JP2005005876A - Radio data carrier recognition device - Google Patents

Radio data carrier recognition device Download PDF

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Publication number
JP2005005876A
JP2005005876A JP2003165332A JP2003165332A JP2005005876A JP 2005005876 A JP2005005876 A JP 2005005876A JP 2003165332 A JP2003165332 A JP 2003165332A JP 2003165332 A JP2003165332 A JP 2003165332A JP 2005005876 A JP2005005876 A JP 2005005876A
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Japan
Prior art keywords
radio wave
antenna
data carrier
wireless
area
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JP2003165332A
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JP3854248B2 (en
Inventor
Hidekazu Mori
英一 森
Shinya Nakanishi
真也 中西
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Toshiba TEC Corp
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Toshiba TEC Corp
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • G06K7/10178—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field

Abstract

<P>PROBLEM TO BE SOLVED: To extend a recognition area of a radio data carrier without moving an irradiation direction of an antenna. <P>SOLUTION: A radio data carrier recognition device is provided with the antenna 3 for irradiating the prescribed recognition area 5 in which the radio data carrier is considered to position with an inquiry radio wave and a reflecting plate 4 arranged in a position confronted with an antenna face of the antenna 3. The reflecting plate 4 has a convex reflecting face which reflects the inquiry radio wave irradiated from the antenna 3 and extends an irradiation area of the inquiry radio wave much more than the recognition area. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、無線を利用して例えば書留郵便物に付される無線データキャリアを認識する無線データキャリア認識装置に関する。
【０００２】
【従来の技術】
近年、固有の無線ＩＤが設定されるとともに情報の書換可能なメモリエリアを有し、無線を利用して非接触で無線ＩＤの読出しや任意の情報の書込み及び読出しができる無線データキャリアが注目されている。
【０００３】
この無線データキャリアの一例として、無線タグがある。無線タグは、送受信アンテナとＩＣチップとからなる小型軽量のもので、物品の表面に貼付されたり物品に埋め込まれたりして、物品に設けられる。ＩＣチップには、不揮発性のメモリと、前記アンテナで受信した信号に応答して前記メモリ内の情報を変調し前記アンテナを介して電波として発信させる制御回路とが設けられている。
【０００４】
