JP2021187093A - Latent image printed matter - Google Patents

Abstract

To provide a latent image printed matter which does not use a special brilliant pigment, imparts rich hue to a latent image which appears under regular reflectance, and allows a significant image different from the latent image to be perceived even under diffuse reflectance.SOLUTION: A latent image printed matter comprises, on at least a part of a substrate, a printed image formed by superposing a latent image element group, a semi-cylindrical shaped element group, and a hue layer. The latent image element group is formed by arrangement of a plurality of latent image elements. The semi-cylindrical shaped element group has a first image indicating significant information with a difference of area ratios of the semi cylindrical shaped elements. The hue layer forms a concentration difference image with lightness difference. When the latent image printed matter is observed under diffuse reflectance, a first color image combining the first image and the concentration difference image are combined is visible. When the printed matter is observed under regular reflectance, the first color image is not visible and a second color image including a latent image in which the hue element group and the latent image element group are combined is visible. When the printed matter is observed with a varying observation angle, the latent image looks moving.SELECTED DRAWING: Figure 2

Description

INDUSTRIAL APPLICABILITY According to the present invention, in the field of security printed materials such as banknotes, passports, securities, identification cards, cards and toll tickets that require anti-counterfeiting effect, images visually recognized under diffuse reflection light and specular reflection light can be displayed. The present invention relates to a latent image printed matter having high authenticity discrimination and counterfeit resistance, which achieves both a moving visual effect under specular light and a rich color expression in addition to the changing effect of a changing image.

In recent years, there has been a tendency to be used as an authenticity discrimination factor for security printed matter because the image change effect in which multiple images are switched and the moving image effect in which images appear to move are easily noticeable and difficult to forge. .. A typical technology with these effects is hologram, which is widely used by being attached to security printed matter such as banknotes and passports, which require high security, in various forms with change effects and video effects. ing.

On the other hand, in addition to holograms, there are also authenticity discrimination elements that use known technologies such as parallax barriers and lenticulars, and have an image change effect that switches between multiple images with a slight angle change and a moving image effect that makes the image appear to move. , Already exists.

However, although holograms are used in various security printed matter represented by banknotes, they have major problems in the complexity of the manufacturing process and high manufacturing cost as compared with general printed matter. Since a clear layer or a lens is required for the authenticity discrimination element using a parallax barrier or lenticular, the base material is almost limited to plastic, and the printed matter requires a certain thickness (at least about 150 μm). It cannot be used for printed matter with a limited thickness, and tends to be used only for plastic cards that allow a certain thickness.

In order to solve the above problems, the applicant is a technique for superimposing a transparent latent image element group on a forgery-shaped element group having high gloss and swelling, and is included in the latent image element group. We have already applied for an anti-counterfeiting technique that realizes the effect that a plurality of latent image images appear to move according to the observation angle and the latent image image changes (see, for example, Patent Documents 1 to 3). This technology utilizes the phenomenon that when light is incident on a gauze-shaped element at a specific angle, only the image line surface at an angle orthogonal to the incident light strongly reflects light among the image line surfaces of the gadget-shaped element group. By doing so, only a part of the latent image image of the latent image element group superimposed on the surface of the image line reflecting the light is visualized by the difference in the amount of reflected light and the color. This technology can be formed with a thickness of about 1/10 of that of a paralux barrier or lenticular, and the manufacturing technology can be easily implemented by utilizing the conventional plate making technology and printing technology. Moreover, it has an excellent feature that a printed image having a change effect and a moving image effect similar to a hologram can be formed at the same cost as a general printed matter.

Further, there is a technique for applying the techniques described in Patent Documents 1 to 3 to generate a rich color change under specularly reflected light (see, for example, Patent Document 4). Unlike the techniques described in Patent Documents 1 to 3, these appear under regular reflected light by arranging a color layer formed by coloring ink under the scab-like element group and the latent image element group. It is a technology that realizes complicated and diverse color changes in latent image images.

Japanese Patent No. 4682283 Japanese Patent No. 5131789 Japanese Patent No. 5200284 Japanese Unexamined Patent Publication No. 2019-126977

In the techniques described in Patent Documents 1 to 4, a part of the image line surface of the reflective layer and the bulging hump-like element strongly reflects light, and the latent image is superimposed on the light-reflected image line surface. This is a technique in which a latent image appears by sampling a part of the image element according to the difference in reflectance and color. Among these techniques, in the techniques described in Patent Documents 1 to 3, the color of the latent image image appearing at the time of specular reflection is the optics of the bright pigment (functional pigment) contained in the gauze-like element. Determined by characteristics. Therefore, in many cases, it is difficult to express natural colors due to the glittering or metallic color expression derived from the glitter pigment. In particular, it was difficult to express natural colors that were not too bright. Further, in these techniques, usually, only one color can be expressed by the bright pigment of the reflective layer or the semi-cylindrical element group, and the basic limit is to express the other color by the latent image element. It was difficult to express complex colors of two or more colors.

Further, the techniques described in Patent Documents 1 to 3 color a group of scab-like elements and change the area ratio of a part of the stalk-like elements to make a visible image appearing under diffuse reflection light. (Corresponding to the first image of the present invention), this visible image disappears visually due to the increase in the brightness of the gauze-like element group under specularly reflected light, and a latent image image appears in its place. A form that realizes the so-called change effect is included. However, in these forms, in order to compose a visible image, a semi-cylindrical element is composed of an ink containing a special brilliant pigment imparted with special water repellency and oil repellency, a vapor-deposited aluminum pigment having extremely high brightness, and the like. I had to do it. That is, it is a configuration that makes the visible image disappear by utilizing the remarkable increase in brightness at the time of specular reflection caused by the special bright pigment contained in the Kamaboko-like element, and the change effect generated by these technologies is the special bright. The effect was dependent on the sex pigment. However, these special brilliant pigments are vulnerable to friction, have the problem of robustness against scratches such as being peeled off by scratching and scratching the surface of the image, and need to withstand long-term use like banknotes. There was a problem that it could not be used for printed matter. In addition, since the kamaboko-like element needs to be colored, the visible image visually recognized under diffuse reflection light basically needs to be composed of dark colors.

On the other hand, in the technique of Patent Document 4, unlike the techniques of Patent Documents 1 to 3, by using a color layer without using a special bright pigment, a moving image effect appearing under normal reflected light can be obtained. It is possible to impart two or more colors to the provided latent image, and in addition, since it is not necessary to use a special bright pigment, there is no problem with fastness. However, while the latent image that appears under specular reflection can be multicolored, under diffuse reflection light, a special bright pigment is not used and the color layer is visually recognized as it is. Therefore, Patent Document 1 It was difficult to obtain the change effect realized by the technologies up to Patent Document 3.

