EP0956736B2 - Excitateur electrodynamique - Google Patents

Excitateur electrodynamique Download PDF

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Publication number
EP0956736B2
EP0956736B2 EP98902117A EP98902117A EP0956736B2 EP 0956736 B2 EP0956736 B2 EP 0956736B2 EP 98902117 A EP98902117 A EP 98902117A EP 98902117 A EP98902117 A EP 98902117A EP 0956736 B2 EP0956736 B2 EP 0956736B2
Authority
EP
European Patent Office
Prior art keywords
vibration exciter
coupling member
carrier
inertial vibration
exciter according
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.)
Expired - Lifetime
Application number
EP98902117A
Other languages
German (de)
English (en)
Other versions
EP0956736A2 (fr
EP0956736B1 (fr
Inventor
Henry Azima
Martin Roberts
Edward Jarvis
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.)
NVF Tech Ltd
Original Assignee
New Transducers Ltd
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
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Application filed by New Transducers Ltd filed Critical New Transducers Ltd
Priority to DE69831217T priority Critical patent/DE69831217T3/de
Publication of EP0956736A2 publication Critical patent/EP0956736A2/fr
Application granted granted Critical
Publication of EP0956736B1 publication Critical patent/EP0956736B1/fr
Publication of EP0956736B2 publication Critical patent/EP0956736B2/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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • 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
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
    • 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
    • H04R7/16—Mounting or tensioning of diaphragms or cones

