Authenticity discrimination printed matter and authenticity discrimination method

Abstract

To provide a printed matter capable of performing high precision authenticity discrimination by mechanical detection, by eliminating imitation through the addition of other infrared emitters while maintaining high secrecy of the infrared fluorescent substance used as the discrimination element.SOLUTION: The present invention is an authenticity discrimination printed matter characterized by having a first discrimination region on at least part of a substrate that exhibits a first light emission in a predetermined wavelength range, different from the excitation light, when irradiated with excitation light of a predetermined wavelength range, and a second discrimination region that exhibits a second light emission weaker in intensity than the first light emission due to at least one difference among line area ratio, mixing ratio of light-emitting materials, and film thickness, between the first discrimination region and the second discrimination region.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an anti-counterfeit printed matter using an infrared emitting material. [Background technology]

[0002] Counterfeit-resistant printed materials, such as banknotes, passports, revenue stamps, securities, identification cards, various tickets, and security labels, require advanced counterfeit prevention and authenticity detection technologies.

[0003] One of these anti-counterfeiting and authenticity determination technologies is a method of attaching an illuminant (hereinafter referred to as an "infrared illuminant") that emits light in the near-infrared region invisible to the human eye when irradiated with light of a specific wavelength, and then detecting this light emission with a reading device to determine authenticity.

[0004] The infrared emitting material used in the authenticity determination method is white with low coloring power and is difficult to see, so a pattern with the infrared emitting material can be formed as a latent image. Furthermore, when it is mixed with other coloring pigments, the presence of the emitting material is concealed, making it difficult to notice that an infrared emitting material has been added, making clever counterfeiting and alteration difficult.

[0005] For example, one example of an anti-counterfeit printed matter using an infrared emitting material is disclosed in which a stealth thermal transfer recording layer is formed on a transfer target material, the layer being a blend of a heat-fusible material that does not absorb the excitation light or light emitted by the infrared fluorescent material and an infrared fluorescent material, and a thin film that is colored in a color that can be recognized by visible light and that transmits the excitation light of the infrared fluorescent material is laminated over the layer, and the authenticity of the anti-counterfeit printed matter is determined by detecting it with an infrared detection defector in which detection conditions have been registered in advance (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-213074 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the technology of Patent Document 1, the stealth thermal transfer recording layer to which the infrared fluorescent substance, which is the distinguishing factor, is added is covered with a concealing layer so that it cannot be seen from the outside. However, once it is discovered that the infrared fluorescent substance has been added, there is a risk that an imitation product that can be detected by an infrared detection defector can be produced by obtaining the infrared fluorescent substance and adding a certain amount or more of the infrared fluorescent substance using any method.

[0008] For these reasons, there has been a demand for printed matter that has a high degree of concealment in the infrared light-emitting element that is the distinguishing factor, that eliminates imitations that involve the addition of some kind of infrared light-emitting element, and that allows for highly accurate authenticity determination by machine detection. [Means for solving the problem]

[0009] The present invention is an authenticity-discriminating printed matter in which two discrimination areas having different luminescence intensities are formed, and when irradiated with excitation light in a predetermined wavelength range, a first luminescence can be detected by a first detection means, and both the first luminescence and the second luminescence can be detected by irradiation with laser light having a higher luminescence intensity than the excitation light of the first detection means, or by a second detection means which is a detector having a higher detection sensitivity than the detector of the first detection means, and which is characterized by having, on at least a portion of a substrate, a first discrimination area which emits a first luminescence in a predetermined wavelength range different from the excitation light when irradiated with excitation light, and a second discrimination area which emits a second luminescence having a lower luminescence intensity than the first luminescence by differing from the first discrimination area in at least one of the image area ratio, the composition ratio of the luminescent material, and the film thickness.

[0010] The present invention is a method for determining the authenticity of an authenticity discriminant printed matter, which comprises a first detection step in which excitation light is irradiated onto a first discrimination area and a second discrimination area and only the first emission is detected by a first detection means, a second detection step in which excitation light is irradiated onto the first discrimination area and the second discrimination area and the first emission and the second emission are detected by a second detection means, and a determination that the matter is authentic if the first emission is detected by the first detection step and the first emission and the second emission are detected by the second detection step. [Effects of the Invention]

[0011] The authenticity-determining printed matter of the present invention is highly confidential because authenticity is determined using an invisible machine-readable element.Furthermore, the substrate is provided with both an area that can be machine-detected by a specific first detection means and an area that cannot be machine-detected, and the same area can be authenticated in both areas by a second detection means.The printed matter is determined to be "genuine" only if all detection criteria are met, thereby eliminating imitations that involve the addition of some kind of infrared emitting material and enabling highly accurate authenticity determination. [Brief explanation of the drawings]

[0012] [Figure 1] A diagram showing an example of an authenticity verification print (A1) [Figure 2] Whether or not an example of a luminescent composition can be detected by the first detector (D1) [Figure 3] A diagram showing an example of an authenticity verification print (A2) [Figure 4] Detection of another example of a luminescent composition by the first detector (D1) [Figure 5] An example of how to determine authenticity [Figure 6] FIG. 1 shows an authenticity discriminant printed matter (A3) according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] Next, a description will be given of a form for carrying out the present invention, but the present invention is not limited to this, and other embodiments are also included as long as they are within the scope of the technical ideas described in the claims.

