WO2006008869A1 - Loop antenna for wireless ic tag reading and writing - Google Patents

Loop antenna for wireless ic tag reading and writing Download PDF

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Publication number
WO2006008869A1
WO2006008869A1 PCT/JP2005/008855 JP2005008855W WO2006008869A1 WO 2006008869 A1 WO2006008869 A1 WO 2006008869A1 JP 2005008855 W JP2005008855 W JP 2005008855W WO 2006008869 A1 WO2006008869 A1 WO 2006008869A1
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WIPO (PCT)
Prior art keywords
wireless
tag
antenna
loop
loop antenna
Prior art date
Application number
PCT/JP2005/008855
Other languages
French (fr)
Japanese (ja)
Inventor
Sumiko Minami
Mutsumi Kubo
Original Assignee
Kobe Tsushin Kogyo Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Kobe Tsushin Kogyo Kabushiki Kaisha filed Critical Kobe Tsushin Kogyo Kabushiki Kaisha
Publication of WO2006008869A1 publication Critical patent/WO2006008869A1/en

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a non-contact type loop antenna for reading information on a wireless IC tag (RFID tag) or writing information on the wireless IC tag by an electromagnetic induction action, and more particularly to a wireless IC tag.
  • the present invention relates to a loop antenna that can be read and written regardless of the mounting posture.
  • This system includes a wireless IC tag having an IC chip power provided with an antenna and a reader / writer device provided with a loop antenna for communication with the wireless IC tag, and uses the antenna of the reader / writer device.
  • the reader / writer device and the wireless IC tag communicate with each other and exchange data!
  • the wireless IC tag when the wireless IC tag enters the RF field generated by the reader / writer device, power is supplied to the wireless IC tag by the RF signal, and the command data and the wireless IC tag are transmitted. .
  • the wireless IC tag transmits its own ID and data, and the reader / writer device receives the transmitted ID and data, and sends the received data to the computer.
  • the computer determines the next action based on the data and issues a command to the reader / writer.
  • the reader / writer sends data to the wireless IC tag.
  • the wireless IC tag is attached to the appropriate place of the article to be conveyed, and the appropriate place on the carrying line. Is provided with a loop antenna as a reader / writer antenna. The directionality of the loop antenna and the IC card side loop antenna of the wireless IC tag is important in order to transmit and receive signals to and from each other for electromagnetic induction.
  • Patent Document 1 JP 2002-279362 A Disclosure of the invention
  • the present invention has been proposed in view of the above points, and normal communication can be performed regardless of the direction of the three-dimensional direction of the antenna surface of the wireless IC tag attached to the article.
  • the purpose is to provide an antenna.
  • the present invention forms a loop shape by electromagnetically coupling the farthest part of the crossing partial force in the figure 8 antenna line in parallel, and the inside is formed. It is formed in the passage space of the wireless IC tag! /
  • a single antenna wire is shaped like an eight, and the portion farthest from the intersection is arranged in parallel and electromagnetically coupled to form a loop antenna formed of double antenna wires. Since the current flowing through a pair of antenna wires arranged on the same surface flows in the opposite direction, the magnetic field is superimposed and the magnetic field is not weakened. Normal communication can be performed with a single loop antenna with a simple configuration regardless of the direction of the dimension.
  • FIG. 1 is a schematic configuration diagram.
  • FIG. 2 is a perspective view of the antenna portion taken out.
  • Fig. 3 is a development view of the antenna portion.
  • FIG. 1 shows an embodiment of the present invention
  • FIG. 1 is a schematic configuration diagram
  • FIG. 2 is an exploded perspective view of an antenna portion
  • FIG. 3 is a development view of the antenna portion.
  • the reader / writer system using the wireless IC tag includes a transport device (1) such as a belt conveyor, a loop antenna (2) disposed in the transport path of the transport device (1), and a reader / writer not shown. It consists of a device.
  • the article (3) conveyed by the conveying device (1) is provided with a wireless IC tag (4).
  • the loop antenna (2) is connected to the reader / writer device (not shown) in the vicinity of the intersection (6) of the approximately 8-shaped antenna wire (5).
  • the one where the output terminals (7) and (8) are arranged is bent. This bending position is the edge located at the farthest part from the intersection (6) of the antenna wire (5) formed in the shape of figure 8 and the intersection (6) of the figure 8 antenna wire (5). It is set near the middle part (11X12) between the part (9X10) and the intersecting part (6) and one edge part (9).
  • both end edge portions (9) and (10) that are arranged close to each other are positioned in parallel and electrically insulated. It is electromagnetically coupled (13) in the state. As a result, the rectangular loop surface (14) is formed in a state where the front and rear sides are juxtaposed.
  • this edge part (9) ( In 10) since the edge part (9X10) located farthest from the intersection (6) of the 8-shaped antenna line is placed in parallel and electromagnetically coupled, this edge part (9) ( In 10), a pair of parallel line portions are formed, and a magnetic field is generated as the third axis.
  • the loop antenna (2) is arranged such that a pair of parallel line portions are disposed on each peripheral side wall portion of the rectangular tube (15) disposed in a state in which the transfer device (1) passes therethrough. Yes.
  • the conveyor belt of the transport device (1) is disposed so as to penetrate through the space surrounded by the antenna wires (5).
  • the wireless IC tag affixed to the article (3) Communicating with the wireless IC tag (4) to read the data recorded in the wireless IC tag (4) and write new data to the wireless IC tag (4).
  • the antenna surface of the wireless IC tag (4) is X direction with the article moving direction in the transport device (1) as the X direction, the width direction of the belt conveyor as the Y direction, and the height direction as the Z direction.
  • the Z direction Regardless of the direction of the Z plane, YZ plane, or X—Y plane, communication with the loop surface formed by the loop antenna (2) for the reader / writer is possible.
  • the bending force also bends the 8-shaped antenna line to form a loop antenna in which two rectangular loop planes are positioned in parallel! /, So that the two antenna lines flow on the same plane. Since the current flows in the opposite direction, the magnetic field is superimposed, and reading and writing can be performed in a wide range without insensitive areas that do not weaken the magnetic field.
  • the present invention can be used for a production management system in a factory, a distribution system in a distribution stage, a product confirmation at the time of import / export, and a brand product confirmation system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Credit Cards Or The Like (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

