JP2008290360A - Information carrier that can detect authenticity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information carrier for anti-counterfeiting having a high design property capable of authenticating authenticity in a visible light region and an infrared region using a general material and a general printing method.
An information carrier (1) prints a print image of C on a print image area (3) on white paper as a base material (2) with black ink containing chromofine black that cannot be seen in the infrared region. Then, the printed image of A is printed with a metallic gloss ink containing a glittering material thereon, and the printed image of B is further printed thereon with a transparent varnish or transparent ink, thereby changing the observation angle. Thus, the forgery prevention information carrier is provided in which the print image changes from “C” to “B” and changes to “A” when observed in the infrared region.
[Selection] Figure 1

Description

  The present invention, in the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards and passports, which are security printed matter that requires anti-counterfeiting effects, has given an effect that varies depending on the observation angle. The present invention relates to an information carrier for preventing forgery or for determining authenticity.

  In recent years, anti-counterfeiting elements and printing techniques having new design properties and high anti-counterfeiting effects have been desired for valuable printed matter that requires security. For this reason, color flip-flops that cause color changes depending on the viewing angle by blending special light-reflecting powders such as interference mica, oxidized flake mica, pigment-coated aluminum flakes, and optically changing flakes with ink and paint. There are many prints with excellent properties or those with an optical security element such as a hologram whose image changes depending on the observation angle.

  The anti-counterfeit printed matter exhibiting optical changes as described above is generally expensive and requires special equipment and materials, so an additional manufacturing process is required, and the cost is high. There was a problem.

  Therefore, in order to solve the above problems, the present applicant uses common and relatively inexpensive materials and simple printing means, and recognizes the human eye at a specific observation angle. Has filed an invention relating to an anti-counterfeit information carrier in which the information to be changed into completely different information by changing the observation angle (see, for example, Patent Document 1).

  The information carrier for anti-counterfeiting according to Patent Document 1 uses a commercially available silver-colored or gold-colored ink containing a relatively inexpensive aluminum powder or brass powder as a component, and a security that exhibits a hologram effect by a general printing means. The present invention is characterized by a structure in which an image is directly applied to a substrate of a printed material, and is a forgery-preventing and authenticity determining printed material having excellent cost performance and mechanical distribution strength.

  In the forgery prevention information carrier disclosed in Patent Document 1, as a first effect, a first printed image is formed by two glittering material layers having an appropriate density difference on the substrate. In the diffused light region, the amount of reflected light that reaches the eyes of the observer from both of the two glitter material layers becomes small, so that the first printed image can be easily recognized. . On the other hand, in the regular reflection light region, the amount of reflected light that reaches the eyes of the observer from both of the two glitter material layers becomes extremely large, making it difficult to visually recognize the first printed image.

  Furthermore, as a second effect, the first printed image formed in the above-described extremely dense glittering material layer having an area ratio and a color material having higher visible light absorption than the glittering material are used. In the second printed image formed by layering the color material layers with extremely sparse area ratios formed in this manner, the amount of reflected light reaching the eyes of the observer becomes small in the diffused light region. Nevertheless, it is difficult to visually recognize the difference in color tone and light reflectivity from the two layers, and the second printed image cannot be visually recognized because it is observed by human eyes as the same degree of stimulation. On the other hand, in the specularly reflected light region, the amount of reflected light reaching the viewer's eyes from the layer made only of the glittering material becomes extremely large, whereas a color material with high visible light absorption is superimposed on the glittering material layer. Since the amount of reflected light reaching the viewer's eyes from the layer is relatively small, the second printed image can be easily visually recognized by the color tone difference due to the difference in the amount of reflected light.

  Further, the present applicant has applied for a halftone print that cannot recognize an embedded image in the observation in the visible light region and can recognize the embedded image in the observation in the infrared region (see, for example, Patent Document 2). This technique is an effective means for preventing forgery because it is not noticed that an invisible embedded image is added to a visible image.

  The halftone print according to Patent Document 2 is visible and invisible using process basic four primary color inks of cyan (C), magenta (M), yellow (Y) and black (K) used in general commercial printing. In this method, an image is generated and an invisible image that cannot be recognized unless an appraisal device such as an infrared camera is used is difficult to print at a low cost. This invention is a black pigment mainly composed of carbon black that absorbs black (K) among the four basic color inks used in general commercial printing from the ultraviolet region to the infrared region, and absorbs infrared rays. The black (K) containing carbon black is obtained by observing with an identification device such as an infrared camera using black (K) obtained by superimposing cyan (C), magenta (M) and yellow (Y). The principle that an image composed of ink can be visually recognized is used.

  The security printed material that embeds an invisible image before the invention according to Patent Document 2 is printed by using ink mainly composed of carbon black that absorbs in the infrared region and chromofine black ink that does not absorb in the infrared region. However, according to this Patent Document 2, it can be easily produced by an ink jet printer provided with process basic four primary color inks.

Japanese Patent No. 3398758 Japanese Patent No. 3544536

  However, the invention according to Patent Document 1 has a forgery prevention information carrier that allows the first printed image to be visually recognized in the diffused light region and the second printed image to be confirmed in the regular reflected light region by superimposing the two effects. Although the body can be formed, it is necessary to precisely print the glitter material layer constituting the first print image and the color material layer constituting the second print image at the same pitch. Therefore, it is necessary to manufacture the first print image and the second print image while maintaining the quality appropriately.

  Further, in order to form the forgery prevention information carrier described in Patent Document 1, the glittering material layer constituting the first print image and the color material layer constituting the second print image are diffused light. It is necessary to determine the density difference of the appropriate area ratio so that the same color (approximate color) appears in the region. For this purpose, printing is performed by changing the color type and area ratio of the color material having a high visible light absorption property in various ways, and an optimal switching property can be obtained from the first print image to the second print image. A great deal of labor is required to determine the color and area ratio of a color material with high visible light absorption.

  In addition, since the two images can be visually recognized by using the reflected light depending on the observation angle, depending on the conditions such as the observation angle and the illuminating light, the visual state of the two images is affected. There were some problems with viewing a fully switched image.

  Further, in order to obtain an optimal image switching property, the area ratio of the second printed image using a color material having high visible light absorption must be formed in a specific range of 15 to 30%. Furthermore, since the first printed image is printed with regularity on the extremely dense glittering material layer of the first printed image, the second printed image is a comparison of characters and symbols that can be expressed as a binary image. Only simple design could be expressed.

  The present invention uses general and relatively inexpensive materials and printing methods, and is easily mass-produced. Further, since the information recognized by human eyes changes to different information by changing the observation angle, the present invention provides a forgery prevention information carrier that cannot be reproduced by a color copying machine.

