JP4219225B2

JP4219225B2 - Speaker device

Info

Publication number: JP4219225B2
Application number: JP2003192968A
Authority: JP
Inventors: 孝治前川
Original assignee: Tohoku Pioneer Corp; Pioneer Corp
Current assignee: Tohoku Pioneer Corp; Pioneer Corp
Priority date: 2003-05-30
Filing date: 2003-07-07
Publication date: 2009-02-04
Anticipated expiration: 2023-07-07
Also published as: EP2056623B1; CN1575040A; EP2056623A3; EP1482762A2; JP2005051283A; EP2056623A2; EP1482762A3

Description

【０００１】
【発明の属する技術分野】
本発明は、磁気回路中に配置するボイスコイルにより振動板を振動させて発音させるスピーカ装置に関する。
【０００２】
【従来技術】
従来、スピーカ装置として、内磁型と外磁型との２種類に大別できる（例えば、特許文献１参照）。この特許文献１にも記載のように、内磁型のスピーカ装置は、磁性材料にて略皿状に形成されたヨークと円板状のトッププレートとの間に磁石を配設している。そして、ヨークの周縁とトッププレートの周縁との間の磁気ギャップに、振動板の一面に一体に設けた円筒状のボイスコイルを軸方向に移動自在に配設している。一方、外磁型のスピーカ装置は、ヨークの略円筒状に形成されたセンターポールの軸方向の一端に外方に鍔状に突設した鍔部と、この鍔部に対応するリング状のトッププレートとの間にリング状の磁石を配設している。そして、ヨークのセンターポールの外周面とトッププレートの内周面との間の磁気ギャップに、振動板の一面に一体に設けた円筒状のボイスコイルを軸方向に移動可能に配設している。
【０００３】
【特許文献１】
特開昭５８−５３２９９号公報（第３頁左上欄−第４頁右下欄、図３および図６）
【０００４】
【発明が解決しようとする課題】
ところで、近年の携帯電話やＰＨＳ(Personal Handyphone System)、ＰＤＡ（Personal Digital Assistant）、ノート型パソコンなどの携帯型の電気機器が広く利用されており、スピーカの小型軽量化が臨まれている。
【０００５】
本発明は、上述したような実情などに鑑みて、薄型化が容易に図れるスピーカ装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
磁石本体と、前記磁石本体の一方の磁極が形成される外周面と磁気的に連結されるヨークと、振動部、エッジ部、およびこれらの振動部とエッジ部との間に配置される立上部を備えた振動板と、前記ヨークと磁気的に連結され、前記磁石本体と対向して配置される磁性体と、前記振動板の前記立上部に巻装されるボイスコイルと、を具備し、前記磁性体は、前記磁石本体の内側に配設される内筒部、前記磁石の外側に配設される外筒部、およびこれらの内筒部および外筒部の間に設けられて前記エッジ部を覆って配置される架橋部を備え、前記内筒部は、前記架橋部に連続して、前記立上部に沿って形成され、前記内筒部および前記磁石本体の間において磁気ギャップが形成され、前記振動板は、前記磁気ギャップ内において前記立上部が配置されるとともに、前記内筒部の内側に前記振動部が配置される状態に設けられたことを特徴とするスピーカ装置である。
【０００９】
【発明の実施の形態】
以下に、本発明のスピーカ装置の一実施の形態である第１の実施の形態を図面に基づいて説明する。なお、本実施の形態は、小型のスピーカ装置について例示するが、この限りではない。
【００１０】
〔第１の実施の形態〕
（スピーカ装置の構成）
図１は、スピーカ装置を示す平面図である。図２は、スピーカ装置を示す側面図である。図３は、スピーカ装置を示す断面図である。これら図１ないし図３において、１００はスピーカ装置で、このスピーカ装置１００は、例えば携帯電話やＰＨＳ(Personal Handyphone System)、ＰＤＡ（Personal Digital Assistant）、ノート型パソコンなど、特に携帯型の電気機器に用いられる小型のもので、音声信号を発音により出力する装置である。このスピーカ装置１００は、磁石部２００と、磁性体３００と、振動板４００と、ボイスコイル５００と、を備えている。
【００１１】
磁石部２００は、磁石本体２１０と、内側ヨーク２２０と、外側ヨーク２３０と、を備えている。磁石本体２１０は、磁性材料にて略リング状に形成され、内周面および外周面に異なる磁極面が形成されている。すなわち、磁石本体２１０は、例えば内周面にＮ極、外周面にＳ極となる状態に着磁されている。そして、磁石部２００と磁性体３００とで磁気回路が構成されている。
【００１２】
内側ヨーク２２０は、例えば鉄を主成分とする鋼板などの磁性材料にて略リング状に形成されている。この内側ヨーク２２０は、軸方向の寸法が磁石本体２１０とほぼ同じ、または若干長手に形成され、軸方向の一端面が磁石本体２１０の一端面に面一となる状態または若干軸方向にずれた状態にて磁石本体２１０の内周面に嵌合固定されている。なお、内側ヨーク２２０は、接着剤などにて磁石本体２１０に一体的に接合してもよい。
【００１３】
外側ヨーク２３０は、内側ヨーク２２０と同様に磁性材料にて略リング状に形成されている。この外側ヨーク２３０は、内径が磁石本体２１０の外径と略同寸法の外周嵌合部２３１を有している。この外周嵌合部２３１の軸方向の一端には、外方に鍔状に突出するフランジ部２３２が一連に折曲形成されている。さらに、フランジ部２３２の外周縁には、外周嵌合部２３１と同軸上の円筒状に折曲形成された位置決め嵌合部２３３が一連に折曲形成されている。そして、外側ヨーク２３０はフランジ部２３２が設けられた側と反対側の軸方向の一端面が磁石本体２１０の軸方向の一端面に面一となる状態または若干軸方向にずれた状態で磁石本体２１０を内周面に嵌合固定する状態で組み付けられ、磁石部２００が一体的に組立形成されている。この磁石部２００は、内側ヨーク２２０の内周面に磁極面すなわちＮ極を形成する状態となっている。なお、外側ヨーク２３０は、接着剤などにて磁石本体２１０に一体的に接合してもよい。
【００１４】
磁性体３００は、例えば内側ヨーク２２０および外側ヨーク２３０と同様に磁性材料にて略リング状に形成されている。この磁性体３００は、外径が外側ヨーク２３０の位置決め嵌合部２３３の内径と略同寸法の略円筒状に形成された外筒部３１０を有している。この外筒部３１０の軸方向の一端には、略円弧状に内周側に屈曲された架橋部３２０が一連に形成されている。さらに、架橋部３２０の内周縁には、外径が磁石部２００の内側ヨーク２２０の内径より所定寸法分で径小の略円筒状に形成された内筒部３３０が一連に屈曲形成されている。また、架橋部３２０には、略円形の通孔３２１が複数穿設されてもよい。
【００１５】
そして、磁性体３００は、外筒部３１０の架橋部３２０が設けられた側と反対側の端面が磁石部２００の外側ヨーク２３０のフランジ部２３２に当接するとともに、外筒部３１０が磁石部２００の外側ヨーク２３０の位置決め嵌合部２３３に嵌合する状態で接着剤などにて連結されている。なお、接着剤による接着に限らず、切り起こし形成した爪部を係合させて連結したり、溶接にて接合したりするなどで連結してもよい。この磁性体３００は、磁石部２００の外側ヨーク２３０に連結された状態で、内筒部３３０の外周面が内側ヨーク２２０の内周面に所定の間隙寸法の磁気ギャップＧを介して対向し、内筒部３３０の外周面に磁極面すなわちＳ極が形成されて磁気回路を構成する。
【００１６】
振動板４００は、例えば表面が防触処理されたマグネシウム薄板や樹脂フィルムなどにて略薄膜状に形成され、略中央に曲面状の振動部４１０を有している。この振動部４１０の周縁には、振動部４１０が湾曲する側と反対側に略円筒状の立上部４２０が一連に屈曲形成されている。この立上部４２０は、内径が磁性体の内筒部３３０の外径より径大で、かつ外径が磁石部２００の内側ヨーク２２０の内径より径小に形成されている。さらに、立上部４２０の軸方向の一端には、外周方向に振動部４１０と同方向に湾曲する曲面状となるエッジ部４３０が円弧状に一連に屈曲形成されている。また、エッジ部４３０の外周縁には、外方に鍔状に突出する挾持部４４０が一連に折曲形成されている。なお、振動板４００の径寸法は、磁石部２００の外側ヨーク２３０の位置決め嵌合部２３３における内径寸法と略同寸法に形成されている。また、挾持部４４０の径方向における幅寸法は、磁性体３００の外筒部３１０の厚さ寸法と略同寸法に形成されている。なお、振動部４１０、エッジ部４３０および立上部４２０はそれぞれ別体で構成してもよい。また、振動部４１０と立上部４２０を一体構成してもよいし、エッジ部４３０と立上部４２０を一体構成してもよい。
【００１７】
そして、振動板４００は、磁性体３００の磁石部２００への連結の際に、挾持部４４０が磁石部２００の外側ヨーク２３０のフランジ部２３２と外筒部３１０の一端部との間に挾持され磁性体３００に位置決め保持された状態で組み付けられる。この組み付けられた振動板４００は、立上部４２０が磁石部２００の内側ヨーク２２０と磁性体３００の内筒部３３０との間に接触することなく軸方向で移動自在に位置し、振動部４１０が磁性体３００の内筒部３３０の内周側に位置する状態で配設される。
【００１８】
ボイスコイル５００は、例えば線材が振動板４００の立上部４２０の外周面に直接巻回されて巻装されている。なお、接着剤などにて固定するとよい。そして、線材の両端部が図２における下方である磁性体３００が連結された側と反対側に引き出され、音声信号の入力端となる。また、立上部４２０の内周面にボイスコイルを固定してもよい。
【００１９】
（スピーカ装置の組立動作）
次に、上記スピーカ装置１００の組立動作を図面を参照して説明する。図４は、スピーカ装置１００の組立動作を示す説明図で、（Ａ）は磁石本体２１０と内側ヨーク２２０と外側ヨーク２３０との位置決め工程を示す説明図、（Ｂ）は振動板４００の位置決め工程を示す説明図、（Ｃ）は磁性体３００の組み付け工程を示す説明図、（Ｄ）はスピーカ装置１００の完成状態を示す説明図である。
【００２０】
まず、あらかじめ形成された組立治具６００を所定の組立位置に配置する。この組立治具６００は、図４に示すように、例えば合成樹脂にて形成され、略円板上の載置部６１０を有している。この載置部６１０の一面には、載置部６１０の中心を通る中心軸を有した略円筒状のギャップ位置決め部６２０が一体に突設されている。また、ギャップ位置決め部６２０には、複数に分割される状態に軸方向に沿って凹状に切り込み部６２１が複数切欠形成されてもよい。
【００２１】
そして、図４（Ａ）に示すように、組立治具６００にあらかじめ一体に組立形成した磁石部２００を、内周に組立治具６００のギャップ位置決め部６２０が嵌合する状態に載置部６１０上に載置させる。この後、この載置部６１０に載置した磁石部２００の外側ヨーク２３０のフランジ部２３２の上面に、図示しない接着剤を塗布する。
【００２２】
さらに、図４（Ｂ）に示すように、あらかじめボイスコイル５００を巻装した振動板４００の立上部４２０を、ボイスコイル５００の外周がギャップ位置決め部６２０の内周に嵌合する状態に嵌挿させる。この際、ギャップ位置決め部６２０に複数の切り込み部６２１が設けられていることから、比較的に摩擦力が軽減され、比較的に円滑に嵌合される。さらに、振動板４００の周縁部となる挾持部４４０を磁石部２００の外側ヨーク２３０の位置決め嵌合部２３３に嵌合しつつフランジ部２３２上に載置する状態に重ね合わせ、あらかじめ塗布した接着剤にて接合させる。
【００２３】
この後、図４（Ｃ）に示すように、磁性体３００の外筒部３１０の端部を、磁石部２００の外側ヨーク２３０の位置決め嵌合部２３３に嵌合させつつ、フランジ部２３２上の振動板４００の挾持部４４０に当接するまで嵌め込み、振動板４００の挾持部４４０をフランジ部２３２および外筒部３１０にて挾持させる。この状態で、あらかじめ塗布した接着剤により、フランジ部２３２と外筒部３１０とが接合される。
【００２４】
そして、図４（Ｄ）に示すように、磁石部２００および振動板４００のボイスコイル５００間からギャップ位置決め部６２０を引き抜くように、磁性体３００を接合した側と反対側から組立治具６００を取り外し、スピーカ装置１００が組立形成される。
【００２５】
（スピーカ装置の作用効果）
上述したように、上記第１の実施の形態では、ボイスコイル５００を一体的に設けた振動板４００の周縁部の挾持部４４０を位置決め保持して磁石部２００の一方の磁極面に磁石部２００を構成する外側ヨーク２３０を介して磁性体３００の外筒部３１０を接合し、磁性体３００の外筒部３１０から内周側に連続する架橋部３２０にて振動板４００のエッジ部４３０を覆い、架橋部３２０に連続する磁性体３００の内筒部３３０をボイスコイル５００の内周側に対向する状態とし、ボイスコイル５００を軸方向で移動自在に磁石部２００の径方向で介在する磁気ギャップＧを形成して磁気回路を形成させる。このため、磁性体３００が振動板４００の外周側からエッジ部４３０の表面を介してボイスコイル５００の内周側にドーム状に入り込む状態となり、ボイスコイル５００の外周側に磁石部２００が位置する構成が得られ、特に携帯型の電気機器に用いられるものでは振動板４００の振幅が比較的に狭いことから、エッジ部４３０と磁性体３００との距離を狭くしても十分に振動部４１０の振動による発音が得られ、厚さ方向の寸法を薄くすることができ、薄型化が容易に得られる。また、磁性体３００が発音する側の表面側でドーム状に位置することから、内筒部３３０の形状を特徴付けることで例えばホーン効果や管共振などの音響特性も他の部材を用いることなく容易に調整でき、汎用性の向上も図れる。
【００２６】
そして、振動板４００として、振動部４１０から略円筒状の立上部４２０を一連に設け、この立上部４２０から周縁部のエッジ部４３０を一連に設けて形成する。このため、この振動板４００の立上部４２０の外周面にボイスコイル５００を直接巻装することができ、製造性を向上できるとともに、ボイスコイル５００を巻装するボビンなどを用いなくても振動板４００に一体的に設けることができ、構成が簡略化して、小型軽量化およびコストの低減も容易に図れる。さらに、立上部４２０により、磁性体３００がボイスコイル５００の内周側に回り込む状態が容易に得られ、振動板４００および磁性体３００を複雑な形状とすることなく薄型化が容易に得られ、製造性の向上も容易に図れる。なお、予め巻装したボイスコイルを立上部４２０の内周面に接着剤等の固定部材で固定するようにしてもよい。
【００２７】
また、振動板４００の周縁部にエッジ部の外周縁に外方に向けて鍔状に突出し磁性体３００にて位置決め保持、すなわち磁石部２００の外側ヨーク２３０とにて挾持される挾持部４４０を一連に設けている。このため、磁性体３００にて振動板４００を位置決め保持することが容易、すなわち磁石部２００を構成する外側ヨーク２３０とにて挾持させる構成とすることで容易に振動板４００を位置決め保持でき、簡単な構成で容易に製造性を向上できる。
【００２８】
さらに、磁性体３００の外筒部３１０の一端面で振動板４００の周縁部を磁石部２００の外側ヨーク２３０とにて挾持するので、径方向における寸法増大を抑えつつ振動板４００の位置決め保持ができ、容易に小型化が図れる。
【００２９】
そして、振動板４００の径寸法を磁石部２００の外側ヨーク２３０の位置決め嵌合部２３３における内径と略同寸法に形成することで、振動板４００を容易に位置決めでき、位置決めするためのボスなどの特別な構成を設けることなくボイスコイル５００が磁気ギャップＧの所定位置に配置する位置決めが容易にでき、簡単な構成で製造性を容易に向上できる。
【００３０】
また、径方向に異極すなわち外周面および内周面に異なる磁極面を有するリング状の磁石本体２１０の内周側に内側ヨーク２２０を嵌合するとともに、外周側に外側ヨーク２３０を嵌合して磁性体３００を取り付ける前の磁気回路を一体的に組立形成している。このため、振動板４００の周縁部を位置決め保持するための構成として、磁性体３００と外側ヨーク２３０とにて挾持固定することが簡単な構成で得られ、製造性を向上できるとともに、磁性体３００が回り込んでボイスコイル５００の内周側に位置する状態で磁気ギャップＧを形成して磁気回路を形成することが簡単な構成で容易に得られる。
【００３１】
さらに、磁石部２００の一方の磁極面に連続して振動板４００のエッジ部４３０を覆ってボイスコイル５００の内周側に回り込む磁性体３００の構成として、磁石部２００の外側ヨーク２３０に接合する外筒部３１０の端部と、この外筒部３１０より径小で外周面がボイスコイル５００の内周に対向する内筒部３３０の端部とを、振動板４００のエッジ部４３０を覆う架橋部３２０にて一連に連結した構成とする。このため、簡単な構成で、例えば鋼板をプレス加工するなど簡単に形成でき、製造性を容易に向上できるとともに、薄型が容易に得られる。
【００３２】
また、磁石部２００の外側ヨーク２３０に位置決め嵌合部２３３を設け、磁性体３００を連結する際に磁性体３００を中心が互いに同芯上に位置するように位置決め嵌合する。このため、所定の磁気ギャップＧを得るための組立作業が容易にでき、簡単な構成で容易に製造性を向上できる。さらに、この位置決め嵌合部２３３にて振動板４００をも位置決めでき、より簡単な構成で容易に製造性を向上できる。
【００３３】
そして、振動板４００のエッジ部４３０に対向する磁性体３００の架橋部３２０に通孔３２１を設ける。このため、架橋部３２０とエッジ部４３０との間の空気が通孔３２１を介して外部と連通するので、発音時のボイスコイル５００の移動に連動して振動板４００のエッジ部４３０が振動する際に、架橋部３２０およびエッジ部４３０間の空気が加圧・減圧されてエッジ部４３０の振動を規制することを防止でき、良好な振動板４００の振動が得られ、音声信号の良好な再生出力が得られる。
【００３４】
〔第２の実施の形態〕
次に、本発明のスピーカ装置の他の実施の形態である第２の実施の形態を図５に基づいて説明する。この図５に示す第２の実施の形態は、上記第１の実施の形態における磁石部２００の着磁方向を変更したものである。図５は、第２の実施の形態におけるスピーカ装置を示す断面図である。なお、この第２の実施の形態において、第１の実施の形態と同一の構成については同一の符号を付して説明を省略する。以下後述する第三実施形態についても同様である。
【００３５】
（スピーカ装置の構成）
図５において、７００はスピーカ装置で、このスピーカ装置７００は、磁石部８００と、磁性体９００と、第１の実施の形態と同様の振動板４００およびボイスコイル５００と、を備えている。
【００３６】
そして、磁石部８００は、磁石本体８１０と、連結ヨーク８２０と、磁極形成ヨーク８３０と、を備えている。磁石本体８１０は、磁性材料にて略リング状に形成され、軸方向の両端面に異なる磁極面が形成されている。すなわち、磁石本体８１０は、例えば図５における上方側となる軸方向の端面がＮ極、図５における下方側となる軸方向の端面がＳ極となる状態に着磁されている。
【００３７】
連結ヨーク８２０は、例えば鉄を主成分とする鋼板などの磁性材料にて略リング状に形成されている。この連結ヨーク８２０は、内径および外径が磁石本体８１０と略同寸法に形成され、軸方向の上面となる一端面に接着剤などにて一体的に接合されている。また、連結ヨーク８２０は、内周面が軸方向の一方に向けて拡開する状態に傾斜して形成されている。そして、連結ヨーク８２０は、内周面が上方に向けて拡開する状態に例えば接着剤にて磁石本体８１０に一体的に接合されている。この接合された状態では、磁石本体８１０の角部と連結ヨーク８２０の角部とが連続し、磁石本体８１０の内周面と連結ヨーク８２０の内周面が鈍角で連続する状態となっている。なお、挾持部４４０の磁石本体８１０に接する面積が充分確保されているときは連結ヨーク８２０を省略して挾持部４４０を直接、磁石本体８１０に当接するようにしてもよい。
【００３８】
磁極形成ヨーク８３０は、連結ヨーク８２０と同様に磁性材料にて略リング状に形成されている。この磁極形成ヨーク８３０は、内径が磁石本体８１０の内径より径小で外径が磁石本体８１０の外径と略同寸法のリング状の挾持板部８３１を有している。この挾持板部８３１の内周縁には、挾持板部８３１の中心軸と同軸の中心軸を有した略円筒状の磁極形成部８３２が一連に折曲形成されている。また、磁極形成部８３２の軸方向の一端である上端面は、外方に向けて傾斜する状態に形成されている。そして、磁極形成ヨーク８３０は、外周縁が磁石本体８１０の外周縁に連続し挾持板部８３１と連結ヨーク８２０とにて磁石本体８１０を挾持する状態に接着剤にて一体的に接合される。この接合された状態では、磁極形成部８３２が磁石本体８１０の内周面に離間し、先端面である傾斜する端面により先端部が磁石本体８１０および連結ヨーク８２０から次第に離間し、磁石本体８１０に対向する角部が鈍角となる状態となっている。
【００３９】
磁性体９００は、図５に示すように、上記第１の実施の形態の磁性体３００における外側ヨーク２３０の下縁に外方に向けて鍔状に挾持鍔部９１０が一連に折曲された形状に形成されている。なお、挾持鍔部９１０は、磁性体９００の外径が磁石部２００の外径と略同寸法となるように形成されている。
【００４０】
そして、磁性体９００は、挾持鍔部９１０が磁石部２００の連結ヨーク８２０の上面に例えば接着剤にて一体的に連結されている。なお、接着剤による接着に限らず、切り起こし形成した爪部を係合させて連結したり、溶接にて接合したりするなどで連結してもよい。この磁性体９００は、磁石部２００に連結された状態で、内筒部３３０の外周面が磁極形成ヨーク８３０の磁極形成部８３２の内周面に所定の間隙寸法の磁気ギャップＧを介して対向する。このことにより、内筒部３３０の外周面に磁極面すなわちＮ極が形成され、磁極形成部８３２の内周面にＳ極が形成されて磁気回路が構成される。なお、磁石部２００の連結ヨーク８２０の内周面が傾斜し、磁極形成ヨーク８３０の磁極形成部８３２の先端面が傾斜するので、磁極形成部８３２の先端から連結ヨーク８２０および磁石本体８１０へ磁束が漏れることが抑制されている。
【００４１】
また、振動板４００の挾持部４４０は、第１の実施の形態より幅広で、振動板４００の径寸法が磁石部２００の外径と略同寸法に形成されている。すなわち、挾持部４４０の径方向における幅寸法は、磁性体の外径から磁性体９００の外筒部３１０の内径を差し引いた寸法に形成されている。このことにより、磁性体９００の磁石部２００への接着の際に、エッジ部４３０の外周面が外筒部３１０の内周面にて位置決めされる状態となっている。
【００４２】
（スピーカ装置の組立動作）
次に、上記スピーカ装置７００の組立動作を説明する。
上述した第１の実施の形態と同様の組立治具６００を所定の組立位置に配置する。そして、組立治具６００にあらかじめ一体に組立形成した磁石部８００を、内周に組立治具６００のギャップ位置決め部６２０が嵌合する状態に載置部６１０上に載置させる。この後、磁石部８００の連結ヨーク８２０の上面に、図示しない接着剤を塗布する。
【００４３】
この後、あらかじめボイスコイル５００を巻装した振動板４００の立上部４２０を、ボイスコイル５００の外周がギャップ位置決め部６２０の内周に嵌合する状態に嵌挿させる。そして、振動板４００の周縁となる挾持部４４０を磁石部８００の連結ヨーク８２０上に重畳させ、あらかじめ塗布した接着剤にて接合させる。この後、挾持部４４０の上面にさらに接着剤を塗布する。
【００４４】
そして、磁性体９００の挾持鍔部９１０を、外周縁が挾持部４４０の外周縁および磁石部８００の外周縁に面一上となるように磁石部８００に接着した振動板４００の挾持部４４０に重畳させ、あらかじめ塗布した接着剤にて接合する。この磁性体９００の接合の際、振動板４００のエッジ部４３０の外周面が磁性体９００の外筒部３１０の下端縁にて位置決めされる。このことにより、内筒部３３０および磁石部２００の磁極形成部８３２間にボイスコイル５００が所定の位置に配置する状態となる。この後、組立治具６００を第１の実施の形態と同様に取り外して、スピーカ装置７００が組立形成される。
【００４５】
（スピーカ装置の作用効果）
上述したように、上記第２の実施の形態では、第１の実施の形態と同様に、磁性体９００を磁石部８００の一方の磁極面に連結ヨーク８２０を介して接合し、振動板４００のエッジ部４３０を覆ってボイスコイル５００の内周側に回り込む状態に設ける。このため、第１の実施の形態と同様に、容易に薄型化できる。また、磁性体９００の内筒部３３０の形状を特徴付けることで例えばホーン効果や管共振などの音響特性も他の部材を用いることなく容易に調整でき、汎用性の向上も図れる。
【００４６】
また、磁性体９００に磁石部８００とにて挾持固定する挾持鍔部９１０を設けている。このため、確実に磁性体９００を接合でき、良好な磁気回路が得られるとともに、振動板４００を確実に固定できる。
【００４７】
そして、振動板４００として、径寸法を磁石部２００の外径と略同寸法に形成し、挾持部４４０の径方向における幅寸法を磁性体の外径から磁性体９００の外筒部３１０の内径を差し引いた寸法に形成している。このため、磁性体９００の磁石部２００への接合の際に、エッジ部４３０の外周面が外筒部３１０の内周面にて位置決めされる状態となり、特別な構成を設けることなくボイスコイル５００を所定の位置に配置させることが容易にできる。
【００４８】
さらに、磁性体９００の外径を磁石部８００の外径と同寸法とするため、磁性体９００と磁石部８００との中心が同芯軸上に位置させることが容易にでき、製造性を向上できるとともに、磁性体９００の接合の際に外周縁の状況を確認する簡単な作業で適切な磁気ギャップＧに組立形成できる。
【００４９】
そして、磁石部８００の連結ヨーク８２０の内周面を傾斜したため、磁極形成部８３２から連結ヨーク８２０へ磁束が漏れることを防止でき、良好な磁気回路を簡単な構成で得ることができる。さらに、磁極形成部８３２の先端面をも傾斜したため、より磁束の漏れを防止でき、より良好な磁気回路が得られる。そしてさらに、連結ヨーク８２０の内周縁を磁石本体８１０の内周縁に連続させて接合するため、磁石本体８１０の角部が露出せず、磁極形成部８３２の先端から磁石本体８１０の角部へ磁束が漏れることをより防止でき、より良好な磁気回路が得られる。
【００５０】
〔第３の実施の形態〕
次に本発明のスピーカ装置の他の実施形態である第３の実施の形態を図６、図７に基づいて説明する。この図６に示す第３の実施の形態は、前述した第１の実施の形態におけるリング状の磁石部２００を棒状磁石に変更したものである。図６は第３の実施の形態におけるスピーカ装置を示す平面図であり、図７は図６の一点鎖線Ａ−Ａにおける断面図である。
【００５１】
（スピーカ装置の構成)
図６において、１００Ａはスピーカ装置で、このスピーカ装置１００Ａは、磁石部２００Ａと、磁性体３００Ａと、振動板４００Ａと、ボイスコイル５００Ａとを備えている。
【００５２】
磁石部２００Ａは、磁石本体２１０Ａと、内側ヨーク２２０Ａと、外側ヨーク２３０Ａとを備えている。磁石本体２１０Ａは、磁性材料にて長手方向を有する棒状に形成され、内側面（スピーカ装置１００Ａの中心位置に向かう方向の面)と外側面（スピーカ装置１００Ａの外側に向かう面）とに異なる磁極面が形成されている。すなわち、磁石本体２１０Ａは、例えば、内側面にＮ極、外側面にＳ極となる状態に着磁されていて、磁石部２００Ａと磁性体３００Ａとの間で磁気回路が形成される。
【００５３】
内側ヨーク２２０Ａは、例えば鉄を主成分とする鋼板などの磁性材料にて長手方向を有する棒状平板に形成されている。この内側ヨーク２２０Ａは、軸方向の寸法が磁石本体２１０Ａより若干長手に形成され、軸方向の一端面が磁石本体２１０Ａの一端面に面一となる状態で磁石本体２１０Ａの内側面に接着剤等の接着手段にて固定されている。
【００５４】
