JP2005262681A - Forgery preventing printed matter - Google Patents

Forgery preventing printed matter Download PDF

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JP2005262681A
JP2005262681A JP2004078994A JP2004078994A JP2005262681A JP 2005262681 A JP2005262681 A JP 2005262681A JP 2004078994 A JP2004078994 A JP 2004078994A JP 2004078994 A JP2004078994 A JP 2004078994A JP 2005262681 A JP2005262681 A JP 2005262681A
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ink
printed matter
fluorescent
light
printed
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JP4418881B2 (en
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Hiroki Kono
裕樹 河野
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National Printing Bureau
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the flow of a forged printed matter on the market accompanying high development of copying and reproducing techniques in recent years, to achieve marketing of fluorescent luminescence ink having an effect of forgery prevention in relation to high development of a digital technique and the like and a further advance of a forgery preventing technique against the forged printed matter using the fluorescent luminescence ink, and thus to enhance the effect of forgery prevention. <P>SOLUTION: First and second printing areas are printed respectively with the fluorescent luminescence ink being colorless or of the same color under natural light and luminous in the same color under ultraviolet rays. When the luminous color is observed through a filter 9, the two kinds of fluorescent luminescence ink which are seen ordinarily as only one color are luminous differently from each other and thereby the first printing area 1a and the second printing area 2a can be distinguished from each other. Therefore it is possible to read hidden information or the like and to perform discrimination as to authenticity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、有価証券、証明書、入場券または各種チケット等の印刷物において、カラー複写機またはパーソナルコンピュータとカラープリンタ等による偽造を困難にし、特定の条件下のみ識別可能であって、自然状態では識別不可能なインキで印刷されている印刷物に関する。   The present invention makes it difficult to forge a printed matter such as securities, certificates, admission tickets or various tickets by a color copier or personal computer and a color printer, and can be identified only under specific conditions. The present invention relates to a printed matter printed with indistinguishable ink.

偽造防止用印刷物として分光反射率の異なった色でも照明条件によっては同色になるが、ある照明光源下では同色である色同士でも分光エネルギー分布の異なった他の光源下では全く異なった色に見える現象をメタメリズムと言う。   Even for colors with different spectral reflectances as anti-counterfeit prints, the colors will be the same depending on the lighting conditions, but colors that are the same color under a certain illumination light source appear to be completely different under other light sources with a different spectral energy distribution The phenomenon is called metamerism.

このようなメタメリズムの原理を応用し、分光反射率の波長ピークが異なる２種類以上のインキを使い自然光下では各インキ発色がほぼ同一である印刷物であり、複写機等の機械読取を行うと各インキが異なる色に再現される偽造防止印刷物は周知である。しかし、デジタル技術の高度化により、印刷物が容易に複製できるようになってきている。   Applying this principle of metamerism, using two or more types of inks with different spectral reflectance wavelength peaks, each ink color is almost the same under natural light. Anti-counterfeit prints in which ink is reproduced in different colors are well known. However, with the advancement of digital technology, printed materials can be easily copied.

一方、蛍光発光インキは紫外線によって発光することから、蛍光発光インキを使用した印刷物はカラー複写機等に対する偽造防止効果が高く、多くの有価証券等に使用されている。しかし、近年では蛍光発光インキさえも使用した偽造印刷物が出回りはじめ、単に紫外線により蛍光発光するという機能だけでは大きな偽造防止効果は望めなくなってきている。   On the other hand, since the fluorescent light-emitting ink emits light by ultraviolet rays, printed matter using the fluorescent light-emitting ink has a high anti-counterfeiting effect on a color copying machine or the like, and is used in many securities. In recent years, however, counterfeit printed matter using even fluorescent light-emitting ink has begun to appear, and it has become impossible to expect a great anti-counterfeit effect simply by the function of emitting fluorescence by ultraviolet rays.

ところで、従来、偽造防止のための印刷法として、次のような内容の二重機密印刷法に係る発明がすでに提案されている（特許文献１参照）。この二重機密印刷法は、青色系発光物質を以て第１種印刷面を構成すると共に、 赤色系発光物質を以て第２種印刷面を構成するものである。これら第１種印刷面と第２種印刷面は、それぞれ別個のスペースを占める必要はなく、重ね刷りでも差し支えないとしている。   Conventionally, as a printing method for preventing counterfeiting, an invention relating to the double confidential printing method having the following contents has already been proposed (see Patent Document 1). In this double confidential printing method, the first type printing surface is configured with a blue light emitting material, and the second type printing surface is configured with a red light emitting material. The first-type printing surface and the second-type printing surface need not occupy separate spaces, and may be overprinted.

