JP2004032877A - Method of connecting flat circuit bodies with each other, electric connection box and method of manufacturing the same - Google Patents

Method of connecting flat circuit bodies with each other, electric connection box and method of manufacturing the same Download PDF

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JP2004032877A
JP2004032877A JP2002184264A JP2002184264A JP2004032877A JP 2004032877 A JP2004032877 A JP 2004032877A JP 2002184264 A JP2002184264 A JP 2002184264A JP 2002184264 A JP2002184264 A JP 2002184264A JP 2004032877 A JP2004032877 A JP 2004032877A
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flat circuit
circuit bodies
bodies
exposed
insulating
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JP2002184264A
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JP3976627B2 (en
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Katsuhiro Kubota
久保田 勝弘
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Yazaki Corp
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Yazaki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide the interlayer connection between compact and reliable flat circuit bodies. <P>SOLUTION: The insulating layers of the flat circuit bodies 1-4 are removed by laser to expose the lead wires 6 and 6' of the flat circuit bodies, and the exposed lead wires of both flat circuit bodies are fused together in condition that several flat circuit bodies are stacked. A cut is made in the insulating layer by laser, and then the cut section is die-cut with a punch to expose the lead wires 6 and 6'. After exposure of the lead wires 6 and 6', at least one exposed lead wire is brought into contact or nearly touch with the other exposed lead wire. The mutual fusion of the exposed conductors is performed by low-resistance welding. A flat circuit assembly 37 is stored in a connection box body 36, and the terminal cable 31 of the flat circuit body assembly is pressure-welded to the press-welding part 41 of the terminal 42 on the side of the connection box body. The flat circuit body assembly 37 is set on an insulating plate 38. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、複数本の電線を並列に有するフラット回路体を層間接続させるためのフラット回路体相互の接続方法と、そのフラット回路体アセンブリを装着する電気接続箱の製造方法とその電気接続箱に関するものである。
【0002】
【従来の技術】
図13(a)(b)は従来のフラット回路体相互の接続構造と接続方法の一形態を示すものである(特開平8−17259号参照)。
このフラット回路体61,62は合成樹脂製の絶縁層63と、絶縁層63内に埋め込まれた複数のフラット導体64とで構成されている。各フラット導体64に対応して絶縁層63の片面側に穴部65が設けられ、両フラット回路体61,62の穴部65を対向させて、穴部65内でフラット導体64がハンダ66を介して相互に接続される。これにより、両フラット回路体61,62が相互に接続される。
【0003】
しかしながら、上記フラット回路体相互の接続構造と接続方法にあっては、絶縁層63の片面側のみに穴部65を設けたり、両フラット導体64をハンダ66を介して接続させる作業に多くの工数を要したり、作業の正確性を要するといった懸念があった。
【0004】
一方、図14は従来の電気接続箱の一形態を示すものである(実開平7−9023号参照)。
この電気接続箱71は、合成樹脂製の上カバー72と下カバー73すなわち接続箱本体と、両カバー72,73の間に積層して収容される電線配線板74やバスバー配線板75とを備えている。
【0005】
電線配線板74は合成樹脂製の絶縁基板76と、絶縁基板76の表面に布線される複数本の絶縁被覆電線77と、絶縁基板76を貫通し、電線77に圧接された端子78とを備えている。端子78は一方に圧接部78a、他方に雄タブ状の電気接触部78bを有している。
【0006】
また、バスバー配線板75は絶縁基板79と、絶縁基板79の表面に配索された複数本のバスバー80とを備えている。バスバー80は一体に立ち上げ又は立ち下げられた雄タブ状の端子81を有している。各端子78,81は上カバー72や下カバー73の各ハウジング82,83内に突出され、端子78,81とハウジング82,83とでコネクタが構成される。コネクタには外部ワイヤハーネスのコネクタ(図示せず)が接続される。コネクタに代えてハウジング82,83内に中継端子を介してヒューズやリレーを接続させることも可能である。
【0007】
しかしながら、上記従来の電気接続箱71にあっては、複数枚の硬質な絶縁基板76,79や多数本の電線77や重量のあるバスバー80等によって構造が肥大化・重量化すると共に、接続回路数が制限されたりするといった問題や、電線77の布線作業やバスバーの配索作業に多くの工数を要するという問題があった。
【0008】
この問題を解消するべく、前記図13のフラット回路体61,62を電気接続箱71内に配置する等した場合でも、フラット回路体相互の接続作業性や電気的接続の信頼性を一層向上させる必要があった。
【0009】
【発明が解決しようとする課題】
本発明は、上記した点に鑑み、コンパクトで且つ多くの接続回路に対応でき、しかも層間接続の信頼性を向上させることのできるフラット回路体相互の接続方法とそれを適用した電気接続箱の製造方法及び電気接続箱を提供することを目的とする。
【0010】
【課題を解決するための手段】
上記目的を達成するために、本発明の請求項1に係るフラット回路体相互の接続方法は、フラット回路体の絶縁層をレーザで除去して該フラット回路体の導線を露出させ、各フラット回路体を積層した状態で両フラット回路体の露出導線を相互に溶着させることを特徴とする。
上記構成により、フラット回路体の絶縁層がレーザの照射で容易に且つ確実に除去される。レーザは金属製の導線の表面に反射し、導線には何ら傷が付くことがなく、絶縁層のみが除去される。そして、露出した導線を相互に溶着することで、フラット回路体相互の層間接続が行われる。導線は所望(所要)の位置で露出され、且つ各層の所望(所要)の導線同士が直接接続される。
【0011】
請求項2に係るフラット回路体相互の接続方法は、請求項1記載のフラット回路体相互の接続方法において、前記絶縁層に前記レーザで切れ込みを入れた後、パンチで切れ込み部分を打ち抜いて前記導線を露出させることを特徴とする。
上記構成により、レーザの照射で絶縁層に正確な寸法で切れ込みが入れられ、切れ込み部分が絶縁層本体から分離される。次いでパンチで切れ込み部分を押圧することで、容易に絶縁層が導線から剥離される。
