JP5652785B2 - Anti-counterfeit printed matter - Google Patents

Description

  The present invention relates to a printed matter requiring prevention of counterfeiting or duplication of banknotes, passports, securities, gift certificates, and various certificates.

  Conventionally, precious printed matter such as banknotes, passports, gift certificates, and various certificates are required to be provided with anti-counterfeit technologies, and various technologies are disclosed for them. For example, a technology such as a paper with a watermark pattern or a thread that gives anti-counterfeiting technology in the manufacturing process of paper as a base material, a technology such as micro-character or pearl printing that gives anti-counterfeiting technology in a printing process, Furthermore, a hologram or laser drilling that gives anti-counterfeiting technology in a separate process after the printing process is representative.

  Among these techniques, as one of the anti-counterfeiting techniques having relatively low cost and high anti-counterfeiting resistance, there is a metameric pair printed matter. Even if the metameric pair printed matter has different spectral reflectances in a wide range of the visible light region, it is visually recognized as a uniform color under a standard light source, and is further observed through a predetermined filter. Therefore, it is visually recognized as a completely different color. These phenomena are called “metamerism”. Using this phenomenon, printed matter that is visually recognized as a uniform color under a standard light source and that forms a pattern using a pair of inks that have different hues under the presence of a filter is called “metameric”. It is called “paired print”.

  Specifically, the configuration of a known metameric pair printed matter will be described with reference to FIG. The printed material 1 ′ in FIG. 19 includes a printed image 2 ′ formed on a base material, and the printed image 2 ′ includes a region 3 ′ printed with the first ink and a region 4 ′ printed with the second ink. When the printed product 1 ′ is viewed under a standard light source, the region 3 ′ and the region 4 ′ are visually recognized as the same color.

  On the other hand, when the printed image 2 ′ is viewed through a predetermined filter, the colors of the region 3 ′ and the region 4 ′ are viewed differently, so that the region 4 ′ can be viewed as a latent image. it can. Therefore, when the printed image 2 ′ is visually recognized through a predetermined filter, a color difference between the region 3 ′ and the region 4 ′ is determined to be genuine, and a color difference that does not occur is regarded as a fake. A technique that can be determined is disclosed (for example, see Patent Document 1).

  Similarly, a discriminating method is disclosed in which one of the regions 3 ′ and 4 ′ appears and the other disappears when viewed through a predetermined filter using the principle and configuration of metamerism. (For example, refer to Patent Document 2).

  Further, similar to the above-described prior art, a technique is disclosed in which, when a metameric pair printed matter is printed on a color copier using the principle and configuration of metamerism, a color difference occurs between the region 3 ′ and the region 4 ′. (For example, see Patent Document 3).

  Accordingly, there are two essential requirements for the known metameric pair printed matter, and the first point is that when the printed image 2 ′ is visually recognized under a standard light source, the region 3 ′ and the region 4 ′ are visually recognized as the same color. When the print image 2 ′ is visually recognized through the filter, the region 3 ′ and the region 4 ′ are visually recognized as different hues. In the present invention, the fact that the region 3 ′ and the region 4 ′ can be viewed as the same color under a standard light source is referred to as “having color matching”. Therefore, if the color matching property is low, the latent image is visually recognized because the region 3 'and the region 4' are visually recognized as different hues even under a standard light source.

  The second point is to provide a difference in reflectance at wavelengths with relatively low visibility. For example, the spectral reflectances of the two inks are standardized by providing a spectral reflectance difference at a wavelength of 620 to 780 nm, which is a wavelength that makes it difficult for humans to perceive color, and matching the spectral reflectances in the other visible light regions. It is to be visually recognized as the same color under the light source. However, even if a wavelength region having a relatively low visibility is used, the spectral reflectances of the first ink and the second ink are different, so that the region 3 ′ and the region 4 ′ are completely color-matched. It is difficult to do this, and there is a problem that the latent image in the region 4 ′ in the printed image 2 ′ is visually recognized even under a standard light source.

  There are three reasons for the above problem, and the first point is that the environment for observing the printed matter 1 'changes to an environment other than that under the standard light source. In producing the printed image 2 ′ of the printed matter 1 ′, the printed matter is prepared by adjusting the colors so as to have color matching under a standard light source, but the actual printed matter 1 ′ is observed under various light sources. Therefore, there is a problem that it is difficult to produce a printed matter having color matching properties under all light sources.