  The present invention relates to an anti-counterfeit information carrier in which a base material having infrared reflectivity and a first print layer, a second print layer, and a third print layer are sequentially laminated on a print image area on the base material. The first print layer is a first print image composed of an image portion and a background portion that are printed with colored ink that has a color different from that of the substrate and does not absorb infrared rays, and a second print layer. The printed layer is a second printed image composed of an image portion and a background portion that are printed with an ink having a glittering material that absorbs infrared rays in a color different from that of the substrate, and the third printed layer is This is a third print image composed of an image portion and a background portion printed with transparent ink that does not absorb infrared rays, and the first print layer and the second print layer are arranged in the same size and shape within the print image region. And the third print layer is disposed on at least a part of the print image area. It is anti-counterfeit information bearing member characterized by that.

  In the forgery prevention information carrier of the present invention, the first print image has an area ratio of 15 to 100%, and the difference in area ratio between the image portion and the background portion is in the range of 15 to 50%. Is characterized in that the area ratio is 40 to 100% and the difference in area ratio between the image portion and the background portion is in the range of 10 to 20%.

  In the forgery prevention information carrier of the present invention, the colored ink for printing the first printed image and the ink having the glittering material for printing the second printed image have a black component, The black component of the ink has a higher color density than the black component of the ink having the glittering material.

  The anti-counterfeit information carrier of the present invention is characterized in that the third print image is a multi-tone image in which the gray scale is expressed within an area ratio of 0 to 100%.

  In the forgery prevention information carrier of the present invention, the image portion of the third print image is meaningful information having the authenticity of a logo mark, number, character, symbol or barcode, and the image of the third print image The difference in the area ratio between the portion and the background portion is 75% or more.

  In the forgery prevention information carrier of the present invention, at least a part of one or more of the first print image, the second print image and / or the third print image is formed by the size and density of a halftone dot shape. It is characterized by.

  In the information carrier for forgery prevention according to the present invention, at least a part of one or more of the first print image, the second print image, and / or the third print image is formed by thick and dense lines. It is characterized by being.

  In the forgery prevention information carrier of the present invention, at least a part of one or more of the first print image, the second print image, and / or the third print image is formed by wavy and thick and dense. It is characterized by.

  In the forgery prevention information carrier of the present invention, at least a part of one or more of the first print image, the second print image, and / or the third print image is formed by a thick and dense line in a broken line shape. It is characterized by.

  The anti-counterfeit information carrier of the present invention is such that the glittering material forming the second printed image is a glittering material of aluminum powder, copper powder, zinc powder, tin powder, brass powder or iron phosphide. It is the printing ink containing, It is characterized by the above-mentioned.

  The information carrier for forgery prevention according to the present invention is characterized in that the transparent ink forming the third printed image is any one of a transparent varnish, an ink varnish, a transparent ink, and a medium ink.

  The anti-counterfeit information carrier of the present invention is characterized in that the transparent ink for printing the third print image further contains a fluorescent material.

  The information carrier for anti-counterfeiting of the present invention is such that the fourth print image is formed on a part of the third print image with an ink containing a fluorescent material in a transparent ink for printing the third print image. Features.

Since this invention is the above structure, the following effect arises.
When the anti-counterfeit information carrier of the present invention is observed under visible light, the third printed image printed with the transparent ink is visually recognized in the specularly reflected light region, and the first printed with colored ink in the diffused light region. When the printed image is visually recognized and further observed in the infrared region, the second printed image printed with the ink having the glittering material can be visually recognized.

  In the present invention, since the third printed image is printed with transparent ink, the glitter material layer and the color material layer have the same color (approximate color) in the diffused light region as in the invention described in Patent Document 1. Since it is not necessary to determine the density difference of the appropriate area ratio that can be seen, it can be easily formed.

  In the present invention, since the third print image is printed with transparent ink, the third print image is slightly observed in the observation of the first print image in the diffused light region as in the invention described in Patent Document 1. The image is clearly switched from the first print image to the third print image without being visible.

  Since the third printed image of the present invention is not limited in gradation such as a specific area ratio as in the invention described in Patent Document 1, not only characters and simple symbols but also complex images such as face images and photographic images are used. An image can also be expressed by an image having gradation.

  The glitter material constituting the second print image absorbs infrared rays in the diffused light state in the infrared region, whereas the transparent ink or general ink constituting the first print image or the third print image is used. Since the process ink does not absorb infrared rays, only the second image can be visually recognized in the observation of the infrared region, and the camouflage that becomes the third print image with the ink that does not absorb infrared rays under the second print image. An image can be formed, and the observation image in the visible light region can be made different from the observation image in the infrared region.

  Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and various other modes can be implemented within the scope of the technical idea described in the claims. .

  FIG. 1 shows an information carrier (1) of the present invention. FIG. 2 shows a first printed image (4) of the present invention. FIG. 3 shows a second printed image (5) of the present invention. FIG. 4 shows a third printed image (6) of the present invention. FIG. 5 shows the positional relationship between the illumination light source (7), the viewpoint (8), and the information carrier when observing the information carrier of the present invention. FIG. 6 shows the positional relationship among the viewpoint (8), the infrared light source (9), the infrared camera (10), and the information carrier when the information carrier of the present invention is observed in the infrared region.

  FIG. 7 shows an observation diagram depending on the viewpoint angle for observing the print image area (3) of the present invention. FIG. 8 is a cross-sectional view of the information carrier (1) of the present invention, and more specifically, a cross-sectional view taken along the line XX of the information carrier (1) of FIG. FIG. 9 is a cross-sectional view of eight laminated pattern regions that are temporarily considered in the embodiment of the present invention. FIG. 10 is a view illustrating each layered pattern when an area where the background portion (5b) of “A” is superimposed on the background portion (4b) of “C” in the diffused light region is set to the reference value 0 in the embodiment of the present invention. The color difference ΔE of the area is shown. FIG. 11 is a diagram illustrating an example in which, in the embodiment of the present invention, each of the stacks when the reference value 0 is set to the region where the background portion (5b) of “A” is superimposed on the background portion (4b) of “C” in the regular reflection light region. The color difference ΔE of the pattern area is shown.

  FIG. 12 shows the information carrier (27) in the first embodiment. FIG. 13 shows a first print image (29) in the first embodiment. FIG. 14 shows a second print image (30) in the first embodiment. FIG. 15 shows a third print image (31) in the first embodiment. FIG. 16 shows a third printed image (32) observed in the regular reflection light region in the first embodiment. FIG. 17 is an observation diagram depending on the viewpoint angle for observing the print image area (28) in the first embodiment.

(Summary of Invention)
The information carrier (1) of the present invention prints the first print image (4) of FIG. 2 on the substrate (2), and prints the second print image (5) of FIG. Further, the third printed image (6) of FIG. 4 is printed thereon, and when the information carrier (1) of FIG. It is made.

