JP2004208115A - Tag information management apparatus, antenna for tag information management - Google Patents

Tag information management apparatus, antenna for tag information management Download PDF

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Publication number
JP2004208115A
JP2004208115A JP2002376065A JP2002376065A JP2004208115A JP 2004208115 A JP2004208115 A JP 2004208115A JP 2002376065 A JP2002376065 A JP 2002376065A JP 2002376065 A JP2002376065 A JP 2002376065A JP 2004208115 A JP2004208115 A JP 2004208115A
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Prior art keywords
information management
tag
loop
loop antenna
antenna
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JP2002376065A
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JP3964782B2 (en
Inventor
Keisuke Igarashi
啓介 五十嵐
Mamoru Higuchi
衛 樋口
Yoshinori Tanaka
田中　　義則
Yuji Saiyama
裕治 雜山
Osamu Furuya
修 古屋
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Hitachi Kokusai Electric Inc
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Hitachi Kokusai Electric Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a highly reliable tag information management apparatus and antenna for tag information management capable of reading or writing information on a radio tag regardless of the orientation of the radio tag surface. <P>SOLUTION: In the tag information management apparatus, having a loop antenna provided along a transport line 2, for reading or writing the information on the tag attached to an article transported by the transport line using a magnetic field generated by the loop antenna, the loop antenna comprises at least two loop antennas 1B, 1C, and each loop plane is nearly parallel to the transportation plane and magnetic fields generated by respective loop antennas 1B, 1C have directional components different from each other by about 90 degrees. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、搬送ラインに沿って設けられるループアンテナを有し、前記ループアンテナにより発生される磁界を用いて、前記搬送ラインにより搬送される物品に付されたタグの情報を読み取り、又はタグに情報を書き込むタグ情報管理装置及びタグ情報管理用アンテナに関するものである。
【０００２】
【従来の技術】
従来より、搬送ラインにより搬送される物品に無線タグを取り付け、ループアンテナにより、無線タグの情報を読み取り、或いは書き込むようにしたタグ情報管理装置が知られる。このループアンテナ１は図４に示すように、搬送ライン２に対してループ面が直交するように設けられて、このループアンテナ１を潜るように搬送される物品４に付された無線タグ４の情報を読み取り、或いは無線タグ４に情報を書き込む（交信を行う）。このようなループアンテナ１によれば、搬送ラインの搬送方向に向く磁界が発生され、このループ面に対し、無線タグ４の面（即ちタグに設けられるタグ用ループアンテナのループ面）が平行となるように（４ａの状態で）物品が搬送される場合は、高い信頼性で無線タグと交信を行うことができる。
【０００３】
しかしながら、物品に付された無線タグ４の面がタグ情報管理装置のループアンテナの中央付近でループ面と直交するように物品が搬送されてきた場合（４ｂの状態）は、図５のようにループアンテナの発生する磁界方向が無線タグ４ｂの面と同一方向となり、タグ用ループアンテナがループアンテナから発生される磁界と鎖交し難くなり、特に無線タグ４ｂが搬送ラインの中央に位置するような場合は、読み取り又は書き込み不能となる場合がある。また、物品に付された無線タグの面が搬送ラインの面と平行となる場合（４ｃの状態）も上記と同様に読み取り又は書き込み不能となる場合がある。
【０００４】
このように、上述したタグ情報管理装置では、アンテナの中央付近で無線タグ面がループアンテナのループ面と垂直となる場合、読み取り又は書き込み不能となるという問題点がある。なお、この問題点を解決するために、本発明とは構造の全く異なる下記特許文献が知られる。
【０００５】
【特許文献１】
特開２００２−２７９３６２号公報（第２−３頁、図１）
【０００６】
【発明が解決しようとする課題】
本発明は、上述した問題点を解決するため、無線タグの面がいずれの方向に向いていても、無線タグの情報の読み取り、又は書き込みが可能となり、もって信頼性の高いタグ情報管理装置及びタグ情報管理用アンテナを提供することを目的とする。
【０００７】
【課題を解決するための手段】
上述した課題を解決するため、本発明は、搬送ラインに沿って設けられるループアンテナを有し、前記ループアンテナにより発生される磁界を用いて、前記搬送ラインにより搬送される物品に付されたタグの情報を読み取り、又はタグに情報を書き込むタグ情報管理装置において、前記ループアンテナは少なくとも２つのループアンテナより構成され、各々のループ面が搬送面と概ね平行となり、各々のループアンテナの発生磁界が互いに概ね９０度異なる方向成分を有することを特徴とするものである。
【０００８】
また、本発明は、搬送ラインに沿って設けられるループアンテナを有し、前記ループアンテナにより発生される磁界を用いて、前記搬送ラインにより搬送される物品に付されたタグの情報を読み取り、又はタグに情報を書き込むタグ情報管理装置において、前記ループアンテナは少なくとも２つのループアンテナより構成され、そのうちの少なくとも１つは、ループ面が搬送面と平行となる八の字型の水平ループアンテナを設けたことを特徴とするものである。