外側ヨーク２３０Ａは、内側ヨーク２２０Ａと同様に磁性材料にて形成されている。外側ヨーク２３０Ａは、互いに対向する直線部２３３Ａとこれらの直線部２３３Ａを連結させる円弧部２３４Ａとを備えている。外側ヨーク２３０Ａは、磁石本体２１０Ａに固定される外側固定部２３１Ａを有している。この外側固定部２３１Ａの軸方向の一端には、外方に鍔状に突出するフランジ部２３２Ａが一連に折曲形成されている。そして、外側ヨーク２３０Ａの直線部２３３Ａはフランジ部２３２Ａが設けられた側と反対側の軸方向の一端面が磁石本体２１０Ａの軸方向の一端面に面一となる状態で磁石本体２１０Ａに固定された状態で組み付けられ、磁石部２００Ａが一体的に組立形成されている。この磁石部２００は、内側ヨーク２２０Ａの内側面に磁極面すなわちＮ極を形成し、外側ヨーク２３０Ａの外側面に磁極面すなわちＳ極を形成している。スピーカ装置１００Ａにはこのような棒状の磁石部２００Ａがそれぞれ対向する位置に一対設けられている。
【００５５】
磁性体３００Ａは、磁性材料にて略棒状に形成されている。この磁性体３００Ａは、外側ヨーク２３０Ａの軸方向上部に形成される外筒部としての外枠部３１０Ａを有している。この外枠部３１０Ａの軸方向の下端には、外方に鍔状に突出する押さえ部３１１Ａが一連に折曲形成されている。外枠部３１０Ａの他端には、略円弧状に内側に屈曲された架橋部３２０Ａが一連に形成されている。さらに、架橋部３２０Ａの外枠部３１０Ａが形成される側と反対の端部には、磁石部２００Ａの内側ヨーク２２０Ａの内側面より所定寸法分内側に略棒状平板に形成された内筒部としての内枠部３３０Ａが一連に屈曲形成されている。また、架橋部３２０Ａには、略円形の通孔３２１が複数穿設されている。
【００５６】
そして、磁性体３００Ａは、外枠部３１０Ａの押さえ部３１１Ａが磁石部２００Ａの外側ヨーク２３０Ａのフランジ部２３２Ａに当接するとともに、接着剤により固定されている。なお、接着剤による接着に限らず、切り起こし形成した爪部を係合させて連結したり、溶接にて接合したりするなどで連結してもよい。この磁性体３００Ａは、磁石部２００Ａに連結された状態で、内枠部３３０Ａの外側面が内側ヨーク２２０Ａの内側面に所定の間隙寸法の磁気ギャップＧを介して対向し、内枠部３３０Ａの外側面に磁極面すなわちＳ極が形成されて磁気回路を構成する。
【００５７】
振動板４００Ａは、例えば表面が防触処理されたマグネシウム薄板や樹脂フィルムなどにて略薄膜状に形成されている。振動板４００Ａは、磁石部２００Ａ及び磁性体３００Ａの棒状形状に合わせて長手方向を有する長円形に形成されていて、この長手方向に沿う二辺に対応した位置にそれぞれ磁石部２００Ａおよび磁性体３００Ａが配置されている。この振動板４００Ａの略中央に曲面状の振動部４１０Ａを有している。この振動部４１０Ａの周縁には、振動部４１０が湾曲する側と反対側に略円筒状の立上部４２０Ａが一連に屈曲形成されている。この立上部４２０Ａは、磁性体の内枠部３３０Ａの外側面と磁石部２００Ａの内側ヨーク２２０Ａの内側面との間を接触しないように形成されている。さらに、立上部４２０Ａの軸方向の一端には、外側方向に振動部４１０Ａと同方向に湾曲する曲面状となるエッジ部４３０Ａが円弧状に一連に屈曲形成されている。また、エッジ部４３０Ａの外周には、外方に鍔状に突出する挾持部４４０Ａが一連に折曲形成されている。なお、振動部４１０Ａ、エッジ部４３０Ａおよび立上部４２０Ａはそれぞれ別体で構成してもよい。また、振動部４１０Ａと立上部４２０Ａを一体構成してもよいし、エッジ部４３０Ａと立上部４２０Ａを一体構成してもよい。
【００５８】
ボイスコイル５００Ａは、例えば線材が振動板４００の立上部４２０の外側面に直接巻回されて巻装されている。なお、接着剤などにて固定するとよい。そして、線材の両端部が、磁性体３００が連結された側と反対側に引き出され、音声信号の入力端となる。
【００５９】
また、外側ヨーク２３０Ａの磁石本体２１０Ａが配置されない円弧部２３４Ａでは振動板４００Ａが平面方向に円弧状に形成されている。ボイスコイル５００Ａは、磁石本体２１０Ａおよび磁性体３００Ａが配置される箇所においては直線部分を有し、棒状の磁石本体２１０Ａの沿って配置される、外側ヨーク２３０Ａの円弧部２３４Ａに当たる箇所では振動板４００Ａの立上部４２０Ａの形状に合わせて円弧状に形成される。
振動板４００Ａの挾持部４４０Ａは、磁石本体２１０Ａおよび磁性体３００Ａが配置される直線部２３３Ａにおいて、外側ヨーク２３０Ａのフランジ部２３２Ａと外枠部３１０Ａの押さえ部３１１Ａに挟持されて固定され、円弧部では、外側ヨーク２３０Ａに接着等の手段により固定されている。また、円弧部において外側ヨーク２３０Ａを覆い振動板４００Ａを挟持する保持具を用いてもよい。
【００６０】
（スピーカ装置の作用効果）
前述した第１の実施の形態の作用効果と同様に、磁性体３００Ａを磁石部２００Ａの一方の磁極面に外側ヨーク２３０Ａを介して接合し、振動板４００Ａのエッジ部４３０Ａを覆ってボイスコイル５００の内側に回り込む状態に設ける。これにより、第１の実施の形態と同様に、容易に薄型化でき、内枠部３３０Ａの形状を特徴付けることにより例えばホーン効果や管共振などの音響特性も他の部材を用いることなく用意に調整できる。
【００６１】
また、第３の実施の形態では棒状の磁石部２００Ａを用いているので、リング状の磁石に比べて、加工しやすく、また加工にかかる費用も安くなる。これにより、第３の実施の形態では、生産かかる手間やコストが低減できる。
【００６２】
さらに、ボイスコイル５００Ａは、直線部分を有する形状に振動板４００Ａの立上部４２０Ａに巻装されているので、このボイスコイル５００Ａ直線部分と棒状の磁石部２００Ａの直線部分を対応させて配置することができる。これにより、ボイスコイル５００Ａが撓むことなく、磁石部２００Ａの磁極面と絶えず一定の距離を保てるので、良好な磁気回路を維持することが可能である。
【００６３】
そして、一対の棒状の磁石部２００Ａが対向して配置されているため、これらの磁石部２００Ａによって形成される磁気回路は対照的な形となり、ボイスコイル５００Ａに流れる電気信号によって左右対称な同様の振動を得ることができるので、良好な振動板４００Ａの振動が得られ、音声信号の良好な再生出力が得られる。
【００６４】
また、振動板４００Ａは、ボイスコイル５００Ａの形状、および磁石部２００Ａの形状に合わせて長手方向および長手方向と直交する方向を有する長円形状に形成されているため、例えば挾持部４４０Ａの寸法を容易に合わすことができる等、組み立てが容易に行える。
【００６５】
〔第４の実施の形態〕
次に本発明のスピーカ装置の他の実施形態である第４の実施の形態を図８ないし図１０に基づいて説明する。図８は第４の実施の形態におけるスピーカ装置を示す平面図であり、図９は図８の一点鎖線Ｂ−Ｂにおける断面図であり、図１０は図８の一点鎖線Ｃ−Ｃにおける断面図である。
【００６６】
（スピーカ装置の構成)
第３の実施の形態のスピーカ装置においてボイスコイルを平面略矩形形状に形成したものが第４の実施の形態である。図８において、スピーカ装置１００Ｂは、ボイスコイル５００Ｂは矩形状に形成され、この矩形形状の４辺に対応した位置に棒状の磁石部２００Ａ，２００Ｂが配置されている。すなわち、矩形の長手方向に対向する一対の棒状の磁石部２００Ａが配置され、長手方向と直交する方向に一対の対向する棒状の磁石部２００Ｂが配置されている。これらの磁石部２００Ｂは、磁石部２００Ａの両端側に配置され、磁石部２００Ａの長さ寸法よりも小さく設計されている。磁石部２００Ａについては、前述した第３の実施の形態と同様のため説明を省略し、以下、磁石部２００Ｂが配置され長手方向と直交する方向について説明する。
【００６７】
磁石部２００Ｂは、磁石本体２１０Ｂと、内側ヨーク２２０Ｂと、外側ヨーク２３０Ｂとを備えている。磁石本体２１０Ｂは、磁性材料にて棒状に形成され、内側面と外側面とに磁石本体２１０Ａと同一となる磁極面が形成されている。すなわち、磁石本体２１０Ｂは、例えば、磁石本体２１０Ａの内側面にＮ極、外側面にＳ極が着磁されていれば、磁石本体２１０Ｂは内側面にＮ極、外側面にＳ極となる状態に着磁されている。
【００６８】
内側ヨーク２２０Ｂは、第３の実施の形態で述べた内側ヨーク２２０Ａと同様に形成される部材であるが、固定される磁石本体２１０Ｂの長さ寸法が磁石本体２１０Ａの長さ寸法より小さいため、内側ヨーク２２０Ｂの長手方向寸法も内側ヨーク２２０Ａの長手方向寸法より小さく設定されている。
【００６９】
外側ヨーク２３０Ｂは、互いに対向する直線部２３３Ａとこれらの直線部２３３Ａを連結させる円弧部２３４Ｂとを備えている。外側ヨーク２３０Ｂは、磁石本体２１０Ａに固定される外側固定部２３１Ａ、及び磁石本体２１０Ｂに固定される外側固定部２３１Ｂを有している。この外側固定部２３１Ａ，２３２Ｂの軸方向の一端には外方に鍔状に突出するフランジ部２３２Ａ，２３２Ｂが一連に折曲形成されている。この時、円弧部２３４Ａでのフランジ部２３２Ｂは、直線部２３３Ａでのフランジ部よりも外側に大きく形成されていて、振動板４００Ｂの挾持部４４０Ａをフランジ部２３２Ａ，２３２Ｂに接着固定できるようにしている。
【００７０】
この外側ヨーク２３０Ｂの外側固定部２３１Ｂの軸方向上部には、磁性体３００Ｂの一部を構成する外筒部としての外枠部３１０Ｂが配置されている。この外枠部３１０Ｂの軸方向の下端には、外方に鍔状に突出する押さえ部３１１Ｂが一連に折曲形成されている。この押さえ部３１１Ｂは外部に大きく突出した形状をしていて、外側ヨーク２３０Ｂのフランジ部２３２Ｂと接合されるように形成している。外枠部３１０Ｂの他端には、略円弧状に内側に屈曲された架橋部３２０Ｂが一連に形成され、さらに、架橋部３２０Ｂの内側には、内筒部としての内枠部３３０Ｂが一連に屈曲形成されている。この磁性体３００Ｂは、磁石部２００Ｂの外側ヨーク２３０Ｂに連結された状態で、内枠部３３０Ｂの外周面が内側ヨーク２２０Ｂの内周面に所定の間隙寸法の磁気ギャップＧを介して対向し、内枠部３３０Ｂの外周面に磁極面すなわちＳ極が形成されて磁気回路を構成する。
【００７１】
振動板４００Ｂは、例えば表面が防触処理されたマグネシウム薄板やコーン紙などにて略薄膜状に形成されている。振動板４００Ｂは、磁石部２００Ａ及び磁性体３００Ａの棒状形状に合わせて長手方向を有する長円形に形成されている。振動板４００Ｂの略中央に曲面状の振動部４１０Ｂを有している。この振動部４１０Ｂは略矩形状に形成されていて、この振動部４１０Ｂの周縁には、振動部４１０Ｂが湾曲する側と反対側に略円筒状の立上部４２０Ｂが一連に屈曲形成されている。この立上部４２０Ｂは、磁性体の内枠部３３０Ａ，３３０Ｂの外側面と磁石部２００Ａ，２００Ｂの内側ヨーク２２０Ａ，２２０Ｂの内側面との間を接触しないように形成されている。さらに、立上部４２０Ｂの軸方向の一端には、外側方向に振動部４１０Ｂと同方向に湾曲する曲面状となるエッジ部４３０Ｂが円弧状に一連に屈曲形成されている。また、エッジ部４３０Ｂの外周には、外方に鍔状に突出する挾持部４４０Ｂが一連に折曲形成されている。なお、振動部４１０Ｂ、エッジ部４３０Ｂおよび立上部４２０Ｂはそれぞれ別体で構成してもよい。また、振動部４１０Ｂと立上部４２０Ｂを一体構成してもよいし、エッジ部４３０Ｂと立上部４２０Ｂを一体構成してもよい。
【００７２】
（スピーカ装置の作用効果）
前述した第１の実施の形態の作用効果と同様に、磁性体３００Ａ，３００Ｂを磁石部２００Ａ，２００Ｂの一方の磁極面に外側ヨーク２３０Ｂを介して接合し、振動板４００Ｂのエッジ部４３０Ｂを覆ってボイスコイル５００Ｂの内側に回り込む状態に設ける。これにより、第１の実施の形態と同様に、容易に薄型化でき、内枠部３３０Ａ，３３０Ｂの形状を特徴付けることにより例えばホーン効果や管共振などの音響特性も他の部材を用いることなく用意に調整できる。
【００７３】
また、ボイスコイル５００Ｂが矩形形状に形成され、この矩形の長手方向に互いに対向する一対の棒状の磁石部２００Ａが設けられ、長手方向と直交する方向に互いに対向する一対の棒状の磁石部２００Ｂが磁石部２００Ａの両端側に設けられている。これにより、リング状の磁石を用いた場合よりも作成が容易であるうえに、棒状磁石によってボイスコイル５００Ｂの全周部に磁気回路を形成することができるので、良好な音声の再生出力を得ることができる。
【００７４】
〔実施の形態の変形〕
なお、本発明は、上述した各実施の形態に限定されるものではなく、本発明の目的を達成できる範囲で以下に示される変形をも含むものである。
【００７５】
すなわち、磁石部２００，８００の構成は上述した構成に限らず、適宜変更できる。例えば、上述したように、連結ヨーク８２０を設けないなどとしてもよい。また、磁性体３００，９００についても磁石部２００，８００の一方の磁極面に連結してボイスコイル５００の内周側に回り込む状態となるいずれの形状に変更できる。例えば、第２の実施の形態において、磁性体９００の外筒部３１０の端部にて十分に接合できる場合には、挾持鍔部９１０を設けない、フランジ部２３２を設けないなどしてもよい。さらに、第１の実施の形態においても、位置決めが組立治具などにより容易にできるのでれば、位置決め嵌合部２３３を設けなくてもよい。
【００７６】
例えば、図１１に示すように、第１の実施の形態における磁石部２００の外側ヨーク２３０に位置決め嵌合部を設けず、第２の実施の形態における磁性体９００を用いて振動板４００を挾持固定するようにしてもよい。
【００７７】
また、例えば図１１に示すように、磁性体３００に、バスレフレックス効果やホーン効果、管共振などの音響特性が得られる構成を設けてもよい。すなわち、図１１を例にとると、９５０はカバー部で、このカバー部９５０は、例えば鋼板などにて略円板状に形成された板部９５１を有している。この板部９５１の周縁には、一面側に傾斜して折曲され、磁性体９００に接合される接合部９５２が設けられている。また、板部９５１には、円形孔９５３Ａが複数開口形成されている。そして、円形孔９５３Ａの内周縁には、接合部９５２が折曲する側に導出する略円筒状のダクト９５３が一連に設けられている。このカバー部９５０は、ダクト９５３が振動板４００に向けて突出する状態に、接合部９５２の先端部が磁性体９００の架橋部３２０に溶接などにより接合され、一体的に磁性体９００に取り付けられる。なお、磁性体９００に設ける通孔３２１は、カバー部９５０と振動板４００とにて区画される空間に臨む状態に設けることが好ましく、このような構成によると、エッジ部４３０と磁性体９００との間の空間をダクト９５３と共振させる容積として使用できるので、バスレフレックス効果が演出することができ、より適切な音響特性が得られる。
【００７８】
また、図６におけるカバー部９５０Ａは略矩形状に形成された板部９５１Ａを有している。この板部９５１Ａの周縁は、磁性体３００Ａに接合されていて、互いに対向する磁性体３００Ａを連結している。特に第３の実施の形態のように一対の棒状の磁石部２００Ａが対向配置されたスピーカ装置１００Ａはスピーカ装置の長手方向と直交する方向への圧力に弱くなるが、このカバー部９５０Ａで磁性体３００Ａ間に連結することでスピーカ装置１００Ａを補強するとともに振動板４００Ａを保護することができる。また、このカバー部９５０Ａに設けられる孔部９５４はスピーカ装置１００Ａより発生する音の振動を外部に伝える孔である。
【００７９】
このように、磁性体３００，９００がエッジ部４３０を覆ってボイスコイル５００の内周側に回り込む形状であることから、略円板上のカバー部９５０を容易に取り付けることができ、製造性を向上できるとともに、簡単な構成で振動板４００を保護できる。さらには、略円筒状のホーン部９５３をカバー部９５０に設ける簡単な構成で、音響特性を付与させることが容易にできる。なお、振動板４００のカバーとしてのみカバー部９５０を用いる場合には、板部９５１を例えばパンチングメタルやメッシュ状の構成として音の伝播性を確保する構成とすることが好ましい。
【００８０】
さらに、磁性体３００，９００と磁石部２００，８００との接合する構成は、いずれの方法としてもよい。例えば、図１２に示すように、十分な位置決め保磁力が得られるのであれば、振動板４００の挾持部４４０の幅寸法を狭くして、磁性体３００の挾持鍔部９１０と磁石部８００の連結ヨーク８２０との一部が直接接合するようにしてもよい。この場合、例えば挾持鍔部９１０に挾持部４４０の厚さ分で段差を設けることにより、位置決めが容易にできるとともに、挾持鍔部９１０および連結ヨーク８２０の密着性が向上するので好ましい。この図１２に示す構成によれば、磁性体３００と磁石部８００とが直接接合するので、磁束の漏れを防止し良好な磁気回路を得ることができる。なお、挾持部４４０の厚さ分の段差は、連結ヨーク８２０に設けたり、双方に設けてもよい。
【００８１】
また、磁性体３００，９００と磁石部２００，８００との接合の際に振動板４００の周縁部を挾持して位置決め保持して説明したが、この挾持固定にて位置決め保持する構成に限らず、例えば磁性体３００，９００に振動板４００を位置決め保持する構成を設け、直接磁性体３００，９００に振動板４００を位置決め保持させるなどしてもよい。
【００８２】
そして、スピーカ装置１００，７００としては、上述したように、携帯型の電気機器に用いるものに限られない。
【００８３】
また、スピーカ装置１００，７００を組立形成する際、組立治具６００を用いなくてもよい。そして、組立治具６００としては、上記構成に限られない。例えば磁性体９００を用いる場合、磁石部２００，８００の外周面を磁性体９００の外周が連続する状態に位置決めする部材をさらに設けた構成などの治具を用いてもよい。さらに、切り込み部６２１を有しない構成、位置決め部６２０を略円柱状に形成して円周上に複数突設した構成などとしてもよい。
【００８４】
そして、スピーカ装置１００，７００の背面側である磁性体３００，９００が取り付けられる側と反対側の組立治具６００が取り外される側に、ネット、織布、不織布などの防塵部材を設けてもよい。
【００８５】
また、振動板４００の立上部４２０の外周面にボイスコイル５００を巻装して説明したが、例えば立上部４２０の内周面に巻装してもよい。
【００８６】
さらに、第３、第４の実施の形態において、振動板４００Ａ，４００Ｂの平面方向の形状は長円形状としているが、矩形形状や楕円形状、三角形状や六角形状等の略多角形状等でもよく、閉口状に形成しているものであればよい。また、同様にボイスコイル５００Ａ、５００Ｂについても例えば、平面方向の形状は矩形形状や楕円形状、三角形状や六角形状等の略多角形形状でもよく、すなわち閉口状に形成されているものであればよい。ボイスコイルが平面楕円形状に形成されている場合は、楕円状の磁石を用いてもよく、また円弧状の磁石と棒状の磁石を組み合わせても用いてもよい。ボイスコイルが平面略多角形状に形成されている場合は、それぞれの辺に対応する位置に棒状磁石を設置することができる。
【００８７】
また、第１、第２の実施の形態ではリング状の磁石を用いて、第３、第４の実施の形態では棒状の磁石を用いたが、これらのリング状の磁石と棒状の磁石を組み合わせて形成されるスピーカ装置であってもよく、これらの磁石の形状は特にこだわらない。例えば、長手方向を有する長円形のスピーカ装置で直線部においては棒状の磁石を用い、円弧部においては半円状の磁石を用い、前周部に亘って磁気回路を形成できるスピーカ装置であってもよい。
【００８８】
また、第１、第３及び第４の実施の形態及びこれらの図３，図７，図９において、磁石部２００，２００Ａ，２００Ｂは、内側ヨーク２２０，２２０Ａ，２２０Ｂと磁石本体２１０，２１０Ａ，２１０Ｂと外側ヨーク２３０，２３０Ａ，２３０Ｂとが軸方向における一端面が面一となるように形成されているが、これに限らない。すなわち、例えば、図１３に示すように磁石分２００の磁石本体２１０が軸方向に沿って若干下方に配置されているものであってもよい。
【００８９】
その他、本発明の実施の際の具体的な構造および手順は、本発明の目的を達成できる範囲で他の構造などに適宜変更できる。
【００９０】
〔実施の形態の作用効果〕
上述したように、ボイスコイル５００を一体的に設けた振動板４００の周縁部を位置決め保持して磁石部２００の一方の磁極面に磁性体３００を連続させ、振動板４００のエッジ部４３０を覆ってボイスコイル５００の内周側に磁性体３００が対向する状態とし、ボイスコイル５００を軸方向で移動自在に磁石部２００の径方向で介在する磁気ギャップＧを形成して磁気回路を形成させる。このため、磁性体３００が振動板４００の外周側からエッジ部４３０の表面を介してボイスコイル５００の内周側にドーム状に入り込む状態となり、ボイスコイル５００の外周側に磁石部２００が位置する構成が得られ、特に携帯型の電気機器に用いられるものでは振動板４００の振幅が比較的に狭いことから、エッジ部４３０と磁性体３００との距離を狭くしても十分に振動部４１０の振動による発音が得られ、厚さ方向の寸法を薄くすることができ、容易に薄型化できる。また、磁性体３００が発音する側の表面側でドーム状に位置することから、例えばホーン効果や管共振などの音響特性も他の部材を用いることなく磁性体３００により容易に調整でき、汎用性の向上も図れる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態におけるスピーカ装置を示す平面図である。
【図２】前記第１の実施の形態におけるスピーカ装置を示す側面図である。
【図３】前記第１の実施の形態におけるスピーカ装置を示す断面図である。
【図４】前記第１の実施の形態におけるスピーカ装置の組立動作を示す説明図である。
（Ａ）：磁石の位置決め工程を示す説明図
（Ｂ）：振動板の位置決め工程を示す説明図
（Ｃ）：磁性体の組み付け工程を示す説明図
（Ｄ）：スピーカ装置の完成状態を示す説明図
【図５】本発明の第２の実施の形態におけるスピーカ装置を示す断面図である。
【図６】本発明の第３の実施の形態におけるスピーカ装置を示す平面図である。
【図７】本発明の第３の実施の形態におけるスピーカ装置を示す断面図である。
【図８】本発明の第４の実施の形態におけるスピーカ装置を示す平面図である。
【図９】本発明の第４の実施の形態におけるスピーカ装置を示す断面図である。
【図１０】本発明の第４の実施の形態におけるスピーカ装置を示す別の断面図である。
【図１１】本発明のさらに他の実施の形態におけるスピーカ装置を示す断面図である。
【図１２】本発明のさらに他の実施の形態におけるスピーカ装置を示す断面図である。
【図１３】本発明のさらに他の実施の形態におけるスピーカ装置を示す断面図である。
【符号の説明】
１００，７００，１００Ａ，１００Ｂスピーカ装置
２００，８００，２００Ａ，２００Ｂ磁石部
２１０，８１０，２１０Ａ，２１０Ｂ磁石本体
２２０，２２０Ａ，２２０Ｂ内側ヨーク
２３０，２３０Ａ外側ヨーク
２３３位置決め部としての位置決め嵌合部
３００，９００，３００Ａ，３００Ｂ磁性体
３１０，３１０Ａ，３１０Ｂ外筒部
３２０，３２０Ａ，３３０Ｂ架橋部
３２１通孔
３３０，３３０Ａ，３３０Ｂ内筒部
４００，４００Ａ，４００Ｂ振動板
４１０，４１０Ａ，４１０Ｂ振動部
４２０，４２０Ａ，４２０Ｂ立上部
４３０，４３０Ａ，４３０Ｂエッジ部
４４０，４４０Ａ，４４０Ｂ挾持部
５００，５００Ａ，５００Ｂボイスコイル
６００組立治具
６１０載置部
６２０ギャップ位置決め部
６２１切り込み部
８２０連結ヨーク
８３０磁極形成ヨーク
９５０，９５０Ａ，９５０Ｂカバー部
９５３ホーン部
Ｇ磁気ギャップ[0001]
BACKGROUND OF THE INVENTION
The present invention provides a speaker device that vibrates a diaphragm with a voice coil disposed in a magnetic circuit and generates a sound. In place Related.
[0002]
[Prior art]
Conventionally, speaker devices can be broadly classified into two types, an inner magnet type and an outer magnet type (see, for example, Patent Document 1). As described in Patent Document 1, an internal magnet type speaker device has a magnet disposed between a yoke formed of a magnetic material in a substantially dish shape and a disk-shaped top plate. A cylindrical voice coil integrally provided on one surface of the diaphragm is disposed in the magnetic gap between the periphery of the yoke and the periphery of the top plate so as to be movable in the axial direction. On the other hand, an outer-magnet type speaker device has a flange portion projecting outwardly in a hook shape at one axial end of a center pole formed in a substantially cylindrical shape of a yoke, and a ring-shaped top corresponding to the flange portion. A ring-shaped magnet is disposed between the plate and the plate. A cylindrical voice coil integrally provided on one surface of the diaphragm is disposed in the magnetic gap between the outer peripheral surface of the center pole of the yoke and the inner peripheral surface of the top plate so as to be movable in the axial direction. .
[0003]
[Patent Document 1]
JP-A-58-53299 (page 3, upper left column-page 4, lower right column, FIGS. 3 and 6)
[0004]
[Problems to be solved by the invention]
By the way, portable electric devices such as mobile phones, PHS (Personal Handyphone System), PDA (Personal Digital Assistant), and notebook personal computers have been widely used in recent years, and a reduction in size and weight of the speaker is expected.
[0005]
The present invention is a speaker device that can be easily reduced in thickness in view of the above situation. Place The purpose is to provide.
[0006]
[Means for Solving the Problems]
