JP2009285843A - Forgery-proof printed matter with confidential information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide printed matter embedding confidential information which can hardly be confirmed with the naked eye, in order to enhance a forgery-proof effect on a precious article. <P>SOLUTION: The printed matter has confidential information comprising a plurality of regularly arranged image defining lines in at least, a part of the surface of a base material. The image defining lines are constituted of a basic image defining line formed on the basis of confidential information, not less than one dilated image defining line arranged at a specified interval, in positions outside of the basic image defining line, and/or not less than one shrinking image defining line arranged at a specified interval, arranged inside of the basic image defining line. The longitudinal image defining line and the crosswise image defining line which constitute each image defining line, are almost at right angles to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printed matter having a line drawing pattern that can enhance the effect of preventing counterfeiting of valuables such as banknotes, passports, securities, cards, stamps, product tags, toll roads, and various valuable tickets. It is.

  Anti-counterfeiting technology is applied to valuable items such as banknotes, passports, securities, cards, stamps, product tags, toll road tickets, and various tickets. Therefore, for such a valuable item, for example, a printed pattern is formed with a chromatic pattern or a copy-preventing image line by a line image in order to obtain an effect of preventing duplication or copying in a copying machine.

  In addition, a technique for embedding minute characters in a chromatic pattern is disclosed in order to enhance the anti-counterfeit effect of the chromatic pattern. For example, in a printed material on which at least a part of the striated pattern is applied on the base material, at least a part of the scented pattern is composed of characters, and the scented pattern is simply composed with the naked eye. However, only a person who knows the information has disclosed a printed matter having characters in a part of a colored pattern that can recognize the presence of the minute character as an authentic product (for example, patent document) 1).

  Also, a technique for forming a copy prevention image line by a line image in order to obtain a copy prevention effect in a copying machine is disclosed. For example, the outlines of characters and symbol marks of a plurality of logotypes and the like having an image line of a constant image line width, and the outward line segment forming the outline line, than the line width of the line segment of the outline line Applying a line that is continuously extended by a narrow line width, and inwardly extending the line segment forming the outline line, applying a contracted array line with a line width narrower than the line width of the outline line segment, A method and a printed matter for creating a copy-preventing pattern composed of an assembly of lines in which the line segment forming the contour line, the line continuously expanded continuously, and the image line contracted and arranged form an arithmetic sequence. This is a technique for obtaining an effect of preventing copying by generating a moire pattern when copying with a machine or the like (see, for example, Patent Document 2).

  Furthermore, the outlines of characters and symbol marks of a plurality of logotypes and the like having an image line of a certain image line width, and the line segments forming the outlines are more outward than the image line widths of the outline lines. Applying a line that has been continuously expanded in a constant amount with a thick line width, and inwardly extending the line segment forming the outline line, applying a contracted array line with a line width larger than the line width of the outline line segment, A method and a printed matter for creating a copy-preventing pattern composed of an assembly of lines in which the line segment forming the contour line, the line continuously expanded continuously, and the image line contracted and arranged form an arithmetic sequence. This is a technique for obtaining a copy prevention effect by the generation of a moire pattern when copying with a machine or the like (see, for example, Patent Document 3).

JP 2007-15320 A (page 1-4, FIG. 1-7) Japanese Patent No. 3368329 (page 1-9, FIG. 1-11) Japanese Patent No. 3368330 (1-5 pages, 1-7)

  The printed matter of Patent Document 1 can confirm minute characters when observed with a magnifier such as a magnifying glass. In addition, the printed matter of Patent Document 2 and Patent Document 3 has characters, logo marks, etc. formed by spread lines, and is intended to generate moire when copied by a copying machine. The logo mark can be confirmed with the naked eye, and the outer image line becomes a curve as shown in FIG. 27 as it goes outward with respect to the outline of the character and the logo mark. In addition, when information such as characters is used as confidential information in the spread line, there is a problem that the confidential information in the spread line is confirmed in advance with the naked eye.

Furthermore, due to the recent popularization of computer equipment, counterfeiting of valuables has become more common than before, and it is possible to determine whether it is genuine or not with a more complicated line drawing shape that is difficult to duplicate. There is a need for printed materials having various embedded information.

  Here, it is also described in Patent Document 2 and Patent Document 3, and the spread image line 4 in the present invention refers to a predetermined line image 4a (binary image data) as shown in FIG. This is a pattern in which extended image lines 4a + 1, 4a + 2... And / or contracted image lines 4a-1, 4a-2... Continuously expanded at predetermined intervals so as to be inward are formed.

  The present invention aims to solve such a conventional problem, and proposes a printed matter having confidential information characterized by embedding confidential information that is difficult to be confirmed with the naked eye in a spread line. For the purpose.

