JP2012223901A - Method for manufacturing forgery-preventing printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing method by which the forgery-preventing printed matter by a special dot composition that uses the pair ink that requires the high degree of printing accuracy can be easily formed by a general printing method and printing machine.SOLUTION: In a method for making a forgery-preventing printed matter in which a pixel group that includes at least a latent image forming pixel comprising a first element and a second element arranged to enclose and adjoin the first element is formed on a base material, one element out of the first element and the second element is formed with the first ink that has a water repellent and/or oil repellent function but has a color different from that of the base material, and the remaining element is printed with the second ink that has no water repellent and/or oil repellent function and is isochromatic in the observation condition under the diffuse reflection light of visible light to cover the contour of the one element, and the first ink and the second ink use the ink observed by a different color in a specific observation condition.

Description

  The present invention relates to a printed matter formed by using a pair of inks and a special halftone dot structure used in the field of security printed matter such as banknotes, passports, securities, identification cards, cards, and passports that require an anti-counterfeit effect. The present invention relates to a printing method that easily realizes high-precision printing.

  Recent advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce sophisticated copies of security prints. For this reason, a so-called forgery prevention technique with excellent authenticity discrimination is required as a technique for discriminating between a duplicate product or a counterfeit product and a genuine product. Examples of anti-counterfeiting technology with excellent authenticity discrimination include, for example, squeezing and holograms attached to banknotes, and such technology cannot be easily counterfeited or copied. By confirming the existence, it can be determined whether the printed matter is a counterfeit or a duplicate.

  One of these anti-counterfeiting technologies is that two observations under the observation conditions under the diffuse reflection of visible light are observed as the same color, but two observations under different observation conditions under the specific observation conditions. There is an anti-counterfeiting technology that uses ink (pair ink) and forms it using a special configuration. These technologies are configured to form a latent image on one of the paired inks and to form an image that camouflages the latent image on the other ink to make the latent image invisible. Under observation conditions, the latent image cannot be observed, but has an effect that the latent image appears when observed under a specific observation condition, and the discriminator visually recognizes the latent image, Authenticity discrimination is performed.

  As these anti-counterfeiting technologies, the present applicant observed, for example, by irradiating light in a specific wavelength range in the visible light region, although it is observed as an equal color under the observation conditions under the diffuse reflection light of visible light. In some cases, it has been filed for a printed matter that can be detected as authenticity by using a metameric pair ink that changes to a different color or in which one of the inks is invisible, and is formed by a dot structure with a special structure (for example, patents) Reference 1 and Patent Document 2). These printed materials have an excellent effect of changing the image that was viewed under the observation conditions under the diffuse reflected light of visible light to a completely different image when observed through a specific filter, and authenticity discrimination However, it is necessary to print two color pair inks with extremely high accuracy when producing them.

  Specifically, as shown in FIG. 1, the printed matter described in Patent Document 1 and Patent Document 2 is a first element formed by using one of the paired inks with extremely small halftone dots, thin lines, and the like. (1) and a latent image image forming pixel (3) formed by printing the second element (2) formed with the other ink without gaps.

  This imprinting is a printing method that requires a high accuracy called “tweeping”, in which the first element (1) and the second element (2) have no slight misalignment. If the first element (1) and the second element (2) are overlapped, the density of the overlapped portion is increased due to the superposition of the ink, and the latent image must be invisible. Must be avoided, the first element (1) and the second element (2) should not overlap. When such a printed matter is produced in large quantities using a printing press, paper expansion and contraction or distortion of the printing plate occurs on the printing press. Realizing printing accuracy by tweezers on the entire surface requires extremely high printing technology, and it is difficult to produce this printed matter unless it is a printer with special equipment and excellent skills.

  As a method for realizing high-precision printing in this way, use a base material with little expansion and contraction during printing, calculate the distortion that occurs on the printing plate during printing, and perform image line design that incorporates distortion in advance. There is a way. However, this method requires high skill and a lot of experience, and is not a method that can be easily realized.

  On the other hand, there is a method that realizes such high-precision printing by utilizing the characteristics of the ink and the characteristics of the printing method. For example, the present applicant uses a combination printing machine of offset printing and intaglio printing, and after offset printing a background pattern consisting of halftone dots or fine lines, immediately before the ink is dried, a new water-based solution such as ethylene glycol ester is used. An application has been filed for a printing method in which a solid or continuous pattern can be printed with an intaglio ink containing a solvent to perform fine pattern printing (see, for example, Patent Document 3).

Japanese Patent No. 4461234 Japanese Patent No. 4444132 Japanese Patent Publication No. 6-41224

  However, when the printing method of Patent Document 3 is used, it is possible to achieve fine printing, but it is necessary to use a very special printing machine capable of combining offset and intaglio printing. It was not a method that could be realized with a printing press. In addition, in this method, the pattern formed by intaglio printing is not a relatively simple image such as a solid or continuous pattern, it is difficult to obtain a stable effect, and there are significant restrictions on the design, The technique is not applicable to a combination of small halftone dots as intended by the present invention. In addition, offset printing and intaglio printing combine printing methods with completely different varnish components and ink film thickness to be used, so the image lines formed by offset printing and the image lines formed by intaglio printing are the same color. It was difficult to finish. From the above, the printing method of Patent Document 3 cannot be applied to produce a printed material in which the latent image is completely hidden using the same color pair ink described in Patent Document 1 and Patent Document 2. It was possible.

  An object of the present invention is to solve the above-described problem for producing an anti-counterfeit printed matter in which the latent image is hidden. Among conventional paired inks, the ink to be preprinted is water-repellent and / or repellent. This is a printing method that adds oil function and utilizes the fact that post-printed ink does not overlap with ink that has been preprinted by this water and / or oil repellent function. The present invention provides a general printing method and a printing method capable of easily forming an anti-counterfeit printed matter with a special halftone dot configuration using a pair ink that requires a high degree of printing accuracy with a general printing method and a printing press. .

  The method for producing an anti-counterfeit printed material according to the present invention has an image forming region in which a pixel group composed of a plurality of fine pixels is formed on at least a part of a base material, and the above-mentioned image forming region is a diffused visible light In the anti-counterfeit printed material having a visible image that can be observed under the observation condition under reflected light and a latent image that can be observed only under a specific observation condition different from the observation condition under the diffuse reflected light of visible light, the pixel group is At least a latent image forming pixel comprising a first element and a second element disposed adjacently surrounding the first element, the first element and the second element being a substrate And at least one ink that is formed of two inks that are observed as equal colors under the observation conditions under the diffuse reflected light of visible light, and that forms the first element and the second element, Different for the other ink under specific viewing conditions The latent image was formed by the first element or the second element formed of ink containing the functional material, and the visible image was formed by a plurality of fine pixels. A method for producing a forgery-preventing printed material, in which one of the first element and the second element is printed with a first ink having a water-repellent and / or oil-repellent function, and the other element is water-repellent. And / or printing with a second ink not having an oil repellency function so as to cover at least the outline of one element.