Definitions

  • the invention relates to an electro-dynamic exciter e.g. for use in activating a resonant panel-form radiator loudspeaker of the kind described in co-pending International patent application published under WO97/09842 dated 2 September 1996 .
  • the present invention is an electro-dynamic inertial vibration exciter, e.g. of the general kind described in International patent application published under WO97/09859 dated 2 September 1996 which describes an inertial vibration exciter comprising a motor coil assembly having a coil rigidly fixed to a tubular coil former, a magnet assembly disposed concentrically with respect to the motor coil assembly and forming an inertial mass, and resilient means supporting the magnet assembly for axial movement relative to the motor coil assembly, and wherein the tubular member is adapted to be rigidly mounted directly to a member to be vibrated, e.g. a resonant panel loudspeaker, by adhesive means.
  • Another electro-dynamic inertial vibration exciter is known from US patent US 3 801 943 .
  • Japanese utility model JP 49-70941 describes an electro-dynamic exciter comprising an annular damper having long holes in the circumferential direction.
  • the damper also comprise a mounting holes for fixing the damper to a base plate on which a voice coil is mounted.
  • the present invention relates to the efficient construction of exciters and to manufacturing techniques for producing such exciters.
  • the coupling member and the magnet assembly are adapted to interfit one with the other, and means may be provided on the coupling member and on the magnet assembly for fixing the coupling member and magnet assembly together.
  • the fixing means may comprise latch means.
  • the carrier and the suspension member may be integral.
  • the coupling member and the suspension member may be integral.
  • the suspension may be resilient.
  • the suspension may be formed as a diaphragm. Alternatively the suspension may comprise a set of resilient arms.
  • the coupling member and the carrier may be annular and the arms may be connected between the coupling member and the carrier to extend circumferentially.
  • the carrier may have a face adapted for contact with the resonant member and arranged to be fixed thereon, e.g. by adhesive means or by fastening devices.
  • the carrier may be formed integrally with a flange arranged to be fixed to the resonant member.
  • the flange may be disc-like and arranged to support the exciter in a cavity in the resonant member by an edge portion of the flange.
  • the disc may be arranged to close the cavity.
  • An end of the coil former member may be located and mounted in a recess in the carrier.
  • the coil may be mounted on the outer face of the coil former member.
  • the magnet assembly may comprise opposed generally disc-like pole pieces sandwiching a magnet, the periphery of one of which pole pieces being disposed within and adjacent to the motor coil assembly, and the periphery of the other of which pole pieces being formed with an upstanding flange arranged to lie adjacent to and to surround the motor coil assembly.
  • the flange may be adapted to interfit with the coupling member.
  • a lip may be formed on the flange, which lip is shaped to interfit with the coupling member, and fixing means on the coupling member may be adapted to engage the lip.
  • a dust seal may be arranged to close the annular coil carrier.
  • the means suspending the magnet assembly for axial movement relative to the motor coil assembly may comprise a pair of axially spaced suspension parts or components to facilitate the axial guidance of the voice coil with respect to the motor coil assembly.
  • the suspension parts may be of any desired form, e.g. they may comprise respective sets of resilient arms.
  • the respective outer ends of the resilient arms in each suspension part may be coupled together by posts, the lower ends of which form feet adapted for contact with the resonant member.
  • the inner ends of the arms may carry respective annular coupling members adapted to carry the magnet assembly.
  • the invention is a loudspeaker comprising an inertial vibration exciter as described above.
  • Figures 1 to 4 disclose an electro-dynamic inertial vibration exciter (1) of the general kind described in International patent application WO97/09859 for example for exciting bending wave vibration in a resonant member (2) e.g. a panel-form member of the general kind described in International patent application WO97/09842 , to form a loudspeaker.
  • the exciter (1) comprises a motor coil assembly (3,4) and a magnet assembly (5,6,7) forming an inertial mass adapted to move relative to the motor coil assembly (3,4), the exciter being adapted to be fixed in any convenient fashion to the resonant member (2) to be excited to impart bending wave energy to the resonant member (2) when an electrical signal is applied thereto.
  • the motor coil assembly (3,4) comprises a voice coil (3), e.g. of wire, wound on a tubular coil former (4) which is supported at its lower end (17), as seen in Figure 1 , in an annular groove (18) in an annular coil carrier (9) which forms a foot by which the motor coil assembly is secured e.g. by means of an adhesive or the like, to a face of the resonant panel (2).
  • the coil carrier could be secured to the resonant member (2) by fixing means, e.g. fasteners. Such fasteners may be releasable.
  • a bayonet connector may be provided, one part of which is fixed to the resonant member and the other part of which is formed integrally with the exciter.
  • the coil former (4) may be secured in the groove (18) by means of an adhesive.
  • the motor coil assembly (3,4) is surrounded by an annular coupling member (12) which is connected to the motor coil assembly carrier (9) by a resilient annular suspension diaphragm (11) e.g. of rubber-like material which is formed with a concentric annular corrugation (19) to facilitate axial movement of the coupling member relative to the carrier.
  • the carrier (9) and the coupling member (12) may be of hard plastics and may be co-moulded together with the resilient diaphragm (11) to form an integrated suspension component or assembly.