The present invention aims to solve the above problems, and it is not necessary to use a special bright pigment, it is excellent in fastness, and it is possible to obtain a latent image image that appears under normal reflected light without impairing the moving image effect. The present invention relates to a latent image printed matter capable of imparting rich colors and recognizing a completely different meaningful image different from the latent image even under diffuse reflection light.

The latent image printed matter of the present invention includes a printed image formed by laminating a latent image element group, a scabbard element group, and a color layer on at least a part of a base material, and the latent image element group is a scabbard element group. A group of latent image elements that are laminated on a higher layer, have light transmission properties, and have a plurality of latent image elements that are divided or compressed by dividing or compressing the basic image are regularly arranged at a predetermined pitch, and the 蒲 鉾 -shaped element group has a light-dark flip-flop property. However, a plurality of swelling swelling elements are regularly arranged at a predetermined pitch, and the swelling element group represents significant information by the first region and the second region in which the area ratios of the swelling elements are different. The second region has a higher area ratio than the first region, and the color layer regularly has a plurality of color elements having a predetermined color at positions superimposed on the latent image element group. It consists of an arranged color element group and a color background portion that is different in color from the color element group and is arranged adjacent to the color element group, and is a region of the color layer having a high brightness superimposed on the first region. The color difference ΔE of adjacent colors at the color boundary in the printed image is 30 or less, which is composed of a shade image representing significant information by the brightness difference of the low brightness region superimposed on the second region. When observing the printed image under diffuse reflected light, the first color image in which the first image and the shade image are combined is visually recognized, and when observing the printed image under normal reflected light, the first color image disappears. , A second color image including a latent image in which a color element group and a latent image element group are combined is visually recognized, and further, when the printed image is observed at different observation angles, the latent image image moves and is visually recognized. It is characterized by that.

Further, in the latent image printed matter of the present invention, in the first color image, the first region of the lightness element group and the region having high brightness of the color layer are superimposed, and the second region of the lightness element group. It is characterized in that the brightness difference of the region where the low brightness region of the color layer is superimposed is 30 or less in L *.

In the present invention, under diffuse reflected light, a first color image in which a shade image of a color layer and a first image of a hump-like element group are combined can be visually recognized, and under normal reflected light, a first color image can be visually recognized. Disappears, a second color image different from the first color image appears, an image change effect appears, and when observing at different observation angles, the latent image included in the second color image moves. Because it produces a dynamic effect that can be visually recognized, it is more discriminating than conventional techniques and has high resistance to counterfeiting.

In the present invention, a colorful image can be expressed by color-coding the image of the color layer with a plurality of colors, and the first color image appearing under diffuse reflected light and the second appearing under normal reflected light can be expressed. Both color images can be freely colored with multiple colors. Therefore, it has become possible to achieve both a moving visual effect and a complicated color expression, which was difficult with the conventional technology.

In order to express a plurality of colors, the latent image printed matter of the present invention does not need to use a glittering material for the semi-cylindrical element group as in the prior art, and is formed by a commercially available general colored ink. Multiple rich colors can be expressed with a group of color elements. In addition, since no special bright pigment is required, the robustness is improved.

The latent image printed matter of this invention is shown. The schematic diagram of the latent image printed matter of this invention is shown. The group of semi-cylindrical elements of the latent image printed matter of the present invention is shown. The latent image element group of the latent image printed matter of this invention is shown. An example of the configuration of the latent image element group of the latent image printed matter of the present invention is shown. The color layer of the latent image printed matter of this invention is shown. A part of the composition of the color layer of the latent image printed matter of the present invention is shown. A part of the composition of the color layer of the latent image printed matter of the present invention is shown. The relationship between the semi-cylindrical element group and the color layer of the latent image printed matter of the present invention is shown. The relationship between the latent image element group and the color layer of the latent image printed matter of the present invention is shown. The layer structure 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.

A mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments as long as it is within the scope of the technical idea in the claims.

The basic configuration of the latent image printed matter (1) in the present invention will be described with reference to FIGS. 1 to 12. FIG. 1 shows a latent image printed matter (1) of the present invention. FIG. 1 is a diagram showing a latent image printed matter (1) of the present invention, wherein the latent image printed matter (1) has a printed image (3) on a base material (2). The base material (2) may have a surface on which the printed image (3) can be formed, and the material is not particularly limited, such as high-quality paper, coated paper, plastic, and metal. In addition, there are no particular restrictions on the color and size of the base material (2).

FIG. 2A shows an outline of the printed image (3). The printed image (3) comprises a color layer (4), a semi-cylindrical element group (5), and a latent image element group (6). FIG. 2 (b) is a view showing a cross-sectional view taken along the line AA'of FIG. 2 (a). The element group (5) and the latent image element group (6) are laminated in this order to form the printed image (3). In the present invention, the first color image (101) visually recognized under diffuse reflected light is composed of a color layer (4) and a group of hump-like elements (5), and a second color image that appears under normal reflected light. (102) is composed of a color layer (4) and a latent image element group (6).

Although the principle will be described later, first, the effect of the latent image printed matter (1) of the present invention will be described with reference to FIG. In the observation under diffusely reflected light as shown in FIG. 12 (a), the color layer (4) and the kamaboko-shaped element group (5) are simultaneously visually recognized by the observer (13), and the first color image (101) is observed. ) And the characters of "JPN" which is the significant information (103) contained therein can be visually recognized.

Subsequently, in the observation under normal reflected light as shown in FIG. 12 (b), the first color image (101) disappears to the observer (13), accompanied by the color of the color layer (4). A second color image (102) including a latent image image (11A, 11B) showing a cherry blossom petal is visible by visualizing a part of the latent image element group (6). Further, in the observation under the specularly reflected light as shown in FIG. 12 (c), when the observation angle is slightly changed from the observation angle of FIG. 12 (b), the latent image image (11A) showing the petals of the cherry blossoms on the upper left is obtained. The latent image (11B) showing the petals of the cherry blossoms in the lower right appears to move in the first direction (S1). The change in the position of the latent image image (11A, 11B) from FIG. 12B to FIG. 12C is continuous, and the color-coded latent image image (11A, 11B) changes with the change in the observation angle. Moves smoothly, creating a moving effect.

