EP0685979A2 - Membrane de centrage - Google Patents

Membrane de centrage Download PDF

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Publication number
EP0685979A2
EP0685979A2 EP95107546A EP95107546A EP0685979A2 EP 0685979 A2 EP0685979 A2 EP 0685979A2 EP 95107546 A EP95107546 A EP 95107546A EP 95107546 A EP95107546 A EP 95107546A EP 0685979 A2 EP0685979 A2 EP 0685979A2
Authority
EP
European Patent Office
Prior art keywords
centering membrane
centering
loudspeaker
voice coil
metal
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.)
Withdrawn
Application number
EP95107546A
Other languages
German (de)
English (en)
Other versions
EP0685979A3 (fr
Inventor
Stefan Geisenberger
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.)
Harman Audio Electronic Systems GmbH
Original Assignee
Nokia Technology GmbH
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
Priority claimed from DE4421418A external-priority patent/DE4421418A1/de
Application filed by Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0685979A2 publication Critical patent/EP0685979A2/fr
Publication of EP0685979A3 publication Critical patent/EP0685979A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • 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
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider

Definitions

  • the invention is concerned with the formation of centering membranes for loudspeakers.
  • centering membranes are used for the radial mounting of the vibrating components of the loudspeaker.
  • this is an annular disk, which has a corrugated contour on average.
  • the inner edge of the centering membrane is connected to the vibrating components of the loudspeaker.
  • the vibrating components can either be the loudspeaker membrane, the so-called voice coil former, or the voice coil itself.
  • the outer edge of the centering membrane is connected to the speaker basket.
  • the centering membrane used should provide the least possible resistance (rigidity) to the stroke movement of the vibrating components of the loudspeaker in the axial direction, but at the same time exclude radial movements of the vibrating components.
  • the resistance of the centering diaphragms acting in the axial direction should have a uniform effect over the entire stroke of the vibrating components.
  • the centering membrane used should be such that it protects the air gap in the magnet system from contamination.
  • the latter is usually solved in such a way that the centering membrane encloses a volume together with the voice coil former, the surface of the magnet system and areas of the loudspeaker basket.
  • the centering membrane is perforated.
  • Materials that fulfill all of the properties listed above and are used as materials for centering membranes are paper, plastic or textile. Depending on the application, these materials can also be used in fabric form and have a resin or plastic coating.
  • the edge areas of the centering membrane are generally glued to the other components of the loudspeaker.
  • centering membranes are only temperature-resistant up to approximately 120 ° C. This lack of temperature resistance manifests itself above all in the fact that the tissue of the centering membrane softens from about 120 ° C. and the centering membranes lose their original shape.
  • the adhesive connections between the centering membrane and other components of the speaker at temperatures above 120 ° C and long-term mechanical stress does not have a high life expectancy. At about 150 ° C the (synthetic resin) coatings on the surface of the centering membrane are no longer stable. The service life of the adhesive connections can easily be improved by using high-quality adhesives.
  • the invention is therefore based on the object of specifying a centering membrane for loudspeakers which can also be used at continuous temperatures of above 150 degrees Celsius.
  • the centering membrane is formed from metal, there are no problems with regard to the temperature resistance of this component in the desired temperature range.
  • Concerns about the damping effect of centering membranes made of metal can be over regulate the thickness of the metal membrane well. This can mean, for example, that the thickness of the centering membrane in the radial direction to the loudspeaker axis can also be inhomogeneous.
  • the resistance effect of a metal membrane formed, for example, in a deep-drawing process can be influenced by regionally or completely hardening. Without being limited to this material, copper-beryllium alloys have proven to be very suitable material alloys for the formation of centering membranes formed from metal.
  • centering membrane itself is provided with openings, an unimpeded air exchange takes place between the volume enclosed by the centering membrane, the voice coil former and the loudspeaker basket and the area arranged above the centering membrane.
  • This design of the centering diaphragm which is also found in conventional centering diaphragms, has the additional advantage in the case of centering diaphragms formed from metal that, through modifications in the size, shape and arrangement of these openings, further possibilities for adjusting the resistance of the centering diaphragm to the vibrating components of the loudspeaker given are.
  • Such openings are also very easy to form by stamping processes.
  • a metal wire mesh can also be used to implement centering membranes formed from metal.
