JP2009165061A - Document management system - Google Patents
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- JP2009165061A JP2009165061A JP2008002972A JP2008002972A JP2009165061A JP 2009165061 A JP2009165061 A JP 2009165061A JP 2008002972 A JP2008002972 A JP 2008002972A JP 2008002972 A JP2008002972 A JP 2008002972A JP 2009165061 A JP2009165061 A JP 2009165061A
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- 239000010409 thin film Substances 0.000 claims abstract description 15
- 230000001629 suppression Effects 0.000 claims abstract description 13
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 20
- 238000010168 coupling process Methods 0.000 abstract description 20
- 238000005859 coupling reaction Methods 0.000 abstract description 20
- 239000010410 layer Substances 0.000 description 24
- 230000000694 effects Effects 0.000 description 7
- 239000012790 adhesive layer Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Abstract
Description
本発明は、ＲＦＩＤタグを使った書類、郵便書留などの管理に関するものであり、ＲＦＩＤタグが貼られた書類、郵便書留などを孤立状態または複数積層状態のいずれの状態においても確実に非接触でデータの読み書きをする書類管理システムに関する。 The present invention relates to management of documents using RFID tags, postal registered mail, etc., and ensures that non-contact or multi-layered documents and postal mails with RFID tags are contactless. The present invention relates to a document management system for reading and writing data.
現在、特許文献１のように、個人情報が記載された各種申込書、企業内の稟議書、保管期限を有する書類、医療カルテなどの書類に、直接または間接的にＲＦＩＤタグを貼り付けてコンピューター管理することが一般的になりつつある。従来、これらの書類の管理では紛失、混入などの問題を抱えており、その改善策の一つがＲＦＩＤタグによる管理であり、ＲＦＩＤタグが持つトレーサビリティの能力を利用して対象書類の追跡が可能となった。 Currently, as in Patent Document 1, a computer in which an RFID tag is pasted directly or indirectly on various application forms containing personal information, internal approval documents, documents with storage deadlines, medical records, etc. It is becoming common to manage. Conventionally, management of these documents has had problems such as loss and mixing, and one of the improvement measures is management by RFID tags, and it is possible to track target documents using the traceability capability of RFID tags. became.
以下に公知文献を記す。
しかし、現状では、１３．５６ＭＨｚの周波数を使ったＩＳＯ１５６９３規格の一般的なＲＦＩＤタグを書類に貼り付けた場合、ＲＦＩＤタグに対するデータの読み取りは一枚一枚行っており、複数積層した状態での一括読み取りは後述の問題から行っていないのが現状である。すなわち、前記ＲＦＩＤタグは、例えば１〜５ｍｍの間隔で５０枚、１００枚といった複数積層状態でのデータの読み取りができない。その要因としてはＲＦＩＤタグ同士の重なりにある。ＲＦＩＤタグ同士が接近した状態で置かれるとそのアンテナ同士が電磁結合することで共振周波数がずれてしまい、共振作用によって電力を供給されて稼動しているＲＦＩＤタグのＩＣチップにおいて、その影響を強く受けたＲＦＩＤタグのＩＣチップでは電力供給が得られなく稼動できない状態になってしまう。よって、外部の読み取り装置からの問い合わせに対して答えられない状況となっている。 However, at present, when a general RFID tag of ISO15693 standard using a frequency of 13.56 MHz is pasted on a document, data is read from the RFID tag one by one, and a plurality of layers are stacked. Currently, batch reading is not performed due to the problems described later. That is, the RFID tag cannot read data in a multi-layered state such as 50 sheets or 100 sheets at an interval of 1 to 5 mm, for example. The factor is the overlap between RFID tags. When the RFID tags are placed close to each other, the antennas are electromagnetically coupled with each other so that the resonance frequency is shifted, and the influence is strongly exerted on the IC chip of the RFID tag that is operated with power supplied by the resonance action. The received IC tag of the RFID tag will not be able to operate because power cannot be supplied. Therefore, the situation is such that an inquiry from an external reader cannot be answered.
