EP1142445B1 - Low-frequency diaphragm speaker - Google Patents

Low-frequency diaphragm speaker Download PDF

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Publication number
EP1142445B1
EP1142445B1 EP99967891A EP99967891A EP1142445B1 EP 1142445 B1 EP1142445 B1 EP 1142445B1 EP 99967891 A EP99967891 A EP 99967891A EP 99967891 A EP99967891 A EP 99967891A EP 1142445 B1 EP1142445 B1 EP 1142445B1
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EP
European Patent Office
Prior art keywords
diaphragm
type bass
bass loudspeaker
opening
housing
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Expired - Lifetime
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EP99967891A
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German (de)
French (fr)
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EP1142445A2 (en
Inventor
Norbert Schäfer
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Zuern Joachim
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Zuern Joachim
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Publication of EP1142445A2 publication Critical patent/EP1142445A2/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • 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

Definitions

  • the invention relates to a low-frequency diaphragm speaker Conversion of electrical to acoustic signals.
  • the invention relates to a low-frequency diaphragm speaker with a converter of electrical in mechanical vibrations connected to a membrane, which converts the mechanical vibrations into sound.
  • the housing In a known, often used in practice Low-frequency membrane speaker with a generator of electromagnetic Vibrations connected to a membrane, which the electromagnetic vibrations in sound converted, the housing is a closed airtight Box, with the help of which the back-emitted wavefront the membrane is prevented from using the Front of the membrane radiated meet. at In these closed housings, the air in the housing brakes the Forward and backward movement of the membrane, thereby increasing the resonance frequency of the speaker system. ever smaller the air volume of a closed housing, the higher the spring action of the enclosed air and thus the resonance frequency.
  • a disadvantage of the well-known low-frequency diaphragm speakers is that a good sound or a good reproduction over a large frequency range and especially in the range very small Frequencies, i.e. in the low frequency range, only with large membranes can be generated, because only with these it is possible to create deep To produce sounds.
  • the large membrane becomes one relatively small housing built in, low tones are not emitted because the air cushion on the back of the Membrane slows the movement of the membrane. For this reason the housing of the low-frequency diaphragm speaker must be very be chosen large volume.
  • Another known low-frequency diaphragm speaker has a loudspeaker base body that is enclosed by a closed Housing is surrounded, which on its back pressure equalization openings contains (DE 19601217 C1, EP-0456416 A2). These openings reduce the air cushion stiffness of the membrane and facilitate membrane work through pressure equalization, so the case is a bit smaller for good playback can be chosen as when fully closed Housings.
  • these low-frequency diaphragm speakers low tones are not emitted because the opening in the Range of low frequencies to the rear sound opposed to low air resistance. For this reason the system works in the lower frequency range as if no housing available, i.e. the rear sound extinguishes the sound on the front of the membrane in the area of this low notes.
  • a precisely defined opening in the housing connected with tunnels or channels or a passive membrane leaves the rear Sound to the outside.
  • the opening acts as a pure pressure compensation opening or in certain frequency ranges as Sound amplifiers.
  • the rear sound extinguishes the front sound in certain frequency ranges not more, but reinforces the same.
  • not only vibratable Objects, but also air-filled cavities Have resonance.
  • Known low-frequency diaphragm speakers are special efficient in its resonance range. In the event of a response they are Vibrations of the amplifier, i.e. the vibrations of the enforcing system and the vibrations of the coil and so that the membrane is in phase with normal stroke. The Amplifiers and the restoring force of the membrane act in the same direction. The area around the resonance frequency is consequently reproduced very loudly.
  • the resonance frequency the well-known low-frequency diaphragm speaker is in Working range of the speaker, and thus between 15 Hz and 200 Hz. A lifelike reproduction of tones in The resonance frequency range is without additional means not possible with it. To the resonance range too control, is known to try this Resonance area with elaborate electronic aids to monitor.
  • Sensors and circuits are used, that recognize and report the position of the membrane, so that with suitable electronic control circuits Volume of the resonance frequency range can be regulated can.
  • Known sensors are capacitive or inductive Displacement sensors or light barriers, in which for example a the wedge attached to the membrane.
  • a low-frequency diaphragm loudspeaker according to the preamble of claim 1 is for example, known from US-A-3767005. Additional low-frequency diaphragm speakers are from US-A-4481662 and GB-A-2206262 known.
  • the object of the invention is to provide the best possible low-frequency diaphragm speaker specify.
  • the low-frequency membrane speaker according to the invention Claim 1 has the advantage that the tones of the bass range especially between 30 Hz and the lower hearing limit of 16 Hz not extinguished, but as pure sinusoidal Sounds can be played. Because the resonance frequency completely outside the working area of the speaker is a volume distortion, as in the state of the Technology in the field of resonance frequency is inevitable locked out. The midrange or treble range located resonance frequency allows the entire Low frequency range corresponding to the electrical supply Signal to be transmitted almost error-free.
  • the basic body which acts as a very small housing, is reduced the air cushion size on the back of the membrane.
  • the resonance frequency of the system is advantageously increased. It is particularly favorable to increase the size of the base body choose that the resonance frequency is still in the transmission range of the system, but above the work area lies.
  • the sound from the rear is also advantageous the membrane directly the small opening in the base body or feed in the housing in relation to The sound-emitting membrane acts as a very small membrane. So the sound pressure with the small stroke becomes the desired one Useful sound emitting membrane on the small, rear Opening transformed into noise, which with a large stroke and high speed of movement emerges from the opening and noticeable as an acoustically not disturbing air flow makes. It was found that the volume of this at the Air leakage approx.
  • the low-frequency membrane speaker according to the invention which is the resonance frequency from the work area removed, monitoring is advantageously of the resonance range is not required. costly electronic monitoring circuits can omitted.
  • the low-frequency diaphragm speaker according to the invention characterized in that it is upstream
  • a linear amplifier across the entire working range Represents impedance without significant deviation.
  • the Reinforcement is real, almost without imaginary part, because the Impedance of the coil only above the working area affects, i.e. the speaker provides for the amplifier approximately represents a purely ohmic load much simpler amplifier technology possible, because a electronically very complex technology to compensate for Voltage and resistance fluctuations can be eliminated.
  • the low-frequency diaphragm speaker becomes an open body used, which is inserted into a small housing.
  • the opening is integrated in the housing.
  • the Operation of this embodiment of the low-frequency diaphragm speaker otherwise corresponds to the above mentioned.
  • the design of the low-frequency diaphragm speaker with housing can simplify Opening to be formed by a cutting gap.
  • the Cutting edge is preferably made of metal, but can also be made of an easy to manufacture plastic molded part or made of other suitable materials and will be manufactured with the housing e.g. by screwing, jamming etc. connected. It is particularly advantageous that through this Training if necessary a fine adjustment after the Assembly of the low-frequency diaphragm speaker is possible.
  • the cutting edge allows the depth of the opening desirable to keep small.
  • the opening in a thin-walled sheet for example, for example, hole or slot.
  • a further embodiment of the low-frequency diaphragm loudspeaker is also provided before, this opening as conical or opening gradually decreasing from the inside to the outside to be provided in the housing or base body, which on the Inside of the case has a large area and to the outside towards an opening with a very small area.
  • the efficiency of the low-frequency diaphragm speaker can also a layer of insulation in front of the rear wall of the speaker can be set.
  • the loudspeaker can be manufactured be manufactured particularly easily if that Housing at the end of the assembly with an elbow is closed off in a cutting leg-ending, that avoids the opening.
  • the layer of insulation can entire rear area in the housing before opening to complete. However, it is also possible to use insulation material in front of the opening and / or on the rear wall of the housing to arrange.
  • the low-frequency diaphragm speaker 1 has a housing-like Base body 2 and one lying on its front side, very much bendable suspended plate membrane 3 with a vibration drive 4 located on its rear side operate.
  • a permanent magnet 6 provided at the back of the base plate 5, opposite this, completely non-contact.
  • a bottom plate 7 At the back of the permanent magnet 6 is attached a bottom plate 7, the circumference of which is greater than the outer circumference of the permanent magnet 6.
  • a ring or rectangular Sheath 8 arranged between the protruding bottom plate 7 and the base plate 5 is as Magnetic flux conductor around the magnet 6 a ring or rectangular Sheath 8 arranged.
  • Connecting parts 9, 16 attached a housing 10 such that its front edges 11 in one plane with the front 12 close off the plate membrane 3 or slightly above protrude.
  • this space 18 is in suitably, e.g. by gluing, using an angle piece 20 one of its two legs 21 on the rear wall 13 attached.
  • the second leg 22 of the angle piece 20 closes the housing 10 except for a small gap 23, which forms an opening, with the leg 22 on it Inside towards the opening 23 in a long, flat Sloping 24 runs out.
  • Fig. 2 is a low-frequency diaphragm speaker 1.2 shown, the eight speakers according to FIG. 1 in is composed of a block. From its the housing (10.2) represent the basic body is the upper side wall 14 and the side wall 15.2 detect. The side wall 15.2 is made up of eight side walls 15 1 assembled. In the side wall 15.2 are according to the number of individual speakers 1.1 eight slots 23 are present.
  • the low-frequency diaphragm speaker 1.2 has a height 27 of 1692 mm (millimeters), one Width 28 of 222 mm and a depth 29 of preferably between 30 and 100 mm, in this case 70 mm.
  • the membrane area is 97% (percent) of Front of the woofer diaphragm speaker 1.2.
  • This Front of the speaker covering the baffle of the Loudspeaker consists of 100% loudspeaker chassis.
  • Insulating material 26.3 is in this embodiment only before Step-like, tapered, gap-shaped Opening 23.3 arranged. Insulation material 26 respectively 26.3 can also on the inside of the rear wall 13 and on the side wall 14.3 opposite opening 23.3 be arranged.
  • Insulation material 26 respectively 26.3 can also on the inside of the rear wall 13 and on the side wall 14.3 opposite opening 23.3 be arranged.
  • U-shaped connecting parts 9, 16 according to FIG. 1 have been replaced through appropriately profiled side walls 15.3, 14.3.
  • the opening 23.3 has a length 30 of a little less than 210 mm.
  • the system dimension 31 of the individual is 210 mm Speaker 1.1 in a block of eight speakers composite speakers 1.2. Touch this way the individual slot-shaped openings 23.3 do not each other.
  • the inner width 32 of the step stepped opening 23.3 is present Example case 18 mm.
  • the front width, visible from the outside 34 of this opening 23.3 is between 5 and 15 mm, in present example 8 mm.
  • the front step thickness 36 is 2 mm.
  • the side wall 15.3 has an overall thickness 38 of 5 mm. Such a thin one from here Example of aluminum existing side wall is in the Low-frequency diaphragm speakers 1.1, 1.2, 1.3 possible because the Eigen-resonance frequencies above the working frequencies of the Bass speaker.

