Authentication printed material and authentication method

Abstract

To provide a printed matter capable of performing authenticity verification with high accuracy by mechanical verification, by excluding imitation by imparting any infrared emitter high in confidentiality of an infrared phosphor that is a discrimination element.SOLUTION: An authentication printed matter has, on at least a part of a substrate, a printed pattern comprising a first verification region exhibiting a first emission and a second verification region exhibiting a second emission with an emission intensity lower than that of the first emission. The second verification region is constituted by a second emission-absorbing layer formed from a second ink containing a second colorant having absorption properties to both excitation light and the emission of the luminescent printing layer, and a luminescent printing layer formed from a luminescent ink stacked thereon. The first verification region is constituted by a luminescent printing layer formed from a luminescent ink and a first emission-absorbing layer stacked thereon, the first emission-absorbing layer being formed from a first ink containing a first colorant having absorption properties to the excitation light and the emission of the luminescent printing layer that are lower than those of the second colorant.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 anti-counterfeiting 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 used in combination with other coloring pigments, the presence of the emitting material is concealed, making it difficult to know that an infrared emitting material has been added, making it difficult to accurately counterfeit or alter the product.

[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 is made on a transfer target material, which is 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 recording material, and the authenticity of the anti-counterfeit printed matter is determined by detecting it with an infrared detection detector with detection conditions 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 material, 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 material has been added, there is a risk that a counterfeit product that can be detected by an infrared detection detector can be produced by obtaining the infrared fluorescent material and adding a certain amount or more of the infrared fluorescent material 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 provides an authenticity discriminating printed matter having, at least in part on a substrate, a printed pattern including a first discrimination region that emits a first light emission formed by luminescent ink containing a luminous body that emits light in a predetermined wavelength range different from the excitation light when exposed to excitation light in that wavelength range, and a second discrimination region that emits a second light emission with a lower emission intensity than the first light emission, and the authenticity discriminating printed matter is based on the light emission of the first discrimination region and the second discrimination region when exposed to excitation light, and the second discrimination region is formed by a luminescent printing layer formed by luminescent ink and a second color material that is absorbent to the excitation light and the light emitted by the luminescent printing layer. the first discrimination area is characterized in that it is composed of a laminate of a luminescent printing layer formed from the luminescent ink and a first luminescent absorbing layer formed from a first ink containing a first color material whose absorbency to excitation light and the emission of the luminescent printing layer is lower than that of the second color material, or a third luminescent absorbing layer formed from a third ink containing a luminescent body and the first color material.

[0010] The present invention is an authenticity-discriminating printed matter having a printed pattern on at least a portion of a substrate that is reflective to the excitation light and the emission of the luminescent printing layer, the printed pattern comprising a first discrimination area that emits a first emission formed from luminescent ink containing an illuminant that emits emission in a predetermined wavelength range different from the excitation light when exposed to excitation light in that wavelength range, and a second discrimination area that emits a second emission having a lower emission intensity than the first emission, and the authenticity is discriminated based on the emission of the first discrimination area and the second discrimination area when exposed to excitation light, wherein the second discrimination area is composed of a luminescent printing layer formed from the luminescent ink and a second emission-absorbing layer formed from a second ink containing a second coloring material that is absorbent to the excitation light and the emission of the luminescent printing layer, laminated together, or a fourth emission-absorbing layer formed from a fourth ink containing the luminant and the second coloring material, and the first discrimination area is composed of a luminescent printing layer formed from luminescent ink laminated on the substrate.

