JP2004023297A

JP2004023297A - Coil bobbin and conductivity-1 turn ring and speaker arrangement

Info

Publication number: JP2004023297A
Application number: JP2002173239A
Authority: JP
Inventors: Yoshio Ohashi; 大橋　芳雄
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 2002-06-13
Filing date: 2002-06-13
Publication date: 2004-01-22

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil bobbin, a conductivity-1 turn ring and a speaker arrangement in which unwanted vibration is removed and a quality of an acoustic signal is excellent to a high tone area by improving a strength in or near a flat linking part for linking a middle dome-like diaphragm and an edge-like diaphragm in a diaphragm of a speaker. <P>SOLUTION: An acoustic diaphragm 5 of the speaker arrangement is composed of a dome-like diaphragm 11, an edge-like diaphragm 13, and a flat linking part 12 for linking both the diaphragms, and a reinforcing ring bonded to the coil bobbin or to one end face of the conductivity-1 turn ring in advance is bonded from a lower face of the flat part to or near the flat linking part so that the mechanical strength of the flat linking part 12 in the acoustic diaphragm 5 is improved. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、各種音響機器や映像機器等に用いて有用なボイスコイルボビン及び導電性１ターンリング並びにこれらの可動部材が使用される動電型或は動電型電磁誘導スピーカ装置に関する。
【０００２】
【従来の技術】
従来の動電型のスピーカ装置の音響振動板及びコイルボビンは、例えば図１２に示す様に中央にドーム形状のドーム状振動板１２１を有すると共に、このドーム状振動板１２１の円形辺縁から断面形状が所定の凹又は凸の曲率を有するように又は直線状のエッジ状振動板１２９を一体に高分子フィルムや金属等で構成している。
【０００３】
この音響振動板１２０のドーム状振動板１２１とエッジ状振動板１２９とを一体化する連結部にはボイスコイル１２３を巻回したコイルボビン１２２を垂下する様に接合して、磁気空隙を形成するギャップ１２７内にボイスコイル１２３を上下に揺動可能に配設させる。
【０００４】
スピーカ装置を構成するフレームは、金属からなる円盤状の下側のプレート上に配設したリング状のマグネット１２４と、下側プレートの略中央部に立設した円柱状のポールピース１２５と、マグネット１２４上に載置固定した金属性のリング状の上側のプレート１２６と、エッジ状振動板１２９の外周縁が固定される円筒状フレームで構成され、上側のプレート１２６の内周とポールピース１２５の外周間に形成されたギャップ１２７中にコイルボビン１２２（以下ボビンと記す）に巻回したボイスコイル１２３が配設されて動電型のスピーカ装置が構成される。
【０００５】
この様なスピーカ装置の信号入力線１２８に音響信号が入力されると、ギャップ１２７の磁界内に配したボイスコイル１２３はギャップ１２７内で上下に揺動する駆動力を生じて、音響振動板１２０を振動させて音響信号を放音させる。
【０００６】
上述の如き例えば、動電型スピーカ装置ではボビン１２２と音響振動板１２０との従来の接合方法は図１３に示す様に成されている。図１３は図１２のＡ部拡大図を示すものであり、円筒状のボビン１２２にボイスコイル１２３が巻回される側と反対側の一端は音響振動板１２０のドーム状振動板１２１のドーム振動板内周縁１３３に接着剤１３１により接着させる。
【０００７】
この音響振動板１２０はドーム状振動板１２１の辺縁から立ち下がったドーム振動板内周縁１３３の下端から直角に折り曲げられた連結部を構成する連結平坦部１３２を介して凸状の曲線状断面あるいは直線状断面を持つエッジ状振動板１２９の振動板辺縁１３４に連設され、この振動板辺縁１３４は円筒状のフレームに固定される。
【０００８】
一方、動電型電磁誘導スピーカでは振動板の駆動手段として動作するボビン１２２に巻回するボイスコイル１２３の代わりに導電性１ターンリングを巻回したり、円筒状で均一な直径の導電性１ターンリングの上方端部を直接音響振動板１２０のドーム振動板内周縁１３３に接着剤１３１により接着させるように成したものも提案されている。
【０００９】
上述のような小型で高域（例えば１００ｋＨｚ）まで再生可能な動電型スピーカあるいは動電型電磁誘導スピーカによるとドーム状振動板１２１とエッジ状振動板１２９を有する音響振動板１２０は薄い金属シート、例えば、アルミニウム、チタニウム、或は高分子シート等を一体成型して得られるものであったため、ドーム状振動板１２１とエッジ状振動板１２９を連結する連結平坦部１３２の金属シート、高分子シートは成形時に、ドーム状振動板１２１およびエッジ状振動板１２９側の両方向に引っ張られるため厚さが薄くなって、機械的強度が弱くなる不都合があった。
【００１０】
また、図１３に示す様なボビン１２２あるいは導電性１ターンリングをドーム振動板内周縁１３３に接着し、音響信号を入力すると、所定の周波数では、薄くて、機械的強度の弱い連結平坦部１３２を節としてドーム状振動板１２１とエッジ状振動板１２９が１８０度位相のずれた振動を生ずる。この周波数ではドーム状振動板１２１から生じた音響信号とエッジ状振動板１２９から生じた音響信号が互いに打ち消し合い、音圧のディップを生じるという不都合があった。特に、このディップが可聴帯域にある場合には音響信号の品質を低下させるという不都合があった。
【００１１】
さらに、２０ｋＨｚ以上の高い周波数においては、ボビン１２２あるいは導電性１ターンリングからの駆動力が、接着剤１３１および機械的強度の弱い連結平坦部１３２により吸収されてしまい、エッジ状振動板１２９に伝達されなくなってしまう。これにより２０ｋＨｚ以上の高い周波数では必要な音圧が得られないという課題があった。
【００１２】
【発明が解決しようとする課題】
これらの課題を解決するために本発明者らは先に、特開２０００−１５６８９６号公報において、図１４に示すように、接着剤１３１を音響振動板１２０の連結平坦部１３２の幅に合わせて塗布し、連結平坦部１３２にボビン１２２を固定することにより連結平坦部１３２の機械的強度を増加させているが、この場合ボビン１２２の一端の幅ｔが連結平坦部１３２の幅ｔ′より薄いので接合し難く、接着剤１３１で補強しているが接着剤の塗布条件により強度にばらつきが生じてしまう問題が生ずる。
【００１３】
また、上記公報では図１５に示す様な導電性１ターンリング１４１を駆動手段として用いる場合も披瀝している。導電性１ターンリング１４１はそれ自体の電気抵抗を小さくするために、その端面の幅ｔはボビン１２２の場合より大きくなる。この場合、ドーム状振動板１２１とエッジ状振動板１２９とを連結する連結平坦部１３２の幅ｔ′を導電性１ターンリング１４１の端面の幅ｔと略等しくすることにより、さらにこの部分の機械的強度の増大を図ることができるが、実際のスピーカ装置の設計では連結平坦部１３２の幅ｔ′を非常に広くとることは出来ない。例えば、導電性１ターンリング１４１の幅ｔを連結平坦部１３２の幅ｔ′に合わせようとすると、磁気空隙、即ち、ギャップ１２７の幅も広くする必要を生じて音圧感度を小さくする不都合を生ずる。
【００１４】
更に、上記公報では図１６に示す様なボイスコイル１２３を巻回したボビン１２２の一端にボビン１２２の縦軸方向と直交する方向に折曲部１３５を形成し、この折曲部１３５を振動板１２０の連結平坦部１３２の底部に接着剤１３１を介して接合させる様にしたスピーカ装置も示されている。この様なボビン１２２では駆動系の等価質量を小さくするためにボビン１２２に質量の小さいフィルム等を用いるため折曲部１３５の形成が極めて困難であり、振動板１２０の連結平坦部１３２で折曲部１３５にて充分な強度が得にくくなる課題を生じた。
【００１５】
本発明は叙上の課題を解決するために成されたもので、本発明が解決しようとする課題は、音響振動板の連結平坦部、或は連結平坦部近傍のドーム振動板内周縁に補強用リングを接合させたボビン或は導電性１ターンリングを枢着させて連結平坦部の強度を高め、ドーム状振動板とエッジ状振動板との間で生ずる１８０°位相のずれた振動の発生を除去すると共に、ボイスコイルや導電性１ターンリングから音響振動板に伝達させた時に音圧感度が小さくならず、高音域まで音響信号の品質が良好なスピーカ装置を得ると共に、ボビンや導電性１ターンリングの作製が簡単で接着剤の塗布にばらつきを生ずることなく、振動板の連結平坦部との接合時の接着強度が大きい可動部材及びスピーカ装置を得る様にしたものである。
【００１６】
【課題を解決するための手段】
本発明は、ドーム状振動板とエッジ状振動板を連結する連結平坦部とが一体に形成された振動板の連結平坦部に導電性１ターンリング或はコイルボビンの一端に形成したリング部材を接合させたコイルボビン又は導電性１ターンリングを接合させた、コイルボビン及び導電性１ターンリング並びにスピーカ装置を提供するものである。
【００１７】
斯かる、本発明のコイルボビン及び導電性１ターンリング並びにスピーカ装置によれば連結平坦部あるいは連結平坦部近傍をコイルボビンに接合した補強用リングで補強したので、機械的強度の弱かったドーム状振動板とエッジ状振動板とを連結する連結平坦部の強度が増加して、ドーム状振動板とエッジ状振動板との１８０度位相のずれた振動を除去するとともに、コイルボビンや導電性１ターンリングからの駆動力をエッジ状振動板に伝達させることで、高音域、（例えば、１００ｋＨｚ）までの高域の再生を可能とすることができる。又、等価質量の小さいボイスボビンや導電性１ターンコイルを簡単に作成できて、振動板の連結平坦部に強固に接合可能なものが得られる。
【００１８】
【発明の実施の形態】
以下に、本発明のスピーカ装置の各実施の形態を図面を用いて説明する。図１は本発明を動電型電磁誘導スピーカに適用した側断面図を示したものであり、図２は図１に示す動電型電磁誘導スピーカの等価回路を示すものである。
【００１９】
図１に於いて、スピーカ装置１はフレーム部および音響振動板ならびに駆動手段で構成される。
【００２０】
フレームは、円盤状の金属より成る下面プレート２ａの略中心位置に下面プレート２ａと一体に成形し、下面プレート径より小径の円柱状のポールピース２が立設され、このポールピース２の外周を囲繞するように同心円状のマグネット６を下面プレート２ａに接合させる。
【００２１】
さらに、マグネット６上に同心円状に形成した金属より成る盤状の上面プレート７を接合させる。上面プレート７の外周に嵌め込まれた円筒状フレーム１０を上面プレート７と一体化させて、フレーム部が構成される。
【００２２】
音響振動板５は後述するように、中央の凸状のドーム状振動板と、このドーム状振動板の辺縁から断面形状が曲率Ｒを有するように又は直線状のエッジ状振動板とで構成される。
【００２３】
