JP3651455B2

JP3651455B2 - Speaker

Info

Publication number: JP3651455B2
Application number: JP2002195506A
Authority: JP
Inventors: 修舟橋
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2002-04-15
Filing date: 2002-07-04
Publication date: 2005-05-25
Anticipated expiration: 2022-07-04
Also published as: JP2004007332A

Description

【０００１】
【発明の属する技術分野】
本発明は、スピーカに関するものである。
【０００２】
【従来の技術】
従来のスピーカは図２３に示すような構成となっていた。
【０００３】
すなわち、この図２３に示すように、このスピーカは、磁気回路１と、この磁気回路１の磁気ギャップ２内に少なくともそのコイル部３が可動自在に設けられたボイスコイル体４と、このボイスコイル体４の磁気ギャップ２外方部分に、その内周が連結された振動板５と、この振動板５の外周がエッジ６を介して連結されたフレーム７とを備えた構成となっていた。
【０００４】
すなわち、ボイスコイル体４のボイスコイル部３にオーディオアンプ等から出力された電気信号を入力することで、ボイスコイル体４が起振し、その起振力が振動板５に伝達され、振動板５が空気を振動させて電気信号を音声に変換する構成となっていた。
【０００５】
【発明が解決しようとする課題】
上記従来例においては、図２３に示すように、ボイスコイル体４のボイスコイル部３と振動板５内周固定部分との間にダンパー８の内周が固定され、このダンパー８の外周はフレーム７に固定されている。このダンパー８はエッジ６とともにサスペンションを構成し、ボイスコイル体４が可動時にローリングしないようにしている。また、このダンパー８は図２３に示すように複数の波形を組み合わせた形状にして、できるだけボイスコイル体４の可動負荷とならないような構成となっている。
【０００６】
しかし、近年のスピーカの高性能化においては、このダンパー８が存在することによって大きな問題が発生している。
【０００７】
すなわち、ボイスコイル体４が磁気回路１へ向かう挙動と、磁気回路１とは反対側へ向かう挙動においてダンパー８の可動負荷の非直線性や非対称性が大きく、これに起因する高調波ひずみが大きく発生すると同時にパワーリニアリティも悪化することになっていた。
【０００８】
図２４は従来のスピーカのパワーリニアリティ、スピーカ入力電力に対する振動板５の変位を示している。Ａは磁気回路１に向けた振動板５の振幅特性を示し、Ｂは磁気回路１とは反対方向の振動板５の振幅特性を示す。また、図２５には従来のスピーカの高調波ひずみ特性を示し、Ｃがスピーカの周波数特性、Ｄが第２高調波ひずみ特性、Ｅが第３高調波ひずみ特性である。
【０００９】
このような非直線性や非対称性に起因するパワーリニアリティ悪化や高調波ひずみ特性の課題を解決するため、各社とも、ダンパー８の非直線性や非対称性を解決するため種々の工夫をしているが、このダンパー８は上述のごとく、その可動負荷を少なくするように複数の波形を組み合わせて出来たものであるから、このダンパー８とエッジ６を組み合わせてサスペンションを構成する以上は、非直線性や非対称性を解決して高調波ひずみを低減させることが難しく、スピーカの高性能化が出来ていないのが現状である。そこで本発明は、スピーカの高性能化を図ることを目的とするものである。
【００１０】
【課題を解決するための手段】
そして、この目的を達成するために本発明の請求項１に記載の発明は、磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周が連結された振動板と、この振動板の外周が第１のエッジを介して連結されたフレームとを備え、前記ボイスコイル体の前記振動板より前記磁気回路側にサスペンションホルダの内周を連結し、このサスペンションホルダの外周部分を第２のエッジを介して前記フレームに連結し、これら第１、第２のエッジは、これら第１、第２のエッジ間を境にして略対称相似形状とするとともに、前記振動板と前記サスペンションホルダを、その中間どうしで結合し、前記サスペンションホルダの中部から前記第２のエッジの間の部分を外周方向へ湾曲させたものである。つまり第１のエッジと第２のエッジによりサスペンションを構成させることでサスペンションの非直線性及び非対称性の要因となるダンパーを排除するとともに、第１のエッジと第２のエッジはそれ自体の非対称性をキャンセルするように配置させたので、サスペンションの非直線性及び非対称性を根本的に解決することができ、これに起因するスピーカの高調波ひずみ低減とパワーリニアリティを向上させてスピーカの性能を向上させることができる。また、振動板とサスペンションホルダを、その中部どうしで結合することで、両者の位相を合わせることができ、これに起因する中低音域の周波数特性を平坦化することができる。
【００１１】
さらに、サスペンションホルダを外方に湾曲することにより、共振周波数を分散させることができる。
【００１２】
次に本発明の請求項１９に記載の発明は、磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周部分が連結されたサスペンションホルダと、このサスペンションホルダの外周部分が第２のエッジを介して連結されたフレームと、前記サスペンションホルダの中部に内周を連結し、外周は第１のエッジを介して前記フレームに連結した振動板とを備え、前記第１、第２のエッジは、これら第１、第２のエッジ間を境にして略対称相似形状とし、前記サスペンションホルダの中部から前記第２のエッジの間の部分を外周方向へ湾曲させたものである。
【００１３】
つまり第１のエッジと第２のエッジによりサスペンションを構成させることでサスペンションの非直線性及び非対称性の要因となるダンパーを排除するとともに、第１のエッジと第２のエッジはそれ自体の非対称性をキャンセルするように配置させることにより、サスペンションの非直線性及び非対称性を根本的に解決することができ、これに起因するスピーカの高調波ひずみ低減とパワーリニアリティを向上させてスピーカの性能を向上させることができる。また、振動板の内周をサスペンションホルダの中部に連結したので、サスペンションホルダと磁気回路の振幅ストロークを大きく稼ぐことで耐入力性能も向上できる。
【００１４】
次に本発明の請求項３７に記載の発明は、磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周が連結された振動板と、この振動板の外周が第１のエッジを介して連結されたフレームとを備え、前記振動板の中部にサスペンションホルダの内周を連結し、このサスペンションホルダの外周は第２のエッジを介して前記フレームに連結し、これら第１、第２のエッジは、これら第１、第２のエッジ間を境にして略対称相似形状とし、前記サスペンションホルダの中部から前記第２のエッジの間の部分を外周方向へ湾曲させたものである。つまり第１のエッジと第２のエッジによりサスペンションを構成させることでサスペンションの非直線性及び非対称性の要因となるダンパーを排除するとともに、第１のエッジと第２のエッジはそれ自体の非対称性をキャンセルするように配置させたものであるので、サスペンションの非直線性及び非対称性を根本的に解決することができ、これに起因するスピーカの高調波ひずみ低減とパワーリニアリティを向上させてスピーカの性能を向上させることができる。また、振動板の中部にサスペンションホルダの内周を連結することにより振動系の軽量化で音響変換効率を上げることもできる。
【００１５】
次に本発明の請求項５５に記載の発明は、磁気ギャップを有する磁気回路と、この磁気回路の前記磁気ギャップ内に少なくともそのコイル部が可動自在に設けられたボイスコイル体と、このボイスコイル体の磁気ギャップ外方部分に、その内周が連結された振動板と、この振動板の外周が第１のエッジを介して連結されたフレームとを備え、前記ボイスコイル体の前記振動板より前記磁気回路側にサスペンションホルダの内周を連結し、このサスペンションホルダの外周は第２のエッジを介して前記フレームに連結し、前記サスペンションホルダの中部から前記第２をエッジの間の部分を外周方向へ湾曲させた。これら第１、第２のエッジは、それぞれの非直線性をキャンセルするように関係づけたものであるので、サスペンションの非直線性及び非対称性の要因となるダンパーを排除するとともに、第１のエッジと第２のエッジはそれ自体の非対称性をキャンセルするようにしたので、サスペンションの非直線性及び非対称性を根本的に解決することができ、これに起因するスピーカの高調波ひずみ低減とパワーリニアリティを向上させてスピーカの性能を向上させることができる。
【００１６】
次に本発明の請求項２，２０，３８に記載の発明は、サスペンションホルダの外周部分を、第２のエッジを介してフレームに連結させるとともに、第２のエッジと前記サスペンションホルダの外周部分は平面重合部で連結させたものであって、これによりこの連結部分にかかる応力をサスペンションホルダに分散させることができるため、スピーカの耐入力性能をより向上させることができる。
【００１７】
次に本発明の請求項３，２１，３９に記載の発明は、サスペンションホルダの外周部分において、サスペンションホルダと第２のエッジはＬ字状として平面重合部で連結したものであり、これによりサスペンションホルダと第２のエッジの連結部分にかかる応力を分散させる効果が増大するため、スピーカの耐入力性能をより向上させることができる。
【００１８】
次に本発明の請求項４，２２，４０に記載の発明は、サスペンションホルダの外周部分の先端を曲折させながら延長したものであり、これにより請求項３，２１，３９に記載の発明よりも連結部分にかかる応力を分散させる効果がさらに増大するため、スピーカの耐入力性能をより一層向上させることができる。
【００１９】
次に本発明の請求項５，２３，４１に記載の発明は、振動板の外周部分の先端を曲折させながら延長したものであり、これにより振動板と第１のエッジの連結部分にかかる応力を分散させることができるため、スピーカの耐入力性能をより一層向上させることができる。
【００２０】
次に本発明の請求項６，２４，４２に記載の発明は、振動板にコルゲーションを設けたものであり、これにより振動板の剛性が向上するため、スピーカの耐入力性能をより向上させることができる。
【００２１】
次に本発明の請求項７，２５，４３に記載の発明は、ボイスコイル体のボビンと、サスペンションホルダを金属材料で形成したものであって、ボイスコイル体の発熱をそのボビンとサスペンションホルダを介して効率良く空間へ放熱することができ、スピーカの耐入力性能を向上させることができる。
【００２２】
次に本発明の請求項８，２６，４４に記載の発明は、第１のエッジは磁気回路とは反対方向に突出する形状にし、第２のエッジは磁気回路に向けて突出する形状としたものであって、前記第１のエッジと前記第２のエッジの位置関係が近接している場合においても、前記第１のエッジと前記第２のエッジの可動接触を避けることができ、スピーカの振幅余裕を大きくとることで、最大音圧を大きくすることができる。
【００２３】
次に本発明の請求項９，２７，４５に記載の発明は、第１のエッジは磁気回路に向けて突出する形状とし、第２のエッジは振動板に向けて突出する形状としたものであって、前記第１のエッジの前方にネットなどの音響開口部が近接している場合においても前記第１のエッジと音響ネットの接触を避けることができ、スピーカの振幅余裕を大きくとることで、最大音圧を大きくすることができる。
【００２４】
次に本発明の請求項１０，２８，４６に記載の発明は、第１のエッジと第２のエッジの弾性率を略同等に設定したものであって、前記第１のエッジと前記第２のエッジはそれ自体のもつ非直線性を正確にキャンセルすることができ、サスペンションの非対称性を大きく改善することができ、これに起因するスピーカ装置の高調波ひずみ低減とパワーリニアリティを向上させることができる。
【００２５】
次に本発明の請求項１１，２９，４７に記載の発明は、第１のエッジと第２のエッジをウレタンで形成したものであって、第１、第２のエッジを有する本発明のスピーカにおいても振動系重量増加を少なく抑えることができ、振動系重量増加に伴うスピーカの能率低下を抑えることができる。
【００２６】
次に本発明の請求項１２，３０，４８に記載の発明は、サスペンションホルダをパルプで形成したものであって、サスペンションホルダを有する本発明のスピーカにおいても振動系重量増加を少なく抑えることができ、振動系重量増加に伴うスピーカの能率低下を抑えることができる。
【００２７】
次に本発明の請求項１３，３１，４９に記載の発明は、サスペンションホルダの外周側を、フレーム内端よりも磁気回路側にて第２のエッジを介してフレームに連結したものであって、第１のエッジと前記第２のエッジの支点間距離を大きくとることができ、ダンパーがなくてもボイスコイル体が可動時にローリングするのを防止することができる。
【００２８】
次に本発明の請求項１４，３２，５０に記載の発明は、サスペンションホルダと磁気回路の間に防塵ネットを取り付けたものであって、磁気回路の磁気ギャップ内へ塵などが入るのを未然に防止することができ、ボイスコイル体を円滑に可動させることができる。
【００２９】
次に本発明の請求項１５，３３，５１に記載の発明は、フレームの内端は磁気回路に連結し、このフレームの内端側に通気口を設け、この通気口部分に防塵ネットを設けたものであって、磁気回路の磁気ギャップ内へ塵などが入るのを未然に防止することができ、ボイスコイル体を円滑に可動することができる。
【００３０】
次に本発明の請求項１６，３４，５２に記載の発明は、サスペンションホルダに開口部を設けたものであって、サスペンションホルダからの音響出力を低く抑えることができ、サスペンションホルダの音響出力が振動板に干渉してスピーカの音響特性が劣化するのを抑えることができる。
【００３１】
次に本発明の請求項１７，３５，５３に記載の発明は、フレームの第１、第２のエッジ間部分に開口部を設けたものであって、振動板と、第１のエッジ、フレーム、第２のエッジ、サスペンションホルダ、ボイスコイル体で中間チャンバが形成されるのを防止し、この中間チャンバ形成によりサスペンションホルダの音響出力が振動板に干渉してスピーカの音響特性が劣化するのを抑えることができる。
【００３２】
次に本発明の請求項１８，３６，５４に記載の発明は、このスピーカを比較的容積の小さい密閉箱に入れた場合に、第１のエッジより第２のエッジの弾性率を大きく設定したものであって、比較的容積の小さい密閉箱に入れて使用する場合でも前記第１のエッジと前記第２のエッジはそれ自体の持つ非直線性を正確にキャンセルすることができ、サスペンションの非対称性を大きく改善し、これに起因するスピーカ装置の高調波ひずみ低減とパワーリニアリティを向上させることができる。
【００３３】
【発明の実施の形態】
以下、本発明の実施の形態を図を用いて説明する。
【００３４】
（実施の形態１）
図１は本発明の実施の形態１のスピーカの断面図を示し、図１において、９はリング状のマグネット１０、リング状のプレート１１、円板状のヨーク１２、円柱状のポール１３による磁気回路であり、プレート１１の内周とポール１３の外周間の磁気ギャップ１４にマグネット１０の磁束を集中させる。マグネット１０にはフェライト系や希土類コバルト系が、プレート１１及びヨーク１２、ポール１３には鉄が主な材料として用いられている。なお、図１では外磁型の例を示しているが内磁型の磁気回路も幅広く用いられている。１５は磁気回路９の磁気ギャップ１４内に少なくともそのコイル部１６が可動自在に設けられた円筒状のボイスコイル体であり、一般的には紙及び樹脂、アルミ等の金属を材料としたボビンの上に、銅線などのコイルを巻いて構成している。
【００３５】
１７はボイスコイル体１５の磁気ギャップ外方部分に、その内周が連結された逆円錐状の振動板であり、ボイスコイル体１５に起振された振動により実際に音を出すもので、高い剛性と内部損失を両立したパルプ及び樹脂が主な材料として用いられる。１８は振動板１７の外周に結合されたリング状の第１のエッジであり、振動板１７に可動負荷を加えないようにウレタン及びゴム、布などの材料が用いられる。１９は振動板１７の外周が第１のエッジ１８を介して連結された皿状のフレームであり、複雑な形状にも対応できるように鉄板プレス品や樹脂成型品及びアルミダイキャストなどの材料が用いられる。
【００３６】
２０はボイスコイル体１５の振動板１７より磁気回路９側に、その内周を連結したサスペンションホルダであり、高い剛性と内部損失を両立したパルプ及び樹脂が主な材料として用いられる。２１はサスペンションホルダ２０の外周をフレーム１９に結合する第２のエッジであり、第１のエッジ１８と同様にサスペンションホルダ２０に可動負荷を加えないようにウレタン及びゴム、布などの材料が用いられる。ここで、サスペンションホルダ２０は第２のエッジ２１との連結部分にかかる応力を分散させるため、中部から第２のエッジ２１との連結部分との間の部分を外周方向へ湾曲させている。第１のエッジ１８は磁気回路９とは反対方向に突出し、第２のエッジ２１は磁気回路９側に突出しているが、これら第１、第２のエッジ１８，２１間を境にして略対称相似形状となっている。