[0011] The present invention is an authenticity-discriminating printed matter having a printed pattern on at least a portion of a substrate that is absorbent to the excitation light and the emission of the luminescent printing layer, the printed pattern comprising a first discrimination area that emits a first emission formed from luminescent ink containing an illuminant that emits emission in a predetermined wavelength range different from the excitation light when exposed to excitation light in that wavelength range, and a second discrimination area that emits a second emission having a lower emission intensity than the first emission, and the authenticity is discriminated based on the emission of the first discrimination area and the second discrimination area when exposed to excitation light, wherein the second discrimination area is formed by laminating a luminescent printing layer formed from the luminescent ink on the substrate, and the first discrimination area is formed by laminating a luminescent printing layer formed from the luminescent ink and a fifth emission-absorbing layer formed from a fifth ink containing a third colorant that has a lower absorbency to the excitation light and the emission of the luminescent printing layer than the substrate, or the authenticity-discriminating printed matter is characterized in that it comprises a sixth emission-absorbing layer formed from a sixth ink containing the luminant and the third colorant.

[0012] The present invention is a method for determining the authenticity of an authenticity discriminant printed matter, characterized by 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 determining that the matter is authentic if the first emission is detected in the first detection step and the first emission and the second emission are detected in the second detection step. [Effects of the Invention]

[0013] 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]

[0014] [Figure 1] FIG. 1 shows an example of an authenticity discriminant printed matter (A1) of the present invention. [Figure 2] FIG. 1 is an example showing the authenticity determination method of the present invention. [Figure 3] FIG. 1 shows an example of an authenticity discriminant printed matter (A2) of the present invention. [Figure 4] FIG. 1 shows an example of an authenticity discriminant printed matter (A3) of the present invention. [Figure 5] FIG. 1 shows an example of an authenticity discriminant printed matter (A4) of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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 fall within the scope of the technical idea described in the claims.

[0016] (First embodiment) Figure 1 shows an authenticity discrimination printed matter (A1) according to a first embodiment. Figure 1(a) is a plan view of the authenticity discrimination printed matter (A1), which has a printed pattern on at least a portion of a substrate (1) that includes a first discrimination region (2) that emits a first light emission and a second discrimination region (4) that emits a second light emission. Figure 1(b) is an AA' cross-sectional view of the authenticity discrimination printed matter (A1), which shows that the first discrimination region (2) is made of a light-emitting printed layer (7) laminated on a first light-emitting absorption layer (5), and the second discrimination region (4) is made of a light-emitting printed layer (7) laminated on a second light-emitting absorption layer (6).

[0017] In the cross-sectional view of Figure 1(b), the luminescent printed layer (7) is laminated on the first luminescent absorption layer (5) and the second luminescent absorption layer (6), but the luminescent printed layer (7) may be laminated below the first luminescent absorption layer (5) and the second luminescent absorption layer (6). Furthermore, the first luminescent absorption layer (5) and the second luminescent absorption layer (6) may have any size and shape as long as they at least partially overlap with the luminescent printed layer (7).

[0018] In addition, the margins of the substrate (1) other than the first discrimination area (2) and the second discrimination area (4) may have additional information (3) such as numbers, letters, or photographs, and if it does not affect the light emission of the first discrimination area (2) and the second discrimination area (4), part of the additional information (3) may be laminated on the first discrimination area (2) and the second discrimination area (4).

[0019] (luminescent printing layer) The light-emitting printed layer (7) is formed from a light-emitting ink containing a light-emitting material that emits light in a predetermined wavelength range different from the excitation light when excited by excitation light in a predetermined wavelength range. The type of light-emitting material is not particularly limited, and any known light-emitting material can be used. The excitation light and emitted light may be in the ultraviolet, visible, or infrared range.

[0020] The light emitter used in the present invention may be one type or a mixture of two or more types. Also included are upconversion materials, which are light emitters that absorb near-infrared light and emit visible light. Examples of light emitters are listed below.

