JP2013119206A - Printed article having latent image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed article whose colorful latent image is capable of being visually recognized when the angle of observation is made different by using a precise dot constitution to a base material of light brilliant properties, and whose different latent images can be visually recognized under an IR ray light source.SOLUTION: The printed article is produced by laminating a second layer comprising an opacifying material for suppressing light brilliant properties on a first layer comprising the light brilliant material, and furthermore forming a third layer thereon, by use of the first region with a chromatic coloring material, a second region divided into at least two color decomposing region by mutually different chromatic coloring materials and dots in a third region with an IR absorbing coloring element, and being made to have a visible image with a continuous gradation, a first visually recognizable full-color latent image by making the angle of observation different and a second latent image visually recognized under an IR ray light source.

Description

  The present invention relates to a printed matter having a latent image that is applied to banknotes, passports, securities, product tags, various certificates and the like for prevention of counterfeiting and duplication.

  In recent years, counterfeit printed products such as banknotes, passports, and securities have become a serious problem due to high performance and high image quality of copiers. For this reason, functional inks that are difficult to reproduce color, gloss, light emission or the like with a copying machine have been conventionally used for precious printed matter. Functional inks include metallic glossy inks such as gold ink, silver ink or pearl ink, and infrared absorbing inks that exhibit absorption characteristics in the infrared region. When authenticating printed matter using infrared absorbing ink, an identification device such as an infrared camera is required, so it is difficult to visually identify the area printed with infrared absorbing ink without an identification device. It is. On the other hand, when authenticating printed matter using metallic gloss ink, it is only necessary to pay attention to changes in gloss and color, and anyone can easily determine visually.

  Therefore, the present applicant uses metallic glossy ink for either the background image portion or the latent image portion and uses infrared absorbing ink or infrared transmitting ink for the other, and prints the same color under a visible light source. Thus, a printed matter in which the latent image can be visually recognized by changing the observation angle is disclosed (see, for example, Patent Document 1).

  In addition, the applicant of the present invention requires an appraisal device such as an infrared camera for authenticity determination, but by using a special halftone dot configuration, it is very difficult to reproduce with the current photoengraving device, and forgery A halftone print having an excellent prevention effect is disclosed (for example, see Patent Document 2).

  Patent Document 2 filed earlier by the present applicant is a printed material that forms a gradation image by arranging a plurality of two regions, and the second region is surrounded by the first region. The second region is composed of a region 2a composed of black ink containing an infrared absorbing dye, and a region 2b composed of a black system using ink not containing an infrared absorbing pigment, and the first region and The region 2b uses three primary color inks of yellow (Y), cyan (C) and magenta (M) that are used in general commercial printing.

  The printed matter described in Patent Document 2 not only exhibits the effect of preventing duplication due to a special halftone dot configuration, but also forms a latent image in the area 2a composed of black ink containing an infrared absorbing dye. For this reason, when observing with an appraisal device such as an infrared camera, an anti-counterfeiting effect is also achieved in which an image different from the gradation image observed under a visible light source can be visually recognized.

  As described above, the printed matter described in Patent Document 2 uses black ink containing an infrared absorbing dye in the region 2a constituting the latent image in order to make the image visible under an infrared light source. Since the 2b region is also configured in black so as to be the same color as the 2a region, the printed matter itself has a relatively low brightness (high density) design.

  Therefore, the present applicant further discloses a forgery prevention printed matter using a metal material instead of black ink containing an infrared absorbing dye in a region for forming a latent image (for example, Patent Document 3). reference).

  Similar to the printed matter described in Patent Literature 2, the printed matter described in Patent Literature 3 includes a gradation image visible under a visible light source and a latent image visible under an infrared light source. By using a metal material in the area for constructing an image, it is possible to eliminate the design of relatively low brightness (high density), which was a problem in Patent Document 2.

  By using a metal material, depending on the material and color, it may cause a metallic luster. Therefore, for the purpose of suppressing the metallic luster, it is colorless and transparent on the metallic material in the area constituting the latent image. Printing with a mat layer or white ink overlaid.

  Since the printed matter described in Patent Document 2 and Patent Document 3 uses a dense halftone dot configuration, it is difficult to reproduce with a photoengraving apparatus, and an image under a visible light source and an image under an infrared light source are generated. Although it is a printed matter with a high anti-counterfeiting effect that can be clearly switched and visually recognized, it requires an appraisal device such as an infrared camera, so, for example, in various window operations such as banking and immigration examinations, by simple inspection such as visual inspection There was a problem that true / false discrimination could not be performed. Therefore, there is a demand for anti-counterfeit printed matter to which a technique capable of easily determining authenticity by visual observation without using a special identification device.

  In order to solve this problem, in the present application, in addition to the switch between the image under the visible light source and the image under the infrared light source, another image is switched when the observation angle of the printed material is changed under the visible light source. The printed matter which can be visually recognized is disclosed (for example, refer patent document 4).

  The printed matter of Patent Document 4 uses a glittering material as a base material, and a concealing layer for suppressing the glittering property is provided on the base material. Further, a visible image and an infrared light source are visible on the concealing layer. By forming a printed layer for forming a latent image that can be formed, and hollowing out the same portion of the printed layer and the concealing layer or providing a region with a low concealment ratio, the glittering property of the substrate is exhibited, and the observation angle is set. This is a technique for making another latent image appear by making it different.

JP 2007-152805 A Japanese Patent No. 3544536 JP 2008-132600 A JP 2010-247515 A

  However, the printed matter disclosed in Patent Document 1 uses a metallic gloss ink to make the latent image visible by changing the observation angle, but the configuration is based on a simple solid print. As a result, the design is limited to a uniform design (with few gradations) and the anti-counterfeiting effect is not so advanced. Further, the latent image was also a single color depending on the color of the metallic gloss ink, and the color feeling was poor.

  In addition, the printed matter disclosed in Patent Document 2 and Patent Document 3 in which the problem that the latent image in Patent Document 1 is limited to a design with few gradations is subjected to authenticity determination by simple inspection such as visual inspection. There was a problem that could not. Furthermore, the printed matter disclosed in Patent Document 4 in which these problems are solved is based on the color of the base material or the color (single color) of the printing layer for forming the latent image, and has various color latents. There has been a demand for an improvement that makes an image appear.

  The present invention is intended to solve such a conventional problem, and by using a dense halftone dot configuration, it is difficult to replicate, and even a glittering base material that is a special base material is provided. It is possible to visually recognize a clear first latent image having a color sensation only by changing the observation angle, and the visible image and the first image under special observation conditions such as under an infrared light source. It is an object of the present invention to propose a printed matter that can visually recognize a second latent image different from the latent image.

  In the present invention, a printing region is formed on at least a part of a base material, and the color of the printing region is changed by changing an observation angle from a diffused light region to a regular reflection light region with respect to a visible light source at a fixed position. Even if the observation angle is changed from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position on the first layer made of the material and the first layer, the color of the first layer is changed. A second layer having at least a concealing material for concealing, and a third layer formed of a colored material on the second layer, the second layer comprising: A first concealment region that conceals a layer and a second concealment region, wherein the second concealment region comprises a concealment portion of the 2a with concealment material and a hollow portion without concealment material, or Consists of a 2a concealing part and a 2b concealing part provided with a concealing material, the first concealing region, 2a The relationship between the concealment area ratio of the concealment unit and the second concealment unit is as follows: first concealment region ≧ second concealment unit> second concealment unit, and the third layer includes at least the first region and the second concealment unit A plurality of regions are arranged so as to be adjacent to each other, the first region has a first halftone dot portion that forms a visible image with a colored color material, and the second region is formed with a different color material. A latent image portion that is divided into at least two color separation regions and stacked at the same position as the second concealment region, so that the second region is at the same position as the cutout portion or the second concealment portion; The latent image portion is divided into a first camouflage portion that is in the same position as the second-a concealing portion, and the latent image portion is formed so as to receive the color change of the first layer through the hollowed-out portion or the second-b concealing portion. The first latent image is formed by arranging a plurality of portions, and the second region In this case, since the latent image portion and the first camouflage portion are formed so as to have the same color in the diffused light region, the visible image is visually recognized in the diffused light region under the visible light source, and the latent image portion and the first camouflage portion are latent by changing the observation angle. The color difference ΔE between the image portion and the first camouflage portion changes by a predetermined value, and the printed matter has a latent image that is visible from the first latent image formed by the latent image portion.

  Further, the printed matter having a latent image of the present invention is characterized in that the latent image portion is formed with a light transmittance (hereinafter referred to as “transmittance”) of 20% or more and 100% or less.

  In addition, at least two color separation regions in the printed material having the latent image of the present invention are formed in different colors by cyan, magenta, yellow, black, or a special color material for each color separation region. It is characterized by.

  In the printed matter having a latent image of the present invention, the second area is divided into three color separation areas, and each color separation area is formed of colored materials of cyan, magenta, and yellow, or the second This area is divided into four color separation areas, and each color separation area is formed of colored materials of cyan, magenta, yellow, and black.

  Further, the printed matter having the latent image of the present invention is different in the size of the latent image portion by changing the size of the plurality of cutout portions or the second b concealing portion, and the first latent image The image is a gradation image.

  In the printed matter having a latent image according to the present invention, the cutout portions having different sizes or the second-b concealment portions are formed corresponding to at least two color separation regions.

  Furthermore, the printed matter having the latent image of the present invention is provided with the second camouflage formed in the first region or the second region so as to surround the third halftone dot portion and the third halftone dot portion. A third region is formed, and the third halftone dot portion is formed of a colored color material containing an infrared absorbing dye to form a second latent image, and the second camouflage portion is In the visible light source, it is formed of a color material that is the same color as the third halftone dot portion and does not contain the infrared absorbing dye, and at least the first area does not contain the infrared absorbing dye, The second latent image is further visible when observed under an infrared light source.

  When the printed matter having the latent image of the present invention is observed in a diffused light region under a visible light source, a visible image with gradation is visually recognized, and the full-color or multicolor latent image is obtained by observing the printed matter at an angle. Can be visually recognized, and authenticity determination can be performed by a simple method. Further, by further providing a region using an infrared absorbing material, it is possible to perform authenticity determination using a special appraisal device.

  Further, in the printed matter having the latent image of the present invention, a fine area for forming a full-color first latent image visible when the printed matter is tilted and observed is referred to as yellow (hereinafter referred to as “Y”). ), Cyan (hereinafter referred to as “C”), magenta (hereinafter referred to as “M”), and black (hereinafter referred to as “K”). As a result, the anti-counterfeiting resistance has been further improved.

