JP2006276090A - Authenticity identifying body and base material capable of identifying authenticity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel authenticity identifying body which unnecessitates the more complexity of appearance and the more easiness of judgement of authenticity with respect to a hologram used for confirmation of authenticity and the like. <P>SOLUTION: The authenticity identifying body 1 is composed of a cholesteric liquid crystal layer 3 formed on the upper surface or the lower surface of a transparent substrate 2, a hologram formation layer 4 formed on the lower surface of them and a reflective metal layer 5 along fine ruggedness of the hologram formation layer 4, wherein the reflective metal layer 5 is formed so as to present a pattern shape when seeing from the upper surface. In this way, the authenticity identifying body is formed. It is preferable that the cholesteric liquid crystal layer is bilayered and it is further preferable that an adhesive layer 7 is laminated on the lower surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

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, it is often performed to attach an authenticity confirmation seal to the article. For example, a hologram seal in which a hologram is formed in a seal shape is often used. This is because a high level of technology is required to manufacture a hologram. However, holograms have already been used for a long period of time, and there are many cases where attempts are made to forge due to unauthorized intentions. In this sense, there is a demand for holograms that are more difficult to counterfeit.

  On the other hand, the hologram is also required to be authentic by simple means. For example, taking a credit card, which is one of ID cards, as an example, many types of credit cards are available and used in various situations. However, it is not necessarily specialized to determine the authenticity of a credit card. Therefore, many of them are store salespersons. Therefore, a simple and time-saving method is required as a method for determining authenticity.

Therefore, it has been proposed to provide a diffracted light or a hologram image corresponding to a portion of the metal vapor deposition layer by partially applying a metal vapor deposition layer to the hologram. (Patent Document 1).
In addition, attempts have 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, hologram concavo-convex undulations are formed on the cholesteric liquid crystal layer itself, and these undulations are filled with a thermosetting resin or ionizing radiation curable resin to compensate for heat resistance, preferably accompanied by a dark or dark colored layer. An authentic authentication structure has been proposed. (Patent Document 2).
JP-A-4-104188. JP2003-185835A.

  According to the invention described in Patent Document 1, it is possible to give a hologram a pattern caused by the presence or absence of a metal vapor deposition layer. According to the invention described in Patent Document 2, a viewing angle generated by a cholesteric liquid crystal. The effect of changing the color can be added to the hologram by the above, but in the former, the area where the hologram can be seen and the area where the hologram cannot be seen are only separated, and in the latter, the hologram is difficult to see, Only the effect based on the cholesteric liquid crystal layer is added to the entire surface of the hologram. Therefore, in any case, it has been required to be accompanied by further complexity of appearance and easy determination of authenticity.

  It is an object of the present invention to provide a new authenticity identifier in which a hologram used for authenticity confirmation or the like does not require much more complex appearance and ease of determination of authenticity. is there.

  By the inventors' investigation, on the combination of the hologram and cholesteric liquid crystal formed as separate layers, by forming the reflective metal layer with the hologram into a pattern, in the part with the reflective metal layer in the lower layer, The visibility of the hologram can be ensured, and in the part where there is no reflective metal layer in the lower layer, the effect of changing the color depending on the viewing angle, which is caused by the cholesteric liquid crystal, can be demonstrated, and both these effects are divided into patterns, An authenticity identifier with a complex appearance could be obtained.

  1st invention is a hologram formation layer by which the fine unevenness | corrugation of the hologram was formed in the non-observation side of the cholesteric liquid crystal layer laminated body by which the cholesteric liquid crystal layer was laminated | stacked on the at least one side of the transparent base material on the surface of the transparent resin layer The present invention relates to an authenticity identifier, wherein a reflective metal layer is laminated in a pattern on the surface of the hologram forming layer on which fine irregularities are formed.

  A second invention relates to the authenticity identifier according to the first invention, wherein the cholesteric liquid crystal layer laminate is obtained by laminating the cholesteric liquid crystal layer on the observation side of the transparent substrate. It is.

  A third invention relates to the authenticity identifier according to the first invention, wherein the cholesteric liquid crystal layer laminate is obtained by laminating the cholesteric liquid crystal layer on the non-observation side of the transparent substrate. Is.

  According to a fourth invention, in the first invention, the cholesteric liquid crystal layer laminate is obtained by laminating the cholesteric liquid crystal layer on each of the observation side and the non-observation side of the transparent substrate. It relates to an authenticity identifier.

