JP2021154598A - Latent image printed matter - Google Patents

Abstract

To provide a latent image printed matter having different two authenticity determination functions of an authenticity determination function using a dynamic visual effect of a moire pattern that can be authenticated by every one and latent image authentication visibly conceivable only when observed with light of a particular wavelength authenticable only by a limited information disclosure target person.SOLUTION: A latent image printed matter provided with a printed image obtained by laminating, in order, on a substrate, a semi-cylindrical element group having optical performance of at least any one of light dark flip flops or color flip flops, and a regularly arranged semi-cylindrical elements having a build-up, and a latent image element group being different in hue from the semi-cylindrical element group under a regular reflection light and being formed by regular arrangement of a pitch and an angle by differentiating at least one of the pitch and the angle from the semi-cylindrical element, in which a latent image is formed by dividing into the first latent image element group and the second latent image element group different in absorption characteristics or emission characteristics in light of specific wavelength band.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, which require anti-counterfeiting effect, the image that can be observed changes according to the angle of light incident on the printed matter. In addition to the moving image effect, it is related to anti-counterfeit printed matter in which another image can be visually recognized when observed under a special light source.

Recent advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce elaborate copies of security printed matter. As one of the anti-counterfeiting technologies to prevent such duplication and counterfeiting, it has a video-like visual effect that makes the observable image appear to move like a hologram, and everyone can discriminate the authenticity without using tools. There are many optical security elements that can be used. While these technologies can be used by everyone to determine the authenticity, they are likely to be targets for counterfeiting because their existence is recognized by counterfeiters. On the other hand, contrary to holograms that can be authenticated by everyone, there is also anti-counterfeiting technology that only a limited number of people can know its existence and can determine the authenticity only by using special tools. Although the number of people who can use them for authenticity discrimination is limited, they are unlikely to be the target of counterfeiters because the information is highly confidential and the existence itself is not disclosed. Each technology has advantages and disadvantages.

Unlike conventional anti-counterfeiting technology, which is formed by printing with ink, holograms are formed using complicated manufacturing processes and special materials, so it takes more time to manufacture than conventional anti-counterfeit printed matter. And it is extremely expensive. From this, anti-counterfeit printed matter that can form a moving visual effect similar to a hologram by a general printing method by superimposing special materials or using a complicated halftone dot configuration is known. Has been printed.

Applicants use common and relatively inexpensive materials and simple printing means, but at an observation angle under diffuse reflection light, information perceived by the human eye at a specific part of the printed matter can be obtained. We have already applied for an invention relating to an anti-counterfeiting technique having a moving visual effect of a moire pattern by changing the observation angle under specular light (see, for example, Patent Document 1).

In addition to the above-mentioned moving image effect of the observable image, the applicant observes a completely different image when the image seen under a normal light source is observed through an infrared camera or a sharp cut filter. We have already applied for a special anti-counterfeiting technique that can be applied (for example, Patent Document 2 and Patent Document 3).

Japanese Patent No. 4844894 Japanese Patent No. 3544536 Japanese Patent No. 4441632

The technique of Patent Document 1 is to compress an image, a pixel, or a pixel formed by a pitch slightly different from a specific pitch on a group of Kamaboko-shaped images composed of a glossy kamaboko image line at a specific pitch. By superimposing the created images, image lines, pixels, or images appear as moire, and by changing the observation angle, the appearing moire appears to move. With this technology, even if a moving moire can be visually recognized, a latent image that allows a completely different image to be observed when observed through light having a different wavelength band, which is provided in the technologies up to Patent Document 2 and Patent Document 3, is provided. It was impossible to do.

The techniques described in Patent Documents 2 and 3 have the effect that when an image viewed under a normal light source is observed through an infrared camera or a sharp cut filter, a completely different image can be observed, as in Patent Document 1. It was impossible to visually recognize the moving visual effect of moire when the observation angle was changed.

The present invention aims to solve the above-mentioned problems, and is a latent image printed matter having a moving visual effect in which a moire pattern appears to move by changing the observation angle under specularly reflected light. It is a latent image printed matter characterized in that a latent image image that was not visually recognized can be visually recognized when observed with light in a specific wavelength band. That is, there are two different types of visual effects: a video-like visual effect that can be authenticated by everyone, and a latent image authentication that can be authenticated only by a limited number of people subject to information disclosure and can be visually recognized only when observed with light in a specific wavelength band. It has two authenticity discrimination functions.

The latent image printed matter of the present invention comprises a printed image in which a semi-cylindrical element group and a latent image element group are sequentially laminated on at least a part of a base material.
The Kamaboko-shaped element group has at least one of light and dark flip-flop or color flip-flop optical characteristics, and is composed of regularly arranged Kamaboko-shaped elements having ridges.
The latent image element group consists of latent image elements whose colors are different from those of the kamaboko element group under specular reflection light, which are regularly arranged with at least one difference in pitch and angle from the kamaboko element.
The latent image element group has the same color under visible light, and is divided into a first latent image element group and a second latent image element group having different absorption characteristics or emission characteristics in light of a specific wavelength band. The image is formed,
When observing under specular light, the moiré pattern is visually recognized, and when the observation angle of the printed image is changed, the moiré pattern moves and is visually recognized.
When observed by irradiating light in a specific wavelength band, the moire pattern disappears and the latent image is visually recognized.

