EP1086606B1 - Panel loudspeakers - Google Patents

Panel loudspeakers Download PDF

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Publication number
EP1086606B1
EP1086606B1 EP99924965A EP99924965A EP1086606B1 EP 1086606 B1 EP1086606 B1 EP 1086606B1 EP 99924965 A EP99924965 A EP 99924965A EP 99924965 A EP99924965 A EP 99924965A EP 1086606 B1 EP1086606 B1 EP 1086606B1
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EP
European Patent Office
Prior art keywords
panel
borders
width
centre
gravity
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Revoked
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EP99924965A
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German (de)
French (fr)
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EP1086606A1 (en
Inventor
Wolfgang Bachmann
Gerhard Krump
Hans-Jürgen Regl
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Harman Becker Automotive Systems GmbH
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Harman Audio Electronic Systems GmbH
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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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • 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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers

Definitions

  • the invention relates to so-called plate speakers, which according to the Bending shaft principle work, especially on the positioning of the drivers on Panel loudspeaker.
  • plate loudspeakers which according to Bending shaft principle work.
  • Such arrangements are essentially formed by a panel and at least one drive system, the Panel is vibrated when the drive system (s) electrical audio frequency signals are supplied.
  • Characteristic of such Sound reproducing devices is that from a lower cut-off frequency, the so-called critical frequency a "bending wave radiation" is possible, the bending waves in the plane of the respective panel to a Lead sound radiation with frequency-dependent direction.
  • a section through a created directional diagram shows a main lobe, the Direction is frequency dependent.
  • the panel of the panel loudspeaker is constructed according to the sandwich principle, in that preferably two opposing surfaces of a light core layer are each connected to a cover layer that is thin compared to the core layer, for example by gluing.
  • the material for the cover layer must have a particularly high expansion wave speed.
  • Suitable cover layer materials are, for example, thin metal foils or fiber-reinforced plastic foils. Special requirements are also placed on the core layer, because this layer must above all have a particularly low density (for example 20 to 30 kg / m 3) .
  • the core layer should be able to absorb high shear stresses normal to the cover layers.
  • the modulus of elasticity in the direction normal to the cover layers must be sufficiently large, while a very low modulus of elasticity does not interfere parallel to the cover layers.
  • the core layer can show anisotropic or isotropic behavior.
  • honeycombs made of light metal alloys or resin-impregnated fiber-reinforced papers (anisotropic) and rigid foams (isotropic) have proven themselves as ultra-light core layer structures.
  • the panels are driven by drivers that -as shown in DE-A-197 57 097- either placed on the respective panel or integrated into it.
  • the drivers are approximately in the form of electrodynamic shakers or piezoelectric bending vibration disks as Drive elements predominantly in the center or close to the edge be attached, although from the consideration of individual, undisturbed Vibration modes of rectangular panels appear to make more sense in other places could.
  • the difficulty lies in optimizing the excitation position considering the driver feedback, considering many, but especially the low-frequency fashions and taking into account the acoustic contributions of each vibration mode in each considered Modal frequency.
  • One solution would be modeling using the finite element method combined with a numerical solution to the acoustic Field equations and with a stochastic variation of the boundary conditions and exact positions in the range of realistic tolerances.
  • Another solution would exist in the practical testing of ready-made record speakers random driver positions. Both conceivable solution methods are very consuming.
  • WO97 / 09842 describes a procedure with which suitable points for mounting drivers on a panel can be determined. However, they are based on this Places determined in particular when using fixed in panels clamped in a frame as disadvantageous proved. In addition, the known procedure offers only a small selection of attachment points, so that the Applications are very limited overall.
  • the invention is therefore based on the object of positioning areas for drivers to specify which driver, based on the area of the panel without large Effort and can be placed with high efficiency.
  • the positioning range extends between one Edge zone, which is directly adjacent to the edges of the panel in the direction of the Focus panels and a focus zone, which is around extends the center of gravity of the panel, there is a high yield in the available vibration modes are reached and at the same time become unfavorable Point impedances avoided.
  • the Width B of the edge zone must be at least 5% of the diagonals of the panel, um to reduce the point impedances.
  • a particularly sustainable reduction occurs of the fixed clamping when the width B of the edge zone has values of takes about 10% of the diagonals of the panel.
  • the center of gravity should have a diameter D of have at least 20% of the diagonal of the panel. Smaller diameter values lead to a disproportionate exclusion of vibration modes for the Drive the panel.
  • the panel on compliant elements with the frame connected, the center of gravity should be cruciform because the areas immediately adjacent to those through the centers of the edges and the Connect the center of gravity of the panel running side bisectors as not have proven suitable for the positioning of drivers.
  • the Reductions can be designed as specified in claim 5.
  • the panel does not have a square, but an elongated one Shape, the width should be for different long edges of the panel be different.
  • width B1 of the edge zone, which runs along the long edges of the panel is greater than the width B2 of the Edge zone, which runs along the short edges.
  • the width B1 should be at least 10% and B2 be at least 5% of the diagonal of the panel.
  • the parallel to the long Edge areas of the panel-running surface areas have a width 3.1 of 2.5% or greater and parallel to the short edges of the panels extending surface areas a width 3.2 greater than or equal to 17% of the Have diagonals of the panel.
  • the distance A1 about 7% and the distance A2 about 14% of the diagonals of the panel.
  • FIG. 1 is a plan view, not to scale, of a Record speakers 10 shown.
  • This plate speaker 10 is in essentially of a panel 11 in sandwich construction, two drivers 12 and a Ralunen 13 formed. Since the panel 11 in the present Embodiment is elongated, edges are of different lengths 14 available, namely the long edges 14.l and the short edges 14.k.
  • the Panel 11 is rigidly connected to the ralune 13 at its edges 14.
  • the Drivers 12 are integrated in the panels 11 and are therefore only indicated in FIG. 1.
  • Positioning area for drivers is identified by reference numeral 15.
  • This positioning area 15, which is dotted for better illustration, extends between an edge zone 16 which is directly adjacent to the edges 14 connects and has a width B, and a center of gravity 17 with a Diameter D1.
  • Under focus zone 17 is related to this application understood the area of the panel 11, the focus S of the panel 11 surrounds.
  • the edge zone 16 which in the present exemplary embodiment is uniform Width B of 10% of the diagonal D of the panel 11 can be in another - Not shown- embodiment for the different lengths of edges 14.l, 14.k be of different widths. But even in this case, the Edge zone 16 has the greatest possible width B in order to achieve point impedances excluded.
  • the focus zone 17 in the present case has a diameter D1 of 25% Diagonals D of the panel 11. To as many vibration modes for the To use the drive of the panel 11, the focus zone 17 should also be chosen as large as possible.
  • Fig. 2 is another embodiment for an optimal Positioning area 15 (15.1 to 15.4) shown.
  • the panel 11 on its edges 14.l, 14.k by means of elastic elements 18th connected to the frame 13. Only for the sake of completeness noted that the type of connection between frame 13 and panel 11 not much influence for the optimal positioning of the driver 12 on the Panel 11 has, so that those shown in the embodiment of FIG. 1 Ratios largely also for plate speakers 10 according to Fig.2 and apply in reverse.
  • the edge zone 16 does not have a uniform width B. Rather, they are edge zones 16 with the width running parallel to the long edges 14.l. B1 wider than the edge zones 16 running parallel to the short edges 14.k. with the width B2.
  • the dependence of the different widths B1, B2 on the size The panel 11 is given by the fact that the width B1 is approximately 16% and the width B2 is approximately 6.3% of the diagonal D of the panel 11.
  • the width B3 (B3.1, B3.2) of both surface strips 17 ', 17 " is of different sizes in order to still have a reasonably large processing area 15 for to get the drivers 12.
  • 14.k is the width B3.2 of the area strip 17 ', which runs parallel to the long edge 14.l, 2.9% and the width B3.1 of the other area strip 17 "17.4% of the diagonals D of the panel 11.
  • Two sides of each reduction 20 are used by the Inner edges 21 of the edge zone 16 are formed.
  • the third pages of the triangular reductions 20 lie on a line 22, which - as shown in Fig. 2 - connects the centers M of all edges 14 together.
  • the distance A1 between the driver 12 and the center line is M '6.9% and the distance A2 between driver 12 and center line M "14% of the Diagonals D of the panel 11.
  • Driver 12 meet the distance requirements to the center lines M ', M ", the conditions in another - not shown - embodiment not be fulfilled for all drivers 12.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Description

