JP6124081B2 - Anti-counterfeit printed matter - Google Patents

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matters that require anti-counterfeiting effects, the present invention transmits images that have been viewed under reflected light. It relates to anti-counterfeit printed matter that disappears under light.

  Recent advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce elaborate copies of precious printed matter. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeit technologies that cannot be reproduced by a printer or a copier are required.

  As one of the anti-counterfeiting techniques, there is a so-called watermarking technique in which a pattern is formed by the thinness of the paper and the density of the fibers so that the pattern is visually recognized under transmitted light. This watermark technology is a technology that can authenticate in any environment as long as there is more than a certain amount of light, and it is also a classic technology that has existed since ancient times because it is well known. Nevertheless, it is still used on banknotes around the world.

  Since the watermark technology must be formed at the paper manufacturing stage, it cannot be manufactured by a paper manufacturer. In addition, even if the paper manufacturer manufactures it, there is a problem that the manufacturing cost increases. As a method for reproducing the image, there is a forgery prevention technique in which a transmission image corresponding to the watermark is formed by printing using a special penetrating ink in a printing process (see, for example, Patent Document 1).

  However, with regard to anti-counterfeiting technology using watermark printing that authenticates a transmitted image such as a watermark under transmitted light using penetrating ink, penetrating ink itself is commercially available from many manufacturers, Since it is also readily available, there is a problem that it is easy for a counterfeiter to produce.

  In order to solve such a problem, the present applicant has already made a special and complicated network using a colored penetrating ink in which a coloring material is mixed with a penetrating ink and a reflecting ink paired with the colored penetrating ink as a pair ink. An application has already been filed for a transmission latent image print that forms an image by dot composition, and the image can be observed under reflected light and the image that can be observed under transmitted light are completely different from each other. (For example, refer to Patent Document 2).

JP-A-6-228900 JP 2012-223905 A

  The technology described in Patent Document 2 is a technology that uses a colored penetrating ink obtained by adding a coloring material to a penetrating ink having a penetrating component, and uses an image having a density that can be visually recognized even under visible light as a constituent element of the invention. . In this technique, an image formed with a colored penetrating ink exhibits an effect that the color changes lightly under transmitted light. However, the image formed with the colored penetrating ink used in the technique of Patent Document 2 changes lightly, but has not yet achieved an effect that the image itself disappears completely.

Whether the image is visible or not visible is easily verbalized and can be easily determined by everyone, but the degree of lightness and shade of the image (lightness level) is appropriate. It is difficult to verbalize. A dedicated measuring instrument is required to show the light and shade in absolute quantities such as reflection density and brightness. For this reason, in the technique of Patent Document 2, normal color ink of the same color as the colored penetrating ink is not used as a criterion for authenticity discrimination, because the change in density of the image formed with the colored penetrating ink under the transmitted light itself is not used. The paired ink is used as a pair ink, and a latent image is made to appear by a method of relativizing the difference in density under transmitted light between the paired inks, and whether or not the latent image appears is used as a criterion for authenticity determination. As described above, although the technique of Patent Document 2 is an excellent technique for visualizing a latent image under transmitted light, it requires another ink in addition to the colored penetrating ink, and has a complicated halftone dot. There was a problem that composition and advanced printing were necessary.

  In addition, an image formed using colored penetrating ink in the technique of Patent Document 2 requires an information part representing significant information and a background part surrounding the background. This is because, if an image of only the information part is formed using the conventional colored penetrating ink, significant information of the information part is visually recognized even under transmitted light, so an image is provided with a background part surrounding the information part. This is because the information portion in the image is lost under transmitted light by limiting the overall gradation (however, in the prior art, the information portion in the image is assimilated with the background portion). It disappears and does not cause the image itself to disappear). As described above, by providing the information part representing the significant information and the background part surrounding the information part, the effect of erasing significant information in the image under transmitted light is enhanced. There is a problem that the presence lowers the contrast of the information part and the visibility is lowered.

  The present invention aims to solve the above-described problems, and is an image formed using a colored penetrating ink, and the image is formed under transmitted light as in an image formed using a conventional colored penetrating ink. Not only the brightness changes but also the anti-counterfeit printed matter with the first printing area that realizes the effect that the image is completely equal to the color of the base material and disappears, and the image under reflected light The present invention relates to a forgery-preventing printed matter having a first printing region excellent in authenticity discrimination, characterized by high visibility.