Abstract

A diaphragm-type bass loudspeaker has a housing (10), the housing walls (13, 14, 15) of which enclose a volume (25) which is formed on the rear side of its diaphragm (3). In a surface area of the housing walls (13, 14, 15) which bounds the volume (25) there is an opening (23). The volume (25) is so small that the resonant frequency at which the oscillations of the amplifier correspond to the oscillations of the diaphragm (3) in terms of magnitude lies above 200 Hz (Hertz), in particular above 1000 Hz (Hertz), and is consequently in the frequency range of a mid-frequency or treble loudspeaker. At the same time, the opening (23) is formed such that, at every frequency of the diaphragm-type bass loudspeaker, air emerges from the volume at a great velocity.

Description

Die Erfindung betrifft einen Tiefton-Membranlautsprecher zur Umwandlung von elektrischen in akustische Signale.The invention relates to a low-frequency diaphragm speaker Conversion of electrical to acoustic signals.

Insbesondere betrifft die Erfindung einen Tiefton-Membranlautsprecher mit einem Wandler von elektrischen in mechanische Schwingungen verbunden mit einer Membran, welche die mechanischen Schwingungen in Schall umwandelt.In particular, the invention relates to a low-frequency diaphragm speaker with a converter of electrical in mechanical vibrations connected to a membrane, which converts the mechanical vibrations into sound.

Bei einem bekannten, in der Praxis häufig verwendeten Tiefton-Membran-Lautsprecher mit einem Erzeuger von elektromagnetischen Schwingungen verbunden mit einer Membran, welche die elektromagnetischen Schwingungen in Schall umwandelt, ist das Gehäuse ein geschlossener luftdichter Kasten, mit dessen Hilfe die rückwärtig abgestrahlte Wellenfront der Membran daran gehindert wird, mit der an der Frontseite der Membran abgestrahlten zusammenzutreffen. Bei diesen geschlossenen Gehäusen bremst die Luft im Gehäuse die Vorwärts- und Rückwärtsbewegung der Membran, dadurch erhöht sich die Resonanzfrequenz des Lautsprechersystems. Je kleiner das Luftvolumen eines geschlossenen Gehäuses ist, desto höher ist die Federwirkung der eingeschlossenen Luft und damit die Resonanzfrequenz.In a known, often used in practice Low-frequency membrane speaker with a generator of electromagnetic Vibrations connected to a membrane, which the electromagnetic vibrations in sound converted, the housing is a closed airtight Box, with the help of which the back-emitted wavefront the membrane is prevented from using the Front of the membrane radiated meet. at In these closed housings, the air in the housing brakes the Forward and backward movement of the membrane, thereby increasing the resonance frequency of the speaker system. ever smaller the air volume of a closed housing, the higher the spring action of the enclosed air and thus the resonance frequency.

