JP2017128055A - Copy protection printed matter having authenticity discrimination function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter having effects of copy protection and authenticity discrimination.SOLUTION: The printed matter comprises: a background part formed by arraying a plurality of first streaks having a first size reproducible by a copier; a latent image part formed by arraying a plurality of second streaks having a second size unreproducible by a copier; a visible image part formed by alternately arraying a plurality of third streaks having a third size the same as or different from the second size and unreproducible by a copier and the first streaks; and a common image part formed by alternately arraying a plurality of the second streaks and the third streaks. The latent image part and the background part have the same density; the visible image part and the common image part have the same density; and the density of the visible image part and the common image part is higher than the density of the latent image part and the background part. A visible image is composed of the visible image part and the common image part which have the density higher than that of the latent image part and the background part and a latent image is composed of the latent image part and the common image part which have streaks having sizes unreproducible by a copier. Each of the streaks comprises a colored ink which emits light when irradiated with ultraviolet rays.SELECTED DRAWING: Figure 2

Description

  The present invention is true for printed matter that is necessary to prevent counterfeiting or falsification of banknotes, stock certificates, securities such as bonds, various certificates, important documents, etc. The present invention relates to a copy-prevented printed material having a true / false discrimination function that can be falsely identified and can be easily identified as a copied material when copied by a color copying machine or a monochrome copying machine.

  Countermeasures against counterfeiting and falsification are important factors in banknotes, stock certificates, securities such as bonds, various certificates, and printed materials such as important documents. These forgery and falsification prevention measures of these printed materials could not be recognized visually by adding a method and an action to the printed materials, mainly by using a design with a variety of geometric patterns in the design. There is a method in which a latent image appears. Typical examples of the former are tint blocks, color patterns, relief patterns, etc. that are widely used in the design of securities prints, etc., and the latter are typical examples of latent image intaglios and color copiers. There are functional inks that cannot be reproduced, and copy prevention image lines.

  Forgery and tampering prevention measures using the above-mentioned geometric patterns include ground pattern, chromatic pattern, relief pattern, etc., and the pattern is basically composed of a set of curved lines with a fixed line width. is there. These patterns take into account design properties such as the design of printed matter, and can take measures to prevent counterfeiting and tampering. By making the pattern complicated, it is difficult to produce the same pattern on counterfeit products. It plays a role as a counterfeit prevention measure by generating moiré for the scanning input / output of color copiers, monochrome copiers, or scanners by using colors that are difficult to reproduce on copiers or using complex music lines. It is increasing. In addition, the above-mentioned patterns are widely used worldwide in the design of printed securities, etc., and at the same time, they have been used for a long time as printed patterns having monetary value such as banknotes, stock certificates, bonds, etc. It is an important design as a design that gives a sense of luxury. Therefore, in the printed matter such as banknotes, stock certificates, securities such as bonds, various certificates, important documents, etc., 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 that sufficient anti-counterfeiting and tampering prevention effects are not brought about.

  Further, as a representative technique of a method in which a latent image that could not be visually recognized appears by adding some means and action to the above-mentioned printed matter, generally, a copy prevention image line and There is a series of techniques called. 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 the printed material on which the latent image has been applied is copied by a color copying machine or a monochrome copying machine, the densely structured screen pattern that is not reproduced and the reproduced coarsely structured screen pattern are as shown in the copied material pattern. A latent image portion of a dense screen pattern that is not reproduced appears against a coarse screen pattern that is reproduced due to a difference in density so that it can be seen at a glance. It is.

  Also, the applicant of the present application also has a printed matter in which a latent image composed of a pattern such as halftone dots or lines on the surface of a sheet and a background composed of a pattern different in density from the latent image around the latent image are simultaneously printed in one color. As a printed matter suitable for copy prevention, the latent image pattern on which the latent image is applied cannot be identified with the naked eye. A method of camouflaging with an overprinted, non-overlapping circular pattern, or a concentric pattern in which the halftone dot percentage of a partial screen pattern is increased with respect to the entire screen pattern has already been filed (for example, patent document) 1). However, due to the feature that the entire printing surface is a screen pattern, the plate making and printing output apparatuses with high functionality in recent years have a problem that the image line configuration can be easily reproduced.

  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 structure has already been filed that incorporates a background pattern consisting of halftone dots of 175 lines and prints on the paper once. (For example, see Patent Document 2). However, the background pattern consisting of halftone dots of 175 lines and 10% as a whole is enlarged by being partially connected to the lines and halftones that make up the latent image or background. It never disappears completely.

  Therefore, in order to solve these problems, the applicant of the present application has made further improvements in order to make the color copying machine or the monochrome copying machine more effective. Specifically, the curved line pattern is a continuous line of the image line where the latent image is not applied, and the image line of the shape where the image line of the portion where the latent image is applied is arranged at a constant interval in the basic line direction. The image of the part corresponding to one period consisting of one image line part and non-image part continuous in the basic line direction among the fixed period break lines of the part where the latent image is applied. The line area of the portion corresponding to the same length as one cycle consisting of the image line portion and the non-image line portion in the latent image portion, among the continuous lines of the portion where the latent image is not applied, In addition, in the image line that is the periodic break line of the part where the latent image is applied, the image line of the periodic break line intersects with one of the image lines, An application has been filed for a method of creating an anti-copying pattern and its printed matter, which is characterized in that it is deleted within the range of the line width of the other line. (E.g., see Patent Document 3).

  In addition, the applicant of the present application has a copy restraint area in which printed image lines are arranged in at least a part on a substrate, and the copy restraint area has a first size that can be reproduced by a copying machine. The first image line is a plurality of first image lines arranged at a constant pitch, and a latent image is formed by arranging a plurality of second image lines of a second size that cannot be reproduced by a copying machine at the constant pitch. A plurality of third image lines and third image lines having a third size that cannot be reproduced by a copier having the same or different image size as the second image are alternately arranged at the constant pitch. A visible image portion, and a common image portion in which a plurality of the second image line and the third image line are alternately arranged at the constant pitch, the latent image portion, the background portion, and The visible image portion and the common image portion have the same density, and the visible image portion and the common image portion have the densities A visible image is formed by the visible image portion and the common image portion that are formed higher in density than the image portion and the background portion, and higher in density than the latent image portion and the background portion, and cannot be reproduced by a copying machine. An application has been filed for a copy and falsification-preventing printed matter in which a latent image is formed by the latent image portion having the image line and the common image portion (see, for example, Patent Document 4).