  In the method for producing a forgery-preventing printed material according to the present invention, the first ink and the second ink for forming the first element and the second element are repelled so that a highly accurate printing is performed as in the past. Even if alignment control is not performed, the same latent image image-forming pixel as that formed easily and accurately by trimming can be obtained simply by maintaining the positional relationship in which the first element is included in the second element. It is formed. Therefore, the forgery prevention printed matter using a pair ink can be produced, without requiring special equipment and a high skill.

The figure which shows the latent image image formation pixel formed by the method of hair removal. The figure which shows the conventional forgery prevention printed matter provided with the latent image image formation pixel. The figure which shows the visible image and latent image which are formed in an image formation area. The figure which shows the structure of a visible image. The figure which shows the structure of a latent image. The figure which shows the structure of a visible image. The figure which shows the structure of a latent image and a camouflage image. The figure which shows the visible image comprised by a latent image image formation pixel. The figure which shows the structure of a latent image. The figure which shows the structure of a visible image. The figure which shows arrangement | positioning of a latent image image formation pixel, a camouflage pixel, and an information pixel. The figure which shows the 1st area | region and 2nd area | region arrange | positioned at an image formation area. The figure which shows the structure of an information image. The figure which shows the structure of a background image. The figure which shows the state which forms a 1st element in the image formation area with the printing method of this invention. The figure which shows the structure of a latent image. The figure which shows the top view and sectional drawing of a 1st element. The figure which shows the top view and sectional drawing of the 2nd ink printed on the 1st element. The figure which shows the state in which 2nd ink is repelled by 1st ink. The figure which shows the latent image image formation pixel formed by the printing method of this invention. The figure which shows the example of the acceptable printing alignment when the printing method of this invention is used. The figure which shows the range of the 2nd ink printed on a 1st element. The figure which shows the top view and sectional drawing of a 2nd element. The figure which shows the top view and sectional drawing of the 2nd ink printed on the 2nd element. The figure which shows the state in which 2nd ink is repelled by 1st ink. The figure which shows arrangement | positioning of the pixel and information pixel which comprise a background image. The figure which shows arrangement | positioning of the pixel and information pixel which comprise a background image. FIG. 3 is a view showing a visible image of a forgery-preventing printed material of Example 1. The figure which shows arrangement | positioning of a latent image image formation pixel, a camouflage pixel, and an information pixel. The figure which shows a state when the forgery prevention printed matter of Example 1 is observed. The figure which shows the state of the position shift of the 1st element produced | generated in the printing process of the forgery prevention printed matter of the comparative example 1 and a 2nd element.

  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.

  A method for producing a forgery-preventing printed material according to the present invention will be described. First, forgery prevention provided with a latent image forming pixel (3) composed of a first element (1) and a second element (2) shown in FIG. After describing the configuration of the printed matter (10), a method for producing the forgery-preventing printed matter (10) of the present invention will be described.

(First example of anti-counterfeit printed matter)
FIG. 2 is a diagram illustrating a first example of a forgery prevention printed matter (10) including a latent image forming pixel (3) including a first element (1) and a second element (2). As shown in FIG. 2, the anti-counterfeit printed matter (10) of the first example includes a plurality of fine pixels (12A) having a color different from that of the substrate (11) on at least a part of the substrate (11). It has an image forming area (13) in which a pixel group (12) is formed, and at least some of the plurality of fine pixels (12A) are composed of latent image forming pixels (3). When the image forming region (13) of the anti-counterfeit printed matter (10) is observed under the observation conditions under the diffuse reflected light of visible light, the visible image (20) having a flat density shown in FIG. Is observed. Further, when observed under specific observation conditions, a flat-density latent image (30) shown in FIG. 3B is visually recognized. The state when observed under specific observation conditions will be described later, and subsequently, the configuration of the visible image (20) and the latent image (30) formed by a plurality of fine pixels (12A). explain.

  FIG. 4A is a diagram showing a visible image (20) formed in the image forming area (13) of the anti-counterfeit printed matter (10) of the first example, and the visible image (20) in the first example. As shown in the enlarged view of FIG. 4A, a plurality of fine pixels (12A) are regularly arranged at a specific pitch (P), and the size of the plurality of fine pixels (12A) is large. All the images are formed in the same size, whereby a flat density image without shading is formed.

  In the present invention, the “pixel” is one halftone dot which is the minimum unit for forming the visible image (20), or a lump of image elements formed by collecting a plurality of halftone dots. For example, a circle, a polygon, or a star may be used, and other special characters or symbols may be included.

  In this specification, “a state in which a plurality of fine pixels (12A) are regularly arranged” means that a plurality of fine pixels (12A) are arranged in a matrix in two different directions at a specific pitch. It is a state. FIG. 2A shows a state in which a plurality of fine pixels (12A) are arranged at specific pitches in two directions, up, down, left, and right, but the two different directions are limited to up, down, left, and right directions. They may not be inclined.

  A printing method for forming a plurality of fine pixels (12A) is not particularly limited, and a printing machine such as offset printing, gravure printing, intaglio printing, flexographic printing, or ink jet printing, electrophotographic printing, or the like is used. A known printing method can be used, such as using a printing apparatus.

  In this description, with respect to the visible image (20) shown in FIG. 4 (a), the pixel size in the left-right direction is “pixel width (R)”, and the pixel size in the vertical direction is It will be described as “pixel height (H)”.

  As described above, the visible image (20) in the anti-counterfeit printed matter (10) of the first example has at least a part of the plurality of fine pixels (12A) formed in the image forming region (13). By being composed of image image forming pixels (3), it is divided into a latent image (30) shown in FIG. 4 (b) and a camouflage image (31) shown in FIG. 4 (c). Next, detailed configurations of the latent image (30) and the camouflage image (31) will be described.

(Latent image)
Among the plurality of fine pixels (12A) formed in the image forming region (13), the plurality of fine pixels (12A) corresponding to the latent image (30) shown in FIG. It is composed of formation pixels (3), thereby forming a letter “B” which is a symbol of the latent image (30). In order to form a latent image (30) having a flat density, as shown in the enlarged view of FIG. 4B, the first element (1) in the latent image forming pixel (3) is All are formed in the same size.