ここで、青色系発光物質は、昼光下で不可視で、２００〜４００ｎｍの範囲内に励起波長スペクトルの主ピークを有し、４００〜４５０ｎｍの範囲内に発光波長スペクトルの主ピークを有する発光物質又はこれを有する物質である。   Here, the blue light-emitting substance is invisible under daylight, has a main peak of the excitation wavelength spectrum in the range of 200 to 400 nm, and has a main peak of the emission wavelength spectrum in the range of 400 to 450 nm. Or it is a substance which has this.

そして、赤色系発光物質は、昼光下で不可視で、２００〜４００ｎｍの範囲内に励起波長スペクトルの主ピークを有し、５００〜６５０ｎｍの範囲内に発光波長スペクトルの主ピークを有する発光物質又はこれを有する物質である。   The red light-emitting substance is invisible under daylight, has a main peak of the excitation wavelength spectrum in the range of 200 to 400 nm, and has a main peak of the emission wavelength spectrum in the range of 500 to 650 nm, or It is a substance having this.

このような二重機密印刷法によると、昼光下では不可視であり、紫外線照射下では、青の輝度が赤の輝度を覆い、一見青しか見えないようにすることで、同じように発光し、識別は不可能であるが、５００ｎｍ以下の波長を遮蔽するフィルタを以てはじめて第２種印刷面の表示を識別できる。   According to such a double confidential printing method, it is invisible under daylight, and under ultraviolet irradiation, the blue luminance covers the red luminance so that only blue appears at first glance. Although the identification is impossible, the display on the second type printing surface can be identified only with a filter that shields the wavelength of 500 nm or less.

特開昭５０−６４１０号公報Japanese Patent Laid-Open No. 50-6410

ところで、特許文献１記載のものは、紫外線照射下では、青の輝度が赤の輝度を覆い一見青しか見えないようにすることで、第１種印刷面及び第２種印刷面の識別を不可能とするものである。従って、第１種印刷面と第２種印刷面とを重ね刷りする場合は、印刷領域が重なるので青の輝度が赤の輝度を覆い、一見青しか見えないという現象は生じ易い。
しかしながら、第１種印刷面と第２種印刷面がそれぞれ別個のスペースを占める、要するに同一平面においてずらして印刷される面である場合は、第１種印刷面と第２種印刷面のスペースの大きさやずらしかたにもよるが、青の輝度が平面的に隣接する赤の輝度まで完全に覆うという現象は必ずしも生じにくいので、「紫外線照射下でも第１種印刷面と第２種印刷面の識別を不可能とする」という効果が十分には奏し得ないという問題があった。 By the way, according to the method described in Patent Document 1, under the ultraviolet irradiation, the blue luminance covers the red luminance so that only blue can be seen at first glance, thereby making it impossible to distinguish between the first type printing surface and the second type printing surface. It is possible. Therefore, when the first-type printing surface and the second-type printing surface are overprinted, since the print areas overlap, the phenomenon that the blue luminance covers the red luminance and only blue at first glance is likely to occur.
However, when the first-type printing surface and the second-type printing surface occupy separate spaces, that is, when the first-type printing surface and the second-type printing surface are printed in a shifted manner on the same plane, Depending on the size and how it is shifted, the phenomenon that the brightness of blue completely covers the brightness of red that is adjacent in a plane is not necessarily generated. There was a problem that the effect of “distinguishable” could not be sufficiently achieved.

本発明は、前記のような問題点を解決するためになされたもので、本発明の目的は、近年の複写、複製技術の高度化にともなう偽造印刷物の市場への出回りを防止するため、及びデジタル技術の高度化等に対する偽造防止効果的である蛍光発光インキの市販化及び蛍光発光インキを使用した偽造印刷物に対し、さらなる偽造防止技術の高度化を図り、偽造防止効果の強化を行うものである。 The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent counterfeit printed materials from entering the market due to the recent advancement of copying and copying technologies, and It is intended to strengthen the anti-counterfeiting effect by commercializing fluorescent light-emitting inks that are effective in preventing counterfeiting against the advancement of digital technology, etc. is there.