A magnet body, a yoke magnetically coupled to an outer peripheral surface on which one of the magnetic poles of the magnet body is formed, a vibrating portion, an edge portion, and an upright portion disposed between the vibrating portion and the edge portion A magnetic plate that is magnetically coupled to the yoke and disposed opposite the magnet body, and a voice coil wound around the upright portion of the diaphragm, The magnetic body is provided with an inner cylindrical portion disposed inside the magnet body, an outer cylindrical portion disposed outside the magnet, and the edge provided between the inner cylindrical portion and the outer cylindrical portion. A bridging portion arranged to cover the portion, and the inner cylinder portion is formed along the upright portion continuously to the bridging portion, and a magnetic gap is formed between the inner cylinder portion and the magnet body. The diaphragm is arranged with the upright portion in the magnetic gap. Together are, the vibrating portion on the inner side of the inner cylinder portion is provided in a state of being arranged This is a speaker device.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment which is an embodiment of a speaker device of the present invention will be described with reference to the drawings. In addition, although this Embodiment illustrates about a small speaker apparatus, it is not this limitation.
[0010]
[First Embodiment]
(Configuration of speaker device)
FIG. 1 is a plan view showing the speaker device. FIG. 2 is a side view showing the speaker device. FIG. 3 is a cross-sectional view showing the speaker device. In FIGS. 1 to 3, reference numeral 100 denotes a speaker device. The speaker device 100 is used for a portable electric device such as a mobile phone, a PHS (Personal Handyphone System), a PDA (Personal Digital Assistant), and a notebook personal computer. It is a small-sized device that outputs sound signals by sound generation. The speaker device 100 includes a magnet unit 200, a magnetic body 300, a diaphragm 400, and a voice coil 500.
[0011]
The magnet unit 200 includes a magnet main body 210, an inner yoke 220, and an outer yoke 230. The magnet body 210 is formed of a magnetic material in a substantially ring shape, and different magnetic pole surfaces are formed on the inner peripheral surface and the outer peripheral surface. That is, the magnet main body 210 is magnetized, for example, so as to have an N pole on the inner peripheral surface and an S pole on the outer peripheral surface. The magnet unit 200 and the magnetic body 300 constitute a magnetic circuit.
[0012]
The inner yoke 220 is formed in a substantially ring shape from a magnetic material such as a steel plate containing iron as a main component. The inner yoke 220 has an axial dimension that is substantially the same as or slightly longer than that of the magnet body 210, and one end surface in the axial direction is flush with one end surface of the magnet body 210 or is slightly displaced in the axial direction. The magnet body 210 is fitted and fixed in the state. The inner yoke 220 may be integrally joined to the magnet body 210 with an adhesive or the like.
[0013]
The outer yoke 230 is formed in a substantially ring shape with a magnetic material like the inner yoke 220. The outer yoke 230 has an outer periphery fitting portion 231 whose inner diameter is substantially the same as the outer diameter of the magnet body 210. At one end in the axial direction of the outer periphery fitting portion 231, a flange portion 232 that protrudes outward in a bowl shape is formed in a series. Further, a positioning fitting portion 233 that is bent in a cylindrical shape coaxial with the outer peripheral fitting portion 231 is bent in a series on the outer peripheral edge of the flange portion 232. The outer yoke 230 has a magnet body in a state where one end surface in the axial direction opposite to the side on which the flange portion 232 is provided is flush with the one end surface in the axial direction of the magnet body 210 or slightly shifted in the axial direction. The magnet part 200 is assembled and formed integrally in a state in which 210 is fitted and fixed to the inner peripheral surface. The magnet unit 200 is in a state in which a magnetic pole surface, that is, an N pole is formed on the inner peripheral surface of the inner yoke 220. The outer yoke 230 may be integrally joined to the magnet body 210 with an adhesive or the like.
[0014]
The magnetic body 300 is formed in a substantially ring shape with a magnetic material like the inner yoke 220 and the outer yoke 230, for example. The magnetic body 300 is formed in a substantially cylindrical shape whose outer diameter is substantially the same as the inner diameter of the positioning fitting portion 233 of the outer yoke 230. Outside A cylindrical portion 310 is provided. At one end of the outer cylinder portion 310 in the axial direction, a bridging portion 320 that is bent in an approximately arc shape on the inner peripheral side is formed in series. Furthermore, an outer diameter of the bridging portion 320 is formed in a substantially cylindrical shape whose outer diameter is smaller than the inner diameter of the inner yoke 220 of the magnet portion 200 by a predetermined dimension. Tauchi The cylindrical portion 330 is bent in a series. A plurality of substantially circular through holes 321 may be formed in the bridging portion 320.
[0015]
In the magnetic body 300, the end surface of the outer cylinder portion 310 opposite to the side on which the bridging portion 320 is provided contacts the flange portion 232 of the outer yoke 230 of the magnet portion 200, and the outer cylinder portion 310 is in contact with the magnet portion 200. The outer yoke 230 is connected to the positioning fitting portion 233 with an adhesive or the like. In addition, it is not restricted to the adhesion | attachment by an adhesive agent, You may connect by engaging the nail | claw part formed by cutting and raising, joining by welding, etc. The magnetic body 300 is connected to the outer yoke 230 of the magnet part 200, and the outer peripheral surface of the inner cylindrical part 330 faces the inner peripheral surface of the inner yoke 220 via a magnetic gap G having a predetermined gap size. A magnetic pole surface, that is, an S pole is formed on the outer peripheral surface of the inner cylindrical portion 330 to constitute a magnetic circuit.
[0016]
The vibration plate 400 is formed in a substantially thin film shape, for example, with a magnesium thin plate or a resin film whose surface has been subjected to an anti-corrosion treatment, and has a curved vibration portion 410 at a substantially center. On the periphery of the vibration part 410, a substantially cylindrical upright part 420 is bent and formed in a series on the side opposite to the side on which the vibration part 410 is curved. The upright portion 420 is formed so that the inner diameter is larger than the outer diameter of the magnetic inner cylinder portion 330 and the outer diameter is smaller than the inner diameter of the inner yoke 220 of the magnet portion 200. Further, at one end in the axial direction of the upright portion 420, a curved edge portion 430 that is curved in the same direction as the vibrating portion 410 in the outer circumferential direction is formed in a series of arcs. In addition, a holding portion 440 that protrudes outward in a bowl shape is formed in a series at the outer peripheral edge of the edge portion 430. The diameter of diaphragm 400 is formed to be approximately the same as the inner diameter of positioning fitting portion 233 of outer yoke 230 of magnet unit 200. Further, the width dimension in the radial direction of the holding part 440 is formed to be approximately the same as the thickness dimension of the outer cylinder part 310 of the magnetic body 300. In addition, you may comprise the vibration part 410, the edge part 430, and the standing part 420 separately, respectively. Moreover, the vibration part 410 and the upright part 420 may be comprised integrally, and the edge part 430 and the upright part 420 may be comprised integrally.
[0017]
When the diaphragm 400 is coupled to the magnet unit 200 of the magnetic body 300, the clamping unit 440 is clamped between the flange unit 232 of the outer yoke 230 of the magnet unit 200 and one end of the outer cylinder unit 310. The magnetic body 300 is assembled while being positioned and held. The assembled vibration plate 400 is positioned so that the upright portion 420 is movable in the axial direction without contacting between the inner yoke 220 of the magnet portion 200 and the inner cylindrical portion 330 of the magnetic body 300. The magnetic body 300 is disposed in a state of being located on the inner peripheral side of the inner cylindrical portion 330.
[0018]
The voice coil 500 is wound, for example, by winding a wire directly around the outer peripheral surface of the upright portion 420 of the diaphragm 400. It should be fixed with an adhesive or the like. Then, both ends of the wire are drawn out to the side opposite to the side to which the magnetic body 300, which is the lower side in FIG. 2, is connected, and serve as an input end of the audio signal. In addition, a voice coil may be fixed to the inner peripheral surface of the upright portion 420.
[0019]
(Assembly operation of speaker device)
Next, the assembly operation of the speaker device 100 will be described with reference to the drawings. 4A and 4B are explanatory views showing the assembly operation of the speaker device 100. FIG. 4A is an explanatory view showing a positioning process of the magnet main body 210, the inner yoke 220 and the outer yoke 230, and FIG. 4B is a positioning process of the diaphragm 400. (C) is an explanatory view showing the assembly process of the magnetic body 300, (D) is an explanatory view showing a completed state of the speaker device 100.
[0020]
First, an assembly jig 600 formed in advance is placed at a predetermined assembly position. As shown in FIG. 4, the assembly jig 600 is formed of, for example, a synthetic resin and has a mounting portion 610 on a substantially circular plate. A substantially cylindrical gap positioning portion 620 having a central axis passing through the center of the placement portion 610 is integrally projected on one surface of the placement portion 610. Further, the gap positioning portion 620 may be formed with a plurality of notches 621 that are recessed along the axial direction in a state of being divided into a plurality of portions.
[0021]
Then, as shown in FIG. 4 (A), the magnet part 200 that is assembled and formed integrally with the assembly jig 600 in advance is placed in a state where the gap positioning part 620 of the assembly jig 600 is fitted to the inner periphery. Place on top. Thereafter, an adhesive (not shown) is applied to the upper surface of the flange portion 232 of the outer yoke 230 of the magnet portion 200 placed on the placement portion 610.
[0022]
Further, as shown in FIG. 4B, the upright portion 420 of the diaphragm 400 around which the voice coil 500 is wound is inserted into a state where the outer periphery of the voice coil 500 is fitted to the inner periphery of the gap positioning portion 620. Let At this time, since the plurality of cut portions 621 are provided in the gap positioning portion 620, the frictional force is relatively reduced and the gap is relatively smoothly fitted. Further, the adhesive 440 that is applied in advance is superposed on the holding portion 440 that is the peripheral portion of the diaphragm 400 so as to be placed on the flange portion 232 while being fitted to the positioning fitting portion 233 of the outer yoke 230 of the magnet portion 200. To be joined.
[0023]
Thereafter, as shown in FIG. 4C, the end of the outer cylindrical portion 310 of the magnetic body 300 is fitted to the positioning fitting portion 233 of the outer yoke 230 of the magnet portion 200, while on the flange portion 232. The diaphragm 400 is fitted until it comes into contact with the holding portion 440 of the diaphragm 400, and the holding portion 440 of the diaphragm 400 is held by the flange portion 232 and the outer cylinder portion 310. In this state, the flange part 232 and the outer cylinder part 310 are joined by the adhesive previously applied.
[0024]
Then, as shown in FIG. 4D, the assembly jig 600 is attached from the side opposite to the side where the magnetic body 300 is joined so that the gap positioning portion 620 is pulled out from between the magnet portion 200 and the voice coil 500 of the diaphragm 400. The speaker device 100 is assembled and formed.