  • the openings in the centering membrane for adjusting the resistance to the vibrating components of the loudspeaker are so large that they do not have a sufficient protective function for the air gap, it may be necessary to use a fine-meshed opening in the loudspeaker basket Cover grille or fabric to prevent dust from entering the air gap.
  • connection of the centering diaphragms formed from metal to the other components of the loudspeaker is particularly simple according to claim 3 when the respective edge regions of the centering diaphragm and the connecting regions of the other components are formed at least on their connecting surfaces from an ultrasonically weldable metal.
  • the respective parts can be connected very easily using the ultrasonic welding technology.
  • the voice coil as another component of the loudspeaker, is formed entirely from an ultrasonically weldable metal
  • the production of the connection between the voice coil and the centering membrane is further simplified since a coating of the component of the loudspeaker provided for the connection can be dispensed with .
  • the centering membrane is connected to another component of the loudspeaker, for example made entirely of aluminum (for example the loudspeaker membrane or the loudspeaker basket).
  • edge fastening between the centering membrane and loudspeaker basket can also be carried out by means of a rivet or screw connection.
  • the openings in the centering diaphragm are at least partially designed such that the centering diaphragm is divided into two individual parts that are not connected to one another, as shown in claim 6, the individual parts obtained and at their edge regions electrically nonconductively connected to the other components of the loudspeaker as Conductors for the electrical connection of the wire ends of the voice coil to the wire ends of the audio signal line can be used.
  • the latter is detailed in claim 8.
  • each of these surfaces can be connected to a different component of the loudspeaker (such as the voice coil former and the centering membrane) by ultrasonic welding, provided that the surfaces of the other components also come into contact with the surfaces and consist of an ultrasonically weldable metal.
  • a layer of insulating material is used as the insulator, which is coated with, for example, copper on two opposite and non-interconnected surfaces, each of these surfaces can be connected to a different component of the loudspeaker (such as the voice coil former and the centering membrane) by ultrasonic welding, provided that the surfaces of the other components also come into contact with the surfaces and consist of an ultrasonically weldable metal.
  • connection of the respective wire ends of the voice coil and sound signal line with the isolated individual parts is further simplified if the individual parts each have surfaces made of an ultrasonic welding brown metal at their contact areas.
  • the wire ends made of copper can also be securely welded to the individual parts by means of ultrasonic welding to contact.
  • FIG. 1 shows a top view of an annular centering membrane 10, which is formed from a copper-beryllium alloy.
  • the inner edge region 11 serves to fasten the centering membrane 10 with one of the vibrating components of the loudspeaker (not shown in FIG. 1). Vibrating components in the sense of this application are understood to be the voice coil, the loudspeaker membrane and the voice coil former.
  • the outer edge region 12 of the centering membrane 10 serves for connection to the loudspeaker basket (likewise not shown in FIG. 1).
  • openings 13 in the centering membrane 10 There are eight openings 13 in the centering membrane 10 trained, which connect the areas in front of and behind the centering membrane and allow air exchange between the areas just mentioned. These openings 13, which are distributed over the surface of the centering diaphragm 10 symmetrically to the loudspeaker axis perpendicular to the paper plane at the intersection of the center lines, have unequal opening cross sections.
  • the configuration of the openings 13 shown in FIG. 1 is only exemplary and can be modified in accordance with the desired rigidity of the centering membrane 10.
  • the surface of the centering membrane 10 is wave-shaped, which is indicated in FIG. 1 by the dashed circular lines and is illustrated in more detail in FIG. 2, which shows a section AA according to FIG. 1.
  • FIG 3 shows a further centering membrane 10 in plan view.
  • This centering membrane 10 is formed by four individual parts 10.1 to 10.4, these individual parts 10.1 to 10.4 being arranged centrally to the loudspeaker axis, which runs perpendicular to the paper line at the intersection at the center line.
  • the individual parts 10.1 to 10.4 themselves do not have any openings 13 of the type shown in FIGS. 1 and 2, but the air exchange between the areas above and below this centering membrane 10 takes place in the free areas 14 which are adjacent to the individual parts 10.4 to 10.14 .
  • the individual parts 10.1 to 10.4 are not connected to one another.
