JP3529076B2 - Copy-prevention printed matter and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color copying machine which is required to prevent forgery and falsification of banknotes, passports, securities, identification cards, cards, pass tickets, valuable printed materials, important documents and the like. The present invention relates to a copy-preventing printed material that can be visually discriminated as a copied material when copied by utilizing the above, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a printed matter for preventing forgery due to copying using a color copying machine, for example, one of a background and a latent image of the same color is a line, the other is a halftone dot, or one is a fine halftone dot. The dots and the other are composed of coarse halftone dots, and the decorative pattern is overprinted on the upper surface of the latent image with a light-colored transparent ink that is not reproduced by copying. Since the latent image is hidden by the decorative pattern, it is not visible to the naked eye, but when it is applied to a copying machine, the decorative pattern printed with light-colored ink is not copied, and due to the reproduction difference between the two highlighted halftone dots. JP-B-64-5835 (namely "printed matter suitable for copy prevention") in which a latent image is clearly recognized is disclosed. This is a fine structure that replaces the conventionally used combination of large and small halftone dots. The combination of halftone dots and lines, which are the children, is overprinted with a light-colored transparent ink that does not allow reproduction of decorative patterns such as tint blocks and colored patterns. It is one.

Further, a difficult-to-copy image displaying a content that is not to be copied, which is composed of characters or pictures, and a camouflage pattern printed with an ink of a different color from the difficult-to-copy image so as to overlap the difficult-to-copy image. Image, and the difficult-to-copy image has good recognizability with the naked eye, but is printed with an ink having a reflection spectral characteristic that is difficult to be recognized by the photoconductor of a copying machine. Although difficult to recognize, the photoconductor of the copying machine has a reflection spectral characteristic that is easy to recognize, and the relationship between the linear characters of the characters or patterns of the difficult-to-copy image and the linear characters or characters of the camouflage pattern image. , And the pitch between the tint blocks makes it difficult to read the above-mentioned difficult-to-copy image at the time of copying, but there is Japanese Utility Model Laid-Open No. 61-204766 (namely, "image forming body with anti-copy measures"). And the composition sentence of the camouflage pattern image Or come is troublesome that it is necessary to adjust the pitch between the relationship and the background pattern with the pattern of the linear.

Further, the surface has a spectral reflectance of at least 4
Visible information is formed on the substrate by a colored ink layer with 0% or more of the substrate, and a white layer is formed by superimposing at least a part of the visible information to increase the spectral reflectance, thereby making a copy. The amount of light reflected by the light source of the copying machine is increased, and it is recognized by the photoconductor of the color copying machine under the influence of certain color separation components of the three primary color components obtained from the colored ink layer formed on the substrate. The effect that the color reproduction is not faithfully performed by making it difficult, and the difference in halftone dot reproducibility that utilizes the reproducibility characteristics of the color copying machine by forming the printed image that is the visible information by the density of halftone dots. Japanese Patent Application Laid-Open No. 7-68981 (named "counterfeit-proof printed matter"), which combines the effects of the above, uses the color change of the copy by increasing the reflectance by using a white layer or the like. Doing Therefore, when looking at the spectral reflectance curve in the visible region, the color change of the copy is such that the position of the peak of the spectral reflectance showing the color properties is in the same wavelength range as the original printed matter, and the density of the halftone dots known in the past is By combining them, the anti-counterfeiting effect is improved.

In any case, at present, the color copiers have been digitized, and the resolution of the color copiers has been improved and the performance of the color copiers has been remarkably improved by providing a color correction function. For anti-counterfeit printed matter,
Since the check function against copying is deteriorated and sufficient forgery prevention cannot be performed, further emergence of a forgery prevention measure by copying using a color copier has been desired.