[0025]
(Effects of speaker device)
As described above, in the first embodiment, the holding part 440 at the peripheral part of the diaphragm 400 integrally provided with the voice coil 500 is positioned and held, and the magnet part 200 is provided on one magnetic pole surface of the magnet part 200. The outer cylinder part 310 of the magnetic body 300 is joined via the outer yoke 230 that constitutes the outer periphery of the magnetic body 300, and the bridging part 320 that continues from the outer cylinder part 310 of the magnetic body 300 to the inner peripheral side covers the edge part 430 of the diaphragm 400. The magnetic gap that interposes the voice coil 500 in the radial direction of the magnet part 200 so that the inner coil part 330 of the magnetic body 300 continuing to the bridging part 320 faces the inner peripheral side of the voice coil 500 is movable. G is formed to form a magnetic circuit. For this reason, the magnetic body 300 enters a dome shape from the outer peripheral side of the diaphragm 400 to the inner peripheral side of the voice coil 500 through the surface of the edge portion 430, and the magnet unit 200 is positioned on the outer peripheral side of the voice coil 500. Since the amplitude of the vibration plate 400 is relatively narrow particularly in the case where it is used for a portable electric device, even if the distance between the edge portion 430 and the magnetic body 300 is reduced, the vibration portion 410 is sufficiently formed. Sound generation by vibration is obtained, the dimension in the thickness direction can be reduced, and a reduction in thickness can be easily obtained. In addition, since the magnetic body 300 is located in a dome shape on the surface side where the sound is generated, by characterizing the shape of the inner cylindrical portion 330, for example, acoustic characteristics such as horn effect and tube resonance can be easily performed without using other members. The versatility can be improved.
[0026]
The diaphragm 400 is formed by providing a series of substantially cylindrical upstanding portions 420 from the vibrating portion 410 and providing a series of peripheral edge portions 430 from the upstanding portion 420. For this reason, the voice coil 500 can be directly wound around the outer peripheral surface of the upright portion 420 of the diaphragm 400, so that the productivity can be improved and the diaphragm can be used without using a bobbin around which the voice coil 500 is wound. 400 can be integrally provided, and the configuration can be simplified, and the size and weight can be reduced and the cost can be reduced easily. Further, the standing portion 420 can easily obtain a state in which the magnetic body 300 wraps around the inner periphery of the voice coil 500, and can easily be reduced in thickness without making the diaphragm 400 and the magnetic body 300 complex. Manufacturability can be easily improved. A voice coil wound in advance may be fixed to the inner peripheral surface of the upright portion 420 with a fixing member such as an adhesive.
[0027]
Further, a gripping portion 440 that protrudes outward from the outer peripheral edge of the edge portion toward the outer peripheral edge of the diaphragm 400 and is positioned and held by the magnetic body 300, that is, held by the outer yoke 230 of the magnet portion 200, is provided. It is provided in a series. For this reason, the diaphragm 400 can be easily positioned and held by the magnetic body 300, that is, the diaphragm 400 can be easily positioned and held by holding the diaphragm 400 with the outer yoke 230 constituting the magnet unit 200. Manufacturability can be easily improved with a simple configuration.
[0028]
Further, since the peripheral edge portion of the diaphragm 400 is held by the outer yoke 230 of the magnet portion 200 at one end face of the outer cylinder portion 310 of the magnetic body 300, the positioning and holding of the diaphragm 400 can be suppressed while suppressing an increase in the radial dimension. Can be easily reduced in size.
[0029]
The diaphragm 400 can be easily positioned by forming the diameter of the diaphragm 400 to be substantially the same as the inner diameter of the positioning fitting portion 233 of the outer yoke 230 of the magnet unit 200, such as a boss for positioning. The voice coil 500 can be easily positioned at a predetermined position of the magnetic gap G without providing a special configuration, and the productivity can be easily improved with a simple configuration.
[0030]
Further, the inner yoke 220 is fitted to the inner circumference side of the ring-shaped magnet body 210 having different poles in the radial direction, that is, different magnetic pole faces on the outer circumference surface and the inner circumference surface, and the outer yoke 230 is fitted on the outer circumference side. Thus, the magnetic circuit before the magnetic body 300 is attached is integrally formed. For this reason, as a configuration for positioning and holding the peripheral portion of the vibration plate 400, it is possible to obtain a simple configuration in which the magnetic body 300 and the outer yoke 230 are clamped and fixed. It is easy to obtain a magnetic circuit by forming the magnetic gap G in a state in which the magnetic wrap around and is located on the inner peripheral side of the voice coil 500 with a simple configuration.
[0031]
Furthermore, as a configuration of the magnetic body 300 that covers the edge portion 430 of the diaphragm 400 continuously to one magnetic pole surface of the magnet portion 200 and goes around to the inner peripheral side of the voice coil 500, the magnetic body 300 is joined to the outer yoke 230 of the magnet portion 200. A bridge that covers the edge portion 430 of the diaphragm 400 between the end portion of the outer cylinder portion 310 and the end portion of the inner cylinder portion 330 that is smaller in diameter than the outer cylinder portion 310 and whose outer peripheral surface faces the inner periphery of the voice coil 500. The unit 320 is connected in series. For this reason, it can be easily formed with a simple configuration, for example, by pressing a steel plate, the manufacturability can be easily improved, and a thin shape can be easily obtained.
[0032]
In addition, a positioning fitting portion 233 is provided on the outer yoke 230 of the magnet portion 200, and when the magnetic body 300 is coupled, the magnetic body 300 is positioned and fitted so that the centers are positioned concentrically with each other. For this reason, the assembly work for obtaining the predetermined magnetic gap G can be easily performed, and the productivity can be easily improved with a simple configuration. Further, the diaphragm 400 can be positioned by the positioning fitting portion 233, and the productivity can be easily improved with a simpler configuration.
[0033]
Then, a through hole 321 is provided in the bridging portion 320 of the magnetic body 300 facing the edge portion 430 of the diaphragm 400. For this reason, since the air between the bridging portion 320 and the edge portion 430 communicates with the outside through the through hole 321, the edge portion 430 of the diaphragm 400 vibrates in conjunction with the movement of the voice coil 500 during sound generation. At this time, it is possible to prevent the air between the bridging portion 320 and the edge portion 430 from being pressurized and depressurized to restrict the vibration of the edge portion 430, and to obtain a good vibration of the diaphragm 400, and to reproduce the audio signal well Output is obtained.
[0034]
[Second Embodiment]
Next, a second embodiment, which is another embodiment of the speaker device of the present invention, will be described with reference to FIG. The second embodiment shown in FIG. 5 is obtained by changing the magnetization direction of the magnet unit 200 in the first embodiment. FIG. 5 is a cross-sectional view showing the speaker device according to the second embodiment. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The same applies to the third embodiment described below.
[0035]
(Configuration of speaker device)
In FIG. 5, reference numeral 700 denotes a speaker device. The speaker device 700 includes a magnet unit 800, a magnetic body 900, and a diaphragm 400 and a voice coil 500 similar to those in the first embodiment.
[0036]
The magnet unit 800 includes a magnet body 810, a connecting yoke 820, and a magnetic pole forming yoke 830. The magnet body 810 is formed of a magnetic material in a substantially ring shape, and different magnetic pole faces are formed on both end faces in the axial direction. That is, the magnet body 810 is magnetized so that, for example, the axial end surface on the upper side in FIG. 5 is an N pole and the axial end surface on the lower side in FIG.
[0037]
The connecting yoke 820 is formed in a substantially ring shape from a magnetic material such as a steel plate containing iron as a main component. The connecting yoke 820 has an inner diameter and an outer diameter that are substantially the same as those of the magnet body 810, and is integrally joined to one end surface, which is an upper surface in the axial direction, with an adhesive or the like. Further, the connecting yoke 820 is formed to be inclined so that the inner peripheral surface expands toward one side in the axial direction. The connecting yoke 820 is integrally joined to the magnet main body 810 with an adhesive, for example, so that the inner peripheral surface expands upward. In this joined state, the corner of the magnet body 810 and the corner of the connecting yoke 820 are continuous, and the inner peripheral surface of the magnet body 810 and the inner peripheral surface of the connecting yoke 820 are continuous at an obtuse angle. . In addition, when the area which contacts the magnet main body 810 of the clamping part 440 is fully ensured, the connection yoke 820 may be abbreviate | omitted and the clamping part 440 may be contact | abutted directly to the magnet main body 810. FIG.
[0038]
The magnetic pole forming yoke 830 is formed in a substantially ring shape from a magnetic material like the connecting yoke 820. The magnetic pole forming yoke 830 has a ring-shaped holding plate portion 831 whose inner diameter is smaller than the inner diameter of the magnet body 810 and whose outer diameter is substantially the same as the outer diameter of the magnet body 810. A substantially cylindrical magnetic pole forming portion 832 having a central axis that is coaxial with the central axis of the clamping plate portion 831 is formed in a series at the inner peripheral edge of the clamping plate portion 831. Further, the upper end surface, which is one end in the axial direction, of the magnetic pole forming portion 832 is formed in a state of being inclined outward. The magnetic pole forming yoke 830 is integrally joined with an adhesive so that the outer peripheral edge is continuous with the outer peripheral edge of the magnet main body 810 and the holding plate portion 831 and the connecting yoke 820 hold the magnet main body 810. In this joined state, the magnetic pole forming portion 832 is separated from the inner peripheral surface of the magnet main body 810, and the distal end portion is gradually separated from the magnet main body 810 and the connecting yoke 820 by the inclined end surface which is the distal end surface. The opposing corners are in an obtuse angle.
[0039]
As shown in FIG. 5, in the magnetic body 900, the gripping hook portions 910 are bent in series in a bowl shape toward the outer side at the lower edge of the outer yoke 230 in the magnetic body 300 of the first embodiment. It is formed into a shape. Note that the gripper 910 is formed so that the outer diameter of the magnetic body 900 is approximately the same as the outer diameter of the magnet part 200.
[0040]