特に、特許文献１の技術では問題が残る第１種印刷面と第２種印刷面が同一平面においてずらして印刷される面であっても、紫外線照射下では両者の区別がつかないようにする構成を実現できるものである。   In particular, even if the first type printing surface and the second type printing surface, which are problematic in the technology of Patent Document 1, are printed on the same plane, they cannot be distinguished from each other under ultraviolet irradiation. The configuration can be realized.

本発明は、２以上の印刷領域を有し、前記２以上の印刷領域の少なくとも２つの印刷領域は、それぞれ異なる蛍光発光インキによって印刷された印刷物であって、前記蛍光発光インキのうちの少なくとも２種は、自然光下では目視で無色又は互いに同色を呈し、励起発光させるエネルギーの照射下における蛍光発光スペクトルが異なるが目視で互いに同色を呈するインキである印刷物を提供する。   The present invention has two or more print areas, and at least two of the two or more print areas are printed products that are printed with different fluorescent light-emitting inks, and at least two of the fluorescent light-emitting inks. The seeds provide a printed matter which is an ink which is visually colorless or has the same color under natural light and has a different fluorescence emission spectrum under irradiation of energy for exciting light emission but has the same color visually.

本発明は、蛍光発光インキの少なくとも１種は、少なくとも２以上のピークを示す蛍光発光スペクトルを有するインキである印刷物を提供する。   The present invention provides a printed matter in which at least one of the fluorescent light-emitting inks is an ink having a fluorescent light emission spectrum exhibiting at least two or more peaks.

本発明は、蛍光発光インキの少なくとも１種は、可視波長域において少なくとも２以上のピークを示す蛍光発光スペクトルを有するインキであることを特徴とする印刷物を提供する。   The present invention provides a printed matter characterized in that at least one of the fluorescent light-emitting inks is an ink having a fluorescent light emission spectrum showing at least two or more peaks in the visible wavelength region.

本発明は、蛍光発光インキの少なくとも１種は、２種以上の蛍光顔料を含有するインキである印刷物を提供する。   The present invention provides a printed matter in which at least one fluorescent light-emitting ink is an ink containing two or more fluorescent pigments.

本発明は、２種以上の蛍光顔料は、それぞれ異なる波長域にピークを示す蛍光発光スペクトルを有する顔料である印刷物を提供する。   The present invention provides a printed matter in which two or more fluorescent pigments are pigments having fluorescent emission spectra that show peaks in different wavelength ranges.

本発明は、２種以上の蛍光顔料は、それぞれ可視波長域において異なる波長域にピークを示す蛍光発光スペクトルを有する顔料である印刷物を提供する。   The present invention provides a printed matter in which two or more fluorescent pigments are pigments each having a fluorescence emission spectrum having peaks in different wavelength ranges in the visible wavelength range.

本発明の印刷物は、蛍光発光インキを使用すること自体が１つの偽造防止であるのに加え、２種類以上の蛍光発光インキの印刷領域を有していても、蛍光発光色が紫外線照射下では同色に確認でき、さらにフィルタ等を介することで各インキを識別することができる二重の偽造防止策を施してあるため、さらなる偽造防止の強化になる。   In addition to the fact that the use of the fluorescent light-emitting ink itself is one forgery prevention, the printed matter of the present invention has two or more types of fluorescent light-emitting ink printed areas, but the fluorescent light-emitting color is under ultraviolet irradiation. Double anti-counterfeit measures that can be confirmed with the same color and that can identify each ink through a filter or the like are provided, which further enhances anti-counterfeiting.

本発明の印刷物に付与されている文字、記号、バーコード等の情報は、自然光下および紫外線照射時において、使用する２種類以上の蛍光発光インキが無色または同色であるため、目視では判別できないが、色フィルタ、例えば、緑フィルタを用いることで瞬時に、且つ容易に情報を識別することができ、偽造防止印刷物として実用性が高い。 Information such as characters, symbols, and barcodes given to the printed matter of the present invention cannot be visually discerned because two or more kinds of fluorescent light-emitting inks used are colorless or the same color under natural light and when irradiated with ultraviolet rays. By using a color filter, for example, a green filter, information can be identified instantly and easily, and it is highly practical as an anti-counterfeit printed matter.

本発明の印刷物では、第１印刷領域の輝度が第２印刷領域の輝度を覆い一見同色に見せているのではなく、第１印刷領域および第２印刷領域が同色に蛍光発光するため、紫外線照射時の情報の識別は困難であり、また比較的自由な情報の付与が可能である。 In the printed matter of the present invention, the brightness of the first print area covers the brightness of the second print area and does not appear to be the same color at first, but the first print area and the second print area fluoresce in the same color. It is difficult to identify time information, and it is possible to give relatively free information.

