JP2009113223A - Information carrier allowing discrimination of authenticity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information carrier for preventing forgery, allowing discrimination of authenticity and having high design properties by using a general material and a general printing system. <P>SOLUTION: A printing image (4) is printed with an ink having low visible light absorbing properties on a white paper being a substrate (2), a printing image (5) is printed thereon with a metallic luster ink containing a lustrous material, and thereon, a printing image (6) is printed in layers with a transparent vanish, a transparent ink or the like. The information carrier allowing discrimination of authenticity made as described above allows a person to see two images in a diffusion light region, and one image in the observation in the normal reflection region by changing an angle of observation. <P>COPYRIGHT: (C)2009,JPO&INPIT

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.

  However, there was no printed matter in which three images could be visually recognized by changing the viewing angle of the viewpoint in visible light.

Japanese Patent No. 3398758

  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.

  Furthermore, there were printed materials in which two images could be visually recognized by changing the viewing angle of the viewpoint in visible light, but there were no printed materials in which three images could be observed.

  The present invention uses general and relatively inexpensive materials and printing methods, and is easily mass-produced. In addition, since information recognized by human eyes changes to other information by changing the observation angle, an information carrier that cannot be reproduced by a color copying machine is provided.

  The present invention is an information carrier capable of authenticating authenticity in which a first print layer, a second print layer, and a third print layer are sequentially laminated on a print image region on one surface of a substrate. The first print layer is a first print image composed of an image portion and a background portion which are printed with a colored ink having a color different from that of the substrate and having low visible light absorption, and the second print layer. Is a second printed image composed of an image portion and a background portion printed with an ink containing a glittering material in a color different from that of the substrate, and the third printed layer includes an image portion printed with a transparent ink and It is a third print image consisting of only the background portion or the image portion, 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 An information carrier capable of authenticating authenticity, characterized by being arranged in at least a part of a print image area .

  The information carrier capable of authenticating authenticity of the present invention has a halftone dot area ratio of the image portion of the first print image of 50% and a halftone dot area ratio of the background portion of 20%. It is a glittering material, and is a second printed image having a dot area ratio of 80% in the image area and a dot area ratio in the background area of 65%.

  Also, the information carrier capable of authenticating authenticity of the present invention is characterized in that the colored ink having low visible light absorption for printing the first print image is white, yellow, light blue or pastel color. To do.

  The information carrier capable of authenticating the authenticity of the present invention comprises a black ink having a low visible light absorptivity for printing the first print image and a black ink having a glittering material for printing the second print image. And the black component of the colored ink has a lower color density than the black component of the ink having the glittering material.

  The information carrier capable of authenticating authenticity according to the present invention is characterized in that the third print image is a multi-tone image in which the tone is expressed within the range of the area ratio of 0 to 100%.

  The information carrier capable of authenticating authenticity according to the present invention is such that the image portion of the third print image is meaningful information having the authenticity of a logo mark, a number, a character, a symbol, or a barcode, and the third print image The difference in area ratio between the image portion and the background portion is 75% or more.

  In the information carrier capable of authenticating the authenticity 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 has a halftone dot size and density, It is characterized in that it is formed by any one of line-shaped thick and dense, wavy-shaped thick and dense, broken-line thick and dense.

  The information carrier capable of determining authenticity 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 capable of authenticating authenticity of the present invention forms a fourth print image with an ink in which a fluorescent material is contained in a transparent ink for printing the third print image on a part of the third print image. It is characterized by that.

  Since this invention is the above structure, the following effect arises. When the information carrier capable of determining authenticity of the present invention is observed under visible light, the image portion of the third printed image printed with the transparent ink is visually recognized in the specular reflection light region, and bright in the diffuse light region. The image portion of the second print image printed with the ink having the conductive material and the image portion of the first print image printed with the colored ink having low visible light absorption 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 second print image in the diffused light region as in the invention described in Patent Document 1. The image is clearly switched from the second 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.

  Further, the first printed image is printed with colored ink having low visible light absorption, the second printed image is printed with ink having a glittering material, and the third printed image is printed with transparent ink. When the viewpoint is changed from the observation of the specular reflection region to the observation of the specular reflection light region, the second printed image by the glittering material, the first printed image by the colored ink having low visible light absorption, the third printed image by the transparent ink And three printed images can be visually recognized.

