JP2020114639A - Forgery preventive printed matter - Google Patents

Abstract

To provide a forgery preventive printed matter having an effect such that an image is changed from an observation angle which can impart a rich hue by a plurality of different hues containing different hues using a normal coloring ink without using a special functional pigment.SOLUTION: A printing image that is provided on at least a part of a base material and has a hue different from the base material has: a hue image by a hue composed of two or more different color tones containing at least one chromatic color; a brilliant image which has any one optical characteristic of light-dark flip flop property and color flip flop property and has an object color different from the base material, and expresses concentration difference with a predetermined area ratio; and a latent image formed with a transparent or semi-transparent latent element having any one optical characteristic of light-dark flip flop property and color flip flop property with a predetermined area ratio or more.SELECTED DRAWING: Figure 2

Description

INDUSTRIAL APPLICABILITY In the field of security printed matter such as banknotes, passports, securities, identification cards, cards and pass tickets that require anti-counterfeiting effects, observable images are displayed on different images depending on the incident light angle. The present invention relates to an anti-counterfeit printed material that is rich in color expression and that changes.

With the recent development of digital devices such as scanners, printers, and color copiers, it has become possible to easily produce delicate copies of valuable printed matter. As one of the anti-counterfeiting technologies for preventing such duplication and forgery, there are many ones that have optical security elements such as holograms attached, which change the image by changing the observation angle of the valuable printed matter. became.

However, unlike conventional anti-counterfeiting technology, in which holograms are formed by printing with ink, holograms are formed using a complicated manufacturing process and special materials, so it is more difficult to manufacture than conventional printed products for anti-counterfeiting. It is expensive and extremely expensive. Therefore, special light-reflecting powders such as metallic ink, interference mica, oxidized flake mica, pigment-coated aluminum flake, and optical change flake are compounded in ink and paint, and special materials are superposed on each other. A forgery-preventing printed matter has been developed that can be formed by a general printing method and realizes an image change similar to that of a hologram by using a complicated halftone dot structure.

Applicants have found that, while using common and relatively inexpensive materials and simple printing means, at a particular viewing angle, the information perceived by the human eye at a particular site in the print is the viewing angle. Has already applied for an invention relating to an anti-counterfeiting information carrier that changes into completely different information by changing the above (see, for example, Patent Documents 1 to 5).

Japanese Patent No. 3398758 Japanese Patent No. 4604209 Japanese Patent No. 3718712 Japanese Patent No. 5142156 Patent No. 5294199

Regarding the technique of Patent Document 1, since the glittering material forming the first print image and the color material forming the second print image have different hues, the second print image is observed in the observation under the diffuse reflection light. In order to conceal, it was necessary to accurately match the first print image and the second print image with each other in a predetermined positional relationship when superimposing them. Further, since the color material forming the second print image is composed of one type of ink, there is a problem that the color of the second print image is limited to a single color. In addition, since the second print image is composed of a sparse area ratio, there is a problem that the visibility of the second print image that appears under specular reflection light is low.

The technique described in Patent Document 2 is a technique in which the area ratio of the second print image is increased and the visibility of the image is improved. However, unlike the technique of Patent Document 1 that realizes an image change effect accompanied by a hue change, since it is a technique that mainly realizes an image change effect by utilizing the increase in brightness of the glitter material, it appears as a change. However, there is a problem in that the image to be displayed is limited to a monotone monotone image expressed only by the shade of a single hue.

The techniques described in Patent Document 3 and Patent Document 4 are techniques in which a latent image appears and the image changes by exhibiting a color that is colored in a specific hue under specular reflection light. However, the color that appears under the specular reflection light is derived from the optical characteristics of the functional pigment contained in the ink, and in order to enhance the effect, the functional pigment is oriented on the surface of the image line having a swell. Therefore, a special water- and oil-repellent treatment (perfluoroalkylphosphoric acid treatment) is required for the pigment, which is time-consuming and costly. There was a problem with the robustness that it could easily fall off the wire.