このため、アンテナコイルのアンテナデザインを一枚一枚異なる形状にすることで、アンテナ同士の電磁結合を抑え共振周波数のずれを最小にして前述の問題を解決した商品もあるが、画一的なアンテナ形状ではないため生産性に問題がありコストを下げることできず、またアンテナデザインの自由度が下がってしまう小型化には向かないという欠点もある。 For this reason, there is a product that solves the above-mentioned problems by making the antenna coil antenna design different from one piece to another, thereby suppressing electromagnetic coupling between the antennas and minimizing the deviation of the resonance frequency. Since it is not an antenna shape, there is a problem in productivity that the cost cannot be reduced, and there is also a disadvantage that it is not suitable for miniaturization that reduces the degree of freedom in antenna design.
本発明は、かかる従来技術の問題点を解決するものであり、その課題とするところは、ＲＦＩＤタグの貼られた書類などを１〜５ｍｍの間隔で５０枚、１００枚といった複数積層した状態でも安定してデータの読み書きができ、また画一的なアンテナ形状のＲＦＩＤタグが利用でき、かつアンテナコイルの小型化も可能な技術を提供することにある。 The present invention solves the problems of the prior art, and the problem is that even in a state where a plurality of documents with RFID tags attached, such as 50 sheets and 100 sheets at intervals of 1 to 5 mm, are stacked. An object of the present invention is to provide a technology that can stably read and write data, can use an RFID tag with a uniform antenna shape, and can reduce the size of an antenna coil.
本発明は、この課題を解決するために、ＩＣチップとアンテナコイル部を備えるＲＦＩＤタグが書類包に貼られており、前記ＲＦＩＤタグが装置アンテナと非接触で電磁誘導で結合することで前記読み取り装置とデータ通信を行う書類管理システムであって、前記書類包の一辺を書類設置面に突き当てて設置し、前記書類設置面に軸が平行なコイル形状の前記装置アンテナを前記書類設置面の下に設置し、前記書類包の前記一辺付近に、前記アンテナコイル部を設置し、前記アンテナコイル部を、前記一辺から遠い側から前記一辺側
まで３０％以上９０％以下の範囲で、磁性材料層の間に金属薄膜層が設置された層構成の相互干渉抑制部で覆ったことを特徴とする書類管理システムである。
In order to solve this problem, the present invention has an RFID tag including an IC chip and an antenna coil portion attached to a document package, and the RFID tag is coupled to the apparatus antenna by electromagnetic induction in a non-contact manner. A document management system that performs data communication with an apparatus, wherein one side of the document package is placed against a document setting surface, and the device antenna having a coil shape whose axis is parallel to the document setting surface is connected to the document setting surface. The antenna coil portion is installed near the one side of the document package, and the antenna coil portion is placed in a range of 30% to 90% from the side far from the one side to the one side. The document management system is characterized in that it is covered with a mutual interference suppression unit having a layer structure in which a metal thin film layer is provided between the layers.
また、本発明は、上記書類包を上記書類設置面上に複数密着して配置したことを特徴とする上記の書類管理システムである。 The present invention is the document management system described above, wherein a plurality of the document packages are arranged in close contact with the document installation surface.
本発明は以上の構成により、ＲＦＩＤタグの貼られた書類などを１〜５ｍｍの間隔で５０枚、１００枚といった複数積層した状態でも安定してデータの読み書きができる効果があり、また画一的なアンテナ形状のＲＦＩＤタグが利用でき、かつアンテナコイルの小型化も実現できる効果がある。 With the above configuration, the present invention has the effect of being able to read and write data stably even in a state in which a plurality of documents with RFID tags attached, such as 50 sheets or 100 sheets at intervals of 1 to 5 mm, are stacked. An RFID tag having an antenna shape can be used, and the antenna coil can be miniaturized.
