EP0480160B1 - Dome-shaped high-frequency loudspeaker - Google Patents

Dome-shaped high-frequency loudspeaker Download PDF

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Publication number
EP0480160B1
EP0480160B1 EP91114500A EP91114500A EP0480160B1 EP 0480160 B1 EP0480160 B1 EP 0480160B1 EP 91114500 A EP91114500 A EP 91114500A EP 91114500 A EP91114500 A EP 91114500A EP 0480160 B1 EP0480160 B1 EP 0480160B1
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EP
European Patent Office
Prior art keywords
housing part
magnet pot
pot
diaphragm
piece
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.)
Expired - Lifetime
Application number
EP91114500A
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German (de)
French (fr)
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EP0480160A2 (en
EP0480160A3 (en
Inventor
Ulrich Kizak
Kurt Leipold
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Nokia Deutschland GmbH
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Nokia Deutschland GmbH
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Publication of EP0480160A2 publication Critical patent/EP0480160A2/en
Publication of EP0480160A3 publication Critical patent/EP0480160A3/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
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped

Definitions

  • the invention is concerned with the reduction of dome tweeters.
  • dome tweeters have been known for some time in the prior art and are used in large quantities for a wide range of applications where high-frequency sound signals have to be reproduced.
  • These known loudspeakers have in common that they have a magnetic pot in which a pole core is inserted centrally and at a distance from the inner surface of the magnetic pot.
  • the voice coil projects at this distance between the pole core and the inner surface of the magnetic pot.
  • the end of the voice coil facing away from the magnetic pot is connected to an approximately hemispherical membrane.
  • the voice coil is held centrally on the pole core by a centering membrane.
  • the membrane and centering membrane are usually designed as a one-piece component.
  • the magnetic pot is connected to a housing part, which, moreover, covers the membrane and the centering membrane on the side facing away from the magnetic pot.
  • the membrane is usually glued into the housing part.
  • the connection of the magnetic pot and the housing part is conventionally implemented as an adhesive connection.
  • the housing part can have acoustic equalizers in the area of the sound passage openings.
  • loudspeakers are known from DE-A-2 556 639, in which, in order to equalize the forces acting on the peripheral edge of the membrane, the peripheral edge is clamped between two edges by two housing parts which can be locked together. In order to rule out that the connection between the two housing parts is released under the weight of the magnet system, the one housing part that receives the magnet system is pot-shaped.
  • loudspeakers of the type described above are to be used to reproduce high-frequency tones, these usually have diaphragm diameters or voice coil diameters of approximately 19 to 25 millimeters (see, for example, Funkschau 1983, number 7, page 99, page 100). These diameters require an appropriately large-sized magnetic pot with outside diameters of around 35 to 45 millimeters for acceptable sound reproduction. If the dome tweeter is to be reduced in size due to cramped installation conditions, this is not simply possible by simply reducing the diameter of the voice coil or magnetic pot. This is due to the fact that even with a reduced voice coil diameter, the size of the magnetic pot can only be reduced to a smaller extent. A Improvement is achieved in that the pole core is partially formed from a high-energy material.
  • the loudspeaker can still be too large for very cramped installation conditions. This is due to the fact that the edge of the membrane, which is provided for gluing to the housing part, must be designed to be relatively wide in order to meet the requirements of a sufficient adhesive connection. But even if you ignore the effect of the width of the adhesive edge on the size of the loudspeaker, it has been shown in conventionally constructed loudspeakers with a voice coil diameter ⁇ 19 mm that the efficiency of these reduced loudspeakers decreases sharply.
  • the invention is therefore based on the object of specifying a dome tweeter loudspeaker which, with good efficiency, has a magnetic pot outer diameter of less than or equal to 25 millimeters.
  • the diameter of the voice coil is ⁇ 19 mm
