JP2012121219A - Latent image printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latent image printed matter of which the image observable under ordinary visible light is changed into a completely different image and the color thereof is also changed upon observation under specified conditions, in the field of precious printed matters such as bank notes, passports, securities, identifications, cards and traffic tickets being security printed matters requiring duplication prevention measures and forgery prevention measures.SOLUTION: The first image is formed by arranging a first information part formed by coloring ink in a first background part formed of a latent element group formed by permeable ink and a camouflage element group formed by the coloring ink and on the first image a second image is formed of a second information part and a second background part formed by pearl ink, and thus the latent image printed matter having an effect that the images are changed into different images having no correlation at all when visually recognized under diffusely-reflected light when visually recognized under regularly reflected light, and when visually recognized under transmitted light is provided.

Description

  The present invention is observed under ordinary visible light in the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matter that requires measures to prevent duplication and counterfeiting. The resulting image changes to a completely different image when observed under specific conditions, and relates to a latent image printed matter whose color also changes.

  With recent developments in digital devices such as scanners, printers, and color copiers, it has become possible to easily produce sophisticated copies of security prints. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeit technologies that cannot be reproduced by copying, such as squeezing and holograms, are required.

  As one of these anti-counterfeiting technologies, a clear ink is used for translucent paper as an example of the technology for forming the scratch by printing, apart from the scratching technology formed at the stage of manufacturing the paper. There is disclosed a watermarked paper characterized by a printed watermark pattern (see, for example, Patent Document 1).

  In addition, many anti-counterfeiting techniques have affixed an optical security element represented by a hologram whose image changes depending on the observation angle. However, forgery-preventing printed materials such as holograms that exhibit optical changes have a complicated manufacturing method, and there is a problem that the cost is increased unless large quantities are ordered. Therefore, the present applicant forms a swelled image line using a plane-oriented pearl pigment, and has a configuration in which the wiring angle is different between the background image portion and the message image portion, and only when observed obliquely, An application has been filed for an invention relating to a printed matter capable of authenticating whether the message image portion changes from positive to negative or from negative to positive (for example, see Patent Document 2 and Patent Document 3).

Japanese Patent Laid-Open No. 10-236000 Japanese Patent No. 3718712 JP 2010-173161 A

  However, the technique of Patent Document 1 is a configuration in which a latent image can be visually recognized only when observed under transmitted light. The techniques of Patent Documents 2 and 3 are latent only when observed under specularly reflected light. It is the structure which can visually recognize an image. Therefore, these images can be viewed visually under one specific condition (under specular reflection or transmitted light) that is different from that under diffuse reflection, based on images observed under diffuse reflection. Technology. However, in other words, there is a problem that the authenticity determination can be performed only under one specific condition, and the authenticity determination is limited to a specific scene. These are problems to be solved in view of the nature of the security printed material that needs to be authenticated in various environments and situations.

  Further, in the techniques of Patent Documents 2 and 3, the act of determining authenticity with specularly reflected light can be performed with a small operation that is invisible to the human eye such that the printed material is slightly inclined with respect to the illumination. However, on the other hand, authenticity determination performed by specularly reflected light as in these techniques is generally very strongly influenced by the incident direction of light existing in the observation environment and the amount of light, so that authenticity is always maintained. It is hard to say that it is expensive. For example, if there is a large window in the authentication environment, the view is different between daytime and night.

  Conversely, the watermark technique formed by the technique described in Patent Document 1 uses transmitted light for authenticity determination. The authenticity determination method using transmitted light is a highly authentic authenticity determination method when there is a certain amount of light in the environment, but the act of seeing through the printed material often involves a conspicuous action. . Truth discrimination in face-to-face sales needs to be done quickly while the customer is present. For example, in the cash register at a supermarket or convenience store, the act of seeing through the money given by the customer must be done in front of the customer. Is thought to be rude in the current Japanese sense and is not an easy action. It is thought that there are not a few examples of receiving a counterfeit ticket that would otherwise have been removed without receiving it because it was not transparent.

  As described above, there is a problem with each of the technologies that can determine the authenticity only under one specific situation such as under specular reflection light or transmission light. Therefore, in order to solve the problem, it is possible to supplement each problem by simply forming both the techniques of Patent Document 1 and Patent Document 2 in one security print. However, in that case, a load on the printing process due to an increase in the number of colors to be printed and an increase in cost due to an increase in the printing area, etc., resulting in another problem that greatly affects the printing process. .

  For this reason, an environment in which a latent image can be visually recognized under a plurality of conditions and at the same time an authenticity determination is not limited, and further, a technique that places less burden on the printing process has been desired. In addition, as in the past, there is a demand for production by a highly productive printing method, and at the same time, a technique that makes it impossible to easily produce a duplicate using the latest digital equipment.

  The present invention is intended to solve the above-described problems. Even though the printed image is formed in one area, the image in the area is viewed under diffuse reflection light and specular reflection light. The printed matter has an effect of changing to a different image having no correlation when viewed underneath and when viewed under transmitted light. The present invention also relates to a printed matter that cannot be duplicated even with the latest digital equipment and that can be formed by printing without requiring a complicated manufacturing process such as a hologram.

  In the latent image printed material according to the present invention, a printed image having a color different from that of the substrate is formed on at least a part of the substrate having transparency, and the printed image is a second image on the first image. The first image is composed of a first information part and a first background part, and the first information part is composed of a second ink, The first background portion is formed of a first ink different from the second ink, and the latent image elements are regularly arranged at a constant pitch. A plurality of latent image elements arranged regularly in the same direction as the first direction and a camouflage element formed of the second ink are regularly arranged in the same direction as the first direction at a constant pitch. And a plurality of camouflage element groups arranged in the latent image element group and camouflage element Is the same color under diffuse reflected light, the first information element, the latent image element and the camouflage element are arranged without overlapping each other, the second image is the second information part, The second information portion is formed of a first ink and a third ink different from the second ink. A plurality of second background parts are arranged with a pitch, and a plurality of background lines having a bulge formed with a third ink are arranged at a constant pitch in a third direction different from the second direction. The area ratio of the second information portion and the second background portion is substantially the same, and the first ink is a penetrating ink containing a penetrating component that changes the transmittance of the base material. The second ink is a colored ink having the same hue as the first ink, and the third ink. Ki is a pearl ink containing a pearl pigment. When observed under diffuse reflected light, the first information section is predominantly visually recognized, and when observed under transmitted light, the latent image element group is predominant. When viewed under regular reflection light, the second information unit is mainly viewed.

  The latent image printed material according to the present invention is characterized in that the latent image element, the camouflage element, and the first information element are at least one of an image line and a pixel, or a combination thereof.

  The latent image printed material according to the present invention is characterized in that the first direction and the second direction, and the first direction and the third direction are different directions.

  The latent image printed material according to the present invention is characterized in that the height of the information image line and the background image line having a bulge is 5 μm or more.

  The latent image printed material according to the present invention is characterized in that the area ratio of the second information portion and the area ratio of the second background portion are 50% or more.

  The latent image printed material according to the present invention is characterized in that the angle difference between the second direction and the third direction is 10 degrees or more.

  The latent image printed material according to the present invention is characterized in that the pearl pigment contained in the third ink is leafed on the surface of the ink film having the swelling.