以下、本発明の実施の形態を図面に基づいて詳細に説明する。図１に本発明の一実施例である書類管理システムの外観斜視図を示し、図２は、本発明の機能を説明するために図１の一部分を抜き出して描いた透視図である。図１に示すように、書類または書類が入ったフォルダから成る書類包１が積層され、書類包１には、アンテナコイル５を有するＲＦＩＤタグ４が貼られている。この書類包１は、図１および図２に示すように、書類設置面３ａに書類包み１の一辺を突き当てて、書類包１を書類設置面３ａに垂直に立てて置く。その書類１又は書類１が入ったホルダに貼られたＲＦＩＤタグ４のアンテナコイル５の開口面に垂直な方向の軸を左右方向を向かせ、そのアンテナコイル５の軸と平行に左右方向を向く軸、すなわちコイルの軸が書類設置面３ａに平行な装置アンテナ３を、書類設置面３ａの下に多巻き型長方形コイル形状に設置する。この装置アンテナ３は書類設置面３ａを有する書類設置台の中に設置して隠しても良い。その装置アンテナ３にリーダーライター装置２を電気接続し、リーダーライター装置２が、装置アンテナ３とそれに非接触なＲＦＩＤタグ４のアンテナコイル５との電磁誘導による電磁結合７を利用して、積層状態にある書類包１のＲＦＩＤタグ情報を読み込むようにしたシステムである。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an external perspective view of a document management system according to an embodiment of the present invention, and FIG. 2 is a perspective view of a part extracted from FIG. 1 for explaining the function of the present invention. As shown in FIG. 1, a document package 1 including a document or a folder containing documents is stacked, and an RFID tag 4 having an antenna coil 5 is attached to the document package 1. As shown in FIGS. 1 and 2, the document package 1 is placed with the document package 1 standing vertically on the document installation surface 3a with one side of the document package 1 abutting against the document installation surface 3a. The axis in the direction perpendicular to the opening surface of the antenna coil 5 of the RFID tag 4 attached to the document 1 or the holder containing the document 1 is directed to the left-right direction, and is directed to the left-right direction parallel to the axis of the antenna coil 5. The device antenna 3 whose axis, that is, the axis of the coil is parallel to the document setting surface 3a, is installed in a multi-turn rectangular coil shape under the document setting surface 3a. The device antenna 3 may be installed and hidden in a document installation table having a document installation surface 3a. The reader / writer device 2 is electrically connected to the device antenna 3, and the reader / writer device 2 uses the electromagnetic coupling 7 due to electromagnetic induction between the device antenna 3 and the antenna coil 5 of the RFID tag 4 that is not in contact with the device antenna 3. In this system, the RFID tag information of the document package 1 is read.
