JP2015112797A - 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 the faint color density in printed image and changed to an image having no correlation under reflected light and transmitted light.SOLUTION: A printed matter having a transparent latent image has a printed pattern having a color different from an optically transparent substrate on the substrate. The printed pattern comprises plural elements arranged so that an information element formed by a first chromatically colored ink, a camouflage element formed by a second ink lower in brightness and higher in light transmittance than the first ink, and a transmitted image element formed by a third ink having the same brightness as that of the second ink and lower in light transmittance than that, do not lap over each other. The first to third inks are equal in hue, the second and third inks are isochromatic under reflected light, and the first and second inks are isochromatic under transmitted light. A visible image is formed by the information element, and a transmitted image is formed by the transmitted image element.

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 transparent latent image printed matter that is excellent in authenticity discrimination and anti-counterfeiting effects, in which an 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 by pairing a colored penetrating ink in which a coloring pigment is mixed with a penetrating ink and an ink of the same color as the colored penetrating ink. An application has already been filed for a transmission latent image printed matter characterized in that an image observable under reflected light and an image observable under transmitted light are different images having 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 Document 2 to Patent Document 4 need to be formed using a pair of color-matched inks of extremely light density, and the color of the latent image printed product is limited to monotone, so that the color expression is poor. There was a problem. In addition, since the color of the pair ink needs to have an extremely light color density, there is a problem that the visibility of a visible image viewed under reflected light is low.

  The present invention aims to solve the above-mentioned problems, and it is difficult to counterfeit ink, has excellent counterfeit resistance, the color of a printed image is not limited to a very light density, and has a dark color density under reflected light. The present invention relates to a transparent latent image print excellent in authenticity determination and anti-counterfeiting effects, characterized in that a visible image with high visibility constituted by is changed to a completely different latent image under transmitted light.

  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. The element and the camouflage element formed by the second ink, which has lower lightness and higher light transmission properties than the first ink, and the same lightness as the second ink, and more light transmission than the second ink A plurality of transmission image elements formed by the third ink having low properties are arranged so as not to overlap each other, the hues of the first ink, the second ink and the third ink are equal, and the reflected light Below, the second ink and the third ink are of the same color, and under the transmitted light, the first ink and the second ink are of the same color. Transparent by image element An image is formed, and the camouflage element and the transmission image element are visually recognized in the same color under reflected light, so that a visible image is visually recognized due to the difference in color. Under the transmitted light, the camouflage element and the information element are visually recognized in the same color. Thus, the transparent latent image printed matter is characterized in that the transparent image can be visually recognized due to the difference in color.

  Further, the transparent latent image printed matter of the present invention is characterized in that the area ratio per unit area in a predetermined range is smaller for the information element and the transmission image element than for the camouflage element.

  In addition, the information element and the transmission image element in the transparent latent image printed matter of the present invention are arranged in a camouflage element by hair removal.

Further, the information element, the transmission image element, and the camouflage element in the transparent latent image printed matter of the present invention are formed by image lines regularly arranged at a first pitch in the first direction.

In addition, the information element, the transmission image element, and the camouflage element in the transparent latent image printed matter of the present invention have the first pitch in the first direction and the second pitch in the second direction different from the first direction. It is formed by regularly arranged pixels.

  Moreover, the 1st ink and the 3rd ink in the transmission latent image printed matter of this invention contain titanium dioxide, It is characterized by the above-mentioned.

  Moreover, the 1st ink in the transmission latent image printed matter of this invention is characterized by having a chroma higher than a 2nd ink and a 3rd ink.

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

  The transmission latent image printed matter of the present invention has three inks in which the second ink and the third ink are the same color under reflected light, and the first ink and the second ink are changed to the same color under the transmitted light. Consists of. This ink cannot be produced simply by blending the same amount of the same pigment as a paired 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 transparent latent image printed material of the present invention is formed by two different colors, unlike the printed pattern of the prior art. For this reason, the color of the printed pattern is not limited to a monotone tone as in the prior art, but can be configured with a plurality of different colors, and a much richer expression is possible compared to the prior art. In addition, since the color density does not need to be extremely light, a highly visible printed pattern can be formed. In addition, since the pair ink has a reflection density comparable to that of a general color ink, it can be used in a print area other than the print image of the present invention in the security print.