The technique described in Patent Document 5 is a technique that combines the advantages of the technique of Patent Document 2 and the technique of Patent Document 3, but in order to enhance the color expression, the technique described in Patent Documents 3 and 4 is used. Similarly to the above, there is a problem that a special water and oil repellent treatment is required for the functional pigment, and there is a problem that an appearing image is a monotone as in the technique described in Patent Document 2. ..

The present invention is intended to solve the above-mentioned problems, and is a printed matter having an effect of changing an image under diffuse reflected light and specular reflected light, and an image and specular reflection visible under the diffuse reflected light. It is possible to give rich colors to a plurality of images that can be visually recognized under light by using a normal coloring ink and by using a plurality of different colors including different hues without using a special functional pigment. In addition, a forgery-preventing printed material is provided, which does not require high printing precision in superimposing the first image and the second image and has high visibility of the second image appearing under specular reflection light. To do.

The present invention includes a print image having a color different from that of the base material on at least a part of the base material, and the print image is a color image composed of two or more colors having different hues including at least one chromatic color. , A bright and dark flip-flop property or a color flip-flop property, and an object color different from that of the base material, and a brilliance exhibiting light and shade formed in a predetermined area ratio range. A latent image is formed by laminating an image and a latent image image in which a transparent or semitransparent latent image element having at least one of light and dark flip-flop properties or color flip-flop properties is formed at a predetermined area ratio. The image and the glitter image have a color sharing property with the color image, the latent image is located closer to the substrate than the glitter image, and i) is formed by the difference in the area ratio of the latent image elements, Or ii) It is formed by the difference in the arrangement direction of the latent image elements with ridges that are regularly formed in a line at a predetermined pitch, and when the printed image is observed under the diffuse reflection light, it becomes a glitter image. The first color image is visually recognized by combining and visualizing the color images, and when the printed image is observed under the specular light, the glitter image disappears and the latent image and the color image are combined and visualized. The anti-counterfeit printed matter is characterized in that the second color image is visually recognized.

Further, the color image of the present invention is an anti-counterfeit printed matter characterized by containing at least one chromatic color having a saturation C ^* of 3 or more.

Further, the present invention is an anti-counterfeit printed matter, wherein the latent image is formed with an area ratio of 15% or more.

The anti-counterfeit printed matter of the present invention is different from the techniques described in Patent Documents 1 to 5 in that the second color image appearing under specular reflection light can be composed of two or more different hues. Similarly, since the first color image that can be visually recognized under the diffuse reflection light can also be composed of two or more kinds of hues having different hues, the forgery prevention technique of the present invention has no technical limitation on the number of colors. Further, since the glittering image having the color flip-flop property or the bright/dark flip-flop property and the latent image are superposed, the visibility of the second color image appearing under the specular reflection light is from Patent Document 1 to Patent Document 1. High compared to the technology up to 5.

Unlike the technique of Patent Document 1, the anti-counterfeit printed matter of the present invention does not need to be precisely aligned with a predetermined positional relationship in superimposing a glitter image, a latent image, and a color image, and thus has low manufacturing difficulty.

Further, unlike the techniques of Patent Document 3 to Patent Document 5, the color of the second color image appearing under specular reflection light uses an ordinary coloring ink, so that the color expression depends on a special functional pigment. In addition, similarly, no special water and oil repellent treatment is required.

The anti-counterfeit printed matter formed by the above method is excellent in cost performance because it does not require a special functional material, and it is impossible to realize the switch effect even with the latest digital equipment. Excellent anti-counterfeiting effect.

The anti-counterfeit printed matter in this invention is shown. The outline of the structure of the anti-counterfeit printed matter in the present invention is shown. An example of the structure of the latent image in the present invention is shown. 3 shows a color image in the present invention. The color sharing property in the present invention is shown. The layer structure of the anti-counterfeit printed matter in this invention is shown. The effect of the anti-counterfeit printed matter in the present invention is shown.

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

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

First, the present invention will be described with reference to the drawings. FIG. 1 shows an anti-counterfeit printed matter (1) according to the present invention. The anti-counterfeit printed matter (1) has a printed image (3) of a color different from that of the base material (2) on the base material (2). The printed image (3) represents the first color image under diffuse reflected light. There is no restriction on the size or shape of the print image (3).