An antenna capable of normal communication regardless of which direction an antenna surface of a wireless IC tag attached to an article faces. A loop antenna (2) for a reader/writer, communicating with a wireless IC tag (4) to read information of the tag (4) and write information in the tag (4). Those portions of a figure- 8-shaped antenna wire (5) which are the furthest from an intersection (6) are parallelly arranged and electromagnetically coupled (13) to form the antenna in a loop shape, and the inside of the loop is formed as a space for the tag to pass through.

Description

明 細 書  Specification
無線 ICタグの読書き用ループアンテナ  Loop antenna for reading and writing wireless IC tags
技術分野  Technical field
[0001] 本発明は、電磁誘導作用によリ、無線 ICタグ (RFIDタグ)の情報を読み取り、又は 無線 ICタグに情報を書き込むための非接触型のループアンテナに関し、特に、無線 ICタグの取り付け姿勢にかかわらず読み書きできるループアンテナに関する。  TECHNICAL FIELD [0001] The present invention relates to a non-contact type loop antenna for reading information on a wireless IC tag (RFID tag) or writing information on the wireless IC tag by an electromagnetic induction action, and more particularly to a wireless IC tag. The present invention relates to a loop antenna that can be read and written regardless of the mounting posture.
背景技術  Background art
[0002] 従来、無線 ICタグを用いたリーダライタシステムとしては、 13. 56MHzの周波数帯 による交通カードシステム、物流システム、物品の管理システムが実用化されている。 このシステムは、アンテナを備えた ICチップ力 なる無線 ICタグと、この無線 ICタグと の通信を行うためのループアンテナが備えられているリーダライタ装置とを備え、リー ダライタ装置のアンテナを利用してリーダライタ装置と無線 ICタグとは交信してデータ のやり取りを行うようになって!/ヽる。  Conventionally, as a reader / writer system using a wireless IC tag, a traffic card system, a distribution system, and an article management system using a frequency band of 13.56 MHz have been put into practical use. This system includes a wireless IC tag having an IC chip power provided with an antenna and a reader / writer device provided with a loop antenna for communication with the wireless IC tag, and uses the antenna of the reader / writer device. The reader / writer device and the wireless IC tag communicate with each other and exchange data!
[0003] この場合、無線 ICタグがリーダライタ装置が発生させる RFフィールド内に入ってくる と、 RF信号により、無線 ICタグにパワーが供給されるとともに、コマンドデータも無線 I Cタグも伝達される。一方無線 ICタグは自身が持つ IDとデータとを送信し、リーダライ タ装置は、無線 ICタグ力 送信された IDとデータとを受信し、その受信したデータを コンピュータに送る。コンピュータでは、そのデータに基づき次のアクションを決定、リ 一ダライタに命令を出す。リーダライタはデータを無線 ICタグに送信する。  In this case, when the wireless IC tag enters the RF field generated by the reader / writer device, power is supplied to the wireless IC tag by the RF signal, and the command data and the wireless IC tag are transmitted. . On the other hand, the wireless IC tag transmits its own ID and data, and the reader / writer device receives the transmitted ID and data, and sends the received data to the computer. The computer determines the next action based on the data and issues a command to the reader / writer. The reader / writer sends data to the wireless IC tag.
このような手順を繰り返すことで、無線 ICタグとリーダライタとの間でデータ通信を行 つている。  By repeating these procedures, data communication is performed between the wireless IC tag and the reader / writer.
[0004] 物流システム等への応用の一例では、ベルトコンベア等で搬送される物品の区分 などに用いられるが、その際無線 ICタグは搬送される物品の適所に取り付けられ、搬 送ラインの適所にリーダライタ用アンテナとしてのループアンテナが設けられる。この ループアンテナと無線 ICタグの有する ICカード側ループアンテナとは、電磁誘導作 用に用いて互いに信号を送受するために、それらの方向性が重要となる。  [0004] In an example of application to a logistics system, etc., it is used to classify articles to be conveyed by a belt conveyor, etc. At that time, the wireless IC tag is attached to the appropriate place of the article to be conveyed, and the appropriate place on the carrying line. Is provided with a loop antenna as a reader / writer antenna. The directionality of the loop antenna and the IC card side loop antenna of the wireless IC tag is important in order to transmit and receive signals to and from each other for electromagnetic induction.