【０００９】
また、本発明のタグ情報管理装置において、前記少なくとも２つのループアンテナとは別に、搬送ラインにより搬送される物品がくぐりぬけるようにループアンテナが設けられ、各々のループアンテナは所定距離離れて設けられることを特徴とする。
【００１０】
また、本発明のタグ情報管理装置において、前記少なくとも２つのループアンテナは搬送ラインを挟んで高さ方向二箇所に設けられることを特徴とする。
【００１１】
また、本発明は、搬送ラインによって搬送される物品に付されたタグと磁界を用いて交信を行うタグ情報管理装置に用いられるタグ情報管理用アンテナであって、搬送ラインにより搬送される物品がくぐりぬけるように設けられるループアンテナと、前記ループアンテナの前記搬送ラインの搬送方向前後それぞれに設けられ、ループ面が搬送面と平行となり、発生磁界が互いに概ね９０度異なる方向成分を有する水平ループアンテナとを備えてなるものである。
【００１２】
また、本発明のタグ情報管理用アンテナにおいて、前記水平ループアンテナは、ループ面が搬送面と概ね平行となる八の字型をなしていることを特徴とする。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を図面を用いて説明する。
実施の形態１．
図１は本発明の実施の形態におけるタグ情報管理装置の全体構成を示す図、図２は動作を示す図である。
実施の形態のタグ情報管理装置は、タグ情報管理用アンテナ１と、タグ情報管理用アンテナ１に接続され、電力を分配して供給する第１、第２分配合成器Ｈ１，Ｈ２と、無線タグの情報を読み取り、或いは無線タグに情報を書き込むリードライト装置５と、リードライト装置５と接続され、リードライト装置５を制御、管理するＰＣ６とを備えて構成される。
【００１４】
タグ情報管理用アンテナ１は、搬送ライン２を囲むように設けられ、そのループ面が搬送方向に向くループアンテナ（トンネル型ループアンテナ）１Ａと、このループアンテナ１Ａを中心に搬送ラインの搬送方向前後それぞれにおいて、搬送ラインの搬送面下方に設けられ、ループ面が搬送面と平行となり、互いに９０度異なる方向成分を有する磁界を発生する二つの八の字形のループアンテナ（水平ループアンテナ）１Ｂ，１Ｃとを備える。なお、搬送ラインを囲むように設けられるループアンテナについては、その下部は、搬送ラインを構成するベルトコンベアの上側と下側のベルト間を通されるか、又はベルトコンベア全体の下側を通されるかのいずれでも良い。これによりベルト上を搬送される物品（荷物等）はループアンテナをくぐり抜けるように搬送される。
【００１５】
即ち、一方の水平ループアンテナ１Ｂは、八の字を形成する二つのループが搬送ラインの方向と同じ方向に並ぶ形状を有し、図２（ａ）のように、搬送ラインの中央付近では、搬送ラインと同方向の成分を有する磁界を発生する。この水平ループアンテナ１Ｂによればアンテナ中央付近で、無線タグの面が搬送面に垂直で搬送方向に平行となる場合を除いて無線タグと交信することができる。他方の水平ループアンテナ１Ｃは、八の字を形成する二つのループが搬送ラインの方向と直交する方向に並ぶ形状を有し、図２（ｂ）のように、搬送ラインの方向と直交する方向の成分を有する磁界を発生する。従って、この水平ループアンテナによれば、無線タグの面がアンテナの中心で搬送方向と直交する場合を除いて無線タグと交信することができる。
【００１６】
また、トンネル型ループアンテナ１Ａによれば、図２（ｃ）に示すように、無線タグの面が搬送方向に平行となる場合及び無線タグの面がアンテナ中央付近で、搬送面と平行（水平）となる場合を除いて無線タグと交信することができる。このトンネル型ループアンテナで交信できる無線タグの面方向は、二つの水平ループアンテナのいずれかによってもカバーされ得るが、トンネル型ループアンテナは高さ方向における交信範囲を広範囲にカバーすることができる。
【００１７】
また、トンネル型ループアンテナと水平ループアンテナとは搬送方向に所定距離離れて設けられている。この所定距離は、互いのループアンテナが干渉せず、各ループアンテナによる磁界の確保がなされて、確実に無線タグとの交信を行うことができ、漏れのない物品管理を行うことができる距離に設定される。
【００１８】
実施の形態２．
図３は、水平ループアンテナによる高さ方向の交信範囲を広げるため、搬送ラインの上方においても、水平ループアンテナ１Ｂ´、１Ｃ´を設けるようにしたものである。これら水平ループアンテナは、搬送ラインの下方に設けられた水平ループアンテナとそれぞれと同じ形状を有して、平行に設けられる。またそれらの高さ位置は、トンネル型ループアンテナの上辺と略同じ位置とされている。
実施の形態２によれば、水平ループアンテナによる高さ方向の交信範囲を広げることができ、交信の信頼性をより高めることができる。
【００１９】
【発明の効果】
上述したように、本発明によれば、無線タグの面がいずれの方向に向いていても、無線タグの情報の読み取り、又は書き込みが可能となり、もって信頼性の高いタグ情報管理装置及びタグ情報管理用アンテナを提供することができるという効果を奏する。
【図面の簡単な説明】
【図１】本発明の実施の形態におけるタグ情報管理装置の全体構成を示す図である。
【図２】実施の形態の動作を説明する図である。
【図３】本発明の実施の形態２にかかるタグ情報管理用アンテナを示す斜視図である。
【図４】従来のタグ情報管理装置の全体構成を示す図である。
【図５】従来の問題点を説明するための図である。
【符号の説明】
１ タグ情報管理用アンテナ、１Ａ ループアンテナ（トンネル型ループアンテナ）、１Ｂ，１Ｃ，１Ｂ´，１Ｃ´ 水平型ループアンテナ、５ リードライト装置、６ ＰＣ、Ｈ１，Ｈ２ 分配合成器。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention has a loop antenna provided along a transport line, using a magnetic field generated by the loop antenna, to read the information of the tag attached to the article transported by the transport line, or to the tag The present invention relates to a tag information management device for writing information and a tag information management antenna.