JP4991893B2 - 微小径ワイヤボンディングの良否判定方法及び判定装置 - Google Patents
微小径ワイヤボンディングの良否判定方法及び判定装置 Download PDFInfo
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Description
この工程は、接合部32を温度変化が見られなくなる飽和温度に達するまで、同一パワーで連続加熱する工程である。この実施の形態における接合部32の加熱は、補正演算判定手段4からの指令に基づく、加熱用レーザー1によるレーザー照射により行われる。照射された所定波長のレーザーは、集光レンズ11によりスポット径がワイヤ径以下の、例えばΦ20μmとなるように集光されて、接合部32の表面に照射される。
この工程は、接合部32の被加熱部に温度変化がみられなくなる飽和温度に達するまでの温度変移を、2波長放射温度計2によって測定する工程である。上述したようにこの2波長放射温度計2は、接合部32から放射される赤外線の測定を特定の2波長についてのみ行うもので、その特定の2波長についての赤外線量の比率を求め、その比率に対応する温度を接合部32表面の被加熱部の温度として出力する。
この工程では、接合部32の被加熱部において測定した温度変移を、基準となる加熱パワーでの温度変移に補正する。即ち、2波長放射温度計2により得られた温度変移を、熱容量の関係式に基づき、基準となる加熱パワーでの温度変移に補正する。このように補正することで、接合部32におけるレーザー加熱時の吸収率の影響に起因する加熱パワーの差を無視することが可能となるのである。
この工程では、補正後の温度変移と、同様に基準となる加熱パワーでの温度変移に補正した基準となる良品が示す温度変移が比較選別され、その比較選別結果により、接合部32におけるボンディング状態の良否が判定される。この良否の判定は、接合部32における温度変移の相違が、接合部32における接合面積の相違に強い相関があるとの知見に基づいて行うものである。
2 2波長赤外放射温度計
3 測定ヘッド部
4 補正演算判定手段
5 ステージ
11 集光レンズ
12 ダイクロイックフィルター
13 集光レンズ
14 温度変移補正手段
15 メモリ
16 良否判定手段
31 微小径ワイヤ
32 ボンディング部
32a 接合部
Claims (9)
- 微小径ワイヤボンディングの良否を、その接合部の接合面積から判定する方法であって、
微小スポット径のレーザーで微小径ワイヤを加熱する加熱工程と、前記微小径ワイヤの接合部における被加熱部より放射される微少量の赤外線から、放射率を補正して高速に温度変移測定を行う温度測定工程と、前記温度測定工程における測定結果をレーザーの吸収率に関して補正する補正工程と、前記補正工程において補正された測定温度を基に、その補正後の温度変移ないしその温度変移から得られる接合面積と相関のある数値と、レーザーの吸収率に関して補正した基準となる良品が示す温度変移ないしその温度変移から得られた接合面積と相関のある数値とを比較選別することによりボンディングの良否を判定する良否判定工程とから成り、
前記温度測定工程における温度測定は、前記被加熱部に温度変化が見られなくなる飽和温度に達するまでの温度変移を測定するものであり、前記補正工程における補正は、前記温度測定工程において測定した温度変移を、レーザーの吸収率に関して補正する目的の基準となる加熱パワーでの温度変移に補正するものであり、前記良否判定工程における良否判定は、前記補正工程における補正後の温度変移ないしその温度変移から得られる接合面積と相関のある数値と、基準となる加熱パワーでの温度変移に補正した基準となる良品が示す温度変移ないしその温度変移から得られる接合面積と相関のある数値とを比較選別することにより行うものであることを特徴とする微小径ワイヤボンディングの良否判定方法。 - 前記加熱工程における加熱は、スポット径がワイヤ径以下の加熱用レーザーによって行う、請求項1に記載の微小径ワイヤボンディングの良否判定方法。
- 前記温度測定工程における温度変移の測定は、2波長放射温度計により行う、請求項1に記載の微小径ワイヤボンディングの良否判定方法。
- 画像処理による外観検査を併用する、請求項1乃至3のいずれかに記載の微小径ワイヤボンディングの良否判定方法。
- 微小径ワイヤボンディングの良否を、その接合部の接合面積から判定する装置であって、
