JP3799448B2

JP3799448B2 - Printed matter, authenticity determination method thereof, and authenticity determination device

Info

Publication number: JP3799448B2
Application number: JP2002368126A
Authority: JP
Inventors: 則行須藤
Original assignee: 独立行政法人国立印刷局
Priority date: 2002-12-19
Filing date: 2002-12-19
Publication date: 2006-07-19
Anticipated expiration: 2022-12-19
Also published as: JP2004199459A

Description

【０００１】
【発明の属する技術分野】
本発明は、銀行券、有価証券などの貴重印刷物において磁気を検知して真偽判別や券種判別をおこなう方法に係り、真性をチェックするときに磁気の有無や磁気分布を検出するだけでなく、磁性材料ごとに異なる残留磁束密度の磁化方向とバイアス磁界の磁化方向を利用して磁性材料の質を見分けることで、一般的な磁気センサだけでは判別が困難であった磁性材料の質を識別できるようにした印刷物、その真偽判別方法及び真偽判別装置に関する。
【０００２】
【従来の技術】
近年、銀行券、有価証券などの貴重印刷物の偽造を判別する技術が必要とされており、印刷物の真偽をチェックする各種の技術が提案されている。
その１つとして、印刷インキに用いた顔料に磁性を示す特徴がある場合に印刷デザインに応じた磁気パターンが得られることに着目し、例えば磁気センサを用いて印刷物の印刷画像部をスキャンして磁気の有無や磁気パターン波形を検知して、本物に類似してないものを偽造券として判別する方式がある。例えば、自販機やATMを始めとする紙幣処理装置は、この磁気センサを搭載して、得られた紙幣の磁気パターンや磁気の有無をもとに真偽判別や券種判別を行っている。
【０００３】
また、磁気インキに外部磁界を与えて磁束を保持させておき、その外部磁界を取り去った後で、該磁気インキの保磁力に応じてバイアス磁界を印加した磁気センサを用いて、目的とする磁気インキが通過するときには、磁気センサからの出力がでないようにするという技術もある（例えば、特許文献１参照。）。この技術は、それ以前の磁気検出方法が紙幣に磁性を与え、その磁界を取り去ったあとの残留磁束密度により、真正な磁性体を用いていることを判別するものであるのに対して、紙幣に磁性を与え、その磁界を取り去った後で、適当なバイアス磁界を印加して磁気センサを用いて測定することによって、磁気インキが真正の場合は出力が出ないようにした判別方法である。
【０００４】
【特許文献１】
特許第３０２８３８０号公報（第２頁）
【０００５】
【発明が解決しようとする課題】
しかしながら、銀行券や有価証券の偽造をみると磁気鉛筆を用いたり、複写技術を駆使した磁気転写方法などで本物に類似した偽造印刷物を作製して悪用する犯罪が発生している。現在、自販機やATMなどの紙幣処理装置に用いられている磁気センサには、例えばリング型磁気ヘッドやMRヘッドがある。しかし、どの磁気センサにおいても磁性材料の全ての特性を検知しているわけではないため、本物とは異なる磁性材料を適当な配合量でインキに混合した偽造券を、MRヘッド、リング型ヘッドなどの現行の磁気センサを用いて真性をチェックした際に、偽造券が真券に類似した磁気波形を示したときには誤判別することも想定される。また、流通する紙幣の中には、紙幣どうしの摩擦やＡＴＭなどの機械処理装置による摩擦でインキが摩耗して、真券に比べて磁気材料の物理量が減少したものも流通している。
【０００６】
このような偽造券を、摩耗した真券と混同せずに偽物として判別するためには、従来の磁気センサのみを用いた方式でチェックするだけでは確実性に欠ける。そもそも、リング型磁気ヘッドやMRヘッドなどの一般的な磁気センサで貴重印刷物をスキャンした出力波形は、僅かな磁界を印加して初期透磁率等の微分的な波形を検知しているため、これらのみを用いて磁気材料の違いを識別することは困難である。
【０００７】
たとえば、初期透磁率の低い磁性材料を大量に配合した磁気インキと、初期透磁率の高い材料を少量配合した磁気インキの２種類のインキを、リング型磁気ヘッドやMRヘッドで測定しても近似した検知電圧が得られてしまうことがある。
【０００８】
また、透磁率以外の磁気特性として保磁力あるいは残留磁束密度を評価する方法があげられるが、従来の測定装置はコストが高く大型であるため、ＡＴＭなどの紙幣処理装置へは搭載できない。
【０００９】
一方、前述した特許第３０２８３８０号は、紙幣に磁性を与え、その磁界を取り去った後で適当なバイアス磁界を印加して磁気センサを用いて測定することによって、磁気インキが真正の場合は出力が出ないようにした判別方法であるが、しかしながら、例えば、磁気センサが故障したとき、印刷物の搬送流れが悪く、磁気センサのスキャン位置がずれたとき、あるいは強い磁界発生源が磁気センサに接近したときには、磁気センサからは出力が無く、あるいは不正確な出力となるために誤判別をしてしまう恐れがある。
【００１０】
そこで、本発明では、例えば、大きな出力が得られる磁気インキと、相対的に小さな出力が得られる磁気インキの２種類の磁気インキを、少なくとも２個所の異なる位置に印刷することにより、磁気センサが故障したり、搬送流れが悪く磁気センサのスキャン位置がずれたり、あるいは強い磁界発生源が磁気センサに接近した場合等の異常な状態を認識できるようにしている。また、大きな出力が得られる磁気インキと、相対的に小さな出力が得られる磁気インキの少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷することにより、印刷物上の少なくとも２種類の磁気インキを検知することで、精度の良い真偽判別が行える印刷物及びその真偽判別方法を提供するものである。
【００１１】
更に、本発明では、昨今、高保磁力化がはかられたネオジウム磁石などの永久磁石を用いて磁気インキに残留磁束を印加して、その後に、フェライト磁石などで異なる方向に直流バイアス磁界を印加しながらリング型ヘッドなどの一般的な磁気センサで磁束を検知することで磁気インキの磁気質をもとにした判別が行える真偽判別装置を提供するものである。
【００１２】
【課題を解決するための手段】
本発明の印刷物は、基材上に、飽和磁界を印加したときの残留磁束密度が異なる少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷した印刷物であって、
真偽判別に際して、前記印刷物の少なくとも２個所の異なる位置の磁気インキ部分には、飽和磁界印加部により飽和磁界が印加されて残留磁束密度が保持され、
前記飽和磁界を印加させた印刷物は、磁束検知部に移動させられて、前記残留磁束密度の極性とは逆極性のバイアス磁界を印加することにより、前記少なくとも２種類の磁気インキがそれぞれ保持している前記残留磁束と前記バイアス磁界との打ち消し合いによる磁束の変化が検知され、その検出波形から少なくとも２種類の磁気インキの残留磁束方向への残留のしやすさ及びバイアス磁界方向への磁化のしやすさを読み取られ、前記少なくとも２種類の磁気インキの磁気質の違いが検知されるとともに、位置検知部により前記磁束の変化を検知した印刷物の少なくとも２種類の磁気インキの位置が検知され、あらかじめ記憶してある真正な印刷物上の少なくとも２種類の磁気インキの磁気質の違いと、規定位置とが照合されて真偽判別可能であることを特徴としている。
【００１３】
本発明の印刷物は、基材上に、飽和磁界を印加したときの残留磁束密度が異なる少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷した印刷物であって、
真偽判別に際して、前記印刷物の少なくとも２個所の異なる位置の磁気インキ部分には、飽和磁界印加部により飽和磁界が印加されて残留磁束密度が保持され、
前記飽和磁界を印加させた印刷物は、磁束検知部に移動させられて前記残留磁束密度の極性とは異なる方向にバイアス磁界が印加されることにより、前記少なくとも２種類の磁気インキがそれぞれ保持している前記残留磁束と前記バイアス磁界とを合成した２方向の磁気異方性による磁束の変化が検知され、その検出波形から少なくとも２種類の磁気インキの残留磁束方向への残留のしやすさ及びバイアス磁界方向への磁化のしやすさを読み取られ、前記少なくとも２種類の磁気インキの磁気質の違いが検知されるとともに、位置検知部により前記磁束の変化を検知した印刷物の少なくとも２種類の磁気インキの位置が検知され、あらかじめ記憶してある真正な印刷物上の少なくとも２種類の磁気インキの磁気質の違いと、規定位置とが照合されて真偽判別可能であることを特徴としている。
【００１４】
本発明の印刷物の真偽判別方法は、基材上に、飽和磁界を印加したときの残留磁束密度が異なる少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷した印刷物の真偽判別方法であって、
飽和磁界印加部によって、前記印刷物の少なくとも２個所の異なる位置の磁気インキ部分に、飽和磁界を印加して残留磁束密度を保持させ、
前記飽和磁界を印加させた印刷物を磁束検知部に相対的に移動させて、前記飽和磁界を印加させた印刷物に磁束検知部によって、前記残留磁束密度の極性とは逆極性のバイアス磁界を印加することにより、保持している前記残留磁束と前記バイアス磁界との打ち消し合いを生じさせて、該打ち消し合いによる磁束の変化を検知し、
前記検出波形から、少なくとも２種類の磁気インキの残留磁束方向への残留のしやすさ及びバイアス磁界方向への磁化のしやすさを読み取り、前記少なくとも２種類の磁気インキの磁気質の違いを検知するとともに、位置検知部により前記磁束の変化を検知した印刷物の少なくとも２種類の磁気インキの位置を検知し、あらかじめ記憶してある真正な印刷物上の少なくとも２種類の磁気インキの磁気質の違いと、規定位置とを照合して真偽判別することを特徴としている。
【００１５】
本発明では、初期透磁率以外の磁気的特性として磁気質を検知して判別するため、水平方向あるいは垂直方向に飽和磁界を印加して残留磁束密度を保持させ、その後に、飽和磁界の磁化方向とは異なる方向にバイアス磁界を印加しながら磁気センサで測定して、残留磁束密度とバイアス磁界との打ち消し合い或いはベクトル的な合成によって得られる磁気変化を検知する。それによって、残留磁束密度と透磁率とを加味した磁気質の検知が可能となり、極めて高い真偽判別が行なえるようにしている。
【００１６】
本発明の印刷物の真偽判別方法は、基材上に、飽和磁界を印加したときの残留磁束密度が異なる少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷した印刷物の真偽判別方法であって、
飽和磁界印加部によって、前記印刷物の少なくとも２個所の異なる位置の磁気インキ部分に、飽和磁界を印加して残留磁束密度を保持させ、
前記飽和磁界を印加させた印刷物を磁気検知部に相対的に移動させて、前記飽和磁界を印加させた印刷物に磁束検知部によって、前記残留磁束密度の極性とは異なる方向にバイアス磁界を印加することにより、保持している前記残留磁束と前記バイアス磁界とを合成した２方向の磁気異方性を生じさせて、該２方向の磁気異方性による磁束の変化を検知し、
