JP2017013368A - Printed matter allowing authenticity determination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed matter allowing authenticity determination, which makes counterfeit difficult, while preventing reproduction of the gradation of a gradation image as it is in the gradation of a latent image.SOLUTION: The printed matter has the following characteristics: a gradation image includes a picture line unit arranged in a matrix without an interval; each picture line unit has at least a first element and a second element; the first element and the second element have areas different from each other without overlapping; a first region of the gradation image is constituted by a first picture line unit formed from an ink that has functionality in the first element and an ink that has no isochromatic functionality with the ink having the functionality under visible reflection light in the second element, and a second picture line unit formed from an ink that does not have the functionality in the first element and an ink that has the functionality in the second element; and a second region of the gradation image is constituted by a third picture line unit formed from an ink that does not have the functionality in the first element and an ink that does not have the functionality in the second element.SELECTED DRAWING: Figure 14

Description

  In the field of valuable printed matter such as banknotes, passports, securities, identification cards, cards, and passports, which are security printed matter that requires anti-counterfeiting effects, the present invention has a concentration level (level) from highlight to shadow. This is related to a printed material in which a latent image is embedded in a printed material having a tone.

  With recent developments in digital devices such as scanners, printers, and color copiers, it has become possible to easily produce elaborate copies of precious printed matter. Therefore, in order to prevent duplication and forgery as described above, various anti-counterfeit technologies that cannot be reproduced by a printer or a copier are required.

  Countermeasures against counterfeiting and alteration are important for banknotes, stock certificates, securities such as bonds, printed materials such as various certificates and important documents. Therefore, the printed surface of the printed matter is composed of extremely fine lines that have room for forgery and alteration prevention. As a technology for preventing forgery and alteration by using this fine line, a fine component such as a method using a fine line, a minute character or a halftone dot of a special shape (hereinafter referred to as a special shape halftone dot) is used. There are methods. In addition, as a technique for preventing forgery and alteration using ink having a special function, there is a printed matter of the same color or the like using a pair ink.

  Representative techniques of the method using thin lines include a background pattern, a scent pattern, a relief pattern, and the like, and a pattern is basically constituted by a set of curved lines with a fixed line width. These patterns take into account the design of printed matter, etc., and can take measures to prevent forgery and alteration, making it difficult to create the same pattern in counterfeit by making the pattern complicated. The role of anti-counterfeiting has been enhanced by using colors that are difficult to reproduce by a plate-making device or by using a color that is difficult to reproduce by a photocopier, or by generating moiré with respect to the scanning input / output of a photocopier and a scanner by creating complex curved lines. .

  In addition, patterns are widely used worldwide in the design of securities printed materials, etc., and at the same time, they have been used for a long time as patterns of printed materials having a monetary value such as banknotes, stock certificates, bonds, etc. In general, it is an important design as a design that gives an impression of luxury. Therefore, in the printed matter such as banknotes, stock certificates, securities such as bonds, various certificates and important documents, the figure composed of fine lines is indispensable for the design.

  As a representative technique of a method using a fine component, there is a method using a fine character as a fine component. Counterfeiting and alteration prevention measures for minute characters make it difficult to create the same pattern in counterfeit by making the pattern minute and complicated, and colors that are difficult to be reproduced by a photoengraving device or copying machine The role is raised as a measure to prevent counterfeiting. Furthermore, by configuring the printed surface with a large number of minute characters, a tint block pattern effective for preventing forgery and alteration can be formed, and at the same time, a large amount of text information essential for a printed product can be applied. In addition, since ordinary people can easily identify whether the wording and shape of minute characters are genuine by observing them with a magnifying glass or the like in the market distribution process, minute characters are designed for securities printed matter etc. In addition to being widely used in the world, it has long been used as a pattern for printed matter having monetary value such as banknotes, stock certificates, bonds, etc. In printed matter such as banknotes, stock certificates, securities such as bonds, various certificates and important documents, minute characters are indispensable for design.

  In addition, as a method using a micro component of a special shape halftone dot, a screen shape having design properties such as a trademark, a family crest, a symbol mark, a character, etc. can be generated by a figure obtained by a function. A shape halftone dot is disclosed (see Patent Document 1). The collection of special-shaped halftone dots can be applied to banknotes, securities, etc. as continuous tone images to prevent counterfeiting and tampering, or in the printing field where design is required, the application field can be significantly expanded. Is something that can be done. Also, the special-shaped halftone dot is an effective means for preventing forgery and alteration because it cannot be reproduced by a copying machine or the like.

