JP2005301093A - Medium for determining authenticity, medium label for determining authenticity, medium transfer sheet for determining authenticity, sheet capable of determining authenticity and information recording body capable of determining authenticity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium for determining authenticity capable of eliminating problems that it is difficult to shorten manufacturing time and that it is difficult to change the pattern of a decision part because many stages are required in manufacturing an embossing mold in the case of forming the decision part by embossed hologram. <P>SOLUTION: The problem can be solved by successively laminating an oriented film 3 and a light selective reflection pattern layer 4 on one surface of a base material 2 and laminating a reflection type hologram comprising a hologram forming layer 5 and a reflective layer 6 on the other surface to form the medium 1 for determining authenticity. The medium constituted by sequentially laminating the oriented film 3, the light selective reflection pattern layer 4, the hologram forming layer 5, and the reflective layer 6 on one surface of the base material 2 is equally well. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a medium for authenticity determination that can be distinguished from those obtained by forgery or falsification based on unauthorized intentions. The present invention also relates to such a medium for authenticity determination processed into a label form or transfer sheet form suitable for application to an article. Furthermore, the present invention also relates to a sheet and an information recording body to which the authenticity determination medium is applied.

  For example, credit cards, deposit and saving cards, various types of cash vouchers, or identification cards, etc., cause various troubles if they are counterfeited or tampered with and used illegally, so in order to prevent damage caused by forgery or tampering It is desirable to have a function that can identify the authenticity of each. In addition, for example, luxury products such as wristwatches, leather products, precious metal products or jewelry, in particular, what are said to be luxury brand products, audio products, electrical appliances, music software recorded on media, video software, game software, Alternatively, computer software is also subject to counterfeiting, and similarly, it is desirable to have a function that can identify authenticity.

  Conventionally, holograms are frequently used for the purpose of enabling authenticity identification of various articles including the above-mentioned articles. This is because the hologram has manufacturing difficulties due to the precision of its structure. However, the method of manufacturing a hologram is known to experts, and since it is precise, it is difficult to distinguish between a genuine hologram and a forged hologram.

Therefore, as a substitute for the hologram, a base material and a light selective reflection layer that is formed on one surface of the base material and reflects only one of the left-hand polarized light and the right-hand polarized light among the incident light. And a true / false determination body having a determination unit that includes determination information for determining a new product, which is formed on at least a part of the light selective reflection layer (see, for example, Patent Document 1).
JP 2000-25373 A (page 3-5, FIG. 1).

  In the authenticity determination body described in Patent Document 1, the determination part is still formed of an embossed hologram, and although it is possible to form a precise pattern as the determination part, the unevenness of the hologram engraved in the embossed shape is sufficient. In order to reproduce, it is necessary to sufficiently increase the contact time between the embossing mold and the material to be embossed, and it is difficult to shorten the manufacturing time, and the manufacturing process of the embossing mold itself has many steps. There is also a disadvantage that it is difficult to change the pattern.

  The problem of the present invention is that it is difficult to shorten the manufacturing time when forming the determination part with an embossed hologram, and there are many steps during the manufacture of the emboss mold, and it is difficult to change the pattern of the determination part. It is an object of the present invention to provide a true / false determination medium that can eliminate the above-mentioned problem.

  It has been found that the above-described problems of the present invention can be solved by, for example, forming a light selective reflection layer composed of cholesteric liquid crystal in a pattern and sequentially forming holograms behind the layer. Based on this, the present invention could be reached.

  In the first invention, a light selective reflection pattern layer composed of a layer of a material having a light selective reflection property that reflects either left circularly polarized light or right circularly polarized light in incident light, and each layer of a light diffraction structure layer are laminated. The present invention relates to a medium for authenticity determination.

  According to a second invention, in the first invention, the light selective reflection pattern layer is laminated on one side of the transparent substrate, and the light diffraction structure layer is laminated on the other surface of the transparent substrate. The present invention relates to a medium for authenticity determination characterized by the above.