  The pitch (P), the pixel width (R), and the pixel height (H) at which the plurality of fine pixels (12A) are arranged are as described above. In the following description, latent image formation is performed. For the pixel (3), “the pitch (P1) of the latent image forming pixel (3)”, “the width (R1) of the latent image forming pixel (3)” and “the latent image forming pixel (3)”. Height (H1) ".

  In the anti-counterfeit printed matter (10) of the first example, the pattern of the latent image (30) is the letter “B”, but the latent image (30) is composed of other characters, numbers, symbols, figures, marks. Or a pattern may be sufficient.

  As described above, in the latent image forming pixel (3), the first element (1) is formed using one ink of the pair ink, and the second element (2) is formed using the other ink. It is formed. Here, a detailed configuration of the pair ink will be described.

  The two inks configured as pair inks are inks that are observed in the same color under the observation conditions under the diffuse reflection of visible light, and the first element (1) and the second element (2) are the same mesh. It is formed with a point area ratio. The “color matching” in the present invention refers to a range in which the color difference ΔE between two paired inks is less than 6 when printed on the substrate (11) with the same area ratio. In general, when ΔE is about 6, it is observed as a different hue, but the first element (1) and the second element (2) of the present invention are formed by a very small area. If ΔE is less than 6, it can be observed as a uniform color. Thereby, when the anti-counterfeit printed matter (10) is observed under observation conditions under the diffuse reflected light of visible light, the first element (1) and the second element (2) can be observed as the same color. The first element (1) is concealed by the second element (2).

  One of the ink forming the first element (1) and the ink forming the second element (2) is observed in a different color with respect to the other ink under specific observation conditions. Use ink. The “specific observation conditions” in the present specification are observation conditions different from the observation conditions under the diffuse reflection of visible light. Specifically, the observation conditions using an infrared camera, UV lamps, Observation conditions using light outside the visible range, such as observation with irradiation, observation conditions using only light in a specific wavelength band in visible light, and specularly reflected light that strongly reflects light Including conditions. In addition to observation conditions using light, conditions under which the temperature in the environment is changed, conditions under which strong stress is applied, conditions for observation with solid pens, or immersion in water or oil Includes all viewing conditions, such as viewing conditions.

  For example, in the case of using a pair of inks in which one ink strongly absorbs light in the wavelength band of 640 nm or more and the other ink does not absorb light in the wavelength band of 640 nm or more, the specific observation condition is 640 nm. The observation using the above light is performed. As a method that satisfies this observation condition, there is a method of observing using a red sharp cut filter (SC64 manufactured by Fuji Film). In addition, when one of the paired inks uses an ink whose color disappears at a temperature of 30 degrees or higher and the other ink does not change its color even at a temperature of 30 degrees, the specific observation condition is a temperature of 30 degrees or higher. It becomes observation with.

  In order to impart such characteristics, it is necessary to use a functional ink in which a functional material is blended with the ink. Since various functional materials are now on sale, select inks according to their use, such as luminescent ink, infrared absorbing ink, thermochromic ink, and photochromic ink, or mix functional materials in the ink. Just do it.

  By using such a pair ink, when observing the latent image (30) of the anti-counterfeit printed matter (10) under specific observation conditions, the elements formed with the ink not containing the functional material described above are The latent image (30) is visually recognized by elements formed of ink containing a functional material without affecting the visibility of the latent image (30). As described above, in the anti-counterfeit printed matter (10), the plurality of fine pixels (12A) corresponding to the latent image (30) are composed of the latent image forming pixels (3). The latent image (30) is formed by an element made of ink containing a functional material in the latent image forming pixel (3). In addition, the element formed with the ink containing the functional material may be the first element (1) or the second element (2). Moreover, you may form each of 1st element (1) and 2nd element (2) using the ink containing the functional material of a different characteristic. For example, by using a thermochromic ink for one of the paired inks and a photochromic ink for the other, the latent image (30) can be viewed under specific viewing conditions corresponding to each functional material.

(Camouflage image)
The camouflage image (31) is a latent image forming a character “B”, which is a latent image (30), from a plurality of fine pixels (12A) regularly arranged in the image forming area (13). It is formed by a plurality of fine pixels (12A) excluding the formation pixel (3). Hereinafter, the pixel corresponding to the camouflage image (31) will be described as “camouflage pixel (4)”.

  The pitch (P1), the pixel width (R1), and the pixel height (H1) at which the plurality of fine pixels (12A) are arranged are as described above. In the following description, the camouflage pixel (4 ) Are “camouflage pixel pitch (P2)”, “camouflage pixel width (R2)”, and “camouflage pixel height (H2)”.

  The ink for forming the camouflage pixel (4) does not include the above-described functional material, and uses an ink that is observed in the same color as the above-described pair ink under the observation conditions under the diffuse reflection light of visible light. Thereby, the latent image forming pixel (3) and the camouflage pixel (4) are also observed as the same color under the observation condition under the diffuse reflected light of visible light.

  Regarding the shape of the camouflage pixel (4), in addition to the square shown in FIG. 4 (c), it may be a circle, a polygon, a star, or the like, and may include other special characters or symbols. However, in order to form an image having a flat density, the camouflage pixel (4) has the same shape as the latent image forming pixel (3), and is a network of the first element (1) and the second element (2). The dot area ratio is the same as the dot area ratio.

  When such an anti-counterfeit printed matter (10) is observed under observation conditions under diffuse reflection of visible light, a plurality of fine pixels (12A) formed with a pair of inks are observed in the same color. The image image (30) is obscured by the camouflage image (31), and only the visible image (20) is observed. In the visible image (20) observed at this time, a plurality of fine pixels (12A) formed in the image forming area (13) are regularly arranged, and at any position in the image forming area (13). Since the reflectance of the plurality of fine pixels (12A) is the same, the image is observed as a flat density image.

  On the other hand, when observed under specific observation conditions, the portion formed with the ink containing the functional material is observed, and the latent image (30) formed with the element made of the ink containing the functional material is visually recognized. (FIG. 3B). At this time, since the first elements (1) are all formed in the same size, the latent image (30) is visually recognized with a flat density.

  As described above, the forgery-preventing printed matter (10) in which the latent image (30) is applied to the visible image (20) is obtained from the visible image (20) that is observed under the observation condition under the diffuse reflection of visible light. It can be determined that the printed matter is authentic by confirming that it changes to the latent image (30) under specific observation conditions.

