JP4264776B2

JP4264776B2 - Safety protection sheet, authenticity determination method thereof, and authenticity determination device thereof

Info

Publication number: JP4264776B2
Application number: JP10805599A
Authority: JP
Inventors: 繁三内堀; 泰正川口
Original assignee: 独立行政法人国立印刷局
Priority date: 1999-04-15
Filing date: 1999-04-15
Publication date: 2009-05-20
Anticipated expiration: 2019-04-15
Also published as: JP2000296687A

Description

【０００１】
【発明の属する技術分野】
本発明は、偽造される可能性がある株券、証書、商品券、入場券、通帳等の有価証券類、パスポート、身分証明書、あるいは他の書類に用いる安全保護シート及びその真偽判別方法並びにその真偽判別装置に関するものである。
【０００２】
【従来の技術】
有価証券類などに用いる用紙に偽造防止機能を付与する方法として、過去に種々の方法が考案されてきた。この中でも蛍光又は残光を示す蛍光物質を利用した方法は広く用いられており、用紙表面に該物質を含有する印刷インキでの網版及び線画印刷方式あるいは塗料での塗布方式によって付与された画像を特定光源下で視認する方法が代表的なものである。
【０００３】
また、特開平３−１６６２７６号に、不乾性油等に無色又は淡色の蛍光物質を付与することで、透かし模様と発光模様の両方が得られるインキが開示されている。このような透明若しくは淡色の蛍光インキを用いることで、可視光反射照明下では図柄が認識しにくく、特定光源下でのみ認識可能な隠し図柄を付与することが可能である。
【０００４】
【発明が解決しようとする課題】
しかし、蛍光又は残光を示す蛍光物質を利用する方法は比較的一般化した方法であり、近年の市販品として蛍光物質及び蛍光インキが入手可能な状況下においては、単に基材表層に付与した蛍光物質の発光を利用しただけでは偽造防止法としての優位性を維持することが困難となってきている。また、透明若しくは淡色の蛍光インキで隠し図柄を付与する方法では、インキの樹脂分の影響による光沢等の違いにより完全な隠し図柄とすることが難しく、流通時に光等に晒されることで印刷部分が黄変し、隠し図柄の効果は低下してしまうなどの問題点があった。
【０００５】
そこで、本発明は、上記のような問題点を解消するためになされたもので、特定光源下でのいずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、少なくともいずれかの一つに異なる光学的効果を与えることにより、偽造防止効果を高めるとともに、機械による読み取り、判別を可能とし、しかも耐久性に優れた安全保護シート及びその真偽判別方法並びにその真偽判別装置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】
上記の目的を達成するために、まず、請求項１に係る発明の安全保護シートは、シート状基材を積層した層間に蛍光物質を配し、少なくとも一方のシート状基材に透かしを設けた安全保護シートである。
【０００７】
また、請求項２に係る発明の安全保護シートは、シート状基材を積層した層間に蛍光物質を配し、少なくとも一方のシート状基材の表層の一部を除去した安全保護シートである。
【０００８】
また、本発明の安全保護シートは、それぞれ異なる発光色を有する蛍光物質を片面に付与したシート状基材同士を、その蛍光物質付与面を内側にして積層した安全保護シートである。
【０００９】
また、請求項３に係る発明の安全保護シートは、それぞれ異なる発光色を有する蛍光物質を片面に付与したシート状基材同士を、少なくとも一方の蛍光物質付与面の一部を不透明物質層で隠蔽し、その蛍光物質付与面を内側にして積層した安全保護シートである。
【００１０】
また、請求項４に係る発明の安全保護シートは、それぞれ異なる発光色を有する蛍光物質の一方がシート状基材片面の全面に、他方がシート状基材片面の一部に（所望の図柄を形成するように）配された安全保護シートである。
【００１１】
また、請求項５に係る発明の安全保護シートは、シート状基材を積層した層間に蛍光物質を配し、一方のシート状基材と蛍光物質層との層間の少なくとも一部に不透明物質層を配置した安全保護シートである。
【００１２】
また、請求項６に係る発明の安全保護シートは、シート状基材を積層した層間に蛍光物質を配し、前記シート状基材と蛍光物質層との各層間に、図柄の異なる不透明物質層を配置した安全保護シートである。
【００１３】
また、請求項７又は請求項８に係る発明の安全保護シートは、特定光源下でいずれか一方のシート状基材側の反射光と透過光、他方のシート状基材側の反射光で観察した時、少なくともいずれか一つの観察画像が異なる光学的効果を有する安全保護シートである。
【００１４】
また、請求項９に係る発明の安全保護シートの真偽判別方法は、安全保護シートのいずれか一方のシート状基材側と他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取り、予め記録されている蛍光発光データと比較して真偽判別することを特徴とする安全保護シートの真偽判別方法である。
【００１５】
また、請求項１０に係る発明の安全保護シートの真偽判別方法は、安全保護シートのいずれか一方のシート状基材側の特定光源下での蛍光発光を透過光で読み取り、且つ、他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取り、予め記録されている蛍光発光データと比較して真偽判別することを特徴とする安全保護シートの真偽判別方法である。
【００１６】
また、請求項１１に係る発明の安全保護シートの真偽判別方法は、安全保護シートのいずれか一方のシート状基材側の特定光源下での蛍光発光を反射光及び透過光で読み取り、且つ、他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取り、予め記録されている蛍光発光データと比較して真偽判別することを特徴とする安全保護シートの真偽判別方法である。
【００１７】
また、請求項１２の係る発明の安全保護シートの真偽判別装置は、安全保護シートのいずれか一方のシート状基材側と他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取って前記安全保護シートを真偽判別する装置であって、前記安全保護シートの一方のシート状基材側に設けられた特定波長の光を照射する第一の特定光照射手段と、他方のシート状基材側に設けられた特定波長の光を照射する第二の特定光照射手段と、前記第一及び第二の特定光照射手段により特定波長の光を照射した時に前記安全保護シートから反射された蛍光発光をそれぞれ感知して読み取り信号に変換する第一及び第二の蛍光感知手段と、前記第一及び第二の蛍光感知手段からのそれぞれの前記読み取り信号を処理して前記蛍光発光の色調とパターンに関する読み取り情報とする信号処理手段とから構成される読み取り装置と、前記読み取り装置から受け取ったそれぞれの前記読み取り情報を予め格納された真正物である安全保護シートによって得られる蛍光発光の色調とパターンに関する読み取り情報と比較して前記安全保護シートの真偽判別の結果を出力する情報比較手段とを有する安全保護シートの真偽判別装置である。
【００１８】
また、請求項１３に係る発明の安全保護シートの真偽判別装置は、安全保護シートのいずれか一方のシート状基材側の特定光源下での蛍光発光を透過光で読み取り、且つ、他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取って前記安全保護シートを真偽判別する装置であって、前記安全保護シートの一方のシート状基材側に設けられた特定波長の光を照射する特定光照射手段と、前記特定光照射手段により特定波長の光を照射した時に前記安全保護シートから透過及び反射された蛍光発光をそれぞれ感知して読み取り信号に変換する第一及び第二の蛍光感知手段と、前記第一及び第二の蛍光感知手段からのそれぞれの前記読み取り信号を処理して前記蛍光発光の色調とパターンに関する読み取り情報とする信号処理手段とから構成される読み取り装置と、前記読み取り装置から受け取ったそれぞれの前記読み取り情報を予め格納された真正物である安全保護シートによって得られる蛍光発光の色調とパターンに関する読み取り情報と比較して前記安全保護シートの真偽判別の結果を出力する情報比較手段とを有する安全保護シートの真偽判別装置である。
【００１９】
また、請求項１４に係る発明の安全保護シートの真偽判別装置は、安全保護シートのいずれか一方のシート状基材側の特定光源下での蛍光発光を反射光及び透過光で読み取り、且つ、他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取って前記安全保護シートを真偽判別する装置であって、前記安全保護シートの一方のシート状基材側に設けられた特定波長の光を照射する第一の特定光照射手段と、他方のシート状基材側に設けられた特定波長の光を照射する第二の特定光照射手段と、前記第一の特定光照射手段により特定波長の光を照射した時に前記安全保護シートから反射された蛍光発光を感知して読み取り信号に変換する第一の蛍光感知手段と、前記第二の特定光照射手段により特定波長の光を照射した時に前記安全保護シートから透過された蛍光発光を感知して読み取り信号に変換する第二の蛍光感知手段と、前記第二の特定光照射手段により特定波長の光を照射した時に前記安全保護シートから反射された蛍光発光を感知して読み取り信号に変換する第三の蛍光感知手段と、前記第一及び第二並びに第三の蛍光感知手段からのそれぞれの前記読み取り信号を処理して前記蛍光発光の色調とパターンに関する読み取り情報とする信号処理手段とから構成される読み取り装置と、前記読み取り装置から受け取ったそれぞれの前記読み取り情報を予め格納された真正物である安全保護シートによって得られる蛍光発光の色調とパターンに関する読み取り情報と比較して前記安全保護シートの真偽判別の結果を出力する情報比較手段とを有する安全保護シートの真偽判別装置である。
【００２０】
【発明の実施の形態】
本発明の安全保護シートは、特定光源、例えば紫外線又は赤外線の励起光下で蛍光発光を生じる蛍光物質をシート状基材の層間に付与することで、単純に表層に透明又は淡色の蛍光インキで図柄を付与するよりも隠し図柄として容易に隠蔽を可能とし、しかも流通時に光等に晒されても図柄部分の黄変などが少ない耐久性に優れた構造となっている。
【００２１】
また、本発明の安全保護シートにおいては、前記シート状基材として紙、合成紙、プラスチックシートなどを適宜、選択して用いることができるが、透き入れ紙使用、表層の一部除去、不透明物質による隠蔽層の付与などの手法を用いることで、単純に表層に透明又は淡色の蛍光インキで図柄を付与するだけでは得ることのできない光学的効果、すなわち、特定光源下において安全保護シートをいずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時に、少なくともいずれかの一つが異なった光学的効果をもつように安全保護シートを構成することによって偽造に対する抵抗力を高めている。
【００２２】
更に、このように、特定光源下において安全保護シートをいずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時に、少なくともいずれかの一つが異なる光学的効果を奏するという作用、効果は、目視による真偽の判定のみならず、機械による真偽の判定にも応用が可能であり、
（ａ）安全保護シートのいずれか一方の面側と他方の面側の蛍光発光をそれぞれ反射光で、
（ｂ）安全保護シートのいずれか一方の面側の蛍光発光を透過光で、且つ、他方の面側の蛍光発光を反射光で、
（ｃ）安全保護シートのいずれか一方の面側の蛍光発光を反射光及び透過光で、且つ、他方の面側の蛍光発光を反射光で、
必要に応じてフィルタを介してセンサーで読み取り、予め記録されている真正物の安全保護シートによって得られる蛍光発光のデータと比較、照合することによって、真偽を判別することができる。
【００２３】
なお、本発明の安全保護シートを真偽判別するにあたって参照すべき透過光画像としては、いずれか一方の面側での透過光画像を用いれば十分である。
【００２４】
【実施例】
以下、本発明の実施例について図面を参照して詳細に説明する。なお、以下に示す実施例においては、シート状基材として紙又は合成紙を用いる例を示すが、この場合の紙又は合成紙からなる基材は、基材層を通して蛍光発光が確認できる不透明度とする必要があり、基材自体が蛍光発光を持たないことが望ましいが、これ以外に繊維の種類、紙料配合、内添剤の種類及び添加量等による制約はない。また、シート状基材として必要に応じてプラスチックシートなどの合成樹脂シートを用いることもできる。
【００２５】
（実施例１）
図１は、本発明の第１の実施例による安全保護シートの構成例を示す断面図である。本実施例の安全保護シートは、図１に示すように、網出し法による抄紙等により透き入れ画像（２）を有する紙又は合成紙からなる基材（１）の片面に蛍光インキ（例えば、紫外線励起型グリーンNo.３、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度のベタ刷りを行い、蛍光物質層（３）が形成される。前記基材（１）と別の紙又は合成紙からなる基材（４）を、接着剤等を用いて蛍光物質層（３）が内側になるように積層、結合する。
【００２６】
このようにして構成された安全保護シートを３６５ｎｍの紫外光を光源として観察した場合、透き入れを有する基材（１）面側の反射光又は透過光による観察では、透き入れ部で透過光量に差が生ずるため、繊維密度が高い部分では透過光量が少ないので緑色蛍光の強さが弱く、逆に繊維密度の低い部分では透過光量が多いので緑色蛍光の強さが強くなるため、透き入れ画像（２）が蛍光発光による画像として認識できる。
【００２７】
一方、透き入れを持たない基材（４）面側の反射光による観察では、基材（４）を透過する光量がほぼ等しいため、緑色蛍光の強さも全面ほぼ等しく認識されるか、又は、基材（１）から反射する光量の影響により、基材（１）の繊維密度の高い部分では反射光量が多いので緑色蛍光の強さが強く、繊維密度の低い部分では反射光量が少ないので緑色蛍光の強さが弱くなり、基材（１）面側の反射光又は透過光画像のネガ、ポジを反転した画像として認識される。
【００２８】
すなわち、紫外光に対して、いずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、少なくともいずれかの一つが異なる光学的効果を有する安全保護シートが得られる。
【００２９】
（実施例２）
図２は、本発明の第２の実施例による安全保護シートの構成例を示す断面図である。本実施例の安全保護シートは、図２に示すように、紙又は合成紙からなる基材（４）又は（５）のどちらか一方の片面に蛍光インキ（例えば、紫外線励起型グリーンNo.３、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度のベタ刷りを行い、蛍光物質層（３）を形成し、接着剤等を用いて蛍光物質層（３）が内側になるように基材（４）と基材（５）を積層、結合する。この積層基材の一部を、例えばレーザー加工等の方法を用いて、図柄となる基材除去部（６）として形成する。
【００３０】
このようにして構成された安全保護シートを３６５ｎｍの紫外光を光源として観察した場合、基材除去部（６）を有する基材（５）面側の反射光又は透過光による観察では、基材除去部（６）の緑色蛍光の強さが強くなるため、基材除去部（６）によって施された図柄が蛍光発光による画像として認識できる。
【００３１】
一方、基材（４）面側の反射光による観察では、基材（４）を透過する光量がほぼ等しいため、緑色蛍光の強さも全面ほぼ等しく認識されるか、又は、基材除去部（６）から反射する光量の減少により、緑色蛍光の強さが弱くなり、基材（５）面側の反射光又は透過光画像のネガ、ポジを反転した画像として認識される。
【００３２】
すなわち、紫外光に対して、いずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、少なくともいずれかの一つが異なる光学的効果を有する安全保護シートが得られる。
【００３３】
（実施例３）
図３は、本発明の第３の実施例による安全保護シートの構成例を示す断面図である。本実施例の安全保護シートは、図３に示すように、紙又は合成紙からなる基材（４）の片面に蛍光インキ（例えば、紫外線励起型グリーンNo.３、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度のベタ刷りを行い、蛍光物質層（３）が形成される。また、別の紙又は合成紙からなる基材（７）の片面に蛍光インキ（例えば、紫外線励起型ブルーNo.１、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度の印刷を行い、蛍光物質層（８）なる図柄が形成される。この基材（４）及び（７）を、接着剤等を用いて蛍光物質層（３）及び（８）が内側になるように積層、結合する。
【００３４】
このようにして構成された安全保護シートを３６５ｎｍの紫外光を光源として観察した場合、基材（４）面側の反射光による観察では、蛍光物質層（３）の蛍光発光が強く現れ、緑色発光が認識できる。
【００３５】
