JP2017144558A - Latent image printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent image printed matter in which visibility of a latent image is improved and a visible image has an excellent expression of hue.SOLUTION: A meaningful information-variable image is formed on at least a part of a substrate. The meaningful information-variable image comprises the following layers: a visible image formed of a coloring material in a color different from that of the substrate; a light-reflection layer that has at least one optical characteristic of a bright-dark flip-flop property and a color flip-flop property, has at least one optical characteristic of a lightness L* of 400 or more in regular reflection and a saturation C*ab of 200 or more in regular reflection, and is transparent or translucent under diffusion reflection light; a semicylindrical element group composed of transparent or translucent semicylindrical elements arranged at a given pitch; and a latent image element group composed of a plurality of latent image elements arranged, in which the latent image element is transparent or translucent, shows a hue under regular reflection light different from the hue of the light-reflection layer under regular reflection light, and has a divided and/or compressed base image.SELECTED DRAWING: Figure 1

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matters that require an anti-counterfeit effect, the present invention provides images under specular reflection. The present invention relates to a changing latent image printed matter.

  In recent years, the effect of changing images that switch multiple images and the effect of moving images that appear to move are easily attracted to people and are difficult to forge. is there. A typical technique having these effects is a hologram, which is widely used by being affixed to a security printed matter requiring high security such as a banknote or a passport.

  On the other hand, in addition to holograms, there is already an authenticity determination element having a change effect in which a plurality of images are switched, as in known techniques such as a parallax barrier and lenticular.

  However, although holograms are used for various security printed materials such as banknotes, there are significant problems in the complexity of the manufacturing process and high manufacturing costs compared to general printed materials. Since the authenticity determination element using a parallax barrier or lenticular requires a clear layer or a lens, the base material is almost limited to plastic, and the printed material has a certain thickness (about 150 μm). It is necessary and cannot be used for printed matter with a limited thickness, and tends to be used only for plastic cards that allow a certain thickness.

  In order to solve the above-mentioned problems, a human eye at a specific part in a printed material is used at a specific observation angle under specular reflection light while using a general and relatively inexpensive material and simple printing means. The invention recognizes that the information recognized is changed to completely different information by changing the observation angle under specularly reflected light, and the invention relating to the optical change technique in which the image that appears appears to move (Patents have been filed) For example, see Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5.

Japanese Patent No. 4682283 Japanese Patent No. 4660775 Japanese Patent No. 4844894 Japanese Patent No. 5131789 Japanese Patent No. 5200284 JP 2014-136325 A

  In the conventional techniques from Patent Document 1 to Patent Document 5, a plurality of images formed by arranging latent image elements on an image formed by arranging a plurality of bowl-shaped elements each having a bowl-shaped swell. This is a technology that forms a group of latent image elements in a superimposed manner. The effect is that multiple images included in the latent image element group appear under specular reflection and change to different images by changing the observation angle. In addition, it is a technique having a moving image effect in which an appearing image appears to move. In these technologies, the amount of reflected light during regular reflection of the bowl-shaped element directly affects the visibility of the latent image as it is, and as a required optical characteristic of the bowl-shaped element, a large amount of reflected light is incident when light is incident. Therefore, a characteristic that produces light (a light / dark flip-flop property in which brightness changes during regular reflection or a color flip-flop property in which hue changes) is essential. In the prior art, as a method for obtaining these characteristics, special functional materials such as metal pigments and pearl pigments are blended in the ink constituting the cage-shaped element group.

  However, in the conventional technology, when forming a thick ridge-like element with swell with ink, even if a special functional material such as a metal pigment or a pearl pigment is blended in the ink, the obtained reflection There was a limit to the amount of light. For example, the limit value of the increase in brightness (light / dark flip-flop property) when a saddle-like element is formed using general ink distributed in the market is less than 350 at L *, and the saturation change C * ab (color flip-flop) ) Was less than 80. This is an extremely low value compared to the limit value of the amount of reflected light generated from metal, plastic, film, etc. itself. This is because there is a limit to the blending ratio of special functional materials that can be blended into the ink used for printing, and even when these functional materials are blended to the limit, the functional material is inside the bowl-shaped element that has a rise. One reason for this is that they are randomly oriented so that they cannot extract the reflected light. From the above, in the conventional techniques from Patent Document 1 to Patent Document 5, there is a limit to the amount of reflected light obtained from the saddle-shaped element, and the latent light with a higher amount of reflected light is improved to improve the visibility of the latent image. An image print was desired.

  On the other hand, in the prior art of Patent Document 1, by changing the width and diameter of the bowl-shaped element, a visible image visible under diffuse reflected light is formed separately from the latent image that appears under specular reflected light. It is described to do. It should be noted that it is possible to construct a visible image by changing the width and diameter of the bowl-shaped element in Patent Documents 2 to 4 having the same bowl-shaped element. Moreover, in the technique of patent document 6, it describes that the visible image visible under diffuse reflected light is formed with the information element arrange | positioned in the lower layer of the bowl-shaped elements. In such a form, a visible image can be visually recognized under diffuse reflection light, and the visible image disappears under regular reflection light, and a so-called latent image with no correlation appears. It was possible. This effect is due to the fact that a visible image composed of the saddle-shaped element itself or a visible image consisting of information elements arranged in the lower layer of the saddle-shaped element is visually recognized by reflected light generated by the saddle-shaped element under specular reflection light. Due to the disappearance. However, as described above, since the amount of reflected light of the bowl-shaped element is small in any technique, the range of shades of the visible image that can be lost under specular reflection light is extremely narrow, so the visibility of the visible image is high. A high latent image print was desired.

  Further, since the visible image formed by the prior art of Patent Document 1 is configured by the width and diameter of the bowl-shaped element, the color of the visible image is limited to the color of the bowl-shaped element, and the visible color of the color is limited. An image could not be formed. On the other hand, in the prior art of Patent Document 6, the hue of the information element is made different from the hue of the latent image element and the camouflage element to form a visible image having a color different from the color of the bowl-shaped element. Although it is possible, since the visible image disappears under specular reflection light, it is necessary to make the visible image lighter in color, and there is a problem that visibility of the visible image is lowered. Therefore, a latent image printed material having a rich color expression of a visible image has been desired.

