EP0814637A2 - Method for producing a diaphragm for an electroacoustic transducer - Google Patents
Method for producing a diaphragm for an electroacoustic transducer Download PDFInfo
- Publication number
- EP0814637A2 EP0814637A2 EP97890105A EP97890105A EP0814637A2 EP 0814637 A2 EP0814637 A2 EP 0814637A2 EP 97890105 A EP97890105 A EP 97890105A EP 97890105 A EP97890105 A EP 97890105A EP 0814637 A2 EP0814637 A2 EP 0814637A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- thickness
- area
- dome
- fixing device
- 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.)
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Classifications
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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
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
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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
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/029—Diaphragms comprising fibres
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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
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49005—Acoustic transducer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/4908—Acoustic transducer
Definitions
- the invention relates to a method for producing a membrane with different thickness partial areas from a thermoplastic deformable material of constant thickness for an electroacoustic transducer, which works according to the electrodynamic principle.
- the behavior of the membrane is of particular importance for the functioning of every electroacoustic transducer, since it plays a key role in determining the transducer transmission characteristics.
- the behavior of the membrane depends not only on the material properties but also very much on its shape.
- a membrane shape has generally proven itself, as is shown schematically in FIG. 1.
- the center of the membrane is dome-shaped and surrounded by a toroidal part, which is followed by an edge for attachment to the magnet system.
- the moving coil which moves in a radial magnetic field, is attached below the dome.
- the aim of all constructive measures is to achieve a piston-shaped movement of the moving coil at all frequencies and amplitudes.
- the central dome should be made as stiff as possible in order to prevent the occurrence of vibration modes even at high frequencies, which would otherwise lead to drops in the frequency response.
- the toroidal part is decisive for the suspension and is often tangential to the inside diameter Provide depressions, the so-called beads. Therefore, the term "beading zone" has generally been used for this part. The softer this bead zone is, the better the sensitivity will be in the low-frequency transmission range.
- the membrane material which is usually in the form of a film, is pressed into an embossing mold with the application of pressure and heat. After a cooling phase, the film is removed and then the final membrane is punched out. With this type of production - apart from the shape - no distinction is made between the dome zone and the bead zone.
- stiffening of the dome zone can be achieved by applying a second layer.
- proposed in EP 0 446 515 A2 to even provide the concave side of the dome with a metal mesh.
- central dome part Another possibility to increase the stiffness of the central dome part is by a special shape of this part, e.g. through a central depression, as can be seen from FIG. 1 of EP 0 137 624 A2.
- DE 43 29 637 A1 describes the formation of ribs.
- the central dome part is first made larger than desired and then provided in a second deformation process with randomly occurring stiffening ribs.
- the methods mentioned are time-consuming and therefore costly.
- the present invention has set itself the goal of avoiding these disadvantages and of providing a simple, precisely definable production method for membranes with sub-regions of different thicknesses which can be used advantageously for electrodynamic transducers.
- the membrane with different thickness partial areas is produced from a material of constant thickness by a multi-stage thermoplastic embossing process.
- a first operation that area of the membrane material which is to have a greater thickness in the finished membrane is held by an inner fixing device, while the remaining area is additionally held by an outer fixing device and is drawn to a smaller thickness under the action of tension and heat becomes.
- a second step the entire membrane is embossed in one mold.
- the dome is embossed from the fixed area of the membrane material and the bead zone from the remaining preferred area of the membrane material.
- FIG. 1 shows in cross section the complete membrane with plunger coil for an electrodynamic transducer
- FIG. 2 shows schematically the inner and outer fixing device with the inserted membrane material
- 4 shows in cross section the preferred membrane material with the much thicker central part
- FIG. 5 shows the finished membrane of an electrodynamic transducer according to the invention in cross section.
- Fig. 1 shows the sectional view of a complete membrane with the moving coil for an electrodynamic converter.
- the central dome area 1 is surrounded by a toroidal part 2.
- the outer membrane edge 3 is used for attachment to the magnet system (not shown).
- the moving coil 4 is glued to the membrane.
- the diameter of the moving coil 4 corresponds approximately to the outer diameter of the central dome area 1.
- the outer fixing device 7, 7 ' encloses an area which corresponds approximately to twice the diameter of the membrane that has been produced.
