JP3842798B2 - Speaker - Google Patents

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JP3842798B2
JP3842798B2 JP2004160931A JP2004160931A JP3842798B2 JP 3842798 B2 JP3842798 B2 JP 3842798B2 JP 2004160931 A JP2004160931 A JP 2004160931A JP 2004160931 A JP2004160931 A JP 2004160931A JP 3842798 B2 JP3842798 B2 JP 3842798B2
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metal
voice coil
plate
speaker
heat
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JP2005341475A (en
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隆史 小松原
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Foster Electric Co Ltd
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Foster Electric Co Ltd
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この発明は、音響機器の一種であるスピーカ等の電気音響変換器にかかり、詳しくはボイスコイルの放熱性を向上させた高耐入力型のスピーカに関する。   The present invention relates to an electroacoustic transducer such as a speaker, which is a kind of acoustic equipment, and more particularly to a high input-resistant speaker with improved heat dissipation of a voice coil.

従来の電気音響変換器の一般的な構成は、中心部にポールピースを一体に結合されたボトムプレートの前面に環状のマグネットを結合し、さらに環状のトッププレートを結合し、トッププレートの前面にフレームを結合し、ポールピースと環状のトッププレートとの間に形成した磁気ギャップに、その磁気ギャップにはまり込むボイスコイルを中心部に結合したダンパーの周縁部を前記フレームに結合し、さらに前記ボイスコイルを中心部に結合した振動板の周縁部を前記フレームに結合し、その中心部にダストキャップを設けた構造となっている。   The general configuration of a conventional electroacoustic transducer is to connect an annular magnet to the front surface of a bottom plate integrally joined to a pole piece at the center, and further connect an annular top plate to the front surface of the top plate. A frame is joined, and a damper is joined to a magnetic gap formed between the pole piece and the annular top plate, and a voice coil that fits in the magnetic gap is joined to the center. The peripheral part of the diaphragm having the coil joined to the center part is joined to the frame, and a dust cap is provided at the center part.

上記従来の構成による電気音響変換器では、ボイスコイルからの発熱は磁気回路のトッププレート、ボトムプレート等により放熱されていたが、大入力を連続して加えると、ボイスコイルの温度が上昇し、磁気回路自体が高温となり、充分な放熱ができなくなり、最悪の場合にはボイスコイルが温度上昇に耐えられなくなって断線するという課題を有していた。   In the electroacoustic transducer having the above-described conventional configuration, the heat generated from the voice coil is radiated by the top plate, the bottom plate, etc. of the magnetic circuit, but when a large input is continuously applied, the temperature of the voice coil rises, The magnetic circuit itself has a high temperature and cannot sufficiently dissipate heat. In the worst case, the voice coil cannot withstand the temperature rise and has a problem of disconnection.

このため、図６に示すように、プレート７’の前面に設けたフレーム１４’からの放熱やプレート７’前面に放熱用金属部品８’を設置して、放熱する構造の電気音響変換器が各種開発されているが、プレート７’前面からの放熱用金属部品８’だけでは、ボイスコイル１０’からの発熱を充分に放熱することができず、ボイスコイル１０’が熱破壊するおそれがあった。この図６に示すような先行例としては、実開昭６２−１７８６９１がある。
実開昭６２−１７８６９１ For this reason, as shown in FIG. 6, there is an electroacoustic transducer having a structure in which heat is dissipated from a frame 14 'provided on the front surface of the plate 7' or a heat dissipating metal component 8 'is disposed on the front surface of the plate 7'. Although various developments have been made, the heat radiation from the voice coil 10 ′ cannot be sufficiently radiated only by the heat radiating metal part 8 ′ from the front surface of the plate 7 ′, and the voice coil 10 ′ may be thermally destroyed. It was. As a prior example as shown in FIG. 6, there is Japanese Utility Model Publication No. 62-178691.
Japanese Utility Model Sho 62-178691

本発明は上記従来の課題を解決し、大入力化を図ったスピーカにおいてもボイスコイルの異常な温度上昇を抑制し、ボイスコイルからの発熱を上下ほぼ均等に集熱して外部へ放熱でき、大入力によるボイスコイルの熱破壊限界を高め、安定した性能を発揮することが可能な高耐入力型のスピーカを提供することを目的とするものである。   The present invention solves the above-described conventional problems, suppresses an abnormal temperature rise of the voice coil even in a speaker with a large input, collects heat from the voice coil almost evenly, and dissipates it to the outside. An object of the present invention is to provide a highly input-resistant speaker capable of increasing the thermal destruction limit of a voice coil by input and exhibiting stable performance.