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

Further, the "color" in the present invention represents a color including the concepts of hue, saturation and lightness, and the "different color" is different from any one of hue, lightness or saturation. Or, it means that the combination thereof is different.

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

(Kamaboko-shaped element group)
Next, the Kamaboko-shaped element group (5) will be described. FIG. 3 shows an example of the Kamaboko-shaped element group (5). The kamaboko-shaped element group (5) in the present embodiment is a straight line having a predetermined image width, and the kamaboko-shaped element (7) having a shape like a kamaboko having a certain raised height is the first. It is regularly arranged in the direction (S1). In the present invention, "arranged regularly" means a state in which a plurality of elements having a specific shape are arranged in a specific direction at a predetermined pitch.

Further, as shown in the enlarged view of FIG. 3, the kamaboko-shaped element (7) includes a kamaboko-shaped element (7-1, 7-2) having a different area ratio due to a partially different image width. ..

In the first embodiment, the first region (5-1) in which the semi-cylindrical elements (7-1) having the first image width (W1) are regularly arranged and the first. Area of the second region (5-2) in which the semi-cylindrical elements (7-2) having a second image width (W2) having a larger image width than the image width (W1) are regularly arranged. The difference in rates forms the first image (104) representing the alphabet of "JPN" which is significant information (103).

In the present embodiment, the first image (104) is made into a simple binary image by two kinds of kamaboko-shaped elements (7-1, 7-2) having different area ratios, but the image is limited to this. Instead, a multi-gradation image may be formed by using two or more kinds of Kamaboko-shaped elements (7) having different area ratios.

The area ratio must be different between the first region (5-1) and the second region (5-2), but the difference in the area ratio must be kept to 5% or more and 20% or less. .. If it is less than 5%, the increase in brightness under specular reflection is too small, and if it is larger than 20%, the increase in brightness under specular reflection is too large. It will be insufficient.

The "brightness" in the present invention is defined by the CIE1976L * a * b * color system L *. 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.

In the first embodiment, the Kamaboko-shaped element (7) will be described with an example in which the Kamaboko-shaped element (7) is composed of raised Kamaboko-shaped image lines, but the shape of the Kamaboko-shaped element (7) in the present invention is a picture. It is not limited to the shape of the line, and may be configured by a set of pixels, or may be a combination of image lines and pixels.

The "picture line" in the present invention is a dotted line, a broken line, a straight line, a curved line, or a broken line in which halftone dots, which are the smallest units forming a printed image, are continuously arranged in a specific direction for a certain distance. A broken line, etc., and a "pixel" is a circle or triangle that is a collection of at least one printing halftone dot or a plurality of printing halftone dots, a polygon including a quadrangle, various figures such as a star, or characters or symbols. Refers to numbers, etc.

The first image (104) composed of the lightness element group (5) is visually recognized at the same time as the shade image (105) represented by the difference in brightness of the color layer (4) described later under diffuse reflection light. As a result, it is recognized as the first color image (101). Since the kamaboko-shaped elements (7) constituting the kamaboko-shaped element group (5) include the kamaboko-shaped elements (7-1, 7-2) having partially different image widths, each kamaboko-shaped element (7) ), There is always a non-elemental part without a picture line or a pixel, and even if the kamaboko-shaped element (7) has any color and does not have light transmission, the color layer (4) The first image (104) represented by the kamaboko-like element group (5) and the shade image (105) of the color layer (4) are displayed to the observer under diffused reflected light because the image is not completely concealed. The combined first color image (101) is visually recognized. Therefore, the kamaboko-shaped element (7) constituting the kamaboko-shaped element group (5) may be transparent, translucent, or colored. However, when it is deeply colored, it may be difficult to eliminate the first image (104) only by increasing the brightness of the kamaboko-like element (7) under the specular reflection light described later. When coloring the shape element (7), it is necessary to keep the color density so that the overlapping color layers (4) can be seen through and maintain the light transmittance in order to ensure the disappearance effect at the time of specular reflection. desirable.

The kamaboko-like element (7) needs to be composed of a material containing a resin. The resin referred to here refers to a resin having a certain gloss, which corresponds to a varnish component of general printing inks such as urethane resin, acrylic resin, alkyd resin, epoxy resin, polyester resin, and phenol resin. A configuration in which irregularities are directly formed on the base material (2) by punching, embossing, or the like does not satisfy the essential requirements of the present invention. Since the present invention does not utilize the lens effect of the semi-cylindrical element (7), there is no limitation on the refractive index of the resin or the like.

The semi-cylindrical element (7) needs to have a light-dark flip-flop property in which the lightness increases at the time of specular reflection. Further, it may have a color flip-flop property in which the hue changes at the same time. Since the height of the reflected light generated during specular reflection of the gambling element (7) and the magnitude of the color difference at the time of hue change are directly linked to the height of the gradation expression range of the latent image, the amount of reflected light of the gambling element (7). It is preferable that the hue difference between the hue under diffusely reflected light and the hue under specularly reflected light is large.

The "color difference" in the present invention is defined by ΔE of the CIE1976L * a * b * color system. The color difference is the distance in the color space of two colors, and the color difference in the CIE1976L * a * b * color system is the difference between the two colors L *, the difference a *, and the difference b *. It can be calculated by adding the squares of each and taking the square root. In this specification, achromatic colors such as white, gray, and black are also considered as one color.

The light-dark flip-flop property is an optical characteristic that can be easily provided by using a varnish of a general printing ink such as a urethane resin, an acrylic resin, an alkyd resin, an epoxy resin, a polyester resin, or a phenol resin. Further, in order to impart color flip-flop property, it is necessary to blend a special functional material into the ink, and as these functional materials, there are pearl pigments, metallic pigments, glass flakes, effect pigments and the like. Examples of the functional ink include OVI (Optical Variable Ink), CSI (Color Shifting Ink), and cholesteric liquid crystal ink. However, since the color expression of the present invention is an effect that does not depend on the color change due to the color flip-flop property, excellent color flip-flop property is not always necessary, and water-repellent / oil-repellent treatment such as perfluoroalkyl phosphoric acid treatment is performed. There is no need to apply. Basically, if the Kamaboko-shaped element group (5) has a light-dark flip-flop property, sufficient color expression is possible.