In the magnetic body 900, the gripping hook portion 910 is integrally connected to the upper surface of the connecting yoke 820 of the magnet portion 200 with, for example, an adhesive. In addition, it is not restricted to the adhesion | attachment by an adhesive agent, You may connect by engaging the nail | claw part formed by cutting and raising, joining by welding, etc. In the magnetic body 900, the outer peripheral surface of the inner cylindrical portion 330 is opposed to the inner peripheral surface of the magnetic pole forming portion 832 of the magnetic pole forming yoke 830 through a magnetic gap G having a predetermined gap size in a state where it is connected to the magnet portion 200. To do. Thus, a magnetic pole surface, that is, an N pole is formed on the outer peripheral surface of the inner cylindrical portion 330, and an S pole is formed on the inner peripheral surface of the magnetic pole forming portion 832, thereby forming a magnetic circuit. Since the inner peripheral surface of the connecting yoke 820 of the magnet unit 200 is inclined and the tip surface of the magnetic pole forming unit 832 of the magnetic pole forming yoke 830 is inclined, the magnetic flux is transferred from the tip of the magnetic pole forming unit 832 to the connecting yoke 820 and the magnet body 810. Is suppressed from leaking.
[0041]
Further, the holding part 440 of the diaphragm 400 is wider than that of the first embodiment, and the diameter dimension of the diaphragm 400 is formed to be approximately the same as the outer diameter of the magnet part 200. That is, the width dimension of the holding part 440 in the radial direction is formed by subtracting the inner diameter of the outer cylinder part 310 of the magnetic body 900 from the outer diameter of the magnetic body. Thus, the outer peripheral surface of the edge portion 430 is positioned on the inner peripheral surface of the outer cylindrical portion 310 when the magnetic body 900 is bonded to the magnet portion 200.
[0042]
(Assembly operation of speaker device)
Next, the assembly operation of the speaker device 700 will be described.
An assembly jig 600 similar to that of the first embodiment described above is arranged at a predetermined assembly position. Then, the magnet portion 800 that is assembled and integrated integrally with the assembly jig 600 is placed on the placement portion 610 so that the gap positioning portion 620 of the assembly jig 600 is fitted to the inner periphery. Thereafter, an adhesive (not shown) is applied to the upper surface of the connecting yoke 820 of the magnet unit 800.
[0043]
Thereafter, the upright portion 420 of the diaphragm 400 around which the voice coil 500 is wound is inserted into a state where the outer periphery of the voice coil 500 is fitted into the inner periphery of the gap positioning portion 620. And the clamping part 440 used as the periphery of the diaphragm 400 is superimposed on the connection yoke 820 of the magnet part 800, and it joins with the adhesive previously apply | coated. Thereafter, an adhesive is further applied to the upper surface of the holding part 440.
[0044]
Then, the gripping part 910 of the magnetic body 900 is attached to the gripping part 440 of the diaphragm 400 adhered to the magnet part 800 so that the outer peripheral edge is flush with the outer peripheral edge of the gripping part 440 and the outer peripheral edge of the magnet part 800. Superimpose and bond with pre-applied adhesive. When the magnetic body 900 is joined, the outer peripheral surface of the edge portion 430 of the vibration plate 400 is positioned at the lower end edge of the outer cylinder portion 310 of the magnetic body 900. As a result, the voice coil 500 is placed at a predetermined position between the inner cylinder portion 330 and the magnetic pole forming portion 832 of the magnet portion 200. Thereafter, the assembly jig 600 is removed in the same manner as in the first embodiment, and the speaker device 700 is assembled and formed.
[0045]
(Effects of speaker device)
As described above, in the second embodiment, similarly to the first embodiment, the magnetic body 900 is joined to one magnetic pole surface of the magnet unit 800 via the connecting yoke 820, and the diaphragm 400. The edge portion 430 is covered and provided so as to wrap around the inner peripheral side of the voice coil 500. For this reason, similarly to the first embodiment, the thickness can be easily reduced. Further, by characterizing the shape of the inner cylindrical portion 330 of the magnetic body 900, for example, acoustic characteristics such as horn effect and tube resonance can be easily adjusted without using other members, and versatility can be improved.
[0046]
Further, a gripping hook portion 910 that is clamped and fixed to the magnetic body 900 by the magnet portion 800 is provided. For this reason, the magnetic body 900 can be reliably joined, a favorable magnetic circuit can be obtained, and the diaphragm 400 can be reliably fixed.
[0047]
Then, the diaphragm 400 is formed so that the diameter dimension is substantially the same as the outer diameter of the magnet part 200, and the width dimension in the radial direction of the holding part 440 is changed from the outer diameter of the magnetic body to the inner diameter of the outer cylinder part 310 of the magnetic body 900. The dimension is formed by subtracting. For this reason, when joining the magnetic body 900 to the magnet portion 200, the outer peripheral surface of the edge portion 430 is positioned on the inner peripheral surface of the outer cylinder portion 310, and the voice coil 500 is not provided with a special configuration. Can be easily arranged at a predetermined position.
[0048]
Furthermore, since the outer diameter of the magnetic body 900 is the same as the outer diameter of the magnet portion 800, the center of the magnetic body 900 and the magnet portion 800 can be easily positioned on the concentric axis, improving the manufacturability. In addition, an appropriate magnetic gap G can be assembled and formed by a simple operation for confirming the state of the outer peripheral edge when the magnetic body 900 is joined.
[0049]
Since the inner peripheral surface of the connecting yoke 820 of the magnet unit 800 is inclined, the magnetic flux can be prevented from leaking from the magnetic pole forming unit 832 to the connecting yoke 820, and a good magnetic circuit can be obtained with a simple configuration. Furthermore, since the tip end surface of the magnetic pole forming portion 832 is also inclined, the leakage of magnetic flux can be prevented and a better magnetic circuit can be obtained. Further, since the inner peripheral edge of the connecting yoke 820 is joined to the inner peripheral edge of the magnet main body 810 in a continuous manner, the corner of the magnet main body 810 is not exposed, and the magnetic flux is transferred from the tip of the magnetic pole forming portion 832 to the corner of the magnet main body 810. Can be further prevented, and a better magnetic circuit can be obtained.
[0050]
[Third Embodiment]
Next, a third embodiment, which is another embodiment of the speaker device of the present invention, will be described with reference to FIGS. In the third embodiment shown in FIG. 6, the ring-shaped magnet portion 200 in the first embodiment described above is changed to a rod-shaped magnet. FIG. 6 is a plan view showing the speaker device according to the third embodiment, and FIG. 7 is a cross-sectional view taken along one-dot chain line AA in FIG.
[0051]
(Configuration of speaker device)
In FIG. 6, 100A is a speaker device, and this speaker device 100A includes a magnet unit 200A, a magnetic body 300A, a diaphragm 400A, and a voice coil 500A.
[0052]
The magnet unit 200A includes a magnet body 210A, an inner yoke 220A, and an outer yoke 230A. The magnet body 210A is formed of a magnetic material in the form of a rod having a longitudinal direction, and has different magnetic poles on the inner surface (the surface facing the center position of the speaker device 100A) and the outer surface (the surface facing the outside of the speaker device 100A). A surface is formed. That is, the magnet main body 210A is magnetized, for example, in a state of N pole on the inner side and S pole on the outer side, and a magnetic circuit is formed between the magnet part 200A and the magnetic body 300A.
[0053]
The inner yoke 220A is formed in a rod-like flat plate having a longitudinal direction with a magnetic material such as a steel plate containing iron as a main component. The inner yoke 220A has an axial dimension slightly longer than that of the magnet body 210A, and an adhesive or the like is attached to the inner surface of the magnet body 210A with one end face in the axial direction being flush with one end face of the magnet body 210A. It is fixed with the adhesive means.
[0054]
The outer yoke 230A is made of a magnetic material, like the inner yoke 220A. The outer yoke 230A includes linear portions 233A that face each other and an arc portion 234A that connects these linear portions 233A. The outer yoke 230A has an outer fixing portion 231A that is fixed to the magnet body 210A. At one end in the axial direction of the outer fixing portion 231A, a flange portion 232A protruding outward in a bowl shape is formed in a series. The linear portion 233A of the outer yoke 230A is fixed to the magnet body 210A in a state where one end surface in the axial direction opposite to the side where the flange portion 232A is provided is flush with one end surface in the axial direction of the magnet body 210A. The magnet portion 200A is assembled and formed integrally. The magnet unit 200 forms a magnetic pole surface, that is, an N pole, on the inner side surface of the inner yoke 220A, and forms a magnetic pole surface, that is, an S pole, on the outer surface of the outer yoke 230A. The speaker device 100A is provided with a pair of such bar-shaped magnet portions 200A at positions facing each other.
[0055]
The magnetic body 300A is formed of a magnetic material in a substantially rod shape. The magnetic body 300A is formed at the upper part in the axial direction of the outer yoke 230A. As the outer cylinder It has an outer frame portion 310A. At the lower end in the axial direction of the outer frame portion 310A, a pressing portion 311A that protrudes outwardly in a hook shape is bent in a series. The other end of the outer frame portion 310A is formed with a series of bridging portions 320A bent inward in a substantially arc shape. Further, an end portion opposite to the side where the outer frame portion 310A of the bridging portion 320A is formed is formed in a substantially rod-like flat plate inside a predetermined dimension from the inner side surface of the inner yoke 220A of the magnet portion 200A. As the inner cylinder The inner frame portion 330A is bent and formed in series. In addition, a plurality of substantially circular through holes 321 are formed in the bridging portion 320A.
[0056]
In the magnetic body 300A, the pressing portion 311A of the outer frame portion 310A is in contact with the flange portion 232A of the outer yoke 230A of the magnet portion 200A and is fixed by an adhesive. In addition, it is not restricted to the adhesion | attachment by an adhesive agent, You may connect by engaging the nail | claw part formed by cutting and raising, joining by welding, etc. In the state where the magnetic body 300A is connected to the magnet portion 200A, the outer surface of the inner frame portion 330A faces the inner surface of the inner yoke 220A via a magnetic gap G having a predetermined gap size, and the inner frame portion 330A A magnetic pole surface, that is, an S pole is formed on the outer side surface to constitute a magnetic circuit.
[0057]
The vibration plate 400A is formed in a substantially thin film shape using, for example, a magnesium thin plate or a resin film whose surface is subjected to a touch-proof treatment. The diaphragm 400A is formed in an oval shape having a longitudinal direction in accordance with the rod-like shapes of the magnet part 200A and the magnetic body 300A, and the magnet part 200A and the magnetic body 300A are respectively located at positions corresponding to two sides along the longitudinal direction. Is arranged. A curved vibrating portion 410A is provided at the approximate center of the vibration plate 400A. A substantially cylindrical upright portion 420A is bent and formed in a series on the periphery of the vibrating portion 410A on the side opposite to the side on which the vibrating portion 410 is curved. The upright portion 420A is formed so as not to contact between the outer surface of the magnetic inner frame portion 330A and the inner surface of the inner yoke 220A of the magnet portion 200A. Further, at one end in the axial direction of the upright portion 420A, an edge portion 430A having a curved shape that curves in the same direction as the vibrating portion 410A is bent in a series of arcs. In addition, a holding portion 440A that protrudes outwardly in a hook shape is bent in a series on the outer periphery of the edge portion 430A. In addition, you may comprise the vibration part 410A, the edge part 430A, and the upright part 420A separately. Moreover, the vibration part 410A and the upright part 420A may be integrally configured, or the edge part 430A and the upright part 420A may be integrally configured.
