JP4196554B2 - Tag antenna coil and RFID tag using the same - Google Patents

Tag antenna coil and RFID tag using the same Download PDF

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Publication number
JP4196554B2
JP4196554B2 JP2001303050A JP2001303050A JP4196554B2 JP 4196554 B2 JP4196554 B2 JP 4196554B2 JP 2001303050 A JP2001303050 A JP 2001303050A JP 2001303050 A JP2001303050 A JP 2001303050A JP 4196554 B2 JP4196554 B2 JP 4196554B2
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Japan
Prior art keywords
antenna coil
coil
core member
magnetic core
article
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JP2001303050A
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JP2003108966A (en
Inventor
貴則 遠藤
政 米沢
隆 土田
誠朗 八幡
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Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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Priority to JP2001303050A priority Critical patent/JP4196554B2/en
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to PCT/JP2002/009955 priority patent/WO2003030300A1/en
Priority to CNA028234596A priority patent/CN1871743A/en
Priority to KR10-2004-7004371A priority patent/KR20040037127A/en
Priority to US10/490,704 priority patent/US7088304B2/en
Priority to EP02800249A priority patent/EP1439608A4/en
Priority to TW091122383A priority patent/TW589765B/en
Publication of JP2003108966A publication Critical patent/JP2003108966A/en
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Publication of JP4196554B2 publication Critical patent/JP4196554B2/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G06K19/0726—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G06K19/07777—Antenna details the antenna being of the inductive type
    • G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G06K19/07777—Antenna details the antenna being of the inductive type
    • G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
    • G06K19/07783—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/27—Spiral antennas

Description

【０００１】
【発明の属する技術分野】
本発明は、ＲＦＩＤ（無線周波数識別：Radio Frequency Identification）技術又はＥＡＳ（電子式物品監視：Electronic Article Sureillannce）技術を用いた識別タグに用いられるアンテナコイルに関するものである。
【０００２】
【従来の技術】
従来、ＲＦＩＤ技術又はＥＡＳ技術を用いたタグとして、アンテナコイルに情報を記憶したＩＣチップ又は共振用のコンデンサを電気的に接続した識別タグが知られている。これらの識別タグは、アンテナコイルに質問器の送受信アンテナから所定の周波数の電波を発信することによりタグを活性化し、電波のデータ通信による読出しコマンドに応じてＩＣチップに記憶された情報を読みとることにより、又は特定周波数の電波に対して共振するか否かによりその物品を識別又は監視するように構成されたものが知られている。
【０００３】
これらの識別タグに用いられる従来のアンテナコイルとして、表面が絶縁層にて被覆された導線を略正方形の渦巻き状に巻回してベース板に貼付けることにより形成されたものや、或いは図６に示すようにベース板１に積層したアルミニウム箔や銅箔等の導電層をエッチングにより略正方形の渦巻き状の渦巻き部２を形成したものが知られている。
また、別のアンテナコイルとして、図５に示すように板状又は円柱状等に形成された磁芯部材６と、この磁芯部材６に螺旋状に巻回された導体７とを有するアンテナコイルが知られている。
【０００４】
【発明が解決しようとする課題】
しかし、図６に示すアンテナコイルでは磁束が図の矢印で示すようにベース板１を上下に貫通する方向に生じ、そのアンテナコイルを金属製の物品に密着させると、アンテナコイルに向って発信された電波がそのベース板１を貫通し更に金属製物品を貫通する。このため、その貫通する磁束により金属部分に渦電流が生じ、その渦電流が影響を与えてアンテナコイルが正常に作動しなくなる問題点があった。また、仮に作動したとしてもその損失が増してアンテナコイルの作動距離が著しく短くなる不具合があった。
【０００５】
一方、図５に示すアンテナコイルでは、磁束が図の矢印で示すように磁芯部材６の軸芯方向に生じるので、このアンテナコイルを金属製の物品に取付けても、アンテナコイルに向って発信された電波が金属製物品を貫通することはなく正常に作動することが期待されているが、図５に示すアンテナコイルは、磁芯部材６の外周面に導体７を巻回することにより製作されるので、その巻線作業が比較的煩雑で量産性に欠ける不具合があった。また、アンテナコイル全体が比較的厚いものになり、このアンテナコイルを物品の表面に取付けると、そのアンテナコイルが物品から比較的大きく突出する問題点があった。
本発明の目的は、厚さを薄く保ちつつ、金属製の物品に密着させても確実に作動し得るタグ用アンテナコイル及びそれを用いたＲＦＩＤ用タグを提供することにある。
本発明の別の目的は、量産性に適したタグ用アンテナコイル及びそれを用いたＲＦＩＤ用タグを提供することにある。
【０００６】
【課題を解決するための手段】
請求項１に係る発明は、図１及び図２に示すように、平面内で渦巻き状に巻回された導体１１からなるコイル本体１１ａと、コイル本体１１ａにより包囲される中央部１１ｂに一端１３ａが位置しコイル本体１１ａの一部を横断して他端１３ｂがコイル本体１１ａの外部に位置するようにコイル本体１１ａの片面に接着された板状又はシート状の磁芯部材１３と、コイル本体１１ａの片面に磁芯部材１３を覆うように接着されたシート状又は板状の導電部材１６とを備えたことを特徴とするタグ用アンテナコイルである。
この請求項１に記載されたタグ用アンテナコイルでは、磁芯部材１３がコイル本体１１ａの一部を横断して接着されるので、アンテナコイルのＱ値を高めることができる。また、導体１１により形成されたコイル本体１１ａに流れる電流により生じる磁束はその磁芯部材１３を通過し、図１の実線矢印で示すようなループを描く。このため、その磁束方向は物品の表面と平行になり、物品の金属により形成されている表面にこのタグ用アンテナコイルを取付けても、その物品表面の金属に生じる渦電流は抑制され、このアンテナコイルは確実に作動する。
