JP2016029698A - 接続体、及び接続体の製造方法 - Google Patents
接続体、及び接続体の製造方法 Download PDFInfo
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- JP2016029698A JP2016029698A JP2014242270A JP2014242270A JP2016029698A JP 2016029698 A JP2016029698 A JP 2016029698A JP 2014242270 A JP2014242270 A JP 2014242270A JP 2014242270 A JP2014242270 A JP 2014242270A JP 2016029698 A JP2016029698 A JP 2016029698A
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- H—ELECTRICITY
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- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
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Abstract
Description
以下では、本発明が適用された接続体として、ガラス基板に、電子部品として液晶駆動用のICチップが実装された液晶表示パネルを例に説明する。この液晶表示パネル10は、図1に示すように、ガラス基板等からなる二枚の透明基板11,12が対向配置され、これら透明基板11,12が枠状のシール13によって互いに貼り合わされている。そして、液晶表示パネル10は、透明基板11,12によって囲繞された空間内に液晶14が封入されることによりパネル表示部15が形成されている。
次いで、異方性導電フィルム1について説明する。異方性導電フィルム(ACF:Anisotropic Conductive Film)1は、図5に示すように、通常、基材となる剥離フィルム2上に導電性粒子4を含有するバインダー樹脂層(接着剤層)3が形成されたものである。異方性導電フィルム1は、熱硬化型あるいは紫外線等の光硬化型の接着剤であり、液晶表示パネル10の透明基板12の入出力端子19,21が形成された実装部27に貼着されるとともに液晶駆動用IC18が搭載され、熱圧着ヘッド33により熱加圧されることにより流動化して導電性粒子4が相対向する透明電極17の入出力端子19,21と液晶駆動用IC18の入出力バンプ23,25との間で押し潰され、加熱あるいは紫外線照射により、導電性粒子が押し潰された状態で硬化する。これにより、異方性導電フィルム1は、透明基板12と液晶駆動用IC18とを接続し、導通させることができる。
導電性粒子4としては、異方性導電フィルム1において使用されている公知の何れの導電性粒子を挙げることができる。導電性粒子4としては、例えば、ニッケル、鉄、銅、アルミニウム、錫、鉛、クロム、コバルト、銀、金等の各種金属や金属合金の粒子、金属酸化物、カーボン、グラファイト、ガラス、セラミック、プラスチック等の粒子の表面に金属をコートしたもの、或いは、これらの粒子の表面に更に絶縁薄膜をコートしたもの等が挙げられる。樹脂粒子の表面に金属をコートしたものである場合、樹脂粒子としては、例えば、エポキシ樹脂、フェノール樹脂、アクリル樹脂、アクリロニトリル・スチレン(AS)樹脂、ベンゾグアナミン樹脂、ジビニルベンゼン系樹脂、スチレン系樹脂等の粒子を挙げることができる。導電性粒子4の大きさは1〜10μmが好ましいが、本発明はこれに限定されるものではない。
異方性導電フィルム1は、導電性粒子4が平面視において所定の配列パターンで規則的に配列され、例えば図6に示すように、格子状に配列される。後述するように、導電性粒子4が平面視において規則的に配列された異方性導電フィルム1を用いることにより、透明基板12の実装部27及び液晶駆動用IC18の実装面18aの各外側に配列された相対向する第2の出力端子21bと第2の出力バンプ25bの距離が、内側に配列された相対向する第1の出力端子21aと第1の出力バンプ25aの距離に対して130%以内となり、導電性粒子4がランダムに分散されている異方性導電フィルムを用いた場合に比して、外側に配列された第2の出力端子21bと第2の出力バンプ25bとの距離が狭く、良好な導通性を有する。
