JP3893694B2

JP3893694B2 - Speaker

Info

Publication number: JP3893694B2
Application number: JP28809897A
Authority: JP
Inventors: 満裕長谷川; 和浩山本
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1996-10-30
Filing date: 1997-10-21
Publication date: 2007-03-14
Anticipated expiration: 2017-10-21
Also published as: JPH10191494A

Description

【０００１】
【発明の属する技術分野】
本発明は各種音響機器、特に映像音響機器に使用される細長構造のスピーカに関するものである。
【０００２】
【従来の技術】
映像音響機器に使用されるスピーカは陰極線管の両脇に取り付けられるため、従来から映像音響機器用には角型や楕円型等の細長構造のスピーカが用いられてきたが、陰極線管のワイド化に伴い、ますますスピーカの幅を狭くすることが求められると共に、画面の高画質化に対応した音声の高音質化が要求されてきている。
【０００３】
ここで、従来の細長型のスピーカについて、図１３（ａ）〜図１３（ｃ）により説明する。
【０００４】
図１３（ａ）は従来の細長構造のスピーカの平面図、図１３（ｂ）は同長径方向の側断面図、図１３（ｃ）は同短径方向の側断面図である。
【０００５】
同図によると、２３は空気振動を発生する細長形状の振動板であり、この振動板２３の外周部はエッジ３２を介してフレーム２４に保持されている。
【０００６】
この振動板２３の中間部にはボイスコイルボビン２５が固着され、このコイルボビン２５はダンパー２６を介してフレーム２４に振動自在に支持されている。
【０００７】
一方、上記フレーム２４の中央凹部にはヨーク２７、磁石２８、トッププレート２９からなる磁気回路３０が設けられ、この磁気回路３０の空隙部にボイスコイルボビン２５に巻回されたボイスコイル３１が保持され、ボイスコイル３１に流れる駆動電流によりボイスコイルボビン２５がピストン運動し、振動板２３が振動し、音波が放射されるものである。
【０００８】
【発明が解決しようとする課題】
しかしながら、上述のスピーカは、（１）細長の振動板２３の中央部を集中駆動する構造のため長径方向の半頂角が大きすぎて面剛性が弱くなり、かつ駆動力が長径方向に伝搬しにくくなり、長軸方向の分割共振が発生し易く、中高域では音圧周波数特性上にピークディップを生じ、音圧周波数特性の劣化を招いた。
【０００９】
（２）ダンパー２６は、フレーム２４の内部に収まるように構成するために、曲率半径、クランプ幅ともに小さくする必要があり、結果、振動系のスティフネスが大きくなって、最低共振周波数ｆ０が上昇し、低音域の再生が困難になるという課題を有するものであった。
【００１０】
本発明は上記従来の課題を解決するもので、細長構造でありながら分割共振が起こりにくく、かつ、平坦な周波数特性が得られ、最低共振周波数ｆ０を低く抑えて低音域の再生を可能とした音質の優れたスピーカを提供するものである。
【００１１】
【課題を解決するための手段】
上記課題を解決するために本発明のスピーカは、少なくとも中央に直線状の磁気空隙を有する磁気回路と、この磁気回路に装着されたフレームと、このフレームにエッジを介して外周が結合されるとともに、振動方向から見た平面形状が長径と短径を有する角形またはトラック形または長円形または楕円形のいずれかの形状の振動板と、この振動板の略長径軸上に設けられた振動板のスリットに挿入接合される板状の駆動力伝達部材と、前記磁気空隙にはめ込まれる前記板状の駆動力伝達部材に設けられたボイスコイルと、前記板状の駆動力伝達部材が挿入されるスリットが設けられるとともに、このスリットの両側においてこのスリットと平行にトラック形状のコルケーションが設けられたダンパーとで構成され、前記板状の駆動力伝達部材の前記振動板との接合部分と前記ボイスコイルとの間の位置で前記スリットにおいて前記板状の駆動力伝達部材と前記ダンパーを接合するとともに、前記ダンパーの外周をフレームに結合したものであり、短径側はもちろん、長径側においても駆動力伝達部材から振動板最外周部までの距離を短くでき、駆動力を十分に振動板に伝達できて素直な平坦な音圧周波数特性が実現するとともに、外周をフレームに結合するとともに、前記板状の駆動力伝達部材を前記ダンパーに設けたスリットに挿入接合することで前記ダンパーのクランプ径を幅広く確保して更に最低共振周波数ｆ０を低く抑えて低音域の再生を可能とするものである。
【００１２】
【発明の実施の形態】
本発明の請求項１に記載の発明は、少なくとも中央に直線状の磁気空隙を有する縦長形状の磁気回路と、この磁気回路に装着されたフレームと、このフレームにエッジを介して外周が結合されるとともに、振動方向から見た平面形状が長径と短径を有する角形またはトラック形または長円形または楕円形のいずれかの形状の振動板と、この振動板の略長径軸上に設けられた振動板のスリットに挿入接合される板状の駆動力伝達部材と、前記板状の駆動力伝達部材に設けられたボイスコイルと、前記磁気空隙にはめ込まれる前記板状の駆動力伝達部材に設けられたボイスコイルと、前記板状の駆動力伝達部材が挿入されるスリットが設けられるとともに、このスリットの両側においてこのスリットと平行にトラック形状のコルケーションが設けられたダンパーとで構成され、前記板状の駆動力伝達部材の前記振動板との接合部分と前記ボイスコイルとの間の位置で前記スリットにおいて前記板状の駆動力伝達部材と前記ダンパーを接合するとともに、前記ダンパーの外周をフレームに結合したものであり、短径側はもちろん、長径側においても駆動力伝達部材から振動板最外周部までの距離を短くでき、駆動力を十分に振動板に伝達できて素直な平坦な音圧周波数特性が実現するとともに、外周をフレームに結合するとともに、前記板状の駆動力伝達部材を前記ダンパーに設けたスリットに挿入接合することでダンパーのクランプ径を幅広く確保して更に最低共振周波数ｆ０を低く抑えて低音域の再生を可能とするものである。
【００１３】
本発明の請求項２に記載の発明は、少なくとも環状の磁気空隙を上面中央部に有する磁気回路と、この磁気回路を背面中央に装着したフレームと、このフレームにエッジを介して外周が結合されるとともに振動方向から見た平面形状が長径と短径を有する角形またはトラック形または長円形または楕円形のいずれかの形状の振動板と、この振動板の略長径軸上に設けられた振動板のスリットに挿入接合された板状の駆動力伝達部材と、前記振動板に設けられた透孔に接合されて直接的に駆動力を伝達するとともに切り込み部を設け、これに挿入固着された前記板状の駆動力伝達部材を介して前記振動板に駆動力を伝達する円筒状ボイスコイルボビンと、前記円筒状ボイスコイルボビンの下端部に巻回されたボイスコイル線輪と、前記板状の駆動力伝達部材及び前記円筒状ボイスコイルボビンに接合されたダンパーとで構成されるとともに、このダンパーに前記円筒状ボイスコイルボビンとの環状接合部と、この環状接合部の外側に長径軸方向以外に設けた切り欠き部と、前記板状の駆動力伝達部材が挿入固着されるスリットと、前記スリットの両側に前記スリットと平行な少なくとも一つ以上の凸又は凹を繰り返して形成される波形と、フレームに結合する外周接合部が形成されたものであり、円筒状ボイスコイルボビンと板状駆動力伝達部材の双方で振動板を駆動でき、振動板の短径側はもちろん、長径側においても駆動力伝達部材から振動板最外周部までの距離を短くでき、さらに中高音域再生はボイスコイルボビンで直接的に振動板を駆動でき、優れた中高音域再生が実現できるものであるとともに、板状の駆動力伝達部材及び円筒状ボイスコイルボビンに接合されるダンパーを、少なくとも前記円筒状ボイスコイルボビンとの環状接合部と、その外側に長径軸方向以外に設けた切り欠き部と、板状の駆動力伝達部材が挿入固着されるスリットと、両側に前記スリットと平行な少なくとも一つ以上の凸又は凹を繰り返して形成される波形と、フレームに結合する外周接合部とで形成することで、円筒状ボイスコイルボビンの中心保持性が改善でき磁気回路構成部品への接触による異常音発生の防止、あるいは高耐入力化が実現できるとともに、環状接合部と分離された平行な波形のみで幅広く形成できるためダンパーに十分な柔軟度が確保できて最低共振周波数ｆ０を低く抑えて、大振幅振動即ち低音域の再生の改善をも可能とするものである。
【００１４】
