JP2018024105A - Latent image printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent image printed matter which prevents lowering of visibility of color moire patterns having a plurality of color tones even when the color moire patterns are arranged in the periphery of a latent image appearing under regularly reflected light, and has rich color tone.SOLUTION: In a latent image printed matter, a semicylindrical element group, in which semicylindrical-like elements which are formed of a material containing resin and have a semicylindrical shape are arranged in a hatched manner, is laminated on a light reflection layer having at least one optical property of a light-dark flip-flop property and a color flip-flop property, a light reflection element group in which light reflection elements having different color tones from that of the light reflection layer under regularly reflected light and having at least one optical property of the light-dark flip-flop property and the color flip-flop property are arranged in a hatched manner, and a latent element group in which latent image elements in which base images are divided and/or compressed are arranged in the hatched manner are sequentially laminated on the semicylindrical-like element group, and the semicylindrical-like element group and the light reflection element group are arranged so that at least one of a pitch, an arrangement angle and a shape is different from one another.SELECTED DRAWING: Figure 1

Description

  In the field of security printed matter such as banknotes, passports, securities, identification cards, cards, and passports that require anti-counterfeiting effects, the present invention changes the image with excellent color expression by the incidence of light. The present invention relates to a latent image printed matter having high authenticity discrimination and counterfeit resistance that produces an effect or a visual effect like a moving image.

  The image change effect of switching between multiple images and the moving image effect of moving images tend to be eye-catching and difficult to counterfeit. . A typical technology with these effects is holograms, which are widely used in various forms with change effects and video effects, and are also affixed to security prints that require high security such as banknotes and passports. It has been.

  On the other hand, in addition to holograms, there are also true / false discriminating elements that use known techniques such as parallax barriers and lenticulars, and that have image change effects in which multiple images are switched by slight angle changes, and video effects that make the images appear to move. Already exists.

  However, although holograms are used for various security printed materials such as banknotes, there are significant problems in the complexity of the manufacturing process and high manufacturing costs compared to general printed materials. Truth discrimination elements using a parallax barrier, lenticular, microlens array, etc. require a clear layer or lens, so the base material is almost limited to plastic, and the printed material has a certain thickness (at least 150 μm) However, it cannot be used for printed matter with a limited thickness, and tends to be used only for plastic cards that allow a certain thickness.

  In order to solve the above problems, the present applicant is a technique for forming a latent image line group by superimposing a latent image line group on a high-gloss and ridge-like line group. An application has been filed for a forgery prevention technique that realizes an effect of changing a plurality of latent images in accordance with an observation angle (see, for example, Patent Document 1 and Patent Document 2). In this technique, when light is incident on the saddle-shaped image line at a specific angle, only the surface of the image line of the saddle-shaped image line group that forms an angle orthogonal to the incident light strongly reflects the light. By utilizing the phenomenon, only a part of the latent image of the latent image line group superimposed on the surface of the image line reflecting the light is visualized by the difference in reflected light amount and color. This technology can be formed with a thickness of about one-tenth that of a parallax barrier or lenticular, and the manufacturing technology can be easily implemented by utilizing conventional plate making technology and printing technology. And it has the outstanding characteristic that the printed image provided with the change effect similar to a hologram can be formed at the same cost as a general printed matter.

  In addition, as a technique applying these techniques of Patent Document 1 and Patent Document 2, a phenomenon in which fine patterns interfere with each other and is visually recognized as an expanded moire pattern by sampling a part of the pattern (moire expansion). And a technique that realizes a special three-dimensional visual effect and a moving image visual effect using an integral photography image line configuration (for example, Patent Document 3, Patent Document 4, and Patent) Reference 5). This technique has an effect that a latent image appearing under specular reflection light appears to move to the left and right with a stereoscopic effect according to the angle of incident light and the observation position of the observer.

  In addition, there is a technique that realizes the effects of the techniques of Patent Document 1 to Patent Document 5 by a combination of embossing and a light reflecting element group (for example, see Patent Document 6). There is also a technique in which the effect of color change is further enhanced by using the principle of the technique from Patent Document 1 to Patent Document 5 (see Patent Document 7 and Patent Document 8).

Japanese Patent No. 4682283 Japanese Patent No. 4660775 Japanese Patent No. 4844894 Japanese Patent No. 5131789 Japanese Patent No. 5200284 JP 2013-240918 A JP 2014-083721 A JP 2014-108576 A

  In any of the techniques described in Patent Literature 1 to Patent Literature 6, due to restrictions based on the principle of the effect expression, the color that can represent an image that appears under specular reflection light is such that the saddle-like element group is under diffuse reflection light. To colors that can be emitted under regular reflected light. Assuming that the saddle-shaped element group has color flip-flop properties, it can be expressed under specular reflection light if it has a characteristic of being black under diffuse reflection light and changing to gold under normal reflection light. The color is only a gradation of the composite color from dark black to light gold. In addition, the base image formed by the latent image element group has the maximum brightness of the color of the saddle-shaped element group under specular reflection light. As a result, only darker colors can be expressed. As described above, the colors that can be expressed in a printed image in each technology are governed by the optical characteristics of the saddle-shaped element group. There is a limit to the color representation area that can be expressed by a single element, and as a result, there is a problem that the color expression area that can be applied to a printed image is narrow.

  Further, the problem arises that the color expression range that can be applied to the above-mentioned printed image is narrow, and as shown in FIG. 20A, the background around the base image (f) that appears under specular reflection light. In addition, there is a design restriction that it is preferable to have a blank area (g) in which no image exists. Specifically, as shown in FIGS. 20B and 20C, the base image (f) appearing under specular reflection light and the background adjacent to the base image (f) are more impacted. When a pattern (h, i) different from the base image (f) is arranged for the purpose of providing a change effect or dynamic effect of a certain image, the colors that can be expressed in the printed image are limited as described above. Therefore, the base image (f) and the pattern (h, i) can be expressed only in completely the same color belonging to the same hue, or only in different colors only in brightness and darkness. There is a problem that the visibility of the base image (f) and the pattern (h, i) is mutually impaired. This problem is more conspicuous when a pattern that causes movement such as the moire pattern (i) is arranged in the background. This is because the moire pattern (i) is not simply composed of the same ink as the base image (f) on the same plate surface as the simple pattern (h), but the same as the base image (f). This is due to the fact that only a part of the information of the pattern is sampled to cause movement by partially interfering according to the same rule as the image line. That is, since the base image (f) and the moire pattern (i) have the same ink and printing plate and the same principle and effect of causing movement, the contrast is more offset than the simple pattern (h). Cheap. As described above, when the moire pattern (i) that causes movement is arranged around the base image (f) as compared with the form having the blank around the base image (f) shown in FIG. There was a problem that the visibility of both the image (f) and the moire pattern (i) was impaired.

  In the techniques of Patent Document 7 and Patent Document 8, in order to greatly expand the color expression under specular reflection light, not only the optical characteristics of the saddle-shaped element group but also the color of the latent image element group are used simultaneously to express the color expression. This technology has the effect of expanding the area. However, in this embodiment, unlike the techniques of Patent Document 1 to Patent Document 6, the latent image element group is not transparent and has a structure that is colored with a specific color. It will be visually recognized. For this reason, the technique described in Patent Document 7 loses the function of causing a latent image that is not visible under diffusely reflected light to appear under specularly reflected light, and only has the effect of changing the color of the entire printed image. End up. Further, in the technique described in Patent Document 8, a special image line configuration in which a negative-positive image line is paired is applied to the latent image element group, and the function of causing a latent image to appear under specular reflection light has the function of Although guaranteed, the change effect is greatly impaired by coloring the latent image element group, and the number of latent image images that can be expressed and the concealment performance are reduced.

  In addition, in the techniques of Patent Document 1 to Patent Document 8, in addition to the base image that appears only under specular reflection light, it is visible under diffuse reflection light and disappears under indirect reflection light and becomes invisible. It was possible to give a visible image. In this case, the visible image expresses shading by the difference in the area ratio of the bowl-shaped element group. However, by changing the area ratio of the saddle-shaped element group, the sampling period of the latent image element group is disturbed, and the change effect and moving image effect are impaired, or the saddle-shaped element that is a set of three-dimensional shaped lines The group had a problem that a high-resolution visible image could not be expressed.

  The present invention has been made to solve the above-mentioned problems, and the regular reflection light can be obtained by superimposing the ridge-like image line group, the light reflection element group and the latent image element group having a bulge on the light reflection layer. Increases the amount of reflected light, enables rich color expression with multiple hues, high visibility of the appearing latent image, and even if a moire pattern is placed around the base image, the visibility of each does not decrease A latent image printed matter is provided.

  In order to achieve the above-mentioned object, the invention described in claim 1 is provided on at least a part of a base material on a light reflection layer having at least one of light / dark flip-flop property and color flip-flop property. , A cocoon-shaped element group in which transparent or colored cocoon-shaped elements having a cocoon shape formed of a resin-containing material are arranged in a line, and is laminated on the cocoon-shaped element group under specular reflection light. A light reflecting element group in which hues are different from those of the light reflecting layer and light reflecting elements having at least one of light-dark flip-flop property and color flip-flop property are arranged in a line, and a base image is divided and / or Latent image element groups in which compressed transparent latent image elements are arranged in a line are sequentially stacked, and the saddle-like element group and the light reflecting element group are different in at least one of element pitch, arrangement angle, and shape. Arranged As a result, the element groups interfere with each other and the hue of the light reflecting layer and the light reflecting element group is different under specular reflection light, so that a color moire pattern having a plurality of hues is formed, and the substrate reflects specular light. When the image is observed while continuously changing the observation angle below, the latent image print is changed and / or dynamically visually recognized, and the color moire pattern is dynamically visually recognized.

  According to a second aspect of the present invention, in the latent image printed matter according to the first aspect, at least one of the saddle-shaped element group or the light reflecting element group is transparent, and the light reflecting element group has a density difference due to a difference in area ratio. It is formed by forming a visible image. When the substrate is observed under diffuse reflected light, only the visible image is visible, and when observed under regular reflected light, a color moire pattern appears, and the visible image disappears and is not visible. Features.

