EP0126841A2 - Membrane pour haut-parleur - Google Patents

Membrane pour haut-parleur Download PDF

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Publication number
EP0126841A2
EP0126841A2 EP84100977A EP84100977A EP0126841A2 EP 0126841 A2 EP0126841 A2 EP 0126841A2 EP 84100977 A EP84100977 A EP 84100977A EP 84100977 A EP84100977 A EP 84100977A EP 0126841 A2 EP0126841 A2 EP 0126841A2
Authority
EP
European Patent Office
Prior art keywords
loudspeaker diaphragm
paper layers
diaphragm according
intermediate layer
plastic
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.)
Ceased
Application number
EP84100977A
Other languages
German (de)
English (en)
Other versions
EP0126841A3 (fr
Inventor
Michael Bolz
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.)
Visaton Peter Schukat
Original Assignee
Visaton Peter Schukat
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 Visaton Peter Schukat filed Critical Visaton Peter Schukat
Publication of EP0126841A2 publication Critical patent/EP0126841A2/fr
Publication of EP0126841A3 publication Critical patent/EP0126841A3/fr
Ceased 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
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction

Definitions

  • the invention relates to a loudspeaker diaphragm corresponding to the preamble of claim 1.
  • materials for loudspeaker diaphragms must have the lowest possible basis weight so that the diaphragm can follow the displacements of the coil with little inertia, and also have the highest possible dimensional stability (flexural strength) so that the diaphragm does not deform under the forces of the coil during acceleration and does not "breathe", ie shows undesirable secondary vibrations.
  • a loudspeaker membrane which consists of solidified foam and has two outer skins approximately made of paper with a thickness of a few hundredths of a millimeter, but at most one tenth of the membrane thickness, which cover the foam body firmly adhering everywhere.
  • the invention has for its object to develop a membrane of the type corresponding to the preamble of claim 1 so that a higher rigidity is achieved with low weight.
  • small interruptions is intended to mean that the plastic intermediate layer should not be a solid, compact plastic layer, but rather that the plastic layer should have recesses or cavities which reduce its weight.
  • the dimensions of the "small interruptions” are said to be approximately in the order of the layer thicknesses, the ones remaining between the interruptions Ranges of at most the same, but preferably smaller order of magnitude.
  • the connection of the two layers of paper to one another is to take place through the areas, webs or walls of the plastic which remain between the small interruptions, in which the plastic is then solid.
  • the paper layers are bonded, which allows only very little shear, which results in a clear sandwich effect, ie a clear gain in the dimensional stability of the three-layer material. is recorded.
  • the high dimensional stability and the "holes" of the plastic are essential for the invention, which is evident, for example, from the fact that paper layers adhered to the entire surface by means of a permanently elastic contact adhesive do not produce the desired effects: they are too heavy because of the solid intermediate layer and have none because of the permanent elasticity thereof good flexural strength.
  • the small interruptions can be bubbles present in the intermediate layer, for example, if the intermediate layer consists of a plastic foamed before or during the joining of the material. In this case, open passages from one layer of paper to another need not necessarily be present in the intermediate layer. However, the material has internal hollows and also an uneven mass distribution over the surface.
  • Another Possible embodiment (claim 3) provides that the small interruptions are generated in that the intermediate layer is designed as a latticework.
  • the starting material for the intermediate layer can thus be, for example, a perforated film, a woven fabric or a correspondingly looser fleece or scrim. In this case, there are also continuous interruptions in the intermediate layer in the finished membrane material, in the area of which there is no connection of the mutually adjacent sides of the paper layers.
  • the intermediate layer is connected to the paper layers with the aid of a separate shear-resistant binder or adhesive
  • the preferred embodiment provides an immediate connection of the intermediate layer to the paper layers (claim 4). This is advisable because of the small thickness of the intermediate layer, but also because of the desired maximum shear strength and the simplicity of manufacture.
  • a preferred dimensioning of the intermediate layer is that it has approximately the same to twice the thickness as one of the paper layers.
  • the two paper layers will have approximately the same thickness and be of the same design, in order to ensure essentially the same properties of the membrane when stressed in the two directions perpendicular to the membrane surface.
