JP2015112798A - Printed matter having transparent latent image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter preventing forgery of an ink, excellent in forgery resistance, without being confined to an extremely faint color density in a printed image, and changed to a quite different image under reflected light and transmitted light.SOLUTION: A printed matter having a transparent latent image comprises a printed pattern having a color different from an optically transparent substrate on at least a part on the substrate. The printed pattern has: an information image formed by a first chromatically colored ink; a background image formed by a second ink having the characteristics higher in brightness and lower in light transmittance than the first ink; and the latent image partitioned by the difference of area ratios per unit area in a prescribed range using at least the second ink. The first and second inks have the same chromatic color as each other, are different in color by the difference of brightness under reflected light, and are isochromatic under transmitted light.

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.

  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 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 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 transmission latent image printed matter that is excellent in authenticity determination and anti-counterfeiting effects, in which the image observed under reflected light and 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, 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 Transmission latent image (translucent) JP, 2011-143669, A Transmission latent image change (translucent) JP 2012-223905 A Colored transmission latent image

  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.

  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. Prints that are formed with two areas of different lightness and light transmission without being limited to a very light color density, and images that can be observed in different colors under reflected light are equal in color under transmitted light The present invention relates to a transparent latent image printed matter excellent in authenticity determination and anti-counterfeiting effects, characterized in that

  The transmission latent image printed matter according to the present invention includes a printed pattern having a color different from that of the base material on at least a part of the light-transmitting base material, and the printed pattern is information formed by the chromatic first ink. An image, a background image formed by a second ink having characteristics of higher lightness and lower light transmittance than the first ink, and an area ratio per unit area in a predetermined range using at least the second ink The first ink and the second ink are chromatic colors having the same hue, and the colors are different due to the difference in brightness under reflected light, and under transmitted light. The information image is visually recognized due to the difference in color between the first ink and the second ink under reflected light, and the information image and the background image are visually recognized under the reflected light. The latent image is approved for viewing due to the difference in rate. A transparent latent image printed matter characterized in that a.

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

  Further, the first ink of the transmission latent image printed matter of the present invention is characterized by containing a penetrating component.

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

  Furthermore, the latent image of the transmission latent image printed material of the present invention is formed in the background image by a difference in area ratio.

  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 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 1st embodiment of this invention is shown. An example of the outline | summary of a structure of the transmission latent image printed matter in 1st embodiment is shown. The specific structure of the transmission latent image printed matter in 1st embodiment is shown. The specific structure of the transmission latent image printed matter in 1st embodiment is shown. 4 shows another arrangement of the latent image element and the background element of the first embodiment. The figure for demonstrating the visual recognition state of the transmission latent image printed matter in 1st embodiment is shown. The transmission latent image printed matter in 2nd embodiment of this invention is shown. An example of the outline | summary of a structure of the transmission latent image printed matter in 2nd embodiment is shown. The specific structure of the transmission latent image printed matter in 2nd embodiment is shown. The transmission latent image printed matter in 3rd embodiment of this invention is shown. An example of the outline | summary of a structure of the transmission latent image printed matter in 3rd embodiment is shown. The concrete structure of the transmission latent image printed matter in 3rd embodiment is shown. The concrete structure of the transmission latent image printed matter in 3rd embodiment is shown. The transmission latent image printed matter of the Example in this invention is shown. An example of the outline | summary of a structure of the transmission latent image printed matter of the Example in this invention is shown. The specific structure of the transmission latent image printed matter of the Example in this invention is shown. The specific structure of the transmission latent image printed matter 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.

(First embodiment)
FIG. 1 shows a printed latent image (1) in the present invention. The transmission latent image printed matter (1) is formed by forming a printed pattern (3) having a plurality of colors different from the substrate (2) on the substrate (2).

  The base material (2) constituting the transparent latent image 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). Further, the two colors of the printed pattern (3) may be any color as long as they are different 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 chromatic colors and have the same hue under reflected light. However, the lightness and saturation are different, so the colors are different, and in addition, the light transmission is different. Specific 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 an image (4) formed with the first ink and an image (5) formed with the second ink. The image (4) formed with the first ink in the first embodiment is an information image (4) and represents the first significant information visually recognized under reflected light. The first significant information in the first embodiment is an image of “鳳凰”. Since the first ink and the second ink have different colors, the image (4) formed with the first ink and the image (5) formed with the second ink are classified by different colors.

