JP6948030B2 - Color change printed matter - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is a color whose color changes under specular light in the fields of banknotes, passports, securities, identification cards, cards, toll tickets, etc., which are security printed matter requiring an anti-counterfeiting effect. Regarding change printed matter.

In recent years, security printed matter has been difficult to forge because the effect of changing images in which multiple images are switched, the effect of moving images, and the effect of changing colors in which colors change continuously are easily noticeable and difficult to forge. It tends to be often used as an authenticity discrimination element. A typical technique having these effects is a hologram, which is widely used by being attached to security printed matter such as banknotes and passports, which require the highest security.

However, although the hologram is an excellent anti-counterfeiting technique, it requires a dedicated device for its fabrication, and it takes time and cost as compared with the anti-counterfeiting technique that can be produced by printing. Therefore, the applicant is recognized by the human eye at a specific part in the printed matter at a specific observation angle under specular light while using general and relatively inexpensive materials and simple printing means. We have already applied for an invention related to an optical change technique in which information is changed to completely different information like a hologram by changing the observation angle under specularly reflected light, or the appearing image appears to move. (See, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

Japanese Unexamined Patent Publication No. 2016-203458 Japanese Unexamined Patent Publication No. 2016-55480 Japanese Unexamined Patent Publication No. 2016-107467 Japanese Unexamined Patent Publication No. 2017-144558

In each of the conventional techniques from Patent Document 1 to Patent Document 4, an image formed by arranging a plurality of scab-like elements having swelling swelling on a reflective layer having specific optical characteristics is superimposed, and further latent. It is a technique of laminating a latent image image including a plurality of images formed by arranging image elements on an upper layer or a lower layer of a gauze-shaped element, and is a technique for forming a plurality of images included in the latent image image under normal reflection light. Is a technology that realizes effects such as changing to a different image by changing the observation angle, moving the appearing image, and changing the color.

However, although the techniques of Patent Documents 1 to 3 have a configuration in which a latent image or pattern having a unique effect and rich color appears at the time of authenticity discrimination under specular reflection light, it is usually under diffuse reflection light. In the observation state of, in many cases, the latent image and the image line group constituting the pattern appearing at the time of authenticity discrimination are visually recognized as they are, so that the image is recognized as an unclear image. As described above, there is a problem that the design of an image that can be visually recognized under diffuse reflection light is poor.

The technique of Patent Document 4 has a so-called image change effect in which a visible image different from a latent image can be visually recognized under normal observation under diffuse reflection light, and the visible image disappears and a latent image appears under regular reflection light. It is a technique that solves the problem of designability possessed by the above-mentioned Patent Documents 1 to 3 by giving it. However, in the technique of Patent Document 4, the visible image plays only a role of forming an image that can be visually recognized under diffuse reflection light, and the latent image or pattern that appears under specular reflection light is in a layer different from that of the visible image. It had to be formed using a different ink. In this case, four steps are required, starting from the visible image printing process, then attaching the reflective layer, then printing the latent image pattern, and finally forming the kamaboko-shaped element group by screen printing, which increases the cost. In many cases.

An object of the present invention is to solve the above-mentioned problems. In the anti-counterfeiting technique having a reflective layer, a visible image can be observed under diffuse reflection light, and an image configuration of the visible image under specular reflection light. It is a technology with an image change effect that produces colorful moving color moire derived from the above, and is characterized by being able to be manufactured in a simpler process than before.

In the present invention, at least a part of the substrate is provided with a color change region, and the color change region is formed on a reflective layer having at least one of light and dark flip-flop properties and color flip-flop properties. The shape element group and the visible image element group are overlapped with either one facing up. The visible image element group is composed of the first to nth (n is an integer of 2 or more) color elements having different colors, and is composed of the first to nth (n is an integer of 2 or more). Each of the color elements 1 to n has at least two element widths in one color element, and is arranged alternately along the first direction at the second pitch, thereby shading. A visible image of significant information is formed by, and the first to nth color elements differ from each other in at least one of the element width, direction, and pitch with respect to the gem-shaped element, and the color change region is visible under diffuse reflection light. The image can be visually recognized, and at a specific observation angle under normal reflection light, the visible image disappears and a color moire represented by the first to nth colors appears, and the observation is different from the specific observation angle. It is a color-changing printed matter characterized in that the color moire moves and is visually recognized when the angle is changed.