- the fixing devices each consist of two jaws 6, 6 'and 7, 7', which are arranged above and below the membrane material 5. These two jaws 6, 6 'and 7, 7' are pressed together so tightly that the membrane material 5 in between is held firmly. In order to prevent the membrane material from being damaged during fixation, the two jaws can additionally be provided with elastic sealing elements 12, 12 'and 13, 13'.
- the annular edge region 9 between the inner 6, 6 'and outer 7, 7' fixing device can be reduced in thickness, as shown in FIG. 3 is shown schematically.
- the heat necessary for pulling forward the membrane material 5 can be supplied by air or by radiation.
- the membrane material 5 is heated directly with warm air, in the second case surrounding parts, for example the massive parts of the fixing devices, are heated electrically and in turn irradiate the membrane material 5.
- FIG. 4 shows the result of this first operation, namely a membrane film that is thicker in its central area 8 than in its edge area 9.
- this film is then embossed and punched out using a conventional membrane shape.
- Fig. 5 shows a finished punched membrane, the dome 10 is much thicker than the bead zone 11. Thickness differences between the dome and the bead zone of approx. 50% could be realized in this way.
- the outer and inner fixing device and the final embossing mold can be combined with one another and arranged to be axially movable relative to one another, so that the manufacturing method according to the invention can run automatically by means of a suitable control device.
- membranes for electroacoustic transducers can be produced inexpensively, which have a thick dome zone and a thinner bead zone, which significantly improves their vibration behavior.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung einer Membran mit verschieden dicken Teilbereichen aus einem thermoplastisch verformbaren Material konstanter Dicke für einen elektroakustischen Wandler, der nach dem elektrodynamischen Prinzip arbeitet.The invention relates to a method for producing a membrane with different thickness partial areas from a thermoplastic deformable material of constant thickness for an electroacoustic transducer, which works according to the electrodynamic principle.
Das Verhalten der Membran ist für die Funktionsweise jedes elektroakustischen Wandlers von besonderer Bedeutung, da sie ganz wesentlich die Übertragungseigenschaften des Wandlers mitbestimmt. Das Verhalten der Membran hängt neben den Materialeigenschaften auch ganz wesentlich von ihrer Form ab. Für elektroakustische Wandler, die nach dem elektrodynamischen Prinzip arbeiten, hat sich eine Membranform allgemein bewährt, wie sie in Fig. 1 schematisch dargestellt ist.The behavior of the membrane is of particular importance for the functioning of every electroacoustic transducer, since it plays a key role in determining the transducer transmission characteristics. The behavior of the membrane depends not only on the material properties but also very much on its shape. For electroacoustic transducers that work according to the electrodynamic principle, a membrane shape has generally proven itself, as is shown schematically in FIG. 1.
Das Zentrum der Membran ist kuppelförmig ausgebildet und von einem toroidförmigen Teil umgeben, an dem sich ein Rand für die Befestigung am Magnetsystem anschließt. Unterhalb der Kuppel wird die Tauchspule befestigt, die sich in einem radial verlaufenden Magnetfeld bewegt.The center of the membrane is dome-shaped and surrounded by a toroidal part, which is followed by an edge for attachment to the magnet system. The moving coil, which moves in a radial magnetic field, is attached below the dome.
Das Ziel aller konstruktiven Maßnahmen ist es, eine kolbenförmige Bewegung der Tauchspule bei allen Frequenzen und Amplituden zu erreichen. Zu diesem Zweck ist es erforderlich, die einzelnen Membranteile entsprechend ihrer Funktion unterschiedlich zu gestalten.The aim of all constructive measures is to achieve a piston-shaped movement of the moving coil at all frequencies and amplitudes. For this purpose, it is necessary to design the individual membrane parts differently according to their function.
Die zentrale Kuppel soll dabei möglichst steif ausgeführt werden, um auch bei hohen Frequenzen die Entstehung von Schwingungsmoden zu unterbinden, die sonst zu Einbrüchen im Frequenzgang führen würden.The central dome should be made as stiff as possible in order to prevent the occurrence of vibration modes even at high frequencies, which would otherwise lead to drops in the frequency response.
