JP2006041572A - Loop antenna for reading/writing wireless ic tag - Google Patents

Loop antenna for reading/writing wireless ic tag Download PDF

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JP2006041572A
JP2006041572A JP2004213891A JP2004213891A JP2006041572A JP 2006041572 A JP2006041572 A JP 2006041572A JP 2004213891 A JP2004213891 A JP 2004213891A JP 2004213891 A JP2004213891 A JP 2004213891A JP 2006041572 A JP2006041572 A JP 2006041572A
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tag
wireless
antenna
loop
loop antenna
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JP2004213891A
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JP4035524B2 (en
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Sumiko Minami
須美子 皆見
Mutsumi Kubo
睦 久保
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KOBE TSUSHIN KOGYO KK
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KOBE TSUSHIN KOGYO KK
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Priority to JP2004213891A priority Critical patent/JP4035524B2/en
Priority to PCT/JP2005/008855 priority patent/WO2006008869A1/en
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    • 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

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  • 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

<P>PROBLEM TO BE SOLVED: To provide an antenna capable of making normal communication with a wireless IC tag even when a face of an antenna of the wireless IC tag attached to an object faces any direction in three-dimensional directions. <P>SOLUTION: The loop antenna (2) is used for a reader/writer for making communication with a wireless IC tag (4) to read information of the wireless IC tag (4) and to write information to the wireless IC tag (4). Both ends of an 8-shaped antenna wire (5) of the loop antenna (2) remotest from its crossing part (6) are located in parallel, electromagnetically coupled (13) with each other and formed to be a loop, the inside of the loop is formed for a space through which the wireless IC tag passes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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。     The present invention relates to a non-contact type loop antenna for reading information on a wireless IC tag (RFID tag) or writing information to the wireless IC tag by electromagnetic induction action, and in particular, to a mounting posture of the wireless IC tag. It relates to loop antennas that can read and write regardless.

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チップからなる無線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いる。   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 13.56 MHz frequency band have been put into practical use. This system includes a wireless IC tag including an IC chip provided with an antenna, and a reader / writer device provided with a loop antenna for performing 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 to exchange data.

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ＩＣ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タグから送信された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、リー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。
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っている。 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 ID and data transmitted from the wireless IC tag, 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 transmits data to the wireless IC tag.
By repeating such a procedure, data communication is performed between the wireless IC tag and the reader / writer.

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。
特開２００２−２７９３６２号公報 In an example of an application to a distribution system, etc., it is used for sorting articles conveyed by a belt conveyor, etc., but at that time, a wireless IC tag is attached to an appropriate position of the conveyed article and is used for a reader / writer at an appropriate position on the transfer line. A loop antenna is provided as an antenna. The loop antenna and the IC card-side loop antenna of the wireless IC tag are used for electromagnetic induction to transmit / receive signals to / from each other, and their directivity is important.
JP 2002-279362 A

しかしながら、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く、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っては、正常な交信が行えなくなるおそれがある。   However, there is no guarantee that the wireless IC tag attached to the article, that is, the IC card loop antenna is always in the same direction while the article is being transported, and the loop surface of the IC card loop antenna and the reader are not guaranteed. Depending on the relationship with the loop surface of the writer loop antenna, normal communication may not be possible.

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タグのアンテナ面が３次元方向のどの方向に向いてい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。   The present invention has been proposed in view of the above points, and provides an antenna capable of normal communication regardless of which direction of the three-dimensional direction the antenna surface of a wireless IC tag attached to an article is directed. Objective.

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から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いる。   In order to achieve the above-described object, the present invention forms a loop shape by electromagnetically coupling a portion farthest from the crossing portion of the 8-shaped antenna line in parallel, and the inside of the wireless IC tag is formed. It is formed in the passage space.

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、しか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ＩＣタグのアンテナ面が３次元方向のどの方向に向いてい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。   In the present invention, a single antenna line is shaped like an eight, and the part farthest from the intersection is arranged in parallel and electromagnetically coupled to form a loop antenna formed of double antenna lines. Since the current flowing through the pair of antenna wires arranged on the surface portion flows in the opposite direction, the magnetic field is superimposed and the magnetic field is not weakened. Even if it is facing, normal communication can be performed with a single loop antenna having a simple configuration.

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。
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、図示を省略したリー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)が配設されている FIG. 1 shows an embodiment of the present invention, FIG. 1 is a schematic configuration diagram, FIG. 2 is a perspective view of the antenna portion taken out, and 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 device (not shown). It consists of. And the wireless IC tag (4) is arrange | positioned at the articles | goods (3) conveyed by the conveying apparatus (1).