図２に示すように、書類包１の下部に書類包１の下辺の長さ程度の長さの長方形のアンテナコイル５を有するＲＦＩＤタグ４が貼り付けられ、ＲＦＩＤタグ４のアンテナコイル５の上部には後述する相互干渉抑制部６が貼り付けられている。リーダーライター装置２には装置アンテナ３が接続されており、装置アンテナ３は、図２に示す様に、図２の、書類設置面３ａの下に設置され、軸が書類設置面３ａ方向を向いた多巻き型コイルから成る。この多巻き型コイルは、図２のように、書類設置面３ａの奥行き方向に平行な長辺と、書類設置面３ａに垂直方向の短辺を持つ長方形のコイルである。図２に示すように、書類包１に設置するＲＦＩＤタグ４のアンテナコイル５は、書類設置面３ａの下の装置アンテナ３に近づけて強く電磁結合７させるために書類包１の下部に設置する。すなわち、書類設置面３ａに突き当てる書類包１の一辺側のアンテナコイル５を装置アンテナ３のコイルの長辺に平行に近接させて設置し、そのアンテナコイル５と装置アンテナ３の電磁誘導の電磁結合７により、そのＲＦＩＤタグ４とリーダーライター装置２とデータ通信をおこなう。 As shown in FIG. 2, an RFID tag 4 having a rectangular antenna coil 5 having a length about the length of the lower side of the document package 1 is attached to the lower part of the document package 1, and the upper part of the antenna coil 5 of the RFID tag 4. The mutual interference suppression part 6 mentioned later is affixed on this. A device antenna 3 is connected to the reader / writer device 2, and as shown in FIG. 2, the device antenna 3 is installed under the document setting surface 3a in FIG. 2, and the axis faces the document setting surface 3a. It consists of a multi-winding coil. As shown in FIG. 2, the multi-winding coil is a rectangular coil having a long side parallel to the depth direction of the document setting surface 3a and a short side perpendicular to the document setting surface 3a. As shown in FIG. 2, the antenna coil 5 of the RFID tag 4 installed on the document package 1 is installed at the lower part of the document package 1 so as to be strongly electromagnetically coupled 7 close to the device antenna 3 below the document installation surface 3a. . That is, the antenna coil 5 on one side of the document package 1 that abuts against the document setting surface 3 a is installed in parallel and close to the long side of the coil of the apparatus antenna 3, and electromagnetic induction of electromagnetic induction between the antenna coil 5 and the apparatus antenna 3 is performed. The coupling 7 performs data communication with the RFID tag 4 and the reader / writer device 2.
装置アンテナ３の上の書類設置面３ａに書類包１を置く構造にすることで、書類包１の自重（重力）を利用し、ＲＦＩＤタグ４のアンテナコイル５が装置アンテナ３に近接する位置に自然の配置されるようにする。また、ＲＦＩＤタグ４のアンテナコイル５は、書類設置面３ａの下の長方形の多巻き型コイル状の装置アンテナ３の上辺と平行する長さを長くするために、書類包み１の下辺の長さ程度の長さを有して図２の奥行き方向に長く、上下方向には短い長方形状に形成する。なお、図には示さないが、書類包１と書類設置面３ａと装置アンテナ３との相対的位置関係を同じにして全体を回転させて配向させた構造にしても良い。例えば、装置アンテナ３及び書類設置面３ａを書類包１の後方に立てて置き
、ただし、書類設置面３ａの下側を手前に引き出し、書類設置面３ａの上側を奥に引っ込めて書類設置面３ａを垂直方向から傾けて書類包１の一辺を突き当てて置き、その書類包１の下側の他の辺を、書類設置面３ａに垂直な支え板で、手前が持ち上がり奥が下がった滑り台状の支え板に当てて下から支える構成にしても良い。
By adopting a structure in which the document package 1 is placed on the document setting surface 3 a on the apparatus antenna 3, the antenna coil 5 of the RFID tag 4 is positioned in the vicinity of the apparatus antenna 3 by utilizing the weight (gravity) of the document package 1. To be placed in nature. Further, the antenna coil 5 of the RFID tag 4 has a length of the lower side of the document packet 1 in order to increase the length parallel to the upper side of the rectangular multi-coiled device antenna 3 below the document setting surface 3a. It has a certain length and is formed in a rectangular shape that is long in the depth direction of FIG. 2 and short in the vertical direction. Although not shown in the figure, the relative position of the document package 1, the document setting surface 3a, and the apparatus antenna 3 may be the same, and the entire structure may be rotated and oriented. For example, the device antenna 3 and the document setting surface 3a are placed upright behind the document package 1, except that the lower side of the document setting surface 3a is pulled out and the upper side of the document setting surface 3a is withdrawn to the back, and the document setting surface 3a. Inclined from the vertical direction to place one side of the document package 1 in contact with the other side, the other side of the lower side of the document package 1 is supported by a support plate that is perpendicular to the document installation surface 3a, and a slide-like shape with the front raised and the back lowered. You may make it the structure supported on the support plate from below.
