JP4701430B2 - Authenticity discrimination method for printed matter and printed matter - Google Patents

Description

The present invention relates to a printed matter authenticity determination method applicable to valuables such as banknotes, passports, securities, cards, stamps, product tags, toll roads, various tickets, and the like, and the printed matter. .

Anti-counterfeiting technology has been applied to valuable items such as banknotes, passports, securities, cards, stamps, product tags, toll road tickets, and various tickets. For this reason, such valuables are printed with metallic gloss inks such as silver ink and gold ink, which are difficult to reproduce on a copying machine because of high material costs, and are subjected to copy prevention and authenticity determination. . Furthermore, by using a fluorescent ink that emits visible light when irradiated with ultraviolet rays or an infrared absorbing ink containing a material that absorbs infrared rays, the area printed with the above ink is usually not visible under visible light. A technique has been used in which a region printed with the above ink becomes obvious by irradiating infrared rays.

For example, as a technique using a metallic gloss ink such as silver ink or gold ink, a metallic gloss region is provided on the uneven surface of a sheet-like or belt-like support, and the metal gloss region is provided on at least a part of the metallic gloss region. An anti-counterfeit display body in which another metallic glossy region of the same, same quality and / or different quality as the region is laminated with ink, wherein the metallic glossy region formed on the uneven surface of the support is the surface of the support An anti-counterfeiting display body characterized by irregular reflection with respect to incident light due to unevenness, and other metal gloss areas laminated on the upper surface of the metal gloss area exhibit regular reflection with respect to incident light due to a flat surface. A manufacturing method is disclosed (see Patent Document 1).

For example, as a technique using a metal thin film, a first light reflecting portion composed of a first metal thin film layer and a first underlayer, a second metal thin film layer and a second underlayer composed of a second underlayer. And the first underlayer is different from the second underlayer, and the surface roughness of the first metal thin film layer is different from that of the second metal thin film layer. An anti-copy medium characterized by a difference in surface roughness is disclosed (see Patent Document 2).

For example, in a printed material composed of at least two print areas, a first print area and a second print area, the first print area is printed in a different color depending on an observation angle, and the second print area is There is disclosed a printed matter that is printed in the same color as the diffuse reflection color of the print color of the first print area (see Patent Document 3).

For example, the printing area includes a first printing area printed with a printing ink having infrared absorption characteristics, and a second printing area printed with a general printing ink. The first printing area and the second printing area It is a printed matter in which the color tone of the printing area is visually difficult to distinguish, the printing ink of the first printing area is printed with the printing ink containing the infrared absorbing pigment, and the first printing area is visualized by the absorption of infrared rays. An infrared-absorbing printed material characterized in that is disclosed (see Patent Document 4).
Japanese Patent No. 3449690 (page 1-13, FIG. 1-12) Japanese Patent Laid-Open No. 10-81056 (page 1-9, FIG. 1-4) Japanese Patent Laying-Open No. 2005-14300 (page 1-8, FIG. 1) JP-A 63-307996 (first page, FIG. 2)

However, in Japanese Patent No. 3449690, Japanese Patent Application Laid-Open No. 2005-14300, Japanese Patent Application Laid-Open No. 2005-14300, and Japanese Patent No. 3449690, in any case, when the substrate is tilted under visible light, It is possible to determine authenticity when observed with the naked eye, and does not describe any authenticity determination means by machine reading. Japanese Patent Laid-Open No. 10-81056 has a problem that it cannot be determined if the valuable is genuine unless it is copied. Moreover, since the metal thin film is formed by vacuum deposition or sputtering, the cost is high. Further, when a metal thin film is formed on a paper substrate, there is a problem that the metal thin film is difficult to fix unless a resin is coated on the paper substrate.

Japanese Laid-Open Patent Publication No. 63-307996 is a printed material that can be determined as genuine when observed under infrared light, and cannot be determined as true or false under visible light.

In view of the above, the present invention aims to solve such a conventional problem, and the latent image cannot be visually recognized only under limited conditions. By forming either one of the two printing areas with metallic gloss ink and the other with infrared absorbing ink or infrared transmitting ink (process ink or spot color ink), the first printing area and the second printing area are When observed with the naked eye under visible light, the diffused light region is visually recognized in the same color, the specularly reflected light region is visually recognized in a different color (density), and the printed matter is further observed with the infrared display device in the diffused light region and / or Proposal of a method for determining the authenticity of printed matter in which a latent image is visually recognized due to a difference in density between infrared display images in the first printed region and the second printed region when the specularly reflected light region is observed. Eyes to do To.

The present invention forms a printed pattern on a substrate, and the printed pattern has a first print region for forming a background image portion and a second print region for forming a latent image portion. In the method for determining the authenticity of a printed matter, in which one of the printing region and the second printing region is formed with a metallic gloss ink and the other is formed with an infrared absorbing ink, the printed matter is specularly reflected by an infrared display device. This is a method for determining the authenticity of printed matter in which the latent image is visually recognized by changing the density of the infrared display image in the first print area and the second print area when observed in the area.

In the present invention, a printed pattern is formed on a base material, and the printed pattern has a first printed region that forms a background image portion and a second printed region that forms a latent image portion, In a method for determining the authenticity of a printed matter, in which one of the first printing region and the second printing region is formed with a metallic glossy ink and the other is formed with an infrared transmitting ink, the printed matter is diffused by an infrared display device. When observed in the light region and the specular reflection light region, the density of the infrared display image in the first print region and the second print region changes, and the authenticity determination of the printed matter formed by visually observing the latent image Is the method.

