JP2006270212A - Radio tag - Google Patents

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JP2006270212A
JP2006270212A JP2005081821A JP2005081821A JP2006270212A JP 2006270212 A JP2006270212 A JP 2006270212A JP 2005081821 A JP2005081821 A JP 2005081821A JP 2005081821 A JP2005081821 A JP 2005081821A JP 2006270212 A JP2006270212 A JP 2006270212A
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antenna
embodiment
wireless tag
ic chip
article
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JP4437965B2 (en
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Akira Ikeda
昌 池田
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Nec Tokin Corp
Necトーキン株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio tag having a satisfactory communication state even if the environment of use is changed. <P>SOLUTION: An antenna 3 having a first form directly joined to the I/O terminal of an IC chip 2 can be separated from an antenna 6 having a second form that cannot be directly joined to the I/O terminal of the IC chip, thus achieving the radio tag that can be managed at the same communication frequency even if the environment is changed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内部に少なくとも1つのICチップ、及びアンテナを有し、データを無線で通信することが可能な無線タグに関するものである。 The present invention, at least one IC chip inside, and an antenna, to an RFID tag capable of communicating data wirelessly.

情報を記憶出来るICチップとアンテナからなる無線タグは、電波を介して、質問器またはリーダと呼ばれる無線機とデータを送受信することができる。 Wireless tag comprising an IC chip and an antenna that can store information, via radio waves, can be transmitted and received radio and data called interrogator or reader. このような無線タグは、たとえば特許文献1に示されている。 Such wireless tags, for example, in Patent Document 1. そのうち特に、電波の周波数として300MHz以上を使用し、内部に電源を持たない無線タグは、リーダライタとの通信可能距離が長く、価格も比較的廉価であることから、バーコードの置き換え用途への利用などが検討されている。 Among them in particular, using the above 300MHz the frequency of the radio wave, the wireless tag does not have a power source therein, the communication distance between the reader-writer is long, since the price is relatively inexpensive, to the bar code replacement applications It has been studied, such as use. このような内部に電源を持たない無線タグは、たとえば特許文献2に示されている。 RFID tags such not internally have the power, for example, in Patent Document 2.

無線タグ内部にICを駆動する電源を持たない場合は、リーダライタからの電波をIC内部のダイオードやコンデンサにより直流に変換して電圧を得る方式が取られる。 If you do not have the power for driving the IC within the wireless tag, it is a method of obtaining the voltage taken by converting the radio wave from the reader writer to the DC by IC internal diode and a capacitor. また、無線タグ内部に上記電源を持つ場合は、ボタン型電池やフィルム状電池、大容量のコンデンサなどがIC駆動用電源として用いられる。 Also, if you have the power within the wireless tag, a button type battery or a film-like battery, a large-capacity capacitor is used as the power drive IC.

無線タグと、リーダとの通信に使用される電波は、一般的に送信電力が大きくなるに従い、無線タグとリーダとの通信距離が長くなり、周波数が低くなるに従い、空気中の伝播損失が小さくなるために通信距離が長くなる。 And the wireless tag, radio waves used for communication with the reader, in accordance with generally transmit power increases, the communication distance between the wireless tag and the reader is increased, as the frequency becomes lower, the propagation loss in the air is small communication distance to become longer. ところが、使用出来る電波の周波数とその出力レベルに関しては、国ごとに定められた規制値があり、それぞれの国で定められた規制値のなかで、最大の効果が得られるような周波数、送信電力が選ばれ、無線タグとリーダライタとの通信系が設計される。 However, the terms its output level frequency of the radio wave can be used, there are standards set for each country, among the standards set by each country, the frequency, such as the maximum effect can be obtained, the transmission power is selected, the communication system of the wireless tag and the interrogator is designed.

図11は、従来の無線タグの一例を示す斜視図である。 Figure 11 is a perspective view showing an example of a conventional wireless tag. 基材5の上に粘着層7を介して、アンテナ3及びICチップ2を形成してなる基材4を設け、無線タグ11を構成している。 Via an adhesive layer 7 on the substrate 5, the provided substrate 4 obtained by forming the antenna 3 and the IC chip 2 and constitute the wireless tag 11. この無線タグ11は、基材5剥離前の状態で、アンテナ3を用いて通信を行い、ICチップ2に情報を記録または再生することにより、無線タグ11自体の管理を行い、その後、基材5部分を剥離除去し、粘着層7を介して、基材4部分のみを管理する物品に貼付し、物品の管理等の使用に供していた。 The wireless tag 11 is a substrate 5 peeling previous state performs communication using the antenna 3, by recording or reproducing information on the IC chip 2 performs wireless tag 11 itself management, then, the substrate 5 parts peeled off and removed, via the adhesive layer 7, attached to the article to manage only substrate 4 portions and was provided for use in management of articles.

