JP6354079B2 - Copy forgery prevention printed matter - Google Patents

Description

  The present invention relates to a printing technique for preventing forgery of printed matter.

  In order to prevent printed materials such as tickets from being copied (counterfeited) by a copying machine such as a digital copying machine and used illegally, a change that can be grasped by the naked eye when copied by a copying machine is generated in the copied material. Various printing techniques have been proposed.

  For example, Patent Document 1 describes a two-color print product in which an image portion and a non-image portion are printed with a solid or tint block, and can be easily identified with the naked eye. An anti-copy printed matter is described in which an image portion and a non-image portion are printed by stripping together by a combination of two colors.

  Patent Document 2 is composed of colors such as purple, sepia, and indigo with low reflectance in a wavelength range of 500 nm to 600 nm, and prints a 50 to 80% halftone dot or line group as a background part. In addition, in the same color with a non-copyable area formed by solid-printing the tint block, the background halftone dots or lines should be of a density close to the resolution of the copying machine and copied with the copying machine. Describes a non-copyable form printed at an angle that causes moiré and is inclined with respect to the reading reference direction.

  Further, Patent Document 3 describes a non-copyable sheet on which a light-absorbing ink printing layer is printed in a plate including a background portion by halftone dots and a solid background pattern scattered all over the background portion. .

  Further, Patent Document 4 describes a color copy prevention printed matter in which a reversible thermochromic ink is used for one of characters and background and a normal printing ink is used for the other.

Japanese Patent No. 3306458 Japanese Patent No. 2990564 Japanese Patent Laid-Open No. 6-79992 JP 2000-6565 A

  As described above, various techniques have been proposed as printing techniques for causing a copy to have a change that can be recognized with the naked eye when copied by a copying machine. However, there are problems that special ink is required and the printing method is complicated.

  On the other hand, the present inventor reproduces a printed matter in which fine and thin lines (a group of regularly arranged parallel lines) that are difficult to recognize with the naked eye and in which the density of characters is expressed by a copying machine. We discovered a phenomenon in which the appearance of characters in objects changes greatly compared to the characters before copying (the characters themselves collapse).

  An object of one aspect of the present invention is to provide a novel printing technique for grasping with the naked eye that a copy is duplicated by a copying machine.

  One aspect of the present invention is a copy-forgery-preventing printed matter, in which a special image is printed that is a character or a figure expressed in light and shade with a fine pattern that is difficult to recognize with the naked eye. When copied, it causes a change in the copy that can be grasped by the naked eye. According to such a configuration, it is possible to grasp with the naked eye that the copy is duplicated by a copying machine without using special ink. Therefore, compared to the case of manufacturing using special ink or the case of manufacturing by a complicated printing method, the manufacturing cost can be reduced, and the degree of freedom of printed matter can be reduced because printing restrictions are reduced. Can be high.

  In the above configuration, the pattern includes parallel lines that are a plurality of lines arranged at intervals, and at least one of the thickness of the lines constituting the parallel lines and the spacing between the lines is: When copied by a copying machine, at least one of the line and the portion sandwiched between the lines may be set to a value that is not normally reproduced. According to such a configuration, it is possible to easily change the special image before and after copying while realizing a natural appearance with the naked eye (suppressing a sense of incongruity). The line here is not limited to a straight line, and includes, for example, a curve. Moreover, the space | interval of lines here is the width | variety of the part in which the line is not drawn. The thickness of the line is usually constant, but is not limited to this and may not be constant. Similarly, the spacing between the lines may not be constant. The pattern may be composed only of parallel lines, or may include portions other than the parallel lines.

  The said structure WHEREIN: 0.05-0.3 mm may be sufficient as the thickness of the said line which comprises the said parallel line. According to such a configuration, it is possible to make it difficult for the lines constituting the parallel lines to be normally reproduced when copied by a copying machine.

  The said structure WHEREIN: 0.05-0.3 mm may be sufficient as the space | interval of the said lines which comprise the said parallel line. According to such a configuration, when copied by a copying machine, it is possible to make it difficult to correctly reproduce the portion sandwiched between the lines constituting the parallel lines.

  In the above configuration, the pattern may be a collection of lines having the same shape regularly arranged at a constant pitch (for example, a single line). The pitch here refers to the distance between the center line of a line having a certain thickness (not necessarily constant) and the center line of another line. That is, the pitch is a value that is not affected by the thickness of the line. Moreover, the shape here means the shape of the line itself, such as a linear shape, an arc shape, or a wave shape.