前記検出波形から、少なくとも２種類の磁気インキの残留磁束方向への残留のしやすさ及びバイアス磁界方向への磁化のしやすさを読み取り、前記少なくとも２種類の磁気インキの磁気質の違いを検知するとともに、位置検知部により前記磁束の変化を検知した印刷物の少なくとも２種類の磁気インキの位置を検知し、あらかじめ記憶してある真正な印刷物上の少なくとも２種類の磁気インキの磁気質の違いと、規定位置とを照合して真偽判別することを特徴としている。
【００１７】
本発明の印刷物の真偽判別方法によれば、搬送の上流側に設けた飽和磁界印加手段によって磁気インキ部分に残留磁束密度を保持し、下流側に設けた磁束検知手段によって残留磁束密度とは逆極性に適切な強度のバイアス磁界を印加して磁気センサで検知している。
【００１８】
その結果、磁性材料の磁気的特性であるヒステリシスループ（保持力、残留磁束密度、飽和磁界、初期透磁率などが示されるカーブ）の相違によって、残留磁束とバイアス磁界との合成により磁性材料の性質ごとに異なる検知電圧と検知電圧波形が決定される。この検知電圧値と検知波形形状をもとにして、少なくとも２種類の磁性材料が所望の磁気インキが所望の位置にあるか否かによって真偽判別を行うことを特徴としている。
【００１９】
本発明の印刷物の真偽判別方法によれば、搬送の上流側に設けた被検出体の磁気インキ部分に飽和磁界を印加するための飽和磁界印加手段によって磁気インキ部分に残留磁束密度を保持し、下流側に設けた磁束検知手段によって残留磁束密度の極性とは異なる方向に適切な強度のバイアス磁界を印加して磁気センサで検知している。
【００２０】
その結果、残留磁束方向への残留のしやすさと、バイアス磁界方向への磁化のしやすさの合成により検知電圧が決定される。
【００２１】
ここで、「残留磁束方向の保持しやすさ」とは磁性材料の磁気的特性であるヒステリシスループにもとづいている。また、「バイアス磁界方向への磁化のしやすさ」とは保持した残留磁束密度の方向以外へバイアス磁界を印加したときの磁気材料の粒子形状（扁平、針状、粒状など）や印刷時での磁気材料の配向性などにもとづき決定される。本発明によって測定を行うと「残留磁束方向の保持しやすさ」と「バイアス磁界方向への磁化のしやすさ」とが合成されて磁化されやすい方向が決定され、いわゆる２方向の磁気異方性に基づいて、少なくとも２種類の所望の磁気インキが所望の位置にあるか否かを認識して真偽判別ができることを特徴としている。
【００２２】
本発明の真偽判別装置は、飽和磁界を印加したときの残留磁束密度が異なる少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷した印刷物の真偽判別装置であって、前記印刷物に、任意の方向に飽和磁界を印加して残留磁束密度を保持させる１個以上の永久磁石あるいは巻線コイルを任意の位置に所望の方向に向けて配設した飽和磁界印加部と、前記飽和磁界を印加した印刷物を磁束検知部に相対的に移動させて、前記磁束検知部に移動した印刷物に前記飽和磁界印加部の磁界方向とは逆極性のバイアス磁界を印加し、前記少なくとも２種類の磁気インキ部分の磁束変化を検知する磁束検知部と、からなるセンサ部と、
前記磁束変化を検知した印刷物の位置を検出する位置検知部と、
前記センサ部の磁束検知部から出力された磁束変化の検知信号の増幅及び波形成形を行うアンプ部と、
前記波形成形を行ったアンプ部で増幅及び波形成形処理した信号を磁気データとして記憶し、前記位置検知部からの位置信号を記憶するデータ記憶部と、前記少なくとも２種類の磁気インキの前記残留磁束密度と、前記バイアス磁界との打ち消し合いによる磁束の変化を磁気センサの磁束検知部で測定して得た検知電圧波形をもとに演算を行った少なくとも２種類の磁気インキの磁気質と、前記位置検知部からの位置信号を基準にして磁気データの位置ずれの補正を演算して、前記少なくとも２種類の磁気インキの印刷物の規定位置とが、予め記憶してある真正な印刷物上の少なくとも２種類の磁気インキの磁気質と、規定位置とがそれぞれ合致しているか否かを判定する真偽判定部と、
前記データ記憶部と前記真偽判定部とを制御するコンピュータ制御部と、
前記真偽判定部からの少なくとも２つの異なる磁気質を有する磁気インキが規定の位置にあるか否かの判定結果を出力する結果出力部と、
前記結果出力部の結果を表示する表示部と
を具備してなることを特徴としている。
【００２３】
ここで、「１個以上の永久磁石あるいは巻線コイルを所望の位置に所望の方向に向けて配設」とは、磁界印加手段および磁束検知手段において、磁束の印加方向を水平方向、垂直方向あるいはその中間の方向など任意に向ける方式で、例えば２個の筒型磁石を並べて、一方のＮ極から他方のＳ極に走る磁力線を利用して被検出体を任意方向に磁化させる方法が取り得る。この方法は、ＡＴＭなどの既存の紙幣処理装置の磁気センサに磁石を増設することで簡易に実現できることを特徴としている。
【００２４】
真偽判別装置は、残留磁束密度とバイアス磁界との打ち消し合いによる磁束の変化を、磁気センサで測定して得た検知電圧波形をもとに演算を行うが、本発明の測定方法では、磁性材料ごとに異なる検知電圧や検知電圧波形がえられ、所望の検知電圧や検知電圧波形の形状が規定位置にあるか否かをもとにして高精度な判別演算がおこなえる特徴がある。また、例えば、検知した検知電圧が予め記憶してある照合用パターンに類似しているか否かによって判別するなどの周知の演算方法も取り得る。本発明の真偽判別装置は、このような方法で、高精度な真偽判別が行えることを特徴としている。
【００２５】
本発明の真偽判別装置は、飽和磁界を印加したときの残留磁束密度が異なる少なくとも２種類の磁気インキを、少なくとも２個所の異なる位置に印刷した印刷物の真偽判別装置であって、前記印刷物に、任意の方向に飽和磁界を印加して残留磁束密度を保持させる１個以上の永久磁石あるいは巻線コイルを所望の位置に所望の方向に向けて配設した飽和磁界印加部と、前記飽和磁界を印加した印刷物を磁束検知部に相対的に移動させて、前記磁束検知部に移動した印刷物に前記飽和磁界印加部の磁界方向とは異なる方向にバイアス磁界を印加し、前記少なくとも２種類の磁気インキ部分の磁束変化を検知する磁束検知部と、からなるセンサ部と、
前記磁束変化を検知した印刷物の位置を検出する位置検知部と、
前記センサ部の磁束検知部から出力された磁束変化の検知信号の増幅及び波形成形を行うアンプ部と、
前記波形成形を行ったアンプ部で増幅及び波形成形処理した信号を磁気データとして記憶し、前記位置検知部からの位置信号を記憶するデータ記憶部と、前記少なくとも２種類の磁気インキの前記残留磁束密度と、前記バイアス磁界とを合成した方向、いわゆる２方向の磁気異方性による磁束の変化を磁気センサの磁束検知部で測定して得た検知電圧波形をもとに演算を行った少なくとも２種類の磁気インキの磁気質と、前記位置検知部からの位置信号を基準にして磁気データの位置ずれの補正を演算して、前記少なくとも２種類の磁気インキの印刷物の規定位置とが、予め記憶してある真正な印刷物上の少なくとも２種類の磁気インキの磁気質と、規定位置とがそれぞれ合致しているか否かを判定する真偽判定部と、
前記データ記憶部と前記真偽判定部とを制御するコンピュータ制御部と、
前記真偽判定部からの少なくとも２つの異なる磁気質を有する磁気インキが規定の位置にあるか否かの判定結果を出力する結果出力部と、
前記結果出力部の結果を表示する表示部と
を具備してなることを特徴としている。
【００２６】
真偽判別装置は、残留磁束密度とバイアス磁界とを合成した方向、いわゆる２方向の磁気異方性による磁束の変化をもとにして、磁気センサで測定した検知電圧波形をもとにして演算を行うが、本発明の測定方法では、磁性材料ごとに異なる検知電圧や検知電圧波形がえられ、所望の検知電圧波形の形状が規定位置にあるか否かをもとにして高精度な判別演算がおこなえる特徴がある。また、例えば、検知した検知電圧が予め記憶してある照合用パターンに類似しているか否かによって判別するなどの周知の演算方法も取り得る。本発明の真偽判別装置は、このような方法で、高精度な真偽判別が行えることを特徴としている。
【００２７】
【発明の実施の形態】
以下、本発明の実施例について図面を参照して説明する。
本発明の真偽判別方法としては２種類あり、１つは飽和磁界印加手段によって磁気インキ（１）に残留磁束密度を保持させて、その後に磁束検知手段によって保持した残留磁束密度と逆極性にバイアス磁界を印加する方法で、以下、「逆極性にバイアス磁化する方法」という。もう１つは飽和磁界印加手段によって磁性インキに残留磁束密度を保持させて、その後に磁束検知手段によって保持した残留磁束密度と異なる方向のバイアス磁界を印加する方法で、以下、「異なる方向にバイアス磁化する方法」という。また、これらの真偽判別方法を用いて飽和磁界を印加した時の残留磁束密度が異なる少なくとも２種類の異なる位置に印刷した印刷物を真偽判別する真偽判別装置と共に説明する。
【００２８】
図１は、本発明の２種類の真偽判別方法を説明した図であり、図１（ａ）は、逆極性にバイアス磁化する方法を模式図で示したもので、飽和磁界印加手段によって、磁気インキ（１）に飽和磁界（５）（磁界方向は左側がＮ極、右側がＳ極）を印加して残留磁束密度（３）を保持させた後で、磁束検知手段によって残留磁束密度（３）を保持した磁気インキ（１）に逆極性のバイアス磁界（４）（磁界方向は左側がＳ極、右側がＮ極）を印加させる。このとき、磁束検知手段に配設したリング型ヘッドなどの磁気センサで測定すると、保持している残留磁束密度（３）とバイアス磁界（４）との打ち消し合いによる磁束の変化を検知できる。つまり、磁気インキ（１）に残留している磁束を、バイアス磁界（４）によってどれだけ逆方向に変化させたかを測定することで、残留していた残留磁束の量を検知しようとするものである。
【００２９】
図１（ｂ）は、異なる方向へバイアス磁化する方法を模式図で示したもので、飽和磁界印加手段によって、磁気インキ（１）に飽和磁界（５）（磁界方向は上側がＮ極、下側がＳ極）を印加して残留磁束密度（３）を保持させた後で、磁束検知手段によって残留磁束密度（３）を保持した磁気インキ（１）に異なる方向のバイアス磁界（４）（磁界方向は左側がＳ極、右側がＮ極）を印加させる。このとき、磁束検知手段に設置したリング型ヘッドなどの磁気センサで測定すると、保持している残留磁束密度（３）とバイアス磁界（４）との合成による磁束の変化を検知できる。つまり、磁気インキ（１）に残留している磁束を、バイアス磁界（４）によってどれだけ異なる方向に変化させたかを測定することで、残留していた残留磁束の量を検知しようとするものである。
【００３０】
本発明の印刷物は、このような真偽判別が可能な飽和磁界を印加した時の残留密度が異なる少なくとも２種類の異なる位置に印刷する、という構成である。
【００３１】