一般的に無線タグは、無線タグ単体すなわち自由空間にある状態で最適な特性が得られるようにアンテナが設計され、標準品とされている。 Generally radio tag antenna is designed for optimal characteristics can be obtained in the presence of the wireless tag alone or free space, there is a standard. 従って、図11に示す従来の無線タグ11は、基材5除去前の状態で、アンテナ3とICチップ2はインピーダンス整合するよう設計されている。 Thus, conventional wireless tag 11 shown in FIG. 11, in a state before the substrate 5 is removed, the antenna 3 and the IC chip 2 is designed to impedance match. 無線タグ11から基材5を剥離し、粘着層7を介して基材4部分を、例えば誘電率の高い樹脂で形成された管理する物品に貼付して使用した場合は、前記物品を構成する樹脂の誘電率によりアンテナ3のインピーダンスが変化することにより、ICチップ2とのインピーダンス不整合が生じて、読み取り性能の低下や、場合によっては通信不能等の現象が生じることもあった。 Peeling the substrate 5 from the wireless tag 11, when using a substrate 4 moiety through an adhesive layer 7, for example, attached to an article to be managed, which is formed by a high dielectric constant resin, constituting the article by the impedance of the antenna 3 is changed by the dielectric constant of the resin, caused impedance mismatching between the IC chip 2, decrease in reading performance, in some cases there is also a phenomenon such as a communication failure occurs.

また、貼付場所の近辺に金属が配されている物品においても、同様に干渉が生じてアンテナ3のインピーダンスが変化し、読み取り性能が低下するという不具合があった。 Also in the article that metal is arranged in the vicinity of the sticking place, likewise interference impedance of the antenna 3 is changed occurs, the reading performance was inconveniently reduced.

そこで、管理する物品の材質や使用環境を考慮して、すなわち、例えば当該物品の誘電率や周囲に配された金属材料等の影響をあらかじめ考慮して、アンテナ形状を最適化した無線タグを設計する場合もあった。 Therefore, in consideration of the article material and the use environment to manage, i.e., for example, in consideration of the influence of the metal material such as dielectric constant and disposed on the periphery of the article beforehand, an optimized wireless tag antenna shape design If it is there also. このような設計の場合には、図11において、基材5を除去してなる無線タグ11は、管理する物品に貼付した後は、通信が可能かつ通信性能が良好ではあるが、物品に貼付する前の基材5を備えた無線タグ11の状態では、アンテナ3のインピーダンスとICチップ2のインピーダンスが整合しておらず、通信性能が低下するので上述内容と同様の不具合を生じていた。 In the case of such a design is, in FIG. 11, the wireless tag 11 formed by removing the substrate 5, after stuck to an article to be managed, although communication is possible and communication performance is as good, affixed to the article in the state of the wireless tag 11 having a substrate 5 prior to the impedance of the impedance and IC chip 2 of the antenna 3 is not aligned, communication performance has occurred a problem similar to the above content so reduced.

特許2553641号公報 Patent 2553641 No. 特開2002−298106号公報 JP 2002-298106 JP

本発明の技術的課題は、使用環境が変化しても通信状態が良好な無線タグを提供することにある。 The technical problem of the present invention is to be used environment is changed communication state to provide a good radio tag.

本発明によれば、1以上のICチップ、および2以上のアンテナを有する無線タグであって、前記アンテナは、前記ICチップの入出力端子と直接接合された第一の形態のアンテナと、前記ICチップの入出力端子と直接接合されない第二の形態のアンテナからなり、前記第一の形態のアンテナと第二の形態のアンテナは分離可能に構成されてなることを特徴とする無線タグが得られる。 According to the present invention, there is provided a wireless tag having one or more IC chips, and two or more antennas, wherein the antenna, the antenna of the first embodiment joined directly with the input and output terminals of the IC chip, the It consists antenna of a second form not bonded directly to the output terminals of the IC chip, a wireless tag the first embodiment of the antenna and the antenna of the second embodiment is characterized by comprising is configured to be separated to give It is.

