JP2004103757A - Emi reducing device - Google Patents

Emi reducing device Download PDF

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Publication number
JP2004103757A
JP2004103757A JP2002262386A JP2002262386A JP2004103757A JP 2004103757 A JP2004103757 A JP 2004103757A JP 2002262386 A JP2002262386 A JP 2002262386A JP 2002262386 A JP2002262386 A JP 2002262386A JP 2004103757 A JP2004103757 A JP 2004103757A
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Japan
Prior art keywords
sheet metal
metal member
ferrite core
cable
emi
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JP2002262386A
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Japanese (ja)
Inventor
So Ishikawa
石川 宗
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Seiko Epson Corp
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Seiko Epson Corp
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Priority to JP2002262386A priority Critical patent/JP2004103757A/en
Publication of JP2004103757A publication Critical patent/JP2004103757A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an EMI reducing device which reduces EMI in the circumference of a cable in a simple constitution. <P>SOLUTION: An FFC 34 is inserted into a ferrite core 52 to reduce the EMI due to the FFC. With the elastic force of a spring part of a 2nd sheet metal member, the FFC 34 is pressed against a presser part of the 2nd sheet metal member with a ground potential and a 1st sheet metal member with the ground potential to further reduce the EMI due to the FFC 34. The 1st sheet metal member 24 and 2nd sheet metal member 38 are capable of restraining the ferrite core 52 to a specified position and cooperatively clamping the FFC 34, and locked with the elastic force of a spring part of the 2nd sheet metal member 38. Consequently, the EMI reducing device is realized having a simple constitution of three components, i.e. the 1st sheet metal member 24, 2nd sheet metal member 38, and ferrite core 52. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、電子機器のEMC(electromagnetic compatibility)向上に関し、特にフェライトコア等によりケーブル周辺のEMI(electromagnetic interference)を低減するEMI低減装置に関する。
【0002】
【従来の技術】
従来、フェライトコアにケーブルを挿通することでそのケーブルに起因するEMIが低減されることが知られている。また、フェライトコアを簡素な構造で基板等に固定する技術が提案されている(例えば、特許文献1及び2参照。)。
【0003】
また一般に、基板に搭載された回路要素の発火時の延焼防止や、EMI低減のため、基板上の回路要素は接地電位の金属板によって覆われる。基板上の回路要素に接続されるケーブルをその金属板に密着させることでそのケーブルに起因するEMIが低減されることが知られている(例えば、特許文献3参照。)。
【0004】
【特許文献1】
特開平11−261276号公報
【特許文献2】
特開2000−309139号公報
【特許文献3】
実開平6−29198号公報
【0005】
【発明が解決しようとする課題】
しかし、特許文献1、2及び3に開示された技術によると、ケーブルをフェライトコアに挿通するとともに接地電位の金属板に密着させ基板上の回路要素を接地電位の金属板で覆うことによりEMIを低減しようとすれば、ケーブル、フェライトコア及び金属板を適切な位置に適切な構成で固定するために部品点数が増大し、組立及び分解の手間が増大する。
【0006】
本発明は、ケーブル周辺のEMIを簡素な構成で低減するEMI低減装置を提供することを目的とする。
【0007】
【課題を解決するための手段】
請求項1に係るEMI低減装置は、基板に搭載されケーブルに電気的に接続される回路要素を覆う姿勢で固定され、鉤孔及び係止部を有する導電性の第一板金部材と、ばね部、前記鉤孔に係止される鉤部、前記ばね部に引っ張られた状態で前記係止部に係止される係合部、及び、前記鉤部と前記係合部との間に形成され前記ケーブルを挟んで前記第一板金部材に対向し前記係合部が前記係止部に係止されると前記ケーブルに圧接する押さえ部を有する導電性の第二板金部材と、前記第一板金部材又は前記第二板金部材のいずれか一方又は両方に拘束され前記ケーブルが挿通されるフェライトコアと、を備えることを特徴とする。
【0008】
請求項1に係るEMI低減装置によると、フェライトコアにケーブルが挿通されることによりケーブルに起因するEMIが低減される。また、第一板金部材及び第二板金部材を接地電位にすれば、第二板金部材のばね部の弾性力により接地電位の第二板金部材の押さえ部及び接地電位の第一板金部材にケーブルが圧接することにより、ケーブルに起因するEMIがさらに低減される。また、請求項1に係るEMI低減装置によると、第一板金部材及び第二板金部材は、フェライトコアを所定の位置に拘束することができ、協働して又は単独でケーブルを狭持することができ、第二板金部材のばね部の弾性力により互いに係止される。したがって、請求項1に係るEMI低減装置によると、ケーブル周辺のEMIを簡素な構成で低減することができる。