  In the present invention, the first printed image printed with colored ink that does not absorb infrared rays and the second printed image printed with ink having a glittering material having infrared absorbing properties have the same size and shape. Since the third print image printed with a transparent ink that does not absorb infrared rays is disposed in all or part of the same region, the print image region in the present invention is, It shows a region where the first print image and the second print image are printed on all or part of the substrate.

  The base material is paper that reflects infrared rays, the second printed image (5) is ink that absorbs infrared rays and has gloss with visible light, and the first printed image (4) and the third printed image. The image (6) is required to use ink that does not absorb infrared rays. The ink that does not absorb infrared light here is ink that does not contain an infrared absorbing material. Further, by changing the area ratio of each printed layer, one effect that is a feature of the present invention is exhibited. At this time, the contrast of the first print image (4) serving as the first print layer is enhanced and the contrast of the second print image (5) serving as the second print layer is suppressed. The image (5) is camouflaged, and “C” that is the first print image (4) is visually recognized in visible light, and “A” that is the second print image (5) cannot be visually recognized. However, the second printed image (5) has such a contrast that “A” can be visually recognized when observed in the infrared region.

  FIG. 7 shows a special effect of the information carrier (1) of the present invention. By changing the angle of the viewpoint for observing the information carrier (1) from the diffused light region to the specularly reflected light region, the first printed image (4) is changed from "C" to the third printed image (6). The visual information changes to “B”, and “A” that is the second print image (5) can be visually recognized by observing in the infrared diffused light region. Therefore, three images “A”, “B”, and “C” can be visually recognized by two different observation methods.

  The base material (2) is not limited to white paper, but may be any material as long as it has a flat surface capable of carrying a printed image such as high-quality paper, coated paper, or a plastic card and exhibits reflection characteristics in the infrared region. .

  Also, the printing method is not particularly limited, such as wet offset printing, dry offset printing, letterpress printing, waterless planographic printing, gravure printing, flexographic printing, screen printing or intaglio printing.

  Further, in the following description, in the printing area of a certain area, the area ratio that can hide the lower layer print image is expressed as an area ratio in%, and particularly the case where the lower layer print image can be hidden due to the size and density of the halftone dot shape. Although described as a halftone dot area ratio, the area ratio is not limited to the halftone dot shape, and may be a line area shape, a wavy line shape, or a broken line shape area ratio.

(Configuration of the first print layer)
Here, a specific configuration of each print layer will be described.
First, the first print image (4) of FIG. 2 serving as the first print layer is printed with ink having characteristics that do not absorb in the infrared region. As the ink that does not absorb in the infrared region, for example, it can be obtained by blending chromofine black (manufactured by Dainichi Seika Kogyo Co., Ltd.), an infrared reflecting material that is a known material, but it is a process ink for commercial printing. The material to be blended is not limited to this as long as it has a characteristic that does not absorb in the infrared region, such as cyan (C), magenta (M), and yellow (Y).

  At this time, the dot area ratio of the first printed image (4) is 15 to 100%, the dot area ratio of the image portion (4a) of “C” is 50 to 100%, and the background portion of “C”. The dot area ratio of (4b) is 15 to 65%, and printing is performed in the range where the difference between the dot area ratio of the image portion and the background portion is 15 to 50%.

(Configuration of the second print layer)
The second printed image (5) in FIG. 3 serving as the second printed layer is printed with an ink made by blending a glittering material having infrared absorption characteristics. Examples of the glittering material include silver, bluish gold, and reddish gold materials containing aluminum powder, copper powder, zinc powder, tin powder, iron phosphide, and the like, and ink that absorbs in the infrared region. For example, an ultraviolet curable metallic glossy ink “Toyo Ink Manufacturing Co., Ltd. UV FLASH DRY FD OL Silver” can be used, but it has a visible light gloss and absorbs in the infrared region. It is only necessary to have this, and the present invention is not limited to this.

  At this time, the dot area ratio of the second print image (5) is 40 to 100%, the dot area ratio of the image portion (5a) of “A” is 50 to 100%, and the background portion of “A”. The halftone dot area ratio of (5b) is 45 to 85%, and printing is performed in a range where the difference between the halftone dot area ratios of the image portion and the background portion is 10 to 20%.

(Configuration of the third print layer)
The image portion (6a) of B forming the third print image (6) of FIG. 4 serving as the third print layer is printed with a transparent ink that does not absorb infrared rays. As this transparent ink, for example, a transparent varnish, an ink varnish, a transparent ink, a medium ink, a translucent colored ink, or a translucent colored varnish can be used. T & A TOKA UV Matte OP Varnish 3H ”. However, any transparent ink that does not absorb infrared rays may be used, and the present invention is not limited to these. Further, the ink is not limited to the ultraviolet curable type, and may be a printing ink such as an oxidation polymerization type ink, a penetrating ink, a superheated drying ink, and an evaporation drying ink.

  The third printed layer is printed as a multi-tone image with a dot area ratio ranging from 0 to 100%. In this case, the image portion is printed with transparent ink, and the background portion is not printed. It is good.

(Definition of diffused light region, specular light region, and infrared region)
FIG. 5 shows three positional relationships of the illumination light source (7), the viewpoint (8), and the information carrier (1) when the information carrier (1) is observed in the diffused light region and the specularly reflected light region. It is illustrated. When the information carrier (1) is observed at the position of the viewpoint (8) in the vertical direction of 0 ° when the illumination light source (7) has an incident angle of −45 °, observation of the diffused light region (a) occurs. When the body (1) is observed at the position of the viewpoint (8) tilted from 0 ° to 45 ° in the vertical direction when the illumination light source (7) has an incident angle of −45 °, observation of the specularly reflected light region (b) Become. Further, as shown in FIG. 6, when the incident light of the infrared light source (9) with respect to the information carrier (1) is set to −45 ° and the information carrier (1) is observed through the infrared camera (10) from 0 ° in the vertical direction. Since infrared diffused light is observed, observation of the infrared region (c) is performed. The infrared camera is not particularly limited as long as the infrared region can be observed. For example, an infrared ink visualization apparatus (Glory Kogyo Co., Ltd.) including an illumination light source having a wavelength of 920 nm and a video monitor can be used.

  As shown in FIG. 7, the information carrier (1) in the present embodiment, when viewed in the diffuse light region, the image “C” is visually recognized, and when observed in the specularly reflected light region, the image “B” is visually recognized. When observed in the infrared diffused light region, the image “A” is visually recognized.

  This can be explained using the color difference ΔE in the observation of the diffused light region (a) and the observation of the regular reflection region (b) shown in FIG. The color difference ΔE is the distance between two colors in the Lab space. The smaller the color difference ΔE, the more difficult it is to recognize the difference between the two colors, and the greater the color difference ΔE, the easier it is to recognize the difference between the two colors. Evaluation method.

