JP6053258B2 - Anti-counterfeit medium, anti-counterfeit label, anti-counterfeit transfer sheet, and anti-counterfeit article - Google Patents

Description

  The present invention relates to an anti-counterfeit medium, an anti-counterfeit label, an anti-counterfeit transfer sheet, and an anti-counterfeit article on which they are adhered.

  Anti-counterfeiting technology is used for various items such as banknotes, bonds, gift certificates, checks, and other securities, and is also used for various certificates such as credit cards, ID cards, and official documents, and important documents. Recently, it has been applied to various products and packaging materials to ensure that the products are authentic. When these articles are inspected and proper anti-counterfeiting means are applied, they are determined as authentic articles, and when they are inappropriate, they are determined as non-authentic articles.

  Such forgery prevention means is generally divided into an overt technique and a covert technique. Overt technology is a technology that can be recognized as anti-counterfeiting technology by anyone and enables authenticity determination. For example, anti-counterfeiting means using a diffraction structure or multilayer interference film whose color and pattern change depending on the viewing angle Yes (Patent Document 1).

  These anti-counterfeiting means using diffractive structures and multilayer interference films change their colors and patterns depending on the viewing angle, so they do not require special detectors and do not require skilled skills. Can be recognized. For this reason, for example, when a general consumer purchases a product, it can be determined whether or not the product is genuine, but on the other hand, its existence is clear to a malicious person. It is easy to be targeted for counterfeiting and forgery.

  The covert technology is a technology in which the existence itself cannot be recognized unless it has a special detector or is well versed. For example, forgery prevention means in which a phase difference film is arranged in a pattern on a part of a light reflection film is exemplified. it can. With this forgery prevention means, the presence of the retardation film itself cannot be recognized. Therefore, when the polarizing film is overlapped on the retardation film as a detector and the polarizing film is rotated in the plane, the brightness changes in the shape of the retardation film with the rotation (Patent Document 2).

  Therefore, if such a phenomenon can be observed, it can be determined that the article is genuine, and if it cannot be observed, it can be determined that the article is a non-genuine counterfeit product or a fake product. The anti-counterfeiting means using the covert technology has a special detector in this way, and unless it is well-known, its existence itself cannot be recognized. For example, it is difficult for general consumers to determine at the store, On the other hand, since it is not clear to a malicious person, it is difficult to grasp as a target of forgery or forgery.

  There are various covert techniques besides anti-counterfeiting means in which a retardation film is arranged in a pattern on a part of the reflection film. For example, it is printed using a fluorescent ink that develops color when irradiated with ultraviolet rays. In this case, the existence itself cannot be recognized without an ultraviolet irradiation device.

  An anti-counterfeiting technique using the overt technique and the covert technique superimposed on each other is also known. A light reflection film is provided on the uneven surface constituting the diffraction grating, and a phase difference film is formed in a pattern on a part of the light reflection film. Discloses a forgery prevention medium. In this technology, the light reflecting film plays a role of reflecting and diffracting incident light to form a diffraction image and also changing the brightness and darkness of the retardation film through the polarizing film superimposed on it (patent) Reference 3).

JP 2005-099090 A JP 2006-142599 A JP 2006-043978 A

  An object of the present invention is to provide an unprecedented covert technique based on a novel technical principle. In the anti-counterfeit medium according to the present invention, when a polarizing film is superimposed on the medium at a specific angle, the pre-patterned medium is colored, or if the medium is a plain medium, the medium is colored. A latent image appears. For this reason, when this phenomenon can be observed, it can be determined that the medium and the article to which the medium is attached are genuine, and if it cannot be observed, it can be determined that the medium is a non-genuine counterfeit or forged product. It is.

As a means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that an inclined surface with respect to the surface direction is partially formed in a plane in which specific surfaces having an inclination and an equal inclination angle are arranged in a pattern. A structural reflection layer having a different angle, a retardation layer is provided on the side having the structure of the structural reflection layer, and a pattern concealing layer is provided on the surface of the retardation layer opposite to the surface in contact with the structural reflection layer. It is a forgery prevention medium characterized by being provided. Furthermore, an adhesive layer is provided on the side having no structure of the structural reflection layer.

