JP5900821B2 - Latent image printed matter - Google Patents

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports that require anti-counterfeiting, the present invention can observe the first significant information under normal observation conditions. The present invention relates to a latent image printed matter in which second significant information appears under viewing conditions.

  Recent advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce elaborate copies of precious printed matter. For this reason, in order to prevent duplication and counterfeiting as described above, anti-counterfeiting techniques that cannot be reproduced by printers and copiers have been developed and proposed.

  Among these anti-counterfeiting techniques, a visible image can be visually recognized when observed under normal observation conditions, and the visible image disappears when observed under different observation conditions, resulting in a different latency from the visible image. There is a technique that can authenticate an authenticity of an image by authenticating a so-called image change effect. These technologies are excellent in authenticity due to dramatic image changes, and in order to imitate the effect, it is necessary to use a more advanced line composition, so it is possible to improve authenticity and counterfeit resistance. It is considered an excellent technology.

  The present applicant has already been able to observe the same color under the observation conditions under visible light, but the ink having a different color relationship under the observation conditions under a specific wavelength band is used as a pair ink, and a special halftone dot configuration or A printed matter configured with a line configuration, and an image that can be viewed under viewing conditions under visible light and an image that can be viewed under viewing conditions under a specific wavelength band can be viewed as different images having no correlation at all. An application has been filed for an invention relating to a latent image printed material having an image change effect (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Japanese Patent No. 3544536 Japanese Patent No. 4461234 Japanese Patent No. 4444132

  Although the techniques described in Patent Document 1, Patent Document 2, and Patent Document 3 are different in image line configuration itself, the basic concept is the same, and they are the same color under observation conditions under visible light. It is a technology that uses two inks that change to different colors under the observation conditions under the wavelength band as a pair ink, and forms a latent image with the first ink that is visualized under the observation conditions under the specific wavelength band. In this technique, a latent image is camouflaged with a second ink that becomes invisible under observation conditions under a specific wavelength band and is hidden in the visible image. These techniques have the feature that the authenticity determination method can be freely selected according to the characteristics of the two inks to be paired. For example, if ink that absorbs infrared light and ink that does not absorb are paired ink, it becomes a printed matter that determines authenticity by infrared light, and if ink that emits light when excited by ultraviolet light and ink that does not excite light are paired ink, it is true by ultraviolet light. Since it is a printed matter that makes a false determination, it is possible to configure a printed matter that has a changing effect according to the authenticity determination method requested by the customer.

  However, in most cases, these techniques have a problem that the authenticity determination method is limited to one method. For example, although printed matter using the characteristics of ultraviolet light-emitting ink and infrared absorbing ink is excellent in authenticity and convenience, a mechanism that exhibits a similar effect is already known, and its counterfeit resistance is reduced. It's getting on. Therefore, there is a risk that a technique that has only the authenticity determination method using the characteristics of the ultraviolet light emitting ink and the infrared absorbing ink is easily counterfeited. In order to cope with such a problem, a technique including a plurality of authenticity determination methods that include another new authentication method in addition to the conventional authentication method has been desired.

  In addition, the techniques described in Patent Documents 1 to 3 perform true / false determination under specific observation conditions. For example, a printed material that performs true / false determination with infrared rays uses a dedicated authenticity determination device such as an infrared viewer. Necessary and authenticity of printed matter with ultraviolet rays requires a light source that irradiates ultraviolet rays, but users who do not have such devices or means cannot naturally judge the authenticity of printed matter was there. Accordingly, it has been desired that one of the authenticity determination methods included in the valuable printed material is a method that allows anyone to easily determine authenticity without using tools or devices.

  The present invention aims to solve the above-mentioned problems, and can determine true / false under a plurality of observation conditions different from normal observation conditions, and one of the plurality of true / false determination means includes: It is possible to provide a latent image printed material that is more excellent in authenticity discrimination and anti-counterfeiting effects by allowing a latent image to be viewed by tilting and observing without using tools or devices.

  The latent image printed matter of the present invention has a printed image on at least a part of a substrate, and the printed image is composed of an information portion, a background portion, and a reflective layer, and the background portion is a latent image composed of a first color material. A camouflage in which a plurality of elements are regularly arranged to represent the second significant information and a camouflage element in which a plurality of camouflage elements made of the second color material are regularly arranged to camouflage the latent image elements. A plurality of information elements made of a second color material are arranged to represent the first significant information, and the reflective layer has a light and dark flip-flop property and / or a color flip-flop property. The information part, the camouflage element group, the reflective layer, and the latent image element group are laminated on the base material in order, and the latent image element, the camouflage element, and the information element. Are not overlapping each other The first color material and the second color material have the characteristics of a pair ink, and the reflection layer is transparent or translucent under the diffuse reflection light of visible light. The first significant information is visually recognized, and under certain conditions, the second significant information is visually recognized by the characteristics of the paired ink. Under the regular reflection light of the visible light, the reflective layer reflects the light and the reflective layer The first significant information disappears by shielding the light incident on each lower element, and the second significant information is visually recognized by the latent image element group laminated on the reflective layer. .

  The latent image printed matter of the present invention is characterized in that the information element, the latent image element, and the camouflage element are any one or a combination of an image line and a pixel.

  In the latent image printed matter of the present invention, when each element is a pixel, the information element is arranged so as to surround each element of the latent image element and the camouflage element.

  The latent image printed material of the present invention is characterized in that the information portion has an area ratio of 10% to 50% and the background portion has an area ratio of 10% to 90%.

  In the latent image printed matter of the present invention, the first significant information can be visually recognized under the observation conditions under the diffuse reflection light of visible light, and the second significant information can be visually recognized under the observation conditions under the regular reflection light of visible light. The second significant information can be visually recognized even when observed under specific observation conditions different from the observation conditions under the diffuse reflection light and the regular reflection light of visible light. As a result, the latent image printed matter of the present invention has an effect of changing from the first significant information to the second significant information by changing the observation condition from the observation condition under diffuse reflected light of visible light to two different conditions. It is possible to discriminate authenticity by visual recognition, and it is more difficult to imitate this effect as compared with the prior art, and therefore has a higher anti-counterfeit effect.

  The observation condition under specular reflection of visible light, which is one of the conditions for performing authenticity determination in the latent image print of the present invention, is that the specular reflection light generated from the latent image print is made incident on the latent image print. Therefore, anyone who has obtained the latent image printed material of the present invention can easily determine the authenticity without using a tool. In order to change from the observation conditions under diffuse reflection of visible light to the observation conditions under regular reflection of visible light, it is sufficient to incline the printed material slightly and make the light incident. However, since the image observed by the observer changes dramatically from the first significant information to the second significant information, the psychological impact is strong and the authenticity is excellent.