Der toroidförmige Teil ist für die Federung maßgebend und wird häufig mit tangential zum Innendurchmesser verlaufenden Vertiefungen, den sogenannten Sicken, versehen. Daher hat sich für diesen Teil allgemein der Ausdruck "Sickenzone" durchgesetzt. Je weicher diese Sickenzone ist, um so besser wird die Empfindlichkeit im tieffrequenten Übertragungsbereich sein.The toroidal part is decisive for the suspension and is often tangential to the inside diameter Provide depressions, the so-called beads. Therefore, the term "beading zone" has generally been used for this part. The softer this bead zone is, the better the sensitivity will be in the low-frequency transmission range.
Diese unterschiedlichen Forderungen an die Teilbereiche einer Membran eines elektroakustischen Wandlers können dann optimal erfüllt werden, wenn jeder Teilbereich unterschiedlich gestaltet wird. Bei der Fertigung einer Membran wird jedoch häufig auf diese unterschiedlichen Anforderungen nicht Rücksicht genommen. So wird das Membranmaterial, das üblicherweise in Folienform vorliegt, unter Zuführung von Druck und Wärme in eine Prägeform gepreßt. Nach einer Erkaltungsphase wird die Folie entnommen und anschließend die endgültige Membran ausgestanzt. Bei dieser Fertigungsart - wird außer durch die Formgebung - kein Unterschied zwischen Kuppelzone und Sickenzone gemacht.These different requirements for the partial areas of a membrane of an electroacoustic transducer can be optimally met if each partial area is designed differently. However, these different requirements are often not taken into account when manufacturing a membrane. Thus, the membrane material, which is usually in the form of a film, is pressed into an embossing mold with the application of pressure and heat. After a cooling phase, the film is removed and then the final membrane is punched out. With this type of production - apart from the shape - no distinction is made between the dome zone and the bead zone.
Sehr häufig wurden daher Methoden vorgeschlagen, die eine Versteifung der Kuppelzone vorsehen. So kann z.B. durch das Aufbringen einer zweiten Schicht eine Versteifung der Kuppelzone erreicht werden. So wurde z.B. in der EP 0 446 515 A2 vorgeschlagen, die konkave Seite der Kuppel sogar mit einem Metallgewebe zu versehen.Very often, methods have been proposed which stiffen the dome zone. For example, stiffening of the dome zone can be achieved by applying a second layer. For example, proposed in EP 0 446 515 A2 to even provide the concave side of the dome with a metal mesh.
Eine weitere Möglichkeit, einen steifen Kuppelbereich zu erhalten, besteht darin, die Membran unterschiedlich dick zu gestalten. Im Lautsprecherbau etwa werden Membranen verwendet, die verschieden dicke Teilbereich aufweisen. So wird in der DE 38 38 853 C1 eine spezielle Dickenverteilung des zentralen und des Konusbereichs angegeben, um günstige Übertragungseigenschaften zu gewährleisten.Another way to obtain a stiff dome area is to make the membrane of different thickness. In loudspeaker construction, for example, membranes are used that have different thicknesses. DE 38 38 853 C1, for example, specifies a special thickness distribution of the central and conical areas in order to ensure favorable transmission properties.
Es besteht auch die Möglichkeit, die Membran zu teilen und den zentralen Teil aus einem dickeren Material herzustellen, wie dies in der EP 0 204 386 A1 beschrieben ist.There is also the possibility of dividing the membrane and producing the central part from a thicker material, as is described in EP 0 204 386 A1.
Eine weitere Möglichkeit die Steifigkeit des zentralen Kuppelteils zu erhöhen, besteht in einer besonderen Formgebung dieses Teils, z.B. durch eine zentrale Vertiefung, wie dies aus der Fig. 1 der EP 0 137 624 A2 ersichtlich ist. In der DE 43 29 637 Al wird die Ausformung von Rippen beschrieben. Der zentrale Kuppelteil wird zuerst größer als gewünscht hergestellt und anschließend in einem zweiten Verformungsprozeß mit zufällig entstehenden Versteifungsrippen versehen.Another possibility to increase the stiffness of the central dome part is by a special shape of this part, e.g. through a central depression, as can be seen from FIG. 1 of EP 0 137 624 A2. DE 43 29 637 A1 describes the formation of ribs. The central dome part is first made larger than desired and then provided in a second deformation process with randomly occurring stiffening ribs.