  The second point is that the spectral reflectance varies depending on the thickness of the ink film of the printed material 1 ′. Normally, when producing inks of the same color, the colors are adjusted assuming that the two inks are printed with the same film thickness. Therefore, the first ink and the second ink are assumed to be ideal. However, it is difficult to reproduce the region 3 ′ and the region 4 ′ of the printed material 1 ′ with the ideal spectral reflectance. This is because the amount of ink transferred to the paper varies depending on the printing properties such as ink permeability to the paper, ink flow characteristics, and thermal expansion of the printing machine. is there. For this reason, it is difficult to keep the ink film thickness of the region 3 ′ and the region 4 ′ in the printed material 1 ′ constant, and as a result, the spectral reflectances thereof are different from each other. There is a problem that it is difficult.

  The third point is that there are individual differences in human vision. The metameric pair ink is toned so that the two inks are visually recognized as the same color under a standard light source while providing a difference in reflectance at a wavelength with relatively low visibility. By adjusting the reflectance in the visible light region so as to have color matching, camouflaging the difference in reflectance at a wavelength with relatively low visibility. However, since there is a difference in color perception depending on the difference in the visual perception of the observer, there may be a case where the difference in reflectance at a wavelength with relatively low visibility cannot be camouflaged. For example, when it is evaluated whether or not the same metameric pair printed matter has color matching properties by a plurality of observers, there is a problem that the evaluation results on whether or not the same color matching properties are produced by the observers have a large variation. .

  Further, since the metameric pair printed matter needs to be printed with four process inks (cyan, magenta, yellow, and black) that are used in general color printing except for the area having metamerism, the two metameric pair inks are used. In addition, since it is necessary to use process four-color ink for printing other regions, it is necessary to use a total of six colors of ink, and there is a problem that the number of colors increases.

  Due to these problems, the metameric pair printed matter is not widely used as commercial printing in comparison with pearl printing, fluorescent printing, hologram, or the like.

Japanese Patent Publication No. 60-058711 Japanese Examined Patent Publication No. 61-037636 Japanese Examined Patent Publication No. 63-040677

  The present invention is not a method of using only a pair of inks having the same color to solve each problem of the known metameric pair printed matter, but three types of combinations of the metameric pair ink and the ink having a hue different from the pair ink. A new effect is proposed by using the inks of the three types or using the inks of three different hues.

  The anti-counterfeit printed matter of the present invention has a first area printed with the first ink, a second area printed with the second ink, and a third ink printed with the third ink on at least a part of the substrate. 3 is a printed material on which a printed image is formed, and the first ink, the second ink, and the third ink have different hues, and the first region has a spectral reflectance of 45% or more at a wavelength of 640 nm or more. The second region and the third region have a spectral reflectance of 60% or more at a wavelength of 640 nm or more, and one of the second region and the third region has a wavelength of 640 nm. A first latent image formed of an ink containing a purple pigment having a reflectance of 60% or more and comprising a second region and a third region is formed when the printed matter is viewed under the presence of a predetermined filter. Anti-counterfeit printed matter characterized by having been made.

  Further, the forgery-preventing printed material of the present invention causes the second region or one of the third regions to cause the copy when the printed material obtained by copying the printed material with a color copying machine or the like is viewed under the presence of a predetermined filter. The second latent image is visualized.

  In addition, the above-mentioned copy is characterized in that the spectral reflectance of one of the second region and the third region is not less than 45% at a wavelength of 640 nm or more.

  The predetermined filter used in the forgery-preventing printed material of the present invention is a filter that cuts light having a wavelength of less than 640 nm.

  Moreover, the 2nd area | region or 3rd area | region containing the purple pigment in the forgery prevention printed matter of this invention is characterized by being red, brown, or brown.

  In the forgery-preventing printed matter of the present invention, the hue of the first area and the hue of either the second area or the third area are set to the same color, and the first area, the second area, or the third area The color difference ΔE of the area is 50 or less.

