EP0492142A2 - Système de commande pour un haut-parleur basse fréquence à excursion large - Google Patents

Système de commande pour un haut-parleur basse fréquence à excursion large Download PDF

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Publication number
EP0492142A2
EP0492142A2 EP91120015A EP91120015A EP0492142A2 EP 0492142 A2 EP0492142 A2 EP 0492142A2 EP 91120015 A EP91120015 A EP 91120015A EP 91120015 A EP91120015 A EP 91120015A EP 0492142 A2 EP0492142 A2 EP 0492142A2
Authority
EP
European Patent Office
Prior art keywords
coil
pole plate
voice coil
winding
permanent magnet
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
EP91120015A
Other languages
German (de)
English (en)
Other versions
EP0492142B1 (fr
EP0492142A3 (en
Inventor
Rüdiger Dipl.-Ing. Fleischer
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.)
Nokia Deutschland GmbH
Original Assignee
Nokia Deutschland 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 Nokia Deutschland GmbH filed Critical Nokia Deutschland GmbH
Publication of EP0492142A2 publication Critical patent/EP0492142A2/fr
Publication of EP0492142A3 publication Critical patent/EP0492142A3/de
Application granted granted Critical
Publication of EP0492142B1 publication Critical patent/EP0492142B1/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
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting
    • 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
    • H04R9/025—Magnetic circuit
    • 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
    • H04R2209/041—Voice coil arrangements comprising more than one voice coil unit on the same bobbin

