Anti-counterfeiting printed materials

Abstract

This invention provides an anti-counterfeiting printed material that has infrared absorption properties that make it difficult to counterfeit compared to printed materials using only carbon black. [Solution] The present invention relates to an anti-counterfeiting printed material having a first anti-counterfeiting pattern on at least a portion of a substrate, comprising a first printed image formed with a first ink containing carbon black and a second printed image formed with a second ink containing a cobalt-based pigment, wherein only the first printed image is visible in a first infrared wavelength range of 780 nm to less than 1100 nm, and the first anti-counterfeiting pattern is visible in a second infrared wavelength range of 1100 nm or more.

Description

Technical Field

[0001] The present invention relates to an anti-counterfeiting printed matter having infrared absorption characteristics.

Background Art

[0002] Anti-counterfeiting printed matters such as banknotes, passports, stamps, postage stamps, securities, identity certificates, various tickets, security labels, etc. are required to be provided with advanced anti-counterfeiting technologies.

[0003] As one of these anti-counterfeiting technologies, an anti-counterfeiting printed matter is used in which a printing area is formed by an infrared absorption ink composition that absorbs wavelengths in the infrared region invisible to the human eye, and the printing area is irradiated with infrared rays and confirmed by a reading device.

[0004] As an example thereof, an ink for an infrared absorption marker is disclosed which is obtained by blending a matting agent selected from organic fine powders or inorganic extenders insoluble in an organic solvent in an infrared absorption ink using carbon black, an organic solvent and a resin (see, for example, Patent Document 1).

[0005] Also, a metameric pair printed matter having an image with infrared absorption characteristics using an ink composition containing carbon black is disclosed (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the technologies described in Patent Documents 1 and 2 are anti-counterfeiting printed materials formed with infrared-absorbing ink containing carbon black. Since carbon black is readily available, there was a risk that the anti-counterfeiting printed materials could be counterfeited. Furthermore, because carbon black uniformly absorbs light across the entire ultraviolet to near-infrared wavelength range, there was a risk that the anti-counterfeiting printed materials could be counterfeited if the absorption pattern was detected by a camera or other device capable of detecting light in a predetermined wavelength range.

[0008] For these reasons, there was a demand for anti-counterfeiting printed materials that possessed infrared absorption properties that made them difficult to counterfeit compared to printed materials using only carbon black. [Means for solving the problem]

[0009] The present invention relates to an anti-counterfeiting printed material characterized in that, at least a portion of the substrate has a first anti-counterfeiting pattern formed by a first ink containing carbon black, comprising a first printed image visible in a first infrared wavelength range of 780 nm to less than 1100 nm and a second infrared wavelength range of 1100 nm or more, and a second printed image visible in the second infrared wavelength range, formed by a second ink containing a cobalt-based pigment, wherein the first printed image is visible in the visible light wavelength range, only the first printed image is visible in the first infrared wavelength range, and the first anti-counterfeiting pattern is visible in the second infrared wavelength range.

[0010] The present invention relates to an anti-counterfeiting printed material having a first anti-counterfeiting pattern and a second anti-counterfeiting pattern comprising a third printed image formed by a third ink having infrared transmission properties, wherein the second anti-counterfeiting pattern is visible in the visible light wavelength range, only the first printed image is visible in the first infrared wavelength range, and the first anti-counterfeiting pattern is visible in the second infrared wavelength range.

[0011] The present invention provides an anti-counterfeiting printed material characterized in that i) a third printed image formed with a third ink having infrared transmission properties that is darker or of the same color as the first anti-counterfeiting pattern is laminated on a first anti-counterfeiting pattern so as to be the same shape as the first anti-counterfeiting pattern or so as to cover the first anti-counterfeiting pattern, or ii) a first anti-counterfeiting pattern is formed in a fitted relationship on a third printed image formed with a third ink having infrared transmission properties that is darker or of the same color as the first anti-counterfeiting pattern, wherein in the visible light wavelength range the third printed image camouflages the first anti-counterfeiting pattern so that only the third printed image is visible, in the first infrared wavelength range only the first printed image is visible, and in the second infrared wavelength range the first anti-counterfeiting pattern is visible. [Effects of the Invention]

[0012] The anti-counterfeiting printed material of the present invention combines a first image formed with carbon black and a second image formed with a cobalt-based pigment, so that the two images are visible in a predetermined infrared wavelength range. This makes it more difficult to counterfeit compared to printed material formed with carbon black alone. [Brief explanation of the drawing]