  The present invention is intended to solve the above-described problems, and provides a latent image printed matter that improves the visibility of a latent image and is excellent in color expression of a visible image.

  The latent image printed matter of the present invention includes a significant information change image on at least a part of a substrate, and the significant information change image is formed on a visible image formed of a color material having a color different from that of the substrate, and on the visible image. And / or optical characteristics of at least one of light / dark flip-flop and color flip-flop and at least one of lightness L * at the time of specular reflection is 400 or more or chroma C * ab at the time of specular reflection is 200 or more A transparent or semi-transparent light reflecting layer is formed under diffuse reflected light, and a transparent or semi-transparent saddle-like element is arranged on the light reflecting layer at a constant pitch. A plurality of latent image elements that are transparent or translucent, are different from the color of the light reflection layer under specular reflection light, and the base image is divided and / or compressed The latent image element group consisting of When the intention change image is observed under diffuse reflected light, a visible image is visually recognized, and when observed at a specific observation angle under specular reflected light, the base image is mainly visually recognized as a latent image, and under regular reflected light. When the viewing angle is changed, the latent image is changed and / or dynamically viewed.

  In the latent image printed matter of the present invention, the value of the color difference ΔE in the visible image is 1/30 of the lightness L * and 1/20 of the chroma C * ab at the time of regular reflection provided in the light reflection layer. It is characterized by being less than the larger value.

  The latent image printed matter of the present invention is characterized in that a visible image having a color difference ΔE of 50 or less is formed.

  The latent image printed matter of the present invention has markedly improved the visibility of the latent image compared to the prior art due to the optical characteristics of the light reflection layer under specular reflection light.

  In addition, the latent image printed material of the present invention has a significantly wider color expression range of a visible image visible under diffuse reflected light than the prior art, and is excellent in design, and has a wide color expression range of a visible image. Nevertheless, it has an excellent change effect that completely disappears visually when a latent image appears under specular reflection light.

The latent image printed matter in this invention is shown. The schematic diagram of the significant information change image in the latent image printed matter of the present invention is shown. The visible image of the latent image printed matter of this invention is shown. 3 shows a group of hook-like elements of the latent image printed material of the present invention. The structure of the latent image element group of the latent image printed matter of this invention is shown. The lamination order of each element of the latent image printed matter of the present invention is shown. The effect of the latent image printed matter of the present invention is shown. The light reflection state of the light reflection layer and the bowl-shaped element of the present invention is shown. The structure of the latent image element group of the moire expansion system of the latent image printed matter of this invention is shown. The effect of the latent image printed matter of the present invention is shown. 2 shows a configuration of an IP system latent image element group of a latent image printed material according to the present invention. The effect of the latent image printed matter of the present invention is shown. The optical characteristic of the light reflection layer in the Example of this invention and Comparative Examples 1 and 2 is shown.

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

  FIG. 1 shows a latent image print (1) in the present invention. 1A is a front view of the latent image printed material (1), and FIG. 1B is a cross-sectional view taken along the line AA ′ of the latent image printed material (1). As shown in FIG. 1, the latent image printed matter (1) of the present invention includes a significant information change image (3) on a base material (2). In the present invention, the material of the substrate (2) is not particularly limited as long as it is provided with a printable plane, and paper, plastic, metal, or the like can be used. Further, the color and size of the substrate (2) can be freely selected.

  FIG. 2 shows a schematic diagram of the configuration of the significant information change image (3) of the latent image printed matter (1) of the present invention. In the significant information change image (3), the light reflection layer (5) is overlapped on the visible image (4), and the saddle-like element group (6) and the latent image element group (7) are further formed on the light reflection layer (5). ) Is formed. In the cross-sectional view of FIG. 1 (b), the ridge-shaped element group (6) is superimposed on the light reflecting layer (5), and the latent image element group (7) is further superimposed thereon, In the latent image printed matter (1) of the present invention, the significant information change image (3) has the latent image element group (7) overlaid on the light reflection layer (5), and further the saddle-like element group (6). May overlap each other (not shown). In any case, it suffices that either the saddle-like element group (6) or the latent image element group (7) is superimposed on the light reflecting layer (5) either above or below. The above is the outline of the configuration of the significant information change image (3) of the latent image printed matter (1).

  Next, the visible image (4) will be described with reference to FIG. The visible image (4) is formed of a color material having a color different from that of the substrate (2), and represents the first significant information that is visible under diffuse reflected light. The color material for forming the visible image (4) is not particularly limited as long as it is a material that can color the base material (2), such as ink, ink, and toner used in the printing method described later. Absent. One of the major features of the latent image printed material (1) of the present invention is the first significant information visible under diffuse reflected light, that is, the visible image (4) in a hue different from that of the prior art. An image having an extremely high contrast can be expressed. In the present embodiment, the visible image (4) is divided into the two areas of the information part (4A) and the background part (4B). However, it is not always necessary to separate the visible image (4). There is no problem even if such an ambiguous image with contours and colors is applied as it is as the visible image (4).

  However, in order to obtain the effect that the visible image (4) disappears under specular reflection light, it is necessary that all the colors of the visible image (4) are within a predetermined color difference ΔE. Specifically, in the visible image (4) expressed in different colors, the relationship is such that the color difference ΔE between the portions configured in different colors is within a predetermined range. Specifically, as in the present embodiment, when the information part (4A) and the background part (4B) are expressed in two different colors, the parts having different colors, that is, the information part (4A) and The background portion (4B) has a color difference ΔE within a predetermined range. In addition, if the visible image (4) is expressed in three different colors (not shown), all the color differences ΔE between the parts configured with the three colors are within a predetermined range. To do. Further, even when the visible image (4) is composed of three or more colors (not shown), similarly, all the color differences ΔE between the parts composed of different colors are within a predetermined range. To do. As long as the color difference ΔE of the visible image (4) falls within a predetermined range, various colors of different hues may be freely arranged in the visible image (4), and the visible image (4) as a monotone. A wide gradation expression range may be designed.