  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 an observation diagram depending on the viewpoint angle for observing the print image area (3) of the present invention. FIG. 7 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. 8 shows the information carrier (12) in the first embodiment. FIG. 9 shows a first print image (14) in the first embodiment. FIG. 10 shows a second print image (15) in the first embodiment. FIG. 11 shows a third print image (16) in the first embodiment. FIG. 12 is an observation diagram depending on the viewpoint angle for observing the print image area (13) in the first embodiment.

(Summary of Invention)
More specifically, FIG. 1 shows an information carrier (1) of the present invention. The configuration of the information carrier (1) is to print the first print image (4) of FIG. 2 on the base material (2), print the second print image (5) of FIG. The third printed image (6) in FIG. 4 is printed thereon, and the cross section at the XX portion of the information carrier (1) in FIG. It is made.

  In the present invention, the region of the first printed image (4) printed with colored ink having low visible light absorption and the region of the second printed image (5) printed with ink having a glittering material are: It is preferable that the layers are stacked in the same size and shape. As long as the effect of the present invention is obtained, the size and shape of the region of the first print image (4) and the region of the second print image (5) may be different.

  The base material (2) uses a coated paper having a color different from that of the first print image (4) or the second print image (5), and the second print image (5) reflects visible light regularly. The first printed image (4) is colored ink with low visible light absorption, and the third printed image (6) is transparent that is not visible in the diffused light region. It is an essential condition to use ink. The colored ink having a low visible light absorption here is preferably a colored ink such as white, yellow, light blue or pastel color. The pastel color here is generally a well-known pastel color, which is a light color with low absorptivity. Further, by adjusting the dot area ratio of the image portion and / or the background portion of each printed layer, one effect that is a feature of the present invention is exhibited.

  Further, the contrast between the image portion (4a) and the background portion (4b) of the first print image (4) is emphasized, and the contrast between the image portion (5a) and the background portion (5b) of the second print image (5). Therefore, in the observation of the diffused light region described later, “C” that is the image portion (4a) of the first print image (4) and the image portion (5a) of the second print image (5). A certain “A” is visible. At this time, in the diffused light region, although the image portion (4a) of the first print image (4) is located below the second print image (5), the effect that can be visually recognized is the first print image (4). This can be realized by the ink characteristics used for the image (4) and the second print image (5) and the contrast difference between the image portion and the background portion.

  FIG. 6 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, “C” which is the image portion (4a) of the first printed image (4) in the diffused light region. “A”, which is the image portion (5a) of the second print image (5), while “B”, which is the image portion (6a) of the third printed image (6), in the regular reflection light region. Is visible. Note that the two images that can be viewed in the diffused light region can be viewed by being combined in the diffused light region, but each image can be recognized by adjusting the viewing angle. Therefore, by selecting the observation method, three images “A”, “B”, and “C” can be visually recognized.

  The substrate (2) is not limited to white paper, but has a flat surface capable of carrying a print image such as high-quality paper, coated paper, or a plastic card, and the first print image and the second print. Anything different in color from the image may be used.

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

(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 colored ink having low visible light absorption. Examples of the colored ink having low visible light absorption include colored inks such as white, yellow, light blue, and pastel colors. In the process ink for commercial printing, yellow (Y) is suitable.

  The image portion (4a) of “C” and the background portion (4b) of “C” constituting the first print image (4) are yellow ink “Dai Nippon Ink Chemical Co., Ltd. Dai Cure Scepter DT Process Transparent Yellow” Is printed by wet offset printing, the dot area ratio of the image portion (4a) of “C” is 50%, and the dot area ratio of the background portion (4b) of “C” is 20%. It was.

(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. Examples of the glittering material include silver, bluish gold, and reddish gold materials containing, for example, aluminum powder, copper powder, zinc powder, brass powder, tin powder, or iron phosphide. A metallic gloss ink of the type “Toyo Ink Manufacturing Co., Ltd. UV FLASH DRY FD OL Silver” can be used. However, the present invention is not limited to this as long as it has gloss with visible light and absorbs in the infrared region. At this time, printing is performed such that the halftone dot area ratio of the image portion (5a) of “A” is 80% and the halftone dot area ratio of the background portion (5b) of “A” is 65%.

(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 transparent ink. 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 that has a matte tone with reduced gloss. There is a UV curable transparent varnish “T & A TOKA UV Matt OP Varnish 3H”. However, it is not limited to the ultraviolet curable type, and may be a printing ink such as an oxidation polymerization type ink, a penetrating type ink, a superheated drying ink or an evaporation drying ink.