[0006]

DISCLOSURE OF THE INVENTION As described in detail above,
A conventional printed matter that has been subjected to anti-counterfeiting measures has restrictions such as the size of halftone dots, line drawings, lines, etc., and the pitch of constituent patterns, etc. due to camouflage compared to copying using current color copiers. Further, it is difficult to surely prevent forgery due to copying in order to improve the resolution of the copying machine.
Further, in the technology utilizing the difference in the reflectance of the colored ink layer, there has been a demand for a copy prevention technology that does not rely on the formation of the density of halftone dots and has a more difficult color reproducibility.

The present invention eliminates the inconveniences of the conventional anti-counterfeit printed matter by a copying machine, and even if color copying is performed by adjusting the color tone over a wide range with the improvement of the performance of the copying machine, it is possible to perform fine copying. Due to the optical interaction of the printing layer with the transparent printing ink consisting of various colored pigment particles and the first colored printing layer, the special optics for the copying machine which cannot be obtained by the simple one-layer structure printing. Effect is realized by forming a two-layer structure print, and the difference in hue between the original print and the copy is made noticeable, so that the copying machine is not restricted by the shape and pitch of any pattern. It is intended to provide a copy-preventing printed matter and a method for producing the same, which can surely prevent forgery due to the copying.

[0008]

In order to achieve the above object, the present invention provides
Then, on a printing substrate such as paper or film, a first printing layer is formed by printing an arbitrary pattern with a yellow printing ink so that it completely overlaps with the first printing layer. The same pattern as the pattern formed on the first printed layer is formed with a blue-based printing ink having transparency, which is composed of an inorganic pigment, to form a second printed layer, and the first and second printed layers are overlaid. A copy-preventing printed matter and a method for producing the same, in which a blank area other than the formed pattern is printed with a printing ink having the same color as the mixed color of the first printing layer and the second printing layer.

The pattern composed of the arbitrary lines is
A copy-preventing printed matter that is characters, symbols, facial images, and other meaningful information, and a method of creating the same.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In a copy-preventive printed matter of the present invention, a first printing layer on which meaningful information is provided by a normal yellow ink appears so that a first printing layer appears on the first printing layer. A second printing layer on which an arbitrary pattern is printed is formed on the entire surface with a blue printing ink having transparency, which is composed of an inorganic pigment having a complementary color relationship with the first printing layer, or the pattern of the second printing layer is formed as described above. The same pattern as the pattern of the first printing layer, the pattern is completely overprinted on the first printing layer, the margin portion other than the pattern, the first printing layer and the second printing layer The two printing layers are formed of printing ink of a color that is the same as the displayed color to prevent color copying. That is, a part of the illumination light emitted from the light emitting section of the copying machine passes through the transparent blue printing ink layer which is the second printing layer made of an inorganic pigment to form the first printing layer. By reflecting on the yellow ink or the ink layer having a hue similar to that of the yellow ink, information of the hidden first printing layer, which cannot be visually recognized, is copied and revealed.

FIG. 1 shows the spectral reflectance curves of the pattern area of the two-layer structure of the original print and the pattern area of the copy obtained by copying the original print with a commercially available color copying machine. In the 700 nm region, the copy shows a higher spectral reflectance than the original printed matter, and the spectral reflectance curve in the entire visible light region shows a yellowish display pattern. On the other hand, FIG. 2 shows a margin area formed by a normal offset printing ink having the same color as the pattern area of the two-layer structure of the original printed matter, and the margin area obtained by copying the printed matter with a commercially available color copying machine. The spectral reflectance curve of
The spectral reflectance of the copy in the region of 0 nm exhibits a greenish display pattern that is almost the same color as the original, and as compared with FIG. 1, it is clear that the double-layered printing method is effective in preventing copying. It is confirmed.

The colors of the inks of the first printing layer and the second printing layer used in the present invention can be arbitrarily set according to need, but as a particularly effective combination of the anti-copy inks of the present invention, The ink of the first printing layer is a normal yellow ink, and the ink of the second printing layer is a blue ink composed of fine particle pigments having a complementary color relationship with the first printing layer. Overprinting.

As the arbitrary image lines used in the present invention, halftone dots, lines, solid printing, and other image lines are applied.