  The range of the color difference ΔE that can be applied to the visible image (4) depends on the optical characteristics of the light reflecting layer (5) described later. According to the results of the present applicant's production of a large number of samples and the tests conducted so far, when the light reflection layer (5) has only a light-dark flip-flop property, the lightness L during regular reflection of the light reflection layer (5). The value of 1/30 of the value of * is a guideline for the upper limit of the color difference ΔE that can be applied to the visible image (4). When the light reflecting layer (5) has color flip-flop properties, the light reflecting layer (5) A value that is 1/20 of the value of the saturation C * ab at the time of regular reflection is a guide for the upper limit of the color difference ΔE that can be applied to the visible image (4). For example, when the value of brightness L * at the time of regular reflection of the light reflection layer (5) is 600, the color difference ΔE allowed in the visible image (4) is 20 or less, and the regular reflection of the light reflection layer (5). When the value of the saturation C * ab at the time is 600, the color difference ΔE allowed in the visible image (4) is 30 or less.

  In the present invention, the principle that the visible image (4) can be visually recognized under diffusely reflected light and the latent image can be visually recognized under regular reflected light will be described later. The configuration with the color difference ΔE is preferable because the effect of disappearing the visible image (4) under regular reflection light can be obtained. However, even if the color difference ΔE of the visible image (4) is a value exceeding the above range, the light reflecting layer (5) has optical characteristics to be described later, so that the visible image (4) is visible under specularly reflected light. And the effect that the latent image can be visually recognized is obtained.

  As another reference, the color difference ΔE of the color applicable to the visible image (4) must be within a range not exceeding 50 under diffuse reflected light. On the other hand, if there is a portion with a color difference ΔE exceeding 50 in the visible image (4), no matter how the light reflecting layer (5) having excellent optical characteristics is used, the visible image under regular reflected light ( The disappearance effect of 4) cannot be guaranteed. That is, in the present invention, in order to make the visible image (4) disappear under the specularly reflected light and to exhibit the color expression under the diffusely reflected light to the maximum extent, the visible image ( It is desirable to form 4).

  Since the visible image (4) may be formed flat on the substrate (2), it may be formed by a highly productive printing method such as offset printing or letterpress printing. Moreover, you may form by gravure printing, flexographic printing, letterpress printing, screen printing etc. according to the manufacturer's equipment seeds. Further, it may be formed by a plateless digital printing method such as an IJP (inkjet printer) or a laser printer. In this case, different significant information can be variably printed for each printed matter. . The above is the description of the visible image (4).

  Next, the light reflection layer (5) overlapping the visible image (4) will be described. In the present invention, the light reflection layer (5) is at least one of a so-called light / dark flip-flop property in which light is strongly reflected during regular reflection to increase brightness, or a so-called color flip-flop property in which hue changes during regular reflection. It is necessary to have one of the optical characteristics, and it is necessary to have light transmittance without completely blocking light under diffuse reflected light. About light transmittance, what is necessary is just to be transparent or translucent so that the visible image (4) below can be visually observed. Note that the light reflecting layer (5) can be selected freely as long as the underlying visible image (4) is visible, even if it has a slight tint.

  The details of the operation of the light reflecting layer (5) in the present invention will be described later, but the visibility of the latent image is greatly improved by the light / dark flip-flop property and the color flip-flop property of the light reflecting layer (5). I am letting. The specific optical characteristics required for the light reflecting layer (5) of the latent image printed material (1) of the present invention are based on the results obtained by the applicant's preparation and testing of various samples so far. In the light reflection layer (5) having a regular reflection, the light reflection layer (5) needs to have a brightness (L *) of 400 or more. On the other hand, in the light reflection layer (5) having only a color flip-flop, Saturation (C * ab) of 200 or more is required. Such optical characteristics cannot be realized by printing using ordinary printing ink, and in order to dramatically improve the visibility of the latent image compared to the conventional techniques such as Patent Document 1 to Patent Document 6. This is the condition.

  In the present invention, “regular reflection lightness (L *)” and “regular reflection saturation (C * ab)” are defined as light from a light source with a vertical direction of 0 ° with respect to the light reflection layer (5). The values observed at an incident angle of 45 ° and a light receiving angle of 45 ° (however, the angle perpendicular to the incident angle with the vertical axis as the axis) are the lightness of the L * a * b * color system of CIE (1976) (L *) And saturation (C * ab). In addition, the specific value which measured the lightness (L *) and chroma (C * ab) of the regular reflection of a light reflection layer (5) is demonstrated in an Example.

  In addition, “lightness” in the present specification refers to the brightness of a color, which is bright when it is high and dark when it is low. “Saturation” refers to the degree of color vividness. In addition, “color” in the present invention represents a color including the concept of hue, saturation, and lightness, and “hue” refers to a color aspect such as red, blue, and yellow. Specifically, the intensity distribution of a specific wavelength in the visible light region (400 to 700 nm) is shown.

  Examples of the material having the function of the light reflection layer (5) having a light-dark flip-flop property include a reflective film, a transparent laminate film, a thin film, and the like. , A thin film interference film, a transparent hologram film, a liquid crystal film, and the like. The film may be attached to the substrate (2) from above the visible image (4) by pressure, heat, ultrasonic waves, vibration, adhesive, or the like. The above is the description of the light reflecting layer (5).

  Next, the bowl-shaped element group (6) will be described with reference to FIG. FIG. 4 is a diagram showing an example of the configuration of the saddle-like element group (6) in the present invention. The saddle-like element group (6) shown in FIG. 4 is a straight line having a constant width (W1), and is constant. The ridge-like elements (8) having a ridge shape having a raised height are arranged in a line. More specifically, the hook-shaped elements (8) are continuously arranged at a constant pitch (P1) in a first direction (S1 direction in the figure) orthogonal to the image line direction. In addition, although the enlarged view of FIG. 4 shows a state where there is a non-image portion where the base material (2) is exposed between the bowl-shaped element (8) and the bowl-shaped element (8), the bowl-shaped element The saddle-shaped element group (6) having no non-image portion may be configured by arranging (8) without a gap. In the present embodiment, the saddle-like element group (6) will be described as an example of a group of saddle-like drawing lines having swells. It is not limited to the above, but as a bowl-like pixel form described in Japanese Patent No. 4682283 and Japanese Patent No. 4660775, it is simply arranged at a constant pitch in the vertical and horizontal directions as a bowl-like element group (6). Also good.