  In the latent image printed matter of the present invention, the first meaningful information can be visually recognized under normal observation conditions (under diffuse reflected light), the second meaningful information can be visually recognized under transmitted light, and the third meaningful information can be viewed under regular reflected light. Can be visually recognized, and it can be visually recognized that the color changes simultaneously according to each observation condition. Therefore, it is possible to determine authenticity by confirming latent images and colors under a plurality of different conditions using a single print image, and the images and colors that can be observed under each condition are completely different. In addition, reproducing the effect of changing to different images and colors one after another under a plurality of different conditions by imitating it in one printed image imitates the technology in which a latent image appears under one condition. Since the difficulty level is dramatically increased, the counterfeit resistance is more excellent.

  When using the latent image printed material of the present invention as a security printed material such as banknotes, gift certificates, tickets, etc., it is possible to determine the authenticity in a plurality of different observation environments. It is not just an additive effect that is possible. In the situation where face-to-face sales are performed, it is possible to provide a mechanism for authenticity determination that can be performed promptly, surely, and without hesitation. Examples are described below.

  For example, when the authenticity of a latent image printed material according to the present invention is determined at a cash register such as a convenience store or a supermarket, the latent image printed material handed over by a customer is first viewed to confirm whether the first meaningful information can be read. If the first meaningful information can be read accurately and the image itself does not feel uncomfortable, then the latent image printed material is slightly tilted and specularly reflected, and the first meaningful information becomes the second meaningful information. Confirm whether or not to change. Since this operation is an extremely small operation, it is not known from the customer side whether the authenticity determination is performed. If it is an authentic product, the second meaningful information can be visually recognized at this stage, so no further checks are necessary.

  However, in this state, the second meaningful information cannot be visually recognized or the image is unclear, and only when there is a suspicion, this is the most reliable method of authenticating the authenticity of the latent image printed matter. It is.

  This latent image printed material not only supplements each weak point of the authenticity determination method using specular reflection light and transmitted light with one element, but also provides more effective authenticity determination. Therefore, it is possible to perform more natural and reliable authenticity determination, and it is possible to provide a situation in which counterfeit products can be more easily excluded than in the past.

  The latent image printed matter formed by the above method is excellent in cost performance because it can be manufactured by a combination of offset printing and flexographic printing or a combination of offset printing and screen printing.

The latent image printed matter in this invention is shown. (A) shows a printed image in the present invention, (b) shows a first image, and (c) shows a second image. (A) shows the 1st image in this invention, (b) shows a 1st information part, (c) shows a 1st background part. (A) shows the 1st background part in this invention, (b) shows a latent image element group, (c) shows a camouflage element group. (A) shows the 1st image in this invention, (b) shows the image (latent image element group) formed using 1st ink, (c) uses 2nd ink. An image (a first information part and a camouflage element group) formed is shown. An example of the structure of the latent image element group in this invention is shown. (A) shows the image formed with a 2nd ink, (b) shows an example of the structure of a camouflage element group, (c) shows an example of the structure of a 1st information part. (A) shows the 2nd image in this invention, (b) shows an example of a structure of a 2nd information part, (c) shows an example of a structure of a 2nd background part. The enlarged view of the 2nd information line in the present invention and the 2nd background line is shown. The effect of the latent image printed matter in the present invention is shown, (a) shows an image visually recognized when observed under diffuse reflected light, and (b) is an image visually recognized when observed under regular reflected light. (C) shows the image visually recognized when observed under transmitted light. (A) shows an example of a configuration when an image (latent image element group) formed using the first ink is formed of pixels, and (b) is formed using the second ink. An example of a structure in case the image (1st information part and camouflage element group) is formed with the pixel is shown. In each element, at least one of an image line and a pixel or a combination thereof is shown. (A) shows an example of the structure of the image (latent image element group) formed using the first ink, and (b) shows the image (first information portion and the image formed using the second ink). An example of a structure of a camouflage element group) is shown. The latent image printed matter in Example 1 is shown. 2 shows images for each ink contained in the latent image printed matter in Example 1, (a) is a latent image element group formed with the first ink, and (b) is a camouflage element group formed with the second ink. The first information part, (c), shows a second image formed with the third ink. 2 shows a latent image element group in Example 1. FIG. The image formed with the 2nd ink in Example 1 is shown. The 2nd image in Example 1 is shown. The effect of the latent image printed matter in Example 1 is shown, (a) shows the image visually recognized when observed under diffuse reflected light, and (b) is visually recognized when observed under regular reflected light. An image is shown, (c) shows the image visually recognized when observed under transmitted light. The latent image printed matter in Example 2 is shown. The image according to ink contained in the latent image printed matter in Example 2 is shown, (a) is a latent image element group formed with the first ink, (b) is a camouflage element group formed with the second ink, The first information part, (c), shows a second image formed with the third ink. 9 shows a latent image element group in Example 2. FIG. The image formed with the 2nd ink in Example 2 is shown. The 2nd image in Example 2 is shown. The effect of the latent image printed matter in Example 2 is shown, (a) shows the image visually recognized when observed under diffuse reflected light, and (b) is visually recognized when observed under regular reflected light. An image is shown, (c) shows the image visually recognized when observed under transmitted light. The latent image printed matter in Example 3 is shown. The image according to ink contained in the latent image printed matter in Example 3 is shown, (a) is a latent image element group formed with the first ink, (b) is a camouflage element group formed with the second ink, The first information part, (c), shows a second image formed with the third ink. 10 shows a latent image element group in Example 3. FIG. The image formed with the 2nd ink in Example 3 is shown. The 2nd image in Example 3 is shown. The effect of the latent image printed matter in Example 3 is shown, (a) shows the image visually recognized when observed under diffuse reflected light, and (b) is visually recognized when observed under regular reflected light. An image is shown, (c) shows the image visually recognized when observed under transmitted light.

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

  FIG. 1 shows a latent image printed material (1) according to the present invention. In the latent image printed matter (1), a printed image (3) having a color different from that of the substrate is formed on at least a part of the substrate (2). For convenience of explanation, the characters “A”, “B”, and “C” are represented in the print image (3) in FIG. In the observation under the light), the letter “A” is visible, and the letters “B” and “C” are not visible. Although the effect will be described later, the letter “B” can be visually recognized in observation under transmitted light, and the letter “C” can be visually recognized in observation under specular reflection light.

  In the present invention, “observation under diffuse reflected light” refers to a situation where the observer's viewpoint is in an area where there is almost no specularly reflected light and the latent image printed matter (1) is being observed. In the present invention, “observation under specular reflection light” refers to a situation where the observer's viewpoint is in the region where the specular reflection light is generated and the latent image printed matter (1) is being observed. In the present invention, “observation under transmitted light” refers to a situation in which the observer's viewpoint is in the above-described region under transmitted light and the latent image printed matter (1) is observed. .

  FIG. 2 shows the configuration of the print image (3). The print image (3) shown in FIG. 2 (a) has a first image (4) shown in FIG. 2 (b) and a second image (5) shown in FIG. 2 (c).

