JP6253023B2 - Transmission latent image printed matter - Google Patents

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports that are security printed matter that requires anti-counterfeiting effects, the image changes under reflected light and transmitted light. This is related to the transmission latent image printed matter.

  With recent developments in digital devices such as scanners, printers, and color copiers, it has become 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 printers and copiers are required.

  As one of the anti-counterfeiting techniques, there is a so-called watermarking technique in which a pattern is formed based on the density of fibers and the thickness of paper and is visually recognized under transmitted light. This watermark technology is a technology that can authenticate in any environment as long as there is more than a certain amount of light, and it is also a classic technology that has existed since ancient times because it is well known. Nevertheless, it is still used on banknotes around the world.

  Since the watermark technology needs to be formed at the paper manufacturing stage, it is difficult to manufacture unless it is a paper manufacturer. In addition, even if the paper manufacturer manufactures it, there is a problem that the manufacturing cost becomes high. As a method of reproducing in a pseudo manner, there is a forgery prevention technique in which a transmission image corresponding to this watermark is formed by printing using a special penetrating ink in a printing process (see, for example, Patent Document 1).

  However, with regard to anti-counterfeiting technology using watermark printing that authenticates a transmitted image such as a watermark under transmitted light using penetrating ink, penetrating ink itself is commercially available from many manufacturers. Even if it exists, since it was easily available, there existed a problem that preparation was also easy for a forger.

  In order to solve such a problem, the present applicant has already been able to form a printed image by using two inks having different transmittances as a pair of inks that are observed in the same color under reflected light. An application has been filed for a transmission latent image printed matter that is excellent in authenticity determination and anti-counterfeiting effects, in which the image observed under reflected light and under transmitted light changes (see, for example, Patent Document 2 and Patent Document 3).

  In addition, the present applicant is a printed matter that forms an image with a special and complicated halftone dot configuration, using a pair of inks of a color penetrating ink mixed with a penetrating ink and a colored pigment and a colored penetrating ink as a pair ink, An application has already been filed for a transmission latent image print characterized in that an image observable under reflected light and an image observable under transmitted light are different images that have no correlation at all (for example, see Patent Document 4).

Japanese Patent Laid-Open No. 06-228900 Japanese Patent No. 5230557 Japanese Patent No. 5315580 JP 2012-223905 A

  Each of the techniques described in Patent Document 2 to Patent Document 4 is a technique of forming using the same color pair ink that is the same color under reflected light and looks different color under transmitted light. The pair ink having such characteristics is obtained by using a varnish having a penetrating component in one ink, using a normal type varnish in the other ink, and blending the same amount of the same colored pigment in each varnish. There was a problem that it could be produced simply by adding a small amount of a color pigment and finely adjusting the color.

  Each of the techniques described in Patent Documents 2 to 4 needs to be formed by using a pair of color inks of extremely light density, and the color of the latent image print is limited to a light monotone tone. There was a problem of being scarce. In addition, since the density of the pair ink is extremely light, it is difficult to divert it to other parts than the latent image area. In the production of security prints loaded with latent image prints, since two printing cylinders of the printing press are occupied by such dedicated pair ink, the number of colors that can be used in addition to the latent image is also limited. This was a major limitation in designing the overall color.

  In the technologies of Patent Document 3 and Patent Document 4, when the visibility of a visible image observed under reflected light is configured to be high, the visible image is not disappeared completely under transmitted light and is viewed at the same time as the latent image. Therefore, it was necessary to keep the visibility of a visible image observed under reflected light low.

  The present invention is intended to solve the above-described problems, and it is difficult to counterfeit a pair of inks, has excellent anti-counterfeiting power, and is intended to increase the degree of freedom in design and manufacturing. Printed matter that forms two areas with different lightness and light transmission without being limited to a very light color density, and has high visibility of the image that can be observed under reflected light. The following relates to a transparent latent image printed matter excellent in authenticity determination and anti-counterfeiting effects, characterized by changing to a different image having no correlation.

  The transmission latent image printed matter of the present invention includes a printing region having light transmittance on at least a part of the substrate, and a printing pattern having a color different from that of the substrate composed of a plurality of elements in the printing region. The pattern is the same color as the first image formed by the first chromatic color ink under reflected light, but the color is different because it is at least lighter than the first ink, and the first ink A second image formed by a second ink having a lower light transmittance, and the first image is classified as different information into an information part and a latent image camouflage part by at least the phase of elements being different. The second image is classified as different information into the latent image portion and the information camouflage portion by at least the phase of the elements being different. The latent image camouflage portion and the latent image portion are negative-positive inverted and have a predetermined range. In In the image having a difference in area ratio and formed in the same color under reflected light, the information camouflage part and the information part are formed in the same color under the transmitted light in the image of the negative-positive inverted structure, Under reflected light, the information portion can be visually recognized due to the difference in ink color from the information camouflage portion, and under the transmitted light, the latent image portion can be visually recognized due to the area ratio difference from the latent image camouflage portion. .