  In addition, the specific observation conditions that can authenticate the latent image printed material of the present invention can be freely designed according to the customer's wishes, and the degree of freedom in selecting means for determining authenticity is high. If the customer wants to reduce the possibility of forgery as much as possible, the specific observation condition may be a condition that uses light of a special wavelength other than visible light that emphasizes confidentiality, Conversely, if the customer wants to improve authenticity or wants to have a greater psychological impact on the observer, the specific observation conditions are the conditions for observing under transmitted light, What is necessary is just to design the latent image printed material of this invention as conditions which can be easily discriminate | determined by everyone as conditions which observe by giving temperature change. In addition, the image line design and the paired ink configuration for determining authenticity under specific observation conditions can be used as they are, and it is necessary to reexamine the image line conditions and ink characteristics. It is easy to design.

It is a figure which shows the latent image printed matter in embodiment of this invention. It is a figure which shows the printed image of the latent image printed matter in embodiment of this invention. It is a figure which shows the image line structure of the background part and information part of a print image in embodiment of this invention. It is a figure which shows the structure of the latent image element group and camouflage element group of the background part in embodiment of this invention. It is a figure which divides and shows the structure of the print image in embodiment of this invention for the color material to form. It is a figure which shows the layer structure of the latent image printed matter in embodiment of this invention. It is a figure which shows an example of the authenticity determination method of the latent image printed matter of this invention. It is a figure which shows an example of the authenticity determination method of the latent image printed matter of this invention. It is a figure which shows an example of the authenticity determination method of the latent image printed matter of this invention. It is a figure which shows an example of the authenticity determination method of the latent image printed matter of this invention. It is a figure which shows an example of the authenticity determination method of the latent image printed matter of this invention. It is a figure which shows an example of the structure which forms the latent image printed matter of this invention by a pixel. It is a figure which shows an example of the structure which forms the latent image printed matter of this invention by a pixel. It is a figure which shows the latent image printed matter in Example 1 of this invention. It is a figure which shows the structure of the print image in Example 1 of this invention. It is a figure which shows the image line structure of the background part and information part of a printing image in Example 1 of this invention. It is a figure which shows the structure of the latent-image element group and camouflage element group of the background part in Example 1 of this invention. FIG. 3 is a diagram illustrating a structure of a latent image printed material according to Example 1 of the present invention, divided into color materials to be formed. It is a figure which shows the effect and authenticity determination method of the latent image printed matter in Example 1 of this invention. It is a figure which shows the latent image printed matter in Example 2 of this invention. It is a figure which shows the printed image of the latent image printed matter in Example 2 of this invention. It is a figure which shows the structure of the background part and information part of a printing image in Example 2 of this invention. It is a figure which shows the structure of the latent-image element group and camouflage element group of the background part in Example 2 of this invention. It is a figure which divides and shows the structure of the latent image printed matter in Example 2 of this invention for the color material to form. It is a figure which shows the effect of the latent image printed matter and authenticity determination method in Example 2 of this invention.

  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 is a view showing a latent image printed matter (1) according to the present invention. The latent image printed matter (1) comprises a printed image (3) on at least a part of a substrate (2). The base material may be any material as long as it is a material capable of forming an image on the surface, such as fine paper, coated paper, film, metal, and the like. Moreover, there is no restriction | limiting also about the color of a base material (2), and even if it is transparent or opaque, there is no problem, and also there is no restriction | limiting in particular about a magnitude | size. The printed image (3) may have any color as long as it has a color other than the transparent color different from that of the substrate (2).

  First, the configuration of the print image (3) of the present invention is shown in FIG. The printed image (3) has at least three of a background portion (4) configured with flat gradation, an information portion (5) representing first significant information, and a reflective layer (6). Among these, the background portion (4) has at least two structures of a latent image element group (7) representing the second significant information and a camouflage element group (8) for camouflaging the latent image element group (7). In the present embodiment, the first significant information indicates the letter “A” of the alphabet, and the second significant information indicates the letter “B” of the alphabet.

  First, the configuration of the background part (4) and the information part (5) will be described. As shown in the enlarged view of FIG. 3A, the background element (4) has a pitch (in the direction S1 in the drawing) in which the background element (9) that is the image line of the image line width (W1) is pitch ( In P1), a plurality of pixels are regularly arranged to represent a flat gradation. At this time, the background element (9) is formed with a constant line width (W1) so that the background portion (4) has a flat gradation.

  In the present invention, “regularly arranged” in the case where the background element (9) is formed by an image line refers to the pitch (P1) in a first direction in which the background elements (9) are different from the image line direction. It is the state arranged by. FIG. 3A shows a state in which the first direction (S1) is the vertical direction and the pitch (P1) is arranged with respect to the background element (9) formed by the horizontal image line in the drawing. However, the direction in which the background element (9) is arranged is not limited to the direction shown in FIG. For example, the background element (9) formed by a vertical image line may be arranged at a pitch (P1) in the horizontal direction (not shown), or may be formed by a diagonally inclined image line. The background element (9) may be arranged at a pitch (P1) in the diagonally right direction.

  In the present embodiment, as shown in the enlarged view of FIG. 3B, the information element (5) has the information element (10) that is the image line of the image line width (W2) in the first direction (FIG. In the middle S1 direction), a plurality of pieces are regularly arranged at a pitch (P1) and represent the letter “A” of the alphabet as the first significant information.

  In the present invention, “regularly arranged” in the case where the information elements (10) are formed by lines is the pitch (P1) in which the plurality of information elements (10) are in a first direction different from the direction of the lines. It is the state arranged by. In the information element (10), the direction in which the information element (10) is arranged is not limited to the direction shown in FIG. 3B, but the direction in which the information element (10) is arranged is the background element ( 9) is the same direction as the direction of arrangement.

  By arranging the background element (9) and the information element (10) in the printed image (3) without overlapping each other, the printed image (3) is shaded by the difference in the area ratio. When the latent image printed matter (1) is observed under the observation conditions under the diffuse reflected light of visible light, a different gradation from the background portion (4) is produced in the flat gradation created by the background portion (4). The possessed information part (5) can be visually recognized representing the first significant information. In addition, the area ratio in this invention is a ratio of the area of each element printed in the fixed area of a base material (2). Since the plurality of information elements (10) shown in FIG. 3B all have the same line width (W2), the first significant information having a constant density is obtained even under the observation conditions under the diffuse reflected light of visible light. Although it can be visually recognized, it is also possible to represent the first significant information with gradation by partially changing the line width (W2).