The substrate (2) used in the anti-counterfeit printed matter (1) of the present invention may be made of any material, provided that it has the property of accepting inks, paints, coloring materials and the like such as paper, plastic and metal. In order to enhance the effect, the surface of the substrate (2) to be printed is preferably smooth.

The print image (3) is formed by superimposing three different images of the glitter image (4), the latent image (5) and the color image (6) shown in FIG. The specific stacking relationship will be described later.

The glitter image (4) has at least one of a light and dark flip-flop property and a color flip-flop property. The first color image is represented by combining the shade of the single color represented by the glitter image (4) and the color of the color image (6) under the diffuse reflection light. The latent image (5) is transparent or semi-transparent because it has no object color, and is invisible under diffuse reflected light, but visualized under specular reflected light. Under regular reflection light, the shade of the single color represented by the latent image (5) and the color of the color image (6) are combined to represent the second color image. The color image (6) is composed of two or more colors having different hues, and represents the color of the first color image appearing in the print image (3) under the diffuse reflection light, and under the regular reflection light. The color of the second color image appearing in the print image (3) is represented.

As described above, in the present invention, the image appearing in the printed image (3) under the diffuse reflection light is the first color image, and the shade of the glitter image (4) and the color of the color image (6) are It has a combined configuration. Further, the image appearing in the print image (3) under the specular reflection light is defined as a second color image, and the shade of the latent image (5) and the color of the color image (6) are combined.

First, the glitter image (4) will be specifically described. The glitter image (4) has an object color, has at least one of the light and dark flip-flop properties or the color flip-flop properties, and is formed in a certain area ratio range as shown in FIG. The light and shade of the first color image is displayed under the diffuse reflection light. On the other hand, under regular reflection light, the reflection of light causes the light and shade to disappear and visually disappear. As shown in FIG. 1, the first color image in the present embodiment is an image showing two cherry blossom branches in which several flowers have bloomed. The petals of the cherry blossom branches on the upper left are pink and the cherry blossoms on the lower right are The petals of the branches are white, and the leaves of the two cherry tree branches are green. Among them, the glitter image (4) represents only the shade in the first color image. In other words, the glitter image (4) is a monochrome image of the first color image.

As described above, the glitter image (4) needs to have at least either one of the light and dark flip-flop characteristics and the color flip-flop characteristics. The light-dark flip-flop property is a property that the lightness of an object (image) rises when light is reflected, while the color flip-flop property changes the hue of a substance when light is incident on the substance. Refers to the nature.

As a method of imparting a bright/dark flip-flop property or a color flip-flop property to the glitter image (4), a glitter image (4) can be obtained by using an ink, a toner, a coloring material, a paint or the like having the light-dark flip-flop property or the color flip-flop property. Is the easiest to form. Examples of inks used in printing having a light-dark flip-flop property include metallic metallic inks such as gold and silver, and gloss-type colored inks. Materials that are generally perceived as glossy have light and dark flip-flop properties. For example, silver ink appears only dark gray under diffusely reflected light that does not strongly reflect light, but appears lighter gray or white under specularly reflected light that strongly reflects light. As described above, the brightness of the ink having the light-dark flip-flop property changes under the specular reflection light. The pigment in the ink may have the property of strongly reflecting the light, or the resin itself of the ink may have the property of strongly reflecting the light, as long as the lightness changes under the regular reflection light.

On the other hand, inks used for printing having a color flip-flop property include pearl ink, liquid crystal ink, OVI (Optical Variable Ink), CSI (Color Shifting Ink), and the like. Many inks have an object color, while iris-colored pearl inks are colorless and transparent. For example, a red iris pearl ink is colorless and transparent under diffuse reflected light, but emits a red interference color under specular reflected light. As described above, the hue of the ink having the color flip-flop property changes under the specular reflection light.

