EP0492142A2 - Driver system for an extended-travel bass loudspeaker - Google Patents

Driver system for an extended-travel bass loudspeaker 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
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German (de)
French (fr)
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EP0492142B1 (en
EP0492142A3 (en
Inventor
Rüdiger Dipl.-Ing. Fleischer
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Nokia Deutschland GmbH
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Nokia Deutschland GmbH
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Publication of EP0492142A3 publication Critical patent/EP0492142A3/en
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    • 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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  • Acoustics & Sound (AREA)
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Abstract

According to the invention, a drive system designed with extended travel for bass loudspeakers (10) is specified which prevents the voice coil (21) from impinging on the magnet bottom pot and the voice coil (21) from coming to rest on the top pole plate (12) even if the mounting elements are designed to be very soft. For this purpose, a further coil arrangement (22), to which the amplifier power is also applied, is arranged on the voice coil former (19). Since the current is designed to flow in the opposite direction in coil (21) and coil arrangement (22), the voice coil former (19) is actively decelerated as soon as one of the two winding areas (23; 24) plunges into the air gap (25). <IMAGE>

Description

Technisches GebietTechnical field

Die Erfindung befaßt sich mit einem Antriebssystem für langhubige Tieftonlautsprecher.The invention relates to a drive system for long-throw woofers.

Stand der TechnikState of the art

Tieftonlautsprecher sind im Stand der Technik weit verbreitet, so daß auch das Antriebssystem keiner über die im Oberbegriff von Anspruch 1 hinausgehende Erläuterung bedarf.Low-frequency loudspeakers are widespread in the prior art, so that the drive system does not require any explanation beyond the preamble of claim 1.

Zur guten Wiedergabe tieferer Frequenzen gilt in der Lautsprechertechnik die allgemeine Forderung, den Membrandurchmesser möglichst groß zu wählen. Soll jedoch in Anwendungsfällen, in denen wegen des Platzangebotes am Einbauort kein entsprechend der vorstehend angeführten Forderung dimensionierter Lautsprecher einsetzbar ist, gleichwohl eine gute Tieftonwiedergabe mittels eines separaten Tieftonlautsprechers erfolgen, so gehört es zum bekannten Wissen, den Schalldruck mittels eines Tieftonlautsprechers abzustrahlen, der über einen verkleinerten, dem Platzangebot am Einbauort angepaßten Membrandurchmesser sowie ein langhubig ausgelegtes Magnetsystem verfügt. Unter einem langhubig ausgelegten Magnetsystem wird in dieser Anmeldung ein Magnetsystem verstanden, bei dem die Längsausdehnung der Schwingspule auf dem Schwingspulenträger mindestens der 1,5-fachen Dicke der oberen Polplatte entspricht.For good reproduction of lower frequencies, the general requirement in loudspeaker technology is to choose the largest possible membrane diameter. However, in applications in which, due to the space available at the installation location, no loudspeaker dimensioned according to the above-mentioned requirement can be used, good low-frequency reproduction should nevertheless take place by means of a separate low-frequency loudspeaker, it is known knowledge to use sound pressure using a To emit the woofer, which has a reduced diaphragm diameter, adapted to the space available at the installation location, and a long-stroke magnet system. In this application, 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.