  • Different layers of paper are for besti I T D - not excluded te applications.
  • the plastic is preferably a thermoplastic, in particular polystyrene (claims 6, 7), which, due to its high modulus of elasticity of 30,000 daN / cm 2, has considerable rigidity and, moreover, can be plasticized very easily by thermal action and can be connected directly to the paper layers.
  • Such material is, for example, made of polystyrene in fine-pored foamed webs and is placed between the paper layers during the manufacture of the membrane material and then exposed to the action of pressure and heat, whereby it partially melts and bonds with the paper.
  • the bubbles in the foamed sheet material ensure that there is no compact compact layer between the paper layers, but that the foam structure can still be recognized on the finished membrane material if the process is suitably controlled.
  • the stiffness of a sandwich structure depends on the resistance of the cover layers to stresses in their plane. It is therefore understood that papers as strong as possible are used for the loudspeaker diaphragm according to the invention, that is to say not types of nonwoven or blotting paper.
  • the weight per unit area should be in the range from 20 to 10 0 g / m 2 .
  • the strength of a sandwich structure depends on the quality of the anchoring of the layers to one another. So that good adhesion is achieved, in particular when using polystyrene, which is joined to the paper layers under the influence of temperature and pressure, the paper should have a certain minimum roughness on the corresponding side (claim 10).
  • parchment paper (claim 11), which has a particularly high tensile and compressive strength.
  • a preferred procedure for producing the loudspeaker diaphragm is given in claim 12.
  • a multilayer structure of a membrane for a loudspeaker is also apparent from DE-OS 28 51 745. Here too, however, all three layers are made of compact plastic material.
  • FIG. 1 shows two paper layers 1, 2, between which a sheet material 11 made of a foamed polystyrene is arranged, the starting thickness of which considerably exceeds the thickness of the paper layers.
  • a sheet material 11 made of a foamed polystyrene is arranged in the web material 11 .
  • the volume fraction of the bubbles 6 far exceeds that of the plastic material, so that the web material 11 has a total density of about 0.02 to 0.1 before pressing.
  • the average bubble diameter is 0.1 mm.
  • the thickness ratios before pressing are shown approximately to scale in FIG. 1, because in one exemplary embodiment the paper thickness is approximately 0.06 mm, the thickness of the web material 11 is approximately 3 mm.
  • the three layers 1, 2, 11 are then placed between heated press plates 4, 5, which press the layers together until the web material 11 is compressed into an intermediate layer 3, which is only about twice the thickness of the individual paper layers 1, 2.
  • the interrupted structure of the starting material remains in the intermediate layer 3, i.e. the intermediate layer 3 does not melt into a compact layer, but still has recognizable small interruptions in the form of flattened bubbles or empty spaces 6 ', between which the compact plastic material of the bubble walls is present, which is directly under the action of pressure and heat connects with the paper layers 1,2.
  • the intermediate layer 3 forms shear-proof webs between the paper layers 1, 2.
  • the superimposed layers 1, 2, 3 were pressed between pressing surfaces 4.5 heated to 110-120 ° C. at a pressure of 3000 Pa for about 10 seconds.
  • the material was tested for its flexural strength in a simple device (Fig. 5). 2 cm wide test strips 15 were placed flat on supports 8,9 5 cm apart and loaded with a weight 10 in the middle. The bending strength is then calculated from the quotient weight 10 / deflection 9, the deflections of course being kept low. It surrendered
  • the new membrane is therefore stiffer and lighter than the known membranes.
  • the improvement in acoustic properties achieved as a result is clearly audible in comparison.
  • the intermediate layer 3 ' consists of a loose fabric 12 made of a thermoplastic material. Between the warp and weft pieces, open areas 13 remain in the order of magnitude of 0.2-1.0 mm, while the threads have diameters of 0.1-0.4 mm.
  • the structure indicated in FIG. 4 results, in which the paper layers 1, 2 are connected to the intermediate layer 3 ′ at the locations 14 that are evenly distributed over the surface.
  • the material of the fabric 12 has the same properties as the material of the foamed polystyrene 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Laminated Bodies (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP84100977A 1983-05-28 1984-02-01 Membrane pour haut-parleur Ceased EP0126841A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833319423 DE3319423C2 (de) 1983-05-28 1983-05-28 Lautsprechermembran
DE3319423 1983-05-28