  FIG. 3 shows the configuration of the first image (4). The first image (4) shown in FIG. 3 (a) includes a first information part (6) shown in FIG. 3 (b) and a first background part (7) shown in FIG. 3 (c). It is configured. The first information section (6) represents first meaningful information such as letters, numbers, symbols, etc., and is visualized only under diffuse reflection light. The first meaningful information in the embodiment is the letter “A” of the alphabet. The first background portion (7) is configured with a certain gradation. By overlapping the region forming the first information part (6) and the region forming the first background part (7), the area ratio of the overlapping region is higher than the area ratio of the other regions. As a result, the first image (4) is visually recognized due to the difference in area ratio.

  The first information part (6) and the first background part (7) are composed of lines and / or pixels, but the detailed line structure and pixel structure will be described later. In addition, the area | region which forms the 1st information part (6) mentioned above and the area | region which forms the 1st background part (7) mean the area | regions to the last, respectively, It does not mean that the image lines and / or pixels constituting the image overlap each other.

  FIG. 4 shows the configuration of the first background portion (7). The first background portion (a) shown in FIG. 4 (a) is composed of a latent image element group (8) shown in FIG. 4 (b) and a camouflage element group (9) shown in FIG. 4 (c). ing. The latent image element group (8) represents second meaningful information such as letters, numbers, and symbols, and is visualized only under transmitted light. The second meaningful information in the embodiment is the letter “B” of the alphabet. The camouflage element group (9) is an image obtained by negatively positive-inverting the latent image element group (8), which is the second meaningful image, in the first background portion (7). It has a function of hiding in the first background portion (7). Therefore, the latent image element group (8) and the camouflage element group (9) must be visually the same color.

  The first image (4) in the latent image print (1) is formed of two types of ink. An image formed by the two types of inks is shown in FIG. FIG. 5A shows the first image (4), FIG. 5B shows an image formed using the first ink, and FIG. 5C shows the second ink. An image to be formed is shown. The image (8) formed using the first ink is the latent image element group (8), and the image formed using the second ink is the first information section (6) and the camouflage element group ( 9).

  Here, the first ink and the second ink will be described. The first ink that forms only the latent image element group (8) needs to be a penetrating ink containing a penetrating component that changes the transmittance of the printed region to a high level when printed on the substrate (2). is there. The second ink is a normal colored ink, and when it is printed on the substrate, it must have the same hue as when the first ink is printed on the substrate (2), but the concentration is different. May be. The reason for this will be described later. In addition, "density" here means the density value when each printed portion is measured with a color densitometer when the first ink and the second ink are printed at the same area ratio. It is.

  The first ink and the second ink need to have colors that are visible when printed on the substrate (2). This is because when there is no color, the printed image (3) becomes invisible under diffuse reflected light, and the first information part (6) cannot be visually recognized.

  In the present invention, “color” represents a color including the concept of hue, saturation, and brightness, and “hue” refers to a color aspect such as red, blue, and yellow. Yes, specifically, the intensity distribution of a specific wavelength in the visible light region (400 to 700 nm) is shown.

  FIG. 6 shows an example of a specific configuration of the latent image element group (8). The latent image element group (8) is formed by regularly arranging a plurality of latent image elements (11) having an element width (W1) at a constant pitch (P1) in the first direction. The “first direction” in the present invention is a direction in the drawing when the latent image element (11) is an image line, and is regularly arranged in a direction orthogonal to the latent image element (11). Yes.

  FIG. 7 shows an example of a specific configuration of the camouflage element group (9) and the first information unit (6). As shown in FIG. 7B, the camouflage element group (9) includes a camouflage element (12) having the same element width (W1) as the latent image element (11), and a constant pitch (P1) in the first direction. It is arranged in a plurality regularly. Moreover, as shown in FIG.7 (c), the 1st information part (6) has the 1st information element (13) of element width (W2) at a fixed pitch (P1) in the 1st direction. It is regularly arranged in multiple numbers.

  The “first direction” in the present invention is a direction in the drawing when the camouflage element (12) and the first information element (13) are drawn, and is regular in the direction orthogonal to each element. Is arranged.

  The first direction in which the first information element (13) is arranged, the first direction in which the latent image element (11) is arranged, and the first direction in which the camouflage element (12) is arranged are: All are in the same direction, and the first information element (13), latent image element (11) and camouflage element (12) are formed without overlapping each other. Although it is possible to produce the latent image printed matter of the present invention even if the first direction is changed for each element, when the printed image (3) is observed under magnified reflection light, Since the latent image element group (8) can be visually recognized from the difference in the direction of the image line, it is not a preferable mode.

  The first ink and the second ink used in the embodiment not only have the same hue, but also have the same color density, are completely the same color, and are visually equal in color. To do. When the first ink and the second ink are the same color, the area ratio of the latent image element group (8) and the area ratio of the camouflage element group (9) need to be the same. The reason is that when the first ink and the second ink are in the same color relationship, in the other element design, the latent image element group (8) and the camouflage element group (9) do not have the same color. This is because the latent image element group (8) cannot be completely hidden when the first background portion (7) is formed by combining two elements.

  In the present invention, “equal color” means that when an observer observes two observing objects having a color at a certain distance (20 cm to 30 cm) apart from each other without taking particular care, It is assumed that two observation objects are not different colors but feel the same color. For example, the color difference ΔE is set to a value of about 3 or less. 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 distribution of the intensity of the wavelength in the visible light region has a correlation in the two colors. is there.

  On the contrary, even if the hues of the first ink and the second ink are the same, if the color density is different, the latent image element group (8) and the camouflage element group (9) according to the difference in color density. It is necessary to change the area ratio. For example, when the first ink is light blue, the second ink is dark blue, and the second ink has twice the color density than the first ink, the latent image element group (8) It is necessary to adjust the pitch of each element and the element width so that the area ratio of becomes a value twice the area ratio of the camouflage element group (9). The “area ratio” in the present invention is the ratio of the printed area in a certain area.

  FIG. 8 shows the configuration of the second image (5). The second image (5) is formed on top of the first image (4). The second image (5) shown in FIG. 8 (a) includes the second information part (14) shown in FIG. 8 (b) and the second information part (14). The second background portion (15) shown in FIG. The second information part (14) represents third meaningful information such as letters, numbers and symbols, and is visualized only under regular reflection light. The third meaningful information in the embodiment is the letter “C” of the alphabet.

  As shown in the partially enlarged views in FIGS. 8B and 8C, the second information portion (14) has the second information image line (16a) having the image line width (W3). The second background portion (15) has a second background image line (16b) having an image line width (W3) in the second direction. Are regularly arranged at a constant pitch (P2) in a third direction different from FIG. Each of the second information image line (16a) and the second background image line (16b) is formed by an image line having a rise.

  FIG. 9 is an enlarged view of the second information image line (16a) and the second background image line (16b). For example, when light is incident from the direction A in the figure, the reflection of the light of the second information image line (16a) having an angle close to parallel to the incident light is small, and the second background image is relatively relative. The reflection of light on the line (16b) is increased. On the contrary, when light is incident from the direction B in the figure, the reflection of the light of the second background image line (16b) having an angle close to parallel to the incident light is small, and the second information is relatively Reflection of the light of the image line (16a) becomes large. Therefore, even if light enters from any direction, a difference in reflected light occurs between the second information image line (16a) and the second background image line (16b). If it is under specular reflection light, the second image (5) is visually recognized with a clear contrast even when viewed from any angle.