  Printed materials printed on a substrate using functional ink, functional ink, and ink that does not have the same color functionality under specified conditions When the ink is observed under visible reflected light, the color of the functional ink and the non-functional ink are visually recognized as the same color, and the functional ink when observed under predetermined conditions other than under the visible reflected light. In other words, there is disclosed a technique in which the color of an ink having no functionality is different and a latent image is visually recognized (see Patent Document 2).

  In addition, a technique is disclosed in which authenticity can be determined by visually recognizing different images as latent image images between an image obtained by observing a printed material under visible reflected light and a case where the printed material is observed under visible transmitted light ( (See Patent Document 3). This printed material does not require the use of special tools such as a special light source and filter, and cannot be formed by simply printing a commercially available penetrating ink. Optical properties that can be observed with visible colors under visible reflected light, but become invisible under visible transmitted light, or change to extremely pale colors that are difficult to see It is necessary to produce a second ink having the following characteristics. For this purpose, skills and equipment for ink production are required, and a printed matter that cannot be easily counterfeited can be obtained.

  Here, let us consider a printed material that can be detected as authenticity, which is more difficult to counterfeit by combining the technology of the special shape halftone dot printed material of Patent Document 1 and the technology of the printed material using the pair inks of Patent Document 2 or Patent Document 3 or the like. . As shown in FIG. 1A, a set of special-shaped halftone dots is printed on the base material 1 ′ to form a gradation image 2 ′. As shown in FIG. 1B, the gradation image 2 ′ has a configuration having at least a first region 3 ′ and a second region 4 ′ as shown in FIG. The special shape halftone dots in the first region 3 ′ are printed with functional ink, and the special shape halftone dots in the second region 4 ′ have the same color functionality as the functional ink. Not printed with ink.

  1 is provided with a gradation image 2 ′ on a substrate 1 ′, and the gradation image 2 ′ has at least a first area 3 ′ and a second area 4 ′. Consists of composition. The gradation image 2 ′ is a “Mt. Fuji” symbol, the first region 3 ′ is a region cut out from the “Mt. Fuji” symbol in the shape of a “hawk” symbol, and the second region 4 ′ is “Mt. Fuji”. It consists of a region where the shape of the symbol “hawk” is cut out from the symbol “”. That is, the “hawk” cut out in the second area 4 ′ indicates the “hawk” cut out in the first area 3 ′, and the first area 3 ′ and the second area 4 ′ are printed together. It becomes “Mt. Fuji” in the tone image 2 ′. Therefore, when the first region 3 ′ is a latent image, the “hawk” symbol has the gradation of “Mount Fuji” as it is because the gradation image 2 ′ of “Mount Fuji” is cut out as it is. Will be.

  FIG. 2 is a diagram illustrating an example of observation conditions for the printed matter shown in FIG. FIG. 2A shows an observation state with diffused light under visible light, and the positional relationship between the light source 11 and the observer's viewpoint 12 with respect to the gradation image 2 ′ as shown in FIG. In the observation under the reflected light, the gradation image 2 ′ is visually recognized by the observer. This is because, in the observation under visible reflected light, the first region 3 ′ using the functional ink forms an image having a clearly visible color, and uses the non-functional ink. Since the second region 4 ′ forms an image having a color density that is visually recognized as the same color as the functional ink, the gradation image 2 ′ shown in FIG. 1A is visually recognized.

  Further, as shown in FIG. 2B, the viewer's viewpoint 12 that passes through the gradation image 2 ′ through a predetermined condition other than the visible reflected light 11 ′ and the viewing device 13 is shown in FIG. In the observation under the so-called visible reflected light, only the first region 3 ′ shown in FIG. 1B is visually recognized and becomes a latent image. This is because the first region 3 ′ using a functional ink in observation under visible reflected light forms an image that is clearly visible on a visual instrument or the like, and has no functionality. This is because the second region 4 ′ using is visually perceived with a viewing device or the like so that it is invisible or hardly visible.

  FIG. 3 is a conceptual diagram of the conventional printed matter shown in FIG. A gradation image 2 ′ is provided on the substrate 1 ′, and the gradation image 2 ′ has a configuration having at least a first region 3 ′ and a second region 4 ′. The authenticity of the pair ink in which the gradation image 2 'is printed on the substrate 1' using the ink having the functionality in the first region 3 'and the ink having no functionality in the second region 4'. This is a distinguishable printed material. The first region 3 ′ and the second region 4 ′ indicate a region cut out from the gradation image 2 ′ and a region cut out. The cut-out area indicates the first area 3 ′ and has a gradation of a part of the gradation image 2 ′. The cut-out area indicates the second area 4 ′, and has a partial gradation of the gradation image 2 ′. When the first area 3 ′ and the second area 4 ′ are printed together, a gradation image 2 ′ is obtained. FIG. 4 is a conceptual diagram of a special-shaped halftone dot formed in the image line unit of the conventional printed matter shown in FIG. A special shape halftone dot 6 'is formed in the image line unit 5'. The special-shaped halftone dot 6 'is formed with a different line area ratio from the shadow portion to the highlight portion according to the density of the gradation image. The shape of the special-shaped halftone dot 6 'is not particularly limited as long as it is not a general dot shape.