  • the interior of the annular carrier (9) is closed by a disc (10) e.g. of foamed plastics, to form a dust seal closing the interior of the exciter.
  • the magnet assembly (5,6,7) comprises a disc-like magnet (5) sandwiched between opposed pole pieces (6,7), the one (7) of which is disc-like and is co-extensive with the magnet (5), and the other (6) of which is cup-like and is formed with a downturned flange (8) surrounding the magnet (5) and pole piece (7) to form an annular gap (20) for receiving the voice coil (3).
  • the free end of the flange (8) is formed as an outwardly extending lip (22) which is formed with an annular recess (21) at its outer end to define a socket into which the coupling member (12) can be snugly received in the manner of a spigot and socket joint firmly to hold the magnet assembly and the motor coil assembly together. Snap-action clips (13) on the coupling member (12) engage the lip (22) to prevent disengagement.
  • the coupling member (12) is formed with a pair of terminal flanges (14) carrying electrical terminals (15) (see Figure 3 ) which are electrically connected to the voice coil (3) via coil wires or tails (16), whereby the coil can be connected to a signal source and energised thereby.
  • Figure 5 illustrates a modified form of suspension component or assembly for an exciter as described in Figures 1 to 4 in which the resilient diaphragm (11) of Figure 4 is replaced by a relatively stiff diaphragm (23) of textiles fabric impregnated with a plastics material, e.g. epoxy resin.
  • the diaphragm (23) is formed integrally with the coupling member (12) and the coil carrier (9), e.g. by injection moulding the members (9) and (12) into the diaphragm.
  • Figure 6 illustrates an alternative form of suspension component or assembly for an exciter as described in Figures 1 to 4 in which the coil carrier (9), the coupling member (12) and a resilient suspension (28) between the two are formed integrally by an annular member (24) of springy plastics material by moulding the annular member with circumferential slots (25) extending part-way round the annular member to divide the member into an outer part (26), which forms the coupling member (12), an inner part (27) which forms the coil support (9), the inner and outer parts being separated and connected by a resilient suspension formed by an array of three arms (28) defined by the slots (25), which arms extend circumferentially of the member (24) and the outer ends (29) of which are coupled to the outer part (26) and the inner ends (30) of which arms are coupled to the inner part (27).
  • the suspension operates by flexure of the resilient arms.
  • Figures 7 and 8 disclose an arrangement in which an exciter (1) as described above is embedded in a cavity (31) in a resonant panel-form member (2).
  • the carrier (9) is formed integrally with an outwardly extending disc-like flange (32) by which the exciter is mounted in a cavity surrounding recess (33) in a face (34) of the member (2) and whereby the cavity is closed.
  • Figures 9 to 11 there is disclosed an exciter of the general kind described in Figures 1 to 3 , employing a modified form of the suspension component or assembly of Figure 6 .
  • the suspension component consists of two axially spaced sets of the resilient arms (28), further to enhance the guidance of the magnet assembly (5,6,7) relatively to the motor coil assembly (34).
  • Figure 9 shows the magnet assembly exploded away from the suspension component, although only the pole piece (6) is visible. Also the suspension component is shown partly broken away at its right hand side, in the interests of clarity.
  • the suspension component or assembly comprises a single plastics moulding forming the carrier (9) the coupling member (12) and the respective sets of resilient arms (28).
  • the coupling member (12) comprises upper and lower parts as described more fully below.
  • the suspension component comprises an annular carrier (9) formed with an annular groove (18) for receiving and locating the end (17) of a coil former (4).
  • An array of connecting bars (35) extend outwardly from the carrier and their outer ends connect to feet (36) which are adapted to rest against the resilient member (2) (not shown).
  • the feet (36) support the outer ends (29) of a lower set of the resilient arms (28).
  • the inner ends (30) of the lower set of resilient arms carry a lower annular coupling member (12) having an upstanding flange (37) adapted snugly to receive and support the lower end of the flange (8) of the pole piece (6) of a magnet assembly of the general kind shown in Figures 1 and 2 .
  • the feet (36) support upwardly extending posts (38) which support an upper suspension member consisting of an upper set of resilient arms (28) carrying an upper annular coupling member (12) adapted snugly to embrace the flange (8) of the pole piece (6).
  • the upper suspension member is arranged such that the upper ends of the support posts carry the outer ends of the set of arms (28), the inner ends of the arms carrying the upper annular coupling member.
  • the upper annular coupling member may comprise fasteners (not shown) which engage the pole piece (6) with snap action to prevent accidental disengagement. Alternatively the pole piece and the suspension may be fixed together by adhesive means.
  • the invention thus provides convenient ways of manufacturing inertial vibration exciters, including integrated suspension assemblies formed as plastics mouldings or co-mouldings.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un excitateur (1) électrodynamique inertiel de vibrations destiné à exciter un élément (2) capable de soutenir et de propager une énergie vibratoire d'entrée. Ledit excitateur (1) comprend un ensemble moteur à bobine (3, 4) composé d'une bobine (3) fixée de façon rigide sur un élément tubulaire (4) corps de bobine, un ensemble aimant (5, 6, 7) placé concentrique par rapport à l'ensemble moteur à bobine, et des moyens (11) permettant de suspendre l'ensemble aimant de manière qu'il effectue un mouvement axial par rapport à l'ensemble moteur à bobine; il est caractérisé par un support (9) soutenant l'ensemble moteur à bobine (3, 4) et est apte à être connecté à l'élément (2) à exciter.