It is a figure which shows an example of the printed matter which has a latent image in this invention. It is a figure which shows an example of the visible image and 1st latent image in this invention. It is a figure for demonstrating the layer structure of a printing area | region. It is a figure for demonstrating the 2nd layer in 1st Embodiment. It is a figure for demonstrating the 3rd layer in 1st Embodiment. It is a figure for demonstrating arrangement | positioning of a 2nd area | region and a 2nd concealment area | region. It is a figure for demonstrating the layer structure of the three layers in 1st Embodiment. It is a figure for demonstrating the structure of the 2nd layer of the 1st aspect in 1st Embodiment, and a 3rd layer. It is a figure for demonstrating the structure of the 2nd layer and 3rd layer of the 2nd aspect in 1st Embodiment. It is a figure for demonstrating the observation state when observing the printed matter of this invention. It is a figure for demonstrating the color difference (DELTA) E of the latent image part and camouflage part in the diffused light area | region and regular reflection light area | region under the visible light source concerning this invention. It is a figure for demonstrating the principle when a visible image is visually recognized. It is a figure for demonstrating the principle when a latent image is visually recognized. It is a figure for demonstrating the 2nd layer in 2nd Embodiment. It is a figure which shows the visible image, 1st latent image, and 2nd latent image in 3rd Embodiment. In 3rd Embodiment, it is a figure for demonstrating each image which three area | regions in a 3rd layer form. It is a figure for demonstrating the layer structure of the three layers in 3rd Embodiment. It is a graph which shows an example of the spectral transmittance of white ink and magenta ink. It is a graph which shows an example of the spectral reflectance of PET film, white ink, magenta ink, and black ink. It is a figure at the time of observing the printed matter using the base material which does not contain an infrared absorption pigment | dye under an infrared light source. It is a figure at the time of observing the printed matter using the base material containing an infrared rays absorption dye under an infrared light source. It is a figure for demonstrating the modification of the shape of a 1st area | region, a 2nd area | region, and a 3rd area | region. It is a figure explaining the certificate of Example 2. FIG. It is a figure which shows the visible image in Example 2, a 1st latent image, and a 2nd latent image. 6 is a diagram for explaining a layer configuration of three layers in Example 2. FIG.

  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 to be described below, and includes various other embodiments within the scope of the technical idea described in the claims.

  FIG. 1 is a diagram showing an example of a printed material (1) (hereinafter referred to as “printed material”) having a latent image in the present invention. As shown in FIG. 1A, the printed material (1) has a printed region (2) where the latent image in the present invention is formed on at least a part of the printed material.

  In the printed product (1), a visible image (3) as shown in FIG. 2 (a) is visually recognized in the diffused light region under a visible light source, and the printed product (1) is tilted. As a result, the first latent image (4) as shown in 2 (b) can be visually recognized. The principle of visual recognition of these two images will be described later.

  As shown in FIG. 1B, which is a cross-sectional view of the printed matter (1), the print region (2) is composed of three layers. As shown in FIG. 1, the print area (2) may be formed on a part of the print (1), but the entire print (1) may be formed as the print area (2). Further, the three layers constituting the printing region (2) are formed of the first layer (5), the second layer (6), and the third layer (7). These three layers will be described next.

(First embodiment)
First, the first layer (5) will be described. In the first layer (5), when the observation angle is changed from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position, the color changes, and the color difference ΔE with other regions changes by a predetermined value. It is formed using the material to do. The color difference in the present invention is defined by ΔE 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. The color difference is the distance in a color space of two colors, and the color difference in the CIE 1976 L ^* a ^* b ^* color system is the difference in L ^* , difference in a ^* and difference in b ^* , respectively. It can be obtained by adding the square and taking the square root.

  When the color difference ΔE changes, for example, by changing the observation angle with respect to a visible light source at a fixed position, a printing ink is produced using a material whose brightness and / or color changes, and a substrate such as paper (8 ) To give a printed region A. Similarly, printing ink is prepared using a material whose brightness and / or color does not change by changing the observation angle with respect to a visible light source at a fixed position, and is applied as a printing part on a substrate such as the paper described above. Thus, a printed matter B is produced. Let X be the color difference ΔE between the printed material A and the printed material B. Next, after changing the observation angle under a visible light source in which the printed material A and the printed material B are placed at fixed positions, the color difference ΔE between the printed material A and the printed material B is measured again. If the measured color difference ΔE is a value different from X described above, the color difference ΔE has changed. As described above, if the lightness and / or color changes by changing the observation angle with respect to the visible light source at a fixed position, the material becomes a material in which the color difference ΔE changes depending on the observation angle.

  The observation angle in the present invention will be described in the case where the direction perpendicular to the substrate is 0 °. The diffused light region is a region in which the light receiving angle is −10 to 10 ° when the incident light angle from the visible light source at the fixed position is 45 °, and the regular reflection light region is from the visible light source at the fixed position. When the incident light angle is 45 °, the light receiving angle is 35 to 55 °. The principle that the color difference ΔE changes by a predetermined value will be described later.

  Examples of the material whose color changes depending on the observation angle include a glittering material. Examples of the glittering material include a metal powder ink, a foil (metal foil), a material formed on the substrate (8) by metal vapor deposition, a metal or metallic glossy film, and the like. Metal powder ink is ink which shows a metal color by one printing. Metal powder ink is prepared by mixing a fine metal powder in a vehicle. Metal powder ink includes gold ink and silver ink. Gold ink is an ink prepared by mixing a fine brass powder in a vehicle, and silver ink is an ink prepared by mixing a fine aluminum powder in a vehicle.

  Further, instead of the metal powder ink, a foil (metal foil) may be formed on a paper sheet such as high-quality paper, coated paper, and art paper, and on a substrate such as a plastic film. Examples of the foil include gold foil and silver foil. The foil is applied onto the substrate by a hot stamp method or a cold foil method. The hot stamping method is a method in which a sheet-like foil is stacked on a substrate, pressed with a high-temperature metal stamp, and pressed onto the substrate. The cold foil method is a method in which an adhesive is applied to a base material, a sheet-like foil is stacked on the base material, and the foil is transferred by pressurization.

  Instead of foil (metal foil), aluminum or the like formed on the base material (8) by metal vapor deposition (made by Takeo Co., Ltd., off metal N silver 165 kg, etc.) may be used. The base material (8) itself may be a metal such as stainless steel or aluminum. Moreover, what formed transparent materials, such as colored ink and a colored film, on the base material with which the glitter material was formed may be used. In this case, the transmissive material needs to be a material that can visually recognize the gloss of the glittering material. Further, a metallic glossy film (manufactured by Toray Industries, Inc., PICASUS, etc.) may be used for the substrate (8). A metallic glossy film is a polyester film formed by laminating different types of polymers in multiple layers, and is a material that can obtain a metallic gloss without using a metal.

  However, when metal powder ink or metal foil is applied, the smoothness of the substrate is preferably 1,000 seconds or more and less than 2,000 seconds. In addition, the measurement of smoothness was performed by the test method prescribed | regulated to JISP8119 of Japanese Industrial Standard, and it measured using the Digibeck smoothness tester (Toyo Seiki Seisakusyo Co., Ltd. make DB-2 type | mold).

  For the first layer (5), a printing ink or a material whose color changes by changing the observation angle from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position on the base material (8) Although described with the example of forming by foil, the first layer (5) of the present invention is not limited to this, and may be formed of a material that changes the color of the substrate itself.

  For example, as shown to Fig.3 (a), when forming a printing area | region (2) in a part of printed matter (1), a part of base material (8) is formed of the 1st layer (5). Alternatively, as shown in FIG. 3B, the entire base material (8) may be formed of the first layer (5). When the entire surface of the printed matter (1) is used as the printing region (2), as shown in FIG. 3B, the first layer (5), the second layer (6), and the third layer (7) is formed on the entire surface of the printed material (1).

  Next, the second layer (6) will be described. The second layer (6) plays a role of a concealing layer for suppressing the gloss of the first layer (5) which is a lower layer. Further, the second layer (6) needs to have a color that does not affect the visible image formed by the upper third layer (7) described later. Therefore, the second layer (6) can use white ink, mat ink (mat-type OP varnish), etc., but is a concealing material capable of suppressing the gloss of the lower layer and the visible image of the upper layer ( Any material that does not affect 3) is not particularly limited. In the present embodiment, description will be made by forming using white ink. The white ink includes Dicure RTX white manufactured by DIC Corporation as UV ink for offset printing, and LIOJET FV03 White manufactured by Toyo Ink Manufacturing Co., Ltd. as UV ink for inkjet printing. In the present invention, ink for ink jet printing is defined as “ink”, and ink for other printing methods is defined as “ink”.

  As shown in FIG. 4, the second layer (6) has a hollow portion (9) that is not partially covered with a concealing material. The configuration of the second layer (6) shown in FIG. 4A is a configuration corresponding to a halftone dot configuration of a third layer (7) described later. This halftone dot configuration is a fine halftone dot configuration used in the present invention, and details will be described in the description of the third layer (7).

  FIG. 4A is a schematic diagram in which a part of the second layer (6) is enlarged. The second layer (6) corresponds to a third layer (7) to be described later. It is formed from two regions. As described above, these two regions have a role of concealing the gloss of the first layer (5) which is the lower layer, so that the first concealment region (10) and the second concealment region (11 ). Moreover, the 2nd concealment area | region (11) is comprised by the 2a concealment part (12) to which the concealment material is given, and the hollow part (9) to which no concealment material is given.

  Here, the concealed area ratio is the ratio of the area for forming the concealment material per unit area of the first concealment region (10) or the 2a concealment portion (12) in the second layer (6). is there. For example, in the 2a concealing part (12), the concealed area ratio of 80% means that the ratio of the area where the concealing material is formed is 80% of the area of the 2a concealing part (12). In this case, 20% of the area of the second-a concealing portion (12) is in the state where the first layer (5) as the lower layer is exposed because the concealing material is not formed.

  Therefore, the concealment area ratio of the second-a concealment part (12) is made lower than that of the first concealment area (10) by reducing the concealment area ratio of the first layer (5) as the lower layer. The exposure area ratio is increased, and the decrease in the brightness of the second-a concealing portion (12) is suppressed compared to the first concealing region (10). That is, when the printed matter (1) is changed from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position, the third layer (7) corresponding to the first concealment region (10) is changed. Light per unit area of the first camouflage part (16) of the third layer (7) corresponding to the 2a concealing part (12) rather than the regular reflection light of the first area (13) This is because the visibility of the first latent image (4) in the regular reflection light region may be improved as a result.

  However, by reducing the concealed area ratio, the intensity of the specularly reflected light of the cutout portion (9), that is, the first layer (5) and the specularly reflected light of the second concealed region (11) is approximated. In addition, the visibility of the first latent image (4) in the regular reflection light region may be reduced. Therefore, the hidden area ratio of the second hidden region (11) needs to be set as appropriate.

  Further, as described above, the second concealment region (11) has a hollow portion (9), and is an (enlarged) cross-sectional view taken along line X1-X2 in FIG. 4 (a). As shown in FIG. 3, white ink is not applied to the cut-out portion (9). Next, the cut-out portion (9) will be described with reference to FIGS. 4 (c) and 4 (d).

  As shown in FIG. 4C, the second concealment region (11) includes a cutout portion (9) and a 2a concealment portion (12). In FIG. 4C, the edge of the cut-out portion (9) is represented by a dotted line in order to show the second hidden region (11), but this line does not actually exist.

