EP0492142B1 - Driver system for an extended-travel bass loudspeaker - Google Patents
Driver system for an extended-travel bass loudspeaker Download PDFInfo
- Publication number
- EP0492142B1 EP0492142B1 EP91120015A EP91120015A EP0492142B1 EP 0492142 B1 EP0492142 B1 EP 0492142B1 EP 91120015 A EP91120015 A EP 91120015A EP 91120015 A EP91120015 A EP 91120015A EP 0492142 B1 EP0492142 B1 EP 0492142B1
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- coil
- winding
- pole plate
- voice
- area
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- 238000004804 winding Methods 0.000 claims abstract description 46
- 241000239290 Araneae Species 0.000 claims 2
- 238000010276 construction Methods 0.000 claims 1
- 239000012528 membrane Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 238000005476 soldering Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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 turns lying 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 hitting 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 thus have a large range of linear spring tension, without the risk of the maximum permissible stroke being at peak loads of the vibrating parts is exceeded.
- an upper winding area or a lower winding area is arranged on the outer jacket of the voice coil bobbin and axially spaced on both sides of the coil, that the upper winding area and the lower winding area and the coil are acted upon by the amplifier power and that the current flow direction in the coil is opposite to the direction of current flow in the upper and lower winding areas.
- the voice coil carrier is braked in its movement as soon as the coil arrangement between the air gap upper pole plate and pole core immersed.
- the active braking of the voice coil former ie using the amplifier power, also has the effect that the braking effect is increased compared to the known arrangements.
- 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. In particular, this keeps the weight load, which is caused by the additional winding areas, within limits, so that changes in the inertia of the oscillating system can be neglected.
- the axial distance between the two winding areas to the coil 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 elastic.
- Figure 1 shows a section through the magnet system of a long-throw bass speaker.
- FIG. 1 shows a section through a long-stroke magnet system of a woofer 10.
- the magnet pot 11 is formed by an upper, annular 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 facing the membrane 16 of the annular surface of the permanent magnet 13 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 bobbin 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 is different 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, which approaches 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.
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Abstract
Description
Die Erfindung befaßt sich mit einem Antriebssystem für langhubige Tieftonlautsprecher.The invention relates to a drive system for long-throw woofers.
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 diaphragm diameter. However, in applications in which, due to the space available at the installation location, it is not possible to use a loudspeaker dimensioned according to the above-mentioned requirement, good low-frequency reproduction should nevertheless take place by means of a separate low-frequency loudspeaker, so 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.There are limits to the measure described above and in the reduction of the membrane diameter and in the long-stroke design of the magnet system. 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 according to the above requirement is followed, this has the disadvantage that the fastening elements must then be made so soft in long-stroke drive systems 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 turns lying 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 hitting the bottom of the magnetic pot is known from Funkschau 1986,
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 thus have a large range of linear spring tension, without the risk of the maximum permissible stroke being at peak loads of the vibrating parts is exceeded.
Diese Aufgabe wird dadurch gelöst, daß auf dem Außenmantel des Schwingspulenträgers und axial beabstandet beidseitig zur Spule ein oberer Wickelbereich bzw. ein unterer Wickelbereich angeordnet ist, daß der obere Wickelbereich und der untere Wickelbereich sowie die Spule von der Verstärkerleistung beaufschlagt sind und daß die Stromflußrichtung in der Spule im Vergleich zu der Stromflußrichtung in dem oberen und dem unteren Wickelbereich gegensinnig ist.This object is achieved in that an upper winding area or a lower winding area is arranged on the outer jacket of the voice coil bobbin and axially spaced on both sides of the coil, that the upper winding area and the lower winding area and the coil are acted upon by the amplifier power and that the current flow direction in the coil is opposite to the direction of current flow in the upper and lower winding areas.
Durch die Beaufschlagung der beiden Wickelbereiche 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 two winding areas, it is achieved that the voice coil carrier is braked in its movement as soon as the coil arrangement between the air gap upper pole plate and pole core immersed. The active braking of the voice coil former, ie using the amplifier power, also has the effect that the braking effect is increased compared to the known arrangements.
