TW381404B - Loudspeaker - Google Patents

Loudspeaker Download PDF

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Publication number
TW381404B
TW381404B TW087107236A TW87107236A TW381404B TW 381404 B TW381404 B TW 381404B TW 087107236 A TW087107236 A TW 087107236A TW 87107236 A TW87107236 A TW 87107236A TW 381404 B TW381404 B TW 381404B
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Taiwan
Prior art keywords
patent application
item
scope
vibration exciter
array
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TW087107236A
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Chinese (zh)
Inventor
Denis Morecroft
Neil Harris
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New Transducers Ltd
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • H04R9/066Loudspeakers using the principle of inertia
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/04Construction, mounting, or centering of coil
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2440/00Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/05Aspects relating to the positioning and way or means of mounting of exciters to resonant bending wave panels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/045Plane 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

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  • 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)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

A vibration exciter for imparting bending wave energy to a resonant panel, wherein the exciter is adapted to be coupled to the panel at a plurality of discrete positions forming a triangular array.

Description

A7 B1 五、發明説明(彳) 本發明係關於擴音器。具體但非絕對性言之,本發明係 關於施力5彎曲波能於諧振板而產生聲頻輸出類型之諧振板 式擴音器之電動振動激勵器。此種擴音器説明於吾等之國 際申請案WO97/09842。 激勵諧振擴音器板之振動激勵器需有容許驅動器功率至 彎曲波之最佳可能轉換之板表面上之固著形式(f〇rm 〇f fixture)。慣性反應激勵器藉對激勵器質量慣性反應而旖 加推/挽力於板。僅馬達牢固連接於板,及一具有細胞式心 體與集膚層之板之理想固著處爲大於板心體細胞尺度及具 有較板之心體對集膚結合強度爲.強固之連接之—單獨小位 置接觸。 一種已證明結構系統直接結合管狀音圈總成於板集膚而 達成與板之強圓形接觸。然而,當型尺度(111〇(1&1 dimensi〇ns) 到達圓形接觸區之尺度時,音圈下之大接觸區在限制板之 功率輸人之較高頻率有效反應。 / 本發明之一目的爲漸缓此等問題。 · 經濟部中央標华局員工消费合作社印敦 根據本發明、提供施彎曲波能於諧振板而產生聲頻輸出 之振動激勵器,激勵器在構成接觸片之三角形陣列之多個 分JL位置耦合於板。各分立耦合位置可.環繞一圓成間隔, 此圓可便利式對應於傳統式管狀音圈構成.件之端部形狀。 分工耦合位置可_將音圈構成件之端部製成凹口或堡堞 形(casteliating),’、或藉音圈連接於其上之安裝元件而產 生。此舉之效應爲接觸減小及原來閉合之圓周接觸敞開而 容許板中散佈之型彎曲波(m〇de bending wwes)在激勵器區 ' / ------------ 4 - 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公楚) 經濟部中央標隼局員工消费合作社印^ A7 一一 ______BJ_ 五、發明説明(2 ) 下通過。此一情況之一明顯結果爲激勵器”察覺"延伸至 較高頻 < 電阻機械性負載。 機械性最穩定構型爲成等距離之三個堡堞形,此點經數 學模型試驗確定。改變接觸片形狀自圓形段至直線形進— 步增加至板之型輸入。爲便利起見’可採用圓形接觸片。 以上之説明用活動線圈振動激勵器爲例揭示不連續接觸 之原理。然而’同一原理可應用於驅動元件與板間之中斷 或不連續形式物理連接之任何形式之振動ϋ器。 激勵器與板間之另外接觸可藉位於基本三角形陣列内之 就中心配置延伸元件例如十字形元件提供。 本發明以圖解方式例示性示..於附圖。 圖1爲以往技藝諧振板之部份圖,顯示振動激勵器與諧 振板間之安裝或連接區〇 圖2爲與圖1相同之部份圖,顯示根據本發明之第一種 具體實_例。 / 圖3爲連接於諧振板及與圖2相對應之振系激勵器之侧 視斷面圖。 圖4爲與圖1相同之圖,顯示根據本發明之第二種具體 實例。 圖5爲與圖1相同之圖,顯示根據本發明之第三種具體 實例。 , 圖6爲速接於板及對應於圖5之振動激勵器之側視 斷面圖。 圖1顯示國際專利申請案W0 97/0:9842中鮮明之類型之聲 本纸張尺度適用中國國家標準(CNS ) A4規格(210X297公釐} (請先閱讀+背面之注意事項4.填寫本頁}A7 B1 V. Description of the invention (i) The invention relates to a loudspeaker. Specifically, but not exclusively, the present invention relates to an electric vibration exciter of a resonant plate type loudspeaker of the type that produces a sound output by applying a bending wave energy of 5 to a resonant plate. Such a loudspeaker is described in our international application WO97 / 09842. The vibration exciter that excites the resonant loudspeaker board needs to have a fixed form on the surface of the board that allows the best possible conversion of driver power to bending waves (f0rm 0f fixture). Inertial response actuators push / pull on the board by inertial response to the mass of the actuator. Only the motor is firmly connected to the board, and the ideal fixation of a board