Further, the color-changing printed matter of the present invention is characterized in that the ratio of at least two element widths is 1.05 or more and 3.0 or less.

Further, the color change printed matter of the present invention further includes a latent image element group, and the latent image element group has a color different from that of the reflection layer under specular reflected light, and is formed by compressing and / or dividing the base image. It is characterized in that a latent image is formed by arranging the latent image elements at the same or different pitches as the first pitch.

Further, in the color change printed matter of the present invention, the brightness and / or saturation of the reflective layer under specular reflection light is 400 or more, and the half-value width of the reflection angle with respect to the incident angle of the light of brightness and / or saturation is It is characterized by being less than 20 °.

In the color change printed matter of the present invention, the visible image visually recognized under diffuse reflection light disappears under normal reflection light, and the color elements constituting the visible image appear as colorful color moire. Has an excellent change effect. Since the visible image can form significant information by shading, it is not recognized as an unclear image under diffuse reflection light as in the prior art.

The visible image of the color-changing printed matter of the present invention represents significant information under diffuse reflection light and plays two roles of becoming color moire under specular reflection light. Therefore, it is not necessary to separately configure the visible image and the latent image element group (corresponding to the color element group of the present invention) as in the prior art. Therefore, the manufacturing process is not as complicated as that of the conventional technique, and the cost performance is excellent.

The color-changing printed matter of the present invention can be formed with a thickness of 1/10 or less as compared with a general technique for changing an image by using a lens effect such as a lenticular or a microlens array. In addition, unlike holograms, it does not require a dedicated manufacturing device or machine, and can be manufactured by using paper as a base material, using a general pasting device, printing ink, and an existing printing machine. Excellent cost performance.

(A) shows the front view of the color change printed matter in this invention, and (b) shows the side view. The outline of the basic structure of the color change printed matter in this invention is shown. The Kamaboko-like element group in the present invention is shown. The group of visible image elements in the present invention is shown. The layer structure in the present invention is shown. The effect of the color change printed matter in the present invention is shown. The latent image element group in the present invention is shown. An example of the layer structure of the color change printed matter in the present invention is shown. The effect of the color change printed matter in the present invention is shown. An example of the optical characteristics of the reflective layer in 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.

(First Embodiment)
FIG. 1 shows a color-changing printed matter (1) according to the present invention. FIG. 1A is a front view of the color-changing printed matter (1), and FIG. 1B is a cross-sectional view of the color-changing printed matter (1) on the AA'line. The color change printed matter (1) is formed by forming a color change region (3) on the base material (2). The base material (2) may be made of any material provided that the reflective layer (4) can be attached. It may be paper, plastic, metal, glass or the like. Further, as long as it is paper, it may be high-quality paper, coated paper, or art paper. The color change region (3) may be any color other than transparent. Further, the size of the base material (2) is not particularly limited.

FIG. 2 shows an outline of the configuration of the color change region (3) of the present invention. The color change region (3) includes at least a reflective layer (4), a semi-cylindrical element group (5), and a visible image element group (6). The reflective layer (4) has a property of strongly reflecting light, and needs to be attached on the base material (2) and in close contact with the base material (2). The Kamaboko-shaped element group (5) is composed of a set of elements having ridges, and is mainly formed by printing. The visible image element group (6) is a color element that is a source of color moiré that appears under specular light, and is mainly formed by printing like the Kamaboko-shaped element group (5). Subsequently, the reflective layer (4), the semi-cylindrical element group (5), and the visible image element group (6) will be specifically described.