無線タグを認識する装置として無線タグ認識装置が開発されている。この装置は送受信アンテナを備えており、この送受信アンテナの交信エリア（感度範囲）内に置かれた全ての無線タグから情報を一括して認識するものである。換言すれば、送受信アンテナの交信エリアから外れた無線タグの情報は認識することができない。そこで従来、アンテナの指向性を利用して無線電波の照射方向を左右に変化させることにより送受信アンテナの交信エリアを拡張させて、無線タグの認識漏れを防止するようにした技術があった（例えば、特許文献１参照）。
【０００５】
【特許文献１】
特開２００２−１７１２２９
【０００６】
【発明が解決しようとする課題】
しかしながら従来は、アンテナの指向性を利用して無線電波の照射方向を左右に変化させるので、アンテナの向きを左右に動かすための複雑な機構が必要であった。またアンテナは、一般に、通信ケーブルによって無線タグリーダ等の装置に接続されているため、アンテナを動かす機構を設ける際にケーブルが邪魔になったり、アンテナの移動によってケーブルが傷んだりする懸念があった。
【０００７】
本発明はこのような事情に基づいてなされたもので、その目的とするところは、アンテナの照射向きを移動させることなく、無線データキャリアの認識エリアを拡張できる無線データキャリア認識装置を提供しようとするものである。
【０００８】
【課題を解決するための手段】
本発明は、無線による問合せ電波を受信するとそれに応答して無線電波を発信する無線データキャリアからの無線電波により無線データキャリアを認識する無線データキャリア認識装置において、無線データキャリアが位置する所定の認識エリアに問合せ電波を照射する電波発信手段、例えばアンテナと、この電波発信手段から照射される問合せ電波を反射させて問合せ電波の照射エリアを認識エリアよりも拡張させる電波反射手段、例えば凸状の反射面を有する反射板とを備えたものである。
【０００９】
【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。
なお、この実施の形態は、記録扱い郵便物である複数の書留郵便物にそれぞれ貼付される無線タグの情報を認識する無線タグ認識装置に本発明を適用した場合である。無線タグは、無線データキャリアの一例であり、無線タグ認識装置は、無線データキャリア認識装置の一例である。
【００１０】
図１は第１の実施の形態の概略構成図であり、第１の実施の形態において、無線タグ認識装置は、無線タグリーダ１と、この無線タグリーダ１に通信ケーブル２を介して接続されたアンテナ３と、このアンテナ３のアンテナ面と対向する位置に配置された反射板４とから構成されている。反射板４は、凸状の反射面を有する。そして、アンテナ３のアンテナ面と反射板４の反射面とによって挟まれる空間の領域を無線タグ８の認識エリア５とし、この認識エリア５に、認識対象物である書留郵便物６を収容した郵袋ケース７を置いて、このケース７内の全ての書留郵便物６にそれぞれ付された無線タグ８を、無線タグリーダ１によって認識するというものである。
【００１１】
図２は無線タグリーダ１の要部構成を示すブロック図である。無線タグリーダ１は、例えばパソコン等の上位装置とのインタフェース部１１と、ＣＰＵ，ＲＯＭ，ＲＡＭ等で構成される制御部１２と、制御部１２から与えられるデータを無線通信に適した変調信号に変調する変調部１３と、変調信号を増幅してアンテナ３から問合せ電波として放射させる送信アンプ１４と、アンテナ３で受信した電波信号を増幅する受信アンプ１５と、増幅された電波信号からデータを復調して制御部１２に与える復調部１６とから構成されている。
【００１２】
図３は無線タグ８の要部構成を示すブロック図であり、無線タグ８は、帯状の基板の外周に沿って形成されたコイル状のループアンテナ８１と、当該基板に形成されたＬＳＩチップ８２とからなる。ＬＳＩチップ８２は、ループアンテナ８１で受信した変調電波の整流と安定化を行なうことによりＬＳＩチップ８２の各部に電源を供給する電源生成部８３、上記変調電波を復調して制御部８６へ送出する復調部８４、制御部８６から送出されたデータを変調してループアンテナ８１に送出する変調部８５、復調部８４で復調されたデータのメモリ８７への書込みや、メモリ８７から送信データを読み出して変調部８５へ送出する制御部８６及び不揮発性のメモリ８７で構成されている。メモリ８７には、当該無線タグ８の製造段階で製造業者により割当て設定された固有の無線ＩＤ（ＲＦＩＤ）を記憶する無線ＩＤエリア８７ａと、ユーザが任意のデータを書込むことができるユーザエリア８７ｂとが形成されている。
【００１３】
このように構成された本実施の形態においては、無線タグリーダ１の上位装置から無線タグ８の認識要求があると、無線タグリーダ１が動作してアンテナ３から問合せ電波が発信される。ここに、アンテナ３は、電波発信手段として機能する。
【００１４】
アンテナ３から発信された問合せ電波は、アンテナ面と略平行、詳しくはアンテナ面から離れるに従い徐々に狭まるように照射される。これにより、図４のハッチングで埋められた領域Ｐ内にある無線タグ８が問合せ電波を受信して起動し、メモリ８７に記憶した情報をループアンテナ８１から無線電波として発信する。しかし、問合せ電波の照射領域Ｐから外れたところに位置する一部の無線タグ８ａは起動しない。無線タグ８から発信された無線電波はアンテナ３で受信され、無線タグリーダ１に与えられる。これにより、無線タグ８が無線タグリーダ１によって認識される。したがって、この時点では、照射領域Ｐが無線タグの認識エリアとなる。
