JP2005091786A - Medium for judging authenticity, medium label for judging authenticity, medium transfer sheet for judging authenticity, sheet capable of judging authenticity and information recording body capable of judging authenticity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium for judging 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 for judging authenticity because many stages are required at the time of manufacturing an embossing mold in the case of forming the decision part by embossed hologram. <P>SOLUTION: Authenticity judgement using a polarizing plate is realized by structure where oriented film 3 and a pattern layer 4 whose incident light rotating direction is rotated are laminated on a base material 2, and a hologram forming layer 5 and a reflective layer 6 are laminated on the lower side of the base material 2 or by laminating the oriented film 3, the pattern layer 4, the hologram forming layer 5 and the reflective layer 6 on the base material 2 in this order. It is good to use a mere light reflection layer 7 instead of the hologram forming layer 5 and the reflective layer 6. <P>COPYRIGHT: (C)2005,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-mentioned problems of the present invention can be solved by forming, on the reflective layer, a layer composed of, for example, smectic liquid crystal or nematic liquid crystal and having the property of reversing the rotation direction of incident light in a pattern. Therefore, the present invention was able to be reached based on this.

  A first invention for solving the problem is characterized in that a pattern layer in which the rotation direction of incident light is reversed and a light reflection layer arranged on the non-observation side of the pattern layer are visibly laminated on a substrate. It is related with the medium for authenticity determination.

  According to a second aspect of the present invention, there is provided the authenticity determination medium according to the first aspect of the invention, wherein the pattern layer in which the rotation direction of the incident light is reversed is composed of a smectic liquid crystal or a nematic liquid crystal. .

  A third invention is the first or second invention, wherein the substrate is transparent, the pattern layer is laminated on the observation side of the substrate, and a light reflection layer is laminated on the non-observation side of the substrate. The present invention relates to a medium for authenticity determination.

  A fourth invention is characterized in that, in the first or second invention, the base material is transparent, and the pattern layer and the light reflection layer are laminated in this order on the non-observation side of the base material. The present invention relates to an authenticity determination medium.

  A fifth invention relates to a medium for authenticity determination according to the first or second invention, wherein the light reflection layer and the pattern layer are laminated in this order on the observation side of the substrate. It is.

  A sixth invention relates to the medium for authenticity determination according to any one of the first to fifth inventions, wherein the light reflecting layer is made of a light reflecting metal.

  A seventh invention relates to a medium for authenticity determination according to any one of the first to fifth inventions, wherein the light reflecting layer is a reflection hologram.

  The eighth invention relates to a medium label for authenticity determination, wherein an adhesive layer is further laminated on the medium for authenticity determination of any of the first to seventh inventions.

  A ninth invention relates to a medium transfer sheet for authenticity determination, wherein the authenticity determination medium of any one of the first to seventh inventions is laminated on a peelable surface of a peelable substrate. is there.

  A tenth invention relates to a sheet capable of authenticity determination, characterized in that the medium for authenticity determination according to any one of the first to seventh inventions is visible in a part of the sheet.

  In an eleventh aspect of the invention, the authenticity determination medium according to any one of the first to seventh aspects 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, since the pattern layer that is a latent image in a normal state is visualized by overlapping the polarizing plates, and reflection of light in the background can be obtained in any case, the authenticity determination The formation of the pattern layer can be easily performed by, for example, printing, etc., and therefore, it is possible to provide a medium for authenticity determination that does not increase the number of manufacturing steps and can easily pattern polarization. Can do.

  According to the second invention, in addition to the effect of the invention of claim 1, since the pattern layer is specifically composed of a smectic liquid crystal layer or a nematic liquid crystal layer, a composition containing a smectic liquid crystal or a nematic liquid crystal is used. It is possible to provide a medium for authenticity determination that can be easily formed.

  According to the third invention, in addition to the effect of the invention of claim 1 or 2, the pattern layer and the light reflecting layer are laminated with the base material interposed therebetween. An authenticity determination medium that can be manufactured with less influence on each other can be provided.

  According to the fourth invention, in addition to the effect of the invention of claim 1 or 2, the pattern layer and the light reflecting layer are laminated with the base material interposed therebetween. An authenticity determination medium that can be manufactured with less influence on each other can be provided.

