JP5958816B2 - Print for authenticity determination - Google Patents

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matters that require anti-counterfeiting effects, the present invention and transmitted light This is related to the printed matter for authenticity determination in which the image changes when observed below.

  Recent advances in digital devices such as scanners, printers, and color copiers have made it possible to easily produce elaborate copies of precious printed matter. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeit technologies that cannot be reproduced by a printer or a copier are required.

  As one of the anti-counterfeiting techniques, there is a so-called watermark in which a pattern is formed according to the density or thinness of a sheet and visually recognized under transmitted light. This watermark is a technology that can determine authenticity in any environment as long as a certain amount of light is present, and it is also a classic technology that has existed for a long time because it is well known. Nevertheless, it is still used on banknotes around the world.

  However, since this technology needs to be formed at the paper manufacturing stage, it cannot be manufactured unless it is a paper manufacturer, and in addition, even when manufactured by a paper manufacturer, there is a problem that the manufacturing cost increases. As a method of reproducing this in a pseudo manner, there is an anti-counterfeiting technique for forming a transmission image corresponding to this watermark using a special penetrating ink (for example, see Patent Document 1) in a printing process (for example, a patent). Reference 2).

JP 2000-290571 A JP-A-6-228900

  However, with regard to the anti-counterfeiting technology for forming a watermark image as described in Patent Document 2 by simply using the penetrating ink as in the technique of Patent Document 1, the penetrating ink itself has already been marketed by many manufacturers. Therefore, even for the general public, it is easily available, so there is a problem that it is easy for a counterfeiter to manufacture.

  In addition, as in the technique described in Patent Document 2, a large amount of penetrating ink is used as a base material in order to form a penetrating image having a contrast that can be easily viewed under transmitted light using penetrating ink. For offset printing, which is a common and most productive commercial printing method, the amount of ink transfer is insufficient and a transparent image with high visibility like an original watermark is required. Special ingenuity and advanced printing skills were essential.

  The present invention is intended to solve the above-described problems, and is a printed image formed using a colored penetrating ink prepared by mixing a coloring material with penetrating ink, and under reflected light. Although significant information of the first image can be visually recognized, it relates to a printed matter for authenticity determination, which is characterized in that the significant information of the first image becomes invisible under transmitted light. Further, the image is formed by printing the first image with colored penetrating ink on one side of the substrate and the second image with low light-transmitting ink on the other side of the substrate. Under the reflected light, significant information of the first image formed with the colored penetrating ink is observed, and under the transmitted light, the first image disappears and the second image printed with the ink having low light transmittance It relates to a printed matter for authenticity determination, characterized in that second significant information can be observed.

The printed matter for authenticity determination in the present invention has a printing region at the same position on the front and back of at least a part of the substrate having light permeability and permeability, and the printing region on one side of the substrate is the substrate and Comprising a first image composed of first inks of different colors;
The first ink consists of a colored penetrating ink containing a colored coloring material and a penetrating component,
The first image includes an information part indicating at least the first significant information, and the difference between the maximum reflection density of the information part and the reflection density of the substrate is 0.1 or less,
When observed with reflected light from one surface of the substrate, the first significant information can be visually recognized, and when observed with transmitted light from one surface of the substrate, the first significant information is lost. It is characterized by.

The printed matter for authenticity determination in the present invention has a printing region at the same position on the front and back of at least a part of the substrate having light permeability and permeability, and the printing region on one side of the substrate is the substrate and Comprising a first image composed of first inks of different colors;
The first ink consists of a colored penetrating ink containing a colored coloring material and a penetrating component,
The first image includes an information part indicating the first significant information and an information part composed of the first ink in addition to the information part and a peripheral part having a different density, and the maximum reflection density and the minimum reflection of the first image. The difference from the concentration is 0.2 or less,
When observed with reflected light from one surface of the substrate, the first significant information can be visually recognized, and when observed with transmitted light from one surface of the substrate, the first significant information is lost. It is characterized by.

The printed matter for authenticity determination in the present invention includes a second image showing second significant information composed of a second ink having light blocking properties in a printing region on the other surface of the substrate,
When observed with reflected light from one surface of the substrate, the first significant information can be visually recognized, and when observed with transmitted light from one surface of the substrate, the first significant information disappears, The second significant information having the light blocking property can visually recognize the second significant information by blocking the light.

  The colored coloring material in the colored penetrating ink of the printed matter for authenticity discrimination according to the present invention is a colored pigment and / or a colored dye, and the blending ratio in the colored penetrating ink is 10% or less.

  The second ink of the printed matter for authenticity determination according to the present invention includes a metal pigment having a high light blocking property.

  The second image of the printed matter for authenticity determination according to the present invention is characterized by comprising a dot area ratio of 20% or more.

  The second image of the printed matter for authenticity determination according to the present invention is characterized by being transparent or the same color as the base material.

  The printed matter for authenticity determination in the present invention is a colored penetrating ink that is the same color as the second ink and is the same as or different from the first ink in order to camouflage the second image in the print area on the other side. An image obtained by reversing the density of the second image with the third ink is formed by hair removal.

  In the printed matter for authenticity determination of the present invention, it is confirmed that the first significant information is visible when the printed material is observed under reflected light, and the first significant information is invisible when observed under transmitted light. By doing so, it is possible to determine authenticity, no special light source or filter is required, and no special tool is required.

  The printed matter for authenticity determination of the present invention cannot be formed by simply printing a commercially available penetrating ink. In forming this, the penetrating component and the colorant are mixed at an appropriate blending ratio, and reflected. It is necessary to produce a colored penetrating ink that has optical properties that are visible under light but are invisible under transmitted light or that change to a very pale color that is difficult to see. Therefore, it is impossible to forge using a commercially available ink.

  The printed matter for authenticity determination of the present invention does not perform authenticity determination by directly visualizing a transmission image formed with a penetrating ink as in the conventional watermark printing technique, but is a colored penetrating ink containing a penetrating component. Thus, the authenticity determination is performed by erasing a specific image under transmitted light. For this reason, the transmittance of the printed part printed with colored penetrating ink does not need to greatly exceed the transmittance of the non-printed part as in the prior art, and it is sufficient if the transmittance reaches the same level as the non-printed part. Demonstrate. Therefore, unlike the conventional watermark technique, it is not necessary to transfer a large amount of penetrating ink in order to increase the visibility of a latent image, and a sufficient effect can be obtained even with a small ink transfer amount.