  A fifth invention relates to an authenticity identifier according to any one of the first to fourth inventions, wherein at least a part of the cholesteric liquid crystal layer has a pattern shape.

  6th invention is related with the authenticity identification body of the sticking | bonding comprised by laminating | stacking the adhesive bond layer on the said reflective metal layer side of the authenticity identification body of the invention in any one of 1st-5th.

  A seventh invention relates to a substrate capable of authenticity identification, wherein the authenticity identifier of any of the first to fifth inventions is configured by laminating the reflective metal layer side on another substrate. .

  An eighth invention relates to a substrate capable of authenticity identification, wherein the authenticity identification body of any one of the first to fifth inventions is configured to be visiblely embedded in another substrate.

  According to the first invention, the hologram forming layer and the cholesteric liquid crystal layer are formed as separate layers, and the reflective metal layer is laminated in a pattern on the surface of the hologram forming layer on which the fine irregularities are formed. It is easy to see the hologram in the part where the reflective metal layer is laminated, and in the part where the reflective metal layer is not laminated in the lower layer, it is easy to confirm the effect that the color changes depending on the viewing angle caused by the cholesteric liquid crystal, By observing through the circularly polarizing plate or the left circularly polarizing plate, it is possible to confirm the presence or absence of right circularly polarized light or left circularly polarized light. Since an easy-to-see part is observed in a pattern, it is possible to provide a genuine discriminator having a complex appearance and high authenticity. Can.

  According to the second invention, in addition to the effects of the first invention, since the cholesteric liquid crystal layer is laminated on the observation side of the transparent substrate, the authenticity identification that makes it easier to confirm the effects caused by the cholesteric liquid crystal. The body can be provided.

  According to the third invention, in addition to the effect of the first invention, since the transparent substrate is on the observation side, it is possible to provide an authenticity identifier having a high protective effect on the surface of the cholesteric liquid crystal layer.

  According to the fourth invention, in addition to the effects of the first invention, since the cholesteric liquid crystal layers are laminated on both surfaces of the transparent substrate, by using the cholesteric liquid crystal layers having different characteristics, It is possible to provide an authenticity identifier having a more complicated effect of changing the color depending on the viewing angle.

  According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, since at least a part of the cholesteric liquid crystal layer has a pattern shape, the effect that the color changes depending on the viewing angle is at least in the pattern. An authenticity identifier obtained accordingly can be provided.

  According to the sixth 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 fifth inventions to the article. A sex identifier can be provided.

  According to the seventh invention, since the authenticity identification body of any one of the first to fifth inventions is laminated on the base material, the authenticity identification capable of exhibiting the effect of any one of the first to fifth inventions is possible. A flexible substrate can be provided.

  According to the eighth invention, since the authenticity identifier of any of the first to fifth inventions is visibly laminated on the base material, the authenticity of any one of the first to fifth inventions is exhibited. A substrate capable of sex identification can be provided.

  FIG. 1 and FIG. 2 are views showing a laminated structure of the authenticity identifier of the present invention. 3 and 4 are diagrams showing a pattern of the reflective metal layer in the authenticity identification body shown in FIGS. 1 and 2, and particularly FIG. 4 is a diagram showing a fine pattern. 5 and 6 are diagrams illustrating a process of forming a pattern of the reflective metal layer. FIG. 7 to FIG. 9 are diagrams showing a base material capable of authenticity identification, in which the authenticity identifier of the present invention is applied to another base material.

  As shown in FIG. 1 (a), the authenticity identifier 1 of the present invention is a single side of a 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. The cholesteric liquid crystal layer 3 is laminated on the other side (lower surface) of the transparent base material 2, and the hologram forming layer 4 made of a transparent resin is laminated on the other surface (lower surface) of the authenticity identification body. The formation layer 4 has a hologram with fine irregularities formed on its lower surface. Further, a reflective metal layer 5 is laminated in a pattern along the fine irregularities on the hologram forming layer 4. When the cholesteric liquid crystal layer 3 is laminated on the observation side of the transparent substrate 2 as in the authenticity identifier 1 shown in FIG. 1A, the effect produced by the cholesteric liquid crystal layer 3 can be more easily confirmed.

  As shown in FIG. 1B, in the authenticity identifier 1 of the present invention, the cholesteric liquid crystal layer 3 may be laminated on the lower surface side of the transparent substrate 2, and in this case, the hologram forming layer 4 is cholesteric. The reflective metal layer 5 is laminated in a pattern along the fine irregularities on the lower surface of the liquid crystal layer 3. When the cholesteric liquid crystal layer 3 is laminated on the non-observation side of the transparent base material 2 in this way, the transparent base material 2 becomes the observation side, so that the surface of the cholesteric liquid crystal layer 3 (upper surface) is protected. Is expensive.