Japanese Patent No. 3855013 Japanese Patent Publication No. 61-37636 Japanese Patent Application Laid-Open No. 2014-30952

  As described above, since the printed matter capable of authenticating as shown in FIG. 1 has the “falcon” symbol in the first region 3 ′, it has the gradation of “Mt. Fuji” as it is. When performing authenticity determination, the gradation of “Mt. Fuji” was visually recognized in the “hawk” pattern, resulting in inferior design and difficulty in determining authenticity. In addition, if the counterfeiter grasps the components of the pair ink and attempts to counterfeit, the first area 3 'and the second area 4' can be easily divided into two from the gradation image 2 '. Therefore, there is a problem that is highly likely to be counterfeited.

  The present invention aims to solve the above-described problems, and can easily form a halftone dot with a pair of inks without reproducing the gradation of a gradation image as it is in the latent image. It is an object of the present invention to provide a printed material that can be determined whether it is authentic or not.

  The printed matter capable of authenticating authenticity in the present invention has a gradation image composed of at least a first area and a second area on a substrate, and the gradation image is arranged in a matrix without image line units. , Each drawing unit has at least a first element and a second element, the first element and the second element have different areas without overlapping, and the first region is: A first image line unit comprising ink having functionality in a first element, ink having functionality in a second element, and ink having no color matching functionality under visible reflected light; An ink having no functionality in the element and a second image line unit made of ink having a functionality in the second element, and the second region is an ink having no functionality in the first element The second element is formed by a third line unit made of ink having no functionality. The first area and the second area have gradation lines so that a gradation image is formed, and when viewed under visible reflected light, the gradation image is visually recognized and visible reflected. When observed under predetermined conditions other than under light, the latent image is visually recognized by the functional ink formed in the first image line unit and the second image line unit in the first region. It is characterized by that.

  The ink having no functionality and the ink having the functionality of the printed matter capable of authenticating authenticity in the present invention is formed by any of the following i) to iv), and i) is an ink having no functionality: Ink made of colored ink and having a functionality is composed of a colored penetrating ink that is visually different from an ink having no functionality when observed under visible transmitted light, and ii) has no functionality The ink is composed of a colored ink, the functional ink is composed of a fluorescent light-emitting ink that is visible by emitting light when irradiated with ultraviolet rays, and iii) the non-functional ink is composed of a colored ink, The functional ink is composed of a metameric ink that is visually different from the non-functional ink when viewed through a filter that cuts a predetermined wavelength under visible light. , Iv) is an ink having no functionality consists infrared transmission inks, inks having functionality is characterized by an infrared absorbing ink.

  The printed matter of the present invention capable of authenticating authenticity can provide gradation according to the design of the latent image without reproducing the gradation of the gradation image as it is in the latent image. . In addition, since the gradation image is formed with complex special-shaped halftone dots, it is difficult to reproduce, and by forming the special-shaped halftone dots with a pair of inks, the region of the pair ink is not easily specified. For this reason, if the counter-ink component is grasped by the counterfeiter, it cannot be duplicated.

  In the printed matter capable of authenticating authenticity of the present invention, an image with gradation such as a photograph is formed due to the gradation in the image line shape of the first area and the second area. High design freedom.

  In the printed matter capable of authenticating authenticity of the present invention, an image observed under visible reflected light and a predetermined condition other than under visible reflected light due to the functionality of the pair ink used in the first area and the second area. Since it is possible to make an image having no correlation at all with the latent image observed in (1), it is possible to easily determine whether the image is true or false.

  The printed material of the present invention that can authenticate authenticity can be manufactured by offset printing, which is a highly productive printing method, so it is excellent in cost performance, and even if the latest digital equipment is used, the latent image can be reproduced. Is impossible, so it has an excellent anti-counterfeit effect.

