JP5107187B2 - 電子部品パッケージの製造方法 - Google Patents
電子部品パッケージの製造方法 Download PDFInfo
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- JP5107187B2 JP5107187B2 JP2008228204A JP2008228204A JP5107187B2 JP 5107187 B2 JP5107187 B2 JP 5107187B2 JP 2008228204 A JP2008228204 A JP 2008228204A JP 2008228204 A JP2008228204 A JP 2008228204A JP 5107187 B2 JP5107187 B2 JP 5107187B2
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- electronic component
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- post
- component package
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- H01L2924/151—Die mounting substrate
- H01L2924/15165—Monolayer substrate
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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Description
かかる要請に応えるべく、下記特許文献1には、搭載された電子部品と同等の厚さの電子部品パッケージの製造方法が提案されている。
この特許文献1に提案された電子部品パッケージの製造方法を図9に示す。図9に示す電子部品パッケージの製造方法では、図9(a)に示す様に、搭載する電子部品と等しい厚さの樹脂板100の所定箇所に貫通孔102を穿設した後、樹脂板100の一面側に樹脂フィルム104を貼着する。
この様に、開口部の一方が樹脂フィルム104で覆われた貫通孔102内に、図9(b)に示す様に、電子部品106を挿入する。この際に、電子部品106の電極端子106a,106a・・は、樹脂フィルム104側となるように挿入する。
挿入した電子部品106と貫通孔102との隙間102aは、図9(c)に示す様に、樹脂108によって充填し、電子部品106を貫通孔102内に固定する。
しかし、図9に示す電子部品パッケージの製造方法によって得られた電子部品パッケージには、樹脂板100が残されている。このため、得られた電子部品パッケージは、その厚さは薄いものの、その面積が大きくなる。
一方、電子部品パッケージが実装される実装装置では、その小型化のため、電子部品パッケージの面積も小面積化が求められている。
そこで、本発明は、厚さを搭載した電子部品と同等にできるものの、面積が大きくなるという従来の電子部品パッケージの製造技術の課題を解決し、厚さ及び面積を共に小型化可能な電子部品パッケージの製造技術を提供することにある。
このため、本発明者等は、支持板で電子部品を支持しつつ電子部品パッケージを形成し、最終的に支持板を除去することによって、支持板を含まない電子部品パッケージを形成できることを知り、本発明に到達した。
この支持板としては、シリコン又はガラスから成る支持板を用いることによって、電子部品を確実に支持できる。更に、支持板として、シリコンから成る支持板を用い、電子部品用凹部とポスト用凹部との各々を、ドライエッチングによって形成できる。
しかも、支持板の一面側に、剥離層を介して電子部品パッケージが形成されており、支持板を電子部品パッケージから剥離できる。このため、支持板をエッチングによって溶解除去する場合に比較して、支持板を電子部品パッケージから簡単に且つ短時間で剥離できる。
この様に、電子部品パッケージの製造工程で必要な支持板を、電子部品パッケージから剥離できるため、得られた電子部品パッケージを薄く且つ小面積に形成できる。
更に、本発明では、電子部品を挿入して位置決めできる大きさの凹部を、支持板に直接に形成する。このため、この凹部内に挿入した電子部品の電極端子は正確に位置決めでき、電極端子と接続される導体パターンの位置ずれを防止できる結果、得られた電子部品パッケージの信頼性を向上できる。
更に、図1(b)に示す様に、凹部12よりも支持板10の周縁側に、深さが凹部12よりも深いポスト用凹部16,16(以下、凹部16と称することがある)を形成する。この凹部16も、支持板10の一面側に貼着したドライフィルム15の所定箇所に支持板10の一面側が露出する開口部を形成した後、サンドブラストによって形成する。