  The area ratio of the second information part (14) and the area ratio of the second background part (15) need to be substantially the same. This means that if there is a difference in area ratio, even if the second image (5) is formed with transparent or translucent ink, the image line printed with bulges is completely in a strict sense. Since it does not become transparent, a slight difference in density or transmittance occurs due to a difference in area ratio between the second information portion (14) and the second background portion (15), and the light is transmitted under diffuse reflected light or transmitted. This is because the second image (5) may be visualized even when observed under light. In order to prevent such a situation, it is necessary to make the area ratios of the second information part (14) and the second background part (15) substantially the same.

  Note that “the area ratio is substantially the same” in the present invention is a range in which the difference cannot be easily perceived by an observer visually, and the specific range is the ratio of the area ratio of two images. Suppose that it is in the range of about 95% to 105%.

  In consideration of the visibility of the second image (5), the area ratio of the second information portion (14) and the second background portion (15) is preferably 50% or more. This is because when the area ratio is 50% or less, the pearl effect described later often becomes insufficient, and the visibility of the second image (5) becomes low. The upper limit of the area ratio should not be 100%, but may be a value very close to 100% as long as there is a non-image area.

  The second direction and the third direction are preferably different in angle by at least 10 degrees. This is because when the angle difference is 10 degrees or less, there is no large angle difference between the second information portion (14) and the second background portion (15) with respect to light incident from a certain direction. This is because no strong light contrast occurs and the visibility of the second image (5) is lowered. It should be noted that the strongest light contrast occurs when the angles are different by 90 degrees.

  The “first direction” in which the first information element (13) is arranged, the “first direction” in which the latent image element (11) is arranged, and the “first direction” in which the camouflage element (12) is arranged. As described above, all the “directions of” are the same direction, but the “first direction”, the “second direction” and the second direction in which the second information image line (16a) is arranged. It is desirable that the “third direction” in which the background image line (16b) is not the same direction.

  If the directions are the same, the pitch (P1) of the latent image element (11-3), the camouflage element (12) and the first information element (13) in the first image (4) and the second It is desirable to appropriately determine the pitch (P2) of the second information image line (16a) and the second background image line (16b) in the image (5). The purpose of this is to suppress moiré caused by interference between each element forming the first image (4) and the image line forming the second image (5). Is. Due to the occurrence of moiré, the latent image may be visually recognized under conditions that should not appear. In order to conceal the existence of each latent image as much as possible, It is desirable to devise measures that do not cause interference in the elements.

  In addition, the second information image line (16a) and the second background image line (16b) that form the second image (5) need to have a bulge. If the height is 5 μm or more, the second image (5) is visualized under specular reflection light. The line height is difficult to form by general offset printing, but can be easily formed by using flexographic printing, gravure printing, screen printing, intaglio printing, or the like. The upper limit of the height of the swell is not particularly limited from the technical point of view, but it is desirable that it does not exceed 30 μm in consideration of distribution suitability, durability, loadability, etc. in the market as printed matter.

  The second image (5) is formed using the third ink. The third ink is formed of an ink containing a pearl pigment that is transparent or translucent under diffuse reflection light and generates a specific interference color under regular reflection light (hereinafter referred to as “pearl ink”). Pearl ink is transparent or translucent under diffuse reflection light, but emits a specific color interference color under regular reflection light, and when observed with transmitted light, a complementary color of the interference color is observed. Has characteristics.

  For example, a pearl ink that emits a red interference color is visually recognized as green when observed under transmitted light, and a pearl ink that emits a yellow interference color is visually recognized as blue when observed under transmitted light. In addition to pigments that emit only a single interference color during regular reflection, pearl pigments include pigments that change in hue with changes in the angle of incident light. Any type may be used for formation.

  In the present invention, the term “transparent or translucent” means that the observer has no particular attention and has only a color that makes it difficult to perceive its presence simply by glance. .

  The characteristic of being transparent or translucent under diffuse reflection required for the third ink is a performance necessary for preventing the second image (5) from being visualized under diffuse reflection, The characteristic of reflecting the light to emit the interference color (first color) is the performance required to express the second image (5) richly under the specular reflection light and the transmitted light. This is the performance required to give a different color (interference color complementary color: second color) to the latent image element group (8) appearing below.

  As described above, when the iris color pearl pigment is included in the third ink, it is one of the features of the present invention in observation under various different conditions assumed by the latent image printed material (1) of the present invention. In addition to the effect of changing one image, a large color change effect can also be added.

  In addition, when forming the second image (5) with a swelled image line of 5 μm or more, an iris pearl pigment having a so-called leafing effect, which has the effect of orienting the pearl pigment on the surface of the swelled ink film, It is desirable to use the used ink as the third ink.

  If a pearl pigment that does not have a leafing effect is used to form an image line with a bulge exceeding 5 μm, the pearl pigment is fixed in a random orientation within the image line, and therefore incident light Each pigment reflects in different directions, and a strong pearl effect cannot be obtained.

  On the other hand, when using a pearl pigment having a leafing effect, the orientation of all pearl pigments is fixed at the same angle on the surface of the image line, so that all pigments are incident when light enters from a specific direction. Can reflect light all at once, and a strong pearl effect can be obtained.

  In order to improve the leafing effect of the pearl pigment to be used, it is preferable to perform a special treatment such that the pigment is oriented on the surface of an image that is raised during printing. Specifically, for example, by performing surface treatment of the pigment such as water repellency and oil repellency treatment as described in JP-A-2001-106937, the pigment can be oriented on the surface of the image line of the printing portion. It is possible to make the interference color of pearl under specular reflection appear more vividly.

  The particle size of the pearl pigment is selected according to the printing method to be used, but is 1 μm to 50 μm, and preferably has an average particle size of about 5 to 15 μm.

  In the case of forming a rising image line of less than 5 μm, the direction of the pearl pigment is naturally aligned to some extent during the drying process, and thus such treatment is not essential. However, since the surface of the image line that reflects incident light becomes gentle as the height of the image line rises, between the second information portion (14) and the second background portion (15). It should be noted that a sufficient difference in the amount of reflected light is less likely to occur and the visibility of the second image is reduced.

  The relationship between the first ink and the second ink is as described above, but there are no particular restrictions on the relationship between the first ink and the third ink and the relationship between the second ink and the third ink.

  The effect of the latent image printed material (1) produced as described above will be described with reference to FIG. FIG. 10A shows an image that is visually recognized when the latent image print (1) of the present invention is observed under the condition that the observer's viewpoint (18a) exists under diffusely reflected light. In observation under diffuse reflection, the latent image element group (8) is invisible because it is hidden by the first background part (7) by the camouflage element group (9), and the second image (5). Is transparent and similarly invisible, so that the letter “A” as the first information part (6) is visually recognized with shading in the print image.