  In the present embodiment, as shown in FIG. 3B, a configuration in which the information elements (10) are regularly arranged will be described. However, the information elements (10) and the background elements (9) do not overlap with each other. If so, the printed image (3) can generate significant shade due to the difference in area ratio, and can represent significant information. Therefore, the information elements (10) do not have to be regularly arranged. The information element (10) may be appropriately arranged so as not to overlap with the background element (9) according to the density of the desired first significant information.

  Although the background element (9) and the information element (10) shown in FIG. 3 are examples composed of image lines, in the present invention, the background element (9) and the information element (10) are pixels or images. You may comprise by the combination of a line and a pixel. The “image line” in the present specification is an image element in which halftone dots are continuously arranged in a certain direction for a certain distance, and is a broken line, broken line, straight line, or curved line. Any wavy line is included in the scope of the technical idea of the present invention. Further, the “pixel” in the present specification is a printing halftone dot which is the minimum unit constituting the print image (3) or a group of image elements formed by collecting a plurality of printing halftone dots. Various graphics such as circles, triangles, quadrilaterals, etc., stars, etc., characters, symbols, etc. are included, and any pixel shape is included in the pixel in the present invention. In the present embodiment, first, an example in which the background element (9) and the information element (10) are composed of image lines will be described.

  The background portion (4) includes a latent image element group (7) shown in FIG. 4 (a) and a camouflage element group (8) shown in FIG. 4 (b). As described above, the background element (4) constitutes the background element (4). In the present invention, the background element (9) is a latent element shown in FIG. It is divided into an image element group (7) and a camouflage element group (8). The color material forming the latent image element group (7) and the camouflage element group (8) will be described later. In the following description, the elements constituting the latent image element group (7) are referred to as “latent image element (11). ) ”, The elements constituting the camouflage element group (8) will be described as“ camouflage elements (12) ”.

  In the latent image element group (7), a plurality of latent image elements (11) having a line width (W1) are regularly arranged at a pitch (P1) in the first direction (the S1 direction in the figure), and the second significant The camouflage element group (8) is composed of a camouflage element group (8) having a stroke width (W1) and a pitch (in the direction S1 in the figure). A plurality of P1) are regularly arranged to represent the second significant information.

  The camouflage element group (8) is paired with the latent image element group (7), and serves to hide the latent image element group (7) in the flat gradation of the background portion (4). In the image line configuration of the present embodiment, when the latent image element group (7) is formed with the second significant information positive, the camouflage element group (8) forms the second significant information with the negative. On the contrary, when the latent image element group (7) is formed with the second significant information as a negative, the camouflage element group (8) needs to be formed with the second significant information as a positive, The latent image element group (7) and the camouflage element group (8) are always in a negative / positive inversion relationship. The latent image element group (7) and the camouflage element group (8) are formed in colors that can be visually recognized as the same color.

  As shown in FIG. 4 (a), the positive in the present invention means that the significant information itself is dark and the surrounding of one of the significant information is light. The negative in the present invention is the same as that in FIG. 4 (b). As shown in FIG. 4, the significant information itself is pale, and the surrounding of one significant information is dark. As described above, since the background portion (4) needs to express a flat gradation, the latent image element (11) and the camouflage element (12) are preferably arranged on the same line. Even if the image element (11) and the camouflage element (12) are misaligned, as long as the background (4) can be visually recognized as a flat gradation, the background (4) in the present invention is technically There is no problem included in the scope of thought. The above is the basic image line configuration in the print image (3) of the latent image print (1) of the present invention.

  Next, the reflective layer (6) will be described. The reflective layer (6) must be transparent or translucent and transmissive, and have a characteristic of strongly reflecting when light is incident. Here, translucent refers to the transparency that allows the background to be seen through even when solid printing is performed. Further, since it is not desirable that the unevenness of the reflected light is generated, it is desirable that the area ratio of the reflective layer (6) is constant over the entire surface. A specific formation method and material for forming the reflective layer (6) will be described later.

  Next, the color material forming each element will be described. In order to form the latent image print (1), at least three kinds of color materials are required. As the three kinds of coloring materials, first, they are the same color under the observation conditions under the diffuse reflection light of visible light (hereinafter referred to as “first observation conditions”), and the specific observation conditions (hereinafter referred to as “third observation conditions”). In the “conditions”), there are a first color material and a second color material that have different visibility. Note that the first color material and the second color material have different colors from the base material (2).

In the present invention, "equal color" is a state where the viewer feels the same color when the viewer glances at the diffuse reflected light of the two observation objects without paying special attention under visible light, In the present invention, the color difference ΔE between the two observation objects is in a value of 6.0 or less. The color difference ΔE here is ΔE defined in the CIE 1976 L ^* a ^* b ^* color system. The CIE 1976 L ^* a ^* b ^* color system is a color space recommended by the CIE (International Lighting Commission) in 1976, and is defined in JIS Z 8729 in the Japanese Industrial Standards. In the CIE 1976 L ^* a ^* b ^* color system, the difference between the two colors L ^* , the difference in a ^* , and the difference in b ^* are added to the square, and the square difference is taken as the color difference ΔE. The “third viewing condition” is one condition for authenticating the latent image printed material (1) of the present invention, and details will be described later.

  The first color material and the second color material used in the present invention are used as “pair ink” in a conventional printed matter for the purpose of preventing forgery. In the present invention, the “pair ink” is an ink having a pair of inks having the same color under the observation condition under diffuse reflected light and having different colors under the third observation condition. The two images formed with the pair ink are the same color under the first viewing condition and are not distinguished, but the visibility is different under the third viewing condition for determining authenticity, and one image is visualized. Specifically, the first color material has a characteristic that it is observed darker than the second color material under the third observation condition, or the second color material is invisible under the third observation condition, Alternatively, the first color material and the second color material have different visibility under the third condition. Also in the present invention, the first color material and the second color material having the characteristics of the pair ink are used. Specific examples of the first color material and the second color material having such characteristics will be described later.

  Three types of color materials for forming the latent image printed material (1) are formed with the first color material and the second color material, the image formed with the first color material, and the second color material. There is a transparent or translucent third color material that forms a reflective layer (6) placed in the middle of the image. The third color material is visible under observation conditions under regular reflected light of visible light (hereinafter referred to as second observation conditions), and optical characteristics and specific examples required for the third color material will be described later. To do.