  In one form of the printed matter for authenticity determination of the present invention, the second significant information is the first significant information that can be visually recognized under reflected light and is not correlated with the first significant information under transmitted light. Can be visually recognized, and a so-called image change effect can be produced. Since this form has a large impact on the observer and is more difficult to imitate, it is more excellent in authenticity discrimination and excellent in anti-counterfeiting effect.

  Further, in one embodiment of the present invention for generating the change effect of the authenticity determination printed matter, the two inks do not have to be the same color, and the positional relationship between the first image and the second image is arbitrarily set. It only needs to be arranged in the print area. Therefore, there is no need for color matching between the two inks, severe positioning during printing, color management, and the like, and the manufacturer can produce a printed matter for authenticity determination that exhibits a stable effect relatively easily.

  The printed material for authenticity determination formed by the above method is excellent in cost performance because it can be manufactured by offset printing, which is a highly productive printing method, and the effect is not reproduced even if the latest digital equipment is used. Since it is possible, it has an excellent anti-counterfeit effect.

The printed matter for authenticity determination of this invention is shown. An example of the 1st image of the printed matter for authenticity determination of this invention is shown. The effect of the printed matter for authenticity determination of the present invention will be shown. The effect of the printed matter for authenticity determination of the present invention will be shown. The effect of the printed matter for authenticity determination of the present invention will be shown. The printed matter for authenticity determination of this invention is shown. The 1st image and the 2nd image in the printed matter for authenticity determination of this invention are shown. The method for forming a printed matter for authenticity determination according to the present invention will be described. The actual print image of the 2nd image in the printed matter for authenticity determination of this invention is shown. The effect of the printed matter for authenticity determination of the present invention will be shown. 1 shows a configuration for camouflaging a second image in a printed matter for authenticity determination of the present invention. 1 shows a configuration for camouflaging a second image in a printed matter for authenticity determination of the present invention. 1 shows a printed matter for authenticity determination in one embodiment of the present invention. The effect of the printed matter for authenticity determination in one Example of this invention is shown. 1 shows a printed matter for authenticity determination in one embodiment of the present invention. The 1st image and 2nd image of the printed matter for authenticity determination in one Example of this invention are shown. The effect of the printed matter for authenticity determination in one Example of this invention is shown. 1 shows a printed matter for authenticity determination in one embodiment of the present invention. The 1st image and 2nd image of the printed matter for authenticity determination in one Example of this invention are shown. The effect of the printed matter for authenticity determination in one Example of this invention is shown. 1 shows a printed matter for authenticity determination in one embodiment of the present invention. The 1st image and 2nd image of the printed matter for authenticity determination in one Example of this invention are shown. The effect of the printed matter for authenticity determination in one Example of this invention is shown.

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.
(Embodiment 1)

  The printed matter for authenticity determination (1) described in the first embodiment has an effect that the first significant information can be visually recognized under diffuse reflected light, but the first significant information becomes invisible under transmitted light. FIG. 1 shows a printed matter (1) for authenticity determination in the present invention. The printed matter for authenticity discrimination (1) has a color different from the base material on one side of the base material (2) having permeability, and the first image (3) representing the first significant information is Formed. There are no particular restrictions on the size of the first image (3). In the description of the present embodiment, the first significant information represented by the first image (3) indicates the letter “A” of the alphabet.

  The base material (2) constituting the printed matter for authenticity discrimination (1) in the present invention is penetrating into the base material (2) when penetrating ink is printed, such as fine paper or coated paper. It is necessary that the base material (2) itself has a light transmission property that transmits light. With an opaque plastic or metal, the effect of making the first significant information invisible under the transmitted light of the present invention cannot be obtained.

  The configuration of the first image (3) will be described with reference to FIG. The first image (3) needs to be formed with colored penetrating ink. Colored penetrating ink is formed by slightly mixing a coloring material with penetrating ink containing penetrating components that have the effect of allowing the printed image to show through under transmitted light (observed brighter than the non-printed area). It is an ink and refers to a penetrating ink having a light color.

  The colored penetrating ink will be specifically described below. Colored penetrating inks, when printed on a substrate, can form an image with a clearly visible color under reflected light, while the image is invisible or a light color that is almost invisible under transmitted light. It has a characteristic that changes. In short, it is an ink having the effect of “the image disappears when see-through”. In the present specification, “light color” refers to a color having high brightness under diffuse reflected light, and specifically, when colored penetrating ink is printed with a solid of a dot area ratio of 100%. Has a value of more than 70 in L * under diffuse reflected light.

  In the prior art, the above-described penetrating ink is recognized as an ink that forms a so-called watermark when it sees an image when it is seen through, and generally forms a transparent image that appears directly and brighter than the non-printed portion. It was the target. However, in order to obtain a watermark effect with sufficient visibility, it is necessary to transfer a large amount of penetrating ink, and depending on the printing method, there is a problem that a sufficient watermark effect cannot be obtained.

  The colored penetrating ink used for forming the printed matter for authenticity discrimination of the present invention includes a penetrating component and a coloring material, and the penetrating component has a transmittance generated by suppressing light scattering inside the substrate. The balance between the increase and the decrease in transmittance caused by the absorption of light by the colorant has the characteristic that the color changes very lightly in observation under transmitted light, which was not found in previous penetrating inks. Creates the effect of “the image disappears when see-through”.

  For this reason, even if the effect of the penetrating component “appears when it shows through” is low, by adjusting the mixing amount of the coloring material to an amount according to the performance of the penetrating component, a large amount of ink can be transferred due to restrictions imposed by the printing method. Even in the case where there is not, an effect of “the image disappears when it is seen through” can be newly produced.

  The penetrating component in the colored penetrating ink may be the same as the penetrating component of the conventional penetrating ink, and may be prepared by mixing a commercially available penetrating ink and a coloring material.

  The higher the performance of the penetrating component of the colored penetrating ink (the higher the effect of increasing the transmittance in the printing area), the greater the amount of colorant mixed, so the color density of the colored penetrating ink can be increased. Therefore, an image with higher visibility can be formed in observation under diffuse reflection light.

