JP5010990B2 - 接続方法 - Google Patents
接続方法 Download PDFInfo
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- JP5010990B2 JP5010990B2 JP2007150180A JP2007150180A JP5010990B2 JP 5010990 B2 JP5010990 B2 JP 5010990B2 JP 2007150180 A JP2007150180 A JP 2007150180A JP 2007150180 A JP2007150180 A JP 2007150180A JP 5010990 B2 JP5010990 B2 JP 5010990B2
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- H—ELECTRICITY
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- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
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Description
しかし、近年、電気部品の端子の狭ピッチ化が進んでおり、電気部品を接続する際に、導電性粒子が隣接する端子間で凝集して、端子間が短絡することがある。
絶縁被膜を施した粒子は、凝集が発生した際にその絶縁被膜を破壊するだけの外部応力が加わると短絡が起こるという問題点がある。
また粒子密度を減らして粒子凝集を抑える方法は端子間の粒子補足が不足し、導通不良になってしまう問題を抱えていた。
しかし、絶縁性粒子の粒径が大きいと、導電性粒子が電気部品の端子に挟みこまれる前に、絶縁性粒子が挟み込まれる。絶縁性粒子が先に挟み込まれると、導電性粒子が端子に接触しないか、接触しても導電性粒子にかかる押圧力が小さくなり、変形量が小さくなるため、端子間に導通不良が生じる虞ある。
導電性粒子と端子との接触面積を増やすために、導電性粒子が変形するように押圧する場合には、絶縁性粒子が挟み込まれる確率が高くなるため、この問題は特に深刻であった。
ボイドが発生すると、電気部品の接続強度が低くなり、長時間放置した場合には、電気部品が異方導電性接着剤から浮き上がり、導通不良が生じることがある。
本発明は接続方法であって、前記絶縁性粒子の合計体積が、前記導電性粒子の合計体積の0.2倍以上2倍以下になるよう混合して、前記異方導電性接着剤を作成する接続方法である。
本発明は接続方法であって、前記分散溶剤に膨潤しない前記絶縁性粒子を混合して、前記異方導電性接着剤を作成する接続方法である。
本発明は接続方法であって、前記絶縁性粒子は、無機粒子の表面に官能モノマーが結合した有機無機ハイブリッド粒子であり、前記接着剤樹脂は、前記有機無機ハイブリッド粒子の前記官能モノマーと重合可能な重合樹脂を含有する接続方法である。
本発明は接続方法であって、前記絶縁性粒子は、有機粒子の表面に無機材料が結合した有機無機ハイブリッド粒子である接続方法である。
本発明は接続方法であって、前記絶縁性粒子は、有機ポリマー骨格中に少なくとも1個の無機材料骨格が化学結合された無機含有樹脂で構成された接続方法である。
本発明は、前記基板と、前記電気部品と、前記異方導電性接着剤とを有し、前記基板と前記電気部品とが機械的に接続された接合体であって、前記基板側端子と前記部品側端子は、上記いずれかの接続方法によって電気的に接続された接合体である。
尚、導電性粒子が破壊された状態とは、押圧力を取り除いても導電性粒子の粒径が元に戻らず、回復特性を失った状態であり、例えば、導電性粒子が樹脂粒子表面に金属被膜が形成された金属被膜樹脂粒子の場合、樹脂粒子自体の破壊されてしまう状態を示す。
予備試験では、先ず、基板と電気部品の接続に用いる異方導電性接着剤と、同じ異方導電性接着剤からなり、同じ膜厚、同じ面積の試験片を、表面が平坦な2枚の試験板に挟んで、基板と電気部品を接続する時と同じ温度で押圧して、押圧力と試験板の間の距離から、押圧力と導電性粒子の粒径との関係を求めておく。
予め、絶縁性粒子の粒径を求めておくと、絶縁性粒子の粒径と破壊粒径のどちらが大きいかが分かるから、導電性粒子を破壊せず、かつ、導電性粒子が絶縁性粒子よりも大きい範囲で変形させて、導電性粒子の捕捉数を正確に計測するためには、破壊押圧力と、変形押圧力のどちらを上限値にすればよいかが分かる。