  FIG. 5 shows images formed with the respective color materials. The latent color element group (7) is formed with the first color material, the reflective layer (6) is formed with the third color material, and the information section (5) and the camouflage element group (8) are formed with the second color material. To form an image (13). The printing method of each image may be any method such as offset printing, letterpress printing, flexographic printing, gravure printing, intaglio printing, etc. If the functionality is exhibited, digital printing such as an ink jet printer or laser printer is possible. You may form using a printing apparatus.

  FIG. 6 shows the layer structure of the latent image printed material (1) of the present invention, and the stacking order of each image will be described. First, an image (13) in which the information portion (5) and the camouflage element group (8) are combined with the second color material is formed on the substrate (2), and then the reflective layer (6 ). Finally, the latent image printed material (1) of the present invention can be produced by forming the latent image element group (7) with the first color material on the reflective layer (6). In the production of the latent image printed material (1) of the present invention, the positional relationship between the image obtained by combining the information portion (5) and the camouflage element group (8) and the reflective layer (6) does not require particularly precise printing. Even if the printing is shifted by several millimeters, the image change effect itself of the latent image printed matter (1) is not reduced, and the authenticity discrimination function is not impaired. Similarly, the positional relationship between the reflective layer (6) and the latent image element group (7) does not require precise printing. However, the imprinting of the image (13) and the latent image element group (7), which are a combination of the information section (5) and the camouflage element group (8), needs to be fitted with high precision. If there is a slight misalignment, there will be unnecessary shading between the two images due to white spots or overlapping parts, and the image to be observed under the first observation condition may be unclear, Note that the second significant information that must be concealed may be read.

  Next, a specific example of the third observation condition that can be selected using the latent image printed matter (1) of the present invention and that can determine whether it is true or false will be described. The first observation condition for performing authenticity determination of the latent image printed material (1) of the present invention is specifically, visible light having a wavelength of 400 nm to 700 nm is incident on the printed material, and the printed material. This refers to a condition in which the printed matter is observed with the naked eye from a position where there is almost no specular reflection light generated from the light, that is, the observation angle from which the so-called diffuse reflection light is dominant. The second observation condition is more specifically, light having a wavelength of 400 nm to 700 nm, which is visible light, is incident on the printed matter, and the printed matter is observed with the naked eye from an observation angle where specular reflection light generated from the printed matter is dominant. It refers to the condition to do. The third observation condition includes all conditions that can be considered under conditions other than the first observation condition and the second observation condition.

  Several examples of the third observation condition that can be selected in the present invention are shown in FIGS. 7 to 11, and the performance required for the first color material and the second color material will be described.

  FIG. 7 shows a black ink (for example, carbon black) having infrared absorbing ability for the first color material, and a black ink (for example, chromofine black or YMC) having no infrared absorbing ability for the second color material. This is an example in which the latent image printed material (1) is formed using the composite color black. FIG. 7A is a diagram schematically showing the first observation condition described above, and light having a wavelength of 400 nm to 700 nm, which is visible light, is irradiated from the light source (14) to the printed matter (1). The state of observing diffuse reflected light from the viewpoint (15a) is shown. FIG. 7B is a diagram schematically showing the third observation condition described above. In this example, the condition for observing the latent image printed matter (1) with infrared rays is the third observation condition, and FIG. 7 (b) shows a state of observing from the viewpoint (15b) using the infrared viewer (16). ing. FIG. 7C is a diagram schematically showing the second observation condition described above, and light having a wavelength of 400 nm to 700 nm, which is visible light, is irradiated from the light source (14) to the printed matter (1). The state of observing specularly reflected light from the viewpoint (15c) is shown.

  When observed under the first observation condition as shown in FIG. 7 (a), the first significant information can be visually recognized, and when observed under the second observation condition as shown in FIG. 7 (c). And when it observes using an infrared viewer (16) as shown in FIG.7 (b), 2nd significant information can be visually recognized.

  Below, the principle which produces such an effect is demonstrated. Since the first color material and the second color material are in a color matching relationship under the first observation condition and the reflective layer (6) has transparency, when observed under the first observation condition, It is invisible because it is hidden in the flat gradation of the background part (4). Therefore, under the first observation condition, the first significant information can be visually recognized by the difference in light and shade.

  On the other hand, under the second observation condition, the reflection layer (6) reflects light strongly, so that the information portion (5) existing under the reflection layer (6) and the camouflage element group (8) are combined ( 13) is concealed and becomes invisible, or changes to a pale color close to invisibility. On the other hand, since the latent image element group (7) is superimposed on the reflective layer (6), it is not affected by the increase in brightness due to the reflective layer (6). Therefore, under the second viewing condition, the image below the reflective layer (6) is bright, and the image above does not change, resulting in strong light contrast, and the second significant information is visualized and visible. The principle that the second significant information can be visually recognized under the second observation condition is the same for the examples described later. Under the third observation condition, a region that absorbs infrared light is dark and a region that does not absorb light is observed brightly. Therefore, only the second significant information formed with the first color material having infrared absorbing ability is visualized. Based on the above principle, the image change effect is exhibited under the first viewing condition, the second viewing condition, and the third viewing condition, and the authenticity determination of the latent image printed matter (1) is made by confirming the change effect. It can be carried out. In addition, the form which discriminate | determines authenticity with this infrared rays is demonstrated concretely in Example 2.

  FIG. 8 shows a brown ink that absorbs light having a wavelength of 640 nm to 700 nm as the first color material, and a brown ink that does not absorb light having a wavelength of 640 nm to 700 nm as the second color material (for example, Patent No. 1). This is an example in which the latent image print (1) is formed using the metameric pair ink described in Japanese Patent No. 4461234. In this example, the condition for observing the latent image print (1) with visible light in a limited wavelength range from 640 nm to 700 nm is the third observation condition. Therefore, when observed under the first observation condition as shown in FIG. 8 (a), the first significant information can be visually recognized, and when observed under the second observation condition as shown in FIG. 8 (c). And when it observes using the sharp cut filter (Fuji Film SC64) (17) which cuts visible light below 640 nm as shown in Drawing 8 (b), the 2nd significant information can be visually recognized.

  FIG. 9 shows an example in which a latent image print (1) is formed using a colored ink that emits light when excited by ultraviolet rays as a first color material, and a colored ink that does not emit light when exposed to ultraviolet rays as a second color material. It is. In this example, the third observation condition is that the latent image printed matter (1) is observed by irradiating ultraviolet rays. Therefore, when observed under the first observation condition as shown in FIG. 9 (a), the first significant information can be visually recognized, and when observed under the second observation condition as shown in FIG. 9 (c). And when it observes under the light source (18) which irradiates an ultraviolet-ray as shown in FIG.9 (b), 2nd significant information can be visually recognized.

