JP2005333516A - Coil antenna - Google Patents
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- JP2005333516A JP2005333516A JP2004151298A JP2004151298A JP2005333516A JP 2005333516 A JP2005333516 A JP 2005333516A JP 2004151298 A JP2004151298 A JP 2004151298A JP 2004151298 A JP2004151298 A JP 2004151298A JP 2005333516 A JP2005333516 A JP 2005333516A
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- Soft Magnetic Materials (AREA)
Abstract
Description
本発明は、低中波帯の送信と受信に使用するコイルアンテナに関するもので、特に自動車用又は住宅用の携帯キー等に好適に使用されるコイルアンテナに関する。 The present invention relates to a coil antenna used for transmission and reception in a low and medium wave band, and more particularly to a coil antenna suitably used for a portable key for an automobile or a house.
近年、通信端末の小型化、多用途化が進み、低中波帯の電波を利用した端末が、多く見られる。例えば、特許文献１に開示された車両用キーレスシステムコイルアンテナなどがあり、その低中波領域のコイルアンテナとしてフェライト材料のコア（焼結フェライト）を使用した、コイルアンテナが普及している。 In recent years, communication terminals have become smaller and more versatile, and there are many terminals that use radio waves in the low and medium wave band. For example, there is a vehicle keyless system coil antenna disclosed in Patent Document 1, and a coil antenna using a ferrite material core (sintered ferrite) as a coil antenna in the low and medium wave region is widespread.
フェライト材料のコア（焼結フェライト）を使用したコイルアンテナは、耐衝撃性（コア割れ等の不具合防止）、形状の多様化（異形状、指向性の多軸化、軽薄短小、大型化）が市場から要求されているが、耐衝撃性の不足、あるいは製作性が悪いなどの問題が起きている。特に最近の自動車用スマートキー等は使用者がポケットにキーを入れたままでキーの開閉が可能であり利便性が強調されているが、常時携帯（ポケット等）での使用上、薄型・軽量化が強く求められており、また一方ではポケットや手から落としてしまうことも多く、このため落下衝撃によるコア破損は、致命的な故障となるため耐衝撃性が必要となる。 Coil antennas that use a ferrite material core (sintered ferrite) have impact resistance (preventing defects such as core cracks) and diversified shapes (different shapes, multi-directional directivity, lighter, shorter, smaller, and larger) Although demanded by the market, there are problems such as insufficient impact resistance or poor manufacturability. In particular, recent smart keys for automobiles can be opened / closed while the user keeps the key in the pocket, and the convenience is emphasized. However, it is always thinner and lighter for portable use (pocket etc.). On the other hand, it is often dropped from a pocket or hand, and therefore core breakage due to drop impact is a fatal failure, and impact resistance is required.
これらの要求を満足するためにはフェライト等のセラミック材では薄型になるとコア割れを起こしやすく、耐衝撃性が確保できない。またアモルファスコアの様なメタル系コアの積層も試みられているが、高価で、生産性に於いても、硬度が高く加工が難しいためコストが高くなるという問題がある。このため樹脂と複合したプラスチックフェライトなども検討されているが、ある程度、衝撃性、生産性については、改善はされるが、アンテナとしての特性を追求すると、フェライトの充填率を上げる必要があり、そのため結局はアンテナ特性を満たすプラスチックフェライト材は焼結フェライトと同じように耐衝撃性が弱くなるという問題が発生している。 In order to satisfy these requirements, a ceramic material such as ferrite is liable to cause a core crack when it is thin, so that the impact resistance cannot be ensured. In addition, attempts have been made to laminate metal cores such as amorphous cores, but there is a problem that the cost is high due to the high cost and the high hardness and difficulty in processing. For this reason, plastic ferrite combined with resin has been studied, but impact and productivity are improved to some extent, but pursuing characteristics as an antenna, it is necessary to increase the filling rate of ferrite, As a result, there is a problem that the plastic ferrite material satisfying the antenna characteristics becomes weak in impact resistance like the sintered ferrite.
この状況において、本発明の課題は、アンテナ特性が十分であり、多様な形状が可能であり、耐衝撃性に優れるコイルアンテナを提供することにある。 In this situation, an object of the present invention is to provide a coil antenna that has sufficient antenna characteristics, can have various shapes, and has excellent impact resistance.