  According to the fifth aspect of the invention, in addition to the effect of the first or second aspect of the invention, the light reflecting layer and the pattern layer are laminated on the same side on the substrate, so that the visibility of each layer is high. A medium for authenticity determination can be provided.

  According to the sixth invention, in addition to the effects of any one of the first to fifth inventions, since the light reflecting layer is composed of the light reflecting metal layer, a medium for determining authenticity with good light reflecting property is provided. can do.

  According to the seventh invention, in addition to the effects of any one of the first to fifth inventions, since the light reflecting layer is formed of a reflection hologram, the authenticity is such that it has light reflectivity and the hologram image can be visually recognized. A determination medium can be provided.

  According to the eighth 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 seventh inventions. Can be provided.

  According to the ninth aspect, since the authenticity determination medium capable of exhibiting the effects of any of the first to seventh 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 tenth invention, since the authenticity determination medium according to any one of the first to seventh inventions is applied, the authenticity determination sheet that enables the authenticity determination of the added information is provided. Can be provided.

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

  As illustrated in FIG. 1A, in the authenticity determination medium 1 of the present invention, an alignment film 3 is laminated on the upper surface of the substrate 2 in the figure, and the rotation direction of incident light is on the alignment film 3. A pattern layer 4 to be inverted is laminated, and a hologram forming layer 5 is laminated on the lower surface of the substrate 2 in the figure, and the hologram forming layer 5 has fine irregularities of the hologram on the lower surface side. The reflective layer 6 is further laminated along the fine irregularities. This structure can be manufactured by separately forming the pattern by the pattern layer 4 and the hologram on both sides of the substrate 2, and the formation can be performed without affecting each other. There are few advantages.

  As illustrated in FIG. 1B, the authenticity determination medium 1 of the present invention includes an alignment film 3, a pattern layer 4 in which the rotation direction of incident light is reversed, and a lower surface side of the substrate 2. The hologram forming layer 5 having the fine unevenness of the hologram and the reflective layer 6 along the fine unevenness may be laminated in the order described. Since each layer is laminated | stacked only on the one side of the base material 2, there exists an advantage which can utilize the exposed base material 2 as a protective layer.

  In any of the examples described with reference to FIG. 1A and FIG. 1B, the pattern layer 4 in which the rotation direction of incident light is reversed is composed of a nematic liquid crystal layer or a smectic liquid crystal layer, The base material 2, the alignment film 3, the pattern layer 4, and the hologram forming layer 5 are transparent. Here, having transparency includes a case where it is colored. Further, the reflective layer 6 along the fine irregularities of the hologram is a transparent layer having a refractive index different from that of the reflective metal thin film or the hologram forming layer 5 as described later.

  In any of the examples described with reference to FIG. 1 (a) and FIG. 1 (b), the hologram forming layer 5 and the reflective layer 6 along the fine irregularities of the hologram provide a reflective hologram, The side of the authenticity determination medium 1 opposite to the hologram side, that is, the pattern layer 4 side in the example described with reference to FIG. 1A and the base in the example described with reference to FIG. When viewed from the material 2 side, a hologram image can be seen, and the authenticity determination medium 1 is made light reflective. In the present invention, the hologram provided by the hologram forming layer 5 and the reflective layer 6 can itself be a means for determining authenticity. However, in the present invention, the pattern in which the rotation direction of the added incident light is further reversed. Since the layer 4 serves as a more direct means of authenticity determination, the accuracy of forming each layer that provides the hologram may be such that the hologram can be seen. Therefore, no special consideration is required to improve the accuracy.

  In order to make the authenticity determination medium 1 light reflective, a simpler light reflective layer may be laminated instead of the reflective hologram laminated on the lower surface side. Figures 2 (a), (b) and (c) show some examples of such.