【0012】
請求項3に係るフラット回路体相互の接続方法は、請求項1又は2記載のフラット回路体相互の接続方法において、前記導線を露出させた後、フォーミング加工で少なくとも一方の露出導線を他方の露出導線に接触ないし略接触させることを特徴とする。
上記構成により、一方の露出導線が他方の露出導線に向けてフォーミング加工で押圧されつつ変形し、他方の露出導線に接触ないしほぼ接触する。これにより、両露出導線が正確に位置決めされ、次工程の両露出導線の直接接続が正確に行われる。
【0013】
請求項4に係るフラット回路体相互の接続方法は、請求項1〜3の何れか1項に記載のフラット回路体相互の接続方法において、前記露出導体相互の溶着を抵抗溶接で行わせることを特徴とする。
上記構成により、レーザであけられた絶縁層の孔部に電極を挿入して露出導線同士が容易に且つ確実に抵抗溶接される。
【0014】
請求項5に係る電気接続箱の製造方法は、請求項1〜4の何れか1項に記載のフラット回路体相互の接続方法で形成したフラット回路体アセンブリを接続箱本体内に収容し、該フラット回路体アセンブリの端末電線を接続箱本体側の端子の圧接部に圧接することを特徴とする。
上記構成により、複数枚の薄いフラット回路体を積層して薄いフラット回路体アセンブリが得られ、電気接続箱内に少ないスペースでフラット回路体アセンブリが収容される。そして、フラット回路体アセンブリの端末電線を端子の圧接部に接続することで、端子にヒューズ等の電気部品を接続したり、端子を収容したコネクタに外部ワイヤハーネスのコネクタをしたりして、フラット回路体と電気部品や外部ワイヤハーネス等との多くの回路接続を得ることができる。端子の圧接部と端末電線との接続に皮剥きは不要である。
【0015】
請求項6に係る電気接続箱の製造方法は、請求項5記載の電気接続箱の製造方法において、前記フラット回路体アセンブリを絶縁プレート上にセットすることを特徴とする。
上記構成により、フラット回路体アセンブリの端末電線を絶縁プレートに固定したり、それと同時に絶縁プレート上で端子の圧接部に端末電線を効率良く接続したりすることができる。また、絶縁プレートを介して複数層にフラット回路体アセンブリを配置することができる。各フラット回路体アセンブリは絶縁プレートで確実に絶縁される。
【0016】
請求項7に係る電気接続箱は、請求項5又は6記載の電気接続箱の製造方法で製造されたことを特徴とする
上記構成により、請求項5又は6と同様の作用効果が奏せられる。すなわち、電気続箱内で少ないスペースでフラット回路体アセンブリが収容される。また、端子を介してフラット回路体と電気部品や外部ワイヤハーネス等との多くの回路接続を得ることができる。また、フラット回路体の端末電線を絶縁プレートに固定したり、それと同時に絶縁プレート上で端子の圧接部に端末電線を効率良く接続したりすることができ、絶縁プレートを介して複数層にフラット回路体アセンブリを配置することもできる。
【0017】
【発明の実施の形態】
図1は、本発明に係るフラット回路体相互の接続構造の一実施形態を示すものである。
【0018】
フラット回路体1〜4は上下に積層して配置されている。本形態で上側のフラット回路体1,2は二枚、下側のフラット回路体3,4は二枚である。各フラット回路体1〜4の枚数や長さは本形態に限らず適宜設定される。各フラット回路体1〜4は合成樹脂製の薄肉の絶縁シート(絶縁層ないし絶縁体)5,5′と、絶縁シート5,5′内に並列に埋入された複数本の断面丸形の真直な導線(芯線ないし導体)6,6′とで構成されている。上層の絶縁シートと導線を符号5,6,下層の絶縁シートと導線を符号5′,6′で示している。
【0019】
絶縁シート5,5′としては塩ビ、ポリエチレン、ポリエステル、ポリウレタン、又はフィルム状のPETやPEN等が使用されている。導線6,6′は一本の銅線で構成されている。導線6,6′は各絶縁シート5,5′間に挟み込まれたり、あるいは各絶縁シート5,5′内にインサート成型されたりしている。
【0020】
上下の各フラット回路体1〜4は板厚方向に重ねられて接触し、上下の各導線6,6′は直交して位置している。各導線6,6′は端部を含む全長に渡って絶縁シート5,5′で覆われている。上下のフラット回路体1〜4には所要な導線6,6′の長手方向の所要位置において絶縁シート5,5′に複数の矩形状の孔部7が貫通して設けられている。
【0021】
図2(a)(b)に一部のフラット回路体3を代表で示す如く、孔部7の中央にフラット回路体3の導線6′が露出して位置している。孔部7は導線周囲の環状の絶縁シート部分5aから導線6′の両側の薄肉のシート本体(連結部)5bにかけて矩形状に形成される。
【0022】
孔部7はレーザとパンチとダイスとで簡単且つ正確にあけることができる。上下両層のフラット回路体1〜4の孔部7を対向させた状態で、上下層の導線6,6′が孔部7内で溶接により直接接続される。以下にその方法についてフラット回路体3を用いて説明する。
【0023】
先ず図3(a)の如く絶縁シート5′にレーザで矩形状に切り込みを付ける。切り込み(切れ込み部分)8は符号8aの如く導線6′を径方向に横断し、符号8bの如くシート本体(連結部)5bを導線6′に沿って平行に切断している。導線6′は銅であるので銅表面でレーザを強く反射し、導線6′にレーザで傷が付くことを防止する。レーザにより、絶縁シート5′のみが板厚方向に完全に切り込まれる。但しこのままでは、導線6′の周囲をシート部分5aが環状に覆っているので、絶縁シート5′が剥がれることはない。
【0024】
そこで次に図4(a)(b)の如くパンチ10とダイス11を用いて、導線6′の径方向両端部において絶縁シート5′の環状部5aにパンチ10で導線長手方向の切れ込み12を入れつつ、絶縁シート5′の切れ込み部分8を下方に押圧して導線6′から完全に切り離す。絶縁シート5′の切断カス13は矩形状で且つ中央に略半環状の部分を有した状態でダイス11の孔部15内に落下し、外部に廃棄される。導線6′の上側における円弧状のシート切断片14も同時に落下する。剥がれにくい場合はエアブロー等で強制的に剥がすことも可能である。
【0025】
あるいは、図3のレーザ照射工程で導線6′の径方向両端部に沿って導線長手方向に絶縁シート5′をレーザで切り込ませておいてもよい。この場合はパンチ10を用いなくともエアブロー等で簡単に切断カス13,14を剥離させることができる。
【0026】
パンチ10は一対の横断面矩形状のブレード状の突出部16を有し、一対の突出部16の間の内幅寸法は導線6′の外径よりも大きく、導線6′の周囲の絶縁シートの環状部5aの外径よりも小さい。各突出部16の先端は直角ないし刃状の鋭利なエッジ16aとなっている。ダイス11は絶縁シート5′のシート本体すなわち平板状の連結部5bを支持する一対の薄板状の突出部17と、一対の突出部17の間の孔部15とを少なくとも有している。
【0027】
フラット回路体3はダイス11で絶縁シート本体5bを支持された状態でパンチ10で導線6′の周囲を矩形状に打ち抜かれる。この状態を図5に示す。図5は図2を拡大したものである。全てのフラット回路体1〜4について上記同様に孔部7が形成され、孔部7内で導体6,6′が露出される。
【0028】
絶縁シート5,5′の孔あけは複数のパンチ10で複数箇所を同時に行ってもよく、あるいは一つのパンチ10でフラット回路体1〜4を水平方向に移動させながら一つづつ孔あけしてもよい。孔あけはフラット回路体1〜4ごとに一枚づつ行うことが、絶縁シート5,5′の剥離精度(露出導体6,6′の位置精度)や作業性の面から好ましい。
【0029】
次いで好ましくは図6の如く、少なくとも一方(本例では上層)のフラット回路体1の露出した導線6を孔部7内で他方(下層)のフラット回路体3の露出した導線6′に向けてフォーミング加工して、両導線6,6′を接触ないしほぼ接触させる。フォーミング加工は、絶縁シート5,5′の厚みの分だけ両導線6,6′が離間しているから必要となる。フォーミング加工によって次工程の両導線6,6′の溶接が電極の中心線上で位置ずれなく正確に行われる。
【0030】
図6のフォーミング加工の例はプレスで押圧突部18を上側のフラット回路体1の露出した導線6に押し付ける形態をとっている。この際、下側のフラット回路体3は未だセットされていない。押圧突部18の先端は略台形状や矩形状に形成される。少なくとも次の溶接工程における電極の先端が露出導線6にフラットに面当たりする形状にフォーミング加工されることが必要である。
【0031】
なお、上下両方の導線6,6′を同時に合わせ方向にフォーミング加工することも可能である。この場合は、上下から両導線6,6′を挟むように一対の押圧突部18を変位させる。
【0032】
フォーミング加工は全ての孔部7について複数の押圧突部18で同時に行ったり、あるいはフラット回路体1〜4を水平方向に移動させつつ一つの押圧突部18で各孔部7毎に行ってもよい。なお、次工程の溶接用の電極でフォーミング加工を兼ねることも可能である。但し、その場合はフォーミング加工と溶接とがほぼ同時に(僅かな時間差で)行われるので、両導線6,6′を位置ずれなく溶接するには(溶着を安定に行わせ、電気的接続の信頼性を高めるには)、やはり事前にフォーミング加工を行うことが好ましい。
【0033】