The latent image printed matter of the present invention further includes a visible image element group that forms a visible image that can be visually recognized under diffuse reflection light in at least a part of the printed image, and the visible image element group has light absorption characteristics in a specific wavelength band. Alternatively, it does not have light emitting characteristics.

In the latent image printed matter of the present invention, a specific wavelength band is infrared rays, one of the first latent image element group and the second latent image element group is formed of black ink having infrared absorption characteristics, and the other absorbs infrared rays. It is characterized by being formed of cyan, magenta, and yellow ink having no sexual properties.

The latent image printed matter of the present invention is characterized in that a reflective layer having a property of reflecting light is laminated between the kamaboko-shaped element group and the latent image element group.

The latent image printed matter of the present invention has a moving visual effect of a moire pattern under positively reflected light that can be identified by everyone without using a special tool, and an infrared camera, an ultraviolet camera, and an ultraviolet lamp. , A band pass filter, a cut filter, and other special tools are provided in one technology for different authentication means for confirming a latent image that can be used for authenticity discrimination only by a limited number of persons subject to information disclosure.

Further, in the latent image printed matter of the present invention, even if the counterfeiter can imitate the moving image effect in which the moire pattern appears to move, the counterfeit product can be easily eliminated depending on the presence or absence of the hidden latent image image, so that the counterfeit resistance Power is high.

Further, since the latent image printed matter of the present invention can be given a latent image element group by a printer, it is applied to so-called variable information printing in which the information to be applied to each printed matter is different for both the visible information and the latent image image. can do.

The latent image printed matter of this invention is shown. The structure of the latent image printed matter of this invention is shown. The structure of the Kamaboko-shaped element group of the present invention is shown. The structure of the semi-cylindrical element group and the latent image element group in the latent image printed matter of the present invention is shown. The configuration of the latent image element group of the present invention is shown. The effect of the latent image printed matter of the present invention is shown. Another configuration of the latent image printed matter of the present invention is shown. A latent image printed matter according to another embodiment of the present invention is shown. The configuration of the latent image printed matter in another embodiment of the present invention is shown. The configuration of the visible image element group in another embodiment of the present invention is shown. Another configuration of the visible image element group in another embodiment of the present invention is shown. The effect of the latent image printed matter in another embodiment of the present invention is shown.

A mode 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 as long as it is within the scope of the technical idea in the claims.

The "normal reflection" in the present invention 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, and the "diffuse reflection" is a substance. When light is incident at a certain incident angle, weak reflected light is generated at an angle different from the angle of the incident light. For example, in the case of iris-colored pearl ink, it looks colorless and transparent in the state of diffuse reflection, but emits strong light of a specific interference color in the state of specular reflection. Further, "observing under specularly reflected light" refers to a state of observing from a viewpoint at a reflection angle substantially equal to the angle of light incident on the printed matter, and "observing under diffusely reflected light" means observing under diffusely reflected light. It refers to the state of observing at an angle that is significantly different from the angle of the light incident on.

Further, the "color" in the present invention represents a color including the concepts of hue, saturation and lightness, and the "different color" is different from any one of hue, lightness or saturation. Or, it means that their combination is different. Further, the "color difference" in the present invention shall be defined by ΔE of the CIE1976L * a * b * color system. The CIE1976L * a * b * color system is a color space recommended by the CIE (International Commission on Illumination) in 1976, and is defined in JIS Z 8729 in the Japanese Industrial Standards. The color difference is the distance in the color space of two colors, and the color difference in the CIE1976L * a * b * color system is the difference between the two colors L *, the difference a *, and the difference b *. It can be calculated by adding the squares of each and taking the square root. In this specification, achromatic colors such as white, gray, and black are also considered as one color.

Further, "disappearance" in the present invention means that by changing the observation conditions, the information that has been visually recognized until then becomes visually invisible.

Further, the "picture line" in the present invention is a dotted line, a broken line, a straight line, a curved line, and a broken line in which halftone dots, which are small points of the smallest unit forming a printed image, are continuously arranged in a specific direction for a certain distance. Refers to broken lines, etc., and "pixels" are circles, triangles, polygons including squares, stars, and other figures, or characters and symbols, which are a collection of at least one printing halftone dots or multiple printing halftone dots. Refers to numbers, etc.

(First Embodiment)
As the first embodiment, the basic configuration of the latent image printed matter (1) in the present invention will be described with reference to FIGS. 1 to 7. First, FIG. 1A shows a latent image printed matter (1) of the present invention. The latent image printed matter (1) has a printed image (3) on the base material (2). Further, as shown in FIG. 1 (b), the printed image (3) includes at least a semi-cylindrical element group (4) and a latent image element group (7), and has a layer structure of a base material (2). First, a kamaboko-shaped element group (4) is formed, and a latent image element group (7) is laminated on a layer above the kamaboko-shaped element group (4). The color of the printed image (3) may be transparent or opaque, and may have any color. Hereinafter, details of each part will be described in order.