【００３７】
図２は、本発明の実施の形態１のスピーカのパワーリニアリティであり、入力電力に対する振動板１７の振幅量を示している。Ａは磁気回路９側への入力電力−振動板振幅特性である。また、Ｂは磁気回路９と反対側への入力電力−振動板振幅特性である。
【００３８】
図３は、本発明の実施の形態１のスピーカの高調波ひずみ特性であり、出力音圧と高調波ひずみのダイナミックレンジが大きいほど、その高調波ひずみが少ないことを示す。Ｃがスピーカ特性で、Ｄが第２高調波ひずみ特性、Ｅが第３高調波ひずみ特性である。
【００３９】
以上のように構成された実施の形態１のスピーカについて、以下その動作について説明する。
【００４０】
ボイスコイル体１５のコイル部１６にオーディオアンプ等から出力された電気信号を入力することで、ボイスコイル体１５が起振し、その起振力が振動板１７に伝達され、振動板１７が空気を振動させて電気信号を音声に変換する。
【００４１】
また、ボイスコイル体１５とフレーム１９の間には従来のダンパーに代わってサスペンションホルダ２０と第２のエッジ２１によるサスペンションが設けられている。このサスペンションホルダ２０及び第２のエッジ２１は、第１のエッジ１８と共にサスペンションを構成し、ボイスコイル体１５が可動時にローリングしないように設けられているものである。
【００４２】
このため、第１のエッジ１８と第２のエッジ２１によりサスペンションを構成させることができ、サスペンションの非直線性及び非対称性の要因となるダンパーを排除することができる。また、第１のエッジ１８と第２のエッジ２１はそれ自体の非対称性をキャンセルするように略対称相似形状となっている。具体的には第１のエッジ１８と第２のエッジ２１の突出する方向が反対になるように対向配置されており、これにより図２のＡ、Ｂで示すパワーリニアリティの入力電力−振動板振幅特性のごとく、サスペンションの非直線性及び非対称性を根本的に解決することができる。
【００４３】
このため、図３のＤ、Ｅで示すスピーカの高調波ひずみ特性のごとく、サスペンションの非直線性及び非対称性に起因する高調波ひずみを低減することができ、スピーカの高性能化が実現できる。
【００４４】
（実施の形態２）
次に図４について説明する。図４は、本発明の実施の形態２の断面図を示し、実施の形態１と同じ構成のものに関しては同一の符号を付している。図４において、２６はサスペンションホルダ２５の内周と外周の間の中部に、その内周が連結された逆円錐台状の振動板であり、その外周は第１のエッジ１８を介してフレーム１９に連結されている。ここで、サスペンションホルダ２５は、第２のエッジ２１との連結部分にかかる応力を分散させるため、中部から第２のエッジ２１との連結部分との間の部分を外周方向へ湾曲させている。このため、振動板２６の大幅な軽量化が可能となり、このスピーカ自体の音響変換効率を向上することができる。
【００４５】
（実施の形態３）
次に図５について説明する。図５は実施の形態３の断面図を示し、実施の形態１〜２と同じ構成のものに関しては同一の符号を付している。図５において、２７は振動板１７の内周と外周の間の中部に、その内周が連結された円錐台状のサスペンションホルダであり、その外周は第２のエッジ２１を介してフレーム１９に連結されている。ここで、サスペンションホルダ２７は、第２のエッジ２１との連結部分にかかる応力を分散させるため、中部から第２のエッジ２１との連結部分との間の部分を外周方向へ湾曲させている。このため、サスペンションホルダ２７の大幅な軽量化が可能となり、このスピーカ自体の音響変換効率を向上することができる。
【００４６】
（実施の形態４）
次に図６について説明する。図６（ａ）は実施の形態４の断面図、図６（ｂ）に第２のエッジ２１とサスペンションホルダ２０との連結部分の拡大図を示す。実施の形態１〜３と同じ構成のものに関しては同一の符号を付している。図６において、サスペンションホルダ２０は、中部から第２のエッジ２１との連結部分との間の部分を外周方向へ湾曲させている。さらに、第２のエッジ２１とサスペンションホルダ２０の外周部分は平面重合部２０Ａで連結されているので、連結部分にかかる応力を分散させることができるため、スピーカの耐入力性能をより向上させることができる。
【００４７】
（実施の形態５）
次に図７について説明する。図７は実施の形態５の要部拡大断面図を示す。図７において、サスペンションホルダ２０は、中部から第２のエッジ２１との連結部分との間の部分を外周方向へ湾曲させている。さらに、サスペンションホルダ２０の外周部分において、サスペンションホルダ２０と第２のエッジ２１はＬ字状に平面重合部２０Ａで連結している。これにより、サスペンションホルダ２５と第２のエッジ２１との連結部分にかかる応力を分散させる効果が増大するため、スピーカの耐入力性能をより向上させることができる。
【００４８】
（実施の形態６）
次に図８について説明する。図８は実施の形態６の要部拡大断面図を示す。図８において、サスペンションホルダ２０の外周部分の先端を曲折させながら延長している。これにより、サスペンションホルダ２０と第２のエッジ２１との連結部分にかかる応力を分散させる効果がさらに増大するため、スピーカの耐入力性能をより向上させることができる。
【００４９】
（実施の形態７）
次に図９について説明する。図９は実施の形態７の要部拡大断面図を示す。図９において、振動板１７の外周部分の先端を曲折させながら延長している。これにより、振動板１７と第１のエッジ１８との連結部分が強化され、この連結部分にかかる応力を分散させることができるため、スピーカの耐入力性能をより向上させることができる。
【００５０】
（実施の形態８）
次に図１０について説明する。図１０は実施の形態８の断面図を示し、実施の形態１〜７と同じ構成のものに関しては同一の符号を付している。図１０において、振動板１７の中部から第１のエッジ１８の間の部分にコルゲーションを設けてある。これにより、振動板１７の剛性が向上するため、スピーカの耐入力性能をより向上させることができる。
【００５１】
（実施の形態９）
次に図１１について説明する。図１１は実施の形態９の断面図を示し、実施の形態１〜８と同じ構成のものに関しては同一の符号を付している。図１１においては、サスペンションホルダ２０はボイスコイル体１５のボビンとともに熱伝導性の高い金属の材料で構成している。
【００５２】
このため、ボイスコイル体１５の発熱をこのボイスコイル体１５のボビンとサスペンションホルダ２０を介して効率良く空間へ放熱することが可能でボイスコイル体１５の温度上昇を抑えることができる。このため、高温で接着強度が低下する接着剤であってもボイスコイル体１５と、振動板１７及びサスペンションホルダ２０の接着強度を十分に確保することができるため、スピーカの耐入力性能を向上させることができる。
【００５３】
（実施の形態１０）
次に図１２について説明する。図１２は実施の形態１０の断面図を示し、実施の形態１〜９と同じ構成のものに関しては同一の符号を付している。図１２においては、第１のエッジ１８は磁気回路９とは反対方向に突出する形状にし、第２のエッジ２１は磁気回路９に向けて突出する形状とした構成としている。
【００５４】
このため、第１のエッジ１８と第２のエッジ２１の位置関係が近接している場合においても、第１のエッジ１８と第２のエッジ２１の可動接触を避けることができるため、スピーカの振幅余裕を大きくとることで、最大音圧を大きくすることができる。
【００５５】
（実施の形態１１）
次に図１３について説明する。図１３は実施の形態１１の断面図を示し、実施の形態１〜１０と同じ構成のものに関しては同一の符号を付している。図１３においては、第１のエッジ１８は磁気回路９に向けて突出する形状とし、第２のエッジ２１は振動板１７に向けて突出する形状とした構成としている。
【００５６】
このため、第１のエッジ１８の前方にネットなどの音響開口部が近接している場合においても第１のエッジ１８と音響ネットの接触を避けることができるため、スピーカの振幅余裕を大きくとることで、最大音圧を大きくすることができる。
【００５７】
（実施の形態１２）
次に図１４について説明する。図１４は実施の形態１２の断面図を示し、図１４においては、第１のエッジ１８と第２のエッジ２１の弾性率を略同等に設定した。
【００５８】
このため、第１のエッジ１８と第２のエッジ２１はそれ自体の持つ非直線性及び非対称性を正確にキャンセルすることが可能となり、サスペンションの非直線性及び非対称性を大きく解決することができ、これに起因するスピーカ装置の高調波ひずみやパワーリニアリティを大幅に低減させることができる。
【００５９】
（実施の形態１３）
次に図１５について説明する。図１５は実施の形態１３の断面図を示し、図１５においては、第１のエッジ１８と第２のエッジ２１をウレタンで形成した。
【００６０】
このため、第１、第２のエッジ１８，２１を有する本発明の実施の形態１３のスピーカにおいても振動系重量増加を少なく抑えることができ、振動系重量増加に伴うスピーカの能率低下を低く抑えることができる。
【００６１】
（実施の形態１４）
次に図１６について説明する。図１６は実施の形態１４の断面図を示し、図１６においては、サスペンションホルダ２０をパルプで形成した構成としている。
【００６２】
このため、弾性率と内部損失を確保した上で振動系の重量増加を少なく抑えることができ、振動系の重量増加に伴う、このスピーカの能率低下を抑えることができる。
【００６３】
（実施の形態１５）
次に図１７について説明する。図１７は実施の形態１５の断面図を示し、実施の形態１〜１４と同じ構成のものに関しては同一の符号を付している。図１７においては、サスペンションホルダ２０はその外周端をフレーム１９内周端よりも磁気回路９側にして第２のエッジ２１を介してフレーム１９に連結した構成としている。
【００６４】
このため、第１のエッジ１８と第２のエッジ２１の支点間距離を可能な限り大きくとることができ、ボイスコイル体１５が可動時にローリングすることを最大限に防止することができる。
【００６５】
（実施の形態１６）
次に図１８について説明する。図１８は実施の形態１６の断面図を示し、実施の形態１〜１５と同じ構成のものに関しては同一の符号を付している。図１８においては、ボイスコイル体１５とフレーム１９の間に防塵ネット３１を取り付けた構成としている。
【００６６】
このため、磁気回路９の磁気ギャップ１４内へ塵などが入るのを未然に防止することができる。
【００６７】
（実施の形態１７）
次に図１９について説明する。図１９は実施の形態１７のスピーカを背面から見た図を示し、実施の形態１〜１６と同じ構成のものに関しては同一の符号を付している。図１９において、フレーム１９の内端は磁気回路９に連結し、このフレーム１９の内端側（底面側）に通気口３２を設け、この通気口３２部分に防塵ネット３３を設けた構成としている。
【００６８】
このため、磁気回路９の磁気ギャップ１４内へ塵などが入るのを未然に防止することができる。
【００６９】
（実施の形態１８）
次に図２０について説明する。図２０は、実施の形態１８のスピーカの一部切欠正面図を示し、実施の形態１と同じ構成のものに関しては同一の符号を付している。図２０においてはサスペンションホルダ２０に開口部３４を設けた構成としている。
【００７０】
このため、サスペンションホルダ２０の音響出力が振動板１７に干渉してスピーカの音響特性が劣化するのを抑えることができる。
【００７１】
（実施の形態１９）
次に図２１について説明する。図２１は、本発明の実施の形態１９の一部切欠正面図を示し、実施の形態１〜１８と同じ構成のものに関しては同一の符号を付している。図２１においては、フレーム１９の第１のエッジ１８、第２のエッジ２１間部分に開口部３５を設けた構成としている。このため、振動板１７と、第１のエッジ１８、フレーム１９、第２のエッジ２１、サスペンションホルダ２０、ボイスコイル体１５で中間チャンバが形成されるのを防止することができる。つまりこの中間チャンバ形成によりサスペンションホルダ２０の音響出力が振動板１７に干渉してスピーカの音響特性が劣化するのを抑えることができるのである。
【００７２】
（実施の形態２０）
最後に図２２について説明する。図２２は実施の形態２０の断面図を示し、実施の形態１〜１９と同じ構成にものに関しては同一の符号を付している。図２２において、３６は、本発明の実施の形態１〜１９のスピーカを取り付ける比較的容積の小さい密閉箱で、第１のエッジ１９より第２のエッジ２１の弾性率を大きく設定した構成としている。このため、比較的容積の小さい密閉箱３６に入れて使用する場合でも空気バネと前記第１のエッジ１８及び前記第２のエッジ２１でサスペンション特性を合わせ込み、非直線性及び非対称性を正確にキャンセルすることができ、スピーカの高調波ひずみ低減とパワーリニアリティを向上させることができる。
【００７３】
【発明の効果】
以上のように本発明によれば、スピーカにおいて、サスペンションホルダの中部から第２のエッジの間の部分を外周方向へ湾曲させることによりこの連結部分にかかる応力をサスペンションホルダ全体に分散させることができる。これによってスピーカの高調波ひずみを低減させることができ、パワーリニアリティをも向上させてスピーカの高性能化を図ることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１のスピーカの断面図
【図２】本発明の実施の形態１のスピーカのパワーリニアリティを示す特性図
【図３】本発明の実施の形態１のスピーカの高調波ひずみ特性を示す特性図
【図４】本発明の実施の形態２のスピーカの断面図
【図５】本発明の実施の形態３のスピーカの断面図
【図６】（ａ）、（ｂ）はそれぞれ本発明の実施の形態４のスピーカの断面図
【図７】本発明の実施の形態５のスピーカの要部拡大断面図
【図８】本発明の実施の形態６のスピーカの要部拡大断面図
【図９】本発明の実施の形態７のスピーカの要部拡大断面図
【図１０】本発明の実施の形態８のスピーカの断面図
【図１１】本発明の実施の形態９のスピーカの断面図
【図１２】本発明の実施の形態１０のスピーカの断面図
【図１３】本発明の実施の形態１１のスピーカの断面図
【図１４】本発明の実施の形態１２のスピーカの断面図
【図１５】本発明の実施の形態１３のスピーカの断面図
【図１６】本発明の実施の形態１４のスピーカの断面図
【図１７】本発明の実施の形態１５のスピーカの断面図
【図１８】本発明の実施の形態１６のスピーカの断面図
【図１９】本発明の実施の形態１７のスピーカの背面図
【図２０】本発明の実施の形態１８のスピーカの一部切欠正面図
【図２１】本発明の実施の形態１９のスピーカの一部切欠正面図
【図２２】本発明の実施の形態２０のスピーカの断面図
【図２３】従来のスピーカの断面図
【図２４】従来のスピーカのパワーリニアリティを示す特性図
【図２５】従来のスピーカの高調波ひずみ特性を示す特性図
【符号の説明】
９磁気回路
１０マグネット
１１プレート
１２ヨーク
１３ポール
１４磁気ギャップ
１５ボイスコイル体
１６コイル部
１７，２６振動板
１８，２９第１のエッジ
１９フレーム
２０サスペンションホルダ
２１，３０第２のエッジ
３１，３３防塵ネット
３２通気口
３４，３５開口部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker.
[0002]
[Prior art]
A conventional speaker has a configuration as shown in FIG.
[0003]
That is, as shown in FIG. 23, this speaker includes a magnetic circuit 1, a voice coil body 4 in which at least a coil portion 3 thereof is movably provided in a magnetic gap 2 of the magnetic circuit 1, and the voice coil. The outer periphery of the magnetic gap 2 of the body 4 is provided with a diaphragm 5 whose inner periphery is connected, and a frame 7 whose outer periphery is connected via an edge 6.
[0004]
That is, by inputting an electrical signal output from an audio amplifier or the like to the voice coil section 3 of the voice coil body 4, the voice coil body 4 is vibrated, and the vibration force is transmitted to the diaphragm 5, whereby the diaphragm 5 is configured to vibrate air and convert an electrical signal into sound.
