JP3370753B2 - Anti-counterfeit printing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check, stock certificate, gift certificate, gift certificate, lottery ticket, boarding ticket, bankbook, credit card, I which can prevent copy forgery by a color copying machine.
The present invention relates to printed matter such as D cards, cash cards, and prepaid cards.

[0002]

2. Description of the Related Art In recent years, with the development of color copying machines, it has become possible to make fine copying which is difficult to distinguish from the real one, and forgery of securities, checks, bills, etc. by copying has occurred. These copy-counterfeit printed materials can be easily verified for their authenticity by a skilled appraiser, but there are many types of securities and the like, which are widely distributed and often handled by the general public. Therefore, it is not possible to rely on only a skilled person to determine the authenticity of all securities and the like, and it is preferable that a general person can easily make a determination. As such a method, there is a conventionally known technique that utilizes the difference between the human relative visual sensitivity and the spectral sensitivity of the special color material. An example of a printed matter provided with such an anti-counterfeiting measure is described in Japanese Patent Application Publication No. 55062 of 1988.

[0003]

This prior art is an anti-counterfeiting technology which utilizes the difference between the human visual acuity and the sensitivity of a copying machine. That is, in order to prevent counterfeiting of printed matter, a special pattern is used to form a desired pattern in a region where human visual acuity is low, which has a high spectral reflectance. Therefore, applicable color materials are 450-650n
Only a limited amount of colorant can be used under the condition that it has a high reflectance in the region of m and 450 nm or less or 650 nm or more.

In view of the above-mentioned circumstances, the present inventors have previously described a normal colorant (first colorant) and a colorant having a high spectral reflectance in the entire visible light region (second colorant). Of the anti-counterfeit ink and its printed matter (1993 patent application No. 108831). The principle of a color copier is to illuminate a printed matter that is an original, separate the reflected light with three types of color filters of red, green, and blue to extract the three primary color components of cyan, magenta, and yellow. Toners of respective colors corresponding to the three primary color components, and in some cases black to which four colors are added, are mixed to reproduce colors on a copy. In the color copying machine, the inventors of the present invention have found that when the reflected light amount of the original is increased, a part of a specific color separation component, for example, a yellow component becomes difficult to be recognized by a photoconductor of a normal color copying machine. More specifically, the printed matter printed using the anti-counterfeiting ink, which has been found, specifically, the first colorant that is a colored ink and the second colorant that increases the amount of reflected light, is printed with only the first colorant. Compared to printed matter, the amount of reflected light on the surface of the printed matter increases during copying, so certain color separation components of the three primary colors, such as the yellow component, which is the brightest color separation component, are affected and recognized by the photoconductor of the color copying machine. That is, the balance with other cyan and magenta is lost and color reproduction cannot be faithfully performed. As a result, compared with the original printed matter, the copy becomes a color tone with the yellow component omitted, and the forgery can be easily discriminated.

However, since the above ink mainly contains white ink as a component for increasing the spectral reflectance, there are cases in which sufficient printability cannot be obtained.
Further, in the conventional technology that utilizes the difference in human visual acuity from the sensitivity of a copying machine, the printing conditions become more severe as the accuracy of the copying machine improves, so it is desirable to develop a more reliable anti-counterfeiting technology. . Therefore, the present invention uses a combination of the above-described effect of applying the spectral reflectance and the effect of applying the difference between the resolution of the human visual acuity and the resolution of the copying machine. It is intended to provide a printed matter having a constitution in which a similar anti-counterfeiting effect can be obtained without using a special anti-counterfeiting ink containing the colorant.

[0006]

To this end, the anti-counterfeit printed matter of the present invention is made visible by a colored ink containing pigment in the range of 1 to 15% by weight on the surface of the substrate of the printed matter. The spectral reflectance of the portion overlapping with at least a part of the area where information is formed is 40% or more,
It is characterized in that a yellow component, which is a color separation component obtained from the colored ink, is influenced so that the color tone of the colored ink forming the visible information is changed and copied.

[0007]

When this printed matter is copied by a color copying machine, it can be visually discriminated that it is a copy by a color change effect or a combination of a color change effect and a color erasing effect.

That is, in the anti-counterfeit printed matter of the first embodiment of the first invention, a base material having a spectral reflectance of at least 40% is used to enhance the spectral reflectance of the printed matter. Therefore, the amount of reflected light at the time of copying increases, and it is a specific color separation component of the three primary color components of cyan, magenta, and yellow obtained from the colored ink layer formed on the substrate, for example, the brightest color separation component. The yellow component is affected and becomes difficult to be recognized by the photoconductor of the color copying machine, and the balance with other cyan and magenta is lost. As a result, the color reproduction is not faithfully performed, and compared to the original printed matter, the copy has a discolored color tone, and it is possible to easily determine that the copy is a counterfeit.

When the spectral reflectance of the substrate is lower than 40%, the color reproduction of the color copying machine can be supported, and the discoloring effect is not exhibited. Further, since the colored ink layer for forming visible information on the substrate contains the pigment in an amount of 1 to 15% by weight, it is possible to obtain a concentration that does not impair the high reflectance of the substrate. If the ratio of the pigment is higher than 15%, the color becomes dark and the amount of reflected light required for the color change effect cannot be obtained, and if it is lower than 1%, the color of the colored ink layer itself cannot be recognized by the color copying machine.

