JP5601384B2 - 半導体モジュール用放熱板の製造方法、その放熱板およびその放熱板を用いた半導体モジュール - Google Patents
半導体モジュール用放熱板の製造方法、その放熱板およびその放熱板を用いた半導体モジュール Download PDFInfo
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Description
図9の凸状の湾曲67を相殺するように放熱板51の中央が絶縁基板56側で凹状になるように逆の湾曲69を予め形成する(逆反り付けや初期反り付けと言われている)。この逆の湾曲69は半田付けした後でも絶縁基板56側が凸にならないように大き目に形成する。
このように凹状の湾曲86を形成する方法では、曲率が左右で異なる曲率R3,R4の湾曲の接続位置が中心からずれ不明瞭となり、湾曲86の管理が困難になる。
図13(a)に示すように、剛性が大きいリジッドな絶縁基板82の下側に凹状の湾曲87の底部87aが位置するため、剛性が弱い、絶縁基板同士の間の隙間88に応力が集中して図13(b)に示すように半田84にクラック89および絶縁基板を構成するセラミックの割れ(図示せず)が発生し易くなる。また、絶縁基板81,82同士の間で絶縁基板82の端部が持ち上げられて放熱板83と冷却フィン90の間91に隙間が発生じ易くなる。
また、請求の範囲の第5項に記載の発明によれば、第3項に記載の発明において、前記絶縁基板を構成する絶縁板の材質が、アルミナ、窒化アルミニウムまたは窒化ケイ素であるとよい。
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。
この第3の湾曲11を有する放熱板3に異形の絶縁基板1,2を所定の位置で半田付けすると、第2の湾曲7に近い第4の湾曲21(図5参照)を有する放熱板3になる。この放熱板3が半導体モジュールを構成する放熱板となる。
前記したように、本発明では、第3の湾曲11の形状を放熱板3の全体の湾曲から決めているため、特許文献1のように各絶縁基板毎に個別に湾曲を決めてそれらの湾曲を合わせて全体の湾曲が決まる場合に比べて、湾曲11が大きくなり過ぎず、放熱板3を冷却フィンに固定したときに、絶縁基板1,2と放熱板3の間の半田にクラックが発生することを防止できる。
図1(d)ではX方向の湾曲のみを示したが、本実施例では第1実施例の製造方法を面に拡張し、同様の手法で、Y方向の湾曲も測定し図3(a)に示すような二次元の湾曲を得る。この二次元の湾曲の底部11aは第3の湾曲11の底部11aと同じである。ここでは第3の湾曲11を二次元の湾曲にも用いることにする。図中の符号16は第3の湾曲の等高線を示す。
3 放熱板
4 凸状の湾曲
4a 頂点
5 締め付け穴
5a,5b 基準点
6 第1の湾曲
6a,7a,11a,21a 底部
7 第2の湾曲
8 隙間
9,10 直線
11 第3の湾曲
15 裏面
16 等高線
17 凹金型
18 凸金型
19 平板
21 第4の湾曲
25,26 半田
27 半導体チップ
28 ボンディングワイヤ
29 配線導体
30 外部導出端子
31 樹脂ケース
32 ゲル
33 冷却フィン
100 半導体モジュール
Claims (5)
- 複数の異形の絶縁基板を平坦な放熱板に半田付けして、前記絶縁基板側に凸状の湾曲を前記放熱板に形成する工程と、
前記の凸状の湾曲を反転した凹状の第1の湾曲を取得する工程と、
半田付け後の放熱板の凹状の湾曲を設定し、該湾曲の底部が前記の絶縁基板同士の間の隙間に位置し、前記絶縁基板側に凹状となる第2の湾曲を設定する工程と、
前記第1の湾曲と前記第2の湾曲を加算して前記絶縁基板側に凹状の第3の湾曲を算出する工程と、
平板に前記第3の湾曲を形成して半田付け前の放熱板を形成する工程と、
を含むことを特徴とした半導体モジュール用放熱板の製造方法。 - 請求の範囲第1項に記載の半導体モジュール用放熱板の製造方法で製造された半導体モジュール用放熱板において、
前記第3の湾曲の底部が前記異形の絶縁基板の内面積の大きい方の絶縁基板の下側に位置し、前記絶縁基板の内面積の小さい方の絶縁基板の下側に位置する放熱板の曲率が大きい方の絶縁基板の下側に位置する放熱板の曲率より小さいことを特徴とする半導体モジュール用放熱板。 - 請求の範囲第2項に記載の半導体モジュール用放熱板を用いて製造した半導体モジュールにおいて、
該半導体モジュールを構成する放熱板の湾曲が、前記絶縁基板側に凹状の湾曲になり、該凹状の湾曲の底部が前記絶縁基板同士の間の隙間に位置することを特徴とする半導体モジュール。 - 前記放熱板の材質が、銅または銅合金であることを特徴とする請求の範囲第2項記載の半導体モジュール用放熱板。
- 前記絶縁基板を構成する絶縁板の材質が、アルミナ、窒化アルミニウムまたは窒化ケイ素であることを特徴とする請求の範囲第3項記載の半導体モジュール。
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PCT/JP2011/070035 WO2012108073A1 (ja) | 2011-02-08 | 2011-09-02 | 半導体モジュール用放熱板の製造方法、その放熱板およびその放熱板を用いた半導体モジュール |
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CN103339723B (zh) * | 2011-02-08 | 2016-03-09 | 富士电机株式会社 | 半导体模块用散热板的制造方法、该散热板以及使用该散热板的半导体模块 |
JP2018195717A (ja) * | 2017-05-17 | 2018-12-06 | 富士電機株式会社 | 半導体モジュール、半導体モジュールのベース板および半導体装置の製造方法 |
JP2019054069A (ja) * | 2017-09-14 | 2019-04-04 | 株式会社東芝 | 半導体装置 |
JP7086109B2 (ja) * | 2018-01-10 | 2022-06-17 | 住友電気工業株式会社 | 複合部材、放熱部材、半導体装置、及び複合部材の製造方法 |
US10679920B2 (en) * | 2018-01-22 | 2020-06-09 | Panasonic Intellectual Property Management Co., Ltd. | Semiconductor device having semiconductor package in a wiring board opening |
CN111211059B (zh) * | 2018-11-22 | 2023-07-04 | 矽品精密工业股份有限公司 | 电子封装件及其制法与散热件 |
DE112020007724T5 (de) * | 2020-10-23 | 2023-08-10 | Mitsubishi Electric Corporation | Halbleitervorrichtung und Verfahren zur Fertigung der Halbleitervorrichtung |
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Publication number | Publication date |
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US20130306296A1 (en) | 2013-11-21 |
WO2012108073A1 (ja) | 2012-08-16 |
EP2674971A4 (en) | 2017-12-27 |
CN103339723A (zh) | 2013-10-02 |
EP2674971A1 (en) | 2013-12-18 |
US10262874B2 (en) | 2019-04-16 |
US20170011935A1 (en) | 2017-01-12 |
CN103339723B (zh) | 2016-03-09 |
JPWO2012108073A1 (ja) | 2014-07-03 |
EP2674971B1 (en) | 2021-04-07 |
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