Die erwähnten Methoden sind zeit- und daher kostenaufwendig. Die vorliegende Erfindung hat es sich zum Ziel gesetzt, diese Nachteile zu vermeiden und ein einfaches, genau definierbares Herstellungsverfahren für Membranen mit verschieden dicken Teilbereichen anzugeben, die für elektrodynamische Wandler mit Vorteil verwendet werden können.The methods mentioned are time-consuming and therefore costly. The present invention has set itself the goal of avoiding these disadvantages and of providing a simple, precisely definable production method for membranes with sub-regions of different thicknesses which can be used advantageously for electrodynamic transducers.
Die Membran mit verschieden dicken Teilbereichen wird erfindungsgemäß durch einen mehrstufigen thermoplastischen Prägeprozeß aus einem Material konstanter Dicke hergestellt. In einem ersten Arbeitsgang wird jener Bereich des Membranmaterials, der in der fertig erstellten Membran eine größere Dicke aufweisen soll, durch eine innere Fixiervorrichtung gehalten, während der restliche Bereich zusätzlich durch eine äußere Fixiervorrichtung gehalten und unter Einwirkung von Zug und Wärme auf eine geringere Dicke vorgezogen wird. In einem zweiten Arbeitsgang wird dann die gesamte Membran thermoplastisch in einer Form geprägt.According to the invention, the membrane with different thickness partial areas is produced from a material of constant thickness by a multi-stage thermoplastic embossing process. In a first operation, that area of the membrane material which is to have a greater thickness in the finished membrane is held by an inner fixing device, while the remaining area is additionally held by an outer fixing device and is drawn to a smaller thickness under the action of tension and heat becomes. In a second step, the entire membrane is embossed in one mold.
Nach einem weiteren Merkmal der Erfindung wird aus dem fixierten Bereich des Membranmaterials die Kuppel und aus dem restlichen vorgezogenen Bereich des Membranmaterials die Sickenzone geprägt.According to a further feature of the invention, the dome is embossed from the fixed area of the membrane material and the bead zone from the remaining preferred area of the membrane material.
Schließlich ist es auch noch vorteilhaft, wenn alle Herstellvorgänge in einem einzigen Werkzeug durchgeführt werden.Finally, it is also advantageous if all manufacturing processes are carried out in a single tool.
Das erfindungsgemäße Verfahren wird nun an Hand der Zeichnungen näher erläutert u.zw. zeigen Fig. 1 im Querschnitt die komplette Membran mit Tauchspule für einen elektrodynamischen Wandler, Fig. 2 schematisch die innere und äußere Fixiervorrichtung mit dem eingelegten Membranmaterial, Fig. 3 im Querschnitt, wie durch die Relativbewegung zwischen innerer und äußerer Fixiervorrichtung eine Dehnung des Membranmaterials zustande kommt, Fig. 4 im Querschnitt das vorgezogene Membranmaterial mit dem deutlich dickeren Mitteilteil und Fig. 5 die fertige erfindungsgemäße Membran eines elektrodynamischen Wandlers im Querschnitt.The method according to the invention will now be explained in more detail with reference to the drawings, etc. 1 shows in cross section the complete membrane with plunger coil for an electrodynamic transducer, FIG. 2 shows schematically the inner and outer fixing device with the inserted membrane material, 4 shows in cross section the preferred membrane material with the much thicker central part and FIG. 5 shows the finished membrane of an electrodynamic transducer according to the invention in cross section.
Fig. 1 zeigt das Schnittbild einer kompletten Membran mit der Tauchspule für einen elektrodynamischen Wandler. Der zentrale Kuppelbereich 1 ist von einem toroidförmigen Teil 2 umgeben. Zur Befestigung am - nicht dargestellten Magnetsystem - dient der äußere Membranrand 3. Die Tauchspule 4 wird mit der Membran verklebt. Der Durchmesser der Tauchspule 4 entspricht dabei etwa dem äußeren Durchmesser des zentralen Kuppelbereichs 1.Fig. 1 shows the sectional view of a complete membrane with the moving coil for an electrodynamic converter. The central dome area 1 is surrounded by a
Unter Bezugnahme auf die folgenden Figuren und die dort bezeichneten Einzelheiten wird nun das erfindungsgemäße Herstellungsverfahren näher beschrieben.With reference to the following figures and the details designated there, the manufacturing method according to the invention will now be described in more detail.