First, the reflective layer (4) will be described. The shape of the reflective layer (4) can be any shape. Further, the reflective layer (4) has at least one optical characteristic of so-called light-dark flip-flop property in which light is strongly reflected during specular reflection to increase the brightness, or so-called color flip-flop property in which the hue changes during specular reflection. Must be prepared. The light-dark flip-flop property is provided by metal foil, transparent film or metal film, metal tape, resin, plastic, or the like. Further, it can be formed with colored ink or transparent ink as long as it can satisfy the optical characteristics described later.

On the other hand, as a material having a color flip-flop property, there are an interference film, a hologram film and the like. If it is a printing ink, it can also be formed by printing using pearl ink, OVI (Optical Variable INK), or the like. For example, an interference film is colorless and transparent under diffusely reflected light, but emits a specific interference color under specularly reflected light. As described above, the hue itself of the reflective layer (4) having the color flip-flop property changes under the specular reflection light. Further, it is preferable that the reflective layer (4) has an optical characteristic of reflecting light only in an extremely narrow angle range in the vicinity of the same angle in the direction opposite to the angle of the incident light without diffusing the light.

More specifically, the optical characteristics required for the reflective layer (4) will be described. If the maximum brightness and / or maximum saturation of the reflective layer (4) at the time of specular reflection is 400 or more, the incident light is sufficiently taken. It is preferable because it can be reflected in. Further, when the incident angle of light is fixed and the light receiving angle is changed, the half-value width (FWHM: full Wide at half maximum) of the lightness and / or saturation of the reflective layer (4) is more preferably less than 20 °. Can reflect incident light to the opposite side without widening the angle too much if it is less than 10 °.

Next, the Kamaboko-shaped element group (5) will be described. Further, the kamaboko-shaped element group (5) can also have an arbitrary shape like the reflective layer (4). The Kamaboko-shaped element group (5) needs to have light transmission. This is because the incident light must pass through the semi-cylindrical element group (5) and reach the reflective layer (4). As long as it has light transmission, it may be colored with a specific color. However, the light incident on the reflective layer (4) is the strongest, and the visibility of the latent image is the highest when the Kamaboko-shaped element group (5) is transparent. Therefore, consider the balance between the color design and the effect. Need to be designed.

FIG. 3 shows an example of the configuration of the Kamaboko-shaped element group (5). In the kamaboko-shaped element group (5), the kamaboko-shaped element (7) having a specific first element width (W1) of the kamaboko shape having a bulge is in the first direction (P1) at a specific first pitch (P1). It is regularly arranged in the S1 direction). The semi-cylindrical element (7) in the first embodiment has a semi-cylindrical shape and has a semi-cylindrical cross section, but is not limited to this shape. The shape of the semi-cylindrical element (7) is not limited to the image line, and may be a pixel. More specifically, any shape may be used as long as it has a three-dimensional curved surface shape, that is, a structure having a bulge and is symmetrical with respect to at least the first direction (S1 direction). .. It has not only circular pixels with bulges, but also symmetrical shapes with a certain curvature such as semi-elliptical spheres and stalks, and three-dimensional curved surface shapes such as polygonal pillars such as triangular pillars, pentagonal pillars, and hexagonal pillars. , The plane shape may be a shape having a curved surface such as a circular shape or an elliptical shape, or a polygonal shape such as a triangle, a pentagon, or a hexagon.

The Kamaboko-shaped element group (5) having the above configuration is formed by a printing method capable of forming a swell. In order to ensure a certain level of visibility for the latent image appearing under normal reflected light, the height of the bulge of the gravure element (7) must be at least 3 μm or more, so screen printing, intaglio printing, etc. However, even in gravure printing, flexographic printing, letterpress printing, IJP, etc., it is possible to form a height of swelling of the image line to this extent. The upper limit of the height of the swelling is not particularly limited, but it is set to 1 mm or less in consideration of stability, abrasion resistance, distribution suitability, etc. when a large amount of load is loaded. The above is the explanation of the Kamaboko-shaped element group (5).

Subsequently, the visible image element group (6) will be described. FIG. 4 shows an example of the configuration of the visible image element group (6). The visible image element group (6) is composed of at least two or more color element groups. In the example of the first embodiment, the visible image element group (6) is described using a form composed of two color element groups, a first color element group (6G) and a second color element group (6R). do.