  Conversely, if the performance of the penetrating component of the colored penetrating ink is low (the effect of increasing the transmittance of the printing area is low), it is necessary to reduce the color density of the colored penetrating ink by reducing the mixing amount of the coloring material. In this case, the visibility of the image under diffuse reflected light is low.

  However, in any case, if the penetrating component has a performance equivalent to that of ink that is generally sold as a watermark ink, a certain amount of coloring material is mixed and the image disappears when it is seen through. It is possible to obtain a colored penetrating ink having an effect, and an image printed using the colored penetrating ink can be easily visually recognized under diffuse reflected light.

  As the color material to be mixed with the colored penetrating ink, a printing color material sold as a color pigment or a color dye may be used. For the purpose of distributing to the market as printed matter, it is desirable to use a color pigment that is easy to obtain long-term fastness.

  In addition, the colored penetrating ink used in the present invention must have a light color, and in order to stably produce a light color ink with high reproducibility, a pigment called a transparent pigment or a fine particle pigment should be selected. Is desirable.

  These pigments are most suitable as a coloring material used in the colored penetrating ink because they have high permeability and low coloring power compared to general pigments. As such transparent pigments and fine particle pigments, there are cobalt pigments and cyanine pigments, and they have a large number of colors and are generally sold as color materials for printing.

  When the colored penetrating ink is produced using the printing color material as described above, the mixing amount of the printing color material in the ink is preferably 10% or less by weight. The effect of “the image disappears when see-through” is not only dependent on the performance of the colored penetrating ink, but is also greatly influenced by the reflection density of the image to be formed.

  For example, the same colored penetrating ink was used when a so-called solid image with a halftone dot area ratio of 100% was formed and when a light image was formed with a halftone dot area ratio having a low highlight from halftone. However, the effect of “the image disappears when see-through” is higher in the latter image (however, the visibility of the former image is higher under diffuse reflection).

  From this, it is necessary to determine the appropriate amount of the color material to be mixed with the colored penetrating ink depending on the coloring power of the color material itself, the performance of the penetrating component, the shade of the image to be formed, etc. In a colored penetrating ink containing 10% or more, whatever method is used, it is difficult to obtain a high level of “image disappears when see-through”, and should be avoided. In order to obtain the “image disappears when see-through” effect, it is necessary to provide an appropriate reflection density limit for the first image (3) formed with the colored penetrating ink. This will be described later.

  The penetrating component in the present invention refers to a component that works to increase the transmittance of the printing region by penetrating into the paper during printing, and specifically, is close to the refractive index of cellulose (1.49). It refers to resin, wax, animal and vegetable oils. These components fill the gaps between the cellulose fibers present in the paper when printed, and serve to increase light transmittance mainly by suppressing light scattering inside the paper.

  The penetrating ink in the present invention refers to an ink that contains the penetrating component described above and is generally sold as a watermark ink. Examples of such ink include T & K TOKA's best one watermark ink, Teikoku ink Unimark, Toyo Ink SMX watermark ink, Joint ink E2 varnish, and the like. Even when a low-viscosity ink such as gloss varnish generally sold as OP varnish is used, a certain penetrating effect can be expected. Therefore, a colored penetrating ink can also be produced using a transparent low-viscosity ink.

  The color penetrating ink printing method exhibits a sufficient effect in offset printing, but may be formed by flexographic printing, gravure printing, intaglio printing, screen printing, or the like according to the manufacturer's seeds.

  In addition, fluorescent pigments, fluorescent dyes, phosphorescents are used for the purpose of determining the occurrence of reprinting and printing defects in colored penetrating inks and inks with low light transmittance, or for the purpose of improving authenticity discrimination. There is no problem even if functional materials such as luminescent pigments and luminescent dyes such as pigments, infrared absorbing materials and infrared reflecting materials are added. The above is the description of the colored penetrating ink essential to the present invention.

  Next, a description will be given of the density limitation, that is, the reflection density limitation necessary for forming the first image (3). The first image (3) formed using the colored penetrating ink needs to be configured within the range of an appropriate reflection density. In the case of a configuration that does not limit the reflection density, for example, a configuration that has a very large gray level difference in which the difference between the maximum reflection density and the minimum reflection density in the first image (3) exceeds 0.5, No matter how excellent the colored penetrating ink is used, the difference in density in the first image (3) becomes too large, so that the effect of erasing the image when watermarking cannot be obtained. In order to obtain the effect that the first significant information seen under the reflected light disappears under the transmitted light, it is necessary to provide an appropriate restriction on the reflection density of the first image (3).

  The limitation on the reflection density of the first image (3) is roughly classified into two types depending on the configuration of the first image (3). First, one type is the light and shade surrounding it in addition to the information part (3a, 3a ′) indicating the first significant information, as in the examples shown in FIGS. 2 (a) and 2 (b). This is the case of the configuration of the first image (3) provided with different peripheral portions (3b, 3b ′). Note that the peripheral portions (3b, 3b ′) in this example do not have to have a configuration that completely surrounds the information portions (3a, 3a ′) as in the example of FIG. A configuration may be adopted in which a part of the contour of the information section (3a, 3a ′) is in contact with a certain section, as in the example. Specifically, the peripheral part (3b, 3b ′) is in contact with the information part (3a, 3a ′), so that the information that can be read from the contour of the first image (3, 3 ′) is changed. It is sufficient that the first significant information cannot be read when only the contour of the image (3, 3 ′) is observed. This is necessary to eliminate the contrast between the information portion and the peripheral portion and to make the first significant information invisible when the first image (3, 3 ′) is observed under transmitted light. This is a configuration.