【００１５】
ここで、本実施の形態では認識エリアを挟んでアンテナ３のアンテナ面と対向する位置に、凸状の反射面を有する反射板４を配置している。したがって、図５に示すように、アンテナ３から照射された問合せ電波は、反射板４の凸状の反射面で反射する。この反射波により、問合せ電波の照射領域は、領域Ｐに加え、その左右両側のハッチングＱで埋められた領域まで拡がる。これにより、領域Ｐから外れた位置にある無線タグ８ａも問合せ電波を受信して起動し、メモリ８７に記憶した情報をループアンテナ８１から無線電波として発信する。この無線電波はアンテナ３で受信され、無線タグリーダ１に与えられる。かくして、領域Ｐに加え、その左右に拡がった領域Ｑまでが無線タグの認識エリアとなる。
【００１６】
このように本実施の形態によれば、アンテナ３のアンテナ面と対向する位置に凸状の反射面を有する反射板４を配置するという簡単な構成によって、アンテナ３の照射向きを動かすことなく無線タグの認識エリアを拡張することができる。この結果、一度により多くの書留郵便物６に付された無線タグ８を認識できるようになるので、認識作業の効率化を図ることができる。
【００１７】
なお、本発明は前記実施の形態のものに限定されるものではない。
図６は本発明の第２の実施の形態の概略構成図であり、図１と同一部分には同一符号を付している。すなわち、この第２の実施の形態の無線タグ認識装置は、アンテナ３のアンテナ面と対向する位置に認識エリア５を挟んで配置される反射板を、凸状の反射面を有する反射板４から、平らな反射面を有する反射板４１に置換するとともに、アンテナ３のアンテナ面中心と反射板４１の反射面中心とを結ぶ軸に対して反射面が左右に回転振動するように反射板４１を動かす駆動機構４２を設けたものである。
【００１８】
このような構成により、アンテナ３から照射された問合せ電波は、反射板４１の反射面によって反射される。このとき、反射板の反射面が、図７の図示において左向き（反時計回り）に回転駆動しているときには、問合せ電波の照射領域はハッチングＱ１で埋められた領域まで拡がる。また、右向き（時計回り）に回転駆動しているときには、問合せ電波の照射領域はハッチングＱ２で埋められた領域まで拡がる。
【００１９】
かくして、本実施の形態によれば、アンテナ３の照射向きを動かすことなく無線タグの認識エリアを時分割に拡張することができるという効果を奏することができる。
【００２０】
なお、前記実施の形態では、反射板４１を左右に回転振動するようにしたが、上下に回転振動するように構成することによって、無線タグ認識エリアの拡張を図ってもよい。また、反射板４１を上下左右に回転振動するように構成することによって、無線タグ認識エリアをさらに拡張することも可能である。
【００２１】
因みに、このような反射板４１の駆動機構４２としては、レーザ光を希望する範囲に変更する既知の技術であるガルバノミラー（例えば特公平６−７０６８９号公報に記載）の制御技術を用いることができる。すなわち、ガルバノミラーのミラーに相当する部分に反射板４１を設けることによって、反射板４１の反射面が希望する方向を向くように反射板４１を駆動し、無線タグ認識エリアを拡張することができる。
【００２２】
この他、本発明を書留郵便物に付された無線タグ以外の無線データキャリア認識技術に適用する等、本発明の要旨を逸脱しない範囲で種々変形実施可能であるのは勿論である。
【００２３】
【発明の効果】
以上詳述したように本発明によれば、アンテナの照射向きを移動させることなく、無線データキャリアの認識エリアを拡張できる無線データキャリア認識装置を提供できる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の概略構成を示す模式図。
【図２】無線タグリーダの要部構成を示すブロック図。
【図３】無線タグの要部構成を示すブロック図。
【図４】アンテナから照射される問合せ電波だけによる無線タグ認識エリアの概念を示す模式図。
【図５】第１の実施の形態における反射板で反射した問合せ電波を含む無線タグ認識エリアの概念を示す模式図。
【図６】本発明の第２の実施の形態の概略構成を示す模式図。
【図７】第２の実施の形態における反射板で反射した問合せ電波を含む無線タグ認識エリアの概念を示す模式図。
【符号の説明】
１…無線タグリーダ、３…アンテナ、４，４１…反射板、８…無線タグ、４２…駆動機構。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless data carrier recognition apparatus that recognizes a wireless data carrier attached to, for example, a registered mail using wireless.