  In the above configuration, the pattern may be a collection of a plurality of regularly arranged figures. Note that the parallel lines may be included in each figure, or may be formed by arranging the figures.

  In the above configuration, the background density of the special image may be expressed by a pattern having a pattern different from that of the special image. According to such a configuration, the background of the special image can be easily changed before and after copying, so that the difference in appearance before and after copying can be further increased.

  In the above configuration, a plurality of types of the special images having different patterns may be printed. According to such a configuration, when the pattern pattern that is likely to change before and after copying differs depending on the copying conditions, the probability that the pattern that tends to change is included in the printed matter can be increased.

  In the above-described configuration, even if the special image expressed by the first line of the first angle and the special image expressed by the second line of the second angle different from the first angle are printed. Good. According to such a configuration, when the change before and after copying differs depending on the orientation of the printed material set in the copying machine, the probability that the special image will change before and after copying can be increased.

  In the above configuration, a base layer may be formed on the surface of the printing substrate with the first color ink, and a second color ink layer representing the special image may be formed on the surface of the base layer. According to such a configuration, when the printing surface is smoother and the change is less likely to occur before and after copying, the smoothness of the surface can be impaired as compared with the case where the underlayer is not formed. Changes can be easily made.

It is a typical external view of the copy forgery prevention printed matter of embodiment. It is an enlarged view of the special image printed on the upper part or the lower part of the copy forgery prevention printed matter. It is the figure which expanded the special image further. It is a figure which shows the copy result at the time of copying the special image of embodiment with a copying machine. It is a figure which shows the example by which the multiple types of special image from which a line pattern differs was printed. It is a figure which shows the example in which the base layer was formed with the white ink on the surface of the printing base material. It is an enlarged view of the special image of a modification. It is the figure which expanded the special image of the modification further. It is a figure which shows the copy result at the time of copying the special image of a modification with a copying machine.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
FIG. 1 is a schematic external view of a copy forgery prevention printed matter 1 of the present embodiment. The copy forgery prevention printed matter 1 shown in FIG. 1 is obtained by directly printing characters, figures, photographs, etc. on the surface (one side or both sides) of a sheet-like printing substrate 10, and can be used in a specific store, for example. It is used as a discount ticket or a gold certificate. On the upper and lower portions 11 and 12 of the copy forgery-preventing printed matter 1, special images are printed that cause changes in the copy that can be grasped by the naked eye when copied with a copying machine (for example, the collapse of the characters themselves). Special images here are characters (including numbers and symbols) or figures that are sufficiently (clearly) recognizable with the naked eye, and the shading is expressed in a fine pattern that is difficult to recognize with the naked eye. It is a thing. In the central portion (the portion sandwiched between the upper part 11 and the lower part 12) of the copy forgery prevention printed matter 1, characters, figures, photographs, etc. (for example, “100 yen discount voucher”) according to the use of the copy forgery prevention printed matter 1 A photograph of the target product) may be printed.

  In addition, the use of the copy forgery prevention printed matter 1 is not limited to a discount ticket or a cash voucher, and may be used for other purposes. Further, the position where the special image is printed is not limited to the upper part 11 and the lower part 12 of the copy forgery prevention printed matter 1, and may be another position, for example. Further, the area where the special image is printed is not limited to a part of the area in the copy forgery prevention printed matter 1 but may be the whole area of the copy forgery prevention printed matter 1.

  FIG. 2 is an enlarged view of the special image C printed on the upper part 11 or the lower part 12 of the copy forgery prevention printed matter 1. FIG. 3 is an enlarged view of the special image C. As shown in FIGS. 2 and 3, the special image C of the present embodiment is a character that is sufficiently recognizable with the naked eye (in this example, the character “DTP”), and is so small that it is difficult to recognize with the naked eye. The shading is expressed by lines (a collection of straight lines (parallel lines) regularly arranged at a constant pitch). In this embodiment, the thickness of the lines constituting the line and the distance between the lines (the width of the part where the lines are not drawn) are constant, and the lines are sandwiched between the lines when copied by a copying machine. Is set to a value that cannot be reproduced normally. For example, the thickness of a line or the interval between lines such that a plurality of lines are mistakenly recognized as one thick line or the line itself is not recognized can be an example of “a value that cannot be reproduced normally”. The contents of the characters shown in FIGS. 2 and 3 are examples and are not particularly limited.

