JP2006039947A - Composite magnetic sheet - Google Patents

Composite magnetic sheet Download PDF

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JP2006039947A
JP2006039947A JP2004218892A JP2004218892A JP2006039947A JP 2006039947 A JP2006039947 A JP 2006039947A JP 2004218892 A JP2004218892 A JP 2004218892A JP 2004218892 A JP2004218892 A JP 2004218892A JP 2006039947 A JP2006039947 A JP 2006039947A
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magnetic sheet
composite magnetic
mu
composite
powder
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Haruo Koyama
Shinichiro Yahagi
治雄 小山
慎一郎 矢萩
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Daido Steel Co Ltd
大同特殊鋼株式会社
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<P>PROBLEM TO BE SOLVED: To provide a composite magnetic sheet which secures high transmission and reception characteristics in frequency bands 1 to 20 MHz, is easy to treat, and is less expensive. <P>SOLUTION: The composite magnetic sheet 10 is formed by mixing a bonding agent with soft magnetic powers in a flat shape and has specified plasticity. The composite magnetic sheet 10 has a real number part μ' of complex permeability equal to or over 30 and an imaginary number part μ" equal to or below 10 in 1-20 MHz. Q value to be a ratio between the real number part μ' and the imaginary number part μ" of the composite magnetic sheet 10 is equal to 5 or larger. An aspect ratio of the soft magnetic powers in the flat shape ranges from 10 to 80. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、扁平状の軟磁性粉末と結合剤とを配合して成形した柔軟性を有する複合磁性シートに関するものである。 This invention relates to a composite magnetic sheet having flexibility molded by blending the flat soft magnetic powder and a binder.

ICメモリおよび通信回路で構成された微小チップと小型アンテナを内蔵したRFタグや非接触ICカード等のデータキャリアと、データを読み書きするリーダライタとの間のデータ交換を非接触(電磁波を用いた無線通信)で行なうRFID(Radio Frcqucncy Identification:電磁波を使った非接触の自動認識技術)において、1〜20MHzの周波数帯域、特に13.56MHz帯を用いた精算システムやプリペイドシステム等が知られている(例えば、特許文献1参照)。 And the data carrier, such as RF tags or non-contact type IC card which includes a micro chip and a small antenna configured by an IC memory and a communication circuit, using a non-contact (electromagnetic data exchange between the reader-writer for reading and writing data performed by wireless communication) RFID (radio Frcqucncy Identification: the non-contact automatic identification technology) using electromagnetic waves, the frequency band of 1~20MHz, especially such settlement systems and prepaid systems using 13.56MHz band is known (e.g., see Patent Document 1).

前記RFIDにおいて、データキャリアとリーダライタとの間の電磁波の通信距離を長くするために、例えばリーダライタに設けられたアンテナの裏面に、電磁波の送受特性を向上するために透磁率の高い磁性体を配設することが実施されている。 In the RFID, in order to increase the electromagnetic wave communication distance between the data carrier and the reader-writer, for example, on the back surface of the antenna provided in the reader-writer, a high magnetic permeability in order to improve the transmission and reception characteristics of an electromagnetic wave It has been implemented to be disposed. この磁性体としては、複素透磁率の実数部μ'が高く、かつ虚数部(損傷分)μ''が小さいことが好ましく、フェライト粉を焼結したものが適用されている。 As the magnetic material, the real part of the complex permeability mu 'is high and the imaginary part (injury min) mu' is preferably 'is small, those obtained by sintering ferrite powder is applied.
特開2003−224677号公報 JP 2003-224677 JP