In the present invention, a printed pattern is formed on a base material, and the printed pattern has a first printed region that forms a background image portion and a second printed region that forms a latent image portion, One of the first print area and the second print area is formed with a metallic gloss ink, and the other is formed with an infrared absorbing ink. The printed material includes the first print area and the second print area. The second printed area is visually recognized in the same color in the diffused light area when viewed with the naked eye under visible light, and is viewed in a different color in the regular reflected light area. When observed in the area, the density of the infrared display image in the first print area and the second print area changes, and the latent image is visually recognized.

In the present invention, a printed pattern is formed on a base material, and the printed pattern has a first printed region that forms a background image portion and a second printed region that forms a latent image portion, One of the first print area and the second print area is a printed material formed with a metallic gloss ink and the other is formed with an infrared transmitting ink. The printed material includes the first print area and the second print area. The second printed area is visually recognized in the same color in the diffused light area when viewed with the naked eye under visible light, and is viewed in a different color in the specularly reflected light area. When the specular reflection light area is observed, the density of the infrared display image in the first print area and the second print area changes, and the latent image is visually recognized.

Further, according to the present invention, the 60 ° specular gloss value of the region formed with the metallic gloss ink is 5.0 or more among the first printing region and the second printing region, and the region formed with the metallic gloss ink. And the difference in the 60 ° specular gloss value of the region formed with the infrared absorbing ink is 1.0 or more.

Further, according to the present invention, the 60 ° specular gloss value of the region formed with the metallic gloss ink is 5.0 or more among the first printing region and the second printing region, and the region formed with the metallic gloss ink. And the difference in 60 ° specular gloss value of the region formed with the infrared transmitting ink is 1.0 or more.

In the printed matter authenticity determination method and printed matter according to the present invention, the latent image is visually recognized under a plurality of conditions under visible light and infrared light, and any one of the first printed region and the second printed region is used. By forming either one with metallic luster ink and the other with infrared absorbing ink or infrared transmitting ink (process ink or special color ink), the first and second printing areas are visible to the naked eye. In the diffuse light area, the latent image is visually recognized in a different color (density) in the specular reflection area, and the printed matter is further viewed in the diffuse light area and / or specular reflection on the infrared display device. When the light area is observed, the latent image is visually recognized due to a difference in density between the infrared display images in the first print area and the second print area. The visibility of the latent image below It is possible to authenticity discrimination by free.

Of course, since either one of the first print area and the second print area is printed with the metallic gloss ink, it has a copy prevention effect. Further, since only one of the first printing area and the second printing area is printed with the metallic gloss ink, it can be manufactured at low cost.

The best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

FIG. 1 shows a schematic diagram of a printed matter A1 of the present invention. A printed pattern 2 is formed on a substrate 1, and the printed pattern 2 has a first region 3 that forms a background image portion and a second region 4 that forms a latent image portion. The first region 3 that forms the background image portion is printed with metallic gloss ink, and the second region 4 that forms the latent image portion is printed with infrared absorbing ink to obtain a printed matter A1. The first region 3 that forms the background image portion may be printed with infrared absorbing ink, and the second region 4 that forms the latent image portion may be printed with metallic gloss ink.

The first region 3 forming the background image portion is preferably printed with a metallic gloss ink and has a 60 ° specular gloss value of 5.0 or more. The first region 3 formed with the metallic gloss ink and the infrared absorbing ink It is preferable that the difference in 60 ° specular gloss value of the second region 4 forming the latent image portion formed in step 1 is 1.0 or more. Further, the first region 3 printed with the metallic gloss ink and the second region 4 printed with the infrared absorbing ink are made to be the same color in the diffused light region under visible light and the diffused light region under infrared light. Perform color matching on.

As shown in FIG. 2 (a), when observed with the naked eye in a diffused light region under visible light, the printed matter A1 includes a first region 3 as a background image portion and a second region 4 as a latent image portion. Since the densities are almost the same, it is difficult to confirm the latent image. The 60 ° specular gloss value of the first region 3 which is the background image portion is 5.0 or more, the 60 ° specular gloss value of the second region 4 which is the latent image portion is 1.0 or more lower than the above region, and visible light As shown in FIG. 2B, the incident light V1 forms the background image portion in the diffuse light region, and the first region 3 that forms the background image portion is generated in the first region 3 that forms the background image portion. The diffuse reflected light V2 ′ of the region 3 is obtained. In the second region 4 forming the latent image portion, the specular reflection light V3 ″ and visible light are absorbed with respect to the incident light V1, and the diffuse reflection light V2 ″ of the second region 4 forming the latent image portion is formed. Is obtained. The difference between the diffusely reflected light V2 ′ of the first region 3 and the diffusely reflected light V2 ″ of the second region 4 is difficult to confirm with the naked eye. Therefore, when observed with the naked eye in the diffused light region under visible light In the printed matter A1, since the density of the first region 3 as the background image portion and the second region 4 as the latent image portion are substantially the same, it is difficult to confirm the latent image.