Claims (23)

  1. Une excitatrice à vibrations inertielle électrodynamique (1) pour l'excitation d'un élément (2), en mesure de soutenir et de propager une énergie vibratoire entrée, composée d'une bobine motrice (3,4) comprenant une bobine (3), fixée de façon rigide sur un composant tubulaire de bobine (4), un ensemble d'aimant (5,6,7), disposé de façon concentrique relativement à la bobine motrice, un dispositif de suspension de l'ensemble de l'aimant pour le déplacement axial relativement à la bobine motrice, un support (9) soutenant la bobine motrice (3,4), et adapté pour être raccordé à l'élément (2) à exciter, et un élément d'accouplement (12) adapté pour se raccorder avec l'ensemble de l'aimant (5,6,7), dans lequel le dispositif de suspension est connecté entre le support (9) et l'élément d'accouplement (12), et le dispositif de suspension comprend un ensemble de bras flexibles (28) raccordés entre l'élément d'accouplement (12) et le support (9) pour se déployer sur un plan circonférentiel, caractérisé d'une part par le fait que le support (9), le dispositif de suspension et l'élément d'accouplement (12) forment un ensemble monobloc, d'autre part par le fait que l'élément d'accouplement (12) et le support (9) sont annulaires.
  2. Une excitatrice à vibrations inertielle conforme à la revendication 1, caractérisée par la présence d'un joint étanche aux poussières (10) fermant le support annulaire.
  3. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par la présence du dispositif (13) sur l'élément d'accouplement et sur l'ensemble de l'aimant pour la fixation de l'élément d'accouplement à l'ensemble de l'aimant.
  4. Une excitatrice à vibrations inertielle conforme à la revendication 3, dans laquelle le dispositif de fixation comprend un verrou (13).
  5. Une excitatrice à vibrations inertielle électrodynamique (1) pour l'excitation d'un élément (2), en mesure de soutenir et de propager une énergie vibratoire entrée, composée d'une bobine motrice (3,4) comprenant une bobine (3), fixée de façon rigide sur un composant tubulaire de bobine (4), un ensemble de l'aimant (5,6,7), disposé de façon concentrique relativement à la bobine motrice, un dispositif de suspension de l'ensemble de l'aimant pour le déplacement axial relativement à la bobine motrice, un support (9) soutenant la bobine motrice (3,4), et adapté pour être raccordé à l'élément (2) à exciter, et un élément d'accouplement (12) adapté pour s'emmancher avec l'ensemble de l'aimant (5,6,7), dans lequel le dispositif de suspension est connecté entre le support (9) et l'élément d'accouplement (12), et caractérisé par le fait que le dispositif de suspension comprend une paire de composants de suspension espacés dans l'axe formant ensemble un ensemble intégral.
  6. Une excitatrice à vibrations inertielle conforme à la revendication 5, caractérisée par le fait que la paire de composants de suspension espacés dans l'axe est moulée de façon intégrale avec le support (9) de bobine et avec l'élément d'accouplement (12) pour engager et soutenir l'ensemble de l'aimant.
  7. Une excitatrice à vibrations inertielle conforme à la revendication 6, caractérisée par le fait que les composants de suspension comprennent des jeux de bras flexibles correspondants, à chacun desquels correspondant un élément d'accouplement (12) approprié.
  8. Une excitatrice à vibrations inertielle conforme à la revendication 5, caractérisée par un dispositif (13) sur l'élément d'accouplement et sur l'ensemble de l'aimant pour la fixation de l'élément d'accouplement avec l'ensemble de l'aimant.
  9. Une excitatrice à vibrations inertielle conforme à la revendication 8, dans laquelle le dispositif de fixation comprend un verrou (13).
  10. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications 5 à 9, caractérisée par le fait que le dispositif de suspension comprend un ensemble de bras flexibles.
  11. Une excitatrice à vibrations inertielle conforme à la revendication 10, caractérisée par le fait d'une part que l'élément d'accouplement (12) et le support (9) sont annulaires, d'autre part que les bras sont raccordés entre l'élément d'accouplement (12) et le support (9) pour se déployer sur un plan circonférentiel.
  12. Une excitatrice à vibrations inertielle conforme à la revendication 11, caractérisée par la présence d'un joint à poussière (10) fermant le support annulaire.
  13. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par le fait que le support (9) se raccorde directement avec l'élément de la bobine (4).
  14. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications 5 à 13, dans laquelle le support (9) et le dispositif de suspension forment un ensemble intégral.
  15. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications 5 à 14, caractérisée par le fait que l'élément d'accouplement (12) et le dispositif de suspension forment un ensemble intégral.
  16. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par le fait que le dispositif de suspension est flexible.
  17. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par le fait que le support (9) possède une face adaptée pour le contact avec l'élément (2).
  18. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par le fait que l'extrémité axiale (17) de l'élément (4) de la bobine est situé et monté dans un évidemment (18) du support (9).
  19. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par le fait que la bobine (3) est montée sur la face extérieure de l'élément (4) de la bobine.
  20. Une excitatrice à vibrations inertielle conforme à une quelconque des revendications précédentes, caractérisée par le fait que l'ensemble de l'aimant (5,6,7) comprend des montants opposés en forme générale de disque (6,7) entre lesquels se trouve un aimant (5), le pourtour d'un (7) desdits montants étant disposé au sein de la bobine (3,4) et adjacent à celle-ci, et le pourtour de l'autre (6) desdits montants étant façonné avec une bride tournée vers le bas (8) disposée de façon à se placer dans une position adjacente à la bobine (3,4) et à entourer cette dernière, en formant un dégagement (20) pouvant recevoir la bobine.
  21. Une excitatrice à vibrations inertielle conforme à la revendication 20, caractérisée par le fait que la bride (8) est adaptée pour permettre son montage avec l'élément d'accouplement (12).
  22. Une excitatrice à vibrations inertielle conforme à la revendication 21, caractérisée par la présence d'un rebord (22) sur la bride (8), ce rebord étant façonné de façon à pouvoir s'emmancher avec l'élément d'accouplement (12), et par un dispositif de fixation (13) sur l'élément d'accouplement, et adapté pour engager le rebord (22).
  23. Un haut-parleur comprenant une excitatrice à vibrations inertielle, conforme à une quelconque des revendications précédentes.
EP98902117A 1997-01-31 1998-01-30 Excitateur electrodynamique Expired - Lifetime EP0956736B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE69831217T DE69831217T3 (de) 1997-01-31 1998-01-30 Elektrodynamischer inertial-schwingungserreger

