MULTILAYER INDUCTOR

• Main Authors: SUZUKI MINAKO, MATSUBAYASHI DAISUKE, KITAOKA MIKIO, OKUDA KENJI
• Format: Patent
• Language: English; Japanese
• Published: 09.11.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

PROBLEM TO BE SOLVED: To provide a multilayer inductor capable of dealing with current enlargement and loss reduction by improving a DC superposition property with a permanent magnet that generates a bias magnetic flux.SOLUTION: In the multilayer inductor, a plurality of electrically insulative magnetic substance layers 1 and conductive patterns 2 are laminated and the conductive patterns 2 are successively connected in a direction of the lamination through a via hole of a non-magnetic substance layer 3, such that a spirally wound coil 2 is formed within the magnetic substance layer 1. Just above a top layer 2a and just under a bottom layer 2b in the lamination direction of the conductive patterns 2, an annular permanent magnet 5 is disposed which extends along a full circumference of the conductive pattern 2 in a planar view and is magnetized so as to generate a magnetic flux in a direction Y reverse to a direction X of a magnetic flux excited by the coil 2. Between an outer periphery of the permanent magnet layer 5 and an outer edge 1a of the multilayer inductor, a non-magnetic substance layer 6 is disposed over a full circumference. 【課題】バイアス磁束を発する永久磁石によって直流重畳特性を改善することができ、よって大電流化および低損失化に対応することが可能になる積層インダクタを提供する。【解決手段】複数の電気絶縁性の磁性体層１および導電パターン２が積層され、各々の導電パターン２が非磁性体層３のビア穴を通じて上記積層方向に順次接続されることにより磁性体層１内に螺旋状に周回するコイル２が形成された積層インダクタにおいて、導電パターン２の積層方向の最上層２ａの直上および最下層２ｂの直下に、平面視において導電パターン２の全周に沿って延在するとともに、コイル２によって励磁される磁束の方向Ｘと逆方向Ｙの磁束を発するように着磁された環状の永久磁石層５を配置し、かつ永久磁石層５の外周と積層インダクタの外周縁１ａとの間に、全周にわたって非磁性体層６を配置した。【選択図】図１