In the first color element group (6G), the first color element (8G) of the first color of the second element width (W2) and the third element width (W3) is the second pitch (P2). Is continuously arranged in the first direction (S1 direction). In the second color element group (6R), the second color element (8R) of the second color of the fourth element width (W4) and the fifth element width (W5) is the second pitch (P2). Is continuously arranged in the first direction (S1 direction). In the first embodiment, the first color is green and the second color is red.

The second element width (W2) and the third element width (W3) need to be different, and similarly the fourth element width (W4) and the fifth element width (W5) need to be different. There is. The ratio of the second element width (W2) to the third element width (W3) and the ratio of the fourth element width (W4) to the fifth element width (W5) are almost the same. Since the shade of the visible image composed of the visible image element group (6) is determined by the height of this ratio, it is necessary to increase this ratio if it is desired to increase the shade difference of the visible image to obtain a clear image. There is. However, the range of the ratio of the second element width (W2) and the third element width (W3) and the ratio of the fourth element width (W4) and the fifth element width (W5) is 1.05 or more and 3 Must be 0.0 or less. It depends on which color is applied to the first color and the second color, but no matter what color is used, if this ratio is less than 1.05, the shade difference cannot be recognized and the visible image element. The visible image composed of the group (6) becomes unclear. On the other hand, if it is larger than 3.0, no matter what color is used, the shade of the visible image is not completely eliminated under the specular reflection light, and there arises a problem that the visible image overlaps with the color moire.

It is preferable that the second pitch (P2) of each of the first color element group (6G) and the second color element group (6R) constituting the visible image element group (6) is the same. Although it is possible to form them at different pitches, in that case, the first color element group (6G) and the second color element group (6R) interfere with each other to generate unnecessary shades under diffuse reflection light. Therefore, it is not a preferable configuration.

Further, the second pitch (P2) of each of the first color element group (6G) and the second color element group (6R) is different from the first pitch (P1) of the stalk-shaped element group (5). And / or the shape of the first color element (8G) constituting the first color element group (6G) and the shape of the second color element (8R) constituting the second color element group (6R). It is necessary that the shapes of the stalk-shaped elements (7) constituting the stalk-shaped element group (5) are different from each other. This is a necessary condition for causing moire under specularly reflected light.

In the example of the first embodiment, the second pitch (P2) of each of the first color element group (6G) and the second color element group (6R) is a semi-cylindrical element group (5). The shape of the first color element (8G) and the second color element (8R) is a wavy line that is slightly undulating to the extent that it cannot be seen. It should be noted that the difference in shape includes not only the difference in shape but also the difference in angle and the difference in size.

Moire occurs when the shape of each color element (8), the shape of the semi-cylindrical element group (5), and the pitches of each other interfere with each other, so it is important to design each shape and pitch. In the example of the first embodiment, the configuration is such that moiré of extremely simple wavy lines is generated, but moiré of a more complicated shape can also be generated. Specifically, by using the image line configuration described in Japanese Patent No. 5131789, characters, patterns and the like can appear as moire.

Further, the second pitch (P2) of each of the first color element group (6G) and the second color element group (6R) and the first pitch (P1) of the kamaboko-shaped element group (5) are It is preferably different within the range of 80% to 120%. This is a condition necessary for the color moiré that appears under specular light to have a configuration in which the first color and the second color can be clearly seen in a single color, and is latent when viewed at an angle. This is a necessary condition for easily recognizing the effect that the image appears to move.

Further, if the observer does not recognize that the visible image element group (6) is composed of a plurality of color elements (8), the impact when the color moire appears will be larger, so that the first color element The pitch of the group (6G) and the second color element group (6R) is preferably 1 mm or less.

When the colors of the first color element (8G) and the second color element (8R) are in a complementary color relationship, the visible image recognized as an achromatic color such as gray or black under diffuse reflection light is positive. It is more preferable because it is colored with a completely different chromatic color under reflected light and can have a great impact on the observer. So far, the configuration of the visible image element group (6) when designed with n = 2 (n is an integer of 2 or more in the number of color elements) has been described.