  • the inner edge regions 11 are shown in FIG. 3 All individual parts 10.1 to 10.4 with the interposition of an insulating arrangement 16, which is explained in more detail in connection with FIG. 4, are connected to the voice coil former 15 formed from aluminum. If insulation of the inner edge region 11 is not desired, these edge regions 11 can also be connected directly to the coil carrier 15. If the surface 17 (FIG. 4) of the respective individual parts 10.1 to 10.4 in contact with the coil carrier 15 is formed, for example, from aluminum or copper, the individual parts 10.1 to 10.4 can be connected very easily to the voice coil carrier 15 formed from aluminum by using ultrasonic welding .
  • edge region 11 of the respective individual part 10.1 to 10.14 connected to the voice coil former 15 is formed entirely from aluminum or copper. Rather, a thin aluminum or copper coating of the edge area 11 facing the voice coil former 15 is sufficient to carry out an ultrasonic welding.
  • This insulating edge arrangement 16 consists of a layer of insulating material 18 whose two mutually opposite surfaces have a metal layer 19 made of an ultrasonically weldable metal.
  • ceramic was used as the insulating material. This insulating material is already coated with copper on both sides and can be obtained commercially in this condition. They are also used as insulation material suitable for high temperature resistant plastics that can be plated with aluminum.
  • the use of aluminum, copper or nickel as the coating material for the insulating material has the advantage that the ultrasonic welding technology already discussed above can also be used when using individual parts 10.1 to 10.4 which are insulated from the voice coil former 15. Even if the use of the insulating arrangement 16 was only explained for the voice coil side of the individual parts 10.1 to 10.4 in the context of the discussion of FIGS. 3 and 4, this type of insulating connection can also be carried out on the outer edge regions 12 of the individual parts 10.1 to 10.4, if ensured is that the areas of the speaker cage 20 (FIG. 5) to which the outer edge areas 12 are connected have surfaces formed from an ultrasonically weldable metal in the connection area. For the insulation of the outer edge regions 12, however, the intermediate arrangement of insulation arrangements discussed in connection with FIG.
  • edge region 12 in contrast to the edge region 11, does not require a particularly light type of connection to other components.
  • the outer edge region 12 is connected to the loudspeaker basket 20 with the interposition of an insulating layer 21 and a non-conductive fastening means 22.
  • This fastening means 22 is through the edge 12 of the centering membrane 10 and 10.1, respectively Isolierstofflage 21 and the speaker basket 20 out.
  • FIG. 6b shows the installation situation according to FIG. 6a in a side view (section AA). 6a, the head 34 of the self-tapping screw 33 is designed with a smaller diameter. The pressing action of these screw heads 34 on the edge 12 is ensured in that a circumferential pressure ring 35 is arranged between the edge 12 and the screw head 34. Since the loudspeaker basket 20 is formed from plastic in the exemplary embodiment shown in FIG. 6b, an insulating material layer 21 shown in FIG. 5 could be omitted.
  • the inner edge area of the individual part 10.1 is connected to the voice coil bobbin 15, as has already been explained in connection with FIG. 4.
  • the loudspeaker membrane 23 is attached above the connection of the voice coil support 15 and the individual part 10.1. If the loudspeaker membrane 23 is made of aluminum, for example, or if it has a surface formed of aluminum on its side facing the voice coil support 15, the voice coil support 15 and the loudspeaker membrane 23 can also be connected to one another by using ultrasonic welding.
  • the voice coil 24 is arranged at the lower end of the voice coil bobbin 15. Voice coil carrier 15 and voice coil 24 are immersed in the air gap 25 of the magnet system 26.
  • a contact region 27 is formed, to which a wire end 28 of the voice coil 24 is guided.
  • the voice coil wire is made of copper
  • the wire end 28 can be connected to the contact area 27 very easily by using ultrasonic welding if the contact area 27 is also made of an ultrasonically weldable metal.
  • the contacting of the outer edge region 12 of the individual part 10.1 is achieved in such a way that an angled contact sword 29 is conductively connected to the individual part 10.1.
  • the plug 31 connected to one end of the audio signal feed line 30 is pushed onto the contact sword 29. If at least two of the individual parts shown in FIG. 5 are present, the voice coil 24 can be contacted in a very simple manner with the audio signal feed line 30 of the signal source (not shown).
  • the insulating arrangement 16 shown in FIG. 3 does not necessarily have to be limited to the areas between the voice coil bobbin 15 and the inner edge areas 11. Rather, in another exemplary embodiment (not shown), the insulating arrangement 16 can also have an annular design. If the individual parts 10.1 to 10.4 are used as a contact bridge between the voice coil 24 and the audio signal feed line 30, it is sufficient if only two of the individual parts 10.1 to 10.4 shown in FIG. 3 have an insulating arrangement 16.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
EP95107546A 1994-06-01 1995-05-18 Membrane de centrage. Withdrawn EP0685979A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4419311 1994-06-01
DE4419311 1994-06-01
DE4421418A DE4421418A1 (de) 1994-06-01 1994-06-18 Zentriermembran
DE4421418 1994-06-18