図7は上下のフラット回路体1,3の導線6,6′同士を孔部7内で一対の電極20,21によって抵抗溶接する状態を示すものである。孔部7は電極20,21の外寸法よりも少し大きく形成されている。一例として矩形状の電極20,21の一辺の長さは3mm程度である。両導線6,6′は一対の電極20,21で加圧されつつ通電されて溶着する。これにより、ハンダに較べて接続強度が高く、引張や剥がし方向の力に対して強い接続部が構成される。
【0034】
溶接接続性及び接触安定性を高めるべく、少なくとも一方ないし両方のフラット回路体1〜4の導線6,6′を全長に渡って予め錫メッキ等しておくことも可能である。錫メッキは接続部の酸化防止にも有効である。
【0035】
なお、フラット回路体1〜4の上下の方向性は必ずしも限定される必要はなく、例えば絶縁シート5,5′の孔部7の形成や両導線6,6′の溶接を左右方向から行う、すなわちフラット回路体1〜4を水平ではなく垂直に縦置きした状態で行うことも可能である。これら上下前後左右の方向性は後述の実施形態においても限定されるものではない。
【0036】
図8は、上記方法によって形成されたフラット回路体アセンブリ(相互接続体)22を絶縁プレート23に組み付ける状態を示すものである。フラット回路体アセンブリ22と絶縁プレート23とでフラット回路ユニットが構成される。
【0037】
本例でフラット回路体24〜28は上層に四枚、下層に一枚配置されている。上層のフラット回路体24〜27は下層の長いフラット回路体28に直交して横断方向に配置されている。フラット回路体24〜28の枚数や導線6,6′の本数は回路接続形態に応じて適宜設定される。各層の導線6,6′は等ピッチで平行に配列されている。上層と下層とで導線6,6′のピッチは異なっていてもよい。
【0038】
絶縁プレート23は合成樹脂で矩形状に形成され、平板状のプレート本体29の前後左右の端部に電線固定部30が一体に設けられている。電線とは各導線6,6′が絶縁シート5,5′の環状部分5aで覆われた部分を言い、特にフラット回路体24〜28の端末部において各導線6,6′が絶縁シート5,5′の環状部分5aで覆われつつシート本体(連結部)5bから切り離されて長手方向に一本づつ並列に突出した部分(図1の符号31)を含む。
【0039】
電線固定部30は電線31すなわち環状の絶縁シート部分5aの外径よりも幅狭なスリット部32を成す複数の挟持壁33で構成されている。複数の挟持壁33が絶縁プレート23の周囲に並列に立設されている。絶縁プレート23は電線固定部30と一体に樹脂成形される。
【0040】
上層のフラット回路体24〜27の両端末の電線部分すなわち端末電線31は絶縁プレート23の長辺側の固定部30で固定され、下層のフラット回路体28の両端末の電線部分31は絶縁プレート23の短辺側の固定部30で固定される。各端末電線31は隣接の一対の挟持壁33の間に上方からブレード等で圧入され、挟持壁33の弾性力でスリット部32内に抜け出しなく挟持固定される。
【0041】
各挟持壁33の間の凹所又は各挟持壁33の手前側(プレート本体29側)には圧接端子(図示せず)が配置される。各端末電線31は圧接端子で圧接されつつ挟持壁33で安定に挟持固定される。なお、圧接端子との圧接のみで電線31を固定させることも可能である。但し、引張や振動等に対しては挟持壁33等による電線固定部30が必要である。絶縁プレート30の外周の要部には電気接続箱への固定用の孔部34が設けられている。
【0042】
図9〜図12は、上記同様のフラット回路体アセンブリ及び絶縁プレートを備える電気接続箱の一実施形態を示すものである。
【0043】
この電気接続箱35は、合成樹脂製のケース(接続箱本体)36と、ケース36内に収容されるフラット回路体アセンブリ37と、ケース36内で回路体アセンブリ37を載置する絶縁プレート38と、回路体アセンブリ37を構成する上下二枚のフラット回路体1〜4(図1参照)の各電線31を接続する圧接部41を一方に有する複数の端子42(図12)と、端子42の他方の雄タブ状の電気接触部43を突出させたコネクタ部44と、端子(図示せず)の音叉状の電気接触部45(図11)に接続されるヒューズ(図示せず)とを少なくとも備える。
【0044】
回路体アセンブリ37はケース36の上壁46の開口47内に収容され、開口47はカバー(図示せず)で覆われる。カバーはケース36に係止手段である係止突起48(図11)と係合枠部(図示せず)で係止される。フラット回路体アセンブリ37は上層の二枚の平行なフラット回路体1,2と下層の二枚の平行な且つ上層側とは直交するフラット回路体3,4とで構成されている。
【0045】
各フラット回路体1〜4の導線6,6′は孔部7内で抵抗溶接されている。導線6,6′によっては孔部49で長手方向中間部で切断されて、二本ないしそれ以上の回路に分割されているものもある。各導線6,6′は等ピッチで平行に配列されている。
【0046】
図12の如く上下のフラット回路体1〜4は絶縁シート5,5′の環状部分5a同士が接して位置している。上下の導線6,6′は前述の如く一方ないし両方がフォーミング加工により接近した状態で溶接されることが好ましい。
【0047】
下層のフラット回路体3,4は絶縁プレート38の垂直なリブ50で支持されている。絶縁プレート50の下には下層(第一層)側のフラット回路体アセンブリ51が配置されている。両回路体アセンブリ37,51は絶縁プレート38を介して位置し、絶縁プレート38で両層37,51の絶縁が確実に行われている。絶縁プレート38の下面に接して第一層の上層のフラット回路体52が位置している。
【0048】
本形態で第一層の回路体アセンブリ51の上下のフラット回路体52,53の配索方向は上記上層(第二層)側の回路体アセンブリ37のフラット回路体1〜4の配索方向とは90°逆になっている(第二層側の下層の導線と第一層側の上層の導線とは平行に配置されている)。第一層の回路体アセンブリ51は下側(第一層)の絶縁プレート54で支持されている。各絶縁プレート38,54はケース36の内壁で支持されている。
【0049】
両層の回路体アセンブリ37,51のX方向(幅方向ないし短辺方向)の二層のフラット回路体3,4,52の導線の両端末はケース36の左右両側で各端子42の圧接部41に圧接されて各端子42の上下二層のタブ状接触部43に続き、図10の如く各電気接触部43はケース36と一体ないし別体の合成樹脂製のコネクタハウジング55内に突出して、左右両側のコネクタ44を構成している。コネクタ44には外部ワイヤハーネスのコネクタ(図示せず)が嵌合接続される。
【0050】
また、両層の回路体アセンブリ37,51のY方向(長手方向ないし長辺方向)の二層のフラット回路体1,2,53の導線の両端末はケース36の前後両側で各端子(図示せず)の圧接部41に圧接されている。各端子は図11の如く複数層の音叉状接触部45に続き、各音叉状接触部45はケース36と一体ないし別体の合成樹脂製のヒューズ装着部(ハウジング)56内に突出して、ブレード型ヒューズのタブ端子(図示せず)に接続される。
【0051】
このように二層のフラット回路体1〜4,52〜53を交差方向に接合して成る薄型の回路体アセンブリ37,51を用いることで、電気接続箱35内の空間を省スペースで活用でき、電気接続箱35のコンパクト化を図ることができると共に、何層にも回路体アセンブリ37,51を配設して多数のヒューズや多極コネクタを接続することができる。回路体アセンブリの層数は二層に限らずそれ以上ないしそれ以下とすることも容易である。
【0052】
電気接続箱35は自動車のパネル等に一対のブラケット57で固定される。ブラケット57はケース36の外壁のレール部58(図9)に離脱可能にスライド式に装着されている。車種等に応じてブラケット57のみを変更し、電気接続箱35の内部を共用することも可能である。
【0053】
その場合、回路体アセンブリ37,51のどの導線同士を溶接接続するか、また導線本数やフラット回路体の枚数をどの位にするか等は、ワイヤハーネスやヒューズ等の負荷側の回路仕様に応じて適宜変更される。この接続回路の変更が容易である点もこの回路体アセンブリ37,51の特徴である。
【0054】
なお、上記電気接続箱35はヒューズやコネクタを回路体アセンブリ37,51を介して接続させるものであるが、それ以外に電気部品としてリレーを接続したり、電子部品を含む電子ユニット等を接続するようにすることも可能である。また、一つの回路体アセンブリ51においてフラット回路体の枚数を二枚に限らず三枚ないしそれ以上に積層して、溶接で導線の層間接続を行わせることも可能である。
【0055】
また、二枚のフラット回路体を直交ではなく斜め方向に交差させたり、平行にした状態で直接接続させることも可能である。但し平行な場合は露出導線同士の位置決めが必要である。また、レーザによる絶縁シート5,5′の除去は矩形状に限らず円形等に行うことも可能である。この場合、それに見合った形状のパンチ(10)を容易する。また、レーザで絶縁シート5,5′を切断ではなく直接溶かして除去させることも可能である。
【0056】