  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. Furthermore, since it can authenticate only by seeing through without using a special tool, it is excellent in discrimination.

The transmission latent image printed matter of 1st embodiment in 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 printing pattern of the transmission latent image printed matter in 1st embodiment is shown. The specific structure of the reverse visible image of the transmission latent image printed matter in 1st embodiment is shown. The specific structure of the camouflage image of the transmission latent image printed matter in 1st embodiment is shown. The visual recognition state of the transmission latent image printed matter in 1st embodiment is shown. The transmission latent image printed matter of 2nd embodiment in 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 concrete structure of the printing pattern of the transmission latent image printed matter in 2nd embodiment is shown. The specific structure of the reverse visible image of the transmission latent image printed matter in 2nd embodiment is shown. The concrete structure of the camouflage image of the transmission latent image printed matter in 2nd embodiment is shown. Another aspect of 2nd embodiment is shown. The visual recognition state of the transmission latent image printed matter in 2nd embodiment of this invention is shown. The transmission latent image printed matter in the Example of this invention is shown. An example of the outline | summary of a structure of the transmission latent image printed matter of an Example is shown. The specific structure of the printing pattern of the transmission latent image printed matter of an Example is shown. The specific structure of the reverse visible image of the transmission latent image printed matter of an Example is shown. The concrete structure of the camouflage image of the transmission latent image printed matter of an Example is shown. The visual recognition state of the transmission latent image printed matter in the Example of this invention is shown.

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

(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). The plurality of colors constituting the printed pattern (3) may be any color as long as the chromatic colors are different from those of the substrate (2).

The printed pattern (3) is composed of three inks having different characteristics. The three inks are the first ink, the second ink, and the third ink. The first ink, the second ink, and the third ink are all chromatic colors, and under reflected light, the hue of the ink is the same, and the second ink and the third ink have the same color. Thus, the first ink has higher brightness and saturation than the other two inks, and has a different color. Moreover, although the light transmittance of the three inks is different, specific optical characteristics will be described later.

  FIG. 2 shows an outline of the configuration of the printed pattern (3). The printed pattern (3) has a visible image (4) and a reverse visible image (5) paired therewith. The visible image (4) and the inverted visible image (5) represent the same first significant information, but have a relationship in which the density of the information is inverted. The first significant information in the first embodiment is the letter “A” of the alphabet. The inverted visible image (5) includes a transmission image (6) representing the second significant information and a camouflage image (7). The camouflage image (7) consists of a visible camouflage image (7-1) and a transmission camouflage image (7-2).

  FIG. 3 shows an enlarged view of a part of the visible image (4) and the reverse image (5). In the visible image (4), the information element (4A) having a specific line width (W1) made of the first ink is continuously arranged at the first pitch (P1) in the first direction (direction S1 in the figure). It is constituted by being arranged. One inverted visible image (5) has an inverted visible image element (5A) having a specific line width (W2) made of the second ink and the third ink in the first direction (the direction S1 in the figure). ) Are continuously arranged at the first pitch (P1).

  Next, FIG. 4 shows a specific configuration of the inverted visible image (5). The reverse visible image (5) consists of a transmission image (6) and a camouflage image (7). In the transmission image (6), the transmission image element (6A) having a specific line width (W3) made of the third ink is continuous at the first pitch (P1) in the first direction (direction S1 in the figure). It is constituted by being arranged. The transmission image (6) represents second significant information different from the first significant information. The second significant information in the first embodiment is the letter “B” of the alphabet. Further, one camouflage image (7) has a first pitch (P1) in which the camouflage element (7A) having a specific image line width (W2) made of the second ink has a first pitch (S1 direction in the figure). ) Are arranged in succession.

  Finally, FIG. 5 shows a specific configuration of the camouflage image (7). The camouflage image (7) includes a visible camouflage image (7-1) and a transmission camouflage image (7-2). The visible camouflage image (7-1) represents the same first significant information as the visible image (4), but the visible image (4) has a relationship in which the density of information is inverted. One transmission camouflage image (7-2) represents the same second significant information as the transmission image (6), but the transmission image (6) has a relationship in which the density of the information is inverted.