しかし、フェライト粉を焼結した磁性体では、薄い板状にするのに手間が掛かると共に、異形状にするのが難しいため、コストが嵩むと共に使用できる部位が限定される難点が指摘される。 However, in the magnetic body by sintering ferrite powder, together with labor for the thin plate is applied, since it is difficult to different shapes, difficulties site that can be used with costly is limited is pointed out. また、焼結体であるために柔軟性がなく、装置への組付け時や落としたときに割れてしまうおそれがあり、取扱いに注意が必要であった。 Further, there is no flexibility for a sintered body, there is a fear that cracks when dropped assembling time and to the device, careful handling is required. 特に、13.56MHz帯で使用されるデータキャリアとしては薄型化の要求のあるカード型が主流であり、このカードに柔軟性のない磁性体を用いる場合には充分な強度を確保しなければならず、更にコストが嵩む問題を招く。 Shall in particular, as a data carrier used in the 13.56MHz band is mainstream card with thinning requirements, necessary to secure a sufficient strength in the case of this card using inflexible magnetic not lead to problems increase further cost.

すなわちこの発明は、従来の技術に係る前記課題に鑑み、これを好適に解決するべく提案されたものであって、1〜20MHzの周波数帯域において高い送受特性を確保し、取扱いが容易でかつ低コストで製造し得る複合磁性シートを提供することを目的とする。 That the present invention, in view of the above problems of the prior art, which has been proposed to suitably solve this, ensuring high transmission and reception characteristics in a frequency band 1~20MHz, is easy and low handling and to provide a composite magnetic sheet which can be manufactured at a cost.

前記課題を克服し、所期の目的を好適に達成するため、本発明に係る複合磁性シートは、 Order to overcome the above problems, suitably achieve the expected object, a composite magnetic sheet according to the present invention,
非接触のデータキャリアとリーダライタとの間で電磁波によるデータの送受を行なう自動認識装置において、前記データキャリアおよびリーダライタの両方あるいは何れか一方におけるアンテナの裏面に配設される複合磁性シートであって、 In the automatic recognition system for transmitting and receiving data by electromagnetic waves with the non-contact data carrier and the reader-writer, the disposed on the rear surface of the antenna in one both or one of the data carrier and the reader-writer a composite magnetic sheet Te,
前記複合磁性シートは、扁平状の軟磁性粉末と結合剤とを配合して成形された柔軟性を有するシートであり、 The composite magnetic sheet is a sheet having flexibility which is formed by blending the flat soft magnetic powder and a binder,
1〜20MHzにおける複素透磁率の実数部μ'が30以上で、虚数部μ''が10以下であることを特徴とする。 'In more than 30, the imaginary part mu' real part of the complex permeability mu at 1~20MHz 'is equal to or is 10 or less.

本発明に係る複合磁性シートによれば、1〜20MHzの周波数帯域において高い送受特性を確保することができる。 According to the composite magnetic sheet according to the present invention, it is possible to secure high transmission and reception characteristics in a frequency band 1~20MHz. またシートは柔軟性を有しているから、装置への組付け時や取扱い時に割れるのを防止することができる。 The sheets because they have flexibility, it is possible to prevent the cracking at the time and handling assembly of the device. 更に、薄型化が容易で、かつ各種形状にも簡単に成形することができるから、配設部位が限定されず、低コストで提供し得る。 Furthermore, it is easy to thin, and because it can be easily molded to various shapes, not limited in disposed position of can provide at a low cost.

軟磁性粉末の合金成分としてFe−Si−Al系のもの用いることで、複素透磁率の実数部μ'を高くすることができる。 By using those Fe-Si-Al-based as an alloying element of the soft magnetic powder, it is possible to increase the real part of the complex magnetic permeability mu '. また、軟磁性粉末のアスペクト比を10〜80の範囲とすることで、複素透磁率の虚数部μ''を小さくすることができる。 Further, the aspect ratio of the soft magnetic powder in a range of from 10 to 80, it is possible to reduce the imaginary part of the complex permeability mu ''.

次に、本発明に係る複合磁性シートにつき、好適な実施例を挙げて、添付図面を参照しながら以下説明する。 Next, a composite magnetic sheet according to the present invention, by way of preferred embodiments will be described below with reference to the accompanying drawings.