  Further, the forgery-preventing printed matter of the present invention is printed on at least a part of the substrate with the first region printed with the first ink, the second region printed with the second ink, and the third ink. In the printed matter in which the printed image is formed by the third region, the first ink, the second ink, and the third ink have different colors, and the first region has a reflectance of 60% or more at a wavelength of 640 nm or more. The first region is formed of ink containing a violet pigment having a reflectance of 60% or more at a wavelength of 640 nm, and the second region and the third region have a reflectance of 45% or more at a wavelength of 640 nm or more. The first latent image formed of the second region and the third region is formed when the printed material is visually recognized with a predetermined filter. In addition, the first region containing a violet pigment is formed in red, brown, or brown, and the hue of the first region and one of the hues of the second region or the third region are similar colors, The color difference ΔE between the first region and the second region or the third region is 50 or less.

  The forgery-preventing printed matter of the present invention is characterized in that a white line is provided in the boundary between the first region, the second region, and the third region and / or in the region.

  In addition, the forgery-preventing printed matter of the present invention is characterized in that any one selected from a color pattern, a number, a symbol, a mark, and a pattern is formed by a white line.

  The forgery-preventing printed matter of the present invention is characterized in that a white area is formed in any one or two or more areas selected from the first area, the second area, or the third area. Yes.

  The forgery-preventing printed material according to the present invention is a valuable printed material such as a bank note, a passport, and a certificate.

  The anti-counterfeit printed matter of the present invention cannot be viewed with a standard light source by forming a printed image with three types of inks. A first latent image different from that can be visually recognized. Therefore, it is not necessary to have color matching like the metameric pair ink, and the latent image can be camouflaged in any observation environment. Further, a desired latent image can be obtained by printing color management in normal printing without being affected by fluctuations in printing conditions in producing printed matter.

  In addition, a copy obtained by copying the forgery-preventing printed material of the present invention with a color copier can visually recognize a second latent image different from the first latent image when viewed through a predetermined filter. it can. Therefore, a print image that can be viewed under normal light, a first latent image when the print image is viewed through a predetermined filter, and a copy of the print image that is copied through a predetermined filter Thus, since three types of different images of the second latent image when visually recognized can be visually recognized, it is possible to easily determine authenticity.

  Furthermore, although the printed matter of the present invention uses three different types of inks, two of the three different colors of ink can be made into two colors of process four colors, and thus is a conventional metameric pair printed matter. One color can be reduced compared with 6 colors of process 4 colors + metameric pair ink 2 colors.

FIG. 3 is a schematic diagram illustrating an example of a printed material according to the present invention. The figure which shows the spectral reflectance of the printed matter of this invention. The figure which shows the 1st filter image of the printed matter of this invention. The figure which shows the 2nd filter image of the printed matter of this invention. The figure which shows the spectral reflectance of the copy of the printed matter of this invention. The figure which shows the 2nd filter image of the printed matter of this invention. The figure which shows the spectral reflectance of the printed matter of this invention. The figure which shows the 1st filter image of the printed matter of this invention. The figure which shows the 2nd filter image of the printed matter of this invention. The figure which shows the spectral reflectance of the copy of the printed matter of this invention. The figure which shows the spectral reflectance of the printed matter of this invention. The figure which shows the spectral reflectance of the copy of the printed matter of this invention. FIG. 3 is a schematic diagram illustrating an example of a printed material according to the present invention. The figure which shows the 1st filter image of the printed matter of this invention. The figure which shows the 2nd filter image of the printed matter of this invention. FIG. 3 is a schematic diagram illustrating an example of a printed material according to the present invention. The figure which shows the 1st filter image of the printed matter of this invention. The figure which shows the 2nd filter image of the printed matter of this invention. Schematic which shows an example of the conventional printed matter. The figure which shows the 1st filter image of the conventional printed matter.

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

(First configuration)
First, as a first configuration of the printed material of the present invention, a printed image 2 of the printed material 1 will be described with reference to FIG. A region 3, a region 4, and a region 5 to be the print image 2 are formed on the substrate, and the region 3 is printed with the first ink, the region 4 with the second ink, and the region 5 with the third ink. The region 3 is arranged so as to surround the region 4 and the region 5, and the region 4 and the region 5 form a first latent image.

  The “print image” of the present invention is a visible image that can be viewed under a standard light source, and the “first latent image” is a view of the print image 2 through a predetermined filter. The “second latent image” is visualized by visually recognizing a copy obtained by copying the print image 2 of the present invention with a copying machine through a predetermined filter. It is an image.

