JP2018207015A - 電子装置、電子装置の製造方法及び電子機器 - Google Patents
電子装置、電子装置の製造方法及び電子機器 Download PDFInfo
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- JP2018207015A JP2018207015A JP2017112759A JP2017112759A JP2018207015A JP 2018207015 A JP2018207015 A JP 2018207015A JP 2017112759 A JP2017112759 A JP 2017112759A JP 2017112759 A JP2017112759 A JP 2017112759A JP 2018207015 A JP2018207015 A JP 2018207015A
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Abstract
【解決手段】電子装置1は、端子11を有する電子部品10と、電子部品10に対向して設けられ端子21を有する電子部品20と、電子部品10と電子部品20との間に設けられた接着剤30とを含む。電子部品20の端子21は、電子部品10の端子11に接触する先端部位21aaと、その端子11の外側に位置する先端部位21abとを備える。電子部品10と電子部品20とが接着剤30で接着され、端子11と端子21の先端部位21aaとの接触が保持される。端子11と端子21との接触部の単位面積当たりの荷重を増大させ、圧接力を高める。
【選択図】図5
Description
図1は圧接工法の説明図である。図1(A)には、基板及び半導体チップの配置工程の要部断面模式図を示している。図1(B)には、基板及び半導体チップの接合工程の要部断面模式図を示している。
基板100には、パッケージ基板、メイン基板、インターポーザといった各種基板、また、リジット基板、フレキシブル基板といった各種基板が用いられる。基板100の表面、又は表面及び内層には、図示しない配線等の導体部が設けられ、基板100の表面には、そのような導体部に接続されたパッド110(端子)が設けられる。基板100の導体部及びパッド110には、銅(Cu)、アルミニウム(Al)等の各種導体材料が用いられる。
圧接工法によって基板100上に半導体チップ200を実装する際には、図1(A)に示すように、予め基板100上に接着剤300が設けられる。接着剤300には、例えば、熱硬化型樹脂、又は無機系若しくは有機系の絶縁性フィラーを含有する熱硬化型樹脂が用いられる。接着剤300には、熱硬化型樹脂のほか、光硬化型樹脂が用いられてもよい。所定の材料が用いられた接着剤300が、塗布法等により、基板100上に設けられる。そして、ボンディングツール400が用いられ、半導体チップ200が、そのバンプ210の、基板100のパッド110に対する位置合わせが行われて、接着剤300を設けた基板100の上方に対向配置される。
図2は圧接工法の接合メカニズムの説明図である。図2には、接着剤を介して接合された基板及び半導体チップの要部断面模式図を示している。
基板100上に接着剤300が設けられ、半導体チップ200の加圧及び加熱が行われる際には、その加熱とその後の冷却により、図3に示すように、基板100及び半導体チップ200に反りが生じる。基板100と半導体チップ200との間には熱膨張係数差があり、基板100には、半導体チップ200よりも大きな反り、例えば、半導体チップの約50倍といった大きな反りが生じる。
例えば、図4(A)に示すように、基板100の、半導体チップ200下の領域に、凹部140を設ける。凹部140を設けることで、基板100に半導体チップ200よりも大きな反りが生じる場合にも、基板100と半導体チップ200との間に間隙を確保する。これにより、基板100と半導体チップ200との接触、或いは接着剤300に含有されるフィラーの半導体チップ200への衝突を回避することが可能になる。そのため、ボンディング荷重G1を増大させてパッド110とバンプ210との圧接力を増大させることも可能となる。しかし、このように凹部140を設けると、基板100に設ける配線の配置自由度の低下、それによる適用品種の制限等の不都合を招く。
