JP6120084B2 - Transparent pattern printed matter - 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 an anti-counterfeit effect, the present invention provides an image under reflected light and transmitted light. This relates to a transparent pattern printed matter in which the color of the part changes.

  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 watermarking technique in which a pattern is formed by the density or thinness of a sheet and 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 must be formed at the paper manufacturing stage, it cannot be manufactured by a paper manufacturer. In addition, even if the paper manufacturer manufactures it, there is a problem that the manufacturing cost increases. As a method for reproducing the image, there is a forgery prevention technique in which a transmission image corresponding to the 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, Since it is also readily available, there is a problem that it is easy for a counterfeiter to produce.

  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 transparent latent image printed matter excellent in authenticity determination and anti-counterfeiting effect formed by forming a transmission image that is visible under transmission light that is different from the reflection image that is visible under reflection light (for example, Patent Documents) 2, see Patent Document 3).

  In addition, the present applicant is a printed matter that forms an image with a special and complicated halftone dot configuration, with a pair of inks that are a pair of a color penetrating ink and a color penetrating ink in which a coloring pigment is mixed with a penetrating 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).

JP-A-6-228900 JP 2011-37234 A JP 2011-143669 A 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. Since it can be produced only by finely adjusting the color by adding a small amount of coloring pigment, there is a problem that forgery is relatively easy for those involved in the production of special ink.

All of the techniques described in Patent Documents 2 to 4 need to be formed using a pair of color-matched inks having a very light density, and the color of the latent image print is limited to a light monotone tone, so the color expression is poor. There was a problem. 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. Since such a dedicated pair of ink occupies two printing cylinders of the printing press, the number of colors that can be used other than the latent image is limited, which is a major limitation in designing the color of the entire security printed matter. It was.

  In addition, the techniques described in Patent Document 3 and Patent Document 4 have a so-called image change effect in which significant information that has been viewed under diffusely reflected light changes to different significant information that has no correlation under regular reflected light. In order to obtain the desired effect, the technology must be printed so that a plurality of fine printing elements do not overlap each other, and printing with extremely high accuracy is required, and the printer is high. A skill and a high-precision printing machine are indispensable, and there was a problem that manufacturing difficulty was high.

  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. Color is not limited to extremely light density, high-precision printing is not required, high skill of the printer and high-precision printing machine are not required, and constant without using special penetrating ink It is an object of the present invention to provide a transparent pattern printed matter that exhibits an effect.

Furthermore, by making the two areas different in lightness and light transmittance, an image that can be observed in different colors under reflected light changes to the same color under transmitted light. It provides an excellent transparent pattern printed matter.

The present invention, on at least a part of the base material having optical transparency, includes a printed image of a color different from the base material, the printed image, the hue is made from the same first and second regions, the first This region is lighter than the second region and has a low light transmission, so that it is formed in the same color under the transmitted light as the second region, and the first region and the first region under the reflected light. The second area is a transparent pattern printed matter characterized in that the first area and the second area have the same color under transmitted light.

  The transmissive pattern printed matter of the present invention is characterized by being formed of a first ink having light blocking properties.

  In the transmissive pattern printed matter of the present invention, the first ink contains a metal pigment having a high light shielding property.

  Moreover, the transmissive pattern printed matter of the present invention is characterized in that the second region is formed by the second ink having a characteristic that the light blocking property is lower than that of the first ink.

  In the transmissive pattern printed matter of the present invention, the second ink is a colored penetrating ink.

  Furthermore, the transparent pattern printed matter of the present invention is characterized in that the first region has higher saturation than the second region.

  The transmissive pattern printed matter of the present invention comprises two regions which are different in color under reflected light and change to the same color under transmitted light. The paired ink used to form each region cannot be made by blending the same amount of the same pigment as the conventional paired ink that is the same color under reflected light and changes to a different color under transmitted light. Therefore, more specialized knowledge is required for production. 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 image of the transparent pattern printed matter of the present invention is different from the printed image of the prior art, and the two regions included in the printed image are different in color, and the color density does not need to be extremely light, so that the degree of freedom of color selection is high. It is much wider. Therefore, the printed image of the transparent pattern printed material can express rich in color as compared with the conventional latent image produced with the same color pair ink, which is limited to monochromatic color expression. In addition, paired inks can be diverted to printing areas other than those to which the print image of the present invention is applied in security printed materials, respectively, so that the entire security printed material is rich in color changes compared to conventional techniques. It can be a design.

