JP2004246714A - Pearl ink detection device and pearl ink detection method - Google Patents

Pearl ink detection device and pearl ink detection method Download PDF

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JP2004246714A
JP2004246714A JP2003037140A JP2003037140A JP2004246714A JP 2004246714 A JP2004246714 A JP 2004246714A JP 2003037140 A JP2003037140 A JP 2003037140A JP 2003037140 A JP2003037140 A JP 2003037140A JP 2004246714 A JP2004246714 A JP 2004246714A
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Japan
Prior art keywords
pearl
light
pearl ink
ink
light source
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JP2003037140A
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Japanese (ja)
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Mitsuaki Usami
光陽 宇佐美
Hideaki Kamijo
秀章 上條
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Nidec Precision Corp
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Nidec Copal Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pearl ink detection device and a pearl ink detection method which can detect a pearl ink printing part on paper sheets on which a pearl ink is applied. <P>SOLUTION: The pearl ink detection device 10 is provided in order to mechanically discriminate the pearl ink printing part P. As results of various experiments performed in order to realize the mechanical discrimination, it is found that the pearl ink part P hardlt transmits light of 350-480nm wavelength. Thus, a wavelength transmitting filter 16 is arranged between a light source 12 and a light receiving element 22, thereby limiting a wavelength transmitting band with which the pearl ink printing part P is irradiated to 350-480 nm. The wavelength passing filter 16 is adopted, so that various light sources can be itilized, for example, the light sources of a black light, an LED or the like can be selected in accordance with application and cost. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、紙幣、商品券、カード等の紙葉類における真偽の判別に利用するためのパールインキ検出装置及びパールインキ検出方法に関するものである。
【０００２】
【従来の技術】
従来、紙幣の真偽を判別する装置として、特表平９−５０７３２６号公報がある。この公報に記載された装置は、紙幣に紫外線を照射し、紙幣で反射した紫外光のレベルを第１のフォトセルを用いて測定し、それと同時に、紙幣で発生する蛍光の量を第２のフォトセルで測定し、それぞれの測定量を基準レベルと比較して、紙幣の真偽を判別させるものである。
【０００３】
【特許文献１】
特表平９−５０７３２６号公報
【特許文献２】
特開２００２−１０９５９８号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、前述した従来の装置は、カラーコピーされた偽造紙幣や、蛍光ペンにより蛍光体を模擬した偽造紙幣に対しては、有効な手段であるが、近年においては、複写・偽造防止用のインキとしてパール顔料を含むインキ（以下、「パールインキ」と呼ぶ）を用いて印刷が施された紙幣が出現しており、これに適する機械的な偽造防止対策がなされていないのが現実であった。
【０００５】
本発明は、パールインキを塗布した紙葉類におけるパールインキ印刷部の検出を可能にしたパールインキ検出装置及びパールインキ検出方法を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明に係るパールインキ検出装置は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する装置であって、筐体内に収容されると共に、紙葉類のパールインキ印刷部に向けて光を出射する光源と、光源に対向して配置されると共に、パールインキ印刷部を透過した光を受光する受光素子と、光源と受光素子との間に配置されると共に、波長透過帯域が３５０〜４８０ｎｍの帯域内にある波長透過フィルタとを備えたことを特徴とする。