一方、基材（７）面側の反射光による観察では、地色としての蛍光物質層（３）の緑色発光中に、図柄としての蛍光物質層（８）の青色発光が認識できる。また、基材（４）面側の透過光による観察では、地色としての蛍光物質層（３）の緑色発光中に、図柄として蛍光物質層（８）の青色と蛍光物質層（３）の緑色を混色した発光が認識できる。
【００３６】
すなわち、紫外光に対して、いずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、それぞれが互いに異なる光学的効果を有する安全保護シートが得られる。
【００３７】
（実施例４）
図４は、本発明の第４の実施例による安全保護シートの構成例を示す断面図である。本実施例の安全保護シートは、図４に示すように、紙又は合成紙からなる基材（４）の片面に蛍光インキ（例えば、紫外線励起型グリーンNo.３、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度のベタ刷りを行い、蛍光物質層（３）が形成される。更に、その蛍光物質層の上から、隠蔽力の高いインキ（例えば、二酸化チタンを主体顔料とした基材と同等色のインキ）でインキ皮膜厚さ１〜３μｍ程度の印刷を行い、不透明物質層（９）なる図柄が形成される。また、別の紙又は合成紙からなる基材（７）の片面に蛍光インキ（例えば、紫外線励起型ブルーNo.１、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度の印刷を行い、蛍光物質層（８）なる図柄が形成される。この基材（４）及び（７）を、接着剤等を用いて前記蛍光物質層（３）及び（８）が内側になるように積層、結合する。
【００３８】
このようにして構成された安全保護シートを３６５ｎｍの紫外光を光源として観察した場合、基材（４）面側の反射光による観察では、蛍光物質層（３）の蛍光発光が強く現れ、緑色発光が認識できる。
【００３９】
一方、基材（７）面側の反射光による観察では、図柄構成によっては、不透明物質層（９）で一部隠蔽された地色としての蛍光物質層（３）の緑色発光中に、図柄としての蛍光物質層（８）の青色発光が認識できる。また、基材（７）面側又は基材（４）面側の透過光による観察では、地色としての蛍光物質層（３）の緑色発光中に、図柄として蛍光物質層（８）の青色と蛍光物質層（３）の緑色を混色した発光が、不透明物質層（９）で一部隠蔽されて認識できる。
【００４０】
すなわち、紫外光に対して、いずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、それぞれが互いに異なる光学的効果を有する安全保護シートが得られる。
【００４１】
（実施例５）
図５は、本発明の第５の実施例による安全保護シートの構成例を示す断面図である。本実施例の安全保護シートは、図５に示すように、紙又は合成紙からなる基材（４）の片面に蛍光インキ（例えば、紫外線励起型グリーンNo.３、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度のベタ刷りを行い、蛍光物質層（３）が形成される。また、別の紙又は合成紙からなる基材（７）の片面若しくは基材（４）の蛍光物質層の上から、隠蔽力の高いインキ（例えば、二酸化チタンを主体顔料とした基材と同等色のインキ）でインキ皮膜厚さ１〜３μｍ程度の印刷を行い、不透明物質層（９）なる図柄を形成し、基材（４）及び（７）を、接着剤等を用いて蛍光物質層（３）及び不透明物質層（９）が内側になるように積層、結合する。
【００４２】
このようにして構成された安全保護シートを３６５ｎｍの紫外光を光源として観察した場合、基材（４）面側の反射光による観察では、蛍光物質層（３）の蛍光発光により緑色発光が認識できる。
【００４３】
一方、基材（７）面側の反射光及び透過光による観察では、不透明物質層（９）で一部隠蔽された蛍光物質層（３）の緑色発光が認識できる。
【００４４】
すなわち、紫外光に対して、いずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、少なくともいずれかの一つが異なる光学的効果を有する安全保護シートが得られる。
【００４５】
（実施例６）
図６は、本発明の第６の実施例による安全保護シートの構成例を示す断面図である。本実施例の安全保護シートは、図６に示すように、紙又は合成紙からなる基材（４）の片面に隠蔽力の高いインキ（例えば、二酸化チタンを主体顔料とした基材と同等色のインキ）でインキ皮膜厚さ１〜３μｍ程度の印刷を行い、不透明物質層（９ｂ）なる図柄を形成し、その上から蛍光インキ（例えば、紫外線励起型グリーンNo.３、大日本インキ化学工業（株）製等）でインキ皮膜厚さ１〜３μｍ程度のベタ刷りを行い、蛍光物質層（３）が形成される。更に、別の紙又は合成紙からなる基材（７）の片面若しくは基材（４）の蛍光物質層の上から、隠蔽力の高いインキ（例えば、二酸化チタンを主体顔料とした基材と同等色のインキ）でインキ皮膜厚さ１〜３μｍ程度の印刷を行い、不透明物質層（９ａ）なる図柄を形成した後、基材（４）及び（７）を、接着剤等を用いて不透明物質層（９ａ）及び（９ｂ）並びに蛍光物質層（３）が内側になるように積層、結合する。
【００４６】
このようにして構成された安全保護シートを３６５ｎｍの紫外光を光源として観察した場合、基材（４）面側の反射光による観察では、不透明物質層（９ｂ）で一部隠蔽された蛍光物質層（３）の緑色発光が認識できる。
【００４７】
一方、基材（７）面側の反射光による観察では、不透明物質層（９ａ）で一部隠蔽された蛍光物質層（３）の緑色発光が認識できる。また、基材（７）面側又は基材（４）面側の透過光による観察では、不透明物質層（９ａ）及び（９ｂ）の合成図柄で一部隠蔽された蛍光物質層（３）の緑色発光が認識できる。
【００４８】
すなわち、紫外光に対して、いずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、それぞれが互いに異なる光学的効果を有する安全保護シートが得られる。
【００４９】
（実施例７）
図７は、本発明の第７の実施例による安全保護シートの真偽判別方法の例を示す概要図である。本実施例の安全保護シートの真偽判別方法は、図７に示すように、安全保護シート（１０）のいずれか一方の面側の特定光源（１１ａ）からの反射光での蛍光発光を、必要に応じてフィルタ（１２ａ）を介してセンサー（１３ａ）で読み取り、同様に安全保護シート（１０）の他方の面側の特定光源（１１ｂ）からの反射光での蛍光発光を、必要に応じてフィルタ（１２ｂ）を介してセンサー（１３ｂ）で読み取る。この２つの蛍光発光データを予め記録されている蛍光発光データと比較することで真偽の判別を行う。
【００５０】
本真偽判別方法では、安全保護シートのいずれか一方の面側と他方の面側の反射光での蛍光発光の違いを読み取ることを特徴としているため、単にシート状基材の表層に蛍光物質を付与して偽造するだけでは容易に偽物として見破られてしまい、片面の蛍光発光データによる真偽判別よりも精度よく真偽を判別することが可能である。
【００５１】
（実施例８）
図８は、本発明の第８の実施例による安全保護シートの真偽判別方法の例を示す概要図である。本実施例の安全保護シートの真偽判別方法は、図８に示すように、安全保護シート（１０）のいずれか一方の面側の特定光源（１１）からの透過光での蛍光発光を、必要に応じてフィルタ（１２ａ）を介してセンサー（１３ａ）で読み取り、同様に前記特定光源（１１）からの反射光での蛍光発光を必要に応じてフィルタ（１２ｂ）を介してセンサー（１３ｂ）で読み取る。この２つの蛍光発光データを予め記録されている蛍光発光データと比較することで真偽の判別を行う。
【００５２】
本真偽判別方法では、安全保護シートのいずれか一方の面側の透過光と他方の面側の反射光での蛍光発光の違いを読み取ることを特徴としているため、単にシート状基材の表層に蛍光物質を付与して偽造するだけでは容易に偽物として見破られてしまい、片面の蛍光発光データによる真偽判別よりも精度よく真偽を判別することが可能である。
【００５３】
（実施例９）
図９は、本発明の第９の実施例による安全保護シートの真偽判別装置の例を示す構成図である。本実施例の安全保護シートの真偽判別装置は、図９に示すように、安全保護シート（１０）のいずれか一方の面側の特定光源（１１ａ）からの反射光での蛍光発光を、必要に応じてフィルタ（１２ａ）を介してセンサー（１３ａ）で検知し、同様に安全保護シート（１０）の他方の面側の特定光源（１１ｂ）からの反射光での蛍光発光を、必要に応じてフィルタ（１２ｂ）を介してセンサー（１３ｂ）で検知する。センサー（１３ａ）及び（１３ｂ）は感知した光量を電気信号である読み取り信号（Ｓ１３ａ）及び（Ｓ１３ｂ）に変換する。信号処理部（１４）はセンサー（１３ａ）及び（１３ｂ）で読み取った読み取り信号（Ｓ１３ａ）及び（Ｓ１３ｂ）の解析、情報化などの演算処理を行い、読み取り情報（Ｓ１４）に変換し、出力部（１４ａ）より出力する。情報比較部（１５）は、受け取った読み取り情報（Ｓ１４）を予め格納されている真正物である安全保護シートによって得られる読み取りデータと比較し、その結果に応じた真偽判別結果等の所定の情報を出力部（１５ａ）から出力する。信号処理部（１４）及び情報比較部（１５）は複数のコンピュータで処理する構造としても、一つのコンピュータ内で処理する構造としてもどちらでもよい。また、出力部（１５ａ）からは、ＣＲＴ、プリンタ等の出力機器、あるいはコンピュータ等の上位機器に接続することができる。
【００５４】
本真偽判別装置では、安全保護シートの特定光源下でのいずれか一方の面側及び他方の面側の反射光による蛍光発光を読み取り、前記安全保護シートの所定の位置において、それぞれの面側で得られた個々の信号、及び、それぞれの面側で得られた個々の信号を組み合わせた信号の解析、演算、真偽判定を行うことを特徴としているため、片面の蛍光発光データを単独で用いて真偽判別を行う場合よりも、判別要素が倍以上となり、精度よく真偽を判別することが可能である。
【００５５】
なお、本発明は上記実施例に限定されるものではなく、次のようにしても同様に実施できるものである。
（ａ）本発明において、蛍光物質を付与する方法としては、オフセット印刷、グラビア印刷、スクリーン印刷等の所定の印刷法、ロールコート、ブレードコート等の所定の塗布法、スプレーによる噴霧法を適用することが可能である。
（ｂ）本発明において、不透明物質を付与する方法としては、オフセット印刷、グラビア印刷、スクリーン印刷等の所定の印刷法を適用することが可能である。
（ｃ）本発明における真偽判別方法として、図示はしないが、実施例７と実施例８を組み合わせて、いずれか一方の面側の特定光源下での蛍光発光を反射光及び透過光で読み取り、且つ、他方の面側の蛍光発光を反射光で読み取り、予め記録されている蛍光発光のデータと比較して真偽の判別を行っても何ら支障はない。
（ｄ）本発明における真偽判別装置として、図示はしないが、実施例９の他にも、安全保護シートのいずれか一方のシート状基材側の特定光源下での蛍光発光を透過光で読み取り、且つ、他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取る装置、或いは、安全保護シートのいずれか一方のシート状基材側の特定光源下での蛍光発光を反射光及び透過光で読み取り、且つ、他方のシート状基材側の特定光源下での蛍光発光を反射光で読み取る装置から出力された読み取り情報を予め格納された真正物である安全保護シートによって得られる読み取りデータと比較し、比較した結果に応じた真偽判別結果等の所定の情報を出力する真偽判別装置を提供することも可能である。
【００５６】
【発明の効果】
以上説明したように本発明によれば、蛍光物質を層間に付与してシート状基材を積層する場合に、少なくとも一方の基材を透かし入りのものにするか、基材の表層の一部を除去するか、異なる発光色を有する蛍光物質を付与した基材同士を積層するか、積層する層間の一部に不透明物質を配置した構成とするようにしたので、特定光源下でのいずれか一方の面側の反射光と透過光、他方の面側の反射光で観察した時、少なくともいずれかの一つに異なる光学的効果が発現する偽造防止効果の高い、機械による読み取り、判別も可能な、耐久性に優れた安全保護シート及びその真偽判別方法並びにその真偽判別装置を提供することができる。
【図面の簡単な説明】
【図１】本発明による実施例１の安全保護シートの断面を示す図。
【図２】本発明による実施例２の安全保護シートの断面を示す図。
【図３】本発明による実施例３の安全保護シートの断面を示す図。
【図４】本発明による実施例４の安全保護シートの断面を示す図。
【図５】本発明による実施例５の安全保護シートの断面を示す図。
【図６】本発明による実施例６の安全保護シートの断面を示す図。
【図７】本発明による安全保護シートの特定光源下でのいずれか一方の面側及び他方の面側の反射光による蛍光発光を利用した実施例７の真偽判別方法の概要を示す図。
【図８】本発明による安全保護シートの特定光源下でのいずれか一方の面側の透過光による蛍光発光、及び、他方の面側の反射光による蛍光発光を利用した実施例８の真偽判別方法の概要を示す図。
【図９】本発明による安全保護シートの特定光源下でのいずれか一方の面側及び他方の面側の反射光による蛍光発光を利用した実施例９の真偽判別装置の構成を示す図。
【符号の説明】
１透かしを有する紙又は合成紙からなる基材
２透き入れ画像
３蛍光物質層
４紙又は合成紙からなる基材
５紙又は合成紙からなる基材
６基材除去部
７紙又は合成紙からなる基材
８蛍光物質層
９、９ａ、９ｂ不透明物質層
10 安全保護シート
11、11ａ、11ｂ特定光源
12ａ、12ｂフィルタ
13ａ、13ｂ受光センサー
Ｓ13ａ、Ｓ13ｂ読み取り信号（電気信号）
14 信号処理部
14ａ出力部
Ｓ14 読み取り情報
15 情報比較部
15ａ出力部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a security sheet used for securities such as stock certificates, certificates, gift certificates, admission tickets, passbooks, passports, identification cards, or other documents that may be counterfeited, a method for determining the authenticity thereof, and The present invention relates to the authenticity discrimination device.
[0002]
[Prior art]
Various methods have been devised in the past as methods for imparting a forgery prevention function to paper used for securities. Among them, a method using a fluorescent substance showing fluorescence or afterglow is widely used, and an image applied to a paper surface by a halftone plate and printing method using a printing ink containing the substance or a coating method using a paint. The method of visually recognizing under a specific light source is representative.
[0003]
Japanese Patent Laid-Open No. 3-166276 discloses an ink in which both a watermark pattern and a light-emitting pattern can be obtained by applying a colorless or light-colored fluorescent substance to non-drying oil or the like. By using such transparent or light-colored fluorescent ink, it is possible to provide a hidden design that is difficult to recognize under visible light reflection illumination and that can be recognized only under a specific light source.
[0004]
[Problems to be solved by the invention]