また、異方性導電フィルム1は、バインダー樹脂3のみからなる絶縁性接着剤層と導電性粒子4を規則配列したバインダー樹脂3からなる導電性粒子含有層とを積層した構成において、導電性粒子含有層が、絶縁性接着剤層よりも粘度が高いものとしてもよい。
次いで、透明基板12に液晶駆動用IC18を接続する接続工程について説明する。先ず、透明基板12の入出力端子19,21が形成された実装部27上に異方性導電フィルム1を仮貼りする。次いで、この透明基板12を接続装置のステージ上に載置し、透明基板12の実装部27上に異方性導電フィルム1を介して液晶駆動用IC18を配置する。
ここで、液晶表示パネル1は、透明基板12の実装部27及び液晶駆動用IC18の実装面18aの各外側に配列された第2の出力端子21bと第2の出力バンプ25bの距離が、各内側に配列された第1の出力端子21aと第1の出力バンプ25aの距離よりも大きい。これは、液晶駆動用IC18は、透明基板12に接続される際に熱圧着ヘッド33によって加熱押圧されることにより、入出力バンプ23,25が形成されていない中央の領域において異方性導電フィルム1のバインダー樹脂の排除が進み、入力バンプ23及び相対的に実装面18aの内側に配列された第1の出力バンプ25aを支点に撓みが生じることによる。また、このとき、導電性粒子4がランダムに分散されている異方性導電フィルムを用いた場合には、導電性粒子4が偏在し、凝集することにより局所的に端子とバンプの距離が開くこともある。このため、外側に配列された第2の出力端子21bと第2の出力バンプ25bとの間で導電性粒子4が十分に圧縮されず、導通不良となる恐れがある。
液晶表示パネル1は、液晶駆動用IC18の出力バンプ25が配列された出力バンプ列26の中心部において、外側に配列された相対向する第2の出力端子21bと第2の出力バンプ25bの距離が、内側に配列された相対向する第1の出力端子21aと第1の出力バンプ25aの距離の130%以内となることが好ましい。液晶駆動用IC18の出力バンプ列26の中心部は、熱圧着ヘッド33の熱加圧面の各角部から最も離間し、第2の出力バンプ列26bにおいて相対的に最も撓みが大きい箇所となる。
また、液晶表示パネル1は、透明基板12と液晶駆動用IC18の各外側に配列された第2の出力端子21bと第2の出力バンプ25bの距離Doと、透明基板12と液晶駆動用IC18の各内側に配列された第1の出力端子21aと第1の出力バンプ25aの距離Diとの割合をD(=Do/Di)としたときに、液晶駆動用IC18の出力バンプ25の配列方向の両端における、透明基板12及び液晶駆動用IC18の各外側に配列された相対向する第2の出力端子21bと第2の出力バンプ25bの平均距離doと、各内側に配列された相対向する第1の出力端子21aと第1の出力バンプ25aとの平均距離diとの割合d(=do/di)の130%以内であることが好ましい。
液晶表示パネル1は、液晶駆動用IC18の出力バンプ25が配列された出力バンプ列26の中心部において、第2の出力端子21bと第2の出力バンプ25bの距離Doと、透明基板12と液晶駆動用IC18の各内側に配列された第1の出力端子21aと第1の出力バンプ25aの距離Diとの割合D(=Do/Di)が、出力バンプ25の配列方向の両端部における上記割合dの130%以内となることが好ましい。上述したように、液晶駆動用IC18の出力バンプ25が配列された出力バンプ列26の中心部は、熱圧着ヘッド33の熱加圧面の各角部から最も離間し、第2の出力バンプ列26bにおいて相対的に最も撓みが大きい箇所となる。
また、液晶表示パネル1は、透明基板12の第2の端子領域27b及び液晶駆動用IC18の第2のバンプ領域18cにおいて各外側に配列された相対向する第2の出力端子21bと第2の出力バンプ25bの距離Doは、透明基板12の第2の端子領域27b及び液晶駆動用IC18の第2のバンプ領域18cにおいて各外側に配列された第2の出力端子列22bと第2の出力バンプ列26bの両端部の相対向する第2の出力端子21bと第2の出力バンプ25bの距離と、透明基板12の第1の端子領域27a及び液晶駆動用IC18の第1のバンプ領域18bにおける入力端子列20と入力バンプ列24の両端部の相対向する入力端子19と入力バンプ23の距離との平均距離dAVEの110%以内であることが好ましい。
