JP2009078431A - Forgery prevention medium and verification method in use thereof - Google Patents

Forgery prevention medium and verification method in use thereof Download PDF

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JP2009078431A
JP2009078431A JP2007248860A JP2007248860A JP2009078431A JP 2009078431 A JP2009078431 A JP 2009078431A JP 2007248860 A JP2007248860 A JP 2007248860A JP 2007248860 A JP2007248860 A JP 2007248860A JP 2009078431 A JP2009078431 A JP 2009078431A
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ultraviolet
light
fluorescent
visible
region
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Yoshio Araki
美穂 荒木
Satoshi Gocho
智 牛腸
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Toppan Inc
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Toppan Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a forgery prevention medium having thereon a fluorescence emission layer which is hard to detect at optical wavelengths but becomes visible by emitting fluorescence in the optical region under the ultraviolet exposure, the fluorescence emission layer characteristically including a fluorescent material which emits the fluorescence in the optical region under the ultraviolet exposure and an ultraviolet absorbing material which absorbs one wavelength region of the ultraviolet which excites the fluorescent material, and to provide a verification method in use thereof. <P>SOLUTION: The forgery prevention medium includes the fluorescent material which is excited at a wide range of wavelength in the ultraviolet region and emits light in the optical region, a fluorescence emission layer for becoming visible due to the light emitted by the fluorescent material being mounted on the base material thereof in a condition where it is hard to detect under the irradiation of the visible light. The ultraviolet absorbing layer is laminated on the fluorescence emission layer including the ultraviolet absorbing material for absorbing a part of the ultraviolet which excites the fluorescent material included therein. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、可視光下では視認しにくいが、紫外線照射下では可視領域の蛍光を発光して視認可能となる蛍光発光層が設けられている偽造防止対策媒体およびそれを用いた検証方法に係わり、特に、その蛍光発光層は、紫外線照射により可視領域の蛍光を発光する蛍光体とこの蛍光体を励起させる紫外線の一波長領域を吸収する紫外線吸収材を含んでいることを特徴とする偽造防止対策媒体とそれを用いた検証方法に関する。   The present invention relates to an anti-counterfeit medium and a verification method using the same, which are provided with a fluorescent light-emitting layer that is difficult to visually recognize under visible light but is visible under ultraviolet irradiation. In particular, the fluorescent light emitting layer includes a phosphor that emits fluorescence in the visible region when irradiated with ultraviolet light, and an anti-counterfeiting material that includes an ultraviolet absorber that absorbs one wavelength region of ultraviolet light that excites the phosphor. The present invention relates to a countermeasure medium and a verification method using the medium.

有価証券、入場券、通行券等の印刷物や、運転免許証、パスポート、保険証等の個人を認証する証明証書等は、第三者に偽造や改竄がされないようにするために常に新たな偽造防止対策を盛り込むことが要求されており、併せて真偽の判定が容易かつ確実に行えるものであることが要求されている。   The printed matter such as securities, admission tickets, passports, and certificates that authenticate individuals such as driver's licenses, passports, insurance cards, etc. are always forged to prevent them from being counterfeited or falsified by third parties. It is required to incorporate preventive measures, and at the same time, it is required that authenticity can be easily and reliably determined.

上記のような要求に対応し、セキュリティ性をより高めるために、マイクロ文字、コピー牽制パターン、赤外線吸収インキあるいは蛍光発光インキ等が従来から広く用いられている。これらの中で、蛍光発光インキとは、可視光照射下では肉眼で視認し難く、紫外線や赤外線を照射することにより、肉眼あるいはカメラによってその存在が認識できるインキであり、赤、緑、青等の各色に発光する蛍光体が含有されている。   In order to meet the above requirements and further improve security, micro characters, copy check patterns, infrared absorbing inks, fluorescent light emitting inks, and the like have been widely used. Among these, fluorescent light-emitting inks are inks that are difficult to see with the naked eye under visible light irradiation, and whose presence can be recognized by the naked eye or a camera by irradiating ultraviolet rays or infrared rays. Red, green, blue, etc. The phosphors that emit light in the respective colors are contained.

このような蛍光発光インキに含有されている蛍光体としては、紫外線や赤外線の照射により蛍光を発光する無機蛍光体と有機蛍光体に大別することができる。また、可視光をほとんどあるいは全く吸収しない無色の蛍光体と、可視光領域にある程度の吸収域を持つ有色の蛍光体とに大別できる。   The phosphors contained in such fluorescent light-emitting inks can be broadly classified into inorganic phosphors and organic phosphors that emit fluorescence when irradiated with ultraviolet rays or infrared rays. Further, it can be roughly classified into a colorless phosphor that absorbs little or no visible light and a colored phosphor that has a certain absorption region in the visible light region.