  As shown in FIG. 4D, the cut-out portion (9) is formed corresponding to a second region (14) of an upper third layer (7) described later. When there are two hollow portions (9), they are defined as a hollow portion (9a) and a hollow portion (9b). When there are three hollow portions (9), a hollow portion (9c) is further added. . The details of the second region (14) of the third layer (7) will be described in the description of the third layer (7), but the second region (14) Since the original image of the latent image (4) is divided by the color material of at least two of the color components obtained by color separation, three cutout portions (9a) are divided for each divided region of the color components. 9b and 9c). FIG. 4D shows a case where the second region (14) of the third layer is composed of color materials of three color components, and the three colors of the second region (14). In order to show that it corresponds to a region divided into components, for the sake of explanation, it is represented using a dotted line in the figure, but in reality, the second hidden region (11) has two or It is not divided into three parts.

  The size of the three cut-out portions (9a, 9b and 9c) in FIG. 4D, which is the size of the cut-out portion (9) in FIG. 4C, is a third layer (7 ) Is appropriately set according to the gradation of the first latent image (4) formed using the second region (14). This is the same concept as that in which gradation is expressed by the size of halftone dots when a gradation image is formed using ordinary halftone dots.

  When the cutout portion (9) is formed in the second concealment region (11), when the printed matter (1) is observed from above, the reflected light from the glittering base material (8) is reflected in the cutout portion (9). ), The first latent image (4) formed in the second region (14) of the uppermost third layer (7) can be viewed. Details of this observation principle will be described later.

  Next, the third layer (7) will be described. The third layer (7) forms a visible image (3) including a continuous tone image visible in a diffused light region under a visible light source with halftone dots. Therefore, the halftone dot configuration of the third layer (7) will be described with reference to FIG.

  The third layer (7) forms the visible image (3) shown in FIG. 5 (a), and the halftone dot configuration is the configuration shown as a partially enlarged view in FIG. 5 (b). This halftone dot structure is formed by the first region (13) and the second region (14), and a plurality of the first region (13) and the second region (14) are arranged in a matrix. . By arranging these two regions in a matrix, the visible image (3) and the first latent image (4) do not generate moire.

  As shown in FIG. 5B, the second region (14) is disposed so as to be surrounded by the first region (13), and the second region (14) is more than the first region (13). Are arranged at equal intervals along the outer periphery of the first region (13) with a small area. When the second region (14) is formed with an area larger than that of the first region (13), the second region (14) becomes noise and the visible image (3) is viewed under a visible light source. It will reduce the nature. The details of this halftone dot configuration are disclosed in Japanese Patent No. 3544536 filed by the present applicant.

  A first halftone dot portion (13a) is arranged in the first region (13), and the visible image (3) is connected to the first halftone dot portion (13a) in the first region (13). A plurality of first regions (13) arranged according to the area ratio with the region other than the first halftone dot portion (13a) can provide gradation.

  The second region (14) is a region for forming a first latent image (4) that is visible by tilting the printed material (1) under a visible light source. In order to make (4) visible, the transmittance of the second region (14) needs to be in the range of 20% to 100%. The second area (14) includes at least two color separation areas obtained by color separation of the original image of the first latent image (4) to be formed. When there are two color separation regions, they are defined as a 2a region (14a) and a 2b region (14b). When there are three color separation regions, a 2c region (14c) is further added. Become. Note that where to place each color-separated component (for example, YMCK) in the separated second region (14) may be set as appropriate, and is not particularly limited.

  When the second region (14) is divided into at least two color separation regions, each color separation region is divided by being formed with different colors. At this time, each color separation region may be formed by a single color of YMCK, but may also be formed by a special color material produced by mixing a plurality of color materials. Even if a plurality of color materials are mixed, this special color material is formed of one special color material when one color separation region is formed. Further, when a single color material based on YMCK process basic components is used, one color separation region may be formed of only a single color material, but two or more color materials may be printed in an overlapping manner. In any case, as described above, the color material forming the color separation area in the present invention is formed in different colors using the color material of the basic component of YMCK and the special color material. It is sufficient if it is divided by.

  There are two modes in the second region (14). First, the first mode will be described. Hereinafter, since the second area (14) is composed of three color separation areas of YMC, the 2a area (14a), the 2b area (14b), and the 2c area (14c). It will be explained by comprising.

  The second region (14) is formed in the same region on the lower second concealment region (11) described above, and the second concealment region (11) is a hollow portion where no concealing material is applied. (9) and the second-a concealing part (12) to which the concealing material is applied, so that the first layer (5) having a glittering property (the substrate (8) itself is a glittering material) Is divided into a part that directly receives the reflected light from the glittering substrate (8)) and a part where the reflected light is suppressed by the concealing material. The first latent image (4) formed by the difference in the reflected light of the divided glittering first layer (5) is formed between the cutout portion (9) and the 2a concealing portion (12). Depending on the area ratio, a plurality of second regions (14) can be used to provide gradation.

  Although the three color separation regions of YMC constituting the second region (14) have been described, this arrangement may be divided in the direction shown in FIG. As shown to b), you may divide | segment in the direction rotated 90 degree | times with respect to Fig.6 (a). Furthermore, in the 2nd area | region (14) arrange | positioned in multiple numbers, you may divide | segment in a respectively different direction, and it is not specifically limited.

  As described above, in the second concealment region (11) formed in the lower layer of the second region (14), the hollow portion (9) (in particular, 9a, 9b, and 9c) is formed in the second region ( 14) corresponds to the YMC that is divided, so when the second region (14) is arranged as shown in FIG. 6 (a), the second concealment as shown in FIG. 6 (c) is performed. If the second region (14) is arranged as shown in FIG. 6 (b), the second concealed region (11 shown in FIG. 6 (d) is arranged. ) In the cutout portion (9).

  Here, the principle that the first latent image (4) can be formed by the second region (14) will be described in more detail with reference to FIG.

  FIG. 7A shows the first layer (5) and the second layer when a set of the plurality of first regions (13) and second regions (14) shown in FIG. 5 is taken out. It is a perspective view which shows the lamination | stacking state of the layer (6) of this, and the 3rd layer (7), FIG.7 (b) is sectional drawing of Y1-Y2 of Fig.7 (a).

  As shown in FIGS. 7A and 7B, the first concealment region (10) of the second layer (6) and the first region (13) of the third layer (7) are the same. Similarly, the second hidden region (11) and the second region (14) are stacked at the same position. Furthermore, the 3a color separation regions constituting the second region (14) of the third layer (7) are the 2a region (14a), the 2b region (14b) and the 2c region ( 14c), the three hollow portions (9a, 9b and 9c) of the second concealment region (11) are at the same position. Therefore, as shown in FIG. 7 (b), the second region (14) stacked on the cut-out portion (9) (in the drawing, the second b region (14b )), Since there is no concealing material, it is substantially in a state of being laminated on the first layer (5).

  In FIG. 7, the layer configuration of the three layers has been described. However, as described above, the hollow portion (9) of the second layer (6) is not provided with a concealing material. The second region (14) of the third layer (7) is substantially formed on (5). Here, since the first layer (5) is formed of a glittering material, when the observation angle is changed from the diffused light region to the specularly reflected light region, the first layer (5) itself is colored. Change. Therefore, the portion corresponding to the second region (14) on the cut-out portion (9) not provided with the concealing material for suppressing the glossiness of the glitter is different from the first layer (5) when the observation angle is varied. ) And the region that is not affected by the glitter of the first layer (5). This state is shown in FIG.

  FIG. 8A shows the second concealed region (11) of the second layer (6) and the second region of the third layer (7) among the three layers described in FIG. It is the perspective view which decomposed | disassembled the lamination | stacking state. In this state, FIGS. 8B and 8C show a case where each region is viewed from directly above. Note that the second region (14) in FIG. 8B is a state when the printed matter (1) is observed in the diffused light region, and the second region (14) is composed of three color separation regions. ing. Actually, since the size cannot be distinguished with the naked eye, each color component divided as shown in this figure is not visually recognized.

  When the printed matter (1) is changed from the diffused light region to the specularly reflected light region, the first layer (5) has a characteristic that the color difference ΔE changes, so that the second layer (6) As described above, the portion of the second region (14) in the upper layer of the hollow portion (9) is substantially affected by the color change of the first layer (5). (12) The second region (14) in the upper layer is visually recognized with a different color. This state is shown in FIG.

  However, the second region (14) visually recognizes the gloss of the first layer (5), which is the lowermost layer, through the hollowed portion (9) of the second layer (6), which is the lower layer in the regular reflection light region. It is necessary to set the transmittance to such an extent that it can be achieved.

  As shown in FIG. 8D, in the second region (14), the region corresponding to the same portion as the lower cut-out portion (9) changes in color. In this second region (14), the portion that changes color when it is a regular reflection light region is defined as a latent image portion (15). The element for forming the first latent image (4), which is a feature of the present invention, is the latent image portion (15). In the second region (14), a region other than the latent image portion (15) is defined as a first camouflage portion (16).

  As described above, in the latent image portion (15), the second region (14) of the third layer (7) which is the uppermost layer is formed on the first layer (5). In the first layer (5), when the observation angle is changed from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position, the color changes, and the color difference ΔE with other regions changes by a predetermined value. In order to make the first latent image (4) in the present invention appear because it is made of a material, the latent image portion (15) utilizing the glossiness of the first layer (5) only in the regular reflection light region. ) Must be visible. Therefore, in the diffused light region, the first camouflage portion (16) and the latent image portion (15) in the second region (14) need to have the same color.

  In the diffused light region, the latent image portion (15) and the first camouflage portion (16) in the second region (14) become the same color in the diffused light region, so that the first latent image (4). Is not visually recognized, and the first layer (5) in the latent image portion (15) exhibits glitter by tilting the printed matter (1) to form a regular reflection light region, whereby the latent image portion (15) The color difference ΔE from the first camouflage portion (16) changes by a predetermined value, and the first latent image (4) formed by the latent image portion (15) can be visually recognized.

  Next, the second mode of the third layer (7) of the first embodiment will be described with reference to FIG. In the second region (14) described with reference to FIG. 8, the color material forming the latent image portion (15) and the color material forming the camouflage portion (16) are the same in each color separation region. In the second mode, the latent image portion (15) and the camouflage portion (16) are formed using two different color materials in each color separation region. It is. Hereinafter, the configuration will be described in detail.

  FIG. 9A shows the second concealment region (11) of the second layer (6) and the second region of the third layer (7) from among the three layers described in FIG. It is the perspective view which decomposed | disassembled the lamination | stacking state of (14). In this state, FIGS. 9B and 9C show a case where each region is viewed from directly above. Note that the second region (14) in FIG. 9B is a state when the printed matter (1) is observed in the diffused light region, and the second region (14) is composed of three color separation regions. ing. Actually, since the size cannot be distinguished with the naked eye, each color component divided as shown in this figure is not visually recognized.

  The first region (13) is the same as in the first embodiment, but the second region (14) is the same as the hollow portion (9) formed in the second layer (6) below. A latent image portion (15) is formed at a location corresponding to the position, and a first camouflage portion (16) is formed in another second region (14). Further, the hollowed portions (9a, 9b and 9c) of the second concealed region (11) formed in the lower layer of the second region (14) and the latent image portions (15a, 15b and 15c) formed in the upper layer portion. Are the same positions, and the 2a concealing part (12a, 12b and 12c) and the first camouflage part (16a, 16b and 16c) formed in the upper layer part are respectively the same position.