Ungünstig an den bekannten Tiefton-Membranlautsprechern ist, dass ein guter Klang bzw. eine gute Wiedergabe über einen großen Frequenzbereich und vor allem im Bereich sehr kleiner Frequenzen, d.h. im Tieftonbereich, nur mit großen Membranen erzeugbar ist, denn nur mit diesen ist es möglich, tiefe Töne zu produzieren. Wird die große Membran jedoch in ein relativ kleines Gehäuse eingebaut, werden tiefe Töne nicht abgestrahlt, weil das Luftpolster auf der Rückseite der Membran die Bewegung der Membran bremst. Aus diesem Grund muss das Gehäuse des Tiefton-Membranlautsprechers sehr großvolumig gewählt werden. Werden Lautsprecher im Konsumbereich verkauft und beim Endverbraucher eingesetzt, ist die maximale Größe der Lautsprecher jedoch begrenzt.A disadvantage of the well-known low-frequency diaphragm speakers is that a good sound or a good reproduction over a large frequency range and especially in the range very small Frequencies, i.e. in the low frequency range, only with large membranes can be generated, because only with these it is possible to create deep To produce sounds. However, the large membrane becomes one relatively small housing built in, low tones are not emitted because the air cushion on the back of the Membrane slows the movement of the membrane. For this reason the housing of the low-frequency diaphragm speaker must be very be chosen large volume. Are speakers in the Consumer area sold and used by end users, however, the maximum size of the speakers is limited.

Ein anderer bekannter Tiefton-Membranlautsprecher besitzt einen Lautsprecher-Grundkörper, der von einem geschlossenen Gehäuse umgeben ist, welches auf seiner Rückseite Druckausgleichsöffnungen enthält (DE 19601217 C1, EP-0456416 A2) . Diese Öffnungen verringern die Luftpolstersteife der Membran und erleichtern durch den Druckausgleich die Membranarbeit, so dass für eine gute Wiedergabe die Gehäuse etwas kleiner gewählt werden können, als bei vollständig geschlossenen Gehäusen. Allerdings werden bei diesen Tiefton-Membranlautsprechern tiefe Töne nicht abgestrahlt, da die Öffnung im Bereich der tiefen Frequenzen dem rückwärtigen Schall einen zu geringen Luftwiderstand entgegensetzt. Aus diesem Grunde arbeitet das System im unteren Frequenzbereich, als wäre kein Gehäuse vorhanden, d.h. der rückwärtige Schall löscht den Schall auf der Vorderseite der Membran im Bereich dieser tiefen Töne aus.Another known low-frequency diaphragm speaker has a loudspeaker base body that is enclosed by a closed Housing is surrounded, which on its back pressure equalization openings contains (DE 19601217 C1, EP-0456416 A2). These openings reduce the air cushion stiffness of the membrane and facilitate membrane work through pressure equalization, so the case is a bit smaller for good playback can be chosen as when fully closed Housings. However, these low-frequency diaphragm speakers low tones are not emitted because the opening in the Range of low frequencies to the rear sound opposed to low air resistance. For this reason the system works in the lower frequency range as if no housing available, i.e. the rear sound extinguishes the sound on the front of the membrane in the area of this low notes.

Bei einem weiteren bekannten Tiefton-Membranlautsprecher wird der an der Rückseite der Membran abgestrahlte Schall nicht eliminiert, sondern teilweise nutzbar gemacht. Eine genau definierte Öffnung im Gehäuse verbunden mit Tunneln oder Kanälen oder einer Passivmembran lässt den rückwärtigen Schall nach außen. Die Öffnung wirkt als reine Druckausgleichsöffnung oder in bestimmten Frequenzbereichen als Schallverstärker. Der rückwärtige Schall löscht den vorderseitigen Schall in bestimmten Frequenzbereichen nicht mehr aus, sondern verstärkt denselben. In diesem Fall wird der Effekt genutzt, dass nicht nur schwingfähige Gegenstände, sondern auch luftgefüllte Hohlräume eine Resonanz haben. Durch eine Veränderung des Gehäusevolumens oder der schalldurchlässigen Öffnung bzw. der Passivmembran lässt sich diese Hohlraumresonanz beeinflussen. Der rückwärtige Schall gelangt verstärkt nach außen und ergibt zusammen mit dem Schall von der Vorderseite der Membran eine hohe Schallabstrahlung.In another known low-frequency diaphragm speaker becomes the sound emitted at the back of the membrane not eliminated, but partially made usable. A precisely defined opening in the housing connected with tunnels or channels or a passive membrane leaves the rear Sound to the outside. The opening acts as a pure pressure compensation opening or in certain frequency ranges as Sound amplifiers. The rear sound extinguishes the front sound in certain frequency ranges not more, but reinforces the same. In this case exploited the effect that not only vibratable Objects, but also air-filled cavities Have resonance. By changing the housing volume or the sound-permeable opening or the passive membrane this cavity resonance can be influenced. The rearward sound escapes and results along with the sound from the front of the membrane high sound radiation.

Bei diesen Tiefton-Membranlautsprechern wird eine optimale Wirkung allerdings nur dann erzielt, wenn Gehäusevolumen, die Resonanzfrequenz der Membran im Gehäuse und die Abmessungen der Reflexöffnung bzw. der Passivmembran sehr genau aufeinander abgestimmt sind. Darüber bleibt nachteilig vorhanden, dass auch bei diesen Tiefton-Membranlautsprechern tiefe Töne nicht abgestrahlt werden können, da die Öffnung im Bereich der tiefen Frequenzen dem rückwärtigen Schall keinen oder nur einen geringen Luftwiderstand entgegensetzt. Dies führt wiederum dazu, dass die den tiefen Frequenzen entsprechenden Druckwellen der Luft ungehindert durch die Öffnung treten können. Aus diesem Grunde arbeitet dieses System im unteren Frequenzbereich, als wäre kein Gehäuse vorhanden, d.h. der hinter der Membran entstehende, rückwärtige Schall löscht den vor der Membran entstehenden Schall im Bereich dieser tiefen Töne aus.With these low-frequency diaphragm speakers, an optimal Effect only achieved, however, if the housing volume, the resonance frequency of the membrane in the housing and the Dimensions of the reflex opening or the passive membrane very much are precisely coordinated. This remains disadvantageous available that even with these low-frequency diaphragm speakers low tones cannot be emitted because of the opening in the range of the low frequencies the rear sound opposes little or no air resistance. This in turn leads to the low frequencies corresponding air pressure waves unhindered by the Opening. This is why this works System in the lower frequency range, as if there were no housing available, i.e. the emerging behind the membrane backward sound clears the emerging in front of the membrane Sound out in the range of these low tones.