The present invention has the same hue as that of the base material, which is formed of a color penetrating ink containing a coloring material and a penetrating component on at least a part of the colored base material having light transmittance, and more than the color of the base material. It has a printed pattern having at least a first print area having a color with low lightness, and the first print area is visually recognized in a different color depending on the lightness difference from the substrate under reflected light. The anti-counterfeit printed matter is characterized by being visually recognized in the same color as the base material under transmitted light and cannot be classified.

According to the present invention, the printed pattern has a second print area that is the same color as the first print area that is formed of the ink that does not include the penetrating component and that is disposed adjacent to and / or close to the first print area. The first print area is visually recognized as the same color as the second print area under reflected light and cannot be separated under the transmitted light as the same color as the base material. It is a forgery-preventing printed matter characterized by being classified and visually recognized by the difference in the amount of transmitted light and the substrate.

The present invention is the anti-counterfeit printed matter, wherein the lightness L * of the first printing region is 60 or more and 95 or less.

  The present invention is the anti-counterfeit printed matter, wherein the first printing region is achromatic when the substrate is white.

  In the first printing area of the forgery-preventing printed matter of the present invention, the image is completely lost when watermarked. Unlike the determination of “quantity” such as shading, the determination of “presence / absence” that “image is present (not disappeared)” or “image is absent (disappeared)” requires a measuring instrument for everyone. It is a standard that can be determined without making it easy to explain. Therefore, even if the image is simply formed with one color of ink, it can be used as a criterion for authenticity determination by using “presence / absence of image” under transmitted light as a reference.

  The first printing area in the forgery-preventing printed matter of the present invention does not require a structure surrounding an information part representing significant information as in the background part of the prior art, and it is not necessary to limit the area ratio. An image can be composed of only significant information desired. For this reason, the visibility of the image under reflected light can be kept high.

  The first printing area in the anti-counterfeit printed matter of the present invention is an image formed by a general printing method without using a special functional pigment. When constructing an image, there is no need for design restrictions, area ratio restrictions, substrate irregularities, etc., which are necessary for general anti-counterfeiting technology, and there is no sense of incongruity about gloss. Even if observed, it is indistinguishable from an image composed of normal ink. As described above, in spite of the anti-counterfeiting technology, the degree of freedom in design and the affinity with other designs are remarkably high, and it can be arranged in the security printed material without a sense of incongruity.

Since it is only necessary to print with a specific colored penetrating ink, it can be manufactured very easily. The printing method is also extremely cost effective because it can be formed in a single color by offset printing with the highest productivity.

  The colored penetrating ink required to form the first printing area in the anti-counterfeit printed matter is not generally sold like penetrating ink, and has a certain knowledge about the production of ink. Because it is necessary, it is superior in counterfeit resistance as compared with penetrating ink.

  The anti-counterfeit printed matter formed by the above method is excellent in the anti-counterfeit effect because the effect cannot be reproduced even if the latest digital equipment is used.

The forgery prevention printed matter in this invention is shown. The effect of the forgery prevention printed matter in this invention is shown. The observation conditions under the transmitted light of the forgery prevention printed matter in this invention are shown. The forgery prevention printed matter which has a printed pattern in this invention is shown. The structure of the printing pattern in this invention is shown. The effect of the forgery prevention printed matter in this invention is shown.

    DESCRIPTION OF EMBODIMENTS 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 described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

(First embodiment)
In FIG. 1, the forgery prevention printed matter (1) in this invention is shown. The anti-counterfeit printed matter (1) is formed by forming a first printing region (3) having a color different from that of the base material (2) on the base material (2).

  The base material (2) for forming the forgery-preventing printed matter (1) in the present invention needs to have a light-transmitting property, so-called light transmittance, such as high-quality paper, coated paper, transparent film, and plastic. With opaque plastic or metal, the effect under transmitted light cannot be obtained. There is no restriction | limiting in particular about the color of a base material (2). Moreover, the color of the 1st printing area | region (3) needs to be a color with the same hue as a base material (2), and a lightness lower than the color of a base material (2).