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a tag information management device in which a wireless tag is attached to an article conveyed by a conveying line, and information of the wireless tag is read or written by a loop antenna. As shown in FIG. 4, the loop antenna 1 is provided so that the loop surface is orthogonal to the transport line 2, and is provided with a wireless tag 4 attached to an article 4 transported under the loop antenna 1. Read information or write information to wireless tag 4 (communicate). According to such a loop antenna 1, a magnetic field is generated which is directed in the transport direction of the transport line, and the surface of the wireless tag 4 (ie, the loop surface of the tag loop antenna provided on the tag) is parallel to this loop surface. When the article is conveyed as described above (in the state of 4a), communication with the wireless tag can be performed with high reliability.
[0003]
However, when the article is conveyed such that the surface of the wireless tag 4 attached to the article is orthogonal to the loop surface near the center of the loop antenna of the tag information management device (state 4b), as shown in FIG. The direction of the magnetic field generated by the loop antenna is in the same direction as the surface of the wireless tag 4b, so that the tag loop antenna is unlikely to interlink with the magnetic field generated by the loop antenna. In particular, the wireless tag 4b is positioned at the center of the transport line. In such a case, reading or writing may not be possible. Also, when the surface of the wireless tag attached to the article is parallel to the surface of the transport line (state 4c), reading or writing may not be possible in the same manner as described above.
[0004]
As described above, in the above-described tag information management device, there is a problem that reading or writing becomes impossible when the wireless tag surface is perpendicular to the loop surface of the loop antenna near the center of the antenna. In order to solve this problem, the following patent documents having a completely different structure from the present invention are known.
[0005]
[Patent Document 1]
JP-A-2002-279362 (page 2-3, FIG. 1)
[0006]
[Problems to be solved by the invention]
The present invention solves the above-described problems, and enables reading or writing of information of a wireless tag, regardless of the direction of the surface of the wireless tag, so that a highly reliable tag information management device and An object of the present invention is to provide a tag information management antenna.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention has a loop antenna provided along a transport line, and a tag attached to an article transported by the transport line using a magnetic field generated by the loop antenna. In the tag information management device for reading information or writing information to a tag, the loop antenna is composed of at least two loop antennas, each loop surface is substantially parallel to the transport surface, and the generated magnetic field of each loop antenna is It is characterized by having directional components which are different from each other by approximately 90 degrees.
[0008]
Further, the present invention has a loop antenna provided along a transport line, using a magnetic field generated by the loop antenna, read information of a tag attached to an article transported by the transport line, or In the tag information management device for writing information to a tag, the loop antenna is composed of at least two loop antennas, at least one of which is provided with an eight-shaped horizontal loop antenna whose loop surface is parallel to the transport surface. It is characterized by having.
