EP0082086A1 - Lautsprechermembran und Verfahren zu ihrer Herstellung - Google Patents

Lautsprechermembran und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0082086A1
EP0082086A1 EP82402302A EP82402302A EP0082086A1 EP 0082086 A1 EP0082086 A1 EP 0082086A1 EP 82402302 A EP82402302 A EP 82402302A EP 82402302 A EP82402302 A EP 82402302A EP 0082086 A1 EP0082086 A1 EP 0082086A1
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EP
European Patent Office
Prior art keywords
membrane
panels
fibers
membrane according
resistant fibers
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
EP82402302A
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English (en)
French (fr)
Inventor
Michel Guyot
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0082086A1 publication Critical patent/EP0082086A1/de
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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact

Definitions

  • the present invention relates first of all to a loudspeaker membrane of the composite type, comprising a divided reinforcement material impregnated with a homogeneous material ensuring the continuity of the structure of the membrane.
  • said material is paper and is therefore only relatively homogeneous, and the divided reinforcement material consists of carbon rods; these are cut fibers at most 10 mm and which are scattered and glued into the dough, often without precise orientation. Carbon is thus very badly used, and the increase in weight and above all in cost price that its use entails is not optimally compensated for by an increase in the mechanical and acoustic qualities of the membrane, the homogeneity of which leaves elsewhere to be desired.
  • said material is polypropylene in which, to improve the rigidity, necessary especially at low frequencies, a powder has been incorporated, for example talc.
  • a powder has been incorporated, for example talc.
  • the reinforcing material is very badly used and only allows very imperfectly to obtain the desired qualities for the membranes.
  • a powder material, as well as a rod material practically does not make it possible to obtain a significant increase in the modulus of elasticity of the membrane.
  • the object of the present invention is to remedy these drawbacks of the prior art, with regard to said composite membranes.
  • a loudspeaker membrane of the general type specified at the start is, in accordance with the invention, characterized in that said material consists of a polymerized synthetic resin, and in that said reinforcing material consists of fibers resis continuous aunts.
  • the determining advantage of this basic arrangement lies in the fact that it will thus be possible to conveniently orient said continuous fibers in the direction or directions of the dominant stresses, and thus to avoid as much as possible the deformations of the membrane. We can therefore significantly increase the stiffness of the membrane in the directions in which the modulus of elasticity must be very high.
  • provision may be made for continuous resistant fibers directed, one in one of the two directions defined above, and the others in the other direction.
  • a loudspeaker membrane which, according to another aspect of the invention, will be characterized in that it is produced in the form of a laminate, namely that it comprises at least one layer of continuous resistant fibers directed essentially in a radial or practically radial direction of the membrane, and at least one layer of continuous resistant fibers directed essentially in a direction perpendicular or approximately perpendicular to the generatrices of the membrane.
  • a fiber having a particularly high modulus of elasticity and, if possible, low density will advantageously be used to obtain the above results.
  • carbon fibers with a high modulus of elasticity, boron, kevlar, or glass (R or E) may be used for this purpose.
  • Carbon will be particularly advantageous, having a low density and a particularly high modulus of elasticity. These two properties are particularly valuable for the constitution of a loudspeaker membrane, because they will make it possible to obtain a sparse and extremely rigid membrane, implying a very high internal damping and an excellent yield. These qualities are particularly important for the passage of low frequencies.
  • a membrane according to the present invention may also be characterized in that it is produced from assembled panels, continuous resistant fibers pre-impregnated with a polymerizable synthetic resin.
  • This constitution in panels will allow easily to obtain, by juxtaposition, exactly the desired conformation of membrane, in the form of a truncated cone, portion of hyperboloide, ellipsoid, dome, or other more or less complex geometric shapes. , the number and shape of said panels being determined according to the different curvatures to be obtained and the desired direction for the fibers in each section.
  • the membrane in the shape of a truncated cone, the membrane may therefore be characterized in that said panels have the overall shape of truncated cone sectors.
  • the different panels can be juxtaposed exactly, without extra thickness, but it may be advantageous, on the contrary, to ensure that the radial edges of the panels of resistant fibers overlap one another to form narrow ribs, which preferably extend from one end to the other of the membrane.
  • ribs may have a width of 2 to 3 mm. This arrangement will further increase the elastic modulus of the membrane in exactly radial direction, and this with a negligible weight increase.
  • a honeycomb structure between two layers of continuous resistant fibers.