また、溶接に代えて超音波溶着により導線6,6′の層間接続を行わせることも可能である。この場合は溶接用の電極20,21(図7)に代えて超音波ホーンを用いる。また、ビーム溶接で導線同士を溶着させることも可能である。また、端子の圧接部41に代えて端子の接続部をフラット回路体の導線6,6′に圧着や溶着等で接続させることも可能である。また、端子の電気接触部43,45の形状はタブ状や音叉状に限らず雌型としたり種々の形態に成型可能である。
【0057】
【発明の効果】
以上の如く、請求項1記載の発明によれば、フラット回路体の絶縁層のみをレーザで容易に且つ確実に除去することができるから、フラット回路体アセンブリの生産性が向上する。また、従来の布線板を用いない薄いフラット回路体アセンブリにより、構造がコンパクト化・低コスト化される。また、フラット回路体の所望の導線同士を接続させることができるから、種々の回路形態に容易に対応でき、フラット回路体アセンブリの共用化により、低コスト化が可能となる。
【0058】
請求項2記載の発明によれば、上記効果に加えて、レーザとパンチとでフラット回路体の絶縁層を一層正確に且つ容易に剥離させることができるから、フラット回路体アセンブリの生産性が一層向上する。
【0059】
請求項3記載の発明によれば、両層のフラット回路体の露出導線が接触ないしほぼ接触した状態で直接接続されるから、直接接続すなわち両フラット回路体の層間接続の信頼性が向上する。
【0060】
請求項4記載の発明によれば、レーザであけられた絶縁層の孔部に電極を挿入することで、両層のフラット回路体の露出導線同士を容易に且つ確実に溶着させることができ、電気的接続の信頼性が向上する。
【0061】
請求項5記載の発明によれば、複数枚の薄いフラット回路体を積層接続した薄いフラット回路体アセンブリにより、電気接続箱の薄型化が達成され、自動車等の狭い設置スペースに電気接続箱を容易に且つ確実に組み付けることができる。また、回路数を増やして多くの補機や電装品等の接続に対応することができる。また、圧接により、導線を露出させることなく端子に端末電線を容易に接続させることができる。また、車種等ごとにフラット回路体アセンブリを共用して電気接続箱のコストを低減させることができる。
【0062】
請求項6記載の発明によれば、フラット回路体同士を層間接続させた後、絶縁プレート上に組み付けることで、例えば従来の布線板に断面丸形の絶縁被覆電線を一筆書き状に布線する構造に較べて、絶縁プレートにフラット回路体を容易に組み付けることができ、生産性が向上する。また、絶縁プレートを介して複数層にフラット回路体アセンブリを配置することで、一層多くの接続回路に対応することができる。
請求項7記載の発明によれば、請求項5又は6と同様の効果を得ることができる。
【図面の簡単な説明】
【図1】本発明によるフラット回路体アセンブリの一実施形態を示す平面図である。
【図2】(a)はフラット回路体の要部を示す平面図、(b)は(a)のA−A断面図である。
【図3】フラット回路体の製造方法の第一工程(切り込み工程)を示す要部平面図である。
【図4】(a)はフラット回路体の製造方法の第二工程(打ち抜き工程)を示す要部断面図、(b)は同じく打ち抜き時の状態を示す要部断面図である。
【図5】打ち抜きで導線を露出させた状態を示す要部平面図である。
【図6】フラット回路体の製造方法の第三工程(フォーミング工程)を示す要部断面図である。
【図7】フラット回路体アセンブリの層間接続方法の一形態を示す要部斜視図である。
【図8】フラット回路体アセンブリを絶縁プレートにセットする状態を示す分解斜視図である。
【図9】フラット回路体アセンブリ等をケース内に組み付けた電気接続箱の一実施形態を示す平面図である。
【図10】同じく電気接続箱を示す一側面図である。
【図11】同じく電気接続箱を示す正面図である。
【図12】図9のB−B断面図である。
【図13】(a)は従来のフラット回路体アセンブリの製造方法の一形態を示す分解斜視図、(b)は同じく回路体アセンブリを示す断面図である。
【図14】従来の電気接続箱の一形態を示す分解斜視図である。
【符号の説明】
1〜4、24〜28 フラット回路体
5,5′      絶縁シート(絶縁層)
6,6′      導線
8         切れ込み部分
10        パンチ
22,37     フラット回路体アセンブリ
23,38     絶縁プレート
31        端末電線
35        電気接続箱
36        ケース(接続箱本体)
41        圧接部
42        端子
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for connecting flat circuit bodies to each other for interlayer connection of flat circuit bodies having a plurality of electric wires in parallel, a method for manufacturing an electric junction box to which the flat circuit assembly is mounted, and the electric junction box. Things.
[0002]
[Prior art]
FIGS. 13 (a) and 13 (b) show a conventional connection structure between flat circuit bodies and an embodiment of a connection method (see Japanese Patent Application Laid-Open No. H8-17259).
The flat circuit bodies 61 and 62 each include an insulating layer 63 made of a synthetic resin and a plurality of flat conductors 64 embedded in the insulating layer 63. A hole 65 is provided on one surface side of the insulating layer 63 corresponding to each flat conductor 64, and the holes 65 of the flat circuit bodies 61 and 62 are opposed to each other. Connected to each other. Thereby, both flat circuit bodies 61 and 62 are connected to each other.
[0003]
However, in the connection structure and the connection method between the flat circuit bodies, a lot of man-hours are required for the operation of providing the hole 65 only on one side of the insulating layer 63 or connecting the flat conductors 64 via the solder 66. And the need for accurate work.
[0004]
On the other hand, FIG. 14 shows one form of a conventional electric junction box (see Japanese Utility Model Laid-Open No. 7-9023).
The electric connection box 71 includes an upper cover 72 and a lower cover 73 made of synthetic resin, that is, a connection box main body, and an electric wiring board 74 and a bus bar wiring board 75 that are stacked and housed between the covers 72, 73. ing.
[0005]
The electric wire wiring board 74 includes an insulating substrate 76 made of synthetic resin, a plurality of insulated wires 77 laid on the surface of the insulating substrate 76, and a terminal 78 that penetrates the insulating substrate 76 and is pressed against the electric wire 77. Have. The terminal 78 has a press contact portion 78a on one side and a male tab-like electric contact portion 78b on the other side.