In order to make the glittering image (4) having light and shade disappear under the regular reflection light, it is necessary to form the glittering image (4) within a certain area ratio range. The range of the area ratio differs depending on the forming method of the glitter image (4), the formed material, and the like. For example, when the glitter image (4) is formed by using a printing ink by a general printing method, the difference between the maximum area ratio and the minimum area ratio is limited to 50% or less to form the glitter image (4). There is a need to. As a result, when the glittering image (4) is specularly reflected, the glittering image (4) strongly reflects light, so that the brightness of the image is increased, and the shade in the image is not perceived by the naked eye, and it is as if the glittering The effect as if the sex image (4) disappeared can be obtained. If the difference between the maximum area ratio and the minimum area ratio is too small, it is difficult to capture the light and shade of the glitter image (4) under the diffuse reflection light. Therefore, the difference between the maximum area ratio and the minimum area ratio needs to be at least 10% or more. is there. On the other hand, if the difference between the maximum area ratio and the minimum area ratio is too large, the shading of the glitter image (4) will not be completely disappeared under specular reflection light, so it is necessary to keep it at 50% or less. As described above, when the glitter image (4) is formed by using the general printing ink, the difference between the maximum area ratio and the minimum area ratio needs to be 10% or more and 50% or less.

In general, the higher the area ratio of an image, the higher the effect of strongly reflecting light. Therefore, in the glitter image (4), it is better to configure the image from the halftone to the shadow under the specular reflection light than the highlight to the halftone. The effect of eliminating the shade of the glitter image (4) is enhanced. If the area ratio of the glitter image (4) is too high, the shade of the glitter image (4) hides the color of the color image (6), and the saturation of the image, which is one of the features of the present invention, becomes low. Will end up. In the case of an ink that strongly reflects light or a printing method such as flexographic printing, gravure printing, or screen printing, in which gloss can be easily obtained, the reflected light in the area in the range of 100% to 90% is less than that. There is a tendency that the light intensity becomes significantly stronger than the reflected light in the halftone dot area ratio, and the brightness becomes too high, and conversely it may become white. Therefore, it is desirable to suppress the maximum area ratio of the glitter image (4) to 90% or less.

It should be noted that one of the color configuration conditions that the glitter image (4) should satisfy is "color sharing" with the color image (6), which will be described in detail in the description of the color image (6). It is described in detail.

Next, the latent image (5) will be specifically described. The latent image (5) is transparent or semi-transparent, and the shade of the second color image is represented by the difference in the drawing direction and the difference in area ratio. The second color image in the present embodiment is an image showing two petals of cherry blossoms, as shown in FIG. 7B. The petals of the cherry blossoms at the upper left are pink, the petals of the cherry blossoms at the lower right are white, and The center petals of the two flowers are yellow and the leaves are green. Among them, the latent image (5) represents only the shade in the second color image by the difference in the drawing direction of the transparent material and the difference in the area ratio. The latent image (5) is a monochrome image of the second color image.

Like the glitter image (4), the latent image (5) needs to have at least one of the light and dark flip-flop characteristics and the color flip-flop characteristics. Further, unlike the glitter image (4), it needs to be transparent or translucent. In addition, in this specification, semitransparent refers to a structure having a light-transmitting property such that the base is not completely hidden.

The latent image (5) can be constructed in various forms. FIG. 3A shows the latent image (5) as a set of ridged lines (hereinafter referred to as raised lines), and has a configuration in which cherry blossom petals are represented by differences in line angles. Due to the difference in the line angle of the raised image line having a ridge, the image is divided into a raised image line that strongly reflects light and a raised image line that weakly reflects light depending on the direction of incident light, resulting in a latent image (5 ) Is visualized by the intensity of light. The basic structure of this streak structure and the principle of visualization are as described in Japanese Patent No. 3718712. Further, as in Japanese Patent No. 4395586, the drawing line angle of the raised drawing line may be subtly changed to add a subtle shading or a moving image effect of light.

Further, FIG. 3B shows a configuration in which the latent image (5) is represented by the difference in area ratio. The area ratio of petals is 100%, and the circumference is 50%. In this way, the latent image (5) may be visualized by making reflected light stronger or weaker by changing the area ratio. When the latent image (5) is formed with a different area ratio, it is possible to form the latent image (5) with a flat image line, without the need for a raised height like a raised image line. Alternatively, the entire latent image (5) may be formed with a constant area ratio, and the contour portion of the latent image may be represented by a blank. Specifically, the entire latent image (5) is set to be 100% solid, and the boundary between the petal, the leaf, and the background is represented by a 0% contour line. Further, as shown in FIG. 3C, a latent image (5) is represented by simultaneously combining the difference in the drawing line angle shown in FIG. 3A and the difference in the area ratio shown in FIG. 3B. May be. In this form, the drawing line may be either flat or a raised drawing line having a ridge.

