JP4967569B2 - Anti-counterfeit media and anti-counterfeit stickers - Google Patents

Description

  The present invention is a medium exhibiting a color shift in which the reflected color is changed and observed by changing the viewing angle, in particular, facilitating visual authenticity determination, and forgery, alteration, alteration, etc. The present invention relates to a forgery prevention medium and a forgery prevention sticker.

  Conventionally, as a means for preventing counterfeiting, it is difficult to imitate the article itself, or a thing that is difficult to imitate is attached to the article as a proof of authenticity, thereby making it possible to There are several ways to make it distinct. As a typical example of the latter, light diffraction and interference are used, and an inherent color shift (color change of reflected light) is generated according to the viewing angle so that the visible color differs depending on the observation position. Media. It is possible to easily determine whether or not such a medium is genuine by verifying the color shift state or the presence or absence thereof.

  For example, Patent Document 1 describes an optically variable pigment that exhibits a color shift depending on the viewing angle and its anti-counterfeit printed matter, as a color shift (color change of reflected light) depending on the viewing angle. Patent Document 2 describes a pearl pigment having a high iris color effect. Furthermore, Patent Document 3 describes a forgery prevention medium obtained by embossing a multilayer thin film layer that is formed by laminating a plurality of thin film layers and exhibits a color shift depending on the viewing angle.

  Media that exhibit these color shifts can determine whether the color change due to the difference in viewing angle is true or false with respect to counterfeit products. Since it is impossible to reproduce even the optical characteristics, it is difficult to forge or alter using copy.

As one of the usage forms of the medium exhibiting color shift as described above, there is an example of a sticker that exhibits color shift. For example, stickers that can simply be attached to other items, or considering additional security, if you try to peel off the attached items, the vulnerable parts will be destroyed, making it difficult to regenerate It is a brittle type sticker. Especially for brittle type stickers, not only the authenticity is determined by verifying the presence or absence of color shift and the degree of color change, but part or the whole is destroyed when trying to peel off after being applied. In addition to counterfeiting itself, it is possible to determine at a glance that tampering has been applied to the pasted article.
Japanese translation of PCT publication No. 2002-523606 JP-A-10-279828 Japanese Patent Laid-Open No. 11-2224050

  However, in the medium using these optical interferences, there is a problem that it is difficult to determine authenticity because it tends to be regarded as genuine if a slight color change occurs. In addition, the medium using these optical interferences has a problem in that an embossed plate is obtained from an embossed portion on the surface, and a forgery is illegally created using the embossed plate.

The present invention has been made paying attention to the above-described problems, and since the color shift effect layer containing a light interference pigment exhibiting an angle-dependent color shift is provided on the embossed portion, the embossed portion is Since it is not located on the outermost surface, an anti-counterfeit medium that prevents the creation of an embossed plate reflecting the uneven shape of the embossed part by taking the shape of the surface part, and further preventing the creation of counterfeit products, and The purpose is to provide anti-counterfeit stickers.

  Furthermore, since the anti-counterfeit medium and the anti-counterfeit sticker of the present invention have a structure in which a color shift effect layer including an optical interference pigment exhibiting an angle-dependent color shift is provided on the embossed portion as described above, the embossed portion By setting various embossing patterns and arrangement states, the color shift and brightness will be complicated, and the color shift variation will become more complicated, and the authenticity judgment using these will be made more reliable Can do.

In order to solve the above-described problems, the invention according to claim 1 is provided with an embossed portion in which an embossed pattern is formed on at least a part of one surface of the base material, and on the embossed portion. Is a forgery-preventing medium characterized in that a color shift effect layer containing a light interference pigment exhibiting an angle-dependent color shift is provided.

The invention according to claim 2 is the anti-counterfeit medium according to claim 1 , wherein the surface of the light interference pigment is coated with a metal oxide .

Furthermore, the invention according to claim 3, wherein the embossed pattern, the cross-sectional shape has no serrated, and cross-sectional shape of the portion corresponding to the respective tooth is a right triangle, yet its The anti-counterfeit medium according to claim 1 or 2, wherein corners that are not right angles are continuously arranged so as to be located at the tip.

Furthermore, the invention described in claim 4 is characterized in that , in addition to the embossed portion, a non-embossed portion not formed with an embossed pattern is provided, and both are set to different hues or brightness. The forgery prevention medium according to any one of claims 1 to 3 .