As shown in FIG. 3A, when observed with the naked eye in a specularly reflected light region under visible light, the printed matter A1 includes a first region 3 that is a background image portion and a second region 4 that is a latent image portion. Thus, a difference in density (gloss difference) is generated and the latent image can be confirmed. The 60 ° specular gloss value of the first region 3 which is the background image portion is 5.0 or more, the 60 ° specular gloss value of the second region 4 which is the latent image portion is 1.0 or more lower than the above region, and is visible. In order to absorb light, as shown in FIG. 3B, the incident light V1 is a specularly reflected light region, and the first region 3 that forms the background image portion obtains specularly reflected light V3 ′. In the second region 4 forming the latent image portion, specularly reflected light V3 ″ is obtained by irregular reflection on the surface and absorption of visible light. Therefore, the specularly reflected light V3 ′ in the first region 3 is the second reflected light. The density difference (gloss difference) between the first area 3 which is the background image portion and the second area 4 which is the latent image portion due to the difference in the gloss value. Occurs and the latent image can be confirmed.

As shown in FIG. 4A, when the diffused light region is observed with an infrared display device, the printed matter A1 is displayed in the infrared region of the first region 3 that is the background image portion and the second region 4 that is the latent image portion. Since the image density is almost the same, it is difficult to confirm the latent image. Since the second region 4 which is the latent image portion is printed with the infrared absorbing ink, the infrared ray is absorbed under the infrared ray to obtain the diffused light R2 ″. As shown in FIG. In the first region 3 where the 60 ° specular gloss value is 5.0 or more, the incident light R1 generates specularly reflected light R3 ′, and diffused light R2 ′ is obtained in the diffused light region. When the region is observed, the diffused light R2 ′ of the first region 3 which is the background image portion and the diffused light R2 ″ of the second region 4 which is the latent image portion are equal and are visually recognized as black. Therefore, when the diffused light region is observed with the infrared display device, the printed matter A1 has substantially the same density of infrared display images in the first region 3 as the background image portion and the second region 4 as the latent image portion. Therefore, it is difficult to confirm the latent image.

As shown in FIG. 5A, when the specularly reflected light region is observed with an infrared display device, the printed matter A1 includes a first region 3 that is a background image portion and a second region 4 that is a latent image portion. A density difference is generated in the infrared display image, and the latent image can be confirmed. Since the second area 4 which is the latent image portion is printed with the infrared absorbing ink, the infrared region is confirmed to be black by absorbing the infrared ray, and the first area which is the background image portion as shown in FIG. 5B. When the 60 ° specular gloss value is 5.0 or more, regular reflection light R3 ′ is obtained by incident light R1. The first region 3 as the background image portion has a 60 ° specular gloss value higher by 1.0 or more than the second region 4 as the latent image portion, so that the regular reflection light R3 ′ is higher than the regular reflection light R3 ″. Therefore, when the specularly reflected light area is observed with an infrared display device, the printed matter A1 has a first area 3 that is a background image portion and a second area that is a latent image portion. Thus, a difference in density occurs in the infrared display image 4 and the latent image can be confirmed.

As shown in FIGS. 2 and 3, the printed matter A1 when viewed with the naked eye in the diffused light region under visible light includes the first region 3 that is the background image portion and the second region 4 that is the latent image portion. Therefore, it is difficult to confirm the latent image. When the specular reflection light region is observed with the naked eye, a density difference (gloss difference) is generated between the first region 3 as the background image portion and the second region 4 as the latent image portion to confirm the latent image. When the diffused light area is observed with the infrared display device as shown in FIGS. 4 and 5, the printed matter A1 is the first area 3 that is the background image portion. Since the density of the second region 4 that is the latent image portion is almost the same, it is difficult to confirm the latent image, but when the specularly reflected light region is observed with an infrared display device, the second region 4 is the background image portion. And a second authenticity determining means based on whether or not the latent image can be confirmed due to a difference in density between the first region 3 and the second region 4 which is a latent image portion.

The first region 3 that forms the background image portion is preferably printed with a metallic gloss ink and has a 60 ° specular gloss value of 5.0 or more, and the second region 4 that forms the latent image portion has infrared absorption. It is preferable that the 60 ° specular gloss value is 1.0 or more lower than the area printed with ink. When the first region 3 is printed with metallic gloss ink and the 60 ° specular gloss value is lower than 5.0, the first region 3 and the second region are less specularly reflected under visible light and / or infrared light. In the case where the latent image formed of 4 can be visually confirmed, and when the specularly reflected light region is observed with an infrared display device, the first region 3 may not be visually recognized as white, and the diffused light region is observed with an infrared display device. There is a possibility that the first region 3 is not visually recognized as black. If the 60 ° specular gloss value of the second region 4 printed with the infrared absorbing ink is less than 1.0 than the 60 ° specular gloss value of the first region 3, the specular reflection region under visible light and under infrared When the printed matter A1 is observed with the naked eye in the diffused light area in FIG. 5, the printed image A1 has a density difference between the first area 3 as the background image portion and the second area 4 as the latent image portion, so that the latent image is confirmed. There is a risk of being.

FIG. 6 shows a schematic diagram of the printed matter A2 of the present invention. A printed pattern 2 is formed on a substrate 1, and the printed pattern 2 has a first region 3 that forms a background image portion and a second region 4 that forms a latent image portion. The first region 3 that forms the background image portion is printed with metallic gloss ink, and the second region 4 that forms the latent image portion is infrared transmissive ink [any one of process inks (Y, M, C). Or a special color ink) to obtain a printed matter A2. The first region 3 that forms the background image portion may be printed with process ink or spot color ink, and the second region 4 that forms the latent image portion may be printed with metallic gloss ink.

