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EP0083310A1 - Electro-acoustic transducer - Google Patents

Electro-acoustic transducer Download PDF

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Publication number
EP0083310A1
EP0083310A1 EP82810561A EP82810561A EP0083310A1 EP 0083310 A1 EP0083310 A1 EP 0083310A1 EP 82810561 A EP82810561 A EP 82810561A EP 82810561 A EP82810561 A EP 82810561A EP 0083310 A1 EP0083310 A1 EP 0083310A1
Authority
EP
European Patent Office
Prior art keywords
oscillating element
carcass
oscillating
electro
transducer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82810561A
Other languages
German (de)
French (fr)
Other versions
EP0083310B1 (en
Inventor
Marcel Fresard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Multiphonie SA
Original Assignee
Multiphonie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Multiphonie SA filed Critical Multiphonie SA
Priority to AT82810561T priority Critical patent/ATE26055T1/en
Publication of EP0083310A1 publication Critical patent/EP0083310A1/en
Application granted granted Critical
Publication of EP0083310B1 publication Critical patent/EP0083310B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia

Definitions

  • the present invention relates to an electro-acoustic transducer comprising a magnetic carcass with a circular cylindrical air gap and an oscillating element carrying a coil immersed in this air gap.
  • One or more loudspeakers are generally used for the emission of sound waves, which by their nature have a fairly marked directional effect.
  • the listener In the case of stereophonic broadcasting, the listener must be at the point of convergence of the waves emitted by two or more speakers. This requirement is rarely compatible with a harmonious interior design, and the integration of a loudspeaker often, of considerable dimensions, in the furniture of a room is generally not aesthetic.
  • the object of the present invention is to remedy these drawbacks and to allow a much more homogeneous sound diffusion and having less directional effects than in the case of the diffusion of sound waves by loudspeakers.
  • the electro-acoustic transducer according to the present invention is characterized in that the oscillating element is rigid and conforms to allow its attachment to a panel, the magnetic carcass playing the role of inertia mass and being connected to the oscillating element by at least one elastomer part.
  • the invention further relates to a use of said electro-acoustic transducer in an installation for the emission of sound waves, characterized in that said transducers are rigidly fixed by their oscillating element to panels in order to transmit to the latter vibrations generating sound waves.
  • a suspended ceiling is constituted in a manner known per se by panels 1, having on their upper face loops 2 for the passage of hooks 3, themselves fixed to a slab 4, constituting the floor d 'an upper floor.
  • This base metal plate 6 has holes 20 to allow it to be screwed to the wall element (fig. 2).
  • the construction of the transducer shown in Figures 2 and 3 is very close to that of a speaker.
  • the base metal plate 6 has a cylindrical central part 7 made of non-ferromagnetic material, for example aluminum.
  • This cylinder carries a winding 8, the two ends of which are connected to two contact fingers 9 and 9 '.
  • the transducer comprises a magnetic carcass comprising a ferromagnetic central part 12 integral with a flange 13, a permanent magnet 14 in the form of a disc, a permanent magnet 15 in the form of an annulus, a part 11 in the form of a bell and a flat metal ring 17.
  • the flange 13 is disposed between the magnet 14 in the form of a disc and the magnet 15 of annular shape, an annular part 16 made of non-ferromagnetic material keeping the latter 15 centered with respect to the central part 12.
  • the magnetic carcass 11 to 17 is connected to the plate 6 by a piece 10 of elastomer.
  • This part 10 constitutes a dust-tight annular seal between the plate 6 and the bell-shaped part 11.
  • the elastomer part 10 has two internal annular ribs 18 and 19, the first is engaged in a peripheral groove at the base of the skirt of the part 11 in the shape of a bell.
  • the base of the part 10 is engaged in a large centering groove 21 provided in the plate 6.
  • the cylindrical part 7 and the winding 8 engage in a cylindrical space provided between the central part 12 and the annular part 16 for centering.
  • the elastomer part 10 has sufficient flexibility to allow relative axial displacements between the cylinder 7 and the central core 12, while ensuring good radial guidance between this core 12 and the cylinder 7.
  • the magnetic carcass with the magnets 14 and 15 constitutes a relatively heavy part, which acts as a mass of inertia, so that the relative displacements between the core 12 and the cylinder 7 transmit vibrations to the plate 6 and therefore to the panels 1 from the suspended ceiling.
  • the wall element has a large surface area, which allows good quality reproduction of musical signals, especially low notes.
  • transducers 5 must be connected so as to be in phase with one another.
  • transducers can be fixed to any other wall element, this wall being able to be a wall of the room to be sounded or even a wall of a piece of furniture located in this room.
  • a single transducer may be sufficient when the room does not have large dimensions.
  • the transducer 5 ′ includes means for exerting a force on the elastomer part 10 so as to modify its elasticity characteristics.
  • These means include a central adjustment screw 22 connecting the magnetic casing 11 - 17 to the oscillating element 6 - 8.
  • the head of the adjustment screw 22 is supported on a washer 23 and the latter in turn is supported on a elastic element constituted by a rubber ring 24 inserted in a recess 25 provided in the central part of the metal plate 6 of the oscillating element 6 - 8.
  • the screw 22 engages by its other end in a tapped hole in the part central 12.
  • FIG. 5 Another embodiment of the electro-acoustic transducer is shown in Figure 5. This embodiment differs from the previous one by the fact that the elastomer part 10 instead of being disposed at the periphery of the skirt the bell-shaped part 11 is inserted in the form of an elastomer ring 10 'between the base plate 6 and the metal ring 17.
  • the base plate 6 has four holes 26 through which four adjustment screws 27 are introduced.
  • the latter 27 pass through the elastomer ring 10 'and engage in threaded holes in the metal ring 17. A more or less tightening of these screws makes it possible to adjust the elasticity characteristics of the elastomer part 10 ′ as a function of the mounting conditions and the desired sound diffusion effect. It should be noted that the elastomer ring 10 'constitutes a dust-tight seal protecting the internal components of the transducer.
  • the elastomer ring 10 ′ could be replaced by four elastomer studs engaged in the holes 26 of the base plate and traversed by the adjustment screws 27.
  • the internal components of the transducer are no longer protected dust, unless an additional seal is provided for this purpose.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