このような蛍光体を用いた偽造防止対策としては、例えば、基材上の一部に蛍光体を含有する蛍光画像部を、可視光下では目視不可能な状態で設けておく手段が挙げられる。このような蛍光画像形成物に対して、蛍光体を励起させる紫外線を照射することにより、蛍光画像部を発光させ、所定の蛍光画像を識別することにより、真偽の判定を行うことができる。   As a measure against counterfeiting using such a phosphor, for example, there is a means for providing a fluorescent image part containing a phosphor in a part on a base material in a state invisible under visible light. . By irradiating such a fluorescent image formed product with ultraviolet light that excites the phosphor, the fluorescent image portion is caused to emit light, and a predetermined fluorescent image can be identified, thereby making it possible to determine authenticity.

しかし近年においては、蛍光発光インキが比較的容易に入手できるようになり、またブラックライト等の紫外線を照射する機器も簡単に入手できることから、それらを使用して偽造が行われ易い状況になってきている。そこで、このような状況に対抗して、例えば、２種類の蛍光体を混合してなる蛍光発光インキにより蛍光画像部を形成するようにし、その部分における発光色のみならず、発光部位も変化させるようにして偽造防止の効果をより高めるようにした提案がなされている。そのような例として、基材上に蛍光発光を吸収する可視光吸収層を印刷し、さらにその上に２波長でそれぞれ異なった蛍光を発光するインキで蛍光画像層を印刷してあって、その蛍光画像部に波長の異なる励起光を照射して２色に変化させた上で、可視光吸収層によって発光を吸収させ、発光色ならびに発光部位を変化させ得るようにして真偽の判別ができるようにした蛍光画像形成物が挙げられる（特許文献１参照）。   However, in recent years, fluorescent light-emitting inks have become relatively easy to obtain, and devices that irradiate ultraviolet rays, such as black light, can also be easily obtained. ing. Therefore, in order to cope with such a situation, for example, a fluorescent image portion is formed with a fluorescent light-emitting ink obtained by mixing two kinds of phosphors, and not only the light emission color but also the light-emitting portion is changed. Thus, a proposal has been made to further enhance the effect of preventing forgery. As such an example, a visible light absorbing layer that absorbs fluorescence emission is printed on a substrate, and further a fluorescent image layer is printed thereon with inks that emit different fluorescence at two wavelengths, The fluorescence image part is irradiated with excitation light having different wavelengths and changed to two colors, and then the visible light absorbing layer absorbs the light emission, so that the light emission color and the light emission site can be changed, and the authenticity can be determined. An example of the fluorescent image formed product is described (see Patent Document 1).

２種類の蛍光体を混合して組み合わせて使用しているこのような蛍光画像形成物中の蛍光体は、２５４ｎｍ付近の比較的短い波長の紫外線で励起される蛍光体と、３６５ｎｍ付近と２５４ｎｍ付近に波長成分をもつ紫外線で励起される蛍光体が組み合わされて用いられている。したがって、２５４ｎｍ付近に波長成分を有する紫外線を照射した時には、含有する蛍光体は必ず発光し、その時の発光色は用いられているそれぞれの蛍光体の発光色
が混色して呈する色相となり、彩度のある色が発光されなかったり、所望の発光色に設定することには制約があったり、さらには混色によって呈する色相の共通認識がないと真偽の判別がしにくい、等々の問題を抱えていた。
特開平１０−２５０２１４号公報 Phosphors in such a fluorescent image formed by using a mixture of two types of phosphors are phosphors excited by ultraviolet rays having a relatively short wavelength around 254 nm, and around 365 nm and around 254 nm. In addition, phosphors excited by ultraviolet rays having wavelength components are used in combination. Therefore, when an ultraviolet ray having a wavelength component in the vicinity of 254 nm is irradiated, the contained phosphor always emits light, and the emission color at that time becomes a hue which is a mixture of the emission colors of the phosphors used, and the saturation Certain colors are not emitted, there are restrictions on setting the desired emission color, and it is difficult to determine authenticity if there is no common recognition of hues due to color mixing, etc. It was.
Japanese Patent Laid-Open No. 10-250214