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9701983.0A GB9701983D0 (en) 1997-01-31 1997-01-31 Electro-dynamic exciter
GB9701983 1997-01-31
PCT/GB1998/000307 WO1998034320A2 (fr) 1997-01-31 1998-01-30 Excitateur electrodynamique

Publications (3)

Publication Number Publication Date
EP0956736A2 EP0956736A2 (fr) 1999-11-17
EP0956736B1 EP0956736B1 (fr) 2005-08-17
EP0956736B2 true EP0956736B2 (fr) 2011-09-14

Family

ID=10806869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98902117A Expired - Lifetime EP0956736B2 (fr) 1997-01-31 1998-01-30 Excitateur electrodynamique

Country Status (31)

Country Link
EP (1) EP0956736B2 (fr)
JP (1) JP2001509985A (fr)
KR (1) KR20000070079A (fr)
CN (1) CN1243653A (fr)
AR (1) AR011597A1 (fr)
AT (1) ATE302538T1 (fr)
AU (1) AU725230B2 (fr)
BG (1) BG103576A (fr)
BR (1) BR9807534A (fr)
CA (1) CA2279602A1 (fr)
CO (1) CO4771176A1 (fr)
CU (1) CU22711A3 (fr)
DE (1) DE69831217T3 (fr)
EA (1) EA001014B1 (fr)
EE (1) EE9900306A (fr)
GB (1) GB9701983D0 (fr)
GE (1) GEP20012595B (fr)
HU (1) HUP0003000A2 (fr)
ID (1) ID19842A (fr)
IL (1) IL130750A0 (fr)
MX (1) MXPA99007004A (fr)
NO (1) NO993719L (fr)
NZ (1) NZ336497A (fr)
PL (1) PL334851A1 (fr)
SK (1) SK102299A3 (fr)
TR (1) TR199901805T2 (fr)
TW (1) TW374285B (fr)
UA (1) UA42881C2 (fr)
WO (1) WO1998034320A2 (fr)
YU (1) YU35899A (fr)
ZA (1) ZA98782B (fr)