The electroacoustic transducer comprises an oscillating element (6, 7) holding a coil (8), the oscillating element (6, 7) being connected to a magnet frame (11-17) by an elastomer ring (10'). The magnet frame (11-17) has two magnets (14, 15) and constitutes an inertial mass. The oscillating element (6, 7) is intended to be attached rigidly by its base plate (6) to a panel (1) so that the sound waves are transmitted to the latter (1) which thus plays the role of a speaker diaphragm. Adjusting screws (27) make it possible to modify the characteristics of the elastomer (10') as a function of the mounting condition and the desired sound diffusion effect.

Description

La présente invéntion a pour objet un transducteur électro-acoustique comprenant une carcasse magnétique avec un entrefer cylindrique circulaire et un élément oscillant portant une bobine plongée dans cet entrefer.The present invention relates to an electro-acoustic transducer comprising a magnetic carcass with a circular cylindrical air gap and an oscillating element carrying a coil immersed in this air gap.

Pour l'émission d'ondes sonores, on utilise généralement un ou plusieurs haut-parleurs, qui présentent de par leur nature un effet directionnel assez marqué.One or more loudspeakers are generally used for the emission of sound waves, which by their nature have a fairly marked directional effect.

L'émission des sons est gênée par des réflexions contre les parois des locaux où elles ont lieu.The emission of sounds is hampered by reflections against the walls of the premises where they take place.

Dans le cas de la diffusion stéréophonique, il est nécessaire que l'auditeur se trouve au point de convergeance des ondes émises par deux ou plusieurs haut-parleurs. Cet impératif est rarement compatible avec un aménagement intérieur harmonieux,et l'intégration d'un haut-parleur souvent, de dimensions considérables, au mobilier d'une pièce n'est généralement pas esthétique.In the case of stereophonic broadcasting, the listener must be at the point of convergence of the waves emitted by two or more speakers. This requirement is rarely compatible with a harmonious interior design, and the integration of a loudspeaker often, of considerable dimensions, in the furniture of a room is generally not aesthetic.

La présente invention a pour but de remédier à ces inconvénients et de permettre une diffusion sonore beaucoup plus homogène et présentant moins d'effets directionnels que dans le cas de la diffusion d'ondes sonores par des haut-parleurs.The object of the present invention is to remedy these drawbacks and to allow a much more homogeneous sound diffusion and having less directional effects than in the case of the diffusion of sound waves by loudspeakers.

