JP2010287838A - 電極の接続構造、これに用いる導電性接着剤及び電子機器 - Google Patents
電極の接続構造、これに用いる導電性接着剤及び電子機器 Download PDFInfo
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Abstract
【解決手段】第1の接続用電極2と第2の接続用電極10とが、導電性接着剤層9を介して接続された電極の接続構造であって、少なくとも上記の接続用電極に設けられた有機膜6,11と、上記導電性接着剤層の厚み方向に長径方向を配向して配合されているとともに、平均長径が、少なくとも上記有機膜と上記導電性接着剤層との合計厚みより大きい導電性粒子8とを備え、上記導電性粒子が上記有機膜を突き破って、上記第1の接続用電極と上記第2の接続用電極とに接触させられている。
【選択図】図4
Description
(導電性接着剤の作製)
導電性粒子として、長径Lの平均値が3μm、短径Rの平均値が0.2μmである直鎖状ニッケル微粒子を用いた。また、絶縁性の熱硬化樹脂として、2種類のビスフェノールA型の固形エポキシ樹脂〔(1)ジャパンエポキシレジン(株)製、商品名エピコート1256、及び(2)エピコート1004〕、ナフタレン型エポキシ樹脂〔(3)大日本インキ化学工業(株)製、商品名エピクロン4032D〕を使用した。また、熱可塑性であるポリビニルブチラール樹脂〔(4)積水化学工業(株)製、商品名エスレックBM−1〕を使用し、マイクロカプセル型潜在性硬化剤としては、(5)マイクロカプセル型イミダゾール系硬化剤〔旭化成エポキシ(株)製、商品名ノバキュアHX3941〕を使用した。これら(1)〜(5)を重量比で(1)35/(2)20/(3)25/(4)10/(5)30の割合で配合した。
幅150μm、長さ4mm、高さ18μmの銅電極である接続用電極が150μm間隔で30個配列されたフレキシブルプリント配線板を用意した。接続用電極には、2−フェニル−4−メチル−5−ベンジルイミダゾールを含む酸化防止膜を形成した。その熱分解温度は310℃、平均膜厚は0.20μmであった。
上記フレキシブルプリント配線板を、窒素をフローすることによって酸素濃度1%以下としたリフロー炉槽内において、ピーク温度を260℃とした半田リフロー処理を施した。その後、フレキシブルプリント配線板同士を、連続する30箇所の接続抵抗が測定可能なデイジーチェーンを形成するように対向させて配置した。これらフレキシブルプリント配線板の間に作製した上記導電性接着剤を挟み、190℃に加熱しながら、5MPaの圧力を作用させて、導電性接着剤層9の厚みDが1.5μmの厚みになるまで加圧して、フレキシブルプリント配線板同士の接合体を得た。
上記接合体において、上下の接続用電極とこれに挟まれた導電性接着剤の積層体について、上記30箇所の抵抗値を四端子法により求め、求めた値を30で除することにより、接続された1箇所あたりの接続抵抗を求めた。そして、接続抵抗の値が、50mオーム以下の場合を、導電性を確保したものとした。
比較例として、上記導電性粒子として、直径が0.5μmの球状粒子を採用した他は、上記実施例と同じ手法及び材料から得られた同一寸法の電極接続構造を用いた。
表1から明らかなように、長径Lの値を、有機膜6の厚みT1 と、有機膜11の厚みT2 と、接着剤層9の厚みDの合計厚みHより大きく設定することにより、より電気抵抗の低い電極の接続構造を得ることができる。
2 第1の接続用電極
3 配線板(フレキシブルプリント配線板)
6 有機膜
5 電極の接続構造
7 電子部品
8 導電性粒子
9 導電性接着剤層
10 第2の接続用電極
11 有機膜
Claims (8)
- 第1の接続用電極と第2の接続用電極とが、導電性接着剤層を介して接続された電極の接続構造であって、
少なくとも上記第1の接続用電極に設けられた有機膜と、
上記導電性接着剤層の厚み方向に長径方向を配向して配合されているとともに、平均長径が、少なくとも上記導電性接着剤層と上記有機膜との合計厚みより大きい導電性粒子とを備え、
上記導電性粒子が上記有機膜を突き破って、上記第1の接続用電極と上記第2の接続用電極とに接触させられている、電極の接続構造。 - 上記導電性接着剤層の厚み方向と直交する断面において、短径が0.01〜1μmの導電性粒子が、30,000〜300,000個/mm2 配合されている、請求項1に記載の電極の接続構造。
- 上記導電性粒子は、微細な金属粒子が多数、直鎖状に繋がった形状、又は針形状を有する金属粉末である、請求項1又は請求項2のいずれかに記載の電極の接続構造。
- 上記導電性粒子のアスペクト比が5以上である、請求項1から請求項3のいずれか1項に記載の電極の接続構造。
- 上記導電性接着剤層がフィルム状導電性接着剤から形成されている、請求項1から請求項4のいずれか1項に記載の電極の接続構造。
- 接続される電極の少なくとも一方に有機膜が形成された電極の接続構造に用いられるフィルム状の導電性接着剤であって、
熱硬化性樹脂を含む接着剤成分と、
長径方向がフィルムの厚み方向に配向された導電性粒子とを含むとともに、
上記導電性粒子は、平均長径が、上記有機膜と電極接続後の接着剤層の厚みとの合計厚みより大きく設定されている、導電性接着剤。 - 上記導電性接着剤の厚み方向と直交する断面において、短径が0.01〜1μmの導電性粒子が、30,000〜300,000個/mm2 配合されている、請求項6に記載の導電性接着剤。