When a white base material or a base material having a white layer on the surface is used as the base material, a base material having a spectral reflectance of 40% or more can be obtained. Further, if the surface of the substrate is divided into a region having a spectral reflectance of 40% or more and a region having a spectral reflectance of less than 40%, the colored ink layer provided in the former region is discolored during copying, while the latter region is discolored. Since the colored ink layer provided on the sheet is copied without discoloration, it can be more easily discriminated as a counterfeit. Further, if the visible information is formed by the colored ink layers of a plurality of colors, the copy will be more significantly discolored.

In the anti-counterfeit printed matter of the second embodiment of the first invention, the spectral reflectance of this printed matter is increased to the ordinary printed matter in which the visible information is formed by the colored ink layer on the substrate. As a layer, a white layer is formed so as to overlap at least a part of the colored ink layer. Therefore, in the portion where the white layer is formed on the colored ink layer, the amount of reflected light at the time of copying is increased by 20% or more, which is similar to the forgery-preventing printed matter of the first embodiment, in comparison with the original printed matter It becomes a discolored copy, and it is possible to easily discriminate it as a counterfeit.

In the anti-counterfeit printed matter of the second invention,
When a printed image, which is visible information, is formed by the density of specific halftone dots, it is more easily discriminated as a counterfeit by the local discoloration and erasing of the image when copied with a color copier. It becomes possible to do.

[0013]

EXAMPLES The details of the present invention will be described below with reference to examples. FIG. 1 shows the anti-counterfeit printed matter 1a of the first embodiment, which has a base material and an ink layer formed thereon, and has a spectral reflectance of 40% on the surface of the anti-counterfeit printed matter 1a. It is necessary to be above. In order to obtain the spectral reflectance of this numerical value, in this embodiment, the colored ink layer 12 containing the pigment in the range of 1 to 15% by weight on the base material 11a having a surface spectral reflectance of at least 40% or more.
The visible information 14 is formed by.

The substrate 11a is used to increase the spectral reflectance of the anti-counterfeit printed matter 1a in addition to its original function of supporting the ink layer, and the surface spectral reflectance is at least 40%. Polymer sheets or polymer films such as polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyolefin, polystyrene, polyethylene terephthalate, polyvinyl acetate, polycarbonate, etc., or composite base materials or high-quality paper made of these polymers, synthetic A paper material such as paper can be used. The thickness of the base material 11a can be appropriately determined depending on the use of the anti-counterfeit printed matter 1a.

When the substrate has a spectral reflectance of less than 40%,
Since the color reproduction of the color copying machine can be supported, the discoloration effect will not be exhibited.
In the case of the anti-counterfeit printed matter 1b used as 1b, as shown in FIG. 2, a base layer is formed by a printing method such as a gravure printing method or an offset printing method using a white ink composed of a white pigment prior to the printing of the colored ink layer 12. By forming the white layer 13 on the surface of 15, it is possible to use the base material 11b having a spectral reflectance of 40% or higher.

The white ink forming the white layer 13 is a white pigment such as titanium white, zinc white, lithopone, antimony white, zirconium oxide or the like, or an extender pigment such as calcium carbonate, silica or alumina. A vehicle and an additive may be added to the mixture to prepare an ink to be used. At this time, if the content ratio of the white pigment is 1% or more by weight, a sufficient spectral reflectance can be obtained as the base material 11b. Further, even if the material has a spectral reflectance of less than 40%, a substrate having a spectral reflectance of 40% or more can be obtained by kneading the above-mentioned white pigment at the time of molding the substrate.

The white layer 13 may be formed on the entire surface of the base layer 15, but the white layer 13 is formed on a part of the surface of the base layer 15 so that the surface of the base material 11b becomes a region having a spectral reflectance of 40% or more. If it is divided into areas of less than 40%, the colored ink layer provided in the former area is discolored on the copy, while the colored ink layer provided in the latter area is copied without discoloration. Therefore, it is possible to more easily discriminate as a counterfeit product. Further, the white layer 13 may be formed in an arbitrary shape such as a fine pattern or a pattern such as a tint pattern or a figure corresponding to the visible information 14 formed on the base layer 15. If at least a part of the visible information 14 and a part of the white layer 13 are overlapped with each other, a discoloration effect is exhibited in the copy.

The colored ink layer 12 can be formed as the visible information 14 on the substrates 11a and 11b by a printing method such as a gravure printing method or an offset printing method using a gravure ink or an offset ink. At this time, add resin etc. to the known gravure ink or offset ink,
By adjusting the pigment ratio in the range of 0.01 to 1% in the case of gravure ink and in the range of 1 to 15% in the case of offset ink, the colored ink layer 12 having the pigment ratio in the range of 1 to 15% is obtained. Can be formed. Colored ink layer 1
The base material 11 has a pigment ratio of 2 in the range of 1 to 15%.
This is because the high reflectances of a and 11b are adjusted so as not to impair the density, and when the pigment ratio is higher than 15%, the color becomes dark and the amount of reflected light necessary for the color change effect cannot be obtained. When it becomes lower, the color of the colored ink layer 12 itself cannot be recognized by the color copying machine. Also visible information 1
If 4 is formed of the colored ink layers 12 of a plurality of colors, the plurality of colors will change to different color tones, and it will be possible to more prominently discriminate that the copy is a counterfeit.

