JP4607417B2

JP4607417B2 - Double-sided contact connector

Info

Publication number: JP4607417B2
Application number: JP2002073920A
Authority: JP
Inventors: 智也大槻; 靖恵山崎; 徹志久保
Original assignee: Fujikura Ltd
Current assignee: Fujikura Ltd
Priority date: 2001-11-15
Filing date: 2002-03-18
Publication date: 2011-01-05
Anticipated expiration: 2022-03-18
Also published as: JP2003217707A

Description

【０００１】
【発明の属する技術分野】
この発明は、回路基板と表面実装型の電子部品との間に嵌挿させて使用するシリコンゴム等の弾性エラストマー層の両面接点コネクタに関する。
【０００２】
【従来の技術】
従来、回路基板と表面実装型の電子部品との間に、シリコンゴム等の弾性エラストマー層を介在させ、この弾性エラストマー層の厚さ方向に複数の導電細線を埋設するとともに、この弾性エラストマー層の両面に夫々の導電線と接合する接点を設けて、回路基板と電子部品との間を導通させるようにしたコンタクトが用いられる。この種のコンタクトでは、回路基板と電子部品との間の導通を確実なものとするために、電子部品を回路基板に向けて押圧させる。そのため、この弾性エラストマー層の厚さ方向に埋設された導電細線は、例えば特願２００１−２７０５２１号に示すように、弾性エラストマー層内に埋設される複数の導電細線が、この弾性エラストマー層の表面及び裏面に略垂直方向に伸びて直線状となり、且つ複数の導電細線の両端部は前記弾性エラストマー層の表面及び裏面から夫々突出させるようにして、弾性エラストマー層の両面接点コネクタを形成している。
【０００３】
【発明が解決しようとする課題】
ＩＣチップとテスト基板、又は基板同士を接続する両面接点コネクタにおいて、このような導電細線からなる導体は、高速信号を伝達するために、その間を接続する導線の自己インダクタンスを軽減するために、短く且つ径をなるべく大きくする、換言すれば太くすること、また導電率の良い材料を用いることが必要となる。
【０００４】
また、ＩＣチップとテスト基板、又は基板同士を接続する両面接点コネクタにおいて、弾性エラストマー層の厚さと導電細線の太径部分の長さを、寸分違わずに合致させるように弾性エラストマー層内に埋設することは難しく、そのため弾性エラストマー層の表裏面付近の一方側では導電細線の肩部が弾性エラストマー層内に埋没してしまい、他方側では導電細線の肩部が弾性エラストマー層表面から突出する不均衡が生ずる。そして弾性エラストマー層の表裏で弾性エラストマー層の押し退け量が相違するので、弾性エラストマー層に反りが発生する。
【０００５】
弾性エラストマー層にこのような反りが発生すると、両面接点コンタクトの相手物と接続する電気接点と貫通したスルーホールとこの電気接点を導通させる導体とからなるフレキシブルプリント基板（ＦＰＣ）を、表面及び裏面に夫々突出した複数の導電細線の両端部と前記スルーホールとを合致させると共に、導電細線の両端部が前記スルーホールに入るように接合する際に、どちらか一方の導電細線の肩部とＦＰＣのスルーホールの裏面との間に空隙ができ、その部分に弾性エラストマー層の孔の端部が盛り上がって入りこむために、導電細線とＦＰＣのスルーホールとの半田付けのための接触面積が小さくなってしまい、接合強度が低下する。この結合強度が低下すると、相手物との繰り返しの接続時に半田が剥離することがあり、コネクタの接続不良の原因となってしまう。
【０００６】
【課題を解決するための手段】
しかしながら、この導体を両端部の接点に接触する接触子に繋げるためにはＦＰＣ等のランド内のスルーホールに挿入しなければならず、そのため導体の両端部の夫々電気接点に接続される部分は径が小さい方が接続に都合が良い。そこで、この発明は、弾性エラストマー層内に埋設される複数の導電細線が、前記弾性エラストマー層の表面及び裏面に略垂直方向に伸びて直線状となり、且つ複数の導電細線の両端部は前記弾性エラストマー層の表面及び裏面から夫々突出させ、前記弾性エラストマー層内に埋設された円柱状部分の径を大径とし、且つ前記弾性エラストマー層から突出した両端部の径を小径とするようにして、前記弾性エラストマー層内に埋設された円柱状部分の径と前記弾性エラストマー層から突出した両端部の径とを異なる寸法に形成して、従来の電気接点への接続を維持しつつ、導線の自己インダクタンスを軽減するとともに、前記弾性エラストマー層の両面接点コネクタの表面及び裏面に、相手物と接続する電気接点であって、前記導電細線の両端部を貫通させるスルーホールと腕部とを有し、該腕部の前記スルーホールの反対側に半球状突部を設けた電気接点を備えたフレキシブルプリント基板を配置し、前記弾性エラストマー層の表面及び裏面から夫々突出した複数の導電細線の両端部を前記スルーホールに挿入して接合したことを特徴とする。
【０００７】
前記弾性エラストマー層の両面接点コネクタの、弾性エラストマー層の表面及び裏面から突出した前記両端部と、弾性エラストマー層内に埋設された部分とは同一材料で形成しても良いし、要求される自己インダクタンス軽減のために、埋設される部分は前記両端部と異なり、さらに導電性の良い材料で形成することもできる。
【０００８】
また、導電細線は中心部と該中心部を囲むようにした外周部とから構成され、前記中心部と前記外周部とが異なる材料で形成することができる。さらに、導電細線を中心部と該中心部を囲むようにした外周部とから構成し、弾性エラストマー層の表面及び裏面から突出した導電細線の両端部の外周が、互いに異なる２種類の材料で形成されるようにすることもできる。
【０００９】
上述したコネクタは、弾性エラストマー層の両面接点コネクタの表面及び裏面に相手物と接続する電気接点と貫通したスルーホールとこのスルーホールと、この電気接点を導通させる導体とからなるフレキシブルプリント基板を、表面及び裏面に夫々突出した複数の導電細線の両端部と前記スルーホールとが合致させると共に導電細線の両端部が前記スルーホールに入るように接合する。
【００１０】
また、この発明は、複数の導電細線の両端部が前記弾性エラストマー層の表面及び裏面から夫々突出させ、弾性エラストマー層内に埋設された円柱状部分の径と弾性エラストマー層から突出した両端部の径とを異なる寸法に形成したコネクタにおいて、前記導電細線の両端部が前記弾性エラストマー層の表面及び裏面から突出する表裏部分であって、前記導電細線の円柱状部分を埋設した前記弾性エラストマー層の孔の周縁部分に、窪み部を設けたことを特徴とする。この窪み部は、実施例として孔と同心の椀状又は略円錐形状の表面をもつもの、または階段状環溝或いはアリ溝状のものがあるが、前述したように、弾性エラストマー層の孔の端部が盛り上がりを防止し、導電細線とＦＰＣのスルーホールとの半田付けのための接触面積を確保するものであればどのような形状でも良い。
【００１１】
さらにこの発明では、弾性エラストマー層内に埋設された導電細線の円柱状部分に段部を設けることにより、弾性エラストマー層がこの段部を保持して、層内における導電細線を安定的に保持する。すなはち、両面接点コネクタの、導電細線の弾性エラストマー層内に埋設された円柱状部分の中央部分に、内向きに設けた段部に、弾性エラストマー層の孔壁が膨出して、導電細線が孔から抜け出ることを防止する。この抜け止め防止により、導電細線が弾性エラストマー層内に安定的に保持され、前述した弾性エラストマー層の反りと、それによる接続不良が未然に防止される。
【００１２】
【発明の実施の態様】
この発明の一実施例を図１乃至図５に示す。図１はこの発明による弾性エラストマー層の両面接点コネクタの断面を示す。図１のように、弾性エラストマー層の両面接点コネクタ１は、導電細線２と弾性エラストマー層３とから構成される。導電細線２を弾性エラストマー層３に挿入貫通させ、弾性エラストマー層３の導電細線２を所定の長さだけ突出させて、接続部とする。
【００１３】
本発明の弾性エラストマー層の両面接点コネクタの特徴は、弾性エラストマー層内に埋設される複数の導電細線２が、この弾性エラストマー層の表面及び裏面に略垂直方向に伸びて直線状となり、且つ複数の導電細線の両端部は前記弾性エラストマー層の表面及び裏面から夫々突出させ、弾性エラストマー層内に埋設された円柱状部分の径と弾性エラストマー層から突出した両端部の径とを異なる寸法に形成したことである。
【００１４】
両面接点コネクタ１の導電細線２は、埋設された円柱状部分４の径に比べて、弾性エラストマー層３から突出した両端部５の径が小さくなっている。一実施例として、円柱状部分４の径が５００μｍであるのに対し、両端部５の径は３３０μｍである。
【００１５】
導電細線２は、図１及び２に示すように、円柱状部分４の径と同じ径の導電特性の良い金属、例えば黄銅製棒状体を所定寸法に切断し、両端部５を更に小径になるように加工したものからなる。このように加工した導電細線２を弾性エラストマー層３の導電細線が貫通する位置に配置する。導電細線２の両端部５は弾性エラストマー層３の両面上に突出する。弾性エラストマー層３の表面及び裏面はフレキシブルプリント基板６によって被覆される。このフレキシブルプリント基板６の各所に所定間隔を置いて、導電細線２の突出する部分を挿通し電気接続するスルーホール７と腕部８とを備える電気接点９が、夫々の導電細線２の両端部５に接続されるように配置される。電気接点９はスルーホール７の反対側に半球状突部１０を具える。半球状突部１０は夫々回路基板１２及び電子部品１３の各接点との導通が確実になるように、互いに押圧接合される。この場合、図１に示すように、電気接点９の接合部を通る垂線、すなわち回路基板と電子部品の各接点と押圧接触する押圧中心線１４は、導電細線２の中心軸線１５から、電気接点９の腕部の長さだけ横方向に偏心しているので、電気接点にかかる押圧力により腕部が内側に向かって湾曲するだけで、押圧力が直接導電細線２に加わって細線を屈曲させることはない。
【００１６】
