JP5966255B2 - Authenticity identification medium and identification method of authenticity identification medium - Google Patents
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- 238000000034 method Methods 0.000 title claims description 31
- 230000005284 excitation Effects 0.000 claims description 69
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 38
- 238000005259 measurement Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 15
- 230000001678 irradiating effect Effects 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 11
- 238000002203 pretreatment Methods 0.000 claims 2
- 239000000976 ink Substances 0.000 description 23
- 238000007639 printing Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 12
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- HJOVHMDZYOCNQW-UHFFFAOYSA-N isophorone Chemical compound CC1=CC(=O)CC(C)(C)C1 HJOVHMDZYOCNQW-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000123 paper Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000012795 verification Methods 0.000 description 4
- 238000007645 offset printing Methods 0.000 description 3
- 238000007650 screen-printing Methods 0.000 description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 description 3
- 229910052772 Samarium Inorganic materials 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002070 germicidal effect Effects 0.000 description 2
- 238000007646 gravure printing Methods 0.000 description 2
- 238000007641 inkjet printing Methods 0.000 description 2
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- 238000007649 pad printing Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XHCSPSAEWNVJTB-UHFFFAOYSA-N P.P.[S-2].S.S.S.[Ca+2] Chemical compound P.P.[S-2].S.S.S.[Ca+2] XHCSPSAEWNVJTB-UHFFFAOYSA-N 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910003668 SrAl Inorganic materials 0.000 description 1
- 239000005084 Strontium aluminate Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 229920001887 crystalline plastic Polymers 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 description 1
- 238000002073 fluorescence micrograph Methods 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000007644 letterpress printing Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- FNWBQFMGIFLWII-UHFFFAOYSA-N strontium aluminate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Al+3].[Sr+2].[Sr+2] FNWBQFMGIFLWII-UHFFFAOYSA-N 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- ZEGFMFQPWDMMEP-UHFFFAOYSA-N strontium;sulfide Chemical compound [S-2].[Sr+2] ZEGFMFQPWDMMEP-UHFFFAOYSA-N 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
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- Inspection Of Paper Currency And Valuable Securities (AREA)
- Luminescent Compositions (AREA)
- Credit Cards Or The Like (AREA)
Description
本発明は、蛍光を発光することにより識別が可能となる識別媒体とその識別方法に係わり、特に、熱をかけている間またはその直後に励起光を照射することによる蛍光と、さらに一定時間、可視光を照射した後に励起光を照射することによる蛍光を測定することによって真正性を識別する真正性識別媒体とその識別方法に関する。 The present invention relates to an identification medium that can be identified by emitting fluorescence, and a method for identifying the same, in particular, fluorescence by irradiating excitation light during or immediately after applying heat, and a certain period of time, The present invention relates to an authenticity identifying medium for identifying authenticity by measuring fluorescence by irradiating excitation light after irradiating visible light, and an identifying method thereof.
有価証券、カードおよび通行券などの貴重印刷物や、運転免許証、パスポートおよび保険証など個人を認証する証明証書、物品を真正であると証明するステッカー等の偽造防止媒体は、第三者に偽造および改竄されないために常に新たな偽造防止技術を盛り込むことが要求されており、併せて真正品であるかどうかの判定が可能な真正性識別方法または真偽判定方法が必要とされている。 Anti-counterfeiting media such as valuable printed matter such as securities, cards, and pass tickets, certificates that authenticate individuals such as driver's licenses, passports and insurance cards, and stickers that certify articles as authentic In order to prevent tampering, new anti-counterfeiting techniques are always required, and an authenticity identification method or authenticity determination method capable of determining whether or not the product is genuine is required.
上記偽造防止技術には、セキュリティ性を高めるために、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などが用いられている。上記技術のうち、蛍光発光インキとは、通常の可視光下で肉眼により視認しがたく、紫外線や赤外線を照射することにより、目視あるいはカメラによって画像を検出することが可能となるインキ等がある。 In the anti-counterfeiting technology, micro characters, copy check patterns, infrared absorbing ink, fluorescent light emitting ink, or the like is used in order to enhance security. Among the above-mentioned techniques, fluorescent light-emitting inks are inks that are difficult to see with the naked eye under normal visible light, and that can detect an image visually or with a camera when irradiated with ultraviolet rays or infrared rays. .
上記の蛍光インキは、通常の印刷用のインキに用いられる可視光領域に吸収を持つ有色の有機顔料あるいは無機顔料の代わりに、蛍光性の顔料が用いられる。蛍光発光インキの他の成分としては、ビヒクルおよび補助剤などがある。上記の蛍光発光インキは、通常のオフセット印刷等の公知の印刷方式にて蛍光印刷部を形成でき、赤、緑、青などの各色に発光する蛍光体である。 In the above fluorescent ink, a fluorescent pigment is used instead of a colored organic pigment or an inorganic pigment having absorption in the visible light region used for a normal printing ink. Other components of the fluorescent ink include vehicles and adjuvants. The fluorescent light-emitting ink is a phosphor that can form a fluorescent printing portion by a known printing method such as normal offset printing and emits light in each color such as red, green, and blue.
蛍光印刷部を浮かび上がらせるためには、励起光となる紫外線を照射する。紫外線を照射することにより、蛍光印刷物の蛍光体が紫外線を吸収し、可視領域の蛍光を発光する。この蛍光を目視あるいはカメラなどを利用して蛍光画像を確認することができる。照射する紫外線の波長としては、使用する蛍光体の種類により種々の光源を選択することが可能である。特に、３６５ｎｍの波長の紫外線を発光するブラックライトは小型のものが広く使用されている。 In order to make the fluorescent printing part appear, ultraviolet rays serving as excitation light are irradiated. By irradiating with ultraviolet rays, the phosphor of the fluorescent printed matter absorbs the ultraviolet rays and emits fluorescence in the visible region. The fluorescence image can be confirmed visually or using a camera or the like. As the wavelength of the ultraviolet rays to be irradiated, various light sources can be selected depending on the type of phosphor used. In particular, a small black light that emits ultraviolet light having a wavelength of 365 nm is widely used.