[0009]
Further, in the tag information management device of the present invention, apart from the at least two loop antennas, a loop antenna is provided so that an article conveyed by the conveyance line can pass through, and each loop antenna is provided at a predetermined distance. It is characterized by the following.
[0010]
Further, in the tag information management device of the present invention, the at least two loop antennas are provided at two positions in a height direction with a transport line interposed therebetween.
[0011]
Further, the present invention is a tag information management antenna used for a tag information management device that performs communication using a magnetic field with a tag attached to an article conveyed by a conveyance line, wherein the article conveyed by the conveyance line is A loop antenna that is provided so as to be able to pass through, and a horizontal loop antenna that is provided before and after each of the loop antenna in the transport direction of the transport line, the loop surface is parallel to the transport surface, and the generated magnetic fields have direction components that are different from each other by approximately 90 degrees. It is provided with.
[0012]
Further, in the tag information management antenna according to the present invention, the horizontal loop antenna is characterized in that the loop surface has an eight-shaped shape that is substantially parallel to the transport surface.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram showing an overall configuration of a tag information management device according to an embodiment of the present invention, and FIG. 2 is a diagram showing operation.
The tag information management device according to the embodiment includes a tag information management antenna 1, first and second distribution / synthesizers H1 and H2 connected to the tag information management antenna 1 for distributing and supplying power, and a wireless tag. And a PC 6 which is connected to the read / write device 5 and controls and manages the read / write device 5.
[0014]
The tag information management antenna 1 is provided so as to surround the transport line 2 and has a loop antenna (tunnel-type loop antenna) 1A whose loop surface faces in the transport direction, and the transport direction of the transport line around the loop antenna 1A in the transport direction. In each case, two figure-shaped loop antennas (horizontal loop antennas) 1B and 1C are provided below the transport surface of the transport line, the loop surface is parallel to the transport surface, and generate magnetic fields having directional components different from each other by 90 degrees. And In addition, about the loop antenna provided so as to surround the transport line, the lower part is passed between the upper and lower belts of the belt conveyor constituting the transport line, or is passed through the lower side of the entire belt conveyor. Or any of them. As a result, articles (baggage, etc.) conveyed on the belt are conveyed so as to pass through the loop antenna.
[0015]
That is, one horizontal loop antenna 1B has a shape in which two loops forming an eight-shape are arranged in the same direction as the direction of the transport line. As shown in FIG. 2A, near the center of the transport line, A magnetic field having a component in the same direction as the transport line is generated. According to the horizontal loop antenna 1B, it is possible to communicate with the wireless tag near the center of the antenna except when the surface of the wireless tag is perpendicular to the transport surface and parallel to the transport direction. The other horizontal loop antenna 1C has a shape in which two loops forming an eight-shape are arranged in a direction orthogonal to the direction of the transport line, and a direction orthogonal to the direction of the transport line as shown in FIG. A magnetic field having the following components is generated. Therefore, according to the horizontal loop antenna, it is possible to communicate with the wireless tag except when the surface of the wireless tag is orthogonal to the transport direction at the center of the antenna.
[0016]
Further, according to the tunnel type loop antenna 1A, as shown in FIG. 2C, when the surface of the wireless tag is parallel to the transport direction and when the surface of the wireless tag is near the center of the antenna, it is parallel to the transport surface (horizontal). Except in the case of), communication with the wireless tag is possible. The plane direction of the wireless tag that can be communicated with this tunnel type loop antenna can be covered by either of the two horizontal loop antennas, but the tunnel type loop antenna can cover a wide range of communication in the height direction.
[0017]
The tunnel type loop antenna and the horizontal loop antenna are provided at a predetermined distance in the transport direction. This predetermined distance is a distance at which the loop antennas do not interfere with each other, the magnetic field is secured by each loop antenna, communication with the wireless tag can be performed reliably, and article management without leakage can be performed. Is set.
[0018]
Embodiment 2 FIG.
FIG. 3 shows a configuration in which horizontal loop antennas 1B 'and 1C' are provided above the transport line in order to extend the range of communication in the height direction by the horizontal loop antenna. These horizontal loop antennas have the same shape as the horizontal loop antennas provided below the transport line and are provided in parallel. Further, their height positions are set to be substantially the same as the upper side of the tunnel type loop antenna.
According to the second embodiment, the communication range in the height direction by the horizontal loop antenna can be expanded, and the reliability of communication can be further improved.