  As shown in FIG. 2A, in the authenticity identifier 1 of the present invention, the cholesteric liquid crystal layer A (reference numeral 3A) on the observation side of the transparent substrate 2 and the cholesteric liquid crystal layer B (reference numeral 3B) on the non-observation side. In other words, two cholesteric liquid crystal layers A and B (reference numerals 3A and 3B) may be laminated on both surfaces of the transparent substrate 2. A hologram forming layer 4 and a reflective metal layer 5 are laminated in a pattern on the lower surface of the cholesteric liquid crystal layer 3B. When the cholesteric liquid crystal layers A (reference numeral 3A) and B (reference numeral 3B) are laminated with the transparent substrate 2 interposed therebetween, an authenticity discriminator having a more complicated effect of changing the color depending on the viewing angle is provided. can do. Further, as compared with the case where both cholesteric liquid crystal layers A and B are laminated on the same side of the transparent substrate 2, the solvent in the cholesteric liquid crystal composition used in the lamination step has an adverse effect on the cholesteric liquid crystal layer previously laminated. There is also an advantage that this can be avoided.

  As shown in FIG. 2B, in the authenticity identifier 1 of the present invention, the cholesteric liquid crystal layer A (reference numeral 3A) is laminated on the observation side of the transparent substrate 2, and the cholesteric liquid crystal layer A (reference numeral 3A). ), The cholesteric liquid crystal layer B (reference numeral 3B) may be laminated in a pattern on the observation side. On the lower surface, a hologram forming layer 4 and a reflective metal layer 5 are laminated in a pattern. There can be several variations of the cholesteric liquid crystal layer B (reference numeral 3B) laminated in a pattern. For example, the cholesteric liquid crystal layers A (reference numeral 3A) and B (reference numeral 3B) may be reversed in the order of stacking, or only the patterned cholesteric liquid crystal layer B (reference numeral 3B) lacks the cholesteric liquid crystal layer A (reference numeral 3A). May be.

  In the above description, the cholesteric liquid crystal layers A (reference numeral 3A) and B (reference numeral 3B) are laminated on the observation side of the transparent substrate 2, but are laminated on the non-observation side of the transparent substrate 2. Also good. Further, the cholesteric liquid crystal layer A (reference numeral 3A) and the patterned cholesteric liquid crystal layer B (reference numeral 3B) are not on the same side of the transparent substrate 2, but across the transparent substrate 2, that is, both sides of the transparent substrate 2. May be laminated separately. As described above, when at least a part of the cholesteric liquid crystal layer has a pattern shape, there is an effect that the effect of changing the color depending on the viewing angle is obtained at least according to the pattern.

  FIG. 3 is a diagram illustrating a pattern of the reflective metal layer 5 stacked in a pattern. As shown in FIG. 3A, the pattern has a reflective metal layer in which squares having a narrow width in the left-right direction and long squares in the vertical direction are arranged at equal intervals. The pattern may be a striped pattern arranged at intervals equal to (width), or, as shown in FIG. 3 (b), the reflective metal layer 5 has a geometric shape (rectangular shape in the figure). Star shape). Moreover, when a specific pattern as described above is used as a positive pattern, the pattern may be a negative pattern thereof. Note that these patterns are merely examples, and the patterns can be freely determined mainly from the viewpoint of design, and may be characters or symbols other than geometric shapes, or arbitrary shapes. Further, the pattern may be synchronized with the hologram of the hologram forming layer 4.

  The size of the pattern is not limited as long as it can be resolved with the naked eye. However, when observing the change in color depending on the viewing angle of the cholesteric liquid crystal, the colored layer 6 is 1 mm in length and width if the shape is square. × 1 mm or more, preferably 3 mm × 3 mm or more, more preferably 5 mm × 5 mm or more. In the case of a geometric shape, if it is circular, the diameter is 1 mm or more, preferably 3 mm or more, more preferably 5 mm or more, and in the case of other shapes, the diameter of the inscribed circle is 1 mm or more, preferably It is 3 mm or more, more preferably 5 mm or more.