[0005]
[Problems to be solved by the invention]
In the above conventional example, as shown in FIG. 23, the inner periphery of the damper 8 is fixed between the voice coil portion 3 of the voice coil body 4 and the inner periphery fixing portion of the diaphragm 5, and the outer periphery of the damper 8 is a frame. 7 is fixed. The damper 8 forms a suspension together with the edge 6 so that the voice coil body 4 does not roll when it is movable. Further, the damper 8 has a configuration in which a plurality of waveforms are combined as shown in FIG. 23 so that the movable load of the voice coil body 4 is not as much as possible.
[0006]
However, in the recent high performance of speakers, the presence of this damper 8 causes a big problem.
[0007]
That is, the non-linearity and asymmetry of the movable load of the damper 8 are large in the behavior of the voice coil body 4 toward the magnetic circuit 1 and the behavior toward the opposite side of the magnetic circuit 1, and the harmonic distortion due to this is large. At the same time it occurred, the power linearity was also going to deteriorate.
[0008]
FIG. 24 shows the displacement of the diaphragm 5 with respect to the power linearity of the conventional speaker and the speaker input power. A shows the amplitude characteristic of the diaphragm 5 toward the magnetic circuit 1, and B shows the amplitude characteristic of the diaphragm 5 in the direction opposite to the magnetic circuit 1. FIG. 25 shows the harmonic distortion characteristics of a conventional speaker, where C is the frequency characteristic of the speaker, D is the second harmonic distortion characteristic, and E is the third harmonic distortion characteristic.
[0009]
In order to solve such problems of power linearity deterioration and harmonic distortion characteristics due to such non-linearity and asymmetry, each company has devised various ways to solve the non-linearity and asymmetry of the damper 8. However, as described above, the damper 8 is formed by combining a plurality of waveforms so as to reduce the movable load. Therefore, as long as the suspension is configured by combining the damper 8 and the edge 6, nonlinearity is achieved. It is difficult to reduce the harmonic distortion by solving the asymmetry and the present situation is that the performance of the speaker has not been improved. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the performance of a speaker.
[0010]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 of the present invention includes a magnetic circuit having a magnetic gap, and a voice having at least a coil portion movably provided in the magnetic gap of the magnetic circuit. A coil body, a diaphragm having an inner periphery coupled to an outer portion of the magnetic gap of the voice coil body, and a frame having an outer periphery coupled to the diaphragm via a first edge; The inner periphery of the suspension holder is connected to the magnetic circuit side from the diaphragm of the coil body, and the outer peripheral portion of the suspension holder is connected to the frame via a second edge. These first and second edges are And a substantially symmetrical similar shape between the first and second edges, and the diaphragm and the suspension holder are coupled to each other between the suspension and the suspension. From Chubu Yonhoruda it is obtained by bending a portion between the second edge toward the outer circumference. In other words, by configuring the suspension with the first edge and the second edge, the damper that causes the nonlinearity and asymmetry of the suspension is eliminated, and the first edge and the second edge have their own asymmetry. Since the suspension is arranged so as to cancel the suspension, the nonlinearity and asymmetry of the suspension can be fundamentally solved, and the performance of the speaker is improved by reducing the harmonic distortion and power linearity of the speaker due to this. Can be made. Further, by coupling the diaphragm and the suspension holder at their middle portions, both phases can be matched, and the frequency characteristics of the mid-low range resulting from this can be flattened.
[0011]
Further, the resonance frequency can be dispersed by bending the suspension holder outward.
[0012]
Next, an invention according to claim 19 of the present invention provides a magnetic circuit having a magnetic gap, a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit, and the voice coil. A suspension holder having an inner peripheral portion connected to an outer portion of the magnetic gap of the body, a frame having an outer peripheral portion of the suspension holder connected through a second edge, and an inner periphery in the middle of the suspension holder. The outer periphery includes a diaphragm connected to the frame via a first edge, and the first and second edges are substantially symmetrically similar to each other with the first and second edges as a boundary. And a portion between the middle portion of the suspension holder and the second edge is curved in the outer circumferential direction.
[0013]
In other words, by configuring the suspension with the first edge and the second edge, the damper that causes the nonlinearity and asymmetry of the suspension is eliminated, and the first edge and the second edge have their own asymmetry. By arranging to cancel the suspension, the nonlinearity and asymmetry of the suspension can be fundamentally solved, and the speaker's performance is improved by reducing the harmonic distortion and power linearity of the speaker caused by this. Can be made. In addition, since the inner periphery of the diaphragm is connected to the middle part of the suspension holder, the input resistance can be improved by increasing the amplitude stroke of the suspension holder and the magnetic circuit.
[0014]
Next, the invention according to claim 37 of the present invention provides a magnetic circuit having a magnetic gap, a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit, and the voice coil. A diaphragm having an inner periphery coupled to an outer portion of the magnetic gap of the body, and a frame having an outer periphery coupled to the diaphragm via a first edge. The inner periphery is connected, and the outer periphery of the suspension holder is connected to the frame via a second edge, and the first and second edges are substantially symmetrical with respect to the boundary between the first and second edges. The shape is similar, and a portion between the middle portion of the suspension holder and the second edge is curved in the outer circumferential direction. In other words, by configuring the suspension with the first edge and the second edge, the damper that causes the nonlinearity and asymmetry of the suspension is eliminated, and the first edge and the second edge have their own asymmetry. Therefore, it is possible to fundamentally solve the non-linearity and asymmetry of the suspension, thereby reducing the harmonic distortion of the speaker and improving the power linearity of the speaker. Performance can be improved. Further, by connecting the inner periphery of the suspension holder to the middle part of the diaphragm, the acoustic conversion efficiency can be increased by reducing the weight of the vibration system.
[0015]