For the ink forming the colored ink layer 12, the following pigments can be used according to each color. Examples of the yellow pigment include inorganic pigments such as chrome yellow, cadmium yellow, and titanium yellow, and quinophthalone-based, azo-based, isoindoline-based inorganic pigments such as C.I. I.
Pigment Yellow is an organic pigment, and red pigments include inorganic pigments such as cadmium red, red iron oxide, and molybdenum red, and generally C.I. such as azo, quinacridone, perylene, and lake red. I. Pigment Red, and examples of the purple pigment include inorganic pigments such as cobalt purple and manganese purple, and generally C.I. such as oxazine-based pigments, azo-based pigments, and anthraquinone-based pigments. I. Examples of organic pigments belonging to Pigment Violet and blue pigments include inorganic pigments such as ultramarine blue, dark blue (Prussian blue), and cobalt blue, and C.I. I. Pigment Blue, and as green pigments, inorganic pigments such as chrome green and cobalt green, and generally C.I. I. An organic pigment belonging to Pigment Green can be used. The ink for forming the colored ink layer 12 is used by adding these pigment vehicles and additives to form an ink. Further, it is also possible to prepare an ink having an arbitrary color tone by combining a plurality of these pigments.

Next, details of the second embodiment will be described. FIG. 3 shows the anti-counterfeit printed matter 1c of the second embodiment, which includes the base material 2
1, visible information 23 is formed by the colored ink layer 22 and a white layer 24 is formed so as to overlap at least a part of the visible information 23. The area where the white layer 24 is formed is white. The spectral reflectance is increased by 20% or more compared to before the layer 24 is formed. As a result, the surface of the anti-counterfeit printed matter 1c has a spectral reflectance of at least 40% or more.

The base material 21 is the base material 1 in the first embodiment.
The same material as 1 can be used. However, in this case, it is not necessary to limit the spectral reflectance of the surface of the base material.

As the colored ink layer 22, a known colored ink such as an offset ink or a gravure ink used in ordinary printing is used to form visible information 23 on the substrate 21 by an offset printing method, a gravure printing method or the like. It was done.

The white layer 24 is formed on the visible information 23 for the purpose of increasing the spectral reflectance of the surface of the printed matter having the visible information 23 on the substrate 21, and like the white layer in the first embodiment. It can be formed by a printing method such as a gravure printing method or an offset printing method using an ink composed of a white pigment. The white ink that forms the white layer 24 is a white pigment such as titanium white, zinc white, lithopone, antimony white, or zirconium oxide, or a mixture of these white pigments and extender pigments such as calcium carbonate, silica, or alumina. It can be used as an ink by adding a vehicle and additives. The pigment ratio at this time is 5 to 4
By adjusting the content in the range of 0%, it is possible to increase the spectral reflectance required for producing the discoloration effect in the copy by 20% or more. If the pigment ratio is less than 5%, the spectral reflectance cannot be increased to 20% or more, and the color change effect is not exhibited. On the other hand, when the pigment ratio exceeds 40%, the visible information 23 is hidden by the white layer 24.

The white layer 24 may be formed so as to at least partially overlap the visible information 23. The white layer 24 may cover the visible information 23 and may be formed on the entire surface of the base material 21 or may be formed on a part of the base material 21. Further, not a solid coating but an arbitrary pattern or figure such as a fine pattern, a tint block, and a pattern. May be formed as. When the white layer 24 is formed as an arbitrary pattern or figure, only the portion overlapping the visible information 23 composed of the colored ink layer 22 located below is discolored, and at first glance the copy is a counterfeit product. Can be determined.

Next, details of the third embodiment will be described. This anti-counterfeit printed material uses the anti-counterfeiting technology that uses the difference in the spectral reflectance and the reproducibility characteristics of the copying machine (coarse halftone dots are thick when copied, and fine halftone dots are not finely reproduced on the contrary). It is a combination of anti-counterfeiting technology and anti-counterfeiting printed matter having two printing areas with different density of halftone dots, and has a high anti-counterfeiting effect which can obtain a decoloring effect in addition to a discoloration effect.

That is, an anti-counterfeit printed matter having a first print area composed of coarse halftone dots and a second print area composed of fine halftone dots, which is composed of two areas and colored ink of the same color. It is a printed matter that is printed. When this printed matter is color-copied, the printed area portion composed of coarse halftone dots of the copied material changes color in combination with the spectral reflectance,
On the other hand, the print area portion composed of fine halftone dots is not reproduced by the copying machine and is erased. For this reason, it is possible to determine at first glance that it is a copy. The combinations are as follows. (1) In the case of a printed matter in which the area printed with fine halftone dots is the latent image area and the area printed with coarse halftone dots is the background area, when copying, the background area printed with coarse halftone dots is spectrally reflected. The color changes in relation to the rate, while the latent image portion printed with fine halftone dots is not reproduced and the color disappears, and a white warning text (including a warning mark, the same applies below) appears. (2) In the case of a printed matter in which the area printed with coarse halftone dots is the latent image portion and the area printed with fine halftone dots is the background portion, when copied, the latent image portion printed with coarse halftone dots is spectrally separated. It discolors due to the relationship with the reflectance and appears as a warning text, while the background part printed with fine dots cannot be reproduced and is erased.

