JP4660775B2 - Latent image printed matter - Google Patents

Description

  The present invention relates to a latent image printed material that can clearly switch a plurality of latent images in accordance with a change in incident angle of light and that has a rich color change.

  For printed matter that requires security such as banknotes, securities, and postal tickets, it is indispensable to add authenticity determination elements as a means for distinguishing genuine products from counterfeit products in order to eliminate counterfeit products. In addition, in order to prevent the use of counterfeit goods in personal sales, it is desirable that this authenticity determination element is an element that can be determined by anyone using natural light without requiring a special tool.

  As an example of the authenticity determination element capable of determining authenticity with natural light, there are pearl printing, show-through, and latent image printing. These are the ones in which an image (latent image) that could not be observed until then appears only under specific conditions such as translucency, and the color assigned to the image according to the observation angle as in pearl printing. There are various types, such as those that change.

  These authenticity determination elements are desirably excellent in the difficulty of counterfeiting, so-called counterfeit resistance, as a matter of course, in addition to ensuring authentication.

  By special pigments and various functional materials, special light reflective powders such as pearl pigments, scale-like colored metal pigments, and other optically variable flakes are blended in inks and paints, depending on the observation angle. An ink excellent in color flip-flop property that causes a change in hue can be produced. Using these inks with excellent color flip-flop properties, even if they are simply solid-printed, they have a certain counterfeit resistance due to the difficulty of reproducing their color changes compared to printing with ordinary inks. (For example, refer to Patent Document 1).

  In addition, instead of constructing a simple design with paint and ink having excellent color flip-flop properties as in Patent Document 1, there is also a true / false discrimination element that makes it more difficult to forge by combining with a special latent image technology. Has appeared. For example, it has become possible to form a printed matter in which a latent image excellent in color flip-flop properties appears while reversing light and shade using a special iris pearl pigment (see, for example, Patent Document 2).

  The inks with rich color change described in Patent Document 1 and Patent Document 2 described above and printed materials using the ink are difficult to counterfeit, and not only function as authenticity determination elements but also vivid images and latent images. It is possible to decorate the display, expand the degree of freedom of design and expression, and allow the user to enjoy the color change.

  By the way, although these examples are true / false discriminating elements specialized in color change of an image, there are also true / false discriminating elements specialized in a plurality of image switches. Among these, there is a technology that switches and changes three or more latent images, and the number of images that are collated and confirmed for authenticity determination increases, compared to a technology that can express only one latent image. In addition to being superior in authenticity discrimination and counterfeit resistance, by switching multiple latent images at a narrow angle, it is possible to express movement and give a stereoscopic effect to the latent image. It is possible to entertain the visual effect (see, for example, Patent Document 3).

JP 7-292294 A Japanese Patent No. 3718712 JP 2007-106116 A

  At present, most of the printed matter having color flip-flop properties that we can see, except for holograms, are formed using pearl pigments. Originally, the iris pearl pigment itself is a pigment having excellent color flip-flop properties in which an interference color corresponding to the film thickness of the metal oxide is generated in the regular reflection light region, and the color including the hue changes greatly. However, the effect is proportional to the particle size, and when the printable particle size is reached, the effect drops at a stretch.Therefore, when forming as a printed matter, if the pigment content in the ink is not increased, a sufficient interference effect is visually observed. It is difficult to pull out.

  In addition, even if the interference effect of the pearl can be sufficiently brought out, when the substrate is white like paper, colors other than the interference color of the pearl that has passed through the pearl pigment are reflected on the paper surface. In most cases, the interference color of the color does not stand out. Therefore, a special pearl pigment that has a particularly excellent effect is used, or a dark color close to black is once printed on the base, and then printed with ink containing the pearl pigment on the base to enhance the interference color. In this case, the manufacturing process is complicated. As described above, there is a problem that it is not easy to form a printed matter that makes the observer feel a sufficient color flip-flop by using the pearl pigment alone.

  The technique described in Patent Document 2 is a printed material in which a swelled line image is formed mainly by ink containing an iris color pearl pigment, and message images partially having different wiring angles are formed, and the printed material is inclined. Thus, the message image is observed with continuous color change, but the number of messages that can be applied, so-called latent image, is limited to one.

  Further, since the color change in the printed matter is caused only by the interference effect of the pearl pigment, there is a problem that a sufficient color change cannot be caused unless a particularly excellent special pearl pigment is used.

  The technique described in Patent Document 3 is a convex structure image (hereinafter referred to as “high gloss”) in which an image is formed by continuously arranging convex structure pixels and convex structure pixels having high gloss and swell with the same width and the same pitch. “A convex structure image” in which an image is formed by continuously arranging raised convex structure lines and convex structure pixels at the same width and pitch is referred to as a “convex structure image”) from a certain direction. This is a technology that provides multiple latent images by providing areas with different light reflectivities with respect to light, and has excellent latent image switchability, but the principle of visualizing each latent image is basically convex. Because the so-called light / dark flip-flop is used to change the lightness when the structural image is specularly reflected, the latent image is expressed only by the contrast of light and dark when the convex structure image shines brightly and when it does not shine. The color change was poor. When a convex structure image is formed with an ink containing an iris color pearl pigment, a hue change caused by the pearl interference effect can be obtained in addition to the lightness change in the latent image. In this case, the hue change is an interference of the pearl pigment. Relying only on the effect, it was impossible to express more complex colors.

  In addition, in the technique described in Patent Document 3, when a special glossy material such as a pearl pigment, gold, or silver ink is used for a high-gloss convex structure image, many of these glittering materials are generally transparent. Unlike Grosnis, it does not reflect light suddenly only in the specular reflection area, but slowly begins to reflect light from a relatively wide angle area near the specular reflection area, creating a perfect reflection curve while drawing a relaxed reflection curve. It is often a comparatively gentle characteristic that reaches the highest point at the reflection angle. When three or more latent images are switched using such a glittering material, there is a tendency that the latent image images are mixed and appear depending on the observation environment.

  In addition to the above techniques, a hologram is known as a representative example of an image display body that switches a large number of images vividly and is rich in color change, but its manufacturing and processing steps are complicated, There is a problem that it is extremely expensive compared to printed matter. Moreover, since an aluminum vapor deposition film is used in many cases, the external appearance becomes a unique metallic tone.

  As described above, it is difficult for these technologies that can determine authenticity under natural light without using special authentication equipment to produce multiple latent images vividly with rich color changes in the same area. There are various problems that the manufacturing process is complicated and expensive.

  The present invention aims to solve the above-described problems, and allows a plurality of latent images to be clearly switched, has excellent color flip-flop properties, and can provide rich color expression to the latent image. An object of the present invention is to provide a printed latent image at a low cost.