In the visible camouflage image (7-1), the visible camouflage image element (7A-1) having a specific line width (W4) made of the second ink is the first in the first direction (the S1 direction in the figure). It is configured by being continuously arranged at a pitch (P1). One of the transmission camouflage images (7-2) includes a transmission camouflage image element (7A-2) having a specific line width (W5) made of the second ink in the first direction (direction S1 in the figure). It is configured by being continuously arranged at one pitch (P1). In the example described in the first embodiment, the visible camouflage image (7-1) has a blank of the same size as the paired information elements (4A), and the printed pattern (3 ), Each information element (4A) has a structure that fits into a blank of the visible camouflage image element (7A-1) that forms a pair. The visible camouflage image element (7A-1) that constitutes the information element (4A) and the camouflage image element (7A) in a so-called tweezers state is arranged.

Also, one transparent camouflage image element (7A-2) also has a blank of the same size as the paired transparent image element (6A). The transparent image element (6A) has a structure that fits into the blank of the paired transparent camouflage image element (7A-2). The above is the outline of the configuration of the latent image printed matter (1) of the present invention.

  Of these images, the visible image (4) is formed with the first ink, the camouflage image (7) is formed with the second ink, and the transmission image (6) is formed with the third ink. Here, since the first ink has higher lightness than the other two inks, that is, has a light color, the alphabet ““ is the first significant information that the printed pattern (3) represents under reflected light. The character “A” is in a state where the character portion is light and the surroundings are dark. In addition, since the colors of the second ink and the third ink are equal under reflected light, the second ink and the third ink cannot be visually distinguished under reflected light.

  In the printed pattern (3) described in the first embodiment, the line width (W4) of the visible camouflage image element (7A-1) is equal to or larger than the line width (W1) of the information element (4A). There must be. This is because when the line width (W4) of the visible camouflage image element (7A-1) is smaller than the line width (W1) of the information element (4A), the information element (4A) is visible under the transmitted light. This is because the element (7A-1) cannot be concealed, and the image change effect that is a feature of the present invention is impaired.

  Similarly, the line width (W5) of the transmissive camouflage image element (7A-2) needs to be equal to or larger than the line width (W3) of the transmissive image element (6A). This is because, when the line width (W5) of the transmissive camouflage image element (7A-2) is smaller than the line width (W3) of the transmissive image element (6A), the transmissive image element (6A) is transmitted under reflected light. This is because the camouflage image element (7A-2) cannot be concealed, and the image change effect that is a feature of the present invention is impaired.

  In the first embodiment, the information element (4A) and the transmission image element (6A) are arranged so as to fit in the blanks of the respective camouflage elements (7A-1, 7A-2), so-called tweezers. The arrangement of the tweezers is not necessarily required, and the visible camouflage image element (7A) is more than the area ratio per unit area of the information element (4A) within a predetermined range including the relation of the above-mentioned line width. If the area ratio per unit area of the transmission camouflage image element (7A-2) is larger than the area ratio per unit area of the transmission image element (6A) Alternatively, the respective elements may be arranged at close positions.

In the first embodiment, all of the information element (6), the background element (7A), and the latent image element (7B) are composed of lines, but each element is not limited to a line. It may be formed of pixels, or may be configured by a combination of an image line and pixels. In the second embodiment, an example in which each element is composed of pixels will be described.

The optimum values such as the line widths (W1, W3) of the information element (4A) and the transparent image element (6B) and the line widths (W4, W5) of the two camouflage elements are the first ink and the second ink used. It varies depending on the color and light transmittance of the ink of No. 3 and the third ink. For example, increasing W1 increases the visibility of the first significant information under reflected light, and increasing W3 increases the visibility of the second significant information under the second transmitted light. Of course, since a plurality of elements must be arranged in a limited area, it is necessary to design W3 to be small if W1 is large, and to design W1 to be small if W3 is large. Basically, if the performance of the three inks is sufficient, W1 and W3 are considered to have the same width, and the width of each element is determined according to the visibility of the image prioritized by the user or designer. Adjust it.

  Moreover, there is no technical restriction regarding the value of the pitch P1, but when it is assumed that the printed pattern (3) is applied to a printed matter having a size of about A4, the pitch P1 is 0.01 mm or more and 5 mm or less. It is desirable to do. If each image is configured with a pitch of 0.01 mm or less, printing reproducibility deteriorates and excessively high printing accuracy is required, which is not preferable. If each image is configured with a pitch of 5 mm or more, it is expressed. The reason is that the images that can be produced are not preferred because they are limited to images with very low resolution.