[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 , (Lu,Yb,Nd)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 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、 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 sCa(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, NaY 0.69 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 type), near-infrared fluorescent dyes (Cosmobio Co., Ltd.), aminobenzopyranoxanthene dyes (ABPX), Donor-Acceptor-Donor (dAd) type 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] (First light-emitting absorption layer and second light-emitting absorption layer) The second emission-absorbing layer (6) is formed of a second ink containing a second coloring material that absorbs excitation light in a predetermined wavelength range and emission in a predetermined wavelength range from the light emitter in the emission-emitting printed layer (7). The first emission-absorbing layer (5) is formed of a first ink containing a first coloring material that absorbs excitation light in a predetermined wavelength range and emission in a predetermined wavelength range less than the second coloring material. In this specification, the term "lower absorption of the first coloring material than the second coloring material" refers to any material that provides the same effect when checking the emission intensity of the first discrimination region (2) and the second discrimination region (4), as described below. The first coloring material may be transparent or reflective to excitation light in a predetermined wavelength range and emission in a predetermined wavelength range from the light emitter in the emission-emitting printed layer (7). For example, the first emission-absorbing layer (5) may be formed of a reflective layer using a metallic pigment as the first coloring material, or an ink containing a metallic pigment may be used as the third ink, as described below.

[0024] (First colorant and second colorant) The first color material and the second color material are selected according to the wavelength of the excitation light and the emission wavelength of the illuminant forming the luminescent printed layer (7).

[0025] For example, when the light-emitting printed layer (7) is formed of an infrared-excited infrared light emitter or a visible-light-excited infrared light emitter, the first coloring material of the first light-emitting / absorbing layer (5) is a normal C (cyan), M (magenta), or Y (yellow) pigment that does not have infrared absorption properties, and the second coloring material of the second light-emitting / absorbing layer (6) is carbon black, conductive zinc oxide, or the like, that has infrared absorption properties.

[0026] Furthermore, when the light-emitting printed layer (7) is formed using an ultraviolet-excited visible light-emitting material, the first coloring material of the first light-emitting absorption layer (5) is silicon oxide, barium sulfate, or the like, which has low absorption of excitation light in ultraviolet wavelengths and visible light emission. The second coloring material of the second light-emitting absorption layer (6) is titanium dioxide or zinc oxide, which has high absorption characteristics for ultraviolet wavelengths, and a pigment of a hue that is highly absorbent for visible light emission. Examples of pigments with a hue that is highly absorbent for visible light emission include blue-green, green, and black pigments when the emitted color is red; blue-purple, purple, green, and black pigments when the emitted color is green; and yellow, orange, and black pigments when the emitted color is blue.

[0027] Furthermore, when the light-emitting print layer (7) is formed with a light-emitting ink containing an upconversion light-emitting material (infrared-excited visible light-emitting material), the first coloring material of the first light-emitting absorption layer (5) is a normal C (cyan), M (magenta), or Y (yellow) pigment that does not have infrared absorption properties. Furthermore, the second coloring material of the second light-emitting absorption layer (6) can be carbon black, conductive zinc oxide, naphthalocyanine dyes, or the like, which have high absorption of excitation light and emission in a predetermined wavelength range. Table 1 shows examples of combinations of methods for forming a first light-emitting absorption layer (5) with low absorption of excitation light and emission in a predetermined wavelength range and a second light-emitting absorption layer (6) with high absorption of excitation light and emission in a predetermined wavelength range.

[0028] [Table 1]

[0029] There is no absolute numerical standard for whether the absorbance of the first luminescence absorption layer (5) or the second luminescence absorption layer (6) is low or high. The absorbance may be adjusted in accordance with the detection sensitivity of the first detection means, which will be described later, so that the first luminescence in the first discrimination region (2) can be detected by the first detection means, but the second luminescence in the second discrimination region (4) cannot be detected by the first detection means.

[0030] (Ink) Next, the luminescent ink forming the luminescent printed layer (7), the first ink forming the first luminescent absorbing layer (5), and the second ink forming the second luminescent absorbing layer (6) will be described. The luminescent ink consists of at least the luminescent material and binder component described above, while the first ink and second ink consist of at least the colorant and binder component described above. Depending on the binder, various adjusting agents such as photopolymerization initiators, driers, and other auxiliary agents, dispersants, gelling agents, surfactants, and lubricants may be blended. Note that while the formation of the luminescent printed layer (7), the first luminescent absorbing layer (5), and the second luminescent absorbing layer (6) has been described using ink as an example, the form of the composition forming each layer is not particularly limited and can take any known form, such as toner or coating liquid.