A cet effet, le transducteur électro-acoustique selon la présente invention est caractérisé en ce que l'élément oscillant est rigide et est conforme pour permettre sa fixation à un panneau, la carcasse magnétique jouant le rôle de masse d'inertie et étant reliée à l'élément oscillant par au moins une pièce en élastomère.To this end, the electro-acoustic transducer according to the present invention is characterized in that the oscillating element is rigid and conforms to allow its attachment to a panel, the magnetic carcass playing the role of inertia mass and being connected to the oscillating element by at least one elastomer part.

L'invention concerne, en outre, une utilisation dudit transducteur électro-acoustique dans une installation pour l'émission d'ondes sonores, caractérisé en ce que lesdits transducteurs sont fixés rigidement par leur élément oscillant à des panneaux afin de transmettre à ces derniers des vibrations génératrices d'ondes sonores.The invention further relates to a use of said electro-acoustic transducer in an installation for the emission of sound waves, characterized in that said transducers are rigidly fixed by their oscillating element to panels in order to transmit to the latter vibrations generating sound waves.

Le dessin annexé représente schématiquement et à titre d'exemple deux formes d'exécution de l'invention.

  • La figure 1 est une coupe verticale d'un plafond suspendu, équipé de transducteurs électro-acoustiques selon l'invention.
  • La figure 2 est une vue de dessus du transducteur selon la première forme d'exécution.
  • La figure 3 est une coupe selon la ligne III-III de la figure 2.
  • La figure 4 est une vue partielle en coupe axiale d'une variante du transducteur électro-acoustique de la figure 3.
  • La figure 5 est une coupe axiale de la deuxième forme d'exécution du transducteur.
The accompanying drawing shows schematically and by way of example two embodiments of the invention.
  • Figure 1 is a vertical section of a suspended ceiling, equipped with electro-acoustic transducers according to the invention.
  • Figure 2 is a top view of the transducer according to the first embodiment.
  • Figure 3 is a section along line III-III of Figure 2.
  • FIG. 4 is a partial view in axial section of a variant of the electro-acoustic transducer of FIG. 3.
  • Figure 5 is an axial section of the second embodiment of the transducer.

En référence à la figure 1, un plafond suspendu est constitué de façon connue en soi par des panneaux 1, présentant à leur face supérieure des boucles 2 pour le passage de crochets 3, fixés eux-mêmes à une dalle 4, constituant le plancher d'un étage supérieur.Referring to Figure 1, a suspended ceiling is constituted in a manner known per se by panels 1, having on their upper face loops 2 for the passage of hooks 3, themselves fixed to a slab 4, constituting the floor d 'an upper floor.

Plusieurs de ces panneaux 1 sont équipés d'un ou de plusieurs transducteurs électro-acoustiques 5. Ces derniers sont rendus solidaires du panneau 1 par leur plaque métallique de base 6.Several of these panels 1 are equipped with one or more electro-acoustic transducers 5. The latter are made integral with the panel 1 by their basic metal plate 6.

Cette plaque métallique de base 6 présente des trous 20 pour permettre de la visser à l'élément de paroi (fig. 2).This base metal plate 6 has holes 20 to allow it to be screwed to the wall element (fig. 2).

La construction du transducteur représenté aux figures 2 et 3 est très proche de celle d'un haut-parleur. La plaque métallique de base 6 présente une partie centrale cylindrique 7 en matière non ferromagnétique, par exemple en aluminium. Ce cylindre porte un enroulement 8 dont les deux extrémités sont reliées à deux doigts de contact 9 et 9'.The construction of the transducer shown in Figures 2 and 3 is very close to that of a speaker. The base metal plate 6 has a cylindrical central part 7 made of non-ferromagnetic material, for example aluminum. This cylinder carries a winding 8, the two ends of which are connected to two contact fingers 9 and 9 '.

La plaque métallique de base 6, sa partie cylindrique 7 et l'enroulement 8 constituent ensemble un élément oscillant du transducteur 5.The base metal plate 6, its cylindrical part 7 and the winding 8 together constitute an oscillating element of the transducer 5.