  In an environment where light is incident from a certain direction, a convex structure strongly reflects light regularly around a plane that is normal to the incident light. If this convex structure has a certain degree of light reflectivity, the specular reflection surface gives a visual impression that the surface is raised, and the part where the light is not normal to the surface is a shadow. , It gives the impression that it is no longer visible or that the area has been reduced visually. This effect is further enhanced when a glossy convex structure is brought into close contact to form a convex aggregate.

  For example, if glossy convex lines are continuously arranged in parallel at a constant pitch, and light is irradiated to the convex parallel lines from a certain incident direction, the image looks as if it is convex. It looks as if all faces of the line are specularly reflecting light. In addition, even when the incident direction of light on the base material is changed, the entire surface looks as if the light is regularly regularly reflected, but only the surface in which the incident light is in the normal direction is actually seen. The light is selectively specularly reflected, and the positions of the reflecting surfaces respectively correspond to the positions in the light incident direction.

  On the other hand, when the image line 2 is formed on the image line 1 with an ink having a lower reflectance than the image line 1 on the image line 1 having a constant reflectivity with respect to light, the reflectivity of the light is reduced. Due to the difference, the image line 1 is a positive image line, the image line 2 formed with low reflectivity ink is a negative image line, and the image line 2 is a negative image line due to the difference in relative reflection characteristics in the regular reflection region. It comes out very clearly.

  The present invention uses the phenomenon that the position of the reflecting surface that strongly reflects and reflects light strongly according to the angle of incident light in a convex structure with high glossiness, and allows different latent images to be arranged at the same pitch. And the latent image is switched by shifting the phase and arranging them on the surface of the convex structure image. The latent image is given by forming a structure having a reflectance different from the convex structure image line on the convex structure image.

  The latent image printed material according to the present invention is formed on a base material by a convex structure image and a latent image composite image in which n (n is an integer of 2 or more) latent image images are synthesized on at least a part of the convex structure image. In the latent image printed matter having the latent image formed, the convex structure image is formed from a plurality of convex structure image lines having the same image line width and a predetermined pitch in a predetermined image line direction with colored pearl ink. The n latent image images are composed of an ink having a hue different from the interference color of the transparent ink or the pearl ink in the same image line direction with respect to the pitch of the convex structure image lines. It consists of a plurality of latent image lines having an image line width of 1 / n or less and the same line pitch, and the latent image combined image is a latent image line in each of the n latent image images. It is characterized by being comprised so that it may not mutually overlap.

  The latent image printed material according to the present invention is formed on a base material by a convex structure image and a latent image composite image in which n (n is an integer of 2 or more) latent image images are synthesized on at least a part of the convex structure image. In the latent image printed matter having the latent image formed, the convex structure image is composed of a plurality of convex structure pixels having the same shape, the same pixel area, and a predetermined pitch with colored pearl ink. , N latent image images are arranged in multiples with a pixel area of 1 / n or less and the same pixel pitch with respect to the convex structure pixels by ink having a hue different from the interference color of transparent ink or pearl ink. The latent image composite image is formed by shifting in one direction so that the latent image pixels in the n latent image images do not overlap each other.

  The latent image printed material of the present invention is characterized in that the colored pearl ink is formed containing a color pigment and an iris pearl pigment.

  The latent image printed material according to the present invention is characterized in that the color of the color pigment is a color that forms a complementary color relationship with the interference color of the iris pearl ink or a black color.

  In the latent image of the present invention, a plurality of latent images are clearly switched according to a change in the angle of light incident on the latent image.

  The high-gloss convex structure image of the present invention produces not only a mere change in brightness but also a vivid color change accompanied by a change in hue depending on the viewing angle.

  The latent image printed by the latent image printed matter of the present invention appears in the specular reflection region, and can be expressed in a color that combines two hues of the interference color of pearl and the color of the color pigment. Rich expression is possible.

  In the latent image printed matter of the present invention, even if the image form is such that three or more latent images are switched, an event that the images are mixed and observed can be prevented. As compared with the technique described in the item 3, it is possible to switch the latent image more clearly.

  In the present invention, the latent image is not visually recognized by simple contrast of the convex structure image generated in the specular reflection region, but by virtue of the color flip-flop property including the hue change of the convex structure image, a more vivid color is obtained. It is visually recognized by the contrast.

  In the prior art of Patent Document 3, the latent image needs to be formed of a transparent material. However, by coloring the convex structure image, the latent image is the same color as the convex structure image or a slightly lighter color. It became possible to color. Thereby, the reprint management of the latent image can be easily performed.

  In addition, the present invention is not limited to a metallic tone like a hologram, and a color pigment can be arbitrarily selected. It becomes possible to distribute without feeling uncomfortable. This is a major difference that makes the holograms and their effects different.

  The basic structure and specific image line configuration of the present invention will be described with reference to the drawings. The basic image line configuration and effects of the present invention are shown in FIGS. The reflection characteristics of the ink for forming the convex structure image of the present invention are shown in FIGS. FIGS. 7 to 10 show the first embodiment of the present invention, FIGS. 13 to 16 show the second embodiment, FIGS. 19 to 22 show the third embodiment, and FIGS. 23 to 27 show the fourth embodiment. .

Specifically, FIG. 1 shows an image line configuration of a convex structure image line in a convex structure image, and FIG. 2 shows an image line configuration of a latent image image line in a latent image composite image obtained by combining a plurality of latent images. . FIG. 3A shows a front view of the latent image print of the present invention, and FIG. 3B shows a side view of the latent image print of the present invention. FIG. 4A shows a state in which the convex structure image and the latent image composite image are imprinted. FIG. 4B shows a state in which the imprinting of the convex structure image and the latent image composite image is shifted. FIG. 4C shows a state of an image line in which the latent image can be visually recognized even when the alignment of the convex structure image and the latent image composite image is shifted. FIG. 5A and FIG. 5B show images that can be observed in the latent image print according to the positions of the respective light sources. FIG. 6 shows L ^* , a ^* , and b ^* for each light receiving angle of an ink containing only an iris color pearl pigment and an ink obtained by mixing a color pigment with an iris color pearl pigment. FIG. 7 shows only an iris color pearl pigment. The change of a ^* and b ^* of the ink which mixed the color pigment with the ink and the iris color pearl pigment is shown. FIG. 8A and FIG. 8B show basic images of two images that are visually recognized as latent images in one embodiment of the latent image printed matter, and FIG. 9 shows convex structure lines in the convex structure image. FIG. 10 shows the image line configuration of the latent image line in the latent image composite image formed by combining two latent image images. FIG. 11A and FIG. 11B show images that can be observed in the latent image print according to the positions of the respective light sources. 12 (a) to 12 (d) show basic images of four images visually recognized as latent images in one embodiment of the latent image printed matter, and FIG. 13 shows a convex structure image in a convex structure image. FIG. 14 shows an image line configuration of a latent image line in a latent image composite image formed by combining four latent image images. FIGS. 15A to 15D show images that can be observed in the latent image printed matter depending on the positions of the respective light sources. FIG. 16 shows L ^* , a ^* , and b ^* for each light receiving angle of an ink in which a colored pigment is mixed with the iris pearl pigment used in the embodiment and an ink in which only the iris pearl pigment is blended. Indicates the color difference ΔE of each latent image when the latent image printed material of the present invention is formed with an ink obtained by mixing a colored pigment in an iris pearl pigment and an ink containing only an iris pearl pigment. FIG. 18A and FIG. 18B show basic images of two images to be visually recognized as latent images in one embodiment of the latent image printed matter, and FIG. 19 shows a convex structure image line in the convex structure image. FIG. 20 shows the image line configuration of a latent image line in a latent image composite image formed by combining two latent image images. FIG. 21A is an image diagram of printing in one embodiment, and FIG. 21B is an image of a side view. FIGS. 22A and 22B show images that can be observed in the latent image print according to the positions of the respective light sources. FIG. 23A to FIG. 23D show basic images of four images to be visually recognized as latent images in one embodiment of the latent image printed material, and FIG. 24 shows a convex structure image in the convex structure image. FIG. 25 shows a pixel configuration of latent image pixels in a latent image composite image formed by combining two latent image images. FIG. 26A is an image diagram of printing in one embodiment, and FIG. 26B and FIG. 26C are images of side views when observed from AA ′ and BB ′. FIG. 27A to FIG. 27D show images that can be observed in the latent image print according to the positions of the respective light sources in a state where the observer faces the print.