本発明で使用しているインキは、以下に具体的に説明する特殊な偽造防止機能を発揮させるものであり、当然、複写機またはパーソナルコンピュータ等で利用する通常販売されているインキまたはトナーとは異なるものを使用することとなるから、容易に模倣することはできない。   The ink used in the present invention exhibits a special anti-counterfeiting function that will be described in detail below. Naturally, it is a normally sold ink or toner used in a copying machine or a personal computer. Since different things will be used, they cannot be imitated easily.

本発明を実施するための最良の形態を実施例に基づいて図面を参照して以下に説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings based on the embodiments.

基材上に第１インキを用いて第１印刷領域１を印刷し、同一基材上に第２インキを用いて第２印刷領域２を印刷して、印刷物を得る。例えば、図１の（ａ）及び（ｂ）のような第１印刷領域１及び第２印刷領域２を、図２に示すように基材５の上に、第１インキを用いて第１印刷領域１’を、第２インキを用いて第２印刷領域２’をそれぞれ印刷して、印刷物Ａを得る。   The 1st printing area | region 1 is printed on the base material using 1st ink, and the 2nd printing area | region 2 is printed on the same base material using 2nd ink, and printed matter is obtained. For example, the first printing area 1 and the second printing area 2 as shown in FIGS. 1A and 1B are printed on the substrate 5 using the first ink as shown in FIG. The printed matter A is obtained by printing the region 1 ′ and the second printing region 2 ′ using the second ink.

第１インキは、主に波長２００ｎｍ〜３２０ｎｍの波長領域の光を照射すると励起発光し、ＣａＳｉＯ３：Ｍｎ，Ｐｂを構造とした紫外励起可視発光顔料（紫外線で励起されると可視状態に発光する蛍光顔料）である「第１の顔料」を使用して作製する。   The first ink emits light when irradiated with light having a wavelength range of 200 nm to 320 nm, and is an ultraviolet excited visible light emitting pigment having a structure of CaSiO3: Mn, Pb (fluorescence that emits light in a visible state when excited with ultraviolet light). Pigment) is used to make the first pigment.

この第１の顔料は、上記波長領域の紫外線を照射することにより、図５に示すような、可視領域で橙色に発光する蛍光発光スペクトルを示す。このような第１の顔料を含む第１インキは、可視領域である自然光の下では無色であるが、紫外線を照射することにより図８中の蛍光発光スペクトル１３を示し、橙色に発光する。   This first pigment exhibits a fluorescence emission spectrum that emits orange light in the visible region as shown in FIG. 5 when irradiated with ultraviolet rays in the above wavelength region. The first ink containing such a first pigment is colorless under natural light in the visible region, but exhibits a fluorescence emission spectrum 13 in FIG. 8 when irradiated with ultraviolet rays, and emits orange light.

第２インキは、主に励起波長２００ｎｍ〜３２０ｎｍの波長域の光を照射するとそれぞれ励起発光し、Ｚｎ２ＳｉＯ４：ＭｎとＹ２Ｏ３：Ｅｕを構造とした２種類の紫外励起可視発光顔料（紫外線で励起されると可視状態に発光する蛍光顔料）である「第２の顔料」及び「第３の顔料」を用いて作製する。   The second ink mainly emits excitation light when irradiated with light having an excitation wavelength of 200 nm to 320 nm, and two kinds of ultraviolet excitation visible light emitting pigments (excited by ultraviolet rays) having a structure of Zn2SiO4: Mn and Y2O3: Eu. And a “second pigment” and a “third pigment” which are fluorescent pigments that emit light in a visible state.

第２の顔料及び第３の顔料は、それぞれ上記波長領域の紫外線を照射することにより図６及び図７に示すような、可視領域では黄緑色及び赤色に発光する蛍光発光スペクトル１１、１２を示す。このような第２の顔料及び第３の顔料を含む第２インキは、第１インキと同様に、可視領域である自然光の下では無色であるが、紫外線を照射することにより図８中の蛍光発光スペクトル１４を示す。   The second pigment and the third pigment show fluorescence emission spectra 11 and 12 that emit yellow-green and red light in the visible region as shown in FIGS. . Like the first ink, the second ink containing the second pigment and the third pigment is colorless under natural light in the visible region, but the fluorescence in FIG. An emission spectrum 14 is shown.