液晶表示パネル1は、液晶駆動用IC18の出力バンプ25が配列された出力バンプ列26の中心部における第2の出力端子21bと第2の出力バンプ25bの距離Doが、入力端子列20及び入力バンプ列24の両端部における相対向する入力端子19と入力バンプ23との各距離、並びに第2の出力端子列22b及び第2の出力バンプ列26bの両端部における第2の出力端子21bと第2の出力バンプ25bとの各距離の計4点の平均距離dAVEの110%以内となることが好ましい。上述したように、液晶駆動用IC18の出力バンプ25が配列された出力バンプ列26の中心部は、熱圧着ヘッド33の熱加圧面の各角部から最も離間し、第2の出力バンプ列26bにおいて相対的に最も撓みが大きい箇所となる。
次いで、本発明の実施例について説明する。第1の実施例では、導電性粒子が規則配列された異方性導電フィルムと、導電性粒子がランダムに分散された異方性導電フィルムを用いて、評価用ガラス基板に評価用ICを接続した接続体サンプルを作成し、断面観察により端子とバンプとの距離を導電性粒子の平均粒子径との割合で求めるとともに、評価用ICの内側の端子列における端子とバンプの距離に対する外側の端子列における端子とバンプの距離の割合を求めた。また、各接続体サンプルの初期導通抵抗、信頼性試験後の導通抵抗、隣接するICバンプ間のショート発生率を測定した。
評価用ICの接続に用いる異方性導電フィルムのバインダー樹脂層は、フェノキシ樹脂(商品名:YP50、新日鐵化学社製)60質量部、エポキシ樹脂(商品名:jER828、三菱化学社製)40質量部、カチオン系硬化剤(商品名:SI‐60L、三新化学工業社製)2質量部を溶剤に加えたバインダー樹脂組成物を調整し、このバインダー樹脂組成物を剥離フィルム上に塗布、乾燥することにより形成した。
断面観察及び導通抵抗測定用の評価素子として、外形;1.0mm×20mm、1.5mm×20mm、2.0mm×20mmの3種を用意した。いずれの評価素子も、厚みが0.2mmで、幅15μ×長さ100μm、高さ12μmのバンプ(Au‐plated)が形成されている。
ICバンプ間ショート測定用の評価素子として、外形;0.7mm×20mm、厚み0.2mm、バンプ(Au‐plated);幅15μ×長さ100μm、高さ12μm、バンプ間スペース幅;7.5μmの評価用ICを用いた。
図7、図8に示すように、各評価用IC18は、略矩形状に形成されるとともに、長手方向に沿って複数の入出力バンプ23,25が配列された入出力バンプ列24,26が設けられている。入力バンプ列24は、評価用ICの一方の側縁に一列で形成されている。出力バンプ列26は、評価用ICの他方の側縁に3列で形成されている。すなわち、評価用IC18は、評価用ICの長手方向に沿って複数の出力バンプ25が配列された3つの出力バンプ列26-1,26-2,26-3が、幅方向に並列されている。ここでは、評価用IC18の最も内側に配列された出力バンプ列26-1を1列目とし、最も外側に配列された出力バンプ列26-3を3列目とし、真ん中に配列された出力バンプ列26-2を2列目とする。
断面観察及び導通抵抗測定用の評価用IC及びICバンプ間ショート測定用の評価用ICが接続される評価用ガラス基板12として、外形;30mm×50mm、厚み0.5mm、断面観察及び導通抵抗測定用の評価用IC18のバンプと同サイズ同ピッチのITO配線からなる入出力端子19,21が複数配列された端子列が形成されたITOパターングラスを用いた。
実施例1では、導電性粒子がバインダー樹脂層に規則配列された異方性導電フィルムを用いた。実施例1で用いた異方性導電フィルムは、延伸可能なシート上に粘着剤を塗布し、その上に導電性粒子を格子状かつ均等に単層配列した後、当該シートを所定の延伸倍率で延伸させた状態で、バインダー樹脂層をラミネートすることにより製造した。使用した導電性粒子(商品名:AUL704、積水化学工業社製)は粒子径4μmで、粒子個数密度は28000個/mm2である。