Der zuvor beschriebenen und in der Verkleinerung des Membrandurchmessers sowie in der langhubigen Auslegung des Magnetsystemes liegenden Maßnahme sind Grenzen gesetzt. Diese rühren daher, daß - sollen Verzerrungen bei der Wiedergabe vermieden werden - mit steigender Langhubigkeit des Magnetsystems die Befestigungselemente (Sicke und Zentriermembran), die die Membran und den Schwingspulenträger mit dem Lautsprecherchassis verbinden, immer weicher ausgebildet werden müssen. Dies deshalb, weil nur entsprechend weich ausgelegte Befestigungselemente in der Lage sind, dem Hubweg langhubiger Magnetsysteme über die gesamte Wegstrecke eine lineare Federkraft entgegenzustellen. Wird jedoch gemäß der vorstehenden Forderung verfahren, hat dies den Nachteil, daß dann bei langhubigen Antriebssystemen die Befestigungselemente so weich ausgebildet werden müssen, daß sie bei Spitzenbelastungen des Lautsprechers nicht mehr in der Lage sind, mittels ihrer, dem Hub entgegenwirkenden Federkraft den maximal zulässigen Hubweg der schwingenden Teile (Membran und Schwingspulenträger) zu begrenzen. Die Folge ist dann, daß der Schwingspulenträger beziehungsweise die Schwingspule entweder auf dem Boden des Magnettopfs aufschlägt bzw. diese Teile sich bei einem Auswährtshubs soweit vom Polkern entfernen, daß sie bei der Rückwärtsbewegung aufgrund fehlender Zentrierung zum Polkern auf der oberen Polplatte aufsetzen. Zur Vermeidung dieser Nachteile bei langhubigen Magnetsystemen mit weich ausgelegten Befestigungselementen ist ein Lautsprecher des Herstellers SEAS bekannt, bei dem jeweils mehrere, am oberen und unteren Rand der Schwingspule liegende Windungen mittels einer Auftragslötung miteinander kurzgeschlossen sind. Diese Kurzschlußbereiche bewirken, daß, wenn sie in den Luftspalt zwischen oberer Polplatte und Polkern eintauchen, ein Strom induziert wird. Die Folge ist, daß die Spule abgebremst wird und selbst unter Spitzenbelastungen ihren maximal zulässigen Hubweg nicht überschreitet. Wenngleich mittels dieser bekannten Anordnung ein Aufschlagen der Spule auf dem Boden bzw. ein Aufsetzen der Spule auf der oberen Polplatte vermieden wird, ist dies eine sehr aufwendige Maßnahme zur Nachteilsbeseitigung. Dies deshalb, weil zum einen zur Vorbereitung der Auftragslötung die jeweiligen und schon auf dem Schwingspulenträger angeordneten Windungen außerordentlich vorsichtig angeschliffen werden müssen. Zum weiteren machen die beiden Auftragslötungen, welche jeweils den Kurzschluß zwischen den oberen bzw. unteren Windungen der Spule herstellen, eine Verbreiterung des Luftspaltes erforderlich.The measures described above and in the reduction of the membrane diameter and in the long-stroke design of the magnet system are limited. These stem from the fact that - to avoid distortion during playback - the mounting elements (bead and centering membrane), which connect the membrane and the voice coil bobbin to the loudspeaker chassis, have to be made softer and softer with increasing long-travel of the magnet system. This is because only appropriately soft fasteners are able to counter the stroke of long-stroke magnet systems over the entire distance with a linear spring force. However, if the procedure is carried out according to the above requirement, this has the disadvantage that the fastening elements in long-stroke drive systems must be made so soft that they are no longer able to withstand peak loads on the loudspeaker, by means of their spring force counteracting the stroke, the maximum permitted stroke limit the vibrating parts (membrane and voice coil former). The result is that the voice coil former or the voice coil either hits the bottom of the magnetic pot or these parts move so far from the pole core during an extension stroke that they move backwards due to the lack of centering on the pole core, place on the upper pole plate. To avoid these disadvantages in the case of long-stroke magnet systems with softly designed fastening elements, a loudspeaker from the manufacturer SEAS is known 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. Although 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. This is because, on the one hand, in order to prepare the order soldering, the respective turns already arranged on the voice coil former must be ground very carefully. Furthermore, the two application solderings, which each produce the short circuit between the upper and lower turns of the coil, make it necessary to widen the air gap.

Eine andere, ein Anstoßen des Schwingspulenträgers auf dem Boden des Magnettopfes verhindernde Maßnahme ist aus der Zeitschrift Funkschau 1986, Heft 17, Seite 29 bekannt. Dazu ist zwischen unterer Polplatte und Polkern ein weiterer Luftspalt, der sogenannte Bremsluftspalt angeordnet. Das in diesem Bremsluftspalt vorherrschende Magnetfeld ist dem Feld im Luftspalt zwischen oberer Polplatte und Polkern entgegengerichtet, so daß die Spule, sobald sie in den Bremsluftspalt eintaucht, abgebremst wird. Nachteilig ist bei dieser bekannten Anordnung, daß nur die einwärts zum Boden des Magnettopfes gerichtete Hubbewegung des Schwingspulenträgers abgebremst wird. Die Begrenzung des maximal zulässigen Hubweges für auswärts gerichtete Hubbewegungen kann bei dieser Anordnung nur unter Einsatz entsprechend hart ausgelegter Befestigungselemente sichergestellt werden.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. For this purpose, another air gap, the so-called brake air gap, is arranged between the lower pole plate and the pole core. 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.

Daher liegt der Erfindung die Aufgabe zugrunde, ein Antriebssystem für langhubige Tieftonlautsprecher anzugeben, welches die Nachteile der bekannten Anordnungen vermeidet und sehr weich ausgelegte und somit einen großen Bereich linearer Federspannung aufweisende Befestigungselemente zuläßt, ohne daß bei Spitzenbelastungen die Gefahr besteht, daß der maximal zulässige Hubweg der schwingenden Teile überschritten wird.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.

Darstellung der ErfindungPresentation of the invention

Diese Aufgabe wird dadurch gelöst, daß auf dem Außenmantel des Schwingspulenträgers und beabstandet zur ersten Spule eine weitere Spulenanordnung angeordnet ist, diese Spulenanordnung - ebenso wie die Spule - mit der Verstärkerleistung beaufschlagt ist, wobei allerdings die Stromflußrichtung in Spule und Spulenanordnung gegensinnig ist.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.

Durch die Beaufschlagung der Spulenanordnung mit der Verstärkerleistung wird erreicht, daß der Schwingspulenträger in seiner Bewegung abgebremst wird, sobald die Spulenanordnung in den Luftspalt zwischen oberer Polplatte und Polkern eintaucht. Das aktive, d.h. unter Einsatz der Verstärkerleistung erfolgende Abbremsen des Schwingspulenträgers bewirkt außerdem, daß gegenüber den bekannten Anordnungen die Bremswirkung verstärkt ist.By applying the amplifier power to the coil arrangement, 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.

Ist gemäß Anspruch 2 die Spulenanordnung in einen oberen und unteren Wickelbereich unterteilt und befinden sich alle Wickelbereiche in gleichem Abstand zur Spule, so läßt sich die Schwingspule bzw. der Schwingspulenträger in jeder der beiden möglichen Hubrichtungen abbremsen. Dadurch, daß die Wickelbreite der beiden Wickelbereiche gegenüber der Wickelbreite der Spule vermindert ist, bleibt der zusätzliche Aufwand für die aktiv angesteuerte Bremse des Schwingspulenträgers gering.If, according to claim 2, 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.