[0015]

The present invention will be described in detail below with reference to the drawings of the embodiments.

[Embodiment 1] FIGS. 3 and 4 are views showing an embodiment of the anti-counterfeit printed matter according to the present invention. Information to be applied, for example, a positive or negative pattern (2) which is a latent image displayed as "COPY", is printed on the base material (1) with a normal yellow offset process ink to form a first print layer. To do. Next, an arbitrary printed pattern (3) was printed on the upper surface of the latent image with a transparent blue-based printing ink composed of an inorganic pigment having an average particle size of 0.01 to 0.02 μm in a blending ratio shown in Table 1. Is printed as a second printing layer. However,
In this embodiment, the composition of the printing ink or varnish is a UV irradiation type dry ink or varnish, but if it is a printing varnish, it is an oxidation polymerization type, a solvent volatilization type,
Any of an ultraviolet curing type, an electron beam curing type, an infrared curing type and the like may be used, and the kind of drying property is not limited.

[0017]   Table 1     A transparent blue color composed of an inorganic pigment having an average particle size of 0.01 to 0.02 μm.     Mixing ratio of printing ink       Ultra fine particle composite oxide pigment dipyroxide         TM Color # 3410 (manufactured by Dainichiseika Co., Ltd.) 30 parts by weight       Acrylate monomer and oligomer resin 70 parts by weight       UV polymerization initiator 5 parts by weight (outer percent )       Polymerization inhibitor (methyl hydroquinone) 0.1 parts by weight )

The printed matter of the present invention composed of the first printing layer and the second printing layer is visually transparent which is composed of an inorganic pigment having an average particle diameter of 0.01 to 0.02 μm which forms an upper layer. The color formed by the blue printing ink having the properties and the yellow ink forming the lower layer, or the green color corresponding to the ink film thickness of these two layers, and the latent image (2) cannot be visually recognized. Commercially available color copier (Canon:
When a copy (4) is made by applying it to CLC800, CLC470), the blue-based printing ink forming the upper layer has excellent light transmittance even if the density is adjusted by the color adjusting function of the color copying machine. Information that has been imparted by the ordinary yellow ink forming the lower layer, for example, the letters "COPY" of the latent image or the background portion other than the letters "COPY" is reproduced as a noticeable yellowish image. As a result, the authenticity of the printed matter can be easily visually identified. This ensures that the image composition of the first print layer is not restricted by the size of halftone dots, line drawings, lines, etc., the pitch of the composition pattern, etc., and by utilizing the change in color, the copying machine can be reliably executed. Will prevent counterfeiting.

FIG. 5 is a cross-sectional view showing the structure of the printed matter that constitutes FIGS. 3 and 4.

Example 2 FIGS. 6 and 7 show a substrate (1).
Similar to the first embodiment, the information to be added, for example, a positive or negative pattern (2) of a latent image displaying a pattern composed of characters, halftone dots, or line drawings, using a normal offset process yellow ink. It is printed to form a first print layer. Next, on the upper surface of the latent image, a positive or negative pattern having the same pattern as the information given to the first printing layer is formed, and is composed of an inorganic pigment having an average particle size of 0.01 to 0.02 μm shown in Table 1 above. A blue printing ink having transparency is overprinted so as to completely cover and hide the pattern (2) of the yellow ink of the first printing layer. Further, the blank area (5) other than the positive or negative pattern of the overprinted characters has an average particle size of 0.01 to 0.02 with the yellow printing ink.
Printing is performed with a printing ink that has the same color as the mixed color of the blue-based printing ink having transparency and made of an inorganic pigment of μm. According to this method, the pattern of the first print layer is completely hidden by sight, which is particularly effective for forming a latent image of information that requires confidentiality.

