EP0685981A2 - Haut-parleur - Google Patents

Haut-parleur Download PDF

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Publication number
EP0685981A2
EP0685981A2 EP95107543A EP95107543A EP0685981A2 EP 0685981 A2 EP0685981 A2 EP 0685981A2 EP 95107543 A EP95107543 A EP 95107543A EP 95107543 A EP95107543 A EP 95107543A EP 0685981 A2 EP0685981 A2 EP 0685981A2
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
membrane
voice coil
centering
component
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.)
Granted
Application number
EP95107543A
Other languages
German (de)
English (en)
Other versions
EP0685981B1 (fr
EP0685981A3 (fr
Inventor
Stefan Geisenberger
Manfred Aigner
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 DE4422486A external-priority patent/DE4422486A1/de
Application filed by Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0685981A2 publication Critical patent/EP0685981A2/fr
Publication of EP0685981A3 publication Critical patent/EP0685981A3/fr
Application granted granted Critical
Publication of EP0685981B1 publication Critical patent/EP0685981B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/045—Mounting

Definitions

  • the invention is concerned with the formation of high-temperature resistant connections of loudspeaker components, in particular with the connection of loudspeaker membranes with voice coil carriers.
  • loudspeaker membranes and voice coil carriers of loudspeakers are connected to one another by adhesive if they are not formed in one piece.
  • adhesive for example, it is known to connect an aluminum voice coil former to a loudspeaker membrane made of plastic, metal or paper by means of an adhesive.
  • the requirements placed on such an adhesive connection are also known.
  • Such a connection should be light, firmly connect both substances to one another - even under the influence of heat - and also be easy and quick to form.
  • voice coil former and loudspeaker membrane made of plastic can only solve the problems to a limited extent, since these materials do not have the necessary strength in the desired temperature range.
  • One-piece metal constructions of the voice coil former and loudspeaker membrane cannot currently be produced cost-effectively with the desired properties.
  • the invention is therefore based on the object of specifying a loudspeaker in which the various components of the loudspeaker, in particular voice coil former and loudspeaker membrane, are connected to one another in an environmentally compatible manner up to over 120 degrees Celsius.
  • the components of the loudspeaker to be connected are provided with an ultrasonically weldable metal, at least on their surfaces facing one another and intended for connection, the respective components of the loudspeaker can be connected to one another very easily using ultrasonic welding technology, provided the thickness of the respective metal layer is more than is about 8 ⁇ m.
  • the connection is particularly simple when the components to be connected are made entirely of ultrasonically weldable metal, since in this case there is no need to coat the surface areas provided for the connection.
  • connection in welding technology between the voice coil support and the loudspeaker membrane, between the voice coil support and the centering membrane and between the speaker membrane and the centering membrane can be carried out equally well.
  • this does not mean that only those connections between loudspeaker components in ultrasonic welding technology can be formed which require a lower weight of the connection.
  • the connection between the centering membrane and the speaker cage can also be designed as an ultrasonic weld.
  • the voice coil former is connected to the loudspeaker membrane or the centering membrane is connected to the voice coil former or the loudspeaker membrane with the interposition of an insulating arrangement, the insulator of which is connected to two opposite surface areas is coated with an ultrasonically weldable material. If the insulating arrangement is arranged between the voice coil support and the loudspeaker membrane, heat conduction from the loudspeaker membrane to the voice coil support is made more difficult by the insulator in the case of thermally highly stressed speaker membranes, so that no special measures need to be taken to isolate the voice coil wire arranged on the voice coil support.
  • the centering membrane if it is formed, for example, from two or more parts which are not connected to one another, can act as a contact bridge between the ends of the Voice coil wire and the ends of the audio signal line are used.
  • Ceramic or polyimide materials have proven to be suitable insulation materials. Such materials can be coated in suitable material thicknesses with, for example, aluminum or copper.
  • the centering membrane can be welded particularly well if the metal coating of the centering membrane is configured as specified in claim 7.
  • centering membranes formed from non-metal and / or of centering membranes which have no braid structure and are therefore of unbroken design can be connected to the first components of the loudspeaker when the edge provided for connection has the border specified in claim 8.
  • FIG. 1 shows a section through a loudspeaker in a detail, the representations on the right and left of the center line having different exemplary embodiments.
  • the left representation according to FIG. 1 shows a voice coil support 10 which is connected at its upper edge to the speaker membrane 11.
  • the loudspeaker membrane 11 and the voice coil former 10 are formed from aluminum, so that the surface areas 13.1, 13.2 of the loudspeaker membrane 11 and voice coil former 10 in contact with one another consist of materials which can be ultrasonically welded.