【0009】
請求項2に係るEMI低減装置の前記係止部及び前記係合部の一方は孔を有し他方は前記孔に嵌合するボスを有することを特徴とする。
請求項2に係るEMI低減装置によると、鉤穴に鉤部を係止させ孔にボスを嵌合させることにより第一板金部材と第二板金部材が互いに係止されるため、組立及び分解が容易である。
【0010】
請求項3に係るEMI低減装置の前記押さえ部の長手方向縁部は、前記第一板金部材から離間する側に屈曲していることを特徴とする。
請求項3に係るEMI低減装置によると、第二板金部材の縁でケーブルが損傷することを防止できる。
【0011】
請求項4に係るEMI低減装置の前記係合部は、前記第一板金部材から離間する側に屈曲している取っ手部を有することを特徴とする。
請求項4に係るEMI低減装置によると、取っ手部を摘んで第一板金部材に第二板金部材を脱着できるため、組立及び分解が容易である。
【0012】
請求項5に係るEMI低減装置の前記フェライトコアは、前記押さえ部の反ケーブル側に拘束されることを特徴とする。
請求項5に係るEMI低減装置によると、狭い場所にフェライトコアを設置できるため、小型化が可能である。
【0013】
【発明の実施の形態】
以下、本発明の実施の形態を複数の実施例に基づいて説明する。
(第一実施例)
図1は、本発明の第一実施例によるEMI低減装置1を示す斜視図である。EMI低減装置1は、第一板金部材24、第二板金部材38及びフェライトコア52で構成される。
【0014】
第一板金部材24は、金属板のプレス成形により形成されている。第一板金部材24には、耐火性及び導電性が要求されるため、その材質は、アルミ等が望ましい。第一板金部材24は、ねじ72(図4参照)により基板40に締結される。第一板金部材24の天井を構成するシールド部26の広さは、基板40に搭載された図示しないICチップ、配線パターン等の回路要素のほとんどを覆う広さである。
【0015】
第一板金部材24の縁部54は、シールド部26に対してほぼ垂直に曲げられているため、シールド部26と縁部54との間には屈曲部56が形成されている。シールド部26は、基板40に搭載された回路要素から離間した高さにおいて基板40に対して平行な姿勢で縁部54によって支持される。
【0016】
第一板金部材24のシールド部26には、鉤孔30が打ち抜きにより形成されている。鉤孔30は、長手方向軸が屈曲部56の稜線に平行な細長い形状であってシールド部26を貫通している。
【0017】
第一板金部材24の縁部54には、係止部としてのボス42が形成されている。ボス42は、押し出しにより円筒状に形成されている。ボス42及び鉤孔30は、屈曲部56の稜線上の一点からその稜線に垂直な2方向に第一板金部材24の表面上を延びる仮想線上に位置している。
【0018】
第二板金部材38と協働してフェライトコア52を所定位置に拘束するための拘束部16が第一板金部材24のシールド部26から突出している。拘束部16は、打ち抜き及び曲げにより形成され、基端部12が基板40から離間する方向にシールド部26に対してほぼ垂直方向に曲げられ、さらに先端部14が基端部12に対してほぼ垂直方向に曲げられている。先端部14は、シールド部26から離間した高さにおいてシールド部26とほぼ平行な姿勢で基端部12に支持されている。先端部14とシールド部26との間隙にフェライトコア52が拘束される。
【0019】
フェライトコア52は、フレキシブルフラットケーブル(FFC)34のコネクタ36の近傍に設けることが望ましい。FFC34によって伝送される信号の波形を信号の出力源の近傍でなまらせることにより、EMIの低減効果が増大するからである。フェライトコア52は、外形がほぼ直方体の環状に形成されている。フェライトコア52は、FFC34が挿通される細長い断面形状の貫通孔50を有する。フェライトコア52は、貫通孔50の軸線が第一板金部材24のシールド部26と平行になる姿勢でシールド部26に載置されている。
【0020】
第二板金部材38は、金属板のプレス成形により形成されている。第二板金部材38には、導電性及び弾力性が要求されるため、その材質は、ステンレス鋼等が望ましい。第二板金部材38には、ばね部48を間に挟んでL型に配列された押さえ部29及び係合部44が形成されている。押さえ部29の反ばね部側には鉤部60(図2参照)が形成されている。ばね部48、押さえ部29及び鉤部60の配列方向軸と垂直な方向にフェライトコア52を拘束するための拘束部22が押さえ部29から延伸している。以下、第二板金部材38を構成しているこれらの要素について詳細に説明する。
【0021】
図2(A)〜(C)は、第二板金部材38を3方向から見た斜視図である。ここで第二板金部材38を説明するにあたって基準方向を決めておく。押さえ部29の平坦部27の長手方向軸線及び短手方向軸線を含む平面を水平面とし、水平面に対し垂直な方向を上下方向とし、鉤部60が折れ曲がる方向を下向きとする。
【0022】
押さえ部29は、輪郭が長方形の平坦な形状の平坦部27と保護部28とで構成されている。平坦部27は、第二板金部材38が第一板金部材24に組み付けられると、FFC34を間に挟んで第一板金部材24のシールド部26に対向し、シールド部26とともにFFC34を狭持する部位である。平坦部27の長手方向の一方に鉤部60が隣接し、他方にばね部48が隣接する。保護部28は、平坦部27の長手方向縁から上向きに鋭角方向に緩やかに折れ曲がっている。第二板金部材38の組み付け時にFFC34が第二板金部材38の角で損傷することは、保護部28により防止される。
【0023】
鉤部60は、押さえ部29の長手方向の一端から下向きに鋭角方向に緩やかに折り曲げられている。鉤部60は、鉤孔30に挿入可能な形状である。鉤部60を鉤孔30に挿入した状態で鉤部60を押さえ部29側に引き寄せると、鉤部60の内側には第一板金部材24のシールド部26が嵌合する。鉤部60の内側に第一板金部材24のシールド部26が嵌合すると、第二板金部材38の鉤部側端部は、シールド部26に対して垂直な方向の移動を規制される。
【0024】
ばね部48は、第一平坦部68、屈曲部66及び第二平坦部64から構成されている。ばね部48は、屈曲部66で鋭角方向に緩やかに折れ曲がっている。第一平坦部68は押さえ部29に隣接し、押さえ部29から上向きに鈍角方向に折れ曲がっている。第一平坦部68から下向きにほぼ垂直方向に位置決め部62が延伸している。第二平坦部64は係合部44に隣接している。係合部44は、第二平坦部64から鈍角方向に折れ曲がり、下方向に延伸している。押さえ部29の平坦部27の下面を含む第一仮想平面と、係合部44の内面(押さえ部29から近方の面)を含む第二仮想平面とがほぼ垂直に交わるように、各屈曲部の曲げ角度が設定されている。また、第一平坦部68と第二平坦部64の間の屈曲部66が第一仮想平面及び第二仮想平面から離間して位置するように、第一平坦部68と押さえ部29の間の屈曲部69と、第二平坦部64と係合部44の間の屈曲部63との曲げ角度が設定されている。
【0025】