The first area 3 forming the background image portion is preferably printed with metallic gloss ink and has a 60 ° specular gloss value of 5.0 or more. The first area 3 formed with metallic gloss ink and the infrared transmission ink It is preferable that the difference in 60 ° specular gloss value of the second region 4 forming the latent image portion formed in step 1 is 1.0 or more. Further, the first region 3 printed with the metallic gloss ink and the second region 4 printed with the infrared transmitting ink are color-matched so as to be the same color in the diffused light region under visible light.

As shown in FIG. 7A, the printed matter A2 when viewed with the naked eye in a diffused light region under visible light includes a first region 3 that is a background image portion and a second region 4 that is a latent image portion. Therefore, it is difficult to confirm the latent image. The 60 ° specular gloss value of the first region 3 which is the background image portion is 5.0 or more, the 60 ° specular gloss value of the second region 4 which is the latent image portion is 1.0 or more lower than the above region, and is visible. In order to absorb light, as shown in FIG. 7 (b), the incident light V1 forms a background image portion in the diffused light region, and the first region 3 generates specularly reflected light V3 ′ to form the background image portion. 1 is obtained. In the second region 4 that forms the latent image portion, absorption of specular reflection light V3 ″ and visible light occurs, and diffuse reflection light V2 ″ of the second region 4 that forms the latent image portion is obtained. The difference between the diffusely reflected light V2 ′ of the first region 3 and the diffusely reflected light V2 ″ of the second region 4 is difficult to confirm with the naked eye. Therefore, when observed with the naked eye in the diffused light region under visible light In the printed matter A2, since the density of the first region 3 as the background image portion and the second region 4 as the latent image portion are substantially the same, it is difficult to confirm the latent image.

As shown in FIG. 8A, the printed matter A2 when viewed with the naked eye in a specularly reflected light region under visible light includes a first region 3 that is a background image portion and a second region that is a latent image portion. A density difference (gloss difference) is generated in 4 and the latent image can be confirmed. The 60 ° specular gloss value of the first region 3 which is the background image portion is 5.0 or more, the 60 ° specular gloss value of the second region 4 which is the latent image portion is 1.0 or more lower than the above region, In order to absorb visible light, as shown in FIG. 8B, the incident light V1 is a specularly reflected light region, and the first region 3 that forms the background image portion obtains specularly reflected light V3 ′. In the second region 4 forming the latent image portion, specularly reflected light V3 ″ is obtained by irregular reflection on the surface and absorption of visible light. Therefore, the specularly reflected light V3 ′ in the first region 3 is the second reflected light. The density difference (gloss difference) between the first area 3 which is the background image portion and the second area 4 which is the latent image portion due to the difference in the gloss value. Occurs and the latent image can be confirmed.

As shown in FIG. 9A, when the diffused light area is observed with an infrared display device, the printed matter A2 has infrared rays in the first area 3 that is the background image portion and the second area 4 that is the latent image portion. A density difference occurs in the display image, and the latent image can be confirmed. As shown in FIG. 9B, since the second region 4 which is a latent image portion is printed with infrared transmitting ink, it transmits infrared light under the infrared light (incident light R1) and diffusely reflects from the substrate. On the other hand, the diffused light R2 ″ is confirmed to be white by R4 ″. On the other hand, in the first region 3 which is the background image portion, when the 60 ° specular gloss value is 5.0 or more, the incident light R1 generates specularly reflected light R3 ′ and diffuses. In the light region, diffused light R2 ′ is obtained. When the diffused light region is observed with an infrared display device, the first region 3 as the background image portion is visible as black because the diffused light R2 ′ becomes low due to a 60 ° specular gloss value of 5.0 or more, and is a latent image portion. In the second region 4, the diffused light R 2 ″ becomes higher due to the irregular reflection R 4 ″ from the base material and is visually recognized as white. Therefore, when the diffused light region is observed with the infrared display device, the printed matter A2 has a density difference between the infrared display image of the first region 3 as the background image portion and the second region 4 as the latent image portion. Thus, the latent image can be confirmed.

As shown in FIG. 10A, when the specularly reflected light region is observed with an infrared display device, the printed matter A2 includes a first region 3 that is a background image portion and a second region 4 that is a latent image portion. A density difference occurs in the infrared display image, and the latent image can be confirmed. As shown in FIG. 10 (b), since the second region 4 which is a latent image portion is printed with infrared transmitting ink, diffused light R3 ″ is confirmed by irregular reflection R4 ″ from the substrate, In the first area 3 as the background image portion, when the 60 ° specular gloss value is 5.0 or more, the incident light R1 is a regular reflection light R3 ′. The first region 3 as the background image portion has a 60 ° specular gloss value higher by 1.0 or more than the second region 4 as the latent image portion, so that the regular reflection light R3 ′ is higher than the regular reflection light R3 ″. In the specularly reflected light region under infrared, the second region 4 that is a latent image portion is visually recognized as dark, so that when the specularly reflected light region is observed with an infrared display device, the printed matter A2 is The latent image can be confirmed by producing a difference in density between the infrared display images of the first region 3 as the background image portion and the second region 4 as the latent image portion.