【０００７】
蛍光灯や自然光下で彩色を放つパールインキによる印刷は、近年、紙葉類に対する偽造防止などの目的で利用されている。また、目視によってある角度から見た場合にのみ光沢や色が分かるような状態でパールインキ印刷が施されている場合、紙葉類を色々な角度に向けながらパールインキ印刷部の確認を行わなければならず、目視による確認作業は煩雑となる。そこで、本発明に係るパールインキ検出装置は、パールインキ印刷部の機械的な判別を可能するために創作されたものであり、その機械化を実現するために行われた様々な実験の結果、パールインキ印刷部は、３５０〜４８０ｎｍの波長を極めて通しにくいという特性をもっていることが発明者らによって見出された。そこで、この特性を踏まえて、光源と受光素子との間に波長透過フィルタを配置させ、この波長透過フィルタによって、パールインキ印刷部に照射される波長透過帯域を３５０〜４８０ｎｍに制限している。このような波長透過フィルタの採用は、様々な光源の利用を可能にし、例えば、ブラックライトやＬＥＤなどの光源を用途やコストに合わせて選択することが可能となる。
【０００８】
本発明に係るパールインキ検出装置は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する装置であって、筐体内に収容されると共に、紙葉類のパールインキ印刷部に向けて光を出射する光源と、光源に対向して配置されると共に、パールインキ印刷部を透過した光を受光する受光素子とを備え、光源は、波長ピーク値が３５０〜４８０ｎｍの帯域内に入っていることを特徴とする。
【０００９】
蛍光灯や自然光下で彩色を放つパールインキによる印刷は、近年、紙葉類に対する偽造防止などの目的で利用されている。また、目視によってある角度から見た場合にのみ光沢や色が分かるような状態でパールインキ印刷が施されている場合、紙葉類を色々な角度に向けながらパールインキ印刷部の確認を行わなければならず、目視による確認作業は煩雑となる。そこで、本発明に係るパールインキ検出装置は、パールインキ印刷部の機械的な判別を可能するために創作されたものであり、その機械化を実現するために行われた様々な実験の結果、パールインキ印刷部は、３５０〜４８０ｎｍの波長を極めて通しにくいという特性をもっていることが発明者らによって見出された。そこで、この特性を踏まえて、光源には、波長ピーク値が３５０〜４８０ｎｍの帯域内に入っているものを利用する。これによって、パールインキ印刷部に最適な波長の光を照射することができる。なお、このような波長ピークをもった光源を利用したパールインキ検出装置であっても、場合によっては、波長透過帯域が３５０〜４８０ｎｍの波長透過フィルタを、光源と受光素子との間に配置させてもよい。
【００１０】
また、受光素子からの出力を増幅する増幅手段と、増幅手段からの信号出力を積分波に変換する積分手段と、増幅手段からの出力信号と積分手段からの出力信号とを比較してパールインキ印刷部の判定信号を送出する比較手段とを備えると好適である。このような構成の採用により、簡単な構成をもって、パールインキ検出装置から判別信号を送出させることができ、装置自体の簡素化と利便性が向上する。
【００１１】
本発明に係るパールインキ検出装方法は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する方法であって、光源から出射した光を、波長透過フィルタで波長制限した後にパールインキ印刷部に照射し、光源に対向した受光素子でパールインキ印刷部を透過した光を受光することを特徴とする。
【００１２】
本発明に係るパールインキ検出装方法は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する方法であって、パールインキ印刷部を透過しにくい光を光源からパールインキ印刷部に向けて照射し、光源に対向した受光素子でパールインキ印刷部を透過した光を受光することを特徴とする。
【００１３】
【発明の実施の形態】
以下、図面を参照しつつ本発明に係るパールインキ検出装置及びパールインキ検出方法の好適な一実施形態について詳細に説明する。
【００１４】
図１は、紙葉類検査器１を示す断面図であり、この紙葉類検査器１で検査対象になっているのは、紙葉類の一例である紙幣の真偽判別である。具体的には、カラーコピーされた偽造紙幣と正規の紙幣との判別であり、このカラーコピー用紙には、多量の蛍光成分が含まれている。また、２０００円札においては、偽造防止対策の一つとして、パールインキによる印刷が施されている部分があり、「財務省印刷局ホームページ“お札の偽造防止技術”」に開示されている。
【００１５】
図１に示すように、紙葉類検査器１には、上下のガイド板２，３で挟まれるようにして形成させた直線的な搬送通路４が設けられ、この搬送経路４の途中には、搬送ローラ５，６が配置され、各搬送ローラ５，６によって紙幣Ｒを排出側に向けて確実に搬送させている。このような搬送通路４の途中には、図示しない紙幣認識装置が配置されている。
【００１６】
この紙幣認識装置は、ＬＥＤ光源によって紙幣Ｒを照らし、紙幣Ｒからの反射光をＣＣＤカメラで捕捉する構造をもっている。そして、カメラで撮像された画像と既知の画像データとの照合を行い、紙幣の金種を判別している。しかし、近年、カラーコピーの高精度化によって、画像認識だけでは、紙幣Ｒの真偽を判別しにくい状態になっている。そこで、紙幣認識装置の上流側に、図示しない紙葉類蛍光検出センサを配置させている。この紙葉類蛍光検出センサは、紙幣Ｒに紫外線を照射して、偽造紙幣Ｒから発せられる蛍光を、蛍光受光素子で受光して、紙幣Ｒの種類や真偽などを判別している。
【００１７】
近年、偽造防止対策として、紙幣Ｒの印刷の一部にパールインキが採用されており、パールインキ印刷部Ｐは、光沢があるので目視による確認が可能である。具体的に、２０００円札（図３参照）においては、ある角度から観察するとピンク色に見えるようになっている。また、パールインキは、既知であり、天然雲母の厚さ、細かさ、粒子分布などにより、光の吸収、散乱、反射を異ならせることができ、様々な光彩を作り出している。また、パールインキによる印刷において、顔料である二酸化チタンの膜厚の違いによって銀、黄、赤、青、緑など様々な彩色が出現する。なお、パールインキとして利用される顔料は様々であり、顔料の違いにより彩色を異ならせることができる。パールインキに関する技術として、例えば、特開平０９−２４０１３３号公報、特開平０９−２６７５９２号公報、特開２００２−２８５０６１号公報、「機能性インキの最新技術」（株式会社シーエムシー出版）などがある。