  First, the basic structure of the present invention will be described with reference to the conceptual diagrams of the present invention shown in FIGS.

  FIG. 1 shows an image line configuration of the convex structure image (3). Each convex structure image line (3L) constituting the convex structure image (3) is composed of an image line width a and a pitch b. FIG. 2 shows a latent image composite image (4). The latent image composite image (4) refers to an image obtained by combining n (n is an integer of 2 or more) latent image images, and is exemplified by “P (4a)” and “N (4b)”. The letters “P” and “N” are formed of the same color ink. The formation method of the latent image composite image (4) shown in FIG. 2 is a method in which a basic image to appear first (in this case, two latent image characters “P” and “N”) is projected as shown in FIG. The latent image is divided with the same pitch b as the convex structure image line (3L) of the structure image (3) and an image line width of 1 / n or less with respect to the pitch b of the convex structure image line (3L). . Here, “n” of “1 / n” corresponds to the number of latent image images synthesized in the latent image synthesized image (4). An image line that forms a convex structure image (3) with the phase of either the latent image line (4aL) obtained by dividing each latent image "P" or the latent image image line (4bL) obtained by dividing "N". Are overlapped with a certain distance (b / 2 in this example) in the vertical direction. A single latent image composite image (4) is formed from a plurality of basic images by the above method.

  As shown in FIGS. 3 (a) and 3 (b), the convex structure image (3) in FIG. 1 and the latent image composite image (4) in FIG. 2 are formed on the substrate (2). A latent image printed matter (1) having a latent image body (5) is obtained. FIG. 3 (b) shows a side view of the latent image printed matter. The convex structure image line (3L) in the base material (2) and the convex structure image (3), and the latent image in the latent image composite image (4). This represents the vertical relationship between the image lines (4aL, 4bL), and the latent image image lines (4aL, 4bL) in the latent image composite image (4) are on the convex structure image lines (3L) forming the ridge structure. Is formed. Further, the latent image composite image (4) is colored in a hue different from the interference color of the transparent or convex structure image (3), and when the latent image print (1) is observed without being held over light, Not visible.

  When many latent images appear in the present invention, the image line width constituting each latent image becomes narrow. However, the appearing latent image is only an image formed on the image line of the convex structure image (3), and the latent image formed directly on the base material (2) (non-image line portion in the convex structure image). Since the image does not provide a contrast even when specularly reflected and cannot be visually observed, as shown in FIG. 4A, a latent image composite image (4) is formed on the non-image area in the convex structure image (3). ) Needs to be managed so that it is not formed.

  When the printing is shifted, for example, as shown in FIG. 4B, only the latent image “a” and the latent image “b” in the latent image composite image (4) are the images of the convex structure image (3). In the case where the latent image “c” is formed on the non-image portion of the convex structure image (3) and the produced latent image printed material is observed, the latent image “c” is formed on the line portion. The convex structure image (3L) in the convex structure image (3L) is hidden in the concave portion and cannot be viewed from any position.

  Therefore, in order to avoid such a state, as shown in FIG. 4C, the image of each latent image in the latent image composite image (4) is larger than the width of the non-image portion in the convex structure image (3). It is preferable to increase the line widths “a”, “b”, and “c”. By doing so, the line width of each latent image in the latent image composite image (4) is not formed only in the non-image line portion in the convex structure image (3) even if the printing is misaligned. Even if it is formed in the image line portion or over the convex structure image line (3L) in the adjacent convex structure image (3), all the latent images are observed when the produced latent image print is observed. The image becomes visible.

  The image lines of the latent image images forming the latent image composite image (4) do not necessarily have the same width (in this example, the image line width c). When the effect of widening or narrowing the authentication angle for each latent image is intended, it can be easily realized by changing the image line width for each latent image.

  Although the latent image composite image (4) formed by the above procedure is superimposed on the convex structure image (3), the authentication angle of each latent image changes at the position of superimposition. In this example, as shown in FIGS. 3A and 3B, the latent image line (4aL) in the latent image “P (4a)” is converted into the convex structure image in the convex structure image (3). The latent image of “N (4b)” at the left end of the line (3L) is arranged to be positioned at the right end of the convex structure image line (3L) in the convex structure image (3).

  FIG. 5 (a) shows an image that is visually recognized when light is incident on the latent image printed matter (1) from the left and the observer observes from directly above the latent image printed matter (1). b) shows an image that is visually recognized when light is incident on the latent image printed material (1) from the right and the observer observes from directly above the latent image printed material.

  As shown in FIG. 5 (a), when light is incident from the left, only the left surface of the convex structure image line (3L) in the convex structure image (3) having a ridge shape reflects light and colors. Changes. However, since the left side of the image line in the convex structure image (3) is covered with a low-gloss material in the shape of “P”, the color does not change only in the region of “P”, and the background has changed color. Is observed as a dark latent image letter “P”. As shown in FIG. 5B, when light is incident from the right, only the right surface of the convex structure image line (3L) in the convex structure image (3) having the same ridge shape reflects the light. The latent image character “N” formed on the right side of the image line in the convex structure image (3) is observed on the same principle as “P”. The above is the basic concept of an image line configured to switch a plurality of latent images.

  In order to carry out the present invention, an ink excellent in color flip-flop properties used for a convex structure image is required. This ink is preferably an ink having a large color change from the diffuse reflection region to the regular reflection region. In the present specification, an ink (hereinafter referred to as “colored pearl ink”) in which an iris color pearl pigment and a small amount of a color pigment are mixed is used.