また、導体１１により形成されたコイル本体１１ａと物品と間にその導電部材１６が介在するので、その導電部材１６が物品への電波の通過を遮蔽するため、物品の表面が金属により形成されていても、その金属面に生じる渦電流等による損失は発生せずに確実に動作することができる。
【０００７】
請求項２に係る発明は、請求項１に係る発明であって、コイル本体１１ａが導電性板又は箔を打ち抜くことにより形成されたタグ用アンテナコイルである。
請求項２に係るタグ用アンテナコイルでは、コイル本体１１ａの形成が容易になりアンテナコイルの生産性を向上させることができる。
請求項３に係る発明は、請求項１に係る発明であって、電気絶縁フィルム又はシート１２の一方の主面全体に接着された導電性箔を所定のパターンでエッチングすることにより、又は電気絶縁フィルム又はシート１２の一方の主面に導電材料を所定のパターンでスクリーン印刷若しくは蒸着することにより、コイル本体１１ａが形成されたタグ用アンテナコイルである。
請求項３に係るタグ用アンテナコイルでは、導体１１を電気絶縁フィルム１２又はシートに設けるので、その取り扱いが容易になり、磁芯部材１３をフィルム又はシート１２の他方の主面に積層接着するだけの簡単な作業でアンテナコイルを得ることができ、磁芯部材の外周面に導線を巻回する従来の図５に示すアンテナコイルに比較して量産性を向上させることができる。
【０００８】
請求項４に係る発明は、請求項１ないし３いずれかに係る発明であって、磁芯部材１３が、軟磁性金属，アモルファス又はフェライトからなる粉末又はフレーク及びプラスチックの複合材、軟磁性金属の板又は箔、アモルファス箔又はその積層材、フェライト、或いは電気絶縁フィルム又はシートに磁性粉を含むインク又は塗料を塗布乾燥することにより形成された磁性塗膜であるタグ用アンテナコイルである。
請求項４に係るタグ用アンテナコイルでは、磁芯部材１３が比較的薄いものになり、アンテナコイルの厚さ方向の大部分を占める磁芯部材１３を薄くすることにより、アンテナコイル全体の厚さを薄くすることができる。
【０００９】
請求項５に係る発明は、請求項３に係る発明であって、磁芯部材１３が、電気絶縁フィルム又はシート１２の他方の主面に磁性粉を含むインク又は塗料を塗布乾燥することにより形成された磁性塗膜であるタグ用アンテナコイルである。
請求項５に係るタグ用アンテナコイルでは、射出成形や圧縮成形において成形が困難な０．８ｍｍ以下の厚さの磁芯部材１３を得ることができ、アンテナコイルの厚さを極めて薄く形成することができる。また、物品に取付けた場合のアンテナコイルの物品から突出量を著しく抑制することができる。
【００１１】
請求項６に係る発明は、物品１８に取付けられる請求項１ないし５いずれか記載のアンテナコイル１０と、アンテナコイル１０に電気的に接続されかつ物品１８毎に異なる固有の情報が記憶されたＩＣチップとを備えたＲＦＩＤ用タグであって、物品１８とコイル本体１１ａの間に磁芯部材１３が介在するようにアンテナコイル１０が物品１８に取付けられることを特徴とするＲＦＩＤ用タグである。
この請求項６に係るＲＦＩＤ用タグは、磁芯部材１３を物品１８に接する側に配置すると、コイル本体１１ａに流れる電流により生じる磁束がその磁芯部材１３を主に通過して、物品１８を通過することが少なくなる。このため、アンテナコイル１０は物品１８が金属であるか否かに係わらず、その影響を受けることが少なくなり、このアンテナコイル１０を用いたＲＦＩＤタグは確実に動作する。
【００１２】
【発明の実施の形態】
次に本発明の第１の実施の形態を図面に基づいて説明する。
図１及び図２に示すように、本発明のタグ用アンテナコイル１０は、平面内で渦巻き状に巻回された導体１１からなるコイル本体１１ａと、そのコイル本体１１ａの片面に接着された板状又はシート状の磁芯部材１３とを備える。この実施の形態におけるコイル本体１１ａは、電気絶縁フィルム又はシート１２の一方の主面に導体１１を渦巻き状に巻回することにより形成され、電気絶縁フィルム又はシート１２としてはポリエチレンテレフタレート（ＰＥＴ）又はポリイミドからなる電気絶縁性のフィルム又はシート１２が用いられる。導体１１の形成は、電気絶縁フィルム又はシート１２の一方の主面に接着された導電性箔を所定のパターンでエッチングする若しくは打ち抜くことにより、又は電気絶縁フィルム又はシート１２の一方の主面に導電材料を所定のパターンでスクリーン印刷若しくは蒸着することにより形成することができる。
【００１３】
エッチングにより導体１１をフィルム１２に形成する手順を説明すると、先ず、このフィルム１２の一方の主面の全面に銅箔を貼り合わせたものを用意する。この銅箔に耐エッチング塗料をシルクスクリーン法により印刷する。銅箔における耐エッチング塗料の印刷は、一連の導体１１によるコイル本体１１ａを形成する必要があることから、中心から矩形又は円形の渦巻き状に塗布される。その後この耐エッチング塗料を乾燥させて耐エッチング塗料が塗布されていない銅箔をエッチング除去し、耐エッチング塗料が塗布された銅箔部分をフィルムの一方の主面上に残存させる。その後耐エッチング塗料をその銅箔上から除去することによりそのフィルム１２の一方の主面に残存した銅箔からなる導体１１を形成する。ここで、図１及び図２におけるフィルム１２の一方の主面における耐エッチング塗料は中心から円形の渦巻き状に塗布されるので、フィルム１２の一方の主面に形成された導体１１は中心から円形の渦巻き状に形成されたコイル本体１１ａを有する。このエッチングによると導体１１を電気絶縁フィルム１２又は電気絶縁シートの一方の主面に比較的容易かつ安価に形成することができる。
【００１４】
一方、磁芯部材１３は、板状又はシート状の軟磁性金属により形成されるか、或いは、軟磁性金属，アモルファス又はフェライトからなる粉末又はフレークとプラスチックとの複合材により形成することができる。また、磁芯部材１３は、Ｆｅ系アモルファス合金（アライドケミカル社製のＭＥＴＧＬＡＳ ２６０５Ｓ−２）やＣｏ系アモルファス合金（アライドケミカル社製のＭＥＴＧＬＡＳ ２７１２Ａ）等のアモルファス箔又はその積層材により形成されたものであってもよく、板状又はシート状に形成されたフェライトであっても良い。
【００１５】
複合材におけるプラスチックとしては加工性の良い熱可塑性のプラスチックを用いたり、或いは耐熱性の良い熱硬化性のプラスチックを用いたりすることができる。この場合の上記軟磁性金属の粉末としては、カーボニル鉄粉末，鉄−パーマロイ等のアトマイズ粉末，還元鉄粉末等が用いられる。一方、軟磁性金属のフレークとしては、上記粉末をボールミル等で微細化して粉末を成形した後に、この粉末を機械的に扁平化して得られたフレークや、鉄系又はコバルト系アモルファス合金の溶湯粒を水冷銅に衝突させて得られたフレークが用いられる。
【００１６】
また磁芯部材１３が複合材により形成される場合、その複合材を射出成形又は圧縮成形することにより磁芯部材１３を形成することができる。このように形成された磁芯部材１３は脆弱なフェライトにより形成された磁芯部材と比較して、強靱であるため薄くしても割れ難いものになる。また軟磁性金属，アモルファス又はフェライトからなる粉末又はフレークがプラスチックに分散されて、プラスチックにより相互に絶縁されているため、全体としては導電性を有せず、高周波の電波を受けても渦電流は発生しない磁芯部材１３が得られる。
ここで、本発明のタグ用アンテナコイル１０は、磁芯部材１３と、導体１１を有する電気絶縁フィルム又はシート１２とによりその厚さが定められる。このため、極力薄いアンテナコイル１０を得るために、その厚さ方向の大部分を占めることになる磁芯部材１３は極力薄く形成されることが望ましい。具体的に上記複合材により得られるシート状の磁芯部材１３を用いる場合には、その厚さが０．１〜１ｍｍであることが好ましい。
【００１７】
図１及び図２における磁芯部材１３は複合材を長円状に射出成形したシート状のものが用いられ、この磁芯部材１３は電気絶縁フィルム１２の他方の主面に接着される。磁芯部材１３の電気絶縁フィルム１２の他方の主面への接着は、磁芯部材１３及び電気絶縁フィルム１２のいずれか一方又は双方に接着剤を塗布し、その後電気絶縁フィルム１２の他方の主面に磁芯部材１３を積層させることにより接着する。この積層接着は磁芯部材１３がコイル本体１１ａの一部を横断するように行われ、コイル本体１１ａにより包囲される中央部１１ｂに磁芯部材１３の一端１３ａが位置し、磁芯部材１３の他端１３ｂがコイル本体１１ａの外部に位置するように接着される。