The optical properties of the three inks constituting the latent image printed matter (1) of the present invention will be specifically described below. Of the three inks that make up the printed pattern (3), the second and third inks must have the same color under reflected light, and the first and second inks must be under transmitted light. Must have the same color. That is, the relationship between the colors of the ink needs to change under reflected light and transmitted light, and as a result, the color of each ink needs to change under reflected light and transmitted light.

In order to satisfy such characteristics, it is necessary to control the light transmittance as well as adjusting the colors of the three inks. Of the three inks, the first ink and the third ink need to have low light transmission, and the second ink needs to have high light transmission. Without this characteristic, the relationship between the colors of the three inks under reflected light and transmitted light in the present invention cannot be satisfied. It should be noted that high light transmission and low light transmission referred to in this specification may be relatively higher or lower than the other inks among the three inks. The same applies to lightness and saturation.

When a highly light-transmitting ink having a specific color under reflected light is observed under transmitted light, the brightness is higher than the color visually recognized under reflected light, and the color changes to a bright color. On the other hand, when an ink with low light transmittance is observed under transmitted light, the lightness is lower than the color visually recognized under reflected light, and the color changes to a dark color. In the present invention, the relationship between the colors of the three inks is controlled using the change in color under transmitted light caused by the difference in light transmittance. That is, the first ink having high lightness under reflected light changes to a dark color due to low light transmittance under transmitted light. In addition, the second ink, which was originally low in lightness, changed to a bright color under transmitted light because of its high light transmission, and the third ink, which was also originally low in lightness, had low light transmission, It changes to dark color.

Here, if the colors of the first ink and the second ink under reflected light have appropriate brightness, the first ink changed to a dark color and the second ink changed to a bright color. Inks can be of equal color. In addition, the second ink and the third ink, which had the same color relationship under reflected light, differed in their light transmission properties. It changes to dark colors and becomes an unequal color relationship. As described above, by controlling the color and light transmittance of the three inks, the second ink and the third ink are the same color among the three inks under reflected light, and under the transmitted light. Of the three inks, the first ink and the second ink can be of the same color.

In addition, the brightness 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 high and the lightness of the second ink and the third ink is low” is to satisfy the relative relationship as described above. The difference between the first ink, the second ink, and the third ink L ^* a ^* b ^* color value L ^* of the color system needs to be different from the lightness difference ΔL = 5 or more, Further, it is more preferable that the difference is 10 or more.

In addition, the colors of the first ink, the second ink, and the third ink are not the same color but the two colors are not the same color. The colors need to be different to the extent. Specifically, the color difference ΔE in the L ^* a ^* b ^* color system needs to be different by 6 or more, and the color difference ΔE is more preferably 12 or more.

Further, the first ink and the third ink need to have low light transmittance. This is an essential characteristic for producing the effect under the transmitted light of the present invention. In order to easily satisfy this characteristic, high light blocking properties may be imparted to the first ink and the third ink. 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, since the second ink only needs to have higher light transmittance than the other two inks, a general coloring pigment or coloring dye may be used. When it is desired to further emphasize 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 above-described prior art. Such an ink is hereinafter referred to as “colored penetrating ink”, which will be described later.

  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 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 is almost zero under transmitted light. be able to.

In addition, not only lightness but also saturation changes under transmitted light. Under transmitted light, the saturation of the camouflage image (7) formed with the second ink is relatively increased, while the visible image (4) formed with the first ink and the third ink are formed. The saturation of the transmitted image (6) decreases. For this reason, if the saturation of the camouflage image (7) under reflected light is designed to be low and the saturation of the visible image (4) and the transmission image (6) is designed to be high, the relationship between the colors can be easily satisfied. 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, 6, 7) 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 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.

  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 camouflage image (7) formed with the second ink and the transmission image formed with the third ink. Since (6) is the same color, the transmission image (6) is hidden in the camouflage image (7) and is invisible. The visible image (4) formed with one first ink has a brighter color than the camouflage image (7) formed with the second ink and the transmitted image (6) formed with the third ink. Therefore, the letter “A” of the alphabet, which is the first significant information represented by the visible image (4), can be visually recognized by the difference in the color of the ink constituting the image. In this case, the letter “A” of the alphabet is visually recognized as a light color that is the color of the first ink, and the other peripheral regions are visually recognized as a dark color that is the color of the second ink and the third ink.