with a cellular heart and skin layer is larger than the size of the heart of the board and the strength of the skin-to-skin binding of the board is stronger. —Individual small contact. A proven structural system directly combines the tubular voice coil assembly with the skin of the board to achieve strong circular contact with the board. However, when the type scale (111 ° (1 & 1 dimensioons) reaches the scale of the circular contact area, the large contact area under the voice coil effectively responds at a higher frequency that limits the power input of the plate. / This invention One purpose is to alleviate these problems. · According to the present invention, Indun, an employee consumer cooperative of the Central Standardization Bureau of the Ministry of Economic Affairs, provides a vibration exciter that applies bending wave energy to a resonant plate to generate an acoustic output. The multiple JL positions of the array are coupled to the board. Each discrete coupling position can be spaced around a circle. This circle can conveniently correspond to the shape of the end of a traditional tubular voice coil. The coupling position of the labor can be _ the voice coil The end of the component is made into a notch or casteliating, ', or a mounting element connected to it by a voice coil. The effect of this is to reduce the contact and open the originally closed circumferential contact to allow The bending bending wave (m〇de bending wwes) scattered in the plate is in the exciter area '/ ------------ 4-This paper size applies to China National Standard (CNS) A4 specification (210X297) ) Staff of Central Bureau of Standards, Ministry of Economic Affairs Consumption cooperative seal ^ A7 -11 ______BJ_ 5. The invention was passed under (2). One of the obvious results of this situation is that the exciter "senses" extends to higher frequency resistive mechanical loads. The most stable mechanical structure The shape is three fortresses of equal distance. This point is determined by mathematical model tests. Change the shape of the contact piece from a circular segment to a linear shape-it is added to the shape input of the plate. For convenience, a circular shape can be used. Contact sheet. The above explanation uses the moving coil vibration exciter as an example to reveal the principle of discontinuous contact. However, the same principle can be applied to any form of vibration device that has a discontinuous or discontinuous physical connection between the driving element and the board. Excitation The additional contact between the device and the plate can be provided by a centrally arranged extension element, such as a cross-shaped element, located in a basic triangular array. The present invention is illustrated schematically in the drawings .. Figure 1 is a part of a prior art resonant plate Figure, showing the installation or connection area between the vibration exciter and the resonance plate. Figure 2 is the same part as Figure 1, showing the first specific example according to the present invention. / Figure 3 It is a side cross-sectional view of a vibration system exciter connected to a resonance plate and corresponding to Fig. 2. Fig. 4 is the same diagram as Fig. 1 and shows a second specific example according to the present invention. Fig. 5 is the same as Fig. 1 The same figure shows a third specific example according to the present invention. Fig. 6 is a side sectional view of a quick-connected plate and a vibration exciter corresponding to Fig. 5. Fig. 1 shows the international patent application WO 97/0 : The distinct type of voice in 9842 This paper size is applicable to Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read + the note on the back 4. Fill out this page}