しかしながら、近年においては、蛍光発光インキなども比較的容易に入手することが可能となってきている。そのため、２種類の蛍光材を混合して、発光色のみならず、発光部位を変化させる提案がなされている。一例として、基材上に蛍光発光を吸収する可視光吸収層を印刷し、その上に二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た印刷物であり、波長の異なった励起光を照射して二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る、真偽判定可能な蛍光画像形成物が特許文献１に開示されている。 However, in recent years, fluorescent light-emitting inks and the like can be obtained relatively easily. Therefore, proposals have been made to change not only the emission color but also the emission site by mixing two types of fluorescent materials. As an example, a visible light absorbing layer that absorbs fluorescence emission is printed on a substrate, and a fluorescent image layer is printed thereon with ink that emits different fluorescence at two wavelengths on the substrate. Patent Document 1 discloses a fluorescent image-formed product that can be determined as authenticity by irradiating excitation light and changing the color to two colors, and then absorbing the emitted light by the visible light absorbing layer to change the emission color and the emission site. Has been.
２種類の蛍光体を混合して組み合わせた例においては、異なった励起光を照射して短波の紫外線と長波の紫外線を照射した場合では、異なった蛍光を発光する。しかしながら、これらの蛍光体は、殺菌灯によく用いられる比較的短い２５４ｎｍ付近の波長の紫外線で励起される蛍光体と、一般にブラックライトと呼ばれる比較的波長の長い紫外線として良く用いられる３６５ｎｍ付近の紫外線および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、この２種類の組み合わせとなる。この場合、蛍光体を１種類使用しても２種類使用しても、短波の紫外線を照射した際には必ず発光し、
短波の紫外線の照射時には上記２種類の蛍光体の混合した色となり、原色ではなく、彩度のある色が発光しなかったり、色を選べなかったりする等の制約があるため、混色になった場合に色の共通認識がないと判定しにくい問題があり、さらには、殺菌灯は目に対して危険であるという問題点もあった。
In an example in which two kinds of phosphors are mixed and combined, when different excitation light is irradiated and short-wave ultraviolet light and long-wave ultraviolet light are irradiated, different fluorescence is emitted. However, these phosphors are phosphors that are excited by ultraviolet rays having a relatively short wavelength of about 254 nm that are often used in germicidal lamps, and ultraviolet rays that are often used as ultraviolet rays having a relatively long wavelength called black light. And two types of phosphors that are excited in a wide wavelength range of both ultraviolet rays near 254 nm and combinations of these two types. In this case, regardless of whether one or two phosphors are used, they always emit light when irradiated with short-wave ultraviolet light.
When irradiating with short-wave ultraviolet light, it becomes a mixed color of the above two types of phosphors, and it is a mixed color due to restrictions such as not being a primary color but emitting a chromatic color or being unable to choose a color. In some cases, there is a problem that it is difficult to determine if there is no common recognition of colors, and further, there is a problem that germicidal lamps are dangerous for eyes.
本発明は、前記した従来の問題点に鑑みてなされた発明であり、目に対して安全に、且つ容易に判定が可能であり、より真正性に関する不正が行われにくい識別媒体およびその識別方法を提供することを課題とする。 The present invention is an invention made in view of the above-described conventional problems, and an identification medium that can be safely and easily determined for the eyes and is less likely to be fraudulent with respect to authenticity, and an identification method therefor It is an issue to provide.
上記の課題を解決する手段として、本発明の請求項１に記載の発明は、少なくとも、蛍光体を含有し真正性を判定するために使用される識別層と、絵柄や情報を表示するための絵柄層と、前記識別層と前記絵柄層を形成するための基材と、からなる真正性識別媒体であって、
前記蛍光体は、常温より高い温度に保持するか、または保持終了の直後に可視領域または近赤外領域の励起光を照射した時の可視領域または近赤外領域の蛍光の発光強度よりも、常温にて可視光を照射した後に前記励起光を照射した時の蛍光の発光強度の方が高い蛍光体であり、
前記識別層に含有される前記蛍光体の蛍光の波長領域が赤外領域にあり、前記基材から見て前記絵柄層は前記識別層より外側に形成されていることを特徴とする真正性識別媒体。
As means for solving the above-mentioned problems, the invention according to claim 1 of the present invention includes at least an identification layer containing a phosphor and used for judging authenticity, and for displaying a pattern and information. An authenticity identification medium comprising a pattern layer, and the identification layer and a substrate for forming the pattern layer,
The phosphor is held at a temperature higher than normal temperature, or more than the emission intensity of fluorescence in the visible region or near infrared region when irradiated with excitation light in the visible region or near infrared region immediately after the end of holding, high phosphor der towards the emission intensity of fluorescence when irradiated with the excitation light after the irradiation with the visible light at room temperature is,
Authenticity identification characterized in that the fluorescent wavelength region of the phosphor contained in the identification layer is in the infrared region, and the picture layer is formed outside the identification layer when viewed from the substrate. Medium.
また、請求項２に記載の発明は、励起光の波長領域と蛍光体から発光する蛍光の波長領域が、可視領域または赤外領域のいずれか一方の波長領域に属するか、または可視領域と赤外領域の両方に亘って属しており、前記蛍光の主なピーク波長は前記励起光の主なピーク波長とは異なることを特徴とする請求項１に記載の真正性識別媒体である。 In the invention according to claim 2, the wavelength region of the excitation light and the wavelength region of the fluorescence emitted from the phosphor belong to either the visible region or the infrared region, or the visible region and the red region. 2. The authenticity identification medium according to claim 1, which belongs to both outer regions, and wherein a main peak wavelength of the fluorescence is different from a main peak wavelength of the excitation light.
また、請求項３に記載の発明は、蛍光体が基材に含有されていることを特徴とする請求項１または２に記載の真正性識別媒体である。 The invention according to claim 3 is the authenticity identification medium according to claim 1 or 2, wherein the phosphor is contained in the base material.
