing coil that forms the apparatus |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
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CH245420A (fr) * | 1942-02-05 | 1946-11-15 | Cesati Mario | Haut-parleur électrodynamique. |
US2727949A (en) * | 1951-09-22 | 1955-12-20 | Julius B Lokkesmoe | Loudspeaker |
JPS542647Y2 (fr) * | 1971-03-10 | 1979-02-05 | ||
US4132861A (en) * | 1977-07-27 | 1979-01-02 | Gentex Corporation | Headset having double-coil earphone |
US4243839A (en) * | 1977-12-14 | 1981-01-06 | Matsushita Electric Industrial Co., Ltd. | Transducer with flux sensing coils |
JPS5931111Y2 (ja) | 1980-07-19 | 1984-09-04 | パイオニア株式会社 | ダイナミツクマイクロホン |
US4529846A (en) * | 1984-08-22 | 1985-07-16 | Northern Telecom Limited | Dynamic telephone receiver with magnetic shunt |
JP2612498B2 (ja) | 1989-08-03 | 1997-05-21 | 株式会社 巴川製紙所 | 樹脂封止型半導体装置用接着テ−プ |
JP3003397B2 (ja) * | 1992-06-26 | 2000-01-24 | オンキヨー株式会社 | スピーカ用磁気回路 |
GB2269500B (en) * | 1992-07-02 | 1996-02-07 | Motorola Israel Ltd | Radio communications device |
JP2940588B2 (ja) * | 1993-04-19 | 1999-08-25 | 株式会社ケンウッド | ボイスコイルの構造 |
DE4437476A1 (de) * | 1994-10-20 | 1996-05-02 | Nokia Deutschland Gmbh | Verbindungsleitung |
US5757945A (en) * | 1995-04-12 | 1998-05-26 | Kabushiki Kaisha Kenwood | Terminal for speaker |
US6158109A (en) * | 1996-03-20 | 2000-12-12 | Alpine Electronics, Inc. | Coil manufacturing method using ring shaped spacer |
JPH10285690A (ja) * | 1997-04-01 | 1998-10-23 | Sony Corp | 音響変換器 |
JP4269518B2 (ja) * | 1998-06-29 | 2009-05-27 | パナソニック株式会社 | 電気−機械−音響変換器及びこれを用いた電気−機械−音響変換装置 |
JP4122602B2 (ja) * | 1998-11-19 | 2008-07-23 | ソニー株式会社 | スピーカー装置 |
JP2000341789A (ja) * | 1999-05-26 | 2000-12-08 | Sony Corp | スピーカ |
KR100336296B1 (ko) * | 1999-07-30 | 2002-05-13 | 장세열 | 듀얼 음원 구조를 갖는 전기-음향 변환기 |
-
1999
- 1999-10-19 FR FR9912996A patent/FR2799919B1/fr not_active Expired - Fee Related
-
2000
- 2000-10-04 ES ES00402728T patent/ES2193925T3/es not_active Expired - Lifetime
- 2000-10-04 DE DE60002649T patent/DE60002649T2/de not_active Expired - Lifetime
- 2000-10-04 EP EP00402728A patent/EP1094686B1/fr not_active Expired - Lifetime
- 2000-10-18 US US09/691,684 patent/US6901150B1/en not_active Expired - Fee Related
-
2004
- 2004-05-11 US US10/842,774 patent/US20040208337A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04299700A (ja) * | 1991-03-28 | 1992-10-22 | Matsushita Electric Ind Co Ltd | スピーカ |
WO1994016536A1 (fr) * | 1993-01-06 | 1994-07-21 | Velodyne Acoustics, Inc. | Haut-parleur renfermant une double bobine |
US5937076A (en) * | 1995-04-06 | 1999-08-10 | Alpine Electronics, Inc. | Magnetic drive apparatus and method for manufacturing coil that forms the apparatus |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 017, no. 125 (E - 1332) 16 March 1993 (1993-03-16) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102413672B (zh) * | 2006-05-25 | 2016-11-16 | 沈瑛泽 | 通用反电磁系统和方法 |
Also Published As
Publication number | Publication date |
---|---|
FR2799919A1 (fr) | 2001-04-20 |
FR2799919B1 (fr) | 2002-10-11 |
ES2193925T3 (es) | 2003-11-16 |
DE60002649T2 (de) | 2004-04-01 |
US20040208337A1 (en) | 2004-10-21 |
DE60002649D1 (de) | 2003-06-18 |
US6901150B1 (en) | 2005-05-31 |
EP1094686B1 (fr) | 2003-05-14 |
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