また、電磁誘導型スピーカの駆動手段はポールピース２あるいは図示しないがポールピース２上に固定した円盤状のポールピースプレートに絶縁して巻回された励磁用１次コイル３ａと、上面プレート７の内周とポールピース２の外径間に形成されるギャップ８内に音響振動板５の後述する連結平坦部から垂下したボビン４の内径に嵌着させた導電性１ターンリング３を電磁誘導可能に対向配置させ、信号入力線９を介して音響入力信号等の駆動電流を供給すると、励磁用１次コイル３ａに流れる電流が変化してマグネット６および励磁用１次コイル３ａによる磁界が変化することにより、導電性１ターンリング３に誘導電流が流れ、電磁力により導電性１ターンリング３が上下振動するので、これに対応して音響振動板５が振動する。
【００２４】
図２は図１に示した動電型電磁誘導スピーカの誘導部の等価回路を示すもので、図１に示した励磁用１次コイル３ａに相当する入力インピーダンスＺｉｎの１次側の抵抗Ｒ_１及びインダクタンスＬ_１に音響入力信号に相当する電圧Ｖ_１が印加されると電流Ｉ_１が流れ、導電性１ターンリング３に相当する２次側の抵抗Ｒ_２及びインダクタンスＬ_２に相互インダクタンスＭによる誘導によって出力信号に相当する電流Ｉ_２が流れることで導電性１ターンリング３が上下動する駆動力を生じて音響振動板５から音響信号を放音させることができる。
【００２５】
以下、図３乃至図６を用いて、音響振動板及びボイスコイルボビン等の駆動手段の取付方法を説明する。
【００２６】
図３は音響振動板５と駆動手段である導電性１ターンリングを一部断面とした斜視図であり、図１５に示したと同様の駆動手段（導電性１ターンリングのみ）を有するもので音響振動板５は金属材料、例えば、アルミニウム、チタニウム等のシート状の材料あるいは、高分子材料から成るシート状の材料をプレス加工することで一体に構成され、中央部には略半球状のドーム状振動板１１を有し、このドーム状振動板１１の外周に連続した連結平坦部１２と、該連結平坦部１２の外周に連続した断面形状で略円弧状あるいは直線状をなすエッジ状振動板１３と、該エッジ状振動板１３の外周に連続して形成した円筒状フレーム１０に取り付けられるエッジを構成する振動板辺縁１４とから構成される。
【００２７】
上述の音響振動板５のドーム状振動板１１とエッジ状振動板１３を連結する連結平坦部１２は図５に示すドーム状振動板１１の外周から垂下する様に延びるリング状のドーム振動板内周縁（以下内周部と記す）１２ａと、該内周部１２ａの下縁に水平方向に延設した平面部１２ｂと、該平面部１２ｂの終縁部に連続して形成されたエッジ状振動板１３とで構成される。
【００２８】
上述の連結平坦部１２の平面部１２ｂはプレス加工による一体成形時にドーム状振動板１１とエッジ状振動板１３との両方向に引っ張られるため薄くプレスされることになる。
【００２９】
また、動電型電磁誘導スピーカでは駆動手段としての２次側のコイルとして図１５に示すような導電性１ターンリング３あるいはボビン４の内周或は外周に導電性１ターンリング３を装着したボビン４を平坦部１２ｂの下面にエポキシ樹脂系の接着剤１６にて接合されている。このようなボビン４および導電性１ターンリング３は振動系を軽くするため非常に軽いシートを用いているため極力厚みの薄いシートが用いられる。このためボビン４あるいは導電性１ターンリング３の端面の厚みは連結平坦部１２の平面部１２ｂの幅より狭くなっていて接着剤１６による平面部１２ｂに接合するボビン４および導電性１ターンリング３の一端面での補強効果は期待できない。
【００３０】
そこで、本発明では図３乃至図６に示すように連結用平坦部１２に図４に示すようなボビン４および導電性１ターンリング３に補強用リング１５接合させた駆動系を用いて平面部１２ｂの強度を補強するように成す。図４は本発明に用いる駆動系の導電性１ターンリングに補強用リングを接合させる状態を説明するための斜視図、図５は図３のＣ部拡大断面図を示すものである。
【００３１】
図４に示す本発明の導電性１ターンリング３にアルミニウム、チタニウム、高分子シート等のシートあるいは紙等から構成した補強用リング１５の幅ｗを音響振動板５の連結平坦部１２の平面部１２ｂの幅に合わせて作成し、この補強用リング１５を導電性１ターンリング３に嵌挿し図４に示す様に導電性１ターンリング３の上部端面から所定高さＨだけ離れた破線で示す接合位置１８に接着剤１６を介して接着固定し、この導電性１ターンリング３と一体化した補強用リング１５を連結平坦部１２の平面部１２ｂの底面に接着剤１６を介して接着固定することで連結平坦部１２の機械的強度を増加させている。補強用リング１５の材質は音響振動板５と同じであってもよいし、違ってもかまわない。音響振動板５と同じ材質の場合には、厚さは音響振動板５の厚さ以上が好ましい。材質が音響振動板５と異なる場合には、貼り合わせた部分の強度が音響振動板５の材質の２倍の厚さの強度以上になるような厚さが好ましい。
【００３２】
図５は図４に示した導電性１ターンリング３に接合した補強用リング１５を連結平坦部１２の平面部１２ｂ及び内周部１２ａに接着剤１６を介して接合させる様にしたものでより強固に連結平坦部１２に導電性１ターンリング３を固定させることができる。この場合、導電性１ターンリング３の上端面からの高さＨは振動板５の連結平坦部１２の内周部１２ａの高さに等しいか、それ以下に選択する。
【００３３】
図６は図５と同様の要部拡大図の他の接合方法を示す側断面図であり、図６の場合は動電型電磁誘導スピーカとして用いる導電性１ターンリング３は図５の様に振動系に直接、接合固定されるのでなく、シート状のボビンの内周又は外周に導電性１ターンリング３を配設したものである。
【００３４】
即ち、図６に於いてはボビン４の下端に導電性１ターンリング３を巻回し、ボビン４の上端面に接して金属或は高分子等で形成した２個の補強用リング１５ａ及び１５ｂをボビン４の外径及び内径に予め接着剤１６を介して接合しておき、駆動系の組立時に図６の様に連結平坦部１２の平面部１２ｂの底面に内外周補強用リング１５ａ及び１５ｂを接合固定させたものである。
【００３５】
また、スピーカの駆動系としては上述の構成では動電型電磁誘電スピーカについて説明したが図１２で示すように通常のボビンにボイスコイルを巻回した動電型スピーカにも、本発明を適用し得ることは明らかである。
【００３６】
さらに図７乃至図９を用いて、上述の動電型スピーカに適用した本発明の他の構成を説明する。図７は本発明に用いる駆動系の構成を示す補強用リングを有するボビンの側面図、図８は本発明に用いる補強用リングを有するボビンの他の構成を示す斜視図、図９は図１のＤ部分と同様の他の構成を示す側断面図である。
【００３７】
図７は駆動系として通常の動電型スピーカに用いるボビン４に巻回したボイスコイル１７の巻回位置と反対側に補強用リング１５をボビン４の上端面から所定の高さＨだけ離間した位置に接着剤を介してボビン４の外径側に接合させたものである。
【００３８】
補強用リング１５は音響振動板１１と同一の高分子フィルムやチタニウム等の金属フィルムを内径がボビン４の外径に略等しく、リング幅ｗが連結平坦部１２の平面部の幅ｗ_１と略等しく選択すると共に補強用リング１５の巻回位置は補強用リング１５の上縁とボビン４の上端面間の高さＨを連結平坦部１２の内周部１２ａの立ち上がりの高さと略等しく選択して、図７に示す様にボビン４の高さＨで示す外径部分を内周部に図９（Ａ）の様に接着剤１６を介して接合すると共に補強用リング１５のリング幅ｗ部分にも接着剤１６を塗布して連結平坦部１２の平面部１２ｂの底面に接合させたものである。
【００３９】
図８に示すものは図７に示す補強用リング１５を高分子フィルム等のテープを用いてボビン４の補強用リング１５の取付位置に１〜２ターン巻回させながら接合固定させたものである。この場合のボビン４も図９（Ａ）に示す様に平面部１２ｂと内周部１２ａに接着剤１６を介して簡単に接合可能である。
【００４０】
図９（Ｂ）及び図９（Ｃ）に示すものは図６と図９（Ａ）とに示すものと同様にボビン４の内径に導電性１ターンリング３を嵌挿固定したものと、ボビン４に通常のボイスコイル１７を巻回した駆動系を用いたボビン４の上端面の内径又は外径に夫々補強用リング１５ａ及び１５ｂを接着剤１６を介して接合させたものを連結平坦部１２の平面部１２ｂの底面に接着剤１６で接着固定させた場合を示している。
【００４１】
以下、図１０および図１１の音圧−周波数特性を用いて本発明と従来の特性差を説明する。
【００４２】
図１０は図１で説明した動電型電磁誘導スピーカの音圧−周波数特性を有限要素法を用いて計算した結果を示すものである。音響振動板５の連結平坦部１２の幅ｗは略０．２５ｍｍに対し導電性１ターンコイル用のボビン４の厚みｗ′は０．０５ｍｍを用い、補強用リング１５の幅ｗ_１もｗ＝ｗ_１とし音響振動板５と同一材料、同一厚を用いて計算を行なっている。図１０で縦軸は音圧レベル（ｄＢ）、横軸は１０ｋＨｚ乃至１００ｋＨｚまでの周波数をとっている。
【００４３】
上述の音圧−周波数特性に依ると１０ｋＨｚ〜１００ｋＨｚまで、略平坦なレベルの周波数特性が得られ、４０ｋＨｚ以下での音圧も、後述する従来構成に比べて大きなレベル低下がみられずボビン４からの駆動力が位相反転等を起こさず効率よくエッジ状振動板１３に伝達されている。
【００４４】
図１１は、図１４で説明したスピーカの音圧−周波数特性の有限要素法により計算した結果である。連結平坦部１３２の幅は０．２５ｍｍに対してボビン１２２の厚さは０．０５ｍｍと非常に小さくなっている場合である。約４０ｋＨｚ以上では急激な音圧の低下が見られる。この場合には連結平坦部１３２の強度が不十分なために、４０ｋＨｚ以上の高い周波数ではボビン１２２による駆動力が充分にエッジ状振動板１２９に伝達できないため、音響振動板１２０から音響出力への変換が効率良く行なわれていない。
【００４５】
【発明の効果】
本発明のスピーカ装置によればドーム状振動板とエッジ状振動板とを連結する連結平坦部を有する振動板の連結平坦部あるいは連結平坦部近傍の下側から強度を高めるため補強用リングを接合させたボイスボビン或は導電性１ターンリングを連結平坦部あるいは連結平坦部とその近傍に接合させたので連結平坦部の機械的強度が高められ、不要振動が除去され、接着剤を塗布する場合に比べて作成し易く、効率よく音響出力変換を行なうことができ高域の１００ｋＨｚまで略平坦に再生可能なボイスボビン及び導電性１ターンリング並びに動電型のスピーカ装置を得られる効果を有する。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態を示すスピーカ装置の側断面図である。
【図２】図１の動作説明用の等価回路図である。
【図３】本発明の第２の実施の形態を示すスピーカ装置の一部を断面とする斜視図である。
【図４】本発明のスピーカ装置に用いる第１の実施の形態を示す補強用リングの組立方法を説明するための斜視図である。
【図５】図３のＣ部拡大断面図である。
【図６】図１のＤ部拡大断面図である。
【図７】本発明の第２の実施の形態を示す補強リング付ボイスボビンの側面図である。
【図８】本発明のスピーカ装置に用いる第３の実施の形態を示す補正用リング付ボイスボビンの斜視図である。
【図９】図１及び図６と同様のボイスボビンを振動板に接合する方法の種々の形態を示す側断面図である。
【図１０】本発明のスピーカ装置の音圧−周波数特性曲線である。
【図１１】従来のスピーカ装置の音圧−周波数特性曲線である。
【図１２】従来のスピーカ装置の側断面図である。
【図１３】図１２のＡ部の拡大側断面図である。
【図１４】図１２のＡ部の他の構成を示す拡大側断面図である。
【図１５】図１２のＡ部の更に他の構成を示す拡大側断面図（Ｉ）である。
【図１６】図１３のＡ部の更に他の構成を示す拡大側断面図（ＩＩ）である。
【符号の説明】
１‥‥スピーカ装置、２‥‥励磁用一次コイル、３‥‥導電性１ターンリング、５‥‥音響振動板、１１‥‥ドーム状振動板、１２‥‥連結平坦部、１２ａ‥‥内周部、１２ｂ‥‥平面部、１３‥‥エッジ状振動板、１５，１５ａ，１５ｂ，１５ｃ‥‥補強用リング、１６‥‥接着剤、１７‥‥ボイスコイル[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a voice coil bobbin, a conductive one-turn ring, and an electrodynamic or electrodynamic electromagnetic induction speaker device using these movable members, which are useful for various audio equipment and video equipment.