According to a second aspect of the present invention, there is provided a structural reflecting layer having a slope , and having different angles formed by the inclined surface with respect to the surface direction within a plane in which specific surfaces having the same inclination angle are arranged in a pattern. And a retardation layer is provided on the side having the structure of the structural reflection layer.

Further, the present invention is characterized in that the structural reflection layer has a saw-shaped cross section in which right-angled triangles having one inclined side and different angles are continuously arranged.

Further, the present invention is characterized in that the structural reflection layer has a mountain-shaped cross section in which isosceles triangles inclined at both sides and having different angles are continuously arranged.

The present invention also provides a forgery prevention label characterized in that an adhesive layer is provided on the side of the anti-counterfeit medium that does not have the structure of the structural reflection layer.

Further, the present invention is characterized in that the anti-counterfeit medium or the anti-counterfeit label is provided with a release layer and a transfer substrate on the phase difference layer side, and an adhesive layer on the side having no structure of the structural reflection layer. To do.

In addition, the present invention is an anti-counterfeit article comprising either an anti-counterfeit medium, an anti-counterfeit label, or an anti-counterfeit transfer sheet.

In addition, the present invention is also applicable to the case where the anti-counterfeit medium, the anti-counterfeit label, the anti-counterfeit transfer sheet, or the anti-counterfeit article is overlapped with a polarizing film, and a partially different color is observed. The authenticity determination method is characterized by determining that the color is not authentic and determining that the color is not authentic.

  As described above, according to the anti-counterfeit medium of the present invention, different colors are exhibited by overlapping the polarizing films at a specific angle. When this color development can be observed, it is authentic, and when it cannot be observed, it is not authentic. In this way, it is possible to determine the presence or absence of forgery / forgery.

  The anti-counterfeit medium according to the present invention includes a structure reflection layer having a structure having partially different inclination angles, a surface reflection layer, and a retardation layer as essential components. Among the structural reflective layers having structures with partially different inclination angles, specific surfaces with the same inclination angle may be provided in a pattern. For example, characters, symbols, decorative patterns, and the like. By being provided in a pattern shape or a decorative pattern shape having a specific meaning in this way, it is possible to provide a function that is beautiful to the eye and provides meaningful information.

It is a conceptual sectional view showing an example of forgery prevention medium 1 formed by laminating structure reflection layer 11 and phase contrast layer 12 of the present invention. FIG. 4 is a conceptual cross-sectional view for explaining that the distance of light incident on the anti-counterfeit medium 1 of the present invention through the retardation layer 12 varies depending on the structure of the structural reflection layer 11. It is a conceptual perspective view which shows the example of the structural reflection layer 11 which has the saw-shaped cross section of this invention. It is a perspective conceptual diagram which shows the example of the structural reflection layer 11 in which the regular hexagonal pyramid of this invention, the regular pentagon with which the gravity center biased, and the star-shaped pentagonal pyramid are located in a cell form. 1 is a conceptual cross-sectional view showing an example of a forgery prevention medium 1 in which an intermediate layer 13 is provided between a structural reflection layer 11 and a retardation layer 12 of the present invention. 1 is a conceptual cross-sectional view showing an example of an anti-counterfeit medium 1 in which a structural reflection layer 11, a retardation layer 12, and a pattern hiding layer 14 of the present invention are laminated in order. It is the perspective conceptual diagram showing the state that the polarizing film 2 was piled up on the forgery prevention medium 1 of this invention, and authenticity verification was performed. It is a cross-sectional conceptual diagram of the label 5 for forgery prevention using the forgery prevention medium 1 of this invention. It is a cross-sectional conceptual diagram of the forgery prevention transfer sheet 6 using the forgery prevention medium 11 of the present invention. It is the perspective conceptual diagram which showed the forgery prevention article 7 which affixed the forgery prevention medium 11 of this invention, and the authenticity determination method which piles up the polarizing film 2 on the forgery prevention medium 1, and verifies authenticity.

  FIG. 1 is a sectional view showing an example of an anti-counterfeit medium 1 provided by laminating a structural reflection layer 11 and a retardation layer 12 which are essential components of the present invention. For example, when the retardation layer 12 is a retardation film provided in advance as a film, both can be laminated using an adhesive. In FIG. 1, the description of the adhesive is omitted.