  The material forming the saddle-like element (8) must have the property of transmitting light and should not have a structure that absorbs or reflects at least all of the light. This is because the light transmitted through the bowl-shaped element group (6) under regular reflection light is reflected by the light reflection layer (5), thereby improving the visibility of the latent image. Moreover, the characteristic which permeate | transmits light should just be transparent or translucent so that the visible image (4) below can be visually recognized under diffuse reflection light. For this reason, it is most preferable to use a transparent printing ink or resin, but it may be formed using an ink in which a colored pigment is blended as long as it transmits light.

  The saddle-like element group (6) having the above-described configuration is formed by a printing method capable of producing a raised printed image line. In order to ensure a certain level of visibility in the latent image that appears under specular reflection light, the height of the saddle-like element (8) is required to be at least 1 μm and desirably 3 μm or more. From the standpoint that it is possible to produce a swelled printed image line, it is desirable to form it by screen printing or intaglio printing, but the latent image is visible even in gravure printing, flexographic printing, letterpress printing, IJP printing, etc. It is possible to form an image line having a height as high as possible. Further, the upper limit of the height of the rise is not particularly limited, but is preferably 1 mm or less in consideration of stability, friction resistance, distribution suitability and the like when loaded in large quantities. The above is the description of the bowl-shaped element group (6).

  Next, the latent image element group (7) will be described with reference to FIG. The latent image element group (7) shown in FIG. 5 will be described with respect to an example created by the method described in Japanese Patent No. 4682283, but the configuration of the latent image element group (7) in the present invention is the example shown in FIG. The configuration of the other latent image element group (7) is described later.

  The latent image element group (7) shown in FIG. 5 includes a first latent image element group (7A) and a second latent image element group (7B). The first latent image element group (7A) has a pitch in which the first latent image element (9A) having a fixed image line width (W2) is arranged in a first direction (direction S1 in the drawing). By arranging a plurality of pitches (P1) equal to (P1), the alphabet “A” is represented. That is, in FIG. 5, each of the first latent image elements (9A) corresponds to an image line obtained by dividing a base image “A” (not shown) that is the basis of the latent image. In the second latent image element group (7B), the second latent image element (9B) having a constant image line width (W3) is arranged in the first direction (S1 direction in the drawing). By arranging a plurality of elements (9A) at the same pitch (P1) as the element (9A), the letter “B” of the alphabet is represented. That is, in FIG. 5, each of the second latent image elements (9B) corresponds to an image line obtained by dividing a base image “B” (not shown) that is the basis of the latent image. Note that the image line width (W2) of the first latent image element and the image line width (W3) of the second latent image element may be the same or different.

  As shown in the enlarged view of FIG. 5A, the first latent image element group (7A) and the second latent image element group (7B) have phases in the first direction (S1 direction in the figure). By arranging them in a shifted manner, the latent image elements (9A, 9B) are arranged without overlapping. In the following description, the latent image element (9) will be described in the case of referring to the entire latent image element, not specifically the individual latent image elements (9A, 9B).

  Each latent image element (9) is not necessarily raised, and may be formed by any printing method. In view of productivity, it is most preferable to use offset ink to form by offset printing. The latent image element (9) has a light transmitting property to make the visible image (4) visible under diffuse reflected light, is transparent or translucent, and is a latent image element group under regular reflected light. In order to visualize part of the information in (7), the latent image element (9) needs to be different from the color at the time of regular reflection of the light reflection layer (5). As a material for forming the latent image element (9) having such characteristics, there is specifically a mat ink. Further, when the light shielding property is imparted to the latent image element (9), the latent image element (9) suppresses light reflected from the light reflecting layer (5) under the bowl-shaped element (8). Therefore, the color difference between the saddle-like element (8) and the latent image element (9) generated under specular reflection light is increased, and the visibility of significant information represented by the latent image is further increased. Therefore, when it is desired to further improve the visibility of the latent image, a functional material having a high light blocking property such as titanium dioxide or aluminum oxide may be added to the printing ink for printing the latent image element group (7). . An ink containing such a functional material appears transparent or translucent if the mixing ratio of the material is an appropriate amount.

  Further, the latent image element (9) can be formed not only by ink but also by cutting the bowl-shaped element (8). Such cutting can be easily performed by using a laser processing machine. The saddle-like element (8) irradiated with the laser loses its surface smoothness, and much of the light reflected from the light reflecting layer (5) is scattered on the surface of the saddle-like element (8). In many cases, the reflected light of the bowl-shaped element (8) is greatly reduced. Therefore, the necessary characteristics can be imparted to the latent image element (9) of the present invention. Thus, when using a laser processing machine, there is a feature that different information can be easily given to each printed matter. As another method for providing the latent image element (9) as variable information, there is a method using a printer that can use transparent toner or transparent ink. The above is the description of the latent image element group (7).

  FIG. 6 is a diagram showing the stacking relationship and the printing order of the substrate (2), the visible image (4), the light reflecting layer (5), the saddle-shaped element group (6), and the latent image element group (7). FIG. 6A shows that the latent image printed material (1) includes a substrate (2) to a visible image (4), a light reflection layer (5), a bowl-shaped element group (6), and a latent image element group (7). In FIG. 6B, the latent image print (1) is formed from the base material (2) to the visible image (4), the light reflecting layer (5), the latent image element group (7), It is the laminated form which overlapped in order of the bowl-shaped element group (6). In any form, at least a part of each latent image element (9) overlaps the bowl-like element (8) in the positional relationship of the bowl-like element group (6) and the latent image element group (7). The image changing effect of the latent image printed matter (1) according to the present invention under the regular reflection light is exhibited as long as this condition is satisfied.