本発明は、以上のような問題点に着目してなされたもので、基材上に、紫外線領域の広範囲の波長で励起し、可視領域で発光する蛍光体を含有し、この蛍光体が発光することにより視認可能となる蛍光発光層を可視光の下では視認しにくい状態で設けると共に、この蛍光発光層の上には、そこに含まれている蛍光体を励起させる紫外線の一部を吸収する紫外線吸収材を含有する紫外線吸収層を積層させることにより、長波長側と短波長側に波長成分を有する紫外線を照射した時には可視領域の蛍光が発光して蛍光発光層の識別が可能となり、しかも長波長側または短波長側のいずれかに波長成分を有する紫外線を照射した時には一方の紫外線の照射では蛍光発光層の識別が不可能となるようにした、発光の有無を２値化して判別することができる偽造防止対策媒体およびそれを用いた検証方法を提供することを目的とする。   The present invention has been made paying attention to the above-described problems, and includes a phosphor that is excited on a wide range of wavelengths in the ultraviolet region and emits light in the visible region, and this phosphor emits light. The fluorescent light-emitting layer that can be visually recognized is provided in a state that is difficult to visually recognize under visible light, and a part of the ultraviolet light that excites the phosphor contained therein is absorbed on the fluorescent light-emitting layer. By laminating the ultraviolet absorbing layer containing the ultraviolet absorbing material, the visible light fluorescence is emitted when the ultraviolet light having the wavelength component on the long wavelength side and the short wavelength side is irradiated, and the fluorescent light emitting layer can be identified, In addition, when ultraviolet light having a wavelength component is irradiated on either the long wavelength side or the short wavelength side, it becomes impossible to distinguish the fluorescent light emitting layer by irradiation with one of the ultraviolet rays. To be able to And to provide a verification method using the forgery prevention medium and it that.

以上の課題を解決すべくなされ、請求項１に記載の発明は、基材上に、紫外線領域の広範囲の波長で励起し、可視領域で発光する蛍光体を含有し、この蛍光体が発光することにより視認可能となる蛍光発光層が可視光の照射下では視認しにくい状態で設けられていると共に、この蛍光発光層の上には、そこに含まれている蛍光体を励起させる紫外線の一部を吸収する紫外線吸収材を含有する紫外線吸収層が積層されていることを特徴とする偽造防止対策媒体である。   In order to solve the above problems, the invention according to claim 1 includes a phosphor that is excited on a substrate in a wide range of wavelengths in the ultraviolet region and emits light in the visible region, and the phosphor emits light. The fluorescent light-emitting layer that can be visually recognized is provided in a state that is difficult to visually recognize under irradiation with visible light. On the fluorescent light-emitting layer, one of ultraviolet rays that excites the phosphor contained therein is provided. An anti-counterfeit medium characterized in that an ultraviolet absorbing layer containing an ultraviolet absorbing material that absorbs a portion is laminated.

また、請求項２に記載の発明は、請求項１に記載の偽造防止対策媒体において、前記紫外線吸収材の最大吸収波長域が２５０ｎｍ〜３３０ｎｍであることを特徴とする。   The invention according to claim 2 is the anti-counterfeit medium according to claim 1, wherein the ultraviolet absorber has a maximum absorption wavelength range of 250 nm to 330 nm.

さらにまた、請求項３に記載の発明は、被検証品に請求項１または２に記載の偽造防止対策媒体を取り付け、この偽造防止対策媒体の部分に長波長側と短波長側に波長成分を有する紫外線を照射した時には可視領域の蛍光が発光して蛍光発光層の識別が可能となり、しかも長波長側または短波長側のいずれかに波長成分を有する紫外線を照射した時には一方の紫外線の照射では蛍光発光層の識別が不可能であることを判別して検証を行うことを特徴とする検証方法である。   Furthermore, the invention according to claim 3 attaches the anti-counterfeit medium according to claim 1 or 2 to the product to be verified, and the wavelength component is added to the long wavelength side and the short wavelength side of the anti-counterfeit medium. Fluorescence in the visible region is emitted when irradiated with ultraviolet light, and the fluorescent light emitting layer can be identified, and when irradiated with ultraviolet light having a wavelength component on either the long wavelength side or the short wavelength side, It is a verification method characterized in that verification is performed by determining that identification of a fluorescent light emitting layer is impossible.

紫外線は、一般に紫外線領域の長波長側からＵＶ−Ａ、ＵＶ−Ｂ、ＵＶ−Ｃに分けられ、ＵＶ−Ａは４００ｎｍ〜３２０ｎｍに波長成分を有し、ＵＶ−Ｂは３２０ｎｍ〜２９０ｎｍに波長成分を有す、ＵＶ−Ｃは２９０ｎｍ〜１０ｎｍに波長成分を有する紫外線である。本明細書においては、長波長側に波長成分を有する紫外線は紫外線長波ＵＶ−Ａを、短波長側に波長成分を有する紫外線は紫外線短波ＵＶ−Ｃをそれぞれ意味している。   Ultraviolet rays are generally divided into UV-A, UV-B, and UV-C from the long wavelength side of the ultraviolet region, UV-A has a wavelength component from 400 nm to 320 nm, and UV-B has a wavelength component from 320 nm to 290 nm. UV-C is an ultraviolet ray having a wavelength component at 290 nm to 10 nm. In the present specification, ultraviolet light having a wavelength component on the long wavelength side means ultraviolet long wave UV-A, and ultraviolet light having a wavelength component on the short wavelength side means ultraviolet short wave UV-C.

