EP0615398B1 - Electroacoustic transducer having a mask - Google Patents

Electroacoustic transducer having a mask Download PDF

Info

Publication number
EP0615398B1
EP0615398B1 EP94200416A EP94200416A EP0615398B1 EP 0615398 B1 EP0615398 B1 EP 0615398B1 EP 94200416 A EP94200416 A EP 94200416A EP 94200416 A EP94200416 A EP 94200416A EP 0615398 B1 EP0615398 B1 EP 0615398B1
Authority
EP
European Patent Office
Prior art keywords
mask
transducer
partition
openings
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94200416A
Other languages
German (de)
French (fr)
Other versions
EP0615398A1 (en
Inventor
Peter Bleim
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0615398A1 publication Critical patent/EP0615398A1/en
Application granted granted Critical
Publication of EP0615398B1 publication Critical patent/EP0615398B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/025Magnetic circuit

Definitions

  • the invention relates to an electroacoustic transducer a membrane that is designed to vibrate parallel to a transducer axis, and with a partition that is opposite the membrane rear and essentially runs transversely to the transducer axis and in the at least one penetrating it Wall opening to form a connection between one between the membrane and one side of the partition, the first room and one on the other Side of the partition lying second room is provided, and with a mask that is arranged adjacent to one of the two sides of the partition and in the at least one mask opening penetrating them to form the connection between the two rooms is provided, whereby to achieve different sizes acoustically effective cross-sectional areas of the connection between the two rooms, which at least partially overlap in the direction of the transducer axis bringable openings are formed in the partition and in the mask, the partition and the mask rotated in at least two with respect to the transducer axis Relative positions can be brought and held, and with a magnet system that has at least one magnet system part.
  • An electroacoustic transducer according to that in the first paragraph above cited genus is known for example from US-A 4 027 116.
  • the mask is formed by an annular disc on the the cylindrical outer peripheral surface of a cup-shaped magnet system part of the Magnet system of the transducer is pushed on and also on an annular Partition provided as a holder for the membrane and the magnet system Frame of the converter rests and by rotating it around the converter axis coaxial pot-shaped magnet system part in three different relative positions can be brought opposite the partition.
  • the known converter that is as an annular Disk-formed mask formed by a separate component, which as additional component represents an additional effort and its assembly additional Assembly steps and assembly costs required. Through the additional component additional tolerance influences are also caused, which adversely affect the Reproducibility of the acoustic behavior of the transducer affect.
  • the invention has set itself the task of a converter in the first Paragraph cited in his training to simplify both the genus To reduce manufacturing costs, which is particularly the case with mass production of a such transducer is important, as well as to improve to adverse tolerance effects on the reproducibility of the acoustic behavior of the transducer turn off.
  • the invention is characterized in that the magnet system part of the magnet system is essentially transverse to the transducer axis Has flange and that the flange of the magnet system part with at least one Mask provided mask of the converter forms.
  • the mask of a converter according to the invention not through a separate component, but through a component of an already existing component of such Converter is formed, which in terms of low component costs and in particular with regard to the fewest possible assembly steps and the lowest possible assembly costs is an advantage.
  • the latter advantages are particularly important in mass production of great importance, because with a simple assembly line, Aus Siemens is found. Since the mask in a converter according to the invention a component of a component of the transducer is formed by the mask causes no additional tolerance influences, which means good reproducibility the acoustic behavior of the transducer is advantageous.
  • the partition and the mask can be in such positions relative to each other be feasible that a connection in each relative position using the two openings between the two rooms with a double-convex effective cross-sectional area is formed, the surface area and therefore acoustic inductance and friction depending on Relative positions are of different sizes and therefore have different frequency characteristics lead of the transducer, but then the effective cross-sectional areas and consequently, the frequency characteristics of position tolerances between the Partition and the mask are dependent.
  • each opening with a smaller one Cross-sectional area has a circular cross-section and the diameter of each such opening with a circular cross section in its acoustically effective Cross-sectional area is less than 0.3 mm.
  • Such openings or holes with small Diameters are very accurate in compliance with specified dimensions very small tolerances can be produced, so that precisely defined openings of this type by the ratio of the acoustically effective cross-sectional area and length of the opening certain acoustic inductance values and resistance values and thus exactly defined influences of the connections formed with the help of the openings between the both rooms of the transducer can be achieved on the acoustic behavior of the transducer.
  • each such Opening with a circular cross section in its axial direction, parallel to the transducer axis, a conical Training.
  • This is accurate in terms of one Defined definition of the acoustically effective cross-sectional area of such an opening advantageous, which focuses on the area of the smallest diameter of the opening is. Furthermore, this is in view of the good manufacturability of such an opening in a plastic part advantageous, because of the easy release.
  • FIG. 1 shows in a cross section along the line I-I in Fig. 2 on a larger scale compared to the natural size in a somewhat schematic Way an electrodynamic converter according to a first embodiment the invention, in which a mask of the transducer against a partition of the Converter takes a first relative position.
  • Fig. 2 shows in a section according to the Line II-II in FIG. 1 shows the converter according to FIG. 1.
  • FIG. 3 shows in an analogous manner how Fig. 1 in a cross section along the line III-III in Fig. 4 is an electrodynamic Converter according to a second embodiment of the invention, which in has essentially the same structure as the converter of FIG.
  • FIG. 4 shows a section along the line IV-IV in FIG. 3 the converter according to FIG. 3.
  • FIG. 5 shows a cross section in one opposite Figures 1 and 3 larger scale a detail of an electrodynamic Converter according to a third embodiment of the invention, which is essentially has the same structure as the converter according to Figures 3 and 4, but in its partition has conical wall openings.
  • the converter 1 has an essentially circular or hollow-cylindrical holding device 2.
  • the holding device 2 has one circular outer wall 3, which in its one front of the transducer 1st facing area is provided with a gradation 4.
  • the gradation 4 forms one Holding zone on which a membrane 5 of the transducer 1 by means of an adhesive connection is attached.
  • the membrane 5 has a central area (middle area) 6, which is often also as Cathedral is called.
  • the membrane 5 has a peripheral edge region 7 on, in which hyperbolic beads are provided, which is not the case in FIG. 1 is recognizable.
  • the membrane 5 With the free end 8 of the edge region 7, the membrane 5 is on the Gradation 4 of the holding device 2 attached by gluing.
  • the membrane 5 is parallel to a transducer axis 9 back and forth designed to vibrate and they radiates audible useful vibrations on the membrane front side 10 during operation.
  • a voice coil 12 In the transition area 11 between the middle area 6 and the The edge region 7 of the membrane 5 is a voice coil 12 by means of the membrane 5 an adhesive bond connected.
  • the voice coil 12 projects here with its from the Area 14 facing away from membrane rear side 13 into an air gap 15 of a magnet system 16 of the transducer 1.
  • the magnet system 16 has a magnet 17 and one Pole plate 18 and a pot 19, which is often referred to as an outer pot.
  • the holding device 2 has one of the outer wall 3 to protrude inward in radial directions, substantially circular partition 24, which in this case the membrane rear 13 of the Diaphragm 5 is opposite and extends transversely to the transducer axis 9.
  • the partition 24 is with four evenly spaced 90 ° to each other, the partition 24 penetrating, essentially having a slit-shaped cross-sectional area Wall openings 25, 26, 27 and 28 provided.
  • the partition 24 is four each offset by 90 ° to each other and 45 ° to the slot-shaped wall openings 25, 26, 27 and 28 arranged at an angle, likewise the partition 24 penetrating wall openings 29 having a circular cross-sectional area, 30, 31 and 32 provided.
  • the wall openings 25, 26, 27, 28 and 29, 30, 31, 32 are to form connections between one between the membrane 5 and the one Page 33 of the partition 24 lying room 34 and one on the other side 35 of the Partition 24 lying room 36 is provided.
  • the room 36 for The rear of the converter 1 is open.
  • the slit-shaped Wall openings 25, 26, 27 and 28 have a length of about 6 mm.
  • the circular wall openings 29, 30, 31 and 32 have a diameter of less than 0.3 mm and preferably of 0.2 mm.
  • the circular wall openings can also have a diameter of, for example have only 50 or 40 ⁇ m.
  • the present converter 1 according to the Figures 1 and 2 have the circular wall openings 29, 30, 31 and 32 in their axial direction on a cylindrical formation.
  • the converter 1 also has one on the side 35 of the partition 24 adjacently arranged and in this case in contact with the partition 24 mask (flange) 37.
  • the mask 37 is arranged with four, each offset by 90 ° to each other Passing mask 37, having a slit-shaped cross-sectional area
  • Mask openings 38, 39, 40 and 41 provided to form the connections are provided between the two rooms 34 and 36.
  • the slit-shaped mask openings 38, 39, 40 and 41 a length of about 5 mm and have a width of about 2.2 mm.
  • the converter 1 has the Pot 19 of the magnet system 16 has a flange 37 running transversely to the transducer axis 9 with which the pot 19 for fastening the entire magnet system 16 to the Partition 24 is glued, namely along a self-contained, in essentially circular, located in the outer region of the flange 37
  • Adhesive connection 42 the inner boundary 43 in Fig. 2 with a dash-dotted line Line is indicated schematically.
  • Such an adhesive connection 42 has in practice of course, a limit 43 that does not have such an exactly circular Has course.
  • the flange 37 of the pot 19 of the magnet system 16 not only forms a fastening part for fastening the magnet system 16 to the holding device 2, but also in a particularly simple and very advantageous manner Mask 37 of the converter 1.
  • the mask 37 of the converter 1 not by a separate component, but by a component of one anyway existing component of the converter 1, namely through the flange 37 of the Pot 19 of the magnet system 16 of the transducer 1 is formed.
  • This is regarding lower component costs and especially with regard to the fewest possible assembly steps and the lowest possible installation costs are an advantage.
  • Assembly steps and assembly costs are such in mass production electrodynamic converter 1 of great importance because it makes it easier built assembly line the Ausmaschine is found.
  • Flange of the pot formed mask causes no additional tolerance influences, what about good reproducibility of the acoustic behavior of the transducer 1 is advantageous.
  • FIGS. 3 and 4 An electrodynamic converter 1 is shown in FIGS shown a second embodiment of the invention, which as a hearing or Speech capsule for telecommunications applications, in particular telephony applications, is trained.
  • the converter 1 according to FIGS. 3 and 4 essentially has the same structure as the converter 1 according to Figures 1 and 2. Differently compared to the converter 1 according to FIGS. 1 and 2, the converter 1 according to FIGS 3 and 4, however, that the space 36 on the other side 35 of the partition 24th is completed.
  • a closing part 44 is provided for closing off the room 36, which is plate-shaped.
  • the end part 44 has an opening 45 provided, which in the present case has a circular cross section and with which the end part 44 with an acoustically tight fit on the outer peripheral surface 46 of the pot 19 of the magnet system 16 is placed.
  • the end part 44 has an edge region 47 surrounding the opening 45, with which the end part 44 with the outer wall 3 of the holding device 2 acoustically tight and mechanically firm connected is.
  • the holding device 2 or its outer wall 3 thus forms the present converter 1 a space boundary part for delimiting space 36.
  • the holding device 2 and the end part 44 consist of the same Plastic material and are mechanically strong thanks to an ultrasonic welding connection connected with each other.
  • the end part 44 is open particularly simple way only by means of a mechanical press fit with the pot 19 of the Magnet system 16 connected to its outer peripheral surface 46.
  • the partition wall 24 and the mask 37 have a different relative position to one another than is the case with the converter 1 according to FIGS. 1 and 2 is the case.
  • the converter 1 according to FIGS. 3 and 4 take the partition 24 and the mask 37, ie the flange 37 of the pot 19th of the magnet system 16, a relative position to one another in which the circular Wall openings 29, 30, 31 and 32 with the slit-shaped mask openings 38, 39, 40 and cover 41.
  • the mask 37 of the converter 1 is also by a component of an existing component of such a transducer, which - as already mentioned - with regard to low component costs and in particular with regard to as few assembly steps as possible and as low as possible assembly costs and one good reproducibility of the acoustic behavior of such a transducer is an advantage is.
  • FIG. 5 shows a detail of an electrodynamic converter 1 according to FIG a third embodiment of the invention shown, as well as the Transducer 1 according to FIGS. 3 and 4 as a hearing or speaking capsule for telecommunication applications is trained.
  • each has Opening 29, 30, 31 and 32 with a circular cross-section, of which in Fig. 5th only the opening 30 is shown, in its axial direction a conical configuration on.
  • This is in terms of a precisely defined definition of the acoustically effective Cross-sectional area of such an opening advantageous to the area of the smallest
  • the diameter of the opening is concentrated, that is, in the present case, the converter 1 5 to the end region of the openings 29 facing away from the mask 37, 30, 31 and 32.
  • the invention is based on the three transducers described above Embodiments not limited.
  • it can be used as a mask provided flange of the pot of one of the three transducers described provided core pot magnet system also on the side facing the membrane abut a partition of such a holding device.
  • Another can also Magnet system as a pot core magnet system in a transducer according to the invention are used, for example a toroidal magnet system.
  • in the partition more than two different types of wall openings be provided with, for example, more than one type of mask openings in a mask formed by a flange in different relative positions the partition and the mask can be brought to cover each other.
  • Also instead of in one area of the partition, only one opening with a circular To provide a cross section with a small diameter, including two or more Openings with a circular cross section with even smaller diameters are provided be.