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(９)(10)と交差部分(６)との両中間部分(11)(12)、及び一方の端縁部分(９)の近傍位置に設定してある。   As shown in FIG. 3, the loop antenna (2) has an input / output terminal (not shown) connected to a reader / writer device (not shown) in the vicinity of the intersection (6) of the approximately 8-shaped antenna line (5). 7) A structure in which (8) is arranged is formed by bending. This bending position is the edge located at the farthest position from the intersection (6) of the antenna line (5) formed in the shape of figure 8 and the intersection (6) of the figure 8 antenna line (5). It is set in the vicinity of both intermediate portions (11) and (12) between the portions (9) and (10) and the intersecting portion (6) and one edge portion (9).

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(９)(10)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って、第３の軸として磁界を発生させることになる。   Further, when the antenna wire (5) having a substantially 8-shaped shape is bent, both end edge portions (9) and (10) which are arranged close to each other are located in parallel and are electromagnetically coupled in an electrically insulated state. (13) Let me. As a result, the rectangular loop surface (14) is formed in a state where the front and rear sides are juxtaposed. Further, since the edge portions (9) and (10) located farthest from the intersection (6) of the 8-shaped antenna line are arranged in parallel and electromagnetically coupled, this edge portion (9) Even in (10), a pair of parallel line portions are formed, and a magnetic field is generated as the third axis.

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。   The loop antenna (2) is arranged such that a pair of parallel line portions are arranged on each peripheral side wall portion of the rectangular tube (15) arranged in a state where the transfer device (1) passes therethrough.

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。   In the loop antenna (2) formed in this way, the conveyor belt of the transport device (1) is arranged so as to penetrate through the space surrounded by each antenna line (5), and each antenna line (5) When the article (3) moves in the enclosed space, it communicates with the wireless IC tag (4) attached to the article (3) and is recorded on the wireless IC tag (4). In addition to reading existing data, new data is written to the wireless IC tag (4).

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。   In this case, the article moving direction in the transport device (1) is the X direction, the width direction of the belt conveyor is the Y direction, and the height direction is the Z direction, and the antenna surface of the wireless IC tag (4) is the XZ plane, Even if it is arranged in any direction of the YZ plane and the XY plane, it can communicate normally with the loop surface formed by the loop antenna (2) for the reader / writer.

しかも、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いるので、同じ面に位置している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く、不感領域のない広い範囲での読み書きをすることができる。   Moreover, since the 8-shaped antenna wire is bent to form a loop antenna in which two rectangular loop surfaces are located in parallel, the current flowing through the two antenna wires located on the same surface flows in the opposite direction. The direction in which the magnetic fields are superimposed does not weaken the magnetic field, and reading and writing can be performed in a wide range without a dead area.

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。   INDUSTRIAL APPLICABILITY 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.

図１は概略構成図である。FIG. 1 is a schematic configuration diagram. 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はアンテナ部分の展開図である。FIG. 3 is a development view of the antenna portion.

符号の説明Explanation of symbols

２…ループアンテナ、４…無線ＩＣタグ、５…アンテナ線、６…交差部分、13…電磁結合。
2 ... loop antenna, 4 ... wireless IC tag, 5 ... antenna wire, 6 ... intersection, 13 ... electromagnetic coupling.

Claims (2)

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、
８の字状アンテナ線の交差部分から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。 A loop antenna for a reader / writer that communicates with a wireless IC tag and reads information on the wireless IC tag or writes information on the wireless IC tag.
A wireless device characterized in that a portion farthest from the intersecting portion of the 8-shaped antenna line is positioned in parallel and electromagnetically coupled to form a loop, and the inside is formed in a passage space of the wireless IC tag. Loop antenna for reading and writing IC tags. ８の字状アンテナ線の交差部分を含む個所と、交差部分から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。

A rectangular loop surface is formed by bending at a location including the intersection of the figure 8 antenna line, at the middle of the farthest position from the intersection, and at one location at the farthest position from the intersection. The loop antenna for reading and writing of the wireless IC tag according to claim 1 configured.

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

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JP2004213891A JP4035524B2 (en) 2004-07-22 2004-07-22 Loop antenna for reading and writing wireless IC tags
PCT/JP2005/008855 WO2006008869A1 (en) 2004-07-22 2005-05-16 Loop antenna for wireless ic tag reading and writing

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009089163A (en) * 2007-10-01 2009-04-23 Nippon Signal Co Ltd:The Reader/writer
JPWO2016027686A1 (en) * 2014-08-21 2017-04-27 株式会社村田製作所 Method for reading article with RFID tag and RFID system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3711745B2 (en) * 1998-05-07 2005-11-02 オムロン株式会社 Data communication device
JP2000105800A (en) * 1998-09-29 2000-04-11 Toshiba Corp Radio communication medium processor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009089163A (en) * 2007-10-01 2009-04-23 Nippon Signal Co Ltd:The Reader/writer
JPWO2016027686A1 (en) * 2014-08-21 2017-04-27 株式会社村田製作所 Method for reading article with RFID tag and RFID system
US11055503B2 (en) 2014-08-21 2021-07-06 Murata Manufacturing Co., Ltd. Method for reading from RFID-tagged article and RFID system

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WO2006008869A1 (en) 2006-01-26

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