JP3862848B2

JP3862848B2 - Detected object whose authenticity is to be checked, and processing apparatus and check method for checking the authenticity of the detected object

Info

Publication number: JP3862848B2
Application number: JP03625798A
Authority: JP
Inventors: 実小宮; 逸雄竹内; 達也栗原; 俊哉森
Original assignee: NHK Spring Co Ltd
Current assignee: NHK Spring Co Ltd
Priority date: 1998-02-18
Filing date: 1998-02-18
Publication date: 2006-12-27
Anticipated expiration: 2018-02-18
Also published as: JPH11232419A

Description

【０００１】
【発明の属する技術分野】
この発明は、クレジットカード，ＩＤカード，ＣＤカード等のカード類，パスポート，重要書類や有価証券，紙幣および小切手等の金券，トラベラーズチェック，あるいは絵画等の美術品，競艇・競馬等の公営競技投票券等のように、偽造を防止する必要がありかつ真正さがチェックされる被検出物と、そのチェック装置およびチェック方法に関する。
【０００２】
【従来の技術】
各種カードや書類等の真正さをチェックするための手段として、例えば特開昭５０−６９９９号公報や特開平６−１７９２９６号公報あるいは特開平７−３２７７７号公報などに記載されているように、被検出物の走査領域に照合用データを登録しておくものが知られている。この種の被検出物は、真正さをチェックする際に前記走査領域をセンサによって走査し、得られた検出信号と前記照合用データを照合するようにしている。
【０００３】
前記公知例において、被検出物の走査領域を走査するための処理装置は、予め決められた一定速度で被検出物の走査領域を読取ることを条件とし、得られた検出信号を時分割してディジタルコード化したのち、予め登録されている照合用データと比較することにより、この被検出物が真正であるか否かをチェックしている。このため従来の処理装置では、搬送速度を制御可能な電気モータによって駆動されるローラ等の搬送機構により、被検出物を一定速度で走査方向に移動させながら、センサによるデータの読取りを行なっている。
【０００４】
【発明が解決しようとする課題】
前述の従来の処理装置は、モータ等の搬送機構を用いる分だけ装置が複雑化するとともに部品点数も多くなり、装置が大形化および高コスト化していた。また従来の処理装置はメンテナンス性がよくないなど、改善の余地があった。このため、被検出物を手動で移動させることも考えられた。
【０００５】
しかし、被検出物を手動で搬送する場合、走査速度が一定にならないため、センサの出力波形が走査速度に応じて変化してしまうという問題がある。このため同じ被検出物でありながら、チェックするたびに出力波形が異なることになり、高精度なチェックを行うことができない。
【０００６】
そこで例えばローラエンコーダなどを用いることにより、被検出物の移動量に応じた同期クロック信号を検出し、この同期クロック信号に応じて出力波形の時間的補正を行うことにより、走査速度が変動しても同一の被検出物からはほぼ同一の検出信号が得られるようにすることも考えられた。しかしながらその場合、同期クロックをとるためのローラと被検出物との間の滑り等によって検出誤差を生じ、高精度のチェックを行うことができないおそれがある。しかもその場合には、ローラエンコーダ等の余分な部品を処理装置に組込む必要があるため、コストを下げる上で、また小形化を図る上で十分とはいえない。
【０００７】
従って本発明の目的は、チェックの精度を下げることなく処理装置の簡略化と小形化等が図れるような被検出物とそのチェック装置およびチェック方法を提供することにある。
【０００８】
【課題を解決するための手段】
前記の目的を果たすための本発明の被検出物は、被検出物の表面などに位置信号を得るための領域（位置信号記録部）を設け、素子走査部を走査する際にこの位置信号記録部も同時に走査し、得られた位置信号（同期クロック信号）にもとづき、素子走査部の検出信号を常に同じ条件で得るようにしたものである。
【０００９】
すなわち本発明の被検出物は、磁性材料からなる基材と、前記基材中にランダムに混入された多数の磁性素子を含みかつ前記基材の所定位置に設定された素子走査部と、前記素子走査部の磁性素子の混入状況に応じて得られる固有の出力に関する照合用データがコード化されて記録される登録データ記録部と、前記素子走査部をセンサによって走査する際に前記素子走査部の位置に関する信号を出力可能な位置信号記録部とを具備し、前記素子走査部と前記位置信号記録部が共通トラック領域に設けられ、該共通トラック領域では前記位置信号記録部が前記素子走査部に重なった状態で前記素子走査部の走査方向に延び、前記位置信号記録部は、前記走査方向に磁化の方向が交互に変化しかつ走査方向と直交する方向に磁化の方向が同じとなるよう着磁されている。
【００１０】
位置信号記録部は、例えば公知の高保磁力の磁性層を被検出物の一部に設けたものとか、磁気インクによって所定のパターンで印刷したもの、あるいはバーコードのように光学的に読取ることの可能な記録媒体によって同期クロック信号を出力できるようにしたものでもよい。
【００１２】
本発明の処理装置は、前記素子走査部を磁気的に走査することによりこの素子走査部に含まれる磁性素子の分布に応じた出力をとらえて固有の検出信号を得る第１のセンサ部と、前記素子走査部に対する前記第１のセンサ部の位置に応じた信号を出力可能な位置信号記録部を走査することによって同期クロック信号を得る第２のセンサ部と、前記第１のセンサ部がとらえた出力と前記同期クロック信号とに基いて得られた検出信号を、被検出物の登録データ記録部に登録されているデータと照合し、両者が対応した時にこの被検出物が真正であると判断する手段とを具備し、前記第１のセンサ部は、走査時に一対の磁電変換素子が前記位置信号記録部の位置信号を同時に検出できるよう前記走査方向に関して直交する方向に前記磁電変換素子対を配置し、前記第２のセンサ部は、走査時に一対の磁電変換素子が前記位置信号を時間的にずれて検出できるよう前記走査方向に関して前後方向に前記磁電変換素子対を配置し、これら第１のセンサ部と第２のセンサ部を共通の検出ヘッドに配置し、被検出物の共通トラック領域に設けた前記素子走査部と位置信号記録部とを前記検出ヘッドによって走査するようにしている。
【００１４】
位置信号記録部を走査する第２のセンサ部としては、ＭＲ素子等の磁電変換素子あるいは記録・読取り用磁気ヘッドのように位置信号記録部を磁気的に読取るものを採用できる。位置信号記録部がバーコードのように光学的な記録媒体を利用したものである場合には、被検出物に印刷されたパターンを光学的に読取る方法、あるいは、磁気インクを用いた印刷パターンを磁気的に検出する方法なども採用できる。
【００１５】