【００１８】
図１に示すように、この実施の形態におけるアンテナコイル１０は、シート状又は板状の導電部材１６がコイル本体１１ａの片面に接着される。具体的に、導電部材１６は、電気絶縁フィルム又はシート１２の他方の主面に接着された磁芯部材１３を覆うように、その電気絶縁フィルム又はシート１２の他方の主面に接着される。導電部材１６は銅又はアルミニウム等の導電性材料から成り、磁芯部材１３が導電性を有する場合には、間に絶縁フィルムを介して積層接着される。導電部材１６の厚さは０．０１ｍｍ〜５ｍｍであることが好ましい。導電部材１６の厚さを０．０１〜５ｍｍにすることにより、導電部材１６と導体１１との間隔が開き、導体１１により形成されたコイル本体１１ａのＱ値を向上させてアンテナコイル１０としての性能を向上させることができる。また、導電部材１６の幅１ｃｍ長さ１ｃｍの電気抵抗は５Ω以下であることが好ましい。
【００１９】
このように構成されたアンテナコイル１０は、その厚さが極めて薄く形成できる。またこの薄さのため、このアンテナコイル１０を物品１８に取付けても、アンテナコイル１０が物品１８から殆ど突出することはない。また、磁芯部材１３がコイル本体１１ａの一部を横断してコイル本体１１ａの片面に積層されるので、導体１１により形成されたコイル本体１１ａに流れる電流により生じる磁束はその磁芯部材１３を通過し、この磁芯部材１３を通過する磁束は図１の実線矢印で示すようなループを描く。このため、このタグ用アンテナコイル１０を物品１８の表面に取付けても、その磁束方向は図１の矢印で示すような物品１８の表面と平行になり、物品１８が金属により形成されていても、物品１８に生じる渦電流は抑制されてアンテナコイル１０の共振周波数は上記金属製の物品の影響を受けず、このアンテナコイル１０は確実に作動する。
【００２０】
特にこの実施の形態では、電気絶縁フィルム１２の一方の主面全体に接着された導電性箔を所定のパターンでエッチングすることによりコイル本体１１ａを形成したので、その電気絶縁フィルム１２に図示しないＩＣチップ又は共振用のコンデンサを搭載してコイル本体１１ａに接続するだけでＲＦＩＤ用タグ又はＥＡＳ用タグを比較的容易に得ることができる。また、このアンテナコイル１０にＩＣチップを接続したＲＦＩＤ用タグにあっては、物品１８とコイル本体１１ａの間に磁芯部材１６が介在するようにアンテナコイル１０を物品１８に取付ると、コイル本体１１ａに流れる電流により生じる磁束がその磁芯部材１３を主に通過して、物品１８を通過することが少なくなる。更に、この実施の形態では、導電部材１６を電気絶縁フィルム又はシート１２の他方の主面に磁芯部材１３を覆うように積層接着したので、導電部材１６が物品への電波の通過を遮蔽することになる。従って、アンテナコイル１０は物品１８が金属であるか否かに係わらず、その影響を受けることが少なくなり、物品の表面が金属により形成されていても、その金属面に生じる渦電流等による損失は発生せず、ＲＦＩＤ用タグは、物品１８の金属で形成された部分に取付けても確実に動作することになる。
【００２１】
また、このアンテナコイル１０では、電気絶縁フィルム又はシート１２の一方の主面にコイル本体１１ａを一連の導体１１により形成するので、その取り扱いが容易になり、電気絶縁フィルム又はシート１２の他方の主面に磁芯部材１３を積層接着するだけの簡単な作業でアンテナコイル１０を得ることができ、磁芯部材の外周面に導線を巻回して導体を製作する従来のアンテナコイルに比較して量産性を向上させることができる。
【００２２】
なお、上述した実施の形態では、軟磁性金属，複合材、軟磁性金属の板又は箔、アモルファス箔又はその積層材、或いはフェライトからなる磁芯部材１３を説明したが、磁芯部材１３は図示しないが絶縁性樹脂フィルム又はシートと、この絶縁性樹脂フィルム又はシートの表面に形成された磁性塗膜とを備えるものであっても良い。ここで磁性塗膜を形成する際の絶縁性樹脂フィルム又はシートの厚さは１０〜１００μｍであることが好ましく、更に好ましくは２０〜４０μｍである。この絶縁性樹脂フィルム又はシートとその表面に形成された磁性塗膜からなる磁芯部材では、絶縁性樹脂フィルム又はシートの表面に磁性材料からなる粉末又はフレークを含む塗料を塗布乾燥することにより作られ、射出成形において成形が困難な０．８ｍｍ以下の厚さの磁芯部材１３を得ることができ、更に薄いアンテナコイル１０を得ることができる。
【００２３】
次に、図３及び図４に本発明の第２の実施の形態を示す。図面中上述した実施の形態と同一符号は同一部品を示し、繰り返しての説明を省略する。
この実施の形態では、矩形の渦巻き状に巻回されたコイル本体１１ａが導体１１により電気絶縁フィルム１２の一方の主面に形成される。この実施の形態における導体１１は、電気絶縁フィルム１２の一方の主面にＣｕ，Ａｌ，Ｚｎ等の導電材料を矩形の渦巻き状にスクリーン印刷又は蒸着することにより形成される。印刷又は蒸着して導体１１を電気絶縁フィルム１２の一方の主面に形成することにより、比較的多くの生産を比較的安価に行うことが可能になる。
【００２４】
電気絶縁フィルム１２の他方の主面には、磁性材料からなる粉末又はフレークを含む塗料がコイル本体１１ａの一部を横断するように塗布される。その塗料の塗布は、一端１３ａがコイル本体１１ａにより包囲される中央部１１ｂに位置し、他端１３ｂがコイル本体１１ａの外部に位置するように行われ、その後乾燥することにより磁芯部材１３を構成する磁性塗膜が形成される。このようにして形成された磁性塗膜からなる磁芯部材１３はフィルム又はシート１２の他方の主面に積層される。
【００２５】
ここで塗料に含ませる磁性材料の粉末としては、カーボニル鉄粉末，鉄−パーマロイ等のアトマイズ粉末，還元鉄粉末等が用いられる。一方、磁性材料のフレークとしては、上記粉末をボールミル等で微細化して粉末を成形した後に、この粉末を機械的に扁平化して得られたフレークや、鉄系又はコバルト系アモルファス合金の溶湯粒を水冷銅に衝突させて得られたフレークが用いられる。また形成された磁性塗膜の厚さは１０〜８００μｍが好ましく、更に好ましくは３０〜３００μｍである。なお、塗料を一度塗布しただけでは所定の厚さが得られない場合には、繰り返し同一の塗料を塗布乾燥することにより所望の厚さの塗膜を得ることができる。この磁性塗膜は磁芯部材１３としての役割を果たし、塗料を塗布乾燥させるだけの簡単な作業で磁性塗膜からなる磁芯部材１３を有するタグ用アンテナコイル１０が得られる。
【００２６】
このように構成されたアンテナコイル１０は、磁性塗膜からなる磁芯部材１３を有するので、射出成形において成形が困難な０．８ｍｍ以下の厚さの磁芯部材１３を得ることが可能になり、その厚さを更に薄くすることができる。このため、磁束方向が物品表面と平行であって、物品から殆ど突出することのないアンテナコイル１０を得ることができる。また、磁芯部材１３が電気絶縁フィルム１２又はシートに塗布形成された磁性塗膜からなるので、前述した実施の形態における磁芯部材１３を接着する工程を省くことができ、更に簡単な作業でアンテナコイル１０を得ることができ、アンテナコイル１０の量産性を更に向上させることができる。更に、塗料を塗布乾燥させることにより磁性塗膜を形成するので、その塗料に磁性材料からなるフレークを含ませた場合には、そのフレークを絶縁性樹脂フィルム１２又はシートの表面に平行に配置すれば、磁芯部材１３の特性を向上させることも可能になる。
【００２７】
なお、上述した実施の形態では、電気絶縁性フィルム１２の一方の主面に導体を渦巻き状に巻回してコイル本体を形成したが、コイル本体は、導体が平面内で渦巻き状に巻回された状態を維持できる限り、電気絶縁性フィルム上に形成されることを必要としない。具体的に、コイル本体は、表面が絶縁層にて被覆された導線を平面内で渦巻き状に巻回したもの、又はアルミニウムシートや銅板等の導電性板材を打抜き加工することにより平面内で渦巻き状に巻回された導体からなるものであっても良い。
【００２８】
【実施例】
次に本発明の実施例を比較例とともに詳しく説明する。
＜比較例１＞
電気絶縁フィルムの一方の主面に導体によりコイル本体が形成されたアンテナコイルを得た。電気絶縁フィルムとしては、厚さ５０μｍであって縦及び横がそれぞれ５０ｍｍのポリイミドフィルムを用いた。このポリイミドフィルムの一方の主面に厚さ３５μｍの銅箔を積層接着し、この銅箔をエッチングすることによりポリイミドフィルムの一方の主面に４回矩形の渦巻き状に巻回されたコイル本体を一連の導体により形成した。導体は０．８ｍｍの幅に形成され、この導体により形成されるコイル本体の外形は１８ｍｍ×４７ｍｍになるように形成した。この電気絶縁フィルムに設けられた導体のみからなるアンテナコイルを比較例１とした。
