JP2004009694A - Prints involving concealed information and method of identifying concealed information - Google Patents

Prints involving concealed information and method of identifying concealed information Download PDF

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Publication number
JP2004009694A
JP2004009694A JP2002170104A JP2002170104A JP2004009694A JP 2004009694 A JP2004009694 A JP 2004009694A JP 2002170104 A JP2002170104 A JP 2002170104A JP 2002170104 A JP2002170104 A JP 2002170104A JP 2004009694 A JP2004009694 A JP 2004009694A
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Japan
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resins
printed matter
resin
printed
confidential information
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JP2002170104A
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Japanese (ja)
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Yasushi Ozaki
尾▲崎▼ 靖
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National Printing Bureau
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National Printing Bureau
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for effectively utilizing a concealed information in the form of wave frequencies at a peak level of an infrared absorption spectrum of a resin that constitutes a printing ink. <P>SOLUTION: The prints whose basic material (1) is printed with the words E (3) in an ink that contains an alkyd resin and the words X (4) in an ink that contains an acrylate resin, respectively, whereas the words in the above prints are expressed as an image after mapping measurement by microscopic direct reflection, one of the infrared analytic methods, on the respective specific absorption peaks of resin strengths in an infrared absorption spectrum of direct reflection on a section printed with the words E (3) and the words X (4). Since the images obtainable as above are specific and different, respectively, such characteristics are utilized as a means for avoiding forgery or concealment of an information. The forgery prevention can be more effective when not less than 2 resins with different peak levels and strengths are combined. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、樹脂が異なるインキを組み合わせて、目視では認識できない秘匿情報を付与して真偽判別を可能としている秘匿情報を付与した印刷物及び該秘匿情報の識別方法に関するものであり、特に銀行券、株券又は債権等の有価証券類、各種証明書類、パスポート又はカードに適した技術である。
【0002】
【従来の技術】
本発明者は、先に他の発明者と、蛍光材料等の特殊な材料を用いることなく、樹脂や顔料などの物質の定性的及び定量的な測定が可能な測定法として赤外分光法の一つである全反射法を用いて、インキを構成する樹脂成分の違いを識別することで、印刷物の真偽判別をする方法を見いだし、「秘匿情報を付与した印刷物及び該秘匿情報の識別方法」(特願2001−243235)として出願した。しかし、この全反射吸収法を用いた方法は、印刷物に接触した状態で測定しなければならないため、軟らかい印刷物の場合には表面がくぼむことがあり、貴重製品の真偽判別に適応できないこともあることが分かった。また、全反射吸収法により得られた情報は印刷物の一点における情報であり、得られた赤外スペクトルの違いのみの比較しかできないという制約もある。
【0003】