また、請求項４に記載の発明は、識別層がパターン状に形成されていることを特徴とする請求項１〜３のいずれか１項に記載の真正性識別媒体である。 The invention according to claim 4 is the authenticity identification medium according to any one of claims 1 to 3, wherein the identification layer is formed in a pattern.
また、請求項６に記載の発明は、常温より高い温度に保持するか、または可視光を照射する前処理工程と、前記前処理工程が終了する前か終了直後に、可視領域または近赤外領域の励起光を照射すると同時に真正性識別媒体から発せられる可視領域または近赤外領域の蛍光を測定する励起光照射・蛍光測定工程と、前記前処理が常温より高い温度に保持した時の可視領域または近赤外領域の蛍光と可視光を照射した時の可視領域または近赤外領域の蛍光の発光強度の測定結果を比較する蛍光測定結果比較工程と、から構成され、
前記前処理工程は、第一前処理工程と第二前処理工程とがあり、
第一前処理工程は、前記真正性識別媒体を４０℃〜２００℃に保持する工程であり、
第二前処理工程は、可視光を前記真正性識別媒体に照射する工程であり、
励起光照射・蛍光測定工程は、前記第一前処理工程または前記第二前処理工程が継続中または終了直後に励起光を前記真正性識別媒体に照射すると同時に前記真正性識別媒体から発せられる蛍光を測定する工程であり、
蛍光測定結果比較工程は、前記第一前処理工程とそれに続く励起光照射・蛍光測定工程によって得られた蛍光測定結果Ａと前記第二前処理工程とそれに続く励起光照射・蛍光測定工程によって得られた蛍光測定結果Ｂを比較することによって実施することを特徴とする真正性識別媒体の識別方法である。
Further, the invention according to claim 6 is a pretreatment step of maintaining a temperature higher than normal temperature or irradiating visible light, and a visible region or a near infrared region before or after the pretreatment step is finished. Excitation light irradiation / fluorescence measurement process that measures fluorescence in the visible region or near infrared region emitted from the authentic identification medium at the same time as the excitation light of the region, and visible when the pretreatment is held at a temperature higher than room temperature a fluorescence measurement result comparison step of comparing the measurement of the emission intensity of the fluorescence in the visible region or near infrared region results when irradiated with fluorescence and visible light region or near infrared region, is composed of,
The pretreatment step includes a first pretreatment step and a second pretreatment step,
The first pretreatment step is a step of maintaining the authenticity identification medium at 40 ° C. to 200 ° C.,
The second pretreatment step is a step of irradiating the authenticity identification medium with visible light,
In the excitation light irradiation / fluorescence measurement step, the fluorescence emitted from the authenticity identification medium at the same time when the authenticity identification medium is irradiated with the excitation light while the first pretreatment step or the second pretreatment step is continuing or immediately after completion. Is the process of measuring
The fluorescence measurement result comparison step is obtained by the fluorescence measurement result A obtained by the first pretreatment step and the subsequent excitation light irradiation / fluorescence measurement step, the second pretreatment step, and the subsequent excitation light irradiation / fluorescence measurement step. This is a method of identifying an authenticity identification medium, which is performed by comparing the obtained fluorescence measurement results B.
また、請求項７に記載の発明は、蛍光測定結果Ａと蛍光測定結果Ｂは、それぞれ蛍光の発光強度の測定結果であり、蛍光測定結果Ｂが蛍光測定結果Ａより大きいと識別された時に真正であると判定することを特徴とする請求項６に記載の真正性識別媒体の識別方法である。 Further, in the invention according to claim 7, the fluorescence measurement result A and the fluorescence measurement result B are respectively the measurement results of the fluorescence emission intensity, and are authentic when the fluorescence measurement result B is identified as being larger than the fluorescence measurement result A. The authenticity identification medium identification method according to claim 6, wherein the authenticity identification medium identification method is determined.
本発明は、以上の構成であるから、下記に示す如き効果を奏することができる。 Since this invention is the above structure, there can exist an effect as shown below.
即ち、上記請求項１に係る発明によれば、偽造が困難であり、他の蛍光体との判別がしやすい蛍光体を識別媒体に設けることで、識別を可能とする効果を得られる。特には、熱をかけている間または直後に、励起波長の光を照射したときの蛍光の発光強度よりも、可視光を一定時間照射した後に励起波長の光を照射したときの蛍光の発光強度が高いという、蓄光とも通常の蛍光体とも異なる効果を有し、識別が可能となるという効果が得られる。 That is, according to the first aspect of the present invention, it is possible to obtain the effect of enabling discrimination by providing the identification medium with a phosphor that is difficult to counterfeit and is easily distinguishable from other phosphors. In particular, during or immediately after applying heat, the fluorescence emission intensity when irradiated with excitation wavelength light after irradiation with visible light for a certain period of time, rather than the fluorescence emission intensity when irradiation with excitation wavelength light is performed. The effect of being high and having a different effect from phosphorescence and ordinary phosphors and enabling identification is obtained.
また、上記請求項２に係る発明によれば、励起波長と蛍光の発光の波長が、可視や赤外とすることで、目視で安全に検証可能となったり、検証機をつくりやすくなったりするという効果が得られる。 According to the second aspect of the present invention, the excitation wavelength and the emission wavelength of fluorescence are visible or infrared, so that it can be safely verified visually or a verification machine can be easily manufactured. The effect is obtained.
また、上記請求項３に係る発明によれば、本発明の識別媒体に対し、偽造を困難にするための蛍光体を基材に抄きこむか、又は、練り込むことにより、基材自体に機能を持たせ、任意の光を照射し、読み取った場合に、識別する判定をすることが可能となる効果を得られる。また、基材に含有させるため、印刷よりも層を厚くすることが可能となるため、蛍光体を多量に含有させることが可能となり、判定しやすいという効果が得られる。 In addition, according to the invention according to claim 3 described above, the phosphor for making it difficult to counterfeit is incorporated into the base material, or kneaded into the base material, or the base material itself functions. , Irradiating with arbitrary light and reading, it is possible to obtain an effect that makes it possible to make a determination of identification. Further, since it is contained in the base material, it is possible to make the layer thicker than printing, so that it is possible to contain a large amount of phosphor, and the effect of being easy to determine is obtained.