  A third invention relates to the medium for authenticity determination according to the first invention, wherein the light selective reflection pattern layer and the light diffraction structure layer are laminated in this order on one side of a transparent substrate. Is.

  A fourth invention relates to a medium for authenticity determination according to any one of the first to third inventions, wherein the light diffraction structure layer is a reflection hologram.

  A fifth invention relates to a medium for authenticity determination according to any one of the first to fourth inventions, wherein the light diffraction structure layer is accompanied by a light reflective layer.

  A sixth invention relates to a medium label for authenticity determination, wherein an adhesive layer is further laminated on the medium for authenticity determination of any one of the first to fifth inventions.

  7th invention is related with the medium transfer sheet for authenticity determination characterized by the fact that the authenticity determination medium in any one of 1st-5th is laminated | stacked on the peelable surface of the peelable base material. .

  An eighth invention relates to a sheet capable of authenticity determination, characterized in that the authenticity determination medium according to any one of the first to fifth inventions is visible in a part of the sheet.

  According to a ninth invention, the authenticity determination medium of any one of the first to fifth inventions is laminated on the surface of an information recording body that is an authenticity determination target, or is visible on a part of the information recording body. The present invention relates to an information recording body capable of authenticity determination.

  According to the first invention, the light diffraction structure layer having a peculiar appearance generated by light diffraction is provided, and a latent image is formed in a normal state, but by irradiating left circularly polarized light or right circularly polarized light. Since it has a light selective reflection pattern layer to be visualized, in addition to the appearance in the normal state, it cannot be determined in the normal state, but it can be judged as authentic by irradiating left circularly polarized light or right circularly polarized light. The light selective reflection pattern can be easily formed by, for example, printing, etc., so that a medium for authenticity determination that does not increase the number of processes during manufacture and can be easily changed is used. Can be provided.

  According to the second invention, in addition to the effects of the first invention, the light selective reflection pattern layer and the light diffraction structure layer are laminated with the base material interposed therebetween. An authenticity determination medium that can be manufactured with less influence can be provided.

  According to the third invention, in addition to the effects of the first invention, since each layer is laminated only on one side of the base material, it is possible to use the exposed base material as a protective layer for authenticity determination. A medium can be provided.

  According to the fourth invention, in addition to the effects of any one of the first to third inventions, since the optical diffraction structure layer is configured by a hologram, it is possible to provide a true / false determination medium in which a hologram image can be visually recognized. Can do.

  According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, the optical diffraction structure layer is accompanied by the light reflective layer, so that the visibility of the appearance of the light diffraction structure layer is improved. Therefore, it is possible to provide a medium for authenticity determination.

  According to the sixth invention, there is provided a true / false determination medium label that can be easily applied to an article using an adhesive layer as a true / false determination medium capable of exhibiting the effects of any of the first to fifth inventions. Can be provided.

  According to the seventh invention, since the authenticity determination medium capable of exhibiting the effects of any of the first to fifth inventions is configured to be transferable, the authenticity determination medium that can be easily applied to articles. A transfer sheet can be provided.

  According to the eighth invention, since the authenticity determination medium of any one of the first to fifth inventions is applied, the authenticity determination sheet that enables the authenticity determination of the added information is provided. Can be provided.

  According to the ninth invention, since the authenticity determination medium according to any one of the first to fifth inventions is applied, an information recording body capable of authenticating itself is provided. can do.

  As illustrated in FIG. 1A, the authenticity determination medium 1 of the present invention is obtained by laminating an alignment film 3 and a light selective reflection pattern layer 4 in this order on the upper surface of a substrate 2 in the drawing. In addition, a hologram forming layer 5 is laminated as a light diffraction structure layer on the lower surface of the substrate 2 in the figure, and a reflective layer (also referred to as a light reflective layer) 6 is laminated on the lower surface of the hologram forming layer 5. It has a laminated structure. The hologram forming layer 5 has hologram fine unevenness on the lower surface side, and the reflective layer 6 is laminated along the fine unevenness. In this example, the light selective reflection pattern layer 4 and the hologram forming layer 5 and the reflective layer 7 are laminated with the base material 2 interposed therebetween. There are benefits that can be reduced.