また、赤外スペクトルの特性吸収ピークにより連続情報つまり画像を得るために全反射吸収法を用いた顕微マッピング法も開発されているが、印刷物の場合、印刷による印刷物表面の凹凸の影響を大きく受けるため検出感度が悪いということと測定時間が数十時間以上かかるため実用的でない。
【0004】
【発明が解決しようとする課題】
そこで、本発明は従来技術における上記問題点を解決するためになされたもので、樹脂や顔料などの物質の構造情報の違いをスペクトルとして得ることができる赤外分光法の一つである顕微正反射法を用いて、インキを構成する樹脂成分の違いを識別することに利用したものである。この方法の利点は、全反射吸収法とは異なり、試料(例えば金属上の塗膜や紙の上に印刷された印刷物)に非接触での測定が可能であり、かつμmオーダーの微小領域の測定を試料上で走査するマッピング測定も短時間で可能である点である。そのため、異なる種類の樹脂であり、赤外吸収スペクトルの特性吸収ピーク波数で表されるスペクトルの位置も異なる樹脂を用いたインキで印刷した印刷物は、顕微正反射法を用いて測定することにより樹脂に帰属される特性吸収ピーク強度を画像として表示することが可能であり、この方法を用いれば樹脂の種類が異なるインキから成る印刷物を非破壊及び非接触で測定することにより、インキを構成する樹脂を画像として識別することができ、さらに、樹脂の違いは目視では判別できないため、樹脂の種類が異なり、樹脂の赤外吸収スペクトルの特性吸収ピーク位置も互いに異なるインキの組み合わせに秘匿情報を付与することも可能である。
【0005】
本発明においては、上記のようにインキを構成する樹脂成分に秘匿情報を付与することにより真偽判別するようにした、秘匿情報を付与した印刷物及び該秘匿情報の識別方法を提供する。
【0006】
【発明が解決しようとする手段】
本発明の秘匿情報を付与した印刷物は、基材上に、複数のインキに各々含有する樹脂の種類が異なり、前記樹脂の赤外吸収スペクトルの特性吸収ピーク波数も互いに異なる、前記複数のインキを組み合わせて印刷した印刷物であって、前記印刷物に、赤外分析法における非破壊及び非接触検査法である顕微正反射法により識別可能な、前記樹脂の赤外吸収スペクトル中の特性吸収ピーク波数における特性ピーク強度の違いによる、複数の目視不能な秘匿パターンからなる情報を付与することを特徴としている。
【0007】
本発明の秘匿情報を付与した印刷物は、前記複数のインキが、目視で同一色に見える同色インキであることを特徴としている。
【0008】
本発明の秘匿情報を付与した印刷物は、銀行券、株券又は債権の有価証券類、各種証明書類、パスポート又はカードである。
【0009】
本発明の秘匿情報を付与した印刷物は、前記インキに含有する樹脂の種類は、アルキド樹脂、アクリレート樹脂、アクリル樹脂、スチレン樹脂、ビニル樹脂、アミノ樹脂、フェノール樹脂、ウレタン樹脂、ポリエステル樹脂、エポキシ樹脂、メラミン樹脂、フッ素系樹脂、シリコーン系樹脂、若しくはこれらの樹脂の共重合体、又はこれらの樹脂の混合物であることを特徴とする。前記樹脂の共重合体としては、スチレンアクリル樹脂等がある。
【0010】
これらの樹脂から成るインキを2種類以上組み合わせて、該組み合わせに秘匿情報を付与して印刷した印刷物を、赤外分光装置の顕微正反射法で測定し得られた赤外吸収スペクトルに前記特性吸収ピークが認識でき、かつそれぞれの樹脂の
特性吸収ピーク波数のズレが1cm−1以上好ましくは10cm−1以上となることで秘匿情報が抽出可能であり、非破壊で真偽判別が可能となる秘匿情報を付与した印刷物を提供するものである。ここでの特性吸収ピーク強度は、各ピーク面積、各ピークのピークトップの強度及び他の基準ピーク強度又は基準ピーク面積との相対強度比又は相対面積比によって表すことができる。
【0011】
本発明は、秘匿情報を付与した印刷物の識別方法であって、前記秘匿情報を付与した印刷物を、赤外分析法における非破壊及び非接触検査である顕微正反射法により測定し、得られた赤外吸収スペクトルから前記印刷物のインキ中の樹脂の特性吸収ピークの波数を識別し、これら樹脂の特性吸収ピークの波数における特性ピーク強度を印刷物上でマッピングを行うことにより、目視不能な秘匿パターンを画像として識別し、前記画像の組み合わせによる情報により、前記印刷物の真偽判別を行うことを特徴とする秘匿情報を付与した印刷物の識別方法である。
【0012】
【発明の実施の形態】
本発明は、秘匿情報を付与した印刷物に関するものである。その印刷物は印刷対象である基材上に複数のインキを組み合わせて印刷する。前記印刷物に使用されるインキには着色成分の他に樹脂が含有され、夫々のインキに含有される樹脂の種類は互いに異なるものを使用する。これらの樹脂は、赤外分析法における非破壊及び非接触検査法である顕微正反射法により測定した赤外吸収スペクトル中の特性吸収ピークの波数で表されるスペクトルの位置が、夫々固有の波数を有し、特性吸収ピークの波数で表されるスペクトルの位置における特性吸収ピーク強度が異なる。本発明は、インキに含有する樹脂の前記特性吸収ピークが夫々固有の波数を有し、特性吸収ピークの波数で表されるスペクトルの位置における特性ピーク強度が異なる点を利用して、前記樹脂の特性吸収ピーク強度を印刷物上でマッピングを行うことにより得られた画像を、秘匿情報として用いるものである。前記印刷物は特性吸収ピークの波数における特性吸収ピーク強度が異なるものを組み合わせて用いるので、前記印刷物には樹脂による特性吸収ピーク強度の違いから異なった画像を得ることが可能であるので、前記印刷物に秘匿情報が付与されることとなり、より高度な偽造防止効果が得られる。樹脂を組み合わせる場合、各樹脂の特性吸収ピーク波数の違いが、波数にして10cm−1程度あれば、インキの樹脂の違いを特性吸収ピーク強度としてマッピング操作によって画像として識別することができる。
【0013】
本発明において、基材としては、紙、プラスチック、金属等印刷できるものなら種類を問わない。また、本発明における印刷物とは、有価証券類としては銀行券、商品券、図書券、小切手、株券又は債権等を、各種証明書としては身分証明書、印鑑登録証明書、免許証、権利証書又は住民票等を、また、入場券、回数券、チケット、免許証、パスポート又はカード類をいうが、特にこれらに限定されることなく、セキュリティ付与が必要な各種印刷物に適用されるのはいうまでもない。また、カード類としては、クレジットカード、IDカード、キャッシュカード、プリペイドカード、テレホンカード、交通機関で使用される乗車カード等を挙げることができる。