図３は、ＲＦＩＤタグ４の平面図であり、図４は、図３のＡ部分の断面図である。また図５は、ＲＦＩＤタグ４を貼った書類包１の群を、図３のＡ部の軸方向から観察した断面図である。図３から図５のように、ＲＦＩＤタグ４は、基材９と、その上面にアルミニウム、銅などの金属薄膜をエッチング処理して形成したアンテナコイル５を有し、そのアンテナコイル５にはＩＣチップ８が異方性導電接着剤で加熱加圧して実装されている。基材９の裏面には、そのＲＦＩＤタグ４を書類包１に接着するための接着層１４が設けられている。そして、アンテナコイル５の、書類設置面３ａに突き当てた書類包１の一辺から遠い側、すなわち書類包１の上方側の部分から書類設置面３ａ側までのコイルの開口面の面積の半分を覆うように相互干渉抑制部６を貼り付ける。 FIG. 3 is a plan view of the RFID tag 4, and FIG. 4 is a cross-sectional view of a portion A in FIG. FIG. 5 is a cross-sectional view of the group of document packages 1 to which the RFID tag 4 is pasted, observed from the axial direction of part A in FIG. As shown in FIGS. 3 to 5, the RFID tag 4 has a base material 9 and an antenna coil 5 formed by etching a metal thin film such as aluminum or copper on the upper surface thereof. The chip 8 is mounted by heating and pressing with an anisotropic conductive adhesive. An adhesive layer 14 for adhering the RFID tag 4 to the document package 1 is provided on the back surface of the base material 9. Then, half the area of the opening surface of the coil from the antenna coil 5 on the side far from one side of the document package 1 abutted against the document setting surface 3a, that is, the upper part of the document package 1 to the document setting surface 3a side is reduced. The mutual interference suppression part 6 is affixed so that it may cover.
相互干渉抑制部６は、基材９とアンテナコイル５の上面に接着層１３により、基材９側から順に、磁性材料層１２、金属薄膜層１１、磁性材料層１０の順に貼り付けられた、磁性材料層１２と１０の間に金属薄膜層１１が接着層１３で接着されて設置された多層構成の構造体である。 The mutual interference suppression unit 6 was attached to the upper surface of the base material 9 and the antenna coil 5 by the adhesive layer 13 in this order from the base material 9 side in the order of the magnetic material layer 12, the metal thin film layer 11, and the magnetic material layer 10. In this structure, the metal thin film layer 11 is bonded between the magnetic material layers 12 and 10 by the adhesive layer 13 and installed.
従来、ＲＦＩＤタグ４が貼り付けられた書類包１が重ねられると、隣接する書類包１のアンテナコイル５の開口面に垂直な軸同士が重なり合って、アンテナコイル５同士が強く電磁結合２１することでＲＦＩＤタグ４のアンテナコイル５の共振周波数がずれてしまう。そのため、ＲＦＩＤタグ４を装置アンテナ３の発生する電磁界に共振させることで装置アンテナ３から電力を供給されて稼動しているＲＦＩＤタグ４に電力が供給されず、そのようにアンテナコイル５の共振周波数がずれたＲＦＩＤタグ４ではＩＣチップ８が稼動できない状態になってしまう。 Conventionally, when the document package 1 with the RFID tag 4 attached is overlapped, the axes perpendicular to the opening surface of the antenna coil 5 of the adjacent document package 1 overlap each other, and the antenna coils 5 are strongly electromagnetically coupled 21 to each other. As a result, the resonance frequency of the antenna coil 5 of the RFID tag 4 is shifted. Therefore, by resonating the RFID tag 4 with the electromagnetic field generated by the device antenna 3, no power is supplied to the RFID tag 4 that is operating by being supplied with power from the device antenna 3, and thus the resonance of the antenna coil 5 is performed. With the RFID tag 4 whose frequency is shifted, the IC chip 8 cannot be operated.