図1は、実施例に係る複合磁性シート10を、ICメモリおよび通信回路で構成された微小チップ(図示せず)と小型アンテナ12を内蔵したデータキャリアとしてのカード型のRFタグ14に配設したものを示すものであって、該複合磁性シート10は、扁平状の軟磁性粉末と結合剤とを所要の割合で配合して柔軟性を有するシート状に成形したものである。 Figure 1 is arranged a composite magnetic sheet 10 according to the embodiment, the RF tag 14 of the card type as IC memory and configured by a communication circuit microscale chip (not shown) and a data carrier with a built-in small antenna 12 there is shown the what, the composite magnetic sheet 10 is obtained by molding into a sheet having flexibility by blending a flat soft magnetic powder and a binder in the required proportions. すなわち、複合磁性シート10は柔軟性を有しているから、それ単体を取扱う際やRFタグ14に取付けて持運ぶ際に、落としたり変形させることで割れることはなく、取扱いが容易である。 That is, the composite magnetic sheet 10 because they have a flexibility, when carrying attached to or RF tag 14 when handling it alone never broken by deforming or dropped, it is easy to handle. また薄型化が容易で、かつ異形状等にも簡単に成形し得るから、製造コストを低廉に抑えることができると共に、取付け部位が限定されることもない。 The easy thin, and since may easily molded in different shapes such as, it is possible to suppress the inexpensive production costs, nor attachment site is limited. なお、データキャリアは、RFタグに限定されるものでなく、非接触ICカードを含む。 The data carrier is not limited to RF tags, comprises a non-contact IC card.

前記軟磁性粉末としては、複素透磁率の実数部μ'の値が高く、虚数部μ''の値が低い材料、例えば合金成分がFe−Si−Al系のものが好適に使用される。 As the soft magnetic powder, 'high value of the imaginary part mu' real part mu of complex magnetic permeability value is low material ', for example, the alloy components are those Fe-Si-Al system it is suitably used. すなわち、Fe−Si−Al系の合金成分を用いることで、1〜20MHzの周波数帯域において複素透磁率の実数部μ'を高くすることができる。 That is, by using the Fe-Si-Al alloy components, it is possible to increase the real part of the complex magnetic permeability mu 'in a frequency band 1~20MHz. また軟磁性粉末は、例えば急冷凝固法によって製造された磁性素材を所要寸法まで粉砕することで得られた扁平状(鱗片状)のものや、ガスアトマイズ法等により得られた球状のものをアトライタにより扁平状としたものが使用される。 The soft magnetic powder, for example, or anything rapid solidification by the manufactured magnetic material required dimensions to be obtained in flat for grinding (flakes), the attritor and a spherical obtained by a gas atomizing method or the like those with flat is used. なお、軟磁性粉末の配合割合は、求められる複素透磁率および柔軟性に応じて、30〜60体積%の範囲で適宜に設定される。 The mixing ratio of the soft magnetic powder, depending on the complex permeability and flexibility sought is set appropriately in the range of 30 to 60 vol%.

前記軟磁性粉末のアスペクト比、すなわち扁平状を呈する粒子の長軸L 1と短軸L 2との平均(粒径の平均)を厚みHで割った値〔{(L 1 +L 2 )/2}/H〕は、1〜20MHzの周波数帯域で複素透磁率の虚数部μ''を低く抑えるために、10〜80の範囲とするのが好適であり、より好ましくは20〜30である。 The aspect ratio of the soft magnetic powder, i.e. the average of the major axis L 1 and the minor axis L 2 particles exhibiting a flat value obtained by dividing the (average particle size) in thickness H [{(L 1 + L 2) / 2 } / H], in order to reduce the imaginary part of the complex permeability mu '' in a frequency band of 1~20MHz, is suitable in the range of 10 to 80, more preferably from 20 to 30. そして、複素透磁率の虚数部μ''を小さくすることで、実数部μ'と虚数部μ''との比{(μ')/(μ'')}である性能係数としてのQ値を、1〜20MHzの領域で5以上とすることができる。 Then, 'by reducing the real part mu' complex magnetic imaginary part of the permeability mu '' ratio of {(mu 'and imaginary part μ') / (μ '')} is the Q value as a coefficient of performance and it may be 5 or more in the region of 1~20MHz. これにより、RFタグ14における電磁波の送受特性が向上し、該RFタグ14との間でデータの送受が行なわれるリーダライタ16(図2参照)に対する通信距離を長くすることができる。 This improves the electromagnetic wave transmission and reception characteristics of the RF tag 14, it is possible to lengthen the communication distance with respect to the reader-writer 16 which transmission and reception of data is performed between the said RF tag 14 (see FIG. 2).