  Further, in the present embodiment, the density of the background B of the special image C is expressed by a line with a pattern different from that of the special image C. Specifically, the shade of the special image C is represented by vertical lines, and the shade of the background B is represented by horizontal lines. In this embodiment, the background B is also expressed in shades of fine lines that are difficult to recognize with the naked eye, and the thickness of the lines constituting the lines and the spacing between the lines are the same as when copied by a copying machine. The line and the portion sandwiched between the lines are set to values that cannot be reproduced normally.

  FIG. 4 shows a copy result (special image C of a duplicate) when the special image C shown in FIG. 2 is actually copied by a copying machine. As shown in FIG. 4, in the special image C of the duplicate, something such as moire or block noise is generated, and the special image C itself is distorted. In addition, the background B has collapsed. When closely observed, in this example, a portion where a plurality of lines are expressed as one line, a portion where the lines disappear, or the like is confirmed. These portions occur at irregular positions. Therefore, the appearance changes clearly from the copy-source special image C (FIG. 2).

  Various patterns can be used as the pattern of the special image C whose appearance changes before and after copying, and the degree of change may vary depending on the pattern. When the present inventor tested, the following tendency was confirmed. The present invention is not limited to the following numerical ranges.

  When the thickness of a line constituting a special image pattern (not limited to a single line) is in the range of 0.05 to 0.3 mm, particularly in the range of 0.1 to 0.2 mm. In addition, the appearance of special images has changed significantly. This numerical range is an example of a fine pattern that is difficult to recognize with the naked eye.

  When the distance between lines constituting a special image pattern (not limited to a single line) is in the range of 0.05 to 0.3 mm, in particular, in the range of 0.1 to 0.2 mm. In some cases, the appearance of special images has changed significantly. This numerical range is also an example of a fine pattern that is difficult to recognize with the naked eye.

  When the special image pattern and the background pattern are both lines, and the angle of the special image line with respect to the background line angle is in the range of 30 to 90 degrees, it is particularly 45 to 90 degrees. When it was within the range, the appearance of the special image changed greatly.

According to the embodiment detailed above, the following effects can be obtained.
The copy forgery prevention printed matter 1 is printed with a special image C which is a character or a figure (character in the present embodiment) expressed in light and shade with a fine pattern that is difficult to recognize with the naked eye, and the special image C is a copy machine. Changes that can be grasped with the naked eye when copied (in this embodiment, collapse of the special image C and collapse of the background B) are caused in the duplicate. Therefore, according to the copy forgery prevention printed matter 1, it is possible to grasp with the naked eye that it is a duplicate copied by a copying machine without using special ink. As a result, the manufacturing cost can be reduced compared to the case where the ink is manufactured using special ink or the case where the ink is manufactured by a complicated printing method, and the printing restrictions are reduced. The degree can be increased.

  In the copy forgery prevention printed matter 1, the pattern expressing the shade of the special image C includes parallel lines (in this embodiment, parallel lines) that are a plurality of lines arranged at intervals (parallel lines in this embodiment). Only consists of). Then, at least one of the thicknesses of the lines constituting the parallel lines (one line) and the distance between the lines (both in the present embodiment) is sandwiched between the lines when copied by a copying machine. At least one of the portions (both in the present embodiment) is set to a value that is not normally reproduced. Therefore, according to the copy forgery prevention printed matter 1, it is possible to easily cause a change in the special image C before and after copying while realizing a natural appearance with the naked eye (suppressing a sense of incongruity).

  In the copy forgery prevention printed matter 1, the density of the background B of the special image C is expressed by a pattern having a pattern different from that of the special image C (in this embodiment, a line). Therefore, according to the copy forgery prevention printed matter 1, since the background B of the special image C can be easily changed before and after copying, the difference in appearance before and after copying can be further increased.

As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention can take a various form, without being limited to the said embodiment.
(1) Even if the same special image C is used, the appearance changes before and after copying depending on the copying conditions (for example, the type of copying machine used for copying and the orientation of printed matter set in the copying machine) Can be different. Therefore, as shown in the schematic diagram of FIG. 5, for example, a plurality of types of special images C1 and C2 having different patterns (in this example, lines) may be printed on the copy forgery prevention printed matter 1. According to such a copy forgery prevention printed matter 1, when the pattern of a pattern that easily changes before and after copying varies depending on the copying conditions, the probability that the pattern that tends to change is included in the copy forgery prevention printed matter 1 can be increased. it can.

  In the example of FIG. 5, a special image C1 expressed by a single line of a first angle (90 degrees when the horizontal direction is 0 degrees) and a second angle (45 degrees) different from the first angle. A special image C2 represented by a line is printed. According to such a copy forgery prevention printed matter 1, when the change before and after copying differs depending on the orientation of the printed matter set in the copying machine, etc., the probability that the special image C will change before and after copying can be increased. it can.