図２は、図１（ａ）で説明した、逆極性にバイアス磁化する方法について、ヒステリシスループに照らし合わせて説明したものである。磁気インキ（Ａ）及び磁気インキ（Ｂ）は、通常の磁気センサで測定すると同等な検知電圧が得られるが、飽和磁界を印加したときの残留磁束密度は異なるものとする。前記磁気インキ（Ａ）及び磁気インキ（Ｂ）を任意の位置に印刷した印刷物を、飽和磁界印加手段と磁束検知手段に対して相対的に移動させて、前記印刷物上の磁気インキ（Ａ）の部分が飽和磁界印加手段に到達すると、磁気インキ（Ａ）はＨｍの飽和磁界が印加されてヒステリシスループにおけるＯ点からＡ1点に磁化させる（仮に、磁気インキに予め残留磁束密度があった場合もＡ1点に磁化されると解釈する）。続いて、前記磁気インキ（Ａ）の部分が移動して飽和磁界印加手段から離れると、Ｈｍの飽和磁界から解放されて、カーブ上のＡ1点からＢ1点に移り、いわゆる残留磁束密度Ｂ１が保持される。続いて、前記磁気インキ（Ａ）の部分がさらに移動して磁束検知手段に到達すると、逆極性のバイアス磁界−Ｈｍが印加されるためＣ1点に移動する。これと同時に、リング型ヘッドなどの磁気センサで測定するとＣ1点での磁束の変化量が検知できる。
【００３２】
前記相対的に移動とは、印刷物を動かすようにしても良いし、又は装置側を動かすようにしても良いように構成することである。
【００３３】
一方、印刷物上の磁気インキ（Ｂ）の場合も、前述した磁気インキ（Ａ）と同様に、ヒステリシスループにおいて、Ａ2点→Ｂ2点→Ｃ2点と移動する。
【００３４】
２つの磁気インキを比較すると、磁気インキ（Ｂ）は磁性インキ（Ａ）より内側にループを描いているため、Ｃ2点はＣ1点に比べて保持している磁束密度が小さくなっており、２つの磁気インキをリング型ヘッドなどの磁気センサで測定することにより判別が可能となる。
【００３５】
このように、本発明の真偽判別方法及び装置による測定では、飽和磁界印加手段により磁気インキに残留磁束密度を持たせた後に、逆極性のバイアス磁界を印加して測定を行うため、磁気材料の残留磁束密度と透磁率とを加味した検知ができ、これにより磁気質を検知した判別が可能である。
【００３６】
以上詳述した本発明による真偽判別方法及び装置による測定に対して、磁気センサを用いた公知の測定方法では、微弱な磁界強度Ｈを印加して測定するため、図２のＯ点の近傍での透磁率μの変化量（ΔＢ／ΔＨ）を検知するのみであり、磁気質を検知することはできない。
【００３７】
以上、本発明の２種類の真偽判別方法のうち、逆極性にバイアス磁化する方法についてヒステリシスループに照らし合わせて説明してきたが、もう一つの、異なる方向にバイアス磁化する方法についてもほぼ同じ原理となっている。異なる点は、飽和磁界印加手段において図１（ａ）に示すような水平方向ではなく、例えば図１（ｂ）に示すように垂直方向に飽和磁界を印加する点であり、垂直方向に残留磁束密度を保持した後で水平方向にバイアス磁界を印加すると、垂直方向の残留磁束と水平方向の磁化されやすさとのベクトル的な合成の検知が可能となり、いわゆる磁気異方性をも検知することができる。
なお、飽和磁界を印加する方向は、図１（ａ）及び（ｂ）に示す方向に限定されることなく、それ以外の方向も取り得る。
【００３８】
次に、具体的な実施例を示して本発明を更に詳細に説明する。
（実施例）図３は、本発明の印刷物の一例を示す書類（７）で、平面図と模式的断面図である。磁気質が異なる磁性材料として、本実施例においては、フェライト粉と軟磁性ステンレス紛の２種類を選定した。フェライト粉の粉末での特性は、飽和磁束密度が約80emu/g程度、保持力が40Oe程度、平均粒径が4.5〜6.5μｍである。軟磁性ステンレス紛の粉体での特性は、飽和磁束密度が124emu/g程度、保持力が29Oe程度、平均粒径が約4μｍでフレーク形状である。
【００３９】
この２種類の磁性材料をワニスなど（詳細を明記せず）に配合して、公知のインキ作製方法に基づいて、それぞれの磁性インキを作製した。以下、フェライト粉を用いたインキをフェライト紛磁気インキ、軟磁性ステンレス紛を用いたインキをステンレス紛磁気インキという。インキ中の磁性材料の配合割合は、フェライト紛磁気インキ（９）では15weight%、ステンレス紛磁気インキ（１０）では3weight％とした。これらの配合割合が異なる理由は、リング型ヘッドによる公知の測定方法において同じ程度に検知電圧が得られるようにインキを調整しておき、公知の測定方法と本発明の測定方式とを比較するためである。
【００４０】
図３は、前記２種類の磁気インキを用いて上質紙（８）に印刷して得た書類（７）である。印刷方式としては、インキ量を多く転写できる凹版印刷方式で行い、「Ｍ」という文字をフェライト紛磁気インキ（９）で、「Ｎ」という文字をステンレス紛磁気インキ（１０）を用いて、画線高さ30μm程度のインキ盛り量でそれぞれの磁気インキを付与した。
【００４１】
図４は、本発明の印刷物の真偽判別方法により、印刷物を判別する真偽判別装置の一実施例である。この真偽判別装置は、センサ部（１１）、位置検知部（１２）、アンプ部（１３）、真偽判別のための制御部（１４）、結果出力部（１５）及び表示部（１６）から構成されている。
センサ部（１１）は、２つの永久磁石とリング型ヘッドからなり、永久磁石で水平方向にバイアス磁界を形成してリング型ヘッドで磁束の変化を検知するが詳しくは後述する。
位置検知部は（１２）、書類の位置を検出する装置で、磁気センサの走査位置が正確に特定できるものである。
アンプ部（１３）は、センサ部から出力された検知信号の増幅や波形整形を行うものである。
制御部（１４）は、データ記憶部（１７）及び真偽判定部（１８）を持ち、データ記憶部（１７）は磁気センサからの信号を磁気データとして記憶し、真偽判定部（１８）は位置検知部（１２）からの信号を基準にして磁気データの位置ずれを補正してフェライト紛磁気インキ（９）及びステンレス紛磁気インキ（１０）が書類（７）の規定位置に有るか否かを判定する。
結果出力部（１５）は真偽判定部（１８）からの判定結果を出力する。
表示部（１６）は結果出力部（１５）の結果を表示する。
【００４２】
図５は、本発明の真偽判別装置のセンサ部の構成を示したものである。図５（ａ）において、飽和磁界印加部（１９）は、外形φ8mm×5mm、磁力0.4Tのネオジウム磁石（２０）を用いて、Ｎ極の面を書類（７）に向けて、搬送されてくる書類（７）との間隔を0.5mmに設置した。磁束検知部（２１）はリング型ヘッド（２３）と２つのフェライト磁石（２２）で構成した。リング型ヘッド（２３）は、自販機等に用いられる一般的なものを用いて、書類（７）に軽く接触するように設置した。磁束検知部（２１）のバイアス磁界（４）を得るために、外形寸法が縦10mm×横3mm×厚さ2mm、磁力0.06Tのフェライト磁石（２２）を２個設置した。磁極の方向は、図５（ｂ）に示すように、書類（７）の搬送方向手前にＳ極に向けたが、この配置はリング型ヘッド（２３）の直下において書類（７）に保持した残留磁束とは異なる方向に磁束をかけられるように工夫した。
【００４３】
また、飽和磁界印加部（１９）と磁束検知部（２１）との距離を40mmに配設したが、飽和磁界印加部（１９）のネオジウム磁石（２０）が磁束検知部（２１）の検知に影響を与えない距離とすれば良い。なお、図５に示したネオジウム磁石（２０）、フェライト磁石（２２）及びリング型ヘッド（２３）は、例えば巻き線コイルなどの他のものも取り得る。
【００４４】
図６は、書類（７）を搬送速度１ｍ／秒で移動させたときの結果を示したものである。図６（ａ）は、図３で作製した書類を、本発明の真偽判別装置で測定した検知電圧の波形を示し、図６（ｂ）は、同じ書類を直流バイアス磁界を印加した一般的なリング型ヘッドの測定方法で測定した時の検知電圧の波形を示したものである。また、図６（ａ）は、搬送速度１ｍ／秒で書類（７）を移動させて測定した結果を示しているが、フェライト紛磁気インキよりステンレス紛磁気インキの検知電圧が小さい結果であった。
【００４５】
このことを図７に示すヒステリシスループで説明する。書類（７）が飽和磁界印加手段に到達するとネオジウム磁石により0.4Tの飽和磁界（５）が印加されて、フェライト粉磁気インキとステンレス粉磁気インキの２種類の磁気インキはヒステリシスループ上のＯ点からＡ1、Ａ2にそれぞれ移る。書類（７）が移動してネオジウム磁石の磁力から解放されるとそれぞれ垂直方向の残留磁束密度Ｂ1、Ｂ2を保持する。さらに移動して磁束検知手段に到達すると、フェライト磁石により0.06Tの水平方向のバイアス磁界（４）が印加されてそれぞれループ上のＣ1、Ｃ2に移る。このときバイアス磁界（４）をかけながらリング型ヘッドで測定するとＣ1、Ｃ2の磁束の変化量を検知できる。磁束密度をみると、フェライト紛磁気インキがＢc1であるのに対しステンレス紛磁気インキはＢc2であり、磁束密度が小さく、その結果が図６(a)の検知電圧の波形に示されている。
【００４６】
図４の真偽判別装置のセンサ部（１１）で検知された、図６(a)に示す書類（７）の波形は、アンプ部（１３）で増幅と波形整形を行って、また必要な場合は回路フィルタでノイズ成分を除去して制御部（１４）に磁気データとして記憶される。一方、位置検知部（１２）であるロータリエンコーダから制御部に位置信号として入力される。制御部（１４）は磁気データと位置信号より、書類（７）の走査位置を正確に特定して真偽判定演算を行って、フェライト紛またはステンレス紛の磁気インキが規定の位置に検出できた場合に結果出力部（１５）に真性の信号を送る。なお、真偽判別装置のアンプ部（１１）、制御部（１４）、結果出力部（１５）及び表示部（１６）は周知の回路やアルゴリズムを利用してもよい。
【００４７】
【発明の効果】
以上詳述したように、本発明によれば、印刷物には磁気インキに残留磁束を印加して、その後に異なる方向に直流バイアス磁界を印加しながら、一般的な磁気センサで磁束を検知しているので、残留磁束密度と透磁率とを加味した磁気質の検知が可能となり、極めて高い真偽判別を行うことができる。
【００４８】
また、本発明の印刷物の真偽判別方法によれば、搬送の上流側に設けた飽和磁界印加手段によって磁気インキ部分に残留磁束密度を保持し、下流側に設けた磁束検知手段によって残留磁束密度とは逆極性に適切な強度のバイアス磁界を印加して磁気センサで検知しているので、磁性材料の磁気的特性であるヒステリシスループの相違によって、残留磁束とバイアス磁界との打ち消し合いにより磁性材料の性質ごとに異なる検知電圧と検知電圧波形が決定され、この検知電圧値と検知波形形状をもとにして、少なくとも２種類の磁性材料が所望の磁気インキが所望の位置にあるか否かによって真偽判別を行うことができる。
【００４９】
本発明の真偽判別装置は、残留磁束密度とバイアス磁界とを合成した方向、いわゆる２方向の磁気異方性による磁束の変化をもとにして、磁気センサで測定した検知電圧波形をもとにして演算を行うが、本発明の測定方法では、磁性材料ごとに異なる検知電圧や検知電圧波形がえられ、所望の検知電圧波形の形状が規定位置にあるか否かをもとにして高精度な判別演算がおこなえ、また、一般に周知の演算方法も取り得る。本発明の真偽判別装置は、このような方法で、高精度な真偽判別が行えることを特徴としている。
【図面の簡単な説明】
【図１】本発明の２種類の真偽判別方法の模式図を示す。
【図２】図１（ａ）で説明した、逆極性にバイアス磁化する方法について、ヒステリシスループで説明した図を示す。
【図３】本発明の磁気印刷物の一実施例を示す。
【図４】本発明の真偽判別装置の一実施例を示す。
【図５】本発明の真偽判別装置のセンサ部の構成を示す。
【図６】本発明の印刷物を搬送速度１ｍ／秒で移動したときの結果を示す。
【図７】ヒステリシスループを示す。
【符号の説明】
１磁気インキ
２磁石
３残留磁束密度
４バイアス磁界
５飽和磁界
６磁区
７書類
８上質紙
９フェライト粉磁気インキ