また結合剤としては、ポリマーまたはエラストマー等の有機結合剤が使用される。 As the binder, an organic binder, such as polymer or elastomer is used. 有機結合剤としては、例えば塩素化ポリエチレンやアクリル系の結合剤が好適に使用されるが、ゴム等であってもよく、複合磁性シート10に所要の柔軟性を付与し得るものであればよい。 The organic binder, for example, chlorinated polyethylene and acrylic binders are preferably used, it may be rubber or the like, as long as it can impart the required flexibility to the composite magnetic sheet 10 .

なお、図示例では自動認識装置におけるRFタグ14に複合磁性シート10を取付けた場合で説明したが、該RFタグ14との間でデータの送受が行なわれるリーダライタ16に、これに設けたアンテナの裏側となる位置に複合磁性シート10を取付けるものであってもよい。 Although described in the case of attaching the composite magnetic sheet 10 to the RF tag 14 in the automatic recognition apparatus in the illustrated example, the reader-writer 16 which transmission and reception of data is performed between the said RF tag 14, provided to the antenna in the backside position or it may be attached to the composite magnetic sheet 10. 更には、RFタグ14とリーダライタ16との両方に複合磁性シート10を夫々取付けてもよい。 Furthermore, the composite magnetic sheet 10 both in the RF tag 14 and the reader-writer 16 may be mounted respectively.

〔実験例〕 [Experimental Example]
ガスアトマイズ法により製造したFe−Si−Alのガス噴霧粉を25kgと、塩素化ポリエチレンを28.8リットルとを混合して、ボール(鋼球)250kgと共にアトライタに入れて所定時間だけ回転することで粉末の扁平化処理を行なった。 And 25kg gas atomized powder Fe-Si-Al was prepared by a gas atomizing method, a chlorinated polyethylene mixing 28.8 liters ball placed in the attritor along with the (steel balls) 250 kg by rotating a predetermined time It was carried out flattening processing of the powder. このアトライタでの処理時間を変更することによって、得られる扁平状粉末のアスペクト比を変えて、該アスペクト比が8と107の比較材および10〜79の発明材を夫々製造した。 By changing the processing time in this attritor, by changing the aspect ratio of the flat powder obtained, and the inventive materials of comparative material and 10 to 79 of the aspect ratio of 8 and 107 respectively prepared. なお、扁平状粉末の厚み測定については、粉末を樹脂に埋込み、これを研磨して、その研磨表面に露出した粉末を光学顕微鏡で観察して測定した。 Note that the thickness measurement of flat powder, embedding powder in a resin, and polished which was measured by observing the powder exposed on the polished surface with an optical microscope. また粒径測定については、扁平状粉末を走査電子顕微鏡で観察し、平均的な粒径(長軸L 1と短軸L 2 )を測定した。 For particle size measurement is also a flat powder was observed with a scanning electron microscope to measure the average particle size (long axis L 1 and the short axis L 2).

得られた比較材および発明材の各複合材料について、非酸化雰囲気において、800℃×2時間の焼鈍を行なった後、ニーダ混練−分出圧延−カレンダー圧延を経て、厚みが約1mmのシート状とした。 The obtained each composite material of Comparative material and the invention material has, in a non-oxidizing atmosphere, after performing the annealing of 800 ° C. × 2 hours, a kneader and kneaded - dispensing rolling - through calendaring, the thickness is about 1mm sheet and the. ここで、分出圧延とは、オープンロールを用いて混練物からシート化する圧延を指す。 Here, the dispensing rolling refers to rolling into a sheet from a kneaded product with an open roll.