係合部44は、ばね部48の下端から下向きに延伸している。係合部44はボス42が嵌合する孔58が形成された平坦部45と平坦部45から外側(押さえ部29から遠方側)に垂直方向に屈曲した取っ手部46を有する。孔58は、打ち抜きによって円形に形成されている。
【0026】
拘束部22は、斜面部20、天井部18及び側壁部70から構成されている。斜面部20は、押さえ部29の平坦部27の長手方向縁から上方向に鈍角方向に折れ曲がっている。天井部18は、斜面部20の上端縁から鈍角方向に折れ曲がり、水平方向に延伸している。天井部18は、第二板金部材38が第一板金部材24に係止されると、第一板金部材24のシールド部26から離間した高さに水平な姿勢で支持される。天井部18とシールド部26によってフェライトコア52の上下方向の移動が規制される。側壁部70は、天井部18の鉤部60から近方の縁から下方向にほぼ垂直方向に折れ曲がっている。第二板金部材38が第一板金部材24に係止されると、第一板金部材24の拘束部16並びに第二板金部材38の斜面部20及び側壁部70によってフェライトコア52の水平方向の移動が規制される。尚、本実施例では斜面部20と対向してフェライトコア52の水平方向の移動を規制する要素を設けていないが、フェライトコア52の周囲に設けられる部材の構成に応じて適宜設ければよい。また、フェライトコア52に拘束部16及び拘束部22を圧接させてもよいし、圧接させなくてもよい。
【0027】
以上、第一実施例によるEMI低減装置の構成について説明した。次に第一実施例によるEMI低減装置1の使用例について説明する。図3は、EMI低減装置1を備えた画像入出力装置2の内部構造を示す平面図である。図4は、図3の部分拡大図である。
【0028】
画像入出力装置2は、スキャナ及びプリンタとして機能する電子機器である。FFC34は、図示しないイメージセンサの駆動信号及び出力信号を伝送するケーブルである。基板40には、イメージセンサ、プリンタヘッド、用紙搬送機構などを制御する制御回路、イメージセンサの出力信号を処理する画像処理回路などが搭載されている。FFC34のコネクタ36は基板40に搭載された図示しないコネクタに接続されている。
【0029】
第一板金部材24は、基板40に搭載された回路要素を覆う位置にねじ72によって固定される。第一板金部材24は、他の接地電位の金属部材に密着することで接地電位になっている。第一板金部材24により基板40に搭載された回路要素が発火した場合の延焼が防止され、基板40に搭載された回路要素に起因するEMIが低減される。
【0030】
フェライトコア52は、第一板金部材24及び第二板金部材38によってFFC34のコネクタ36の近傍に固定される。FFC34は、図示しないイメージセンサを搭載した基板から延び、フェライトコア52の貫通孔50に挿入される。フェライトコア52にFFC34が挿通されることにより、FFC34に起因するEMIが低減される。FFC34のフェライトコア52に挿入される部分はアルミ箔などの導体で被覆することが望ましい。FFC34の導線を被覆する樹脂被膜をアルミ箔等の導体薄膜で覆い、その導体薄膜を接地電位の第一板金部材24及び第二板金部材38に密着させることにより、FFC34に起因するEMIがさらに低減される。
【0031】
FFC34は、コネクタ36とフェライトコア52との間において第一板金部材24及び第二板金部材38によって狭持される。第一板金部材24に第二板金部材38を組み付ける方法は次の通りである。
【0032】
はじめに、FFC34が挿通されたフェライトコア52を第一板金部材24のシールド部26の上面に載置し、FFC34のコネクタ36を基板40のコネクタに接続する。
【0033】
次に、第一板金部材24のシールド部26に対して第二板金部材38の押さえ部29を傾斜させつつ、第一板金部材24に形成された鉤孔30に第二板金部材38の鉤部60を挿入する。このとき、第一板金部材24の拘束部16と第二板金部材38の拘束部22によってフェライトコア52を囲み、シールド部26と押さえ部29との間にFFC34を挟んでおく。
【0034】
次に、FFC34が押さえ部29及びシールド部26に密着するように、取っ手部46を摘んで係合部44を引っ張り、係合部44の孔58に第一板金部材24のボス42を挿入する。このとき、鉤部60が支点になるため、押さえ部29をシールド部26に密着させようとする力が働く。また、このとき位置決め部62をシールド部26に当接させることにより、孔58とボス42の位置合わせが容易になる。
【0035】
係合部44の孔58に第一板金部材24のボス42が挿入されると、係合部44は、第一板金部材24のばね部48の復原力により、第一板金部材24の縁部54に密着する。また、第一板金部材24のばね部48の復原力により、係合部44の孔58を形成している内周壁がボス42の外周壁と圧接する。したがって、係合部44の孔58に第一板金部材24のボス42を挿入すると、それ以後は、係合部44を縁部54から離間させる方向に引っ張る外力が作用しない限り、第二板金部材38から第一板金部材24が脱落することはない。また、鉤部60及び係合部44が第一板金部材24に密着することになるため第二板金部材38は接地電位になる。尚、第二板金部材38を第一板金部材24から取り外すときには、係合部44を縁部54から離間させる方向に取っ手部46を引っ張ればよい。
【0036】
以上述べた方法により第一板金部材24に第二板金部材38が組み付けられると、第一板金部材24の拘束部16と第二板金部材38の拘束部22によってフェライトコア52がFFC34のコネクタ36の近傍に固定され、FFC34のコネクタ36に近い部分が第一板金部材24と第二板金部材38によって位置決めされる。また、FFC34は、接地電位の第一板金部材24と接地電位の第二板金部材38に密着する。
【0037】
(第二実施例)
図5は、本発明の第二実施例によるEMI低減装置の第二板金部材80及びフェライトコア52を示す斜視図である。第一実施例と同一の構成部分については同一符号を付して説明を省略する。
【0038】
第二板金部材80には、天井部18と斜面部20と3つの側壁部70、74、76とを有する拘束部78が形成されている。側壁部70、74は、フェライトコア52を挟んで互いに対向している。側壁部76は、フェライトコア52を挟んで斜面部20と対向している。第二実施例によるEMI低減装置によると、第二板金部材80の拘束部78に形成された斜面部20と3つの側壁部70、74、76とによって第一板金部材24のシールド部26に沿った方向についてフェライトコア52の移動を規制することができ、拘束部78の天井部18によってシールド部26に垂直な方向についてフェライトコア52の移動を規制できるため、第一板金部材24にフェライトコア52を拘束する部位を形成する必要がない。
【0039】
(第三実施例)
図6は、本発明の第三実施例によるEMI低減装置の第二板金部材94及びフェライトコア52を示す斜視図である。第一実施例と同一の構成部分については同一符号を付して説明を省略する。
【0040】
押さえ部90は、平坦部86と保護部88、84で構成されている。保護部88、84は、平坦部86の長手方向の両側縁から上向きに(基準方向は第一実施例に準ずるものとする。)ほぼ垂直方向に折れ曲がっている。保護部88、84の高さは、フェライトコア52の環状部の厚さ、すなわち平坦部86から貫通孔50までの高さより低く設定される。これにより保護部88、84の先端とFFC34との接触を防止できる。