次に、図２乃至図６に導電細線の円柱部分と両端部を、異なる材料によって形成したものの数例を示す。図３乃至図６に示すように、中芯となる部分には、半田付性や剛性が要求されるので硬質の導電細線例えば黄銅、ベリリウム銅、リン青銅等の細線で形成し、弾性エラストマー層３に埋設される部分を、中芯を囲むように、径をなるべく太くするとともに、導電率の良い材料例えば純銅、純銀、純金、黄銅等を用いる。その対比は、用途に従って導電特性と剛性の要求性能に従い、図３乃至図６に示すように変化させることができる。特に前記導電細線の形状としては、図４に示すように両端部に亘って極細線を配置し、その周辺及び中心部の大径部分を、導電率の良い材料で中実に構成することができる。さらに図５に示すものは太い径の中芯部分の一方の端部は導電率の良い材料で覆い、他の端部は細線となるように加工したものである。また図６に示すものは、細い端部の1つを導電率の良い材料で覆ったものである。図１乃至図６に示す導電細線は、従来の単線よりなる導電細線に比べて、自己インダクタンスは顕著に軽減される。
【００１７】
一実施例として、円柱状部分の導体長が８００μm、導体径が２００μｍ、両端部の長さが夫々１００μｍ、両端突出部の径が夫々１２０μｍの導電細線を黄銅で一体成形した場合、自己インダクタンスは０．３９ｎＨ、抵抗は９．０ｍΩとなった。これは従来のストレートピンで成形した長さ１０００μｍ、導体径１２０μｍの黄銅製導電細線が、自己インダクタンスが０．４９ｎＨ、抵抗が１２．８ｍΩであるのに対し、自己インダクタンスは約８０％、抵抗は約７０％に減少している。
【００１８】
また、図３に示すように円柱状部分と両端部とを互いに異なる２種類の材料で形成する場合であって、円柱状部分の導体径を５００μｍで純銅で形成し、中心部並びに両端部の径を夫々３３０μｍで黄銅で形成した場合、導電細線の自己インダクタンスは０．２０ｎＨ、抵抗は１．８ｍΩになる。さらに円柱状部分の導体径５００μｍを黄銅で形成し、中心部並びに両端部の径を夫々３３０μｍでリン青銅で形成した場合、導電細線の自己インダクタンスは０．２０ｎＨ、抵抗は３．１ｍΩになる。このように、大径の円柱状部分に導電性の良い材料を配置し、両端部に剛性のある材料を配置するが、高周波電流は導体表面を流れることを考慮すれば、理想的には図４に示すように、外側に導電性の良い材料、内側に剛性のある材料を配置することが望ましい。
【００１９】
導電細線２はその円柱状部分４が弾性エラストマー層３内に挿入される際、例えば図７に示すように円柱状部分４が層３の下方に突出し、これが通過した後の孔の内側に向けて弾性エラストマー層３の上端部分が膨出し、膨出部１６が出来る。この膨出部１６は次の工程で導電細線２の上端部分が電気接点９のスルーホール７への挿入が不完全になり、従ってこの部分の半田付け作業が完全に行えない等の支障が出てくる。これを防止するためのこの発明の他の実施例を、図８乃至図１０に示す。
【００２０】
図８はこの発明による弾性エラストマー層に挿入される導電細線の円柱状部分に対応する孔の窪み部断面を示している。この発明では、導電細線２の両端部が前記弾性エラストマー層の表面及び裏面から突出する表裏部分であって、前記導電細線の円柱状部分４を埋設した前記弾性エラストマー層３の孔の開口周縁部分に窪み部１７が設けられるので、弾性エラストマー層３の端部の膨出部１６の形成は未然に防止され。導電細線２の両端部５に電気接点９のスルーホール７を挿通しようとするときに、両端部５とスルーホール７との間に空隙が出来るようなことがなく、その後の半田付け作業に支障をきたすことはない。
【００２１】
前記窪み部１７は図示のように、孔を囲む略椀形、又は円錐形状のものが用いられる。また他の実施例として、図９に示すように階段状環溝１８、図１０に示すようにアリ溝１９等種々の形状のものが用いられるが、弾性エラストマー層の孔の端部の盛り上がりを防止し、導電細線とＦＰＣの電気接点のスルーホールとの半田付けのための接触面積を確保するものであれば、どのような形状でも良い。
【００２２】
導電細線を弾性エラストマー層内に挿入した後も、導電細線は弾性エラストマー層内を軸方向に移動して、フレキシブルプリント基板６の反りを生ずることがある。これを未然に防止し、導電細線２が弾性エラストマー層３内に安定的に保持されるために、この発明の他の実施例として、弾性エラストマー層３内に埋設される導電細線２の円柱状部分４に段部２０を設けた、この発明の両面接点用コンタクトを図１１乃至１３に示す。図１１に示す導電細線２の段部２０は、導電細線２の弾性エラストマー層３内に埋設された円柱状部分４の中央部分に内向きに設けられ、導電細線を弾性エラストマー層の孔内に挿入した時に、孔壁が膨出して、その膨出部２１により導電細線が孔内に安定的に保持され、そこから抜け出ることを防止する。図１２に示す導電細線の段部２０は断面が彎曲した窪み状溝が複数本形成されたものであり、更に図１３に示す実施例では、導電細線２の円柱状部分４の外面に多数本の条溝が刻設され、弾性エラストマー層の孔の内壁面が段部になって円柱状部分４に密接して、導電細線２の軸方向の移動を未然に防止し、導電細線２が弾性エラストマー層３内に安定的に保持されるようにしている。
【００２３】
なお、この発明と比較するために、従来の単純な導電細線よりなる両面接点コネクタの断面を図１４に示す。符号１２、１３は回路基板または電子部品、１４はコネクタの回路基板または電子部品への押圧中心線、１５は導電細線の中心線である
【００２４】
【発明の効果】
この発明の電気コネクタは次のような顕著な効果を有する。
・導電細線を弾性エラストマー層に挿入・貫通させるだけで、容易に両面接点コネクタが形成される。
・この発明の両面接点コネクタは、従来の単線よりなる導電細線に比べて、自己インダクタンスは顕著に軽減される。
・容易に弾性エラストマー層の表裏面両側に導電細線を所定長さだけ突出することができるので、容易に高速伝送に適したＦＰＣ基板を接合することができる。
・この発明の電気コネクタは接点間の導通距離を短く設定しているので、高速信号を測定検査する際のソケットコネクタとして、挿入損失を顕著に軽減することができる。
・この発明の導電細線と、ＦＰＣのスルーホールとの半田付けのための接触面積は常に一定に保たれ、半田付け強度が不足することがない。
・導電細線が弾性エラストマー層内に安定的に保持され、前述した弾性エラストマー層の反りと、それによる接続不良が未然に防止される。
【図面の簡単な説明】
【図１】この発明による弾性エラストマー層の両面接点コネクタの断面を示す。
【図２】導電細線を弾性エラストマー層の表面及び裏面から突出した前記両端部と、弾性エラストマー層内に埋設された部分とは同一材料で形成したものを示す。
【図３】両端部と、弾性エラストマー層内に埋設された部分とは異なる材料で形成したものを示す。
【図４】両端部と、弾性エラストマー層内に埋設された部分とは異なる材料で形成した他の実施例を示す。
【図５】両端部と、弾性エラストマー層内に埋設された部分とは異なる材料で形成した、更に他の実施例を示す。
【図６】一端部と、弾性エラストマー層内に埋設された部分とは異なる材料で形成した、更に他の実施例を示す。
【図７】導電細線の円柱状部分が弾性エラストマー層の下方に突出し、これが通過した後の孔の内側に向けて弾性エラストマー層の上端部分が膨出した状態を示す断面図である。
【図８】この発明による導電細線を挿入する弾性エラストマー層の孔の開口周辺に窪み部を設けた両面接点コネクタの断面を示す。
【図９】窪み部の変形として階段状環溝の断面を示す。
【図１０】窪み部の変形としてアリ状溝の断面を示す。
【図１１】導電細線の円柱状部分に段部を設けたものを示す。
【図１２】導電細線の円柱状部分に段部を設けたものの、他の実施例を示す。
【図１３】導電細線の円柱状部分に段部を設けたものの、更に他の実施例を示す。
【図１４】従来の弾性エラストマー層の両面接点コネクタの断面を示す。
【符号の説明】
１両面接点コネクタ
２導電細線
３弾性エラストマー層
４円柱状部分
５両端部
６フレキシブルプリント基板
７スルーホール
８腕部
９電気接点
１０半球状突部
１２回路基板
１３電子部品
１４押圧中心線
１５中心軸線
１６膨出部
１７窪み部
１８階段状環溝
１９アリ溝
２０段部
２１膨出部[0001]
BACKGROUND OF THE INVENTION
This invention relates to both surface contacts connector resilient elastomeric layer of silicone rubber or the like to be used fitted so inserted between the circuit board and the surface mount electronic component.
[0002]
[Prior art]
Conventionally, between the circuit board and the surface mount electronic component, it is interposed resilient elastomeric layer of silicone rubber or the like, as well as embedded a plurality of fine conductors in the thickness direction of the elastic elastomer layer, the resilient elastomeric layer A contact is used in which contact points are formed on both sides for bonding to the respective conductive lines so as to conduct between the circuit board and the electronic component. In this type of contact, the electronic component is pressed toward the circuit board in order to ensure conduction between the circuit board and the electronic component. Table therefor, embedded in the thickness direction fine conductors of the resilient elastomeric layer, for example, as shown in Japanese Patent Application No. 2001-270521, a plurality of fine conductors that are embedded in the resilient elastomeric layer, the resilient elastomeric layer It becomes linearly extend in a direction substantially perpendicular to the surface and the back surface, and both end portions of a plurality of conductive thin line so as to respectively protrude from the front surface and the back surface of the resilient elastomeric layer, forming both surface contacts connector resilient elastomeric layer is doing.