実施例2では、粒子個数密度が5200個/mm2の異方性導電フィルムを用いた他は、実施例1と同じ条件とした。
実施例3では、粒子径3μmの導電性粒子(商品名:AUL703、積水化学工業社製)を、粒子個数密度50000個/mm2で規則配列させた異方性導電フィルムを用いた他は、実施例1と同じ条件とした。
実施例4では、粒子径5μmの導電性粒子(商品名:AUL705、積水化学工業社製)を、粒子個数密度18000個/mm2で規則配列させた異方性導電フィルムを用いた他は、実施例1と同じ条件とした。
比較例1では、バインダー樹脂組成物に導電性粒子を加えて調整し、剥離フィルム上に塗布、焼成することにより、バインダー樹脂層に導電性粒子がランダムに分散されている異方性導電フィルムを用いた。使用した導電性粒子(商品名:AUL704、積水化学工業社製)は粒子径4μmで、粒子個数密度は60000個/mm2である。
評価用IC(1×20mm)を用いた実施例1では、1列目の出力バンプ列26-1の中央部における出力端子21と出力バンプ25の距離D1は導電性粒子径(4μm)の62%で粒子捕捉数は37個、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3は導電性粒子径(4μm)の64%で粒子捕捉数は35個であった。1列目の出力端子21と出力バンプ25の距離D1に対する3列目の出力端子21と出力バンプ25の距離D3の割合D(=D3/D1)は、1.03であった。
評価用IC(1×20mm)を用いた実施例2では、1列目の出力バンプ列26-1の中央部における出力端子21と出力バンプ25の距離D1は導電性粒子径(4μm)の57%で粒子捕捉数は6個、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3は導電性粒子径(4μm)の62%で粒子捕捉数は6個であった。1列目の出力端子21と出力バンプ25の距離D1に対する3列目の出力端子21と出力バンプ25の距離D3の割合D(=D3/D1)は、1.09であった。
評価用IC(1×20mm)を用いた実施例3では、1列目の出力バンプ列26-1の中央部における出力端子21と出力バンプ25の距離D1は導電性粒子径(3μm)の69%で粒子捕捉数は61個、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3は導電性粒子径(3μm)の70%で粒子捕捉数は58個であった。1列目の出力端子21と出力バンプ25の距離D1に対する3列目の出力端子21と出力バンプ25の距離D3の割合D(=D3/D1)は、1.01であった。
評価用IC(1×20mm)を用いた実施例4では、1列目の出力バンプ列26-1の中央部における出力端子21と出力バンプ25の距離D1は導電性粒子径(5μm)の55%で粒子捕捉数は24個、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3は導電性粒子径(5μm)の57%で粒子捕捉数は23個であった。1列目の出力端子21と出力バンプ25の距離D1に対する3列目の出力端子21と出力バンプ25の距離D3の割合D(=D3/D1)は、1.04であった。
評価用IC(1×20mm)を用いた比較例1では、1列目の出力バンプ列26-1の中央部における出力端子21と出力バンプ25の距離D1は導電性粒子径(4μm)の58%で粒子捕捉数は27個、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3は導電性粒子径(4μm)の84%で粒子捕捉数は7個であった。1列目の出力端子21と出力バンプ25の距離D1に対する3列目の出力端子21と出力バンプ25の距離D3の割合D(=D3/D1)は、1.45であった。
表1に示すように、導電性粒子が規則配列された異方性導電フィルムを用いて作成された実施例1〜4に係る接続体サンプルによれば、いずれも最も外側に配列された3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3は、1列目の出力バンプ列26-1の中央部における出力端子21と出力バンプ25の距離D1の130%以下と、1列目と3列目とで差がほとんどなく、導電性粒子の圧縮により良好な導通性を備える。