[0031] (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 oleinamide; 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.

[0032] (auxiliary agent / adjuster) Examples of auxiliary and adjuster agents 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; oil-soluble carboxylic acids such as naphthenic acid, octylic acid, resin acid, and tall oil fatty acid; and salts of resin acids of polyvalent metals such as cobalt, manganese, cerium, zirconium, lead, iron, zinc, copper, vanadium, barium, and calcium.

[0033] 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.

[0034] 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.

[0035] 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, silicon oxide, etc. may be blended within the range that does not inhibit the light emission of the light-emitting body or the absorption of various coloring materials. 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 light-emitting body when authenticity determination is performed are preferred, and attention must also be paid to the absorption characteristics of the photopolymerization initiator.

[0036] The types of the luminescent ink, first ink, and second ink are not particularly limited, and known inks such as offset ink, letterpress ink, flexographic ink, screen ink, gravure ink, intaglio ink, inkjet ink, and coating liquid can be used. 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. The inks can also be in the form of toners or ribbons that can be applied by electrostatic transfer methods or thermal transfer methods.

[0037] (Manufacturing method) The manufacturing method of the luminescent ink, the first ink, and the second ink is not particularly limited as long as it is a manufacturing method that can uniformly mix the above-mentioned components. When mixing the components, 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.

[0038] (Printing method) The method for applying the luminescent ink, the first ink, and the second ink to the substrate (1) is not particularly limited, and any known application method can be used as long as it can apply the luminescent ink, the first ink, and the second ink, such as printing such as offset printing, letterpress printing, flexographic printing, screen printing, gravure printing, intaglio printing, inkjet printing, electrostatic transfer, thermal transfer, and general coating including gravure coating.

[0039] (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 detection means, and the second discrimination region (4) is a region where the second luminescence can be detected only by the second detection means, and where the second luminescence cannot be detected by the first detection means.

[0040] The first and second discrimination regions (2) and (4) emit the first and second emissions in the same wavelength range due to differences in the excitation light and emission absorbance of the light emitters contained in the first and second discrimination regions (5) and (6). However, their emission intensities are different. Specifically, the second discrimination region (6) absorbs the excitation light and emission more efficiently than the first discrimination region (5), and the second discrimination region (4) absorbs and attenuates the emission from the light-emitting printed layer (7), resulting in the second discrimination region (4). On the other hand, the first discrimination region (5) absorbs the excitation light and emission less efficiently, resulting in the first discrimination region (4) emits the first discrimination region (4) with less attenuation of the emission from the light-emitting printed layer (7). Because the first discrimination region (2) and the second discrimination region (4) detect the emission characteristics of each region to determine authenticity, their colors when observed with the naked eye are not particularly limited and may be identical or different colors.

[0041] Furthermore, in this embodiment, the first discrimination region (2) and the second discrimination region (4) are positioned adjacent to each other, but they may also be positioned apart.

[0042] (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 ultraviolet light, visible light, or infrared light of a specific wavelength, and displaying some kind of indication that the light emission has been detected. The function of displaying the detection is not particularly limited, and known display functions such as lighting up a light, making a detection sound, displaying a numerical value, etc. may be used.

[0043] 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.

[0044] 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 detection 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. Alternatively, the first and second detection means may irradiate the first and second detection means with excitation light of different wavelengths depending on the excitation characteristics of the light emitter. In this application, 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.

[0045] 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 the first luminescence absorption layer (5) and the second luminescence absorption layer (6), respectively, 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).