【0041】
拘束部82、92は、押さえ部90の平坦部86から上向きにほぼ垂直方向に折れ曲がり、先端部が互いに接近するように湾曲している。拘束部82の上部と拘束部92の上部との間隔はフェライトコア52の長手方向軸の長さより小さい。このため、フェライトコア52は、拘束部82、92の弾性力によって拘束部82、92及び押さえ部90の平坦部86に狭持され、押さえ部90の上面に位置決めされる。このため、狭い場所にフェライトコア52を設置することができる。
【0042】
FFC34は、保護部88で折り返され、折り返し部位を挟んで一方がフェライトコア52に挿通され、他方が押さえ部90とシールド部26とで狭持される。
【0043】
以上説明した本発明の複数の実施例によると、フェライトコアにFFCが挿通されることによりFFCに起因するEMIが低減される。また、本発明の複数の実施例によると、第二板金部材のばね部の弾性力により接地電位の第二板金部材の押さえ部及び接地電位の第一板金部材にケーブルが圧接することにより、ケーブルに起因するEMIがさらに低減される。
【0044】
また、本発明の複数の実施例によると、第一板金部材及び第二板金部材は、フェライトコアを所定の位置に拘束することができ、協働して又は単独でケーブルを狭持することができ、第二板金部材のばね部の弾性力により互いに係止される。このため、本発明の複数の実施例によると、第一板金部材、第二板金部材及びフェライトコアという3つの部品からなる簡素な構成のEMI低減装置を実現することができる。
【0045】
尚、上述の実施例では、第一板金部材と第二板金部材をボスと孔の嵌合によって互いに係止する構成を説明したが、例えば折り返しにより形成される鉤部と打ち抜きにより形成される孔の係合によって第一板金部材と第二板金部材が互いに係止される構成にしてもよいし、両部材に形成した孔にピンなどを挿通する構成にしてもよい。
【0046】
また、上述の実施例では、EMI低減装置の使用例として画像入出力装置に組み込む例を示したが、高周波信号を電送するケーブルを備える電子機器であれば、どのような電子機器に組み込んでもよく、ケーブルの種類もFFCに限定されない。
【図面の簡単な説明】
【図1】本発明の第一実施例によるEMI低減装置を示す斜視図である。
【図2】本発明の第一実施例に係る第二板金部材を示す斜視図である。
【図3】本発明の第一実施例によるEMI低減装置を備えた画像入出力装置の内部構造を示す平面図である。
【図4】図3の部分拡大図である。
【図5】本発明の第二実施例に係る第二板金部材及びフェライトコアを示す斜視図である。
【図6】本発明の第三実施例に係る第二板金部材及びフェライトコアを示す斜視図である。
【符号の説明】
1  EMI低減装置
22、78、82、92  拘束部
24  第一板金部材
29、90  押さえ部
30  鉤孔
34  FFC(フレキシブルフラットケーブル)
38、80、94  第二板金部材
38  第二板金部材
40  基板
42  ボス
44  係合部
46  取っ手部
48  ばね部
52  フェライトコア
58  孔
60  鉤部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in EMC (Electromagnetic Compatibility) of an electronic device, and more particularly to an EMI reduction device that reduces EMI (Electromagnetic Interference) around a cable with a ferrite core or the like.
[0002]
[Prior art]
Conventionally, it is known that EMI caused by the cable is reduced by inserting the cable through the ferrite core. Further, a technique for fixing a ferrite core to a substrate or the like with a simple structure has been proposed (for example, see Patent Documents 1 and 2).
[0003]
In general, the circuit elements on the board are covered with a metal plate at the ground potential to prevent the spread of fire when the circuit elements mounted on the board are ignited and to reduce EMI. It is known that EMI caused by a cable connected to a circuit element on a substrate is reduced by bringing the cable into close contact with the metal plate (for example, see Patent Document 3).
[0004]
[Patent Document 1]
JP-A-11-261276 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-309139 [Patent Document 3]
JP-A-6-29198 [0005]
[Problems to be solved by the invention]
However, according to the techniques disclosed in Patent Documents 1, 2, and 3, EMI is reduced by inserting a cable into a ferrite core and adhering the cable to a ground potential metal plate to cover circuit elements on the board with the ground potential metal plate. In order to reduce the number of components, the number of parts increases in order to fix the cable, the ferrite core, and the metal plate in an appropriate position and in an appropriate configuration, and the labor for assembling and disassembling increases.
[0006]
An object of the present invention is to provide an EMI reduction device that reduces EMI around a cable with a simple configuration.