【００１８】
蛍光灯や自然光下で輝きを放つパールインキ印刷部Ｐは、紙幣Ｒの偽造防止などの目的で使われており、２０００円札（図３参照）においては、目視によってある角度から見た場合に彩色が分かるようになっている。このような場合、紙幣Ｒを様々な角度に向けながらパールインキ印刷部Ｐの確認を行うことになり、目視による確認作業は煩雑であった。
【００１９】
そこで、２０００円札のパールインキ印刷部Ｐの機械的な判別を可能するために様々な実験を行い、その結果として、パールインキ印刷部Ｐは、紫外光から青紫色の光を極めて通しにくいという特性をもっていることが発明者らによって見出された。具体的には、パールインキ印刷部Ｐが３５０〜４８０ｎｍの可視光から紫外光領域にかかる光（以下、「青紫光」という）を極めて通し難く、その事実を踏まえて、パールインキ検出装置１０が発案された。
【００２０】
図２に示すパールインキ検出装置１０は、前述した紙葉類検査器１の搬送通路４の途中への配置を可能にするため、上ガイド板２に固定される略直方体形状の筺体１１を有する。そして、この筐体１１内には、搬送通路４に向けて青紫光を真上から照射するための青紫色のＬＥＤ（光源）１２が収容されている。このＬＥＤ１２は、筐体１１に取付けられた駆動回路基板１３に対しリード部１２ａを介し吊されるように固定されている。そして、このＬＥＤ１２は、パールインキの特性に合うように、波長ピーク値が３５０〜４８０ｎｍの帯域内に入っているものが選択される。また、筐体１１の下面には、搬送通路４に臨むようにして配置される防塵ガラス板１４が接着剤を介して固定され、この防塵ガラス板１４には、青紫光を透過しやすいガラスが採用されている。
【００２１】
さらに、筐体１１内には、ＬＥＤ１２と防塵ガラス板１４との間において、波長透過フィルタ１６が接着剤を介して固定されている。この波長透過フィルタ１６には、波長透過帯域が３５０〜４８０ｎｍのものが利用される。このフィルタ１６を利用すると、コスト等を考慮して、広い波長帯域のＬＥＤが例え利用されたとしても、波長制限を可能にして、光波長成分中に含まれている余分な光成分をカットして、パールインキ印刷部Ｐに適正な光を確実に照射することができる。
【００２２】
さらに、このパールインキ検出装置１０は、フォトセンサからなる受光素子２２を収容する略直方体形状の筐体２１を有し、この筐体２１は、下ガイド板３に固定されると共に、光源側の筐体１１に対向して配置されている。筐体２１内には、ＬＥＤ１２から出射してパールインキ印刷部Ｐを透過した光を受光するための受光素子２２が収容され、この受光素子２２は、筐体２１に取付けられた駆動回路基板２３に対しリード部２２ａを介して固定されている。また、筐体２１の上面には、搬送通路４に臨むようにして配置される防塵ガラス板２４が接着剤を介して固定されている。
【００２３】
ここで、受光素子２２の受光波長帯域が３５０〜４８０ｎｍのみをカバーするものであると、例えば、パールインキ印刷部Ｐを蛍光ペンで偽造した場合でも、受光素子２２での受光量が極端に減少してしまって、真偽の判別が困難になる。そこで、蛍光インキが青紫光照射によって蛍光を発する特性に鑑みて、受光素子２２は、紫外光、可視光、赤外光を広範囲に受光できるものが好ましい。すなわち、受光波長帯域を青紫光のみに限定しないことで、幅広い偽造防止対策が可能になる。なお、偽造に使われるカラーコピー用紙自体にも多量の蛍光成分が含まれており、青紫光線照射時に多量の蛍光を発する。
【００２４】
このような受光素子２２と青紫色ＬＥＤ１２とを利用して、パールインキ印刷部Ｐ上を通るように２０００円札（図３参照）を矢印Ａ方向にスキャンしながら実験した結果、図４に示すように、パールインキ印刷部Ｐの全長に亘って受光量が著しく低下することが判明し、このことから、パールインキ印刷部Ｐは上述した特定の波長の光を極めて通しにくいことが分かる。これに対し、一般的に用いられている緑色で波長ピーク値が約５５０ｎｍのＬＥＤを利用し、２０００円札（図３参照）を矢印Ａ方向にスキャンしながら実験した結果、図５に示すように、パールインキ印刷部Ｐでの受光量が不規則に変化することが判るが、受光量の変化に特徴的な現象は見出せない。
【００２５】
図４から判るように、青紫色の光は、パールインキ印刷部Ｐを透過し難く、受光量が極端に落ち込む現象が見出されるので、このような受光波形に鑑みて、パールインキ検出装置１０は、簡単な判定回路２６によって、パールインキ印刷部Ｐの有る無し信号（判別信号）を出力させることができる。例えば、この判別回路２６は、受光素子２２からの微弱な出力を増幅する増幅回路（増幅手段）２７と、増幅回路２７からの信号出力を積分波に変換する積分回路２８と、増幅回路２７からの出力信号と積分回路２８からの出力信号とを比較して判別信号を送出する比較回路２９とを備えている。
【００２６】
よって、受光素子２２から出力された信号は、微弱であると共に矩形波に近い波形を有しているので、この信号を増幅回路２７によって増幅した後、ステップ１（Ｓ１）で積分波形を作り出す。次に、増幅回路２７からの出力と積分回路２８からの出力を、ステップ２で比較演算することによって、単なる有る無し信号（判別信号）を比較回路２９から出力させることができる。このように、極めて簡単な回路構成をもって、パールインキ印刷部Ｐの有る無しを判定することができ、パールインキ検出装置１０自体の利便性が向上する。例えば、パールインキ印刷部Ｐが検出される場合に、比較回路２９から信号を発すると好適である。
【００２７】
本発明は、前述した実施形態に限定されるものではない。例えば、紙葉類としては、紙幣に限定されず、商品券などの金券、カード類、証明書、有価証券などであってもよい。光源として、ブラックライトを利用することもできる。
【００２８】
また、本実施形態において、紙葉類Ｒ上のパールインキ印刷部Ｐに用いられているインキは、３５０〜４８０ｎｍの波長の光が透過しにくくなっているが、インキに用いられている顔料の特性により、上記波長帯域以外で光が透過しにくくなる場合もあるので、これに応じた光源や波長透過フィルタを用いることもできる。