(Base material)
First, the base material (2) will be described. The base material (2) may have a flat surface on which the printed image (3) can be formed, and the material is not particularly limited to high-quality paper, coated paper, plastic, metal, or the like. Further, there is no particular limitation on the color and size of the base material (2).

(Kamaboko element group)
Next, the Kamaboko-shaped element group (4) will be described with reference to FIGS. 2 and 3. FIG. 2A is a diagram showing a latent image printed matter (1), and FIG. 2B is a cross-sectional view taken along the line AA'of FIG. 2A. Further, FIG. 3 shows an example of a semi-cylindrical element group (4) formed on the base material (2). As shown in FIGS. 2 (b) and 3, the semi-cylindrical element group (4) is a straight line having a constant width (W1), has a constant raised height, and has a semi-cylindrical shape (kamaboko-shaped element). 5) are arranged in plurality with regularity. In the present invention, "arranging a plurality of elements with regularity" means a state in which a plurality of elements are arranged at a predetermined pitch and in a predetermined direction. More specifically, with reference to FIG. 3, the kamaboko-shaped elements (5) are continuously arranged at a constant pitch (P1) in the first direction (S1 direction in the drawing) orthogonal to the image line direction. Consists of. In the embodiment, the Kamaboko-shaped element group (4) will be described as an example composed of a set of Kamaboko-shaped straight lines having ridges, but the Kamaboko-shaped element group (4) in the present invention is limited to this. It may be composed of curved lines, dividing lines, etc. as long as it has a bulge, or it may be simply arranged vertically and horizontally at equal pitches as a semi-cylindrical pixel form (4). May be.

(Means for forming Kamaboko-shaped elements)
When forming the Kamaboko-shaped element group (4), the means for forming the Kamaboko-shaped element group (4) is not particularly limited as long as a certain swelling height can be formed. When forming by printing, screen printing, concave printing, gravure printing, flexographic printing, etc. are suitable, but offset printing, letterpress printing, etc. are not suitable. Further, the Kamaboko-shaped element group (4) may be formed by thickly filling ink with an ink jet or a laser printer without any problem.

In the present invention, the height of the raised image of the Kamaboko-shaped element (5) is not particularly limited, but it is not desirable to have a height of 1 mm or more in consideration of distribution suitability as a printed matter. Further, when the semi-cylindrical element (5) is formed by ink and the thickness of the film is 2 μm or less, the image change effect may be reduced. Therefore, when the kamaboko-shaped element (5) is formed by an ink film, it is preferably 2 μm or more and 1 mm or less.

It is desirable that the constant pitch (P1) common to the image lines of the Kamaboko-shaped element group (4) is formed at 0.01 mm or more and 5.0 mm or less. When the kamaboko element (5) is formed with a bulge of 2 μm or more, the pitch of the kamaboko element (5) that can be reproduced by general printing is 0.01 mm or less, which is almost the limit pitch. , It is not preferable because it lacks the stability of printed matter quality. Further, even if the elements can be formed at a pitch of 0.01 mm or less, in most cases, the visibility of the appearing latent image becomes extremely low, which is not preferable. On the contrary, when the image is formed at a pitch of 5.0 mm or more, the resolution of the image that can be reproduced as a latent image becomes extremely low, which is not preferable.

(Characteristics of Kamaboko-shaped elements)
The Kamaboko-shaped element group (4) needs to have a property of strongly reflecting light when light is incident. Specifically, at least one of the characteristics that the brightness (brightness) increases when light is incident, that is, the so-called light-dark flip-flop property, or the characteristic that the hue changes when light is incident, that is, the so-called color flip-flop property. It must have one of the optical characteristics.

The light-dark flip-flop property can be easily imparted by blending a general metal pigment such as aluminum, brass, or iron oxide in the ink, and the ink film thickness for screen printing, gravure printing, flexographic printing, etc. If you use a printing method that can form thick ink, you can use a varnish for general printing inks such as urethane resin, acrylic resin, alkyd resin, epoxy resin, polyester resin, and phenol resin, which are varnish components used for ink. , Sufficient function is produced to exhibit the effect of the present invention. Further, the color flip-flop property can be imparted by blending a functional pigment having the color flip-flop property in the ink. Examples of these functional materials include pearl pigments, metallic pigments, glass flake pigments, effect pigments, metal powder pigments, scale pen-like metal pigments, and the like. The amount of reflected light of the Kamaboko-shaped element group (4) is directly linked to the high visibility of the moire pattern that appears during normal reflection, so it is desirable that it is high. As long as it has flip-flop properties, it may be transparent or translucent, or it may be colored with an object color. The above is the explanation of the Kamaboko-shaped element group.

(Structure of latent image element group)
Subsequently, the latent image element group (7) will be described with reference to FIG. In the first embodiment, the latent image image (3) is formed from the scabbard element group (4) and the latent image element group (7), and the latent image element group (7) is the first latent image element. It includes a group (7A) and a second latent image element group (7B). The first latent image element group (7A) and the second latent image element group (7B) are separated from each other. In this embodiment, it represents "AB1234567"). When the first latent image element group (7A) represents information with a positive, the second latent image element group (7B) is a negative, and the first latent image element group (7A) represents information with a negative. If so, the second latent image element group (7B) is positive. As described above, the first latent image element group (7A) and the second latent image element group (7B) are fitted to each other in a negative-positive relationship to form the latent image element group (7).