  Further, as shown in FIG. 6B, when the transmission latent image print (1) was observed under transmitted light, it was formed with the visible image (4) formed with the first ink and the second ink. Since the camouflage image (7) is visually recognized as the same color, the first significant information becomes invisible, and instead, the transmission image (6) formed with the third ink that is visually recognized as an unequal color with any ink. The second significant information to be represented is visually recognized. In this case, the letter “B” in the alphabet is a dark color that is the color under the transmitted light of the third ink, and the other peripheral regions are the colors under the transmitted light of the first ink and the second ink. It is visually recognized with a bright color.

  As described above, in the transmission latent image printed matter (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 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 the area under transmitted light and the printed latent image (1) is observed. ing.

  The “colored penetrating ink”, which is the most effective as the functional ink that can be used for the second ink, will be described below. 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 inks include “Best One Watermark Ink from T & K TOKA”, “Unimark from Teikoku Ink”, “SMX Water Ink from Toyo Ink”, and “E2 Varnish from Joint Ink”. The colored penetrating ink of the present invention can also be produced using these inks.

  When a metal pigment with high light blocking properties is used for the first ink and the third ink and a colored penetrating ink is used for the second ink, the light transmittance of the camouflage image (7) formed by the second ink The visible image (4) and the transmitted image (6) formed with the first ink and the third ink are lower in light transmittance, so the lightness and saturation of each ink under reflected light The difference can be increased. That is, the lightness and saturation of the second ink and the third ink are lower, and the lightness and saturation of the first ink are higher, so that the color difference between the first ink and the other two inks is reduced. Can be bigger. In this case, the dissimilarity between the visible image (4) and the inverted visible 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.

  In addition, fluorescent pigments, fluorescent dyes, phosphorescence are used for the purpose of ascertaining the occurrence of reprinting and printing defects in the first ink, the second ink, and the third ink, or for the purpose of improving authenticity discrimination. There is no problem even if functional materials such as luminescent pigments such as pigments and phosphorescent 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, each element is configured by a drawing line, but may be formed by a pixel. The specific method will be described below as a second embodiment.

'
(Second embodiment)
FIG. 7 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 ′). Since the characteristics required for the base material (2 ′) are the same as those in the first embodiment, the description thereof is omitted.

  FIG. 8 shows an outline of the configuration of the printed pattern (3 '). In the second embodiment, the printed pattern (3 ') is composed of pixels. It has a visible image (4 ') and a reverse visible image (5') paired therewith. The visible image (4 ') and the inverted visible image (5') represent the same first significant information, but have a relationship in which the density of the information is inverted. The first significant information in the second embodiment is the letter “A” of the alphabet. The inverted visible image (5 ') has a transmission image (6') representing the second significant information and a camouflage image (7 '). The camouflage image (7 ') has a visible camouflage image (7-1') and a transmission camouflage image (7-2 ').

  FIG. 9 shows an enlarged view of a part of the visible image (4 ′) and the reverse image (5 ′). The visible image (4 ′) has a pixel-shaped information element (4A ′) having a specific length (L1) and height (H1) made of the first ink in the first direction (S1 direction in the figure). ) At the first pitch (P1) and continuously arranged at the second pitch (P2) in the second direction (direction S2 in the drawing).

  Next, FIG. 10 shows a specific configuration of the inverted visible image (5 ′). The inverted visible image (5 ') consists of a transmission image (6') and a camouflage image (7 '). The transmission image (6 ′) includes a transmission image element (6A ′) having a specific length (L2) and height (H2) made of the third ink in the first direction (the S1 direction in the drawing). The pitch (P1) is continuously arranged in the second direction (S2 direction in the figure) at the second pitch (P2). The transmission image (6 ') represents second significant information different from the first significant information. The second significant information in the second embodiment is the letter “B” of the alphabet.