  Invention of Claim 3 was formed with the material containing resin on the light reflection layer provided with the optical characteristic of at least one of the light-and-dark flip-flop property or the color flip-flop property at least in part on the base material. A cocoon-shaped element group in which transparent cocoon-shaped elements having a cocoon shape are arranged in a line is laminated, and on the cocoon-shaped element group, the hue is different from that of the light reflection layer under specular reflection light, and light and dark flip-flop Alternatively, a light reflecting element group in which light reflecting elements having at least one optical property of color flip-flop properties and having a color different from that of the base material under diffuse reflected light are arranged in a line, and under diffuse reflected light A printed image is formed by sequentially laminating or juxtaposing the latent image elements having the same hue as the light reflecting element group and the divided and / or compressed latent image elements arranged in a line. , Light anti The element group is configured with a density obtained by subtracting the density of the latent image line group from the density of the printed image under diffuse reflected light, and the saddle-like element group and the light reflecting element group have at least the pitch, arrangement angle, and shape of the element. When one element is arranged differently, the element groups interfere with each other, and the hue of the light reflecting layer and the light reflecting element group is different under regular reflection light, thereby forming a color moire pattern having a plurality of hues. When the substrate is observed under regular reflection light while continuously changing the observation angle, the latent image is changed and / or dynamically visually recognized and the color moire pattern is dynamically visually recognized. It is a latent image print.

  In the invention according to claim 4, at least one of the bowl-shaped element group or the light reflecting element group is transparent, and the light reflecting element group is formed by forming a visible image with a density difference due to a difference in area ratio. When viewed under diffusely reflected light, only a visible image is visible, and when observed under regular reflected light, a color moire pattern appears, and the visible image disappears and is not visible.

  The color in the printed image of the latent image printed material of the present invention does not depend only on the optical characteristics of the saddle-like element group as in the prior art, and is combined with a light reflecting element group different from the saddle-like element group. This makes it possible to express a color moire pattern with two or more different hues, and is superior in color expression during regular reflection as compared with the prior art.

  Further, since the color of the color moire pattern has a hue different from that of the base image that appears as a latent image and a different color, the visibility of the base image is not impaired. For this reason, the design which arrange | positions a color moire pattern adjacent to a base image can be used.

  In addition, the visibility of the color moire pattern is usually greatly affected by the original performance of the ink constituting the light reflecting element group, that is, the brightness of the ink itself (the amount of reflected light). Therefore, in order to make a color moire pattern excellent in color expression appear, it is necessary to use an expensive ink with high luminance. However, the light-reflecting element group of the present invention is not directly formed on the base material, but overlaps the ridge-shaped element formed of the ink resin. For this reason, the amount of light reflected by the light reflecting element group printed on the ink resin is greatly increased by adding the amount of light according to the amount of reflected light of the ink resin as the base in addition to the amount of reflected light of the light reflecting element group itself. Therefore, the reflected light amount of the light reflecting element group printed on the ink resin is remarkably larger than the reflected light amount of the light reflecting element group printed with the same ink on normal fine paper or coated paper. This makes it possible to maintain high visibility of latent images and color moire patterns that appear under regular reflection light even when inexpensive ink with low luminance is used.

  In the present invention, in addition to the base image that appears only under specular reflection light, in addition to the base image that appears only under specular reflection light, a visible image that disappears under specular reflection light and becomes invisible is given. Is possible. In the present invention, the visible image is formed by providing the light reflecting element group with light and shade depending on the difference in area ratio. Originally, the disappearance effect of the visible image is caused by a phenomenon in which light and shade cannot be visually observed due to an increase in the amount of reflected light during regular reflection. Therefore, this disappearance effect is further increased in proportion to the amount of reflected light during regular reflection of the light reflecting element group. As described above, in the present invention, since the amount of reflected light of the light reflecting element group is remarkably increased, the disappearance effect of the visible image is remarkably increased as compared with the prior art. And, the increase in the shade difference of the visible image that can be lost at the time of regular reflection means that the range of the shade of the visible image that can be given under diffuse reflected light is expanded. It became possible to form a visible image with a high contrast. Further, since the light reflecting layer does not require a three-dimensional structure, it can be formed by offset printing, letterpress printing, flexographic printing, and the like, and even a high-resolution visible image can be easily expressed. As described above, the visible image is formed by the light reflecting element group, so that the visibility is higher than that of the conventional technique and a high-resolution visible image can be provided.

The latent image printed matter of this invention is shown. The schematic diagram of the latent image printed matter of this invention is shown. 3 shows a group of hook-like elements of the latent image printed material of the present invention. 2 shows a latent image element group of the latent image printed material of the present invention. The lamination order of the latent image printed matter of this invention is shown. The light reflection element group of the latent image printed matter of this invention is shown. FIG. 3 shows a schematic view of a printed image of the present invention reflecting incident light. The effect of the latent image printed matter of the present invention is shown. The movement of the color moire pattern of the background of the latent image printed matter of the present invention is shown. 2 shows a latent image element group of a moire enlargement method for a latent image printed material of the present invention. The effect of the latent image printed matter of the present invention is shown. 3 shows an IP system latent image element group of a latent image printed material according to the present invention. The effect of the latent image printed matter of the present invention is shown. An example of the structure of the light reflection element group of the latent image printed matter of this invention is shown. The latent image printed matter of this invention is shown. The light reflection element group of the latent image printed matter of this invention is shown. The lamination order of the latent image printed matter of this invention is shown. FIG. 3 shows a schematic view of a printed image of the present invention reflecting incident light. The effect of the latent image printed matter of the present invention is shown. The problem of the conventional latent image printed matter is shown.

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

(First embodiment)
As a first embodiment, the latent image element group (6) constituting the latent image printed matter (1) of the present invention is transparent, and the light reflecting element group (7) and the latent image element group (6) are superimposed. The form to perform is demonstrated. A basic configuration of the latent image printed material (1) according to the present invention will be described with reference to FIGS. Note that “transparent” does not need to be completely transparent, and may be in a state of transparency that does not completely hide colors and images in the lower layer, that is, translucent. Therefore, “transparent” in the present invention is defined as including a translucent state.

  FIG. 1 shows a latent image print (1) of the present invention. The latent image printed material (1) has a printed image (3) on a substrate (2). The base material (2) only needs to have a flat surface on which the printed image (3) can be formed, and the material is not particularly limited, such as fine paper, coated paper, plastic, metal, and the like. In addition, there is no restriction | limiting in particular also about the color and magnitude | size of a base material (2). The color of the printed image (3) may be transparent, colored, or any color as long as it exhibits a color that can be visually observed during regular reflection. However, in the first embodiment, since the characters “JPN” that can be visually recognized under diffuse reflected light are represented, the print image (3) will be described as being colored with a specific object color.

  FIG. 2 shows an outline of the print image (3). In the printed image (3), first, a light reflecting layer (4) is formed on a substrate (2), a ridge-shaped element group (5) is further formed thereon, and a latent image element group (6) and light are further formed thereon. The reflection element group (7) is formed by overlapping. Significant information appearing during regular reflection is included in the latent image element group (6). In this example, the latent image element group (6) includes the first latent image element group (6A) representing the alphabet “A” as the first significant information and the alphabet “B” as the second significant information. The second latent image element group (6B) representing

  The light reflection layer (4) in the latent image printed material (1) of the present invention may be any color, and may be transparent or colored. The size of the printed image (3) may be the same as that of the printed image (3), and conversely, the area of the light reflecting layer (4) is larger than the printed image (3). ) And not just a design modifier. The light reflection layer (4) needs to have at least one optical characteristic of light / dark flip-flop or color flip-flop. This is an essential configuration for forming the latent image printed matter (1) rich in color by changing the color of the latent image printed matter (1) under diffuse reflected light and regular reflected light. When formed with colored inks that do not have such optical properties, the same color is always visible under diffuse reflection and regular reflection, and only a monotonous change is given to the color under regular reflection. The evil that it is not possible arises.

  The “light / dark flip-flop property” in the present invention is a property that the brightness increases when specularly reflected, and the “color flip-flop property” indicates a property that the hue changes when specularly reflected. Light and dark flip-flops can be obtained by printing only the varnish component, but more excellent characteristics can be easily imparted by blending common metal pigments such as aluminum, brass and iron oxide into the ink. Can do. Further, the color flip-flop property can be imparted by blending a functional material having the color flip-flop property into the ink. Specific examples of functional materials having color flip-flop properties include pearl pigments, cholesteric liquid crystals, glass flake pigments, metal powder pigments, and scale pen-like metal pigments. Naturally, not only the functional material is blended into the ink, but also the light reflecting element group (7) is formed by using an ink marketed as an ink having a light / dark flip-flop property or a color flip-flop property. Also good. Commercially available inks having light and dark flip-flop properties include gold ink and silver ink, OP varnish and gloss varnish having high gloss of the resin itself, and commercially available inks having color flip-flop properties include CSI (Color Shifting Ink) and OVI. (Optical Variable Ink), liquid crystal ink, and the like.

  Further, the light reflecting layer (4) may be formed by printing, may be formed by pasting a film, or may be formed by coating or spraying, and the application method thereof is not limited. On the light reflecting layer (4), the elements imparted by the printing of the saddle-shaped element group (5), the latent image element group (6), and the light reflecting element group (7) are overlapped. It is desirable that The above is the description of the light reflecting layer (4).

  Subsequently, the bowl-shaped element group (5) will be described. FIG. 3 shows an example of the bowl-shaped element group (5) formed on the substrate (2). The saddle-like element group (5) is a straight line having a constant width (W1), and the saddle-like elements (8) having a saddle shape having a constant rising height are arranged in a line. In the present invention, “arranged in a line” means a state in which a plurality of elements are regularly arranged at a predetermined pitch. More specifically, the hook-shaped elements (8) are continuously arranged at a constant pitch (P1) in a first direction (S1 direction in the figure) orthogonal to the image line direction. In the present embodiment, the saddle-like element group (5) will be described with respect to an example in which the saddle-like element group (5) is configured by a collection of saddle-like image lines having a bulge. However, the present invention is not limited to this, and a pixel-shaped saddle-like element group (5) may be formed by arranging pixels having swells as elements in the vertical and horizontal directions at an equal pitch.