  The second ink of the transmission latent image printed matter of the present invention is characterized by containing titanium dioxide.

  Moreover, the printing area | region of the transmission latent-image printed matter of this invention has permeability, and the 1st ink contains the penetration component, It is characterized by the above-mentioned.

  In addition, each element of the transmission latent image printed matter of the present invention is arranged without being superimposed.

  Further, the second ink of the transmission latent image printed matter of the present invention is characterized in that the saturation is higher than that of the first ink.

  The transmission latent image printed matter of the present invention comprises two inks that are different in color under reflected light and change to the same color under transmitted light. This pair ink cannot be produced simply by blending the same amount of the same pigment as the conventional pair ink that is the same color under reflected light and changes to a different color under transmitted light. Specialized knowledge is required. For this reason, compared with the latent image printed matter formed using the conventional pair ink, preparation is difficult and forgery resistance is high.

  The printed pattern of the transmission latent image print of the present invention is different from the printed pattern of the prior art, and the printed pattern is formed by two inks having different colors. For this reason, the color of the printed pattern is not limited to a monotone tone as in the prior art, and can be composed of a plurality of different colors, and the color density does not need to be extremely light. Remarkably colorful expression is possible. In addition, since the paired ink has a reflection density comparable to that of a general colored ink, it can be used for printing areas other than those provided with the print image of the present invention in the security printed matter. Compared to the above, the entire security printed material can be designed with excellent color expression.

  The transparent latent image printed matter of the present invention can completely disappear the visible image under the transmitted light even when the visibility of the visible image observed under the reflected light is high. The visibility of the visible image that is displayed can be increased.

  The transparent latent image printed matter formed by the above method can be manufactured by offset printing, which is a highly productive printing method, so that it has excellent cost performance, and even if the latest digital equipment is used, the transmission image cannot be reproduced. Since it is possible, it has an excellent anti-counterfeit effect. Moreover, since it can authenticate only by seeing through without using a special tool, it is excellent also in discriminability.

The transmission latent image printed matter in this embodiment of this invention is shown. An example of the outline | summary of the structure of the printing pattern in this embodiment is shown. The specific structure of the printing pattern in this embodiment is shown. The specific structure of the 1st image in this embodiment is shown. The concrete structure of the 2nd image in this embodiment is shown. The figure for demonstrating the visual recognition state of the transmission latent image printed matter in this embodiment is shown. The printed pattern in 2nd embodiment of this invention is shown. A specific configuration of the printed pattern in the second embodiment is shown. The transmission latent image printed matter of the Example in this invention is shown. An example of the outline | summary of the structure of the printing pattern of the Example in this invention is shown. The specific structure of the printing pattern of the Example in this invention is shown. The concrete structure of the 1st image of the Example in this invention is shown. The concrete structure of the 2nd image of the Example in this invention is shown. The figure for demonstrating the visual recognition state of the transmission latent-image printed matter of the Example in 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)
FIG. 1 shows a printed latent image (1) in the present invention. The transmission latent image print (1) includes a light-transmitting print region (2A) on at least a part of the substrate (2), and the print region (2A) includes the substrate (2). A printed pattern (3) having two different colors is formed.

  The printing region (2A) in the present invention needs to have a property of transmitting light, that is, so-called light transmittance, such as high-quality paper, coated paper, transparent film, and plastic. With opaque plastic or metal, the effect under transmitted light cannot be obtained. There is no restriction | limiting in particular about the color of a base material (2). Further, the two colors of the printed pattern (3) may be any colors as long as they are different colors from the base material (2).

  FIG. 2 shows an outline of the configuration of the printed pattern (3). The printed pattern (3) is composed of two different colors of ink. These two inks are the first ink and the second ink. The first ink and the second ink are both different colors from the base material other than transparent, and the hue is the same under reflected light, but the lightness and saturation are different, so the colors are different, and in addition, the light transmission is Different. Specific colors and optical characteristics of the first ink and the second ink will be described later.

