JP2017168465A - 異方性導電フィルム、接続構造体、及び接続構造体の製造方法 - Google Patents
異方性導電フィルム、接続構造体、及び接続構造体の製造方法 Download PDFInfo
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Abstract
Description
同方向に連続した複数の溝が形成されたシート2は、図3に示すように、例えば所定の溝10が形成された樹脂シートであり、例えばペレットを溶融させた状態で溝パターンが形成された金型に流し込み、冷やして固めることで所定の溝10を転写させる方法により形成することができる。あるいは、シート2は、溝パターンが形成された金型を樹脂シートの軟化点以上の温度に加熱し、当該金型に樹脂シートを押し付けることで転写する方法により形成することができる。
導電性粒子3としては、異方性導電フィルム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3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。
溝10に導電性粒子3が充填、配列されたシート2にラミネートされる第1の樹脂フィルム4は、延伸可能なベースフィルム6上に光又は熱硬化性の樹脂層5が形成された熱硬化型あるいは紫外線硬化型の接着フィルムである。第1の樹脂フィルム4は、シート2にラミネートされることにより、溝10のパターンに配列された導電性粒子3が転着され、異方性導電フィルム1を構成する。
また、導電性粒子3が転着された第1の樹脂フィルム4にラミネートされる第2の樹脂フィルム7も、第1の樹脂フィルム4と同様に、ベースフィルム9上に光又は熱硬化性の樹脂層8が形成された熱硬化型あるいは紫外線硬化型の接着フィルムである。第2の樹脂フィルム7の樹脂層8は第1の樹脂フィルム4の樹脂層5と同一のものを用いることができ、ベースフィルム9は第1の樹脂フィルム4のベースフィルム6と同一のものを用いることができる。第2の樹脂フィルム7は、導電性粒子3が転着された第1の樹脂フィルム4にラミネートされることにより、第1の樹脂フィルム4とともに異方性導電フィルム1を構成する。
次いで、異方性導電フィルム1の製造工程について説明する。
本実施形態では、スキージ112で余分な導電性粒子103を除去する際に、導電性粒子103の表面のメッキ等に多少の損傷を与えることがあるが、完成後の異方性導電フィルム101の導通信頼性等の性能に支障をきたす程度の損傷ではない。スキージ112で余分な導電性粒子103を除去して、必要な導電性粒子103の配列を整えると、図7(c)に示すように、シート102の溝110への導電性粒子103の充填が完了する。
次に、本発明の一実施形態に係る異方性導電フィルムの構成について、図面を使用しながら説明する。図10は、本発明の一実施形態に係る異方性導電フィルムの部分斜視図であり、図11(a)は、図10のP−P断面図であり、図11(b)は、図10のQ−Q断面図である。
次に、本発明の一実施形態に係る接続構造体の構成について、図面を使用しながら説明する。図12は、本発明の一実施形態に係る異方性導電フィルムを適用した接続構造体の構成を示す概略断面図である。本発明の一実施形態に係る接続構造体50は、例えば、図12に示すように、前述した異方性導電フィルム1を介して、ICチップ等の電子部品52をフレキシブル配線基板や液晶パネル等の基板54上に電気的及び機械的に接続固定したものである。電子部品52には、接続端子としてバンプ56が形成されている。一方、基板54の上面には、バンプ56と対向する位置に電極58が形成されている。
Claims (6)
- 樹脂層と、
上記樹脂層に接した複数の導電性粒子とを備え、
上記導電性粒子は、上記樹脂層において第1の方向に配列して形成した粒子列が上記第1の方向と異なる第2の方向に複数並列して設けられ、
上記粒子列は、上記導電性粒子がフィルムの長手方向に対して斜行する方向に配列されるとともに、個々の上記導電粒子の一方の端からなる直線によって上記導電性粒子の粒子径よりも大きい幅を持って形成され、幅方向の何れか一方の端に上記導電性粒子の一方の端部が接している異方性導電フィルム。 - 上記粒子列は、上記導電性粒子の粒子径の2.5倍未満の幅を有する請求項1に記載の異方性導電フィルム。
- 上記導電性粒子は、上記樹脂層において第1の方向に規則的に配列され、
上記粒子列は、上記第2の方向に規則的に複数並列されている請求項1又は2に記載の異方性導電フィルム。 - 上記樹脂層は少なくとも第1の樹脂層と第2の樹脂層との2層構成よりなり、
上記導電性粒子は、少なくとも上記第1の樹脂層に接している請求項1〜3のいずれか1項に記載の異方性導電フィルム。 - 電子部品の接続に、請求項1〜4のいずれか1項に記載の異方性導電フィルムを用いた接続構造体。
- 電子部品の接続に、請求項1〜4のいずれか1項に記載の異方性導電フィルムを用いた接続構造体の製造方法。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210009383A (ko) | 2018-08-08 | 2021-01-26 | 데쿠세리아루즈 가부시키가이샤 | 이방성 도전 필름 |
| US11694988B2 (en) | 2018-08-08 | 2023-07-04 | Dexerials Corporation | Anisotropic conductive film |
| KR20220116052A (ko) | 2020-02-12 | 2022-08-19 | 데쿠세리아루즈 가부시키가이샤 | 이방성 도전 필름 |
| US12590194B2 (en) | 2020-02-12 | 2026-03-31 | Dexerials Corporation | Anisotropic conductive film |
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