•1T f 經濟部中央樣局貞工消资合作社印聚 A7 ______ B? 五、發明説明(3 ) 頻裝置(1) ’包括諧振板形之聲頻元件(2),彎曲波能由一 振動激巧器(未示)加於其上,以便板(2)諧振而產生聲頻 輸出。如WO97/09842所説明,振動激勵器可包括具有直 接連接於板(2)之一面之一音圈之一活動線圈電動馬達。 圈或環(3)代表板(2)面上之音圈之接觸區或"足跡",或線 圈纏繞於其上之管狀構成件。本發明已確定爲有效發射彎 曲波能至板面保持音圈慣性於最小之此一連接方法導致群 爲"孔效應”("aperature effect")之副效應,f中板之最大頻 率響應係與激勵器與板(2)間接頭形成之環或圈(3)之直徑 相關連。本發明已證實至少潛在之另一效應,即板之環或 圈(3)内之部份能顯示二次諧振,稱爲"帽諧振。 本發明尋求至少減少發生孔效應及/或帽諧振。 一 參閲圖2至6及特別參閲圖2及3,本發明提供振動激勵 器(4)(見圖3及6 )在諧振板(2)上之安裝配置,以使板(2)之 諧振行爲不中斷或少於圖j之配置之安裝配置之中斷^ 況。 圖2顯TF —激勵器在板上成各分立接觸片(6)之圓形陣列 (5)之接觸區或足跡。穩定性之基本條件爲構成三角形之 一個接觸片,但本具體實例中,有増加強度之八個接觸片。 自圖3將明瞭,激勵器(4)爲國際專利申請案w〇97/〇9842之 圖lib所示類型之ψ性裝置,具有包括纏繞在圓筒形構成 件上之—線圈之音丨圈(11),音圈11)之一軸向端部驅動式 安裝於板(2),以發出彎曲波能至板内,及包圍音圈(11)及 包括夾置於配合在音圈(11)内之一極片與包圍音圈之一帽 一 ' / 一___ -6- 國國家標準(CNS ) A4規格(210X297公釐) ''^·-- (請先閲#背面之注意事項#-填寫本頁) 訂 .HT. 經濟部中央標準局貝工消费合作社印製 A7 --- -_B? 五、發明説明(4 ) 形第二極片(14)間之磁鐵(12)之磁體總成(12, u,14),磁 體總成$音圈内亦用於防塵功能之彈性吊懸件(15)連接。 音圈(11)之軸向端部(16)在環形安裝元件(9)中支持在板 上,元件(9)可爲一塑膠模製件。音圈之軸向端部(16)可用 膠黏劑連接於安裝元件(9),或另一種方式,安裝元件(9) 可直接模製在骨圈上。安裝元件之背向激勵器(4)之一側 (17)設製有自側邊(17)延伸及形成一環形陣列之一系列堡 堞形凸出部份(10),各堡堞型凸出部份(1〇)之琢面(ι8)形成共 同界定激勵器(4)在板(2)上足跡之分立接觸片(6)之陣列。 激勵器可用加於安裝件(9)之端面(18)之膠黏劑固定於板。 圖4之具體實例大致與圖2及3之具體實例相似,但陣列 (5a)中分立接觸片(6)之數目增加,及圓形陣列(5勾所界定 之區域另有爲改進激勵器與板間耦合之.配置於中心之另— 接觸(19)。接觸(19)之十字形係經選擇,因其爲徑向不連 續性,亦即不構成閉合圖形,因而無圖i之連續環形足跡/ 付板之彎曲波行爲之不利影響。 .* 圖5及6顯示與圖2及3之具體實例極相似之本發明之替 代性具體實例,係圖4之具體實例之變體。此例中,接觸 陣列(5a)修改成圖4之十字形另外接觸(19)被各分立接觸片 (21)1十罕形陣列(20)取代,以進_步減少由於激勵器安 裝座對彎曲波行爲f任何干擾。 分隔驅動接觸卤此爲改良激勵器與板間機械接合終端之 方法。可藉設計成調諧板輻射之上方頻率特性配合所選板 之特性而加以調整。接觸幾何形狀冬不同構型提供進一步 ___ ..____- _ 7 _ 本紙悵尺度適用中國國家標準(CNS ) 公楚) (請先閲t背面之注*.事項再填寫本頁) '裝. 訂 A7 B7 五、 帽 以 發明説明(5 精調某些情況下接觸面積、黏膠結合、板損失、孔效應及 帽諧振’數因數可相互作用之此界面之範圍。 立雖未示於圖中,但將明瞭,不藉堡堞形安裝元件(9)安裝 网圈於板上,可直接安裝音圈於板上而仍達成本發明之優 點。此-情況下,必須將音圈構成件之端部製成堡蝶形或 以他種方式修改而提供各分立安裝點之—環/堡堞形之端 部可-予以摺疊"X當用祕劑固定於黏時,形成増^接: 面積之凸緣而協助強化、 一 本發明提供固定振動激勵器於諧振板時減少孔及/或 效應之簡單方法。本發明雖無照活動線圈激鮮特別加以 説明,但應明暸,方法亦能應用於他種(非音圈)型式之 勵器而達成相同效果。 〜 (請先閲讀'背面之注意事項再填寫本頁j >_ -訂 經濟部中央標準局負工消f合作社印聚 8- 本紙張尺度適用中國國家標準(CNS ) Α4規格(21Qx 297公楚)• 1T f Yinju A7 ______ B, the Central Sample Bureau of the Ministry of Economic Affairs. 5. Description of the invention (3) Frequency device (1) 'Includes a resonant plate-shaped audio element (2). The bending wave energy is excited by a vibration. A smart device (not shown) is added to the board so that the board (2) resonates to generate an audio output. As described in WO97 / 09842, the vibration exciter may include a moving coil electric motor having a voice coil directly connected to one side of the plate (2). The loop or ring (3) represents the contact area or " footprint " of the voice coil on the surface of the plate (2), or the tubular component on which the coil is wound. The present invention has determined that this connection method of effectively transmitting bending wave energy to the surface of the board to keep the voice coil inertia to a minimum results in a side effect of the group "hole effect" ("aperature effect"), and the maximum frequency response of the plate in f It