JP5633581B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP5633581B2 JP5633581B2 JP2012551794A JP2012551794A JP5633581B2 JP 5633581 B2 JP5633581 B2 JP 5633581B2 JP 2012551794 A JP2012551794 A JP 2012551794A JP 2012551794 A JP2012551794 A JP 2012551794A JP 5633581 B2 JP5633581 B2 JP 5633581B2
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Description
下側リードフレーム60と上側リードフレーム61を固着するレーザ溶接は、レーザ出射ユニット63から出射されるレーザ光64を上側リードフレーム61に照射し、上側、下側のリードフレーム60,61を溶融させ、固化することで行われる。
また、レーザ光64の固着部65(レーザ溶接箇所)の特定は、レーザ出射ユニット63内にセットされた図示しないカメラと光源およびレーザ出射ユニット63外にセットされる図示しないモニタテレビで行われる。光源から可視光を出射し、照射面からの反射光をレーザ出射ユニット63内にセットされたカメラで捕捉し、そのカメラからの信号をモニタテレビに伝送し、モニタテレビに映し出しされた映像で照射箇所を特定する。この可視光の光軸はレーザ光の光軸67に一致させているので、可視光の照射も照射面の垂直線66に対して角度θ=10°〜15°程度傾けて行われる。
また、特許文献3には、レーザ溶接において、バラツキを少なくするとの課題に対し、リードフレームを粗面化する半導体装置の製造方法が記載されている。
前記の特許文献1〜3では、配置される複数のリードフレームの圧延目の方向(圧延方向)を揃えてレーザ溶接することは示唆されていない。
また、請求項5に記載の発明によれば、可視光を上側リードフレームのレーザ溶接予定箇所に照射し、前記レーザ溶接予定箇所からの反射光をカメラで捕らえ、前記カメラの画像をモニタテレビに映し出して前記レーザ溶接予定箇所を特定し、前記レーザ溶接予定箇所にレーザ光を照射して導体部材と前記上側リードフレームとをレーザ溶接する半導体装置の製造方法において、圧延加工で形成された圧延目の方向を全ての前記上側リードフレームで揃え、前記可視光の出射光軸を前記レーザ光の光軸に一致させ、前記レーザ光の光軸を前記上側リードフレームの表面に垂直な垂直線に対して傾け、前記レーザ光の光軸を前記上側リードフレームの表面に投影した投影軸に対して、前記圧延目の方向を直角にする半導体装置の製造方法とする。
本発明の上記および他の目的、特徴および利点は本発明の例として好ましい実施の形態を表す添付の図面と関連した以下の説明により明らかになるであろう。
図6において、上側リードフレーム11を圧延加工された銅板21から切り出す。このとき、半導体装置100(パワー半導体モジュール)で配置される箇所を予測して、全ての上側リードフレーム11(ここではA部の箇所を示す)の圧延目19の方向D(圧延方向)が同じになるように切り出す。
つぎに、図9において、レーザ出射ユニット13内の光源から可視光を上側リードフレーム11に照射し、照射面からの反射光28をカメラ25で捉え、その信号をモニタテレビ26に伝送してモニタテレビ26の画像からレーザ溶接する固着部15a(レーザ溶接箇所)を特定する。前記したように、可視光の上側リードフレーム11上の投影軸18aに対して圧延目19の方向Dを直角にする。
2,7,9 半田
3 導電膜(導電箔)
4 絶縁基板
5 導電パターン
6 導電パターン付絶縁基板
8 半導体チップ
10 下側リードフレーム
11 上側リードフレーム
12 樹脂ケース
12a シリコーン接着剤
13 レーザ出射ユニット
14 レーザ光
15,15a 固着部
16,16a 垂直線
17 レーザ光の光軸
17a 可視光の光軸
18 レーザ光の投影軸
18a 可視光の投影軸
19 圧延目
25 カメラ
26 モニタテレビ
27 出射光(可視光)
28 反射光(可視光)
D 圧延目の方向(圧延方向と同じ)
Claims (5)
- 放熱ベースと、前記放熱ベース上に半田を介して固着した導電パターン付絶縁基板と、前記導電パターン付絶縁基板の導電パターンに半田を介して固着した半導体チップと、前記半導体チップ上に半田を介して固着した導体部材と、前記放熱ベースに接着剤で固着した樹脂ケースと、前記導体部材とレーザ溶接で固着した上側リードフレームとを有する半導体装置において、
全ての前記上側リードフレームが圧延加工で形成され、その表面に圧延方向に筋状に形成される圧延目を有し、前記圧延目の方向を揃えて前記導体部材上に配置されていることを特徴とする半導体装置。 - 前記レーザ溶接時のレーザ光の光軸を前記上側リードフレームの表面に垂直な垂直線に対して傾け、前記光軸を前記上側リードフレームの表面に投影した投影軸に対して、前記圧延目の方向を直角にすることを特徴とする請求項1に記載の半導体装置。
- 前記導体部材が、下側リードフレームであることを特徴とする請求項1に記載の半導体装置。
- 前記導体部材が、ヒートスプレッダもしくは前記導電パターンであることを特徴とする請求項1に記載の半導体装置。
- 可視光を上側リードフレームのレーザ溶接予定箇所に照射し、前記レーザ溶接予定箇所からの反射光をカメラで捕らえ、前記カメラの画像をモニタテレビに映し出して前記レーザ溶接予定箇所を特定し、前記レーザ溶接予定箇所にレーザ光を照射して導体部材と前記上側リードフレームとをレーザ溶接する半導体装置の製造方法において、
圧延加工で形成された圧延目の方向を全ての前記上側リードフレームで揃え、前記可視光の出射光軸を前記レーザ光の光軸に一致させ、前記レーザ光の光軸を前記上側リードフレームの表面に垂直な垂直線に対して傾け、前記レーザ光の光軸を前記上側リードフレームの表面に投影した投影軸に対して、前記圧延目の方向を直角にすることを特徴とする半導体装置の製造方法。
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