  The bowl-shaped element group (5) needs to be made of a material containing resin. The resin here refers to a resin having a certain gloss that hits a varnish component of a general printing ink such as a urethane resin, an acrylic resin, an alkyd resin, an epoxy resin, a polyester resin, and a phenol resin. The configuration in which the unevenness is directly formed on the base material (2) by filling or embossing does not satisfy the essential requirements of the present invention. This is because when the base material (2) is made of the same material, the effect of increasing the amount of light reflected by the light reflecting element group (7) formed on the bowl-shaped element group (5) cannot be obtained. It is. In addition, since the reflected light amount of the saddle-shaped element group (5) finally plays a role of increasing the reflected light amount of the light-reflecting element group (7), it is desirable that the reflected light amount of the saddle-shaped element group (5) is high. . That is, the higher the gloss of the bowl-shaped element group (5), the higher the visibility of the final latent image.

  In addition, the collar-like element group (5) may be any color, and may be transparent or colored, but achieves both visibility and color expression of the color moire pattern (15) under specular reflection light. In order to achieve this, it is desirable that the saddle-shaped element group (5) is transparent so that the hue of the lower light reflection layer (4) can be reflected in the color moire pattern (15). In addition, the width (W1) and the pitch (P1) of the hook-shaped element group (5) are the same size, there is no gap between the hook-shaped elements (8) arranged in a line, and the hook-shaped elements ( 8) When they are in contact with each other, the saddle-shaped element group (5) must be transparent. If the wrinkle-shaped element group (5) is formed with colored ink that completely hides the color of the lower layer, the hue of the light reflecting layer (4) in the lower layer of the wrinkled-element group (5) is changed to a color moire pattern. This is because (15) cannot be reflected at all. The details of the principle by which the color moire pattern (15) is visually recognized under regular reflection light will be described later. In the first embodiment, an example in which the bowl-shaped element group (5) is transparent will be described.

  In general, when the ridge-like element group (5) is formed by UV curable screen printing, the higher the viscosity of the screen ink, the higher the height of the ridge-like element (8), and the respective ridge-like elements ( The three-dimensional solid shape of 8) tends to be uniform with each other. Such a uniform structure of the saddle-like element (8) is extremely desirable for enhancing the visibility and clarity of the latent image. Therefore, in forming the saddle-like element group (5) of the present invention, the viscosity It is desirable to use a high ink. The above is the description of the bowl-shaped element group (5).

  Next, the latent image element group (6) will be described with reference to FIG. The latent image element group (6) includes a plurality of pieces of significant information that is a basis of a latent image that appears during regular reflection. The example of the present embodiment includes two pieces of significant information, that is, alphabet “A”, which is the first significant information, and alphabet “B”, which is the second significant information. Each image representing the significant information is referred to as a base image (13). In the present embodiment, the alphabet “A” is the first base image (13A), and the alphabet “B” is the second base image (13B). In the present embodiment, the first significant information represented by the first base image (13A) is represented by the first latent image element group (6A) shown in FIG. The second significant information represented by 13B) is represented by the second latent image element group (6B) illustrated in FIG. In the first latent image element group (6A), the first latent image element (9A) having a constant image line width (W2) is in the same first direction (S1 direction) as the bowl-shaped element group (5). The second latent image element group (6B) is continuously arranged in the shape of a line at the same pitch (P1), and the second latent image element group (6B) has a constant image line width (W3). Are arranged continuously in a single line at the same pitch (P1) in the same first direction (S1 direction) as the bowl-shaped element group (5). The first latent image element (9A) has the same line width (W2), and the second latent image element (9B) must have the same line width (W3). The image line width (W2) of the latent image element (9A) and the image line width (W3) of the second latent image element (9B) may be the same or different. The total length of the image line widths (W2, W3) of the latent image elements (9A, 9B) must not exceed the arrangement pitch (P1).

  Here, the positional relationship between each first latent image element (9A) and the second latent image element (9B) will be described. The first latent image element (9A) and the second latent image element (9B) must not overlap. Specifically, the first latent image element (9A) and the second latent image element (9B) need to be out of phase in the first direction (S1). FIG. 4A shows, as an example, a state in which the pitch (P1) is shifted by half (1/2). If the first latent image element (9A) and the second latent image element (9B) are arranged so as to overlap each other, the first significant information and the second significant information are obtained at a specific observation angle under specular reflection light. Such an arrangement must be avoided because an indistinct image appears in which significant information overlaps. In the following description, the latent image element (9) will be described in the case of referring to the entire latent image element, not specifically the individual latent image elements (9A, 9B).

  As described above, the information (image) that the producer intends to appear as a latent image under specular reflection light is the base image (13), and the base image (13) is divided in accordance with the configuration of the present invention. An image subjected to processing such as compression (processing such as compression will be described later) is a latent image element group (6), and each element constituting the latent image element group (6) is a latent image. Element (9).

  The color under diffuse reflection of each latent image element (9) constituting the latent image element group (6) may be originally transparent or colored, but as described above, In the embodiment, a mode in which the latent image element group (6) is transparent will be described. The form in which the latent image element group (6) is colored will be described in the second embodiment. In the first embodiment, the latent image element group (6) is described as an image line. However, the present invention is not limited to this, and the bowl-shaped element group (5) is assumed to be a pixel form. In this case, it is desirable that the latent image element group (6) is not an image line but a corresponding pixel form.

  The optical characteristics required for the latent image element group (6) vary depending on the layer structure of the printed image (3). As shown in FIG. 5A, in the layer structure of the printed image (3), the latent image element group (6) is superimposed on the bowl-shaped element group (5), and the light reflecting element group (7) is formed thereon. In the case of a layer structure in which the layers overlap, in order to increase the visibility of the base image (13) appearing under specular reflection light, the surface characteristics of the saddle-shaped element (8) and the latent image element (9) are greatly different. It is desirable that The “surface property” in the present invention refers to the state of the surface of each printed element.

  The reason is described below. When the latent image element (9) overlaps with the bowl-shaped element (8), and further the light-reflecting element group (7) overlaps, the light-reflecting element group (7) is compared with the bowl-shaped element (8). Because of the thin film thickness, the difference in surface property between the bowl-shaped element (8) and the latent image element (9) is reflected in the light reflecting element group (7). That is, the light reflecting element group (7) superimposed on the smooth bowl-shaped element (8) has a relatively smooth surface and the light reflecting element group superimposed on the rough latent image element (9). (7) has a relatively rough surface. Basically, the difference in surface property between the saddle-shaped element (8) and the latent image element (9) is relatively reflected as the difference in surface property between the light reflecting element groups (7), and the difference is reflected in the base image (13). ) Directly connected to the visibility. Conversely, when the difference in surface property is small, it is filled with the film thickness of the light reflecting element group (7), and the difference in surface property is not reflected on the surface of the light reflecting element group (7). The visibility of the base image (13) that appears under reflected light is reduced.

  From the above, as shown in FIG. 5A, a layer in which the latent image element group (6) is superimposed on the bowl-shaped element group (5) and the light reflecting element group (7) is superimposed thereon. In the case of the structure, in order to increase the visibility of the base image (13) appearing under specular reflection light, the surface characteristics of the saddle-shaped element (8) and the latent image element (9) are greatly different. Is desirable. In addition, since the difference in surface property of the light reflecting element group (7) is slightly filled with the printed film thickness of the light reflecting element group (7), the original bowl-shaped element (8) and the latent image element (9) Slightly smaller due to the difference in surface properties. In view of this, it is desirable to increase the difference in surface properties as much as possible.

  Since it is difficult to express the specific range of the surface property difference with a numerical value that can easily measure the surface property difference in a fine region, the brightness at regular reflection, which is a value highly correlated with the surface property In other words, a brightness difference of at least a brightness L * of 10 or more is required between the bowl-shaped element (8) and the latent image element (9). In many cases, since the saddle-like element (8) has a high gloss structure, it is desirable that the latent image element (9) has a low gloss. That is, it is desirable that the brightness of the bowl-shaped element (8) is high and the brightness of the latent image element (9) is low. In addition, when the brightness difference L * is less than 10, it is a case where the latent image becomes unclear, and must be avoided.

  Further, as shown in FIG. 5B, the layer structure of the printed image (3) is such that the light reflecting element group (7) is superimposed on the bowl-shaped element group (5), and further the latent image element group ( In the case of a layer structure in which 6) overlaps, the light reflecting element group (7) and the latent image element group (6) are specularly reflected in order to increase the visibility of the base image (13) that appears under specularly reflected light. It is desirable that the color of the time is greatly different. Specifically, the light reflection element group (7) and the latent image element group (6) need to have a color difference ΔE of 10 or more different during regular reflection. When the color difference ΔE is less than 10, the color difference between the light reflecting element group (7) and the latent image element group (6) is small, and the latent image may be unclear. In the case of this layer structure, the latent image element group (6) may have a light / dark flip-flop property or a color flip-flop property, and in this case, a richer color expression is possible.

  As described above, the optical characteristics required for the latent image element group (6) vary depending on the layer structure of the printed image (3). The optical characteristics required for the latent image element group (6) in the form in which the latent image element group (6) is colored will be described in the second embodiment. Further, depending on the image line configuration of the latent image element group (6), not only the base image (13) is changed to another base image (13) under specular reflection light, but also the base image (13) that appears. There is also a form that produces a moving image effect that appears to move, but the configuration of the latent image element group (6) that causes these moving image effects will be described later. The above is the description of the latent image element group (6).

  Next, the light reflecting element group (7) will be described. The light reflecting element group (7) formed on the saddle-shaped element group (5) is formed so as to be superimposed on the saddle-shaped element group (5), so that the printed image (3) has a significantly strong positive polarity. It is a printed layer that has a function of generating reflected light and has excellent light reflection characteristics.

  As shown in FIG. 6, in the first embodiment, an information part (7A) representing characters of significant information “JPN” visible under diffuse reflected light, and a background part (7B) forming the background thereof. Consists of. The information part (7A) and the background part (7B) must be separated at least in part by the thickness of the image line. In the example of the first embodiment, the light reflecting elements (10) having a thick line width (W4) are continuously arranged in a line in all areas of the information portion (7A), and the background portion ( In all the regions 7B), the light reflecting elements (10) having a narrow line width (W5) are continuously arranged in a line shape, so that the light reflecting element group (7 ) Represents specific significant information.