  The layer structure of the laminated pattern of the printed image region (3) in the information carrier (1) in FIG. 8 is considered to be a region overprinted with a three-layer structure. "C" image portion (4a) printed in the above, "C" background portion (4b) printed with black ink at a halftone dot area ratio of 50%, and metallic glossy ink printed at a dot area ratio of 70% "A" ”Background portion (5b),“ A ”image portion (5a) printed with metallic gloss ink at a dot area ratio of 80%,“ B ”image portion (6a) with a transparent varnish dot area ratio of 100%, It consists of a background portion (6b) of “B” with a transparent varnish dot area ratio of 0%, and three layers of either the image portion or the background portion of each of “A”, “B”, and “C” are overlaid. Consists of areas. Therefore, eight stacked pattern regions that can be considered as combinations of three-layer printed images of the present invention are extracted, and the color difference ΔE between the eight stacked pattern regions in the observation of the diffused light region (a) and the observation of the regular reflection region (b). , And explain that the image switches.

FIG. 9 is a cross-sectional view of eight different stacked pattern regions of the information carrier (1).
In FIG. 9A, the background portion (5b) of “A” is superimposed on the background portion (4b) of “C”, and the background portion (6b) of “B” that is not actually printed is further formed thereon. 9B is a cross-sectional view of the region (11), and FIG. 9B is a region (12) in which the background portion (5b) of “A” and the image portion (6a) of “B” are superimposed on the background portion (4b) of “C”. FIG. 9C is a cross-sectional view of a region (13) in which an image portion (5a) of “A” is superimposed on a background portion (4b) of “C”, and FIG. FIG. 9E is a cross-sectional view of a region (14) in which an image portion (5a) of “A” and an image portion (6a) of “B” are superimposed on the background portion (4b), and FIG. 9 (e) is an image portion (4a of “C”). ) Is a cross-sectional view of the region (15) in which the background portion (5b) of “A” is overlaid, and FIG. 9 (f) shows the background portion (5b) of “A” and the image portion (4a) of “C”. Sectional drawing of the area | region (16) which accumulated the image part (6a) of "B", FIG. 9G is a cross-sectional view of a region (17) in which the image portion (5a) of “A” is superimposed on the image portion (4a) of “C”, and FIG. 9 (h) is an image portion (4a) of “C”. ) Is a cross-sectional view of a region (18) in which the image portion (5a) of “A” and the image portion (6a) of “B” are overlapped.

  The area (11) in FIG. 9 (a) is defined as a reference value 0, which is one color of the color difference, and the other seven stacked pattern areas are set as the other color, and the variable angle spectrophotometric system GCMS-4 type [Murakami Color difference ΔE was measured using a color technology laboratory.

(Measurement of diffused light region)
In order to reproduce the observation (a) of the diffused light region on the apparatus, the incident light of the light source with respect to the measurement sample is fixed at −45 °, the light receiving angle is changed from −10 ° to 0 °, and the specular reflection is performed. In order to reproduce the observation (b) of the area on the apparatus, the incident light of the light source with respect to the measurement sample was fixed at −45 °, and the light receiving angle was changed from 40 ° to 50 °.

A graph (19a) in FIG. 10 is a measurement result of the observation (a) of the diffused light region in FIG.
The area (11) in FIG. 9A is set to a reference value 0 for the color difference ΔE, and the value of the broken line (20) indicating the color difference ΔE with respect to the area (12) in FIG. The value of the broken line (21) indicating the color difference ΔE from the area (14) in d) is around 2.3, and the value of the broken line (22) indicating the color difference ΔE from the area (13) in FIG. Each of the areas of the background portion (4b) in which the first layer was “C” around 3 and the color was relatively close to the reference area (11) in FIG. 9A.

  On the other hand, the region (11) in FIG. 9 (a) is set to the reference value 0 of the color difference ΔE, and the value of the broken line (23) indicating the color difference ΔE from the region (18) in FIG. The value of the broken line (24) indicating the color difference ΔE from the region (16) in FIG. 9F is around 7.1, and the value of the broken line (25) indicating the color difference ΔE from the region (15) in FIG. Is about 9.5, the value of the broken line (26) indicating the color difference ΔE from the region (17) in FIG. 9G is about 12.2, and each of the image portions (4a) in which the first layer is “C” The area has a relatively large value, that is, a color different from the reference area (11) in FIG. 9A.

  In the observation (a) of the diffused light region, when the region (11) in FIG. 9A in which the background portion (5b) of “A” is superimposed on the background portion (4b) of “C” is set to the reference value 0, The color difference ΔE is 0 regardless of the combination of the second layer “A” print image (5) and the third layer “B” print image (6) superimposed on the “C” background (4b). .6 to 3.3, which are relatively small values, the second layer “A” print image (5) and the third layer are displayed in the “C” image portion (4a). Since the color difference ΔE with the region where the print image (6) of “B” is overlapped has a relatively large value of around 6.6 to 12.2, the print image (5) of “A” In addition, the printed image (6) of “B” is difficult to visually recognize, and only the color difference between the image portion (4a) of “C” and the background portion (4b) of “C” can be strongly visually recognized. The first layer to be printed by the key results in image is recognized as "C".

(Measurement of specular reflection region)
Next, the graph (19b) in FIG. 11 is a measurement result of the observation (b) of the regular reflection region in FIG.
When the area (11) in FIG. 9A is set to a reference value 0 for ΔE, the value of the broken line (23) indicating the color difference ΔE from the area (18) in FIG. The value of the broken line (21) indicating the color difference ΔE from the area (14) of (d) is around 73.7, the background part (5b) of "A" and the background part (5b) of "B" in the image part (4a) of "C" The value of the broken line (24) indicating the color difference ΔE from the region (16) in FIG. 9 (f) where the image portion (6a) is superimposed is around 70.7, and the background portion (4b) of “C” is “A”. The value of the broken line (20) indicating the color difference ΔE between the background portion (5b) and the region (12) in FIG. 9B where the image portion (6a) of “B” is superimposed is around 66.8, which is the third layer. Each area of the image portion (6a) with “B” is a relatively large value, that is, a color different from the reference area (11) in FIG. 9A.

  On the other hand, the value of the broken line (25) indicating the color difference ΔE with respect to the area (15) in FIG. 9E is around 41.2, and the value of the broken line (26 indicating the color difference ΔE with respect to the area (17) in FIG. ) Is around 32.3, the value of the broken line (22) indicating the color difference ΔE from the region (13) in FIG. 9C is around 12.7, and the third layer of the background image (6b) of B Each region had a relatively small value, that is, a color relatively close to the reference region (11) in FIG.