  FIG. 2 is an explanatory cross-sectional view for explaining that the distance of light incident on the anti-counterfeit medium 1 having the structure shown in FIG. 1 through the retardation layer 12 varies depending on the inclination angle of the structure of the structural reflection layer 11. It is. The larger the angle θ formed by the structure inclined surface with respect to the surface direction, the longer the optical path length [length] 21 passing through the retardation layer 12, that is, the retardation value increases. Conversely, the smaller θ is, the shorter the optical path length [short] 22 is, and the smaller the phase difference value is. With such a mechanism, portions having different phase difference values are created partially within the same plane.

  The structural reflection layer 11 is formed by, for example, applying a heat and pressure to a mold or the like that has been cut into a structure in which the angle formed by the structural inclined surface with respect to the surface direction is partially different in a plane with respect to a substrate having a certain thickness. A method may be considered in which, after embossing to form a structure on the substrate, a metal thin film for reflecting light is formed.

  As the material of the base material, a fibrous sheet typified by paper, a resin film, or a composite thereof can be considered. When the reflective layer to be finally provided has light shielding properties, It is not necessarily transparent. For example, what laminated | stacked the thin resin film on the cardboard with the adhesive agent etc. can be considered. As the resin film, any material can be used as long as the structure formed by the mold can be maintained, such as a polyethylene terephthalate film, a polyethylene naphthalate film, and a polypropylene film.

  As the shape of the structure formed by the mold, it is sufficient that the structure has an inclination and the angle formed by the structure inclined surface with respect to the surface direction is partially different within the surface. Or a structure in which specific solids are arranged in a cell shape. Specifically, in a structure that is continuous in a uniaxial direction, a right-angled triangle that is inclined on one side has a saw-shaped cross section that is continuously arranged, or an isosceles triangle that is inclined on both sides is continuous. A shape with a mountain-shaped cross section arranged in a circle, or a shape that is cut into a quarter of a circle on one side, or has a semi-cylindrical cross-section arranged side by side, or on both sides One having a saddle-shaped cross-section in which semicircles having curved surfaces are continuously arranged can be considered. Here, for the sake of simplicity, an example such as a right triangle or an isosceles triangle is given, but in the case of a triangle, the position where the perpendicular from the apex to the base does not need to be the center or end of the base, and In the case of a graphic including one, one may be an inclined surface and the other may be a phase.

  Fig. 3 shows a structure in which a saw-shaped cross-section in which right-angled triangles inclined on one side are continuously arranged is formed in a uniaxial direction, and the angle between the surface direction and the inclined surface is partially different. It is a perspective view of the structural reflection layer 11 which shows the example. As a specific example of a structure in which specific solids are arranged in a cell shape, a shape in which cones are spread, a shape in which polygonal cones are spread, or the like can be considered.

  It is not necessary that the position where the perpendicular from the apex of these cones or polygonal cones is lowered to the bottom surface is the center of the bottom surface, and the shape of the bottom surface does not have to be a perfect circle or regular polygon. There can also be a star-shaped polygon.

  FIG. 4 is a perspective view of the structural reflection layer 11 showing an example in which a regular hexagonal pyramid, a regular pentagonal pyramid with a biased center of gravity, and a star-shaped pentagonal pyramid are arranged in a cell shape. Furthermore, a structure in which the uniaxial continuous structure shown as an example in FIG. 3 and the structure in which solids are arranged in a cell shape as shown in FIG. Further, a flat portion without inclination may be provided. The flat portion has a configuration in which the optical path that penetrates the retardation layer is the shortest.

  The structural reflective layer 11 formed on the substrate is provided with a reflective layer on the surface, and a vacuum deposition method, a sputtering method, a sol-gel method, a printing method, a spin coating method, and the like are conceivable. As the material of the reflective layer to be formed, various materials can be considered as long as they reflect light. For example, aluminum, copper, zinc, magnesium, titanium, chromium, manganese, iron, cobalt, nickel, silver, gold, tin, A material that reflects using the metallic luster of a metal such as platinum can be considered. In addition, a material that reflects using light total reflection using a high refractive index material such as zinc sulfide or zinc oxide, or a resin material in which glossy particles are dispersed can be considered.