  As illustrated in FIG. 1B, the authenticity determination medium 1 of the present invention has an alignment film 3, a light selective reflection pattern layer 4, a hologram formation layer 5, and reflectivity on the lower surface of the substrate 2 in the drawing. The layer 6 may have a stacked structure in which layers 6 are stacked in this order. The hologram forming layer 5 also has hologram fine unevenness on the lower surface side, and the reflective layer 6 is laminated along the fine unevenness. Thus, when each layer is laminated | stacked only on the one side of a base material, the advantage that the base material 2 which the upper surface exposed can be utilized as a protective layer will arise.

  In the above two examples, the light selective reflection pattern layer 4 is a layer made of a material having light selective reflectivity that reflects either left circularly polarized light or right circularly polarized light in incident light, for example, a cholesteric liquid crystal layer The pattern is formed by the presence or absence of the layer or the thickness of the layer. The reflective layer 6 is made of, for example, a metal thin film.

  In each example described with reference to FIG. 1, the light selective reflection pattern layer 4 may be composed of two types of light selective reflection pattern layers, which are composed of the same material and have a thickness. They may be different or have different differences such as different materials. Further, one of the two types of light selective reflection pattern layers may be a uniform and uniform layer.

  Further, in each of the examples described with reference to FIG. 1, all of the examples require an alignment film 3 different from the base material 2, but when the stretched plastic sheet is used as the base material 2, Since the surface of the material 2 originally has orientation, the lamination of the alignment film 3 can be omitted.

  As the base material 2, it is possible to reduce the thickness, and it is preferable to have a solvent resistance and a heat resistance that can withstand the mechanical strength and processing when manufacturing the authenticity determination medium 1. Since it depends on the purpose of use, it is not limited, but a film-like or sheet-like plastic is preferable. For example, various plastic films such as polyethylene terephthalate (PET), polycarbonate, polyvinyl alcohol, polysulfone, polyethylene, polypropylene, polystyrene, polyarylate, triacetyl cellulose (TAC), diacetyl cellulose, and polyethylene / vinyl alcohol can be exemplified. .

  The alignment film 3 may be any one as long as it can be generally used as an alignment film, such as polyvinyl alcohol resin (PVA) or polyimide resin. The alignment film 3 is formed by applying a solvent solution of these resins to the surface of the substrate 2 as described above by an appropriate application method and drying, followed by rubbing with a cloth, a brush, or the like. To do. When two or more light selective reflection pattern layers are provided, an alignment film provided as necessary between the light selective reflection pattern layers can be formed in the same manner.

  The light selective reflection pattern layer 4 is composed of a cholesteric liquid crystal layer. The cholesteric liquid crystal layer in the aligned state has a property of reflecting only one of left circularly polarized light and right circularly polarized light in incident light. The light selective reflection pattern layer 4 can be formed by applying a solvent solution of cholesteric liquid crystal in a pattern and drying it. Alternatively, at this time, an ultraviolet polymerizable composition is prepared using a polymerizable cholesteric liquid crystal. It can be used as a pattern, and after drying, it can be formed by irradiating with ultraviolet rays for polymerization.

  In order to form the light selective reflection pattern layer 4 in a pattern, it is preferable to use various printing methods. When two or more light selective reflection pattern layers 4 are provided, at least one of them is uniform. In order to form a uniform layer, it is preferable to use various coating methods.

  The hologram forming layer 5 has a relief hologram fine irregularities formed on one side of a layer made of a transparent resin material.