  Since this ink forms a convex structure image using colored pearl ink, the color of the convex structure image in the specular reflection light region becomes the interference color of the iris pearl pigment, but the convex structure image in the diffuse reflection light region In other words, the color in the normal observation state is expressed by an intermediate color obtained by subtractive color mixture of the color of the color pigment and the color of the iris pearl pigment. It is preferable to select a colorless iris pearl pigment so that the color of the ink can be easily designed. However, the iris pearl pigment may be colored, and in that case, it may be selected in consideration of the subtractive color mixture of the color of the color pigment and the color of the iris pearl pigment in the diffuse reflection region.

  Convex structure image is formed using colored pearl ink, and the two latent image images (4a ′, 4b ′) shown in FIGS. 8A and 8B are switched with the latent image printed matter. This will be described while showing a specific image line configuration.

  First, Table 1 shows materials and blending ratios of the colored pearl ink used for the convex structure image of the latent image printed material in the present invention.

  Colored pearl ink made by mixing an iris color pearl pigment with an interference color of gold and a blue color pigment is recognized as blue when observed with diffuse reflected light. When it is regularly reflected, it has an excellent color flip-flop property in which the hue changes vividly from blue to gold.

FIG. 6 shows a solid printing sample having a dot area ratio of 100% formed with the ink shown in Table 1 by a screen printing method using UV drying, and the values of L ^* , a ^* , and b ^* of the solid printing sample are shown. This is a result of measurement using a variable angle spectral colorimetry system GCMS-4 type (manufactured by Murakami Color Research Laboratory Co., Ltd.) at a light receiving angle of -20 ° to 80 °. The incident light angle is 45 °. (6) shows L ^* of the printed material formed with the colored pearl ink, (7) shows a ^{* of} the printed material formed with the colored pearl ink, and (8) shows b ^{* of} the printed material formed with the colored pearl ink ^. Is shown.

In order to compare the difference between this ink and its color change, a comparative ink shown in Table 2 (hereinafter referred to as “colorless pearl ink”) was prepared. Similarly, a solid printing sample having a dot area ratio of 100% was prepared. Using a screen printing method of UV drying, L ^* , a ^* , and b ^* values of this solid printing sample were measured using a variable angle spectrocolorimetric system GCMS-4 (manufactured by Murakami Color Research Laboratory). The light receiving angle was measured from −20 ° to 80 °. Similarly, the angle of incident light is 45 °. (6 ′) indicates L ^* of the printed material formed with the colorless pearl ink, (7 ′) indicates a ^{* of} the printed material formed with the colorless pearl ink, and (8 ′) indicates the printed material formed with the colorless pearl ink. B ^* is shown.

  The colorless pearl ink shown in Table 2 uses an iris pearl pigment having the same interference color as that of the colored pearl ink shown in Table 1, but does not contain a colored pigment unlike the colored pearl ink shown in Table 1. Since only the iris pearl pigment is used as a pigment, when viewed with diffusely reflected light, it is almost colorless and transparent and invisible to the naked eye, but when specularly reflected, it changes from colorless to gold. It has the property that the hue changes.

  Comparing (6) and (6 ′) and (7) and (7 ′) and (8) and (8 ′), respectively, the observation angle region where diffuse reflected light is dominant (in this specification, −20 In the observation angle region (40 ° to 50 ° in this specification) in which specular reflection light is dominant, the values of the colored pearl and the colorless pearl are greatly different. It is almost the same value. From this, in the observation angle region where the diffuse reflection light is dominant, the color of the color pigment has a strong influence on the color of the printed matter, but in the observation angle region where the regular reflection light is dominant, It can be seen that the influence of the color becomes extremely weak, and the interference color of the iris pearl pigment has a strong influence on the color of the printed matter.

FIG. 7 shows a graph in which only changes in a ^* and b ^* are extracted from the data in FIG. 6 and a ^* is taken on the x axis and b ^* is taken on the y axis. (9) of the printed matter formed with colored pearl ink a ^*, b ^* of the indicated value shows the (9 ') is a printed matter formed by a colorless pearl ink a ^*, b ^* values. Compared with (9 ′), it can be seen that in (9), both the a ^* value and the b ^* value fluctuate greatly, and the hue change is much larger than in the case of no coloring.

  From the above results, the colored pearl ink in which the iris pearl pigment and the color pigment are mixed can observe the color of the color pigment in the observation angle region where the diffuse reflection light is dominant and the observation angle region where the regular reflection light is dominant. However, the interference color of the iris pearl pigment can be observed with almost no damage.

  Therefore, as compared with the case where the iris pearl pigment is used alone, the color flip-flop property from the observation angle region where the diffuse reflection light is dominant to the observation angle region where the regular reflection light is dominant is excellent.

  In the present invention, since the convex structure image is formed using the ink having particularly excellent color flip-flop properties as described above, the latent image does not float by mere contrast of light and dark as in the prior art, Since the difference in hue due to the color flip-flop property of the convex structure image is also added, the visibility is higher and the colors appear with rich colors.

  Specifically, the darkest part of the latent image can be expressed by the color of the color pigment, and the brightest part of the latent image, that is, the part where the latent image is not formed with matte ink, It is possible to express with the interference color of an iris pearl pigment. Needless to say, an intermediate color between the two colors can be represented according to the dot area ratio of the matte ink. When the color of the color pigment and the color of the iris pearl pigment are in a complementary color relationship or a relationship close thereto, the most colorful expression is possible.

  Next, the configuration of the latent image printed material in the present invention will be described. Using a general coated paper as a base material, a convex structure image (3 ′) shown in FIG. 9 was formed using the colored pearl ink shown in Table 1 by a UV dry screen printing method. The convex structure image line (3L ′) in the convex structure image (3 ′) is a continuous slit structure having a pitch of 0.4 mm, an image line width of 0.3 mm, and a non-image line width of 0.1 mm, and the image line height is , About 15 μm.

  The latent image composite image (4 ′) shown in FIG. 10 is formed on the convex structure image (3 ′) shown in FIG. 9 by using a UV dry offset printing method and using a mat varnish (UV mat OP varnish 3H manufactured by T & A TOKA). Formed.

  The latent image composite image (4 ′) shown in FIG. 10 includes the latent image line (4aL ′) in the latent image (4a ′) of FIG. 8A and the latent image (4b) of FIG. 8B. The latent image line (4bL ') in') is divided into lines with a pitch of 0.4 mm and an image line width of 0.18 mm, and the two latent image images are combined by shifting the phase by 0.2 mm. The latent image line (4aL ′) obtained by dividing the latent image (4a ′) shown in FIG. 8A is the convex structure image line (3L ′) in the convex structure image (3 ′) shown in FIG. The latent image line (4bL ′) located at the right end and obtained by dividing the latent image (4b ′) shown in FIG. 8B is a convex structure line in the convex structure image (3 ′) shown in FIG. A latent image body (5 ′) is formed by superimposing it so as to be positioned at the left end of (3L ′), and a latent image print (1 ′) having the latent image body (5 ′) on the substrate (2 ′) is formed. Produced.