[0003]
[Problems to be solved by the invention]
In both face contacts connector for connecting the IC chip and the test board, or the boards, conductor made of such fine conductors, in order to transmit high-speed signals, in order to reduce the self-inductance of the conductor connecting therebetween, It is necessary to shorten the diameter and increase the diameter as much as possible, in other words, to increase the diameter, and to use a material having good conductivity.
[0004]
In addition, in a double-sided contact connector that connects an IC chip and a test board, or between boards, the thickness of the elastic elastomer layer and the length of the large diameter portion of the conductive thin wire are embedded in the elastic elastomer layer so as to match each other without any difference. not be difficult, therefore in one side near the front and back surfaces of the resilient elastomeric layer will in the shoulder of the conductive thin wires embedded in the resilient elastomeric layer, on the other side shoulder portion of the conductive thin wire projects from resilient elastomeric layer surface Equilibrium occurs. And since displacement of the resilient elastomeric layer on the front and back sides of the resilient elastomeric layer is different, warpage is generated in the resilient elastomeric layer.
[0005]
When such warpage resilient elastomeric layer occurs, a flexible printed circuit (FPC) comprising a through hole penetrating an electrical contact for connecting a mating of two-sided contact co Ntakuto conductor for conducting the electrical contact surface and When both ends of a plurality of thin conductive wires projecting on the back surface are matched with the through hole, and the both ends of the thin conductive wire are joined so as to enter the through hole, the shoulder of one of the thin conductive wires Since a gap is formed between the back surface of the through hole of the FPC and the end of the hole of the elastic elastomer layer rises and enters the portion, the contact area for soldering between the conductive thin wire and the through hole of the FPC is small. As a result, the bonding strength decreases. When this bonding strength is reduced, the solder may be peeled off during repeated connection with the counterpart, causing a connection failure of the connector.
[0006]
[Means for Solving the Problems]
However, in order to connect this conductor to a contact that contacts the contacts at both ends, the conductor must be inserted into a through hole in a land such as an FPC. Therefore, the portions connected to the electrical contacts at both ends of the conductor are A smaller diameter is convenient for connection. Accordingly, the present invention is a plurality of fine conductors that are embedded in the resilient elastomeric layer becomes a linearly extending in a direction substantially perpendicular to the front surface and the rear surface of the resilient elastomeric layer, and both end portions of a plurality of fine conductors are the is respectively projecting from the front surface and the rear surface of the elastic elastomer layer, the elastic diameter buried cylindrical portion the elastomeric layer was a large diameter, and the diameter of both end portions protruding from the resilient elastomeric layer such that a small diameter Te, formed in diameter and different dimensions of the diameter and both end portions projecting from the resilient elastomeric layer of buried cylindrical portion resilient elastomeric layer, while maintaining a connection to a conventional electrical contacts, conductors thereby reducing the self-inductance of, the front surface and the rear surface of both the face contacts connector of the resilient elastomeric layer, an electrical contact for connecting a mating object, both of the conductive thin wire And a through-hole and the arm portion through which the parts, placing the flexible printed circuit board with electrical contacts having a hemispherical protrusion on the opposite side of the through hole of the arm portion, the surface of the resilient elastomeric layer In addition, both end portions of a plurality of conductive thin wires protruding from the back surface are inserted into and joined to the through holes.