  As a transparent resin material for constituting the hologram forming layer 5, various thermoplastic resins, thermosetting resins, or ionizing radiation curable resins can be used. Thermoplastic resins include acrylic ester resins, acrylamide resins, nitrocellulose resins, or polystyrene resins. Thermosetting resins include unsaturated polyester resins, acrylic urethane resins, epoxy-modified acrylic resins, and epoxy-modified unsaturated resins. A polyester resin, an alkyd resin, a phenol resin, etc. are mentioned. These thermoplastic resins and thermosetting resins can be used alone or in combination of two or more. One or more of these resins may be cross-linked using various isocyanate resins, or various curing catalysts, for example, metal soap such as cobalt naphthenate or zinc naphthenate may be blended. Or peroxide such as benzoyl peroxide and methyl ethyl ketone peroxide for initiating polymerization with heat or ultraviolet light, benzophenone, acetophenone, anthraquinone, naphthoquinone, azobisisobutyronitrile, or diphenyl sulfide good. Examples of the ionizing radiation curable resin include epoxy acrylate, urethane acrylate, acrylic-modified polyester, etc., for the purpose of introducing a crosslinked structure into such an ionizing radiation curable resin or adjusting the viscosity, A monofunctional monomer, a polyfunctional monomer, or an oligomer may be blended and used.

  In order to form the hologram forming layer 5 using the above resin material, it can be formed directly by developing the photosensitive resin material by performing interference exposure of the hologram. It is preferable to perform molding by using a replica or a plating mold thereof as a replica mold and pressing the mold surface against the layer of the resin material. When thermosetting resin or ionizing radiation curable resin is used, curing is performed by heating or ionizing radiation irradiation while keeping the uncured resin in close contact with the mold surface, and then cured by peeling after curing. The fine irregularities of the relief hologram can be formed on one side of the layer made of a transparent resin material. A diffraction grating forming layer having a diffraction grating formed in a pattern by a similar method can also be used as the optical diffraction structure.

  The reflective layer 6 formed along the fine irregularities of the relief hologram may be either a reflective metal thin film or a transparent layer having a different refractive index of light from the hologram forming layer 5, and when the former is used. In the case of using the latter, a transparent hologram is obtained. In either case, a reflection hologram with improved visibility when viewed by illumination from the observer side is obtained.

  The materials constituting the reflective metal thin film include Al, Cr, Ti, Fe, Co, Ni, Cu, Ag, Au, Ge, Mg, Sb, Pb, Cd, Bi, Sn, Se, In, Ga, Alternatively, metals such as Rb, or oxides or nitrides of these metals can be used, and a reflective metal thin film can be formed by combining one or more of these metals. Among these, Al, Cr, Ni, Ag, Au, or the like is particularly preferable, and the film thickness is preferably 1 nm to 10,000 nm, more preferably 2 nm to 200 nm.

As a material constituting a transparent layer having a light refractive index different from that of the hologram forming layer 5, there are a resin material of the hologram forming layer and a transparent material having a different light refractive index. The light refractive index of the transparent material may be larger or smaller than the light refractive index of the resin of the hologram forming layer, but the difference in the light refractive index from the hologram forming layer 6 is 0.1 or more. Preferably, it is 0.5 or more, and particularly preferably 1.0 or more. Specific examples of suitable materials include titanium oxide (TiO ₂ ), zinc sulfide (ZnS), and Cu • Al composite metal oxide. In addition, since a metal thin film having a thickness of 20 nm or less also has transparency, it can be used as a material constituting a transparent layer having a refractive index different from that of the hologram forming layer 5.

  Whichever material is used, the reflective layer 6 can be formed by a known method such as sublimation, vacuum deposition, sputtering, reactive sputtering, ion plating, or electroplating.

  The authenticity determination method will be described using the authenticity determination medium 1 described with reference to FIG. First, when the authenticity determination medium 1 according to the present invention is observed under natural light, as shown schematically in FIG. 2 can be seen. At this time, the light selective reflection pattern layer 4 is transparent, but it is colored in a different color depending on the viewing angle of the medium 1 for authenticity determination, as shown in FIG. Thus, it appears as a colored image 8 ′. Here, if the light selective reflection pattern layer 4 is a layer made of a material having light selective reflection that reflects right circularly polarized light, when the left circularly polarized light enters the light selective reflective pattern layer 4, the left circularly polarized light is reflected. Is not reflected, the letter “A” is not visualized as shown in FIG. 2C, and only the hologram 7 is visible.

