JPH088139Y2 - Document forgery prevention method and forgery prevention paper - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a document forgery prevention method and an anti-counterfeit paper, and more specifically, it is a document such as securities or a certificate that needs to be prevented from being forged by a copying machine. A method to prevent counterfeiting of documents by displaying warning characters and symbols that are difficult to recognize with the naked eye but are clearly recognized when copied with a copying machine And an anti-counterfeit paper used for producing such a document.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing forgery of a document, "copy" or "illegal copy" is applied to a printing paper for producing the document.
There is a method of printing warning characters such as that embedded in a camouflage pattern in the background pattern. When such a printing paper is viewed with the naked eye, the warning character is integrated with the background pattern and is almost unrecognizable. When a predetermined character or image is printed on the printing paper, the printed character image is clearly displayed on the background pattern, so there is no problem in the normal use as a printed matter, that is, a document. However, when a copy is made from such a printed matter with a copying machine such as an electronic copying machine, the warning character is clearly displayed, which indicates that the act is improper.

In order to clearly display only the warning character at the time of copying, the warning character and the background pattern have different copying characteristics for the copying apparatus. In particular,
For example, the background pattern is displayed as a set of small points that cannot be reproduced due to the restrictions of the reading accuracy or expression accuracy of the copying machine, and the warning character is a set of relatively large points that can be clearly reproduced by the copying apparatus. Will be displayed. When the printed matter is viewed with the naked eye, the background pattern and the warning character are visually recognized in the same way, so the warning character cannot be recognized due to the camouflage effect.However, when a copy is made, the background pattern is not copied and only the warning character is displayed. Since it is clearly copied, the warning characters are displayed in a raised manner.

[0004]

However, in the conventional forgery prevention method as described above, the warning character may not be clearly displayed depending on the copying apparatus for copying, which is insufficient in the forgery prevention function. . That is, there are many types of copying machines depending on their structures and manufacturing companies. Moreover, there are differences in copying characteristics depending on the model. Therefore, even if the same combination of the warning character and the background pattern is used on the anti-counterfeit paper, there is a large difference in the copying characteristics between the warning character and the background pattern, or there is almost no difference. If the difference in the copy characteristics is small, when the copy is made, both the warning character and the background pattern are clearly displayed, the warning character cannot be recognized due to the camouflage effect, and neither the warning character nor the background pattern is displayed. Therefore, the anti-counterfeit function cannot be achieved.

Therefore, in the conventional anti-counterfeiting method, even if the certain copying apparatus can perform the certain anti-counterfeiting function, another copying apparatus cannot fulfill the anti-counterfeiting function at all. However, this makes the anti-counterfeiting function less reliable. Therefore, an object of the present invention is to create a document forgery prevention method that can surely achieve forgery prevention even if copying machines of various structures or manufacturing companies are used, and a document to be used in such a forgery prevention method. To provide anti-counterfeit paper for.

[0006]

A document forgery prevention method according to the present invention which solves the above-mentioned problems is to display a warning pattern and a background pattern in a camouflage manner on the surface of the document, and display the warning pattern and the background pattern. the difference in replication properties, the copy of a forgery preventing method of the documents to a warning pattern is clearly recognized, each warning putter
And the background pattern are combined and displayed in different colors.
The plurality of color areas are arranged on the same document surface .

As the documents, like the above-mentioned securities and certificates, letters, numbers, symbols and other figures are printed or displayed by hand on the surface of the document, and the documents are provided with such description items. However, it is not effective unless it is a legitimately produced original, and if it is necessary to prevent forgery of a document by copying, it can be applied to a document having any application, material, shape, and description items.

As the paper for producing the documents, those made of various paper materials or shapes used for the securities mentioned above are used. The warning pattern and the background pattern may be displayed in advance by a means such as printing on the paper before printing or handwriting the above-mentioned predetermined items, or when printing the predetermined items on the paper. ,
The warning pattern and the background pattern can be printed at the same time.

For the warning pattern and the background pattern, various characters, symbols, patterns, and combinations thereof, which are also used in the conventional normal forgery prevention method, are used. For example, the warning pattern includes "copy" and "copy".
Characters such as "unauthorized duplication" and "NO", symbols such as "x", or bar lines, hatching lines, or other character images or patterns that can be easily recognized as non-genuine documents are used. The background pattern need only have a camouflage effect that prevents the characters and symbols of the warning pattern from being read when displayed on a document together with the warning pattern. Various geometric patterns, irregular patterns, and aggregate patterns of small characters and symbols. Are used.