  In the case of the above-described configuration, the peripheral portions (3b, 3b ′) are formed of the colored penetrating ink constituting the information portion (3a, 3a ′). Thus, the first image (3, 3 ′) has the information part (3a, 3a ′) and the peripheral part (3b, 3b ′), and the information part (3a, 3a ′) and the peripheral part (3b, 3b ′), when the first significant information of the information part (3a, 3a ′) is visualized by the difference in light and shade, the maximum reflection density and the minimum reflection density in the first image (3, 3 ′) It is necessary to provide a restriction that keeps the difference of 0.2 or less. When this restriction is applied, the first significant information like the first image (3) shown in FIG. 2 (a) is a simple binary image, and the information part (3a) is relatively dark, When the peripheral part (3b) has a relatively light configuration, if the reflection density of the information part (3a) is 0.3, the reflection density of the peripheral part (3b) needs to be 0.1 or more. There is. Also, for example, as in the first image (3) shown in FIG. 2B, the first significant information is the face of the person, and the shades of the information part (3a) and the peripheral part (3b) are different. In the case of a complicated configuration, if the reflection density of the highest density part (the clothes part as an image) is 0.6 in the whole image, the lowest density part (as an image) The reflection density of the nose of the face) needs to be 0.4 or more.

  As shown in the example shown in FIG. 2C, the first significant information is classified only into the information part (3a ″), which is classified into another type of restriction of the reflection density of the first image (3). The peripheral portion (3b ″) that surrounds and surrounds the base material (2). That is, this is a case where the peripheral portion (3b ″) is not composed of the colored penetrating ink. In the case of such a configuration, the difference between the maximum reflection density in the information part (3a ″) of the first image (3 ″) and the reflection density in the peripheral part (3b ″) is calculated as described above. It should be 0.1 or less, which is half of the type.

  The reason why the limitation of the reflection density of the first image (3, 3 ′) is largely classified into two types depending on the configuration of the first image (3, 3 ′, 3 ″) will be described. When the first image (3, 3 ′) is composed of the information part (3a, 3a ′) and the peripheral part (3b, 3b ′) as shown in FIG. The information portions (3a, 3a ′) representing the significant information have different shades but have the same hue and are in contact with the peripheral portions (3b, 3b ′) formed of the same colored penetrating ink. In order to make the first significant information invisible at the time of transmission, the color of the information part (3a, 3a ′) representing the first significant information and the color of the peripheral part (3b, 3b ′) become the same color at the time of transmission. The first image (3, 3 ') where the information part (3a, 3a') and the peripheral part (3b, 3b ') are made of colored penetrating ink is necessary. Since the hues of the portions (3b, 3b ′) are the same, the colors at the time of transmission of the two portions are the same as long as the shades are converged. In such a configuration, since the density of the entire image changes lightly due to the effect of the colored penetrating ink, even if the reflection density difference is designed to be relatively large, the first significant information is lost under transmitted light. Can do.

  On the other hand, when the first image (3 ″) is composed only of the information portion (3a ″), the peripheral portion (3b ″) in contact with the information portion (3a ″) is not composed of colored penetrating ink. The hues of the part (3a ″) and the peripheral part (3b ″) are different, and only the information part (3a ″) changes in density lightly. Therefore, in order for the first significant information to become invisible when observed with transmitted light, it is not sufficient that the density inside the first image (3 ″) changes lightly, and there is a difference in hue. The first image itself needs to be in an almost invisible state, which changes so pale that it cannot be recognized. In order to obtain such an effect, it is necessary to design the first image (3 ″) by limiting it to a light reflection density in advance. The above is the reason why the reflection density limit differs depending on the configuration of the first image (3).

  As described above, when the first image (3) is composed of the information portion (3a, 3a ′) and the peripheral portion (3b, 3b ′), the maximum reflection density and the minimum in the first image (3). In the case where the difference in reflection density is 0.2 or less and only the information part (3a ″) is included, the difference between the maximum reflection density in the first image (3) and the reflection density of the substrate is 0.1 or less. It is necessary to. The reflection density in this specification refers to the ratio of reflected light to incident light generally used in the field of printing, and is the highest value among the CYMK color components of the reflection density measured using a reflection densitometer. It refers to the reflection density of a high color component. The reflection densitometer is a measuring device sold by Gretag Macbeth or X-rite to manage the reflection density of printed matter, and is a general device in the field of printing.

  As described above, the first image (3) can take various forms depending on the configuration desired by the user as long as it is within a certain gradation expression range.

  FIG. 3 shows the effect of the printed matter (1) for authenticity determination of the present invention formed with the above configuration. The light source (4) and the observer's viewpoint (5a) with respect to the authenticity printed matter (1) are in a positional relationship as shown in FIG. ), The letter “A” of the alphabet, which is the first significant information represented by the first image (3), can be visually recognized.

  The light source (4) and the observer's viewpoint (5b) with respect to the printed matter for authenticity discrimination (1) are in a positional relationship as shown in FIG. In 5b), the first significant information in the first image (3) becomes invisible.

  Next, the effect of the authenticity determination printed matter (1 ′) shown in FIG. 2B will be described with reference to FIG. When the printed matter for authenticity determination (1 ′) is observed under the diffuse reflected light shown in FIG. 4A, the observer (5a ′) has the first significant information represented by the first image (3 ′). A person's face can be visually recognized.

  Further, when the light source (4 ′) and the observer's viewpoint (5b ′) for the printed matter for authenticity determination (1 ′) are observed under the transmitted light shown in FIG. 4B, the observer (5b ′) The first significant information in the first image (3 ″) becomes invisible.

  Finally, FIG. 5 explains the effect of the authenticity determination printed matter (1 ″) shown in FIG. When the printed matter for authenticity determination (1 ″) is observed under the diffuse reflected light shown in FIG. 5A, the first image (3 ″) represents the first image (3 ″) to the observer (5a ″). The letter “A” of the alphabet, which is significant information, can be visually recognized.

  Further, when the light source (4 ″) and the observer's viewpoint (5b ″) for the printed matter for authenticity determination (1 ″) are observed under the transmitted light shown in FIG. 5B, the observer (5b) ″), The first significant information in the first image (3 ″) is invisible.

  As described above, a description will be given of the principle that the first significant information that can be visually recognized under diffuse reflected light becomes invisible during observation under transmitted light. First, in observation under diffuse reflected light, the first image (3) has a difference in lightness between the information part (3a) and the peripheral part (3b), or the base material (2) has a different color. The observer can visually recognize the first significant information based on the difference in shade in the first image (3) or the difference in color from the base material (2).