[0006]
The bus bar wiring board 75 includes an insulating substrate 79 and a plurality of bus bars 80 arranged on the surface of the insulating substrate 79. The bus bar 80 has a male tab-shaped terminal 81 which is integrally raised or lowered. The terminals 78 and 81 project into the housings 82 and 83 of the upper cover 72 and the lower cover 73, and the terminals 78 and 81 and the housings 82 and 83 constitute a connector. An external wire harness connector (not shown) is connected to the connector. It is also possible to connect fuses and relays in the housings 82 and 83 via relay terminals instead of the connectors.
[0007]
However, in the above-described conventional electric connection box 71, the structure is enlarged and weighted by a plurality of rigid insulating substrates 76 and 79, a large number of electric wires 77, a heavy bus bar 80, and the like, and a connection circuit is increased. There is a problem that the number is limited, and a problem that many man-hours are required for wiring work of the electric wires 77 and laying work of the bus bar.
[0008]
In order to solve this problem, even when the flat circuit bodies 61 and 62 of FIG. 13 are arranged in the electric connection box 71, the workability of connection between the flat circuit bodies and the reliability of the electrical connection are further improved. Needed.
[0009]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION In view of the above, the present invention provides a method for connecting flat circuit bodies which is compact, can support many connection circuits, and can improve the reliability of interlayer connection, and manufactures an electric junction box using the method. It is an object to provide a method and an electrical junction box.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a method for interconnecting flat circuit bodies according to claim 1 of the present invention comprises removing an insulating layer of the flat circuit body with a laser to expose a conductor of the flat circuit body, The exposed conductors of both flat circuit bodies are welded to each other in a state where the bodies are stacked.
With the above configuration, the insulating layer of the flat circuit body is easily and reliably removed by laser irradiation. The laser reflects off the surface of the metal wire, leaving no damage to the wire and removing only the insulating layer. Then, the exposed conductors are welded to each other, whereby interlayer connection between the flat circuit bodies is performed. The conductors are exposed at desired (required) positions, and the desired (required) conductors of each layer are directly connected to each other.
[0011]
A method for interconnecting flat circuit bodies according to claim 2 is the method for interconnecting flat circuit bodies according to claim 1, wherein after the laser is cut into the insulating layer, the cut portion is punched out with a punch to form the conductive wire. Is exposed.
According to the above configuration, a cut is made in the insulating layer with accurate dimensions by laser irradiation, and the cut portion is separated from the insulating layer main body. Then, the insulating layer is easily separated from the conductor by pressing the cut portion with a punch.
[0012]
A method for interconnecting flat circuit bodies according to claim 3 is the method for interconnecting flat circuit bodies according to claim 1 or 2, wherein after exposing the conductor, at least one exposed conductor is exposed to the other by forming. It is characterized by contacting or substantially contacting the conductor.
According to the above configuration, one exposed conductor is deformed while being pressed by the forming process toward the other exposed conductor, and comes into contact with or almost comes into contact with the other exposed conductor. Thereby, both exposed conductors are accurately positioned, and the direct connection of both exposed conductors in the next step is accurately performed.
[0013]
According to a fourth aspect of the present invention, in the connecting method of the flat circuit bodies according to any one of the first to third aspects, the welding of the exposed conductors is performed by resistance welding. Features.
With the above configuration, the electrodes are inserted into the holes of the insulating layer opened by the laser, and the exposed conductors are easily and reliably resistance-welded to each other.
[0014]
According to a fifth aspect of the present invention, there is provided a method for manufacturing an electrical junction box, comprising: housing a flat circuit assembly formed by the method for interconnecting flat circuit bodies according to any one of claims 1 to 4 in a junction box main body; The terminal wire of the flat circuit assembly is press-contacted to the press-contact portion of the terminal on the connection box body side.
With the above configuration, a thin flat circuit assembly is obtained by laminating a plurality of thin flat circuit assemblies, and the flat circuit assembly is accommodated in the electrical junction box with a small space. Then, by connecting the terminal wire of the flat circuit assembly to the pressure contact portion of the terminal, an electric component such as a fuse is connected to the terminal, or a connector of the external wire harness is connected to the connector containing the terminal, and the flat wire is connected to the terminal. Many circuit connections between the circuit body and electrical components, external wire harnesses, and the like can be obtained. No stripping is required for the connection between the press contact portion of the terminal and the terminal wire.
[0015]
According to a sixth aspect of the present invention, there is provided a method for manufacturing an electrical junction box according to the fifth aspect, wherein the flat circuit assembly is set on an insulating plate.
According to the above configuration, the terminal wire of the flat circuit assembly can be fixed to the insulating plate, and at the same time, the terminal wire can be efficiently connected to the press-contact portion of the terminal on the insulating plate. In addition, the flat circuit assembly can be arranged in a plurality of layers via the insulating plate. Each flat circuit assembly is reliably insulated by an insulating plate.
[0016]
An electric connection box according to claim 7 is manufactured by the method for manufacturing an electric connection box according to claim 5 or 6.
With the above configuration, the same operation and effect as those of the fifth or sixth aspect can be obtained. That is, the flat circuit assembly is housed in a small space in the electrical junction box. In addition, many circuit connections between the flat circuit body and electric components, external wire harnesses, and the like can be obtained via the terminals. In addition, the terminal wires of the flat circuit body can be fixed to the insulating plate, and at the same time, the terminal wires can be efficiently connected to the pressure contact parts of the terminals on the insulating plate. A body assembly can also be placed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of a connection structure between flat circuit bodies according to the present invention.
[0018]
The flat circuit bodies 1 to 4 are vertically stacked. In this embodiment, the upper flat circuit bodies 1 and 2 are two, and the lower flat circuit bodies 3 and 4 are two. The number and length of each of the flat circuit bodies 1 to 4 are not limited to this embodiment, and are set as appropriate. Each of the flat circuit bodies 1 to 4 has a thin insulating sheet (insulating layer or insulator) 5, 5 'made of a synthetic resin and a plurality of round cross sections embedded in the insulating sheets 5, 5' in parallel. And straight conductors (core wires or conductors) 6, 6 '. The upper insulating sheet and the conductive wire are denoted by reference numerals 5 and 6, and the lower insulating sheet and the conductive wire are denoted by reference numerals 5 'and 6'.
[0019]
As the insulating sheets 5, 5 ', polyvinyl chloride, polyethylene, polyester, polyurethane, or PET or PEN in the form of a film is used. The conducting wires 6, 6 'are formed of one copper wire. The conductive wires 6, 6 'are sandwiched between the insulating sheets 5, 5', or are insert-molded in the insulating sheets 5, 5 '.
[0020]
The upper and lower flat circuit bodies 1 to 4 are overlapped in the plate thickness direction and are in contact with each other, and the upper and lower conductive wires 6, 6 'are positioned orthogonally. Each conductive wire 6, 6 'is covered with an insulating sheet 5, 5' over the entire length including the end. In the upper and lower flat circuit bodies 1 to 4, a plurality of rectangular holes 7 are provided through insulating sheets 5 and 5 'at required positions in the longitudinal direction of required conductive wires 6 and 6'.
[0021]
As shown in FIGS. 2A and 2B, a part of the flat circuit body 3 is representatively shown, and a conductive wire 6 ′ of the flat circuit body 3 is exposed at the center of the hole 7. The hole 7 is formed in a rectangular shape from the annular insulating sheet portion 5a around the conductor to the thin sheet body (connection portion) 5b on both sides of the conductor 6 '.
[0022]
The hole 7 can be easily and accurately formed by a laser, a punch, and a die. With the holes 7 of the upper and lower flat circuit bodies 1 to 4 facing each other, the conductive wires 6 and 6 ′ of the upper and lower layers are directly connected in the hole 7 by welding. Hereinafter, the method will be described using the flat circuit body 3.