【0014】
【実施例】
以下、実施例に基づき本発明を詳細に説明するが、本発明はこの実施例によってなんら限定されるものではない。また、本発明の樹脂が互いに異なるインキから成る印刷物の印刷方式は、凸版、凹版、オフセット、ザンメル、スクリーン又はグラビア印刷等特に限定されない。
【0015】
また、本発明の樹脂の種類が異なるインキを組み合わせて印刷して得られた印刷物に使用できる樹脂としては、印刷物の赤外吸収スペクトルとして得られるピークが、インキに含まれる顔料、添加剤等の他成分ピークと重複することなく単独で認識できる樹脂を選定することが望ましいが、重複する場合でも樹脂の特性吸収が認識できるならば、アルキド樹脂、アクリル樹脂、アクリレート樹脂、ウレタン樹脂、エポキシ樹脂、ビニル樹脂又はフェノール樹脂等、一般に使用されている樹脂を使用することができる。また、樹脂の組み合わせは、赤外吸収スペクトルの特性吸収ピークトップが重なり合わない樹脂同士ならば任意に選択して組み合わせることができる。
【0016】
(実施例1) 図1は、基材(1)の上に、樹脂の種類が異なるインキを用いて情報(本実施例では「EX」)を凹版印刷し、それ以外の部分をオフセット印刷(2)した印刷物を示すものである。該印刷物の情報としての文字「EX」のうち、文字E(3)はインキにアルキド樹脂を使用して印刷した文字であり、文字X(4)はインキにアクリレート樹脂を使用して印刷した文字である。また、アルキド樹脂インキの配合割合は着色顔料としてピンク系顔料0.5重量部、体質顔料として硫酸バリウム及びチタン白60重量部、乾燥剤2.5重量部及び樹脂37重量部であり、アクリレート樹脂インキの配合割合は着色顔料としてピンク系顔料0.5重量部、体質顔料として硫酸バリウム及びチタン白60重量部、重合開始剤3重量部及び樹脂36.5重量部である。
【0017】
前記印刷物の文字E(3)と文字X(4)の印刷部のそれぞれを、赤外分光による測定法の一つである顕微正反射法により測定すると、図2に示すように、文字Eの正反射の赤外吸収スペクトル(5)と、文字Xの正反射の赤外吸収スペクトル(6)として得られる。そして、文字E(3)に用いたアルキド樹脂のC=O伸縮振動による正反射の特性吸収ピークは1760cm−1付近に、また、文字X(4)に用いたアクリレート樹脂のC=O伸縮振動による正反射の特性吸収ピークは1730cm−1付近にあり、それぞれの樹脂の特性吸収ピークがずれているのが分かる。そこで、文字E(3)の赤外吸収スペクトル(5)中の1760cm−1付近のアルキド樹脂のC=O伸縮振動による正反射の特性吸収ピーク強度(7)領域をピクセルサイズ25オm×25オm、ピクセル数393×259でマッピングを行うと、図3に示すようなマッピング像が得られる。このように、赤外分光による測定法の一つである顕微正反射法を用いることにより、アルキド樹脂を用いたインキで印刷した文字Eを画像として表すことができる。
【0018】
次に図4に示す文字X(4)の正反射の赤外吸収スペクトル(6)中の1730cm−1付近のアクリレート樹脂のC=O伸縮振動による正反射の特性吸収ピーク強度(8)領域をピクセルサイズ25オm×25オm、ピクセル数393×259でマッピングを行うと、図5に示すようなマッピング像が得られる。このように、赤外分光による測定法の一つである顕微正反射法を用いることにより、ここではアクリレート樹脂を用いたインキで印刷した文字Xを画像として表すことができる。このように、目視では判別することができない樹脂の種類が互いに異なるインキを用いて情報を印刷し、該情報の部分に赤外線を照射すると、その部分に特有な正反射の赤外吸収スペクトルが得られ、用いた樹脂特有の正反射の特性吸収ピークが得られ、該ピークの強度領域をマッピングを行うことにより、前記情報を画像として識別することができ、該インキに含有される樹脂の種類の組み合わせの違いにより形成される樹脂の種類の組み合わせ情報を秘匿情報とすることにより、セキュリティ性の高い印刷物として使用できる。
【0019】
(実施例2) 図6に示す印刷物は、基材(1)の上に、同色で樹脂の種類が異なるインキを組み合わせて、例えば「10927119」を印刷する。この数字の一桁おきに交互に、例えば「1971」をアルキド樹脂インキ(9)で、例えば「0219」をアクリレート樹脂インキ(10)で印刷する。この印刷物は夫々の樹脂の赤外吸収スペクトルの特性吸収ピークの波数で表されるスペクトルの位置が秘匿情報部分として付与されている。そして、アルキド樹脂インキ(9)で印刷された数字は「年」を、アクリレート樹脂インキ(10)で印刷された数字は「月日」を、夫々表すものと予め取決めしておく、この取決めを知らない人は、単に数字が羅列して印刷されていると認識するだけで、これが生年月日を表す情報であると認識することはできない。そこで、全ての数字を含む印刷面を顕微正反射法によりそれぞれの樹脂の特性吸収ピーク強度によりマッピングを行う。アルキド樹脂の特性吸収ピーク強度のマッピング像からは「1971」の画像情報が得られる。また、アクリレート樹脂(10)の特性吸収ピーク強度のマッピング像からは「0219」の画像情報を得ることによって識別できる。そして、前記のように、アルキド樹脂インキ(8)の数字部分は「年」を、アクリレート樹脂インキ(9)で印刷された数字は「月日」を、夫々表すものであるから、前記印刷物に印刷されている数字の羅列は、生年月日が、1971年2月19日であると認識することができる。
【0020】
このように、樹脂の種類が異なるインキを用いて印刷する情報の配列は自由に組み合わせることができ、組み合わせは無限に存在することから、個人情報及び識別情報などの秘匿情報を印刷物に付与することができる。更に、印刷物に付与された該秘匿情報は、特定の者のみが知っていれば良く、一般の者には目視において該秘匿情報が付与されていることさえも分からない。たとえ、該秘匿情報が付与されていることが分かったとしても、個人情報及び識別情報等を読み取ることができないため、極めて機密保持性に優れていることになる。
【0021】
【発明の効果】
