JP4354241B2 - Authenticity determination medium, authenticity determination medium label, authenticity determination medium transfer sheet, authenticity determination sheet, and authenticity determination information recording medium - Google Patents

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 is said to be a luxury brand product, 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 (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 mold 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.

  The above-mentioned problem of the present invention is that the substrate is composed of a smectic liquid crystal or a nematic liquid crystal, a light inversion pattern layer having a property of reversing the rotation direction of incident light, and a portion that is composed of a cholesteric liquid crystal and has reduced orientation It has been found that the problem can be solved by laminating the light selective reflection layer having the above, and based on this, the present invention has been achieved.

1st invention which solves a subject partially forms the light inversion pattern layer which consists of the material which the rotation direction of incident light inverts, and the portion which reduces light selective reflectivity in the observation side of a substrate, and On the light reversal pattern layer and the portion on which the light selective reflectivity is reduced and on the base material on which the light reversal pattern layer and the portion to reduce the light selective reflectivity are not formed, A medium for authenticity determination characterized in that a light selective reflection layer that reflects either right circularly polarized light is formed so that a visible part and an invisible latent image part are generated when observed under natural light. It is about.

According to a second aspect of the present invention, a portion for reducing the light selective reflectivity is partially formed on the observation side of the substrate, and a portion for reducing the light selective reflectivity and a portion for reducing the light selective reflectivity are provided. A light selective reflection layer that reflects either left circularly polarized light or right circularly polarized light of incident light is formed on a substrate that is not formed, and the rotation direction of incident light is further formed on the light selective reflective layer. The present invention relates to a medium for authenticity determination, characterized in that a light reversal pattern layer made of a material that is reversed is partially formed so that a visible portion and a latent image portion that cannot be seen are generated when observed under natural light. Is.

According to a third aspect of the present invention, a portion for reducing the light selective reflectivity is partially formed on the observation side of the transparent substrate, and the light selective reflectivity is lowered on the portion for reducing the light selective reflectivity. A light selective reflection layer that reflects either left circularly polarized light or right circularly polarized light of incident light is formed on the base material on which no part is formed, and is incident on the opposite side of the base material from the observation side. A true / false feature in which a light reversal pattern layer made of a material whose light rotation direction is reversed is partially formed to produce a visible portion and a latent image portion that cannot be seen when observed under natural light. Judgment medium.

In a fourth invention according to any one of the first to third inventions, the material constituting the light selective reflection layer is a cholesteric liquid crystal, and the material constituting the light inversion pattern layer is a smectic liquid crystal or a nematic liquid crystal. The present invention relates to a true / false determination medium characterized by the above.

According to a fifth invention, in any one of the first to fourth inventions, the base material itself has orientation or an orientation film is formed on the observation side of the base material. It is related with the medium for authenticity determination.

A sixth invention is a medium label for authenticity determination, wherein an adhesive layer is further laminated on the side opposite to the observation side of the medium for authenticity determination of any of the first to fifth inventions. It is about.

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

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

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

According to the first to third inventions, in a normal state, a portion where the light selective reflection layer property of the light selective reflection layer is reduced is visible, but the light inversion pattern layer is a latent image, By irradiating right circularly polarized light or left circularly polarized light, (1) the light selective reflection layer and the light selective reflection layer have different reflectivities and are colored in different colors to make the light clearer. The inversion pattern layer 4 becomes invisible, or (2) the light selective reflection layer and the portion where the light selective reflection layer property is deteriorated are both non-reflective and uncolored, and the light inversion The pattern layer 4 can be colored and visualized, and can take one of the above states (1) and (2). Formation of a portion with reduced light selective reflection layer properties and light inversion The pattern layer can be easily formed by printing, for example. Therefore, it is possible to provide a medium for authenticity determination that does not increase the number of manufacturing steps and can easily change the pattern.

According to the fourth invention, in addition to the effects of the first to third inventions, the light selective reflection layer is composed of cholesteric liquid crystal, and the light inversion pattern layer is composed of a smectic liquid crystal layer or a nematic liquid crystal layer. An authenticity determination medium that can be easily formed using a composition containing a cholesteric liquid crystal, a smectic liquid crystal, or a nematic liquid crystal can be provided.

According to the fifth invention, in addition to the effects of any one of the first to fourth inventions, it is possible to provide a medium for authenticity determination in which the orientation of the light selective reflection layer is ensured.