Landscapes

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

Description

Die Erfindung bezieht sich auf einen elektroakustischen Wandler mit einer Membran, die parallel zu einer Wandlerachse schwingungsfähig ausgebildet ist, und mit einer Trennwand, die der Membranhinterseite gegenüberliegt und im wesentlichen quer zur Wandlerachse verläuft und in der mindestens eine sie durchsetzende Wandöffnung zur Bildung einer Verbindung zwischen einem zwischen der Membran und der einen Seite der Trennwand liegenden ersten Raum und einem an der anderen Seite der Trennwand liegenden zweiten Raum vorgesehen ist, und mit einer Maske, die an eine der beiden Seiten der Trennwand angrenzend angeordnet ist und in der mindestens eine sie durchsetzende Maskenöffnung zur Bildung der Verbindung zwischen den beiden Räumen vorgesehen ist, wobei zum Erzielen von unterschiedlich großen akustisch wirksamen Querschnittsflächen der Verbindung zwischen den beiden Räumen, die durch die in Richtung der Wandlerachse zumindest teilweise zur Überdeckung bringbaren Öffnungen in der Trennwand und in der Maske gebildet sind, die Trennwand und die Maske in zumindest zwei bezüglich der Wandlerachse zueinander verdrehte Relativlagen bringbar und festhaltbar sind, und mit einem Magnetsystem, das mindestens einen Magnetsystemteil aufweist. The invention relates to an electroacoustic transducer a membrane that is designed to vibrate parallel to a transducer axis, and with a partition that is opposite the membrane rear and essentially runs transversely to the transducer axis and in the at least one penetrating it Wall opening to form a connection between one between the membrane and one side of the partition, the first room and one on the other Side of the partition lying second room is provided, and with a mask that is arranged adjacent to one of the two sides of the partition and in the at least one mask opening penetrating them to form the connection between the two rooms is provided, whereby to achieve different sizes acoustically effective cross-sectional areas of the connection between the two rooms, which at least partially overlap in the direction of the transducer axis bringable openings are formed in the partition and in the mask, the partition and the mask rotated in at least two with respect to the transducer axis Relative positions can be brought and held, and with a magnet system that has at least one magnet system part.

Ein elektroakustischer Wandler gemäß der vorstehend im ersten Absatz angeführten Gattung ist beispielsweise aus der US-A 4 027 116 bekannt. Bei diesem bekannten Wandler ist die Maske durch eine kreisringförmige Scheibe gebildet, die auf die zylindrische Außenumfangsfläche eines topfförmigen Magnetsystemteiles des Magnetsystems des Wandlers aufgeschoben ist und die an einer ebenfalls kreisringförmigen Trennwand eines als Halter für die Membran und das Magnetsystem vorgesehenen Rahmens des Wandlers anliegt und die hierbei durch Verdrehen um den zur Wandlerachse koaxialen topfförmigen Magnetsystemteil in drei unterschiedliche Relativlagen gegenüber der Trennwand bringbar ist. Bei dem bekannten Wandler ist die als kreisringförmige Scheibe ausgebildete Maske durch einen separaten Bauteil gebildet, der als zusätzlicher Bauteil einen zusätzlichen Aufwand darstellt und dessen Montage zusätzliche Montageschritte und Montagekosten erfordert. Durch den zusätzlichen Bauteil werden außerdem additionelle Toleranzeinflüsse verursacht, die sich nachteilig auf die Reproduzierbarkeit des akustischen Verhaltens des Wandlers auswirken. An electroacoustic transducer according to that in the first paragraph above cited genus is known for example from US-A 4 027 116. With this known transducer, the mask is formed by an annular disc on the the cylindrical outer peripheral surface of a cup-shaped magnet system part of the Magnet system of the transducer is pushed on and also on an annular Partition provided as a holder for the membrane and the magnet system Frame of the converter rests and by rotating it around the converter axis coaxial pot-shaped magnet system part in three different relative positions can be brought opposite the partition. In the known converter that is as an annular Disk-formed mask formed by a separate component, which as additional component represents an additional effort and its assembly additional Assembly steps and assembly costs required. Through the additional component additional tolerance influences are also caused, which adversely affect the Reproducibility of the acoustic behavior of the transducer affect.  