  In the observation of the specular reflection area (b), no matter what combination the first layer C print image (4) and the second layer A print image (5) are, the third layer B image portion (6a ), The color difference ΔE shows a relatively large value of 66.8 to 74.5, whereas the B image portion (6a) that becomes the B background portion (6b) in the third layer ) Is not overprinted, the color difference ΔE is a relatively small value, so it is difficult to visually recognize the print image (5) of “A” and the print image (4) of “C”. Since only the color difference between the image portion (6a) and the background portion (6b) of B can be strongly visually recognized, an image “B” on the third layer printed with the transparent varnish is recognized in the observation with specular reflection light. .

  That is, in the print image area (3) in FIG. 1, the image of “C” becomes a latent image as shown in FIG. 7 by changing the angle of the viewpoint to be observed from the diffuse light area to the regular reflection light area. ”Changes to the image.

  The B image portion (6a) of the third print image (6) formed by the transparent varnish is configured as a solid print here and the B background portion (6b) is not printed. 6a) and the background portion (6b) of B may be an image having a dot area ratio difference of 75% or more, or a multi-tone image in which the image portion and the background portion are not separated is the same in observation with specular reflection light. Result is obtained.

(Infrared observation)
Next, the observation (c) of the infrared region in FIG. 6 will be described. The infrared region is a wavelength region of 750 nm or more that is generally higher in wavelength than visible light and cannot be visually recognized by the naked eye. An infrared image can be divided into a region that reflects or transmits infrared rays (a so-called region that does not absorb infrared rays) and a region that absorbs infrared rays. When images of these regions are observed with an infrared camera or the like, a region that reflects or transmits infrared light is viewed as white, and a region that absorbs infrared light is viewed as black, so that a black and white image can be viewed.

  When the information carrier (1) is observed in the infrared diffused light region using the infrared camera (10), the reflected light of the infrared rays from the metallic gloss ink layer to the infrared camera (10) is less, compared with other layers. It can be said that it is a region that absorbs infrared rays because it is visually recognized as black. Since the halftone dot area ratios of the image portion (5a) and the background portion (5b) of the printed image (5) of “A” are different, the infrared reflected light by the infrared camera (10) in each portion is different. An infrared image of “A” appears.

  When the information carrier (1) in the embodiment of the present invention is copied by a color copier, the visual sensitivity is completely different from the original information carrier (1), and changes in image due to light reflectivity and observation angle are shown. In addition, the information carrier (1) in the embodiment of the present invention is also excellent in the effect of preventing forgery by color copying because the image of “A” cannot be visually recognized in observation under an infrared light source.

Next, the color of the colored ink that prints the first print image will be described.
As for “C” which is the first print image (4), “C” must be visually recognized in the diffused light region and “C” must disappear in the specularly reflected light region. Further, “A”, which is the second printed image (5) overprinted thereon, is visible in the infrared region, and is camouflaged in both the diffused light region and the specular light region under visible light. However, the optimum printing conditions differ depending on the base material, ink, glitter material, halftone dot area ratio of the background portion and the image portion, and combinations thereof. Therefore, a preferred color of colored ink for carrying out the present invention will be described.

(Suitable dot area ratio when the first printed image is black ink)
On the white coated paper as the base material (2), the halftone dot area ratio of the image portion (4a) of the first printed image “C” with black ink, and the halftone dot area ratio of the background portion (4b) of “C” The result of attempting printing by changing the combination of the halftone dot area ratio of the image portion (5a) of the second printed image “A” and the halftone dot area ratio of the background portion (5b) of “A” with the metallic gloss ink Table 1 below.

  The conditions for obtaining good switchability of the image are that the first print image (4) has a dot area ratio of 100% to 50% in the image portion (4a) of “C” and a background portion of “C” ( The dot area ratio of 4b) is 55 to 15%, and the difference of the dot area ratio of the image portion (4a) of “C” and the background portion (4b) of “C” is 15% to 50%. It was. In the second print image (5), the dot area ratio of the image portion (5a) of “A” is 100% to 80%, and the dot area ratio of the background portion (5b) of “A” is 85%. The difference in the halftone dot area ratio between the image portion (5a) of “A” and the background portion (5b) of “A” was 10% to 20%.

  The second print image (5) is camouflaged, and the print region (3) in which the second print image (5) is overprinted on the first print image (4) is “C” in the observation with visible light. When it is confirmed that switching from the visible state to the latent image state is performed, the image “B”, which is the third printed image (6) in FIG. 15, is printed on the second printed image (5). By doing so, an information carrier (1) can be formed.

(Suitable dot area ratio when the first printed image is red ink)
Next, the information carrier (1) when the first print image (4) that becomes the camouflage image is red ink will be described.

  The information carrier (1) prints the print image of “C” that is the first print image (4) with red ink on the print image region (3) on the white paper that is the base material (2), A printed image of “A”, which is the second printed image (5), is printed thereon with a metallic gloss ink containing a glittering material, and a third printed image (6), which is further transparent ink, is printed thereon. The printing of the “B” printed image is performed in the same manner as in the black ink described above.

  However, the “C” image part (4a) and the “C” background part (4b) constituting the first print image (4) are red ink (for example, “Dainippon Ink and Chemicals, Inc.” Dai Cure Co., Ltd. Scepter DT Process Red N ") is printed by wet offset printing.

  As for “C” which is the first print image (4), “C” must be visually recognized in the diffused light region and “C” must disappear in the specularly reflected light region. Furthermore, “A”, which is the second printed image (5) overprinted thereon, is visible in the infrared region, and is camouflaged in both the diffused light region and the specular light region under visible light. However, the optimum printing conditions differ depending on the base material, the ink reflected or transmitted in the infrared region, the glitter material, the dot area ratio of the background portion and the image portion, and a combination thereof.

  Therefore, on the white coated paper which is the base material (2), the dot area ratio of the image portion (4a) of “C” by red ink and the dot area ratio of the background portion (4b) of “C” by red ink. The results of printing by changing the combination of the halftone dot area ratio of the image portion (5a) of “A” with the metallic gloss ink and the halftone dot area ratio of the background portion (5b) of the “A” with the metallic gloss ink are as follows. It is Table 2 of these.

  The first print image (4) was obtained under the condition that a good switchability of the image was obtained. The dot area ratio of the image portion (4a) of “C” with red ink was 80% to 50%, and “ The dot area ratio of the background portion (4b) of C "is 65 to 15%, and the dot area ratio difference between the image portion (4a) of" C "and the background portion (4b) of" C "is 15%. -50%. In the second print image (5), the dot area ratio of the image portion (5a) of “A” is 100% to 80%, and the dot area ratio of the background portion (5b) of “A” is 85%. The dot area ratio difference between the image portion (5a) of “A” and the background portion (5b) of “A” was 10% to 20%.