  The first printing region (3) represents specific information, has the same hue as the base material (2), has a lightness lower than the color of the base material (2), and is a colored penetrating ink. As long as the image is formed using, there is no restriction on the dot area ratio in the image configuration. That is, it may be formed using any gradation from the maximum to the minimum that can be formed with the colored penetrating ink, and may be formed with any dot area ratio from 0% to 100%. A multi-gradation image having a plurality of complex gradations as shown in FIG. 1 may be configured, or a simple image, a character, or the like may be a binary image that is solid. Note that the information represented by the first print area (3) of the first embodiment is an image of the 36 scenes of Togashi “Kanagawa-Okinami” (hereinafter referred to as “the image of a nami”).

Here, the colored penetrating ink will be described. The colored penetrating ink used in the conventional invention such as Patent Document 2 can form an image having a clearly visible color under reflected light when printed on the substrate (2). On the other hand, it has the effect of changing the image extremely lightly under transmitted light. In other words, it is an ink having the effect of “the image looks lighter when seen through” as compared with a normal colored ink. Colored penetrating ink is composed of penetrating component and coloring material, and realizes the effect that the image looks faint due to the increase in transmittance caused by the penetrating component suppressing the scattering of light inside the substrate. .

  The colored penetrating ink used in constructing the present invention is an ink that has enhanced this effect, and further enhances the effect of changing the image lightly under the transmitted light of the conventional colored penetrating ink. This is an ink that achieves the effect. In realizing this effect, a contrivance is provided with respect to the color of the first print region (3), and the color has the same hue as that of the base material (2) and a lightness lower than that of the base material (2). For this reason, the colored penetrating ink forming the first print region (3) also has the same hue as the color of the base material (2) and has a lightness (dark) than the color of the base material (2). The ink has a color.

  Specifically, if the base material (2) is white, the colored penetrating ink has the same white hue as the base material (2) (in this specification, white and black achromatic colors also have one hue). ) And having a lower lightness than the color of the base material (2), that is, gray (or black if the lightness is extremely lowered). In addition, it is not always necessary that the lightness is low, and it is necessary to adjust the lightness to an appropriate lightness according to the rate of increase in transmittance due to the penetrating component. That is, the brightness is lower when it has a better penetration effect compared to a general penetration component, and slightly higher when the penetration effect is low (but lower than the brightness of the base material). ), The brightness needs to be adjusted. As an example, when the first printing region (3) is formed with colored penetrating ink using penetrating ink having general performance in offset printing as the penetrating component, the lightness L * is 60 or less and the reflection density is zero. Since the first print area (3) of .5 or more cannot be completely lost under transmitted light, it is necessary to avoid the lightness below this. Desirably, the brightness L * is 70 or more and the reflection density is 0.3 or less. In addition, if the image is too light, an image that is visible under reflected light cannot be formed. Therefore, it is necessary to set the brightness L * 95 or less and the reflection density to 0.05 or more, and desirably the brightness L * is 90 or less and the reflection density is 0. .1 or more.

FIG. 2 shows the effect of forming the first printed region (3) by printing the gray colored penetrating ink adjusted to an appropriate lightness on the substrate (2). When the anti-counterfeit printed matter (1) is observed under reflected light as shown in FIG. 2 (a), the first printed region (3) representing a wavy image with a gray color can be visually recognized. On the other hand, as shown in FIG. 2 (b), when the anti-counterfeit printed matter (1) is observed under transmitted light, the image of the wave is equalized with the base material (2) and completely disappears, and the base material (2 ) Only visible. As described above, the first print region (3) of the present invention is characterized by being visible under reflected light and disappearing under transmitted light.

  A description will be given of the principle that the first print region (3) that has been visually recognized with a certain shading under reflected light disappears under transmitted light. The first printing region (3) is formed by printing with a colored penetrating ink containing a penetrating component and a coloring material having a color darker than the color of the base material (2). The penetrating component contained in the colored penetrating ink is composed of a resin close to the refractive index (1.49) of the cellulose fiber constituting the paper, and when printed on the base material (2), the inside of the base material (2) It fills the gap between the cellulose fibers and fills it with a penetrating component (resin). By forming a uniform space with no change in the refractive index inside the paper in this way, light that has been refracted at the boundary between the cellulose fiber and the gap until then can travel straight and pass ( As a result, the amount of light transmitted increases, resulting in an effect that looks brighter. On the other hand, the color penetrating ink contains a color material. This coloring material functions to absorb light. As light is absorbed, it cannot enter or transmit inside the paper, and as a result, the amount of light incident and transmitted is reduced, resulting in an effect of appearing dark.