  In the present invention, “mainly visually recognized” does not mean that only the letter “A” is visually recognized, but the letter “A” while the first background portion (7) is lightly visible. Is a state in which the first background portion (7) is visually recognized with high contrast. This is because the latent image element group (8) and the camouflage element group (9) constituting the background portion (7) are in a color matching relationship under diffuse reflected light. In order to be completely concealed by the camouflage element group (9), the first background part (7) is visually recognized as a flat single tone, and the first information part (6) is included therein. The difference in reflection density due to the difference in area ratio between the area of the first background part (7) and the area of the first information part (6) Will be born and the letter “A” will be visually recognized.

  Here, the “difference in reflection density” refers to the darkness of an image, which is the amount of reflected light relative to the amount of light projected when light is projected onto an image printed on a substrate. .

  10 (b-1) and 10 (b-2) show a case where the latent image print (1) of the present invention is observed under the condition that the observer's viewpoint (18b) exists under specular reflection light. , Shows a visually recognized image. In observation under specular reflection light, the first image (4) formed within a certain area ratio range does not have an extreme shading, and thus is superimposed on the first image (4). The second image (5) formed is concealed by the strong pearl effect emitted from the second image (5) and becomes invisible. The letter “C” as the second information section (14) reflects the light from the third ink. And the first color that is the interference color emitted. Being visually recognized is the same as the visual recognition state in FIG.

  Further, according to the angle of incident light, the letter “C” appears dark when the background is bright, and the letter “C” appears bright when the background is dark. ). Thus, the effect that the image is negative-positive-inverted cannot be obtained unless an image line having a bulge is used, and gives high counterfeit resistance to the latent image printed material (1) in the present invention. Moreover, in order to simultaneously realize at a high level the pearl effect that produces a specific color under specular reflection light and the effect of negative / positive reversal of this image, it is desirable that the pearl pigment used be leafed on the surface of the image line. .

  FIG. 10C shows an image that is visually recognized when the latent image printed material (1) of the present invention is observed under the condition that the observer's viewpoint (18c) exists under transmitted light. . In the observation under transmitted light, the first information part (6) formed by limiting the area ratio has a light density, so that the first information part (6) changes lighter and becomes invisible by the light transmitted through the base material. The second image (5) produces a second color which is a complementary color of the interference color emitted when the third ink reflects light, but the second information portion (14) and the second background portion ( Since the area ratio of 15) is the same, the density itself does not occur, and as a result, the latent image element group (8) that strongly transmits light is visually recognized in the second color. Being visually recognized is the same as the visual recognition state in FIG.

  In addition, since the effect of the second color appearing in the latent image element group (8) visually recognized under transmitted light depends on the pearl effect at the time of regular reflection in order to make the color under transmitted light vivid. However, it is desirable that the pearl pigment is leafed on the surface of the image line.

  As described above, when the latent image printed material (1) is observed under diffuse reflected light, the first information part (6) is mainly visually recognized, and when observed under transmitted light, the latent image element When the group (8) is visually recognized and observed under specular reflection light, the second information unit (14) has an effect of being visually recognized. In addition, not only image changes, but also the pearl effect produced by the third ink, at the same time, a very rich color change is realized.

  In the embodiment, the latent image element (11) constituting each of the latent image element group (8), the camouflage element group (9), and the first information section (6) forming the first image (4). ), The camouflage element (12) and the first information element (13) are all described as an image line. However, the present invention is not limited to the image line. As shown in FIG. (8 '), the camouflage element group (9') and the first information part (6 ') may be formed of pixels without any problem.

  As shown in FIG. 11A, when the latent image element group (8 ′) is formed by pixels, the latent image element group (8 ′) has a constant pixel width (R1) and a constant pixel height (H1). ) Of the plurality of pixels are regularly arranged at a constant pitch (P1) in the first direction.

  The pixel height (H1) may be the same as or different from the pixel width (R1). The “first direction” in the present invention is the vertical direction in the drawing when the latent image element group (8 ′) is a pixel, and the pixels are regularly arranged in a matrix as shown in the figure. It is in a state.

  In addition, as shown in FIG. 11B, when the camouflage element group (9 ′) and the first information part (6 ′) are formed by pixels, the camouflage element group (9 ′) has a constant pixel width ( R2) and a plurality of camouflage elements (12 ′) composed of a plurality of pixels having a constant pixel height (H2) are regularly arranged at a constant pitch (P1) in the first direction. In the information section (6 ′), the first information element (13 ′) composed of a plurality of pixels having a constant pixel width (R1) and a constant pixel height (H1) is constant in the first direction. Are regularly arranged at a pitch (P1). Here, the camouflage element group (9 ′) and the first information part (6 ′) need to be arranged at positions where they do not overlap each other. There is no restriction on the height (H1, H2) and the pixel width (R1, R2).

  The pixel height (H1) may be the same as or different from the pixel width (R1), and the pixel height (H2) may be the same as or different from the pixel width (R2). good. In the present invention, the “first direction” means the vertical direction in the drawing when the camouflage element (12 ′) and the first information element (13 ′) are pixels. In this state, they are regularly arranged in a matrix.

  The latent image element (11 ′), the camouflage element (12 ′), and the first information element (13 ′) are formed of at least one of an image line and a pixel, or a combination thereof. That is, as shown in FIG. 12A, the latent image element (11 ′) and the camouflage element (12 ′) are formed by pixels, and the first information element (13 ′) is formed by an image line. Image lines and pixels may be combined in units of each. Further, as shown in FIG. 10B, in each of the latent image element (11 ′), the camouflage element (12 ′), and the first information element (13 ′), the image line and the pixel are combined with each other. May be. Further, as shown in FIG. 10C, in the latent image element (11 ′), the camouflage element (12 ′), and the first information element (13 ′), the image line and the pixel are set in each element. You may combine.

  The image line in the present invention is a group formed by collecting a plurality of printing halftone dots, which are minimum units for forming a printed matter, in a certain direction, and is not only a straight line but also a wavy line, a broken line, a dividing line, etc. Is also included. A pixel is a collection of a plurality of printing dots that are a minimum unit for forming a printed matter, and is not just a simple shape such as a circle or a square, but a minute shape. Characters, symbols, designs, etc. are also included.

  Further, in the embodiment, the first ink and the second ink have been described with a configuration on the assumption that they are visually the same color, but the color density of the first ink and the second ink is If they are different, the latent image element group (8) and the camouflage element group (9) are made the same color by changing the area ratio and pixel area ratio of the latent image element group (8) and the camouflage element group (9). Can do.

  For example, when the second ink is darker than the first ink, as shown in FIG. 13, from the element width (W1) of the latent image element (11 ″) constituting the latent image element group (8 ″). However, the latent image element group (8 ″) and the camouflage element group (9 ″) are reduced by reducing the element width (W3) of the camouflage element (12 ″) constituting the camouflage element group (9 ″). Can be the same color.

  In order to make the viewer visually recognize the letter “A”, which is the first meaningful information in the first image (4), under the diffuse reflected light, the first information part (6) and the first information One background part (7) needs to have a difference in light and shade, but if this light and dark difference is too large, it must disappear in observation under specular reflection light or transmitted light. The letter “A” may be visually recognized. In order to avoid this, it is desirable that the area ratio of the first information part (6) forming the character “A” does not exceed 50%. This depends on the color density of the ink to be used, but even when an extremely light ink is used, when the first information portion (6) is formed with an area ratio exceeding 50%, as described above. This is because a serious problem may occur.