[0007]
Wherein both face contacts connectors resilient, elastomeric layer, and the said end portion projecting from the front surface and the rear surface of the resilient elastomeric layer may be formed of the same material as the buried portions in the elastic elastomer layer, it is required In order to reduce the self-inductance, the embedded portion is different from the both end portions, and can be formed of a material having higher conductivity.
[0008]
The thin conductive wire is composed of a central portion and an outer peripheral portion surrounding the central portion, and the central portion and the outer peripheral portion can be formed of different materials. Further, the fine conductors consist of a to the outer peripheral portion surrounding the central portion and said central portion, the outer periphery of both end portions of the front surface and a conductive thin wire protruding from the rear surface of the elastic elastomer layer, two different kinds of material to each other It can also be formed.
[0009]
Connector described above, the flexible printed circuit board comprising a through hole penetrating an electrical contact to be connected to the mating object on the front surface and the rear surface of both the face contacts connectors resilient, elastomeric layer and the through hole, a conductor for conducting the electrical contacts Are joined so that both end portions of the plurality of thin conductive wires projecting from the front surface and the back surface respectively coincide with the through hole and both end portions of the thin conductive wire enter the through hole.
[0010]
Further, the present invention is both end portions at both ends of the plurality of conductive thin wires protruding from the resilient elastomeric layer front surface and allowed to respectively protrude from the back surface of the diameter and the resilient elastomeric layer of buried cylindrical portion resilient elastomeric layer In the connector formed with a diameter different from that of the elastic elastomer layer, both ends of the conductive thin wire are front and back portions protruding from the front and back surfaces of the elastic elastomer layer, and the cylindrical portion of the conductive thin wire is embedded. A recess is provided in the peripheral portion of the hole. The recess is, those with a hole concentric with bowl-shaped or the surface of the substantially conical as an example, or there is stepped ring groove or dovetail groove-like, as described above, the holes in the resilient elastomeric layer Any shape may be used as long as the end portion prevents the bulge and secures a contact area for soldering between the conductive thin wire and the through hole of the FPC.
[0011]
Further in the present invention, by providing a stepped portion in the cylindrical portion of the buried conductive thin wires resilient elastomeric layer, resilient elastomeric layer holds the step portion, for holding the fine conductors in the layer stably . Sunawachi, both surface contacts connector, the central portion of the buried cylindrical portion resilient elastomeric layer of fine conductors, the stepped portion provided inwardly the hole wall of resilient elastomeric layer bulges, conductive Prevents fine wires from coming out of the holes. The stopper prevents, fine conductors is held stably in the resilient elastomeric layer, and warpage of the resilient elastomeric layer described above, it by the connection failure is prevented.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the present invention is shown in FIGS. Figure 1 shows a cross-section of both the face contacts connector resilient elastomeric layer according to the present invention. As shown in FIG. 1, the two surface contacts the connector 1 of the resilient elastomeric layer is comprised of a conductive thin wire 2 and the resilient elastomeric layer 3. The fine conductors 2 is inserted through the resilient elastomeric layer 3, is protruded a fine conductors 2 of the resilient elastomeric layer 3 by a predetermined length, and connecting portions.
[0013]