本発明の請求項３に記載の発明は、少なくとも環状の磁気空隙を上面中央部に有する磁気回路と、この磁気回路を背面中央に装着したフレームと、このフレームにエッジを介して外周が結合されるとともに振動方向から見た平面形状が長径と短径を有する角形またはトラック形または長円形または楕円形のいずれかの形状の振動板と、この振動板の略長径軸上に設けられたスリットに挿入接合された板状の駆動力伝達部材と、前記振動板に設けられた透孔に接合されて直接的に駆動力を伝達するとともに、前記板状の駆動力伝達部材を介して前記振動板に駆動力を伝達するように前記板状の駆動力伝達部材を挿入固着する切り込み部を設けた円筒状ボイスコイルボビンと、前記円筒状ボイスコイルボビンの下端部に巻回されたボイスコイル線輪と、外周が前記フレームに接合され、更に、前記板状の駆動力伝達部材及び前記円筒状ボイスコイルボビンに接合されたダンパーとで構成されるとともに、前記振動板の短径断面を長径方向に略Ｖ字形として折曲部を形成し、前記スリットをこの折曲部に直線状に設けたものであり、円筒状ボイスコイルボビンと板状駆動力伝達部材の双方で振動板を駆動でき、振動板の短径側はもちろん、長径側においても駆動力伝達部材から振動板最外周部までの距離を短くでき、さらに中高音域再生はボイスコイルボビンで直接的に振動板を駆動でき、優れた中高音域再生が実現できるものであるとともに、前記振動板にボイスコイルボビン接合のための透孔を設け、かつ、短径の断面が長径方向に略Ｖ字形として折曲部を設け、この折曲部に直線状のスリットを設けた構成とすることで、板状駆動力伝達部材および円筒状ボイスコイルボビン駆動が併用できる振動板形状を提供できるものであり、ボイスコイルボビンから直接駆動力を振動板に伝達するために高音域再生において優れた特性を実現できるものである。
【００１５】
本発明の請求項４に記載の発明は、請求項１に記載の振動板の短径断面が長径方向に略逆Ｖ字形とした折曲部を形成し、この折曲部に設けられたスリットに駆動力伝達部材を挿入結合したものであり、振動板の短径側はもちろん、長径側においても駆動力伝達部材から振動板最外周部までの距離を短くでき、従って半頂角を最適化できるためコーン紙振動板による形状効果による剛性の向上が図られ、駆動力を十分に振動板に伝達できるとともに、振動板形状が略逆Ｖ字形であるために指向特性が良好で、かつ素直な平坦な音圧周波数特性が実現できるものである。
【００１６】
本発明の請求項５に記載の発明は、請求項１から請求項３に記載のスピーカにおいて振動板は、短径の断面が長径方向に略Ｖ字形の折曲部を形成し、この折曲部に直線状のスリットを設け、振動板の断面形状において長径方向の中心部から長径方向の終端に至る程断面曲線の曲率を大きくして半頂角を徐々に大きく形成したものであり、振動板を形成するコーン紙面に平面部の形成を避けることができ、振動板の平面部の剛性強度の向上が図られ、平面部に発生する局部的共振による異常音の発生を防止できるものである。
【００１７】
本発明の請求項６に記載の発明は、請求項１から請求項３に記載のスピーカにおいて振動板は、短径の断面が長径方向に略Ｖ字形の折曲部を形成し、この折曲部を長径軸終端に至る程浅くすることにより、半頂角を徐々に大きくすることができ、振動板を形成するコーン紙面に捻れができて平面部の形成を避けることができ、振動板の平面部の剛性強度の向上が図られ、平面部に発生する局部的共振による異常音の発生を防止できるものである。
【００２１】
本発明の請求項７に記載の発明は、請求項２に記載のスピーカにおいてダンパーは、中心部に円筒状ボイスコイルボビンとの環状接合部と、長径軸方向に板状駆動力伝達部材が挿入固着される複数のスリットを設けた直線状接合部を設けるとともに、前記スリットを環状接合部から間隔を開けて形成したものであり、環状接合部が円周方向に切断されることがなく、ボイスコイルボビンを環状接合部に挿入してもダンパーが短径方向に開くことがなく作業性が改善できるとともに、中心保持性のさらなる向上が図れるものである。
【００２２】
以下、本発明のスピーカの一実施の形態について図１から図１２により説明する。
【００２３】
（実施の形態１）
図１は、本発明の一実施の形態のスピーカの構造図を示すものであり、図１（ａ）は上面図であり、図１（ｂ）は中央部のＡ−Ａ’における短径方向の断面正面図、図１（ｃ）は断面斜視図、図２は要部である駆動力伝達部材の斜視図である。
【００２４】
同図によると、１は振動方向から見た平面形状が長径と短径とを有する細長形のトラック状の振動板であり、２は上記振動板１の外周に内周が固着されたエッジであり、このエッジ２の外周はフレーム１１に接着固着されて保持されている。前記振動板１は短径の断面が長径軸終端近傍まで略Ｖ字形であり、略逆搭載型半円錐曲面に連なる形状であって、底部折り曲げ部に直線状のスリットを有し、前記直線状のスリットにおいて一枚の板状の駆動力伝達部材３と接合されている。この駆動力伝達部材３は、ガラス繊維複合ポリアミド樹脂シートやアルミなどの金属単板やあるいは、それら単板を表皮およびコア材にしたサンドイッチ構造体などの複合基板から形成されて一段と剛性を高める効果を有している。
【００２５】
また前記駆動力伝達部材３の駆動は、前記板状の駆動力伝達部材３の下端部の片面に薄くかつ矩形型リング状に巻回し形成され接合されたボイスコイル４と前記矩形型リング状に形成されたボイスコイル４の振動軸と直交する二箇所のボイスコイル部分のうち一箇所のボイスコイルと、これが挿入される直線状の磁気空隙５を有する磁気回路６によって行われる。
【００２６】
磁気回路６はトッププレート７とヨーク９とそれら部材によりサンドイッチされた直方体形状のマグネット８により構成されている。
【００２７】
また、１０はダンパーであり長径方向のセンターにスリットを有し駆動力伝達部材３が固着されボイスコイル４が前記磁気空隙５に摺接することなく振動可能なように懸垂され、磁気回路６の振動板側に配設されフレーム１１に接着固着されている。
【００２８】
また、短径方向は長径側終端まで前記駆動力伝達部材３が挿入されるスリットに平行にかつ終端から長径側は半同心円状のコルゲーションを有し、振幅時におけるボイスコイル４の中心保持を行っている。１２はダストキャップで振動板１に接着固着されている。
【００２９】
以上のように構成されたスピーカの動作について説明する。ボイスコイル４に駆動電流が印加されると磁気空隙５から力を受け、板状の駆動力伝達部材３がピストン運動し、振動板１の長径方向の全長近傍にわたり駆動力を伝達振動し音波が放射されるものである。
【００３０】
従って振動板１の短径側はもちろん、長径側においても駆動力伝達部材３から振動板最外周までの距離が短くでき、コーン紙の振動板１の場合、半頂角を最適化できるため振動板１の形状効果により剛性が図られ、駆動力を十分に振動板１に伝達できて素直な平坦な音圧周波数特性が実現でき、またダンパー１０のクランプ径が幅広く確保できるために最低共振周波数ｆ０を低く抑えて低音域の再生を可能とするものである。
【００３１】
また、矩形型リング状に形成されたボイスコイル４の振動軸と直交する二箇所のボイスコイル４の部分には、駆動力電流が互いに逆向きに流れるため低域信号が印加され振幅が大きくなった場合に逆向きの駆動力により振動板１を制動することができ、過大入力時においてボイスコイル４の底当たりやエッジの突っ張りにおける振動板１の破壊等の耐入力に対する信頼性を向上できる。
【００３２】
（実施の形態２）
本発明の実施の形態２を図３により説明する。なお、以降の実施の形態の説明にあたっては実施の形態１と同一部分は同一番号を付与し、説明を省略して説明する。
【００３３】
同図によると、実施の形態１との相違点は振動板の形状であり、振動板１は非軸対称形で、かつ、短径の断面が長径軸終端近傍まで略逆Ｖ字形としている。指向特性が良好で、かつ素直な平坦な音圧周波数特性が実現できるものであり、また、フレーム１１のスピーカ取り付け面から磁気回路６までの距離を短くでき薄型のスピーカを実現するものである。
【００３４】
（実施の形態３）
本発明の実施の形態３を図４により説明する。
【００３５】
同図によると、実施の形態１との相違点は矩形型リング状に形成されたボイスコイル４が板状の駆動力伝達部材３の下端部の両面にかつ同じ位置に電流が同一方向に流れるように２つのボイスコイル４を接合したものでボイスコイル４の有効線長を長くできスピーカの高能率化が図れる。
【００３６】
また、駆動力伝達部材３とボイスコイル４の異種材料の熱線膨張係数が異なると駆動電流による発熱によりバイメタルのごとく駆動力伝達部材３が湾曲する向きに応力が発生するが、両面にかつ同じ位置に接合するため駆動力伝達部材３が湾曲することなく振動するため、高耐入力化が図れる。
【００３７】
（実施の形態４）
本発明の実施の形態４を図５により説明する。
【００３８】
同図によると、実施の形態１との相違点は駆動力源の構成、すなわち磁気回路１５の構成とボイスコイル４の位置である。
【００３９】
