JP6394975B2 - Anti-counterfeit printed matter - Google Patents

Description

  The present invention is easy to authenticate when printed on a color copier or monochrome copier on printed matter that requires prevention of counterfeiting or falsification of securities such as banknotes, stock certificates and bonds, various certificates and important documents. The present invention relates to an anti-counterfeit printed matter that can be identified.

  Countermeasures against counterfeiting and falsification are important factors in banknotes, stock certificates, securities such as bonds, printed materials such as various certificates and important documents. These anti-counterfeiting and tampering measures for printed materials can be recognized visually by mainly using a method that uses designs with diversified geometric patterns in the design and some means and action on the printed material. There is a way to display a latent image that can not be. Typical examples of the former include tint blocks, color patterns, and relief patterns that are widely used in the design of securities prints, etc., and typical examples of the latter include normal reproduction of colors on latent image intaglios and color copiers. There are functional inks or copy-preventing image lines that cannot be used.

  The above-mentioned background pattern, chromatic pattern, relief pattern, etc. are basically composed of a set of curved lines with a fixed line width, and are counterfeited with design characteristics such as the design of printed matter. It can be a falsification prevention measure. By making the pattern complicated, it is difficult to produce the same pattern on the counterfeit material, and it is difficult to reproduce with a color copier. The role of anti-counterfeiting is enhanced by generating moire for the scanning input / output of the machine or scanner.

  The above-mentioned patterns are widely used worldwide in the design of securities prints, etc., and have been used for a long time as patterns of prints with monetary value such as banknotes, stock certificates, bonds, etc. It is an important design as a design to attach. Therefore, in the printed matter such as banknotes, stock certificates, bonds and other securities, various certificates and important documents, the background pattern, the colored pattern, the relief pattern, etc. are indispensable in design. However, recently, with the advent of sophisticated photoengraving apparatuses, color copiers and monochrome copiers, there is a drawback in that sufficient anti-counterfeiting and falsification preventing effects are not brought about.

  In addition, copy protection is generally used as a typical technique for displaying latent images that could not be recognized visually by adding some means and action to the printed matter. There is a series of techniques called drawing lines. Also, the latent image is printed on the surface of the paper with halftone dots, the background of the same density as the latent image is simultaneously printed on the lines, and the decorative pattern is not reproduced on the upper surface of the latent image including the background. By overprinting with transparent ink, the surface of the printed material is finished nicely and when it is copied, the pattern disappears, the background is reproduced, the latent image is not reproduced, and the density difference between the background and the latent image becomes obvious There have been numerous applications for a method that makes it possible to recognize at first glance that this is a copy.

  In many of these inventions, a latent image is formed by the density of an image line group (hereinafter referred to as “screen pattern”) in which dots and lines such as halftone dots or lines are continuously arranged at a constant period, as shown in a printed matter. The pattern on the entire printed surface is a screen pattern having a uniform density. When a printed material with this latent image is copied by a color copier or monochrome copier, there is a difference in density between the densely printed screen pattern that is not reproduced and the coarsely reproduced screen pattern that is reproduced. As a result, the latent image portion of the densely structured screen pattern that is not reproduced appears with respect to the reproduced coarsely structured screen pattern so that it is obvious that it is a copy.

  Further, the applicant of the present application also printed a latent image composed of a pattern such as halftone dots or lines on the surface of the paper and a background composed of a pattern different in density from the latent image around the latent image in one color at the same time. As a printed matter suitable for copy prevention, the latent image pattern to which the latent image is applied cannot be identified with the naked eye, another pattern for camouflaging the latent image, a light transparent ink, and a light colored A method of camouflaging has already been filed without using overprinting, such as a white circle pattern or a concentric circle pattern in which the halftone dot percentage of the partial screen pattern is increased with respect to the entire screen pattern (for example, patent document) 1).

  In addition, a latent image is formed using either one of the lines or halftone dots as a constituent, and a background is formed using the other as a constituent, and the lines are 50 lines 10% and the dots are 150 lines 10%. In order to camouflage the entire image line of the latent image and the background image on the original film, an image line configuration has already been filed in which a ground pattern consisting of halftone dots of 175 lines is incorporated and printed on the paper once printed. (For example, see Patent Document 2).