  In the case of the authenticity determination medium 1 described with reference to FIG. 1B, authenticity can be determined in the same manner as described above.

  Accordingly, the authenticity determination medium 1 of the present invention in which the light selective reflection pattern layer 4 and the hologram forming layer 5 described with reference to FIG. 1 are laminated is formed according to the viewing angle or by making the left circularly polarized light incident. Because it shows different reflectivity and looks different from the observer's point of view, it should be confirmed in advance how to see the authentic thing, or left circularly polarized light should be judged as genuine and true The true / false determination can be made by comparing the reflection or appearance by entering both. The observation of the left circularly polarized light incident on the light selective reflection pattern layer 4 may be performed by simply observing the left circularly polarizing plate superimposed on the light selective reflection pattern layer 4.

  The authenticity determination medium 1 of the present invention described with reference to FIG. 1 is processed into the form of a label or transfer sheet, as will be described next with reference to FIG. Can be easily applied to various articles to be applied.

  FIG. 3A relates to the form of the label, and the example shown in the figure has a laminated structure in which the base material 2, the light selective reflection pattern layer 4, the hologram forming layer 5, and the reflective layer 6 are laminated in this order. The authenticity determination medium label 11 is configured by laminating an adhesive layer 12 on the reflective layer 6 side of the authenticity determination medium 1. The authenticity determination medium 1 for constituting the authenticity determination medium label 11 is not limited to the above-described laminated structure, and each laminated structure described with reference to FIG. The laminated structure may be omitted.

  As in the above description with reference to FIG. 3 (a), it is more preferable to laminate the adhesive layer 12 on the reflective layer 6 side for use in authenticity determination, but the adhesive layer on the substrate 2 side. May be laminated. Whether the adhesive layer is laminated on which side of the authenticity determination medium 1 depends on whether the reflective layer 6 side or the substrate 2 side becomes the incident surface when labels are applied to various articles. Decide. When the reflective layer 6 is made of a reflective (that is, transparent) thin metal film, the base material 2 side is the incident surface. When the authenticity determination medium 1 is configured using a base material that requires the alignment film 3 such as a triacetylcellulose film, in order to see the latent image as described above, Alternatively, the left circularly polarized light may be incident from the reflective layer 6 side or from the base material 2 side. However, the surface has orientation such as a polyethylene terephthalate resin film or a polycarbonate resin film. When it is configured using a base material that is not required, it is necessary to make right circularly polarized light or left circularly polarized light incident from the reflective layer 6 side. In addition, when the adhesive bond layer is laminated | stacked on the base material 2 side, you may laminate | stack a protective layer on the reflective layer 6 side. The adhesive layer 12 may be various types of adhesive layers, but is preferably a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer.

  FIG. 3B relates to the form of the transfer sheet, and the example shown in the drawing is from a laminated structure in which the substrate 2, the light selective reflection pattern layer 4, the hologram forming layer 5, and the reflective layer 6 are laminated in order. An adhesive layer 12 is laminated on the reflective layer 6 side of the authenticity determination medium 1, and a peelable surface 14 a side of the peelable substrate 14 is laminated on the base material 2 side to authenticate the authenticity determination medium transfer sheet 13. Is configured. The authenticity determination medium 1 for constituting the authenticity determination medium transfer sheet 13 is not limited to the above-described laminated structure, but the laminated structures described with reference to FIG. It may have a laminated structure in which is omitted.

  In the case of the authenticity determination medium transfer sheet 13, as in the authenticity determination medium label 11, whether the side on which the adhesive layer is laminated is the authenticity determination medium 1 can be transferred to various articles. Is applied depending on whether the reflective layer 6 side or the substrate 2 side is the incident surface, and the peelable substrate 14 is laminated on the side where the adhesive layer 12 is not laminated. Again, the adhesive layer 12 can be various types of adhesive layers, but is preferably a heat sensitive adhesive layer or a pressure sensitive adhesive layer. The adhesive layer may be applied to the surface of various articles to which the authenticity determination medium 1 should be applied, and the transfer sheet may be configured without an adhesive layer.