  Since the amount of light whose transmitted light amount is increased by the penetrating component and the amount of light whose transmitted light amount is decreased by the color material can be controlled and adjusted, transmission passing through the first printing region (3) is possible. The amount of light and the amount of transmitted light passing through the substrate (2) can be made equal to the lightness of the substrate (2) and the first printing region (3). Here, if the hue of the substrate (2) and the hue of the first printing region (3) are different as in the conventional colored penetrating ink, even if the brightness matches, the first The print region (3) cannot be equalized with the base material (2), and the effect of completely disappearing the image under transmitted light cannot be obtained. In the present invention, the hue of the substrate (2) and the hue of the first printing region (3) are the same hue, so that the first printing region (3) and the substrate (2) under transmitted light. When the lightness of the same is made, the same color as that of the base material (2) is obtained, and an effect of visually erasing the first printing region (3) is produced. In the present invention, the disappearance effect of the first print area (3) is realized by the above principle.

  Note that the effect of disappearance of the first print region (3) depends on the state of light in the observation environment because transmitted light is used. Naturally, the disappearance effect is enhanced when strong light is used as transmitted light, but the disappearance effect is reduced when the light is weak. In addition, the disappearance effect of the first print area (3) is not affected only by the intensity of light incident from the back side of the printed matter as transmitted light, but by the intensity of light incident as reflected light from the front side of the printed matter. Are affected at the same time. In order to explain each influence concretely, the figure which observes the forgery prevention printed matter (1) of this invention in a specific environment in FIG. 3 is shown.

  FIG. 3 is a diagram in which the effect of the first print region (3) of the present invention is visually recognized using the light table (8) in an environment according to an actual office. If the lightness L * of the first printing area (3) is about 85 to 80, the first printing area (3) of the present invention has an incident light (4R) from the light source (4) of 10 lx or less. If the transmitted light (4T) at the table top of the light source (4 ′) of the light table (8) has an illuminance of 1000 lx or more, an extinction effect occurs. In an environment where the incident light (4R) conforms to the brightness on a normal office desk has an illuminance of about 300 lx, the transmitted light (4T) needs an illuminance of 2000 lx or more to completely erase the image. Become. In a very bright environment where the light source (4) exceeds an illuminance of 600 lx, the transmitted light (4T) needs an illuminance of 3500 lx or more to completely erase the image. As described above, according to the illuminance of the incident light (4R), the illuminance of the transmitted light (4T) necessary for erasing the image changes. Basically, when light having an illuminance of 3500 lx or more is used as transmitted light, it is possible to reliably determine authenticity in an environment according to a general office.

  The illuminance of 3500 lx is a general value as the illuminance at the table top of a commercially available light table, and by using such a light table, it is possible to reliably determine authenticity. In addition, this level of illuminance is the level of illuminance obtained at a distance of about 20 to 30 cm from a general fluorescent lamp in an office. The authenticity may be determined using. If the ceiling is high and the distance to the fluorescent light is long and it is difficult to place the anti-counterfeit printed matter (1), a general desk light is prepared on the desk and the anti-counterfeit printed matter (1) It is possible to make a true / false determination with certainty.

  If the above-described conditions cannot be satisfied, the lightness of the first print area (3) may be designed to be slightly high (reflection density is low). In addition, since the brightness level of the first print area (3) and the disappearance effect are proportional to each other, the brightness of the first print area (3) can be increased even in an environment without sufficient illuminance. An elimination effect can be obtained. For example, even if the first print area (3) formed at a brightness of about 85 under a certain lighting environment does not disappear under transmitted light, if the brightness of the first print area (3) is increased to a brightness of about 90, Although the resistance to counterfeiting is somewhat reduced, in most cases the first print area (3) can be lost under transmitted light.

  On the other hand, if it is not possible to secure light with an appropriate illuminance and do not want to reduce the resistance to forgery, or if the brightness of the first print area (3) cannot be increased due to design reasons, As in the example shown in the second embodiment, a printed material that is paired with an image formed with normal ink, and the true / false determination is made based on the difference in shading between the two paired images by relativizing the effect. It is also good. As described above, the first print area (3) of the present invention functions as a true / false discrimination element under any environment as long as light with a certain illuminance exists.

