JP4515065B2 - 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 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 (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 capable of solving

The object of the present invention is to provide a light selective reflection pattern layer composed of cholesteric liquid crystal, a layer thickness or a helical pitch of liquid crystal, and composed of cholesteric liquid crystals of different colors, and the light selective reflection pattern as viewed from the observation side. It was found that a light selective reflection layer formed so as to cover the layer and a light inversion pattern layer composed of nematic liquid crystal or the like can be solved by laminating on a substrate, and based on this, the present invention Was able to reach.

In a first invention for solving the problem, the first light selective reflection layer made of cholesteric liquid crystal having a light selective reflection property for reflecting either the left circularly polarized light or the right circularly polarized light in the incident light has a pattern shape. light selective reflecting pattern layer is formed as viewed from the observation side covering the light selective reflecting pattern layer, wherein the first light selective reflecting layer different in thickness or helical pitch of the liquid crystal layer, the color of the A second light selective reflection layer made of different cholesteric liquid crystal and a light inversion pattern layer in which a light inversion layer made of nematic liquid crystal or smectic liquid crystal in which the rotation direction of incident light is reversed are laminated on a substrate. The present invention relates to a medium for authenticity determination characterized by the above.

According to a second invention, in the first invention, the base material is transparent, the second light selective reflection layer on the observation side of the base material, and the light selective reflection pattern layer on the back side of the base material. The present invention relates to a medium for authenticity determination characterized by being laminated.

The third invention is the first or second aspect of the invention, the light reversed pattern layer, the viewing side of the second light selective reflection layer, the second between the light selective reflecting layer the substrate or, The present invention relates to a medium for authenticity determination, which is laminated on the back side of the base material.

In a fourth invention, the present invention relates to a medium label for authenticity determination, wherein an adhesive layer is further laminated on the medium for authenticity determination of any one of the first to third inventions.

5th invention is related with the medium transfer sheet for authenticity determination characterized by the fact that the authenticity determination medium of any one of the 1st- 3rd invention is laminated | stacked on the peelable surface of the peelable base material. is there.

6th invention has the medium for authenticity determination of any one of the 1st- 3rd invention so that it can be visually recognized in a part of sheet | seat, The sheet | seat which can authenticate authenticity characterized by the above-mentioned.

In the seventh invention, the authenticity determination medium according to any one of the first to third inventions is laminated on the surface of the information recording body which is the object of authenticity determination, 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 second light selective reflection layer and the light selective reflecting pattern layer is composed of cholesteric liquid crystal, but is visible under normal conditions, the on light selective reflecting pattern layer 2 by light selective reflection layer of a laminated structure are laminated, under normal illumination, the light selective reflecting pattern layer is less visible, the light reverse pattern layer is composed of a nematic liquid crystal or smectic liquid crystal, usually In this state, it is a latent image. By irradiating right circularly polarized light or left circularly polarized light, either the light selective reflection layer and the light selective reflection pattern layer or the light inversion pattern layer is visualized, and the light selection The reflective pattern layer and the light inversion pattern layer can be easily formed by, for example, printing, so that the number of manufacturing steps is not increased and the pattern can be easily changed. It is possible to provide a determination medium.

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

According to the third invention, in addition to the effects of the first or second invention, there is provided an authenticity determination medium capable of determining the lamination position of the light inversion pattern layer without depending on the lamination structure of other layers. Can be provided.

According to the fourth 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 that can exert the effects of any of the first to third inventions. Can be provided.

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

According to the seventh invention, since the authenticity determination medium according to any one of the first to third 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 base material 2, the upper surface in the drawing, and incident light is incident on the upper surface of the alignment film 3. The light reversal pattern layer 5 in which the rotation direction of the light is reversed, and the light selective reflection pattern layer 4 in which a layer having light selective reflectivity that reflects either left circularly polarized light or right circularly polarized light in the incident light is formed into a pattern. The two types of pattern layers 5 and 4 are laminated, and a light selective reflection layer 6 having a light selective reflectivity and different from the light selective reflection pattern layer 4 is laminated on the upper surfaces of the two types of pattern layers 5 and 4. It has a laminated structure. 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. In addition, the layered structure in which the light selective reflection layer is laminated on the light selective reflection pattern layer 4 as described above also has an advantage that the light selective reflection pattern layer 4 is difficult to see under normal illumination.