[0014] Fig. 1 shows an authenticity discrimination printed matter (A1) in the first embodiment. Fig. 1(a) is a plan view of the authenticity discrimination printed matter (A1), and Fig. 1(b) is an AA' cross-sectional view of the authenticity discrimination printed matter (A1). As shown in Figs. 1(a) and 1(b), the authenticity discrimination printed matter (A1) has, in at least a part of the base material (1), a first discrimination region (2) that emits a first light emission and a second discrimination region (4) that emits a second light emission.

[0015] (discrimination area) In this embodiment, the first discrimination region (2) is a region where the first luminescence can be detected by the first detection means, and the second discrimination region (4) is a region where the second luminescence cannot be detected by the first detection means. Note that additional information (3) such as numbers, letters, photographs, etc. may be provided in the margins of the base material (1) other than the first discrimination region (2) and the second discrimination region (4), and the additional information (3) may overlap part of the first discrimination region (2) and the second discrimination region (4) as long as it does not interfere with detection.

[0016] The first discrimination region (2) and the second discrimination region (4) may be arranged adjacent to each other as long as they do not overlap. In this specification, "adjacent" means that at least a portion of the two adjacent regions is in contact with each other.

[0017] Both the first discrimination region (2) and the second discrimination region (4) are formed from a luminescent composition containing a luminescent material that emits light in a predetermined wavelength range different from the excitation light when exposed to excitation light in that wavelength range.

[0018] The first discrimination region (2) and the second discrimination region (4) are formed with at least one difference in film thickness, such as the blend ratio of the light-emitting material, the type of light-emitting material, the image area ratio, the number of overprints, or the depth of the intaglio plate surface, so that the wavelength ranges of the first and second emissions emitted by the excitation light are the same but the emission intensities are different. In any case, the detection conditions and detection sensitivity of the first detection means can be adjusted so that the first emission from the first discrimination region (2) is detectable but the second emission from the second discrimination region (4) is not detectable. Specific examples of these will be described later.

[0019] (luminous body) The light emitter is not particularly limited as long as it emits light in a predetermined wavelength range different from the excitation light when exposed to excitation light in a predetermined wavelength range, and any known light emitter can be used. The excitation light may be in the ultraviolet range, visible light range, or infrared range.

[0020] The light emitter used in the present invention may be one type or a mixture of two or more types, and includes an upconversion material, which is a light emitter that absorbs near-infrared light and emits visible light.

[0021] As a light emitter with the above characteristics, Nd 0.5 Yb 0.2 Na5(WO4)4 and Nd 0.9 Yb 0.1 Na5(MoO4)4, Nd 0.1 Yb 0.1 Gd 0.1 Y 0.7 PO4, Li(Nd,Yb)PO 12 , (L u , Y b , N d )2O2S, Ca k (D1)(A 1-x-y ,Nd x ,Yb y )2(RO4) m (D=Li,Ag,Al,Ga,In, A=Sc,Y,La,Gd,Lu,Al,Ga,In, R=Mo,W,V), Y 0.84 Yb 0.15 Er 0.01 F3, NaY 0.69 Yb0.30 Er 0.01 F4, BaY 1.34 Yb 0.60 Er 0.06 F4, Y 0.74 Yb 0.25 Er 0.01 OCl, Y 0.65 Yb 0.35 Tm 0.001 F 3、 A 1-x-y Nd x Yb y PO4 (where A is at least one element selected from Al, Bi, B, In, Ga, Sc, Gd, Ce, Y, Lu, and La, and 0≦x≦0.9, 0≦y≦0.9, 0 <x+y≦1)、LiNdP4O 12 、 E 2-r-s Nd r Yb s Ca(MoO4)8, RE2O2CO3:Nd (RE=La, Gd, Y), AQO3:X,Y,Z (A=Ca, Sr, Ba, Q=Ti, Zr, X=Nd, Yb, Y=Al, Ga, In, Z=Sc, Y, Gd, Lu, La), and Y as an upconversion luminescent material. 0.84 Yb 0.15 Er 0.01 F3, NaY0 .69 Yb 0.30 Er 0.01 F4, BaY 1.34 Yb 0.60 Er 0.06 F4, Y 0.74 Yb 0.25 Er 0.01 OCl, Y 0.65 Yb 0.35 Tm 0.001 F 3、 CaAlO 19 :Er 3+ ,Yb 3+ , YTa7O 19 :Er 3+ ,Yb 3+ etc.

