JP7239342B2 - 電子装置及び電子装置の製造方法 - Google Patents
電子装置及び電子装置の製造方法 Download PDFInfo
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- JP7239342B2 JP7239342B2 JP2019022447A JP2019022447A JP7239342B2 JP 7239342 B2 JP7239342 B2 JP 7239342B2 JP 2019022447 A JP2019022447 A JP 2019022447A JP 2019022447 A JP2019022447 A JP 2019022447A JP 7239342 B2 JP7239342 B2 JP 7239342B2
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- metal plate
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Description
なお、添付図面は、便宜上、特徴を分かりやすくするために特徴となる部分を拡大して示している場合があり、各構成要素の寸法比率などが各図面で同じであるとは限らない。また、断面図では、各部材の断面構造を分かりやすくするために、一部の部材のハッチングを梨地模様に代えて示し、一部の部材のハッチングを省略している。
図1に示すように、電子装置10は、基板20と、基板20に実装された1つ又は複数の電子部品100とを有している。基板20は、金属板30と、金属板30の下面に接合された金属板40と、金属板40の下面に接合された金属板50と、金属板30の下面に実装された1つ又は複数(ここでは、1つ)の電子部品60と、金属板30,40,50間に形成され、電子部品60を被覆する絶縁層70とを有している。すなわち、基板20は、電子部品60を内蔵した基板である。
図2及び図3に示すように、金属板30は、複数の配線31と、複数の配線34と、複数の給電層35とを有している。これら複数の配線31と複数の配線34と複数の給電層35とは、例えば、同一平面上に形成されている。金属板30には、その金属板30を厚さ方向に貫通して、複数の配線31と複数の配線34と複数の給電層35とを画定する開口部30Xが形成されている。なお、図2は、金属板30及び絶縁層70を下方から視た平面図であり、図3は、金属板30及び絶縁層70を上方から視た平面図である。
図1に示すように、電子部品60は、金属板30の下面に実装されている。電子部品60は、例えば、配線34と平面視で重なるように、配線31の本体部32の下面に実装されている。電子部品60としては、例えば、半導体チップ、トランジスタやダイオードなどの能動部品や、チップコンデンサ、チップインダクタやチップ抵抗などの受動部品を用いることができる。電子部品60としては、例えば、シリコン製の部品やセラミック製の部品を用いることができる。本実施形態の電子部品60は半導体チップである。半導体チップとしては、例えば、CPU(Central Processing Unit)チップやGPU(Graphics Processing Unit)チップなどのロジックチップを用いることができる。また、半導体チップとしては、例えば、DRAM(Dynamic Random Access Memory)チップ、SRAM(Static Random Access Memory)チップやフラッシュメモリチップなどのメモリチップを用いることができる。
金属板40の上面は、金属板30の下面に接合されている。金属板40の上面は、例えば、導電性を有する接合材80を介して金属板30の下面に接合されている。接合材80としては、例えば、はんだ、銀ペースト等の導電性ペーストや金属ろう材を用いることができる。はんだとしては、例えば、鉛(Pd)フリーはんだを用いることができる。鉛フリーはんだとしては、例えば、Sn-Ag系、Sn-Cu系、Sn-Ag-Cu系、Sn-Zn(亜鉛)-Bi(ビスマス)系のはんだを用いることができる。
突出部43の電子装置10外周縁側の外側面43A(つまり、突出部43の先端面)は、絶縁層70の外側面70Aから露出されている。突出部43の外側面43Aは、例えば、絶縁層70の外側面70A及び突出部33の外側面33Aと略面一に形成されている。このとき、絶縁層70から露出される突出部43の外側面43Aは、本体部42の側面42Aよりも面積が小さく形成されている。すなわち、本実施形態では、突出部43の幅寸法を本体部42の幅寸法よりも短く設定し、突出部43を本体部42よりも薄く形成することで、絶縁層70から露出される外側面43Aの面積が本体部42の側面42Aの面積よりも小さくなっている。