[0046] Furthermore, the first detection means and the second detection means may not only receive light but also have the function of irradiating light of a specific wavelength such as ultraviolet light, visible light, or infrared light. Furthermore, the function of displaying the detection is not particularly limited, and known display functions such as lighting up a light, sound detection, numerical display, etc. can be used.

[0047] The detection sensitivity of the light receivers of the first detection means and the second detection means, 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-emitting body 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.

[0048] The first and second detection means must have different detection sensitivities, and the sensors must have detection sensitivities that can accommodate the difference in luminescence intensity between the first and second discrimination areas (2) and (4), which can be adjusted by printing, coating, etc.

[0049] The detection sensitivity of the first detection means and the second detection means 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 intensity of the received light of the sensors. Alternatively, when an upconversion type light emitter is used, the amount of irradiation per unit area of ​​the excitation light from the laser pen is high, so that light emission in both regions can be achieved, and the second emission, which has a lower emission intensity than the first emission, can be visually confirmed.

[0050] (Discrimination method) Next, an example of a method for discriminating an authenticity discrimination printed matter (A1) of the present invention shown in FIG. 1 will be described. Here, an example will be described in which the light-emitting printed layer (7) of the authenticity discrimination printed matter (A1) of the present invention shown in FIG. 1 is formed from an infrared light-emitting ink containing an illuminant that emits infrared light (hereinafter referred to as an "infrared illuminant"). The first light-emitting / absorbing layer (5) is formed from an infrared-absorbing ink, and the second light-emitting / absorbing layer (6) is formed from a second ink that has high infrared absorption properties compared to the first ink. The first light-emitting / absorbing layer (5) and the second light-emitting / absorbing layer (6) are laminated under the light-emitting printed layer (7) to form the first discrimination region (2) and the second discrimination region (4). It should be noted that in the method for discriminating an authenticity discrimination printed matter (A1) of the present invention, the illuminant used in the authenticity discrimination printed matter (A1) is not limited to an infrared illuminant.

[0051] As shown in Fig. 2, 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."

[0052] Here, because the above-mentioned judgment conditions may be satisfied even when an infrared emitter is applied to the first light-emitting absorption layer (5) of the first discrimination region (2) and an infrared emitter is not applied to the second light-emitting absorption layer (6) of the second discrimination region (4), a second detection step (S2) is 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 emission of the first discrimination region (2) can be detected (S2-1), and then confirm that the infrared emission of the second discrimination region (4) can be detected (S2-2), thereby confirming that the second discrimination region (4) also has an infrared emitter applied.

[0053] 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 from a laser pen as the second detection means 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, and therefore can emit light in both regions, allowing the second light emission, which has a lower emission intensity than the first light emission, to be visually confirmed.

[0054] (Second embodiment) In addition, as a second embodiment that exhibits the same effect as the first embodiment, as shown in Figure 3, an authenticity discrimination printed matter (A2) can be formed by forming a third luminescence absorption layer (8) in the first discrimination area (2') using a third ink that is a mixture of the first color material for forming the first luminescence absorption layer (5) described in the first embodiment and the luminous material that forms the luminous printed layer (7), and forming a fourth luminescence absorption layer (9) in the second discrimination area (4') using a fourth ink that is a mixture of the second color material for forming the second luminescence absorption layer (6) described in the first embodiment and the luminous material that forms the luminous printed layer (7).

[0055] Alternatively, as a modified example, the first discrimination area (2') may be formed by laminating the first luminescence absorbing layer (5) and the luminescent printed layer (7) described in the first embodiment, and the second discrimination area (4') may be formed as a fourth luminescence absorbing layer (9) using a fourth ink.

[0056] (Third embodiment) Next, as a third embodiment that exhibits the same effects as the first embodiment, we will explain an authenticity discriminating printed matter (A3) in which a first luminescence absorption layer (5") and a second luminescence absorption layer (6") are formed using the characteristics of the substrate (1") itself. Note that similarities to the first embodiment will be omitted and only the differences will be explained.