  As illustrated in FIG. 1B, 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 light selective reflection pattern layer is formed on the upper surface of the alignment film 3. 4. The light selective reflection layer 6 and the light inversion pattern layer 5 may have a laminated structure in which they are laminated in the order of description. In this laminated structure, the light selective reflection pattern layer 4 is used as a common pattern, and once the light selective reflection layer 6 is formed, various patterns are formed as the inversion pattern layer 5 after that. 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 light selective reflection pattern layer is formed on the upper surface of the alignment film 3. 4 and the light selective reflection layer 6 are laminated in the order of description, and the substrate 2 has a laminated structure in which the reverse pattern layer 5 is laminated on the lower surface in the drawing, that is, the surface on which the layers 4 and 6 are not laminated. There may be. This laminated structure is also suitable for forming various patterns as the light inversion pattern layer 5 with the light selective reflection pattern layer 4 as a common pattern. In addition, the stacked structure has an advantage that the formation of the light inversion pattern layer 5 and the formation of the light selective reflection pattern layer 4 and the light selective reflection layer 6 can be performed without affecting each other.

  In each example described with reference to FIGS. 1A, 1B, and 1C, the base material 2, the alignment film 3, the light selective reflection pattern layer 4, and the light selective reflection layer 6 are arranged in this order. (1) The upper surface of the alignment film 3, that is, between the alignment film 3 and the light selective reflection layer 6, (2) the upper surface of the light selective reflection layer 6, or (3) the lower surface of the substrate 2. The light inversion pattern layer 5 is laminated on any of the above. In the authenticity determination medium 1 of the present invention, the light selective reflection pattern layer 4 and the light selective reflection layer 6 may have a laminated structure other than the above with respect to the base material 2 and the alignment film 3. Even in such a case, the light inversion pattern layer 5 is laminated on either (1) the upper surface of the alignment film 3, (2) the upper surface of the light selective reflection layer 6, or (3) the lower surface of the substrate 2.

  2A, 2B, and 2C, the authenticity determination medium 1 of the present invention includes a base material 2, an alignment film 3, a light selective reflection pattern layer 4, and a light selective reflection layer 6. Each of the layers may have a laminated structure described in this order. The light inversion pattern layer 5 is (1) the upper surface of the alignment film 3, that is, between the alignment film 3 and the light selective reflection layer 6 (see FIG. 2 (a)), (2) laminated on either the upper surface of the light selective reflection layer 6 (FIG. 2B) or (3) the lower surface of the substrate 2 (FIG. 2C).

  3A, 3B, and 3C, the authenticity determination medium 1 of the present invention includes an alignment film 3 and a light selective reflection layer 6 on the upper surface of the substrate 2. It may be described in this order, and may have a laminated structure in which the light selective reflection pattern layer 4 is laminated on the lower surface of the substrate 2, and in this case, the light inversion pattern layer 5 also includes (1) the alignment film 3. The upper surface, that is, between the alignment film 3 and the light selective reflection layer 6 (FIG. 3A), (2) the upper surface of the light selective reflection layer 6 (FIG. 3B), or (3) the lower surface of the substrate 2 (FIG. 3C) is laminated.

  The authenticity determination medium 1 of the present invention is essentially a light selective reflection in which a layer having a light selective reflectivity that reflects either left circularly polarized light or right circularly polarized light in incident light is patterned. The pattern layer 4 and the light selective reflection layer 6 different from the layer 4 and the light reversal pattern layer 5 in which the rotation direction of incident light is reversed may be laminated to each other. More preferably, it is accompanied by a base material 2 for supporting. Here, it is whether or not the base material 2 is transparent, but as described with reference to FIGS. 1A and 1B and FIGS. 2A and 2B, one side of the base material 2 When each layer is laminated, the base material 2 does not necessarily need to be transparent. However, in the case of the laminated structure described with reference to the drawings other than these, each layer comprises the base material 2. In order to make all the layers visible from one side, it is preferable to use a transparent substrate 2 so that each layer is visibly laminated on the substrate 2 after all. It is preferable.