  In the case of using the above-mentioned metal or high refractive index material for the reflective layer, a procedure for forming a thin film by a vacuum deposition method, a sputtering method, a sol-gel method, etc. after forming the structure of the structural reflective layer 11 by embossing or the like is considered. It is done. With this method, it is possible to form a multilayer film. When the multilayer film is formed, an effect of changing the color depending on the viewing angle without applying the polarizing filter 2 is added due to the multilayer thin film interference effect.

  In the case where a resin material in which glossy particles are dispersed is used, a procedure for forming the structure of the structural reflection layer 11 by embossing or the like after first depositing the material on the base material can be considered. As a typical method for forming a film of a resin in which glossy particles are dispersed on a substrate, a printing method or the like can be considered. Further, as the glossy particles to be dispersed, the above-described metal particles or pearl particles can be considered. In the case of using pearl particles, as in the multilayer film described above, there is also an advantage that an effect of changing the color depending on the viewing angle is added without applying the polarizing film 2. Color change technology using pearl particles is known.

  FIG. 5 shows a forgery by providing an intermediate layer 13 between the structural reflection layer 11 and the retardation layer 12 when the structural reflection layer 11 and the retardation layer 12 which are essential components of the present invention are laminated. 2 is a cross-sectional view showing an example of a prevention medium 1. FIG. For example, when the retardation layer 12 is provided by applying a liquid crystal or the like, an intermediate layer 13 having a thickness enough to fill the inclined portion is applied to the structural surface of the structural reflection layer 11 in advance and cured. Thus, the surface is flattened, and the intermediate layer 13 can also be used as an alignment film by performing a rubbing process, for example, in a uniaxial direction as an alignment process. The retardation layer 12 can be provided by applying a liquid crystal to the intermediate layer 13 that has been subjected to such an alignment treatment, and aligning and then curing.

  In the case where the retardation layer 12 is formed of liquid crystal, it is not always necessary to use the configuration of FIG. 5. The retardation is obtained by performing alignment treatment such as rubbing on the resin film, applying and aligning the liquid crystal, and then curing. When the layer 12 is laminated on the structural surface of the structural reflective layer 11 using an adhesive, the configuration is the same as that of FIG.

  In addition, the resin film in this method has anisotropy optically when a film produced by uniaxial stretching using a material such as polyethylene terephthalate or polyethylene naphthalate, It is necessary to adjust the retardation value of the retardation layer 12 in consideration of the direction of rubbing and the thickness of the liquid crystal to be applied. When is used, since it is optically isotropic, adjustment of the phase difference value becomes unnecessary.

  In addition, after applying a liquid crystal to a support base material, aligning and curing it to form a retardation layer 12, a combination of materials that reduce the adhesion between the support base material and the retardation layer 12 After laminating | stacking with the structural reflection layer 11 using an agent, the laminated body of the structural reflection layer 11 and the phase difference layer 12 can also be formed by transcribe | transferring by peeling a support base material.

  The supporting substrate in this case does not need to be transparent, for example, a glassine paper coated with silicon, such as a so-called seal separator, is applied to the silicon surface of a polyvinyl alcohol resin or polyimide resin, A substrate subjected to orientation treatment such as rubbing may be used as a base material, or a film of polyethylene terephthalate resin and a resin having low adhesion are applied as a release layer 93, and a polyvinyl alcohol resin or polyimide resin is applied thereon. Then, a substrate subjected to orientation treatment such as rubbing may be used as the base material. Further, paraffin wax, carnauba wax, polyethylene wax, silicon, or the like may be added to the resin of the release layer 93.

In addition, since this structure demonstrated using FIG. 5 is proposed as one of the means for laminating | stacking the structural reflection layer 11 and the phase difference layer 12, the intermediate | middle layer 13 was used in subsequent description. The configuration will be omitted as in the case of the adhesive in FIG.

  The configuration using only the structural reflection layer 11 and the retardation layer 12 which are essential components of the present invention has been described so far, but other layers may be laminated in addition to this. The other layer needs to be capable of transmitting light and is preferably optically isotropic. However, even if it is anisotropic, the anisotropy of the retardation layer 12 If it uses as a part, it is good.