Even when n = 2 or more, the first color, the second color, ... The nth color need to be different, and it is more preferable that the hues are different. This is because the appearing color moiré reflects all of the first color, the second color, ... the nth color. In addition, when n = 3, if cyan, yellow, and magenta are used, the color moire that appears under specular reflection light can be expressed in a colorful rainbow color while it looks achromatic under diffuse reflection light. It is possible and more preferable. When n = 4, it is possible to express color moiré in full color by using cyan, yellow, magenta, and black.

Unlike the Kamaboko-shaped element group (5), each color element (8) does not need a height, so that the visible image element group (6) can be formed by offset printing. It may be formed by flexographic printing, gravure printing, letterpress printing, intaglio printing, screen printing or the like according to the equipment seeds of the producer, or may be formed by a printer such as an inkjet or a laser. When it is formed by a printer, variable printing in which the information on each sheet is different is possible, and a higher effect can be obtained. The above is the description of the visible image element group (6).

FIG. 5 shows the stacking order of the reflective layer (4), the semi-cylindrical element group (5), and the visible image element group (6). Of the three elements of the reflective layer (4), the semi-cylindrical element group (5), and the visible image element group (6), the reflective layer (4) needs to be arranged in the layer closest to the base material (2). .. The Kamaboko-shaped element group (5) and the visible image element group (6) need to be overlapped on the reflective layer (4), but which of the Kamaboko-shaped element group (5) and the visible image element group (6) is on top. It doesn't matter whether it is below or below. The color-changing printed matter (1) of the present invention can be formed in any stacking order.

Subsequently, FIG. 6 shows the effect of the color-changing printed matter (1) of the present invention. As shown in FIG. 6A, when the color change printed matter (1) of the present invention is observed under diffused reflected light, the color change region (3) is visible represented by the visible image element group (6). The image is visible. In the first embodiment, a visible image representing an image of cherry blossom running water is represented by shades of gray, which is a composite color of green and red. As shown in FIG. 6B, when the color-changing printed matter (1) of the present invention is observed under specular reflected light, it is observed at a specific observation angle (in the first embodiment, a slightly shallow observation angle). , The visible image disappears, and the color moire colored by the green wave pattern (11G) which is the first color and the red wave pattern (11R) which is the second color is in the color change region (3). Appear. As shown in FIG. 6 (c), at a specific observation angle under specularly reflected light (a slightly deeper observation angle in the first embodiment), which is different from the case of FIG. 6 (b), FIG. 6 ( The color moire moves in the color change region (3) to a position different from the position that appeared in b). The movement of the color moiré from FIG. 6 (b) to FIG. 6 (c) is a continuous change, and the position of the color moiré in the color change region (3) changes according to the tilt angle.

The principle of producing such a moving image is as described in JP-A-2016-203458 when the color-changing printed matter (1) is composed of the layer structure shown in FIG. 5 (a). The case where the color-changing printed matter (1) is composed of the layer structure shown in FIG. 5 (b) is as described in Japanese Patent Application Laid-Open No. 2016-55480. The above is the description of the effect of the present invention.

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 of hue, lightness, and saturation. Or, it means that their combination is different. Further, the color difference in the present invention is 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 *, respectively. It can be calculated by adding the square and taking the square root.

The term "normal reflection" as used herein 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. It refers to a phenomenon in which weak reflected light is generated at an angle different from the angle of incident light when light is incident on the substance at an incident angle. Observing under specular reflection refers to the state of observing from a viewpoint at a reflection angle that is almost equal to the angle of light incident on the printed matter, and observing under diffuse reflection light means that the angle of light incident on the printed matter is large. Refers to the state of observing from different angles.

(Second embodiment)
Subsequently, as a second embodiment, an example in which the color-changing printed matter (1) of the present invention is shown more effectively will be described. In the second embodiment, in addition to the effect of the appearance of color moiré as in the first embodiment, a form in which a moving latent image of a cherry blossom pattern appears at the same time will be described. This is an example in which a color moire, which is responsible for color expression, and a latent image, which is represented by the intensity of clear light, appear in an overlapping manner to give a stronger impact effect.