まず、第1の実施の形態について説明する。
電子部品10は、例えば、パッケージ基板、メイン基板、インターポーザといった各種基板である。この場合、各基板は、リジット基板でもよいし、フレキシブル基板でもよい。また、電子部品10は、半導体チップや、半導体チップを搭載する半導体パッケージといった各種半導体デバイスであってもよい。
図6は第1の実施の形態に係る電子装置の形成方法の一例を示す図である。図6(A)には、電子部品の配置工程の要部断面模式図を示している。図6(B)には、電子部品の接合工程の要部断面模式図を示している。
まず、図6(A)に示すように、端子11が設けられた電子部品10と、端子21が設けられた電子部品20とが準備される。準備された電子部品10の、端子11が設けられている側の面上に、接着剤30が設けられる。そして、ボンディングツール40が用いられ、電子部品20が、その端子21の、電子部品10の端子11に対する位置合わせが行われて、接着剤30を設けた電子部品10の上方に対向配置される。その際、電子部品20の端子21は、その先端21aの一部である先端部位21aaが端子11の上方に位置し、先端21aの他部である先端部位21abが端子11の外側上方に位置するように、位置合わせが行われる。
尚、電子装置1では、電子部品10と電子部品20とが接着剤30で接着されることによって端子11と端子21との接触が保持される。電子部品10と電子部品20とが接着剤30で接着されない場合には、端子11と端子21との実用上の接触(機械的及び電気的な接合)が保持されない。このような点で、圧接工法で得られる端子11と端子21との接触の状態は、半田接合工法や超音波接合工法等の他工法で得られる、金属拡散や反応(合金化)によって実用上の機械的及び電気的な接合が実現される端子間接合部の状態とは相違する。
図7は第2の実施の形態に係る電子装置の一例を示す図である。図7(A)には、第2の実施の形態に係る電子装置の要部平面模式図を示している。図7(B)には、図7(A)のL7−L7断面模式図を示している。図7(C)には、図7(B)のX7部拡大模式図を示している。
図8は第2の実施の形態に係る電子装置の形成方法の一例を示す図である。図8(A)には、基板及び半導体チップの配置工程の要部断面模式図を示している。図8(B)には、基板及び半導体チップの接合工程の要部断面模式図を示している。
図9(A)には、比較のため、バンプ61の先端61aの全体がパッド51の上面51aに圧接される場合の応力解析モデルの模式図と最大応力値とを示している。図9(B)には、バンプ61の先端61aが、その平面中心を通る断面で見て、外周から直径の50%分、パッド51の上面51aに圧接される場合の応力解析モデルの模式図と最大応力値とを示している。図9(C)には、バンプ61の先端61aが、その平面中心を通る断面で見て、外周から直径の25%分、パッド51の上面51aに圧接される場合の応力解析モデルの模式図と最大応力値とを示している。応力解析は、バンプ61をAuスタッドバンプとし、パッド51をCu/Ni/Auパッドとし、ボンディング荷重を15g/bumpとして、シミュレーションしている。
図10は第3の実施の形態に係る電子装置の一例を示す図である。図10(A)には、第3の実施の形態に係る電子装置の要部平面模式図を示している。図10(B)には、図10(A)のL10−L10断面模式図を示している。図10(C)には、図10(B)のX10部拡大模式図を示している。
図11は第4の実施の形態に係る電子装置の一例を示す図である。図11(A)には、第4の実施の形態に係る電子装置の要部平面模式図を示している。図11(B)には、図11(A)のL11−L11断面模式図を示している。図11(C)には、図11(B)のX11部拡大模式図を示している。
図12は第5の実施の形態に係る電子装置の一例を示す図である。図12(A)には、第5の実施の形態に係る電子装置の要部平面模式図を示している。図12(B)には、図12(A)のL12−L12断面模式図を示している。図12(C)には、図12(B)のX12部拡大模式図を示している。
図13は第6の実施の形態に係る電子装置の一例を示す図である。図13(A)には、第6の実施の形態に係る電子装置の要部断面模式図を示している。図13(B)には、図13(A)のX13部拡大模式図を示している。