However, a method using a fluorescent material that exhibits fluorescence or afterglow is a relatively general method, and in a situation where fluorescent materials and fluorescent ink are available as commercial products in recent years, it was simply applied to the substrate surface layer. It has become difficult to maintain superiority as a forgery prevention method only by using light emission of a fluorescent substance. Also, with the method of applying a hidden pattern with transparent or light fluorescent ink, it is difficult to make a complete hidden pattern due to the difference in gloss due to the resin component of the ink, and the printed part is exposed to light etc. during distribution Has turned yellow, and the effect of the hidden pattern has been reduced.
[0005]
Therefore, the present invention has been made to solve the above-described problems, and was observed with reflected light and transmitted light on one surface side under a specific light source, and reflected light on the other surface side. At the same time, by providing a different optical effect to at least one of them, the anti-counterfeiting effect is enhanced, the machine can read and discriminate, and the safety protection sheet excellent in durability and its authenticity discrimination method and An object of the present invention is to provide a true / false discrimination device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, first, in the safety protection sheet of the invention according to claim 1, a fluorescent substance is arranged between layers in which sheet-like substrates are laminated, and a watermark is provided on at least one sheet-like substrate. It is a safety protection sheet.
[0007]
The safety protection sheet of the invention according to claim 2 is a safety protection sheet in which a fluorescent material is disposed between layers in which sheet-like substrates are laminated, and a part of the surface layer of at least one sheet-like substrate is removed.
[0008]
Also, Book The safety protective sheet of the invention is a safety protective sheet obtained by laminating sheet-like base materials provided with fluorescent materials having different emission colors on one side, with the fluorescent material application surface inside.
[0009]
Further, the safety protection sheet of the invention according to claim 3 conceals sheet-like substrates provided with fluorescent materials having different emission colors on one side, and at least part of one fluorescent material application surface is covered with an opaque material layer. And a safety protection sheet laminated with the fluorescent material application surface on the inside.
[0010]
Further, in the safety protection sheet of the invention according to claim 4, one of the fluorescent materials having different emission colors is on the entire surface of one side of the sheet-like base material, and the other is a part of the one side of the sheet-like base material (a desired pattern is provided). It is a safety protection sheet that is arranged).
[0011]
In the safety protection sheet of the invention according to claim 5, the fluorescent material is disposed between the layers in which the sheet-like base material is laminated, and the opaque material layer is provided at least in part between the layers of the one sheet-like base material and the fluorescent material layer. Is a safety protection sheet.
[0012]
According to a sixth aspect of the present invention, there is provided a safety protection sheet comprising: a fluorescent material disposed between layers in which a sheet-like base material is laminated; and an opaque material layer having a different pattern between each of the sheet-like base material and the fluorescent material layer. Is a safety protection sheet.
[0013]
Also, Claim 7 or The safety protection sheet of the invention according to claim 8 is at least one when observed with reflected light and transmitted light on one sheet-like base material side, reflected light on the other sheet-like base material side under a specific light source. It is a safety protection sheet in which one observation image has different optical effects.
[0014]
According to a ninth aspect of the present invention, there is provided a method for determining the authenticity of a safety protection sheet, which reflects fluorescence emission under a specific light source on one sheet-like substrate side and the other sheet-like substrate side of the safety protection sheet. This is a method for determining the authenticity of a safety protection sheet, wherein the authenticity is determined by comparing with fluorescence emission data recorded in advance by reading with light.
[0015]
Moreover, the authenticity determination method of the safety protection sheet of the invention according to claim 10 reads the fluorescence emission under a specific light source on the sheet-like substrate side of any one of the safety protection sheets with transmitted light, and the other A method for determining the authenticity of a safety protection sheet, comprising: reading fluorescence emission under a specific light source on a sheet-like substrate side with reflected light and comparing the fluorescence emission data recorded in advance with authenticity determination .
[0016]
The authenticity determination method of the safety protection sheet of the invention according to claim 11 reads the fluorescence emission under a specific light source on the sheet-like substrate side of any one of the safety protection sheets with reflected light and transmitted light, and Authenticity discrimination of the safety protection sheet characterized by reading the fluorescence emission under a specific light source on the other sheet-like substrate side with reflected light and comparing it with pre-recorded fluorescence emission data Is the method.
[0017]
The authenticity determination device for a safety protection sheet of the invention according to claim 12 reflects fluorescence emission under a specific light source on either the sheet-like substrate side and the other sheet-like substrate side of the safety protection sheet. An apparatus for authenticating the safety protection sheet by reading with light, a first specific light irradiation means for irradiating light of a specific wavelength provided on one sheet-like substrate side of the safety protection sheet; The second specific light irradiating means for irradiating light of a specific wavelength provided on the other sheet-like substrate side, and the safety protection when irradiating light of a specific wavelength by the first and second specific light irradiating means First and second fluorescence sensing means for sensing and converting the fluorescence emitted from the sheet into read signals, respectively, and processing the respective read signals from the first and second fluorescence sensing means, Fluorescence tone and pattern A reading device comprising signal processing means for reading information relating to the information, and a color and pattern of fluorescent light emission obtained by a safety protection sheet which is a genuine article in which each of the reading information received from the reading device is stored in advance It is a safety protection sheet authenticity determination device having information comparison means for outputting a result of the security protection sheet authenticity determination in comparison with read information.
[0018]