  The present invention provides a printed matter having confidential information composed of a plurality of regularly arranged image lines on at least a part of a base material, wherein the plurality of image lines are formed based on the confidential information. And one or more expansion lines arranged at predetermined intervals on the outer side with respect to the basic image line and / or shrinkage arranged at one or more predetermined positions on the inner side with respect to the basic image line. It has secret information characterized in that it is composed of at least an image line, and a vertical image line and a horizontal image line constituting the basic image line, the extended image line, and the contracted image line are substantially perpendicular to each other. It is printed matter.

  In the plurality of image lines of the present invention, a supplementary image line is further arranged in a blank area generated when the expanded image line and the contracted image line are arranged with respect to the basic image line. Is a printed matter having confidential information characterized in that the vertical and horizontal image lines are substantially perpendicular.

  The plurality of image lines of the present invention are printed matter having confidential information characterized in that the image line width and the non-image line width are equal.

  In the plurality of image lines, the non-image line width between the basic image line and the extended image line or the contracted image line arranged next to the basic image line is other non-image line width. Unlike the above, the other non-image line widths are equal to each other, and the printed matter has confidential information.

  The basic image line of the present invention is a printed matter having confidential information, which is formed based on an outline of the confidential information.

  In the present invention, the basic image line is printed with functional ink, and the plurality of image lines other than the basic image line are printed with ink having no functionality, or other than the basic image line. The plurality of image lines are printed with a functional ink, the basic image lines are printed with an ink having no functionality, and the ink having the functionality and the ink having no functionality are the same color. It is a printed matter having confidential information characterized by being.

  The printed matter having the confidential information of the present invention is arranged in a fine image line in which the desired confidential information is regularly arranged, so that the confidential information is applied even if the printed pattern is visually confirmed. It cannot be confirmed, and even if an attempt is made to imitate the printed matter, it is very difficult to create a printed matter that reproduces the confidential information.

  Further, as described above, since it is very difficult to create a counterfeit printed material that reproduces even confidential information, it is possible to easily determine whether it is a counterfeit product or an authentic product based on the presence of confidential information.

  In addition, the printed matter having the confidential information of the present invention is composed of spread lines having numbers, characters, symbols, or logo marks, so the spread line itself is complicated and difficult to forge. .

  Moreover, since the spread image line | wire which has confidential information is comprised by the line drawing, the printed matter which has confidential information of this invention is applicable also as background patterns, such as printed matter, and can be used in various printed matter.

  The best mode for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the best mode for carrying out the invention described below, and various other embodiments are included within the scope of the technology described in the claims.

  In addition, each image line constituting the printed matter having the confidential information in the present invention is arranged at a position outside the basic image line, which is an image line (hereinafter referred to as “basic image line”) composed of contour lines forming the confidential information. Stretched image (hereinafter referred to as “expanded image line”), an image line arranged at a position inside the basic image line (hereinafter referred to as “shrinkable image line”), and the basic image line are not directly related to the expanded image. This is an image line (hereinafter referred to as “supplementary image line”) arranged in a blank area generated when a plurality of lines and / or contracted image lines are arranged. In addition, an image line group consisting of at least one of the extended image, the contracted image, and the supplementary image and the basic image is defined as a spread image, and a pattern composed of the spread image on the printed matter is defined as a background pattern. To do.

  As shown in FIG. 2A, the basic image line in the present invention forms secret information (hereinafter referred to as “closed figure”) by surrounding image lines, and FIG. It may be a dotted line as shown in (c) or an alternate long and short dash line. Furthermore, although it is basically a closed figure as shown in FIG. 2 (d), it may have a shape in which some of the lines are interrupted. Any secret information such as a wavy line, a broken line, and a dotted line may be formed as a closed figure. Moreover, you may form the edge part (corner) which secret information forms with a curve. In this case, the edge portions of the extended image line, the contracted image line, and the supplementary image line are the same curve as the curve of the edge part formed by the confidential information without increasing the curve width.

  Accordingly, it means that at least one extended drawing line is arranged at an outer position and at least one contraction drawing line is arranged at an inner position with respect to this closed figure.

(Printed matter with confidential information)
FIG. 3 is a diagram showing a printed matter 1 having confidential information according to the present invention. The printed material 1 has a ground pattern 3 formed by a plurality of regularly arranged lines on a base material 2. The spread pattern 4 of the present invention is applied to the tint block pattern. Note that the tint block pattern including the spread image line 4 is printed on the entire surface of the base material in the present embodiment, but is not limited thereto, and may be printed on a part of the base material. FIG. 4 is an enlarged view of FIG. 4A in which the portion 5 surrounded by the dotted line is enlarged in FIG. 3A, and FIG. 4B in which a part of the spread image line 4 at that position is enlarged. FIG. 4C shows the arrangement of the vertical and horizontal image lines. Hereinafter, the tint block pattern 3 having the spread image line will be described in detail.