Definitions

  • the invention relates to a drive system for long-throw woofers.
  • a long-stroke magnet system is understood to mean a magnet system in which the longitudinal extension of the voice coil on the voice coil former corresponds to at least 1.5 times the thickness of the upper pole plate.
  • a loudspeaker from the manufacturer SEAS in which a plurality of windings located at the upper and lower edge of the voice coil are short-circuited to one another by means of soldering. These short-circuit areas cause a current to be induced when they are immersed in the air gap between the upper pole plate and the pole core. The result is that the spool is braked and does not exceed its maximum permitted stroke even under peak loads.
  • this known arrangement prevents the coil from hitting the ground or the coil from being placed on the upper pole plate, this is a very complex measure for eliminating the disadvantage.
  • Another measure which prevents the voice coil bobbin from bumping against the bottom of the magnetic pot is known from Funkschau 1986, Issue 17, page 29.
  • another air gap the so-called brake air gap
  • the magnetic field prevailing in this brake air gap is opposed to the field in the air gap between the upper pole plate and the pole core, so that the coil is braked as soon as it is immersed in the brake air gap becomes.
  • a disadvantage of this known arrangement is that only the lifting movement of the voice coil bobbin directed inwards towards the bottom of the magnetic pot is braked. The limitation of the maximum permissible stroke for outward lifting movements can only be ensured with this arrangement by using appropriately hard fasteners.
  • the invention is therefore based on the object of specifying a drive system for long-throw woofers which avoids the disadvantages of the known arrangements and allows very softly designed fastening elements which therefore have a large range of linear spring tension, without there being the risk of the maximum permissible stroke travel at peak loads of the vibrating parts is exceeded.
  • This object is achieved in that a further coil arrangement is arranged on the outer jacket of the voice coil support and at a distance from the first coil, this coil arrangement - like the coil - is acted upon by the amplifier power, although the direction of current flow in the coil and coil arrangement is opposite.
  • the voice coil carrier is braked in its movement as soon as the coil arrangement is immersed in the air gap between the upper pole plate and the pole core.
  • the active braking ie using the amplifier power the voice coil former also causes that the braking effect is increased compared to the known arrangements.
  • the coil arrangement is divided into an upper and lower winding area and if all winding areas are at the same distance from the coil, the voice coil or the voice coil former can be braked in each of the two possible lifting directions. Because the winding width of the two winding areas is reduced compared to the winding width of the coil, the additional effort for the actively controlled brake of the voice coil former remains low.
  • the distance from the coil to the two winding areas is chosen so that during the operation of the system the winding area approaching the upper pole plate is already immersed in the air gap before the coil has left the air gap, it is ensured that the Braking effect is elastic.
  • the lower pole plate is circular, its thickness corresponds to the thickness of the upper pole plate, the pole core is dimensioned so long that it is encased by the lower pole plate at a distance and otherwise projects beyond the side of the lower pole plate facing away from the permanent magnet the free end of the voice coil bobbin has such a length that it projects beyond the surface of the lower pole plate facing away from the permanent magnet when the system is at rest with at least half the thickness of the lower pole plate, the coil arrangement is a further coil corresponding to the winding width of the coil and the coil arrangement is symmetrical to the lower pole plate at the location on the outer jacket of the voice coil former fixed, which is adjacent to the lower pole plate in the rest position of the system, this has the advantage that both coils (coil and coil arrangement) contribute to the drive of the membrane and only when one of the two coils plunges into the air gap of the other coil Braking effect sets in.
  • the distance between the coil and the coil arrangement and the height of the permanent magnet are matched to one another so that when the system is in operation, a part of both coils protrude into an air gap before the maximum deflection is reached, this causes the movement of the voice coil former to be braked elastically becomes.
  • the centering of the voice coil former is improved by a further centering membrane according to claim 6. If the pole core has a constriction in the region which is adjacent to the permanent magnet, this has the advantage that the bundling of the field lines in the region between the pole core and the pole plates is particularly good.
  • the region of the pole core which has the constriction is formed by a magnetically high-energy disk, preferably a neodymium disk and this disk has a magnetization opposite to that of the permanent magnet, this has the advantage that the induction in the air gaps is increased.
  • FIG. 1 shows a section through a long-stroke magnet system of a woofer 10.
  • the magnet pot 11 is formed by an upper, annularly shaped pole plate 12, a likewise annular permanent magnet 13 and a lower pole plate 14 and a pole core 15, in which the upper pole plate 12 with the side of the annular surface of the permanent magnet 13 facing the membrane 16 and the lower one Pole plate 14 is connected to the other annular surface of the permanent magnet 13 and the pole core 15 is inserted into the space 17 centrally to the loudspeaker center axis and is connected to the lower pole plate 14.
  • the side of the upper pole plate 12, which faces the membrane 16, is connected to the cone-shaped speaker basket 18.
  • the membrane 16 is inserted into the speaker basket 18.
  • the membrane 16 and the loudspeaker basket 18 are connected to one another at their ends, which each have the larger diameter, by means of a bead (not shown).
  • the tubular voice coil former 19 is attached to the end of the membrane 16, which has the smaller diameter.
  • the free end of the voice coil bobbin 19 protrudes into the space 17 with a partial covering of the pole core 15.
  • the coil 21 is arranged on the outer jacket 20 of the voice coil former 19.
  • the winding width of the coil 21 corresponds approximately to twice the thickness of the upper pole plate 12.