The authenticity determination device for a safety protection sheet of the invention according to claim 13 reads the fluorescence emission under a specific light source on one sheet-like substrate side of the safety protection sheet with transmitted light, and the other An apparatus for authenticating the safety protection sheet by reading fluorescence emission under a specific light source on the sheet-like base material side with reflected light, the identification provided on one sheet-like base material side of the safety protection sheet A specific light irradiating means for irradiating light of a wavelength; and a first light that senses and converts fluorescence emitted from and reflected from the safety protective sheet when irradiated with light of a specific wavelength by the specific light irradiating means. And a second fluorescence sensing means, and a signal processing means for processing the read signals from the first and second fluorescence sensing means to obtain read information relating to the color tone and pattern of the fluorescence emission. Comparing the reading information relating to the color tone and pattern of the fluorescence emission obtained by the reading device configured and the reading information received from the reading device with the safety protection sheet which is a genuine article stored in advance, the safety protection sheet This is a safety protection sheet authenticity determination device having information comparison means for outputting the result of authenticity determination.
[0019]
The authenticity determination device for the safety protection sheet of the invention according to claim 14 reads the fluorescence emission under a specific light source on the sheet-like substrate side of any one of the safety protection sheets with reflected light and transmitted light, and A device for reading the fluorescence emission under a specific light source on the other sheet-like base material side with reflected light to determine the authenticity of the safety protection sheet, provided on one sheet-like base material side of the safety protection sheet A first specific light irradiating means for irradiating light of a specified wavelength, a second specific light irradiating means for irradiating light of a specific wavelength provided on the other sheet-like substrate side, and the first specific First fluorescence sensing means that senses fluorescence emitted from the safety protection sheet and converts it into a read signal when irradiated with light of a specific wavelength by the light irradiation means, and a specific wavelength by the second specific light irradiation means The above safety A second fluorescence sensing means for sensing fluorescence emitted from the sheet and converting it into a read signal; and fluorescence reflected from the safety protection sheet when irradiated with light of a specific wavelength by the second specific light irradiation means. A third fluorescence sensing means for sensing light emission and converting it into a reading signal; and processing the respective reading signals from the first, second and third fluorescence sensing means to relate to the color tone and pattern of the fluorescence emission Reading about a color tone and a pattern of fluorescent light emission obtained by a reading device composed of a signal processing means to be read information, and each of the reading information received from the reading device is a genuine safety protection sheet stored in advance. An information comparing means for outputting a result of authenticity determination of the safety protection sheet in comparison with information; A discriminating device.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The safety protective sheet of the present invention is a transparent or light colored fluorescent ink that is simply applied to the surface layer by applying a fluorescent material that emits fluorescence under excitation light of a specific light source, for example, ultraviolet rays or infrared rays, between the layers of the sheet-like substrate. The structure can be easily concealed as a concealed pattern rather than imparting a pattern, and the structure has excellent durability with little yellowing of the pattern portion even when exposed to light or the like during distribution.
[0021]
Further, in the safety protection sheet of the present invention, paper, synthetic paper, plastic sheet, etc. can be appropriately selected and used as the sheet-like substrate, but transparent paper is used, part of the surface layer is removed, opaque substance By using a method such as the provision of a concealing layer, an optical effect that cannot be obtained by simply applying a pattern to the surface layer with a transparent or light-colored fluorescent ink, that is, either a safety protection sheet under a specific light source. Resistance to counterfeiting by configuring the safety protection sheet so that at least one of them has a different optical effect when observed with reflected light and transmitted light on one side, and reflected light on the other side Is increasing.
[0022]
Further, in this way, when the safety protection sheet is observed with reflected light and transmitted light on one surface side and reflected light on the other surface side under a specific light source, at least one of them has different optical effects. The action and effect of playing can be applied not only to visual true / false judgments but also to machine true / false judgments,
(A) Fluorescence emission on either side of the safety protective sheet and the other side is reflected light,
(B) Fluorescence emission on one surface side of the safety protection sheet is transmitted light, and fluorescence emission on the other surface side is reflected light,
(C) Fluorescence emission on one surface side of the safety protection sheet is reflected light and transmitted light, and fluorescence emission on the other surface side is reflected light,
If necessary, the authenticity can be determined by reading with a sensor through a filter and comparing and collating it with the fluorescence emission data obtained by a genuine safety protection sheet recorded in advance.
[0023]
In addition, as a transmitted light image to be referred to when authenticating the safety protection sheet of the present invention, it is sufficient to use a transmitted light image on one of the surfaces.
[0024]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the examples shown below, an example in which paper or synthetic paper is used as the sheet-like base material is shown. However, in this case, the base material made of paper or synthetic paper has an opacity with which fluorescence emission can be confirmed through the base material layer. Although it is desirable that the substrate itself does not emit fluorescence, there are no other restrictions due to the type of fiber, the blending of the paper stock, the type and amount of the internal additive, and the like. Moreover, a synthetic resin sheet such as a plastic sheet can be used as a sheet-like base material as necessary.
[0025]
(Example 1)
FIG. 1 is a cross-sectional view showing a configuration example of a safety protection sheet according to the first embodiment of the present invention. As shown in FIG. 1, the safety protective sheet of this example is a fluorescent ink (for example, on one side of a base material (1) made of paper or synthetic paper having a transparent image (2) by papermaking by a netting method or the like. An ultraviolet-excited green No. 3 manufactured by Dainippon Ink and Chemicals, Inc.) is used to perform solid printing with an ink film thickness of about 1 to 3 μm to form a fluorescent material layer (3). The base material (1) and the base material (4) made of different paper or synthetic paper are laminated and bonded using an adhesive or the like so that the fluorescent material layer (3) is inside.
[0026]
When the safety protection sheet thus configured is observed using ultraviolet light of 365 nm as a light source, in the observation with reflected light or transmitted light on the surface side of the base material (1) having a clearness, the transmitted light amount is reduced at the clearing portion. Because the difference occurs, the intensity of green fluorescence is low because the amount of transmitted light is small in the portion where the fiber density is high, and conversely, the intensity of green fluorescence is increased because the amount of transmitted light is large in the portion where the fiber density is low. (2) can be recognized as an image by fluorescence emission.