Das Membranmaterial 5, das üblicherweise in Folienform vorliegt, wird zuerst wie in Fig. 2 schematisch dargestellt, in eine erste Vorrichtung eingeführt, die aus einer inneren 6, 6' und einer äußeren 7, 7' Fixiervorrichtung besteht. Die innere Fixiervorrichtung 6, 6' umfaßt dabei jenen zentralen Breich 8, der in der fertig erstellten Membran eine größere Dicke aufweisen soll. Dieser Bereich wird bei der Membran eines elektrodynamischen Wandlers kreisförmig den Kuppelbereich 1 umfassen. Die äußere Fixiervorrichtung 7, 7' umschließt einen Bereich, der etwa dem doppelten Durchmesser der fertig erstellten Membran entspricht.The
Die Fixiervorrichtungen bestehen aus je zwei Backen 6, 6' bzw. 7, 7', die oberhalb und unterhalb des Membranmaterials 5 angeordnet sind. Diese beiden Backen 6, 6' und 7, 7' werden so fest zusammengedrückt, daß das dazwischenliegende Membranmaterial 5 unverrückbar fest gehalten wird. Um zu verhindern, daß das Membranmaterial während des Fixierens beschädigt wird, können die beiden Backen zusätzlich noch mit elastischen Dichtelementen 12, 12' bzw. 13, 13' versehen werden.The fixing devices each consist of two
Durch eine Relativbewegung zwischen innerer 6, 6' und äußerer 7, 7' Fixiervorrichtung sowie durch Einwirkung von Wärme kann der ringförmige Randbereich 9 zwischen innerer 6, 6' und äußerer 7, 7' Fixiervorrichtung in der Dicke verringert werden, wie dies in Fig. 3 schematisch dargestellt ist.By a relative movement between the inner 6, 6 'and outer 7, 7' fixing device and by the action of heat, the
Diese Verringerung der Materialstärke wird umso höher ausfallen, je größer die Relativbewegung zwischen innerer 6, 6' und äußerer 7, 7' Fixiervorrichtung ist. Durch geeignete Wahl der Bewegungsparameter hat man daher ein geeignetes Mittel in der Hand, eine gewünschte Dicke des ringförmigen Randbereichs 9 herzustellen.This reduction in the material thickness will be greater the greater the relative movement between the inner 6, 6 'and the outer 7, 7' fixing device. A suitable choice of the movement parameters therefore provides a suitable means for producing a desired thickness of the
Die Zuführung der für das Vorziehen des Membranmaterials 5 notwendigen Wärme kann durch Luft oder durch Strahlung erfolgen. Im ersten Fall wird das Membranmaterial 5 mit Warmluft direkt erhitzt, im zweiten Fall werden umgebende Teile, etwa die massiven Teile der Fixiervorrichtungen elektrisch erwärmt und bestrahlen ihrerseits das Membranmaterial 5.The heat necessary for pulling forward the
Dabei ist es vorteilhaft, wenn die Wärmezufuhr so erfolgt, daß vorzugsweise jene Teilbereiche des Membranmaterials erwärmt werden, deren Dicke verringert werden soll. Es ist aber auch denkbar, daß ein Membranmaterial 5 verwendet wird, das kalt gezogen werden kann. In diesem Fall kann eine Erwärmung gänzlich entfallen.It is advantageous if the supply of heat is carried out in such a way that those portions of the membrane material whose thickness is to be reduced are preferably heated. But it is also conceivable that a
Die Fig. 4 zeigt das Ergebnis dieses ersten Arbeitsganges, nämlich eine Membranfolie, die in ihrem zentralen Bereich 8 dicker ist als in ihrem Randbereich 9.FIG. 4 shows the result of this first operation, namely a membrane film that is thicker in its
In einem zweiten Arbeitsgang wird diese Folie nun mittels einer üblichen Membranform geprägt und ausgestanzt. Fig. 5 zeigt eine fertige ausgestanzte Membran, deren Kuppel 10 wesentlich dicker als deren Sickenzone 11 ist. Dickenunterschiede zwischen Kuppel und Sickenzone von ca. 50 % konnten auf diese Weise realisiert werden.In a second step, this film is then embossed and punched out using a conventional membrane shape. Fig. 5 shows a finished punched membrane, the
Besonders wirkungsvoll wird dieses Herstellverfahren dann angewendet, wenn beide Arbeitsgänge in einem einzigen Werkzeug durchgeführt werden. Äußere und innere Fixiervorrichtung sowie die endgültige Prägeform können miteinander kombiniert und axial gegeneinander beweglich angeordnet werden, so daß mittels einer geeigneten Steuereinrichtung das erfindungsgemäße Herstellungsverfahren automatisch ablaufen kann.This manufacturing process is used particularly effectively when both operations are carried out in a single tool. The outer and inner fixing device and the final embossing mold can be combined with one another and arranged to be axially movable relative to one another, so that the manufacturing method according to the invention can run automatically by means of a suitable control device.