As shown in FIG. 7 and FIG. 8, when observed with the naked eye in a diffused light region under visible light, the printed matter A2 includes a first region 3 that is a background image portion and a second region 4 that is a latent image portion. Since the densities are almost the same, it is difficult to confirm the latent image. Whether the latent image can be confirmed by a difference in density between the first region 3 as the background image portion and the second region 4 as the latent image portion when observed with the naked eye in the specular reflection state. When the first authenticity determination means based on whether or not and the external line display device as shown in FIGS. 9 and 10, the printed matter A2 is the first region 3 that is the background image portion and the first image that is the latent image portion. The second area 4 includes second authenticity determination means based on whether or not the latent image is confirmed due to a difference in density between the infrared display images in the diffused light area and the specularly reflected light area, and whether the brightness of the image changes. .

The first region 3 that forms the background image portion is preferably printed with metallic gloss ink and has a 60 ° specular gloss value of 5.0 or more. The second region 4 that forms the latent image portion is transparent to infrared rays. It is preferable that the 60 ° specular gloss value is 1.0 or more lower than the area printed with ink. When the first region 3 is printed with metallic gloss ink and the 60 ° specular gloss value is lower than 5.0, the specular reflection light under visible light and / or infrared light is small, and the first region 3 and the second region 3 The latent image formed of the region 4 can be visually recognized. Further, when the specular reflection light region is observed with the infrared display device, the first region 3 may not be visually recognized as white, and the diffused light region is observed with the infrared display device. In some cases, the first region 3 may not be visually recognized as black. If the 60 ° specular gloss value of the second region 4 printed with the infrared transmitting ink is less than 1.0 than the 60 ° specular gloss value of the first region 3, the specular reflection region under visible light and under infrared When the printed matter A2 is observed in the diffused light region in FIG. 2, the printed image A2 has a density difference between the first region 3 which is the background image portion and the second region 4 which is the latent image portion, so that the latent image is confirmed. There is a fear.

The printed matter of the present invention may be a combination of the printed matter A1 and the printed matter A2 described above. The first area can be printed with the metallic gloss ink, the second area can be printed with the infrared transmitting ink, and the third area can be printed with the infrared absorbing ink to obtain the effects of both the printed matter A1 and the printed matter A2. . For example, as shown in FIG. 11, a printed pattern 2 is formed on a substrate 1, and the printed pattern 2 includes a first region 3 that forms a background image portion and a second region that forms a first latent image portion. It has the area | region 4 and the 3rd area | region 5 which forms the 2nd latent image image part. The first region 3 that forms the background image portion is printed with metallic gloss ink, and the second region 4 that forms the first latent image portion is printed with infrared transmission ink, and the second latent image image is printed. The third region 5 forming the part is printed with infrared absorbing ink to obtain a printed matter A3. The first region 3 that forms the background image portion is printed with metallic gloss ink and has a 60 ° specular gloss value of 5.0 or more, and the second region 4 that forms the first latent image portion is the infrared transmitting ink. The third area 5 forming the second latent image portion is 60 ° lower than the first area 3 printed by the infrared absorbing ink. The specular gloss value is preferably low by 1.0 or more.

As shown in FIG. 12, when the printed matter A3 is observed with the naked eye in a diffused light region under visible light, the printed matter is a first region 3 that is a background image portion and a second portion that is a first latent image portion. Since the densities of the area 4 and the third area 5 as the second latent image portion are almost the same, it is difficult to confirm the latent image. As shown in FIG. 13, when the printed matter A3 is observed with the naked eye in a specularly reflected light region under visible light, the printed matter is a first region 3 that is a background image portion and a first latent image portion that is a first latent image portion. The density difference (gloss difference) is generated in the area 4 of No. 2 and the latent image can be confirmed. Further, a density difference (gloss difference) is generated between the first region 3 as the background image portion and the third region 5 as the second latent image portion, so that the latent image can be confirmed. As shown in FIG. 14, the printed matter A3 is an infrared display device for observing the diffused light region. The printed matter is composed of a first region 3 that is a background image portion and a second region 4 that is a first latent image portion. A density difference occurs in the infrared display image, and the latent image can be confirmed. When the diffused light region is observed with the infrared display device, the printed matter has substantially the same density as the infrared display image in the first region 3 as the background image portion and the third region 5 as the second latent image portion. Therefore, it is difficult to confirm the latent image. As shown in FIG. 15, when the specularly reflected light region is observed with an infrared display device, the printed matter A3 includes a first region 3 that is a background image portion and a third region that is a second latent image portion. A difference in density occurs in the infrared display image in the region 5 so that the latent image can be confirmed. When the specularly reflected light region is observed with an infrared display device, the printed matter has a density difference between the infrared display image in the first region 3 that is the background image portion and the second region 4 that is the first latent image portion. It is possible to confirm the latent image.

The metallic gloss ink is gold ink, silver ink, pearl ink, cholesteric liquid crystal ink, ink containing aluminum powder, ink containing bronze powder, or ink containing glass flakes. The infrared absorbing ink is an ink in which an infrared absorbing material such as carbon black is contained in process ink or special color ink. The process ink is an infrared transmitting ink of any one of yellow ink, magenta ink, and cyan ink, or an infrared transmitting ink that is a mixture of yellow ink, magenta ink, and cyan ink. The special color ink is an infrared transmitting ink other than yellow ink, magenta ink, and cyan ink.