The warning pattern and the background pattern are printed in such a manner that the reproducibility of reading and display at the time of copying by the copying apparatus, that is, the copying characteristics are different. As a means for making a difference in copy characteristics, various means employed in the conventional ordinary forgery prevention method are used. Specifically, for example, if the warning pattern and the background pattern are represented by a set of small points, and the size of the points forming the warning pattern and the size of the points forming the background pattern are made different, the copy characteristics Can be different. Instead of small dots, a set of minute patterns and character symbols can represent the characters and patterns that make up the warning pattern and the background pattern. In general, when the size of a character or pattern is small, it is difficult to copy due to restrictions such as the resolution of the optical system of a copying machine or the pattern forming accuracy of toner. Is
Can be fully duplicated. Therefore, if the warning pattern is composed of large dots and the background pattern is composed of small dots, the background pattern is not copied at the time of copying, and only the warning pattern is copied and displayed in a clearly recognized state. On the contrary, if the warning pattern is more difficult to be copied and the background pattern is made easier to copy, the warning pattern that is not copied is a blank character or a symbol in the background pattern that is clearly recognized during copying. Will be displayed as.

The warning pattern and the background pattern may be displayed on the entire surface of the document, or may be displayed only on a part of the document. When the warning pattern is composed of a meaningful combination of characters and symbols, it is preferable that such a warning pattern is displayed in at least a plurality of places on one document. The plurality of warning patterns may be displayed side by side in one row or a plurality of rows in the background pattern, may be arranged vertically and horizontally, or may be arranged in a staggered pattern. Further, the warning pattern may be arranged in accordance with the printing position of a predetermined character or a figure printed on the printed matter.

Such warning patterns and background patterns are displayed using a plurality of colors which are different depending on the location. As the display color, any color can be used as long as it does not hinder the display of the character image to be described on the document. Although the combination of the colors and the number of colors forming the plurality of colors can be freely selected, a combination having different wavelength wavelength components is preferable. Further, it is preferable that many colors from short wavelength color to long wavelength color are included. Specifically, appropriate colors are selected and combined from the seven colors forming visible light from purple to red, but all seven colors may be used. A relatively pale color is preferred so that it does not interfere with the textual representation on the document. Of various copying machines,
If the difference in the copying characteristics with respect to the color is known, it is preferable to select and combine the colors to be copied well for each of various copying apparatuses that are likely to be used for forgery of documents. In general, since the irradiation wavelength distribution of the light sources used in the copying apparatus affects the copying characteristics with respect to color, it is possible to analyze the irradiation wavelength distribution of various light sources to determine a good combination. Multiple colors may be displayed with each color part clearly separated, but at the boundary of adjacent color parts, it is displayed so that one color gradually changes to the other. You can also keep it. Printing in the so-called rainbow pattern, in which the seven colors of visible light described above change continuously, gives an excellent appearance design.

The warning pattern is printed from different colors on the document surface.
It is necessary that at least one is displayed in each of the plurality of color areas . As described above, when a warning pattern in which characters and the like are combined is arranged in a plurality of places, a warning pattern composed of a combination of predetermined characters and the like is arranged together with the background pattern in each of different color areas. All clauses to so that. However, when many warning patterns are arranged, some warning patterns have different colors.
It may be arranged to extend over the area .

[0014]

As a result of examining the copying characteristics of various copying apparatuses, the inventor of the present application has found that the difference in the colors printed with the warning pattern and the background pattern greatly affects the difference in the copying characteristics. That is, even if the warning pattern and the background pattern are printed with a predetermined difference in the copy characteristics by changing the sizes of the dots forming the warning pattern and the like, if the printing colors are different, the warning pattern There is a large difference in the copying characteristics between the background pattern and the background pattern, or there is almost no difference. It is considered that the difference in the copying characteristics due to the difference in the printing color is based on the difference in the characteristics of the light source, the optical system, the light receiving element, and the like that constitute the copying apparatus.