１０ステンレス粉磁気インキ
１１センサ部
１２位置検知部
１３アンプ部
１４制御部
１５結果出力部
１６表示部
１７データ記憶部
１８真偽判定部
１９飽和磁界印加部
２０ネオジウム磁石
２１磁束検知部
２２フェライト磁石
２３リング型ヘッド
２４フェライト粉磁気インキのヒステリシス曲線
２５ステンレス粉磁気インキのヒステリシス曲線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of detecting authenticity and ticket type discrimination by detecting magnetism in valuable printed matter such as banknotes and securities, and not only detecting the presence or absence of magnetism and magnetic distribution when checking authenticity. By identifying the magnetic material quality using the magnetization direction of the residual magnetic flux density and the magnetic field of the bias magnetic field, which are different for each magnetic material, it is possible to identify the quality of the magnetic material that was difficult to discriminate using only a general magnetic sensor. The present invention relates to a printed material, a method for determining authenticity thereof, and a device for determining authenticity.
[0002]
[Prior art]
In recent years, a technique for discriminating forgery of valuable printed matter such as banknotes and securities has been required, and various techniques for checking the authenticity of printed matter have been proposed.
As one of them, paying attention to the fact that the magnetic pattern according to the print design is obtained when the pigment used in the printing ink has a magnetic property, for example, the printed image portion of the printed material is scanned using a magnetic sensor. There is a method of detecting presence / absence of magnetism and a magnetic pattern waveform, and discriminating a thing that is not similar to the real one as a forged ticket. For example, banknote processing devices such as vending machines and ATMs are equipped with this magnetic sensor, and perform authenticity determination and ticket type determination based on the magnetic pattern of the obtained banknote and the presence or absence of magnetism.
[0003]
In addition, an external magnetic field is applied to the magnetic ink to hold the magnetic flux, and after removing the external magnetic field, a target magnetic field is applied using a magnetic sensor to which a bias magnetic field is applied according to the coercive force of the magnetic ink. There is also a technique for preventing output from a magnetic sensor when ink passes (see, for example, Patent Document 1). This technology is used to determine that a genuine magnetic material is used based on the residual magnetic flux density after the magnetic detection method gives magnetism to the bill and removes the magnetic field. This is a discrimination method in which an output is not output when the magnetic ink is authentic by applying an appropriate bias magnetic field and measuring using a magnetic sensor after removing the magnetic field.
[0004]
[Patent Document 1]
Japanese Patent No. 3028380 (2nd page)
[0005]
[Problems to be solved by the invention]
However, forgery of banknotes and securities, there are crimes that use magnetic pencils or produce counterfeit printed materials similar to the real ones using magnetic transfer methods that make full use of copying technology. Currently, magnetic sensors used in banknote processing devices such as vending machines and ATMs include, for example, ring-type magnetic heads and MR heads. However, not all magnetic sensors detect all the characteristics of magnetic materials. For this reason, counterfeit tickets in which magnetic materials different from the real one are mixed with ink in an appropriate blending amount, MR heads, ring-type heads, etc. When the authenticity is checked using the current magnetic sensor, it is assumed that the counterfeit ticket is erroneously discriminated when the counterfeit ticket shows a magnetic waveform similar to the genuine note. In addition, among the banknotes in circulation, those in which the physical amount of the magnetic material is reduced compared to the genuine bills are also circulated because the ink is worn due to the friction between the bills or the friction of a mechanical processing device such as ATM.
[0006]
In order to discriminate such a counterfeit ticket as a counterfeit without being confused with a worn genuine note, there is no certainty just by checking with a method using only a conventional magnetic sensor. In the first place, the output waveform obtained by scanning a precious printed matter with a general magnetic sensor such as a ring type magnetic head or MR head detects a differential waveform such as initial permeability by applying a slight magnetic field. It is difficult to distinguish between magnetic materials using only
[0007]
For example, two types of ink, magnetic ink containing a large amount of magnetic material with a low initial permeability and magnetic ink containing a small amount of a material with a high initial permeability, can be approximated by measuring with a ring-type magnetic head or MR head. The detected voltage may be obtained.