この発明のチェック方法は、前記第１のセンサ部の前記磁電変換素子対によって前記素子走査部と前記位置信号記録部を同時に磁気的に走査することにより前記磁性素子の分布に応じた固有の出力を得る工程と、前記被検出物に設けた位置信号記録部と前記素子走査部を前記第２のセンサ部の前記磁電変換素子対によって同時に走査することにより素子走査部の位置に応じた同期クロック信号を得る工程と、前記第１のセンサ部がとらえた前記出力と第２のセンサ部によって得られた同期クロック信号とに基いて走査速度に依存しない素子走査部の検出信号を得る工程と、前記検出信号と被検出物の登録データ記録部に記録されているデータとを照合し、両者が対応した時にこの被検出物が真正であると判断する工程とを含んでいる。
【００１６】
【発明の実施の形態】
以下に本発明の第１の実施形態について図１から図３を参照して説明する。
図１に示されるように、カードあるいは書類（紙葉）等の形態をとる被検出物１０は、紙あるいは合成樹脂等の非磁性材を主体とする基材１１からなり、後述するように、被検出物１０の特徴を表わす素子走査部１２と、この被検出物１０をチェックする際に同期クロック信号を得るための位置信号記録部１３と、登録データ記録部１４などを有している。
【００１７】
素子走査部１２は、基材１１中に多数の細かな磁性素子２０をランダムに混入したものである。磁性素子２０の形態の一例は、高分子材料からなる繊維状の素子本体に磁性金属の粉体を混入したもの（いわゆる磁性ポリマー素子）であり、各磁性素子２０はそれぞれ不特定多数の方向を向いている。これらの磁性素子２０は、被検出物１０のほぼ全体にわたって分布していてもよい。磁性素子２０の素子本体に使われる高分子材料の一例は、ポリエチレンやポリエステルあるいはウレタンなどであるが、要するに適当な可撓性を有する周知の合成樹脂を適用できる。
【００１８】
磁性素子２０に使われる磁性金属としては、例えばパーマロイ，センダスト，Ｃｏ系アモルファス，ソフトフェライトなどのように磁気的に軟質な高透磁率磁性材料が適しているが、例えばフェライトやＳｍ−Ｃｏ合金，Ｎｄ合金等のように磁気的に硬質な高保磁力材料が使われてもよい。磁性素子２０の形態は繊維状以外に、フレーク，粉体，箔，ワイヤ等であってもよい。
【００１９】
位置信号記録部１３の一例は、高保磁力の磁性材からなる磁性層を用いた帯状の磁気ストライプであり、例えば被検出物１０の走査方向（矢印Ｆで示す方向）に磁化の方向が所定ピッチで逆転するような磁化パターンで着磁されている。この実施形態の場合、素子走査部１２と位置信号記録部１３との相互の影響を少なくするために、素子走査部１２と位置信号記録部１３とを、互いに距離ｄだけ離して平行に設けている。
【００２０】
位置信号記録部１３は、後述するように被検出物１０をチェックする際に下記処理装置３０の検出部（検出ヘッド）３１によって素子走査部１２と同時に走査され、位置信号記録部１３から得られる出力を同期クロック信号として素子走査部１２の検出信号に反映させるようにしている。
【００２１】
登録データ記録部１４には、素子走査部１２を走査することによって得られる固有の情報、すなわち磁性素子２０の分布状態等に応じて特徴付けられた固有の情報（照合用データ）が、下記の処理装置３０によって暗号化されて書込まれるようになっている。この登録データ記録部１４には、照合用データ以外に、各種の情報（例えばプリペイドカードの場合は額面や残額等）も磁気的あるいは光学的手段もしくはＩＣチップ等の記録媒体によって記録されてもよい。なお登録データ記録部１４は、被検出物１０とは別体の電子機器の記憶領域（例えばホストコンピュータのメモリ）に記録するようにしてもよい。
【００２２】
図３に示された処理装置３０は、被検出物１０をチェックする際に、被検出物１０をその移動経路３０ａに沿って矢印Ｆで示す走査方向に移動させるようにしている。被検出物１０の移動経路３０ａの途中に検出ヘッドとしての検出部３１が設けられている。図２に示す検出部３１の一例は、素子走査部１２を走査するための第１のセンサ部３２と、位置信号記録部１３を検出するための第２のセンサ部３３を備えている。
【００２３】
第１のセンサ部３２は、出力の大きさが走査速度に依存しない磁電変換素子の一例としての一対のＭＲ素子（磁気抵抗効果素子対）４０，４１を備えている。ＭＲ素子４０，４１の背後にマグネット４２（図３に示す）が配置されている。ＭＲ素子４０，４１は磁界の強さに応じて電気抵抗値が変化する特性を有し、これらＭＲ素子４０，４１は互いに電気的に接続され、かつ、各ＭＲ素子４０，４１にマグネット４２による同じ強さの磁界が及ぶようになっている。一方のＭＲ素子４０は直流電源４３に接続され、他方のＭＲ素子４１はマイクロコンピュータ等を用いた演算処理照合部４５に接続されている。
【００２４】
素子走査部１２を走査する際に、ＭＲ素子４０，４１の近傍を磁性素子２０が通ると、磁性素子２０の位置に応じてＭＲ素子４０，４１を通る磁束が経時的に変化し、ＭＲ素子４０，４１の抵抗値に差が出るためＭＲ素子４０，４１の出力電圧が変化するようになる。この出力電圧は、素子走査部１２に混入している磁性素子２０の分布密度や磁性素子２０のサイズ等に応じて微妙に変化するので、この被検出物１０に固有の出力電圧の波形が得られる。
【００２５】
第２のセンサ部３３は、位置信号記録部１４に記録されている同期クロック信号（位置信号）を読取ることの可能な磁気ヘッド、または第１のセンサ部３２と同様のＭＲ素子対を備えている。
【００２６】
処理装置３０は、登録データ記録部１４に記録されたデータを読取るためのコード読取り部５５を備えている。コード読取り部５５は、読取り用の回路５６に接続されている。演算処理照合部４５は、検出された信号を処理するためのＡ／Ｄ変換器６０や比較器６１および暗号コード変換器６２などを含んでいる。演算処理照合部４５に、チェック結果等を示す表示器６３が接続されている。
【００２７】
次に、前記被検出物１０の発行処理と、真正さを判断するためのチェック工程などについて説明する。
被検出物１０が製造される際に、基材１１中に磁性素子２０が混入される。磁性素子１２は少なくとも素子走査部１２に混入されるが、場合によっては被検出物１０の全体に混入してもよい。また被検出物１０に高保磁力の磁性層からなる帯状の位置信号記録部１３と登録データ記録部１４を形成する。
【００２８】
そして被検出物１０の発行処理において、前記検出部３１と同様のＭＲ素子対を用いた検出部によって素子走査部１２が所定速度で走査され、その出力電圧の波形が特定のアルゴリズムによって暗号化されて登録データ記録部１４に記録される。この実施形態の登録データ記録部１４は磁気帯であるが、光学的に読取り可能な標識（例えばバーコードや二次元バーコード，ＯＣＲ文字など）を、印字ヘッドによって登録データ記録部１４に記録してもよいし、磁気インクを用いてもよく、あるいはコードを記録したホログラムを暗号コードにしたがって順番にスタンプしてもよい。
【００２９】
また、素子走査部１２を検出部によって走査する際に素子走査部１２の位置に応じた同期クロック信号を得るために、磁気ヘッド等によって位置信号記録部１３の着磁がなされる。例えば図６に示す位置信号記録部１３のように、走査方向Ｆに沿って一定の間隔で磁化方向が交互に反転するように着磁がなされる。
【００３０】
被検出物１０が真正であるか否かのチェックは前記処理装置３０によって行われる。この被検出物１０を処理装置３０に挿入し、その移動経路３０ａに沿って被検出物１０を走査方向Ｆに移動させる。そのとき、第１のセンサ部３２によって素子走査部１２を走査するとともに、第２のセンサ部３３によって位置信号記録部１３を走査する。