本発明の秘匿情報を付与した印刷物は、一般の印刷機やインキを用いて印刷することができるため、新しい装置の導入も必要とせず簡単に製造することができる。更に、赤外分光法の測定法の一つである顕微正反射法により秘匿情報を付与した印刷物の赤外吸収スペクトルを得て、インキ中の樹脂を画像として判別するため印刷物の識別を非破壊及び非接触で数分間の測定で簡易的に行うことが可能である。
【0022】
また、樹脂が異なる同色インキを任意に組み合わせることができることから、印刷物のデザインを損ねることがない。また、樹脂の異なるインキの組み合わせが限りなく存在するため、個人情報や識別情報等の秘匿情報を印刷物に付与することもできる。更に、目視による判別では前記印刷物のデザインにカモフラージュされてしまい、前記インキの組み合わせやそれに付与した識別情報を読み取ることができないが、本発明によれば、顕微正反射法によるマッピング測定後簡易的に画像として読み取ることができる。
【0023】
以上のことから、印刷物に付与した樹脂が異なるインキの組み合わせと該組み合わせに付与した識別情報を秘密にしておくことで、偽造及び改ざんに対し高い安全性を有しているので、銀行券、株券又は債権の有価証券類、各種証明書類、パスポート又はカードの機密保持性が必要とされる製品の真偽判別に適している。
【図面の簡単な説明】
【図1】本発明の実施例1を説明する図で、樹脂が異なるインキで情報を付与した印刷物を示す。
【図2】図1の文字E及び文字Xそれぞれの正反射の赤外吸収スペクトルとアルキド樹脂の特性吸収ピーク強度領域を示す。
【図3】図2のアルキド樹脂の特性吸収ピーク強度によるマッピング像を示す。
【図4】図1の文字E及び文字Xそれぞれの正反射の赤外吸収スペクトルとアクリレート樹脂の特性吸収ピーク強度領域を示す。
【図5】図4のアクリレート樹脂の特性吸収ピーク強度によるマッピング像を示す。
【図6】本発明の実施例2を説明する図で,一桁おきに交互にアルキド樹脂インキとアクリレート樹脂インキで印刷した秘匿情報を有する印刷物を示す。
【図7】アルキド樹脂の特性吸収ピーク強度によるマッピング像を示す。
【図8】アクリレート樹脂の特性吸収ピーク強度によるマッピング像を示す。
【符号の説明】
1  基材
2  オフセットインキで印刷した印刷部
3  アルキド樹脂インキで印刷した凹版印刷部
4  アクリレート樹脂インキで印刷した凹版印刷部
5  文字Eの正反射の赤外吸収スペクトル
6  文字Xの正反射の赤外吸収スペクトル
7  アルキド樹脂のC=O伸縮振動による正反射の特性吸収ピーク強度
8  アクリレート樹脂のC=O伸縮振動による正反射の特性吸収ピーク強度
9  アルキド樹脂インキで印刷した印刷部
10  アクリレート樹脂インキで印刷した印刷部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printed matter to which confidential information is added by combining inks of different resins, to which confidential information that cannot be visually recognized and to enable true / false discrimination, and to a method for identifying the confidential information, particularly banknotes This technology is suitable for securities such as stock certificates or bonds, various certificates, passports or cards.
[0002]
[Prior art]
The present inventor and the other inventor have previously used infrared spectroscopy as a measurement method capable of qualitatively and quantitatively measuring substances such as resins and pigments without using special materials such as fluorescent materials. Using a total reflection method, which is one of the methods, a method of discriminating the authenticity of a printed matter is identified by identifying the difference in resin components constituting the ink. (Japanese Patent Application No. 2001-243235). However, in the method using the total reflection absorption method, since the measurement must be performed in contact with the printed matter, the surface may be depressed in the case of soft printed matter, and it cannot be applied to the authenticity judgment of valuable products. I found that there was also. Further, the information obtained by the total reflection absorption method is information at one point of the printed matter, and there is a restriction that only the difference between the obtained infrared spectra can be compared.