【００２９】
＜実施例１＞
比較例１と同一の電気絶縁フィルムに比較例１と同一の手順により比較例１と同一の導体による同一のコイル本体を形成した。また、別に磁性フレークを含むインクを準備し、そのインクを電気絶縁フィルムの他の主面に塗布乾燥させ、コイル本体により包囲される中央部に一端が位置しコイル本体の一部を横断して他端がコイル本体の外部に位置する磁芯部材をコイル本体の片面である電気絶縁フィルムの他の主面に形成した。このようにして磁性塗膜からなる磁芯部材をコイル本体の片面に有するアンテナコイルを実施例１とした。
【００３０】
＜実施例２＞
比較例１と同一の電気絶縁フィルムに比較例１と同一の手順により比較例１と同一の導体による同一のコイル本体を形成した。また、別に、厚さが２０μｍであって、外形が１０ｍｍ×６０ｍｍのアモルファス箔を４枚積層したアモルファス箔の積層材からなる磁芯部材を準備した。その磁芯部材を電気絶縁フィルムの他の主面に接着し、磁芯部材をコイル本体の片面に有するアンテナコイルを得た。磁芯部材の接着は、コイル本体により包囲される中央部に一端が位置しコイル本体の一部を横断して他端がコイル本体の外部に位置するように行った。このようにしてアモルファス箔の積層材からなる磁芯部材をコイル本体の片面に有するアンテナコイルを実施例２とした。
【００３１】
＜実施例３＞
比較例１と同一の電気絶縁フィルムに比較例１と同一の手順により比較例１と同一の導体による同一のコイル本体を形成した。また、別に、厚さが０．８７ｍｍであって、外形が３５ｍｍ×５２ｍｍの複合材からなる磁芯部材を準備した。この複合材は軟磁性金属である粒状鉄粉とプラスチックから成り，その複合材からなる磁芯部材を電気絶縁フィルムの他の主面に接着し、磁芯部材をコイル本体の片面に有するアンテナコイルを得た。磁芯部材の接着は、コイル本体により包囲される中央部に一端が位置しコイル本体の一部を横断して他端がコイル本体の外部に位置するように行った。このようにして複合材からなる磁芯部材をコイル本体の片面に有するアンテナコイルを実施例３とした。
【００３２】
＜比較試験＞
比較例１及び実施例１〜３のアンテナコイルのコイル本体を形成する導体の両端部（図４のＸ及びＹ）に、コイル特性を測定する測定器（HEWLETT PACKARD社製 ４３９５）の測定用ターミナルを接続させ、その測定器により所定の周波数に対するコイル本体のＬ値並びにＱ値をそれぞれ測定した。
また、物品として、１００ｍｍ×１００ｍｍであって厚さが０．１６ｍｍのアルミニウム板を準備した。比較例１及び実施例１〜３のコイル本体を形成する導体の両端部（図４のＸ及びＹ）にそれぞれＩＣチップを接続し、このＩＣチップとアンテナコイルにより１３．５６ＭＨｚで作動するタグとした。このタグを上述したアルミニウム板の表面にそれぞれ配置した場合の動作の有無を確認した。これらの結果を表１にそれぞれ示す。
【００３３】
【表１】

Figure 0004196554
【００３４】
表１から明らかなように、実施例１〜３では比較例１に比較してＱ値が向上していることが判る。これは磁芯部材の有無に起因するものと考えられる。また、実施例１〜３のアンテナコイルにＩＣチップを接続したタグは、アルミニウム板の表面に配置しても動作するのに対して、比較例１のアンテナコイルにＩＣチップを接続したタグは動作しなかった。これは実施例１〜３におけるアンテナコイルでは、コイルから発生する磁束の方向が板の面に平行になり、その磁束がアルミニウム板の表面に達することによる渦電流の発生が抑制されたためと考えられる。一方、比較例１では磁束の方向が板の面に垂直であって、磁束の大部分がアルミニウム板に到達することにより、アンテナコイルのＬ値が変化し、共振周波数が変化したことと、エネルギーが鉄板に吸収され損失となったためと考えられる。
【００３５】
【発明の効果】
以上述べたように、本発明によれば、平面内で渦巻き状に巻回された導体からなるコイル本体と、コイル本体により包囲される中央部に一端が位置しコイル本体の一部を横断して他端がコイル本体の外部に位置するようにコイル本体の片面に接着された板状又はシート状の磁芯部材とを備えたので、アンテナコイルの薄さを維持しつつそのＱ値を高めることができる。また、導体により形成されたコイル本体に流れる電流により生じる磁束はその磁芯部材を通過し、その磁束方向は物品の表面と平行になり、物品の金属により形成されている表面にこのタグ用アンテナコイルを取付けても、その物品表面の金属に生じる渦電流は抑制され、金属製の物品に密着させても確実に作動するアンテナコイルが得られる。
【００３６】
また、電気絶縁フィルム又はシートの一方の主面に導体１１を渦巻き状に巻回してコイル本体を形成し、他方の主面に磁芯部材を積層すれば、比較的簡単な作業でアンテナコイルを得ることができ、磁芯部材の外周面に導線を巻回する従来の図５に示すアンテナコイルに比較して量産性を向上させることができる。そして、電気絶縁フィルム又はシートの他方の主面に磁性粉を含むインク又は塗料を塗布乾燥することにより磁芯部材を形成すれば、射出成形や圧縮成形において成形が困難な０．８ｍｍ以下の厚さの磁芯部材を得ることができ、アンテナコイルの厚さを極めて薄く形成することができる。このため、物品に取付けた場合のアンテナコイルの物品から突出量を著しく抑制することができる。
【００３７】
更に、磁芯部材を物品に接する側に配置すると、コイル本体に流れる電流により生じる磁束がその磁芯部材を主に通過して、物品を通過することが少なくなる。また、シート状又は板状の導電部材をコイル本体の片面に磁芯部材を覆うように接着すれば、導体により形成されたコイル本体と物品と間にその導電部材が介在することになるので、その導電部材が物品への電波の通過を遮蔽する。このため、物品の表面が金属により形成されていても、その金属面に生じる渦電流等による損失は発生しない。この結果、アンテナコイルを確実に動作させることができる。
【図面の簡単な説明】
【図１】本発明第１実施形態のアンテナコイルを示す図２のＡ−Ａ線断面図。
【図２】そのアンテナコイルの平面図。
【図３】本発明第２実施形態のアンテナコイルを示す図１に対応する断面図。
【図４】そのアンテナコイルの平面図。
【図５】磁芯部材に螺旋状に巻回された導体を有する従来のアンテナコイルを示す斜視図。
【図６】渦巻き状の渦巻き部からなる従来のアンテナコイルを示す斜視図。
【符号の説明】
１０ タグ用アンテナコイル
１１ 導体
１１ａ コイル本体
１１ｂ 中央部
１２ 電気絶縁フィルム又はシート
１３ 磁芯部材
１３ａ 一端
１３ｂ 他端
１６ 導電部材
１８ 物品[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antenna coil used for an identification tag using RFID (Radio Frequency Identification) technology or EAS (Electronic Article Sureillannce) technology.
[0002]
[Prior art]
Conventionally, an identification tag in which an IC chip storing information in an antenna coil or a resonance capacitor is electrically connected is known as a tag using RFID technology or EAS technology. These identification tags activate the tag by transmitting a radio wave of a predetermined frequency from the transmission / reception antenna of the interrogator to the antenna coil, and read information stored in the IC chip in response to a read command by radio wave data communication. Or an article configured to identify or monitor the article depending on whether or not it resonates with a radio wave of a specific frequency.