【００３１】
第１のセンサ部３２によって素子走査部１２が走査されると、素子走査部１２に含まれる磁性素子２０がＭＲ素子４０，４１の近傍を順次通過する。この時に磁性素子２０の位置や分布状況等に応じてＭＲ素子４０，４１を通る磁束が経時的に変化するため、この素子走査部１２に固有の電圧波形が出力される。この波形は、第２のセンサ部３３によって検出された位置信号記録部１３の同期クロック信号に基いて時分割され、分割された微小部分ごとに出力電圧が複数段階にランク付けされてディジタル化される。こうして、走査速度に依存しない素子走査部１２の検出信号が得られる。この検出信号を、暗号コード変換器６２によって特定のアルゴリズムに従って復号する。
【００３２】
また、登録データ記録部１４に記録されている照合用データがコード読取り部５５によって読取られる。この照合用データが、比較器６１によって前記復号された素子走査部１２の検出信号と比較され、両者が整合した時に、この被検出物１０が本物であると判断され、その照合結果が表示器６３に表示される。
【００３３】
このように、第１のセンサ部３２によって得られる素子走査部１２の検出信号を、第２のセンサ部３３によって得られる同期クロック信号（位置検出信号）に基いて時分割することにより、被検出物１０の移動速度が一定でなくても常に同じ条件で素子走査部１２を検出することが可能となる。このため、手動による不安定な移動速度でも高精度でデータの照合を行うことができ、モータ等を用いた搬送機構や、ローラエンコーダ等の時間補正手段を用いずとも、簡単な構成の処理装置３０によって精度の高い真偽判定を実現できる。なお、処理装置３０はモータによって駆動される搬送機構を備えていても差し支えない。
【００３４】
次にこの発明の第２の実施形態について、図４から図７を参照して説明する。この実施形態の被検出物１０は、図４に示すように、素子走査部１２と位置信号記録部１３とを実質的に同一のトラック領域に設けることにより、前記処理装置３０のさらなる構成の簡略化と小形化，軽量化を実現できるようにしている。
【００３５】
この被検出物１０の真偽を判定するための処理装置の検出部３１は、図５等に示すように、共通の検出ヘッド７０に配置された第１のセンサ部３２と第２のセンサ部３３とを備えている。
【００３６】
第１のセンサ部３２は、前記実施形態で述べたものと同様の一対のＭＲ素子４０，４１を、走査方向Ｆに関して直交する方向、すなわち走査時に位置信号記録部１３の位置信号を同時に検出可能な位置に設けている。これに対し第２のセンサ部３３は、一対のＭＲ素子５０，５１を走査方向Ｆに関して互いに前後方向、すなわち走査時に位置信号記録部１３の位置信号を時間的にずれて検出する位置にＭＲ素子５０，５１を設けている。
【００３７】
図６に示すように位置信号記録部１３は、走査方向Ｆに関して、矢印Ａ，Ｂで示すように磁化の方向が一定ピッチで交互に変化するように着磁されている。この実施形態の場合、１つの検出ヘッド７０に設けた各センサ部３２，３３によって、素子走査部１２と位置信号記録部１３を同時に走査する。
【００３８】
この場合、第１のセンサ部３２において各ＭＲ素子４０，４１に位置信号記録部１３の同一磁界がかかるため、位置信号記録部１３の信号（位置信号）が相殺される。このため第１のセンサ部３２においては位置信号記録部１３の信号は検出されない。しかしＭＲ素子４０，４１は素子走査部１２の磁束変化をとらえるため、素子走査部１２中の磁性素子２０の混入パターン等に応じて例えば図７に示すような出力波形Ｗ1 が検出される。
【００３９】
これに対し第２のセンサ部３３においては、ＭＲ素子５０，５１に位置信号記録部１３の互いに異なる磁界がかかるとともに、ＭＲ素子５０，５１が素子走査部１２の磁束変化もとらえる。このため第２のセンサ部３３においては、素子走査部１２中の磁性素子２０の混入パターン等に応じた出力波形と、位置信号記録部１３の出力波形（位置信号）との合成された波形が検出される。ここで、位置信号記録部１３の出力波形は素子走査部１２の出力波形Ｗ1 に比較して十分大きいため、合成された波形は、図７に示す波形Ｗ2 のように、実質的に位置信号記録部１３による波形とほぼ同等となる。
【００４０】
従って第２のセンサ部３３から出力される合成波形Ｗ2 から同期クロック信号を得て、第１のセンサ部３２の出力波形Ｗ1 を時分割する。これにより、第１のセンサ部３２から出力される磁性素子２０の分布状況に応じた検出信号を、走査速度にかかわらず同一条件で検出することが可能となる。
【００４１】
このように素子走査部１２と位置信号記録部１３とを同一トラックに設けることにより、処理装置３０の検出部３１が１つの検出ヘッド７０で済むため、処理装置３０の小形化と軽量化および低コスト化を図る上でさらに有利である。しかも素子走査部１２と位置信号記録部１３を被検出物１０の同一トラックに設けることにより、被検出物１０の小形化を図ることができる。また、素子走査部１２と位置信号記録部１３を同一トラックに設けた場合には、被検出物１０を走査する際に図４中の矢印Ｒで示す回転方向の位置ずれの影響を受けにくくなって、高精度にチェックできるという利点もある。
【００４２】
なお図８に示す検出部３１は、共通の検出ヘッド７０に設けた第１のセンサ部３２のＭＲ素子４０，４１を走査方向Ｆに関して横長の形状とした例である。図９に示す検出部３１は、第１のセンサ部３２のＭＲ素子４０，４１を走査方向Ｆに関して斜め方向に延びる形状とした例である。そして図１０に示す検出部３１は、第１のセンサ部３２のＭＲ素子４０，４１を走査方向Ｆに関して横向きのＶ形に配置した例である。
【００４３】
これらの実施形態は、いずれも、第１のセンサ部３２は、走査時に位置信号記録部１３の位置信号を同時に検出可能な位置に磁電変換素子対（ＭＲ素子４０，４１）を設けたものであり、第２のセンサ部３３は、走査時に前記位置信号を時間的にずれて検出する位置に磁電変換素子対（ＭＲ素子５０，５１）を設けたものである。このような形態のＭＲ素子４０，４１（図８，図９，図１０）を採用することにより、素子走査部１２および位置信号記録部１３との位置ずれの影響を受けにくい検出部３１にすることが可能であり、検出部３１のさらなる小形化も可能である。
【００４４】
図１１に示す被検出物１０の実施形態は、ＩＣカード８０の一部に前記素子走査部１２と位置信号記録部１３を設けるとともに登録データ記録部１４を設けた例である。それ以外の基本的な構成と作用は前記実施形態と同様であるため、前記実施形態と共通の箇所に共通の符号を付して説明は省略する。このＩＣカード８０も、前記実施形態と同様の検出部３１によって素子走査部１２と位置信号記録部１３を同時に走査し、位置信号記録部１３によって得られる同期クロック信号に基いて素子走査部１２の出力を時分割するとともに、演算処理照合部４５において登録データ記録部１４のデータとの照合を行う。
【００４５】
【発明の効果】
請求項１に記載した被検出物によれば、走査速度が変化しても高精度なチェックを行うことができ、ローラエンコーダを用いる場合に見られるような滑りによる精度低下の問題も生じないし、処理装置の構成も簡略化できる。
【００４６】
この被検出物によれば、素子走査部と位置信号記録部を共通トラックに設けることにより、被検出物の小形化を図る上で有利である。また、被検出物の位置ずれの影響を少なくすることができる。
【００４７】