Wird gemäß Anspruch 3 der Abstand von der Spule zu den beiden Wickelbereichen so gewählt, daß während des Betriebs des Systems der sich jeweils der oberen Polplatte nähernde Wickelbereich schon dann in den Luftspalt eintaucht, bevor die Spule den Luftspalt verlassen hat, ist sichergestellt, daß die Bremswirkung elastisch einsetzt.If, according to claim 3, 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.

Ist nach Anspruch 4 die untere Polplatte kreisringförmig ausgebildet, entspricht ihre Dicke der Dicke der oberen Polplatte, ist der Polkern so lang bemessen, daß er von der unteren Polplatte mit Abstand ummantelt wird und im übrigen die dem Dauermagneten abgewandte Seite der unteren Polplatte unterragt, weist das freie Ende des Schwingspulenträgers eine solche Baulänge auf, daß es die dem Dauermagneten abgewandte Fläche der unteren Polplatte in Ruhestellung des Systems mit mindestens der halben Dicke der unteren Polplatte unterragt, ist die Spulenanordnung eine weitere, der Wickelbreite der Spule entsprechende Spule und die Spulenanordnung symetrisch zur unteren Polplatte an der Stelle auf dem Außenmantel des Schwingspulenträgers fest angeordnet, die in Ruhestellung des Systems der unteren Polplatte benachbart ist, hat dies den Vorteil, daß beide Spulen (Spule und Spulenanordnung) zum Antrieb der Membran beitragen und erst wenn eine der beiden Spulen in den Luftspalt der anderen Spule eintaucht, die Bremswirkung einsetzt.If, according to claim 4, 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.

Werden gemäß Anspruch 5 der Abstand von Spule und Spulenanordnung zueinander und die Höhe des Dauermagneten so aufeinander abgestimmt, daß beim Betrieb des Systems vor Erreichen der maximalen Auslenkung jeweils ein Teil beider Spulen in einen Luftspalt ragen, bewirkt dies, daß die Bewegung des Schwingspulenträgers elastisch abgebremst wird. Durch eine weitere Zentriermembran nach Anspruch 6 wird die Zentrierung des Schwingspulenträgers verbessert. Weist der Polkern - wie in Anspruch 7 angegeben - in dem Bereich, der dem Dauermagneten benachbart ist, eine Einschnürung auf, hat dies den Vorteil, daß die Bündelung der Feldlinien im Bereich zwischen Polkern und den Polplatten besonders gut ist.If, according to claim 5, 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.

Ist gemäß Anspruch 8 der Bereich des Polkerns der die Einschnürung aufweist von einer magnetisch hochenergetischen Scheibe, vorzugsweise einer Neodym-Scheibe gebildet und weist diese Scheibe eine gegenüber dem Dauermagneten entgegengesetzte Magnetisierung auf, hat dies den Vorteil, daß die Induktion in den Luftspalten angehoben wird.If, according to claim 8, 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.

Kurze Darstellung der FigurenBrief presentation of the figures

Es zeigen:

  • Figur 1 einen Schnitt durch das Magnetsystem eines langhubig ausgelegten Tieftonlautsprechers; und
  • Figur 2 einen weiteren Schnitt durch ein Magnetsystem eines langhubig ausgelegten Tieftonlautsprechers.
Show it:
  • Figure 1 shows a section through the magnet system of a long-throw bass speaker; and
  • Figure 2 shows a further section through a magnet system of a long-throw bass speaker.

Wege zum Ausführen der ErfindungWays of Carrying Out the Invention

Die in Figur 1 gezeigte Darstellung zeigt einen Schnitt durch ein langhubig ausgelegtes Magnetsystem eines Tieftonlautsprechers 10.The illustration shown in FIG. 1 shows a section through a long-stroke magnet system of a woofer 10.

Der Magnettopf 11 wird von einer oberen, kreisringförmig ausgebildeten Polplatte 12, einem ebenfalls kreisringförmigen Dauermagneten 13 und einer unteren Polplatte 14 sowie einem Polkern 15 gebildet, in dem die obere Polplatte 12 mit der der Membran 16 zugewandten Seite der Kreisringfläche des Dauermagneten 13 und die untere Polplatte 14 mit der anderen Kreisringfläche des Dauermagneten 13 verbunden ist und der Polkern 15 zentrisch zur Lautsprechermittelachse in den Raum 17 eingesetzt und mit der unteren Polplatte 14 verbunden ist. Die Seite der oberen Polplatte 12, welche der Membran 16 zugewandt ist, ist mit dem konusförmig ausgebildeten Lautsprecherkorb 18 verbunden. In den Lautsprecherkorb 18 ist die Membran 16 eingesetzt. Die Membran 16 und der Lautsprecherkorb 18 sind an ihren Enden, welche jeweils die größeren Durchmesser aufweisen, mittels einer Sicke (nicht dargestellt) miteinander verbunden. An das Ende der Membran 16, welches den kleineren Durchmesser aufweist, ist der rohrförmig ausgebildete Schwingspulenträger 19 angesetzt. Das freie Ende des Schwingspulenträgers 19 ragt unter teilweiser Ummantelung des Polkerns 15 in den Raum 17 hinein. Auf dem Außenmantel 20 des Schwingspulenträgers 19 ist die Spule 21 angeordnet. Die Wickelbreite der Spule 21 entspricht etwa der doppelten Dicke der oberen Polplatte 12. Der in Figur 1 veranschaulichte Betriebszustand des Systems entspricht demjenigen der Ruhestellung des Lautsprechers 10. Aus diesem Grunde ist - wie die Figur 1 hervorhebt - auch die Spule 21 der oberen Polplatte nebengeordnet und überragt deren Dicke beidseitig mit gleichem Abstand.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.