Technisches GebietTechnical field

Die Erfindung bezieht sich auf sogenannte Plattenlautsprecher, die nach dem Biegewellenprinzip arbeiten, insbesondere auf die Positionierung der Treiber am Plattenlautsprecher.The invention relates to so-called plate speakers, which according to the Bending shaft principle work, especially on the positioning of the drivers on Panel loudspeaker.

Stand der TechnikState of the art

Gemäß dem Stand der Technik sind Plattenlautsprecher bekannt, die nach dem Biegewellenprinzip arbeiten. Derartige Anordnungen werden im wesentlichen von einem Paneel und wenigstens einem Antriebssystem gebildet, wobei das Paneel in Schwingungen versetzt wird, wenn dem oder den Antriebssystem(en) elektrische Tonfrequenzsignale zugeführt werden. Charakteristisch für solche Schallwiedergabeanordnungen ist, daß ab einer unteren Grenzfrequenz, der sogenannten kritischen Frequenz eine "Biegewellenabstrahlung" möglich wird, wobei die Biegewellen in der Ebene des jeweiligen Paneels zu einer Schallabstrahlung mit frequenzabhängiger Richtung führen. Mit anderen Worten, ein Schnitt durch ein erstelltes Richtdiagramm zeigt eine Hauptkeule, deren Richtung frequenzabhängig ist. Diese Verhältnisse sind für unendlich ausgedehnte Platten und Absorberplatten vollständig gültig, während die Verhältnisse für die in dieser Anmeldung behandelten Multiresonanzplatten (auch Distributed Mode Loudspeaker genannt) wegen der starken Randreflexe dann deutlich komplexer sind. Diese Komplexität bei Multiresonanzplatten rührt daher, daß die genannte Hauptkeule mit frequenzabhängiger Richtung von einer Mehrzahl weiterer solcher Hauptkeulen überlagert wird, so daß ein stark aufgefächertes Richtdiagramm entsteht, welches außerdem sehr frequenzabhängig ist. Typisches Kennzeichen der hier behandelten Multiresonanzplatten ist, daß ihre Richtdiagramme im Mittel eher von der Mittelsenkrechten wegweisen. Dieses Verhalten bewirkt, daß der Raum stärker in die Projektion der Schallwellen einbezogen wird.According to the prior art, plate loudspeakers are known, which according to Bending shaft principle work. Such arrangements are essentially formed by a panel and at least one drive system, the Panel is vibrated when the drive system (s) electrical audio frequency signals are supplied. Characteristic of such Sound reproducing devices is that from a lower cut-off frequency, the so-called critical frequency a "bending wave radiation" is possible, the bending waves in the plane of the respective panel to a Lead sound radiation with frequency-dependent direction. In other words, a section through a created directional diagram shows a main lobe, the Direction is frequency dependent. These relationships are infinite extended plates and absorber plates are fully valid during the Ratios for the multi-resonance plates treated in this application (also Distributed Mode Loudspeaker) because of the strong edge reflections are significantly more complex. This complexity with multi-resonance plates comes from that said main lobe with frequency-dependent direction of one A plurality of other such main lobes is superimposed, making a strong fanned pattern, which is also very frequency-dependent is. A typical characteristic of the multi-resonance plates discussed here is that their average directional diagrams tend to point away from the perpendicular. This behavior causes the space to project more into the Sound waves is included.