  In the first embodiment, the information portion (7A) has a thick line width and the background portion (7B) has a thin line width. However, the information portion (7A) has a thin line width. There is no problem even if the background portion (7B) has a thick line width. In the first embodiment, the light reflecting element (10) is described as an image line. However, the present invention is not limited to this, and the case where the bowl-shaped element (8) is in a pixel form is assumed. For this, it is desirable that the light reflecting element (10) is not an image line but a corresponding pixel form.

  In the first embodiment, the light reflecting element group (7) is continuously arranged in the first direction at a second pitch (P2) different from the first pitch (P1). It is sufficient that at least one of pitch, shape is different from the bowl-shaped element group (5). This is an essential requirement for causing the light reflecting element group (7) and the hook-shaped element group (5) to interfere with each other to generate a moire pattern. If only the pitch is changed, the second pitch (P2) is preferably about 80% to 120% of the first pitch (P1), and if only the direction is changed. The second direction is preferably an angle of plus or minus 10 degrees or less with respect to the first direction. In the case of a numerical value outside this range, moire does not occur or the generated moire movement is small and unsuitable. Further, when the shapes are different, the shape of the light reflecting element group (7) is reflected in the shape of the moire where the shape of the light reflecting element group (7) appears due to a phenomenon called “moire magnification phenomenon”. If the moiré-shaped element group (5) is a pixel and a moire having a specific shape is caused to appear by using “Moire Magication”, the configuration described in Japanese Patent No. 3338860 is used as the light-reflecting element group (7). Apply to the above. In addition, when the saddle-shaped element group (5) is an image line, the configuration described in Japanese Patent No. 4427796 and Japanese Patent No. 5131789 may be applied to the light reflecting element group (7). However, since the present invention is premised on forming by printing, it is desirable to avoid a shape that requires high resolution. When the saddle-shaped element group (5) is an image line, it is desirable to apply an image line having a simple shape such as a curve or a wavy line to the light reflecting element group (7). In any case, basically, at least one light-reflecting element (10) is formed so as to overlap on all the bowl-shaped elements (8).

  As in the first embodiment, in the case where significant information visible under diffuse reflected light is expressed by the thickness of the image line, it is necessary to have an object color, but under diffuse reflected light, In the form that does not represent the significant information visible with, the light reflecting element group (7) may be transparent.

  Further, the light reflecting element group (7) needs to have at least one optical characteristic of light / dark flip-flop property or color flip-flop property. In addition, the color of the light reflecting element group (7) during regular reflection is light The color and hue at the time of regular reflection of the reflective layer (4) need to be different. Specifically, when the color at the regular reflection of the light reflection layer (4) is yellow, the color at the regular reflection of the light reflection element group (7) is a hue other than yellow, that is, red, blue, Must be green, white, etc. This is a change to a color moire pattern (15) by adding a plurality of hues to the moire pattern that appears when the saddle-shaped element group (5) and the light reflecting element group (7) interfere under regular reflection light. This is a necessary condition.

  In the latent image printed matter (1) of the present invention, at least one of the saddle-like element group (5) and the light reflecting element group (7) needs to be transparent. This is to avoid the appearance of a moire pattern due to interference between the hook-shaped element group (5) and the light reflecting element group (7) under diffuse reflection light.

  In addition, even if the light reflection element group (7) is transparent or colored, the effect of the present invention can be obtained. However, when the light reflecting element group (7) is transparent, the surface of the image line that reflects the incident light becomes two surfaces of the light reflecting element group (7) and the bowl-shaped element (8). Thus, when there are two reflecting surfaces, even if the difference in the distance between the reflecting surfaces (the thickness of the light reflecting element group (7)) is 1 μm or less, only a small amount of reflected light is generated from the two reflecting surfaces. The phase difference affects the sharpness of the latent image (the naked eye can be seen as if the latent image is simply blurred, but in reality, the two latent images appear at slightly shifted positions simultaneously. Therefore, the latent image may be unclear. For this reason, in the latent image printed material (1) of the present invention, it is more desirable that the light reflecting element group (7) is colored when the latent image is intended to appear clearly.

  The light-reflecting element group (7) is above the saddle-shaped element group (5) that has been printed and hardened in any of the layer structures of FIGS. 5 (a) and 5 (b). It is formed. As described above, the light reflecting element group (7) has a structure in which a plurality of light reflecting elements (10) are arranged at a specific pitch, and basically, on all the bowl-shaped elements (8). And at least one light reflecting element (10).

  In the case of the form of FIG. 5A, as shown in FIG. 7A, the cross-sectional structure is further above the latent image elements (9A, 9B) superimposed on the bowl-shaped element (8). The light reflecting element group (7) is formed to overlap. Since the surface properties of the saddle-shaped element (8) and the latent image elements (9A, 9B) are different, the light reflecting element group (7) composed of an ink layer having a constant film thickness is formed on the layer. The difference in surface property is reflected by the difference in surface property of the light reflecting element group (7), although it is slightly reduced by being filled with the ink layer of the light reflecting element group (7). Therefore, when light is incident on the surface of the light reflecting element group (7), the amount of reflected light increases in the region where the bowl-shaped element (8) exists under the light reflecting element group (7). In the region where the latent image element (9) is present under the group (7), the amount of reflected light is small. That is, as shown in FIG. 5A, even when the light-reflecting element group (7) overlaps the saddle-shaped element (8) and the latent image elements (9A, 9B), the saddle-shaped element is not visible under regular reflection light. The difference in surface property between the element (8) and the latent image elements (9A, 9B) is reflected as the magnitude of the amount of reflected light generated from the light reflecting element group (7). In the area where the light reflecting element group (7) overlaps the bowl-shaped element (8), the rough three-dimensional structure such as the height and width of the foundation-shaped bowl-shaped element (8) is reflected as it is. On the other hand, slight unevenness on the surface of the image line of the saddle-like element (8) is filled to some extent immediately after printing by the film thickness of the light reflecting element group (7). For this reason, the surface when the light-reflecting element group (7) overlaps the bowl-shaped element (8) is smoother than the surface of the original bowl-shaped element (8), and the amount of reflected light is larger. The sharpness of the base image (13) appearing under the reflected light will be improved.

  On the other hand, in the case of the form of FIG. 5 (b), as shown in FIG. 7 (b), the cross-sectional structure is such that the light reflecting element group (7) is superimposed on the bowl-shaped element (8). Further, the latent image elements (9A, 9B) are formed to overlap each other. In this form, as in the form of FIG. 5 (a), the rough three-dimensional structure such as the height and width of the ridge-like element (8) as a base is reflected as it is, and the ridge-like element (8) The slight unevenness on the surface of the image line is filled with the film thickness of the light reflecting element group (7), becomes smoother than the surface of the original bowl-shaped element (8), and the amount of reflected light also increases. On the other hand, in the region where the latent image elements (9A, 9B) overlap with the light reflecting element group (7), the amount of reflected light is significantly reduced by blocking incident light reaching the light reflecting element group (7) below. descend. As described above, the difference in presence or absence of the latent image elements (9A, 9B) is reflected as the amount of reflected light under regular reflection light.

  5A and 5B, the light reflecting element group (7) does not need to be formed only on the bowl-shaped element (8). It may be formed in a non-image portion between the element (8) and the bowl-shaped element (8). The above is the description of the light reflecting element group (7).

  The effect of the latent image printed material (1) of the present invention will be described with reference to FIG. First, when the latent image print (1) is observed under diffuse reflected light, only the letters “JPN” of the alphabet are visually recognized in the first embodiment (not shown). Under diffuse reflection, the base image (13) and the moire pattern do not appear and are completely invisible.

  Next, the effect under regular reflection light will be described. Under regular reflection light, first, the alphabet “JPN” visually recognized under diffuse reflection light disappears visually. This is because the density of the entire image becomes light (the brightness increases) due to regular reflection of the light reflecting element group (7), and the density difference between the characters “JPN” and the surrounding area (the brightness difference) is compressed and reduced. This is because it cannot be caught visually.

  In addition, when light is incident on the latent image printed matter (1) from the light source (11) on the left side as shown in FIG. 8 (a), the viewer (12) is given the alphabet “A” which is the first significant information. The first base image (13A) of “and the color moire pattern (15) having a hue different from that of“ A ”are visually recognized. On the other hand, as shown in FIG. 8B, when light is incident on the latent image printed matter (1) from the right side, the observer (12) has the second significant information of the alphabet “B” as the second significant information. The base image (13B) and the color moire pattern (15) having a hue different from “B” are visually recognized. Further, the color moire pattern (15) appearing in the background appears to move continuously from side to side by changing the inclination of the latent image print (1) as shown in FIG. Actually, the effect that the significant information visually recognized in the printed image (3) changes according to the change in the angle of the incident light and the effect that the color moire pattern (15) appears to move simultaneously are exhibited. Further, since the hue of the significant information to be changed and the color moire pattern (15) are different, the visibility of each is not impaired.

  The “color moiré pattern” as used in the present invention is not a moiré pattern, which is a pattern generated by the interference of two or more element groups, but is simply composed of light and shade (light and dark) differences. It is composed of For example, even if it is a moire pattern having a specific hue, for example, a moire pattern composed of dark red and light red and having the same hue difference is represented by a color moire pattern (15). It must be a moire pattern in which red and blue are combined, or a moire pattern in which colors of different hues such as yellow and white are combined.

  The reason why the above effects are produced will be described. Of the effect of changing the base image (13) and the effect of moving the color moire pattern (15), the effect of changing the base image (13) will be described first. The arrangement of the bowl-shaped element (8) and the latent image elements (9A, 9B) is as shown in FIGS. 7 (a) and 7 (b) from the center of the rise of the bowl-shaped element (8). The description will be made on the assumption that the first latent image element (9A) is arranged on the left side, and the second latent image element (9B) is arranged on the right side from the center of the rising of the bowl-shaped element (8). As shown in FIG. 8A, when light is incident on the latent image printed material (1) from the left side, the light reflecting element group (7) is formed on the ridge-like element (8) having a bulge. , The light is strongly reflected around only the surface normal to the incident light. The light reflecting element group (7) has a structure in which a plurality of light reflecting elements (10) are arranged at a specific pitch, and at least one light reflecting element (10) is formed on all the bowl-shaped elements (8). ) Overlap. For this reason, on the left side from the center of the rise in the surface of the light reflecting element group (7), the light is strongly reflected and the color changes. On the left side of the light reflecting element group (7), it is invisible under normal observation conditions, but the first latent image element formed of a material having a different surface property and brightness at the time of regular reflection from the saddle-like element (8) (9A) is formed, and the first latent image element (9A) is visualized in a color different from the surroundings due to the difference in the color of the reflected light. In this case, since all the first latent image elements (9A) are visualized at a time, as a result, the first significant information represented by the first latent image element group (6A) of the alphabet “A” ( 13A) appears. On the other hand, since the right surface cannot reflect light from the center of the rise of the light reflecting element group (7), which is not normal to the incident light, the color does not change, and as a result, the first surface on the right surface is not changed. The second latent image element (9B) is not visualized and the second significant information does not appear.