[0027]
On the other hand, in the observation with the reflected light on the base material (4) surface side that does not have clearness, since the amount of light transmitted through the base material (4) is almost equal, the intensity of green fluorescence is recognized almost equally, or Due to the effect of the amount of light reflected from the substrate (1), the portion of the substrate (1) where the fiber density is high has a large amount of reflected light, so the intensity of green fluorescence is strong, and the portion where the fiber density is low has a small amount of reflected light. The intensity of the fluorescence becomes weak, and it is recognized as an image obtained by inverting the negative or positive of the reflected light or transmitted light image on the substrate (1) surface side.
[0028]
That is, a safety protective sheet having optical effects different from each other when at least one of the reflected light and transmitted light on one surface side and the reflected light on the other surface side is observed with respect to ultraviolet light is obtained. It is done.
[0029]
(Example 2)
FIG. 2 is a cross-sectional view showing a configuration example of the safety protection sheet according to the second embodiment of the present invention. As shown in FIG. 2, the safety protective sheet of this example is a fluorescent ink (for example, UV-excited green No. 3) on one side of either a base material (4) or (5) made of paper or synthetic paper. , Manufactured by Dainippon Ink & Chemicals, Inc.), the ink film thickness is about 1 to 3 μm, and the phosphor layer (3) is formed. The phosphor layer (3) is formed using an adhesive or the like. A base material (4) and a base material (5) are laminated | stacked and couple | bonded so that it may become an inner side. A part of the laminated base material is formed as a base material removing portion (6) to be a pattern by using a method such as laser processing.
[0030]
When the safety protection sheet thus configured is observed using 365 nm ultraviolet light as a light source, the base material (5) having the base material removal portion (6) is observed with reflected or transmitted light on the surface side. Since the intensity of the green fluorescence of the removal unit (6) is increased, the pattern applied by the base material removal unit (6) can be recognized as an image by fluorescence emission.
[0031]
On the other hand, in the observation with the reflected light on the substrate (4) surface side, since the amount of light transmitted through the substrate (4) is almost equal, the intensity of the green fluorescence is recognized almost equally or the substrate removing portion ( Due to the decrease in the amount of light reflected from 6), the intensity of green fluorescence becomes weak, and it is recognized as an image obtained by inverting the negative or positive of the reflected light or transmitted light image on the substrate (5) surface side.
[0032]
That is, a safety protective sheet having optical effects different from each other when at least one of the reflected light and transmitted light on one surface side and the reflected light on the other surface side is observed with respect to ultraviolet light is obtained. It is done.
[0033]
(Example 3)
FIG. 3 is a cross-sectional view showing a configuration example of a safety protection sheet according to the third embodiment of the present invention. As shown in FIG. 3, the safety protective sheet of this example is a fluorescent ink (for example, UV-excited green No. 3, Dainippon Ink & Chemicals, Inc.) on one side of a base material (4) made of paper or synthetic paper. ), Etc.), a solid printing with an ink film thickness of about 1 to 3 μm is performed to form the fluorescent material layer (3). In addition, an ink film thickness of 1 to 3 μm with fluorescent ink (for example, UV-excited blue No. 1, manufactured by Dainippon Ink & Chemicals, Inc.) on one side of a base material (7) made of another paper or synthetic paper. A pattern of the fluorescent material layer (8) is formed by printing to the extent. The substrates (4) and (7) are laminated and bonded using an adhesive or the like so that the fluorescent material layers (3) and (8) are inside.
[0034]
When the safety protection sheet thus configured is observed using 365 nm ultraviolet light as a light source, the fluorescent light emission of the fluorescent material layer (3) appears strongly in the observation with the reflected light on the substrate (4) surface side, and the green color is green. Light emission can be recognized.
[0035]
On the other hand, in the observation with the reflected light on the substrate (7) surface side, the blue light emission of the fluorescent material layer (8) as a pattern can be recognized during the green light emission of the fluorescent material layer (3) as the ground color. Further, in the observation with the transmitted light on the surface side of the base material (4), during the green light emission of the fluorescent material layer (3) as the ground color, the blue color of the fluorescent material layer (8) and the fluorescent material layer (3) Light emission mixed with green can be recognized.
[0036]
That is, when the ultraviolet light is observed with the reflected light and transmitted light on one of the surfaces, and the reflected light on the other surface, a safety protective sheet having optical effects different from each other can be obtained.
[0037]
(Example 4)
FIG. 4 is a cross-sectional view showing a configuration example of a safety protection sheet according to the fourth embodiment of the present invention. As shown in FIG. 4, the safety protective sheet of this example is a fluorescent ink (for example, UV-excited green No. 3, Dainippon Ink & Chemicals, Inc.) on one side of a base material (4) made of paper or synthetic paper. ), Etc.), a solid printing with an ink film thickness of about 1 to 3 μm is performed to form the fluorescent material layer (3). Further, an opaque material layer is printed on the fluorescent material layer with an ink having a high hiding power (for example, an ink having a color equivalent to that of a base material mainly composed of titanium dioxide) with an ink film thickness of about 1 to 3 μm. The symbol (9) is formed. In addition, an ink film thickness of 1 to 3 μm with fluorescent ink (for example, UV-excited blue No. 1, manufactured by Dainippon Ink & Chemicals, Inc.) on one side of a base material (7) made of another paper or synthetic paper. A pattern of the fluorescent material layer (8) is formed by printing to the extent. The substrates (4) and (7) are laminated and bonded using an adhesive or the like so that the fluorescent material layers (3) and (8) are inside.
[0038]
When the safety protection sheet thus configured is observed using 365 nm ultraviolet light as a light source, the fluorescent light emission of the fluorescent material layer (3) appears strongly in the observation with the reflected light on the substrate (4) surface side, and the green color is green. Light emission can be recognized.
[0039]
On the other hand, in the observation with the reflected light on the substrate (7) surface side, depending on the design, during the green light emission of the fluorescent material layer (3) as the ground color partially concealed by the opaque material layer (9), The blue light emission of the fluorescent material layer (8) can be recognized. Moreover, in the observation by the transmitted light on the base material (7) surface side or the base material (4) surface side, the blue color of the fluorescent material layer (8) as a pattern during the green light emission of the fluorescent material layer (3) as the ground color. And the green light of the fluorescent material layer (3) can be recognized by being partially hidden by the opaque material layer (9).