- 請求項1から請求項5のいずれか1項に記載の電極の接続構造を備える、電子機器。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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JP2009142283A JP4877535B2 (ja) | 2009-06-15 | 2009-06-15 | プリント配線板における電極の接続構造、これに用いる導電性接着剤及び電子機器 |
CN201080003565.5A CN102246607B (zh) | 2009-06-15 | 2010-06-04 | 电极连接结构、用于电极连接结构的导电粘合剂、以及电子装置 |
EP10789377A EP2445324A1 (en) | 2009-06-15 | 2010-06-04 | Electrode connection structure, conductive adhesive used therefor, and electronic device |
KR1020117013633A KR20120038390A (ko) | 2009-06-15 | 2010-06-04 | 전극의 접속 구조, 이것에 이용하는 도전성 접착제 및 전자기기 |
PCT/JP2010/059500 WO2010147002A1 (ja) | 2009-06-15 | 2010-06-04 | 電極の接続構造、これに用いる導電性接着剤及び電子機器 |
US13/139,926 US8470438B2 (en) | 2009-06-15 | 2010-06-04 | Electrode-connecting structure, conductive adhesive used for the same, and electronic apparatus |
TW99119103A TW201112274A (en) | 2009-06-15 | 2010-06-11 | Electrode connection structure, conductive adhesive used therefor, and electronic device |
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JP2009142283A JP4877535B2 (ja) | 2009-06-15 | 2009-06-15 | プリント配線板における電極の接続構造、これに用いる導電性接着剤及び電子機器 |
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JP (1) | JP4877535B2 (ja) |
KR (1) | KR20120038390A (ja) |
CN (1) | CN102246607B (ja) |
TW (1) | TW201112274A (ja) |
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JP4998520B2 (ja) * | 2009-06-15 | 2012-08-15 | 住友電気工業株式会社 | 電極の接続方法、電極の接続構造及び電子機器 |
KR101953962B1 (ko) | 2017-01-09 | 2019-03-04 | 서울대학교산학협력단 | 비아를 포함하는 신축성 기판 형성 방법 및 비아를 가지는 신축성 기판 |
US11462472B2 (en) * | 2020-08-04 | 2022-10-04 | Micron Technology, Inc. | Low cost three-dimensional stacking semiconductor assemblies |
CN113404394A (zh) * | 2021-05-07 | 2021-09-17 | 龙武 | 一种基于雷达技术的应急自锁型汽车车门控制系统 |
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- 2010-06-04 KR KR1020117013633A patent/KR20120038390A/ko not_active Application Discontinuation
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JP4877535B2 (ja) | 2012-02-15 |
WO2010147002A1 (ja) | 2010-12-23 |
US8470438B2 (en) | 2013-06-25 |
US20110250395A1 (en) | 2011-10-13 |
KR20120038390A (ko) | 2012-04-23 |
CN102246607B (zh) | 2014-05-07 |
TW201112274A (en) | 2011-04-01 |
CN102246607A (zh) | 2011-11-16 |
EP2445324A1 (en) | 2012-04-25 |
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