JP3882312B2

JP3882312B2 - Speaker damper and speaker using the same

Info

Publication number: JP3882312B2
Application number: JP02288798A
Authority: JP
Inventors: 満裕長谷川; 和栄佐藤; 弘行武輪; 幹郎岩佐
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1998-02-04
Filing date: 1998-02-04
Publication date: 2007-02-14
Anticipated expiration: 2018-02-04
Also published as: JPH11225396A

Description

【０００１】
【発明の属する技術分野】
本発明は各種音響機器に使用されるスピーカを構成する支持部材としてのスピーカ用ダンパーおよびこれを用いたスピーカに関するものである。
【０００２】
【従来の技術】
最近のスピーカは小型高性能化のトレンドのもと、高品質ソースの普及とともに重低音再生が可能なものが求められている。小口径で重低音再生を可能にするためには、支持系の柔軟度を高くし、スピーカの振動板を大きく振動させ、体積速度を大きくする必要があり、微小な入力から大きな入力に至るまでボイスコイルに発生する駆動力に対して直線性がよい振幅を与える振動系支持部品、例えばスピーカ用ダンパーなどが望まれている。
【０００３】
まず、従来のスピーカについて説明すると、図９は従来のスピーカの断面図であり、同図によると、６はセンターポール６ａを有するボトムプレート６ｂとリング状マグネット６ｃとこのリング状マグネット６ｃ上に装着され上記センターポール６ａとの間で磁気ギャップ６ｄを形成する上プレート６ｅとで構成された磁気回路であり、７はこの磁気回路６に装着されたフレームであり、８はこのフレーム７に外周がエッジ８ａを介して結合され、内周が上記磁気ギャップ６ｄにはめ込まれるボイスコイル９に結合された振動板である。１０は外周を上記フレーム７に結合し内周を上記ボイスコイル９に結合して上記ボイスコイル９を支持するスピーカ用ダンパーである。なお、ボイスコイル９はボビンにコイルを巻回して形成されている。
【０００４】
ここで、上記スピーカ用ダンパーについて、図６（ａ）、（ｂ）、図７、図８（ａ），（ｂ），（ｃ）により詳細に説明する。
【０００５】
図６（ａ）は従来のスピーカ用ダンパーの平面図、図６（ｂ）は同半断面図である。
【０００６】
図６によると、１はボイスコイルボビンが挿入される透孔であり、２はこの透孔１の周囲に設けられたボイスコイルボビンを接合するための内周縁部である。３はスピーカ用ダンパーの外周縁部であり、スピーカのフレーム（図示せず）に接合される。４ａ，４ｂ，４ｃ，……４ｎは前記内周縁部２と外周縁部３の間で繰り返し形成され、円周方向に一周する凸凹の波型で、波型の形状変化で径方向の伸びを補償するというものである。材質は、一般的に比較的通気性が確保されている綿布などに熱硬化性のフェノール樹脂等を含浸させたものが主流であり、前記材料を加熱成形して形成している。
【０００７】
次にこの従来のスピーカ用ダンパーの変形メカニズムを図７、図８（ａ）〜（ｃ）にて説明する。図７は従来のスピーカ用ダンパーの半断面図であり、静止時の形状とボイスコイルが−Ｘ変位した時のスピーカ用ダンパーの形状を重ねて表わした図であり、図８（ａ），（ｂ），（ｃ）はスピーカ用ダンパーを等価な板バネ構成で表わした図である。スピーカ用ダンパーの波型４の形状が内周部から外周部に至るまで同一の場合、円周方向に単位幅の切片において同一の柔軟度を保持していると考えられるが、スピーカ用ダンパーは内径にボイスコイルボビン、外径がフレームに固着されているドーナツ状であるため、模式的に表現すれば内周部に比べ外周部は柔軟度を低く（例えば二倍の半径の所では約二分の一以下に）なっていると考えるのが妥当である。
【０００８】
即ち、図８（ａ）は波型部の内径が２ｂ、外径が２ａの従来のスピーカ用ダンパーに数ヵ所にスリット５を追加したスピーカ用ダンパーの平面図を表わす。図８（ｂ）は図８（ａ）のスリット５で４分割された１区画を薄い板で表現した図である。左端がボイスコイルボビンに接合される部分であり、その幅はπｂ／２、右端はフレームに接着される部分で、πａ／２の幅を有する固定端であり、長さはａ−ｂの台形形状に近似できる。図８（ｃ）は図８（ｂ）の幅πｂ／２からはみ出した部分を折り返して表現したもので、このスピーカ用ダンパーはある部分から２枚あるいは３枚に重なった重ね板バネを構成していることになる。
【０００９】
【発明が解決しようとする課題】
以上のように構成されたスピーカ用ダンパーは外周になるほど比例的に柔軟度が低く、すなわち硬くなることになり、振動が大きくなった場合に径方向単位長さ当たりの振動軸方向の変位が径方向の各部位に比例均等に分散されるのではなく、波型部の柔軟度の高低に対応して比較的柔軟度の高い内周部は径方向単位長さ当たりの振動軸方向の変位が大きく、柔軟度が低い外周部は径方向単位長さ当たりの振動軸方向の変位があまりとれない。
【００１０】
従って、従来のスピーカ用ダンパーは、ボイスコイル接合部が前後に振動しても、充分な力−変位特性の直線性が確保できないとともに、大きな変位を可能にできないという欠点があった。また、大きな振動振幅を得るためにスピーカ用ダンパーに波型を形成しているが、復元しうる繊維の収縮の範囲で直線性のよい振幅が得られず、最近の小口径のスピーカで重低音を出すために過大な入力を加えて振幅値を無理やり拡大しているために、内周部のみに振動振幅に耐え難い変化量が起きて結果的に内周部で破断するという課題を有するものであった。
【００１１】
本発明は上記課題を解決するもので、円周方向に分断され、多角形に配設された直線状の円筒あるいは半円筒状のロール部から構成し、ロール部の固定端近傍で開口率や厚さを変化させて柔軟度を低く設定することにより、ボイスコイルボビン接合部が振動軸方向に前後に振動した場合にロール部の曲率が変化して振動振幅するため大きな振幅値が得られ、そして比較的広い範囲の振動振幅の領域で上下対称性、ヒステリシスの観点から見て直線性の良い力−変化特性が得られ、振幅限界において振動振幅を抑制できるスピーカ用ダンパーを提供するものである。
【００１２】
【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用ダンパーは、ボイスコイルボビンが挿入固着される透孔を有する外形が多角形の内固定枠部と、内径側に内固定枠部の外形各辺と対向する平行な辺を有する外固定枠部と、前記対向する各辺を固定端とし、前記固定端から延出したロール部によって形成されるスピーカ用ダンパーであって、通常の振動振幅領域においてはロール部が形成する板バネの幅を等価的に狭く、あるいは厚みを薄くするなど変形部分の形状を等価設定して柔軟度を高くし、振動振幅の限界領域に至る近傍では板バネの幅を等価的に広く、あるいは厚みを厚くするなど変形部分の形状を徐々に変化させて柔軟度を低く設定して、通常の振動振幅領域では直線性の良い力−変位特性とし、かつ最低共振周波数を低く設定し、振動振幅が大きい領域になると徐々に低い柔軟度に変化して振動系を磁気回路などへの当たりによる異常音放射を防止できるスピーカ用ダンパーを提供できるものである。
【００１３】
【発明の実施の形態】
本発明の請求項１に記載の発明は、ボイスコイルボビンが挿入固着される透孔を有する外形が多角形の内固定枠部と、内径側に内固定枠部の外形各辺と対向する平行な辺を有する外固定枠部と、前記対向する各辺を固定端とし、前記固定端から延出したロール部によって形成されるスピーカ用ダンパーであって、ロール部の頂部近傍の開口率を大とし、ロール部の固定端の開口率をゼロ又は小にしてロール部の固定端近傍で徐々に変化する開口率を有する開口部を設けたことによりバネとして作用するロール部の幅が等価的に頂部近傍で狭く、固定端の近傍で徐々に幅を広くし、振動振幅が小さい領域では高い柔軟度のスピーカ用ダンパーとして作用し、直線性の良い力−変位特性を与え、振動振幅が大きい領域になると徐々に低い柔軟度に変化して振動系を磁気回路などへの当たりによる異常音放射を防止するものである。
【００１４】
本発明の請求項２に記載の発明は、ボイスコイルボビンが挿入固着される透孔を有する外形が多角形の内固定枠部と、内径側に内固定枠部の外形各辺と対向する平行な辺を有する外固定枠部と、前記対向する各辺を固定端とし、前記固定端から延出したロール部によって形成されるスピーカ用ダンパーであって、ロール部の頂部近傍の肉厚を薄く成し、ロール部の固定端の肉厚を厚くしてロール部の固定端近傍で徐々に変化する肉厚部を設けたことにより、振動振幅が小さい領域では高い柔軟度のスピーカ用ダンパーとして作用し、直線性の良い力−変位特性を与え、振動振幅が大きい領域になると徐々に低い柔軟度に変化して振動系を磁気回路などへの当たりによる異常音放射を防止でき、さらには一体樹脂成型が可能となるものである。
【００１５】
本発明の請求項３に記載の発明は、請求項１または２に記載のスピーカ用ダンパーであって偶数多角形で形成された内固定枠部と、前記内固定枠部及び外固定枠部の対向する各辺を固定端とし、前記固定端から延出したロール部が上側ロール部と下側ロール部を交互に形成した構成とすることにより、振動軸の正負の力−変位特性の対称性を更に改善できるものである。
【００１６】
本発明の請求項４に記載の発明は、ボイスコイルボビンが挿入固着される透孔を有する外形が多角形の内固定枠部と、内径側に内固定枠部の外形各辺と対向する平行な辺を有する外固定枠部と、前記対向する各辺を固定端とし延出した断面略円形の筒体が少なくとも一対以上形成され、上側のロール部の頂部及び下側のロール部の底部の各近傍にて開口率を大となし、ロール部の固定端の開口率をゼロ又は小にして、ロール部の固定端近傍で徐々に変化する開口率を有する開口部を設けたことにより、振動軸方向の対称性と、横ずれに対する抵抗力を向上し、中心保持性の改善を図るものである。
【００１７】
本発明の請求項５に記載の発明は、ボイスコイルボビンが挿入固着される透孔を有する外形が多角形の内固定枠部と、内径側に内固定枠部の外形各辺と対向する平行な辺を有する外固定枠部と、前記対向する各辺を固定端とし、前記固定端から延出した断面略円形の筒体が少なくとも一対以上形成されるスピーカ用ダンパーであって、上側のロール部の頂部及び下側のロール部の底部の各近傍の肉厚を薄くなし、ロール部の固定端の肉厚を厚くして、ロール部の固定端近傍で徐々に変化する肉厚部を設けたものであり、振動軸方向の対称性と、横ずれに対する抵抗力の向上を図り、中心保持性の改善を図り、一体樹脂成型を可能とするものである。
【００１８】
本発明の請求項６に記載の発明は、請求項１または３または４に記載のスピーカ用ダンパーのロール部の頂部近傍の開口率を大となし、ロール部の固定端の開口率をゼロ又は小になるべく予め設定した非磁性の金属箔板でロール部を挿入前に形成し、内固定枠部及び外固定枠部のそれぞれ対向する各辺を固定端として、双方の固定端を橋渡しするように前記ロール部をインサート成型したものであり、金属箔板のロール部を適宜入れ替えることにより、柔軟度あるいは力−変位特性の直線領域の範囲を選択でき、かつ良好なヒステリシスが得られるものである。
【００２０】
本発明の請求項７に記載の発明は、請求項１または３または４に記載のスピーカ用ダンパーのロール部の形成材質が非磁性のステンレス箔板、リン青銅箔板から構成することにより磁気回路近傍で吸引力の影響を受けず、耐疲労性に優れたスピーカ用ダンパーを提供できるものである。
【００２１】
本発明の請求項８に記載の発明は、請求項６に記載のスピーカ用ダンパーのロール部に機械的内部損失の大なるゴム、樹脂を表面コートしたことにより、高周波領域における固有共振の制動を有効に行えるものである。
【００２２】
本発明の請求項９に記載の発明は、請求項１，２，３，４，５または６に記載のスピーカ用ダンパーの内固定枠部の透孔の内壁のボイスコイルボビン接合部にフェノール樹脂含浸布で成型された接合部材をインサート成型したものであり、ボイスコイル接合時の挿入を容易にできるものである。
【００２３】
本発明の請求項１０に記載の発明は、請求項１，２，３，４，５または６に記載のスピーカ用ダンパーの一対の導電性金属箔を前記内固定枠部にインサート成型し、前記導電性金属箔の各一端をボイスコイルリード線の近傍に露出させ、他端を内固定枠部の角部に露出させた構成としたものであり、給電線を外部ターミナルに最短距離で引き出しでき、振動時にロール部に当たって異常音を出すなどの不都合な状態を回避するものである。
【００２４】
本発明の請求項１１に記載の発明は、請求項６に記載のスピーカ用ダンパーの金属箔板からなる一対の内側給電線を前記内固定枠部にインサート成型し、同様に一対の外側給電線を前記外固定枠部にインサート成型し、前記内側給電線の各一端をボイスコイルリード線の近傍に露出させ、各他端を内固定枠部のロール部の固定部にて導電性金属箔板から形成された対応するロール部に接合させ、前記外側給電線の各一端をターミナル接続部に露出させ、各他端を外固定枠部のロール部の固定部にて各ロール部に接合させた構成としたことにより、給電線が部品の中に保持され、またロール部が給電線を兼ねているため振動時に発生していた給電線にかかる異常音放射、給電線断線などの現象を抑制できるものである。
【００２５】
本発明の請求項１２に記載の発明は、請求項１１に記載のスピーカ用ダンパーの少なくとも一対のロール部を導電性金属箔板から形成し、各々に内側給電線、外側給電線を一体的に形成したものであり、部品点数、接合箇所の削減で、合理的な給電方法が実現できるものである。
【００２６】