is related to the diameter of the ring or circle (3) formed by the joint between the exciter and the plate (2). The present invention has confirmed at least another potential effect, that is, the part of the ring or circle (3) of the plate can display The second resonance is called " cap resonance. The present invention seeks to reduce at least the occurrence of the hole effect and / or the cap resonance. Referring to Figures 2 to 6 and in particular to Figures 2 and 3, the present invention provides a vibration exciter (4) (See Figures 3 and 6) The installation configuration on the resonance plate (2), so that the resonance behavior of the plate (2) is not interrupted or less than that of the installation configuration of the configuration shown in Figure j. Figure 2 shows TF-excitation The device forms the contact area or footprint of the circular array (5) of the discrete contact pieces (6) on the board. The basic condition for stability is one contact piece constituting a triangle, but in this specific example, there are eight pieces of increased strength Contact sheet. As will be clear from Figure 3, the actuator (4) is an international patent application w97 / 〇9842 The ψ-type device of the type shown in FIG. Lib has an axial end drivingly mounted on a board including a coil coil (11) and a voice coil 11) wound on a cylindrical component ( 2) to emit bending wave energy into the board, and surround the voice coil (11) and include a pole piece sandwiched within the voice coil (11) and one of the caps surrounding the voice coil one '/ one ___- 6- National Standard (CNS) A4 Specification (210X297mm) ^^ --- (Please read #Notes on the back # -Fill this page) Order. HT. Printed by the Central Standards Bureau of the Ministry of Economic Affairs System A7 --- -_B? V. Description of the invention (4) The magnet assembly (12, u, 14) of the magnet (12) between the second pole pieces (14), the magnet assembly is also used in the voice coil Connected to the elastic suspension (15) with dustproof function. The axial end (16) of the voice coil (11) is supported on the board by the ring-shaped mounting element (9). The element (9) can be a plastic molded part The axial end (16) of the voice coil can be connected to the mounting element (9) with an adhesive, or in another way, the mounting element (9) can be directly molded on the bone ring. The mounting element is facing away from the exciter ( 4) One side (17) set There are a series of fortress-shaped protrusions (10) extending from the side (17) and forming a circular array, and the facets (ι8) of each fortress-like protrusions (10) form a collectively defined exciter (4) An array of discrete contact pieces (6) on the board (2). The actuator can be fixed to the board with an adhesive added to the end face (18) of the mounting member (9). The specific example of Figure 4 is roughly the same as The specific examples of Figures 2 and 3 are similar, but the