JP5661824B2 - 電源icパッケージ - Google Patents
電源icパッケージ Download PDFInfo
- Publication number
- JP5661824B2 JP5661824B2 JP2013024618A JP2013024618A JP5661824B2 JP 5661824 B2 JP5661824 B2 JP 5661824B2 JP 2013024618 A JP2013024618 A JP 2013024618A JP 2013024618 A JP2013024618 A JP 2013024618A JP 5661824 B2 JP5661824 B2 JP 5661824B2
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- magnetic
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- resin
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Images
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
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- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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Description
5.5wt%Al−10wt%Si−Feの合金組成を有するセンダストの溶湯材料を水ガスアトマイズ法により処理して微細磁性粒子を調製した。すなわち、溶湯材料をるつぼから噴出させると同時に不活性ガス(Ar)を吹き付けて分散させ、さらに分散粒子を水中に導入して急冷することにより実施例1用の磁性粒子を調製した。
原子比率で(Co0.90−Fe0.05−Mn0.02−Nb0.03)71−Si15−B14の合金組成を有する溶湯材料を、水ガスアトマイズ法に準拠してるつぼから噴出させ、同時に不活性ガスを溶湯材料に吹き付け分散せしめ、分散した粒子を更に水中に投入することにより急冷し、アモルファス磁性粒子を作製した。
実施例1で使用したセンダスト、実施例2で使用したCo系アモルファス合金、組成がNi0.5Zn0.5Fe2O4(モル比)であるフェライト合金を粉砕、篩い分けすることにより、それぞれ表1に示す形状比および平均粒径を有する磁性粒子を調製した。得られた各磁性粒子に表1に示す含有量となるように所定量のバインダーを混合してそれぞれ磁性材料ペーストを調製した。
実施例1と同様に水アトマイズ法にしたがって、センダスト溶湯を分散冷却処理して磁性粒子を作製した。この様にして得られた磁性粒子は平均粒径(体積で50%)が28μmであった。さらに目開きが63μmの篩をかけることにより、63μmアンダーの微粒子のみを選択した。その後有機バインダーの含有量が1.4質量%となるように磁性粒子に対して添加し混合して磁性材料ペーストを作製した。次に、この磁性材料ペーストを用い、実施例1で使用したSi基板上に100μm厚さのパターン化された10mm×10mmの磁性シートを印刷し、100℃で30分間乾燥し、150℃で60分間焼成することにより第1磁性層3を形成した。
基体としてのSi基板の代わりに厚さ25μmのポリイミドフィルムを使用し、表1に示す形状比および平均粒径を有する磁性粒子を使用し、さらに最後に実施例12と同様のディップ処理を実施した点以外は実施例1と同様に処理することにより実施例13に係る平面磁気素子としてのインダクタを調製した。
表1に示す形状比および平均粒径を有するセンダスト磁性粒子を使用し、基体としてのSi基板の代わりに厚さ25μmのポリイミドフィルムを使用した点以外は実施例1と同様に処理することによりインダクタを調製した。その後、エチルセルロースをBCA(ブチルカルビトールアセテート)に溶解した溶液を上記のようにして形成したインダクタに対し、外部端子部分をマスク等で被覆した状態で吹き付け塗布した後、乾燥させることにより、脆性を低下させた実施例14に係る平面磁気素子を調製した。
原子比で(Co0.90Fe0.05Mn0.02Nb0.03)71−Si15−B14成る合金組成を有する溶湯材料を、るつぼから噴出し同時に不活性ガスを吹き付け、更に水中に投入する水ガスアトマイズ法で急冷することにより、表1に示す形状比および平均粒径を有するアモルファス磁性粒子を作製した。
実施例1で使用したセンダストを粉砕することにより、長軸と長軸(Lc)に直交する短軸の長さ(Sc)の比Sc/Lcが0.4である偏平な磁性粒子を作製した。この磁性粒子を目開きが63μmである篩にかけることにより、63μmアンダーの微細な磁性粒子のみを選択した。それ以外は実施例1と同様に処理することにより、作製したものを比較例1に係る平面磁気素子を調製した。
原子比で(Co0.90Fe0.05Mn0.02Nb0.03)71−Si15−B14成る組成を有するアモルファス磁性粒子を、目開きが32μmである篩にかけることにより、32μm以下の微細な磁性粒子のみを選択した。それ以外は実施例2と同様に処理して比較例2に係る平面磁気素子を調製した。
表1に示すように長軸長さ(L)および短軸長さ(S)が共に極めて微細なセンダスト磁性粒子を使用した点以外は実施例1と同様に処理して実施例16に係る平面磁気素子を調製した。
表1に示すように長軸長さ(L)および短軸長さ(S)が共に大きい粗大なセンダスト磁性粒子を使用した点以外は実施例1と同様に処理して実施例17に係る平面磁気素子を調製した。
表1に示すように磁性粒子中に含有される有機バインダーの含有量を高めて磁性層における磁性体の占有率を低下させた点以外は実施例1と同様に処理して参考例18に係る平面磁気素子を調製した。
表1に示すような形状比および平均粒径を有する磁性粒子を使用した点および最後にディップ処理を実施しない点以外は実施例13と同様に処理して実施例19に係る平面磁気素子を調製した。
Claims (4)
- 第1磁性層と第2磁性層との間に平面コイルを配設した平面磁気素子を用いた電源ICパッケージにおいて、長軸の長さをL、長軸に直交する短軸の長さをSとしたときの形状比S/Lが0.7〜1である磁性粒子が上記平面コイルのコイル配線同士の隙間に充填されていると共に、上記平面コイルのコイル配線同士の隙間をWμmとしたときに、前記磁性粒子の平均粒径が(W/2)μm以下であり、上記平面コイルのコイル配線同士の隙間への前記磁性粒子の充填率が30vol%以上62vol%以下であり、上記磁性粒子の平均粒径が0.46〜60.3μmである平面磁気素子を用いており、上記磁性粒子は、アモルファス合金、結晶軟磁性合金、フェライトの少なくとも1種から成り、上記第1磁性層と前記第2磁性層は、磁性粉末と樹脂との混合物から成ることを特徴とする電源ICパッケージ。
- 平面磁気素子の厚さが0.5mm以下であることを特徴とする請求項1に記載の電源ICパッケージ。
- 前記平面コイルは、金属粉末と樹脂との混合物から成ることを特徴とする請求項1または請求項2に記載の電源ICパッケージ。
- IC一体型であることを特徴とする請求項1に記載の電源ICパッケージ。
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