Comme le montre la figure 3 le transducteur comporte une carcasse magnétique comprenant une pièce centrale 12 ferromagnétique solidaire d'un flasque 13, un aimant permanent 14 en forme de disque, un aimant permanent 15 de forme annulaire, une pièce 11 en forme de cloche et un anneau métallique plat 17. Le flasque 13 est disposé entre l'aimant 14 en forme de disque et l'aimant 15 de forme annulaire, une pièce annulaire 16 en matière non ferromagnétique maintenant ce dernier 15 centré par rapport à la pièce centrale 12.As shown in FIG. 3, the transducer comprises a magnetic carcass comprising a ferromagnetic central part 12 integral with a flange 13, a permanent magnet 14 in the form of a disc, a permanent magnet 15 in the form of an annulus, a part 11 in the form of a bell and a flat metal ring 17. The flange 13 is disposed between the magnet 14 in the form of a disc and the magnet 15 of annular shape, an annular part 16 made of non-ferromagnetic material keeping the latter 15 centered with respect to the central part 12.

La carcasse magnétique 11 à 17 est reliée à la plaque 6 par une pièce 10 en élastomère. Cette pièce 10 constitue un joint annulaire étanche à la poussière entre la plaque 6 et la pièce 11 en forme de cloche.The magnetic carcass 11 to 17 is connected to the plate 6 by a piece 10 of elastomer. This part 10 constitutes a dust-tight annular seal between the plate 6 and the bell-shaped part 11.

Il y a lieu de remarquer que la pièce 10 en élastomère présente deux nervures annulaires intérieures 18 et 19, la première est engagée dans une gorge périphérique à la base de la jupe de la pièce 11 en forme de cloche.It should be noted that the elastomer part 10 has two internal annular ribs 18 and 19, the first is engaged in a peripheral groove at the base of the skirt of the part 11 in the shape of a bell.

La base de la pièce 10 est engagée dans une large rainure de centrage 21 prévue dans la plaque 6.The base of the part 10 is engaged in a large centering groove 21 provided in the plate 6.

La partie cylindrique 7 et l'enroulement 8 s'engagent dans un espace cylindrique prévu entre la pièce centrale 12 et la pièce annulaire 16 de centrage.The cylindrical part 7 and the winding 8 engage in a cylindrical space provided between the central part 12 and the annular part 16 for centering.

La pièce 10 en élastomère présente une souplesse suffisante pour permettre des déplacements relatifs axiaux entre le cylindre 7 et le noyau central 12, tout en assurant un bon guidage radial entre ce noyau 12 et le cylindre 7.The elastomer part 10 has sufficient flexibility to allow relative axial displacements between the cylinder 7 and the central core 12, while ensuring good radial guidance between this core 12 and the cylinder 7.

La carcasse magnétique avec les aimants 14 et 15 constitue une pièce relativement lourde, qui agit comme une masse d'inertie, de sorte que les déplacements relatifs entre le noyau 12 et le cylindre 7 transmettent des vibrations à la plaque 6 et donc aux panneaux 1 du plafond suspendu.The magnetic carcass with the magnets 14 and 15 constitutes a relatively heavy part, which acts as a mass of inertia, so that the relative displacements between the core 12 and the cylinder 7 transmit vibrations to the plate 6 and therefore to the panels 1 from the suspended ceiling.

Ces panneaux jouent le rôle d'une membrane de haut-parleur. Dans la plupart des cas, l'élément de paroi présente une grande surface, ce qui permet une bonne qualité de reproduction des signaux musicaux, notamment des notes graves.These panels act as a speaker membrane. In most cases, the wall element has a large surface area, which allows good quality reproduction of musical signals, especially low notes.

Bien entendu, il est nécessaire de choisir le nombre des transducteurs 5 en fonction du niveau sonore que l'on désire obtenir dans l'espace qui doit être sonorisé.Of course, it is necessary to choose the number of transducers 5 as a function of the sound level which it is desired to obtain in the space which is to be soundproofed.

Il va de soi que les transducteurs 5 doivent être branchés de façon à être en phase les uns avec les autres.It goes without saying that the transducers 5 must be connected so as to be in phase with one another.