  In addition, the applicant of the present application has a shape in which a curved line-shaped pattern is arranged in a continuous line in a portion where a latent image is not applied, and in a direction in which the image line in a portion where a latent image is applied is arranged in a basic line direction. A portion corresponding to one cycle consisting of one non-image portion and one non-image portion that is continuous in the basic line direction among the fixed-cycle break lines that consist of a fixed-line break line consisting of image lines Among the continuous lines of the part where the latent image area is not applied, the image line of the part corresponding to the same length as one period consisting of the image line part and the non-image part in the aforementioned latent image part In the image line that is equal to the area and is the fixed-cycle break line of the part where the latent image is applied, the image line of the fixed-cycle break line intersects with one of the image lines. Is filed within the range of the line width of the other line, and a method for creating a copy-protection pattern and its printed matter are filed. And it is (for example, see Patent Document 3.).

  In addition, the applicant of the present application forms an image pattern composed of one or a plurality of straight lines or curved lines, a solid line for a portion where a latent image is not applied, and an image line for a portion where a latent image is applied. A latent image was applied to a printed material that consisted of a constant periodic break consisting of a plurality of lines that were branched at equal intervals with the basic line direction as a reference, and the branched lines were arranged at regular intervals. The total image area of a portion corresponding to one cycle consisting of an image portion and a non-image portion branched in a plurality in the basic line direction is the solid line of the portion where the latent image is not applied. By making it equal to the image area of the portion corresponding to the same length as one cycle consisting of the image area and the non-image area in the latent image area, the image becomes invisible when copied, and the image visually recognized before copying is displayed. The image line to be configured is one cycle composed of the image line portion and the non-image line portion in the latent image portion described above. Same and filed a printed material such as larger than streaked area of the portion corresponding to the length (e.g., see Patent Document 4.). This printed matter can be observed as a latent image that was an invisible image after copying with a color copier or a monochrome copier, and the pattern that was a visible image can be observed to be replaced. It is increasing.

  Further, the applicant of the present invention forms a background portion having the same density by the first size image line reproduced by the copier and the second size image line not reproduced by the copier. By forming the visible image portion with a third size image line that is not reproduced by the machine, when the printed matter is observed under normal light, the visible image is displayed depending on the density of the visible image portion formed on the background portion. Observed, but when the printed matter is copied with a copying machine such as a color copying machine, the third size image line forming the visible image portion and the second size image line forming the background portion are reproduced. In this case, a copy and falsification-prevented printed material having an image change effect in which a latent image different from a visible image appears is filed (see, for example, Patent Document 5).

Japanese Patent No. 2695523 Utility Model No. 3010365 Japanese Patent No. 3268418 Japanese Patent No. 3689786 Japanese Patent No. 569663

  However, the printed matter of Patent Documents 1 and 2 does not exhibit the copy prevention function because the image line configuration can be easily reproduced when a recent highly functional plate making and printing output device is used. There was a thing.

  In addition, the printed matter of Patent Document 3 and Patent Document 4 has improved the effect at the time of copying, but the pattern that was a visible image is not completely replaced, and the visible image and the latent image are overlapped with the visible image. Is prioritized, and the latent image is partially missing, and there is a problem of improving the visibility of an image viewed after copying.

  Furthermore, the printed matter of Patent Document 5 has the visible image and the latent image appearing in the copied material completely interchanged in the printed matter and the copied matter. A regular image line that forms a latent image creates an image change effect due to an on / off relationship that remains or disappears. Since the latent image itself is a binary image, the visible image is There remains a problem that a method of creating a counterfeit product by processing an image of a copy that has disappeared and a latent image has appeared does not have high counterfeit resistance.

  The present invention aims to solve the above-described problems, and has an effect of changing a visible image formed on a printed matter and a latent image appearing when copied by a copying machine, and a copied matter. The present invention relates to a forgery-preventing printed matter in which a latent image appearing in the above can be a continuous tone image such as a photographic image.