[0022] Other luminescent materials include cyanine dyes such as indocyanine green, PREX710 (xanthene), near-infrared fluorescent dyes (Cosmobio Co., Ltd.), aminobenzopyranoxanthene dyes (ABPX), Donor-Acceptor-Donor (dAd) dyes, N-hydroxysuccinimide, organic fluorescent materials such as TPA radical derivatives (Kansai University, School of Chemistry and Biotechnology, Department of Chemistry and Materials Engineering), single-walled carbon nanotubes, oxidized carbon nanotubes, and quantum dots such as PbS, PbSe, and HgSe / Te.

[0023] (Light-emitting composition) The luminescent composition is composed of at least the luminescent material and a binder component, and depending on the binder, various adjusting agents such as a photopolymerization initiator, a drying agent, a dispersant, a gelling agent, a surfactant, and a lubricant may be blended.

[0024] (binder) Examples of binders include thermoplastic resins such as acrylic, maleic acid, rosin, epoxy, silicone, and butyral; oils and fats such as linseed oil, olive oil, castor oil, and sunflower oil; higher fatty acids such as linoleic acid, linolenic acid, eleostearic acid, lauric acid, myristic acid, palmitic acid, stearic acid, fromic acid, and hebenic acid; esters such as fatty acid esters; amides such as stearinamide and oleamide; resins such as polyamide resins, polyester resins, epoxy resins, polyurethane resins, acrylic resins, vinyl chloride resins, cellulose resins, polyvinyl resins, petroleum resins, ethylene-vinyl acetate copolymer resins, phenolic resins, styrene resins, rosin-modified resins, and terbine resins; elastomers such as natural rubber, styrene-butadiene rubber, isoprene rubber, and chloroprene rubber; ultraviolet-curable resins consisting of acrylate and methacrylate oligomers and monomers; and heat-melting components such as polyester resins and vinyl chloride-vinyl acetate copolymers. , saturated copolymer polyester, (meth)acrylic resin, modified olefin polymer, allyl resin, chlorinated olefin polymer, acid-modified chlorinated olefin polymer, unsaturated carboxylic acid, urethane resin, isocyanate, ethylene-methacrylic acid copolymer resin, higher fatty acid ester acrylic copolymer resin, resol-type phenolic resin, methylolated urea resin, methylolated melamine resin, polyvinyl alcohol, polyethylene oxide, polyacrylamide, carboxymethyl cellulose, etc. can be used.

[0025] (auxiliary agent / adjuster) Examples of the auxiliary that can be used include photopolymerization initiators such as benzil ketals, α-hydroxyacetophenones, α-aminoacetophenones, alkylphenone compounds, acylphosphine oxide compounds, oxime ester compounds, and titanocenes; photosensitizers such as thioxanthone, imidazoles, coumarins, pyrazolines, thiophenes, naphthalenes, and oxazoles; thermal polymerization inhibitors such as hydroquinone and nitrosamines; acid generators such as sulfonium salts, iodonium salts, diazonium salts, and ferrocenium salts; and drying agents such as naphthenic acid, octylic acid, resin acids, and oil-soluble carboxylic acids such as tall oil fatty acids, and resin acid salts of polyvalent metals such as cobalt, manganese, cerium, zirconium, lead, iron, zinc, copper, vanadium, barium, and calcium.

[0026] Examples of waxes that can be used include natural waxes such as whale wax, beeswax, lanolin, carbona wax, candelilla wax, and montan wax, and synthetic waxes such as paraffin wax, microcrystalline wax, oxide wax, ester wax, and low molecular weight polyethylene.

[0027] Polyaminoamides, hydroxyl group-containing carboxylic acid esters, acrylic block copolymers, alkylol ammonium salt dispersants, siloxanes, acrylic surface conditioners, adhesion promoters having acidic groups, ketone, ester, and alcohol-based leveling agents, silicone-based and polymer-based defoamers, and antioxidants such as 2,4,6-tri-tert-butylphenol can be used.

[0028] Furthermore, organic or inorganic color pigments, luster pigments such as pearl pigments, functional materials such as magnetic materials and chromic materials, extender pigments such as calcium carbonate, barium sulfate and silicon oxide may be blended within the range that does not inhibit luminescence. In consideration of detection for authenticity determination, binder components and pigments that do not absorb light in the wavelength ranges corresponding to the excitation wavelength and emission wavelength of the illuminant when authenticity determination is performed are preferred, and attention must also be paid to the absorption characteristics of the photopolymerization initiator.