What is important in constructing the latent image (5) is that no area having no image is provided. That is, there must be no region where the area ratio of the latent image (5) is zero, except for regions such as accessories that do not contribute to the change effect. The glitter image (4) always overlaps the upper layer of the latent image (5). Since the latent image (5) has a light/dark flip-flop property or a color flip-flop property, it is basically resin-rich or film-thickness rich. Therefore, in most cases, the area in which the latent image (5) is formed is excellent in ink transfer property, as compared with the area in which the base material (2) is exposed. If there is a region with an area ratio of zero in the latent image (5), the transferability of the glittering image (4) that is overlaid is locally extremely smaller than that in a region with zero or more. Therefore, the structure of the latent image (5) under the diffuse reflection light may be reflected in the shade of the glitter image (4) and may be visualized. In order to surely prevent the problem of visualization of the latent image (5) due to the difference in the ink transfer property, it is desirable that the area ratio of the latent image (5) is at least 15% or more.

Since the latent image (5) has a light-dark flip-flop property or a color flip-flop property, the reflected light generated from the glitter image (4) superposed on the latent image (5) is raised and directly superposed on the substrate (2). The amount of reflected light is relatively increased as compared with the case. In this way, the latent image (5) serves to increase the amount of reflected light of the glitter image (4) and enhance the vanishing effect under regular reflection light. The effect of raising the reflected light by the latent image (5) is an essential function for enhancing the change effect of the present invention. The above is the description of the latent image (5).

Finally, the color image (6) will be described. The color image (6) shown in FIG. 4 is composed of two or more colors having different hues and including at least one chromatic color. Therefore, in the case of a two-color configuration having the minimum number of colors in the color image (6), one color may be an achromatic color such as white, gray, or black, but the other color must be a chromatic color. Must be used. Therefore, the color image (6) needs to be at least a combination of “one achromatic color and one chromatic color”. This is because when the color image (6) is composed of a combination of achromatic colors or only one chromatic color, the characteristics of the present invention cannot be utilized without changing the monotone expression of the conventional technique. An example of the minimum color configuration of the color image (6) is a combination of "one achromatic color + one chromatic color" such as "white+red" or "black+yellow", but of course, "red" It is possible to use two chromatic colors such as +blue and yellow/green, and it goes without saying that there is no problem even if there are three or more chromatic and achromatic colors combined, and conversely, to utilize the features of the present invention. Is more desirable.

The color image (6) represents the color of the first color image that appears in the printed image (3) under diffuse reflected light, and the second color that appears in the printed image (3) under specular reflected light. It also represents the color of the image. For this reason, it is necessary that the glittering image (4) showing the shade of the first color image and the latent image (5) showing the shade of the second color image can be combined without any contradiction. The characteristic that the shades of two different images of the glitter image (4) and the latent image (5) and the color of the color image (6) are consistently matched with each other is referred to as “the glitter image (4) and the latent image ( 5) each has color sharing property with the color image (6)”.

A specific example of color sharing in the present embodiment will be described. 5A is a composite image (7(4+6)) in which the glitter image (4) and the color image (6) are superimposed, and FIG. 5B is a latent image (5) and the color image ( 6) is a combined image (7(5+6)). The color image (6) of the present embodiment is originally adjusted based on the color of the second color image so as not to cause a contradiction when applied to the color of the first color image under diffuse reflection light. It is an image. In other words, "the glitter image (4) and the latent image (5) have color sharing property with the color image (6)", in other words, the color sharing is performed between the first color image and the second color image. Therefore, first, at the stage of designing the first color image and the second color image, it is necessary to make the color and the color arrangement have commonality.