For the configurations up to the reflective layer (4), the semi-cylindrical element group (5), and the visible image element group (6), the configuration of the color-changing printed matter (1) described in the first embodiment is used. In the second embodiment, the latent image element group (12) shown in FIG. 7 is added in addition to these. The latent image element group (12) shown in FIG. 7 will be described as an example created by the method described in Japanese Patent No. 5200284. However, the configuration of the latent image element group (12) in the present invention is shown in FIG. The configuration of the other latent image element group (12) is not limited to the example shown in the above, and will be described later.

The latent image element group (12) shown in FIG. 7 is a specific element created by cutting out a base image (14) intended to appear as a latent image with a specific width and compressing it in the vertical direction at a constant compression rate. Latent image elements (13) having a width (W6) are continuously arranged in a first direction (S1) at a first pitch (P1). As a specific production method, the method described in Japanese Patent No. 5200284 may be used. The latent image element group (12) is superposed on the reflective layer (4) to prepare a color-changing printed matter (1). Although it has a first pitch (P1) in FIG. 7, it may be formed at a pitch different from the first pitch (P1) depending on the form of the latent image element group to be formed. When formed at different pitches, the dynamic effect of moire due to the difference in pitch between the latent image element group (12) and the semi-cylindrical element group (5) is exhibited.

The latent image element group (12) can be formed by offset printing in the same manner as the visible image element group (6). Similar to the visible image element group (6), it may be formed by flexographic printing, gravure printing, letterpress printing, intaglio printing, screen printing, etc. according to the equipment seeds of the producer, and may be formed by inkjet, laser, etc. There is no problem even if it is formed by a printer. When it is formed by a printer, variable printing in which the information on each sheet is different is possible, and a higher effect can be obtained.

The latent image element group (12) may be formed with a specific colored ink, but it is necessary to use as light an ink as possible because it mixes with the visible image represented by the visible image element group (6). Preferably, the color may be the same as that of the underlying reflective layer (4) or the base material (2), or may be formed colorless and transparent or translucent. When forming with transparent or translucent ink, in order to facilitate quality control, a slight amount of coloring pigment is added to color the ink, or a transparent ink is mixed with a fluorescent pigment and deprinted using a UV lamp. It is also possible to manage abnormalities such as printing defects and printing defects.

In order to visualize a part of the information in the visible image element group (6) under specular reflection light, the latent image element group (12) needs to generate a color difference from the reflection layer (4) at the time of specular reflection. Yes, at least the color at the time of specular reflection needs to be different from the color at the time of specular reflection of the above-mentioned reflection layer (4). Further, when it is desired to further improve the visibility of the latent image image, a high light blocking property may be imparted to the latent image element group (12). A higher effect can be obtained by blending a functional material having a high light blocking property such as titanium dioxide or aluminum oxide with the printing ink for printing the latent image element group (12).

FIG. 8 shows the stacking order of each layer including the latent image element group (12). Since the latent image element group (12) can be formed by the offset printing method in the same manner as the visible image element group (6), the latent image element group (12) is referred to as the visible image element group (6) as shown in FIG. If it is formed at the same time as printing, there is no need to increase the number of steps, and the effect on cost is small. In both FIGS. 8 (a) and 8 (b), the latent image element group (12) is superimposed on the visible image element group (6), but the present invention is not limited to this. A configuration in which the visible image element group (6) is superimposed on the latent image element group (12) may be used. In any case, it is preferable to form the latent image element group (12) and the visible image element group (6) at the same time in a single step.