Il est clair que les transducteurs peuvent être fixés à tout autre élément de paroi, cette paroi pouvant être une paroi du local à sonoriser ou encore une paroi d'un meuble situé dans ce local.It is clear that the transducers can be fixed to any other wall element, this wall being able to be a wall of the room to be sounded or even a wall of a piece of furniture located in this room.

A la limite un seul transducteur peut être suffisant lorsque le local ne présente pas de grandes dimensions.Ultimately, a single transducer may be sufficient when the room does not have large dimensions.

Selon une variante représentée à la figure 4, le transducteur 5' comporte des moyens pour exercer une force sur la pièce 10 en élastomère de façon à modifier ses caractéristiques d'élasticité. Ces moyens comprennent une vis de réglage central 22 reliant la carcasse magnétique 11 - 17 à l'élément oscillant 6 - 8. La tête de la vis de réglage 22 prend appui sur une rondelle 23 et cette dernière s'appuie à son tour sur un élément élastique constitué par une bague 24 en caoutchouc insérée dans un évidement 25 prévu dans la partie centrale de la plaque métallique 6 de l'élément oscillant 6 - 8. La vis 22 s'engage par son autre extrémité dans un trou taraudé de la pièce centrale 12. Par action sur la vis de réglage 22, il est ainsi possible d'appliquer une force plus ou moins grande sur la pièce 10 en élastomère de façon à obtenir des conditions optimales de diffusion des ondes sonores.According to a variant shown in FIG. 4, the transducer 5 ′ includes means for exerting a force on the elastomer part 10 so as to modify its elasticity characteristics. These means include a central adjustment screw 22 connecting the magnetic casing 11 - 17 to the oscillating element 6 - 8. The head of the adjustment screw 22 is supported on a washer 23 and the latter in turn is supported on a elastic element constituted by a rubber ring 24 inserted in a recess 25 provided in the central part of the metal plate 6 of the oscillating element 6 - 8. The screw 22 engages by its other end in a tapped hole in the part central 12. By acting on the adjusting screw 22, it it is thus possible to apply a greater or lesser force on the elastomer part 10 so as to obtain optimal conditions for the diffusion of sound waves.

Une autre forme d'exécution du transducteur électro-acoustique est représenté à la figure 5. Cette forme d'exécution se distingue de la précédente par le fait que la pièce 10 en élastomère au lieu d'être disposée à la périphérie de la jupe de la pièce 11 en forme de cloche, est insérée sous forme d'une bague 10' en élastomère entre la plaque 6 de base et l'anneau métallique 17.Another embodiment of the electro-acoustic transducer is shown in Figure 5. This embodiment differs from the previous one by the fact that the elastomer part 10 instead of being disposed at the periphery of the skirt the bell-shaped part 11 is inserted in the form of an elastomer ring 10 'between the base plate 6 and the metal ring 17.

La plaque 6 de base comporte quatre trous 26 par lesquels sont introduits quatre vis de réglage 27. Ces dernières 27 traversent la bague 10' en élastomère et s'engagent dans des trous taraudés de l'anneau métallique 17. Un serrage plus ou moins fort de ces vis permet d'ajuster les caractéristiques d'élasticité de la pièce en élastomère 10' en fonction des conditions de montage et de l'effet de diffusion sonore désiré. Il y a lieu de remarquer que la bague 10' en élastomère constitue un joint étanche à la poussière protégeant les composants internes du transducteur.The base plate 6 has four holes 26 through which four adjustment screws 27 are introduced. The latter 27 pass through the elastomer ring 10 'and engage in threaded holes in the metal ring 17. A more or less tightening of these screws makes it possible to adjust the elasticity characteristics of the elastomer part 10 ′ as a function of the mounting conditions and the desired sound diffusion effect. It should be noted that the elastomer ring 10 'constitutes a dust-tight seal protecting the internal components of the transducer.

Selon une variante, la bague 10' en élastomère pourrait être remplacée par quatre tétons en élastomère engagés dans les trous 26 de la plaque de base et traversés par les vis de réglage 27. Dans cette variante, les composants internes du transducteur ne sont plus protégés de la poussière, à moins qu'un joint supplémentaire ne soit prévu à cet effet.According to a variant, the elastomer ring 10 ′ could be replaced by four elastomer studs engaged in the holes 26 of the base plate and traversed by the adjustment screws 27. In this variant, the internal components of the transducer are no longer protected dust, unless an additional seal is provided for this purpose.