[0057] As shown in Figure 4, if the substrate (1") is white or reflects infrared wavelengths, which are excitation light or emission wavelengths, the substrate (1") itself is used in place of the first emission-absorbing layer (5"), and the second emission-absorbing layer (6") is formed from a second ink containing a second colorant such as carbon black or conductive zinc oxide, which has absorption properties at infrared wavelengths, and a luminescent printed layer (7") is laminated on the substrate (1") and the second emission-absorbing layer (6") to form the authenticity discriminating printed matter (A3). Note that the first emission-absorbing layer (5") may be formed in the first discrimination region (2") from ink containing a metal pigment to improve emission intensity.

[0058] Furthermore, in this embodiment, the entire substrate (1'') is described as reflecting infrared wavelengths that are excitation light or emission wavelengths, but a part of the substrate (1'') may have an area that reflects infrared wavelengths that are excitation light or emission wavelengths, and a printed pattern may be formed in that area.

[0059] (Fourth embodiment) Next, a fourth embodiment will be described, which has the same effect as the first embodiment, in which the base material (1''') itself has an absorption characteristic.

[0060] As shown in FIG. 5, when the substrate (1''') itself is black or has the ability to absorb the specified excitation light or infrared wavelength, which is the emission wavelength, the substrate (1''') itself is used as the second emission-absorbing layer (6'''), and a luminescent printed layer (7''') is laminated on the substrate (1''') to form the second discrimination region (4'''). On the other hand, the first discrimination region (2''') may be formed by laminating a luminescent printed layer (7''') formed with a luminescent ink and a fifth emission-absorbing layer (10) formed with a fifth ink containing a metal composite oxide-based infrared-reflective pigment as a third color material having lower absorption properties for the excitation light and the emission of the luminescent material than the substrate (1'''), to form an authenticity discriminating printed matter (A4). The first discrimination region (2''') may also be formed as a sixth emission-absorbing layer using a sixth ink containing the luminescent material and the third color material.

[0061] In addition, in this embodiment, the base material (1''') is described as being entirely black or having an infrared wavelength absorbing property which is a predetermined excitation light or emission wavelength, but a part of the base material (1''') may have an area which is black or has an infrared wavelength absorbing property which is a predetermined excitation light or emission wavelength, and a printed pattern may be formed in that area.

[0062] Next, examples of the present invention will be described, but the embodiments of the present invention are not limited to these examples.

[0063] Example 1 As Example 1, an authenticity discriminated print (A1) will be described with reference to FIG. 1, as in the first embodiment.

[0064] First, a first ink having a concentration of 11% cyan, 1% magenta, and 13% yellow was used as a first colorant on a high-quality paper (Shiraoi, manufactured by Nippon Paper Industries Co., Ltd.) using cyan, magenta, and yellow pigments as the first colorant, and a first luminescence-absorbing layer (5) as shown in FIG. 1 was formed with an area ratio of 100% using a digital printing machine. Next, a second ink of the same color as the first ink was prepared using cesium tungsten oxide as the second colorant according to the formulation shown in Table 2, and a second luminescence-absorbing layer (6) as shown in FIG. 1 was formed with an area ratio of 100% using an offset proofing machine (HP-60 manufactured by Shimogaki Iron Works Co., Ltd.). The first luminescence-absorbing layer (5) and the second luminescence-absorbing layer (6) were nearly identical in color, but the reflectance of the first luminescence-absorbing layer (5) was 80.0% from 850 nm to 1000 nm and 70.3% from 500 nm to 660 nm. The reflectance of the second light-absorbing layer (6) in FIG. 1 was 32.9% in the range of 800 nm to 1000 nm, and 64.2% in the range of 500 nm to 660 nm.