また、上記請求項４に係る発明によれば、本発明の識別媒体に対し、偽造を困難にするための蛍光体がインキに含まれて成ることにより、印刷することで設けることができるために機能をパターン状に設けることができ、蛍光体の有無を一部分に設けることができるとともに、さらにコード化した識別が可能となる効果を得られる。 According to the fourth aspect of the present invention, since the phosphor for making counterfeiting difficult is included in the ink for the identification medium of the present invention, it can be provided by printing. Functions can be provided in a pattern, the presence or absence of a phosphor can be provided in part, and an effect of enabling further coded identification can be obtained.
また、上記請求項５に係る発明によれば、本発明の識別媒体に対し、偽造を困難にするための蛍光体が含まれる層よりも外側の層に印刷を設けることにより、自由なデザインを設けることができるため、外観を気にせず、任意の光を照射し、読み取った場合に、真正か否かの判定ができる効果を得られる。 Further, according to the invention according to claim 5 described above, the identification medium of the present invention can be freely designed by providing printing on a layer outside the layer containing the phosphor for making forgery difficult. Since it can be provided, it is possible to obtain an effect of determining whether the image is authentic or not when the light is irradiated and read without worrying about the appearance.
また、上記請求項６に係る発明によれば、熱をかけている間または直後に励起波長の光を照射したときの発光強度と、可視光を一定時間照射した後に励起波長の光を照射したときの発光強度を検出することで、真正か否かの判定が可能となる効果が得られる。 In addition, according to the invention according to claim 6, the light emission intensity when the light having the excitation wavelength is irradiated during or immediately after the heat is applied, and the light having the excitation wavelength is irradiated after the visible light is irradiated for a certain period of time. By detecting the emission intensity at that time, it is possible to determine whether or not the image is authentic.
また、上記請求項７に係る発明によれば、熱をかけている間または直後に励起波長の光を照射したときの発光強度Ａと、可視光を一定時間照射した後に励起波長の光を照射したときの発光強度Ｂを検出し、発光強度Ｂが発光強度Ａより大きい時に、真正であると判定できるという効果をもたらす。 Further, according to the invention of claim 7, the emission intensity A when the light having the excitation wavelength is irradiated during or immediately after the heat is applied, and the light having the excitation wavelength is irradiated after the visible light is irradiated for a certain period of time. The emission intensity B is detected, and when the emission intensity B is greater than the emission intensity A, the authenticity can be determined.
以下、図面に従い、本発明に係わる識別媒体について詳しく説明する。 The identification medium according to the present invention will be described in detail below with reference to the drawings.
図１は、本発明の識別媒体の一実施形態を示す平面図であり、図２は図１における一実施形態のＸ−Ｘ’の断面図である。この識別媒体１は、偽造を防止するために識別層２１が設けられている。 FIG. 1 is a plan view showing an embodiment of the identification medium of the present invention, and FIG. 2 is a cross-sectional view taken along the line X-X ′ of the embodiment shown in FIG. The identification medium 1 is provided with an identification layer 21 to prevent forgery.
図３は、本発明の識別媒体の一実施形態を示す平面図であり、図４は、図３における識別媒体の一実施形態のＹ−Ｙ’の断面図である。図５は、図３における識別媒体の図４とは別の一実施形態のＹ−Ｙ’の断面図である。また、図５は、図３における識別媒体の図４とは別の一実施形態のＹ−Ｙ’の断面図である。図６は、本発明の識別媒体を検証する方法の一例をあげた説明図である。 FIG. 3 is a plan view showing one embodiment of the identification medium of the present invention, and FIG. 4 is a cross-sectional view taken along Y-Y ′ of one embodiment of the identification medium in FIG. 3. FIG. 5 is a cross-sectional view taken along line Y-Y ′ of an embodiment different from FIG. 4 of the identification medium in FIG. 3. 5 is a cross-sectional view taken along line Y-Y ′ of an embodiment different from FIG. 4 of the identification medium in FIG. 3. FIG. 6 is an explanatory diagram showing an example of a method for verifying the identification medium of the present invention.
以下に本発明の識別媒体１を構成する各層の材料や形成方法について、具体的に説明する。 Hereinafter, the material and forming method of each layer constituting the identification medium 1 of the present invention will be specifically described.
本発明の基材１１は、蛍光の性質がある物質を含有していない基材が好ましい。本発明の機能を持たせるための蛍光体とは別の目的で使用される漂白剤等は、入っていない方が好ましいが、含有しているものでも使用することはできる。使用される基材の物質としては、それぞれの用途に応じて選定される。例えば、この識別媒体１がチケットの一部に設ける場合、例えば上質紙が選定されるが、カードの一部に本発明の識別媒体１を設ける場合には塩ビやＰＥＴ等のプラスチックのシートを選定する。また、パッケージの一部に本発明の識別媒体１を設ける場合には、例えば、コートボール紙を使用したり、ラベルに使用する場合には、タック加工をされた上質紙やコート紙を使用したりする。さらには、貼り替え防止の観点から、共に脆性を有するフィルム、例えば、セルロースアセテート、低密度ポリエチレン、ポリスチレン、ポリフェニレンサルファイドなどの高結晶性プラスチック素材を溶液成膜からフィルム化した物を使用したりする。また、用途により、基材１１の必要性のない場合には、基材に剥離層を設けて、剥離できるようにしても良い。 The substrate 11 of the present invention is preferably a substrate that does not contain a substance having fluorescence properties. The bleaching agent used for the purpose different from the phosphor for imparting the function of the present invention is preferably not contained, but it can be used even if it is contained. The substrate material to be used is selected according to each application. For example, when the identification medium 1 is provided on a part of a ticket, for example, high-quality paper is selected, but when the identification medium 1 of the present invention is provided on a part of a card, a plastic sheet such as PVC or PET is selected. To do. Further, when the identification medium 1 of the present invention is provided in a part of the package, for example, coated cardboard is used, or when used for a label, tacky fine paper or coated paper is used. Or Furthermore, from the viewpoint of preventing re-sticking, a film that is both brittle, for example, a film obtained by forming a highly crystalline plastic material such as cellulose acetate, low density polyethylene, polystyrene, polyphenylene sulfide, etc. from a solution film is used. . Moreover, when there is no necessity of the base material 11 by a use, you may enable it to provide a peeling layer in a base material and to peel.