  Since the transparent pattern printed matter of the present invention has a simple configuration in which the two print areas are formed with different inks, it does not require high-precision printing as in the prior art, and the manufacturing difficulty is low.

  The transparent pattern printed matter formed by the above method can be manufactured by offset printing which is a highly productive printing method, so it has excellent cost performance, and even if the latest digital equipment is used, it is impossible to reproduce the transmitted image Therefore, the anti-counterfeiting effect is excellent. Moreover, since it can authenticate only by seeing through without using a special tool, it is excellent in distinguishability.

The transparent pattern printed matter in this invention is shown. The outline | summary of a structure of the transparent pattern printed matter in this invention is shown. (A) shows the image by which the transmissive pattern printed matter in this invention is visually recognized under reflected light, (b) shows the image by which the transmissive pattern printed matter in this invention is visually recognized under transmitted light. The outline | summary of a structure of the transparent pattern printed matter in this invention is shown. (A) shows the image by which the transmissive pattern printed matter in this invention is visually recognized under reflected light, (b) shows the image by which the transmissive pattern printed matter in this invention is visually recognized under transmitted light.

  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.

  In FIG. 1, the transparent pattern printed matter (1) in this invention is shown. The transparent pattern printed matter (1) is formed by forming a printed image (3) having a color different from that of the substrate (2) on the substrate (2).

  The base material (2) constituting the transmissive pattern printed matter (1) in the present invention needs to have a property of transmitting light, 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) or a printed image (3).

  FIG. 2 shows an outline of the configuration of the print image (3). The print image (3) has two areas, a first area (4) and a second area (5). In the present embodiment, the printed image (3) represents the entire cherry blossom petals, the first region (4) represents three petals, and the second region (5) represents two petals. The print image (3) may have any color other than transparent as long as it has a color different from that of the substrate (2).

  The first area (4) and the second area (5) constituting the print image (3) need to have the same hue, but have different colors, lightness and saturation, Need to be different. The first area (4) has high lightness, and the second area (5) has low lightness. In this case, “lightness is high” and “lightness is low” indicate whether the lightness is relatively high or low compared to the other region.

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 region is high and the lightness of the second region is low” is an absolute condition that satisfies the relative relationship as described above. The lightness L ^* values of the L ^* a ^* b ^* color system of the first region and the second region must be different by a lightness difference ΔL = 5 or more, more preferably 10 or more. desirable.

In addition, the first area (4) and the second area (5) are colored to such an extent that the two areas are not the same color but different colors only by glance without particular attention. Need to be different. Specifically, the color difference ΔE in the L ^* a ^* b ^* color system needs to be different by 6 or more, and more preferably, the color difference ΔE is 12 or more apart.

Further, the first region (4) and the second region (5) need to have different light transmittances. Specifically, the first region (4) needs to have low light transmission, and the second region (5) needs to have high light transmission. In forming the first area (4) and the second area (5), if this characteristic is realized only by the characteristics of the ink, the first ink that forms the first area (4) It is necessary to give higher light blocking properties as compared with the second ink which is the ink forming the second region (5). This is an essential characteristic for producing the effect under the transmitted light of the present invention.

  When the low light transmittance of the first region (4) is realized by the performance of the ink, the first ink forming the first region (4) needs to have high light blocking properties. Specifically, an ink containing a metal pigment having high light reflectivity such as titanium dioxide, iron oxide, zinc oxide, or the like, 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, when the high light transmittance of the second region (5) is realized by the performance of the ink, the second ink forming the second region (5) does not need to have a high light blocking property. Compared with one ink, it is necessary that the light blocking property is relatively low. As 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.

  The difference in light transmittance between the first region (4) and the second region (5) is not limited to the method realized by the optical characteristics of the first ink and the second ink. This can also be realized by applying black and white holes to the material (2). The black transparent part has low light transmission, and the white transparent part has high light transmission. Two regions may be formed by overlapping inks having different lightness on the transparent portion.

  The first region (4) and the second region (5) 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 changes to a cloudy color due to a decrease in lightness, and a region (5) with high light transmittance increases into a bright color with an increase in lightness. Therefore, the lightness of the first region (4) having high lightness of the color under reflected light has a low lightness, and the color of the second region (5) having low lightness of the color under the reflected light has lightness. Therefore, by controlling the color under each reflected light and the respective light transmission properties, the two regions can be made the same color under the transmitted light. The color matching described here means that the color difference ΔE between the first region (4) and the second region (5) is 5 or less.