It is a figure which shows an example of the printed matter in which the conventional authenticity discrimination | determination is possible. It is a figure which shows an example of the observation conditions of the conventional printed matter in which authenticity determination is possible. FIG. 2 is a conceptual diagram of the conventional printed matter shown in FIG. FIG. 4 is a conceptual diagram of special shape halftone dots formed in an image line unit of the conventional printed matter shown in FIG. FIG. 2 is a printed material A1 and a partially enlarged view of the printed material A1 according to the present invention. FIG. 6 is a conceptual diagram of special shape halftone dots formed in an image line unit of the printed matter A1 that can be determined as authenticity shown in FIG. It is a figure which shows the 1st image line unit 5a, the 2nd image line unit 5b, and the 3rd image line unit 5c. It is a figure which shows an effect | action with the printed matter A1 which can authenticate authenticity of this invention. It is a figure which shows the difference of the area ratio of the 1st element 6a and the 2nd element 6b. It is a figure which shows the printing plate data of the printed matter A1 which can authenticate authenticity of this invention. It is a printed matter A2 and a partially enlarged view of the printed matter A2 according to the present invention. It is a conceptual diagram of the special shape halftone dot formed in the image line unit of the printed matter A2 shown in FIG. It is a figure which shows the 1st image line unit 5a, the 2nd image line unit 5b, the 3rd image line unit 5c, and the 4th image line unit 5d. It is a figure which shows an effect | action with the printed matter A2 which can authenticate authenticity of this invention. It is a figure which shows the difference of the area ratio of the 1st element 6a, the 2nd element 6b, and the 3rd element 6c. It is a figure which shows the plate surface data of the printed matter A2 which can authenticate authenticity of this invention. It is a figure which shows an example of the shape of a special shape halftone dot. It is explanatory drawing about the relationship between the dot matrix 18 in a special shape halftone dot, and a pixel.

  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.

(Embodiment 1)
FIG. 5 is a printed material A1 capable of authenticating authenticity of the present invention and a partially enlarged view thereof. As shown in FIG. 5, the printed material A <b> 1 capable of authenticating authenticity of the present invention is provided with a gradation image 2 on a substrate 1, and the gradation image 2 includes a first region 3 and a second region 4. In the following description, the two regions of the first region 3 and the second region 4 are described separately. However, the present invention is not limited to this, and it is sufficient if it has at least two regions. . The gradation image 2 is formed by a set of special shape halftone dots 6. The set of special-shaped halftone dots 6 is formed in the image line unit 5 in which the image line units 5 are arranged in a matrix without gaps. The image line unit 5 is a unit unit in which the special-shaped halftone dots 6 are formed, and is not actually printed.

  FIG. 6 is a conceptual diagram of special shape halftone dots formed in the image line unit of the printed matter A1 that can be determined as authenticity as shown in FIG. A special-shaped halftone dot 6 is formed in the image line unit 5. The special shape halftone dots 6 are formed with different line area ratios from the shadow portion to the highlight portion according to the density of the gradation image. The details of the shape of the special-shaped halftone dot 6 will be described later, but are not particularly limited as long as it is not a general dot shape. The special-shaped halftone dot 6 includes a first element 6a and a second element 6b. The first element 6a and the second element 6b have mutually different areas without overlapping.

  The first element 6a and the second element 6b forming the special-shaped halftone dot 6 are the ink having the function or the ink not having the same color function under the visible reflected light. "" By selecting the ink type of the first element 6a and the second element 6b, a latent image is formed. FIG. 7 shows the first image line unit 5a, the second image line unit 5b, and the third image line unit 5c. As shown in FIG. 7, the first region 3 of the printed matter A1 shown in FIG. 5 capable of authenticating authenticity does not have the functionality of the first element 6a1 and the second element 6b2. It is formed by a first image line unit 5a made of ink, an ink having no functionality in the first element 6a2, and a second image line unit 5b made of ink having a function in the second element 6b1. . The second region 4 is formed by a third image line unit 5c made of ink having no functionality in the first element 6a1 and ink having no functionality in the second element 6b1.

  FIG. 8 shows the operation of the printed matter A1 according to the present invention that can determine authenticity. FIG. 2 is a diagram illustrating an example of observation conditions for the printed matter A1 shown in FIG. FIG. 2A shows an observation state with diffuse light under visible light, and the positional relationship between the light source 11 and the observer's viewpoint 12 with respect to the gradation image 2 as shown in FIG. 2A, so-called visible reflection. In the observation under light, the gradation image 2 is visually recognized by the observer as shown in FIG. This is because, in observation under visible reflected light, the first region 3 is printed with functional ink and non-functional ink, and the second region 4 has no functionality. Since it is printed with ink, the first element 6a1, the second element 6b1, and the first element 6a1 and the second element in the second area 4 in the first area 3 as shown in FIG. 6b1 is visually recognized in the same color. Therefore, the first element 6a1 and the second element 6b1 in the first region 3 and the first element 6a1 and the second element 6b1 in the second region 4 cannot be separated and visually recognized.