  In each of the above examples, the light selective reflection pattern layer 4 and the light selective reflection layer 6 are layers made of a material having light selective reflectivity that reflects either left circularly polarized light or right circularly polarized light in incident light. For example, it is preferably composed of a cholesteric liquid crystal layer, and the layer 4 and the layer 6 preferably have different layer thicknesses or different helical pitches of the liquid crystal and different colors. The light inversion pattern layer 5 is composed of a nematic liquid crystal layer or a smectic liquid crystal layer, and both are transparent layers.

  In each of the above examples, the base material 2 has been shown to require another alignment film 3. However, when the stretched plastic sheet is used as the base material 2, the surface originally has orientation. Therefore, 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.

  The light selective reflection pattern layer 4 is composed of a cholesteric liquid crystal layer. The cholesteric liquid crystal layer in the aligned state has a property of reflecting only one of left circularly polarized light and right circularly polarized light in incident light. The light selective reflection pattern layer 4 can be formed by applying a solvent solution of cholesteric liquid crystal by various printing methods and drying, or, at this time, an ultraviolet polymerizable composition using a polymerizable cholesteric liquid crystal. It is also possible to apply the obtained ultraviolet polymerizable composition by various printing methods, and after drying, polymerize by irradiation with ultraviolet rays.

  The light inversion pattern layer 5 is composed of nematic liquid crystal or smectic liquid crystal, and is formed by various printing methods using ink compositions containing these liquid crystals, preferably ink compositions comprising solvent solutions of these liquid crystals. It can be formed and is laminated on the base material 2, the alignment film 3, or the light selective reflection layer 6, which has orientation.

  The light selective reflection layer 6 is also formed of a cholesteric liquid crystal layer like the light selective reflection pattern layer 4 and can be formed by applying a solvent solution of cholesteric liquid crystal by various coating methods and drying. It is also possible to prepare an ultraviolet polymerizable composition using a polymerizable cholesteric liquid crystal, apply the obtained ultraviolet polymerizable composition by various coating methods, and after drying, polymerize by irradiation with ultraviolet rays. it can. The light selective reflection pattern layer 4 and the light selective reflection layer 6 are preferably configured so that the thicknesses of the layers are different or those having different spiral pitches. Even when both of them reflect light, the visibility of the pattern of the light selective reflection pattern layer 4 increases due to the difference in hue.

  A method of authenticity determination performed using the authenticity determination medium 1 described with reference to FIGS. 1 to 3 will be described. As shown in FIG. 4A, the authenticity determination medium 1 of the present invention includes a pattern 21 that is the letter “A” formed by the light inversion pattern layer 5 and a tint block 22 formed by the light selective reflection pattern layer 4. And the plain portion 23 having no pattern, and the plain portion 23 is composed of the light selective reflection layer 6 laminated including the portion where both the patterns 4 and 5 are laminated. However, FIG. 4A shows the appearance when observed under natural light. At this time, the pattern 21 is a latent image that cannot be visually recognized, but the tint block 22 is visible. Here, it is assumed that both the light selective reflection pattern layer 4 and the light selective reflection layer 6 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 without any pattern, and color is developed based on the helical pitch of the cholesteric liquid crystal constituting the light selective reflection layer 6. A plain part 23 'is given. At this time, reflection also occurs in the portion of the tint block 22, and the tint block 22 is preferably made of cholesteric liquid crystal having a different thickness or a different helical pitch from the plain portion 23, so that there is no pattern. This results in a reflective and colored state different from the portion 23, resulting in a visualized tint pattern 22 '. On the other hand, in the portion of the pattern 21 that is the letter “A”, the rotation direction of the incident light is reversed, and the reflected light is not observed. Therefore, the letter “A” is the uncolored pattern 21 ′ that cannot be visually recognized.