[0029] The type of luminescent composition is not particularly limited, and it can be used as a known ink such as offset ink, letterpress ink, flexographic ink, screen ink, gravure ink, intaglio ink, inkjet ink, coating liquid, etc. The drying or polymerization method of the varnish material is also not particularly limited, and known methods such as penetration drying, evaporation drying, oxidative polymerization, and ionizing radiation drying can be used. It can also be in the form of a toner or ribbon that can be applied by electrostatic transfer method or thermal transfer method.

[0030] (Manufacturing method) The method for producing the light-emitting composition is not particularly limited as long as it can uniformly mix the above-mentioned components. When mixing the components in the method for producing the light-emitting composition, for example, a mixer such as a planetary mixer, a tumbler, a bead mill, a sand mill, a stirrer, an agitator, a mechanical homogenizer, an ultrasonic homogenizer, a paint shaker, a V-type blender, a Nauta mixer, or a three-roll mill can be used.

[0031] (Printing method) The method for applying the luminescent composition to the substrate (1) is not particularly limited, and any known application method can be used as long as it can apply a luminescent material, such as printing, such as offset printing, letterpress printing, flexographic printing, screen printing, gravure printing, intaglio printing, or inkjet printing, electrostatic transfer, thermal transfer, or general coating including gravure coating.

[0032] (First detection means and second detection means) The first and second detection means of the present invention may have a function of receiving light emitted from an illuminant excited by light of a specific wavelength in the ultraviolet, visible, or infrared region, and displaying some kind of indication that the light has been detected. The function of indicating the detection is not particularly limited, and known indication functions such as lighting up a light, making a detection sound, displaying a numerical value, etc. may be used.

[0033] In the present invention, the second detecting means uses a sensor with higher sensitivity than the first detecting means, or the irradiation intensity of the excitation light is varied and the difference in luminescence intensity is visually confirmed.

[0034] For example, the first and second detection means may irradiate the first and second detection means with light of the same excitation wavelength but different irradiation intensities, thereby differentiating the emission intensities of the first and second discrimination regions (2) and (4), and thus detecting the first and second discrimination regions using detectors with the same detection sensitivity. Alternatively, the first and second detection means may irradiate the first and second detection means with excitation light of the same irradiation intensity and wavelength, but with a different detection sensitivity for either one of the detection means or a naked-eye observation means. Furthermore, the first and second detection means may irradiate different wavelengths of excitation light depending on the excitation characteristics of the light emitter. Here, the definition of high or low sensor sensitivity includes not only the sensitivity of the sensor itself but also the high or low detection threshold of the detection means.

[0035] The reason why the detection sensitivity of the first detection means and the second detection means is different is because the difference in luminescence intensity between the first discrimination region (2) and the second discrimination region (4), which are formed by varying at least one of the light-emitting material ratio, light-emitting material type, image area ratio, and film thickness, is detected by the first detection means, which has lower sensitivity. If the detection sensitivity of the first detection means is lower than that of the second detection means, only one of the regions can be detected, but if the detection sensitivity of the first detection means is higher than that of the second detection means, both regions can be detected. If the detection sensitivity of the first detection means and the second detection means are the same, both regions will either be detectable or not, making it difficult to distinguish between the luminescence intensities of the first discrimination region (2) and the second discrimination region (4).

[0036] When detecting luminescence by a second detection means having higher detection sensitivity than the first detection means or by visual inspection, both the first discrimination region (2) and the second discrimination region (4) can be detected. Specific examples of detecting the first discrimination region (2) by the first detection means and the first discrimination region (2) and the second discrimination region (4) by the second detection means will be described in detail in the Examples. Next, an example of using a device for the first detection means and the second detection means will be described.

[0037] For example, when a first detector (D1) is used as the first detecting means and a second detector (D2) is used as the second detecting means, the device may have the function of receiving light emitted from the light emitter and indicating that the light emission has been detected by some kind of display. Furthermore, the first detector (D1) and the second detector (D2) may not only receive light but also have the function of irradiating light of a specific wavelength in the ultraviolet, visible, or infrared region.

[0038] The detection sensitivity of the light receivers of the first detector (D1) and the second detector (D2), the wavelength of the irradiating light source, and the intensity of the irradiating light are not particularly limited as long as they are conditions that allow the light emission of the light emitter to be detected, but it is preferable to use an LED as the irradiating light source and a photodiode as the light receiver because they are inexpensive, compact, and easy to control.