【００２９】
【発明の効果】
本発明によるパールインキ検出装置は、以上のように構成されているため、次のような効果を得る。すなわち、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する装置であって、筐体内に収容されると共に、紙葉類のパールインキ印刷部に向けて光を出射する光源と、光源に対向して配置されると共に、パールインキ印刷部を透過した光を受光する受光素子と、光源と受光素子との間に配置されると共に、波長透過帯域が３５０〜４８０ｎｍの帯域内のある波長透過フィルタとを備えたことにより、極めて簡単な構成をもって、紙葉類におけるパールインキ印刷部の検出を可能にする。
【００３０】
また、本発明によるパールインキ検出装置は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する装置であって、筐体内に収容されると共に、紙葉類のパールインキ印刷部に向けて光を出射する光源と、光源に対向して配置されると共に、パールインキ印刷部を透過した光を受光する受光素子とを備え、光源は、波長ピーク値が３５０〜４８０ｎｍの帯域内に入っていることにより、極めて簡単な構成をもって、紙葉類におけるパールインキ印刷部の検出を可能にする。
【００３１】
また、本発明によるパールインキ検出方法は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する方法であって、光源から出射した光を、波長透過フィルタで波長制限した後にパールインキ印刷部に照射し、光源に対向した受光素子でパールインキ印刷部を透過した光を受光することにより、紙葉類におけるパールインキ印刷部の検出を可能にし、装置構成が簡単となる。
【００３２】
また、本発明によるパールインキ検出方法は、パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する方法であって、パールインキ印刷部を透過しにくい光を光源からパールインキ印刷部に向けて照射し、光源に対向した受光素子でパールインキ印刷部を透過した光を受光することにより、紙葉類におけるパールインキ印刷部の検出を可能にし、装置構成が簡単となる。
【図面の簡単な説明】
【図１】本発明に係るパールインキ検出装置を適用した紙葉類検査器の一例を示す断面図である。
【図２】本発明に係るパールインキ検出装置の一実施形態を示す断面図である。
【図３】２０００円札を示す正面図である。
【図４】紙幣に青紫光を照射した時、受光素子から出力される電圧の変化を示すグラフである。
【図５】紙幣に可視光線を照射した時、受光素子から出力される電圧の変化を示すグラフである。
【図６】本発明に係るパールインキ検出装置に適用する判別回路を示す図である。
【符号の説明】
１０…パールインキ検出装置、１１…筐体、１２…ＬＥＤ（光源）、１６…波長透過フィルタ、２２…受光素子、２７…増幅回路（増幅手段）、２８…積分回路（積分手段）、２９…比較回路（比較手段）、Ｒ…紙幣（紙葉類）、Ｐ…パールインキ印刷部。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pearl ink detection device and a pearl ink detection method for use in determining the authenticity of paper sheets such as banknotes, gift certificates, cards, and the like.
[0002]
[Prior art]
Conventionally, there is Japanese Patent Publication No. 9-507326 as a device for determining the authenticity of a bill. The device described in this publication irradiates a banknote with ultraviolet light, measures the level of ultraviolet light reflected by the banknote using a first photocell, and at the same time, measures the amount of fluorescence generated by the banknote in a second photocell. The bill is measured by a photocell, and each measured amount is compared with a reference level to determine whether the bill is authentic.
[0003]
[Patent Document 1]
Japanese Patent Publication No. 9-507326 (Patent Document 2)
JP-A-2002-109598
[Problems to be solved by the invention]
However, the above-described conventional apparatus is an effective means for counterfeit banknotes that are color-copied or for simulating a fluorescent material with a highlighter pen, but in recent years, ink for copy / counterfeiting prevention has been used. Banknotes printed with ink containing pearl pigment (hereinafter referred to as "pearl ink") have emerged, and it has been a reality that no mechanical counterfeiting prevention measures suitable for this have been taken. .