  As shown in FIG. 4, a basic image line 4a serving as confidential information is formed on the base material 2, and at least one or more extended image lines 4a + 1 at a predetermined interval outside the basic image line 4a. 4a + 2,... 4a + n (n is an integer greater than or equal to 3) is formed, and a supplementary image line 4b for filling a blank area is arranged in a place that is neither a basic image line nor an extended image line, so-called A tint block pattern is formed by the spread stroke. In FIG. 4, the spread image line is configured with the extended image line outside the basic image line 4 a, but the contracted image line may be formed inside the basic image line 4 a.

  At this time, the stroke width of the basic stroke, the stroke width of the extended stroke, and the stroke width of the contracted stroke are the same, and the non-drawing width of the expanded stroke and the non-drawing width of the contracted stroke are It is preferable that they are the same. This is because confidential information is difficult to confirm with the naked eye because the image area ratio per predetermined area is the same. When confirming confidential information using a filter, which will be described later, it is possible to confirm confidential information more easily by making the non-image widths of the basic image line, the extended image line, and the contracted image line slightly different. Therefore, it is only necessary to determine the interval of the non-image line width by a true / false discrimination method. In the present invention, the image line width means the thickness (a) of each image line constituting the spread image line as shown in FIG. Is the interval (b) between adjacent image lines.

  The spread image line 4 is a basic image line 4a of confidential information, an extended image line 4a + 1, 4a + 2,..., 4a + n (n is an integer of 3 or more) and a supplementary image line 4b with respect to the basic image line 4a. As shown in c), the vertical image line (c) and the horizontal image line (d) are arranged so as to be substantially perpendicular (90 degrees ± 5 degrees). This is to make the printed information having confidential information of the present invention, which will be described later, in order to make the image line arrangement without any sense of incongruity and to make the confidential information more difficult to visually recognize.

  In addition, in order to make it difficult to view confidential information when giving to small valuables such as banknotes, passports, securities, cards, stamps, product tags, toll road tickets, various tickets, etc. In addition, the stroke width of the basic stroke, the stroke width of the extended stroke, the stroke width of the contraction stroke, and the stroke width of the supplementary stroke are in the range of 25 to 500 μm, and the non-drawing stroke of the extended stroke The width, the non-image width of the contracted image line, and the non-image line width of the supplementary image line are preferably in the range of 100 to 1000 μm.

  The secret information given to the printed material 1 of the present invention can be given a logo mark such as a number, a character, a symbol, a picture, or a design.

  The printing method used in the present invention is not particularly limited. For example, printing can be performed by intaglio printing, gravure printing, screen printing, offset printing, laser printer, inkjet printer, or the like.

  In addition, the number of expansion lines arranged outside the basic line of the spread line, contraction lines and supplemental lines arranged inside, the area forming the spread line, the shape of the confidential information to be given, Varies depending on the line width and non-line width. Therefore, depending on the area for forming the spread image line, the shape of the confidential information to be added, the image line width, and the non-image line width setting value, either the expanded image line, the contracted image line, or the supplementary image line may not be formed. is there.

(How to create printed matter)
For the printed matter having confidential information of the present invention, it is preferable to use the line drawing data creation method described in Japanese Patent Application No. 2008-120833 filed earlier by the present applicant.
Below, based on Japanese Patent Application No. 2008-120833 for which it applied previously, the preparation method of the printed matter of this invention is demonstrated.

  FIG. 5 is a flowchart showing a method of creating spread line drawing data. As shown in FIG. 5, in the first step, binary image data 6 including a pixel value {0} and a pixel value {1} serving as confidential information to be applied to the printed matter of the present invention is acquired from a predetermined original image. The above-mentioned predetermined original image may be automatically generated as a binary image including character information by software, or binarized into a multi-gradation image such as a photograph using image processing software or the like. A predetermined binary image may be created by applying. The binary image data 6 including the pixel value {0} and the pixel value {1} includes the pixel value {0}, the pixel value {1}, and the pixel value {α} (α is an integer other than 0 and 1). It may be image data. The pixel value {0} is a black pixel, the pixel value {1} is a white pixel, and the pixel value {α} is a pixel defined in advance other than the black pixel and the white pixel. Therefore, the pixel value {α} is represented by an arbitrary integer other than 0 and 1. The storage format of the binary image data 6 is not particularly limited, and BMP, TIFF, JPEG, GIF and the like are possible.

  An example of the binary image data 6 is shown in FIG. The binary image data 6 in FIG. 6 is composed of numbers and alphabetic characters. The numbers and alphabetic characters are represented by black pixels with pixel values {0}, and the peripheral areas of the numbers and alphabetic characters are pixel values {1}. It is expressed with. The binary image data is not limited to that shown in FIG. 6, and the binary image data is composed of numerals and alphabetic characters. The numerals and alphabetic characters are represented by pixel values {0} as black pixels. The pixel value {α} other than the pixel value 0 and the pixel value 1 may be used.