[0039] The detection sensitivities of the first detector (D1) and the second detector (D2) must be different, just like the first detection means and the second detection means. It is necessary to provide a sensor with detection sensitivity that can accommodate the difference in luminescence intensity between the first discrimination region (2) and the second discrimination region (4), which can be adjusted by printing, coating, etc.

[0040] The detection sensitivity of the first detector (D1) and the second detector (D2) may be adjusted by the difference in resolution due to the number of elements per unit area of ​​the sensor, the diameter, thickness, or number of lenses that detect the emitted light, or by using sensors of different types with different light receiving sensitivities, or by setting different threshold values ​​for the received light intensity of the sensors. Alternatively, when an upconversion type light emitter is used, the laser pen emits excitation light with a high irradiation amount per unit area, so that it is possible to emit light in both regions, and therefore the second emission, which has a lower emission intensity than the first emission, can be visually confirmed.

[0041] Next, we will explain the case where an infrared detector (NKT-001A manufactured by Nemoto Specialty Chemical Co., Ltd.) is used as an example of the first detector (D1). This detector was used as an audio presence detector. The area where the first detector (D1) can detect luminescence was formed as the first discrimination area (2), and the area where the first detector (D1) cannot detect luminescence was formed as the second discrimination area (4).

[0042] (Flexo dot area ratio difference upconversion) This embodiment is an example of an authenticity-determining printed matter (A1) formed using a flexographic ink containing 10% of a first infrared emitter (IR1) as the first luminescent composition, and different dot area ratios for the first discrimination area (2) and the second discrimination area (4).

[0043] In detail, anilox rollers of 200 L / cm, 160 L / cm, 120 L / cm and 100 L / cm were used, and the first discrimination area (2) and the second discrimination area (4) were printed with different dot area ratios on high-quality paper (Shiraoi, Nippon Paper Industries Co., Ltd.) as the substrate (1).

[0044] As shown in FIG. 2, when a 200 L / cm anilox roll is used, a dot area percentage of 30% or more forms the first discrimination region (2), and a dot area percentage of 20% or less forms the second discrimination region (4). Similarly, when a 160 L / cm anilox roll is used, a dot area percentage of 20% or more forms the first discrimination region (2), and a dot area percentage of 10% or less forms the second discrimination region (4). Similarly, at 120 L / cm, a dot area percentage of 10% or more and at 100 L / cm, a dot area percentage of 5% or more forms the first discrimination region (2), and at 120 L / cm, a dot area percentage of 5% or less and at 100 L / cm, a dot area percentage of 2% or less forms the second discrimination region (4). Thus, when the same first luminescent composition is used, the first discrimination region (2) and the second discrimination region (4) can be formed depending on the dot area percentage.

[0045] (difference in offset displacement) Next, we will explain an example of an authenticity discriminating printed matter (A2) in which an offset ink containing 2% of a first infrared emitter (IR1) is used as the first luminescent composition, and the first discrimination area (2) and the second discrimination area (4) are formed by varying the amount of luminescent composition transferred to a substrate (1) of fine paper (Shiraoi, Nippon Paper Industries Co., Ltd.). The blending ratio of the first infrared emitter (IR1) in the first luminescent composition is set so that the amount transferred in offset printing cannot be detected by the first detection means, but can be detected by the first detection means when the amount transferred is about twice as much, i.e., when the printing film thickness of the first luminescent composition is about twice or more.

[0046] As shown in Figure 3, the authenticity discrimination print (A2) was formed by printing solid lines in two locations. The first discrimination area (2) was formed by overprinting the solid lines, each measuring 8 mm x 10 mm. The area that was not overprinted was formed as the second discrimination area (4).

[0047] In the above example, the first discrimination region (2) was formed by overprinting the same first luminescent composition, and the second discrimination region (4) was formed by a single printing. However, the first discrimination region (2) may also be formed by overprinting different luminescent compositions. The shapes and image area ratios of the designs in the first and second layers may also be different. Alternatively, the formulation of the first luminescent composition may be appropriately designed, and the second discrimination region (4) may be formed by overprinting.

[0048] (Offset dot area ratio, difference in blending ratio) Next, we will explain an example in which offset inks with different blending ratios of the second infrared emitter (IR2) are used as the second luminescent composition, and the first discrimination area (2) and the second discrimination area (4) are formed with different dot area ratios on the substrate (1) made of high-quality paper (Shiraoi, Nippon Paper Industries Co., Ltd.).