本発明は以上のような構成であるから、下記に示す如き効果がある。   Since the present invention is configured as described above, the following effects can be obtained.

本発明においては、長波長側と短波長側に波長成分を有する紫外線を照射した時には可視領域の蛍光が発光して蛍光発光層の識別が可能となり、しかも長波長側または短波長側のいずれかに波長成分を有する紫外線を照射した時には一方の紫外線の照射では蛍光発光層の識別が不可能であり、蛍光発光部の識別がその中の蛍光体の彩度の高い発色によって
明確に目視可能となり、目視観察による真偽の検証が容易かつ確実に行えるようになる。 In the present invention, when ultraviolet light having a wavelength component on the long wavelength side and the short wavelength side is irradiated, fluorescence in the visible region is emitted, and the fluorescent light emitting layer can be identified, and either the long wavelength side or the short wavelength side can be identified. When ultraviolet light having a wavelength component is irradiated, it is impossible to identify the fluorescent light-emitting layer by irradiation of one ultraviolet light, and the fluorescent light-emitting part can be clearly identified by the highly saturated color development of the phosphor therein. Authenticity verification by visual observation can be performed easily and reliably.

また、この偽造防止対策媒体を用いて、長波長側に波長成分を有する紫外線と短波長側に波長成分を有する紫外線の両方を照射することにより、発光の有無を２値化して判別することが可能となり、真偽の検証がより容易になる。そして、蛍光発光層の存在に第三者が気付き、一般の蛍光インキを用いて蛍光発光層を基材上に設け、偽造品を不正に作製したとしても、偽造の対象物の構成がこのような構成であることに気付かないため、一般的な蛍光発光印刷物として作製されてしまい、外見上は同じものであるかの如くに見えても、偽造品においては発光の有無を２値化して判別することが不可能なものとなってしまい、直ちに偽造品であることが検証されることが期待される。   In addition, by using this anti-counterfeit medium, by irradiating both ultraviolet rays having a wavelength component on the long wavelength side and ultraviolet rays having a wavelength component on the short wavelength side, the presence or absence of light emission can be binarized and determined. It becomes possible and verification of authenticity becomes easier. Even if a third party notices the presence of the fluorescent light-emitting layer, the fluorescent light-emitting layer is provided on the base material using general fluorescent ink, and a counterfeit product is illegally produced, the structure of the counterfeit object is like this Because it is not noticed that it is a simple structure, it is produced as a general fluorescent light-emitting printed matter, and even if it looks as if it is the same in appearance, in the counterfeit product, the presence or absence of light emission is binarized and discriminated It is expected to be immediately verified that it is a counterfeit product.

以下、図面を用いて本発明の実施の形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本発明の偽造防止対策媒体の一例の平面状態を示す説明図であり、図２は、図１の偽造防止対策媒体のＸ−Ｘ線による断面部分における概略の構成を示す説明図である。また、図３は、図１に示す偽造防止対策媒体に長波長側に波長成分を有する紫外線を照射した時に観察される偽造防止対策媒体の状態を示す説明図であり、図４は、図１に示す偽造防止対策媒体に短波長側に波長成分を有する紫外線を照射した時に観察される偽造防止対策媒体の状態を示す説明図である。   FIG. 1 is an explanatory view showing a planar state of an example of the anti-counterfeit medium according to the present invention, and FIG. 2 is an explanatory view showing a schematic configuration of a cross-sectional portion of the anti-counterfeit medium of FIG. It is. FIG. 3 is an explanatory diagram showing a state of the anti-counterfeit medium observed when the anti-counterfeit medium shown in FIG. 1 is irradiated with ultraviolet light having a wavelength component on the long wavelength side, and FIG. It is explanatory drawing which shows the state of the forgery prevention countermeasure medium observed when the ultraviolet rays which have a wavelength component on the short wavelength side are irradiated to the forgery prevention countermeasure medium shown in FIG.

以下に本発明の偽造防止対策媒体について具体的に説明する。   The anti-counterfeit medium of the present invention will be specifically described below.