[0002]
[Prior art]
An acoustic diaphragm and a coil bobbin of a conventional electrodynamic speaker device have a dome-shaped diaphragm 121 having a dome shape in the center as shown in FIG. 12, for example, and have a sectional shape from a circular edge of the dome-shaped diaphragm 121. Have a predetermined concave or convex curvature, or the linear edge-shaped diaphragm 129 is integrally formed of a polymer film, metal, or the like.
[0003]
A coil bobbin 122 wound with a voice coil 123 is joined to a connecting portion of the acoustic diaphragm 120 that integrates the dome-shaped diaphragm 121 and the edge-shaped diaphragm 129 so as to hang down to form a magnetic gap. The voice coil 123 is arranged in the 127 so as to be able to swing up and down.
[0004]
The frame constituting the speaker device includes a ring-shaped magnet 124 disposed on a disk-shaped lower plate made of metal, a columnar pole piece 125 erected substantially at the center of the lower plate, and a magnet. A metal ring-shaped upper plate 126 placed and fixed on the upper surface 124 and a cylindrical frame to which an outer peripheral edge of the edge-shaped diaphragm 129 is fixed. A voice coil 123 wound around a coil bobbin 122 (hereinafter, referred to as a bobbin) is provided in a gap 127 formed between the outer peripheries, thereby constituting an electrodynamic speaker device.
[0005]
When an acoustic signal is input to the signal input line 128 of such a speaker device, the voice coil 123 disposed in the magnetic field of the gap 127 generates a driving force that swings up and down in the gap 127, and the acoustic diaphragm 120 Vibrates to emit an acoustic signal.
[0006]
As described above, for example, in the electrodynamic speaker device, a conventional joining method of the bobbin 122 and the acoustic diaphragm 120 is performed as shown in FIG. FIG. 13 is an enlarged view of a portion A of FIG. 12, and one end of the cylindrical bobbin 122 opposite to the side on which the voice coil 123 is wound is a dome vibration of the dome-shaped diaphragm 121 of the acoustic diaphragm 120. It is bonded to the inner peripheral edge 133 of the plate with an adhesive 131.
[0007]
The acoustic diaphragm 120 has a convex curved cross section via a connecting flat portion 132 which forms a connecting portion bent at a right angle from a lower end of the inner peripheral edge 133 of the dome diaphragm falling from an edge of the dome-shaped diaphragm 121. Alternatively, it is provided continuously to the diaphragm edge 134 of the edge-shaped diaphragm 129 having a linear cross section, and the diaphragm edge 134 is fixed to a cylindrical frame.
[0008]
On the other hand, in the case of the electrodynamic electromagnetic induction speaker, a conductive one-turn ring is wound instead of the voice coil 123 wound around the bobbin 122 that operates as a driving means of the diaphragm, or a cylindrical conductive one-turn having a uniform diameter is used. There has also been proposed one in which the upper end of the ring is directly bonded to the inner peripheral edge 133 of the dome diaphragm 133 of the acoustic diaphragm 120 with an adhesive 131.
[0009]
According to the electrodynamic speaker or electrodynamic induction speaker which is small and can reproduce up to a high frequency (for example, 100 kHz) as described above, the acoustic diaphragm 120 having the dome-shaped diaphragm 121 and the edge-shaped diaphragm 129 is a thin metal sheet. For example, since it is obtained by integrally molding aluminum, titanium, or a polymer sheet or the like, a metal sheet or a polymer sheet of the connection flat portion 132 connecting the dome-shaped diaphragm 121 and the edge-shaped diaphragm 129 is formed. During molding, it is pulled in both directions on the dome-shaped diaphragm 121 and the edge-shaped diaphragm 129 side, so that the thickness is reduced and the mechanical strength is disadvantageously reduced.
[0010]
Further, when a bobbin 122 or a conductive one-turn ring as shown in FIG. 13 is adhered to the inner peripheral edge 133 of the dome diaphragm and an acoustic signal is inputted, at a predetermined frequency, the connecting flat portion 132 which is thin and has low mechanical strength is provided. As a node, the dome-shaped diaphragm 121 and the edge-shaped diaphragm 129 generate vibrations 180 degrees out of phase. At this frequency, the acoustic signal generated from the dome-shaped diaphragm 121 and the acoustic signal generated from the edge-shaped diaphragm 129 cancel each other, resulting in a problem that a sound pressure dip occurs. In particular, when the dip is in the audible band, there is a disadvantage that the quality of the acoustic signal is reduced.
[0011]
Further, at a high frequency of 20 kHz or more, the driving force from the bobbin 122 or the conductive one-turn ring is absorbed by the adhesive 131 and the connection flat portion 132 having low mechanical strength, and is transmitted to the edge-shaped diaphragm 129. Will not be done. As a result, there is a problem that a required sound pressure cannot be obtained at a high frequency of 20 kHz or more.
[0012]
[Problems to be solved by the invention]