[0049] As shown in Figure 4, when a second luminescent composition containing 1% of infrared emitter (IR2) is used, a first discrimination region (2) is formed when the image area ratio is 40% or more, and a second discrimination region (4) is formed when the dot area ratio is 30% or less. When a second luminescent composition containing 3% of infrared emitter (IR2) is used, a first discrimination region (2) is formed when the image area ratio is 20% or more, and a second discrimination region (4) is formed when the dot area ratio is 10% or less. When a second luminescent composition containing 5% of infrared emitter (IR2) is used, a first discrimination region (2) is formed when the image area ratio is 10% or more, and a second discrimination region (4) is formed when the dot area ratio is 5% or less. On the other hand, when the entire image is formed with dots having a screen area ratio of 20%, the first discrimination area (2) can be formed by using a second luminescent composition containing 5% of infrared emitting material (IR2), and the second discrimination area (4) can be formed by using a second luminescent composition containing 1% of infrared emitting material (IR2).

[0050] (Differences in the type of offset light emitter) Next, we will explain an example in which two types of offset inks, each containing two types of infrared emitting materials (IR1 and IR3) with different luminescence intensities, were used as luminescent compositions, and a first discrimination area (2) and a second discrimination area (4) were formed by solid printing of the luminescent composition on a substrate (1) of high-quality paper (Shiraoi, Nippon Paper Industries Co., Ltd.) (not shown).

[0051] The first discrimination region (2) can be formed by solid printing a first luminescent composition containing 20% ​​of a first infrared emitter (IR1), and the second discrimination region (4) can be formed by solid printing a third luminescent composition containing 20% ​​of a third infrared emitter (IR3) having a lower luminescence intensity than the first infrared emitter (IR1).

[0052] While specific examples of the formation method have been given above to distinguish between the first discrimination region (2), which is an area where infrared emission can be detected, and the second discrimination region (4), which is an area where infrared emission cannot be detected, these may also be combined to form each region. The formation method may be selected depending on the design and cost of the authenticity discrimination print, the sensitivity of the first detector (D1) in the first detection means, etc.

[0053] (Discrimination method) Next, an example of a method for discriminating the authenticity of the printed matter (A1) of the present invention will be described, in which the first discrimination area (2) and the second discrimination area (4) formed with ink containing an illuminant that emits infrared light (hereinafter referred to as "infrared illuminant") are discriminated. Note that this discrimination method is not limited to infrared illuminants.

[0054] As shown in Fig. 5, in the first detection step (S1), it is confirmed that the infrared emission from the first discrimination region (2) can be detected by the first detection means (S1-1). Next, it is confirmed that the infrared emission from the second discrimination region (4) cannot be detected by the first detection means (S1-2). If it is confirmed that the infrared emission from the first discrimination region (2) and the infrared emission from the second discrimination region (4) can both be detected by the first detection means, it can be determined that the product is "genuine."

[0055] Here, since the above-mentioned judgment conditions may be satisfied even when an infrared illuminant is provided in the first discrimination region (2) but not in the second discrimination region (4), a second detection step (S2) can be added to make a more accurate judgment. The second detection step (S2) uses a second detection means capable of detecting both the first discrimination region (2) and the second discrimination region (4) to confirm that the infrared illuminant in the first discrimination region (2) can be detected (S2-1), and then confirm that the infrared illuminant in the second discrimination region (4) can be detected (S2-2), thereby confirming that the second discrimination region (4) also has an infrared illuminant provided.

[0056] When an upconversion type illuminant is used, it is also possible to confirm that the illuminant is also provided in the second discrimination region (4) by irradiating the region with infrared light using a laser pen as the second detection means (D2) and visually confirming the visible light emission with the naked eye. The infrared light from the laser pen has a higher irradiation amount per unit area than the infrared light from the first detection means (D1), and therefore can emit light in both regions, allowing the second emission, which has a lower emission intensity than the first emission, to be visually confirmed.

[0057] Alternatively, instead of using the first detection means (D1), the product can be identified based on the detection value of a second detector (D2) capable of displaying the detection value. When the second detector (D2) detects the first discrimination area (2), it is confirmed that the detection value is equal to or greater than a predetermined threshold. Next, it is confirmed that the detection value of the second discrimination area (4) is greater than 0 and less than the predetermined threshold. If both values ​​are within the predetermined reference value range, the product is determined to be "genuine."

[0058] (Example) Next, examples of the present invention will be described, but the embodiments of the present invention are not limited to these examples.

[0059] In the following examples, in the case of UV inks using UV varnish, the ink was cured with ultraviolet light using a metal halide lamp after printing, and in the case of water-based inks using water-soluble resins, the ink was allowed to evaporate and dry at room temperature for at least one day.

[0060] Unless otherwise specified, the first detection means used an infrared detector (detector NKT-001A manufactured by Nemoto Special Chemical Co., Ltd.) as the first detector (D1), and the second detection means used a laser pen capable of emitting 980 nm laser light, and observation was performed with the naked eye.