In the above example, the latent image is represented by alphabets and numbers such as "AB1234567", but the present invention is not limited to this, and includes letters, numbers, symbols, circles, triangles, and quadrangles. It may be a figure such as a polygon or a star, a mark, a pattern such as a face, or the like.

Subsequently, the configuration of the latent image element group (7) will be described. As shown in FIG. 5, the latent image element group (7) is composed of a plurality of linear latent image elements (8) having a constant width (W2) arranged with regularity, and the latent image element (8). Are continuously arranged at a constant pitch (P2) in the first direction (S1 direction in the drawing) orthogonal to the image line direction. The latent image element group (7) is composed of a first latent image element group (7A) and a second latent image element group (7B) fitted together, and is composed of a first latent image element group (7A). ) And the second latent image element group (7B) are both composed of the latent image element (8).

The constant pitch (P2) common to all the strokes constituting the latent image element group (7) is the same as the constant pitch (P1) common to the strokes of the kamaboko element group (4), and 0. It is desirable to form it at 01 mm or more and 5.0 mm or less. The reason is as described above and will be omitted.

(Moire pattern)
Subsequently, the configuration for generating the moire pattern will be described. In the first embodiment, the Kamaboko-shaped element group (4) and each element constituting the latent image element group (7) laminated on the Kamaboko-shaped element group (4) interfere with each other to generate a moire pattern. Further, regardless of the simplicity and complexity of the moire pattern, in order to cause the moire pattern by interfering with the kamaboko element group (4) and the latent image element group (7), the kamaboko element group (4) that interferes with each other. ) And the latent image element group (7) need to be slightly different in regularity. More specifically, the requirement that constitutes the regularity of the latent image element group (7), that is, at least one condition of pitch and angle is a requirement that constitutes the regularity of the kamaboko element group (4). The pitch and angle should be slightly different. Hereinafter, a detailed description will be given.

In the first embodiment, the arrangement pitch (P2) of the latent image element (8) in the latent image element group (7) is the arrangement pitch (P1) of the kamaboko element (5) in the kamaboko element group (4). And slightly different. Further, the angles of the kamaboko elements (5) in the kamaboko element group (4) are arranged at 90 degrees with respect to the S1 direction in the figure, whereas as shown in FIG. 5, the latent image element group ( The angles (A degrees) of the latent image element (8) in 7) are slightly different. Regarding the difference in pitch, if the pitch of the kamaboko element (5) in the kamaboko element group (4) is 100, the pitch of the latent image element (8) in the latent image element group (7) is about 80 to 120. By setting the range (excluding 100), a moire pattern can be generated. Further, when it is set to about 90 to 110, the moire pattern is visually recognized sharply, and the movement of the moire pattern becomes large. Regarding the angle difference between the Kamaboko-shaped element (7) and the latent image element (8), it is desirable to keep the difference within 5 degrees and set it to 3 degrees or less.

In the above description, an example of stacking latent image element groups (7) having the same size as the kamaboko element group (4) is shown, but the present invention is not limited to this, and the kamaboko element group is not limited to this. The region in which the latent image element group (7) is laminated on (4) may be the same region, or may be larger or smaller than the Kamaboko-shaped element group (4).

In the embodiment, the latent image element group (7) will be described as an example composed of a set of straight lines, but the latent image element group (7) in the present invention is not limited to this, and is a curved line. It may be composed of a dividing line or a dividing line, or it may be in a pixel form.

(Colors of Kamaboko-shaped elements and latent image elements)
The semi-cylindrical element group (4) and the latent image element group (7) may be transparent or may have a specific colored color. However, it is more preferable that only one of the Kamaboko-shaped element group (4) and the latent image element group (7) is colored. This is because when both the Kamaboko-shaped element group (4) and the latent image element group (7) are colored, the moire pattern that should originally appear under specular reflection light is visualized under diffuse reflection light. Because. Even if the moire pattern is visualized, the effect of moving the moire pattern under specular light is produced, and the effect of the present invention itself is guaranteed, but the moire pattern that was invisible under diffuse reflection light is under specular light. It is more preferable that only one of the moiré element group (4) and the latent image element group (7) is colored because there is no impact that appears at once.

The visibility of the moire pattern is determined by the difference in optical characteristics between the Kamaboko-shaped element group (4) and the latent image element group (7), that is, the difference in color during specular reflection. As a specific characteristic of the latent image element group (7) for giving a certain visibility to the moire pattern, the color of the limb-like element group (4) at the time of normal reflection is compared with that of the limb-like element group (4). The difference in color at the time of normal reflection of the latent image element group (7) in the state where the latent image element group (7) is laminated on the surface, that is, in the state of being completed as a so-called printed image, needs to be different by 10 or more in the color difference ΔE. Further, since the Kamaboko-shaped element group (4) has a characteristic that the amount of reflected light during specular reflection is high, the latent image element group (7) has a characteristic that the amount of reflected light during specular reflection is low, that is, low gloss (matte). ) Is desired.