本発明の偽造防止対策媒体１は、図１並びに図２に示すように、基材１１上に、紫外線領域の広範囲の波長で励起し、可視領域で発光する蛍光体を含有し、この蛍光体が発光することにより視認可能となる蛍光発光層２１が可視光の照射下では視認しにくい状態で設けられていると共に、この蛍光発光層２１の上には、そこに含まれている蛍光体を励起させる紫外線の一部を吸収する紫外線吸収材を含有する紫外線吸収層２２が積層されている。２３は一般の印刷で使用される非蛍光性の印刷インキで形成されている絵柄印刷層である。   As shown in FIG. 1 and FIG. 2, the anti-counterfeit medium 1 of the present invention contains, on a substrate 11, a phosphor that is excited at a wide wavelength in the ultraviolet region and emits light in the visible region. The fluorescent light-emitting layer 21 that can be visually recognized by emitting light is provided in a state that is difficult to visually recognize under irradiation of visible light, and the phosphor contained therein is provided on the fluorescent light-emitting layer 21. An ultraviolet absorption layer 22 containing an ultraviolet absorber that absorbs part of the excited ultraviolet rays is laminated. Reference numeral 23 denotes a pattern printing layer formed of non-fluorescent printing ink used in general printing.

このような構成の偽造防止対策媒体１の基材１１としては、例えば、アート紙、コート紙、あるいは上質紙等の用紙や、コートボール、コートマニラ等の板紙、あるいは特殊証券用紙等が挙げられる。また、白色ＰＥＴや白色塩ビ等からなるシートも使用でき、これらの中から適宜のものを用途等に応じて選択して用いればよい。これらの用紙やシート等からなる基材には、蛍光増白剤が多く含まれていないことが望ましい。   Examples of the base material 11 of the anti-counterfeit countermeasure medium 1 having such a configuration include paper such as art paper, coated paper, and high-quality paper, paperboard such as coated ball and coat manila, or special securities paper. . Also, a sheet made of white PET, white polyvinyl chloride, or the like can be used, and an appropriate one may be selected and used according to the application. It is desirable that the substrate made of such paper or sheet does not contain much fluorescent brightening agent.

蛍光発光層２１の構成部材としては、紫外線領域の広範囲の波長で励起し、可視領域で発光する蛍光体とこの蛍光体を励起させる紫外線の一部を吸収する紫外線吸収材を含有してなる画像形成部材が用いられる。より具体的には、上記したような蛍光体と紫外線吸収材を少なくとも含有してなる蛍光インキが用いられる。   As a constituent member of the fluorescent light-emitting layer 21, an image containing a phosphor that is excited in a wide range of wavelengths in the ultraviolet region and emits light in the visible region and an ultraviolet absorber that absorbs part of the ultraviolet light that excites the phosphor. A forming member is used. More specifically, a fluorescent ink containing at least a phosphor and an ultraviolet absorber as described above is used.

蛍光体は、紫外線照射により蛍光を発光する物質であって、無機蛍光体と有機蛍光体に大別することができる。また、可視領域にある程度の吸収を持つ蛍光体と、可視光をほとんどあるいは全く吸収しない無色の蛍光体とに大別できる。さらに、蛍光体は、殺菌灯によく用いられている比較的波長の短い２５４ｎｍ付近の紫外線で励起される蛍光体と、一般なブラックライトから照射される比較的波長の長い３６５ｎｍ付近の紫外線と、前記した２５４ｎｍ付近の紫外線の両方の広い波長領域で励起する蛍光体の２種類に大別される。   The phosphor is a substance that emits fluorescence when irradiated with ultraviolet rays, and can be broadly classified into an inorganic phosphor and an organic phosphor. Moreover, it can be roughly classified into phosphors having a certain degree of absorption in the visible region and colorless phosphors that absorb little or no visible light. Furthermore, the phosphor is a phosphor that is excited by ultraviolet rays of a relatively short wavelength of about 254 nm, which are often used for germicidal lamps, and a relatively long wavelength of 365 nm of ultraviolet rays emitted from a general black light, There are two types of phosphors that are excited in a wide wavelength region of both ultraviolet rays near 254 nm.

本発明の偽造防止対策媒体においては、これらの蛍光体の中から適宜のものを選択し、長波長側に波長成分を有する紫外線を照射しても、短波長側に波長成分を有する紫外線を照射しても可視領域の蛍光を発光するようにする。   In the anti-counterfeit medium of the present invention, an appropriate one is selected from these phosphors, and even if ultraviolet light having a wavelength component on the long wavelength side is irradiated, ultraviolet light having a wavelength component on the short wavelength side is irradiated. Even so, fluorescence in the visible region is emitted.