In order to solve these problems, the present inventors have previously described in Japanese Patent Application Laid-Open No. 2000-156896 the adhesive 131 by adjusting the width of the connecting flat portion 132 of the acoustic diaphragm 120 as shown in FIG. The mechanical strength of the connection flat portion 132 is increased by coating and fixing the bobbin 122 to the connection flat portion 132. In this case, the width t at one end of the bobbin 122 is thinner than the width t 'of the connection flat portion 132. Therefore, it is difficult to join them, and they are reinforced with the adhesive 131. However, there is a problem that the strength varies depending on the application condition of the adhesive.
[0013]
The above publication also discloses a case in which a conductive one-turn ring 141 as shown in FIG. 15 is used as a driving means. The width t of the end surface of the conductive one-turn ring 141 is larger than that of the bobbin 122 in order to reduce the electric resistance of itself. In this case, the width t 'of the connecting flat portion 132 connecting the dome-shaped diaphragm 121 and the edge-shaped diaphragm 129 is made substantially equal to the width t of the end face of the conductive one-turn ring 141, so that the mechanical part of this portion is further improved. However, the width t 'of the connecting flat portion 132 cannot be made very wide in an actual speaker device design. For example, if the width t of the conductive one-turn ring 141 is to be adjusted to the width t ′ of the connection flat portion 132, it is necessary to increase the width of the magnetic gap, that is, the gap 127. Occurs.
[0014]
Further, in the above publication, a bent portion 135 is formed at one end of the bobbin 122 around which the voice coil 123 is wound as shown in FIG. 16 in a direction perpendicular to the longitudinal direction of the bobbin 122, and the bent portion 135 is formed as a diaphragm. Also shown is a speaker device that is bonded to the bottom of the connection flat portion 132 of the connector 120 via an adhesive 131. In such a bobbin 122, since a film or the like having a small mass is used for the bobbin 122 in order to reduce the equivalent mass of the driving system, it is extremely difficult to form the bent portion 135. There was a problem that it was difficult to obtain sufficient strength at the portion 135.
[0015]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the problem to be solved by the present invention is to reinforce the connecting flat portion of the acoustic diaphragm or the inner peripheral edge of the dome diaphragm near the connecting flat portion. A 180 ° phase-shifted vibration between the dome-shaped diaphragm and the edge-shaped diaphragm is generated by pivotally connecting a bobbin or a conductive one-turn ring with a connecting ring to increase the strength of the connecting flat part. The sound pressure sensitivity is not reduced when the sound is transmitted from the voice coil or the conductive one-turn ring to the acoustic diaphragm, and a speaker device having good sound signal quality up to a high frequency range is obtained. It is an object of the present invention to obtain a movable member and a speaker device in which the manufacture of a one-turn ring is simple, the application of an adhesive does not vary, and the adhesive strength at the time of joining with a connecting flat portion of a diaphragm is large.
[0016]
[Means for Solving the Problems]
The present invention relates to a connecting flat portion of a diaphragm in which a connecting flat portion connecting a dome-shaped diaphragm and an edge-shaped diaphragm is integrally formed, and joining a conductive one-turn ring or a ring member formed at one end of a coil bobbin to the connecting flat portion. An object of the present invention is to provide a coil bobbin, a conductive one-turn ring, and a speaker device in which the coil bobbin or the conductive one-turn ring is joined.
[0017]
According to the coil bobbin, the conductive one-turn ring, and the speaker device of the present invention, the connecting flat portion or the vicinity of the connecting flat portion is reinforced by the reinforcing ring joined to the coil bobbin, so that the dome-shaped diaphragm has low mechanical strength. The strength of the connecting flat portion connecting the edge-shaped diaphragm and the edge-shaped diaphragm is increased, and the 180-degree phase-shifted vibration of the dome-shaped diaphragm and the edge-shaped diaphragm is removed, and the coil bobbin and the conductive one-turn ring are removed. By transmitting the driving force to the edge-shaped diaphragm, reproduction in a high-frequency range, for example, a high-frequency range (for example, 100 kHz) can be performed. In addition, a voice bobbin and a conductive one-turn coil having a small equivalent mass can be easily formed, and a product that can be firmly joined to the connecting flat portion of the diaphragm can be obtained.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the speaker device of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view in which the present invention is applied to an electrodynamic electromagnetic induction speaker, and FIG. 2 shows an equivalent circuit of the electrodynamic electromagnetic induction speaker shown in FIG.
[0019]
In FIG. 1, a speaker device 1 includes a frame unit, an acoustic diaphragm, and driving means.
[0020]