請求項２に記載した処理装置によれば、モータ等を駆動源する搬送機構を用いることなく高精度なチェックを行うことができる。そして処理装置の構成が簡略化され、部品数も少なくてすみ、処理装置の小形化と低コスト化が図れる。この処理装置によれば、第１のセンサ部と第２のセンサ部を共通の検出ヘッドに設けることによって、処理装置のさらなる簡略化と小形化を図ることができる。
【００４８】
請求項３に記載したチェック方法によれば、手動によって被検出物を移動させる場合のように走査速度が変化しても、走査速度に左右されることなく高精度なチェックを行うことができる。
【図面の簡単な説明】
【図１】本発明の一実施形態の被検出物と検出部を一部切り欠いて示す斜視図。
【図２】図１に示された被検出物と検出部を一部切り欠いて示す平面図。
【図３】本発明の一実施形態の処理装置を一部断面で示す側面図。
【図４】本発明の他の実施形態の被検出物と検出部を一部切り欠いて示す斜視図。
【図５】図４に示された検出部の底面図。
【図６】図４に示された被検出物の位置信号記録部を模式的に示す平面図。
【図７】図４に示された被検出物の出力波形の一例を示す図。
【図８】検出部の変形例を示す底面図。
【図９】検出部の他の変形例を示す底面図。
【図１０】検出部のさらに別の変形例を示す底面図。
【図１１】被検出物の他の実施形態を示す斜視図。
【符号の説明】
１０…被検出物
１１…基材
１２…素子走査部
１３…位置信号記録部
１４…登録データ記録部
２０…磁性素子
３０…処理装置
３１…検出部
３２…第１のセンサ部
３３…第２のセンサ部
４０，４１，５０，５１…ＭＲ素子（磁電変換素子）[0001]
BACKGROUND OF THE INVENTION
This invention includes credit cards, ID cards, CD cards and other cards, passports, important documents and securities, cash vouchers such as banknotes and checks, traveler's checks, or art works such as paintings, public competition voting such as boat racing and horse racing. The present invention relates to an object to be detected, such as a ticket, which needs to be counterfeited and whose authenticity is to be checked, and a check device and a check method therefor.
[0002]
[Prior art]
As means for checking the authenticity of various cards and documents, for example, as described in Japanese Patent Application Laid-Open No. 50-6999, Japanese Patent Application Laid-Open No. 6-179296, or Japanese Patent Application Laid-Open No. 7-32777, There is known one in which collation data is registered in a scanning region of a detection object. In this type of detection object, when the authenticity is checked, the scanning region is scanned by a sensor, and the obtained detection signal is collated with the collation data.
[0003]
In the known example, the processing device for scanning the scanning area of the detection object performs time-division on the detection signal obtained on the condition that the scanning area of the detection object is read at a predetermined constant speed. After digital coding, it is checked whether or not the detected object is authentic by comparing it with pre-registered verification data. For this reason, in a conventional processing apparatus, a sensor is used to read data while moving an object to be detected in a scanning direction at a constant speed by a transport mechanism such as a roller driven by an electric motor capable of controlling the transport speed. .
[0004]
[Problems to be solved by the invention]
The above-described conventional processing apparatus is complicated and the number of parts is increased by using a transport mechanism such as a motor, and the apparatus is increased in size and cost. Further, the conventional processing apparatus has room for improvement such as poor maintainability. For this reason, it has been considered to manually move the detection object.
[0005]
However, when the object to be detected is manually conveyed, the scanning speed is not constant, and there is a problem that the output waveform of the sensor changes according to the scanning speed. For this reason, although it is the same object to be detected, the output waveform will be different each time it is checked, and a highly accurate check cannot be performed.