Beabstandet zur Spule 21 ist auf dem Außenmantel 20 des Schwingspulenträgers 19 die Spulenanordnung 22 angeordnet. Diese Spulenanordnung 22 wird von einem oberen Wickelbereich 23 und einem unteren Wickelbereich 24 gebildet. Beide Wickelbereiche 23, 24 haben gleichen Abstand zur Spule 21. Bei dem in Figur 1 dargestellten Tieftonlautsprecher 10 sind die beiden Wickelbereiche 23, 24 mit der Spule 21 in Reihe geschaltet, wobei jedoch die Wickelrichtung der beiden Wickelbereiche 23, 24 gegenüber der Wickelrichtung der Spule 21 gegensinnig ausgeführt ist. Diese Maßnahme führt dazu, daß, wenn der Lautsprecher mit dem Verstärkerstrom beaufschlagt wird, die Stromflußrichtung in den beiden Wickelbereichen 23, 24 gegenüber der Stromflußrichtung in der Spule 21 verschieden ist.At a distance from the coil 21, 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. In the woofer 10 shown in FIG. 1, 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.

Die Gegenläufigkeit der Stromflußrichtung in der Spule 21 gegenüber der Stromflußrichtung in den beiden Wickelbereichen 23, 24 kann in einem anderen - nicht dargestellten - Ausführungsbeispiel auch dadurch realisiert sein, daß bei gleichläufiger Wickelrichtung von Spule 21 und der beiden Wickelbereichen 23, 24 sichergestellt ist, daß bei der dann notwendigen parallel auszuführenden Kontaktierung der Wickelbereiche 23, 24 und der Spule 21 die Polarität des Spulenanschlusses gegenüber dem Anschluß der beiden Wickelbereiche 23, 24 verschieden ist.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.

Wird die in Figur 1 dargestellte Anordnung mit der Verstärkerleistung beaufschlagt, bewirkt dies, daß die Spule 21 beziehungsweise der mit ihr verbundene Schwingspulenträger 19 die in Figur 1 gezeigte Ruhestellung verläßt. Diese Hubbewegung hält so lange an, bis einer der beiden Wickelbereiche 23;24 in den Einflußbereich des im
Luftspalt 25 vorherrschenden Magnetfeldes gelangt. Die gegenüber der Spule 21 gegenläufige Stromflußrichtung in dem jeweiligen, in den Luftspalt 25 eintauchenden Wickelbereich 23;24 bewirkt, daß sie hierdurch eine Kraft aufbaut, die der Hubkraft entgegengesetzt ist. Gelangen beide Kräfte (Hubkraft und Bremskraft) ins Gleichgewicht, bewirkt dies ein vollständiges Abbremsen des Schwingspulenträgers 19. Ist der Abstand zwischen der Spule 21 und den beiden Wickelbereichen 23, 24 auf dem Außenmantel 20 des Schwingspulenträgers 19 so bemessen, daß, wenn die Spule 21 den Luftspalt 25 verläßt, der sich hierdurch dem Luftspalt 25 nähernde Wickelbereich 23, 24 in den Einflußbereich des im Luftspalt 25 vorherrschenden Magnetfeldes gerät, ist sichergestellt, daß der Bremsvorgang nicht abrupt, sondern weich einsetzt.If the arrangement shown in FIG. 1 is acted upon by the amplifier power, this causes the coil 21 or the voice coil support 19 connected to it to leave the rest position shown in FIG. This lifting movement continues until one of the two winding areas 23, 24 enters the area of influence of the
Air gap 25 prevailing magnetic field. The direction of current flow opposite to the coil 21 in the respective winding area 23, 24 immersed in the air gap 25 causes it to build up a force that is opposite to the lifting force. If the two forces (lifting force and braking force) are in equilibrium, this causes the voice coil bobbin 19 to brake completely. If 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.

Die Zentrierung der Schwingspulenträgers 19 auf dem Polkern 15 wird von der Zentriermembran 26 in bekannter Weise übernommen.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.

Der Aufwand, der für die beiden als aktive Bremsen dienenden Wickelbereiche 23, 24 getrieben werden muß, ist gering. Wie in diesem Zusammenhang Figur 1 darlegt, ist nämlich zur Erzielung der Bremswirkung nur eine im Vergleich zur Wickelbreite der Spule 21 erheblich verminderte Wickelbreite in den Wickelbereichen 23, 24 notwendig.The effort required for the two winding areas 23, 24 serving as active brakes is low. As shown in this context in FIG. 1, only one is significant in order to achieve the braking effect compared to the winding width of the coil 21 reduced winding width in the winding areas 23, 24 necessary.