  Next, enlarged image data 7 is created by enlarging each pixel of the binary image data 6 to n × n pixels in the second step with respect to the binary image data 6 acquired in the first step. In this n × n pixel, n needs to be a positive even number, and in particular, n is preferably 2. An example of conversion from the binary image data 6 to the enlarged image data 7 is shown in FIG. FIG. 7 is a diagram showing enlarged image data 7 obtained by enlarging each pixel P of the binary image data 6 to 2 × 2 pixels, and 4 × 3 pixels which are partial enlarged views of the binary image data 6 are enlarged images. The data 7 is converted into 8 × 6 pixels which is a partially enlarged view. At this time, the black pixel having the pixel value {0} is enlarged to 2 × 2 pixels, but once the pixel values of all the 2 × 2 pixels are set to {0}, an array replacement unit described later is used. Convert.

  Next, with respect to the enlarged image data 7 acquired in the second step, the enlarged image data 7 is divided into n × n pixels (n is a positive even number) in the third step, and the pixel values of all the arrays are predetermined. The sequence replacement image data 8 is created by the replacement according to the sequence replacement rule. An example of conversion from the enlarged image data 7 to the array replacement image data 8 is shown in FIG. FIG. 8 illustrates that {0, 0, 0, 0} pixels of the enlarged image data 7 enlarged to 2 × 2 pixels are {α, α, 0, The array replacement image data 8 is shown in which the pixels {1, 1, 1, 1} are replaced with {α, α, α, α} by replacing with α}. The predetermined sequence replacement rule is not limited to the replacement rule described above. Therefore, an example of a 2 × 2 pixel array replacement rule will be described.

  As shown in FIG. 9, an array Ci (i = 1, 2,..., 7) of 2 × 2 pixels is converted into Ci = {using pixel values Pxy (x = 1 or 2; y = 1 or 2). P11, P21, P12, P22}, C1 = {0, 0, 0, 0}, C2 = {1, 1, 1, 1}, C3 = {0, α, α, α} (α is C4 = {α, 0, α, α}, C5 = {α, α, 0, α}, C6 = {α, α, α, 0} and C7 = {α, α , Α, α} and when the 2 × 2 pixel array is C1, select and replace any one of C3, C4, C5, and C6, and the 2 × 2 pixel array is C2 Substitutes C7. By this processing, as shown in FIG. 10B, it is possible to prevent the occurrence of a blank area S generated between the image lines. In the blank area S, if the extended image line and the contracted image line are arranged without performing any processing on the basic image line indicating the confidential information, the image line interval between the basic image lines is not necessarily constant. Therefore, as shown in FIG. 10A, the line interval between the extended image lines adjacent to each other finally becomes non-uniform.

  Next, as shown in FIG. 11, the array replacement image data 8 created in the third step is moved vertically or horizontally with respect to a predetermined pixel value {α} of the array replacement image data 8 by the fourth step. Are both converted to the pixel value {0}, and the pixel linked image data 9 is created. However, before actually converting the pixel value {α} to the pixel value {0}, it is assumed that all the necessity for conversion to the pixel value {0} is determined. If the conversion to the pixel value {0} is performed before the determination is completed, an unintended conversion result as shown in FIG. 12 is obtained.

  Note that the fourth step of creating the pixel concatenated image data 9 is not necessarily performed as enclosed by the dotted line in the flowchart of FIG. When the fourth step is omitted, for example, as shown in FIG. 16, the basic image line forming the confidential information is a set of small squares. When the fourth step is performed, for example, as shown in FIG. In this way, the basic image line forming the secret information has the contour shape of the secret information. However, the image area ratio per predetermined region is the same whether the fourth step is performed or omitted.

  The pixel value {α} of the array replacement image data 8 created in the third step or the pixel concatenated image data 9 created in the fourth step is converted into {0} or {1} by the fifth step. Then, extended conversion image data is created. As shown in the flowchart of FIG. 13, in order to create the extended conversion image data 10, the pixel value of an adjacent pixel is {α} with respect to the pixel value {0} of the array replacement image data 8 shown in FIG. In the case where the pixel value of the adjacent pixel is {α} with respect to the first extended conversion for converting the pixel value of the adjacent pixel to {1} and the converted pixel value {1}, The extended converted image data 10 is generated by repeating the second extended conversion for converting the pixel value of the adjacent pixel into {0} and the first extended conversion and the second extended conversion until the pixel value {α} disappears. To do. The adjacent pixels referred to here are eight pixels indicated by oblique lines around the reference pixel value as shown in FIG.