  Further, as described above, the latent image portion (15) has the uppermost second region (14) formed on the first layer (5), but the first layer (5) When the observation angle is changed from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position, the color changes, and the color difference ΔE with other regions is formed of a material that changes by a predetermined value. In order to make the first latent image (4) appear in the present invention, it is necessary to make the latent image portion (15) using the glossiness of the first layer (5) visible only in the regular reflection light region. It becomes.

  Therefore, in the diffused light region, the first camouflage portion (16) and the latent image portion (15) in the second region (14) need to have the same color. That is, the first camouflage portion (16a), the first camouflage portion (16b), the first camouflage portion (16c), the latent image portion (15a), the latent image portion (15b), and the latent image portion (15c). Must be the same color as each other.

  Therefore, the 2a region (14a), the 2b region (14b), and the 2c region (14c) are formed by two colors of the first camouflage portion (16) and the latent image portion (15), respectively. Will be. The latent image portion (15) is formed in the range of 20% to 100% transmittance. If it is lower than this range, the gloss of the first lowermost layer (5) cannot be visually recognized.

  The equal (same) color in the present invention indicates that the color difference ΔE is less than 6 when observed in a diffused light region under a visible light source. In general, when the color difference ΔE is around 6, there is a possibility that a different color is visually recognized. However, as described above, in the present invention, the first region (13) and the second region (14) are configured with a minute size that cannot be distinguished and visually recognized by the naked eye. . Therefore, if the color difference ΔE is less than 6, in the diffused light region under the visible light source, the latent image portion (15) and the first camouflage portion (16) in the second region (14) are not visible to the naked eye. , Are visually recognized as the same color.

  Note that due to metamerism, when viewed in a diffused light region under a visible light source, a color visually recognized by the naked eye is viewed in a different color when observed in a diffused light region under a specific light source. Even in this case, in the present invention, the latent image portion (15) and the first camouflage portion (16) in the second region (14) are formed in the same color.

  Moreover, since the printed matter (1) of the present invention is formed of at least two colors in order to make the first latent image (4) visible more clearly, the first latent image (4) is formed. The second area (14) for forming the first latent image (4) is composed of, for example, three color separation areas (14a, 14b and 14c) based on YMC color components. As for the color balance and gradation of), the positions corresponding to the three color separation regions (14a, 14b and 14c) of the third layer (7) in the cut-out portion (9) of the second layer (6). Adjustment is possible by changing the size of each cut-out portion (9a, 9b and 9c).

  The area (vertical × horizontal) of each region in the halftone dot configuration constituting the third layer (7) shown in FIG. 5 (b) is, for example, the first region (13) formed by m × m, When the second region (14) is formed by n × n, it can be appropriately set within a range of m> n> 0.

  Inks for printing the first region (13) and the second region (14) constituting the third layer (7) are cyan (C), magenta (M), yellow (Y ) And black (K) process ink, or a special color ink having a special color excluding the process ink. Types of ink include offset ink, gravure ink, screen ink, and ink for inkjet printers.

(Observation principle of each image)
The configuration of each layer and the positional relationship in the stacked state have been described. Here, the visual recognition principle of the visible image (3) and the first latent image (4) of the present invention in the configuration and positional relationship of each layer described above. Will be described.

  First, the observation position necessary for visually recognizing the visible image (3) and the first latent image (4) will be described. As described above, the latent image portion (15) and the first camouflage portion (16) in the third layer (7) are visually recognized in the same color in the diffused light region under the visible light source. The latent image portion (15) (actually, the first layer (5) visually recognized from the latent image portion (15)) cannot be viewed, and conversely, in the specular reflection light region under the visible light source Is configured so that the latent image portion (15) can be visually recognized with the naked eye. In general, the color of an object is determined by a light source, an observation environment (temperature), a spectral reflectance of the object, and the like. Although how to perceive the colors visually recognized by these observation conditions is different, the observation conditions in the present invention are constant conditions (for example, observation conditions: the light source is D65 and the observation environment is 20 ° C.). .

  FIG. 10 shows the visible light source (R) and the viewpoint (1) when the printed matter (1) according to the present invention is observed in the diffused light region and the specularly reflected light region with respect to the visible light source (R) at a fixed position. It is the figure which showed three positional relationships of E1, E2) and printed matter (1). When the visible light source (R), the viewpoint (E1), and the printed material (1) are in the positional relationship shown in FIG. 10A, the observation is made in the diffused light region. In addition, when the visible light source (R), the viewpoint (E2), and the printed material (1) are in the positional relationship shown in FIG.

  Next, the principle that the color difference ΔE between the latent image portion (15) and the first camouflage portion (16) in the third layer (7) changes by a predetermined value due to the change in the observation angle will be described. As described above, the diffused light region in the present invention is a region where the light receiving angle is −10 to 10 ° when the incident light angle from the visible light source at a fixed position is 45 °, and the specularly reflected light region is When the incident light angle from the visible light source at a fixed position is 45 °, it is a region where the light receiving angle is 35 to 55 °. In the printed matter (1), the latent image portion (15) and the first camouflage portion (16) are the same color in the positional relationship meaning the diffused light region shown in FIG. Cannot be distinguished, and only the visible image (3) is visually recognized.

  On the other hand, in the specular reflection light region shown in FIG. 10B, at least the first layer (5) of the print region (2) is formed using a material that changes color by changing the observation angle. Therefore, by changing the observation angle from the diffuse light region to the regular reflection light region with respect to the visible light source, the brightness and / or color changes, and the latent image portion (15) in the third layer (7) The color difference ΔE from the first camouflage portion (16) changes by a predetermined value. Therefore, the latent image portion (15) is visible, and the first latent image (4) formed by the plurality of arranged latent image portions (15) is visible.

  FIG. 11 (a) is a graph showing the color difference ΔE of the latent image portion (15) and the first camouflage portion (16) of the third layer (7) in the diffused light region, and FIG. It is a graph which shows color difference (DELTA) E of the latent image part (15) in a regular reflection light area | region, and an area other than that. The halftone dot configuration in FIG. 11 is the same as the configuration shown in FIG.

  As the measurement sample, first, as the measurement sample A (4 × 4 cm), the first region (13) has an area corresponding to 30 × 30 pixels at a resolution of 600 dpi (hereinafter, the same resolution), a second In the first layer (5), the area (14) is defined as an area corresponding to 6 × 6 pixels, and the three color separation areas (14a, 14b, and 14c) based on YMC color components are defined as areas corresponding to 6 × 2 pixels, respectively. ) On the base material (made by Takeo Co., Ltd., off-metal N silver, 165 kg), the area ratio of the hollow portion (9) in the second concealment region (11) as the second layer (6) is 100% (second The first concealment region (11) is a hollowed-out portion (9)) and white ink (LIOJET FV03 white manufactured by Toyo Ink Manufacturing Co., Ltd.) is used to perform the first concealment by ink jet printing. Only the area (10) has a hidden area ratio of 100% (solid printing), and the first area (13) is not printed as the third layer (7), and the latent image portion (15) of the second area (14) is printed. ) Is 100% (the area ratio of the first camouflage portion (16) is 0%), and three color separation regions (14a, 14b, and 14c) based on YMC color components are treated with process ink (Toyo Ink Manufacturing Co., Ltd.) Manufactured by LIOJET FV03 Cyan, Magenta and Yellow).

  In addition, the measurement sample B (4 × 4 cm) includes a first area (13) corresponding to an area corresponding to 30 × 30 pixels, a second area (14) corresponding to an area corresponding to 6 × 6 pixels, and a YMC color component. The three color separation regions (14a, 14b, and 14c) according to the above are defined as areas corresponding to 6 × 2 pixels, respectively, on the base material (made by Takeo Co., Ltd., off-metal N silver 165 kg) as the first layer (5). As the second layer (6), the area ratio of the hollow portion (9) in the second concealment region (11) is 0% (the second concealment region (11) has no hollow portion (9)), and the white layer Using the ink (Toyo Ink Manufacturing Co., Ltd., LIOJET FV03 White), the first concealment area (10) and the second concealment area (11) were 100% concealed area (solid printing) by inkjet printing, 3 layers (7 ) As a process ink (manufactured by Toyo Ink Mfg. Co., Ltd.). LIOJET FV03 cyan, magenta, yellow and black) was used for inkjet printing.

  A graph showing the color difference ΔE between the latent image portion (15) and the first camouflage portion (16) in the diffused light region shown in FIG. 11 (a), and the latent image in the specularly reflected light region shown in FIG. 11 (b). The color difference ΔE between the part (14) and the first camouflage part (16) is measured using a variable angle spectrophotometer GSP-2 type (manufactured by Murakami Color Research Laboratory Co., Ltd., hereinafter referred to as “measuring device”). The L * value, the a * value, and the b * value of the measurement sample A and the measurement sample B were measured, and the color difference ΔE was calculated from the obtained values. Note that, since the measurement sample A and the measurement sample B do not print the first region (13) as the third layer (7), the area ratio of the measurement sample A (first camouflage portion (16) is 0). %, That is, the color difference ΔE between the latent image portion (15) and the measurement sample B (the first camouflage portion (16) is 100%), and the latent image portion (15) and This is expressed as a color difference ΔE from the first camouflage portion (16).

  However, in order to reproduce the positional relationship meaning the diffused light region shown in FIG. 10A on the measuring apparatus, the incident light of the visible light source with respect to each measurement sample is fixed at 45 °, and the light receiving angle is −10 °. From 10 to 10 °. In addition, in order to reproduce the positional relationship meaning the specularly reflected light region shown in FIG. 10B on the measuring apparatus, the incident light of the visible light source with respect to each measurement sample is fixed at 45 °, and the light receiving angle is 35 °. It was measured by changing the angle from 55 ° to 55 °. The calibration of the measuring apparatus was performed using a standard white plate 4020A with an incident light angle of 45 ° and a light receiving angle of 0 °, that is, the standard white plate was calibrated with a completely diffusing surface.

  As shown in FIG. 11A, in the diffused light region, the color difference ΔE between the latent image portion (15) and the first camouflage portion (16) is 0.15 to 0.31 at any light receiving angle. And a relatively small value. As described above, if the color difference ΔE is less than 6, the colors are the same color. Therefore, in the diffused light region, the latent image portion (15) and the first camouflage portion (16) are always the same color. Therefore, it is difficult to distinguish the latent image portion (15) and the first camouflage portion (16) with the naked eye. As a result, the first latent image ((3) formed in the visible image (3)). 4) is not visible.

  On the other hand, in the specularly reflected light region shown in FIG. 11B, there is a light receiving angle where the color difference ΔE between the latent image portion (15) and the first camouflage portion (16) is 7.61. When the color difference ΔE between the latent image portion (15) and the first camouflage portion (16) in the diffused light region (for example, light receiving angle 0 °) is 0.20, the specularly reflected light region (for example, light receiving angle 45 °) ), The color difference ΔE between the latent image portion (15) and the first camouflage portion (16) is 7.61. That is, by changing the observation angle from the diffuse light region to the regular reflection light region, the color difference ΔE changes by 7.41 from 0.20 to 7.61. Therefore, when the color difference ΔE changes by 6 or more, the latent image portion (15) and the first camouflage portion (16) can be distinguished with the naked eye, and as a result, formed in the visible image (3). The first latent image (4) can be visually recognized.