[0040]
That is, when the ultraviolet light is observed with the reflected light and transmitted light on one of the surfaces, and the reflected light on the other surface, a safety protective sheet having optical effects different from each other can be obtained.
[0041]
(Example 5)
FIG. 5 is a cross-sectional view showing a configuration example of a safety protection sheet according to the fifth embodiment of the present invention. As shown in FIG. 5, the safety protective sheet of this example has a fluorescent ink (for example, UV-excited green No. 3, Dainippon Ink & Chemicals, Inc.) on one side of a base material (4) made of paper or synthetic paper. ), Etc.), a solid printing with an ink film thickness of about 1 to 3 μm is performed to form the fluorescent material layer (3). Also, it is equivalent to a base material (7) made of another paper or synthetic paper or on the fluorescent material layer of the base material (4) with a high hiding power (for example, a base material containing titanium dioxide as a main pigment) Color ink) is printed with an ink film thickness of about 1 to 3 μm to form an opaque material layer (9), and the base materials (4) and (7) are made of a fluorescent material layer using an adhesive or the like. Laminate and bond so that (3) and opaque substance layer (9) are inside.
[0042]
When the safety protection sheet thus configured is observed using ultraviolet light of 365 nm as a light source, green light emission is recognized by the fluorescent light emission of the fluorescent material layer (3) in the observation by the reflected light on the substrate (4) surface side. it can.
[0043]
On the other hand, green light emission of the fluorescent material layer (3) partially concealed by the opaque material layer (9) can be recognized by observation with reflected light and transmitted light on the base material (7) surface side.
[0044]
That is, a safety protective sheet having optical effects different from each other when at least one of the reflected light and transmitted light on one surface side and the reflected light on the other surface side is observed with respect to ultraviolet light is obtained. It is done.
[0045]
(Example 6)
FIG. 6 is a cross-sectional view showing a configuration example of a safety protection sheet according to the sixth embodiment of the present invention. As shown in FIG. 6, the safety protection sheet of this example has a high concealing ink on one side of a base material (4) made of paper or synthetic paper (for example, a color equivalent to a base material containing titanium dioxide as a main pigment). The ink film thickness is printed with an ink film thickness of about 1 to 3 μm, and an opaque material layer (9b) pattern is formed. Then, fluorescent ink (for example, UV-excited green No. 3, Dainippon Ink and Chemicals, Inc.) Etc.), and the ink film thickness is about 1 to 3 μm, and the phosphor layer (3) is formed. Furthermore, from one side of the base material (7) made of another paper or synthetic paper or from the fluorescent material layer of the base material (4), it is equivalent to a base material having a high hiding power (for example, a base material containing titanium dioxide as a main pigment) Color ink) is printed with an ink film thickness of about 1 to 3 μm to form an opaque material layer (9a), and then the substrates (4) and (7) are made of an opaque material using an adhesive or the like. The layers (9a) and (9b) and the fluorescent material layer (3) are laminated and bonded so as to be inside.
[0046]
When the safety protection sheet thus configured is observed using ultraviolet light of 365 nm as a light source, the fluorescent material partially concealed by the opaque material layer (9b) is observed by the reflected light on the substrate (4) surface side. The green light emission of the layer (3) can be recognized.
[0047]
On the other hand, in the observation with the reflected light on the substrate (7) surface side, the green emission of the fluorescent material layer (3) partially hidden by the opaque material layer (9a) can be recognized. Further, in the observation with the transmitted light on the substrate (7) surface side or the substrate (4) surface side, the fluorescent material layer (3) partially hidden by the synthetic pattern of the opaque material layers (9a) and (9b) Green light emission can be recognized.
[0048]
That is, when the ultraviolet light is observed with the reflected light and transmitted light on one of the surfaces, and the reflected light on the other surface, a safety protective sheet having optical effects different from each other can be obtained.
[0049]
(Example 7)
FIG. 7 is a schematic diagram showing an example of a security sheet authenticity determination method according to the seventh embodiment of the present invention. The authenticity determination method of the safety protection sheet of the present embodiment, as shown in FIG. 7, the fluorescence emission by the reflected light from the specific light source (11a) on either side of the safety protection sheet (10), If necessary, it is read by the sensor (13a) through the filter (12a), and similarly, the fluorescence emission from the reflected light from the specific light source (11b) on the other surface side of the safety protection sheet (10) The sensor (13b) reads through the filter (12b). The two fluorescence emission data are compared with the fluorescence emission data recorded in advance to determine whether it is true or false.
[0050]
Since this true / false discrimination method is characterized in that the difference in fluorescence emission between the reflected light on one surface side and the other surface side of the safety protection sheet is read, the fluorescent material is simply applied to the surface layer of the sheet-like substrate. Forgery by simply assigning, it is easily overlooked as a fake, and it is possible to determine authenticity more accurately than authenticity determination based on single-sided fluorescence emission data.
[0051]
(Example 8)
FIG. 8 is a schematic diagram showing an example of a security sheet authenticity determination method according to the eighth embodiment of the present invention. The authenticity determination method of the safety protection sheet of the present embodiment, as shown in FIG. 8, the fluorescence emission with the transmitted light from the specific light source (11) on either side of the safety protection sheet (10), The sensor (13a) is read through the filter (12a) as necessary, and the fluorescence emitted from the reflected light from the specific light source (11) is similarly measured through the filter (12b) as necessary. Read with. The two fluorescence emission data are compared with the fluorescence emission data recorded in advance to determine whether it is true or false.
[0052]
Since this true / false discrimination method is characterized by reading the difference in fluorescence emission between the transmitted light on one side of the safety protection sheet and the reflected light on the other side, it is simply the surface layer of the sheet-like substrate. Forgery by simply adding a fluorescent material to the material is easily identified as a fake, and it is possible to determine authenticity more accurately than authenticity determination based on single-sided fluorescence emission data.
[0053]
Example 9