  FIG. 7 shows the effect of the latent image printed material (1) configured as described above. As shown in FIG. 7A, when the latent image printed material (1) is observed under diffuse reflection, the alphabet “C” divided by the difference in hue is visually recognized in the significant information change image (3). The In this case, the letter “C” of the alphabet is visually recognized in red and its surroundings in green. On the other hand, as shown in FIG. 7B, when the latent image printed matter (1) is observed at a specific observation angle under specular reflection light, the visible light in the lower layer is reflected by extremely strong reflected light emitted from the light reflection layer (6). The color of the image (4) is not captured, the alphabet “C” disappears visually, and the alphabet “A” represented by the first latent image element group (7A) is visible. As shown in FIG. 7C, when the character “A” is observed at a specific angle different from the angle at which the character “A” can be visually recognized, the alphabet “A” represented by the first latent image element group (7A) is displayed. "Disappears, and the alphabet" B "represented by the second latent image element group (7B) is visible.

  The reason why the above effects occur will be described. Under diffuse reflected light, the image having the object color is only the visible image (4), and the light reflecting layer (5), the bowl-shaped element group (6) and the latent image formed on the visible image (4). Since the element group (7) is transparent, only the visible image (4) is visually recognized.

  Next, the principle of the image change effect under regular reflection light will be described with reference to FIG. FIG. 8A is a view of the latent image printed matter (1) in the case of the laminated structure shown in FIG. 6A, observed from the side surface in units of hook-like elements (8), and FIG. FIG. 7 is a view of the latent image printed matter (1) in the case of the laminated structure shown in FIG. 6B, observed from the side surface in units of hook-like elements (8). In any laminated structure, only the light (12A) incident from the light source (10) at an angle orthogonal to the image surface of the bowl-shaped element (8) is the bowl-shaped element (8). Incident inside. Of the light emitted from the light source (10), light other than the light (12A) incident at an angle orthogonal to the surface of the line of the bowl-shaped element (8) is reflected by the surface of the bowl-shaped element (8) and scattered light. And cannot enter the interior of the bowl-shaped element (8). Thus, the light which can enter into the inside of a bowl-shaped element (6) among the lights irradiated from the light source (10) is restrict | limited to the light of a specific incident angle.

  In the case of the structure of FIG. 8A, the incident light (12B) that has entered the inside of the bowl-shaped element (8) is reflected by the light reflecting layer (5) to become reflected light (12C), and the bowl-shaped element. When transmitting from the inside of (8) to the outside, depending on the angle, it interferes with the latent image element (9) on the image surface of the bowl-shaped element (8) or directly interferes with the latent image element (9). It does not pass through. If the reflected light (12C) interferes with the latent image element (9), the amount of reflected light decreases. On the other hand, if the reflected light passes without interfering with the latent image element (9), the reflected light amount is It does not change. As described above, the amount of reflected light varies depending on whether or not it interferes with the latent image element (9) on the image surface of the bowl-shaped element (8) when transmitting from the inside of the bowl-shaped element (8) to the outside. Strength is generated, and the information of the latent image element (9) on the surface of the image line is sampled. At this time, since the amount of reflected light generated from the light reflecting layer (5) is extremely large, the color difference in the visible image (4) under the light reflecting layer (5) cannot be captured, and in the visible image (4) visually. The color difference of disappears. Based on the above principle, the visible image (4) disappears under specular reflection light, and any base image represented by the latent image element group (7) appears as a latent image. Further, if the angle of the reflected light (12C) changes (if the angle of the incident light (12A) changes), the position of the image line surface through which the reflected light (12C) passes changes, thereby The position at which the information of the latent image element (9) is sampled changes, the information of another latent image element (9) is sampled, the appearing base image disappears, and the base image changes to a different base image. . In the visible image (4), the portion where the color difference ΔE exceeds 50 is not completely lost by the reflected light of the light reflecting layer (5), but disappears from the state visually recognized under the diffuse reflected light. It becomes a trend. In that case, the visible image (4) is slightly visible under the specularly reflected light, but as a result, it appears due to the reflected light obtained from the light reflecting layer (5) and the latent image element group (7). Since the visibility of the latent image is higher, the latent image is mainly visually recognized.

  On the other hand, in the case of the structure of FIG. 8B, the incident light (12B) that has entered the inside of the bowl-shaped element (8) is reflected by the light reflecting layer (5), but the light reflecting layer (5). Since each latent image element (9) is formed on the surface of the surface of the light reflection layer (5), the latent image element (9) interferes with the latent image element (9) on the surface of the light reflection layer (5) depending on the angle or is reflected as it is. 9) is reflected without interference. If the incident light (12A) interferes with the latent image element (9), the reflected light amount of the reflected light (12C, 12D) decreases, and on the other hand, it does not interfere with the latent image element (9) as it is. When reflected by the light reflecting layer (5), the amount of reflected light (12C, 12D) does not change, so the information of the latent image element (9) is sampled by the intensity of the reflected light. In this form, each reflected light is transmitted from the inside of the bowl-shaped element (8) to the outside. At this time, since the amount of reflected light generated from the light reflecting layer (5) is extremely large, the color difference in the visible image (4) under the light reflecting layer (5) cannot be captured, and in the visible image (4) visually. The color difference of disappears. Based on the above principle, the visible image (4) disappears under specular reflection light, and any base image represented by the latent image element group (7) appears. Further, if the angle of the reflected light (12C) changes (if the angle of the incident light (12A) changes), the reflection position on the light reflecting layer (5) changes, so that the light reflecting layer (5). The position at which the information of the latent image element (9) on the surface is sampled changes, the information of another latent image element (9) is sampled, and the displayed base image changes to a different base image. The configuration is the same as that of 8 (a).