より具体的には、Ｃａ2Ｂ5Ｏ9Ｃｌ：Ｅｕ2+、ＣａＷＯ4、ＺｎＯ：Ｚｎ、Ｚｎ2ＳｉＯ4：Ｍｎ、Ｙ2Ｏ2Ｓ：Ｅｕ、ＺｎＳ：Ａｇ、ＹＶＯ4：Ｅｕ、Ｙ2Ｏ3：Ｅｕ、Ｇｄ2Ｏ2Ｓ：Ｔｂ、Ｌａ2Ｏ2Ｓ：Ｔｂ、Ｙ3Ａｌ5Ｏ12：Ｃｅ等が挙げられる。これらを単体で、または、これらの数種を適宜に混合して使用すればよい。因みに、蛍光体は通常その組成によって表記し、主成分である母体結晶とその中に分散した付活剤に分け、（：）で繋いで表現する。例えば、ＺｎＳ：Ｍｎは、母体結晶がＺｎＳ、付活剤がＭｎであることを示している。 More specifically, Ca 2 B 5 O 9 Cl: Eu 2+ , CaWO 4 , ZnO: Zn, Zn 2 SiO 4 : Mn, Y 2 O 2 S: Eu, ZnS: Ag, YVO 4 : Eu, Y 2 O 3 : Eu, Gd 2 O 2 S: Tb, La 2 O 2 S: Tb, Y 3 Al 5 O 1 2 : Ce, and the like. These may be used alone or as a mixture of several of them. Incidentally, phosphors are usually expressed by their composition, and are divided into parent crystals, which are main components, and activators dispersed therein, and are connected by (:). For example, ZnS: Mn indicates that the base crystal is ZnS and the activator is Mn.

また、蛍光体のうちの長波長の蛍光を発する蛍光顔料としては、芳香族ヘテロ環誘導体等の蛍光染料の樹脂固溶体であり、その樹脂分として、ポリメタクリル酸エステル、尿素・ホルマリン樹脂、メラミン・ホルマリン樹脂、塩化ビニル、塩ビ・酢ビ共重合体、アルキッド樹脂や、それらを変性したものが挙げられる。   In addition, the fluorescent pigment that emits long-wavelength fluorescence among the phosphors is a resin solid solution of a fluorescent dye such as an aromatic heterocyclic derivative. The resin component includes polymethacrylate, urea / formalin resin, melamine, Formalin resin, vinyl chloride, vinyl chloride / vinyl acetate copolymer, alkyd resin, and those obtained by modifying them.

さらに蛍光体のうち、蛍光染料としては、例えば、芳香族ヘテロ環誘導体としてのフルオレセン、エオシン、ローダミンＢ 、ローダミン６ Ｇ 、チオフラビン等の色素、ジアミノスチルベンジスルホン酸、イミダゾール、クマリン、トリアゾール、カルバゾール、ピリジン、ナフタル酸、イミダゾロン等の誘導体、アントラセン等のベンゼン環を有する化合物等が挙げられる。   Further, among the fluorescent substances, examples of the fluorescent dye include fluorescein, eosin, rhodamine B, rhodamine 6G, thioflavine and other dyes as aromatic heterocyclic derivatives, diaminostilbene disulfonic acid, imidazole, coumarin, triazole, carbazole, pyridine. , Derivatives such as naphthalic acid and imidazolone, and compounds having a benzene ring such as anthracene.

一方、紫外線吸収層２２中の紫外線吸収材としては、酸化亜鉛、酸化チタン、酸化セリウム、酸化鉄等が代表例として挙げられる。特にベンゾトリアゾール系紫外線吸収材は長波長に波長成分を有する紫外線に顕著な吸収特性を有していることで知られる。また、ポリウレタン樹脂やポリウレア樹脂、ポリアミド樹脂、ポリスチレン樹脂、アクリル樹脂、スチレンアクリル共重合体、ゼラチン、ポリビニルアルコール等は短波長側に波長成分を有する紫外線を特に吸収する特性を持っていることで知られている。これらの中では、紫外線長波ＵＶ−Ａは吸収せずに、紫外線短波ＵＶ−Ｃをカットする紫外線吸収材が好適に用いられる。   On the other hand, examples of the ultraviolet absorbing material in the ultraviolet absorbing layer 22 include zinc oxide, titanium oxide, cerium oxide, and iron oxide. In particular, benzotriazole ultraviolet absorbers are known to have remarkable absorption characteristics for ultraviolet rays having a wavelength component at a long wavelength. In addition, polyurethane resin, polyurea resin, polyamide resin, polystyrene resin, acrylic resin, styrene acrylic copolymer, gelatin, polyvinyl alcohol, etc. are known to have a characteristic of absorbing ultraviolet rays having a wavelength component on the short wavelength side. It has been. In these, the ultraviolet absorber which cuts ultraviolet short wave UV-C, without absorbing ultraviolet long wave UV-A is used suitably.

上述した蛍光発光層や紫外線吸収層は、オフセット印刷、スクリーン印刷、グラビア印刷、フレキソ印刷、インクジェット印刷等、公知の印刷方式で形成することができる。   The fluorescent light emitting layer and the ultraviolet absorbing layer described above can be formed by a known printing method such as offset printing, screen printing, gravure printing, flexographic printing, and ink jet printing.