  In order to make the latent image element group (8) clearly visible under transmitted light, the area ratio of the latent image element group (8) is preferably 30% or more. Although depending on the permeability of the penetrating ink used as the first ink, when the latent image element group (8) is formed with an area ratio of less than 30%, sufficient visibility is often not obtained. It is.

  In addition, for the purpose of determining whether or not the first ink, the second ink, and the third ink are reprinted or printed, or for the purpose of improving authenticity discrimination, a fluorescent pigment, a fluorescent dye, There is no problem even if functional materials such as luminescent pigments such as phosphorescent pigments, luminescent dyes, infrared absorbing materials and infrared reflecting materials are added.

  The base material (2) used in the latent image printed material according to the present invention has a characteristic that the ink penetrates into the base material when the penetrating ink is printed, such as high-quality paper or coated paper, and the base material itself. Must also be translucent. With an opaque plastic or metal, the effect of the appearance of the latent image element group (8) under the transmitted light of the present invention cannot be obtained.

  Hereinafter, examples of the latent image printed matter produced specifically will be described in detail according to the best mode for carrying out the invention described above, but the present invention is not limited to these examples.

  A first embodiment of the present invention will be described with reference to FIGS. White fine paper (manufactured by Nippon Paper Industries Co., Ltd.) was used as the substrate (2-1).

  FIG. 14 shows a latent image print (1-1) in Example 1. In the latent image printed matter (1-1), a gray printed image (3-1) is formed on at least a part of the substrate (2-1). For convenience of explanation, the characters “A”, “B”, and “C” are represented in the print image (3-1) in FIG. In the observation under diffuse reflection light, the characters “B” and “C” are not visible, and the characters “A” are visible.

  The first image (4-1), the second image (5-1), and the first image (4-1) constituting the print image (3-1). Information portion (6-1), first background portion (7-1), latent image element group (8-1) and camouflage element group (9) constituting the first background portion (7-1) -1) In addition, the second information part (14-1) and the second background part (15-1) constituting the second image (5-1) have been described in the embodiment. Since it is the same as that, it is omitted.

  In FIG. 15, the image according to the ink used which comprises the printing image (3-1) in Example 1 is shown. FIG. 15A shows an image formed with the first ink, and the image formed with the first ink is only the latent image element group (8-1). FIG. 15B shows an image formed with the second ink, which is an image in which the first information section (6-1) and the camouflage element group (9-1) are combined. FIG. 15C shows an image formed with the third ink, and this image is the second image (5-1).

  For the first ink, penetrating ink (T & K TOKA Best One Watermark Ink) was used. The first ink is colorless and transparent, but when it is printed on the substrate (2-1), it penetrates into the inside of the paper and increases the color density of the substrate in the printed area like oil stains. Therefore, when printed on a white base material (2-1) as in Example 1, it is visually observed as light gray.

  From this, the second ink used for forming the image of FIG. 15B is the same light gray colored ink (T & K TOKA as the color when the first ink penetrates the substrate (2-1)). Made by using a UV gray ink diluted with a varnish to about one-tenth.

  As the third ink used for forming the second image (5-1) in FIG. 15C, a UV drying type screen ink having the composition shown in Table 1 was used. The third ink is an ink containing a pearl pigment that is transparent or translucent under diffuse reflection light and emits a gold interference color under regular reflection light, and has a color flip-flop property. Further, it is observed as blue which is a complementary color of gold (yellow) under transmitted light. In addition, the pearl pigment used in Example 1 is subjected to a surface treatment of water repellency and oil repellency treatment.

  FIG. 16 shows an image line configuration of the latent image element group (8-1). The latent image element group (8-1) is configured by regularly arranging a plurality of latent image elements (11-1) having an image line width of 0.15 mm in the first direction at a pitch of 0.3 mm. The area ratio of the latent image element group (8-1) in Example 1 is 50%.

  FIG. 17 shows the image line structure of the camouflage element group (9-1) and the first information section (6-1). The camouflage element group (9-1) includes a plurality of camouflage elements (12-1) having a line width of 0.15 mm arranged regularly at a pitch of 0.3 mm in the first direction. The information section (6-1) is formed by regularly arranging a plurality of first information elements (13-1) having an image line width of 0.15 mm at a pitch of 0.3 mm in the first direction. . The camouflage element (12-1) and the first information element (13-1) do not overlap.

  In Example 1, since the first ink and the second ink have the same color relationship when printed on the substrate, the camouflage element group (9-1) and the latent image element group (8-1) The area ratio must be designed to be equal. Therefore, the area ratio of the camouflage element group (9-1) is the same 50% area ratio as the latent image element group (8-1). The area ratio of the first information image (13-1) is 50%.

  FIG. 18 shows an image line configuration of the second image (5-1). The second image (5-1) includes a second information part (14-1) and a second background part (15-1), and the second information part (14-1) has an image line width. A plurality of 0.2 mm second information lines (16a-1) are regularly arranged at a pitch of 0.35 mm in the second direction, and the second background part (15-1) is similarly drawn. A plurality of second background lines (16b-1) having a width of 0.2 mm are regularly arranged at a pitch of 0.35 mm in the third direction. The area ratio of the second information part (14-1) and the second background part (15-1) is about 57%.

  After forming the latent image element group (8-2) shown in FIG. 15A by the offset printing method using the first ink, the image shown in FIG. In the same manner, it is formed by the offset printing method. Subsequently, the second image (5-1) shown in FIG. 15 (c) is subjected to UV-drying screen printing using the third ink. A latent image printed matter (1-1) of the invention was obtained. In addition, the height of the image line of the 2nd information image line (16a-1) and the 2nd background image line (16b-1) in Example 1 is 12 micrometers.

  The effect of the latent image printed material (1-1) produced as described above will be described with reference to FIG. FIG. 19A shows an image that is viewed when the latent image print (1-1) of the present invention is observed under the condition that the observer's viewpoint (18a-1) is present under diffusely reflected light. In the observation under diffuse reflected light, the letter “A”, which is the first information part (6-1), was mainly visually recognized with gray shades in the printed image. .

  19 (b-1) and 19 (b-2) show the latent image print (1-1) of the present invention under the condition that the observer's viewpoint (18b-1) exists under specular reflection light. When observed, it shows an image that is visually recognized. In observation under specular reflection light, the letter “C” as the second information section (14-1) is accompanied by a golden interference color. It was visually recognized. When the background is bright, the letter “C” is dark, and when the background is dark, the letter “C” appears bright.

  FIG. 19C shows an image that is visually recognized when the latent image print (1-1) of the present invention is observed under the condition that the observer's viewpoint (18a-1) exists under transmitted light. In observation under transmitted light, the letter “B”, which is the latent image element group (8-1), was viewed brighter than the background in a slightly bluish color.

  As described above, when the printed image is observed under diffuse reflected light, the first information portion (6-1) is visually recognized. When the printed image is observed under transmitted light, the second information portion (14- When 1) was visually recognized and observed under specular reflection light, it was confirmed that the latent image element group (8-1) had an effect of being visually recognized.

  In the second embodiment of the present invention, unlike the first embodiment, an example in which the first image is formed by pixels instead of the image line will be described with reference to FIGS. As in Example 1, white fine paper (manufactured by Nippon Paper Industries Co., Ltd.) was used as the base material (2-2).