Next, an invention according to claim 55 of the present invention provides a magnetic circuit having a magnetic gap, a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit, and the voice coil. A diaphragm having an inner periphery coupled to an outer portion of the magnetic gap of the body, and a frame having an outer periphery coupled to the diaphragm via a first edge; The inner periphery of the suspension holder is connected to the magnetic circuit side, the outer periphery of the suspension holder is connected to the frame via a second edge, and the portion between the second and the edge from the middle of the suspension holder is connected to the outer periphery. Curved in the direction. Since these first and second edges are related to cancel each nonlinearity, a damper that causes the nonlinearity and asymmetry of the suspension is eliminated, and the first edge is eliminated. The second edge cancels its own asymmetry, so that the suspension nonlinearity and asymmetry can be fundamentally solved, resulting in reduction of speaker harmonic distortion and power linearity. Can improve the performance of the speaker.
[0016]
Next, in the invention described in claims 2, 20 and 38 of the present invention, the outer peripheral portion of the suspension holder is connected to the frame via the second edge, and the second edge and the outer peripheral portion of the suspension holder are Since the connection is made at the flat overlapping portion, the stress applied to the connection portion can be dispersed in the suspension holder, so that the input resistance performance of the speaker can be further improved.
[0017]
Next, according to the invention described in claims 3, 21 and 39 of the present invention, the suspension holder and the second edge are formed in an L shape in the outer peripheral portion of the suspension holder, and are connected by a plane overlapping portion. Since the effect of dispersing the stress applied to the connection portion between the holder and the second edge is increased, the input resistance performance of the speaker can be further improved.
[0018]
Next, the invention described in claims 4, 22, and 40 of the present invention is an extension of the suspension holder while bending the tip of the outer peripheral portion thereof, thereby making it more than the invention described in claims 3, 21, and 39. Since the effect of dispersing the stress applied to the connecting portion is further increased, the input resistance performance of the speaker can be further improved.
[0019]
Next, the invention according to claims 5, 23, and 41 of the present invention is the one in which the tip of the outer peripheral portion of the diaphragm is extended while being bent, whereby the stress applied to the connecting portion of the diaphragm and the first edge. Therefore, the input resistance performance of the speaker can be further improved.
[0020]
Next, in the inventions according to claims 6, 24, and 42 of the present invention, the corrugation is provided on the diaphragm, and thereby the rigidity of the diaphragm is improved, so that the input resistance performance of the speaker is further improved. Can do.
[0021]
Next, the invention described in claims 7, 25 and 43 of the present invention is that the bobbin of the voice coil body and the suspension holder are formed of a metal material, and the heat generation of the voice coil body is reduced by the bobbin and the suspension holder. Thus, heat can be efficiently radiated to the space, and the input resistance performance of the speaker can be improved.
[0022]
Next, in the invention described in claims 8, 26 and 44 of the present invention, the first edge has a shape protruding in the opposite direction to the magnetic circuit, and the second edge has a shape protruding toward the magnetic circuit. Even when the positional relationship between the first edge and the second edge is close, the movable contact between the first edge and the second edge can be avoided, and the speaker The maximum sound pressure can be increased by increasing the amplitude margin.
[0023]
Next, in the invention described in claims 9, 27 and 45 of the present invention, the first edge has a shape projecting toward the magnetic circuit, and the second edge has a shape projecting toward the diaphragm. In addition, even when an acoustic opening such as a net is close to the front of the first edge, the contact between the first edge and the acoustic net can be avoided, and the amplitude margin of the speaker is increased. The maximum sound pressure can be increased.
[0024]
Next, in the invention described in claims 10, 28 and 46 of the present invention, the elastic modulus of the first edge and the second edge are set substantially equal, and the first edge and the second edge are set. The edge of the can accurately cancel its own non-linearity, can greatly improve the asymmetry of the suspension, which can reduce the harmonic distortion and improve the power linearity of the speaker device it can.
[0025]
Next, according to the eleventh, twenty-seventh and 47th aspects of the present invention, the first edge and the second edge are made of urethane, and the speaker according to the present invention has the first and second edges. In this case, the increase in the vibration system weight can be suppressed to a small level, and the decrease in the efficiency of the speaker accompanying the increase in the vibration system weight can be suppressed.
[0026]
Next, in the inventions according to claims 12, 30, and 48 of the present invention, the suspension holder is made of pulp, and even in the speaker of the present invention having the suspension holder, an increase in vibration system weight can be suppressed to a small extent. Moreover, the efficiency reduction of the speaker accompanying the increase in the vibration system weight can be suppressed.
[0027]
Next, the invention according to claims 13, 31, 49 of the present invention is such that the outer peripheral side of the suspension holder is connected to the frame via the second edge on the magnetic circuit side from the inner end of the frame. The distance between the fulcrum points of the first edge and the second edge can be increased, and the voice coil body can be prevented from rolling when it is movable without a damper.
[0028]
Next, the invention according to claims 14, 32 and 50 of the present invention is such that a dust-proof net is attached between the suspension holder and the magnetic circuit, and it is possible to prevent dust from entering the magnetic gap of the magnetic circuit. The voice coil body can be moved smoothly.
[0029]
Next, in the invention described in claims 15, 33 and 51 of the present invention, the inner end of the frame is connected to a magnetic circuit, a vent is provided on the inner end side of the frame, and a dust-proof net is provided at the vent. Thus, dust and the like can be prevented from entering the magnetic gap of the magnetic circuit, and the voice coil body can be moved smoothly.
[0030]
Next, the invention according to claims 16, 34 and 52 of the present invention is such that the suspension holder is provided with an opening, and the acoustic output from the suspension holder can be kept low, and the acoustic output of the suspension holder is reduced. It can suppress that the acoustic characteristic of a speaker deteriorates by interfering with a diaphragm.
[0031]