  • the operating state of the system illustrated in FIG. 1 corresponds to that of the rest position of the loudspeaker 10. For this reason, as FIG. 1 emphasizes, the coil 21 is also adjacent to the upper pole plate and projects beyond its thickness on both sides at the same distance.
  • the coil arrangement 22 is arranged on the outer jacket 20 of the voice coil former 19.
  • This coil arrangement 22 is formed by an upper winding area 23 and a lower winding area 24. Both winding areas 23, 24 are at the same distance from the coil 21.
  • the two winding areas 23, 24 are connected in series with the coil 21, but the winding direction of the two winding areas 23, 24 is opposite the winding direction of the coil 21 is executed in opposite directions. This measure leads to the fact that, when the amplifier current is applied to the loudspeaker, the direction of current flow in the two winding areas 23, 24 differs from the direction of current flow in the coil 21.
  • the opposite direction of the current flow direction in the coil 21 with respect to the current flow direction in the two winding areas 23, 24 can also be realized in another - not shown - embodiment example in that with the winding direction of the coil 21 and the two winding areas 23, 24 in the same direction it is ensured that when the winding areas 23, 24 and the coil 21 are then to be contacted in parallel, the polarity of the coil connection is opposite the connection of the two winding areas 23, 24 is different.
  • the distance between the coil 21 and the two winding areas 23, 24 on the outer jacket 20 of the voice coil bobbin 19 is such that when the coil 21st leaves the air gap 25, which in this way approaches the winding area 23, 24 approaching the air gap 25 into the area of influence of the magnetic field prevailing in the air gap 25, ensures that the braking process does not start abruptly, but softly.
  • the centering of the voice coil bobbin 19 on the pole core 15 is carried out by the centering membrane 26 in a known manner.
  • FIG. 1 Another drive system for a long-throw bass speaker 10 is illustrated in FIG.
  • the magnet pot 11 of this system differs from the system shown in FIG. 1 in that the lower pole plate 14 is annular.
  • the thickness of the lower pole plate 14 corresponds to the thickness of the upper pole plate 12.
  • the housing cover 27 is arranged on the surface of the lower pole plate 14 which faces away from the permanent magnet 13. This housing cover 27 closes the magnetic pot 11 on the side which faces away from the membrane 16.
  • an intermediate piece 30 is arranged between the housing cover 27 and the lower pole plate 14.
  • One end of the pole core 15 is connected to the inner surface of the housing cover 27.
  • the free end of the pole core 15 is guided up to the upper pole plate 12 and terminates with this in terms of height.
  • the diameter of the pole core 15 is reduced compared to the inner diameter of the upper pole plate 12, permanent magnet 13 and lower pole plate, so that a distance from the latter components is maintained.
  • the area of the pole core 15 which is adjacent to the permanent magnet 13 has a constriction 28 with a reduced diameter compared to the areas which are adjacent to the upper pole plate 12 and the lower pole plate 14. This measure ensures that the bundling of the magnetic field lines in the areas between the upper pole plate 12 and the pole core 15 or the lower pole plate 14 and the pole core 15 is particularly good.
  • the area of the constriction 28 is designed as a neodymium-iron-boron disk.
  • the magnetization of this disk is opposite to that of the permanent magnet 13. This formation of the constriction 28 ensures that the induction in the air gaps 25.1, 25.2 is raised.
  • the magnet system is also shown in the rest position in FIG.
  • the voice coil bobbin 19, which surrounds the pole core 15, is designed so long that it projects below the side of the lower pole plate 14, which faces away from the membrane 16, by more than half the thickness of the lower pole plate 14.
  • the upper pole plate 12 is arranged next to the coil 21.
  • the coil arrangement 22 is formed on the part of the outer jacket 20 of the voice coil bobbin 19 which is adjacent to the lower pole plate 14.
  • the winding width of the coil 21 on the outer jacket 20 of the voice coil former 19 projects above the upper pole plate 12 at the same distance.
  • the winding width of the coil arrangement 22 also corresponds to the winding width of the coil 21 and also projects beyond the lower pole plate 14 on both sides at the same distance.
  • the thickness of the permanent magnet 13 is selected so that a distance is maintained between the closest regions of the coil 21 and the coil arrangement 22.
  • Another centering membrane 29 is arranged between the free end of the voice coil bobbin 19 and the housing cover 27.
  • the coil 21 and the coil arrangement 22 are connected in series (not shown), but the winding direction of coil 21 and coil arrangement 22 is listed in opposite directions.
  • the coil 21 and the coil arrangement 22 can also be contacted in parallel if it is ensured that the connection polarity of the coil 21 and the coil arrangement 22 is different.
  • the coil 21 and the coil arrangement 22 are subjected to the amplifier power, this causes both the coil 21 and the coil arrangement 22 to drive the voice coil bobbin 19. If, for example, as a result of exposure to the amplifier power of the voice coil bobbin 19, it moves in the direction of the arrow, the coil 21 leaves the air gap 25.1 and the coil arrangement 22 approaches this air gap 25.1. However, since the current flow direction in the coil arrangement 22 is opposite to the current flow direction in the coil 21, this immersion of the coil arrangement 22 in the air gap 25.1 causes a braking force to be built up which acts counter to the lifting force indicated by the arrow. As soon as the lifting force and braking force are in equilibrium, the voice coil former 19 cannot move any further in the direction of the arrow. This ensures that the principle just explained also causes the voice coil bobbin 19 to brake in the opposite direction, so that the voice coil bobbin 19 does not exceed its maximum permissible stroke even with a soft design of the fastening elements.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Stereophonic System (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP91120015A 1990-12-24 1991-11-23 Système de commande pour un haut-parleur basse fréquence à excursion large Expired - Lifetime EP0492142B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041858A DE4041858A1 (de) 1990-12-24 1990-12-24 Antriebssystem fuer langhubige tieftonlautsprecher
DE4041858 1990-12-24