  Next, with respect to the extended converted image data 10 created in the fifth step, the outline of the extended converted image data 10 is extracted in the sixth step to create line drawing data, and the spread drawing line data 11 is obtained. FIG. 16 shows spread line drawing data 11 obtained by extracting the contour of the extended conversion image data 10. By printing on the base material using the created spread image data 11, a printed matter having confidential information can be created.

(Authentication method for printed matter)
Whether or not confidential information is included in the printed matter 1 of the present invention is that only the creator recognizes it, and it is difficult for the third party other than the creator to confirm the confidential information with the naked eye. Therefore, it is difficult to confirm whether confidential information is included. Therefore, when it becomes necessary to determine authenticity, it is necessary to confirm confidential information by a predetermined confirmation method. Therefore, the authenticity determination method for the printed matter 1 having confidential information according to the present invention will be described below.

(Authenticity discrimination method 1)
FIG. 17 shows a first embodiment of a method for determining authenticity of a printed material 1 having confidential information according to the present invention. FIG. 17A is an enlarged view of a part of the printed matter 1 having the confidential information of the present invention. FIG. 17B is a diagram for confirming the confidential information of the printed matter 1 having the confidential information of the present invention. FIG. 17C is a diagram showing confidential information that can be confirmed when the discriminating tool 12 of FIG. 17B is superimposed on the printed matter of FIG. 17A. . In FIG. 17A, the basic image line 4a forming confidential information is represented by a double line in the drawing, but it is easy to understand in order to explain the arrangement in relation to the discriminator 12 described later. In the actual printed matter, it is the same line as the extended line in the peripheral area.

  Further, FIG. 17D is a further enlarged view of the portion surrounded by the dotted line in FIG. As shown in an enlarged view in FIG. 17D, when the lattice pattern discriminator 12 as shown in FIG. 17B is used, the basic image line 4a forming the secret information and the basic image line 4a The secret information as shown in FIG. 17 (c) is confirmed by making the non-image width of the extended image line 4a + 1 placed next to the non-image width slightly different from other non-image widths. Can do. Note that the image line width of the basic image line 4a is set to the extended image lines 4a + 1, 4a + 2,..., 4a + n (n is an integer of 3 or more) arranged on the peripheral area of the basic image line 4a and the discriminator 12. Even if the line width is slightly larger than the image line width, the secret information 4 can be confirmed by superimposing the checker 12 having a lattice pattern on the printed matter 1. Therefore, the line width of the lattice pattern 13 of the discriminator 12 and the line width of the spread line on the printed material 1 may be different, and what is important is to make the non-line widths the same.

  The discriminator 12 shown in FIG. 17B has the same line width and non-line width as the spread line and the non-line width of the spread line constituting the printed matter 1 having the confidential information of the present invention on the transparent film. It is a lattice pattern 13 composed of a group of image lines formed by a plurality of image lines having an image line width. The discriminating tool 12 does not have to be a transparent film, and a translucent film or highly light-transmitting paper can also be used.

  As described above, the image line group formed on the transparent film has an orthogonal lattice pattern 13 with the same image line width and non-image line width as the spread image line width and non-image line width. However, apart from this aspect, as shown in FIG. 18B, a region 15 in which the basic image line 4a forming the confidential information printed on the printed matter 1 is outlined is provided, and the other region 16 is set as the printed matter 1. The discriminating tool 12 printed with a solid color different from the spread image printed on is prepared. The discriminating tool 12 is placed at a predetermined position 14a of the printed material shown in FIG. 18A so that the basic image line 4a on which the confidential information on the printed material 1 is formed and the white area 16 are in the same position. In addition, a reference position 14b is provided in the discriminator 12 in FIG. When the discriminating tool is stacked on the printed matter 1 so that the predetermined position 14a of the printed matter and the reference position 14b of the discriminating tool 12 are the same position, the white portion of the transparent film that is solidly printed as shown in FIG. Confidential information can be confirmed.

(Authenticity discrimination method 2)
FIG. 19 shows authenticity determination method 2 different from authenticity determination method 1 described above.
In the authenticity determination method 2 shown in FIG. 19, a basic image line 4 a forming confidential information is printed with a functional ink in a background pattern 3 to be printed on the printed matter 1. For example, the basic image line 4a forming the confidential information and the ink color for printing the other spread image lines are the same color, and the ink for printing the basic image line 4a has a pigment that emits light when irradiated with ultraviolet rays. Contain. Even if the printed material 1 is viewed under visible light, the confidential information cannot be confirmed. However, when the printed material 1 is irradiated with ultraviolet rays using the ultraviolet lamp 17 or the like, only the basic image line 4a emits light and the confidential information is displayed. Can be confirmed.