  The printed pattern (3) shown in FIG. 2 is divided into a first image (4) formed with the first ink and a second image (5) formed with the second ink. The print pattern (3) as a whole is divided into four types of image elements: an information portion (4A), a latent image camouflage portion (4B), a latent image portion (5A), and an information camouflage portion (5B). In the present embodiment, the first image (4) formed with the first ink has an information portion (4A) and a latent image camouflage portion (4B), and the information portion (4A) is visible under reflected light. Represents the first significant information. The first significant information in the present embodiment is the letter “A” of the alphabet. Further, the latent image camouflage part (4B) has a configuration in which the second significant information represented by the latent image part (5A) is inverted, and the second significant information represented by the latent image part (5A) is reflected light. Conceals underneath. The second significant information in the present embodiment is the letter “B” of the alphabet.

  The second image (5) formed with the second ink has a latent image portion (5A) and an information camouflage portion (5B). The latent image portion (5A) represents second significant information visually recognized under transmitted light. The information camouflage part (5B) has a configuration in which the first significant information represented by the information part (4A) is inverted, and conceals the first significant information represented by the information part (4A) under transmitted light. Is made.

  FIG. 3 shows an enlarged part of the image line structure of the printed pattern (3). In the present invention, a fine structure constituting an image element is called a printing element. The printed pattern (3) includes an information element (4a) that is a printing element constituting the information portion (4A), a latent image camouflage element (4b) that is a printing element constituting the latent image camouflage portion (4B), and a latent image. It has a latent image element (5a) which is a printing element constituting the image part (5A) and an information camouflage element (5b) which is a printing element constituting the information camouflage part (5B). Each of the four printing elements is continuously arranged in a specific direction (S1 direction in the figure) at a specific pitch (P1) without overlapping each other, thereby forming a printed pattern (3).

  FIG. 4 shows a specific configuration of the first image (4). In the information part (4A) of the first image (4), the information element (4a) having a specific line width (W1) is continuously arranged in a specific direction (S1 direction in the figure) at a specific pitch (P1). It is arranged, and the letter “A” of the alphabet as the first significant information is represented in a positive state. Further, the latent image camouflage section (4B) of the first image (4) has a specific image line width (W2) of the latent image camouflage element (4b) at a specific pitch (P1) in a specific direction (S1 in the figure). The letters “B” of the alphabet as the second significant information are expressed in a negative state.

  FIG. 5 shows a specific configuration of the second image (5). In the latent image portion (5A) of the second image (5), the latent image element (5a) having a specific image line width (W3) continues in a specific direction (direction S1 in the figure) at a specific pitch (P1). The letter “B” of the alphabet which is the second significant information is expressed in a positive state. Further, the information camouflage section (5B) of the second image (5) has the information camouflage element (5b) having a specific image line width (W4) at a specific pitch (P1) and a specific direction (direction S1 in the figure). The letters “A” of the alphabet as the first significant information are expressed in a negative state. In the present embodiment, the information inversion unit (7) arranged in the same phase with the same line width (W1) and the same pitch (P1) as the information element (4a) inside the information camouflage element (5b). Exists. In the present embodiment, a printed pattern (3) is formed by completely overlapping the information element (4a) as shown in FIG.

  The information part (4A) and the information camouflage part (5B) each represent first significant information, and the relationship between the two images is a relationship in which one image is negative-positive-inverted from the other image. Further, the latent image portion (5A) and the latent image camouflage portion (4B) each represent second significant information, and the relationship between the two images is a relationship in which one image is a negative-positive reversal of the other image. The relationship between each of the two images only needs to be a relationship in which one image is a negative-positive inversion of the other image.

  When the information part (4A) and the information camouflage part (5B) are fitted at a regular position, the first significant information is hidden under transmitted light, and the latent image part (5A) and the latent image When the camouflage portion (4B) is fitted at a regular position, the second significant information is concealed under reflected light.

  As for the information part (4A) and the latent image camouflage part (4B) constituting the first image (4), the elements constituting each part do not overlap each other. Occurs. The information part (4A) is preferably configured with an area ratio of 15% or more and 90% or less. If it is less than 15%, the visibility of the first significant information becomes too low, and if it exceeds 90%, the area allocated to the latent image portion (5A) decreases and the visibility of the second significant information becomes too low. Because. The latent image camouflage portion (4B) is preferably configured with an area ratio of 5% to 30%. If it is less than 5%, the printed image line cannot be expressed stably and the latent image portion (5A) may not be camouflaged. If it exceeds 50%, it is assigned to the information portion (4B). This is because the area decreases and the visibility of the first significant information becomes too low.