  Finally, FIG. 11 shows a specific configuration of the camouflage image (7 '). The camouflage image (7 ') is composed of a visible camouflage image (7-1') and a transmission camouflage image (7-2 '). The visible camouflage image (7-1 ′) has a specific length (L3) and height (H3) of visible camouflage image elements (7A-1 ′) made of the second ink in the first direction (in the figure). The first pitch (P1) in the S1 direction and the second pitch (P2) in the second direction (S2 direction in the figure) are continuously arranged. One transmission camouflage image (7-2) has a specific length (L4) and height (H4) of transmission camouflage image elements (7A-2 ′) made of the second ink in the first direction (FIG. The first pitch (P1) in the middle S1 direction and the second pitch (P2) in the second direction (S2 direction in the figure) are continuously arranged.

In the first embodiment, the visible camouflage image (7-1) has a blank of the same size as the paired information elements (4A), and when the printed pattern (3) is configured, Each information element (4A) has a structure that fits in a blank space of a pair of visible camouflage image elements (7A-1). In the second embodiment, each element is located at a different location. It is arranged. That is, in constructing the transmission latent image printed matter (1 ′) of the present invention, each element may be arranged at a position where they do not overlap each other. Like the arrangement described in the first embodiment, Either the form in which the elements are arranged by fitting in the blanks of the elements or the form in which the respective elements are arranged in different places, such as the arrangement described in the second embodiment, It may be used. The above is the outline of the configuration of the latent image printed matter (1 ') of the present invention.

  In FIG. 12, in the second embodiment, even when each element is formed of pixels, the information element (4A ′) and the transmission image element (6A ′) are visible as in the first embodiment. It is the figure which showed the structure fitted in the blank of a camouflage image element (7A-1 ') and a transmission camouflage image element (7A-2'). An information element (4A ') and a transmission image element (6A') are arranged in a visible camouflage image element (7A-1 ') and a transmission camouflage image element (7A-2'). Even with such a configuration, there is no problem as described above.

  Of these images, the visible image (4 ′) is formed with the first ink, the camouflage image (7 ′) is formed with the second ink, and the transmission image (6 ′) is formed with the third ink. The Since the characteristics required for each ink are the same as those of the first embodiment, description thereof is omitted here.

  The effect of the transparent latent image printed material (1 ') formed with the above configuration will be described with reference to FIG. As shown in FIG. 13A, when the transmission latent image printed matter (1 ′) was observed under reflected light, it was formed with the camouflage image (7 ′) formed with the second ink and the third ink. Since the transmission image (6 ′) is the same color, the transmission image (6 ′) is hidden in the camouflage image (7 ′) and is invisible. The visible image (4 ′) formed with one first ink is brighter than the camouflage image (7 ′) formed with the second ink and the transmitted image (6 ′) formed with the third ink. Since it has a color, the letter “A” of the alphabet, which is the first significant information represented by the visible image (4 ′), can be visually recognized by the difference in the color of the ink constituting the image. In this case, the letter “A” of the alphabet is visually recognized as a light color that is the color of the first ink, and the other peripheral regions are visually recognized as a dark color that is the color of the second ink and the third ink. .

  As shown in FIG. 13B, when the transmission latent image print (1 ′) is observed under transmitted light, the visible image (4 ′) formed with the first ink and the second ink are formed. Since the camouflaged image (7 ') is visually recognized as the same color, the first significant information becomes invisible, and instead, a transmission image (3) formed with the third ink visually recognized as an unequal color with any ink. The second significant information represented by 6 ′) is visually recognized. In this case, the letter “B” in the alphabet is a dark color that is the color under the transmitted light of the third ink, and the other peripheral regions are the colors under the transmitted light of the first ink and the second ink. It is visually recognized with a bright color.

  As described in the second embodiment, in the transmission latent image printed matter (1 ′) of the present invention, the information represented by the printed pattern (3 ′) is the first significant information under reflected light, Then, it is the second significant information. As described above, the transmission latent image printed material (1 ') of the present invention can be produced even if each element is formed by pixels instead of image lines.

  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 according to the mode for carrying out the invention described above, but the present invention is not limited to this example.

  This embodiment will be described with reference to FIGS. FIG. 14 shows a transmission latent image print (1 ″) in the embodiment. The transmission latent image printed matter (1 ″) is formed by forming a printed pattern (3 ″) having a plurality of green colors (yellowish green and green) on a substrate (2 ″). As the base material (2 ″), general white fine paper (manufactured by Shiraoi Nippon Paper Industries) was used.