  FIG. 11A shows an image that can be seen when there is a light source in the left direction and the viewpoint (10) is directly above the latent image body (5 ′) in the latent image printed matter (1 ′). Indicates an image that is visible when there is a light source in the right direction and the viewpoint (10) is directly above the latent image (5 ′) in the latent image print (1 ′). By slightly changing the position of the light source or the position of the viewpoint (10), the image inside the printed matter is extremely different from FIG. 8 (a) to FIG. 8 (b) or FIG. 8 (b) to FIG. 8 (a). It was confirmed that it switched clearly.

  In addition, the solid black image portions in FIGS. 11A and 11B are visually recognized as a color that strongly reflects the blue color of the color pigment, and other convex structure image portions (six The vertical line portion inside the square was visually recognized as a gold color which is an interference color of the iris pearl pigment, and it was confirmed that an image having a vivid color with two hues of blue and gold was visually recognized.

  Next, an example in which a moving image visual effect is imparted to a latent image using the latent image printed matter of the present invention will be described below.

  In order to impart a moving image-like visual effect to the latent image, it is preferable to realize an image configuration in which at least three latent images are switched with a slight change in observation angle. In this embodiment, the latent image (4a ″) shown in FIG. 12A to the latent image (4b ″) shown in FIG. 12B and the latent image (4c) shown in FIG. ''), Four characters having slightly different sizes, such as a latent image (4d '') shown in FIG.

  FIG. 13 shows an image line configuration of the convex structure image line (3L ″) in the convex structure image (3 ″). The image line of the convex structure image (3L ″) is a continuous slit structure having a pitch of 0.5 mm, an image line width of 0.4 mm, and a non-image line width of 0.1 mm. Using the colored pearl ink shown in Table 3, it was formed by screen printing of the UV drying method. The substrate is a general coated paper, and the image line height is about 15 μm.

  The object color is colorless, and the interference color is a black colored pearl ink made by mixing a golden iris pearl pigment and a black color pigment. When observed with diffuse reflected light, it is recognized as black. However, when it is regularly reflected, it changes to gold, and has excellent color flip-flop properties in which the hue changes vividly from black to gold. Further, the present colored pearl ink mixed with black has an effect of highlighting the interference color of the iris pearl in the regular reflection region very vividly.

  On the convex structure image (3 ″) shown in FIG. 13, a matte varnish (UV mat OP varnish 3H manufactured by T & A TOKA) is applied to the latent image composite image (4 ″) shown in FIG. 14 by the UV dry offset printing method. Formed using.

  The latent image composite image (4 ″) shown in FIG. 14 includes the latent image line (4aL ″) in the latent image (4a ″) of FIG. 12 (a) and the latent image of FIG. 12 (b). The latent image line (4bL ″) in the image (4b ″), the latent image line (4cL ″) in the latent image (4c ″) in FIG. The latent image line (4dL ″) in the latent image (4d ″) is divided into lines with a pitch of 0.5 mm and a line width of 0.125 mm, and the phase of each latent image is shown in FIG. 12 (b), FIG. 12 (c), and FIG. 12 (d) are combined by shifting by 0.125 mm in this order. The latent image line (4aL '') obtained by dividing the latent image (4a '') shown in FIG. 12A is converted into a convex structure line (3L) in the convex structure image (3 '') shown in FIG. ''), The latent image (4dL '') obtained by dividing the latent image (4d '') shown in FIG. 12 (d) is the convex structure image (3 '') shown in FIG. A latent image body (5 '') is formed by superimposing them on the right end of the convex structure image line (3L '') at the substrate, and the latent image body (5 '') is formed on the substrate (2 ''). A latent image print (1 ″) was prepared.

  FIG. 15A to FIG. 15D show an image that is visually recognized by the observer's viewpoint (10) depending on the positional relationship between the light source and the latent image printed matter (1 ″). As the position of the light source changes from left to right in the order of FIG. 15A to FIG. 15B, FIG. 15C, and FIG. 15D, the convex structure in the convex structure image (3 ″). The image of FIG. 12A located at the left end of the image line (3L ″) appears as shown in FIG. 15A, then changes to FIG. 12B and FIG. The image shown in FIG. 12D appears at the right end of the convex structure image line (3L ″) in the convex structure image (3 ″).

  In FIG. 15 (a) to FIG. 15 (d), the difference in the angle of the incident light that is inserted from the light source into the printed matter is within a very narrow range within 10 °. By slightly changing the position of the light source or the position of the viewpoint (10), the image inside the printed matter changes from FIG. 15 (a) to FIG. 15 (b) and FIG. 15 (c) to FIG. 15 (d). To do. When the incident angle of light is changed, it is also possible to change from FIG. 15D through FIG. 15C and FIG. 15B to FIG. 15A.

  In an observation environment where there are several lights that conform to a normal office, the latent image printed matter is held in the hand, and the four images are switched one after another by gently changing the angle from -5 ° to + 5 °. It has been confirmed that the characters “NPB” approach or move away, so that a visual effect called “zoom” is exhibited.

  15A to 15D is visually recognized as a color that strongly reflects the color of the color pigment, and other convex structure image portions (six The vertical line portion inside the square was visually recognized as a gold color which is an interference color of the iris pearl pigment, and it was confirmed that an image having a vivid color with two hues of black and gold was visually recognized.

  In addition, in order to compare the visibility with the conventional invention, the ink used for the convex structure image was changed to the colorless pearl ink shown in Table 2, and a latent image printed matter (1 ″) similar to Example 2 was obtained. It was fabricated and the sensory evaluation of the visibility and visibility of the visible latent image switch in a form requiring a multi-latent image (four) switch was performed. The sharpness of the switch is evaluated as bad when a plurality of latent images are mixed and visually recognized and is good when a latent image appears alone. The results are shown in Table 4. The latent image printed matter formed with the colorless pearl ink was designated as printed matter 1, and the latent image printed matter formed with the colored pearl ink was designated as printed matter 2. Regarding evaluation, ◎ was extremely good, ○ was good, Δ was normal, and X was bad.

  From the above results, as a result of visual observation, it was possible to evaluate that the printed matter 2 produced using the colored pearl ink was excellent in both the clearness of the latent image switch and the visibility of the latent image.

  Next, in order to confirm this result mechanically, the following confirmation was performed. First, in order to make a relative evaluation of the reflection characteristics of the colored pearl ink, the difference in the reflection characteristics between the colored pearl pigments shown in Table 3 and the colorless pearl ink shown in Table 2 was compared. The results are shown in FIG.