特許文献 1：特開 2002— 279362号公報 発明の開示 Patent Document 1: JP 2002-279362 A Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0005] し力しながら、物品に付される無線 ICタグ、即ち ICカード側ループアンテナは物品 の搬送中にあっては、常に同一の方向を向いているという保証はなぐ ICカード側ル ープアンテナのループ面とリーダライタ用ループアンテナのループ面との関係によつ ては、正常な交信が行えなくなるおそれがある。  [0005] However, there is no guarantee that the wireless IC tag attached to the article, that is, the IC card side loop antenna, is always facing the same direction while the article is being conveyed. IC card side loop antenna Depending on the relationship between the loop surface and the loop surface of the reader / writer loop antenna, normal communication may not be possible.
[0006] 本発明は、このような点に鑑み提案されたもので、物品に付される無線 ICタグのァ ンテナ面が 3次元方向のどの方向に向 ヽて ヽても正常な交信のできるアンテナを提 供することを目的とする。  [0006] The present invention has been proposed in view of the above points, and normal communication can be performed regardless of the direction of the three-dimensional direction of the antenna surface of the wireless IC tag attached to the article. The purpose is to provide an antenna.
課題を解決するための手段  Means for solving the problem
[0007] 上述の目的を達成するために本発明は、 8の字状アンテナ線での交差部分力 最 も遠い部分を平行に位置させて電磁結合させることにより、ループ状に形成し、内部 を無線 ICタグの通過空間に形成してあることを特徴として！/、る。 [0007] In order to achieve the above-described object, the present invention forms a loop shape by electromagnetically coupling the farthest part of the crossing partial force in the figure 8 antenna line in parallel, and the inside is formed. It is formed in the passage space of the wireless IC tag! /
発明の効果  The invention's effect
[0008] 本発明は 1本のアンテナ線を 8の字状とし、その交差部分から最も遠い部分を平行 に配置して電磁結合させることにより、二重のアンテナ線で形成されたループ状アン テナとなり、し力も同一面部分に配設される一対のアンテナ線を流れる電流は対向方 向に流れるから、磁界が重畳する方向となり、磁界を弱めることはなくなるから、無線 I Cタグのアンテナ面が 3次元方向のどの方向に向!ヽて ヽても簡単な構成の一本のル ープアンテナで正常な交信を行うことができる。  [0008] According to the present invention, a single antenna wire is shaped like an eight, and the portion farthest from the intersection is arranged in parallel and electromagnetically coupled to form a loop antenna formed of double antenna wires. Since the current flowing through a pair of antenna wires arranged on the same surface flows in the opposite direction, the magnetic field is superimposed and the magnetic field is not weakened. Normal communication can be performed with a single loop antenna with a simple configuration regardless of the direction of the dimension.
図面の簡単な説明  Brief Description of Drawings
[0009] [図 1]図 1は概略構成図である。 FIG. 1 is a schematic configuration diagram.
[図 2]図 2はアンテナ部分の取り出し斜視図である。  FIG. 2 is a perspective view of the antenna portion taken out.
[図 3]図 3はアンテナ部分の展開図である。  [Fig. 3] Fig. 3 is a development view of the antenna portion.
符号の説明  Explanation of symbols
[0010] 2…ループアンテナ、 [0010] 2 ... Loop antenna,
4…無線 ICタグ、 5· ··アンテナ線、 4… Wireless IC tag, 5 ... Antenna wire,
6…交差部分、  6 ... intersection,
13…電磁結合。  13… Electromagnetic coupling.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0011] 図は本発明の一実施形態を示し、図 1は概略構成図、図 2はアンテナ部分の取り出 し斜視図、図 3はアンテナ部分の展開図である。  FIG. 1 shows an embodiment of the present invention, FIG. 1 is a schematic configuration diagram, FIG. 2 is an exploded perspective view of an antenna portion, and FIG. 3 is a development view of the antenna portion.
この無線 ICタグを用いたリーダライタシステムは、ベルトコンベア等の搬送装置 (1)と 、この搬送装置 (1)の搬送経路中に配置したループアンテナ (2)と、図示を省略したリ 一ダライタ装置とで構成してある。そして、搬送装置 (1)で搬送される物品 (3)には無 線 ICタグ (4)が配設されて 、る  The reader / writer system using the wireless IC tag includes a transport device (1) such as a belt conveyor, a loop antenna (2) disposed in the transport path of the transport device (1), and a reader / writer not shown. It consists of a device. The article (3) conveyed by the conveying device (1) is provided with a wireless IC tag (4).