  Further, as shown in FIG. 2B, the viewer's viewpoint 12 that passes through the gradation image 2 through a predetermined condition other than the visible reflected light 11 ′, for example, the visual recognition device 13 is shown in FIG. In the positional relationship as shown in b), that is, in the observation under the so-called visible reflected light, the latent image formed of the first region 3 is visually recognized by the observer as shown in FIG. 8B. As shown in FIG. 7, the first element 6a1 in the first image line unit 5a and the second element 6b1 in the second image line unit 5b are formed of functional ink. Therefore, only the first element 6a1 in the first image line unit 5a and the second element 6b1 in the second image line unit 5b are visually recognized. The second element 6b2 in the first image line unit 5a, the first element 6a2 in the second image line unit 5b, the first element 6a1 in the third image line unit 5c, and the second element 6b1 Is printed with ink having no functionality, so that it is not visible or hardly visible under a predetermined condition other than the visible reflected light 11 '. Therefore, it is formed in the first image line unit 5a and the second image line unit 5b in the first region 3 when observed under a predetermined condition other than under visible reflected light, for example, a visual device. The latent image is visually recognized by the ink having high functionality. The latent image is formed by the first element 6a1 in the first image line unit 5a and the second element 6b1 in the second image line unit 5b. In the first element 6a1 and the second element 6b1, Since they have different areas, different density gradations can be obtained. Therefore, a latent image having a gradation can be visually recognized without reproducing the gradation of the gradation image 2 observed with diffused light under visible light.

  FIG. 9 is a diagram showing a difference in area ratio between the first element 6a and the second element 6b. The image line unit 5 shown in FIG. 9A is arranged in a matrix with no gaps, and has a configuration of a gradation image having a first element 6a and a second element 6b. The gray scale 16 has gradation. The halftone dot shape of the special shape halftone dot is changed with the gray scale 16 gradation. As shown in FIG. 9B, the condition for forming the special-shaped halftone dot is that the elements are arranged so as not to overlap each other in the arrangement of the first element 6a and the second element 6b. . The first element 6a and the second element 6b have the same shape or different shapes. In the halftone dot area ratio of the first element 6a and the second element 6b, a network in which the total area ratio (A) of the first element 6a <the total area ratio (B) of the second element 6b is satisfied. It is an element of the point area ratio. As in FIG. 9B, in FIG. 9C and FIG. 9D, the conditions for forming the special-shaped halftone dot are indicated by the following i) to iii). i) The elements are arranged so that the elements do not overlap each other, ii) The elements have elements having the same shape or different shapes, and iii) The mesh in which the dot area ratio of the elements satisfies A <B A special-shaped halftone dot is formed under these three conditions, which are elements of the dot area ratio. FIG. 9B, FIG. 9C, and FIG. 9D show halftone dot shapes of the first element 6a and the second element 6b according to the gradation. FIG. 9B shows a halftone dot shape corresponding to a halftone dot area ratio of 90% in the gray scale 16. FIG. 9C shows a halftone dot shape corresponding to a halftone dot area ratio of 50% in the gray scale 16. FIG. 9D shows a halftone dot shape corresponding to a halftone dot area ratio of 10% in the gray scale 16.

  FIG. 10 is a diagram showing the plate data of the printed material A1 of which the authenticity can be determined according to the present invention. As shown in FIG. 10A, the first printing plate 14 is formed with a first element 6a1 in the first image line unit 5a and a second element 6b1 in the second image line unit 5b. Ink having properties is used. As shown in FIG. 10B, the second printing plate 15 includes a second element 6b2 in the first image line unit 5a, a first element 6a2 in the second image line unit 5b, and a third image. The first element 6a1 and the second element 6b1 in the line unit 5c are formed, and ink having no functionality is used. The first plate surface 14 and the second plate surface 15 are overprinted, and the printed matter A1 shown in FIG.

(Embodiment 2)
FIG. 11 is a printed matter A2 capable of authenticating authenticity and a partially enlarged view thereof. As shown in FIG. 11, the printed material A <b> 2 of the present invention capable of authenticating authenticity is provided with a gradation image 2 that is a “Mt. Fuji” pattern on the base material 1, and the gradation image 2 is the first image of the “hawk” pattern. 1 region 3 and a second region 4 around the hawk symbol. The gradation image 2 is formed by a set of special shape halftone dots 6. The set of special-shaped halftone dots 6 is formed in the image line unit 5 in which the image line units 5 are arranged in a matrix without gaps. The image line unit 5 is a unit unit in which the special-shaped halftone dots 6 are formed, and is not actually printed.