In der Figur 2 ist ein weiteres Antriebssystem für einen langhubig ausgelegten Tieftonlautsprecher 10 veranschaulicht. Der Magnettopf 11 dieses Systems unterscheidet sich von dem in Figur 1 dargestellten System dadurch, daß die untere Polplatte 14 kreisringförmig ausgebildet ist. Die Dicke der unteren Polplatte 14 entspricht der Dicke der oberen Polplatte 12. An der Fläche der unteren Polplatte 14, die dem Dauermagneten 13 abgewandt ist, ist der Gehäusedeckel 27 angeordnet. Dieser Gehäusedeckel 27 verschließt den Magnettopf 11 auf der Seite, welche der Membran 16 abgewandt ist. Im in Fig.2 dargestellten Ausführungsbeispiel ist dazu zwischen dem Gehäusedeckel 27 und der unteren Polplatte 14 noch ein Zwischenstück 30 angeordnet. Das eine Ende des Polkerns 15 ist mit der Innenfläche des Gehäusedeckel 27 verbunden. Das freie Ende des Polkerns 15 ist bis zur oberen Polplatte 12 geführt und schließt mit dieser höhenmäßig ab. Der Durchmesser des Polkerns 15 ist gegenüber dem Innendurchmesser von oberer Polplatte 12, Dauermagnet 13 und unterer Polplatte vermindert, so daß ein Abstand zu den letztgenannten Bauteilen eingehalten wird. Derjenige Bereich des Polkerns 15, der dem Dauermagneten 13 benachbart ist, weist gegenüber den Bereichen, die der oberen Polplatte 12 und der unteren Polplatte 14 benachbart sind, eine Einschnürung 28 mit vermindertem Durchmesser auf. Durch diese Maßnahme wird sichergestellt, daß die Bündelung der magnetischen Feldlinien in den Bereichen zwischen oberer Polplatte 12 und Polkern 15 beziehungsweise unterer Polplatte 14 und Polkern 15 besonders gut ausfällt.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. In the exemplary embodiment shown in FIG. 2, 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.

Der Bereich der Einschnürung 28 ist als Neodym-Eisen-Bor-Scheibe ausgebildet. Die Magnetisierung dieser Scheibe ist gegenüber dem Dauermagneten 13 entgegengesetzt ausgebildet. Diese Ausbildung der Einschnürung 28 stellt sicher, daß die Induktion in den Luftspalten 25.1, 25.2 angehoben wird.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.

Auch in Figur 2 ist das Magnetsystem in Ruhestellung dargestellt.The magnet system is also shown in the rest position in FIG.

Der Schwingspulenträger 19, welcher den Polkern 15 ummantelt, ist so lang ausgebildet, daß er die Seite der unteren Polplatte 14, welche der Membran 16 abgewandt ist, mit mehr als der Hälfte der Dicke der unteren Polplatte 14 unterragt. Auf dem Außenmantel 20 des Schwingspulenträgers 19 ist der oberen Polplatte 12 die Spule 21 nebengeordnet. Auf dem Teil des Außenmantels 20 des Schwingspulenträgers 19, der der unteren Polplatte 14 nebengeordnet ist, ist die Spulenanordnung 22 ausgebildet.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. On the outer jacket 20 of the voice coil bobbin 19, 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.

Die Wickelbreite der Spule 21 auf dem Außenmantel 20 des Schwingspulenträgers 19 überragt die obere Polplatte 12 mit gleichem Abstand. Auch die Wickelbreite der Spulenanordnung 22 entspricht der Wickelbreite der Spule 21 und überragt die untere Polplatte 14 ebenfalls beidseitig mit gleichem Abstand. Die Dicke des Dauermagneten 13 ist so gewählt, daß zwischen den einander nächsten Bereichen von Spule 21 und Spulenanordnung 22 ein Abstand gewahrt ist. Eine weitere Zentriermembran 29 ist zwischen dem freien Ende des Schwingspulenträgers 19 und dem Gehäusedeckel 27 angeordnet.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.

Auch in diesem Ausführungsbeispiel sind die Spule 21 und die Spulenanordnung 22 in Reihe geschaltet (nicht dargestellt), wobei jedoch die Wickelrichtung von Spule 21 und Spulenanordnung 22 gegensinnig aufgeführt ist. In einem anderen - nicht dargestellten - Ausführungsbeispiel können die Spule 21 und die Spulenanordnung 22 auch parallel kontaktiert werden, wenn sichergestellt ist, daß die Anschlußpolung von Spule 21 und Spulenanordnung 22 verschieden ist.In this exemplary embodiment, too, 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. In another embodiment, not shown, 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.