Next, these anti-counterfeit printed matter will be described with reference to the drawings. FIG. 4 shows an example of the anti-counterfeit printed matter, FIG. 4 (a) shows the anti-counterfeit printed matter, and FIG. 4 (b) shows a copy obtained by copying the anti-counterfeit printed matter with a color copying machine.

In FIG. 4 (a), the anti-counterfeit printed matter 1d
Is a background area 3a which is two print areas having different density of halftone dots, that is, a background area 3a which is a first print area composed of coarse halftone dots,
The latent image portion 2 which is the second printing area composed of fine halftone dots
a, and both the latent image portion 2a and the background portion 3a are printed using color inks of the same system color. In this example, the latent image portion 2a is formed as a warning mark X mark.

The anti-counterfeit printed matter 1d has a spectral reflectance of 40% or more on the surface on which the background portion 3a and the latent image portion 2a are printed. In order to realize such a spectral reflectance, the spectral reflectance of the substrate, the spectral reflectance of the surface layer of the substrate, or the spectral reflectance of the surface layer of the printing surface is selected.

The counterfeit-proof printed matter 1d having the above-described structure
Since the latent image portion 2a of the latent image portion 2a is printed using the colored ink of the same system color as the background portion 3a, the latent image portion 2
It is difficult to recognize a, that is, the presence of the warning mark X in this example.

When the copy 4d is prepared by copying the anti-counterfeit printed matter 1d with a color copying machine, the background portion 6a of the copy 4d has a high spectral reflectance, so that the background portion 6a of the copy 4d is the same as the printed matter 1d. The background portion 3a discolors, while the latent image portion 5
Since a is composed of fine halftone dots, it is not reproduced by a copying machine and is erased, and is visualized as a white warning mark X mark.

In this case, if the printing ink used for printing the background portion 3a has the same color or hue as that of the printing ink used for printing the latent image portion 2a, the latent image of the second printing area is seen at first glance. It is possible to obtain the anti-counterfeit printed matter 1d in which it is difficult to confirm the existence of the image portion 2a.

FIG. 5 shows another example of the anti-counterfeit printed matter 1e. FIG. 5 (a) is a forgery-prevented printed matter, and FIG. 5 (b) is a copy obtained by copying the forgery-prevented printed matter with a color copying machine. Is.

In FIG. 5 (a), the anti-counterfeit printed matter 1e
Are two print areas having different density of halftone dots, that is, a latent image portion 2b which is a first print area composed of coarse halftone dots,
Background part 3 which is the second print area composed of fine halftone dots
b, and both the latent image portion 2b and the background portion 3b are printed using color inks of the same system color. In this example, the latent image portion 2b is formed as a warning mark X mark.

The anti-counterfeit printed matter 1e has a spectral reflectance of 40% or more on the surface on which the background portion 3b and the latent image portion 2b are printed. In order to realize such a spectral reflectance, the spectral reflectance of the substrate, the spectral reflectance of the surface layer of the substrate, or the spectral reflectance of the surface layer of the printing surface is selected.

The counterfeit-proof printed matter 1e configured as described above
Since the latent image portion 2b of the latent image portion 2b is printed using the color ink of the same system color as the background portion 3b, the latent image portion 2b can be seen at a glance.
b, that is, it is difficult to recognize the presence of the warning mark X in this example.

When the copy 4e is prepared by copying the anti-counterfeit printed matter 1e with a color copying machine, the background portion 6b of the copy 4e is composed of fine halftone dots as shown in FIG. 5B. It is not reproduced by a copying machine and is erased, while the latent image part 5
Since b is discolored with respect to the latent image portion 2b of the anti-counterfeit printed matter 1e, it is visualized as a discolored warning mark X mark.

In this case, if the printing ink used for printing the background portion 3b has the same color or a hue similar to that of the printing ink used for printing the latent image portion 2b, it is first seen at first glance in the same manner as in the previous example. It is possible to obtain the forgery-preventing printed matter 1e in which it is difficult to confirm the existence of the latent image portion 2b, which is the printing area.

Although FIGS. 4 and 5 show an example in which the entire surface of the anti-counterfeit printed matter is composed of the first printing area and the second printing area, at least the forgery of the first printing area and the second printing area. The same anti-counterfeiting effect can be obtained if it is on a part of the printed matter.Therefore, even if the other parts except the first printing area and the second printing area are white background, other printing is performed. May be.

If the first print area and the second print area are formed by a continuous print pattern such as a tint block, or if they are incorporated respectively as a part of the print pattern, the first print area and the second print area are further formed. It becomes difficult to distinguish between the two, and it is difficult to recognize the existence of the latent image portion with the naked eye.