The base material used for the printed material of the present invention is not particularly limited, and paper sheets such as high-quality paper, coated paper, and art paper, films, and the like can be used. The smoothness of the substrate is preferably 1000 seconds or more and less than 2,000 seconds.

In the best mode for carrying out the present invention, a gloss meter micro-TRI-gloss manufactured by BYK-Gardner was used to measure the 60 ° specular gloss value of the printed matter.

The printing method of the printed matter of the present invention is not particularly limited, such as an offset printing method, a gravure printing method, a screen printing method, a flexographic printing method, an ink jet printer, a laser printer, etc., but an offset printing method and an ink jet printer method are particularly preferable. .

The configuration of the printed pattern can be formed by a solid, halftone dot, line drawing, mesh screen, white line screen, or contact screen.

Since the printed pattern or the latent image portion can be composed of at least one of letters, numbers, symbols, and patterns, the design is not particularly limited. By forming with a color pattern or the like, the forgery prevention effect and the design are improved.

Further, as a method for determining authenticity of a printed matter according to the present invention, authenticity determination by a computer is possible, and a latent image that is visually recognized by an infrared display device of the printed matter according to the present invention is stored in advance in a storage means of a computer as a reference image. The image data of the latent image that is visually recognized by the infrared display device of the object to be discriminated that is the printed matter of the present invention is read, and the read image data is compared with the reference image stored in advance by a calculation means such as pattern matching, If it is within a predetermined reference range, it is genuine, and if it is outside the reference range, it is determined to be fake, and authenticity can be determined.

EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, the content of this invention is not limited to the range of these Examples.

(Example 1)
An ink jet printer (EPSON PX-G900) is used to form a printed pattern 2 on a photographic paper (EPSON made). The printed pattern 2 includes a first area 3 that forms a background image portion, and a latent image portion. The second region 4 is formed. The first region 3 forming the background image portion is printed with gold colloid ink (manufactured by Nippon Paint Co., Ltd.), and the second region 4 forming the latent image portion is black containing an infrared absorbing material. The printed matter of Example 1 was obtained by printing with ink (matt black made by EPSON). The first region 3 that forms the background image portion has a 60 ° specular gloss value of 444 in the image portion printed with gold colloid ink, and the second region 4 that forms the latent image portion has infrared absorption. The 60 ° specular gloss value of the image area printed with the ink was 95.5.

When the printed matter of Example 1 is observed with the naked eye in a diffused light region under visible light, the density of the first region 3 as the background image portion and the second region 4 as the latent image portion are almost the same. Therefore, it was difficult to confirm the latent image. When the printed matter is observed with the naked eye in a specularly reflected light region under visible light, a density difference (gloss difference) is generated between the first region 3 as the background image portion and the second region 4 as the latent image portion. The latent image was confirmed. When the diffused light region is observed with the infrared display device, the printed matter has substantially the same density of the infrared display image in the first region 3 as the background image portion and the second region 4 as the latent image portion. The latent image was difficult to check. When the specularly reflected light region is observed with the infrared display device, the printed matter has a density difference between the infrared display image in the first region 3 that is the background image portion and the second region 4 that is the latent image portion. The image could be confirmed.

(Example 2)
An ink jet printer (EPSON PX-G900) is used to form a printed pattern 2 on a photographic paper (EPSON made). The printed pattern 2 includes a first area 3 that forms a background image portion, and a latent image portion. The second region 4 is formed. The first region 3 forming the background image portion is printed with gold colloid ink (manufactured by Nippon Paint Co., Ltd.), and the second region 4 forming the latent image portion is processed ink (cyan, magenta and yellow). The printed matter of Example 2 was obtained. The first region 3 that forms the background image portion has a 60 ° specular gloss value of 444 in the image portion printed with gold colloid ink, and the second region 4 that forms the latent image portion has infrared absorption. The 60 ° specular gloss value of the image area printed with ink was 94.

When the printed matter of Example 2 is observed with the naked eye in a diffused light region under visible light, the density of the first region 3 that is the background image portion and the second region 4 that is the latent image portion are substantially the same. Therefore, it was difficult to confirm the latent image. When the printed matter is observed with the naked eye in a specularly reflected light region under visible light, a density difference (gloss difference) is generated between the first region 3 as the background image portion and the second region 4 as the latent image portion. The latent image was confirmed. When the diffused light area is observed with an infrared display device, the printed material has a density difference between the infrared display image in the first area 3 that is the background image portion and the second area 4 that is the latent image portion. The image could be confirmed. When the specularly reflected light region is observed with the infrared display device, the printed matter has a density difference between the infrared display image in the first region 3 that is the background image portion and the second region 4 that is the latent image portion. The image could be confirmed.

(Example 3)
Using an offset printing machine, a printed pattern 2 is formed on art paper (OK Kanfuji N gloss manufactured by Oji Paper Co., Ltd.). The printed pattern 2 includes a first area 3 that forms a background image portion, a first pattern 3 The second region 4 for forming the latent image portion and the third region 5 for forming the second latent image portion. The first region 3 that forms the background image portion is printed with silver ink (TOPSTAR silver silver manufactured by ECKART), and the second region 4 that forms the first latent image portion is infrared transmission-type special color ink. The third area 5 which is printed by the above and forms the second latent image portion is black ink (UV VECTA carton ink manufactured by T & K TOKA Corporation) / medium (UV VECTA carton medium manufactured by T & K TOKA Corporation). The printed matter of Example 3 was obtained by printing with ink prepared by mixing at a ratio of 15/85. The first region 3 that forms the background image portion has a 60 ° specular gloss value of 90 in the image portion printed with silver ink, and the second region 4 that forms the first latent image portion is The 60 ° specular gloss value of the image area printed with the infrared transmission-type special color ink is 35, and the third area 5 forming the second latent image area is the image line printed with the infrared absorbing ink. The 60 ° specular gloss value of the part was 32.