  Note that the diffused light region and the regular reflection light region can be switched by tilting the printed material (1). That is, by tilting the printed matter (1), the latent image portion (15) and the first camouflage portion (16) can be distinguished with the naked eye. As a result, the first latent image (4) formed in the visible image (3) can be viewed.

(Visibility principle of visible image in the present invention)
Furthermore, the principle that a visible image is visually recognized will be described in detail. FIG. 12 is a plan view and a partially enlarged view when the printed region (2) formed on the printed matter (1) according to the present invention is visually recognized in the diffused light region under the visible light source (R) at a fixed position. FIG. In the print area (2), in the diffused light area under the visible light source (R), as shown in the partially enlarged view of FIG. Furthermore, since the latent image portion (15) and the first camouflage portion (16) in the third layer (7) are visually recognized as the same color, the respective regions cannot be distinguished. Therefore, the first latent image (4) formed by the latent image portion (15) cannot be viewed, and only the visible image (3) shown in FIG.

  FIG. 12C is a schematic diagram illustrating a relationship between the printed material (1), the light source (R), and the viewpoint when the visible image (3) is visually recognized. When the printed product (1) is viewed with the naked eye in the diffused light region under the visible light source (R), first, in the first region (13), the incident light (R1) from the visible light source (R) is used. , Specularly reflected light (R2) and diffused light (R3) are generated, and diffused light (R3) is obtained in the diffused light region.

  In the second region (14), incident light (R1) from the visible light source (R) generates specularly reflected light (R4) and diffused light (R5). In the diffused light region, diffused light (R5) is generated. can get. Further, since the second region (14) is composed of the latent image portion (15) and the first camouflage portion (16), it reflects and diffuses specularly reflected light (not shown), respectively. Light (not shown) is obtained. Since the latent image portion (15) and the first camouflage portion (16) are formed so as to have the same color when observed in the diffused light region under the visible light source, the difference in the diffused light in each region. Is not visible to the naked eye.

  In the halftone dot configuration constituting the third layer (7) in the present invention, the first region (13) has a larger area than the second region (14). Therefore, in the diffused light region under the visible light source, the first region (13) is observed more dominantly than the second region (14). Further, as described above, the latent image portion (15) and the first camouflage portion (16) in the second region (14) are formed so as to have the same color when observed in the diffused light region under the visible light source. Therefore, the first latent image (4) formed by the latent image portion (15) cannot be visually recognized, and only the visible image (3) can be visually recognized.

(First viewing principle of latent image in the present invention)
Next, the details of the principle by which the first latent image (4) is visually recognized will be described. FIG. 13 is a plan view and a schematic view when the printed region (2) formed on the printed matter (1) according to the present invention is visually recognized in the specularly reflected light region under the visible light source (R) at a fixed position. It is. The print area (2) is a specular reflection light area under the visible light source (R), as shown in the partially enlarged view of FIG. 13B, the latent image portion (15) (second layer (6) The position corresponding to the hollowed-out portion (9) is visible with the naked eye. That is, the first latent image (4) can be visually recognized.

  This is because the latent image portion (15) and the first camouflage portion (16) in the second region (14), which are in the same color in the diffused light region and cannot be distinguished, The color of the first layer (5) which hits the lower part of the latent image portion (15) changes, and the latent image portion (15) of the third layer (7) and the first layer via the cutout portion (9) of the upper layer thereof. The color difference ΔE from one camouflage portion (16) changes by a predetermined value, and the latent image portion (15) and the first camouflage portion (16) are distinguished with the naked eye in the same second region (14). Because it became possible.

  FIG. 13C is a schematic diagram illustrating a relationship between the printed material (1), the light source (R), and the viewpoint when the first latent image (4) is visually recognized. When the printed matter (1) is visually recognized in the specularly reflected light region under the visible light source (R), first, in the first region (13), the incident light (R1) from the visible light source (R) is used. , Regular reflection light (R2) and diffused light (R3) are generated, and regular reflection light (R2) is obtained in the regular reflection light region.

  In the latent image portion (15) that forms the first latent image (4), specularly reflected light (R4) and diffused light (R5) are generated. In the specularly reflected light region, strong specularly reflected light (R4) is generated. Is obtained. Further, the first camouflage portion (16) in the second region (14) generates specularly reflected light (R6) and diffused light (R5), and the specularly reflected light region obtains specularly reflected light (R6). It is done.

  Therefore, the specular reflection light (R4) of the latent image portion (15) becomes stronger than the specular reflection light (R2, R6) of the first region (13) and the first camouflage portion (16), and its gloss value Due to the difference, a high color difference ΔE is generated in the second region (14), and it can be visually recognized as the first latent image (4). Therefore, in the regular reflection light region under the visible light source, the first latent image (4) can be visually recognized when the print region (2) of the printed matter (1) is observed.

(Second Embodiment)
Next, another embodiment of the present invention will be described. The first layer (5) and the third layer (7) are the same as those in the first embodiment, and are omitted. A part of the second layer (6) that overlaps with the first embodiment will be omitted.

  In the second embodiment, as different from the first embodiment, the hollow portion (9) is not formed in the second layer (6), and the hidden area ratio is lower than that of the second hidden portion (12). By forming the 2b concealing portion (17) having an area ratio, the latent image portion (15) is formed due to the difference between the concealing area ratio and the transmittance.

  First, the layer structure in the second layer (6) will be described with reference to FIG. Similar to the first embodiment, the second layer (6) plays a role of concealing the gloss of the first layer (5), and thus is formed using white ink. However, white ink is also printed on the portion corresponding to the cutout portion (9) in the first embodiment as shown in FIG. 14 (c), but the first concealment region (10) and the second a The hidden area ratio is lower than the hidden area ratio of the concealing portion (12), and this region is defined as the second concealing portion (17).

  Accordingly, the relationship between the first concealment region (10) and the concealment area ratio of the second concealment part (12) and the second concealment part (17) constituting the second layer (6) is as follows. Hiding area (10) ≧ 2a hiding part (12)> 2b hiding part (17). However, since the second-b concealing portion (17) needs to be accompanied by the gloss of the first lower layer (5) in the regular reflection light region, the concealment area ratio is in the range of 0% to less than 100%. It is necessary to.

  In addition, since the first concealment region (10) and the 2a concealment part (12) need to suppress the gloss of the first layer (5), which is the lower layer in the regular reflection light region, It is necessary to make the range larger than 0% and not more than 100%. As described above, the 2b concealing portion (17) is defined by separating the hollow portion (9) in the first embodiment and the modified example by printing white ink. The concealment area ratio of the concealment part (17) may be 0%. For example, as in the first embodiment, the hidden area rate of the first hidden region (10) is 100%, the hidden area rate of the 2a hidden portion (12) is 100%, and the 2b hidden portion (17 ) May be 0%. The first concealment region (10) described above is determined by the transmissivity of the second layer (6) (for example, the light transmissivity of the second layer (6) formed of white ink and having a concealment area ratio of 100%). Since the appropriate range of the concealment area ratio of the 2a concealing part (12) and the 2b concealing part (17) is different, it is not limited to the appropriate range described above.

  As described above, the second b concealment part (17) has a lower concealment area ratio than the first concealment area (10) and the second a concealment part (12), and as described above, Since the glossiness in the layer (5) can be visually recognized, the first latent image (4) is formed by arranging a plurality of the second b concealing portions (17). The concealment area ratio of the first concealment region (10), the 2a concealment unit (12), and the 2b concealment unit (17) is set to be close to 0% or 0%, that is, Even when the layer (6) is set to be substantially omitted, if the gloss of the 2b concealing portion (17) is higher than that of the first region (13) and the second region (14) as a printed matter, the regular reflection light The first latent image (4) in the region is visible. However, when the concealment area ratios of the first concealment region (10) and the 2a concealment unit (12) and the 2b concealment unit (17) are approximated, the first latent image (4) in the regular reflection light region The visibility of the first concealment area (10), the 2a concealing part (12), and the 2b concealing part (17) must be set appropriately.

  By configuring the second layer (6) in this way, the second-b concealing portion (17) has a lower concealment area ratio than the other concealment regions, and therefore the first layer ( The intensity of the reflected light of 5) is larger than that of the other concealment regions, and the second b concealment portion (17) of the second layer (6) is provided in the second region (14) of the third layer (7). ) Is a latent image portion (15) for forming the first latent image (4) described in the first embodiment by the reflected light (gloss) of the first layer (5). .

(Third embodiment)
Next, another embodiment of the present invention will be described. The three-layer structure of the first layer (5), the second layer (6), and the third layer (7) itself is the same as the first layer described above. Since it is the same as that of embodiment and 2nd Embodiment, the overlapping part shall be abbreviate | omitted.

  In the first embodiment and the second embodiment, the visible image (3) visible in the diffuse reflection light region and the first latent image (4) visible in the regular reflection light region are formed. However, in the third embodiment, a second latent image (18) that is visible under an infrared light source is formed.

  About the printed matter (1) in 3rd Embodiment, it is the same as that of FIG. 1 on an external appearance. However, as for the formed image, as shown in FIGS. 15A and 15B, a visible image that can be visually recognized in the diffusely reflected light region described in the first embodiment and the second embodiment. As shown in (3) and the first latent image (4) visible in the specular reflection light region and FIG. 15 (c), the image can be viewed under the infrared light source newly added in the present embodiment. Three of the second latent image (18).

  In order to form the second latent image (18), the third layer (7) needs to have a configuration different from those of the first and second embodiments. The configuration of the layer (7) will be described. In addition, about the 1st layer (5) and the 2nd layer (6), it is the same as that of 1st Embodiment and 2nd Embodiment.

  FIG. 16A shows the printing region (2) in the third layer (7), and FIG. 16B shows a partially enlarged view thereof. As shown in FIG. 16B, the basic halftone dot configuration is the same as that of the first embodiment and the second embodiment described above, and the second region surrounds the first region (13). (14) is arranged without gaps. Here, as a difference from the above-described embodiment, another third region (19) is arranged in the first region (13). However, the third region (19) does not necessarily have to be arranged in the first region (13), but at least two color separations arranged in the second region (14). Similar to the region, it may be arranged in the second region (14). This arrangement example will be described later together with other shape examples of each region.

  FIG. 16C1 is a diagram illustrating an example of the visible image (3) and the first region (13). The first region (13) is a region for forming a visible image (3) that is visible under reflected light (diffused light) under a visible light source. Since the configuration for forming the visible image (3) has already been described, a description thereof will be omitted. However, the second latent image (18) in the present embodiment is visible under an infrared light source, so The point portion (13a) is formed using a colored color material (particularly, colored ink) that does not contain an infrared absorbing dye. When the first halftone dot portion (13a) is formed of a colored color material that does not contain an infrared absorbing dye, the visible image (3) is obtained when the first halftone dot portion (13a) is observed using a special identification device such as an infrared camera. It becomes impossible to see.