[0006]
Therefore, for example, by using a roller encoder or the like, a synchronous clock signal corresponding to the amount of movement of the object to be detected is detected, and the output waveform is temporally corrected according to this synchronous clock signal, so that the scanning speed varies. However, it has been considered that almost the same detection signal can be obtained from the same object to be detected. However, in that case, a detection error may occur due to slippage between the roller for detecting the synchronous clock and the object to be detected, and high accuracy check may not be performed. In addition, in that case, it is necessary to incorporate an extra part such as a roller encoder into the processing apparatus, which is not sufficient for reducing the cost and reducing the size.
[0007]
Accordingly, it is an object of the present invention to provide an object to be detected, a check device for the same, and a check method that can simplify and reduce the size of the processing device without reducing the accuracy of the check.
[0008]
[Means for Solving the Problems]
The object to be detected of the present invention for achieving the above object is provided with an area (position signal recording part) for obtaining a position signal on the surface of the object to be detected, and this position signal recording is performed when scanning the element scanning part. The part is also scanned simultaneously, and the detection signal of the element scanning part is always obtained under the same conditions based on the obtained position signal (synchronous clock signal).
[0009]
That is, an object to be detected of the present invention includes a base material made of a magnetic material, an element scanning unit including a plurality of magnetic elements randomly mixed in the base material, and set at a predetermined position of the base material, A registered data recording unit in which verification data relating to a specific output obtained in accordance with the mixing state of magnetic elements in the element scanning unit is encoded and recorded, and the element scanning unit when the element scanning unit is scanned by a sensor A position signal recording unit capable of outputting a signal related to the position of the element, wherein the element scanning unit and the position signal recording unit are provided in a common track region, and the position signal recording unit is provided in the element scanning unit in the common track region. The position signal recording unit alternately changes the magnetization direction in the scanning direction and has the same magnetization direction perpendicular to the scanning direction. Yo are magnetized.
[0010]
The position signal recording unit is, for example, a known high coercive magnetic layer provided on a part of an object to be detected, printed with a predetermined pattern with magnetic ink, or optically read like a barcode. It is also possible to output a synchronous clock signal using a possible recording medium.
[0012]
The processing apparatus according to the present invention includes a first sensor unit that obtains a specific detection signal by magnetically scanning the element scanning unit and capturing an output corresponding to a distribution of magnetic elements included in the element scanning unit. A second sensor unit that obtains a synchronous clock signal by scanning a position signal recording unit that can output a signal corresponding to the position of the first sensor unit with respect to the element scanning unit, and the first sensor unit The detection signal obtained on the basis of the output and the synchronous clock signal is collated with the data registered in the registration data recording unit of the detected object, and when both correspond, the detected object is authentic. The first sensor unit includes a pair of magnetoelectric conversion elements that can detect a position signal of the position signal recording unit at the same time during scanning in a direction orthogonal to the scanning direction. The second sensor unit arranges the pair of magnetoelectric transducers in the front-rear direction with respect to the scanning direction so that a pair of magnetoelectric transducers can detect the position signal with time shift during scanning. The first sensor unit and the second sensor unit are arranged in a common detection head, and the element scanning unit and the position signal recording unit provided in the common track area of the detection object are scanned by the detection head. .
[0014]
As the second sensor unit that scans the position signal recording unit, a magneto-electric conversion element such as an MR element or a unit that magnetically reads the position signal recording unit such as a recording / reading magnetic head can be employed. When the position signal recording unit uses an optical recording medium such as a bar code, a method of optically reading a pattern printed on an object to be detected, or a printing pattern using magnetic ink is used. A magnetic detection method can also be employed.
[0015]
In the checking method of the present invention, the element scanning unit and the position signal recording unit are simultaneously magnetically scanned by the magnetoelectric conversion element pair of the first sensor unit, thereby generating a unique output corresponding to the distribution of the magnetic elements. And a synchronous clock according to the position of the element scanning unit by simultaneously scanning the position signal recording unit and the element scanning unit provided on the object to be detected by the magnetoelectric conversion element pair of the second sensor unit. A step of obtaining a signal, a step of obtaining a detection signal of an element scanning unit that does not depend on a scanning speed based on the output captured by the first sensor unit and a synchronous clock signal obtained by the second sensor unit; A step of collating the detection signal with the data recorded in the registered data recording unit of the detected object, and determining that the detected object is authentic when both correspond.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the detected object 10 in the form of a card or a document (paper sheet) is composed of a base material 11 mainly composed of non-magnetic material such as paper or synthetic resin. An element scanning unit 12 representing the characteristics of the detected object 10, a position signal recording unit 13 for obtaining a synchronous clock signal when the detected object 10 is checked, a registered data recording unit 14, and the like are provided.
[0017]
The element scanning unit 12 is obtained by randomly mixing a large number of fine magnetic elements 20 in the base material 11. An example of the form of the magnetic element 20 is a fibrous element body made of a polymer material mixed with magnetic metal powder (so-called magnetic polymer element), and each magnetic element 20 has an unspecified number of directions. It is suitable. These magnetic elements 20 may be distributed over almost the entire detected object 10. An example of the polymer material used for the element body of the magnetic element 20 is polyethylene, polyester, urethane, or the like, but in short, a well-known synthetic resin having appropriate flexibility can be applied.
[0018]
As the magnetic metal used for the magnetic element 20, a magnetically soft high permeability magnetic material such as permalloy, sendust, Co-based amorphous, soft ferrite, or the like is suitable. For example, ferrite, Sm-Co alloy, A magnetically hard high coercive force material such as an Nd alloy may be used. The form of the magnetic element 20 may be flakes, powders, foils, wires, etc. in addition to the fibrous form.
[0019]
An example of the position signal recording unit 13 is a belt-like magnetic stripe using a magnetic layer made of a magnetic material having a high coercive force. For example, the magnetization direction is a predetermined pitch in the scanning direction of the detected object 10 (direction indicated by arrow F). It is magnetized with a magnetization pattern that reverses at. In the case of this embodiment, in order to reduce the mutual influence between the element scanning unit 12 and the position signal recording unit 13, the element scanning unit 12 and the position signal recording unit 13 are provided in parallel with a distance d from each other. Yes.
[0020]
As will be described later, the position signal recording unit 13 is scanned simultaneously with the element scanning unit 12 by the detection unit (detection head) 31 of the processing device 30 described below when checking the detected object 10, and is obtained from the position signal recording unit 13. The output is reflected in the detection signal of the element scanning unit 12 as a synchronous clock signal.