[0013] [Figure 1] An example diagram showing the spectral reflectance characteristics of each ink. [Figure 2] A diagram showing an example of anti-counterfeiting printed material (A1). [Figure 3] An example diagram illustrating the effectiveness of anti-counterfeiting printed material (A1). [Figure 4] A diagram showing a modified version of the anti-counterfeiting printed material (A1). [Figure 5] A diagram showing an example of anti-counterfeiting printed material (A2). [Figure 6] Diagram showing anti-counterfeiting printed material (A2') [Figure 7] Diagram showing a modified version of the anti-counterfeiting printed material (A2'). [Figure 8] An example diagram illustrating the effectiveness of anti-counterfeiting printed material (A2'). [Figure 9] An example diagram showing the discrimination method

Mode for carrying out the invention

[0014] The mode for carrying out the present invention will be described, but the present invention is not limited thereto, and other embodiments are also included as long as they are within the scope of the technical idea described in the claims.

[0015] First, the characteristics of the first ink containing carbon black, the second ink containing a cobalt-based pigment, and the third ink of Y (yellow), M (magenta), and C having infrared transmission characteristics without infrared absorption characteristics used in the present invention will be described with reference to FIG. 1.

[0016] As shown in FIG. 1, the first ink contains carbon black, and since the spectral reflectance near 940 nm in the first infrared wavelength range of 780 nm or more and less than 1100 nm is around 50%, the printed image formed by the first ink is visually recognized as black in the infrared wavelength range near 940 nm. On the other hand, since the spectral reflectance in the infrared wavelength range near 940 nm of the second ink and the third ink is 90% or more, the printed images formed by the second ink and the third ink are visually recognized as white in the infrared wavelength range near 940 nm.

[0017] Also, the second ink contains a cobalt-based pigment, and since the spectral reflectance decreases from around 90% to around 50% in the second infrared wavelength range of 1100 nm or more, the printed image formed by the second ink is visually recognized as black in the second infrared wavelength range of 1100 nm or more. On the other hand, since the spectral reflectance in the second infrared wavelength range of 1100 nm or more of the third ink is 90% or more, the printed image formed by the third ink is visually recognized as white in the second infrared wavelength range.

[0018] The anti-counterfeiting printed matter (A1) of the present invention is a printed matter that combines infrared absorption characteristics and infrared transmission characteristics using the aforementioned ink, and is a printed matter in which different images are visible in different infrared wavelength ranges.

[0019] (First Embodiment) Fig. 2 shows the configuration of the anti-counterfeiting printed matter (A1) in the first embodiment. Fig. 2(a) is a plan view of the anti-counterfeiting printed matter (A1), and Fig. 2(b) is an example diagram showing the configuration of the first anti-counterfeiting pattern (2) formed on the anti-counterfeiting printed matter (A1). As shown in Fig. 2(a), the anti-counterfeiting printed matter (A1) has the first anti-counterfeiting pattern (2) on at least a part of the substrate (1). Further, as shown in Fig. 2(b), the first anti-counterfeiting pattern (2) includes a first printed image (3) formed by a first ink containing carbon black and a second printed image (4) formed by a second ink containing a cobalt-based pigment. This is an example in which the first printed image (3) and the second printed image (4) are combined to form one significant piece of information.

[0020] Also, in the present invention, the colors of the first printed image (3) and the second printed image (4) are not particularly limited, and they may be different from each other or may be the same color. Also, the arrangement of the first printed image (3) and the second printed image (4) is not particularly limited, and they may partially overlap or may be arranged adjacent to each other. Further, the first printed image (3) and the second printed image (4) may each be formed as significant information alone. Note that "adjacent" as used in this specification means that at least a part of two printed images is in contact.

[0021] As shown in Figure 3, the anti-counterfeiting print (A1) allows the first anti-counterfeiting pattern (2) to be visible in the visible light wavelength range. Furthermore, as shown in Figure 3(b), the carbon black of the first ink absorbs infrared light at 940 nm in the first infrared wavelength range, and the cobalt-based pigment of the second ink does not absorb infrared light at 940 nm in the first infrared wavelength range. Therefore, in the first infrared wavelength range, only the infrared image of the first printed image (3) can be seen. Furthermore, as shown in Figure 3(c), the carbon black of the first ink and the cobalt-based pigment of the second ink absorb infrared light above 1100 nm in the second infrared wavelength range. Therefore, in the 1100 nm infrared wavelength range, the infrared image of the first anti-counterfeiting pattern (2) can be seen.