[0002]
[Prior art]
In recent years, wireless data carriers that have a unique wireless ID and have a memory area in which information can be rewritten, and can read and write wireless IDs and read and write arbitrary information wirelessly are drawing attention. ing.
[0003]
An example of this wireless data carrier is a wireless tag. The wireless tag is a small and lightweight tag including a transmission / reception antenna and an IC chip, and is attached to the surface of the article or embedded in the article to be provided on the article. The IC chip is provided with a non-volatile memory and a control circuit that modulates information in the memory in response to a signal received by the antenna and transmits the information as a radio wave through the antenna.
[0004]
A wireless tag recognition device has been developed as a device for recognizing a wireless tag. This apparatus includes a transmission / reception antenna, and recognizes information from all wireless tags placed in a communication area (sensitivity range) of the transmission / reception antenna. In other words, information of the wireless tag that is out of the communication area of the transmission / reception antenna cannot be recognized. Therefore, conventionally, there has been a technology for expanding the communication area of the transmission / reception antenna by changing the irradiation direction of the radio wave to the left and right using the directivity of the antenna to prevent the recognition failure of the wireless tag (for example, , See Patent Document 1).
[0005]
[Patent Document 1]
JP2002-171229
[0006]
[Problems to be solved by the invention]
However, conventionally, since the direction of radio wave irradiation is changed to the left and right using the directivity of the antenna, a complicated mechanism for moving the direction of the antenna to the left and right has been required. Further, since the antenna is generally connected to a device such as a wireless tag reader by a communication cable, there is a concern that the cable may become an obstacle when a mechanism for moving the antenna is provided, or the cable may be damaged by the movement of the antenna.
[0007]
The present invention has been made based on such circumstances, and an object of the present invention is to provide a wireless data carrier recognition device capable of extending a wireless data carrier recognition area without moving the antenna irradiation direction. To do.
[0008]
[Means for Solving the Problems]
The present invention relates to a wireless data carrier recognition device that recognizes a wireless data carrier by wireless radio waves from a wireless data carrier that transmits wireless radio waves in response to reception of wireless inquiry radio waves. Radio wave transmitting means for irradiating an inquiry radio wave to the area, for example, an antenna, and radio wave reflecting means for reflecting the inquiry radio wave radiated from the radio wave transmitting means to expand the irradiation area of the inquiry radio wave beyond the recognition area, for example, convex reflection And a reflector having a surface.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
This embodiment is a case where the present invention is applied to a wireless tag recognition device that recognizes information of a wireless tag attached to each of a plurality of registered mails that are recorded mails. The wireless tag is an example of a wireless data carrier, and the wireless tag recognition device is an example of a wireless data carrier recognition device.
[0010]
FIG. 1 is a schematic configuration diagram of a first embodiment. In the first embodiment, a wireless tag recognition device includes a wireless tag reader 1 and an antenna connected to the wireless tag reader 1 via a communication cable 2. 3 and a reflection plate 4 disposed at a position facing the antenna surface of the antenna 3. The reflecting plate 4 has a convex reflecting surface. A region of the space sandwiched between the antenna surface of the antenna 3 and the reflection surface of the reflector 4 is used as a recognition area 5 of the wireless tag 8, and a mail bag containing a registered mail piece 6 as a recognition target object in the recognition area 5. A case 7 is placed, and the wireless tag reader 1 recognizes the wireless tags 8 attached to all the registered mail items 6 in the case 7.
[0011]
FIG. 2 is a block diagram showing a main configuration of the wireless tag reader 1. The wireless tag reader 1 modulates an interface unit 11 with a host device such as a personal computer, a control unit 12 composed of a CPU, a ROM, a RAM, etc. A modulating unit 13 that amplifies the modulated signal and radiates it as an inquiry radio wave from the antenna 3, a receiving amplifier 15 that amplifies the radio signal received by the antenna 3, and a data demodulated from the amplified radio signal. The demodulator 16 is provided to the controller 12.