  Since the latent image portion (5A) and the information camouflage portion (5B) constituting the second image (5) do not overlap with each other, the respective area ratios are naturally different. Occurs. The latent image portion (5A) is preferably configured with an area ratio of 10% to 50%. If it is less than 10%, the visibility of the second significant information is too low, and if it exceeds 50%, the area allocated to the information part (4A) is reduced and the visibility of the first significant information is too low. It is. Further, since the information camouflage part (5B) needs to have the same or slightly larger area ratio as the information part (4A), it is desirable that the information camouflage part (5B) is configured with an area ratio of 15% to 90%. This is because when the area ratio of the information camouflage element (5b) is smaller than the area ratio of the information element (4a), it is impossible to conceal the information element (4a) with the information camouflage element (5b) under transmitted light. This is because the image change effect which is a feature of the present invention is impaired.

  Further, the latent image element (5a) and the latent image camouflage element (4b) must be of the same color under reflected light, and the second ink constituting the latent image element (5a) is replaced with the latent image camouflage element ( 4b), the image line width (W3) of the latent image element (5a) is set to the image line width (W2) of the latent image camouflage element (4b). ) Must be larger. That is, the ratio of the line width (W3) of the latent image element (5a) and the line width (W2) of the latent image camouflage element (4b) is the reflection density of the first ink and the reflection density of the second ink. It is almost the same as the ratio.

  As for the printing order of the first image (4) and the second image (5), there is no problem either before or after. What is important is that the printing elements constituting the respective image elements are configured so as not to overlap each other. When two or more printing elements overlap, an image that should originally be concealed may be slightly visualized, or the shade of the appearing image may change, and must be avoided. However, in order to ensure the redundancy of printing in the printing work, there is a practical work device that slightly offsets the outline of each image element and provides a slightly overlapping area between the images. It suffices to carry out within a range that has little influence on the appearing image.

  Here, the relationship between the colors of the first ink that forms the first image (4) and the second ink that forms the second image (5) will be described. The first ink and the second ink have different colors from the base material other than transparent, have the same hue, and the first ink is relatively darker than the second ink under reflected light (the lightness is higher). In addition, the first and second inks must be of the same color under transmitted light.

  In addition, the lightness in this specification refers to the brightness of a color, and when it is high, it is bright, and when it is low, it is dark. Saturation refers to the degree of color vividness. In addition, “color” in the present invention represents a color including the concept of hue, saturation, and lightness, and “hue” refers to a color aspect such as red, blue, and yellow. Specifically, the intensity distribution of a specific wavelength in the visible light region (400 to 700 nm) is shown. In the present invention, “the hue is the same” means that the colors of red, blue, and yellow are the same in the two colors, and the wavelength intensity distribution in the visible light region has a correlation in the two colors. .

As described above, the condition that “the lightness of the first ink is low and the lightness of the second ink is high” is an absolute condition that satisfies the relative relationship, but as a specific numerical difference, The lightness L ^* value of the L ^* a ^* b ^* color system of the first ink and the second ink must be different by a lightness difference ΔL = 5 or more, more preferably 10 or more. Is desirable. If ΔL is less than 5, the difference in brightness between the information part (4A) and the information camouflage part (5B) under diffuse reflected light is not sufficient, and the visibility of the first significant information becomes too low, which is not preferable. .

In addition, the colors of the first ink and the second ink are different to the extent that the two areas are not the same color but different colors, just by looking at them without paying special attention. Need to be. Specifically, the color difference ΔE in the L ^* a ^* b ^* color system needs to be different by 6 or more, and it is desirable that the color difference ΔE is 12 or more apart. When ΔE is less than 6, the color difference between the information part (4A) and the information camouflage part (5B) under diffuse reflected light is not sufficient as in the case where the brightness difference described above is insufficient, and the first significant Since the visibility of information becomes too low, it is not preferable.

  Subsequently, the light transmittance of the first ink and the second ink will be described. The light transmittance of the first ink needs to be high, and the light transmittance of the second ink needs to be low. For the high and low standards, it is only necessary that the transparency of the two inks relatively satisfy this relationship. This is an essential characteristic for producing the effect under the transmitted light of the present invention. In order to satisfy this characteristic easily, a high light blocking property may be imparted to the second ink. Specifically, an ink containing a highly light reflective metal pigment such as titanium dioxide, iron oxide, or zinc oxide can be used, or an ink containing silicon dioxide, calcium carbonate, or the like can be used. Or you may implement | achieve high light-shielding property by printing with a thick film thickness using the general ink which does not contain a special metal pigment.

  On the other hand, since the first ink only needs to have higher light transmittance than the second ink, a general coloring pigment or coloring dye may be used. When it is desired to further enhance the effect, there is no problem even if an ink in which a coloring dye or a pigment is mixed with a watermark ink (penetrating ink) is used as in the prior art. Such an ink is called “colored penetrating ink”, which will be described later.