  As shown in FIGS. 4A and 4B, the reflective metal layer 5 may be laminated in a fine pattern. As shown in FIG. 4 (a), the pattern in this case (fine pattern) is a reflective metal consisting of a strip of finite width facing from the left side toward the upper side toward the right side in the figure. The layer 5 may be a fine line-shaped fine pattern arranged in the width direction at a pitch twice the width, or the fine pattern may be a circle as shown in FIG. The reflective metal layer 5 having a fine shape or a square shape may be arranged at an equal pitch.

  These fine patterns are only examples, and the patterns constituting the fine patterns can be freely determined. Therefore, they have geometric shapes other than line patterns or halftone dots, or shapes such as letters or symbols. There may be. The size of the pattern constituting the fine pattern is preferably a fine one that is difficult to observe or cannot be observed by normal observation. In the case of a line pattern, the line width is 0.3 mm or less, The thickness is preferably 0.1 mm or less, and may be considerably small as long as it can be formed, but is preferably about 0.01 mm or more in practice. When the halftone dot is circular, the diameter is 0.3 mm or less, preferably 0.1 mm or less, and preferably about 0.01 mm or more. In addition, when the halftone dots are square, the length and width are 0.3 mm × 0.3 mm or less, preferably 0.1 mm × 0.1 mm or less, and preferably about 0.01 mm × 0.01 mm or more. . In the case of other shapes, the diameter of the inscribed circle is 0.3 mm or less, preferably 0.1 mm or less, and preferably about 0.01 mm or more.

  When the pattern is a fine pattern, an outer shape pattern (in the case of FIG. 4 (a) or (b), the outer shape of the rectangle) can be arbitrarily set. The pattern may be synchronized with the pattern of the hologram on the hologram forming layer 4.

  When the reflective metal layer 5 constitutes a fine pattern, the area ratio of the reflective metal layer 5 is 20% to 80%, more preferably 30% to 60%.

  When the reflective metal layer 5 is formed in a pattern, in the portion where the reflective metal layer 5 is in the lower layer, the hologram of the hologram forming layer 4 can be seen well, and in the portion where the reflective metal layer 5 is not present in the lower layer, The hologram cannot be seen well, and it can be observed that the color changes depending on the viewing angle due to the presence of the cholesteric liquid crystal layer 3. Further, in the case of the reflective metal layer 5 in which the reflective metal layer 5 is formed in a fine pattern, a hologram can be seen in an area where the fine pattern is present, that is, in the outer shape pattern, and is seen due to the presence of the cholesteric liquid crystal layer 3. It can also be observed that the color changes depending on the angle.

  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 usage in which it is applied to a material to impart authenticity discrimination to the applied substrate.

  When the authenticity identifier 1 is applied to another base material, the authenticity identifier 1 may be formed by laminating an adhesive layer on the lower surface of the material described with reference to FIG. 1 or FIG. By laminating the adhesive layers in this way, when the authenticity identifier 1 is applied to various articles, it is not necessary to provide an adhesive layer each time, and there is an advantage that the pasting is easy. .

  When the authenticity identifier 1 of the present invention described with reference to FIGS. 1 to 4 is applied to various articles, the authenticity identifier 1 is prevented from being separated from the article for improper intention and applied to other articles. In order to enhance the so-called re-sticking prevention property, the article is formed by constituting any one of the layers constituting the authenticity identifier 1 with a relatively fragile material or weakening the adhesion between adjacent layers. It may be configured to be destroyed when attempting to separate from the. For example, an attempt is made to peel off the applied authenticity identifier 1 by interposing a low-adhesive material or a brittle material between the transparent substrate 2 and the hologram forming layer 4 to reduce the adhesiveness between the two. Then, it can comprise so that the authenticity identification body 1 may be destroyed.

  As the transparent base material 2 of the authenticity identification body 1, a material having mechanical strength and having solvent resistance and heat resistance that can withstand processing at the time of manufacture or application to other articles is 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. .

  An alignment film is preferably provided on the transparent substrate 2 on the side on which the cholesteric liquid crystal layer 3 is laminated, and the alignment film can be generally used as an alignment film such as polyvinyl alcohol resin (PVA) or polyimide resin. Any one of them may be used. The alignment film is formed 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 do.

  The cholesteric liquid crystal layer 3 is in an aligned state and has a property of reflecting only one of the left circularly polarized light and the right circularly polarized light among the incident light, or has each property. The materials may be arranged, or a material having the 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. Utilizing the property of reflecting either the left circularly polarized light or the right circularly polarized light, the left circularly polarized light or the right circularly polarized light is reflected by observing through the right circularly polarizing plate or the left circularly polarizing plate. Can be confirmed.