(Ink and spectral reflectance)
Next, ink and spectral reflectance (hereinafter referred to as “reflectance”) in the printed image 2 will be described. In addition, about the reflectance of this invention, the color development thing with a film thickness of 1 micrometer was produced using the IGT color developing machine by IGT Testing Systems Japan, and the spectrophotometer "U-4100" by Hitachi High-Technologies Corporation. Is used to measure the spectral reflectance.
The first ink, the second ink, and the third ink are composed of inks of different hues, and the reflectances of the region 3, the region 4, and the region 5 after printing are shown in FIG. First, the requirement of the region 3 is that the reflectance at a wavelength of 640 nm or more is less than 45%, preferably less than 40%, and the hue is a blue color, a green color, a brown color, or the like. Even if the reflectance is 30% or less, the effect of the present invention can be obtained, but it is not preferable because it has a dark hue such as black, dark blue, or dark purple, and there are large restrictions in producing the printed material 1.

  Next, the requirement for the region 4 and the region 5 after printing is that the reflectance at a wavelength of 640 nm or more is 60% or more. Preferably, 65% or more is desirable. Furthermore, as another requirement, the ink that prints one of the region 4 and the region 5 does not include a blue color pigment having an absorption characteristic in the vicinity of the wavelength 640 nm, and the blue component is included in the ink. Printing with ink using a purple color pigment with reflective properties. This requirement can provide an anti-counterfeit effect such as a color copier. Examples of purple pigments include quinacridone pink, quinacridone violet, and dioxazine violet. An ink may be prepared by appropriately blending these pigments.

  Further, the hue of the printed image in each region can be arbitrarily set, but region 4 is red, orange or yellow, and region 5 is red, brown or brown. It is desirable to use a system color or the like, and the reverse configuration may be used.

(Visible state of printed image)
As shown in FIG. 1, when the printed material 1 having the region 3, the region 4 and the region 5 is prepared using three kinds of inks, a pattern composed of three different kinds of inks can be visually recognized under a standard light source. it can. At this time, the first latent image is camouflaged by configuring the print image 2 with three different colors.

(First latent image)
Next, when the printed image 2 of the printed material 1 is viewed through a predetermined filter, the first latent image as shown in FIG. 3 can be viewed. The predetermined filter is preferably a filter that cuts light of less than about 640 nm shown in FIG. For example, model number SC64 manufactured by Fujifilm Corporation may be used. Further, the visibility of the first latent image in the state where the filter is interposed is affected by the blue pigment (component) contained in the ink constituting the printed image 2. Specifically, the first latent image is an image in which the blue pigment contained in the ink absorbs light and can be visually recognized as black or brown. If the blue pigment is not contained in the ink, The light is reflected and visually recognized as red. Therefore, an area that can be visually recognized as black or brown appears as a pattern, and a red area that is the same as the filter color disappears and is visually recognized.

  Further, the first latent image can be visually recognized with the reflectance of the wavelength that absorbs light most with respect to the wavelength range of the light transmitted through the filter. Specifically, the hue visually recognized by a filter that cuts light of less than about 640 nm is visualized as black when the reflectance at a wavelength of 640 nm is less than 0 to 35%, and is visualized as brown when less than 35 to 65%. It is visually recognized as red (hue equivalent to a non-printing area) at ˜100%.

  Due to the aforementioned visual recognition principle, the first latent image has a reflectance of about 35% in the region 3 and a reflectance of about 65% in the region 4 and the region 5 near the wavelength of 640 nm. Since the area 4 and the area 5 are visually recognized as red, the area 3 can be visually recognized as brown, and thus the latent image formed of the areas 4 and 5 can be visually recognized. The third ink is toned by using a purple pigment without adding a blue pigment and supplementing a blue component. The latent image may use numbers, characters, symbols, marks, designs, and the like.

(Second latent image)
Next, a case where a copy obtained by copying the printed product 1 with a color copier is visually recognized with a filter interposed therebetween will be described. Note that the color reproducibility performance of recent color copiers is high, and if the color reproducibility does not match in the normal copying mode, the color of the printed matter can be matched by the color adjustment mode. For this reason, even if the print image 2 of the present invention is copied, substantially the same copy can be produced by making full use of the function of the color copier.