  The third printed layer is printed as a gradation image with a dot area ratio in the range of 0 to 100%. In this case, the image portion is printed with transparent ink, and the background portion is not printed. Also good.

(Definition of diffuse light region and specular light region)
FIG. 7 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) was observed at the position of the viewpoint (8) tilted from 0 to 45 degrees in the vertical direction when the illumination light source (7) had an incident angle of -45 degrees, the specularly reflected light region was observed (b). Defined as a case.

  As shown in FIG. 6, the information carrier (1) in the present embodiment can visually recognize the images “A” and “C” when viewed in the diffused light region, and the image “B” when observed in the specularly reflected light region. Visible.

  This can be explained by using the lightness L * in the observation of the diffused light region (a) and the observation of the regular reflection region (b) shown in FIG. The lightness L * is the lightness L * of the CIELAB color system, measured using a variable angle spectrocolorimetric system GCMS-4 (manufactured by Murakami Color Research Laboratory Co., Ltd.) with reference to the coated paper as the base material. did.

(Visibility of specularly reflected light region by brightness measurement)
In the observation of the specular reflection light region, three layers of a first printing layer made of ink with low visible light absorption, a second printing layer made of ink of glittering material, and a third printing layer made of transparent ink were obtained. When the lightness L * of the applied sample is measured, the first printed layer and the second printed layer exhibit high lightness L *, and therefore the lightness L * is high in both the image portion and the background portion. The color attributed to can not be visually recognized. The third print layer exhibits low lightness L *, but is transparent, so it originally has almost no color due to saturation or hue, and the third print image only slightly appears.

  In the observation of the regular reflection light region of the information carrier (1) of the present invention, the image portion (5a) and the background portion of the two print layers are reflected by the light regularly reflected by the first print layer and the second print layer. In both cases (5b), the lightness L * is a very high numerical value, and the image portions (4a, 5a) and the background portions (4b, 5b) can only be visually recognized in the same color. On the other hand, since the value of the lightness L * transmitted through the transparent ink layer can be controlled by the density of the halftone dot area ratio of the third printed layer overprinted thereon, the third halftone dot area ratio is high. The image portion (6a) of the third print layer has a low lightness L * and the background portion (6b) of the third print layer with a low halftone dot area ratio has a high lightness L *. Can be formed. From this, in the observation of the regular reflection light region, the third printed image (6) composed of the transparent ink layer is visually recognized.

(Visibility of diffused light area by brightness measurement)
In observing the diffused light region, three layers are applied: a first printed layer made of ink having low visible light absorption, a second printed layer made of ink of glittering material, and a third printed layer made of transparent ink. When the lightness L * of the sample was measured, the lightness L * of each layer showed a low value, so that the first printed layer and the second printed layer are visually recognized as having a hue due to saturation or hue. Therefore, the image can be visually recognized. On the other hand, since the 3rd printing layer which consists of transparent inks is transparent, the hue resulting from a saturation or a hue is weak and cannot be visually recognized.

  In the observation of the diffused light region of the information carrier (1) of the present invention, since the third printed layer is a transparent ink, the colors of the first printed layer and the second printed layer which are the lower layers are visually recognized. As a matter of course, the first printed image (5) having a stronger color is predominantly visually recognized. In particular, the ink having low visible light absorption that forms the first printed image and the ink that includes the glittering material that forms the second printed image have a large brightness increase curve from the diffuse reflection region to the regular reflection region. Because of the difference, there is a specific area where the brightness value is reversed between the two inks. In this region, the first image whose brightness is kept lower than the second image whose brightness has increased is dominantly viewed. In addition, a predetermined difference is provided in the halftone dot area ratio between the image portion (4a) and the background portion (4b) of the printed image (4) constituted by the first print layer, and further, the ink having low visible light absorption is used. By configuring, both the first print image (4) and the second print image (5) can be visually recognized in the diffused light region.

(Visibility in diffused light region by color density component measurement)
Next, the principle that both the first print image (4) and the second print image (5) can be visually recognized in the diffused light region will be described with reference to the color density. Table 1 shows the values obtained by measuring the color density component of the colored ink used for the first print image and the color density component of the metallic gloss ink constituting the second print image by Spectrolino (manufactured by Gretag Macbeth).

