JP2006145688A - Authenticity identifying body and authenticity identifiable base material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an authenticity identifying body having a new visual effect in which visibility of a hologram can be kept when a hologram and a cholesteric liquid crystal are combined, as well as an effect of changing colors depending on viewing angles induced by a color variable layer such as a cholesteric liquid crystal layer can be clearly recognized. <P>SOLUTION: The authenticity identifying body 1 is obtained by forming a color variable layer 5 on an upper surface of a lower surface of a reflective hologram composite body, forming a coloring layer 6 in the lower face side, and if necessary, further layering an adhesive layer 7, wherein the reflective hologram composite body comprises a transparent base material 2, a hologram forming layer 3 having a fine rugged pattern of a hologram on a lower face, and a reflective metal layer 4 along the fine rugged pattern. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an authenticity identifier that can be applied to, for example, an ID card and the like and can improve anti-counterfeiting properties, and is used for various applications to which such an authenticity identifier is applied. It also relates to a substrate capable of authenticity identification.

  In order to make it possible to confirm the authenticity of an article, a confirmation seal is often affixed to the article. For this purpose, a hologram formed in a seal shape is often used. This is because high technology is required to manufacture a hologram. However, since holograms have already been used for a long period of time, there are many cases where attempts are made to forge with unauthorized intentions. In this sense, holograms that are more difficult to counterfeit are required.

  On the other hand, it is also required that the authenticity of the hologram can be confirmed by simple means. For example, taking a credit card that is one of ID cards as an example, many types of credit cards are available and used in various situations, but it is a professional judgment to judge the authenticity of a credit card Since it is not a salesperson but a store salesperson or the like, a simple and time-saving method is required as a method for determining authenticity.

  Therefore, an attempt has been made to combine a hologram and a cholesteric liquid crystal to take into account the effect of changing the color depending on the viewing angle and the polarization effect caused by the cholesteric liquid crystal.

  For example, a forgery prevention body has been proposed in which a hologram is formed on a resin layer containing a cholesteric polymer liquid crystal pigment, and a high refractive index layer having a higher refractive index than the resin layer, a black layer as a colored layer, and the like are laminated. Yes. (Patent Document 1).

Alternatively, the hologram has fine irregularities formed on the cholesteric liquid crystal layer, and the fine irregularities are filled with a thermosetting resin or ionizing radiation curable resin to compensate for heat resistance, preferably with a dark or dark colored layer. An authentic identity structure has been proposed. (Patent Document 2).
Japanese Patent Application Laid-Open No. 2004-163797. JP2003-185835A.

  In any of the inventions described in Patent Document 1 and Patent Document 2, since the background of the layer provided with the hologram has a dark color layer, the effect of changing the color depending on the viewing angle generated by the cholesteric liquid crystal, and While the polarization effect is easy to see, the luminance of the hologram is poor and the visibility of the hologram is insufficient.

  In the present invention, when the hologram and the cholesteric liquid crystal are combined, the visibility of the hologram is ensured, and the effect of changing the color depending on the viewing angle generated by the color variable layer such as the cholesteric liquid crystal layer is clearly visible. It is an object of the present invention to provide an authenticity identifier having a new visual effect.

  According to the study by the inventors, a pattern with or without a reflective metal layer is formed on the reflective metal layer of a hologram with a reflective metal layer on the back surface using a laser beam or the like, and a cholesteric liquid crystal is formed on the observation side. By arranging the layers and arranging the black layer on the back side, or arranging the cholesteric liquid crystal layer and the black layer in order on the back side, the hologram can be visually recognized, and the pattern formed on the reflective metal layer is It was observed with the effect that the color changes depending on the viewing angle, and it was found to have a new visual effect, and based on this, the present invention could be reached.

  According to a first aspect of the present invention, there is provided a transparent base material, a hologram forming layer comprising a transparent resin layer laminated on the back surface of the transparent base material and having fine hologram unevenness on the back surface, and the fine unevenness of the hologram forming layer A reflective hologram composite composed of a reflective metal layer laminated, a color variable layer, and a colored layer, and the reflective metal layer has a pattern constituted by the presence or absence of the reflective metal layer. The color variable layer is laminated with the reflective hologram composite to form a laminate, and the authenticity identifier is characterized in that the colored layer is laminated on the back of the laminate. It is.