  In the present invention, “observation under reflected light” means that the observer's viewpoint is in the diffuse reflected light region where diffuse reflected light is dominant, and the anti-counterfeit printed matter (1) is observed under visible light. In the present invention, “observation under transmitted light” means that the observer's viewpoint is in the area under transmitted light and the anti-counterfeit printed matter (1) is observed. ing.

In addition, the brightness in this specification refers to the brightness of a color, and when it is high, it is bright, and when it is low, it is dark. Saturation refers to the degree of color vividness. In addition, “color” in the present invention represents a color including the concept of hue, saturation, and lightness, and “hue” refers to a color aspect such as red, blue, and yellow. Specifically, the intensity distribution of a specific wavelength in the visible light region (400 to 700 nm) is shown. In the present specification, in particular, white and black are also considered as one hue. The “same hue” in the present invention means that the color appearances of red, blue, and yellow are the same in the two colors, and the wavelength intensity distribution in the visible light region has a correlation in the two colors. Therefore, in the present specification, white, gray, and black achromatic colors are considered to have the same hue.

The penetrating component in the present invention refers to a component that functions to increase the transmittance of the printing region by penetrating into the paper during printing. Specifically, the refractive index of cellulose (1.49) Refers to resin, wax, animal and vegetable oils, etc. In addition, the color of the “colored base material” in the present specification is not limited to the color of the paper itself that is the base material, but refers to the color of the background in contact with the printed pattern (3) of the present invention. That is, when a printing layer or a spray layer using a color material having a color different from that of the base material is formed between the base material (2) itself and the printed pattern (3) of the present invention, the present specification The color of the base material means not the color of the base material itself but the color formed by the printing layer or the spray layer. Needless to say, white and black are also included in the color of the “colored substrate”.

  Further, the “penetrating ink” in the present invention refers to an ink that contains the aforementioned penetrating component and is generally sold as a watermark ink. Examples of such inks include Best One Watermark Ink from T & K TOKA, UV Watermark Ink from T & K TOKA, Unimark from Teikoku Ink, and SMX Water Ink from Toyo Ink. , E2 varnish manufactured by Joint Ink Co., Ltd. exists. Also, if it is transparent and has a low viscosity, a certain watermark effect can be expected even with inks similar to general gloss varnish and overprint varnish, so the penetration effect is lower than the above-mentioned watermark ink. However, colored penetrating inks can be made. The color material mixed with the colored penetrating ink may be a printing color material sold as a color pigment or a color dye. For the purpose of distributing to the market as printed matter, it is desirable to use a color pigment that is easy to obtain long-term fastness.

  In addition, for the purpose of ascertaining the occurrence of reprinting and printing defects in colored penetrating inks or for the purpose of improving authenticity discrimination, luminescent pigments and luminescent dyes such as fluorescent pigments, fluorescent dyes, phosphorescent pigments, and phosphorescent pigments Even if functional materials such as an infrared absorbing material and an infrared reflecting material are added, there is no problem.

  The printing method of the anti-counterfeit printed matter (1) of the present invention exhibits a sufficient effect by offset printing, but may be formed by flexographic printing, gravure printing, intaglio printing, screen printing, etc. according to the manufacturer's seeds. .

  In the first embodiment, the anti-counterfeit printed matter (1) is configured only by the first printing region (3) with the colored penetrating ink. The first printing region (3) and another image element are combined. Thus, an anti-counterfeit printed matter (1) with higher authenticity discrimination and visibility may be formed. The specific method will be described below as the second embodiment.

(Second embodiment)
FIG. 4 shows an anti-counterfeit printed matter (1 ′) according to the second embodiment. The anti-counterfeit printed matter (1 ′) is formed by forming a printed pattern (6 ′) having a color different from that of the base material (2 ′) on the base material (2 ′).

  FIG. 5 shows an outline of the configuration of the printed pattern (6 ′). The print pattern (6 ′) has a first print area (3 ′) formed of colored penetrating ink and a second print area (7 ′) adjacent to the first print area (3 ′). As long as the second printing region (7 ′) is an image formed of a material other than the colored penetrating ink, there are no restrictions on the constituent material and the forming method. There are no particular restrictions on the structure of the two images as long as they are adjacent to each other, but if the colors of the two images are the same color, or if the two images are combined to represent significant information, It is desirable because the effect at the time of light transmission is easily discriminated and the authenticity discrimination is enhanced. In the second embodiment, the two images of the first print area (3 ′) and the second print area (7 ′) constituting the print pattern (6 ′) are the same color, and An example in which two images are combined to represent information on cherry blossom petals will be described.