  FIG. 15 shows an outline of the configuration of the printed pattern (3 ″). The printed pattern (3 ″) has a visible image (4 ″) and a reverse visible image (5 ″) paired therewith. The visible image (4 ″) and the inverted visible image (5 ″) represent the same first significant information, but have a relationship in which the density of the information is inverted. The first significant information in the present embodiment is “a state of sumo during the game” in a game of birds and beasts. Further, the inverted visible image (5 ″) includes a transmission image (6 ″) representing the second significant information and a camouflage image (7 ″). The second significant information in the present embodiment is “a state of sumo with a match” in a game of birds and beasts. The camouflage image (7 ″) has a visible camouflage image (7-1 ″) and a transmission camouflage image (7-2 ″). The visible image (4 ″) is formed with the first ink having a bright color, and the inverted visible image (5 ″) is formed with the second ink and the third ink having a dark color. If the visible image (4 ″) with the darkness and darkness is formed, the lightness and darkness of the first significant information appearing in the printed pattern (3 ″) is reversed from the lightness and darkness of the actual original image. For this reason, an image obtained by reversing the density of the original image in advance is used as a visible image (4 ″), and an image having the same density as the original image is used as the inverted visible image (5 ″).

  FIG. 16 is an enlarged view of a part of the visible image (4 ″) and the reverse image (5 ″). In the visible image (4 ″), an information element (4A ″) composed of the first ink and having a line width of 0.2 mm is continuously arranged at a pitch of 0.6 mm in the first direction (direction S1 in the drawing). Arranged and configured. Also, one inverted visible image (5) has an inverted visible image element (5A) having a line width of 0.5 mm made of the second ink and the third ink in the first direction (S1 direction in the figure). It was configured by arranging continuously at a pitch of 0.6 mm (P1).

  Next, FIG. 17 shows a specific configuration of the inverted visible image (5 ″). The inverted visible image (5 ") has a transmission image (6") and a camouflage image (7 "). In the transmission image (6 ″), a transmission image element (6A ″) composed of a third ink and having a line width of 0.2 mm is continuously arranged at a pitch of 0.6 mm in the first direction (S1 direction in the figure). Arranged and configured. One camouflage image (7 ″) is composed of a second camouflage element (7A ″) having a line width of 0.5 mm and a pitch of 0.6 mm in the first direction (S1 direction in the figure). And arranged continuously.

  Finally, FIG. 18 shows a specific configuration of the camouflage image (7 ″). The camouflage image (7 ″) is composed of a visible camouflage image (7-1 ″) and a transmission camouflage image (7-2 ″). The visible camouflage image (7-1 ″) is obtained by placing a visible camouflage image element (7A-1 ″) made of the second ink and having a line width of 0.25 mm in the first direction (S1 direction in the figure). .. Continuously arranged at a pitch of 6 mm. One of the transmission camouflage images (7-2 ″) is a transmission camouflage image element (7A-2 ″) made of the second ink and having a line width of 0.25 mm in the first direction (direction S1 in the figure). And continuously arranged at a pitch of 0.6 mm (P1). Each of the visible camouflage images (7-1 ″) has a blank of the same size as the paired information elements (4A ″). The information element (4A ″) of FIG. 4 is configured to fit in the blank space of the pair of visible camouflage image elements (7A-1 ″). Also, one transparent camouflage image element (7A-2 ″) has a blank of the same size as the paired transparent image element (6A ″), and a printed pattern (3 ″) is provided. In the configuration, each transparent image element (6A ″) has a structure that fits into a blank space of a pair of transparent camouflage image elements (7A-2 ″).

  Of these images, the visible image (4 ″) is formed with the first ink (Best One Panton 380, pale green T & K TOKA), and the camouflage image (7 ″) is the colored penetrating ink shown in Table 1. It was formed with a certain second ink, and the transmission image (6 ″) was formed with the third ink shown in Table 2. Each ink has a green hue, the first ink is light yellow-green, and the second and third inks are slightly dark green. The first ink and the third ink contain 40% or more of titanium white and have excellent light blocking properties. The second ink and the third ink were each finished with the same color under reflected light by adding a small amount of a coloring pigment. Each ink was printed by an offset printing method to obtain a transmission latent image print (1 ″) of the present invention.