そして、扁平状粉末のアスペクト比が8と107の比較材および10〜79の発明材について、インピーダンスアナライザーで1ターン法により、13.56MHzでの複素透磁率の実数部μ'と虚数部μ''とを測定した値、および該実数部μ'と虚数部μ''とから算出されるQ値を、表1に示す。 Then, the inventive materials of comparative material and 10 to 79 of the aspect ratio of the flat powder 8 and 107, by one turn method in impedance analyzer, the real part of the complex permeability at 13.56 MHz mu 'and the imaginary part mu' 'and values ​​were measured, and several portions said actual mu' and a Q value calculated from the imaginary part mu '', shown in Table 1. また図2に示すように、略名刺サイズのRFタグ14における裏面に、該タグ14に設けられるアンテナ12を覆う大きさの各比較材および発明材を貼付け、該RFタグ14の表面をリーダライタ16の読取り面(表面)に対向した状態で測定した通信距離を、複合磁性シート10を取付けない状態で測定した通信距離に対する差で表1に示す。 Further, as shown in FIG. 2, the back surface of the RF tag 14 of substantially business card size, Paste each comparative material and the invention material sized to cover the antenna 12 provided in the tag 14, the surface writer of the RF tag 14 16 reading surface (surface) on the communication distance was measured in the opposing state of, shown in Table 1 as the difference with respect to the communication distance was measured in the absence of attaching the composite magnetic sheet 10.

〔表1〕 [Table 1]
┏━━━┳━━━━━━━┳━━━━┳━━━━┳━━━━┳━━━━━━━━┓ ┏━━━┳━━━━━━━┳━━━━┳━━━━┳━━━━┳━━━━━━━━┓
┃ ┃ アスペクト比 ┃ 実数部 ┃ 虚数部 ┃ Q値 ┃ 通信距離(cm) ┃ ┃ ┃ aspect ratio ┃ real ┃ imaginary part ┃ Q value ┃ communication distance (cm) ┃
┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫ ┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫
┃比較材┃ 8 ┃ 23 ┃ 5.2 ┃ 4.4 ┃ +1.0 ┃ ┃ Comparative Material ┃ 8 ┃ 23 ┃ 5.2 ┃ 4.4 ┃ +1.0 ┃
┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫ ┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫
┃発明材┃ 10 ┃ 37 ┃ 6.7 ┃ 5.5 ┃ +5.0 ┃ ┃ invention material ┃ 10 ┃ 37 ┃ 6.7 ┃ 5.5 ┃ +5.0 ┃
┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫ ┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫
┃発明材┃ 21 ┃ 48 ┃ 7.8 ┃ 6.2 ┃ +5.0 ┃ ┃ invention material ┃ 21 ┃ 48 ┃ 7.8 ┃ 6.2 ┃ +5.0 ┃
┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫ ┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫
┃発明材┃ 48 ┃ 65 ┃ 8.4 ┃ 7.7 ┃ +4.5 ┃ ┃ invention material ┃ 48 ┃ 65 ┃ 8.4 ┃ 7.7 ┃ +4.5 ┃
┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫ ┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫
┃発明材┃ 79 ┃ 74 ┃ 9.8 ┃ 7.6 ┃ +4.6 ┃ ┃ invention material ┃ 79 ┃ 74 ┃ 9.8 ┃ 7.6 ┃ +4.6 ┃
┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫ ┣━━━╋━━━━━━━╋━━━━╋━━━━╋━━━━╋━━━━━━━━┫
┃比較材┃ 107 ┃ 83 ┃ 12 ┃ 6.9 ┃ +2.0 ┃ ┃ comparative material ┃ 107 ┃ 83 ┃ 12 ┃ 6.9 ┃ +2.0 ┃
┗━━━┻━━━━━━━┻━━━━┻━━━━┻━━━━┻━━━━━━━━┛ ┗━━━┻━━━━━━━┻━━━━┻━━━━┻━━━━┻━━━━━━━━┛