かかる凹部12及び凹部16,16の内壁面を含む支持板10の一面側からドライフィルム15を剥離して、支持板10の一面側の全面に、図1(c)に示す様に、剥離層18を形成する。この剥離層18は、金属製であって、その拡大図に示す様に、支持板10の一面側からチタン又はクロムから成る層18a、錫層18b及銅層18cによって形成されている。かかる剥離層18では、チタン又はクロムから成る層18aと錫層18bとの境界面が剥離され易い。この剥離層18は、スパッタ、蒸着、無電解めっき又は電解めっきによって順次所定の金属層を積層して得ることができる。
尚、剥離層18としては、チタン又はクロムから成る層18aと錫層18bとの間に、銅層を加えた、支持板10の一面側からチタン又はクロムから成る層−銅層−錫層−銅層が順次積層された剥離層であってもよい。
このドライフィルム17を剥離した後、図2(b)に示す様に、凹部12内に半導体素子22を挿入する。この凹部12は、半導体素子22の位置決めを行うことができる大きさで且つ半導体素子22の厚さと等しい深さに形成されている。このため、凹部12に挿入された半導体素子22は正確に位置決めされ、その電極端子22a,22aも正確に位置決めされる。
かかる電極端子22a,22aの各々と所定のポスト20とを接続する導体パターンを形成する。
かかる導体パターンを形成する際には、いわゆるアディティブ法やセミアディティブ法等の公知の方法を採用できる。図2(c)では、支持板10の一面側を覆うように形成した樹脂層24に、ポスト20,20の各々が底面に露出する凹部と、半導体素子22の電極端子22a,22aが底面に露出する凹部を形成した後、無電解銅めっき、蒸着又はスパッタ等によって樹脂層24の一面に薄金属層26を形成する。
この薄金属層26上に貼着したドライフィルム19に、図2(d)に示す様に、パターニングを施した後、薄金属層26を給電層とする電解銅めっきを施して、図2(e)に示す様に、導体パターン28,28を形成する。
更に、図3(a)に示す様に、形成した導体パターン28,28を樹脂層24によって樹脂封止して電子部品パッケージ30を形成する。
この電子部品パッケージ30と支持板10とを、剥離層18によって剥離したとき、図3(b)に示す様に、剥離層18の一部が付着している。このため、電子部品パッケージ30に付着している剥離層18を、エッチングによって除去することによって、図3(c)に示す電子部品パッケージ30を得ることができる。
かかる電子部品パッケージ30では、半導体素子22の電極端子22a,22aの各々と、半導体素子22の厚さよりも厚く形成したポスト20とが、樹脂層24に封止された導体パターン28によって電気的に接続されている。
図3(c)に示す電子部品パッケージ30では、支持板10が残留していないため、半導体素子22として厚さが20μm程度の半導体素子22を用いた場合、樹脂層24の上面からポスト20の下端までの厚さHを100μm程度とすることができ、その面積も小面積化できる。
図3(c)に示す電子部品パッケージ30では、その上面側に何等設けることができないが、図3(a)に示す工程において、図4(a)に示す様に、導体パターン28に一端が接続され且つ他端が樹脂層24の上面側に露出するヴィア32を形成することによって、図4(b)に示す様に、電子部品パッケージ30の上面側に他の電子部品34を装着できる。かかる他の電子部品34としては、半導体素子等の能動部品、キャパシタ等の受動部品を採用できる。
尚、電子部品パッケージ30を剥離した支持板10は、シリコン又はガラスによって形成されているため、再度、支持板10として再利用できる。
先ず、シリコン又はガラスから成る支持板40の一面側に、剥離層42を介して金属から成るシード層44を形成する。この剥離層42は、樹脂から成る剥離層である。この樹脂としては、アクリル系樹脂、ノボラック型フェノール樹脂、HMDS(ヘキサメチルジシラザン)等を好適に用いることができる。また、シード層44は、無電解めっき、スパッタ、電解めっき、蒸着等を組み合わせて形成できる。
このシード層44上には、図5(b)に示す様に、搭載する電子部品としての半導体素子と同一厚さの第1樹脂層46を形成した後、底面にシード層44が露出するポストを形成するポスト用凹部52(以下、凹部52と称することがある)を形成する。更に、シード層44を給電層とする電解銅めっきによって、凹部52内に銅を充填してポスト54を形成する。
次いで、底面にシード層44が露出する半導体素子を挿入する電子部品用凹部50(以下、凹部50と称することがある)を形成する。この凹部50は、挿入された半導体素子の位置決めができるように、その面積も挿入される半導体素子と略同程度で且つ深さも半導体素子の厚さと等しい。このため、図5(b)に示す様に、凹部50に挿入された半導体素子56は正確に位置決めができ、その電極端子56a,56aも正確に位置決めがなされる。