  On the other hand, a second latent image obtained by visually recognizing a copy under the filter will be described with reference to FIG. The first latent image in FIG. 3 can be visually recognized as the first latent image because the regions 4 and 5 are visually recognized as red. However, the second latent image in FIG. Since the machine reproduced the hue using a blue-based material in order to reproduce the hue of the region 5, the region 3 and the region 5 are visually recognized as brown, and are different from the first latent image in FIG. It was visually recognized as a latent image. Therefore, since different latent image images are visually recognized in the genuine printed material and the copied material, it is possible to easily determine authenticity.

  These first latent image and second latent image will be described in more detail. The reflectance shown in FIG. 5 is the reflectance of the copy of the printed image 2, and the reflectance before and after copying in the region 3 and the region 4 is substantially the same, but in the region 5, the reflectance after copying is 640 nm or more. Make a big difference. This is a state in which the third ink in the region 5 in the printed image 2 does not use a blue pigment and uses a violet pigment to produce an ink, so that it is difficult to absorb light at 640 nm or more. On the other hand, since the region 5 is reproduced with four process colors in the copy, the purple color of the print image 2 is reproduced with red 80% + blue 20% in the copy image. As a result, in the copy, the region 5 contains a blue component, and the reflectance shows absorption at 640 nm or more.

  Based on the above-described principle, the region 3 and the region 5 in the second latent image have a reflectance of about 35% near the wavelength of 640 nm, while the region 4 has a reflectance of about 65%. Therefore, since the second latent image is visually recognized as the region 4 is red and the regions 3 and 5 are brown, the latent image formed of the region 4 can be visually recognized. As a result, since the visible image of the print image 2, the first latent image, and the second latent image can be viewed as different images, a high level of authenticity determination is possible. When the second ink and the third ink are exchanged in the present embodiment, the first latent image is the same as shown in FIG. 3, but the second latent image is shown in FIG. As shown, the colors change.

  Note that when the third ink in the region 5 is printed without using a violet pigment (for example, red or yellow), the reflectance of the printed material 1 and its copied material does not change. Since the second latent image is the same, the authenticity cannot be determined even if the latent printed image and the copied latent image are compared.

  Moreover, when producing the printed matter 1 of this invention as a color printed matter, generally process 4 colors are used. The first ink of the present invention is a blue color, a green color, or a brown color, and one of the second ink or the third ink is a red color, an orange color, a yellow color, or the like. As the ink, a red color, a brown color, a brown color, or the like can be appropriately selected. Therefore, two colors of the first ink, the second ink, or the third ink can be produced using two colors of the process four colors. Therefore, the printed matter 1 of the present invention can be manufactured with five colors of process 4 colors + 1 color.

(Second configuration)
Next, although the 2nd structure in the printed matter 1 of this invention is demonstrated, description of the method and principle same as a 1st structure is abbreviate | omitted. The second configuration is a configuration in which the ink and the reflectance are different from those of the print image 2, and the effect is also different.

(Ink and spectral reflectance)
With respect to the print image 2 shown in FIG. 1, the printed region 1 is produced by printing the region 3 with the first ink, the region 4 with the second ink, and the region 5 with the third ink. The first ink, the second ink, and the third ink are composed of inks of different hues, and the spectral reflectances of the region 3, the region 4, and the region 5 are shown in FIG. First, the requirements for the area 3 after printing are a wavelength of 640 nm or more and a reflectance of 60% or more. Preferably, it is 65% or more. Furthermore, another requirement is that the ink is printed with an ink using a purple pigment without including a blue pigment in the ink.

  Next, the requirements for the region 4 and the region 5 after printing are that the wavelength is 640 nm or more and the reflectance is less than 45%, and preferably 30 to 40%.

(Visible state of printed image)
When the printed matter 1 shown in FIG. 1 is produced with the second configuration and the printed image 2 is visually recognized under normal light, the color arrangement is different, but is the same as the first configuration.

(First latent image)
When the print image 2 is viewed through a predetermined filter, a first latent image as shown in FIG. 8 can be viewed. Specifically, since the region 4 and the region 5 are visually recognized as brown, while the region 3 can be visually recognized in red, the latent image formed of the region 4 and the region 5 can be visually recognized. . The first ink is an ink that does not contain a blue pigment and supplements a blue component with a purple pigment.