  • This structure which will be of the order of a few millimeters thick, may for example be made of aluminum or alternatively of cardboard impregnated with a phenolic compound, and will also make it possible to stiffen the membrane.
  • the impregnated cardboard can very easily be stuck on the layers of resistant prepreg fibers.
  • a membrane according to the present invention may also internally include a bonded veil and having a non-united surface, for example of non-woven material (glass or polyester fibers) fixed on a light support (40 g / m2).
  • This arrangement will attenuate the overvoltage of the resonances.
  • a decorative element for example polyester, white or colored, could also be incorporated into a such a membrane and could serve as a shock absorber of resonances.
  • the invention further relates to a method of manufacturing a membrane including one or more of the arrangements which have just been listed.
  • a process for manufacturing a membrane in accordance with the present invention may in particular be characterized in that said panels are cut from sheets of resistant unidirectional fibers, prepreg of a polymerizable synthetic resin.
  • the orientation of the cutouts in the sheet will be chosen according to their shape and the orientation that is desired for the continuous fibers of the membrane (radial or approximately radial, perpendicular or approximately perpendicular to the generatrices).
  • the panel cuts are produced in sheets in which the synthetic resin represents at most 30 to 40% of the total volume of the resin and of the fibers, this in order to obtain the optimum tensile strength, said fibers preferably being in carbon.
  • the prepreg is therefore relatively wrung out, but it still retains a relative tack, which will facilitate the positioning of the panels in the mold.
  • plies of fibers having a thickness of the order of 125 u which, with two layers of panels, will make it possible to obtain a membrane 1/4 mm thick, and a weight of the order 10 g for a diameter of 20 cm.
  • a membrane according to the invention has a very low natural resonance.
  • a particularly advantageous mode of molding for the implementation of a process in accordance with the present invention, may consist essentially in that the synthetic resin is polymerized in a heating mold comprising a male part or core of a shape complementary to the shape of the concave face of the membrane, said panels being placed on this core in the desired orientation and optionally in several layers, then from which one folds, on a base of said core, a crown capable of pressing between it and said base the edge of a waterproof sheet covering.
  • these are panels whose fibers extend from one end to the other of the membrane, namely radially or approximately radially.
  • FIG. 2 represents a membrane 6 (or a portion of membrane) formed with eight panels 5 of fibers cut from the ply (s) 3 (FIG. 2a), but being oriented at 90 ° relative to their orientation according to FIG.
  • a membrane 6 is then obtained in which the resistant fibers extend in a direction perpendicular, or approximately perpendicular, to the radial directions. Again, it is possible to provide overlaps between the edges of the panels, in order to obtain radial stiffeners 7.
  • FIG. 3 we have constituted a laminate membrane 2-6, by superimposing a membrane of the type of that of FIG. 1 with a membrane of the type of that of FIG. 2.
  • a membrane of the type of that of FIG. 2 By angularly positioning, in a suitable manner, the membrane 6 with respect to the membrane 2 , it is possible to ensure that the stiffeners 7 are regularly interposed between the stiffeners 4, the laminated membrane then having sixteen ribs or stiffeners with angular spacings of. 22.5 °.
  • the membrane could consist of more than two superposed layers; as specified above, moreover, a honeycomb structure or the like could be interposed between two layers of panels. (We have not shown in the drawing all the additional provisions which have been mentioned in the foregoing in a sufficiently explicit manner).
  • FIG. 4 another way has been shown of slightly superimposing the lower edge of certain panels and the upper edge of the panels situated immediately below, this in order to obtain ribs or corrugations 8 parallel to the peripheral edge 9 of a membrane 10.
  • Such corrugations may be provided over the entire radial extent of the membrane, or only near its outer edge.
  • At least a portion of the panels will have a height significantly less than the radius of the membrane 10.
  • FIGs 5 and 6 there is shown schematically a molding process, according to the invention, for the preparation of membranes also according to the invention.
  • a conical core 11 provided with a base 12 different panels of resistant fiber impregnated genes 13 (in one or more layers). These panels are then capped by an optionally grooved counter-form 14, which may be made of sheet metal or of a slightly porous material, but which perfectly matches the external shape of all the panels 13 placed on the core.
  • a waterproof sheet 15 can be extended over the assembly, which can be flexible, or semi-rigid and preformed like the counterform 14, a sheet which is silicone-coated and which is reusable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP82402302A 1981-12-16 1982-12-15 Lautsprechermembran und Verfahren zu ihrer Herstellung Ceased EP0082086A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8123534A FR2518348B1 (fr) 1981-12-16 1981-12-16 Membrane de haut-parleur et procede pour sa fabrication
FR8123534 1981-12-16

Publications (1)

Publication Number Publication Date
EP0082086A1 true EP0082086A1 (de) 1983-06-22

Family

ID=9265103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82402302A Ceased EP0082086A1 (de) 1981-12-16 1982-12-15 Lautsprechermembran und Verfahren zu ihrer Herstellung