  On the other hand, in the observation under transmitted light, since the color of the first image (3, 3 ′) formed with the colored penetrating ink changes lightly, the density difference of the entire image is visually compressed. Therefore, the information part (3a, 3a ′) representing the first significant information having a certain shading in the first image (3, 3 ′) is distinguished from the peripheral part (3b, 3b ′). It becomes impossible to make it invisible. In the example of the first image (3 ″) in which the peripheral portion (3b ″) shown in FIG. 2 is not composed of the colored penetrating ink, the density of the first image (3 ″) is higher than that of the other examples. Although it is necessary to design lightly, as long as the difference in reflection density from the base material (2 ″) is kept to 0.1 or less, the first image (3 ″) has a relatively light shade, so transmission Under the light, the hue itself cannot be grasped, the difference between the base material (2 ″) and the first image (3 ″) cannot be recognized, and the first image (3 ″) itself is visually lost. The effect which can be obtained can be acquired.

  Based on the above principle, the first significant information that can be visually recognized in the observation under the diffuse reflected light becomes visually invisible in the observation under the transmitted light. In the present invention, “observation under diffuse reflected light” means that the viewpoint (5a) of the observer is in an area where there is almost no specularly reflected light and the printed matter for authenticity determination (1) is observed. In the present invention, “observation under transmitted light” means that the observer's viewpoint (5b) is in the area under transmitted light and the printed material for authenticity determination (1) is observed. Shows the situation.

  Next, another embodiment of the present invention will be described. In the form described below, the first significant information that was visible in the observation under the diffuse reflected light is not only visually invisible in the observation under the transmitted light, but also in the observation under the transmitted light. It has a so-called image change effect in which second significant information different from significant information appears and can be visually recognized.

(Embodiment 2)
FIG. 6 shows a printed matter for authenticity determination (1 ′ ″) according to the present invention. The printed matter for authenticity determination (1 ″ ″) includes a printing region (6 ″ ″) in the substrate (2 ″ ″). The printing region (6 ″ ″) of the present invention does not exist only on one side surface of the base material (2 ″ ″), but in the base material (2 ″ ″) of the region and at a directly facing position. It exists on both surfaces of a base material (2 '''). There is no particular restriction on the range of the print area (6 ""), and the first image (3 ""), the substrate (2 "") and the second image (7 "") As long as it is included. For convenience of explanation, the characters “A” and “B” can be visually recognized in the printed matter for authenticity discrimination (1 ″ ″) in FIG. 6, but actually one of the base materials (2 ″ ″). The letter “B” is invisible when observed under diffuse reflection from the surface. The printed material for authenticity discrimination (1 "") has a first image (3 "") formed on the printing area (6 "") on one side of the substrate (2 ""). A second image (7 ′ ″) is formed in the print area (6 ″ ″) on the other surface of the material (2 ″ ″). The first image (3 ′ ″) and the second image (7 ′ ″) must not be formed on the same surface. Hereinafter, in the specification, the surface on which the first image (3 ′ ″) is formed is defined as one surface, and the surface on which the second image (7 ′ ″) is formed is defined as the other surface. To do.

  FIG. 7A shows a first image (3 ′ ″). The configuration of the first image (3 ′ ″) needs to be the same as that described in the first embodiment. In other words, the first image (3 ′ ″) is a color different from that of the base material, represents the first significant information, needs to be formed with the colored penetrating ink, and is within an appropriate shade range. Need to form. Further, the first significant information in the present embodiment is the letter “A” of the alphabet.

  FIG. 7B shows a second image (7 ′ ″). The second image (7 ′ ″) represents the second significant information. The second significant information in the present embodiment is the letter “B” of the alphabet. The second image (7 ′ ″) needs to be formed with ink having low light transmittance. The color is not particularly limited, but if the user requests the characteristic that the second image (7 ′ ″) is invisible when observed with reflected light from the other surface, it is transparent or the substrate (2) It is necessary to form with the same color ink. The configuration when it is desired to form the second image (7 ′ ″) with other colors will be described later.

  Colors that are the same color as the base material (2 '' ') are the same when the observer glances at the two observation objects that have colors without paying special attention to the two observation objects that are not different colors. It is assumed that the color is felt. For example, the color difference ΔE is set to a value of 5 or less. Further, in this specification, “low light transmission” refers to a feature in which a ratio of transmitting light is low when observed under transmitted light and looks relatively dark compared to a non-printed portion. Specifically, it is assumed that the transmittance of visible light from 400 nm to 700 nm is 10% or more lower than the portion where the substrate (2 ′ ″) where nothing is printed is exposed.

  In order to reduce such light transmittance, it is easiest to add a metal pigment having a high light blocking property to the ink constituting the second image (7 ′ ″). A transparent or white pigment may be blended as the metal pigment having low light transmittance and high light blocking properties. As such pigments, for example, metal pigments such as titanium and aluminum, and functional pigments of silica are suitable.

  FIG. 8 shows a method for forming a printed matter for authenticity determination (1 ′ ″) according to the present invention. The first image (3 "") is formed on one surface of the printing area (6 "") with respect to the printing area (6 "") of the substrate (2 ""). By forming the second image (7 ′ ″) on the other surface of (6 ″ ″), the authenticity printed matter (1 ″ ″) of the present invention can be obtained.

  Note that when the second image (7 ′ ″) is formed on the other surface, the actual image to be printed is the second image (7 ′ ″) mirror-inverted as shown in FIG. The second image (7M ′ ″) is required. This is because when the print area (6 '' ') is observed from one surface with transmitted light, the image formed on the other surface is always observed in a mirror-inverted state.

  FIG. 10 shows the effect of the printed matter for authenticity determination (1 ′ ″) of the present invention formed with the above configuration. In the observation under the diffuse reflected light as shown in FIG. 10A, the light source (4 ′ ″) and the observer's viewpoint (5a ″) for the printed matter for authenticity determination (1 ″ ″) When observed from one surface side, the alphabet (A) of the alphabet which is the first significant information represented by the first image (3 ′ ″) can be visually recognized by the observer (5a ″).

  Further, the light source (4 "") and the observer's viewpoint (5b "") for the printed matter for authenticity determination (1 "") are observed under transmitted light as shown in FIG. When observed from one surface side, the observer (5b ″) can visually recognize the letter “B” of the alphabet, which is the second significant information represented by the second image (7 ″ ″). .