  If the second printing area (7 ') formed of ink other than the colored penetrating ink has a particularly low light-transmitting property, the first printing area (3') and the second printing area (2 ') can be used when transmitting light. This is more desirable because the contrast of the print area (7 ′) is increased and the disappearance effect of the first print area (3 ′) is relatively emphasized.

  As a material that can reduce the light transmittance of the image, specifically, an ink containing a metal pigment having high light reflectivity such as titanium dioxide, iron oxide, zinc oxide, aluminum oxide, or the like is used. An ink containing silicon dioxide, calcium carbonate, or the like can also be used. Or you may make light transmittance low by printing with a thick film thickness using the general ink which does not contain a special metal pigment.

FIG. 6 shows the effect of the anti-counterfeit printed matter (1 ′) provided with the printed pattern (6 ′). As shown in FIG. 6A, when the anti-counterfeit printed matter (1 ′) is observed under reflected light, the petal of cherry blossoms composed of the first printed region (3 ′) and the second printed region (7 ′). Can be visually recognized. On the other hand, as shown in FIG. 6B, when the printed matter (1 ′) having the printed pattern (6 ′) is observed under transmitted light, the first printed region (3 ′) of the printed pattern (6 ′) is obtained. ′) Equalizes with the base material (2 ′) and disappears completely, and only the second print region (7 ′) having no disappearing effect is visually recognized. As described above, the anti-counterfeit printed matter (1 ′) provided with the printed pattern (6 ′) of the present invention is characterized in that the pattern visually recognized under reflected light and transmitted light changes. Further, even when the sufficient illuminance cannot be obtained under transmitted light, the first print area (3 ′) does not completely disappear but changes very lightly, and the second print area A remarkably large density difference occurring between (7 ') and the image can be visually recognized, and authenticity can be determined by visually observing this effect.

  Thus, the reason for forming the print pattern (6 ′) by combining the first print region (3 ′) and the second print region (7 ′) is as follows. The first printing region (3 ′) has an excellent disappearance effect, but the effect changes depending on the amount of light in the observation environment as described above. That is, when there is direct sunlight having an illuminance appropriate for the observation environment, a light source such as a fluorescent lamp or a light table in a general office, the first printing region (3 ′ ) Disappears completely, but only indirect lighting, and in a dark room where adequate illuminance cannot be ensured, although it varies slightly depending on its density, it may not disappear completely. Thus, in order to cope with the case where the effect is influenced by the illumination condition of the observation environment, the second print region (7 ′) formed by other than the colored penetrating ink paired with the first print region (3 ′). ) In the vicinity of the first print area (3 '), the effects can be relativized. As a result, even if the first print area (3 ′) does not disappear completely in a dark room where there is no direct incident light and only indirect illumination, it is more than the second print area (7 ′). By confirming that the color has changed to a pale color, it is possible to make a genuine authenticity determination. As described above, the first print area (3 ′) can be used as a part of the pair image as in the conventional technique. Moreover, even if it is a printed pattern (6 ') of such a form, compared with the printed pattern (6') formed using the conventional type colored penetrating ink, the effect that an image changes lightly is higher, Since the effect can be visualized by making it more relativistic, the authenticity discrimination ability is higher than that of the conventional printed pattern (6 ′).

  Only the form which forms two images of the 1st printing field (3 ') and the 2nd printing field (7') on the one side surface of a substrate (2 ') like the example of a 2nd embodiment. Instead, the first printing area (3 ') is formed on the surface of the base material (2'), and the second printing area is located at the same position across the base material (2) on the back surface of the base material (2 '). If (7 ′) is formed, only the first print area (3 ′) can be seen under reflected light, and only the second print area (7 ′) existing on the back surface can be seen through under transmitted light. It is also possible to adopt a form having an image change effect. In this case, if the second printing region (7 ′) has the same color as the base material (2 ′), the presence of the second printing region (7 ′) is not known when viewed from the back surface, and functions as a latent image. desirable.

  Moreover, the colored penetrating ink of the present invention is used for a latent image printed material of a type in which an image is changed to different information having no correlation at all under reflected light and transmitted light as shown in JP 2012-223905 A. May be. Unlike the conventional color penetrating inks, the colored penetrating ink of the present invention completely disappears under transmitted light, so that the visibility of the latent image under the transmitted light is further improved, and the authenticity discrimination is markedly improved. To improve.