  In addition, the image line printed with the functional ink may not be the basic image line 4a as described above, but may be a spread image line excluding the basic image line 4a. In that case, only the basic image line 4a is reversed. Is printed with ink having no functionality.

  In addition, the ink containing the functionality for printing the basic image line 4a for forming the confidential information is applied to the spread image line for forming the tint block pattern such as infrared rays, magnetic characteristics, metameric characteristics, etc. in addition to the above-described ultraviolet light emission characteristics. As long as it is the same color as the ink to be printed, it is sufficient that the confidential information can be confirmed by a confirmation method suitable for the characteristics of the functional pigment contained therein, and the type of functionality is not particularly limited.

  Since it is possible to determine authenticity using the ink containing the above-described functionality for the spread image line in the present invention, even in any conventional spread image line, as in the present invention, It goes without saying that the authenticity determination method described in this specification is performed by using an ink containing functionality.

(Authentication method 3)
FIG. 20 shows authenticity determination method 3 different from authenticity determination method 2 or 3 described above.
FIG. 20 shows a method of pattern matching the confidential information printed on the printed material 1 with the regular confidential information stored in advance by computer image processing. Specifically, an image of the printed material 1 is acquired by a scanner or a CCD camera, and the acquired image is searched by pattern matching to determine whether the stored confidential information is included in advance. If it does not fit, it will be judged as no. As another authenticity determination method by this computer image processing, a known image processing method called template matching may be applied, and any other method that can be compared and determined by regular confidential information and image processing, in particular. It is not limited.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, the content of this invention is not limited to the range of these Examples.

(Example 1)
In FIG. 3, a background pattern 2 is printed on the entire surface of the gift certificate 1, and this background pattern 2 is composed of spread lines with the pattern shown in FIG. 21 as confidential information. The width of each drawing line constituting the spread drawing line is 150 μm, and the non-drawing line width of the extended drawing line, the contraction drawing line, and the supplementary drawing line is 300 μm. As a method for authenticating the gift certificate 1 in the first embodiment, since the discriminator uses a lattice pattern to be described later, the arrangement of the basic image lines 4a constituting the confidential information is as shown in FIG. The basic image line 4a is shifted from the base material 1 by 50 μm on the left side in the horizontal direction and on the upper side in the vertical direction. Therefore, the non-image line width y on the left and upper sides of the basic image line 4a is 250 μm, and the non-image line width z on the right and lower sides of the basic image line 4a is 350 μm. All other non-image widths x are the same at 300 μm. The tint block pattern 2 having this configuration is printed on a paper base by a laser printer.

  In the present embodiment, as described above, the basic image line 4a is shifted to the left in the horizontal direction and the upper side in the vertical direction. However, the shifting direction is not particularly limited, and the basic image line and the basic image line are not limited. The non-drawing width of the extended drawing line or contraction drawing line placed next to the non-drawing line width of other shrinking lines, the non-drawing line width of extended drawing lines, or the non-drawing line of supplementary drawing lines. If the arrangement is such that the line width, the non-image line width of the extended image line and the supplementary image line, and the non-image line width of the contracted image line and the supplementary image line are different, the direction is not limited.

  A method for creating the tint block pattern 2 having confidential information in the gift certificate 1 will be described. First, the pattern A shown in FIG. 21 was created as binary image data having a pixel value {0} and a pixel value {1}. Of the binary image data, the pixel value {0} represents the pattern A, and the pixel value {1} represents the peripheral area of the pattern A. Next, enlarged image data was created by enlarging each pixel of the binary image data to 2 × 2 pixels. Next, the pixel of C1 = {0, 0, 0, 0} in the enlarged image data is replaced with C5 = {2, 2, 0, 2}, and the pixel of C2 = {1, 1, 1, 1} is , C7 = {2, 2, 2, 2} to create sequence replacement image data. Next, when both the upper and lower or left and right pixel values are {0} with respect to the pixel value {2} of the array replacement image data, it is converted into the pixel value {0} to create pixel concatenated image data. Next, when the pixel value of the adjacent pixel is {2} with respect to the pixel value {0} of the pixel linked image data, the pixel value of the adjacent pixel is converted to {1}, and the pixel value {1} On the other hand, when the pixel value of the adjacent pixel is {2}, the pixel value of the adjacent pixel is converted to {0}, and the conversion process is continuously repeated until the pixel value {2} is eliminated, and extended conversion is performed. Image data was created. Finally, the outline of the extended conversion image data is extracted to create line drawing data having a line width of 150 μm and a non-drawing line width of 300 μm, and then only the basic drawing line 4a is obtained using commercially available line drawing editing software. Were placed 50 μm apart on the upper left side.