  A second invention relates to an authenticity identifier according to the first invention, wherein the color variable layer is a cholesteric liquid crystal layer.

  A third invention relates to an authenticity identification body according to the first or second invention, wherein the color variable layer is laminated on the observation side of the reflective hologram composite.

  According to a fourth invention, in the first or second invention, the authenticity identifier is characterized in that the color variable layer and the colored layer are sequentially laminated on the back side of the reflective hologram composite. It is.

  5th invention is related with the authenticity identification body of the sticking | bonding comprised by laminating | stacking the adhesive bond layer on the back surface of the authenticity identification body in any one of 1st-4th invention.

  6th invention is related with the base material which can authenticate authenticity comprised by the back surface of the authenticity identification body of any one of 1st-4th invention being laminated | stacked on the base material different from the said transparent base material. Is.

  According to a seventh aspect of the present invention, there is provided a substrate capable of authenticity identification, wherein the authenticity identification body according to any one of the first to fourth aspects of the present invention is configured so as to be visiblely embedded in a substrate different from the transparent substrate. It is about.

  According to the first invention, the reflective metal layer laminated along the fine irregularities of the hologram has a pattern depending on the presence or absence of the layer, and the color variable layer on the back side of the reflective metal layer or on the hologram viewing side In addition, since the colored layer on the back side is laminated, the colored layer in the lower layer appears in the part without the reflective metal layer, so the effect that the color changes depending on the viewing angle of the color variable layer is clear In addition, it is possible to provide a genuine discriminator having a new visual effect in which the visibility of the hologram is ensured in a portion having the reflective metal layer.

  According to the second invention, in addition to the effects of the first invention, there is provided an authenticity identifier that can clearly recognize the effect of changing the color depending on the viewing angle and the polarization effect, which are unique to the cholesteric liquid crystal layer. it can.

  According to the third invention, in addition to the effects of the first or second invention, since the color variable layer is laminated on the observation side of the reflective hologram composite, the color changes depending on the viewing angle of the color variable layer. Therefore, it is possible to provide an authenticity identifier with less unevenness in the effect to be achieved.

  According to the fourth invention, in addition to the effects of the first or second invention, since the color variable layer is laminated on the back side of the reflective hologram composite, the reflective metal layer is more than the color variable layer. Since it is laminated on the observation side, it is possible to provide an authenticity identification body with higher visibility of the hologram.

  According to the fifth invention, since the adhesive layer is laminated, it is easy to apply the authenticity identifier that can exert the effect of any one of the first to fourth inventions to the article. A sex identifier can be provided.

  According to the sixth invention, since the authenticity identification body according to any one of the first to fourth inventions is laminated on the base material, the authenticity identification that exhibits the effect of any one of the first to fourth inventions is possible. A substrate can be provided.

  According to the seventh invention, since the authenticity identifier of any one of the first to fourth inventions is visibly laminated on the base material, the authenticity that exhibits the effect of any one of the first to fourth inventions. An identifiable substrate can be provided.

  FIG. 1 is a diagram showing a basic laminated structure of the authenticity identifier of the present invention. As shown in FIG. 1A, in the authenticity identifier 1 of the present invention, one side of the transparent substrate 2 (the upper surface in the figure. In the following, the upper and lower sides are based on the upper and lower sides in the figure. In the authenticity identification body of the present invention, the color variable layer 5 is laminated on the upper surface side), and the hologram forming layer 3 made of a transparent resin is formed on the other surface (lower surface) of the transparent substrate 2. Are stacked. On the lower surface of the hologram forming layer 3, hologram fine irregularities are formed. On the lower surface of the fine irregularities, a reflective metal layer 4 and a colored layer 6, for example, a black layer, are laminated. , Having a pattern 4a depending on the presence or absence of a layer.

  As shown in FIG. 1B, in the authenticity identifier 1 of the present invention, the hologram forming layer 3 is laminated on the lower surface of the transparent base material 2, and the hologram forming layer 3 has fine irregularities on the hologram on the lower surface. The reflective metal layer 4 and the colored layer 6, for example, a black layer, are laminated on the lower surface of the fine irregularities, and the reflective metal layer 4 may have a pattern 4a depending on the presence or absence of the layer.