In the anti-counterfeit printed matter shown in the examples of FIGS. 4 and 5, the coarse halftone dots constituting the first print area are from 50 to 100 lines, and the halftone dot area ratio is from 5 to 46%. 120 as fine halftone dots constituting the second print area
A combination that looks uniform to the naked eye can be selected from the range of ˜200 lines and halftone dot area ratio of 5 to 46%.

For example, in the example of the anti-counterfeit printed matter 1d shown in FIG. 4, the background portion 3a, which is the first printing area, has coarse halftone dots 6.
When it is configured with 5 lines and a halftone dot area ratio of 30%, if the latent image portion 2a that is the second print area is configured with 150 halftone dot dots and a halftone dot area ratio of 22 to 30%, the external appearance is Latent image part 2a
Becomes unnoticeable.

Incidentally, FIG. 4 (a), FIG. 5 (a) and FIG.
In the anti-counterfeit printed matter 1d, 1e shown in (a), the distinction between the latent image portions 2a, 2b and the background portions 3a, 3b is clearly shown in the drawing technique, but on the actual printed matter, both are distinguished by human eyesight. Can be printed indistinguishably.

Next, preferable experimental examples of the present invention will be shown below.

Experimental Example 1 Experimental example 1 is an experimental example of the first embodiment. Base material 11a has a width of 410 mm and a length of 80
White polyethylene terephthalate film "Lumirror E- with a thickness of 0 m and a thickness of 188 µm and a surface spectral reflectance of 90%.
22 ”(manufactured by Toray Industries, Inc.) is prepared and printed on one surface of the base material 11a by a gravure printing method using a gravure printing ink having the following composition and a pigment ratio of about 0.2%. The visible information 14 consisting of is formed, and the anti-counterfeit printed matter 1a is produced. The pigment ratio in the colored ink layer at this time was about 10%.

[0046]     Green ink "Microlith Green GK" Part 1               (Manufactured by Nippon Ciba Geigy)     Polyester resin "Byron" 5 parts               (Toyobo Co., Ltd.)     Methyl ethyl ketone 10 parts     Toluene 10 parts

On the other hand, as a comparative example, a base material similar to that of Experimental Example 1 was prepared, and the pigment ratio was about 4 in the composition of the above ink.
% Green ink "Microlith Green GK" was used for printing by a gravure printing method to form visible information consisting of a colored ink layer to produce a printed matter (not shown).
The pigment ratio in the colored ink layer at this time was about 40%. Both the experimental example 1 and the comparative example were printed materials having a green color tone.

(Results) The spectral reflectance spectral distributions of the printed matter of Experimental Example 1 and the printed matter of Comparative Example are as shown in FIG. The printed matter (A-1) of Experimental Example 1 is whitish due to the influence of the substrate having a high spectral reflectance, but has a peak near 500 nm as in Comparative Example (B-1), and has a visible appearance. Is a printed matter having a green color tone.

This is a color copying machine (CANON CLC
500, also known as Pixel Dio500, manufactured by Canon Inc., trade name). FIG. 8 shows the spectral reflectance spectral distribution of this copy. Comparing FIG. 7 and FIG. 8, in the comparative example, the spectral reflectance spectral distributions of the printed matter (FIG. 7 (B-1)) and the copied matter (FIG. 8 (B-2)) do not change so much. However, in Experimental Example 1, the spectral reflectance spectral distributions of the printed matter (FIG. 7 (A-1)) and the copied material (FIG. 8 (A-2)) vary greatly, and the spectral reflectance spectrum distribution indicates that the material is a duplicated material. Can be determined. Actually, the copy of the comparative example had a green color similar to that of the printed matter, and although it could not be judged visually that it was a copy,
Unlike the printed matter, the copied matter of Experimental Example 1 has a blue color, and it can be visually discerned that the copied matter is also a copied matter.

FIG. 9 shows the spectral reflectance spectral distribution of a copy when the density adjusting function of the color copying machine is used. Comparing FIG. 7 and FIG. 9, in the comparative example, the printed matter (FIG. 7 (B-
1)) and the copy (FIG. 9 (B-3)), the spectral reflectance spectral distributions do not change so much. However,
In Experimental Example 1, printed matter (FIG. 7A-1) and copied matter (FIG. 9).
The spectral reflectance spectral distribution of (A-3)) has a large change, and it can be determined from the spectral reflectance spectral distribution that it is a copy. Actually, the copy of the comparative example exhibited a green color similar to that of the printed matter, and it was not possible to determine that the copy was visually visible, but the copy of Experimental Example 1 was different from the printed matter.
It has a greenish blue color and can be discerned visually as a copy.

In addition, as a copying machine, "KONICA Color 7" (manufactured by Konica), "FUJI-XEROX A"
Color 635 "(manufactured by Fuji Xerox Co., Ltd.)," RIC
OHARTAGE-8000 "(manufactured by Ricoh Company)," MI
Experiments were also performed on "NOLTA LIMOS 80" (manufactured by Minolta), but the same tendency was shown.

In addition to green, the following gravure printing ink was used to print on the same base material 11a as in Experimental Example 1 by the gravure printing method to form the visible information 14 consisting of the colored ink layer 12. The same result was obtained when the anti-counterfeit printed matter 1a was produced. Furthermore, the same was true for all color tones obtained by mixing these inks.