In the first embodiment, the moire pattern that appears under specularly reflected light is a simple vertical striped pattern that is slightly tilted, and is formed by strokes like the Kamaboko-shaped element group (4). , Not limited to this. Unlike the moire pattern of the first embodiment, which is a simple striped pattern, it is possible to make more complicated characters and figures appear as a moire pattern by using a phenomenon called "moire magnification". Yes, the latent image element group (7) in that case can be created by compressing an image such as a character or a figure to be made to appear according to the shape of the stroke or pixel of the moire element group (4). .. In order to make a complicated moire pattern appear using the above-mentioned "moire magnification", the structure and means described in Japanese Patent No. 4844894 may be used.

(Means for forming a group of latent image elements)
In the first embodiment, when the latent image element group (7) is formed by printing, an offset printing method or a flexographic printing method capable of printing at a relatively high resolution is suitable, as well as an inkjet printer or an inkjet printer. It can also be formed using a digital printing machine such as a laser printer. By using these digital printing machines, different information can be given to each printed matter, and variable information can be easily given.

Next, the conditions required for the present invention will be described. In the present invention, the first latent image element group (7A) and the second latent image element group (7B) constituting the latent image element group (7) are under diffuse reflection light and normal reflection light in the visible light region. It is the same color, but it needs to be a different color under diffuse reflection light of a specific wavelength band. The fact that these two element groups (7A, 7B) are the same color under diffuse reflection light and normal reflection light is to prevent the latent image from being visually recognized under diffuse reflection light and normal reflection light. It is a necessary condition. Further, it is a necessary condition for authenticating a latent image image that the colors are different under the diffuse reflection light of a specific wavelength band. The "equal color" in the present invention includes a relationship in which the observer can recognize the two colors as the same color or a difference in hue that is difficult to distinguish between the two colors. The target range is the range of colors in which the color difference ΔE in CIE L * a * b * is 6 or less.

(Relationship between light in a specific wavelength band and latent image)
The "light in a specific wavelength band" in the present invention may be light having an invisible wavelength such as ultraviolet rays or infrared rays outside the range of visible light (400 nm to 700 nm), or light in the visible light band of 400 nm to 700 nm. It may be a limited wavelength band inside. Diffuse reflected light and specular reflected light also exist in the light of these specific wavelength bands. In the present invention, when observing in a specific wavelength band, the observation is made not under specular reflection light but under diffuse reflection light. As described above, "light in a specific wavelength band" is not light in at least the entire visible wavelength band (400 nm to 700 nm), but light whose wavelength is limited to a part of visible light or wavelength other than visible light. It needs to be the light of the band. Further, the authentication means using the light of the specific wavelength band may be a light projecting means for irradiating and exciting the light of the specific wavelength band or a light receiving means for visualizing the light of the specific wavelength band. good.

For example, when ultraviolet rays are used as light in a specific wavelength band, a pigment that excites one of the first latent image element group (7A) and the second latent image element group (7B) with ultraviolet rays and emits light with visible light is used. If blended, a latent image will appear in the visible light region when irradiated with ultraviolet rays. Alternatively, a latent image may appear in a wavelength band other than the visible light region. Further, if one of the first latent image element group (7A) or the second latent image element group (7B) is composed of a pigment that absorbs ultraviolet rays and the other is composed of a pigment that does not absorb ultraviolet rays, an ultraviolet camera is used. The latent image can be visually recognized.

Further, when infrared rays are used as light in a specific wavelength band, infrared light is excited by exciting one of the first latent image element group (7A) and the second latent image element group (7B) with ultraviolet rays or visible light. If a pigment that emits light is mixed, ultraviolet rays or visible light can be irradiated, and a latent image can be visually recognized by observing with an infrared camera. Further, if one of the first latent image element group (7A) and the second latent image element group (7B) is composed of a pigment that absorbs infrared rays and the other is composed of a pigment that does not absorb infrared rays, an infrared camera can be used. The latent image can be visually recognized using. As described above, when irradiating and observing light in a specific wavelength band, a latent image appears.

Further, when the limited light in the visible light of 640 nm to 700 nm is the light of a specific wavelength band, one of the first latent image element group (7A) and the second latent image element group (7B) is 640 nm. If the pigment is composed of a pigment that relatively absorbs light from 640 nm to 700 nm and the other is composed of a pigment that does not relatively absorb light from 640 nm to 700 nm, it can be observed through a sharp cut filter that transmits only visible light from 640 nm to 700 nm. , The latent image can be visually recognized. The above is a description of the relationship between light in a specific wavelength band and a latent image.

(effect)
Subsequently, the effect of the latent image printed matter (1) of the present invention will be described with reference to FIG. When light is incident on the latent image printed matter (1) as shown in FIG. 6 (a) and the observer (14) observes the latent image printed matter (1) with the naked eye under diffuse reflection light, the latent image printed matter (1) is observed with the naked eye. ) Or one of the latent image elements (7) can be visually recognized, or when the glamorous element group (4) and the latent image element group (7) are transparent, nothing can be visually recognized. On the other hand, as shown in FIG. 6B, when the observer (14) observes the latent image printed matter (1) under specularly reflected light, a moire pattern that could not be visually recognized until then appears, and the observation angle. The moire pattern appears to move by changing. Furthermore, when light in a specific wavelength band is irradiated or light in a specific wavelength band is visualized, the observer (14) can see a latent image image that could not be visually recognized under diffuse reflection light and specular reflection light. Will be done. In this case, for example, when the specific wavelength in the first embodiment is infrared rays, as shown in FIG. 6 (c), when the latent image printed matter (1) is observed using the infrared camera (15). The latent image image "AB1234567" is visually recognized through the infrared camera (15). As described above, it has two effects, that is, a moving image effect in which the moire pattern appears to move according to the observation conditions, and an effect in which the latent image image is visually recognized.