請求項１記載の発明は、ボトムプレート２ａ前面にマグネット３が設けられたポールピース２と、このポールピース２の外周面と磁気ギャップ９を介し内周面が対向配置されたプレート７とを備え、前記磁気ギャップ９内にボイスコイル１０が設けられたスピーカにおいて、前記プレート７の上下面にそれぞれ第１、第２の金属放熱体４、８を設け、その内端部を前記ボイスコイル１０と離間して対向配置し、前記第１，第２の金属放熱体（４）、（８）の内端部は縦断面がそれぞれほぼＬ字状をなし、その折曲部（５ａ）、（８ａ）がボイスコイル（１０）と対向配置され、かつ前記第１の金属放熱体（４）の内端部に縦断面がほぼＬ字状をなす内側金属リング（５）が設けられ、その折曲部（５ａ）がボイスコイル（１０）と対向配置され、かつ第１の金属放熱体（４）はスポーク構造をなし、スポーク（４ｃ）は前記プレート（７）の下面に形成された凹部（７ａ）内に収納された構成として上記目的を達成している。
請求項２記載の発明は、請求項１記載において、前記第１、第２の金属放熱体４、８の外端部は前記プレート７より外側に突出し、かつ第１の金属放熱体４の外端部には放熱用金属フィン６を設けたことに特徴を有する。 The invention described in claim 1 includes a pole piece 2 having a magnet 3 provided on the front surface of the bottom plate 2a, and a plate 7 having an outer peripheral surface of the pole piece 2 and an inner peripheral surface disposed opposite to each other with a magnetic gap 9 interposed therebetween. In the speaker in which the voice coil 10 is provided in the magnetic gap 9, first and second metal radiators 4 and 8 are provided on the upper and lower surfaces of the plate 7, respectively, and inner ends thereof are connected to the voice coil 10. The inner end portions of the first and second metal radiators (4) and (8) are substantially L-shaped, and the bent portions (5a) and (8a) ) Is disposed opposite to the voice coil (10), and an inner metal ring (5) having a substantially L-shaped longitudinal section is provided at the inner end of the first metal radiator (4). Part (5a) is placed opposite to voice coil (10) And the first metal heat radiator (4) forms a spoke structure, spokes (4c) is to achieve the above objects as configurations accommodated in the formed in the recess (7a) to the lower surface of said plate (7) Yes.
According to a second aspect of the present invention, in the first aspect, the outer end portions of the first and second metal radiators 4 and 8 protrude outward from the plate 7 and are outside the first metal radiator 4. A feature is that a metal fin 6 for heat dissipation is provided at the end.

請求項１記載の発明によれば、プレート７をサンドイッチ状に挟持するようその上下にそれぞれ第１、第２の金属放熱体４、８を設けたため、ボイスコイル１０からの発熱を上下ほぼ均等に効率よく集熱し、放熱するので、大入力によるボイスコイル１０の温度上昇は一定に抑えられる。このため、より大入力を加えることが可能となり、高耐入力のスピーカを実現できる。   According to the first aspect of the present invention, the first and second metal radiators 4 and 8 are provided on the upper and lower sides of the plate 7 so as to sandwich the plate 7 so that the heat generated from the voice coil 10 is substantially evenly distributed. Since heat is efficiently collected and radiated, the temperature rise of the voice coil 10 due to a large input can be kept constant. For this reason, it becomes possible to apply a larger input, and a speaker with high input resistance can be realized.

また、ボイスコイル１０と対向する第１、第２の金属放熱体４、８の内端部をほぼＬ字状とし、対向面を大きくしたため、ボイスコイル１０から発生する熱を効率良く集熱することができる。 Further , since the inner end portions of the first and second metal radiators 4 and 8 facing the voice coil 10 are substantially L-shaped and the facing surface is enlarged, the heat generated from the voice coil 10 is efficiently collected. be able to.