本発明の請求項１３に記載の発明は、請求項１，２，３，４，５，６，７，８，９，１０，１１または１２に記載のスピーカ用ダンパーのうちのいずれか一つを用いてスピーカを構成するものであり、スピーカ用ダンパーの振幅の直線性が確保されて、小口径で重低音再生可能なスピーカが提供できるものである。
【００２７】
以下、本発明のスピーカ用ダンパーの一実施の形態について図１から図５により説明する。なお、スピーカの構成は従来技術と同様であるので説明を省略する。
【００２８】
（実施の形態１）
図１は、本発明の一実施の形態のスピーカ用ダンパーの斜視図を示すものであり、図２は図１のスピーカ用ダンパーのＡ−Ｏ−Ｂ部分断面図、図３は要部である半円筒ロール部を形成する金属箔板の展開図である。
【００２９】
同図によると、１１は本発明の一実施の形態のスピーカ用ダンパーであり、１２はボイスコイルのボビンが挿入固着される透孔１３を有し、外形は前記透孔１３に略外接する正方形で形成され、軽量化を図るためにリブ形状により構成されている内固定枠部であり、１４はスピーカのフレーム（図示せず）に固定される外固定枠部であり、内径側に前記内固定枠部１２の外形各辺と対向する平行な辺を有しており、前記内固定枠部１２の各辺を固定端１５（１５ａｉ，１５ｂｉ，１５ｃｉ，１５ｄｉ）とし、前記外固定枠部１４の各辺を固定端１６（１６ａｏ，１６ｂｏ，１６ｃｏ，１６ｄｏ）とし、前記固定端１５と固定端１６を橋渡しするようにインサート成型により形成された非磁性材料であるステンレス、リン青銅等の金属箔板からなるロール部１７（１７ａ，１７ｂ，１７ｃ，１７ｄ）によって構成されている。
【００３０】
この内少なくとも一対のロール部１７ａ，１７ｃは導電性金属箔板から形成され、さらに内側給電線１８ａ，１８ｃ及び外側給電線１９ａ，１９ｃを一体的に形成して前記内側給電線１８ａ，１８ｃは前記内固定枠部１２に保持されて前記透孔１３近傍に端部２０ａ，２０ｃを露出し、前記外側給電線１９ａ，１９ｃは前記外固定枠部１４に保持されてターミナル（図示せず）近傍に端部２１ａ，２１ｃを露出している。端部２０ａ，２０ｃにはボイスコイルリード線（図示せず）が電気的接続され、端部２１ａ，２１ｃはターミナルに電気的接続される。
【００３１】
さらに前記ロール部１７の頂部１７Ｔ近傍から中間部１７Ｍまでの範囲においてはエッチング、打抜きなどの処理工程により均等に開口して開口率を例えば７５％程度に大きく且つ等しく設定し、ロール部１７の固定端１７Ｂの開口率をゼロにして中間部１７Ｍからロール部１７の固定端１７Ｂ近傍までの範囲においては開口率を上述の７５％からゼロまで徐々に小さく変化する開口部が設けられている。また内固定枠部１２の透孔１３の内壁のボイスコイルのボビン接合部にフェノール樹脂含浸布で成型された接合部材２２がインサート成型されて構成されている。
【００３２】
以上のように構成されたスピーカ用ダンパーの動作について説明する。
ターミナルに入力が印加されると導電性金属箔板から形成された外側給電線１９ａ，１９ｃ、ロール部１７ａ，１７ｃ及び内側給電線１８ａ，１８ｃを介してボイスコイル（図示せず）に駆動電流が印加されて駆動力を受け、ボイスコイルボビンが挿入固着された内固定枠部１２が振動軸方向に振動する。この時金属箔板で形成されたロール部１７は板バネとして作用し、変形により駆動力と均衡をとりながら振動系を支持する。
【００３３】
ここでロール部１７の頂部１７Ｔ近傍から中間部１７Ｍまでの範囲においてはエッチング、打抜きなどの処理工程により均等に開口して開口率を大きく且つ等しく設定し、ロール部１７の固定端１７Ｂの開口率をゼロにして中間部１７Ｍからロール部１７の固定端１７Ｂ近傍までの範囲においては開口率を徐々に小さく変化する開口部にしているために、板バネの柔軟度を決定する板幅が等価的に頂部近傍で狭く、固定端１７Ｂ近傍で徐々に幅が広くなることにより、振動振幅が小さい領域では高い柔軟度のスピーカ用ダンパーとして作用し、かつ中間部の変形が柔軟度を決定する振動振幅領域に至るまでは直線性の良い力−変位特性を与え、振動振幅がさらに大きい領域になると徐々に低い柔軟度に変化して振動系の振動振幅を抑制し、振動系の磁気回路などへの当たりによる異常音放射を防止するものである。
【００３４】
また、給電線が部品の中に保持され、またロール部１７が給電線を兼ねているため振動時に給電線が他の部品に接触して発生していた異常音放射、給電線断線などの給電線自体に関わる不都合な現象を回避できるものである。
【００３５】
尚、上記実施の形態では半円筒状のロール部１７を全て凸型の形態で説明したが、偶数個配列される場合においてはロール部１７を交互に凸型と凹型を配設することにより、振動軸方向の中心保持性、力−変位特性の上下の対称性を改善することができる。更に平坦な金属箔板を変形させて挿入し、インサート成型した場合にはロール部１７に発生する応力がバランスした状態で振動軸方向の中心保持が設定されるために、微小振動振幅領域でも応答性がさらに良くなる。
【００３６】
また、ロール部１７にゴム、樹脂を表面コートすることにより、高周波領域における固有共振による振動を有効に制動できるものである。
【００３７】
（実施の形態２）
本発明の他の実施の形態を図４により説明する。図４はスピーカ用ダンパーの図２と同様のＡ−Ｏ−Ｂ部分断面図である。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。
【００３８】
同図によると、実施の形態１との相違点はロール部１７の構成であり、内固定枠部１２の各辺を固定端１５（１５ａｉ，１５ｂｉ，１５ｃｉ，１５ｄｉ）とし、外固定枠部１４の各辺を固定端１６（１６ａｏ，１６ｂｏ，１６ｃｏ，１６ｄｏ）とし、前記固定端１５と固定端１６から延出するようにインサート成型により形成されたステンレスやリン青銅等の金属箔板からなる断面略円形の筒体２３を少なくとも一対以上形成し、上側のロール部１７（１７ａｕ，１７ｂｕ，１７ｃｕ，１７ｄｕ）及び下側のロール部１７（１７ａｄ，１７ｂｄ，１７ｃｄ，１７ｄｄ）で構成したもので、それぞれのロール部１７の頂部（底部）で開口率を大とし、固定端近傍で小さくすることは実施の形態１と同様である。振動軸方向の対称性のさらなる改善と横ずれに対する抵抗力の向上により中心保持性の改善が図れるスピーカ用ダンパーを実現したものである。
【００３９】
（実施の形態３）
本発明の他の実施の形態を図５により説明する。図５はスピーカ用ダンパーの図２と同様のＡ−Ｏ−Ｂ部分断面図である。なお、実施の形態の説明にあたっては実施の形態１，２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。
【００４０】
同図によると、実施の形態１，２との相違点はロール部１７の構成と補助給電線にあり、内固定枠部１２の各辺を固定端１５（１５ａｉ，１５ｂｉ，１５ｃｉ，１５ｄｉ）とし、外固定枠部１４の各辺を固定端１６（１６ａｏ，１６ｂｏ，１６ｃｏ，１６ｄｏ）とし、前記固定端１５と固定端１６を橋渡しするように延出したロール部１７（１７ａ，１７ｂ，１７ｃ，１７ｄ）を射出成型により形成し、さらに前記ロール部１７の頂部１７Ｔ近傍から中間部１７Ｍまでの範囲においては肉厚を薄く且つ等しく設定し、ロール部１７の固定端１７Ｂの肉厚を厚くして中間部１７Ｍからロール部１７の固定端１７Ｂ近傍までの範囲においては徐々に厚く変化する肉厚部を設けたことにより、振動振幅が小さい領域では高い柔軟度のスピーカ用ダンパーとして作用し、直線性の良い力−変位特性を与え、振動振幅が大きい領域になると徐々に低い柔軟度に変化して振動系の磁気回路などへの当たりによる異常音放射を防止でき、さらには一体樹脂成型が可能となるものである。
【００４１】
また、一対の導電性金属箔２４（２４ａ，２４ｃ）を前記内固定枠部１２にインサート成型し、前記導電性金属箔２４の各一端２４をボイスコイルリード線の近傍に露出させ、他端２４ａｏを内固定枠部１２の角部に露出させた構成により、給電線を外部ターミナルに最短距離で引き出しでき、振動時にロール部１７に当たって異常音を出すなどの不都合なことが回避できる。
【００４２】
なお、上記実施の形態では半円筒状のロール部１７を全て凸型の形態で説明したが、偶数個配列される場合においてはロール部１７を交互に凸型と凹型を配設することにより、振動軸方向の中心保持性、力−変位特性の上下の対称性を改善することができる。また、実施の形態３で説明した樹脂成型の半円筒状のロール部１７を樹脂成型にて断面略円形の筒体を少なくとも一対以上形成してもよく、上側のロール部１７及び下側のロール部１７の形状効果により、振動軸方向の対称性のさらなる改善と横ずれに対する抵抗力の向上により中心保持性の改善が図れるスピーカ用ダンパーを実現するものである。
【００４３】
以上のように本発明のスピーカ用ダンパーは、円周方向に分断され、多角形に配設された直線状の円筒あるいは半円筒状のロール部から構成することにより、振動振幅が小さい領域では高い柔軟度のスピーカ用ダンパーとして作用し、スピーカの最低共振周波数を低く設定でき、重低音再生が可能な比較的小型のスピーカを実現することができ、さらに中間部の変形が柔軟度を決定する振動振幅領域に至るまでは直線性の良い力−変位特性が与えられ、かつロール部を上下対称に配置することによる振動軸方向の対称性のさらなる改善と横ずれに対する抵抗力の向上により中心保持性の改善が図れ、さらに金属箔板を形状保持してインサート成型した場合にはロール部に発生する応力がバランスした状態で振動軸方向の中心保持が設定されるために、微小振動振幅領域でも応答性がさらに良くなるのでパワーリニアリティの良好なスピーカを実現することができ、そして振動振幅がさらに大きい領域になると徐々に低い柔軟度に変化して振動系の振動振幅を抑制するので、振動系の磁気回路などへの当たりによる異常音放射を防止できるスピーカを提供できるものである。
【００４４】
【発明の効果】
以上のように本発明のスピーカ用ダンパーは、円周方向に分断され、多角形に配設された直線状の円筒あるいは半円筒状のロール部から構成することにより、ボイスコイルボビン接合部が振動軸方向に前後に振動した場合にロール部の曲率が変化して振動振幅するため大きな振幅値が得られ、そして比較的広い範囲の振動振幅の領域で上下対称性、ヒステリシスの観点から見ても直線性の良い力−変位特性が得られ、振幅限界において振動振幅を抑制できるスピーカ用ダンパーを提供するものである。
【図面の簡単な説明】
【図１】本発明のスピーカ用ダンパーの一実施の形態の斜視図
【図２】同図１のＡ−Ｏ−Ｂ部分断面図
【図３】同要部である金属箔板の展開図
【図４】同他の実施の形態のＡ−Ｏ−Ｂ部分断面図
【図５】同他の実施の形態のＡ−Ｏ−Ｂ部分断面図
【図６】（ａ）従来のスピーカ用ダンパーの平面図
（ｂ）同半断面図
【図７】同変形姿勢を重ね書きした変形図
【図８】（ａ）同スピーカ用ダンパーに数ヵ所にスリットを追加したスピーカ用ダンパーの平面図
（ｂ）スリットで分割された１区画を薄い板で表現した模式図
（ｃ）同図（ｂ）を重ね板バネ構成で表現した図
【図９】同スピーカの断面図
【符号の説明】
１１スピーカ用ダンパー
１２内固定枠部
１３透孔
１４外固定枠部
１５（１５ａｉ，１５ｂｉ，１５ｃｉ，１５ｄｉ）内固定枠部１２の固定端
１６（１６ａｏ，１６ｂｏ，１６ｃｏ，１６ｄｏ）外固定枠部１４の固定端
１７（１７ａ，１７ｂ，１７ｃ，１７ｄ）ロール部
１７Ｔロール部１７の頂部
１７Ｍロール部１７の中間部
１７Ｂロール部１７の固定端
１７（１７ａｕ，１７ｂｕ，１７ｃｕ，１７ｄｕ）上側のロール部
１７（１７ａｄ，１７ｂｄ，１７ｃｄ，１７ｄｄ）下側のロール部
１８ａ，１８ｃ内側給電線
１９ａ，１９ｃ外側給電線
２０ａ，２０ｃ内側給電線の端部
２１ａ，２１ｃ外側給電線の端部
２３断面略円形の筒体
２４ａ，２４ｃ導電性金属箔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker damper as a support member that constitutes a speaker used in various acoustic devices, and a speaker using the same.
[0002]
[Prior art]
Recent speakers are required to be capable of reproducing heavy bass with the spread of high-quality sources under the trend of small size and high performance. In order to enable reproduction of heavy bass with a small aperture, it is necessary to increase the flexibility of the support system, greatly vibrate the diaphragm of the speaker, and increase the volume velocity. From minute input to large input There is a demand for a vibration system support component that gives an amplitude having a good linearity to the driving force generated in the voice coil, such as a speaker damper.
[0003]