Die Erfindung hat sich zur Aufgabe gestellt, einen Wandler der im ersten Absatz angeführten Gattung in seiner Ausbildung sowohl zu vereinfachen, um die Herstellungskosten zu vermindern, was insbesondere bei einer Massenproduktion eines solchen Wandlers von Wichtigkeit ist, als auch zu verbessern, um nachteilige Toleranzeinflüsse auf die Reproduzierbarkeit des akustischen Verhaltens des Wandlers auszuschalten. Hierfür ist die Erfindung dadurch gekennzeichnet, daß der Magnetsystemteil des Magnetsystems einen im wesentlichen quer zur Wandlerachse verlaufenden Flansch aufweist und daß der Flansch des Magnetsystemteiles die mit mindestens einer Maskenöffnung versehene Maske des Wandlers bildet. Auf diese Weise ist erreicht, daß die Maske eines erfindungsgemäßen Wandlers nicht durch einen separaten Bauteil, sondern durch einen Bestandteil eines ohnehin vorhandenen Bauteiles eines solchen Wandlers gebildet ist, was hinsichtlich niedriger Bauteilkosten und insbesondere hinsichtlich von möglichst wenigen Montageschritten und möglichst geringen Montagekosten von Vorteil ist. Letztere Vorteile sind bei einer Massenproduktion von besonders großer Bedeutung, weil dadurch mit einer einfacher aufgebauten Montagestraße das Auslangen gefunden wird. Da die Maske bei einem erfindungsgemäßen Wandler durch einen Bestandteil eines Bauteiles des Wandlers gebildet ist, werden durch die Maske keine additionellen Toleranzeinflüsse verursacht, was hinsichtlich einer guten Reproduzierbarkeit des akustischen Verhaltens des Wandlers vorteilhaft ist. The invention has set itself the task of a converter in the first Paragraph cited in his training to simplify both the genus To reduce manufacturing costs, which is particularly the case with mass production of a such transducer is important, as well as to improve to adverse tolerance effects on the reproducibility of the acoustic behavior of the transducer turn off. For this, the invention is characterized in that the magnet system part of the magnet system is essentially transverse to the transducer axis Has flange and that the flange of the magnet system part with at least one Mask provided mask of the converter forms. In this way it is achieved that the mask of a converter according to the invention not through a separate component, but through a component of an already existing component of such Converter is formed, which in terms of low component costs and in particular with regard to the fewest possible assembly steps and the lowest possible assembly costs is an advantage. The latter advantages are particularly important in mass production of great importance, because with a simple assembly line, Auslangen is found. Since the mask in a converter according to the invention a component of a component of the transducer is formed by the mask causes no additional tolerance influences, which means good reproducibility the acoustic behavior of the transducer is advantageous.

Beispielsweise können in der Trennwand und in der Maske je zwei Öffnungen mit kreisförmigem Querschnitt und relativ großem Durchmesser vorgesehen sein und die Trennwand und die Maske können in solche Relativlagen zueinander bringbar sein, daß in jeder Relativlage mit Hilfe der beiden Öffnungen eine Verbindung zwischen den beiden Räumen mit einer doppelt-konvexen wirksamen Querschnittsfläche gebildet ist, deren Flächeninhalte und daher akustische Induktivität und Reibung je nach Relativlage unterschiedlich groß sind und daher zu unterschiedlichen Frequenzcharakteristiken des Wandlers führen, wobei aber dann die wirksamen Querschnittsflächen und folglich die Frequenzcharakteristiken relativ stark von Lagetoleranzen zwischen der Trennwand und der Maske abhängig sind. Als vorteilhaft hat sich erwiesen, wenn zumindest zwei der die Trennwand durchsetzenden Wandöffnungen hinsichtlich ihrer Querschnittsfläche unterschiedlich sind und eine der in dem Flansch vorgesehenen Maskenöffnungen in der einen Relativlage sich mit einer der unterschiedlichen Wandöffnungen zur Bildung einer Verbindung zwischen den beiden Räumen und in der anderen Relativlage sich mit der anderen der unterschieldlichen Wandöffnungen zur Bildung einer anderen Verbindung zwischen den beiden Räumen überdeckt. Auf diese Weise ist ein besonders einfaches und genau definiertes, von Lagetoleranzen praktisch unabhängiges Verändern der Frequenzcharakteristiken eines solchen Wandlers erreicht, weil je nach Relativlage der Trennwand und der Maske durch Öffnungsquerschnitte genau definierte akustisch wirksame Querschnittsflächen der die beiden Räume verbindenden Verbindungen, die akustische Induktivitäten und Widerstände bilden, realisiert sind. For example, there can be two in the partition and one in the mask Openings with a circular cross section and a relatively large diameter are provided and the partition and the mask can be in such positions relative to each other be feasible that a connection in each relative position using the two openings between the two rooms with a double-convex effective cross-sectional area is formed, the surface area and therefore acoustic inductance and friction depending on Relative positions are of different sizes and therefore have different frequency characteristics lead of the transducer, but then the effective cross-sectional areas and consequently, the frequency characteristics of position tolerances between the Partition and the mask are dependent. It has proven to be advantageous if at least two of the Partitions penetrating wall openings differ in their cross-sectional area and one of those provided in the flange Mask openings in one relative position with one of the different wall openings to form a Connection between the two rooms and in the other relative position itself with the other of the different wall openings to form a different connection between the two   Rooms covered. In this way, a particularly simple and precisely defined, change in frequency characteristics practically independent of position tolerances of such a converter is achieved because, depending on the relative position of the partition and the mask acoustically effective cross-sectional areas of the the connections connecting the two spaces, the acoustic inductors and resistors form, are realized.

Als vorteilhaft hat sich auch erwiesen, wenn in dem Flansch zumindest zwei der Maskenöffnungen hinsichtlich ihrer Querschnittsfläche unterschiedlich sind und eine der in der Trennwand vorgesehenen Wandöffnungen in der einen Relativlage sich mit einer der unterschiedlichen Maskenöffnungen zur Bildung einer Verbindung zwischen den beiden Räumen und in der anderen Relativlage sich mit der anderen der unterschiedlichen Maskenöffnungen zur Bildung einer anderen Verbindung zwischen den beiden Räumen überdeckt. Auch auf diese Weise ist ein besonders einfaches und genau definiertes, von Lagetoleranzen praktisch unabhängiges Verändern der Frequenzcharakteristiken eines solchen Wandlers mit durch Öffnungsquerschnitte genau definierten akustisch wirksamen Querschnittsflächen der die beiden Räume verbindenden Verbindungen, die akustische Induktivitäten und Widerstände bilden, erreicht. It has also proven to be advantageous if in the flange at least two of the Mask openings are different in terms of their cross-sectional area and one of the in the partition provided wall openings in one relative position with one of the different Mask openings to form a connection between the two rooms and in the another relative position with the other of the different mask openings to form one covered another connection between the two rooms. That way too a particularly simple and precisely defined, of positional tolerances practical independent change of the frequency characteristics of such a converter with through Opening cross sections precisely defined acoustically effective cross-sectional areas of the Connections connecting both rooms, the acoustic inductors and Form resistance, achieved.