  As described above, the anti-counterfeit printed matter (10) produced according to the present invention is an example in which the plurality of first elements (1) are all formed with the same size, but in the enlarged view of FIG. As shown, the size of the first element (1) may be different in the plurality of latent image forming pixels (3). In this case, when observed under specific viewing conditions, a latent image having a plurality of densities is generated due to a difference in the area of the elements made of ink containing the functional material for each latent image forming pixel (3). (30) is visually recognized.

  In the first example of the anti-counterfeit printed matter (10), a visible image (20) is formed by arranging a plurality of fine pixels (12A) at intervals between the plurality of fine pixels (12A). However, as shown in the enlarged view of FIG. 6, a plurality of fine pixels (12A) may be arranged in the image forming region (13) without a gap. In this case, the visible image (20) is observed as a complete solid image. At this time, the latent image forming pixels (3) constituting the latent image (30) are arranged so as to continuously form the latent image (30) of the characters “B” as shown in FIG. Alternatively, the latent image forming pixels (3) may be spaced apart from each other. FIG. 7B shows a configuration of the camouflage image (31) with respect to the latent image (30) of the character “B” formed by continuously arranging the latent image forming pixels (3). As described above, the pixels excluding the latent image forming pixel (3) from the plurality of fine pixels (12A) regularly arranged in the image forming area (13) are pixels constituting the camouflage image (31). Become.

(Second example of anti-counterfeit printed matter)
Next, a second example of the anti-counterfeit printed matter (10) provided with the latent image forming pixels (3) composed of the first element (1) and the second element (2) will be described.

  The anti-counterfeit printed matter (10) of the second example is an example in which the visible image (20) is formed by only the latent image forming pixels (3) as compared to the first example. A visible image (20) formed in the image forming area (13) of the anti-counterfeit printed matter (10) of the second example is shown in FIG.

(Visible image)
FIG. 8 is a view showing the visible image (20) formed in the image forming area (13). The visible image (20) in the second example is a latent image as shown in the enlarged view of FIG. The formation pixels (3) are regularly arranged at a specific pitch (P1), and the plurality of latent image image formation pixels (3) are all formed in the same size. As a result, a flat density image without shading is formed.

(Latent image)
The latent image (30) of the second example will be described using an example in which the character “B” is visually recognized, as in the first example. The ink that forms the first element (1) and the second element (2) constituting the latent image forming pixel (3) is the same as that in the first example, and thus description thereof is omitted.

  FIG. 9A shows a latent image (30) of the second example. FIG. 9B is an enlarged view of the latent image forming pixel (3) corresponding to the character “B” of the latent image (30). FIG. 9C is an enlarged view of the latent image forming pixel (3) corresponding to the background of the character “B” of the latent image (30). As described above, the plurality of fine pixels (12A) formed in the image forming area (13) are all configured by the latent image forming pixels (3), and the first image forming the latent image forming pixels (3). The first element (1) and the second element (2) are formed with the same dot area ratio.

  As shown in FIGS. 9B and 9C, the anti-counterfeit printed material (10) of the second example is a latent image image forming pixel (10) corresponding to the character “B” of the latent image (30). The size of the first element (1) in 3) is different from that of the first element (1) in the latent image forming pixel (3) corresponding to the background of the character “B”. 9B and 9C, the first element (1) in the latent image forming pixel (3) corresponding to the character “B” is the background of the character “B”. Is formed larger than the first element (1) in the latent image forming pixel (3) corresponding to.

  In the configuration of the forgery-preventing printed matter (10) shown in FIG. 9, if the first element (1) is formed of ink containing a functional material, the character portion “B” and the character portion “B” In the background, there is a difference in shade due to the area of the first element (1) constituting each, and as shown in FIG. 9A, the letter “B” formed by the large first element (1) It is possible to observe the latent image (30) that is darkly visible against the background of the letter “B”.

  In the second example, the reason why the size of the first element (1) in the latent image forming pixel (3) is made different is that a plurality of fine elements corresponding to the latent image (30) of the first example are used. The pixel (12A) is composed of the latent image forming pixel (3), and the latent image (30) is formed by the presence or absence of an element made of ink containing a functional material. This is because the latent image (30) is formed by the difference in density when observed under specific viewing conditions by varying the size of the element made of ink containing the functional material. In the configuration of the anti-counterfeit printed matter (10) shown in FIG. 9, if the second element (2) is formed of ink containing a functional material, the background of the letter “B” is “B”. A latent image (30) that is viewed darkly with respect to the character is observed.

(Third example of anti-counterfeit printed matter)
Subsequently, a third example of the anti-counterfeit printed matter (10) including the latent image forming pixels (3) including the first element (1) and the second element (2) will be described.

  The anti-counterfeit printed matter (10) of the third example includes an image formed by the plurality of fine pixels (12A) with the flat density described in the first example or the second example, and meaningful information. It is an example in which a visible image (20) is formed by the provided image. In the present description, “significant information” refers to information such as letters, numbers, symbols, figures, marks, and patterns.

  The visible image (20) formed in the image formation area (13) of the anti-counterfeit printed matter (10) of the third example is shown in FIG.

  In the third example, the visible image (20) is composed of an image formed with a flat density as shown in FIG. 10B and an image with meaningful information as shown in FIG. 10C. In the following description, an image having a flat density shown in FIG. 10B is referred to as a “background image (21)”, and an image having meaningful information shown in FIG. ) ”. The plurality of fine pixels (12A) constituting the background image (21) and the plurality of fine pixels (12A) constituting the information image (22) will be described later, but the background image (21) and the information image (22) are described later. The pixels constituting the pixel are different from each other.

  First, for the anti-counterfeit printed matter (10) of the third example, the background image (21) constituting the visible image (20) is the latent image forming pixel (3) and the camouflage pixel (4) described in the first example. ) Are arranged at regular intervals, and the information image (22) constituting the visible image (20) will be described as an example composed of the letter “A”.

(background image)
The background image (21) in the anti-counterfeit printed matter (10) of the third example is the same as the configuration of the image observed at the flat density described in the anti-counterfeit printed matter (10) of the first example shown in FIG. For this reason, the background image (21) is composed of a latent image (30) and a camouflage image (31).