Features of both face contacts connector resilient elastomeric layer of the present invention, a plurality of fine conductors 2 embedded in the resilient elastomeric layer, becomes linearly extend in a direction substantially perpendicular to the front surface and the rear surface of the elastic elastomer layer, and both end portions of a plurality of fine conductors are different and diameters of the front surface and the rear surface is respectively projecting from both end portions protruding from the diameter and the resilient elastomeric layer of buried cylindrical portion resilient elastomeric layer of the resilient elastomeric layer It was formed in the dimension.
[0014]
Fine conductors 2 of the two surface contact connector 1, as compared to the buried diameter of the cylindrical portion 4, the diameter of both end portions 5 projecting from the resilient elastomeric layer 3 is small. As an example, the diameter of the cylindrical portion 4 is 500 μm, whereas the diameter of both end portions 5 is 330 μm.
[0015]
Fine conductors 2, as shown in FIG. 1 and 2, metal having excellent conductive properties of the same diameter as the diameter of the cylindrical portion 4, for example, a brass rod-shaped body was cut into a predetermined size, further comprising a small-diameter both end portions 5 It consists of what was processed as follows. The fine conductive wire 2 processed in this way is disposed at a position where the fine conductive wire of the elastic elastomer layer 3 penetrates. Both end portions 5 of the conductive thin wire 2 protrude on both surfaces of the elastic elastomer layer 3. Surface and the back surface of the resilient elastomeric layer 3 is covered by a flexible printed circuit board 6. Electrical contacts 9 having through holes 7 and arm portions 8 that are electrically connected through the protruding portions of the conductive thin wires 2 at predetermined intervals on the flexible printed circuit board 6 are provided at both end portions of the respective conductive thin wires 2. 5 to be connected. Electrical contact 9 comprises a hemispherical projection 10 on the opposite side of the through hole 7. Hemispherical protrusions 10 is such that conduction between the contacts of the respective circuit board 12 and the electronic component 13 is ensured, it is pressed joined together. In this case, as shown in FIG. 1, the vertical line passing through the joint portion of the electrical contact 9 , that is, the pressing center line 14 that press-contacts each contact of the circuit board and the electronic component, is separated from the central axis 15 of the conductive thin wire 2. Since the arm portion 9 is eccentric in the lateral direction, the arm portion is bent inward by the pressing force applied to the electrical contact, and the pressing force is directly applied to the conductive thin wire 2 to bend the thin wire. There is no.
[0016]
Next, the cylindrical portion and both end portions of the conductive fine line in FIGS. 2 to 6 show several examples of those formed by different materials. As shown in FIG. 3 to FIG. 6, the core portion is required to have solderability and rigidity, so it is formed of a thin thin conductive wire such as brass, beryllium copper, phosphor bronze, etc., and an elastic elastomer layer The portion embedded in 3 is made as thick as possible so as to surround the core, and a material having good conductivity such as pure copper, pure silver, pure gold, brass or the like is used. The contrast can be changed as shown in FIGS. 3 to 6 according to the required performance of the conductive characteristics and rigidity according to the application. Particularly the shape of the conductive thin wire, may be over the both end portions as shown in FIG. 4 arranged hairline, the large diameter portion of the peripheral and central, constituting a solid material with good electrical conductivity . Further, the one shown in FIG. 5 is processed so that one end portion of the thick core portion is covered with a material having good conductivity and the other end portion becomes a thin line. In the case shown in FIG. 6, one of the narrow ends is covered with a material having good conductivity. The self-inductance of the thin conductive wires shown in FIGS. 1 to 6 is remarkably reduced as compared with the conventional thin conductive wires.
[0017]
As an example, the conductor length is 800μm cylindrical portion, if the conductor diameter is 200 [mu] m, both ends portions of each 100μm length, diameter of both end protrusions of fine conductors each 120μm integrally molded with brass, self inductance The resistance was 0.39 nH and the resistance was 9.0 mΩ. This is because a brass thin conductive wire with a length of 1000 μm and a conductor diameter of 120 μm formed with a conventional straight pin has a self-inductance of 0.49 nH and a resistance of 12.8 mΩ, whereas the self-inductance is about 80% and the resistance is It has decreased to about 70%.