  (2) In the above embodiment, the copy forgery prevention printed matter 1 in which characters, figures, photographs, and the like are directly printed on the surface of the printing substrate 10 is illustrated, but the present invention is not limited to this. For example, as shown in FIG. 6, the base layer 20 is formed of white (colorless) ink on the surface of the printing substrate 10, and a color representing a line (for example, a single line) expressing the density of the special image C or the background B. An ink layer 30 of (for example, black) ink may be formed on the surface of the base layer 20. According to such a configuration, the smoothness of the surface can be impaired as compared with the case where the underlayer 20 is not formed when the change in the special image C hardly occurs before and after copying as the printing surface becomes smoother. The special image C can be easily changed before and after copying.

  That is, when the effect (change in the special image C) by printing as in the above-described embodiment was tested with a plurality of types of printing base materials, the smoother the printing surface, the lower the effect (the change in the special image C becomes smaller). ) Specifically, when three types of high-quality paper, matte coated paper, and coated paper are compared, the effect is highest when printed on high-quality paper, and the effect is lowest when printed on coated paper. This is presumably because the larger the degree of irregular reflection of the irradiation light when reading a document in a copying machine, the more easily the content to be read is disturbed.

  Therefore, as shown in FIG. 6, according to the configuration in which the foundation layer 20 is formed on the surface of the printing substrate 10, the foundation layer 20 is not formed particularly when the printing surface of the printing substrate 10 is smooth. Compared with the configuration, it is possible to impair smoothness (increase fine irregularities). Specifically, the unevenness can be formed by embossing the base layer 20, for example. As a result, even when coated paper is used, for example, the change before and after copying can be increased.

  The underlayer 20 does not have to be solid and may be a pattern (background pattern). For example, a line may be printed with white ink to form the underlayer 20 and printed with colored ink from above. In this way, the unevenness can be formed larger. A transparent ink may be used as the colorless ink.

  (3) In the above-described embodiment, the lines are exemplified as the special image pattern, but the present invention is not limited to this. For example, a similar effect can be obtained even if a collection of a plurality of regularly arranged figures, such as a lattice pattern, includes parallel lines that are a plurality of lines arranged at intervals. Note that the parallel lines may be included in each figure, or may be formed by arranging the figures.

  FIG. 7 is a diagram illustrating a special image Cv according to a modified example, and FIG. 8 is an enlarged view of the special image Cv according to the modified example. As shown in FIGS. 7 and 8, the special image Cv of the modified example is a character that is sufficiently recognizable with the naked eye (in this example, the character “DTP”), and is a fine figure that is difficult to recognize with the naked eye. The density is expressed by (square lattice pattern). The lines constituting the figure are along one of the first direction (horizontal direction) and the second direction (longitudinal direction), and the lines along each direction are parallel to each other (a constant distance from each other). ) The thickness of at least a part of the lines and the distance between the lines are set to values at which the line and the part sandwiched between the lines are not normally reproduced when copied by a copying machine. Note that the contents of the characters shown in FIGS. 7 and 8 are examples, and are not particularly limited.

  In addition, the density of the background Bv of the special image Cv is expressed by a graphic having a pattern different from that of the special image Cv (a graphic having different thicknesses of lines constituting a square). The background Bv is also expressed in light and shade with fine figures that are difficult to recognize with the naked eye, and the thickness of at least some lines and the spacing between the lines are sandwiched between the lines when copied by a copying machine. Is set to a value that cannot be reproduced normally.

  FIG. 9 shows a copy result (special image Cv of a duplicate) when the special image Cv shown in FIG. 7 is actually copied by a copying machine. As shown in FIG. 9, also in the modified example, changes similar to those in the above-described embodiment (disruption of the special image Cv itself and collapse of the background Bv) occur.

  (4) The special image and the pattern expressing the density of the background may include a plurality of curves arranged at intervals. That is, the parallel lines are not limited to straight lines, and the above-described effects can be obtained even if they are curved lines. Examples of the curve include an arc-shaped line, a wavy line, and a line forming a circle or an ellipse.

  (5) In the above embodiment, the case where the thickness of the lines constituting the parallel lines is constant is illustrated, but the present invention is not limited to this, and the thickness may not be constant (for example, gradually changes). May be) Also in this case, as described above, when the thickness of the line is in the numerical range described above (in the range of 0.05 to 0.3 mm, particularly in the range of 0.1 to 0.2 mm), The lines constituting the parallel lines can be made difficult to reproduce normally. Similarly, the interval between the lines constituting the parallel line may not be constant (for example, it may change gradually). Also in this case, as described above, when the distance between the lines is in the numerical range described above (in the range of 0.05 to 0.3 mm, particularly in the range of 0.1 to 0.2 mm), The lines constituting the parallel lines can be made difficult to reproduce normally.