[0022] Furthermore, as shown in Figure 4, the first anti-counterfeiting pattern (2) may be a two-dimensional code called a QR code (registered trademark), with a portion of the QR code (registered trademark) forming the first printed image (3) and the remaining portion of the QR code (registered trademark) forming the second printed image (4).

[0023] (First printed image) The first printed image (3) is formed using a first ink containing carbon black having infrared absorption properties. The carbon black is not particularly limited, and known materials can be used. The average particle size of the carbon black may be adjusted as appropriate depending on the type of ink used. Furthermore, since carbon black has high coloring power, the mixing ratio with varnish should be 1.0% by weight or less.

[0024] (Composition ratio) The second printed image (4) is formed using a second ink containing a cobalt-based pigment. The cobalt-based pigment is not particularly limited, and known pigments such as Prussian blue, cobalt blue, cobalt aluminum blue, and cobalt aluminum chromium blue can be used. The average particle size of the cobalt-based pigment may be adjusted as appropriate depending on the type of ink used. Furthermore, the cobalt-based pigment only needs to be mixed in a ratio of 5.0% by weight or more with the varnish, and because it is a pale blue color, it has low coloring power, which allows for a wide color reproduction range for inks containing other colored pigments, enabling diverse color reproduction.

[0025] (First ink and second ink) Next, the first and second inks will be described. The first and second inks consist of at least the aforementioned pigment and binder components, and depending on the binder, various modifiers such as photopolymerization initiators, drying agents, dispersants, gelling agents, surfactants, and lubricants may be added.

[0026] (binder) 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, phlomenic acid, and hebenic acid; esters such as fatty acid esters; amides such as stearinamide and oleinamide; 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, tervin resins, and other resins; natural rubber; and styrene-based resins. As a heat-melting component, the following can be used: elastomers such as tadiene rubber, isoprene rubber, and chloroprene rubber; oligomers and monomers of acrylates and methacrylates; and ultraviolet-curing resins.

[0027] (Auxiliary agents / modifiers) As auxiliary agents, photopolymerization initiators such as benzyl ketal, α-hydroxyacetophenone, α-aminoacetophenone, alkylphenone compounds, acylphosphine oxide compounds, oxime ester compounds, and titanocene compounds can be used; photosensitizers such as thioxanthone, imidazole, coumarin type, pyrazoline type, thiophene type, naphthalene type, and oxazole type; thermal polymerization inhibitors such as hydroquinone and nitrosamine; acid generators such as sulfonium salts, iodonium salts, diazonium salts, and ferrocenium salts; polyvalent metals such as cobalt, manganese, cerium, zirconium, lead, iron, zinc, copper, vanadium, barium, and calcium; oil-soluble carboxylic acids such as naphthenic acid, octylic acid, resin acid, and tall oil fatty acid; and drying agents such as salts of resin acid can be used.

[0028] As waxes, natural waxes such as whale wax, beeswax, lanolin, carnauba wax, candelilla wax, and montane wax, as well as synthetic waxes such as paraffin wax, microcrystalline wax, oxide wax, ester wax, and low molecular weight polyethylene can be used.

[0029] In addition, dispersants such as polyaminoamides, hydroxyl group-containing carboxylic acid esters, acrylic block copolymers, alkylol ammonium salts, siloxanes, acrylic surface modifiers, adhesion promoters with acidic groups, ketones, esters, alcohol-based leveling agents, silicone-based and polymer-based defoamers, and antioxidants such as 2,4,6-tri-tert-butylphenol can be used.

[0030] Furthermore, organic or inorganic coloring pigments, luminous pigments such as pearl pigments, functional materials such as magnetic materials and chromic materials, and extender pigments such as calcium carbonate, barium sulfate, and silicon dioxide may be added, provided that they do not impair the infrared absorption or infrared transmission properties.

[0031] The types of the first and second inks are not particularly limited and can be used as known inks such as offset inks, letterpress inks, flexographic inks, screen printing inks, gravure inks, intaglio inks, inkjet inks, and coating liquids. The drying or polymerization method of the varnish material is also not particularly limited and can be any known method such as penetration drying, evaporation drying, oxidation polymerization, or ionizing radiation drying. It can also be in the form of toner or ribbon that can be applied by electrostatic transfer or thermal transfer.