  As described above, a description will be given of the principle by which the visually recognizable images differ between observation under diffuse reflection light and observation under transmitted light. First, in the observation under diffuse reflected light, the second image (7 ′) out of the first image (3 ′ ″) and the second image (7 ′ ″) in the print region (6 ′ ″). ″ ″ ′) Is formed on the other surface and is invisible from one surface. Therefore, only the first image (3 ′ ″) in the print area (6 ′ ″) can be viewed, and the first significant information can be viewed.

  On the other hand, in the observation under transmitted light, the first image (3 ′ ″) formed with the colored penetrating ink becomes invisible because its color changes faintly, and is formed with one of the low light-transmitting inks. The second image (7 ′ ″) is visible darker than the base material (2 ′ ″). Therefore, only the second significant information is visualized in the observation under transmitted light. Based on the above principle, the image that can be visually recognized in the print area (6 ′ ″) changes from the first significant information to the second significant information in the observation under the diffuse reflected light and the observation under the transmitted light. .

  The configuration of the first image (3 ′ ″) constituting the authenticity determination printed matter (1 ″ ″) of the present invention is the same as the configuration described above. One of the second images (7 ′ ″) is preferably formed with an area ratio of at least 20%. This is because when the area ratio is less than 20%, the visibility of the second significant information appearing under transmitted light is lowered.

  In addition, when the print area (6 ′ ″) is observed from the other surface side under diffuse reflected light, the user thinks that the second image (7 ′ ″) may be shown to the observer. The configuration that should be taken depends on whether the user thinks it is better. If it is better not to show the second image (7 ′ ″) to the observer when the print area (6 ′ ″) is observed from the other surface side under diffuse reflected light, the second The image (7 ″ ″) is preferably formed using a transparent ink or formed with an ink having the same color as that of the base material (2 ″ ″) to make it invisible.

  In addition, if the print area (6 ′ ″) is observed from the other surface side under diffuse reflected light, the second image (7 ′ ″) should not be seen by the observer, and If you want to give a rich color instead of improving the visibility of the second image (7 '' ') in the observation under transmitted light or showing it with simple color shading, 11 and the configuration shown in FIG. 12 can be used.

  The configuration shown in FIG. 11 will be described. The configuration shown in FIG. 11 is an example in which a camouflage image (8 ′ ″ ″) that forms a pair with the second image (7 ′ ″ ″) is formed. The camouflage image (8 ′ ″ ″) is an image having a specific size obtained by inverting the shade of the second image (7 ′ ″ ″) and needs to be formed with colored penetrating ink. In addition, as long as it has the same color as the second image (7 ′ ″ ″), the same or different colored penetrating ink as described above may be used.

  On the other side, the second image (7 ′ ″ ″) and the camouflage image (8 ′ ″ ″) are formed by tapping together to form a fitting image (9 ″ ″) The second image (7 ′ ″ ″) is invisible when observed from the above surface, and can be an image having no shading.

  As shown in FIG. 11, a camouflage image (8 ′ ″ ″) having an area size corresponding to the print area (6 ′ ″ ″) may be formed. As shown in FIG. The camouflage image (8 ′ ″ ″ ″) may be provided over the entire other surface of “′ ″). As a matter of course, the image on the actual printing plate used for printing needs to have a configuration in which the camouflage image (8 ′ ″ ″) is mirror-inverted.

  By using such a configuration for camouflaging the second image (7 ′ ″ ″), the second image (7 ′ ″ ″) is different from the base material while concealing the second image. It becomes possible. For example, when the second image (7 ′ ″ ″) under transmitted light is low in the same color or transparent configuration as the base material, the second image (7 ′ ″ ″) is transmitted with gray light. The camouflage image (8 ′ ″ ″) may be formed with a gray colored penetrating ink. In such a case, in the observation under the reflected light, the second image (7 ′ ″ ″) is not visible when viewed from one surface or the other surface, but the observation is performed under the transmitted light. In FIG. 4, only the camouflage image (8 ′ ″ ″) becomes extremely faint due to the difference in transmittance, while the color of only the second image (7 ′ ″ ″) does not change, and the second image (7 It is possible to visually recognize as an image with higher visibility by reflecting the colored gray color on ″ ″ ″).

  For example, when it is desired to add a red color to the second image (7 ′ ″ ″) under transmitted light, the second image (7 ′ ″ ″) is formed with red ink with low light transmittance. Then, the camouflage image (8 ′ ″ ″) may be formed with red colored penetrating ink. In such a case, in the observation under the reflected light, the second image (7 ′ ″ ″) is not visible when viewed from one surface or the other surface, but the observation is performed under the transmitted light. In FIG. 4, only the camouflage image (8 ′ ″ ″) becomes extremely light due to the difference in transmittance, while the color of only the second image (7 ′ ″ ″) does not change, and as a result, the second image An image rich in color expression in which (7 ′ ″ ″) is colored red can be obtained.

Hereinafter, according to the best mode for carrying out the invention described above, an example of the printed material for authenticity determination specifically produced will be described in detail, but the present invention is not limited to this example. . The first embodiment will be described with reference to FIGS. 13 to 14, the second embodiment will be described with reference to FIGS. 15 to 17, and the third embodiment will be described with reference to FIGS. 18 to 20. Example 4 will be described with reference to FIGS.
Example 1

  Example 1 is an example in which the printed matter for authenticity determination (1-1) is formed on the base material (2-1) using only the first image (3-1).

  FIG. 13 shows the printed matter for authenticity discrimination (1-1) in the present invention. The printed matter for authenticity discrimination (1-1) is formed by forming a first image (3-1) having a light blue color on a base material (2-1). As the base material (2-1), general white high-quality paper (manufactured by Shiraoi Nippon Paper Industries Co., Ltd.) was used.

  The first image (3-1) has a light blue color, the information part (3a-1) representing the letter “A” of the alphabet as the first significant information, and the peripheral part (3b) -1). In this example, the difference between the maximum reflection density and the minimum reflection density of the first image (3-1) was set to 0.1. Specifically, the information part (3a-1) representing the letter “A” of the alphabet, which is the first significant information, is configured with a dot area ratio of 100% and has a reflection density of 0.2, and its peripheral part ( 3b-1) was formed with a halftone dot area ratio of 50% and a reflection density of 0.1.