Vorteilhafte Aus- und Weiterbildungen der Erfindung sind den Ansprüchen 2 bis 4 entnehmbar.Advantageous further developments of the invention can be found in claims 2 to 4.
Ist gemäß Anspruch 2 die Wickelbreite der beiden Wickelbereiche gegenüber der Wickelbreite der Spule vermindert, bleibt der zusätzliche Aufwand für die aktiv angesteuerte Bremse des Schwingspulenträgers gering. Insbesondere hält sich dadurch die Gewichtsbelastung, welche durch die zusätzlichen Wickelbereiche verursacht wird, in Grenzen, so daß Trägheitsveränderungen des schwingenden Systems vernachlässigt werden können.If, according to claim 2, 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. In particular, this keeps the weight load, which is caused by the additional winding areas, within limits, so that changes in the inertia of the oscillating system can be neglected.
Ist gemäß Anspruch 4 der axiale Abstand der beiden Wickelbereiche zur Spule 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, wird sichergestellt, daß die Bremswirkung elastisch einsetzt.If, according to claim 4, the axial distance between the two winding areas to the coil 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 elastic.
Es zeigt:It shows:
Figur 1 einen Schnitt durch das Magnetsystem eines langhubig ausgelegten Tieftonlautsprechers.Figure 1 shows a section through the magnet system of a long-throw bass speaker.
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
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
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
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
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
Die Zentrierung der Schwingspulenträgers 19 auf dem Polkern 15 wird von der Zentriermembran 26 in bekannter Weise übernommen.The centering of the
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
Claims (4)
- Drive system for long-throw, low-frequency loudspeakers,- with an upper, circular pole plate (12) arranged centrally to the centre axis of the loudspeaker- with a circular permanent magnet (13) which is likewise arranged centrally to the centre axis of the loudspeaker, and whose upper annular face which faces the diaphragm (16) is connected to the upper pole plate (12),- with a circular, lower pole plate (14) arranged centrally to the centre axis of the loudspeaker and connected to the lower annular face of the permanent magnet (13),- with a pole core (15) which is encircled centrally at a distance by the upper pole plate (12) and the permanent magnet (13),- with a voice-coil former (19) of tubular construction, whose one end is connected to the diaphragm (16) and, in the rest position of the system, whose other end encircles at least the upper part of the end of the pole core (15) facing the diaphragm (16), by projecting into the air-gap (25),- with a coil (21), the width of whose winding is equivalent to at least twice the thickness of the upper pole plate (12), and is permanently arranged symmetrically to the upper pole plate (12) at the position on the outer surface (20) of the voice-coil former (19) which, in the rest position of the system, is adjacent to the upper pole plate (12), and- with a spider (26) which is connected to the loudspeaker frame (18) and the voice-coil former (19) in the area between the coil (21) and the diaphragm (16), and which spider (26) maintains the voice-coil former (19) centrally to the pole core (15) in all operating states of the system,characterised in that- an upper winding area (23) or a lower winding area (24), respectively, is arranged on the outer surface (20) of the voice-coil former (19) at an axial distance on both sides of the coil (21),- the upper coil area (23) and the lower coil area (24) as well as the coil (21) receive the amplifier power and- the direction of current flow in the coil (21) is opposite to the direction of current flow in the upper and lower winding area (23, 24).
- Drive system according to Claim 1, characterised in that the winding width of the upper and lower winding area (23, 24) is reduced with respect to the winding width of the coil (21).
- Drive system according to Claim 1 or Claim 2, characterised in that each winding area (23, 24) is arranged on the outer surface (20) of the voice-coil former (19) at the same distance from the coil (21).