[0003]
As a conventional antenna coil used for these identification tags, a conductor wire whose surface is covered with an insulating layer is wound in a substantially square spiral shape and attached to a base plate, or FIG. As shown, a conductive layer such as an aluminum foil or a copper foil laminated on a base plate 1 is formed by etching to form a substantially square spiral part 2.
As another antenna coil, an antenna coil having a magnetic core member 6 formed in a plate shape or a columnar shape as shown in FIG. 5 and a conductor 7 spirally wound around the magnetic core member 6 is provided. It has been known.
[0004]
[Problems to be solved by the invention]
However, in the antenna coil shown in FIG. 6, the magnetic flux is generated in a direction vertically penetrating the base plate 1 as shown by the arrows in the figure. The transmitted radio wave penetrates the base plate 1 and further penetrates the metal article. For this reason, an eddy current is generated in the metal portion by the penetrating magnetic flux, and the eddy current affects the antenna coil so that it does not operate normally. Further, even if it operates, there is a problem that the loss increases and the working distance of the antenna coil is remarkably shortened.
[0005]
On the other hand, in the antenna coil shown in FIG. 5, the magnetic flux is generated in the axial direction of the magnetic core member 6 as shown by the arrow in the figure. Therefore, even if this antenna coil is attached to a metal article, it is transmitted toward the antenna coil. 5 is expected to operate normally without penetrating the metal article, but the antenna coil shown in FIG. 5 is manufactured by winding the conductor 7 around the outer peripheral surface of the magnetic core member 6. Therefore, the winding operation is relatively complicated and lacks mass productivity. Further, the entire antenna coil becomes relatively thick, and when this antenna coil is attached to the surface of the article, there is a problem that the antenna coil protrudes relatively large from the article.
An object of the present invention is to provide an antenna coil for a tag that can be reliably operated even when it is brought into close contact with a metal article while keeping the thickness thin, and an RFID tag using the tag antenna coil.
Another object of the present invention is to provide a tag antenna coil suitable for mass production and an RFID tag using the same.
[0006]
[Means for Solving the Problems]
  As shown in FIGS. 1 and 2, the invention according to claim 1 includes a coil body 11a made of a conductor 11 wound spirally in a plane, and a central portion 11b surrounded by the coil body 11a at one end 13a. And a plate-like or sheet-like magnetic core member 13 bonded to one surface of the coil body 11a so that the other end 13b is located outside the coil body 11a while crossing a part of the coil body 11a.A sheet-like or plate-like conductive member 16 bonded so as to cover the magnetic core member 13 on one side of the coil body 11a;An antenna coil for tags, comprising:
  In the tag antenna coil according to the first aspect, since the magnetic core member 13 is bonded across a part of the coil body 11a, the Q value of the antenna coil can be increased. Further, the magnetic flux generated by the current flowing in the coil body 11a formed by the conductor 11 passes through the magnetic core member 13 and draws a loop as shown by the solid line arrow in FIG. For this reason, the direction of the magnetic flux is parallel to the surface of the article, and even if this tag antenna coil is attached to the surface formed by the metal of the article, the eddy current generated in the metal on the article surface is suppressed. The coil works reliably.
  Further, since the conductive member 16 is interposed between the coil body 11a formed of the conductor 11 and the article, the conductive member 16 shields the passage of radio waves to the article, so that the surface of the article is made of metal. However, it can operate reliably without any loss due to eddy current or the like generated on the metal surface.
[0007]
The invention according to claim 2 is the invention according to claim 1, wherein the coil body 11a is a tag antenna coil formed by punching a conductive plate or foil.
In the tag antenna coil according to the second aspect, the coil body 11a can be easily formed, and the productivity of the antenna coil can be improved.
The invention according to claim 3 is the invention according to claim 1, wherein the conductive foil adhered to the entire main surface of one of the electrical insulating films or sheets 12 is etched in a predetermined pattern, or is electrically insulated. This is a tag antenna coil in which a coil body 11a is formed by screen-printing or vapor-depositing a conductive material in a predetermined pattern on one main surface of a film or sheet 12.
In the tag antenna coil according to the third aspect, since the conductor 11 is provided on the electrical insulating film 12 or sheet, the handling becomes easy, and the magnetic core member 13 is simply laminated and adhered to the other main surface of the film or sheet 12. Thus, the antenna coil can be obtained by the simple operation, and the mass productivity can be improved as compared with the conventional antenna coil shown in FIG. 5 in which a conducting wire is wound around the outer peripheral surface of the magnetic core member.
[0008]
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the magnetic core member 13 is made of a soft magnetic metal, a powder or flake made of amorphous or ferrite, and a composite material of plastic and soft magnetic metal. It is a tag antenna coil which is a magnetic coating film formed by applying and drying ink or paint containing magnetic powder on a plate or foil, amorphous foil or laminated material thereof, ferrite, or an electrical insulating film or sheet.
In the tag antenna coil according to claim 4, the magnetic core member 13 is relatively thin, and the thickness of the entire antenna coil is reduced by thinning the magnetic core member 13 occupying most of the antenna coil in the thickness direction. Can be made thinner.
[0009]
The invention according to claim 5 is the invention according to claim 3, wherein the magnetic core member 13 is formed by applying and drying ink or paint containing magnetic powder on the other main surface of the electrical insulating film or sheet 12. It is the antenna coil for tags which is a magnetic coating film.
In the tag antenna coil according to claim 5, the magnetic core member 13 having a thickness of 0.8 mm or less that is difficult to be molded by injection molding or compression molding can be obtained, and the thickness of the antenna coil is extremely thin. Can do. Further, the amount of protrusion of the antenna coil from the article when attached to the article can be remarkably suppressed.
[0011]
  Claim 6The invention according to claim 1 is attached to the article 18.5An RFID tag comprising any one of the antenna coils 10 and an IC chip that is electrically connected to the antenna coil 10 and stores unique information different for each article 18, wherein the article 18 and the coil body 11 a The RFID tag is characterized in that the antenna coil 10 is attached to the article 18 so that the magnetic core member 13 is interposed therebetween.
  thisClaim 6In the RFID tag according to the present invention, when the magnetic core member 13 is disposed on the side in contact with the article 18, the magnetic flux generated by the current flowing through the coil body 11 a mainly passes through the magnetic core member 13 and passes through the article 18. Less. Therefore, the antenna coil 10 is less affected by the article 18 regardless of whether or not the article 18 is a metal, and the RFID tag using the antenna coil 10 operates reliably.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the tag antenna coil 10 of the present invention includes a coil body 11a composed of a conductor 11 wound in a spiral shape in a plane, and a plate bonded to one side of the coil body 11a. Or a sheet-like magnetic core member 13. The coil body 11a in this embodiment is formed by winding the conductor 11 in a spiral on one main surface of an electrical insulating film or sheet 12, and the electrical insulating film or sheet 12 is made of polyethylene terephthalate (PET) or An electrically insulating film or sheet 12 made of polyimide is used. The conductor 11 is formed by etching or punching a conductive foil bonded to one main surface of the electrical insulating film or sheet 12 in a predetermined pattern, or conductive on one main surface of the electrical insulating film or sheet 12. The material can be formed by screen printing or vapor deposition in a predetermined pattern.
[0013]
The procedure for forming the conductor 11 on the film 12 by etching will be described. First, a film in which a copper foil is bonded to the entire surface of one main surface of the film 12 is prepared. An etching resistant paint is printed on the copper foil by a silk screen method. Printing of the etching resistant paint on the copper foil is applied in a rectangular or circular spiral shape from the center because it is necessary to form the coil body 11a by the series of conductors 11. Thereafter, the etching resistant paint is dried to remove the copper foil not coated with the etching resistant paint, and the copper foil portion coated with the etching resistant paint is left on one main surface of the film. Thereafter, the etching resistant paint is removed from the copper foil to form the conductor 11 made of the copper foil remaining on one main surface of the film 12. Here, since the etching resistant paint on one main surface of the film 12 in FIGS. 1 and 2 is applied in a circular spiral shape from the center, the conductor 11 formed on one main surface of the film 12 is circular from the center. The coil body 11a is formed in a spiral shape. According to this etching, the conductor 11 can be formed relatively easily and inexpensively on one main surface of the electrical insulating film 12 or the electrical insulating sheet.