Dadurch ist es möglich, mit praktisch dem gleichen Arbeitsaufwand, der für die Herstellung einer üblichen Membran notwendig ist, eine Membran herzustellen, die ungleich dicke Teilbereiche aufweist. Es können dadurch Membranen für elektroakustische Wandler preisgünstig hergestellt werden, die eine dicke Kuppelzone und eine dünnere Sickenzone besitzen, was deren Schwingungsverhalten deutlich verbessert.This makes it possible, with practically the same amount of work required to produce a conventional membrane, to produce a membrane which has sections of unequal thickness. As a result, membranes for electroacoustic transducers can be produced inexpensively, which have a thick dome zone and a thinner bead zone, which significantly improves their vibration behavior.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT97890105T ATE309686T1 (en) | 1996-06-19 | 1997-06-18 | METHOD FOR PRODUCING A MEMBRANE FOR AN ELECTROACOUSTIC TRANSDUCER |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT108596 | 1996-06-19 | ||
| AT1085/96 | 1996-06-19 | ||
| AT0108596A AT403751B (en) | 1996-06-19 | 1996-06-19 | METHOD FOR PRODUCING A MEMBRANE FOR AN ELECTROACOUSTIC TRANSDUCER |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0814637A2 true EP0814637A2 (en) | 1997-12-29 |
| EP0814637A3 EP0814637A3 (en) | 2004-09-15 |
| EP0814637B1 EP0814637B1 (en) | 2005-11-09 |
Family
ID=3506264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97890105A Expired - Lifetime EP0814637B1 (en) | 1996-06-19 | 1997-06-18 | Method for producing a diaphragm for an electroacoustic transducer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6185809B1 (en) |
| EP (1) | EP0814637B1 (en) |
| JP (1) | JP3927651B2 (en) |
| AT (2) | AT403751B (en) |
| DE (1) | DE59712472D1 (en) |
| DK (1) | DK0814637T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1207719A2 (en) | 2000-11-20 | 2002-05-22 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker, diaphragm and making process for diaphragm |
| CN1596032B (en) * | 2003-09-11 | 2011-05-11 | Akg声学有限公司 | Dynamic converter |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3597061B2 (en) * | 1998-11-13 | 2004-12-02 | 日本電気株式会社 | Piezo speaker |
| KR100338785B1 (en) * | 1999-05-28 | 2002-05-31 | 허 훈 | Manufacturing Method of Diaphragm for Dynamic Receiver of Cellular Phone |
| WO2005084076A1 (en) | 2004-02-17 | 2005-09-09 | Koninklijke Philips Electronics N.V. | Method of and device for modifying the properties of a membrane for an electroacoustic transducer |
| EP1694094A1 (en) * | 2005-02-18 | 2006-08-23 | AKG Acoustics GmbH | Membrane for a dynamic converter |
| US20070261912A1 (en) * | 2006-05-11 | 2007-11-15 | Altec Lansing Technologies, Inc. | Integrated audio speaker surround |
| CN102868959B (en) * | 2012-10-12 | 2015-01-21 | 张百良 | Aluminium strip speaker |
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| GB1277023A (en) * | 1968-08-27 | 1972-06-07 | Emi Ltd | Improvements in or relating to diaphragms |
| DE2238831A1 (en) * | 1971-08-11 | 1973-02-22 | Shell Int Research | THERMOPLASTIC HOLLOW SHAPED PART AND PROCESS FOR ITS MANUFACTURING |
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| GB1219918A (en) * | 1968-08-08 | 1971-01-20 | Standard Telephones Cables Ltd | Improvements in and relating to moving coil transducers |
| US3586792A (en) * | 1970-02-24 | 1971-06-22 | Int Standard Electric Corp | Method for assembling electro-acoustical transducer diaphragm assemblies |