  In addition, it does not specifically limit in the colored color material which does not contain an infrared absorption pigment | dye, if it does not have an infrared absorption characteristic, Well-known gravure ink, screen ink, process ink, etc. can be used. For example, among general four-color inks, cyan (C), magenta (M), and yellow (Y) have the property of not absorbing infrared rays, and these three colors are superposed to form a black system. In other words, the same effect as a pigment that does not absorb infrared rays can be obtained. Further, as black ink having infrared transmission characteristics, chromofine black ink (manufactured by Dainichi Seika Kogyo Co., Ltd.) and dye-based ink for ink jet printer (for example, dye-based black ink manufactured by Canon, etc.) can be used.

  FIG. 16C2 is a diagram illustrating an example of the first latent image (4) and the second region (14). The second region (14) is a region for forming a first latent image (4) that is visible under reflected light (regularly reflected light) under a visible light source. Since this configuration is also described above, it will be omitted.

  FIG. 16 (c3) is a diagram illustrating an example of the second latent image (18) and the third region (19). The third region (19) is a region for forming the second latent image (18) visible under the infrared light source shown in FIG. 16 (c3), and the third halftone dot portion (19a). And a second camouflage portion (19b). A plurality of second latent image images (18) are arranged in accordance with the area ratio between the third halftone dot portion (19a) and the second camouflage portion (19b) in the third region (19). It is possible to give gradation by the area (19) of 3. In the third region (19), the third halftone dot portion (19a) is formed using a colored color material containing an infrared absorbing dye.

  In addition, the colored color material containing the infrared absorbing dye includes black (K) mainly composed of carbon black. However, it is not limited to this as long as it is a colored color material having infrared absorption characteristics. For example, organic dyes having absorption in the infrared region include polymethylene, phthalocyanine, azo, and anthraquinone compounds, and inorganic infrared absorbers include antimony-doped tin oxide and tin-doped indium oxide. .

  In the third region (19), the second camouflage portion (19b) is formed in the same color as the third halftone dot portion (19a) using a colored color material that does not contain an infrared absorbing dye. As described above, the uniform color in the present invention refers to a color that is visually recognized by the naked eye when observed under reflected light (diffused light) under a visible light source. Specifically, the color difference ΔE is 6. Less than color. Note that due to metamerism, when observed under reflected light (diffused light) under a visible light source, the color visually recognized by the naked eye was observed under reflected light (diffused light) under a specific light source. In this case, it is assumed that the second camouflage portion (19b) and the third halftone dot portion (19a) are formed in the same color even when viewed in different colors.

  The third halftone dot portion (19a) is formed using a colored color material containing an infrared absorbing dye, and the second camouflage portion (19b) is formed using a colored color material containing no infrared absorbing dye, By forming the third halftone dot portion (19a) in the same color, the third halftone dot portion (19a) and the second camouflage portion (19b) are visually recognized in the same color under the visible light source. Therefore, the third region (19) is in a uniform flat mesh state, and the second latent image (18) cannot be recognized with the naked eye, but is observed using a special appraisal device such as an infrared camera. In this case, the second latent image (18) can be visually recognized.

  The third dot portion (19a) and the second camouflage portion (19b) can be formed in the third region (19) by overlapping or hair removal, but in the present invention, they are formed by overlapping. It is preferable to do. When forming by tapping, high printing accuracy is required. When the printing accuracy is low, a printed portion is generated around the third halftone dot portion (19a). Accordingly, the third region (19) does not become a uniform flat mesh state under a visible light source, and the second latent image (18) may be visible with the naked eye.

  FIG. 17A shows a state in which the print region (2) is configured by three layers in the state where the configuration of the third layer (7) is used, and Y1- in FIG. FIG. 17B is a Y2 cross-sectional view. In the first embodiment, the third region (19) is added to the configuration described with reference to FIG. In the third embodiment, since the third halftone dot portion (19a) is formed of a color material containing an infrared absorbing dye, the second layer (6) does not contain an infrared absorbing dye. Is required. If the second layer (6) contains an infrared absorbing dye, the second latent image (18) formed by the third halftone dot (19a) is not visible under an infrared light source.

  Furthermore, the second layer (6) formed of the concealing material preferably has a transmittance of 80% or less in the infrared region. When the transmittance in the infrared region of the second layer (6) is 80% or more, when the printed matter obtained by the third embodiment is observed under an infrared light source, the substrate (8) is removed. The second layer (6) to be concealed is transmitted, and the first region (13), the second region (14) and the third region (19) are all transmitted and the substrate (8) is observed. The Therefore, when the base material (8) contains an infrared absorbing pigment, the concentration is observed to be high (blackish). Therefore, the third halftone dot portion (19a) cannot be distinguished from other regions, and as a result, the second latent image (18) that can be observed under the infrared light source cannot be viewed. For this reason, it is not preferable that the transmittance of the second layer (6) in the infrared region is 80% or more.

  FIG. 18 is a graph showing an example of the spectral transmittance of white ink and magenta ink according to the present invention. (A) in FIG. 18 is the spectral transmittance of the concealment material in the present invention, and colorless (transparent) PET by inkjet printing using white ink (LIOJET FV03 White manufactured by Toyo Ink Manufacturing Co., Ltd.) as a measurement sample. A film having a solid print was used. (B) in FIG. 18 is the spectral transmittance of the concealment material according to the present invention. As a measurement sample, white ink (LIOJET FV03 White, manufactured by Toyo Ink Manufacturing Co., Ltd.) is used as a measurement sample. The sample shown in (a) was printed at a lower print density.

  (C) in FIG. 18 is the spectral transmittance of the color material that does not contain the infrared absorbing dye in the present invention, and as a measurement sample, by magenta ink (LIOJET FV03 magenta manufactured by Toyo Ink Manufacturing Co., Ltd.) by inkjet printing, A PET film subjected to solid printing was used. The spectral transmittance shown in FIG. 18 indicates the spectral transmittance of each measurement sample divided by the spectral transmittance of a colorless (transparent) PET film as a base material. , And measured using a self-recording spectrophotometer (U-4000 model made by HITACHI).

  Comparing changes in spectral transmittance in the infrared region of 760 to 800 nm, the spectral transmittance of the concealing material (a) is substantially constant at about 50% in any region. The spectral transmittance of the concealing material (b) printed at a reduced printing density is about 80% in the infrared region, which is a higher value than the concealing material (a) printed solid. The infrared transmitting material (c) containing no infrared absorbing dye has a high value in the infrared region, about 95%, compared with the white ink (a) printed solid and the white ink (b) printed at a reduced printing density. It has become. In the case of a colorant that does not contain an infrared absorbing dye at the same wavelength, the lower spectral transmittance is visually recognized as having a higher density (whiter), and conversely, the higher spectral transmittance has a lower density ( Visible visually. When observed with an infrared camera, the concealing material (a) is white, the concealing material (b) printed at a reduced printing density is pale white, and the infrared transmitting material (c) is substantially transparent. Observed.

  In the second region (14), the first camouflage portion (16) is the same color as the latent image portion (15) in the diffuse reflected light region, and includes an infrared absorbing dye around the latent image portion (15). It is formed using a colored color material that is colored or not. As described above, the latent image portion (15) is formed by partially exposing the glittering material as the base material (8) through the cutout portion (9) to which no concealing material is applied. For this reason, when the base material (8) contains an infrared absorbing dye, the first camouflage portion (16) needs to be formed of a colored coloring material containing the infrared absorbing dye. When the infrared absorbing dye is not included, the first camouflage portion (16) needs to be formed of a colored color material that does not include the infrared absorbing dye. This is because the visibility of the second latent image (18) is affected when the second latent image (18) is observed with a device such as an infrared camera.

  The second latent when the colored material forming the first camouflage portion (16) includes and does not include the infrared absorbing dye, when the substrate (8) includes and does not include the infrared absorbing dye. The difference in the observation image of the image image (18) will be described later.

The area (vertical × horizontal) of each region in the halftone dot configuration of the third embodiment is formed such that the first region (13) is m × m and the second region (14) is n × n. If the third region (19) is formed by k × k, it can be set as appropriate within the range of m>n> 0 and m>k> 0. Preferably, the first region (13) is m × m (m ≧ 2, m is an integer), the third region (19) is k × k (k ≧ 1, k is an integer), the second region ( 14) is formed by n × n (n ≧ 1, n is an integer), and the area of the first region (13) is the sum of the areas of the second region (14) and the third region (19). Greater than (m ² > n ² + k ² ). When the area of the first region (13) is smaller than the sum of the areas of the second region (14) and the third region (19), observation is performed under reflected light (diffused light) under a visible light source. In this case, the second region (14) and the third region (19) become noise, which is not preferable because the visibility of the visible image (3) is lowered.

  FIG. 19 shows the substrate (8) of the first layer (5), the concealing material forming the second layer (6), the ink containing no infrared absorbing dye, and the ink containing the infrared absorbing dye according to the present invention. It is a graph which shows an example of spectral reflectance. (A) in FIG. 19 is the spectral reflectance of the substrate (8) in the present invention, and as a measurement sample, formed on a paper substrate by aluminum vapor deposition containing no infrared absorbing dye (manufactured by Takeo Corporation) Off-metal N silver 165 kg). (B) in FIG. 19 is the spectral reflectance of the second layer (6) in the present invention, and is described above by inkjet printing using white ink (LIOJET FV03 White manufactured by Toyo Ink Manufacturing Co., Ltd.) as a measurement sample. A PET film with a solid print was used. (C) in FIG. 19 is the spectral reflectance of the color material that does not contain the infrared absorbing dye in the present invention, and as a measurement sample, by magenta ink (LIOJET FV03 magenta manufactured by Toyo Ink Manufacturing Co., Ltd.) by inkjet printing, A PET film subjected to solid printing was used. (D) in FIG. 19 is the spectral reflectance of the color material containing the infrared absorbing pigment in the present invention. As a measurement sample, black ink (LIOJET FV03 Black, manufactured by Toyo Ink Manufacturing Co., Ltd.) is used to perform PET by inkjet printing. A film having a solid print was used.

  The spectral reflectance shown in FIG. 19 was measured using a self-recording spectrophotometer (manufactured by HITACHI, model U-4000).

  Comparing changes in spectral reflectance in a visible light region of 400 to 760 nm and an infrared region of 760 to 800 nm, the spectral reflectance in the substrate (a) is about 85% in the visible light region. Then, it is around 80%. The spectral reflectance of the white ink (b) is higher than that of the substrate (a) in both the visible light region and the infrared region except for the short wavelength in the visible light region. Further, the spectral reflectance of the magenta ink (c) is substantially constant at around 95% in the infrared region. The spectral reflectance of the black ink (d) is substantially constant at around 5% in the infrared region. At the same wavelength, the higher the spectral reflectance, the lower the density is visually recognized (whiter), and the lower the spectral reflectance, the higher the density (blackish) is visually recognized. When observed using an infrared camera, the substrate (a) is slightly black, the magenta ink (c) is whitish (substantially transparent), the white ink (b) is white, and the black ink (d) is Observed black.