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

  However, as shown in Patent Documents 1 to 3, when a printed material is copied with a copying machine, a latent image appears in the copied material, so that it can be easily discriminated whether it is an original printed material or a copied material. Technology. In Patent Document 4, when a printed material having a visible image is copied by a copying machine, the visible image disappears and a latent image appears in the copied material. Therefore, the image changes between the original printed material and the copied material. It is a technology that can be easily distinguished.

  However, although the printed materials of Patent Documents 1 to 4 have a discrimination effect on a copied material copied by a copying machine or the like, there is no means for easily determining whether or not the original printed material is genuine.

  The present invention is intended to solve the above-described problems, and has a discrimination effect on a copy when copied by a copying machine or the like, and can easily determine authenticity of an original print. The present invention proposes a copy-prevented printed material having a true / false discrimination function.

  The anti-copying printed matter having the true / false determination function of the present invention has an authenticity determination area in which print lines are arranged in a line on at least a part of the substrate, and the authenticity determination area is: A background portion in which a plurality of first image lines of a first size that can be reproduced by a copying machine are arranged at a constant pitch, and a second image line of a second size that cannot be reproduced by a copier A plurality of latent image portions arranged at a constant pitch and a third image line and a first image line of a third size that cannot be reproduced by a copier that is the same as or different from the second size are alternately displayed. A plurality of visible image portions arranged at a constant pitch, and a common image portion in which a plurality of second image lines and a third image line are alternately arranged at a constant pitch. The visible image portion and the common image portion have the same density, and the visible image portion and the common image portion have a higher density than the latent image portion and the background portion. A visible image is formed by the visible image portion and the common image portion having a higher density than the latent image portion and the background portion, and the latent image portion is formed by the latent image portion and the common image portion having an image line whose size cannot be reproduced by a copying machine. The total value of the perimeter of the second image line per predetermined area formed in the latent image portion is the perimeter of the first image line per predetermined area formed in the background portion. The total value of the perimeters of the first image line and the third image line per predetermined area formed in the visible image portion and the first value per predetermined area formed in the background portion. Larger than the total value of the perimeters of the image lines, and the total value of the perimeters of the second and third image lines per predetermined area formed in the common image portion, and formed in the background portion. The first image line and the second image line are formed larger than the total value of the image line perimeters of the first image line per predetermined area. The third image line is a printed matter made of colored ink that emits light when irradiated with ultraviolet rays. When the printed matter is observed under visible light, a visible image is visually recognized, and copying is performed when the printed matter is copied with a copying machine. The visible image disappears in the object, the latent image becomes apparent, and both the visible image and the latent image become apparent when the printed matter is irradiated with ultraviolet rays.

  In the copy-prevented printed matter having the true / false discrimination function of the present invention, the second image line and the third image line are formed by break lines in which the image line portion and the non-image line portion are repeated at a constant cycle. The period of the image line part and the non-image line part constituting the second image line is different from the period of the image line part and the non-image line part constituting the third image line.

  The copy-preventing printed material having the authenticity determination function of the present invention has the same area ratio of the background portion and the latent image portion, so that the density of the latent image portion and the background portion is equal, and the area ratio of the visible image portion and the common image portion. Are equal, the density of the visible image portion and that of the common image portion are equal.

  The copy-prevented printed material having the true / false discrimination function of the present invention can be easily identified as a copied material because a latent image appears on the copied material when copied with a copying machine or the like. It is. Furthermore, it is possible to determine whether the visible image and the latent image are actualized by irradiating the anti-copying printed matter having the authenticity determination function of the present invention with ultraviolet rays. Therefore, the copy-prevented printed material having the true / false discrimination function of the present invention has both the anti-copying effect and both the true / false discrimination effect of the original printed material.

The figure which shows the structure of each image part in the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the image observed under visible light of the copy-proof printed matter provided with the authenticity discrimination function, the image observed in the copied copy, and the image observed by irradiating ultraviolet rays The figure which shows the density relationship before copying with the image line arrangement in the area for authenticity determination The figure which shows the density relation after copying with the line arrangement in the area for authenticity determination The figure which shows the structure of the background part in the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the structure of the latent image part in the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the structure of the boundary part of a background part and a latent-image part in the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the structure of the visible image part in the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the structure of the common image part in the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the state of each image part when copying the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the state of each image part at the time of irradiating ultraviolet rays to the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the state before copying in another aspect of the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the state after the copy in another aspect of the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the state which irradiated the ultraviolet-ray in another aspect of the copy prevention printed matter provided with the authenticity discrimination function The figure which shows the structure of each image part of the copy prevention printed matter provided with the authenticity discrimination function of Example 1. The figure which shows the structure of each image part of the copy prevention printed matter provided with the authenticity determination function of Example 2. The figure which shows the structure of each image part of the copy prevention printed matter provided with the authenticity discrimination function of Example 3.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims. In addition, the numerical value of the Example described below is an example, and does not limit this invention.

  EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated in detail below with reference to drawings based on an Example. FIG. 1 shows a copy-prevented printed material (1) having a true / false discrimination function according to the present invention. As shown in FIG. 1A, the anti-copying printed matter (1) having a true / false discrimination function has a true / false discrimination area (3) on at least a part of the substrate (2), The print image lines (4) are arranged in a line in the authenticity determination area (3). Although the detailed configuration of the print image line (4) arranged in the authenticity determination area (3) will be described later, the authenticity determination area (3) has a different configuration as shown in FIG. The print image line (4) is composed of the respective parts arranged.

  Details of each part constituted by different print lines will be described with reference to FIGS. First, in this example, it is assumed that the visible image (9) is “star” and the latent image (10) is “moon”. FIG. 1 (c) shows the background portion (8) as the background of the visible image (9) and the latent image (10), and FIG. 1 (d) shows only the image lines constituting the latent image (10). The latent image portion (6), FIG. 1 (e) shows the visible image portion (5) formed only by the image lines constituting the visible image (9), and FIG. 1 (f) shows the visible image portion (6). The image (9) and the latent image (10) form a common image portion (7) in an overlapping area. The authenticity determination area (3) includes a visible image (9) composed of a visible image portion (5) and a common image portion (7), and a latent image portion (6) and a latent image portion (7). An image (10) is provided.

  For convenience of explanation, in the authenticity determination area (3) shown in FIG. 1, symbols of “star” and “moon” are visually recognized, but an image observed under visible light is shown in FIG. As shown in (a), the background portion (8) and the latent image portion (6) have the same density, and the visible image portion (5) and the common image portion (7) have the same density. The densities of the visible image portion (5) and the common image portion (7) are observed to be higher than the densities of the background portion (8) and the latent image portion (6). Thereby, as shown to Fig.2 (a), the pattern of the "star" of the visible image (9) observed under visible light can be visually recognized.