次いで、第2の実施例について説明する。第2の実施例では、図7中B−B’及びC−C’に示すように、実施例1〜4、比較例1に係る各接続体サンプルの入出力バンプ列24,26の両端部を評価用IC18の幅方向に切断し、断面観察した。そして、1,3列目の出力バンプ列26-1,26-3の両端部における出力端子21と出力バンプ25の平均距離d1,d3を導電性粒子の粒子径に対する割合で求めるとともに、1列目の出力バンプ列26-1両端部の平均距離d1に対する3列目の出力バンプ列26-3両端部の平均距離の割合d(=d3/d1)を算出した。なお、1,3列目の出力バンプ列26の両端部における端子とバンプの距離差は30%以内であった。
表2に示すように、評価用IC(1×20mm)を用いた実施例1では、1列目の出力バンプ列26-1の両端部における出力端子21と出力バンプ25の平均距離d1は導電性粒子径(4μm)の58%で平均粒子捕捉数は34個、3列目の出力バンプ列26-3の両端部における出力端子21と出力バンプ25の距離d3は導電性粒子径(4μm)の59%で平均粒子捕捉数は33個であった。
評価用IC(1×20mm)を用いた実施例2では、1列目の出力バンプ列26-1の両端部における出力端子21と出力バンプ25の平均距離d1は導電性粒子径(4μm)の57%で平均粒子捕捉数は5個、3列目の出力バンプ列26-3の両端部における出力端子21と出力バンプ25の平均距離d3は導電性粒子径(4μm)の59%で平均粒子捕捉数は6個であった。
評価用IC(1×20mm)を用いた実施例3では、1列目の出力バンプ列26-1の両端部における出力端子21と出力バンプ25の平均距離d1は導電性粒子径(3μm)の67%で平均粒子捕捉数は59個、3列目の出力バンプ列26-3の両端部における出力端子21と出力バンプ25の平均距離d3は導電性粒子径(3μm)の68%で平均粒子捕捉数は57個であった。
評価用IC(1×20mm)を用いた実施例4では、1列目の出力バンプ列26-1の両端部における出力端子21と出力バンプ25の平均距離d1は導電性粒子径(5μm)の55%で平均粒子捕捉数は24個、3列目の出力バンプ列26-3の両端部における出力端子21と出力バンプ25の平均距離d3は導電性粒子径(5μm)の57%で平均粒子捕捉数は26個であった。
評価用IC(1×20mm)を用いた比較例1では、1列目の出力バンプ列26-1の両端部における出力端子21と出力バンプ25の平均距離d1は導電性粒子径(4μm)の55%で平均粒子捕捉数は27個、3列目の出力バンプ列26-3の両端部における出力端子21と出力バンプ25の平均距離d3は導電性粒子径(4μm)の59%で平均粒子捕捉数は23個であった。
表2に示すように、導電性粒子が規則配列された異方性導電フィルムを用いて作成された実施例1〜4に係る接続体サンプルによれば、いずれも、最も出力端子21と出力バンプ25の距離が開きやすい出力バンプ列26の中央部における1列目に対する3列目の出力端子21と出力バンプ25の距離の割合Dが、比較的出力端子21と出力バンプ25とが近接する出力バンプ列26の両端部における1列目に対する3列目の出力端子21と出力バンプ25の距離の割合dの130%以下と、差がほとんどなく、導電性粒子が押し込まれ良好な導通性を備える。
次いで、第3の実施例について説明する。第3の実施例では、実施例1〜4及び比較例1に係る各接続体サンプルについて、図7中に示す入力バンプ列24の各両端及び最も外側に配列された3列目の出力バンプ列26-3の両端における出力端子21と出力バンプ25の平均距離dAVEと、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3との割合(=D3/dAVE)を算出した。これは、最も外側に配列された入出力バンプ列24,26の各両端は、熱圧着ヘッドの押圧力を受けやすく、いずれも出力端子21と出力バンプ25の距離が狭く導電性粒子が押し込まれやすいことから、最も出力端子21と出力バンプ25の距離が開きやすい3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3を、最も外側に配列された入出力バンプ列24,26の各両端における出力端子21と出力バンプ25の平均距離dAVEとの対比で評価するものである。3列目の出力バンプ列26-3の中央部における距離D3が最も外側に配列された入出力バンプ列24,26の各両端部における平均距離dAVEと大差ない場合、他のすべての出力端子21と出力バンプ25は、最も外側に配列された入出力バンプ列24,26の各両端部と同様に、距離が狭く導電性粒子が押し込まれているものと考えられる。