FIG. 9 is a configuration diagram showing an example of a security sheet authenticity determination device according to a ninth embodiment of the present invention. As shown in FIG. 9, the authenticity determination device for the safety protection sheet of the present embodiment performs fluorescence emission with reflected light from the specific light source (11a) on either side of the safety protection sheet (10). If necessary, it is detected by the sensor (13a) through the filter (12a), and similarly, the fluorescent light emission by the reflected light from the specific light source (11b) on the other surface side of the safety protection sheet (10) is necessary. In response, the sensor (13b) detects through the filter (12b). The sensors (13a) and (13b) convert the detected light amount into read signals (S13a) and (S13b) which are electrical signals. The signal processing unit (14) performs arithmetic processing such as analysis and computerization of the read signals (S13a) and (S13b) read by the sensors (13a) and (13b), converts them into read information (S14), and outputs an output unit Output from (14a). The information comparison unit (15) compares the received read information (S14) with the read data obtained by the pre-stored authentic safety protection sheet, and determines a predetermined result such as the authenticity determination result according to the result. Information is output from the output unit (15a). The signal processing unit (14) and the information comparison unit (15) may have either a structure for processing by a plurality of computers or a structure for processing by one computer. The output unit (15a) can be connected to an output device such as a CRT or a printer, or a host device such as a computer.
[0054]
In this authenticity determination device, the fluorescence emission by the reflected light on one surface side and the other surface side under a specific light source of the safety protection sheet is read, and each surface side at a predetermined position of the safety protection sheet It is characterized by performing analysis, calculation, and authenticity determination of individual signals obtained in, and individual signals obtained on each side, so that fluorescence emission data on one side can be obtained independently. Compared to the case of using true / false discrimination, the discrimination factor is twice or more, and it is possible to discriminate true / false with high accuracy.
[0055]
In addition, this invention is not limited to the said Example, Even if it carries out as follows, it can implement similarly.
(A) In the present invention, as a method for applying a fluorescent substance, a predetermined printing method such as offset printing, gravure printing, screen printing, a predetermined coating method such as roll coating or blade coating, or a spraying method by spraying is applied. It is possible.
(B) In the present invention, as a method for applying an opaque substance, a predetermined printing method such as offset printing, gravure printing, or screen printing can be applied.
(C) Although not shown in the drawings as a true / false determination method in the present invention, the fluorescence emission under a specific light source on either one of the surfaces is read with reflected light and transmitted light, by combining Example 7 and Example 8. In addition, there is no problem even if the fluorescence emission on the other surface side is read with the reflected light and the authenticity is determined by comparing with the fluorescence emission data recorded in advance.
(D) Although not shown in the drawings as a true / false discrimination device in the present invention, in addition to Example 9, the fluorescence emission under a specific light source on the sheet-like substrate side of any one of the safety protection sheets is transmitted light. Reading and reading the fluorescence emission under the specific light source on the other sheet-like base material side with reflected light, or the fluorescence emission under the specific light source on either the sheet-like base material side of the safety protection sheet By the safety protection sheet which is a genuine article stored in advance, the reading information output from the apparatus that reads the reflected light and the transmitted light and outputs the fluorescence emission under the specific light source on the other sheet-like base material side with the reflected light It is also possible to provide a true / false discriminating apparatus that compares the obtained read data and outputs predetermined information such as a true / false discrimination result according to the comparison result.
[0056]
【The invention's effect】
As described above, according to the present invention, when laminating a sheet-like base material by applying a fluorescent substance between the layers, at least one base material is watermarked or a part of the surface layer of the base material. Or by stacking base materials to which fluorescent materials having different emission colors are laminated, or by placing an opaque material in a part of the layers to be laminated, either under a specific light source When observed with reflected light and transmitted light on one side, and reflected light on the other side, at least one of them has a different optical effect and has a high anti-counterfeiting effect. In addition, it is possible to provide a safety protection sheet excellent in durability, its authenticity determination method and its authenticity determination device.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a safety protection sheet of Example 1 according to the present invention.
FIG. 2 is a cross-sectional view of a safety protection sheet of Example 2 according to the present invention.
FIG. 3 is a view showing a cross section of the safety protection sheet of Example 3 according to the present invention.
FIG. 4 is a cross-sectional view of a safety protection sheet of Example 4 according to the present invention.
FIG. 5 is a view showing a cross section of the safety protection sheet of Example 5 according to the present invention.
FIG. 6 is a view showing a cross section of a safety protective sheet of Example 6 according to the present invention.
FIG. 7 is a diagram showing an outline of the authenticity determination method of Example 7 using fluorescence emission by reflected light on one surface side and the other surface side under a specific light source of the safety protection sheet according to the present invention.
FIG. 8 shows the authenticity of Example 8 using fluorescence emission by transmitted light on one surface side of a safety protection sheet according to the present invention and fluorescence emission by reflected light on the other surface side. The figure which shows the outline | summary of the determination method.
FIG. 9 is a diagram showing a configuration of a true / false determination apparatus according to a ninth embodiment that uses fluorescence emission by reflected light on one side and the other side of a safety protection sheet according to the present invention under a specific light source.
[Explanation of symbols]
1. Substrate made of watermarked paper or synthetic paper
2 Clear image
3 Fluorescent substance layer
4 Base material made of paper or synthetic paper
5 Base material made of paper or synthetic paper
6 Substrate removal part
7 Base material made of paper or synthetic paper
8 Fluorescent substance layer
9, 9a, 9b Opaque material layer
10 Safety protection sheet
11, 11a, 11b Specific light source
12a, 12b filter
13a, 13b Light receiving sensor
S13a, S13b Reading signal (electrical signal)
14 Signal processor
14a Output section
S14 Reading information
15 Information comparison section
15a Output section