  On the contrary, as shown in FIG. 8B, when light is incident on the latent image printed matter (1) from the right side, the second latent image element (9B) on the right side of the light reflecting element group (7) is The alphabet “B”, which is visualized by the difference in color and is the second significant information represented by the second latent image element group (6B), appears. In this case, the first latent image element (9A) on the left surface is not visualized, and the first significant information does not appear.

  As described above, among the latent image elements (9) superimposed on the surface of the image line of the bowl-shaped element (8), the latent image element existing on the side of the light reflecting element group (7) that is normal to the incident light. Only the image element (9) is visualized by the difference in color, and the other latent image element (9) is not visualized. As a result, an effect of changing the image visually recognized in the printed image (3) according to the change in the angle of the incident light is produced. The above is the principle that the change effect of the base image (13) of the latent image printed matter (1) of the present invention occurs.

  Subsequently, in addition to the effect of changing the base image (13) under specular reflection light, a color moire pattern (15) having a color different from that of the base image (13) appears, and the principle of moving the effect by changing the tilt is generated. Will be described. Since the light reflecting element group (7) and the bowl-shaped element group (5) are different in at least one of the direction, the pitch, and the shape under the specularly reflected light, the moire pattern appears when the two elements interfere with each other. The moiré pattern that appears at this time is a moiré pattern with only light and shade (brightness and darkness) due to the intensity of the reflected light. The specularly reflected light having a hue different from that of the reflected light is generated between the saddle-shaped element group (5) and the saddle-shaped element group (5) or is transmitted through the saddle-shaped element group (5). The color moire pattern (15) is obtained by adding a difference in hue to the moire pattern with only light and shade.

  Temporarily, the light reflection element group (7) is gray under diffuse reflection light and white under specular reflection light having only light and dark flip-flop properties, and the light reflection layer (4) is diffuse reflection light. If it is transparent below and has a color flip-flop property and is yellow under specular reflection light, the hook-shaped element group (5) and the light reflection element group (7) interfere with each other, and the specular reflection light Underneath, a moire pattern having only white shades from gray (color under diffuse reflected light of the printed image) appears, and the color of the moire pattern (15) is changed by replacing the yellow of the light reflecting layer (4) with gray. Become. The gray area of the moire pattern is an area where the interference between the saddle-shaped element group (5) and the light reflecting element group (7) is weak, and the color of this area is canceled by the hue of the light reflecting layer (4) existing on the lower surface. Yellow is strongly reflected. On the other hand, the white area of the moire pattern is an area where the interference between the saddle-shaped element group (5) and the light reflecting element group (7) is strong, and this area has a white hue of the light reflecting layer (4) existing on the lower surface. The white color is strongly reflected. As a result, white and yellow color moire patterns (15) having different hues appear.

  The principle of the appearance of the moire pattern and the pattern formation method are apparent from Japanese Patent No. 4844894 and Japanese Patent No. 5131789. In the present invention, the light reflecting element group (7) and the hook-shaped element group (5) must be transparent at least one of the light reflecting element group (7) and the hook-shaped element group (5). Therefore, this color moiré pattern (15) is invisible under diffuse reflection light, and the color of the light reflection element group (7) and the bowl-shaped element group (5) is different only under regular reflection light. (15) is visualized only under specular reflection light. The positional relationship of which position in the saddle-like element group (5) the light-reflecting element group (7) overlaps is different in each saddle-like element group (5), and the angle of incident light changes. The surface of the ridge-like element group (5) having a swell and the light reflecting element group (7) superimposed on the ridge-like element group (5) changes. Due to this change, the appearing color moire pattern (15) appears to move. The above is the principle in which the color moiré pattern (15) of the latent image print (1) of the present invention appears to move.

  The base image (13) that appears is mainly caused by the interference between the saddle-like element group (5) and the latent image element group (6) (depending on the form, the interference with the light reflecting element group (7) is also simultaneous. Occurs.) Here, since the latent image element group (6) functions to suppress regular reflection of the bowl-shaped element group (5) and the light reflection element group (7) immediately below the latent image element group (6), the base image that appears under regular reflection light. (13) is the color of the printed image (3) under diffuse reflected light (the color in which the saddle-like element group (5), the light reflecting element group (7), the latent image element group (6), etc. are overlapped). (It does not change from the same color as under diffuse reflection). On the other hand, the moire pattern is a pattern generated by the interference between the light reflecting element group (7) and the bowl-shaped element group (5). Therefore, the light reflecting element group (7) and the light reflecting layer (4) under specular reflection light. It is colored in two colors with different hues. Normally, when two different hues are overlapped, the synthesized color becomes a subtractive color mixture or a uniform composite color by additive color mixture. However, the color moire pattern (15) is created by the strength of whether the two patterns partially or weakly interfere with each other, and forms a pattern. The strength and weakness of the region where the other pattern is emphasized and the region where the two colors are combined are born. Therefore, the color moire pattern (15) does not become a uniform composite color such as a simple color mixture, and two different colors reflecting the original color before each combination have partial strength. A beautiful mixed gradation is born. Therefore, in the present invention, the color moire pattern (15) and the base image (13) appearing in the printed image (3) always have different hues.

  In the first embodiment, the image change effect has been described as an example in which two latent images are changed. However, the number of latent images is not limited to two. That is, if n latent images are to be provided, a latent image element group (6) including the first latent image element group to the nth latent image element group is formed, and the latent image elements overlap each other. It may be arranged so that there is no.

  The image lines, pixel configurations and effects described in Japanese Patent No. 4682283 and Japanese Patent No. 4660775 can all be applied to the latent image printed material (1) of the present invention. In the latent image printed matter (1) described so far, the latent image element group (6) is obtained from the latent image element (9) by using the latent image element (9) for specific significant information such as the techniques described in Japanese Patent No. 4682283 and Japanese Patent No. 4660775. This is a form that is formed by using a divided image line configuration, and is an aspect in which an image change effect is generated in which the latent image printed matter (1) is changed from significant information that is tilted to different significant information. However, the configuration of the latent image element group (6) of the latent image printed matter (1) of the present invention and the effect produced by the configuration are not limited to this. For example, as described in Japanese Patent No. 4844894 and Japanese Patent No. 5131789, a moving image effect using a “moire enlargement phenomenon” in which moire is enlarged and visually recognized, or described in Japanese Patent No. 5200284. As in the above technique, the moving picture effect of the integral photography method may be applied to the base image (13). These will be specifically described below.

  FIG. 10 shows a special moving image in which an enlarged moire appears as a base image (13A, 13B) using the moire enlargement phenomenon, and the enlarged moire that appears by tilting the latent image print (1) appears to move. This is one form of the latent image element group (6) capable of producing an effect. Since the configuration of the print image (3) other than the latent image element group (6) is exactly the same as the mode in which the image change effect described above occurs, description thereof is omitted.

  The latent image element group (6) using the moire expansion phenomenon is a latent image element obtained by compressing the base image (13A, 13B) in a first direction (S1 direction) orthogonal to the image line direction of the bowl-shaped element (8). (9) has a configuration in which lines (9) are continuously arranged in a line with a pitch (P2, P3) slightly different from the pitch (P1) of the bowl-shaped element group (5). In the example of FIG. 10, the latent image element group (6) includes two element groups, and includes a first latent image element group (6A) and a second latent image element group (6B). The first latent image element group (6A) is a first base image (13A) in which the alphabet “J” is compressed in the first direction (S1 direction) to obtain a line width (W2). The latent image elements (9A) are continuously arranged in the first direction (S1 direction) at a pitch (P2) slightly smaller than the pitch (P1) of the bowl-shaped element group (5). The second latent image element group (6B) compresses the alphabet “P” as the second base image (13B) by mirror-inversion in the first direction (S1 direction) and the image width (W3). The second latent image element (9B) is continuously arranged in the first direction (S1 direction) at a pitch (P3) slightly larger than the pitch (P1) of the bowl-shaped element group (5).

  The effect of the latent image printed material (1) when the latent image element group (6) shown in FIG. 10 is used will be described. The effect under the diffuse reflected light is the same as the example described in the change effect, and as shown in FIG. 11A, the observer's viewpoint (12) is under the diffuse reflected light where no strong reflected light is generated. In this case, the observer can visually recognize only the alphabet “JPN” in the printed image (3). Further, as shown in FIG. 11B and FIG. 11C, when the observer's viewpoint (12) is under specular reflection light that generates strong reflected light, the observer displays an alphabet in the printed image (3). The enlarged moiré with “J” as the base image (13A) and the enlarged moiré with the alphabet “P” as the base image (13B) can be visually recognized. Further, as shown in FIG. 12B and FIG. 12C, when the latent image printed material (1) is tilted or the angle of incident light is changed, each enlarged moire is in the first direction. (S1 direction) or a state of moving in the opposite direction to the first direction (S1 direction) can be visually recognized. Similarly to the example described in the change effect, a color moire pattern (15) having a hue different from that of the base image (13) appears and an effect of appearing to move occurs.

  As described above, in the latent image printed matter (1) of the present invention, the moire enlargement phenomenon completely different from the change effect is completely different from the change effect on the base image (13) only by changing the line composition of the latent image element group (6). The used moving image effect can be produced.

  Note that the principles, effective configurations, conditions, and the like that cause such effects are as described in Japanese Patent No. 4844894 and Japanese Patent No. 5131789, and in Japanese Patent No. 4844894 and Japanese Patent No. 5131789. The described image line, pixel configuration and the like can be applied to the latent image printed material (1) of the present invention.