駆動力源は板状の駆動力伝達部材３の中間部の片面に、薄くかつ矩形型リング状に巻回し形成され接合されたボイスコイル４と、前記矩形型リング状に形成され接合されたボイスコイル４の振動軸と直交する二箇所のボイスコイル部分が各々挿入される二箇所の直線状の磁気空隙１４を有した磁気回路１５とから構成することにより、二箇所の磁気空隙の磁束の方向が互いに反転するため、ボイスコイル４の磁気回路１５から受ける駆動力が各々同じ方向に働き大きな駆動力が得られるためスピーカの能率向上が図れる。また駆動力源の背面側に駆動力伝達部材３に固着して振動可能なように懸垂する第２のダンパー１６が磁気回路１５の底部に固着された第２のフレーム１７に接着固着されている。これにより大振幅における駆動力伝達部材３の変形やボイスコイル４の磁気空隙１４とのこすれ等に対する信頼性が向上できるものである。
【００４０】
（実施の形態５）
本発明の実施の形態５を図６により説明する。
【００４１】
同図によると、実施の形態４との相違点は矩形型リング状に形成されたボイスコイル４が板状の駆動力伝達部材３の下端部の両面にかつ同じ位置に電流が同一方向に流れるように２つのボイスコイル線輪を接合したもので前記矩形型リング状に形成され接合されたボイスコイル４の振動軸と直交する四箇所のボイスコイル部分が各々挿入される二箇所の直線状の磁気空隙１４より駆動力を受けるためよりスピーカの能率向上が図れる。
【００４２】
（実施の形態６）
本発明の実施の形態６を図７により説明する。図７は、本発明の実施の形態６のスピーカの構造を示すものであり、図７（ａ）は上面図、図７（ｂ）は略中央部のＡ−Ａ’における短径方向の断面正面図、図７（ｃ）は断面斜視図である。同図によると駆動力源に関し、フレーム１１の背面に配し、少なくとも一つの環状磁気空隙１８と二箇所のスリット２１を設けた円筒状ボイスコイルボビン１９の下端部に巻回され、前記磁気空隙１８中に懸垂されたボイスコイル２０と、前記円筒状ボイスコイルボビン１９の上端部に接合された板状の駆動力伝達部材３とから構成するものであり、環状磁気空隙１８を有する磁気回路の構成であっても、振動方向から見た平面形状が、長径と短径とを有する細長形の非軸対称形の振動板を板状の駆動力伝達部材を介して駆動できるため、駆動力を十分に振動板に伝達できて素直な平坦な音圧周波数特性が実現できるものである。
【００４３】
（実施の形態７）
本発明の実施の形態７を図８により説明する。図８は要部であるボイスコイルボビンと駆動力伝達部材との関係を示す分解斜視図である。
【００４４】
同図によると、実施の形態６との相違点はボイスコイル２０を下端部に巻回した円筒状ボイスコイルボビン１９の上端部に嵌合接合した第２の駆動力伝達部材２２を介して、前記第２の駆動力伝達部材２２の上端部に長径方向にスリット２１を設け、板状の駆動力伝達部材３ａと嵌合接合して振動板１を駆動するものであり、板状の駆動力伝達部材３ａとの接合面積を大きくすることにより駆動力の損失なく効率的に駆動力を伝達するものである。ボイスコイルボビン１９の座屈などがなくより信頼性を向上させることができるものである。
【００４５】
（実施の形態８）
本発明の実施の形態８を図９により説明する。図９は、本発明の実施の形態８のスピーカの構造図を示すものであり、図９（ａ）は一部振動板を取り外した平面図、図９（ｂ）は長径軸における側断面図、図９（ｃ）は短径軸におけるＡ−Ａ’の断面矢視図、図９（ｄ）はＢ−Ｂ’断面矢視図、図９（ｅ）はＣ−Ｃ’断面矢視図、図９（ｆ）は図９（ａ）の振動板を取り外した部分からさらに板状駆動力伝達部材を取り外した図でダンパーの部分平面図を示したものである。
【００４６】
同図によると、１０１は振動方向から見た平面形状が長径と短径とを有する長方形又は楕円形、矩形等の非軸対称形の振動板であり、１０２は上記振動板１０１の外周に内周が固着されたエッジであり、このエッジ１０２の外周はフレーム１０３に固着されて保持されている。
【００４７】
上記振動板１０１は短径の断面が長径軸終端近傍まで略Ｖ字形で、Ｂ−Ｂ’断面からＣ−Ｃ’断面に至る程振動板断面形状の曲率を大きくして半頂角を徐々に大きく（α＜β）なっており、略逆搭載型半円錐曲面に連なる形状であって、底部折り曲げ部１０４に直線状のスリット１０５を有し、前記直線状のスリット１０５において一枚の板状駆動力伝達部材１０６と接合されている。
【００４８】
また、円筒状ボイスコイルボビン１０７は前記振動板１０１に環状に接合されて直接的に駆動力を伝達するとともに切り込み部１０８に挿入固着された前記板状駆動力伝達部材１０６を介して前記振動板１０１に駆動力を伝達する構成になっている。前記円筒状ボイスコイルボビン１０７の下端部にはボイスコイル線輪１０９が巻回されている。
【００４９】
ダンパー１３０はフレーム１０３に接合される細長形状の外周接合部１３１と内部に円筒状ボイスコイルボビン１０７との環状接合部１３２及び板状駆動力伝達部材１０６との直線状接合部１３３にスリット１３３ａを有し、その間の波形形成部において、前記直線状接合部１３３と平行な少なくとも一つ以上の凸又は凹を繰り返して形成される波形１３４とそれに連なる半同心円状の凸又は凹を含む波形１３５に形成し、さらに前記円筒状ボイスコイルボビン１０７との環状接合部１３２の外周部に長径軸方向を除いて切り欠き部１３６を設けて構成している。
【００５０】
また、磁気回路１４０は前記円筒状ボイスコイル線輪１０９が接触することなく振動可能なように懸垂される環状の磁気空隙１４１を形成し前記フレーム１０３に接合されている。前記磁気回路１４０は防磁型磁気回路構成になっており、トッププレート１４２とヨーク１４３とそれら部材によりサンドイッチされたリング状のメインマグネット１４４と前記ヨーク１４３の背面に接合され逆着磁されたサブマグネット１４５とサブマグネットの背面と前記ヨーク１４３を接続して磁気シールドするヨークカバー１４６により構成されている。１５０はボイスコイルボビン上端面に接合されたダストキャップである。
【００５１】
以上のように構成されたスピーカの動作について説明する。ボイスコイルボビン１０７はボイスコイル線輪１０９に駆動電流が印加されると磁気空隙１４１から駆動力を受け、ボイスコイルボビン１０７は直接的に振動板１０１を駆動するとともに板状駆動力伝達部材１０６を介して振動板１０１を駆動するために、振動板１０１の長径軸終端近傍まで駆動力を伝達振動し音波が放出される。従って振動板１０１の短径側はもちろん、長径側においても駆動力伝達部材１０６から振動板最外周までの距離が短くでき駆動力を十分に振動板１０１に伝達でき、さらに半頂角をα＜βとして振動板１０１を形成する面が捻れているため振動板面の面剛性の向上が図られ振動板１０１の部分共振による異常音の発生を防止でき、素直な平坦な音圧周波数特性が実現できるとともに、ダンパー１３０のクランプ径が幅広く確保できるために最低共振周波数ｆ０を低く抑えて低音域の再生を可能とするものである。
【００５２】
（実施の形態９）
本発明の実施の形態９を図１０により説明する。なお、以降の実施の形態の説明にあたっては実施の形態８と同一部分は同一番号を付与し、説明を省略して説明する。
【００５３】
同図において、図１０（ａ）は一部振動板を取り外した平面図、図１０（ｂ）は長径軸における側断面図、図１０（ｃ）は短径軸におけるＡ−Ａ’の断面矢視図、図１０（ｄ）はＢ−Ｂ’断面矢視図、図１０（ｅ）はＣ−Ｃ’断面矢視図、図１０（ｆ）は図１０（ａ）の振動板を取り外した部分からさらに板状駆動力伝達部材を取り外した図でダンパーの部分平面図を示したものである。
【００５４】
同図によると、実施の形態８との相違点は振動板の形状、そして板状駆動力伝達部材及びダンパーの接合部形状と接合方法にある。１０１は振動板、１０６は板状駆動力伝達部材、１０６ａは板状駆動力伝達部材の凸部、Ｌ１の二点鎖線は振動板１０１と板状駆動力伝達部材１０６の接合線であり、上記振動板１０１はＢ−Ｂ’断面からＣ−Ｃ’断面に至る程振動板の全高が浅く形成されて半頂角が徐々に大きく（α＜β）なり、振動板１０１を形成する面が捻れ、振動板面の面剛性の向上が図られ振動板１０１の部分共振による異常音の発生を防止できるものである。
【００５５】
ダンパー１３０における実施の形態８との相違点は前記円筒状ボイスコイルボビン１０７との環状接合部１３２及び板状駆動力伝達部材１０６との直線状接合部１３３にスリット１３３ｂの形状と接合法にあり、前記板状駆動力伝達部材１０６の下端部に凸部１０６ａを形成して前記環状接合部１３２近傍での接合部をなくしたために前記環状接合部１３２は連続的な環状を形成することができ、さらに板状駆動力伝達部材の凸部１０６ａと直線状接合部１３３のスリット１３３ｂの接合を前記凸部１０６ａを挿入して接合する構成により、環状接合部が円周方向に切断されることがなく、ボイスコイルボビン１０７を環状接合部に挿入してもダンパー１３０が短径方向に開くことがなく作業性が改善できるとともに、ボイスコイルボビン１０７の中心保持性のさらなる向上が図れるものであり、素直な平坦な音圧周波数特性が実現できるとともに、円筒状ボイスコイル駆動でありながらダンパー１３０のクランプ径が幅広く確保できるために最低共振周波数ｆ０を低く抑えて低音域の再生を可能とするものである。