  FIG. 6 is a cross-sectional view showing an example of the forgery prevention medium 1 in which the structural reflection layer 11, the retardation layer 12, and the pattern hiding layer 14 are sequentially laminated. In the configuration described so far, when observed from the surface of the retardation layer 12, the boundary line of the structural reflection layer 11 in which the angle formed by the structure inclined surface with respect to the surface direction is partially different within the surface is visually recognized. Therefore, for example, when a specific surface with the same inclination angle is provided in a pattern, the pattern can be visually recognized.

  Therefore, for example, by providing the pattern hiding layer 14 having a scattering effect, it can be seen as a plain medium at first glance. Specifically, for example, a resin containing about 10% of silica filler may be applied as the pattern concealing layer 14 and dried to be cured and formed. For example, a polyurethane resin can be considered as the resin.

  FIG. 7 is a perspective view showing a portion 3 where the polarizing film 2 is superimposed on the anti-counterfeit medium 1 so that the in-plane color is partially different or a colored latent image appears. .

  Next, FIG. 8 is a cross-sectional view of a label using the anti-counterfeit medium 1, that is, the label is formed by providing an adhesive layer 4 for the convenience of bonding and fixing to an article. The adhesive layer 4 is preferably provided on the structural reflection layer 11 of the anti-counterfeit medium 1, that is, on the surface having no structure, but when the article to be fixed is transparent, The adhesive layer 4 may be provided on the opposite surface, that is, the retardation layer 12 or the pattern hiding layer 14, and the adhesive layer 4 may be adhered and fixed to the article.

  In this case, the authenticity is judged through the transparent article. However, if the transparent article has a retardation value, it may affect the performance of the present invention, so it is necessary to consider it sufficiently. . Any adhesive can be used as the adhesive layer 4, and either a pressure sensitive adhesive or a heat sensitive adhesive may be used.

  FIG. 9 shows the anti-counterfeit transfer sheet 6 using the anti-counterfeit medium 1. The transfer sheet 6 for preventing forgery is constituted by laminating a transfer base material 91 and a transfer layer 92 so as to be peelable, and the transfer layer 92 is a part that moves to an anti-counterfeit article (transfer object) 7. The substrate 91 is a portion that is peeled off and removed from the transfer layer 92.

  The transfer layer 92 includes an adhesive layer 4 that adheres to an anti-counterfeit article 7 that is a transfer target and an anti-counterfeit medium 1, and is bonded and fixed to the anti-counterfeit article 7 by the adhesive layer 4. As shown in the figure, a release layer 93 may be disposed between the transfer base material 91 and the transfer layer 92 to enhance the peelability of the transfer base material 91 and the transfer layer 92. The release layer 93 may remain on the surface of the transfer target when the transfer substrate 91 is peeled off by transfer, or may be removed together with the transfer substrate 91.

When the release layer 93 remains on the surface of the transfer object, the release layer 93 also serves as a protective layer that protects the surface of the forgery prevention medium 1 from physical damage and chemical damage. The anti-counterfeit medium 1 is disposed so that the surface opposite to the structural reflection layer 11, that is, the retardation layer 12 or the pattern hiding layer 14 faces the transfer substrate 91, and is placed on the structural reflection layer 11. It is desirable to provide an adhesive layer 4.

  When the anti-counterfeit article 7 is transparent, the structural reflection layer 11 is disposed so as to face the transfer substrate 91, and the surface opposite to the structural reflection layer 11, that is, the phase difference layer 12 or the pattern hiding layer 14. It is also possible to provide an adhesive layer 4 on top. Any adhesive can be used as the adhesive layer 4, and either a pressure sensitive adhesive or a heat sensitive adhesive may be used. The transfer substrate 91 and the release layer 93 are both known.

  Next, FIG. 10 shows a case in which the polarizing film 2 is overlapped at a specific angle on the anti-counterfeit medium 1 fixed to the anti-counterfeit article 7 so that the in-plane partially develops a different color or the developed latent image. It is the perspective view showing the part 3 where appears. The specific angle is apparent from the description of FIG. 7, and if it can be confirmed that partial color development or the appearance of a latent image developed by such an operation can be confirmed, it is determined to be a genuine product, and if it cannot be confirmed, it is determined to be a counterfeit product. it can.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. As the retardation layer of the present invention, for example, a film made by forming a resin film can be considered. There are various stretching directions such as uniaxial stretching and biaxial stretching. In the uniaxial stretching, the orientation direction and the retardation value are relatively easy to control, and the design for obtaining the effects of the present invention is facilitated.