[0012] このループアンテナ (2)は、図 3に示すように、略 8の字状のアンテナ線 (5)での交差 部分 (6)の近傍にリーダライタ装置 (図示略)への入 ·出力端子 (7)(8)とを配置したもの を折り曲げ形成してある。この折り曲げ位置は、 8の字状に形成したアンテナ線 (5)の 交差部分 (6)と、 8の字状アンテナ線 (5)での交差部分 (6)から最遠個所に位置する端 縁部分 (9X10)と交差部分 (6)との両中間部分 (11X12)、及び一方の端縁部分 (9)の近 傍位置に設定してある。  [0012] As shown in Fig. 3, the loop antenna (2) is connected to the reader / writer device (not shown) in the vicinity of the intersection (6) of the approximately 8-shaped antenna wire (5). The one where the output terminals (7) and (8) are arranged is bent. This bending position is the edge located at the farthest part from the intersection (6) of the antenna wire (5) formed in the shape of figure 8 and the intersection (6) of the figure 8 antenna wire (5). It is set near the middle part (11X12) between the part (9X10) and the intersecting part (6) and one edge part (9).
[0013] そして、略 8の字状としたアンテナ線 (5)を折り曲げた際に近接配置される両端縁部 分 (9)(10)は平行に位置しており、電気的に絶縁された状態で電磁結合 (13)させてあ る。これにより矩形のループ面 (14)が前後に並立する状態に形成されることになる。ま た、 8字状アンテナ線の交差部分 (6)から最遠個所に位置する端縁部分 (9X10)を平 行に配置し、電磁結合させていることから、この端縁部分 (9)(10)でも一対の平行線部 分が形成されることになつて、第 3の軸として磁界を発生させることになる。  [0013] Then, when the antenna wire (5) having a substantially 8-character shape is bent, both end edge portions (9) and (10) that are arranged close to each other are positioned in parallel and electrically insulated. It is electromagnetically coupled (13) in the state. As a result, the rectangular loop surface (14) is formed in a state where the front and rear sides are juxtaposed. In addition, since the edge part (9X10) located farthest from the intersection (6) of the 8-shaped antenna line is placed in parallel and electromagnetically coupled, this edge part (9) ( In 10), a pair of parallel line portions are formed, and a magnetic field is generated as the third axis.
[0014] このループアンテナ (2)は、内部に搬送装置 (1)が貫通する状態に配置されている 四角筒 (15)の各周側壁部分にそれぞれ一対の平行線部分が配置されるようにしてあ る。  [0014] The loop antenna (2) is arranged such that a pair of parallel line portions are disposed on each peripheral side wall portion of the rectangular tube (15) disposed in a state in which the transfer device (1) passes therethrough. Yes.
[0015] このように形成したループアンテナ (2)では、搬送装置 (1)のコンベアベルトが各アン テナ線 (5)で囲まれている空間内を貫通する状態に配置し、この各アンテナ線 (5)で 囲まれている空間内を物品 (3)が移動する際に、物品 (3)に貼付されている無線 ICタ グ (4)との間で交信して、無線 ICタグ (4)に記録されているデータを読み取るとともに、 無線 ICタグ (4)に新たなデータを書き込むことになる。 [0015] In the loop antenna (2) formed as described above, the conveyor belt of the transport device (1) is disposed so as to penetrate through the space surrounded by the antenna wires (5). When the article (3) moves in the space surrounded by (5), the wireless IC tag affixed to the article (3) Communicating with the wireless IC tag (4) to read the data recorded in the wireless IC tag (4) and write new data to the wireless IC tag (4).
[0016] そしてこの場合、搬送装置 (1)での物品移動方向を X方向、ベルトコンベアの幅方 向を Y方向、高さ方向を Z方向として、無線 ICタグ (4)のアンテナ面が X— Z平面、 Y Z平面、 X— Y平面の何れの方向に配置されていても、リーダライタ用のループア ンテナ (2)により形成されているループ面との間で正常に交信できることになる。  [0016] In this case, the antenna surface of the wireless IC tag (4) is X direction with the article moving direction in the transport device (1) as the X direction, the width direction of the belt conveyor as the Y direction, and the height direction as the Z direction. — Regardless of the direction of the Z plane, YZ plane, or X—Y plane, communication with the loop surface formed by the loop antenna (2) for the reader / writer is possible.
[0017] し力も、 8の字状アンテナ線を折り曲げて矩形のループ面が 2つ平行に位置するル ープアンテナとして!/、るので、同じ面に位置して 、る 2本のアンテナ線を流れる電流 は対向方向に流れるから、磁界が重畳する方向となり、磁界を弱めることはなぐ不感 領域のな 、広 、範囲での読み書きをすることができる。  [0017] The bending force also bends the 8-shaped antenna line to form a loop antenna in which two rectangular loop planes are positioned in parallel! /, So that the two antenna lines flow on the same plane. Since the current flows in the opposite direction, the magnetic field is superimposed, and reading and writing can be performed in a wide range without insensitive areas that do not weaken the magnetic field.
産業上の利用可能性  Industrial applicability
[0018] 本発明は、工場での生産管理システム、流通段階での配送システム、輸出入時の 商品の確認やブランド商品の確認システムに利用することができる。 The present invention can be used for a production management system in a factory, a distribution system in a distribution stage, a product confirmation at the time of import / export, and a brand product confirmation system.