  The anti-counterfeit printed matter of the present invention has a printing area on at least a part of a substrate, and the printing area is formed by regularly forming a plurality of units having at least a latent image area and a camouflage area at a constant pitch. The area is formed by forming a first image line that is reproduced by the copying machine, and the camouflage area is formed by forming a second image line that is not reproduced by the copying machine, and is formed in each unit. The total area of the image line and the second image line is formed in the same area in all units, and a latent image having continuous gradation is formed by the size of the area of the first image line formed in the latent image region. When the printed matter is observed under normal light, it is observed in the same density state. However, when the printed matter is copied with a copying machine, the second image line formed in each unit disappears, The continuous tone formed by one image line Is anti-counterfeit printed matter characterized in that the latent image becomes obvious.

  Further, the first image line in the anti-counterfeit printed matter of the present invention is a straight line or a curved line by a plurality of first image lines formed in each unit formed adjacent to each other along the first direction. A forgery-preventing printed matter characterized in that a pattern in shape is formed.

  In addition, the second image line in the forgery-preventing printed material according to the present invention is a forgery-preventing printed material formed by an image line or a pixel.

  The forgery-preventing printed matter of the present invention is characterized in that the total area of the first image line and the second image line formed in each unit is in the range of 15% to 30%. Printed material.

  In addition, the camouflage area of each unit in the printed matter for preventing forgery of the present invention further has a third image line that cannot be reproduced by the copying machine, and a visible image is formed by the third image line. When a visible image formed with the third image line is observed and the printed material is copied, the second image line and the third image line formed in each unit disappear. A forgery-preventing printed matter characterized in that a visible image is changed to a latent image.

  In addition, the third image line in the forgery-preventing printed material according to the present invention is a forgery-preventing printed material characterized by being formed by an image line or a pixel.

  In addition, the anti-counterfeit printed matter of the present invention is that a visible image having a continuous tone is formed by forming the area ratio of the third image line formed in each unit at an arbitrary area ratio. It is a printed matter for preventing forgery.

  The forgery-preventing printed matter of the present invention is a forgery-preventing printed matter characterized in that a constant pitch between units is 1 mm or less.

  Further, in the printed matter for preventing forgery of the present invention, the total area of the first image line, the second image line, and the third image line formed in each unit is in the range of 15% to 45%. Is a printed matter for preventing forgery.

  The anti-counterfeit printed matter of the present invention has a high anti-counterfeiting power against forgery that processes a copy since the image visually recognized on the copy can be an image having a complex continuous tone.

  In addition, when the anti-counterfeit printed matter of the present invention is used as an identification card including a face image or the like, it can form a latent image pattern having the same pattern as the face photo. And the latent image can be easily distinguished from each other.

The figure which shows the structure of the printed matter in 1st Embodiment The figure which shows the structure of the copy in 1st Embodiment The figure which shows the unit of the minimum unit in 1st Embodiment. The figure which shows the 1st image line and the 2nd image line which form a latent image in each unit The figure which shows the state which formed the highlight and the shadow by the 1st drawing line and the 2nd drawing line The figure which shows the modification of the unit in 1st Embodiment. The figure which shows the modification of the 1st drawing line in 1st Embodiment The figure which shows the structure of the printed matter in 2nd Embodiment The figure which shows the structure of the copy in 2nd Embodiment The figure which shows the unit of the minimum unit in 2nd Embodiment. The figure which shows the relationship of the 1st drawing line, 2nd drawing line, and 3rd drawing line which are formed in each unit. The figure which shows the printed matter corresponding to the identification card in 3rd Embodiment The figure which shows the copy area | region in 3rd Embodiment

  DETAILED 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 for carrying out the invention described below, and the scope of the technical idea described in the claims. Within the scope, various other embodiments are included.

(First embodiment)
An anti-counterfeit printed matter (hereinafter referred to as “printed matter”) in the first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a printed matter (1) in the first embodiment, in which a printed pattern (2) having a copy prevention function is formed on a substrate. As shown in the enlarged view of FIG. 1, the printed pattern (2) includes a first image line (3) of a size that is reproduced during copying and a second image line (4) of a size that is not reproduced during copying. Is formed. The first image line (3) is a line pattern regularly formed at a constant pitch, and the image line width of the first image line (3) is formed in accordance with the grayscale image forming the latent image. By doing so, a latent image is formed.

  The second image line (4) is formed by a plurality of image lines arranged at positions close to the first image line (3) regularly formed at a constant pitch. The line width of the first image line (3) expressing the gradation of the latent image image so that the image area ratio obtained by summing the image line (3) and the second image line (4) is constant. It is formed by changing the line area ratio according to the increase / decrease.