(Second latent image)
On the other hand, FIG. 9 shows a second latent image when the copy is viewed with the filter interposed. At this time, since the first latent image shown in FIG. 8 and the second latent image shown in FIG. 9 are different, authenticity determination can be performed. The reason for this is that the reflectance of the copy shown in FIG. 10 is substantially the same before and after copying in the regions 4 and 5, whereas in the region 3, the reflectance before and after the copying at a wavelength of 640 nm or more. It can be seen that there is a big difference. As a result, in the second latent image, the reflectance in the vicinity of the wavelength of 640 nm absorbs light most about 35 to 40% in the regions 3, 4 and 5, and all the regions are visually recognized as brown. Therefore, in the second configuration, the authenticity determination can be performed by the difference between the first latent image and the second latent image.

  Therefore, in both the first configuration and the second configuration, the first latent image and the second latent image can be different from each other. Therefore, either one may be selected as necessary. The printed material of the first configuration or the second configuration does not need to have color matching like the conventional metameric printed material, and can be easily produced by normal printing color management by configuring with three different colors. it can. Further, the first latent image cannot be recognized in any observation environment. In addition, when the printed matter of the present invention is produced by color printing, the number of colors can be reduced, and a method for determining authenticity of a new copy can be proposed.

  The printed material of the present invention is suitable for valuable printed materials such as banknotes, passports and certificates.

In Example 1, a printed material was produced according to the first configuration described above. In Example 1, the first ink was blue, the second ink was orange, and the third ink was red, and a printed image 2 shown in FIG. 1 was produced. Further, FIG. 2 shows the reflectances in the regions 3, 4 and 5 printed with the first ink, the second ink, and the third ink, and FIG. Shown in Since the visible image, the first latent image in FIG. 3 and the second latent image in FIG. 4 in the printed image in FIG. 1 are different from each other, advanced authenticity determination can be performed.
In addition, the printed matter 1 of Example 1 produced the printed matter using the white high quality paper for the base material, and using the offset printing machine. The three types of inks were appropriately adjusted so as to have respective reflectances, and the filter image was an image with a filter having the reflectance shown in FIG. 2 interposed.

  In the second embodiment, a configuration in which the first latent image can be more camouflaged in the print image 2 under normal light will be described. Specifically, two colors of the first ink, the second ink, or the third ink are set to similar colors. For example, a printed image 1 shown in FIG. 1 was prepared using brown for the first ink, orange for the second ink, and red for the third ink. In the second embodiment, the region 3 and the region 5 have similar colors, but the color difference ΔE is 50 or less, preferably the color difference ΔE is 35 or less. FIG. 11 shows the reflectance of each of the regions 3, 4 and 5 printed with the first ink, the second ink, and the third ink, and FIG. 12 shows the reflectance of a copy of the printed image 2. Indicates. At this time, as shown in FIG. 3 and FIG. 4, since the first latent image and the second latent image are different from each other, a high level of authenticity determination can be performed.

  Next, the printed matter 1 of Example 3 produced by the second configuration described above will be described. In Example 3, red was used as the first ink, blue was used as the second ink, and green was used as the third ink, and a printed image 2 shown in FIG. 1 was produced. FIG. 7 shows the reflectance of each of the regions 3, 4 and 5 printed with the first ink, the second ink, or the third ink, and FIG. 10 shows the reflectance of a copy of the printed image 2. Indicates. At this time, as shown in FIGS. 8 and 9, since the first latent image and the second latent image are different, advanced authenticity determination can be performed.

  In Example 4, a printed matter was produced as a configuration in which the first latent image was more camouflaged in the printed image 2 under normal light. Although either the first configuration or the second configuration may be used, Example 4 will be described as a printed matter using the first configuration.

  As shown in FIG. 13, the printed matter of Example 4 has white lines 6 (printed with white ink or formed as non-printed areas in the boundaries and / or areas of the areas 3, 4, and 5. Part). By providing the print pattern 2 with the chromatic pattern by the white line 6, new information (design) is added and the first latent image can be camouflaged. The line width of the white line is preferably from 0.1 to 1.0 mm, and the pattern by the white line is preferably a striated pattern, a number, a symbol, a mark, a pattern, or the like. Further, as shown in FIGS. 14 and 15, even if the white line 6 is provided in the print image 2, a high degree of authenticity can be achieved without impairing the visibility of the first latent image and the second latent image. It was possible to make a decision.