When the printed matter of Example 3 is observed with the naked eye in a diffused light region under visible light, the first region 3 that is the background image portion, the second region 4 that is the first latent image portion, and the second region Since the density of the third region 5 which is the latent image portion is almost the same, it was difficult to confirm the latent image. When observed with the naked eye in a specularly reflected light region under visible light, the printed material has a density difference (gloss difference) between the first region 3 that is the background image portion and the second region 4 that is the first latent image portion. ) And the latent image could be confirmed. Furthermore, a density difference (gloss difference) was generated between the first region 3 as the background image portion and the third region 5 as the second latent image portion, and the latent image could be confirmed. When the diffused light region is observed with an infrared display device, the printed matter has a density difference between the infrared display image in the first region 3 as the background image portion and the second region 4 as the first latent image portion. The latent image was confirmed. Further, when the diffused light region is observed with the infrared display device, the printed matter has a density of the infrared display image in the first region 3 that is the background image portion and the third region 5 that is the second latent image portion. Since it is almost the same, it was difficult to confirm the latent image. When the specularly reflected light region is observed with the infrared display device, the printed matter has a density difference between the infrared display image of the first region 3 as the background image portion and the third region 5 as the second latent image portion. As a result, the latent image was confirmed. Further, when the specularly reflected light region is observed with the infrared display device, the printed matter has a density in the infrared display image of the first region 3 that is the background image portion and the second region 4 that is the first latent image portion. A difference occurred and the latent image could be confirmed.

Example 4
Infrared absorbing ink A was prepared in the following ratio.
Infrared absorbing ink A
ITO 13.0%
Titanium oxide 16.0%
Carbon black 0.2%
Medium 70.8%

ITO: ITO-A manufactured by Mitsui Kinzoku Co., Ltd.
Titanium oxide: KR-380 manufactured by Titanium Industry Co., Ltd.
Carbon black: MA-100 manufactured by Mitsubishi Chemical Corporation
Medium: UV VECTA carton medium manufactured by T & K TOKA

Next, using an offset printing machine, as shown in FIG. 16, a printed pattern 2 is formed on a base material 1 [matte paper (Satin Kanto N Dalmat manufactured by Oji Paper Co., Ltd.)]. It has the 1st area | region 3 which forms an image part, and the 2nd area | region 4 which forms a latent image part. The first region 3 (halftone dot area ratio 40%) forming the background image portion is printed with the infrared absorbing ink A, and the second region 4 (halftone dot area ratio 40%) forming the latent image portion is The printed matter of Example 4 was obtained by printing with pearl ink (UV Pearl manufactured by T & K TOKA Co., Ltd.).

(Example 5)
As shown in FIG. 16, an offset printing machine is used to form a printed pattern 2 on a base material 1 [Gloss paper (Oji Paper Co., Ltd., OK Kanto N gloss)]. It has a first area 3 to be formed and a second area 4 to form a latent image portion. The first region 3 (halftone dot area ratio 40%) forming the background image portion is printed with the infrared absorbing ink A produced in Example 4, and the second region 4 (halftone dot forming the latent image portion). The area ratio of 40%) was printed with pearl ink (UV Pearl manufactured by T & K TOKA Co., Ltd.) to obtain a printed matter of Example 5.

(Example 6)
Infrared absorbing ink B was prepared at the following ratio.
Infrared absorbing ink B
ITO 13.0%
Titanium oxide 16.0%
Carbon black 0.4%
Medium 70.6%

ITO: ITO-A manufactured by Mitsui Kinzoku Co., Ltd.
Titanium oxide: KR-380 manufactured by Titanium Industry Co., Ltd.
Carbon black: MA-100 manufactured by Mitsubishi Chemical Corporation
Medium: UV VECTA carton medium manufactured by T & K TOKA

Next, using an offset printing machine, as shown in FIG. 16, a printed pattern 2 is formed on a base material 1 [high quality paper (new NPi high quality paper manufactured by Nippon Paper Industries Co., Ltd.)]. It has the 1st area | region 3 which forms an image part, and the 2nd area | region 4 which forms a latent image part. The first region 3 (halftone dot area rate 80%) forming the background image portion is printed with the infrared absorbing ink B, and the second region 4 (halftone dot area rate 80%) forming the latent image portion is The printed matter of Example 6 was obtained by printing with silver ink (UV silver manufactured by T & K TOKA Co., Ltd.).

(Comparative Example 1)
As shown in FIG. 16, an offset printing machine is used to form a printed pattern 2 on a base material 1 [high quality paper (new NPi high quality paper manufactured by Nippon Paper Industries Co., Ltd.)]. It has a first area 3 to be formed and a second area 4 to form a latent image portion. The first region 3 (halftone dot area ratio 60%) forming the background image portion is printed with the infrared absorbing ink B produced in Example 6, and the second region 4 (halftone dot forming the latent image portion). An area ratio of 60%) was printed with silver ink (UV silver manufactured by T & K TOKA Co., Ltd.) to obtain a printed material of Comparative Example 1.