Das Paneel des Plattenlautsprechers ist nach dem Sandwich-Prinzip aufgebaut, indem vorzugsweise zwei einander gegenüberliegende Oberflächen einer sellr leichten Kemschicht mit jeweils einer im Vergleich zur Kernschicht dünnen Deckschicht beispielsweise durch Verklebung verbunden sind. Damit der Plattenlautsprecher gute Schallwiedergabeeigenschaften aufweist, muß das Material für die Deckschicht eine besonders hohe Dehnwellengeschwindigkeit haben. Geeignete Deckschichtmaterialien sind beispielsweise dünne Metallfolien oder auch faserverstärkte Kunststoffolien. Auch an die Kernschicht werden besondere Anfordeningen gestellt, denn diese Schicht muß vor allem eine besonders geringe Dichte (z.B. 20 bis 30 kg/m3) aufweisen. Weiterhin soll die Kernschicht hohe Schubspannungen normal zu den Deckschichten aufnehmen können. Dazu muß letztlich der Elastizitätsmodul in Richtung normal zu den Deckschichten ausreichend groß sein, während parallel zu den Deckschichten auch ein sehr geringer E-Modul nicht stört. Insofern kann die Kernschicht anisotropes oder auch isotropes Verhalten zeige. Als ultraleichte Kernschichtstrukturen haben sich beispielsweise Waben aus Leichtmetall-Legierungen oder harzgetränkte faserverstärkte Papiere (anisotrop) und Hartschäume (isotrop) bewährt.The panel of the panel loudspeaker is constructed according to the sandwich principle, in that preferably two opposing surfaces of a light core layer are each connected to a cover layer that is thin compared to the core layer, for example by gluing. In order for the record speaker to have good sound reproduction properties, the material for the cover layer must have a particularly high expansion wave speed. Suitable cover layer materials are, for example, thin metal foils or fiber-reinforced plastic foils. Special requirements are also placed on the core layer, because this layer must above all have a particularly low density (for example 20 to 30 kg / m 3) . Furthermore, the core layer should be able to absorb high shear stresses normal to the cover layers. Ultimately, the modulus of elasticity in the direction normal to the cover layers must be sufficiently large, while a very low modulus of elasticity does not interfere parallel to the cover layers. In this respect, the core layer can show anisotropic or isotropic behavior. For example, honeycombs made of light metal alloys or resin-impregnated fiber-reinforced papers (anisotropic) and rigid foams (isotropic) have proven themselves as ultra-light core layer structures.

Außerdem ist es aus DE-A-197 57 098 bekannt, daß Paneel mit einem Rahmen zu verbinden, welcher das Paneel aufnimmt und die Verbindung mit anderen Bauteilen ermöglicht. Je nach Ausbildung kann dieser Rahmen auch von einer Einbauwand, in welcher das Paneel integriert werden soll, gebildet sein. Die Verbindung zwischen dem Paneel und dem Ralunen ist in der Regel als elastische Verbindung ausgelegt, welche auf das schwingenden Paneel keinen oder nur einen sehr geringen Widerstand ausübt. Auch sind harte Verbindungen bekannt, bei welchen die Paneel starr mit den Rahmen verbunden sind.It is also known from DE-A-197 57 098 that panel with a frame to connect, which picks up the panel and connect with others Components enabled. Depending on the training, this framework can also be of one Built-in wall in which the panel is to be integrated. The Connection between the panel and the ralune is usually as elastic Connection designed, which no or only on the vibrating panel has very little resistance. Hard connections are also known in which the panel is rigidly connected to the frame.

Der Antrieb der Paneele erfolgt mittels Treibern, die
-wie in DE-A-197 57 097 gezeigt- entweder am jeweilige Paneel aufgesetzt oder in diesem integriert sind.The panels are driven by drivers that
-as shown in DE-A-197 57 097- either placed on the respective panel or integrated into it.