次に、本発明の課題の解決手段である相互干渉抑制部６の作用について説明する。金属薄膜層１１は、隣接するアンテナコイル５同士の電磁結合２１を発生する磁界を遮断する層であり、この層によってＲＦＩＤタグ４のアンテナコイル５の共振周波数がずれることが抑えられる。 Next, the operation of the mutual interference suppression unit 6 that is a means for solving the problems of the present invention will be described. The metal thin film layer 11 is a layer that blocks a magnetic field that generates the electromagnetic coupling 21 between the adjacent antenna coils 5, and the resonance frequency of the antenna coil 5 of the RFID tag 4 can be suppressed by this layer.
ＲＦＩＤタグ４のアンテナコイル５に、そのアンテナコイル５を跨ぐようにして金属板等が密着して置かれると、コイル電流が流れた場合、金属板に渦電流が発生し、この渦電流により生じる反磁界によってアンテナコイル５内に流れる磁界電流は著しく減衰される。一方、装置アンテナ３から、装置アンテナ３の磁界変動が装置アンテナ３とアンテナコイル５との電磁結合７によりアンテナコイル５に電流を誘導する。金属薄膜層１１よりも内側の磁性材料層１２は、装置アンテナ３からの誘導電流が隣接する金属薄膜層１１に渦電流を発生させて誘導電流が減衰されることを防ぐ効果がある。金属薄膜層１１に接着層１３を介して設置した最外層の磁性材料層１０は、ＲＦＩＤタグ４が積層されて置かれた時、隣のＲＦＩＤタグ４のアンテナコイル５と隣接する位置関係にあり、隣のＲＦＩＤタグ４のアンテナコイル５の電流が、このＲＦＩＤタグの金属薄膜層１１により渦電流を発生して減衰することを防ぎ、隣のＲＦＩＤタグ４のアンテナコイル５の電流の減衰を軽減することを防ぐ効果がある。 When a metal plate or the like is placed in close contact with the antenna coil 5 of the RFID tag 4 so as to straddle the antenna coil 5, when a coil current flows, an eddy current is generated in the metal plate, and the eddy current is generated. The magnetic field current flowing in the antenna coil 5 is significantly attenuated by the demagnetizing field. On the other hand, the magnetic field fluctuation of the device antenna 3 induces a current from the device antenna 3 to the antenna coil 5 by the electromagnetic coupling 7 between the device antenna 3 and the antenna coil 5. The magnetic material layer 12 inside the metal thin film layer 11 has an effect of preventing the induced current from the device antenna 3 from generating an eddy current in the adjacent metal thin film layer 11 to attenuate the induced current. The outermost magnetic material layer 10 installed on the metal thin film layer 11 via the adhesive layer 13 is adjacent to the antenna coil 5 of the adjacent RFID tag 4 when the RFID tag 4 is stacked and placed. The current of the antenna coil 5 of the adjacent RFID tag 4 is prevented from being attenuated by generating an eddy current by the metal thin film layer 11 of the RFID tag, and the current attenuation of the antenna coil 5 of the adjacent RFID tag 4 is reduced. There is an effect to prevent that.