  FIG. 20 shows a latent image print (1-2) in Example 2. In the latent image printed matter (1-2), a gray printed image (3-2) is formed on at least a part of the substrate (2-2).

  The first image (4-2), the second image (5-2), and the first image (4-2) constituting the print image (3-2). Information portion (6-2), first background portion (7-2), latent image element group (8-2) and camouflage element group (9) constituting the first background portion (7-2) -2) and the second information part (14-2) and the second background part (15-2) constituting the second image (5-2) have been described in the embodiment. Since it is the same as that, it is omitted.

  In FIG. 21, the image according to the ink to be used which comprises the printing image (3-2) in Example 2 is shown. FIG. 21A shows an image formed with the first ink, and the image formed with the first ink is only the latent image element group (8-2). FIG. 21B shows an image formed with the second ink, which is an image in which the first information part (6-2) and the camouflage element group (9-2) are combined. FIG. 21C shows an image formed with the third ink, and this image is the second image (5-2). The same ink as in Example 1 was used as the first ink, the second ink, and the third ink.

  FIG. 22 shows a pixel configuration of the latent image element group (8-2). In the latent image element group (8-2), a latent image element (11-2) including a plurality of pixels having a pixel width of 0.7 mm and a pixel height of 0.7 mm has a pitch of 1.0 mm in the first direction. A plurality are arranged regularly and continuously. The area ratio of the latent image element group (8-2) in Example 2 is about 40%.

  FIG. 23 shows a pixel configuration of the camouflage element group (9-2) and the first information section (6-2). In the camouflage element group (9-2), a plurality of camouflage elements (12-2) including a plurality of pixels having a pixel width of 0.7 mm and a pixel height of 0.7 mm are continuously arranged at a 1 mm pitch in the first direction. The first information unit (6-2) is configured by regularly arranging the first information pixel (13-2) including a plurality of pixels having a pixel width of 0.7 mm and a pixel height of 0.7 mm. A plurality is regularly arranged continuously in the first direction at a pitch of 1 mm. The camouflage element (12-2) and the first information element (13-2) do not overlap.

  In Example 2, since the first ink and the second ink have the same color relationship when printed on the substrate, the camouflage element group (9-2) and the latent image element group (8-2) The area ratio must be designed to be equal. Therefore, the pixel area ratio of the camouflage element group (9-2) is the same area ratio as that of the latent image element group (8-1). The area ratio of the first information image (13-2) is 12.5%.

  FIG. 24 shows the configuration of the second image (5-2). The second image (5-2) includes a second information part (14-2) and a second background part (15-2), and the second information part (14-2) has an image line width. A plurality of 0.2 mm second information lines (16a-2) are regularly arranged with a pitch of 0.35 mm in the second direction, and the second background portion (15-2) has the same image. A plurality of second background lines (16b-2) having a line width of 0.2 mm are regularly arranged at a pitch of 0.35 mm in the third direction. The area ratio of the second information part (14-2) and the second background part (15-2) is about 57%.

  After forming the latent image element group (8-2) shown in FIG. 21A by the offset printing method using the first ink, the image shown in FIG. In the same manner, it is formed by the offset printing method. Subsequently, the second image (5-2) shown in FIG. 21 (c) is subjected to UV drying type screen printing using the third ink. A latent image printed matter (1-2) of the invention was obtained. The height of the second information image line (16a-2) and the second background image line (16b-2) in Example 2 is 12 μm.

  The effect of the latent image printed material (1-2) produced as described above will be described with reference to FIG. FIG. 25A shows an image that is visually recognized when the latent image printed material (1-2) of the present invention is observed under the condition that the observer's viewpoint (18a-2) exists under diffusely reflected light. In the observation under diffuse reflected light, the letter “A”, which is the first information part (6-2), was mainly visually recognized with gray shades in the printed image. .

  25 (b-1) and 25 (b-2) show the latent image print (1-1) of the present invention under the condition that the observer's viewpoint (18b-2) exists under specular reflection light. When observed, it shows an image that is visually recognized. In observation under specular reflection light, the letter “C”, which is the second information section (14-2), is accompanied by a golden interference color. It was proactively viewed. When the background is bright, the letter “C” is dark, and when the background is dark, the letter “C” appears bright.

  FIG. 25C shows an image that is visually recognized when the latent image printed material (1-2) of the present invention is observed under the condition that the observer's viewpoint (18a-2) is present under transmitted light. In observation under transmitted light, the letter “B”, which is the latent image element group (8-2), was visually perceived brighter than the background in a slightly bluish color.

  As described above, when the printed image is observed under diffuse reflected light, the first information portion (6-2) is visually recognized. When the printed image is observed under transmitted light, the second information portion (14- When 2) was visually recognized and observed under specular reflection light, it was confirmed that the latent image element group (8-2) had an effect of being visually recognized.

  In Example 3 of the present invention, unlike the examples in Example 1 and Example 2, the first ink and the second ink are not the same color but have the same hue, but using inks having different color densities. An example in which the latent image printed material of the present invention is formed will be described with reference to FIGS. As in Example 1 and Example 2, white fine paper (manufactured by Nippon Paper Industries Co., Ltd.) was used as the base material (2-3).

  FIG. 26 shows a latent image printed material (1-3) in Example 3. In the latent image printed matter (1-3), a gray printed image (3-3) is formed on at least a part of the substrate (2-3).

  The first image (4-3), the second image (5-3), and the first image (4-3) constituting the print image (3-3). Information section (6-3), first background section (7-3), latent image element group (8-3) and camouflage element group (9) constituting the first background section (7-3). -3) and the second information part (14-3) and the second background part (15-3) constituting the second image (5-3) have been described in the embodiment. Since it is the same as that, it is omitted.

  In FIG. 27, the image according to the ink used which comprises the printing image (3-3) in Example 3 is shown. FIG. 27A shows an image formed with the first ink, and the image formed with the first ink is only the latent image element group (8-3). FIG. 27B shows an image formed with the second ink, which is an image in which the first information section (6-3) and the camouflage element group (9-3) are combined. FIG. 27C shows an image formed with the third ink, and this image is the second image (5-3).

  In Example 3, penetrating ink (Teikoku Unimark) was used as the first ink. The first ink has a slightly yellowish translucent color like general oil, but when it is printed on the substrate (2-3), it penetrates into the inside of the paper, Since the color density of the base material in the printed area increases like oil stains, when printed on a white base material (2-3) like the first ink used in Example 1 and Example 2, Visually it is observed as light gray.

  On the other hand, in Example 3, the second ink used for forming the image in FIG. 27B is approximately twice the color density when the first ink penetrates the substrate (2-1). A slightly dark gray colored ink (an ink obtained by diluting UV gray ink made by T & K TOKA to about 1/5 with varnish) was used.

  As the third ink used for forming the second image (5-3) in FIG. 27C, a UV drying type screen ink having the composition shown in Table 2 was used. The third ink is an ink containing a pearl pigment that is transparent or translucent under diffuse reflection light and emits a red interference color under regular reflection light, and has a color flip-flop property. Further, it is observed as green which is a complementary color of red under transmitted light. Note that the pearl pigment used in this example is also subjected to a surface treatment of water repellency and oil repellency treatment.