As a measuring method, a solid print sample having a dot area ratio of 100% is formed by a UV-drying screen printing method, and the values of L ^* , a ^* , and b ^* of the solid print sample are converted into a variable angle spectrocolorimetric system GCMS-. Using a type 4 (Murakami Color Research Laboratory), the light receiving angle was measured from −20 ° to 80 °. The angle of incident light is 45 °.

(6 ″) in FIG. 16 is the lightness L ^* for each light receiving angle in the colored pearl ink in Table 3, and (7 ″) is a ^* for each light receiving angle in the colored pearl ink in Table 3. (8 ″) is b ^* for each light receiving angle in the colored pearl ink of Table 3. (6 ′), (7 ′) and (8 ′) are L ^* , a ^* and b ^* measured in the same manner for the colorless pearl ink shown in Table 2. In the present colored pearl ink shown in Table 3, although the hue change is slightly smaller than that of the ink shown in Table 1, it is possible to keep the lightness in the angular region where diffuse reflection is dominant, even lower. The highest point of brightness at the regular reflection angle (45 °) is a characteristic that hardly changes. As a result, the reflection characteristic of the lightness change has changed from a gentle curve to a curve showing a sharp shape that suddenly rises and falls sharply.

  With this reflection characteristic, it is possible to more narrowly limit the surface angle at which the regular reflection of the surface of the convex structure image is strongly reflected. This effect is considered to prevent the phenomenon that a plurality of latent images are visually mixed to be visually recognized compared with the case where colorless pearl ink is used. Even in the form of switching, it is presumed that it has led to a high evaluation that the switch is clear.

Further, in order to relatively evaluate the difference in the visibility of the latent image, the color difference was mechanically calculated and measured. As a measuring method, a solid image formed with the colored pearl ink in Table 3 is used as a printed material A, and a matte varnish (UV mat OP varnish 3H manufactured by T & A TOKA) is used on the printed material A, and a 100% solid image is also superimposed. An image formed in combination is referred to as a printed matter B. Thereafter, L ^* , a ^* , and b ^* of the printed matter A and the printed matter B are changed from −20 ° to 80 ° using a variable angle spectrocolorimetric system GCMS-4 (manufactured by Murakami Color Research Laboratory). The color difference (11) for each light receiving angle of the printed matter B when the printed matter A was used as a reference was calculated from the measured values. This is shown in FIG.

  The printed matter A has the same structure as a part of the image line of the convex structure image in the present invention, and the printed matter B has the same structure as the part of the image line in which the mat varnish is superimposed on the convex structure image in the present invention. The color difference (11) of the printed material B with reference to A represents the visibility of the latent image of the latent image printed material in a pseudo manner. As a comparison object, the color difference (11 ') of the latent image when the colorless pearl ink shown in Table 2 was similarly used for the convex structure image was calculated.

  From the graph of FIG. 17, it can be seen that there is a difference of nearly 50 in the color difference between the case where the colored pearl ink is used for the convex structure image and the case where the colorless pearl ink is used. Compared with the case of using pearl ink, it was also confirmed mechanically that the visibility of the latent image can be made extremely high.

  Next, an example will be described in which a latent image printed material with better visibility is formed by performing screen printing twice. In the embodiments described so far, the convex structure image is formed by screen printing and the latent image composite image line is formed by offset printing. However, in this embodiment, both the convex structure image and the latent image composite image line are formed by UV. It is formed by a dry screen printing method.

  When a latent image appears when the surface structure of a convex structure image is added with fine irregularities according to the presence or absence of the latent image by forming a certain amount of bulge in the composite image of the latent image It is possible to further improve the visibility.

  In the present embodiment, two latent image images (4a "", 4b "") shown in FIGS. 18A and 18B are switched. FIG. 19 shows an image line configuration of the convex structure image line (3L ″ ″) in the convex structure image (3 ″ ″). The convex structure image line (3L ′ ″) is a continuous slit structure having a pitch of 0.3 mm, an image line width of 0.2 mm, and a non-image line width of 0.1 mm. It was formed by screen printing by UV drying method using pearl ink. The substrate is general fine paper, and the image line height is about 15 μm.

  On the convex structure image (3 ′ ″) shown in FIG. 19, the latent image composite image (4 ′ ″) shown in FIG. Type Reicure OP, manufactured by Jujo Chemical Co., Ltd.).

  The latent image composite image (4 ′ ″) shown in FIG. 20 is the same as the latent image line (4aL ′ ″) in the latent image (4a ′ ″) of FIG. The latent image line (4bL ′ ″) in the latent image (4b ″ ′) is divided into lines with a pitch of 0.3 mm and a line width of 0.13 mm, and the phase of each latent image is set to 0. 0. They are combined by shifting every 15 mm.

  FIG. 21A and FIG. 21B show a convex structure image (3 ′ ″) in FIG. 19 and a latent image composite image (4 ′ ″ in FIG. 20) on a substrate (2 ′ ″). ) And a latent image printed matter (1 ′ ″) having a latent image body (5 ′ ″) formed. A latent image image line (4aL ′ ″) obtained by dividing the latent image image (4a ′ ″) shown in FIG. 18A is converted into a convex structure image line (3 ′) in the convex structure image (3 ′) shown in FIG. 3L ′ ″), the latent image line (4bL ′ ″) obtained by dividing the latent image (4b ′ ″) shown in FIG. 18B is a convex structure shown in FIG. A latent image body (5 ′ ″) is formed by overlapping so as to be positioned at the lower end of the convex structure image line (3L ′ ″) in the image (3 ′), and has the latent image body (5 ′ ″). A latent image print (1 ″ ′) was produced. FIG. 21B shows a side view along A-A ′ of FIG. By forming the latent image composite image (4 ′ ″) by the UV dry screen printing method, fine irregularities reflecting the latent image can be formed on the surface of the convex structure image (3 ′ ″). . As a result, a latent image with higher visibility can appear.

  FIG. 22A and FIG. 22B show the latent image (5 ′ ″) that is visible to the observer's viewpoint (10) depending on the positional relationship between the light source and the latent image print (1 ′ ″). It is. When the light source is positioned above the latent image printed matter (1 '' '), the viewer's viewpoint (10) is visually recognized as shown in FIG. When the light source is located below the printed material, the viewer's viewpoint (10) is visually recognized as shown in FIG.

  In FIG. 22A to FIG. 22B, the difference in the angle of incident light that is inserted from the light source into the printed material is in a very narrow range of 1 to 10 °.

  In addition, the image portion shown in solid black in FIGS. 22A to 22B is visually recognized as a color that strongly reflects the color of the color pigment, and other convex structure image portions (clouds). It was confirmed that the inner horizontal line portion) was visually recognized as a gold color which is an interference color of the iris color pearl pigment, and an image having a vivid color with two hues of black and gold was visually recognized.