The reason why the above effects occur will be described. As shown in FIG. 6A, when the observer (14) observes the latent image printed matter (1) under diffuse reflection light, only the image having the object color is visually recognized. When either one of the Kamaboko-shaped element group (4) or the latent image element group (7) has an object color, only one of the Kamaboko-shaped element group (4) or the latent image element group (7) is used. Is visually recognized. Further, when the Kamaboko-shaped element group (4) and the latent image element group (7) are transparent, nothing can be visually recognized, and when both have an object color, a moire pattern is visually recognized.

Next, as shown in FIG. 6B, when the observer (14) observes the latent image printed matter (1) under the specular reflected light, it has a light / dark flip-flop property or a color flip-flop property and has a swelling property. The brightness and hue of the Gamo-shaped element group (4) change, and the light is strongly reflected only on the surface of the image line that forms a normal with the incident light. At this time, only a part of the latent image element group (7) overlapping on the surface of the image line forming the normal with the incident light is sampled, and a moire pattern appears. In this moire pattern, when the inclination of the latent image printed matter (1) is changed and the angle of the incident light is changed, the position of the image line surface that strongly specularly reflects the light is changed, and the latent image element group (7) is sampled. It seems that the moire pattern is moving by changing the position of).

Subsequently, as shown in FIG. 6C, in the first embodiment, the specific wavelength is infrared rays, the first latent image element group (7A) absorbs infrared rays, and the second latent image element group (2). 7B) has a configuration that does not absorb infrared rays. With this configuration, when the latent image printed matter (1) is observed with the infrared camera (15), the latent image image by the first latent image element group (7A) configured to absorb infrared rays is visualized, and the second The latent image element group (7B) of is not visualized. As a result, the latent image image "AB1234567" can be visually recognized. The above is the reason why the effect of the latent image printed matter (1) of the present invention is produced.

When the visibility of the moire pattern appearing under the specularly reflected light is low, as shown in FIG. 7 (b) with respect to FIG. 7 (a) which is the first embodiment, the mosquito-shaped element A reflective layer (9) having a property of reflecting light may be provided between the group (4) and the latent image element group (7). The reflective layer (9) overlaps with the kamaboko-shaped element group (4) and raises the reflected light, thereby enhancing the visibility of the moire pattern.

The reflective layer (9) may be formed by plate printing such as offset or gravure, may be formed by plateless printing such as a digital printing machine, or may be formed by sticking a film or the like. good. For printing, an ink containing a glittering pigment such as silver ink, gold ink, or pearl ink may be used, and a general transparent film, aluminum film, multilayer interference film, or the like may be used as the film. The reflective layer (9) may have either light-dark flip-flop property or color flip-flop property, but when a specific wavelength is infrared rays, the reflective layer has an infrared absorbing ability. Since there is a problem that the visibility of the latent image is lowered when gold, silver ink or the like is used, it is preferable to reduce the area ratio of the reflective layer as necessary.

As described above, in the first embodiment of the present invention, a moire pattern that cannot be visually recognized under diffuse reflection light appears under the specular reflection light, and the moving image effect of the moire pattern is changed by changing the observation angle. In addition, the latent image can be visually recognized by observing with light in a specific wavelength band.

Subsequently, as a second embodiment, a mode in which a visible image different from the moire pattern or the latent image image can be visually recognized in the printed image under diffuse reflection light will be described.

(Second Embodiment)
The second embodiment will be described with reference to FIGS. 8 to 12. The difference between the second embodiment and the first embodiment is that a visible image different from the moire pattern or the latent image is visually recognized under diffuse reflection light, and this visible image is light in a specific wavelength band. It is characterized by being invisible when observed underneath. In the second embodiment, the matters not particularly described are the same as the configuration of the latent image printed matter (1) of the first embodiment, and thus the description thereof will be omitted.

(Visible pattern)
First, FIG. 8 shows a latent image printed matter (1). The latent image printed matter (1) has a visible image represented by the characters "Insatsu Hanako" in the printed image (3). In the second embodiment, the visible image is represented by characters, but the visible image is not limited to this, and various figures such as numbers, symbols, polygons including circles, triangles, and quadrangles, and stars are used. , A pattern, a mark, or the like, or an image like a photograph.

FIG. 9 shows the configuration of the printed image (3). The printed image (3) has a scabbard element group (4) and a latent image element group (7), and the latent image element group (7) is a first latent image element group (7A) and a second latent image element group (7A). The provision of the latent image element group (7B) of the above is the same as that of the first embodiment, but the difference from the first embodiment is that the visible image (10) is further provided in addition to the above configuration. It has a visible image element group (11) to be represented.