(The principle of visual recognition of the second latent image)
FIG. 20 shows a state in which the print region (2) of the printed matter (1) formed by the halftone dot configuration of the third embodiment related to the present invention is observed through an infrared camera (hereinafter referred to as “under infrared light source”). It is a top view and a schematic diagram. The observation principle of the second latent image (18) under the infrared light source will be described with reference to FIG. As shown in FIG. 20 (a2), when the print region (2) is observed under an infrared light source, the second layer (6), which is the lower layer of the third layer (7), uses white ink. Since it is configured, it is observed white as described above. Moreover, since the 1st area | region (13) is comprised using the color material which does not contain an infrared rays absorption pigment | dye, it is observed white.

  In the case where the latent image portion (15) is formed using a colored color material that does not contain an infrared absorbing dye, the substrate (8) is provided via the cutout portion (9) of the second layer (6) as the lower layer. ) Is observed, and when the substrate (8) formed on the paper substrate by aluminum vapor deposition is used, as described above, the spectral reflectance is about 80% in the infrared region and is observed to be slightly black. Moreover, when a base material (8) contains an infrared rays absorption pigment | dye, it is observed black. Similarly, when the latent image portion (15) is formed using a colored color material containing an infrared absorbing dye, it is observed as black. Therefore, the first camouflage portion (16) needs to have a density comparable to that of the latent image portion (15) when observed under an infrared light source, and a colored color material appropriately containing an infrared absorbing dye. It will be formed using. In this case, when observed in the infrared region, the first camouflage portion (16) is observed to be slightly black.

  That is, the latent image portion (15) and the first camouflage portion (16) are observed slightly blackish in the infrared region. Therefore, the second region (14) is observed as a solid region (20) having a uniform concentration, as shown in FIGS. 20 (a1) and 20 (a2). That is, the first latent image (4) composed of the latent image portion (15) is not observed. Further, the third halftone dot portion (19a) is formed of a colored color material containing an infrared absorbing dye, and is observed in black in the infrared region as described above. On the other hand, the second camouflage portion (19b) is formed of a colored color material that does not contain an infrared absorbing dye, and is observed whitish in the infrared region as described above. Therefore, when the printed matter (1) is observed under an infrared light source, it is constituted by the third halftone dot portion (19a) with the solid region (20) having a uniform density constituted by the second region (14) as the background. The second latent image (18) thus made can be observed.

  As described above, under the infrared light source, when a glittering material containing an infrared absorbing dye is used for the base material (8), the solid region (20) can be observed, but the second latent image in the present invention. The image (18) refers only to the image formed by the third region (19).

  The case where the substrate (8) is observed to be slightly black in the infrared region and the case where the latent image portion (15) is formed using a colored color material containing an infrared absorbing dye will be described with reference to FIG. However, next, the base material (8) does not contain an infrared absorbing dye, has a high spectral reflectance in the infrared region (90% or more), and the latent image portion (15) is a colored color containing no infrared absorbing dye. The case where it forms using a material is demonstrated using FIG.

FIG. 21 is a plan view and a schematic view when the print region (2) of the printed matter (1) formed by the halftone dot configuration of the third embodiment related to the present invention is observed under an infrared light source. The principle by which the second latent image (18) can be observed under an infrared light source will be described with reference to FIG. As shown in FIG. 21 (a2), when the print region (2) is observed under an infrared light source, the second layer (6), which is the lower layer of the third layer (7), is configured using white ink. Therefore, it is observed white as described above. Moreover, since the 1st area | region (13) is comprised using the color material which does not contain an infrared rays absorption pigment | dye, it is observed white.

  The latent image portion (15) is formed using a colored coloring material that does not contain an infrared absorbing dye, and the base material (8) also does not contain an infrared absorbing dye, and has a high spectral reflectance in the infrared region (90%). From the above, it is observed whitish in the infrared region. Accordingly, the first camouflage portion (16) needs to be formed using a colored color material that does not contain an infrared absorbing dye, and is observed whitish when observed in the infrared region.

  That is, the latent image portion (15) and the first camouflage portion (16) are observed whitish in the infrared region. Therefore, as shown in FIGS. 21 (a1) and 21 (a2), the solid region (20) is not observed in the second region (14) and is observed as a uniform white image. That is, the first latent image (4) composed of the latent image portion (15) is not observed. Further, the third halftone dot portion (19a) is formed of a colored color material containing an infrared absorbing dye, and is observed in black in the infrared region as described above. On the other hand, the second camouflage portion (19b) is formed of a colored color material that does not contain an infrared absorbing dye, and is observed whitish in the infrared region as described above. Therefore, when the printed matter (1) is observed under an infrared light source, the second latent image (18) composed of the third halftone dot portion (19a) can be observed.

  The visible image (3) formed by the first region (13) of the third layer (7) of the present invention, the first latent image (4) formed by the latent image portion (15), and the third mesh The second latent image (18) formed by the dot (19a) can be appropriately set with characters, numbers, symbols, patterns, landscapes, etc., but the first latent image (4) In the case of letters, numbers, symbols, and patterns, it is preferable to form a positive image, and in the case of a person or landscape, it is preferable to form a negative image. Further, in the above description, the hollow portion (9a), the hollow portion (9b), the hollow portion (9c), the 2a concealing portion (12a), the 2a concealing portion (12b), and the 2a concealing portion (12c). ) Used a quadrilateral shape, but is not limited to a quadrilateral shape, such as a circular shape, a triangular shape, a square shape, a polygonal shape, a random shape, or Japanese Patent No. 3478474 filed by the present applicant. The disclosed halftone dot shape may be used.

  In addition, the shapes of the first region (13), the second region (14), and the third region (19) formed by the third layer (7) of the present invention are all rectangular in the above description. However, the present invention is not limited to a quadrangle, and the first region (13), the second region (14), and the third region (19) may be polygonal. For example, in FIG. 22, as an example of another polygon, the first region (13) is a hexagon, and the second region (14) and the third region (19) are triangles.

  In the shape example shown in FIG. 22, each region is triangular, and as described above, the third region (19) is not in the first region (13) but the second region. (14) are arranged in the same shape as the color separation region. Thus, the third region (19) is not limited to being disposed in the first region (13), and may be disposed in the second region (14). In addition, when arrange | positioning the 3rd area | region (19) in a 2nd area | region (14), it arrange | positions so that it may not overlap with a color separation area | region.

  In the above description, the original image of the first latent image (4) is color-separated into the respective color components of YMC, but R (red), G (green), and B (blue) in the RGB color mode. The second region (14) may be divided into three, and each of the RGB regions may be composed of YMC process ink, or may be composed of ink corresponding to RGB. Similarly, the original image of the first latent image (4) may be color-separated with two colors, and the second region (14) may be configured with two colors of special color inks.

  As a material for forming the halftone dot structure, known gravure ink, screen ink, process ink, ink for inkjet printer, and the like can be used.

  As a method for forming the first layer (5), the second layer (6), and the third layer (7), respectively, an offset printing method, a gravure printing method, a screen printing method, a flexographic printing method, an inkjet printer, A laser printer, metal vapor deposition, hot stamp, cold stamp, etc. are not particularly limited.

  Hereinafter, the printed matter having a latent image in the present invention will be described in detail with reference to examples. However, the present invention is not limited to the following examples, and may be a technical category described in the claims. Needless to say, it can be changed as appropriate.

  As Example 1, as shown in FIG. 1 (a), a gift certificate (1) having a printing region (2) according to the present invention formed in the lower left portion was produced. When this gift certificate (1) is observed in a diffused light area under a visible light source, the print area (2) shows the “NPB” of the Gothic body shown in FIG. 2 (a) and tilts the gift certificate (1). When viewed in the regular reflection light region, the print region (2) can visually recognize the “NPB” in the Mincho style shown in FIG. 2B as a full-color image.

  The base material (8) of the gift certificate (1) in the present Example 1 uses a photographic paper for inkjet printers (photo paper gloss made by EPSON), and in an area corresponding to the printing area (2) on the base material (8), A first layer (5) having a dot area ratio of 100% (solid) was formed using an ink jet printer (PX-G930 manufactured by EPSON) using gold ink (gold colloid ink manufactured by Nippon Paint Co., Ltd.).

  Next, using a white ink (LIOJET FV03 White manufactured by Toyo Ink Manufacturing Co., Ltd.) on the printing area (2) formed of gold ink, printing is performed by an inkjet printing apparatus (Patterning JET manufactured by Tritech Co., Ltd.) As shown in FIG. 4, in the first concealment region (10) and the second concealment region (11) for suppressing the gloss of the gold ink of the first layer, and further in the second concealment region, The second layer (6) was formed so as to have a region where the white ink was not printed ("recessed portion (9)" in the above-described embodiment). The cut-out portion (9) corresponds to YMC that is the three color components constituting the second region (14) in the third layer (7) formed on the second layer (6). Corresponding to the location, it consists of a cutout part (9a), a cutout part (9b) and a cutout part (9c).

  In addition, the 2a concealment part (12) excluding the first concealment area (10) and the cut-out part (9) was printed at a concealment area ratio of 100% (solid). The second concealment region (11) including the cutout portion (9) is a position corresponding to the second region (14) of the third layer (7) to be printed on the white ink. Yes.

  Next, process ink (LIOJET FV03 Cyan, Magenta, Yellow and Black, manufactured by Toyo Ink Manufacturing Co., Ltd.) is used on the second layer (6) formed with white ink as shown in FIG. With the halftone dot configuration, the third layer (7) having the pattern of FIG. 5A, that is, the first region (13) and the second region (14) were formed.

  In the halftone dot configuration shown in FIG. 5B, the area of the first region (13) is formed with an area corresponding to 30 × 30 pixels, and the second region (14) is 6 × 6. An area corresponding to a pixel was formed.

  The second area (14) is a color separation area divided by the three color components of YMC, and the second layer (6) below the second area (14) has the above-mentioned structure. As shown in the figure, the cutout portion (9) not printed with white ink is arranged, but in the diffused light region, the cutout portion (9) is formed under the second region (14). Is not visible.

  The second region (14) in the third layer (7) at a position corresponding to the hollowed portion (9) of the second layer (6) becomes a latent image portion (15), and is a regular reflection light region. The first latent image (4) is formed under the influence of the reflected light of the glittering first layer (5).

  In order not to make the first latent image (4) formed by the latent image portion (15) visible in the diffused light region, the second region (14) is a region other than the latent image portion (15). One camouflage portion (16) was formed to be the same color as the latent image portion (15) in the diffused light region. The color difference ΔE between the first camouflage portion (16) and the latent image portion (15) in the diffused light region (for example, the light receiving angle of 0 °) was 1.21.

  In addition, about the shape of the 1st halftone dot part (13a), it formed with the circular dot.

  When the printed region (2) of the gift certificate (1) formed by the above configuration is observed with the naked eye in the diffused light region under the visible light source, the visible image (3) shown in FIG. The first latent image (4) shown in FIG. 2 (b) was not visible.

  When the gift certificate (1) is tilted from the position to the specular reflection light area and the print area (2) is observed, the first latent image (4) shown in FIG. In addition, the visible image (3) shown in FIG.