[0007]
[Means for Solving the Problems]
The EMI reduction device according to claim 1, wherein the conductive first sheet metal member having a hook hole and a locking portion is fixed in a posture covering a circuit element mounted on the substrate and electrically connected to the cable, and a spring portion. A hook portion locked by the hook hole, an engaging portion locked by the locking portion while being pulled by the spring portion, and a hook portion formed between the hook portion and the engaging portion. A conductive second sheet metal member having a holding portion that faces the first sheet metal member with the cable interposed therebetween and presses against the cable when the engaging portion is locked by the locking portion; and the first sheet metal. A ferrite core that is restricted by one or both of the member and the second sheet metal member and through which the cable is inserted.
[0008]
According to the EMI reduction device of the first aspect, the EMI caused by the cable is reduced by inserting the cable into the ferrite core. Also, if the first sheet metal member and the second sheet metal member are set to the ground potential, the elastic force of the spring portion of the second sheet metal member causes the cable to be connected to the holding portion of the second sheet metal member at the ground potential and the first sheet metal member at the ground potential. The pressure contact further reduces EMI due to the cable. According to the EMI reduction device of the first aspect, the first sheet metal member and the second sheet metal member can restrain the ferrite core at a predetermined position, and can cooperate or independently hold the cable. Are locked together by the elastic force of the spring portion of the second sheet metal member. Therefore, according to the EMI reduction device of the first aspect, EMI around the cable can be reduced with a simple configuration.
[0009]
One of the locking portion and the engaging portion of the EMI reduction device according to claim 2 has a hole, and the other has a boss fitted into the hole.
According to the EMI reduction device according to claim 2, the first sheet metal member and the second sheet metal member are locked to each other by locking the hook portion in the hook hole and fitting the boss in the hole, so that assembly and disassembly are performed. Easy.
[0010]
A longitudinal edge of the holding portion of the EMI reduction device according to claim 3 is bent to a side away from the first sheet metal member.
According to the EMI reduction device of the third aspect, it is possible to prevent the cable from being damaged at the edge of the second sheet metal member.
[0011]
The engaging portion of the EMI reduction device according to claim 4 has a handle portion bent to a side away from the first sheet metal member.
According to the EMI reduction device of the fourth aspect, since the second sheet metal member can be attached to and detached from the first sheet metal member by gripping the handle portion, assembly and disassembly are easy.
[0012]
The ferrite core of the EMI reduction device according to claim 5 is characterized in that the ferrite core is restrained on a side of the holding portion opposite to the cable.
According to the EMI reduction device according to the fifth aspect, the ferrite core can be installed in a narrow place, so that the size can be reduced.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on a plurality of examples.
(First embodiment)
FIG. 1 is a perspective view showing an EMI reduction device 1 according to a first embodiment of the present invention. The EMI reduction device 1 includes the first sheet metal member 24, the second sheet metal member 38, and the ferrite core 52.
[0014]
The first sheet metal member 24 is formed by pressing a metal plate. Since the first sheet metal member 24 is required to have fire resistance and conductivity, the material is preferably aluminum or the like. The first sheet metal member 24 is fastened to the substrate 40 by screws 72 (see FIG. 4). The width of the shield part 26 constituting the ceiling of the first sheet metal member 24 is large enough to cover most of circuit elements such as IC chips and wiring patterns (not shown) mounted on the substrate 40.
[0015]
Since the edge portion 54 of the first sheet metal member 24 is bent substantially perpendicularly to the shield portion 26, a bent portion 56 is formed between the shield portion 26 and the edge portion 54. The shield part 26 is supported by the edge part 54 in a posture parallel to the substrate 40 at a height separated from the circuit element mounted on the substrate 40.
[0016]
In the shield part 26 of the first sheet metal member 24, a hook hole 30 is formed by punching. The hook hole 30 has an elongated shape whose longitudinal axis is parallel to the ridge line of the bent portion 56 and penetrates through the shield portion 26.
[0017]
The boss 42 as an engaging portion is formed on the edge 54 of the first sheet metal member 24. The boss 42 is formed in a cylindrical shape by extrusion. The boss 42 and the hook hole 30 are located on an imaginary line extending on the surface of the first sheet metal member 24 from one point on the ridge line of the bent portion 56 in two directions perpendicular to the ridge line.
[0018]
The restraining portion 16 for restraining the ferrite core 52 at a predetermined position in cooperation with the second sheet metal member 38 projects from the shield part 26 of the first sheet metal member 24. The constraining portion 16 is formed by punching and bending, and the base end portion 12 is bent substantially perpendicularly to the shield portion 26 in a direction away from the substrate 40, and further, the distal end portion 14 is substantially bent with respect to the base end portion 12. It is bent vertically. The distal end portion 14 is supported by the base end portion 12 in a posture substantially parallel to the shield portion 26 at a height separated from the shield portion 26. The ferrite core 52 is restrained in the gap between the tip portion 14 and the shield portion 26.
[0019]
The ferrite core 52 is desirably provided near the connector 36 of the flexible flat cable (FFC) 34. This is because the effect of reducing the EMI is increased by blunting the waveform of the signal transmitted by the FFC 34 near the signal output source. The ferrite core 52 is formed in a substantially rectangular parallelepiped annular shape. The ferrite core 52 has a through-hole 50 having an elongated cross-sectional shape into which the FFC 34 is inserted. The ferrite core 52 is placed on the shield part 26 such that the axis of the through hole 50 is parallel to the shield part 26 of the first sheet metal member 24.
[0020]
The second sheet metal member 38 is formed by pressing a metal plate. Since the second sheet metal member 38 is required to have conductivity and elasticity, the material is preferably stainless steel or the like. The second sheet metal member 38 is formed with the pressing portions 29 and the engaging portions 44 arranged in an L shape with the spring portion 48 interposed therebetween. A hook portion 60 (see FIG. 2) is formed on the side of the pressing portion 29 opposite to the spring portion. The restraining portion 22 for restraining the ferrite core 52 in a direction perpendicular to the arrangement direction of the spring portion 48, the pressing portion 29, and the hook portion 60 extends from the pressing portion 29. Hereinafter, these elements constituting the second sheet metal member 38 will be described in detail.