The height of the raised line of the Kamaboko-shaped element (7) is not particularly limited, but it is not desirable to have a height of 1 mm or more in consideration of distribution suitability. Further, when the kamaboko-shaped element (7) is formed by ink and the thickness of the film is 3 μm or less, the moving image effect of the latent image may be low. Therefore, when the kamaboko-shaped element (7) is formed by an ink film, it is preferably 3 μm or more and 1 mm or less.

When forming the Kamaboko-shaped element group (5), the means thereof is not particularly limited as long as a certain swelling height can be formed. When forming by printing, screen printing, concave printing, gravure printing, flexographic printing, etc. are suitable, but offset printing, letterpress printing, etc. are not suitable. Further, there is no problem even if the ink is thickly piled up with an ink jet or a laser type printer to form the kamaboko-shaped element group (5). The above is the explanation of the Kamaboko-shaped element group (5).

(Latent image element group)
Subsequently, the latent image element group (6) will be described with reference to FIG. Here, the configuration is configured to include two latent image element groups (6), and the description will be centered on the latent image element group (6B) at the lower right. The latent image element group (6) is formed by processing the basic image (8), which is the source of the latent image image appearing at the time of specular reflection, by the method described in JP-A-2016-203459. Specifically, the base image (8) is cut out with a certain width in the first direction (S1) with respect to the base image (8), and compressed in the first direction (S1) at a specific reduction ratio. Then, one latent image element (9) is produced. While shifting the position where the base image (8) is cut out at the same pitch (P1) in the first direction (S1), the latent image elements (9) are produced in order by repeating compression from the cutout, and each latent image element (9) is produced. By arranging 9) in the first direction (S1) at the same pitch (P1), the latent image element group (6B) can be produced. In the first embodiment, the latent image element group (6B) was prepared using the cherry blossom petals shown in FIG. 4 as the base image (8). By adopting this configuration, the petals of cherry blossoms appear to move in the first direction (S1).

In the latent image element group (6B), the latent image element (9) having a constant image width (W3) is in the same first direction (S1) as the kamaboko-shaped element group (5), and the kamaboko-shaped element group (5). ) And at the same pitch (P1), they are regularly arranged. The adjacent latent image elements (9) have different shapes from each other. The difference between the latent image element group (6A) on the upper left and the latent image element group (6B) on the lower right is that the position of the latent image element group (6B) is used as a reference in the first direction (S1). It is arranged at a position separated by "a multiple of P1 + a half of P1". By arranging the "half of P1" out of phase in the first direction (S1), the positional relationship of the kamaboko element group (5) with respect to the peaks and valleys is reversed, so that a moving image effect is generated. In some cases, the effect of reversing the direction of movement can be obtained. If the effect of reversing the direction of movement is not required, it is not necessary to shift the phase to the first direction (S1) by "1/2 of P1", and only "a multiple of P1" is the first. The phases may be shifted in the direction (S1). In addition, the fact that the phase is shifted in the vertical direction is merely a design consideration, not a technical requirement.

When the latent image element group (6) is formed by the above configuration, the latent image image (11A) generated from the upper left latent image element group (6A) is the lower right latent image element group when observed under specularly reflected light. The moving direction is opposite to that of the latent image image (11B) generated from (6B).

The configuration of the latent image element group (6) is not limited to this, and if it is desired to further simplify the movement and configuration of the latent image image, the method described in Japanese Patent No. 5200284 may be used. .. The method described in Japanese Patent Application Laid-Open No. 2016-203459 is a further development of the method described in Japanese Patent No. 5200284.

As shown in FIG. 4, the base image (8) in the present embodiment is an image in which the petals of cherry blossoms are represented by contour lines (14), and the latent image element group (6) is based on this base image (8). It is composed. This is a device for enhancing the contrast of the latent image image (11A, 11B) with respect to the surroundings under specularly reflected light, and for vividly expressing the internal color of the latent image image (11A, 11B). That is, by the interference between the latent image element group (6) and the scab-like element group (5), only the contour line (14) appears along the color boundary of the color layer (4) described later. While increasing the contrast of the latent image images (11A, 11B), the colors inside the latent image images (11A, 11B) that appear are expressed by the vivid colors arranged in the color layer (4). For this reason, the contrast between the latent image image (11A, 11B) and the surrounding background is maintained by the dark contour line (14), even though the latent image image is expressed with vivid colors, which was impossible in the past. be able to.

If color expression is not emphasized in the design, the inside of the latent image element group (6) may be painted with a lighter color than the outside of the latent image element group (6) as shown in FIG. 5 (a). As shown in FIG. 5B, there is no problem even if the outside of the latent image element group (6) is painted with a lighter color than the inside of the latent image element group (6). This configuration is one of the effective methods when the contrast of the latent image is more important than the color expression. What is important in this technique is to express the latent image element group (6) by emphasizing at least the contour line (14), and to fill or blur the inside or outside of the latent image element group (6). Etc. may be used according to the expression desired by the user.

The latent image element group (6) needs to have at least light transmission, and is preferably transparent. In the case of coloring, it is necessary to keep the color so pale that it is invisible in the first color image (101).

Further, in the present invention, when strong light is incident, the latent image element (9) suppresses the strong reflected light generated from the semi-cylindrical element (7), so that the latent image images (11A, 11B) are expressed. be. Therefore, in order to obtain a certain degree of visibility, a color difference of at least 10 or more of a color difference ΔE is required between the latent image element (9) and the semi-cylindrical element (7) under normal reflected light. In many cases, the kamaboko-shaped element (7) has a high-gloss configuration, and therefore it is desirable that the latent image element (9) has a relatively low gloss than the kamaboko-shaped element (7). That is, it is desirable to have a configuration in which the brightness of the semi-cylindrical element (7) is high and the brightness of the latent image element (9) is low at the time of specular reflection. Therefore, when printing the latent image element group (6), it is preferable to use a transparent matte ink.

Unlike the Kamaboko-shaped element group (5), the latent image element group (6) does not require a raised height, and may be formed by highly productive offset printing, letterpress printing, or the like. It can also be formed by a printer such as an ink jet or a laser printer. When forming a latent image element group (6) with a printer, variable printing is possible in which the latent image images given one by one are different, which is ideal for giving personal information such as a resident's card or a passport. ..

Here, the configuration of the latent image element group (6) is described with an image representing two cherry blossom petals, but the present invention is not limited to this, and the latent image element group (6) is matched to the latent image image to be expressed. It may be set appropriately. The above is the description of the latent image element group (6).