  Since the second image line (4) needs to be formed as an image line that is not reproduced by a copying machine such as a color copying machine, it is necessary to form the second image line (4) apart from each image line by 120 μm or more. In consideration of the state of visual recognition below, it is preferable to form regularly with a certain interval. When the interval between the second image lines (4) is less than 120 μm, the two second image lines (4) are not detected as separated by the copying machine, and the two second image lines (4) are not detected. ) And the non-reproduced image line that is the purpose of the second image line (4).

  In the first embodiment, the first image line (3) is a line pattern regularly formed at a constant pitch, and the second image line (4) is a fixed line pattern arranged at a constant interval. Although it is formed by a periodic disconnection line, even if the first image line (3) is formed in different shapes such as a dotted line, a wavy line, and a double line, it is not particularly limited as long as it is reproduced by a copying machine. Furthermore, if the second image line (4) is formed in the shape of an image line that is not reproduced by the copying machine, such as a minute dot that is not reproduced by the copying machine, the same effect can be obtained.

  FIG. 2 shows a copy (6) of the printed material (1) in the first embodiment. As shown in FIG. 2, in the copy pattern (7) in the copy (6), the latent image formed by increasing or decreasing the image line width of the first image line (3) is visualized. As shown in the enlarged view of FIG. 2, the second image line (4) formed in such a size that cannot be reproduced by the color copying machine disappears in the copy (6), and thus is the same in a specific area. The state observed at the density can no longer be maintained, the density difference of the first image line (3) expressing the density of the latent image is reproduced as it is, and the copy pattern (7) is visualized. In the enlarged view of FIG. 2, the disappearing second image line (4) is indicated by a dotted line, but the second image line (4) in the actual copy (6) has disappeared and the first image line (4) has disappeared. Only the stroke (3) is reproduced.

  Next, the image line configuration of the printed matter (1) in the first embodiment will be described with reference to FIG. FIG. 3 shows the minimum unit image line unit (U) formed on the printed matter 1 in the first embodiment, and the first image formed in a pair of relations in each unit (U). It has a region (A) where the line (3) is arranged and a region (B) where the second image line (4) is arranged, and the first image line (3) in all the units (U). And the second image line (4) are formed so that the total value of the image area is the same. Thereby, since the density in all the units (U) can be made constant, the density of the printed pattern (2) becomes constant, and the latent image can be hidden.

  Each unit (U) is preferably formed at a pitch of 1 mm or less. When the unit (U) is formed at a pitch of 1 mm or more, the resolution of the latent image is lowered. Therefore, when the printed matter (1) is observed under normal light, the latent image may be slightly observed. It is not preferable.

  In the printed matter (1) in the first embodiment, the first image line (3) is formed in the region (A) having a width of 130 μm and a height of 320 μm, and the second image line (4) is formed in a width of 290 μm. A printed pattern (2) is formed by forming the smallest unit (U) formed in the region (B) having a height of 320 μm in a matrix. The first image line (3) is formed in the unit (U) adjacent in the vertical direction. The first image line (3) is adjacent to the center of each image line (3). Thus, a single line is formed, and the line width is increased or decreased in accordance with the shade of the latent image expressed in each unit (U).

  The first image line (3) is formed from an image line with a width of 55 μm representing the lowest density of the latent image, with an image line width (W1) with a width of 91 μm representing the highest density. Note that when the line width (W1) of the first line (3) is formed with an image line width of less than 50 μm, the line width is not reproduced depending on the resolution of the copying machine. Can't get. In addition, the distance between the first image line (3) and the second image line (4) formed in each unit (U) needs to be 10 μm or more apart. This is because there is a possibility that the second image line (4) is not lost because it is detected as an image line combined with the first image line (3) that is close by the copying machine.