First, a conventional speaker will be described. FIG. 9 is a cross-sectional view of a conventional speaker. According to the figure, reference numeral 6 denotes a bottom plate 6b having a center pole 6a, a ring-shaped magnet 6c, and a ring-shaped magnet 6c. And a magnetic circuit composed of an upper plate 6e that forms a magnetic gap 6d with the center pole 6a. Reference numeral 7 denotes a frame attached to the magnetic circuit 6. Reference numeral 8 denotes an outer periphery of the frame 7. The diaphragm is coupled to the voice coil 9 which is coupled via the edge 8a and whose inner circumference is fitted into the magnetic gap 6d. A speaker damper 10 supports the voice coil 9 by coupling the outer periphery to the frame 7 and the inner periphery to the voice coil 9. The voice coil 9 is formed by winding a coil around a bobbin.
[0004]
The speaker damper will be described in detail with reference to FIGS. 6A, 6B, 7, and 8A, 8B, and 8C.
[0005]
FIG. 6A is a plan view of a conventional speaker damper, and FIG. 6B is a half sectional view thereof.
[0006]
According to FIG. 6, 1 is a through hole into which the voice coil bobbin is inserted, and 2 is an inner peripheral edge portion for joining the voice coil bobbin provided around the through hole 1. Reference numeral 3 denotes an outer peripheral edge portion of the speaker damper, which is joined to a speaker frame (not shown). 4a, 4b, 4c,..., 4n are repeatedly formed between the inner peripheral edge 2 and the outer peripheral edge 3, and are uneven corrugations that circulate in the circumferential direction. It is to compensate. The main material is generally a cotton cloth or the like that is relatively air permeable and impregnated with a thermosetting phenol resin or the like, and is formed by thermoforming the material.
[0007]
Next, the deformation mechanism of the conventional speaker damper will be described with reference to FIGS. 7 and 8A to 8C. FIG. 7 is a half cross-sectional view of a conventional speaker damper, and is a diagram in which the shape at rest and the shape of the speaker damper when the voice coil is displaced by -X are overlapped. (b) and (c) are diagrams showing speaker dampers with an equivalent leaf spring configuration. If the shape of the waveform 4 of the damper for the speaker is the same from the inner periphery to the outer periphery, it is considered that the same flexibility is maintained in the section of the unit width in the circumferential direction. Since it is a donut shape with a voice coil bobbin on the inner diameter and an outer diameter fixed to the frame, the outer peripheral part is less flexible than the inner peripheral part if expressed schematically (for example, about twice as much at a double radius) It is reasonable to think that
[0008]
8A is a plan view of a speaker damper in which slits 5 are added to several portions of a conventional speaker damper having an inner diameter of 2b and an outer diameter of 2a. FIG. 8B is a diagram in which one section divided into four by the slit 5 in FIG. 8A is expressed by a thin plate. The left end is the part that is joined to the voice coil bobbin, the width is πb / 2, the right end is the part that is bonded to the frame, the fixed end has a width of πa / 2, and the length is a trapezoidal shape of ab Can be approximated. FIG. 8 (c) is a representation of the portion protruding from the width πb / 2 of FIG. 8 (b) folded back. This speaker damper is composed of two or three overlapping plate springs from a certain portion. Will be.
[0009]
[Problems to be solved by the invention]
The loudspeaker damper configured as described above has a proportionally lower flexibility as it becomes the outer periphery, that is, it becomes harder, and when the vibration increases, the displacement in the vibration axis direction per radial unit length is the diameter. Rather than being distributed proportionally and evenly in each part of the direction, the inner peripheral part having a relatively high degree of flexibility corresponding to the degree of flexibility of the corrugated part has a displacement in the vibration axis direction per radial unit length. The outer peripheral portion having a large and low flexibility does not take much displacement in the vibration axis direction per unit length in the radial direction.
[0010]
Therefore, the conventional speaker damper has the disadvantages that even if the voice coil joint portion vibrates back and forth, sufficient linearity of force-displacement characteristics cannot be ensured and large displacement cannot be achieved. In addition, a wave shape is formed in the speaker damper to obtain a large vibration amplitude, but an amplitude with good linearity cannot be obtained within the range of shrinkage of the fiber that can be restored. Since the amplitude value is forcibly expanded by adding an excessive input to generate noise, there is a problem that a change amount that cannot withstand the vibration amplitude occurs only in the inner peripheral portion, resulting in breakage in the inner peripheral portion. there were.
[0011]
The present invention solves the above-mentioned problem, and is composed of a linear cylindrical or semi-cylindrical roll section that is divided in the circumferential direction and arranged in a polygonal shape. By changing the thickness and setting the flexibility low, when the voice coil bobbin joint vibrates back and forth in the vibration axis direction, the curvature of the roll part changes and the vibration amplitude is obtained, and a large amplitude value is obtained, and It is an object of the present invention to provide a loudspeaker damper capable of obtaining force-change characteristics with good linearity in terms of vertical symmetry and hysteresis in a relatively wide range of vibration amplitudes and suppressing vibration amplitude at the amplitude limit.