  In the configuration of the present invention, the first ink and the second ink are observed to have different colors under reflected light, but need to change to the same color under transmitted light. The color of each region at the time of transmission changes from the color under reflected light depending on the light transmittance of each region. A region with low light transmittance mainly changes to a dark color due to a decrease in lightness, and a region with high light transmission mainly changes to a light color with an increase in lightness. Therefore, the color under the transmitted light of the first image (4) formed with the first ink having the low lightness of the color under the reflected light has an increased lightness, and the second lightness of the color under the reflected light is high. Since the color of the second image (5) formed with ink decreases in lightness, it is formed with two inks under transmitted light by controlling the color under each reflected light and the respective light transmittance. The colors can be made equal by balancing the colors of the images.

  In addition, not only lightness but also saturation changes under transmitted light. Under transmitted light, the saturation of the first ink increases relatively, while the saturation of the second ink decreases. For this reason, if the saturation of the first ink under reflected light is designed to be low and the saturation of the second ink is designed to be high, it is easy to achieve the same color under transmitted light. Vivid colors have high saturation, and the closer to achromatic colors such as white, gray, and black, the closer the value is to zero. When not only the brightness of the first image (4) and the second image (5) formed by each ink but also the saturation is greatly different, the color expression becomes richer, so the printed pattern (3) Looks better and more preferable. Colors with different lightness can be expressed to some extent by using the same ink, but with different area ratios, but colors with greatly different chromas are difficult to express using only the same ink and using different areas. For this reason, it is difficult to reproduce more, and the forgery resistance is better.

  As described above, when the color design of the two inks is appropriate, for example, when the second ink is an ink containing titanium oxide and the first ink is a normal colored ink, Even when there is a difference of about 10 in the color difference ΔE under reflected light, this difference can be made almost zero under transmitted light. In addition, for example, when a colored penetrating ink, which will be described later, is used for the first ink, even if there is a difference of about 20 in the color difference ΔE under reflected light, this difference should be almost zero under transmitted light. Can do.

  The effect of the transparent latent image print (1) formed with the above configuration will be described with reference to FIG. As shown in FIG. 6 (a), when the transmission latent image print (1) is observed under reflected light, the first ink has a lower lightness and higher density than the second ink. The information part (4A) and the information camouflage part (5B) which are certain images are visually recognized in a state where the information part (4A) formed with the first ink is darker (low brightness), and the first significant information is obtained. It becomes a visualized state. For the latent image portion (5A) and the latent image camouflage portion (4B), which are images in the other pair, the line width (W3) of the latent image element (5a) and the latent image camouflage element (4b) ) Of the image line width (W2) is substantially the same as the ratio of the reflection density of the first ink and the reflection density of the second ink, and therefore the latent image portion (5A) and the latent image camouflage under reflected light. The part (4B) is visually recognized in the same color, and the second significant information is concealed. As described above, since the first significant information is visualized and the second significant information is concealed under reflected light, the printed pattern (3) includes the first significant information as shown in FIG. Only one significant information appears.

  On the other hand, since the first ink and the second ink are visually recognized as the same color under transmitted light, as shown in FIG. 6B, when the transmitted latent image print (1) is observed under transmitted light, The information part (4A) and the information camouflage part (5B) are in the same color, and the first significant information is concealed. For the latent image portion (5A) and the latent image camouflage portion (4B), the ratio of the image line width (W3) of the latent image element (5a) to the image line width (W2) of the latent image camouflage element (4b) is Since the difference in the darkness of the image that is visible as it is, the second significant information formed with a large area ratio is visualized. As described above, since the first significant information is concealed and the first significant information is visualized under transmitted light, the printed pattern (3) includes the first significant information as shown in FIG. Only the second significant information appears.

  As described above, in the transmission latent image printed material (1) of the present invention, the information represented by the printed pattern (3) is the first significant information under reflected light, and the second significant information is visible under transmitted light. Features.

  In the present invention, “observation under reflected light” means that the observer's viewpoint is in an area where there is almost no specular reflection light, and the transmission latent image print (1) is observed under visible light. In the present invention, “observation under transmitted light” refers to a situation in which the observer's viewpoint is in an area under transmitted light and the transparent latent image printed matter (1) is observed. Show.

  The greatest feature of the transmission latent image print (1) of the present invention is that an image is formed using non-isochromatic pair inks having the same hue but different brightness and saturation. The true / false discrimination function that can be discriminated based on changes in the image viewed under reflected light and transmitted light is basically the same as the conventional technology that uses color pair inks. Will not be damaged. On the other hand, when the same color pair ink is not used as in the prior art, the following great advantages are produced in the color design of the printed matter.