  In addition, a liquid crystal may be formed on an alignment film that has been subjected to alignment treatment. When liquid crystal is used, a more complicated design is possible, for example, the alignment direction is partially different within the plane. A retardation layer formed of such a material has a specific retardation value depending on the material, and the retardation value can be controlled by controlling the thickness.

  Generally, when the thickness is increased by stacking or the like, the retardation value increases. Light incident on a material having a phase difference value has different speeds of traveling light on each of the normal optical axis and the abnormal optical axis.For example, when the incident light is linearly polarized light, circularly polarized light, elliptically polarized light, Alternatively, the polarization direction is different, or the rotation direction is changed to linearly polarized light in the same direction by rotating more than one turn.

  When both surfaces of the retardation layer 12 are sandwiched between two polarizing films having the same polarization direction, the wavelength of the transmitted light can be controlled by the retardation value of the retardation layer 12. It looks colored.

  The relationship between the orientation direction of the retardation layer 12 and the polarization direction of the polarizing film 2 is most strongly set to 45 degrees when the orientation direction of the retardation layer 12 is uniformly uniaxial, for example. You can see it attached. In this case, when the phase difference value of the phase difference layer 12 is λ / 2 and it is observed so as to face directly between the light source and the observer, almost all visible light wavelengths are shielded and appear black. If the phase difference value is 3λ / 4, the color is blue, and if it is 7λ / 8, the color is light blue.

  Such a phenomenon can be observed even when one surface of the retardation layer 12 is the structural reflection layer 11 and the polarizing film 2 is provided on the opposite surface, but the retardation value to be expressed is determined by the optical path. In the case of this configuration in which the reflective layer is provided, the phase difference value is doubled because it passes through the phase difference layer 12 twice on the way and back.

  Also, unlike the previous configuration, for example, in such a configuration, the alignment direction of the retardation layer 12 is uniformly uniaxial, and the angle formed between the alignment direction and the polarizing film 2 is 45 degrees. When the phase difference value is λ / 4 and the light source and the observer are approximately on the same optical axis, and the medium is observed so as to face the observer, the substantial phase difference value is λ / 2. It blocks the light wavelength and appears black. When the retardation value of the retardation layer 12 is 3λ / 4, the phase difference is purple. When the retardation value of the retardation layer 12 is λ / 2, the retardation layer 12 is almost transparent.

  Thus, it can be seen that the wavelength of light transmitted through the polarizing film 2 and observed by the observer varies depending on the optical path length passing through the retardation layer 12. Therefore, even if the retardation layer 12 has the same thickness and the retardation value of one surface is the same, if the optical path length can be varied in the surface, the wavelength that is partially transmitted through the polarizing film 2 in the surface can be set. Can be different.

  The present invention is provided based on such a technical principle. In order to prevent complication of explanation, the orientation direction of the retardation layer is uniformly uniaxial in the plane, and the angle formed with the polarization direction when the effect is verified by the polarizing film 2 is 45 degrees. However, other methods are conceivable as described above.

  By cutting, the angle formed from the surface direction to the inclined surface is 45 degrees, the inclined length is 100 micrometers, and the portion having a structure in which the saw-shaped cross section is continuous in a uniaxial direction draws a T-shape, A mold having a flat portion other than that was prepared.

  A polyolefin adhesive was applied to a stretched polyethylene terephthalate film having a thickness of 16 micrometers, about 3 micrometers, dried in an oven at a temperature of 100 ° C. for 1 minute, and then coated on a coated paper having a basis weight of 90 kilograms at a temperature of 160 ° C. Lamination was performed while applying temperature and moderate pressure.

  By applying a mold to this polyethylene terephthalate film surface, applying a temperature of 130 ° C. and a pressure of 2 tons, and forming a 500 Å film of aluminum on the embossed surface using vacuum deposition, structural reflection Layer 11 was formed.