  When the gift certificate 1 of Example 1 is observed with the naked eye under visible light, the line width of the basic line 4a constituting the spread line, the extended lines 4a + 1, 4a + 2,..., 4a + n (n is 3), the contracted image lines 4a-1, 4a-2,..., 4a-n (n is an integer of 3 or more) and the supplementary image line width. Because the non-image width of the extended image, the non-image width of the contracted image, and the non-image width of the supplementary image are the same, that is, the image area ratio per predetermined area is the same. It was difficult to confirm the confidential information (symbol A) with the naked eye. Note that, as described above, since the discriminating tool based on the lattice pattern is used, the basic image line 4a is shifted to the upper left by 50 μm, so that the basic image line 4a and the extended image line 4a + 1 adjacent to the basic image line 4a are arranged. Only the non-image width is different from other non-image widths.

  A discriminator 12 for confirming the confidential information 4 was prepared for the gift certificate 1. The discriminating tool 12 has a lattice pattern 13 shown in FIG. 17B formed on a transparent film. The grid pattern 13 has an image line width of 150 μm, which is the same as the image line width of the spread image line, and a non-image line width of 300 μm. When this discriminating tool 12 was superimposed on the gift certificate 1 and observed, the secret information 4 could be confirmed in the lattice pattern.

(Example 2)
In FIG. 22, a pattern is printed on a part of the certificate 18, and this pattern is composed of spread image lines as shown in FIG. 24 with the design B shown in FIG. 23 as confidential information. The width of each image line constituting the spread image line is 120 μm, and the non-image line width is 250 μm. 4a + 1, 4a + 2,..., 4a + n (n is an integer of 3 or more), contracted image line 4a-1, 4a-2,..., 4a-n (n is an integer greater than or equal to 3) and the line widths and non-line widths of the supplementary lines are the same.

  In the second embodiment, the ink for applying a pattern to the paper substrate is different from that in the first embodiment. Specifically, the basic image line 4a constituting the confidential information shown in FIG. 25 (a) is printed with ink blended with a pigment having ultraviolet light emission characteristics, and other extended image lines shown in FIG. 25 (b). The shrinkage image line and the supplemental image line are not blended with a pigment having an ultraviolet light emission characteristic, and the two kinds of inks have the same light purple color. With this configuration, the entire pattern appears to be composed of one color under visible light, but the basic image line 4a emits light when irradiated with ultraviolet rays, and the symbol B of the confidential information can be confirmed. Two plates, a plate for secret information pattern B shown in FIG. 25A and a plate for spread image line from which the symbol B of secret information shown in FIG. 25B is deleted, are produced by an offset printing machine. These two plate patterns are printed on a paper base material.

  A method of creating a pattern having confidential information in this certificate will be described. First, as in Example 1, the pattern B shown in FIG. 23 was created as binary image data of the pixel value {0} and the pixel value {1}. Of the binary image data, the pixel value {0} represents the design B, and the pixel value {1} represents the peripheral region of the design B. Next, as shown in FIG. 7, enlarged image data in which each pixel of the binary image data is enlarged to 2 × 2 pixels was created. Next, in the procedure as shown in FIG. 9, the pixel of C1 = {0, 0, 0, 0} in the enlarged image data is replaced with C5 = {2, 2, 0, 2}, and C2 = {1, 1, 1, 1} pixels were replaced with C7 = {2, 2, 2, 2} to create array replacement image data. Next, as shown in FIG. 11, with respect to the predetermined pixel value {2} of the array replacement image data 6, the upper and lower or left and right pixel values are both converted to the pixel value {0} where {0}. Pixel-linked image data was created. Next, the pixel value {0} of the pixel linked image data is converted into the pixel value {1} where the pixel value of the adjacent pixel is {2}, and is adjacent to the pixel value {1}. The pixel value {2} of the pixel was converted to the pixel value {0}, and the conversion process was continuously repeated until the pixel value {2} disappeared to create extended converted image data. Finally, the outline of the extended converted image data was extracted to create line drawing data having a line width of 120 μm and a non-line width of 250 μm.

  When the printed matter having the confidential information in the spread line of Example 2 is observed with the naked eye under visible light as shown in FIG. 26A, the basic line, the extended line, the contracted line, and the supplementary line are displayed. The image line width is the same, and the non-image line widths of the image lines in the extended image line, the contracted image line, and the supplementary image line are the same. That is, since the image area ratio per predetermined area is the same, it is difficult to confirm the confidential information (symbol B) with the naked eye. In FIG. 26A, for convenience of explanation, since the image line width and the non-image line width are wide, the confidential information can be recognized. However, in the actual printed matter, the confidential information is confirmed as described above. It is difficult to do.

  When this printed matter is irradiated with ultraviolet rays by an ultraviolet lamp as shown in FIG. 26 (b), only the basic image line 4a printed with ink having ultraviolet emission characteristics emits light, and the confidential information is confirmed. I was able to.