Furthermore, in the invention described in claim 5, the emboss pattern has a sawtooth shape in cross section, and a cross section shape of a portion corresponding to each tooth is a right triangle, and A corner portion that is not a right angle is continuously arranged so as to be positioned at a tip portion, a plurality of the embossed portions are provided, and the directions of the sawtooth emboss patterns are different from each other. The anti-counterfeit medium according to any one of claims 1 to 4, wherein the medium is an anti-counterfeit medium.

Furthermore, the invention according to claim 6 is a forgery prevention sticker characterized in that an adhesive layer is provided on the other surface of the base material of the forgery prevention medium according to any one of claims 1 to 5. It is.

  Since the present invention is configured as described above, the following effects can be obtained.

That is, an embossed part formed by embossing is provided on at least a part of one surface of the base material, and the embossed part has a color shift effect including a light interference pigment exhibiting an angle-dependent color shift. By providing the layer, the uneven shape based on the embossed part does not appear on the surface, so even if you try to create an embossed plate by taking the shape of the surface part, the embossed part has an embossed pattern on the embossed part Since it is not reflected, unauthorized duplication can be prevented.

  Furthermore, since the color shift effect layer is provided on the embossed portion, the change in hue and lightness in color shift can be complicatedly replaced by changing the direction of light reflection of the plurality of embossed portions. Therefore, the color shift variation can be increased and complicated. Therefore, authenticity determination using the anti-counterfeit medium and the anti-counterfeit sticker of the present invention can be more reliably performed, and it is possible to effectively prevent forgery, tampering prevention and other illegal prevention, illegal use, etc. it can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view showing a planar state of an embodiment of the anti-counterfeit medium of the present invention, and FIG. 2 is an explanatory view showing a schematic structure of a cross-sectional portion of the anti-counterfeit medium shown in FIG. is there. FIG. 3 is an explanatory view showing a planar state according to an embodiment of the anti-counterfeit sticker of the present invention, and (a) and (b) are explanatory views showing respective states observed by changing the viewing angle. FIG. 4 is an explanatory view showing a schematic configuration of a cross-sectional portion taken along line YY of the forgery prevention sticker shown in FIG.

  Hereinafter, the configuration of the anti-counterfeit medium 1 and the anti-counterfeit sticker 4 of the present invention, the constituent materials of each component, and the forming method will be described in detail.

As shown in FIG. 2, the anti-counterfeit medium 1 of the present invention is provided with an embossed portion 24 in which an embossed pattern is formed on a part of one surface of a base material 21 and a light absorbing layer 22 that absorbs predetermined light. A color shift effect layer 27 including a light interference pigment 23 exhibiting an angle-dependent color shift is provided on the light absorption layer 22 provided with the embossed portion 24. As shown in FIG. 4, the anti-counterfeit sticker 4 of the present invention absorbs predetermined light by the embossed portion 44 and the embossed portion 45 in which an embossed pattern is formed on a part of one surface of the base material 41. The color shift effect layer includes a light interference pigment 43 exhibiting an angle-dependent color shift on the light absorption layer 42 on which the embossed portion 44 and the embossed portion 45 are provided. 47 is provided. Reference numerals 26 and 46 denote non-embossed portions where no emboss pattern is formed, and reference numeral 48 denotes an adhesive layer provided on the other surface of the substrate 41.

  As the base material 21 and the base material 41, for example, paper such as art paper, coated paper, and high-quality paper, paperboard such as coated ball and coated manila, or special securities paper is used. Moreover, resin-made sheets, such as a white PET sheet and a white PVC sheet, are also used. The substrate 21 and the substrate 41 are not particularly limited to those described above, and may be a transparent resin sheet such as a transparent PET sheet or a transparent PVC sheet.

  The light absorption layers 22 and 42 efficiently absorb the light transmitted through the color shift effect layers 27 and 47 provided thereon, so that the color shift effect in the color shift effect layers 27 and 47 is more emphasized. When the base material 21 or 41 is expected to have such an effect, or the color shift effect layers 27 and 47 alone can provide the desired color shift effect. May not be provided. The color shift effect layers 27 and 47 generally use dark ink, for example, black ink, printing methods such as a known gravure printing method, offset printing method, screen printing method, bar coating method, gravure coating, etc. It may be formed by a coating method such as a method or a roll coating method.

On the other hand, the embossed portion 24 on the light absorbing layer 22, the embossed portion 44 on the light absorbing layer 42, and the embossed portion 45 have different angles at which color shifts observed in the color shift effect layers 22 and 42 described later are observed. This is a portion provided so as to change in a complicated manner, and is a portion where various emboss patterns are formed.