[0008]
Moreover, although the method of evaluating a coercive force or a residual magnetic flux density is mention | raise | lifted as magnetic characteristics other than a magnetic permeability, Since the conventional measuring apparatus is expensive and large, it cannot be mounted in banknote processing apparatuses, such as ATM.
[0009]
On the other hand, the above-mentioned Japanese Patent No. 3028380 gives magnetism to a bill, and after removing the magnetic field, applies an appropriate bias magnetic field and measures using a magnetic sensor, so that the output is obtained when the magnetic ink is authentic. However, for example, when a magnetic sensor breaks down, the transport of printed matter is bad, the scanning position of the magnetic sensor is shifted, or a strong magnetic field generation source approaches the magnetic sensor. In some cases, there is no output from the magnetic sensor, or there is a risk of misjudgment due to inaccurate output.
[0010]
Therefore, in the present invention, for example, the magnetic sensor is formed by printing two types of magnetic inks, that is, magnetic ink capable of obtaining a large output and magnetic ink capable of obtaining a relatively small output at at least two different positions. It is possible to recognize an abnormal state such as when a failure occurs, the transport flow is poor, the scan position of the magnetic sensor is shifted, or a strong magnetic field generation source approaches the magnetic sensor. In addition, at least two types of magnetic ink, that is, a magnetic ink that can provide a large output and a magnetic ink that can provide a relatively small output, are printed on at least two different positions, thereby providing at least two types of magnetic ink on the printed matter. It is an object of the present invention to provide a printed matter capable of accurately determining authenticity by detecting ink and a method for determining authenticity thereof.
[0011]
Furthermore, in the present invention, recently, a residual magnetic flux is applied to magnetic ink using a permanent magnet such as a neodymium magnet with a high coercive force, and then a DC bias magnetic field is applied in a different direction with a ferrite magnet or the like. The present invention also provides a true / false discriminating device capable of discriminating based on the magnetic quality of magnetic ink by detecting magnetic flux with a general magnetic sensor such as a ring-type head.
[0012]
[Means for Solving the Problems]
The printed matter of the present invention is a printed matter in which at least two kinds of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed on at least two different positions on a substrate,
At the time of authenticity determination, a saturation magnetic field is applied by a saturation magnetic field application unit to a magnetic ink portion at a different position in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved to the magnetic flux detection unit, and a bias magnetic field having a polarity opposite to the polarity of the residual magnetic flux density is applied, whereby the at least two types of magnetic inks are held respectively. A change in magnetic flux due to cancellation of the residual magnetic flux and the bias magnetic field is detected, and from the detected waveforms, at least two types of magnetic ink are likely to remain in the residual magnetic flux direction and magnetization in the bias magnetic field direction is detected. The ease of reading is detected, the difference in magnetic quality of the at least two types of magnetic ink is detected, and the position of at least two types of magnetic ink on the printed matter in which the change in magnetic flux is detected by the position detection unit is detected in advance. The difference between the magnetic quality of at least two types of magnetic ink on the stored genuine print and the specified position can be verified to determine the authenticity It is characterized in that.
[0013]
The printed matter of the present invention is a printed matter in which at least two kinds of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed on at least two different positions on a substrate,
At the time of authenticity determination, a saturation magnetic field is applied by a saturation magnetic field application unit to a magnetic ink portion at a different position in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved to the magnetic flux detection unit and a bias magnetic field is applied in a direction different from the polarity of the residual magnetic flux density, so that the at least two kinds of magnetic inks are held respectively. A change in magnetic flux due to magnetic anisotropy in two directions obtained by synthesizing the residual magnetic flux and the bias magnetic field is detected. Ease of remaining in the residual magnetic flux direction of at least two types of magnetic ink from the detected waveform and bias At least two types of magnetic inks in the printed matter, which are read for ease of magnetization in the magnetic field direction, the difference in magnetic quality of the at least two types of magnetic inks is detected, and the change of the magnetic flux is detected by the position detection unit The position of the ink is detected and the difference between the magnetic properties of at least two types of magnetic ink on the genuine print stored in advance is compared with the specified position. It is characterized by being in a possible authenticity discrimination.
[0014]
The printed matter authenticity determination method of the present invention is a method for determining the authenticity of a printed matter in which at least two types of magnetic inks having different residual magnetic flux densities when a saturated magnetic field is applied are printed on at least two different positions on a substrate. A method,
A saturation magnetic field application unit applies a saturation magnetic field to magnetic ink portions at different positions in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved relatively to the magnetic flux detection unit, and a bias magnetic field having a polarity opposite to the polarity of the residual magnetic flux density is applied to the printed matter to which the saturation magnetic field is applied by the magnetic flux detection unit. Thereby causing cancellation of the retained magnetic flux and the bias magnetic field, and detecting a change in magnetic flux due to the cancellation,
From the detected waveform, read the easiness of at least two types of magnetic ink in the residual magnetic flux direction and the ease of magnetization in the bias magnetic field direction, and detect the difference in magnetic quality of the at least two types of magnetic ink. In addition, the position detection unit detects the position of at least two types of magnetic ink on the printed matter in which the change in magnetic flux is detected, and the difference between the magnetic qualities of at least two types of magnetic ink on the genuine printed matter stored in advance. The authenticity is determined by collating with the specified position.
[0015]
In the present invention, in order to detect and discriminate magnetic properties as magnetic characteristics other than the initial permeability, a saturation magnetic field is applied in the horizontal direction or the vertical direction to maintain the residual magnetic flux density, and then the magnetization direction of the saturation magnetic field. Measured by a magnetic sensor while applying a bias magnetic field in a different direction, and detects a magnetic change obtained by canceling the residual magnetic flux density and the bias magnetic field or by vector combination. As a result, it is possible to detect the magnetic quality in consideration of the residual magnetic flux density and the magnetic permeability, and an extremely high authenticity determination can be performed.
[0016]
The printed matter authenticity determination method of the present invention is a method for determining the authenticity of a printed matter in which at least two types of magnetic inks having different residual magnetic flux densities when a saturated magnetic field is applied are printed on at least two different positions on a substrate. A method,
A saturation magnetic field application unit applies a saturation magnetic field to magnetic ink portions at different positions in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved relatively to the magnetic detection unit, and a bias magnetic field is applied to the printed matter to which the saturation magnetic field is applied in a direction different from the polarity of the residual magnetic flux density by the magnetic flux detection unit. By generating a magnetic anisotropy in two directions by combining the residual magnetic flux and the bias magnetic field that are held, a change in magnetic flux due to the magnetic anisotropy in the two directions is detected,
From the detected waveform, read the easiness of at least two types of magnetic ink in the residual magnetic flux direction and the ease of magnetization in the bias magnetic field direction, and detect the difference in magnetic quality of the at least two types of magnetic ink. In addition, the position detection unit detects the position of at least two types of magnetic ink on the printed matter in which the change in magnetic flux is detected, and the difference between the magnetic qualities of at least two types of magnetic ink on the genuine printed matter stored in advance. The authenticity is determined by collating with the specified position.
[0017]
According to the printed matter authenticity determination method of the present invention, the residual magnetic flux density is held in the magnetic ink portion by the saturation magnetic field application means provided on the upstream side of the conveyance, and the residual magnetic flux density is determined by the magnetic flux detection means provided on the downstream side. A magnetic field is detected by applying a bias magnetic field having an appropriate strength to the reverse polarity.
[0018]
As a result, depending on the hysteresis loop (curve showing coercive force, residual magnetic flux density, saturation magnetic field, initial magnetic permeability, etc.) that is the magnetic characteristic of the magnetic material, the properties of the magnetic material are synthesized by combining the residual magnetic flux and the bias magnetic field. Different detection voltages and detection voltage waveforms are determined for each. Based on the detected voltage value and the detected waveform shape, it is characterized in that at least two kinds of magnetic materials perform true / false determination based on whether a desired magnetic ink is at a desired position.
[0019]
According to the printed matter authenticity determination method of the present invention, the residual magnetic flux density is maintained in the magnetic ink portion by the saturation magnetic field applying means for applying the saturation magnetic field to the magnetic ink portion of the detected object provided on the upstream side of the conveyance. The magnetic sensor is detected by applying a bias magnetic field having an appropriate strength in a direction different from the polarity of the residual magnetic flux density by the magnetic flux detection means provided on the downstream side.
[0020]
As a result, the detection voltage is determined by the combination of the ease of remaining in the direction of the residual magnetic flux and the ease of magnetization in the direction of the bias magnetic field.
[0021]
Here, “ease of holding in the direction of residual magnetic flux” is based on a hysteresis loop which is a magnetic characteristic of the magnetic material. “Ease of magnetization in the direction of the bias magnetic field” means the particle shape (flat, needle, granular, etc.) of the magnetic material when a bias magnetic field is applied in a direction other than the direction of the retained magnetic flux density, and during printing. It is determined based on the orientation of the magnetic material. When the measurement is performed according to the present invention, “easy to maintain the residual magnetic flux direction” and “easy to magnetize in the direction of the bias magnetic field” are combined to determine the direction in which magnetization is easy, so-called two-direction magnetic anisotropy. Based on the characteristics, it is possible to determine whether or not at least two kinds of desired magnetic inks are at desired positions and determine whether they are true or false.
