JP2017174949A - 電子回路パッケージ - Google Patents
電子回路パッケージ Download PDFInfo
- Publication number
- JP2017174949A JP2017174949A JP2016058731A JP2016058731A JP2017174949A JP 2017174949 A JP2017174949 A JP 2017174949A JP 2016058731 A JP2016058731 A JP 2016058731A JP 2016058731 A JP2016058731 A JP 2016058731A JP 2017174949 A JP2017174949 A JP 2017174949A
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- Japan
- Prior art keywords
- film
- electronic circuit
- magnetic
- circuit package
- metal film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Images
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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Abstract
【解決手段】電源パターン25Gを有する基板20と、基板20の表面21に搭載された電子部品31,32と、電子部品31,32を埋め込むよう、基板20の表面21を覆うモールド樹脂40と、モールド樹脂40の少なくとも上面を覆う磁性膜50と金属膜60の積層体とを備える。金属膜60は電源パターン25Gに接続されており、磁性膜50と金属膜60の界面における抵抗値は106Ω以上である。本発明によれば、磁性膜50と金属膜60の界面における抵抗値が106Ω以上であることから、電磁波ノイズが金属膜60に入射されることにより生じる渦電流がほとんど磁性膜50に流れ込まない。このため、渦電流の流入による磁性膜50の磁気特性の低下を防止することが可能となる。
【選択図】図1
Description
図1は、本発明の第1の実施形態による電子回路パッケージ11Aの構成を示す断面図である。
図11は、本発明の第2の実施形態による電子回路パッケージ12Aの構成を示す断面図である。
図17は、本発明の第3の実施形態による電子回路パッケージ13Aの構成を示す断面図である。
図26は、本発明の第4の実施形態による電子回路パッケージ14Aの構成を示す断面図である。
以下の方法によって、複合磁性ペーストA(比較例)及び複合磁性ペーストB(実施例)を作成した。
(1)透磁率の測定
複合磁性ペーストA,Bを用いて、外径φ=8mm、内径φ=3.1mm、厚み2mmのリング形状のサンプルを作製し、アジレント社製インピーダンスアナライザーE4991のマテリアルアナライザー機能を用いて10MHzでの透磁率μ'を測定した。測定の結果、複合磁性ペーストA(比較例)を用いて作製したサンプルの透磁率はμ'=35、複合磁性ペーストB(実施例)を用いて作製したサンプルの透磁率はμ'=34であり、有意の差は認められなかった。
次に、30mm×30mmの基板の全面に複合磁性ペーストA,Bをスクリーン印刷により厚み50μm塗布した後、溶剤を乾燥させ、180℃60分で硬化させることによって磁性膜を形成した。そして、磁性膜の表面に平面サイズが10mm×5mmの測定用電極を5mm間隔で2つ形成し、所定の硬化条件にて硬化することによって、表面抵抗値測定サンプルA1,B1を得た。表面抵抗値測定サンプルA1は複合磁性ペーストA(比較例)を使用したサンプルであり、表面抵抗値測定サンプルB1は複合磁性ペーストB(実施例)を使用したサンプルである。
次に、基板に50Ωの抵抗が実装され、封止成形されたシールド評価用パッケージの上面にスクリーン印刷にて複合磁性ペーストA(比較例)を厚み50μmで形成し、硬化させて磁性膜とした後、ダイサーで個品化処理を行うことによって、基板の側面にグランドパターンを露出させた。そして、無電解メッキを施すことにより、グランドパターンと接するよう、磁性膜の上面及び側面、並びに、基板の側面にCu(膜厚1μm)とNi(膜厚2μm)の積層膜からなる金属膜を形成し、ノイズ減衰量測定サンプルA3を得た。
20 基板
20A 集合基板
21 基板の表面
22 基板の裏面
23 ランドパターン
24 ハンダ
25 内部配線
25G 電源パターン
26 外部端子
27 基板の側面
27a 側面上部
27b 側面下部
27c 段差部分
28,29 配線パターン
31,32 電子部品
40 モールド樹脂
41 モールド樹脂の上面
42 モールド樹脂の側面
43〜46 溝
50 磁性膜
51 磁性膜の上面
52 磁性膜の側面
60 金属膜
61 金属膜の上面
62 金属膜の側面
70 絶縁膜
Claims (12)
- 電源パターンを有する基板と、
前記基板の表面に搭載された電子部品と、
前記電子部品を埋め込むよう、前記基板の前記表面を覆うモールド樹脂と、
前記モールド樹脂の少なくとも上面を覆う磁性膜と金属膜の積層体と、を備え、
前記金属膜は、前記電源パターンに接続されており、
前記磁性膜と前記金属膜の界面における抵抗値は、106Ω以上であることを特徴とする電子回路パッケージ。 - 前記積層体は、前記モールド樹脂の側面をさらに覆うことを特徴とする請求項1に記載の電子回路パッケージ。
- 前記積層体は、前記磁性膜と前記金属膜との間に介在する絶縁材料を含むことを特徴とする請求項1又は2に記載の電子回路パッケージ。
- 前記積層体は、前記磁性膜が前記モールド側に位置するよう積層されていることを特徴とする請求項1乃至3のいずれか一項に記載の電子回路パッケージ。
- 前記積層体は、前記金属膜が前記モールド側に位置するよう積層されていることを特徴とする請求項1乃至3のいずれか一項に記載の電子回路パッケージ。
- 前記磁性膜は、熱硬化性樹脂材料に磁性フィラーが分散された複合磁性材料からなる膜であることを特徴とする請求項1乃至5のいずれか一項に記載の電子回路パッケージ。
- 前記磁性フィラーは、フェライト又は軟磁性金属からなることを特徴とする請求項6に記載の電子回路パッケージ。
- 前記磁性フィラーの表面が絶縁コートされていることを特徴とする請求項7に記載の電子回路パッケージ。
- 前記磁性膜は、軟磁性材料もしくはフェライトからなる薄膜、箔又はバルクシートであることを特徴とする請求項1乃至5のいずれか一項に記載の電子回路パッケージ。
- 前記金属膜は、Au、Ag、Cu及びAlからなる群から選ばれた少なくとも1つの金属を主成分とすることを特徴とする請求項1乃至9のいずれか一項に記載の電子回路パッケージ。
- 前記金属膜の表面が酸化防止被覆で覆われていることを特徴とする請求項1乃至10のいずれか一項に記載の電子回路パッケージ。
- 前記電源パターンは前記基板の側面に露出しており、前記金属膜は前記基板の前記側面に露出した前記電源パターンと接していることを特徴とする請求項1乃至11のいずれか一項に記載の電子回路パッケージ。
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