[0014]
On the other hand, the magnetic core member 13 can be formed of a plate-like or sheet-like soft magnetic metal, or can be formed of a composite of powder or flakes made of soft magnetic metal, amorphous or ferrite, and plastic. The magnetic core member 13 is formed of an amorphous foil such as an Fe-based amorphous alloy (METGLAS 2605S-2 manufactured by Allied Chemical Co.) or a Co-based amorphous alloy (METGLAS 2712A manufactured by Allied Chemical Co.) or a laminated material thereof. It may be a ferrite formed in a plate shape or a sheet shape.
[0015]
As the plastic in the composite material, a thermoplastic plastic having good processability can be used, or a thermosetting plastic having good heat resistance can be used. As the soft magnetic metal powder in this case, carbonyl iron powder, atomized powder such as iron-permalloy, reduced iron powder, and the like are used. On the other hand, as flakes of soft magnetic metal, the above powder is refined with a ball mill or the like and then formed into powder, and then the powder is obtained by mechanically flattening the powder or molten particles of iron-based or cobalt-based amorphous alloy. Flakes obtained by impinging on water-cooled copper are used.
[0016]
When the magnetic core member 13 is formed of a composite material, the magnetic core member 13 can be formed by injection molding or compression molding the composite material. The magnetic core member 13 formed in this way is tougher than a magnetic core member formed of fragile ferrite, so it is difficult to crack even if it is thin. Also, since powders or flakes made of soft magnetic metal, amorphous or ferrite are dispersed in plastic and insulated from each other by plastic, they do not have electrical conductivity as a whole, and eddy currents are not affected by high-frequency radio waves. A magnetic core member 13 that does not occur is obtained.
Here, the thickness of the tag antenna coil 10 of the present invention is determined by the magnetic core member 13 and the electrical insulating film or sheet 12 having the conductor 11. For this reason, in order to obtain the antenna coil 10 that is as thin as possible, it is desirable that the magnetic core member 13 that occupies most of the thickness direction be formed as thin as possible. Specifically, when the sheet-like magnetic core member 13 obtained from the composite material is used, the thickness is preferably 0.1 to 1 mm.
[0017]
The magnetic core member 13 in FIGS. 1 and 2 is a sheet-like member obtained by injection-molding a composite material into an oval shape. The magnetic core member 13 is bonded to the other main surface of the electrical insulating film 12. The adhesion of the magnetic core member 13 to the other main surface of the electric insulating film 12 is performed by applying an adhesive to one or both of the magnetic core member 13 and the electric insulating film 12, and then the other main surface of the electric insulating film 12. Bonding is performed by laminating the magnetic core member 13 on the surface. This lamination bonding is performed so that the magnetic core member 13 crosses a part of the coil main body 11a, and one end 13a of the magnetic core member 13 is located in the central portion 11b surrounded by the coil main body 11a. The other end 13b is bonded so as to be located outside the coil body 11a.
[0018]
As shown in FIG. 1, in the antenna coil 10 according to this embodiment, a sheet-like or plate-like conductive member 16 is bonded to one side of a coil body 11a. Specifically, the conductive member 16 is bonded to the other main surface of the electric insulating film or sheet 12 so as to cover the magnetic core member 13 bonded to the other main surface of the electric insulating film or sheet 12. The conductive member 16 is made of a conductive material such as copper or aluminum. When the magnetic core member 13 has conductivity, the conductive member 16 is laminated and bonded via an insulating film therebetween. The thickness of the conductive member 16 is preferably 0.01 mm to 5 mm. By setting the thickness of the conductive member 16 to 0.01 to 5 mm, the gap between the conductive member 16 and the conductor 11 is increased, and the Q value of the coil body 11a formed by the conductor 11 is improved, so that the antenna coil 10 is formed. Performance can be improved. The electrical resistance of the conductive member 16 having a width of 1 cm and a length of 1 cm is preferably 5Ω or less.
[0019]
The antenna coil 10 thus configured can be formed to be extremely thin. Further, due to this thinness, even when the antenna coil 10 is attached to the article 18, the antenna coil 10 hardly protrudes from the article 18. In addition, since the magnetic core member 13 is laminated on one side of the coil body 11a across a part of the coil body 11a, the magnetic flux generated by the current flowing in the coil body 11a formed by the conductor 11 causes the magnetic core member 13 to flow. The magnetic flux passing through the magnetic core member 13 draws a loop as shown by the solid line arrow in FIG. Therefore, even if the tag antenna coil 10 is attached to the surface of the article 18, the direction of the magnetic flux is parallel to the surface of the article 18 as shown by the arrow in FIG. 1, and the article 18 is made of metal. The eddy current generated in the article 18 is suppressed, and the resonance frequency of the antenna coil 10 is not affected by the metal article, and the antenna coil 10 operates reliably.
[0020]
In particular, in this embodiment, the coil body 11a is formed by etching the conductive foil bonded to the entire main surface of the electrical insulating film 12 with a predetermined pattern. An RFID tag or an EAS tag can be obtained relatively easily by simply mounting a chip or a resonance capacitor and connecting it to the coil body 11a. Further, in the RFID tag in which the IC chip is connected to the antenna coil 10, when the antenna coil 10 is attached to the article 18 so that the magnetic core member 16 is interposed between the article 18 and the coil body 11a, the coil The magnetic flux generated by the current flowing through the main body 11a mainly passes through the magnetic core member 13 and less passes through the article 18. Furthermore, in this embodiment, since the conductive member 16 is laminated and bonded to the other main surface of the electrical insulating film or sheet 12 so as to cover the magnetic core member 13, the conductive member 16 shields the passage of radio waves to the article. It will be. Therefore, the antenna coil 10 is less likely to be affected regardless of whether or not the article 18 is a metal, and even if the surface of the article is made of metal, loss due to eddy currents or the like generated on the metal surface. Therefore, even if the RFID tag is attached to a portion of the article 18 made of metal, the RFID tag operates reliably.
[0021]
Moreover, in this antenna coil 10, since the coil main body 11a is formed by the series of conductors 11 on one main surface of the electric insulating film or sheet 12, the handling becomes easy, and the other main electric film or sheet 12 is main. The antenna coil 10 can be obtained by a simple operation by simply laminating and bonding the magnetic core member 13 to the surface, and is mass-produced in comparison with a conventional antenna coil in which a conductor is wound around the outer peripheral surface of the magnetic core member. Can be improved.
[0022]
In the above-described embodiment, the magnetic core member 13 made of soft magnetic metal, composite material, soft magnetic metal plate or foil, amorphous foil or laminated material thereof, or ferrite has been described. However, an insulating resin film or sheet and a magnetic coating film formed on the surface of the insulating resin film or sheet may be provided. Here, the thickness of the insulating resin film or sheet when forming the magnetic coating film is preferably 10 to 100 μm, and more preferably 20 to 40 μm. In the magnetic core member comprising the insulating resin film or sheet and the magnetic coating film formed on the surface thereof, the surface of the insulating resin film or sheet is prepared by applying and drying a coating material containing powder or flakes made of a magnetic material. Thus, it is possible to obtain a magnetic core member 13 having a thickness of 0.8 mm or less, which is difficult to be molded by injection molding, and to obtain a thinner antenna coil 10.
[0023]
Next, FIGS. 3 and 4 show a second embodiment of the present invention. In the drawings, the same reference numerals as those in the above-described embodiment denote the same parts, and repeated description will be omitted.
In this embodiment, a coil body 11 a wound in a rectangular spiral shape is formed on one main surface of the electrical insulating film 12 by the conductor 11. The conductor 11 in this embodiment is formed by screen-printing or vapor-depositing a conductive material such as Cu, Al, Zn or the like on one main surface of the electrical insulating film 12 in a rectangular spiral shape. By forming the conductor 11 on one main surface of the electrical insulating film 12 by printing or vapor deposition, a relatively large amount of production can be performed at a relatively low cost.