[0022]
The authenticity determination apparatus of the present invention is an authenticity determination apparatus for printed matter in which at least two kinds of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed at at least two different positions. A saturation magnetic field application unit in which one or more permanent magnets or winding coils for applying a saturation magnetic field in an arbitrary direction to maintain a residual magnetic flux density are disposed in an arbitrary position in a desired direction; A printed matter to which a magnetic field is applied is moved relative to the magnetic flux detection unit, and a bias magnetic field having a polarity opposite to the magnetic field direction of the saturation magnetic field application unit is applied to the printed matter that has moved to the magnetic flux detection unit. A magnetic flux detection unit for detecting a magnetic flux change in the magnetic ink part, and a sensor unit comprising:
A position detection unit for detecting the position of the printed matter in which the magnetic flux change is detected;
An amplifier unit for performing amplification and waveform shaping of a detection signal of magnetic flux change output from the magnetic flux detection unit of the sensor unit;
A signal that has been amplified and waveform-shaped by the amplifier unit that has performed the waveform shaping is stored as magnetic data, a data storage unit that stores a position signal from the position detection unit, and the residual magnetic flux of the at least two types of magnetic inks The magnetic quality of at least two types of magnetic inks calculated based on the detected voltage waveform obtained by measuring the change in magnetic flux due to cancellation of the density and the bias magnetic field with the magnetic flux detection unit of the magnetic sensor, and The correction of the positional deviation of the magnetic data is calculated on the basis of the position signal from the position detection unit, and the specified positions of the at least two types of magnetic ink printed matter are at least two on the genuine printed matter stored in advance. A true / false determination unit that determines whether or not the magnetic quality of the type of magnetic ink and the specified position match each other;
A computer control unit that controls the data storage unit and the authenticity determination unit;
A result output unit for outputting a determination result as to whether or not magnetic ink having at least two different magnetic qualities from the authenticity determination unit is in a specified position;
A display unit for displaying a result of the result output unit;
It is characterized by comprising.
[0023]
Here, “one or more permanent magnets or winding coils are arranged at desired positions in a desired direction” means that the magnetic flux application direction and the magnetic flux detection means are applied in the horizontal and vertical directions. Alternatively, a method in which the object to be detected is magnetized in an arbitrary direction using, for example, two cylindrical magnets arranged in an arbitrary direction such as an intermediate direction and using a magnetic field line that runs from one N pole to the other S pole. obtain. This method is characterized in that it can be easily realized by adding a magnet to a magnetic sensor of an existing banknote processing apparatus such as an ATM.
[0024]
The true / false determination device calculates the change in magnetic flux due to cancellation of the residual magnetic flux density and the bias magnetic field based on the detected voltage waveform obtained by measuring with a magnetic sensor. Different detection voltages and detection voltage waveforms can be obtained for each material, and a highly accurate discrimination calculation can be performed based on whether or not the shape of the desired detection voltage or detection voltage waveform is at a specified position. Further, for example, a well-known calculation method such as determination based on whether or not the detected detection voltage is similar to a matching pattern stored in advance may be used. The authenticity determination apparatus of the present invention is characterized in that highly accurate authenticity determination can be performed by such a method.
[0025]
The authenticity determination apparatus of the present invention is an authenticity determination apparatus for printed matter in which at least two kinds of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed at at least two different positions. A saturation magnetic field applying unit in which one or more permanent magnets or winding coils for applying a saturation magnetic field in an arbitrary direction to maintain a residual magnetic flux density are disposed at a desired position in a desired direction; A printed matter to which a magnetic field is applied is moved relative to the magnetic flux detection unit, and a bias magnetic field is applied to the printed matter moved to the magnetic flux detection unit in a direction different from the magnetic field direction of the saturation magnetic field application unit. A magnetic flux detection unit for detecting a magnetic flux change in the magnetic ink part, and a sensor unit comprising:
A position detection unit for detecting the position of the printed matter in which the magnetic flux change is detected;
An amplifier unit for performing amplification and waveform shaping of a detection signal of magnetic flux change output from the magnetic flux detection unit of the sensor unit;
A signal that has been amplified and waveform-shaped by the amplifier unit that has performed the waveform shaping is stored as magnetic data, a data storage unit that stores a position signal from the position detection unit, and the residual magnetic flux of the at least two types of magnetic inks At least 2 calculated based on a detected voltage waveform obtained by measuring a change in magnetic flux due to magnetic anisotropy in two directions, ie, a direction in which the density and the bias magnetic field are combined, measured by the magnetic flux detection unit of the magnetic sensor. The magnetic quality of each kind of magnetic ink and the correction position of the magnetic data are calculated based on the position signal from the position detection unit, and the prescribed positions of the printed matter of the at least two kinds of magnetic ink are stored in advance. A true / false determination unit that determines whether or not the magnetic quality of at least two types of magnetic ink on the genuine printed material matches the specified position;
A computer control unit that controls the data storage unit and the authenticity determination unit;
A result output unit for outputting a determination result as to whether or not magnetic ink having at least two different magnetic qualities from the authenticity determination unit is in a specified position;
A display unit for displaying a result of the result output unit;
It is characterized by comprising.
[0026]
The true / false discrimination device calculates based on the detected voltage waveform measured by the magnetic sensor, based on the change in magnetic flux due to the magnetic anisotropy in the so-called two-direction magnetic anisotropy. However, in the measurement method of the present invention, different detection voltages and detection voltage waveforms can be obtained for each magnetic material, and high-precision discrimination is performed based on whether or not the shape of the desired detection voltage waveform is at a specified position. There is a feature that can be operated. Further, for example, a well-known calculation method such as determination based on whether or not the detected detection voltage is similar to a matching pattern stored in advance may be used. The authenticity determination apparatus of the present invention is characterized in that highly accurate authenticity determination can be performed by such a method.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
There are two types of true / false determination methods of the present invention. One is that the magnetic flux (1) is held by the saturation magnetic field applying means, and then the residual magnetic flux density is reversed from the residual magnetic flux density held by the magnetic flux detecting means. This is a method of applying a bias magnetic field, and is hereinafter referred to as “a method of performing bias magnetization with a reverse polarity”. The other is a method of holding the residual magnetic flux density in the magnetic ink by the saturation magnetic field applying means, and then applying a bias magnetic field in a direction different from the residual magnetic flux density held by the magnetic flux detecting means. It is called a “magnetization method”. In addition, a description will be given together with a true / false discriminating apparatus that discriminates true / false of printed matter printed at at least two different positions with different residual magnetic flux densities when a saturation magnetic field is applied using these true / false discrimination methods.
[0028]
FIG. 1 is a diagram for explaining two kinds of authenticity determination methods according to the present invention. FIG. 1 (a) schematically shows a method of bias magnetizing in the reverse polarity. After applying a saturation magnetic field (5) to the magnetic ink (1) (the magnetic field direction is N pole on the left side and S pole on the right side) to maintain the residual magnetic flux density (3), the residual magnetic flux density ( A bias magnetic field (4) having a reverse polarity is applied to the magnetic ink (1) holding 3) (the magnetic field direction is the S pole on the left side and the N pole on the right side). At this time, by measuring with a magnetic sensor such as a ring-type head disposed in the magnetic flux detection means, a change in magnetic flux due to cancellation of the retained residual magnetic flux density (3) and the bias magnetic field (4) can be detected. That is, it is intended to detect the amount of residual magnetic flux remaining by measuring how much the magnetic flux remaining in the magnetic ink (1) is changed in the reverse direction by the bias magnetic field (4). is there.
[0029]
FIG. 1B is a schematic diagram showing a method of bias magnetization in different directions. The saturation magnetic field applying means applies a saturation magnetic field (5) to the magnetic ink (1) (the magnetic field direction is N pole on the upper side and lower side). After applying the S magnetic pole on the side to hold the residual magnetic flux density (3), the magnetic ink (1) holding the residual magnetic flux density (3) by the magnetic flux detection means is applied to the bias magnetic field (4) (magnetic field in a different direction). The direction is applied with the S pole on the left side and the N pole on the right side. At this time, when measured by a magnetic sensor such as a ring-type head installed in the magnetic flux detection means, it is possible to detect a change in magnetic flux due to the combination of the retained residual magnetic flux density (3) and the bias magnetic field (4). That is, it is intended to detect the amount of residual magnetic flux remaining by measuring how much the magnetic flux remaining in the magnetic ink (1) is changed in different directions by the bias magnetic field (4). is there.
[0030]
The printed matter of the present invention has a configuration in which printing is performed at at least two different positions with different residual densities when a saturation magnetic field capable of authenticity determination is applied.
[0031]
FIG. 2 explains the method of bias magnetizing in the reverse polarity described in FIG. 1A in the light of a hysteresis loop. The magnetic ink (A) and the magnetic ink (B) can obtain an equivalent detection voltage when measured with a normal magnetic sensor, but the residual magnetic flux density when a saturated magnetic field is applied is different. The printed matter on which the magnetic ink (A) and the magnetic ink (B) are printed at an arbitrary position is moved relative to the saturation magnetic field applying means and the magnetic flux detecting means, and the magnetic ink (A) on the printed matter is moved. When the portion reaches the saturation magnetic field applying means, the magnetic ink (A) is magnetized from the O point to the A1 point in the hysteresis loop by applying the Hm saturation magnetic field (if the magnetic ink has a residual magnetic flux density in advance). It is interpreted as being magnetized at point A1). Subsequently, when the portion of the magnetic ink (A) moves away from the saturation magnetic field applying means, it is released from the saturation magnetic field of Hm and moves from the A1 point to the B1 point on the curve, and the so-called residual magnetic flux density B1 is maintained. Is done. Subsequently, when the portion of the magnetic ink (A) further moves and reaches the magnetic flux detecting means, it moves to the point C1 because a bias magnetic field -Hm having a reverse polarity is applied. At the same time, when measured with a magnetic sensor such as a ring-type head, the amount of change in magnetic flux at point C1 can be detected.
[0032]
The relative movement means that the printed matter may be moved or the apparatus side may be moved.
[0033]
On the other hand, in the case of the magnetic ink (B) on the printed matter, similarly to the magnetic ink (A) described above, the hysteresis loop moves from the point A2 to the point B2 to the point C2.
[0034]
Comparing the two magnetic inks, the magnetic ink (B) has a loop inside the magnetic ink (A), so the magnetic flux density held at the C2 point is smaller than that at the C1 point. Discrimination is possible by measuring two magnetic inks with a magnetic sensor such as a ring-type head.