  The first image (3-1) having the above configuration is formed on the substrate (2-1) by wet offset printing with the light blue colored penetrating ink shown in Table 1, and authenticity determination of the present invention A printed matter (1-1) was obtained.

FIG. 14 shows the effect of the authenticity printed matter (1-1) of the present invention. As shown in FIG. 14A, in the observation under diffuse reflected light, the letter “A” of the alphabet, which is the first significant information represented by the first image (3-1), can be visually recognized in light blue, As shown in FIG. 14B, in the observation under transmitted light, the letter “A” of the alphabet as the first significant information became invisible. As described above, it was possible to obtain the effect that the first significant information observed under the diffuse reflected light becomes invisible in the observation under the transmitted light.
(Example 2)

In the second embodiment, the first image (3-2) and the second image (7-2) are formed in the print region (6-2) of the base material (2-2), and the printed matter for authenticity determination. This is an example in which (1-2) is produced, and the printed matter for authenticity determination (1-2) has an advanced image change effect.

  FIG. 15 shows a printed matter (1-2) for authenticity determination in the present invention. The printed material for authenticity determination (1-2) includes a printing region (6-2) on the base material (2-2), and has a light blue color on one surface of the printing region (6-2). It has one image (3-2) and has a second image (7-2) on the other side of the print area (6-2). As the base material (2-2), a general white fine paper (Shiraoi Nippon Paper Industries) was used in the same manner as in Example 1.

  The first image (3-2) shown in FIG. 16A has a light blue color, and an information part (3a-2) representing the letter “A” of the alphabet as the first significant information And its peripheral part (3b-2). The configuration of the first image (3-2) in this example is exactly the same as that in Example 1, and the difference between the maximum reflection density and the minimum reflection density was set to 0.1. Specifically, the information part (3a-2) representing the letter “A” of the alphabet, which is the first significant information, is configured with a dot area ratio of 100% and a reflection density of 0.2, and its peripheral part ( 3b-2) was configured with a halftone dot area ratio of 50% and a reflection density of 0.1. The first image (3-2) having the above configuration was printed on one surface of the printing region (6-2) by wet offset printing with the light blue colored penetrating ink shown in Table 1.

  Subsequently, the second image (7-2) shown in FIG. 16B was a solid with a dot area ratio of 100%, and was formed in white that has the same color as the base material. The image to be printed is a mirror-inverted image of the second image (7-2). Wet white ink (best one GIGA white M-SOYA T & K TOKA) containing a lot of titanium is used as printing ink. Printing was performed on the other surface of the printing region (6-2) by offset printing to obtain a printed matter (1-2) for authenticity determination of the present invention.

FIG. 17 shows the effect of the printed material for authenticity determination (1-2) of the present invention. As shown in FIG. 17 (a), in observation under diffuse reflected light, the letter “A” of the alphabet, which is the first significant information represented by the first image (3-2), can be visually recognized in light blue, As shown in FIG. 17B, in observation under transmitted light, the letter “A” of the alphabet, which is the first significant information, becomes invisible, and the second significant (2-2) represents the second significant The letter “B” of information, which is information, was visible in dark gray. As described above, it was possible to obtain an effect of changing to different images in observation under diffuse reflected light and observation under transmitted light.
Example 3

  In the third embodiment, the first image (3-3) and the second image (7-3) are formed in the printing region (6-3) of the base material (2-3) to determine the authenticity determination printed matter. (1-3) is an example in which both the first image (3-3) and the second image (7-3) are multi-tone images having rich tones, This is an example in which the false discrimination printed matter (1-3) has an advanced image change effect.

  FIG. 18 shows a printed matter for authenticity determination (1-3) in the present invention. The printed material for authenticity determination (1-3) includes a printing region (6-3) on the base material (2-3), and has a light blue color on one surface of the printing region (6-3). It has one image (3-3) and has the second image (7-3) on the other side of the print area (6-3). As the substrate (2-3), a general white fine paper (Shiraoi Nippon Paper Industries) was used as in the previous examples.

  The first image (3-3) shown in FIG. 19 (a) has a light blue color and the information part (3a-3) representing the face of the person as the first significant information, and its surroundings Part (3b-3). The difference between the maximum reflection density and the minimum reflection density of the first image (3-3) in this example was set to 0.15. Specifically, the maximum halftone dot area ratio in the first image (3-3) was 100%, the reflection density was 0.25, the minimum halftone dot area ratio was 50%, and the reflection density was 0.1. The 1st image (3-3) which comprises the above structure was printed on one surface of the printing area | region (6-3) with the light blue colored penetrating ink shown in Table 1 by wet offset printing.

  Subsequently, the second image (7-3) shown in FIG. 19 (b) was configured with 100% gradation expression area, with the second significant information as a habit image. That is, the maximum halftone dot area ratio was 100%, the minimum halftone dot area ratio was 0%, and it was formed of white having the same color as the base material. The image to be printed is a mirror-inverted image of the second image (7-3). As printing ink, white ink containing a large amount of titanium as in Example 2 (Best One GIGA White M-SOYA manufactured by T & K TOKA) ) Was used to perform printing on the other surface of the print region (6-3) by wet offset printing to obtain a printed matter for authenticity determination (1-3) of the present invention.

FIG. 20 shows the effect of the printed material for authenticity determination (1-3) of the present invention. As shown in FIG. 20A, in the observation under diffuse reflected light, the face of the person, which is the first significant information represented by the first image (3-3), can be visually recognized in a light blue color. ), In the observation under transmitted light, the face of the person as the first significant information becomes invisible, and the image of the eyelid as the second significant information represented by the second image (5-2) is dark It was visible in gray. As described above, it was possible to obtain an effect of changing to different images in observation under diffuse reflected light and observation under transmitted light.
Example 4

  In Example 4, the first image (3-4) and the second image (7-4) are formed in the print region (6-4) of the base material (2-4), and the printed matter for authenticity determination. (1-4) is an example in which both the first image (3-4) and the second image (7-4) are multi-tone images having rich tones, and The printed image for authenticity determination (1-4) is characterized in that the second image (7-4) has a brown color under transmitted light.