[0005]
An object of the present invention is to provide a pearl ink detection device and a pearl ink detection method that enable detection of a pearl ink printed portion in a paper sheet coated with pearl ink.
[0006]
[Means for Solving the Problems]
A pearl ink detection device according to the present invention is a device that detects a pearl ink printed portion of a paper sheet printed using an ink containing a pearl pigment, and is housed in a housing and has a pearl ink of a paper sheet. A light source that emits light toward the printing unit, and a light receiving element that is disposed to face the light source and receives light transmitted through the pearl ink printing unit, and is disposed between the light source and the light receiving element, A wavelength transmission filter having a wavelength transmission band within a band of 350 to 480 nm.
[0007]
In recent years, printing using pearl ink which emits color under fluorescent light or natural light has been used for the purpose of preventing forgery of paper sheets and the like. In addition, if pearl ink printing is applied in such a way that gloss and color can be seen only when viewed from a certain angle, the pearl ink printing area must be checked while turning the paper sheets at various angles. That is, the visual confirmation work becomes complicated. Therefore, the pearl ink detection device according to the present invention was created to enable mechanical discrimination of the pearl ink printing section, and as a result of various experiments performed to realize the mechanization, The inventors have found that the ink printing portion has a characteristic that it is extremely difficult to transmit a wavelength of 350 to 480 nm. Therefore, based on this characteristic, a wavelength transmission filter is disposed between the light source and the light receiving element, and the wavelength transmission filter limits the wavelength transmission band applied to the pearl ink printing portion to 350 to 480 nm. The use of such a wavelength transmission filter enables various light sources to be used, and for example, a light source such as a black light or an LED can be selected in accordance with a use or cost.
[0008]
A pearl ink detection device according to the present invention is a device that detects a pearl ink printed portion of a paper sheet printed using an ink containing a pearl pigment, and is housed in a housing and has a pearl ink of a paper sheet. A light source that emits light toward the printing unit, and a light receiving element that is arranged to face the light source and receives light transmitted through the pearl ink printing unit, includes a light source having a wavelength peak value of 350 to 480 nm. It is characterized by being in the band.
[0009]
In recent years, printing using pearl ink which emits color under fluorescent light or natural light has been used for the purpose of preventing forgery of paper sheets and the like. In addition, if pearl ink printing is applied in such a way that gloss and color can be seen only when viewed from a certain angle, the pearl ink printing area must be checked while turning the paper sheets at various angles. That is, the visual confirmation work becomes complicated. Therefore, the pearl ink detection device according to the present invention was created to enable mechanical discrimination of the pearl ink printing section, and as a result of various experiments performed to realize the mechanization, The inventors have found that the ink printing portion has a characteristic that it is extremely difficult to transmit a wavelength of 350 to 480 nm. Therefore, based on this characteristic, a light source having a wavelength peak value within a band of 350 to 480 nm is used. Thereby, it is possible to irradiate the pearl ink printing portion with light having an optimal wavelength. In some cases, even in a pearl ink detection device using a light source having such a wavelength peak, a wavelength transmission filter having a wavelength transmission band of 350 to 480 nm is disposed between the light source and the light receiving element. You may.
[0010]
Also, amplifying means for amplifying the output from the light receiving element, integrating means for converting the signal output from the amplifying means into an integrated wave, and comparing the output signal from the amplifying means with the output signal from the integrating means to obtain a pearl ink. It is preferable to include a comparison unit that sends a determination signal of the printing unit. By adopting such a configuration, the determination signal can be transmitted from the pearl ink detection device with a simple configuration, and the device itself is simplified and the convenience is improved.
[0011]
The pearl ink detection device method according to the present invention is a method for detecting a pearl ink printed portion of a sheet printed using an ink containing a pearl pigment, wherein light emitted from a light source is wavelength-limited by a wavelength transmission filter. After that, the light is irradiated to the pearl ink printing part, and the light transmitted through the pearl ink printing part is received by the light receiving element facing the light source.
[0012]
The method for detecting pearl ink according to the present invention is a method for detecting a pearl ink printed portion of a sheet printed using an ink containing a pearl pigment, wherein light that hardly passes through the pearl ink printed portion is pearled from a light source. The light is irradiated toward the ink printing section, and the light transmitted through the pearl ink printing section is received by the light receiving element facing the light source.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a pearl ink detection device and a pearl ink detection method according to the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a cross-sectional view showing a paper sheet inspecting apparatus 1. The inspection object of the sheet inspecting apparatus 1 is to determine the authenticity of a bill, which is an example of a paper sheet. Specifically, it is a discrimination between a counterfeit banknote that has been color-copied and a legitimate banknote, and this color copy sheet contains a large amount of fluorescent components. Further, in the 2000 yen bill, there is a part printed with pearl ink as one of the countermeasures against forgery, which is disclosed in the “Ministry of Finance Printing Bureau homepage“ Technique for preventing forgery of bills ””.