以下に、本発明を実施例により詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to examples.

蛍光増白剤を使用していない上質紙上に、下記組成の蛍光インキを用いてオフセット印刷法にて、約２μｍの膜厚で蛍光発光層を設けた。そしてこの蛍光発光層の上に重なるように下記組成の紫外線吸収インキを用いてオフセット印刷法にて、約２μｍの膜厚で紫外線吸収層を設けた。そして、この紫外線吸収層の部分を含む基材上に下記プロセスインキにて通常の絵柄印刷層を施し、実施例１に係る本発明の偽造防止対策媒体を得た。
［蛍光インキの組成]
蛍光顔料（ＵＶＩＴＥＸ ＯＢ ＣＩＢＡ−ＧＥＩＧＹ社製） １０重量部
ＦＤ Ｓメジウム ＴＰロ（東洋インキ製造社製） ９０重量部
[紫外線吸収インキの組成]
Ｕｖｉｎｕｌ３０３５（ＢＡＳＦ社製） １０重量部
ＦＤ Ｓメジウム ＴＰロ（東洋インキ製造社製） ９０重量部
［プロセスインキの種類］
ＦＤ ＯＬ 黄ＴＣロ（東洋インキ製造社製）
ＦＤ ＯＬ 紅ＴＣロ（東洋インキ製造社製）
ＦＤ ＯＬ 藍ＴＣロ（東洋インキ製造社製）。 A fluorescent light-emitting layer having a film thickness of about 2 μm was formed on a high-quality paper not using a fluorescent brightener by an offset printing method using a fluorescent ink having the following composition. Then, an ultraviolet absorbing layer having a film thickness of about 2 μm was provided by an offset printing method using an ultraviolet absorbing ink having the following composition so as to overlap the fluorescent light emitting layer. And the normal pattern printing layer was given with the following process ink on the base material containing the part of this ultraviolet absorption layer, and the forgery prevention medium of the present invention concerning Example 1 was obtained.
[Composition of fluorescent ink]
Fluorescent pigment (manufactured by UVITEX OB CIBA-GEIGY) 10 parts by weight FD S medium TP (manufactured by Toyo Ink Manufacturing Co., Ltd.) 90 parts by weight
[Composition of UV absorbing ink]
Uvinul 3035 (manufactured by BASF) 10 parts by weight FD S medium TP (manufactured by Toyo Ink Manufacturing Co., Ltd.) 90 parts by weight [type of process ink]
FD OL Yellow TC (Toyo Ink Manufacturing Co., Ltd.)
FD OL Red TC (Toyo Ink Manufacturing Co., Ltd.)
FD OL Indigo TC (manufactured by Toyo Ink Co., Ltd.).

以上のような方法で作製した偽造防止対策媒体は、可視光下ではプロセスインキからなる絵柄印刷層のみが視認でき、蛍光発光層は視認できなかった。しかし、３６５ｎｍ付近の波長成分を有する紫外線を照射すると蛍光発光層２１が図３に示すような状態で発光して目視可能となり、２５４ｎｍ付近の短波長成分を有する紫外線を照射すると蛍光発光層の部分は発光せず、図４に示すように視認ができなかった。すなわち、長波長側に波長成分を有する紫外線を照射した際と短波長側に波長成分を有する紫外線を照射した際の蛍光発光の有無を確認することによって、真正物か否かの検証が容易にかつ確実にできることが分かった。   In the anti-counterfeit medium produced by the method as described above, only the pattern printing layer made of process ink was visible under visible light, and the fluorescent light-emitting layer was not visible. However, when the ultraviolet light having a wavelength component near 365 nm is irradiated, the fluorescent light emitting layer 21 emits light in the state shown in FIG. 3 and is visible, and when the ultraviolet light having a short wavelength component near 254 nm is irradiated, a portion of the fluorescent light emitting layer is obtained. Did not emit light and was not visible as shown in FIG. In other words, it is easy to verify whether the product is genuine by confirming the presence or absence of fluorescence emission when ultraviolet light having a wavelength component on the long wavelength side and ultraviolet light having a wavelength component on the short wavelength side are irradiated. I found that I could do it reliably.