[0061] First, the materials shown in Tables 1 to 6 were mixed using a three-roll mill (Buhler SDY-300) to prepare first infrared luminescent offset inks (J1, J2, J3-1, J4, J5-1, J6-1) and second infrared luminescent offset inks (J3-2, 5-2, J6-2).

[0062] [Table 1]

[0063] [Table 2]

[0064] [Table 3]

[0065] [Table 4]

[0066] [Table 5]

[0067] [Table 6]

[0068] (Examples 1 to 6) Next, using each of the prepared infrared-emitting offset compositions (J1, J2, J3, J4, J5, J6), authenticity-determining printed materials (A1, A2, A3) of Examples 1 to 6 shown in Table 7 were prepared using an offset proofing machine (HP-60 model, manufactured by Shimogasaki Iron Works Co., Ltd.).

[0069] Example 1 used the configuration shown in Fig. 1. Examples 2, 3, and 6 used the configuration shown in Fig. 6, and in particular, Example 2 had a guideline (5) for the detector installation position printed in light blue ink so as to surround the second discrimination area (4). Examples 4 and 5 used the configuration shown in Fig. 3.

[0070] [Table 7]

[0071] Next, the infrared emission of the first discrimination area (2) and the second discrimination area (4) of the authenticity discriminant printed materials (A1, A2, A3) was detected using a first detector (D1) as the first detection means and 980 nm laser light was irradiated from a laser pen as the second detection means. The detection results are shown in Table 8.

[0072] [Table 8]

[0073] In the authenticity discriminant printed materials (A1, A2, A3), the first detector (D1) was able to detect infrared luminescence from the first discrimination area (2), but not from the second discrimination area (4).

[0074] In addition, as a second detection method, 980 nm laser light was irradiated using a laser pen. However, green light emission was observed from both the first discrimination area (2) and the second discrimination area (4). Therefore, the judgment conditions were met, that is, the first detector (D1) can detect only the first discrimination area (2), and the second detection means can detect both the first discrimination area (2) and the second discrimination area (4). Therefore, it was confirmed that the authenticity-distinguishing printed matters (A1, A2, A3) of Examples 1, 2, 4, 5, and 6 were "genuine."

[0075] For the authenticity discriminating printed matter (A3) of Example 3, the results of using an infrared detector (NKC-10 manufactured by Nemoto Specialty Chemical Co., Ltd.) as the second detection means, which is a second detector (D2) that has higher detection sensitivity than the first detector (D1) and displays the detection value as a number, are shown in Table 9.

[0076] [Table 9]

[0077] The first discrimination area (2) on the authenticity discriminant printed matter (A3) was measured using the second detector (D2), an infrared detector (NKC-10 manufactured by Nemoto Specialty Chemical Co., Ltd.), resulting in a detection value of "13." Similarly, the second discrimination area (4) resulted in a detection value of "2." Since the first detection means detected only the infrared emission of the first discrimination area (2), and the second detection means detected both the first discrimination area (2) and the second discrimination area (4), satisfying the judgment conditions, it was possible to confirm that the authenticity discriminant printed matter (A3) of Example 3 was "genuine."

[0078] Next, examples in which the compositions were prepared as flexographic inks will be described. The materials shown in Tables 10 and 11 were mixed and stirred in a TK Homodisper (manufactured by Tokushu Kika Kogyo Co., Ltd.) to prepare first infrared-emitting flexographic inks (J7 and J8).

[0079] [Table 10]

[0080] [Table 11]

[0081] (Examples 7 and 8) Next, using each of the prepared infrared emitting flexographic inks (J7, J8), authenticity discriminating prints (A3) of Examples 7 and 8 shown in Table 12 were prepared using a Flexiproof 100UV (RK Print Coat Instruments). Note that for Examples 7 and 8, the form shown in Figure 6 was used.

[0082] [Table 12]

[0083] Next, the infrared emission of the first discrimination area (2) and the second discrimination area (4) of the authenticity discriminant printed matter (A3) was measured using a first detector (D1) as the first detection means and irradiated with 980 nm laser light from a laser pen as the second detection means. The results are shown in Table 13.

[0084] [Table 13]

[0085] In the authenticity discrimination printed matter (A3) of Examples 7 and 8, infrared luminescence from the first discrimination area (2) could be detected using the first detector (D1), but infrared luminescence from the second discrimination area (4) was not detected.

[0086] Furthermore, when 980 nm laser light was applied as the second detection means to the authenticity discriminant printed matter (A3) of Example 7, green light emission was observed from both the first discrimination area (2) and the second discrimination area (4). Therefore, the judgment conditions were met, that is, the first detector (D1) can detect only the first discrimination area (2), and the second detection means can detect both the first discrimination area (2) and the second discrimination area (4), and therefore it was confirmed that the authenticity discriminant printed matter (A3) of Example 7 is "genuine."