[0032] The substrate (1) is not particularly limited as long as it does not interfere with infrared transmission and infrared absorption properties, and can be paper, plastic, or the like, which are commonly used as printing substrates.

[0033] (Second embodiment) The second embodiment is a configuration in which a first printed image (3) formed with a first ink and a second printed image (4) formed with a second ink are further combined with a third printed image (5) formed with a third ink having infrared transmission properties. The third ink having infrared transmission properties does not need to have infrared absorption properties, and known infrared transmission inks of Y (yellow), M (magenta), and C (cyan) can be used.

[0034] The anti-counterfeiting printed material (A2) of the second embodiment shown in Figure 5 is an example in which a second anti-counterfeiting pattern (6) is formed by the first anti-counterfeiting pattern (2) and the third printed image (5), and the second anti-counterfeiting pattern (6) is visible under visible light.

[0035] Furthermore, the anti-counterfeiting printed material (A2') shown in Figure 6 is an example in which the first anti-counterfeiting pattern (2) is made invisible under visible light by camouflaging it with a third printed image (5). Note that the configuration of the substrate (1), the first printed image (3), and the second printed image (4) is the same as in the first embodiment, so it will be omitted and only the differences will be explained.

[0036] As shown in Figure 5(a), the anti-counterfeiting printed material (A2) has a first anti-counterfeiting pattern (2) formed by a first printed image (3) and a second printed image (4) on at least a portion of the substrate (1), and a third printed image (5) formed by a third ink which is an infrared-transmitting ink, and also has a second anti-counterfeiting pattern (6) formed by the first anti-counterfeiting pattern (2) and the third printed image (5).

[0037] Note that the second printed image (4) and the third printed image (5) in the first infrared wavelength range shown in Figure 5(b), and the third printed image (5) in the second infrared wavelength range shown in Figure 5(c), are not visible to the naked eye and are therefore shown with dotted lines for the sake of explanation.

[0038] As shown in Figure 5(a), in the visible light wavelength range, the anti-counterfeiting printed material (A2) allows the viewing of a first anti-counterfeiting pattern (2) composed of a first printed image (3) and a second printed image (4), and a second anti-counterfeiting pattern (6) combined with a third printed image (5). Furthermore, as shown in Figure 5(b), in the first infrared wavelength range, only the infrared image of the first printed image (3) formed by the first ink is visible on the anti-counterfeiting printed material (A2), while the second printed image (4) and the third printed image (5) are not visible. Furthermore, as shown in Figure 5(c), in the second infrared wavelength range, the infrared image of the first anti-counterfeiting pattern (2) is visible on the anti-counterfeiting printed material (A2), while the third printed image (5) is not visible. Thus, different images can be viewed in the visible light wavelength range, the first infrared wavelength range, and the second infrared wavelength range, respectively.

[0039] Alternatively, a third printed image (5) may be formed by randomly arranging dummy codes using a third infrared-transmitting ink around the first anti-counterfeiting pattern (2), which is formed as a QR code (registered trademark) as shown in Figure 4 above. (Not shown.)

[0040] Next, a modified example will be described in which the first anti-counterfeiting pattern (2) is camouflaged using a third printed image (5). As shown in Figures 6(a) and 6(b), the anti-counterfeiting printed material (A2') has a second anti-counterfeiting pattern (6) laminated on at least a portion of the substrate (1) such that the third printed image (5), formed with the third ink, covers the first anti-counterfeiting pattern (2) shown by the dotted line. In the second embodiment, in Figures 6(a) and 6(b), the first anti-counterfeiting pattern (2) is not visible under visible light, so for the sake of explanation, it is shown only by the outline of the image.

[0041] The color of the third printed image (5) is preferably darker than the first anti-counterfeiting pattern (2) or the same color as the first anti-counterfeiting pattern (2) if it is to camouflage the first anti-counterfeiting pattern (2). However, if camouflage is not necessary, it may be lighter than the first anti-counterfeiting pattern (2), and there are no particular restrictions.