(Color layer)
Subsequently, the color layer (4) will be described. FIG. 6 shows the color layer (4). The colors included in the color layer (4) are colors that color the first color image (101) appearing under diffuse reflected light and the second color image (102) appearing under normal reflected light. At least a part of the color layer (4) needs to be colored with a color different from that of the base material (2), and the color of the color layer (4) may have a plurality of different hues. desirable.

The color layer (4) has a region with high lightness (4A) and a region with low lightness (4B), and is a shade image representing the characters of "JPN" which is significant information (103) by the difference in lightness. 105) is formed. In the present embodiment, the high-brightness region (4A) is a region that is not "JPN", and the low-brightness region (4B) is a "JPN" region.

The adjacent high-brightness region (4A) and low-brightness region (4B) are composed of the same hue and have different lightness. Specifically, in the present embodiment, the color layer (4) is represented by two hues, that is, the petals of cherry blossoms are pink and the background is light blue, but within the region of "JPN" which is a region of low lightness (4B). The pink and light blue are composed of a region having a high lightness (4A), which is not "JPN", and has a lower lightness (deeper density) than the pink and light blue.

Further, as shown in FIG. 7, the color layer (4) includes a color element group (4C-1, 4C-2) configured based on the same basic image (8) as the latent image element group (6). It has a color background portion (4D) adjacent to the color element group (4C-1, 4C-2). Further, the color layer (4) needs to be color-coded based on the contour of the color element group (4C-1, 4C-2). This is a positive or negative image as shown in FIGS. 5 (a) and 5 (b) even if the latent image element group (6) is composed of the contour line (14) as shown in FIG. The same applies even if it is composed of such as.

As described above, in the color layer (4) shown in FIG. 7, the color element group (4C-1) showing the cherry blossom petals on the upper left and the color element group (4C-2) showing the petals of the cherry blossoms on the lower right are pink. The color background portion (4D) serving as the background image is light blue. In the color layer (4), the boundaries color-coded by each color are called "color boundaries". Hereinafter, the specific image line configuration of the color layer (4) will be specifically described.

The color element group (4C-1, 4C-2) is basically configured by the same method as the latent image element group (6). That is, by cutting out the base image (8) with a certain width in the first direction (S1) with respect to the base image (8) and compressing it in the first direction (S1) at a specific reduction ratio, one Two color elements (10) are made. While shifting the position where the base image (8) is cut out in the first direction (S1) at the same pitch (P1), the color elements (10) are produced in order by repeating compression from the cutout, and each color element (10) is produced. The color layer (4) can be produced by arranging the above in the first direction (S1) at the same pitch (P1) and arranging them in the background color background portion (4D). The colors of the color elements (10) may be added at the stage of dividing and compressing the base image (8), or may be added at the stage of forming the color layer (4). Basically, the color element group (4C-1, 4C-2) having the same shape as the latent image element group (6) and given color is arranged in the background color background portion (4D). It is a color layer (4). The arrangement position of the color element group (4C-1, 4C-2) in the color layer (4) and the arrangement position of the corresponding latent image element group (6A, 6B) are the same when they are superimposed. It is desirable that at least the center position in the first direction (S1) is the same.

It is the color layer (4) that has the effect that the significant information (103) seen in the first color image (101) under diffusely reflected light disappears under specularly reflected light, which is the effect of the present invention. This is due to the superposition of the Gamo-like element group (5).

As shown in FIG. 9, the shade image (105) represented by the difference in lightness of the color layer (4) is the first image (104) represented by the difference in the area ratio of the Kamaboko-shaped element group (5). And, the significant information (103) of the same size is represented by each other, and they are in an overlapping relationship at the same position. That is, the first region (5-1) of the Kamaboko-like element group (5) composed of a low area ratio overlaps with the region (4A) having high brightness in the color layer (4), and the brightness is increased. The lower region (4B) overlaps with the second region (5-2) of the Kamaboko-like element group (5), which is composed of a high area ratio.

Since the Kamaboko-shaped element group (5) has a light-dark flip-flop property, the lightness increases during specular reflection. Since the rate of increase in brightness is proportional to the level of the area ratio of the Kamaboko element group (5), the rate of increase in brightness in the first region (5-1) composed of the low area ratio is relatively low. The rate of increase in brightness in the second region (5-2) composed of a high area ratio is relatively high. Of the color layers (4), the first region (5-1) overlaps with the high-brightness region (4A), and the second region (5-2) overlaps with the low-brightness region. Since it is (4B), when each is configured with an appropriate brightness, the brightness of these two regions becomes visually equal at the time of specular reflection, and the significant information (103) in the color layer (4). ) Is visually disappeared.

In order to realize the above-mentioned disappearance effect, in the first color image (101) represented by the overlapping of the color layer (4) and the kamaboko-shaped element group (5), the first region (5-1) is used. The difference in brightness between JPN, which is significant information (103) represented by the second region (5-2) and the region with high brightness (4A) and the region with low brightness (4B), and the other regions is within an appropriate range. Need to be configured. In the case of superimposing the color layer (4) and the lightness element group (5), "the first region (5-1) superimposed on the high lightness region (4A)" and "the low lightness region (4B)". The difference in brightness of the "overlapping second region (5-2)" needs to be 30 or less in L * in the first color image (101), and more preferably 20 or less in L *. Is preferable. If the Kamaboko-shaped element group (5) is transparent and uncolored, the difference in brightness between the high-brightness region (4A) and the low-brightness region (4B) of the color layer (4) is 30 in L *. It needs to be as follows, and more preferably, it is formed as 20 or less in L *.

Further, in the present invention, in the second color image (102) appearing under normal reflected light, the latent image images (11A, 11B) color-coded by a plurality of colors appear to move along the contour line (14). The effect is that the color boundaries in the color layer (4) move in perfect synchronization with the contour lines (14) represented by the light and shade generated from the latent image element group (6). Occurs. In order to obtain the effect that the boundary of colors in the color layer (4) moves in synchronization with the contour line (14) generated from the latent image element group (6), the boundary of each color in the color layer (4) is obtained. Needs to be painted in a shape similar to the latent image element group (6) that overlaps on top.

When emphasizing the moving image effect under specular light, it is most desirable to match the shape of the overlapping latent image element group (6) with the color boundary in the color layer (4) as shown in FIG. It is a composition. In FIG. 10, the area where the upper left latent image element group (6A) is arranged is the area where the upper left color element group (4C-1) in the color layer (4) is arranged, and the lower right latent image element group (6B). ) Is arranged in the area where the lower right color element group (4C-2) in the color layer (4) is arranged.

