EP0360061A2 - Membrane pour haut-parleur - Google Patents

Membrane pour haut-parleur Download PDF

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Publication number
EP0360061A2
EP0360061A2 EP89116256A EP89116256A EP0360061A2 EP 0360061 A2 EP0360061 A2 EP 0360061A2 EP 89116256 A EP89116256 A EP 89116256A EP 89116256 A EP89116256 A EP 89116256A EP 0360061 A2 EP0360061 A2 EP 0360061A2
Authority
EP
European Patent Office
Prior art keywords
shore
membrane
polyurethane film
mpa
thickness
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Withdrawn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
EP89116256A
Other languages
German (de)
English (en)
Other versions
EP0360061A3 (fr
Inventor
Joachim Dipl.-Ing. Wank
Werner Dipl.-Ing. Waldenrath
Dieter Dr. Freitag
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP0360061A2 publication Critical patent/EP0360061A2/fr
Publication of EP0360061A3 publication Critical patent/EP0360061A3/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Withdrawn legal-status Critical Current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; 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
    • 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 for loudspeakers, consisting of a moving element with a dome or cone, at least the moving element consisting of plastic film.
  • both the dome of the cup and the movement element surrounding it consist of a piece of similar film material, such as paper, press shavings bound with phenolic resin, impregnated fabric, polyamide, polycarbonate.
  • the dome or cone and the movement element consist of different materials and are glued together.
  • Polyamide foil or impregnated fabric is mostly used for the movement element, and foil made of titanium, pressed chips bound with phenolic resin, aluminum or polycarbonate is used in particular for the dome or cone.
  • the first system is highly efficient, but has a small transmission range and a limited area of application.
  • the second system has a large one Transmission range on, shows very low resonance frequency, offers good reproduction, but has lower efficiency.
  • Artificial membranes are usually constructed according to the second principle and have corresponding advantages and disadvantages. In both systems, the connection of the voice coil to the membrane is a critical point because it is very difficult to apply the adhesive evenly.
  • the task is to find a membrane for loudspeakers that combines the positive properties of the two known systems.
  • the plastic film consists of thermoplastic polyurethane and has a thickness of 0.02 to 0.8 mm.
  • thermoplastic polyurethane films also offers advantages in terms of production technology: they can be welded and deformed more easily, and are more temperature-resistant than the materials used to date; better adaptation to the geometry results in a significantly better frequency response and a better one Attunement behavior, which also reduces the distortion factor. Thanks to better deformability, membranes with a higher dome or deeper cone can be made from one piece than before.
  • both the movement element and the dome of the calotte or the cone in the welded embodiment preferably consist of thermoplastic polyurethane film.
  • all materials used so far are also suitable for the dome and cone.
  • the films required can be produced from thermoplastic polyurethane using both the blown film process and the flat film process.
  • it is a polyester-polyurethane film with a thickness of 0.1 to 0.6 mm.
  • Suitable polyester polyurethanes can be produced according to DE-OS 28 42 806.
  • it is a polyether polyurethane film with a thickness of 0.08 to 0.7 mm.
  • Suitable polyether polyurethanes can be prepared according to DE-OS 23 02 564.
  • it is a polyether carbonate polyurethane film with a thickness of 0.08 to 0.7 mm.
  • Suitable polyether carbonate polyurethanes can be produced according to DE-OS 22 48 328.
  • shear modulus (according to DIN 53 445) of the polyurethane film is in the range between 0 and 140 ° C between 100 and 10 I MPa, in particular between 2 x 100 and 8 x 100 MPa.
  • the hardness (according to DIN 53 505) of the polyurethane film measured according to Shore A in the range 80 to 96 Shore, in particular in the range 85 to 90 Shore, and measured according to Shore D in the range between 30 and 60 Shore, in particular between 30 and 45 shore.
  • the yield stress (10% elongation) of the polyurethane film is preferably between 1.0 and 10 MPa, in particular between 1.2 and 4 MPa.
  • the membrane consists of a single piece of thermoplastic, in the blowing process from a polyether carbonate polyurethane with a molecular weight of 40,000 manufactured film of 0.18 mm thickness, a shear modulus of 5 ⁇ 100 MPa, a Shore hardness A of 87 Shore and a Shore hardness D of 34 Shore and a yield stress of 1.5 MPa.
  • the membrane has a diameter of 25 mm and consists of an annular movement element 1, which merges seamlessly into a dome 2 with an outer diameter of 19 mm.
  • This membrane was made by thermoforming.
  • a voice coil 3 is fixed instead of the usual adhesive connection with a welded connection 4 at the transition between the moving element 1 and the dome 2. For this purpose, the voice coil 3 was heated to 160 ° C and pressed in the appropriate position and thereby welded to the film material.
  • the cone membrane consists of a moving element 21 made of a polyester film made of flat 0.25 mm thick, a shear modulus at 20 ° C of 8 ⁇ 100 MPa, a Shore hardness A of 88 Shore and a Shore hardness D of 33 Shore and a yield stress of 1.6 MPa.
  • the opening of the movement element 21 is filled by a cone 22 of 19 mm outer diameter, which consists of titanium foil of 0.04 mm thickness, the movement element 21 and cone 22 overlapping and being welded together.
  • This welded connection 24 takes place by means of a heating die heated to 180 ° C. After this process, the voice coil 23 is fastened in the same way as described for FIG. 1, whereby a further welded connection 24 is created.
  • FIG. 3 shows the frequency responses of the membranes shown in FIGS. 1 and 2, namely curve I corresponds to the membrane shown in FIG. 1 and curve II corresponds to that shown in FIG. 2. The quick responsiveness and the portability of higher frequencies is clearly recognizable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP19890116256 1988-09-17 1989-09-02 Membrane pour haut-parleur Withdrawn EP0360061A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3831706 1988-09-17
DE3831706A DE3831706A1 (de) 1988-09-17 1988-09-17 Membran fuer lautsprecher