本発明の識別媒体１としての効果を持たせるために、識別層２１が設けられる。識別層２１は、励起波長の光（励起光５１）を照射したときのみ発光する蛍光体を含んだ層であり、蛍光体は熱をかけている間または直後に、励起波長の光を照射したときの発光強度よりも、可視光を一定時間照射した後に励起波長の光を照射したときの発光強度の方が高い性質を持つものである。 In order to have the effect as the identification medium 1 of the present invention, the identification layer 21 is provided. The identification layer 21 is a layer that includes a phosphor that emits light only when irradiated with light having an excitation wavelength (excitation light 51). The phosphor is irradiated with light having an excitation wavelength during or immediately after heating. The emission intensity when irradiated with light having an excitation wavelength after irradiation with visible light for a certain period of time is higher than the emission intensity at that time.
熱をかけている間または直後に、励起波長の光を照射したときの発光強度よりも、可視光を一定時間照射した後に励起波長の光を照射したときの発光強度が高い蛍光体を媒体中に設けることにより、一般的な蛍光体や蓄光体とは異なる特性を持たせることができる。一
般的な蛍光体は、熱をかけている間または直後に、励起波長の光を照射したときと、可視光を一定時間照射した後に励起波長の光を照射した時の発光の強度は同じである。この差を利用することにより、不正を防ぐ識別媒体を提供できる。
During or immediately after heating, a phosphor having a higher emission intensity in the medium when irradiated with excitation wavelength light after irradiation with visible light for a certain period of time than emission intensity when irradiation with excitation wavelength light is present in the medium. By providing in, it can have a characteristic different from a general fluorescent substance or phosphorescent body. In general phosphors, the intensity of emitted light is the same when irradiated with light of excitation wavelength during or immediately after heating, and when irradiated with light of excitation wavelength after irradiation of visible light for a certain period of time. is there. By using this difference, an identification medium that prevents fraud can be provided.
本発明に用いる蛍光体は、熱をかけている間または直後に、励起波長の光を照射したときの発光強度よりも、可視光を一定時間照射した後に励起波長の光を照射したときの発光強度が高く、蓄光体とも異なるものである。蓄光とは、物質が光をためて発光する性状を示すものをいい、硫化亜鉛（ＺｎＳ系）やアルミン酸ストロンチウム（ＳｒＡｌ2Ｏ4系）が知られている。蓄光は残光時間が長く、人間の目で見ても残光がわかる程度であり、例えば具体的には残光時間が数分のものから、1日以上のものまであるのに対し、本発明で用いる蛍光体は、目ではわからない程度の残光時間である。 The phosphor used in the present invention emits light when irradiated with light having an excitation wavelength after irradiation with visible light for a certain period of time, compared to the light emission intensity when irradiated with light having an excitation wavelength during or immediately after heating. It has high strength and is different from the phosphor. The term “light storage” refers to a substance that exhibits the property of emitting light by storing light, and zinc sulfide (ZnS system) and strontium aluminate (SrAl 2 O 4 system) are known. Phosphorescence has a long afterglow time and can be seen by human eyes.For example, the afterglow time ranges from a few minutes to over a day. The phosphor used in the invention has an afterglow time that is invisible to the eye.
本発明の蛍光体の励起波長と発光波長は、紫外可視、赤外のいずれかであり、可視領域、または、近赤外領域が望ましい。また、励起波長と発光波長で異なる波長領域があることが望ましいが、同じであっても良い。 The excitation wavelength and emission wavelength of the phosphor of the present invention are either ultraviolet-visible or infrared, and the visible region or the near-infrared region is desirable. Further, although it is desirable that there are different wavelength regions for the excitation wavelength and the emission wavelength, they may be the same.
また、通常、赤外光で励起させて、可視光で発光させるというアンチストークスタイプの蛍光体が報告されている。しかし、この発光の機構は通常のストークスタイプとは異なり、エネルギーの低い光を照射し、エネルギーの高い光を発光させることになるため、励起光となる赤外光は強い光が必要となり、可視光を目視で見るためには、非常に人間の目には危険な赤外レーザーを用いなければならない。しかし、本発明に使用する蛍光体は、光エネルギー等を予め蛍光体内に貯蓄し、その後、近赤外光や可視光などの照射により貯蓄したエネルギーを放出して可視発光する性質を有するものである。したがって、本発明の識別媒体では可視光で照射しておくことで、レーザー程の強い光でなくＬＥＤ等の光で人間の目で見える程度の光が発光するため、目視で確認することを可能にすることもできるし、検証機に安価で安全なＬＥＤを使用しても検出しやすい発光量が得られるため、検証機をつくることも容易となる。 Also, an anti-Stokes type phosphor that is usually excited with infrared light and emitted with visible light has been reported. However, this light emission mechanism differs from the normal Stokes type in that it emits light with low energy and emits light with high energy, so the infrared light that is the excitation light requires strong light and is visible. In order to see the light visually, an infrared laser that is very dangerous for the human eye must be used. However, the phosphor used in the present invention has the property of preliminarily storing light energy or the like in the phosphor and then emitting the energy stored by irradiation with near infrared light or visible light to emit visible light. is there. Therefore, when the identification medium of the present invention is irradiated with visible light, light that is visible to the human eye is emitted by light from an LED or the like rather than light as strong as a laser, and can be confirmed visually. It is also possible to obtain a light emission amount that is easy to detect even if an inexpensive and safe LED is used for the verification machine, and it is easy to make a verification machine.