A commercially available color copying machine (Canon: CLC800, CLC47;
When the copy (4) is created by applying 0), the information added to the image structure of the first printing layer, for example, the pattern composed of characters or halftone dots or line drawings, is displayed even by adjusting the density of the color copying machine. The positive or negative pattern of the formed latent image has a yellowish tint, and the difference from the color of the printed layer in the copied blank area becomes noticeable, which makes it easy to visually confirm the authenticity of the printed matter. Further, it is possible to determine whether or not the certificate is the certificate to which the proper identification information is added, by recognizing the pattern or the like that appears by copying. This is to prevent the forgery by the copying machine without being restricted by the size of halftone dots, line drawings, lines, etc. forming the pattern and the pitch of the constituent pattern, and by using only the color change. by.

FIG. 8 is a cross-sectional view showing the structure of the printed matter constituting FIGS. 6 and 7.

The embodiments of the copy-preventing printed matter of the present invention have been described above. However, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the present invention. is there.

[0024]

As described above, even if an attempt is made to forge a printed matter obtained by the present invention with a color copying machine, the hidden meaningful information and the like will be copied and revealed easily. It can be visually discriminated that it is a copy. Further, the technology of the present invention is not restricted by the shape of the pattern, the width of the line, the number of dots of the halftone dot, the pitch, etc. due to the optical effect of the two printing layers, and the information is in a normal state. When the image is hidden and applied to a color copying machine, the hidden information is disclosed for the first time, and it is determined that it is a copy. In addition, a complete copy prevention effect can be obtained by using any of the commercially available copy machines having improved resolution.

[Brief description of drawings]

FIG. 1 shows a two-layer structure pattern of an original print and a spectral reflectance curve of a copy.

FIG. 2 shows a spectral reflectance curve of a printed portion of an ink having the same color as the two-layer structure of the original printed matter and a copy.

FIG. 3 is an explanatory diagram of a case where the latent image pattern of Example 1 is positive.

FIG. 4 shows an explanatory diagram of a negative latent image pattern of Example 1.

FIG. 5 shows a cross-sectional view of the printed matter of Example 1.

FIG. 6 is an explanatory diagram of a latent image pattern of Example 2 when it is positive.

FIG. 7 shows an explanatory diagram of a case where the latent image pattern of Example 2 is negative.

FIG. 8 shows a sectional view of a printed matter of Example 2.

[Explanation of symbols]

1 Printing base material 2 Positive and negative patterns that become latent images 3 any print pattern 4 Copy 5 margin area

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-7-266770 (JP, A) JP-A-7-40645 (JP, A) JP-A-60-79991 (JP, A) JP-A-7- 137492 (JP, A) JP-A-8-282084 (JP, A) Actually open 61-204766 (JP, U) Actually open 7-5749 (JP, U) Registered utility model 3044152 (JP, U) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) B41M 3/14 B42D 15/10 G03G 21/04

Claims (4)

(57) [Claims] 1. A yellow printing ink on a printing substrate,
A first printing layer is formed by printing an arbitrary pattern, and the same pattern as the pattern formed on the first printing layer is composed of an inorganic pigment so as to completely overlap the first printing layer. A second printing layer is formed with a blue-based printing ink having transparency, and a blank area other than the pattern formed by stacking the first and second printing layers, the first printing layer and the second printing layer. A copy-preventing printed material, which is printed with a printing ink having the same color as the mixed color of the printing layer. 2. A yellow printing ink on a printing substrate,
A first printing layer is formed by printing an arbitrary pattern, and the same pattern as the pattern formed on the first printing layer is composed of an inorganic pigment so as to completely overlap the first printing layer. A second printing layer is formed with a blue-based printing ink having transparency, and a blank area other than the pattern formed by stacking the first and second printing layers, the first printing layer and the second printing layer. A method for producing a copy-preventing printed matter, which comprises printing with a printing ink having the same color as the mixed color of the printing layer. 3. A copy-preventing printed material, wherein the pattern according to claim 1 is characters, symbols, facial images, or other meaningful information. 4. A method for producing a copy-proof printed matter, wherein the pattern according to claim 2 is characters, symbols, facial images, and other meaningful information.