  As shown in the enlarged view of FIG. 10B, also in the third example, the plurality of fine pixels (12A) corresponding to the latent image (30) are composed of the latent image forming pixels (3). Of the first element (1) and the second element (2) constituting the latent image forming pixel (3), the latent image of the character “B” is formed by an element made of ink containing a functional material ( 30) is formed. Also in the third example, a plurality of fine pixels (12A) corresponding to the camouflage image (31) will be described as “camouflage pixels (4)”, and the camouflage pixels (4) are shown in FIG. As shown in the enlarged view of (b), it is arranged at a position corresponding to the background of the letter “B”.

(Information image)
In the information image (22), as shown in the enlarged view of FIG. 10 (c), a plurality of fine pixels (12A) made of ink of a different color from the base material (11) are regularly arranged at a specific pitch. Thus, an information image (22) of the character “A” is formed. Hereinafter, a plurality of fine pixels (12A) corresponding to the information image (22) is referred to as “information pixel (5)”, and a specific pitch at which the information pixels (5) are regularly arranged is referred to as “information pixel (5)”. This will be described as “pixel pitch (P3)”.

  The direction in which the information element (5) is arranged is the same as the direction in which the plurality of fine pixels (12A) constituting the background image (21) are arranged in a matrix. FIG. 10 shows a state in which a plurality of fine pixels (12A) and information pixels (5) constituting the background image (21) are regularly arranged in the vertical and horizontal directions, but the information pixel (5) As long as the direction is the same as the direction in which the plurality of fine pixels (12A) constituting the background image (21) are arranged, they may be arranged in an oblique direction.

  The information pixel (5) does not include the above-described functional material, and may be formed of ink that is observed in the same color as the above-described pair ink under observation conditions under the diffuse reflection of visible light. 11) and an ink of a color different from that of the pair ink (not including a functional material). However, the ink used for the information pixel (5) needs to have an optical characteristic that becomes invisible under a specific observation condition or has a visibility that is difficult to observe.

  Regarding the shape of the information pixel (5), in addition to the square shown in FIG. 10 (c), it may be a circle, a polygon, a star, or the like, and may include other special characters or symbols. The shape of the information pixel (5) may be different from that of the latent image forming pixel (3) and the camouflage pixel (4).

  In this description, with respect to the information pixel (5) shown in FIG. 10C, the pixel size in the horizontal direction is “pixel width (R3)”, and the pixel size in the vertical direction is “pixel”. Is described as “height (H3)”.

  The pattern of the information image (22) in the anti-counterfeit printed matter (10) of the third example is an example formed by the letter “A”, but the information image (22) is composed of other characters, numbers, symbols, A figure, a mark, a pattern, etc. may be sufficient.

  The size of each information pixel (5) constituting the information image (22) may be the same size or different sizes. The plurality of information pixels (5) shown in FIG. 10C are all formed with the same size, and in this case, an information image (22) having a flat density without shading is formed. On the other hand, when a part of the plurality of information pixels (5) is changed, a density difference is generated depending on the size of the information pixel (5), and an information image (22) having a plurality of densities is formed. Here, an example in which information pixels (5) having the same size are regularly arranged at a specific pitch (P3) will be described.

  Next, the arrangement relationship between the background image (21) and the information image (22) will be described.

  The pixels constituting the background image (21) and the information pixels (5) constituting the information image (22) are arranged as shown in FIG. 11 (a) or FIG. 11 (b).

  FIG. 11A shows a latent image forming pixel (3) and a camouflage pixel (4) constituting the background image (21) shown in FIG. 10B, and an information pixel (5) shown in FIG. It shows a state where they are arranged so as not to overlap. In this way, when the information pixel (5) is formed of ink of the same color as the pair ink by arranging, the pixel of the portion (inside the broken line in FIG. 11A) where the information image (22) is formed is formed. Since the area ratio is higher than the area ratio of the portion formed only by the pixels constituting the background image (21), a difference in reflected light occurs when observed under diffuse reflected light of visible light, and the information image ( 22) is visually recognized. In addition, when the information pixel (5) is formed of ink of a color different from the base material (11) and the pair ink (not including a functional material), a portion where the information image (22) is formed (FIG. 11A) In the portion formed by only the pixels constituting the background image (21) and the background image (21), a difference in color of the reflected light occurs, and the character “A” as the information image (22) is visually recognized.

  On the other hand, FIG. 11B shows a state in which a part of the information pixel (5) overlaps a part of the latent image forming pixel (3) and a part of the camouflage pixel (4). FIG. 11B shows an arrangement in which the information pixel (5) overlaps the latent image forming pixel (3) and the camouflage pixel (4). The anti-counterfeit printed matter (10) of the third example is shown in FIG. As shown in FIG. 11C, the latent image forming pixel (3) and the camouflage pixel (4) may overlap with the information pixel (5). Even in this arrangement, the portion where the information pixel (5) is formed (within the broken line in FIG. 11 (b) and FIG. 11 (c)) and the portion formed only by the pixels constituting the background image (21). As a result, a difference in reflected light occurs, and the character “A” that is the information image (22) is visually recognized.

  The above description is a case where the latent image forming pixels (3) and the camouflage pixels (4) constituting the background image (21) are arranged with a certain interval, but the background image (21) Even in the case of the solid image configuration shown in FIG. 6, the information pixel (5) may be formed on the pixels constituting the background image (21), or the background image (21 ) May be formed. In any case, in the portion where the pixel constituting the background image (21) and the information pixel (5) overlap, the color of the two pixels becomes a mixed color, and only the pixels constituting the background image (21) are formed. The difference in the color of the reflected light occurs with respect to the portion to be recognized, and the character “A” as the information image (22) is visually recognized.

  When the anti-counterfeit printed material (10) of the third example configured as described above is observed under the observation conditions under the diffuse reflection light of visible light, the background image (21) formed with a flat density image is included in the background image (21). The density of the portion where the information pixel (5) constituting the information image (22) is formed is high (when the color of the pixel constituting the information image is the same as the color of the pixel constituting the background image) or the color is Differently (when the color of the pixel constituting the information image is different from the color of the pixel constituting the background image), the visible image (20) with the letter “A” can be observed (FIG. 10A). Note that the observation under specific observation conditions is the same as in the first example, and the latent image (30) of the character “B” is visually recognized (FIG. 3B).

  In the third example of the anti-counterfeit printed matter (10), the information pixel (5) and the background image (21) are described so that the pixels constituting the information pixel (5) and the background image (21) do not overlap. The anti-counterfeit printed matter (10) may be produced by arranging the pixels constituting the pixel as described in Japanese Patent No. 4461234.