  That is, the authenticity identification body 1 of the present invention includes a transparent base material 2, a hologram forming layer 3 that is laminated on the back surface of the transparent base material 2, and has hologram fine irregularities on the back surface and is made of a transparent resin layer, and It has a reflective hologram composite comprising a reflective metal layer 4 laminated along the fine irregularities of the hologram forming layer 3, and the reflective metal layer 4 has a pattern 4a depending on the presence or absence of the layer. The color variable layer 5 is laminated on either the observation side or the back side of the reflective hologram composite to form a laminate, and the colored layer 6 is laminated on the back of the laminate.

  As shown in FIG. 3A, in the pattern 4a depending on the presence or absence of the reflective metal layer 4, the portions without the small circular reflective metal layer 4 are arranged, and the other portions have the reflective metal layer 4. However, as shown in FIG. 3 (b), the portions without the rectangular reflective metal layer 4 having a narrow width in the left-right direction and a long upper limit direction are arranged at equal intervals, and the other portions are formed by the reflective metal layer 4. As shown in FIG. 3 (c), there is a portion without the reflective metal layer 4 having a geometric shape (rectangular and star shape in the figure), and the other portion has the reflective metal layer 4. Or as shown in FIG.3 (d), it has a part without the reflective metal layer 4 of a character shape, and the other part can have a reflective metal layer 4, etc. can be illustrated. These patterns 4a are merely examples, and the patterns 4a can be freely determined mainly from the viewpoint of design, and may have shapes other than these. If these patterns 4a are positive patterns, they may be negative patterns.

  The size of the above-mentioned various shapes constituting the pattern 4a may be any size that can be resolved with the naked eye. If the color changes depending on the angle at which the cholesteric liquid crystal layer is viewed, The height and width are 1 mm × 1 mm or more, preferably 3 mm × 3 mm or more, and more preferably 5 mm × 5 mm or more. On the other hand, in the case of a long rectangular shape, the width is 1 mm or more, preferably 3 mm or more, more preferably 5 mm or more. In other shapes, the diameter of the inscribed circle is 1 mm or more, preferably 3 mm or more. Preferably it is 5 mm or more. In the case of letters, the circumscribed circle has a diameter of 1 mm or more, preferably 3 mm or more, more preferably 5 mm or more.

  In the description of the previous paragraph, the sizes of the various shapes constituting the pattern 4a are those that can be observed with the naked eye, and preferably those that can be easily observed with the naked eye. In some cases, the size is a fine pattern that is difficult to observe or cannot be observed by visual observation from a distance of clear vision, that is, normal observation.

  Also in the case of the fine pattern, the various shapes constituting the pattern 4a are the same as those described with reference to FIG. However, if the shape is a quadrangle, the size is 0.3 mm × 0.3 mm or less, preferably 0.1 mm × 0.1 mm or less, and about 0.01 mm × 0.01 mm or more. It is preferable. On the other hand, in the case of a long rectangular shape, the short side is 0.3 mm or less, preferably 0. 1 mm or less, preferably 0.01 mm or more. In the case of other shapes, if it is defined by the diameter of the inscribed circle, it is 0.3 mm or less, preferably 0.8 mm. 1 mm or less, preferably 0.01 mm or more, and 0.3 mm or less, preferably 0. 1 mm or less, preferably 0.01 mm or more.

  In the case of a fine pattern, the proportion of a portion of the reflective metal layer 4 constituting the pattern 4a is about 20% to 70% in order to ensure the effect that the color changes depending on the angle viewed by the color variable layer 5. Preferably, it is 30% to 60%. In terms of the visibility of the hologram, it is preferable that the ratio of a certain portion of the reflective metal layer 4 is higher, but if it is within the above range, there is no problem in the visibility of the hologram.

  The pattern 4a may be on the entire surface of the reflective metal layer 4 regardless of whether or not the various shapes constituting the pattern 4a can be observed with the naked eye. When the pattern 4a is in a part of the reflective metal layer 4, all other parts may be covered with the reflective metal layer 4, or the reflective metal layer 4 may not be present at all. Or the pattern comprised from the shape which can be visually observed and the pattern comprised from the shape which cannot be visually observed may be mixed.