Musik bzw. Töne allgemein sind ein Gemisch aus verschiedenen Frequenzen. Es wird daher mit jedem Lautsprecher eine möglichst naturgetreue Wiedergabe dieser Töne angestrebt. Voraussetzung hierfür ist, dass alle momentan gespielten Frequenzen rein sinusförmig und in der richtigen Lautstärke wiedergegeben werden. Music or tones in general are a mixture of different ones Frequencies. It is therefore one with each speaker aim to reproduce these tones as lifelike as possible. The prerequisite for this is that all currently played Frequencies purely sinusoidal and at the right volume are reproduced.

Bekannte Tiefton-Membranlautsprecher sind besonders effizient in ihrem Resonanzbereich. Im Resonanzfall sind die Schwingungen des Verstärkers, d.h. die Schwingungen des erzwingenden Systems und die Schwingungen der Spule und damit der Membran bei normalem Hub gleichphasig. Der Verstärker und die Rückstellkraft der Membran wirken in die gleiche Richtung. Der Bereich um die Resonanzfrequenz wird infolgedessen sehr laut wiedergegeben. Die Resonanzfrequenz der bekannten Tiefton-Membranlautsprecher liegt im Arbeitsbereich des Lautsprechers, und damit zwischen 15 Hz und 200 Hz. Eine naturgetreue Wiedergabe von Tönen im Bereich der Resonanzfrequenz ist ohne zusätzliche Mittel damit nicht möglich. Um den Resonanzbereich zu kontrollieren, wird bekanntermaßen versucht, diesen Resonanzbereich mit aufwendigen elektronischen Hilfsmitteln zu überwachen. Zum Einsatz kommen Sensoren und Schaltungen, die die Lage der Membran erkennen und rückmelden, so dass mit geeigneten elektronischen Steuerschaltungen die Lautstärke des Resonanzfrequenzbereichs geregelt werden kann. Bekannte Sensoren sind kapazitive oder induktive Wegaufnehmer oder Lichtschranken, in die zum Beispiel ein an der Membran angebrachter Keil eintaucht.Known low-frequency diaphragm speakers are special efficient in its resonance range. In the event of a response they are Vibrations of the amplifier, i.e. the vibrations of the enforcing system and the vibrations of the coil and so that the membrane is in phase with normal stroke. The Amplifiers and the restoring force of the membrane act in the same direction. The area around the resonance frequency is consequently reproduced very loudly. The resonance frequency the well-known low-frequency diaphragm speaker is in Working range of the speaker, and thus between 15 Hz and 200 Hz. A lifelike reproduction of tones in The resonance frequency range is without additional means not possible with it. To the resonance range too control, is known to try this Resonance area with elaborate electronic aids to monitor. Sensors and circuits are used, that recognize and report the position of the membrane, so that with suitable electronic control circuits Volume of the resonance frequency range can be regulated can. Known sensors are capacitive or inductive Displacement sensors or light barriers, in which for example a the wedge attached to the membrane.

Als nachteilig hat sich bei herkömmlichen Tiefton-Membranlautsprechern herausgestellt, dass eine aufwendige Verstärkertechnik notwendig ist, um den Lautsprecher anzusteuern. Vom Verstärker her gesehen bilden diese eine sehr stark induktive Impedanz mit Wirk- und Blindanteil. Dadurch schwankt die Impedanz über den Wiedergabebereich zwischen ca. 2 und 80 Ω. Darüber hinaus wirkt der Lautsprecher als Spannungsgenerator, der Gegenspannungen an den Verstärker abgibt, die gegenphasig zur Spannung des Verstärkers wirken. Aus diesem Grund ist für den Verstärker eine elektronisch sehr aufwendige Technik notwendig, um die Spannungs- und Widerstandsschwankungen vom Lautsprecher annähernd zu kompensieren.Has proven to be a disadvantage with conventional low-frequency diaphragm speakers turned out to be an elaborate Amplifier technology is necessary to the speaker head for. Seen from the amplifier, these form one very strong inductive impedance with active and reactive components. As a result, the impedance fluctuates over the playback range between approx. 2 and 80 Ω. In addition, the Loudspeaker as a voltage generator, the counter voltages outputs the amplifier, which is in phase opposition to the voltage of the Amplifier. For this reason it is for the amplifier an electronically very complex technology is necessary in order to Voltage and resistance fluctuations from the speaker almost compensate.

Ein Tiefton-Membranlautsprecher gemäß dem Oberbegriff des Anspruchs 1 ist, beispielsweise, aus der US-A- 3767005 bekannt. Weitere Tiefton-Membranlautsprecher sind aus der US-A-4481662 und der GB-A-2206262 bekannt.A low-frequency diaphragm loudspeaker according to the preamble of claim 1 is for example, known from US-A-3767005. Additional low-frequency diaphragm speakers are from US-A-4481662 and GB-A-2206262 known.

Aufgabe der Erfindung ist es, einen möglichst guten Tiefton-Membranlautsprecher anzugeben.The object of the invention is to provide the best possible low-frequency diaphragm speaker specify.

Die Lösung dieser Aufgabe wird gemäß den Merkmalen des Anspruchs 1 definiert. Dabei wird der eingangs aufgeführte Tiefton-Membranlautsprecher derart ausgebildet, dass der rückwärtige Schall durch eine sehr kleine Öffnung im Grundkörper des Lautsprechers in nicht störenden, beispielsweise etwa um den Faktor 100 leiseren Störschall überführt wird. Erfindungsgemäß wird auch der Grundkörper beziehungsweise das Gehäuse des Lautsprechers klein gehalten, um die Resonanzfrequenz entsprechend hoch anzusiedeln.The solution to this problem is defined according to the features of claim 1. This is the beginning low-frequency diaphragm loudspeakers designed in such a way that the rear sound through a very small opening in the base of the loudspeaker in non-disturbing, for example, noise that is quieter by a factor of 100 is transferred. According to the invention, the base body is also or the case of the speaker is small kept high according to the resonance frequency to settle.