  FIG. 2 (b) shows a copy (11) obtained by copying the copy-preventing printed material (1) having the authenticity determination function shown in FIG. 2 (a) with a color copying machine or a monochrome copying machine. Is. In the authenticity determination area (12) in the copy (11), the visible image portion (5) and the background portion (8) have the same density, and the latent image portion (6) and the common image portion (7) The density of the latent image portion (6) and the common image portion (7) is observed to be lower than the density of the background portion (8) and the visible image portion (5). As a result, as shown in FIG. 2B, when the copy (11) is observed under visible light, the symbol of the “moon” of the latent image (10) can be visually recognized, and the authenticity determination is made. In a copy (11) obtained by copying a copy prevention print (1) having a function by a color copying machine or a monochrome copying machine, the visible image (9) and the latent image (10) are completely switched. It will make a change. As described above, the copy-prevented printed material (1) having the true / false discrimination function of the present invention can be clearly changed even if the visible image (9) and the latent image (10) partially overlap. , The authenticity is improved.

  FIG. 2 (c) shows a copy provided with a true / false discrimination function when the copy-prevented printed matter (1) shown in FIG. 2 (a) is observed by irradiating with ultraviolet rays. The prevention printed matter (1) is shown. In the authenticity determination area (12) in the copy-proof printed matter (1) having the authenticity determination function, the emission intensity of the visible image portion (5), the latent image portion (6), and the common image portion (7) is the background. It is observed stronger than the emission intensity of the part (8). As a result, as shown in FIG. 2 (c), when the copy-prevented printed matter (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays, the “star” symbol and the latent image of the visible image (9) Both the “moon” symbols of the image (10) can be visually recognized, and authenticity can be determined. Hereinafter, a detailed configuration of the copy-prevented printed matter (1) having the authenticity determination function of the present invention will be described.

  First, the arrangement relationship between the image lines constituting the authenticity determination area (3) will be described with reference to FIG. The detailed configuration of each image line will be described later.

  As shown in FIG. 3, the four drawing lines are arranged on the center line (L1) and the center line (L2) alternately arranged at equal intervals. Note that the center line here is a virtual line to be considered when producing a printed material, and is not a line actually described on the printed material. The distance between the center line (L1) and the center line (L2) is preferably 150 to 300 μm.

  In FIG. 3A, a solid line having a size that can be reproduced by the copying machine is arranged on the center line (L1), and the center line (L2) is not arranged and nothing is drawn. Details of the definition of the size that can be reproduced by the copying machine or the size that cannot be reproduced will be described later.

  In FIG. 3B, an image line that is in a broken line state is arranged on the center line (L1), and the center line (L2) is a non-image line without arranging anything.

  In FIG. 3C, the same solid line as FIG. 3A is arranged on the center line (L1), and the longer side is slightly longer than the fracture line arranged in FIG. 3B on the center line (L2). A break line with a short direction is arranged. Note that the break line shown in FIG. 3C is a break line that is slightly shorter in the longer side direction than the break line shown in FIG. 3B as described above, but it is essential to make it different. Rather, they may be the same. What is important is that the size cannot be reproduced by the copying machine and the size contributes to the density adjustment based on the relationship with other image lines. Details thereof will be described later in the description of each image line configuration.

  In FIG. 3 (d), an image line in the same broken line state as in FIG. 3 (b) is arranged on the center line (L1), and the same broken line as in FIG. 3 (c) is arranged on the center line (L2). An image line that is in a state is placed.

  3A and 3B can be visually recognized at the same density visually, and FIG. 3C and FIG. 3D are based on the arrangement of each image line. ) Can be visually recognized at an equal density. The reason why FIG. 3 (a) and FIG. 3 (b) and FIG. 3 (c) and FIG.

  When the pattern of each image line in this arrangement is reproduced by a copying machine, the state becomes as shown in FIGS. In FIG. 4A, the area drawn with a solid line is reproduced as it is by a copying machine. In FIG. 4B, the line drawn by the broken line cannot be reproduced by the copying machine, and no drawing line is drawn. In FIG. 4 (c), the same solid line area as in FIG. 4 (a) is reproduced as it is, and the area drawn with a broken line is not reproduced, so only the solid line state is obtained. It is reproduced in the same state. Further, in FIG. 4D, since two broken lines are not reproduced by the copying machine, no image line is drawn, and the state is the same as that in FIG.

  As described above, the basic principle of the present invention is that each of the two image portions is classified because the two image portions are visually recognized as equal in density among the image portions having four different image line configurations. However, if the image is reproduced by a copying machine, two image portions different from those at the time of visual observation are reproduced in the same state (equal density). Therefore, the two image portions in the same state cannot be distinguished.

  Next, the details of the image lines constituting the four image portions in the authenticity determination area (3) will be specifically described.

(Background)
FIG. 5 is a partially enlarged view of the background portion (8). The print image line arranged in the background portion (8) is a first image line (13 having a first size that can be reproduced by a copying machine). The background portion (8) is formed by regularly arranging a plurality of first image lines (13) at a constant pitch (P1). At this time, the width (W ₁₃ ) of the first image line (13) is formed in the first size that can be reproduced by the copying machine. The first size is 50 μm or more as the size to be copied, although it depends on the performance of the copying machine.

The print image lines constituting the four image portions in the present invention will be described using the expression of the size of the image line whether or not it can be reproduced by a copying machine. This means the width in the short side direction in the drawing line. Therefore, the first size of the first image line (13) in FIG. 5 is the image line width (W ₁₃ ) in the short side direction of the first image line ( ₁₃ ). Further, in the case of the second image line (14) composed of a broken line as shown in FIG. 6 described later, the image line width of the second image line (14) is (Wy ₁₄ ). Since the line width (Wx ₁₄ ) of each broken line constituting the second image line ( ₁₄ ) is a size that cannot be reproduced by a copying machine, it is referred to in the present invention. , The size of the stroke. Accordingly, in the present invention, the size of an image line indicating whether or not it can be reproduced by a copying machine refers to the width of each image line in the short side direction.

With the above configuration, the background portion (8) is formed with the first area ratio by arranging a plurality of first image lines (13) having a width (W ₁₃ ) at a constant pitch (P1). In the present invention, the area ratio is the ratio of the area of the image line arranged in a certain area of the substrate (2). In this example, the first image line (13) is a solid line. However, in the present invention, the first image line (13) is a straight line as long as it has a size reproducible by a copying machine. There is no limitation on the shape, such as a curve or a wavy line.