  FIG. 28 shows an image line configuration of the latent image element group (8-3). The latent image element group (8-3) is formed by regularly arranging the latent image elements (11-3) having an image line width of 0.3 mm at a pitch of 0.4 mm in the first direction. The area ratio of the latent image element group (8-2) in Example 3 is 75%.

  FIG. 29 shows the structure of an image formed with the second ink. The camouflage element group (9-3) is composed of camouflage elements (12-3) having a line width of 0.15 mm arranged regularly at a pitch of 0.4 mm in the first direction. The information section (6-3) is formed by regularly arranging first information pixels (13-3) having an image line width of 0.15 mm continuously at a pitch of 0.4 mm in the first direction. The camouflage element (12-3) and the first information element (13-3) do not overlap.

  In Example 3, since the difference in color density between the first ink and the second ink when printed on the substrate is twice, the camouflage element group (9-3) and the latent image element group ( In order to make 8-3) the same color, the camouflage element group (9-3) needs to be designed to have a half area ratio of the latent image element group (8-3). Therefore, the area ratio of the camouflage element group (9-3) is half that of the latent image element group (8-3). The area ratio of the first information image (13-3) is 25%.

  FIG. 30 shows the configuration of the second image (5-3). The second image (5-3) includes a second information portion (14-3) and a second background portion (15-3), and the second information portion (14-3) has an image line width. A plurality of 0.3 mm second information lines (16a-3) are regularly arranged at a pitch of 0.51 mm in the second direction, and the second background part (15-3) is similarly drawn. A plurality of second background lines (16b-3) having a width of 0.3 mm are regularly arranged in the third direction at a pitch of 0.51 mm. The area ratio of the second information part (14-3) and the second background part (15-3) is 59%.

  After forming the latent image element group (8-3) shown in FIG. 27A by the offset printing method using the first ink, the image shown in FIG. In the same manner, it is formed by the offset printing method. Subsequently, the second image (5-3) shown in FIG. A latent image printed matter (1-3) of the invention was obtained. In addition, the height of the image line of the 2nd information image line (16a-3) and the 2nd background image line (16b-2) in a present Example is 14 micrometers.

  The effect of the latent image printed material (1-3) produced as described above will be described with reference to FIG. FIG. 31 (a) shows an image that is visually recognized when the latent image print (1-3) of the present invention is observed under the condition that the observer's viewpoint (18a-3) exists under diffusely reflected light. In the observation under diffuse reflected light, the letter “A”, which is the first information section (6-3), was mainly visually recognized with gray shades in the printed image. .

  31 (b-3) and 31 (b-3) show the latent image print (1-3) of the present invention under the condition that the observer's viewpoint (18b-3) exists under specular reflection light. When observed, it shows an image that is visually recognized. In observation under specular reflection light, the letter “C”, which is the second information section (14-3), is accompanied by a red interference color. It was visually recognized. When the background is bright, the letter “C” is dark, and when the background is dark, the letter “C” appears bright.

  FIG. 31 (c) shows an image that is visually recognized when the latent image printed material (1-3) of the present invention is observed under the condition that the observer's viewpoint (18a-3) exists under transmitted light. In observation under transmitted light, the letter “B”, which is the latent image element group (8-3), was viewed brighter than the background in a slightly greenish color.

  As described above, when the printed image is observed under diffuse reflected light, the first information part (6-3) is visually recognized. When the printed image is observed under transmitted light, the second information part (14- When 3) was visually recognized and observed under specular reflection light, it was confirmed that the latent image element group (8-3) had an effect of being visually recognized.

1, 1-1, 1-2, 1-3 Latent image printed matter 2, 2-1, 2-2, 2-3 Base material 3, 3-1, 3-2, 3-3 Print image 4, 4- 1, 4-2, 4-3 1st image 5, 5-1, 5-2, 5-3 2nd image 6, 6-1, 6-2, 6-3 1st information part 7, 7-1, 7-2, 7-3 First background portion 8, 8 ′, 8 ″, 8-1, 8-2, 8-3 Latent image element group 9, 9-1, 9-2, 9-3 Camouflage element group 11, 11 ′, 11 ″, 11-1, 11-2, 11-3 Latent image element 12, 12 ′, 12 ″, 12-1, 12-2, 12-3 Camouflage Element 13, 13 ′, 13 ″, 13-1, 13-2, 13-3 First information element 14, 14-1, 14-2, 14-3 Second information part 15, 15-1, 15-2, 15-3 Second background portions 16a, 16a-1, 16a-2, 6a-3 Second information lines 16b, 16b-1, 16b-2, 16b-3 Second background lines 17, 17-1, 17-2, 17-3 Light sources 18a, 18a-1, 18a- 2, 18a-3, 18b, 18b-1, 18b-2, 18b-3, 18c, 18c-1, 18c-2, 18c-3

Claims (7)

A printed image having a color different from that of the substrate is formed on at least a part of the substrate having transparency, and the printed image is formed by forming a second image on the first image,
The first image consists of a first information part and a first background part,
The first information portion is formed by arranging a plurality of first information elements formed of a second ink regularly in a first direction at a constant pitch,
In the first background portion, a plurality of latent image elements formed of a first ink different from the second ink are regularly arranged at a constant pitch in the same direction as the first direction. A plurality of latent image element groups, and a plurality of camouflage elements formed with the second ink regularly arranged in the same direction as the first direction at a constant pitch, The latent image element group and the camouflage element group are color-matched under diffuse reflection,
The first information element, the latent image element and the camouflage element are arranged without overlapping each other;
The second image consists of a second information part and a second background part,
The second information section includes a plurality of information lines having a bulge formed by a third ink different from the first ink and the second ink at a constant pitch in the second direction. In the second background portion, a plurality of background lines having a bulge formed from the third ink are arranged at a constant pitch in a third direction different from the second direction. The area ratio of the second information part and the second background part is substantially the same,
The first ink is a penetrating ink containing a penetrating component that changes the transmittance of the substrate, and the second ink is a colored ink having the same hue as the first ink, The third ink is a pearl ink containing a pearl pigment,
When observed under diffuse reflected light, the first information portion is mainly visually recognized. When observed under transmitted light, the latent image element group is primarily visually recognized and observed under regular reflected light. In this case, the latent image printed matter is characterized in that the second information part is mainly visually recognized. The latent image printed matter according to claim 1, wherein the latent image element, the camouflage element, and the first information element are at least one of an image line and a pixel, or a combination thereof. The latent image printed matter according to claim 1 or 2, wherein the first direction and the second direction, and the first direction and the third direction are different directions. 4. The latent image printed matter according to claim 1, wherein heights of the information image line and the background image line having a bulge are 5 μm or more. 5. 5. The latent image printed matter according to claim 1, wherein an area ratio of the second information portion and an area ratio of the second background portion are 50% or more. 6. The latent image printed matter according to any one of claims 1 to 5, wherein the angle difference between the second direction and the third direction is 10 degrees or more. The latent image printed matter according to any one of claims 1 to 6, wherein the pearl pigment contained in the third ink is leafed on the surface of the ink film having a bulge.

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