Claims

A safety protective sheet in which a fluorescent material is arranged between layers on which sheet-like substrates are laminated, and a watermark is provided on at least one sheet-like substrate.

A safety protective sheet in which a fluorescent material is disposed between layers on which sheet-like substrates are laminated, and a part of the surface layer of at least one sheet-like substrate is removed.

Safety by laminating sheet-like substrates with fluorescent materials with different emission colors on one side, concealing at least part of one fluorescent material application surface with an opaque material layer, with the fluorescent material application surface inside Protective sheet.

The safety protection sheet according to claim 3, wherein one of the fluorescent materials is arranged so as to form a desired pattern on one side of the sheet-like base material and on the other side of the sheet-like base material.

A safety protective sheet in which a fluorescent material is disposed between layers on which sheet-like substrates are laminated, and an opaque material layer is disposed at least in part between the layers of one sheet-like substrate and the fluorescent material layer.

A safety protective sheet in which a fluorescent material is arranged between layers in which sheet-like substrates are laminated, and an opaque material layer having a different pattern is arranged between each of the sheet-like substrate and the fluorescent material layer.

A watermark or a part of the surface layer applied to the sheet-like base material when observed with reflected light and transmitted light on the side of one sheet-like base material and reflected light on the other sheet-like base material side under a specific light source 3. The safety protection according to claim 1 , wherein at least one observation image has a different optical effect due to a difference in the amount of transmitted light and / or the amount of reflected light depending on the region from which light is removed. Sheet.

When observed with reflected light and transmitted light on one sheet-like substrate side under a specific light source, and reflected light on the other sheet-like substrate side, the sheet-like substrate is a part of the fluorescent material-applied surface wherein by non-transparent material layer is disposed, said by concealing a part of the color from the fluorescent substance, to claim 3 characterized in that it has an optical effect which at least one of the observation images are different in The safety protective sheet according to any one of 6 .

Fluorescence emission under a specific light source on one of the sheet-like base material side and the other sheet-like base material side of any one of the safety protection sheets according to claim 1 is read with reflected light and recorded in advance. A method for determining the authenticity of a safety protection sheet, wherein the authenticity is determined by comparing with fluorescence emission data.

The fluorescent light emission under a specific light source on one sheet-like base material side of any one of the safety protection sheets according to claim 1 is read with transmitted light, and under the specific light source on the other sheet-like base material side The authenticity determination method for the safety protection sheet, wherein the fluorescence emission at the reading is read with reflected light and is compared with the fluorescence emission data recorded in advance.

The fluorescent light emission under a specific light source on one sheet-like substrate side of any one of the safety protection sheets according to claim 1 is read with reflected light and transmitted light, and on the other sheet-like substrate side. A method for determining the authenticity of a safety protection sheet, comprising: reading fluorescence emission under a specific light source with reflected light and comparing the fluorescence emission data recorded in advance with authenticity.

The fluorescent sheet under a specific light source on one of the sheet-like substrate side and the other sheet-like substrate side of any one of the safety protection sheets according to claim 1 is read with reflected light, and the safety protection sheet is used. An apparatus for determining authenticity, the first specific light irradiating means for irradiating light of a specific wavelength provided on one sheet-like substrate side of the safety protection sheet, and provided on the other sheet-like substrate side A second specific light irradiating means for irradiating light of a specified wavelength and a fluorescence emission reflected from the safety protection sheet when irradiated with light of a specific wavelength by the first and second specific light irradiating means, respectively. First and second fluorescence sensing means for sensing and converting to a read signal, and reading information on the color and pattern of the fluorescence emission by processing the respective read signals from the first and second fluorescence sensing means Signal Comparing the reading information received from the reading device with the reading information related to the color and pattern of the fluorescence emission obtained by the safety protection sheet which is a genuine article stored in advance. An apparatus for determining the authenticity of a safety protection sheet, comprising information comparison means for outputting a result of the authentication of the safety protection sheet.

The fluorescent light emission under a specific light source on one sheet-like base material side of any one of the safety protection sheets according to claim 1 is read with transmitted light, and under the specific light source on the other sheet-like base material side A device for reading the fluorescence emission at the reflected light to determine the authenticity of the safety protection sheet, and irradiating light of a specific wavelength provided on one sheet-like substrate side of the safety protection sheet And first and second fluorescence sensing means for sensing and converting the fluorescence emission transmitted and reflected from the safety protection sheet when irradiated with light of a specific wavelength by the specific light irradiation means, respectively, to read signals, A reader comprising signal processing means for processing the read signals from the first and second fluorescence sensing means to obtain read information relating to the color tone and pattern of the fluorescence emission; Each of the read information received from the reading device is compared with the read information regarding the color and pattern of fluorescent light emission obtained by the safety protection sheet which is a genuine article stored in advance, and the result of the authenticity determination of the safety protection sheet is output. A security protection sheet authenticity determination device having an information comparison means.

The fluorescent light emission under a specific light source on one sheet-like substrate side of any one of the safety protection sheets according to claim 1 is read with reflected light and transmitted light, and on the other sheet-like substrate side. An apparatus for authenticating the safety protection sheet by reading fluorescence emission under a specific light source with reflected light, and irradiating light of a specific wavelength provided on one sheet-like substrate side of the safety protection sheet First specific light irradiating means, second specific light irradiating means for irradiating light of a specific wavelength provided on the other sheet-like substrate side, and light having a specific wavelength by the first specific light irradiating means A first fluorescence sensing means for sensing fluorescent light reflected from the safety protection sheet when irradiated and converting it into a read signal; and the safety protection when irradiated with light of a specific wavelength by the second specific light irradiation means. Fluorescence emission transmitted from the sheet A second fluorescence sensing means that senses and converts it into a read signal; and a fluorescence signal reflected from the safety protection sheet when the second specific light irradiation means irradiates light of a specific wavelength, A third fluorescence sensing means for conversion; and a signal processing means for processing the read signals from the first, second and third fluorescence sensing means to obtain read information relating to the color tone and pattern of the fluorescence emission; The safety protection by comparing each of the reading information received from the reading device with the reading information relating to the color tone and pattern of the fluorescence emission obtained by the safety protection sheet which is a genuine article stored in advance. An apparatus for determining the authenticity of a safety protection sheet, comprising information comparing means for outputting a result of the authenticity determination of the sheet.