以上の結果から、複素透磁率の実数部μ'≧30,虚数部μ''≦10,Q値≧5の条件の内、実数部μ'およびQ値の条件を満たしていない、アスペクト比が8の比較材、および虚数部μ''の条件を満たしていないアスペクト比が107の比較材については、その通信距離の延長は僅かであった。 From the above results, the real part mu '≧ 30, the imaginary part mu' of complex magnetic permeability of the conditions '≦ 10, Q values ​​≧ 5, does not satisfy the condition of the real part mu' and Q values, aspect ratio 8 comparison material, and for comparative materials the aspect ratio does not satisfy the condition of the imaginary part mu '' is 107, the extension of the communication distance was small.

これに対して、扁平状粉末のアスペクト比が、10〜79の発明材については、複素透磁率の実数部μ'≧30,虚数部μ''≦10,Q値≧5の条件の全てを満たしており、その通信距離に関して大幅な延長が達成された。 In contrast, the aspect ratio of the flat powder, for the invention material 10-79, the real part mu '≧ 30, the imaginary part mu' of complex magnetic permeability all conditions' ≦ 10, Q value ≧ 5 filled and a significant extension was achieved with respect to the communication distance.

実施例に係る複合磁性シートを取付けたRFタグを示す概略図である。 Is a schematic diagram showing an RF tag attached to the composite magnetic sheet according to the embodiment. 実施例に係る複合磁性シートを用いたRFタグの通信距離を測定する実験の状態を示す説明図である。 It is an explanatory view showing a state of an experiment measuring the communication distance of an RF tag using the composite magnetic sheet according to the embodiment.

符号の説明 DESCRIPTION OF SYMBOLS

10 複合磁性シート,12 アンテナ,14 RFタグ(データキャリア) 10 composite magnetic sheet, 12 antenna, 14 RF tag (data carrier)

Claims (5)

  1. 非接触のデータキャリア(14)とリーダライタ(16)との間で電磁波によるデータの送受を行なう自動認識装置において、前記データキャリア(14)およびリーダライタ(16)の両方あるいは何れか一方におけるアンテナ(12)の裏面に配設される複合磁性シートであって、 In the automatic recognition system for transmitting and receiving data by electromagnetic waves with the non-contact data carrier (14) and a reader-writer (16), both or either antenna of one of the data carrier (14) and a reader-writer (16) (12) a composite magnetic sheet that is disposed on the rear surface of,
    前記複合磁性シート(10)は、扁平状の軟磁性粉末と結合剤とを配合して成形された柔軟性を有するシートであり、 It said composite magnetic sheet (10) is a sheet having flexibility which is formed by blending the flat soft magnetic powder and a binder,
    1〜20MHzにおける複素透磁率の実数部μ'が30以上で、虚数部μ''が10以下であることを特徴とする複合磁性シート。 The composite magnetic sheet real part of the complex permeability mu at 1~20MHz 'is more than 30, the imaginary part mu' 'is equal to or is 10 or less.
  2. 前記複素透磁率の実数部μ'と虚数部μ''の比であるQ値が5以上である請求項1記載の複合磁性シート。 The composite magnetic sheet according to claim 1, wherein Q value is the ratio of complex real part of the permeability mu 'and the imaginary part mu' 'is 5 or more.
  3. 前記結合剤がポリマーやエストラマー等の有機結合剤である請求項1または2記載の複合磁性シート。 The composite magnetic sheet according to claim 1 or 2, wherein the binder is an organic binder such as a polymer or elastomer.
  4. 軟磁性粉末の合金成分はFe−Si−Al系である請求項1〜3の何れかに記載の複合磁性シート。 The composite magnetic sheet according to any one of claims 1 to 3 alloy component of the soft magnetic powder is Fe-Si-Al system.
  5. 前記扁平状の軟磁性粉末のアスペクト比が、10〜80の範囲である請求項1〜4の何れかに記載の複合磁性シート。 The flat aspect ratio of the soft magnetic powder, a composite magnetic sheet according to claim 1 in the range of 10 to 80.
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