[0003]
In addition, although a microscopic mapping method using a total reflection absorption method has been developed to obtain continuous information, that is, an image by a characteristic absorption peak of an infrared spectrum, a printed material is greatly affected by unevenness of the printed surface due to printing. Therefore, the detection sensitivity is poor and the measurement time is several tens of hours or more, which is not practical.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention has been made to solve the above-mentioned problems in the prior art, and is one of infrared spectroscopy methods that can obtain a difference in structural information of substances such as resins and pigments as a spectrum. The reflection method is used to identify the difference between the resin components of the ink. The advantage of this method is that, unlike the total reflection absorption method, it is possible to measure a sample (for example, a coating film on a metal or a printed matter printed on paper) in a non-contact manner and to measure a micro area on the order of μm. The point is that mapping measurement in which the measurement is scanned on the sample can be performed in a short time. For this reason, printed matter printed with ink using a resin that is a different type of resin and has a spectrum position represented by the characteristic absorption peak wavenumber of the infrared absorption spectrum is measured by the microspecular reflection method. It is possible to display the characteristic absorption peak intensity attributable to the method as an image, and by using this method, a non-destructive and non-contact measurement of a printed matter made of an ink having a different kind of resin makes it possible to obtain the resin constituting the ink. Can be identified as an image, and furthermore, since the difference between the resins cannot be visually discriminated, the type of the resin is different, and the characteristic absorption peak position of the infrared absorption spectrum of the resin also gives confidential information to a combination of inks different from each other. It is also possible.
[0005]
The present invention provides a printed matter to which confidential information has been added and a method for identifying the confidential information, wherein the authenticity is determined by giving the confidential information to the resin component constituting the ink as described above.
[0006]
Means to be Solved by the Invention
The printed matter to which the confidential information of the present invention is added, on the base material, the type of the resin contained in each of the plurality of inks is different, and the characteristic absorption peak wave numbers of the infrared absorption spectrum of the resin are different from each other. A printed matter printed in combination, the printed matter, which can be identified by a microscopic specular reflection method that is a non-destructive and non-contact inspection method in infrared analysis, in the characteristic absorption peak wavenumber in the infrared absorption spectrum of the resin It is characterized in that information composed of a plurality of invisible concealment patterns depending on differences in characteristic peak intensities is provided.
[0007]
The printed matter to which the confidential information is added according to the present invention is characterized in that the plurality of inks are the same color inks that look the same color visually.
[0008]
The printed matter provided with the confidential information of the present invention is banknotes, stock certificates or securities of bonds, various certificates, passports or cards.
[0009]
The printed matter provided with the confidential information of the present invention, the type of resin contained in the ink, alkyd resin, acrylate resin, acrylic resin, styrene resin, vinyl resin, amino resin, phenol resin, urethane resin, polyester resin, epoxy resin Melamine resin, fluorine resin, silicone resin, a copolymer of these resins, or a mixture of these resins. Examples of the resin copolymer include styrene acrylic resin.
[0010]
Two or more types of inks composed of these resins are combined, and the printed matter printed by adding confidential information to the combination is subjected to the above-mentioned characteristic absorption in an infrared absorption spectrum obtained by measurement using a microspecular reflection method of an infrared spectrometer. Since the peak can be recognized and the deviation of the characteristic absorption peak wave number of each resin is 1 cm -1 or more, preferably 10 cm -1 or more, confidential information can be extracted and non-destructive confidentiality can be determined. This is to provide a printed matter with information. Here, the characteristic absorption peak intensity can be represented by each peak area, the intensity of the peak top of each peak, and another reference peak intensity or a relative intensity ratio or a relative area ratio with the reference peak area.
[0011]
The present invention is a method for identifying a printed matter to which confidential information has been added, wherein the printed matter to which the confidential information has been added is measured by a microspecular reflection method, which is a non-destructive and non-contact inspection in infrared analysis. By identifying the wave number of the characteristic absorption peak of the resin in the ink of the printed matter from the infrared absorption spectrum, and mapping the characteristic peak intensity at the wave number of the characteristic absorption peak of the resin on the printed matter, an invisible concealed pattern is formed. This is a method for identifying a printed matter to which confidential information is added, wherein the printed matter is identified as an image, and the authenticity of the printed matter is determined based on information obtained by combining the images.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention relates to a printed matter to which confidential information is added. The printed matter is printed by combining a plurality of inks on a substrate to be printed. The ink used in the printed matter contains a resin in addition to the coloring component, and the types of the resin contained in each ink are different from each other. For these resins, the position of the spectrum represented by the wave number of the characteristic absorption peak in the infrared absorption spectrum measured by the microspecular reflection method, which is a non-destructive and non-contact inspection method in the infrared analysis method, has a unique wave number. And the characteristic absorption peak intensity at the position of the spectrum represented by the wave number of the characteristic absorption peak is different. The present invention utilizes the point that the characteristic absorption peak of the resin contained in the ink has a unique wave number, and the characteristic peak intensity at the position of the spectrum represented by the wave number of the characteristic absorption peak is different. An image obtained by mapping the characteristic absorption peak intensity on a printed material is used as confidential information. Since the printed matter is used in combination with those having different characteristic absorption peak intensities at the wave number of the characteristic absorption peak, the printed matter can have different images from the difference in the characteristic absorption peak intensity due to the resin. Since the confidential information is added, a higher anti-counterfeiting effect can be obtained. In the case of combining resins, if the difference in characteristic absorption peak wave number of each resin is about 10 cm -1 in terms of wave number, the difference in resin of the ink can be identified as an image by a mapping operation as the characteristic absorption peak intensity.