(Experimental Example 2)     Red-based ink "Microres red BR-K" 1 part                     (Manufactured by Nippon Ciba Geigy)     Polyester resin "Byron" 5 parts                     (Toyobo Co., Ltd.)     Methyl ethyl ketone 10 parts     Toluene 10 parts   (The pigment ratio of the ink is about 0.2% and the pigment ratio of the colored ink layer is about 10%)

(Experimental Example 3)     Red ink "Microres Red 1906K" 1 part                     (Manufactured by Nippon Ciba Geigy)     Polyester resin "Byron" 5 parts                     (Toyobo Co., Ltd.)     Methyl ethyl ketone 10 parts     Toluene 10 parts   (The pigment ratio of the ink is about 0.2% and the pigment ratio of the colored ink layer is about 10%)

(Experimental Example 4)     Blue ink "Microlith Blue A3K" 1 part                     (Manufactured by Nippon Ciba Geigy)     Polyester resin "Byron" 5 parts                     (Toyobo Co., Ltd.)     Methyl ethyl ketone 10 parts     Toluene 10 parts   (The pigment ratio of the ink is about 0.2% and the pigment ratio of the colored ink layer is about 10%)

(Experimental Example 5)     Yellow ink "Microlith Yellow BR" 1 part                     (Manufactured by Nippon Ciba Geigy)     Polyester resin "Byron" 5 parts                     (Toyobo Co., Ltd.)     Methyl ethyl ketone 10 parts     Toluene 10 parts   (The pigment ratio of the ink is about 0.2% and the pigment ratio of the colored ink layer is about 10%)

(Experimental Example 6) Next, as Experimental Example 6, a substrate 11a similar to that of Experimental Example 1 was prepared, and an offset printing ink having the following composition and a pigment ratio of 5% was used on one surface of the substrate 11a. Colored ink layer 1 printed by offset printing
The visible information 14 consisting of 2 was formed, and the anti-counterfeit printed matter 1 was produced. The pigment ratio in the colored ink layer at this time was about 5%.

[0058]     "UV Best Cure STP Green W" 25 copies                     (Made by T & K Toka)     "UV Best Cure STP Medium W" 75 copies                     (Made by T & K Toka)

On the other hand, as a comparative example, a base material similar to that of Experimental Example 1 was prepared, and a green ink "UV Best Cure STP Green W" having a pigment ratio of about 20% was used for offsetting. Printing was performed by a printing method to form visible information composed of a colored ink layer, and a printed matter was produced (not shown). The pigment ratio in the colored ink layer at this time was about 20%. When the experimental example and the comparative example were color-copied in the same manner as in the experimental example 1, the same effect as in the experimental example 1 was confirmed for the copy.

(Experimental Example 7) OCR paper "Shiroku (90)" having a surface spectral reflectance of 90% or more as the base material 11a.
(Manufactured by Mitsubishi Paper Mills Co., Ltd.) is prepared and printed on one surface of the substrate 11a by an offset printing method using an offset printing ink having a pigment composition of the following composition of about 11%, and a visible information consisting of a colored ink layer 12 is formed. Anti-counterfeit printed matter 1 forming 14
Was produced. The pigment ratio in the colored ink layer 12 at this time was about 11%.

[0061]     55 parts of green ink "BF405 Green"                     (Made by T & K Toka)     "BF medium" (made by T & K Toka) 45 parts

When this anti-counterfeit printed matter was color-copied, the same discoloration effect was confirmed as in Experimental Example 1. Similar results were obtained with inks other than green.

Experimental Example 8 Experimental Example 8 is an experimental example of the second embodiment. As the base material 21, the spectral reflectance of the surface is 90.
% Polyethylene terephthalate film "Lumirror E
-22 "(manufactured by Toray Industries, Inc.) is prepared, and printing is performed on one surface of the base material 21 by the gravure printing method using the gravure printing ink having the following composition.
Formed 3. At this time, the spectral reflectance of the surface of the printed matter was about 40%.

[0064]     Green ink "Microlith Green GK" Part 1                     (Manufactured by Nippon Ciba Geigy)

Next, a white layer 24 was formed on the visible information 23 by a gravure printing method using a white ink having the following composition to prepare a forgery-proof printed matter 2. At this time, the spectral reflectance of the surface of the region having the white layer 24 was about 70%.

[0066]     "Microlith White RK" 10 copies               (Manufactured by Nippon Ciba Geigy)     Methyl ethyl ketone 45 parts     45 parts of toluene

When this anti-counterfeit printed matter was color-copied, the same discoloration effect was confirmed as in Experimental Example 1. Similar results were obtained with inks other than green.

(Experimental Example 9) Experimental Example 9 is an experimental example of the third embodiment. Width 410mm, length 800m as base material,
White polyethylene terephthalate film "Lumirror E-22" with a thickness of 188 μm and a surface spectral reflectance of 90%
(Manufactured by Toray Industries, Inc.) was prepared, and printing was performed on one surface of the base material by the offset printing method using an offset printing ink having the following composition and a pigment ratio of about 5%, as shown in FIG. 4 (a). The first printing area is 65 lines, the background portion 3a is composed of coarse halftone dots having a halftone dot area ratio of 30%, and the second printing area is 150.
Line, latent image portion 2a composed of fine halftone dots having a halftone dot area ratio of 28%
Visual information consisting of a colored ink layer composed of (warning mark X mark) was formed, and an anti-counterfeit printed matter 1d showing green as a whole was produced. The pigment ratio in the colored ink layer at this time was about 5%.