さらに、第１の金属放熱体４の内端部にほぼＬ字状の内側金属リング５を設けたため、集熱性が良く、かつ第１の金属放熱体４をプレート７下面の凹部７ａに配設したため、熱を凹部７ａ内の金属放熱体４に沿って放熱させることができ、かつ磁気回路１の厚み増大を防止し得る。 In addition , since the substantially L-shaped inner metal ring 5 is provided at the inner end of the first metal radiator 4, heat collection is good and the first metal radiator 4 is disposed in the recess 7 a on the lower surface of the plate 7. Therefore, heat can be radiated along the metal radiator 4 in the recess 7a, and an increase in the thickness of the magnetic circuit 1 can be prevented.

請求項２記載の発明によれば、上記放熱効果に加え、２つの金属放熱体４、８の外端部をプレート７より外側に突出させ、第１の金属放熱体４の外端部に放熱用金属フィン６を設けたため、熱を効率良く外部へ放熱することができる。 According to the invention described in claim 2 , in addition to the heat dissipation effect, the outer ends of the two metal radiators 4, 8 protrude outward from the plate 7, and heat is radiated to the outer end of the first metal radiator 4. Since the metal fins 6 are provided, heat can be efficiently radiated to the outside.

以下、図面に沿って本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

［実施の形態１］
図１は本発明の一実施例の縦断面図を示す。 [Embodiment 1]
FIG. 1 shows a longitudinal sectional view of an embodiment of the present invention.

図中１は磁気回路で、この磁気回路１は、図示の状態において、下方に円板状のボトムプレート２ａが形成され、このボトムプレート２ａの中央部に一体に結合され、上方に向って延びるほぼ中空円筒状をなすポールピース２を備えている。   In the figure, reference numeral 1 denotes a magnetic circuit. In the state shown in the drawing, the magnetic circuit 1 is formed with a disk-shaped bottom plate 2a on the lower side, and is integrally coupled to the central portion of the bottom plate 2a and extends upward. A pole piece 2 having a substantially hollow cylindrical shape is provided.

ボトムプレート２ａの前面には環状のマグネット３が設けられ、このマグネット３の前面には環状の第１の金属放熱体４が設けられている。この第１の金属放熱体４の内端下部には内側金属性リング５が設けられている。また、外端部には歯車のように凹凸状をなす放熱用金属フィン６が設けられている。   An annular magnet 3 is provided on the front surface of the bottom plate 2 a, and an annular first metal radiator 4 is provided on the front surface of the magnet 3. An inner metallic ring 5 is provided at the lower end of the inner end of the first metal radiator 4. Further, a heat dissipating metal fin 6 having an uneven shape like a gear is provided at the outer end portion.

図２は第１の金属放熱体４の平面図、図３は側面図、図４は底面図を示す。この第１の金属放熱体４はスポーク構造をなし、内側環状部４ａと、この外側に配設された同心円状の外側環状部４ｂとを有し、内、外の各環状部４ａ、４ｂ間は放射状の複数本のスポーク４ｃによって連結され、外側環状部４ｂの外周部には凹凸をなす放熱用金属フィン６が形成されている。なお、スポーク４ｃは図示例のように６本に限定されるものでなく、適宜増減し得る。 2 is a plan view of the first metal radiator 4, FIG. 3 is a side view, and FIG. 4 is a bottom view. The first metal heat dissipating body 4 has a spoke structure and has an inner annular portion 4a and a concentric outer annular portion 4b disposed on the outer side, between the inner and outer annular portions 4a and 4b. Are connected by a plurality of radial spokes 4c, and metal fins 6 for heat dissipation are formed on the outer periphery of the outer annular portion 4b . Contact name spokes 4c is not limited to six as in the illustrated example, it may be appropriately increased or decreased.

図１において７は環状のプレートで、後面に第１の金属放熱体４を収納する溝状をなす凹部７ａが複数本形成されている。凹部７ａはプレート７後面の内端部から外端にかけて放射状に形成され、これらの凹部７ａ内に第１の金属放熱体４の各スポーク４ｃが位置され、金属放熱体４による磁気回路の遮断なしに金属放熱体４が設置できる。 In FIG. 1, reference numeral 7 denotes an annular plate having a plurality of concave portions 7a each having a groove shape for accommodating the first metal radiator 4 on the rear surface. The recesses 7a are formed radially from the inner end to the outer end of the rear surface of the plate 7, and the spokes 4c of the first metal radiator 4 are located in these recesses 7a so that the magnetic radiator 4 does not block the magnetic circuit. The metal heat radiating body 4 can be installed on the surface.