Actually, whether or not the glitter image (4) and the latent image (5) have the color sharing property with the color image (6) is determined as shown in FIGS. 5A and 5B. , Visually confirm the composite image (7), which is the composite of the glitter image (4) and the color image (6), on the image processing software or on the plate-making film, and check whether the shade and color of the composite image (7) are consistent. It is necessary to confirm and also to visually confirm the composite image (7) in which the latent image (5) and the color image (6) are composited, and to confirm whether the shade and color of the composite image (7) are consistent. is there.

When the first color image and the second color image are freely designed, it is impossible to completely match the color arrangement of the two color images, which are originally different images. Therefore, first, in order to establish a relationship in which the glitter image (4) and the latent image (5) and the color image (6) have color sharing property, the first color image and the second color image themselves are formed. Should be designed as an image with similar color arrangement. First, at the stage of designing the first color image and the second color image, it is difficult to ensure the final color sharing property unless consideration is given to making the color arrangement the same to some extent.

When designing the first color image and the second color image, especially the red part arranged in the green, the yellow part arranged in the blue, etc. It is desirable to design with an emphasis on giving commonality to the color arrangement of parts. The difference between the color and the shade in the part with a large color difference makes the observer feel the most discomfort. Conversely, if the color of the part with a large color difference matches the shade, the observer will not feel discomfort with the image. As described above, first, the first color image and the second color image are designed so that the shade and the color of the portion having the largest color difference match as much as possible.

After devising the design of the first color image and the second color image, if there is no room for further color sharing, or the customer designs the first color image and the second color image, In cases where there is no room for improvement on the design side, such as when further improvement in design cannot be expected, and there is still a large contradiction in shade and color, the color of the area where the color image (6) has a contradiction is changed. It is necessary to make adjustments or devise such as performing image processing such as blurring and gradation. The following describes some means of increasing color sharing.

The most reliable and easy method of increasing the color sharing property, that is, eliminating the contradiction between the shade and the color, is to make the color of the color image (6) in the contradiction area closer to an achromatic color. That is, the color saturation of the inconsistent portion of the color image (6) may be reduced. As a matter of course, when the color image (6) is composed only of achromatic colors such as white, gray, and black, the color of the color image (6) with respect to the shade of the glitter image (4) and the latent image (5) There is no contradiction with. Therefore, if the saturation of the color image (6) is reduced, the contradiction between the density and the color is reduced and the color sharing property is reduced regardless of the combination of the first color image and the second color image. It will always be improved in a relatively high direction. However, the closer the color image (6) becomes to the achromatic color, the more the colorization effect of the present invention is impaired, and the effect of the present invention is reduced. Therefore, it is desirable to keep the width to the minimum possible. If the saturation C ^* is 3 or more, even if the glitter image (4) is overlaid with a relatively high area ratio, it can be recognized as a chromatic color, so that one of the desirable conditions for the color image (6) is At least one color having a degree C* of 3 or more is provided. The saturation C ^* is a numerical value in the CIE L ^* a ^* b ^* color space.

In addition to adjusting the color of the color image (6), partially blurring the color image (6) is also effective in eliminating the contradiction between the shade and the color. For the blurring process, a function installed as one of the effects of general image processing software may be used. When the blurring process is performed, the boundary of the color is blurred and it is difficult to distinguish the surrounding color from the surrounding color, so that the redundancy of the color configuration can be increased. This is desirable image processing for imparting color sharing to two different images of the glitter image (4) and the latent image (5) to the color image (6). In addition, gradation processing for gently changing colors is also effective.

In the example of the present embodiment, the color of the second color image is used as the base and the color is adjusted so that it can be applied to the color of the first color image to form the color image (6). However, the present invention is not limited to this method. Instead of the color image of the first color image, the color of the first color image may be adjusted so that the color image can be applied to the color of the second color image. The color and the color of the second color image may be averaged to form the color image (6). In any case, a configuration may be used in which the color of the color image (6) finally adapts to the glitter image (4) and the latent image (5) without contradiction.

In the present embodiment, based on the color of the second color image, blurring processing is performed on the color image (6) so that the presence of the second color image cannot be detected when the glitter image (4) overlaps. Was applied. The blurring function of the image processing software was used for the blurring processing. By following such a procedure, the color of the first color image and the color of the second color image are not inconsistent.