number of discrete contacts (6) in the array (5a) is increased, and the area defined by the circular array (5 ticks) is additionally used to improve the coupling between the exciter and the board. The other center — contact (19). The cross shape of contact (19) was chosen because it is radial discontinuity, that is, it does not form a closed pattern, so there is no adverse effect of the continuous circular footprint / bending wave behavior of the plate i. . * Figs. 5 and 6 show alternative specific examples of the present invention which are very similar to the specific examples of Figs. 2 and 3, and are variants of the specific example of Fig. 4. In this example, the contact array (5a) is modified to the cross shape of FIG. 4 and the additional contact (19) is replaced by each discrete contact piece (21) and a ten-shaped array (20) to further reduce the number of pairs due to the actuator mounting seat. Bending wave behavior f any disturbance. Separating the drive contact halogen This is a method to improve the mechanical joint termination between the actuator and the board. It can be adjusted by designing the frequency characteristics above the radiation of the tuning board to match the characteristics of the selected board. Contact geometries in different configurations provide further ___..____- _ 7 _ This paper's dimensions are applicable to the Chinese National Standard (CNS). (Please read the note on the back of t first. Please fill in this page before filling in). Order A7 B7 5. The cap is explained with the invention (5 Fine-tune the range of this interface where the contact area, adhesive bond, plate loss, hole effect, and cap resonance 'factor can interact in some cases. Although not shown in the figure Medium, but it will be clear that instead of mounting the mesh coil on the board by the fortress-shaped mounting element (9), the voice coil can be directly mounted on the board and still achieve the advantages of the invention. In this case, the voice coil component must be The ends are made into a butterfly shape or modified in other ways to provide separate installation points-the ends of the ring / fort shape can be folded-"X is fixed when the adhesive is fixed to the adhesive, forming a 接 ^ connection : The flange of the area assists in strengthening. A simple method for reducing holes and / or effects when fixing the vibration exciter in the resonance plate is provided by the present invention. Although the present invention is specifically explained without a moving coil excitation, it should be clear that the method is also Can be applied to other types of (non-voice coil) exciters The same effect. ~ (Please read 'Notes on the back before filling in this page j > _-Order the Ministry of Economic Affairs, Central Bureau of Standards, Consumer Affairs, Cooperatives, and Cooperative Printing 8]-This paper size applies the Chinese National Standard (CNS) Α4 specifications ( 21Qx 297)