[0018]
Further, in the case of forming a cylindrical shaped portion two different types of the end portions and the material, as shown in FIG. 3, the conductor diameter of the cylindrical portion is formed of pure copper at 500 [mu] m, the center portion and both end portions When the diameter is 330 μm and each is made of brass, the self-inductance of the conductive thin wire is 0.20 nH and the resistance is 1.8 mΩ. Further, when the conductor diameter of the cylindrical portion is formed of brass, and the diameter of the central portion and both end portions is 330 μm and is formed of phosphor bronze, the self-inductance of the conductive thin wire is 0.20 nH and the resistance is 3.1 mΩ. Thus, placing a material having good conductivity to a cylindrical portion of larger diameter, is arranged a material having rigidity at both ends, given that the high frequency current flowing in the conductor surface, ideally FIG As shown in FIG. 4, it is desirable to dispose a material with good conductivity on the outside and a rigid material on the inside.
[0019]
When the cylindrical portion 4 is inserted into the elastic elastomer layer 3, for example, as shown in FIG. 7, the conductive thin wire 2 protrudes below the layer 3, and is directed toward the inside of the hole after the passage. As a result, the upper end portion of the elastic elastomer layer 3 bulges to form a bulging portion 16. In the next process, the bulging portion 16 has a problem in that the upper end portion of the conductive thin wire 2 is not completely inserted into the through hole 7 of the electrical contact 9, so that the soldering operation of this portion cannot be performed completely. Come. Another embodiment of the present invention for preventing this is shown in FIGS.
[0020]
FIG. 8 shows a cross section of a hollow portion corresponding to a cylindrical portion of a thin conductive wire inserted into the elastic elastomer layer according to the present invention. In the present invention, both ends of the conductive thin wire 2 are front and back portions protruding from the front and back surfaces of the elastic elastomer layer, and the opening peripheral portion of the hole of the elastic elastomer layer 3 in which the cylindrical portion 4 of the conductive thin wire is embedded. Therefore, the formation of the bulging portion 16 at the end of the elastic elastomer layer 3 is prevented beforehand. When trying to insert the through hole 7 of the electrical contact 9 into the both end portions 5 of the conductive thin wire 2, there is no gap between the both end portions 5 and the through hole 7, which hinders the subsequent soldering operation. Never come.
[0021]
As shown in the figure, the hollow portion 17 has a substantially bowl shape or conical shape surrounding the hole. Further, as other embodiments, those having various shapes such as a stepped annular groove 18 as shown in FIG. 9 and a dovetail groove 19 as shown in FIG. 10 are used, but the end of the hole of the elastic elastomer layer is raised. Any shape can be used as long as it can prevent and secure a contact area for soldering between the conductive thin wire and the through hole of the electrical contact of the FPC.
[0022]
After inserting the fine conductors in resilient elastomeric layer is also conductive thin line by moving the resilient elastomeric layer in the axial direction, which may result in warping of the flexible printed circuit board 6. This was prevented, because the fine conductors 2 is stably held in the resilient elastomeric layer 3, another embodiment of the present invention, fine conductors 2 of the cylindrical embedded in the resilient elastomeric layer 3 The contact for double-sided contact according to the present invention in which the step portion 20 is provided in the portion 4 is shown in FIGS. The step portion 20 of the conductive thin wire 2 shown in FIG. 11 is provided inwardly at the center portion of the cylindrical portion 4 embedded in the elastic elastomer layer 3 of the conductive thin wire 2, and the conductive thin wire is placed in the hole of the elastic elastomer layer. When inserted, the hole wall bulges out, and the bulged portion 21 holds the conductive thin wire stably in the hole and prevents it from coming out. The step portion 20 of the conductive thin wire shown in FIG. 12 is formed with a plurality of hollow grooves having a curved cross section. Further, in the embodiment shown in FIG. 13, a large number of step portions 20 are formed on the outer surface of the cylindrical portion 4 of the conductive thin wire 2. Are formed, the inner wall surface of the hole of the elastic elastomer layer becomes a stepped portion and is in close contact with the cylindrical portion 4 to prevent the conductive thin wire 2 from moving in the axial direction, and the conductive thin wire 2 is elastic. The elastomer layer 3 is stably held.