Außerdem ist es bekannt, daß die Treiber etwa in der Form von elektrodynamischen Shakern oder piezoelektrischen Biegeschwingerscheiben als Antriebselemente vorwiegend im Zentrum oder aber in enger Randnähe angebracht werden, obwohl aus der Betrachtung einzelner, ungestörter Schwingungsmoden von Rechteckplatten andere Orte sinnvoller erscheinen könnten. Die Schwierigkeit besteht in der Optimierung der Anregungsposition unter Berücksichtigung der Treiberrückwirkung, unter Berücksichtigung vieler, aber vor allem der tieffrequenten Moden und unter Berücksichtigung der akustischen Beiträge jedes Schwingungsmodes bei jeder betrachteten Modalfrequenz. Eine Lösung bestünde in der Modelliening nach der Finite-Elemente-Methodik kombiniert mit einer numerischen Lösung der akustischen Feldgleichungen und mit einer stochastischen Variation der Randbedingungen und exakten Positionen im Bereich realistischer Toleranzen. Eine andere Lösung bestünde im praktischen Erproben fertig gebauter Plattenlautsprecher mit zufälligen Treiberpositionen. Beide denkbare Lösungsverfahren sind sehr aufwendig. It is also known that the drivers are approximately in the form of electrodynamic shakers or piezoelectric bending vibration disks as Drive elements predominantly in the center or close to the edge be attached, although from the consideration of individual, undisturbed Vibration modes of rectangular panels appear to make more sense in other places could. The difficulty lies in optimizing the excitation position considering the driver feedback, considering many, but especially the low-frequency fashions and taking into account the acoustic contributions of each vibration mode in each considered Modal frequency. One solution would be modeling using the finite element method combined with a numerical solution to the acoustic Field equations and with a stochastic variation of the boundary conditions and exact positions in the range of realistic tolerances. Another solution would exist in the practical testing of ready-made record speakers random driver positions. Both conceivable solution methods are very consuming.

In der WO97/09842 ist eine Vorgehensweise beschrieben, mit der geeignete Punkte zur Anbringung von Treibern auf einem Paneel ermittelt werden können. Allerdings haben sich die auf diese Weise ermittelten Orte insbesondere bei Verwendung von fest in einem Rahmen eingespannten Paneelen als unvorteilhaft erwiesen. Darüber hinaus bietet die bekannte Vorgehensweise nur eine geringe Auswahl an Anbringungspunkten, so dass die Anwendungsmöglichkeiten insgesamt sehr beschränkt sind. WO97 / 09842 describes a procedure with which suitable points for mounting drivers on a panel can be determined. However, they are based on this Places determined in particular when using fixed in panels clamped in a frame as disadvantageous proved. In addition, the known procedure offers only a small selection of attachment points, so that the Applications are very limited overall.

Daher liegt der Erfindung die Aufgabe zugrunde, Positionierbereiche für Treiber anzugeben, an welchen Treiber bezogen auf die Fläche des Paneels ohne großen Aufwand und aber mit hoher Effizienz plazierbar sind.The invention is therefore based on the object of positioning areas for drivers to specify which driver, based on the area of the panel without large Effort and can be placed with high efficiency.

Darstellung der ErfindungPresentation of the invention

Diese Aufgabe wird mit den in den Anspruch 1 angegeben Merkmalen gelöst. Vorteilhafte Aus- und Weiterbildungen der Erfindung sind den Ansprüchen 2 bis 12 entnehmbar.This object is achieved with the features specified in claim 1. Advantageous further developments of the invention are claims 2 to 12 removable.

Erstreckt sich gemäß Anspruch 1 der Positionierbereich zwischen einer Randzone, die sich unmittelbar an die Ränder des Paneel in Richtung des Schwerpunkt Paneels anschließt, und einer Schwerpunktzone, welche sich um den Schwerpunkt des Paneels erstreckt, wird eine hohe Ausbeute bei den verfügbaren Schwingungsmoden erreicht und gleichzeitig werden ungünstige Punktimpedanzen vermieden.According to claim 1, the positioning range extends between one Edge zone, which is directly adjacent to the edges of the panel in the direction of the Focus panels and a focus zone, which is around extends the center of gravity of the panel, there is a high yield in the available vibration modes are reached and at the same time become unfavorable Point impedances avoided.

Ist gemäß Anspruch 2 das Paneel fest in einem Rahmen eingespannt, sollte die Breite B der Randzone mindestens 5% der Diagonalen des Paneels betragen, um die Punktimpedanzen zu mindern. Eine besonders nachhaltige Minderung tritt bei der festen Einspannung dann ein, wenn die Breite B der Randzone Werte von etwa 10% der Diagonalen des Paneels annimmt. Zur Erhöhung der Ausbeute der Schwingungsmoden, sollte die Schwerpunktzone einen Durchmesser D von mindestens 20% der Diagonalen des Paneels haben. Kleinere Durchmesserwerte führen zu einem überproportionalen Ausschluß von Schwingungsmoden für den Antrieb des Paneels.If, according to claim 2, the panel is firmly clamped in a frame, the Width B of the edge zone must be at least 5% of the diagonals of the panel, um to reduce the point impedances. A particularly sustainable reduction occurs of the fixed clamping when the width B of the edge zone has values of takes about 10% of the diagonals of the panel. To increase the yield of the Vibration modes, the center of gravity should have a diameter D of have at least 20% of the diagonal of the panel. Smaller diameter values lead to a disproportionate exclusion of vibration modes for the Drive the panel.

Ist gemäß Anspruch 3 das Paneel über nachgiebige Elemente mit dem Rahmen verbunden, sollte die Schwerpunktzone kreuzförmig ausgebildet sein, weil sich die Bereiche, welche unmittelbar an die durch die Mitten der Ränder und den Schwerpunkt des Paneels verlaufenden Seitenhalbierenden anschließen, als nicht für die Positionierung von Treibern geeignet erwiesen haben.Is according to claim 3, the panel on compliant elements with the frame connected, the center of gravity should be cruciform because the areas immediately adjacent to those through the centers of the edges and the Connect the center of gravity of the panel running side bisectors as not have proven suitable for the positioning of drivers.