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, the speaker damper according to the present invention has an inner fixed frame portion having a polygonal outer shape having a through hole into which a voice coil bobbin is inserted and fixed, and faces each outer shape of the inner fixed frame portion on the inner diameter side. A damper for a speaker formed by an outer fixed frame portion having parallel sides and a roll portion extending from the fixed end with the opposing sides as fixed ends, and is rolled in a normal vibration amplitude region. The width of the leaf spring formed by the part is equivalently narrowed, or the thickness of the deformed part is equivalently set, such as by reducing the thickness, to increase the flexibility, and the width of the leaf spring is equivalent in the vicinity of the limit region of vibration amplitude By changing the shape of the deformed part gradually, such as by increasing the thickness or increasing the thickness, the flexibility is set to be low, and in the normal vibration amplitude region, the force-displacement characteristics have good linearity, and the minimum resonance frequency is low. Set, Those capable of providing a damper for a loudspeaker when the dynamic amplitude is larger area gradually lower flexibility vibration system changes to be prevented abnormal noise radiation due to contact of the like magnetic circuit.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, the outer shape having a through hole into which the voice coil bobbin is inserted and fixed is a polygonal inner fixed frame portion, and parallel to the inner diameter side facing the outer sides of the inner fixed frame portion. A damper for a speaker formed by an outer fixed frame portion having sides and a roll portion extending from the fixed end with each opposing side as a fixed end, wherein the aperture ratio in the vicinity of the top of the roll portion is increased. The width of the roll part that acts as a spring is equivalent to the top by providing an opening having an opening ratio that gradually changes in the vicinity of the fixed end of the roll part with the opening ratio of the fixed end of the roll part being zero or small. Narrow in the vicinity, gradually widened in the vicinity of the fixed end, acts as a highly flexible speaker damper in a region where the vibration amplitude is small, gives a force-displacement characteristic with good linearity, and in a region where the vibration amplitude is large Gradually becoming less flexible It turned into and to prevent abnormal noise radiation due to contact of the like magnetic circuit vibration system.
[0014]
The invention according to claim 2 of the present invention is such that the outer shape having a through hole into which the voice coil bobbin is inserted and fixed is a polygonal inner fixed frame portion, and parallel to the inner diameter side facing the outer sides of the inner fixed frame portion. A damper for a speaker formed by an outer fixed frame portion having sides and a roll portion extending from the fixed end with each opposing side as a fixed end, wherein the thickness near the top of the roll portion is reduced. In addition, by increasing the thickness of the fixed end of the roll part and providing a thick part that gradually changes in the vicinity of the fixed end of the roll part, it acts as a highly flexible speaker damper in a region where the vibration amplitude is small. Gives good linearity force-displacement characteristics, and when the vibration amplitude is large, it gradually changes to low flexibility, preventing abnormal sound radiation due to the vibration system hitting the magnetic circuit, etc., and integrated resin molding Is possible.
[0015]
The invention according to claim 3 of the present invention is the speaker damper according to claim 1 or 2, wherein the inner fixed frame portion formed of an even-numbered polygon, and the inner fixed frame portion and the outer fixed frame portion. Symmetry of the positive and negative force-displacement characteristics of the vibration axis by making each side facing each other a fixed end, and the roll portion extending from the fixed end is formed by alternately forming the upper roll portion and the lower roll portion. Can be further improved.
[0016]
The invention according to claim 4 of the present invention is such that the outer shape having a through hole into which the voice coil bobbin is inserted and fixed is a polygonal inner fixed frame portion and parallel to the inner diameter side facing each outer side of the inner fixed frame portion. An outer fixed frame portion having sides and at least a pair of substantially circular cylinders extending with the opposing sides as fixed ends are formed, and each of the top portion of the upper roll portion and the bottom portion of the lower roll portion is formed. By making the aperture ratio large in the vicinity, making the aperture ratio of the fixed end of the roll part zero or small, and providing an opening having an opening ratio that gradually changes near the fixed end of the roll part, the vibration axis This improves the symmetry of direction and the resistance to lateral displacement, and improves the center retention.
[0017]
The invention according to claim 5 of the present invention is such that the outer shape having a through hole into which the voice coil bobbin is inserted and fixed is a polygonal inner fixed frame portion, and parallel to the inner diameter side facing the outer sides of the inner fixed frame portion. A speaker damper having an outer fixed frame portion having sides and at least a pair of substantially circular cylinders having a substantially circular cross section extending from the fixed ends, each of the opposing sides being fixed ends, and an upper roll portion The thickness of the vicinity of the bottom portion of the top and the bottom of the lower roll portion is reduced, the thickness of the fixed end of the roll portion is increased, and a thick portion that gradually changes in the vicinity of the fixed end of the roll portion is provided. It is intended to improve the symmetry in the vibration axis direction and the resistance to lateral displacement, improve the center retainability, and enable integral resin molding.
[0018]