  As described above, the configuration of the forgery-preventing printed matter including the first printing region of the present invention can take various forms. Hereinafter, according to the best mode for carrying out the invention described above, an example of a printed matter having a first printed region that is specifically produced will be described in detail. However, the invention is not limited to this example. It is not something.

  This embodiment will be described with reference to FIGS. 4 to 6 by using the same form as that described in the second embodiment. FIG. 4 shows an anti-counterfeit printed matter (1 ′) having a printed pattern (6 ′) in the embodiment. The anti-counterfeit printed matter (1 ′) provided with the printed pattern (6 ′) is formed by forming a printed pattern (6 ′) having a gray color on a white substrate (2 ′). As the base material (2 ′), general white fine paper (manufactured by Shiraoi Nippon Paper Industries) was used.

  As shown in FIG. 5, the printed pattern (6 ′) has a gray first printing area (3 ′) formed of colored penetrating ink and a gray color that is the same color as the first printing area (3 ′). The second print area (7 ') having The first printing area (3 ') is formed with a solid gray color penetrating ink shown in Table 1 with a dot area ratio of 100%, and the second printing area (7') is silver ink ( It was formed with a dot area ratio of 35% using Dainichi Seika Kogyo K.K. Silver ink is an ink composed of an aluminum pigment and having excellent light blocking properties, and an image printed with this ink has low light transmittance. Since the silver ink has a density about three times that of the colored penetrating ink, the two images have the same color by constituting with a dot area ratio of about one third. All were printed by the wet offset printing method. The lightness L * of the first printing area (3 ′) and the second printing area (7 ′) was about 84, and the reflection density of the black component was 0.15, both of which were the same value.

  The effect of the anti-counterfeit printed matter (1 ′) provided with the printed pattern (6 ′) produced in the above configuration will be described below with reference to FIG. In this embodiment, in a general office environment with an illuminance of about 300 lx, where there are two 40 W general fluorescent lamps on the ceiling directly above about 1 m, an anti-counterfeit printed matter is placed on a light table with an illuminance of about 3500 lx on the table top. (1 ') was arranged and observed. As shown in FIG. 6 (a), when the anti-counterfeit printed matter (1 ′) is observed under reflected light, a gray print consisting of a first print region (3 ′) and a second print region (7 ′) A printed pattern (6 ') representing cherry blossom petals was visible. On the other hand, as shown in FIG. 6B, when the anti-counterfeit printed matter (1 ′) is observed under transmitted light, the first printing region (3 ′) of the printed pattern (6 ′) is the base material (2 ') And the color disappeared completely, and only the second print area (7') was visible in a darker gray. As described above, it was confirmed that the anti-counterfeit printed matter (1 ′) of the present invention changes the pattern visually recognized under reflected light and transmitted light.

DESCRIPTION OF SYMBOLS 1, 1 'Anti-counterfeit printed matter 2, 2' Base material 3, 3 'First printing area 4, 4' Light source 5, 5 'Observer's viewpoint 6' Printing pattern 7 'Second printing area 8 Light table

Claims (4)

At least a part of the colored substrate having light transmittance,
A printed pattern formed of a colored penetrating ink containing a coloring material and a penetrating component, and having at least a first printing region having the same hue as the base material and a color having a lightness lower than that of the base material Have
The first print area is visually recognized with different colors due to the difference in brightness with the base material under reflected light, and is visually distinguishable with the base material under transmitted light and cannot be classified. Anti-counterfeit printed matter characterized by. The printed pattern has a second print area that is the same color as the first print area formed with ink that does not include a penetrating component, disposed adjacent to and / or close to the first print area,
The first print area is visually recognized as the same color as the second print area under reflected light, and is visually recognized as the same color as the base material under transmitted light and cannot be separated. 2. The forgery-preventing printed matter according to claim 1, wherein only the region is visually recognized by being divided by the difference between the transmitted light amount and the base material. The forgery-preventing printed matter according to claim 1 or 2, wherein the lightness L * of the first printing region is 60 or more and 95 or less.   The forgery-preventing printed matter according to any one of claims 1 to 3, wherein when the base material is white, the first printing region is achromatic.

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