  In this case, as shown in the enlarged view of FIG. 12, the image forming area (13) includes a first area (14) and a smaller area than the first area (14), and the periphery is defined by the first area (14). A plurality of second regions (15) to be surrounded are arranged. Of the plurality of first regions (14), the first region (14) and the second region (15) adjacent to each other in the vertical and horizontal directions with respect to one first region (14). The arrangement relationship is constant within the image forming area (13). Of the plurality of second regions (15), the first region (14) and the second region (15) adjacent to one second region (15) in the vertical and horizontal directions. The arrangement relationship is constant within the image forming area (13).

  Then, a plurality of fine pixels (12A) are formed in the first region (14) and the second region (15), and the image forming region (13) is observed under observation conditions under the diffuse reflected light of visible light. A possible visible image (20) and a latent image (30) observable under specific viewing conditions are formed.

  Specifically, as shown in the enlarged view of FIG. 13, the information pixel (5) is arranged in the first region (14) to form the information image (22) of the character “A”. Note that the information pixel (5) is not arranged in the first region (14) not corresponding to the information image (22).

  Further, as shown in the enlarged view of FIG. 14A, the background image (21) includes a plurality of fine pixels made of ink of a color different from that of the base material (11) in all the second regions (15). (12A) are all arranged in the same size, and the second area (15) corresponding to the latent image (30) among the pixels arranged in the second area (15) is shown in FIG. ), The second region (15) formed by the latent image forming pixel (3) and corresponding to the camouflage image (31) has a camouflage pixel (4) as shown in FIG. 14 (c). Form with.

  The example of the configuration of the forgery prevention printed matter (10) including the latent image forming pixels (3) including the first element (1) and the second element (2) has been described above. The production method of the printed material is not limited to these configurations, and any technique of the present invention can be used as long as it includes a latent image forming pixel (3) formed by tweezers using two pair inks. Range. Further, in the conventional production methods described so far, the printed matter having the latent image forming pixels (3) is produced by printing the first element (1) and the second element (2) together by tweezers. However, a method for producing an anti-counterfeit printed material having latent image forming pixels (3) according to the present invention, which is not printed by tweezers, will be described.

  The configuration of the image forming region (13) in which a plurality of fine pixels (12A) are formed in the method for producing a forgery-preventing printed matter of the present invention will be described. The first example, the second example, and the third example described above The description will be made using the words and symbols described in the example of the anti-counterfeit printed matter. In addition, the patterns of the visible image (20) and the latent image (30) formed by the method for producing an anti-counterfeit printed matter of the present invention are the anti-counterfeit described in the first example, the second example, and the third example. This will be described with an example in which the same design as the printed material (10) is used.

  As shown in FIG. 15, the production method of the present invention first uses the first element (1) or the second element using one of the above-described paired inks, which has one water-repellent and / or oil-repellent function. A plurality of elements (2) are formed. Here, an example in which the first element (1) is formed will be described. As a result, as shown in the enlarged view of FIG. 16, the first element (1) in the plurality of latent image forming pixels (3) corresponding to the latent image (30) is formed. In the following description, an ink having a water-repellent and / or oil-repellent function to be preprinted will be described as a “first ink”.

  The water repellency and / or oil repellency of the first ink, which is essential in the production method of the present invention, includes adding a silicone-based additive or a fluorine-based additive to the ink, or a resin having a siloxane or a fluoro group. By using it as a varnish, it can be easily applied to ink of any hue. In addition, the compounding ratio in the ink of the resin which has a silicone type additive or a fluorine type additive or a siloxane or a fluoro group is in the range of 1 to 15%. What is necessary is just to adjust suitably according to the repelling condition.

  FIG. 17 (a) is an enlarged plan view showing one first element (1) among the plurality of first elements (1) formed, and FIG. 17 (b) is a sectional view. Show. The manufacturing method described below is performed for all the first elements (1). However, in this description, for the sake of convenience, description will be made using one first element (1) shown in FIG.

  Next, as shown in FIG. 18, the first element (1) is covered with the same size as the latent image forming pixel (3) on the first element (1) formed with the first ink. As described above (in the range shown by oblique lines), printing is performed using the other ink of the above-described pair inks that does not have the water- and / or oil-repellent functions. In the following description, the ink that does not have the water-repellent and / or oil-repellent function to be post-printed is referred to as “second ink” with respect to the first ink that has the water-repellent and / or oil-repellent function to be pre-printed. ".

  The functional material described above in the present invention is included in one or both of the first ink and the second ink. However, when both the first ink and the second ink contain a functional material, it is necessary to use an ink containing different functional materials. If a functional material is included in one of the first ink and the second ink, the element formed by the ink containing the functional material may be the first element (1) or the second element ( 2).

  FIG. 18A shows a region where the latent image image forming pixel (3) and the first element (1) overlap with each other with a dotted line, and shows a range of the latent image image forming pixel (3) with a broken line. .

  In the production method of the present invention, when the second ink is overlaid and printed on the first element (1) made of the first ink, the water repellency and / or oil repellency function of the first ink causes a change in FIG. As shown, the second ink printed on top of the first ink is repelled and the second ink is not overlaid on the first element (1). As a result, as shown in FIG. 20, the second element (2) is arranged adjacent to the first element (1) without a gap, and has the same configuration as that formed by so-called tweezing. A latent image forming pixel (3) can be formed.

  As described above, when the production method of the present invention is used, it is necessary to adjust the printing by using the first element (1) and the second element (2) as the arrangement of the tweezers as in the conventional technique. The second element (1) that is adjacent to the first element (1) without a gap can be obtained simply by printing the second ink so as to cover the first element (1) formed with the first ink. 2) can be easily formed.

  As shown in FIG. 21A to FIG. 21D, it is assumed that the range formed using the second ink having the same size as the latent image forming pixel (3) is deviated from the designed position. However, if the second ink is printed so as to cover the first element (1), the latent image forming pixel (3) can be formed. As described above, it is possible to ensure a certain degree of redundancy in printing when a printed material that is strictly required to be printed is produced.

  In the production method of the present invention described above, as a result, the second ink printed on the first element (1) is changed by the first ink constituting the first element (1). Because it is repelled, it is not necessary to print the second ink entirely on the first element (1). For example, as shown in FIG. 22, the second ink may be printed in a range that overlaps at least the outline of the first element (1). In this case, since it is not necessary to print the second ink on the entire first element (1), the amount of ink used can be reduced, which is efficient.

  Next, an example in which the second element (2) is preprinted using the first ink will be described.