It should be noted that the green leaves that are common to the first color image and the second color image and whose images do not change were not blurred. Although this green leaf is included in the printed image (3), it does not change under diffuse reflection light or regular reflection light, and the change effect does not occur. As described above, the pattern which is included in the print image (3) but does not cause the change effect is a simple addition, a so-called accessory, which deviates from the essential constitution of the anti-counterfeit printed matter of the present invention, and deviates from various essential condition groups. There is no problem in designing under the conditions. The above is the description of the color image (6).

Next, the layer structure of the anti-counterfeit printed matter (1) of the present invention will be described with reference to FIG. A typical layered structure of the present invention is shown in FIGS. 6(a), 6(b) and 6(c). FIG. 6A shows a structure in which the latent image (5) is superposed on the color image (6) and the glitter image (4) is superposed on the latent image (5), which is shown in FIG. 6B. Is a structure in which the color image (6) is superposed on the latent image (5) and the glitter image (4) is superposed thereon. FIG. 6C shows a form in which the glitter image (4) is superposed on the latent image (5) and the color image (6) is superposed thereon. What is essential in these layer structures is that the glitter image (4) overlaps the latent image (5), and the reflected light amount of the glitter image (4) depends on the latent image (5). This is because the effect of raising the volume works and the effect of disappearing the glitter image (4) under the specular reflection light increases.

The effect of the anti-counterfeit printed matter (1) of the present invention formed with the above configuration will be described with reference to FIG. 7. The light source (8), the anti-counterfeit printed matter (1) and the observer (9) are placed in a positional relationship as shown in FIG. 7(a), and the anti-counterfeit printed matter (1) is observed at an observation angle (printed matter) where diffuse reflection light is dominant. When observed at an angle of incidence of light that is incident on the eye and an angle at which the observer (9) and the printed matter are significantly different from each other), the printed image (3) shows the light and shade of the glitter image (4). The first color image in which the colors of the color image (6) are combined is visually recognized. On the other hand, the shading of the second color image represented by the latent image (5) is hidden by the shading of the glitter image (4) and cannot be recognized by the observer.

In addition, as shown in FIG. 7B, the anti-counterfeit printed matter (1) is dominated by the angle under the specular reflection light (the angle of light incident on the printed matter and the reflection angle connecting the observer (9) and the printed matter). , The shade of the first color image disappears, and the shade (the intensity of reflected light) represented by the latent image (5) and the color of the color image (6) are observed. The second color image, which is the composite image (7) of FIG. As described above, the image visually recognizable in the printed image (3) under the diffuse reflection light and the regular reflection light is changed from the first color image to the second color image. The above is the description of the effects of the present invention.

The basic principle of changing two images according to the present invention is as follows. At the observation angle where the diffuse reflected light is dominant as shown in FIG. 7A, the glitter image (4) and the color image (6) are images having object colors, and the latent image (5) is transparent. Or, since it is a semi-transparent image, only the glitter image (4) and the color image (6) are combined and viewed by the observer (9) at the same time. Therefore, the first color image, which is an image in which the glitter image (4) and the color image (6) are combined, is visually recognized by the observer (9) at the observation angle where the diffuse reflected light is dominant. .. On the other hand, under specular reflection light, the glitter image (4) reflects light, so that the brightness of the glitter image (4) is increased, and the shade of the glitter image (4) is compressed. The person (9) cannot visually recognize the glitter image (4). In one latent image (5), the intensity of the reflected light is generated due to its optical characteristics under the specular reflection light, and the grayscale information of the latent image (5) represented by the intensity of the light appears. Further, since the color image (6) is composed of the normal coloring ink, the color does not greatly change even under the regular reflection light. Therefore, the first color image disappears under the specular reflection light, and the second color image in which the shade of the latent image (6) and the color of the color image (6) are combined is visually recognized. The above is the explanation of the principle of the effect expression of the present invention.