[0058]
The voice coil 500 </ b> A is wound by winding a wire, for example, directly on the outer surface of the upright portion 420 of the diaphragm 400. It should be fixed with an adhesive or the like. Then, both ends of the wire are drawn out to the side opposite to the side to which the magnetic body 300 is connected, and serve as an input end for the audio signal.
[0059]
Further, in the arc portion 234A where the magnet body 210A of the outer yoke 230A is not disposed, the diaphragm 400A is formed in an arc shape in the plane direction. The voice coil 500A has a straight line portion where the magnet main body 210A and the magnetic body 300A are disposed, and the diaphragm 400A is disposed along the rod-shaped magnet main body 210A and hits the arc portion 234A of the outer yoke 230A. It is formed in an arc shape according to the shape of the upright portion 420A.
The holding portion 440A of the vibration plate 400A is sandwiched and fixed between the flange portion 232A of the outer yoke 230A and the pressing portion 311A of the outer frame portion 310A in the linear portion 233A where the magnet main body 210A and the magnetic body 300A are arranged. Then, it is fixed to the outer yoke 230A by means such as adhesion. Further, a holder that covers the outer yoke 230A and clamps the diaphragm 400A in the arc portion may be used.
[0060]
(Effects of speaker device)
Similar to the operation and effect of the first embodiment described above, the magnetic body 300A is joined to one magnetic pole surface of the magnet part 200A via the outer yoke 230A, covers the edge part 430A of the diaphragm 400A, and covers the voice coil 500. Provided to wrap around inside. Thus, similar to the first embodiment, the thickness can be easily reduced, and the shape of the inner frame portion 330A can be characterized to adjust the acoustic characteristics such as horn effect and tube resonance without using other members. it can.
[0061]
Further, since the rod-shaped magnet portion 200A is used in the third embodiment, it is easier to process and the processing cost is lower than that of the ring-shaped magnet. Thereby, in 3rd Embodiment, the effort and cost concerning a production can be reduced.
[0062]
Further, since the voice coil 500A is wound around the upright portion 420A of the diaphragm 400A in a shape having a straight line portion, the voice coil 500A straight line portion and the straight line portion of the rod-shaped magnet portion 200A are arranged in correspondence with each other. Can do. As a result, since the voice coil 500A can be kept at a constant distance from the magnetic pole surface of the magnet portion 200A without bending, a good magnetic circuit can be maintained.
[0063]
And since a pair of rod-shaped magnet part 200A is opposingly arranged, the magnetic circuit formed by these magnet parts 200A becomes a contrasting form, and the same left-right symmetrical by the electric signal which flows into voice coil 500A Since vibration can be obtained, good vibration of the diaphragm 400A can be obtained, and good reproduction output of an audio signal can be obtained.
[0064]
The diaphragm 400A is formed in an oval shape having a longitudinal direction and a direction orthogonal to the longitudinal direction in accordance with the shape of the voice coil 500A and the shape of the magnet portion 200A. It can be assembled easily, for example, it can be easily combined.
[0065]
[Fourth Embodiment]
Next, a fourth embodiment, which is another embodiment of the speaker device of the present invention, will be described with reference to FIGS. 8 is a plan view showing the speaker device according to the fourth embodiment, FIG. 9 is a cross-sectional view taken along a dashed-dotted line BB in FIG. 8, and FIG. 10 is a cross-sectional view taken along a dashed-dotted line CC in FIG. It is.
[0066]
(Configuration of speaker device)
In the speaker device of the third embodiment, the voice coil is formed in a substantially rectangular shape in a plane, which is the fourth embodiment. In FIG. 8, in the speaker device 100B, the voice coil 500B is formed in a rectangular shape, and rod-shaped magnet portions 200A and 200B are arranged at positions corresponding to the four sides of the rectangular shape. That is, a pair of rod-shaped magnet portions 200A opposed to the longitudinal direction of the rectangle are arranged, and a pair of opposed rod-shaped magnet portions 200B are arranged in a direction orthogonal to the longitudinal direction. These magnet parts 200B are arranged on both ends of the magnet part 200A and are designed to be smaller than the length of the magnet part 200A. The description of the magnet part 200A is omitted because it is the same as that of the third embodiment described above, and the direction perpendicular to the longitudinal direction in which the magnet part 200B is disposed will be described below.
[0067]
The magnet unit 200B includes a magnet body 210B, an inner yoke 220B, and an outer yoke 230B. The magnet body 210B is formed of a magnetic material in a rod shape, and magnetic pole surfaces that are the same as the magnet body 210A are formed on the inner surface and the outer surface. That is, for example, if the magnet body 210B is magnetized with the N pole on the inner surface of the magnet body 210A and the S pole on the outer surface, the magnet body 210B has the N pole on the inner surface and the S pole on the outer surface. Is magnetized.
[0068]
The inner yoke 220B is a member formed in the same manner as the inner yoke 220A described in the third embodiment. However, since the length of the magnet body 210B to be fixed is smaller than the length of the magnet body 210A, The longitudinal dimension of the inner yoke 220B is also set smaller than the longitudinal dimension of the inner yoke 220A.
[0069]
The outer yoke 230B includes linear portions 233A that face each other and an arc portion 234B that connects the linear portions 233A. The outer yoke 230B includes an outer fixing portion 231A that is fixed to the magnet body 210A and an outer fixing portion 231B that is fixed to the magnet body 210B. Flange portions 232A and 232B projecting outwardly in a hook shape are bent in a series at one end in the axial direction of the outer fixing portions 231A and 232B. At this time, the flange portion 232B in the arc portion 234A is formed larger outside than the flange portion in the straight portion 233A so that the holding portion 440A of the diaphragm 400B can be bonded and fixed to the flange portions 232A and 232B. Yes.
[0070]
At the upper part in the axial direction of the outer fixing portion 231B of the outer yoke 230B, the magnetic body 300B As an external cylinder part The outer frame part 310B Arranged . At the lower end in the axial direction of the outer frame portion 310B, a pressing portion 311B that protrudes outwardly in a hook shape is bent in a series. The pressing portion 311B has a shape that protrudes greatly to the outside, and is formed so as to be joined to the flange portion 232B of the outer yoke 230B. At the other end of the outer frame part 310B, a bridging part 320B bent inward in a substantially arc shape is formed in series, and further inside the bridging part 320B, As the inner cylinder The inner frame portion 330B is bent and formed in a series. In the magnetic body 300B, the outer peripheral surface of the inner frame portion 330B is opposed to the inner peripheral surface of the inner yoke 220B through a magnetic gap G having a predetermined gap size in a state of being connected to the outer yoke 230B of the magnet portion 200B. A magnetic pole surface, that is, an S pole is formed on the outer peripheral surface of the inner frame portion 330B to constitute a magnetic circuit.
[0071]
The diaphragm 400B is formed in a substantially thin film shape using, for example, a magnesium thin plate or cone paper whose surface has been subjected to anti-corrosion treatment. The diaphragm 400B is formed in an oval shape having a longitudinal direction in accordance with the rod-like shapes of the magnet part 200A and the magnetic body 300A. A vibration part 410B having a curved surface is provided at substantially the center of the vibration plate 400B. The vibrating portion 410B is formed in a substantially rectangular shape, and a substantially cylindrical upright portion 420B is bent and formed in a series on the periphery of the vibrating portion 410B on the side opposite to the side on which the vibrating portion 410B is curved. The upright portion 420B is formed so as not to contact between the outer side surfaces of the inner frame portions 330A and 330B of the magnetic body and the inner side surfaces of the inner yokes 220A and 220B of the magnet portions 200A and 200B. Further, at one end in the axial direction of the upright portion 420B, an edge portion 430B having a curved shape that curves in the same direction as the vibrating portion 410B outwardly is bent in a series of arcs. In addition, a holding portion 440B that protrudes outward in a hook shape is formed in a series on the outer periphery of the edge portion 430B. In addition, you may comprise the vibration part 410B, the edge part 430B, and the upright part 420B separately, respectively. Moreover, the vibration part 410B and the upright part 420B may be comprised integrally, and the edge part 430B and the upright part 420B may be comprised integrally.
[0072]
(Effects of speaker device)
Similar to the effects of the first embodiment described above, the magnetic bodies 300A and 300B are joined to one of the magnetic pole surfaces of the magnet portions 200A and 200B via the outer yoke 230B to cover the edge portion 430B of the diaphragm 400B. Are provided so as to wrap around the voice coil 500B. Thus, similar to the first embodiment, it can be easily reduced in thickness, and the acoustic characteristics such as horn effect and tube resonance are prepared without using other members by characterizing the shapes of the inner frame portions 330A and 330B. Can be adjusted.
[0073]
In addition, the voice coil 500B is formed in a rectangular shape, a pair of rod-shaped magnet portions 200A facing each other in the longitudinal direction of the rectangle is provided, and a pair of rod-shaped magnet portions 200B facing each other in a direction orthogonal to the longitudinal direction. It is provided on both ends of the magnet part 200A. As a result, it is easier to create than when a ring-shaped magnet is used, and a magnetic circuit can be formed on the entire circumference of the voice coil 500B by the rod-shaped magnet, so that a good sound reproduction output can be obtained. be able to.
[0074]
[Modification of Embodiment]
In addition, this invention is not limited to each embodiment mentioned above, The deformation | transformation shown below is included in the range which can achieve the objective of this invention.
[0075]
That is, the configuration of the magnet units 200 and 800 is not limited to the configuration described above, and can be changed as appropriate. For example, as described above, the connecting yoke 820 may not be provided. Further, the magnetic bodies 300 and 900 can be changed to any shape that is connected to one of the magnetic pole surfaces of the magnet portions 200 and 800 and goes around the inner periphery of the voice coil 500. For example, in the second embodiment, when the end portion of the outer cylindrical portion 310 of the magnetic body 900 can be sufficiently joined, the gripping hook portion 910 may not be provided, or the flange portion 232 may not be provided. . Furthermore, also in the first embodiment, the positioning fitting portion 233 may not be provided if positioning can be easily performed by an assembly jig or the like.