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

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

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

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

  As illustrated in FIG. 1A, the authenticity determination medium 1 of the present invention has an alignment film 3 laminated on the observation side of the substrate 2, the upper surface in the drawing, and incident light is incident on the upper surface of the alignment film 3. Two kinds of patterns, a light inversion pattern layer 4 whose rotation direction is reversed and a low orientation pattern layer 5 that lowers the orientation of the alignment film 3, are laminated, and the upper surfaces of these two kinds of pattern layers 4 and 5 are laminated. The light selective reflection layer 6 is laminated. Since this laminated structure can be produced by sequentially laminating each layer only on one side of the substrate 2, it has the advantage of being easy to produce.

  As illustrated in FIG. 1B, the authenticity determination medium 1 of the present invention has an alignment film 3 laminated on the upper surface of the substrate 2 in the drawing, and a low alignment pattern layer on the upper surface of the alignment film 3. 5, the light selective reflection layer 6, and the light inversion pattern layer 4 may have a laminated structure in which they are laminated in the order of description. In this laminated structure, the low orientation pattern layer 5 is used as a common pattern, and the light selective reflection layer 6 is formed once, and then various patterns are formed as the light inversion pattern layer 4. Has the advantage of being suitable.

  As illustrated in FIG. 1C, 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 drawing, and a low alignment pattern layer is formed on the upper surface of the alignment film 3. 5 and the light selective reflection layer 6 are laminated in this order, and the light inversion pattern layer 4 is laminated on the lower surface of the substrate 2, that is, the surface on which the layers 5 and 6 are not laminated. Also good. This laminated structure is also suitable for forming various patterns as the light inversion pattern layer 4 by using the low orientation pattern layer 5 as a common pattern. Further, in this laminated structure, the light selective reflection layer 6 and the light inversion pattern layer 4 can be formed by eliminating the influence of the component in the composition for forming one layer on the other layer. There are also advantages.

  As in the above three examples, the authenticity determination medium 1 of the present invention is essentially composed of a light selective reflection layer 6 having a portion with reduced light selective reflectivity and a material in which the rotation direction of incident light is reversed. The light inversion pattern layer 4 is preferably laminated with each other, but it is more preferably accompanied by a base material for supporting each of these layers. Specifically, FIG. In the example described with reference to FIG. 1 (b), each layer is laminated on the observation side of the base material 2 that does not necessarily need to be transparent, and has been described with reference to FIG. 1 (c). In the example, each layer is laminated separately on the observation side and the back side of the transparent base material 2. In short, each layer is laminated so as to be visible on the base material 2.

  In the above three examples, the light inversion pattern layer 4 in which the rotation direction of the incident light is reversed is composed of a nematic liquid crystal layer or a smectic liquid crystal layer, and the light selective reflection layer 5 is the left circularly polarized light or the incident light. It is a layer made of a material having light selective reflectivity that reflects any one of right-handed circularly polarized light, for example, a cholesteric liquid crystal layer. The low orientation pattern layer 5 is laminated on a surface having orientation, and reduces the orientation of the orientation surface, that is, the orientation surface, and is made of, for example, a resin film.

  In the above three examples, the base material 2 has shown that which requires another alignment film 3, but when the stretched plastic sheet is used as the base material 2, the surface originally has orientation. The stacking of the alignment film 3 can be omitted. That is, the light selective reflection layer in the present invention is laminated on the orientation surface of the substrate via the low orientation pattern layer regardless of whether or not the orientation film is interposed.

  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.

  The light inversion 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 can be formed, and is formed on the substrate 2 or the alignment film 3 having the orientation itself. As a nematic liquid crystal or smectic liquid crystal, a polymer having a functional group such as an acrylate group introduced therein, and when crosslinked by irradiation with ionizing radiation, the photo-inversion pattern layer 4 having excellent physical and chemical properties due to curing. Can be obtained.

  The low orientation pattern layer 5 may be any layer as long as it lowers the orientation of the orientation plane. The low orientation pattern layer 5 is preferably a resin layer formed by using an appropriate resin solution or dispersion because formation by various printing methods is advantageous for pattern formation.