  The image (5) formed with the second ink has a background image (5A) and a latent image (5B). The background image (5A) is an image that forms a pair with the information image (4), and is an image for camouflaging the information image (4) under transmitted light. It is an image of composition. The latent image (5B) is an image representing second significant information different from the first significant information, and the second significant information in the first embodiment is the letter “OK” in the alphabet. is there. As described above, the printed pattern (3) includes three images: the information image (4), the background image (5A), and the latent image (5B).

FIG. 3 shows an enlarged part of the image line structure of the printed pattern (3). The printed pattern (3) includes an information element (6) that is an element constituting the information image (4), a background element (7A) that is an element constituting the background image (5A), and a latent image (5B). Three elements of the latent image element (7B), which are constituent elements, are provided. The three elements are continuously arranged in a specific direction (S1 direction in the figure) at a specific pitch (P1) without overlapping each other to constitute the printed pattern (3).

The information image (4) is formed by successively arranging information elements (6) having a specific line width (W1) at a specific pitch (P1) in a specific direction (direction S1 in the figure). Further, as shown in FIG. 4, a background image (5A) which is an image (5) formed with the second ink and a latent image (5B) are provided, and each of the background images (5A) has a specific image line. A background element (7A) having a width (W2) is continuously arranged at a specific pitch (P1) in a specific direction (direction S1 in the figure), and one latent image (5B) has a specific image. The latent image element (7B) having the line width (W3) is paired in pairs so as to be in contact with the upper and lower ends of the background element (7A). Consecutively arranged.

  In the background element (7A), an information inversion element (8) which is paired with the information element (6) and has the same size is arranged. The outline of each information inversion element (8) and information element (6) has a completely matching structure, and the information element (6) is fitted to the information inversion element (8) in the background element (7A). Have. The information element (6) and the information inversion element (8) forming a pair are configured to be 100% by adding the respective area ratios. For example, when the information element (6) is configured with 100% solid, The information reversal element (8) is 0% nuisance, and when the information element is configured with an area ratio of 50%, the area ratio of the information reversal element (8) is 50%.

  The line width (W2) of the background element (7A) needs to be equal to or larger than the line width (W1) of the information element (6). This is because, when the line width (W2) of the background element (7A) is smaller than the line width (W1) of the information element (6), the information element (6) is hidden by the background element (7A) under transmitted light. This is because the image change effect that is a feature of the present invention is impaired.

  In the first embodiment, the latent image element (7B) has been described in the form in which the two elements are arranged as a pair with the background element (7A) sandwiched between the upper and lower sides, but the two elements need to be paired. However, as shown in FIG. 5, the latent image element (7B) having a certain area at a position not overlapping with the information element (6) and the background element (7A) is not required to be in contact with the background element (7A). Should be arranged. In the first embodiment, each of the information element (6), the background element (7A), and the latent image element (7B) is composed of an image line. It may be formed, or may be composed of a combination of an image line and a pixel. A form formed by pixels will be described later.

The area ratio of the latent image element (7B) is determined by the color and light transmittance of the first ink and the second ink used. For example, when the brightness of the second ink is low, the area ratio of the latent image element (7B) needs to be lowered, and when the brightness of the second ink is high, the area ratio of the latent image element (7B) needs to be increased. There is.

  The first ink and the second ink constituting the printed pattern (3) need to have the same hue, but the lightness and saturation need to be different, and as a result, the colors are different. In particular, the brightness needs to be low for the first ink and high for the second ink. In this case, “lightness is high” and “lightness is low” indicate whether the lightness is relatively high or low compared to the other region. Further, the second ink needs to have a low light transmittance as compared with the first ink. As described above, since the image (4) formed with the first ink and the image (5) formed with the second ink have different brightness and saturation, they are visually recognized in different colors.

In addition, the brightness in this specification refers to the brightness of a color, and is bright when it is high and dark when it is low. 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 region 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.

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.