(Latent image part)
FIG. 6 is a partially enlarged view of the latent image portion (6). The print image line arranged in the latent image portion (6) is a second image having a second size that cannot be reproduced by a copying machine. The latent image portion (6) is a line (14), and the second image line (14) is regularly arranged at a constant pitch (P1), and the area ratio of the background portion (8) It is composed of equal first area ratios.

The second image line (14) shown in FIG. 6 (a) is an example in which the image line part (14a) and the non-image line part (14b) are constituted by broken lines that are repeated at a constant period (D _x14 ). is there. At this time, the width of the image line portion in the direction in which the print image lines are arranged at a constant pitch (P1) is (Wy ₁₄ ), and is the direction of the print image line, that is, the width of the image line portion in the breaking line direction. the When _{(Wx 14),} it is formed by a second magnitude that the width of the image area _{(Wx 14)} can not be reproduced by the copying machine. The second size is smaller than 50 μm as a size that is not copied, although it depends on the performance of the copying machine. The smaller the period (D _x14 ) between the image line portion and the non-image line portion, the closer the image line portions (14a) are to each other and the easier it is to copy with the copying machine. Therefore, it is necessary to appropriately adjust the period (D _x14 ) between the image area and the non-image area so that the image is not reproduced by the copying machine. At the same time, in order to equalize the area ratio of the latent image portion (6) and the background portion (8), the image area of the second image line (14) is changed according to the area ratio of the background portion (8). It is necessary to appropriately adjust the width (Wx ₁₄ , Wy ₁₄ ) and the period (D _x14 ) of the image area and the non-image area.

FIG. 6A is a partially enlarged view of the latent image portion (6), so that the image line portion (14a) and the non-image line portion (14b) can be distinguished and visually recognized. When the copy-prevented printed matter (1) having a false discrimination function is visually observed, the second size and the period (D _x14 ) are small, so that they cannot be visually discriminated and placed in the latent image portion (6). The drawn image line (portion surrounded by a broken line in FIG. 6) is visually recognized as one image line. It is to be noted that the first image line (13) according to the present invention and the first image line (14) according to the present invention are arranged respectively. A configuration for equalizing the area ratios of the image portion (8) and the second image portion (6) is well known in Japanese Patent No. 3268418 and the technology of copy prevention image lines.

  In addition, when the 2nd drawing line (14) is comprised with a broken line, as shown in FIG.6 (b) with respect to the broken line shown to Fig.6 (a), the drawing line part (14a) is inclined. It is good also as a structure. In this example, the second image line (14) is arranged in a broken line shape, but if it has a size that cannot be reproduced by a copying machine, it is arranged in the long side direction. A branched line shape may be used. This configuration is a technique described in Japanese Patent No. 3368327, and details will be described in a second embodiment. In addition, the configuration of the second image line (14) is branched from a single image line described in Japanese Patent No. 3688786 into a plurality of image lines, and the image line portion and the non-image line portion are arranged at regular intervals. The configuration may be a constant periodic disconnection line, and details will be described in the third embodiment.

  In this example, as shown in FIG. 7, at the boundary portion between the background portion (8) and the latent image portion (6), the first image line (13) arranged in the background portion (8) and the latent image portion. A configuration in which the second image line (14) arranged in (6) is arranged on the same line will be described. The first image line (13) and the second image line (14) are arranged in the same line shape as the center line (T) of each image line illustrated by a one-dot chain line in FIG. That is. The relationship between the first image line (13) and the second image line (14) is the same as that of the copy prevention image line described in Japanese Patent No. 3268418. At this time, since the first image line (13) and the second image line (14) are visually seen as one straight image line, the most excellent form for concealing the formation of the latent image. It is.

  The principle of observing the visible image (9) under visible light will be described later. In the present invention, the positions of the center lines of the first image line (13) and the second image line (14) are different. Even in the arrangement, there is no problem as long as the latent image (10) cannot be recognized. This is because, even if the positions of the centers of the first image line (13) and the second image line (14) are different, the position of the center line observed under visible light is different, so that the latent image to be visualized is visualized. This is because the visibility of the visible image (9) due to the difference in area ratio is stronger than the image image (10), and the latent image (10) is difficult to recognize.

(Visible image part)
FIG. 8 is a partially enlarged view of the visible image portion (5), and the print image line arranged in the visible image portion (5) is the same as the first image line (13) and the second size or A third image line (15) of a third size that cannot be reproduced by a copier of a different size, and the first image line (13) and the third image line (15) have a constant pitch. A plurality of (P1) are regularly and alternately arranged. The configuration of the first image line (13) is as described above.

The third image line (15) shown in FIG. 8 is an example in which the image line part (15a) and the non-image line part (15b) are constituted by broken lines that are repeated at a constant period (D _x15 ). At this time, the width of the image line portion in the direction in which the print image lines are arranged at a constant pitch (P1) is defined as (Wy ₁₅ ), and is the direction of the print image line, that is, the image line portion in the direction of the break line. When the width is (Wx ₁₅ ), the width (Wx ₁₅ ) of the image line portion is formed in a third size that cannot be reproduced by the copying machine. The third size is smaller than 50 μm as a size that is not copied, although it depends on the performance of the copying machine. That is, the configuration of the third image line (15) is the same as the configuration of the second image line (14), but the third size for preventing the third image line (15) from being reproduced by the copying machine. The thickness may be different from the second size as long as it is smaller than 50 μm.

The visible image portion (5) is formed with a second area ratio that is higher than the first area ratio by arranging the first image line (13) and the third image line (15). Has been. At this time, the period (D _x15 ) of the image line part (15a) and the non-image line part (15b) constituting the third image line (15) is the image line part constituting the second image line (14). Although it is desirable to prevent the moire of the visible image (9) observed under visible light, it is preferable that the pitch is different from the period (D _x14 ) of (14a) and the non-image portion (14b). Also good. In this example, the third image line (15) is arranged in a broken line shape. However, if the image has a size that cannot be reproduced by a copying machine, Similarly to the image line (14), a branched image line described in Japanese Patent No. 3368327 or a branched periodic break line described in Japanese Patent No. 3688786 may be used.