表3に示すように、評価用IC(1×20mm)を用いた実施例1では、3列目の出力バンプ列26-3の左端の出力バンプ25Lと出力端子21との距離d-26Lは導電性粒子径(4μm)の59%、同右端の出力バンプ25Rと出力端子21の距離d-26Rは同60%、入力バンプ列24の左端の入力バンプ23Lと入力端子19の距離d-24Lは同58%、同右端の入力バンプ23Rと入力端子19の距離d-24Rは同61%で、両出力バンプ25L、25R及び両入力バンプ23L,23Rにおける入出力端子の平均距離dAVEは59.5%である。この平均距離dAVEと、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3(=64%)との割合(=D3/dAVE)は、1.08となった。
評価用IC(1×20mm)を用いた実施例2では、3列目の出力バンプ列26-3の左端の出力バンプ25Lと出力端子21との距離d-26Lは導電性粒子径(4μm)の59%、同右端の出力バンプ25Rと出力端子21の距離d-26Rは同57%、入力バンプ列24の左端の入力バンプ23Lと入力端子19の距離d-24Lは同60%、同右端の入力バンプ23Rと入力端子19の距離d-24Rは同58%で、両出力バンプ25L、25R及び両入力バンプ23L,23Rにおける入出力端子の平均距離dAVEは58.5%である。この平均距離dAVEと、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3(=62%)との割合(=D3/dAVE)は、1.06となった。
評価用IC(1×20mm)を用いた実施例3では、3列目の出力バンプ列26-3の左端の出力バンプ25Lと出力端子21との距離d-26Lは導電性粒子径(3μm)の68%、同右端の出力バンプ25Rと出力端子21の距離d-26Rは同67%、入力バンプ列24の左端の入力バンプ23Lと入力端子19の距離d-24Lは同65%、同右端の入力バンプ23Rと入力端子19の距離d-24Rは同66%で、両出力バンプ25L、25R及び両入力バンプ23L,23Rにおける入出力端子の平均距離dAVEは66.5%である。この平均距離dAVEと、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3(=70%)との割合(=D3/dAVE)は、1.05となった。
評価用IC(1×20mm)を用いた実施例4では、3列目の出力バンプ列26-3の左端の出力バンプ25Lと出力端子21との距離d-26Lは導電性粒子径(5μm)の57%、同右端の出力バンプ25Rと出力端子21の距離d-26Rは同58%、入力バンプ列24の左端の入力バンプ23Lと入力端子19の距離d-24Lは同54%、同右端の入力バンプ23Rと入力端子19の距離d-24Rは同56%で、両出力バンプ25L、25R及び両入力バンプ23L,23Rにおける入出力端子の平均距離dAVEは56.25%である。この平均距離dAVEと、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3(=57%)との割合(=D3/dAVE)は、1.01となった。
評価用IC(1×20mm)を用いた比較例1では、3列目の出力バンプ列26-3の左端の出力バンプ25Lと出力端子21との距離d-26Lは導電性粒子径(4μm)の59%、同右端の出力バンプ25Rと出力端子21の距離d-26Rは同61%、入力バンプ列24の左端の入力バンプ23Lと入力端子19の距離d-24Lは同57%、同右端の入力バンプ23Rと入力端子19の距離d-24Rは同58%で、両出力バンプ25L、25R及び両入力バンプ23L,23Rにおける入出力端子の平均距離dAVEは58.75%である。この平均距離dAVEと、3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3(=84%)との割合(=D3/dAVE)は、1.43となった。