[0065] [Table 2]

[0066] Infrared-emitting offset ink (J1) was prepared as a luminescent ink using a three-roll mill (Buhler SDY-300) using 5% infrared-excited visible light emitter (Nemoto Specialty Chemical Co., Ltd. ASG-010-AA), 15% infrared-excited visible light emitter (CakLi2(Yb1-x,Rex)2(WO4)k+4), 75.5% UV offset varnish, and 4.5% photopolymerization initiator 2-dimethylamino-2-(4-methyl-benzyl)-1-(4-morpholin-4-yl-phenyl)-butan-1-one.

[0067] Next, using an infrared luminescent offset ink (J1), an offset printing was performed using an offset proofing machine (HP-60 model manufactured by Shimogasaki Iron Works Co., Ltd.) to laminate the luminescent printing layer (7) on both the first luminescent absorption layer (5) and the second luminescent absorption layer (6), thereby forming a first discrimination area (2) and a second discrimination area (4), and an authenticity discrimination printed matter (A1) was produced.

[0068] An infrared detector (NKT-001A manufactured by Nemoto Special Chemical Co., Ltd.) was used as the first detection means to detect the first discrimination region (2), and the first luminescence, infrared luminescence, was detected, but the second luminescence, infrared luminescence, of the second discrimination region (4) was not detected.

[0069] Next, when a 980 nm laser beam was irradiated onto the first discrimination area (2) on the authenticity discriminant printed matter (A1) using a laser pointer as a second detection means, green light emission was visually observed. Similarly, green light emission was also observed in the second discrimination area (4). Since only the first discrimination area (2) could be detected using the first detection means, and the infrared light of the first discrimination area (2) and the second discrimination area (4) could be detected using the second detection means, the judgment criteria were met, and it was confirmed that the authenticity discriminant printed matter (A1) was "genuine."

[0070] Example 2 Next, as in the third embodiment, an authenticity discriminating printed matter (A3) will be described using FIG. 4 as Example 2. An example will be described in which the substrate (1") itself is formed as the first light-emitting absorption layer (5"). A second light-emitting absorption layer (6") was formed on the substrate (1"), which is white tack paper, using a digital printing machine and black toner as the second ink. Next, an offset proofing machine (HP-60 model, manufactured by Shimogaki Iron Works Co., Ltd.) was used to solid-print an infrared light-emitting offset ink (J1) onto the entire substrate (1"), including the second light-emitting absorption layer (6"), to form a light-emitting printed layer (7"), producing the authenticity discriminating printed matter (A3) shown in FIG. 4. The first discrimination region (2") is formed by laminating the light-emitting printed layer (7") on the substrate (1") itself, and the second discrimination region (4") is formed by laminating the light-emitting printed layer (7") on the second light-emitting absorption layer (6") formed with black toner.

[0071] An infrared detector (NKT-001A manufactured by Nemoto Specialty Chemical Co., Ltd.) was used as the first detection means. When the first discrimination area (2") was detected, infrared light emission, which is the first light emission, was detected. Next, the black printed portion, which is the second discrimination area (4"), was detected in the same way, but infrared light emission, which is the second light emission, was not detected.

[0072] Next, when a 980 nm laser beam was irradiated onto the first discrimination area (2") on the authenticity discriminant printed matter (A3) as a second detection means, green light emission was visually observed. Similarly, green light emission was also observed in the second discrimination area (4"). This satisfied the judgment conditions that only the first discrimination area (2") could be detected by the first detection means, and both the first discrimination area (2") and the second discrimination area (4") could be detected by the second detection means, thereby confirming that the authenticity discriminant printed matter (A3) was "genuine." [Explanation of symbols]

[0073] A1, A2, A3, A4 Authenticity printed matter 1, 1´, 1´´, 1´´´ Base material 2, 2´, 2´´, 2´´´ First discrimination region 3 Additional information 4, 4´, 4´´, 4´´´ Second discrimination region 5, 5´´ First light-emitting absorption layer 6, 6´´, 6´´´ Second light-emitting absorption layer 7, 7´´, 7´´´ Luminous printing layer 8 Third light-emitting / absorbing layer 9. Fourth light-emitting / absorbing layer 10 Fifth light-emitting absorption layer