Hereinafter, the visible image element group (11) will be described in detail. FIG. 10A is a printed image (3) including a visible image element group (11), and FIGS. 10 (b1, b2, b3) and 11 (b4, b5, b6) are printed images (3). ) Is a partially enlarged view. In addition, FIGS. 10 (c1, c2, c3) and 11 (c4, c5, c6) are shown in the lines BB'of FIGS. 10 (b1, b2, b3) and 11 (b4, b5, b6). A cross-sectional view is shown.

As shown in FIG. 10 (b1, c1), the visible image element (12) may be laminated on the latent image element (8) at the same pitch as the latent image element (8) and with the same image width. Then, as shown in FIG. 10 (b2, c2), the latent image element (8) may be laminated on the latent image element (8) at the same pitch as the latent image element (8) and with a different width. Further, as shown in FIGS. 10 (b3, c3), the latent image element (8) on the semi-cylindrical element (5) is formed without the latent image element (8), and the visible image element (12) is formed at the omitted portion of the latent image element (8). May be formed. Further, as shown in FIGS. 11 (b4, c4), the visible image element (12) may be formed not on the latent image element (8) but on the semi-cylindrical element (5) or between the semi-cylindrical elements. good. The arrangement of the visible image element (12) may be the same as the angular difference of the latent image element (8) with respect to the semi-cylindrical element (5), and as shown in FIG. 11 (b5, c5), the latent image element (12) may be arranged. It may be different from the angle difference of the image element (8). Further, as shown in FIGS. 11 (b6, c6), the arrangement of the visible image element (12) may be formed on the semi-cylindrical element (5), between the semi-cylindrical elements, and on the latent image element (8). That is, the visible image element (12) can arbitrarily form the image line width and the pitch. As described above, the visible image element group (11) may be provided with a visible image different from the moire pattern or the latent image under the diffuse reflection light.

Next, the characteristics of the visible image element group (11) will be described. The visible image element group (11) is an image that is visually recognized under diffuse reflection light and normal reflection light in the visible light region, and is irradiated with light of a specific wavelength band or observed with light of a specific wavelength band. It has a feature that it cannot be visually recognized when it is used. Therefore, although the visible image element group (11) has an object color so that it can be visually recognized in the visible light region, it does not emit light by light in a specific wavelength band used for making a latent image image appear, or it does not emit light in a specific wavelength band. It is characterized by not absorbing the light of.

For example, when infrared rays are used as light in a specific wavelength band, one of the first latent image element group (7A) and the second latent image element group (7B) is a pigment that absorbs infrared rays, and the other is infrared rays. Although it is composed of a pigment that does not absorb infrared rays, the visible image element group (11) can be formed of a latent image printed matter (1) by being composed of a pigment that has an object color and does not absorb infrared rays.

In the embodiment, the visible image element group (11) has been described as an example composed of a set of straight lines, but the visible image element group (11) in the present invention is not limited to this, and is a curve. It may be composed of a dividing line or a dividing line, or it may be in a pixel form.

The visible image element group (11) includes an offset printing method, a flexographic printing method, and the like capable of printing at a relatively high resolution, similar to the formation of the latent image element group (7) by printing in the first embodiment. In addition to being suitable, it can also be formed using a digital printing machine such as an inkjet printer or a laser printer. By using these digital printing machines, different information can be given to each printed matter even for the visible image (10), and variable information can be easily given.

(effect)
Subsequently, the effect of the latent image printed matter (1) in the second embodiment will be described with reference to FIG. As shown in FIG. 12A, when light is incident on the latent image printed matter (1) and the observer (14) observes the latent image printed matter (1) under diffuse reflection light, the printed image (3) , The characters of "Insatsu Hanako" which is a visible image (10) are visually recognized. On the other hand, when the observer (14) observes the latent image printed matter (1) under the specular reflection light as shown in FIG. 12 (b), the visible image (10) cannot be visually recognized in the background until then. The moire pattern appears, and the moare pattern appears to move by changing the observation angle. Furthermore, when observing in light of a specific wavelength band, the observer (14) cannot see the characters "Insatsu Hanako" which is a visible image (10), and cannot see them under diffuse reflection light and specular reflection light. The latent image "AB1234567" is visually recognized. Specifically, when the specific wavelength in the second embodiment is infrared rays, as shown in FIG. 12 (c), when the latent image printed matter (1) is observed using the infrared camera (15). The latent image image "AB1234567" is visually recognized.

As described above, in the second embodiment of the present invention, the visible image is visually recognized under the diffuse reflection light and the specular reflection light, and a moire pattern that cannot be visually recognized under the diffuse reflection light appears, and the observation angle. By changing the above, a moving image effect of a moire pattern is generated, and by observing with light of a specific wavelength band, a latent image can be visually recognized, which can have three effects depending on the change of the observing condition.

Hereinafter, examples of the latent image printed matter specifically produced will be described in detail according to the embodiment for carrying out the above-mentioned invention, but the present invention is not limited to this embodiment.