The frame is formed integrally with the lower plate 2a at substantially the center of the lower plate 2a made of a disc-shaped metal, and a columnar pole piece 2 having a smaller diameter than the lower plate diameter is erected. The concentric magnet 6 is joined to the lower plate 2a so as to surround it.
[0021]
Further, a disc-shaped upper plate 7 made of a metal formed concentrically is joined to the magnet 6. The frame portion is formed by integrating the cylindrical frame 10 fitted on the outer periphery of the upper surface plate 7 with the upper surface plate 7.
[0022]
As will be described later, the acoustic diaphragm 5 is composed of a central convex dome-shaped diaphragm, and a linear edge-shaped diaphragm having a curvature R in section from the edge of the dome-shaped diaphragm. Is done.
[0023]
The driving means of the electromagnetic induction type speaker includes an exciting primary coil 3 a wound insulated on a pole piece 2 or a disc-shaped pole piece plate (not shown) fixed on the pole piece 2, and an upper plate 7. A conductive one-turn ring 3 fitted to the inner diameter of a bobbin 4 hanging from a connecting flat portion described later of the acoustic diaphragm 5 can be electromagnetically induced in a gap 8 formed between the inner circumference and the outer diameter of the pole piece 2. When a driving current such as an acoustic input signal is supplied through the signal input line 9, the current flowing through the primary coil for excitation 3 a changes, and the magnetic field generated by the magnet 6 and the primary coil for excitation 3 a changes. As a result, an induced current flows through the conductive one-turn ring 3, and the conductive one-turn ring 3 vibrates up and down due to the electromagnetic force, so that the acoustic diaphragm 5 vibrates correspondingly.
[0024]
FIG. 2 shows an equivalent circuit of an inductive section of the electrodynamic electromagnetic induction speaker shown in FIG. 1, and a resistor R ₁ on a primary side of an input impedance Zin corresponding to the exciting primary coil 3a shown in FIG. and the voltages V ₁ corresponding to the acoustic input signal to the inductance L ₁ is applied current I ₁ flows, due to the mutual inductance M to the resistor R ₂ and the inductance L ₂ of the secondary side corresponding to the conductive 1-turn ring 3 can be sound an acoustic signal from the acoustic diaphragm 5 conductive 1-turn ring 3 by current I ₂ corresponding to the output signal by induction flow is caused a driving force for vertical movement.
[0025]
Hereinafter, a method of attaching the driving means such as the acoustic diaphragm and the voice coil bobbin will be described with reference to FIGS.
[0026]
FIG. 3 is a perspective view partially showing the acoustic diaphragm 5 and a conductive one-turn ring which is a driving means, and has a driving means (only a conductive one-turn ring) similar to that shown in FIG. The diaphragm 5 is integrally formed by pressing a sheet material such as a metal material, for example, aluminum or titanium, or a sheet material made of a polymer material, and has a substantially hemispherical dome shape at the center. A connecting flat portion 12 having a vibrating plate 11 and continuous to the outer periphery of the dome-shaped vibrating plate 11, and an edge-shaped vibrating plate 13 having a substantially arc-shaped or linear cross-sectional shape continuous to the outer periphery of the connecting flat portion 12 And a peripheral edge 14 of the diaphragm constituting an edge attached to the cylindrical frame 10 formed continuously on the outer periphery of the edge-shaped diaphragm 13.
[0027]
The connecting flat portion 12 connecting the dome-shaped diaphragm 11 and the edge-shaped diaphragm 13 of the above-described acoustic diaphragm 5 has a ring-shaped dome diaphragm extending downward from the outer periphery of the dome-shaped diaphragm 11 shown in FIG. A peripheral edge (hereinafter referred to as an inner peripheral portion) 12a, a flat portion 12b extending horizontally below a lower edge of the inner peripheral portion 12a, and an edge-shaped vibration continuously formed at a terminal edge portion of the flat portion 12b. And a plate 13.
[0028]
The flat portion 12b of the connection flat portion 12 is pulled thin in both directions of the dome-shaped diaphragm 11 and the edge-shaped diaphragm 13 at the time of integral molding by press working, so that it is pressed thinly.
[0029]
In the electrodynamic electromagnetic induction speaker, the conductive one-turn ring 3 or the conductive one-turn ring 3 is mounted on the inner or outer periphery of the bobbin 4 as shown in FIG. The bobbin 4 is joined to the lower surface of the flat portion 12b with an epoxy resin adhesive 16. Since the bobbin 4 and the conductive one-turn ring 3 use very light sheets in order to make the vibration system light, a thin sheet is used as much as possible. For this reason, the thickness of the end face of the bobbin 4 or the conductive one-turn ring 3 is smaller than the width of the flat part 12b of the connection flat part 12, and the bobbin 4 and the conductive one-turn ring 3 are joined to the flat part 12b by the adhesive 16. The reinforcement effect at one end cannot be expected.
[0030]