[0015]
As shown in FIG. 1, the paper sheet inspection device 1 is provided with a linear transport path 4 formed so as to be sandwiched between upper and lower guide plates 2, 3. , Transport rollers 5 and 6 are arranged, and the transport rollers 5 and 6 reliably transport the bill R toward the discharge side. A bill recognition device (not shown) is arranged in the middle of the transport passage 4.
[0016]
This bill recognition device has a structure in which a bill R is illuminated by an LED light source and light reflected from the bill R is captured by a CCD camera. Then, the image captured by the camera is compared with known image data to determine the denomination of the bill. However, in recent years, due to the high precision of color copying, it has become difficult to determine the authenticity of the banknote R by image recognition alone. Therefore, a paper sheet fluorescence detection sensor (not shown) is arranged on the upstream side of the bill recognition device. The paper sheet fluorescence detection sensor irradiates the banknote R with ultraviolet light, receives fluorescence emitted from the counterfeit banknote R by a fluorescent light receiving element, and determines the type, authenticity, and the like of the banknote R.
[0017]
In recent years, as a countermeasure to prevent forgery, pearl ink has been employed in a part of printing of the banknote R, and the pearl ink printed portion P is glossy and can be visually checked. Specifically, a 2000-yen bill (see FIG. 3) looks pink when viewed from a certain angle. Also, pearl inks are known, and light absorption, scattering, and reflection can be varied depending on the thickness, fineness, particle distribution, and the like of natural mica, thereby creating various glitters. Further, in printing with pearl ink, various colors such as silver, yellow, red, blue, and green appear due to the difference in thickness of titanium dioxide as a pigment. There are various pigments used as pearl inks, and the coloring can be made different depending on the pigment. Examples of the technology relating to pearl ink include JP-A-09-240133, JP-A-09-267592, JP-A-2002-285061, "Latest technology of functional ink" (CMC Publishing Co., Ltd.) and the like. .
[0018]
The pearl ink printing section P that shines under fluorescent light or natural light is used for the purpose of preventing forgery of the banknote R, and in a 2,000 yen bill (see FIG. 3), when viewed from a certain angle by visual observation. You can see the coloring. In such a case, the pearl ink printing portion P is checked while turning the banknote R at various angles, and the checking operation by visual observation is complicated.
[0019]
Therefore, various experiments were performed to enable mechanical discrimination of the pearl ink printing portion P of the 2,000 yen bill, and as a result, it was found that the pearl ink printing portion P was extremely difficult to transmit blue light to ultraviolet light. It has been found by the inventors to have properties. Specifically, it is extremely difficult for the pearl ink printing unit P to transmit light (hereinafter, referred to as “blue-violet light”) from 350 to 480 nm in the visible light region to the ultraviolet light region. Invented.
[0020]
The pearl ink detecting device 10 shown in FIG. 2 has a substantially rectangular parallelepiped housing 11 fixed to the upper guide plate 2 so that the above-described paper sheet inspection device 1 can be arranged in the middle of the transport path 4. . A blue-violet LED (light source) 12 for irradiating blue-violet light from directly above toward the transport path 4 is accommodated in the housing 11. The LED 12 is fixed to a drive circuit board 13 attached to the housing 11 so as to be suspended via a lead portion 12a. The LED 12 is selected to have a wavelength peak value within a band of 350 to 480 nm so as to match the characteristics of the pearl ink. On the lower surface of the housing 11, a dust-proof glass plate 14 arranged so as to face the transport passage 4 is fixed via an adhesive, and the dust-proof glass plate 14 is made of glass that easily transmits blue-violet light. ing.
[0021]
Further, a wavelength transmission filter 16 is fixed in the housing 11 between the LED 12 and the dustproof glass plate 14 via an adhesive. The wavelength transmission filter 16 having a wavelength transmission band of 350 to 480 nm is used. When this filter 16 is used, in consideration of cost and the like, even if an LED having a wide wavelength band is used, it is possible to limit the wavelength and cut off an extra light component included in the light wavelength component. Accordingly, it is possible to reliably irradiate the pearl ink printing portion P with appropriate light.
[0022]
Further, the pearl ink detecting device 10 has a substantially rectangular parallelepiped housing 21 for accommodating a light receiving element 22 composed of a photosensor. The housing 21 is fixed to the lower guide plate 3 and has a light source side. It is arranged facing the housing 11. The housing 21 houses a light receiving element 22 for receiving light emitted from the LED 12 and transmitted through the pearl ink printing unit P. The light receiving element 22 includes a driving circuit board 23 attached to the housing 21. Is fixed via a lead portion 22a. In addition, a dustproof glass plate 24 arranged to face the transport passage 4 is fixed to the upper surface of the housing 21 via an adhesive.