分散溶剤と、分散溶剤に溶解する接着剤樹脂と、導電性粒子と、粒径が導電性粒子よりも小さい絶縁性粒子とを混合し、異方導電性接着剤を作成する。
フィルム化の一例を説明すると、混合溶剤(分散溶剤)を含有するペースト状の異方導電性接着剤10を、バーコーター等の塗布手段で、剥離フィルムの表面に塗布し、所定膜厚の塗布層を形成した後、該塗布層を加熱して余分な混合溶剤を除去すれば、フィルム状の異方導電性接着剤(接着フィルム)が得られる。
上述したように、本発明に用いる絶縁性粒子12は分散溶剤に膨潤しないので、塗布時に筋が発生せず、接着フィルムの膜厚も均一になる。
異方導電性接着剤10に含まれる導電性粒子15は、表面に導電性物質が露出し、押圧により変形可能な粒子である。
例えば導電性粒子15は、樹脂粒子16の表面に金属被膜17が形成された金属被膜樹脂粒子、又は、金属粒子であって、金属被膜樹脂粒子は押圧により弾性変形し、金属粒子は押圧により塑性変形する。
絶縁性粒子12の粒径は予め分かっており、絶縁性粒子12の粒径と破壊粒径とを比較する。絶縁性粒子12の粒径が破壊粒径未満の場合には、押圧力と導電性粒子15の粒径との関係から、導電性粒子15の粒径が、破壊粒径に到達するときの押圧力(破壊押圧力)を求め、破壊押圧力を上限値に設定する。
設定された上限値未満の範囲で、導電性粒子15が変形する程度の押圧力を設定しておく。
図2(a)の符号20は基板を示している。基板20は、板状の基板本体21と、基板本体21の表面に配置された基板側端子25とを有している。基板側端子25は基板本体21の表面縁部分で露出しており、その表面縁部分に、ペースト状の異方導電性接着剤10を塗布するか、フィルム状の異方導電性接着剤10を貼付し、基板側端子25の露出部分を異方導電性接着剤10で覆う(仮貼り)。
上述したように、絶縁性粒子12は分散溶剤を吸収しないので、加熱の際に、バインダー11中にボイドが発生しない。基板20と電気部品30は、又は固化したバインダー11によって機械的に強固に接続される。
基板本体21はガラス基板やプラスチック基板等の透明基板で構成されている。
トルエン/酢酸エチル=1/1(重量比)の分散溶剤に、熱可塑性樹脂であるフェノキシ樹脂を溶解させ、フェノキシ樹脂30重量%の溶解品を得た。
次に、フェノキシ樹脂に対する配合量が、下記表1になるよう、硬化剤と、熱硬化性樹脂であるエポキシ樹脂と、カップリング剤と、絶縁性粒子と、導電性粒子とを溶解品に加え、固形分(フェノキシ樹脂と、硬化剤と、エポキシ樹脂と、カップリング剤と、絶縁性粒子と、導電性粒子の合計量)が40重量%になるよう、トルエンで調整し、6種類の接続材料の溶解品を得た。
導電性粒子15は、積水化学工業(株)社製の商品名「AUL704」であり、これは、アクリル樹脂粒子の表面にNi/Auメッキ被膜が形成された金属被膜樹脂粒子である(平均粒径4μm)。
評価試験用の基板20として、ガラス基板の表面に、アルミニウム端子が形成されたアルミパターンガラス(表面抵抗10Ω/□、ガラス厚0.7mm)を用い、電気部品として38μm厚の基材フィルム表面にSnメッキされた銅端子が形成されたCOFデバイスとを用意した。
尚、アルミパターンガラスと、COFデバイスは、端子間ピッチがそれぞれ38μm、L(端子幅)/S(端子間の距離)は3/2であり、COFデバイスの端子のTop幅は15μmであった。
次いで、COFデバイスを、仮貼りに用いたものと同じ圧着機で、80℃、0.5MPa、0.5秒間の条件で仮固定を行った。
図3は接続体の模式的な平面図を示しており、図3に示すように、COFデバイスの端子(部品側端子35)間に30Vの電圧を加え絶縁抵抗を測定した、絶縁抵抗が1.0×10-6Ω以下をショート発生とし、「ショート発生率」を求めた(初期)。同図の符号39は絶縁抵抗の測定器を示している。
<捕捉判定>
実施例1〜4、比較例1、2の接続体のアルミ端子裏面を微分干渉計(微分顕微鏡)で観察し、微小隆起(圧痕)数を数えた。
「ショート発生率」、「導通抵抗」及び「捕捉判定」の結果を下記表2に記載する。
実施例2と実施例4は、絶縁性粒子の種類が違うが、いずれも、「導通抵抗」「ショート発生率」「捕捉数判定」の結果が変わらず、絶縁性粒子の種類に関わらず、変形後の導電性粒子の粒径が、絶縁性粒子の粒径以上であれば、導通信頼性が高い接続体が得られることが分かる。
