JPWO2018038113A1 - ワイヤボンディング方法及びワイヤボンディング装置 - Google Patents
ワイヤボンディング方法及びワイヤボンディング装置 Download PDFInfo
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Abstract
Description
図1は、本実施形態に係るワイヤボンディング装置を示した図であり、図2は、ワイヤボンディング装置におけるボンディングアームの一部拡大図であり、図2(A)は、ボンディングアームの頂面図、図2(B)は、ボンディングアームの底面図である。
図3(A)に示すように、ボンディングツール40をこれからボンディングしようとする第1ボンディング対象としての電極112の上方の位置P1に配置する。
図3(A)に示すように、ボンディングツール40を電極112の第1ボンディング点P2に向かって下降させる。例えば、図6に示すように、t0〜t1の間においてボンディングツール40をZ方向に沿って速度aで下降させる。
図5(B)及び図6に示すように、時刻t2において、フリーエアーボール43が電極112に接触する。その後、フリーエアーボール43が第1ボンディング点P2を押圧する場合、フリーエアーボール43は、第1ボンディング点P2から反力を受け、ボンディングツール40の下降速度が速度bから速度c(速度cは、速度bよりも小さい)に減少する。
図5に示すように、高さ測定部88は、フリーエアーボール43が電極112に接地したか否かを検出することによって電極112の高さを測定する。高さ測定部88は、例えば、予め設定されているボンディングツール40の下降前の位置P1の高さと、フリーエアーボール43が電極112に接地した場合のボンディングツール40の位置Z2に対応する高さHと、に基づいて、電極112の高さを測定する。なお、位置P1の高さ、及び、高さHのそれぞれは、ワーク100のボンディングステージ16、半導体チップ110、又は半導体チップ120の表面からの高さを含んでもよい。
図3(A)及び図6に示すように、ボンディングツール40を、所定の速度で第1ボンディング点P2の上方の位置P1に移動させる。そして、図4において不図示であるが、図3(B)及び(C)に示すように、電極122の第2ボンディング点P4の高さを測定する高さ測定処理に進む。
第2実施形態は、高さ測定部88が、電極112、122にフリーエアーボールが接地したときに印加されるボンディング荷重の変化に基づいて、ワイヤの先端のフリーエアーボールが電極112、122に接地したか否かを検出する点で第1実施形態とは異なる。以下では、第1実施形態と異なる点について特に説明し、その他は省略する。
図8に示すように、図1に示す高さ測定部88は、荷重センサ50の出力の変化に基づいて、ワイヤ42の先端のフリーエアーボール43が電極112に接地したか否かを検出する。具体的に、高さ測定部88は、ワイヤ42の先端のフリーエアーボール43が第1ボンディング点P2を押圧したときのフリーエアーボール43に加わるボンディング荷重の変化に基づいて、ワイヤ42の先端のフリーエアーボール43が電極112に接地したか否かを検出する。
図1に示す高さ測定部88は、フリーエアーボール43が電極112に接地したか否かを検出することによって、第1ボンドレベル検出位置に対応するボンディングツール40のZ方向の位置に基づく電極112の高さを測定する。なお、図7において不図示だが、高さ測定部88は、電極112の高さを測定した後、フリーエアーボール43が電極122に接地したか否かを検出することによって、第2ボンドレベル検出位置に対応するボンディングツール40のZ方向の位置に基づく電極122の高さを測定する。
第3実施形態は、高さ測定部88が、電極112、122にフリーエアーボールが接地したときにボンディングツールに挿通されるワイヤに供給された電気信号の出力の変化に基づいて、ワイヤの先端のフリーエアーボールが電極112、122に接地したか否かを検出する点で、第1及び第2実施形態と異なる。以下では、第1及び第2実施形態と異なる点について特に説明し、その他は、省略する。
図8に示すように、高さ測定部88は、図1に示す接地検出部150の検出電圧に基づいて、ワイヤ42の先端のフリーエアーボール43が電極112に接地したか否かを検出する。具体的に、高さ測定部88は、ワイヤ42の先端のフリーエアーボール43が電極112の第1ボンディング点P2に接触したときの、ボンディングツール40に挿通されるワイヤ42に供給された電気信号の出力の変化に基づいて、ワイヤ42の先端のフリーエアーボール43が電極112に接地したか否かを検出する。
高さ測定部88は、フリーエアーボール43が電極112に接地したか否かを検出することによって第1ボンドレベル検出位置に対応する電極112の高さを測定する。なお、図11において不図示だが、高さ測定部88は、電極112の高さを測定した後、フリーエアーボール43が電極122に接地したか否かを検出することによって、第2ボンドレベル検出位置に対応するボンディングツール40のZ方向の位置に基づく電極122の高さを測定する。