Als sehr vorteilhaft hat sich auch erwiesen, wenn von den genannten Öffnungen mit unterschiedlichen Querschnittsflächen jede Öffnung mit einer kleineren Querschnittsfläche einen kreisförmigen Querschnitt aufweist und der Durchmesser jeder solchen Öffnung mit einem kreisförmigen Querschnitt in ihrem akustisch wirksamen Querschnittsbereich kleiner als 0,3 mm ist. Solche Öffnungen bzw. Löcher mit kleinem Durchmesser sind sehr genau unter Einhaltung von vorgegebenen Abmessungen mit sehr geringen Toleranzen herstellbar, so daß mit solchen Öffnungen genau festgelegte, durch das Verhältnis aus akustisch wirksamer Querschnittsfläche und Länge der Öffnung bestimmte akustische Induktivitätswerte und Widerstandswerte und damit genau definierte Einflüsse der mit Hilfe der Öffnungen gebildeten Verbindungen zwischen den beiden Räumen des Wandlers auf das akustische Verhalten des Wandlers erzielt werden. It has also proven to be very advantageous if of the above Openings with different cross-sectional areas, each opening with a smaller one Cross-sectional area has a circular cross-section and the diameter of each such opening with a circular cross section in its acoustically effective Cross-sectional area is less than 0.3 mm. Such openings or holes with small Diameters are very accurate in compliance with specified dimensions very small tolerances can be produced, so that precisely defined openings of this type by the ratio of the acoustically effective cross-sectional area and length of the opening certain acoustic inductance values and resistance values and thus exactly defined influences of the connections formed with the help of the openings between the both rooms of the transducer can be achieved on the acoustic behavior of the transducer.

Als besonders vorteilhaft hat sich erwiesen, wenn der Durchmesser jeder solchen Öffnung mit einem kreisförmigen Querschnitt in ihrem akustisch wirksamen Querschnittsbereich gleich 0,2 mm ist. Bei Untersuchungen hat sich ergeben, daß mit einer solchen Ausbildung besonders gute Ergebnisse erzielt werden. It has proven particularly advantageous if the diameter of each such opening with a circular cross section in its acoustically effective Cross-sectional area is equal to 0.2 mm. Research has shown that with such training particularly good results can be achieved.

Weiters hat sich als besonders vorteilhaft erwiesen, wenn jede solche Öffnung mit einem kreisförmigen Querschnitt in ihrer axialen Richtung, parallel zur Wandlerachse, eine konische Ausbildung aufweist. Dies ist im Hinblick auf eine genau definierte Festlegung der akustisch wirksamen Querschnittsfläche einer solchen Öffnung vorteilhaft, die auf den Bereich des kleinsten Durchmessers der Öffnung konzentriert ist. Weiters ist dies im Hinblick auf eine gute Herstellbarkeit einer solchen Öffnung in einem Kunststoffteil vorteilhaft, und zwar wegen der leichten Entformbarkeit. Furthermore, it has proven to be particularly advantageous if each such Opening with a circular cross section in its axial direction, parallel to the transducer axis, a conical   Training. This is accurate in terms of one Defined definition of the acoustically effective cross-sectional area of such an opening advantageous, which focuses on the area of the smallest diameter of the opening is. Furthermore, this is in view of the good manufacturability of such an opening in a plastic part advantageous, because of the easy release.

Die Erfindung wird im folgenden anhand von drei in den Zeichnungen dargestellten Ausführungsbeispielen näher beschrieben, auf welche die Erfindung jedoch nicht beschränkt sein soll. Die Fig. 1 zeigt in einem Querschnitt gemäß der Linie I-I in Fig. 2 in einem gegenüber der natürlichen Größe größeren Maßstab in etwas schematisierter Weise einen elektrodynamischen Wandler gemäß einem ersten Ausführungsbeispiel der Erfindung, bei dem eine Maske des Wandlers gegenüber einer Trennwand des Wandlers eine erste Relativlage einnimmt. Die Fig. 2 zeigt in einem Schnitt gemäß der Linie II-II in Fig. 1 den Wandler gemäß Fig. 1. Die Fig. 3 zeigt auf analoge Weise wie die Fig. 1 in einem Querschnitt gemäß der Linie III-III in Fig. 4 einen elektrodynamischen Wandler gemäß einem zweiten Ausführungsbeispiel der Erfindung, der im wesentlichen denselben Aufbau wie der Wandler gemäß Fig. 1 aufweist, wobei jedoch die Maske des Wandlers eine zweite Relativlage gegenüber der Trennwand des Wandlers einnimmt. Die Fig. 4 zeigt in einem Schnitt gemäß der Linie IV-IV in Fig. 3 den Wandler gemäß Fig. 3. Die Fig. 5 zeigt in einem Querschnitt in einem gegenüber den Figuren 1 und 3 größeren Maßstab ein Detail von einem elektrodynamischen Wandler gemäß einem dritten Ausführungsbeispiel der Erfindung, der im wesentlichen denselben Aufbau wie der Wandler gemäß den Figuren 3 und 4 aufweist, der aber in seiner Trennwand konisch ausgebildete Wandöffnungen aufweist. The invention will now be described with reference to three in the drawings illustrated embodiments described, but to which the invention should not be limited. Fig. 1 shows in a cross section along the line I-I in Fig. 2 on a larger scale compared to the natural size in a somewhat schematic Way an electrodynamic converter according to a first embodiment the invention, in which a mask of the transducer against a partition of the Converter takes a first relative position. Fig. 2 shows in a section according to the Line II-II in FIG. 1 shows the converter according to FIG. 1. FIG. 3 shows in an analogous manner how Fig. 1 in a cross section along the line III-III in Fig. 4 is an electrodynamic Converter according to a second embodiment of the invention, which in has essentially the same structure as the converter of FIG. 1, but the mask of the transducer a second relative position to the partition of the Converter. FIG. 4 shows a section along the line IV-IV in FIG. 3 the converter according to FIG. 3. FIG. 5 shows a cross section in one opposite Figures 1 and 3 larger scale a detail of an electrodynamic Converter according to a third embodiment of the invention, which is essentially has the same structure as the converter according to Figures 3 and 4, but in its partition has conical wall openings.

In den Figuren 1 und 2 ist ein elektrodynamischer Wandler 1 gemäß einem ersten Ausführungsbeispiel der Erfindung dargestellt, der als Lautsprecher ausgebildet ist. Der Wandler 1 weist eine im wesentlichen kreisringförmige bzw. hohlzylindrisch ausgebildete Halteeinrichtung 2 auf. Die Halteeinrichtung 2 weist eine kreisringförmige Außenwand 3 auf, die in ihrem einer Vorderseite des Wandlers 1 zugewandten Bereich mit einer Abstufung 4 versehen ist. Die Abstufung 4 bildet eine Haltezone, an der eine Membran 5 des Wandlers 1 mittels einer Klebeverbindung befestigt ist. Die Membran 5 weist einen zentralen Bereich (Mittenbereich) 6 auf, der häufig auch als Dom bezeichnet wird. Weiters weist die Membran 5 einen peripheren Randbereich 7 auf, in dem hyperbolisch verlaufende Sicken vorgesehen sind, was in Fig. 1 aber nicht erkennbar ist. Mit dem freien Ende 8 des Randbereiches 7 ist die Membran 5 an der Abstufung 4 der Halteeinrichtung 2 durch Kleben befestigt. Die Membran 5 ist parallel zu einer Wandlerachse 9 hin- und hergehend schwingungsfähig ausgebildet und sie strahlt an der Membranvorderseite 10 im Betrieb hörbare Nutzschwingungen ab. An electrodynamic converter 1 according to FIGS a first embodiment of the invention shown as a speaker is trained. The converter 1 has an essentially circular or hollow-cylindrical holding device 2. The holding device 2 has one circular outer wall 3, which in its one front of the transducer 1st facing area is provided with a gradation 4. The gradation 4 forms one   Holding zone on which a membrane 5 of the transducer 1 by means of an adhesive connection is attached. The membrane 5 has a central area (middle area) 6, which is often also as Cathedral is called. Furthermore, the membrane 5 has a peripheral edge region 7 on, in which hyperbolic beads are provided, which is not the case in FIG. 1 is recognizable. With the free end 8 of the edge region 7, the membrane 5 is on the Gradation 4 of the holding device 2 attached by gluing. The membrane 5 is parallel to a transducer axis 9 back and forth designed to vibrate and they radiates audible useful vibrations on the membrane front side 10 during operation.