  In this example, under reflected light, the first ink had greater brightness and saturation than the other two inks, and the color difference ΔE was 20 or more apart. Further, ΔE of the second ink and the third ink was about 3, which was almost the same color. The light transmittance of the second ink was higher than that of the first ink and the third ink.

  The effect of the transmission latent image printed material (1 ″) produced with the above configuration will be described below with reference to FIG. As shown in FIG. 19 (a), when the transmission latent image printed matter (1 ″) is observed under reflected light, the observer (9 ″) has a visible image (4 ″) of yellowish green, The reverse visible image (5 ″) is recognized in green, and the “significant sumo during the game” image is slightly dark green in the bird and beast caricature, which is the first significant information expressed by the color difference. The area of was visible with a color between yellow-green and green. At this time, the latent image (6 ″) was invisible.

  Further, as shown in FIG. 19B, when the transmission latent image printed matter (1 ″) is observed under transmitted light, the viewer (9 ″) has a visible image (4 ″) and a camouflage image. The color of (7 ″) looks the same green color, and as a result, the latent image (6 ″) expressed in the third ink is the second significant information that appears in the bird and beast caricature. The “appearance” was dark dark green, and the other areas were visible in green.

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

1, 1 ′, 1 ″ transmission latent image print 2, 2 ′, 2 ″ base material 3, 3 ′, 3 ″ printed pattern 4, 4 ′, 4 ″ visible image 4A, 4A ′, 4A ″ Information element 5, 5 ', 5 "Inverted visible image 5A, 5A', 5A" Inverted visible image element 6, 6 ', 6 "Transparent image 6A, 6A', 6A" Transparent image element 7, 7 ' 7 ″ camouflage images 7A, 7A ′, 7A ″ camouflage elements 7-1, 7-1 ′, 7-1 visible camouflage images 7A-1, 7A-1 ′, 7A-1 visible camouflage image elements 7-2 7-2 ′, 7-2 Transmitted camouflage images 7A-2, 7A-2 ′, 7A-2 Transmitted camouflage image elements 8, 8 ′, 8 ″ Light source 9, 9 ′, 9 ″ Viewpoint of the observer

Claims (8)

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 element formed by a chromatic first ink, and a camouflage element formed by a second ink having characteristics of lower lightness and higher light transmittance than the first ink, A plurality of transmission image elements formed by the third ink having the same lightness as the second ink and having a light transmission property lower than that of the second ink are arranged so as not to overlap each other.
The hues of the first ink, the second ink, and the third ink are equal, the second ink and the third ink are the same color under reflected light, and the first ink under transmitted light. And the second ink are the same color,
A visible image is formed by a plurality of the information elements, a transmission image is formed by a plurality of the transmission image elements,
Under the reflected light, the camouflage element and the transmitted image element are visually recognized as the same color, so that the visible image is visually recognized due to a difference in color, and under the transmitted light, the camouflage element and the information element are visually recognized as the same color. Thus, the transparent latent image printed matter is characterized in that the transparent image can be visually recognized due to a difference in color. 2. The transmission latent image printed matter according to claim 1, wherein an area ratio per unit area in a predetermined range is smaller in the information element and the transmission image element than the camouflage element. 3. The transmission latent image printed matter according to claim 2, wherein the information element and the transmission image element are arranged in the camouflage element by tweezers. 4. The transmission latent image according to claim 3, wherein the information element, the transmission image element, and the camouflage element are formed by image lines regularly arranged at a first pitch in a first direction. Printed matter. The information element, the transmission image element, and the camouflage element are regularly arranged at a first pitch in a first direction and at a second pitch in a second direction different from the first direction. The transmission latent image printed matter according to claim 3, wherein the printed latent image print product is formed of pixels. The transmissive pattern printed matter according to any one of claims 1 to 5, wherein the first ink and the third ink contain titanium dioxide. The transmissive pattern printed matter according to any one of claims 1 to 6, wherein the first ink has higher saturation than the second ink and the third ink. The transmissive pattern printed matter according to claim 1, wherein the transmissive image is formed by a difference in area ratio in the camouflage image.

Images