  In addition, the second image line (4) is formed at a predetermined position in each unit (U), thereby forming a periodic break line formed regularly at a constant pitch. The second image line (4) needs to be formed with an image line width (W2) of 45 μm or less as an image line of a size that cannot be reproduced by a copying machine, and can preferably be printed at 40 μm or less. The stroke width. The second image line (4) formed in each unit (U) is not necessarily formed at the position of the second image line (4) shown in FIG. 3, and the second image line (4) in each unit (U) is not necessarily formed. The place is not particularly limited as long as the combined line area of the first drawing line (3) and the second drawing line (4) has the same area ratio. However, when the second image lines (4) formed in each adjacent unit (U) are formed at a distance of less than 100 μm, by detecting these image lines as one image line, Since there is a possibility that the second image line (4) is reproduced on the copied material, the second image line (4) formed between the adjacent units (U) is also separated by 100 μm or more. More preferably, the second image line (4) is arranged at the same position (vertical position) in each unit (U), so that it is formed in all the units (U). Since the second image line (4) is formed at the same pitch, the density in the printed pattern (2) can be kept more constant. In order to make the line area the same in each unit (U), the line width (W3) of the second line (4) is adjusted as appropriate. This will be described in detail later.

  FIG. 4 shows the configuration of the first image line (3) for forming the latent image and the second image line (4) for forming the background of the latent image, in each unit (U). The maximum value of the line area ratio is 22%. The first image line (3) reproduces the positive image (3a) of the copy pattern as it is, and is formed by correcting the density of the image into a latent image image that can be expressed with an image area ratio of 22%. . The second image line (4) forms a negative image (4a) of a copy pattern, and the first image line (3) is arranged as the lightest image line of the latent image. In this case, the second image line (4) corresponding to each unit (U) is used by using an image whose density is corrected up to a negative image that can be formed with an image line area ratio of 9%. By forming, the concentration in each unit (U) can be kept constant.

  FIG. 4 shows a gradation image that can be represented by the first image line (3) when the image line area ratio formed in each unit (U) is 22%. As shown in FIG. 4, when forming the lightest color portion of the latent image, the area ratio of the first image line (3) is formed with 13% of the minimum value, and is formed in the unit (U). By forming the second image line (4) formed with an image area ratio of 9% to compensate for the density of the first image line (3), the image area ratio in the unit (U) is 22%. can do.

  Similarly, when the first image line (3) having an image area ratio of 15% is formed, the second image line (4) having 7% is formed and the first image line (3 having 18% is formed). ) Is formed, 4% of the second image line (4) is formed, and when 20% of the first image line (3) is formed, 2% of the second image line (4) is formed. Is formed and 22% of the first image line (3) is formed, the second image line (4) is not arranged as 0%. With the above combination, the image area ratio in each unit (U) can be maintained at 22%, so that the latent image formed in the printed pattern (2) can be formed in an invisible state. . For the second image line (4), it is desirable to fix the image line width (W2) and change the image line width (W3). In FIG. 4, the example in which each of the first image line (3) and the second image line (4) fluctuates by an integer% is described. However, the present invention is not limited to this example. The first image line (3) is set to 13.5%, the second image line (4) is set to 8.5%, and the first image line (3) and the second image line (4) in the unit (U). It is sufficient if the total area ratio of) can be set to 22%.

  Moreover, although FIG. 4 demonstrated in the example which made the total area of the 1st image line (3) and the 2nd image line (4) in each unit (U) 22%, it is limited to this. Instead, if the total area of the two image lines is set within the range of 15% to 30%, the effect of the printed matter of the present invention can be obtained. When the line area ratio in each unit (U) is less than 15%, the width for expressing the continuous tone of the latent image becomes small, which is not preferable because the latent image is unclear. Further, when the image area ratio in each unit (U) is more than 30%, it is not preferable because the density of the entire printed matter is increased and the design is impaired.

  In FIG. 5, the highlight or shadow of the latent image is formed by the first image line (3) and the second image line (4), and the shadow portion is formed by the first image line (3). In the case of forming (lower part of FIG. 5), the second image line (4) is not formed at all, and when the highlight portion is formed by the first image line (3), the second image line (4) is formed. ) Is formed as the image line with the highest density.

  FIG. 6 shows a modification of the unit (U) in the printed matter (1) according to the first embodiment. As described above, the line area ratio in each unit (U) is formed at a constant density. If possible, the shape, arrangement position, number, etc. of the first image line (3) and the second image line (4) are not particularly limited, and as shown in FIG. A configuration in which (4) is formed in the same direction as the first image line (3), or, as shown in FIG. As shown in FIG. 6 (c), it is possible to use a method such as forming only the second image line (4) by the sum of a plurality of dot shapes, and these configurations are within the scope of the present invention. It is.