Im Übergangsbereich 11 zwischen dem Mittenbereich 6 und dem Randbereich 7 der Membran 5 ist mit der Membran 5 eine Schwingspule 12 mittels einer Klebeverbindung verbunden. Die Schwingspule 12 ragt hierbei mit ihrem von der Membranhinterseite 13 abgewandten Bereich 14 in einen Luftspalt 15 eines Magnetsystems 16 des Wandlers 1. Das Magnetsystem 16 weist einen Magneten 17 und eine Polplatte 18 sowie einen Topf 19 auf, der häufig auch als Außentopf bezeichnet wird. Zwischen der umfangsseitigen Begrenzungsfläche 20 der Polplatte 18 und dem Endbereich 21 des hohlzylindrischen Topfteiles 22, der durch den Bodenteil 23 des Topfes 19 abgeschlossen ist, liegt der Luftspalt 15, in dem sich der Bereich 14 der Schwingspule 12 befindet. In the transition area 11 between the middle area 6 and the The edge region 7 of the membrane 5 is a voice coil 12 by means of the membrane 5 an adhesive bond connected. The voice coil 12 projects here with its from the Area 14 facing away from membrane rear side 13 into an air gap 15 of a magnet system 16 of the transducer 1. The magnet system 16 has a magnet 17 and one Pole plate 18 and a pot 19, which is often referred to as an outer pot. Between the peripheral boundary surface 20 of the pole plate 18 and the end region 21 of the hollow cylindrical pot part 22, which through the bottom part 23 of the pot 19th is completed, is the air gap 15, in which the area 14 of the voice coil 12 is located.

Bei dem vorliegenden Wandler 1 weist die Halteeinrichtung 2 eine von der Außenwand 3 in radialen Richtungen nach innen zu abstehende, im wesentlichen kreisringförmige Trennwand 24 auf, die hierbei der Membranhinterseite 13 der Membran 5 gegenüberliegt und quer zur Wandlerachse 9 verläuft. Die Trennwand 24 ist mit vier gleichmäßig je um 90° zueinander winkelversetzt angeordneten, die Trennwand 24 durchsetzenden, im wesentlichen eine schlitzförmige Querschnittsfläche aufweisenden Wandöffnungen 25, 26, 27 und 28 versehen. Weiters ist die Trennwand 24 mit vier je um 90° zueinander winkelversetzt und je um 45° zu den schlitzförmigen Wandöffnungen 25, 26, 27 und 28 winkelversetzt angeordneten, ebenfalls die Trennwand 24 durchsetzenden, eine kreisförmige Querschnittsfläche aufweisenden Wandöffnungen 29, 30, 31 und 32 versehen. Die Wandöffnungen 25, 26, 27, 28 bzw. 29, 30, 31, 32 sind zur Bildung von Verbindungen zwischen einem zwischen der Membran 5 und der einen Seite 33 der Trennwand 24 liegenden Raum 34 und einem an der anderen Seite 35 der Trennwand 24 liegenden Raum 36 vorgesehen. Bei dem als Lautsprecher ausgebildeten elektrodynamischen Wandler 1 gemäß den Figuren 1 und 2 ist der Raum 36 zur Hinterseite des Wandlers 1 hin offen ausgebildet. Beispielsweise können die schlitzförmigen Wandöffnungen 25, 26, 27 und 28 eine Länge von etwa 6 mm aufweisen. Als günstig hat sich erwiesen, wenn die kreisförmigen Wandöffnungen 29, 30, 31 und 32 einen Durchmesser von kleiner als 0,3 mm und vorzugsweise von 0,2 mm aufweisen. Die kreisförmigen Wandöffnungen können aber auch einen Durchmesser von beispielsweise nur 50 oder 40 µm aufweisen. Beim vorliegenden Wandler 1 gemäß den Figuren 1 und 2 weisen die kreisförmigen Wandöffnungen 29, 30, 31 und 32 in ihrer axialen Richtung eine zylindrische Ausbildung auf. In the present converter 1, the holding device 2 has one of the outer wall 3 to protrude inward in radial directions, substantially circular partition 24, which in this case the membrane rear 13 of the Diaphragm 5 is opposite and extends transversely to the transducer axis 9. The partition 24 is with four evenly spaced 90 ° to each other, the partition 24 penetrating, essentially having a slit-shaped cross-sectional area Wall openings 25, 26, 27 and 28 provided. Furthermore, the partition 24 is four each offset by 90 ° to each other and 45 ° to the slot-shaped wall openings 25, 26, 27 and 28 arranged at an angle, likewise the partition 24 penetrating wall openings 29 having a circular cross-sectional area, 30, 31 and 32 provided. The wall openings 25, 26, 27, 28 and 29, 30, 31, 32 are to form connections between one between the membrane 5 and the one Page 33 of the partition 24 lying room 34 and one on the other side 35 of the Partition 24 lying room 36 is provided. With the trained as a speaker Electrodynamic converter 1 according to Figures 1 and 2, the room 36 for   The rear of the converter 1 is open. For example, the slit-shaped Wall openings 25, 26, 27 and 28 have a length of about 6 mm. As It has proven advantageous if the circular wall openings 29, 30, 31 and 32 have a diameter of less than 0.3 mm and preferably of 0.2 mm. The circular wall openings can also have a diameter of, for example have only 50 or 40 µm. In the present converter 1 according to the Figures 1 and 2 have the circular wall openings 29, 30, 31 and 32 in their axial direction on a cylindrical formation.

Der Wandler 1 weist weiters eine an die Seite 35 der Trennwand 24 angrenzend angeordnete und hierbei an der Trennwand 24 anliegende Maske (Flansch) 37 auf. Die Maske 37 ist mit vier je um 90° zueinander winkelversetzt angeordneten, die Maske 37 durchsetzenden, eine schlitzförmige Querschnittsfläche aufweisenden Maskenöffnungen 38, 39, 40 und 41 versehen, die zur Bildung der Verbindungen zwischen den beiden Räumen 34 und 36 vorgesehen sind. Beispielsweise können die schlitzförmigen Maskenöffnungen 38, 39, 40 und 41 eine Länge von etwa 5 mm und eine Breite von etwa 2,2 mm aufweisen. The converter 1 also has one on the side 35 of the partition 24 adjacently arranged and in this case in contact with the partition 24 mask (flange) 37. The mask 37 is arranged with four, each offset by 90 ° to each other Passing mask 37, having a slit-shaped cross-sectional area Mask openings 38, 39, 40 and 41 provided to form the connections are provided between the two rooms 34 and 36. For example, the slit-shaped mask openings 38, 39, 40 and 41 a length of about 5 mm and have a width of about 2.2 mm.

Zum Erzielen von unterschiedlich großen akustisch wirksamen Querschnittsflächen der Verbindungen zwischen den beiden Räumen 34 und 36, die durch die in Richtung der Wandlerachse 9 zur Überdeckung bringbaren Öffnungen 25, 26, 27, 28 bzw. 29, 30, 31, 32 und 38, 39, 40, 41 in der Trennwand 24 und in der Maske 37 gebildet sind, sind die Trennwand 24 und die Maske 37 in zwei bezüglich der Wandlerachse 9 zueinander verdrehte Relativlagen bringbar und festhaltbar. Bei dem als Lautsprecher ausgebildeten Wandler 1 gemäß den Figuren 1 und 2 sind die Trennwand 24 und die Maske 37 in eine solche Relativlage zueinander gebracht und darin festgehalten, daß sich die Wandöffnungen 25, 26, 27 und 28 mit den Maskenöffnungen 38, 39, 40 und 41 überdecken. Auf diese Weise ist im Bereich von jeweils zwei sich überdeckenden Öffnungen eine große akustisch wirksame Querschnittsfläche der jeweiligen Verbindung zwischen den beiden Räumen 34 und 36 erzielt, die durch die Querschnittsfläche der Maskenöffnungen 38, 39, 40 und 41 exakt festgelegt ist und die für die Realisierung eines als Lautsprecher ausgebildeten Wandlers und der für einen solchen Lautsprecher gewünschten Frequenzcharakteristik erforderlich ist. To achieve acoustically effective cross-sectional areas of different sizes of the connections between the two rooms 34 and 36 that through the openings 25, 26, 27 which can be made to overlap in the direction of the converter axis 9, 28 or 29, 30, 31, 32 and 38, 39, 40, 41 in the partition 24 and in the mask 37 are formed, the partition 24 and the mask 37 in two with respect to the transducer axis 9 rotated relative positions can be brought and held. With the as Speakers trained transducer 1 according to Figures 1 and 2 are the partition 24 and the mask 37 brought into such a relative position to one another and held therein, that the wall openings 25, 26, 27 and 28 with the mask openings 38, 39, Cover 40 and 41. In this way it is in the range of two overlapping Openings have a large acoustically effective cross-sectional area of the respective Connection between the two rooms 34 and 36 achieved by the cross-sectional area the mask openings 38, 39, 40 and 41 is precisely defined and for the Realization of a transducer designed as a loudspeaker and one for one Speaker desired frequency characteristic is required.