そこで、これらの問題を解決するため、軟磁性体粉末と有機結合材としてエラストマーやプラストマーからなるコアを用いる事により、硬質層と軟質層からなり柔軟性とゴム弾性に富む、耐衝撃性を向上した、生産性が良好なコイルアンテナが出来、多用途化（異形状、指向性の多軸化、軽薄短小、大型化）が進むアンテナ市場に対応が可能となる。本発明のコアは、ＦＰＣ（フレキシブルプリント配線）の様な薄い物から、数センチの物まで製作が可能で、刃型、プレス金型、カッターの様な刃物等で切断が出来、有機結合剤の選定により成型も可能である。また、積層する事により更に複雑な形状にも対応が可能である。 Therefore, in order to solve these problems, by using a soft magnetic powder and a core made of an elastomer or plastomer as an organic binder, it is composed of a hard layer and a soft layer and is rich in flexibility and rubber elasticity, improving impact resistance. Thus, it is possible to produce a coil antenna with good productivity, and to cope with an antenna market in which versatility (different shape, multi-directional directivity, lightness, shortness, and size) is increasing. The core of the present invention can be manufactured from a thin object such as FPC (flexible printed wiring) to a material of several centimeters, and can be cut with a blade tool, a press die, a blade tool such as a cutter, etc., and an organic binder. Molding is also possible by selection. Furthermore, it is possible to cope with more complicated shapes by laminating.
すなわち、本発明によれば、コアに巻線してなるコイルアンテナにおいて、前記コアは、軟磁性体粉末と有機結合剤とを含んでなる絶縁性軟磁性体からなり、前記軟磁性体粉末は、鉄アルミ珪素合金、鉄ニッケル合金、鉄コバルト合金、鉄コバルトシリコン合金、鉄シリコンバナジューム合金、鉄コバルトボロン合金、コバルト系アモルファス合金、鉄系アモルファス合金、酸化物磁性粉末、カーボニル鉄、モリブデンパーマロイ、純鉄圧粉の軟磁性材料群から選ばれるいずれか１つ又はそれらの組み合わせからなり、前記有機結合剤は、ポリエステル系樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ニトリル−ブタジエン系ゴム、スチレン−ブタジエン系ゴム、エポキシ樹脂、フェノール樹脂、ポリアミド系樹脂、ポリイミド系樹脂の群から選ばれるいずれか１つ又はそれらの組み合わせを含んでなることを特徴とするコイルアンテナが得られる。 That is, according to the present invention, in the coil antenna wound around the core, the core is made of an insulating soft magnetic material including a soft magnetic powder and an organic binder, and the soft magnetic powder is , Iron aluminum silicon alloy, iron nickel alloy, iron cobalt alloy, iron cobalt silicon alloy, iron silicon vanadium alloy, iron cobalt boron alloy, cobalt amorphous alloy, iron amorphous alloy, oxide magnetic powder, carbonyl iron, molybdenum permalloy, It consists of any one selected from a soft magnetic material group of pure iron dust or a combination thereof, and the organic binder includes a polyester resin, a polyvinyl chloride resin, a polyvinyl butyral resin, a polyurethane resin, a cellulose resin, Nitrile-butadiene rubber, styrene-butadiene rubber, epoxy resin, phenol Resin, polyamide resin, the coil antenna, characterized in that it comprises any one or a combination thereof selected from the group consisting of polyimide resin is obtained.
また本発明によれば、前記有機結合剤には、有機系難燃剤であるハロゲン化物又はハロゲン化ポリマーが添加されたことを特徴とするコイルアンテナが得られる。 According to the invention, it is possible to obtain a coil antenna in which a halide or a halogenated polymer as an organic flame retardant is added to the organic binder.
また本発明によれば、前記軟磁性体粉末が、偏平状及び／又は針状の粉末であることを特徴とするコイルアンテナが得られる。 According to the present invention, it is possible to obtain a coil antenna in which the soft magnetic powder is flat and / or needle-shaped powder.
また本発明によれば、前記軟磁性体粉末は、導電性の粉末からなり、表面に酸化被膜を有するか、有機結合剤により絶縁コーティングされたことを特徴とするコイルアンテナが得られる。 According to the present invention, it is possible to obtain a coil antenna in which the soft magnetic powder is made of a conductive powder and has an oxide film on its surface or an insulating coating with an organic binder.
また本発明によれば、前記絶縁性軟磁性体は、軟磁性体粉末と有機結合剤とを含むと共に誘電体粉末を含むことを特徴とするコイルアンテナが得られる。 According to the invention, it is possible to obtain a coil antenna characterized in that the insulating soft magnetic material includes a soft magnetic material powder and an organic binder and a dielectric powder.