この図１は図２中Ａ−Ａ’線に対応したスピーカ断面で、スポーク４ｃが凹部７ａ内に収納された状態を示す。また、第１の金属放熱体４の内側環状部４ａの前面側の突部（図３参照）もプレート７の内側に形成された環状の凹部（図示せず）内に収納される。図２中Ｂ−Ｂ’線に対応したスピーカ断面は図５に示す。図５に示すように、マグネット３の前面は凹部７ａ以外のプレート７下面に接合されている。   FIG. 1 is a cross-sectional view of the speaker corresponding to the line A-A ′ in FIG. 2 and shows a state where the spoke 4 c is housed in the recess 7 a. In addition, a protrusion (see FIG. 3) on the front side of the inner annular portion 4 a of the first metal radiator 4 is also housed in an annular recess (not shown) formed inside the plate 7. A cross section of the speaker corresponding to the line B-B 'in FIG. 2 is shown in FIG. As shown in FIG. 5, the front surface of the magnet 3 is joined to the lower surface of the plate 7 other than the recess 7a.

また、図１、図５に示すように、プレート７の内端部後面はほぼＬ字状をなし、下部に内側金属性リング５の前面内端部が接合されている。第１の金属放熱体４と接続された内側金属性リング５はほぼＬ字状をなし折曲部５ａは環状をなしている。   As shown in FIGS. 1 and 5, the rear surface of the inner end portion of the plate 7 is substantially L-shaped, and the inner end portion of the front surface of the inner metallic ring 5 is joined to the lower portion. The inner metallic ring 5 connected to the first metal radiator 4 is substantially L-shaped and the bent portion 5a is annular.

さらに、プレート７の前面には環状の第２の金属放熱体８が設けられている。この第２の金属放熱体８の内端部もほぼＬ字状に形成され、折曲部８ａは環状をなしている。なお、この第２の金属放熱体８はスポーク構造をなすものではない。   Further, an annular second metal radiator 8 is provided on the front surface of the plate 7. The inner end portion of the second metal radiator 8 is also formed in an approximately L shape, and the bent portion 8a has an annular shape. The second metal radiator 8 does not have a spoke structure.

また、環状のマグネット３の前面に結合した環状のプレート７の内周面とポールピース２との間には磁気ギャップ９が形成され、この磁気ギャップ９内に円筒状のボイスコイル１０が振動可能に配設されている。   In addition, a magnetic gap 9 is formed between the inner peripheral surface of the annular plate 7 coupled to the front surface of the annular magnet 3 and the pole piece 2, and a cylindrical voice coil 10 can vibrate in the magnetic gap 9. It is arranged.

このボイスコイル１０に対し第２の金属放熱体８の中心部、すなわち折曲部８ａが離間して対向配置され、かつ第２の金属放熱体８の外端部、すなわち周縁部は好ましくはプレート７の外端部より外側に突設されている。   The central portion of the second metal radiator 8, that is, the bent portion 8 a, is spaced apart from the voice coil 10, and the outer end portion, that is, the peripheral portion of the second metal radiator 8 is preferably a plate. 7 projecting outward from the outer end portion.

ボイスコイル１０と離間して対向配置された第２の金属放熱体８の内端部をほぼＬ字状とし折曲部８ａを形成したのはボイスコイル１０との対向面を増大させ、ボイスコイル１０の熱を効率良く集熱するようにしたためである。また、第２の金属放熱体８の外端部をプレート７より好ましくは外側に突出させたのは、放熱効果を高めるようにしたためである。   The inner end of the second metal heat dissipating body 8 that is disposed opposite to and separated from the voice coil 10 is substantially L-shaped, and the bent portion 8a is formed to increase the surface facing the voice coil 10 and the voice coil. This is because the heat of 10 is efficiently collected. Further, the reason why the outer end portion of the second metal heat dissipating body 8 protrudes more preferably outward than the plate 7 is to enhance the heat dissipating effect.

第１の金属放熱体４の中心部、すなわち内端部の下方に設けられた内側金属性リング５も集熱性を高めるためにほぼＬ字状に形成され、その折曲部５ａをボイスコイル１０と離間して対向配置したのも集熱性を高めるためである。   An inner metallic ring 5 provided at the center of the first metal radiator 4, that is, below the inner end portion, is also formed in an approximately L shape in order to enhance heat collection, and the bent portion 5 a is formed as a voice coil 10. The reason is that they are spaced apart from each other in order to improve heat collecting performance.