[0042] Furthermore, as shown in Figure 7(a), the second anti-counterfeiting pattern (6) may be formed by fitting the third printed image (5) onto the first anti-counterfeiting pattern (2), or the first anti-counterfeiting pattern (2) and the third printed image (5) may be formed adjacent to each other. Moreover, as shown in Figure 7(b), the first anti-counterfeiting pattern (2) and the third printed image (5) may be formed by stacking them with the same shape, or the third printed image (5) may be formed by stacking it with a different shape from the first anti-counterfeiting pattern (2).

[0043] Next, the effect of the anti-counterfeiting print (A2') shown in Figure 6 will be explained with reference to Figure 8. As shown in Figure 8(a), in the visible light wavelength range, only the second anti-counterfeiting pattern (6) of the anti-counterfeiting print (A2') is visible, and the first anti-counterfeiting pattern (2), which is camouflaged by the third printed image (5), is not visible. Furthermore, as shown in Figure 8(b), at 940 nm in the first infrared wavelength range, the third printed image (5) formed by the third ink, which is an infrared-transmitting ink, and the second printed image (4) formed by the second ink do not absorb infrared light in the 940 nm infrared wavelength range in the first infrared wavelength range, so only the infrared image of the first printed image (3) is visible. Furthermore, as shown in Figure 8(c), the carbon black of the first ink and the cobalt-based pigment of the second ink absorb infrared wavelengths above 1100 nm in the second infrared wavelength range. Therefore, in the second infrared wavelength range above 1100 nm, the infrared image of the first anti-counterfeiting pattern (2), which consists of the first printed image (3) and the second printed image (4), can be seen.

[0044] Therefore, in this second embodiment, different images can be viewed in three regions: the visible light wavelength range, the first infrared wavelength range, and the second infrared wavelength range.

[0045] (Discrimination method) Next, an example of a method for identifying the anti-counterfeiting printed material (A1) of the present invention will be described.

[0046] As shown in Figure 9, first, it is confirmed that the infrared image of the first printed image (3) can be detected. Next, it is confirmed that the infrared image of the first anti-counterfeiting pattern (2) can be detected. Since the infrared image of the first printed image (3) and the infrared image of the first anti-counterfeiting pattern (2) can be detected, it can be determined to be "genuine".

[0047] In detail, in a first infrared wavelength range of 780 nm to less than 1100 nm, an infrared image of the first printed image (3) is detected by a known infrared camera or infrared monitor equipped with a sensor such as a Si photodiode. Next, in a second infrared wavelength range of 1100 nm or more, an infrared image of the first anti-counterfeiting pattern (2) is detected by an infrared camera or infrared monitor using a solid-state image sensor made of InGaAs (indium gallium arsenide), which is more sensitive than a Si photodiode, for example.

[0048] Thus, if both the infrared image of the first printed image (3) in the first infrared wavelength range from 780 nm to less than 1100 nm and the infrared image of the first anti-counterfeiting pattern (2) in the second infrared wavelength range of 1100 nm or more are detected, the anti-counterfeiting printed material (A1) is determined to be "genuine". Note that the order in which the first printed image (3) and the first anti-counterfeiting pattern (2) are detected may be reversed.

[0049] Next, examples of the present invention will be shown, but these examples do not limit the embodiments of the present invention.

[0050] (Example 1) First, Table 1 shows the formulations of the first and second inks.

[0051] [Table 1]

[0052] Next, using the first and second inks shown in Table 1, an anti-counterfeiting printed material (A1) in the form shown in Figure 2 was prepared. Specifically, the substrate (1) used was high-quality paper (Shiraoi, Nippon Paper Industries Co., Ltd.). The first print image (3) was printed using the first ink, and the second print image (4) was printed using the second ink, using a small, hand-operated offset printing press to form the first anti-counterfeiting pattern (2). The first and second inks were brown inks of the same color.

[0053] Next, the effectiveness of the fabricated anti-counterfeiting print (A1) was confirmed. As shown in Figure 3(a), the first anti-counterfeiting pattern (2) of the anti-counterfeiting print (A1) was visible in the visible light wavelength range. Furthermore, as shown in Figure 3(b), in the first infrared wavelength range of 940 nm, only the infrared image of the first printed image (3) was visible using an infrared camera equipped with a Si photodiode. Furthermore, as shown in Figure 3(c), in the second infrared wavelength range of 1100 nm, the infrared image of the first anti-counterfeiting pattern (2) was visible using an infrared camera equipped with an InGaAs element.