また本発明によれば、前記絶縁性軟磁性体は層状であり、絶縁性軟磁性体層と誘電体層とからなり、前記誘電体層は誘電体粉末と有機結合剤とを含むことを特徴とするコイルアンテナが得られる。 According to the invention, the insulating soft magnetic material is layered, and includes an insulating soft magnetic material layer and a dielectric layer, and the dielectric layer includes dielectric powder and an organic binder. A coil antenna is obtained.
また本発明によれば、前記コアは可撓性を有することを特徴とするコイルアンテナが得られる。 According to the invention, it is possible to obtain a coil antenna in which the core has flexibility.
また本発明によれば、前記コアは平板状であることを特徴とするコイルアンテナが得られる。 According to the invention, it is possible to obtain a coil antenna in which the core has a flat plate shape.
また本発明によれば、前記コアは少なくとも１枚の基板に貼り付けられたことを特徴とするコイルアンテナが得られる。 According to the invention, there is obtained a coil antenna in which the core is attached to at least one substrate.
そして本発明によれば、前記基板は巻線用の凹部を有することを特徴とするコイルアンテナが得られる。 And according to this invention, the said board | substrate has the recessed part for winding, The coil antenna characterized by the above-mentioned is obtained.
本発明では、高透磁率の軟磁性体粉末を用いたのでアンテナ特性が十分であり、またエラストマー又はプラストマーを結合剤として用いたので多様な形状が可能で耐衝撃性に優れるコイルアンテナを提供することができる。 In the present invention, a high magnetic permeability soft magnetic powder is used, so that the antenna characteristics are sufficient, and since an elastomer or plastomer is used as a binder, various shapes are possible and a coil antenna having excellent impact resistance is provided. be able to.
また軟磁性体粉末の形状を扁平状あるいは針状としたので、高周波透磁率を高めることができた。 Moreover, since the shape of the soft magnetic powder was flat or needle-like, the high-frequency magnetic permeability could be increased.
またコアの渦電流を防止するのに、（１）導電性の軟磁性体粉末には表面酸化被膜を形成するか、絶縁コーティングを施す、（２）軟磁性粉末に誘電体粉末を添加する、（３）軟磁性粉末の層と誘電体の層を組み合わせた層状構造にするなどの対策を施し、高周波透磁率を高めることができた。 In order to prevent eddy currents in the core, (1) a conductive soft magnetic powder is formed with a surface oxide film or an insulating coating is applied, and (2) a dielectric powder is added to the soft magnetic powder. (3) By taking measures such as a layered structure in which a soft magnetic powder layer and a dielectric layer are combined, the high-frequency magnetic permeability can be increased.
次に、図１と図２を参照して本発明の実施の形態を説明する。図１は、本発明のコイルアンテナを示す斜視図であり、１ａ、１ｂ、１ｃ及び１ｄは端子、２ａ及び２ｂはコイル、３ａ及び３ｂはコア、４ａ及び４ｂは基板である。なお、コイル２ａ、２ｂは模式的に示した。図２は、本発明のコイルアンテナの構成要素を示し、図２（ａ）は基板を示す斜視図、図２（ｂ）はコアを示す斜視図である。
Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a coil antenna of the present invention, wherein 1a, 1b, 1c and 1d are terminals, 2a and 2b are coils, 3a and 3b are cores, and 4a and 4b are substrates. The
ここで、コア３ａ、３ｂは絶縁性軟磁性体の板であり、高周波透磁率の高い軟磁性体粉末と有機結合剤からなる。このとき、軟磁性体粉末には、鉄アルミ珪素合金（センダスト）、鉄ニッケル合金（パーマロイ）、鉄コバルト合金、鉄コバルトシリコン合金、鉄シリコンバナジウム合金、鉄コバルトボロン合金、コバルト系アモルファス合金、鉄系アモルファス合金、酸化物磁性粉末（フェライト）、カーボニル鉄、モリブデンパーマロイ、純鉄圧粉などの高周波透磁率の高い軟磁性材料を用い、それらを組み合わせて用いてもよい。そのとき、粉末の形状を扁平状あるいは針状とすると反磁場係数などの点で有利である。
Here, the
また鉄アルミ珪素合金（センダスト）のような導電性の粉末にはその表面に酸化被膜を形成して、渦電流を防止する。カーボニル鉄などの場合も有機結合剤による絶縁コーティングを施して用いると渦電流を防止できる。更に、誘電体粉末を混入すると効果的である。 In addition, an oxide film is formed on the surface of conductive powder such as iron aluminum silicon alloy (Sendust) to prevent eddy current. In the case of carbonyl iron or the like, eddy current can be prevented by using an insulating coating with an organic binder. Furthermore, it is effective to mix dielectric powder.