[0023]
First, as shown in FIG. 3A, a rectangular cut is made in the insulating sheet 5 'by laser. The cut (cut portion) 8 traverses the conductor 6 'in the radial direction as indicated by reference numeral 8a, and cuts the sheet body (connecting portion) 5b in parallel with the conductor 6' as indicated by reference numeral 8b. Since the conductive wire 6 'is made of copper, the laser reflects strongly on the copper surface to prevent the conductive wire 6' from being damaged by the laser. Only the insulating sheet 5 'is completely cut in the thickness direction by the laser. However, in this state, since the sheet portion 5a covers the periphery of the conductive wire 6 'in an annular shape, the insulating sheet 5' does not peel off.
[0024]
Then, as shown in FIGS. 4 (a) and 4 (b), the punch 10 and the die 11 are used to make a notch 12 in the longitudinal direction of the conducting wire with the punch 10 in the annular portion 5a of the insulating sheet 5 'at both radial ends of the conducting wire 6'. While inserting, the cut portion 8 of the insulating sheet 5 'is pressed downward to be completely separated from the conductor 6'. The cutting waste 13 of the insulating sheet 5 'falls into the hole 15 of the die 11 in a state of being rectangular and having a substantially semi-annular portion at the center, and is discarded outside. The arc-shaped sheet cutting piece 14 above the conducting wire 6 'also falls at the same time. If it is difficult to peel off, it can be forcibly peeled off by air blow or the like.
[0025]
Alternatively, in the laser irradiation step of FIG. 3, the insulating sheet 5 'may be cut in the longitudinal direction of the conducting wire with a laser along both radial ends of the conducting wire 6'. In this case, the cutting residues 13 and 14 can be easily peeled off by air blow or the like without using the punch 10.
[0026]
The punch 10 has a pair of blade-shaped protrusions 16 having a rectangular cross section, an inner width between the pair of protrusions 16 is larger than an outer diameter of the conductor 6 ′, and an insulating sheet around the conductor 6 ′. Is smaller than the outer diameter of the annular portion 5a. The tip of each protrusion 16 is a sharp edge 16a having a right angle or a blade shape. The die 11 has at least a pair of thin plate-shaped protrusions 17 that support the sheet body of the insulating sheet 5 ′, that is, the flat plate-shaped connection portion 5 b, and a hole 15 between the pair of protrusions 17.
[0027]
The flat circuit body 3 is punched by a punch 10 into a rectangular shape around the conductor 6 ′ with the insulating sheet body 5 b supported by the die 11. This state is shown in FIG. FIG. 5 is an enlarged view of FIG. The holes 7 are formed in all the flat circuit bodies 1 to 4 in the same manner as described above, and the conductors 6 and 6 ′ are exposed in the holes 7.
[0028]
Drilling of the insulating sheets 5 and 5 ′ may be performed simultaneously at a plurality of locations with a plurality of punches 10, or may be performed one by one while moving the flat circuit bodies 1 to 4 in a horizontal direction with one punch 10. Is also good. Drilling is preferably performed one by one for each of the flat circuit bodies 1 to 4 from the viewpoint of peeling accuracy of the insulating sheets 5 and 5 '(positional accuracy of the exposed conductors 6 and 6') and workability.
[0029]
Then, preferably, as shown in FIG. 6, at least one (the upper layer in this example) of the exposed conductor 6 of the flat circuit body 1 is directed to the exposed conductor 6 'of the other (the lower layer) flat circuit body 3 in the hole portion 7. Forming is performed so that the two conductive wires 6, 6 'are in contact with or substantially in contact with each other. The forming process is necessary because the conductors 6, 6 'are separated by the thickness of the insulating sheets 5, 5'. By the forming process, the welding of the two conductors 6, 6 'in the next step is performed accurately on the center line of the electrode without displacement.
[0030]
In the example of the forming process in FIG. 6, the pressing projection 18 is pressed against the exposed conductive wire 6 of the upper flat circuit body 1 by a press. At this time, the lower flat circuit body 3 has not been set yet. The tip of the pressing projection 18 is formed in a substantially trapezoidal or rectangular shape. It is necessary that at least the tip of the electrode in the next welding step is formed into a shape that flatly contacts the exposed conductive wire 6.
[0031]
It is also possible to simultaneously form both upper and lower conductors 6, 6 'in the joining direction. In this case, the pair of pressing projections 18 are displaced from above and below so as to sandwich the conductive wires 6 and 6 ′.
[0032]
The forming process may be performed simultaneously for all the holes 7 with a plurality of pressing protrusions 18 or may be performed for each hole 7 with one pressing protrusion 18 while moving the flat circuit bodies 1 to 4 in the horizontal direction. Good. In addition, it is also possible to double the forming process with the electrode for welding in the next step. However, in this case, since the forming process and the welding are performed almost simultaneously (with a slight time difference), it is necessary to weld the two conductive wires 6 and 6 'without any positional deviation (the welding is performed stably and the reliability of the electrical connection is ensured). In order to improve the properties), it is also preferable to perform a forming process in advance.
[0033]
FIG. 7 shows a state in which the conductors 6, 6 'of the upper and lower flat circuit bodies 1, 3 are resistance-welded in the hole 7 by a pair of electrodes 20, 21. The hole 7 is formed slightly larger than the outer dimensions of the electrodes 20 and 21. As an example, the length of one side of the rectangular electrodes 20 and 21 is about 3 mm. The two conductive wires 6, 6 'are welded by being energized while being pressed by the pair of electrodes 20, 21. Thereby, the connection strength is higher than that of the solder, and a connection portion that is strong against the force in the pulling or peeling direction is formed.
[0034]
In order to improve the weldability and contact stability, it is possible to pre-plate the entire length of at least one or both of the conductors 6, 6 'of the flat circuit bodies 1 to 4 with tin plating or the like. Tin plating is also effective in preventing oxidation of the connection.
[0035]
Note that the vertical direction of the flat circuit bodies 1 to 4 is not necessarily limited. For example, the formation of the holes 7 in the insulating sheets 5 and 5 ′ and the welding of the conductors 6 and 6 ′ are performed from the left and right directions. That is, it is also possible to perform the operation in a state where the flat circuit bodies 1 to 4 are vertically arranged instead of horizontally. These directions of up, down, front, back, left, and right are not limited in the embodiment described later.
[0036]
FIG. 8 shows a state where the flat circuit body assembly (interconnect) 22 formed by the above method is assembled to the insulating plate 23. The flat circuit unit 22 and the insulating plate 23 constitute a flat circuit unit.
[0037]
In this example, four flat circuit bodies 24 to 28 are arranged in the upper layer and one in the lower layer. The upper flat circuit bodies 24 to 27 are arranged in a transverse direction orthogonal to the lower long flat circuit body 28. The number of the flat circuit bodies 24 to 28 and the number of the conductors 6, 6 'are appropriately set according to the circuit connection form. The conductors 6, 6 'of each layer are arranged in parallel at an equal pitch. The pitch of the conductive wires 6, 6 'may be different between the upper layer and the lower layer.
[0038]
The insulating plate 23 is formed in a rectangular shape with a synthetic resin, and the wire fixing portions 30 are integrally provided at front, rear, left and right ends of a flat plate body 29. The electric wire is a portion in which each of the conductors 6, 6 'is covered with an annular portion 5a of the insulating sheet 5, 5'. While being covered by the annular portion 5a of 5 ', it includes a portion (reference numeral 31 in FIG. 1) which is cut off from the sheet body (connection portion) 5b and protrudes one by one in the longitudinal direction.
[0039]
The electric wire fixing portion 30 is constituted by a plurality of sandwiching walls 33 forming a slit portion 32 narrower than the outer diameter of the electric wire 31, that is, the annular insulating sheet portion 5a. A plurality of holding walls 33 are erected in parallel around the insulating plate 23. The insulating plate 23 is resin-molded integrally with the wire fixing portion 30.