表3に示すように、導電性粒子が規則配列された異方性導電フィルムを用いて作成された実施例1〜4に係る接続体サンプルによれば、いずれも、最も端子とバンプの距離が開きやすい3列目の出力バンプ列26-3の中央部における出力端子21と出力バンプ25の距離D3が、最も外側に配列された入出力バンプ列24,26の各両端部における出力端子21と出力バンプ25の平均距離dAVEの110%以下と差がほとんどなく、導電性粒子が押し込まれ良好な導通性を備える。
次いで、第4の実施例について説明する。第4の実施例では、評価素子として、導電性粒子を捕捉するバンプ面に、凹凸部を有するICを用いて接続体サンプルを形成した。この凹凸部の最大高低差は導電性粒子の粒子径の50%以内となるものを評価に用いた。これは接続前のバンプ表面を高精度形状測定システム(KS−1100、(株)キーエンス)で測定し、更に断面観察の結果から求めた。評価したバンプ面の凹凸の最大高低差は、実施例1、2及び比較例1では2μm、実施例3では1.5μm、実施例4では2.5μmであった。
評価用IC(1×20mm)を用いた実施例1では、1列目の出力バンプ列26-1の中央部における出力バンプ25の凹部領域上の粒子捕捉数は2個、凸部領域上の粒子捕捉数は17個であり、3列目の出力バンプ列26-3の中央部における出力バンプ25の凹部領域上の粒子捕捉数は1個、凸部領域上の粒子捕捉数は16個であった。
評価用IC(1×20mm)を用いた実施例2では、1列目の出力バンプ列26-1の中央部における出力バンプ25の凹部領域上の粒子捕捉数は0個、凸部領域上の粒子捕捉数は4個であり、3列目の出力バンプ列26-3の中央部における出力バンプ25の凹部領域上の粒子捕捉数は0個、凸部領域上の粒子捕捉数は3個であった。
評価用IC(1×20mm)を用いた実施例3では、1列目の出力バンプ列26-1の中央部における出力バンプ25の凹部領域上の粒子捕捉数は4個、凸部領域上の粒子捕捉数は37個であり、3列目の出力バンプ列26-3の中央部における出力バンプ25の凹部領域上の粒子捕捉数は2個、凸部領域上の粒子捕捉数は36個であった。
評価用IC(1×20mm)を用いた実施例4では、1列目の出力バンプ列26-1の中央部における出力バンプ25の凹部領域上の粒子捕捉数は2個、凸部領域上の粒子捕捉数は14個であり、3列目の出力バンプ列26-3の中央部における出力バンプ25の凹部領域上の粒子捕捉数は1個、凸部領域上の粒子捕捉数は13個であった。
評価用IC(1×20mm)を用いた比較例1では、1列目の出力バンプ列26-1の中央部における出力バンプ25の凹部領域上の粒子捕捉数は2個、凸部領域上の粒子捕捉数は10個であり、3列目の出力バンプ列26-3の中央部における出力バンプ25の凹部領域上の粒子捕捉数は1個、凸部領域上の粒子捕捉数は3個であった。
表4に示すように、導電性粒子が規則配列された異方性導電フィルムを用いて作成された実施例1〜4に係る接続体サンプルによれば、いずれも1、3列目の出力バンプ列26-1、26-3の中央部における出力バンプ25の凸部領域において3個以上の圧痕が観察され、1列目と3列目とで差がほとんどなく、導電性粒子の圧縮により良好な導通性を備える。これは、導電性粒子を捕捉するバンプ面に形成された凹部領域において導電性粒子を十分に押し込むことができない場合でも、導電性粒子が規則配列されることにより凸部領域にも捕捉されているため、当該凸部領域において十分に押し込まれたことによる。
Claims (13)
- 複数の端子が配列された端子列が上記端子の配列方向と直交する幅方向に複数並列された回路基板と、
上記複数の端子列に応じて、複数のバンプが配列されたバンプ列が上記バンプの配列方向と直交する幅方向に複数並列された電子部品とを備え、
導電性粒子が配列された異方性導電接着剤を介して上記回路基板上に上記電子部品が接続された接続体において、