  Confirmed that the print area (3) obtained by overprinting the second print image (5) on the first print image (4) switches from the visible state of “C” to the latent image state in observation under visible light. If possible, the information carrier (1) can be formed by printing the print image of “B”, which is the third print image (6) with transparent ink, on the second print image (5). it can.

(Suitable dot area ratio when the first printed image is indigo ink)
Next, the information carrier (1) when the first printed image (4) that becomes the camouflage image is indigo ink will be described.

  The information carrier (1) prints the print image of “C” as the first print image (4) with indigo ink on the print image region (3) on the white paper as the base material (2), A printed image of “A”, which is the second printed image (5), is printed thereon with a metallic gloss ink containing a glittering material, and a third printed image (6), which is further transparent ink, is printed thereon. The printing of the “B” printed image is performed in the same manner as in the black ink described above.

  However, the “C” image portion (4a) and the “C” background portion (4b) constituting the first print image (4) are indigo ink (for example, “Dainippon Ink Chemical Co., Ltd.”) that reflects in the infrared region. DaiCure Co., Ltd. Scepter DT Process Indigo UV ") is used for printing by wet offset printing.

  As for “C” which is the first print image (4), “C” must be visually recognized in the diffused light region and “C” must disappear in the specularly reflected light region. Furthermore, “A”, which is the second printed image (5) overprinted thereon, is visible in the infrared region and is camouflaged in both the diffused light region and the specularly reflected light region under visible light. However, the optimum printing conditions differ depending on the substrate, the ink reflected or transmitted in the infrared region, the glitter material, the dot area ratio of the background portion and the image portion, and a combination thereof.

  Therefore, on the white coated paper which is the base material (2), the dot area ratio of the image portion (4a) of “C” by indigo ink, and the dot area ratio of the background portion (4b) of “C” by indigo ink The results of printing by changing the combination of the halftone dot area ratio of the image portion (5a) of “A” with the metallic gloss ink and the halftone dot area ratio of the background portion (5b) of the “A” with the metallic gloss ink are as follows. Table 3 below.

  The conditions for obtaining good switchability of the image were that the first printed image (4) had an image area (4a) of “C” with indigo ink having a dot area ratio of 50%, and “C” with indigo ink. The dot area ratio of the background portion (4b) is 35 to 15%, and the dot area ratio difference between the image portion (4a) of “C” and the background portion (4b) of “C” is 15% to 50%. %Met. In the second printed image (5), the dot area ratio of the image portion (5a) of “A” is 100% to 80%, and the dot area ratio of the background portion (5b) of “A” is 80% to 50%. The halftone dot area ratio difference between the image portion (5a) of “A” and the background portion (5b) of “A” was 10% to 20%.

  Confirmed that the print area (3) obtained by overprinting the second print image (5) on the first print image (4) switches from the visible state of “C” to the latent image state in observation under visible light. If possible, the information carrier (1) can be formed by printing the print image “B”, which is the third print image (6) using the transparent ink, on the second print image (5). it can.

  As a result, in the first print image (4), the halftone dot area ratio of the “C” image portion (4a) is 100% to 50%, and the halftone dot area ratio of the “C” background portion (4b) is 65 to 65%. The difference in the halftone dot area ratio between the image portion (4a) of “C” and the background portion (4b) of “C” was 15% to 50%. In the second print image (5), the dot area ratio of the image portion (5a) of “A” is 100% to 50%, and the dot area ratio of the background portion (5b) of “A” is 85% to 40%. %, And the difference in the dot area ratio between the image portion (5a) of “A” and the background portion (5b) of “A” is 10% to 20%. The obtained printing condition range was reached.

If the optimum printing condition range is not satisfied, for example, if the first print image (4) has a halftone dot area ratio of less than 15%, the image of “A” to be camouflaged is observed in the diffused light region. It will be visually recognized.
When the difference in the dot area ratio between the image portion (4a) of “C” and the background portion (4b) of “C” constituting the first print image (4) is less than 15%, the contrast is insufficient. It is difficult to distinguish the “C” image by observing the diffuse light region.
When the difference in the halftone dot area ratio between the “C” image portion (4a) and the “C” background portion (4b) constituting the first print image (4) exceeds 50%, the specular reflection light region The image “C” is not lost by observation, and the switchability of the image cannot be obtained.
Further, when the second printed image (5) has a portion with a halftone dot area ratio of less than 40%, in the observation of the specular reflection light region, the “C” image remains visible without disappearing. Switchability cannot be obtained.
When the difference in the halftone dot area ratio between the image portion (5a) of “A” and the background portion (5b) of “A” constituting the second printed image (5) is less than 10%, the infrared region in FIG. In the observation, the image of “A” is difficult to visually recognize because of insufficient contrast.
When the dot area ratio difference between the image portion (5a) of “A” and the background portion (5b) of “A” constituting the second print image (5) exceeds 20%, the diffused light region of the visible light region Since the camouflage image “C” and the image “A” are also visually recognized, the image “A” cannot be used as a latent image.

  In addition, the area ratio of the second printed image (5) formed by the metallic gloss ink is that the image portion (5a) of “A” is dense and the background portion (5b) of “A” is sparse, The density may be reversed. Similarly, the density of the “C” image portion (4a) and the “C” background portion (4b) may be reversed for the first print image (4) formed with colored ink.

  The counterfeit prevention information carrier of the present invention is, for example, a bank note, passport, driver's license, stock certificate, bond, check, ID card, credit card, gift certificate, gift certificate, pass ticket, coupon ticket, stamp, The medium is not particularly limited as long as it is a medium that requires an anti-counterfeiting effect such as a visa, postcard, seal, or book, and the object of the present invention can be formed.

Hereinafter, the present invention will be described in more detail by way of examples.
Example 1
FIG. 12 shows an information carrier (27) according to the first embodiment.
The information carrier (27) is the first print image (29) of FIG. 13 with black ink reflected in the infrared region on the print image region (28) on the white paper as the substrate (2). The printed image of “A” which is the second printed image (30) in FIG. 14 is printed on the printed image of “A” with the metallic gloss ink containing the glittering material, and further the transparent varnish etc. Then, the “rose” image which is the third print image (31) of FIG.

  At this time, the second print image (30) is camouflaged with the first print image (29), and “A”, which is the second print image (30), is not visually recognized in the visible light. “R”, which is the print image (29), is visually recognized.

  FIG. 17 shows a special effect of the information carrier (27). By changing the angle of the viewpoint for observing the information carrier (27) from the diffused light region to the specularly reflected light region, the first printed image (29) is changed from "R" to the third printed image (31). The visual information changes to “rose”, and “A” that is the second printed image (30) can be visually recognized by observing in the infrared diffused light region. Therefore, the three images “R”, “rose”, and “A” can be visually recognized.