(Common image part)
FIG. 9 is a partially enlarged view of the common image portion (7). The print image lines arranged in the common image portion (7) are the second image line (14) and the third image line (15). The second image line (14) and the third image line (15) are regularly and alternately arranged at a constant pitch (P1). The configurations of the second image line (14) and the third image line (15) are as described above. In FIG. 9A, the second image line (14) and the third image line (15) are constituted by broken lines, and the image line portion (14a) constituting the second image line (14) is not The period (D _x14 ) of the image line part (14b) is the same as the period (D _x15 ) of the image line part (15a) and the non-image line part (15b) constituting the third image line (15). ing. As described above, as shown in FIG. 9B, the period (D _x15 ) of the image line part (15a) and the non-image line part (15b) constituting the third image line (15), and the second The moiré of the visible image (9) that is observed under visible light is different when the period (D _x14 ) of the image area (14a) and the non-image area (14b) constituting the image line (14) is different. Is unlikely to occur. The common image portion (7) is formed to have a higher area ratio than the first area ratio by arranging the second image line (14) and the third image line (15).

  In the common image portion (7) and the visible image portion (5), the area ratio of each image portion by the third image line (15) is the same, and the visible image portion (13) by the first image line (13) ( The area ratio of 5) and the area ratio of the common image portion (7) by the second image line (14) are also the same. Therefore, the area ratio of the common image portion (7) is equal to the second area ratio in the visible image portion (5).

  Next, when a copy-prevented printed matter (1) having a true / false discrimination function, which is a feature of the present invention, is observed by irradiating with ultraviolet rays, a “star” pattern and a latent image ( A configuration for making both of the “Month” symbol 10) visible will be described. In the authenticity determination area (12) of the copy-proof printed matter (1) having the authenticity determination function, both the “star” symbol of the visible image (9) and the “moon” symbol of the latent image (10). Is visible, the light emission intensity of the visible image part (5), the latent image part (6) and the common image part (7) needs to be observed stronger than the light emission intensity of the background part (8). is there. In order to realize this function, the printed image line (4) formed in the authenticity determination area (3) is a color material having a color different from that of the base material (2) and is irradiated with ultraviolet rays. It is necessary to print with colored ink that emits light. Further, the total value of the image line perimeter (V2) of the second image line (14) per predetermined area formed in the latent image part (6) shown in FIG. It is necessary to be larger than the total value of the image perimeter (V1) of the first image line (13) per predetermined area formed in 8), and is formed in the visible image portion (5) shown in FIG. The total value of the perimeter length (V3) of the first image line (13) and the third image line (15) per predetermined area and the predetermined value formed in the background portion (8) shown in FIG. It must be larger than the total value of the image perimeter (V1) of the first image line (13) per area, and per predetermined area formed in the common image portion (7) shown in FIG. The total perimeter length (V4) of the second image line (14) and the third image line (15) and the predetermined area formed on the background (8) shown in FIG. Than the sum of image line peripheral length of the first image line (13) (V1), there is great need. Further, in order to provide the above-described copy prevention effect, the image line design of the first image line (13), the second image line (14), and the third image line (15) has been described above. It is necessary to form under conditions.

(Visible image)
The authenticity determination area (3) composed of the background part (8), latent image part (6), visible image part (5) and common image part (7) described above is shown in FIG. The visible image (9) which is a symbol of “star” is formed by the visible image portion (5) having the second area ratio and the common image portion (7). Since the visible image portion (5) and the common image portion (7) are configured with a second area ratio that is higher than the first area ratio, the area in the authenticity determination region (3) A density difference due to the difference in rate occurs, and the visible image (9) can be observed under visible light.

(Latent image)
The latent image (10), which is the “moon” symbol shown in FIG. 2 (b), has a second image line (14) that is an image line having a size that cannot be reproduced by the copying machine. Part (6) and a common image part (7) having a second image line (14) and a third image line (15) which are image lines of a size that cannot be reproduced by a copying machine. . Next, the principle of appearance of the latent image (10) when copied by a copying machine and the principle of appearance of the visible image (9) and latent image (10) when irradiated with ultraviolet light will be described.

  FIG. 2B shows a state in which the copy-prevented printed material (1) having the authenticity determination function shown in FIG. 2A is copied by a color copying machine or a monochrome copying machine. When the authenticity determination area (12) in the copy (11) of b) is enlarged, four image portions each having different print image lines as shown in FIG. 10 are obtained.

  In the background portion (8) in the copy shown in FIG. 10A, the first image line (13) is almost reproduced. In the latent image portion (6) in the copy shown in FIG. 10 (b), the broken line-shaped second image line (14) is formed with a size smaller than 50 μm. Due to the limitations of this, it cannot be read into a copier and is not reproduced. In the visible image portion (5) in the copy shown in FIG. 10 (c), the first image line (13) is reproduced almost as it is, but the broken line-shaped third image line (15) is also reproduced. Like the second image line, it is not reproduced because it is formed with a size smaller than 50 μm. Further, the common image portion (7) in the copy shown in FIG. 10D has a size in which the broken line-shaped second image line (14) and the third image line (15) are smaller than 50 μm. It is not reproduced because it is formed by.

  As a result, the background portion (8) and the visible image portion (5) are visually observed as almost the same density because the first image line (13) is reproduced almost as it is, and the common image with the latent image portion (6). The part (7) includes a latent image part (6) in which the second image line (14) and the third image line (15) are not reproduced and the second image line (14) not reproduced is arranged, A latent image (10) composed of a common image portion (7) having a second image line (14) and a third image line (15), which are image lines of a size that cannot be reproduced by a copying machine. Visible.

  When the anti-copying printed matter (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays, the “star” symbol of the visible image (9) and the “moon” symbol of the latent image (10) are observed. A configuration for making both of these visible will be described. As described above, in order to make both the “star” symbol of the visible image (9) and the “moon” symbol of the latent image (10) visible, the visible image portion (5), the latent image portion The light emission intensity of (6) and the common image part (7) needs to be observed stronger than the light emission intensity of the background part (8). The total value of the image line perimeter (V2) of the second image line (14) per predetermined area formed in the latent image part (6) shown in FIG. 6 is the background part (8) shown in FIG. The predetermined value formed in the visible image portion (5) shown in FIG. 8 needs to be larger than the total value of the perimeters (V1) of the first image line (13) per predetermined area formed in The total value of the perimeter length (V3) of the first image line (13) and the third image line (15) per area and the predetermined area formed in the background portion (8) shown in FIG. Must be larger than the total value of the perimeter lengths (V1) of the first image lines (13), and the second per predetermined area formed in the common image portion (7) shown in FIG. The total value of the perimeter (V4) of the image line (14) and the third image line (15) and the first per predetermined area formed in the background part (8) shown in FIG. Than the sum of image line peripheral length of the line (13) (V1), there is great need. This is because, as shown in FIG. 11, when the ultraviolet ray is irradiated, the image line itself naturally emits fluorescence, but since the region (18) in which the light emission affects the periphery of the image line is included, the image line perimeter per predetermined area. The longer the is, the stronger the emission intensity.