  • the housing part is connected to the magnetic pot exclusively by means of snappers arranged on the housing edge, in which the snap-on devices, with their molded-on latching hooks, engage around a collar arranged on the outer surface of the magnetic pot that the one-piece membrane is fixed in position between the housing part and the magnetic pot only after the magnetic pot has latched in that the part of the membrane, which rests on the magnetic pot, is pressed onto the magnetic pot by means of the free end of the tube piece arranged on the housing part and that joining aids are arranged on the outer surface of the magnetic pot and on the inner surface of the housing part in the area in which the two components overlap.
  • dome tweeters are designed in accordance with the invention, they can even be connected together with another loudspeaker as a coaxial loudspeaker arrangement due to their reduced size for further space savings.
  • the joining aids ensure that an exact positioning of the magnetic pot in the housing part or the exact positioning of the housing part on the magnetic pot is ensured. In addition, a change in position of the magnetic pot in the housing part during operation of the loudspeaker is excluded by the joining aid.
  • Dome tweeter 10 are essentially formed by a one-piece housing part 11 made of plastic and a magnetic pot 12.
  • a pole core 14 is arranged in the interior of the magnetic pot 12, centered on the central axis of the loudspeaker 10 and at a distance from the inner surfaces 13 of the magnetic pot 12.
  • This pole core 14 is formed by an upper pole plate 15 and a disk 17 interposed between the pole plate 15 and the bottom 16 of the magnetic pot 12.
  • the disk 17 consists of a magnetically high-energy material.
  • the voice coil 19 projects into the distance 18 between the pole core 14 and the inner surface 13 of the magnetic pot 12.
  • a hemispherical membrane 21 is connected to the circumference 20 of the voice coil 19, which faces away from the bottom 16 of the magnetic pot 12, and thus covers the pole core 14.
  • the membrane is surrounded on its outer circumference by a wave-shaped edge, the so-called centering membrane 22, the outer edge of this centering membrane 22 standing on the edge 23 of the magnet pot 12.
  • This centering membrane 22 has the task of centering the voice coil 19 at a distance 18 between the pole core 14 and the inner surface 13 of the magnetic pot.
  • the membrane 21 and the centering membrane 22 are formed in one piece from a plastic film.
  • the side of the magnetic pot facing away from the bottom 16 of the magnetic pot 12 is covered together with the membrane 21 and the centering membrane 22 by an approximately cup-shaped housing part 11, the housing edge 24 encasing a circumferential collar 25 arranged on the outer surface of the magnetic pot 12.
  • the cover 26 of the housing part 11 has a sound outlet opening 27 opposite the membrane 21 on.
  • This opening 27 is conical and has its largest diameter on the side facing away from the magnet pot 12.
  • a pipe piece 28 running centrally to the central axis of the loudspeaker, the free end 29 of which stands on the edge 23 of the magnetic pot 12 when the housing part 11 and the magnetic pot 12 are connected.
  • the centering membrane 22 has a circumferential flange which, when the housing part 11 and the magnet pot 12 are assembled, is pressed from the free end 29 of the tube piece 28 onto the upper edge 23 of the magnet pot 12. In this case, there is no separate connection of the centering membrane 22 on the edge 23 of the magnet pot 12.
  • the connection of the magnet pot 12 and the housing part 11 is made Simplified further, since simply inserting the centering membrane 22 and the membrane 21 connected to it and the voice coil 19 means that the two last-mentioned components are already precisely positioned at the distance 18 between the magnet pot 12 and the pole core 14.
  • An acoustic equalizer 30 is arranged centrally in the sound passage opening 27 and connected to the edge of the opening 27 by webs 31.
  • the housing edge 24, which surrounds part of the outer lateral surface of the magnetic pot 12, has a plurality of spring-shaped catches 32 on its lateral surface. As illustrated in FIG. 3, these are each represented by two parallel and in the direction of the cover 26 extending slots 33 formed. The free end 34 of this catch 32 is provided with locking hooks 35.
  • the collar 25 arranged on the outer surface of the magnetic pot 12 causes the catches 32 to deflect elastically in the direction of the arrow .
  • suitable joining aids 36 must be arranged on the collar 25 and on the inner lateral surface of the housing edge 24 along the central axis of the loudspeaker 10, as illustrated in FIG. 2 .
  • the joining aids 36 illustrated in FIG. 2 are only examples. However, if joining aids 36 are provided, the magnet pot 12 is also fixed in position in the radial direction in the housing part 11.

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

Description

Die Erfindung befaßt sich mit der Verkleinerung von Kalotten-Hochton-Lautsprechern.The invention is concerned with the reduction of dome tweeters.