Der erfindungsgemäße Tiefton-Membranlautsprecher gemäß Anspruch 1 hat den Vorteil, dass die Töne des Tieftonbereiches besonders zwischen 30 Hz und der unteren Hörgrenze von 16 Hz nicht ausgelöscht, sondern als reine sinusförmige Töne wiedergegeben werden. Da die Resonanzfrequenz vollständig außerhalb des Arbeitsbereichs des Lautsprechers liegt, ist eine Lautstärkeverzerrung, wie sie im Stand der Technik im Bereich der Resonanzfrequenz unvermeidbar ist, ausgeschlossen. Die im Bereich des Mitteltons oder Hochtons befindliche Resonanzfrequenz ermöglicht es, den gesamten Tieftonbereich entsprechend dem speisenden elektrischen Signal nahezu fehlerfrei zu übertragen.The low-frequency membrane speaker according to the invention Claim 1 has the advantage that the tones of the bass range especially between 30 Hz and the lower hearing limit of 16 Hz not extinguished, but as pure sinusoidal Sounds can be played. Because the resonance frequency completely outside the working area of the speaker is a volume distortion, as in the state of the Technology in the field of resonance frequency is inevitable locked out. The midrange or treble range located resonance frequency allows the entire Low frequency range corresponding to the electrical supply Signal to be transmitted almost error-free.

Der als sehr kleines Gehäuse wirkende Grundkörper verringert die Luftpolstergröße auf der Rückseite der Membran. Dadurch wird vorteilhaft die Resonanzfrequenz des Systems erhöht. Besonders günstig ist es, die Größe des Grundkörpers so zu wählen, dass die Resonanzfrequenz zwar noch im Übertragungsbereich des Systems, jedoch oberhalb des Arbeitsbereichs liegt. Vorteilhaft ist ferner den Schall von der Rückseite der Membran unmittelbar der kleinen Öffnung im Grundkörper beziehungsweise im Gehäuse zuzuführen, die im Verhältnis zur Nutzschall abgebenden Membran als sehr kleine Membran wirkt. So wird der Schalldruck der mit kleinem Hub den gewünschten Nutzschall abgebenden Membran an der kleinen, rückwärtigen Öffnung in Störschall transformiert, der mit großem Hub und großer Bewegungsgeschwindigkeit aus der Öffnung austritt und sich als akustisch nicht störende Luftströmung bemerkbar macht. Es wurde gefunden, dass die Lautstärke dieser an der Öffnung austretenden Luft ca. um den Faktor 100 gegenüber der Lautstärke des Nutzschalls der Membran kleiner ist. Als besonders günstig hat sich ferner erwiesen, die Tiefe der Öffnung so klein zu wählen, dass darin kein oder nur ein vernachlässigbar kleines Luftvolumen vorhanden ist, das dem an der Öffnung anliegenden Schalldruck keinen nennenswerten Luftwiderstand entgegensetzt. Um harmonische Wellen zu erzeugen hat es sich als besonders günstig erwiesen, für die Flächenreduzieröffnung einen Mindestquerschnitt zu bestimmen.The basic body, which acts as a very small housing, is reduced the air cushion size on the back of the membrane. Thereby the resonance frequency of the system is advantageously increased. It is particularly favorable to increase the size of the base body choose that the resonance frequency is still in the transmission range of the system, but above the work area lies. The sound from the rear is also advantageous the membrane directly the small opening in the base body or feed in the housing in relation to The sound-emitting membrane acts as a very small membrane. So the sound pressure with the small stroke becomes the desired one Useful sound emitting membrane on the small, rear Opening transformed into noise, which with a large stroke and high speed of movement emerges from the opening and noticeable as an acoustically not disturbing air flow makes. It was found that the volume of this at the Air leakage approx. By a factor of 100 the volume of the useful sound of the membrane is lower. As the depth of the Choose opening so small that there is no or only one there is a negligible small volume of air that the No significant sound pressure at the opening Air resistance opposed. To create harmonic waves produce it has proven to be particularly convenient for Area reduction opening to a minimum cross section determine.

Durch den erfindungsgemäßen Tiefton-Membranlautsprecher, bei dem die Resonanzfrequenz aus dem Arbeitsbereich herausgenommen ist, ist vorteilhafterweise eine Überwachung des Resonanzbereichs nicht erforderlich. Aufwendige elektronische Überwachungsschaltungen können dadurch entfallen.By the low-frequency membrane speaker according to the invention which is the resonance frequency from the work area removed, monitoring is advantageously of the resonance range is not required. costly electronic monitoring circuits can omitted.

Ferner ist der erfindungsgemäße Tiefton-Membranlautsprecher dadurch gekennzeichnet, dass er für den vorgeschalteten Verstärker über den gesamten Arbeitsbereich eine lineare Impedanz ohne nennenswerte Abweichung darstellt. Die Verstärkung ist real, fast ohne Imaginäranteil, da sich die Impedanz der Spule erst oberhalb des Arbeitsbereichs auswirkt, d.h. der Lautsprecher stellt für den Verstärker annähernd eine rein ohmsche Last dar. Hierdurch ist eine wesentlich vereinfachte Verstärkertechnik möglich, da eine elektronisch sehr aufwendige Technik zur Kompensation von Spannungs- und Widerstandsschwankungen entfallen kann.Furthermore, the low-frequency diaphragm speaker according to the invention characterized in that it is upstream A linear amplifier across the entire working range Represents impedance without significant deviation. The Reinforcement is real, almost without imaginary part, because the Impedance of the coil only above the working area affects, i.e. the speaker provides for the amplifier approximately represents a purely ohmic load much simpler amplifier technology possible, because a electronically very complex technology to compensate for Voltage and resistance fluctuations can be eliminated.

In einer weiteren bevorzugten Ausführungsform des Tiefton-Membranlautsprechers wird ein offener Grundkörper eingesetzt, der in ein kleines Gehäuse eingesetzt ist. In diesem Fall ist die Öffnung in das Gehäuse integriert. Die Wirkungsweise dieser Ausführungsform des Tiefton-Membranlautsprechers entspricht ansonsten der oben genannten. Um die konstruktive Gestaltung des Tiefton-Membranlautsprechers mit Gehäuse zu vereinfachen, kann die Öffnung durch einen Schneidenspalt ausgebildet sein. Die Schneide besteht vorzugsweise aus Metall, kann jedoch auch aus einem einfach zu fertigenden Kunststoffspritzteil oder aus anderen geeigneten Werkstoffen hergestellt sein und wird mit dem Gehäuse z.B. durch Verschrauben, Verklemmen usw. verbunden. Besonders vorteilhaft ist es, dass durch diese Ausbildung gegebenenfalls eine Feinjustierung nach dem Zusammenbau des Tiefton-Membranlautsprechers möglich ist. Die Schneide ermöglicht es, die Tiefe der Öffnung wünschenswert klein zu halten.In a further preferred embodiment of the low-frequency diaphragm speaker becomes an open body used, which is inserted into a small housing. In In this case, the opening is integrated in the housing. The Operation of this embodiment of the low-frequency diaphragm speaker otherwise corresponds to the above mentioned. The design of the low-frequency diaphragm speaker with housing can simplify Opening to be formed by a cutting gap. The Cutting edge is preferably made of metal, but can also be made of an easy to manufacture plastic molded part or made of other suitable materials and will be manufactured with the housing e.g. by screwing, jamming etc. connected. It is particularly advantageous that through this Training if necessary a fine adjustment after the Assembly of the low-frequency diaphragm speaker is possible. The cutting edge allows the depth of the opening desirable to keep small.