また、実施例3はショート発生率、捕捉数判定共に優れた結果が得られたが、導通抵抗が他の実施例に比べて高かった。
従って、本発明で、絶縁性粒子の望ましい含有量の範囲は、導電性粒子の合計体積の0.05倍を超え、かつ2.5倍未満、より望ましくは、0.2倍以上2倍以下である。
本発明の接続方法は、基板20と電気部品30の接続に限定されず、半導体チップ、抵抗素子、フレキシブル配線板、リジッド配線板等種々の電気部品同士の接続に用いることができる。
導電性粒子15が金属被膜樹脂粒子の場合、一般に破壊されるときの変形量は60%であり、破壊粒径は変形前の粒径Dの0.4倍である。
絶縁性粒子12として、分散溶剤に溶解も膨潤もしない粒子を用いれば、絶縁性粒子12の粒径が大きくならず、変形押圧力に近い押圧力で押圧する場合に、予備試験の時と異方導電性接着剤10の配合割合や、加熱温度等の使用条件が多少ずれても、導電性粒子15の粒径が絶縁性粒子12の粒径よりも小さくならない。
有機無機ハイブリッド粒子には、例えば、
1.無機粒子の表面で無機材料の構成材料と官能モノマーが結合した物
2.有機粒子の表面で有機粒子の構成材料と無機材料が結合した物
3.予め有機ポリマー骨格中に少なくとも1個の無機材料骨格が化学結合された無機含有樹脂で構成された物
等がある。
しかも、接着剤樹脂に、官能モノマーの官能基と重合可能な樹脂を含有させると、該樹脂が本圧着時に官能モノマーと重合し、硬化後の異方導電性接着剤10の機械的強度がより向上する。
絶縁性粒子12は有機無機ハイブリッド粒子に限定されず、異方導電性接着剤10中の分散溶剤に膨潤しないのであれば、樹脂粒子を用いることもできる。
導電性粒子と絶縁性粒子は、CV値20%以下、好ましくは10%以下の粒度精度を有するものが望ましい。CV値とは標準偏差を粒径で割った値である。
異方導電性接着剤10の固形分には、熱硬化性樹脂、熱可塑性樹脂、硬化剤、シラン以外にも、フィラー、着色剤等種々の添加剤を添加することができる。
Claims (7)
- 分散溶剤と、
前記分散溶剤に溶解する接着剤樹脂と、
導電性粒子と、
粒径が前記導電性粒子の粒径よりも小さい絶縁性粒子とを混合して、異方導電性接着剤を作成し、
基板の基板側端子と、電気部品の部品側端子を、前記異方導電性接着剤を挟んで対向させ、
前記基板と前記電気部品に熱と押圧力を加え、前記基板側端子と前記部品側端子で前記導電性粒子を挟み込み、前記導電性粒子を変形させる接続方法であって、
前記導電性粒子が破壊される破壊押圧力と、前記導電性粒子の粒径が前記絶縁性粒子の粒径と同じになる変形押圧力とを予め調べておき、
前記破壊押圧力と、前記変形押圧力のうち、小さい方の押圧力を上限値とし、前記上限値未満の押圧力を前記基板と前記電気部品に加える接続方法。 - 前記絶縁性粒子の合計体積が、前記導電性粒子の合計体積の0.2倍以上2倍以下になるよう混合して、前記異方導電性接着剤を作成する請求項1記載の接続方法。
- 前記分散溶剤に膨潤しない前記絶縁性粒子を混合して、前記異方導電性接着剤を作成する請求項1又は請求項2のいずれか1項記載の接続方法。
- 前記絶縁性粒子は、無機粒子の表面に官能モノマーが結合した有機無機ハイブリッド粒子であり、
前記接着剤樹脂は、前記有機無機ハイブリッド粒子の前記官能モノマーと重合可能な重合樹脂を含有する請求項1乃至請求項3のいずれか1項記載の接続方法。 - 前記絶縁性粒子は、有機粒子の表面に無機材料が結合した有機無機ハイブリッド粒子である請求項1乃至請求項3のいずれか1項記載の接続方法。
- 前記絶縁性粒子は、有機ポリマー骨格中に少なくとも1個の無機材料骨格が化学結合された無機含有樹脂で構成された請求項1乃至請求項3のいずれか1項記載の接続方法。
- 前記基板と、前記電気部品と、前記異方導電性接着剤とを有し、前記基板と前記電気部品とが機械的に接続された接合体であって、
前記基板側端子と前記部品側端子は、請求項1乃至請求項6のいずれか1項記載の接続方法によって電気的に接続された接合体。
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US5001542A (en) * | 1988-12-05 | 1991-03-19 | Hitachi Chemical Company | Composition for circuit connection, method for connection using the same, and connected structure of semiconductor chips |