[0024]
On the other main surface of the electrical insulating film 12, a coating material containing powder or flakes made of a magnetic material is applied so as to cross a part of the coil body 11a. The coating is performed such that one end 13a is positioned at the central portion 11b surrounded by the coil main body 11a and the other end 13b is positioned outside the coil main body 11a, and then the magnetic core member 13 is dried. A magnetic coating film is formed. The magnetic core member 13 made of the magnetic coating film thus formed is laminated on the other main surface of the film or sheet 12.
[0025]
Here, as the powder of the magnetic material included in the paint, carbonyl iron powder, atomized powder such as iron-permalloy, reduced iron powder, and the like are used. On the other hand, as flakes of magnetic material, flakes obtained by refining the above powder with a ball mill or the like and molding the powder and then mechanically flattening the powder, or molten particles of iron-based or cobalt-based amorphous alloy Flakes obtained by colliding with water-cooled copper are used. Moreover, 10-800 micrometers is preferable and, as for the thickness of the formed magnetic coating film, More preferably, it is 30-300 micrometers. In addition, when a predetermined thickness cannot be obtained only by applying a coating material once, a coating film having a desired thickness can be obtained by repeatedly applying and drying the same coating material. The magnetic coating film serves as the magnetic core member 13, and the tag antenna coil 10 having the magnetic core member 13 made of the magnetic coating film can be obtained by a simple operation of applying and drying the paint.
[0026]
Since the antenna coil 10 configured as described above has the magnetic core member 13 made of a magnetic coating film, it becomes possible to obtain the magnetic core member 13 having a thickness of 0.8 mm or less that is difficult to be molded by injection molding. The thickness can be further reduced. For this reason, the magnetic flux direction is parallel to the article surface, and the antenna coil 10 that hardly protrudes from the article can be obtained. In addition, since the magnetic core member 13 is made of a magnetic coating film formed on the electrical insulating film 12 or sheet, the step of bonding the magnetic core member 13 in the above-described embodiment can be omitted, and the operation can be simplified. The antenna coil 10 can be obtained, and the mass productivity of the antenna coil 10 can be further improved. Further, since the magnetic coating film is formed by applying and drying the paint, when the paint contains flakes made of a magnetic material, the flakes are arranged in parallel to the surface of the insulating resin film 12 or sheet. In this case, the characteristics of the magnetic core member 13 can be improved.
[0027]
In the above-described embodiment, the coil body is formed by spirally winding the conductor on one main surface of the electrical insulating film 12, but the coil body is wound in a spiral shape in a plane. It is not necessary to be formed on an electrically insulating film as long as it can be maintained. Specifically, the coil body is formed by spirally winding a conductive wire whose surface is covered with an insulating layer in a plane, or by punching a conductive plate material such as an aluminum sheet or a copper plate. It may be made of a conductor wound in a shape.
[0028]
【Example】
Next, examples of the present invention will be described in detail together with comparative examples.
<Comparative Example 1>
An antenna coil having a coil body formed of a conductor on one main surface of the electrical insulating film was obtained. As the electrical insulating film, a polyimide film having a thickness of 50 μm and a length and width of 50 mm each was used. A copper foil having a thickness of 35 μm is laminated and bonded to one main surface of the polyimide film, and this copper foil is etched to form a coil body wound in a rectangular spiral shape four times on one main surface of the polyimide film. Formed with a series of conductors. The conductor was formed to a width of 0.8 mm, and the outer shape of the coil body formed by this conductor was formed to be 18 mm × 47 mm. The antenna coil consisting only of the conductor provided on this electrical insulating film was defined as Comparative Example 1.
[0029]
<Example 1>
The same coil body with the same conductor as that of Comparative Example 1 was formed on the same electrical insulating film as that of Comparative Example 1 by the same procedure as that of Comparative Example 1. Separately, an ink containing magnetic flakes is prepared, and the ink is applied and dried on the other main surface of the electrical insulating film. One end is located in the central portion surrounded by the coil body and crosses a part of the coil body. A magnetic core member having the other end positioned outside the coil body was formed on the other main surface of the electrical insulating film, which is one side of the coil body. Thus, the antenna coil which has the magnetic core member which consists of a magnetic coating film on the single side | surface of a coil main body was made into Example 1. FIG.
[0030]
<Example 2>
The same coil body with the same conductor as that of Comparative Example 1 was formed on the same electrical insulating film as that of Comparative Example 1 by the same procedure as that of Comparative Example 1. Separately, a magnetic core member made of an amorphous foil laminated material in which four amorphous foils having a thickness of 20 μm and an outer shape of 10 mm × 60 mm were prepared was prepared. The magnetic core member was bonded to the other main surface of the electrical insulating film to obtain an antenna coil having the magnetic core member on one side of the coil body. Adhesion of the magnetic core member was performed such that one end was located in the central portion surrounded by the coil body, a part of the coil body was crossed, and the other end was located outside the coil body. Thus, the antenna coil which has the magnetic core member which consists of a laminated material of an amorphous foil on the single side | surface of a coil main body was made into Example 2. FIG.
[0031]
<Example 3>
The same coil body with the same conductor as that of Comparative Example 1 was formed on the same electrical insulating film as that of Comparative Example 1 by the same procedure as that of Comparative Example 1. Separately, a magnetic core member made of a composite material having a thickness of 0.87 mm and an outer shape of 35 mm × 52 mm was prepared. This composite material is composed of granular iron powder, which is a soft magnetic metal, and plastic, and a magnetic core member made of the composite material is bonded to the other main surface of the electrical insulating film, and the antenna coil has the magnetic core member on one side of the coil body. Got. Adhesion of the magnetic core member was performed such that one end was located in the central portion surrounded by the coil body, a part of the coil body was crossed, and the other end was located outside the coil body. An antenna coil having a magnetic core member made of a composite material on one side of the coil body in this manner was designated as Example 3.
[0032]
<Comparison test>
Measuring terminal of a measuring instrument (4395 manufactured by HEWLETT PACKARD) at both ends (X and Y in FIG. 4) of the conductor forming the coil body of the antenna coil of Comparative Example 1 and Examples 1 to 3 Were connected, and the L value and Q value of the coil body with respect to a predetermined frequency were measured by the measuring instrument.
Also, an aluminum plate having a size of 100 mm × 100 mm and a thickness of 0.16 mm was prepared as an article. An IC chip is connected to both ends (X and Y in FIG. 4) of the conductor forming the coil body of Comparative Example 1 and Examples 1 to 3, respectively, and a tag operating at 13.56 MHz with this IC chip and an antenna coil did. The presence / absence of operation in the case where each of the tags was placed on the surface of the aluminum plate was confirmed. These results are shown in Table 1, respectively.
[0033]
[Table 1]
Figure 0004196554
[0034]
As can be seen from Table 1, in Examples 1 to 3, the Q value is improved as compared with Comparative Example 1. This is considered due to the presence or absence of the magnetic core member. In addition, the tag in which the IC chip is connected to the antenna coil of Examples 1 to 3 operates even when it is disposed on the surface of the aluminum plate, whereas the tag in which the IC chip is connected to the antenna coil of Comparative Example 1 operates. I didn't. This is considered to be because in the antenna coils in Examples 1 to 3, the direction of the magnetic flux generated from the coil is parallel to the surface of the plate, and the generation of eddy current due to the magnetic flux reaching the surface of the aluminum plate is suppressed. . On the other hand, in Comparative Example 1, the direction of the magnetic flux is perpendicular to the plane of the plate, and when the majority of the magnetic flux reaches the aluminum plate, the L value of the antenna coil changes, the resonance frequency changes, and the energy This is thought to be because the iron plate absorbed the loss.