本発明によれば、前記第一の形態のアンテナと第二の形態のアンテナは、異なる基材に形成されてなることを特徴とする無線タグが得られる。 According to the present invention, the first embodiment of the antenna and the antenna of the second embodiment, the wireless tag, characterized by comprising formed on different substrates can be obtained.

本発明の無線タグは、少なくとも1つのICチップの入出力端子と直接接合された第一の形態のアンテナと、ICチップの入出力端子と直接接合されない第二の形態のアンテナからなる。 Wireless tag of the present invention comprises at least one antenna of the first embodiment joined IC chip input and output terminals and direct, in the second embodiment which is not bonded directly to the output terminals of the IC chip antenna. 前記第一の形態のアンテナと第二の形態のアンテナはそれぞれ基材の上に形成された導電性物質からなり、第一の形態のアンテナと第二の形態のアンテナは分離可能に構成する。 The first embodiment of the antenna and the antenna of the second embodiment is made of a conductive material formed on each substrate, the antenna of the antenna and the second form of the first embodiment is configured to be separated.

前記第一の形態のアンテナと、前記第二の形態のアンテナは、同一の基材の同一表面もしくは表裏に形成されていても良く、またそれぞれ異なる基材に形成されていても良い。 An antenna of the first embodiment, the second form of the antenna may be formed on the same surface or the front and back of the same substrate, or may be formed on different substrates, respectively. 前記第一の形態のアンテナと第二の形態のアンテナが同一基材に形成されている場合は、基材に切り込みやミシン目等の容易に切断可能な手段をあらかじめ設けておくのが好ましい。 Wherein if the first embodiment of the antenna and the antenna of the second embodiment are formed on the same substrate is preferably provided in advance easily cleavable unit such as cuts or perforations in the substrate. 前記第一の形態のアンテナと第二の形態のアンテナは異なる基材に形成されてなる場合は、粘着層を設けるなどの接着手段、または基板同士の嵌合手段や別部材を用いた結合手段を設けることにより、一体に構成しつつも、必要に応じて容易に剥離または分離できるような構成とするのが好ましい。 Wherein a first embodiment of the antenna when the second form of the antenna is made is formed on the different substrates, the adhesive means such as providing an adhesive layer or coupling means using an engagement means or another member between the substrates, by providing, even while configured integrally, preferably with as easily peeled or separated as required configuration.

ICチップと前記第一の形態のアンテナは、管理する物品に貼付した状態で最良の特性が得られるように、つまり、管理する物品の材質や条件を考慮して、アンテナを最適化する。 IC chip and the antenna of the first embodiment, as the best properties are obtained in a state of being attached to an article to be managed, that is, in consideration of the material and condition of the article to be managed to optimize the antenna. 無線タグを前記物品に貼付する際には、前記第二の形態のアンテナを無線タグから分離して第一の形態のアンテナ部分を使用する。 When attaching the wireless tag to the article, using the antenna portion of the first embodiment by separating the antenna of the second embodiment from the wireless tag.

一方、前述のように構成すると、管理する物品に貼付する前の状態では、必ずしも、第一の形態のアンテナは、ICチップと最適値でインピーダンス整合しておらず、通信性能が良好でない場合も生じる。 On the other hand, when constructed as described above, before the affixed to an article to be managed, not necessarily, the antenna of the first embodiment is not in impedance matching with an IC chip and the optimum value, even if the communication performance is not good occur. そこで、このような場合は、第一の形態のアンテナ近傍に第二の形態のアンテナを形成し、管理する物品に貼付しない状態でも、ICチップとアンテナ全体のインピーダンス整合が最適値となるよう構成する。 Therefore, in such a case, near the antenna of the first embodiment to form an antenna of the second embodiment, even when not attached to an article to be managed, so that IC chip and an antenna total impedance matching is optimal value configuration to. このように構成することで、管理する物品に貼付しない状態においては、ICチップと第一の形態のアンテナおよび第二の形態のアンテナが協働して、一定の距離での通信状態を良好に保ち、かつ、管理する物品に貼付した状態においても、第二の形態のアンテナを除去してアンテナインピーダンスを変更することにより、一定の距離での通信状態を良好に保つことが可能な無線タグが得られる。 With this configuration, in the state of not affixed to the article to be managed, IC chip and by an antenna cooperate antenna and the second embodiment of the first aspect, a favorable communication state at a certain distance maintaining, and, even in a state where affixed to an article to be managed, by changing the antenna impedance by removing the antenna of the second embodiment, a wireless tag that can maintain a good communication state at a certain distance can get.

本発明により、管理する物品に貼付する前と後のいずれの状態であっても、同一周波数帯での通信性能が良好な無線タグの提供が可能となった。 The present invention, in either state before and after affixing to the article to be managed, the communication performance in the same frequency band become possible to provide a good radio tag.

本発明による無線タグは、ICチップと、該ICチップと電気的に接続してなる第一の形態のアンテナ、およびICチップと電気的に接続していない第二の形態のアンテナを有する。 Wireless tag according to the invention comprises an IC chip, the first embodiment formed by connecting the IC chip and electrically antennas, and the antenna of the second embodiment which is not connected IC chip and electrically. 第一の形態のアンテナとICチップは、最終的に管理する物品に貼付して使用に共されるので、管理する物品に貼付した状態で、第一の形態のアンテナとICチップのインピーダンスが整合するように構成する。 Antenna and IC chip of the first embodiment, since by attaching to an article to be finally managed are co use, while attached to the article to be managed, the impedance of the antenna and the IC chip of the first embodiment is matched configured to. つまり、前記第一の形態のアンテナとICチップの単純なインピーダンス整合を行うのではなく、管理する物品による電波の干渉を考慮してICチップとインピーダンス整合するように第一の形態のアンテナを構成する。 That is, constituting the first embodiment of the antenna and instead of performing simple impedance matching of the IC chip, the antenna of the first embodiment so that the IC chip and impedance matching in consideration of the interference of radio waves due to an article to be managed to. また、例えば工場出荷時や流通時には、管理する物品に貼付しない状態で、良好な通信状態を保つ必要があるため、第一および第二のアンテナの複合アンテナがICチップとインピーダンス整合するよう構成する。 Further, for example, at the time of factory shipment or distribution, with no affixed to an article to be managed, since it is necessary to maintain good communication state, the composite antenna of the first and second antennas configured to IC chip and impedance matching .

第一および第二の形態のアンテナは、例えばガラスエポキシ基板やPET(ポリエチレンテレフタレート)、ポリイミド等の樹脂や紙からなる基材上に、銅やアルミ、銀等の導電体を用いて、エッチング手法、印刷等の一般的なアンテナ形成手段により形成する。 Antenna of the first and second embodiment, for example, a glass epoxy substrate or a PET (polyethylene terephthalate), on a resin or of paper substrates such as polyimide, with copper or aluminum, a conductor such as silver, etching technique , formed by a general antenna forming means such as printing. また、第一の形態のアンテナは、例えばICチップとワイヤボンディングやフリップチップ実装技術等の一般的な実装技術により電気的に接続する。 The antenna of the first embodiment is electrically connected by for example, an IC chip and wire bonding or flip-chip mounting technique common implementation techniques, and the like.

前記第一の形態のアンテナと第二の形態のアンテナが異なる基材に形成されてなる場合は、例えば前記基材間に接着剤や粘着剤を塗布して一体と成すが、容易に剥離または分離でき、さらに樹脂、金属、紙等の物品に容易に再接着できる程度の接着力や粘着力を有する粘着層を設けるのが好ましい。 Wherein a first embodiment of the antenna when the antenna of the second embodiment formed by formed on different substrates is, for example, form To integrally by applying an adhesive or a pressure-sensitive adhesive between the substrate, easily peeling or separation can be further resin, metal, preferably provided an adhesive layer having adhesive force or adhesive strength of the extent that easy re-adhered to articles, such as paper. また、基材同士に凹凸やフック状の嵌合構造を持たせるもしくはクリップやピン等のアンテナ特性に影響を及ぼさない別部材による結合手段を用いて一時的に一体と成してもよい。 Further, the coupling means according to another member temporarily may form To integrally with not affecting the antenna characteristics of the or clips, pins or the like to have a fitting structure of irregularities and hooked to the base material to each other.

前記第一の形態のアンテナと第二の形態のアンテナが同一基材に形成されてなる場合は、例えば、二つの形態のアンテナを容易に分離可能なように、切り込み、溝、ミシン目をあらかじめ設けておくのが好ましい。 If the first embodiment of the antenna and the antenna of the second embodiment is formed in the same substrate, for example, so as to be easily separated antennas of the two forms, cuts, grooves, perforations beforehand the preferred keep provided with. また、第一の形態のアンテナが形成された基材は、例えばパンチ穴をあけてひもを通しで管理する物品に取り付ける、あらかじめ粘着層を設ける、両面テープを用いる、接着剤を用いる等の一般的な手段で管理する物品に貼付または付設するのが好ましい。 Furthermore, the substrate antenna of a first embodiment is formed, for example, to punch holes attached to an article to be managed in through the string, previously providing an adhesive layer, using a double-sided tape, generally, such an adhesive preferably affixed or attached to the article to be managed by means.

本発明による無線タグは、あらかじめ管理する物品の材質・構成・周辺環境を考慮して設計構成されるが、同一物品であっても、管理する物品の構成や周辺環境によっては、電波の干渉条件が異なるため、必要に応じて、無線タグの一部を該物品に貼付または付設する位置を特定して使用に供するのが好ましい。 Wireless tag according to the invention, designed constructed in consideration of the material and structure and the surrounding environment of the article in advance managed, even in the same article, depending on the article of construction and the surrounding environment to manage, radio interference conditions because of different optionally preferably subjected to identify and use a patch or attached located article a portion of the wireless tag.

以下、本発明の実施例について図面を参照しながら説明する。 It will be described below with reference to the accompanying drawings embodiments of the present invention.

(実施例1) (Example 1)
図1、図2および図3は、本発明の第一の実施例を示す図である。 1, 2 and 3 are diagrams showing a first embodiment of the present invention. 図1は本発明の無線タグの斜視図、図2は図1に示した無線タグ1の正面図、図3は管理する物品に貼付する場合の無線タグの説明図である。 Figure 1 is a perspective view of a wireless tag of the present invention, FIG. 2 is a front view of the wireless tag 1 shown in FIG. 1, FIG. 3 is an explanatory diagram of a wireless tag when affixed to an article to manage. ポリエチレンテレフタレート(以下PETと表記)からなる基材4上に、導電体としてアルミニウムを用いてエッチング手法により第一の形態のアンテナ3(以下アンテナ3と表記)を形成し、アンテナ3とICチップ2はフリップチップ実装手段により電気的に接続した。 On a base material 4 made of polyethylene terephthalate (hereinafter PET hereinafter), aluminum was used to form the antenna 3 of the first embodiment (hereinafter antenna 3 hereinafter) by etching techniques as a conductor, the antenna 3 and the IC chip 2 It was electrically connected by flip chip mounting means. 無線タグ1は、工場出荷後、レストランに納入され、管理する物品であるABS樹脂製トレイに貼付して、商品管理を行うことを鑑みて、ABS樹脂に貼付された場合にICチップ2とインピーダンスが整合するように、前記アンテナ3を調整し形成した。 Wireless tag 1, after factory shipment, delivered to restaurants, and affixed to the ABS resin tray is an article to be managed in light to make the product management, IC chip 2 when affixed to the ABS resin and the impedance so it is aligned, to form and adjust the antenna 3.

次に、PETよりなる基材5表面に導電体としてアルミウムを用いてエッチング手法により、第二の形態のアンテナ6(以下アンテナ6と表記)を図1および図2に示すように形成した。 Next, by etching technique using Arumiumu as a conductor on the substrate 5 surface made of PET, to form the antenna 6 of the second embodiment (hereinafter antenna 6 hereinafter) as shown in FIGS. このとき、前記アンテナ6は、図1および図2に示す無線タグ1の状態で、前記アンテナ3と共に複合アンテナとして機能した場合に、ICチップ2とインピーダンス整合するように調整し形成した。 At this time, the antenna 6, in the state of the wireless tag 1 shown in FIGS. 1 and 2, when functioning as a composite antenna together with the antenna 3, were adjusted to form to the IC chip 2 and the impedance matching.

なお、前記基材4および基材5は、各々アンテナ3およびアンテナ6が形成されていない面同士で、容易に剥離しうる粘着層7を介して当接させて一体となし、無線タグ1を作成した。 Incidentally, the base material 4 and the substrate 5 are each antenna 3 and surface contact of the antenna 6 is not formed, without To integrally easily peeled off can via an adhesive layer 7 is brought into contact, the wireless tag 1 Created.

この無線タグ1は、図1および図2に示す状態で、出荷・搬送データを記録再生して納入管理を行い、レストラン納入後に図3に示すように基材5を分離除去し、無線タグ残部8のみを管理する物品に貼付して販売管理を行った。 The wireless tag 1, in the state shown in FIGS. 1 and 2, performs delivery management by recording the shipping and transportation data, a substrate 5 as shown in FIG. 3 is separated and removed after a restaurant delivery, RFID balance sales management was carried out by attaching to an article that manages the 8 only. 納入管理および販売管理のいずれの場合も、通信周波数は2.45GHzを使用し、通信状態は極めて良好であった。 For both delivery management and sales management, communication frequency uses a 2.45 GHz, a communication state was very good.

図4に、ICチップ2のインピーダンス特性を示す。 Figure 4 shows the impedance characteristics of the IC chip 2. 9aはインピーダンスの実数部、9bはインピーダンスの虚数部を示している。 9a is the real part of the impedance, 9b represents the imaginary part of the impedance. 使用する通信周波数f0におけるICチップ2のインピーダンスは、実数部9aが20Ω、虚数部9bが−40Ωである。 Impedance of the IC chip 2 in the communication frequency f0 to be used, the real part 9a is 20 [Omega, the imaginary part 9b is -40Omu. 無線タグ1のアンテナは、ICチップ2とインピーダンス整合するように設計される。 Wireless tag 1 of the antenna is designed to IC chip 2 and the impedance matching. ここで、インピーダンスの整合条件は、アンテナインピーダンスがICチップのインピーダンスの共役複素数になることである。 Here, matching conditions of the impedance is that the antenna impedance is a complex conjugate of the impedance of the IC chip.

図5に、無線タグ1の状態、すなわちアンテナ3とアンテナ6を組み合わせたときの複合アンテナインピーダンスを示す。 Figure 5 illustrates the wireless tag 1 state, ie the composite antenna impedance when combining antennas 3 and 6. 使用する通信周波数f0におけるインピーダンスは、実数部9aが20Ω、虚数部9bが42Ωである。 Impedance at the communication frequency f0 to be used, the real part 9a is 20 [Omega, the imaginary part 9b is 42Omu. 図4に示したICチップ2のインピーダンスと比較すると、使用する通信周波数f0においてインピーダンス整合していることがわかる。 Compared to the impedance of the IC chip 2 shown in FIG. 4, it can be seen that the impedance matching at the communication frequency f0 used.

図6に、図3に示した無線タグ残部8を管理する物品に貼付した状態でのアンテナインピーダンスを示す。 Figure 6 shows an antenna impedance while attached to an article managing radio tag remainder 8 shown in FIG. この場合、周波数特性は図5と異なるが、使用する通信周波数f0においては実数部9aが18Ω、虚数部9bが45Ωとなり、ICチップ2とほぼインピーダンス整合していることがわかる。 In this case, the frequency characteristic is different from FIG. 5, it can be seen that almost impedance matching real part 9a is 18Omu, imaginary part 9b is next 45 [Omega, the IC chip 2 in the communication frequency f0 used.

比較例として、実施例1とアンテナ構成のみ異なる、図11の構成を有する無線タグ1を作製した。 As a comparative example, only differ in Example 1 and the antenna configuration, to produce a radio tag 1 having the structure of FIG. 11. アンテナ3は、無線タグ1から基材5を除去した状態でICチップ2とインピーダンスが整合するよう調整した。 Antenna 3, IC chip 2 and the impedance was adjusted to be consistent with a state of removing the substrate 5 from the wireless tag 1.

図7に、比較例の無線タグ11の管理する物品に貼付する前の状態におけるインピーダンス特性を示す。 Figure 7 shows the impedance characteristics in the state before attaching the article to be managed in the wireless tag 11 of the comparative example. 使用する通信周波数f0において、実数部9aが2Ω、虚数部9bが−58Ωとなっており、図4に示したICチップ2のインピーダンス特性と整合しないことがわかる。 In communication frequency f0 used, the real part 9a is 2 [Omega, the imaginary part 9b has a -58Omu, it can be seen that does not match the impedance characteristics of the IC chip 2 shown in FIG. この場合の不整合損失は計算上18dBとなり、管理する物品に貼付して使用した場合と比較すると、通信距離は8分の1と短くなり、良好な通信状態を保つことができなかった。 Mismatch loss computational 18dB next in this case, when compared to the use by attaching the article to be managed, the communication distance becomes short as 1/8, it was not possible to maintain good communication state.

図8は、本発明の効果を示す説明図である。 Figure 8 is an explanatory diagram showing the effect of the present invention. 図8(a)は、実施例1による基材5除去前の無線タグ1とリーダライタ12の通信距離14を示している。 FIG. 8 (a) shows the communication distance 14 of Example wireless tag 1 before the substrate 5 is removed by 1 and the reader-writer 12. 図8(b)は基材5除去後の無線タグ残部8を管理する物品10に貼付した状態での通信距離15を示している。 Figure 8 (b) shows the communication distance 15 while attached to the article 10 to manage the wireless tag remainder 8 after the substrate 5 is removed. 通信距離14と通信距離15は、ほぼ等しいことがわかる。 Communication distance 14 and the communication distance 15, it can be seen that approximately equal. 図9は、比較例の無線タグ11による通信距離を説明する図である。 Figure 9 is a diagram for explaining the communication distance due to the wireless tag 11 of the comparative example. 無線タグ11は、管理する物品に合わせてアンテナを最適化しているので、図9に示すように、管理する物品に貼付しない状態では、本発明による効果を示す図8(a)の通信距離14に比べて通信距離16が極端に短くなっている。 The wireless tag 11, since in accordance with the article to be managed are optimized antenna, as shown in FIG. 9, when no affixed to an article to be managed, the communication distance in FIG. 8 showing the effect of the present invention (a) 14 communication distance 16 compared to have become extremely short.

(実施例2) (Example 2)
図10は、本発明の第二の実施例を示す斜視図である。 Figure 10 is a perspective view showing a second embodiment of the present invention. ガラスエポキシからなる基材4上に、導電体として銅ペーストを用いて印刷手法により第一の形態のアンテナ3(以下アンテナ3と表記)を形成し、ICチップ2とワイヤボンディングにより電気的に接続した。 On a substrate 4 made of glass epoxy, a conductive copper paste first embodiment of the antenna 3 (hereinafter antenna 3 hereinafter) by a printing method using the formation, electrically connected by the IC chip 2 and the wire bonding did. 無線タグ1は、工場出荷後、楽器店に納入され、管理する物品である音楽用コンパクトディスク(以下CDと表記)ケースに貼付して、商品管理を行うことを鑑みて、CDケースの材質であるポリスチレン樹脂およびCD表面に蒸着されたアルミニウム薄膜による電波の干渉が発生しても、ICチップ2とインピーダンスが整合するように、前記アンテナ3を調整し形成した。 Wireless tag 1, after the factory, is delivered to the music store, by attaching compact disc for an article to manage music (hereinafter CD and notation) case, in view to make a merchandise management, a material of the CD case even if radio interference occurs due to an aluminum thin film deposited to a polystyrene resin and CD surface, as IC chip 2 and the impedance matching, thereby forming adjusted the antenna 3.

次に、前記基材4に導電体として銅ペーストを印刷した第二の形態のアンテナ6(以下アンテナ6と表記)を図10に示すように形成した。 Next, to form the antenna 6 of the second embodiment was printed copper paste as a conductor on the substrate 4 (hereinafter antenna 6 hereinafter) as shown in FIG. 10. このとき、前記アンテナ6は、図10に示す無線タグ1の状態で、前記アンテナ3と共に複合アンテナとして機能した場合にICチップ2とインピーダンス整合するように調整し形成した。 At this time, the antenna 6, in the state of the wireless tag 1 shown in FIG. 10 was formed was adjusted to IC chip 2 and the impedance matching when to function as a composite antenna together with the antenna 3.

この無線タグ1は、図10に示す状態で、出荷・搬送データを記録再生して納入管理を行い、楽器店納入後にミシン目13でアンテナ3を形成してなる基材部分とアンテナ6を形成してなる基材部分を分離し、アンテナ3を形成してなる基材部分のみを両面テープを用いてCDケースに貼付して販売管理を行った。 The wireless tag 1, in the state shown in FIG. 10, performs a delivery management by recording the shipping and transportation data, a base portion and the antenna 6 formed by forming the antenna 3 in perforation 13 after the music store delivery form and separating the substrate portion made were sales management only substrate portions formed by forming the antenna 3 by attaching the CD case using double-sided tape. 納入管理および販売管理のいずれの場合も、通信周波数は950MHzを使用し、通信状態は極めて良好であった。 For both delivery management and sales management, communication frequency uses a 950 MHz, the communication condition was very good.

以上、例を挙げて、本発明の実施例を説明したが、この発明は、これらの実施例に限られるものではなく、この発明の要旨を逸脱しない範囲の設計変更があっても本発明に含まれる。 Above, by way of example, has been described an embodiment of the present invention, the invention is not limited to these embodiments, even the present invention if there is design change without departing from the scope of the invention included. すなわち、例えば、導電性インキでロゴや注意書を印刷して、それを第二の形態のアンテナとしても利用する等の、当業者であれば、当然なしえるであろう各種変形、修正もまた本発明に含まれることは勿論である。 That is, for example, by printing a logo or notice of a conductive ink, also such that also use it as an antenna of the second embodiment, those skilled in the art will be appreciated that shell various variations, modifications, it is included in the present invention as a matter of course.

本発明の無線タグを用いることにより、商品等の流通管理、販売管理、在庫管理、利用状況管理に代表される多様な物品の管理において、管理する物品の材質や使用環境等に適したシステムを簡便に構築することができる。 By using the wireless tag of the present invention, distribution management of products such as sales management, inventory management, the management of a variety of articles typified by usage management, the system suitable for the material and use environment and the like of the article to be managed it can be constructed easily.

本発明の実施例による無線タグを示す斜視図である。 Is a perspective view showing a wireless tag according to an embodiment of the present invention. 本発明の実施例による無線タグを示す正面図である。 It is a front view showing a wireless tag according to an embodiment of the present invention. 本発明の実施例による無線タグの使用状態を示す説明図である。 It is an explanatory diagram showing a use state of the wireless tag according to an embodiment of the present invention. 本発明の実施例に用いたICチップのインピーダンス特性を示す図である。 Is a diagram showing the impedance characteristics of the IC chip used in an embodiment of the present invention. 本発明の実施例によるアンテナのインピーダンス特性を示す図である。 Is a diagram showing the impedance characteristic of the antenna according to an embodiment of the present invention. 本発明の実施例によるアンテナのインピーダンス特性を示す図で、管理する物品に貼付した状態の特性を示す。 A diagram showing the impedance characteristic of the antenna according to an embodiment of the present invention, showing a characteristic of a state of sticking to the article to be managed. 比較例のアンテナのインピーダンス特性を示す図である。 Is a diagram showing the impedance characteristic of the antenna of the comparative example. 本発明の実施例の効果を説明する図で、図8(a)は、物品に貼付する前の状態を示し、図8(b)は、物品に貼付した後の状態を示す。 A view for explaining the effect of the embodiment of the present invention, FIG. 8 (a) shows a state before attaching the article, FIG. 8 (b) shows a state after affixed to an article. 比較例の通信距離を説明する図で、物品に貼付する前の状態を示す。 A view for explaining the communication distance of the comparative example, showing a state before attaching the article. 本発明の実施例による無線タグを示す斜視図である。 Is a perspective view showing a wireless tag according to an embodiment of the present invention. 従来の無線タグを示す斜視図である。 It is a perspective view showing a conventional wireless tag.

符号の説明 DESCRIPTION OF SYMBOLS

1,11 無線タグ2 ICチップ3 第一の形態のアンテナ4,5 基材6 第二の形態のアンテナ7 粘着層8 無線タグ残部9a インピーダンスの実数部9b インピーダンスの虚数部10 管理する物品12 リーダライタ13 ミシン目14,15,16 通信距離 1,11 wireless tag 2 IC chip 3 first embodiment of the antenna 4,5 substrate 6 second embodiment of the antenna 7 adhesive layer 8 RFID remainder 9a impedance real part 9b impedance imaginary part 10 managed article 12 reader writer 13 perforations 14, 15, 16 communication distance

Claims (2)

  1. 1以上のICチップ、および2以上のアンテナを有する無線タグであって、前記アンテナは、前記ICチップの入出力端子と直接接合された第一の形態のアンテナと、前記ICチップの入出力端子と直接接合されない第二の形態のアンテナからなり、前記第一の形態のアンテナと第二の形態のアンテナは分離可能に構成されてなることを特徴とする無線タグ。 One or more IC chips, and a wireless tag having two or more antennas, wherein the antenna, the antenna of the first embodiment joined directly with the input and output terminals of the IC chip, input and output terminals of the IC chip When made from an antenna of a second form not bonded directly, radio tag the first embodiment of the antenna and the antenna of the second embodiment is characterized by comprising formed so as to be separable.
  2. 前記第一の形態のアンテナと第二の形態のアンテナは、異なる基材に形成されてなることを特徴とする請求項1記載の無線タグ。 The first embodiment of the antenna and the antenna of the second embodiment, the wireless tag according to claim 1, characterized by being formed on different substrates.
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