[0023]
Here, if the light receiving wavelength band of the light receiving element 22 covers only 350 to 480 nm, for example, even if the pearl ink printing part P is forged with a highlighter pen, the amount of light received by the light receiving element 22 is extremely reduced. As a result, it is difficult to determine the authenticity. Therefore, in view of the characteristic that the fluorescent ink emits fluorescence when irradiated with blue-violet light, it is preferable that the light receiving element 22 be capable of receiving ultraviolet light, visible light, and infrared light in a wide range. That is, by not limiting the light receiving wavelength band to only blue-violet light, a wide variety of counterfeiting prevention measures can be realized. The color copy paper used for counterfeiting itself contains a large amount of fluorescent components, and emits a large amount of fluorescent light when irradiated with blue-violet light.
[0024]
Using such a light receiving element 22 and the blue-violet LED 12, an experiment was performed while scanning a 2,000-yen bill (see FIG. 3) in the direction of arrow A so as to pass over the pearl ink printing portion P, and the result is shown in FIG. As described above, it was found that the amount of received light was significantly reduced over the entire length of the pearl ink printing portion P, which indicates that the pearl ink printing portion P was extremely difficult to transmit the light having the above-described specific wavelength. On the other hand, as shown in FIG. 5, an experiment was performed using a generally used green LED having a wavelength peak value of about 550 nm while scanning a 2,000-yen bill (see FIG. 3) in the direction of arrow A. It can be seen that the amount of light received in the pearl ink printing portion P changes irregularly, but no characteristic phenomenon is found in the change in the amount of received light.
[0025]
As can be seen from FIG. 4, blue-violet light hardly passes through the pearl ink printing portion P, and a phenomenon in which the amount of received light drops extremely is found. In view of such a received light waveform, the pearl ink detection device 10 By using the simple determination circuit 26, it is possible to output a signal indicating whether or not the pearl ink printing section P exists (a determination signal). For example, the discriminating circuit 26 includes an amplifying circuit (amplifying means) 27 for amplifying a weak output from the light receiving element 22, an integrating circuit 28 for converting a signal output from the amplifying circuit 27 into an integrated wave, and an amplifying circuit 27. And an comparing circuit 29 for comparing the output signal of the integrating circuit 28 with the output signal of the integrating circuit 28 and sending out a discrimination signal.
[0026]
Therefore, since the signal output from the light receiving element 22 is weak and has a waveform close to a rectangular wave, the signal is amplified by the amplifier circuit 27, and an integrated waveform is generated in step 1 (S1). Next, by comparing the output from the amplifying circuit 27 and the output from the integrating circuit 28 in step 2, a mere presence / absence signal (determination signal) can be output from the comparing circuit 29. As described above, the presence / absence of the pearl ink printing unit P can be determined with a very simple circuit configuration, and the convenience of the pearl ink detection device 10 itself is improved. For example, when the pearl ink printing portion P is detected, it is preferable that a signal is issued from the comparison circuit 29.
[0027]
The present invention is not limited to the embodiments described above. For example, the paper sheets are not limited to banknotes, but may be cash vouchers such as gift certificates, cards, certificates, securities, and the like. A black light can be used as a light source.
[0028]
Further, in the present embodiment, the ink used for the pearl ink printing portion P on the paper sheet R has difficulty in transmitting light having a wavelength of 350 to 480 nm. Depending on the characteristics, light may not be easily transmitted in a wavelength band other than the above-described wavelength band, and accordingly, a light source or a wavelength transmission filter corresponding to this may be used.
[0029]
【The invention's effect】
Since the pearl ink detection device according to the present invention is configured as described above, the following effects are obtained. That is, a device for detecting a pearl ink printed portion of a paper sheet printed using an ink containing a pearl pigment, which is housed in a housing and emits light toward the pearl ink printed portion of the paper sheet. A light source, a light receiving element disposed opposite to the light source and receiving light transmitted through the pearl ink printing unit, and a light transmitting element disposed between the light source and the light receiving element and having a wavelength transmission band of 350 to 480 nm. By providing a certain wavelength transmission filter in the band, it is possible to detect a pearl ink printed portion on a paper sheet with a very simple configuration.
[0030]
Further, the pearl ink detecting device according to the present invention is a device for detecting a pearl ink printed portion of a paper sheet printed using an ink containing a pearl pigment, and is accommodated in a housing and has a pearl ink value. The light source includes a light source that emits light toward the ink printing unit, and a light receiving element that is disposed to face the light source and receives light transmitted through the pearl ink printing unit. The light source has a wavelength peak value of 350 to 480 nm. , It is possible to detect a pearl ink printed portion on a paper sheet with a very simple configuration.
[0031]
Further, the pearl ink detection method according to the present invention is a method for detecting a pearl ink printed portion of a sheet printed using an ink containing a pearl pigment, wherein light emitted from a light source is wavelength-limited by a wavelength transmission filter. After irradiating the pearl ink printing section with the light receiving element facing the light source and receiving the light transmitted through the pearl ink printing section, it is possible to detect the pearl ink printing section on paper sheets, and the device configuration is simple. Become.