  FIG. 10 shows a latent image print (1) using a normal blue ink for the first color material and a blue thermochromic ink that changes to transparent as the temperature rises for the second color material. Is an example of forming. In this example, the condition for observing the latent image print (1) while blowing hot air is the third observation condition. Therefore, when observed under the first observation condition as shown in FIG. 10 (a), the first significant information can be visually recognized, and when observed under the second observation condition as shown in FIG. 10 (c). As shown in FIG. 10B, when the hot air having a temperature corresponding to the temperature change of the thermochromic ink is blown by the dryer (19), the second significant information can be visually recognized.

  FIG. 11 shows that a blue ordinary process cyan ink having a low light transmission is used for the first color material, and a blue colored penetrating ink having a relatively high light transmission is used for the second color material. This is an example in which a latent image print (1) is formed. In this example, the condition for observing the latent image print (1) with transmitted light is the third observation condition. Therefore, when observed under the first observation condition as shown in FIG. 11 (a), the first significant information can be visually recognized, and when observed under the second observation condition as shown in FIG. 11 (c). And when it observes through light as shown in FIG.11 (b), 2nd significant information can be visually recognized. In this example, the third observation condition is an observation condition that does not require any tools, and everyone can easily determine authenticity under the two conditions of the second observation condition and the third observation condition. . This embodiment will be specifically described in Example 1.

  The above example is merely an example, but the latent image print (1) of the present invention can be freely changed by changing the characteristics of the first color material and the second color material forming the print image (3). Observation conditions can be selected, and various authenticity determination methods can be selected and added according to the functions of the first color material and the second color material. As another example of the first color material and the second color material described above, a pair of color materials is composed of various functional materials such as a photochromic material, a stress light emitting material, a liquid crystal material, and a water repellent material. It is possible to perform authenticity determination under all conditions such as irradiation with strong light, application of shear force, use of a polarizing filter, and application of water.

  Since the second observation condition is observation under specular reflection light, a metallic pigment or a pearl pigment, which has an effect of being visually recognized by strongly reflecting light under specular reflection light, is added to the second color material. The first color material is a color material of the same color as the second color material without blending these, and is characterized by being the same color under diffuse reflected light and changing to a different color under regular reflected light Do not use a pair of colorants. The reason is that the second observation condition is the same observation condition under specular reflection as the third observation condition, and the change effect is confirmed under two or more different observation conditions intended by the latent image printed material (1). This is because authenticity determination cannot be performed.

  A method of forming the reflective layer (6) and a specific material of the third color material will be described. The reflection layer (6) needs to be formed of a material having a characteristic of strongly reflecting light as described above. The reflection layer may reflect light by increasing the brightness when the light is reflected, so-called light / dark flip-flop, or changing the hue when the light is reflected, the so-called color flip-flop. It may be sex. If any of the characteristics is not provided, the second significant information appearing under the second observation condition is difficult to visually recognize or cannot be visually recognized.

  In order to impart light / dark flip-flop properties, an ink containing a resin with high glossiness can be used as the third color material. Moreover, in order to provide color flip-flop property, the ink which does not have an object color as a 3rd color material, and was mix | blended with the functional pigment which has color flip-flop property can be used. The third coloring material applying method can be formed by a method such as film sticking in addition to a method of coating with ink or coating liquid such as printing, spraying or coating.

  In recent years, a wide variety of pigments have been sold as materials having such color flip-flop properties, but as typical pigments currently on the market, iris pearl pigments, scaly mica pigments, scaly There are metal-like pigments, glass flake pigments, cholesteric liquid crystal pigments and the like. In addition, when a film is applied, bright flip-flop properties can be imparted when a simple transparent film is adhered, and color flip-flop properties can be imparted when a transparent hologram sheet, a thin film interference film, or the like is adhered.

  In addition, when the third color material has color flip-flop properties, a vivid color can be imparted to the second significant information visualized under the second observation condition, and rich color expression can be achieved. Since it is more difficult to counterfeit than the latent image printed matter (1) having only a normal light / dark flip-flop property, it can be said that this is the most desirable form in constructing the latent image printed matter (1) of the present invention.

  Needless to say, the reflective layer (6) is transparent, but even if the reflective layer (6) is translucent, if the first color material and the second color material themselves are of the same color, the semi-transparent layer is semi-transparent. The structure in which the first color material is formed on the transparent reflective layer (6) and the structure in which the second color material is formed below the reflective layer are the upper and lower layers of the color material and the reflective layer. Despite being reversed, the color matching is maintained. This is an indispensable phenomenon for forming the newly found invention. As a result of finding this phenomenon, the third color material forming the reflective layer (6) is transparent on catalogs such as iris pearl pigments, scaly mica pigments, scaly metal pigments, glass flake pigments, and cholesteric liquid crystal pigments. However, it is possible to mix functional materials that are not actually completely transparent, and it is possible to easily impart color flip-flop properties to the latent image print (1). .

  If the reflective layer (6) is opaque and completely hides the underlying color, the first color material superimposed on the reflective layer (6) and the reflective layer The color matching relationship of the formed second color material does not hold as a matter of course, and the effect of the latent image print (1) is lost. Therefore, it is necessary to avoid forming the opaque reflection layer (6). Don't be.

  The reflective layer (6) should not greatly impede the functionality of the first color material and the second color material exhibited under the third observation condition. In addition, it should not change to the same density and color as the density and color at which the first color material is visualized under the third observation condition. If the third observation condition is observation with transmitted light as shown in FIG. 11B, the reflective layer (6) must have at least the property of transmitting light. As shown in FIG. 7B, if the third observation condition is observation with infrared rays, it is desirable that the reflective layer does not have infrared absorption ability. It should not have the same absorption ability as that of the coloring material in the infrared region. When having the same absorption ability, the latent image element group (7) and the reflective layer (6) representing the second significant information when viewed under the third observation condition are visually recognized as the same density, This is because the second significant information becomes invisible.

  Furthermore, the restrictions regarding the area ratio of the information part (5) and the background part (4) will be described. In order to dramatically change the first significant information to the second significant information under the second observation condition, it is necessary to change the first significant information to a state that is visually invisible or nearly invisible. is there. However, when the difference between the shades of the information part (5) and the background part (4) is too large, it becomes difficult to change the state to visually invisible or nearly invisible under the second observation condition. Therefore, it is necessary to provide a restriction on the shading (area ratio) of the information section (5). Specifically, it is desirable that the dot area ratio is 10% or more and 50% or less. When the information part (5) is formed with an area ratio of less than 10%, the visibility of the first significant information observed under the first observation condition may be too low, and the area ratio exceeds 50%. This is because the information part (5) may not be invisible under the second observation condition.

