JP2005057444A - 小型高感度アンテナ - Google Patents
小型高感度アンテナ Download PDFInfo
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Abstract
【解決手段】 芯材に絶縁体で被覆された導電性線材が巻回されているアンテナにおいて、該導電性線材が巻回されている領域の端部に堰が設けられていることを特徴とするアンテナを用いる。堰は、金属磁性粉末5〜60Vol%と樹脂とからなる組成物により形成されている複合体から成り、前記金属磁性粉末は、扁平上のナノ結晶磁性金属材料を用いることが好ましい。
【選択図】図1
Description
(アンテナ)
本発明のアンテナの例を図1に示す。本発明は、アンテナの芯材11、堰12、被覆導電性線材が巻回されている領域13の3つの要素から構成される。
(アンテナの芯材)
本発明のアンテナの芯材について説明する。
(非晶質合金薄帯)
本発明のアンテナに使用される非晶質金属薄帯に用いられる磁性材料としては、Fe 系、Co 系の非晶質金属薄帯が用いられる。これらの非晶質金属薄帯は、通常溶融金属を急冷ロールを用いて、急冷して得られる。通常は10 〜50 μm の厚さであり、好ましくは10 〜30 μm の厚さの薄帯が用いられる。
(塗工基材および積層体)
本発明のアンテナの芯材が耐熱樹脂を表面にコートした非晶質金属薄帯とからなる場合、非晶質金属薄帯の原反からロールコータなどのコーティング装置で、非晶質金属薄帯上に液状樹脂の塗膜を作り,これを乾燥させて非晶質金属薄帯に耐熱性樹脂を付与する方法で作製することができる。
(アンテナの作製方法)
アンテナの芯材は、目的とする磁性コアに使用されるように所望の形状に加工される。形状加工方法としては、ダイサー加工、打抜き加工、エッチング加工、レーザー加工、放電ワイヤー加工、ウォータージェット等により加工される。この中でも、アンテナの芯材形状が矩形の場合はダイサー加工が好ましい。また矩形以外の形状の場合は打抜き加工もしくはエッチング加工することが好ましい。
(堰)
本発明の堰は、被覆された導電性線材が巻回されている領域の両端に配置される。通常、巻回されている線材と堰は接している。
(構成材料)
本発明の磁性複合体は、磁性金属粉末と樹脂とを複合して構成される。
(磁性金属粉末)
本発明に用いられる磁性粉末は、ナノ結晶磁性金属粉、アモルファス磁性金属粉、パーマロイ粉末、センダスト粉末、珪素鋼板粉末などが挙げられる。この中でもアモルファス磁性金属粉とナノ結晶磁性金属粉がアンテナのL値及びQ値向上に著しい改善効果があることを見出した。その中でもナノ結晶非晶質金属粉が好ましく、さらに好ましくは偏平状のナノ結晶非晶質金属粉がアンテナのL値及びQ値向上に著しい改善効果を有している。
(ナノ結晶磁性粉末)
本発明に用いられるナノ結晶磁性材料は組織が粒径100nm以下のナノ結晶粒を主成分とする磁性材料であり、非晶質合金を結晶化温度以上で熱処理し、ナノ結晶粒を析出させることで得られる。
(樹脂材料)
本発明の堰の成形に金属紛体とともに用いられる樹脂材料の目的は、磁性複合体間の電気的絶縁と、磁性金属粉間の結着である。 このような材料として、無機系材料では水ガラス、セラミックス、有機系材料としては熱可塑性樹脂、熱硬化性樹脂など種々の樹脂が挙げられるが、特に磁気特性向上に200℃以上の熱処理が必要な場合は、熱可塑性、弾性率の低い耐熱樹脂を混ぜることが、優れた性能を発揮する上で効果的である。
本発明の堰を形成する組成物の作成方法としては、磁性金属粉末と、樹脂粉末を粉砕粉を混練する方法や、 磁性粉末と樹脂粉末を溶媒を用いず乾式で混合後、ホットプレスする方法や、ジメチルアセトアミドのような有機溶媒に樹脂を溶かし、磁性粉末を混合し、ペーストを作成し、金型に中で乾燥させ磁性複合体を作成する方法等がある。この中でも、磁性粉末と樹脂を乾式で混合し、直接ホットプレスをする方法で磁性複合体を作製することが好ましい。
(形状加工方法)
材料の複合化の後、アンテナの芯材に付加できるように形状加工を施す。成形方法は、磁性複合材料がペレット状の場合は射出成形または押出し成形が好適である。また溶剤を含まない混合粉の場合は、熱プレス等の方法が挙げられる。射出成形や押出し成形は量産時に低コストで製造できるため好ましい。
12 堰
13 被覆導線線材が巻回されている領域
21 磁性粉末複合体からなるケース
Claims (6)
- 芯材に絶縁体で被覆された導電性線材が巻回されているアンテナにおいて、該導電性線材が巻回されている領域の端部に堰が設けられていることを特徴とするアンテナ。
- 前記堰が、金属磁性粉末を含む組成物から成ることを特徴とする前記請求項1記載のアンテナ。
- 前記堰が、金属磁性粉末と樹脂とからなる組成物を含む複合体から成ることを特徴とする前記請求項1記載のアンテナ。
- 前記金属磁性粉末が、ナノ結晶磁性金属材料であることを特徴とする請求項1〜3記載のアンテナ。
- 前記金属磁性粉末の形状が偏平状であることを特徴とする前記請求項1〜4記載のアンテナ。
- 金属磁性粉末5〜60Vol%と樹脂95〜40Vol%とからなる組成物を含む前記請求項3の複合体を製造するための組成物。
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