Wie aus den Figuren 1 und 2 ersichtlich ist, weist bei dem Wandler 1 der Topf 19 des Magnetsystems 16 einen quer zur Wandlerachse 9 verlaufenden Flansch 37 auf, mit dem der Topf 19 zur Befestigung des gesamten Magnetsystems 16 an der Trennwand 24 festgeklebt ist, und zwar entlang einer in sich geschlossenen, im wesentlichen kreisringförmigen, im äußeren Bereich des Flansches 37 befindlichen Klebeverbindung 42, deren innere Begrenzung 43 in Fig. 2 mit einer strichpunktierten Linie schematisch angedeutet ist. Eine solche Klebeverbindung 42 weist in der Praxis selbstverständlich eine Begrenzung 43 auf, die keinen solchen exakt kreisförmigen Verlauf hat. As can be seen from FIGS. 1 and 2, the converter 1 has the Pot 19 of the magnet system 16 has a flange 37 running transversely to the transducer axis 9   with which the pot 19 for fastening the entire magnet system 16 to the Partition 24 is glued, namely along a self-contained, in essentially circular, located in the outer region of the flange 37 Adhesive connection 42, the inner boundary 43 in Fig. 2 with a dash-dotted line Line is indicated schematically. Such an adhesive connection 42 has in practice of course, a limit 43 that does not have such an exactly circular Has course.

Der Flansch 37 des Topfes 19 des Magnetsystems 16 bildet nicht nur einen Befestigungsteil zum Befestigen des Magnetsystems 16 an der Halteeinrichtung 2, sondern auf besonders einfache und sehr vorteilhafte Weise zusätzlich auch noch die Maske 37 des Wandlers 1. Auf diese Weise ist erreicht, daß die Maske 37 des Wandlers 1 nicht durch einen separaten Bauteil, sondern durch einen Bestandteil eines ohnehin vorhandenen Bauteiles des Wandlers 1, nämlich durch den Flansch 37 des Topfes 19 des Magnetsystems 16 des Wandlers 1, gebildet ist. Dies ist hinsichtlich niedriger Bauteilkosten und insbesondere hinsichtlich von möglichst wenigen Montageschritten und möglichst geringen Montagekosten von Vorteil. Möglichst geringe Montageschritte und Montagekosten sind bei einer Massenproduktion eines solchen elektrodynamischen Wandlers 1 von großer Bedeutung, weil dadurch mit einer einfacher aufgebauten Montagestraße das Auslangen gefunden wird. Auch werden durch die als Flansch des Topfes ausgebildete Maske keine additionellen Toleranzeinflüsse verursacht, was hinsichtlich einer guten Reproduzierbarkeit des akustischen Verhaltens des Wandlers 1 vorteilhaft ist. The flange 37 of the pot 19 of the magnet system 16 not only forms a fastening part for fastening the magnet system 16 to the holding device 2, but also in a particularly simple and very advantageous manner Mask 37 of the converter 1. In this way it is achieved that the mask 37 of the converter 1 not by a separate component, but by a component of one anyway existing component of the converter 1, namely through the flange 37 of the Pot 19 of the magnet system 16 of the transducer 1 is formed. This is regarding lower component costs and especially with regard to the fewest possible assembly steps and the lowest possible installation costs are an advantage. As small as possible Assembly steps and assembly costs are such in mass production electrodynamic converter 1 of great importance because it makes it easier built assembly line the Auslangen is found. Also be considered by the as Flange of the pot formed mask causes no additional tolerance influences, what about good reproducibility of the acoustic behavior of the transducer 1 is advantageous.

In den Figuren 3 und 4 ist ein elektrodynamischer Wandler 1 gemäß einem zweiten Ausführungsbeispiel der Erfindung dargestellt, der als Hör- bzw. Sprechkapsel für Telekommunikationsanwendungen, insbesondere Telefonieanwendungen, ausgebildet ist. Der Wandler 1 gemäß den Figuren 3 und 4 weist im wesentlichen denselben Aufbau wie der Wandler 1 gemäß den Figuren 1 und 2 auf. Unterschiedlich gegenüber dem Wandler 1 gemäß den Figuren 1 und 2 ist bei dem Wandler 1 gemäß den Figuren 3 und 4 aber, daß der Raum 36 an der anderen Seite 35 der Trennwand 24 abgeschlossen ausgebildet ist. An electrodynamic converter 1 is shown in FIGS shown a second embodiment of the invention, which as a hearing or Speech capsule for telecommunications applications, in particular telephony applications, is trained. The converter 1 according to FIGS. 3 and 4 essentially has the same structure as the converter 1 according to Figures 1 and 2. Differently compared to the converter 1 according to FIGS. 1 and 2, the converter 1 according to FIGS 3 and 4, however, that the space 36 on the other side 35 of the partition 24th is completed.

Zum Abschließen des Raumes 36 ist hierfür ein Abschlußteil 44 vorgesehen, der plattenförmig ausgebildet ist. Der Abschlußteil 44 ist mit einem Durchbruch 45 versehen, der im vorliegenden Fall einen kreisförmigen Querschnitt aufweist und mit dem der Abschlußteil 44 mit akustisch dichter Passung auf die Außenumfangsfläche 46 des Topfes 19 des Magnetsystems 16 aufgesetzt ist. Der Abschlußteil 44 weist einen den Durchbruch 45 umgebenden Randbereich 47 auf, mit dem der Abschlußteil 44 mit der Außenwand 3 der Halteeinrichtung 2 akustisch dicht und mechanisch fest verbunden ist. Die Halteeinrichtung 2 bzw. deren Außenwand 3 bildet somit beim vorliegenden Wandler 1 einen Raumbegrenzungsteil zum Begrenzen des Raumes 36. Die Halteeinrichtung 2 und der Abschlußteil 44 bestehen hierbei aus demselben Kunststoffmaterial und sind durch eine Ultraschallschweißverbindung mechanisch fest miteinander verbunden. Im Bereich des Durchbruches 45 ist der Abschlußteil 44 auf besonders einfache Weise nur mittels mechanischer Preßpassung mit dem Topf 19 des Magnetsystems 16 an dessen Außenumfangsfläche 46 verbunden. A closing part 44 is provided for closing off the room 36, which is plate-shaped. The end part 44 has an opening 45 provided, which in the present case has a circular cross section   and with which the end part 44 with an acoustically tight fit on the outer peripheral surface 46 of the pot 19 of the magnet system 16 is placed. The end part 44 has an edge region 47 surrounding the opening 45, with which the end part 44 with the outer wall 3 of the holding device 2 acoustically tight and mechanically firm connected is. The holding device 2 or its outer wall 3 thus forms the present converter 1 a space boundary part for delimiting space 36. The holding device 2 and the end part 44 consist of the same Plastic material and are mechanically strong thanks to an ultrasonic welding connection connected with each other. In the area of the opening 45, the end part 44 is open particularly simple way only by means of a mechanical press fit with the pot 19 of the Magnet system 16 connected to its outer peripheral surface 46.

Bei dem Wandler 1 gemäß den Figuren 3 und 4 weisen die Trennwand 24 und die Maske 37 eine andere Relativlage zueinander auf, als dies bei dem Wandler 1 gemäß den Figuren 1 und 2 der Fall ist. Bei dem Wandler 1 gemäß den Figuren 3 und 4 nehmen die Trennwand 24 und die Maske 37, also der Flansch 37 des Topfes 19 des Magnetsystems 16, eine Relativlage zueinander ein, bei der sich die kreisförmigen Wandöffnungen 29, 30, 31 und 32 mit den schlitzförmigen Maskenöffnungen 38, 39, 40 und 41 überdecken. Auf diese Weise ist im Bereich der sich überdeckenden Öffnungen eine sehr kleine akustisch wirksame Querschnittsfläche der jeweiligen Verbindung zwischen den beiden Räumen 34 und 36 erzielt, die durch die Querschnittsfläche der kreisförmigen Wandöffnungen 29, 30, 31 und 32 exakt festgelegt ist und die für die Realisierung eines als Hör- bzw. Sprechkapsel ausgebildeten Wandlers und der für eine solche Kapsel gewünschten Frequenzcharakteristik erforderlich ist. In the converter 1 according to FIGS. 3 and 4, the partition wall 24 and the mask 37 have a different relative position to one another than is the case with the converter 1 according to FIGS. 1 and 2 is the case. In the converter 1 according to FIGS. 3 and 4 take the partition 24 and the mask 37, ie the flange 37 of the pot 19th of the magnet system 16, a relative position to one another in which the circular Wall openings 29, 30, 31 and 32 with the slit-shaped mask openings 38, 39, 40 and cover 41. In this way it is in the area of the overlapping openings a very small acoustically effective cross-sectional area of the respective connection achieved between the two spaces 34 and 36 by the cross-sectional area of the circular wall openings 29, 30, 31 and 32 is precisely defined and for the Realization of a transducer designed as a hearing or speaking capsule and for one such capsule desired frequency characteristic is required.