Claims

1. An authenticity discrimination printed matter having, on at least a portion of a substrate, a printed pattern including a first discrimination region that emits a first light emission formed by luminescent ink containing a luminous body that emits light in a predetermined wavelength range different from the excitation light when exposed to the excitation light in the predetermined wavelength range, and a second discrimination region that emits a second light emission having a lower light emission intensity than the first light emission, and the authenticity discrimination printed matter is made based on the light emissions of the first discrimination region and the second discrimination region when exposed to the excitation light, the second discrimination area is formed by laminating a light-emitting print layer formed by the light-emitting ink and a second light-emitting absorption layer formed by a second ink containing a second color material that is absorbent to the excitation light and the light emitted from the light-emitting print layer, or is formed by a fourth light-emitting absorption layer formed by a fourth ink containing the light-emitting body and the second color material, The authenticity-discriminating printed matter is characterized in that the first discrimination area is composed of a laminate of an luminescent printing layer formed from the luminescent ink and a first luminescent absorption layer formed from a first ink containing a first color material that has lower absorbency for the excitation light and the luminescence of the luminescent printing layer than the second color material, or a third luminescent absorption layer formed from the luminescent body and a third ink containing the first color material.

2. an authenticity discrimination printed matter having a printed pattern on at least a part of a substrate that is reflective to the excitation light and the light emitted by the illuminant, the printed pattern comprising a first discrimination region that emits a first light emission formed by luminescent ink containing a luminescent body that emits light in a predetermined wavelength range different from the excitation light when exposed to the excitation light, and a second discrimination region that emits a second light emission having a lower light emission intensity than the first light emission; and the printed pattern having a printed pattern on at least a part of a substrate that is reflective to the excitation light and the light emitted by the luminescent body, the authenticity discrimination printed matter being capable of discriminating authenticity based on the light emissions of the first discrimination region and the second discrimination region when exposed to the excitation light, the second discrimination area is formed by laminating a light-emitting print layer formed by the light-emitting ink and a second light-emitting absorption layer formed by a second ink containing a second color material that is absorbent to the excitation light and the light emitted from the light-emitting print layer, or is formed by a fourth light-emitting absorption layer formed by a fourth ink containing the light-emitting body and the second color material, The authenticity discriminating printed matter is characterized in that the first discrimination area is formed by laminating a luminescent printed layer formed of the luminescent ink on the base material.

3. an authenticity discrimination printed matter having a printed pattern on at least a part of a substrate that is absorbent to the excitation light and the luminescence of the luminescent material, the printed pattern comprising a first discrimination region that emits a first light emission formed by luminescent ink containing a luminescent material that emits light in a predetermined wavelength range different from the excitation light when exposed to the excitation light in the predetermined wavelength range, and a second discrimination region that emits a second light emission having a lower luminescence intensity than the first light emission; and the printed pattern is made on at least a part of a substrate that is absorbent to the excitation light and the luminescence of the luminescent material, the authenticity discrimination printed matter being capable of discriminating authenticity based on the luminescence of the first discrimination region and the second discrimination region when exposed to the excitation light, the second discrimination area is formed by laminating a light-emitting print layer formed from the light-emitting ink on the base material, The authenticity-discriminating printed matter is characterized in that the first discrimination area is composed of a laminate of an luminescent printing layer formed from the luminescent ink and a fifth luminescent absorption layer formed from a fifth ink containing a third color material that has lower absorbency for the excitation light and the luminescence of the luminescent printing layer than the substrate, or is composed of a sixth luminescent absorption layer formed from the luminescent body and a sixth ink containing the third color material.

4. A method for determining the authenticity of an authenticity discriminant printed matter according to any one of claims 1 to 3, 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 a 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 a second detection means; A method for determining authenticity, characterized in that the product is determined to be genuine if the first light emission is detected in the first detection step, and the first light emission and the second light emission are detected in the second detection step.

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