  When the authenticity identifier 1 shown in FIG. 1A is observed from the color variable layer 5 side, the colored layer 6 in the lower layer can be seen in the portion having the pattern 4a where the reflective metal layer 4 is not present. In the portion where 6 is visible, the effect of changing the color depending on the viewing angle of the color variable layer 5 can be observed, and in the portion where the reflective metal layer 4 is present, the hologram can be seen.

  Further, when the authenticity identifier 1 shown in FIG. 1B is observed from the transparent base material 2 side, in the portion having the pattern 4a where the reflective metal layer 4 is not present, the lower color change layer 5 and Since the colored layer 6 under the color changing layer 5 is visible, in the portion where the colored layer 6 is visible, the effect of changing the color depending on the viewing angle of the color variable layer 5 can be observed, and the reflective metal layer In a certain part of 4, a hologram can be seen.

  The two authenticity identifiers 1 shown in FIGS. 1A and 1B have substantially the same appearance when observed from the upper surface side, but the effect of changing the color depending on the viewing angle of the color variable layer 5 is as follows. 1A is better than that described with reference to FIG. 1A, and the visibility of the hologram is better than that described with reference to FIG. 1A.

  The authenticity identification body 1 of the present invention has the basic laminated structure as described above, and the basic laminated structure can be used as it is. There is a method of applying to a material and imparting intrinsic discrimination to the applied substrate.

  FIG. 2 is a diagram illustrating an authenticity identifier 1 in a form suitable for application to another substrate. As shown in FIG. 2A, the authenticity identifier 1 is shown in FIG. As described with reference to a), the adhesive layer 7 may be laminated on the entire lower surface of the colored layer 6, and as shown in FIG. 2B, FIG. What was quoted and demonstrated may laminate | stack the adhesive layer 7 on the whole lower surface of the colored layer 6. FIG. By laminating the adhesive layer 7 in this way, there is an advantage that it is not necessary to provide an adhesive layer each time when the authenticity identification body 1 is applied to various articles, and the pasting is easy. Arise.

  The authenticity identifier 1 of the present invention described with reference to FIG. 1 or FIG. 2 is a so-called re-applied product that, when applied to various articles, is separated from the article for improper intention and applied to other articles. In order to enhance the prevention property, any one of the layers constituting the authenticity identifier 1 is made of a relatively weak material, or the adhesion between adjacent layers is weakened so as to be separated from the article. When doing, you may comprise so that it may be destroyed. For example, the applied authenticity identifier 1 is peeled by interposing a low-adhesive material or a brittle material between the transparent substrate 2 and the hologram forming layer 3 so as to reduce the adhesion between them. Then, the authenticity identifier 1 can be configured to be destroyed.

  As the transparent base material 2 of the authenticity identification body 1, those having mechanical strength and having solvent resistance and heat resistance that can withstand processing during manufacture or application to other articles are preferable. 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 color variable layer 5 may be any layer as long as the color changes depending on the viewing angle. The color variable layer 5 uses interference generated by a very thin transparent film comparable to the wavelength of light, or uses a cholesteric liquid crystal layer or the like. it can. Although the color variable layer 5 is drawn as a uniform layer, it may be a cholesteric liquid crystal pattern layer whose planar shape is a pattern.

  Among these, the cholesteric liquid crystal layer is in an aligned state, and has a property of reflecting either left circularly polarized light or right circularly polarized light in incident light, or each property. May be arranged, or a material having a property of reflecting only one of the left circularly polarized light and the right circularly polarized light may be mixed to have both polarization actions. In the case of using those having both left and right circularly polarized light, the hues of the two may be the same or different from each other. Such a cholesteric liquid crystal layer can be formed by applying a solvent solution of cholesteric liquid crystal by various coating methods and drying, or, at this time, an ultraviolet polymerizable composition using a polymerizable cholesteric liquid crystal. It can also be formed by applying the ultraviolet-polymerizable composition obtained by various coating methods, drying and polymerizing by irradiation with ultraviolet rays.