  FIG. 12 is a conceptual diagram of special shape halftone dots formed in the image line unit of the printed matter A2 shown in FIG. A special-shaped halftone dot 6 is formed in the image line unit 5. The special shape halftone dots 6 are formed with different line area ratios from the shadow portion to the highlight portion according to the density of the gradation image. The details of the shape of the special-shaped halftone dot 6 will be described later, but are not particularly limited as long as it is not a general dot shape. Next, the difference between the second embodiment and the first embodiment will be described. The special shape halftone dot 6 of the printed matter A1 of the first embodiment capable of authenticating authenticity is formed by the first element 6a and the second element 6b, but the printed matter A2 of the second embodiment capable of authenticating authenticity. The special shape halftone dot 6 is formed of a first element 6a, a second element 6b, and a third element 6c. The first element 6a, the second element 6b, and the third element 6c do not overlap and have different areas.

  The first element 6a, the second element 6b, and the third element 6c that form the special-shaped halftone dot 6 are either ink having functionality or ink having no color matching function under visible reflected light. Printed with selection. By selecting the ink type of the first element 6a, the second element 6b, and the third element 6c, a latent image is formed. FIG. 13 shows a first drawing unit 5a, a second drawing unit 5b, a third drawing unit 5c, and a fourth drawing unit 5d. As shown in FIG. 13, the first region 3 of the printed material A <b> 2 capable of authenticating authenticity shown in FIG. 11 has ink that does not have functionality in the first element 6 a 2 and functionality in the second element 6 b 1. Ink, first image line unit 5a made of ink having functionality in the third element 6c1, ink having functionality in the first element 6a1, and ink not having functionality in the second element 6b2. The second image line unit 5b made of ink having functionality in the third element 6c1, the ink not having functionality in the first element 6a2, and the ink not having functionality in the second element 6b2. The third element 6c1 is formed by the third image line unit 5c made of functional ink. The second region 4 is made up of an ink having no functionality in the first element 6a1, an ink having no functionality in the second element 6b1, and an ink having no functionality in the third element 6c1. 4 image line units 5d.

  FIG. 14 shows the operation of the printed matter A2 according to the present invention that can determine authenticity. FIG. 2 is a diagram illustrating an example of observation conditions for the printed matter A2 shown in FIG. FIG. 2A shows an observation state with diffuse light under visible light, and the positional relationship between the light source 11 and the observer's viewpoint 12 with respect to the gradation image 2 as shown in FIG. 2A, so-called visible reflection. In the observation under light, as shown in FIG. 14A, the observer can visually recognize the gradation image 2 of the symbol “Mt. Fuji”. This is because, in observation under visible reflected light, the first region 3 is printed with functional ink and non-functional ink, and the second region 4 has no functionality. Since the ink is printed, the first element 6a1, the second element 6b1, the third element 6c1 and the first element in the second area 4 in the first area 3 as shown in FIG. 6a1, the second element 6b1, and the third element 6c1 are visually recognized in the same color. Therefore, the first element 6a1, the second element 6b1, and the third element 6c1 in the first region 3 and the first element 6a1, the second element 6b1, and the third element in the second region 4 The element 6c1 cannot be divided and visually recognized.

  Further, as shown in FIG. 2B, the viewer's viewpoint 12 that passes through the gradation image 2 through a predetermined condition other than the visible reflected light 11 ′, for example, the visual recognition device 13 is shown in FIG. In the positional relationship as shown in b), so-called observation under visible reflected light, as shown in FIG. 14 (b), the observer can use the element formed with the ink having the functionality of the first region 3. The latent image is visually recognized. This is because, as shown in FIG. 13, the second element 6b1, the third element 6c1, and the first element 6a1 and the third element 6c1 in the second image line unit 5b in the first image line unit 5a. Since the third element 6c1 in the third image line unit 5c is formed of functional ink, the second element 6b1, the third element 6c1, in the first image line unit 5a, Only the first element 6a1, the third element 6c1, and the third element 6c1 in the third image line unit 5c in the second image line unit 5b are visually recognized. The first element 6a2 in the first image line unit 5a, the second element 6b2 in the second image line unit 5b, the first element 6a2 in the third image line unit 5c, and the second element 6b2 Since the first element 6a1, the second element 6b1, and the third element 6c1 in the fourth image line unit 5d are printed with ink having no functionality, a predetermined value other than the visible reflected light 11 ′ is set. Under certain conditions, the light is not visible or is hardly visible. Therefore, when observed under a predetermined condition other than under visible reflected light, for example, a visual recognition device, the first image line unit 5a, the second image line unit 5b, and the third image in the first region 3 The latent image of the symbol “鷲” is visually recognized by the functional ink formed in the image line unit 5c. The latent image of the symbol “鷲” has the second element 6b1, the third element 6c1, the first element 6a1 in the second image line unit 5b, the third element in the first image line unit 5a. The element 6c1 is formed by the third element 6c1 in the third drawing unit 5c, and the first element 6a1, the second element 6b1, and the third element 6c1 have different areas, and therefore have different densities. A gradation can be obtained. Therefore, it is possible to visually recognize the latent image of the “鷲” pattern having gradation without reproducing the gradation of the gradation image 2 observed with diffused light under visible light as it is.