[0021]
In the registered data recording unit 14, unique information obtained by scanning the element scanning unit 12, that is, unique information (matching data) characterized in accordance with the distribution state of the magnetic element 20, etc. The data is encrypted and written by the processing device 30. In addition to the verification data, various types of information (for example, face value and remaining balance in the case of a prepaid card) may be recorded in the registration data recording unit 14 by a magnetic or optical means or a recording medium such as an IC chip. . Note that the registration data recording unit 14 may record in a storage area (for example, a memory of a host computer) of an electronic device separate from the detected object 10.
[0022]
When the processing apparatus 30 shown in FIG. 3 checks the detected object 10, the detected object 10 is moved in the scanning direction indicated by the arrow F along the movement path 30a. A detection unit 31 as a detection head is provided in the middle of the movement path 30a of the detected object 10. An example of the detection unit 31 illustrated in FIG. 2 includes a first sensor unit 32 for scanning the element scanning unit 12 and a second sensor unit 33 for detecting the position signal recording unit 13.
[0023]
The first sensor unit 32 includes a pair of MR elements (magnetoresistance effect element pairs) 40 and 41 as an example of a magnetoelectric conversion element whose output magnitude does not depend on the scanning speed. A magnet 42 (shown in FIG. 3) is disposed behind the MR elements 40 and 41. The MR elements 40 and 41 have a characteristic that the electric resistance value changes according to the strength of the magnetic field. The MR elements 40 and 41 are electrically connected to each other, and each MR element 40 and 41 is connected to the MR element 40 by the magnet 42. A magnetic field of the same strength is applied. One MR element 40 is connected to a DC power supply 43, and the other MR element 41 is connected to an arithmetic processing collation unit 45 using a microcomputer or the like.
[0024]
When scanning the element scanning unit 12, if the magnetic element 20 passes in the vicinity of the MR elements 40, 41, the magnetic flux passing through the MR elements 40, 41 changes with time according to the position of the magnetic element 20, and the MR element Since there is a difference between the resistance values of 40 and 41, the output voltage of the MR elements 40 and 41 changes. Since this output voltage changes slightly according to the distribution density of the magnetic elements 20 mixed in the element scanning unit 12, the size of the magnetic elements 20, and the like, a waveform of the output voltage specific to the detected object 10 is obtained. It is done.
[0025]
The second sensor unit 33 includes a magnetic head capable of reading a synchronous clock signal (position signal) recorded in the position signal recording unit 14 or an MR element pair similar to the first sensor unit 32. Yes.
[0026]
The processing device 30 includes a code reading unit 55 for reading the data recorded in the registered data recording unit 14. The code reading unit 55 is connected to a reading circuit 56. The arithmetic processing collation unit 45 includes an A / D converter 60, a comparator 61, an encryption code converter 62, and the like for processing the detected signal. A display 63 indicating a check result or the like is connected to the arithmetic processing collation unit 45.
[0027]
Next, an issue process of the detected object 10 and a check process for determining authenticity will be described.
When the detected object 10 is manufactured, the magnetic element 20 is mixed in the base material 11. The magnetic element 12 is mixed in at least the element scanning unit 12, but may be mixed in the entire detected object 10 in some cases. A band-like position signal recording unit 13 and a registration data recording unit 14 made of a magnetic layer having a high coercive force are formed on the object 10 to be detected.
[0028]
In the issuance process of the detected object 10, the element scanning unit 12 is scanned at a predetermined speed by the detection unit using the MR element pair similar to the detection unit 31, and the waveform of the output voltage is encrypted by a specific algorithm. Is recorded in the registered data recording unit 14. Although the registration data recording unit 14 of this embodiment is a magnetic band, an optically readable mark (for example, a bar code, a two-dimensional bar code, an OCR character, etc.) is recorded on the registration data recording unit 14 by a print head. Alternatively, magnetic ink may be used, or a hologram on which a code is recorded may be stamped in order according to an encryption code.
[0029]
Further, when the element scanning unit 12 is scanned by the detection unit, the position signal recording unit 13 is magnetized by a magnetic head or the like in order to obtain a synchronous clock signal corresponding to the position of the element scanning unit 12. For example, as in the position signal recording unit 13 shown in FIG. 6, magnetization is performed so that the magnetization direction is alternately reversed at a constant interval along the scanning direction F.
[0030]
The processing device 30 checks whether the detected object 10 is authentic. The detected object 10 is inserted into the processing device 30, and the detected object 10 is moved in the scanning direction F along the movement path 30a. At that time, the element scanning unit 12 is scanned by the first sensor unit 32 and the position signal recording unit 13 is scanned by the second sensor unit 33.
[0031]
When the element scanning unit 12 is scanned by the first sensor unit 32, the magnetic element 20 included in the element scanning unit 12 sequentially passes in the vicinity of the MR elements 40 and 41. At this time, the magnetic flux passing through the MR elements 40 and 41 changes with time according to the position and distribution state of the magnetic element 20, so that a unique voltage waveform is output to the element scanning unit 12. This waveform is time-divided based on the synchronous clock signal of the position signal recording unit 13 detected by the second sensor unit 33, and the output voltage is ranked in a plurality of stages for each divided minute portion and digitized. The In this way, the detection signal of the element scanning unit 12 independent of the scanning speed is obtained. This detection signal is decrypted by the encryption code converter 62 according to a specific algorithm.
[0032]
The verification data recorded in the registered data recording unit 14 is read by the code reading unit 55. The comparison data is compared with the decoded detection signal of the element scanning unit 12 by the comparator 61, and when both are matched, it is determined that the detected object 10 is genuine, and the comparison result is displayed on the display. 63.
[0033]
In this way, the detection signal of the element scanning unit 12 obtained by the first sensor unit 32 is time-divided based on the synchronous clock signal (position detection signal) obtained by the second sensor unit 33, thereby detecting the detection target. Even if the moving speed of the object 10 is not constant, the element scanning unit 12 can always be detected under the same conditions. For this reason, it is possible to collate data with high accuracy even at an unstable manual movement speed, and a processing device with a simple configuration without using a transport mechanism using a motor or the like, or a time correction means such as a roller encoder. With 30, it is possible to realize true / false judgment with high accuracy. The processing device 30 may include a transport mechanism that is driven by a motor.
[0034]
Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4, the detected object 10 of this embodiment is provided with the element scanning unit 12 and the position signal recording unit 13 in substantially the same track region, thereby simplifying the further configuration of the processing apparatus 30. It is possible to realize downsizing, miniaturization, and weight reduction.