Wird gemäß Anspruch 3 die Schwerpunktzone kreuzförmig ausgebildet, ergeben sich vier Positionierbereiche. Um den Einfluß der Ränder des Paneels auf diese Positionierbereiche zu verringern, sollte gemäß Anspruch 4 diese in den Bereichen, in welchen jeweils zwei Ränder des Paneels eine Ecke bilden, eine Verkleinerung aufweisen.If the center of gravity is cross-shaped according to claim 3, result four positioning ranges. The influence of the edges of the panel on them To reduce positioning ranges, should this in the Areas in which two edges of the panel form a corner, one Show reduction.

Um dem Einfluß der Ecken des Paneels vollständig auszuschließen, sollten die Verkleinerungen so wie in Anspruch 5 angegeben ausgestaltet sein. To completely exclude the influence of the corners of the panel, the Reductions can be designed as specified in claim 5.

Hat gemäß Anspruch 6 das Paneel keine quadratische, sondern eine längliche Form, sollte die Breite für unterschiedliche lange Ränder des Paneels unterschiedlich sein.According to claim 6, the panel does not have a square, but an elongated one Shape, the width should be for different long edges of the panel be different.

Dies bedeutet gemäß Anspruch 7, daß die Breite B1 der Randzone, welche entlang der langen Ränder des Paneels verläuft, größer ist als die Breite B2 der Randzone, welche entlang der kurzen Ränder verläuft.This means according to claim 7 that the width B1 of the edge zone, which runs along the long edges of the panel, is greater than the width B2 of the Edge zone, which runs along the short edges.

Dabei sollte gemäß Anspruch 8 die Breite B1 mindestens 10% und B2 mindestens 5% der Diagonalen des Paneels betragen.According to claim 8, the width B1 should be at least 10% and B2 be at least 5% of the diagonal of the panel.

Um die schon beschriebenen Nachteile auszuschließen bzw. um dennoch einen relativ großen Positionierbereich zu erhalten, ist es gemäß Anspruch 9 nicht notwendig, daß die Flächenbereiche, weiche die kreuzförmige Schwerpunktzone bilden, die gleiche Breite haben.In order to rule out the disadvantages already described, or to avoid one to obtain relatively large positioning range, it is not according to claim 9 necessary that the surface areas give way to the cruciform zone of focus form, have the same width.

Vielmehr ist es gemäß Anspruch 10 ausreichend, wenn die parallel zu den langen Rändern des Paneels verlaufenden Flächenbereiche eine Breite 3.1 von größer/gleich 2,5% und die parallel zu den kurzen Rändern der Paneels verlaufenden Flächenbereiche eine Breite 3.2 von größer/gleich 17% der Diagonalen des Paneels haben.Rather, it is sufficient if the parallel to the long Edge areas of the panel-running surface areas have a width 3.1 of 2.5% or greater and parallel to the short edges of the panels extending surface areas a width 3.2 greater than or equal to 17% of the Have diagonals of the panel.

Ein optimaler Positionierbereich für Treiber ist gemäß Anspruch 11 dann gegeben, wenn die Treiber zu der parallel zu den langen Ränder des Paneels verlaufenden Mittellinie M' einen Abstand A1 und zu der parallel zu den kurzen Ränder des Paneels verlaufenden Mittellinie M" einen Abstand A2 haben.An optimal positioning range for drivers is then according to claim 11 given when the drivers are parallel to the long edges of the panel running center line M 'a distance A1 and parallel to the short Edges of the panel-extending center line M "have a distance A2.

Bezogen auf die Größe des Paneels sollte gemäß Anspruch 1 der Abstand A1 etwa 7% und der Abstand A2 etwa 14% der Diagonalen des Paneels betragen.Based on the size of the panel, the distance A1 about 7% and the distance A2 about 14% of the diagonals of the panel.

Kurze Darstellung der FigurenBrief presentation of the figures

Es zeigen:

Fig. 1
eine Draufsicht auf einen Plattenlautsprecher; und
Fig. 2
eine weitere Darstellung gemäß Fig. 2.
Show it:
Fig. 1
a plan view of a plate speaker; and
Fig. 2
another representation according to FIG. 2nd

Wege zum Ausführen der ErfindungWays of Carrying Out the Invention

Die Erfindung soll nun anhand der Figuren näher erläutert werden.The invention will now be explained in more detail with reference to the figures.

In Figur 1 ist eine nicht maßstabsgerechte Draufsicht auf einen Plattenlautsprecher 10 gezeigt. Dieser Plattenlautsprecher 10 wird im wesentlichen von einem Paneel 11 in Sandwich-Bauweise, zwei Treibern 12 und einem Ralunen 13 gebildet. Da das Paneel 11 im vorliegenden Ausführungsbeispiel länglich ausgebildet ist, sind unterschiedlich lange Ränder 14 vorhanden, und zwar die langen Ränder 14.l und die kurzen Ränder 14.k. Das Paneel 11 ist an seinen Rändern 14 mit dem Ralunen 13 starr verbunden. Die Treiber 12 sind im Paneels 11 integriert und daher in Fig. 1 nur angedeutet.In Figure 1 is a plan view, not to scale, of a Record speakers 10 shown. This plate speaker 10 is in essentially of a panel 11 in sandwich construction, two drivers 12 and a Ralunen 13 formed. Since the panel 11 in the present Embodiment is elongated, edges are of different lengths 14 available, namely the long edges 14.l and the short edges 14.k. The Panel 11 is rigidly connected to the ralune 13 at its edges 14. The Drivers 12 are integrated in the panels 11 and are therefore only indicated in FIG. 1.