  FIG. 15 is a diagram illustrating a difference in area ratio between the first element 6a, the second element 6b, and the third element 6c. The image line unit 5 shown in FIG. 15A is arranged in a matrix without a gap, and has a configuration of a gradation image having a first element 6a, a second element 6b, and a third element 6c. The gray scale 16 has gradation. The halftone dot shape of the special shape halftone dot is changed with the gray scale 16 gradation. As shown in FIG. 15 (b), the condition for forming the special-shaped halftone dot is that the first element 6a, the second element 6b, and the second element 6c do not overlap each other. The element is placed. The first element 6a, the second element 6b, and the second element 6c have the same shape or different shapes. In the halftone dot area ratio of the first element 6a, the second element 6b, and the second element 6c, the total area ratio (A) of the first element 6a <the total area ratio (B) of the second element 6b. <A halftone dot area ratio element in which the total area ratio (C) of the third element 6c is satisfied. As in FIG. 15B, in FIG. 15C and FIG. 15D, the conditions for forming the special shape halftone dots are shown by the following i) to iii). i) Elements are arranged so that the elements do not overlap each other, ii) The elements have the same shape or different shapes, iii) The dot area ratio of the elements satisfies A <B <C The special shape halftone dots are formed under these three conditions, which are elements of the halftone dot area ratio. FIG. 15B, FIG. 15C, and FIG. 15D show halftone dot shapes of the first element 6a, the second element 6b, and the second element 6c associated with gradation. FIG. 15B shows a halftone dot shape corresponding to a halftone dot area ratio of 90% in the gray scale 16. FIG. 15C shows a halftone dot shape corresponding to a halftone dot area ratio of 50% in the gray scale 16. FIG. 15D shows a halftone dot shape corresponding to a dot area ratio of 10% in the gray scale 16.

  FIG. 16 is a diagram showing plate data of the printed matter A2 of which the authenticity can be determined according to the present invention. As shown in FIG. 16 (a), the first printing plate 14 includes the second element 6b1, the third element 6c1, and the first element in the second image line unit 5b in the first image line unit 5a. 6a1, the third element 6c1, and the third element 6c1 in the third image line unit 5c are formed, and ink having functionality is used. As shown in FIG. 16B, the second printing plate 15 includes the first element 6a2 in the first image line unit 5a, the second element 6b2 in the second image line unit 5b, and the third image. The first element 6a2, the second element 6b2 in the line unit 5c, the first element 6a1, the second element 6b1, and the third element 6c1 in the fourth drawing unit 5d are formed, and the functionality is increased. The ink that does not have is used. The first printing plate 14 and the second printing plate 15 are overprinted, and the printed matter A2 shown in FIG.

  The size of the line unit is not particularly limited. However, when it is used as a copy-forgery pattern on securities such as banknotes, stock certificates and bonds, various certificates and important documents, it is one of the special shape halftone dots. One size is preferably in the range of 500 to 1000 μm, but is not limited thereto. The shape of the special shape halftone dot is not particularly limited as long as it is not a general dot shape. For example, there are shapes (a) to (f) as shown in FIG.

  The special shape halftone dots described above are created as shown in FIG. As shown in FIG. 18A, it is expressed by the presence / absence of a pixel 17 in a halftone dot matrix 18 composed of a matrix of pixels 17 of special shape halftone dots. FIG. 18A shows a halftone dot matrix 18 composed of a 16 × 16 matrix as an example. The gradation is expressed by the abundance of pixels in the halftone dot matrix 18. Note that the term “pixel” in this specification refers to an “image element” in which the minimum portion of the halftone dot matrix 18 that is finely divided is represented by binary values.