  The embodiment described above is an example in which the respective image portions illustrated in FIG. 1B are relatively clearly divided to form the visible image (9) and the latent image (10). Is shown below.

  In FIG. 12, a tint block pattern (17) is formed as a visible image (9) on the entire surface in the authenticity determination area (3) of the copy-prevented printed matter (1) having the authenticity determination function. The image lines and each image portion constituting the tint block pattern (17) will be described in detail below.

  In the tint block pattern (17), as shown in FIG. 12, a latent image (10) of characters “P” is formed. In the drawing, the letter “P” is suggested by a dotted line, but it is not actually recognized. The first image line (13), the second image line (14), and the third image line in the area (P2) constituting the latent image (10) and the other area (P1). The visible image portion (5), the latent image portion (6), the common image portion (7), and the background portion (8) are configured using (15).

  First, the image line configuration of the region (P1) other than the latent image (10) will be described. As shown in the enlarged view of one pattern (P1) of the tint block pattern (17), the area where only the first image line (13), which is a solid line, is arranged is the background portion (8). The area where the first image line (13) and the third image line (15) having a broken line shape are alternately arranged is the visible image portion (5).

  The visible image portion (5) has a larger area ratio and a longer image perimeter than the background portion (8). That is, since the visible image portion (5) has a higher apparent density than the background portion (8), the region of the tint block pattern (17) composed of an arbitrary design is configured by the visible image portion (5). And some pattern is recognized by the observer.

  Next, the region (P2) constituting the character “P” that becomes the latent image (10) will be described. As shown in the enlarged view of (P2), the area where only the second line (14) having a broken line shape different from the third line (15) is arranged becomes the latent image portion (6). A region where the second image line (14) and the third image line (15) other than that are alternately arranged is the common image portion (7). The latent image portion (6) and the common image portion (7) have a longer perimeter of the image line than the background portion (8).

  The visible image portion (5) has a larger area ratio than the latent image portion (6). That is, since the common image portion (7) has a higher visual density than the latent image portion (6), the region of the tint block pattern (17) composed of an arbitrary design is configured by the visible image portion (5). Thus, some pattern is recognized by the observer.

  FIG. 13 shows a copy (11) obtained by reproducing a copy prevention print (1) having a true / false discrimination function in which each image portion is formed with the image line configuration as described above, by a copying machine. As shown in FIG. 13, the character “P” in the latent image (10) is confirmed in a white state. Since both the second image line (14) and the third image line (15) constituting the character “P” were composed of broken lines that could not be reproduced by the copying machine, It is not reproduced by a copying machine, and is in a white state.

  In the area other than the letter “P” in the latent image (10), the third image line (15) having a size that cannot be reproduced by the copying machine disappears without being reproduced, and is reproduced by the copying machine. Since only the first image line (13) having a possible size is reproduced and only a flat solid line is obtained, the background pattern (17) is not reproduced.

  Accordingly, in the authenticity determination area of the copy-prevented printed matter (1) having the authenticity determination function of this form, a visible image of the copy-forgery-inhibited pattern (17) is visually recognized before copying. The visible image (9) in (17) disappears, and the character “P” in the latent image (10) appears, and the visible image (9) and the latent image (10) are switched. Will be played.

  Further, FIG. 14 shows a case where the copy-prevented printed material (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays. As shown in FIG. 14, the background pattern (17) as the visible image portion (5) and the letter “P” as the latent image (10) are confirmed in a state where the emission intensity is stronger than the background portion (8). Is done. The perimeter of the image line per predetermined area of the second image line (14) and the third image line (15) constituting the character "P" is the second image line constituting the background part (8). Since it is longer than the perimeter of the image line per predetermined area of one image line (13), the letter “P” can be confirmed in a state where the emission intensity is higher than that of the background part (8). Similarly, the perimeter of the third image line (15) constituting the tint block pattern per predetermined area is the predetermined area of the first image line (13) constituting the background portion (8). Since it is longer than the perimeter of the winning image line, the tint block pattern can be confirmed in a state where the emission intensity is higher than that of the background portion (8).

  As described above, the copy-prevented printed matter (1) having the authenticity determination function according to the present invention has the common image portion (7) that contributes to the visibility of the visible image (9) with visible light, and the copying machine. When copied, it disappears and contributes to the visualization of the latent image (10), so that it is possible to clearly change the image that can be visually recognized in the same area, which was impossible with the prior art. Excellent authenticity for copying. Further, when the anti-copying printed matter (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays, both the visible image (9) and the latent image (10) can be visually recognized. It is possible to determine whether the printed material is genuine or not. Therefore, the copy-prevented printed material having the true / false discrimination function of the present invention has both the anti-copying effect and both the true / false discrimination effect of the original printed material.

  The printing method for producing the anti-copying printed matter (1) having the true / false discrimination function of the present invention is any printing such as offset printing, flexographic printing, letterpress printing, gravure printing, screen printing, intaglio printing and ink jet printing. It can be formed by a method.

  Hereinafter, according to the embodiment for carrying out the present invention, an example of a copy-prevented printed material having a function of authenticating authenticity will be described in detail. However, the present invention is limited to this example. is not.

  In the first embodiment, the first image line (13) is formed by a straight line, and the second image line (14) and the third image line (15) are formed by a broken line. It is prevention printed matter (1). The configuration of each image unit will be described using the same example as the configuration shown in FIG. FIG. 15 is a partially enlarged view of the authenticity determination area (3) in the copy prevention printed matter (1) having the authenticity determination function of the first embodiment.

In the first image line (13) arranged in the background part (8) and the visible image part (5), a plurality of linear image lines having an image line width (W ₁₃ ) of 50 μm are arranged at a pitch of 450 μm. . At this time, the first area ratio in the background portion (8) is about 11%. The second image line (14) arranged in the latent image part (6) and the common image part (7) has an image line part width (Wy ₁₄ ) of 207 μm in the direction in which the print image line is arranged, A plurality of break lines having a width (Wx ₁₄ ) of the image line part in the direction of the break line of 35 μm and a period (D _x14 ) of the image line part and the non-image line part 145 μm arranged at a pitch of 450 μm. At this time, the area ratio in the latent image portion (6) is about 11%, similar to the first area ratio in the background portion (8). Here, the perimeter length of the image line consisting of the first image line (13) of the background portion (8) per unit area having a side of 450 μm is 1000 μm, and the second image line (14) of the latent image portion (6). ) Is approximately 1452 μm, and the image line perimeter per unit area is larger in the latent image portion (6) than in the background portion (8).