Next, the invention according to claim 17, 35, 53 of the present invention is such that an opening is provided in a portion between the first and second edges of the frame, and the diaphragm, the first edge, and the frame The intermediate chamber is prevented from being formed by the second edge, the suspension holder, and the voice coil body, and the acoustic output of the suspension holder interferes with the diaphragm due to the formation of the intermediate chamber, thereby deteriorating the acoustic characteristics of the speaker. Can be suppressed.
[0032]
Next, in the invention described in claims 18, 36 and 54 of the present invention, the elastic modulus of the second edge is set to be larger than that of the first edge when the speaker is put in a sealed box having a relatively small volume. Even if the first edge and the second edge are used in a sealed box having a relatively small volume, the nonlinearity of the first edge and the second edge can be canceled accurately, and the suspension is asymmetric. Therefore, the harmonic distortion can be reduced and the power linearity of the speaker device can be improved.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0034]
(Embodiment 1)
FIG. 1 shows a cross-sectional view of a speaker according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 9 denotes a magnet by a ring-shaped magnet 10, a ring-shaped plate 11, a disk-shaped yoke 12, and a columnar pole 13. The magnetic flux of the magnet 10 is concentrated in the magnetic gap 14 between the inner periphery of the plate 11 and the outer periphery of the pole 13. Ferrite and rare earth cobalt are used for the magnet 10, and iron is mainly used for the plate 11, the yoke 12 and the pole 13. Although FIG. 1 shows an example of an outer magnet type, an inner magnet type magnetic circuit is also widely used. Reference numeral 15 denotes a cylindrical voice coil body in which at least the coil portion 16 is movably provided in the magnetic gap 14 of the magnetic circuit 9. Generally, a bobbin made of a metal such as paper, resin, aluminum or the like is used. A coil such as a copper wire is wound on the top.
[0035]
Reference numeral 17 denotes an inverted conical diaphragm whose inner periphery is connected to the outer part of the magnetic gap of the voice coil body 15, which actually emits sound due to the vibration generated by the voice coil body 15. Pulp and resin having both rigidity and internal loss are mainly used. Reference numeral 18 denotes a ring-shaped first edge coupled to the outer periphery of the diaphragm 17, and materials such as urethane, rubber, and cloth are used so as not to apply a movable load to the diaphragm 17. Reference numeral 19 denotes a dish-like frame in which the outer periphery of the diaphragm 17 is connected via a first edge 18, and a material such as an iron plate press product, a resin molded product, and an aluminum die cast is used so as to cope with a complicated shape. Used.
[0036]
Reference numeral 20 denotes a suspension holder in which the inner periphery is connected to the magnetic circuit 9 side of the diaphragm 17 of the voice coil body 15, and pulp and resin having both high rigidity and internal loss are mainly used. Reference numeral 21 denotes a second edge for coupling the outer periphery of the suspension holder 20 to the frame 19. Like the first edge 18, materials such as urethane, rubber, and cloth are used so as not to apply a movable load to the suspension holder 20. . Here, in order to disperse the stress applied to the connection portion with the second edge 21, the suspension holder 20 curves the portion between the middle portion and the connection portion with the second edge 21 in the outer peripheral direction. The first edge 18 protrudes in the opposite direction to the magnetic circuit 9 and the second edge 21 protrudes toward the magnetic circuit 9, but is substantially symmetrical with respect to the boundary between the first and second edges 18 and 21. It has a similar shape.
[0037]
FIG. 2 shows the power linearity of the speaker according to the first embodiment of the present invention, and shows the amplitude of the diaphragm 17 with respect to the input power. A is the input power to the magnetic circuit 9 side-diaphragm amplitude characteristics. B is the input power-diaphragm amplitude characteristic to the side opposite to the magnetic circuit 9.
[0038]
FIG. 3 shows the harmonic distortion characteristics of the loudspeaker according to Embodiment 1 of the present invention. The larger the dynamic range of the output sound pressure and the harmonic distortion, the smaller the harmonic distortion. C is a speaker characteristic, D is a second harmonic distortion characteristic, and E is a third harmonic distortion characteristic.
[0039]
The operation of the loudspeaker according to Embodiment 1 configured as described above will be described below.
[0040]
By inputting an electrical signal output from an audio amplifier or the like to the coil portion 16 of the voice coil body 15, the voice coil body 15 is vibrated, the vibration force is transmitted to the diaphragm 17, and the diaphragm 17 is air. Is oscillated to convert the electrical signal into sound.
[0041]
Further, a suspension by a suspension holder 20 and a second edge 21 is provided between the voice coil body 15 and the frame 19 in place of the conventional damper. The suspension holder 20 and the second edge 21 constitute a suspension together with the first edge 18 and are provided so as not to roll when the voice coil body 15 is movable.
[0042]
For this reason, a suspension can be comprised by the 1st edge 18 and the 2nd edge 21, and the damper used as the factor of the nonlinearity and asymmetry of a suspension can be excluded. Further, the first edge 18 and the second edge 21 have substantially symmetric similar shapes so as to cancel their own asymmetry. Specifically, the first edge 18 and the second edge 21 are opposed to each other so that the protruding directions are opposite to each other, whereby the power linearity input power-diaphragm amplitude shown by A and B in FIG. As the characteristics, the nonlinearity and asymmetry of the suspension can be fundamentally solved.
[0043]
Therefore, like the harmonic distortion characteristics of the loudspeaker indicated by D and E in FIG. 3, the harmonic distortion caused by the nonlinearity and asymmetry of the suspension can be reduced, and the performance of the loudspeaker can be improved.
[0044]
(Embodiment 2)
Next, FIG. 4 will be described. FIG. 4 shows a cross-sectional view of the second embodiment of the present invention, and components having the same configuration as those of the first embodiment are denoted by the same reference numerals. In FIG. 4, reference numeral 26 denotes an inverted frustoconical diaphragm whose inner periphery is connected to an intermediate portion between the inner periphery and the outer periphery of the suspension holder 25, and the outer periphery thereof is connected to a frame 19 via a first edge 18. It is connected to. Here, in order to disperse the stress applied to the connection portion with the second edge 21, the suspension holder 25 bends the portion between the middle portion and the connection portion with the second edge 21 in the outer peripheral direction. For this reason, the diaphragm 26 can be significantly reduced in weight, and the acoustic conversion efficiency of the speaker itself can be improved.
[0045]
(Embodiment 3)