  • the connection between the loudspeaker membrane 11, which represents the first component of the loudspeaker in the sense of claims 1 to 3 in the connection area discussed here, is ultrasonically welded to the voice coil former 10, which is a further component in the sense of claims 1 and 2.
  • the cone region 14 of the loudspeaker diaphragm 11 is connected to the centering diaphragm 15, an insulating arrangement 16 being arranged between the loudspeaker diaphragm 11 and the centering diaphragm 15, which is discussed in more detail in connection with FIG. 2.
  • the right representation according to FIG. 1 differs from the left representation in that the insulating arrangement 16 is not arranged between the centering membrane 15 and the loudspeaker membrane 11, but between the loudspeaker membrane 11 and the voice coil former 10.
  • This arrangement has the advantage that the heat conduction from the loudspeaker membrane 11 to the voice coil former 10 or to the voice coil 17 is made more difficult by the intermediate arrangement of the insulating arrangement 16.
  • the intermediate arrangement of the insulating arrangement 16 can also be formed between the centering diaphragm 15 and the loudspeaker diaphragm 11 and between the loudspeaker diaphragm 11 and the voice coil bobbin 10, with which the advantages of the two individual representations according to FIG. 1 are combined.
  • This insulation arrangement 16 is shown enlarged with FIG.
  • This insulation arrangement 16 is formed by a layer of an insulator 18, which in the exemplary embodiment dealt with here is formed from ceramic material.
  • This insulator arrangement 16, which is a further component of the loudspeaker in the sense of claim 1 or claim 3, has on the side of the insulator 18, which faces the first component of the loudspeaker - here the voice coil former 10 - a metal coating 19.1, which is present is made of copper.
  • the surface area 13.2 of the metal coating 19.1 is connected to the surface area 13.1 of the voice coil former 10 made of aluminum by using the ultrasonic welding technique.
  • metal coating 19.2 On the side of the insulator 18 facing away from the metal coating 19.1 there is a further metal coating 19.2 likewise made of copper, which is not conductively connected to the metal coating 19.1.
  • the surface area 13.3 of the metal coating 19.2 is also ultrasonically welded to the surface area 13.4 of the loudspeaker membrane 11 made of aluminum.
  • Each of the two metal coatings 19.1 and 19.2 has a thickness of greater than or equal to 8 ⁇ m, while the thickness of the insulation layer 18 is approximately 1 mm.
  • the feasibility of the invention is not limited to that Limited use of copper as metal for the metal coatings 19.1, 19.2. Rather, the respective metal coating can also be formed from aluminum or nickel. Good results were also achieved with a polyimide film as insulator 18, which was coated on both sides with aluminum to form an insulator arrangement 16.
  • the isolator arrangement 18 shown with FIG. 2 essentially shows the installation situation according to the right illustration from FIG. 1. If the centering membrane 15 is not to be conductively connected to the loudspeaker membrane 11 (left illustration according to FIG. 1), the isolator arrangement 16 according to FIG. 2 is also in this Embodiment usable. In this case, the loudspeaker membrane 11 is the first component of the loudspeaker in the sense of claims 1 to 3, while the isolator arrangement 16 is the further component of the loudspeaker in the sense of claims 1 and 3.
  • FIG 3 shows a further representation of a loudspeaker in section.
  • the voice coil former 10 forms the first component of the loudspeaker in the sense of claims 1 and 2
  • the loudspeaker membrane 11 represents the further component of the loudspeaker in the sense of claims 1 and 2.
  • Both components 10, 11 just named are formed from aluminum and ultrasonically welded to one another.
  • an insulating arrangement 16 according to FIG. 2 can also be arranged in the connection area (not shown in FIG. 3).
  • FIG. 3 shows a centering membrane 15, which is connected to the voice coil bobbin 10.
  • an insulation arrangement 16 according to FIG. 2 can be interposed between the centering membrane 15 and the voice coil support if necessary (not shown in FIG. 3).
  • the dashed representation of the centering membrane 15 in FIG. 3 makes it clear that the centering membrane 15 can also be dispensed with entirely if the centering of the voice coil bobbin 10 is also carried out in a different manner, for example as shown in DE 4241212. Further details on the connection of a centering membrane 15 shown in FIG. 3 to the voice coil former 10 or the loudspeaker membrane 11 will be explained in more detail in connection with FIG. 5.
  • FIG. 4 shows a connection between the voice coil bobbin 10 and the loudspeaker membrane 11, the representations on the right and left of the center line relating to different exemplary embodiments.
  • the voice coil bobbin 10 and the loudspeaker diaphragm 11 are formed from aluminum in both exemplary embodiments and are connected by an ultrasound welding without the interposition of an insulating arrangement 16.
  • the voice coil former 10 is formed longer and thus projects with its upper end 20 deeper into the cone formed by the loudspeaker membrane 11.
  • the inner cross-section of the voice coil bobbin 10 which is also made of aluminum and has a cup-shaped shape, is inserted and connected.
  • the edge 22 of the cap 21, via which it is connected to the inner jacket of the voice coil former 10 points in the direction that the voice coil 17 is turned away from . The latter is because after the cap 21 has been placed with the edge 22 downward, the space delimited by the cap 21 and the voice coil holder 10 is no longer accessible to welding electrodes.