  From Table 1, the Bk value, C value, M value, and Y value of the metallic gloss ink, the Bk value of the black ink, the red ink, and the indigo color ink, which are high visible light absorbing inks having a high Bk value, C Three or more values among the value, M value, and Y value indicate large values. This indicates that the color of black ink, red ink and indigo ink is stronger than that of metallic gloss ink, and the second printed image (5) is black ink, red ink and indigo ink. This means that camouflaging can be performed by the first print image (4) including the like. On the other hand, the yellow ink, which is an ink having a low Bk value and a low visible light absorption property, has a Bk value, a C value, and an M value that are smaller than the metallic gloss ink. The print image (5) cannot be camouflaged, and not only the second print image (5) but also the first print image (4) can be viewed at the same time. Therefore, in order to make the second print image (4) visible in the diffused light region, it is preferable to use an ink having low visible light absorptivity for the first print image (4).

  Therefore, as shown in FIG. 6, the image portion (6a) of the third print image (6) is visible in the regular reflection region, and the image portion (1) of the first print image (4) is visible in the diffuse reflection region. 4a) and the image portion (5a) of the second print image (5) can be visually recognized. As measurement conditions, when the incident light of the light source with respect to the measurement sample is fixed at −45 °, the range of the light reception angle from 0 ° to about 30 ° is a diffuse reflection light region, and the light reception angle is around 45 °. The range is a regular reflection light region.

  In addition, the B image portion (6a) of the third print image (6) formed by the transparent varnish has a gradation design here and the B background portion (6b) is not printed. An image having a halftone dot area ratio difference between the portion (6a) and the background portion (6b) of B may be 75% or more, or a gradation image in which the image portion and the background portion are not separated can be observed with specular reflection light. Similar results are obtained. The image portion (6a) may be a solid image.

  When the information carrier (1) in the embodiment of the present invention is copied by a color copier, the visibility is completely different from the original information carrier (1), and changes in the image due to light reflectivity and observation angle are shown. Therefore, the information carrier (1) in the embodiment of the present invention is excellent in the effect of preventing forgery by color copying.

  The authenticity-identifiable 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, The medium is not particularly limited as long as it is a medium that requires the anti-counterfeit effect such as a stamp, a visa, a postcard, a seal, or a book, and can be formed by the configuration of the present invention.

  Hereinafter, the present invention will be described in more detail by way of examples.

Example 1
FIG. 8 shows the information carrier (12) in the first embodiment. The information carrier (12) prints the printed image “R”, which is the first printed image (14) of FIG. 9, on the coated paper, which is the base material (2), with yellow ink having low visible light absorption. A printed image of “A”, which is the second printed image (15) of FIG. 10, is printed on the metallic gloss ink containing the glittering material, and the printed image of FIG. The “rose” image, which is the third print image (16), was overlaid and printed.

  The first printed image (14) in FIG. 9 was printed by a wet offset printing method using yellow ink “Dai Nippon Ink Chemical Co., Ltd. Dai Cure Scepter DT Process Transparent Yellow” having low visible light absorption. At this time, the “R” image portion (14a) of the first print image (14) has a halftone dot area ratio of 50%, and the “R” background portion (14b) has a halftone dot area ratio of 20%. Yes.

  The second printed image (15) in FIG. 10 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 image portion (15a) of “A” in the second print image (15) has a halftone dot area ratio of 80%, and the background portion (15b) of “A” has a halftone dot area ratio of 65%. Is printed.

  Furthermore, the “rose” image of the third printed image (16) in FIG. 11 is overprinted on the second printed image (15), and is an ultraviolet curable transparent varnish “T & A” which is a transparent ink. Using “TOKA UV mat 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, the three positional relationships of the illumination light source (7), the viewpoint (8), and the information carrier (13) when observed in the diffused light region and the specularly reflected light region are the same as in FIG. When the illumination light source (7) and the viewpoint (8) are in the observation (a) of the diffused light region, the images “A” and “R” are visually recognized as shown in FIG. 12, and the illumination light source (7) and the viewpoint (8) are viewed. ) Is in the observation (b) of the regular reflection light region, a “rose” image 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 Example 1, a second printed image (15) is formed on a coated paper with a metallic glossy ink containing a glittering material, and a third printed image (16) is formed with a transparent varnish having a low glossiness. ing. In order to measure the glossiness, paying attention to two films, a metallic gloss ink film that forms the second printed image (15) and a transparent varnish film that forms the third printed image (16). The light source was measured at 60 ° using a digital gloss meter GM-3D (Murakami Color Research Laboratory).