【００５６】
（実施の形態１０）
本発明の実施の形態１０を図１１により説明する。尚実施の形態６または実施の形態９と同一部分は同一番号を付与し、説明を省略して説明する。
【００５７】
同図において、図１１（ａ）は一部振動板を取り外した平面図、図１１（ｂ）は長径軸における側断面図、図１１（ｃ）は短径軸におけるＡ−Ａ’断面矢視図、図１１（ｄ）はＢ−Ｂ’断面矢視図を示したものである。
【００５８】
同図によると、実施の形態６との相違点はダンパーが円筒状ボイスコイルボビン及び板状の駆動力伝達部材の双方を支持している点と振動板の面剛性向上を図っている点であり、１０１は振動板、１０２はエッジ、１０３はフレームで上記振動板１０１は短径の断面が長径軸終端近傍まで略Ｖ字形で、Ａ−Ａ’断面からＢ−Ｂ’断面に至る程振動板の全高が浅く形成されていて半頂角が徐々に大きくなり、長軸側で略逆搭載型半円錐曲面に連なる形状であって、底部折り曲げ部１０４に直線状のスリット１０５を有し、前記直線状のスリット１０５において一枚の板状駆動力伝達部材１０６と接合されている。
【００５９】
また、１０７は円筒状ボイスコイルボビンで切り込み部１０８に前記板状駆動力伝達部材１０６が挿入固着され、そして振動板１０１にはダストキャップ１５０ａが接合されている構成により、振動板１０１を形成する面が捻れ、振動板面の面剛性の向上が図られ振動板の部分共振による異常音の発生を防止できるものであり、さらにダンパーは、中心部に連続形成される円筒状ボイスコイルボビン１０７との環状接合部と長径軸方向に板状駆動力伝達部材１０６の双方を懸垂支持するために、中心保持性のさらなる向上が図れるものであり、素直な平坦な音圧周波数特性が実現できるとともに、ダンパー１３０のクランプ径が幅広く確保できるために最低共振周波数ｆ０を低く抑えて低音域の再生を可能とするものである。尚本実施の形態においてダストキャップを接合しているがこれはなくても技術的内容が変わるものではない。
【００６０】
（実施の形態１１）
本発明の実施の形態１１を図１２により説明する。尚実施の形態９と同一部分は同一番号を付与し、説明を省略して説明する。同図において、図１２（ａ）は一部振動板を取り外した平面図、図１２（ｂ）は長径軸における側断面図、図１２（ｃ）は短径軸におけるＡ−Ａ’の断面矢視図、図１２（ｄ）はＢ−Ｂ’断面矢視図を示したものである。
【００６１】
同図によると、実施の形態９との相違点は駆動力源である環状の磁気空隙を有する磁気回路及び環状のボイスコイルボビンが２個長軸径方向に間隔を置いて設けた点である。１０１ａは二つの円形の透孔を有する振動板、３０ａ，３０ｂは環状の磁気空隙を有する磁気回路、１０７ａ，１０７ｂは円筒状ボイスコイルボビンであり、前記円筒状ボイスコイルボビン１０７ａ，１０７ｂの切り込み部１０８ａ，１０８ｂに前記板状駆動力伝達部材１０６が挿入固着されているとともに、両円筒状ボイスコイルボビン１０７ａ，１０７ｂおよび駆動力伝達部材１０６を介して振動板１０１ａを駆動する構成により、さらなる中高音域再生の向上が図れるものである。
【００６２】
なお、上記各実施の形態においてはスピーカの細長形のトラック形状のものとして説明したが、矩形型形状のものであれば長円形や、楕円形のスピーカでも同様の効果を有するものであり、本発明の技術的範疇であることは勿論である。
【００６３】
また、本発明によって駆動力伝達部材を板状のものとして扱えるので、従来のボイスコイルボビンを使用したものでは振動板の周辺との距離に大きなバラツキを有していたものを、バラツキを抑制できて従来のコーン形スピーカ以外でも素直な平坦な周波数特性のスピーカを得ることができ、多彩な形状のスピーカをも提供可能とするものである。
【００６４】
【発明の効果】
以上のように本発明のスピーカは、振動板に結合されるとともに磁気回路の磁気空隙にはめ込まれるボイスコイル部を有する板状の駆動力伝達部材を用いたことによって、振動板の周辺との距離のバラツキを抑制して素直な平坦な音圧周波数特性のスピーカを得ることができ、多彩な形状のスピーカをも提供可能とするものである。
【図面の簡単な説明】
【図１】（ａ）本発明のスピーカの一実施の形態の上面図
（ｂ）同短径方向の側断面図
（ｃ）同断面斜視図
【図２】同要部である駆動力伝達部材の斜視図
【図３】同実施の形態２の側断面図
【図４】同実施の形態３の側断面図
【図５】同実施の形態４の側断面図
【図６】同実施の形態５の側断面図
【図７】（ａ）同実施の形態６の上面図
（ｂ）同短径方向の側断面図
（ｃ）同断面斜視図
【図８】同実施の形態７におけるボイスコイルボビンと駆動力伝達部材の分解斜視図
【図９】（ａ）同実施の形態８の一部振動板を取り外した上面図
（ｂ）同長径方向の側断面図
（ｃ）同短径方向のＡ−Ａ’断面矢視図
（ｄ）同Ｂ−Ｂ’断面矢視図
（ｅ）同Ｃ−Ｃ’断面矢視図
（ｆ）板状駆動力伝達部材までを取り外した上面図
【図１０】（ａ）同実施の形態９の一部振動板を取り外した上面図
（ｂ）同長径方向の側断面図
（ｃ）同短径方向のＡ−Ａ’断面矢視図
（ｄ）同Ｂ−Ｂ’断面矢視図
（ｅ）同Ｃ−Ｃ’断面矢視図
（ｆ）板状駆動力伝達部材までを取り外した上面図
【図１１】（ａ）同実施の形態１０の一部振動板を取り外した上面図
（ｂ）同長径方向の側断面図
（ｃ）同短径方向のＡ−Ａ’断面矢視図
（ｄ）同Ｂ−Ｂ’断面矢視図
【図１２】（ａ）同実施の形態１１の一部振動板を取り外した上面図
（ｂ）同長径方向の側断面図
（ｃ）同短径方向のＡ−Ａ’断面矢視図
（ｄ）同Ｂ−Ｂ’断面矢視図
【図１３】（ａ）従来のスピーカの上面図
（ｂ）同長径方向の断面図
（ｃ）同短径方向の断面図
【符号の説明】
１，１０１，１０１ａ振動板
２，１０２エッジ
３，３ａ駆動力伝達部材
４ボイスコイル
５直線状の磁気空隙
６磁気回路
７トッププレート
８マグネット
９ヨーク
１０ダンパー
１１，１０３フレーム
１２ダストキャップ
１４直線状の磁気空隙
１５磁気回路
１６第２のダンパー
１７第２のフレーム
１８，１４１環状磁気空隙
１９，１０７，１０７ａ，１０７ｂ円筒状ボイスコイルボビン
２０ボイスコイル
２１，１３３ａ，１３３ｂスリット
２２第２の駆動力伝達部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker having an elongated structure used for various types of audio equipment, particularly video audio equipment.
[0002]
[Prior art]
Speakers used in audiovisual equipment are mounted on both sides of the cathode ray tube, and so long and narrow speakers such as rectangular and elliptical have been used for audiovisual equipment. As a result, it is required to further reduce the width of the speaker, and there is a demand for higher sound quality corresponding to higher image quality on the screen.
[0003]
Here, a conventional elongated speaker will be described with reference to FIGS. 13 (a) to 13 (c).
[0004]
FIG. 13A is a plan view of a conventional elongated speaker, FIG. 13B is a side sectional view in the same major axis direction, and FIG. 13C is a side sectional view in the same minor axis direction.
[0005]
According to the figure, reference numeral 23 denotes an elongated diaphragm that generates air vibration, and the outer peripheral portion of the diaphragm 23 is held by a frame 24 via an edge 32.