  As an emboss pattern, for example, the cross-sectional shape is a sawtooth shape or a mountain shape, and each tooth or each mountain portion in the emboss pattern has a shape that is substantially regularly arranged. The light reflection direction at the side portion to be controlled is regulated. More specifically, the cross-sectional shape has a sawtooth shape, and the cross-sectional shape of the portion corresponding to each tooth is a right triangle, and the corner portion that is not a right angle is located at the tip. Thus, what is arrange | positioned continuously can be mentioned as an example of a preferable emboss pattern.

  Such an embossed portion 24 is provided on the base 21 or on the light absorbing layer 26 and further positioned below the color shift effect layer 27, so that the embossed portion 44 and the embossed portion 45 are color-shifted. By positioning the light interference pigments 23 and 43 in the color shift effect layers 27 and 47 along the embossed shape of the embossed part 24 or the embossed part 44 as shown in the drawing by being positioned below the effect layer 45. And the embossed portion 45 can be arranged along the embossed shape. That is, the color shift in each color shift effect layer 27 or the color shift effect layer 47 is controlled according to the shape of the emboss pattern of the embossed portion located below.

  The size of the small protrusions corresponding to each tooth or mountain constituting each embossing pattern of the embossed portion 24, the embossed portion 44, and the embossed portion 45 is as follows. If the length of one side is around 1 mm, it can be said that it is preferable from the viewpoint of the embossing pattern. However, a rougher emboss pattern may be used. In short, it is only necessary to ensure an effective area necessary for the light interference pigments to be arranged in a state of exhibiting the color shift effect along the inclined surface portion of the small protrusion. Furthermore, if the angle between the inclined surface of each small protrusion with respect to the base material surface and the angle formed with the inclined surface of each other small protrusion of different embossed portions differ by approximately 45 °, the change of hue is easily observed. This is preferable. Such an angle is determined by the type and shape of the light interference pigment, and is not necessarily set to 45 °.

  The color shift effect layers 27 and 47 including the light interference pigment exhibiting the angle-dependent color shift are specifically composed of a thin film of ink containing the light interference pigment exhibiting the angle-dependent color shift, as described above. This is a portion that exhibits a color shift in that portion by changing the viewing angle.

  The light interference pigment is a light interference pigment such as natural mica or pearl pigment, or a surface of natural mica or pearl pigment coated with a metal oxide such as titanium oxide or iron oxide, with an average thickness of 0. Specific examples include those having a particle diameter of about 1 to 5 μm and an average particle diameter of about 2 to 300 μm. Depending on the coverage of the metal oxide, various color shifts related to the metallic luster color of gold, silver, or metallic can be exhibited. Here, the average particle diameter is a laser diffraction method average particle diameter, and a volume-based median diameter corresponds to 50% of the cumulative distribution.

Such a light interference pigment is kneaded in an ink medium to prepare a printing ink exhibiting an angle-dependent color shift, and is formed on an embossed part or by an embossed part and a non-embossed part by a known printing method such as a screen printing method. A color shift effect layer can be formed by printing on the part. In particular, the ink used is preferably a kneaded light interference pigment having a large specific gravity compared to the ink medium. When the color shift effect layer is formed with such ink, the ink thin film is formed. Before the ink is set, the light interference pigment sinks below the thin film, and the light interference pigment 23 and the light interference pigment 43 are arranged along the emboss pattern of the embossed portion. Can be controlled based on the surface shape of the emboss.

  On the other hand, the adhesive layer 28 of the anti-counterfeit sticker shown in FIG. 3 is equivalent to the adhesive layer of a general sticker, and if it does not alter or damage the base material 41 in contact with it, it is a general adhesive. Can be made of material. For example, vinyl chloride-vinyl acetate copolymer, polyester, polyamide, acrylic, butyl rubber, natural rubber, silicone, polyisobutyl adhesive alone, or alkyl methacrylate, vinyl ester, acrylonitrile, Addition of aggregating components such as styrene and vinyl monomers, unsaturated carboxylic acids, hydroxy group-containing monomers, modifying components such as acrylonitrile, polymerization initiators, plasticizers, curing agents, curing accelerators and antioxidants It is formed by adding an agent as necessary. For the formation of the adhesive layer 28, a known gravure printing method, offset printing method, screen printing method, or other printing method or coating method can be used.

  Hereinafter, the present invention will be described in detail with reference to examples.