[0087] In addition, for the authenticity discriminating printed matter (A3) of Example 8, the second detection means was a second detector (D2) that displays the detection value, and the results of measurement using an infrared detector (NKC-10 manufactured by Nemoto Specialty Chemical Co., Ltd.) are shown in Table 14.

[0088] [Table 14]

[0089] The first discrimination area (2) on the authenticity discriminant printed matter (A3) of Example 8 was measured using an infrared detector (NKC-10 manufactured by Nemoto Specialty Chemical Co., Ltd.) as the second detector (D2) that displays the detection value as the second detection means, resulting in a detection value of "4." Similarly, the second discrimination area (4) obtained a detection value of "2." The second discrimination area (4), which was not detected by the first detector (D1), also obtained a detection value with the second detector (D2), confirming that infrared-emitting ink was applied. Since the judgment conditions were met, that is, the first detection means detected only the infrared emission of the first discrimination area (2), and the second detection means detected both the first discrimination area (2) and the second discrimination area (4), the authenticity discriminant printed matter (A3) of Example 8 was confirmed to be "genuine."

[0090] Next, an example in which the composition was prepared as gravure ink will be described. The materials shown in Table 15 were mixed and stirred in a TK Homodisper (manufactured by Tokushu Kika Kogyo Co., Ltd.) to prepare a first infrared-emitting gravure ink (J9).

[0091] [Table 15]

[0092] Example 9 Next, the prepared first infrared luminescent gravure ink (J9) was used to prepare an authenticity discriminating print (A3) shown in Table 16 using an electric gravure printing tester (manufactured by Kurabo Industries, Ltd.). In Example 9, the configuration shown in Figure 6 was used.

[0093] In the authenticity discriminant printed matter (A3), the infrared luminescence of the first discrimination area (2) could be detected using the first detector (D1), but the infrared luminescence of the second discrimination area (4) was not detected.

[0094] For the authenticity discriminant printed matter (A3), the second detection means was a second detector (D2) that displays the detection value, and the results of measurement using an infrared detector (NKC-10 manufactured by Nemoto Specialty Chemical Co., Ltd.) are shown in Table 16.

[0095] [Table 16]

[0096] The first discrimination area (2) of the authenticity discriminant printed matter (A3) of Example 9 was measured using the NKC-10 detector manufactured by Nemoto Specialty Chemical Co., Ltd. as the second detection means, which is the second detector (D2) that displays the detection value, and the result was a detection value of "13." Similarly, the second discrimination area (4) obtained a detection value of "2." Since the first detection means detected only the infrared emission of the first discrimination area (2) and the second detection means could detect both the first discrimination area (2) and the second discrimination area (4), satisfying the judgment conditions, it was possible to confirm that the authenticity discriminant printed matter (A3) was "genuine."

[0097] (Comparative Example) The authenticity determination print was printed in solid ink using an offset printing machine using infrared luminescent offset ink (J1). The authenticity determination print did not have a second discrimination area (4) and luminescence was detected in every area by the first detector (D1), so it was determined to be a counterfeit. [Explanation of symbols]

[0098] A1, A2, A3 Authenticity printed matter 1 Base material 2. First discrimination region 3. Specific information 4. Second discrimination region 5 Guideline

Claims

1. An authenticity discriminant printed matter, in which two discrimination regions having different luminescence intensities are formed, and when irradiated with excitation light in a predetermined wavelength range, a first luminescence can be detected by a first detection means, and both the first luminescence and the second luminescence can be detected by irradiation with laser light having an irradiation intensity higher than that of the excitation light of the first detection means, or by a second detection means which is a detector having a higher detection sensitivity than that of the detector of the first detection means, An authenticity-discriminating printed matter characterized by having, on at least a portion of a substrate, a first discrimination area which, when irradiated with the excitation light, emits a first emission in a predetermined wavelength range different from that of the excitation light, and a second discrimination area which emits a second emission having a lower emission intensity than the first emission by differing from the first discrimination area in at least one of the image area ratio, the composition ratio of the luminescent material, and the film thickness.

2. 2. A method for determining the authenticity of an authenticity-determining printed matter according to claim 1, comprising: a first detection step of irradiating the first discrimination region and the second discrimination region with the excitation light and detecting only the first luminescence by the first detection means; a second detection step of irradiating the first discrimination region and the second discrimination region with the excitation light and detecting the first luminescence and the second luminescence by the second detection means; A method for determining authenticity, characterized in that the first light emission is detected in the first detection step, and the product is determined to be authentic if both the first light emission and the second light emission are detected in the second detection step.

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