Auch bei dem Wandler 1 gemäß den Figuren 3 und 4, der abgesehen von dem Abschlußteil 44 aus denselben Bestandteilen besteht wie der Wandler 1 gemäß den Figuren 1 und 2, ist die Maske 37 des Wandlers 1 ebenfalls durch einen Bestandteil eines ohnehin vorhandenen Bauteiles eines solchen Wandlers gebildet, was - wie bereits erwähnt - hinsichtlich niedriger Bauteilkosten und insbesondere hinsichtlich von möglichst wenigen Montageschritten und möglichst geringen Montagekosten und einer guten Reproduzierbarkeit des akustischen Verhaltens eines solchen Wandlers von Vorteil ist. Also in the converter 1 according to FIGS. 3 and 4, which apart from the end part 44 consists of the same components as the converter 1 according to the Figures 1 and 2, the mask 37 of the converter 1 is also by a component of an existing component of such a transducer, which - as already mentioned - with regard to low component costs and in particular with regard to as few assembly steps as possible and as low as possible assembly costs and one good reproducibility of the acoustic behavior of such a transducer is an advantage is.

In Fig. 5 ist ein Detail von einem elektrodynamischen Wandler 1 gemäß einem dritten Ausführungsbeispiel der Erfindung dargestellt, der ebenso wie der Wandler 1 gemäß den Figuren 3 und 4 als Hör- bzw. Sprechkapsel für Telekommunikationsanwendungen ausgebildet ist. Bei dem Wandler 1 gemäß Fig. 5 weist jede Öffnung 29, 30, 31 und 32 mit einem kreisförmigen Querschnitt, von denen in Fig. 5 nur die Öffnung 30 dargestellt ist, in ihrer axialen Richtung eine konische Ausbildung auf. Dies ist hinsichtlich einer genau definierten Festlegung der akustisch wirksamen Querschnittsfläche einer solchen Öffnung vorteilhaft, die auf den Bereich des kleinsten Durchmessers der Öffnung konzentriert ist, also im vorliegenden Fall des Wandlers 1 gemäß Fig. 5 auf den von der Maske 37 abgewandten Endbereich der Öffnungen 29, 30, 31 und 32. 5 shows a detail of an electrodynamic converter 1 according to FIG a third embodiment of the invention shown, as well as the   Transducer 1 according to FIGS. 3 and 4 as a hearing or speaking capsule for telecommunication applications is trained. In the converter 1 according to FIG. 5, each has Opening 29, 30, 31 and 32 with a circular cross-section, of which in Fig. 5th only the opening 30 is shown, in its axial direction a conical configuration on. This is in terms of a precisely defined definition of the acoustically effective Cross-sectional area of such an opening advantageous to the area of the smallest The diameter of the opening is concentrated, that is, in the present case, the converter 1 5 to the end region of the openings 29 facing away from the mask 37, 30, 31 and 32.

Die Erfindung ist auf die drei Wandler gemäß den vorstehend beschriebenen Ausführungsbeispielen nicht beschränkt. Beispielsweise kann der als Maske vorgesehene Flansch des Topfes eines wie bei den drei beschriebenen Wandlern vorgesehenen Kerntopf-Magnetsystems auch an der der Membran zugewandten Seite einer Trennwand einer solchen Halteeinrichtung anliegen. Auch kann ein anderes Magnetsystem als ein Topfkern-Magnetsystem bei einem erfindungsgemäßen Wandler zum Einsatz kommen, beispielsweise ein Ringkernmagnetsystem. Auch können beispielsweise in der Trennwand mehr als zwei unterschiedliche Arten von Wandöffnungen vorgesehen sein, die mit beispielsweise mehr als einer Art von Maskenöffnungen in einer durch einen Flansch gebildeten Maske in verschiedenen Relativlagen der Trennwand und der Maske zueinander zur Überdeckung bringbar sind. Auch können, anstelle in einem Bereich der Trennwand nur eine Öffnung mit einem kreisförmigen Querschnitt mit kleinem Durchmesser vorzusehen, auch zwei oder mehr solche Öffnungen mit Kreisförmigem Querschnitt mit noch kleineren Durchmessern vorgesehen sein. The invention is based on the three transducers described above Embodiments not limited. For example, it can be used as a mask provided flange of the pot of one of the three transducers described provided core pot magnet system also on the side facing the membrane abut a partition of such a holding device. Another can also Magnet system as a pot core magnet system in a transducer according to the invention are used, for example a toroidal magnet system. Can too for example, in the partition more than two different types of wall openings be provided with, for example, more than one type of mask openings in a mask formed by a flange in different relative positions the partition and the mask can be brought to cover each other. Also can, instead of in one area of the partition, only one opening with a circular To provide a cross section with a small diameter, including two or more Openings with a circular cross section with even smaller diameters are provided be.

Claims (7)

  1. An electroacoustic transducer (1) having a diaphragm (5) constructed to be capable of vibration parallel to a transducer axis (9), which transducer comprises a partition wall (24) facing the back (13) of the diaphragm, which partition wall substantially extends transversely to the transducer axis (9) and is traversed by at least one partition opening (25, 26, 27, 28, 29, 30, 31, 32) to form a passage between a first space (34) situated between the diaphragm (5) and one side (33) of the partition wall (24), and a second space (36) situated at the other side (35) of the partition wall (24), and a mask (37) arranged adjacent one of the two sides (33, 35) of the partition wall (24) and having at least one mask opening (38, 39, 40, 41) traversing it to form the passage between the two spaces (34, 36), which partition wall (24) and mask (37) can be brought into and fixed in at least two mutually rotated relative positions with respect to the transducer axis (9) in order to obtain different acoustically active cross-sectional areas of the passage between the two spaces (34, 36), which passage is formed by means of the openings (25, 26, 27, 28, 29, 30, 31, 32, 38, 39, 40, 41) in the partition wall (24) and in the mask (37), which openings can be made to coincide at least partly in the direction of the transducer axis (9), and a magnet system (16) comprising at least one magnet-system part (19), characterized in that the magnet-system part (19) of the magnet system (16) has a flange (37) which substantially extends transversely of the transducer axis (9), and the flange (37) of the magnet-system part (19) forms the mask (37) of the transducer (1), which mask has at least one mask opening (38, 39, 40, 41).
  2. A transducer as claimed in Claim 1, characterized in that at least two of the partition openings (25, 26, 27, 28, 29, 30, 31, 32) traversing the partition wall (24) differ with respect to their cross-sectional areas, and in the one relative position a mask opening (38, 39, 40, 41) formed in the mask (37) coincides with one of the different partition openings (25, 26, 27, 28) to form a passage between the two spaces (34, 36) and in the other relative position coincides with the other partition openings (29, 30, 31, 32) to form another passage between the two spaces (34, 36).
  3. A transducer as claimed in Claim 1, characterized in that at least two mask openings in the flange (37) differ with respect to their cross-sectional areas, and in the one relative position one of the partition openings formed in the partition coincides with one of the different mask openings to form a passage between the two spaces and in the other relative position coincides with the other ones of the mask openings to form another passage between the two spaces.
  4. A transducer as claimed in Claim 2, characterized in that of said partition openings (25, 26, 27, 28, 29, 30, 31, 32) of the partition which have different cross-sectional areas each opening (29, 30, 31, 32) having a smaller cross-sectional area is of circular cross-section, and the diameter of each such opening (29, 30, 31, 32) of circular cross-section is smaller than 0.3 mm in its acoustically active cross-sectional area.
  5. A transducer as claimed in Claim 3, characterized in that of said mask openings of different cross-sectional areas each opening having a smaller cross-sectional area is of circular cross-section, and the diameter of each such opening of circular cross-section is smaller than 0.3 mm in its acoustically active cross-sectional area.
  6. A transducer as claimed in Claim 4 or 5, characterized in that the diameter of each such opening of circular cross-section is 0.2 mm in its acoustically active cross-sectional area.
  7. A transducer as claimed in Claim 4, 5 or 6, characterized in that each such opening of circular cross-section has a conical shape in its axial direction, parallel to the transducer axis.
EP94200416A 1993-02-26 1994-02-18 Electroacoustic transducer having a mask Expired - Lifetime EP0615398B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0036793A AT398354B (en) 1993-02-26 1993-02-26 ELECTROACOUSTIC TRANSFORMER WITH A MASK
AT367/93 1993-02-26