It should be noted that the portion not related to the contour of the latent image element group (6) may be color-coded to provide a color boundary in the color layer (4), but the portion is simply color-coded even under specular reflected light. There is no moving image effect at the boundary of the colors. Further, if there is a design reason, a portion corresponding to the outline of the latent image element group (6) may not be provided with a color boundary and may be intentionally provided with a portion that is not color-coded. However, in that part, only a single color is visually recognized even under specularly reflected light, and a plurality of different colors cannot be expressed.

In the present embodiment, the color boundary in the color layer (4) has a configuration that completely matches the shape of the latent image element group (6) that overlaps the color layer (4), but is not limited to this. Even when a color boundary in the color layer (4) is formed with a structure slightly different from the shape of the latent image element group (6), there is a structure in which the moving image effect, which is the effect of the present invention, is produced. A form in which the latent image element group (6A, 6B) and the color element group (4C-1, 4C-2) are formed with substantially the same shape and the same size, that is, the form in which the effect of the present invention is produced, that is, , The color arrangement in the color layer (4) including the color boundary is defined as "the color arrangement having a high shape correlation with the shape of the latent image element group (6)". The color arrangement referred to here includes not only the shape and positional relationship of fine coloring of colors at the boundary of colors, but also the shape and positional relationship of all colorings in the entire color layer (4). The shape of the latent image element group (6) and the color arrangement having a high shape correlation are as described in Japanese Patent Application Laid-Open No. 2019-126977.

Next, the color limitation of the color layer (4) will be described. Actually, the color limitation is mainly due to the difference in hue in the printed image (3), but since the main color of the printed image (3) is determined by the color layer (4), the color layer (4) At the stage of color design, it is necessary to consider the color to be applied at the boundary of colors. When colors having too large a color difference are adjacent to each other and arranged as adjacent colors at the boundary of colors, the effect of the present invention does not occur or the effect is significantly reduced. An excessively large color difference between adjacent colors in the color layer (4) cancels out the contrast between light and dark produced by the latent image element group (6), and thus works to eliminate or greatly reduce the effect of the present invention. For example, when extremely deep red and perfect white are placed next to each other at the boundary of colors, the effect of the present invention does not occur no matter how devised the composition of the latent image element group (6) and the color layer (4). Therefore, it is necessary to keep the colors adjacent to each other at the boundary of colors within a certain range of color difference.

As a specific numerical value, the color difference at the boundary of colors in the completed state as the printed image (3) needs to be 30 or less in ΔE. More specifically, the color boundary of the printed image (3) is completed as the printed image (3) by overlapping the color layer (4), the gem-shaped element group (5), and the latent image element group (6). When the adjacent colors are measured from above the printed image (3), the color difference between them needs to be 30 or less in ΔE. In the present technology, since the scab-like element group (5) may be colored, it is affected by the color of the stalk-like element group (5), and the colors adjacent to each other at the boundary of the color of the color layer (4) alone. Since the color difference in the case of the printed image (3) and the color in the case of the printed image (3) are significantly different, in the present invention, it is defined by the adjacent colors at the boundary of the colors in the case of the printed image (3).

When the adjacent colors measured from the printed image (3) have a color difference ΔE of more than 30, no matter what material is used, the effect of the present invention does not occur. When the scabbard element group (5) is formed by printing using general printing paper, the present invention is performed by forming a color difference ΔE of adjacent colors at the color boundary on the printed image (3) at 30 or less. The effect of can occur.

However, even if the colors are included in the printed image (3), there is no problem even if the color difference ΔE exceeds 30 as long as they are not adjacent to each other at the boundary of the colors. What is important in the color design of the color layer (4) of the present invention is that the color difference ΔE between adjacent colors adjacent to each other at the color boundary in the printed image (3) does not exceed 30. Therefore, it goes without saying that if the gradation in which the colors gradually change is effectively utilized, the color difference between adjacent colors can be reduced and the color expression range that can be expressed in the printed image (3) can be expanded.

As already shown in FIGS. 6, 7 and 8, the high-brightness region (4A) and the low-brightness region (4B) in the color layer (4) are the color element groups (4C-1, 4C-2, respectively). ) Or the color background part (4D). The color elements (4C-1, 4C-2) and the color background (4D) have different colors including the hue (light blue and pink in the present embodiment), but even if the hues are different from each other. The difference in brightness between the high-brightness region (4A) and the low-brightness region (4B) needs to be configured to be substantially equal. Specifically, in the present embodiment, the light blue, which is the color of the color background portion (4D), has a lightness difference of 15 in L * between the high lightness region (4A) and the low lightness region (4A). In this case, the difference in brightness of pink, which is the color of the color element group (4C-1, 4C-2), is also designed to be about 15 in L *. That is, regardless of the difference in hue between the color element group (4C-1, 4C-2) and the color background portion (4D), the high-brightness region (4A) and the low-brightness region (4B) have substantially the same brightness. It is necessary to make a difference. The above is the description of the color limitation of the color layer (4).

Similar to the latent image element group (6), the color layer (4) may be formed by highly productive offset printing, letterpress printing, or the like. It can also be formed by a printer such as an ink jet or a laser. When it is formed by a printer, it is possible to perform variable printing in which the latent image images given one by one are different, which is most suitable for giving personal information such as resident's card and passport. The above is the description of the color layer (4).

Subsequently, the stacking order of the latent image printed matter (1) of the present invention will be described with reference to FIG. Based on the base material (2), a color layer (4) is first formed, a semi-cylindrical element group (5) is formed on the color layer (4), and a latent image element group (6) is formed on the color layer (6). show. Alternatively, a form in which a kamaboko-shaped element group (5) is printed, a latent image element group (6) is overlaid on the printing element group (6), and a color layer (4) is overlaid on the latent image element group (6) is printed (not shown). But it may be. Alternatively, a color layer (4) may be formed on the Kamaboko-shaped element group (5), and the latent image element group (6) may be overlaid and printed (not shown). Basically, as long as the latent image element group (6) is formed above the kamaboko-shaped element group (5), there is no problem in imparting the color layer (4) to any layer. The above is the stacking order of the latent image printed matter (1) of the present invention.

Subsequently, the effect of the latent image printed matter (1) of the present invention will be described with reference to FIG. In the observation under so-called diffuse reflection light, where the incident angle of the light incident from the light source (12) and the reflection angle of the light reflected from the latent image printed matter (1) are significantly different as shown in FIG. 12 (a), the observer ( From 13), the color-coded color layer (4) and the hump-like element group (5) are visually recognized at the same time, and the first color image (101) and the significant information (103) contained therein are "JPN". The characters are visible. In addition, although it is difficult to distinguish because the significant information (103) attracts attention, the cherry blossom pattern represented by the difference in color in the color layer (4) can be slightly visually recognized.