Stand der TechnikState of the art

Derartige Kalotten-Hochton-Lautsprecher sind seit geraumer Zeit im Stand der Technik bekannt und finden in hohen Stückzahlen dort ein weites Anwendungsfeld, wo es gilt, hochfrequente Tonsignale wiederzugeben. Diesen bekannten Lautsprechern ist gemein, daß sie einen Magnettopf aufweisen, in welchem zentrisch und mit Abstand zur Innenfläche des Magnettopfes ein Polkern eingesetzt ist. In diesem Abstand zwischen dem Polkern und der Innenfläche des Magnettopfes ragt die Schwingspule. Das vom Magnettopf abgewandte Ende der Schwingspule ist mit einer in etwa halbkugelförmig ausgebildeten Membran verbunden. Außerdem wird die Schwingspule von einer Zentriermembran zentrisch auf den Polkern gehalten. Membran und Zentriermembran sind dabei in aller Regel als einstückiges Bauteil ausgebildet. Der Magnettopf ist mit einem Gehäuseteil verbunden, welches im übrigen die Membran und die Zentriermembran auf der dem Magnettopf abgewandten Seite überdeckt. Die Membran ist üblicherweise in das Gehäuseteil eingeklebt. Die Verbindung von Magnettopf und Gehäuseteil ist herkömmlich als Klebeverbindung realisiert. Zur Klangbeeinflussung kann das Gehäuseteil im Bereich der Schalldurchtrittsöffnungen akustische Equalizer aufweisen.Such dome tweeters have been known for some time in the prior art and are used in large quantities for a wide range of applications where high-frequency sound signals have to be reproduced. These known loudspeakers have in common that they have a magnetic pot in which a pole core is inserted centrally and at a distance from the inner surface of the magnetic pot. The voice coil projects at this distance between the pole core and the inner surface of the magnetic pot. The end of the voice coil facing away from the magnetic pot is connected to an approximately hemispherical membrane. In addition, the voice coil is held centrally on the pole core by a centering membrane. The membrane and centering membrane are usually designed as a one-piece component. The magnetic pot is connected to a housing part, which, moreover, covers the membrane and the centering membrane on the side facing away from the magnetic pot. The membrane is usually glued into the housing part. The connection of the magnetic pot and the housing part is conventionally implemented as an adhesive connection. To influence the sound, the housing part can have acoustic equalizers in the area of the sound passage openings.

Neben den in Klebetechik gebildeten Ausführungen sind aus DE-A-2 556 639 Lautsprecher bekannt, bei denen zur Vergleichmäßigung der auf den Umfangsrand der Membran wirkenden Kräfte der Umfangsrand zwischen zwei Kanten von zwei miteinander verrastenbaren Gehäuseteilen eingekemmt wird. Um auszuschließen, daß sich die Verbindung der beiden Gehäuseteile unter dem Gewicht des Magnetsystems löst, ist das eine Gehäuseteil, welches das Magnetsystem aufnimmt, topfförmig ausgebildet.In addition to the designs formed in adhesive technology, loudspeakers are known from DE-A-2 556 639, in which, in order to equalize the forces acting on the peripheral edge of the membrane, the peripheral edge is clamped between two edges by two housing parts which can be locked together. In order to rule out that the connection between the two housing parts is released under the weight of the magnet system, the one housing part that receives the magnet system is pot-shaped.