The invention according to claim 6 of the present invention has a large aperture ratio in the vicinity of the top of the roll portion of the speaker damper according to claim 1, 3 or 4, and the aperture ratio of the fixed end of the roll portion is zero or Form the roll part before insertion with a nonmagnetic metal foil plate set in advance as small as possible, Each of the inner fixed frame part and the outer fixed frame part With each facing side as a fixed end, The roll part is placed so that both fixed ends are bridged. Insert formation Mold Therefore, by appropriately replacing the roll portion of the metal foil plate, the range of the linear region of flexibility or force-displacement characteristics can be selected, and good hysteresis can be obtained.
[0020]
Claims of the invention 7 According to the invention described in claim 1, the material for forming the roll part of the speaker damper according to claim 1, 3 or 4 is made of a non-magnetic stainless steel foil plate or phosphor bronze foil plate, so that the influence of the attractive force in the vicinity of the magnetic circuit is achieved. Therefore, it is possible to provide a damper for a speaker having excellent fatigue resistance.
[0021]
Claims of the invention 8 According to the invention described in claim 6, since the roll portion of the speaker damper according to claim 6 is coated with rubber or resin having a large mechanical internal loss, it is possible to effectively brake the natural resonance in the high frequency region. .
[0022]
Claims of the invention 9 The invention described in claim 1, wherein the speaker damper according to claim 1, 2, 3, 4, 5, or 6 is provided. The inner wall of the through hole of the inner fixed frame A joining member molded with a phenol resin-impregnated cloth is insert-molded at the voice coil bobbin joint, and insertion at the time of voice coil joining can be facilitated.
[0023]
Claims of the invention 10 The invention described in claim 1 insert-molds a pair of conductive metal foils of the damper for a speaker according to claim 1, 2, 3, 4, 5 or 6 into the inner fixed frame portion, and each of the conductive metal foils One end is exposed in the vicinity of the voice coil lead wire and the other end is exposed at the corner of the inner fixed frame part. The feed line can be pulled out to the external terminal at the shortest distance, and hits the roll part during vibration. It avoids an inconvenient state such as making an abnormal sound.
[0024]
Claims of the invention 11 The invention described in claim 6 A pair of inner power supply lines made of a metal foil plate of the damper for a speaker as described above are insert-molded in the inner fixed frame portion, and similarly, a pair of outer power supply lines are insert-molded in the outer fixed frame portion, Each one end is exposed in the vicinity of the voice coil lead wire, and each other end is joined to a corresponding roll part formed from a conductive metal foil plate at a fixing part of the roll part of the inner fixed frame part, The one end of each is exposed to the terminal connection part, and the other end is joined to each roll part at the fixing part of the roll part of the outer fixed frame part, so that the power supply line is held in the component, In addition, since the roll portion also serves as a power supply line, it is possible to suppress phenomena such as abnormal sound radiation and power supply line breakage that occurred on the power supply line during vibration.
[0025]
Claims of the invention 12 The invention described in claim 11 The at least one pair of roll parts of the damper for a speaker described in the above is formed from a conductive metal foil plate, and an inner feeding line and an outer feeding line are integrally formed on each of them. A rational power supply method can be realized.
[0026]
Claims of the invention 13 The invention described in claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 Or 12 A speaker is constructed using any one of the speaker dampers described in 1., and a speaker capable of reproducing a bass sound with a small diameter while ensuring the linearity of the amplitude of the speaker damper. It is.
[0027]
An embodiment of a speaker damper according to the present invention will be described below with reference to FIGS. In addition, since the structure of a speaker is the same as that of a prior art, description is abbreviate | omitted.
[0028]
(Embodiment 1)
FIG. 1 is a perspective view of a speaker damper according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the speaker damper of FIG. 1, and FIG. 3 is a main part thereof. It is an expanded view of the metal foil board which forms a semi-cylindrical roll part.
[0029]
According to the figure, 11 is a speaker damper according to an embodiment of the present invention, 12 has a through-hole 13 into which a bobbin of a voice coil is inserted and fixed, and the outer shape is a square that substantially circumscribes the through-hole 13. The inner fixed frame portion is formed by a rib shape to reduce weight, and 14 is an outer fixed frame portion fixed to a speaker frame (not shown). The outer fixed frame portion 14 has parallel sides opposite to the outer sides of the fixed frame portion 12, and the respective sides of the inner fixed frame portion 12 serve as fixed ends 15 (15ai, 15bi, 15ci, 15di). The metal foil such as stainless steel and phosphor bronze which is a nonmagnetic material formed by insert molding so that each side is fixed end 16 (16ao, 16bo, 16co, 16do) and bridges the fixed end 15 and the fixed end 16 From the board That the roll portion 17 (17a, 17b, 17c, 17d) is constituted by.
[0030]
Among these, at least a pair of roll parts 17a, 17c is formed of a conductive metal foil plate, and further, inner feeding lines 18a, 18c and outer feeding lines 19a, 19c are integrally formed so that the inner feeding lines 18a, 18c Ends 20a and 20c are exposed in the vicinity of the through hole 13 held by the inner fixed frame portion 12, and the outer power supply lines 19a and 19c are held in the outer fixed frame portion 14 and in the vicinity of a terminal (not shown). The end portions 21a and 21c are exposed. Voice coil lead wires (not shown) are electrically connected to the end portions 20a and 20c, and the end portions 21a and 21c are electrically connected to terminals.