Mit dem Bezugszeichen 15 ist Positionierbereich für Treiber gekennzeichnet. Dieser Positionierbereich 15, welcher zur besseren Darstellung punktiert ist, erstreckt sich zwischen einer Randzone 16, welche unmittelbar an die Ränder 14 anschließt und eine Breite B hat, und einer Schwerpunktzone 17 mit einem Durchmesser D1. Unter der Schwerpunktzone 17 wird im Zusammenhang mit dieser Anmeldung der Bereich des Paneels 11 verstanden, der den Schwerpunkt S des Paneels 11 umgibt.Positioning area for drivers is identified by reference numeral 15. This positioning area 15, which is dotted for better illustration, extends between an edge zone 16 which is directly adjacent to the edges 14 connects and has a width B, and a center of gravity 17 with a Diameter D1. Under focus zone 17 is related to this application understood the area of the panel 11, the focus S of the panel 11 surrounds.

Die Randzone 16, welche im vorliegen Ausführungsbeispiel eine einheitliche Breite B von 10% der Diagonalen D des Paneels 11 hat, kann in einem anderen - nicht dargestellten- Ausführungsbeispiel auch für die verschieden langen Ränder 14.l , 14.k unterschiedlich breit sein. Aber auch in diesem Falle gilt, daß die Randzone 16 eine möglichst große Breite B aufweist, um Punktimpedanzen auszuschließen.The edge zone 16, which in the present exemplary embodiment is uniform Width B of 10% of the diagonal D of the panel 11 can be in another - Not shown- embodiment for the different lengths of edges 14.l, 14.k be of different widths. But even in this case, the Edge zone 16 has the greatest possible width B in order to achieve point impedances excluded.

Die Schwerpunktzone 17 hat vorliegend einen Durchmesser D1 von 25% der Diagonalen D des Paneels 11. Um möglichst viele Schwingungsmoden für den Antrieb des Paneels 11 zu nutzen, sollte die Schwerpunktzone 17 ebenfalls möglichst groß gewählt werden.The focus zone 17 in the present case has a diameter D1 of 25% Diagonals D of the panel 11. To as many vibration modes for the To use the drive of the panel 11, the focus zone 17 should also be chosen as large as possible.

In Fig. 2 ist ein weiteres Ausführungsbeispiel für einen optimalen Positionierbereich 15 (15.1 bis 15.4) gezeigt. In diesem Ausführungsbeispiel ist das Paneel 11 an seine Rändern 14.l, 14.k mittels von elastischen Elementen 18 mit dem Rahmen 13 verbunden. Nur der Vollständigkeit halber sei darauf hingewiesen, daß die Art der Verbindung zwischen Rahmen 13 und Paneel 11 keinen großen Einfluß für die optimale Positionierung der Treiber 12 auf dem Paneel 11 hat, so daß die im Ausführungsbeispiel gemäß Fig. 1 gezeigten Verhältnisse weitgehend auch für Plattenlautsprecher 10 gemäß Fig.2 und umgekehrt gelten. In Fig. 2 is another embodiment for an optimal Positioning area 15 (15.1 to 15.4) shown. In this embodiment the panel 11 on its edges 14.l, 14.k by means of elastic elements 18th connected to the frame 13. Only for the sake of completeness noted that the type of connection between frame 13 and panel 11 not much influence for the optimal positioning of the driver 12 on the Panel 11 has, so that those shown in the embodiment of FIG. 1 Ratios largely also for plate speakers 10 according to Fig.2 and apply in reverse.

Gemäß Fig. 2 hat die Randzone 16 keine einheitliche Breite B. Vielmehr sind die parallel zu den langen Rändern 14.l verlaufenden Randzonen 16 mit der Breite B1 breiter als die parallel zu den kurzen Rändern 14.k verlaufende Randzonen 16 mit der Breite B2. Die Abhängigkeit der verschiedenen Breiten B1, B2 zur Größe des Paneels 11 ist dadurch gegeben, daß die Breite B1 etwa 16% und die Breite B2 etwa 6,3% der Diagonalen D des Paneels 11 beträgt.2, the edge zone 16 does not have a uniform width B. Rather, they are edge zones 16 with the width running parallel to the long edges 14.l. B1 wider than the edge zones 16 running parallel to the short edges 14.k. with the width B2. The dependence of the different widths B1, B2 on the size The panel 11 is given by the fact that the width B1 is approximately 16% and the width B2 is approximately 6.3% of the diagonal D of the panel 11.

Der Darstellung gemäß Fig. 2 ist entnehmbar, daß die Schwerpunktzone 17 kreuzförmig ausgebildet ist, indem zwei Flächenstreifen 17';17", welche jeweils parallel zu den Rändern 14 verlaufen und sich im Schwerpunkt S des Paneels 11 überkreuzen. Die Breite B3 (B3.1, B3.2) beider Flächenstreifen 17', 17" ist unterschiedlich groß, um noch einen vertretbar großen Prositionierbereich 15 für die Treiber 12 zu erhalten. Bezogen auf die Abmessungen des Paneels 11 bzw. mit Rücksicht auf die durch die längliche Ausgestaltung des Paneels 11 und der damit verbunden unterschiedlich langen Ränder 14.l, 14.k beträgt die Breite B3.2 des Flächenstreifens 17', welcher parallel zum langen Rand 14.l verläuft, 2,9% und die Breite B3.1 des anderen Flächenstreifens 17" 17,4% der Diagonalen D des Paneels 11.2 that the center of gravity zone 17th is cross-shaped by two surface strips 17 '; 17 ", each run parallel to the edges 14 and in the center of gravity S of the panel 11 cross. The width B3 (B3.1, B3.2) of both surface strips 17 ', 17 "is of different sizes in order to still have a reasonably large processing area 15 for to get the drivers 12. Based on the dimensions of the panel 11 or with regard to the elongated design of the panel 11 and the associated with it edges of different lengths 14.l, 14.k is the width B3.2 of the area strip 17 ', which runs parallel to the long edge 14.l, 2.9% and the width B3.1 of the other area strip 17 "17.4% of the diagonals D of the panel 11.