上記発明の実施形態を通じて説明された実施例や応用例は、用途に応じて適宜に組み合わせて、又は変更若しくは改良を加えて用いることができ、本発明は上述した実施形態の記載に限定されるものではない。そのような組み合わせ又は変更若しくは改良を加えた形態も本発明の技術的範囲に含まれ得ることが、特許請求の範囲の記載から明らかである。
Claims (8)
- ワイヤを挿通するよう構成されたボンディングツールと、
第1の電極及び第2の電極を含むワークを固定して保持するボンディングステージと、
を備えるワイヤボンディング装置を準備する工程と、
前記ボンディングツールに挿通されたワイヤの先端にフリーエアーボールを形成するボール形成工程と、
前記フリーエアーボールが前記第1の電極に接地したか否かを検出することによって前記第1の電極の高さを測定する第1高さ測定工程と、
前記フリーエアーボールが前記第2の電極に接地したか否かを検出することによって前記第2の電極の高さを測定する第2高さ測定工程と、
前記第1高さ測定工程の測定結果に基づいて前記ボンディングツールの高さを制御し、当該フリーエアーボールを前記第1の電極に接合する第1接合工程と、
前記第2高さ測定工程の測定結果に基づいて前記ボンディングツールの高さを制御し、前記ワイヤを前記第2の電極に接合して前記第1の電極と第2の電極とを接続する第2接合工程と、
を含む、ワイヤボンディング方法。 - 前記第1及び第2高さ測定工程は、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極のそれぞれを押圧したときの前記フリーエアーボールに加わるボンディング荷重の変化に基づいて、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極のそれぞれに接地したか否かを検出することを含む、
請求項1に記載のワイヤボンディング方法。 - 前記第1及び第2高さ測定工程は、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極のそれぞれに接触したときの、前記ボンディングツールに挿通される前記ワイヤに供給された電気信号の出力の変化に基づいて、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極のそれぞれに接地したか否かを検出することを含む、
請求項1又は2に記載のワイヤボンディング方法。 - 前記所定の電気信号は直流電圧信号又は交流電圧信号であり、
前記第1及び第2高さ測定工程は、前記ワイヤと前記第1及び第2の電極のそれぞれとの間の電位差の変化に基づいて、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極に接地したか否かを検出することを含む、
請求項3に記載のワイヤボンディング方法。 - ワイヤを挿通するよう構成されたボンディングツールと、
第1の電極及び第2の電極を含むワークを固定して保持するボンディングステージと、
前記フリーエアーボールが前記第1の電極に接地したか否かを検出することによって前記第1の電極の高さを測定する第1の高さ測定手段と、
前記フリーエアーボールが前記第2の電極に接地したか否かを検出することによって前記第2の電極の高さを測定する第2の高さ測定手段と、
前記第1高さ測定工程の測定結果に基づいて前記ボンディングツールの高さを制御し、当該フリーエアーボールを前記第1の電極に接合する第1の接合手段と、
前記第2高さ測定工程の測定結果に基づいて前記ボンディングツールの高さを制御し、前記ワイヤを前記第2の電極に接合して前記第1の電極と第2の電極とを接続する第2の接合手段とを備える、
ワイヤボンディング装置。 - 前記第1及び第2の高さ測定部は、前記フリーエアーボールが前記第1又は第2の電極を押圧したときの前記フリーエアーボールに加わるボンディング荷重の変化に基づいて、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極のそれぞれに接地したか否かを検出する、
請求項5に記載のワイヤボンディング装置。 - 前記第1及び第2の高さ測定部は、前記フリーエアーボールが前記第1又は第2の電極に接触したときの、前記ボンディングツールに挿通される前記ワイヤに供給された電気信号の出力の変化に基づいて、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極のそれぞれに接地したか否かを検出する、
請求項6又は7に記載のワイヤボンディング装置。 - 前記所定の電気信号は交流電圧信号であり、
前記高さ測定部は、前記ワイヤと前記第1及び第2ボンディング対象のそれぞれとの間の電位差の変化に基づいて、前記ワイヤの先端の前記フリーエアーボールが前記第1及び第2の電極に接地したか否かを検出する、
請求項7に記載のワイヤボンディング装置。
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