[0006]
A voice coil bobbin 25 is fixed to an intermediate portion of the vibration plate 23, and the coil bobbin 25 is supported by a frame 24 through a damper 26 so as to freely vibrate.
[0007]
On the other hand, a magnetic circuit 30 comprising a yoke 27, a magnet 28 and a top plate 29 is provided in the central recess of the frame 24, and a voice coil 31 wound around the voice coil bobbin 25 is held in the gap of the magnetic circuit 30. The voice coil bobbin 25 is moved in a piston motion by the drive current flowing through the voice coil 31, the diaphragm 23 vibrates, and a sound wave is emitted.
[0008]
[Problems to be solved by the invention]
However, the above-mentioned speaker (1) has a structure in which the central portion of the elongated diaphragm 23 is driven in a concentrated manner, so that the semi-vertical angle in the major axis direction is too large, the surface rigidity becomes weak, and the driving force propagates in the major axis direction. It becomes difficult to cause division resonance in the major axis direction, and a peak dip occurs in the sound pressure frequency characteristic in the middle and high range, resulting in deterioration of the sound pressure frequency characteristic.
[0009]
(2) Since the damper 26 is configured to be accommodated in the frame 24, it is necessary to reduce both the radius of curvature and the clamp width. As a result, the stiffness of the vibration system increases and the minimum resonance frequency f0 increases. Therefore, there is a problem that it is difficult to reproduce the low frequency range.
[0010]
The present invention solves the above-mentioned conventional problems, and although it has an elongated structure, it is difficult to cause split resonance, and a flat frequency characteristic is obtained, and the lowest resonance frequency f0 can be suppressed to be low, enabling reproduction of a low sound range. The present invention provides a speaker with excellent sound quality.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the speaker of the present invention has at least Straight in the center A magnetic circuit having a magnetic gap, a frame attached to the magnetic circuit, and a frame Through the edge As the perimeter is joined , The planar shape seen from the vibration direction has a major axis and a minor axis. Either square or track or oval or oval Inserted and joined to the diaphragm and a slit of the diaphragm provided on the substantially major axis of the diaphragm A plate-like driving force transmission member; Fits in magnetic gap Provided on the plate-like driving force transmission member Voice carp And the above A slit into which the plate-like driving force transmission member is inserted And a damper provided with a track-shaped corrugation parallel to the slit on both sides of the slit, and a joint portion of the plate-like driving force transmission member with the diaphragm, the voice coil, The plate-like driving force transmission member and the damper are joined in the slit at a position between and the outer periphery of the damper is joined to the frame The distance from the driving force transmission member to the outermost periphery of the diaphragm can be shortened not only on the short diameter side but also on the long diameter side, and the driving force can be sufficiently transmitted to the diaphragm so that the flat and flat sound pressure frequency characteristics Is realized, By joining the outer periphery to the frame and inserting and joining the plate-like driving force transmission member to the slit provided in the damper A wide clamp diameter of the damper is secured, and the lowest resonance frequency f0 is kept low to enable reproduction in the low sound range.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is at least Straight in the center With magnetic air gap Vertically long The magnetic circuit, the frame attached to the magnetic circuit, and the frame Through the edge As the perimeter is joined , The planar shape seen from the vibration direction has a major axis and a minor axis. Either square or track or oval or oval Inserted and joined to the diaphragm and a slit of the diaphragm provided on the substantially major axis of the diaphragm A plate-like driving force transmission member and the plate-like driving force transmission member Voice carp And , Above Fits in magnetic gap Provided on the plate-like driving force transmission member Voice carp And the above A slit into which the plate-like driving force transmission member is inserted And a damper provided with a track-shaped corrugation parallel to the slit on both sides of the slit, and a joint portion of the plate-like driving force transmission member with the diaphragm, the voice coil, The plate-like driving force transmission member and the damper are joined in the slit at a position between and the outer periphery of the damper is joined to the frame The distance from the driving force transmission member to the outermost periphery of the diaphragm can be shortened not only on the short diameter side but also on the long diameter side, and the driving force can be sufficiently transmitted to the diaphragm so that the flat and flat sound pressure frequency characteristics Is realized, By joining the outer periphery to the frame and inserting and joining the plate-like driving force transmission member to the slit provided in the damper A wide clamp diameter of the damper is ensured, and the lowest resonance frequency f0 is kept low to enable reproduction in the low sound range.
[0013]
The invention according to claim 2 of the present invention has at least an annular magnetic air gap. In the top center Magnetic circuit having the magnetic circuit Was mounted in the center of the back Frame and this frame Through the edge The outer shape is combined and the planar shape viewed from the vibration direction has a major axis and a minor axis. Either square or track or oval or oval A diaphragm, a plate-like driving force transmission member inserted and joined to a slit of the diaphragm provided on a substantially long axis of the diaphragm, and directly joined to a through hole provided in the diaphragm A cylindrical voice coil bobbin that transmits driving force to the diaphragm via the plate-like driving force transmission member that is inserted and fixed to the notch, and a lower end of the cylindrical voice coil bobbin. And a damper that is joined to the plate-like driving force transmission member and the cylindrical voice coil bobbin. In The cylindrical voice coil bobbin; Ring of Long axis direction outside the ring-shaped joint and the annular joint other than A notch provided, a slit into which the plate-like driving force transmission member is inserted and fixed, and a waveform formed by repeatedly forming at least one convex or concave parallel to the slit on both sides of the slit; Peripheral joint joined to the frame But Formation Was The diaphragm can be driven by both the cylindrical voice coil bobbin and the plate-like driving force transmission member, and the distance from the driving force transmission member to the outermost periphery of the diaphragm not only on the short diameter side but also on the long diameter side of the diaphragm In addition, the mid-high range reproduction can directly drive the diaphragm with the voice coil bobbin, which can realize excellent mid-high range reproduction, and is joined to the plate-like driving force transmission member and the cylindrical voice coil bobbin And at least the cylindrical voice coil bobbin of Annular joint and long axis direction outside other than The cutout portion provided, the slit into which the plate-like driving force transmission member is inserted and fixed, the waveform formed by repeating at least one convex or concave parallel to the slit on both sides, and the frame are coupled The center joint of the cylindrical voice coil bobbin can be improved by forming it with the outer peripheral joint, preventing abnormal noise from coming into contact with the magnetic circuit components, or realizing high input resistance, and separated from the annular joint. Since it can be formed widely only by the parallel waveform, it is possible to secure a sufficient flexibility in the damper, to suppress the minimum resonance frequency f0, and to improve the reproduction of large amplitude vibration, that is, low sound range.
[0014]
The invention according to claim 3 of the present invention has at least an annular magnetic air gap. In the top center Magnetic circuit having the magnetic circuit Was mounted in the center of the back Frame and this frame Through the edge The outer shape is combined and the planar shape viewed from the vibration direction has a major axis and a minor axis. Either square or track or oval or oval On the diaphragm and the major axis of this diaphragm Insert into the provided slit While being joined to the joined plate-like driving force transmitting member and the through hole provided in the diaphragm, the driving force is directly transmitted. , A driving force is transmitted to the diaphragm via the plate-like driving force transmitting member. The plate-like driving force transmission member is inserted and fixed so as to have a notch A cylindrical voice coil bobbin, and a voice coil wire wound around the lower end of the cylindrical voice coil bobbin; The outer periphery is joined to the frame, and the damper is joined to the plate-like driving force transmission member and the cylindrical voice coil bobbin. And the diaphragm of Short diameter cross section In the major axis direction Abbreviated V shape As the bent part is formed , This slit Linear at the bend What was provided in The diaphragm can be driven by both the cylindrical voice coil bobbin and the plate-like driving force transmission member, and the distance from the driving force transmission member to the outermost periphery of the diaphragm can be increased not only on the short diameter side but also on the long diameter side of the vibration plate. The medium and high frequency range reproduction can be shortened, and the diaphragm can be directly driven by a voice coil bobbin, so that excellent medium and high range reproduction can be realized. In For voice coil bobbin bonding Provide a through hole And the short diameter cross section is the long diameter In the direction Abbreviated V shape As this bent section is provided A straight slit at the bent part Provided Configure By It can provide a diaphragm shape that can be used in combination with a plate-like driving force transmission member and a cylindrical voice coil bobbin drive, and can transmit excellent driving force directly from the voice coil bobbin to the diaphragm, realizing excellent characteristics in high-frequency reproduction. Is.
[0015]
The invention according to claim 4 of the present invention is such that the short-diameter section of the diaphragm according to claim 1 has a long diameter. In the direction Approximately inverted V shape Forming a bent part , this Driving force transmission member in slit provided in the bent part The Insertion join did As a result, the distance from the drive force transmission member to the outermost periphery of the diaphragm can be shortened not only on the short diameter side but also on the long diameter side of the diaphragm, so that the half apex angle can be optimized. As a result, the drive force can be sufficiently transmitted to the diaphragm, and since the diaphragm shape is substantially inverted V-shaped, the directivity is good and the flat and flat sound pressure frequency characteristic can be realized. Is.