Publications (3)

Publication Number Publication Date
EP0492142A2 true EP0492142A2 (fr) 1992-07-01
EP0492142A3 EP0492142A3 (en) 1993-02-10
EP0492142B1 EP0492142B1 (fr) 1995-07-26

Family

ID=6421495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120015A Expired - Lifetime EP0492142B1 (fr) 1990-12-24 1991-11-23 Système de commande pour un haut-parleur basse fréquence à excursion large

Country Status (4)

Country Link
EP (1) EP0492142B1 (fr)
AT (1) ATE125662T1 (fr)
DE (2) DE4041858A1 (fr)
DK (1) DK0492142T3 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278251A (en) * 1993-04-21 1994-11-23 Samsung Electro Mech Loudspeaker including magnetic flux cancellation coil
WO1994027413A1 (fr) * 1993-05-10 1994-11-24 Scan-Speak A/S Haut-parleur comprenant des bagues en court-circuit placees au niveau de la bobine mobile
US5446797A (en) * 1992-07-17 1995-08-29 Linaeum Corporation Audio transducer with etched voice coil
US5604815A (en) * 1992-07-17 1997-02-18 Linaeum Corporation Single magnet audio transducer and method of manufacturing
WO1997018688A1 (fr) * 1995-11-10 1997-05-22 Granger Frederic Suspension centrale ou peripherique d'un equipage mobile d'un haut-parleur electrodynamique
US5748760A (en) * 1995-04-18 1998-05-05 Harman International Industries, Inc. Dual coil drive with multipurpose housing
EP0903961A2 (fr) * 1997-09-22 1999-03-24 Jbl Incorporated Amortissement inductif de l'unité d'actionnement dans un haut-parleur à deux bobines
WO2000067523A2 (fr) * 1999-04-29 2000-11-09 New Transducers Limited Systeme d'entrainement de bobines mobiles
US6735322B1 (en) * 1999-09-14 2004-05-11 Pioneer Corporation Speaker
WO2007031901A1 (fr) 2005-09-15 2007-03-22 Pss Belgium N.V. Haut-parleur electrodynamique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8385580B2 (en) 2006-08-31 2013-02-26 Adamson Systems Engineering Inc. High power low frequency transducers and method of assembly
DE102007016582B3 (de) * 2007-04-07 2008-06-19 Technische Universität Dresden Magnetostatischer Lautsprecher, insbesondere Tieftonlautsprecher

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983337A (en) * 1973-06-21 1976-09-28 Babbco, Ltd. Broad-band acoustic speaker
FR2362549A1 (fr) * 1976-08-19 1978-03-17 Mainardi Jacques Dispositif permettant de controler la forme du signal fourni par un haut-parleur
FR2559332A1 (fr) * 1984-02-02 1985-08-09 Ruelle Jean Louis Transducteur electromagnetique lineaire symetrique
DE3629856A1 (de) * 1985-09-02 1987-04-02 Pioneer Electronic Corp Ausgeglichenes kraftfahrzeug-lautsprechersystem
US4783824A (en) * 1984-10-23 1988-11-08 Trio Kabushiki Kaisha Speaker unit having two voice coils wound around a common coil bobbin

