JP5221143B2 - 平面磁気素子 - Google Patents
平面磁気素子 Download PDFInfo
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- JP5221143B2 JP5221143B2 JP2007542648A JP2007542648A JP5221143B2 JP 5221143 B2 JP5221143 B2 JP 5221143B2 JP 2007542648 A JP2007542648 A JP 2007542648A JP 2007542648 A JP2007542648 A JP 2007542648A JP 5221143 B2 JP5221143 B2 JP 5221143B2
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Description
本発明は、上記のように透磁率が低いために多量の磁性材量を使用する必要があったという従来の状況に鑑み、高いインダクタンス値が効果的に得られる配置構造を採用することにより、薄型化したインダクタなどの平面磁気素子を実現することを目的とする。
表1に示す組成を有する各磁性材料粉末を篩い分けして表1に示す最大粒径L(最大径)および平均粒径Dを有する磁性粉末を調製した。なお、表1に示す最大粒径は篩いの目開き値とした。各磁性粉末に対してエチルセルロース溶液を16質量%の割合で混合して磁性粉末ペーストをそれぞれ調製した。
実施例1−5において作製した第1の磁性層3の上面に、絶縁層としてのポリイミド樹脂を厚さ10μmになるようにバーコーターにて塗布した。次に、その絶縁層上面に実施例1−5と同様な平面コイル4を作製した。さらに、その平面コイル4の上面に絶縁層としてのポリイミド樹脂を厚さが10μmになるように塗布した。ついで、その絶縁層の上面に実施例1−5と同様な第2の磁性層5を印刷することにより、比較例1−5に係る平面磁気素子としての薄型インダクタをそれぞれ調製した。
表2に示す組成を有する各磁性材料粉末を篩い分けして表2に示す最大粒径L(最大径)および平均粒径Dを有する磁性粉末を調製した。なお、表2に示す最大粒径は篩いの目開き値とした。各磁性粉末に対してエポキシ樹脂溶液を11質量%の割合で混合して磁性粉末ペーストをそれぞれ調製した。
実施例6〜10において使用した最大粒径32μmの磁性粉末に代えて、最大粒径が150μmの粗大な磁性粉末を使用した点以外は実施例6〜10と同様に処理することにより、比較例6〜10に係る平面磁気素子としての薄型インダクタをそれぞれ調製した。
表3に示す組成を有する各磁性材料粉末を篩い分けして表3に示す最大粒径L(最大径)および平均粒径Dを有する磁性粉末を調製した。なお、表3に示す最大粒径は篩いの目開き値とした。各磁性粉末に対してポリイミド樹脂溶液を12質量%の割合で混合して磁性粉末ペーストをそれぞれ調製した。
実施例11〜15において、磁性粉末の結合剤として使用したポリイミド樹脂溶液に代えてシリコーン樹脂を12質量%の割合で添加した点以外は、実施例11〜15と同様に第1磁性層、平面コイルおよび第2磁性層の形成乾燥、焼成した後に、基体として使用したポリイミドシートを剥離させることにより、実施例16〜20に係る平面磁気素子としての薄型インダクタ1をそれぞれ調製した。なお、各実施例に係るコイルにおいてはコイル配線同士の間隔Wの線分中に含まれる磁性粉末の個数を3個以上とした。
表4に示す組成を有する磁性粉末を篩い分けして表4に示す最大粒径L(最大径)および平均粒径Dを有する磁性粉末を調製した。なお、表4に示す最大粒径は篩いの目開き値とした。磁性粉末に対してエチルセルロース溶液を16質量%の割合で混合して磁性粉末ペーストをそれぞれ調製した。
実施例21において銅箔を打ち抜いて作製されたスパイラル型平面コイル4に代えてエッチング法によって作製したスパイラルコイルを使用した点以外は実施例21と同様に処理して実施例22に係る平面磁気素子としての薄型インダクタ1を調製した。
表4に示す材料仕様および寸法仕様でスパイラルコイルをエッチング処理により形成することにより図1に示すような実施例23〜24に係る薄型インダクタ1をそれぞれ調製した。
表4に示す材料仕様および寸法仕様で製造し、スパイラルコイルをミアンダー型コイルに変更した点以外は実施例25〜26と同様に処理して図4に示すような実施例27〜28に係る薄型インダクタ1aをそれぞれ調製した。
表4に示す材料仕様および寸法仕様で製造し、エッチング法によりスパイラルコイルを製造した点以外は比較例1と同様に処理することにより、比較例11〜12に係る平面磁気素子としての薄型インダクタをそれぞれ調製した。
コイル配線同士の間隔をWとしたときに、長さWの線分中に含有される磁性粒子数を表5に示すように変更した点以外は、実施例11と同様に処理して実施例11と同様に処理して図1に示すような実施例29〜32に係る薄型インダクタをそれぞれ調製した。
以上の実施例においては平面コイルとして図1に示すような角型スパイラル形状コイルまたは図4に示すようなミアンダー形状コイルを設けた平面磁気素子を例にとって説明したが、本発明は上記実施例に限らず、たとえば図5に示すような、端子6を設けた丸型スパイラル形状の平面コイル4bを磁性層3に形成した場合においても同様な効果が得られる。
Claims (7)
- 磁性粉末と樹脂との混合物から成る第1の磁性層と第2の磁性層との間に平面コイルを有する平面磁気素子において、上記平面コイルのコイル配線同士の間隔をWとする一方、上記磁性粉末の最大径をLとしたときに、関係式W>2Lを満たすと共に、長さWの線分中に含まれる磁性粉末の個数が3個以上であり、上記磁性粉末の平均粒径が0.5μm以上であり、上記磁性層中に含有される磁性粉末と上記平面コイルとが、距離1μm以下に近接しているか、または接触している一方、上平面磁気素子の厚さが0.4mm以下であることを特徴とする平面磁気素子。
- 前記長さWの線分中に含まれる磁性粉末の個数が5個以上であることを特徴とする請求項1記載の平面磁気素子。
- 前記磁性粉末は、アモルファス合金、微細結晶合金、純鉄、センダスト、Fe−Ni系合金、Fe−Si系合金、フェライトの少なくとも1種から成ることを特徴とする請求項1乃至請求項2のいずれか1項に記載の平面磁気素子。
- 前記磁性粉末の平均粒径が80μm以下であることを特徴とする請求項1記載の平面磁気素子。
- 前記平面コイルは、金属粉末の焼成体から成ることを特徴とする請求項1乃至請求項4のいずれか1項に記載の平面磁気素子。
- 前記平面コイルは、金属箔をエッチングして形成されることを特徴とする請求項1乃至請求項5のいずれか1項に記載の平面磁気素子。
- 前記コイル配線同士の間隔Wが10〜200μmであることを特徴とする請求項1に記載の平面磁気素子。
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JP2013065904A (ja) | 2013-04-11 |
US20090045905A1 (en) | 2009-02-19 |
WO2007049692A1 (ja) | 2007-05-03 |
KR20080063783A (ko) | 2008-07-07 |
CN101297382B (zh) | 2011-05-04 |
KR100998814B1 (ko) | 2010-12-06 |
US7920043B2 (en) | 2011-04-05 |
JPWO2007049692A1 (ja) | 2009-04-30 |
JP5606560B2 (ja) | 2014-10-15 |
CN101297382A (zh) | 2008-10-29 |
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