[0021]
2A to 2C are perspective views of the second sheet metal member 38 viewed from three directions. Here, when describing the second sheet metal member 38, a reference direction is determined. A plane including the longitudinal axis and the transverse axis of the flat part 27 of the holding part 29 is defined as a horizontal plane, a direction perpendicular to the horizontal plane is defined as a vertical direction, and a direction in which the hook 60 is bent is defined as a downward direction.
[0022]
The holding portion 29 includes a flat portion 27 having a flat rectangular shape and a protection portion 28. When the second sheet metal member 38 is assembled to the first sheet metal member 24, the flat part 27 faces the shield part 26 of the first sheet metal member 24 with the FFC 34 interposed therebetween, and holds the FFC 34 together with the shield part 26. It is. The hook portion 60 is adjacent to one of the flat portions 27 in the longitudinal direction, and the spring portion 48 is adjacent to the other. The protection portion 28 is gently bent upward from the longitudinal edge of the flat portion 27 in an acute angle direction. The protection section 28 prevents the FFC 34 from being damaged at the corner of the second sheet metal member 38 when the second sheet metal member 38 is assembled.
[0023]
The hook portion 60 is gently bent downward from an end in the longitudinal direction of the pressing portion 29 in an acute angle direction. The hook portion 60 has a shape that can be inserted into the hook hole 30. When the hook portion 60 is pulled toward the holding portion 29 with the hook portion 60 inserted into the hook hole 30, the shield portion 26 of the first sheet metal member 24 fits inside the hook portion 60. When the shield part 26 of the first sheet metal member 24 fits inside the hook part 60, the end of the second sheet metal member 38 on the hook part side is restricted from moving in the direction perpendicular to the shield part 26.
[0024]
The spring portion 48 includes a first flat portion 68, a bent portion 66, and a second flat portion 64. The spring portion 48 is gently bent at the bent portion 66 in the acute angle direction. The first flat portion 68 is adjacent to the pressing portion 29 and is bent upward from the pressing portion 29 in an obtuse angle direction. The positioning portion 62 extends downward from the first flat portion 68 in a substantially vertical direction. The second flat portion 64 is adjacent to the engaging portion 44. The engagement portion 44 is bent from the second flat portion 64 in an obtuse angle direction and extends downward. Each bending is performed so that the first virtual plane including the lower surface of the flat portion 27 of the pressing portion 29 and the second virtual plane including the inner surface of the engaging portion 44 (the surface close to the pressing portion 29) intersect substantially perpendicularly. The bending angle of the part is set. Also, the first flat portion 68 and the pressing portion 29 are located such that the bent portion 66 between the first flat portion 68 and the second flat portion 64 is located away from the first virtual plane and the second virtual plane. The bending angle between the bending portion 69 and the bending portion 63 between the second flat portion 64 and the engaging portion 44 is set.
[0025]
The engagement portion 44 extends downward from the lower end of the spring portion 48. The engaging portion 44 has a flat portion 45 in which a hole 58 in which the boss 42 is fitted is formed, and a handle portion 46 which is bent vertically outward from the flat portion 45 (far from the pressing portion 29). The hole 58 is formed in a circular shape by punching.
[0026]
The constraining portion 22 includes a slope portion 20, a ceiling portion 18, and a side wall portion 70. The slope portion 20 is bent upward at an obtuse angle from the longitudinal edge of the flat portion 27 of the pressing portion 29. The ceiling portion 18 is bent in an obtuse angle direction from the upper edge of the slope portion 20 and extends in the horizontal direction. When the second sheet metal member 38 is locked to the first sheet metal member 24, the ceiling 18 is supported in a horizontal posture at a height away from the shield part 26 of the first sheet metal member 24. The vertical movement of the ferrite core 52 is restricted by the ceiling 18 and the shield 26. The side wall 70 is bent substantially vertically downward from an edge near the hook 60 of the ceiling 18. When the second sheet metal member 38 is locked to the first sheet metal member 24, the horizontal movement of the ferrite core 52 by the restraining portion 16 of the first sheet metal member 24 and the slope 20 and the side wall 70 of the second sheet metal member 38. Is regulated. In the present embodiment, no element is provided to restrict the horizontal movement of the ferrite core 52 in opposition to the inclined surface portion 20. However, the element may be appropriately provided according to the configuration of members provided around the ferrite core 52. . Further, the constrained portions 16 and 22 may or may not be pressed against the ferrite core 52.
[0027]
The configuration of the EMI reduction device according to the first embodiment has been described above. Next, an example of use of the EMI reduction device 1 according to the first embodiment will be described. FIG. 3 is a plan view showing the internal structure of the image input / output device 2 including the EMI reduction device 1. FIG. 4 is a partially enlarged view of FIG.
[0028]
The image input / output device 2 is an electronic device that functions as a scanner and a printer. The FFC 34 is a cable that transmits a drive signal and an output signal of an image sensor (not shown). On the substrate 40, a control circuit for controlling an image sensor, a printer head, a paper transport mechanism, and the like, an image processing circuit for processing an output signal of the image sensor, and the like are mounted. The connector 36 of the FFC 34 is connected to a connector (not shown) mounted on the board 40.
[0029]
The first sheet metal member 24 is fixed by a screw 72 at a position covering the circuit element mounted on the substrate 40. The first sheet metal member 24 is set to the ground potential by being in close contact with another metal member having the ground potential. The first sheet metal member 24 prevents the spread of fire when the circuit element mounted on the substrate 40 ignites, and reduces EMI caused by the circuit element mounted on the substrate 40.