  Further, the area ratio of the background portion (4) needs to be 10% or more and 90% or less. This is because, when the background portion (4) is configured with an area ratio of less than 10%, the latent image element group (7) is also configured with an area ratio of less than 10%. Even if it is used, it is difficult to make the second significant information having sufficiently high visibility appear in the third observation condition. On the other hand, when it is formed with an area ratio exceeding 90%, the information section (5) Since the area ratio that can be assigned to is less than 10% and the visibility of the first significant information is lowered, it is not desirable.

  Moreover, the reflective layer (6) needs to conceal the information part (5) and the camouflage element group (8) existing under the reflective layer (6) by strongly reflecting light under the second observation condition. In order to obtain strong reflected light, it is preferably formed by solid printing, but if it is in a range where the information part (5) under the reflective layer (6) can be concealed, it is formed with a constant area ratio of shadow density. May be.

  In the above description, the configuration in which the background element (9) and the information element (10) are formed by image lines has been described. Subsequently, the configuration in which pixels are formed will be described.

  FIG. 12 is a diagram illustrating a print image (3 ′) in the case where the background element (9) and the information element (10) are formed of pixels. As shown in the enlarged view of FIG. 12 (a), the background portion (4 ′) has a background element (9 ′) that is a circular pixel having a height (H1) and a width (R1), and the pitch is (P1). A plurality of them are arranged to represent a flat gradation.

  In the present invention, “regularly arranged” when the background element (9 ′) is formed of pixels means that a plurality of background elements (9 ′) are arranged in a matrix in two different directions at a pitch (P1). It is the state that was done. FIG. 12A shows a state in which the background elements (9 ′) are arranged at specific pitches in two directions of up, down, left and right directions, but the two different directions are not limited to the up, down, left and right directions, It may be in an oblique direction.

  In addition, as shown in the enlarged view of FIG. 12B, the information element (5 ′) has an information element (10 ′) that is a circular pixel having a height (H2) and a width (R2), and the pitch (P2 ) Are regularly arranged to represent the letter “A” of the alphabet as the first significant information. The configuration in which the information element (10 ') is regularly arranged is the same as that in the case where the background element (9') is composed of pixels, and thus the description thereof is omitted.

  The size of the information element (10 ′) shown in FIG. 12 (b) is the same as the case where the information element is composed of image lines. Alternatively, it may be formed of partially different pixels. When the pixels are partially formed with different sizes, the first significant information with gradation can be expressed.

  As described above, the information element (10 ') and the background element (9') are arranged so as not to overlap each other. The latent image printed matter (1) in which the information element (10 ') and the background element (9') are composed of pixels will be described in a second embodiment.

  The latent image printed material (1) of the present invention described above has a configuration in which the information element (10) and the background element (9) are configured by either a line or a pixel or a combination of a line and a pixel and do not overlap each other. As described above, in the latent image print (1) of the present invention, the print image (3) includes the information part (5) representing the first significant information, the background part (4) having a certain gradation, and the reflective layer (6). And the latent image element group (7) is camouflaged and invisible and hidden in the background portion (4), and is a modification of the embodiment described above. The image line configuration will be described below.

  For example, as in the technique described in Japanese Patent No. 4461234, the image line configuration in which the camouflage element (12 ″) and the latent image element (11 ″) of the present invention are surrounded by the information element (10 ″). There is. A specific example of this configuration will be described with reference to FIG.

  FIG. 13A shows a latent image element group (7 ″) formed by a plurality of latent image elements (11 ″), and FIG. 13B shows a plurality of camouflage elements (12 ″). ) Shows the first significant information formed by the camouflage element group (8 ″) and the plurality of information elements (10 ″).

  At this time, the latent image element group (7 ″) and the camouflage element group (8 ″) have the negative-positive relationship described above, and when the printed image (3 ″) is formed, the second significant The letter “B” of information, which is information, is hidden. In contrast to the latent image element (11 ″) and the camouflage element (12 ″), the information element (10 ″) is replaced with a camouflage element (12 ″) as shown in FIG. It is a ring-shaped pixel (illustrated by a vertical line) that is adjacently surrounded. In FIG. 13B, for the information element (10 ″) that does not surround the camouflage element (12 ″), the latent image element (11 ′) formed on the reflective layer (6 ″). As a result, the latent image element (11 ″) and the camouflage element (12 ″) cannot be distinguished from each other in the printed image (3 ″). Under the first observation condition, the area is obtained by arranging the information element (10 ″) in the flat gradation created by the latent image element (11 ″) and the camouflage element (12 ″). A difference in rate occurs and the first significant information can be observed. Even in such a configuration, the same effect as the latent image printed material (1) described in the embodiment of the present invention can be obtained.

  In addition, the configuration of the print image (3 ″) illustrated in FIG. 13 may be configured such that the information elements (10 ″) are adjacent to each other and the first significant information represents a continuous gradation image. In the case of the configuration shown in FIGS. 3 and 12, since the base material (2) is not completely covered with the color material, a part of the base material (2) can be visually recognized. The first significant information with good visibility can be visually recognized under one observation condition. This configuration will be described in the second embodiment.

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

(Example 1)
Example 1 will be described with reference to FIGS. 14 to 19. Example 1 is an example in which a latent image printed material was produced in which the third observation condition was observation with transmitted light.

  FIG. 14 shows the latent image print (1-1). The latent image printed matter (1-1) is formed by forming a light blue printed image (3-1) on a general white fine paper (form paper, manufactured by Nippon Paper Industries Co., Ltd.).

  FIG. 15 shows an outline of the structure of the print image (3-1) of the first embodiment. The printed image (3-1) includes a background portion (4-1) composed of flat gradations, an information portion (5-1) representing the first significant information, and a reflective layer (6-1). It has at least three structures. Among them, the background part (4-1) includes a latent image element group (7-1) representing the second significant information and a camouflage element group (8-1) obtained by camouflaging the latent image element group (7-1). Having at least two structures. In the first embodiment, the first significant information indicates the letter “A” of the alphabet, and the second significant information indicates the letter “B” of the alphabet.

  The configuration of the background part (4-1) and the information part (5-1) will be described with reference to FIG. The background part (4-1) is a flat floor in which a plurality of background elements (9-1) having a line width of 0.2 mm are regularly arranged at a pitch of 0.4 mm in the first direction (direction S1 in the figure). The information section (5-1) regularly arranges a plurality of information elements (10-1) having an image line width of 0.1 mm at a pitch of 0.4 mm in the first direction (direction S1 in the figure). It represents the first significant information. Since the background element (9-1) and the information element (10-1) are arranged in the print image (3-1) without overlapping each other, the background portion (4-1) The information part (5-1) having a different shade from the background part (4-1) can be visually recognized in the flat gradation created by).