  Further, a plurality of units (U) formed adjacent to each other can be arranged as long as the upper side and the lower side of the units (U) arranged adjacent to each other in the first direction (vertical direction in FIG. 7) coincide with each other. The unit (U) can be formed by distorting it into a diamond shape. By forming the distortion of the rhombus at an arbitrary angle, a drawing line pattern on a curve can be formed by a set of the first drawing lines (3) formed adjacent to each other in the first direction. Thereby, the tint block pattern etc. which considered design nature can be formed by the 1st drawing line (3).

(Second Embodiment)
Next, the printed matter (1) according to the second embodiment of the present invention will be described with reference to the drawings, but the first image line having the same configuration as the printed matter (1) according to the first embodiment. Description of (3) and the second image line (4) will be omitted, and the third image line (8) that forms a visible image, which is a characteristic part of the second embodiment, will be described in detail.

  FIG. 8 shows a printed matter (1) in the second embodiment, in which a visible image observed under normal light is formed in a printed pattern (2) formed on a substrate. is there. The printed matter (1) in the second embodiment is similar to the printed matter (1) in the first embodiment, the first image line (3) for forming a latent image, and the first image line ( By arranging the second image line (4) for camouflaging the density difference formed by the increase / decrease of the image line width in 3), the image line density in each unit (U) is kept constant, and the latent image is It is not visible.

  As shown in the enlarged view of FIG. 8, the printed matter (1) in the second embodiment is camouflaged with the gradation formed by the increase / decrease of the line width of the first image line (3). In addition to the image line (4), a third image line (8) that is not reproduced by the copying machine is formed, and a constant density is obtained when the printed matter (1) of the first embodiment is observed under visible light. By forming a third image line (8) for forming a visible image in the printed pattern (2) visually recognized as, the third image line ( The visible image formed in 8) is visually recognized.

  FIG. 9 shows a copy (6) of the printed product (1) in the second embodiment. The copy pattern (7) formed on the copy (6) shown in FIG. 9 is a visualization of the latent image formed on the first image line (3). This is because the second image line (4) and the third image line (8) formed on the printed material (1) in the second embodiment are formed with image lines having a size that is not reproduced during copying. Therefore, as shown in the enlarged view of FIG. 9, the first image line (3) is not reproduced on the copy (6), and only the first image line (3) is formed. A latent image having a continuous gradation expressed by light and shade appears by increasing or decreasing the line width. In the enlarged view of FIG. 9, the second image line (4) and the third image line (8) are indicated by dotted lines, but the second image line (4) in the actual copy (6). And the third image line (8) disappears and only the first image line (3) is reproduced.

  FIG. 10 shows an image line unit (U) as a minimum unit formed on the printed matter (1) in the second embodiment. Each unit (U) has an area (A) where the first image line (3) is arranged, and an area (B) where the second image line (4) and the third image line are arranged. As in the printed product (1) in the first embodiment, the gradation difference formed by the first image line (3) is displayed in the second image line (4) in all units (U). Camouflaged and formed so that the total value of the image area of the first image line (3) and the second image line (4) in all the units (U) is the same. By forming the third image line (8) expressing the light and shade, the latent image formed by the first image line (3) and the second image line (4) is hidden in the printed pattern. A visible image formed with or without the third image line (8) is formed.

  Each unit (U) in the second embodiment includes a region (A) having a width of 130 μm and a height of 320 μm where the first image line (3) is formed, the second image line (4), and the second image line (4). A region (B) having a width of 290 μm and a height of 320 μm on which three image lines are formed is arranged adjacently to form a minimum unit (U). The first image line (3) is formed from an image line with a width of 55 μm representing the lowest density of the latent image, with an image line width (W1) with a width of 91 μm representing the highest density. Note that when the line width (W1) of the first line (3) is formed with an image line width of less than 50 μm, the line width is not reproduced depending on the resolution of the copying machine. Can't get. Further, the distance between the first image line (3), the second image line (4), and the third image line (8) formed in each unit (U) needs to be 10 μm or more apart. There is. This is detected as an image line combined with the adjacent first image line (3) by the copying machine, and the second image line (4) and the third image line (8) may not disappear. It is.