  The cholesteric liquid crystal layer 3 also exhibits a different hue depending on the viewing angle depending on the helical pitch of the cholesteric liquid crystal constituting the layer and the thickness of the layer. 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 3 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 preparing a product, applying the obtained ultraviolet polymerizable composition by various coating methods, drying and polymerizing by irradiation with ultraviolet rays. In the case of forming the cholesteric liquid crystal layer 3 in a pattern, it can be performed by a known printing method using the solvent solution of the cholesteric liquid crystal or the ultraviolet polymerizable composition.

  The hologram forming layer 4 is formed with hologram fine irregularities on the lower surface, but the layer itself is a variety of thermosetting resins, thermoplastic resins, ionizing radiation curable resins capable of forming hologram fine irregularities. It can be configured using materials such as. For example, the hologram forming layer 4 can be made of a transparent thermoplastic resin such as polyvinyl chloride, an acrylic ester resin (eg, PMMA), an acrylamide resin, a nitrocellulose resin, or a polystyrene resin. Alternatively, it can be composed of a thermosetting resin such as unsaturated polyester, acrylic urethane resin, epoxy-modified acrylic resin, epoxy-modified unsaturated polyester resin, alkyd resin, or phenol resin. These resins can be constituted singly or in combination of two or more, if necessary, various isocyanates, metal soaps such as cobalt naphthenate or zinc naphthenate, peroxides such as benzoyl peroxide or methyl ethyl ketone peroxide, Thermal or ultraviolet initiators such as benzophenone, acetophenone, anthraquinone, naphthoquinone, azobisisobutyronitrile, or diphenyl sulfide may be blended. Examples of the ionizing radiation curable resin include epoxy acrylate and acrylic modified polyester. If necessary, the ionizing radiation curable resin may contain other monofunctional or polyfunctional monomers, oligomers, and the like for the purpose of adjusting the crosslinked structure and viscosity.

  The formation of the fine unevenness of the hologram on the hologram forming layer 4 is performed by using the original plate on which the diffraction grating and the interference fringes of the hologram are recorded in the form of unevenness as a press mold, and using the above resin as a coating composition on the transparent substrate 2. The prepared material is applied by means such as gravure coating method, roll coating method, bar coating method, etc. to form a coating film, and the original plate is overlaid thereon, and the both are thermocompression bonded by appropriate means such as a heating roll. This can be done by doing so. Moreover, when using a photopolymer, after apply | coating a photopolymer on the transparent base material 2 similarly, you may duplicate by superimposing the said original plate and irradiating a laser beam.

  The reflective metal layer 5 is for increasing the diffraction efficiency of the fine irregularities of the hologram, and Al, Cr, Ti, Fe, Co, Ni, Cu, Ag, Au, Ge, Mg, Sb, Pb, Cd, Bi , Sn, Se, In, Ga, or a reflective metal such as Rb can be used, or these oxides or nitrides can be used alone or in combination. For convenience, oxides of reflective metals or nitrides thereof are also included in the range of reflective metals. Among the above, Al, Cr, Ni, Ag, Au, or the like is particularly preferable. The thickness of the reflective metal layer 5 is preferably 1 to 10000 nm, and more preferably 2 to 200 nm.

As the reflective metal layer 5, in addition to the above, any material can be used for the thin film for forming a transparent hologram as long as it is light-transmissive so that the hologram effect can be exhibited. For example, there is a transparent material having a refractive index different from that of the resin of the hologram forming layer. The refractive index in this case may be larger or smaller than the refractive index of the resin of the hologram forming layer, but the difference in refractive index is preferably 0.1 or more, more preferably 0.5 or more. Zero or more is optimal. In addition to the above, there is a metallic reflective film having a thickness of 20 nm or less. Examples of the transparent thin film that can be suitably used include titanium oxide (TiO ₂ ), zinc sulfide (ZnS), and Cu · Al composite metal oxide. The reflective metal layer 5 is preferably formed by a thin film forming method such as a vacuum deposition method, a sputtering method, or an ion plating method, but can also be formed by a printing method using a metallic ink containing a metallic pigment. .

  The reflective metal layer 5 can be formed in a pattern by various methods. When the reflective metal layer 5 is formed, the layer can be formed in a pattern, for example, the above thin film formation method can be performed through a pattern mask, or can be performed by a printing method. After forming a uniform reflective metal layer, it can also be performed by the following method of removing unnecessary portions.