[0013]
In the present invention, any type of substrate can be used as long as it can be printed, such as paper, plastic, and metal. The printed matter in the present invention includes securities such as banknotes, gift certificates, book coupons, checks, stock certificates or receivables, and various certificates as identification cards, seal registration certificates, licenses, title certificates. Or a resident's card, etc., also refers to admission tickets, coupons, tickets, licenses, passports or cards, but is not particularly limited to these, and is applied to various printed materials that require security. Not even. Examples of the cards include a credit card, an ID card, a cash card, a prepaid card, a telephone card, and a boarding card used in transportation.
[0014]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. In addition, the printing method of the printed matter in which the resin of the present invention is made of different inks is not particularly limited, such as letterpress, intaglio, offset, zammel, screen or gravure printing.
[0015]
Further, as a resin that can be used for a printed matter obtained by printing by combining different kinds of inks of the resin of the present invention, a peak obtained as an infrared absorption spectrum of the printed matter includes a pigment contained in the ink, an additive, and the like. It is desirable to select a resin that can be recognized alone without overlapping with other component peaks, but if the characteristic absorption of the resin can be recognized even when overlapping, alkyd resin, acrylic resin, acrylate resin, urethane resin, epoxy resin, A commonly used resin such as a vinyl resin or a phenol resin can be used. The combination of resins can be arbitrarily selected and combined as long as the resins do not overlap the characteristic absorption peak tops of the infrared absorption spectrum.
[0016]
(Example 1) FIG. 1 shows intaglio printing of information (“EX” in this example) on a base material (1) using inks of different types of resin, and offset printing of other portions ( 2) shows the printed material. Among the characters “EX” as information of the printed matter, the character E (3) is a character printed using an alkyd resin for the ink, and the character X (4) is a character printed using an acrylate resin for the ink. It is. The mixing ratio of the alkyd resin ink is 0.5 parts by weight of a pink pigment as a color pigment, 60 parts by weight of barium sulfate and titanium white as an extender, 2.5 parts by weight of a desiccant, and 37 parts by weight of an acrylate resin. The mixing ratio of the ink was 0.5 parts by weight of a pink pigment as a color pigment, 60 parts by weight of barium sulfate and titanium white as an extender, 3 parts by weight of a polymerization initiator, and 36.5 parts by weight of a resin.
[0017]
When each of the printed portions of the characters E (3) and X (4) of the printed matter was measured by the micro-specular reflection method, which is one of the measurement methods using infrared spectroscopy, as shown in FIG. It is obtained as a regular reflection infrared absorption spectrum (5) and a regular reflection infrared absorption spectrum of character X (6). The characteristic absorption peak of specular reflection due to the C = O stretching vibration of the alkyd resin used in the character E (3) is around 1760 cm −1 , and the C = O stretching vibration of the acrylate resin used in the character X (4) It can be seen that the characteristic absorption peak of specular reflection due to is around 1730 cm −1 , and the characteristic absorption peak of each resin is shifted. Therefore, the characteristic absorption peak intensity (7) of specular reflection due to C = O stretching vibration of the alkyd resin near 1760 cm -1 in the infrared absorption spectrum (5) of the character E (3) is defined as a pixel size of 25 m × 25. When the mapping is performed with m and the number of pixels is 393 × 259, a mapping image as shown in FIG. 3 is obtained. As described above, by using the microspecular reflection method, which is one of the measurement methods using infrared spectroscopy, the character E printed with the ink using the alkyd resin can be represented as an image.
[0018]
Next, in the infrared absorption spectrum (6) of the regular reflection of the character X (4) shown in FIG. 4, the characteristic absorption peak intensity (8) region of the regular reflection due to the C = O stretching vibration of the acrylate resin near 1730 cm -1 is shown. When mapping is performed with a pixel size of 25 m × 25 m and the number of pixels is 393 × 259, a mapping image as shown in FIG. 5 is obtained. As described above, by using the microspecular reflection method, which is one of the measurement methods using infrared spectroscopy, the character X printed with an ink using an acrylate resin can be represented as an image here. In this way, when information is printed using inks of different types of resins, which cannot be distinguished visually, and the information portion is irradiated with infrared light, a specular reflection infrared absorption spectrum unique to that portion is obtained. The characteristic absorption peak of specular reflection characteristic of the resin used is obtained, and by mapping the intensity region of the peak, the information can be identified as an image, and the type of the resin contained in the ink can be identified. By using confidential information as the combination information of the types of resin formed by the difference in combination, it can be used as a printed matter with high security.
