EP2577989B1 - Akustischer lautsprecher - Google Patents

Akustischer lautsprecher Download PDF

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Publication number
EP2577989B1
EP2577989B1 EP11730722.3A EP11730722A EP2577989B1 EP 2577989 B1 EP2577989 B1 EP 2577989B1 EP 11730722 A EP11730722 A EP 11730722A EP 2577989 B1 EP2577989 B1 EP 2577989B1
Authority
EP
European Patent Office
Prior art keywords
coil
loudspeaker
winding
magnetic field
acoustic
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.)
Active
Application number
EP11730722.3A
Other languages
English (en)
French (fr)
Other versions
EP2577989A1 (de
Inventor
Arnaud Cazes Bouchet
Daniel Emonts
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.)
Focal JMLab SAS
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Focal JMLab SAS
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Publication date
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Publication of EP2577989A1 publication Critical patent/EP2577989A1/de
Application granted granted Critical
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/043—Short circuited voice coils driven by induction
    • 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

Definitions

  • the invention relates to the field of acoustic loudspeakers. It is more particularly a loudspeaker equipped with arrangements allowing it to provide adjustment in the field of low frequencies, and more specifically bass sounds.
  • the reproduction of bass sounds is a major element in the assessment of the quality of an audio system.
  • the quality of listening depends on one hand on the ability of an amplifier to reproduce these serious sounds, but on the other hand, performances of the speaker which themselves are, as far as the bass is concerned, dependent on the room in which the loudspeaker is located.
  • the size and geometry of the room can have an influence, to the extent that, at the frequencies considered in the bass, the amount of air displaced by the speaker diaphragm is important.
  • the wavelengths are such that the phenomena of reflection can cause the appearance of knots and wavelets that, depending on the location of the user, the sound quality can be very variable.
  • a particular speaker has been described in the document DE 195 28 904 .
  • This speaker has a second coil mounted on the moving element, and in the magnetic field of the magnet of the speaker. This coil is short-circuited, and protects the speaker against over-currents and excessive vibrations.
  • the problem to be solved by the invention is therefore to allow adjustment in the low frequency band, without causing significant changes to the surrounding frequencies, without requiring complex or expensive installation.
  • this loudspeaker is characterized in that the two terminals of the second winding are connected by a substantially resistive component, selected from a set of resistive elements of distinct resistance values, by means of ensuring the connecting one of these elements to the terminals of the second winding.
  • a substantially resistive component selected from a set of resistive elements of distinct resistance values, by means of ensuring the connecting one of these elements to the terminals of the second winding.
  • These means may be particularly varied, and it may for example be a set of jumpers or even multi-position buttons that connect the most appropriate resistance.
  • the loudspeaker is equipped with a coil in short circuit or closed circuit on a resistor, which moves in the magnetic field as the main coil, and which is therefore the seat of induced currents that dissipate by effect Joule in the resistive element connected to its terminals.
  • the damping factor (or Qms) of the loudspeaker is adjusted so as to ensure optimum coupling between the volume of the listening room and the loudspeaker volume.
  • the complementary winding which is in practice associated with the main winding in which the control current flows, is the seat of a counter electromotive force which tends to prevent the coil from moving in the gap.
  • the second coil has a volume of conductive material substantially identical to that of the main coil.
  • substantially equal volumes it is meant that the difference between the two volumes is less than 20% relative to the smallest volume. Nevertheless, the phenomenon of damping can intervene for complementary windings which present a volume clearly different from that of the main volume, according to which one wishes to privilege the inertia of the mobile equipment, or conversely the degree of amortization.
  • the son of the damping coil may be made of copper, that is to say in the same material as that of the main winding, or in another material such as aluminum or the like.
  • a compromise can be found between weight gain through the use of a less dense conductor such as aluminum, and the resistance value of the conductor, depending on its resistivity and section.
  • a loudspeaker 1 comprises, in the traditional way, a mobile unit composed of a membrane 2 to which is associated a winding 3 connected to the amplifier 10 delivering the electrical signal representative of the acoustic wave to be generated.
  • This coil 3 moves inside an area in which a constant magnetic field is generated, created by a field source which is generally a magnetized element 6, associated with pole pieces 7, 8, 9, so as to confining the field lines at winding 3 with a minimum air gap.
  • a field source which is generally a magnetized element 6, associated with pole pieces 7, 8, 9, so as to confining the field lines at winding 3 with a minimum air gap.
  • the loudspeaker comprises a second winding which, in the form shown, is covering the main winding, so as to be subjected to the same magnetic field.
  • the main winding 3 is formed by a winding son, typically copper, of round section, while the coil 20 for changing the damping factor is formed by a wire rectangular section.
  • a winding son typically copper
  • the coil 20 for changing the damping factor is formed by a wire rectangular section.
  • This arrangement makes it possible not to excessively increase the air gap while maintaining a winding resistance as low as possible and a sufficient volume of copper.
  • the principle of the invention also works with the use of other types of son, for example having cylindrical section, or made of similar materials such as aluminum.
  • the damping winding 20 can be connected to different resistive elements 21-23.
  • One of these elements can be a resistive element of very low value to simulate a short circuit to obtain maximum damping. It can also be a resistive element of average value which limits the current and is located on an intermediate value of the mechanical overvoltage coefficient (Qms). This value is calculated on a case-by-case basis, in order to obtain an intermediate level overvoltage coefficient value. In final, this adjustment is made in the listening room, according to the user's perceptions and the level of reverberation of this place. It can also be done in the factory, as long as the geometrical parameters of the room where the loudspeaker will be installed are known.
  • the number of connectable resistive elements may vary depending on the fineness of the adjustment that is desired. It is also possible for the damping coil 20 to be left in the air so as not to create an electromagnetic force, in which case the damping coil does not create an electromotive force so that the loudspeaker operates with these parameters.
  • this adjustment can be done in different ways without departing from the principle of the invention, whether it is riders 24 as shown in FIG. figure 3 , or a multi-position knob for connecting the appropriate resistor 21,22,23 .
  • FIG. 4 An exemplary embodiment is illustrated in the figure 4 , in which the impedance of the loudspeaker, seen by the amplifier, is plotted on the ordinate, and the frequency on the abscissa, giving priority to the bass zone.
  • the curve 41 which has the most marked peaks corresponds to an open circuit situation, an almost infinite resistance.
  • the two peaks 42, 43 located in the neighborhood of 15 and 50 Hertz correspond to couplings between the loudspeaker and the vent as a function of the volume of the loudspeaker and the Thiele and Small parameters of the loudspeaker.
  • Curve 45 corresponds to the intermediate current flow position in a 2.2 Ohms resistor which makes it possible to reduce the sound level between 50 and 100 Hz by -1.5 dB, the factor Qms being divided by 8.
  • the loudspeaker according to the invention has the advantage of being able to be adjusted so as to adjust its mechanical quality factor which has a very high resolution, including in the low register, and this with an easy-to-implement solution that makes it applicable to a wide range of speakers.
  • the invention makes it possible to adjust the response of the acoustic enclosure to the listening room.