第２インキは、第２の顔料と第３の顔料が含まれているから、その蛍光発光スペクトル１４は、黄緑色及び赤色のそれぞれの色の発光強度にピークを有する。そして、これらの発光色が加法混色することで、第１インキの発光色である橙色と同等の色みを呈して見えるように、第２インキは、第２の顔料と第３の顔料を適量配合して作製される。   Since the second ink contains the second pigment and the third pigment, the fluorescence emission spectrum 14 has a peak in the emission intensity of each of yellow-green and red. In addition, the second ink contains an appropriate amount of the second pigment and the third pigment so that these luminescent colors are additively mixed and appear to have the same color as the orange luminescent color of the first ink. Made by blending.

第１インキの配合例を表１に示し、第２インキの配合例を表２に示す。   A blending example of the first ink is shown in Table 1, and a blending example of the second ink is shown in Table 2.

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（作用）
図２に示す印刷物Ａの第１印刷領域１’及び第２印刷領域２’の印刷に使用された第１インキ及び第２インキは、可視領域である自然光の下ではともに無色であるため、第１印刷領域１’及び第２印刷領域２’は自然光下においては、不可視であり、第１印刷領域１’及び第２印刷領域２’は互いに識別できない。 (Function)
Since the first ink and the second ink used for printing the first print region 1 ′ and the second print region 2 ′ of the printed matter A shown in FIG. 2 are both colorless under the natural light that is the visible region, The first print area 1 ′ and the second print area 2 ′ are invisible under natural light, and the first print area 1 ′ and the second print area 2 ′ cannot be distinguished from each other.

この印刷物Ａに対して紫外線、具体的には、本実施例で使用している蛍光顔料の励起波長が２００ｎｍ〜３２０ｎｍであるから、通常、短波紫外線といわれている２５４ｎｍの紫外線を照射する。すると、第１インキ及び第２インキは、前述のとおり橙色で同色を呈して発光するようにそれぞれ顔料が配合されているから、第１印刷領域及び第２印刷領域は互いに同色に見え、図３に示すような１つの印刷領域７としてのみ確認ができる。   The printed matter A is irradiated with ultraviolet rays, specifically, with the excitation wavelength of the fluorescent pigment used in the present embodiment being 200 nm to 320 nm, and thus usually 254 nm ultraviolet rays, which are called short wave ultraviolet rays, are irradiated. Then, since the first ink and the second ink are mixed with pigments so as to emit light with the same color in orange as described above, the first printing area and the second printing area appear to be the same color, and FIG. Only one print area 7 as shown in FIG.

このような紫外線照射下で、図９に示すような分光スペクトル１５または分光スペクトル１６を有する一般的な緑フィルタまたは青フィルタを介して印刷物Ａを確認すると、図４に示すように、各印刷領域は、互いに異なる色みを呈した第１印刷領域１ａ及び第２印刷領域２ａとして、確認ができる。   When the printed matter A is confirmed through a general green filter or blue filter having the spectral spectrum 15 or the spectral spectrum 16 as shown in FIG. 9 under such ultraviolet irradiation, as shown in FIG. Can be confirmed as the first print area 1a and the second print area 2a exhibiting different colors.

例えば、緑フィルタを用いて、印刷物Ａを観察する場合についてさらに詳細に説明する。緑フィルタは図９において分光スペクトル１５で示され、４７０〜６００ｎｍの波長域の光に対しては比較的高い透過特性を示すが、その他の波長領域（７００ｎｍを超える波長領域を除く。）の光に対しては低い透過特性を示し（但し、透過率は０％ではない。）、その透過が比較的抑制される。   For example, the case where the printed matter A is observed using a green filter will be described in more detail. The green filter is indicated by a spectral spectrum 15 in FIG. 9 and exhibits relatively high transmission characteristics for light in the wavelength region of 470 to 600 nm, but light in other wavelength regions (excluding wavelength regions exceeding 700 nm). Shows low transmission characteristics (however, the transmittance is not 0%), and the transmission is relatively suppressed.

従って、緑フィルタを通して印刷物Ａを観察すると、図８において蛍光発光スペクトル１３を示す第１インキ及び蛍光発光スペクトル１４を示す第２インキは、図１０（図８に対して図１０の発光強度のスケールは異なる。）において蛍光発光スペクトル１７及び蛍光発光スペクトル１８を示す。   Therefore, when the printed matter A is observed through the green filter, the first ink showing the fluorescence emission spectrum 13 and the second ink showing the fluorescence emission spectrum 14 in FIG. 8 are shown in FIG. 10 (the emission intensity scale of FIG. Are different from each other). Fluorescence emission spectrum 17 and fluorescence emission spectrum 18 are shown.