Publications (2)

Publication Number Publication Date
EP0126841A2 true EP0126841A2 (fr) 1984-12-05
EP0126841A3 EP0126841A3 (fr) 1986-03-12

Family

ID=6200129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100977A Ceased EP0126841A3 (fr) 1983-05-28 1984-02-01 Membrane pour haut-parleur

Country Status (3)

Country Link
EP (1) EP0126841A3 (fr)
CA (1) CA1210338A (fr)
DE (1) DE3319423C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000076269A1 (fr) * 1999-06-05 2000-12-14 Röhm GmbH & Co. KG Procede de fabrication de membranes pour transducteurs electro-acoustiques et membranes ainsi obtenues

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974931C (de) * 1950-06-08 1961-06-08 Emil Dr Podszus Aus erstarrtem Schaum bestehende Lautsprechermembran
DE1925119A1 (de) * 1968-05-18 1969-11-27 Nippon Musical Instruments Mfg Lautsprechermembran
FR2297536A1 (fr) * 1975-01-07 1976-08-06 Manger J W Membrane pour convertisseur electro-acoustique et convertisseur electro-acoustique equipe d'une telle membrane
JPS579194A (en) * 1980-06-18 1982-01-18 Pioneer Electronic Corp Diaphragm for speaker
JPS57155897A (en) * 1981-03-20 1982-09-27 Matsushita Electric Ind Co Ltd Diaphragm for speaker

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2851745C2 (de) * 1978-11-30 1985-01-10 Elektrotechnik Ehmann Gmbh, 6953 Gundelsheim Mehrschichtige Membran für einen elektroakustischen Wandler

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974931C (de) * 1950-06-08 1961-06-08 Emil Dr Podszus Aus erstarrtem Schaum bestehende Lautsprechermembran
DE1925119A1 (de) * 1968-05-18 1969-11-27 Nippon Musical Instruments Mfg Lautsprechermembran
FR2297536A1 (fr) * 1975-01-07 1976-08-06 Manger J W Membrane pour convertisseur electro-acoustique et convertisseur electro-acoustique equipe d'une telle membrane
JPS579194A (en) * 1980-06-18 1982-01-18 Pioneer Electronic Corp Diaphragm for speaker
JPS57155897A (en) * 1981-03-20 1982-09-27 Matsushita Electric Ind Co Ltd Diaphragm for speaker

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 259 (E-149)[1137], 17. Dezember 1982; & JP-A-57 155 897 (MATSUSHITA DENKI SANGYO K.K.) 27.09.1982 *
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 67 (E-104)[945], 28. April 1982; & JP-A-57 009 194 (PIONEER K.K.) 18.01.1982 *
WIRELESS WORLD, Dezember 1958, Seiten 564-569, I.P.C. Business Press Ltd., Hayloards Heath, Sussex, GB; D.A. BARLOW: "Rigidity of loudspeaker Diaphragms, advantages of sandwich construction" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000076269A1 (fr) * 1999-06-05 2000-12-14 Röhm GmbH & Co. KG Procede de fabrication de membranes pour transducteurs electro-acoustiques et membranes ainsi obtenues

Also Published As

Publication number Publication date
EP0126841A3 (fr) 1986-03-12
CA1210338A (fr) 1986-08-26
DE3319423A1 (de) 1984-11-29
DE3319423C2 (de) 1985-03-28

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Inventor name: BOLZ, MICHAEL