[0023]
For comparison with the present invention, FIG. 14 shows a cross section of a conventional double-sided contact connector made of simple conductive fine wires. Reference numerals 12 and 13 are circuit boards or electronic components, 14 is a center line for pressing the connector to the circuit board or electronic components, and 15 is a center line of the conductive thin wires.
【The invention's effect】
The electrical connector of the present invention has the following remarkable effects.
In the-fine conductors simply by inserting and penetrating the resilient elastomeric layer, easily both face contacts connectors is formed.
- Both surface contacts the connector of the invention, as compared with the fine conductors made of conventional single line, the self-inductance is significantly reduced.
Since the conductive thin wires can be easily protruded by a predetermined length on both the front and back sides of the elastic elastomer layer , an FPC board suitable for high-speed transmission can be easily joined.
-Since the electrical connector of this invention has set the conduction | electrical_connection distance between contacts short, as a socket connector at the time of measuring and inspecting a high-speed signal, insertion loss can be reduced notably.
The contact area for soldering between the conductive thin wire of the present invention and the through hole of the FPC is always kept constant, and the soldering strength is not insufficient.
Electroconductive fine lines stably held in the resilient elastomeric layer, and warpage of the resilient elastomeric layer described above, it by the connection failure is prevented.
[Brief description of the drawings]
1 shows a cross-section of both the face contacts connector resilient elastomeric layer according to the present invention.
Shows one formed of the same material to Figure 2 fine conductors and said end portion projecting from the front surface and the rear surface of the elastic elastomer layer, the buried portions in the elastic elastomer layer.
FIG. 3 shows a structure in which both end portions and portions embedded in the elastic elastomer layer are made of different materials.
FIG. 4 shows another embodiment in which both ends and a portion embedded in the elastic elastomer layer are made of different materials.
FIG. 5 shows still another embodiment in which both end portions and portions embedded in the elastic elastomer layer are made of different materials.
FIG. 6 shows still another embodiment in which one end portion and a portion embedded in the elastic elastomer layer are made of different materials.
FIG. 7 is a cross-sectional view showing a state in which a cylindrical portion of a conductive thin wire protrudes downward from an elastic elastomer layer, and an upper end portion of the elastic elastomer layer bulges toward the inside of the hole after the passage.
8 shows a cross-section of both the face contacts connector a recess provided in the opening periphery of the hole of the resilient elastomeric layer of inserting a conductive thin wire according to the present invention.
FIG. 9 shows a cross-section of a stepped annular groove as a modification of the recess.
FIG. 10 shows a cross section of an ant-like groove as a deformation of a recess.
FIG. 11 shows a conductive thin wire provided with a step in a cylindrical portion.
FIG. 12 shows another embodiment in which a step portion is provided in a cylindrical portion of a conductive thin wire.
FIG. 13 shows still another embodiment in which a step portion is provided in a cylindrical portion of a conductive thin wire.
Figure 14 shows a cross-section of both the face contacts the connector of the conventional resilient elastomeric layer.
[Explanation of symbols]
1 Both face contacts the connector 2 fine conductors 3 resilient elastomeric layer 4 cylindrical portion 5 at both ends 6 the flexible printed circuit board 7 through hole 8 arm 9 electrical contact 10 hemispherical projections 12 circuit board 13 electronic component 14 presses the center line 15 center axis 16 bulging part 17 hollow part 18 step-like annular groove 19 dovetail groove 20 step part 21 bulging part