Landscapes

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

Claims (3)

  1. Akustischer Lautsprecher (1), Folgendes aufweisend:
    - eine Magnetfeldquelle (6);
    - eine bewegliche Einrichtung mit einer Membran (2), einer Wicklung (3), die geeignet ist, von einem elektrischen Strom durchflossen zu werden, der für das zu erzeugende Schallsignal repräsentativ ist, und mit dem Magnetfeld zu interagieren, und einer zweiten Wicklung (20),
    dadurch gekennzeichnet, dass er eine Einheit von im Wesentlichen resistiven Elementen (21, 22, 23) mit verschiedenen Widerstandswerten und Mittel (24) aufweist, um den Anschluss eines der genannten Elemente an die Anschlüsse (27, 28) der zweiten Wicklung (20) sicherzustellen.
  2. Lautsprecher nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Wicklung (20) aus einem Draht mit rechteckigem Querschnitt hergestellt ist.
  3. Lautsprecher nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Wicklung (20) ein Volumen aus leitendem Material aufweist, das im Wesentlichen gleich demjenigen der Wicklung (3) ist, die von dem für das Signal repräsentativen Strom durchflossen wird.
EP11730722.3A 2010-06-04 2011-06-03 Akustischer lautsprecher Active EP2577989B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1054386A FR2961053B1 (fr) 2010-06-04 2010-06-04 Haut-parleur acoustique
PCT/FR2011/000330 WO2011151546A1 (fr) 2010-06-04 2011-06-03 Haut-parleur acoustique