  When the cholesteric liquid crystal layer 4 is laminated on the transparent substrate 2, it is preferable to provide an alignment film on the side of the transparent substrate 2 on which the cholesteric liquid crystal layer 4 is laminated. The alignment film is polyvinyl alcohol. Any resin (PVA), polyimide resin or the like may be used as long as it can be used as an alignment film. The alignment film is obtained by applying a solvent solution of these resins to the surface of the transparent substrate 2 as described above by an appropriate application method and drying, followed by rubbing with a cloth, a brush, or the like. Can be formed. When laminating the cholesteric liquid crystal layer 4 on the surface of a material other than the transparent substrate 2, it is preferable to provide an alignment film as necessary.

  The hologram forming layer 3 is formed with hologram fine unevenness on the lower surface, but the layer itself can be formed using various materials capable of forming hologram fine unevenness. For example, the hologram forming layer 3 can be made of a transparent thermoplastic resin such as polyvinyl chloride, acrylic resin (eg, PMMA), polystyrene, or polycarbonate. Or unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, triazine acrylate Or a transparent thermosetting resin such as Further, the thermoplastic resin and the thermosetting resin are mixed and used, and further, a thermoformable substance having a radical polymerizable unsaturated group, or a radical polymerizable unsaturated monomer thereof. It can be constructed using a material that is ionized radiation curable by adding a body.

  The formation of the fine irregularities of the hologram on the hologram forming layer 3 is a composition for coating the transparent substrate 2 with the above resin by using a master on which diffraction gratings or interference fringes of the hologram are recorded in an irregular shape as a press mold. Is applied by means of gravure coating method, roll coating method, bar coating method, etc. to form a coating film, and the original plate is overlaid thereon, and both are heated by appropriate means such as a heating roll. This can be done by crimping or the like. Moreover, when using a photopolymer, after applying a photopolymer on the transparent base material 2 similarly, you may duplicate by irradiating a laser beam with the said original plate piled up.

  The reflective metal layer 4 is for increasing the diffraction efficiency of the fine irregularities of the hologram, and Cr, Fe, Co, Ni, Cu, Ag, Au, Ge, Al, Mg, Sb, Pb, Cd, Bi, Sn , Se, In, Ga, or Rb can be used, or oxides or nitrides of these metals can be used alone or in combination. Metal oxides, or nitrides thereof, are also included in the metal range. Among the above, Al, Sn, Cr, Ni, Cu, Au, or the like is particularly preferable. The reflective metal layer 4 is preferably formed by a thin film forming method such as a vacuum deposition method, a sputtering method, or an ion plating method, but may be formed by printing using a metallic ink containing a metallic pigment. .

  In order to form the pattern 4a depending on the presence or absence of the reflective metal layer 4, after the uniform reflective metal layer 4 is formed, the reflective metal layer 4 in the heated portion is used by using a spot heating means or the like. It is only necessary to form holes in the reflective metal layer 4 in accordance with a desired pattern shape by melting or vaporizing, and it is preferable to use laser light. When a point-like heating means such as laser light is used, the pattern 4a can be formed on the authentic authenticator 1 thus completed, which is suitable for forming a different pattern 4a for each authentic authenticator 1. The formation of the pattern 4a using the point-like heating means such as laser light can also be performed after applying the authenticity identifier 1 by applying it to various articles.

  The pattern 4a can be formed not only by the point heating means but also by forming the reflective metal layer 4 through a mask pattern, or after forming the uniform reflective metal layer 4, the resist A water-washing primer (water-soluble resin-based ink) is applied to the portion to be removed in advance by providing a pattern or etching, etc., and a uniform reflective metal layer 4 is formed thereon. You may carry out by washing with water later. The formation method of these patterns 4a is suitable for forming the same pattern, and is suitable for mass production of the same pattern. In addition, you may use together methods other than these dotted heating means, and a dotted heating means.

  The colored layer 6 is for facilitating observing the effect of the color variable layer 5 provided above the color changing depending on the viewing angle. In order to easily exhibit this effect, the colored layer 6 The color is a chromatic dark color or dark gray, more preferably black. The colored layer 6 may be transparent or opaque regardless of these colors. The colored layer 6 can be formed by a known printing method or coating method using a coloring material for giving a desired hue, for example, a colored layer forming composition containing a dye or pigment.