(6) The copy forgery prevention printed matter may be subjected to anti-counterfeit measures (for example, printing using special ink) other than the above embodiment.
(7) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Further, at least a part of the configuration of the above embodiment may be replaced with a known configuration having the same function. Moreover, you may abbreviate | omit a part of structure of the said embodiment as long as a subject can be solved. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present invention.

  (8) The present invention can be realized in various forms such as the above-described copy forgery prevention printed matter 1 and a method for manufacturing the copy forgery prevention printed matter 1.

  DESCRIPTION OF SYMBOLS 1 ... Copy forgery prevention printed matter, 10 ... Printing base material, 11 ... Upper part, 12 ... Lower part, 20 ... Underlayer, 30 ... Colored ink layer, B, Bv ... Background, C, C1, C2, Cv ... Special image.

Claims (12)

A sufficiently recognizable characters or graphics with the naked eye, shading in fine pattern to the extent that hardly recognized is printed special image is the character or graphics are expressed by the naked eye,
When the special image is copied by a copying machine, the special image itself collapses as a change that can be grasped with the naked eye .
The pattern includes parallel lines that are a plurality of lines spaced apart from each other,
When at least one of the thickness of the line and the interval between the lines constituting the parallel line is copied by a copying machine, at least one of the line and the portion sandwiched between the lines is normal. It is set to a value that is not reproduced,
The thickness of the lines constituting the parallel lines is 0.05 to 0.3 mm,
An underlayer is formed of the first color ink on the surface of the printing substrate;
Copying anti-counterfeit printed matter characterized in that the ink layer of a second color representing the special image that has been formed on the surface of the underlying layer. The anti-counterfeit printed matter according to claim 1 ,
The copy forgery prevention printed matter, wherein an interval between the lines constituting the parallel lines is 0.05 to 0.3 mm. A sufficiently recognizable characters or graphics with the naked eye, shading in fine pattern to the extent that hardly recognized is printed special image is the character or graphics are expressed by the naked eye,
When the special image is copied by a copying machine, the special image itself collapses as a change that can be grasped with the naked eye .
The pattern includes parallel lines that are a plurality of lines spaced apart from each other,
When at least one of the thickness of the line and the interval between the lines constituting the parallel line is copied by a copying machine, at least one of the line and the portion sandwiched between the lines is normal. It is set to a value that is not reproduced,
The interval between the lines constituting the parallel lines is 0.05 to 0.3 mm,
An underlayer is formed of the first color ink on the surface of the printing substrate;
Copying anti-counterfeit printed matter characterized in that the ink layer of a second color representing the special image that has been formed on the surface of the underlying layer. The anti-counterfeit printed matter according to any one of claims 1 to 3 ,
The copy forgery-preventing printed matter, wherein the pattern is a group of lines having the same shape regularly arranged at a constant pitch. The anti-counterfeit printed matter according to any one of claims 1 to 3 ,
The copy forgery prevention printed matter, wherein the pattern is a collection of a plurality of regularly arranged figures. The copy forgery prevention printed matter according to any one of claims 1 to 5 ,
A copy-forgery-preventing printed matter, wherein the background of the special image is expressed by a pattern having a pattern different from that of the special image. The copy-forgery prevention printed matter according to any one of claims 1 to 6 ,
A plurality of types of the special images having different patterns are printed. The copy forgery prevention printed matter according to claim 7 ,
The special image represented by a first angled line;
The special image represented by a line at a second angle different from the first angle;
A copy-forgery-preventing printed matter characterized in that is printed.   The copy forgery prevention printed matter according to any one of claims 1 to 8,
  The underlayer is embossed
  A copy forgery prevention printed matter characterized by the above.   The copy forgery prevention printed matter according to any one of claims 1 to 8,
  The underlayer is a pattern
  A copy forgery prevention printed matter characterized by the above.   It is a copy forgery prevention printed matter according to any one of claims 1 to 10,
  The foundation layer is formed of white ink.
  A copy forgery prevention printed matter characterized by the above.   It is a copy forgery prevention printed matter according to any one of claims 1 to 10,
  The underlayer is formed of a transparent ink.
  A copy forgery prevention printed matter characterized by the above.