Therefore, a warning pattern and a background pattern are respectively provided.
Multiple colors displayed in different colors combined with
If the areas are arranged on the same document surface, even if the copying apparatus changes, in the area of the color where the copying characteristics of the warning pattern and the background pattern can be greatly different in the copying apparatus,
The warning display by the warning pattern will clearly appear on the copy. If the number of different colors is two, it is an effective anti-counterfeiting method for two types of copying machines that can handle either of the color regions, and the number of different colors, that is, the color regions
The increase in the number of C.I.s. is an effective anti-counterfeiting method for any of a wider range of copying machines.

In a normal copying apparatus, a color having different copying characteristics between the warning pattern and the background pattern exists in any of visible light from red to purple, and to some extent within the range of colors capable of performing the counterfeit prevention function. Therefore, by combining appropriate colors among the seven colors from red to purple or using all seven colors, an effective anti-counterfeiting function can be achieved for almost all copying machines.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the structure of the anti-counterfeit paper. On the surface of the paper 10, a warning pattern 12 composed of a combination of characters "copy"
And a background pattern 14 having an irregular pattern are printed and displayed. A large number of warning patterns 12 are arranged in a zigzag pattern on the entire surface of the paper 10 at intervals in the vertical and horizontal directions. Since the background pattern 14 and the warning pattern 12 are clearly displayed integrally, the characters of the warning pattern 12 cannot be clearly read.
It should be noted that in the figure, the outline is represented by a dotted line in order to make it easy to recognize the existence of the warning pattern 12, but in reality, there is no such outline of the dotted line, and the warning pattern 12 is buried in the background pattern 14. Then, it cannot be recognized with the naked eye.

FIG. 3A shows the detailed structure of the warning pattern 12 and the background pattern 14. Both the warning pattern 12 and the background pattern 14 are displayed as a set of fine dots. However, the background pattern 14 uses very small dots, while the warning pattern 12 uses relatively large dots. Further, the patterns of these points are displayed so as to be continuously connected from the background pattern 14 to the warning pattern 12. Although the outline of the warning pattern 12 is shown by a dotted line also in this figure, such a dotted line does not actually exist. With the naked eye, the difference between the points forming the background pattern 14 and the warning pattern 12 cannot be clearly discriminated, and the background pattern 14 and the warning pattern 12 are integrally recognized by the continuous pattern of points. , Warning pattern 12
You cannot read the characters.

In this embodiment, when printing the warning pattern 12 and the background pattern 14 as described above, FIG.
As shown in, the color of the printing ink used for the constant width C ₁ on the left side of the paper 10, the color of the printing ink used for the constant width C ₂ at the center, and the color of the printing ink used for the constant width C ₁ on the right side I'm wrong. Specifically, C ₁ is yellow, C ₂ is red, C
₃ is blue. Each printing color is lightly printed in a relatively pale color, which makes it easy to see the items to be described on the document surface, which will be described later. At least one warning pattern 12 is arranged in each of the areas C ₁ , C ₂ , and C ₃ . As described above, a known printing method is applied to a unit that prints on one sheet 10 using a plurality of printing inks. Specifically, the conventional monochromatic warning pattern 1
It is also possible to print on paper as in this embodiment by using a printing original plate for printing the second and background patterns 14 and an offset one-color printing press.

On the paper 10 having the above-mentioned structure, characters, numbers, symbols, etc. may be printed on it, printed by a printer or the like, or numbers and signatures may be written by hand. By combining them, predetermined items are displayed and a document is created. As described above, the warning pattern 12 is recognized as a simple ground pattern together with the background pattern 14, so that it can be used favorably as a document without interfering with the items described in the document.

FIG. 2 shows a copy 20 obtained by copying a document prepared from the above-described paper 10 with a copying machine such as an electronic copying machine. In addition, in order to make the explanation easy to understand, the items to be described on the document are not shown. In the C ₂ area and the C ₃ area of the copy 20, the warning pattern 22b and the background pattern 24b are displayed with the same degree of clarity. Therefore, the warning pattern 22b cannot be read due to the camouflage effect of the background pattern 24b. Therefore, these C ₂ area and C ₃ area have no function of preventing forgery due to copying. This is because the color of the printing ink used for printing the warning pattern 12 and the background pattern 14 on the paper 10 has almost no difference in the copying characteristics between the warning pattern 12 and the background pattern 14 in the copying machine used.