Claims (6)

1. Transducteur électro-acoustique comprenant une carcasse magnétique avec un entrefer cylindrique circulaire et un élément oscillant portant une bobine plongée dans cet entrefer, caractérisé en ce que l'élément oscillant est rigide et est conforme pour permettre sa fixation à un panneau, la carcasse jouant le rôle de masse d'inertie et étant reliée à l'élément oscillant par au moins une pièce en élastomère.1. Electro-acoustic transducer comprising a magnetic carcass with a circular cylindrical air gap and an oscillating element carrying a coil immersed in this air gap, characterized in that the oscillating element is rigid and conforms to allow its attachment to a panel, the carcass playing the role of inertial mass and being connected to the oscillating element by at least one elastomer part. 2. Transducteur selon la revendication 1, caractérisé en ce que la pièce en élastomère relie, de façon étanche à la poussière, la carcasse et l'élément oscillant.2. Transducer according to claim 1, characterized in that the elastomer part connects, in a dust-tight manner, the carcass and the oscillating element. 3. Transducteur selon la revendication 2, caractérisé er ce qu'il présente des moyens pour exercer une force sur la pièce en élastomère de façon à modifier ses caractéristiques d'élasticité.3. Transducer according to claim 2, characterized er that it has means for exerting a force on the elastomer part so as to modify its elasticity characteristics. 4. Transducteur selon la revendication 3, caractérisé en ce qu'au moins une vis relie la carcasse à l'élément oscillant par l'intermédiaire d'un élément élastique, ladite force agissant sur la pièce en élastomère étant exercée par cette vis et ledit élément élastique, cette force étant réglable par action sur la vis.4. A transducer according to claim 3, characterized in that at least one screw connects the carcass to the oscillating element via an elastic element, said force acting on the elastomer part being exerted by this screw and said elastic element, this force being adjustable by action on the screw. 5. Transducteur selon l'une des revendications précédentes, caractérisé en ce que l'élément oscillant est constitué par une plaque métallique présentant des trous pour permettre sa fixation audit panneau au moyen de vis.5. Transducer according to one of the preceding claims, characterized in that the oscillating element consists of a metal plate having holes to allow its attachment to said panel by means of screws. 6. Utilisation de transducteurs électro-acoustiques selon la revendication 1 dans une installation pour l'émission d'ondes sonores, caractérisé en ce que lesdits transducteurs sont fixés rigidement par leur élément oscillant à des panneaux, afin de transmettre à ces derniers des vibrations génératrices d'ondes sonores.6. Use of electro-acoustic transducers according to claim 1 in an installation for the emission of sound waves, characterized in that said transducers are rigidly fixed by their element oscillating on panels, in order to transmit vibrations generating sound waves to them.
EP82810561A 1981-12-22 1982-12-21 Electro-acoustic transducer Expired EP0083310B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82810561T ATE26055T1 (en) 1981-12-22 1982-12-21 ELECTROACOUSTIC TRANSDUCER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH819981A CH645227A5 (en) 1981-12-22 1981-12-22 ELECTRO-ACOUSTIC TRANSDUCER.
CH8199/81 1981-12-22

Publications (2)

Publication Number Publication Date
EP0083310A1 true EP0083310A1 (en) 1983-07-06
EP0083310B1 EP0083310B1 (en) 1987-03-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810561A Expired EP0083310B1 (en) 1981-12-22 1982-12-21 Electro-acoustic transducer

Country Status (6)

Country Link
US (1) US4506117A (en)
EP (1) EP0083310B1 (en)
AT (1) ATE26055T1 (en)
CA (1) CA1191937A (en)
CH (1) CH645227A5 (en)
DE (1) DE3275803D1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP0158978A2 (en) * 1984-04-17 1985-10-23 Jürgen Dipl.-Ing. Quaas Mounting of transducers on a baffle, particularly for loudspeakers, preferentially for loudspeaker boxes

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Also Published As

Publication number Publication date
ATE26055T1 (en) 1987-04-15
CH645227A5 (en) 1984-09-14
CA1191937A (en) 1985-08-13
EP0083310B1 (en) 1987-03-18
DE3275803D1 (en) 1987-04-23
US4506117A (en) 1985-03-19

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