[0054] (Example 2) Next, an anti-counterfeiting printed material (A2) in the form shown in Figure 5(a) was prepared. Specifically, the first printed image (3) was created using the first ink shown in Table 1, and the second printed image (4) was created using the second ink to form the first anti-counterfeiting pattern (2). Furthermore, as the third ink, only Bestcure UV L Carton K process inks in blue, red, and yellow were used to create the third printed image (5), which was combined with the first anti-counterfeiting pattern (2) to form the second anti-counterfeiting pattern (6). The first, second, and third inks were all brown inks of the same color. The substrate (1) used was high-quality paper (Shiraoi, manufactured by Nippon Paper Industries Co., Ltd.). The printing press used was an offset proofing press (Shimogaki Iron Works Co., Ltd., HP-60 model).

[0055] Next, the effectiveness of the fabricated anti-counterfeiting printout (A2) was confirmed. As shown in Figure 5(a), the second anti-counterfeiting pattern (6) of the anti-counterfeiting printout (A2) was visible in the visible light wavelength range. Furthermore, as shown in Figure 5(b), in the first infrared wavelength range of 940 nm, only the infrared image of the first printed image (3) was visible using an infrared camera equipped with a Si photodiode. Furthermore, as shown in Figure 5(c), in the second infrared wavelength range of 1100 nm, the infrared image of the first anti-counterfeiting pattern (2) was visible using an infrared camera equipped with an InGaAs element.

[0056] Next, we will describe an example using a discrimination device. To determine the authenticity of an anti-counterfeiting printed material (A2 size), we used a silicon photodiode manufactured by Hamamatsu Photonics K.K. and a photodiode module C-10439 (InGaAs photodiode) also manufactured by Hamamatsu Photonics K.K. The discrimination threshold was set as shown in Table 2.

[0057] [Table 2]

[0058] As shown in Table 3, when detected with a Si photodiode, the detection values ​​for the first print image (3), the second print image (4), and the third print image were within the threshold range. Next, when detected with an InGaAs photodiode module, the detection values ​​for the first print image (3) and the second print image (4) were also within the threshold range, indicating that the detection values ​​for the first print image (3), the second print image (4), and the third print image were all within the threshold range. Since detection values ​​within the threshold range were obtained with both the Si photodiode and the InGaAs photodiode module, the anti-counterfeiting printout (A2) could be determined to be "genuine".

[0059] [Table 3] [Explanation of Symbols]

[0060] A1, A2, A2´ anti-counterfeiting printed matter 1 Base material 2. First anti-counterfeiting pattern 3. First printed image 4. Second print image 5. Third printed image 6. Second anti-counterfeiting pattern

Claims

1. A first printed image is formed on at least a portion of the substrate using a first ink containing carbon black, and is visible in a first infrared wavelength range of 780 nm to less than 1100 nm and a second infrared wavelength range of 1100 nm or more. It has a first anti-counterfeiting pattern formed by a second ink containing a cobalt-based pigment, which comprises a second printed image visible in the second infrared wavelength range, An anti-counterfeiting printed material characterized in that the first printed image is visible in the visible light wavelength range, only the first printed image is visible in the first infrared wavelength range, and the first anti-counterfeiting pattern is visible in the second infrared wavelength range.

2. The invention comprises the first anti-counterfeiting pattern and a second anti-counterfeiting pattern comprising a third printed image formed by a third ink having infrared transmission properties. The anti-counterfeiting printed material according to claim 1, characterized in that the second anti-counterfeiting pattern is visible in the visible light wavelength range, only the first printed image is visible in the first infrared wavelength range, and the first anti-counterfeiting pattern is visible in the second infrared wavelength range.

3. i) A third printed image is formed on the first anti-counterfeiting pattern by laminating a third ink having infrared transmission properties that is darker or of the same color as the first anti-counterfeiting pattern, either in the same shape as the first anti-counterfeiting pattern or covering the first anti-counterfeiting pattern, or ii) The first anti-counterfeiting pattern is formed in a fitted relationship on a third printed image formed with a third ink having infrared transmission properties that is darker or of the same color as the first anti-counterfeiting pattern, The anti-counterfeiting printed material according to claim 1, characterized in that in the visible light wavelength range, the third printed image camouflages the first anti-counterfeiting pattern so that only the third printed image is visible, in the first infrared wavelength range, only the first printed image is visible, and in the second infrared wavelength range, the first anti-counterfeiting pattern is visible.

Images