Werden nun im Betrieb des Lautsprechers 10 die Spule 21 und die Spulenanordnung 22 mit der Verstärkerleistung beaufschlagt, bewirkt dies, daß sowohl die Spule 21 als auch die Spulenanordnung 22 für den Antrieb des Schwingspulenträgers 19 sorgen. Vollführt beispielsweise infolge der Beaufschlagung durch die Verstärkerleistung der Schwingspulenträger 19 eine Bewegung in Pfeilrichtung, so verläßt die Spule 21 den Luftspalt 25.1 und die Spulenanordnung 22 nähert sich diesem Luftspalt 25.1. Da aber die Stromflußrichtung in der Spulenanordnung 22 gegenüber der Stromflußrichtung in der Spule 21 gegenläufig ist, bewirkt dieses Eintauchen der Spulenanordnung 22 in den Luftspalt 25.1, daß eine Bremskraft aufgebaut wird, die entgegen der durch den Pfeil angedeuteten Hubkraft wirkt. Sobald Hubkraft und Bremskraft im Gleichgewicht stehen, kann sich der Schwingspulenträger 19 nicht weiter in Pfeilrichtung bewegen. Hierdurch wird sichergestellt, da auch das eben erläuterte Prinzip in die umgekehrte Richtung ein Abbremsen des Schwingspulenträgers 19 bewirkt, daß der Schwingspulenträger 19 auch bei weicher Auslegung der Befestigungselemente seinen maximal zulässigen Hub nicht überschreitet.If, during operation of the loudspeaker 10, 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.

Claims (8)

Antriebssystem für langhubige Tieftonlautsprecher, - mit einer oberen, kreisringförmig ausgebildeten und zentrisch zur Lautsprechermittelachse angeordneten Polplatte (12) - mit einem kreisringförmigen Dauermagneten (13), der ebenfalls zentrisch zur Lautsprechermittelachse angeordnet ist und dessen obere, der Membran (16) zugewandte Kreisringfläche mit der oberen Polplatte (12) verbunden ist, - mit einer kreisrunden, zentrisch zum Lautsprechermittelachse angeordneten unteren Polplatte (14), die mit der unteren Kreisringfläche des Dauermagneten (13) verbunden ist. - mit einem Polkern (15), der von der oberen Polplatte (12) und dem Dauermagneten (13) mit Abstand zentrisch ummantelt ist, - mit einem rohrförmig ausgebildeten Schwingspulenträger (19), dessen eines Ende mit der Membran (16) verbunden ist und dessen anderes Ende in Ruhestellung des Systems wenigstens den oberen Teil des der Membran (16) zugewandten Endes des Polkerns (15) ummantelt, indem er in den Luftspalt (25) hineinragt, - mit einer Spule (21), deren Wickelbreite mindestens der zweifachen Dicke der oberen Polplatte (12) entspricht und die symetrisch zur oberen Polplatte (12) an der Stelle auf dem Außenmantel (20) des Schwingspulenträgers (19) fest angeordnet ist, die in Ruhestellung des Systems der oberen Polplatte (12) nebengeordnet ist, und - mit einer Zentriermembran (26), die mit dem Lautsprecherkorb (18) und dem Schwingspulenträger (19) im Bereich zwischen Spule (21) und Membran (16) verbunden ist und die den Schwingspulenträger (19) in jedem Betriebszustand des Systems zentrisch zum Polkern (15) hält,

dadurch gekennzeichnet, - daß auf dem Außenmantel (20) des Schwingspulenträgers (19) und axial beabstandet zur ersten Spule (21) eine weitere Spulenanordnung (22) angeordnet ist, - daß die Spulenanordnung (22) ebenso wie die Spule (21) mit der Verstärkerleistung beaufschlagt ist, und - daß die Stromflußrichtung in Spule (21) und Spulenanordnung (22) gegensinnig ist. Drive system for long-throw woofers, - With an upper, circularly shaped pole plate (12) arranged centrally to the loudspeaker center axis - With an annular permanent magnet (13), which is also arranged centrally to the loudspeaker central axis and whose upper, the membrane (16) facing annular surface is connected to the upper pole plate (12), - With a circular, arranged centrally to the loudspeaker center axis lower pole plate (14) which is connected to the lower annular surface of the permanent magnet (13). - With a pole core (15) which is sheathed centrally by the upper pole plate (12) and the permanent magnet (13), - With a tubular voice coil former (19), one end of which is connected to the membrane (16) and the other end in the rest position of the system at least the upper part of the membrane (16) facing end of the pole core (15) by sheathing protrudes into the air gap (25), - With a coil (21), the winding width at least corresponds to twice the thickness of the upper pole plate (12) and which is symmetrical to the upper pole plate (12) at the location on the outer jacket (20) of the voice coil former (19) which is adjacent to the upper pole plate (12) when the system is at rest , and - With a centering membrane (26), which is connected to the speaker basket (18) and the voice coil former (19) in the area between the coil (21) and membrane (16) and the voice coil former (19) in any operating state of the system centered on the pole core (15) holds