図14は第7の実施の形態に係る電子装置の一例を示す図である。図14(A)には、第7の実施の形態に係る電子装置の要部断面模式図を示している。図14(B)には、図14(A)のX14部拡大模式図を示している。
上記第1〜第7の実施の形態で述べたような電子装置1,1A,1B,1C,1D,1E,1F等は、各種電子機器に搭載することができる。例えば、コンピュータ(パーソナルコンピュータ、スーパーコンピュータ、サーバ等)、スマートフォン、携帯電話、タブレット端末、センサ、カメラ、オーディオ機器、測定装置、検査装置、製造装置といった、各種電子機器に搭載することができる。
図15に示すように、例えば上記第2の実施の形態で述べたような電子装置1A(図7)が各種電子機器90に搭載(内蔵)される。
10,20 電子部品
11,21 端子
11a,51a,66a 上面
11b,51b エッジ
21a,54a,61a 先端
21aa,21ab,54aa,54ab,61aa,61ab 先端部位
30,70,300 接着剤
40,80,400 ボンディングツール
50,50F,100 基板
51,55,66,110 パッド
52,120,130 基材
53 保護膜
54,61,67,210 バンプ
60,60E,200 半導体チップ
62,220 電極
63a,63b 辺
64a,64b ずれ
65 コーナー部
90 電子機器
140 凹部
G1 ボンディング荷重
G2 反力
G3 圧縮力
Q1,Q2,Q3 接触部
Claims (8)
- 第1端子を有する第1電子部品と、
前記第1電子部品に対向して設けられ、前記第1端子に接触する第1先端部位と、前記第1端子の外側に位置する第2先端部位とを備える第2端子を有する第2電子部品と、
前記第1電子部品と前記第2電子部品との間に設けられ、前記第1電子部品と前記第2電子部品とを接着することによって前記第1端子と前記第1先端部位との接触を保持する接着剤と
を含むことを特徴とする電子装置。 - 平面視で、前記第1先端部位の面積が、前記第2先端部位の面積と同じか又は前記第2先端部位の面積よりも小さいことを特徴とする請求項1に記載の電子装置。
- 前記第2端子は、前記第2電子部品の第1コーナーの近傍に設けられることを特徴とする請求項1又は2に記載の電子装置。
- 前記第1電子部品は、第3端子を有し、
前記第2電子部品は、前記第3端子に接触する第3先端部位と、前記第3端子の外側に位置する第4先端部位とを備える第4端子を有し、
前記接着剤は、前記第1電子部品と前記第2電子部品とを接着することによって前記第3端子と前記第3先端部位との接触を保持することを特徴とする請求項1乃至3のいずれかに記載の電子装置。 - 前記第2端子は、前記第2電子部品の第1辺に沿った領域に設けられ、
前記第4端子は、前記第2電子部品の、前記第1辺と対向する第2辺に沿った領域に設けられ、
前記第1先端部位から前記第2先端部位に向かう方向と、前記第3先端部位から前記第4先端部位に向かう方向とが、互いに反対であることを特徴とする請求項4に記載の電子装置。 - 前記第4端子は、前記第2電子部品の、前記第1コーナーとは異なる第2コーナーの近傍に設けられることを特徴とする、請求項3を引用する請求項4又は5に記載の電子装置。
- 第1端子を有する第1電子部品と、第2端子を有する第2電子部品とを、前記第2端子の第1先端部位が前記第1端子に接触し、前記第2端子の第2先端部位が前記第1端子の外側に位置するように、対向させる工程と、
前記第1電子部品と前記第2電子部品とを間に設けられた接着剤で接着することによって前記第1端子と前記第1先端部位との接触を保持する工程と
を含むことを特徴とする電子装置の製造方法。 - 第1端子を有する第1電子部品と、
前記第1電子部品に対向して設けられ、前記第1端子に接触する第1先端部位と、前記第1端子の外側に位置する第2先端部位とを備える第2端子を有する第2電子部品と、
前記第1電子部品と前記第2電子部品との間に設けられ、前記第1電子部品と前記第2電子部品とを接着することによって前記第1端子と前記第1先端部位との接触を保持する接着剤と
を含む電子装置を備えることを特徴とする電子機器。
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