Publications (2)

Publication Number Publication Date
EP0685979A2 true EP0685979A2 (fr) 1995-12-06
EP0685979A3 EP0685979A3 (fr) 1997-04-23

Family

ID=25937111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107546A Withdrawn EP0685979A3 (fr) 1994-06-01 1995-05-18 Membrane de centrage.

Country Status (3)

Country Link
US (1) US5729616A (fr)
EP (1) EP0685979A3 (fr)
JP (1) JPH0851694A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412602B (de) * 1999-09-23 2005-04-25 Akg Acoustics Gmbh Elektroakustischer wandler nach dem elektrodynamischen prinzip
CN101954537A (zh) * 2010-04-19 2011-01-26 瑞声声学科技(深圳)有限公司 发声器件的焊接方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6567528B1 (en) * 1999-11-18 2003-05-20 Harman International Industries, Incorporated Offset apex spider
US6351544B1 (en) 1999-12-10 2002-02-26 Harman International Industries Incorporated Regressively hinged spider
US20050185816A1 (en) * 2002-10-16 2005-08-25 Roark Richard S. Loudspeaker driver having a removable diaphragm assembly, parts kit and method for rebuilding a loudspeaker driver in the field
JP2005328336A (ja) * 2004-05-14 2005-11-24 Pioneer Electronic Corp スピーカー装置用ダンパー、そのダンパーを用いたスピーカー装置及びその製造方法
JP4952211B2 (ja) * 2006-11-22 2012-06-13 コスモギア株式会社 骨伝導イヤホン
EP2306753A4 (fr) * 2008-07-30 2012-11-28 Pioneer Corp Dispositif de haut-parleur
JP2011166335A (ja) * 2010-02-08 2011-08-25 Panasonic Corp スピーカ
GB2518660A (en) * 2013-09-27 2015-04-01 Pss Belgium Nv Loudspeaker

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT412602B (de) * 1999-09-23 2005-04-25 Akg Acoustics Gmbh Elektroakustischer wandler nach dem elektrodynamischen prinzip
CN101954537A (zh) * 2010-04-19 2011-01-26 瑞声声学科技(深圳)有限公司 发声器件的焊接方法
CN101954537B (zh) * 2010-04-19 2013-07-03 瑞声声学科技(深圳)有限公司 发声器件的焊接方法

Also Published As

Publication number Publication date
JPH0851694A (ja) 1996-02-20
US5729616A (en) 1998-03-17
EP0685979A3 (fr) 1997-04-23

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