Subsequently, in observation under so-called normal reflected light, as shown in FIG. 12B, the incident angle of the light incident from the light source (12) and the reflection angle of the light reflected from the latent image printed matter (1) are almost the same. The observer (13) cannot see "JPN" which is the significant information (103) of the first color image (101), and the color of the color layer (4) is accompanied by the color of the latent image element group (6). A second color image (102) including a latent image (11A, 11B) showing the petals of cherry blossoms, which is partially visualized, can be visually recognized. Specifically, latent image images (11A, 11B) representing pink cherry blossom petals can be visually recognized in the light blue color background portion (4D). Further, in the observation under the specularly reflected light as shown in FIG. 12 (c), when the observation angle is slightly changed from the observation angle of FIG. 12 (b), the latent image image (11A) showing the petals of the cherry blossoms on the upper left and the right. The position of the latent image (11B) showing the petals of the cherry blossoms below appears to change. The change in position from FIG. 12 (b) to FIG. 12 (c) is continuous, and the color-coded latent image images (11A, 11B) move smoothly as the observation angle changes, which is a moving effect. Occurs.

The principle of producing the above effects will be described. First, the principle that the first color image (101) is visually recognized under diffuse reflected light as shown in FIG. 12A will be described. Of the color layer (4), the scab-like element group (5), and the latent image element group (6), the latent image element group (6) has no object color, so the color layer (4) and the scab-like element The first color image (101), which is a composite image of the group (5), can be visually recognized. In the color layer (4) and the Kamaboko-shaped element group (5), "JPN", which is significant information (103) composed of the lightness difference, exists and is recognized by the observer with the lightness difference.

Further, under the specularly reflected light as shown in FIGS. 12 (b) to 12 (c), the Kamaboko-shaped element group (5) reflects the light, so that the brightness is increased. Here, "a region where the high-brightness region (4A) of the color layer (4) and the first region (5-1) having a low area ratio of the lightness element group (5) overlap" and "the color layer (4)". The first is that the colors of the "region where the low-brightness region (4B) and the second region (5-2) with a high area ratio of the lightness element group (5) overlap" are approximately equal due to the positively reflected light. The difference in brightness of "JPN", which is the significant information (103) in the color image (101), is lost, and it seems that it has disappeared visually. Further, of the image surface of the bulging swelling element (7), only the surface of the image orthogonal to the incident light strongly reflects the light, and the information of the latent image element (9) superimposed on it is sampled. It produces bright and dark light (the part without the latent image element (9) is bright, and the part with the latent image element (9) is dark), and the latent image element group (6) as a whole is composed of contour lines (14). The latent image images (11A, 11B) are visualized. As shown in FIGS. 12 (b) to 12 (c), when the angle is changed under specular reflected light, the position of the image line surface orthogonal to the incident light in the image line surface of the kamaboko-shaped element (7). As a result, the information of the sampled latent image images (11A, 11B) changes, and as a result, the position of the contour line (14) changes and is visually recognized. Further, as the contour line (14) composed of light and dark moves, the pink color arranged in the color layer (4) also appears to move in the light blue of the color background portion (4D). It should be noted that the effect that the color boundary of the color layer (4) under the Kamaboko-shaped element group (5) also appears to move in synchronization with the shape of the latent image is an illusion of the observer and occurs optically. It's not a phenomenon. This phenomenon is described in JP-A-2019-126977.

In the description of the present embodiment, what is applied to the latent image element group (6) and the color layer (4) is a configuration in which the moving image effect described in JP-A-2016-203459 is produced. The configuration for achieving this is not limited to this. As a configuration for realizing the moving image effect, a simpler configuration of Japanese Patent No. 5200284 may be used. This is an image composition that produces a moving image effect of the integral photography method. It is also possible to apply a configuration that realizes a moving image effect by a flip book method, mainly with a continuous change effect. For example, as in the techniques described in Japanese Patent No. 4682283 and Japanese Patent Application Laid-Open No. 2016-221889, it is possible to apply a configuration that realizes a moving image effect by changing symbols that are related to each other one after another.

However, the effect that the color boundary of the color layer (4) appears to move, which occurs in the present invention, is not actually sampled by surface reflection or refraction, but is a phenomenon caused by an illusion. It cannot be diverted to the image composition of these technologies as a condition. For example, it is difficult to give an effect that the color boundary of the color layer (4) appears to move in synchronization with the effect of changing the latent image from “A” to “B”. This is because it is difficult for the illusion to work on dramatic and clear changes in the latent image.

The effect of the present invention can be highly exhibited by the moving image effect of the integral photography method and the moving image effect applying the change effect of the flip book method. In particular, it is important not to design the range of movement of the latent image to be excessively large in order to enhance the effect of the present invention. In order to realize the moving image effect by the flip book method using the color layer (4), the method described in JP-A-2019-126977 may be used.

Further, in the description of the present embodiment, each element constituting the kamaboko-shaped element group (5) is formed by a picture line, but the present invention is not limited to this. Regarding the configuration when the scab-like element (7) and the latent image element (9) are pixels instead of strokes, Japanese Patent No. 4660775, Japanese Patent No. 4682283, Japanese Patent No. 5200284, Japanese Patent No. 6075244 And the configuration described in Japanese Patent No. 612882 may be used. Further, when the kamaboko-shaped element (7) and the latent image element (9) 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. .. Along with this, the color layer (4) may be color-coded at the boundary of colors according to the shape of each element represented by the latent image element group (6). As described above, the shapes of the color layer (4), the semi-cylindrical element group (5), and the latent image element group (6) are not limited, and are latent on the conventional semi-cylindrical element (5). The configuration used in the technique of superimposing the image element group (6) to express a latent image can be used as it is.

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

(Example)
Examples will be described with reference to the example of the latent image printed matter (1) described in the embodiment. Specifically, it will be described with reference to FIGS. 1 to 12 as in the embodiment. FIG. 1 shows a latent image printed matter (1) of an embodiment. The latent image printed matter (1) has a printed image (3) composed of pink and light blue colors on a base material (2). As the base material (2), general finely coated paper (made by Gladios CC Nippon Paper Industries) was used.