かかる導体パターンを形成する際には、いわゆるアディティブ法やセミアディティブ法等の公知の方法を採用できる。図5(c)では、支持板40の一面側を覆うように形成した第2樹脂層58に、ポスト54,54の各々が底面に露出する凹部と、半導体素子56の電極端子56a,56aが底面に露出する凹部を形成した後、図5(d)に示す様に、無電解銅めっき、スパッタ又は蒸着によって第2樹脂層58の一面に薄金属層60を形成する。
この薄金属層60上に貼着したドライフィルム62に、図6(a)に示す様に、パターニングを施した後、薄金属層60を給電層とする電解銅めっきを施して、図6(a)に示す様に、導体パターン64,64を形成する。
更に、図6(c)に示す様に、形成した導体パターン64,64を第2樹脂層58によって樹脂封止して電子部品パッケージ70を形成する。
この電子部品パッケージ70を、図6(d)に示す様に、支持板40から剥離する。この剥離の際に、剥離層42をアクリル系樹脂によって形成している場合には、180℃以上に加熱して支持板40を剥離でき、剥離層42をノボラック型フェノール樹脂によって形成している場合には、剥離液で剥離できる。
支持板40から電子部品パッケージ70を剥離したとき、図5(d)に示す様に、シード層44が付着している。このため、電子部品パッケージ70に付着しているシード層44を、エッチングによって除去した後、第1樹脂層46を除去することによって、図6(e)に示す電子部品パッケージ70を得ることができる。
かかる電子部品パッケージ70では、半導体素子56の電極端子56a,56aの各々と、半導体素子56の厚さと等しく形成したポスト54とが、樹脂層64に封止された導体パターン64によって電気的に接続されている。
また、図8に示す様に、複数の電子部品パッケージ70,70・・を積層することができる。この場合には、電子部品パッケージ70の各々に、その第2樹脂層58を貫通して、導体パターン64に一端が接続されたヴィア72の他端側に、所定高さのパッド74を形成する。
また、支持板10,40に凹部16,12,50,52を形成する際に、サンドブラストによって形成しているが、ウエットエッチングやドライエッチング或いは機械加工によって形成してもよい。特に、支持板10として、シリコンから成る支持板10を用い、電子部品用凹部12とポスト用凹部16との各々を、SF6ガスやCF4ガス等を用いたドライエッチングによって形成することが好ましい。
更に、支持板10,40に複数の電子部品用凹部12,50を形成し、複数の電子部品が複数の凹部内に挿入された電子部品パッケージを形成してもよい。
尚、ポスト用凹部16,52には、金属を充填しているが、導電性樹脂を充填してもよい。
12,50 電子部品用凹部
14,15,17,19,62 ドライフィルム
16,52 ポスト用凹部
18,42 剥離層
20,54 ポスト
22,56 半導体素子(電子部品)
22a,56a 電極端子
24,46 樹脂層
26,60 薄金属層
28,64 導体パターン
30,70 電子部品パッケージ
32,72 ヴィア
34 電子部品
44 シード層
66,74 パッド
Claims (4)
- 搭載された電子部品の電極端子と外部接続端子としてのポストとが導電パターンによって電気的に接続された電子部品パッケージを製造する際に、
支持板の一面側に、前記電子部品が挿入される電子部品用凹部を形成する工程と、
前記電子部品用凹部よりも周縁側の前記支持板の一面側に、前記ポストが形成されるポスト用凹部を形成する工程と、
前記電子部品用凹部および前記ポスト用凹部の内壁面を含む前記支持板の一面側の全面に剥離層を形成する工程と、
前記剥離層を介して前記ポスト用凹部に導電材を充填して前記ポストを形成する工程と、
前記剥離層を介して前記電子部品用凹部に前記電極端子が形成された面と反対側の背面から前記電子部品を挿入する工程と、
前記支持板の一面側において、前記剥離層、前記ポスト、および前記電子部品を覆うように樹脂層を形成する工程と、
前記樹脂層に、前記電極端子および前記ポストが底面に露出する各凹部を形成する工程と、
前記電極端子と前記ポストとを前記各凹部を通じて電気的に接続する導体パターンを前記樹脂層上に形成する工程と、
前記樹脂層上の前記導体パターンを更に樹脂層で覆って、前記導体パターンを前記樹脂層で封止する工程と、
前記剥離層と共に前記支持板を除去して、前記電子部品および前記ポストを露出する工程と、
を含むことを特徴とする電子部品パッケージの製造方法。 - 前記電子部品用凹部と前記ポスト用凹部との各々を別工程で、前記支持板の一面側にサンドブラストを施して形成し、
前記ポスト用凹部の形成の際、前記電子部品用凹部よりも凹部の深さを深くする請求項1記載の電子部品パッケージの製造方法。 - 前記支持板として、シリコン又はガラスから成る支持板を用いる請求項1又は請求項2記載の電子部品パッケージの製造方法。
- 前記支持板として、シリコンから成る支持板を用い、前記電子部品用凹部と前記ポスト用凹部との各々を、ドライエッチングによって形成する請求項1記載の電子部品パッケージの製造方法。
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