  FIG. 17 shows a detailed configuration of the background portion (4-1). The background portion (4-1) is a second portion in which a plurality of latent image elements (11-1) having an image line width of 0.2 mm are continuously arranged in a first direction (direction S1 in the drawing) at a pitch of 0.4 mm. A latent image element group (7-1) representing significant information and a camouflage element (12-1) having an image line width of 0.2 mm are continuously arranged in a first direction (S1 direction in the figure) at a pitch of 0.4 mm. And a camouflage element group (8-1) representing the second significant information in pairs with the latent image element group (7-1).

  FIG. 18 shows images formed with the respective color materials. The latent color element group (7-1) is formed with the first color material, the reflective layer (6-1) is formed with the third color material, and the information section (5-1) is formed with the second color material. An image (13-1) in which the camouflage element group (8-1) is combined is formed. In Example 1, a normal light blue ink was used as the first color material, an ink having a composition shown in Table 1 was used as the second color material, and an ink shown in Table 2 was used as the third color material. . The first color material was prepared by diluting a normal UV offset printing indigo ink (manufactured by T & K TOKA) about 20 times with a UV ink varnish. The first color material and the second color material are both light blue, and when printed on the substrate with the same area ratio, a small amount of other colors appear to be the same color in observation under diffuse reflected light. The material was added and toned.

  Next, the second color material will be described. The second color material shown in Table 1 is a functional ink called colored penetrating ink. The colored penetrating ink will be described below. The colored penetrating ink is an ink in which a color pigment is mixed with a watermark ink as a coloring material, and an image formed with the colored penetrating ink has a special effect that the image disappears when watermarked. Originally, an image formed with a normal watermark ink is almost transparent under diffuse reflected light, and has an effect that the image looks bright when seen through. This is because the watermark ink is composed of resin, wax, animal and vegetable oils, etc., close to the refractive index of cellulose (1.49), and these components fill the voids between the cellulose fibers present in the paper, mainly inside the paper This is because the light transmittance is increased by suppressing light scattering.

  When a color pigment is mixed with the watermark ink, the transparent ink is colored with the color pigment, so that the watermark ink has an object color. Naturally, by increasing the mixing ratio of the colored pigment, the effect of the watermark ink, which the watermark ink had, due to the phenomenon that the pigment absorbs light, is gradually impaired. When the blending ratio was set to an appropriate amount, the decrease in light scattering inside the paper by the watermark ink and the light absorption by the color pigment were balanced, and the object color was observed under the observation conditions under diffuse reflected light. The ink becomes an ink that realizes the effect of disappearing when the image is watermarked. In Example 1, the colored penetrating ink used for the second color material has the effects as described above.

  Next, the third color material will be described. The third color material is a UV screen ink containing an iris pearl pigment. The image formed with this ink has a translucent color that is slightly whitish under the observation conditions under diffuse reflection light, and emits a golden interference color derived from the pearl pigment under the observation conditions under regular reflection light. A reflective layer (6-1) having a so-called color flip-flop property can be formed. Further, when observed with transmitted light, it exhibits a purple color that is a complementary color of gold (yellow).

  Using the above first color material, second color material, and third color material, a print image (3-1) was formed in the order described below. First, an image (13-1) in which the information portion (5-1) and the camouflage element group (8-1) are combined with the first color material is formed by the wet offset printing method, and then the third color material is formed. The reflective layer (6-1) is formed by screen printing, and the latent image element group (7-1) is finally printed on the reflective layer (6-1) by wet offset printing. Example 1 A latent image printed matter (1-1) was formed.

  FIG. 19 shows the effect of the latent image print (1-1). When observed under the first observation condition as shown in FIG. 19 (a), the first significant information representing the letter “A” of the alphabet can be visually recognized in a pale blue color. When observed under the second observation condition, the first significant information disappeared and the second significant information was visually recognized. In this case, the reflective layer (6-1) was gold, and the letter “B” of the alphabet became a light blue color, and it was confirmed that the visibility of the second significant information was further enhanced by the difference in color. Further, as shown in FIG. 19B, when the observation was performed through the light, the first significant information disappeared and the second significant information was visually recognized. In this case, the reflective layer (6-1) changes to purple, which is a complementary color of gold (yellow), and the letter “B” of the alphabet changes to dark blue, similar to the second observation condition, It was confirmed that the visibility was further enhanced by the difference. As described above, the first significant information can be viewed under the first viewing condition, the second significant information can be viewed under the second and third viewing conditions, and the image can be simply changed by changing the viewing conditions. In addition, since the color also changes greatly, it was confirmed that it has a change effect that is extremely visible and excellent in discrimination.

(Example 2)
Example 2 will be described with reference to FIGS. Example 2 is an example of producing a latent image printed material in which the third observation condition is observation with infrared rays, and is an example in which the first significant information is a human face having rich gradation.

  FIG. 20 shows the latent image print (1-2). The latent image printed material (1-2) is formed by forming a black printed image (3-2) on a white general fine paper (form paper, manufactured by Nippon Paper Industries Co., Ltd.).

  FIG. 21 shows an outline of the structure of the print image (3-2) of the second embodiment. The printed image (3-2) includes a background part (4-2) configured with flat gradation, an information part (5-2) representing the first significant information, and a reflective layer (6-2). It has three structures. Among these, the background part (4-2) includes the latent image element group (7-2) representing the second significant information and the camouflage element group (8-2) for camouflaging the latent image element group (7-2). It has two structures. Note that the first significant information in Example 2 is a person's face having a rich gradation, and the second significant information is a letter “OK” in the alphabet. Further, the image line configuration in Example 2 is different from that in Example 1, and the elements constituting the background portion (4-2) are formed of pixels.

  The configuration of the background portion (4-2) and the information portion (5-2) will be described with reference to FIG. As shown in FIG. 22 (b), the background portion (4-2) moves the circular background element (9-2) having a diameter of 0.1 mm from the first direction (direction S1 in the drawing) and the second direction ( In FIG. 22 (c), the information portion (5-2) is arranged in a regular manner at a pitch of 0.2 mm to represent a flat gradation, and the information section (5-2) includes an information element (10-2) as shown in FIG. ) With the size of halftone dots, and as the first significant information, it is formed with the face of a person with rich gradation. In the second embodiment, the information element (10-2) and the background element (9-2) are arranged without overlapping each other as shown in the enlarged view of FIG. ) Surrounds the background element (9-2). For this reason, when the elements are stacked, the information element (10-2) surrounds the background element (9-2). Therefore, as shown in FIG. Is configured to include a plurality of regions (20) that are not partially halftone. In the information section (5-2), the size and arrangement of the area (20) to which the halftone dots are not applied are the same as the background element (9-2) and the background element (9-2) as shown in FIGS. 22 (b) and 22 (c). The same size and the same spacing as the background element (9-2).