[0031]
Further, in the range from the vicinity of the top portion 17T of the roll portion 17 to the intermediate portion 17M, the openings are uniformly opened by processing steps such as etching and punching, and the opening ratio is set to be large and equal to about 75%, for example. In the range from the intermediate portion 17M to the vicinity of the fixed end 17B of the roll portion 17 with the opening ratio of the end 17B being zero, an opening portion in which the opening ratio is gradually changed from 75% to zero is provided. Further, a joining member 22 formed of a phenol resin-impregnated cloth is insert-molded on the bobbin joining portion of the voice coil on the inner wall of the through hole 13 of the inner fixing frame portion 12.
[0032]
The operation of the speaker damper configured as described above will be described.
When an input is applied to the terminal, a driving current is applied to a voice coil (not shown) via the outer power supply lines 19a and 19c, the roll portions 17a and 17c and the inner power supply lines 18a and 18c formed from a conductive metal foil plate. The inner fixed frame 12 to which the voice coil bobbin is inserted and fixed vibrates in the vibration axis direction when applied and receiving driving force. At this time, the roll portion 17 formed of a metal foil plate acts as a leaf spring, and supports the vibration system while being balanced with the driving force by deformation.
[0033]
Here, in the range from the vicinity of the top portion 17T of the roll portion 17 to the intermediate portion 17M, the openings are uniformly opened by processing steps such as etching and punching so that the opening ratio is set to be large and equal, and the opening ratio of the fixed end 17B of the roll portion 17 is set. In the range from the intermediate portion 17M to the vicinity of the fixed end 17B of the roll portion 17, the opening width gradually changes to be small in the range from the intermediate portion 17M to the fixed end 17B of the roll portion 17, so that the plate width that determines the flexibility of the leaf spring is equivalent The vibration amplitude is narrow near the top and gradually widened near the fixed end 17B, so that it acts as a highly flexible speaker damper in a region where the vibration amplitude is small, and the deformation of the intermediate portion determines the flexibility. It gives force-displacement characteristics with good linearity up to the region, and gradually changes to lower flexibility when the vibration amplitude becomes larger, suppressing the vibration amplitude of the vibration system. Thereby preventing the abnormal sound radiation due to contact of the like magnetic circuit of the system.
[0034]
In addition, since the power supply line is held in the part and the roll unit 17 also serves as the power supply line, abnormal sound radiation, power supply line breakage, etc. that are generated when the power supply line comes into contact with other parts during vibration are supplied. Inconvenient phenomena related to the wires themselves can be avoided.
[0035]
In the above embodiment, the semi-cylindrical roll portions 17 are all explained in a convex shape. However, in the case where an even number of roll portions 17 are arranged, by arranging the roll portions 17 alternately in a convex shape and a concave shape, The center holding property in the vibration axis direction and the vertical symmetry of the force-displacement characteristic can be improved. Furthermore, when a flat metal foil plate is deformed and inserted, and insert molding is performed, since the center holding in the vibration axis direction is set in a state where the stress generated in the roll portion 17 is balanced, response is possible even in a minute vibration amplitude region. The sex becomes even better.
[0036]
Further, by coating the roll portion 17 with rubber or resin, vibration due to natural resonance in the high frequency region can be effectively damped.
[0037]
(Embodiment 2)
Another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a partial cross-sectional view of the speaker damper, similar 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.
[0038]
According to the figure, the difference from the first embodiment is the configuration of the roll portion 17, each side of the inner fixed frame portion 12 being fixed ends 15 (15ai, 15bi, 15ci, 15di), and the outer fixed frame portion 14. A cross section made of a metal foil plate made of stainless steel, phosphor bronze, or the like formed by insert molding so that each side is fixed end 16 (16ao, 16bo, 16co, 16do) and extends from said fixed end 15 and fixed end 16 At least a pair of substantially circular cylinders 23 are formed, and are configured by an upper roll portion 17 (17au, 17bu, 17cu, 17du) and a lower roll portion 17 (17ad, 17bd, 17cd, 17dd), respectively. The aperture ratio is increased at the top (bottom) of the roll portion 17 and decreased near the fixed end, as in the first embodiment. This achieves a speaker damper that can improve center retention by further improving symmetry in the vibration axis direction and improving resistance to lateral displacement.
[0039]
(Embodiment 3)
Another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a partial cross-sectional view of the speaker damper, similar to FIG. In the description of the embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
[0040]