  Further, the second image line (4) is formed at a predetermined position in each unit (U), thereby forming an image line regularly formed at a constant pitch, and the third image line (8). ) Is formed at the center position between the second image lines (3) formed in the unit (U) formed adjacent to the vertical direction (S1 direction), so that the second image line (3) is formed. And the third image line (8) are alternately formed at a constant pitch. Since the second image line (4) and the third image line (8) need to be formed with an image line having a size that cannot be reproduced by the copying machine, the image line width (W4) is an image line having a width of 45 μm or less. It is necessary to form, and preferably, it is formed with an image line width of 40 μm or less.

  In the second embodiment, an example in which the second image line (4) and the third image line (8) formed in each unit (U) are regularly formed at a predetermined pitch has been described. However, it is not always necessary to form in a predetermined position, and the line area corresponding to the second line (4) corresponding to the first line (3) formed in each unit (U) is visible. The total value of the image area for the third image line (8) corresponding to the image may be formed in the unit (U). As for the third image line (8), it is desirable to fix the image line width (W4) and change the image line width (W5) in the same manner as the second image line (4).

  For example, as in the printed matter (1) of the first embodiment, the total value of the first image line (3) and the second image line (4) is 22%, and a third image forming a visible image is formed. Assuming that the unit (U) forms the image line (8) with an area of 2%, the sum of the first image line (3), the second image line (4), and the third image line (8). The area ratio is 24%. In the unit (U) having this density, when the first image line (3) is formed at 20%, the second image line (4) is 2% and the third image line (8) is 2%. However, even if the second image line is formed with an image area of 4% and the third image line (8) is not formed, the image line in the unit (U) may be formed. Since the area ratio can be set to 24% and the total area of the image lines not reproduced by the copying machine can be set to 4%, a density for forming a visible image can be obtained and an area ratio of 20% can be obtained for the copy (6). Since the first image line (3) having the above is reproduced, the same effect can be obtained.

  In addition, the second image line (3) and the third image line (8) need to be formed apart by 100 μm or more, including the image line interval (D) formed in the adjacent unit (U). When the second image line (3) and the third image line (8) are formed at a distance of less than 100 μm, the copying machine detects these image lines as one image line, and the copied material. There is a possibility that the total density of the second image line (4) and the third image line (8) is reproduced in (6). Therefore, it is preferable that the intervals between all the second image lines (4) and the third image lines (8) formed in the printed pattern (2) are 100 μm or more apart.

  FIG. 11 shows an image line configuration in the unit (U) of the printed matter (1) in the second embodiment. In the second embodiment, the maximum density in each unit (U), that is, the line area ratio of the unit (U) representing the highest density visible image region is 31%, and the lowest density, that is, the highest density The line area ratio of the unit (U) expressing the visible image portion having a low density is 22%.

  The unit (U) shown in FIG. 11 has a third image line (8) in which a positive image (8a) of a visible image is reproduced with an image line density of 9% and a first image line (3) that forms a latent image. ) And the second image line (4) are combined to form the printed pattern (2). In each unit (U), the first image line (3) and the second image line (4) for camouflaging the latent image and the latent image are formed at a line area ratio of 22% to form a visible image. A visible image is formed by arbitrarily forming the third image line (8) at an image area ratio of 0 to 9%. Note that in the printed matter (1) in the second embodiment, the range of the line area ratio for forming a visible image is 0 to 9%. The range of rates should be expanded.

  Further, in the printed matter (1) in the second embodiment, the maximum density of the unit (U) is 31%, but if it is formed at 45% or less, the effect of the present invention can be obtained. When the maximum density of the unit (U) is an area ratio exceeding 45%, a blank area in the unit (U) (area where the second image line (3) and the third image line (8) are not formed) Is less, it becomes difficult to form the second image line (4) and the third image line (8) that are not reproduced on the copy (6), and the entire printed pattern (2) is high. This is not preferable because the concentration becomes low and the design is impaired.