  The first printed image (29) in FIG. 13 was printed by a wet offset printing method using black ink prepared by blending chromofine black reflected in the infrared region. At this time, the “R” image portion (29a) of the first print image (29) has a halftone dot area ratio of 80%, and the “R” background portion (29b) has a halftone dot area ratio of 65%.

  The second printed image (30) in FIG. 14 is wet offset printing using an ultraviolet curable metallic glossy ink “Toyo Ink Manufacturing Co., Ltd. UV FLASH DRY FD OL Silver” made by blending a glittering material. Printing is done by the method. At this time, the “A” image portion (30a) of the second print image (30) is printed with a halftone dot area ratio of 70%, and the “A” background portion (30b) is printed with a halftone dot area ratio of 55%. Is given.

  Further, the “rose” image of the third printed image (31) in FIG. 15 is overprinted on the second printed image (30), and is an ultraviolet curable transparent varnish “ Using “T & A TOKA UV Matte OP Varnish 3H”, a multi-tone image using a halftone dot area ratio of 0 to 100% is applied by a wet offset printing method.

  Here, when the information carrier (27) is observed in the diffused light region and the regular reflection region, the three positional relationships of the illumination light source (7), the viewpoint (8), and the information carrier (27) are as shown in FIG. It is the same. When the illumination light source (7) and the viewpoint (8) are in the observation (a) of the diffused light region, an image “R” in FIG. 13 is visually recognized on the information carrier (27), and the illumination light source (7) and When the viewpoint (8) is in the observation (b) of the specularly reflected light region, a “rose” image is visually recognized as shown in FIG.

  As for the observation in the infrared region, similarly to FIG. 6, the incident light of the infrared light source (9) on the information carrier (27) is set to −45 °, and the information carrier (1) is passed through the infrared camera (10) from 0 ° in the vertical direction. ) Is observed, the image “A” is visually recognized.

  In Example 1, the second printed image is formed using the metallic glossy ink “Toyo Ink FLASH DRY FD OL Silver”, but is not limited to the metallic glossy ink, and “T & K TOKA UV NO3 Silver”. The same effect can be obtained by using “Dainippon Ink Chemical Co., Ltd. New Champion Gold (Akaguchi)” or “Dainippon Ink Chemical Co., Ltd. New Champion Gold (Aoguchi)”.

  In the first embodiment, the second printed image is formed on the coated paper with a metallic gloss ink containing a glittering material, and the third printed image is formed with a transparent varnish having a low glossiness. In addition, a digital gloss meter GM-3D [Murakami Color Technology is used to measure the gloss of the metallic gloss ink forming the second printed image, the transparent varnish coating forming the third printed image, and the two coated films. Manufactured by Research Laboratory Co., Ltd.] and the light source was measured at 60 °.

  The glossiness of 100% area ratio of the metallic gloss ink is 30, and the glossiness of the film of 100% area ratio of the transparent varnish (T & A TOKA UV mat OP varnish 3H) is 13. The color difference ΔE between the metallic gloss ink and the transparent varnish is greatly affected by the brightness difference ΔL due to the gloss difference. Therefore, in order to obtain a large color difference ΔE, the difference in gloss between the glitter material film and the transparent film is at least It is desirable that the number be 10 or more, and below that, the contrast of the third printed image in the regular reflection light region is greatly reduced. The greater the difference in glossiness between the glitter material film and the transparent film, the higher the visibility of the third printed image in the specular reflection region, so there is a difference in glossiness between the two films. It is desirable to use a material that grows. In Example 1, a transparent varnish (T & A TOKA UV mat OP varnish 3H) having a lower gloss than that of the glittering material was used. For example, a transparent varnish having a higher gloss than the glittering material (New Champion High Gloss OP manufactured by DIC) was used. Even if varnish is used, the switch effect of the present invention is produced. However, in the case where an ink having a higher gloss than the glittering material is used for the third printed image, the third printed image appears as an image whose density is reversed in a completely regular reflection light region. It is desirable to form the printed image on the glittering material by reversing the gradation.

  In Example 1, the black ink made by blending chromofine black that reflects the colored ink forming the first printed image in the infrared region, the red ink that reflects in the infrared region, “Dainippon Ink and Chemicals, Inc. Dai Cure Co., Ltd. Scepter DT Process Red N ”and indigo ink reflecting in the infrared region“ Dai Nippon Ink Chemical Industry Co., Ltd. DaiCure Scepter DT Process Indigo UV ”are not limited to these colors, but other colors For example, similar results were obtained with green color reflected in the infrared region. Therefore, the colored ink that forms the first printed image is not limited to red or indigo, does not exhibit absorption in the infrared region, and has the area ratio described in the best mode for carrying out the invention. Any color ink that can camouflage the second printed image within the range of the above-described range may be used.

  However, when a colored ink having a remarkably low concealment property such as yellow is selected for the first print image, the second print image cannot be camouflaged regardless of the combination of the area ratios. Table 4 shows the values of the YMCK color density component when the color of the metallic gloss ink constituting the second printed image and the color of the ink used for the first printed image are measured by Spectrolino (Gretag Macbeth). The concealment can be estimated from the measurement result of the black component (K value).

  The K value of yellow ink is as low as 0.06 compared to the K value of 0.35 of the metallic gloss ink that constitutes the second printed image to be camouflaged, so the second printed image cannot be camouflaged, and black ink and red ink In addition, colored inks having a K value higher than the K value of metallic luster ink, such as indigo ink, can be camouflaged. Therefore, the colored ink that can be used for the first printed image is not limited to black, red, and indigo, and may be any colored ink that has a higher K value than the metallic gloss ink.

  Further, by adding a fluorescent material to the transparent ink, it is possible to enhance the designability of the information carrier and the forgery prevention effect. For example, this is a case where the fourth print image is formed with a transparent ink obtained by adding a fluorescent material to a part of an image expressed with the transparent ink. However, since these materials are added and the third printed image can be visually recognized in the diffused light region, the clear image switch effect that is a feature of the present invention cannot be obtained. It is necessary to keep the color difference ΔE in the diffused light region semi-transparent with a value of about 5 or less using a coloring pigment having a low light absorption property or an infrared absorbing material having a low color density.