Nach einer weiteren Ausführungsform kann die Öffnung in einem beispielsweise dünnwandigen Blech als, beispielsweise, Loch oder Schlitz ausgebildet sein.According to a further embodiment, the opening in a thin-walled sheet, for example, for example, hole or slot.

Ferner sieht eine weitere Ausgestaltung des Tiefton-Membranlautsprechers vor, diese Öffnung als konisch oder stufenförmig von innen nach außen sich verkleinernde Öffnung im Gehäuse oder Grundkörper vorzusehen, die an der Innenseite des Gehäuses eine große Fläche hat und nach außen hin in einer Öffnung mit sehr kleiner Fläche mündet. A further embodiment of the low-frequency diaphragm loudspeaker is also provided before, this opening as conical or opening gradually decreasing from the inside to the outside to be provided in the housing or base body, which on the Inside of the case has a large area and to the outside towards an opening with a very small area.

Der Wirkungsgrad des Tiefton-Membranlautsprechers kann mit einer Dämmstoffschicht vor der Rückwand des Lautsprechers eingestellt werden. Der Lautsprecher kann fertigungstechnisch besonders einfach hergestellt werden, wenn das Gehäuse am Schluss der Montage mit einem Winkelstück mit einem schneidenförmig endenden Schenkel verschlossen wird, der die Öffnung ausspart. Die Dämmstoffschicht kann den gesamten rückwärtigen Bereich im Gehäuse vor der Öffnung ausfüllen. Es ist allerdings auch möglich, Dämm-Material vor der Öffnung und/oder an der Rückwand des Gehäuses anzuordnen.The efficiency of the low-frequency diaphragm speaker can also a layer of insulation in front of the rear wall of the speaker can be set. The loudspeaker can be manufactured be manufactured particularly easily if that Housing at the end of the assembly with an elbow is closed off in a cutting leg-ending, that avoids the opening. The layer of insulation can entire rear area in the housing before opening to complete. However, it is also possible to use insulation material in front of the opening and / or on the rear wall of the housing to arrange.

Um den Wirkungsgrad des Tiefton-Membranlautsprechers zu erhöhen, hat es sich ferner als günstig erwiesen, die Membranfläche des Lautsprechers zu vergrößern. Es wurde gefunden, dass dies konstruktiv am vorteilhaftesten dadurch erreicht wird, dass mehrere Lautsprecher und damit mehrere Membranen zu einem Block zusammengeschaltet werden. Ein Ausführungsbeispiel dafür ist in der Zeichnung angegeben.To increase the efficiency of the low-frequency diaphragm speaker increase, it has also proven to be beneficial To enlarge the diaphragm area of the speaker. It was found that this is the most constructively advantageous is achieved that several speakers and therefore several Membranes can be connected to a block. On Exemplary embodiment for this is indicated in the drawing.

Die Erfindung wird anhand von in der Zeichnung dargestellten Ausführungsbeispielen nachfolgend näher erläutert und beschrieben. Es zeigen:

Fig. 1
eine Schnittzeichnung durch eine erste Ausführungsform eines erfindungsgemäßen Tiefton-Membranlautsprechers nach der Erfindung,
Fig. 2
eine perspektivische Ansicht einer zweiten Ausführungsform der Erfindung, mit einem Block aus acht zusammengebauten Tiefton-Membranlautsprechern nach Fig. 1,
Fig. 3
eine Darstellung ähnlich der von Fig. 1 für eine weitere Ausführungsform eines Tiefton-Membranlautsprechers nach der Erfindung,
Fig. 4
eine Schnittdarstellung durch die im Gehäuse nach Fig. 3 vorhandene Öffnung und
Fig. 5
eine Ansicht der Öffnung nach Fig. 2, 3.
The invention is explained and described in more detail below with reference to exemplary embodiments shown in the drawing. Show it:
Fig. 1
2 shows a sectional drawing through a first embodiment of a low-frequency diaphragm loudspeaker according to the invention,
Fig. 2
2 shows a perspective view of a second embodiment of the invention, with a block of eight assembled low-frequency diaphragm loudspeakers according to FIG. 1,
Fig. 3
1 for another embodiment of a low-frequency diaphragm loudspeaker according to the invention,
Fig. 4
a sectional view through the existing in the housing of FIG. 3 and
Fig. 5
a view of the opening of Fig. 2, 3rd

Der Tiefton-Membranlautsprecher 1 weist einen gehäuseartigen Grundkörper 2 und eine an dessen Vorderseite liegende, sehr biegeweich aufgehängte Plattenmembran 3 auf, die mit einem an ihrer Rückseite liegenden Schwingungsantrieb 4 zu betreiben ist. An der Rückseite der Grundplatte 5, gegenüber dieser, vollständig berührungsfrei, ist ein Permanentmagnet 6 vorgesehen. An der Rückseite des Permanentmagneten 6 ist eine Bodenplatte 7 befestigt, deren Umfang größer ist als der Außenumfang des Permanentmagneten 6. Zwischen der vorstehenden Bodenplatte 7 und der Grundplatte 5 ist als Magnetflussleiter um den Magneten 6 ein ring- oder rechteckförmiger Mantel 8 angeordnet. An der Grundplatte 5 ist mit Anschlussteilen 9, 16 ein Gehäuse 10 derart befestigt, dass seine Vorderkanten 11 in einer Ebene mit der Vorderseite 12 der Plattenmembran 3 abschließen bzw. etwas darüber hinausragen.The low-frequency diaphragm speaker 1 has a housing-like Base body 2 and one lying on its front side, very much bendable suspended plate membrane 3 with a vibration drive 4 located on its rear side operate. At the back of the base plate 5, opposite this, completely non-contact, is a permanent magnet 6 provided. At the back of the permanent magnet 6 is attached a bottom plate 7, the circumference of which is greater than the outer circumference of the permanent magnet 6. Between the protruding bottom plate 7 and the base plate 5 is as Magnetic flux conductor around the magnet 6 a ring or rectangular Sheath 8 arranged. On the base plate 5 is with Connecting parts 9, 16 attached a housing 10 such that its front edges 11 in one plane with the front 12 close off the plate membrane 3 or slightly above protrude.