  Further, it is possible to combine a copy-preventing image line with the printed matter of the present invention, and to obtain an anti-copying effect. For example, copy prevention techniques such as JP-A-8-197828, JP-A-8-300800, JP-A-57-20397, JP-A-2000-185457 can be employed, and JP-A-2000-263911. Forms as described can be formed. However, the concealment information in the spread line is not a triangle but a complicated form such as a number, a character, a symbol, or a logo mark character such as a picture or a design.

It is a figure which shows a spread drawing line. It is a figure explaining the basic image line in this invention. It is a figure which shows embodiment of this invention. It is the figure which expanded a part of embodiment shown in FIG. It is a flowchart which shows the creation method of the spread image line of this invention. It is a figure which shows an example of the binary image data of this invention. It is a figure which shows an example converted into binary image data from expansion image data. It is a figure which shows an example converted from expansion image data to arrangement | sequence replacement data. It is a figure which shows the example of the arrangement | sequence replacement rule of 2x2 pixels. It is a figure which shows the problem of the line drawing data preparation of the conventional spread drawing line. It is a figure which shows an example converted into arrangement | sequence replacement image data from pixel connection image data. It is a figure which shows an example converted into the pixel connection image data which are not intended from arrangement | sequence replacement image data. It is a flowchart which shows an expansion conversion means. It is a figure which shows an example converted into sequence conversion image data from expansion conversion image data. It is explanatory drawing of the adjacent pixel in expansion conversion image data. It is a figure which shows an example converted into extended stroke image data from expansion conversion image data. It is a figure explaining the authenticity determination method 1 with respect to the printed matter of this invention. It is a figure explaining the authenticity determination method 2 with respect to the printed matter of this invention. It is a figure explaining the authenticity determination method 3 with respect to the printed matter of this invention. It is a figure explaining the authenticity determination method 4 with respect to the printed matter of this invention. It is a figure which shows the confidential information in Example 1. FIG. FIG. 6 is a diagram illustrating a printed matter having confidential information according to a second embodiment. It is a figure which shows the confidential information in Example 2. FIG. It is a figure which shows the spread image line with respect to the confidential information in Example 2. FIG. It is the figure which decomposed | disassembled the spread drawing line of Example 2 into the basic drawing line, the expansion drawing line, and the shrinkage drawing line. FIG. 10 is a diagram for explaining a true / false determination method for a printed material according to a second embodiment. It is a figure which shows the conventional spread image line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 18 Printed matter which has confidential information Base material 3 Background pattern 4, 19 Spread image line 4a Basic image line 4a + 1, 4a + 2 Expansion image line 4a-1, 4a-2 Shrinkage image line 4b Supplementary image line 5 One of spread image lines Part enlarged portion 6 Binary image data 7 Enlarged image data 8 Array replacement image data 9 Pixel concatenated image data 10 Extended conversion image data 11 Spread line data 12 and 16 Discriminator 13 Grid pattern (discriminator)
14a, 14b Reference position (discriminator)
15 White area (discriminator)
17 Ultraviolet lamp A, B Confidential information P Pixel a Image line width A Non-image line width C Vertical image line D Horizontal image line

Claims (6)

In a printed matter having confidential information composed of a plurality of image lines regularly arranged on at least a part of the substrate,
The plurality of image lines are basic image lines formed based on the confidential information;
One or more extended image lines arranged at predetermined intervals on the outer side with respect to the basic image line and / or one or more contracted image lines arranged at predetermined intervals on the inner side with respect to the basic image line. Consisting of at least
A printed matter having confidential information, wherein a vertical image line and a horizontal image line constituting the basic image line, the extended image line, and the contracted image line are substantially perpendicular to each other. The plurality of image lines are further arranged in a blank area generated when the expanded image line and the contracted image line are arranged with respect to the basic image line, thereby forming the supplement image line. 2. The printed matter having confidential information according to claim 1, wherein the vertical and horizontal image lines are substantially perpendicular. The printed matter having confidential information according to claim 1, wherein the plurality of image lines have the same image line width and non-image line width. In the plurality of image lines, the non-image line width of the basic image line and the expanded image line or the contracted image line arranged next to the basic image line is different from other non-image line widths, 3. The printed matter having confidential information according to claim 1, wherein the other non-image line widths are all equal. The printed matter having confidential information according to claim 1, wherein the basic image line is formed based on an outline of the confidential information. The basic image line is printed with functional ink, and the plurality of image lines other than the basic image line are printed with ink having no functionality, or the plurality of image data other than the basic image line. The image line is printed with an ink having functionality, the basic image line is printed with an ink having no functionality, and the ink having the functionality and the ink not having the functionality have the same color. A printed matter having confidential information according to claim 1, 2, 3, 4 or 5.

Images