[0035]
As shown in FIG. 5 and the like, the detection unit 31 of the processing device for determining the authenticity of the detected object 10 includes a first sensor unit 32 and a second sensor unit arranged in a common detection head 70. 33.
[0036]
The first sensor unit 32 can detect a pair of MR elements 40 and 41 similar to those described in the above embodiment in the direction orthogonal to the scanning direction F, that is, the position signal of the position signal recording unit 13 at the time of scanning. It is provided at the correct position. On the other hand, the second sensor unit 33 detects the pair of MR elements 50 and 51 in the front-rear direction with respect to the scanning direction F, that is, the position where the position signal of the position signal recording unit 13 is detected with a time shift during scanning. 50 and 51 are provided.
[0037]
As shown in FIG. 6, the position signal recording unit 13 is magnetized so that the direction of magnetization alternately changes at a constant pitch as indicated by arrows A and B with respect to the scanning direction F. In the case of this embodiment, the element scanning unit 12 and the position signal recording unit 13 are simultaneously scanned by the sensor units 32 and 33 provided in one detection head 70.
[0038]
In this case, since the same magnetic field of the position signal recording unit 13 is applied to the MR elements 40 and 41 in the first sensor unit 32, the signal (position signal) of the position signal recording unit 13 is canceled. For this reason, the signal of the position signal recording unit 13 is not detected in the first sensor unit 32. However, since the MR elements 40 and 41 capture a change in magnetic flux of the element scanning unit 12, an output waveform W1 as shown in FIG. 7 is detected according to the mixed pattern of the magnetic elements 20 in the element scanning unit 12, for example.
[0039]
On the other hand, in the second sensor unit 33, different magnetic fields of the position signal recording unit 13 are applied to the MR elements 50 and 51, and the MR elements 50 and 51 detect a change in magnetic flux of the element scanning unit 12. Therefore, in the second sensor unit 33, a synthesized waveform of the output waveform corresponding to the mixed pattern of the magnetic element 20 in the element scanning unit 12 and the output waveform (position signal) of the position signal recording unit 13 is obtained. Detected. Here, since the output waveform of the position signal recording unit 13 is sufficiently larger than the output waveform W1 of the element scanning unit 12, the synthesized waveform is substantially a position signal recording as shown by a waveform W2 shown in FIG. The waveform is almost the same as that of the section 13.
[0040]
Therefore, a synchronous clock signal is obtained from the combined waveform W2 output from the second sensor unit 33, and the output waveform W1 of the first sensor unit 32 is time-divided. Thereby, it becomes possible to detect the detection signal according to the distribution state of the magnetic element 20 output from the first sensor unit 32 under the same condition regardless of the scanning speed.
[0041]
By providing the element scanning unit 12 and the position signal recording unit 13 on the same track as described above, the detection unit 31 of the processing device 30 only needs one detection head 70. Therefore, the processing device 30 can be reduced in size, weight, and weight. This is further advantageous for cost reduction. In addition, by providing the element scanning unit 12 and the position signal recording unit 13 on the same track of the detected object 10, the detected object 10 can be reduced in size. Further, when the element scanning unit 12 and the position signal recording unit 13 are provided on the same track, when the object 10 is scanned, the element scanning unit 12 and the position signal recording unit 13 are not easily affected by the positional deviation in the rotation direction indicated by the arrow R in FIG. In addition, there is an advantage that the check can be performed with high accuracy.
[0042]
8 is an example in which the MR elements 40 and 41 of the first sensor unit 32 provided in the common detection head 70 have a horizontally long shape in the scanning direction F. The detection unit 31 illustrated in FIG. 9 is an example in which the MR elements 40 and 41 of the first sensor unit 32 have a shape extending obliquely with respect to the scanning direction F. The detection unit 31 shown in FIG. 10 is an example in which the MR elements 40 and 41 of the first sensor unit 32 are arranged in a V shape that is transverse to the scanning direction F.
[0043]
In any of these embodiments, the first sensor unit 32 is provided with a magnetoelectric conversion element pair (MR elements 40 and 41) at a position where the position signal of the position signal recording unit 13 can be detected simultaneously during scanning. In addition, the second sensor unit 33 is provided with a magnetoelectric conversion element pair (MR elements 50 and 51) at a position where the position signal is detected while being shifted in time during scanning. By adopting the MR elements 40 and 41 (FIGS. 8, 9, and 10) having such a configuration, the detection unit 31 is hardly affected by the positional deviation between the element scanning unit 12 and the position signal recording unit 13. It is possible to further reduce the size of the detection unit 31.
[0044]
The embodiment of the detected object 10 shown in FIG. 11 is an example in which the element scanning unit 12 and the position signal recording unit 13 and the registered data recording unit 14 are provided in a part of the IC card 80. Since other basic configurations and operations are the same as those in the above embodiment, the same reference numerals are assigned to the same portions as those in the above embodiment, and the description thereof is omitted. The IC card 80 also scans the element scanning unit 12 and the position signal recording unit 13 simultaneously by the detection unit 31 similar to the above-described embodiment, and based on the synchronous clock signal obtained by the position signal recording unit 13, The output is time-divided, and the arithmetic processing collation unit 45 collates with the data in the registered data recording unit 14.
[0045]
【The invention's effect】
According to the object to be detected according to the first aspect, it is possible to perform a highly accurate check even when the scanning speed changes, and there is no problem of accuracy degradation due to slipping as seen when using a roller encoder. The configuration of the processing apparatus can also be simplified .
[0046]
According to this detected object, providing the element scanning unit and the position signal recording unit on the common track is advantageous in reducing the size of the detected object. In addition, the influence of the displacement of the detected object can be reduced.
[0047]
According to the processing apparatus of the second aspect , it is possible to perform a highly accurate check without using a transport mechanism that drives a motor or the like. Further, the configuration of the processing apparatus is simplified, the number of parts can be reduced, and the processing apparatus can be reduced in size and cost. According to this processing apparatus, by providing the first sensor unit and the second sensor unit in a common detection head, the processing apparatus can be further simplified and miniaturized.
[0048]
According to the check method described in claim 3 , even if the scanning speed changes as in the case of manually moving the detection object, a highly accurate check can be performed regardless of the scanning speed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an object to be detected and a detection unit in a partially cutaway manner according to an embodiment of the present invention.
FIG. 2 is a plan view showing the detected object and the detection unit shown in FIG.
FIG. 3 is a side view of the processing apparatus according to the embodiment of the present invention, partly in cross section.