  FIG. 23A is an enlarged plan view showing one second element (2) among a plurality of second elements (2) formed by using the first ink, and FIG. b) shows a cross-sectional view. Hereinafter, the manufacturing method to be described is performed for all the second elements (2). However, in this description, for the sake of convenience, description will be made using one second element (2) shown in FIG.

  Next, as shown in FIG. 24, the second ink is used on the second element (2) formed of the first ink so as to cover at least the outline of the second element (2). Print. In FIG. 24A, the area printed with the second ink is indicated by hatching, and the portion outside the dotted line within the hatching is a portion that overlaps the outline of the second element (2). . In FIG. 24A, the range of the latent image forming pixel (3) is indicated by a broken line.

  Even when printed in this way, the second ink formed on the first ink is repelled by the water and / or oil repellent function of the first ink, as shown in FIG. The second ink is not overcoated on the second element (2). As a result, the second element (2) is arranged adjacent to the first element (1) without a gap, and the latent image forming pixel (3) having the same configuration as that formed by so-called tweezing is used. ) Can be formed.

  The essence of the production method of the present invention is to provide a water-repellent and / or oil-repellent function to the ink to be printed first among the paired inks of the same color, and to make the post-printing ink repelled so that there is no error and the hair removal Is easily formed. Printing an ink having a water-repellent and / or oil-repellent function has been conventionally performed as a method for improving the durability of a printed material, and is not unusual at all.

  As a unique printing method using a water and / or oil repellent function, there is a printing method for forming a three-dimensional structure as described in Japanese Patent Application Laid-Open No. 2007-229967 and Japanese Patent Application Laid-Open No. 2006-168032. is doing. However, any of the techniques using the water repellency and / or oil repellency functions of the inks proposed in the past, as in the present invention, can be used as a means for ensuring the redundancy of printing. The oil repellent function was not used. By using the production method of the present invention, a combination of a printing plate surface made by the latest plate making equipment represented by CTP, a sheet-fed printing press capable of high-precision printing, and a skilled operator Prints that cannot be formed and require tweezers in a large size, a general printing plate surface produced by film making, a general offset printing machine including a web system, and an average skill It is possible to easily form even an operator.

  The method for forming the latent image forming pixel (3) by the manufacturing method of the present invention has been described above, but only the latent image forming pixel (3) is formed in the image forming region (13) by this method. The anti-counterfeit printed matter (10) of the example can be produced.

  When producing the anti-counterfeit printed matter (10) of the first example, the order in which the latent image image forming pixel (3) and the camouflage pixel (4) are formed is not particularly limited, but first, the latent image image forming pixel (3 ) Forming one of the first element (1) and the second element (2) comprising the first ink, followed by the remaining ink and camouflage using the second ink. The pixel (4) may be formed at the same time. In the case of using the above-described printing press, once the area of the remaining element formed using the second ink and the area for forming the camouflage pixel (4) are prepared in advance as a printing plate surface, Can be printed.

  In the anti-counterfeit printed matter (10) of the third example, when the latent image forming pixels (3) and the camouflage pixels (4) constituting the background image (21) are arranged at a certain interval, FIG. As shown to a), it arrange | positions so that the pixel which comprises a background image (21), and an information pixel (5) may not overlap, or as shown to FIG.11 (b), a part of information pixel (5) May be arranged so as to overlap a part of the latent image forming pixel (3) and a part of the camouflage pixel (4).

  At this time, the order of forming the latent image forming pixel (3), the camouflage pixel (4), and the information pixel (5) is not particularly limited, and the information pixel (5) has a color different from that of the substrate (11). It is formed using ink.

  In FIG. 26, the information pixel (5) is first printed on the substrate (11), and the latent image forming pixel (3) and the camouflage pixel (4) are formed so as to overlap a part of the information pixel (5). It shows the state that was done. The method for forming the latent image forming pixel (3) is as described above, and one of the first element (1) and the second element (2) has a water repellency and / or oil repellency function. Preprint with the first ink provided and postprint the remaining elements with the second ink. The camouflage pixel (4) is printed with the second ink.

  By printing in this way, a part of the information pixel (5) is covered with the latent image forming pixel (3) and the camouflage pixel (4), but the pixel of the portion where the information image (22) is formed is covered. Since the area ratio is larger than the area ratio of the portion formed only by the pixels constituting the background image (21), a difference in reflected light occurs when observed under diffuse reflected light of visible light, and the information image ( 22) is visually recognized.

  In FIG. 27A, first, the latent image forming pixel (3) and the camouflage pixel (4) are printed on the substrate (11), and a part of the latent image forming pixel (3) and the camouflaging pixel (4) are printed. The information pixel (5) is formed so that a part of each overlaps. At this time, when the ink for forming the information pixel (5) is printed on the first element (1) formed of the first ink, the ink for forming the information pixel (5) is repelled. The information pixel (5) is formed in the state shown in the enlarged view of FIG. As a result, the information pixel (5) overlapping the latent image forming pixel (3) is formed in a shape different from the information pixel (5) overlapping the camouflage pixel (4) shown in FIG.

  As a result, even if the shape of the information pixel (5) overlapping the latent image forming pixel (3) and the information pixel (5) overlapping the camouflage pixel (4) are different, each information pixel (5) is very small. Therefore, the influence on the visibility of the information image (22) is small, and the information image (22) can be visually recognized. However, the information pixel (5) is formed on the pixel formed of the first ink. When printing ink, it is necessary to appropriately adjust the printing position according to the visibility of the information image (5). The same applies when the second element (2) is formed of the first ink.

  Next, a case where the background image (21) is formed as a solid image shown in FIG. 6 in the anti-counterfeit printed matter (10) of the third example will be described. In this case, first, the pixels constituting the background image (21) may be formed, and the information pixel (5) may be formed thereon, or after the information pixel (5) is formed, the information image (5) The pixels constituting the background image (21) may be formed on the top. However, when the information pixel (5) is formed on the background image (21), the information pixel (5) is formed on the first element (1) or the second element (2) formed by the first ink. ) Is printed, the ink for forming the information pixels (5) is repelled, so that the printing position needs to be adjusted as appropriate according to the visibility of the information image (5). In addition, in the case of using, for example, black or indigo color having a remarkably high coloring power to form the background image (21), if the information pixel (5) is formed first, the information image (22) is formed. In such a case, it is desirable to first form the background image (21) and print the information pixel (5) thereon.

  Hereinafter, although the Example of the printed matter produced concretely according to the form for implementing the above-mentioned invention is demonstrated in detail, this invention is not limited to this Example.