Durch die sich kreuzenden Flächenstreifen 17', 17" werden zusammen mit der Randzone 16 vier Positionierbereiche 15.1 -15.4 geschaffen, in denen Treiber 12 mit guten Resultaten plaziert werden können. Werden jedoch die Bereiche der grundsätzlichen Positionierbereiche 15.1 - 15.4 nahe den Ecken 19, in denen jeweils ein kurzer Rand 14.k mit einem langen Rand 14.l zusammentrifft, mit Treibern 12 versehen, wird die Biegewelleneinprägung in das Paneel 11 wegen der Nähe zur Ecke 19 erheblich verschlechtert. Deshalb ist jeder Positionierbereich 15.1-15.4 mit einer dreieckförmigen Verkleinerung 20 versehen. Jeweils zwei Seiten einer jeden Verkleinerung 20 werden von den Innenrändern 21 der Randzone 16 gebildet. Die dritten Seiten der dreieckförmigen Verkleinerungen 20 liegen auf einen Linienzug 22, welcher -wie in Fig. 2 gezeigt- die Mitten M sämtlicher Ränder 14 miteinander verbindet. Um diese Verhältnisse besser darzustellen, sind die um die Verkleinerungen 20 reduzierten Positionierbereiche 15.1 -15.4 in Fig. 2 ebenfalls punktiert dargestellt. Auch wenn die Positionierung von Treibern 12 in den punktierten Positionierbereichen schon als optimal angesehen werden kann, hat sich herausgestellt, daß die Anordnung von Treibern 12 in Bereichen der Positionierbereiche 15.1 -15.4, welche nahe den dem Schwerpunkt zugewandten Ecken 23 innerhalb der Positionierbereiche 15.1-15.4 liegen, eine nicht mehr übertreffbare Optimierung erreicht werden kann. Bezogen auf die Geometrie des Paneels 11 bedeutet dies, daß die Bereiche innerhalb der Positionierbereiche 15.1 - 15.2 zu den sich im Schwerpunkt S schneidenden und i.ü. parallel zu den langen und kurzen Rändern 14.l, 14.k verlaufenden Mittellinien M', M" einen verschieden großen Abstand A1, A2 einhalten. Im in Fig. 2 gezeigten Ausführungsbeispiel beträgt der Abstand A1 zwischen Treiber 12 und Mittellinie M' 6.9% und der Abstand A2 zwischen Treiber 12 und Mittellinie M" 14% der Diagonalen D des Paneels 11. Auch wenn im Ausführungsbeispiel sämtliche Treiber 12 die Abstandsbedingungen zu den Mittellinien M', M" erfüllen, müssen die Bedingungen in einem anderen -nicht gezeigten- Ausführungsbeispiel nicht für alle Treiber 12 erfüllt sein. So kann es beispielsweise ausreichend sein, wenn nur zwei der Treiber 12 die Abstandsbedingungen erfüllen und die anderen Treiber 12 innerhalb der punktierten Positionierbereiche 15.1 - 15.4 angeordnet sind. Auch ist es nicht notwendig, daß sämtliche Treiber 12 symmetrisch zueinander innerhalb der Positionierbereiche 15.1 - 15.4 ausgerichtet sind.The intersecting surface strips 17 ', 17 "together with the Edge zone 16 created four positioning areas 15.1 -15.4, in which driver 12 can be placed with good results. However, the areas of basic positioning areas 15.1 - 15.4 near the corners 19, in which a short edge 14.k meets a long edge 14.l, with Provided drivers 12, the bending wave impression in the panel 11 because close to corner 19 deteriorated significantly. That's why everyone is Positioning range 15.1-15.4 with a triangular reduction 20 Mistake. Two sides of each reduction 20 are used by the Inner edges 21 of the edge zone 16 are formed. The third pages of the triangular reductions 20 lie on a line 22, which - as shown in Fig. 2 - connects the centers M of all edges 14 together. Around to illustrate these relationships better are those around the reductions 20 reduced positioning areas 15.1 -15.4 in Fig. 2 also shown dotted. Even if the positioning of drivers 12 in the dotted Positioning areas can already be viewed as optimal pointed out that the arrangement of drivers 12 in areas of Positioning areas 15.1 -15.4, which are close to those facing the center of gravity Corners 23 lie within the positioning areas 15.1-15.4, one no longer surpassable optimization can be achieved. Based on the geometry of the Panel 11 means that the areas within the positioning areas 15.1 - 15.2 on the intersecting in the focus S and i.ü. parallel to the long and short edges 14.l, 14.k extending center lines M ', M "a Keep different distances A1, A2. In the shown in Fig. 2 In the exemplary embodiment, the distance A1 between the driver 12 and the center line is M '6.9% and the distance A2 between driver 12 and center line M "14% of the Diagonals D of the panel 11. Even if all in the exemplary embodiment Driver 12 meet the distance requirements to the center lines M ', M ", the conditions in another - not shown - embodiment not be fulfilled for all drivers 12. For example, it may be sufficient if only two of the drivers 12 meet the clearance requirements and the others Driver 12 arranged within the dotted positioning areas 15.1 - 15.4 are. It is also not necessary for all drivers 12 to be symmetrical are aligned with each other within the positioning ranges 15.1 - 15.4.