第２インキについて、フィルタを通す前の蛍光発光スペクトル１４（図８参照）とフィルタを通した蛍光発光スペクトル１８（図１０参照）を較べると、それぞれ左右にピークＰ１、Ｐ２（図８参照）とＰ１’、Ｐ２’（図１０参照）が示されているが、左右のピークのバランスが変化し、蛍光発光スペクトル１４に対して蛍光発光スペクトル１８では右ピークＰ２’に対して左ピークＰ１’が相対的に上がったようになるため、第２印刷領域２ａは緑味が増して、黄緑色に見るとこととなる。なお、第１インキについては、蛍光発光スペクトル１７では橙に緑味が加わる。このようにして、第１印刷領域１ａと第２印刷領域２ａは、互いに異なる色を呈して見えるから、領域を区別して確認できるようになる。   Comparing the fluorescence emission spectrum 14 before passing through the filter (see FIG. 8) and the fluorescence emission spectrum 18 passing through the filter (see FIG. 10) with respect to the second ink, peaks P1 and P2 (see FIG. 8) on the left and right, respectively. P1 ′ and P2 ′ (see FIG. 10) are shown, but the balance between the left and right peaks changes, and the fluorescence emission spectrum 18 has a left peak P1 ′ with respect to the right peak P2 ′. Since it seems to have risen relatively, the second printing area 2a has a greenishness and is seen as yellowish green. In addition, about the 1st ink, in the fluorescence emission spectrum 17, green is added to orange. In this way, the first print area 1a and the second print area 2a appear to have different colors, so that the areas can be distinguished and confirmed.

以上の実施例で具体的に把握されるように、本発明の本質は、２種類以上のインキについて、蛍光発光スペクトルが異なっていても（図８のスペクトル１３、１４を参照）目は同じ刺激を受ける（同色に見える）ように、少なくとも１種類のインキ（実施例では第２インキ）が２種以上の蛍光顔料の加法混色を用いて調整されており、フィルタを通して見ることで、前記蛍光発光スペクトルは異なる蛍光発光スペクトルの光として観察され（図１０のスペクトル１７、１８を参照）、目で同じ刺激が受けられなくなり、上記２種類以上のインキが互いに違った色として認識されるという原理を利用した構成にある。   As specifically understood from the above embodiments, the essence of the present invention is that the same stimulus is used for two or more types of inks even if the fluorescence emission spectra are different (see spectra 13 and 14 in FIG. 8). At least one kind of ink (second ink in the embodiment) is adjusted using an additive color mixture of two or more kinds of fluorescent pigments so that the fluorescent light emission is seen through a filter. The spectrum is observed as light of different fluorescence emission spectra (see spectra 17 and 18 in FIG. 10), and the same stimulus is not received by the eyes, and the principle that the above two or more types of inks are recognized as different colors. It is in the configuration used.

このように、本発明の特徴は、異なる複数の領域のうちの少なくとも１つの領域を蛍光顔料を２種以上有するインキで印刷し、この領域のインキが、他の領域を印刷したインキに対して、自然光下では無色又は同色を呈し、紫外線照射下では同色を呈して見え、紫外線照射下でかつ特定波長を遮蔽するフィルタを通すと異色として観察できるものである。従って、このように観察できるものであれば、上記１つの領域に係るインキと他の領域のインキの組合せは何でもよく、本実施例における上記の発光色を有するインキに限定されるものではない。   Thus, the feature of the present invention is that at least one of a plurality of different areas is printed with an ink having two or more fluorescent pigments, and the ink in this area is different from the ink printed on the other areas. It is colorless or the same color under natural light, appears the same color under ultraviolet irradiation, and can be observed as a different color when passing through a filter that shields a specific wavelength under ultraviolet irradiation. Therefore, as long as it can be observed in this way, the combination of the ink in the one region and the ink in the other region is not limited, and is not limited to the ink having the above-described emission color in this embodiment.