本発明では基材１１自体が前記蛍光体を有する識別層２１となる場合もある。本発明に使用される蛍光体は、識別媒体１の基材１１が用紙である場合には抄き込んで形成され、基材１１がプラスチックである場合にはプラスチックの原料に練り込んで形成される。 In the present invention, the substrate 11 itself may be the identification layer 21 having the phosphor. The phosphor used in the present invention is formed by embossing when the substrate 11 of the identification medium 1 is paper, and is formed by kneading into a plastic raw material when the substrate 11 is plastic. The
識別層２１は、インキにより印刷にて設けることも可能である。インキにすることで、マークや文字でのパターニングが可能になるだけでなく、そのパターンをコード状にすることで、発光の確認をするとともに、機械でコードを確認することでコードの確認もでき、個別情報と真偽の判定の両方が同時に可能となる。 The identification layer 21 can also be provided by printing with ink. By using ink, not only can patterning with marks and letters be possible, but by making the pattern into a code, you can check the light emission and also check the code by checking the code with a machine. Both individual information and authenticity determination can be performed simultaneously.
識別層２１の印刷方式は、オフセット印刷、グラビア印刷、スクリーン印刷、フレキソ印刷、パッド印刷、活版印刷、インクジェット印刷等の方式を用いることができる。印刷方式により、インキの組成は異なるが、例えば、アクリル樹脂、ポリエステル樹脂、ウレタン樹脂等の樹脂を１０〜５０％、それぞれの印刷方式に合わせた溶剤を３０〜７０％とその他、添加剤と上記蛍光体を混合してインキ化することが可能である。その他、酸化重合型のインキや水系エマルジョンのインキに蛍光体を分散、または、溶解しても良い。 As the printing method of the identification layer 21, methods such as offset printing, gravure printing, screen printing, flexographic printing, pad printing, letterpress printing, and inkjet printing can be used. The composition of the ink differs depending on the printing method. For example, 10-50% of resin such as acrylic resin, polyester resin, urethane resin, 30-70% of solvent according to each printing method, and other additives and the above It is possible to mix phosphors into ink. In addition, the phosphor may be dispersed or dissolved in an oxidation polymerization type ink or an aqueous emulsion ink.
本発明の蛍光体としては、硫化物蛍光体（ＺｎＳ，ＣａＳ）があげられる。その一例として、硫化カルシウムを母体とし、これにサマリウム（Ｓｍ）およびユーロピウム（Ｅｒ）を賦活剤として添加したものがあげられる。また、アルカリ土類硫化物の混合物を母体とし、ビスマスおよびサマリウムを活性化剤として含むもの、硫化マグネシウムと硫化ストロンチウムの混合物（ＭｇxＳｒ1-xＳ）を母体とし、マグネシウムやストロンチウムを混
合したものがあげられる。
Examples of the phosphor of the present invention include sulfide phosphors (ZnS, CaS). As an example, calcium sulfide is used as a base, and samarium (Sm) and europium (Er) are added as activators. In addition, a mixture of alkaline earth sulfides containing bismuth and samarium as activators, a mixture of magnesium sulfide and strontium sulfide (Mg x Sr 1-x S), and magnesium and strontium were mixed. Things can be raised.
絵柄層３１は、複数の層からなるものでよい。通常の印刷に用いられるＹ（イエロー）、マゼンダ（Ｍ）、Ｃ（シアン）の他、これらを混ぜ合わせた、または、特殊な顔料を使用した特色インキを使用できる。さらに、識別層２１を隠蔽するための、識別層２１のパターンとは逆版のパターン印刷や白色の隠蔽層、または、その他着色した隠蔽層を識別層２１の外側に設けてもよい。さらに、また、隠蔽するため、また、外観や耐性向上のために絵柄層より外側にニスの層を設けても良いし、別の加飾効果のある光干渉効果のあるものを印刷や転写、貼り合わせにより、設けても良い。絵柄層の印刷方式は、オフセット印刷、フレキソ印刷、グラビア印刷、インクジェット印刷、スクリーン印刷、パッド印刷が好ましいが、その他の印刷方式で設けることもでき、また、転写機やラミネート機を用いることにより設けることができる。 The pattern layer 31 may be composed of a plurality of layers. In addition to Y (yellow), magenta (M), and C (cyan), which are used for normal printing, special color inks in which these are mixed or a special pigment is used can be used. Furthermore, a pattern printing reverse to the pattern of the identification layer 21, a white hiding layer, or another colored hiding layer for hiding the identification layer 21 may be provided outside the identification layer 21. Furthermore, in order to conceal and to improve the appearance and durability, a varnish layer may be provided outside the pattern layer, and another optical interference effect with a decorative effect may be printed or transferred. You may provide by bonding. The printing method of the pattern layer is preferably offset printing, flexographic printing, gravure printing, ink jet printing, screen printing, or pad printing, but can be provided by other printing methods, or by using a transfer machine or a laminating machine. be able to.
以下に、図６を用いて、本発明の識別媒体１を検証する識別方法を説明する。図６の（ａ）にて上記のように形成した識別媒体１に熱４１をかける。その後、（ｂ）のように、励起波長照射器５２により、励起光５１を照射する。このとき、熱４１をかけることにより蓄積していたエネルギーが逃げていくために、励起光５１を照射しても識別媒体１は発光しない。さらに、（ｃ）のように、可視光照射器６２により可視光６１を照射する。このとき、識別媒体１は可視光６１のエネルギーを蓄える。さらにまた、（ｄ）のように、励起波長照射機５２により、励起光５１を照射すると、識別媒体１は（ｂ）の場合とは異なり、発光する。これは、（ｃ）で蓄えられたエネルギーが、（ｄ）の励起光５１により放出して起こるものである。これを利用することにより、他のものでは検出できない光の有無を検証することにより、識別可能となる。 Below, the identification method which verifies the identification medium 1 of this invention is demonstrated using FIG. Heat 41 is applied to the identification medium 1 formed as described above in FIG. Thereafter, the excitation light 51 is irradiated by the excitation wavelength irradiator 52 as shown in FIG. At this time, since the energy accumulated by applying the heat 41 escapes, the identification medium 1 does not emit light even when the excitation light 51 is irradiated. Furthermore, the visible light 61 is irradiated by the visible light irradiator 62 as shown in FIG. At this time, the identification medium 1 stores the energy of the visible light 61. Furthermore, as shown in (d), when the excitation light 51 is irradiated by the excitation wavelength irradiator 52, the identification medium 1 emits light unlike the case of (b). This occurs when the energy stored in (c) is emitted by the excitation light 51 in (d). By using this, it becomes possible to identify by verifying the presence or absence of light that cannot be detected by others.