  Next, FIG. 12 shows that the base image (13) appears as a latent image by configuring the latent image element group (6) using the integral photography method of forming a stereoscopic image, This is one form of a latent image element group (6) capable of producing a moving image effect in which the base image (13) that appears by tilting the latent image print (1) appears to move. Since the configuration of the print image (3) other than the latent image element group (6) is exactly the same as the mode in which the image change effect described above occurs, description thereof is omitted.

  The latent image element group (6) using the integral photography method for forming a stereoscopic image has a base image (13 in the first direction (S1 direction) orthogonal to the image line direction of the saddle-shaped element group (5). ) Are divided and compressed, and a plurality of the latent image elements (9) are continuously arranged at the same pitch (P1) as the pitch (P1) of the bowl-shaped element group (5). In the example of FIG. 12, the latent image element group (6) is composed of a plurality of latent image elements (9) produced from a base image (13) representing cherry blossom petals. The latent image element group (6) divides the base image (13) by a certain width and takes it out, and compresses the taken image in the first direction (S1 direction) to obtain the line width W2. (9) is continuously arranged in a line shape in the first direction (S1 direction) at the same pitch (P1) as the pitch (P1) of the bowl-shaped element group (5). Unlike the example of FIG. 10 using the moiré expansion phenomenon, adjacent latent image elements (9) are compressed by shifting the phase at the time of taking out from the base image (13) by one pitch, so that the shape is slightly Is different.

  The effect of the latent image printed material (1) when the latent image element group (6) shown in FIG. 12 is used is as shown in FIG. As shown in FIG. 13A, when the observer's viewpoint (12) is under diffuse reflected light that does not generate strong reflected light, the observer visually recognizes only the alphabet “JPN” in the printed image (3). it can. In addition, as shown in FIGS. 13B and 13C, when the observer's viewpoint (12) is under specular reflection light in which strong reflected light is generated, the observer is in the printed image (3). The cherry blossom petals that are the image (13) can be visually recognized. Further, as shown in FIG. 13B and FIG. 13C, when the latent image printed material (1) is tilted or the angle of incident light is changed, the base image (13) is in the first direction. (S1 direction) or a movement in the direction opposite to the first direction (S1 direction) can be visually recognized. Similarly to the example described in the change effect, a color moire pattern (15) having a hue different from that of the base image (13) appears and an effect of appearing to move occurs.

  As described above, in the latent image printed material (1) of the present invention, there is provided an integral photography method for forming a three-dimensional image that is completely different from the change effect only by changing the image line configuration of the latent image element group (6). The used moving image effect can be produced. Note that the principle, effective configuration, conditions, and the like that cause such an effect are as described in Japanese Patent No. 5200284, and the image line and pixel configuration described in Japanese Patent No. 5200284 are the latent image of the present invention. The present invention can be applied to the configuration of the printed material (1). Moreover, it can also be set as a curve structure like Unexamined-Japanese-Patent No. 2014-151557 and Unexamined-Japanese-Patent No. 2015-47772.

  As described above, the latent image printed material (1) of the present invention has a change effect with respect to the base image (13) by changing the configuration of the latent image element group (6) superimposed on the bowl-shaped element group (5). It can produce various effects such as video effects.

  In addition, the light reflecting element group (7) described above has a configuration in which significant information is expressed with two gradations, which is configured by two different area ratios, but may display an image as illustrated in FIG. FIG. 14A shows a flat single gradation image without shading, and FIG. 14B and FIG. 14C show images expressing significant information in multiple gradations. It is. In the present invention, the maximum area ratio and the minimum area of the image represented by the light reflecting element group (7) are assured in order to ensure the effect that the significant information represented by the light reflecting element group (7) disappears under regular reflection light. The difference in rate needs to be 70% or less. When this difference exceeds 70%, significant information represented by the light reflecting element group (7) may not be completely lost under specular reflection light.

(Second embodiment)
Next, a second embodiment will be described. In the first embodiment, the latent image element group (6) is transparent, whereas in the second embodiment, the latent image element group (6) has a specific color and light. In this embodiment, the color belongs to the same hue as the reflective element group (7). This form has an adverse effect on the effect of changing the image under specularly reflected light due to the importance of quality control and the large amount of reflected light generated from the bowl-shaped element group (5) and the light reflecting element group (7). It is a form intended to be applied to the case of giving.

  The appearance of the latent image printed matter (1 ′) described in the second embodiment will be described as being the same as that of the first embodiment shown in FIG. The effect of the latent image print (1 ′) of the second embodiment is the same as that of the latent image print (1) of the first embodiment, and many of the configurations are common. The major differences are the color of the latent image element group (6 ′), the color and structure of the light reflection element group (7 ′), and the positional relationship between the latent image element group (6 ′) and the light reflection element group (7 ′). Therefore, it demonstrates centering on them and description is abbreviate | omitted about the same structure as 1st embodiment.

  FIG. 15 shows an outline of the print image (3 ′) of the latent image print (1 ′) in the second embodiment. The printed image (3 ′) has a light reflecting layer (4 ′), a ridge-shaped element group (5 ′) is formed on the light reflecting layer (4 ′), and a latent image element group (6) is further formed thereon. ') And the light reflecting element group (7') are formed to overlap each other. However, in the second embodiment, the layer structure of the latent image element group (6 ′) and the light reflecting element group (7 ′) is in a juxtaposed relationship. Significant information appearing at the time of regular reflection is included in the latent image element group (6 ′). Also in the second embodiment, as in the first embodiment, the latent image element group (6 ′) is a first latent image element group (“A”) representing the alphabet “A”, which is the first significant information. 6A ′) and a second latent image element group (6B ′) representing the alphabet “B” as the second significant information.

  The image line configuration and constituent materials of the bowl-shaped element group (5 ′), optical characteristics under specular reflection light, and the like are the same as those in the first embodiment. However, the bowl-shaped element group (5 ′) of the second embodiment needs to be transparent under diffuse reflection light. Unlike the first embodiment, the reason why the hook-shaped element group (5 ′) needs to be transparent is that the hook-shaped element group (5 ′) is formed on the hook-shaped element group (5 ′) in the second embodiment. This is because the moire pattern is prevented from being visualized even under diffusely reflected light because the light reflecting element group (7 ′) has an arbitrary color other than transparent. Although the same applies to the first embodiment, when the printed image (3 ′) represents significant information under diffuse reflected light (“JPN” in this example), the moire pattern was visualized under diffuse reflected light. In some cases, it overlaps with significant information, which may reduce the visibility of significant information, which is not desirable.

  Next, the latent image element group (6 ′) will be described with reference to FIG. The image line configuration and constituent materials of the latent image element group (6 ′) are the same as those in the first embodiment. However, the latent image element group (6 ′) of the second embodiment has an arbitrary color other than transparent under diffuse reflected light and different from the base material. The reason for this is that having an arbitrary object color is much more advantageous to detect with various optical sensors than being transparent, especially when online inspection during printing must be performed. It is because it is suitable. Moreover, when the amount of reflected light generated from the light reflecting element group (7 ′) or the bowl-shaped element group (5 ′) is too large, the latent image element group (6 ′) made of transparent ink cannot suppress the reflected light, Since there is a possibility of affecting the visibility of the latent image under the specularly reflected light, in this case, it is more desirable to use the present embodiment in which the latent image element group (6 ′) is colored.

  Further, as optical characteristics required for the latent image element group (6 ′), it is desirable that the light reflecting element group (7 ′) and the latent image essential group (6 ′) have greatly different colors during regular reflection. Specifically, the light reflection element group (7 ′) and the latent image element group (6 ′) need to have a color difference ΔE of 10 or more different during regular reflection. When the color difference ΔE is less than 10, the color difference between the light reflecting element group (7 ′) and the latent image element group (6 ′) is small, and the latent image may be unclear. The above is the description of the latent image element group (6 ′).

  Next, the light reflecting element group (7 ′) will be described with reference to FIG. The configuration of the light reflecting element group (7 ′) is greatly different from that of the first embodiment. First, the light reflecting element group (7 ′) needs to have the same hue as the latent image element group (6 ′) under diffuse reflected light, and should not be transparent. Further, in the second embodiment, as in the first embodiment, an information part (7A ′) representing characters of significant information “JPN” that can be visually recognized under diffuse reflected light and its background are formed. In addition to the background portion (7B ′), the latent image element group (6 ′) has the same image line configuration and size as the latent image element group (6 ′), and the density of the printed image (3 ′). The latent image camouflage element group (7C ′) which is a color having a density obtained by subtracting the density of “′) is provided. The latent image camouflage element group (7C ′) is formed by arranging the latent image camouflage elements (14 ′) in a line shape.

  The light reflecting element group (7 ′) has the above-described configuration. As shown in FIG. 17, the latent image element group (6 ′) is printed on the bowl-shaped element group (5 ′), and the light reflecting element group ( 7 ′) or the latent image element group (6 ′) and the light reflecting element group (7 ′) may be printed in any printing order. In addition, if the latent image camouflage element group (7C ′) has a white configuration (area ratio 0%), the latent image element group (6 ′) and the light reflection element group (7 ′) are in a side-by-side relationship. However, in other cases, the latent image camouflage element group (7C ′) and the latent image element group (6 ′) are in a superimposed relationship. In any case, the latent image camouflage element (14 ′) has a structure in which the latent image elements (9 ′) having the same shape and the same size are fitted to each other at the position of the latent image camouflage element (14 ′). When the latent image camouflage element group (7C ′) and the latent image element group (6 ′) are fitted together, the latent image element group (6 ′) is hidden in the printed image (3 ′). The latent image element group (6 ′) becomes invisible.

  Here, the relationship between colors in the printed image (3 ′), the light reflecting element group (7 ′), and the latent image element group (6 ′) to be invisible under diffuse reflected light will be described. Since the light reflecting element group (7 ′) and the latent image element group (6 ′) belong to the same hue under diffuse reflected light, the printed image can be obtained by adjusting only the shade (lightness) of the two images. The latent image element group (6 ′) can be concealed in (3 ′), and can be made invisible under diffuse reflection.