According to the figure, the difference from the first and second embodiments is the configuration of the roll portion 17 and the auxiliary power supply line, and each side of the inner fixed frame portion 12 is a fixed end 15 (15ai, 15bi, 15ci, 15di). Each of the sides of the outer fixed frame portion 14 is a fixed end 16 (16ao, 16bo, 16co, 16do), and a roll portion 17 (17a, 17b, 17c, extended so as to bridge the fixed end 15 and the fixed end 16) 17d) is formed by injection molding, and in the range from the vicinity of the top portion 17T of the roll portion 17 to the intermediate portion 17M, the thickness is set to be thin and equal, and the thickness of the fixed end 17B of the roll portion 17 is increased. In the range from the intermediate portion 17M to the vicinity of the fixed end 17B of the roll portion 17, a thick portion that gradually increases in thickness is provided, so that a high-flexibility speaker damper is provided in a region where the vibration amplitude is small. It acts as a-giving a force-displacement characteristic with good linearity, and when the vibration amplitude is large, it gradually changes to low flexibility and can prevent abnormal sound radiation due to hitting the magnetic circuit of the vibration system, etc. Is capable of integral resin molding.
[0041]
Also, a pair of conductive metal foils 24 (24a, 24c) are insert-molded into the inner fixed frame portion 12, each one end 24 of the conductive metal foil 24 is exposed in the vicinity of the voice coil lead wire, and the other end 24ao. Is exposed at the corners of the inner fixed frame portion 12 so that the feed line can be drawn out to the external terminal at the shortest distance, and inconveniences such as making an abnormal sound by hitting the roll portion 17 during vibration can be avoided.
[0042]
In the above embodiment, the semi-cylindrical roll portions 17 are all described in a convex shape. However, when an even number of roll portions 17 are arranged, the roll portions 17 are alternately arranged in a convex shape and a concave shape, The center holding property in the vibration axis direction and the vertical symmetry of the force-displacement characteristic can be improved. Further, at least a pair of cylindrical bodies having a substantially circular cross section may be formed by resin molding of the resin-molded semi-cylindrical roll portion 17 described in the third embodiment, and the upper roll portion 17 and the lower roll The shape effect of the portion 17 realizes a speaker damper capable of improving the center retaining property by further improving the symmetry in the vibration axis direction and improving the resistance to lateral displacement.
[0043]
As described above, the speaker damper according to the present invention is divided in the circumferential direction, and is composed of a linear cylindrical or semi-cylindrical roll portion arranged in a polygonal shape, so that it is high in a region where the vibration amplitude is small. Acts as a damper for a flexible speaker, can set the lowest resonance frequency of the speaker low, can realize a relatively small speaker capable of reproducing deep bass, and vibration that determines the flexibility by deformation of the middle part Up to the amplitude region, force-displacement characteristics with good linearity are given, and the center retention is improved by further improving the symmetry in the vibration axis direction by arranging the roll part vertically and improving the resistance to lateral displacement. In addition, when the shape of the metal foil plate is maintained and insert molding is performed, the center holding in the vibration axis direction is set in a state where the stress generated in the roll portion is balanced. For this reason, since the responsiveness is further improved even in the minute vibration amplitude region, a speaker with good power linearity can be realized, and when the vibration amplitude becomes larger, the degree of vibration gradually changes to lower flexibility. Since the amplitude is suppressed, it is possible to provide a loudspeaker capable of preventing abnormal sound emission due to hitting a vibration magnetic circuit or the like.
[0044]
【The invention's effect】
As described above, the speaker damper according to the present invention is constituted by a linear cylindrical or semi-cylindrical roll section that is divided in the circumferential direction and arranged in a polygonal shape, so that the voice coil bobbin joint is a vibration axis. When the roll vibrates back and forth, the curvature of the roll part changes and the vibration amplitude increases, resulting in a large amplitude value, and a straight line from the viewpoint of vertical symmetry and hysteresis in a relatively wide range of vibration amplitudes. It is an object of the present invention to provide a loudspeaker damper capable of obtaining good force-displacement characteristics and suppressing vibration amplitude at the amplitude limit.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of a speaker damper according to the present invention.
FIG. 2 is a partial cross-sectional view taken along line A-O-B in FIG.
FIG. 3 is a development view of the metal foil plate which is the main part of the same.
FIG. 4 is a partial cross-sectional view taken along the line AOB of the other embodiment.
FIG. 5 is a partial cross-sectional view taken along the line AOB of the other embodiment;
6A is a plan view of a conventional speaker damper. FIG.
(B) Same half sectional view
FIG. 7 is a deformation diagram in which the deformation posture is overwritten.
FIG. 8A is a plan view of a speaker damper in which slits are added to the speaker damper at several places.
(B) Schematic diagram expressing one section divided by a slit with a thin plate
(C) The figure which expressed the same figure (b) by the laminated leaf spring structure.
FIG. 9 is a sectional view of the speaker.
[Explanation of symbols]
11 Speaker damper
12 Inner fixed frame
13 Through hole
14 Outer fixing frame
15 (15ai, 15bi, 15ci, 15di) The fixed end of the inner fixed frame portion 12
16 (16ao, 16bo, 16co, 16do) Fixed end of the outer fixed frame portion 14
17 (17a, 17b, 17c, 17d) Roll part
Top of 17T roll part 17
Intermediate part of 17M roll part 17
17B Fixed end of the roll part 17
17 (17au, 17bu, 17cu, 17du) Upper roll part
17 (17ad, 17bd, 17cd, 17dd) Lower roll part
18a, 18c Inside feed line
19a, 19c Outer feeder
20a, 20c End of inner feed line
21a, 21c End of outer feed line
23 Cylindrical body with a substantially circular cross section
24a, 24c conductive metal foil