[0035]
As described above, in the measurement by the authenticity determination method and apparatus of the present invention, the magnetic material is subjected to the measurement by applying the bias magnetic field having the reverse polarity after the saturation magnetic field applying means gives the residual magnetic flux density to the magnetic ink. The residual magnetic flux density and the magnetic permeability can be taken into account, thereby making it possible to discriminate by detecting the magnetic quality.
[0036]
In contrast to the measurement by the authenticity determination method and apparatus according to the present invention described in detail above, in a known measurement method using a magnetic sensor, measurement is performed by applying a weak magnetic field strength H, so that it is in the vicinity of the point O in FIG. It is only possible to detect the amount of change (ΔB / ΔH) in the magnetic permeability μ, and not the magnetic quality.
[0037]
As described above, of the two kinds of authenticity determination methods of the present invention, the method of bias magnetizing in the reverse polarity has been described in the light of the hysteresis loop, but the same principle applies to another method of bias magnetizing in different directions. It has become. The difference is that the saturation magnetic field applying means applies a saturation magnetic field not in the horizontal direction as shown in FIG. 1A but in the vertical direction as shown in FIG. When a bias magnetic field is applied in the horizontal direction after maintaining the density, it becomes possible to detect a vector-like combination of the residual magnetic flux in the vertical direction and the ease of magnetization in the horizontal direction, and so-called magnetic anisotropy can also be detected. it can.
In addition, the direction which applies a saturation magnetic field is not limited to the direction shown to Fig.1 (a) and (b), Other directions can also be taken.
[0038]
Next, the present invention will be described in more detail by showing specific examples.
(Example) FIG. 3: is a document (7) which shows an example of the printed matter of this invention, and is a top view and typical sectional drawing. In this embodiment, two types of magnetic materials having different magnetic properties were selected: ferrite powder and soft magnetic stainless powder. The properties of the ferrite powder include a saturation magnetic flux density of about 80 emu / g, a holding power of about 40 Oe, and an average particle size of 4.5 to 6.5 μm. The soft magnetic stainless steel powder is characterized by a flake shape with a saturation magnetic flux density of about 124 emu / g, a coercive force of about 29 Oe, and an average particle size of about 4 μm.
[0039]
These two kinds of magnetic materials were blended in varnish or the like (without specifying details), and each magnetic ink was prepared based on a known ink preparation method. Hereinafter, an ink using ferrite powder is called a ferrite powder magnetic ink, and an ink using soft magnetic stainless steel powder is called a stainless powder magnetic ink. The blending ratio of the magnetic material in the ink was 15 weight% for the ferrite powder magnetic ink (9) and 3 weight% for the stainless powder magnetic ink (10). The reason why these blending ratios are different is to adjust the ink so that the detection voltage is obtained to the same extent in the known measurement method using a ring-type head, and to compare the known measurement method with the measurement method of the present invention. It is.
[0040]
FIG. 3 is a document (7) obtained by printing on fine paper (8) using the two types of magnetic inks. The printing method is an intaglio printing method that can transfer a large amount of ink. The letter “M” is ferrite powder magnetic ink (9) and the letter “N” is stainless steel magnetic ink (10). Each magnetic ink was applied with a line height of about 30 μm.
[0041]
FIG. 4 shows an embodiment of a true / false discrimination apparatus for discriminating printed matter by the printed matter authenticity judging method of the present invention. This authenticity determination device includes a sensor unit (11), a position detection unit (12), an amplifier unit (13), a control unit (14) for authenticity determination, a result output unit (15), and a display unit (16). It is composed of
The sensor unit (11) is composed of two permanent magnets and a ring type head, and forms a bias magnetic field in the horizontal direction with the permanent magnet and detects a change in magnetic flux with the ring type head.
The position detection unit (12) is a device that detects the position of a document, and can accurately specify the scanning position of the magnetic sensor.
The amplifier unit (13) performs amplification and waveform shaping of the detection signal output from the sensor unit.
The control unit (14) includes a data storage unit (17) and a true / false determination unit (18). The data storage unit (17) stores a signal from the magnetic sensor as magnetic data, and the true / false determination unit (18). Indicates whether or not the ferrite magnetic ink (9) and the stainless steel magnetic ink (10) are in the prescribed positions of the document (7) by correcting the misalignment of the magnetic data on the basis of the signal from the position detector (12). Determine whether.
The result output unit (15) outputs the determination result from the authenticity determination unit (18).
The display unit (16) displays the result of the result output unit (15).
[0042]
FIG. 5 shows the configuration of the sensor unit of the authenticity determination apparatus of the present invention. In FIG. 5 (a), the saturation magnetic field application unit (19) is transported with a neodymium magnet (20) having an outer diameter of 8 mm × 5 mm and a magnetic force of 0.4 T, with the N pole surface facing the document (7). The distance from the coming document (7) was set to 0.5 mm. The magnetic flux detection part (21) was comprised with the ring type head (23) and the two ferrite magnets (22). The ring-type head (23) was installed so as to be in light contact with the document (7) using a general one used in a vending machine or the like. In order to obtain the bias magnetic field (4) of the magnetic flux detector (21), two ferrite magnets (22) having an outer dimension of 10 mm in length, 3 mm in width, 2 mm in thickness, and a magnetic force of 0.06 T were installed. As shown in FIG. 5 (b), the direction of the magnetic pole was directed to the S pole before the document (7) was conveyed, but this arrangement was held in the document (7) immediately below the ring-type head (23). It was devised so that the magnetic flux can be applied in a direction different from the residual magnetic flux.
[0043]
Moreover, although the distance between the saturation magnetic field application unit (19) and the magnetic flux detection unit (21) is 40 mm, the neodymium magnet (20) of the saturation magnetic field application unit (19) is used for detection of the magnetic flux detection unit (21). The distance should not be affected. Note that the neodymium magnet (20), the ferrite magnet (22), and the ring-type head (23) shown in FIG.
[0044]
FIG. 6 shows a result when the document (7) is moved at a conveyance speed of 1 m / sec. FIG. 6A shows a waveform of a detection voltage obtained by measuring the document prepared in FIG. 3 with the authenticity discrimination device of the present invention, and FIG. 6B shows a general case where a DC bias magnetic field is applied to the same document. 3 shows a waveform of a detection voltage when measured by a measuring method of a simple ring type head. FIG. 6 (a) shows the measurement result of moving the document (7) at a conveyance speed of 1 m / sec. The detection voltage of the stainless steel powder magnetic ink was lower than that of the ferrite powder magnetic ink. .
[0045]
This will be described with reference to the hysteresis loop shown in FIG. When the document (7) reaches the saturation magnetic field applying means, a saturation magnetic field (5) of 0.4 T is applied by the neodymium magnet, and two types of magnetic inks, ferrite powder magnetic ink and stainless steel magnetic ink, have an O point on the hysteresis loop. To A1 and A2. When the document (7) moves and is released from the magnetic force of the neodymium magnet, the residual magnetic flux densities B1 and B2 in the vertical direction are maintained. When it further moves and reaches the magnetic flux detection means, a horizontal bias magnetic field (4) of 0.06 T is applied by the ferrite magnet, and moves to C1 and C2 on the loop, respectively. At this time, by measuring with a ring type head while applying a bias magnetic field (4), the amount of change in the magnetic flux of C1 and C2 can be detected. Looking at the magnetic flux density, the ferrite powder magnetic ink is Bc1, whereas the stainless steel magnetic ink is Bc2, and the magnetic flux density is small. The result is shown in the waveform of the detection voltage in FIG.
[0046]
The waveform of the document (7) shown in FIG. 6 (a) detected by the sensor unit (11) of the authenticity discrimination device of FIG. 4 is amplified and shaped by the amplifier unit (13), and is also necessary. In this case, the noise component is removed by a circuit filter and stored as magnetic data in the control unit (14). On the other hand, it is input as a position signal from the rotary encoder which is the position detection section (12) to the control section. The control unit (14) can accurately determine the scanning position of the document (7) based on the magnetic data and the position signal and perform a true / false determination operation, and the magnetic ink of the ferrite powder or the stainless steel powder can be detected at the specified position. In this case, an intrinsic signal is sent to the result output unit (15). Note that the amplifier unit (11), the control unit (14), the result output unit (15), and the display unit (16) of the authenticity determination device may use known circuits and algorithms.
[0047]
【The invention's effect】
As described in detail above, according to the present invention, the residual magnetic flux is applied to the printed ink on the printed matter, and then the magnetic flux is detected by a general magnetic sensor while applying a DC bias magnetic field in a different direction. Therefore, it is possible to detect the magnetic quality in consideration of the residual magnetic flux density and the magnetic permeability, and an extremely high authenticity determination can be performed.
[0048]
Further, according to the printed matter authenticity determination method of the present invention, the residual magnetic flux density is held in the magnetic ink portion by the saturation magnetic field applying means provided on the upstream side of the conveyance, and the residual magnetic flux density is provided by the magnetic flux detecting means provided on the downstream side. Since a magnetic field is detected by applying a bias magnetic field with an appropriate polarity to the opposite polarity, the magnetic material is detected by canceling the residual magnetic flux and the bias magnetic field due to the difference in the hysteresis loop that is the magnetic characteristic of the magnetic material. Different detection voltages and detection voltage waveforms are determined for each property, and based on the detection voltage value and the detection waveform shape, it is determined whether at least two types of magnetic materials have a desired magnetic ink at a desired position. Authenticity discrimination can be performed.