[0035]
【The invention's effect】
As described above, according to the present invention, a coil body made of a conductor wound spirally in a plane, and one end is located in the central portion surrounded by the coil body and crosses a part of the coil body. And a plate-like or sheet-like magnetic core member bonded to one side of the coil body so that the other end is located outside the coil body, so that the Q value is increased while maintaining the thinness of the antenna coil. be able to. The magnetic flux generated by the current flowing in the coil body formed by the conductor passes through the magnetic core member, the direction of the magnetic flux is parallel to the surface of the article, and the tag antenna is formed on the surface of the article formed by the metal. Even if the coil is attached, the eddy current generated in the metal on the surface of the article is suppressed, and an antenna coil that operates reliably even when it is brought into close contact with the metal article can be obtained.
[0036]
Further, if the conductor 11 is spirally wound on one main surface of the electrical insulating film or sheet to form a coil body, and the magnetic core member is laminated on the other main surface, the antenna coil can be formed with a relatively simple operation. As compared with the conventional antenna coil shown in FIG. 5 in which a conducting wire is wound around the outer peripheral surface of the magnetic core member, mass productivity can be improved. Then, if the magnetic core member is formed by applying and drying ink or paint containing magnetic powder on the other main surface of the electrical insulating film or sheet, a thickness of 0.8 mm or less that is difficult to mold in injection molding or compression molding. Can be obtained, and the thickness of the antenna coil can be made extremely thin. For this reason, the protrusion amount from the article of the antenna coil when attached to the article can be remarkably suppressed.
[0037]
Further, when the magnetic core member is disposed on the side in contact with the article, the magnetic flux generated by the current flowing through the coil body mainly passes through the magnetic core member and is less likely to pass through the article. Also, if the sheet-like or plate-like conductive member is bonded to one side of the coil body so as to cover the magnetic core member, the conductive member will be interposed between the coil body formed by the conductor and the article, The conductive member shields the passage of radio waves to the article. For this reason, even if the surface of the article is made of metal, loss due to eddy currents or the like generated on the metal surface does not occur. As a result, the antenna coil can be reliably operated.
[Brief description of the drawings]
1 is a cross-sectional view taken along line AA of FIG. 2 showing an antenna coil according to a first embodiment of the present invention.
FIG. 2 is a plan view of the antenna coil.
FIG. 3 is a cross-sectional view corresponding to FIG. 1 showing an antenna coil according to a second embodiment of the present invention.
FIG. 4 is a plan view of the antenna coil.
FIG. 5 is a perspective view showing a conventional antenna coil having a conductor spirally wound around a magnetic core member.
FIG. 6 is a perspective view showing a conventional antenna coil including a spiral part.
[Explanation of symbols]
10 Antenna coil for tag
11 Conductor
11a Coil body
11b Central part
12 Electrical insulation film or sheet
13 Magnetic core member
13a one end
13b The other end
16 Conductive member
18 Goods

Claims (6)

平面内で渦巻き状に巻回された導体(11)からなるコイル本体(11a)と、
前記コイル本体(11a)により包囲される中央部(11b)に一端(13a)が位置し前記コイル本体(11a)の一部を横断して他端(13b)が前記コイル本体(11a)の外部に位置するように前記コイル本体(11a)の片面に接着された板状又はシート状の磁芯部材(13)と、
前記コイル本体 (11a) の片面に前記磁芯部材 (13) を覆うように接着されたシート状又は板状の導電部材 (16) と
を備えたことを特徴とするタグ用アンテナコイル。A coil body (11a) comprising a conductor (11) spirally wound in a plane;
One end (13a) is located in the central portion (11b) surrounded by the coil body (11a), crosses a part of the coil body (11a), and the other end (13b) is outside the coil body (11a). and one side is bonded a plate-like or sheet-like magnetic core member of the coil body (11a) so as to be located (13),
Tag antenna coil, characterized in that a said coil body sheet or plate-shaped conductive member (16) bonded to cover the magnetic core member (13) on one side of (11a). コイル本体(11a)が導電性板又は箔を打ち抜くことにより形成された請求項１記載のタグ用アンテナコイル。  The tag antenna coil according to claim 1, wherein the coil body (11a) is formed by punching a conductive plate or foil. 電気絶縁フィルム又はシート(12)の一方の主面全体に接着された導電性箔を所定のパターンでエッチングすることにより、又は電気絶縁フィルム又はシート(12)の一方の主面に導電材料を所定のパターンでスクリーン印刷若しくは蒸着することにより、コイル本体が形成された請求項１記載のタグ用アンテナコイル。  Conductive foil adhered to one entire main surface of the electrical insulating film or sheet (12) is etched in a predetermined pattern, or a conductive material is predetermined on one main surface of the electrical insulating film or sheet (12). The tag antenna coil according to claim 1, wherein the coil main body is formed by screen printing or vapor deposition with the pattern. 磁芯部材(13)が、軟磁性金属，アモルファス又はフェライトからなる粉末又はフレーク及びプラスチックの複合材、軟磁性金属の板又は箔、アモルファス箔又はその積層材、フェライト、或いは電気絶縁フィルム又はシートに磁性粉を含むインク又は塗料を塗布乾燥することにより形成された磁性塗膜である請求項１ないし３いずれか記載のタグ用アンテナコイル。  The magnetic core member (13) is a composite of powder or flakes and plastic made of soft magnetic metal, amorphous or ferrite, soft magnetic metal plate or foil, amorphous foil or laminated material thereof, ferrite, or electrical insulating film or sheet. The tag antenna coil according to any one of claims 1 to 3, which is a magnetic coating film formed by applying and drying ink or paint containing magnetic powder. 磁芯部材(13)が、電気絶縁フィルム又はシート(12)の他方の主面に磁性粉を含むインク又は塗料を塗布乾燥することにより形成された磁性塗膜である請求項３記載のタグ用アンテナコイル。  The tag core according to claim 3, wherein the magnetic core member (13) is a magnetic coating film formed by applying and drying ink or paint containing magnetic powder on the other main surface of the electrical insulating film or sheet (12). Antenna coil. 物品(18)に取付けられる請求項１ないし５いずれか記載のアンテナコイル(10)と、前記アンテナコイル(10)に電気的に接続されかつ前記物品(18)毎に異なる固有の情報が記憶されたＩＣチップとを備えたＲＦＩＤ用タグであって、
前記物品(18)とコイル本体(11a)の間に磁芯部材(13)が介在するように前記アンテナコイル(10)が前記物品に取付けられることを特徴とするＲＦＩＤ用タグ。The antenna coil (10) according to any one of claims 1 to 5, which is attached to an article (18), and unique information which is electrically connected to the antenna coil (10) and is different for each article (18) is stored. RFID tag comprising an IC chip,
The RFID tag, wherein the antenna coil (10) is attached to the article such that a magnetic core member (13) is interposed between the article (18) and a coil body (11a).
JP2001303050A 2001-09-28 2001-09-28 Tag antenna coil and RFID tag using the same Expired - Fee Related JP4196554B2 (en)

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JP2001303050A JP4196554B2 (en) 2001-09-28 2001-09-28 Tag antenna coil and RFID tag using the same
CNA028234596A CN1871743A (en) 2001-09-28 2002-09-26 Antenna coil and RFID-use tag using it, transponder-use antenna
KR10-2004-7004371A KR20040037127A (en) 2001-09-28 2002-09-26 Antenna coil and rfid-use tag using it, transponder-use antenna
US10/490,704 US7088304B2 (en) 2001-09-28 2002-09-26 Antenna coil, and RFID-use tag using it, transponder-use antenna
PCT/JP2002/009955 WO2003030300A1 (en) 2001-09-28 2002-09-26 Antenna coil and rfid-use tag using it, transponder-use antenna
EP02800249A EP1439608A4 (en) 2001-09-28 2002-09-26 Antenna coil and rfid-use tag using it, transponder-use antenna
TW091122383A TW589765B (en) 2001-09-28 2002-09-27 Antenna coil and RFID, transponder antenna using the same

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