相互干渉抑制部６の内部の金属薄膜層１１によって磁界が遮断されているため、図３に示すように装置アンテナ３が発生する磁界はＲＦＩＤタグ４のアンテナコイル５と、金属薄膜層１１の無い領域２０の範囲でのみ電磁結合する。図２に示すように、装置アンテナ３とアンテナコイル５の電磁結合７はこの領域２０で行われるが、その両アンテナの電磁
結合７に必要な領域の多くが領域２０に含まれるので、両アンテナの電磁結合７はさほど抑制されない。一方、書類包１を隔てて隣接するＲＦＩＤタグ４のアンテナコイル５同士の電磁結合２１は、アンテナコイル５の、金属薄膜層１１の無い領域２０の範囲でしか電磁結合されないので、隣接するアンテナコイル５同士の電磁結合２１が弱まる。そのため、隣接するアンテナコイル５同士の電磁結合２１による共振周波数のずれが抑えられる。ここで、図１の相互干渉抑制部６の長さＬを変え、
電磁結合７の強さ ＞ 電磁結合２１の強さの関係になるよう調整することで、隣接する書類包１のＲＦＩＤタグ４のアンテナコイル５の開口面に垂直な軸同士が重なり合うように書類包１が重なっても、装置アンテナ３とアンテナコイル５の電磁結合７を強くでき安定してデータの読み取りができる効果が得られる。
Since the magnetic field is blocked by the metal thin film layer 11 inside the mutual interference suppression unit 6, the magnetic field generated by the device antenna 3 does not exist in the antenna coil 5 of the RFID tag 4 and the metal thin film layer 11 as shown in FIG. 3. Electromagnetic coupling is performed only in the region 20. As shown in FIG. 2, the electromagnetic coupling 7 between the device antenna 3 and the antenna coil 5 is performed in this area 20, but since most of the area necessary for the electromagnetic coupling 7 of both antennas is included in the area 20, both antennas The electromagnetic coupling 7 is not so suppressed. On the other hand, the electromagnetic coupling 21 between the antenna coils 5 of the RFID tags 4 adjacent to each other with the document package 1 is electromagnetically coupled only within the range 20 of the antenna coil 5 where the metal thin film layer 11 is not present. The electromagnetic coupling 21 between the five is weakened. Therefore, the shift of the resonance frequency due to the electromagnetic coupling 21 between the adjacent antenna coils 5 is suppressed. Here, the length L of the mutual interference suppression unit 6 in FIG.
Strength of Electromagnetic Coupling 7> Document wrapping so that the axes perpendicular to the opening surface of the antenna coil 5 of the RFID tag 4 of the adjacent document wrapping 1 overlap by adjusting the relationship of the strength of the electromagnetic coupling 21. Even if 1 overlaps, the electromagnetic coupling 7 of the apparatus antenna 3 and the antenna coil 5 can be strengthened, and the effect which can read data stably is acquired.
本発明の実験では、ＲＦＩＤタグ４のアンテナコイル５を６０ｍｍ×２０ｍｍの寸法にし、ＩＳＯ１５６９３規格のＩＣチップ８が実装されているＩＣインレットに、多層構造のシート状にした相互干渉抑制部６を、アンテナコイル５の短辺の半分を超える長さＬ＝１５ｍｍの位置まで貼り付けた。このＲＦＩＤタグ４を、書類包１とした１００μｍのＰＥＴシートをに貼り、この書類包１に貼り付けたＲＦＩＤタグ４の間隔を１ｍｍ以下にして、しかも、隣接する書類包１のＲＦＩＤタグ４のアンテナコイル５の開口面に垂直な軸同士が重なり合うようにして、ＲＦＩＤタグ４のデータのリーダーライター装置２による読み取り実験を行った。その結果、安定したデータの読み取りが確認できた。 In the experiment of the present invention, the antenna coil 5 of the RFID tag 4 has a size of 60 mm × 20 mm, and the mutual interference suppression unit 6 in the form of a multilayer structure sheet is provided in an IC inlet in which an IC chip 8 of ISO15693 standard is mounted. The antenna coil 5 was pasted to a position with a length L = 15 mm exceeding half of the short side. The RFID tag 4 is affixed to a 100 μm PET sheet, which is the document package 1, the interval between the RFID tags 4 adhered to the document package 1 is 1 mm or less, and the RFID tag 4 of the adjacent document package 1 An experiment of reading data of the RFID tag 4 by the reader / writer device 2 was performed so that the axes perpendicular to the opening surface of the antenna coil 5 overlap each other. As a result, stable data reading was confirmed.