[0049]
The authenticity discrimination device of the present invention is based on a detected voltage waveform measured by a magnetic sensor based on a change in magnetic flux due to a magnetic anisotropy in two directions, ie, a direction in which a residual magnetic flux density and a bias magnetic field are combined. In the measurement method of the present invention, a different detection voltage and detection voltage waveform are obtained for each magnetic material, and a high value is obtained based on whether or not the shape of the desired detection voltage waveform is at a specified position. Accurate discrimination calculation can be performed, and generally known calculation methods can be used. The authenticity determination apparatus of the present invention is characterized in that highly accurate authenticity determination can be performed by such a method.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of two types of authenticity determination methods of the present invention.
FIG. 2 is a diagram illustrating a hysteresis loop for the method of bias magnetizing in the reverse polarity described in FIG.
FIG. 3 shows an embodiment of the magnetic printed material of the present invention.
FIG. 4 shows an embodiment of the authenticity determination device of the present invention.
FIG. 5 shows a configuration of a sensor unit of the authenticity determination device of the present invention.
FIG. 6 shows the results when the printed material of the present invention is moved at a conveyance speed of 1 m / sec.
FIG. 7 shows a hysteresis loop.
[Explanation of symbols]
1 Magnetic ink
2 Magnet
3 Residual magnetic flux density
4 Bias magnetic field
5 saturation magnetic field
6 magnetic domains
7 Documents
8 fine paper
9 Ferrite powder magnetic ink
10 Stainless steel magnetic ink
11 Sensor part
12 Position detector
13 Amplifier section
14 Control unit
15 Result output section
16 Display section
17 Data storage
18 Authenticity determination unit
19 Saturation magnetic field application section
20 Neodymium magnet
21 Magnetic flux detector
22 Ferrite magnet
23 Ring-type head
24 Hysteresis curve of ferrite powder magnetic ink
25 Hysteresis curve of stainless steel magnetic ink

Claims

A printed matter in which at least two kinds of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed on at least two different positions on a substrate,
At the time of authenticity determination, a saturation magnetic field is applied by a saturation magnetic field application unit to a magnetic ink portion at a different position in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved to a magnetic flux detection unit, a bias magnetic field having a polarity opposite to the polarity of the residual magnetic flux density is applied, and the at least two kinds of magnetic inks respectively hold the printed matter. Changes in the magnetic flux due to cancellation of the residual magnetic flux and the bias magnetic field are detected, and from the detected waveforms, at least two types of magnetic ink are likely to remain in the residual magnetic flux direction and are easy to be magnetized in the bias magnetic field direction. And the difference in magnetic quality of the at least two types of magnetic ink is detected, and the position of at least two types of magnetic ink on the printed matter in which the change in magnetic flux is detected by the position detection unit is detected and stored in advance. The difference between the magnetic properties of at least two types of magnetic ink on a genuine printed product and the specified position must be verified to determine whether it is true or false. Printed materials and features.

A printed matter in which at least two kinds of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed on at least two different positions on a substrate,
At the time of authenticity determination, a saturation magnetic field is applied by a saturation magnetic field application unit to a magnetic ink portion at a different position in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved to the magnetic flux detection unit, and a bias magnetic field is applied in a direction different from the polarity of the residual magnetic flux density, so that the at least two types of magnetic ink are held respectively. A change in magnetic flux due to magnetic anisotropy in two directions obtained by synthesizing the residual magnetic flux and the bias magnetic field is detected. Ease of remaining in the residual magnetic flux direction of at least two types of magnetic ink from the detected waveform and bias At least two types of magnetic inks in the printed matter, which are read for ease of magnetization in the magnetic field direction, the difference in magnetic quality of the at least two types of magnetic inks is detected, and the change of the magnetic flux is detected by the position detection unit The position of the ink is detected and the difference between the magnetic properties of at least two types of magnetic ink on the genuine print stored in advance is compared with the specified position. It is in the printed matter which is a possible authenticity discrimination.

A method for determining the authenticity of a printed matter in which at least two types of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed on at least two different positions on a substrate,
A saturation magnetic field application unit applies a saturation magnetic field to magnetic ink portions at different positions in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved relatively to the magnetic flux detection unit, and a bias magnetic field having a polarity opposite to the polarity of the residual magnetic flux density is applied to the printed matter to which the saturation magnetic field is applied by the magnetic flux detection unit. Thereby causing cancellation of the retained magnetic flux and the bias magnetic field, and detecting a change in magnetic flux due to the cancellation,
From the detected waveform, read the easiness of at least two types of magnetic ink to remain in the residual magnetic flux direction and the ease of magnetization in the direction of the bias magnetic field, and detect the difference in magnetic quality of the at least two types of magnetic ink. In addition, the position detection unit detects the position of at least two types of magnetic ink on the printed matter in which the change in magnetic flux is detected, and the difference in magnetic quality between at least two types of magnetic ink on the genuine printed matter that is stored in advance. A method for determining the authenticity of a printed matter, wherein the authenticity is determined by collating with a specified position.

A method for determining the authenticity of a printed matter in which at least two types of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed on at least two different positions on a substrate,
A saturation magnetic field application unit applies a saturation magnetic field to magnetic ink portions at different positions in at least two places of the printed matter to maintain a residual magnetic flux density,
The printed matter to which the saturation magnetic field is applied is moved relatively to the magnetic detection unit, and a bias magnetic field is applied to the printed matter to which the saturation magnetic field is applied in a direction different from the polarity of the residual magnetic flux density by the magnetic flux detection unit. By generating a magnetic anisotropy in two directions by combining the residual magnetic flux and the bias magnetic field that are held, a change in magnetic flux due to the magnetic anisotropy in the two directions is detected,
From the detected waveform, read the easiness of at least two types of magnetic ink to remain in the residual magnetic flux direction and the ease of magnetization in the direction of the bias magnetic field, and detect the difference in magnetic quality of the at least two types of magnetic ink. In addition, the position detection unit detects the position of at least two types of magnetic ink on the printed matter in which the change in magnetic flux is detected, and the difference in magnetic quality between at least two types of magnetic ink on the genuine printed matter that is stored in advance. A method for determining the authenticity of a printed matter, wherein the authenticity is determined by collating with a specified position.

A device for determining the authenticity of a printed matter in which at least two types of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed at at least two different positions,
A saturation magnetic field application unit in which one or more permanent magnets or winding coils for applying a saturation magnetic field in an arbitrary direction and maintaining a residual magnetic flux density to the printed matter are arranged in a desired direction at an arbitrary position; A printed matter to which a saturation magnetic field is applied is moved relative to the magnetic flux detection unit, and a bias magnetic field having a polarity opposite to the magnetic field direction of the saturation magnetic field application unit is applied to the printed matter that has moved to the magnetic flux detection unit. A magnetic flux detector for detecting a magnetic flux change in the magnetic ink portion of
A position detection unit for detecting the position of the printed matter in which the magnetic flux change is detected;
An amplifier unit for performing amplification and waveform shaping of a detection signal of magnetic flux change output from the magnetic flux detection unit of the sensor unit;
A signal that has been amplified and waveform-shaped by the amplifier unit that has performed the waveform shaping is stored as magnetic data, a data storage unit that stores a position signal from the position detection unit, and the residual magnetic flux of the at least two types of magnetic inks The magnetic quality of at least two types of magnetic inks calculated based on the detected voltage waveform obtained by measuring the change in magnetic flux due to cancellation of the density and the bias magnetic field with the magnetic flux detection unit of the magnetic sensor, and The correction of the positional deviation of the magnetic data is calculated on the basis of the position signal from the position detection unit, and the specified positions of the at least two types of magnetic ink printed matter are at least two on the genuine printed matter stored in advance. A true / false determination unit that determines whether or not the magnetic quality of the type of magnetic ink and the specified position match each other;
A computer control unit that controls the data storage unit and the authenticity determination unit;
A result output unit for outputting a determination result as to whether or not magnetic ink having at least two different magnetic qualities from the authenticity determination unit is in a specified position;
An apparatus for determining authenticity of printed matter, comprising: a display unit that displays a result of the result output unit.

A device for determining the authenticity of a printed matter in which at least two types of magnetic inks having different residual magnetic flux densities when a saturation magnetic field is applied are printed at at least two different positions,
A saturation magnetic field application unit in which one or more permanent magnets or winding coils for applying a saturation magnetic field in an arbitrary direction to maintain a residual magnetic flux density are arranged in a desired position in a desired direction on the printed matter; A bias magnetic field is applied in a direction different from the magnetic field direction of the saturation magnetic field application unit to the printed material moved to the magnetic flux detection unit by moving the printed material applied with the saturation magnetic field relatively to the magnetic flux detection unit. A sensor unit comprising a magnetic flux detection unit for detecting a magnetic flux change in two types of magnetic ink parts;
A position detection unit for detecting the position of the printed matter in which the magnetic flux change is detected;
An amplifier unit for performing amplification and waveform shaping of a detection signal of magnetic flux change output from the magnetic flux detection unit of the sensor unit;
A signal that has been amplified and waveform-shaped by the amplifier unit that has performed the waveform shaping is stored as magnetic data, a data storage unit that stores a position signal from the position detection unit, and the residual magnetic flux of the at least two types of magnetic inks At least 2 calculated based on a detected voltage waveform obtained by measuring a change in magnetic flux due to magnetic anisotropy in two directions, ie, a direction in which the density and the bias magnetic field are combined, measured by the magnetic flux detection unit of the magnetic sensor. The magnetic quality of each kind of magnetic ink and the correction position of the magnetic data are calculated based on the position signal from the position detection unit, and the prescribed positions of the printed matter of the at least two kinds of magnetic ink are stored in advance. A true / false determination unit that determines whether or not the magnetic quality of at least two types of magnetic ink on the genuine printed material matches the specified position;
A computer control unit that controls the data storage unit and the authenticity determination unit;
A result output unit for outputting a determination result as to whether or not magnetic ink having at least two different magnetic qualities from the authenticity determination unit is in a specified position;
An apparatus for determining authenticity of printed matter, comprising: a display unit that displays a result of the result output unit.