  As mentioned in the problem to be solved by the invention, in the conventional latent image printed matter formed by using the same color pair ink, the printed image in which the image is changed cannot be represented by only the change in light and shade, so that the monotone tone is changed. Because it can only be an image of, the color expression is poor. This is a problem for the print image itself using the same color pair ink. However, there are many problems in color design for the security print product itself in which the print image using the same color pair ink is arranged. This problem is described below.

  When a print image having a special effect of changing the image is formed using a printing method with a small ink transfer amount such as offset printing, the print image is not only monotone but also the print image. There are many restrictions on the colors themselves. Specifically, it is often limited to light colors.

  Even if an ink containing the latest functional pigment having excellent optical change characteristics is used, there is a limit to the amount of ink transfer that can be transferred by offset printing or the like, and as a result, it can be realized with the formed image. The color change and the like are extremely small. This is because, when the original printed image has a high density, it is difficult to recognize the change. For this reason, for example, when printing the latent image printed materials cited in Cited Document 2 to Cited Document 4, equal color pair inks having an extremely light color and a uniform color relationship are required.

  On the other hand, the number of ink colors that can be used at one time by a printing machine is naturally limited. For example, when a four-color printing machine is used to print security prints, it is only for printing this latent image. In addition, it is necessary to use the same color pair ink, and the units of two colors are occupied by the same color ink.

  In addition, when these two colors are extremely light colors, other printing elements required for security prints other than the latent image, such as a background pattern and a color pattern, characters, marks, symbols, description items, etc. Diversion to is difficult. Therefore, when a general four-color printing machine is used, it is necessary to form all regions other than the latent image with two kinds of colors.

  Of course, even if a security print is given priority to functions, the number of colors on the print is large, and it is of course more attractive to have a colorful expression. As described above, it is necessary to use two types of extremely light ink that cannot be diverted, which is a great burden on the color design of the entire security print.

  In the present invention, this problem has been solved by using non-equal color pair inks having greatly different lightness, instead of the conventional color pair inks, in forming the printed pattern (3). By using two different color inks with a certain density instead of the conventional very pale color pair inks, it is possible to express the color of the printed pattern (3) under reflected light without impairing the authenticity discrimination function. In addition to making it possible to enrich, it is also possible to divert inks of different colors to printing elements other than printed images, that is, tint block patterns, tint patterns, characters, marks, symbols, and descriptions, etc. The color of the security printed matter itself on which (3) is formed can be enriched. When manufacturing a security printed matter as an actual problem, it is not necessary to form only the transmission latent image printed matter (1) using a single printing machine, and it is necessary to form the entire security printed matter. The ability to use different colors is a great advantage.

  Another major feature of the image line structure of the present invention is the presence of an information camouflage section (5B) that serves to erase the first significant information under transmitted light. In the prior art, since there is no image element (information camouflage portion (5B)) that conceals the first significant information visually recognized under reflected light under transmitted light, In order to eliminate the first significant information, there is a problem that the visibility of the first significant information under reflected light has to be limited. In the present invention, even when the information camouflage portion (5B) is formed to increase the visibility of the first significant information, the first significant information can be lost under transmitted light. For this reason, compared with the prior art, it is excellent in the visibility of the 1st significant information under reflected light.

  In addition to the second ink, a special functional ink may be used for the first ink. As the functional ink that can be used for the first ink, “colored penetrating ink” that is most effective will be described. Colored penetrating ink is an ink formed by 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.

  Colored penetrating ink can form an image having a clearly visible color under reflected light when printed on a substrate, and has an effect of changing the image extremely lightly under transmitted light. In other words, it is an ink having the effect of “the image looks lighter when seen through” as compared with a normal colored ink. Colored penetrating ink is composed of penetrating component and coloring material, and realizes the effect that the image looks faint due to the increase in transmittance caused by the penetrating component suppressing the scattering of light inside the substrate. .

  If the penetrating component has a performance equivalent to that of ink that is generally sold as watermark ink, a certain amount of coloring material is mixed to make a colored penetrating ink that has the effect of “lightly looks like an image” Is possible. 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.

  The penetrating component in the present invention refers to a component that penetrates into the paper during printing and serves to increase the transmittance of the printing region (2A). Specifically, the refractive index of cellulose (1 .49) resin, wax, animal and vegetable oils and the like. 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.

  Further, the “penetrating ink” in the present invention refers to an ink that contains the aforementioned penetrating component and is generally sold as a watermark ink. Examples of such ink include T & K TOKA's best one watermark ink, Teikoku ink's Unimark, Toyo Ink's SMX watermark ink, and joint ink's E2 varnish. The colored penetrating ink of the present invention can also be produced using these inks.