Table 1 shows the 60 ° specular gloss values of the first region 3 forming the background image portion and the second region 4 forming the latent image portion of the printed matter produced in Examples 4 to 6 and Comparative Example 1. The measurement used BYK-Gardner gloss meter micro-TRI-gloss.

In the printed materials of Examples 4 to 6, the first region 3 as the background image portion and the second region 4 as the latent image portion when viewed with the naked eye in the diffuse light region under visible light are shown in FIG. As shown in FIG. 17, since the densities were almost the same, it was difficult to confirm the latent image. When the printed matter is observed with the naked eye in a specularly reflected light region under visible light, the printed region has a density of a first region 3 as a background image portion and a second region 4 as a latent image portion as shown in FIG. A difference (gloss difference) occurred and the latent image could be confirmed. When the diffused light region is observed with the infrared display device, the printed material is the first region 3 as the background image portion and the second region 4 as the latent image portion of the infrared display image as shown in FIG. Since the densities were almost the same, it was difficult to confirm the latent image. When the specularly reflected light area is observed with the infrared display device, the printed material is the first area 3 as the background image portion and the third area 4 as the latent image portion as shown in FIG. As a result, a latent image was confirmed.

When the printed matter of Comparative Example 1 is observed with the naked eye in both the diffused light region and the specularly reflected light region under visible light, the first region 3 that is the background image portion and the first image that is the latent image portion. Since the density of the area 4 of 2 is almost the same, it was difficult to confirm the latent image. Further, when the diffused light region and the specularly reflected light region are observed with the infrared display device, the density of the infrared display image in the first region 3 that is the background image portion and the second region 4 that is the latent image portion is Since the images were almost the same, it was difficult to confirm the latent image.

It is a figure which shows printed matter A1 of this invention. It is a figure at the time of observing the printed matter A1 of this invention with the naked eye in the diffused light area | region under visible light. It is a figure at the time of observing the printed matter A1 of this invention with the naked eye in the regular reflection light area | region under visible light. It is a figure at the time of observing a diffused light area | region with the infrared rays display apparatus of printed matter A1 of this invention. It is a figure at the time of observing a regular reflection light area | region with the infrared rays display apparatus of printed matter A1 of this invention. It is a figure which shows printed matter A2 of this invention. It is a figure at the time of observing the printed matter A2 of this invention with the naked eye in the diffused light area | region under visible light. It is a figure at the time of observing the printed matter A2 of this invention with the naked eye in the regular reflection light area | region under visible light. It is a figure at the time of observing a diffused light area | region with the infrared rays display apparatus of printed matter A2 of this invention. It is a figure at the time of observing a regular reflection light area | region with the infrared rays display apparatus of printed matter A2 of this invention. It is a figure which shows printed matter A3 of this invention. It is a figure at the time of observing the printed matter A3 of this invention with the naked eye in the diffused light area | region under visible light. It is a figure at the time of observing the printed matter A3 of this invention with the naked eye in the regular reflection light area | region under visible light. It is a figure at the time of observing a diffused light area | region with the infrared rays display apparatus of printed matter A3 of this invention. It is a figure at the time of observing a regular reflection light area | region with the infrared rays display apparatus of printed matter A3 of this invention. It is a figure which shows printed matter A4 of this invention. It is a figure at the time of observing the printed matter A4 of this invention in the diffused light area | region under visible light, or the diffused light area | region of an infrared display device. It is a figure at the time of observing the printed matter A4 of this invention in the regular reflection light area | region under visible light, or the regular reflection light area | region of an infrared display device.

Explanation of symbols

A1, A2, A3, A4 Printed matter 1 Paper 2 Print pattern 3 First region 4 Second region 5 Third region

Claims (2)

A printed pattern is formed on a substrate, and the printed pattern has a first printed region that forms a background image portion, and a second printed region that forms a latent image portion,
One of the first print area and the second print area is formed with a metallic gloss ink, and the other is formed with an infrared absorbing ink.
Of the first printing area and the second printing area, an area formed with the metallic gloss ink has a 60 ° specular gloss value of 5.0 or more, an area formed with the metallic gloss ink, and the infrared absorbing ink. The difference in the 60 ° specular gloss value of the region formed with
In the printed matter, the first print area and the second print area are visually recognized in the same color in the diffused light area and in different colors in the specularly reflected light area when observed with the naked eye under visible light. When the printed matter is observed in the specular reflection light region by the infrared display device, the density of the infrared display image in the first print region and the second print region is changed, and the latent image is visually recognized. Printed matter. A printed pattern is formed on a substrate, and the printed pattern has a first printed region that forms a background image portion, and a second printed region that forms a latent image portion,
One of the first print area and the second print area is formed with a metallic gloss ink, and the other is formed with an infrared transmitting ink,
Of the first printing area and the second printing area, the area formed with the metallic gloss ink has a 60 ° specular gloss value of 5.0 or more, the area formed with the metallic gloss ink, and the infrared transmitting ink. The difference in the 60 ° specular gloss value of the region formed with
In the printed matter, the first print area and the second print area are visually recognized in the same color in the diffused light area and in different colors in the specularly reflected light area when observed with the naked eye under visible light. When the diffused light region and the specular light region are observed with the infrared display device, the density of the infrared display image in the first print region and the second print region changes, and the latent image is displayed. Printed matter that is made visible.

Images