このような軟磁性体粉末及び有機結合剤からなる磁性層と、誘電体粉末及び有機結合剤からなる誘電体層を複合して、層状の絶縁性軟磁性板を形成すると、渦電流の防止のみならず、透磁率特性を制御するのに効果的である。 Combining such a magnetic layer made of soft magnetic powder and organic binder with a dielectric layer made of dielectric powder and organic binder to form a layered insulating soft magnetic plate can only prevent eddy currents. Rather, it is effective for controlling the magnetic permeability characteristics.
そのとき用いる有機結合剤には、ポリエステル系樹脂、ポリ塩化ビニル系樹脂、ポリビニルブチラール樹脂、ポリウレタン樹脂、セルロース系樹脂、ニトリル−ブタジエン系ゴム、スチレン−ブタジエン系ゴム、エポキシ樹脂、フェノール樹脂、ポリアミド系樹脂、ポリイミド系樹脂等の樹脂あるいは共重合体を使用することが出来、熱可塑性であっても熱硬化性であってもよく、エラストマーであっても、プラストマーであってもよい。多様な製品形状に対応できること及び耐衝撃性向上のための可撓性が重要であり、製品に応じて選択することができる。 The organic binder used at that time is polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, nitrile-butadiene rubber, styrene-butadiene rubber, epoxy resin, phenol resin, polyamide resin. Resins such as resins and polyimide resins or copolymers can be used, and may be thermoplastic or thermosetting, elastomer, or plastomer. Flexibility for adapting to various product shapes and improving impact resistance is important, and can be selected according to the product.
更に、有機結合剤には、ハロゲン化物の有機系難燃剤、臭素化ポリマーなどのハロゲン化ポリマーを添加して、難燃化をはかるとよい。 Furthermore, it is preferable to add a halogenated polymer such as a halogenated organic flame retardant or a brominated polymer to the organic binder to achieve flame retardancy.
本実施の形態では、図２のような両端部に端子が形成され、中間部に巻線用の凹部５が設けられた帯状の基板を２枚用いて、図１のように基板４ａ及び４ｂにコア３ａ及び３ｂを貼り付け、Ｘ方向に指向性を持つコイル２ａと、Ｙ方向に指向性を持つコイル２ｂを巻回し、その端部を端子１ａ、１ｂ、１ｃ又は１ｄに接続して、本発明のアンテナコイルを得る。
In the present embodiment, two strip-shaped substrates having terminals formed at both ends as shown in FIG. 2 and
本発明のコイルアンテナと、同形状の従来型フェライトアンテナを製作し特性比較を行った。 A coil antenna of the present invention and a conventional ferrite antenna of the same shape were manufactured and the characteristics were compared.
本実施例の構造は既に示した図１のとおりである。本発明のコイルアンテナのうち自動車用カード型携帯キーに使用されるコイルアンテナの一例である。１５×１５×１．５ｍｍのコア３ａ、３ｂに０．０６ｍｍの線径の銅線で３５０ターンの巻線が施されている。コア３ａ、３ｂには、軟磁性体微粉末にＦｅ−Ａｌ−Ｓｉ合金粉末を用い、有機結合剤にポリウレタン樹脂と硬化剤からなるものを用い、１ｍｍの厚みで構成し、２枚を重ね合わせたコア３ａ、３ｂに、ポリウレタン線のコイル２ａ、２ｂを巻線した物である。Ｆｅ−Ａｌ−Ｓｉ合金粉末は反磁場係数を抑えるため、粉末粒径を偏平形状にした。また渦電流損を抑えるため粉末粒に酸化膜等の絶縁を施した。こうして得られたコアは材料透磁率が周波数１ｋＨｚ〜１ＭＨｚにおいて例えば３０≦μ’≦１０００であった。また周波数１ＭＨｚ以上での材料透磁率は図４のようであった。このコア材に３５０ターン巻線して本発明のコイルアンテナとしたとき、１０ｃｍ法にてアンテナ利得を測定したところ、周波数１３０ｋＨｚにおいて約−３４ｄＢと、同形状の従来型フェライトアンテナが約−４０ｄＢに対して６ｄＢ以上優れた特性を示した。図３にその結果を示す。
The structure of the present embodiment is as shown in FIG. It is an example of the coil antenna used for the card type portable key for cars among the coil antennas of the present invention. The
更に本発明のアンテナは１．５ｍの高さからコンクリート面に落下させたとき、まったく壊れず特性にも影響しないのに対して、従来のフェライトアンテナはコア割れを生じアンテナ特性が得られなくなった。 Furthermore, when the antenna of the present invention is dropped on a concrete surface from a height of 1.5 m, it does not break at all and does not affect the characteristics. On the other hand, the conventional ferrite antenna has a core crack and the antenna characteristics cannot be obtained. .