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GB9822246D0 (en) * 1998-10-13 1998-12-09 New Transducers Ltd Loudspeakers
DE19821860A1 (de) 1998-05-15 1999-11-18 Nokia Deutschland Gmbh Treiber für flaches Klangpaneel
AU756783B2 (en) 1998-06-22 2003-01-23 Slab Technology Limited Loudspeakers
GB9902585D0 (en) * 1999-02-06 1999-03-24 New Transducers Ltd Vibration exciter
GB9903044D0 (en) * 1999-02-11 1999-03-31 New Transducers Ltd Loudspeakers
TW457828B (en) * 1999-03-03 2001-10-01 Tokin Corp Vibration actuator having magnetic circuit elastically supported by a spiral damper with increased compliance
GB9911271D0 (en) * 1999-05-15 1999-07-14 New Transducers Ltd Acoustic device
GB2360663A (en) * 1999-12-16 2001-09-26 John Nicholas Marshall Implantable hearing aid
GB0023134D0 (en) * 2000-09-21 2000-11-01 New Transducers Ltd Loudspeaker driver
US6751329B2 (en) 2000-09-21 2004-06-15 New Transducers Limited Loudspeaker driver
GB2368484B (en) * 2000-10-25 2004-06-16 B & W Loudspeakers Distributed mode panel type loudspeakers
DE10053252C2 (de) 2000-10-26 2002-10-10 Elac Electroacustic Gmbh Formteil zur Halterung eines Exciters für einen Flachmembranlautsprecher
GB0027278D0 (en) * 2000-11-08 2000-12-27 New Transducers Ltd Loudspeaker driver
US7372968B2 (en) 2000-11-08 2008-05-13 New Transducers Limited Loudspeaker driver
EP1322137A3 (fr) * 2001-11-06 2008-08-27 Hosiden Besson Limited Système de haut-paleur portable et applications du même
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GB9701983D0 (en) 1997-03-19
CU22711A3 (es) 2001-09-14
GEP20012595B (en) 2001-11-26
CN1243653A (zh) 2000-02-02
WO1998034320A3 (fr) 1998-11-19
DE69831217T3 (de) 2012-02-09
DE69831217D1 (de) 2005-09-22
NO993719D0 (no) 1999-07-30
HUP0003000A2 (hu) 2001-01-29
ID19842A (id) 1998-08-06
AU725230B2 (en) 2000-10-12
YU35899A (sh) 2001-12-26
EP0956736A2 (fr) 1999-11-17
EE9900306A (et) 2000-02-15
JP2001509985A (ja) 2001-07-24
MXPA99007004A (es) 2005-12-12
NZ336497A (en) 2000-01-28
PL334851A1 (en) 2000-03-27
ATE302538T1 (de) 2005-09-15
KR20000070079A (ko) 2000-11-25
CA2279602A1 (fr) 1998-08-06
UA42881C2 (uk) 2001-11-15
AR011597A1 (es) 2000-08-30
BG103576A (bg) 2000-03-31
EA001014B1 (ru) 2000-08-28
CO4771176A1 (es) 1999-04-30
ZA98782B (en) 1998-08-17
DE69831217T2 (de) 2006-06-08
BR9807534A (pt) 2000-06-06
TR199901805T2 (xx) 1999-09-21
NO993719L (no) 1999-09-29
EP0956736B1 (fr) 2005-08-17
TW374285B (en) 1999-11-11
IL130750A0 (en) 2000-06-01
AU5874098A (en) 1998-08-25
EA199900698A1 (ru) 2000-04-24
SK102299A3 (en) 2000-08-14
WO1998034320A2 (fr) 1998-08-06

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