[0069]     UV Best Cure STP Green W 25 parts                     (Made by T & K Toka)     UV Best Cure STP Medium W 75 Parts                     (Made by T & K Toka)

For the printed matter 1d, the number of lines and halftone dot area ratio, which are difficult to distinguish the difference in halftone dots in appearance, were selected. The printed material 1d was green and showed blue 0.20 and yellow 0.10 as measured by a Macbeth densitometer. The above-mentioned printed matter 1d is CANON CL
C500, also known as Pixel Dio 500 (trade name
Color copy was made with Canon Inc.), as shown in Fig. 4 (b).
As shown in FIG. 3, the background portion 6a having coarse halftone dots was reproduced, the latent image portion 5a having fine halftone dots was not reproduced, and a copy 4d was obtained in which white spots were generated and an X mark as a warning mark was exposed. Further, the background portion 3a of the anti-counterfeit printed matter 1d is green, whereas the background portion 6a of the copy 4d exhibits a blue discoloration effect, and it is apparent that the copy is a copy. Also,
Even if the density adjustment function was adjusted, the hue of the copy was greenish blue, and the color change effect was sufficiently recognizable. Also, the same effect was obtained by copying with a color copying machine made by another company.

In addition, since the background portion 6a is discolored by color copying, for example, when the warning mark X is hard to be seen by printing on the latent image portion 2a of the anti-counterfeit printed matter 1d as shown in FIG. 6 (a). However, as shown in FIG. 6B, it can be easily understood that the background portion 6a of the copy 4d is changed from green to blue to be a copy.

(Experimental Example 10) Experimental Example 10 is an experimental example of another third embodiment. As the base material, OCR paper "Shiroku (90)" (manufactured by Mitsubishi Paper Mills) having a surface spectral reflectance of 90% or more was prepared, and the pigment ratio of the following composition was about 1 on one surface of the base material.
Printing is performed by the offset printing method using 1% of the offset printing ink, and as shown in FIG. 5A, the second printing area is 150 lines, the background portion 3b of the fine halftone dot area ratio 30%. And 65 lines as the first printing area, the visible information is formed by the colored ink layer composed of the latent image portion 2b (warning mark X mark) of the rough halftone dot having the halftone dot area ratio of 30%, and the entire green is formed. An anti-counterfeit printed matter 1e exhibiting the above was produced. The pigment ratio in the colored ink layer at this time was about 11%.

[0073]     55 parts of green ink "BF405 Green"                     (Made by T & K Toka)     "BF medium" (made by T & K Toka) 45 parts

The printed matter 1e was CAN-scanned as in the experimental example.
ON CLC500, also known as Pixel Dio 500
When a color copy is made with (product name: Canon Inc.), as shown in FIG. 5 (b), the background portion 6b of fine halftone dots cannot be reproduced and is erased white, and only the latent image portion 5b of coarse halftone dots is shown. As a result, a copy 4e was obtained, which emerged as a warning mark X, which changed from green to blue.

Experimental Example 11 Experimental example 11 is an experimental example of another third embodiment. As a base material, a polyethylene terephthalate film “Lumirror E-22” (manufactured by Toray Industries, Inc.) having a spectral reflectance of 90% on the surface is prepared, and a green offset printing ink, UV Best Cure STP is provided on one side of the base material.
Printing is performed by an offset printing method using Green W (T & K Toka Co., Ltd.), and as shown in FIG. 4A, the first printing area is 65 lines, and the halftone dot area ratio is 30%. The visible information is formed by the colored ink layer composed of the background portion 3a, the second print area of 150 lines, and the latent image portion 2a (warning mark X mark) composed of fine halftone dots having a halftone dot area ratio of 28%. . At this time, the spectral reflectance of the surface of the printed matter was about 40%.

Next, a white layer is formed on the visible information by a gravure printing method using a white ink having the following composition,
An anti-counterfeit printed matter 1f showing a green color was produced. At this time, the spectral reflectance of the surface of the area having the white layer is about 70.
%Met.

[0077]     "Microlith White RK" 10 copies                     (Manufactured by Nippon Ciba Geigy)     Methyl ethyl ketone 45 parts     45 parts of toluene

When this anti-counterfeit printed matter is color-copied, as shown in FIG. 4 (b), the background portion 6a of the coarse halftone dots is reproduced, the latent image portion 5a of the fine halftone dots is not reproduced, and a white spot is generated. A copy 4f having an X mark as a mark was obtained. Further, the background portion 3a of the printed matter 1f is green, whereas the background portion 6a of the copied matter 4f exhibits a blue discoloring effect, and it is apparent that the printed matter 1f is a duplicated matter.