  In Example 5, in addition to the configuration of Example 4, as shown in FIG. 16, white areas are provided in the areas 3, 4, and / or 5. For example, a part of the region 3 and the whole region 4 are set not to be solid but to have a white region. The outline region is not limited in shape, such as a line shape, a dot shape, a mesh shape, or a lattice shape. By providing a white area in the print image 1, it is possible to provide a density difference in the print image 1 and further camouflage the first latent image. FIG. 17 shows the first latent image, and FIG. 18 shows the second latent image. In particular, the authenticity of the latent image was not impaired, and advanced authenticity determination could be performed.

  Next, the optimal arrangement of the white areas will be described. If the base color is white, the second latent image in the white area in the white area can be visually recognized as red. For example, as in the second latent image (region 4) in FIG. 18, if the reflectance of the copy having a wavelength of 640 nm or more is 60% or more, both the copy image and the white portion are visually recognized as red. Therefore, the visibility of the latent image is not affected. Therefore, it is desirable to provide a white portion in the region 4. On the other hand, if the reflectance at a wavelength of 640 nm or more in the copied material is less than 45% as in regions 3 and 5, the copied image is visually recognized as brown and the white portion is visually recognized as red. Reduce. Therefore, if the second latent image (region 4) is arranged in a region that is not in contact with the second latent image, the visibility of the latent image is not lowered. For example, it is desirable to provide a distance of 3 mm or more between the second latent image (region 4) and the white region.

DESCRIPTION OF SYMBOLS 1, 1 'Print 2, 2' Print image 3, 3 '1st area | region printed with 1st ink 4, 4' 2nd area | region printed with 2nd ink 5 1st area | region printed with 3rd ink 3 area background area 6 white line

Claims (11)

A printed image is formed on at least a part of the substrate by a first region printed with the first ink, a second region printed with the second ink, and a third region printed with the third ink. Printed material,
The first ink, the second ink, and the third ink have different hues,
The first region has a spectral reflectance of a wavelength of 640 nm or more of less than 45%,
The second region and the third region have a spectral reflectance of 60% or more at a wavelength of 640 nm or more, and one of the second region and the third region is a purple pigment Formed with ink containing,
An anti-counterfeit printed matter, wherein a first latent image formed of the second region and the third region is formed when the printed matter is viewed with a predetermined filter interposed therebetween.   The forgery-preventing printed matter according to claim 1, wherein the predetermined filter is a filter that cuts light having a wavelength of less than 640 nm.   The forgery-preventing printed matter according to claim 1 or 2, wherein the second region or the third region containing the purple pigment is red, brown, or brown. A printed image is formed on at least a part of the substrate by a first region printed with the first ink, a second region printed with the second ink, and a third region printed with the third ink. Printed material,
The first ink, the second ink, and the third ink are different in color,
The first region has a reflectance of 60% or more at a wavelength of 640 nm or more, and the first region is formed of an ink containing a purple pigment,
The second region and the third region have a reflectance of less than 45% at a wavelength of 640 nm or more,
A forgery-preventing printed material, wherein a first latent image formed of the second region and the third region is formed when the printed material is viewed with a predetermined filter. The anti-counterfeit printed matter according to claim 4, wherein the reflectance of the predetermined filter cannot visually recognize light having a wavelength less than 640 nm. 6. The forgery-preventing printed matter according to claim 4 , wherein the first region containing the purple pigment is red, brown, or brown. Said first region, said second region and anti-counterfeit printed matter according to any one of claims 1 to 6, wherein the provision of the white lines on the boundary of the third region and / or region. 8. The forgery-preventing printed material according to claim 7 , wherein the white line forms any one selected from a color pattern, a number, a symbol, a mark, and a design. Wherein the one region of the do not contain a purple pigment second region or the third region, anti-counterfeit printed matter according to any one of claims 1 to 3, characterized in that to form a white area . 7. The forgery-preventing printed matter according to claim 4 , wherein a white area is formed in the second area and / or the third area not including the purple pigment. 8. 11. The forgery-preventing printed matter according to claim 9 , wherein the white area is disposed outside the area where the first latent image is formed.

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