  As illustrated in FIG. 2A, in the authenticity determination medium 1 of the present invention, an alignment film 3 is laminated on the upper surface of the substrate 2 in the figure, and the rotation direction of incident light is aligned on the alignment film 3. The pattern layer 4 which inverts is laminated | stacked, and the light reflection layer 7 may be laminated | stacked on the lower surface in the figure of the base material 2. FIG. Further, as illustrated in FIG. 2B, the authenticity determination medium 1 of the present invention has an alignment film 3 and a pattern layer 4 in which the rotation direction of incident light is reversed on the lower surface of the substrate 2 in the drawing. In addition, the light reflection layer 7 may be laminated. Further, in the authenticity determination medium 1 of the present invention, the light reflecting layer 7, the alignment film 3, and the pattern layer 4 in which the rotation direction of incident light is reversed are laminated on the upper surface of the base material 2 in the order described. It may be. The example illustrated in FIG. 2A has the same advantages as those illustrated in FIG. 1A, and the example illustrated in FIG. 2B is the same as that illustrated in FIG. Have the advantages. In addition, what was illustrated in FIG.2 (c) is the application surface to a target object in the side where nothing is laminated | stacked of the base material 2, and both the light reflection layer 7 and a pattern layer are the observation surface side of the base material 2. Therefore, it has an advantage of very high visibility.

  The light reflection layer 7 in the example described with reference to FIGS. 2A, 2B, and 2C will be described later. As described later, the light reflection layer 7 in the reflective metal thin film or the authenticity determination medium 1 is used. 7 is composed of a transparent layer having a light refractive index different from that of the layer other than 7 and, in particular, a light refractive index different from that of the pattern layer. After all, these are fine irregularities of the hologram forming layer 5 in the example described above. It can be made of the same material as the reflective layer 6 along. The light reflecting layer 7 may be a uniform and uniform layer of the above materials, but may be formed as a pattern layer depending on the presence or absence of these materials. In addition, if necessary, the light reflecting layer 7 is laminated via a transparent resin layer, and an uneven surface having a pitch larger than the fine uneven surface of the relief hologram is formed on the lower surface of the transparent resin layer to form a light reflective uneven pattern. It may be formed.

  In the examples described with reference to FIG. 1 and FIG. 2, both of them show 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 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 processing when manufacturing the medium for mechanical strength and authenticity determination. 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. In the example described with reference to FIG. 2C, the alignment film 3 may be laminated on the surface of the light reflecting layer 7 opposite to the base 2.

  The pattern layer 4 is composed of nematic liquid crystal or smectic liquid crystal, and is formed by various printing methods using an ink composition containing these liquid crystals, preferably an ink composition comprising a solvent solution of these liquid crystals. It forms a transparent pattern formed on the substrate 2 or the alignment film 3 having orientation. When a functional group such as an acrylate group is introduced as a nematic liquid crystal or a smectic liquid crystal and is crosslinked by irradiation with ionizing radiation or the like, the patterned layer 4 having excellent physical and chemical properties due to curing can be obtained.

  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.

  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 refractive index different from that of the hologram forming layer 5. Is an opaque hologram, and when the latter is used, a transparent hologram is obtained. In either case, a reflection hologram is obtained by illumination from the observer side.

  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 this 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 5 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 light reflecting layer 7 in the example described with reference to FIGS. 2A, 2B, and 2C is also a reflective metal thin film layer or hologram forming layer similar to the reflective layer 6 described above. It can be composed of a resin material and a transparent material layer having a different refractive index of light.

  The authenticity determination method will be described using the authenticity determination medium 1 described with reference to FIG. 1 as an example. First, when the authenticity determination medium 1 of the present invention is observed under natural light, as shown schematically in FIG. 3A, light is reflected by the reflective layer 6 to form fine irregularities on the lower surface of the hologram forming layer 5. The recorded hologram 8 can be seen. At this time, since the pattern layer 4 is transparent, the pattern (here, the letter “A”) 9 is a latent image and is not visible at all. It looks very unclear. Therefore, it is recognized as a simple hologram 8 as a whole.

  Next, when the polarizing plate is superimposed on the authenticity determination medium 1, the pattern layer 4 appears bright because the direction of rotation of the incident light is reversed and reflection occurs. give. In portions other than the pattern 9 ′, the hologram 8 is still visible although it is slightly darkened by overlapping the polarizing plates. As a result, the letter “A” can be seen on the hologram 8 as a background.