- Drive system according to one of the Claims 1 to 3, characterised in that the distance between the winding areas (23, 24) and the coil (21) is such that when the system is operating, at least one part of the winding width of the respective winding area (23, 24) which is approaching the air-gap (25) is inserted into the air-gap (25) before the coil (21) has completely left the air-gap (25).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4041858 | 1990-12-24 | ||
| DE4041858A DE4041858A1 (en) | 1990-12-24 | 1990-12-24 | DRIVE SYSTEM FOR LONG-HUBBED LOW SPEAKER |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0492142A2 EP0492142A2 (en) | 1992-07-01 |
| EP0492142A3 EP0492142A3 (en) | 1993-02-10 |
| EP0492142B1 true 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 (1)
| 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 |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994003026A1 (en) * | 1992-07-17 | 1994-02-03 | Linaeum Corporation | Audio transducer with etched voice coil |
| US5446797A (en) * | 1992-07-17 | 1995-08-29 | Linaeum Corporation | Audio transducer with etched voice coil |
| DE4413945C2 (en) * | 1993-04-21 | 1995-09-21 | Samsung Electro Mech | speaker |
| DK54093D0 (en) * | 1993-05-10 | 1993-05-10 | Scan Speak As | SPEAKER |
| WO1996033592A1 (en) * | 1995-04-18 | 1996-10-24 | Harman International Industries, Inc. | Dual coil drive with multipurpose housing |
| CH687353A5 (en) * | 1995-11-10 | 1996-11-15 | Granger Frederic | Central or peripheral suspension of movable equipment of electrodynamic loudspeaker |
| US5828767A (en) * | 1997-09-22 | 1998-10-27 | Jbl Inc. | Inductive braking in a dual coil speaker driver unit |
| WO2000067523A2 (en) * | 1999-04-29 | 2000-11-09 | New Transducers Limited | Moving coil driver |
| JP3984397B2 (en) * | 1999-09-14 | 2007-10-03 | パイオニア株式会社 | Speaker |
| WO2007031901A1 (en) | 2005-09-15 | 2007-03-22 | Pss Belgium N.V. | Electrodynamic loudspeaker device |
| 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 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7121351U (en) * | 1971-09-02 | Isophon Werke Gmbh | Voice coil with two or more windings for dynamic loud speakers | |
| DE1913371U (en) * | 1964-11-20 | 1965-04-08 | Sennheiser Electronic | DYNAMIC, ELECTROACOUSTIC CONVERTER (SPEAKER). |
| US3983337A (en) * | 1973-06-21 | 1976-09-28 | Babbco, Ltd. | Broad-band acoustic speaker |
| GB1442468A (en) * | 1973-07-02 | 1976-07-14 | Sony Corp | Loudspeakers |
| DE2528482A1 (en) * | 1975-06-26 | 1977-01-13 | Canton Elektronik Gmbh & Co | Moving coil loudspeaker with spherical or biconical membrane - is driven from both ends by two opposing in-phase electromagnetic drives |
| 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 |
| GB2010639B (en) * | 1977-12-14 | 1982-05-19 | Matsushita Electric Ind Co Ltd | Transducer |
| FR2559332B1 (en) * | 1984-02-02 | 1987-02-20 | Ruelle Jean Louis | SYMMETRIC LINEAR ELECTROMAGNETIC TRANSDUCER |
| JPS6175696U (en) * | 1984-10-23 | 1986-05-21 | ||
| JP2501948Y2 (en) * | 1985-09-02 | 1996-06-19 | パイオニア株式会社 | In-vehicle audio system |
-
1990
- 1990-12-24 DE DE4041858A patent/DE4041858A1/en not_active Withdrawn
-
1991
- 1991-11-23 DE DE59106088T patent/DE59106088D1/en not_active Expired - Fee Related
- 1991-11-23 AT AT91120015T patent/ATE125662T1/en not_active IP Right Cessation
- 1991-11-23 DK DK91120015.2T patent/DK0492142T3/en active
- 1991-11-23 EP EP91120015A patent/EP0492142B1/en not_active Expired - Lifetime
Cited By (1)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| DK0492142T3 (en) | 1995-12-11 |
| DE4041858A1 (en) | 1992-07-02 |
| ATE125662T1 (en) | 1995-08-15 |
| EP0492142A2 (en) | 1992-07-01 |
| DE59106088D1 (en) | 1995-08-31 |
| EP0492142A3 (en) | 1993-02-10 |
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