[0012]
FIG. 3 is a block diagram showing the configuration of the main part of the wireless tag 8. The wireless tag 8 includes a coiled loop antenna 81 formed along the outer periphery of the belt-like substrate and an LSI chip 82 formed on the substrate. It consists of. The LSI chip 82 rectifies and stabilizes the modulated radio wave received by the loop antenna 81, demodulates the modulated radio wave, and sends it to the control unit 86. Modulation unit 85 that modulates data sent from demodulation unit 84 and control unit 86 and sends the data to loop antenna 81, writes data demodulated by demodulation unit 84 to memory 87, and reads transmission data from memory 87 The control unit 86 and the non-volatile memory 87 for sending to the modulation unit 85 are configured. In the memory 87, a wireless ID area 87a for storing a unique wireless ID (RFID) assigned and set by the manufacturer at the manufacturing stage of the wireless tag 8, and a user area 87b in which a user can write arbitrary data. And are formed.
[0013]
In the present embodiment configured as described above, when there is a request for recognition of the wireless tag 8 from the host device of the wireless tag reader 1, the wireless tag reader 1 operates and an inquiry radio wave is transmitted from the antenna 3. Here, the antenna 3 functions as radio wave transmission means.
[0014]
The inquiry radio wave transmitted from the antenna 3 is irradiated so as to be substantially parallel to the antenna surface, more specifically, gradually narrowing away from the antenna surface. Thereby, the wireless tag 8 in the area P filled with hatching in FIG. 4 receives the inquiry radio wave and starts up, and transmits the information stored in the memory 87 as a radio radio wave from the loop antenna 81. However, some of the wireless tags 8a located outside the irradiation region P of the inquiry radio wave are not activated. Radio waves transmitted from the radio tag 8 are received by the antenna 3 and given to the radio tag reader 1. As a result, the wireless tag 8 is recognized by the wireless tag reader 1. Therefore, at this time, the irradiation area P is a wireless tag recognition area.
[0015]
Here, in the present embodiment, the reflecting plate 4 having a convex reflecting surface is disposed at a position facing the antenna surface of the antenna 3 across the recognition area. Therefore, as shown in FIG. 5, the inquiry radio wave emitted from the antenna 3 is reflected by the convex reflecting surface of the reflector 4. By this reflected wave, the irradiation area of the inquiry radio wave expands to the area filled with the hatching Q on both the left and right sides in addition to the area P. As a result, the wireless tag 8a located outside the region P is also activated by receiving the inquiry radio wave, and transmits the information stored in the memory 87 as a radio wave from the loop antenna 81. This radio wave is received by the antenna 3 and given to the radio tag reader 1. Thus, in addition to the region P, the region Q extending to the left and right is the wireless tag recognition area.
[0016]
As described above, according to the present embodiment, a simple configuration in which the reflecting plate 4 having a convex reflecting surface is disposed at a position facing the antenna surface of the antenna 3, and wirelessly without moving the irradiation direction of the antenna 3. The tag recognition area can be expanded. As a result, since the wireless tags 8 attached to more registered mail items 6 can be recognized at once, the efficiency of the recognition work can be improved.
[0017]
The present invention is not limited to the embodiment described above.
FIG. 6 is a schematic configuration diagram of the second embodiment of the present invention, and the same parts as those in FIG. That is, in the wireless tag recognition device according to the second embodiment, the reflection plate disposed with the recognition area 5 sandwiched between the antenna 3 and the antenna surface is separated from the reflection plate 4 having a convex reflection surface. The reflection plate 41 is replaced with a reflection plate 41 having a flat reflection surface, and the reflection plate 41 is rotated left and right with respect to an axis connecting the antenna surface center of the antenna 3 and the reflection surface center of the reflection plate 41. The drive mechanism 42 to move is provided.
[0018]
With such a configuration, the inquiry radio wave emitted from the antenna 3 is reflected by the reflection surface of the reflection plate 41. At this time, when the reflecting surface of the reflecting plate is driven to rotate leftward (counterclockwise) in the illustration of FIG. 7, the irradiation area of the inquiry radio wave expands to the area filled with hatching Q1. In addition, when rotating in the right direction (clockwise), the irradiation area of the inquiry radio wave extends to the area filled with hatching Q2.