  Since the adhesive layer 7 is for ensuring the adhesiveness to various articles, the adhesive constituting the adhesive layer 7 has good adhesiveness with the colored layer 6 and is firmly attached to the adherend. Those that can be bonded are preferred. Specific examples include vinyl chloride resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymer resins, acrylic resins, polyester resins, polyurethane resins, polyamide resins, and rubber-modified products. Appropriately selected from the above can be used, and these can be used alone or in a mixture of two or more, and if necessary, hard resin, plasticizer, and other additives can be added and used. it can. In addition, a polyacrylic ester resin-based or rubber-based pressure-sensitive adhesive can also be used. When the adhesive layer 7 is composed of a pressure-sensitive adhesive, it is preferable to attach a peelable plastic film, a paper imparted with peelability, or the like to the surface of the pressure-sensitive adhesive.

  The authenticity identifier 1 of the present invention as described above can be used alone, but by applying it to an appropriate article that requires authenticity identification, it is possible to identify the authenticity of those articles. Can do.

  As shown in FIG. 4, the authenticity identification body 1 can be laminated | stacked on the appropriate base material 12, and it can be set as the base material 11 which can authenticate. 4A is a plan view, and FIG. 4B is a front view. Lamination can be performed by an appropriate method, but as shown in FIG. 2, if the authenticity identifier 1 in which the adhesive layer 7 is laminated on the lower surface of the colored layer 6 is used, the adhesive layer 7 is used. It can be laminated by bonding. When using an authenticity identifier without an adhesive layer, an adhesive layer is applied to at least one of the base 12 or the authenticity identifiers 1 to be bonded to each other as necessary.

  Further, as shown in the plan view of FIG. 5 (a) and the front view of FIG. 5 (b), the authenticity identifying body 1 is a tape having a narrow width, for example, a very narrow width of about 0.2 mm to 5 mm. Or what was processed into the shape of a thread-like thread is laminated on the upper surface of substrate 12, and it is good also as substrate 11 which can identify authenticity.

  As shown in the plan view of FIG. 6 (a), the authenticity identifier 1 processed into the shape of a thread has a part of the authenticity identifier 1 at the bottom of the recess 12a provided on the surface of the substrate 12. It may have appeared from. Specifically, as shown in the perspective view of FIG. 6B, the upper base material 12A having a hole (a through hole) 12a ′ and the lower base material 12B having no hole are provided. Is prepared, and the authenticity identification body 1 processed into a thread shape is sandwiched between the upper base material 12A and the lower base material 12B, so that the holes of the upper base material 12A 12a ′ forms a recess 12a on the upper surface of the substrate 12, and a part of the authenticity identifier 1 appears from the bottom of the recess 12a, and the authenticity identifier 1 is inside the substrate 12 at a portion other than the recess 12a. A laminated structure embedded in the substrate can be obtained. By taking such a laminated structure, the adhesiveness between the authenticity identifier 1 and the substrate 12 is further enhanced, and the visibility of the authenticity identifier 1 can be ensured.

  The authenticity identifier 1 of the present invention is highly valuable when applied to various articles that need to identify authenticity. There are various kinds of articles that need to identify authenticity, and the level of authenticity required is not constant, but the following can be exemplified.

  That is, as various articles that need to identify authenticity, there are an ID certificate, a voucher, a genuine product, a high-class brand product with a prominent brand, and the like for identification (ID) of the holder. The ID card is, for example, a passport, a driver's license, an insurance card, a book card (library lending card), or the like. A cash voucher is, for example, securities such as gift certificates or gift certificates, prepaid cards, and the like. Genuine products are parts, consumables, etc. for use in various devices and require genuine certification. Articles are used for electronic devices, electrical devices, computer products, printers, etc. Consumables, pharmaceuticals, chemicals, etc. High-end brand products include expensive products of famous brands such as watches, clothing, bags, jewelry, sports equipment, and cosmetics. Furthermore, media storing computer software, music software or video software can also be cited as various articles that require authenticity identification.

  Accordingly, the base material 12 in the base material 11 capable of authenticity identification according to the present invention may be the above-described article itself or a case of the article, and may be applied by attaching an authenticity identifier to the article. can do. Alternatively, it can also be applied by sticking it to the above article as a tag.

  After forming a uniform resin layer on one surface of a PET film having a thickness of 50 μm by applying an acrylic resin coating, and forming the fine irregularities of the hologram by hot embossing on the surface of this resin layer, Aluminum was vapor-deposited on the fine irregularities to form a reflective layer, and a hologram film capable of viewing the hologram from the PET film side was obtained.