  When the alignment film 3 is accompanied, the material constituting the low-orientation pattern layer 5 and the material constituting the lower alignment film 3 may be the same or different, but both are composed of the same material, When the low orientation pattern layer 5 is made of a transparent material, the low orientation pattern layer 5 is not visible at all or hardly visible in a normal state. In the case where the light selective reflection layer 6 is laminated on the low orientation pattern layer 5 that does not look like this, when the right circularly polarized light or the left circularly polarized light reflected by the light selective reflective layer 6 is irradiated, the low orientation property is reduced. The presence of the pattern layer 5 has an advantage that a highly transparent pattern can be visually recognized.

  The light inversion pattern layer 4 and the low-orientation pattern layer 5 preferably have a pattern depending on the presence or absence of layers as illustrated in FIGS. 1 (a), 1 (b), and 1 (c). The pattern of the light inversion pattern layer 4 and the pattern of the low orientation pattern layer 5 are preferably different from each other and preferably have no overlapping portion. Due to the problem of position accuracy, some of them may overlap.

  The light selective reflection layer 4 is composed of a cholesteric liquid crystal layer. The cholesteric liquid crystal layer in the aligned state has a property of reflecting only one of left circularly polarized light and right circularly polarized light in incident light. The light selective reflection layer 4 can be formed by applying a solvent solution of cholesteric liquid crystal by various coating methods and drying it. Alternatively, at this time, an ultraviolet polymerizable composition can be formed using a polymerizable cholesteric liquid crystal. The ultraviolet-ray polymerizable composition prepared and obtained can be applied by various coating methods, and after drying, it can be polymerized by irradiation with ultraviolet rays.

  The authenticity determination method will be described with reference to the authenticity determination medium 1 described with reference to FIGS. 1A, 1B, and 1C. As shown in FIG. 2A, the authenticity determination medium 1 of the present invention has a pattern 21 that is the letter “A” formed by the light inversion pattern layer 4 and a tint block 22 formed by the low orientation pattern layer 5. , And a plain portion 23 without any pattern. When this authenticity determination medium 1 is observed under natural light, as shown in FIG. 2A, the pattern 21 is a latent image that cannot be visually recognized, but the tint block 22 formed by the low orientation pattern layer 5, and The plain portion 23 is visible. The copy-forgery-inhibited pattern 22 is preferably clouded when the decrease in orientation is small and has high visibility under natural light. Here, the light selective reflection layer 6 is assumed to reflect right circularly polarized light.

  First, when the right circularly polarizing plate is overlaid on the light selective reflection layer 6, reflection occurs on the plain portion 23, and the plain portion 23 ′ that is colored based on the helical pitch of the cholesteric liquid crystal constituting the light selective reflection layer 6 is formed. give. At this time, since the portion of the tint block 22 is accompanied by the low orientation pattern layer 5, the orientation of the light selective reflection layer 6 is lower than the portion not accompanied by the low orientation pattern layer 5. Therefore, a visualized background pattern 22 ′ is provided in order to be in a reflective and colored state different from the plain portion 23 without any pattern. Further, since no reflection occurs in the portion of the pattern 21 that is the letter “A”, color development does not occur.

  Next, when the left circularly polarizing plate is overlapped except for the right circularly polarizing plate, since the left circularly polarized light is incident on the light selective reflection layer 6 in the background portion 22 and the plain portion 23, no reflection occurs. Coloring does not occur in the portion 22 and the plain portion 23, but reflection occurs in the portion of the pattern 21 that is the letter “A”, so that a colored pattern 21 ″ is given.

  Therefore, the authenticity determination medium 1 of the present invention exhibits different reflectivity by allowing the right circularly polarized light and the left circularly polarized light to be incident separately from each other. Confirm the appearance of authenticity, or enter the right and left circularly polarized light into both authenticity and authenticity and compare the reflectivity or appearance. Thus, authenticity determination can be performed. Note that the observation of the right circularly polarized light or the left circularly polarized light incident on the light selective reflection pattern layer 5 is simply performed by superimposing the right circularly polarizing plate or the left circularly polarizing plate on the light selective reflection pattern layer 5. It may be.

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

  FIG. 3 (a) relates to the form of the label. In the example shown in the figure, the substrate 2, the alignment film 3, the light inversion pattern layer 4, the low alignment pattern layer 5, and the light selective reflection layer 6 are arranged in this order. An authenticity determination medium label 11 is configured by laminating an adhesive layer 12 on the base material 2 side of the authenticity determination medium 1 (the one shown in FIG. 1A) having a laminated structure. The authenticity determination medium 1 for constituting the authenticity determination medium label 11 is not limited to the above-described laminated structure, but has another laminated structure described with reference to FIG. It may have a laminated structure in which the film 3 is omitted.