characterized, - That on the outer jacket (20) of the voice coil bobbin (19) and axially spaced from the first coil (21) a further coil arrangement (22) is arranged, - That the coil arrangement (22) as well as the coil (21) is acted upon by the amplifier power, and - That the current flow direction in the coil (21) and coil arrangement (22) is in opposite directions. Antriebssystem nach Anspruch 1,
dadurch gekennzeichnet,
daß die Spulenanordnung (22) aus einem oberen Wickelbereich (23) und einem unteren Wickelbereich (24) gebildet ist, wobei jeder Wickelbereich (23,24) eine gegenüber der Wickelbreite der Spule (21) verminderte Wickelbreite aufweist und wobei jeder Wickelbereich (23,24) in gleichem Abstand zur Spule (21) auf dem Außenmantel (20) des Schwingspulenträgers (19) angeordnet ist.Drive system according to claim 1,
characterized,
that the coil arrangement (22) is formed from an upper winding area (23) and a lower winding area (24), each winding area (23, 24) having a winding width that is smaller than the winding width of the coil (21), and wherein each winding area (23, 24) is arranged at the same distance from the coil (21) on the outer jacket (20) of the voice coil former (19). Antriebssystem nach Anspruch 2,
dadurch gekennzeichnet,
daß der Abstand zwischen den Wickelbereichen (23,24) und der Spule (21) so bemessen ist, daß im Betrieb des Systems der sich jeweils dem Luftspalt (25) nähernde Wickelbereich (23;24) zumindest mit einem Teil seiner Wickelbreite in den Luftspalt (25) eintaucht, bevor die Spule (21) den Luftspalt (25) völlig verlassen hat.Drive system according to claim 2,
characterized,
that the distance between the winding areas (23, 24) and the coil (21) is dimensioned such that during operation of the system the winding area (23; 24) approaching the air gap (25) in each case at least with a part of its winding width into the air gap (25) dips before the coil (21) has completely left the air gap (25). Antriebssystem nach Anspruch 1,
dadurch gekennzeichnet, - daß die untere Polplatte (14) kreisringförmig ausgebildet ist und die Dicke dieser Polplatte (14) der Dicke der oberen Polplatte (12) entspricht, - daß der Polkern (15) so lang bemessen ist, daß er von der unteren Polplatte (14) mit Abstand ummantelt ist und im übrigen die dem Dauermagneten (13) abgewandte Seite der unteren Polplatte (14) unterragt, - daß das freie Ende des Schwingspulenträgers (19) die dem Dauermagneten (13) abgewandte Fläche der unteren Polplatte (14) in Ruhestellung des Systems mit mindestens der halben Dicke der unteren Polplatte (14) unterragt, - daß die Spulenanordnung (22) eine weitere Spule ist, die eine der Spule (21) entsprechende Wickelbreite aufweist, und - daß die Spulenanordnung (22) symetrisch zur unteren Polplatte (14) an der Stelle auf dem Außenmantel (20) des Schwingspulenträgers (19) fest angeordnet ist, die in Ruhestellung des Systems der unteren Polplatte (14) benachbart ist. Drive system according to claim 1,
characterized, - That the lower pole plate (14) is annular and the thickness of this pole plate (14) corresponds to the thickness of the upper pole plate (12), - That the pole core (15) is dimensioned so long that it is sheathed at a distance from the lower pole plate (14) and beyond the side of the lower pole plate (14) facing away from the permanent magnet (13), - That the free end of the voice coil bobbin (19) projects beyond the surface of the lower pole plate (14) facing away from the permanent magnet (13) when the system is at rest with at least half the thickness of the lower pole plate (14), - That the coil arrangement (22) is a further coil having a winding width corresponding to the coil (21), and - That the coil arrangement (22) symmetrically to the lower pole plate (14) at the location on the outer jacket (20) of the voice coil former (19) is fixedly arranged, which is adjacent to the lower pole plate (14) in the rest position of the system. Antriebssystem nach Anspruch 4,
dadurch gekennzeichnet,
daß die Wickelbreiten von Spule (21) und Spulenanordnung (22) sowie die Höhe des Dauermagneten (13) so aufeinander abgestimmt sind, daß im Betrieb des Systems kurz vor dem Erreichen des maximalen Hubs die Spulenanordnung (22) in den Einflußbereich des im Luftspalt (25.1) vorherrschenden Magnetfeldes bzw. die Spule (21) bei entgegengesetztem Hub in den Einflußbereich des im Luftspalt (25.2) vorherrschenden Magnetfeldes eintaucht.Drive system according to claim 4,
characterized,
that the winding widths of the coil (21) and coil arrangement (22) and the height of the permanent magnet (13) are coordinated with one another in such a way that during operation of the system shortly before the maximum stroke is reached, the coil arrangement (22) falls within the range of influence of the air gap ( 25.1) of the prevailing magnetic field or the coil (21) with opposite stroke immersed in the area of influence of the magnetic field prevailing in the air gap (25.2). Antriebssystem nach einem der Ansprüche 3 oder 4,
dadurch gekennzeichnet,
daß am freien, die untere Polplatte (14) unterragenden Ende des Schwingspulenträgers (19) eine weitere Zentriermembran (29) angeordnet ist, welche den Schwingspulenträger (19) mit dem Gehäuseboden (27) verbindet.Drive system according to one of claims 3 or 4,
characterized,
that a further centering membrane (29) is arranged at the free end of the voice coil former (19) projecting from the lower pole plate (14) and connects the voice coil former (19) to the housing base (27). Antriebssystem nach einem der Ansprüche 4 bis 6,
dadurch gekennzeichnet,
daß der Polkern (15) in den Bereichen, die den Polplatten (12,14) benachbart sind, der Dicke der Polplatten (12,14) entsprechende, parallel zu den Polplatten (12,14) verlaufende Flanken aufweist und in dem Bereich, der dem Dauermagneten (13) benachbart ist, eine Einschnürung (28) mit einem gegenüber dem Durchmesser des Polkerns (15) zwischen den Polplatten (12,14) verminderten Durchmesser aufweist.Drive system according to one of claims 4 to 6,
characterized,
that the pole core (15) in the regions which are adjacent to the pole plates (12, 14) has flanks corresponding to the thickness of the pole plates (12, 14) and parallel to the pole plates (12, 14) and in the region which the permanent magnet (13) is adjacent, has a constriction (28) with a smaller diameter than the diameter of the pole core (15) between the pole plates (12, 14). Antriebssystem nach Anspruch 7,
dadurch gekennzeichnet,
daß der Bereich des Polkerns (15) der die Einschnürung (28) aufweist von einer magnetisch hochenergetischen Scheibe, vorzugsweise einer Neodym-Scheibe gebildet ist und daß diese Scheibe eine gegenüber dem Dauermagneten (13) entgegengesetzte Magnetisierung aufweist.Drive system according to claim 7,
characterized,
that the area of the pole core (15) which has the constriction (28) is formed by a magnetically high-energy disk, preferably a neodymium disk, and that this disk has an opposite magnetization to the permanent magnet (13).
EP91120015A 1990-12-24 1991-11-23 Driver system for an extended-travel bass loudspeaker Expired - Lifetime EP0492142B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041858A DE4041858A1 (en) 1990-12-24 1990-12-24 DRIVE SYSTEM FOR LONG-HUBBED LOW SPEAKER
DE4041858 1990-12-24