  After performing rubbing treatment (orientation treatment) on the side of the hologram film obtained as described above on which no PET film is formed, gravure printing is performed using a cholesteric liquid crystal ink having right circular polarization on the treated surface. By this method, a cholesteric liquid crystal layer was formed on one side. As the cholesteric liquid crystal ink, polymerizable nematic liquid crystal (manufactured by BASF Corp., trade name: “Palio Color LC242”), chiral agent (manufactured by BASF Corp., trade name: “Palio Color LC756”) and UV polymerization start A 40% solution of the compounding agent (solvent is toluene) was used, and after gravure printing, it was cured by irradiation with ultraviolet rays.

  On the reflective layer side of the hologram film, a black layer was formed on one side by gravure printing, an adhesive was further applied, and a release paper (separate paper) was laminated on the adhesive surface. The product was punched into a predetermined shape to obtain a cholesteric liquid crystal / hologram composite label.

  The reflective layer of the cholesteric liquid crystal / hologram composite label obtained as described above was irradiated with a laser beam to record predetermined characters and marks, and observed from the cholesteric liquid crystal layer side. In the mark part, the underlying black layer is exposed, so the color changes depending on the viewing angle of the cholesteric liquid crystal layer, and in other parts, the hologram is observed due to the presence of the reflective metal layer. We were able to.

  In the same manner as in Example 1, after obtaining the hologram film, the rubbing treatment was performed on the reflective layer side, and then a cholesteric liquid crystal layer was formed on one side of the treated surface, and then the black color was formed on the cholesteric liquid crystal layer side. A layer was formed, a pressure sensitive adhesive was further applied, release paper was laminated on the pressure sensitive adhesive surface, and the product obtained as described above was punched to obtain a cholesteric liquid crystal / hologram composite label. The materials and application methods used were the same as in Example 1 except that the stacking order of each layer was changed. When recording using a laser beam was performed on the obtained cholesteric liquid crystal / hologram composite label, the same effect as in Example 1 could be obtained.

It is a figure which shows the basic laminated structure of an authenticity identification body. It is a figure which shows the laminated structure of the authenticity identification body which has an adhesive bond layer. It is a figure which shows the pattern of a reflective metal layer. It is a figure which shows the base material which applied the authenticity identification body. It is a figure which shows the base material to which the thread-like authenticity identification body is applied. It is a figure which shows the base material which embedded some thread-like authenticity identification bodies.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Authenticity discriminator 2 ... Transparent base material 3 ... Hologram formation layer 4 ... Reflective metal layer 5 ... Color variable layer 6 ... Colored layer 7 ... Adhesive layer 11 ... Authenticity discrimination Possible base material 12... Base material (12A; upper base material, 12B; lower base material, 12a; recess)

Claims (7)

  A transparent substrate, a hologram forming layer comprising a transparent resin layer laminated on the back surface of the transparent substrate, and having hologram fine irregularities on the back surface, and reflectivity laminated along the fine irregularities of the hologram forming layer A reflective hologram composite comprising a metal layer, a color variable layer, and a colored layer, wherein the reflective metal layer has a pattern constituted by the presence or absence of the reflective metal layer, and the color variable layer Is laminated with the reflective hologram composite to form a laminate, and the colored layer is laminated on the back surface of the laminate.   2. The authenticity identifier according to claim 1, wherein the color variable layer is a cholesteric liquid crystal layer.   3. The authenticity identification body according to claim 1, wherein the color variable layer is laminated on the observation side of the reflective hologram composite.   The authenticity identification body according to claim 1 or 2, wherein the color variable layer and the colored layer are sequentially laminated on the back side of the reflective hologram composite.   An authenticity identifier for sticking, wherein an adhesive layer is laminated on the back surface of the authenticity identifier in any one of claims 1 to 4.   5. A base material capable of authenticating identification, wherein the back surface of the authenticity identifying body according to claim 1 is laminated on a base material different from the transparent base material. A substrate capable of authenticity identification, wherein the authenticity identification body according to any one of claims 1 to 4 is configured to be embedded in a substrate different from the transparent substrate so as to be visible.

Images