[0019]
Example 2 The printed matter shown in FIG. 6 is formed by printing, for example, “10927119” on the base material (1) by combining inks of the same color and different kinds of resin. For example, "1971" is printed with the alkyd resin ink (9), and "0219" is printed with the acrylate resin ink (10) alternately every other digit. In this printed matter, the position of the spectrum represented by the wave number of the characteristic absorption peak of the infrared absorption spectrum of each resin is given as a secret information portion. The number printed with the alkyd resin ink (9) represents "year", and the number printed with the acrylate resin ink (10) represents "month and day". An unknown person simply recognizes that the numbers are printed in a row and cannot recognize that this is information representing the date of birth. Therefore, the printing surface including all the numbers is mapped by the specular reflection method based on the characteristic absorption peak intensity of each resin. From the mapping image of the characteristic absorption peak intensity of the alkyd resin, image information of “1971” is obtained. In addition, from the mapping image of the characteristic absorption peak intensity of the acrylate resin (10), it can be identified by obtaining image information of “0219”. And, as described above, the numeral portion of the alkyd resin ink (8) represents "year" and the numeral printed with the acrylate resin ink (9) represents "month and day". It is possible to recognize that the date of birth is February 19, 1971 in the printed list of numbers.
[0020]
In this way, the arrangement of information to be printed using inks of different types of resins can be freely combined, and since there are infinite combinations, it is necessary to provide confidential information such as personal information and identification information to printed matter. Can be. Further, only the specific person needs to know the confidential information given to the printed matter, and a general person cannot visually recognize that the confidential information is added. Even if it is found that the confidential information has been given, personal information and identification information cannot be read, so that the confidentiality is extremely excellent.
[0021]
【The invention's effect】
Since the printed matter provided with the confidential information of the present invention can be printed using a general printing machine or ink, it can be easily manufactured without introducing a new device. Furthermore, the infrared spectroscopy method, one of the measurement methods of infrared spectroscopy, is used to obtain the infrared absorption spectrum of the printed matter to which confidential information has been added, and the identification of the printed matter is non-destructive in order to distinguish the resin in the ink as an image. In addition, the measurement can be performed simply by measuring for several minutes without contact.
[0022]
Further, since the same color inks of different resins can be arbitrarily combined, the design of the printed matter is not spoiled. Further, since there are endless combinations of inks of different resins, confidential information such as personal information and identification information can be added to the printed matter. Furthermore, in the discrimination by visual inspection, the printed matter is camouflaged and the combination of the inks and the identification information given to the combination cannot be read. Can be read as an image.
[0023]
From the above, the resin applied to the printed matter has a high security against forgery and tampering by keeping the combination of different inks and the identification information given to the combination confidential. Or, it is suitable for authenticity determination of products that require security of securities of bonds, various certificates, passports or cards.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a first embodiment of the present invention, showing a printed matter to which information is added with inks of different resins.
FIG. 2 shows an infrared absorption spectrum of specular reflection of each of characters E and X of FIG. 1 and a characteristic absorption peak intensity region of an alkyd resin.
FIG. 3 shows a mapping image based on characteristic absorption peak intensity of the alkyd resin of FIG.
4 shows an infrared absorption spectrum of specular reflection of each of characters E and X in FIG. 1 and a characteristic absorption peak intensity region of an acrylate resin.
5 shows a mapping image based on the characteristic absorption peak intensity of the acrylate resin of FIG.
FIG. 6 is a view for explaining Example 2 of the present invention, and shows a printed matter having confidential information printed with an alkyd resin ink and an acrylate resin ink alternately every other digit.
FIG. 7 shows a mapping image based on the characteristic absorption peak intensity of the alkyd resin.