前記微小径ワイヤの接合部をスポット的に加熱する加熱用レーザーと、前記微小径ワイヤの被加熱部より放射される微少量の赤外線から、放射率を補正して高速に温度測定を行う2波長赤外放射温度計と、前記2波長赤外放射温度計による測定結果を基準となる加熱パワーにおける温度変移に補正した後、前記補正後の温度変移ないしその温度変移から得られる接合面積と相関のある数値と、基準となる加熱パワーでの温度変移に補正した基準となる良品が示す温度変移ないしその温度変移から得られる接合面積と相関のある数値とを比較することにより行うボンディングの良否を判定する補正演算判定手段とで構成されることを特徴とする、微小径ワイヤボンディングの良否判定装置。 - 前記加熱用レーザーは、スポット径がワイヤ径以下である、請求項5に記載の微小径ワイヤのボンディングの良否判定装置。
- 前記加熱レーザーや前記2波長赤外放射温度計は、前記微小径ワイヤのウェッジボンド部及びボールボンド部を測定するための首振り機能を有する測定ヘッド部に担持される、請求項5又は6に記載の微小径ワイヤボンディングの良否判定装置。
- 前記微小径ワイヤの接合部を測定位置に位置決めする移動手段を更に含む、請求項5乃至7のいずれかに記載の微小径ワイヤボンディングの良否判定装置。
- 画像処理による外観検査を行う画像処理装置を更に含む、請求項5乃至8のいずれかに記載の微小径ワイヤボンディングの良否判定装置。
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JP2010058873A JP4991893B2 (ja) | 2010-03-16 | 2010-03-16 | 微小径ワイヤボンディングの良否判定方法及び判定装置 |
US13/635,026 US9199337B2 (en) | 2010-03-16 | 2011-03-08 | Method and apparatus for determining acceptance/rejection of fine diameter wire bonding |
PCT/JP2011/055367 WO2011114945A1 (ja) | 2010-03-16 | 2011-03-08 | 微小径ワイヤボンディングの良否判定方法及び判定装置 |
CN201180013960.6A CN102918384B (zh) | 2010-03-16 | 2011-03-08 | 微小直径引线接合的合格与否判定方法及判定装置 |
EP11756134.0A EP2549268B1 (en) | 2010-03-16 | 2011-03-08 | Method and apparatus for determining acceptance/rejection of fine diameter wire bonding |
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EP (1) | EP2549268B1 (ja) |
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JP6010349B2 (ja) * | 2011-06-09 | 2016-10-19 | 株式会社ニデック | 染色方法及び染色装置 |
JP6160200B2 (ja) | 2013-04-18 | 2017-07-12 | 株式会社ジェイテクト | 光学非破壊検査装置及び光学非破壊検査方法 |
JP6123460B2 (ja) | 2013-04-26 | 2017-05-10 | 株式会社ジェイテクト | 光学非破壊検査装置及び光学非破壊検査方法 |
JP6232734B2 (ja) | 2013-04-26 | 2017-11-22 | 株式会社ジェイテクト | 光学非破壊検査装置及び光学非破壊検査方法 |
JP6255713B2 (ja) | 2013-05-14 | 2018-01-10 | 株式会社ジェイテクト | 光学非破壊検査方法及び光学非破壊検査装置 |
JP6241069B2 (ja) * | 2013-05-24 | 2017-12-06 | 株式会社ジェイテクト | 光学非破壊検査方法及び光学非破壊検査装置 |
JP6232760B2 (ja) * | 2013-06-07 | 2017-11-22 | 株式会社ジェイテクト | 光学非破壊検査方法及び光学非破壊検査装置 |
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