Next, FIG. 5 will be described. FIG. 5 shows a cross-sectional view of the third embodiment, and components having the same configurations as those of the first and second embodiments are denoted by the same reference numerals. In FIG. 5, reference numeral 27 denotes a frustoconical suspension holder in which the inner periphery is connected to the middle portion between the inner periphery and the outer periphery of the diaphragm 17. It is connected. Here, in order to disperse the stress applied to the connection portion with the second edge 21, the suspension holder 27 curves the portion between the middle portion and the connection portion with the second edge 21 in the outer peripheral direction. For this reason, the suspension holder 27 can be significantly reduced in weight, and the sound conversion efficiency of the speaker itself can be improved.
[0046]
(Embodiment 4)
Next, FIG. 6 will be described. FIG. 6A is a cross-sectional view of the fourth embodiment, and FIG. 6B is an enlarged view of a connecting portion between the second edge 21 and the suspension holder 20. The same components as those in the first to third embodiments are denoted by the same reference numerals. In FIG. 6, the suspension holder 20 is curved in the outer peripheral direction at a portion between the middle portion and the connecting portion with the second edge 21. Furthermore, since the second edge 21 and the outer peripheral portion of the suspension holder 20 are connected by the planar overlapping portion 20A, the stress applied to the connecting portion can be dispersed, so that the input resistance performance of the speaker can be further improved. it can.
[0047]
(Embodiment 5)
Next, FIG. 7 will be described. FIG. 7 shows an enlarged cross-sectional view of a main part of the fifth embodiment. In FIG. 7, the suspension holder 20 is curved in the outer peripheral direction at a portion between the middle portion and the connecting portion with the second edge 21. Further, in the outer peripheral portion of the suspension holder 20, the suspension holder 20 and the second edge 21 are connected in an L shape by a planar overlapping portion 20A. As a result, the effect of dispersing the stress applied to the connection portion between the suspension holder 25 and the second edge 21 is increased, so that the input resistance performance of the speaker can be further improved.
[0048]
(Embodiment 6)
Next, FIG. 8 will be described. FIG. 8 shows an enlarged cross-sectional view of the main part of the sixth embodiment. In FIG. 8, the suspension holder 20 is extended while bending the tip of the outer peripheral portion. As a result, the effect of dispersing the stress applied to the connection portion between the suspension holder 20 and the second edge 21 is further increased, so that the input resistance performance of the speaker can be further improved.
[0049]
(Embodiment 7)
Next, FIG. 9 will be described. FIG. 9 shows an enlarged cross-sectional view of the main part of the seventh embodiment. In FIG. 9, the diaphragm 17 is extended while bending the tip of the outer peripheral portion. Thereby, since the connection part of the diaphragm 17 and the 1st edge 18 is strengthened and the stress concerning this connection part can be disperse | distributed, the input-proof performance of a speaker can be improved more.
[0050]
(Embodiment 8)
Next, FIG. 10 will be described. FIG. 10 shows a cross-sectional view of the eighth embodiment, and the same reference numerals are attached to the same components as those of the first to seventh embodiments. In FIG. 10, corrugation is provided in a portion between the middle portion of the diaphragm 17 and the first edge 18. Thereby, since the rigidity of the diaphragm 17 is improved, the input resistance performance of the speaker can be further improved.
[0051]
(Embodiment 9)
Next, FIG. 11 will be described. FIG. 11 shows a cross-sectional view of the ninth embodiment, and components having the same configurations as those of the first to eighth embodiments are denoted by the same reference numerals. In FIG. 11, the suspension holder 20 is made of a metal material having high thermal conductivity together with the bobbin of the voice coil body 15.
[0052]
Therefore, the heat generated by the voice coil body 15 can be efficiently radiated to the space via the bobbin of the voice coil body 15 and the suspension holder 20, and the temperature rise of the voice coil body 15 can be suppressed. For this reason, the adhesive strength of the voice coil body 15, the diaphragm 17, and the suspension holder 20 can be sufficiently ensured even with an adhesive whose adhesive strength is reduced at high temperatures, thereby improving the input resistance performance of the speaker. be able to.
[0053]
(Embodiment 10)
Next, FIG. 12 will be described. FIG. 12 shows a cross-sectional view of the tenth embodiment, and components having the same configurations as those of the first to ninth embodiments are denoted by the same reference numerals. In FIG. 12, the first edge 18 has a shape protruding in the opposite direction to the magnetic circuit 9, and the second edge 21 has a shape protruding toward the magnetic circuit 9.
[0054]
For this reason, even when the positional relationship between the first edge 18 and the second edge 21 is close, the movable contact between the first edge 18 and the second edge 21 can be avoided. The maximum sound pressure can be increased by increasing the margin.
[0055]
(Embodiment 11)
Next, FIG. 13 will be described. FIG. 13 shows a cross-sectional view of the eleventh embodiment, and components having the same configurations as those of the first to tenth embodiments are given the same reference numerals. In FIG. 13, the first edge 18 has a shape protruding toward the magnetic circuit 9, and the second edge 21 has a shape protruding toward the diaphragm 17.
[0056]
For this reason, even when an acoustic opening such as a net is close to the front of the first edge 18, contact between the first edge 18 and the acoustic net can be avoided, so that an amplitude margin of the speaker is increased. The maximum sound pressure can be increased.
[0057]
(Embodiment 12)
Next, FIG. 14 will be described. FIG. 14 shows a cross-sectional view of the twelfth embodiment. In FIG. 14, the elastic moduli of the first edge 18 and the second edge 21 are set substantially equal.
[0058]
For this reason, the first edge 18 and the second edge 21 can accurately cancel the nonlinearity and asymmetry of the first edge 18 and the second edge 21, and can greatly solve the nonlinearity and asymmetry of the suspension. The harmonic distortion and power linearity of the speaker device resulting from this can be greatly reduced.
[0059]
(Embodiment 13)
Next, FIG. 15 will be described. FIG. 15 shows a sectional view of the thirteenth embodiment. In FIG. 15, the first edge 18 and the second edge 21 are made of urethane.
[0060]
For this reason, also in the speaker according to the thirteenth embodiment of the present invention having the first and second edges 18 and 21, the increase in the vibration system weight can be suppressed to a small level, and the efficiency reduction of the speaker due to the increase in the vibration system weight is suppressed to a low level. be able to.
[0061]
(Embodiment 14)
Next, FIG. 16 will be described. FIG. 16 shows a cross-sectional view of the fourteenth embodiment. In FIG. 16, the suspension holder 20 is made of pulp.
[0062]
For this reason, it is possible to suppress the increase in the weight of the vibration system while securing the elastic modulus and the internal loss, and it is possible to suppress the decrease in the efficiency of the speaker accompanying the increase in the weight of the vibration system.