  Example 1 has the configuration described in the third example, and the visible image (20 ′) includes significant information of the letter “A” of the alphabet, and the alphabet “ This is a method for producing an anti-counterfeit printed matter (10 ′) in which the latent image (30 ′) of the letter “B” is concealed. As the base material (11 ′), white coated paper (manufactured by Nippon Paper Industries Co., Ltd.) was used. The paired ink used in Example 1 has a feature that the first ink looks dark and the second ink disappears when observed with an infrared camera. A first embodiment of the present invention will be described with reference to FIGS.

  28A is a diagram showing a visible image (20 ′), FIG. 28B is a diagram showing a background image (21 ′), and FIG. 28C is an information image (22 ′). ).

  Table 1 shows the composition of the first ink.

  The first ink in Table 1 has infrared absorbing ability, and further has a silicone additive added. Therefore, the first ink has water repellency and oil repellency functions, and has a characteristic of repelling the second ink.

  Table 2 shows the composition of the second ink.

  The second ink in Table 2 is a so-called general flexographic ink that does not have infrared absorbing ability and does not contain a silicone-based additive. The first ink and the second ink are observed in red under the observation conditions under the diffuse reflection of visible light, and are in a color-matching relationship with each other.

  First, using the first ink having the composition shown in Table 1, the first element (1 ′) constituting the latent image (30 ′) is printed by the UV drying flexographic printing method and irradiated with UV light. Then, the first ink was completely cured. The first element (1 ′) is a circular pixel having a diameter of 0.1 mm, regularly arranged at a pitch of 0.4 mm, and the letter “B” of the alphabet as the latent image (30 ′). Formed.

  Next, the second ink is printed on the first element (1 ′) so as to cover the first element (1 ′) with the same size as the latent image forming pixel (3 ′), and at the same time, the camouflage is printed. Pixel (4 ′) and information pixel (5 ′) were printed using the second ink. The range covering the first element (1 ′) with the second ink and the size and shape of the camouflage pixel (4 ′) are squares with a side of 0.2 mm, and the size and shape of the information pixel (5 ′) are: A circular pixel having a diameter of 0.1 mm was used. At this time, as shown in the enlarged view of FIG. 29, the pitch (P3) of the information pixel (5 ′) is set to 0.4 mm, and the center position of the first element (1 ′) and the camouflage pixel (4 ′) is set. Thus, they are formed so as to be shifted by a half pitch (0.2 mm) in the vertical and horizontal directions.

  The second ink printed on the first element (1 ′) is repelled by the first ink and placed adjacent to the periphery of the first element (1 ′) without gaps, and the tweezers As a result, a latent image forming pixel (3 ′) having the same structure as that formed by the above method was formed.

  FIG. 30 shows the effect of the anti-counterfeit printed matter (10 ′) produced in Example 1. When the anti-counterfeit printed matter (10 ′) produced in Example 1 is observed under the observation conditions under the diffuse reflection light of visible light, the significant information included in the visible image (20 ′) as shown in FIG. The letter “A” of a certain alphabet was visually recognized, and the letter “B” of the alphabet as the latent image (30 ′) could not be visually recognized.

  On the other hand, when observed using an infrared camera, the letter “A” of the alphabet, which is significant information included in the visible image (20 ′), cannot be visually recognized as shown in FIG. Only the letter “B” was visible. As described above, an anti-counterfeiting effect was obtained in which an image observed under observation conditions under diffuse reflection light of visible light and an image observed through an infrared camera can be viewed as completely different images.

  Further, as an additional effect of the forgery-preventing printed material produced in Example 1, when the printed material is painted using a felt pen, a brush pen, a spray, or the like, the water repellent and / or oil repellent function of the first ink causes Only the portion where the 1 element (1 ′) was formed repels ink and paint, and the visible image (20 ′) disappeared completely, and only the latent image (30 ′) appeared. In the case of a printed matter suspected of being counterfeited, it is possible to make a true / false discrimination by filling the printed matter and checking whether or not the letter “B” appears.

(Comparative Example 1)
As a comparative example, for the visible image (20 ′) formed on the anti-counterfeit printed matter (10 ′) produced in Example 1, a pair ink having the same element configuration and not having water repellency and / or oil repellency functions is used. The latent image forming pixel (3 ″) is formed by using the tweezers, and the camouflage element (4 ″) and the information pixel (5 ″) are formed in the same manner as in Example 1. An anti-counterfeit printed matter (10 ″) was produced with an offset printing machine.

  Immediately after the start of printing, the positions of the first element (1 ″) and the second element (2 ″) are not aligned, and the latent image forming pixel (3 ″) that must originally be in the arrangement of tweezers In FIG. 31, a blank area (6 ″) shown in FIG. 31 was generated, and when a visible image was observed, a latent image with a white and blurred feeling was confirmed.

1, 1 ′, 1 ″ first element 2, 2 ′, 2 ″ second element 3, 3 ′, 3 ″ latent image image forming pixel 4, 4 ′, 4 ″ camouflage pixel 5, 5 ′, 5 ″ information pixel 6 ″ blank area 10, 10 ′ anti-counterfeit printed matter 11 base material 12 pixel group 12A pixel 13 image forming area 14 first area 15 second area 20, 20 ′ visible image 21, 21 ′ Background image 22, 22 ′ Information image 30, 30 ′ Latent image 31 Camouflage image

Claims (1)

At least a part of the base material has an image forming region in which a pixel group composed of a plurality of fine pixels is formed, and the image forming region is a visible image that can be observed under observation conditions under diffuse reflected light of visible light And a forgery-proof printed matter provided with a latent image that can be observed only under specific observation conditions different from the observation conditions under diffuse reflection light of visible light,
The pixel group includes at least a latent image forming pixel including a first element and a second element disposed adjacently so as to surround the first element;
The first element and the second element are different colors from the base material, are formed of two inks that are observed as equal colors under the observation conditions under the diffuse reflection light of the visible light, and At least one of the inks forming the first element and the second element includes a functional material that is observed in a different color with respect to the other ink under the specific observation condition,
The latent image is formed by the first element or the second element formed of ink containing the functional material,
A method for producing the anti-counterfeit printed matter in which the visible image is formed by the plurality of fine pixels,
One of the first element and the second element is printed with a first ink having water and / or oil repellency, and the other element has water and / or oil repellency. A method for producing a forgery-preventing printed matter, characterized in that printing is performed so as to cover at least the outline of the one element with a second ink that does not.

Images