図1に示すように、金属板50の上面は、金属板40の下面に接合されている。金属板50の上面は、例えば、導電性を有する接合材81を介して金属板40の下面に接合されている。接合材81としては、例えば、はんだ、銀ペースト等の導電性ペーストや金属ろう材を用いることができる。はんだとしては、例えば、鉛フリーはんだを用いることができる。鉛フリーはんだとしては、例えば、Sn-Ag系、Sn-Cu系、Sn-Ag-Cu系、Sn-Zn-Bi系のはんだを用いることができる。
絶縁層70から露出された電極51の外側面51A及び下面51Bには、金属層92が形成されている。金属層92は、例えば、電極51の外側面51A全面及び下面51B全面を被覆するように形成されている。金属層92は、例えば、電極51の外側面51Aと下面51Bとを連続して被覆するように形成されている。金属層92の側面は、例えば、絶縁層70の外側面70Aよりも基板20内周側に後退した位置に形成されている。金属層92の例としては、Au層、Ni層/Au層、Ni層/Pd層/Au層、Ni層/Ag層を挙げることができる。なお、金属層92の代わりに、例えば、電極51の外側面51A及び下面51Bに、OSP処理などの酸化防止処理を施して形成されるOSP膜を形成するようにしてもよい。OSP膜としては、アゾール化合物やイミダゾール化合物等の有機被膜を用いることができる。
電子装置10は、例えば、マザーボード等の実装用の基板200に実装される。ここで、基板200の上面には、複数の配線層201と金属層202とが形成されている。電子装置10は、電極51がはんだ層211によって配線層201に接合され、放熱板52がはんだ層212によって金属層202に接合されている。例えば、電極51の外側面51A及び下面51Bに形成された金属層92は、はんだ層211により配線層201に接合されている。このとき、金属層92が、電極51の下面51Bだけではなく、電極51の外側面51Aにも形成されている。すなわち、金属層92が立体的に形成されている。これにより、金属層92とはんだ層211とが立体的に接合されるため、好適なフィレットを有するはんだ層211が形成される。このようなはんだ層211は、接合強度が高い。したがって、電極51の下面51Bのみに金属層92が形成される場合に比べて、電極51(金属層92)と配線層201との接続信頼性を向上させることができる。なお、放熱板52の下面に形成された金属層92は、はんだ層212により金属層202に接合されている。
まず、図7(a)に示す工程では、大判の金属板30Aを準備する。金属板30Aは、例えば、金属板30が形成される個別領域A1がマトリクス状(ここでは、2×2)に複数個連設されている。なお、図7(a)に示した例では、金属板30Aが4個の個別領域A1を有するが、個別領域A1の数は特に制限されない。以下では、説明の簡略化のために、1つの個別領域A1に着目して説明を行う。
次に、図8(b)に示す工程では、金属板30Aの上面に開口パターン120X,120Yを有するレジスト層120を形成するとともに、金属板30Aの下面に開口パターン121Xを有するレジスト層121を形成する。開口パターン120X,121Xは、開口部30X(図1参照)の形成領域に対応する部分の金属板30Aの上面及び下面をそれぞれ露出するように形成される。開口パターン120Yは、凹部30Y(図7(b)参照)の形成領域に対応する部分の金属板30Aの上面を露出するように形成される。
次いで、ダイシングソー等により、図中の一点鎖線で示す切断位置における絶縁層70、セクションバー36,46及び接合材80を切断し、個別の電子装置10に個片化される。このとき、本例の切断位置は、各個別領域A1,A2において、電極51の外側面51Aを被覆する金属層92の側面よりも外側の位置に設定されている。これにより、ダイシングソー等によって金属層92の表面が損傷することを好適に抑制できる。また、本工程により、図17(b)に示すように、切断面である、突出部33の外側面33Aと突出部43の外側面43Aと絶縁層70の外側面70Aとが略面一に形成される。
(1)配線34と平面視で重なるように配線31の下面に実装された電子部品60と、配線31の下面と電気的に接続される電極51を有する金属板50と、配線31,34を有する金属板30と金属板50と電子部品60との間を充填する絶縁層70とを設けた。また、配線34の上面を絶縁層70から露出させるようにした。この構成によれば、電子部品60と平面視で重なる配線34の上面に、電子部品60とは別の電子部品100を実装することができる。これにより、金属板30の上下に複数の電子部品60,100を実装することができる。このため、リードフレーム上に複数の電子部品を横並びに実装する従来の電子装置に比べて、電子装置10の平面形状を小型化することができる。
(7)また、放熱板52を設けたことにより、電子部品60の上下両面に金属板30,50を配置することができる。このため、電子装置10を反りに強い構造とすることができる。したがって、電子装置10に反りが発生することを好適に抑制できる。