FIG. 9 shows the effect of the color change printed matter (1) of the second embodiment. As shown in FIG. 9A, when the color change printed matter (1) of the present invention is observed under diffuse reflection light, the color change region (3) is visible represented by the visible image element group (6). The image is visible in shades of gray. As shown in FIG. 9B, when the color-changing printed matter (1) of the present invention is observed under specular reflected light, it is observed at a specific observation angle (in the second embodiment, a slightly shallow observation angle). , The visible image disappears, and the color moire colored by the green wave pattern (11G) which is the first color and the red wave pattern (11R) which is the second color, and the latent image element group (12). A latent image (15) of cherry blossom petals produced from the above appears in the color change area (3). The latent image (15) is visible in dark black, which is less bright than the surrounding moire. As shown in FIG. 9 (c), at a specific observation angle under specularly reflected light (a slightly deeper observation angle in the second embodiment), which is different from the case of FIG. 9 (b), FIG. 9 ( The latent image (15) and the color moire move in the color change region (3) to a position different from the position appearing in b). The movement of the color moiré and the latent image (15) from FIG. 9 (b) to FIG. 9 (c) is a continuous change, and the latent image (15) in the color change region (3) is changed according to the tilt angle. And the position of the color moiré changes.

Further, in the second embodiment, the configuration in which the moving image effect of the latent image (15) is generated has been described, but the configuration in which the latent image (15) is changed from one image to a completely different image is also used. good. In that case, the method described in Japanese Patent No. 4682283 may be used. Further, as for the composition and production method of the latent image element group (12) that produces the moving image effect by utilizing the phenomenon called the moire enlargement phenomenon, the methods described in Japanese Patent No. 4844894 and Japanese Patent No. 5131789 may be used. .. Further, regarding the configuration when the kamaboko-shaped element (7) and the latent image element (13) are pixels instead of strokes, Japanese Patent No. 4660775, Japanese Patent No. 4682283, Japanese Patent No. 5200284, Japanese Patent No. 6075244 The configurations described in Japanese Patent No. 612802 and Japanese Patent No. 612882 may be used. Further, when the semi-cylindrical element (7) and the latent image element (13) are formed by a curved line instead of a straight line, the configurations of Japanese Patent No. 6032423 and Japanese Patent No. 6112357 may be used. Further, if more special effects are to be realized, JP-A-2016-203459, JP-A-2016-210149, JP-A-2016-221889, JP-A-2017-56577 and the like may be used. .. As described above, the composition of the Kamaboko-shaped element group (5) and the latent image element group (12) is not limited, and the latent image element group (12) is placed on the conventional Kamaboko-shaped element (5). The configuration used in the technique for expressing a latent image by superimposing the above can be used as it is.

Hereinafter, examples of the color-changing printed matter (1) specifically produced according to the embodiment for carrying out the above-mentioned invention will be described in detail with reference to FIGS. 1 to 9, but the present invention describes this embodiment. It is not limited to the example.

The color change printed matter (1) will be described below. As the base material (2), general white coated paper (manufactured by Esprit Coat FM Nippon Paper Industries Co., Ltd.) was used. A plain aluminum film was attached as a reflective layer (4) on the base material (2). This aluminum film is transparent under diffuse reflected light, but emits extremely strong reflected light under specular reflected light, and has a particularly excellent light-dark flip-flop property in which the brightness changes significantly.

The brightness of the reflective layer (4) was measured using a variable angle spectrophotometer (GCMS-4, manufactured by Murakami Color Technology Laboratory Co., Ltd.). A graph of brightness is shown in FIG. The measurement conditions were fixed at a D65 light source, a 10-degree field of view, and an incident angle of 45 °, and the spectral reflectance in the visible light region was measured with the light receiving angle in the range of 0 ° to 80 °. From the above, the brightness (L *) and saturation (C * ab) of normal reflection were calculated based on the L * a * b * color system. The lightness (L *) of specular reflection at a light receiving angle of 45 ° was 1,200, the saturation (C * ab) was 69, and the half width was about 10 °.

In the Kamaboko-shaped element group (5) shown in FIG. 3, the Kamaboko-shaped element (7) having an element height of 15 μm and a first element width of 0.3 mm has a first pitch of 0.4 mm in the vertical direction. Arranged continuously. The semi-cylindrical element (7) is formed on the reflective layer (4) attached on the base material (2) by a UV screen printing method using a transparent UV screen ink (UVA9117, Seiko Advance Co., Ltd.). bottom.