  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 background pattern portion 22 and the plain portion 23, no reflection occurs. A portion 22 'and a non-colored plain portion 23' are provided. In the portion of the pattern 21 that is the letter "A", reflection occurs because the rotation direction of the incident light is reversed, and the letter "A" is visible. A colored pattern 21 ″ is obtained.

  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 right circularly polarized light or left circularly polarized light is incident on the light selective reflection layer 6 side for observation, as described above, the right circular polarization plate or the left circular polarization plate is simply superimposed on the light selective reflection layer 6 side. It is also possible to observe.

  The authenticity determination medium 1 of the present invention described with reference to FIGS. 1 to 3 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. 5A relates to the form of the label. In the example shown in the figure, the base material 2, the alignment film 3, the light selective reflection pattern layer 4, the light inversion pattern layer 5, and the light selective reflection layer 6 are sequentially arranged. 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 FIGS. A laminated structure in which the alignment film 3 is omitted may be used.

  In the above description referring to FIG. 5A, 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, and either side Whether or not the adhesive layer is laminated depends on whether the substrate 2 side or the light selective reflection layer 6 side is 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 to the case where the authenticity determination medium label 11 is formed of the other laminated structure described with reference to FIGS.

  FIG. 5B relates to the form of the transfer sheet. In the example shown in the figure, the substrate 2, the alignment film 3, the light selective reflection pattern layer 4 and the light inversion 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 other laminated structures described with reference to FIGS. 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, 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 FIGS. 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. 6 is a diagram for explaining application of the authenticity determination medium 1 mainly for a sheet-like object. What is shown in FIG. 6A 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. 6B, the authenticity determination medium 1 is built in a sheet-like material in advance so as to be visible, and a concave 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. Using the polymerizable nematic liquid crystal solution and the polymerizable cholesteric liquid crystal solution respectively on the formed alignment film, two different patterns (nematic liquid crystal pattern and cholesteric liquid crystal pattern) consisting of letters and designs are printed by gravure printing. It was. The polymerizable nematic liquid crystal solution is a 40% solution (solvent is toluene) of a mixture of a polymerizable nematic liquid crystal (manufactured by BASF Corporation, trade name: “Paliocolor LC242”) and an ultraviolet polymerization initiator. The polymerizable cholesteric liquid crystal solution includes a polymerizable nematic liquid crystal (manufactured by BASF Corp., trade name: “Palio Color LC242”), a chiral agent (manufactured by BASF Corp., trade name: “Palio Color LC756”) and ultraviolet rays. It is a 40% solution of a blended polymerization initiator (the solvent is toluene). All were printed and dried, and then cured by irradiation with ultraviolet rays. The formed cholesteric liquid crystal pattern layer reflects right circularly polarized light.

  A gravure coating was performed on the two types of formed patterns using a polymerizable cholesteric liquid crystal solution, dried, and then irradiated with ultraviolet rays to form a cholesteric liquid crystal layer, thereby obtaining a medium for authenticity determination. . Here, the polymerizable cholesteric liquid crystal solution used for the gravure coating is a polymerizable nematic liquid crystal (manufactured by BASF Corp., trade name: “Palio Color LC242”), a chiral agent (manufactured by BASF Corp., trade name: “Palio” Color LC756 ") and a 15% solution of a blended UV polymerization initiator (the solvent is toluene), and the blending ratio of nematic liquid crystal and chiral agent was prepared differently from that for pattern printing. . The formed cholesteric liquid crystal layer reflects right circularly polarized light. The polymerizable cholesteric liquid crystal solution used for printing in the previous paragraph and the polymerizable cholesteric liquid crystal solution used for coating in this paragraph both had a polymerizable nematic liquid crystal / chiral agent blending ratio of 95.5 / 4. 5 and the ultraviolet polymerization initiator is a blend of 5% with respect to the polymerizable nematic liquid crystal.

  After forming an alignment film on one side of the TAC film by the same material, printing and coating as in Example 1, a cholesteric liquid crystal layer is formed on the alignment film without printing, and after the formation, the cholesteric liquid crystal A cholesteric liquid crystal pattern is printed on the layer, and a nematic liquid crystal pattern composed of characters and designs different from the cholesteric liquid crystal pattern is printed on the exposed surface side of the TAC film to obtain a medium for authenticity determination. It was.