  As shown in FIG. 5, the reflective metal layer 5 can be patterned using a water-soluble resin pattern. In FIG. 5 and FIG. 6 quoted in the following description, layers other than the hologram forming layer 4, such as the transparent substrate 2, the cholesteric liquid crystal layer 3, and the like are omitted.

  As shown in FIG. 5A, first, a hologram forming layer 4 having a hologram with fine irregularities formed on its lower surface is prepared. Next, as shown in FIG. 5B, a water-soluble resin pattern 6 is formed on a portion of the hologram forming layer 4 on which the fine irregularities are formed, where the reflective metal layer 5 is unnecessary. The water-soluble resin pattern 6 is formed by printing using a water-soluble resin composition in which a water-soluble resin or a water-swellable resin is dissolved or dispersed, so-called water-soluble ink. Further, as shown in FIG. 5C, the reflective metal layer 5 is formed on one surface on which the water-soluble resin pattern 6 is formed. Thereafter, water or an acidic or alkaline aqueous solution or the like is brought into contact with the surface on which the reflective metal layer 5 is formed to remove the water-soluble resin pattern 6 and the portion where the water-soluble resin pattern 6 has been laminated. By removing the reflective metal layer 5, as shown in FIG. 5 (d), the reflective metal layer 5 where the water-soluble resin pattern 6 is not laminated remains, and the reflective metal layer 5 is patterned. Formed.

  As shown in FIG. 6, the reflective metal layer 5 can be patterned using a resist pattern. First, as shown in FIG. 6A, first, a hologram forming layer 4 having a hologram with fine irregularities formed on its lower surface is prepared. Next, as shown in FIG. 6B, a reflective metal layer 5 is formed on one surface of the hologram forming layer 4 on which fine irregularities are formed. Further, as shown in FIG. 6C, a resist pattern 7 is formed on the lower surface of the reflective metal layer 5 where the reflective metal layer is required. Thereafter, an etching solution is allowed to act on the surface on which the resist pattern 7 is formed, and the reflective metal layer 5 in a portion other than the portion covered with the resist pattern 7 is etched and removed, as shown in FIG. As described above, the reflective metal layer 5 in the portion covered with the resist pattern 7 remains, so that the reflective metal layer 5 is formed in a pattern. Note that the resist pattern 7 remaining on the reflective metal layer 5 formed in a pattern may be left as it is. However, if desired to be removed, the remaining resist pattern 7 is removed by dissolution or the like.

The method performed using the water-soluble resin pattern or resist pattern is suitable for manufacturing a large number of authenticity identification bodies 1 having the same pattern.
In addition to the above-described various methods, the reflective metal layer 5 is patterned by partially heating the reflective metal layer 5 and melting or evaporating the heated portion of the reflective metal layer 5. There is a method, which may be performed by heating with a thermal head or laser light irradiation, and these methods can be performed after the authenticity identification body 1 is created, and if anything, patterning based on individual information Suitable for performing.
The various patterning methods for patterning the reflective metal layer 5 can be used in any combination.

  Since the adhesive layer is for ensuring the adhesiveness of the authenticity identifier 1 to various articles, the adhesive constituting the adhesive layer includes the reflective metal layer 5 and the hologram forming layer 4. What has good adhesiveness and can adhere | attach an adherend firmly is preferable. 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 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 can be used alone, but by applying it to appropriate articles that require authenticity identification, the authenticity of those articles can be identified.

  As shown in FIG. 7, 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. FIG. 7A is a plan view, and FIG. 7B is a front view. Lamination can be performed by an appropriate method, but if an authenticity identification body in which an adhesive layer is laminated on the lower surface of the reflective metal layer 5 is used, lamination can be performed by using this adhesive layer for adhesion. . 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. 8 (a) and the front view of FIG. 8 (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. 9A, 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. 9 (b), the upper base material 12A having a hole (a through hole) 12a ′ and the lower base material 12B having no hole. 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. When the upper substrate 12A is thin or has transparency, the authenticity identifier 1 is visually recognized through the upper substrate 12A even in the portion where the authenticity identifier 1 is embedded in the substrate 12. Can do.

  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 deposit / save card, a credit card, a driver's license, an insurance card, a book card (library lending card), or the like. The cash vouchers are, for example, transportation tickets, banknotes, gift certificates, gift certificates, securities, securities such as stocks, voting tickets for public competitions, 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. There are consumables (paper, ink cartridges, toner cartridges, etc.), pharmaceuticals, chemicals, and the like. High-end brand products include well-known brands and usually expensive products such as watches, clothing, bags, jewelry, sporting goods, 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 as a tag (tag) to the above article.