  Based on the above principle, any base image represented by the latent image element group (7) appears. Although light from the light source (10) in FIG. 8 is considered to be slightly refracted when incident on the bowl-shaped element (8) and transmitted from the surface of the bowl-shaped element (8), Small refraction itself does not create this change effect. The image change effect under specular reflection light of the present invention is completely different from the image change effect under diffuse reflection light using a lens effect (light refraction) such as a lenticular or microlens array. This is because the image changing effect of the present invention is manifest even when the bowl-shaped element (8) has a very thin thickness of about several μm. If the image change effect is caused by light refraction similar to that of a lenticular or microlens array, the thickness of the bowl-shaped element (8) is too thin (a lenticular or microlens array having the same pitch). If used, a thickness of 150 μm or more is required to produce a change effect.) It is also clear from the fact that this change effect does not occur under diffuse reflected light. In addition, since this effect does not occur unless the incident light (12B) always enters the inside of the bowl-shaped element (8), the change effect using reflected light on the surface of the image line described in Patent Documents 1 to 5 is also known. The principle is different.

  As described above, in the present invention, the principle of generating a change effect under specular reflection light is different from the principle of anti-counterfeiting technology having any change effect that has existed so far. The angle of the incident light (12A) is first limited by the saddle-shaped element (8) having a curved surface, and the amount of reflected light is increased by the light reflecting layer (5). The principle of sampling only a part of the information is unique. By utilizing the above unique principle, the reflected light (12C, 12D) emitted from the light reflecting layer (5) in the latent image printed material (1) of the present invention is reflected from the reflected light generated from any printed film that can be formed by printing. Is much larger, and the visibility of the latent image can be dramatically improved as compared with the conventional technology.

  In the latent image element group (7) shown in FIG. 5, two base images are visually recognized by the two latent image element groups (7A, 7B), but the number of latent image images is limited to two. Instead, it is possible to give more than n latent image images (n is an integer of 3 or more). That is, if n latent image images are to be provided, the first latent image element group (7A) is constituted by the first latent image element (9A), and the second latent image element group (7B) is formed. It is composed of the second latent image element (9B), the nth latent image element group is composed of the nth latent image element, and the latent image elements are arranged so as not to overlap each other. Should be arranged. The saddle-like element (8) and the latent image element (9) are not limited to the image line, and may be pixels. Regarding specific configurations of these elements, configurations described in Japanese Patent No. 468283, Japanese Patent No. 4660775, and the like can be used.

  In the present invention, regular reflection refers to a phenomenon in which when light is incident on a substance at an incident angle, strong reflected light is generated at the same angle opposite to the angle of the incident light. 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. Observing under specularly reflected light means observing from a viewpoint at a reflection angle that is approximately equal to the angle of light incident on the printed matter. Observing under diffusely reflected light means a larger angle than the angle of light incident on the printed matter. It refers to the state of observation at different angles.

  In the latent image printed matter (1) described so far, the latent image element group (7) is obtained from the latent image element (9) by using the latent image element (9) for specific significant information such as the technology described in Japanese Patent No. 4682283 and Japanese Patent No. 4660775. This is a form formed by using a divided image line configuration. By tilting the latent image printed matter (1), an image change effect of changing from significant information to different significant information occurs. However, the structure of the latent image element group (7) of the latent image printed material (1) of the present invention and the effect produced by the structure are not limited to this. For example, as described in Japanese Patent No. 4844894 and Japanese Patent No. 5131789, a moving image effect using a “moire enlargement phenomenon” in which moire is enlarged and visually recognized, or described in Japanese Patent No. 5200284. As in the above technique, the present invention may be applied to a form in which the moving picture effect of the integral photography system is generated. These will be specifically described below.

  Subsequently, using a different image line configuration from the latent image element group (7) shown in FIG. 5 and utilizing a phenomenon called moire enlargement phenomenon, significant signs, characters, numbers, etc. This is a form in which the information itself appears as a moiré, and does not cause the effect of changing the image under the specular reflection light shown in FIG. 5, but has a moving image effect in which the moiré that appears under the specular reflection light appears to move. The resulting configuration will be described with reference to FIG.

  The latent image element group (7) shown in FIG. 9 is an example produced by the method described in Japanese Patent No. 4844894 and Japanese Patent No. 5131789, and the latent image element group (7) is an alphabet “J”. And “P” as a base image (13A, 13B), a plurality of base images (13A, 13B) are compressed in a first direction (S1 direction in the figure) to have a constant width (W2, W3). It consists of latent image elements (9A, 9B). One compressed alphabet “J” is used as the first latent image element (9A), and the pitch (P1) is different from the arrangement pitch (P1) of the bowl-shaped element group (6) in the first direction (S1 direction in the figure). P2) is arranged in succession, and the other compressed alphabet "P" is used as the second latent image element (9B), and the saddle-like element group (6) in the first direction (direction S1 in the figure) They are continuously arranged at a pitch (P3) different from the arrangement pitch (P1).

  In this embodiment, since the pattern appearing under specular reflection light is a moire pattern, the pitch (P2, P3) of the latent image element (9) arranged in the first direction and the bowl-shaped element (8) The pitch (P1) needs to be different from each other. The value must not be a number that is divisible by one value. When one value is a numerical value of about 80% to 120% (excluding 100%) of the other value, a moire pattern with high visibility and high moving image effect appears. The above is the image line configuration of the latent image element group (7).

  The effect of the latent image printed matter (1) in which the latent image element group (7) having the above configuration is formed on the bowl-shaped element group (6) will be described. As shown in FIG. 10, when the latent image printed material (1) is observed under diffuse reflected light, the alphabet “C” divided by the difference in hue in the significant information change image (3) is visually recognized. In this case, the letter “C” of the alphabet is visually recognized in red and its surroundings in green. On the other hand, as shown in FIG. 10B, when the latent image print (1) is observed at a specific observation angle under specular reflection light, the visible light in the lower layer is reflected by extremely strong reflected light emitted from the light reflection layer (5). The color of the image (4) is not captured, and the moire pattern generated by the interference between the latent image element (9) and the bowl-shaped element (8) appears as the same shape as the base image (13A, 13B). Further, as shown in FIGS. 10B and 10C, by changing the observation angle, a so-called moving image effect is produced in which the appearing moire pattern appears to move in the first direction. The principle that moire occurs due to interference between lines and pixels having different pitches is well known, and the principle that moire patterns appear to move when the sampling position changes is disclosed in Japanese Patent Nos. 4844894 and 5131789. The explanation is omitted because it is the same as the principle described in the publication. The above is the basic image (13A, 13B) that appears under specular reflection light by applying the image line configuration using the moire magnification phenomenon to the latent image element group (7) of the latent image printed material (1) of the present invention. It is description of the form which appears to move. Note that the image line configuration using the moire expansion phenomenon is not limited to the configuration illustrated in FIG. 9, and other image line configurations described in Japanese Patent Nos. 4844894 and 5131789 are used. May be.