  Further, in the case of the authenticity determination medium 1 described with reference to FIG. 2, under the natural light, only the color of the light reflecting layer 7 can be seen based on the reflection of the light reflecting layer 7, but the polarizing plates are overlapped. Then, with the background of the color of the light reflection layer 7, the pattern of the pattern layer 4 can be seen.

  The authenticity determination medium 1 of the present invention described with reference to FIG. 1 and FIG. 2 is processed into a label or transfer sheet form as described below with reference to FIG. Application to various articles to which the medium 1 is applied can be facilitated.

  FIG. 4A relates to the form of the label. In the example shown in the figure, the light reflection layer 7 of the authenticity determination medium 1 having a laminated structure of the base material 2, the pattern layer 4, and the light reflection layer 7 is shown. An adhesive layer 11 is laminated on the side to constitute the authenticity determination medium label 10. The authenticity determination medium 1 for constituting the authenticity determination medium label 11 is not limited to the above-described laminated structure, but various laminated structures described with reference to FIG. 1 or FIG. It may have a laminated structure in which the alignment film 3 is omitted.

  Further, in the above description referring to FIG. 4A, the adhesive layer 11 is laminated on the light reflecting layer 7, but the adhesive layer 11 is used for authenticity determination described referring to FIG. 1 or FIG. The medium 1 is preferably laminated on the lower surface side in the drawing.

  FIG. 4B relates to the form of the transfer sheet. The example shown in the figure is a light reflection layer of the authenticity determination medium 1 having a laminated structure of the base material 2, the pattern layer 4, and the light reflection layer 7. The authenticity determination medium transfer sheet 12 is configured by laminating the adhesive layer 11 on the 7 side and laminating the peelable surface 13a of the peelable substrate 13 on the substrate 2 side. The authenticity determination medium 1 for constituting the authenticity determination medium transfer sheet 12 is not limited to the laminated structure described above, but various laminated structures described with reference to FIG. 1 or FIG. It may have a laminated structure in which the alignment film 3 is omitted.

  Also in the case of the authenticity determination medium transfer sheet 12, the adhesive layer 11 is preferably laminated on the lower surface side of the authenticity determination medium 1 described with reference to FIG. 1 or FIG.

  The authenticity determination medium 1 of the present invention is preferably a variety of articles using the authenticity determination medium label 10 or the authenticity determination medium transfer sheet 12 as described above. Can be applied to. The authenticity determination medium label 10 is applied by attaching the adhesive layer 11 toward the article to be adhered, and the authenticity determination medium transfer sheet 12 is used. Then, after the adhesive layer 11 is adhered toward the article serving as the adherend, it is applied by peeling the peelable substrate 13.

  FIG. 5 is a diagram for explaining application of the authenticity determination medium 1 mainly for a sheet-like object. What is shown in FIG. 5 (a) is an information recording body 14 capable of determining authenticity, in which the authenticity determination medium 1 is laminated on a part of the surface of the information recording body 15. The information recording body 15 is a sheet-like material whose base material is paper, plastic sheet or the like. In the example shown in the figure, information 16 such as an amount for use as a cash voucher, characters such as issuing company name, cautionary notes, or coloring pattern. Is formed and recorded by means such as printing.

  In FIG. 5B, the authenticity determination medium 1 is built in a sheet-like material in advance so as to be visible, and is a recessed opening that does not become a through-hole in paper or a plastic sheet. 18 is configured so that the authenticity determination medium 1 can be seen from the opening 18, 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 18 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. 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 enhancing the visibility during polarized light irradiation, if necessary, and is incorporated in a sheet-like material. In order to ensure adhesion between the thread-like authenticity determination medium 1 and the sheet-like material in the state, an adhesive layer, preferably a heat-sensitive adhesive layer, is preferably 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.