Country Status (3)

Country Link
EP (1) EP0082086A1 (de)
JP (1) JPS58108896A (de)
FR (1) FR2518348B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU652897B2 (en) * 1992-10-22 1994-09-08 Asahi Kasei Kogyo Kabushiki Kaisha Speaker cone and process for production thereof
EP0749265A1 (de) * 1995-06-16 1996-12-18 P.H.L. Audio S.A. Hochfrequenzlautsprecher
EP1615466B1 (de) * 2004-07-07 2011-12-07 Tadashi Nagaoka Akustische Membran
GB2549955A (en) * 2016-05-03 2017-11-08 4A Mfg Gmbh Membrane plate structure for generating sound waves

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58191792U (ja) * 1982-06-16 1983-12-20 ヤマハ株式会社 電気音響変換器における振動板
JPS58220598A (ja) * 1982-06-16 1983-12-22 Nippon Gakki Seizo Kk 電気音響変換器における振動板並びにその製造方法
JPS63125497U (de) * 1987-02-09 1988-08-16
JPS63125499U (de) * 1987-02-09 1988-08-16
JPS63125498U (de) * 1987-02-09 1988-08-16
JPS63131491U (de) * 1987-02-20 1988-08-29
JP2668932B2 (ja) * 1988-04-30 1997-10-27 ソニー株式会社 スピーカ装置
CN103873989B (zh) * 2014-03-17 2018-01-09 陈坚胜 一种音盆

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR616845A (fr) * 1925-05-18 1927-02-09 Thomson Houston Comp Francaise Perfectionnements aux diaphragmes des appareils récepteurs et émetteurs de sons
US1939447A (en) * 1931-07-16 1933-12-12 Gen Electric Diaphragm for acoustic devices
GB518636A (en) * 1937-08-30 1940-03-04 Telefunken Gmbh Improvements in or relating to acoustic diaphragms
US3350513A (en) * 1964-06-22 1967-10-31 Alfred H Roberts Cone loudspeakers
DE3019121A1 (de) * 1979-05-28 1980-12-04 Pioneer Electronic Corp Formmasse und aus dieser formmasse hergestellte akustische bauelemente

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324812B2 (de) * 1974-01-23 1978-07-22
JPS5437719A (en) * 1977-08-30 1979-03-20 Mitsubishi Electric Corp Diaphragm for speakers
JPS5619298A (en) * 1979-07-26 1981-02-23 Sony Corp Speaker diaphragm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR616845A (fr) * 1925-05-18 1927-02-09 Thomson Houston Comp Francaise Perfectionnements aux diaphragmes des appareils récepteurs et émetteurs de sons
US1939447A (en) * 1931-07-16 1933-12-12 Gen Electric Diaphragm for acoustic devices
GB518636A (en) * 1937-08-30 1940-03-04 Telefunken Gmbh Improvements in or relating to acoustic diaphragms
US3350513A (en) * 1964-06-22 1967-10-31 Alfred H Roberts Cone loudspeakers
DE3019121A1 (de) * 1979-05-28 1980-12-04 Pioneer Electronic Corp Formmasse und aus dieser formmasse hergestellte akustische bauelemente

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 3, no. 60, 23 mai 1979, page 40-E112; & JP - A - 54 37 719 (MITSUBISHI DENKI K.K.) (20-03-1979) *
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 70, 12 mai 1981, page 742 E56; & JP - A - 56 19 298 (SONY K.K.) (23-02-1981) *
PATENTS ABSTRACTS OF JAPAN. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU652897B2 (en) * 1992-10-22 1994-09-08 Asahi Kasei Kogyo Kabushiki Kaisha Speaker cone and process for production thereof
EP0749265A1 (de) * 1995-06-16 1996-12-18 P.H.L. Audio S.A. Hochfrequenzlautsprecher
FR2735646A1 (fr) * 1995-06-16 1996-12-20 Phl Audio Haut-parleur pour frequences elevees
US5875252A (en) * 1995-06-16 1999-02-23 P.H.L. Audio Loudspeaker for high frequencies
EP1615466B1 (de) * 2004-07-07 2011-12-07 Tadashi Nagaoka Akustische Membran
GB2549955A (en) * 2016-05-03 2017-11-08 4A Mfg Gmbh Membrane plate structure for generating sound waves
US11039252B2 (en) 2016-05-03 2021-06-15 4A Manufacturing Gmbh Membrane plate structure for generating sound waves

Also Published As

Publication number Publication date
FR2518348A1 (fr) 1983-06-17
JPS58108896A (ja) 1983-06-29
FR2518348B1 (fr) 1987-04-10

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