  After applying a cholesteric liquid crystal coating composition on one side of a 50 μm thick PET film, drying and ultraviolet irradiation were sequentially performed to form a cholesteric liquid crystal layer. As a composition for coating cholesteric liquid crystal, polymerizable nematic liquid crystal (manufactured by BASF Corporation, trade name: “Palio Color LC242”), chiral agent (manufactured by BASF Corporation, trade name: “Palio Color LC756”) In addition, a 20% toluene solution containing a UV polymerization initiator was used, and the polymerizable nematic liquid crystal / chiral agent in the coating composition was set to 95.5 / 4.5.

  On the opposite side of the cholesteric liquid crystal layer, an acrylic resin paint was applied to form a uniform resin layer, and the surface of the resin layer was heat embossed to form fine irregularities on the hologram. . On the surface of the fine irregularities formed, water-soluble resin ink (manufactured by Oike Kogyo Co., Ltd., product name: “SLNo. 14 clear”) is used, and the shape of the aluminum vapor deposition film to be formed next is removed. A gravure printing method was used to form a water-soluble resin pattern. After printing, an aluminum thin film is uniformly formed by vapor deposition on the entire surface of the fine unevenness on which the water-soluble resin pattern is formed. The aluminum thin film was removed together with the water-soluble resin pattern to form a pattern made of the aluminum thin film, thereby obtaining an authenticity identifier. The obtained authenticity identifier was able to observe a hologram at a location where an aluminum thin film was present, and at the location where there was no aluminum, an effect of changing the color depending on the viewing angle was obtained.

  It was possible to produce a label by applying an adhesive on the side of the authenticity identification body having the aluminum thin film, overlaying a release paper on the coated surface, and punching it into an appropriate shape. The produced label could be affixed to various articles by removing the release paper. Also, instead of pressure sensitive adhesive and release paper, those coated with a heat sensitive adhesive layer can be thermocompression bonded by heating and pressurizing the heat sensitive adhesive layer side as the target paper or plastic substrate side. did it. In addition, when the heat sensitive adhesive layer was provided on the front and back of the authenticity identifier and the width was made to be 2 mm by slitting, paper having a thread could be formed by interleaving between the paper layers of the paper.

Specific parts of the pattern of the hologram formed by silk screen printing using different types of water-soluble resin ink (made by Showa Ink Industry Co., Ltd., product name: “Silk Washing Primer No. 4”) In the same manner as in Example 1 except that a pattern of water-soluble resin was formed by printing in a shape excluding, an authenticity identifier was obtained. The obtained authenticity identification object was able to observe a specific part of the pattern of the hologram, and at the place where there was no aluminum, the effect of changing the color depending on the viewing angle was obtained.

  After performing the same process as in Example 1 up to the formation of the fine irregularities of the hologram, an aluminum thin film was uniformly formed by vapor deposition on the entire surface of the fine irregularities formed. An etching resist pattern (made by Showa Ink Industries Co., Ltd.) was printed on the thin film by a gravure printing method in a shape matched with a specific part of the pattern of the formed hologram to form an etching resist pattern. After the formation of the etching resist pattern, etching was performed using a 1% NaOH aqueous solution to remove an unnecessary portion of the aluminum thin film, thereby obtaining an authenticity identifier. The obtained authenticity identification object was able to observe a specific part of the pattern of the hologram, and at the place where there was no aluminum, the effect of changing the color depending on the viewing angle was obtained.

  After forming a cholesteric liquid crystal layer in the same manner as in Example 1, the cholesteric liquid crystal layer was superposed on the cholesteric liquid crystal ink, and printing was performed by gravure printing, followed by drying and UV irradiation. Irradiation was sequentially performed to form a cholesteric liquid crystal pattern layer. 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 ultraviolet polymerization. A 40% toluene solution containing an initiator was used, and the polymerizable nematic liquid crystal / chiral agent in the coating composition was set to 96.3 / 3.7.

  After forming the cholesteric liquid crystal layer and the cholesteric liquid crystal pattern layer, an acrylic resin paint is applied uniformly on the surface opposite to the formation of these layers in the same manner as in Example 1. A resin layer was formed and heat embossed on the surface of the resin layer to form fine irregularities on the hologram.