Claims (12)

  1. Panel loudspeaker with
       a panel (11) featuring borders (14, 14.l, 14.k) and a centre of gravity (S) and
       with a frame (13), which is connected to the panel (11), and
       at least one driver (12) connected to the panel (11),
       characterised by
       a border area (16), which immediately adjoins the borders (14, 14.l, 14.k) of the panel (11), which extends towards the centre of gravity (S) and the width (B) of which amounts to at least 5% of the diagonals (D) of the panel (11),
       a centre-of-gravity area (17) extending around the centre of gravity (S) with a diameter (D1) which amounts to at least 25% of the diagonals (D) of the panel (11), and
       a positioning region (15, 15.1 - 15.4), which extends between the centre-of-gravity area (17) and border area (16) and in which the driver or drivers (12) is or are exclusively arranged.
  2. Panel loudspeaker according to Claim 1,
       characterised in that
       the panel (11) is clamped firmly in a frame (13).
  3. Panel loudspeaker according to Claim 1,
       characterised in that
       the panel (11) is connected to the frame (13) via resilient elements (18),
       the centre-of-gravity area (17) is a cross-shaped surface area and is formed by two strip-shaped surfaces (17', 17"), running through the centre of gravity (S) of the panel (11), arranged at right angles to each other and joining up the border area (16) by the shortest route.
  4. Panel loudspeaker according to Claim 3,
       characterised in that,
       close to the regions in which two borders (14.l, 14.k) of the panel (11) in each case form a corner (19), the four positioning regions (15.1 to 15.4) produced by the cross-shaped design of the centre-of-gravity area (17, 17', 17") have a reduction (20).
  5. Panel loudspeaker according to Claim 4,
       characterised in that
       the reductions (20) of the positioning regions (15.1 to 15.4) are of triangular design, two sides of triangular reduction (20) being formed by the inner borders (21) of the border area (16) and the remaining side of the triangular reductions (20) lying on a continuous line (22), which connects the centres (M) of the borders (14, 14.l, 14.k).
  6. Panel loudspeaker according to one of Claims 2 to 5,
       characterised in that
       the panel (11) is of rectangular design, in each case two borders (14.l, 14.k) of the panel (11) which form a corner (19) having a different length, and in that the width (B) of the border areas (16) differs in the case of different borders (14.l, 14.k) of the panel (11).
  7. Panel loudspeaker according to Claim 6,
       characterised in that
       a first width (B1) of the border area (16) which adjoins the long borders (14.1) of the panel (11) is greater than a second width (B2) of the border area (16) which adjoins the short borders (14.k) of the panel (11).
  8. Panel loudspeaker according to Claim 7,
       characterised in that
       the first width (B1) corresponds to at least 10% and the second width (B2) at least 5% of the diagonals (D) of the panel (11).
  9. Panel loudspeaker according to one of Claims 3 to 8,
       characterised in that
       the two intersecting surface areas (17', 17") have a different width (B3).
  10. Panel loudspeaker according to one of Claims 6 to 8,
       characterised in that
       the two intersecting surface areas (17', 17") have a different width (B3), the surface area (17') running parallel to the long borders (14.1) of the panel (11) having a width (3.1) greater than/equal to 2.5% and the surface area (17'') running parallel to the short borders (14.k) of the panel (11) having a width (3.2) greater than/equal to 17% of the diagonals (D) of the panel (11).
  11. Panel loudspeaker according to one of Claims 6 to 10,
       characterised in that
       the drivers (12) each maintain a spacing with respect to the centre lines (M', M"), which intersect at the centre of gravity (S) and otherwise run parallel to the long and short borders (14.l, 14.k), a first spacing (A1) specifying the spacing of the drivers (12) with respect to the centre line (M') running parallel to the long border (14.l) and a second spacing (A2) specifying the spacing of the drivers (12) with respect to the centre line (M") running parallel to the short border (14.k), and in that
       the first spacing (A1) is smaller than the second spacing (A2).
  12. Panel loudspeaker according to Claim 11,
       characterised in that
       the first spacing (A1) amounts to about 7% and the second spacing (A2) about 14% of the diagonals (D) of the panel (11).
EP99924965A 1998-06-10 1999-05-14 Panel loudspeakers Revoked EP1086606B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19825866A DE19825866A1 (en) 1998-06-10 1998-06-10 Record speakers
DE19825866 1998-06-10
PCT/EP1999/003307 WO1999065273A1 (en) 1998-06-10 1999-05-14 Panel loudspeakers

Publications (2)

Publication Number Publication Date
EP1086606A1 EP1086606A1 (en) 2001-03-28
EP1086606B1 true EP1086606B1 (en) 2002-04-10

Family

ID=7870481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99924965A Revoked EP1086606B1 (en) 1998-06-10 1999-05-14 Panel loudspeakers

Country Status (5)

Country Link
US (1) US6836552B1 (en)
EP (1) EP1086606B1 (en)
JP (1) JP2002518910A (en)
DE (2) DE19825866A1 (en)
WO (1) WO1999065273A1 (en)

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Also Published As

Publication number Publication date
DE19825866A1 (en) 1999-12-16
EP1086606A1 (en) 2001-03-28
US6836552B1 (en) 2004-12-28
WO1999065273A1 (en) 1999-12-16
JP2002518910A (en) 2002-06-25
DE59901200D1 (en) 2002-05-16

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