[0030]
The ferrite core 52 is fixed near the connector 36 of the FFC 34 by the first sheet metal member 24 and the second sheet metal member 38. The FFC 34 extends from a substrate on which an image sensor (not shown) is mounted, and is inserted into the through hole 50 of the ferrite core 52. By inserting the FFC 34 through the ferrite core 52, EMI caused by the FFC 34 is reduced. The portion of the FFC 34 inserted into the ferrite core 52 is desirably covered with a conductor such as aluminum foil. The EMI caused by the FFC 34 is further reduced by covering the resin film covering the conductor of the FFC 34 with a conductive thin film such as an aluminum foil and bringing the conductive thin film into close contact with the first sheet metal member 24 and the second sheet metal member 38 at the ground potential. Is done.
[0031]
The FFC 34 is sandwiched between the connector 36 and the ferrite core 52 by the first sheet metal member 24 and the second sheet metal member 38. The method of assembling the second sheet metal member 38 to the first sheet metal member 24 is as follows.
[0032]
First, the ferrite core 52 into which the FFC 34 has been inserted is placed on the upper surface of the shield part 26 of the first sheet metal member 24, and the connector 36 of the FFC 34 is connected to the connector of the board 40.
[0033]
Next, while the holding part 29 of the second sheet metal member 38 is inclined with respect to the shield part 26 of the first sheet metal member 24, the hook part 30 of the second sheet metal member 38 is inserted into the hook hole 30 formed in the first sheet metal member 24. Insert 60. At this time, the ferrite core 52 is surrounded by the restraining portion 16 of the first sheet metal member 24 and the restraining portion 22 of the second sheet metal member 38, and the FFC 34 is sandwiched between the shield portion 26 and the pressing portion 29.
[0034]
Next, the handle portion 46 is pinched and the engaging portion 44 is pulled so that the FFC 34 is in close contact with the pressing portion 29 and the shield portion 26, and the boss 42 of the first sheet metal member 24 is inserted into the hole 58 of the engaging portion 44. . At this time, since the hook 60 serves as a fulcrum, a force is exerted to bring the holding portion 29 into close contact with the shield portion 26. At this time, the positioning of the hole 58 and the boss 42 is facilitated by bringing the positioning part 62 into contact with the shield part 26.
[0035]
When the boss 42 of the first sheet metal member 24 is inserted into the hole 58 of the engaging part 44, the engaging part 44 is moved to the edge of the first sheet metal member 24 by the restoring force of the spring 48 of the first sheet metal member 24. Adhere to 54. Also, the inner peripheral wall forming the hole 58 of the engaging portion 44 comes into pressure contact with the outer peripheral wall of the boss 42 by the restoring force of the spring portion 48 of the first sheet metal member 24. Therefore, when the boss 42 of the first sheet metal member 24 is inserted into the hole 58 of the engaging portion 44, thereafter, unless an external force that pulls the engaging portion 44 away from the edge 54 acts, the second sheet metal member The first sheet metal member 24 does not fall off from 38. Further, since the hook 60 and the engaging portion 44 come into close contact with the first sheet metal member 24, the second sheet metal member 38 is at the ground potential. When the second sheet metal member 38 is detached from the first sheet metal member 24, the handle portion 46 may be pulled in a direction to separate the engaging portion 44 from the edge portion 54.
[0036]
When the second sheet metal member 38 is assembled to the first sheet metal member 24 by the method described above, the ferrite core 52 is connected to the connector 36 of the FFC 34 by the restraining portion 16 of the first sheet metal member 24 and the restraining portion 22 of the second sheet metal member 38. A portion near the connector 36 of the FFC 34 is fixed in the vicinity, and is positioned by the first sheet metal member 24 and the second sheet metal member 38. The FFC 34 is in close contact with the first sheet metal member 24 at the ground potential and the second sheet metal member 38 at the ground potential.
[0037]
(Second embodiment)
FIG. 5 is a perspective view showing the second sheet metal member 80 and the ferrite core 52 of the EMI reduction device according to the second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0038]
The second sheet metal member 80 is formed with a restraining portion 78 having a ceiling 18, a slope 20, and three side walls 70, 74, 76. The side wall portions 70 and 74 face each other with the ferrite core 52 interposed therebetween. The side wall 76 faces the slope 20 with the ferrite core 52 interposed therebetween. According to the EMI reduction device according to the second embodiment, the inclined portion 20 formed on the restraining portion 78 of the second sheet metal member 80 and the three side walls 70, 74, 76 are arranged along the shield portion 26 of the first sheet metal member 24. The movement of the ferrite core 52 in the direction perpendicular to the shield part 26 can be restricted by the ceiling 18 of the restraining part 78 in the direction in which the ferrite core 52 moves. There is no need to form a part that restrains
[0039]
(Third embodiment)
FIG. 6 is a perspective view showing the second sheet metal member 94 and the ferrite core 52 of the EMI reduction device according to the third embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0040]
The holding section 90 is composed of a flat section 86 and protection sections 88 and 84. The protective portions 88 and 84 are bent substantially vertically upward from both side edges in the longitudinal direction of the flat portion 86 (the reference direction is based on the first embodiment). The height of the protection portions 88 and 84 is set lower than the thickness of the annular portion of the ferrite core 52, that is, the height from the flat portion 86 to the through hole 50. Thereby, contact between the tips of the protection portions 88 and 84 and the FFC 34 can be prevented.
[0041]
The restraining portions 82 and 92 are bent upward in a substantially vertical direction from the flat portion 86 of the pressing portion 90, and are curved such that their tips approach each other. The distance between the upper portion of the constraint portion 82 and the upper portion of the constraint portion 92 is smaller than the length of the longitudinal axis of the ferrite core 52. Therefore, the ferrite core 52 is held between the restraining portions 82 and 92 and the flat portion 86 of the pressing portion 90 by the elastic force of the restraining portions 82 and 92, and is positioned on the upper surface of the pressing portion 90. For this reason, the ferrite core 52 can be installed in a narrow place.
[0042]
The FFC 34 is folded back by the protection portion 88, one of which is inserted into the ferrite core 52 with the folded portion interposed therebetween, and the other is sandwiched between the holding portion 90 and the shield portion 26.