なお、第１，第２の金属放熱体４、８はアルミニウムや銅などの熱伝導性の良い材料からなっている。また、内側金属リング５も同様の材質にて形成される。   The first and second metal radiators 4 and 8 are made of a material having good thermal conductivity such as aluminum or copper. The inner metal ring 5 is also formed of the same material.

また、ボイスコイル１０は円筒状をなすボイスコイルボビン１１の後方外周面に設けられている。このボイスコイルボビン１１にはダンパ１２の内端部が結合され振動可能に支持されているとともに、ボイスコイルボビン１１の前部はコーン状の振動板１３の首部１３ａに結合され、振動板１３を駆動するように構成されている。 The voice coil 10 is provided on the rear outer peripheral surface of the voice coil bobbin 11 having a cylindrical shape. The voice coil bobbin 11 is coupled to the inner end of the damper 12 so as to be able to vibrate, and the front part of the voice coil bobbin 11 is coupled to the neck 13 a of the cone-shaped diaphragm 13 to drive the diaphragm 13. Is configured to do.

第２の金属放熱体８の前面には椀状をなし、窓ａが形成されたフレーム１４の底面１４ａが結合され、フレーム１４の段部１４ｂにダンパ１２の外周部が支持され、フレーム１４の前部１４ｃに振動板１３の外周部がエッジ１５を介し支持され、スピーカが構成される。   A front surface of the second metal radiator 8 has a bowl shape, and a bottom surface 14a of the frame 14 in which the window a is formed is coupled. An outer peripheral portion of the damper 12 is supported by a step portion 14b of the frame 14. The outer peripheral part of the diaphragm 13 is supported by the front part 14c via the edge 15, and a speaker is comprised.

動作にあたっては、ボイスコイル１０に音声信号を入力するとそれに応じて振動板１３が振動する。   In operation, when an audio signal is input to the voice coil 10, the diaphragm 13 vibrates accordingly.

この場合、ボイスコイル１０は大入力を連続的に加えると発熱する。   In this case, the voice coil 10 generates heat when a large input is continuously applied.

本発明では、プレート７の前後に第１、第２の金属放熱体４、８を設け、プレート４をサンドイッチ状に挟持し、ボイスコイル１０からの発熱を上下ほぼ均等に集熱するようにし、第１の金属放熱体４の内端部にほぼＬ字状の内側金属性リング５を設け、その折曲部５ａおよび第２の金属放熱体８のほぼＬ字状の折曲部８ａをボイスコイル１０と対面させ、ボイスコイル１０の発熱を速やかに集熱し、プレート７の下面に設けた凹部７ａに沿って第１の金属放熱体４にて熱を導き外端部に設けた放熱用金属フィン６を介し外部へ放熱するとともに、第２の金属放熱体８によっても集熱し、放熱するように構成している。   In the present invention, the first and second metal radiators 4 and 8 are provided before and after the plate 7, the plate 4 is sandwiched, and the heat generated from the voice coil 10 is collected almost evenly, A substantially L-shaped inner metallic ring 5 is provided at the inner end of the first metal radiator 4, and the bent portion 5 a and the substantially L-shaped bent portion 8 a of the second metal radiator 8 are voiced. The heat-dissipating metal provided at the outer end faced to the coil 10 to quickly collect the heat generated by the voice coil 10 and lead the heat by the first metal radiator 4 along the recess 7a provided on the lower surface of the plate 7 The heat is radiated to the outside through the fins 6 and is also collected and radiated by the second metal radiator 8.

なお、上記実施例において、第１の金属放熱体４と内側金属リング５とを一体形成しても良いことは勿論である。   Of course, in the above embodiment, the first metal radiator 4 and the inner metal ring 5 may be integrally formed.

本発明の一実施例の図２中Ａ−Ａ’線に対応したスピーカ断面を示す。FIG. 3 shows a cross section of the speaker corresponding to the line A-A ′ in FIG. 2 according to one embodiment of the present invention. 本発明で用いられる第１の金属放熱体の平面図を示す。The top view of the 1st metal heat radiator used by this invention is shown. 同上の側面図を示す。The side view same as the above is shown. 同上の底面図を示す。A bottom view is shown. 図２中Ｂ−Ｂ’線に対応したスピーカ断面を示す。The speaker cross section corresponding to the B-B 'line in FIG. 2 is shown. 従来例の断面説明図を示す。Sectional explanatory drawing of a prior art example is shown.