  The pattern of the light selective reflection pattern layer 4 of the authenticity determination medium 1 of the present invention is based on the effect that the reflected light of different colors can be seen depending on the viewing angle or / and the lower hologram forming layer 4 or the reflective layer 5. In order to further improve the visibility of the hologram, a dark color layer such as a resin layer colored in a dark color such as black is preferably laminated on the lower layer side of each layer. When the adhesive layer 12 is laminated on the lower layer side as described with reference to FIG. 3, a dark color layer may be laminated between the reflective layer 6 and the adhesive layer 12, or Instead of laminating a separate dark color layer, the adhesive layer 12 may be configured using a dark color adhesive colored in a dark color such as black.

  The authenticity determination medium 1 of the present invention is preferably a variety of articles using the authenticity determination medium label 11 or the authenticity determination medium transfer sheet 13 as described above. Can be applied to. The authenticity determination medium label 11 is applied by sticking the adhesive layer 12 toward the article to be adhered, and the authenticity determination medium transfer sheet 13 is used. Then, after the adhesive layer 12 is adhered toward the article serving as the adherend, it is applied by peeling the peelable substrate 14.

  FIG. 4 is a diagram for explaining application of the authenticity determination medium 1 mainly for a sheet-like object. What is shown in FIG. 4A is an information recording body 15 capable of determining authenticity, in which the authenticity determination medium 1 is laminated on a part of the surface of the information recording body 16. The information recording body 16 is a sheet-like material whose base material is paper, plastic sheet or the like. In the example shown in the figure, information 17 such as an amount for use as a cash voucher, characters such as issuing company name, cautionary notes, or a coloring pattern. Is formed and recorded by means such as printing.

  In FIG. 4B, the authenticity determination medium 1 is built in a sheet-like material in advance so as to be visible, and a concave opening that does not become a through-hole in paper or a plastic sheet. 19 is configured so that the authenticity determination medium 1 can be seen from the opening 19, and the authenticity determination medium 1 has a very narrow width of about 0.5 mm to 5 mm as an example in order to facilitate application. In the case of paper, in the case of paper, when several layers constituting the paper are laminated, an opening 19 is provided in the layer constituting the surface layer, and the sheet-like material is cut. It is formed by applying a thread-like authenticity determination medium 1 between layers. If necessary, the thread-like authenticity determination medium 1 is colored with a dark color or the like on one side of the base material for the purpose of improving the visibility when irradiated with circularly polarized light, and is incorporated in a sheet-like material. In order to ensure the adhesiveness between the thread-like authenticity determination medium 1 and the sheet-like material in a state where the adhesive is used, an adhesive layer, preferably a heat-sensitive adhesive layer, may be laminated on one side or both sides. Such a sheet-like material to which the authenticity determination medium 1 is applied is suitable for use in an information recording body, in particular, a printed matter having a cash voucher or other economic value.

  The surface of the PET film was subjected to gravure printing using a polymerizable cholesteric liquid crystal ink, dried, and then irradiated with ultraviolet rays to form letters and designs to obtain a printed film. The polymerizable cholesteric liquid crystal ink used here is a polymerizable nematic liquid crystal (manufactured by BASF Corp., trade name: “Palio Color LC242”), a chiral agent (manufactured by BASF Corp., trade name: “Palio Color LC756”). ) And an ultraviolet polymerization initiator (the solvent is toluene), and the mixing ratio of the polymerizable nematic liquid crystal / chiral agent is 95.5 / 4.5. A polymerization initiator mix | blends 5% with respect to polymeric nematic liquid crystal.

  A transparent ultraviolet curable resin composition is applied to the surface opposite to the surface on which the obtained printing film was printed, and the surface of the relief hologram replica mold is irradiated with ultraviolet rays while being in contact with the transparent hologram. A relief hologram is formed by curing the ultraviolet curable resin composition, and then ZnS is vacuum-deposited on the surface of the relief hologram to form a transparent reflective layer having a thickness of 400 nm. Thus, a medium for authenticity determination was obtained.