[0016]
According to a fifth aspect of the present invention, in the speaker according to any one of the first to third aspects, the diaphragm has a short diameter cross section having a long diameter. In the direction Abbreviated V shape This forms the bent part of this A straight slit at the bent part Establishment The major axis in the cross-sectional shape of the diaphragm Direction Long diameter from center Direction Increasing the curvature of the cross section curve toward the end and gradually increasing the half apex angle And Can avoid the formation of a flat part on the cone paper surface forming the diaphragm, can improve the rigidity strength of the flat part of the diaphragm, and can prevent the generation of abnormal noise due to local resonance generated in the flat part It is.
[0017]
According to a sixth aspect of the present invention, in the speaker according to any one of the first to third aspects, the diaphragm has a short diameter cross section having a long diameter. In the direction Abbreviated V shape This forms the bent part of this By making the bent part as shallow as possible to the end of the major axis, the half apex angle can be gradually increased, the cone paper surface forming the diaphragm can be twisted, and the formation of the flat part can be avoided. The rigidity of the flat portion of the plate is improved, and abnormal noise due to local resonance occurring in the flat portion can be prevented.
[0021]
According to a seventh aspect of the present invention, in the speaker according to the second aspect, the damper includes an annular joint portion with a cylindrical voice coil bobbin at the center and a plate-like driving force transmission member in the major axis direction. Inserted Fixed plural Straight joint with slit And providing The slit is spaced from the annular joint. Formed, The annular joint is not cut in the circumferential direction, and even if a voice coil bobbin is inserted into the annular joint, the damper does not open in the minor axis direction, improving workability and further improving the center retainability. It can be planned.
[0022]
Hereinafter, an embodiment of a speaker according to the present invention will be described with reference to FIGS.
[0023]
(Embodiment 1)
FIG. 1 is a structural diagram of a speaker according to an embodiment of the present invention, FIG. 1 (a) is a top view, and FIG. 1 (b) is a minor axis direction at AA ′ in the central portion. FIG. 1C is a cross-sectional perspective view, and FIG. 2 is a perspective view of a driving force transmitting member as a main part.
[0024]
According to the figure, reference numeral 1 denotes an elongated track-like diaphragm whose planar shape viewed from the vibration direction has a major axis and a minor axis. Reference numeral 2 denotes an edge whose inner periphery is fixed to the outer periphery of the diaphragm 1. There is an outer periphery of the edge 2 that is adhered and fixed to the frame 11. The diaphragm 1 is substantially V-shaped with a short-diameter section extending to the vicinity of the end of the long-axis axis, has a shape that continues to a substantially reverse-mounted semiconical curved surface, and has a straight slit at the bottom bent portion, The plate-like driving force transmission member 3 is joined to the slit. This driving force transmitting member 3 is formed from a composite substrate such as a glass fiber composite polyamide resin sheet, a single metal plate such as aluminum, or a sandwich structure using the single plate as a skin and a core material. have.
[0025]
Further, the driving force transmission member 3 is driven in the rectangular ring shape with the voice coil 4 which is thinly wound in a rectangular ring shape and joined to one surface of the lower end portion of the plate-like driving force transmission member 3. This is performed by a magnetic circuit 6 having one voice coil of two voice coil portions orthogonal to the vibration axis of the formed voice coil 4 and a linear magnetic gap 5 into which the voice coil is inserted.
[0026]
The magnetic circuit 6 includes a top plate 7, a yoke 9, and a rectangular parallelepiped magnet 8 sandwiched between these members.
[0027]
Reference numeral 10 denotes a damper having a slit at the center in the major axis direction, the driving force transmitting member 3 being fixed, and the voice coil 4 being suspended so as to be able to vibrate without sliding against the magnetic gap 5, thereby vibrating the magnetic circuit 6. It is disposed on the plate side and is adhered and fixed to the frame 11.
[0028]
Further, the minor axis direction is parallel to the slit into which the driving force transmission member 3 is inserted to the end of the major axis side, and has a semi-concentric corrugation from the end to the major axis side to hold the center of the voice coil 4 at the amplitude. ing. A dust cap 12 is adhered and fixed to the diaphragm 1.
[0029]
The operation of the speaker configured as above will be described. When a drive current is applied to the voice coil 4, a force is received from the magnetic gap 5, the plate-like drive force transmission member 3 moves in a piston motion, and the drive force is transmitted and vibrated over the entire length of the diaphragm 1 in the major axis direction. It is radiated.
[0030]
Therefore, the distance from the driving force transmission member 3 to the outermost periphery of the diaphragm can be shortened not only on the short diameter side of the diaphragm 1 but also on the long diameter side, and in the case of the diaphragm 1 made of cone paper, the half apex angle can be optimized. Rigidity is achieved by the shape effect of the plate 1, the driving force can be sufficiently transmitted to the diaphragm 1, and a flat and flat sound pressure frequency characteristic can be realized, and a wide clamp diameter of the damper 10 can be secured, so that the lowest resonance frequency The low frequency range can be reproduced by keeping f0 low.
[0031]
Further, since the driving force current flows in opposite directions to the two portions of the voice coil 4 that are orthogonal to the vibration axis of the voice coil 4 formed in a rectangular ring shape, a low-frequency signal is applied to increase the amplitude. In this case, the diaphragm 1 can be braked by the reverse driving force, and the reliability against input resistance such as the bottom contact of the voice coil 4 or the breakage of the diaphragm 1 due to edge stretching at the time of excessive input can be improved.
[0032]
(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. In the following description of the embodiment, the same parts as those in the first embodiment will be given the same reference numerals and description thereof will be omitted.
[0033]
According to the figure, the difference from the first embodiment is the shape of the diaphragm. The diaphragm 1 is non-axisymmetric, and the cross section of the short diameter is substantially inverted V-shaped to the vicinity of the end of the long axis. The directional characteristics are good and an obedient flat sound pressure frequency characteristic can be realized, and the distance from the speaker mounting surface of the frame 11 to the magnetic circuit 6 can be shortened to realize a thin speaker.
[0034]
(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIG.
[0035]
According to the figure, the difference from the first embodiment is that the voice coil 4 formed in a rectangular ring shape has a current flowing in the same direction on both surfaces of the lower end portion of the plate-like driving force transmitting member 3 at the same position. Thus, by joining the two voice coils 4, the effective line length of the voice coil 4 can be increased and the efficiency of the speaker can be improved.
[0036]
Also, if the thermal expansion coefficients of different materials of the driving force transmission member 3 and the voice coil 4 are different, stress is generated in the direction in which the driving force transmission member 3 bends like bimetal due to heat generated by the driving current. Since the driving force transmission member 3 vibrates without being curved because it is joined to the joint, high input resistance can be achieved.
[0037]
(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIG.
[0038]
According to the figure, the difference from the first embodiment is the configuration of the driving force source, that is, the configuration of the magnetic circuit 15 and the position of the voice coil 4.
[0039]
The driving force source is a voice coil 4 that is thinly wound in a rectangular ring shape and joined to one surface of an intermediate portion of a plate-like driving force transmission member 3 and a voice that is formed and joined in the rectangular ring shape. The magnetic circuit 15 having two linear magnetic gaps 14 into which two voice coil portions orthogonal to the vibration axis of the coil 4 are inserted, respectively, so that the direction of the magnetic flux in the two magnetic gaps Since the driving force received from the magnetic circuit 15 of the voice coil 4 works in the same direction and a large driving force is obtained, the efficiency of the speaker can be improved. A second damper 16 that is fixed to the driving force transmission member 3 and suspended so as to vibrate is adhered and fixed to the second frame 17 fixed to the bottom of the magnetic circuit 15 on the back side of the driving force source. . Thereby, the reliability with respect to the deformation | transformation of the driving force transmission member 3 in a large amplitude, the rubbing with the magnetic space | gap 14 of the voice coil 4, etc. can be improved.
[0040]
(Embodiment 5)
Embodiment 5 of the present invention will be described with reference to FIG.
[0041]
According to the figure, the difference from the fourth embodiment is that the voice coil 4 formed in a rectangular ring shape has a current flowing in the same direction on both surfaces of the lower end portion of the plate-like driving force transmission member 3 at the same position. In this way, two voice coil wires are joined and formed into the rectangular ring shape, and the four voice coil portions perpendicular to the vibration axis of the joined voice coil 4 are respectively inserted into two linear shapes. Since the driving force is received from the magnetic gap 14, the efficiency of the speaker can be further improved.