In addition, not only lightness but also saturation changes under transmitted light. Under transmitted light, the saturation of the first region (4) decreases relatively, while the saturation of the second region increases. For this reason, the saturation of the first region (4) under reflected light may be designed high and the saturation of the second region (5) may be designed low. Pure colors that are not mixed are highly saturated, and the values of achromatic colors such as white, gray, and black are close to zero. When not only the brightness of the first region (4) and the second region (5) but also the saturation is greatly different, the color expression becomes richer, and the appearance of the printed image is improved, which is more preferable. Colors with different lightness can be expressed by the difference in area ratio using the same ink, but colors with greatly different saturation can be expressed only by a simple difference in area ratio using the same ink. It is more difficult to reproduce and has a better form of counterfeit resistance.

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

  The effect of the transparent pattern printed matter (1) formed with the above configuration will be described with reference to FIG. As shown in FIG. 3, when the transmissive pattern printed matter (1) is observed under reflected light, the observer (7) prints the first region (4) and the second region (5) in different colors. Image (3) is visually recognized.

  Moreover, as shown in FIG.3 (b), when the transparent pattern printed matter (1) is observed under transmitted light, the observer (7) has a first region (4) and a second region (5). The printed image (3) in which is changed to the same color is visually recognized.

  As described above, in the transparent pattern printed matter (1) of the present invention, the first region (4) and the second region (5) in the printed image (3) have different colors or the first color is changed depending on the observation conditions. One region (4) and the second region (5) have the effect of being the same color.

  In the present invention, “observation under reflected light” means that the observer's viewpoint is in a region where there is almost no specular reflection light, and the transmissive pattern printed matter (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 printed printed pattern (1) is observed. ing.

  The greatest feature of the transparent pattern printed matter (1) of the present invention is that two regions of the same color are formed using pair inks having the same hue but different brightness. The true / false discrimination function that can be discriminated based on the change in the color relationship between the two areas under reflected light and transmitted light is basically different from the conventional technology that forms two areas in the same color. This function is not impaired. On the other hand, when a configuration using non-equal color pair inks is 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 latent image printed matter formed using the same color pair ink, the print image in which the image changes can only represent a monotone image without expressing information only by the change in shading. Because there is no color expression. 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.

  Needless to say, even if it is a security printed matter where functions are prioritized, the number of colors on the printed matter is large, and it is more attractive to have a colorful expression. The fact that two types of extremely light ink that cannot be applied to the ink must be used has been a great burden on the color design of the entire security print.

  In the present technology, this problem has been solved by using non-equal color pair inks having greatly different brightnesses instead of the conventional color pair inks in forming the printed image (3). The color expression of the printed image (3) under reflected light without impairing the true / false discrimination function by combining two different color inks with a certain density, instead of the conventional very pale color pair ink. In addition to the richness of ink, it is also possible to use inks of different colors for printing elements other than printed images, ie, background patterns, colored patterns, characters, marks, symbols, items to be printed, etc. It is possible to enrich the color of the security printed matter itself that is formed. When manufacturing a security printed matter as an actual problem, it is not necessary to form only the transparent pattern printed matter (1) using a single printing machine, and it is necessary to form the entire security printed matter. The ability to use many different colors is a great advantage.

  Further, the area ratios of the printing elements in the first region (4) and the second region (5) need not be the same, and the color matching under reflected light and the color difference during transmission are improved. Therefore, as necessary, adjust the area ratio of the first area (4) and the second area (5), the thickness of the printed film thickness, the halftone dots per unit area, the density of the image line, etc. You may do it.

  In addition to the first ink, a special functional ink may be used for the second ink. As a functional ink that can be used for the second 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 functions to increase the transmittance of the printing region by penetrating into the paper during printing. Specifically, the refractive index of cellulose (1.49) Refers to resin, wax, animal and vegetable oils, etc. 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 Unimark, Toyo Ink SMX watermark ink, Joint ink E2 varnish, and the like. The colored penetrating ink of the present invention can also be produced using these inks.

  When a functional ink having excellent light blocking properties is used for the first ink and a colored penetrating ink is used for the second ink, the light transmittance of the first region (4) is low, and the second region Since the light transmittance of (5) becomes high, the difference in brightness of each ink can be increased. That is, the color difference between the first ink and the second ink can be increased by increasing the brightness of the first ink and decreasing the brightness of the second ink. In this case, the color difference between the first region (4) and the second region (5) 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 priority is to be given.