The first ink and the second ink need to have different light transmission properties. Specifically, the light transmittance of the first ink needs to be high, and the light transmittance of the second ink needs to be low. 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 addition, the information image (4) formed with the first ink and the image (5) formed with the second ink are observed in different colors under reflected light, but are the same color under transmitted light. Need to change. 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. In the region with low light transmittance, the lightness is lowered to change to a dark color, and in the region (5) having high light transmittance, the lightness is mainly increased to change to a bright color. Therefore, the color of the information image (4) with low lightness of the color under reflected light has a high lightness under the transmitted light, and the image (5) formed with the second ink with high lightness of the color under reflected light. Since the brightness of the color decreases, the colors under the reflected light and the respective light transmissivity are controlled to balance the colors of the image formed with the two inks under the transmitted light so that they are the same color. be able to.

In addition, not only lightness but also saturation changes under transmitted light. Under transmitted light, the saturation of the image (4) formed with the first ink is relatively increased, while the saturation of the image (5) formed with the second ink is decreased. Therefore, if the saturation of the image (4) formed with the first ink under reflected light is designed to be low and the saturation of the image (5) formed with the second ink is designed to be high, It is easy to be the same color. Pure colors that are not mixed 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 each image (4, 5) but also the saturation is greatly different, the color expression becomes richer, so that the appearance of the printed image is improved, which is 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 second ink is a normal colored ink, Even if 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. 6A, when the transmission latent image printed matter (1) is observed under reflected light, the information image (4) and the background image (5A) are more than the difference in the area ratio of the latent image (5B). ) Is more emphasized, the latent image (5B) is visually concealed by the difference in color between the information image (4) and the background image (5A). As a result, the information image (4 The first significant information (“鳳凰”) represented by) is visually recognized.

  Further, as shown in FIG. 6B, when the transmission latent image printed matter (1) is observed under transmitted light, the information element (4), the background element (5A), and the latent image element (5B) are based on the above-described principle. Therefore, the first significant information represented by the information element becomes invisible, and instead, the second significant information (“OK”) represented by the latent image (5B) is visually recognized by the difference in area ratio. .

  As described above, the transmission latent image printed matter (1) of the present invention is characterized in that the information represented by the printed pattern (3) is the first significant information under reflected light and can be visually recognized as the second significant information in the transmission effect. And

  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 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 is solved by using not the same color pair ink as in the prior art but the non-color pair ink having greatly different brightness 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.

  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 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 second ink and a colored penetrating ink is used for the first ink, the light transmittance of the image (4) formed with the first ink is more The light transmittance of the image (5) formed with the second ink is lower and the difference in brightness and saturation 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 image (4) and the background image (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 it is desired to increase the visibility of the first significant information.

  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.

  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 first embodiment, the latent image (5B) is composed of only the second ink, but the latent image (5B) may be represented by each of the first ink and the second ink. The specific method will be described below as a second embodiment.

(Second embodiment)
FIG. 7 shows a transmission latent image print (1 ′) according to the second embodiment. The transmission latent image printed matter (1 ′) is formed by forming a printed pattern (3 ′) having a plurality of colors different from the substrate (2 ′) on the substrate (2 ′).

  FIG. 8 shows an outline of the configuration of the printed pattern (3 '). The transmission latent image print (1 ′) of the second embodiment has an image (4 ′) formed with the first ink and an image (5 ′) formed with the second ink. Among the images (4 ′) formed with the ink, there is a first latent image (4B ′) in addition to the information image (4A ′). The image (5 ') formed with the second ink includes a background image (5A') and a second latent image (5B '). By combining the first latent image (4B ') and the second latent image (5B'), the letter "OK", which is the second significant information, is formed. In the first embodiment, the latent image is formed with only the second ink. However, as in the second embodiment, the latent image can be formed with both the first ink and the second ink. In this configuration, as shown in FIG. 9, among the letters “OK” of the alphabet, the first latent image element (6B ′) in contact with the information element (6A ′) is the first ink and the background element. The second latent image element (7B ′) in contact with (7A ′) may be formed of the second ink. Since the following configuration is the same as that of the first embodiment, description thereof is omitted.

  Comparing the transmission latent image print (1) of the first embodiment with the transmission latent image print (1 ′) of the second embodiment, the concealment of the latent image (5B) under reflected light is as follows. The latent latent image (5B) is composed of the second ink having a high lightness and is difficult to be visually recognized. The transparent latent image printed matter (1) according to the first embodiment is more excellent. With regard to the ease of manufacture including the printing, the transmission latent image print (1 ′) of the second embodiment is excellent.