JPH04115407A (ja) * | 1990-09-03 | 1992-04-16 | Soken Kagaku Kk | 異方導電性接着剤組成物 |
JPH04223348A (ja) | 1990-12-26 | 1992-08-13 | Oki Electric Ind Co Ltd | 異方導電接続構造 |
JPH05334912A (ja) | 1992-06-01 | 1993-12-17 | Casio Comput Co Ltd | 異方性導電接着剤および導電接続構造 |
JP3561748B2 (ja) | 1994-10-14 | 2004-09-02 | 綜研化学株式会社 | 異方導電性接着剤 |
JP3422243B2 (ja) * | 1998-01-07 | 2003-06-30 | 日本電気株式会社 | 樹脂フィルム |
WO2000033375A1 (en) | 1998-12-02 | 2000-06-08 | Seiko Epson Corporation | Anisotropic conductor film, semiconductor chip, and method of packaging |
JP3365367B2 (ja) | 1999-09-14 | 2003-01-08 | ソニーケミカル株式会社 | Cog実装品および接続材料 |
JP2002075488A (ja) * | 2000-09-04 | 2002-03-15 | Sekisui Chem Co Ltd | 異方性導電膜及びその製造方法 |
JP2002217239A (ja) * | 2001-01-19 | 2002-08-02 | Matsushita Electric Ind Co Ltd | 異方性導電膜 |
TW557237B (en) * | 2001-09-14 | 2003-10-11 | Sekisui Chemical Co Ltd | Coated conductive particle, coated conductive particle manufacturing method, anisotropic conductive material, and conductive connection structure |
JP2003165825A (ja) | 2001-11-30 | 2003-06-10 | Mitsui Chemicals Inc | 異方性導電ペーストおよびその使用方法 |
JP4761108B2 (ja) * | 2004-12-27 | 2011-08-31 | 荒川化学工業株式会社 | シラン変性ポリアミック酸微粒子の製造法、ポリイミド−シリカ複合微粒子の製造法、当該複合微粒子および導電性微粒子 |
JP2005347273A (ja) | 2005-06-06 | 2005-12-15 | Hitachi Chem Co Ltd | 熱架橋型回路接続材料及びそれを用いた回路板の製造方法 |
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HK1139785A1 (en) | 2010-09-24 |
KR20100021485A (ko) | 2010-02-24 |
CN101681858A (zh) | 2010-03-24 |
CN102448255B (zh) | 2015-04-22 |
US20100080995A1 (en) | 2010-04-01 |
KR101130002B1 (ko) | 2012-03-28 |
TWI394811B (zh) | 2013-05-01 |
TW200848486A (en) | 2008-12-16 |
JP2008305887A (ja) | 2008-12-18 |
WO2008149678A1 (ja) | 2008-12-11 |
CN101681858B (zh) | 2012-01-11 |
US8273207B2 (en) | 2012-09-25 |
CN102448255A (zh) | 2012-05-09 |
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