[0042]
(Embodiment 6)
A sixth embodiment of the present invention will be described with reference to FIG. 7A and 7B show the structure of the speaker according to the sixth embodiment of the present invention. FIG. 7A is a top view, and FIG. 7B is a cross-section in the minor axis direction at AA ′ at a substantially central portion. A front view and FIG.7 (c) are cross-sectional perspective views. According to the figure, the driving force source is wound around the lower end portion of a cylindrical voice coil bobbin 19 provided on the back surface of the frame 11 and provided with at least one annular magnetic gap 18 and two slits 21. A voice coil 20 suspended in the inside and a plate-like driving force transmission member 3 joined to the upper end portion of the cylindrical voice coil bobbin 19, and having a configuration of a magnetic circuit having an annular magnetic gap 18. Even in such a case, since the planar shape viewed from the vibration direction can drive an elongated non-axisymmetric diaphragm having a major axis and a minor axis via a plate-shaped driving force transmission member, the driving force is sufficiently increased. It can be transmitted to the diaphragm and can realize a flat and flat sound pressure frequency characteristic.
[0043]
(Embodiment 7)
A seventh embodiment of the present invention will be described with reference to FIG. FIG. 8 is an exploded perspective view showing the relationship between the voice coil bobbin, which is a main part, and the driving force transmission member.
[0044]
According to the figure, the difference from the sixth embodiment is that the second driving force transmission member 22 fitted and joined to the upper end portion of the cylindrical voice coil bobbin 19 in which the voice coil 20 is wound around the lower end portion is used. A slit 21 is provided in the major axis direction at the upper end of the second driving force transmission member 22 and is fitted and joined to the plate-like driving force transmission member 3a to drive the diaphragm 1. The plate-like driving force transmission By increasing the joining area with the member 3a, the driving force is efficiently transmitted without loss of the driving force. There is no buckling of the voice coil bobbin 19 and the reliability can be further improved.
[0045]
(Embodiment 8)
An eighth embodiment of the present invention will be described with reference to FIG. FIG. 9 shows a structural diagram of the loudspeaker according to Embodiment 8 of the present invention. FIG. 9 (a) is a plan view with a part of the diaphragm removed, and FIG. 9 (b) is a side sectional view of the major axis. 9 (c) is a cross-sectional view taken along the line AA ′ on the minor axis, FIG. 9 (d) is a cross-sectional view taken along the line BB ′, and FIG. 9 (e) is a cross-sectional view taken along the line CC ′. FIG. 9F is a partial plan view of the damper in which the plate-like driving force transmission member is further removed from the part from which the diaphragm in FIG. 9A is removed.
[0046]
According to the figure, reference numeral 101 denotes a non-axisymmetrical diaphragm having a long shape and a short diameter as viewed in the vibration direction, such as a rectangle, an ellipse, or a rectangle, and 102 is an inner periphery of the diaphragm 101. The edge is a fixed edge, and the outer periphery of the edge 102 is fixed to and held by the frame 103.
[0047]
The diaphragm 101 has a substantially V-shaped short cross section near the end of the long axis, and gradually increases the curvature of the cross section of the diaphragm from the BB ′ cross section to the CC ′ cross section to gradually increase the half apex angle. It is large (α <β), has a shape that is continuous with a substantially reverse-mounted semiconical curved surface, and has a straight slit 105 in the bottom bent portion 104, and a single plate-like shape in the straight slit 105. The driving force transmission member 106 is joined.
[0048]
Further, the cylindrical voice coil bobbin 107 is joined to the diaphragm 101 in an annular shape so as to directly transmit the driving force and to the diaphragm 101 via the plate-like driving force transmitting member 106 inserted and fixed to the notch 108. It is the structure which transmits a driving force to. A voice coil wire 109 is wound around the lower end of the cylindrical voice coil bobbin 107.
[0049]
The damper 130 has an elongated outer peripheral joint 131 joined to the frame 103, an annular joint 132 of the cylindrical voice coil bobbin 107 inside, and a linear joint 133 of the plate-like driving force transmission member 106 with a slit 133 a. In the meantime, in the corrugation forming section, the corrugation 134 is formed by repeating at least one convex or concave parallel to the linear joint 133 and the corrugated 135 including a semi-concentric convex or concave continuous therewith. Further, a cutout portion 136 is provided on the outer peripheral portion of the annular joint portion 132 with the cylindrical voice coil bobbin 107 except for the major axis direction.
[0050]
Further, the magnetic circuit 140 forms an annular magnetic gap 141 that is suspended so that the cylindrical voice coil wire 109 can vibrate without coming into contact therewith, and is joined to the frame 103. The magnetic circuit 140 has a magnetic-shielding magnetic circuit configuration, and a top magnet 142, a yoke 143, a ring-shaped main magnet 144 sandwiched between these members, and a sub-magnet joined to the back of the yoke 143 and reversely magnetized. 145, a back surface of the submagnet, and a yoke cover 146 that connects the yoke 143 to magnetically shield it. A dust cap 150 is joined to the upper end surface of the voice coil bobbin.
[0051]
The operation of the speaker configured as above will be described. The voice coil bobbin 107 receives a driving force from the magnetic gap 141 when a driving current is applied to the voice coil wire 109, and the voice coil bobbin 107 directly drives the diaphragm 101 and via the plate-like driving force transmission member 106. In order to drive the diaphragm 101, the driving force is transmitted and vibrated to the vicinity of the end of the major axis of the diaphragm 101 to emit sound waves. Therefore, the distance from the driving force transmitting member 106 to the outermost periphery of the diaphragm can be shortened not only on the short diameter side of the diaphragm 101 but also on the long diameter side, and the driving force can be sufficiently transmitted to the diaphragm 101. Since the surface on which the diaphragm 101 is formed is twisted as β, the surface rigidity of the diaphragm surface is improved, and abnormal sound due to partial resonance of the diaphragm 101 can be prevented, and a straight and flat sound pressure frequency characteristic is realized. In addition, since a wide clamp diameter of the damper 130 can be ensured, the lowest resonance frequency f0 can be kept low to enable reproduction in the low sound range.
[0052]
(Embodiment 9)
A ninth embodiment of the present invention will be described with reference to FIG. In the following description of the embodiment, the same parts as those in the eighth embodiment will be given the same reference numerals, and description thereof will be omitted.
[0053]
10A is a plan view with a part of the diaphragm removed, FIG. 10B is a side sectional view of the major axis, and FIG. 10C is an AA ′ sectional arrow of the minor axis. FIG. 10 (d) is a cross-sectional view taken along the line BB ′, FIG. 10 (e) is a cross-sectional view taken along the line CC ′, and FIG. 10 (f) is a diagram where the diaphragm of FIG. 10 (a) is removed. FIG. 5 is a partial plan view of a damper in a view in which a plate-like driving force transmission member is further removed from the portion.
[0054]
According to the figure, the difference from the eighth embodiment is the shape of the diaphragm, and the shape and method of joining the plate-like driving force transmission member and the damper. 101 is a vibration plate, 106 is a plate-like driving force transmission member, 106a is a convex portion of the plate-like driving force transmission member, and a two-dot chain line L1 is a joint line between the vibration plate 101 and the plate-like driving force transmission member 106. The diaphragm 101 is formed such that the overall height of the diaphragm becomes shallower from the BB ′ section to the CC ′ section, the half apex angle gradually increases (α <β), and the surface forming the diaphragm 101 is twisted. The surface rigidity of the diaphragm surface is improved, and abnormal noise due to partial resonance of the diaphragm 101 can be prevented.
[0055]
The difference between the damper 130 and the eighth embodiment is in the shape and joining method of the slit 133b in the annular joint 132 with the cylindrical voice coil bobbin 107 and the linear joint 133 with the plate-like driving force transmission member 106. Since the convex portion 106a is formed at the lower end portion of the plate-like driving force transmitting member 106 and the joint portion in the vicinity of the annular joint portion 132 is eliminated, the annular joint portion 132 can form a continuous ring, Further, the structure in which the convex portion 106a of the plate-like driving force transmitting member and the slit 133b of the linear joint portion 133 are joined by inserting the convex portion 106a so that the annular joint portion is not cut in the circumferential direction. Even when the voice coil bobbin 107 is inserted into the annular joint, the damper 130 does not open in the minor diameter direction, and the workability can be improved. 7 can further improve the center retaining property, and can realize a straight and flat sound pressure frequency characteristic, and can secure a wide clamp diameter of the damper 130 while being driven by a cylindrical voice coil. The low frequency range can be reproduced while suppressing the low.
[0056]
(Embodiment 10)
A tenth embodiment of the present invention will be described with reference to FIG. In addition, the same part as Embodiment 6 or Embodiment 9 is provided with the same number, and explanation is omitted.
[0057]
11A is a plan view with a part of the diaphragm removed, FIG. 11B is a side sectional view of the major axis, and FIG. 11C is an AA ′ sectional view of the minor axis. FIG. 11 (d) shows a cross-sectional view taken along the line BB ′.
[0058]
According to the figure, the difference from the sixth embodiment is that the damper supports both the cylindrical voice coil bobbin and the plate-like driving force transmission member, and the surface rigidity of the diaphragm is improved. , 101 is a diaphragm, 102 is an edge, 103 is a frame, and the diaphragm 101 has a substantially V-shaped section with a short diameter extending to the vicinity of the terminal end of the major axis, and the diaphragm increases from the AA ′ section to the BB ′ section. The half height is gradually increased, the half apex angle is gradually increased, the shape is continuous with a substantially reverse-mounted semiconical curved surface on the long axis side, and the bottom bent portion 104 has a linear slit 105, The straight slit 105 is joined to a single plate-like driving force transmission member 106.