The third image line (15) arranged in the visible image part (5) and the common image part (7) has an image line part width (Wy ₁₅ ) of 120 μm in the direction in which the print image line is arranged, A plurality of break lines having a width (Wx ₁₅ ) of the image line part in the direction of the break line of 35 μm and a period (D _x15 ) of the image line part and the non-image line part being 155 μm were arranged at a pitch of 450 μm. The third image line (15) is alternately arranged with the first image line (13) and the second image line (14), and the first image line (13) and the second image line (14) are arranged alternately. The distance between the center line of the third image line (15) and the center line of the line (14) was 225 μm. The visible image portion (5) and the common image portion (7) have a higher area ratio than the background portion (8) and the latent image portion (6) because the third image line (15) is formed. The area ratio of 2 is about 17%. Here, the perimeter length of the image line consisting of the first image line (13) of the background portion (8) per unit area having a side of 450 μm is 1000 μm, and the first image line (13 of the visible image portion (5)). ) And the third image line (15) is about 1930 μm, and the image area per unit area is larger in the visible image part (5) than in the background part (8). become. Also, the perimeter of the image line consisting of the first image line (13) of the background portion (8) per unit area of 450 μm per side is 1000 μm, and the second image line (14) of the common image area (7). And the third image line (15) is approximately 23820 μm, and the image line perimeter per unit area is larger in the common image area (7) than in the background area (8). Become.

  The copy-prevented printed matter (1) having the authenticity determination function of Example 1 formed with the above configuration has a visible image portion (5) formed with a second area ratio when observed under visible light. The “star” symbol composed of the common image portion (7) can be visually recognized, and when the image is copied by a copying machine, the lines of the latent image portion (6) and the common image portion (7) are not reproduced. By reproducing only one image line (13), an effect of visually recognizing the “moon” symbol was obtained. Further, when the copy-prevented printed matter (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays, the visible image portion (5), the latent image portion (6) and the common image portion (7) The luminous intensity was visually recognized higher than in (8), and an effect of being able to visually recognize both the “star” symbol and the “moon” symbol was obtained.

  In Example 2, the first image line (13) is formed by a straight line, and the second image line (14) and the third image line (15) are formed by branch lines described in Japanese Patent No. 3368327. It is a copy prevention printed matter (1) provided with the false discrimination function. The configuration of each image unit will be described using the same example as the configuration shown in FIG. FIG. 16 is a partially enlarged view of the authenticity determination area (3) in the copy prevention printed matter (1) having the authenticity determination function of the second embodiment.

In the first image line (13) arranged in the background part (8) and the visible image part (5), a plurality of linear image lines having an image line width (W ₁₃ ) of 50 μm are arranged at a pitch of 450 μm. . At this time, the first area ratio in the background portion (8) is about 11%. The second image line (14) arranged in the latent image portion (6) and the common image portion (7) is composed of two branched linear image lines (14A, 14B), and is a print image line. The image line width (Wy ₁₄ ) in the direction in which the image is arranged is 25 μm, and the image line interval (Dy ₁₄ ) is 50 μm. That is, in Example 2, the sum of the width (Wy ₁₄ ) of the two branched image lines constituting the second image line (14) with respect to the image line width (W ₁₃ ) of the first image line. Are in the same relationship. Thereby, the area ratios of the background portion (8) and the latent image portion (6) are the first area ratios equal to each other. Here, the perimeter length of the image line consisting of the first image line (13) of the background portion (8) per unit area having a side of 300 μm is 700 μm, and the second image line (14 of the latent image portion (6)) (14). ) Is about 1300 μm, and the image line perimeter per unit area is larger in the latent image portion (6) than in the background portion (8).

The third image line (15) arranged in the visible image part (5) and the common image part (7) is also configured in the same manner as the second image line (14), and the direction in which the print image line is arranged. The image line width (Wy ₁₅ ) was set to 25 μm, and the image line interval (Dy ₁₅ ) was set to 50 μm. Note that, when the second image line (13) and the third image line (14) are configured as branch lines described in the second embodiment, the image line width (Wy ₁₄ ) and the image line width (Wy ₁₅ ). Need not be smaller than 50 μm in order not to be reproduced by a copying machine. Also, if the third image line (15) can be alternately arranged with respect to the first image line (13) and the second image line (14), the space between the image lines (Dy _14). ) And the line interval (Dy ₁₅ ) may have different sizes. Here, the perimeter length of the image line consisting of the first image line (13) of the background portion (8) per unit area having a side of 300 μm is 700 μm, and the first image line (13 of the visible image portion (5)). ) And the third image line (15) is about 2000 μm, and the image area per unit area is larger in the visible image part (5) than in the background part (8). become. The perimeter of the image line consisting of the first image line (13) of the background part (8) per unit area of 300 μm per side is 700 μm, and the second image line (14) of the common image area (7). And the line perimeter of the third image line (15) is about 2000 μm, and the image line perimeter per unit area is larger in the common image part (7) than in the background part (8). Become.

  The anti-copying printed matter (1) having the authenticity discrimination function of Example 2 formed with the above configuration can visually recognize the “star” symbol when observed under visible light as in Example 1. When copying with a copying machine, the effect of being able to visually recognize the “Moon” symbol was obtained. Further, when the copy-prevented printed matter (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays, the visible image portion (5), the latent image portion (6) and the common image portion (7) The luminous intensity was visually recognized higher than in (8), and an effect of being able to visually recognize both the “star” symbol and the “moon” symbol was obtained.

  In the printed matter of Example 3, the first image line (13) is formed as a straight line, and the second image line (14) and the third image line (15) are formed as one image described in Japanese Patent No. 3688786. A copy-preventing printed matter (1) having a true / false discrimination function that is formed by a periodic break line in which a line portion and a non-image portion are arranged at regular intervals, branching from a line to three lines. is there. The configuration of each image unit will be described using the same example as the configuration shown in FIG. FIG. 17 shows a partially enlarged view of the authenticity determination area (3) in the copy-prevented printed matter (1) having the authenticity determination function of the third embodiment.