Publications (2)

Publication Number Publication Date
EP2577989A1 EP2577989A1 (de) 2013-04-10
EP2577989B1 true EP2577989B1 (de) 2014-03-26

Family

ID=43297165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11730722.3A Active EP2577989B1 (de) 2010-06-04 2011-06-03 Akustischer lautsprecher

Country Status (4)

Country Link
US (1) US8917898B2 (de)
EP (1) EP2577989B1 (de)
FR (1) FR2961053B1 (de)
WO (1) WO2011151546A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022147835A (ja) * 2021-03-23 2022-10-06 ヤマハ株式会社 音響／信号変換器

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1935404A (en) * 1931-01-14 1933-11-14 Telefunken Gmbh Oscillating coil for electrodynamic loudspeakers
US3766334A (en) * 1971-11-15 1973-10-16 A Burke Double voice coil loudspeaker
US3838216A (en) * 1972-02-23 1974-09-24 W Watkins Device to effectively eliminate the motion induced back emf in a loudspeaker system in the region of fundamental acoustic resonance
GB1600689A (en) * 1977-03-01 1981-10-21 Seas Fabrikker As Loudspeaker
JPS5476132A (en) * 1977-11-30 1979-06-18 Hitachi Ltd Electro-dynamic type speaker
US4243839A (en) * 1977-12-14 1981-01-06 Matsushita Electric Industrial Co., Ltd. Transducer with flux sensing coils
US4335274A (en) * 1980-01-11 1982-06-15 Ayers Richard A Sound reproduction system
JPS5936689U (ja) * 1982-08-31 1984-03-07 パイオニア株式会社 スピ−カ装置
DE19528904C1 (de) * 1995-08-05 1997-04-10 Michael Weidlich Wandler zur Umwandlung von Wechselströmen in mechanische Bewegungen einer elastisch aufgehängten Masse
US5828767A (en) * 1997-09-22 1998-10-27 Jbl Inc. Inductive braking in a dual coil speaker driver unit
WO1999052325A1 (fr) * 1998-04-03 1999-10-14 Sony Corporation Haut-parleur
JP4122602B2 (ja) * 1998-11-19 2008-07-23 ソニー株式会社 スピーカー装置
JP2000333293A (ja) * 1999-05-19 2000-11-30 Sony Corp スピーカ
FR2799919B1 (fr) * 1999-10-19 2002-10-11 Sagem Actionneur a aimant permanent et bobine electrique d'excitation, notamment haut-parleur de telephone mobile
ATE414394T1 (de) * 2002-01-25 2008-11-15 Sonion Horsens As Flexible membran mit integrierter spule
US20050031151A1 (en) * 2003-04-30 2005-02-10 Louis Melillo Speaker with adjustable voice coil impedance
US7492918B2 (en) * 2004-08-17 2009-02-17 Step Technologies Inc. Audio speaker with graduated voice coil windings
US20060188120A1 (en) * 2005-02-23 2006-08-24 Michael Fisher Multiple active coil speaker
US7940950B2 (en) * 2005-10-03 2011-05-10 Youngtack Shim Electromagnetically-shielded speaker systems and methods
US20070183620A1 (en) * 2006-02-07 2007-08-09 Stiles Enrique M Selectable impedance, constant efficiency electromagnetic transducer
US8761433B2 (en) * 2006-06-12 2014-06-24 Harman International Industries, Incorporated Variable impedance voice coil loudspeaker

Also Published As

Publication number Publication date
US20130148841A1 (en) 2013-06-13
FR2961053B1 (fr) 2013-04-12
WO2011151546A1 (fr) 2011-12-08
US8917898B2 (en) 2014-12-23
EP2577989A1 (de) 2013-04-10
FR2961053A1 (fr) 2011-12-09

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