EP0361487A1 - Membransystem - Google Patents

Membransystem Download PDF

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Publication number
EP0361487A1
EP0361487A1 EP19890118011 EP89118011A EP0361487A1 EP 0361487 A1 EP0361487 A1 EP 0361487A1 EP 19890118011 EP19890118011 EP 19890118011 EP 89118011 A EP89118011 A EP 89118011A EP 0361487 A1 EP0361487 A1 EP 0361487A1
Authority
EP
European Patent Office
Prior art keywords
membrane
axis
membrane system
wall thickness
diaphragm
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Withdrawn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
EP19890118011
Other languages
German (de)
English (en)
French (fr)
Inventor
Dipl.-Ing. Krüger. Helmut
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.)
KRUEGER Helmut
Original Assignee
ANT Nachrichtentechnik 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
Application filed by ANT Nachrichtentechnik GmbH filed Critical ANT Nachrichtentechnik GmbH
Publication of EP0361487A1 publication Critical patent/EP0361487A1/de
Withdrawn legal-status Critical Current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
    • H04R7/02—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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • 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
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped

Definitions

  • the invention relates to a membrane system according to the preamble of claim 1.
  • a membrane system is known from US Pat. No. 4,532,383.
  • the invention is applicable to a membrane or a membrane part of membrane systems for sound transducers, in particular loudspeakers of all kinds, e.g. for dome emitters, for pressure chamber systems, for a middle part of a loudspeaker cone or plate.
  • loudspeakers of all kinds e.g. for dome emitters, for pressure chamber systems, for a middle part of a loudspeaker cone or plate.
  • undesired partial vibrations lead to distortions in the radiated sound vibrations.
  • the object of the invention is to provide a membrane system in which the distortions of radiated sound vibrations are low compared to the vibrations of its drive.
  • the invention is based on calculations and tests which have shown that with the design specification found, good mechanical properties of a membrane can be achieved with the result that disruptive partial vibrations are largely avoided. About such partial vibrations To contain, a certain course of the bending stiffness and the area moment of inertia must be maintained or approximated from the inside to the outside of the membrane.
  • stiffening struts or trusses are preferably dispensed with and instead a preferably solid shape is selected, to which foamed variants are also to be counted.
  • an edge ring can also be provided, which has the membrane at its edge and which is in turn clamped in place so that a guidance of the membrane in the axial direction is ensured.
  • the fastening zone can also be the zone where the membrane is connected to a cone membrane of a loudspeaker, the membrane covering or bridging over the inner edge or the center of the cone membrane.
  • the fastening zone where the membrane is connected to the cone membrane and the drive can be at the same radial coordinate value.
  • FIG. 1 shows a half of a radial section through a cone membrane M, which is provided on its inner edge with a radial guide R f (not mandatory) and an electromagnetic drive E, which acts in the direction of the membrane axis 1.
  • the cone membrane is rigid, ring-shaped, rotationally symmetrical and conical.
  • the drive is diaphragm and cone diaphragm drive at the same time.
  • the edge ring Rr has an annular extension F on its outer edge, which serves to clamp the edge ring and thus indirectly also the membrane M.
  • a rotationally symmetrical, rigid membrane P which serves as a dome oscillator and as dust protection for the drive E.
  • the cone membrane M and the membrane P are glued together in a manner not shown.
  • the glue point is called the fastening zone.
  • Your radial Expansion has been assumed to be negligibly small in the schematic FIG. 1.
  • the membrane P and the cone membrane M can also be made in one piece.
  • the membrane P driven by the drive E in the form of a voice coil, acts as a piston oscillator.
  • Their wall thickness h increases in a central ring area around R0 / 2 with decreasing values of the radial coordinate r.
  • the amount of the constant c and thus the mean value of the wall thickness of the membrane is determined in a known manner either on the basis of empirical values with safety supplements or on the basis of calculations or tests.
  • the strength of the selected material and its density (specific weight) must be taken into account, because the lower limit frequency of a sound transducer depends on the moving masses.
  • the wall thickness must therefore be chosen in accordance with previous practice so that at the maximum deflection (which is dependent on the predetermined maximum load capacity of the sound transducer) the membrane does not experience fatigue fractures or inadmissible clinking.
  • the membrane preferably consists of homogeneous or foamed material with a smooth surface; if a higher effort and thus a higher price is permitted, sandwich molds are preferred.
  • the loudspeaker shown schematically in section in FIG. 2 has a permanent magnetic ring magnet 2 with a soft magnetic core 3 and with a pole plate 4.
  • a diaphragm drive E 'on a hollow cylinder Z which is guided by a radial guide Rf and via which a cone membrane M is driven.
  • This is a so-called Nawi membrane (membrane that cannot be unwound) which deviates from the cone shape (FIG. 1), but nevertheless has a wall thickness profile corresponding to FIG. 1.
  • the cone membrane shape resembles an exponential funnel.
  • the radial coordinate for the membrane drive E 'does not coincide with the radial coordinate for the edge of the membrane P. However, if one only looks at the membrane P, it is actually directly driven at its edge by the cone membrane M, so the cone membrane is the "drive" for the membrane.
  • the cone membrane M merges at its outer edge into an edge ring R r , the extension F of which is attached to a loudspeaker basket 5, which in turn is connected to the pole plate 4.
  • the statements made in connection with FIG. 1 apply to the edge ring.
  • FIG 3 shows a cross section of another membrane P ', but the course of the wall thickness h is again the same as in Figure 1.
  • the membrane is loaded with a weight, consisting of a rod-shaped connecting member G and a body K attached to it, which in turn is connected to a centering membrane Z, which is mounted at the edge in a fixed bearing L.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP19890118011 1988-09-30 1989-09-28 Membransystem Withdrawn EP0361487A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3833238 1988-09-30
DE3833238 1988-09-30
DE3838853 1988-11-17
DE19883838853 DE3838853C1 (enExample) 1988-09-30 1988-11-17