When the anti-counterfeit printed matter (1) of the present invention is formed, it can be formed by offset printing with high productivity. In this case, the bright and dark flip-flop property can be imparted to the glitter image (4). In addition, letterpress printing, gravure printing, flexographic printing, screen printing, intaglio printing, etc. can also be used. When forming the glitter image (4) by a printing method with a large amount of ink transfer such as gravure printing, flexographic printing, screen printing, intaglio printing, it is possible to use a special functional pigment having a large pigment particle system. In this case, a color flip-flop property can be added. In addition, especially in the case of screen printing, the amount of transferred ink is large and the resin of the ink used itself also has a high gloss. Therefore, adding a small amount of a general color pigment such as red or blue strongly reflects light. Can be used as a colored ink. The latent image (5) and the color image (6) can also be formed by highly productive offset printing or letterpress printing, and flexographic printing, gravure printing, screen printing, intaglio printing, etc. can be performed according to the manufacturer's seeds. You may use. It can also be formed by a printer such as an inkjet or laser. In the case of forming with a printer, variable printing is possible with different latent images provided one by one, which is optimal for providing personal information such as a resident card or passport.

Hereinafter, an example of the forgery-preventing printed material (1) specifically manufactured according to the above-described mode for carrying out the invention will be described in detail, but the present invention is not limited to this example.

An example of the present invention will be described with reference to FIGS. 1 to 6 as in the embodiment. First, as the base material (2), a highly versatile fancy paper (Gradios CC: made by Nippon Paper Industries) was used. Next, a color image (6) was printed with a laser printer (IPSIO SP C820: manufactured by RICOH). The color image (6) is a pattern in which pink and white cherry petals with yellow petals float on a blue background (green leaves are accessories, and are excluded because they are not essential constituents), The highest saturation in the pattern was the background blue color, and the saturation C ^* was 11.2. A latent image (5) showing the two petals of the cherry tree shown in FIG. 2 was screen printed on it with a transparent screen ink (made by UV FIL-383 Clear Teikoku Ink), and the branches of the cherry tree were shown on it. The glitter image (4) was printed by offset printing using a silver ink (Dicure R Silver: manufactured by DIC). The maximum area ratio of the glitter image (5) was 85% and the minimum area ratio was 40%. The layer structure is as shown in FIG.

FIG. 7 shows the effect of the anti-counterfeit printed matter (1) of the present invention. FIG. 7A is an image observed when an observer (9) observes the anti-counterfeit printed matter (1) under diffuse reflection light, and the printed image (3) includes pink and white. The colorful cherry blossom branches were visible. On the other hand, as shown in FIG. 7B, when an observer (9) observes the anti-counterfeit printed matter (1) under specular reflection light, pink and white cherry petals appear in the printed image (3). An image of colorful cherry petals with yellow petals was visible inside. As described above, the effect of changing two different color images under the diffuse reflection light and the regular reflection light was confirmed.

1 Anti-Counterfeiting Printed Material 2 Base Material 3 Printed Image 4 Glittering Image 5 Latent Image 6 Color Image 7 Composite Image 8 Light Source 9 Observer

Claims (3)

At least a part of the base material is provided with a print image of a color different from that of the base material,
The printed image is a color image composed of two or more colors having different hues including at least one chromatic color;
Brightness that has at least one of the light-dark flip-flop property and the color flip-flop property, has an object color different from that of the base material, and is formed in a range of a predetermined area ratio to show a shade. Image and
A latent image image formed by laminating a transparent or semitransparent latent image element having an optical characteristic of at least one of light and dark flip-flop property or color flip-flop property is laminated,
The latent image and the glitter image have color sharing with the color image,
The latent image is located in a lower layer than the glitter image,
i) formed by the difference in area ratio of said latent image elements, or
ii) It is formed by the difference in the arrangement direction of the latent image elements having the protrusions which are regularly formed in a line at a predetermined pitch,
When observing the printed image under diffuse reflection light, the first color image is visually recognized by combining and visualizing the glitter image and the color image,
When the printed image is observed under regular reflection light, the glitter image disappears, and the second color image is visually recognized by combining the latent image and the color image for visualization. Anti-counterfeit printed matter. The anti-counterfeit printed matter according to claim 1, wherein the color image includes at least one chromatic color having a saturation C ^* of 3 or more. The anti-counterfeit printed matter according to claim 1 or 2, wherein the latent image is composed of an area ratio of 15% or more.

Images