  • the left side of the illustration according to FIG. 4 shows a dust protection cap 21, which is also made of aluminum and is shaped like a dome.
  • This anti-screw cap 21 is connected with its circumferential flange 23 to the inside of the speaker diaphragm 11 by ultrasonic welding.
  • a centering membrane 15 is present and connected to the voice coil support 10 or the loudspeaker membrane 11, such a connection according to the prior art is generally carried out as an adhesive connection.
  • a connection between centering membrane 15 and voice coil former 10 or loudspeaker membrane 11 is now given in connection with FIG. 5, which solves the temperature problems.
  • the centering membrane 15 can be connected to these components 10, 11 very easily in ultrasonic welding if at least the surface regions 13 of the centering membrane 15, which are connected to the respective component 10, 11, are also formed from an ultrasonically weldable metal.
  • cement membranes 15 are conventionally made of textile or plastic mesh, the manufacture of an ultrasonically weldable coating on such materials is very complex and can only be achieved with considerable effort. If, on the other hand, metal or a metal braid is used as the material for the centering membrane 15, this material can be coated very easily with another metal, for example with the metal of the voice coil bobbin 10, by means of galvanic processes. Although such a galvanic coating can be produced with good adhesion to the centering membrane 15, such coating methods are not harmless for reasons of environmental protection. It is therefore much more advantageous to carry out the connection of the centering membrane 15 and the ultrasonically weldable metal coating, as will be explained in more detail below.
  • the desired high mechanical strength between the centering membrane 15 and the voice coil bobbin 10 or loudspeaker membrane 11 is only achieved when the centering membrane 15 is arranged between the strip 24 and the voice coil bobbin 10 or the loudspeaker membrane 11 and the regions of the strip 24 which the braid openings 25 penetrate with the voice coil 10 or the speaker membrane 11 are ultrasonically welded.
  • the latter is shown schematically in FIG. 5b for a connection between loudspeaker diaphragm 11 and centering diaphragm 15.
  • a particularly stable attachment between the centering membrane 15 and the respective component 10, 11 of the loudspeaker can be carried out if the strip 24 inserted into the tool is embossed by means of ultrasound while the centering membrane 15 is embossed is softened. This softening can also be carried out after the centering membrane 15 has been connected to the strip 24 following the embossing step.
  • the metal of the strip 24 penetrates the braid openings 25 such that a continuously thin metal film 26 also forms on the side of the centering membrane 15 facing away from the strip 24.
  • Figure 5c Since the metal film 26 and the remaining strip 24 have approximately the same thickness, this is for welding to the loudspeaker membrane 11 or the voice coil bobbin 10 no matter whether the metal film 26 or the strip 24 is used.
  • the centering membrane 15 discussed in connection with FIGS. 5a-c was formed from a beam wire mesh.
  • the thickness of the wire was approximately 0.1 mm. This does not mean that the centering membrane 15 cannot be formed from a non-metal.
  • the process should be modified so that no strip is used that is pressed through the braid openings.
  • the edge of the centering membrane 15, which is to be connected for connection to the loudspeaker membrane 11 or the voice coil bobbin 10 should be bordered by an approximately U-shaped profile made of ultrasonically weldable metal. The latter is shown in Figure 5d.
  • 5d was formed in that an L-shaped angle piece was bent around the edge 28 of the centering membrane 15, so that after bending, both legs 29, 30 of the U-shaped one Clamp the edge 28. If the surfaces of the border 27, which bear against the centering membrane 15, are roughened or provided with projections (not shown) which penetrate into the centering membrane 15 after bending, a stable connection between the border 27 and the centering membrane 15 is created. For additional strengthening of the connection, the border 27 together with the centering membrane 15 can also be provided with an approximately step-shaped embossed bead (not shown).
  • the centering membrane 15 does not necessarily have to be formed from an openwork mesh.
  • the border 27 is also not limited to centering membranes 15 made of non-metal, but can also be used for centering membranes 15 made of metal.
  • the connection between the centering membrane 15 provided with an enclosure 27 and, for example, the loudspeaker membrane 11 is realized in such a way that the leg 30 of the enclosure 27 is placed on an anvil 31 serving as a counter electrode.
  • the sonotrode 32 is then placed on the inside 33 of the loudspeaker membrane 11 in such a way that the loudspeaker membrane 11 and the legs 29, 30 of the casing 27 and the edge 28 are pressed against the anvil 31. If the ultrasonic welding is carried out in this state, the leg 29 of the surround 27 connects to the loudspeaker membrane 11.
  • the centering membrane 15 used is formed from an openwork braid, the metal of the surround 27 penetrates the braid openings 25 (not shown in FIG. 5d) and connects both legs 29, 30 through the centering membrane 15.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
EP95107543A 1994-06-01 1995-05-18 Haut-parleur Expired - Lifetime EP0685981B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4419253 1994-06-01
DE4419253 1994-06-01
DE4422486A DE4422486A1 (de) 1994-06-01 1994-06-28 Lautsprecher
DE4422486 1994-06-28