(Example)
An embodiment will be described with reference to the example of the latent image printed matter (1) described in the second embodiment. Specifically, it will be described with reference to FIGS. 8 to 12. FIG. 8 shows a latent image printed matter (1) of the example. The latent image printed matter (1) comprises a printed image (3) having a visible image (10) on a substrate (2). As the base material (2), general coated paper (manufactured by Gladios CC Nippon Paper Industries) was used.

FIG. 9 shows an outline of the printed image (3). In the printed image (3), the latent image element group (7) is superimposed on the semi-cylindrical element group (4). The latent image element group (7) includes a first latent image element group (7A) and a second latent image element group (7B), and the latent image image represented by the first latent image element group (7A) is "AB1234567". ". Further, the printed image (3) further includes a visible image (10) constituting the characters of "Insatsu Hanako".

(printing)
In the Kamaboko-shaped element group (4), a plurality of straight Kamaboko-shaped elements (5) having a width of 0.3 mm are continuously arranged in a first direction (S1 direction) orthogonal to the straight line direction at a pitch of 0.4 mm. Become. The Kamaboko-shaped element group (4) having such an image composition is screen-printed by a UV drying method on a substrate (2) using a transparent screen ink (UV TUB-000 manufactured by Teikoku Inks Manufacturing Co., Ltd.). I printed it. The height of each semi-cylindrical element (5) was about 15 μm.

The latent image element group (7) was formed using a printer (manufactured by IPSIO RICOH). In the formation, only the first latent image element group (7A) is formed with black ink having an infrared absorbing function, and the second latent image element group (7B) and the visible image element group (11) are "Insatsu Hanako". Was formed by superimposing cyan ink, magenta ink, and yellow ink, which are used as process color inks and do not have the ability to absorb infrared rays. The density of the first latent image element group (7A) and the second latent image element group (7B) were adjusted so as to appear the same black under visible light. Further, in the latent image element group (7), the latent image element (8) having an image width of 0.10 mm is tilted 3 degrees with respect to the semi-cylindrical element group (4), and the pitch is 0 in the first direction (S1 direction). It was constructed by continuously arranging it at 416 mm. Further, similarly to the latent image element group (7), the visible image element group (11) is also tilted 3 degrees with respect to the kamaboko element group (4) with an image width of 0.10 mm in the first direction (S1 direction). ) Sequentially arranged at a pitch of 0.416 mm.

The effect of the latent image printed matter (1) of the example will be described with reference to FIG. First, as shown in FIG. 12A, when light is incident on the latent image printed matter (1) and the observer (14) observes the latent image printed matter (1) under diffuse reflection light, the visible image (10) The word "Insatsu Hanako" was visually recognized in black. Next, as shown in FIG. 12 (b1), when the observer (14) observed the latent image printed matter (1) under regular reflection light, it could not be visually recognized under diffuse reflection light together with the visible image (10). A moire pattern appeared, and as shown in FIG. 12 (b2), the moire pattern moved and was visually recognizable by changing the observation angle of the latent image printed matter (1). Further, as shown in FIG. 12 (c), when the latent image printed matter (1) is observed using an infrared camera (15) with a specific wavelength as infrared rays, the visible image (10) and the second latent image element group are observed. (7B) became invisible, and the characters "AB1234567", which is a latent image, could be visually recognized.

1 Latent image printed matter 2 Base material 3 Printed image 4 Latent image element group 5 Latent image element 6 Latent image image 7 Latent image element group 7A First latent image element group 7B Second latent image element group 8 Latent image element 9 Reflection Layer 10 Visible image 11 Visible image element group 12 Visible image element 13 Light source 14 Observer's viewpoint 15 Measuring instrument (camera, etc.)

Claims (4)

A printed image in which a kamaboko-shaped element group and a latent image element group are sequentially laminated is provided on at least a part of the base material.
The Kamaboko-shaped element group has at least one of light and dark flip-flop or color flip-flop optical characteristics, and is composed of regularly arranged Kamaboko-shaped elements having ridges.
The latent image element group is composed of latent image elements having different colors under specular reflection light from the kamaboko-shaped element group, which are regularly arranged with at least one of the pitch and the angle different from the kamaboko-shaped element.
The latent image element group has the same color under visible light, and is divided into a first latent image element group and a second latent image element group having different absorption characteristics or emission characteristics in light of a specific wavelength band. Image image is formed,
When observed under specularly reflected light, the moire pattern is visually recognized, and when the observation angle of the printed image is changed, the moire pattern moves and is visually recognized.
A latent image printed matter characterized in that the moire pattern disappears when observed by irradiating light in the specific wavelength band, and the latent image image is visually recognized. At least a part of the printed image is further provided with a visible image element group that forms a visible image that can be visually recognized under diffuse reflection light, and the visible image element group has light absorption characteristics or emission characteristics of the specific wavelength band. The latent image printed matter according to claim 1, wherein the latent image is not printed. The specific wavelength band is infrared rays, one of the first latent image element group and the second latent image element group is formed of black ink having infrared absorption characteristics, and the other does not have infrared absorption characteristics. The latent image printed matter according to claim 1 or 2, characterized in that it is formed of cyan, magenta, or yellow ink. The latent image printed matter according to any one of claims 1 to 3, wherein a reflective layer having a property of reflecting light is laminated between the kamaboko-shaped element group and the latent image element group. ..

Images