  The relationship between the halftone dot matrix 18 and the pixels in the special shape halftone dot will be described with reference to FIG. FIG. 18B is a special-shaped halftone dot used for the printed material A1 that can determine authenticity as described above. FIG. 9B shows a change in gradation from a dark color (shadow) to a light color (highlight) of the first halftone dot A in which the special shape halftone dots shown in FIGS. 9B to 9D have the first shape. . As shown in FIG. 18B, when the gradation is a dark color (shadow), the pixels 17 exist in the whole of the special shape halftone dot in the halftone dot matrix 18, and therefore A1 which is a dark color (shadow). Is expressed as When the gradation is light color (highlight), the pixel 17 exists only around the special-shaped halftone dot in the halftone dot matrix 18, and therefore, it is expressed as A1 that is light color (highlight).

  The following ink is mentioned as an ink which has the functionality used for the authenticity discrimination printed matter of this invention. Ink with functionality is the same color as normal colored ink that does not have functionality under visible reflected light, and when viewed under visible transmitted light, the color is different from that of ink that does not have functionality. Colored penetrating ink. Further, it is a fluorescent light-emitting ink that has the same color as a normal colored ink that does not have a function under visible reflected light, and that is visible by emitting light when irradiated with ultraviolet rays. In addition, it is the same color as ordinary colored inks that have no functionality under visible reflected light, and inks and colors that have no functionality when viewed through a filter that cuts a predetermined wavelength under visible light. It is a metameric ink that is visible differently. Further, it is an infrared absorbing ink that has the same color as an infrared transmitting ink that transmits in the infrared region and has no functionality under visible reflected light, and absorbs in the infrared region.

  As the base material 1 of the printed matter capable of authenticating authenticity of the present invention, paper sheets such as high-quality paper, coated paper, and art paper can be used. Moreover, a film, a plastic, and those composite materials can also be used.

  The printing method of the printed matter capable of determining authenticity of the present invention is not particularly limited, such as offset printing, gravure printing, intaglio printing, screen printing, flexographic printing, digital printing, inkjet printer, laser printer, etc. When printing such special-shaped halftone dots, offset printing, digital printing, an ink jet printer, and a laser printer are preferable.

1, 1 'base material A1, A2 Printable material 2/2' gradation image 3, 3 'first area 4, 4' second area 5, 5 'image line unit 6, 6' special Shape halftone dot 6a 1st element 6b 2nd element 6c 3rd element 6d 4th element 6a1 1st element 6b1 2nd element 6c1 3rd element 6a2 1st element 6b2 2nd element 6c2 2nd element 3 element 5a 1st image line unit 5b 2nd image line unit 5c 3rd image line unit 5d 4th image line unit 11, 11 'Visible reflected light 12 View point 13 Visual equipment etc. 14 1st printing surface 15 Second plate 16 Grayscale 17 Pixel 18 Halftone matrix

Claims (2)

Having a gradation image comprising at least a first region and a second region on a substrate;
In the gradation image, the image line units are arranged in a matrix without gaps,
Each drawing unit has at least a first element and a second element,
The first element and the second element have mutually different areas without overlapping;
The first region is composed of an ink having functionality in the first element, an ink having functionality in the second element, and an ink having no color matching function under visible reflected light. A first image line unit; an ink that does not have the functionality in the first element; and a second image line unit that includes the ink that has the functionality in the second element;
The second region is formed by a third image line unit composed of ink having no functionality in the first element and ink having no functionality in the second element,
The first area and the second area have an image line having gradation, and the gradation image is formed.
When observed under visible reflected light, the gradation image is visible,
By the ink having the functionality formed in the first image line unit and the second image line unit of the first region when observed under a predetermined condition other than under the visible reflected light. A printed matter capable of authenticating authenticity, characterized in that a latent image is visually recognized. The ink having no functionality and the ink having the functionality are formed by any of the following i) to iv):
i) The ink having no functionality is composed of a colored ink, and the ink having the functionality is visually recognized in a different color from the ink having no functionality when observed under visible light. Made of colored penetrating ink,
ii), the ink having no functionality is composed of a colored ink, and the ink having functionality is composed of a fluorescent light-emitting ink that is emitted and visually recognized when irradiated with ultraviolet rays,
In iii), the non-functional ink is a colored ink, and the functional ink has the functionality when observed through a filter that cuts a predetermined wavelength under visible light. It consists of metameric ink that is visually recognized in different colors from the ink that does not
The printed matter capable of authenticating authenticity according to claim 1, wherein the ink having no functionality is an infrared transmitting ink, and the ink having the functionality is an infrared absorbing ink.

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