[0063]
(Embodiment 15)
Next, FIG. 17 will be described. FIG. 17 shows a cross-sectional view of the fifteenth embodiment, and components having the same configuration as those of the first to fourteenth embodiments are given the same reference numerals. In FIG. 17, the suspension holder 20 is configured to be connected to the frame 19 via the second edge 21 with the outer peripheral end thereof being closer to the magnetic circuit 9 side than the inner peripheral end of the frame 19.
[0064]
For this reason, the distance between the fulcrums of the first edge 18 and the second edge 21 can be made as large as possible, and the voice coil body 15 can be prevented from rolling when it is movable.
[0065]
(Embodiment 16)
Next, FIG. 18 will be described. FIG. 18 shows a cross-sectional view of the sixteenth embodiment, and components having the same configurations as those of the first to fifteenth embodiments are denoted by the same reference numerals. In FIG. 18, a dustproof net 31 is attached between the voice coil body 15 and the frame 19.
[0066]
For this reason, it is possible to prevent dust and the like from entering the magnetic gap 14 of the magnetic circuit 9.
[0067]
(Embodiment 17)
Next, FIG. 19 will be described. FIG. 19 shows a view of the speaker according to the seventeenth embodiment as viewed from the back side, and components having the same configurations as those of the first to sixteenth embodiments are denoted by the same reference numerals. In FIG. 19, the inner end of the frame 19 is connected to the magnetic circuit 9, a vent hole 32 is provided on the inner end side (bottom surface side) of the frame 19, and a dustproof net 33 is provided at the vent 32 portion. .
[0068]
For this reason, it is possible to prevent dust and the like from entering the magnetic gap 14 of the magnetic circuit 9.
[0069]
(Embodiment 18)
Next, FIG. 20 will be described. FIG. 20 shows a partially cutaway front view of the loudspeaker according to the eighteenth embodiment. Components having the same configuration as those of the first embodiment are denoted by the same reference numerals. In FIG. 20, the suspension holder 20 is provided with an opening 34.
[0070]
For this reason, it can suppress that the acoustic output of the suspension holder 20 interferes with the diaphragm 17, and the acoustic characteristic of a speaker deteriorates.
[0071]
(Embodiment 19)
Next, FIG. 21 will be described. FIG. 21 is a partially cutaway front view of the nineteenth embodiment of the present invention, and the same reference numerals are given to the same components as those of the first to eighteenth embodiments. In FIG. 21, an opening 35 is provided in the portion between the first edge 18 and the second edge 21 of the frame 19. Therefore, it is possible to prevent the intermediate chamber from being formed by the diaphragm 17, the first edge 18, the frame 19, the second edge 21, the suspension holder 20, and the voice coil body 15. That is, by forming the intermediate chamber, it is possible to prevent the acoustic output of the suspension holder 20 from interfering with the diaphragm 17 to deteriorate the acoustic characteristics of the speaker.
[0072]
(Embodiment 20)
Finally, FIG. 22 will be described. FIG. 22 shows a sectional view of the twentieth embodiment, and the same reference numerals are given to the same components as those of the first to nineteenth embodiments. In FIG. 22, reference numeral 36 denotes a sealed box with a relatively small volume to which the speakers according to Embodiments 1 to 19 of the present invention are attached. The elastic modulus of the second edge 21 is set larger than that of the first edge 19. . Therefore, even when used in a sealed box 36 having a relatively small volume, the suspension characteristics are matched by the air spring and the first edge 18 and the second edge 21 so that nonlinearity and asymmetry can be accurately determined. It can be canceled, and the harmonic distortion reduction and power linearity of the speaker can be improved.
[0073]
【The invention's effect】
As described above, according to the present invention, in the speaker, the portion of the suspension holder between the second portion and the second edge is curved in the outer peripheral direction, so that the stress applied to the connecting portion can be dispersed throughout the suspension holder. . As a result, the harmonic distortion of the speaker can be reduced, the power linearity can be improved, and the performance of the speaker can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a speaker according to a first embodiment of the present invention.
FIG. 2 is a characteristic diagram showing power linearity of the speaker according to the first embodiment of the present invention.
FIG. 3 is a characteristic diagram showing harmonic distortion characteristics of the speaker according to Embodiment 1 of the present invention.
FIG. 4 is a cross-sectional view of a speaker according to a second embodiment of the present invention.
FIG. 5 is a sectional view of a speaker according to a third embodiment of the present invention.
FIGS. 6A and 6B are cross-sectional views of a speaker according to Embodiment 4 of the present invention.
FIG. 7 is an enlarged sectional view of a main part of a speaker according to a fifth embodiment of the present invention.
FIG. 8 is an enlarged sectional view of a main part of a speaker according to a sixth embodiment of the present invention.
FIG. 9 is an enlarged sectional view of a main part of a speaker according to a seventh embodiment of the present invention.
FIG. 10 is a sectional view of a speaker according to an eighth embodiment of the present invention.
FIG. 11 is a sectional view of a speaker according to a ninth embodiment of the present invention.
FIG. 12 is a sectional view of a speaker according to a tenth embodiment of the present invention.
FIG. 13 is a sectional view of a speaker according to an eleventh embodiment of the present invention.
FIG. 14 is a sectional view of a speaker according to a twelfth embodiment of the present invention.
FIG. 15 is a sectional view of a speaker according to a thirteenth embodiment of the present invention.
FIG. 16 is a sectional view of a speaker according to a fourteenth embodiment of the present invention.
FIG. 17 is a sectional view of a speaker according to a fifteenth embodiment of the present invention.
FIG. 18 is a sectional view of a speaker according to a sixteenth embodiment of the present invention.
FIG. 19 is a rear view of the speaker according to the seventeenth embodiment of the present invention.
FIG. 20 is a partially cutaway front view of the speaker according to the eighteenth embodiment of the present invention.
FIG. 21 is a partially cutaway front view of the speaker according to the nineteenth embodiment of the present invention.
FIG. 22 is a sectional view of a speaker according to a twentieth embodiment of the present invention.
FIG. 23 is a sectional view of a conventional speaker.
FIG. 24 is a characteristic diagram showing power linearity of a conventional speaker.
FIG. 25 is a characteristic diagram showing harmonic distortion characteristics of a conventional speaker.
[Explanation of symbols]
9 Magnetic circuit
10 Magnet
11 plates
12 York
13 Paul
14 Magnetic gap
15 Voice coil body
16 Coil part
17, 26 Diaphragm
18, 29 first edge
19 frames
20 Suspension holder
21, 30 second edge
31, 33 Dust-proof net
32 Vent
34,35 opening