[0059]
Reference numeral 107 denotes a cylindrical voice coil bobbin, on which the plate-like driving force transmission member 106 is inserted and fixed in the cut portion 108, and a dust cap 150a is joined to the vibration plate 101. The surface rigidity of the diaphragm surface is improved and abnormal noise due to the partial resonance of the diaphragm can be prevented, and the damper is annular with a cylindrical voice coil bobbin 107 formed continuously in the center. Since both the joint and the plate-like driving force transmission member 106 are suspended and supported in the major axis direction, the center retainability can be further improved, and a straight and flat sound pressure frequency characteristic can be realized and the damper 130 can be realized. Therefore, the minimum resonance frequency f0 can be kept low to enable reproduction in the low sound range. Although the dust cap is joined in the present embodiment, the technical content does not change even if it is not present.
[0060]
(Embodiment 11)
An eleventh embodiment of the present invention will be described with reference to FIG. The same parts as those of the ninth embodiment are given the same numbers, and the description thereof will be omitted. 12 (a) is a plan view with a part of the diaphragm removed, FIG. 12 (b) is a side sectional view on the major axis, and FIG. 12 (c) is an AA ′ sectional arrow on the minor axis. FIG. 12D is a view taken along the line BB ′.
[0061]
According to the figure, the difference from the ninth embodiment is that two magnetic circuits having an annular magnetic gap as a driving force source and two annular voice coil bobbins are provided at intervals in the major axis radial direction. 101a is a diaphragm having two circular through holes, 30a and 30b are magnetic circuits having an annular magnetic gap, 107a and 107b are cylindrical voice coil bobbins, and the cut portions 108a and 107b of the cylindrical voice coil bobbins 107a and 107b are provided. The plate-like driving force transmission member 106 is inserted and fixed to 108b, and the diaphragm 101a is driven through both the cylindrical voice coil bobbins 107a and 107b and the driving force transmission member 106, thereby further reproducing the mid-high range reproduction. It can be improved.
[0062]
In each of the above embodiments, the speaker has been described as having an elongated track shape. However, if the speaker has a rectangular shape, an elliptical or elliptical speaker has the same effect. Of course, it is a technical category of the invention.
[0063]
In addition, since the driving force transmission member can be handled as a plate-like member according to the present invention, a conventional voice coil bobbin that has a large variation in the distance from the periphery of the diaphragm can suppress the variation. In addition to the conventional cone-shaped speaker, it is possible to obtain a speaker having a flat and flat frequency characteristic, and to provide a speaker having various shapes.
[0064]
【The invention's effect】
As described above, the speaker according to the present invention uses a plate-like driving force transmission member that has a voice coil portion that is coupled to the diaphragm and fitted in the magnetic gap of the magnetic circuit, so that the distance from the periphery of the diaphragm Accordingly, it is possible to obtain a speaker having a flat and flat sound pressure frequency characteristic by suppressing the variation of the above, and to provide a speaker having various shapes.
[Brief description of the drawings]
FIG. 1A is a top view of an embodiment of a speaker of the present invention.
(B) Side sectional view in the same minor axis direction
(C) Perspective sectional view
FIG. 2 is a perspective view of a driving force transmission member that is the main part of the same.
FIG. 3 is a side sectional view of the second embodiment.
FIG. 4 is a side sectional view of the third embodiment.
FIG. 5 is a side sectional view of the fourth embodiment.
FIG. 6 is a side sectional view of the fifth embodiment.
7A is a top view of the sixth embodiment. FIG.
(B) Side sectional view in the same minor axis direction
(C) Perspective sectional view
FIG. 8 is an exploded perspective view of a voice coil bobbin and a driving force transmission member according to the seventh embodiment.
FIG. 9A is a top view with the partial diaphragm of the eighth embodiment removed.
(B) Side sectional view in the same major axis direction
(C) AA ′ cross-sectional view in the same minor axis direction
(D) BB 'cross-sectional arrow view
(E) CC 'cross-sectional arrow view
(F) Top view with the plate-like driving force transmission member removed
FIG. 10A is a top view with the partial diaphragm of the ninth embodiment removed.
(B) Side sectional view in the same major axis direction
(C) AA ′ cross-sectional view in the same minor axis direction
(D) BB 'cross-sectional arrow view
(E) CC 'cross-sectional arrow view
(F) Top view with the plate-like driving force transmission member removed
11A is a top view of the tenth embodiment with a partial diaphragm removed. FIG.
(B) Side sectional view in the same major axis direction
(C) AA ′ cross-sectional view in the same minor axis direction
(D) BB 'cross-sectional arrow view
12 (a) is a top view with the partial vibration plate of Embodiment 11 removed. FIG.
(B) Side sectional view in the same major axis direction
(C) AA ′ cross-sectional view in the same minor axis direction
(D) BB 'cross-sectional arrow view
13A is a top view of a conventional speaker. FIG.
(B) Cross section in the same major axis direction
(C) Cross section in the same minor axis direction
[Explanation of symbols]
1,101,101a Diaphragm
2,102 edges
3, 3a Driving force transmission member
4 Voice coil
5 Linear magnetic gap
6 Magnetic circuit
7 Top plate
8 Magnet
9 York
10 Damper
11,103 frames
12 Dust cap
14 Linear magnetic gap
15 Magnetic circuit
16 Second damper
17 Second frame
18,141 annular magnetic gap
19, 107, 107a, 107b Cylindrical voice coil bobbin
20 Voice coil
21, 133a, 133b Slit
22 Second driving force transmission member

Claims

A vertically long magnetic circuit having a linear magnetic gap at least in the center, a frame attached to the magnetic circuit, and an outer periphery coupled to the frame via an edge, and a planar shape viewed from the vibration direction has a long diameter And a plate-like drive that is inserted and joined to a diaphragm of a rectangular or track shape having a short diameter, an elliptical shape, or an elliptical shape, and a diaphragm provided on a substantially long axis of the vibration plate. a force transmitting member, and a voice coil Le provided on the plate-like driving force transmitting member which is fitted into the magnetic gap, with a slit is provided in which the plate-like driving force transmitting member is inserted, on both sides of the slit The damper is provided with a track-shaped corrugation parallel to the slit, and the joint portion of the plate-like driving force transmission member with the diaphragm and the bolt With joining the damper and the plate-like driving force transmitting member in the slit at a location between the Sukoiru, speaker coupled to the outer periphery of the damper to the frame.

A magnetic circuit having at least an annular magnetic gap at the center of the upper surface, a frame having the magnetic circuit mounted at the center of the back surface, an outer periphery coupled to the frame via an edge, and a planar shape viewed from the vibration direction having a major axis A plate-like driving force inserted and joined to a diaphragm having a short diameter, a square shape, a track shape , an oval shape, or an oval shape, and a vibration plate provided on a substantially long axis of the vibration plate. a transmission member, as well as transmit directly driving force is joined to the through hole provided in the diaphragm, said to transmit a driving force to the vibrating plate via the plate-like driving force transmitting member a cylindrical voice coil bobbin having a cut portion for inserting fixing the plate-like driving force transmitting member, a voice coil wire loop wound around the lower end of the cylindrical voice coil bobbin, the plate-like driving force Den Together it is constituted by a member and a damper joined to the cylindrical voice coil bobbin, a ring-like junction between the cylindrical voice coil bobbin to the damper, is provided outside the annular junction in addition to the major axis direction cut A notch, a slit into which the plate-like driving force transmission member is inserted and fixed, a waveform formed by repeating at least one convex or concave parallel to the slit on both sides of the slit, and a frame Tei Ru speaker outer peripheral joint part is formed to be.

Diaphragm with either square or track shape or oval or oval shape

The speaker according to claim 1, wherein a bending portion is formed with a short-diameter cross section of the diaphragm having a substantially inverted V shape in the long-diameter direction, and a driving force transmission member is inserted and coupled to a slit provided in the bending portion.

Diaphragm, the minor cross-section to form a bent portion of the substantially V-shape in the major axis direction, provided the linear slit of the driving force transmitting member is inserted and coupled to the bent portion, from the center of the major axis direction The speaker according to any one of claims 1 to 3, wherein a curvature of the cross-sectional curve is increased toward a terminal end in a major axis direction so that a half apex angle is gradually increased.

The diaphragm has a straight slit in which a cross section of a short diameter forms a substantially V shape in the long diameter direction, and a driving force transmitting member is inserted and coupled to the bent section. The speaker according to any one of claims 1 to 3, wherein the overall height is made shallower toward the end in the major axis direction, and the half apex angle is gradually increased.

Damper has an annular junction between the cylindrical voice coil bobbin, a linear joint provided with a plurality of slits major axis direction in the plate-like driving force transmitting member is inserted fixed, the slit from the annular joint portion The speaker according to claim 2, which is provided at an interval.