本発明の偽造防止対策媒体の一実施例の平面状態を示す説明図である。It is explanatory drawing which shows the planar state of one Example of the forgery prevention countermeasure medium of this invention. 図１の偽造防止媒体のＸ−Ｘ線による断面部分における概略の構成を示す説明図である。It is explanatory drawing which shows the schematic structure in the cross-sectional part by the XX line of the forgery prevention medium of FIG. 図１に平面状態を示す偽造防止対策媒体に長波長側に波長成分を有する紫外線を照射した時に目視される偽造防止対策媒体の状態を示す説明図である。It is explanatory drawing which shows the state of the forgery prevention countermeasure medium visually observed when the ultraviolet light which has a wavelength component on the long wavelength side is irradiated to the forgery prevention countermeasure medium which shows a planar state in FIG. 図１に平面状態を示す偽造防止対策媒体に短波長側に波長成分を有する紫外線を照射した時に目視される偽造防止対策媒体の状態を示す説明図である。It is explanatory drawing which shows the state of the forgery prevention countermeasure medium visually observed when the ultraviolet light which has a wavelength component on the short wavelength side is irradiated to the forgery prevention countermeasure medium which shows a planar state in FIG.

符号の説明Explanation of symbols

１ 偽造防止対策媒体
１１ 基材
２１ 蛍光発光層
２２ 紫外線吸収層
２３ 絵柄印刷層 DESCRIPTION OF SYMBOLS 1 Counterfeit prevention measure medium 11 Base material 21 Fluorescent light emitting layer 22 Ultraviolet absorption layer 23 Picture printing layer

Claims (3)

基材上に、紫外線領域の広範囲の波長で励起し、可視領域で発光する蛍光体を含有し、この蛍光体が発光することにより視認可能となる蛍光発光層が可視光の照射下では視認しにくい状態で設けられていると共に、この蛍光発光層の上には、そこに含まれている蛍光体を励起させる紫外線の一部を吸収する紫外線吸収材を含有する紫外線吸収層が積層されていることを特徴とする偽造防止対策媒体。   On the substrate, a phosphor that is excited with a wide range of wavelengths in the ultraviolet region and emits light in the visible region, and a fluorescent layer that becomes visible when the phosphor emits light is visible under irradiation of visible light. In addition to being provided in a difficult state, an ultraviolet absorbing layer containing an ultraviolet absorbing material that absorbs part of ultraviolet rays that excites the phosphor contained therein is laminated on the fluorescent light emitting layer. An anti-counterfeit medium characterized by that. 前記紫外線吸収材の最大吸収波長域が２５０ｎｍ〜３３０ｎｍであることを特徴とする請求項１に記載の偽造防止対策媒体。   The anti-counterfeit medium according to claim 1, wherein a maximum absorption wavelength region of the ultraviolet absorber is 250 nm to 330 nm. 被検証品に請求項１または２に記載の偽造防止対策媒体を取り付け、この偽造防止対策媒体の部分に長波長側と短波長側に波長成分を有する紫外線を照射した時には可視領域の蛍光が発光して蛍光発光層の識別が可能となり、しかも長波長側または短波長側のいずれかに波長成分を有する紫外線を照射した時には一方の紫外線の照射では蛍光発光層の識別が不可能であることを判別して検証を行うことを特徴とする検証方法。   The anti-counterfeit medium described in claim 1 or 2 is attached to the product to be verified, and when the anti-counterfeit medium is irradiated with ultraviolet rays having wavelength components on the long wavelength side and the short wavelength side, fluorescence in the visible region is emitted. The fluorescent light-emitting layer can be identified, and when the ultraviolet light having a wavelength component is irradiated on either the long wavelength side or the short wavelength side, it is impossible to identify the fluorescent light-emitting layer with one ultraviolet light irradiation. A verification method characterized by discriminating and performing verification.
JP2007248860A 2007-09-26 2007-09-26 Forgery prevention medium and verification method in use thereof Pending JP2009078431A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014000684A (en) * 2012-06-15 2014-01-09 Toppan Printing Co Ltd Information recording medium
JP2015009521A (en) * 2013-07-01 2015-01-19 独立行政法人 国立印刷局 Luminescence printed matter
WO2016080374A1 (en) * 2014-11-20 2016-05-26 大日本印刷株式会社 Light-emitting medium and method for reading light-emitting medium
JP2020185674A (en) * 2019-05-10 2020-11-19 凸版印刷株式会社 Forgery prevention medium and authenticity discrimination method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014000684A (en) * 2012-06-15 2014-01-09 Toppan Printing Co Ltd Information recording medium
JP2015009521A (en) * 2013-07-01 2015-01-19 独立行政法人 国立印刷局 Luminescence printed matter
WO2016080374A1 (en) * 2014-11-20 2016-05-26 大日本印刷株式会社 Light-emitting medium and method for reading light-emitting medium
JPWO2016080374A1 (en) * 2014-11-20 2017-08-31 大日本印刷株式会社 Luminescent medium and method for reading luminescent medium
JP2020185674A (en) * 2019-05-10 2020-11-19 凸版印刷株式会社 Forgery prevention medium and authenticity discrimination method
JP7268472B2 (en) 2019-05-10 2023-05-08 凸版印刷株式会社 Counterfeit prevention medium and authenticity determination method

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