  In the above description with reference to FIG. 3A, the adhesive layer 12 is laminated on the substrate 2 side, but the adhesive layer may be laminated on the light selective reflection layer 6 side, either side. Whether or not the adhesive layer is laminated depends on whether the substrate 3 side or the light selective reflection layer 6 side becomes the incident surface when labels are applied to various articles. The adhesive layer 12 may be various types of adhesive layers, but is preferably a heat-sensitive adhesive layer or a pressure-sensitive adhesive layer. The same applies when the authenticity determination medium label 11 is formed of the other laminated structure described with reference to FIG.

  FIG. 3B relates to the form of the transfer sheet. In the illustrated example, the substrate 2, the alignment film 3, the light inversion pattern layer 4 and the low alignment pattern layer 5, and the light selective reflection layer 6 are included. An adhesive layer 12 is laminated on the substrate 2 side of the medium for authenticity determination 1 (having the one shown in FIG. 1A) having a laminated structure sequentially laminated, and the peelable substrate 14 is peeled on the light selective reflection layer 6 side. The authenticity determination medium transfer sheet 13 is configured by laminating the property surface 14a side. The authenticity determination medium 1 for constituting the authenticity determination medium transfer sheet 13 is not limited to the above-described laminated structure, but may be another laminated structure described with reference to FIG. It may have a laminated structure in which 3 is omitted.

Also in the case of the authenticity determination medium transfer sheet 12, which side the adhesive layer is laminated on is determined by
When the transfer sheet is applied to various articles, it is determined depending on which of the base material 2 side and the light selective reflection layer 6 side is the incident surface, and the peelable base material 2 is laminated on the side where the adhesive layer is not laminated. . Again, the adhesive layer 12 can be various types of adhesive layers, but is preferably a heat sensitive adhesive layer or a pressure sensitive adhesive layer. The same applies when the authenticity determination medium transfer sheet 13 is formed of the other laminated structure described with reference to FIG. The adhesive layer may be applied to the surface of various articles to which the authenticity determination medium 1 should be applied, and the transfer sheet may be configured without an adhesive layer.

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

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

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

  A TAC film is prepared, and a PVA solution (PVA resin manufactured by Kuraray Co., Ltd., product number: “110”, used as a 2% aqueous solution (transparent)) is applied to the surface and dried, followed by rubbing treatment. An alignment film was formed. On the formed alignment film, a polymerizable nematic liquid crystal solution and a PVA solution (PVA resin manufactured by Kuraray Co., Ltd., product number: “110”, used as a 5% aqueous solution (transparent)) are used, respectively, by gravure printing, Two different patterns consisting of letters and designs were printed. As the polymerizable nematic liquid crystal solution, a 40% solution of a polymerizable nematic liquid crystal (manufactured by BASF Corporation, trade name: “Paliocolor LC242”) and an ultraviolet polymerization initiator (the solvents are toluene and cyclohexanone) The part printed using the polymerizable nematic liquid crystal solution was cured by printing and then drying and then irradiating with ultraviolet rays.

  Gravure coating is performed on the inversion layer on the two formed patterns using a polymerizable cholesteric liquid crystal solution, dried, and then irradiated with ultraviolet rays to form a cholesteric liquid crystal layer for authenticity determination. A medium was obtained. The polymerizable cholesteric liquid crystal solution used here is a polymerizable nematic liquid crystal (BASF Corporation, trade name: “Palio Color LC242”), a chiral agent (BASF Corporation, trade name: “Palio Color LC756”). ) And an ultraviolet polymerization initiator are blended in a 15% solution (the solvent is toluene). Among these, the blending ratio of the polymerizable nematic liquid crystal / chiral agent is 95.5 / 4.5. A polymerization initiator mix | blends 5% with respect to polymeric nematic liquid crystal. The formed cholesteric liquid crystal layer reflects right circularly polarized light.

  Printing prior to the formation of the cholesteric liquid crystal layer was performed using only the PVA solution, and after the formation of the cholesteric liquid crystal layer, printing was performed again using the polymerizable nematic liquid crystal solution, thus changing the order of forming the layers. Except for the above, a medium for authenticity determination was obtained according to the same materials and methods as in Example 1.