Claims (1)

AB B8 C8 D% S81404 申請專利範圍 l.種振動激勵器,用以施加彎曲波能於諧振板,激勵器 在構成三角形陣列之多個分立位置耦合於板。 2 ·根據申請專利範圍第1項之振動激勵器,其中該陣列包 括位於一圓之周邊之三個以上分立位置。 3.根據申請專利範園第1或2項之振動激勵器,包括在三爲 形陣列内之位於中心之至少一另外耦合位置。 4·根據申請專利範圍第3項之振動激勵器,其中該另外轉 合位置爲十字形。 — 5.根據申請專利範圍第4項之振動激勵器,其中該十字形 包括各分立耦合位置之一陣列。 6·根據申請專利範圍第項之振動激勵器,包括設製有界 定各分立耦合位置之各凸出部份之一安裝元件。 7·根據申請專利範圍第6項之振動激勵器,其中該安裝元 件爲環形。 8.根據申請專利範圍第6項之振動激勵器,包括一活動^ 圈電動馬達,及該安裝元件連接於音圈 9·根據申請專利範圍第1項之振動激勵器,其中該激勵器 爲一慣性裝ιΓ。 經濟部中央標準局員工消費合作衽印製 10· ·•'種擴音器,包括根據申請專利範圍第1項之一振動激 勵器。 U·根據申請專利範户第10項之擴音器,包括諳振板形式之 —聲頻’元件。〆 國國家標準(CMS ) A4規格(21〇><297公釐AB B8 C8 D% S81404 Patent Application Scope l. A vibration exciter for applying bending wave energy to a resonant plate. The exciter is coupled to the plate at a plurality of discrete positions forming a triangular array. 2. The vibration exciter according to item 1 of the scope of patent application, wherein the array includes three or more discrete locations located on the periphery of a circle. 3. The vibration exciter according to item 1 or 2 of the patent application park, including at least one additional coupling position at the center in the three-shaped array. 4. The vibration exciter according to item 3 of the scope of patent application, wherein the additional turning position is cross-shaped. — 5. The vibration exciter according to item 4 of the patent application scope, wherein the cross includes an array of discrete coupling positions. 6. The vibration exciter according to item 1 of the scope of patent application, including a mounting element provided with a protruding portion defining each discrete coupling position. 7. The vibration exciter according to item 6 of the patent application scope, wherein the mounting element is ring-shaped. 8. The vibration exciter according to item 6 of the scope of patent application, including a movable ^ -coil electric motor, and the mounting element is connected to the voice coil 9. The vibration exciter according to item 1 of the scope of patent application, wherein the exciter is a Inertia device ιΓ. The consumer cooperation of the Central Bureau of Standards of the Ministry of Economic Affairs printed 10 types of loudspeakers, including vibration exciters according to one of the scope of patent application. U. A loudspeaker according to item 10 of the patent application, including an "audio" element in the form of a vibrating plate. 〆 National Standard (CMS) A4 Specification (21〇 > < 297 mm
TW087107236A 1997-05-10 1998-05-11 Loudspeaker TW381404B (en)

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GBGB9709438.7A GB9709438D0 (en) 1997-05-10 1997-05-10 Loudspeaker transducer

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CO4780082A1 (en) 1999-05-26
KR20010012364A (en) 2001-02-15
BR9809609A (en) 2000-07-04
DK0988775T3 (en) 2002-01-07
JP2002505813A (en) 2002-02-19
IL132587A0 (en) 2001-03-19
HK1024134A1 (en) 2000-09-29
WO1998052383A1 (en) 1998-11-19
EP0988775A1 (en) 2000-03-29
PT988775E (en) 2002-03-28
DE69801755D1 (en) 2001-10-25
EP0988775B1 (en) 2001-09-19
CN1255278A (en) 2000-05-31
DE69801755T2 (en) 2002-05-29
CA2290103A1 (en) 1998-11-19
AR012678A1 (en) 2000-11-08
ATE205993T1 (en) 2001-10-15
ZA983836B (en) 1999-01-25
AU734941B2 (en) 2001-06-28
ID20950A (en) 1999-04-01
ES2164423T3 (en) 2002-02-16
AU7343698A (en) 1998-12-08
GB9709438D0 (en) 1997-07-02

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