The first image line (13) arranged in the background portion (8) and the visible image portion (5) includes a plurality of linear image lines having an image line width (W ₁₃ ) of 57.5 μm at a pitch of 450 μm. Arranged. At this time, the first area ratio in the background portion (8) is about 13%. The second image line (14) arranged in the latent image portion (6) and the common image portion (7) is composed of three branched image lines (14A, 14B and 14C). The three branched lines here are in a state where a plurality of broken lines are arranged on a straight line. In FIG. 15, three broken lines arranged on a straight line are arranged in parallel. It is in a state. The branched image lines (14A, 14B, and 14C) have a configuration of a periodic break line in which the image line portion and the non-image line portion are repeated at a constant interval (D _x14 ). In addition, the image line part which comprises the branched image line (14A, 14B, and 14C) is the width ( _Wx14 ) of the image line part in the direction of a breaking line, and the width of the image line part in the direction where a print image line is arranged. The square (Wy ₁₄ ) was 45 μm, and the interval (D _x14 ) between the image line portions was 105 μm. The interval (D _y14 ) between the branched image line (14A) and the image line (14C) was 45 μm. Here, the perimeter of the image line consisting of the first image line (13) of the background part (8) per unit area of 450 μm per side is 1015 μm, and the second image line (14 of the latent image part (6)) ) Is about 1620 μm, and the image line perimeter per unit area is larger in the latent image portion (6) than in the background portion (8).

The third image line (15) arranged in the visible image part (5) and the common image part (7) is also configured in the same manner as the second image line (14), and branched image lines (15A, 15B). 15C) is a square whose width (W _x15 , W _y15 ) is 45 μm, and the distance (D _x15 ) between the image line portions is ₁₀₅ μm. The interval (D _y15 ) between the branched image line (15A) and the image line (15C) was 45 μm. Note that, when the second image line (14) and the third image line (15) have the branched break line configuration described in the third embodiment, the width (Wx ₁₄ ) of the image line portion and the image line portion are described. The width (Wx ₁₅ ) and the width of the image area (Wy ₁₄ ) and the width of the image area (Wy ₁₅ ) do not have to be the same, but are smaller than 50 μm in order to have a size that cannot be reproduced by a copying machine. There is a need to. Also, if the third image line (15) can be alternately arranged with respect to the first image line (13) and the second image line (14), the space between the image lines (Dy _14). ) And the line interval (Dy ₁₅ ) may have different sizes. Here, the perimeter length of the image line consisting of the first image line (13) of the background portion (8) per unit area having a side of 450 μm is 1015 μm, and the first image line (13 of the visible image portion (5) (13). ) And the third image line (15) is about 2635 μm, and the image line perimeter per unit area is larger in the visible image part (5) than in the background part (8). become. Here, the perimeter length of the image line consisting of the first image line (13) of the background portion (8) per unit area having a side of 450 μm is 1015 μm, and the second image line of the common image portion (7). The perimeter of the image line consisting of (14) and the third image line (15) is about 3240 μm, and the perimeter of the image line per unit area is greater in the common image area (7) than in the background area (8). It will be big.

  The anti-copying printed matter (1) provided with the above-described configuration and having the authenticity discrimination function of Example 3 visually recognizes the “star” symbol when observed under visible light, as in Examples 1 and 2. When copying with a copying machine, the effect of visually recognizing the “Moon” symbol was obtained. Further, when the copy-prevented printed matter (1) having a true / false discrimination function is observed by irradiating with ultraviolet rays, the visible image portion (5), the latent image portion (6) and the common image portion (7) The luminous intensity was visually recognized higher than in (8), and an effect of being able to visually recognize both the “star” symbol and the “moon” symbol was obtained.

DESCRIPTION OF SYMBOLS 1 Copy prevention printed matter provided with authenticity discrimination function 2 Base material 3 Area for authenticity discrimination 4 Print image line 5 Visible image portion 6 Latent image portion 7 Common image portion 8 Background portion 9 Visible image 10 Latent image image 11 Copy matter 12 Area for discrimination of authenticity in copied material 13 First image line 14 Second image line 15 Third image line 17 Background pattern 18 Area affected by light emission

Claims (4)

Having at least a portion for authenticity determination in which printed image lines are arranged in a line on at least a part of the substrate
The authenticity determination area includes a background portion in which a plurality of first image lines having a first size reproducible by a copying machine are arranged at a constant pitch;
A latent image portion in which a plurality of second image lines having a second size that cannot be reproduced by a copying machine are arranged at the predetermined pitch;
A third image line having a third size that cannot be reproduced by a copier that is the same as or different from the second size and a plurality of the first image lines alternately arranged at the constant pitch are visible. An image part;
The second image line and the third image line are composed of a common image portion in which a plurality of the image lines are alternately arranged at the constant pitch.
The latent image portion, the background portion, the visible image portion, and the common image portion have the same density, and the visible image portion and the common image portion have higher densities than the latent image portion and the background portion. Formed,
The latent image portion and the common image, in which a visible image is formed by the visible image portion and the common image portion having a higher density than the latent image portion and the background portion, and have an image line whose size cannot be reproduced by a copying machine. A latent image is formed by the part,
The total value of the image line perimeter of the second image line per predetermined area formed in the latent image portion is the image line perimeter of the first image line per predetermined area formed in the background portion. Greater than the total value of the first image line and the third image line perimeter of the predetermined area formed in the visible image area, and the predetermined area formed in the background area. Larger than the total value of the perimeters of the first image line per area, and the perimeters of the second image line and the third image line per predetermined area formed in the common image portion. A total value and a larger value than the total value of the perimeter of the first image line per predetermined area formed in the background portion;
The first image line, the second image line, and the third image line are printed matter made of colored ink that emits light when irradiated with ultraviolet rays,
When the printed matter is observed under visible light, the visible image is visually recognized, and when the printed matter is copied with a copying machine, the visible image disappears, the latent image becomes visible, A copy-prevented printed matter having a true / false discrimination function, wherein both the visible image and the latent image become visible when the printed matter is irradiated with ultraviolet rays.   2. The copy-proof printed matter having a true / false discrimination function according to claim 1, wherein the first image line and the second image line are arranged on the same line.   When the second image line and the third image line are formed by broken lines in which the image line part and the non-image line part are repeated at a constant cycle, the image line part constituting the second image line 3. A copy having a true / false discrimination function according to claim 1, wherein a cycle of the non-image portion is different from a cycle of the image portion and the non-image portion constituting the third image line. Prevent printed matter.   Since the area ratio of the background portion and the latent image portion is equal, the density of the latent image portion and the background portion is equal, and the area ratio of the visible image portion and the common image portion is equal, the visible image portion 4. The copy-prevented printed matter having a true / false discrimination function according to claim 1, wherein the density of the common image portion is equal to that of the common image portion.

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