Sollen Lautsprecher der oben beschriebenen Art zur Wiedergabe hochfrequenter Töne eingesetzt werden, weisen diese üblicherweise Membrandurchmesser beziehungsweise Schwingspulendurchmesser von etwa 19 bis 25 Millimeter (vgl. dazu etwa Funkschau 1983, Heft 7, Seite 99, Seite 100) auf. Diese Durchmesser erfordern zu einer akzeptablen Klangwiedergabe einen entsprechend großdimensionierten Magnettopf mit Außendurchmessern von etwa 35 bis 45 Millimetern auf. Soll der Kalotten-Hochton-Lautsprecher aufgrund beengter Einbauverhältnisse verkleinert werden, ist dies durch bloße Verkleinerung des Schwingspulen- bzw. Magnettopfdurchmessers nicht ohne weiteres möglich. Dies ist darauf zurückzuführen, daß auch bei verkleinertem Schwingspulendurchmesser die Größe des Magnettopfes nur unterproportional verkleinert werden kann. Eine Verbesserung wird dadurch erreicht, daß der Polkern teilweise aus einem hochenergetischen Material gebildet wird. In diesem Zusammenhang sei darauf hingewiesen, daß auch bei dieser speziellen Ausbildung des Polkerns der Lautsprecher für sehr beengte Einbauverhältnisse immer noch zu groß sein kann. Dies beruht darauf, daß der Rand der Membran, der zur Verklebung mit dem Gehäuseteil vorgesehen ist, relativ breit ausgelegt sein muß, um die Anforderungen einer genügenden Klebeverbindung zu erfüllen. Aber selbst dann, wenn man die Wirkung der Breite des Kleberandes auf die Größe des Lautsprechers unberücksichtigt läßt, hat sich bei herkömmlich aufgebauten Lautsprechern mit einem Schwingspulendurchmesser < 19 mm gezeigt, daß der Wirkungsgrad dieser verkleinerten Lautsprecher stark abnimmt.If loudspeakers of the type described above are to be used to reproduce high-frequency tones, these usually have diaphragm diameters or voice coil diameters of approximately 19 to 25 millimeters (see, for example, Funkschau 1983, number 7, page 99, page 100). These diameters require an appropriately large-sized magnetic pot with outside diameters of around 35 to 45 millimeters for acceptable sound reproduction. If the dome tweeter is to be reduced in size due to cramped installation conditions, this is not simply possible by simply reducing the diameter of the voice coil or magnetic pot. This is due to the fact that even with a reduced voice coil diameter, the size of the magnetic pot can only be reduced to a smaller extent. A Improvement is achieved in that the pole core is partially formed from a high-energy material. In this context, it should be pointed out that even with this special design of the pole core, the loudspeaker can still be too large for very cramped installation conditions. This is due to the fact that the edge of the membrane, which is provided for gluing to the housing part, must be designed to be relatively wide in order to meet the requirements of a sufficient adhesive connection. But even if you ignore the effect of the width of the adhesive edge on the size of the loudspeaker, it has been shown in conventionally constructed loudspeakers with a voice coil diameter <19 mm that the efficiency of these reduced loudspeakers decreases sharply.

Daher liegt der Erfindung die Aufgabe zugrunde, einen Kalotten-Hochton-Lautsprecher anzugeben, der bei gutem Wirkungsgrad einen Magnettopfaußendurchmesser von kleiner/gleich 25 Millimeter aufweist.The invention is therefore based on the object of specifying a dome tweeter loudspeaker which, with good efficiency, has a magnetic pot outer diameter of less than or equal to 25 millimeters.

Darstellung der ErfindungPresentation of the invention

Diese Aufgabe wird dadurch gelöst, daß der Durchmesser der Schwingspule < 19 mm ist, daß das Gehäuseteil ausschließlich mittels am Gehäuserand angeordneter Schnapper mit dem Magnettopf verbunden ist, in dem die Schnapper mit ihrem angeformten Rasthaken einen an der Außenfläche des Magnettopfes angeordneten Kragen umgreifen, daß die einstückige Membran nach dem Verrasten vom Magnettopf ausschließlich dadurch zwischen Gehäuseteil und Magnettopf lagefixiert ist, daß der Teil der Membran, welcher auf dem Magnettopf aufliegt, mittels des freien Endes des am Gehäuseteil angeordneten Rohrstücks auf den Magnettopf gepreßt ist und daß an der Außenfläche des Magnettopfes und an der Innenfläche des Gehäuseteils jeweils in dem Bereich, in dem sich beide Bauteile überlappen, Fügehilfen angeordnet sind.This object is achieved in that the diameter of the voice coil is <19 mm, that the housing part is connected to the magnetic pot exclusively by means of snappers arranged on the housing edge, in which the snap-on devices, with their molded-on latching hooks, engage around a collar arranged on the outer surface of the magnetic pot that the one-piece membrane is fixed in position between the housing part and the magnetic pot only after the magnetic pot has latched in that the part of the membrane, which rests on the magnetic pot, is pressed onto the magnetic pot by means of the free end of the tube piece arranged on the housing part and that joining aids are arranged on the outer surface of the magnetic pot and on the inner surface of the housing part in the area in which the two components overlap.