ところで、本実施例では、２つの領域のうち、１つの領域を蛍光顔料を１種有するインキで印刷し、他の領域を蛍光顔料を２種以上有するインキで印刷した印刷物を例示したが、このような構成でなくても、異なる複数の領域のうちの少なくとも１つの領域を蛍光顔料を２種以上有するインキで印刷したものであれば、異なる複数の領域のうち２以上の領域においてそれぞれ蛍光顔料を２種以上有するインキで印刷した印刷物でもよい。   By the way, in this embodiment, one of the two areas is printed with an ink having one kind of fluorescent pigment, and the other area is printed with an ink having two or more kinds of fluorescent pigment. Even if it is not such a configuration, as long as at least one of the plurality of different regions is printed with an ink having two or more types of fluorescent pigments, the fluorescent pigment in each of the two or more different regions It may be a printed matter printed with an ink having two or more.

本発明は、それぞれ特徴的なピークを示す蛍光発光スペクトルを有する２種のインキを用いて、偽造の極めて困難なバーコード印刷物を得ることができる。即ち、それぞれが特徴的なピークを示す蛍光発光スペクトルを有する第１インキと第２インキで印刷した画線を混在させてバーコードを作製する。   According to the present invention, it is possible to obtain a bar code printed material that is extremely difficult to counterfeit by using two types of inks each having a fluorescence emission spectrum exhibiting a characteristic peak. That is, a bar code is produced by mixing image lines printed with the first ink and the second ink each having a fluorescence emission spectrum showing a characteristic peak.

このバーコードは、自然光下及び単に蛍光発光させた状態では単種のバーコードパターンであるが、複数のバンドパスフィルタなどを使用し検知を行うことで、フィルタごとに検出されるバーコードパターンが異なり、複雑な機械読取が可能な印刷物になる。   This bar code is a single type of bar code pattern under natural light and simply in a fluorescent state. However, the bar code pattern detected for each filter can be detected by using a plurality of band pass filters. In contrast, it is a printed matter that is capable of complex machine reading.

以上、本発明に係る印刷物の実施形態を実施例に基づいて説明したが、本発明は、特にこのような実施例に限定されることない。それぞれの印刷領域は、隣接していても、離れていても、一部重なりあっていてもよいし、また、励起発光エネルギーは、紫外線に限定されることなく、赤外線、電子線を用い、それらのエネルギーによって発光する材料を用いたインキを使用してもよく、特許請求の範囲記載の技術的事項の範囲内でいろいろな実施例があることはいうまでもない。   As mentioned above, although embodiment of the printed matter based on this invention was described based on the Example, this invention is not specifically limited to such an Example. Each printed area may be adjacent, separated, or partially overlapped. Excitation light emission energy is not limited to ultraviolet rays, and infrared rays and electron beams are used. Of course, an ink using a material that emits light by the energy of the above may be used, and there are various embodiments within the scope of the technical matters described in the claims.

本発明は以上の構成であるから、紙幣、証書、身分証明書、パスポート、カード、バーコード、その他の秘匿情報の付与された印刷物に適用できる。   Since the present invention has the above-described configuration, it can be applied to a printed matter to which banknotes, certificates, identification cards, passports, cards, barcodes, and other confidential information are given.

本発明の印刷物の印刷領域を示した図である。It is the figure which showed the printing area | region of the printed matter of this invention. 本発明の印刷物を自然光下で観察した状態の図である。It is a figure of the state which observed the printed matter of this invention under natural light. 本発明の印刷物に紫外線を照射し観察した状態の図である。It is a figure of the state which irradiated and irradiated the ultraviolet-ray to the printed matter of this invention. 本発明の印刷物に紫外線を照射し、さらにフィルタを介して観察した状態の図である。It is a figure of the state which irradiated the ultraviolet-ray to the printed matter of this invention, and also observed through the filter. 蛍光顔料１の蛍光発光スペクトルを示した図である。It is the figure which showed the fluorescence emission spectrum of the fluorescent pigment 1. FIG. 蛍光顔料２の蛍光発光スペクトルを示した図である。It is the figure which showed the fluorescence emission spectrum of the fluorescent pigment 2. 蛍光顔料３の蛍光発光スペクトルを示した図である。It is the figure which showed the fluorescence emission spectrum of the fluorescent pigment 3. 第１インキ及び第２インキの蛍光発光スペクトルを示した図である。It is the figure which showed the fluorescence emission spectrum of 1st ink and 2nd ink. 緑フィルタ及び青フィルタの分光スペクトルを示した図である。It is the figure which showed the spectral spectrum of the green filter and the blue filter. 蛍光発光している第１インキ及び第２インキをフィルタを介して観察した時の蛍光発光スペクトルを示した図である。It is the figure which showed the fluorescence emission spectrum when the 1st ink and 2nd ink which are emitting fluorescence are observed through a filter.