Claims

A magnetic circuit having a magnetic gap; a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit; and an inner peripheral portion of the voice coil body at an outer portion of the magnetic gap. A diaphragm connected to the outer peripheral portion of the diaphragm via a first edge; and an inner peripheral portion of the suspension holder on the magnetic circuit side of the diaphragm of the voice coil body. The suspension holder is connected to the frame via a second edge, and the first and second edges are substantially symmetrically similar to each other with the first and second edges as a boundary. The diaphragm and the suspension holder are coupled to each other at the middle part, and a portion between the second edge from the middle part of the suspension holder is formed. Speaker is curved in the circumferential direction.

The speaker according to claim 1, wherein an outer peripheral portion of the suspension holder is connected to the frame via a second edge, and the second edge and the outer peripheral portion of the suspension holder are connected by a planar overlapping portion.

The speaker according to claim 2, wherein the suspension holder and the second edge are connected to each other at an outer peripheral portion of the suspension holder by an L-shaped planar overlapping portion.

The speaker according to claim 3, wherein the speaker is extended while bending the tip of the outer peripheral portion of the suspension holder.

The speaker as described in any one of Claims 2-4 extended while bending the front-end | tip of the outer peripheral part of a diaphragm.

The speaker as described in any one of Claims 2-4 which provided the corrugation in the diaphragm.

The speaker according to claim 1, wherein the bobbin and the suspension holder of the voice coil body are made of a metal material.

The speaker according to claim 1, wherein the first edge has a shape protruding in a direction opposite to the magnetic circuit, and the second edge has a shape protruding toward the magnetic circuit.

The speaker according to claim 1, wherein the first edge has a shape protruding toward the magnetic circuit, and the second edge has a shape protruding toward the diaphragm.

The speaker according to claim 8 or 9, wherein the elastic modulus of the first edge and the second edge are set to be substantially equal.

The speaker according to claim 10, wherein the first edge and the second edge are made of urethane.

The speaker according to claim 11, wherein the suspension holder is made of pulp.

The speaker according to any one of claims 8 to 10, wherein the outer peripheral side of the suspension holder is connected to the frame via a second edge on the magnetic circuit side from the inner end of the frame.

The speaker according to any one of claims 8 to 10, wherein a dustproof net is attached between the suspension holder and the magnetic circuit.

The speaker according to any one of claims 8 to 10, wherein an inner end of the frame is connected to a magnetic circuit, a vent is provided on the inner end side of the frame, and a dust-proof net is provided in the vent portion.

The speaker as described in any one of Claims 8-10 which provided the opening part in the suspension holder.

The speaker as described in any one of Claims 8-10 which provided the opening part in the part between the 1st, 2nd edges of a flame | frame.

The speaker according to any one of claims 2 to 9, wherein the side opposite to the diaphragm of the magnetic circuit is covered with a sealed box, and the elastic modulus of the second edge is set larger than that of the first edge.

A magnetic circuit having a magnetic gap; a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit; and an inner peripheral portion of the voice coil body at an outer portion of the magnetic gap. The connected suspension holder, the outer peripheral part of the suspension holder is connected to the frame connected via the second edge, and the inner periphery is connected to the middle part of the suspension holder, and the outer periphery is connected to the intermediate part via the first edge. A diaphragm connected to a frame, wherein the first and second edges are substantially symmetrically shaped between the first and second edges, and the second edge extends from the middle of the suspension holder. The speaker which curved the part between between in the outer peripheral direction.

The speaker according to claim 19, wherein an outer peripheral portion of the suspension holder is connected to the frame through a second edge, and the second edge and the outer peripheral portion of the suspension holder are connected by a plane overlapping portion.

21. The loudspeaker according to claim 20, wherein the suspension holder and the second edge are formed in an L shape at the outer peripheral portion of the suspension holder and are connected by a planar overlapping portion.

The speaker according to claim 21, wherein the speaker is extended while bending the tip of the outer peripheral portion of the suspension holder.

The speaker as described in any one of Claims 20-22 extended while making the front-end | tip of the outer peripheral part of a diaphragm bend.

The speaker as described in any one of Claims 20-22 which provided the corrugation in the diaphragm.

The speaker according to claim 19, wherein the bobbin and the suspension holder of the voice coil body are made of a metal material.

The speaker according to claim 19, wherein the first edge has a shape protruding in a direction opposite to the magnetic circuit, and the second edge has a shape protruding toward the magnetic circuit.

The speaker according to claim 19, wherein the first edge has a shape protruding toward the magnetic circuit, and the second edge has a shape protruding toward the diaphragm.

28. The speaker according to claim 26 or 27, wherein the first edge and the second edge have substantially the same elastic modulus.

The speaker according to claim 28, wherein the first edge and the second edge are made of urethane.

The speaker according to claim 29, wherein the suspension holder is made of pulp.

The speaker according to any one of claims 26 to 28, wherein an outer peripheral side of the suspension holder is connected to the frame via a second edge closer to the magnetic circuit than the inner end of the frame.

The speaker according to any one of claims 26 to 28, wherein a dustproof net is attached between the suspension holder and the magnetic circuit.

The speaker according to any one of claims 26 to 28, wherein an inner end of the frame is connected to a magnetic circuit, a vent is provided on the inner end side of the frame, and a dustproof net is provided in the vent portion.

The speaker according to any one of claims 26 to 28, wherein an opening is provided in the suspension holder.

The speaker according to any one of claims 26 to 28, wherein an opening is provided in a portion between the first and second edges of the frame.

The speaker according to any one of claims 20 to 27, wherein the side opposite to the diaphragm of the magnetic circuit is covered with a sealed box, and the elastic modulus of the second edge is set larger than that of the first edge.

A magnetic circuit having a magnetic gap; a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit; and an inner peripheral portion of the voice coil body at an outer portion of the magnetic gap. A diaphragm connected to the outer periphery of the diaphragm via a first edge; and an inner periphery of the suspension holder is connected to a middle portion of the diaphragm. The first and second edges are substantially symmetrically shaped with the first and second edges as a boundary, and the second and second edges are formed from the middle of the suspension holder. A speaker in which a portion between edges is curved toward the outer periphery.

38. The speaker according to claim 37, wherein an outer peripheral portion of the suspension holder is connected to the frame via a second edge, and the second edge and the outer peripheral portion of the suspension holder are connected by a planar overlapping portion.

39. The speaker according to claim 38, wherein the suspension holder and the second edge are formed in an L shape at the outer peripheral portion of the suspension holder and are connected by a planar overlapping portion.

40. The speaker according to claim 39, wherein the speaker is extended while bending the tip of the outer peripheral portion of the suspension holder.

The speaker according to any one of claims 38 to 40, wherein the speaker is extended while being bent at the tip of the outer peripheral portion of the diaphragm.

The speaker according to any one of claims 38 to 40, wherein corrugation is provided on the diaphragm.

The speaker according to claim 37, wherein the bobbin of the voice coil body and the suspension holder are formed of a metal material.

The speaker according to claim 37, wherein the first edge has a shape protruding in a direction opposite to the magnetic circuit, and the second edge has a shape protruding toward the magnetic circuit.

The speaker according to claim 37, wherein the first edge has a shape protruding toward the magnetic circuit, and the second edge has a shape protruding toward the diaphragm.

46. The speaker according to claim 44 or 45, wherein the elastic moduli of the first edge and the second edge are set substantially equal.

The speaker according to claim 46, wherein the first edge and the second edge are made of urethane.

The speaker according to claim 47, wherein the suspension holder is made of pulp.

47. The speaker according to any one of claims 44 to 46, wherein an outer peripheral side of the suspension holder is connected to the frame via a second edge closer to the magnetic circuit than the inner end of the frame.

The speaker according to any one of claims 44 to 46, wherein a dustproof net is attached between the suspension holder and the magnetic circuit.

The speaker according to any one of claims 44 to 46, wherein an inner end of the frame is connected to a magnetic circuit, a vent is provided on the inner end side of the frame, and a dustproof net is provided at the vent portion.

The speaker according to any one of claims 44 to 46, wherein an opening is provided in the suspension holder.

The speaker according to any one of claims 44 to 46, wherein an opening is provided in a portion between the first and second edges of the frame.

The speaker according to any one of claims 38 to 45, wherein the opposite side of the magnetic circuit to the diaphragm is covered with a sealed box, and the elastic modulus of the second edge is set to be larger than that of the first edge.

A magnetic circuit having a magnetic gap; a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit; and an inner peripheral portion of the voice coil body at an outer portion of the magnetic gap. A diaphragm connected to the inner periphery of the suspension holder on the magnetic circuit side from the diaphragm of the voice coil body. The suspension holder is connected to the frame via a second edge, the first and second edges being related to cancel each nonlinearity, and the suspension holder A speaker in which a portion between a middle portion and the second edge is curved in an outer peripheral direction.