  Subsequently, a third embodiment will be described. In the first embodiment and the second embodiment, all the elements are configured by the drawing lines, but the elements may be expressed by pixels. A specific method will be described below as a third embodiment.

(Third embodiment)
FIG. 10 shows a transmission latent image print (1 ″) according to the third embodiment. The transmission latent image print (1 ″) is formed by forming a printed pattern (3 ″) having a plurality of colors different from the substrate (2 ″) on the substrate (2 ″).

  FIG. 11 shows an outline of the configuration of the printed pattern (3 ″). The printed pattern (3 ″) of the transmission latent image print (1 ″) according to the third embodiment is composed of pixels. The printed pattern (3 ″) has an information image (4 ″) that is an image formed with the first ink and an image (5 ″) formed with the second ink. Among the images (5 ′) formed by the above, there are a background image (5A ″) and a latent image (5B ″).

FIG. 12 is an enlarged view showing a part of the image line structure of the printed pattern (3 ″). The printed pattern (3 ″) includes an information element (6 ″) that is an element constituting the information image (4 ″) and a background element (7A ″ that is an element constituting the background image (5A ″). ) And a latent image element (7B ″) which is an element constituting the latent image. Each of the three elements has a pixel shape, but the specific pitch (P1) without overlapping each other as described in the first embodiment and the second embodiment is the same as the shape of the image line shape. Are arranged continuously in specific directions (directions S1 and S2 in the figure) to form a printed pattern (3 ″).

The information element (4 ″) is pixel shape information having a specific width (W1) in the first direction (S1 direction in the drawing) and a specific height (W2) in the second direction (S2 direction in the drawing). The elements (6 ″) are continuously arranged at a specific pitch (P1) in the first direction and at a specific pitch (P2) in the second direction. Further, as shown in FIG. 13, the background image (5A ″) which is the image (5 ″) formed with the second ink and the latent image (5B ″) are in the first direction (FIG. A pixel-shaped background element (7A ″) having a specific width (W3) in the middle S1 direction and a specific height (W4) in the second direction (S2 direction in the figure) has a specific pitch in the first direction. (P1) is continuously arranged at a specific pitch (P2) in the second direction, with a specific width (W5) in the first direction (S1 direction in the figure) and a second direction (S2 in the figure). Direction) and a pixel-shaped latent image element (7B ″) having a specific height (W6) continuously in the first direction at a specific pitch (P1) and in the second direction at a specific pitch (P2). It is arranged.

  Further, in the background element (7A ″), an information inversion element (8 ″) that is paired with the information element (6 ″) and has the same size is arranged. The information element (6 ″) and the information inversion element (8 ″) forming a pair are configured to be 100% when the respective area ratios are added, for example, the information element (6 ″) is 100% solid. When configured, the information reversal element (8 ″) is 0% nuisance, and when the information element is configured with an area ratio of 50%, the area ratio of the information reversal element (8 ″) is 50%. It becomes.

  The width (W3) in the first direction of the background element (7A ″) needs to be equal to or larger than the width (W1) in the first direction of the information element (6 ″), and the background element (7A ′) The height (W4) in the second direction of ') needs to be equal to or greater than the width (W2) in the second direction of the information element (6' '). This is because when the background element (7A ″) is smaller than the information element (6 ″), it is impossible to hide the information element (6 ″) with the background element (7A ″) under transmitted light. This is because the image change effect which is a feature of the present invention is impaired. Since the following configuration is the same as that of the first embodiment, description thereof is omitted.

  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. 14 to 18 using the same form as that described in the first embodiment. FIG. 14 shows a transmission latent image print (1-1) in the example. 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). As the base material (2-1), general white fine paper (manufactured by Shiraoi Nippon Paper Industries) was used.

  The printed pattern (3-1) was composed of an information image (4-1) which is an image formed with the first ink shown in FIG. 15 and an image (5-1) formed with the second ink. The image (5-1) formed with the second ink has a background image (5A-1) and a latent image (5B-1). Since the color of the first ink is dark green and the color of the second ink is yellow green, the information image (4) is dark green and the image (5-1) formed with the second ink is yellow It turned green.