  Using the water-soluble resin ink (manufactured by Showa Ink Industry Co., Ltd., product name: “Primer for Silk Washing No. 4”) on the surface of the formed fine irregularities, the hologram formed by silk screen printing was used. Print in a shape excluding a specific part of the pattern, form a water-soluble resin pattern, and after printing, uniformly deposit an aluminum thin film on the entire surface of the fine irregularities on which the water-soluble resin pattern is formed by vapor deposition After the formation, the substrate was washed with water, and the aluminum thin film at the portion where the water-soluble resin pattern was formed was removed together with the water-soluble resin pattern to form a pattern made of the aluminum thin film, thereby obtaining an authentic identifier. The obtained authenticity identifier can observe a specific portion of the hologram pattern, and the color changes depending on the viewing angle in a place where there is no aluminum, and the viewing angle in a portion based on the cholesteric liquid crystal pattern layer. Unlike the surrounding cholesteric liquid crystal layer alone, the effect of changing the color caused two types of color changes.

  After forming a cholesteric liquid crystal layer in the same manner as in Example 1, after applying another cholesteric liquid crystal coating composition on the opposite side of the formation of this cholesteric liquid crystal layer Then, drying and ultraviolet irradiation were sequentially performed to form another cholesteric liquid crystal layer. As another composition for coating cholesteric liquid crystal, polymerizable nematic liquid crystal (manufactured by BASF Corp., trade name: “Palio Color LC242”), chiral agent (trade name: BASF Corp., trade name: “Palio Color LC756”) ]) And a 20% toluene solution in which an ultraviolet polymerization initiator was blended, the polymerizable nematic liquid crystal / chiral agent in the coating composition was set to 96.3 / 3.7.

  A uniform resin layer was formed by applying an acrylic resin coating on the later formed cholesteric liquid crystal layer, and fine embossing of the hologram was formed by heat embossing on the surface of the resin layer.

  Thereafter, in the same manner as in Example 4, a pattern made of an aluminum thin film was formed on the surface of the formed fine irregularities through formation of a water-soluble resin pattern, uniform formation of an aluminum thin film, and water washing. Authentic identifier. The obtained authenticity identifier can observe a specific portion of the hologram pattern, and, in a place without aluminum, based on the presence of two cholesteric liquid crystal layers, it has two different colors depending on the viewing angle. It was a change.

It is a figure which shows the basic laminated structure of an authenticity identification body. It is a figure which shows the other laminated structure of an authenticity identification body. It is a figure which shows the pattern of the reflective metal layer of an authenticity identification body. It is a figure which shows the other pattern of the reflective metal layer of an authenticity identification body. It is a figure which shows the process of forming the pattern of a reflective metal layer. It is a figure which shows the other process which forms 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 ... Authentic discriminator 2 ... Transparent base material 3 ... Cholesteric liquid crystal layer 4 ... Hologram formation layer 5 ... Reflective metal layer 6 ... Water-soluble resin pattern 7 ... Resist pattern 11 ... Authenticity discrimination Possible base material 12... Base material (12A; upper base material, 12B; lower base material, 12a; recess)

Claims (8)

  On the non-observation side of the cholesteric liquid crystal layer laminate in which the cholesteric liquid crystal layer is laminated on at least one side of the transparent substrate, a hologram forming layer in which fine irregularities of the hologram are formed on the surface of the transparent resin layer is laminated, A genuine discriminator characterized in that a reflective metal layer is laminated in a pattern on the surface of the hologram forming layer on which fine irregularities are formed.   2. The authenticity identification body according to claim 1, wherein the cholesteric liquid crystal layer laminate is obtained by laminating the cholesteric liquid crystal layer on the observation side of the transparent substrate.   The authentic identifier according to claim 1, wherein the cholesteric liquid crystal layer laminate is obtained by laminating the cholesteric liquid crystal layer on the non-observation side of the transparent substrate.   The authentic identifier according to claim 1, wherein the cholesteric liquid crystal layer laminate is obtained by laminating the cholesteric liquid crystal layer on each of the observation side and the non-observation side of the transparent substrate.   The authenticity identifier according to any one of claims 1 to 4, wherein at least a part of the cholesteric liquid crystal layer has a pattern shape.   A sticking authenticity identifier configured by laminating an adhesive layer on the reflective metal layer side of the authenticity identifier according to claim 1.   The authenticity identification body in any one of Claims 1-5 is the base material which can authenticate authenticity comprised by the said reflective metal layer side being laminated | stacked on another base material. A substrate capable of authenticity identification, wherein the authenticity identification body according to any one of claims 1 to 5 is configured to be visiblely embedded in another substrate.

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