| JPS53119023A (en) * | 1977-03-26 | 1978-10-18 | Kenzou Inoue | Moving coil type sound converting vibration plate |
| JPS555168A (en) * | 1978-06-27 | 1980-01-16 | Matsushita Electric Ind Co Ltd | Production of diaphragm for speaker |
| GB2062405B (en) * | 1979-10-20 | 1983-07-20 | Plessey Co Ltd | Acoustic transducer production for telephones |
| US5033093A (en) | 1990-01-17 | 1991-07-16 | Peavey Electronics Corporation | Compact microphone and method of manufacture |
| JPS56141697A (en) * | 1980-04-08 | 1981-11-05 | Mitsubishi Electric Corp | Preparation of vibration diaphragm for speaker |
| JPS58157293A (en) * | 1982-03-15 | 1983-09-19 | Mitsubishi Electric Corp | Diaphragm for speaker |
| JPS58157294A (en) * | 1982-03-15 | 1983-09-19 | Mitsubishi Electric Corp | Diaphragm for speaker |
| JPS5927697A (en) * | 1982-08-04 | 1984-02-14 | Sanyo Electric Co Ltd | Join method of speaker diaphragm and edge |
| JPS59190799A (en) * | 1983-04-14 | 1984-10-29 | Onkyo Corp | Fitting method of diaphragm edge |
| GB2145300B (en) | 1983-08-16 | 1987-05-07 | Standard Telephones Cables Ltd | Electroacoustic transducer |
| NL8501650A (en) | 1985-06-07 | 1987-01-02 | Philips Nv | ELECTRODYNAMIC CONVERTER WITH A TWO-PIECE MEMBRANE. |
| DE3852156T2 (en) * | 1987-03-04 | 1995-05-11 | Hosiden Corp | MEMBRANE UNIT OF AN ELECTROSTATIC MICROPHONE, A METHOD FOR THEIR PRODUCTION AND AN ELECTROSTATIC MICROPHONE. |
| JPH0715793A (en) * | 1993-06-28 | 1995-01-17 | Sony Corp | Diaphragm for speaker and its molding method |
| DE4329637A1 (en) | 1993-09-02 | 1995-03-09 | Sennheiser Electronic | Method for producing a contoured diaphragm for electroacoustic transducers such as headphones, and a transducer diaphragm produced in accordance with this method |
-
1996
- 1996-06-19 AT AT0108596A patent/AT403751B/en not_active IP Right Cessation
-
1997
- 1997-06-18 EP EP97890105A patent/EP0814637B1/en not_active Expired - Lifetime
- 1997-06-18 DE DE59712472T patent/DE59712472D1/en not_active Expired - Lifetime
- 1997-06-18 JP JP16085297A patent/JP3927651B2/en not_active Expired - Lifetime
- 1997-06-18 AT AT97890105T patent/ATE309686T1/en active
- 1997-06-18 DK DK97890105T patent/DK0814637T3/en active
- 1997-06-19 US US08/878,919 patent/US6185809B1/en not_active Expired - Lifetime
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|---|---|---|---|---|
| GB1277023A (en) * | 1968-08-27 | 1972-06-07 | Emi Ltd | Improvements in or relating to diaphragms |
| DE2238831A1 (en) * | 1971-08-11 | 1973-02-22 | Shell Int Research | THERMOPLASTIC HOLLOW SHAPED PART AND PROCESS FOR ITS MANUFACTURING |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1207719A2 (en) | 2000-11-20 | 2002-05-22 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker, diaphragm and making process for diaphragm |
| EP1207719A3 (en) * | 2000-11-20 | 2006-11-02 | Matsushita Electric Industrial Co., Ltd. | Loudspeaker, diaphragm and making process for diaphragm |
| CN1596032B (en) * | 2003-09-11 | 2011-05-11 | Akg声学有限公司 | Dynamic converter |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE309686T1 (en) | 2005-11-15 |
| ATA108596A (en) | 1997-09-15 |
| US6185809B1 (en) | 2001-02-13 |
| AT403751B (en) | 1998-05-25 |
| JP3927651B2 (en) | 2007-06-13 |
| EP0814637A3 (en) | 2004-09-15 |
| EP0814637B1 (en) | 2005-11-09 |
| DE59712472D1 (en) | 2005-12-15 |
| JPH1070794A (en) | 1998-03-10 |
| DK0814637T3 (en) | 2006-03-20 |
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