前述の実験は本発明の一例であり、ＲＦＩＤタグ４のアンテナコイル５の形状、装置アンテナ３の形状および磁力出力、書類包１に貼り付けたＲＦＩＤタグ４の間隔など条件は様々であるが、相互干渉抑制部６がＲＦＩＤタグ４のアンテナコイル５の幅方向で、すなわち、コイルの短辺の方向で、書類設置面３ａに突き当てた書類包１の一辺から遠い側の書類包１の上方側の部分から書類設置面３ａ側までの、アンテナコイル５の開口面の面積の３０％以上９０％以下の範囲の開口面を覆っていればその効果が得られる。 The above experiment is an example of the present invention, and there are various conditions such as the shape of the antenna coil 5 of the RFID tag 4, the shape and magnetic force output of the device antenna 3, and the interval between the RFID tags 4 attached to the document package 1. The mutual interference suppression unit 6 is located in the width direction of the antenna coil 5 of the RFID tag 4, that is, in the direction of the short side of the coil, above the document package 1 far from one side of the document package 1 abutted against the document setting surface 3 a. The effect can be obtained if the opening surface in the range from 30% to 90% of the area of the opening surface of the antenna coil 5 from the side portion to the document setting surface 3a side is covered.
書類包１に貼り付けたＲＦＩＤタグ４の間隔を例えば３ｍｍと固定した場合、ＲＦＩＤタグ４のアンテナコイル５を小型化すると、アンテナコイル５の縦横の寸法に対して相対的に、書類包１のＲＦＩＤタグ４の間隔が広くなる。この場合は、通常サイズのアンテナコイル５の場合と比較すると、隣接する書類包１のＲＦＩＤタグ４のアンテナコイル５同士の電磁結合２１が弱くなる。そのため、アンテナコイル５を小型化することで、隣接するアンテナコイル５同士の電磁結合２１による共振周波数のずれを更に抑えることができる効果がある。このため、アンテナコイル５を小型化できる効果がある。 When the interval between the RFID tags 4 attached to the document package 1 is fixed to 3 mm, for example, when the antenna coil 5 of the RFID tag 4 is downsized, the size of the document package 1 relative to the vertical and horizontal dimensions of the antenna coil 5 is reduced. The interval between the RFID tags 4 becomes wide. In this case, the electromagnetic coupling 21 between the antenna coils 5 of the RFID tags 4 of the adjacent document packages 1 is weaker than in the case of the antenna coil 5 having a normal size. Therefore, by miniaturizing the antenna coil 5, there is an effect that the resonance frequency shift due to the electromagnetic coupling 21 between the adjacent antenna coils 5 can be further suppressed. For this reason, there is an effect that the antenna coil 5 can be reduced in size.
１・・・書類包
２・・・リーダーライター装置
３・・・装置アンテナ
３ａ・・・書類設置面
４・・・ＲＦＩＤタグ
５・・・アンテナコイル
６・・・相互干渉抑制部
７・・・電磁結合
８・・・ＩＣチップ
９・・・基材
１０・・・磁性材料層
１１・・・金属薄膜層
１２・・・磁性材料層
１３・・・接着層
１４・・・接着層
２０・・・領域
２１・・・電磁結合
Ｌ・・・相互干渉抑制部のアンテナコイルの短辺に重なる長さ
DESCRIPTION OF SYMBOLS 1 ... Document package 2 ... Reader writer apparatus 3 ... Apparatus antenna 3a ... Document installation surface 4 ... RFID tag 5 ... Antenna coil 6 ... Mutual interference suppression part 7 ... Electromagnetic coupling 8 ... IC chip 9 ... base 10 ... magnetic material layer 11 ... metal thin film layer 12 ... magnetic material layer 13 ... adhesive layer 14 ... adhesive layer 20 ... Area 21: Electromagnetic coupling L: Length overlapping the short side of the antenna coil of the mutual interference suppression unit
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