Auf der Rückseite des Lautsprechers schließen die Gehäuseseitenwände 14, 15 zusammen mit der Rückwand 13 des Lautsprechers ein relativ kleines Volumen 25 ein. Dabei ist die Seitenwand 15 gegenüber den drei anderen Seiten 14 nach hinten verkürzt. An der verkürzten Seitenwand 15 ist mit dem U-förmigen Anschlussteil 16, mit dem auf der einen Seite die Seitenwand 15 an der Grundplatte 5 befestigt ist, auf der anderen Seite eine Trennwand 17 verbunden, die in einen großen Bereich des Gehäuses 10, in den vom Volumen 25 eingenommenen Innenraum hineinragt. Ein Raum 18 zwischen der Trennwand 17 und der Rückwand 13 des Lautsprechers ist mit Dämmstoff 26 gefüllt.On the back of the speaker close the Housing side walls 14, 15 together with the rear wall 13 of the Speaker a relatively small volume 25 a. It is the side wall 15 opposite the three other sides 14 after shortened at the back. On the shortened side wall 15 is with the U-shaped connecting part 16 with which on one side Side wall 15 is attached to the base plate 5 on the other side a partition 17 connected into one large area of the housing 10, in the volume 25 occupies the interior. A space 18 between the Partition 17 and the rear wall 13 of the speaker is with Insulation 26 filled.

Am nach außen offenen Ende 19 dieses Raumbereichs 18 ist in geeigneter Weise, z.B. durch Kleben, ein Winkelstück 20 mit einem seiner beiden Schenkel 21 an der Rückwand 13 befestigt. Der zweite Schenkel 22 des Winkelstücks 20 verschließt das Gehäuse 10 bis auf einen kleinen Spalt 23, der eine Öffnung bildet, wobei der Schenkel 22 auf seiner Innenseite zur Öffnung 23 hin in einer langen, flachen Schräge 24 ausläuft. Bei Schwingungsbewegungen der Membran 3 wird die Luft auf ihrer Rückseite durch die im Verhältnis zur Membranfläche sehr kleine Fläche des Schneidenspaltes 23 mit großer Geschwindigkeit hinausgeblasen.At the open end 19 of this space 18 is in suitably, e.g. by gluing, using an angle piece 20 one of its two legs 21 on the rear wall 13 attached. The second leg 22 of the angle piece 20 closes the housing 10 except for a small gap 23, which forms an opening, with the leg 22 on it Inside towards the opening 23 in a long, flat Sloping 24 runs out. When the membrane 3 vibrates is the air on their back by the proportion to the membrane area very small area of the cutting gap 23 blown out at great speed.

In Fig. 2 ist ein Tiefton-Membranlautsprecher 1.2 dargestellt, der aus acht Lautsprechern gemäß Fig. 1 in einem Block zusammengesetzt ist. Von seinem das Gehäuse (10.2) darstellen den Grundkörper ist die obere Seitenwand 14 und die Seitenwand 15.2 zu erkennen. Die Seitenwand 15.2 ist aus acht Seitenwänden 15 gemäß Fig. 1 zusammengesetzt ausgebildet. In der Seitenwand 15.2 sind entsprechend der Anzahl der einzelnen Lautsprecher 1.1 acht Schlitze 23 vorhanden. Der Tiefton-Membranlautsprecher 1.2 hat eine Höhe 27 von 1692 mm (Millimeter), eine Breite 28 von 222 mm und eine Tiefe 29 von vorzugsweise zwischen 30 und 100 mm, im vorliegenden Fall von 70 mm. Abgesehen von den umlaufenden Gehäusekanten (Vorderkanten 11 gemäß Fig. 1), beträgt die Membranfläche 97% (Prozent) der Vorderseite des Tiefton-Membranlautsprechers 1.2. Diese Vorderseite des Lautsprechers, die die Schallwand des Lautsprechers darstellt, besteht zu 100% aus Lautsprecher-Chassis. In Fig. 2 is a low-frequency diaphragm speaker 1.2 shown, the eight speakers according to FIG. 1 in is composed of a block. From its the housing (10.2) represent the basic body is the upper side wall 14 and the side wall 15.2 detect. The side wall 15.2 is made up of eight side walls 15 1 assembled. In the side wall 15.2 are according to the number of individual speakers 1.1 eight slots 23 are present. The low-frequency diaphragm speaker 1.2 has a height 27 of 1692 mm (millimeters), one Width 28 of 222 mm and a depth 29 of preferably between 30 and 100 mm, in this case 70 mm. Except for the circumferential housing edges (front edges 11 1), the membrane area is 97% (percent) of Front of the woofer diaphragm speaker 1.2. This Front of the speaker covering the baffle of the Loudspeaker consists of 100% loudspeaker chassis.

Bei dem in Fig. 3 dargestellten Tiefton-Membranlautsprecher 1.3 ist keine Trennwand wie bei Fig. 1 vorhanden. Dämm-Material 26.3 ist bei dieser Ausführungsform nur vor der treppenstufig sich nach außen verjüngenden, spaltförmigen Öffnung 23.3 angeordnet. Dämm-Material 26 beziehungsweise 26.3 kann auch an der Innenseite der Rückwand 13 und an der zu der Öffnung 23.3 gegenüberliegenden Seitenwand 14.3 angeordnet sein. Bei der Ausführungsform des Tiefton-Membranlautsprechers 1.3 sind winkelförmige beziehungsweise U-förmige Anschlussteile 9, 16 gemäß Fig. 1 ersetzt worden durch entsprechend profilierte Seitenwände 15.3, 14.3.In the low-frequency diaphragm speaker shown in Fig. 3 1.3 there is no partition as in FIG. 1. Insulating material 26.3 is in this embodiment only before Step-like, tapered, gap-shaped Opening 23.3 arranged. Insulation material 26 respectively 26.3 can also on the inside of the rear wall 13 and on the side wall 14.3 opposite opening 23.3 be arranged. In the embodiment of the low-frequency diaphragm speaker 1.3 are angular respectively U-shaped connecting parts 9, 16 according to FIG. 1 have been replaced through appropriately profiled side walls 15.3, 14.3.