Publications (1)

Publication Number Publication Date
EP0361487A1 true EP0361487A1 (de) 1990-04-04

Family

ID=25872731

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19890911046 Pending EP0436615A1 (de) 1988-09-30 1989-09-28 Membransystem
EP19890118011 Withdrawn EP0361487A1 (de) 1988-09-30 1989-09-28 Membransystem

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19890911046 Pending EP0436615A1 (de) 1988-09-30 1989-09-28 Membransystem

Country Status (4)

Country Link
EP (2) EP0436615A1 (enExample)
JP (1) JPH04503739A (enExample)
DE (1) DE3838853C1 (enExample)
WO (1) WO1990003709A1 (enExample)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529143A3 (en) * 1991-08-30 1993-07-07 Filip Keller Diaphragm for loudspeaker or microphone
FR2706944A1 (en) * 1993-06-24 1994-12-30 Delplanque Jean Claude Compact turbomachine stator with alternating curvature of the (moving) blades
US7945069B2 (en) 2004-11-22 2011-05-17 Harman International Industries, Incorporated Loudspeaker plastic cone body
JP7025833B2 (ja) * 2019-09-17 2022-02-25 株式会社サウンドファン スピーカユニット、及びスピーカ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1088099B (de) * 1957-02-23 1960-09-01 Isophon Werke Ges Mit Beschrae Druckkammersystem fuer elektrodynamische Lautsprecher
US3862376A (en) * 1973-01-19 1975-01-21 Stanley F White Cone construction for loudspeaker
WO1988000423A1 (fr) * 1986-07-04 1988-01-14 Ant Nachrichtentechnik Gmbh Systeme de membrane avec plaque rigide en flexion et symetrique en rotation, servant d'element de reflexion ou de reception du son

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4532383A (en) * 1980-01-04 1985-07-30 Willy Erazm A Electroacoustic transducer having a variable thickness diaphragm

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1088099B (de) * 1957-02-23 1960-09-01 Isophon Werke Ges Mit Beschrae Druckkammersystem fuer elektrodynamische Lautsprecher
US3862376A (en) * 1973-01-19 1975-01-21 Stanley F White Cone construction for loudspeaker
WO1988000423A1 (fr) * 1986-07-04 1988-01-14 Ant Nachrichtentechnik Gmbh Systeme de membrane avec plaque rigide en flexion et symetrique en rotation, servant d'element de reflexion ou de reception du son

Also Published As

Publication number Publication date
JPH04503739A (ja) 1992-07-02
EP0436615A1 (de) 1991-07-17
DE3838853C1 (enExample) 1989-11-30
WO1990003709A1 (de) 1990-04-05

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

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Designated state(s): ES GR

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Effective date: 19900917

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Free format text: VERBUNDEN MIT 89911046.4/0436615 (EUROPAEISCHE ANMELDENUMMER/VEROEFFENTLICHUNGSNUMMER) DURCH ENTSCHEIDUNG VOM 12.08.91.

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: KRUEGER, HELMUT

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Effective date: 19920214

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Effective date: 19930926