このように本発明によれば従来コイルアンテナ以上の特性が得られ、更に耐衝撃性に優れた、コイルアンテナの供給が可能となる。 As described above, according to the present invention, it is possible to provide a coil antenna having characteristics superior to those of the conventional coil antenna and further excellent in impact resistance.
１ａ、１ｂ、１ｃ、１ｄ 端子
２ａ、２ｂ コイル
３ａ、３ｂ コア
４ａ、４ｂ 基板
５ 凹部
1a, 1b, 1c,
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2004151298A JP4673577B2 (en) | 2004-05-21 | 2004-05-21 | Coil antenna |
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| JP2004151298A JP4673577B2 (en) | 2004-05-21 | 2004-05-21 | Coil antenna |
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| JP2005333516A true JP2005333516A (en) | 2005-12-02 |
| JP4673577B2 JP4673577B2 (en) | 2011-04-20 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008018179A1 (en) * | 2006-08-11 | 2008-02-14 | Mitsui Chemicals, Inc. | Antenna core and antenna |
| JP2008193187A (en) * | 2007-02-01 | 2008-08-21 | Nec Tokin Corp | Receiving coil antenna |
| WO2008105483A1 (en) * | 2007-02-28 | 2008-09-04 | Ntn Corporation | Dielectric elastomer composition and antenna member |
| WO2008105482A1 (en) * | 2007-02-28 | 2008-09-04 | Ntn Corporation | Dielectric elastomer composition and antenna member |
| JP2009267767A (en) * | 2008-04-25 | 2009-11-12 | Hitachi Ferrite Electronics Ltd | Triaxial receiving antenna device for low frequency |
| CN102964774A (en) * | 2012-10-16 | 2013-03-13 | 横店集团东磁股份有限公司 | Manufacturing method of soft magnetic alloy composite material |
| CN103862048A (en) * | 2012-12-07 | 2014-06-18 | 中国科学院理化技术研究所 | Method for preparing soft magnetic composite material by hot pressing |
| JP2017508388A (en) * | 2014-02-25 | 2017-03-23 | プレモ・エセエレPremo, S.L. | Antenna and antenna manufacturing method |
-
2004
- 2004-05-21 JP JP2004151298A patent/JP4673577B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008018179A1 (en) * | 2006-08-11 | 2008-02-14 | Mitsui Chemicals, Inc. | Antenna core and antenna |
| JPWO2008018179A1 (en) * | 2006-08-11 | 2009-12-24 | 三井化学株式会社 | Antenna core and antenna |
| US8035569B2 (en) | 2006-08-11 | 2011-10-11 | Mitsui Chemicals, Inc. | Antenna core and antenna |
| JP2008193187A (en) * | 2007-02-01 | 2008-08-21 | Nec Tokin Corp | Receiving coil antenna |
| WO2008105483A1 (en) * | 2007-02-28 | 2008-09-04 | Ntn Corporation | Dielectric elastomer composition and antenna member |
| WO2008105482A1 (en) * | 2007-02-28 | 2008-09-04 | Ntn Corporation | Dielectric elastomer composition and antenna member |
| US8173732B2 (en) | 2007-02-28 | 2012-05-08 | Ntn Corporation | Dielectric elastomer composition and antenna member |
| JP2009267767A (en) * | 2008-04-25 | 2009-11-12 | Hitachi Ferrite Electronics Ltd | Triaxial receiving antenna device for low frequency |
| CN102964774A (en) * | 2012-10-16 | 2013-03-13 | 横店集团东磁股份有限公司 | Manufacturing method of soft magnetic alloy composite material |
| CN103862048A (en) * | 2012-12-07 | 2014-06-18 | 中国科学院理化技术研究所 | Method for preparing soft magnetic composite material by hot pressing |
| JP2017508388A (en) * | 2014-02-25 | 2017-03-23 | プレモ・エセエレPremo, S.L. | Antenna and antenna manufacturing method |
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