  When a functional ink with excellent light blocking properties is used for the second ink and a colored penetrating ink is used for one of the first inks, the light transmission of the first image (4) formed with the first ink Since the second image (5) formed with the second ink has lower light transmittance, the difference in lightness and saturation under the reflected light of each ink can be increased. . That is, the color difference between the first ink and the second ink can be increased by lowering the brightness and saturation of the first ink and increasing the brightness and saturation of the second ink. In this case, the color difference between the information portion (4A) and the information camouflage portion (5B) under reflected light is the highest, and the rate of color change between reflected light and transmitted light is also increased. This is a desirable configuration when it is desired to improve the visibility of the first significant information.

  In addition, the emission of fluorescent pigments, fluorescent dyes, phosphorescent pigments, phosphorescent pigments, etc., for the purpose of determining the occurrence of reprinting and printing defects in the first ink and the second ink and improving authenticity discrimination There is no problem even if functional materials such as pigments, luminescent dyes, infrared absorbing materials and infrared reflecting materials are added.

  The printing method of the transmission latent image printed material (1) of the present invention is sufficient for offset printing, but can be formed by flexographic printing, gravure printing, intaglio printing, screen printing, etc. according to the manufacturer's seeds. good.

  In the embodiment, each print element constituting each image is formed by a line. However, the present invention is not limited to this, and each print element may be formed by a pixel or a combination of an image line and a pixel. May be formed. FIG. 7 shows an outline of the configuration of the printed pattern (3 ′) when the printed pattern (3) is formed of pixels.

  The outline of the structure is exactly the same as the configuration of the image-type printed pattern (3) shown in FIG. 2, and the printed pattern (3 ′) is the first image (4 ′) formed with the first ink. And the second image (5 ′) formed with the second ink, the first image (4 ′) is the information portion (4A ′), the latent image camouflage portion (4B ′), the second image ( 5 ′) has a latent image portion (5A ′) and an information camouflage portion (5B ′). The configuration of the printing elements forming each image is as shown in FIG. 8, and the basic structure is the same as the line-type printing pattern (3 ′) shown in FIG. The characteristics required for the first ink and the second ink and other structures required for the printing elements are basically the same. Thus, even if the printing element is not an image line but a pixel, the printed pattern (3 ′) can be formed without any problem.

  The “image line” in the present invention is a printing element in which printing halftone dots, which are the smallest printing elements, are continuously arranged in a certain distance and in a specific direction, and are straight lines, curved lines, wavy lines, dividing lines, and branches. Includes configurations such as lines. A “pixel” is a printing element formed by densely printing dots that are the minimum printing elements, and includes a configuration such as a circle, a polygon, a figure, a character, a symbol, and a number.

  As described above, the configuration of the transmission latent image printed material of the present invention can take various forms. Hereinafter, examples of the transparent latent image printed matter produced specifically will be described in accordance with the best mode for carrying out the invention described above, but the present invention is not limited to these examples.

  This embodiment will be described with reference to FIGS. 9 to 14 using a printed matter having the same configuration as that described in the embodiment. FIG. 9 shows a transmission latent image print (1-1) in the embodiment. The transmission latent image print (1-1) is formed by forming a print pattern (3-1) having a green color on the base material (2-1). Shiraoi manufactured by Nippon Paper Industries Co., Ltd., which is a general white fine paper, was used for the base material (2-1).

  The printed pattern (3-1) includes a first image (4-1) which is an image formed with the first ink shown in FIG. 10 and a second image (5-1) formed with the second ink. ). The first image (4-1) has an information part (4A-1) and a latent image camouflage part (4B-1), and the second image (5-1) has a latent image part (5A-1). ) And an information camouflage section (5B-1). Since the color of the first ink is dark green and the color of the second ink is yellow green, the information part (4A-1) is dark green under reflected light and its background is slightly green to yellow green A slightly dark yellowish green color with the addition of.

  FIG. 11 shows a specific image line configuration of the printed pattern (3-1). The printed pattern (3-1) includes an information element (4a-1) that is a printing element constituting the information portion (4A-1) and a latent image that is a printing element constituting the latent image camouflage portion (4B-1). Camouflage element (4b-1), latent image element (5a-1) which is a printing element constituting the latent image part (5A-1), and information which is a printing element constituting the information camouflage part (5B-1) It has a camouflage element (5b-1). Each of the four elements was continuously arranged in a specific direction (S1 direction in the figure) at a specific pitch (P1) without overlapping each other, thereby forming a printed pattern (3-1).

  FIG. 12 shows the first image (4-1). The information section (4A-1) is formed by arranging a plurality of information elements (4a-1) having a line width of 0.2 mm in the first direction at a pitch of 0.4 mm, and the latent image camouflage section (4B-1). Consists of a plurality of latent image camouflage elements (4b-1) having an image line width of 0.04 mm arranged in a first direction at a pitch of 0.4 mm.