符号の説明Explanation of symbols

１ 磁気回路
２ ポールピース
２ａ ボトムプレート
３ マグネット
４ 第１の金属放熱体
４ａ 内側環状部
４ｂ 外側環状部
４ｃ スポーク
５ 内側金属性リング
５ａ 折曲部
６ 放熱用金属フィン
７ プレート
７ａ 凹部
８ 第２の金属放熱体
９ 磁気ギャップ
１０ ボイスコイル
１１ ボイスコイルボビン
１２ ダンパ
１３ 振動板
１３ａ 首部
１４ フレーム
１４ａ 底面
１４ｂ 段部
１４ｃ 前部
１５ エッジ DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Pole piece 2a Bottom plate 3 Magnet 4 1st metal heat dissipating body 4a Inner annular part 4b Outer annular part 4c Spoke 5 Inner metallic ring 5a Bending part 6 Heat radiation metal fin 7 Plate 7a Recessed part 8 Second Metal radiator 9 Magnetic gap 10 Voice coil 11 Voice coil bobbin 12 Damper 13 Diaphragm 13a Neck 14 Frame 14a Bottom 14b Step 14c Front 15 Edge

Claims (2)

ボトムプレート（２ａ）前面にマグネット（３）が設けられたポールピース（２）と、このポールピース（２）の外周面と磁気ギャップ（９）を介し内周面が対向配置されたプレート（７）とを備え、前記磁気ギャップ（９）内にボイスコイル（１０）が設けられたスピーカにおいて、
前記プレート（７）の上下面にそれぞれ第１、第２の金属放熱体（４）、（８）を設け、その内端部を前記ボイスコイル（１０）と離間して対向配置し、前記第１，第２の金属放熱体（４）、（８）の内端部は縦断面がそれぞれほぼＬ字状をなし、その折曲部（５ａ）、（８ａ）がボイスコイル（１０）と対向配置され、かつ前記第１の金属放熱体（４）の内端部に縦断面がほぼＬ字状をなす内側金属リング（５）が設けられ、その折曲部（５ａ）がボイスコイル（１０）と対向配置され、かつ第１の金属放熱体（４）はスポーク構造をなし、スポーク（４ｃ）は前記プレート（７）の下面に形成された凹部（７ａ）内に収納されたことを特徴とするスピーカ。 A pole piece (2) provided with a magnet (3) on the front surface of the bottom plate (2a), and a plate (7) having an inner peripheral surface opposed to the outer peripheral surface of this pole piece (2) via a magnetic gap (9) And a speaker provided with a voice coil (10) in the magnetic gap (9),
First and second metal radiators (4) and (8) are provided on the upper and lower surfaces of the plate (7), respectively, and the inner ends thereof are spaced apart from the voice coil (10), and are arranged to face each other . The inner end portions of the first and second metal radiators (4) and (8) are substantially L-shaped in longitudinal section, and the bent portions (5a) and (8a) face the voice coil (10). An inner metal ring (5) having a substantially L-shaped longitudinal section is provided at the inner end of the first metal radiator (4), and the bent portion (5a) is a voice coil (10). ) And the first metal radiator (4) has a spoke structure, and the spoke (4c) is housed in a recess (7a) formed on the lower surface of the plate (7). Speaker. 請求項１記載のスピーカにおいて、前記第１、第２の金属放熱体（４）、（８）の外端部は前記プレート（７）より外側に突出し、かつ第１の金属放熱体（４）の外端部には放熱用金属フィン（６）が設けられたことを特徴とするスピーカ。   The speaker according to claim 1, wherein outer end portions of the first and second metal radiators (4), (8) protrude outward from the plate (7), and the first metal radiator (4). The speaker is characterized in that a heat dissipating metal fin (6) is provided at the outer end of the speaker.
JP2004160931A 2004-05-31 2004-05-31 Speaker Expired - Fee Related JP3842798B2 (en)

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JP2015039161A (en) 2013-07-19 2015-02-26 株式会社Ｊｖｃケンウッド Magnetic circuit for speaker

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