[0032]
Further, the pearl ink detection method according to the present invention is a method for detecting a pearl ink printed portion of a sheet printed using an ink containing a pearl pigment. By irradiating toward the ink printing unit and receiving the light transmitted through the pearl ink printing unit with the light receiving element facing the light source, it is possible to detect the pearl ink printing unit on paper sheets, and the device configuration is simplified. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a paper sheet inspection device to which a pearl ink detection device according to the present invention is applied.
FIG. 2 is a cross-sectional view showing one embodiment of a pearl ink detection device according to the present invention.
FIG. 3 is a front view showing a 2,000-yen bill.
FIG. 4 is a graph showing a change in a voltage output from a light receiving element when a banknote is irradiated with blue-violet light.
FIG. 5 is a graph showing a change in voltage output from a light receiving element when a banknote is irradiated with visible light.
FIG. 6 is a diagram showing a discrimination circuit applied to the pearl ink detection device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Pearl ink detection apparatus, 11 ... Case, 12 ... LED (light source), 16 ... Wavelength transmission filter, 22 ... Light receiving element, 27 ... Amplifying circuit (amplifying means), 28 ... Integrating circuit (Integrating means), 29 ... Comparison circuit (comparing means), R: banknotes (sheets), P: pearl ink printing unit.

Claims (5)

パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する装置であって、
筐体内に収容されると共に、前記紙葉類の前記パールインキ印刷部に向けて光を出射する光源と、
前記光源に対向して配置されると共に、前記パールインキ印刷部を透過した光を受光する受光素子と、
前記光源と前記受光素子との間に配置されると共に、波長透過帯域が３５０〜４８０ｎｍの帯域内にある波長透過フィルタとを備えたことを特徴とするパールインキ検出装置。An apparatus for detecting a pearl ink printed portion of a sheet printed using an ink containing a pearl pigment,
A light source that is housed in the housing and emits light toward the pearl ink printing unit of the paper sheet,
A light receiving element that is arranged to face the light source and receives light transmitted through the pearl ink printing unit,
A pearl ink detection device, comprising: a wavelength transmission filter disposed between the light source and the light receiving element and having a wavelength transmission band within a band of 350 to 480 nm. パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する装置であって、
筐体内に収容されると共に、前記紙葉類の前記パールインキ印刷部に向けて光を出射する光源と、
前記光源に対向して配置されると共に、前記パールインキ印刷部を透過した光を受光する受光素子とを備え、
前記光源は、波長ピーク値が３５０〜４８０ｎｍの帯域内に入っていることを特徴とするパールインキ検出装置。An apparatus for detecting a pearl ink printed portion of a sheet printed using an ink containing a pearl pigment,
A light source that is housed in the housing and emits light toward the pearl ink printing unit of the paper sheet,
A light-receiving element arranged to face the light source and receiving light transmitted through the pearl ink printing unit,
The pearl ink detecting device, wherein the light source has a wavelength peak value within a band of 350 to 480 nm. 前記受光素子からの出力を増幅する増幅手段と、
前記増幅手段からの信号出力を積分波に変換する積分手段と、
前記増幅手段からの出力信号と前記積分手段からの出力信号とを比較して前記パールインキ印刷部の判定信号を送出する比較手段とを備えたことを特徴とする請求項１又は２記載のパールインキ検出装置。Amplifying means for amplifying the output from the light receiving element;
Integrating means for converting a signal output from the amplifying means into an integrated wave;
3. The pearl according to claim 1, further comprising a comparison unit that compares an output signal from the amplification unit and an output signal from the integration unit and sends a determination signal of the pearl ink printing unit. Ink detector. パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する方法であって、
光源から出射した光を、波長透過フィルタで波長制限した後に前記パールインキ印刷部に照射し、前記光源に対向した受光素子で前記パールインキ印刷部を透過した光を受光することを特徴とするパールインキ検出方法。A method for detecting a pearl ink printed portion of a paper sheet printed using an ink containing a pearl pigment,
The light emitted from the light source, the wavelength of which is limited by a wavelength transmission filter, is irradiated on the pearl ink printing unit, and the light transmitted through the pearl ink printing unit is received by a light receiving element facing the light source, wherein the pearl is received. Ink detection method. パール顔料を含むインキを用いて印刷した紙葉類のパールインキ印刷部を検出する方法であって、
前記パールインキ印刷部を透過しにくい光を光源から前記パールインキ印刷部に向けて照射し、前記光源に対向した受光素子で前記パールインキ印刷部を透過した光を受光することを特徴とするパールインキ検出方法。A method for detecting a pearl ink printed portion of a paper sheet printed using an ink containing a pearl pigment,
A pearl which irradiates light hard to transmit through the pearl ink printing unit from a light source toward the pearl ink printing unit, and receives light transmitted through the pearl ink printing unit by a light receiving element facing the light source. Ink detection method.
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Cited By (12)

* Cited by examiner, † Cited by third party
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JP2007026066A (en) * 2005-07-15 2007-02-01 Toshiba Corp Paper sheet authenticity discrimination device
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