  As a basic color design order, first, the color of the print image (3 ′) is determined. Thereby, the hues to which the light reflecting element group (7 ′) and the latent image element group (6 ′) belong are automatically determined, subsequently the color density of the latent image element group (6 ′) is determined, and finally the light reflection is performed. The color density of each part of the element group (7 ′) is determined.

  The color design procedure will be specifically described below. The reflection density described below is expressed as the density under diffuse reflected light. First, it is assumed that the print image (3 ′) is expressed in red, and the dark portion representing “JPN” is designed to have a red reflection density of 1.0, and the light portion represents a red reflection density of 0.6. To do. In this case, the latent image element group (6 ′) and the light reflecting element group (7 ′) are expressed by a red hue. Here, it is assumed that the latent image element group (6 ′) is designed to have a red reflection density of 0.4. When these conditions are determined, the reflection density of all regions of the light reflecting element group (7 ′) can be determined. The reflection density of the light reflection element group (7 ′) is calculated by subtracting the reflection density of the latent image element group (6 ′) existing at the same position from the reflection density of the printed image (3 ′).

  First, in the information part (7A) of the light reflection element group (7 ′), the reflection density of the area where the latent image element group (6 ′) does not overlap is the same as the reflection density of the dark part of the printed image (3 ′). The reflection density of the region where the latent image element group (6 ′) overlaps is 1.0 to the reflection density of the latent image element group (6 ′) from the reflection density of 1.0 in the dark part of the printed image (3 ′). It is 0.6 after subtracting 4. In addition, the reflection density of the area where the latent image element group (6 ′) does not overlap in the background portion (7B) is 0.6, which is the same as the reflection density of the light part of the printed image (3 ′). The reflection density of the region where (6 ′) overlaps is 0.2, which is obtained by subtracting the reflection density 0.4 of the latent image element group (6 ′) from the reflection density 0.6 of the light portion of the printed image (3 ′). . All reflection densities belong to a red hue. As described above, by designing the color of the printed image (3 ′) and the color of the latent image element group (6 ′), the color of the light reflecting element group (7 ′) is automatically determined.

  If the reflection density can be formed as designed, the latent image element group (6 ′) and the light reflection element group (7 ′) do not need to use the same color ink of the same color. For example, dark red ink may be used for the latent image element group (6 ′), and light red ink may be used for the light reflecting element group (7 ′). As a matter of course, a light red ink may be used for the latent image element group (6 ′), and a dark red ink may be used for the light reflecting element group (7 ′). If the hue is the same, it is possible to make the inks of different densities have the same color on the design by controlling the dot area ratio and the printed film thickness.

   It is not necessary to form the latent image element group (6 ′) and the light reflecting element group (7 ′) with the same color inks in the same latent image printed matter (using a printing machine with a limited number of units). 1 ') is an advantage in color design. For example, assume that the color of the print image (3 ′) is an achromatic gray. In this case, it is appropriate to use silver ink, which is a metallic ink, for the light reflecting element group (7 ′), but one latent image element group (6 ′) does not use the same color gray ink. Usually, it can be formed by diverting the black ink used for the text portion of the printed matter (representing gray by lowering the black dot area ratio). In this way, by using inks of different colors, it is possible to open one printing unit as compared with the anti-counterfeiting technology formed using the same color pair ink. In the printing unit, the printed image (3 ′) itself and its periphery can be colored with vivid colors using inks of different colors, and as a result, the color design of the entire latent image printed matter (1 ′) is improved. .

  In addition, the light reflecting element group (7 ′) must have at least one optical characteristic of light / dark flip-flop or color flip-flop, and in addition, the color of the light reflecting element group (7 ′) during regular reflection is As in the first embodiment, the light reflection layer (4) needs to have different colors and hues during regular reflection.

  FIG. 18 shows a cross-sectional structure when one element of the print image (3 ′) of the second embodiment is enlarged. The light reflecting element group (7 ′) and the latent image elements (9A ′, 9B ′) are fitted and overlapped on the bowl-shaped element (8 ′). Also in this form, as in the form of FIG. 5B, the rough three-dimensional structure such as the height and width of the ridge-like element (8 ') as a base is reflected as it is, while the ridge-like element (8' Slight irregularities on the surface of the image line of ′) are filled flat by the film thickness of the light reflecting element group (7 ′), become smoother than the surface of the original bowl-shaped element (8 ′), and the latent image element (9A) The amount of reflected light also increases in the region where ', 9B') does not exist. The area where the latent image element (9A ′, 9B ′) overlaps with the saddle-like element (8 ′) blocks the incident light reaching the saddle-like element (8 ′) below the saddle-like element (8 ′). The amount of reflected light resulting from ′) is significantly reduced. In the case of the two structures shown in FIGS. 5A and 5B in the first embodiment, the light reflecting element group (7 ′) is formed on the upper layer or the lower layer of the latent image elements (9A ′, 9B ′). However, in this embodiment, the light-reflecting element group (7 ′) does not exist in a region where the latent image elements (9A ′, 9B ′) are directly overlapped on the bowl-shaped element (8 ′). For this reason, in the second embodiment, since there is no light reflecting element group (7 ′) in a region where the latent image elements (9A ′, 9B ′) exist, the latent image elements (9A ′, 9B ′). ), The amount of reflected light generated during regular reflection can be further reduced. For this reason, the difference in the amount of reflected light between the region where the light reflecting element group (7 ′) is present and the region where the latent image elements (9A ′, 9B ′) are present becomes larger, and the visibility of the latent image can be further increased. .

  The effect of the latent image printed matter (1 ′) of the present invention is as shown in FIG. The effect is the same as the effect shown in the first embodiment. First, when the latent image printed matter (1 ′) is observed under diffuse reflected light, only the alphabet “JPN” is visually recognized in the first embodiment (not shown). Under diffuse reflection, the base image (13) and the moire pattern do not appear and are completely invisible.

  Next, the effect under regular reflection light will be described. Under regular reflection light, the alphabet “JPN” visually recognized under diffuse reflection light disappears visually. This is because the light reflection element group (7 ′) is regularly reflected, the density of the entire image becomes light (the brightness increases), and the density difference between the characters “JPN” and the surrounding area (lightness difference) is compressed. This is because it becomes smaller and cannot be visually observed.

  Further, as shown in FIG. 19A, when light is incident on the latent image printed matter (1 ′) from the light source (11 ′) on the left side, the alphabet of the first significant information is displayed to the observer (12 ′). A color moire pattern (15) having a color different from “A” and “A” is visually recognized. On the other hand, as shown in FIG. 19B, when light is incident on the latent image printed material (1 ′) from the right side, the alphabet (B), which is the second significant information, and “ A color moire pattern (15) having a color different from “B” is visually recognized. Further, the color moire pattern (15) appearing in the background appears to move continuously left and right by changing the inclination of the latent image print (1 ′) as shown in FIG. Actually, the effect that the significant information visually recognized in the printed image (3 ′) changes according to the change in the angle of the incident light and the effect that the color moire pattern (15) appears to move simultaneously appear. Further, since the significant information to be changed and the color of the color moire pattern (15) are different, the respective visibility is not impaired. Since these principles are the same as those in the first embodiment, description thereof will be omitted.

  In the second embodiment, only the latent image printed matter (1 ′) in which the base image (13) is changed has been described. However, a form in which the base image (13) using the moire enlargement phenomenon appears, an Integra The form in which the base image (13) of the photophotography system appears can be used in the same manner as in the first embodiment. The above is the description of the second embodiment.

  In the present invention, the color moire pattern (15) generated in the background separately from the base image (13) may affect the movement, change effect, etc. of the base image (13) in some cases. This is because, depending on the layer structure of the latent image printed matter (1), the latent image element group (6) not only overlaps the bowl-shaped element group (5) but also overlaps the light reflecting element group (7). For this reason, it is caused by sampling separately into two element groups having different optical characteristics. If the difference in optical characteristics between the saddle-shaped element group (5) and the light reflecting element group (7) is too large, for example, the timing at which the base image (13) changes for each region having a different moiré pattern color, In some cases, the speed and size of the movement of the base image (13) change, the shape is distorted, or is unclearly observed. In such a case, the area ratio of the light reflecting element group (7) is adjusted so as to reduce the difference in optical characteristics, or the light reflecting element group (6) is overlaid. From the configuration in which only the element group (7) is arranged in a line with a pitch close to that of the saddle-like element group (5), the pitch and the configuration are greatly different from those of the saddle-like element group (5) (fine halftone dots are random A structure in which the optical characteristics of the area where the latent image element group (6) is present are not changed uniformly by changing to a configuration in which interference with the saddle-shaped element group (5) does not easily occur. This can be solved by adopting a configuration in which no moire pattern is generated only in the region.

  Functionality may be imparted to the ink used for the saddle-like element group (5), the light reflecting element group (7), and the latent image element group (6). For example, it may be formed with infrared absorbing ink, infrared transmitting ink, infrared reflecting ink, or the like, and a luminescent pigment may be blended.

  The height of the swell of the scissors-like element (8) is not particularly limited, but it is not desirable to have a height exceeding 1 mm in consideration of flowability. Further, when the ridge-like element (8) is formed of ink, and the thickness of the film is less than 2 μm, the image changing effect may be lowered. Therefore, when the ridge-like element (8) is formed by an ink film, it is desirable that it is 2 μm or more and 1 mm or less. The height of the bowl-shaped element (8) most suitable for exploiting the features of the present invention is 5 μm or more and 30 μm or less.

  The pitch (P1, P2) of each of the latent image element group (6), the bowl-shaped element group (5), and the light reflecting element group (7) is preferably 0.01 mm or more and 5.0 mm or less. When a pitch of 2 μm or more is formed on the bowl-shaped element (8) with a pitch of less than 0.01 mm, the pitch of the bowl-shaped element (8) that can be reproduced by general printing is almost the limit pitch. In addition, the stability of the printed matter is lacking, and even if the element can be formed with a pitch of less than 0.01 mm, in most cases, the visibility of the appearing latent image becomes extremely low, which is not appropriate. On the other hand, if the pitch is more than 5.0 mm, the resolution of the image that can be reproduced as a latent image is extremely low, which is not appropriate.