  Prepare a PET film, perform printing using a PVA solution on one side and formation of a cholesteric liquid crystal layer in order without forming an alignment film, and a polymerizable nematic liquid crystal solution on the other side of the PET film. A medium for authenticity determination was obtained according to the same material and method as in Example 1 except that the printing used was performed and two types of printing were separately performed on both sides of the substrate in this way.

  When the right circularly polarizing plate is superimposed on the side having the light selective reflection layer of the medium for authenticity determination obtained in Example 1 to Example 3, the portion printed with the PVA solution is printed by reflection of the cholesteric liquid crystal layer. The pattern was visually recognizable due to the difference in color from the unexposed portion, and the portion printed using the polymerizable nematic liquid crystal solution was not visually recognized. Next, when the right circularly polarizing plate was removed and the left circularly polarizing plate was overlapped, the portion printed with the PVA solution was not visible, but the pattern due to the reflection of the portion printed using the polymerizable nematic liquid crystal solution was visually recognized. As described above, it was possible to determine the authenticity by using the right circularly polarizing plate and the left circularly polarizing plate.

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

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Medium for authenticity determination 2 ... Base material 3 ... Orientation film 4 ... Light inversion pattern layer 5 ... Orientation suppression pattern layer 6 ... Light selective reflection layer 11 ... Medium label for authenticity determination 13 ... ... medium transfer sheet 15 for authenticity determination ... information recording medium 18 capable of authenticity determination ... sheet 41 capable of authenticity determination ... pattern 51 ... tint block

Claims (9)

A light reversal pattern layer made of a material that reverses the rotation direction of incident light and a portion that reduces light selective reflectivity are partially formed on the observation side of the substrate, and the light reversal pattern layer and light selective reflectivity are further formed. Reflecting either left-handed circularly polarized light or right-handed circularly polarized light of the incident light on the part that lowers the light reversal and on the base material on which the light inversion pattern layer and the part that lowers the light selective reflectivity are not formed An authenticity determination medium characterized in that a light selective reflection layer is formed so that a visible portion and a latent image portion that cannot be seen are generated when observed under natural light. A base material in which a portion for reducing light selective reflectivity is partially formed on the observation side of the base material, and a portion for reducing the light selective reflectivity and a portion for reducing the light selective reflectivity are not formed. A light selective reflection layer that reflects either left circularly polarized light or right circularly polarized light of incident light is formed on the light selective reflection layer, and the light selective reflection layer is made of a material that reverses the rotation direction of the incident light. An authenticity determination medium characterized in that a light reversal pattern layer is partially formed so that a visible portion and a latent image portion that cannot be seen are generated when observed under natural light. On the observation side of the transparent substrate, a part that reduces the light selective reflectivity is partially formed, and the part that reduces the light selective reflectivity and the part that reduces the light selective reflectivity are not formed. A light selective reflection layer that reflects either left circularly polarized light or right circularly polarized light of incident light is formed on the substrate, and the rotation direction of the incident light is reversed on the opposite side of the substrate from the observation side. A medium for authenticity determination, in which a light reversal pattern layer made of a material to be formed is partially formed so that a visible portion and a latent image portion that cannot be seen are generated when observed under natural light. Billing material constituting the light selective reflection layer is a cholesteric liquid crystal, any one of claims 1 to 3 material constituting the light reversed pattern layer is characterized in that it is a smectic liquid crystal or nematic liquid crystal The medium for authenticity determination described in the item . The trueness of any one of claims 1 to 4, wherein the base material itself has orientation or an orientation film formed on the observation side of the base material. False judgment medium. Authenticity determination medium label, characterized by further adhesive layer on the opposite side is laminated with observation side authenticity determination medium of any one of claims of claims 1 to claim 5. Claims 1 to 6 any one of claims authenticity determination medium transfer sheet authenticity determination medium is characterized in that it is laminated on the release of surface of a release substrate according. The authenticity determination medium of claim of claims 1 to claim 6 or 1, authenticity determination can be sheet, characterized in that it comprises enabling visible part of the sheet. Authenticity determination medium of claim of claims 1 to claim 6 or 1, or is laminated on the surface of the information recording medium is authenticity determination target, or visible possible part of the information recording medium An information recording body capable of determining authenticity.

Images