Experimental Example 12 Experimental example 12 is an experimental example of another third embodiment. A polyethylene terephthalate film “Lumirror E-22” (manufactured by Toray Industries, Inc.) having a spectral reflectance of 90% on the surface was prepared as a substrate, and the green offset printing ink used in Experimental Example 11 was used on one surface of the substrate. Printing is performed by the offset printing method, and as shown in FIG. 5A, the second printing area is 150 lines and the halftone dot area ratio is 30.
%, The background portion 3b of the halftone dots and the first print area 6
Visible information was formed of a colored ink layer composed of 5 lines and a latent image portion 2b (warning mark X mark) of a halftone dot having a halftone dot area ratio of 30%. At this time, the spectral reflectance of the surface of the printed matter was about 40%.

Then, a white layer was formed on the visible information by a gravure printing method using a white ink having the same composition as in Experimental Example 11, and 1 g of a forgery-proof printed matter showing a green color was produced. At this time, the spectral reflectance of the surface of the region having the white layer was about 70%. When this anti-counterfeit printed matter was color-copied, the background portion 6b of fine halftone dots was not reproduced and became white as shown in FIG. As a result, a copy 4g was obtained, which emerged as a warning mark X, in which only 5b turned from green to blue.

[0081]

As described above, in the present invention, the reflectance of a printed matter is increased by using a substrate having a high spectral reflectance or forming a white layer having a high spectral reflectance on a colored ink layer. , Since the reproducibility of the copy is reduced by inhibiting the exposure of a specific component of the reflected light, a special coloring material that utilizes the difference between the human visual acuity and the sensitivity of the photoconductor is used as in the conventional technology. Not because
Forgery due to copying can be prevented even when the color material is selected from a wide range.

In addition to the anti-counterfeiting technique that utilizes the difference in reproducibility of the copy due to the difference in the spectral reflectance, the printed image, which is visible information, is formed by the density of specific halftone dots and the resolution of the copying machine. When the anti-counterfeiting technology utilizing is combined, it is possible to more easily determine that the image is a forgery due to local discoloration and decoloration of the image of the copy.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional explanatory view of a first anti-counterfeit printed matter.

FIG. 2 is an enlarged cross-sectional explanatory view of a modified example of the first anti-counterfeit printed matter.

FIG. 3 is an enlarged cross-sectional explanatory view of a second anti-counterfeit printed matter.

FIG. 4 is an explanatory plan view of an anti-counterfeit printed matter and a copy.

FIG. 5 is an explanatory plan view of another forgery-proof printed matter and a copy.

FIG. 6 is an explanatory plan view of another forgery-proof printed matter and a copy.

FIG. 7 is a graph showing a spectral reflectance spectrum distribution of a printed matter.

FIG. 8 is a graph showing a spectral reflectance spectrum distribution of a copy.

FIG. 9 is a graph showing a spectral reflectance spectrum distribution of a copy that has been subjected to density correction.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e, 1f, 1g Anti-counterfeit prints 2a, 2b Latent image parts 3a, 3b of anti-counterfeit prints Background parts 4d, 4e, 4f, 4g of anti-counterfeit prints 5a, 5b Copies Latent image parts 6a, 6b Background parts 11a, 11b, 21 of copy material 12, 12 Colored ink layer 13, 24 White layer 14, 23 Visible information 15 Base layer

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-158410 (JP, A) JP-A-59-114566 (JP, A) JP-A-54-127709 (JP, A) Actual development Sho-61- 204766 (JP, U) Actual development Sho 64-46277 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B42D 5/00-15/10 B41M 3/14 G03G 21/00

Claims (8)

(57) [Claims] 1. A spectral reflection of a portion of a surface of a base material of a printed matter, which overlaps with at least a portion of a region where visible information is formed by a colored ink containing a pigment in a range of 1 to 15% by weight. The ratio is set to 40% or more, and the yellow component, which is a color separation component obtained from the colored ink, is influenced so that the color tone of the colored ink forming the visible information is changed and copied. Anti-counterfeit printed matter characterized by the following. 2. The forgery-preventing printed material according to claim 1, wherein the base material is a white base material or a base material having a white layer on the surface. 3. The surface is divided into a region having a spectral reflectance of 40% or more, which is a reflected light amount necessary for a color changing effect, and a region having a spectral reflectance of less than 40%, which does not exhibit a color changing effect. The anti-counterfeit printed material according to claim 1. 4. The forgery-preventing printed matter according to claim 1, wherein the visible information is formed by a plurality of colored inks. 5. A printed matter on which visible information is formed by colored ink, wherein a white layer is formed so as to overlap with at least a part of the visible information, and a region where the white layer is formed is white. The anti-counterfeit printed matter according to claim 1, wherein the spectral reflectance of the surface is increased by 20% or more as compared with that before the layer is formed. 6. The print area on which the visible information is formed includes a first print area and a second print area, and the first print area is composed of coarse halftone dots, and the second print area. 2. The dot is composed of fine halftone dots.
The anti-counterfeit printed matter according to any one of items 1 to 5. 7. The forgery-preventing printed matter according to claim 5, wherein the first printing area and the second printing area are printed with colored inks of a similar color. 8. The forgery-preventing printed matter according to claim 5, wherein the first printing area and the second printing area are printed with colored inks of different system colors.