[0076]
For example, as shown in FIG. 11, the positioning yoke is not provided in the outer yoke 230 of the magnet unit 200 in the first embodiment, and the diaphragm 400 is held using the magnetic body 900 in the second embodiment. It may be fixed.
[0077]
For example, as shown in FIG. 11, the magnetic body 300 may be provided with a configuration capable of obtaining acoustic characteristics such as a bass reflex effect, a horn effect, and tube resonance. That is, taking FIG. 11 as an example, reference numeral 950 denotes a cover portion, and the cover portion 950 has a plate portion 951 formed in a substantially disc shape by, for example, a steel plate. On the periphery of the plate portion 951, a joint portion 952 that is bent to be inclined toward one surface and joined to the magnetic body 900 is provided. Further, a plurality of circular holes 953A are formed in the plate portion 951. A series of substantially cylindrical ducts 953 led out to the side where the joint portion 952 is bent are provided at the inner peripheral edge of the circular hole 953A. The cover portion 950 is attached to the magnetic body 900 integrally with the end portion of the joining portion 952 joined to the bridging portion 320 of the magnetic body 900 by welding or the like in a state where the duct 953 protrudes toward the diaphragm 400. . The through hole 321 provided in the magnetic body 900 is preferably provided in a state facing the space defined by the cover portion 950 and the diaphragm 400. According to such a configuration, the edge portion 430, the magnetic body 900, Can be used as a volume that resonates with the duct 953, so that the bass reflex effect can be produced, and more appropriate acoustic characteristics can be obtained.
[0078]
Further, the cover portion 950A in FIG. 6 has a plate portion 951A formed in a substantially rectangular shape. The peripheral edge of the plate portion 951A is joined to the magnetic body 300A and connects the magnetic bodies 300A facing each other. In particular, as in the third embodiment, the speaker device 100A in which the pair of rod-shaped magnet portions 200A are opposed to each other is weakened by pressure in a direction perpendicular to the longitudinal direction of the speaker device. By connecting between 300A, the speaker device 100A can be reinforced and the diaphragm 400A can be protected. Further, the hole 954 provided in the cover part 950A is a hole for transmitting sound vibration generated from the speaker device 100A to the outside.
[0079]
Thus, since the magnetic bodies 300 and 900 cover the edge portion 430 and wrap around the inner peripheral side of the voice coil 500, the cover portion 950 on the substantially disk can be easily attached, and the productivity is improved. The vibration plate 400 can be protected with a simple configuration. Furthermore, it is possible to easily impart acoustic characteristics with a simple configuration in which the substantially cylindrical horn portion 953 is provided in the cover portion 950. In addition, when using the cover part 950 only as a cover of the diaphragm 400, it is preferable to make the board part 951 into a structure that ensures sound propagation, for example, by using a punching metal or mesh structure.
[0080]
Furthermore, the structure which joins the magnetic bodies 300 and 900 and the magnet parts 200 and 800 may be any method. For example, as shown in FIG. 12, if a sufficient positioning coercive force is obtained, the width dimension of the gripping portion 440 of the diaphragm 400 is reduced, and the gripping hook portion 910 of the magnetic body 300 and the magnet portion 800 are connected. A part of the yoke 820 may be directly joined. In this case, for example, by providing a level difference in the thickness of the gripping part 440 in the gripping part 910, positioning can be facilitated and adhesion between the gripping part 910 and the connecting yoke 820 is improved. According to the configuration shown in FIG. 12, since the magnetic body 300 and the magnet portion 800 are directly joined, leakage of magnetic flux can be prevented and a good magnetic circuit can be obtained. A step corresponding to the thickness of the holding portion 440 may be provided on the connecting yoke 820 or on both sides.
[0081]
In addition, the magnetic body 300, 900 and the magnet part 200, 800 have been described by holding and positioning and holding the peripheral edge of the diaphragm 400, but not limited to the configuration of holding and holding by this clamping and fixing, For example, the magnetic body 300, 900 may be configured to position and hold the diaphragm 400, and the magnetic body 300, 900 may be directly positioned to hold the diaphragm 400.
[0082]
As described above, the speaker devices 100 and 700 are not limited to those used for portable electric devices.
[0083]
Further, when assembling and forming the speaker devices 100 and 700, the assembly jig 600 may not be used. The assembly jig 600 is not limited to the above configuration. For example, when using the magnetic body 900, you may use jigs, such as the structure which further provided the member which positions the outer peripheral surface of the magnet parts 200 and 800 in the state where the outer periphery of the magnetic body 900 continues. Furthermore, it is good also as a structure which does not have the notch | incision part 621, the positioning part 620 was formed in the substantially cylindrical shape, and was projected in multiple numbers on the circumference.
[0084]
Further, a dustproof member such as a net, a woven fabric, or a non-woven fabric may be provided on the side where the assembly jig 600 opposite to the side on which the magnetic bodies 300 and 900 are attached, which is the back side of the speaker devices 100 and 700. .
[0085]
Further, although the voice coil 500 is wound around the outer peripheral surface of the upright portion 420 of the diaphragm 400, for example, it may be wound around the inner peripheral surface of the upright portion 420.
[0086]
Further, in the third and fourth embodiments, the planar shape of the diaphragms 400A and 400B is an oval shape, but may be a rectangular shape, an elliptical shape, a substantially polygonal shape such as a triangular shape or a hexagonal shape, or the like. As long as it is formed in a closed shape. Similarly, for the voice coils 500A and 500B, for example, the shape in the planar direction may be a rectangular shape, an elliptical shape, a substantially polygonal shape such as a triangular shape or a hexagonal shape, that is, as long as it is formed in a closed shape. Good. When the voice coil is formed in a planar elliptical shape, an elliptical magnet may be used, or a combination of an arc-shaped magnet and a rod-shaped magnet may be used. When the voice coil is formed in a substantially polygonal shape in a plane, a bar magnet can be installed at a position corresponding to each side.
[0087]
In addition, in the first and second embodiments, ring-shaped magnets are used, and in the third and fourth embodiments, rod-shaped magnets are used. However, these ring-shaped magnets and rod-shaped magnets are combined. The shape of these magnets is not particularly particular. For example, a speaker device that can form a magnetic circuit over a front circumference portion using an oval speaker device having a longitudinal direction using a rod-shaped magnet in a linear portion and a semicircular magnet in an arc portion. Also good.
[0088]
In the first, third, and fourth embodiments and FIGS. 3, 7, and 9, the magnet portions 200, 200A, and 200B include inner yokes 220, 220A, and 220B and magnet bodies 210, 210A, Although 210B and the outer yokes 230, 230A, 230B are formed so that one end surfaces in the axial direction are flush with each other, the present invention is not limited to this. That is, for example, as shown in FIG. 13, the magnet body 210 of the magnet portion 200 may be disposed slightly downward along the axial direction.
[0089]
In addition, the specific structure and procedure for carrying out the present invention can be appropriately changed to other structures and the like within a range in which the object of the present invention can be achieved.
[0090]
[Effects of Embodiment]
As described above, the peripheral portion of the diaphragm 400 integrally provided with the voice coil 500 is positioned and held, the magnetic body 300 is made continuous with one magnetic pole surface of the magnet unit 200, and the edge portion 430 of the diaphragm 400 is covered. Thus, the magnetic body 300 is opposed to the inner peripheral side of the voice coil 500, and the magnetic coil G is formed in the radial direction of the magnet portion 200 so that the voice coil 500 is movable in the axial direction to form a magnetic circuit. For this reason, the magnetic body 300 enters a dome shape from the outer peripheral side of the diaphragm 400 to the inner peripheral side of the voice coil 500 through the surface of the edge portion 430, and the magnet unit 200 is positioned on the outer peripheral side of the voice coil 500. Since the amplitude of the vibration plate 400 is relatively narrow particularly in the case where it is used for a portable electric device, even if the distance between the edge portion 430 and the magnetic body 300 is reduced, the vibration portion 410 is sufficiently formed. Sound generation by vibration can be obtained, the dimension in the thickness direction can be reduced, and the thickness can be easily reduced. In addition, since the magnetic body 300 is positioned in a dome shape on the surface side where the sound is generated, for example, acoustic characteristics such as horn effect and tube resonance can be easily adjusted by the magnetic body 300 without using other members. Can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a speaker device according to a first embodiment of the present invention.
FIG. 2 is a side view showing the speaker device according to the first embodiment.
FIG. 3 is a cross-sectional view showing the speaker device according to the first embodiment.
FIG. 4 is an explanatory diagram showing an assembly operation of the speaker device according to the first embodiment.
(A): explanatory diagram showing a magnet positioning step
(B): explanatory view showing the positioning step of the diaphragm
(C): explanatory diagram showing the assembly process of the magnetic body
(D): explanatory diagram showing the completed state of the speaker device
FIG. 5 is a cross-sectional view showing a speaker device according to a second embodiment of the present invention.
FIG. 6 is a plan view showing a speaker device according to a third embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a speaker device according to a third embodiment of the present invention.
FIG. 8 is a plan view showing a speaker device according to a fourth embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a speaker device according to a fourth embodiment of the present invention.
FIG. 10 is another cross-sectional view showing a speaker device according to a fourth embodiment of the present invention.
FIG. 11 is a cross-sectional view showing a speaker device according to still another embodiment of the present invention.
FIG. 12 is a cross-sectional view showing a speaker device according to still another embodiment of the present invention.
FIG. 13 is a cross-sectional view showing a speaker device according to still another embodiment of the present invention.
[Explanation of symbols]
100, 700, 100A, 100B Speaker device
200, 800, 200A, 200B Magnet part
210, 810, 210A, 210B Magnet body
220, 220A, 220B Inner yoke
230, 230A Outer yoke
233 Positioning fitting part as positioning part
300, 900, 300A, 300B Magnetic material
310, 310A, 310B outer cylinder
320, 320A, 330B Cross-linking part
321 through hole
330, 330A, 330B Inner tube
400, 400A, 400B Diaphragm
410,410A, 410B Vibrating part
420, 420A, 420B
430, 430A, 430B Edge part
440, 440A, 440B Holding part
500, 500A, 500B voice coil
600 Assembly jig
610 Placement section
620 Gap positioning part
621 Notch
820 connecting yoke
830 Magnetic pole forming yoke
950, 950A, 950B Cover part
953 Horn
G Magnetic gap