On the other hand, in the C ₁ area, the warning pattern 22a is clearly copied, but nothing is copied in the portion 24a which should be the background pattern. Therefore, only the warning pattern 22a is clearly recognized on the plain surface, indicating that this document is a "copy", that is, a forged document. This state is shown in detail in Fig. 3 (b), and the portion 24 that should be the background pattern
Although nothing is displayed in a, warning pattern 2
In 2a, the points that make up a given character are clearly copied. It should be noted that the size of each point forming the warning pattern 12 printed on the paper 10 of FIG. 3 (a) is copied in an enlarged state in the copy 20, and therefore the warning pattern 22a is more detailed. It is clearly displayed. This is because a general copying apparatus has a property that dots or lines are enlarged or adjacent points or lines are connected due to the influence of the toner pattern forming accuracy in the copying process. In this way, only the warning pattern 12 is clearly copied because the color of the printing ink on which the warning pattern 12 and the background pattern 14 are printed on the paper 10 is the warning pattern 12 in the copying machine used.
And the background pattern 14 causes a large difference in copying characteristics.

As a result of the above, the paper 10 of this embodiment is C
_Even if the copying machine is equipped with copying characteristics such that the forgery prevention function cannot be achieved with the printing colors of the ₂ area and the C ₃ area,
The warning display for preventing forgery can be surely displayed clearly. If a copying apparatus that does not show a difference in the copying characteristics between the warning pattern 12 and the background pattern 14 is used as the copying apparatus in the printing color of the C ₁ area, C
_Since the warning pattern 12 and the background pattern 14 have different copy characteristics in either the area ₂ or the area C ₃ , the copy 20 has a portion 2 which becomes the background pattern.
4a is plain and only the warning pattern 22a is clearly displayed.

Therefore, the paper 10 of this embodiment is C
_For any of a very wide range of copying machines, a copying machine suitable for the printing color of the ₁ area, a copying machine suitable for the printing color of the C ₂ area, and a copying machine suitable for the printing color of the C ₃ area, It becomes possible to perform a reliable anti-counterfeit function.

[0025]

Described above to the invention the effect of], according to the anti-counterfeiting methods and anti-falsification paper documents according to this invention, respectively warning
Different colors by combining the notification pattern and the background pattern
By arranging a plurality of color areas displayed in the same document surface, in any one of the plurality of color areas ,
If the copying apparatus has a difference in copying characteristics between the warning pattern and the background pattern, the function of preventing forgery can be achieved for all copying apparatuses .

As a result, it is possible to more reliably achieve the prevention of forgery of various documents by solving the problem that the forgery prevention function could not be sufficiently fulfilled when the copying apparatus was changed. Moreover, in this invention, only a plurality of colors are used when displaying a warning pattern or a background pattern for prevention of forgery by printing, and other processes and devices such as a printing machine are similar to the conventional processes and devices. Since it can be used, there is no concern that the cost for preventing forgery will increase, and reliable forgery prevention can be performed at low cost.

[Brief description of drawings]

FIG. 1 is a plan view of an anti-counterfeit paper showing an embodiment of the present invention.

[Figure 2] Plan view of the copy

[Fig. 3] (a) is a printed matter and (b) is a duplicated enlarged plan view around the warning pattern.

[Explanation of symbols]

10 Anti-counterfeit Paper 12 Warning Pattern 14 Background Pattern 20 Copy 22a, 22b Warning Pattern 24a, 24b Background Pattern C _{1 to} C ₃ Areas with Different Colors

Claims (2)

[Scope of utility model registration request] 1. A document in which a warning pattern is displayed in a camouflage state together with a background pattern on a document surface so that the warning pattern can be clearly recognized in a copy due to a difference in copying characteristics between the warning pattern and the background pattern. Anti-counterfeiting method, in which warning patterns and background patterns are combined.
Multiple color areas that are combined and displayed in different colors
A method for preventing forgery of documents, which is characterized in that it is placed on a similar surface . 2. A warning pattern is displayed on the surface in a camouflage manner together with a background pattern, and the warning pattern is clearly recognized in a copy due to the difference in copying characteristics between the warning pattern and the background pattern. This is anti-counterfeit paper, which is composed of a warning pattern and a background pattern.
With multiple color areas that are matched and displayed in different colors
Anti-falsification paper which is characterized in that there.