  Next, the form which forms a convex structure image with a pixel is demonstrated. When forming a convex structure image in the form of an image line group, the direction in which the printed image is tilted to switch the latent image is limited to either the vertical or horizontal direction. By forming the structure image, the effect of generating a latent image switch in both the vertical and horizontal directions is added. Here, the “pixel” is a halftone dot shape that is used as an element for forming a convex structure image or a latent image composite image and that expresses a change in shading with an area ratio (the size of a point). Further, the shape of the pixel is not limited to the pixel shape described in this embodiment, but is a minimum shape unit such as a polygon, a circle, and an ellipse.

  In this embodiment, four latent image images (4a ″ ″, 4b ″ ″, 4c ″ ″, 4d ″ ″ shown in FIGS. 23 (a) to 23 (d) are used. ) Switch. FIG. 24 shows a pixel configuration of the convex structure pixel (3D) in the convex structure image (3 ′ ″ ″). The convex structure pixels (3D) constituting the convex structure image (3 ″ ″) are continuously vertically and horizontally with a pitch of 0.5 mm across a non-image line of 0.1 mm of a diamond with a side of 0.4 mm. It is arranged continuously. A convex structure image (3 '' '' ') was formed by screen printing by the UV drying method using the colored pearl ink shown in Table 3. The substrate is a general coated paper, and the pixel height is about 15 μm.

  The latent image composite image (4 ″ ″) shown in FIG. 25 was formed on the convex structure image shown in FIG. 24 by using a mat varnish (UV mat OP varnish 3H manufactured by T & A TOKA) by the UV dry offset printing method. .

  The latent image composite image (4 ″ ″) shown in FIG. 25 is the same as the latent image pixel (4aD) in the latent image (4a ″ ″) of FIG. 23 (a) and the latent image of FIG. 23 (b). The latent image pixel (4bD) in the image image (4b ″ ″), the latent image pixel (4cD) in the latent image image (4c ″ ″) in FIG. 23C, and the latent image pixel in FIG. The latent image pixel (4dD) in the image image (4d ″ ″) is divided into diamond-shaped pixels with a pitch of 0.5 mm and 0.2 mm × 0.2 mm, and the phase of each latent image is 0.25 mm. They are shifted and placed vertically and horizontally and combined.

  26 (a), 26 (b) and 26 (c) show the convex structure image (3 ″ ″) of FIG. 24 and the latent image of FIG. 25 on the substrate (2 ″ ″). It is a latent image printed matter (1 ″ ″) having a latent image body (5 ″ ″) formed with the image composite image (4 ″ ″). The latent image pixel (4aD) obtained by dividing the latent image (4a ″ ″) shown in FIG. 23A is a convex structure pixel (3D) in the convex structure image (3 ″ ″) shown in FIG. ), And the latent image pixel (4bD) obtained by dividing the latent image (4b ″ ″) shown in FIG. 23B is a convex structure image (3 ″ ″ shown in FIG. 24). 24), the latent image pixel (4cD) obtained by dividing the latent image (4c ″ ″) shown in FIG. 23C is located at the lower end of the convex structure pixel (3D) in FIG. A latent image pixel (4dD) located at the left end of the convex structure pixel (3D) in the image (3 ″ ″) and obtained by dividing the latent image (4d ″ ″) shown in FIG. A latent image (5 '' '') is formed by superimposing it so as to be positioned at the right end of the convex structure pixel (3D) in the convex structure image (3 '' '' shown in FIG. And, to prepare a Senzotai (5 '' '') a latent image printed matter having a (1 '' ''). FIG. 26B shows a side view along A-A ′ in FIG. 26A, and FIG. 26C shows a side view along B-B ′ in FIG. As in the past, the latent image composite image (4 '' '' ') is formed on the convex structure image (3' '' '').

  FIG. 27A to FIG. 27D show the latent image (5 ′ ″) that is visually recognized by the observer's viewpoint (10) depending on the positional relationship between the light source and the latent image print (1 ″ ″). '). When the light source is positioned above the latent image printed matter (1 '' '' '), it is visually recognized by the observer as shown in FIG. When the light source is positioned below the latent image printed matter (1 ″ ″), the viewer visually recognizes it as shown in FIG. 27B, and the light source is located on the left side of the latent image printed matter (1 ″ ″). When positioned, the viewer visually recognizes as shown in FIG. When the light source is positioned on the right side of the latent image printed matter (1 "'"), it is visually recognized by the observer as shown in FIG.

  In FIG. 27A to FIG. 27D, the difference in the angle of the incident light that is inserted from the light source into the printed matter is an extremely narrow range of 1 to 10 degrees in both the horizontal and vertical directions.

27A to 27D, the image portion indicated by solid black is visually recognized as a color that strongly reflects the color of the color pigment, and other convex structure image portions (six The halftone part inside the square was visually recognized as a gold color which is an interference color of the iris pearl pigment, and it was confirmed that an image having a vivid color with two hues of black and gold was visually recognized.

  In the present specification, only two kinds of colored pearl inks are used. However, the color of the colored pigment and the interference color of the pearl pigment are extremely abundant, and are not limited to the colors used this time. In any case, if the color of the color pigment and the color of the iris pearl pigment are complementary or close to each other, a rich expression is possible, and the color of the color pigment is close to black. In this case, the visibility of the latent image can be kept high, and the interference color of pearl in the regular reflection area can be felt vividly.

  As for the pearl pigment used for forming the convex structure image of the present invention, a dichroic pearl pigment, an iris pearl pigment, or other scaly pigments may be used. By using colored pearl ink, even when a pearl pigment having a relatively low interference effect is used, a sufficient color change can be visually recognized. The particle size of the pearl pigment is selected according to the printing method to be used, but is preferably 1 to 50 μm, and the average particle size is about 5 to 15 μm.

  In addition, in order to achieve a further interference effect of pearl, in order to improve the orientation (leafing effect) of the scaly pigment, the pearl pigment which has been treated so that the pigment is oriented on the surface of the rising line drawing Is preferably used. Specifically, for example, by performing surface treatment such as water repellency and oil repellency treatment as described in JP-A-2001-106937, the pigment can be oriented on the surface of the image line of the printing portion, It becomes possible to make the interference color of pearl by specular reflection light appear more vividly.

  Further, in the present specification, an ink having excellent color flip-flop properties is prepared by mixing a colored pigment and an iris pearl pigment, but mica coated with titanium dioxide is further coated with a colored metal oxide, or When the latent image print of the present invention is formed using dichroic pearls that are colored pearl pigments by coating mica directly with colored metal oxides, the colored pigments are mixed as described herein. Even if not, it is possible to exert the same effect. However, there are few dichroic pearl pigments at present, the color selectivity is low, and the color flip-flop property is slightly lower than the ink used in the present invention. As described in the book, it is preferable to use a mixture of an iris pearl pigment and a color pigment.