上記実施形態は、以下のように変更して実施することができる。上記実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
・図19に示すように、金属板50から放熱板52(図1参照)を省略してもよい。この場合には、金属板30の給電層35(図2参照)と金属板40の給電層45(図4参照)と金属板50の給電層55(図5参照)を省略することができる。
・上記実施形態における電子部品60,100の実装の形態は、様々に変形・変更することが可能である。電子部品60,100の実装の形態としては、例えば、フリップチップ実装、ワイヤボンディング実装、はんだ実装又はこれらを組み合わせた形態が挙げられる。
20 基板
20X 段差部
30 金属板(第1金属板)
31 配線(第1配線)
32 本体部
32A 側面(一側面)
33 突出部
33A 外側面
34 配線(第2配線)
40 金属板(第3金属板)
41 配線(中継端子)
50 金属板(第2金属板)
51 電極
52 放熱板
60 電子部品
70 絶縁層
90,91,92 金属層
100,101,102 電子部品
Claims (10)
- 第1配線及び第2配線を有する第1金属板と、
前記第2配線と平面視で重なるように、前記第1配線の下面に実装された電子部品と、
前記第1配線の下面と電気的に接続された電極を有する第2金属板と、
前記第1金属板と前記第2金属板と前記電子部品との間を充填し、前記電子部品を被覆する絶縁層と、を有し、
前記第2配線は、前記第1配線よりも前記絶縁層の内周側に設けられており、
前記第2配線の上面は、前記絶縁層から露出されている電子装置。 - 前記第1配線の下面に接合された中継端子を有する第3金属板を更に有し、
前記電極は、前記中継端子の下面に接合されている請求項1に記載の電子装置。 - 前記電極の側面のうち前記電子装置の外周縁側に位置する外側面と前記電極の下面とは、前記絶縁層から露出されており、
前記電極の前記外側面と前記電極の下面とを連続して被覆する金属層を更に有する請求項1又は2に記載の電子装置。 - 前記電極の前記外側面は、前記絶縁層の外側面よりも前記電子装置の内周側に後退した位置に形成されており、
前記電極の前記外側面と前記絶縁層の外側面とによって段差部が形成されている請求項3に記載の電子装置。 - 前記第2金属板は、前記電極と離間して形成され、前記電子部品と熱的に接続される放熱板を更に有する請求項1~4のいずれか一項に記載の電子装置。
- 前記放熱板の下面は、前記絶縁層から露出されており、
前記放熱板の下面を被覆する金属層を更に有する請求項5に記載の電子装置。 - 前記第1配線は、本体部と、前記本体部の一側面から前記電子装置の外周縁側に向かって突出する突出部とを有し、
前記突出部は、前記本体部よりも幅寸法が短く形成され、且つ前記本体部よりも薄く形成されており、
前記突出部の側面のうち前記電子装置の外周縁側に位置する外側面が前記絶縁層の外側面から露出されている請求項1~6のいずれか一項に記載の電子装置。 - 前記第2配線の上面を被覆する金属層と、
前記第2配線の上面に形成された前記金属層に実装された電子部品と、を更に有する請求項1~7のいずれか一項に記載の電子装置。 - 金属板をプレス加工又はエッチング加工し、第1配線及び第2配線を有する第1金属板を形成する工程と、
金属板をプレス加工又はエッチング加工し、電極を有する第2金属板を形成する工程と、
金属板をプレス加工又はエッチング加工し、中継端子を有する第3金属板を形成する工程と、
前記第2配線と平面視で重なるように、前記第1配線の下面に電子部品を実装する工程と、
前記第1配線の下面に前記中継端子を接合し、前記第1金属板の下面に前記第3金属板を積層する工程と、
前記中継端子の下面に前記電極を接合し、前記第3金属板の下面に前記第2金属板を積層する工程と、
前記第1金属板と前記第2金属板と前記第3金属板と前記電子部品との間を充填し、前記電子部品を被覆するとともに、前記第2配線の上面を露出する絶縁層を形成する工程と、を有し、
前記第2配線は、前記第1配線よりも前記絶縁層の内周側に設けられる電子装置の製造方法。 - 金属板をプレス加工又はエッチング加工し、第1配線及び第2配線を有する第1金属板を形成する工程と、
金属板をプレス加工又はエッチング加工し、電極を有する第2金属板を形成する工程と、
前記第2配線と平面視で重なるように、前記第1配線の下面に電子部品を実装する工程と、
前記第1配線の下面に前記電極を接合し、前記第1金属板の下面に前記第2金属板を積層する工程と、
前記第1金属板と前記第2金属板と前記電子部品との間を充填し、前記電子部品を被覆するとともに、前記第2配線の上面を露出する絶縁層を形成する工程と、を有し、
前記第2配線は、前記第1配線よりも前記絶縁層の内周側に設けられる電子装置の製造方法。
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