  Subsequently, 100 parts by weight of a mixture of 95 parts / 5 parts of water / isopropyl alcohol as a solvent was mixed with 10 parts by weight of polyvinyl alcohol resin (trade name: POVAL 117 (manufactured by Kuraray Co., Ltd.)). This was prepared as an ink for the intermediate layer 13. After applying using a wire bar and drying in an oven at a temperature of 100 ° C. for 2 minutes, the structure reflective layer 11 is visible with a rubbing cloth (trade name: FINE PUFF YA-20-R (manufactured by Yoshikawa Chemical Co., Ltd.)). The rubbing process was performed in a direction where the angle formed by the T-shaped linear direction was 45 degrees. The thickness of the dried intermediate layer 13 is 3 micrometers.

  Subsequently, the retardation ink shown below was coated on the intermediate layer 13 with a wire bar, and the retardation layer 12 was cured using a high-pressure mercury lamp with an irradiation energy of 500 millijoules. The film thickness of the retardation layer 12 after curing is 6 micrometers.

(Ink for phase difference)
Liquid crystal (trade name: Paliocolor LC242 (manufactured by BASF)): 30 parts by weight
Polymerization initiator (trade name: Irgacure 184, manufactured by Ciba Geigy Japan)
: 1.5 parts by weight
Solvent (toluene / MEK = 1/1): 68.5 parts by weight
In the anti-counterfeit medium 1 thus obtained, a T-shaped pattern is normally visible on the surface, but when the polarizing film 2 is overlapped so that the polarization direction matches the T-shaped straight line, the T-shaped portion becomes red, It was confirmed that the other portions were colored green.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the spirit of the present invention.

  The present invention is expected to utilize a seal shape that is attached to a package or tag of a high-grade product that is likely to generate a counterfeit product. The pattern of the structural reflection layer 11 is a brand logo mark of a product manufacturer and the image color of the logo mark is developed by overlapping the polarizing film 2. Such a seal appears to have a black and white brand logo at first glance, so the product counterfeiters create labels that resemble only the appearance. By checking the presence or absence of coloration of the image color by overlapping the polarizing film 2, it is possible to determine the authenticity of the label, that is, whether it is a genuine product or a counterfeit product.

DESCRIPTION OF SYMBOLS 1 ... Anti-counterfeit medium 2 ... Polarizing film 3 ... The part which has developed the color which is partially different, or the colored latent image has appeared 4 ... Adhesive layer 5 ... Anti-counterfeit label 6 ... Anti-counterfeit transfer sheet 7 ... Anti-counterfeit article 11 ... Structural reflection layer 12 ... Retardation layer 13 ... Intermediate layer 14 ... Pattern hiding layer 21 ... -Optical path length [long]
22 ... Optical path length [short]
91 ... Transfer base material 92 ... Transfer layer 93 ... Release layer

Claims (5)

  A side having a structure reflecting layer having a structure in which the angle formed by the inclined surface with respect to the surface direction is partially different in a plane in which a specific surface having an inclination and an equal inclination angle is provided in a pattern. A retardation layer is provided on the surface of the retardation layer opposite to the surface on which the structural reflective layer is in contact, and a pattern concealing layer is provided on the side having no structure of the structural reflective layer. Anti-counterfeit label characterized by that.   A side having a structure reflecting layer having a structure in which the angle formed by the inclined surface with respect to the surface direction is partially different in a plane in which a specific surface having an inclination and an equal inclination angle is provided in a pattern. An anti-counterfeit label characterized in that an adhesive layer is provided on the side that is provided with a retardation layer and does not have the structure of a structural reflection layer. Transfer sheet for preventing forgery which is characterized in that in the counterfeit prevention label provided on the retardation layer side release layer and the transfer substrate according to any one of claims 1-2. Anti-counterfeit article characterized by comprising any one of the transfer sheet for preventing forgery according to claim 1 counterfeit prevention label according to any one of 2 or claim 3,. Anti-counterfeit article of claim 1 counterfeit prevention label according to any one of two or transfer sheet for preventing forgery according to claim 3, or claim 4, overlaid polarizing film, partially A true / false determination method characterized by observing a different color and determining that the color is authentic if it can be confirmed, and determining that the color is not authentic if the color cannot be confirmed.