[0040]
The wire portions at both ends of the upper flat circuit bodies 24 to 27, that is, the terminal wires 31, are fixed by the fixing portions 30 on the long sides of the insulating plate 23, and the wire portions 31 at both ends of the lower flat circuit body 28 are 23 is fixed by the fixing portion 30 on the short side. Each terminal wire 31 is press-fitted between the pair of adjacent holding walls 33 from above with a blade or the like, and is held and fixed without slipping into the slit portion 32 by the elastic force of the holding walls 33.
[0041]
A pressure contact terminal (not shown) is arranged in a recess between the holding walls 33 or on the near side of the holding walls 33 (on the plate body 29 side). Each terminal wire 31 is stably fixed and held by the holding wall 33 while being pressed by the press contact terminal. In addition, it is also possible to fix the electric wire 31 only by press contact with the press contact terminal. However, for tension, vibration, and the like, the wire fixing portion 30 by the sandwiching wall 33 and the like is required. A hole 34 for fixing to the electric connection box is provided in a main part on the outer periphery of the insulating plate 30.
[0042]
9 to 12 show an embodiment of an electric junction box including a flat circuit assembly and an insulating plate similar to the above.
[0043]
The electric junction box 35 includes a case (junction box body) 36 made of synthetic resin, a flat circuit assembly 37 housed in the case 36, an insulating plate 38 on which the circuit assembly 37 is placed in the case 36. A plurality of terminals 42 (FIG. 12) each having a press-contact portion 41 for connecting each electric wire 31 of the upper and lower two flat circuit bodies 1 to 4 (see FIG. 1) constituting the circuit body assembly 37; At least a connector portion 44 from which the other male tab-shaped electric contact portion 43 is projected and a fuse (not shown) connected to a tuning fork-shaped electric contact portion 45 (FIG. 11) of a terminal (not shown). Prepare.
[0044]
The circuit assembly 37 is housed in an opening 47 in the upper wall 46 of the case 36, and the opening 47 is covered with a cover (not shown). The cover is locked to the case 36 by a locking projection 48 (FIG. 11) serving as a locking means and an engagement frame (not shown). The flat circuit assembly 37 is composed of two parallel flat circuit bodies 1 and 2 in the upper layer and two parallel flat circuit bodies 3 and 4 in the lower layer that are orthogonal to the upper layer side.
[0045]
The conducting wires 6, 6 'of each flat circuit body 1-4 are resistance-welded in the hole 7. Some of the conductors 6, 6 'may be cut at the intermediate portion in the longitudinal direction at the hole 49 and divided into two or more circuits. The conductors 6, 6 'are arranged in parallel at an equal pitch.
[0046]
As shown in FIG. 12, the upper and lower flat circuit bodies 1 to 4 are located such that the annular portions 5a of the insulating sheets 5, 5 'are in contact with each other. As described above, it is preferable that one or both of the upper and lower conductive wires 6, 6 'are welded in a state where they are close to each other by forming.
[0047]
The lower flat circuit bodies 3 and 4 are supported by vertical ribs 50 of the insulating plate 38. Below the insulating plate 50, a lower layer (first layer) side flat circuit assembly 51 is disposed. The two circuit body assemblies 37 and 51 are located via the insulating plate 38, and the insulating plate 38 ensures insulation of the two layers 37 and 51. The upper flat circuit body 52 is located in contact with the lower surface of the insulating plate 38.
[0048]
In the present embodiment, the wiring direction of the upper and lower flat circuit bodies 52 and 53 of the first layer circuit body assembly 51 is the same as the wiring direction of the flat circuit bodies 1 to 4 of the upper layer (second layer) side circuit body assembly 37. Are inverted by 90 ° (the lower conductive wire on the second layer side and the upper conductive wire on the first layer side are arranged in parallel). The first layer circuit assembly 51 is supported by a lower (first layer) insulating plate 54. Each of the insulating plates 38 and 54 is supported by the inner wall of the case 36.
[0049]
Both ends of the conductors of the two-layer flat circuit bodies 3, 4, and 52 in the X direction (width direction or short side direction) of the circuit body assemblies 37 and 51 of both layers are press-fitted to the terminals 42 on the left and right sides of the case 36. Following the tab-shaped contact portions 43 of the upper and lower two layers of each terminal 42 by being pressed against the terminal 41, each electric contact portion 43 projects into a synthetic resin connector housing 55 integrated with or separate from the case 36 as shown in FIG. And connectors 44 on both the left and right sides. An external wire harness connector (not shown) is fitted and connected to the connector 44.
[0050]
Also, both ends of the conductors of the two-layer flat circuit bodies 1, 2, 53 in the Y direction (longitudinal direction or long side direction) of the circuit body assemblies 37, 51 of both layers are connected to respective terminals (FIG. (Not shown). Each terminal follows a plurality of layers of tuning fork-like contact portions 45 as shown in FIG. 11, and each tuning fork-like contact portion 45 projects into a synthetic resin fuse mounting portion (housing) 56 that is integral with or separate from the case 36 and is a blade. It is connected to the tab terminal (not shown) of the type fuse.
[0051]
By using the thin circuit assemblies 37 and 51 formed by joining the two layers of flat circuit bodies 1 to 4 and 52 to 53 in the cross direction, the space in the electric junction box 35 can be utilized with a small space. In addition, the electrical junction box 35 can be made more compact, and the circuit assemblies 37 and 51 can be arranged in multiple layers to connect a large number of fuses and multi-pole connectors. The number of layers of the circuit assembly is not limited to two, but can easily be more or less.
[0052]
The electric connection box 35 is fixed to a panel or the like of an automobile with a pair of brackets 57. The bracket 57 is slidably mounted on a rail 58 (FIG. 9) on the outer wall of the case 36 so as to be detachable. It is also possible to change only the bracket 57 according to the type of vehicle or the like and share the inside of the electric connection box 35.
[0053]
In this case, which of the conductors of the circuit assemblies 37 and 51 are connected by welding, and the number of conductors and the number of flat circuit bodies are determined according to the circuit specifications on the load side such as a wire harness and a fuse. Is appropriately changed. Another feature of the circuit assemblies 37 and 51 is that the connection circuit can be easily changed.
[0054]
The electric connection box 35 connects fuses and connectors via the circuit assemblies 37 and 51. In addition, a relay is connected as an electric component, and an electronic unit including an electronic component is connected. It is also possible to do so. Further, the number of flat circuit bodies in one circuit body assembly 51 is not limited to two, but may be three or more, and interlayer connection of conductive wires may be performed by welding.
[0055]
It is also possible to cross two flat circuit bodies not obliquely but diagonally, or to connect them directly in parallel. However, when parallel, it is necessary to position exposed conductors. Further, the removal of the insulating sheets 5 and 5 ′ by the laser is not limited to the rectangular shape, but may be performed in a circular shape or the like. In this case, a punch (10) having a shape corresponding thereto is facilitated. Further, the insulating sheets 5, 5 'can be directly melted and removed by laser instead of cutting.
[0056]
In addition, it is also possible to perform the interlayer connection between the conductive wires 6, 6 'by ultrasonic welding instead of welding. In this case, an ultrasonic horn is used instead of the welding electrodes 20, 21 (FIG. 7). It is also possible to weld the conductors by beam welding. Also, instead of the terminal pressure contact portion 41, the terminal connection portion can be connected to the conductors 6, 6 'of the flat circuit body by crimping or welding. Further, the shape of the electric contact portions 43 and 45 of the terminal is not limited to the tab shape or the tuning fork shape, but may be a female type or may be formed into various forms.
[0057]
【The invention's effect】
As described above, according to the first aspect of the present invention, only the insulating layer of the flat circuit body can be easily and reliably removed by the laser, so that the productivity of the flat circuit body assembly is improved. In addition, the structure is reduced in size and cost by a thin flat circuit assembly that does not use a conventional wiring board. In addition, since desired conductors of the flat circuit body can be connected to each other, it is possible to easily cope with various circuit forms, and the cost can be reduced by sharing the flat circuit body assembly.