  When the latent image element group (6) is formed by printing like the latent image printed matter (1) of the present embodiment, an offset printing method or a flexographic printing method capable of relatively high resolution printing is suitable. In addition, it can be formed using a digital printing machine such as an ink jet printer or a laser printer. When these digital printing machines are used, there is a feature that variable information that gives different information one by one can be easily given. Further, if the layer structure in which the light reflecting element group (7) and the latent image element group (6) are overlapped as described in the first embodiment, the saddle-shaped element group (5) or It is also possible to form the latent image element group by slightly cutting the image surface of the light reflecting element group (7) and changing the optical characteristics.

  In the present invention, “regular reflection” refers to a phenomenon in which, when light is incident on a substance at an incident angle, strong reflected light is generated at an angle substantially equal to the angle of the incident light. This refers to a phenomenon in which when light is incident on a substance at an incident angle, weak reflected light is generated at an angle different from the angle of the incident light. For example, when an iris pearl ink is taken as an example, it appears colorless and transparent in the diffuse reflection state, but emits light with a specific interference color in the regular reflection state. In addition, “observation under specular reflection light” refers to a state of observation from a viewpoint at a reflection angle substantially equal to the angle of light incident on the print, and “observation under diffuse reflection light” This refers to the state of observation at an angle that is significantly different from the angle of the light incident on.

  In addition, the “image line” in the present invention is a dotted line or a broken line, a straight line, a curve, Pointed to a broken line, etc., `` pixel '' means at least one printing halftone dot or a plurality of printing halftone dots, a circle, a triangle, a polygon including a quadrangle, various figures such as a star, a character or a symbol, Point to numbers.

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

  Hereinafter, examples of the latent image printed matter (1) specifically produced according to the embodiment for carrying out the present invention will be described in detail, but the present invention is not limited to these examples.

  Examples will be described in the example of the latent image printed matter (1) described in the first embodiment. Specifically, description will be made with reference to FIGS. 1 to 8 as in the embodiment. FIG. 1 shows a latent image print (1) of the example. The latent image printed matter (1) has a gray printed image (3) on the substrate (2). For the base material (2), general coated paper (Esprit Coat FM manufactured by Nippon Paper Industries Co., Ltd.) was used.

  FIG. 2 shows an outline of the print image (3). The printed image (3) has a light reflecting layer (4), on which a bowl-shaped element group (5) overlaps, and further, a latent image element group (6) and a light reflecting element group (7). Are overlapped. The laminated form was the form shown in FIG. The latent image element group (6) includes a first latent image element group (6A) constituting the alphabet "A" and a second latent image element group (6B) constituting the alphabet "B". .

  The light reflection layer (4) was UV-dried screen printing, and was printed on the substrate (2) using a transparent pearl ink shown in Table 1 with a solid dot area ratio of 100%. The wrinkle-like element (8) printed with this ink was transparent under diffuse reflected light, and produced a color flip-flop property that emits a gold interference color under regular reflected light. FIG. 3 shows a saddle-like element group (5) formed on the substrate (2). In the saddle-like element group (5), saddle-like elements (8) forming a straight line having a width of 0.3 mm are continuously arranged at a pitch of 0.4 mm in a first direction (S1 direction) orthogonal to the linear direction. Become. The screen-like element group (5) having such an image line configuration is printed on the substrate (2) by using a UV drying screen printing and using a transparent ink (medium for screen TUB-000 manufactured by Teikoku Ink Manufacturing Co., Ltd.). did. The ink is transparent under diffuse reflection. The height of each bowl-shaped element (8) was about 15 μm.

  The latent image element group (6) will be described with reference to FIG. The latent image element group (6) includes two pieces of significant information, that is, the first significant information, the alphabet “A”, and the second significant information, the alphabet “B”. The first significant information is represented by a first latent image element group (6A) shown in FIG. 4B, and the second significant information is a second latent image element group (6B) shown in FIG. 4C. ). In the first latent image element group (6A), first latent image elements (9A) having an image line width of 0.15 mm are continuously arranged in a first direction (S1 direction) at a pitch of 0.4 mm. In the second latent image element group (6B), second latent image elements (9B) having an image line width of 0.15 mm were continuously arranged in the first direction (S1 direction) at a pitch of 0.4 mm. The first latent image element (9A) and the second latent image element (9B) were shifted by 0.2 mm corresponding to half the pitch in the first direction (S1 direction). The latent image element group (6) having the above-described configuration was formed on the saddle-shaped image line group (4) by wet offset printing with a low gloss and transparent ink (made by Matte Medium T & K TOKA).

  In the light reflecting element group (7) shown in FIG. 2, the information part (6A) representing the alphabet “JPN” has an area ratio of about 60%, and the other background part (7B) has an area ratio of about 30%. Specifically, the information section (6A) includes a plurality of light reflecting elements (10) having an image line width of 0.25 mm arranged in the first direction (S1 direction) at a pitch (P2) of 0.412 mm, and a background portion. In (7B), a plurality of light reflecting elements (10) having an image line width of 0.12 mm are arranged in the first direction (S1 direction) with a pitch (P2) of 0.412 mm. The light reflecting element group (7) was printed on the saddle-like element group (5) and the latent image element group (6) using silver ink (manufactured by TKSO Silver T & K TOKA) by wet offset printing. This light-reflecting element group (7) has an excellent light-dark flip-flop property that is dark gray under diffuse reflection light and white under regular reflection light. The printed film of the light reflecting element group (7) was about 1 μm.

  The effect of the latent image printed matter (1) of the embodiment will be described with reference to FIG. When the latent image print (1) was observed under diffuse reflection, the letters “JPN” were visually recognized in the printed image (3) with a light and shade of silver. Next, as shown in FIG. 8A, when light is incident on the latent image printed material (1) from the left side, the characters “JPN” disappear and the observer (12) has two bright white and gold colors. In the color moire pattern (15) representing a colorful gradation having two hues, the alphabet “A” as the first significant information was visually recognized in a dark gray color. Further, as shown in FIG. 8B, when light is incident on the latent image printed material (1) from the right side, the observer (12) has a color with a rich gradation having two hues of bright white and gold. In the moire pattern (15), the alphabet “B” as the second significant information was visually recognized in a dark gray color. Further, the color moire pattern (15) was confirmed to have an effect of continuously moving in the first direction as shown in FIG. 9 by slightly changing the inclination. As described above, the base image (13) visually recognized in the printed image (3) is changed in accordance with the change in the angle of incident light, and at the same time, the colorful color moire pattern (15) appears to move. It was confirmed that the The base image (13) and the color moire pattern (15) have different hues, and their visibility was not impaired.

1, 1 'latent image print 2, 2' substrate 3, 3 'printed image 4, 4' light reflecting layer 5, 5 'bowl-shaped element group 6, 6' latent image element group 6A, 6A 'first latent Image element group 6B, 6B ′ Second latent image element group 7, 7 ′ Light reflecting element group 7A, 7A ′ Information section 7B, 7B ′ Background section 7C ′ Latent image camouflage element group 8, 8 ′ bowl-shaped element 9 latent Image element 9A, 9A 'First latent image element 9B, 9B' Second latent image element 10, 10 'Light reflecting element 11, 11' Light source 12, 12 'Observer's viewpoint 13 Base image 13A First base Image 13B Second base image 14 'Latent image camouflage element 15 Color moire pattern

Claims (4)

At least part of the substrate is transparent or colored having a ridge shape formed of a resin-containing material on a light reflecting layer having at least one optical property of light / dark flip-flop or color flip-flop A group of bowl-shaped elements in which bowl-shaped elements are arranged in a line,
Light reflecting elements having a different hue from the light reflecting layer under regular reflection light and having at least one optical property of light / dark flip-flop property or color flip-flop property are arranged in a line on the saddle-like element group. And the latent image element group in which transparent latent image elements obtained by dividing and / or compressing the base image are arranged in a line are sequentially laminated,
The saddle-like element group and the light reflecting element group are arranged such that at least one of the element pitch, arrangement angle, and shape is different from each other so that the element groups interfere with each other, and the light reflecting layer is under specular reflection light. Since the hue of the light reflecting element group is different, a color moire pattern having a plurality of hues is formed,
When the substrate is observed under regular reflection light while continuously changing the observation angle, the latent image is changed and / or dynamically visually recognized and the color moire pattern is dynamically visually recognized. Characteristic latent image printed matter. At least one of the bowl-shaped element group or the light reflecting element group is transparent,
The light reflecting element group is formed by forming a visible image with a density difference due to a difference in area ratio,
When the substrate is observed under diffuse reflected light, only the visible image is visible, and when observed under regular reflected light, the color moire pattern appears, and the visible image disappears and is not visually recognized. Item 2. The latent image printed matter according to item 1. A transparent bowl-like shape having a bowl shape formed of a resin-containing material on a light reflection layer having at least one optical property of light / dark flip-flop or color flip-flop on at least a part of the substrate A saddle-shaped element group in which elements are arranged in a line is laminated,
On the saddle-like element group, the hue is different from that of the light reflection layer under specular reflection light, and has at least one of light-dark flip-flop property or color flip-flop property, and the base under diffuse reflection light. A light reflecting element group in which light reflecting elements having a color different from that of the material are arranged in a line;
Latent image elements having the same hue as the light reflecting element group under diffusely reflected light, and latent image elements obtained by dividing and / or compressing the base image in a line shape are sequentially stacked or juxtaposed. A print image consisting of
The light reflecting element group is configured with a density obtained by subtracting the density of the latent image line group from the density of the printed image under diffuse reflected light,
The saddle-like element group and the light reflecting element group are arranged such that at least one of the element pitch, arrangement angle, and shape is different from each other so that the element groups interfere with each other, and the light reflecting layer is under specular reflection light. Since the hue of the light reflecting element group is different, a color moire pattern having a plurality of hues is formed,
When the substrate is observed under regular reflection light while continuously changing the observation angle, the latent image is changed and / or dynamically visually recognized and the color moire pattern is dynamically visually recognized. Characteristic latent image printed matter. At least one of the bowl-shaped element group or the light reflecting element group is transparent,
The light reflecting element group is formed by forming a visible image with a density difference due to a difference in area ratio,
When the substrate is observed under diffuse reflected light, only the visible image is visible, and when observed under regular reflected light, the color moire pattern appears, and the visible image disappears and is not visually recognized. Item 3. The latent image printed matter according to Item 2.

Images