Claims

請求の範囲 The scope of the claims
[1] 無線 ICタグと交信を行って、無線 ICタグの情報を読み取り、または無線 ICタグに情 報を書き込むリーダライタ用のループアンテナであって、  [1] A loop antenna for a reader / writer that communicates with a wireless IC tag and reads information from the wireless IC tag or writes information to the wireless IC tag.
8の字状アンテナ線の交差部分力 最も遠い部分を平行に位置させて電磁結合さ せることにより、ループ状に形成し、内部を無線 ICタグの通過空間に形成してあること を特徴とする無線 ICタグの読書き用ループアンテナ。  Crossing force of 8-shaped antenna line The farthest part is placed in parallel and electromagnetically coupled to form a loop and the inside is formed in the wireless IC tag passage space Loop antenna for reading and writing wireless IC tags.
[2] 8の字状アンテナ線の交差部分を含む個所と、交差部分力 最も離れた位置まで の両中間部と、交差部分からの最遠位置での一方の個所とで折り曲げることで矩形 のループ面を構成した請求項 1に記載の無線 ICタグの読書き用ループアンテナ。 [2] A rectangular shape is formed by bending at the location including the intersection of the 8-shaped antenna line, the middle portion of the intersection portion force farthest away, and one location at the farthest position from the intersection. The loop antenna for reading and writing the wireless IC tag according to claim 1, wherein the loop surface is configured.
PCT/JP2005/008855 2004-07-22 2005-05-16 Loop antenna for wireless ic tag reading and writing WO2006008869A1 (en)

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JP2004213891A JP4035524B2 (en) 2004-07-22 2004-07-22 Loop antenna for reading and writing wireless IC tags
JP2004-213891 2004-07-22

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JPH11316807A (en) * 1998-05-07 1999-11-16 Omron Corp Data communication equipment
JP2000105800A (en) * 1998-09-29 2000-04-11 Toshiba Corp Radio communication medium processor

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