Therefore, in the present invention, as shown in FIGS. 3 to 6, a flat portion is formed by using a drive system in which the bobbin 4 and the conductive one-turn ring 3 are joined to the reinforcing flat portion 15 as shown in FIG. 12b to reinforce the strength. FIG. 4 is a perspective view for explaining a state in which a reinforcing ring is joined to the conductive one-turn ring of the drive system used in the present invention, and FIG. 5 is an enlarged sectional view of a portion C in FIG.
[0031]
The width w of the reinforcing ring 15 made of a sheet of aluminum, titanium, a polymer sheet or the like or a sheet of paper or the like is added to the conductive one-turn ring 3 of the present invention shown in FIG. The reinforcing ring 15 is inserted into the conductive one-turn ring 3 and is indicated by a broken line separated from the upper end surface of the conductive one-turn ring 3 by a predetermined height H as shown in FIG. Attachment position 18 is bonded and fixed via adhesive 16, and reinforcing ring 15 integrated with conductive one-turn ring 3 is bonded and fixed to the bottom surface of flat portion 12 b of connection flat portion 12 via adhesive 16. Thus, the mechanical strength of the connection flat portion 12 is increased. The material of the reinforcing ring 15 may be the same as that of the acoustic diaphragm 5, or may be different. When the same material as the acoustic diaphragm 5 is used, the thickness is preferably equal to or greater than the thickness of the acoustic diaphragm 5. When the material is different from that of the acoustic diaphragm 5, it is preferable that the thickness of the bonded portion be equal to or greater than twice the thickness of the material of the acoustic diaphragm 5.
[0032]
FIG. 5 shows a structure in which the reinforcing ring 15 joined to the conductive one-turn ring 3 shown in FIG. 4 is joined to the flat portion 12b and the inner peripheral portion 12a of the connecting flat portion 12 via the adhesive 16. The conductive one-turn ring 3 can be firmly fixed to the connection flat part 12. In this case, the height H from the upper end surface of the conductive one-turn ring 3 is selected to be equal to or less than the height of the inner peripheral portion 12a of the connecting flat portion 12 of the diaphragm 5.
[0033]
FIG. 6 is a side sectional view showing another joining method similar to that of FIG. 5 in an enlarged view of a main part. In the case of FIG. 6, a conductive one-turn ring 3 used as an electrodynamic electromagnetic induction speaker is provided as shown in FIG. Instead of being directly bonded and fixed to the vibration system, a conductive one-turn ring 3 is provided on the inner or outer periphery of a sheet-shaped bobbin.
[0034]
That is, in FIG. 6, a conductive one-turn ring 3 is wound around the lower end of the bobbin 4, and two reinforcing rings 15a and 15b made of metal or polymer are in contact with the upper end surface of the bobbin 4. The outer and inner diameters of the bobbin 4 are bonded in advance via an adhesive 16, and inner and outer peripheral reinforcing rings 15 a and 15 b are provided on the bottom surface of the flat portion 12 b of the connecting flat portion 12 as shown in FIG. It is joined and fixed.
[0035]
Further, in the above-described configuration, the electrodynamic inductive speaker has been described as a speaker driving system, but the present invention is also applied to an electrodynamic speaker in which a voice coil is wound around a normal bobbin as shown in FIG. Obviously you get.
[0036]
Further, another configuration of the present invention applied to the above-described electrodynamic speaker will be described with reference to FIGS. 7 to 9. 7 is a side view of a bobbin having a reinforcing ring used in the present invention, FIG. 8 is a perspective view showing another structure of the bobbin having a reinforcing ring used in the present invention, and FIG. 9 is FIG. FIG. 14 is a side sectional view showing another configuration similar to the D part of FIG.
[0037]
FIG. 7 shows the reinforcing ring 15 separated from the upper end surface of the bobbin 4 by a predetermined height H on the side opposite to the winding position of the voice coil 17 wound around the bobbin 4 used for a normal electrodynamic speaker as a drive system. It is joined to the outer diameter side of the bobbin 4 via an adhesive at a position.
[0038]
The reinforcing ring 15 is made of the same polymer film as the acoustic diaphragm 11 or a metal film such as titanium, the inner diameter of which is substantially equal to the outer diameter of the bobbin 4, and the ring width w is substantially equal to the width w _{1 of the} flat portion of the connection flat portion 12. In addition, the winding position of the reinforcing ring 15 is selected such that the height H between the upper edge of the reinforcing ring 15 and the upper end surface of the bobbin 4 is substantially equal to the rising height of the inner peripheral portion 12a of the connection flat portion 12. As shown in FIG. 7, the outer diameter portion indicated by the height H of the bobbin 4 is joined to the inner peripheral portion via the adhesive 16 as shown in FIG. 9A, and the ring width w portion of the reinforcing ring 15 is formed. The adhesive 16 is also applied to the connection flat portion 12 and joined to the bottom surface of the flat portion 12b.
[0039]
8 is obtained by joining and fixing the reinforcing ring 15 shown in FIG. 7 to the mounting position of the reinforcing ring 15 of the bobbin 4 using a tape such as a polymer film while winding it for one or two turns. . In this case, the bobbin 4 can also be easily joined to the flat portion 12b and the inner peripheral portion 12a via the adhesive 16 as shown in FIG.