  FIG. 11 shows a case where the area ratio of the first image line (3) forming the latent image is increased stepwise, and the third image line (8) forming the visible image is changed stepwise. Shows an example of large formation. Here, description of fluctuations in the image area of the first image line (3) and the second image line (4) is omitted, and only the third image line (8) that forms a visible image will be described. . In FIG. 11, gradation is expressed in the range of the line area ratio 9%, and the third line (4) in the unit (U) formed adjacent in the vertical direction is centered on the third line. The image line (8) is formed. From the top, there is no third image line (8), 2%, 4%, 7%, 9% and the third image line (8) step by step. This shows an example in which the area ratio is increased. Note that the third image line (8) only needs to express the shade in accordance with the visible image in each unit (U), and the first image line (3) formed in each unit (U) and The combination with the second image line (4) is not particularly limited.

  In the second embodiment, the example in which the second image line (4) and the third image line (8) are formed at a constant pitch has been described. However, as in the first embodiment, A method of forming the image line (4) and the third image line (8) by a set of halftone dots which are not reproduced by the copying machine, or a plurality of image lines formed with an image line width which is not reproduced by the copying machine. These methods can be used and are within the scope of the present invention.

(Third embodiment)
FIG. 12 is an identification-type printed matter (1) according to the third embodiment, which is a printed matter (1) in which a printed photograph (2) having a face photograph and a copy prevention function is formed on a base material. . In the printed pattern (2), a visible image and a latent image are formed, and a face photograph image (9) and the same latent image image as the face photograph image (9) are formed in the background pattern area.

  The printed pattern (2) includes a first image line (3) formed by increasing / decreasing the image line width in each unit (U) to express the gradation of the latent image, and the first image line. A second image line (4) for camouflaging the gradation of (3) and a third image line (8) for forming a visible image are formed. Note that the configuration of the first image line (3), the second image line (4), and the third image line (8) is the same as that of the printed material (1) of the second embodiment. Description is omitted.

  FIG. 13 shows the copy area (7) formed on the copy (6) in the third embodiment, and the second image line (4) and the third image line (8) are copied. Since it is formed with an image line having a size that cannot be reproduced by the machine, it is not reproduced on the copy (6), and the latent image formed on the first image line (3) is observed. As a result, by confirming whether or not the copy pattern (7) matches the photographic image (9), it is possible to reliably determine whether or not the tampering action is to replace the photographic image (9). .

DESCRIPTION OF SYMBOLS 1 Print 2 Print pattern 3 First image line 3a Copy pattern positive image 4 Second image line 4a Copy pattern negative image 5 Copy machine 6 Copy material 7 Copy pattern 8 Third image line 8a Visible image positive image 9 Photo Image A Region B Region D Line Interval W1 First Image Line Width W2 Second Image Line Width W3 Second Image Line Width W4 Third Image Line Width W5 Line width U unit of the third line

Claims (9)

Having a printing area on at least a part of the substrate;
In the printing area, a plurality of units having at least a latent image area and a camouflage area are regularly formed at a constant pitch,
The latent image area is formed by forming a first image line reproduced by a copying machine,
The camouflage area is formed by forming a second image line that cannot be reproduced by a copier,
The total area of the first image line and the second image line formed in each of the units is formed in the same area in all the units,
An anti-counterfeit printed matter, wherein a latent image having a continuous tone is formed according to the size of the area of the first image line formed in the latent image region.   The first image line has a straight or curved pattern formed by the plurality of first image lines formed in each of the units formed adjacent to each other along the first direction. The printed matter for preventing forgery according to claim 1.   The forgery prevention printed matter according to claim 1 or 2, wherein the second image line is formed by an image line or a pixel.   4. The total area of the first image line and the second image line formed in each of the units is within a range of 15% to 30%. 5. The printed matter for preventing forgery described in 1. The camouflage area further has a third image line that is not reproduced by the copier,
The forgery prevention printed matter according to any one of claims 1 to 4, wherein a visible image is formed by the third image line.   6. The forgery-preventing printed matter according to claim 5, wherein the third image line is formed by an image line or a pixel.   7. The forgery-preventing printed matter according to claim 5, wherein a visible image having a continuous tone is formed by changing an area ratio of the third image line formed in each of the units. .   6. The total area of the first image line, the second image line, and the third image line formed in each of the units is in the range of 15% to 45%. The printed matter for preventing forgery according to any one of Items 1 to 7.   The printed matter for preventing forgery according to any one of claims 1 to 8, wherein the fixed pitch between the units is 1 mm or less.

Images