  FIG. 13 shows the second image (5-1). The latent image portion (5A-1) is formed by arranging a plurality of latent image elements (5a-1) having an image line width of 0.16 mm in the first direction at a pitch of 0.4 mm, and an information camouflage portion (5B-1). Is formed by arranging a plurality of information camouflage elements (5b-1) having an image line width of 0.22 mm in the first direction at a pitch of 0.4 mm. In addition, in the information camouflage element (5b-1), the information inversion unit (0.2 mm width same as the information element (4a-1), the same 0.4 mm pitch (P1), and the same phase) 7-1) exists.

  The ink as shown in Table 1 was used as the first ink. This first ink is a deep green colored penetrating ink containing a penetrating component having high light transmittance.

  On the other hand, a light yellow-green ink containing a large amount of titanium dioxide (Best One Panton 381 manufactured by T & K TOKA) was used as the second ink. This first ink has a high light blocking property. The first ink has a color relationship having a reflection density about four times that of the second ink. The printing pattern (3-1) was printed by offset printing with the above-described configuration using the first ink and the second ink.

  The effect of the transmission latent image printed material (1-1) produced with the above structure is demonstrated below using FIG. As shown in FIG. 14 (a), when the transmission latent image printed matter (1-1) is observed under reflected light, the information part (4A-1) is dark green for the observer (9-1). The other part was recognized as a slightly dark yellow-green color, and the letter “A” of the alphabet as the first significant information expressed by the color difference was visually recognized. At this time, the second significant information was hidden by the contrast of the first significant information and was invisible.

  As shown in FIG. 14B, when the transmission latent image printed matter (1-1) is observed under transmitted light, the observer (9-1) has an information section (4A-1) and an information camouflage. The color of the portion (5B-1) becomes the same color, the first significant information disappears and changes to pale yellowish green, and the areas of the latent image portion (5A-1) and the latent image camouflage portion (4B-1) The letter “B” of the alphabet, which is the second significant information expressed by the difference in rate, was visually recognized in dark yellowish green.

  As described above, in the transmission latent image printed matter (1-1) of the present invention, the information in the printed pattern (3-1) is the first significant information under reflected light, and the second significant information under transmitted light. It has been confirmed that it has an effect of changing.

DESCRIPTION OF SYMBOLS 1, 1-1 Transparent latent image printed matter 2, 2-1 Base material 2A Print area 3, 3 ', 3-1 Print pattern 4, 4'4-1 First image 4A, 4A', 4A-1 Information part 4a, 4a ', 4a-1 Information element 4B, 4B', 4B-1 Latent image camouflage section 4b, 4b ', 4b-1 Latent image camouflage element 5, 5'5-1 Second image 5A, 5A', 5A-1 Latent image part 5a, 5a ', 5a-1 Latent image element 5B, 5B', 5B-1 Information camouflage part 5b, 5b ', 5b-1 Latent image camouflage element 7, 7-1 Information inversion part 8, 8-1 Light source 9, 9-1 Viewpoint of observer

Claims (5)

At least a part of the substrate is provided with a light-transmitting print region, and the print region is provided with a printed pattern having a color different from that of the substrate including a plurality of elements,
The printed pattern has the same hue as the first image formed by the first chromatic color ink under reflected light, but the color is different due to at least lightness higher than the first ink, and A second image formed by a second ink that is less light transmissive than the first ink,
The first image is classified as different information into an information part and a latent image camouflage part by at least the phase of elements being different,
The second image is classified as different information into a latent image portion and an information camouflage portion by at least the phase of the elements being different,
The latent image camouflage portion and the latent image portion are negative-positive-inverted and an image having a difference in area ratio within a predetermined range, and are formed in the same color under reflected light,
The information camouflage part and the information part are images having a negative-positive inverted structure, and are formed in the same color under transmitted light,
Under reflected light, the information portion can be visually recognized due to a difference in ink color from the information camouflage portion, and under the transmitted light, the latent image portion can be visually recognized due to an area ratio difference from the latent image camouflage portion. A transmission latent image printed matter characterized by the above.   The transmission latent image printed matter according to claim 1, wherein the second ink contains titanium dioxide.   3. The transmission latent image printed matter according to claim 1, wherein the printing area has penetrability, and the first ink contains a penetrating component. 4.   The transmission latent image printed matter according to claim 1, wherein the elements are arranged without being superimposed.   5. The transmission latent image printed matter according to claim 1, wherein the second ink has higher saturation than the first ink. 6.

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