Publications (3)

Publication Number Publication Date
EP0685981A2 true EP0685981A2 (fr) 1995-12-06
EP0685981A3 EP0685981A3 (fr) 1996-06-05
EP0685981B1 EP0685981B1 (fr) 2001-08-29

Family

ID=25937100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107543A Expired - Lifetime EP0685981B1 (fr) 1994-06-01 1995-05-18 Haut-parleur

Country Status (4)

Country Link
US (1) US5699439A (fr)
EP (1) EP0685981B1 (fr)
JP (1) JPH0847089A (fr)
AT (1) ATE205040T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2518660A (en) * 2013-09-27 2015-04-01 Pss Belgium Nv Loudspeaker

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2336499B (en) * 1998-03-18 2002-06-12 Nokia Mobile Phones Ltd Audio diaphragm mounting arrangements in radio telephone handsets
US6372066B1 (en) 1999-05-06 2002-04-16 New Transducers Limited Vibration exciter
WO2000069214A2 (fr) * 1999-05-06 2000-11-16 New Transducers Limited Excitateur de vibrations
EP1128705B1 (fr) * 2000-02-25 2009-05-06 Star Micronics Co., Ltd. Haut-parleur
JP3619736B2 (ja) 2000-02-25 2005-02-16 スター精密株式会社 スピーカ
US20070053545A1 (en) * 2005-09-07 2007-03-08 Steff Lin Speaker
KR101534470B1 (ko) * 2014-04-25 2015-07-08 에스텍 주식회사 압전 스피커
GB201513555D0 (en) 2015-07-31 2015-09-16 Pss Belgium Nv Audio system

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925626A (en) * 1974-02-22 1975-12-09 Jr Robert John Stallings Dynamic speaker having dome diaphragm and basket frequency
SU522555A1 (ru) * 1975-01-02 1976-07-25 Специальное Конструкторское Бюро Кировоградского Завода Радиоизделий Головка электродинамического громкоговорител
AT338351B (de) * 1975-04-29 1977-08-25 Philips Nv Elektroakustischer wandler, verfahren zur herstellung eines solchen wandlers und vorrichtung zur durchfuhrung solcher verfahren
NL8200416A (nl) * 1982-02-04 1983-09-01 Philips Nv Vlakmembraan omzetter en werkwijze voor het vervaardigen van een dergelijke omzetter.
JPS58209293A (ja) * 1982-05-31 1983-12-06 Hitachi Ltd スピ−カ
US4590333A (en) * 1984-06-14 1986-05-20 John Strohbeen Multidriver loudspeaker
JPS61220592A (ja) * 1985-03-26 1986-09-30 Kozo Sakane スピ−カ装置
US4825533A (en) * 1985-10-11 1989-05-02 Pioneer Electronic Corporation Method of making a voice coil with rectangular coil wire and foil leads
EP0251057A1 (fr) * 1986-06-21 1988-01-07 EWD Electronic-Werke Deutschland GmbH Haut-parleur
WO1989000372A1 (fr) * 1987-07-03 1989-01-12 E W D, Electronic-Werke Deutschland Gmbh Membrane pour haut-parleurs
US5062140A (en) * 1988-04-27 1991-10-29 Sony Corporation Induction speaker
NL9002510A (nl) * 1990-11-16 1992-06-16 Stage Accompany B V Luidspreker met koeling.
AT397898B (de) * 1991-09-25 1994-07-25 Akg Akustische Kino Geraete Membran für elektrodynamische wandler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2518660A (en) * 2013-09-27 2015-04-01 Pss Belgium Nv Loudspeaker
US9774972B2 (en) 2013-09-27 2017-09-26 Pss Belgium, N.V. Loudspeaker

Also Published As

Publication number Publication date
ATE205040T1 (de) 2001-09-15
EP0685981B1 (fr) 2001-08-29
EP0685981A3 (fr) 1996-06-05
JPH0847089A (ja) 1996-02-16
US5699439A (en) 1997-12-16

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