[0040]
9 (B) and 9 (C) are the same as those shown in FIGS. 6 and 9 (A), in which the conductive one-turn ring 3 is inserted and fixed in the inner diameter of the bobbin 4, and the bobbin A coupling flat part 12 is formed by joining reinforcing rings 15a and 15b to the inner or outer diameter of the upper end surface of a bobbin 4 with an adhesive 16 respectively using a drive system in which a normal voice coil 17 is wound around 2 shows a case where the adhesive 16 is adhered and fixed to the bottom surface of the flat portion 12b.
[0041]
Hereinafter, the characteristic difference between the present invention and the conventional one will be described using the sound pressure-frequency characteristics of FIGS. 10 and 11.
[0042]
FIG. 10 shows the result of calculating the sound pressure-frequency characteristics of the electrodynamic induction speaker described with reference to FIG. 1 by using the finite element method. The width w of the junctional flat portion 12 of the acoustic diaphragm 5 with thickness w 'is 0.05mm conductive first bobbin 4 for turn coil to substantially 0.25 mm, the width _{w 1} of the reinforcing ring 15 w = Calculation is performed using w ₁ as the same material and the same thickness as the acoustic diaphragm 5. In FIG. 10, the vertical axis indicates sound pressure level (dB), and the horizontal axis indicates frequencies from 10 kHz to 100 kHz.
[0043]
According to the above-described sound pressure-frequency characteristics, a frequency characteristic of a substantially flat level is obtained from 10 kHz to 100 kHz. Is efficiently transmitted to the edge-shaped diaphragm 13 without causing phase inversion or the like.
[0044]
FIG. 11 shows the result of calculation of the sound pressure-frequency characteristic of the speaker described with reference to FIG. 14 by the finite element method. In this case, the thickness of the bobbin 122 is as small as 0.05 mm while the width of the connecting flat portion 132 is 0.25 mm. Above about 40 kHz, a sharp drop in sound pressure is observed. In this case, the driving force of the bobbin 122 cannot be sufficiently transmitted to the edge-shaped diaphragm 129 at a high frequency of 40 kHz or more because the strength of the connection flat portion 132 is insufficient. Conversion is not efficient.
[0045]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the speaker device of this invention, the reinforcing ring is joined from the connection flat part of a diaphragm which has the connection flat part which connects a dome-shaped diaphragm and an edge-shaped diaphragm to the strength from the lower side near a connection flat part. When the bonded voice bobbin or conductive one-turn ring is joined to the connection flat part or the connection flat part and its vicinity, the mechanical strength of the connection flat part is increased, unnecessary vibration is removed, and adhesive is applied. In this case, the voice bobbin, the conductive one-turn ring, and the electrodynamic loudspeaker device which can be easily produced, can efficiently perform the sound output conversion, and can be reproduced almost flat up to a high frequency of 100 kHz, and an electrodynamic speaker device can be obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a speaker device according to a first embodiment of the present invention.
FIG. 2 is an equivalent circuit diagram for explaining the operation of FIG.
FIG. 3 is a perspective view showing a cross section of a part of a speaker device according to a second embodiment of the present invention.
FIG. 4 is a perspective view for explaining a method of assembling a reinforcing ring according to the first embodiment used for the speaker device of the present invention.
FIG. 5 is an enlarged sectional view of a portion C in FIG. 3;
FIG. 6 is an enlarged sectional view of a part D in FIG. 1;
FIG. 7 is a side view of a voice bobbin with a reinforcing ring according to a second embodiment of the present invention.
FIG. 8 is a perspective view of a voice bobbin with a correction ring showing a third embodiment used for the speaker device of the present invention.
FIG. 9 is a side sectional view showing various forms of a method of joining a voice bobbin to a diaphragm similar to FIGS. 1 and 6;
FIG. 10 is a sound pressure-frequency characteristic curve of the speaker device of the present invention.
FIG. 11 is a sound pressure-frequency characteristic curve of a conventional speaker device.
FIG. 12 is a side sectional view of a conventional speaker device.
FIG. 13 is an enlarged side sectional view of a portion A in FIG. 12;
FIG. 14 is an enlarged side sectional view showing another configuration of the portion A in FIG. 12;
FIG. 15 is an enlarged side sectional view (I) showing still another configuration of the portion A in FIG. 12;
FIG. 16 is an enlarged side sectional view (II) showing still another configuration of the portion A in FIG. 13;
[Explanation of symbols]
1 speaker device, 2 primary coil for excitation, 3 conductive one-turn ring, 5 acoustic diaphragm, 11 dome-shaped diaphragm, 12 connection flat portion, 12a inner periphery Part, 12b {flat part, 13} edge-shaped diaphragm, 15, 15a, 15b, 15c {reinforcing ring, 16} adhesive, 17} voice coil