Werden die Kalotten-Hochton-Lautsprecher erfindungsgemäß ausgebildet, lassen sich diese aufgrund ihrer verkleinerten Bauform sogar zur weiteren Platzersparnis zusammen mit einem anderen Lautsprecher als Koaxiallautsprecheranordnung verbinden.If the dome tweeters are designed in accordance with the invention, they can even be connected together with another loudspeaker as a coaxial loudspeaker arrangement due to their reduced size for further space savings.

Die Fügehilfen bewirken, daß ein lagegenaues Einsetzen des Magnettopfes in das Gehäuseteil bzw. das lagegenaue Aufsetzen des Gehäuseteils auf den Magnettopf gewährleistet wird. Außerdem wird durch die Fügehilfe eine Lageänderung des Magnettopfes im Gehäuseteil während des Betriebes des Lautsprechers ausgeschlossen.The joining aids ensure that an exact positioning of the magnetic pot in the housing part or the exact positioning of the housing part on the magnetic pot is ensured. In addition, a change in position of the magnetic pot in the housing part during operation of the loudspeaker is excluded by the joining aid.

Kurze Beschreibung der FigurenBrief description of the figures

Es zeigen:

Figur 1
eine Schnittdarstellung eines Kalotten-Hochton-Lautsprechers in Seitenansicht;
Figur 2
einen Kalotten-Hochton-Lautsprecher gemäß Figur 1 in Draufsicht auf den Magnettopf; und
Figur 3
einen Kalotten-Hochton-Lautsprecher in Seitenansicht.
Show it:
Figure 1
a sectional view of a dome tweeter in side view;
Figure 2
a dome tweeter according to Figure 1 in plan view of the magnetic pot; and
Figure 3
a dome tweeter in side view.

Wege zum Ausführen der ErfindungWays of Carrying Out the Invention

Die Erfindung wird nun anhand eines Ausführungsbeispiels näher erläutert.The invention will now be explained in more detail using an exemplary embodiment.

Die äußeren Umrisse des in Figur 1 gezeigten Kalotten-Hochton-Lautsprechers 10 werden im wesentlichen von einem einstückigen, aus Kunststoff gebildeten Gehäuseteil 11 und einem Magnettopf 12 gebildet.The outer outline of the one shown in Figure 1 Dome tweeter 10 are essentially formed by a one-piece housing part 11 made of plastic and a magnetic pot 12.

Im Inneren des Magnettopfes 12 ist zentrisch zur Mittelachse des Lautsprechers 10 und beabstandet zu den Innenflächen 13 des Magnettopfes 12 ein Polkern 14 angeordnet. Dieser Polkern 14 wird von einer oberen Polplatte 15 und einem zwischen der Polplatte 15 und dem Boden 16 des Magnettopfes 12 zwischengelegten Scheibe 17 gebildet. Die Scheibe 17 besteht aus einem magnetisch hochenergetischen Werkstoff. In den Abstand 18 zwischen dem Polkern 14 und der Innenfläche 13 des Magnettopfes 12 ragt die Schwingspule 19. Mit dem Umfang 20 der Schwingspule 19, welche dem Boden 16 des Magnettopfes 12 abgewendet ist, ist eine halbkugelförmig ausgebildete Membran 21 verbunden und überdeckt somit den Polkern 14. In dem hier beschriebenen Ausführungsbeispiel wird die Membran an ihrem äußeren Umfang von einem wellenförmig ausgestalteten Rand, der sogenannten Zentriermembran 22, umrandet, wobei der äußere Rand dieser Zentriermembran 22 auf dem Rand 23 des Magnettopfes 12 aufsteht. Diese Zentriermembran 22 hat die Aufgabe, die Schwingspule 19 in dem Abstand 18 zwischen dem Polkern 14 und der Innenfläche 13 des Magnettopfes zu zentrieren. Die Membran 21 und die Zentriermembran 22 sind einstückig aus einer Kunststoffolie gebildet. Die dem Boden 16 des Magnettopfes 12 abgewandte Seite des Magnettopfes wird mitsamt der Membran 21 und der Zentriermembran 22 von einem in etwa topfförmig ausgestalteten Gehäuseteil 11 überdeckt, wobei der Gehäuserand 24 einen an der Außenfläche des Magnettopfes 12 angeordneten, umlaufenden Kragen 25 ummantelt. Der Deckel 26 des Gehäuseteils 11 weist gegenüber der Membran 21 eine Schallaustrittsöffnung 27 auf. Diese Öffnung 27 ist konisch ausgestaltet und hat ihren größten Durchmesser auf der dem Magnettopf 12 abgewandten Seite. An dem Rand der konischen Öffnung 27 mit dem kleineren Durchmesser schließt ein zentrisch zur Mittelachse des Lautsprechers verlaufendes Rohrstück 28 an, dessen freies Ende 29 im Zustand der Verbindung von Gehäuseteil 11 und Magnettopf 12 auf dem Rand 23 des Magnettopf 12 aufsteht. Besonders vorteilhaft ist es, wenn die Zentriermembran 22 einen umlaufenden Flansch aufweist, der beim Zusammenbau von Gehäuseteil 11 und Magnettopf 12 vom freien Ende 29 des Rohrstücks 28 auf den oberen Rand 23 des Magnettopfes 12 gepreßt wird. In diesem Falle entfällt eine gesonderte Verbindung der Zentriermembran 22 auf dem Rand 23 des Magnettopfes 12. Sind darüber hinaus der Innendurchmesser des Rohrstücks 28 und der Außendurchmesser sowie die Flankensteilheit des wellenförmigen Randes der Zentriermembran 22 aufeinander abgestimmt, wird die Verbindung von Magnettopf 12 und Gehäuseteil 11 weiter vereinfacht, da bereits durch schlichtes Einlegen der Zentriermembran 22 und der mit ihr verbundenen Membran 21 sowie der Schwingspule 19 die beiden letztbenannten Bauteile bereits lagegenau zum Abstand 18 zwischen dem Magnettopf 12 und dem Polkern 14 stehen.A pole core 14 is arranged in the interior of the magnetic pot 12, centered on the central axis of the loudspeaker 10 and at a distance from the inner surfaces 13 of the magnetic pot 12. This pole core 14 is formed by an upper pole plate 15 and a disk 17 interposed between the pole plate 15 and the bottom 16 of the magnetic pot 12. The disk 17 consists of a magnetically high-energy material. The voice coil 19 projects into the distance 18 between the pole core 14 and the inner surface 13 of the magnetic pot 12. A hemispherical membrane 21 is connected to the circumference 20 of the voice coil 19, which faces away from the bottom 16 of the magnetic pot 12, and thus covers the pole core 14. In the exemplary embodiment described here, the membrane is surrounded on its outer circumference by a wave-shaped edge, the so-called centering membrane 22, the outer edge of this centering membrane 22 standing on the edge 23 of the magnet pot 12. This centering membrane 22 has the task of centering the voice coil 19 at a distance 18 between the pole core 14 and the inner surface 13 of the magnetic pot. The membrane 21 and the centering membrane 22 are formed in one piece from a plastic film. The side of the magnetic pot facing away from the bottom 16 of the magnetic pot 12 is covered together with the membrane 21 and the centering membrane 22 by an approximately cup-shaped housing part 11, the housing edge 24 encasing a circumferential collar 25 arranged on the outer surface of the magnetic pot 12. The cover 26 of the housing part 11 has a sound outlet opening 27 opposite the membrane 21 on. This opening 27 is conical and has its largest diameter on the side facing away from the magnet pot 12. At the edge of the conical opening 27 with the smaller diameter adjoins a pipe piece 28 running centrally to the central axis of the loudspeaker, the free end 29 of which stands on the edge 23 of the magnetic pot 12 when the housing part 11 and the magnetic pot 12 are connected. It is particularly advantageous if the centering membrane 22 has a circumferential flange which, when the housing part 11 and the magnet pot 12 are assembled, is pressed from the free end 29 of the tube piece 28 onto the upper edge 23 of the magnet pot 12. In this case, there is no separate connection of the centering membrane 22 on the edge 23 of the magnet pot 12. If the inside diameter of the tube piece 28 and the outside diameter and the flank steepness of the wave-shaped edge of the centering membrane 22 are also matched to one another, the connection of the magnet pot 12 and the housing part 11 is made Simplified further, since simply inserting the centering membrane 22 and the membrane 21 connected to it and the voice coil 19 means that the two last-mentioned components are already precisely positioned at the distance 18 between the magnet pot 12 and the pole core 14.

In die Schalldurchtrittsöffnung 27 ist zentrisch ein akustischer Equalizer 30 angeordnet und durch Stege 31 mit dem Rand der Öffnung 27 verbunden.An acoustic equalizer 30 is arranged centrally in the sound passage opening 27 and connected to the edge of the opening 27 by webs 31.

Der Gehäuserand 24, welcher einen Teil der äußeren Mantelfläche des Magnettopfes 12 ummantelt, weist an seiner Mantelfläche eine Mehrzahl von federnd ausgebildeten Schnapper 32 auf. Diese werden, wie Figur 3 verdeutlicht, jeweils durch zwei parallele und in Richtung zum Deckel 26 verlaufende Schlitze 33 gebildet. Das freie Ende 34 dieser Schnapper 32 ist mit Rasthaken 35 versehen. Sobald der Magnettopf 12 in Richtung der Öffnung 27 in das bereits mit der Zentriermembran 22, der Membran 21 und der Schwingspule 19 bestückte Gehäuseteil 11 eingedrückt wird, bewirkt der an der Außenfläche des Magnettopfes 12 angeordnete Kragen 25, daß die Schnapper 32 in Pfeilrichtung elastisch ausweichen. Da der Abstand zwischen den freien Ende 29 des Rohrstücks 28 und der dem Deckel 26 zugewandten Bereich der Rasthaken 35 der Dicke des Kragens 25 entspricht, schnappen die Schnapper 32 entgegen der Pfeilrichtung in ihre Ausgangsstellung zurück, sobald der Rand 23 des Magnettopfes 12 an dem freien Ende 29 des Rohrstücks 28 anliegt. Gleichzeitig greifen dabei die Rasthaken 35 den Kragen 25 und verbinden somit beide Bauteile miteinander. Das Verbinden des Magnettopfes 12 mit dem Gehäuseteil 11 wird vereinfacht, wenn der Kragen 25 sowie die Rasthaken 35 eine leicht abgerundete und in Figur 1 dargestellte Formgebung aufweisen.The housing edge 24, which surrounds part of the outer lateral surface of the magnetic pot 12, has a plurality of spring-shaped catches 32 on its lateral surface. As illustrated in FIG. 3, these are each represented by two parallel and in the direction of the cover 26 extending slots 33 formed. The free end 34 of this catch 32 is provided with locking hooks 35. As soon as the magnetic pot 12 is pressed in the direction of the opening 27 into the housing part 11 which is already equipped with the centering membrane 22, the membrane 21 and the voice coil 19, the collar 25 arranged on the outer surface of the magnetic pot 12 causes the catches 32 to deflect elastically in the direction of the arrow . Since the distance between the free end 29 of the tube piece 28 and the area of the latching hook 35 facing the cover 26 corresponds to the thickness of the collar 25, the catches 32 snap back into their starting position against the direction of the arrow as soon as the edge 23 of the magnetic pot 12 on the free one End 29 of the pipe section 28 abuts. At the same time, the locking hooks 35 grip the collar 25 and thus connect the two components to one another. The connection of the magnetic pot 12 to the housing part 11 is simplified if the collar 25 and the locking hooks 35 have a slightly rounded shape and shown in FIG. 1.

Sollte die innere Mantelfläche des Gehäuserandes 24 zur Führung des Magnettopfes beim Verbinden der beiden Bauteile noch nicht ausreichend sein, sind - wie in Figur 2 veranschaulicht - am Kragen 25 sowie an der inneren Mantelfläche des Gehäuserandes 24 längs zur Mittelachse des Lautsprechers 10 geeignete Fügehilfen 36 anzuordnen. Die in Figur 2 veranschaulichten Fügehilfen 36 sind nur beispielhaft. Werden jedoch Fügehilfen 36 vorgesehen, ist der Magnettopf 12 im Gehäuseteil 11 auch in Radialrichtung lagefixiert.If the inner lateral surface of the housing edge 24 for guiding the magnetic pot when connecting the two components is not yet sufficient, suitable joining aids 36 must be arranged on the collar 25 and on the inner lateral surface of the housing edge 24 along the central axis of the loudspeaker 10, as illustrated in FIG. 2 . The joining aids 36 illustrated in FIG. 2 are only examples. However, if joining aids 36 are provided, the magnet pot 12 is also fixed in position in the radial direction in the housing part 11.

Schließlich bleibt nachzutragen, daß bei der figürlichen Darstellung des Lautsprechers 10 auf eine Darstellung der Kontaktierung der Schwingspulen verzichtet wurde.Finally, it must be added that in the figurative representation of the loudspeaker 10, the contacting of the voice coils has not been shown.

Claims (1)

  1. Dome-type high-frequency loudspeaker (10),
    - with a magnet pot (12)
    - with a pole core (14),
    - which is formed from an upper pole plate (15) and a highly-energized disc (17) arranged between the upper pole plate (15) and the base (16) of the magnet pot (12), and
    - which pole core (14) is arranged centrally in the magnet pot at a distance (18) from the inner face of the magnet pot (12),
    - with a one-piece diaphragm (21),
    - whose central area is of approximately hemispherical construction, and
    - whose edge zone is constructed as a spider (22),
    - with a voice coil (19),
    - which is placed in the transition area between the spider (22) and the central area of the diaphragm (21), and
    - which projects with its free end into the gap (18) between the inner face of the magnet pot (12) and the pole core (14), and
    - with a one-piece housing part (11),
    - which covers the central part of the diaphragm (21) and the spider (22),
    - which one-piece housing part (11) has an acoustic equalizer (30) in the region of the hemispherical form of the diaphragm (21), and
    - which one-piece housing part (11) is joined to the magnet pot (12),
    characterised in that
    - the diameter of the voice coil (19) is < 19 mm,
    - the housing part (11) is exclusively joined to the magnet pot (12) by means of sprung catches (32) arranged at the edge (24) of the housing part, the sprung catches (32) encircling with their moulded-in locking hooks (35) a collar (25) arranged at the outer face of the magnet pot (12),
    - after the locking of the magnet pot (12) and the housing part (11), the one-piece diaphragm (21) is exclusively fixed in position between the housing part (11) and the magnet pot (12) so that the part of the diaphragm (21) which rests upon the magnet pot (12) is pressed onto the magnet pot (12) by means of the free end (29) of the tubular piece (28) arranged on the housing part (11), and
    - assembly aids (36) are arranged at the outer face of the magnet pot (12) and at the inner face of the housing part (11) in each area where both components overlap.
EP91114500A 1990-10-06 1991-08-29 Dome-shaped high-frequency loudspeaker Expired - Lifetime EP0480160B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4031742 1990-10-06
DE4031742A DE4031742A1 (en) 1990-10-06 1990-10-06 CALOTH HIGH TONE SPEAKER

Publications (3)

Publication Number Publication Date
EP0480160A2 EP0480160A2 (en) 1992-04-15
EP0480160A3 EP0480160A3 (en) 1993-01-13
EP0480160B1 true EP0480160B1 (en) 1995-07-26

Family

ID=6415769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114500A Expired - Lifetime EP0480160B1 (en) 1990-10-06 1991-08-29 Dome-shaped high-frequency loudspeaker

Country Status (4)

Country Link
US (1) US5150419A (en)
EP (1) EP0480160B1 (en)
JP (1) JPH04264900A (en)
DE (2) DE4031742A1 (en)

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Also Published As

Publication number Publication date
EP0480160A2 (en) 1992-04-15
US5150419A (en) 1992-09-22
JPH04264900A (en) 1992-09-21
DE59106080D1 (en) 1995-08-31
DE4031742A1 (en) 1992-04-09
EP0480160A3 (en) 1993-01-13

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