  A light absorbing layer was formed by screen printing on the surface of the art coat tack paper on which the adhesive layer was not formed, using the following light absorbing ink. Next, as shown in the embossed portion 24 in FIG. 2, the cross-sectional shape is a sawtooth shape, and the cross-sectional shape of the portion corresponding to each tooth is a right triangle, and the corner portion is not a right angle. Using an embossed plate having an embossed pattern that is continuously arranged so that the embossed pattern is positioned at the tip, and forming an embossed pattern on a part of the light-absorbing layer formed in the step, Formed. Finally, a color shift effect layer is provided so as to cover the embossed portion and the non-embossed portion on the light absorbing layer by screen printing using an ink containing a light interference pigment having the following composition, and forgery of the present invention according to Example 1 Got prevention sticker.

[Light absorbing ink]
SS NSA 911 Black (Toyo Ink Manufacturing Co., Ltd.)
[Composition of ink containing light interference pigment]
Colorstream T10-01 (manufactured by Merck) 15 parts SS NSA medium (manufactured by Toyo Ink Manufacturing Co., Ltd.) 85 parts.

  When the obtained anti-counterfeit sticker is affixed to an article and observed from the front, the color shift effect layer portion corresponding to the portion where the embossed pattern is formed (embossed portion) appears green and the embossed pattern below The part of the color shift effect layer corresponding to the part where non-embossing is formed (non-embossed part) looks reddish purple, and the hue of each part changes by changing the viewing angle, making it easy to determine whether it is a genuine product It was confirmed that

  As the embossed plate, as shown in the embossed portion 44 and the embossed portion 45 in FIG. 4, the cross-sectional shape is a sawtooth shape, and the cross-sectional shape of the portion corresponding to each tooth is a right triangle, and An emboss pattern having a shape that is continuously arranged so that a corner portion that is not a right angle is positioned at the tip portion is formed on each of the light absorption layers using an emboss plate having two portions (A portion and B portion). The anti-counterfeit sticker of the present invention according to Example 2 was obtained in the same manner as in Example 1 except that the embossed portion was formed.

When the anti-counterfeit sticker thus obtained was affixed to an article and observed from the front, the A part appeared reddish purple and the B part appeared green. Next, when the observation angle was changed, the hues of the A part and the B part both changed, and the A part appeared green and the B part appeared reddish purple. As a result, according to this anti-counterfeit sticker, the hues of the two parts are observed differently at a certain viewing angle, and when the observation angle is changed, it appears that the hues are different from each other. It was confirmed that the determination of whether or not was easy and more reliable.

It is explanatory drawing which shows the planar state of one Example of the forgery prevention medium of this invention. It is explanatory drawing which shows the schematic structure in the cross-sectional part by the XX line of the forgery prevention medium of FIG. It is explanatory drawing which shows the planar state of one Example of the forgery prevention sticker of this invention, (a) and (b) of FIG. 3 are top views showing a state when a viewing angle is changed. It is explanatory drawing which shows the schematic structure in the cross-sectional part by the YY line of the forgery prevention sticker of FIG.

Explanation of symbols

1. Anti-counterfeit medium 4. Anti-counterfeit sticker 21, 41 ... Base material 22, 42 ... Light absorption layer 23, 43 ... Optical interference pigments 24, 44, 45 ... Embossed portion 26, 46 ... Non Embossed portions 27, 47..Color shift effect layer 28..Adhesive layer

Claims (6)

  A light absorption layer is provided on at least a part of one surface of the base material, and an embossed part formed with an emboss pattern is provided on at least a part of the light absorption layer. An anti-counterfeit medium, wherein a color shift effect layer including a light interference pigment exhibiting an angle-dependent color shift is provided on an embossed portion.   The anti-counterfeit medium according to claim 1, wherein the surface of the light interference pigment is coated with a metal oxide.   The embossed pattern has a sawtooth shape in cross-section, and the cross-sectional shape of the portion corresponding to each tooth is a right triangle, and the non-right angle corner is positioned at the tip. The anti-counterfeit medium according to claim 1, wherein the anti-counterfeit medium is arranged continuously.   The counterfeit according to any one of claims 1 to 3, wherein a non-embossed portion not formed with an embossed pattern is provided in addition to the embossed portion, and both are set to different hues or lightnesses. Prevention medium. The embossed pattern has a sawtooth shape in cross-section, and the cross-sectional shape of the portion corresponding to each tooth is a right triangle, and the non-right angle corner is positioned at the tip. The plurality of embossed portions are provided, and the directions of the sawtooth emboss patterns are different from each other. The forgery prevention medium in any one.   An anti-counterfeit sticker, wherein an adhesive layer is provided on the other surface of the base material of the anti-counterfeit medium according to any one of claims 1 to 5.