  FIG. 21 shows a printed matter for authenticity determination (1-4) according to the present invention. The printed matter for authenticity determination (1-4) includes a printing region (6-4) on the base material (2-4), and has a light blue color on one surface of the printing region (6-4). A second image (7-4) with a light brown color and a camouflage image with the same light brown color (7-4) on the other side of the print region (6-4). 8-4). As the substrate (2-4), a general white fine paper (Shiraoi Nippon Paper Industries) was used as in the previous examples.

  The first image (3-4) shown in FIG. 22 (a) has a light blue color, the information part (3a-4) representing the face of the person as the first significant information, and its surroundings Part (3b-4). In this example, as in Example 2, the difference between the maximum reflection density and the minimum reflection density of the first image (3-4) was set to 0.15. Specifically, the maximum dot area ratio in the first image (3-4) is 100%, the reflection density is 0.25, the minimum dot area ratio is 50%, and the reflection density is 0.1. . The first image (3-4) having the above-described configuration was printed on one surface of the printing region (6-4) by wet offset printing with the light blue colored penetrating ink shown in Table 1.

  Subsequently, the second image (7-4) shown in FIG. 22B is composed of the second significant information as a wrinkle image and a gradation expression area of 100%. That is, the maximum halftone dot area ratio was 100%, and the minimum halftone dot area ratio was 0%. The image to be printed is a mirror-inverted image of the second image (7-4). As printing ink, white ink containing a large amount of titanium as in Example 3 (Best One manufactured by GIGA White M-SOYA T & K TOKA) ) Was mixed with a trace amount of a brown color pigment and printed on the other surface of the printing region (6-4) by wet offset printing. Further, the camouflage image (8-4) shown in FIG. 22 (c) is removed by using the brown colored penetrating ink shown in Table 1 so that the position completely overlaps with the second image (7-4). Printing was performed to obtain a printed matter for authenticity determination (1-4) of the present invention. The image to be actually printed was an image obtained by mirror-inverting the camouflage image (8-4).

  FIG. 23 shows the effect of the authenticity determination printed matter (1-4) of the present invention. As shown in FIG. 23 (a), in observation under diffuse reflected light, the human face, which is the first significant information represented by the first image (3-4), can be visually recognized in light blue, and FIG. ), In the observation under transmitted light, the face of the person as the first significant information becomes invisible, and the image of the eyelid as the second significant information represented by the second image (7-4) is brown Was visible. In addition, when the print region (6-4) is observed from the other surface in the observation under diffuse reflection light, the fitting image (9-4) painted in light brown is visually recognized in the print region (6-4). The second image (7-4) was invisible. As described above, it was possible to obtain an effect of changing to different images in observation under diffuse reflected light and observation under transmitted light.

1, 1 ′, 1 ″, 1 ″ ″, 1-1, 1-2, 1-3, 1-4 authenticity printed matter 2, 2 ″ ″, 2-1, 2-2, 2 -3, 2-4 Substrate 3, 3 ′, 3 ″, 3 ″ ″, 3-1, 3-2, 3-3, 3-4 First image 3a, 3a ′, 3a ″, 3a-1, 3a-2, 3a-3, 3a-4 Information part 3b, 3b ', 3b ", 3b-1, 3b-2, 3b-3, 3b-4 Peripheral part 4, 4', 4 ' ′, 4 ″ ″, 4-1, 4-2, 4-3, 4-4 Light sources 5a, 5a ′, 5a ″, 5a ″, 5a-1, 5a-2, 5a-3, 5a -4, 5b, 5b ', 5b'',5b'', 5b-1, 5b-2, 5b-3, 5b-4, 5c-4
Observer's viewpoint 6 "", 6-2, 6-3, 6-4 Print area 7 "", 7-3, 7-4 Second image 7M "" Mirror inverted second image 8 ″ ″ ″, 8 ″ ″ ″, 8-4 Camouflage image 9 ″ ″ ″, 9 ″ ″ ″, 9-4 Fitted image

Claims (7)

At least a part of the substrate having light permeability and permeability has a printing area at the same position on both sides, and the printing area on one surface of the substrate is a first ink having a color different from that of the substrate. Comprising a first image composed of
The first ink comprises a colored penetrating ink in which a colored color material and a watermark ink are mixed ,
The first image includes an information part indicating first significant information, and a difference between a maximum reflection density of the information part and a reflection density of the base material is 0.1 or less,
When observed with reflected light from one surface of the substrate, the first significant information can be visually recognized, and when observed with transmitted light from one surface of the substrate, the first significant information. Authenticity discrimination printed matter characterized by disappearance of At least a part of the substrate having light permeability and permeability has a printing area at the same position on both sides, and the printing area on one surface of the substrate is a first ink having a color different from that of the substrate. Comprising a first image composed of
The first ink comprises a colored penetrating ink in which a colored color material and a watermark ink are mixed ,
The first image includes an information part indicating first significant information and a peripheral part having a different shade from the information part configured by the first ink in addition to the information part, and the maximum of the first image. The difference between the reflection density and the minimum reflection density is 0.2 or less,
When observed with reflected light from one surface of the substrate, the first significant information can be visually recognized, and when observed with transmitted light from one surface of the substrate, the first significant information. Authenticity discrimination printed matter characterized by disappearance of Comprising a second image showing second significant information composed of a second ink having light blocking properties in the printing region on the other surface of the substrate;
The second ink contains a metal pigment having a high light blocking property,
When observed with reflected light from the one surface of the substrate, the first significant information can be visually recognized, and when observed with transmitted light from the one surface of the substrate, the first 3. The printed material for authenticity determination according to claim 1 or 2, wherein significant information is lost, and the second significant information can be visually recognized by blocking the light by the second ink having the light blocking property. . The colored material in the colored penetrating ink is a transmissive pigment and / or a fine pigment, and the blending ratio in the colored penetrating ink is 10% or less. The printed matter for authenticity determination according to any one of the above items. 4. The printed matter for authenticity determination according to claim 3, wherein the second image has a dot area ratio of 20% or more. The second image is transparent or claim 3 or 5 authenticity discrimination for printed matter, wherein the said a base material and a color matching. In order to camouflage the second image on the print area on the other side, a third ink which is the same color as the second ink and which is the same or different from the first ink. 6. The printed matter for authenticity determination according to claim 3 , wherein an image obtained by reversing the density of the second image is formed by tweezers.

Images