  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 preferable that the number is 10 or more, and below that, the contrast of the third printed image (16) in the regular reflection light region is greatly reduced. The greater the difference in gloss between the film of the glittering material and the transparent film, the higher the visibility of the third printed image (16) in the specular reflection light region. It is preferable to use a material with a large degree of difference.

  In Example 1, the colored ink that forms the first printed image (14) is the yellow ink “Dai Nippon Ink Chemical Co., Ltd. Dai Cure Scepter DT Process Transparent Yellow”, but the color ink is limited to this color. Rather, similar results were obtained with other colors of white, light blue or pastel. Therefore, the colored ink that forms the first printed image is not limited to yellow, but is an ink having low visible light absorption and the second printed image (15 in the observation of the diffuse reflected light region). Color inks that can be camouflaged.

  However, it is difficult to camouflage the second print image (15) when a highly concealed colored ink such as black ink, red ink, or deep blue ink is selected for the first print image.

  Further, by adding a fluorescent material to the transparent ink, it is possible to enhance the designability and anti-counterfeiting effect of the information carrier. 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, if the third print image (16) can be visually recognized in the diffused light region due to the addition of these materials, 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 by using a coloring pigment having a low light absorption property such as light blue or an infrared absorbing material having a low color density.

It is a figure which shows the information carrier in embodiment of this invention. It is a figure which shows the 1st print image in embodiment of this invention. It is a figure which shows the 2nd print image in embodiment of this invention. It is a figure which shows the 3rd print image in embodiment of this invention. It is a figure which shows the positional relationship of the illumination light source when observing the information carrier of this invention, a viewpoint, and an information carrier. It is a figure which shows the observation figure depending on the viewpoint angle which observes the printing image area | region in embodiment of this invention. It is a figure which shows sectional drawing in the broken line of X of the information carrier in embodiment of this invention. 1 is a diagram illustrating an information carrier in Example 1. FIG. FIG. 3 is a diagram illustrating a first print image in Embodiment 1. FIG. 6 is a diagram illustrating a second print image in the first embodiment. FIG. 6 is a diagram illustrating a third print image in the first embodiment. FIG. 4 is a diagram illustrating an observation diagram depending on a viewpoint angle for observing a print image region in the first embodiment.

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 third print image of the illumination light source 8 viewpoint 12 Example 1 of the information carrier 14 a second print image 16 Example 1 of the first print image 15 Example 1 Example 1

Claims (9)

An information carrier capable of authenticating authenticity in which a first print layer, a second print layer, and a third print layer are sequentially laminated on a print image region on one surface of a substrate, The printed layer is a first printed image composed of an image portion and a background portion, which is printed with a colored ink having a different color from the base material and has low visible light absorption, and the second printed layer is The second printed image is composed of an image portion printed with an ink containing a glittering material in a color different from the base material and a background portion, and the third printed layer is an image portion printed with a transparent ink. And the third print image consisting of only the background portion or the image portion, wherein the first print layer and the second print layer are arranged in the same size and shape within the print image region, and The print layer is disposed in at least a part of the print image area. Authenticity discrimination possible information carrier. The first print image has a halftone dot area ratio of the image portion of 50% and a halftone dot area ratio of the background portion of 20%, and the second print layer is made of a glitter material and has a halftone dot area of the image portion. The information carrier according to claim 1, wherein the information carrier is a second printed image having a rate of 80% and a halftone dot area rate of the background portion of 65%. The authenticity can be determined according to claim 1 or 2, wherein the colored ink having low visible light absorption for printing the first print image is white, yellow, light blue or pastel color. Information carrier. The colored ink having low visible light absorption 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 colored 4. The information carrier according to claim 1, 2, or 3, wherein the black component of the ink has a lower color density than the black component of the ink having the glittering material. 5. The true / false discrimination according to claim 1, wherein the third print image is a multi-tone image expressed by a gray scale within an area ratio of 0 to 100%. Information carrier. 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 5. The information carrier according to claim 1, 2, 3 or 4, wherein a difference in area ratio between the image area and the background portion is 75% or more. At least a part of one or more of the first print image, the second print image, and / or the third print image is halftone dot size large and small, line shape thick and dense, wavy shape 7. The information carrier capable of authenticating authenticity according to claim 1, wherein the information carrier is formed by any one of thick and sparse and dense, and broken line thick and sparse and dense. 8. The information carrier according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the transparent ink for printing the third print image further contains a fluorescent material. 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. The information carrier according to 3, 4, 5, 6 or 7, which can determine authenticity.

Images