  FIG. 16 shows a specific image line configuration of the printed pattern (3-1). Each image line was continuously arranged in the first direction (S1 direction) with a pitch of 0.4 mm. In addition, the information image (4-1) was configured by arranging information elements (6-1) having a line width of 0.25 mm continuously in a first direction (S1 direction) at a pitch of 0.4 mm.

  FIG. 17 shows an image (5-1) formed with the second ink. The image (5-1) formed with the second ink has a background image (5A-1) and a latent image (5B-1). The background image (5A-1) is configured by continuously arranging background elements (7A-1) having a line width of 0.28 mm in the first direction (S1 direction) at a pitch of 0.4 mm. The image (5B-1) is continuously arranged at a pitch of 0.4 mm in the first direction (S1 direction) as a pair of two image lines of the latent image element (7B-1) having an image line width of 0.04 mm. And configured. In addition, each latent image element (7A-1) is paired with each information element (6-1), and an information inversion element (8-1) having the same size as the information element is provided with a blank. Arranged.

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 green ink containing a large amount of titanium (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 printing pattern (3-1) was printed by offset printing with the above-described configuration using the first ink and the second ink.

The color of the first ink in this example is L ^* = 69.32 a ^* = − 15.15 b ^* = 57.17, and the color of the second ink is the L ^* a ^* b ^* color system. L ^* = 80.36 a ^* = − 14.88 b ^* = 63.52, the lightness difference ΔL ^* between the first ink and the second ink is about 11, and the first The saturation of the ink was 59.1, the saturation of the second ink was 65.2, and the saturation difference ΔC ^* ab was about 6. The color difference ΔE between the two inks was 12.7.

  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. 18A, when the transmission latent image printed matter (1-1) is observed under reflected light, the information image (4-1) is dark green for the observer (10-1). The background image (5A-1) was recognized as yellowish green, and an image of “鳳凰”, which is the first significant information expressed by the color difference, was visually recognized. At this time, the latent image (5B-1) was hidden by the contrast of the first significant information and was invisible.

  As shown in FIG. 18B, when the transmission latent image printed matter (1-1) is observed under transmitted light, the observer (10-1) has an information image (4-1) and a background image. The color of (5-1) looks the same green, and as a result, the letter “OK” of the alphabet, which is the second significant information that appears in the latent image (5B-1) expressed by the difference in area ratio, is green. It was visually recognized.

  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.

1, 1 ′, 1 ″, 1-1 transmission latent image print 2, 2 ′, 2 ″, 2-1 substrate 3, 3 ′, 3 ″, 3-1 printed pattern 4, 4 ′, 4 '' 4-1 Image 4, 4A ', 4'', 4-1 information image 4B' formed with first ink First latent image 5, 5 ', 5'', 5-1 Images 5A, 5A ′, 5A ″, 5A-1 formed by two inks Background images 5B, 5B ″, 5B-1 Latent image 5B ′ Second latent images 6, 6 ″, 6- 1 Information element 7A, 7A ″, 7A-1 Background element 7B, 7B ″, 7B-1 Latent image element 8, 8 ″, 8-1 Information inversion element 9, 9-1 Light source 10, 10-1 Observation Perspective

Claims (5)

At least part of the light-transmitting substrate has a printed pattern with a color different from that of the substrate,
The printed pattern is an information image formed with a chromatic first ink, and a background image formed with a second ink having characteristics of higher brightness and lower light transmittance than the first ink. And a latent image image divided by a difference in area ratio per unit area in a predetermined range using at least the second ink,
The first ink and the second ink are chromatic colors of the same hue, differ in color due to the difference in brightness under reflected light, and are equal in color under transmitted light,
The information image is visually recognized due to a color difference between the first ink and the second ink under reflected light, and the information image and the background image are visually recognized under the same color under transmitted light. A transmission latent image printed matter, wherein the latent image is visible due to a difference in rate. 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 2, wherein the first ink contains a penetrating component. 4. The transmission latent image printed matter according to claim 1, wherein the first ink has a lower saturation than the second ink. 5. The transparent latent image printed matter according to any one of claims 1 to 4, wherein the latent image is arranged in the area of the background image by a difference in area ratio.

Images