Claims

A magnet body;
  A yoke magnetically coupled to an outer peripheral surface on which one of the magnetic poles of the magnet body is formed;
  A diaphragm having a vibrating portion, an edge portion, and a raised portion disposed between the vibrating portion and the edge portion;
  A magnetic body magnetically coupled to the yoke and disposed to face the magnet body;
  A voice coil wound around the upright portion of the diaphragm;
  Comprising
  The magnetic body is provided with an inner cylindrical portion disposed inside the magnet body, an outer cylindrical portion disposed outside the magnet, and the edge provided between the inner cylindrical portion and the outer cylindrical portion. Comprising a bridging part arranged over the part
  The inner cylinder portion is formed along the upright portion continuously to the bridging portion,
  A magnetic gap is formed between the inner cylinder part and the magnet body,
  The diaphragm is provided in a state in which the rising portion is disposed in the magnetic gap and the vibration portion is disposed inside the inner cylinder portion.
  A speaker device characterized by that.

The speaker device according to claim 1,
The speaker device characterized in that the magnet body is formed in a ring shape.

The speaker device according to claim 1,
The speaker body, wherein the magnet body is formed in a rod shape.

The speaker device according to claim 3,
The said voice coil has a linear part, The magnet main body is arrange | positioned in the position corresponding to this linear part. The speaker apparatus characterized by the above-mentioned.

The speaker device according to claim 3 or 4, wherein
At least two of the magnet bodies are arranged at positions facing each other.

The speaker device according to any one of claims 3 to 5,
The speaker device, wherein the voice coil is formed in a substantially polygonal shape, and the magnet main body is disposed at a position corresponding to each side of the substantially polygonal shape.

The speaker device according to any one of claims 1 to 6 ,
The speaker device according to claim 1, wherein the diaphragm is provided with a series of gripping portions that protrude outward in an outer peripheral edge of the edge portion and are positioned and held on the magnetic body.

The speaker device according to any one of claims 1 to 7 ,
The yoke includes an outer yoke that is positioned and held by sandwiching and fixing the peripheral edge of the diaphragm between the magnetic body and the inner surface of the magnet body that is fitted to the inner surface of the magnet body via the voice coil. And an inner yoke that forms a magnetic gap substantially opposite to the magnetic body.

The speaker device according to any one of claims 1 to 7 ,
The magnet body has different magnetic poles on both end faces in the axial direction,
The yoke is provided on one end surface in the axial direction of the magnet main body, and is provided on the other end surface of the magnet main body, which is positioned and held by sandwiching and fixing the periphery of the diaphragm with the magnetic body. And a magnetic pole forming yoke that forms a magnetic gap substantially opposite to the magnetic body via the voice coil at an inner edge.

The speaker device according to claim 9 ,
The speaker device according to claim 1, wherein an inner peripheral edge of the connecting yoke is continuous with an inner peripheral edge of the magnet body.

The speaker device according to claim 9 or 10 , wherein
The speaker device according to claim 1, wherein an inner surface of the connecting yoke is inclined with respect to a direction toward the magnetic forming yoke.

The speaker device according to any one of claims 9 to 11 ,
The speaker device, wherein the magnetic pole forming yoke has an obtuse edge formed adjacent to the connecting yoke.

The speaker device according to any one of claims 1 to 12 ,
Speaker device at least one, which is characterized in that the center position of the magnetic body and the magnet main body having a positioning portion for fit position-decided on the same core of the magnetic body and the magnet main body.

The speaker device according to any one of claims 1 to 13 ,
The speaker is characterized in that the magnetic body is provided with a through hole at a position facing the edge of the diaphragm.

The speaker device according to any one of claims 1 to 14 ,
A speaker device comprising a cover portion attached to the magnetic body and covering a vibration portion of the diaphragm.

The speaker device according to claim 15 ,
The cover unit includes a cylindrical horn unit having an axial direction in a predetermined direction.

The speaker device according to any one of claims 1 to 16,
The magnet body is disposed between the diaphragm and the yoke.
A speaker device characterized by that.

The speaker device according to any one of claims 1 to 17,
The bridging portion is disposed in the sound radiation direction of the diaphragm.
A speaker device characterized by that.

The speaker device according to any one of claims 1 to 18,
The yoke extends from the lower end side of the outer peripheral surface of the magnet body toward the outer cylinder portion, and is provided in a state of surrounding the outer periphery of the magnet body.
A speaker device characterized by that.

The speaker device according to any one of claims 1 to 19,
The upright part and the inner cylinder part are arranged substantially in parallel.
A speaker device characterized by that.

The speaker device according to any one of claims 1 to 20,
The edge portion is formed in an arch shape in cross section.
A speaker device characterized by that.