The visible image element group (6) shown in FIG. 4 has a green first color element (8G) having a second element width (W2) = 0.09 mm and a third element width (W3) = 0.18 mm. The first color element group (6G) arranged continuously in the vertical direction with a second pitch (P2) of 0.412 mm, the fourth element width (W4) = 0.09 mm, and the fifth element width (W5). ) = A second color element group (6R) in which a red second color element (8R) of 0.18 mm is arranged continuously in the vertical direction at a second pitch (P2) of 0.412 mm is provided by each other. They were arranged alternately so that they would not overlap. The specific configuration of the Kamaboko-shaped element group (5) and the visible image element group (6) is the same as that of the first embodiment. The visible image element group (6) was printed with UV offset ink.

Further, the latent image element group (12) shown in FIG. 7 is a UV offset printing using a mixed ink in which about 10% of UV white ink containing titanium oxide is mixed with a transparent matte ink for UV offset. The visible image element group (6) was printed on the shape element group (5) and then formed to obtain a color-changing printed matter (1) of Example 1.

The effect of the color-changing printed matter (1) formed by the above configuration will be described with reference to FIG. When the color change printed matter (1) of the present invention is observed under diffuse reflection light, the latent image (15) is invisible and visible in the color change region (3) as shown in FIG. 9 (a). The image was visually recognized in gray, which is a composite color of green, which is the first color, and red, which is the second color. As shown in FIG. 9B, when the color-changing printed matter (1) of the present invention was observed at a specific angle under specularly reflected light, cherry blossom petals appeared as a latent image (15). The latent image (15) was black, and the other color change regions (3) were colored by the green pattern (11G), which is the first color, and the red pattern (11R), which is the second color. Color moire was visually recognized. Subsequently, as shown in FIG. 9 (c), when the color-changing printed matter (1) of the present invention is observed at different angles under regular reflection light, the position of the latent image (15) and the position of the color moire are continuous. It was confirmed that the video effect changed to.

1 Color change printed matter 2 Base material 3 Color change area 4 Reflective layer 5 Latent image element group 6, 6G, 6R Visible image element group 7 Latent image element 8, 8G, 8R Color element 9 Light source 10 Observer 11G, 11R Color moire 12 Latent image element group 13 Latent image element 14 Base image 15 Latent image W Element width P Pitch S1 First direction

Claims (3)

At least a part of the substrate has a color change area,
The color change region includes a reflective layer having a light-dark flop property and at least one of the optical properties of the color flip-flop property, on the reflective layer, the layer according to the layer and visible image element group according semicylindrical element group , Whichever is on top, overlaps,
The layer made of the kamaboko-shaped element group is formed by arranging the kamaboko-shaped elements having light transmission and swelling along the first direction at the first element width and the first pitch.
Layer by the visible image element group comprises at least two or more colors element group,
In the color element group, one of the color element groups has the same color, and the plurality of the color element groups are all composed of different colors.
In each of the color element groups, a plurality of color elements are arranged at a second pitch along the first direction, and the color elements having different colors are alternately arranged to form the color element group. The element width of at least one of the color elements is different within one of the color elements.
In the color change region, the reflective layer becomes colorless and transparent under diffuse reflection light, so that a visible image with a difference in shade due to a difference in the element width of the color element can be visually recognized.
At a specific observation angle under normal reflection light, the shade of the color element disappears due to the interference color emitted by the reflection layer, and color moire due to the interference between the hump-like element group and the color element group appears, and the color moire appears. A color-changing printed matter characterized in that when the observation angle changes from a specific observation angle to a different observation angle, the color moire moves and is visually recognized. The color-changing printed matter according to claim 1, wherein the ratio of the element widths in the same color element is 1.05 or more and 3.0 or less. The color-changing printed matter further includes a group of latent image elements.
The latent image element group has a color different from that of the reflective layer under specular light, and the latent image element formed by compressing and / or dividing the base image has the same or different pitch as the first pitch. The color-changing printed matter according to claim 1 or 2, wherein a latent image is formed by being arranged.

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