  FIG. 23 shows a detailed configuration of the background portion (4-2). The background portion (4-2) has a circular latent image element (11-2) having a diameter of 0.1 mm in the first direction (S1 direction in the drawing) and the second direction (S2 direction in the drawing) with a pitch of 0. 0. A latent image element group (7-2) regularly arranged at 2 mm to express second significant information and a circular camouflage element (12-2) having a diameter of 0.1 mm are arranged in a first direction (in the drawing). S1 direction) and the second direction (S2 direction in the figure) are regularly arranged at a pitch of 0.2 mm and paired with the latent image element group (7-2) to represent the second significant information. And a camouflage element group (8-2).

  FIG. 24 shows images formed with the respective color materials. The latent image element group (7-2) is formed with the first color material, the reflective layer (6-2) is formed with the third color material, and the information portion (5-2) is formed with the second color material. An image (13-2) in which the camouflage element group (8-2) is combined is formed. In Example 2, the first color material is an ink having an infrared absorption ability mainly composed of carbon black, and the second color material is an ink not having an infrared absorption ability mainly composed of chromofine black. The ink shown in Table 3 was used as the third color material. The first color material and the second color material are both black, and when printed on the substrate with the same area ratio, a small amount of other colors appear to be the same color under the observation conditions under diffuse reflected light. The material was added and toned.

  The object color of the first color material is black and has a characteristic of absorbing light in the infrared region, and the object color of the second color material is black and has a characteristic of not absorbing light in the infrared region. . The third colorant is a UV screen ink containing an iris pearl pigment, and the image formed with this ink has a semi-transparent color that is somewhat whitish under the observation conditions under diffuse reflected light. Under observation conditions under reflected light, an image that emits a red interference color derived from the pearl pigment is formed, and a reflective layer having a so-called color flip-flop property can be formed.

  Using the first color material, the second color material, and the third color material, a print image (3-2) was formed in the order described below. First, an image (13-2) in which the information portion (5-2) and the camouflage element group (8-2) are combined by the second color material is formed by the wet offset printing method, and then the third color material is formed. The reflective layer (6-2) is formed by screen printing, and the latent image element group (7-2) is finally wet offset printed on the reflective layer (6-2) using the first color material. Printing was performed by the method to form a latent image print (1-2) in Example 2.

  FIG. 25 shows the effect of the latent image printed material (1-2). When observed under the first observation condition as shown in FIG. 25 (a), the first significant information representing the human face can be visually recognized in a black color, and the first significant information as shown in FIG. 25 (c). When observed under the second observation condition, the first significant information disappeared and the second significant information was visually recognized. In this case, the reflective layer (6-2) was red, and the letter “OK” in the alphabet became a black color. It was confirmed that the visibility was further enhanced by the difference in color. Moreover, as shown in FIG.25 (b), when observed using the infrared viewer (16-2), the 1st significant information lost | disappeared and the 2nd significant information was visually recognizable. As described above, the first significant information can be visually recognized in the first viewing condition, the second significant information can be visually recognized in the second and third viewing conditions, and the effect of changing the image clearly by changing the viewing conditions can be obtained. I was able to confirm.

1, 1-1, 1-2 Latent image printed matter 2, 2-1, 2-2 Base material 3, 3 ′, 3 ″, 3-1, 3-2 Print image 4, 4 ′, 4-1, 4-2 Background portion 5, 5 ′, 5-1, 5-2 Information portion 6, 6 ″, 6-1, 6-2 Reflective layer 7, 7 ″, 7-1, 7-2 Latent image element Group 8, 8 ″, 8-1, 8-2 Camouflage element group 9, 9 ′, 9-1, 9-2 Background element 10, 10 ′, 10 ″, 10-1, 10-2 Information element 11 , 11 '', 11-1, 11-2 Latent image elements 12, 12 '', 12-1, 12-2 Camouflage elements 13, 13-1, 13-2 Images 14, 14 formed with the second ink -1,14-2 Light sources 15a, 15a-1, 15a-2 Observer viewpoints 15b, 15b-1, 15b-2 observed under the first condition Observer viewpoints 15c, 15c observed under the third condition -1, 15c-2 Second article Observer's viewpoint 16,16-2 infrared viewer 17 filter 18 UV light source 19 dryer 20 areas not subjected to halftone dots observed in

Claims (4)

A printed image is formed on at least a part of the substrate, and the printed image includes an information portion, a background portion, and a reflective layer, and the background portion regularly includes a plurality of latent image elements made of a first color material. A latent image element group arranged to represent the second significant information, and a camouflage element group in which a plurality of camouflage elements made of the second color material are regularly arranged to camouflage the latent image element group. The information unit includes a plurality of information elements made of the second color material to represent first significant information, and the reflective layer has light and dark flip-flop properties and / or color flip-flop properties. An image in which the information portion and the camouflage element group of the second color material are combined is formed on the base material, and the reflective layer is formed on the base material. Are stacked, and The first latent image element group by the coloring material is laminated, the latent image elements, the camouflage elements and said information elements are arranged not to overlap each other, the second coloring material and the first color material Since the reflective layer is transparent or translucent under the observation conditions under the diffuse reflected light of visible light, the first significant information has the characteristics of a pair ink, depending on the difference in the area ratio of each element. Under certain conditions, the second significant information can be visually recognized by the characteristics of the paired ink. Under the observation conditions under the regular reflection of visible light, the reflection layer reflects light and the reflection layer The first significant information disappears by blocking light incident on each lower element, and the second significant information can be visually recognized by the latent image element group laminated on the reflective layer. Latent image printed matter.   The latent image printed matter according to claim 1, wherein the information element, the latent image element, and the camouflage element are one of an image line and a pixel, or a combination thereof.   3. The latent image printed matter according to claim 2, wherein when each of the elements is a pixel, the information element is arranged so as to surround each of the latent image element and the camouflage element.   The said information part is an area ratio of 10% or more and 50% or less, The said background part is an area ratio of 10% or more and 90% or less, The any one of Claims 1 thru | or 3 characterized by the above-mentioned. Latent image printed matter.

Images