  Subsequently, a moving image effect similar to that of moiré is produced by applying an image obtained by a stereoscopic image capturing method called integral photography, which is different from the image line configuration shown in FIGS. 5 and 9. An image line configuration for this purpose will be described. This applies the image line configuration described in Japanese Patent No. 5200284 to the latent image line group (7).

  In the latent image element group (7) shown in FIG. 11, a frame (not shown) having a specific height (H) and width (W2) is applied to the base image (13) representing specific significant information. To divide the base image (13), take out each of the divided base images (13), and compress the latent image compressed in a specific width (W2) at a specific compression rate in the first direction (direction S1 in the figure). It consists of a set of image elements (9). Further, as shown in the enlarged view of FIG. 11, adjacent latent image elements shift the fitted frames with respect to the base image (13) in the first direction (S1) by one pitch (P1). The image is slightly different because it is compressed. Each latent image element (9) is continuously arranged in the first direction (direction S1 in the drawing) at a pitch (P1) equal to the pitch (P1) at which the bowl-shaped elements are arranged, whereby a latent image element group ( 7) is formed. As a more specific manufacturing method, the method described in Japanese Patent No. 5200284 is used.

  FIG. 12 shows the effect of the latent image printed material (1) when the image line configuration of the latent image element group (7) in FIG. 11 is used. As shown in FIG. 12, when the latent image printed matter (1) is observed under diffuse reflected light, the alphabet “C” classified by the difference in hue is visually recognized in the significant information change image (3). In this case, the letter “C” of the alphabet is visually recognized in red and its surroundings in green. On the other hand, as shown in FIG. 12B, when the latent image print (1) is observed at a specific observation angle under specular reflection light, the visible light in the lower layer is reflected by extremely strong reflected light emitted from the light reflection layer (5). The color of the image (4) cannot be captured, and the latent image generated by the interference between the latent image element (9) and the bowl-shaped element (8) appears in the same shape as the base image (13). Further, as shown in FIGS. 12B and 12C, by changing the observation angle, a so-called moving image effect is generated in which the appeared base image (13) appears to move in the first direction. Since the method for producing the latent image element group (7) of the integral photography system and the principle for producing the effect are the same as in Japanese Patent No. 5200284, the description thereof is omitted. The above is the basic image (13) that appears under specular reflection light by applying the image line configuration using the integral photography system to the latent image element group (7) of the latent image printed material (1) of the present invention. It is description of the form which appears to move. Note that the configuration of the latent image printed matter (1) using the integral photography system is not limited to the configuration including the image line illustrated in FIG. 11, and includes the pixel described in Japanese Patent No. 5200284. It is good also as a structure. Moreover, in the structure which consists of a drawing line, the concentric form described in Japanese Patent Application No. 2013-023228 for which this applicant applied, or all the curved lines which change a drawing line direction continuously and form various drawing line angles. You may use the structure by.

  Hereinafter, specific examples of the latent image printed material (1) produced according to the embodiment for carrying out the invention will be described in detail with reference to FIG. 1 to FIG. 7. It is not limited to examples.

Example 1
Example 1 will be described with reference to FIGS. FIG. 1 shows a latent image print (1) of Example 1. In the latent image printed material (1) of Example 1, the visible image (4) is formed on the substrate (2), the light reflecting layer (5) is formed thereon, and the ridge-like element group (6) is formed thereon. ) And a latent image line group (7) is formed thereon.

  The visible image (4) represents the alphabet “C” as the first significant information, the information part (4A) which is the letter “C” of the alphabet is red, and the surrounding background part (4B) is different in green. It was formed as a hue color. The color difference ΔE of the surrounding background (4B) relative to the letter “C” (4A) of the alphabet was 28. For the base material (2), white coated paper (Esprit Coat FM, Nippon Paper Industries Co., Ltd.) is used, and for the light reflecting layer (5), a transparent thin film interference film (MLF Teijin) is used. Affixed to (2). This transparent thin film interference film is transparent under diffuse reflected light, but emits very strong reflected light under specular reflected light, and has excellent light and dark flip-flops and color flip-flops that greatly change both brightness and hue. Have both optical properties.

  FIG. 13 shows the lightness (L *) and chroma (C * ab) of regular reflection of the light reflecting layer (5) in Example 1. The brightness of the light reflection layer (5) was measured using a variable angle spectrophotometer (GCMS-4, Murakami Color Research Laboratory Co., Ltd.). The measurement conditions are a D65 light source, a 10-degree field of view, and an incident light incident angle of 45 °, and the spectral reflectance in the visible light region is measured with a light receiving angle in the range of 0 ° to 80 °. Based on the L * a * b * color system, the lightness (L *) and chroma (C * ab) of regular reflection were calculated. As shown in FIG. 13, the brightness (L *) of regular reflection at a light receiving angle of 45 ° is an extremely high value of 800 or more, and the saturation (C * ab) is an extremely high value of 700 or more.

  FIG. 4 shows a specific configuration of the bowl-shaped element group (6). In the saddle-like element group (6), the saddle-like element (8) having a width (W1) of 0.3 mm and an ink film thickness of 0.015 mm is continuously formed in the first direction (at a pitch (P1) of 0.4 mm). It was set as the structure arrange | positioned in the figure (S1 direction). This saddle-like element (8) is formed on the light reflecting layer (5) pasted on the substrate (2) by using a transparent UV screen ink (UVA 9117, Seiko Advance Co., Ltd.) by the UV screen printing method. did.