Die Öffnung 23.3 hat eine Länge 30 von etwas weniger als 210 mm. 210 mm beträgt das System-Maß 31 des einzelnen Lautsprechers 1.1 in dem zu einem Block aus acht Lautsprechern zusammengesetzten Lautsprecher 1.2. Auf diese Weise berühren sich die einzelnen schlitzförmigen Öffnungen 23.3 nicht gegenseitig. Die innere Breite 32 der stufenförmig abgetreppten Öffnung 23.3 beträgt im vorliegenden Beispielsfall 18 mm. Die vordere, von außen sichtbare Breite 34 dieser Öffnung 23.3 beträgt zwischen 5 und 15 mm, im vorliegenden Beispielsfall 8 mm. Die vordere Stufendicke 36 beträgt 2 mm. Die Seitenwand 15.3 hat eine Gesamt-Dicke 38 von 5 mm. Eine derartig dünne aus im vorliegenden Beispielsfall Aluminium bestehende Seitenwand ist bei dem Tiefton-Membranlautsprecher 1.1, 1.2, 1.3 möglich, da die Eigen-Resonanzfrequenzen oberhalb der Arbeitsfrequenzen des Tiefton-Lautsprechers liegen.The opening 23.3 has a length 30 of a little less than 210 mm. The system dimension 31 of the individual is 210 mm Speaker 1.1 in a block of eight speakers composite speakers 1.2. Touch this way the individual slot-shaped openings 23.3 do not each other. The inner width 32 of the step stepped opening 23.3 is present Example case 18 mm. The front width, visible from the outside 34 of this opening 23.3 is between 5 and 15 mm, in present example 8 mm. The front step thickness 36 is 2 mm. The side wall 15.3 has an overall thickness 38 of 5 mm. Such a thin one from here Example of aluminum existing side wall is in the Low-frequency diaphragm speakers 1.1, 1.2, 1.3 possible because the Eigen-resonance frequencies above the working frequencies of the Bass speaker.

Claims (14)

  1. Diaphragm-type bass loudspeaker (1),
    with a housing (10), the housing walls (13, 14, 15) of which enclose a volume (25) which is formed on the rear side of the diaphragm (3),
    and with at least one opening (23) in a surface area of the housing walls (13, 14, 15) which bounds the volume (25),
    characterized in that
    the volume (25) is so small that the resonant frequency of the diaphragm-type bass loudspeaker at which the amplifier and the restoring force of the diaphragm (3) act in the same direction lies above 200 Hz, in particular above 1000 Hz, and is consequently in the frequency range of a mid-frequency or treble loudspeaker, and
    the opening (23) is formed such that it is very small, so that at every frequency of the diaphragm-type bass loudspeaker, air emerges from the volume at a great velocity which is acoustically undisturbing.
  2. Diaphragm-type bass loudspeaker (1) according to Claim 1, characterized in that the housing of the diaphragm-type bass loudspeaker (1) is formed by the basic body (2) of the diaphragm-type bass loudspeaker (1) .
  3. Diaphragm-type bass loudspeaker (1) according to Claim 1, characterized in that the housing (10) which encloses the volume (25) contains the basic body (2) of the diaphragm-type bass loudspeaker (1).
  4. Diaphragm-type bass loudspeaker (1) according to one of the preceding claims, characterized in that the opening (23) is a slit.
  5. Diaphragm-type bass loudspeaker (1) according to one of the preceding claims, characterized in that the opening (23) is formed by a gap or bezel gap becoming smaller towards the outside in a step-shaped or conical manner.
  6. Diaphragm-type bass loudspeaker (1) according to one of the preceding claims, characterized in that the opening (23) is located in a very thin-walled housing part.
  7. Diaphragm-type bass loudspeaker (1) according to Claim 6, characterized in that the thin-walled housing part is an aluminium plate.
  8. Diaphragm-type bass loudspeaker (1) according to one of the preceding claims, characterized in that the opening (23) comprises a conically running bore which has a large radius on the inner side of the housing part and opens out towards the outside in an aperture with a very small radius.
  9. Diaphragm-type bass loudspeaker (1) according to one of the preceding claims, characterized in that at least the housing part (20) which makes the opening (23) is produced from metal.
  10. Diaphragm-type bass loudspeaker according to one of the preceding claims, characterized in that a number of diaphragm-type bass loudspeakers (1.1), eight in particular, are assembled into a block.
  11. Diaphragm-type bass loudspeaker (1.2) according to Claim 10, characterized in that the block has a single housing (10.2).
  12. Diaphragm-type bass loudspeaker according to Claim 10 or 11, characterized in that the block has a depth (30) of 30 to 100 mm, in paricular of 70 mm.
  13. Diaphragm-type bass loudspeaker (1.2)according to one of Claims 10 or 12, characterized in that the block of eight diaphragm-type bass loudspeakers (1.1) has a height (27) of approximately 1692 mm, a width (28) of approximately 222 mm and a depth (29) of approximately 70 mm.
  14. Diaphragm-type bass loudspeaker (1; 1.2) according to one of the preceding claims, characterized in that there is insulating material (26; 26.3) in the volume (25; 25.3), and at least in front of the opening (23; 23.3) there.
EP99967891A 1998-12-21 1999-12-21 Low-frequency diaphragm speaker Expired - Lifetime EP1142445B1 (en)

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DE19859046A DE19859046A1 (en) 1998-12-21 1998-12-21 Low-frequency diaphragm speaker
DE19859046 1998-12-21
PCT/DE1999/004073 WO2000038474A2 (en) 1998-12-21 1999-12-21 Low-frequency diaphragm speaker

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EP (1) EP1142445B1 (en)
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AT (1) ATE226781T1 (en)
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DK (1) DK1142445T3 (en)
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JP4811367B2 (en) * 2007-07-24 2011-11-09 ソニー株式会社 Vibration material, audio output device
JP5188839B2 (en) * 2008-02-28 2013-04-24 株式会社ジャムコ Flat panel speaker
US9301043B2 (en) * 2013-05-01 2016-03-29 Harman International Industries, Inc. Sealed speaker system having a pressure vent

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PT1142445E (en) 2003-03-31
JP2003508937A (en) 2003-03-04
ATE226781T1 (en) 2002-11-15
US20020012439A1 (en) 2002-01-31
WO2000038474A3 (en) 2000-11-23
DK1142445T3 (en) 2003-02-24
DE59903210D1 (en) 2002-11-28
EP1142445A2 (en) 2001-10-10
AU2428700A (en) 2000-07-12
ES2186434T3 (en) 2003-05-01
WO2000038474A2 (en) 2000-06-29
DE19982826D2 (en) 2002-01-03
DE19859046A1 (en) 2000-07-20

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