[0058]
According to the second aspect of the present invention, in addition to the above effects, the insulating layer of the flat circuit body can be more accurately and easily peeled off with the laser and the punch, so that the productivity of the flat circuit body assembly is further improved. improves.
[0059]
According to the third aspect of the present invention, since the exposed conductive wires of the flat circuit bodies of both layers are directly connected in a state of contact or almost contact, the reliability of the direct connection, that is, the interlayer connection of both flat circuit bodies is improved.
[0060]
According to the invention of claim 4, by inserting the electrode into the hole of the insulating layer opened by the laser, the exposed conductors of the flat circuit bodies of both layers can be easily and reliably welded to each other, The reliability of the electrical connection is improved.
[0061]
According to the fifth aspect of the present invention, a thin flat circuit assembly in which a plurality of thin flat circuit bodies are stacked and connected achieves a thin electric junction box, and can be easily installed in a narrow installation space of an automobile or the like. And can be securely assembled. Further, by increasing the number of circuits, it is possible to cope with the connection of many auxiliary devices, electrical components and the like. Further, the terminal wire can be easily connected to the terminal by exposing the conductive wire by the pressure welding. Further, the flat circuit assembly can be shared for each vehicle type and the like, so that the cost of the electric junction box can be reduced.
[0062]
According to the invention as set forth in claim 6, after the flat circuit bodies are connected to each other between the layers, the flat circuit bodies are assembled on the insulating plate, so that, for example, a conventional insulated wire having a round cross section is wired in a one-stroke pattern on a conventional wiring board. As compared with the structure in which the flat circuit body is formed, the flat circuit body can be easily attached to the insulating plate, and the productivity is improved. Further, by arranging the flat circuit assembly in a plurality of layers via the insulating plate, it is possible to cope with more connection circuits.
According to the seventh aspect of the invention, the same effect as the fifth or sixth aspect can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a flat circuit assembly according to the present invention.
FIG. 2A is a plan view showing a main part of a flat circuit body, and FIG. 2B is a sectional view taken along line AA of FIG.
FIG. 3 is a plan view of a main part showing a first step (cutting step) of the method for manufacturing a flat circuit body.
FIG. 4A is a cross-sectional view of a main part showing a second step (punching step) of the method for manufacturing a flat circuit body, and FIG. 4B is a cross-sectional view of the main part showing a state at the time of punching.
FIG. 5 is a main part plan view showing a state in which a conductive wire is exposed by punching.
FIG. 6 is a fragmentary cross-sectional view showing a third step (forming step) of the method for manufacturing a flat circuit body.
FIG. 7 is a perspective view of an essential part showing an embodiment of a method for connecting layers of a flat circuit assembly.
FIG. 8 is an exploded perspective view showing a state where the flat circuit assembly is set on an insulating plate.
FIG. 9 is a plan view showing an embodiment of an electric junction box in which a flat circuit assembly and the like are assembled in a case.
FIG. 10 is a side view showing the same electrical junction box.
FIG. 11 is a front view showing the electric junction box.
FIG. 12 is a sectional view taken along the line BB of FIG. 9;
FIG. 13A is an exploded perspective view showing one embodiment of a conventional method of manufacturing a flat circuit assembly, and FIG. 13B is a cross-sectional view showing the same circuit assembly.
FIG. 14 is an exploded perspective view showing one embodiment of a conventional electric junction box.
[Explanation of symbols]
1-4, 24-28 Flat circuit
5,5 'insulating sheet (insulating layer)
6,6 'conductor
8 Notch
10 punches
22,37 Flat circuit assembly
23, 38 Insulation plate
31 Terminal wire
35 electrical junction box
36 case (junction box body)
41 Pressure contact
42 terminals

Claims (7)

フラット回路体の絶縁層をレーザで除去して該フラット回路体の導線を露出させ、各フラット回路体を積層した状態で両フラット回路体の露出導線を相互に溶着させることを特徴とするフラット回路体相互の接続方法。A flat circuit characterized in that the insulating layer of the flat circuit body is removed by a laser to expose the conductor of the flat circuit body, and the exposed conductors of both flat circuit bodies are welded to each other in a state where the flat circuit bodies are stacked. How to connect each other. 前記絶縁層に前記レーザで切れ込みを入れた後、パンチで切れ込み部分を打ち抜いて前記導線を露出させることを特徴とする請求項1記載のフラット回路体相互の接続方法。2. The method of connecting flat circuit bodies according to claim 1, wherein after the laser is cut into the insulating layer, the cut is punched out with a punch to expose the conductive wire. 前記導線を露出させた後、フォーミング加工で少なくとも一方の露出導線を他方の露出導線に接触ないし略接触させることを特徴とする請求項1又は2記載のフラット回路体相互の接続方法。The method of connecting flat circuit bodies according to claim 1 or 2, wherein after the conductor is exposed, at least one exposed conductor is brought into contact with or substantially in contact with the other exposed conductor by a forming process. 前記露出導体相互の溶着を抵抗溶接で行わせることを特徴とする請求項1〜3の何れか1項に記載のフラット回路体相互の接続方法。The method of connecting flat circuit bodies according to claim 1, wherein the welding of the exposed conductors is performed by resistance welding. 請求項1〜4の何れか1項に記載のフラット回路体相互の接続方法で形成したフラット回路体アセンブリを接続箱本体内に収容し、該フラット回路体アセンブリの端末電線を接続箱本体側の端子の圧接部に圧接することを特徴とする電気接続箱の製造方法。A flat circuit body assembly formed by the method for connecting flat circuit bodies according to any one of claims 1 to 4 is housed in a connection box body, and a terminal wire of the flat circuit body assembly is connected to a connection box body side. A method for manufacturing an electric junction box, wherein the electric connection box is pressure-contacted to a terminal pressure-contact portion. 前記フラット回路体アセンブリを絶縁プレート上にセットすることを特徴とする請求項5記載の電気接続箱の製造方法。6. The method according to claim 5, wherein the flat circuit assembly is set on an insulating plate. 請求項5又は6記載の電気接続箱の製造方法で製造されたことを特徴とする電気接続箱。An electrical junction box manufactured by the method for manufacturing an electrical junction box according to claim 5.
JP2002184264A 2002-06-25 2002-06-25 Manufacturing method of electrical junction box Expired - Lifetime JP3976627B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007052996A (en) * 2005-08-17 2007-03-01 Auto Network Gijutsu Kenkyusho:Kk Flat cabling material and connection method of flat cabling material
JP2008220165A (en) * 2004-03-31 2008-09-18 Mitsubishi Cable Ind Ltd Joint box using circuit board
JP2014218224A (en) * 2013-05-10 2014-11-20 古河電気工業株式会社 Wire harness
JP2015060707A (en) * 2013-09-18 2015-03-30 古河電気工業株式会社 Method of connecting flat cable to connection terminal, method of producing flat cable-provided connector unit, connector assembly, flat cable-provided connector, and flat cable-provided connector unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008220165A (en) * 2004-03-31 2008-09-18 Mitsubishi Cable Ind Ltd Joint box using circuit board
JP2007052996A (en) * 2005-08-17 2007-03-01 Auto Network Gijutsu Kenkyusho:Kk Flat cabling material and connection method of flat cabling material
JP2014218224A (en) * 2013-05-10 2014-11-20 古河電気工業株式会社 Wire harness
JP2015060707A (en) * 2013-09-18 2015-03-30 古河電気工業株式会社 Method of connecting flat cable to connection terminal, method of producing flat cable-provided connector unit, connector assembly, flat cable-provided connector, and flat cable-provided connector unit

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