符号の説明Explanation of symbols

１ 第１印刷領域
１’ 自然光下の第１印刷領域
１ａ 紫外線照射時の第１印刷領域
２ 第２印刷領域
２’ 自然光下の第２印刷領域
２ａ 紫外線照射時の第２印刷領域
３ 自然光光源
４ 視点（目）
５ 基材
６ 紫外線光源
７ 紫外線照射時に発光する領域
９ フィルタ
１０ 蛍光顔料１の蛍光発光スペクトル
１１ 蛍光顔料２の蛍光発光スペクトル
１２ 蛍光顔料３の蛍光発光スペクトル
１３ 第１インキの蛍光発光スペクトル
１４ 第２インキの蛍光発光スペクトル
１５ 緑フィルタの分光スペクトル
１６ 青フィルタの分光スペクトル
１７ 緑フィルタを介した第１インキの蛍光発光スペクトル
１８ 緑フィルタを介した第２インキの蛍光発光スペクトル
Ａ 実施例の印刷物
1 First printing area
1 'first print area under natural light
1a First printing area when irradiated with ultraviolet rays
2 Second printing area
2 'Second print area under natural light
2a Second printing area during UV irradiation
3 Natural light source
4 viewpoints (eyes)
5 Base material
6 UV light source
7 Area that emits light when irradiated with ultraviolet rays
9 Filter
10 Fluorescence emission spectrum of fluorescent pigment 1
11 Fluorescence emission spectrum of fluorescent pigment 2
12 Fluorescence emission spectrum of fluorescent pigment 3
13 Fluorescence emission spectrum of the first ink
14 Fluorescence emission spectrum of the second ink
15 Spectral spectrum of green filter
16 Spectral spectrum of blue filter
17 Fluorescence emission spectrum of the first ink through the green filter 18 Fluorescence emission spectrum of the second ink through the green filter A Printed Example

Claims (6)

２以上の印刷領域を有し、前記２以上の印刷領域の少なくとも２つの印刷領域は、それぞれ異なる蛍光発光インキによって印刷された印刷物であって、
前記蛍光発光インキのうちの少なくとも２種は、自然光下では目視で無色又は互いに同色を呈し、励起発光させるエネルギーの照射下における蛍光発光スペクトルが異なるが目視で互いに同色を呈するインキであることを特徴とする印刷物。 Two or more print areas, and at least two print areas of the two or more print areas are printed matter respectively printed with different fluorescent light-emitting inks,
At least two of the fluorescent light emitting inks are inks that are visually colorless or have the same color under natural light, and have different fluorescence emission spectra under the irradiation of energy for exciting light emission but have the same color visually. Printed material. 前記蛍光発光インキの少なくとも１種は、少なくとも２以上のピークを示す蛍光発光スペクトルを有するインキであることを特徴とする請求項１に記載の印刷物。   The printed matter according to claim 1, wherein at least one of the fluorescent light-emitting inks is an ink having a fluorescent light emission spectrum exhibiting at least two or more peaks. 前記蛍光発光インキの少なくとも１種は、可視波長域において少なくとも２以上のピークを示す蛍光発光スペクトルを有するインキであることを特徴とする請求項２に記載の印刷物。   The printed matter according to claim 2, wherein at least one of the fluorescent light-emitting inks is an ink having a fluorescent light emission spectrum showing at least two or more peaks in a visible wavelength region. 前記蛍光発光インキの少なくとも１種は、２種以上の蛍光顔料を含有するインキであることを特徴とする請求項１乃至３に記載の印刷物。   The printed matter according to any one of claims 1 to 3, wherein at least one of the fluorescent light-emitting inks is an ink containing two or more fluorescent pigments. 前記２種以上の蛍光顔料は、それぞれ異なる波長域にピークを示す蛍光発光スペクトルを有する顔料であることを特徴とする請求項４に記載の印刷物。   The printed matter according to claim 4, wherein the two or more types of fluorescent pigments are pigments having fluorescent emission spectra each having a peak in different wavelength ranges. 前記２種以上の蛍光顔料は、それぞれ可視波長域において異なる波長域にピークを示す蛍光発光スペクトルを有する顔料であることを特徴とする請求項５に記載の印刷物。   6. The printed material according to claim 5, wherein the two or more fluorescent pigments are pigments each having a fluorescence emission spectrum having a peak in a different wavelength range in a visible wavelength range.
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