Publications (2)

Publication Number Publication Date
EP0615398A1 EP0615398A1 (en) 1994-09-14
EP0615398B1 true EP0615398B1 (en) 1998-05-13

Family

ID=3488717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94200416A Expired - Lifetime EP0615398B1 (en) 1993-02-26 1994-02-18 Electroacoustic transducer having a mask

Country Status (7)

Country Link
US (1) US5524151A (en)
EP (1) EP0615398B1 (en)
JP (1) JP3194664B2 (en)
AT (1) AT398354B (en)
DE (1) DE59405929D1 (en)
MY (1) MY109825A (en)
SG (1) SG43981A1 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT398355B (en) * 1993-02-26 1994-11-25 Koninkl Philips Electronics Nv ELECTROACOUSTIC TRANSFORMER WITH A TERMINAL
US5802191A (en) 1995-01-06 1998-09-01 Guenther; Godehard A. Loudspeakers, systems, and components thereof
WO1998038834A1 (en) * 1997-02-28 1998-09-03 Koninklijke Philips Electronics N.V. Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer
WO1999060795A2 (en) * 1998-05-15 1999-11-25 Koninklijke Philips Electronics N.V. Apparatus for operation in an on-ear mode and an off-ear mode
AU1624700A (en) * 1998-11-13 2000-06-05 Godehard A. Guenther Low cost motor design for rare-earth-magnet loudspeakers
US8588457B2 (en) * 1999-08-13 2013-11-19 Dr. G Licensing, Llc Low cost motor design for rare-earth-magnet loudspeakers
WO2001013677A1 (en) 1999-08-13 2001-02-22 Guenther Godehard A Low cost broad range loudspeaker and system
US20020150275A1 (en) * 2000-06-27 2002-10-17 Guenther Godehard A. Low profile speaker and system
US6611606B2 (en) * 2000-06-27 2003-08-26 Godehard A. Guenther Compact high performance speaker
US6993147B2 (en) * 2000-08-14 2006-01-31 Guenther Godehard A Low cost broad range loudspeaker and system
JP4337078B2 (en) * 2001-04-23 2009-09-30 日本電気株式会社 Speaker device
JP3874183B2 (en) * 2002-05-21 2007-01-31 フォスター電機株式会社 Diaphragm for electroacoustic transducer
JP2004096670A (en) * 2002-09-04 2004-03-25 Matsushita Electric Ind Co Ltd Speaker
EP1790192A4 (en) * 2004-09-09 2010-06-02 Godehard A Guenther Loudspeaker and systems
US8189840B2 (en) * 2007-05-23 2012-05-29 Soundmatters International, Inc. Loudspeaker and electronic devices incorporating same
US8418967B2 (en) 2008-02-21 2013-04-16 Cornerstone Research Group, Inc. Passive adaptive structures
DE202014003034U1 (en) * 2014-04-02 2015-04-07 Harman Becker Automotive Systems Gmbh speaker
DE102017119865A1 (en) * 2016-09-07 2018-03-08 Sennheiser Electronic Gmbh & Co. Kg Electrodynamic transducer and method for producing an electrodynamic transducer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217177A (en) * 1937-10-30 1940-10-08 Rca Corp Loud-speaker
US2252846A (en) * 1938-09-30 1941-08-19 Associated Electric Lab Inc Acoustic device
JPS5156618A (en) * 1974-11-13 1976-05-18 Yukimatsu Nakamura Supiika
IE53436B1 (en) * 1981-09-16 1988-11-09 Besson A P Ltd Improvements in or relating to telephone transducers
ATE21477T1 (en) * 1981-12-30 1986-08-15 Plessey Overseas ELECTROACOUSTIC TRANSDUCERS.
US5166984A (en) * 1991-11-06 1992-11-24 Hsiao Yu Teng Loudspeaker
AT400911B (en) * 1993-03-04 1996-04-25 Koninkl Philips Electronics Nv ELECTROACOUSTIC TRANSFORMER WITH A PARTITION AND MASK WALL

Also Published As

Publication number Publication date
SG43981A1 (en) 1997-11-14
JPH06269088A (en) 1994-09-22
EP0615398A1 (en) 1994-09-14
JP3194664B2 (en) 2001-07-30
DE59405929D1 (en) 1998-06-18
ATA36793A (en) 1994-03-15
MY109825A (en) 1997-08-30
AT398354B (en) 1994-11-25
US5524151A (en) 1996-06-04

Similar Documents

Publication Publication Date Title
EP0615398B1 (en) Electroacoustic transducer having a mask
EP0614327B1 (en) Electroacoustic transducer having a partition wall and a mask wall
DE3211072C3 (en) Directional electret microphone
DE69332093T2 (en) speaker
DE2946618C2 (en)
DE2932942C2 (en)
DE4317775C2 (en) speaker
DE60003904T2 (en) ELECTROACOUSTIC TRANSFORMER WITH A MEMBRANE, AND METHOD FOR FIXING THE MEMBRANE IN SUCH A CONVERTER
DE2913957C3 (en) Piezoelectric loudspeaker
EP0062600A1 (en) Electrodynamic loudspeaker for low and medium sound frequencies
DE19913558A1 (en) Loudspeaker construction for reduced production costs
DE2618307A1 (en) ELECTROACOUSTIC CONVERTER, METHOD FOR MANUFACTURING SUCH A CONVERTER, AND DEVICE FOR CARRYING OUT SUCH METHODS
DE19757097B4 (en) Sound reproduction device
DE3302592A1 (en) FLAT-MEMBRANE CONVERTER AND METHOD FOR PRODUCING SUCH A CONVERTER
EP0616483B1 (en) Electroacoustic transducer having a cover part
DE112016006136T5 (en) SOIL SCREEN EARRIER SET WITH AN ACOUSTIC FILTER
DE3126993C2 (en)
DE19821855A1 (en) Flat panel loudspeaker
DE3024777C2 (en) Coaxial multi-way speaker system with planar membrane
EP1125471B1 (en) Microphone
DE1081050B (en) Electro-acoustic pickup
DE3002843C2 (en)
DE3923189A1 (en) Bass loudspeaker leaving large area of diaphragm free to vibrate - separates flexible connected profile
EP0081780B1 (en) Electrodynamic transducer
AT401703B (en) ELECTROACOUSTIC TRANSFORMER WITH A THROUGHPUT

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE DK FR GB

17P Request for examination filed

Effective date: 19950314

17Q First examination report despatched

Effective date: 19961219

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE DK FR GB

REF Corresponds to:

Ref document number: 59405929

Country of ref document: DE

Date of ref document: 19980618

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19980612

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980813

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: KONINKLIJKE PHILIPS ELECTRONICS N.V.

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20021014

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20110218

Year of fee payment: 18

Ref country code: DE

Payment date: 20110216

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20110216

Year of fee payment: 18

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Owner name: KNOWLE ELECTRONICS ASIA PTE. LTD, SG

Effective date: 20111108

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 59405929

Country of ref document: DE

Representative=s name: BOSCH JEHLE PATENTANWALTSGESELLSCHAFT MBH, DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 59405929

Country of ref document: DE

Representative=s name: BOSCH JEHLE PATENTANWALTSGESELLSCHAFT MBH, DE

Effective date: 20120709

Ref country code: DE

Ref legal event code: R081

Ref document number: 59405929

Country of ref document: DE

Owner name: KNOWLES ELECTRONICS ASIA PTE. LTD., SINGAPORE, SG

Free format text: FORMER OWNER: NXP B.V., EINDHOVEN, NL

Effective date: 20120709

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20120218

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20121031

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59405929

Country of ref document: DE

Effective date: 20120901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120229

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120218

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120901