上記回路基板及び上記電子部品の各外側に配列された相対向する端子とバンプの距離が、上記回路基板及び上記電子部品の各内側に配列された相対向する端子とバンプの距離よりも大きい接続体。 - 上記回路基板及び上記電子部品の各外側に配列された相対向する端子とバンプの距離は、上記回路基板及び上記電子部品の各内側に配列された相対向する端子とバンプの距離の130%以内である請求項1記載の接続体。
- 上記電子部品の上記バンプ列の中心部において、上記回路基板及び上記電子部品の各外側に配列された相対向する端子とバンプの距離が、上記回路基板及び上記電子部品の各内側に配列された相対向する端子とバンプの距離の130%以内である請求項2記載の接続体。
- 上記回路基板及び上記電子部品の各外側に配列された相対向する端子とバンプの距離Doと、上記回路基板及び上記電子部品の各内側に配列された相対向する端子とバンプの距離Diとの割合D(=Do/Di)は、
上記電子部品の上記バンプの配列方向の両端における、上記回路基板及び上記電子部品の各外側に配列された相対向する端子とバンプの平均距離doと、上記回路基板及び上記電子部品の各内側に配列された相対向する端子とバンプの平均距離diとの割合d(=do/di)の130%以内である請求項1〜3のいずれか1項に記載の接続体。 - 上記電子部品の上記バンプ列の中心部における上記割合Dが、上記割合dの130%以内である請求項4記載の接続体。
- 上記回路基板は、一の上記端子列が形成された第1の端子領域と、上記端子列が幅方向に複数並列された第2の端子領域とを有し、
上記電子部品は、一の上記バンプ列が形成された第1のバンプ領域と、上記バンプ列が幅方向に複数並列された第2のバンプ領域とを有し、
上記回路基板及び上記電子部品の上記第2の端子領域及び上記第2のバンプ領域において各外側に配列された相対向する端子とバンプの距離Doは、
上記回路基板及び上記電子部品の上記第2の端子領域及び上記第2のバンプ領域における各外側に配列された端子列とバンプ列の両端部における相対向する端子とバンプの距離と、上記回路基板及び上記電子部品の上記第1の端子領域及び上記第1のバンプ領域における上記端子列とバンプ列の両端部における相対向する端子とバンプの距離との平均距離dAVEの110%以内である請求項1〜5のいずれか1項に記載の接続体。 - 上記第1の端子領域及び上記第1のバンプ領域における上記端子列とバンプ列は、
上記第1の端子領域に複数の上記端子列が上記端子の配列方向と直交する幅方向に複数並列され、かつ上記第1のバンプ領域に上記バンプ列が上記バンプの配列方向と直交する幅方向に複数並列されている場合、上記第1の端子領域及び上記第1のバンプ領域における各外側に配列された端子列及びバンプ列である請求項6に記載の接続体。 - 上記電子部品の上記バンプ列の中心部における上記距離Doが、上記平均距離dAVEの110%以内である請求項6又は7に記載の接続体。
- 上記導電性粒子が配列されている上記異方性導電接着剤を用いて形成される請求項1〜8のいずれか1項に記載の接続体。
- 上記導電性粒子は、平均粒径が5μm以下である請求項1〜9のいずれか1項に記載の接続体。
- 上記バンプは、上記導電性粒子を捕捉するバンプ面に、上記導電性粒子の粒子径の50%以内の高低差を有する凹凸部が形成された請求項1〜10のいずれか1項に記載の接続体。
- 複数の端子が配列された端子列が幅方向に複数並列された回路基板と、
上記複数の端子列に応じて、複数のバンプが配列されたバンプ列が幅方向に複数並列された電子部品とを備え、
導電性粒子が配列された異方性導電接着剤を介して上記回路基板上に上記電子部品を搭載し、
上記電子部品を押圧するとともに上記異方性導電接着剤を硬化させる接続体の製造方法において、
上記回路基板及び上記電子部品の各外側に配列された相対向する端子とバンプの距離が、上記回路基板及び上記電子部品の各内側に配列された相対向する端子とバンプの距離よりも大きい接続体の製造方法。 - 上記異方性導電接着剤は、上記導電性粒子を含有する導電性粒子含有層と、上記導電性粒子を含有しない絶縁性接着剤層とを備え、上記導電性粒子含有層は、上記絶縁性接着剤層よりも粘度が高い請求項12記載の接続体の製造方法。
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