Claims

A dome-shaped diaphragm and a connecting flat portion connecting the edge-shaped diaphragm are integrally formed, and a ring member formed at one end of a coil bobbin for voice is joined to the connecting flat portion of the diaphragm. Coil bobbin.

A dome-shaped diaphragm and a connecting flat portion for connecting an edge-shaped diaphragm are integrally formed, and a ring member formed at one end of a conductive one-turn coil is joined to the connecting flat portion of the diaphragm. A conductive one-turn ring.

The coil bobbin according to claim 1, wherein the ring member formed on the coil bobbin is formed concentrically and is joined to one end of the coil bobbin.

3. The conductive one-turn ring according to claim 2, wherein the ring member formed on the conductive one-turn ring is formed concentrically and joined to one end of the conductive one-turn ring.

The coil bobbin according to claim 1, wherein the ring member formed at one end of the coil bobbin is a tape winding member formed so as to wind one or more tapes.

The conductive one-turn ring according to claim 2, wherein the ring member formed at one end of the conductive one-turn ring is a tape winding member formed so as to wind one or more turns of a tape.

The coil bobbin according to claim 3, wherein a width of the ring portion of the ring member is selected to be equal to or greater than a width of the connecting flat portion of the diaphragm.

The conductive one-turn ring according to claim 4, wherein the width of the ring portion of the ring member is selected to be equal to or greater than the width of the connection flat portion of the diaphragm.

A diaphragm in which a connection flat portion that connects the dome-shaped diaphragm and the edge-shaped diaphragm is integrally formed,
A coil bobbin or a conductive one-turn ring disposed in a magnetic gap for driving the diaphragm;
A ring member formed at one end of the coil bobbin or the conductive one-turn ring,
A speaker device wherein at least an upper surface of the ring member is joined to a bottom surface of the connection flat portion of the diaphragm.

One end of the coil bobbin or the conductive one-turn ring is joined to the inner peripheral edge of the dome-shaped diaphragm forming the flat portion of the diaphragm, and the upper surface of the ring member is joined to the bottom of the connection flat portion. The speaker device according to claim 9, wherein: