JP2003187207A - Electrode structure of tag for rfid and method for adjusting resonance frequency using the same electrode - Google Patents

Electrode structure of tag for rfid and method for adjusting resonance frequency using the same electrode

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JP2003187207A
JP2003187207A JP2001382638A JP2001382638A JP2003187207A JP 2003187207 A JP2003187207 A JP 2003187207A JP 2001382638 A JP2001382638 A JP 2001382638A JP 2001382638 A JP2001382638 A JP 2001382638A JP 2003187207 A JP2003187207 A JP 2003187207A
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electrode
comb
resonance frequency
finger
fingers
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JP3700777B2 (en
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Shinichiro Inui
Koichi Ishiyama
Satoshi Uozumi
信一郎 乾
宏一 石山
学司 魚住
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Mitsubishi Materials Corp
三菱マテリアル株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode structure of a tag for RFID (radio frequency identification) by which a resonance frequency of a resonant circuit to be formed on the tag for RFID can be easily adjusted after formation of the circuit and a method for adjusting the resonance frequency using the electrode. <P>SOLUTION: In an RFID system for communicating data between a reader/ writer and the tag by using electromagnetic induction, a comb-line electrode 7 of a capacitor constituting the resonant circuit of the tag and a counter electrode 8 to be formed on the opposite side by sandwiching a substrate are formed so that area of an overlapped part between each finger 7b of the comb-line electrode 7 and the counter electrode 8 gradually becomes small from the tip side to the root side of the comb-line electrode 7, for example, the counter electrode 8 is formed like a taper and shift quantity of the resonance frequency when the fingers 7b are successively cut off is set as approximately equivalent values. Thus, the number of fingers to be cut off is directly determined from the shift quantity from desired resonant frequency and an adjustment work of the resonant frequency is facilitated. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、共振回路を構成するコンデンサの電極構造及び該電極を用いた共振周波数の調整方法に関し、特に、容易に共振周波数の調整が可能なRFID(Radio Frequency Identification)用タグの櫛型電極の形状及び該櫛型電極を用いた共振周波数の調整方法に関する。 BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to a method of adjusting the resonant frequency using the electrode structures and the electrodes of the capacitor constituting a resonant circuit, in particular, readily resonant frequency adjustment method for adjusting the resonance frequency with the possible RFID (Radio frequency Identification) for the shape and the comb-type electrodes of the comb electrodes of the tag. 【0002】 【従来の技術】近年、ICチップを備えたタグとリーダ/ライタ(又はリーダ)との間でデータの交信を行うR [0002] In recent years, R which communicates data between the tag and the reader / writer with an IC chip (or readers)
FIDシステムが普及している。 FID system is widespread. このRFIDシステムは、タグ及びリーダ/ライタの各々に備えたアンテナを用いてデータの交信を行うため、タグをリーダ/ライタから数cm乃至数十cm離しても通信可能であり、また、汚れや静電気等に強いという長所から、工場の生産管理、物流の管理、入退室管理等の様々な分野に利用されるようになってきている。 The RFID system, since which communicates data by using the antenna with the respective tags and the reader / writer, even apart several cm to several tens cm tags from the reader / writer can communicate, also, dirt Ya from the advantage of strong to static electricity or the like, the production management of the plant, management of logistics, have come to be used in a variety of fields, such as entry and exit management. 【0003】このタグの基本的な回路要素は、アンテナコイルとコンデンサからなる共振回路とICチップとであり、所望する周波数帯域(例えば、13.56MH [0003] The basic circuit elements of this tag is in the resonant circuit and IC chip comprising an antenna coil and a capacitor, a desired frequency band (e.g., 13.56MH
z)でデータの交信を行うには、共振回路を構成するアンテナコイルのインダクタンスLとコンデンサの静電容量Cとで設定される共振周波数fを上記周波数に正確に調整する必要がある。 To communicates data at z), it is necessary to adjust accurately the resonant frequency f which is set by the capacitance C of the inductance L and the capacitor of the antenna coil constituting the resonant circuit to the frequency. 【0004】ここで、タグとしてラベル型タグを用いる場合は、フレキシブルなシート状の基板の一方の面にアンテナコイルを形成し、他方の面にアンテナコイルと対向する電極を形成して、基板を誘電体とするコンデンサを形成する。 [0004] Here, the case of using the label tag as the tag, the antenna coil is formed on one surface of a flexible sheet-like substrate, by forming the antenna coil and the opposing electrodes on the other surface, the substrate forming a capacitor of the dielectric. そして、アンテナコイルの巻き数や面積によりインダクタンスを調整し、対向する電極の重なり部分の面積や電極間の距離により静電容量を調整する。 Then, by adjusting the inductance by winding number and area of ​​the antenna coil, to adjust the capacitance by the distance between the area and the electrodes of the overlapping portion of the opposing electrode. 【0005】これらアンテナコイルの巻き数や面積、対向する電極の重なり部分の面積等は、基本的にタグの設計段階において設定されるものであり、設計値通りにアンテナコイルやコンデンサが形成されれば、所望の共振周波数を有するタグを製造することができる。 [0005] area and the like of the overlapped portion of the winding number and area, opposing electrodes of the antenna coil, which is set at the design stage of the basically tag, it antenna coils and capacitors are formed as designed if, it is possible to manufacture a tag having a desired resonant frequency. 【0006】 【発明が解決しようとする課題】これらのアンテナコイルやコンデンサは、フレキシブルなシート状の基板の両面に予め形成されている導電膜をウェットエッチングにより除去するか、又はスクリーン印刷等により導電ペーストを印刷して形成されるが、例えば、ウェットエッチングではエッチングマスク下部の電極端部が徐々にエッチングされてしまうためにパターン寸法にある程度の誤差が生じる。 [0006] These antenna coils and capacitors [0005] is a conductive film is previously formed on both surfaces of the flexible sheet-like substrate or is removed by wet etching, or conductive by screen printing or the like are formed by printing a paste, for example, a certain degree of error in the pattern dimension in the electrode end portion of the lower etch mask from being gradually etched by wet etching. また、スクリーン印刷の寸法精度や基板の厚さ等の種々の要因により、アンテナコイルやコンデンサの形状、構造が変化し、所望の共振回路を形成することができない。 Further, due to various factors such as the thickness of the dimensional accuracy and the substrate of the screen printing, the shape of the antenna coil and a capacitor, the structure is changed, it is impossible to form a desired resonant circuit. 【0007】そこで、製造上の要因によるアンテナコイルのインダクタンスやコンデンサの静電容量のずれ、すなわち、共振周波数のずれを補正することができる構造及び調整方法が望まれており、例えば、特開2000− [0007] Therefore, the deviation of the capacitance of the inductance and the capacitor of the antenna coil due to factors of production, that is, it is desired structure and adjusting method capable of correcting a deviation of the resonance frequency, for example, JP-2000 -
216494号公報では、基板の一方の面に形成するアンテナコイルは同一形状とし、他方に設ける電極は面積が徐々に減少するように導電性ペーストをスクリーン印刷し、これらの電極を組み合わせることによってコンデンサの静電容量を調整して最適な共振周波数を得ている。 The 216494 discloses, the antenna coil is formed on one surface of the substrate with the same shape, the electrode provided on the other of the conductive paste so that the area decreases gradually screen printing, the capacitor by combining these electrodes to obtain an optimum resonance frequency by adjusting the capacitance. 【0008】また、特開平10−84075号公報では、コンデンサを構成する一方の電極を多数のフィンガーが基部から延びる櫛型構造とし、櫛型電極のフィンガーを順次切断することにより、コンデンサの電極面積すなわち静電容量を変化させて、それにより共振周波数を調整する方法について記載している。 [0008] In the Japanese Patent 10-84075, JP-by multiple fingers of one electrode constituting the capacitor is a comb structure extending from the base, are sequentially cut the fingers of the comb electrodes, the electrode area of ​​the capacitor that by changing the capacitance, describes a method for thereby adjusting the resonance frequency. この特開平10− The JP-A-10-
84075号公報の調整方法について図面を参照して説明する。 Will be described with reference to the drawings a method of adjusting 84075 JP. 【0009】図9は上述した従来の共振回路のコンデンサ部の構造を模式的に示す図であり、(a)は平面図、 [0009] Figure 9 is a diagram showing a structure of a capacitor portion of a conventional resonant circuit described above schematically, (a) is a plan view,
(b)は(a)のB−B′線における断面図である。 (B) is a sectional view along the line B-B 'in (a). 図9に示すように、絶縁体からなる基板6を挟んで、一方の面に櫛型電極7((a)の実線)と幹部電極9とが、 As shown in FIG. 9, across the substrate 6 made of an insulating material, on one side a comb-shaped electrode 7 ((solid line a)) and the stem electrodes 9,
他方の面に対向電極8((a)の破線)が形成されている。 Other opposing the surface electrode 8 ((a dashed)) are formed. この櫛型電極7は、同一幅のフィンガー7bが基部7aに並設して形成され、一方、対向電極8は、基板6 The comb-shaped electrode 7, finger 7b of the same width are formed in parallel to the base 7a, On the other hand, the counter electrode 8, the substrate 6
の法線方向から見て矩形形状の電極がフィンガー7bと相重なるように形成されている。 Electrodes of rectangular shape as viewed from the normal direction is formed so as to overlap phase and the finger 7b of. 上記構造の櫛型電極7 Comb electrodes of the structure 7
及び対向電極8を用いて共振周波数を調整する方法について以下に示す。 And the following method for adjusting the resonance frequency by using a counter electrode 8. 【0010】まず、共振回路の共振周波数fは、コイルのインダクタンスLとシートコンデンサの静電容量Cとで決まり、次式で表される。 [0010] First, the resonance frequency f of the resonant circuit is determined by the capacitance C of the inductance L and the sheet capacitor coil is expressed by the following equation. 【0011】 [0011] 【0012】また、静電容量Cは対向する電極(図ではフィンガー7bと対向電極8)が重なる部分の面積に比例し、電極間の距離に反比例する。 [0012] (in the figure finger 7b and the counter electrode 8) electrode capacitance C is opposite proportional to the area of ​​the portion overlapping, inversely proportional to the distance between the electrodes. 従って、フィンガー7bの付け根のカット部7cをカットすることによって、コンデンサの電極面積を減らして静電容量Cを減少させ、式1より共振周波数fを増加させることができる。 Therefore, by cutting the base of the cutting portion 7c of the finger 7b, reducing the capacitance C reduces the electrode area of ​​the capacitor, it is possible to increase the resonance frequency f from Equation 1. そこで、フィンガー7bをカットする前のコンデンサの静電容量を予め大きめにしておき、フィンガー7b Therefore, leave in advance large electrostatic capacity before the capacitor for cutting finger 7b, fingers 7b
をカットすることによって共振周波数fを所望の値に調節することができる。 It is possible to adjust the resonant frequency f to a desired value by cutting a. 【0013】しかしながら、従来の電極の構造では、櫛型電極7のフィンガー7bの幅が一定であり、また、対向電極8が矩形形状であるため、各々のフィンガー7b [0013] However, in the structure of the conventional electrode, the width of the finger 7b of the comb electrode 7 is constant, and because the counter electrode 8 has a rectangular shape, each of the finger 7b
が形成する電極の面積、すなわち静電容量Cは同一となる。 There the area of ​​the electrode to be formed, that the electrostatic capacitance C becomes the same. 従って、フィンガー7bを順次切断した場合の共振周波数のシフト量は、式1の関係から一定とはならず、 Therefore, the shift amount of the resonance frequency in the case of successively cutting the finger 7b is not constant from the relationship of the formula 1,
カットするフィンガー7bの本数が多くなるほど式1の分母の変化量が大きくなるため、共振周波数のシフト量が大きくなってしまう。 Since the amount of change in the denominator of the more formula 1 number increases fingers 7b for cutting is increased, the amount of shift of the resonant frequency is increased. 【0014】このような構造では、共振周波数fを目標とする値に調節するためには、予め所望の共振周波数f [0014] In this structure, in order to adjust to the target value of the resonance frequency f in advance a desired resonant frequency f
に対応するコンデンサの静電容量Cを計算により求め、 Determined by calculation the capacitance C of the corresponding capacitor,
その静電容量になるようにカットするフィンガーの本数を求めるという2段階の手順を踏まなければならず、共振周波数の測定値から直接フィンガー7bのカット本数を容易に計算することができない。 Its must step on the two-step procedure of determining the number of fingers to be cut so that the electrostatic capacitance can not be easily calculated cut number of direct finger 7b from the measured values ​​of the resonance frequency. すなわち、実際の作業において、基板6上にコイルとコンデンサからなる共振回路を形成した後、検査装置を用いて共振周波数を測定しても、測定値から直接フィンガー7bのカット数が決定できないため、フィンガーをカットしては測定を行うという動作を何度も繰り返して共振周波数の調整を行う必要があった。 That is, since the actual work, after forming a resonant circuit composed of a coil and a capacitor on the substrate 6, also be measured resonance frequency using an inspection apparatus, which can not determine the number of cuts directly finger 7b from the measured values, and cut the finger there was a need to adjust the also repeated resonance frequency many times the operation of performing the measurements. 【0015】本発明は、上記問題点に鑑みてなされたものであって、その主たる目的は、RFID用タグのような共振回路を備える装置の共振周波数を簡単に調整することができるRFID用タグの電極構造及び該電極を用いた共振周波数の調整方法を提供することにある。 [0015] The present invention was made in view of the above problems, the main object, the RFID tag can be easily adjusted to the resonant frequency of the device comprising a resonant circuit, such as a RFID tag and to provide a method of adjusting the resonant frequency using the electrode structure and the electrode. 【0016】 【課題を解決するための手段】上記目的を達成するため、本発明のRFID用タグの電極構造は、RFID用タグの共振回路を構成するコンデンサの電極が、複数のフィンガーが基部に接続される櫛型電極及び幹部電極と、基板を挟んで反対側の面に形成される対向電極とからなり、前記櫛型電極の各々の前記フィンガーと前記対向電極との重なり部分の面積が、前記櫛型電極の前記基部の長手方向の一端側から他端側に向かって徐々に変化するように、前記電極の形状が設定されているものである。 [0016] To achieve the above object, resolving means for the Problems, the electrode structure of the RFID tag of the present invention, the capacitor electrodes constituting the resonant circuit of the RFID tag is, a plurality of fingers to the base a comb-shaped electrode and the stem electrodes connected, the area of ​​the overlapping portion of the consists of a counter electrode formed on the opposite sides of the substrate, with the fingers of each of the comb-shaped electrode and the counter electrode, so as to change gradually toward the other end from the one longitudinal end of the base portion of the comb-shaped electrode, the shape of the electrode is set. 【0017】本発明においては、前記重なり部分の面積が、前記フィンガーを前記櫛型電極の前記一端側から順に前記基部から切り離した場合において、前記共振回路の共振周波数のシフト量が略一定となるように、前記電極の形状が設定されることが好ましい。 In the present invention, the area of ​​the overlapping portion, in a case where the finger is disconnected from the base in this order from the one end side of the comb-shaped electrode, the amount of shift of the resonant frequency of the resonant circuit is substantially constant as such, it is preferable that the shape of the electrode is set. 【0018】また、本発明においては、前記櫛型電極の前記一端側から数えてn(nは正数)番目の前記フィンガーと前記対向電極とで形成される容量ΔCnが、C及びkを定数としたときにΔCn=C×(1−kn)で表される関係を満たすように、前記電極の形状が設定される構成とすることができる。 [0018] In the present invention, n counted from the one end side of the comb-shaped electrode (n is a positive number) capacity ΔCn formed between the counter electrode and the second of the fingers, constants C and k so as to satisfy the represented relationship ΔCn = C × (1-kn) when the can be configured to the shape of the electrode is set. 【0019】また、本発明においては、前記対向電極が、前記櫛型電極の前記他端側に向かって徐々に細くなるテーパー形状又は段階的に細くなる階段形状をなす構成とすることができ、前記対向電極の前記一端側の幅をW1、前記他端側の幅をW2としたとき、W1:W2= [0019] In the present invention, the counter electrode may be configured to form a progressively narrowing tapered or stepwise narrowing stepped shape toward the other end side of the comb-shaped electrode, wherein said one end of the width of the counter electrode W1, when the width of the other end was W2, W1: W2 =
(1−k):(1−kn)となることが好ましい。 (1-k) and made it is preferable :( 1-kn). 【0020】また、本発明においては、前記櫛型電極が、前記他端側に向かうに従って徐々に前記フィンガーの幅が小さくなるように形成されている構成とすることができ、前記櫛型電極の前記一端側の前記フィンガーの幅をWf1、前記他端側の幅をWf2としたとき、Wf [0020] In the present invention, the comb-shaped electrodes, the width gradually the finger toward the free other end can be configured to be formed to be smaller, the comb electrode one end of the width of the fingers of the side Wf1, when the Wf2 the width of the other end, Wf
1:Wf2=(1−k):(1−kn)となることが好ましい。 1: Wf2 = (1-k) and made it is preferable :( 1-kn). 【0021】また、本発明においては、前記基板が、P [0021] In the present invention, the substrate is, P
ETシート、ポリエチレンシート又はポリイミドシートのいずれか一からなり、前記電極がAl又はCuを材料とする導電膜のエッチングパターンからなる構成とすることができ、前記基板と前記電極の材料との組み合わせが、PETシートとAl又はCu、ポリエチレンシートとAl、ポリイミドシートとCuのいずれか一からなることが好ましい。 ET sheet, made from any one of a polyethylene sheet or polyimide sheet, the electrodes can be configured to consist of etched pattern of the conductive film to the material of Al or Cu, is combined with the material of the substrate and the electrode , PET sheet and Al or Cu, polyethylene sheet and Al, is preferably made of any one of the polyimide sheet and Cu. 【0022】また、本発明の共振周波数の調整方法は、 [0022] In addition, the method of adjusting the resonance frequency of the present invention,
上記電極構造を有するRFID用タグにおける共振周波数の調整方法であって、前記基板に前記共振回路を一旦形成した後、該共振回路の共振周波数を測定するステップと、測定した共振周波数と所望の周波数とのずれ量を求め、該ずれ量を前記フィンガー毎の共振周波数シフト量で割って、切断すべき前記フィンガーの本数を設定するステップと、前記フィンガーを設定された本数分だけ前記コンデンサより切断できるような前記基部の所定のカット部を1カ所切断して、共振周波数を前記所望の周波数に調整するステップと、を少なくとも有するものである。 A method of adjusting a resonance frequency in an RFID tag having the above electrode structure, after once forming the resonant circuit to the substrate, and measuring the resonant frequency of the resonant circuit, a desired frequency and the resonance frequency measured determine the deviation between, by dividing the amount of deviation at the resonance frequency shift amount of each of the fingers, and setting the number of the fingers to be cut, it can be cut from only the capacitor number fraction that is set to the finger the predetermined cut portion of the base portion, such as by cutting one place, and has the steps of adjusting the resonance frequency to the desired frequency, at least. 【0023】このように、本発明は、RFID用タグの共振回路のコンデンサを構成する対向電極を櫛型電極のフィンガーとの重なり部分の面積が変化するように階段状やテーパー状としたり、また、櫛型電極のフィンガー自体の幅を変化させ、かつ、対向電極の形状やフィンガーの幅を所定の関係式(ΔCn=C×(1−kn))を満たすように設定することにより、フィンガー毎の共振周波数のシフト量を略一定にすることができる。 [0023] Thus, the present invention is, or stepped or tapered so as counter electrodes constituting the capacitor of the resonant circuit of the RFID tag is an area of ​​overlap between the fingers of the comb electrodes changes, also , by changing the width of the finger itself of the comb electrode, and, by setting so as to satisfy the width of the shape and the finger of the counter electrode given relational expression (ΔCn = C × (1-kn)), each finger it can be the shift amount of the resonance frequency substantially constant. これにより、切断すべき前記フィンガーの本数を容易に計算できるため、前記基部の所定のカット部を1カ所だけ切断し、必要な本数分の前記フィンガーを前記コンデンサより切り離せ、共振周波数の調整を容易にすることが可能となる。 Accordingly, it is possible to easily calculate the number of the fingers to be cut, a predetermined cut portion of the base portion is cut only one point, inseparable from the condenser to the finger in the number fraction necessary, facilitate the adjustment of the resonant frequency it is possible to to. 【0024】 【発明の実施の形態】本発明に係るRFID用タグの電極構造は、その好ましい一実施の形態において、リーダ/ライタとのデータの交信を行うRFID用タグの共振回路を構成するコンデンサの櫛型電極と、基板を挟んで反対側の面に形成される対向電極とを、櫛型電極の各々のフィンガーと対向電極との重なり部分の面積が、櫛型電極の先端側から根元側に向かって徐々に小さくなるように形成し、フィンガーを順次切断していった場合の共振周波数のシフト量が略一定となるようにするものである。 The electrode structure of the RFID tag according to the present invention DETAILED DESCRIPTION OF THE INVENTION, the capacitor constituting the form of its one preferred, the resonant circuit of the RFID tag communicates data with the reader / writer a comb electrode and a counter electrode formed on the opposite side across the substrate, the area of ​​overlap between each of the finger and the counter electrode of the interdigital electrodes, root side from the front end side of the comb electrode in which it is formed so as to gradually become smaller, the shift in the resonance frequency when began to sequentially cut the finger is made to be substantially constant against. 【0025】すなわち、カットするフィンガーの位置に依らず、フィンガー1本当りの共振周波数のシフト量を一定にするために、フィンガー毎に対向電極との間で形成する微小容量値ΔCを設定する。 [0025] That is, regardless of the position of the fingers to be cut, in order to shift in the resonance frequency of one per finger constant, to set the minute capacitance value ΔC which forms between the opposite electrode for each finger. 設定例として、例えば、ΔCn=C×(1−kn)とすれば良い。 As configuration examples, for example, it may be set ΔCn = C × (1-kn). ここで、 here,
kは比例定数、ΔCnは櫛型電極の先端からn番目のフィンガーが対向電極と形成する微小容量、Cは定数である。 Minute capacitance k is a proportional constant, DerutaCn is the n-th finger from the tip of the comb electrodes are formed and a counter electrode, C is a constant. 但し、kの値は、C 0 (フィンガーカット前のタグの静電容量)とCの値をもとに、最適値に設定する必要があり、例えば、フィンガーの幅及びフィンガー同士の間隔は一定であり、交差する対向電極を根元が細いテーパー形状や階段形状とする、フィンガーの幅を櫛型電極の根元に近くなるほど細くなるようにすることにより実現できる。 However, the value of k, C 0 based on the value and C of (the capacitance of the finger-cut before the tag), must be set to an optimum value, for example, the spacing width and finger each other fingers constant , and the can be achieved by the opposing electrodes intersecting roots to a narrow tapered shape or stepped shape, the width of the fingers to be narrower as closer to the root of the comb electrodes. 【0026】 【実施例】上記した本発明の実施の形態についてさらに詳細に説明すべく、本発明の実施例について図面を参照して説明する。 [0026] EXAMPLES order to describe in detail the embodiment of the present invention described above will be described with reference to the accompanying drawings embodiments of the present invention. 【0027】[実施例1]まず、本発明の第1の実施例に係るRFID用タグの電極構造及び該電極を用いた共振周波数の調整方法について、図1乃至図6を参照して説明する。 [0027] [Example 1] First, the method of adjusting the resonant frequency using the electrode structures and the electrodes of the RFID tag according to a first embodiment of the present invention will be described with reference to FIGS . 図1は、RFIDシステムの全体構成を模式的に示す図である。 Figure 1 is a diagram schematically showing the overall configuration of an RFID system. また、図2は、本実施例のRFID Also, FIG. 2, RFID of this embodiment
用ラベルタグの構造の一例を示す図であり、図3は、共振回路のコンデンサ部分の拡大図である。 Is a diagram showing an example of the structure of use label tag, FIG. 3 is an enlarged view of a capacitor portion of the resonant circuit. また、図4及び図5は、本実施例の効果を説明するための図であり、 Further, FIGS. 4 and 5 are views for explaining the effect of this embodiment,
図6は対向電極の他の構造を示す図である。 6 is a diagram showing another structure of the counter electrode. 【0028】図1に示すように、RFIDシステム1 As shown in FIG. 1, RFID system 1
は、アンテナ3aを用いてデータの交信を行うリーダ/ It includes a reader which communicates data with an antenna 3a /
ライタ3と、ラベル型、コイン型、シート型等の種々の形状のタグ2とからなり、リーダ/ライタ3には、送受信信号を変換するための通信回路部3bと送受信信号をデコードするための演算処理部3cとが接続されている。 Writer 3, a label shape, a coin shape, made from the tag 2 which various shapes of sheet type, etc., to the reader / writer 3, for decoding the communication circuit unit 3b and the transmission and reception signals for converting a reception signal an arithmetic processing section 3c is connected. また、タグ2は、その内部にコイルとコンデンサとから構成される共振回路2aを備え、タグ2側でも信号を生成する場合には、共振回路2aにデータの演算、記憶を行うIC2bが接続され、内蔵する電源又はリーダ/ライタ3から供給される電源を用いて駆動される。 The tag 2 includes a resonant circuit 2a composed of a coil and a capacitor therein, when generating signals in the tag 2 side, the operation data, IC 2b which performs storage is connected to the resonant circuit 2a , it is driven using the power supplied from the power supply or the reader / writer 3 built. 【0029】このRFIDシステム1におけるリーダ/ The reader in the RFID system 1 /
ライタ3とタグ2とのデータ通信は、所望の通信周波数(例えば、13.56MHz)により行われるため、タグ2の共振回路2aの共振周波数を通信周波数に正確に調整する必要がある。 Data communication between the writer 3 and the tag 2, the desired communication frequency (e.g., 13.56 MHz) to be done by, it is necessary to adjust accurately the resonant frequency of the resonant circuit 2a of the tag 2 to the communication frequency. ここで、タグ2の構造について図2を参照して説明する。 Here, the structure of the tag 2 will be described with reference to FIG. 図2は、ラベル型タグの構造の一例を示す図であり、(a)は平面図、(b)は(a) Figure 2 is a diagram showing an example of the structure of a label tag, (a) is a plan view, (b) is (a)
のA−A′線における断面図である。 It is a cross-sectional view taken along line A-A '. 【0030】図2に示すように、一般に、ラベル型タグは基板6とその両面に形成した導電膜パターンとIC2 As shown in FIG. 2, generally, the label type tag and the conductive film pattern formed on both surfaces thereof with the substrate 6 IC 2
bとから構成され、フレキシブルな絶縁性シートからなる基板6の両面に設けられたAlやCu等の導電膜をエッチングにより除去したり、スクリーン印刷により導電性ペーストを塗布することにより、コイル4や櫛型電極7、対向電極8のパターンが形成されるが、このパターン形成におけるエッチングやスクリーン印刷の精度等の製造上の条件によりパターン形状に個体差が生じる。 Consists is b, or is removed by etching the conductive film such as Al or Cu which is provided on both sides of the substrate 6 made of a flexible insulating sheet, by applying a conductive paste by screen printing, the coil 4 Ya comb electrodes 7, but the pattern of the counter electrode 8 is formed, individual differences occur in the pattern shape by conditions on the manufacture of precision of etching or screen printing in the pattern formation. 【0031】そこで、パターン形成の個体差に起因するタグ2毎の共振周波数のずれを調整するために、共振回路2aを形成するコイル4のインダクタンスL又はコンデンサ5の静電容量Cをパターン形成後に調整する必要があるが、インダクタンスLはコイルの巻き数と面積に比例し、パターン形成後にこれらを調整することは困難である。 [0031] Therefore, in order to adjust the deviation of the resonant frequency of each tag 2 due to the individual difference of the pattern formed after patterning the capacitance C of the inductance L or a capacitor 5 of the coil 4 to form a resonant circuit 2a it is necessary to adjust the inductance L is proportional to the winding number and area of ​​the coil, it is difficult to adjust them after the pattern formation. 一方、コンデンサ5の静電容量Cは絶縁層(基板6)を挟んで形成される電極(櫛型電極7及び幹部電極9と対向電極8)の重なり部分の面積及び両電極間の距離に相関し、特に電極面積に関しては調整が容易である。 On the other hand, the electrostatic capacitance C of the capacitor 5 is correlated to the distance between the area and the electrodes of the overlapping portions of the electrodes formed to sandwich the insulating layer (substrate 6) (comb electrodes 7 and stem electrodes 9 and the counter electrode 8) and, it is easy to adjust particularly for electrode area. 【0032】そこで、従来例において示したように、一方の電極を基部7aに多数のフィンガー7bが並設される櫛型構造とし、このフィンガー7bを付け根のカット部7cで切断することによってコンデンサ5の電極の面積すなわち静電容量Cを小さくし、これにより、二次的に共振周波数fを調整している。 [0032] Therefore, the capacitor 5 by as shown in the conventional example, a comb structure which many fingers 7b one electrode to the base 7a is arranged to cut the finger 7b at the base of the cutting portion 7c to reduce the area i.e. the capacitance C of the electrode, thereby, it is adjusted secondary resonance frequency f. しかしながら、従来の電極構造では、対向電極8は矩形形状であり、また、櫛型電極7のフィンガー7bの幅は同一であるため、どのフィンガーを切断しても面積の減少量すなわち静電容量の変化量は一定であるため、式1の関係から共振周波数fのシフト量は一定とならず、その調整が困難であった。 However, in the conventional electrode structure, the counter electrode 8 has a rectangular shape, the width of the finger 7b of the comb electrodes 7 are the same, be cut any finger of decrease i.e. the capacitance of the area since the amount of change is constant, the amount of shift of the resonant frequency f from the relationship of equation 1 is not constant, the adjustment is difficult. 【0033】そこで、本実施例では、フィンガー7b毎に静電容量の変化量を一定にするのではなく、共振周波数そのものの変化量が略一定となるような電極形状を提案する。 [0033] Therefore, in this embodiment, rather than a constant amount of change in the capacitance per finger 7b, it proposes an electrode shaped like change in the resonance frequency itself is substantially constant. なお、以下に示す電極形状の設計方法は、本願発明者が経験的に得た新規な知見に基づくものであり、 Incidentally, the design method of the electrode shape shown below is based on the novel finding by the present inventor has obtained empirically,
RFIDシステム1に許容される共振周波数のずれ量や実際の共振周波数の調整作業を念頭において案出したものである。 The adjustment of the displacement amount and the actual resonant frequency of acceptable resonant frequency RFID system 1 is obtained devised in mind. 以下に具体的な設計方法について詳述する。 It will be described in detail specific design methods below. 【0034】図3は、本実施例の共振回路2aのコンデンサ5を構成する櫛型電極7と対向電極8の構造及び位置関係を模式的に示す図であり、櫛型電極7は基部7a [0034] FIG. 3 is a diagram schematically showing the structure and positional relationship of the comb electrode 7 and the counter electrode 8 constituting the capacitor 5 of the resonance circuit 2a of the present embodiment, the comb-shaped electrode 7 base 7a
の片側にn本(nは任意の整数)のフィンガー7bが平行かつ等間隔に配設されて構成されており、基板6を挟んで反対側には、点線で示すテーパー状の対向電極8a (N is an arbitrary integer) n present on one side of which is configured to be disposed in the finger 7b is parallel and equidistant, on the opposite side across the substrate 6, tapered counter electrode 8a shown by a dotted line
が先端側(図の右側)で太く、根元側(図の左側)で細くなるように形成されている。 There thick at the tip end side (right side in the figure), are formed to be thinner at the root side (the left side in the figure). なお、ここでは、フィンガー7bは等間隔かつ平行に配設されているが、各々のフィンガー7bと対向電極8との重なり部分の面積が後述する関係を満たす限りにおいて、図の形状に限定されない。 Here, the finger 7b is are arranged equidistantly and in parallel, as long as satisfying the relation area of ​​overlap between each of the finger 7b and the counter electrode 8 to be described later, is not limited to the shape of FIG. 【0035】まず、フィンガー1本あたりの共振周波数のシフト量を略一定にするための関係式を定めるが、本願発明者は様々な関係式を検討した結果、RFIDシステム1における共振周波数のずれの許容値や電極形成の容易性等を勘案して、コンデンサ5の静電容量の変化量ΔCnを式2の関係式とすると、共振周波数のシフト量の変化が抑制されることを見出した。 [0035] First, define the relation to the amount of shift of the resonant frequency per one finger substantially constant, the present inventors have results of studying various relations, the shift of the resonance frequency in the RFID system 1 in consideration of the tolerance and ease of the electrode forming, when the variation ΔCn the capacitance of the capacitor 5 and the relation formula 2 has been found that changes in the shift amount of the resonance frequency is suppressed. 以下、式2の比例定数kを求める方法について説明する。 The following describes how to determine the proportional constant k of Equation 2. 【0036】 [0036] 【0037】ΔCnを式2で表した場合の1本目とn本目のフィンガーカット時の共振周波数のシフト量Δfが等しくなるようなkを求める。 [0037] ΔCn the seek k as the shift amount Δf is equal to the resonance frequency during one eyes n-th finger cut when expressed in Equation 2. まず、1本面のフィンガーをカットした場合のΔf は、カット前の静電容量をC とすると、カット後の静電容量がC −C(1− First, Delta] f 1 in the case of cutting a single plane fingers, when the electrostatic capacity before cutting the C 0, the capacitance after cut C 0 -C (1-
k)であることから、次式で表される。 Since it is k), it is expressed by the following equation. 【0038】 [0038] 【0039】同様にn本目のフィンガーをカットした場合のΔf は、1からn−1本目をカットしたときの容量の減少量が式4、1からn本目までをカットしたときの容量の減少量が式5となることから、式6で表される。 [0039] Similarly Delta] f n in the case of cutting the n-th finger, decrease the amount of decrease in capacity when the cut n-1 -th from 1 capacity when the cut from the equation 4,1 to n-th since the amount is formula 5, formula 6. 【0040】 [0040] 【0041】ここで、Δf とΔf とが等しいとすると、kはC、C 、nを用いて次式で表される。 [0041] Here, if the is equal to Delta] f 1 and Delta] f n, k is C, expressed by the following equation, using the C 0, n. 【0042】 [0042] 【0043】すなわち、櫛型電極のフィンガーの本数が与えられた時、初期静電容量C と定数Cを設定することにより、式7を用いてkを求めることができ、このk [0043] That is, when the number of the comb electrodes fingers is given, by setting the initial capacitance C 0 and constants C, it is possible to obtain the k using Equation 7, the k
を式2に当てはめて対向電極の形状を設定することにより、カットするフィンガーの本数によらず、共振周波数のシフト量を略一定にすることができる。 The by setting the shape of the counter electrode fit to equation 2, regardless of the number of fingers to be cut, it is possible to shift in the resonance frequency substantially constant. これにより、 As a result,
従来のように共振周波数のずれ量を一旦静電容量に変換し、その後カットするフィンガーの本数を設定するといった2段階の作業を行う必要がなくなり、共振周波数のずれ量から直接的にカットするフィンガーの本数を決定することができ、共振周波数の調整作業を格段に容易にすることができる。 Converted once capacitance deviation in the resonance frequency as in the prior art, then there is no need to perform a two-step operation such to set the number of fingers to be cut, directly cut from the deviation in the resonance frequency fingers You can determine the number of can be much easier operation of adjusting the resonance frequency. 【0044】以下、具体的に計算した結果を示す。 [0044] below, shows the results of specifically calculated. 例えば、カット前の静電容量C =100(pF)、定数C For example, before cutting of the electrostatic capacitance C 0 = 100 (pF), the constant C
=1、フィンガーの本数n=20を式7に代入するとk = 1, if the number n = 20 of the finger into Equation 7 k
を求めることができ、kは実数かつ式2の括弧内が正数になることから、k=0.0124184となる。 Can be obtained, k from the parentheses of real and type 2 is positive, the k = .0124184. このkを用いてΔCn=1−kn≒1−n/80の関係を満たすように対向電極8の形状を定めれば、フィンガー毎の共振周波数のシフト量を略一定にすることができる。 Be determined the shape of the counter electrode 8 so as to satisfy the relation of ΔCn = 1-kn ≒ 1-n / 80 using this k, it is possible to shift in the resonance frequency of each finger substantially constant. 【0045】上記計算の妥当性を確認するために上記手法で得た解と任意に設定した値とを用いて共振周波数のシフト量のシミュレーションを行った。 The simulation was performed for the amount of shift of the resonant frequency by using the value set on the solution and optionally obtained in the above method in order to confirm the validity of the calculations. その結果を表1 Table 1 and the results
〜表3及び図4に示す。 Shown in to Table 3 and Figure 4. 表1〜表3は、n番目のフィンガーをカットした場合(すなわち、n−1番目までカットした状態から更にn番目のフィンガーをカットした時)の共振周波数のシフト量を示しており、表1はkの値を本実施例の方法で求めた値(k=0.012418 Tables 1-3, when cutting the n th finger (i.e., when the further cut n-th finger from a state of being cut to n-1 th) shows a shift in the resonance frequency of Table 1 values ​​of obtaining the value of k in the method of this embodiment (k = 0.012418
4)とした場合、表2はk=0.01に設定した場合、 4) and the case, if the table 2 is set to k = 0.01,
表3はk=0.015に設定した場合のシミュレーション結果を示している。 Table 3 shows the simulation results when set to k = 0.015. 【0046】表1〜表3をまとめた図4より、kを計算によらずに適当に設定した場合(図の△印又は□印)では、フィンガー7bのカット数が増えるほど共振周波数のシフト量が変化しているが、上記手法により算出した解を用いた場合(図の○印)の共振周波数のシフト量Δ [0046] Table from 1 to Table 3 to 4 summarizes, in case of a suitably set regardless of k to calculate (△ mark or symbol □ in the figure), the shift of the resonance frequency as the number of cuts of finger 7b is increased the amount is changing, the shift amount of the resonance frequency in the case of using the solutions calculated by the above method (○ mark in FIG.) delta
fは略一定であり、上記計算手法の妥当性を確認することができた。 f is substantially constant, it was possible to confirm the validity of the calculation method. 【0047】なお、表1及び図4の結果から、本実施例の方法で設定したkの値でも共振周波数のシフト量を完全に一定にすることができないが、その誤差((最大値−最小値)/平均値)は1%程度と小さく、RFIDシステムの使用形態を考慮すると問題ない数値であり、本実施例の方法で十分な精度で共振周波数の調整を行うことができる。 [0047] Incidentally, from the results of Table 1 and Figure 4, can not be completely constant shift in the resonance frequency in the value of k set by the method of this embodiment, the error ((maximum value - minimum value) / average value) is as small as about 1%, a numerical value no problem considering the usage of the RFID system, it is possible to adjust the resonance frequency with sufficient accuracy by the method of the present embodiment. 【0048】 【表1】k=0.0124184の場合 [0048] [Table 1] In the case of k = 0.0124184 【0049】 【表2】k=0.01の場合 [0049] [Table 2] In the case of k = 0.01 【0050】 【表3】k=0.015の場合 [0050] [Table 3] In the case of k = 0.015 【0051】次に、式2の関係式の妥当性を判断するために、フィンガー毎の静電容量の変化量ΔCnを一定の値にした場合と徐々に静電容量の変化量が小さくなる関係式を用いた場合について同様のシミュレーションを行った。 Next, in order to determine the validity of the relationship equation 2, the relationship in which the amount of change gradually capacitance and when the variation ΔCn the capacitance per finger to a certain value is reduced It was subjected to the same simulation for the case of using the equation. その結果を表4〜表6及び図5に示す。 The results are shown in Tables 4 to 6 and FIG. 5 a. 【0052】具体的には、櫛型電極7のフィンガー7b [0052] Specifically, finger 7b of the comb electrodes 7
をカットする前の静電容量C =100pFのラベルタグにおいて、定数Cを1、フィンガーの本数nを20本とし、櫛型電極7の先端からn番目のフィンガーが対向電極8と形成する微小容量がΔCn=1−n/80(p In the electrostatic capacitance C 0 = 100 pF label tag before cutting, 1 constant C, small capacity, the number n of fingers and twenty, n-th finger forms the counter electrode 8 from the tip of the comb-shaped electrode 7 There ΔCn = 1-n / 80 (p
F)となるように櫛型電極7を設計した。 A comb electrode 7 such that F) were designed. すなわち、フィンガーの幅及びフィンガー同士の間隔は一定であり、 That is, the interval of the width and the finger ends of fingers is constant,
交差する対向電極8の先端の幅(W1)と根元の幅(W The width of the tip of the counter electrode 8 which intersects (W1) and the root of the width (W
2)の比がW1:W2=1−1/80:1−20/80 The ratio of 2) is W1: W2 = 1-1 / 80: 1-20 / 80
=79:60のテーパー形状であるようなRFID用ラベルタグを作製した。 = 79: was prepared for RFID label tag such that 60 tapered. 櫛型電極7の先端から順に、フィンガー7bをカットしたときの共振周波数のシフト量を表4に示す。 In order from the distal end of the comb-shaped electrode 7, showing a shift in the resonance frequency when the cutting finger 7b in Table 4. 【0053】また、比較例として、全てのフィンガー7 [0053] In addition, as a comparative example, all of the finger 7
bに対してフィンガー7bと対向電極8とで形成する微小容量ΔCがΔC=1(pF)となるように対向電極8 b minute capacitance [Delta] C to form with the finger 7b and the counter electrode 8 with respect to the [Delta] C = 1 the counter so that (pF) electrode 8
を設計した場合(表5)と、櫛型電極7の先端からn番目のフィンガー7bと対向電極8とで形成する微小容量ΔC がΔC =0.99×C n−1 (pF)となる(但し、C =1)ように櫛型電極を設計した場合(表6)についても同様に計算した。 And if designed (Table 5), minute capacitance formed at the tip of the comb electrode 7 and the n-th finger 7b and the counter electrode 8 [Delta] C n is ΔC n = 0.99 × C n- 1 and (pF) becomes (however, C 1 = 1) was calculated in the same manner also when designed comb electrodes as (Table 6). 【0054】 【表4】ΔCn=1−n/80の場合 [0054] [Table 4] In the case of ΔCn = 1-n / 80 【0055】 【表5】ΔCn=1の場合 [0055] [Table 5] In the case of ΔCn = 1 【0056】 【表6】ΔCn=0.99×C n−1 (pF)の場合(但し、C =1) [0056] [Table 6] For ΔCn = 0.99 × C n-1 (pF) ( where, C 1 = 1) 【0057】上記表4〜表6の結果をグラフに表すと図5に示すようになる。 [0057] as shown in FIG. 5 is represented in the graph the results of the above Tables 4 to 6. 図5から、ΔCnが一定値の場合(図の□印)は、カットするフィンガー7bの本数が多くなるに従って静電容量の変化量は同じであるが、式1 From Figure 5, when ΔCn is constant value (figure □ mark) are capacitance variation with increasing many number of fingers 7b which cut is the same, the formula 1
の分母が徐々に小さくなるために共振周波数のシフト量は徐々に大きくなり、1本目と20本目とでは37%程度増加している。 The amount of shift of the resonant frequency to the denominator of the decreases gradually gradually increases, an increase of about 37 percent in the eyes twenty eyes one. また、静電容量の変化量を徐々に小さくした場合(図の△印)、共振周波数のシフト量のずれは緩和されるが、それでも1本目と20本目とでは10 Also, when gradually reduced capacitance variation (in FIG △ mark), the shift amount of the shift of the resonance frequency is relaxed, still with eyes twenty eyes one 10
%程度増加している。 Increase to have about%. 【0058】これに対して、本実施例の関係式で設計した場合(図の○印)では、共振周波数のシフト量は略一定であり、最小値(右端)と最大値(10本目)とのずれは1%強であり、本実施例の関係式が共振周波数のシフト量を一定にするために有効であることが分かる。 [0058] On the contrary, in the case of designing in relation to the present embodiment (○ mark in the figure), the shift amount of the resonance frequency is substantially constant, the minimum value (right end) Maximum value (tenth) deviation is over 1%, it can be seen equation of this embodiment is effective in order to fix the shift amount of the resonance frequency. これにより、共振回路形成後の検査において共振周波数にずれが生じている場合には、共振周波数のずれ量をフィンガー1本あたりの共振周波数の補正量(図4の場合は略0.065HMz)で割った数のフィンガー7bを切断することにより、簡単かつ確実に所望の共振周波数に調整することができる。 Thus, if a shift in the resonance frequency in the inspection after the resonant circuit formed has occurred, the correction amount of the resonant frequency per one finger the shift amount of the resonance frequency (approximately 0.065HMz in the case of FIG. 4) by cutting the divided number of fingers 7b, it can be adjusted to a desired resonant frequency easily and reliably. また、従来の共振周波数の調整方法では、フィンガー1本当たりの共振周波数の変化量が一定でないため、フィンガー7b根元のカット部7c Further, in the conventional method of adjusting the resonant frequency, since the change in the resonance frequency per one finger is not constant, the finger 7b root of the cut portion 7c
(図9参照)を順次切断して調整する必要があったが、 It was necessary to adjust sequentially cut (see FIG. 9),
本実施例の方法では、フィンガー1本当たりの共振周波数の変化量が一定であるため、切断すべきフィンガー7 In the method of the present embodiment, since the change in the resonance frequency per one finger is constant, the finger 7 to be cut
bの本数を容易に計算することができ、その結果、フィンガー7bの根元ではなく、基部7aのカット部7c The number of b can be easily calculated, so that, rather than the base of the finger 7b, the base 7a cuts 7c
(図3参照、図3ではフィンガー2本を切断する場合を例示)を直接切断することにより、一回の切断動作のみで所望の共振周波数に調整することができ、作業の効率化を図ることができる。 By (see FIG. 3, an exemplary case of cutting two fingers in FIG. 3) to cut the direct, it can be adjusted to a desired resonance frequency only single cutting operation, to improve the efficiency of the work can. 【0059】本実施例では、対向電極8の形状として、 [0059] In the present embodiment, the shape of the counter electrode 8,
図3に示すような先端に向かって徐々に太くなるテーパー形状としたが、図6(a)に示すように、先端に向かって階段状に太くなる形状とすることもできる。 Was gradually thicker a tapered shape toward the tip as shown in FIG. 3, as shown in FIG. 6 (a), may be a thicker becomes shaped stepwise toward the distal end. このような階段形状にすることによって、櫛型電極7と対向電極8との位置ずれ(特に、フィンガー7bに直交する方向の位置ずれ)が生じた場合であっても、フィンガー毎の重なり部分の面積の変化を抑えることができる。 With such a step shape, positional deviation between the comb electrode 7 and the counter electrode 8 (in particular, positional deviation in the direction perpendicular to the finger 7b) even if occurs, the overlapping portion of each finger it is possible to suppress the change in the area. どちらの形状とするかは、タグ2に求められる共振周波数の精度及び電極形成時の位置精度、製造容易性等を総合的に勘案して適宜選択することができる。 Or the one of the shape, positional accuracy at the time of precision and the electrode forming the resonant frequency required for the tag 2 can be appropriately selected comprehensively considering the manufacturability and the like. また、対向電極の形状は、上記テーパー状又は階段状に限定されず、フィンガー毎の静電容量の変化量ΔCnが式2の関係式で表される形状であれば良く、櫛型電極7の形状も、図6 The shape of the counter electrode is not limited to the tapered or stepped, variation ΔCn the capacitance per finger may have a shape expressed by the relational expression of Formula 2, the comb-shaped electrodes 7 shape, as shown in FIG. 6
(b)に示すように基部7aの両側にフィンガー7bが配置される構造であっても良い。 On both sides of the base portion 7a as shown in (b) it may have a structure in which the finger 7b is disposed. 【0060】なお、本実施例の方法を用いて設計した電極をタグに形成するには、例えば、基板6となる絶縁フィルムとして、例えばPETシートを用い、その両面に形成されたAl箔をエッチングにより除去することによってコイル4(上面コイル4a及び下面コイル4b)及びコンデンサ5(櫛型電極7及び幹部電極9並びに対向電極8)を形成し、その後、スルーホールにより上面コイル4aと下面コイル4bとを電気的に導通させてシートコイルを作製し、更にICチップ2bを実装してインレットを作製することにより可能である。 [0060] In order to form an electrode designed using the method of this embodiment the tag is, for example, as an insulating film serving as a substrate 6, for example, using a PET sheet, an Al foil formed on both sides thereof etching forming a coil 4 (top coil 4a and the lower surface coil 4b) and a capacitor 5 (comb electrodes 7 and stem electrodes 9 and the counter electrode 8) is removed by, then, the top coil 4a and the lower surface coil 4b via a through-hole to prepare a sheet coil electrically connected to cause a possible by making the inlet and further mounting the IC chip 2b. そして、検査装置を用いて共振周波数を測定し、上述した方法で所望の数のフィンガー7bをトリミングして共振周波数を調整し、インレットの両面にラベル加工してラベル型タグ2が完成する。 Then, by measuring the resonance frequency using an inspection device, to trim the desired number of fingers 7b in the manner described above to adjust the resonance frequency, the label type tag 2 is completed in the label processing on both sides of the inlet. 【0061】なお、絶縁フィルムとしてはPETシートに限定されず、ポリエチレンシートやポリイミドシートを用いることができ、導電膜としてはAlに代えてCu [0061] The invention is not limited to the PET sheet as an insulating film, may be used polyethylene sheet or polyimide sheet, as the conductive film instead of Al Cu
を用いることができる。 It can be used. この中で、PETシートとAl Among these, PET sheet and Al
又はCuとの組み合わせ、ポリエチレンシートとAlとの組み合わせ、又は、ポリイミドシートとCu箔との組み合わせが用途上好ましいことを確認している。 Or a combination of Cu, a combination of a polyethylene sheet and Al, or a combination of the polyimide sheet and the Cu foil is confirmed that the application preferable. 更に、 In addition,
共振回路形成後に実装するICはフリップチップ実装により行うことが用途上好ましい。 IC to implement after the resonant circuit formed is on applications preferably performed by flip chip mounting. 【0062】[実施例2]次に、本発明の第2の実施例に係るRFID用タグの櫛型電極構造及び該電極を用いた共振周波数の調整方法について、図7を参照して説明する。 [0062] [Embodiment 2] Next, a method for adjusting the resonance frequency using a comb-shaped electrode structures and the electrodes of the RFID tag according to a second embodiment of the present invention will be described with reference to FIG. 7 . 図7は、第2の実施例のRFID用ラベル型タグの共振回路を構成するコンデンサ部分の櫛型電極構造を示す図である。 Figure 7 is a diagram illustrating a comb electrode structure of the capacitor portion constituting the resonant circuit of the RFID label tag of the second embodiment. 【0063】前記した第1の実施例では、共振回路のコンデンサを構成する対向電極8の形状をテーパー状又は階段状にする方法について記載したが、逆に、櫛型電極7のフィンガー7bの形状を調整して共振周波数のシフト量を略一定にすることも可能である。 [0063] In the first embodiment described above has been described with regard to how the shape of the counter electrode 8 constituting the capacitor of the resonance circuit tapered or stepped, conversely, the shape of the finger 7b of the comb electrodes 7 it is also possible to adjust to be substantially constant shift in the resonance frequency. そこで、本実施例では、式2に基づいて静電容量すなわち電極の面積が変化するように各フィンガーの幅を先端に向かって徐々に広くなるように設定した。 Therefore, in this embodiment, it was set to be gradually wider toward the front end the width of each finger so as to change the area of ​​the capacitance or electrodes on the basis of equation 2. 【0064】具体的には、フィンガー7bをカットする前の静電容量C 0 =100pFのラベルタグにおいて、 [0064] Specifically, in the electrostatic capacitance C 0 = 100 pF label tag before cutting finger 7b,
櫛型電極7の先端からn番目のフィンガー7bが対向電極8と形成する微小容量ΔCnがΔCn=1−n/80 Minute capacitance DerutaCn the n-th finger 7b is formed the opposing electrode 8 from the tip of the comb-shaped electrode 7 ΔCn = 1-n / 80
(pF)となるように櫛型電極7を設計した。 Were designed comb electrode 7 such that (pF). すなわち、フィンガーと交差する対向電極8が矩形形状で、櫛型電極7の先端からn番目のフィンガーの幅Wfn=W That is, the counter electrode 8 is a rectangular shape that intersects the fingers, from the tip of the comb-shaped electrode 7 of the n-th finger width WFN = W
×(1−n/80)である櫛型電極7をもつRFI RFI with f 1 × interdigital electrode 7 is (1-n / 80)
D用ラベルタグを作製した。 To prepare a label tag for D. 但しフィンガーの本数は2 However, the number of fingers 2
0本あり、ΔC 1 =1−1/80(pF)である。 There 0 This is a ΔC 1 = 1-1 / 80 (pF ). 櫛型電極7の先端から順にフィンガー7bをカットしたときの共振周波数のシフト量をシミュレーションにより求めた。 The shift in the resonance frequency when the from the tip of the comb-shaped electrode 7 were cut finger 7b in the order given by simulation. 【0065】上記構造でもフィンガー毎の静電容量の変化量は第1の実施例の表4及び図5と同様になり、式2 [0065] a change of the capacitance of each finger in the structure becomes similar to Tables 4 and 5 in the first embodiment, Formula 2
の関係に基づいてフィンガー7bの幅を設定することにより、第1の実施例と同様に共振周波数のシフト量を略一定に保つことができ、実際の製造において共振周波数にずれが生じた場合の調整を容易に行うことができる。 Of by setting the width of the finger 7b based on the relationship, the shift amount of the first embodiment as well as the resonant frequency can be kept substantially constant, when the shift in the resonance frequency in actual production has occurred adjustment can be easily performed. 【0066】なお、第1の実施例で対向電極8の形状を設定し、第2の実施例で櫛型電極7の形状を設定したが、図8に示すように、これらを組み合わせた構造とすることもできる。 [0066] Incidentally, setting the shape of the counter electrode 8 in the first embodiment has been set the shape of the comb-shaped electrode 7 in the second embodiment, as shown in FIG. 8, and a combination of these structures it is also possible to. この場合は、対向電極8の幅と櫛型電極7のフィンガー7bの幅の積が式2の関係を満たすように各々の電極を形成すればよい。 In this case, the product of the width of the finger 7b width and comb electrodes 7 of the counter electrode 8 may be formed each electrode so as to satisfy the relationship of Formula 2. また、上記各実施例では、RFIDシステムに用いるタグの共振回路の構造について記載したが、本発明は上記実施例に限定されるものではなく、コンデンサの静電容量の調整が必要な任意の回路及び装置に適用することができる。 In the above-described embodiments have been described with regard to the structure of the resonant circuit of the tag used in the RFID system, the present invention is not limited to the above embodiment, the circuit adjusts any required capacitance of the capacitor and it can be applied to the device. 【0067】 【発明の効果】以上説明したように、本発明のRFID [0067] As described above, according to the present invention, RFID of the present invention
用タグの電極構造及び該電極を用いた共振周波数の調整方法によれば、下記記載の効果を奏する。 According to a method of adjusting the resonant frequency using the electrode structures and the electrodes of the use tags, the following effects described. 【0068】本発明の第1の効果は、カットするフィンガーの位置に依らず、フィンガー1本当りの共振周波数のシフト量をほぼ一定とすることができるということである。 [0068] The first effect of the present invention, regardless of the position of the fingers to be cut, is that the amount of shift of the resonant frequency of one per finger can be substantially constant. 【0069】その理由は、式2に基づいて、対向電極をテーパー状や階段状にしたり、また、櫛型電極の各フィンガーの幅を設定することにより、フィンガー毎の静電容量の変化量を調整しているからである。 [0069] The reason is based on equation 2, or the counter electrode in a tapered shape or stepped, also by setting the width of each finger of the comb electrodes, the amount of change in capacitance per finger This is because is adjusted. 【0070】また、本発明の第2の効果は、共振周波数を目標とする値へ調節するために必要なカット本数を容量に計算することができ、その結果、フィンガーの根元ではなく、基部のカット部を直接切断することにより、 [0070] The second effect of the present invention, it is possible to calculate the cut number required to adjust to the target value of the resonance frequency to the capacitor, so that, rather than the base of the fingers, the base of the by cutting the cut portion directly,
一回の切断動作のみで所望の共振周波数に調整することができ、作業の効率化を図ることができるということである。 Can be adjusted to a desired resonance frequency only by a single cutting operation, it is that it is possible to improve the efficiency of work. 【0071】その理由は、従来はフィンガー毎の面積が等しい、すなわち、静電容量の変化量が等しくなるように電極を形成していたため、目標とする共振周波数と測定した周波数のずれから一旦コンデンサの静電容量のずれを算出し、その結果からカットするフィンガーの本数を求めなければならなかったが、本発明では、フィンガー毎の共振周波数のシフト量が略等しくなるように対向電極の形状又は櫛型電極のフィンガーの幅が設定されているため、共振周波数のずれ量から直接カットするフィンガーの本数を求めることができるからである。 [0071] The reason is conventionally equal area of ​​each finger, i.e., since the capacitance variation is to form an electrode to be equal, once the deviation of the frequency and the measured resonance frequency a target capacitor and of calculating the deviation of the capacitance, but the results had to seek the number of fingers to be cut from the present invention, the counter electrode as the shift in the resonance frequency of each finger is substantially equal shape or the width of the fingers of the comb electrode is set, because it is possible to determine the number of fingers to be cut directly from the shift amount of the resonance frequency.

【図面の簡単な説明】 【図1】RFIDシステムの全体構成を模式的に示す図である。 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically showing the overall configuration of an RFID system. 【図2】本発明の第1の実施例に係るラベル型タグの構成を示す図であり、(a)は平面図、(b)は断面図である。 [Figure 2] is a diagram showing a configuration of a label tag according to a first embodiment of the present invention, (a) is a plan view, (b) is a cross-sectional view. 【図3】本発明の第1の実施例に係る櫛型電極の構成を示す平面図である。 3 is a plan view showing the configuration of a comb electrode according to the first embodiment of the present invention. 【図4】本発明の第1の実施例の効果を説明するための図であり、式2におけるkの値を変えた場合のフィンガー当たりの共振周波数シフト量の変化を示している。 It is a diagram for explaining the effects of the first embodiment of the present invention; FIGS shows a change of the resonance frequency shift amount per fingers when changing the value of k in Equation 2. 【図5】本発明の第1の実施例の効果を説明するための図であり、ΔCnの関係式を変えた場合のフィンガー当たりの共振周波数シフト量の変化を示している。 [Figure 5] is a diagram for explaining the effects of the first embodiment of the present invention shows a change in the resonance frequency shift amount per fingers when changing the relationship of DerutaCn. 【図6】本発明の第1の実施例に係るコンデンサの対向電極の他の構成を示す平面図である。 6 is a plan view showing another structure of the counter electrode of the capacitor according to the first embodiment of the present invention. 【図7】本発明の第2の実施例に係るコンデンサの櫛型電極の構成を示す平面図である。 7 is a plan view showing the configuration of a comb electrode of the capacitor according to the second embodiment of the present invention. 【図8】本発明の第2の実施例に係るコンデンサの櫛型電極の他の構成を示す平面図である。 8 is a plan view showing another structure of the comb electrodes of the capacitor according to a second embodiment of the present invention. 【図9】従来のコンデンサの櫛型電極構成を示す平面図である。 9 is a plan view illustrating a comb electrode structure of a conventional capacitor. 【符号の説明】 1 RFIDシステム2 タグ2a 共振回路2b IC 3 リーダ/ライタ3a アンテナ3b 通信回路部3c 演算処理部4 コイル4a 上面コイル4b 下面コイル5 コンデンサ6 基板7 櫛型電極7a 基部7b フィンガー7c カット部8 対向電極8a 対向電極(テーパー形状) 8b 対向電極(階段形状) 8c 対向電極(矩形形状) 9 幹部電極 [EXPLANATION OF SYMBOLS] 1 RFID system 2 tag 2a resonant circuit 2b IC 3 reader / writer 3a antenna 3b communication circuit section 3c processing unit 4 coils 4a top coil 4b lower surface coil 5 capacitors 6 substrate 7 comb electrodes 7a base 7b finger 7c cut portion 8 opposing electrode 8a counter electrode (tapered) 8b counter electrode (stepped shape) 8c counter electrode (rectangular) 9 executive electrode

───────────────────────────────────────────────────── フロントページの続き (72)発明者 石山 宏一 東京都文京区小石川1−12−14 三菱マテ リアル株式会社RFID事業センター内Fターム(参考) 5B035 BA01 BA03 BB09 CA11 CA23 5B058 CA15 ────────────────────────────────────────────────── ─── front page of the continuation (72) inventor Koichi Ishiyama, Bunkyo-ku, Tokyo Koishikawa 1-12-14 Mitsubishi mate real Co., Ltd. RFID business center in the F-term (reference) 5B035 BA01 BA03 BB09 CA11 CA23 5B058 CA15

Claims (1)

  1. 【特許請求の範囲】 【請求項1】RFID用タグの共振回路を構成するコンデンサの電極が、複数のフィンガーが基部に接続される櫛型電極及び幹部電極と、基板を挟んで反対側の面に形成される対向電極とからなり、 前記櫛型電極の各々の前記フィンガーと前記対向電極との重なり部分の面積が、前記櫛型電極の前記基部の長手方向の一端側から他端側に向かって徐々に変化するように、前記電極の形状が設定されていることを特徴とするRFID用タグの電極構造。 Claims We claim: 1. A capacitor constituting a resonant circuit of the RFID tag electrode, the comb-shaped electrode and the stem electrodes plurality of fingers is connected to the base, the opposite surface across the substrate It consists of a counter electrode formed on an area of ​​overlap between the finger and the counter electrode of each of the comb-shaped electrode, toward the other side from the one longitudinal end of the base portion of the comb-shaped electrode gradually changing manner, the electrode structure of the RFID tag, wherein the shape of the electrode is set Te. 【請求項2】前記重なり部分の面積が、前記フィンガーを前記櫛型電極の前記一端側から順に前記基部から切り離した場合において、前記共振回路の共振周波数のシフト量が略一定となるように、前記電極の形状が設定されることを特徴とする請求項1記載のRFID用タグの電極構造。 Area wherein said overlapping portion is, in a case where the finger is disconnected from the base in this order from the one end side of the comb-shaped electrodes, as a shift in the resonance frequency of the resonant circuit is substantially constant, electrode structure of the RFID tag according to claim 1, wherein the shape of the electrode is set. 【請求項3】前記櫛型電極の前記一端側から数えてn 3. A counted from the one end side of the comb-shaped electrode n
    (nは正数)番目の前記フィンガーと前記対向電極とで形成される容量ΔCnが、C及びkを定数としたときにΔCn=C×(1−kn)で表される関係を満たすように、前記電極の形状が設定されることを特徴とする請求項1又は2に記載のRFID用タグの電極構造。 As (n is a positive number) capacity DerutaCn formed between the counter electrode and the second of the fingers satisfies the relationship represented by ΔCn = C × (1-kn) when the constants C and k the electrode structure of the RFID tag according to claim 1 or 2, characterized in that the shape of the electrode is set. 【請求項4】前記対向電極が、前記櫛型電極の前記他端側に向かって徐々に細くなるテーパー形状又は段階的に細くなる階段形状をなすことを特徴とする請求項1乃至3のいずれか一に記載のRFID用タグの電極構造。 Wherein said counter electrode is any of claims 1 to 3, wherein the forming the progressively narrowing tapered or stepwise narrowing stepped shape toward the other end side of the comb-shaped electrode electrode structure of the RFID tag according to one or. 【請求項5】幅と間隔とが一定の前記フィンガーがn本あり、前記対向電極の前記一端側の幅をW1、前記他端側の幅をW2としたとき、W1:W2=(1−k): Wherein the width and the finger and is constant spacing there present n, the width of the one end side of the counter electrode W1, when the width of the other end was W2, W1: W2 = (1- k):
    (1−kn)となることを特徴とする請求項4記載のR R of (1-kn) become possible, characterized in claim 4, wherein
    FID用タグの電極構造。 Electrode structure of the tag FID. 【請求項6】前記櫛型電極が、前記他端側に向かうに従って徐々に前記フィンガーの幅が小さくなるように形成されていることを特徴とする請求項1乃至3のいずれか一に記載のRFID用タグの電極構造。 Wherein said interdigital transducer, according that it is formed gradually so that the width of the fingers is reduced in any one of claims 1 to 3, characterized in toward the free end side electrode structure of the tag RFID. 【請求項7】前記フィンガーがn本ある前記櫛型電極の前記一端側の前記フィンガーの幅をWf1、前記他端側の幅をWf2としたとき、Wf1:Wf2=(1− 7. The width of the fingers of the one end side of the comb-shaped electrode and the finger is in the n Wf1, when the Wf2 the width of the other end, Wf1: Wf2 = (1-
    k):(1−kn)となることを特徴とする請求項6記載のRFID用タグの電極構造。 k) :( 1-kn) and the electrode structure of the RFID tag according to claim 6, characterized in that. 【請求項8】前記基板が、PETシート、ポリエチレンシート又はポリイミドシートのいずれか一からなり、前記電極がAl又はCuを材料とする導電膜のエッチングパターンからなることを特徴とする請求項1乃至7のいずれか一に記載のRFID用タグの電極構造。 Wherein said substrate, PET sheet, made from any one of a polyethylene sheet or polyimide sheet, 1 to claim wherein the electrode is characterized by comprising the etched pattern of the conductive film to the material of Al or Cu electrode structure of the RFID tag according to any one of the 7. 【請求項9】前記基板と前記電極の材料との組み合わせが、PETシートとAl又はCu、ポリエチレンシートとAl、ポリイミドシートとCuのいずれか一からなることを特徴とする請求項8記載のRFID用タグの電極構造。 Combination of claim 9 of the substrate and the electrode material, PET sheet and Al or Cu, polyethylene sheet and Al, RFID according to claim 8, characterized in that it consists of any one of the polyimide sheet and Cu electrode structure of the use tags. 【請求項10】前記基板に、ICがフリップチップ実装されていることを特徴とする請求項1乃至9のいずれか一に記載のRFID用タグの電極構造。 10. the substrate, the electrode structure of the RFID tag according to any one of claims 1 to 9 IC is characterized in that is flip-chip mounted. 【請求項11】請求項1乃至10のいずれか一に記載の電極構造を有するRFID用タグにおける共振周波数の調整方法であって、 前記基板に前記共振回路を一旦形成した後、該共振回路の共振周波数を測定するステップと、測定した共振周波数と所望の周波数とのずれ量を求め、該ずれ量を前記フィンガー毎の共振周波数シフト量で割って、切断すべき前記フィンガーの本数を設定するステップと、前記フィンガーを設定された本数分だけ前記コンデンサより切断できるような前記基部の所定のカット部を1カ所切断して、共振周波数を前記所望の周波数に調整するステップと、を少なくとも有することを特徴とするRFID用タグの共振周波数の調整方法。 11. A method of adjusting a resonance frequency in an RFID tag having an electrode structure according to any one of claims 1 to 10, after once forming the resonant circuit to the substrate, of the resonant circuit determined measuring the resonant frequency, the amount of deviation of the measured resonance frequency and a desired frequency, by dividing the amount of deviation at the resonance frequency shift amount of each of the fingers, setting the number of the fingers to be cut step When, said predetermined cut portion of the base portion, such as finger can be cut from the capacitor by the number fraction is set to cut one location, and adjusting the resonance frequency to the desired frequency, to have at least a method of adjusting the resonant frequency of the RFID tag according to claim.
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