  The latent image composite image in the embodiment of the present invention was applied only by the offset printing method and the screen printing method, but it can be implemented by any printing method such as a gravure printing method, a relief printing method, and a flexographic printing method. Needless to say, the method can be carried out by partially cutting off the image line by laser irradiation or by transferring white ink or transparent ink with a printer. When processing methods such as printing with a printer or laser irradiation are used, the image resolution of the latent image is often lowered due to the problem of processing accuracy, but unlike printing that requires plate making, a latent image is instantly added. There is an advantage that variable information such as a different number or face image can be given to each printed matter.

It is a figure which shows the image line structure (conceptual figure) of the convex structure image line in the convex structure image which comprises the latent image printed matter of this invention. It is a figure which shows the image line structure (conceptual figure) of the latent image image line in the latent image composite image which comprises the latent image printed matter of this invention. It is a figure which shows the front view (conceptual figure) and side view (conceptual figure) of the latent image printed matter of this invention. It is a figure which shows the printing state of a convex structure image and a latent-image composite image. It is a figure which shows the image which a latent image printed matter is observed when a light source exists in the left or right side of a perpendicular | vertical direction with respect to a slit with respect to the latent image printed matter described in FIG. It is a figure which shows L ^* , a ^* , b ^{* according} to the light reception angle of the colorless pearl ink and the colored pearl ink used for the convex structure image of the latent image print of the present invention. It is a figure which shows a ^* and b ^{* according} to the light reception angle of the colorless pearl ink and the colored pearl ink used for the convex structure image of the latent image print of the present invention. It is a figure which shows the basic image of the one latent image in one Example of this invention. It is a figure which shows the image line structure (conceptual figure) of the convex structure image line in the convex structure image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the image line structure (conceptual figure) of the latent image image line in the latent image composite image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the image observed from a latent image printed material front, when a light source exists in the left side or right side of a perpendicular | vertical direction with respect to a slit with respect to the latent image printed material in one Example of this invention. It is a figure which shows the basic image of the one latent image in one Example of this invention. It is a figure which shows the image line structure (conceptual figure) of the convex structure image line in the convex structure image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the image line structure (conceptual figure) of the latent image image line in the latent image composite image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the image observed in latent image printed matter by the positional relationship of the light source in one Example of this invention, latent image printed matter, and an observer's viewpoint. It is a figure which shows L ^* , a ^* , b ^{* according} to the light reception angle of the colorless pearl ink and the colored pearl ink used for the convex structure image of the latent image print of the present invention. It is a figure which shows the color difference according to the light reception angle in each latent image, when a latent image print is formed using a colorless pearl ink and when a latent image print is formed using a colored pearl ink. It is a figure which shows the basic image of the one latent image in one Example of this invention. It is a figure which shows the image line structure (conceptual figure) of the convex structure image line in the convex structure image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the image line structure (conceptual figure) of the latent image image line in the latent image composite image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the front view and side view of the image which overlap | superposed the convex structure image and latent image synthetic image in one Example of this invention. It is a figure which shows the image observed in latent image printed matter by the positional relationship of the light source in one Example of this invention, latent image printed matter, and an observer's viewpoint. It is a figure which shows the basic image of the one latent image in one Example of this invention. It is a figure which shows the pixel structure (conceptual figure) of the convex structure pixel in the convex structure image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the pixel structure (conceptual figure) of the latent image pixel in the latent image composite image which comprises the latent image printed matter in one Example of this invention. It is a figure which shows the front view and side view of the image which overlap | superposed the convex structure image and latent image synthetic image in one Example of this invention. It is a figure which shows the image observed in latent image printed matter by the positional relationship of the light source in one Example of this invention, latent image printed matter, and an observer's viewpoint.

Explanation of symbols

1, 1 ′, 1 ″, 1 ′ ″, 1 ″ ″ latent image print 2, 2 ′, 2 ″, 2 ′ ″, 2 ″ ″ base material 3, 3 ′, 3 ′ '3''', 3 '''' Convex structure image 3L, 3L ', 3L'',3L''' Convex structure image line 3D Convex structure pixels 4, 4 ', 4'',4''', 4 ″ ″ latent image composite image 4aL, 4aL ′, 4bL, 4bL ′ latent image line 5, 5 ′, 5 ″, 5 ′ ″, 5 ″ ″ latent image 6 formed with colored pearl ink L ^{* of} printed material
6 'L ^{* of} printed matter formed with colorless pearl ink
6 "L ^{* of} printed matter formed with colored pearl ink
7 a ^{* of} printed matter formed with colored pearl ink
7 'a ^{* of} printed matter formed with colorless pearl ink
A ^{* of} printed matter formed with 7 "colored pearl ink
8 b ^{* of} printed matter formed with colored pearl ink
B ^{* of} printed matter formed with 8 'colorless pearl ink
B ^{* of} printed matter formed with 8 "colored pearl ink
9 Printed product formed with colored pearl ink 9 ′ Printed product formed with colorless pearl ink 10 Viewpoint 11 Color difference ΔE of latent image based on convex structure image in this latent image printed product formed with colored pearl ink
11 ′ Color difference ΔE of latent image based on convex structure image in the latent image printed matter formed with colorless pearl ink

Claims (3)

A latent image formed on a substrate by a convex structure image and a latent image composite image in which n (n is an integer of 2 or more) latent image images are combined on at least a part of the convex structure image. In a latent image printed matter having an image body,
The convex structure image is made of colored pearl inks containing a color pigment and an iris pearl pigment , and a plurality of ridge-shaped convex arrays arranged at a predetermined pitch with the same line width in a predetermined line direction. The surface of the convex structure image line is formed by orienting the iris pearl pigment,
The n latent image images are separated by n minutes with respect to the pitch of the convex structure image lines in the same image line direction with respect to the convex structure image lines by using ink having a hue different from the interference color of the transparent ink or the pearl ink. And a plurality of latent image lines arranged at the same line pitch,
The latent image composite image is configured so that the latent image lines in the n latent image images do not overlap each other. A latent image formed on a substrate by a convex structure image and a latent image composite image in which n (n is an integer of 2 or more) latent image images are combined on at least a part of the convex structure image. In a latent image printed matter having an image body,
The convex structure image is formed from colored convex pearl inks containing a colored pigment and an iris pearl pigment , and a plurality of ridge-shaped convex structure pixels having the same shape, the same pixel area, and a predetermined pitch. The surface of the convex structure image line is formed by orienting the iris pearl pigment,
The n latent image images may be a plurality of pixels having a pixel area of 1 / n or less and the same pixel pitch with respect to the convex structure pixels by using a transparent ink or an ink having a hue different from the interference color of the pearl ink. Consisting of arranged latent image pixels,
The latent image composite is formed by shifting the latent image pixel in any direction so that the latent image pixels in the n latent image images do not overlap each other. 3. The latent image printed matter according to claim 1, wherein the color of the color pigment is a color that is complementary to the interference color of the iris pearl ink or a black color.

Images