  As Example 2, as shown in FIG. 23, a card-type certificate (1 ′) having a printing area (2 ′) according to the present invention formed in the lower right portion was produced. When this certificate (1 ′) is observed in the diffused light region under a visible light source, the “plurality of stars” shown in FIG. 24A is visually recognized in the print region (2 ′), and the certificate (1 ′) When the image is visually recognized in the specularly reflected light region with the tilted, the character “pass” shown in FIG. 24B is visually recognized in the print region (2 ′). 2 ′) can visually recognize a “smile” image as shown in FIG.

  The base material (8 ′) of the certificate (1 ′) according to the second embodiment changes brightness and / or color by changing the observation angle from the diffuse light region to the regular reflection light region with respect to the visible light source at a fixed position. The material in which the material changes was formed on a paper substrate by aluminum vapor deposition (manufactured by Takeo Corporation, 165 kg of off-metal N silver). Printing was performed on the base material (8 ′) with an ink jet printing apparatus (Patterning JET manufactured by Tritech Co., Ltd.). The halftone dot configuration of the first region (13) and the third region (19) in the print region (2 ′) is a halftone dot configuration of circular dots.

  Next, the area other than the area corresponding to the printing area (2 ′) on the base material (8 ′) is solid-printed using white ink (LIOJET FV03 White manufactured by Toyo Ink Manufacturing Co., Ltd.), and the printing area (2 ′) is A first concealing region (10 ′) and a 2a concealing portion (12 ′) for suppressing the brightness of aluminum vapor deposition of the substrate (8 ′) using the same white ink (described later); The concealed area ratio is such that the glitter of the base material (8 ′) can be visually recognized at a location adjacent to the concealed portion (12 ′) of the 2a (the position corresponding to the cutout portion (9) in Example 1). A second layer (6 ′) was formed so as to have a 2b concealing portion (17 ′).

  The first concealment area (10 ′) and the 2a concealment part (12 ′) were printed with a concealment area ratio of 100%, and the second concealment part (17 ′) was printed with a concealment area ratio of 10%. Further, the 2a concealing part (12 ') and the 2b concealing part (17') equally distribute the second region (14 ') of the third layer (7') to be printed on the white ink. And the positional relationship corresponding to the three color components of YMC.

  Next, a process ink (LIOJET FV03 Cyan, Magenta, Yellow, and Black, manufactured by Toyo Ink Manufacturing Co., Ltd.) is used on the entire surface of the second layer (6 ′) formed of white ink, and the third layer (7 ′) Was formed. About this 3rd layer (7 '), normal printing by a halftone dot was performed except printing area (2'), and the printing area (2 ') was made into the halftone dot structure in 2nd Embodiment mentioned above. .

  Note that at least the halftone dot configuration of the print region (2 ′) of the third layer (7 ′) is such that the first region (13 ′) has an area corresponding to 30 × 30 pixels, and the second region (14 ′ ) Is an area corresponding to 12 × 12 pixels, and the third region (19 ′) is formed with an area corresponding to 9 × 9 pixels.

  In the first region (13 ′), the first halftone dot portion (13a ′) is a circular dot, and was printed using process ink (LIOJET FV03 cyan, magenta and yellow manufactured by Toyo Ink Manufacturing Co., Ltd.). A visible image (3 ′) was formed by changing the area ratio between the first halftone dot portion (13a ′) and the region other than the first halftone dot portion (13a ′).

  As described above, the second region (14 ′) was equally divided by the color materials of the three color components of YMC. Under this second region (14 ′), the second concealment region (11 ′) for concealing the glitter of the substrate (8 ′) and the glitter of the substrate (8 ′) are visible. A second-b concealment portion (17 ′) having a concealment rate of a certain degree is formed. The second region (14 ′) at the position corresponding to the second b concealing portion (17 ′) forms the first latent image (4 ′) as a latent image portion (15 ′).

  In order not to make the first latent image (4 ′) formed by the latent image portion (15 ′) visible in the diffused light region, the first other than the latent image portion (15 ′) in the second region (14 ′). The camouflage portion (16 ′) was printed so as to be the same color as the latent image portion (15 ′) in the diffused light region. The first latent image (4 ′) was formed by changing the area ratio of the 2a concealing part (12 ′) and the 2b concealing part (17 ′) in the second layer (6 ′). The color difference ΔE between the latent image portion (15 ′) and the first camouflage portion (16 ′) under reflected light (diffused light) was 0.65.

  In the 3rd field (19 '), the 3rd halftone dot part (19a') was a circle dot, and it printed using black ink (Toyo Ink Manufacturing Co., Ltd. LIOJET FV03 black). The second camouflage portion (19b ′) was printed with process ink (LIOJET FV03 cyan, magenta, and yellow, manufactured by Toyo Ink Manufacturing Co., Ltd.) in a black color. The area ratio of the third halftone dot portion (19a ′) and the second camouflage portion (19b ′) was changed to form a second latent image (18 ′).

  FIG. 25 schematically shows the configuration of the print area (2 ′) in the certificate (1 ′) of the second embodiment and the configuration of areas other than the print area (2 ′). FIG. 25A shows a configuration of a region other than the print region (2 ′), and white ink is formed on the glittering first layer (5 ′) formed by vapor-depositing aluminum on paper. Is printed, and further, a halftone dot for forming a visible image (3) is printed thereon by process ink.

  FIG. 25 (b) shows the configuration of the print area (2 ′), and the first concealment area (10 ′) and the second a concealment section are formed on the first layer (5 ′) of glitter. (12 ') and the second b concealment part (17') are printed with white ink, and the first region (13 ') is printed on the first concealment region (10'), and the second concealment is performed. The second area (14 ') is printed on the part (12') and the second b concealing part (17 '), and the third area (19') is formed in the first area (13 '). Printed.

  By adopting such a positional relationship between the layer configuration and the halftone dot configuration, in the second region (14 ′), the glittering first layer (5 ′) through the second b concealing portion (17 ′). The first latent image formed by the latent image portion (15 ′) by changing the color difference ΔE between the latent image portion (15 ′) receiving the regular reflection light and the first camouflage portion (12 ′). 4 ′) can be visually recognized. In addition, since the glitter of the base material (8 ′) is suppressed by the white ink in the area other than the second b concealment portion (17 ′), the area is printed on the white ink without any glitter. A visible image (3 ′) is formed by the process ink.

  When the certificate (1 ′) produced in Example 2 is observed with the naked eye in the diffused light region under the visible light source where the visible light source is in a fixed position, the “plurality of stars” is visually recognized as the visible image (3 ′). The first latent image (4 ′) and the second latent image (18 ′) could not be visually recognized. Next, the certificate (1 ′) produced in Example 2 was observed with the naked eye in the specular reflection light region under the visible light source with the visible light source at a fixed position with different observation angles. As the image (4 ′), the characters “pass” were visually recognized as a full-color image. At this time, the visible image (3 ′) and the second latent image (18 ′) could not be visually recognized.

  Furthermore, the certificate (1 ′) produced in Example 2 was passed through an infrared light source (a CCD camera WAT-704R manufactured by Watec Co., Ltd. and a sharp cut filter IR-80 manufactured by Fuji Photo Film Co., Ltd.). And observed. The visible image (3 ′) and the first latent image (4 ′) could not be visually recognized, but the second latent image (18 ′) composed of the third halftone dot portion (19a ′). ) Was displayed dark (blackish), and “smile” could be clearly seen as the second latent image (18 ′).

DESCRIPTION OF SYMBOLS 1 Printed matter which has a latent image 2 Print area 3 Visible image 4 First latent image 5 First layer 6 Second layer 7 Third layer 8 Base material 9 Cut-out part 10 First concealment area 11 Second Concealment region 12 2a concealment portion 13 first region 13a first halftone dot portion 14 second region 15 latent image portion 16 first camouflage portion 17 2b concealment portion 18 second latent image 19 3rd area | region 19a 3rd halftone dot part 19b 2nd camouflage part 20 Solid area | region

Claims (7)

A printed area is formed on at least a portion of the substrate;
The printing area includes a first layer made of a material that changes color by changing an observation angle with respect to an illumination light source at a fixed position from a diffuse light area to a regular reflection light area;
Concealing the first layer so as not to change the color of the first layer even if the observation angle is changed from the diffused light region to the specularly reflected light region with respect to the illumination light source at a fixed position. A second layer having at least a concealing material;
On the second layer, a third layer formed of a colored material is formed.
The second layer includes a first concealment region and a second concealment region that conceal the first layer,
The second concealment region includes a 2a concealing portion to which the concealing material is applied and a hollow portion without the concealing material, or a 2a concealing portion and the second b to which the concealing material is applied. Concealed part of
The relationship between the concealment area ratios of the first concealment region, the 2a concealment unit, and the 2b concealment unit is as follows: first concealment region ≧ 2a concealment unit> 2b concealment unit,
A plurality of the third layers are arranged such that at least the first region and the second region are adjacent to each other,
The first region has a first halftone dot portion that forms a visible image with the colored material.
The second region is divided into at least two color separation regions by different color materials, and is stacked at the same position as the second concealment region, so that the second region is The latent image portion is divided into a latent image portion hitting the same position as the cutout portion or the second b concealing portion and a first camouflage portion hitting the same position as the second a concealing portion, and the latent image portion is divided into the cutout portion or the second b A first latent image is formed by arranging a plurality of the latent image portions, so as to receive a color change of the first layer through the concealing portion of
By forming the latent image portion and the first camouflage portion in the second region so as to have the same color in the diffused light region, the visible image is viewed and observed in the diffused light region under the visible light source. The color difference ΔE between the latent image portion and the first camouflage portion is changed by a predetermined value by changing the angle, and the first latent image formed by the latent image portion is visible. Printed matter having a latent image. 2. The printed matter having a latent image according to claim 1, wherein the latent image portion is formed with a light transmittance of 20% to 100%. The at least two color separation regions are formed in different colors by using colored materials of cyan, magenta, yellow, black, or a special color for each color separation region. A printed matter having the latent image of Item 2. The second area is divided into three color separation areas, and each of the color separation areas is formed of colored materials of cyan, magenta, and yellow, or the second area is divided into four color separation areas. 4. The printed matter having a latent image according to claim 3, wherein the printed matter is divided and each of the color separation regions is formed of colored materials of cyan, magenta, yellow, and black. By varying the size of the plurality of the cutout portions or the second b concealing portions, the size of the latent image portion is also proportionally different, and the first latent image becomes a gradation image. The printed matter having a latent image according to any one of claims 1 to 4. 6. The printed matter having a latent image according to claim 5, wherein the cutout portion having the different size or the second b concealment portion is formed corresponding to the at least two color separation regions. A third region comprising a third halftone dot portion and a second camouflage portion formed so as to surround the third halftone dot portion is formed in the first region or the second region. ,
The third halftone dot portion is formed of a colored color material containing an infrared absorbing dye to form a second latent image.
The second camouflage portion is formed of a color material that is the same color as the third halftone dot portion under a visible light source and does not contain an infrared absorbing dye,
7. The second latent image is further visible when the print area is observed under an infrared light source because at least the first area does not contain an infrared absorbing dye. A printed matter having the latent image according to claim 1.

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