  When the obtained authenticity determination medium is viewed from the reflective layer side, a hologram and printed characters and designs can be seen, and the hues of the printed characters and designs change depending on the angle at which the authenticity determination medium is viewed. In addition, when the left circularly polarizing plate is overlapped, only the hologram can be seen and the printed characters and designs can no longer be seen. Thus, the authenticity can be determined.

  A medium for authenticity determination was obtained in the same manner as in Example 1 except that characters and designs, relief holograms and reflective layers were formed on the same side of the PET film. When the obtained authenticity determination medium is viewed from the reflective layer side, a hologram and printed characters and designs can be seen, and the hues of the printed characters and designs change depending on the angle at which the authenticity determination medium is viewed. In addition, when the left circularly polarizing plate is overlapped, only the hologram can be seen and the printed characters and designs can no longer be seen.

  In the same manner as in Example 1, after characters and designs were formed on the surface of the PET film, another polymerizable cholesteric liquid crystal ink was formed on the surface on which the characters and designs were formed. Formed different characters and designs to obtain a printed film on which two characters and designs were formed. The polymerizable cholesteric liquid crystal ink used later is the same as that used in Example 1 except that the mixing ratio of polymerizable nematic liquid crystal / chiral agent is 96.2 / 3.8. . Thereafter, a relief hologram and a reflective layer are sequentially formed on the surface opposite to the surface on which the obtained printed film was printed in the same manner as in Example 1 to obtain a medium for authenticity determination. It was.

  When the obtained authenticity determination medium is viewed from the reflective layer side, a hologram and two types of characters and designs can be seen, and these two types of characters and designs have a hue depending on the angle at which the authenticity determination medium is viewed. When the left circularly polarizing plate is overlapped, the letters and designs printed with only the hologram visible are no longer visible, and thus it is possible to determine authenticity.

It is a figure which shows the example of the laminated structure of the medium for authenticity determination of this invention. It is a figure which shows the authenticity determination method using the authenticity determination medium of this invention. It is a figure which shows the label and transfer sheet | seat suitable for applying the authenticity determination medium of this invention to various articles | goods. It is a figure which shows the example of application of the medium for authenticity determination of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Medium for authenticity determination 2 ... Base material 3 ... Orientation film 4 ... Light selective reflection pattern layer 5 ... Hologram formation layer 6 ... Reflective layer 7 ... Hologram 8 ... Pattern 11 ... True False judgment medium label 13... True / false judgment medium transfer sheet 15...

Claims (9)

  A light selective reflection pattern layer composed of a material layer having a light selective reflection property that reflects either left circularly polarized light or right circularly polarized light in incident light, and each layer of a light diffraction structure layer are laminated. A medium for authenticity determination.   The authenticity determination according to claim 1, wherein the light selective reflection pattern layer is laminated on one side of the transparent substrate, and the light diffraction structure layer is laminated on the other surface of the transparent substrate. Media.   The medium for authenticity determination according to claim 1, wherein the light selective reflection pattern layer and the light diffraction structure layer are laminated in this order on one side of a transparent substrate.   The authenticity determination medium according to any one of claims 1 to 3, wherein the light diffraction structure layer is a reflection hologram.   The medium for authenticity determination according to any one of claims 1 to 4, wherein the light diffraction structure layer is accompanied by a light reflective layer.   An authenticity determination medium label, further comprising an adhesive layer laminated on the authenticity determination medium according to any one of claims 1 to 5.   6. A medium transfer sheet for authenticity determination, wherein the medium for authenticity determination according to claim 1 is laminated on a peelable surface of a peelable substrate.   A sheet capable of authenticity determination, comprising the medium for authenticity determination according to any one of claims 1 to 5 so as to be visible in a part of the sheet. The authenticity determination medium according to any one of claims 1 to 5 is laminated on a surface of an information recording body which is an object of authenticity determination, or is visible on a part of the information recording body. An information recording medium that can determine authenticity.

Images