  After forming an alignment film on one side of the TAC film by the same material, printing, and coating as in Example 1, a cholesteric liquid crystal layer is formed on the alignment film without printing, and then the TAC film is formed. On the exposed surface side, two different patterns consisting of characters and designs, that is, a nematic liquid crystal pattern and a cholesteric liquid crystal pattern were printed to obtain a medium for authenticity determination.

  When the right circularly polarizing plate is overlaid on the coated side of the medium for authenticity determination obtained in Example 1, reflection occurs in the cholesteric liquid crystal layer and the cholesteric liquid crystal pattern, and each color is different, A pattern based on the cholesteric liquid crystal pattern can be visually recognized. At this time, no pattern was observed in a portion corresponding to the nematic liquid crystal pattern.

  Next, when the right circularly polarizing plate was removed and the left circularly polarizing plate was overlapped, reflection occurred in the portion corresponding to the nematic liquid crystal pattern, and a colored pattern was observed, but it was reflected in the cholesteric liquid crystal layer and the cholesteric liquid crystal pattern. Therefore, the pattern based on these was not recognized. As described above, authenticity can be determined by using the right circularly polarizing plate and the left circularly polarizing plate.

  As for the authenticity determination media obtained in Example 2 and Example 3, the authenticity is determined by using the right circularly polarizing plate and the left circularly polarizing plate as in Example 1 from the light inversion pattern layer side. Was possible.

It is a figure which shows the authenticity determination medium laminated | stacked in order of the light selective reflection pattern layer and the light selective reflection layer. It is a figure which shows the medium for authenticity determination laminated | stacked in order of the light selective reflection layer and the light selective reflection pattern layer. It is a figure which shows the authenticity determination medium which divided and laminated | stacked the light selective reflection layer and the light selective reflection pattern layer on the front and back of a base material. 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 ... Authenticity determination medium 2 ... Base material 3 ... Orientation film 4 ... Light selective reflection pattern layer 5 ... Light inversion pattern layer 6 ... Light selective reflection layer 11 ... Authenticity determination medium label 13 ...... Authenticity determination medium transfer sheet 15 ...... Authenticity determination information recording body 18 ...... Authenticity determination sheet 21 ...... Pattern 22 ...... Foil pattern 23 ...... Plain portion

Claims (7)

A light selective reflection pattern layer in which the first light selective reflection layer made of cholesteric liquid crystal having a light selective reflection property for reflecting either the left circularly polarized light or the right circularly polarized light in the incident light is formed into a pattern, and the observation side It is formed so as to cover the light selective reflecting pattern layer when viewed from, said first light selective reflecting layer different in thickness or helical pitch of the liquid crystal layer, a second light selective reflection having color different cholesteric liquid crystal Authenticity determination characterized in that a layer and a light inversion pattern layer in which a light inversion layer made of nematic liquid crystal or smectic liquid crystal in which the rotation direction of incident light is reversed are laminated on a base material Media. A said substrate a transparent, claim 1, wherein the second light selective reflection layer on the observation side of the substrate, wherein the light selective reflecting pattern layer on the back side of said substrate, characterized in that it is laminated serial mounting of authenticity determination for the media. The light reverse pattern layer, and characterized by being stacked the second light selective reflection layer on the viewing side, the second between the light selective reflecting layer and the substrate, or on the back side of the substrate The medium for authenticity determination according to claim 1 or 2 . An authenticity determination medium label, wherein an adhesive layer is further laminated on the authenticity determination medium according to any one of claims 1 to 3 . You claim 1 to 3 authenticity determination medium transfer sheet, characterized in that the authenticity determination medium according to any one is stacked peelable surface of the releasable substrate. A sheet capable of authenticity determination, comprising the medium for authenticity determination according to any one of claims 1 to 3 so as to be visible in a part of the sheet. The authenticity determination medium according to any one of claims 1 to 3 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.

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