FIG. 2 shows an outline of the printed image (3). The printed image (3) is formed by superimposing a transparent kamaboko element group (5) on a color layer (4) composed of pink and light blue colors, and further superimposing a latent image element group (6) on it. ..

FIG. 3 shows a Kamaboko-shaped element group (5). The kamaboko element group (5) is a first group in which the kamaboko elements (7-1) forming a straight line having a width of 0.27 mm are continuously arranged in the first direction (S1) at a pitch of 0.4 mm. A second region in which a region (5-1) and a semi-cylindrical element (7-2) forming a straight line having a width of 0.31 mm are continuously arranged in the first direction (S1) at a pitch of 0.4 mm. (5-2) was used to construct the character "JPN" which is the significant information (103). The Kamaboko-like element group (5) is transparent.

FIG. 4 shows a latent image element group (6). The latent image element group (6) includes a first latent image element group (6A) and a second latent image element group (6B). The base image (8) was made up of cherry blossom petals, and the latent image element group (6) was composed of compressed images of the integral photography method. The compression ratio compressed from the basic image (8) to the latent image element (9) was set to 4% (the smaller the numerical value, the more compressed the basic image). The position of the first latent image element group (6B) in the first direction (S1) is a multiple of P1 with respect to the position of the first latent image element group (6A) in the first direction (S1). It was arranged with a phase shift of 12.2 mm, which corresponds to (12 mm) + 1/2 (0.2 mm) of P1.

FIG. 6 shows the color layer (4). The color element group (4C-1, 4C-2) has the same configuration as the latent image element group (6), and the compression ratio of the cherry blossom petals of the base image (8) is set to 4%, along the boundary of colors. Color-coded as it is. Similar to the embodiment, the petals of the color element group (4C-1) representing the cherry blossoms on the upper left and the color element group (4C-2) representing the cherry blossoms on the lower right are formed in pink, and the other color background portion (4C-2). 4D) was formed in light blue. In addition, the characters "JPN" were expressed as significant information (103) in the high-brightness region (4A) and the low-brightness region (4B) in the color layer (4). Other specific configurations of the printed image (3), the semi-cylindrical element group (5), the latent image element group (6), and the color layer (4) are the same as those in the embodiment.

First, the color layer (4) was printed on the base material (2) with a color laser printer. The printer used was IPSIO manufactured by RICOH. The pink color was magenta 18% and yellow 10%, and the light blue color was cyan 10% and black 5%. The color difference ΔE between pink and light blue was about 20. In addition, the difference in brightness between the high-brightness region (4A) and the low-brightness region (4B) in pink and light blue was 15 in L *.

Subsequently, the Kamaboko-shaped element group (5) was formed by UV-drying screen printing. What was used was a transparent screen ink (made by UVTUB-000 Teikoku Printing Inks Co., Ltd.). Printing was performed on the color layer (4) using this ink. The height of each kamaboko-shaped element (7) was about 15 μm. Further, the latent image element group (6) was formed on the semi-cylindrical element group (5) by wet offset printing using a low-gloss gray ink (made by UVL special training P420C matte gray T & K TOKA).

The effect of the latent image printed matter (1) of the embodiment will be described with reference to FIG. Under diffusely reflected light as shown in FIG. 12 (a), the observer (13) divides the image showing the petals of cherry blossoms, which are color-coded in pink and blue along the contour line (14), by the difference in brightness. The first color image (101) representing the characters of "JPN", which was the significant information (103), could be visually recognized. Subsequently, in the observation under the specularly reflected light as shown in FIG. 12 (b), the character "JPN", which is the significant information (103) classified by the difference in brightness, disappears, and the observer (13) is pink. The second color image (102) in which the latent image images (11A, 11B) representing the petals of the cherry blossoms were visualized together with the light blue background could be visually recognized. Further, when the observation is performed at a slightly different angle from the observation angle of FIG. 12 (b), as shown in FIG. 10 (c), the latent image images (11A, 11B) showing the cherry blossoms color-coded in pink are on the light blue background. The position changed along the first direction inside. The change in position from FIG. 12 (b) to FIG. 12 (c) is continuous, and the pink latent image images (11A, 11B) move smoothly in the light blue background as the observation angle changes. It was confirmed.

1 Latent image Printed matter 2 Base material 3 Printed image 4 Color layer 4A High-brightness area 4B Low-brightness area 4C-1, 4C-2 Color element group 4D Color background part 5 Kamaboko-like element group 5-1 First area
5-2 Second region 6, 6A, 6B Latent image element group 7, 7-1, 7-2 Latent image element 8 Group image 9 Latent image element 10, 10'Color element 11A, 11B Latent image image 12 Light source 13 Observer 14 Contour line 101 First color image 102 Second color image 103 Significant information 104 First image 105 Shading image

Claims (2)

A printed image formed by laminating a latent image element group, a semi-cylindrical element group, and a color layer is provided on at least a part of a base material.
The latent image element group is laminated on a layer above the kamaboko-shaped element group, has light transmission property, and is composed of a plurality of latent image elements obtained by dividing or compressing a basic image at a regular pitch.
The kamaboko-shaped element group has a light-dark flip-flop property, and a plurality of kamaboko-shaped elements having swelling are regularly arranged at a predetermined pitch, and the kamaboko-shaped element group has an area ratio of the kamaboko-shaped element. It has a first image showing significant information by different first and second regions, the second region having a higher area ratio than the first region.
The color layer includes a color element group in which a plurality of color elements having a predetermined color are regularly arranged at a position superimposed on the latent image element group, and the color element group having a different color from the color element group and the color element. It consists of a color background portion arranged adjacent to the group, and is the difference in brightness between the high-brightness region superimposed on the first region and the low-brightness region superimposed on the second region of the color layer. It consists of a shade image showing the significant information.
In the printed image, the color difference ΔE of adjacent colors at the boundary of colors is 30 or less.
When the printed image is observed under diffuse reflection light, the first color image in which the first image and the shading image are combined is visually recognized.
When the printed image is observed under normal reflected light, the first color image disappears, and a second color image including the latent image in which the color element group and the latent image element group are combined is visually recognized. Further, the latent image printed matter is characterized in that when the printed image is observed at different observation angles, the latent image image moves and is visually recognized.
In the first color image, the first region of the lightness element group and the high-brightness region of the color layer are superimposed, and the second region and the color layer of the lightness element group are superimposed. A latent image printed matter having a brightness difference of 30 or less in L * in a region where the low-brightness regions are superimposed.

Images