The information carrier in the embodiment of the present invention is shown. The 1st printing image in embodiment of this invention is shown. The 2nd printing image in embodiment of this invention is shown. The 3rd printing image in embodiment of this invention is shown. The positional relationship of an illumination light source, a viewpoint, and an information carrier when observing the information carrier of the present invention is shown. The viewpoint when observing the information carrier of the present invention in the infrared region, the positional relationship between the infrared camera and the information carrier is shown. The observation figure depending on the viewpoint angle which observes the printing image area | region in embodiment of this invention is shown. Sectional drawing in the broken line of X of the information carrier in embodiment of this invention is shown. Sectional drawing of eight lamination | stacking pattern area | regions considered in embodiment of this invention is shown. In the embodiment of the present invention, the color difference ΔE of each laminated pattern region is shown when the reference value 0 is set to the region where the background portion (5b) of A is superimposed on the background portion (4b) of C in the diffused light region. In the embodiment of the present invention, the color difference ΔE of each laminated pattern region is shown when the region where the background portion (5b) of A is superimposed on the background portion (4b) of C in the regular reflection light region is set to the reference value 0. 1 shows an information carrier in Example 1. Fig. 3 shows a first print image in Example 1. 2 shows a second print image in the first embodiment. 3 shows a third print image in the first embodiment. The 2nd printed image observed in the regular reflection light area | region in Example 1 is shown. The observation figure depending on the viewpoint angle which observes the printed image in Example 1 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information carrier 2 of embodiment of this invention Base material 3 Print image area | region 4 in information carrier of embodiment of this invention 1st print image 4a in information carrier of embodiment of this invention of embodiment of this invention Image portion 4b of A which is the first print image on the information carrier The background portion 5 of A which is the first print image on the information carrier of the embodiment of the present invention The second portion of the information carrier of the embodiment of the present invention Printed image 5a B image portion 5b as the second printed image in the information carrier of the embodiment of the present invention B background portion 6 as the second printed image in the information carrier of the embodiment of the present invention Third printed image 6a on the information carrier of the embodiment of the present invention The third print image C of the third printed image on the information carrier of the embodiment of the present invention Third print on the information carrier of the embodiment of the present invention The back of C, which is an image Part 7 Illumination light source 8 View point 9 Infrared light source 10 Infrared camera 11 The background part (5b) of “A” is superimposed on the background part (4b) of “C”, and the background of “B” that is not actually printed on the background part (5b) A region 12 defined as a portion (6b) A region 13 where a background portion (5b) of "A" and an image portion (6a) of "B" are superimposed on a background portion (4b) of "C" 13 A background portion (4b) of "C" ) With the image portion (5a) of “A” overlaid on (13)
14 Region 15 where “A” image portion (5a) and “B” image portion (6a) overlap each other on “C” background portion (4b) Background of “A” on image portion (4a) of “C” Region 16 where the portion (5b) is overlaid Region 17 where the background portion (5b) of “A” and the image portion (6a) of “B” are overlaid on the image portion (4a) of “C” 17 4a) The area 18 where the image part (5a) of “A” is overlapped The area where the image part (5a) of “A” and the image part (6a) of “B” are overlapped with the image part (4a) of “C” 19a Graph 19b showing a color difference ΔE from another region when the region (11) is set to the reference value 0 in the diffused light region 19b Other region when the region (11) is set to the reference value 0 in the regular reflection light region A graph 20 showing the color difference ΔE between the region (11) and the region (12). A broken line 21 showing the color difference ΔE between the region (11) and the region (14). 22 A polygonal line 23 indicating the color difference ΔE between the region (11) and the region (13) 23 A polygonal line 24 indicating the color difference ΔE between the region (11) and the region (18), and a color difference ΔE between the region (11) and the region (16). Polyline 25 Polygonal line 26 indicating the color difference ΔE between the region (11) and the region (15) Polygonal line 27 indicating the color difference ΔE between the region (11) and the region (17) Information carrier 28 of Example 1 Printed image of Example 1 Region 29 First printed image 30 of Example 1 Second printed image 31 of Example 1 Third printed image 32 of Example 1 Observation when the information carrier of Example 1 is observed in the specular reflection light region The figure is shown.

Claims (13)

An anti-counterfeit information carrier in which a base material having infrared reflectivity and a first print layer, a second print layer, and a third print layer are sequentially laminated on a print image region on the base material. The first print layer is a first print image having a color different from that of the base material and an image portion printed with colored ink that does not absorb infrared rays and a background portion, and the second print layer. The print layer is a second print image having a color different from that of the base material and an image portion and a background portion printed with an ink having a glittering material that absorbs infrared rays, and the third print layer Is a third print image composed of an image portion and a background portion printed with a transparent ink that does not absorb infrared rays, and the first print layer and the second print layer have the same size in the print image region. The third print layer is arranged in the shape and shape, and the print image Anti-counterfeit information bearing member and characterized in that it is disposed on at least a portion of the region. The first print image has an area ratio of 15 to 100%, and the difference between the area ratio of the image portion and the background portion is 15 to 50%. The second print image has an area ratio of 40 to 40%. The counterfeit-preventing information carrier according to claim 1, wherein the difference in area ratio between the image portion and the background portion is in the range of 10 to 20% at 100%. The colored ink for printing the first printed image and the ink having the glittering material for printing the second printed image have a black component, and the black component of the colored ink is the The information carrier for forgery prevention according to claim 1 or 2, wherein the color density is higher than that of the black component of the ink having the glittering material. 4. The forgery-preventing information carrier according to claim 1, wherein the third print image is a multi-tone image expressed by gradation within an area ratio of 0 to 100%. In the third print image, the image portion of the third print image is meaningful information having authenticity of a logo mark, a number, a character, a symbol, or a barcode, and the image portion of the third print image The counterfeit-preventing information carrier according to claim 1, 2 or 3, wherein a difference in area ratio between the image area and the background portion is 75% or more. The at least part of one or more of the first print image, the second print image, and / or the third print image is formed by a halftone dot size and density. The information carrier for preventing forgery according to 2, 3, 4 or 5. The at least part of one or more of the first print image, the second print image, and / or the third print image is formed by thick and dense lines having a line shape. The information carrier for preventing forgery according to 1, 2, 3, 4 or 5. 2. At least a part of one or more of the first print image, the second print image, and / or the third print image is formed by wavy line thick and thin and dense. The information carrier for preventing forgery according to 2, 3, 4 or 5. The at least part of one or more of the first print image, the second print image, and / or the third print image is formed by a thick and thin line having a broken line shape. The information carrier for preventing forgery according to 1, 2, 3, 4 or 5. The glittering material forming the second printed image is a printing ink containing a glittering material of any of aluminum powder, copper powder, zinc powder, tin powder, brass powder or iron phosphide. The information carrier for preventing forgery according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9. The transparent ink for forming the third printed image is any one of a transparent varnish, an ink varnish, a transparent ink, and a medium ink. 9. An information carrier for preventing forgery according to 9 or 10. The counterfeit according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, further comprising a fluorescent material in the transparent ink for printing the third print image. Information carrier for prevention. Item 1, 2, wherein a part of the third print image is formed with a fourth print image using an ink containing a fluorescent material in the transparent ink for printing the third print image. 3, 4, 5, 6, 7, 8, 9, 10 or 11 forgery prevention information carrier.

Images