FIG. 4 is a perspective view showing another object to be detected and a detection unit according to another embodiment of the present invention with a part cut away.
5 is a bottom view of the detection unit shown in FIG. 4. FIG.
6 is a plan view schematically showing a position signal recording unit of the detected object shown in FIG. 4;
7 is a diagram showing an example of an output waveform of the detected object shown in FIG.
FIG. 8 is a bottom view showing a modification of the detection unit.
FIG. 9 is a bottom view showing another modification of the detection unit.
FIG. 10 is a bottom view showing still another modification of the detection unit.
FIG. 11 is a perspective view showing another embodiment of an object to be detected.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Detected object 11 ... Base material 12 ... Element scanning part 13 ... Position signal recording part 14 ... Registration data recording part 20 ... Magnetic element 30 ... Processing apparatus 31 ... Detection part 32 ... 1st sensor part 33 ... 2nd Sensor unit 40, 41, 50, 51 ... MR element (magnetoelectric conversion element)

Claims

A base material made of a non-magnetic material;
An element scanning unit including a large number of magnetic elements randomly mixed in the substrate and set at a predetermined position of the substrate;
A registered data recording unit in which verification data relating to a specific output obtained according to the mixing state of magnetic elements in the element scanning unit is encoded and recorded;
A position signal recording unit capable of outputting a signal related to the position of the element scanning unit when the element scanning unit is scanned by a sensor;
Equipped with,
The element scanning section and the position signal recording section are provided in a common track area, and the position signal recording section extends in the scanning direction of the element scanning section in a state where the position signal recording section overlaps the element scanning section in the common track area,
The position signal recording unit is magnetized so that the magnetization direction is alternately changed in the scanning direction and the magnetization direction is the same in a direction orthogonal to the scanning direction. The detected object.

In the processing apparatus for checking the authenticity of the object to be detected,
The detected object is:
A base material made of a non-magnetic material;
An element scanning unit including a large number of magnetic elements randomly mixed in the substrate and set at a predetermined position of the substrate;
A registered data recording unit in which verification data relating to a specific output obtained according to the mixing state of magnetic elements in the element scanning unit is encoded and recorded;
A position signal recording unit capable of outputting a signal related to the position of the element scanning unit when the element scanning unit is scanned by a sensor;
The element scanning section and the position signal recording section are provided in a common track area, and the position signal recording section extends in the scanning direction of the element scanning section in a state where the position signal recording section overlaps the element scanning section in the common track area,
The position signal recording unit is magnetized so that the direction of magnetization is alternately changed in the scanning direction and the direction of magnetization is the same in a direction perpendicular to the scanning direction,
The processor is
A first sensor unit that captures an output corresponding to a distribution of magnetic elements included in the element scanning unit by magnetically scanning the element scanning unit and obtains a unique detection signal;
A second sensor unit for obtaining a synchronous clock signal by scanning a position signal recording unit capable of outputting a signal corresponding to the position of the first sensor unit with respect to the element scanning unit;
The detection signal obtained based on the output captured by the first sensor unit and the synchronous clock signal is collated with the data registered in the registered data recording unit of the detected object, and when both correspond, Means for determining that the detected object is authentic ,
The first sensor unit arranges the magnetoelectric conversion element pair in a direction orthogonal to the scanning direction so that a pair of magnetoelectric conversion elements can simultaneously detect the position signal of the position signal recording unit during scanning,
The second sensor unit arranges the pair of magnetoelectric transducers in the front-rear direction with respect to the scanning direction so that a pair of magnetoelectric transducers can detect the position signal with time shift during scanning,
The first sensor unit and the second sensor unit are arranged in a common detection head, and the element scanning unit and the position signal recording unit provided in the common track area of the detection object are scanned by the detection head. A processing device for checking the authenticity of a featured object to be detected.

A method for checking using the processing device the authenticity of the object to be detected,
The detected object is:
A base material made of a non-magnetic material;
An element scanning unit including a large number of magnetic elements randomly mixed in the substrate and set at a predetermined position of the substrate;
A registered data recording unit in which verification data relating to a specific output obtained according to the mixing state of magnetic elements in the element scanning unit is encoded and recorded;
A position signal recording unit capable of outputting a signal related to the position of the element scanning unit when the element scanning unit is scanned by a sensor;
The element scanning section and the position signal recording section are provided in a common track area, and the position signal recording section extends in the scanning direction of the element scanning section in a state where the position signal recording section overlaps the element scanning section in the common track area,
The position signal recording unit is magnetized so that the direction of magnetization is alternately changed in the scanning direction and the direction of magnetization is the same in a direction perpendicular to the scanning direction,
The processor is
A first sensor unit that captures an output corresponding to a distribution of magnetic elements included in the element scanning unit by magnetically scanning the element scanning unit and obtains a unique detection signal;
A second sensor unit for obtaining a synchronous clock signal by scanning a position signal recording unit capable of outputting a signal corresponding to the position of the first sensor unit with respect to the element scanning unit;
The detection signal obtained based on the output captured by the first sensor unit and the synchronous clock signal is collated with the data registered in the registered data recording unit of the detected object, and when both correspond, Means for determining that the detected object is authentic,
The first sensor unit arranges the magnetoelectric conversion element pair in a direction orthogonal to the scanning direction so that a pair of magnetoelectric conversion elements can simultaneously detect the position signal of the position signal recording unit during scanning,
The second sensor unit arranges the pair of magnetoelectric transducers in the front-rear direction with respect to the scanning direction so that a pair of magnetoelectric transducers can detect the position signal with time shift during scanning,
The first sensor unit and the second sensor unit are arranged in a common detection head, and the element scanning unit and the position signal recording unit provided in the common track region of the detection object are scanned by the detection head,
Obtaining a unique output corresponding to the distribution of the magnetic element by simultaneously magnetically scanning the position signal recording unit and the element scanning unit by the electromagnetic element pairs of the first sensor unit,
Obtaining a synchronous clock signal in accordance with the position of the element scanning unit by simultaneously scanning the position signal recording unit and the element scanning unit provided on the object to be detected by the magnetoelectric conversion element pair of the second sensor unit; ,
Obtaining a detection signal of the element scanning unit independent of the scanning speed based on the output captured by the first sensor unit and the synchronous clock signal obtained by the second sensor unit;
Collating the detection signal with data recorded in the registered data recording unit of the detected object, and determining that the detected object is authentic when both correspond;
A method for checking an object to be detected.