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

In the description of the embodiment, the print image (3) represents significant information representing cherry blossom petals, and the example in which the significant information changes to a different color under transmitted light has been described. However, in the example illustrated in FIG. As described above, the first area (4 ′) and the second area (5 ′) are composed of two images in which the density of one significant information (the letter “A” in the alphabet) is inverted. By forming the print image (3 ′), as shown in FIG. 5, significant information that can be recognized under reflected light may be lost under transmitted light.

  The printing method of the transparent pattern printed matter (1) of the present invention exhibits a sufficient effect by offset printing, but may be formed by flexographic printing, gravure printing, intaglio printing, screen printing, etc. according to the manufacturer's seeds. .

  Hereinafter, although the Example of the transparent pattern printed matter produced specifically according to the form for implementing the above-mentioned invention is described in detail, this invention is not limited to this Example.

  This embodiment will be described with reference to FIGS. 1 to 3 as in the embodiment. FIG. 1 shows a transparent pattern printed material (1) in Example 1. The transparent pattern printed matter (1) is formed by forming a printed image (3) having a green color on the base material (2). As the base material (2), general white fine paper (manufactured by Shiraoi Nippon Paper Industries) was used.

  The print image (3) was composed of a first area (4) and a second area (5) shown in FIG. In observation under reflected light, the first region (4) is yellow-green and the second region (5) is dark green.

  The first region (4) was formed using the first ink in a solid configuration with an area ratio of 100% as shown in FIG. As the first ink, a light green ink containing a large amount of titanium (Best One Panton 381 light light green manufactured by T & K TOKA) was used. This first ink has a high light blocking property. The first region (4) having the above configuration was printed by offset printing.

  The second region (5) has a solid structure with a dot area ratio of 100% as shown in FIG. 2 (b) and was formed using the second ink. This was printed using the second ink shown in Table 1. This second ink is a deep green colored penetrating ink containing a penetrating component having high light transmittance.

The color of the first region (4) in this example is L ^* a ^* b ^* color system value L ^* = 80.36 a ^* =-14.88 b ^* = 63.52, The color of region (5) was L ^* = 69.32 a ^* = − 15.15 b ^* = 57.17. The brightness difference ΔL ^* between the first region (4) and the second region (5) is about 11, the saturation of the first region (4) is 65.2, and the second region (5 ) Was 59.1 and the saturation difference ΔC ^* ab was about 6. Further, the color difference ΔE between these two regions was 12.7.

  The effect of the transparent pattern printed material (1) produced with the above structure is demonstrated below using FIG. As shown in FIG. 3 (a), when the transmissive pattern printed matter (1) is observed under reflected light, the observer (7) tells the first region (4) yellow-green and the second region ( 5) was visible in dark green.

  Moreover, as shown in FIG.3 (b), when the transparent pattern printed matter (1) is observed under transmitted light, the observer (7) has a first region (4) and a second region (5). The printed image (3) in which the color changed to the same green color was visually recognized.

  As described above, in the transparent pattern printed matter (1) of the present invention, the first region (4) and the second region (5) in the printed image (3) have different colors, or the first region is different depending on the observation conditions. It was confirmed that the first region (4) and the second region (5) had the effect of being the same color.

DESCRIPTION OF SYMBOLS 1 Transparent pattern printed matter 2 Base material 3 Printed image 4 1st area | region 5 2nd area | region 6 Light source 7 Observer's viewpoint

Claims (6)

Provided with a printed image of a color different from that of the substrate on at least a part of the substrate having light transparency,
The printed image is composed of a first region and a second region having the same hue,
The first region is higher in brightness than the second region and has low light transmission, so that the first region is formed in the same color under transmitted light,
Under the reflected light, the first area and the second area can be visually recognized with different colors depending on the difference in brightness, and under the transmitted light, the first area and the second area are of the same color. A transparent pattern printed matter characterized by comprising: The transmissive pattern printed matter according to claim 1, wherein the first region is formed of a first ink having a light blocking property. The transmissive pattern printed matter according to claim 2, wherein the first ink contains a metal pigment having a high light blocking property. 4. The transmissive pattern printed matter according to claim 2, wherein the second region is formed of a second ink having a low light blocking property as compared with the first ink. 5. The transmissive pattern printed matter according to claim 4, wherein the second ink is a colored penetrating ink.   The transparent pattern printed matter according to claim 1, wherein the first region has higher saturation than the second region.

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