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7121351U (de) * 1971-09-02 Isophon Werke Gmbh Mit zwei oder mehreren Wicklungen ver sehene Schwingspule fur dynamische Laut Sprecher
DE1913371U (de) * 1964-11-20 1965-04-08 Sennheiser Electronic Dynamischer, elektroakustischer wandler (lautsprecher).
GB1442468A (en) * 1973-07-02 1976-07-14 Sony Corp Loudspeakers
DE2528482A1 (de) * 1975-06-26 1977-01-13 Canton Elektronik Gmbh & Co Elektroakustischer wandler
GB2010639B (en) * 1977-12-14 1982-05-19 Matsushita Electric Ind Co Ltd Transducer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983337A (en) * 1973-06-21 1976-09-28 Babbco, Ltd. Broad-band acoustic speaker
FR2362549A1 (fr) * 1976-08-19 1978-03-17 Mainardi Jacques Dispositif permettant de controler la forme du signal fourni par un haut-parleur
FR2559332A1 (fr) * 1984-02-02 1985-08-09 Ruelle Jean Louis Transducteur electromagnetique lineaire symetrique
US4783824A (en) * 1984-10-23 1988-11-08 Trio Kabushiki Kaisha Speaker unit having two voice coils wound around a common coil bobbin
DE3629856A1 (de) * 1985-09-02 1987-04-02 Pioneer Electronic Corp Ausgeglichenes kraftfahrzeug-lautsprechersystem

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446797A (en) * 1992-07-17 1995-08-29 Linaeum Corporation Audio transducer with etched voice coil
US5604815A (en) * 1992-07-17 1997-02-18 Linaeum Corporation Single magnet audio transducer and method of manufacturing
GB2278251A (en) * 1993-04-21 1994-11-23 Samsung Electro Mech Loudspeaker including magnetic flux cancellation coil
GB2278251B (en) * 1993-04-21 1997-04-02 Samsung Electro Mech Speaker
WO1994027413A1 (fr) * 1993-05-10 1994-11-24 Scan-Speak A/S Haut-parleur comprenant des bagues en court-circuit placees au niveau de la bobine mobile
GB2292651A (en) * 1993-05-10 1996-02-28 Scan Speak As Loudspeaker with short circuit rings at the voice coil
GB2292651B (en) * 1993-05-10 1997-04-02 Scan Speak As Loudspeaker with short circuit rings at the voice coil
US5748760A (en) * 1995-04-18 1998-05-05 Harman International Industries, Inc. Dual coil drive with multipurpose housing
WO1997018688A1 (fr) * 1995-11-10 1997-05-22 Granger Frederic Suspension centrale ou peripherique d'un equipage mobile d'un haut-parleur electrodynamique
EP0903961A2 (fr) * 1997-09-22 1999-03-24 Jbl Incorporated Amortissement inductif de l'unité d'actionnement dans un haut-parleur à deux bobines
EP0903961A3 (fr) * 1997-09-22 2006-10-18 Jbl Incorporated Amortissement inductif de l'unité d'actionnement dans un haut-parleur à deux bobines
WO2000067523A2 (fr) * 1999-04-29 2000-11-09 New Transducers Limited Systeme d'entrainement de bobines mobiles
WO2000067523A3 (fr) * 1999-04-29 2001-02-08 New Transducers Ltd Systeme d'entrainement de bobines mobiles
US6735322B1 (en) * 1999-09-14 2004-05-11 Pioneer Corporation Speaker
WO2007031901A1 (fr) 2005-09-15 2007-03-22 Pss Belgium N.V. Haut-parleur electrodynamique
JP2009509376A (ja) * 2005-09-15 2009-03-05 ピーエスエス・ベルギー・エヌブイ ダイナミックスピーカ装置

Also Published As

Publication number Publication date
ATE125662T1 (de) 1995-08-15
EP0492142B1 (fr) 1995-07-26
DE4041858A1 (de) 1992-07-02
EP0492142A3 (en) 1993-02-10
DK0492142T3 (da) 1995-12-11
DE59106088D1 (de) 1995-08-31

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