Claims

The outer fixed frame portion having a polygonal outer shape having a through-hole into which the voice coil bobbin is inserted and fixed, and the outer fixed frame portion having parallel sides facing the outer sides of the inner fixed frame portion on the inner diameter side are opposed to each other. A damper formed by a roll part extending from the fixed end with each side as a fixed end. The damper has a large opening ratio in the vicinity of the top of the roll part, and the opening ratio of the fixed part of the roll part is made zero or small. And a damper for a speaker provided with an opening having a gradually reduced opening ratio in the vicinity of the fixed end of the roll.

The outer fixed frame portion having a polygonal outer shape having a through-hole into which the voice coil bobbin is inserted and fixed, and the outer fixed frame portion having parallel sides facing the outer sides of the inner fixed frame portion on the inner diameter side are opposed to each other. It is a damper formed by a roll part extending from the fixed end with each side as a fixed end, and the thickness near the top of the roll part is reduced, and the fixed end of the roll part is increased in thickness. A damper for a speaker provided with a thickened portion that is gradually increased in the vicinity of the fixed end of the roll portion.

The inner fixed frame portion formed of an even polygon, and the opposing sides of the inner fixed frame portion and the outer fixed frame portion are fixed ends, and the roll portion extending from the fixed end is an upper roll portion and a lower roll. The damper for speakers according to claim 1 or 2, wherein the portions are alternately formed.

The outer fixed frame portion having a polygonal outer shape having a through-hole into which the voice coil bobbin is inserted and fixed, and the outer fixed frame portion having parallel sides facing the outer sides of the inner fixed frame portion on the inner diameter side are opposed to each other. At least a pair of cylindrical bodies having a substantially circular cross section extending with each side as a fixed end are formed, and the opening ratio is large in the vicinity of the top portion of the upper roll portion and the bottom portion of the lower roll portion. The speaker damper is provided with an opening having an opening ratio that is gradually reduced in the vicinity of the fixed end of the roll portion with the opening ratio of the fixed end of the roll portion being zero or small.

The outer fixed frame portion having a polygonal outer shape having a through-hole into which the voice coil bobbin is inserted and fixed, and the outer fixed frame portion having parallel sides facing the outer sides of the inner fixed frame portion on the inner diameter side are opposed to each other. Each side has a fixed end, and is a damper in which at least a pair of substantially circular cylinders extending from the fixed end are formed, near the top of the upper roll part and the bottom of the lower roll part. A loudspeaker damper provided with a thickened portion with a reduced thickness, a thickened thickness at the fixed end of the roll portion, and a gradually increased thickness near the fixed end of the roll portion.

None the aperture ratio of the top near the roll portion Daito, formed before inserting the roll unit with a non-magnetic metal foil plate, the aperture ratio of the fixed end was possible preset to zero or a small roll portion, the inner fixed frame section 5. The speaker damper according to claim 1 , wherein each of the opposing sides of the outer fixed frame portion is a fixed end, and the roll portion is insert-molded so as to bridge both fixed ends. .

The damper for a speaker according to claim 6, wherein a material for forming the roll portion is nonmagnetic stainless steel or phosphor bronze foil plate.

The speaker damper according to claim 6, wherein the roll portion is coated with rubber or resin having a large mechanical internal loss.

The speaker damper according to any one of claims 1 to 6, wherein a joining member molded with a phenol resin-impregnated cloth is insert-molded at a voice coil bobbin joint portion of an inner wall of a through hole of the inner fixed frame portion .

A pair of conductive metal foils were insert-molded into the inner fixed frame part, each one end of the conductive metal foil was exposed in the vicinity of the voice coil lead wire, and the other end was exposed at a corner of the inner fixed frame part. The speaker damper according to any one of claims 1 to 6.

A pair of inner feed lines made of conductive metal foil plates are insert-molded into the inner fixed frame part, and a pair of outer feed lines are similarly insert-molded into the outer fixed frame part, and each end of the inner feed line is voiced Exposed in the vicinity of the coil lead wire, each other end is joined to a corresponding roll portion formed from a conductive metal foil plate at the fixing portion of the roll portion of the inner fixing frame portion, and each one end of the outer feeder line is connected The speaker damper according to claim 6, wherein the speaker damper is exposed to the terminal connection portion, and each other end is joined to each roll portion by a fixing portion of the roll portion of the outer fixing frame portion.

The damper for a speaker according to claim 11 , wherein at least a pair of roll portions is formed of a conductive metal foil plate, and an inner feeding line and an outer feeding line are integrally formed on each of the roll parts.

A magnetic circuit having at least a magnetic gap, a frame attached to the magnetic circuit, and a voice coil whose outer periphery is directly or indirectly coupled to the frame and whose inner periphery is fitted in the magnetic gap of the magnetic circuit. A diaphragm and an outer periphery are coupled to the frame and an inner periphery is coupled to a voice coil to support the voice coil, or to support the voice coil. A speaker comprising the speaker damper according to any one of 12 .