FIG. 8 shows a mapping image based on the characteristic absorption peak intensity of the acrylate resin.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Base material 2 Printed part printed with offset ink 3 Intaglio printed part printed with alkyd resin ink 4 Intaglio printed part printed with acrylate resin ink 5 Infrared absorption spectrum of regular reflection of letter E 6 Red regular reflection of letter X External absorption spectrum 7 Characteristic absorption peak intensity of regular reflection due to C = O stretching vibration of alkyd resin 8 Characteristic absorption peak intensity of regular reflection due to C = O stretching vibration of acrylate resin 9 Printed part 10 printed with alkyd resin ink 10 Acrylic resin ink Printing section printed with

Claims (5)

基材上に、複数のインキに各々含有する樹脂の種類が異なり、前記樹脂の赤外吸収スペクトルの特性吸収ピーク波数も互いに異なる、前記複数のインキを組み合わせて印刷した印刷物であって、前記印刷物は、赤外分析法における非破壊及び非接触検査法である顕微正反射法により識別可能な、前記樹脂の赤外吸収スペクトル中の特性吸収ピーク波数における特性ピーク強度の違いによる、複数の目視不能な秘匿パターンからなる情報を有することを特徴とする秘匿情報を付与した印刷物。A printed matter printed by combining the plurality of inks on a substrate, wherein the types of resins contained in the plurality of inks are different from each other, and the characteristic absorption peak wave numbers of the infrared absorption spectrum of the resin are also different from each other. Is a non-destructive and non-contact inspection method in the infrared analysis method can be identified by the microspecular reflection method, due to differences in the characteristic peak intensity at the characteristic absorption peak wave number in the infrared absorption spectrum of the resin, a plurality of invisible A printed matter to which confidential information is added, characterized in that the printed matter has information composed of various confidential patterns. 前記複数のインキは、目視で同一色に見える同色インキであることを特徴とする請求項1記載の秘匿情報を付与した印刷物。The printed matter to which confidential information has been added, wherein the plurality of inks are inks of the same color that appear to be the same color visually. 前記印刷物が、銀行券、株券又は債権の有価証券類、各種証明書類、パスポート又はカードであることを特徴とする請求項1又は2に記載の秘匿情報を付与した印刷物。The printed matter to which confidential information has been added according to claim 1 or 2, wherein the printed matter is banknotes, stock certificates or securities of bonds, various certificates, passports or cards. 前記インキに含有する樹脂の種類は、アルキド樹脂、アクリレート樹脂、アクリル樹脂、スチレン樹脂、ビニル樹脂、アミノ樹脂、フェノール樹脂、ウレタン樹脂、ポリエステル樹脂、エポキシ樹脂、メラミン樹脂、フッ素系樹脂、シリコーン系樹脂、若しくはこれらの樹脂の共重合体、又はこれらの樹脂の混合物であることを特徴とする請求項1、2又は3に記載の秘匿情報を付与した印刷物。The types of resins contained in the ink include alkyd resins, acrylate resins, acrylic resins, styrene resins, vinyl resins, amino resins, phenol resins, urethane resins, polyester resins, epoxy resins, melamine resins, fluorine resins, and silicone resins. The printed matter provided with confidential information according to claim 1, 2 or 3, which is a copolymer of these resins, or a mixture of these resins. 請求項1、2、3又は4に記載の秘匿情報を付与した印刷物の識別方法であって、
前記秘匿情報を付与した印刷物を、赤外分析法における非破壊及び非接触検査法である顕微正反射法により測定し、得られた赤外吸収スペクトルから前記印刷物のインキ中の樹脂の特性吸収ピークの波数を識別し、これら樹脂の特性吸収ピークの波数における特性ピーク強度を印刷物上でマッピングを行うことにより、目視不能な秘匿パターンを画像として識別し、前記画像の組み合わせによる情報により、前記印刷物の真偽判別を行うことを特徴とする秘匿情報を付与した印刷物の識別方法。
A method for identifying a printed matter provided with confidential information according to claim 1, 2, 3, or 4,
The printed matter provided with the confidential information is measured by a microspecular reflection method, which is a non-destructive and non-contact inspection method in infrared analysis, and the characteristic absorption peak of the resin in the ink of the printed matter is obtained from the obtained infrared absorption spectrum. By identifying the wave number of the characteristic peak intensity at the wave number of the characteristic absorption peak of these resins on a printed material, an invisible concealed pattern is identified as an image, and information based on a combination of the images is used to identify the printed material. A method of identifying a printed matter to which confidential information is added, which performs authenticity determination.
JP2002170104A 2002-06-11 2002-06-11 Prints involving concealed information and method of identifying concealed information Pending JP2004009694A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005246821A (en) * 2004-03-05 2005-09-15 National Printing Bureau Printed matter, and equipment and device for discrimination thereof
JP2008045231A (en) * 2006-08-14 2008-02-28 National Printing Bureau Multi-layered sheet and method for determining true or false
JP2011515688A (en) * 2008-03-28 2011-05-19 ドリッテ パテントポートフォーリオ ベタイリグングスゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト Manufacturing method of surface sensor, surface sensor system and use of surface sensor
JP2014071044A (en) * 2012-09-28 2014-04-21 Glory Ltd Method and device for adjusting optical system of spectrum sensor, and paper sheet recognition apparatus
CN104553453A (en) * 2013-10-10 2015-04-29 张艳 Personal information protection type express bill
JP2017133988A (en) * 2016-01-29 2017-08-03 東洋インキScホールディングス株式会社 Authenticity discrimination method and authenticity discrimination device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005246821A (en) * 2004-03-05 2005-09-15 National Printing Bureau Printed matter, and equipment and device for discrimination thereof
JP2008045231A (en) * 2006-08-14 2008-02-28 National Printing Bureau Multi-layered sheet and method for determining true or false
JP2011515688A (en) * 2008-03-28 2011-05-19 ドリッテ パテントポートフォーリオ ベタイリグングスゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト Manufacturing method of surface sensor, surface sensor system and use of surface sensor
JP2014071044A (en) * 2012-09-28 2014-04-21 Glory Ltd Method and device for adjusting optical system of spectrum sensor, and paper sheet recognition apparatus
CN104553453A (en) * 2013-10-10 2015-04-29 张艳 Personal information protection type express bill
JP2017133988A (en) * 2016-01-29 2017-08-03 東洋インキScホールディングス株式会社 Authenticity discrimination method and authenticity discrimination device

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