Publications (3)

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

Family

ID=6421495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120015A Expired - Lifetime EP0492142B1 (en) 1990-12-24 1991-11-23 Driver system for an extended-travel bass loudspeaker

Country Status (4)

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

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 (en) * 1993-05-10 1994-11-24 Scan-Speak A/S Loudspeaker with short circuit rings at the voice coil
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 (en) * 1995-11-10 1997-05-22 Granger Frederic Central or circumferential suspension for the moving assembly of a moving-coil loudspeaker
US5748760A (en) * 1995-04-18 1998-05-05 Harman International Industries, Inc. Dual coil drive with multipurpose housing
EP0903961A2 (en) * 1997-09-22 1999-03-24 Jbl Incorporated Inductive braking in a dual coil speaker driver unit
WO2000067523A2 (en) * 1999-04-29 2000-11-09 New Transducers Limited Moving coil driver
US6735322B1 (en) * 1999-09-14 2004-05-11 Pioneer Corporation Speaker
WO2007031901A1 (en) 2005-09-15 2007-03-22 Pss Belgium N.V. Electrodynamic loudspeaker device

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 (en) * 2007-04-07 2008-06-19 Technische Universität Dresden Magnetostatic loudspeaker, in particular low range loudspeaker, has two partly magnetically conductive housing shells which are carried against permanent magnetic arrangement of repulsive magnetization

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FR2362549A1 (en) * 1976-08-19 1978-03-17 Mainardi Jacques Loudspeaker with two moving coils - has main coil and auxiliary coil which may function as servo or damping element
FR2559332A1 (en) * 1984-02-02 1985-08-09 Ruelle Jean Louis Symmetric linear electromagnetic transducer.
DE3629856A1 (en) * 1985-09-02 1987-04-02 Pioneer Electronic Corp BALANCED MOTOR VEHICLE SPEAKER SYSTEM
US4783824A (en) * 1984-10-23 1988-11-08 Trio Kabushiki Kaisha Speaker unit having two voice coils wound around a common coil bobbin

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GB2010639B (en) * 1977-12-14 1982-05-19 Matsushita Electric Ind Co Ltd Transducer

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US3983337A (en) * 1973-06-21 1976-09-28 Babbco, Ltd. Broad-band acoustic speaker
FR2362549A1 (en) * 1976-08-19 1978-03-17 Mainardi Jacques Loudspeaker with two moving coils - has main coil and auxiliary coil which may function as servo or damping element
FR2559332A1 (en) * 1984-02-02 1985-08-09 Ruelle Jean Louis Symmetric linear electromagnetic transducer.
US4783824A (en) * 1984-10-23 1988-11-08 Trio Kabushiki Kaisha Speaker unit having two voice coils wound around a common coil bobbin
DE3629856A1 (en) * 1985-09-02 1987-04-02 Pioneer Electronic Corp BALANCED MOTOR VEHICLE SPEAKER SYSTEM

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 (en) * 1993-05-10 1994-11-24 Scan-Speak A/S Loudspeaker with short circuit rings at the voice coil
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 (en) * 1995-11-10 1997-05-22 Granger Frederic Central or circumferential suspension for the moving assembly of a moving-coil loudspeaker
EP0903961A2 (en) * 1997-09-22 1999-03-24 Jbl Incorporated Inductive braking in a dual coil speaker driver unit
EP0903961A3 (en) * 1997-09-22 2006-10-18 Jbl Incorporated Inductive braking in a dual coil speaker driver unit
WO2000067523A2 (en) * 1999-04-29 2000-11-09 New Transducers Limited Moving coil driver
WO2000067523A3 (en) * 1999-04-29 2001-02-08 New Transducers Ltd Moving coil driver
US6735322B1 (en) * 1999-09-14 2004-05-11 Pioneer Corporation Speaker
WO2007031901A1 (en) 2005-09-15 2007-03-22 Pss Belgium N.V. Electrodynamic loudspeaker device
JP2009509376A (en) * 2005-09-15 2009-03-05 ピーエスエス・ベルギー・エヌブイ Dynamic speaker device

Also Published As

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

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