[0043]
According to the plurality of embodiments of the present invention described above, the EMI caused by the FFC is reduced by inserting the FFC into the ferrite core. According to a plurality of embodiments of the present invention, the cable is pressed against the holding portion of the second sheet metal member at the ground potential and the first sheet metal member at the ground potential by the elastic force of the spring portion of the second sheet metal member. Is further reduced.
[0044]
Further, according to a plurality of embodiments of the present invention, the first sheet metal member and the second sheet metal member can restrain the ferrite core in a predetermined position, and can cooperate or independently clamp the cable. Then, they are locked to each other by the elastic force of the spring portion of the second sheet metal member. For this reason, according to the plurality of embodiments of the present invention, it is possible to realize an EMI reduction device having a simple configuration including three parts, that is, the first sheet metal member, the second sheet metal member, and the ferrite core.
[0045]
In the above-described embodiment, the structure in which the first sheet metal member and the second sheet metal member are locked to each other by fitting the boss and the hole has been described. However, for example, a hook formed by folding and a hole formed by punching The first sheet metal member and the second sheet metal member may be locked to each other by the engagement, or a pin may be inserted into holes formed in both members.
[0046]
In the above-described embodiment, an example in which the EMI reduction device is incorporated in an image input / output device is described. However, any electronic device including a cable for transmitting a high-frequency signal may be incorporated in any electronic device. Also, the type of cable is not limited to FFC.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an EMI reduction device according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a second sheet metal member according to the first embodiment of the present invention.
FIG. 3 is a plan view showing the internal structure of the image input / output device including the EMI reduction device according to the first embodiment of the present invention.
FIG. 4 is a partially enlarged view of FIG. 3;
FIG. 5 is a perspective view showing a second sheet metal member and a ferrite core according to a second embodiment of the present invention.
FIG. 6 is a perspective view showing a second sheet metal member and a ferrite core according to a third embodiment of the present invention.
[Explanation of symbols]
1 EMI reduction device 22, 78, 82, 92 Restraining part 24 First sheet metal member 29, 90 Pressing part 30 Hook 34 FFC (flexible flat cable)
38, 80, 94 Second sheet metal member 38 Second sheet metal member 40 Substrate 42 Boss 44 Engagement part 46 Handle part 48 Spring part 52 Ferrite core 58 Hole 60 Hook part

Claims (5)

基板に搭載されケーブルに電気的に接続される回路要素を覆う姿勢で固定され、鉤孔及び係止部を有する導電性の第一板金部材と、
ばね部、前記鉤孔に係止される鉤部、前記ばね部に引っ張られた状態で前記係止部に係止される係合部、及び、前記鉤部と前記係合部との間に形成され前記ケーブルを挟んで前記第一板金部材に対向し前記係合部が前記係止部に係止されると前記ケーブルに圧接する押さえ部を有する導電性の第二板金部材と、
前記第一板金部材又は前記第二板金部材のいずれか一方又は両方に拘束され前記ケーブルが挿通されるフェライトコアと、
を備えることを特徴とするEMI低減装置。
A conductive first sheet metal member having a hook hole and a locking portion, which is fixed in a posture covering a circuit element mounted on the substrate and electrically connected to the cable,
A spring portion, a hook portion locked by the hook hole, an engaging portion locked by the locking portion in a state of being pulled by the spring portion, and between the hook portion and the engaging portion. A conductive second sheet metal member having a holding portion formed and opposed to the first sheet metal member with the cable interposed therebetween and having a pressing portion pressed against the cable when the engaging portion is locked by the locking portion;
A ferrite core through which the cable is inserted, which is constrained by one or both of the first sheet metal member and the second sheet metal member,
An EMI reduction device, comprising:
前記係止部及び前記係合部の一方は孔を有し他方は前記孔に嵌合するボスを有することを特徴とする請求項1に記載のEMI低減装置。The EMI reduction device according to claim 1, wherein one of the locking portion and the engaging portion has a hole, and the other has a boss fitted into the hole. 前記押さえ部の長手方向縁部は、前記第一板金部材から離間する側に屈曲していることを特徴とする請求項1又は2に記載のEMI低減装置。3. The EMI reduction device according to claim 1, wherein a longitudinal edge of the pressing portion is bent to a side separated from the first sheet metal member. 4. 前記係合部は、前記第一板金部材から離間する側に屈曲している取っ手部を有することを特徴とする請求項1、2又は3に記載のEMI低減装置。4. The EMI reduction device according to claim 1, wherein the engagement portion has a handle portion bent to a side away from the first sheet metal member. 5. 前記フェライトコアは、前記押さえ部の反ケーブル側に拘束されることを特徴とする請求項1〜4のいずれか一項に記載のEMI低減装置。The EMI reduction device according to any one of claims 1 to 4, wherein the ferrite core is restrained on a side of the pressing portion opposite to the cable.
JP2002262386A 2002-09-09 2002-09-09 Emi reducing device Withdrawn JP2004103757A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019159648A1 (en) * 2018-02-13 2019-08-22 株式会社オートネットワーク技術研究所 Inductor, boarded inductor, and electrical connection box

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019159648A1 (en) * 2018-02-13 2019-08-22 株式会社オートネットワーク技術研究所 Inductor, boarded inductor, and electrical connection box
JP2019140264A (en) * 2018-02-13 2019-08-22 株式会社オートネットワーク技術研究所 Inductor, inductor with substrate, and electrical connection box
CN111656468A (en) * 2018-02-13 2020-09-11 株式会社自动网络技术研究所 Inductor, inductor with substrate and electric connection box
CN111656468B (en) * 2018-02-13 2023-10-31 株式会社自动网络技术研究所 Inductor, inductor with substrate and electric connection box
US11908610B2 (en) 2018-02-13 2024-02-20 Autonetworks Technologies, Ltd. Inductor, inductor with circuit board, and electrical junction box

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