[0019]
【The invention's effect】
As described above, according to the present invention, it is possible to read or write information of a wireless tag regardless of the direction of the surface of the wireless tag, and thus a highly reliable tag information management device and tag information There is an effect that a management antenna can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a tag information management device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating the operation of the embodiment.
FIG. 3 is a perspective view showing a tag information management antenna according to a second embodiment of the present invention;
FIG. 4 is a diagram showing an overall configuration of a conventional tag information management device.
FIG. 5 is a diagram for explaining a conventional problem.
[Explanation of symbols]
1 tag information management antenna, 1A loop antenna (tunnel loop antenna), 1B, 1C, 1B ', 1C' horizontal loop antenna, 5 read / write device, 6 PC, H1, H2 distribution combiner.

Claims (6)

搬送ラインに沿って設けられるループアンテナを有し、前記ループアンテナにより発生される磁界を用いて、前記搬送ラインにより搬送される物品に付されたタグの情報を読み取り、又はタグに情報を書き込むタグ情報管理装置において、
前記ループアンテナは少なくとも２つのループアンテナより構成され、各々のループ面が搬送面と概ね平行となり、各々のループアンテナの発生磁界が互いに概ね９０度異なる方向成分を有することを特徴とするタグ情報管理装置。A tag having a loop antenna provided along a transport line, using a magnetic field generated by the loop antenna, reading information on a tag attached to an article transported by the transport line, or writing information to the tag In the information management device,
The tag information management, wherein the loop antenna is composed of at least two loop antennas, each loop surface being substantially parallel to the transport surface, and the magnetic field generated by each loop antenna having a direction component that is different from each other by approximately 90 degrees. apparatus. 搬送ラインに沿って設けられるループアンテナを有し、前記ループアンテナにより発生される磁界を用いて、前記搬送ラインにより搬送される物品に付されたタグの情報を読み取り、又はタグに情報を書き込むタグ情報管理装置において、
前記ループアンテナは少なくとも２つのループアンテナより構成され、そのうちの少なくとも１つは、ループ面が搬送面と平行となる八の字型の水平ループアンテナを設けたことを特徴とするタグ情報管理装置。A tag having a loop antenna provided along a transport line, using a magnetic field generated by the loop antenna, reading information on a tag attached to an article transported by the transport line, or writing information to the tag In the information management device,
The tag information management device, wherein the loop antenna comprises at least two loop antennas, at least one of which is provided with an eight-shaped horizontal loop antenna having a loop surface parallel to a transport surface. 請求項１又は請求項２に記載のタグ情報管理装置において、前記少なくとも２つのループアンテナとは別に、搬送ラインにより搬送される物品がくぐりぬけるようにループアンテナが設けられ、各々のループアンテナは所定距離離れて設けられることを特徴とするタグ情報管理装置。3. The tag information management device according to claim 1, wherein a loop antenna is provided separately from the at least two loop antennas so that an article conveyed by a conveyance line can pass therethrough. A tag information management device, which is provided at a distance. 請求項１乃至請求項３のいずれかに記載のタグ情報管理装置において、
前記少なくとも２つのループアンテナは搬送ラインを挟んで高さ方向二箇所に設けられることを特徴とするタグ情報管理装置。The tag information management device according to any one of claims 1 to 3,
The tag information management device, wherein the at least two loop antennas are provided at two positions in a height direction with a transport line interposed therebetween. 搬送ラインによって搬送される物品に付されたタグと磁界を用いて交信を行うタグ情報管理装置に用いられるタグ情報管理用アンテナであって、
搬送ラインにより搬送される物品がくぐりぬけるように設けられるループアンテナと、
前記ループアンテナの前記搬送ラインの搬送方向前後それぞれに設けられ、ループ面が搬送面と平行となり、発生磁界が互いに概ね９０度異なる方向成分を有する水平ループアンテナと
を備えてなるタグ情報管理用アンテナ。A tag information management antenna used for a tag information management device that performs communication using a magnetic field and a tag attached to an article conveyed by a conveyance line,
A loop antenna provided so that articles conveyed by the conveyance line can pass through;
A tag information management antenna comprising: a horizontal loop antenna provided before and after each of the loop antenna in the transport direction of the transport line, the loop surface being parallel to the transport surface, and the generated magnetic fields having directional components substantially different from each other by 90 degrees. . 請求項５に記載のタグ情報管理用アンテナにおいて、
前記水平ループアンテナは、ループ面が搬送面と概ね平行となる八の字型をなしていることを特徴とするタグ情報管理用アンテナ。The tag information management antenna according to claim 5,
The horizontal loop antenna is an antenna for managing tag information, wherein the loop surface has an eight-shaped shape that is substantially parallel to a transport surface.
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