Publications (2)

Publication Number Publication Date
EP0360061A2 true EP0360061A2 (fr) 1990-03-28
EP0360061A3 EP0360061A3 (fr) 1991-12-11

Family

ID=6363191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890116256 Withdrawn EP0360061A3 (fr) 1988-09-17 1989-09-02 Membrane pour haut-parleur

Country Status (4)

Country Link
US (1) US5056617A (fr)
EP (1) EP0360061A3 (fr)
JP (1) JPH02119500A (fr)
DE (1) DE3831706A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480160A3 (en) * 1990-10-06 1993-01-13 Nokia (Deutschland) Gmbh Dome-shaped high-frequency loudspeaker
WO2019237605A1 (fr) * 2018-06-15 2019-12-19 歌尔股份有限公司 Diaphragme de haut-parleur et haut-parleur
WO2019237606A1 (fr) * 2018-06-15 2019-12-19 歌尔股份有限公司 Diaphragme de haut-parleur et haut-parleur
WO2019237603A1 (fr) * 2018-06-15 2019-12-19 歌尔股份有限公司 Haut-parleur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005252922A (ja) * 2004-03-08 2005-09-15 Matsushita Electric Ind Co Ltd スピーカ及びその製造方法
EP2854421B1 (fr) * 2007-07-25 2017-12-06 Sinar Baja Electric Ltd. Membrane en forme d'anneau pour haut-parleur électro-acoustique

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL283889A (fr) * 1961-10-04
US3285364A (en) * 1965-06-01 1966-11-15 Ling Temco Vought Inc Loudspeaker construction
AT274080B (de) * 1967-07-05 1969-09-10 Philips Nv Schallwandler mit einer Schaumstoffmembran
US3553392A (en) * 1968-03-07 1971-01-05 Electronics Inc Of Pennsylvani Electrodynamic sound radiator
US3578104A (en) * 1968-05-20 1971-05-11 Nippon Musical Instruments Mfg Loudspeaker
US3586121A (en) * 1969-03-03 1971-06-22 Nippon Musical Instruments Mfg Diaphragm for loudspeakers
US3862376A (en) * 1973-01-19 1975-01-21 Stanley F White Cone construction for loudspeaker
DE2302564C3 (de) * 1973-01-19 1985-02-07 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von Polyurethan-Elastomeren
GB1563511A (en) * 1976-03-19 1980-03-26 Harwood H Diaphragms for electroacoustic transducers
JPS5343515A (en) * 1976-09-30 1978-04-19 Matsushita Electric Ind Co Ltd Diaphragm for speaker
JPS5379525A (en) * 1976-12-23 1978-07-14 Sony Corp Compound diaphtagm for speakers
JPS53137129A (en) * 1977-05-07 1978-11-30 Matsushita Electric Ind Co Ltd Vibratory diaphragm for acousitic device
JPS556905A (en) * 1978-06-30 1980-01-18 Pioneer Electronic Corp Diaphragm for acoustic apparatus and its manufacture
DE2842806A1 (de) * 1978-09-30 1980-04-10 Bayer Ag Verfahren zur herstellung von polyurethan-elastomeren
JPS5821997A (ja) * 1981-07-31 1983-02-09 Pioneer Electronic Corp スピ−カ用振動板
DE3521845A1 (de) * 1985-06-19 1987-01-02 Martin Stute Elektrodynamischer lautsprecher

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480160A3 (en) * 1990-10-06 1993-01-13 Nokia (Deutschland) Gmbh Dome-shaped high-frequency loudspeaker
WO2019237605A1 (fr) * 2018-06-15 2019-12-19 歌尔股份有限公司 Diaphragme de haut-parleur et haut-parleur
WO2019237606A1 (fr) * 2018-06-15 2019-12-19 歌尔股份有限公司 Diaphragme de haut-parleur et haut-parleur
WO2019237603A1 (fr) * 2018-06-15 2019-12-19 歌尔股份有限公司 Haut-parleur
US11800287B2 (en) 2018-06-15 2023-10-24 Goertek Inc. Speaker diaphragm and speaker
US11825285B2 (en) 2018-06-15 2023-11-21 Goetek Inc. Speaker diaphragm and speaker

Also Published As

Publication number Publication date
EP0360061A3 (fr) 1991-12-11
US5056617A (en) 1991-10-15
DE3831706A1 (de) 1990-03-22
JPH02119500A (ja) 1990-05-07

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