[0019]
Thus, according to the present embodiment, the wireless tag recognition area can be expanded in a time-division manner without moving the irradiation direction of the antenna 3.
[0020]
In the above-described embodiment, the reflector 41 is rotated and oscillated left and right. However, the wireless tag recognition area may be expanded by configuring the reflector 41 to oscillate vertically. Further, the wireless tag recognition area can be further expanded by configuring the reflector 41 so as to rotate and vibrate in the vertical and horizontal directions.
[0021]
Incidentally, as such a drive mechanism 42 for the reflector 41, a control technique of a galvanometer mirror (for example, described in Japanese Patent Publication No. 6-70689), which is a known technique for changing laser light to a desired range, is used. it can. That is, by providing the reflection plate 41 in a portion corresponding to the mirror of the galvano mirror, the reflection plate 41 can be driven so that the reflection surface of the reflection plate 41 faces a desired direction, and the wireless tag recognition area can be expanded. .
[0022]
In addition, the present invention can be variously modified without departing from the gist of the present invention, such as applying the present invention to a wireless data carrier recognition technique other than the wireless tag attached to the registered mail.
[0023]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a wireless data carrier recognition device that can expand the wireless data carrier recognition area without moving the antenna irradiation direction.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a schematic configuration of a first embodiment of the present invention.
FIG. 2 is a block diagram showing a main configuration of a wireless tag reader.
FIG. 3 is a block diagram illustrating a main configuration of a wireless tag.
FIG. 4 is a schematic diagram showing a concept of a wireless tag recognition area only by inquiry radio waves emitted from an antenna.
FIG. 5 is a schematic diagram showing a concept of a wireless tag recognition area including an inquiry radio wave reflected by a reflecting plate in the first embodiment.
FIG. 6 is a schematic diagram showing a schematic configuration of a second embodiment of the present invention.
FIG. 7 is a schematic diagram showing a concept of a wireless tag recognition area including an inquiry radio wave reflected by a reflecting plate in the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wireless tag reader, 3 ... Antenna, 4, 41 ... Reflecting plate, 8 ... Wireless tag, 42 ... Drive mechanism.

Claims (3)

無線による問合せ電波を受信するとそれに応答して無線電波を発信する無線データキャリアからの前記無線電波により前記無線データキャリアを認識する無線データキャリア認識装置において、
前記無線データキャリアが位置する所定の認識エリアに前記問合せ電波を照射する電波発信手段と、
この電波発信手段から照射される前記問合せ電波を反射させて前記問合せ電波の照射エリアを前記認識エリアよりも拡張させる電波反射手段とを具備したことを特徴とする無線データキャリア認識装置。In the wireless data carrier recognition device that recognizes the wireless data carrier by the wireless radio wave from the wireless data carrier that transmits the wireless radio wave in response to receiving the wireless inquiry radio wave,
Radio wave transmitting means for irradiating the inquiry radio wave to a predetermined recognition area where the wireless data carrier is located;
A radio data carrier recognizing apparatus comprising: radio wave reflecting means for reflecting the inquiry radio wave emitted from the radio wave transmitting means to expand an irradiation area of the inquiry radio wave more than the recognition area. 前記電波反射手段は、前記電波発信手段と前記認識エリアを挟んで対向する位置に置かれた凸状の反射面を有する反射板であることを特徴とする請求項１記載の無線データキャリア認識装置。2. The wireless data carrier recognizing device according to claim 1, wherein the radio wave reflecting means is a reflector having a convex reflecting surface placed at a position facing the radio wave transmitting means across the recognition area. . 前記電波反射手段は、前記電波発信手段と前記認識エリアを挟んで対向する位置に置かれた反射板と、この反射板の反射面で反射する前記問合せ電波が拡張する方向に前記反射板を動かす反射板駆動手段とからなることを特徴とする請求項１記載の無線データキャリア認識装置。The radio wave reflecting means moves the reflecting plate in a direction in which the interrogation radio wave reflected by the reflecting surface of the reflecting plate is extended at a position facing the radio wave transmitting means across the recognition area. 2. The wireless data carrier recognition apparatus according to claim 1, further comprising a reflector driving unit.
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