具体的には、図６（ｂ）でかける熱４１は、識別層２１に用いる蛍光体によるが、４０℃〜２００℃で、２０秒間〜２０分間かけるものが好ましいが、運用面を考慮して８０℃〜１００℃で、１分間〜１０分間かけることが最も望ましく、この条件でなくても識別層２１の発光が弱まっていれば良い。 Specifically, the heat 41 applied in FIG. 6B depends on the phosphor used for the identification layer 21, but is preferably applied at 40 ° C. to 200 ° C. for 20 seconds to 20 minutes. It is most desirable to apply at 1 to 10 ° C. for 1 to 10 minutes, and it is sufficient that the light emission of the identification layer 21 is weakened even under this condition.
図６における励起光照射器５２は、励起波長のＬＥＤが望ましいが、蛍光灯やレーザー等、発光体の励起波長の光であれば良い。また、可視光５１は、説明図では可視光照射器６２により照射する光であり、ＬＥＤ又は蛍光灯、太陽光が望ましいが、その他のものでも良い。 The excitation light irradiator 52 in FIG. 6 is preferably an LED having an excitation wavelength, but may be light having an excitation wavelength of a light emitter such as a fluorescent lamp or a laser. Further, the visible light 51 is light emitted from the visible light irradiator 62 in the explanatory diagram, and is preferably an LED, a fluorescent lamp, or sunlight, but may be other.
次に、本発明の実施例について説明する。
＜実施例１＞
まず、上質紙にスクリーン印刷方式にて、図１のように識別媒体の一部の領域に識別層となるインキを２μｍ印刷し、実施例１の識別媒体を得た。
［識別層のインキ組成］
蛍光体 硫化カルシウム蛍光体（ＣａＳ）２５重量部
塩化酢酸ビニル ２５重量部
シクロヘキサノン ３０重量部
イソホロン ２０重量部
＜比較例＞
実施例と同様にして、通常の蛍光体、および、蓄光体から成るインキを２μｍ印刷し、蛍光印刷サンプルおよび蓄光印刷サンプルを得た。
［蛍光のインキ組成］
ルミコール１０００（日本蛍光化学社製）２５重量部
塩化酢酸ビニル ２５重量部
シクロヘキサノン ３０重量部
イソホロン ２０重量部
［蓄光のインキ組成］
ルミノーバＧＬＬ３００Ｍ（根本特殊化学社製）２５重量部
塩化酢酸ビニル ２５重量部
シクロヘキサノン ３０重量部
イソホロン ２０重量部
Next, examples of the present invention will be described.
<Example 1>
First, by using a screen printing method on high-quality paper, 2 μm of an ink serving as an identification layer was printed on a partial area of the identification medium as shown in FIG. 1 to obtain the identification medium of Example 1.
[Ink composition of identification layer]
Phosphor Calcium sulfide phosphor (CaS) 25 parts by weight Vinyl acetate 25 parts by weight Cyclohexanone 30 parts by weight Isophorone 20 parts by weight <Comparative Example>
In the same manner as in the example, 2 μm of an ink composed of a normal phosphor and a phosphorescent material was printed to obtain a fluorescent print sample and a phosphorescent print sample.
[Fluorescent ink composition]
Lumicol 1000 (manufactured by Nippon Fluorochemicals Inc.) 25 parts by weight vinyl chloride 25 parts by weight cyclohexanone 30 parts by weight isophorone 20 parts by weight [phosphorescent ink composition]
Luminova GLL300M (manufactured by Nemoto Special Chemical) 25 parts by weight Vinyl acetate 25 parts by weight Cyclohexanone 30 parts by weight Isophorone 20 parts by weight
上記実施例１で得た識別媒体、および、比較例で得た蛍光印刷サンプルと蓄光印刷サンプルを、８０℃のオーブンに入れ、それぞれの励起波長（赤外線８００ｎｍ、紫外線３６５nｍ、紫外線３６５ｎｍ）のＬＥＤの光を照射した。その後、可視光を２０分間照射した後、再度それぞれの励起波長のＬＥＤの光を照射した。さらに、励起波長のＬＥＤの照射を止めて、５分間放置した。これらの各印刷サンプルとそれぞれの励起光照射、または、照射後に放置した際の発光の有無の結果を表１に示した。 The identification medium obtained in Example 1 above, and the fluorescent print sample and the phosphorescent print sample obtained in the comparative example are placed in an oven at 80 ° C., and the LEDs of the respective excitation wavelengths (infrared 800 nm, ultraviolet 365 nm, ultraviolet 365 nm) are used. Irradiated with light. Then, after irradiating visible light for 20 minutes, the light of LED of each excitation wavelength was irradiated again. Further, the irradiation of the LED having the excitation wavelength was stopped and left for 5 minutes. Table 1 shows the results of the presence or absence of light emission when these print samples were irradiated with each excitation light or left after irradiation.