Claims

A plurality of fine conductors that are embedded in the resilient elastomeric layer is, the front side of the elastic front surface of the elastomeric layer and extending in a direction substantially perpendicular to the rear surface becomes a straight line, and both ends of the plurality of conductive thin line the resilient elastomeric layer and is respectively projected from the rear surface, the elastic diameter of buried cylindrical portion to the elastomeric layer to a large diameter, and the diameter of both end portions protruding as a small diameter from the resilient elastomeric layer, wherein the resilient elastomeric layer and forming the different dimensions and diameters of the both end portions protruding from the radial and the resilient elastomeric layer of buried cylindrical portion within, the front surface and the rear surface of both the face contacts connector of the resilient elastomeric layer, and a mating object an electrical contact for connecting, and a through-hole and the arm portion through which the both end portions of the conductive thin wire, set a hemispherical protrusion on the opposite side of the through hole of the arm portion A flexible printed circuit board disposed with electrical contacts were characterized by both ends of a plurality of fine conductors that respectively protrude from the surface and the back surface of the resilient elastomeric layer joined by inserting into the through hole, both interviews Point connector.

And both end portions of the conductive thin wire protruding from the front surface and the back surface of the resilient elastomeric layer, both interviews of claim 1 wherein said is a resilient elastomeric layer to buried portion, characterized in that it is formed of the same material Point connector.

And wherein the opposite ends of the front surface and a conductive thin wire protruding from the back surface of the resilient elastomeric layer is an integral structure of the same material, the embedded in resilient elastomeric layer portion formed of material different from said end portion both face contacts connector according to claim 1 wherein the.

The conductive thin wire is composed of an outer peripheral portion so as to surround a central portion and said central portion, both surface contacts according to claim 1, characterized in that said central portion and said peripheral portion are formed of different materials connector.

The conductive thin wire is composed of an outer peripheral portion so as to surround a central portion and said central portion, the outer periphery of both end portions of the front surface and a conductive thin wire protruding from the back surface of the resilient elastomeric layer is, mutually different two kinds of materials both face contacts connector according to claim 1, characterized in that formed.

2. The connector according to claim 1, wherein both ends of the thin conductive wire are portions protruding from the front and back surfaces of the elastic elastomer layer, and the peripheral portion of the hole of the elastic elastomer layer in which the cylindrical portion of the thin conductive wire is embedded. the recessed portion is provided to, both interview point connector.

The recess portion is substantially conical shape, two surface contacts connector according to claim 6.

The recess portion is a stepped ring groove, both interviews point connector according to claim 6.

The connector according to claim 1, wherein the conductive provided one or more recess in the buried cylindrical portion resilient elastomeric layer of the thin wire, the two face contacts connectors.