  A PET film was prepared, and gravure printing was performed on the surface thereof using a polymerizable nematic liquid crystal ink, followed by drying, and irradiation with ultraviolet rays was performed to form letters and designs to obtain a printed film. The polymerizable nematic liquid crystal ink used here is a 40% toluene solution in which a polymerizable nematic liquid crystal (manufactured by BASF Corporation, trade name: “Paliocolor LC242”) and an ultraviolet polymerization initiator are blended. Among them, the ultraviolet polymerization initiator is a blend of 5% with respect to the polymerizable 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 aluminum is vacuum-deposited on the surface of the relief hologram to form a reflective layer made of an aluminum thin film having a thickness of 200 nm. Thus, a medium for authenticity determination was obtained.

  When the obtained authenticity determination medium is viewed from the printing surface side, since the printed characters and designs are transparent, they cannot be seen, and only the image of the hologram formed on the lower surface side can be seen. When the polarizing plates are overlapped, the printed characters and designs appear to be colored against the background of the hologram image, so that the authenticity can be determined.

  A true / false determination medium was obtained in the same manner as in Example 1 except that the relief hologram and the reflective layer were formed on the surface on which the printing film was printed.

  When the obtained authenticity determination medium is viewed from the PET film side, only the hologram image can be seen as in the case of Example 1, and when the polarizing plate is overlaid, the hologram image is printed against the background. Since the characters and designs appear to be colored, it was possible to determine authenticity.

  After preparing a PET film and vacuum-depositing aluminum on the surface to form a light reflecting layer composed of an aluminum thin film having a thickness of 200 nm, a PVA solution (PVA resin manufactured by Kuraray Co., Ltd., product number; 110 ", used as a 5% aqueous solution (transparent)) and dried, followed by rubbing to form an alignment film. On the formed alignment film, gravure printing is performed using a polymerizable nematic liquid crystal ink in the same manner as in Example 1, dried, and then irradiated with ultraviolet rays to form characters and designs. A medium for authenticity determination was obtained.

  When the obtained authenticity determination medium is viewed from the printing surface side, the printed characters and designs are transparent, so they cannot be seen, and only the metal color of the aluminum thin film is visible, but the polarizing plate is overlaid. With the background of the metal color of the aluminum thin film, the printed characters and designs appear to be colored, so that the authenticity can be determined.

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 other 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 ... Pattern layer 6 ... Reflective layer 7 ... Light reflection layer 8 ... Hologram 9 ... Pattern 10 ... For authenticity determination Media label 11 ... adhesive layer 12 ... medium transfer sheet 13 for authenticity determination ... peelable substrate (13a; peelable surface)
14 ... Information recording body 15 capable of authenticity determination ... Information recording body 16 ... Information 17 ... Sheet 18 capable of authenticity determination ... Opening

Claims (11)

  A medium for authenticity determination, wherein a pattern layer in which the rotation direction of incident light is reversed and a light reflection layer disposed on the non-observation side of the pattern layer are visibly laminated on a substrate.   2. The medium for authenticity determination according to claim 1, wherein the pattern layer in which the rotation direction of the incident light is reversed is composed of a smectic liquid crystal or a nematic liquid crystal.   The said base material is transparent, the said pattern layer is laminated | stacked on the observation side of the said base material, and the light reflection layer is laminated | stacked on the non-observation side of the said base material. The medium for authenticity determination.   3. The authenticity determination medium according to claim 1, wherein the base material is transparent, and the pattern layer and the light reflection layer are laminated in this order on the non-observation side of the base material. .   The medium for authenticity determination according to claim 1 or 2, wherein the light reflection layer and the pattern layer are laminated in this order on the observation side of the substrate.   6. The authenticity determination medium according to claim 1, wherein the light reflection layer is made of a light reflective metal.   The authenticity determination medium according to any one of claims 1 to 5, wherein the light reflection layer is a reflection hologram. A medium label for authenticity determination, wherein an adhesive layer is further laminated on the medium for authenticity determination according to any one of claims 1 to 7. An authenticity determination medium transfer sheet, wherein the authenticity determination medium according to claim 1 is laminated on a releasable surface of a releasable substrate. A sheet capable of authenticity determination, comprising the medium for authenticity determination according to any one of claims 1 to 7 so as to be visible in a part of the sheet. The authenticity determination medium according to any one of claims 1 to 7 is laminated on a surface of an information recording body that is an object of authenticity determination, or is visible on a part of the information recording body. An information recording medium that can determine whether the feature is true or false.

Images