  FIG. 5 shows a latent image element group (7) of the first embodiment. Each latent image element (9A, 9B) has an image line width (W3) of 0.15 mm, and is continuously arranged in a first direction (S1 direction in the figure) at a pitch (P1) of 0.4 mm to form a latent image. Element group (7) was produced. This latent image element group (7) uses a mixed ink obtained by mixing about 10% of a UV white ink containing titanium oxide with a gray UV offset ink (BEST CURE UV L special matt gray, T & K TOKA Co., Ltd.). Then, a latent image printed material (1) of Example 1 was obtained by UV offset printing and overlaid on the bowl-shaped element group (6). The saddle-shaped element group (6) and the latent image element group (7) form the center of the saddle-shaped element (8) forming the saddle-shaped element group (6) and the latent image line group (7). The latent image elements (9) are overlapped so that their centers coincide.

  FIG. 7 shows the effect of the latent image printed material (1) configured as described above. As shown in FIG. 7A, when the latent image printed material (1) is observed under diffuse reflection, the alphabet “C” divided by the difference in hue is visually recognized in the significant information change image (3). It was. In this case, the letter “C” of the alphabet was visually recognized in red and the surrounding area in green. On the other hand, as shown in FIG. 7B, when the latent image printed matter (1) is observed at a specific observation angle under specular reflection light, the visible light in the lower layer is reflected by extremely strong reflected light emitted from the light reflection layer (5). The color of the image (4) is not captured, the alphabet “C” disappears visually, the alphabet “A” represented by the first latent image element group (7A) can be visually recognized, and FIG. ), When observed at a specific angle different from the angle at which the letter “A” is visible, the alphabet “A” represented by the first latent image element group (7A) disappears, The alphabet “B” represented by the second latent image element group (7B) was visible. As described above, it was confirmed that the latent image printed material (1) of the present invention exhibited desired performance.

(Comparative Example 1)
In Comparative Example 1, an example in which only the light reflection layer (5) of Example 1 is formed from a thin film interference film with printing pearl ink will be described. Since the configuration other than the light reflection layer (5) is the same as that of the first embodiment, the description thereof is omitted.

  The light reflecting layer (5) was prepared with a printing pearl ink prepared with the formulation shown in Table 1. A printed film produced with this ink is translucent under diffuse reflected light, has an optical characteristic that emits a gold interference color during regular reflection, and has excellent color flip-flop properties. FIG. 13 shows the lightness L * and chroma C * ab of the light reflecting layer (5). The lightness L * at a light receiving angle of 45 ° was about 250, and the saturation was about 70.

  Although the configuration other than the light reflection layer (5) was the same as that of the printed matter of Example 1, the effect was completely different. First, the visible image (4) was visible under diffusely reflected light, but the visible image (4) was not lost under regular reflected light, and the base image was not changed to the alphabets “A” and “B”. As a result, the latent image element group (7) itself is visually recognized as it is. As described above, the effect of the present invention could not be exhibited by a film formed with printing ink.

(Comparative Example 2)
In Comparative Example 2, an example in which only the light reflection layer (5) of Example 1 is formed of a transparent ink from a thin film interference film will be described. Since the configuration other than the light reflection layer (5) is the same as that of the first embodiment, the description thereof is omitted.

  The light reflecting layer (5) was made of a transparent ink for printing produced by the formulation shown in Table 2. A printed film produced with this ink is transparent under diffuse reflected light, and has a bright and dark flip-flop property that strongly reflects light during regular reflection. FIG. 13 shows the lightness L * and chroma C * ab of the light reflecting layer (5). The lightness L * at a light receiving angle of 45 ° was about 300, and the saturation was about 15.

  Although the configuration other than the light reflection layer (5) was the same as that of the printed matter of Example 1, the effect was completely different. First, the visible image (4) was visible under diffusely reflected light, but the visible image (4) was not lost under regular reflected light, and the base image was not changed to the alphabets “A” and “B”. As a result, the latent image element group (7) itself is visually recognized as it is. As described above, the effect of the present invention could not be exhibited by a film formed with printing ink.

DESCRIPTION OF SYMBOLS 1 Latent image printed matter 2 Base material 3 Significant information change image 4 Visible image 5 Light reflection layer 6 Haze-like element group 7 Latent image element group 8 Haze-like element 9 Latent image element 10 Light source 11 Observer's viewpoint 12A, 12B Incident from light source Light 12C, 12D light 13 reflected by the light reflection layer 13 image

Claims (3)

A significant information change image is provided on at least a part of the substrate, and the significant information change image is formed of a visible image formed of a color material having a color different from that of the substrate, and a light / dark flip-flop property on the visible image. At least one of the optical characteristics of color flip-flop, and at least one of the optical characteristics of lightness L * at regular reflection of 400 or more or saturation C * ab at regular reflection of 200 or more, and A transparent or translucent light reflecting layer is formed under diffusely reflected light, and transparent or translucent saddle-like elements are arranged on the light reflecting layer at a constant pitch, and transparent Alternatively, a latent image element that is translucent and has a plurality of latent image elements that are different from the color of the light reflection layer under regular reflection light under regular reflection light and that is obtained by dividing and / or compressing the base image. The group is formed by overlapping, When the information change image is observed under diffuse reflection light, the visible image is visually recognized. When the information change image is observed at a specific observation angle under specular reflection light, the base image is mainly visually recognized as a latent image, and under the regular reflection light. A latent image printed matter, wherein the latent image is changed and / or dynamically viewed when the observation angle is changed. The value of the color difference ΔE in the visible image is equal to or less than the larger value of 1 / 30th of the lightness L * and the 20th of the saturation C * ab at the time of regular reflection provided in the light reflection layer. The latent image printed matter according to claim 1, wherein: The latent image printed matter according to claim 1, wherein the visible image having a color difference ΔE of 50 or less is formed.

Images