表１のように、本発明で得た識別媒体は、本発明の識別方法により、通常の蛍光印刷サンプルや蓄光印刷サンプルとは異なる結果が得られた。識別媒体はオーブンに入れ、熱をかけた直後の発光は小さくて見えず、その後、可視光照射後に励起光を照射した場合に発光を見ることが可能となった。さらに、励起波長のＬＥＤの照射をやめて５分間放置した場合に、発光は確認できなかった。 As shown in Table 1, the identification medium obtained by the present invention obtained different results from the normal fluorescent printing sample and the phosphorescent printing sample by the identification method of the present invention. The identification medium was placed in an oven, and the light emission immediately after heating was small and did not appear. After that, it was possible to see the light emission when the excitation light was irradiated after the visible light irradiation. Furthermore, when the irradiation with the LED having the excitation wavelength was stopped and left for 5 minutes, no light emission was confirmed.
一方、蛍光印刷サンプルはオーブンに入れ、熱をかけた直後でも、発光が確認され、その後、可視光照射後に励起光を照射した場合でも発光が確認された。さらに、励起波長のＬＥＤの照射をやめた場合には、すぐに発光は確認できなくなり、５分放置した後は確認することができなかった。 On the other hand, the fluorescence printed sample was confirmed to emit light even immediately after being put in an oven and heated, and then the emission was confirmed even when irradiated with excitation light after visible light irradiation. Furthermore, when the irradiation of the LED having the excitation wavelength was stopped, the light emission could not be confirmed immediately, and it was not possible to confirm after leaving it for 5 minutes.
また、蓄光印刷サンプルは、オーブンに入れ、熱をかけた直後では、発光が弱く確認され、その後、可視光照射後に励起光を照射した場合でも発光が確認された。さらに、励起波長のＬＥＤの照射をやめた場合でも光り続け、５分放置した後でも発光が確認された。 In addition, the phosphorescent printed sample was confirmed to be weak in light emission immediately after being put in an oven and heated, and then light emission was confirmed even when excitation light was irradiated after irradiation with visible light. Further, even when the irradiation of the LED having the excitation wavelength was stopped, the light continued to be emitted, and the light emission was confirmed even after being left for 5 minutes.
このように、これらの各印刷サンプルとそれぞれの励起光照射、または、照射後に放置した際の発光の有無の結果、本発明で得た識別媒体は、本発明の識別方法により、通常の蛍光印刷サンプルや蓄光印刷サンプルとは異なり識別することができた。
１：識別媒体
１１：基材
２１：識別層
３１：絵柄層
４１：熱
５１：励起光
５２：励起波長照射器
６１：可視光
６２：可視光照射器
1: Identification medium
11: Base material 21: Identification layer 31: Picture layer 41: Heat 51: Excitation light 52: Excitation wavelength irradiator 61: Visible light 62: Visible light irradiator
Claims (6)
前記蛍光体は、常温より高い温度に保持するか、または保持終了の直後に可視領域または近赤外領域の励起光を照射した時の可視領域または近赤外領域の蛍光の発光強度よりも、常温にて可視光を照射した後に前記励起光を照射した時の蛍光の発光強度の方が高い蛍光体であり、
前記識別層に含有される前記蛍光体の蛍光の波長領域が赤外領域にあり、前記基材から見て前記絵柄層は前記識別層より外側に形成されていることを特徴とする真正性識別媒体。 At least an identification layer containing a phosphor and used for determining authenticity, a pattern layer for displaying a pattern and information, and a base material for forming the identification layer and the pattern layer An authenticity identification medium
The phosphor is held at a temperature higher than normal temperature, or more than the emission intensity of fluorescence in the visible region or near infrared region when irradiated with excitation light in the visible region or near infrared region immediately after the end of holding, high phosphor der towards the emission intensity of fluorescence when irradiated with the excitation light after the irradiation with the visible light at room temperature is,
Authenticity identification characterized in that the fluorescent wavelength region of the phosphor contained in the identification layer is in the infrared region, and the picture layer is formed outside the identification layer when viewed from the substrate. Medium.
前記前処理工程は、第一前処理工程と第二前処理工程とがあり、
第一前処理工程は、前記真正性識別媒体を４０℃〜２００℃に保持する工程であり、
第二前処理工程は、可視光を前記真正性識別媒体に照射する工程であり、
励起光照射・蛍光測定工程は、前記第一前処理工程または前記第二前処理工程が継続中または終了直後に励起光を前記真正性識別媒体に照射すると同時に前記真正性識別媒体から発せられる蛍光を測定する工程であり、
蛍光測定結果比較工程は、前記第一前処理工程とそれに続く励起光照射・蛍光測定工程によって得られた蛍光測定結果Ａと前記第二前処理工程とそれに続く励起光照射・蛍光測定工程によって得られた蛍光測定結果Ｂを比較することによって実施することを特徴とする真正性識別媒体の識別方法。 Authentic identification at the same time as the pre-treatment step of maintaining the temperature higher than normal temperature or irradiating visible light, and irradiating the excitation light in the visible region or near infrared region before or just after the pre-treatment step is finished Excitation light irradiation / fluorescence measurement process for measuring fluorescence in the visible region or near infrared region emitted from the medium, and fluorescence and visible light in the visible region or near infrared region when the pretreatment is held at a temperature higher than room temperature. A fluorescence measurement result comparison step for comparing the measurement result of the fluorescence emission intensity in the visible region or near infrared region when irradiated with,
The pretreatment step includes a first pretreatment step and a second pretreatment step,
The first pretreatment step is a step of maintaining the authenticity identification medium at 40 ° C. to 200 ° C.,
The second pretreatment step is a step of irradiating the authenticity identification medium with visible light,
In the excitation light irradiation / fluorescence measurement step, the fluorescence emitted from the authenticity identification medium at the same time when the authenticity identification medium is irradiated with the excitation light while the first pretreatment step or the second pretreatment step is continuing or immediately after completion. Is the process of measuring
The fluorescence measurement result comparison step is obtained by the fluorescence measurement result A obtained by the first pretreatment step and the subsequent excitation light irradiation / fluorescence measurement step, the second pretreatment step, and the subsequent excitation light irradiation / fluorescence measurement step. A method of identifying an authenticity identification medium, which is performed by comparing the obtained fluorescence measurement results B.
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