JP2005125684A - Truth or falsehood judging medium, sheet for adhering truth or falsehood judging medium, sheet for transferring truth or falsehood judging medium and truth or falsehood judging object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prism sheet which can give resistivity to further falsification by improving a conventional prism sheet having a pattern formed to bury an unevenness of an uneven surface of the prism sheet, and to provide a product applied with the same. <P>SOLUTION: The truth or falsehood judging medium 1 of this label appearance is constituted by laminating a retro-reflection pattern sheet 11 having a prism 14 and a transparent pattern layer 15 for embedding the prism 14 on a transparent sheet 12 and a hidden pattern sheet 21 for laminating a hiding pattern layer 25 laminated on a transparent sheet 22, and providing an adhesive layer 26B. Thus, the resistivity to the falsification can be improved by a retro-reflection pattern and a hiding pattern which can visualize an image. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention also relates to an authenticity determination medium, an authenticity determination medium sticking sheet, an authenticity determination medium transfer sheet, and an authenticity determination body that are difficult to tamper with and are suitable for determining authenticity.

  For example, credit cards, vouchers, etc. that can generate value by using high-value products or ID means with high economic value have means for proving their authenticity (or determining authenticity). Often taken. Labeled holograms and diffraction gratings are often used as representative means for verifying authenticity. In the following, a hologram and a diffraction grating are referred to as a “hologram”, and a label obtained by labeling them is referred to as a “hologram label”.

  Since hologram labels require advanced technology for their production, they originally have high anti-counterfeiting properties, but since many hologram labels are already available, the hologram label production technology itself is known, There is a growing demand for more advanced resistance to tampering. Therefore, along with the improvement of the hologram label, a new attempt to prove the authenticity by other means is underway.

As one of such new attempts, for example, a prism sheet having a concavo-convex structure in which a large number of prisms having a triangular cross section are arranged on the back surface is used, and the concavo-convex surface is patterned with a material whose refractive index is almost similar to that of the prism sheet. When observing from the side without unevenness, light is transmitted through the part where the uneven surface is buried, and selective retroreflection occurs where incident light from the observation side is reflected when the part is not buried. Since a retroreflective pattern according to the pattern in which the unevenness on the back surface is filled is observed, it has been proposed to use such a sheet as a transparent overlay for documents and identification cards that require authenticity determination. . (Patent Document 1).
Japanese National Patent Publication No. 10-508549.

  According to the technique described in Patent Document 1, an authenticity determination medium having a pattern with an appearance similar to that obtained by patterning a diffraction grating is obtained, and the manufacturing method is complicated, and therefore has a certain anti-counterfeiting property. However, it still needs resistance to further tampering.

  Accordingly, an object of the present invention is to provide an improved prism sheet that is provided with a resistance to further tampering by improving the conventional prism sheet in which a pattern filling the unevenness of the uneven surface of the prism sheet is formed. is there.

  According to the inventor's study, in the case of a prism sheet, by further laminating a line pattern layer that is a means for authenticity determination on a conventional prism sheet in which a pattern that fills the unevenness of the uneven surface is formed, Although it has an appearance similar to that of a conventional prism sheet in a normal state, the pattern of the line pattern layer can be made visible by superimposing transparent lines with lines, and the present invention Was able to reach.

  1st invention which solves a subject has a lamination structure where a transparent pattern layer which has an unevenness on one side of a transparent sheet, the transparent pattern layer which fills the unevenness in a pattern shape is laminated, and a hidden pattern layer was laminated The present invention relates to a characteristic authenticity determination medium.

  Further, the second invention has a laminated structure in which at least two sheets of the first and second sheets are laminated, and the first sheet has irregularities on one side of a transparent sheet, and the irregularities A transparent pattern layer that fills in a pattern, and the second sheet has a hidden pattern layer on a transparent sheet different from that in the first sheet. It is.

  A third invention is characterized in that an adhesive layer is laminated on the surface having the irregularities as viewed from the transparent sheet having the irregularities, which the laminated structure of the first or second invention has. The present invention relates to an authenticity determination medium pasting sheet.

  A fourth invention relates to a sheet for authenticity determination medium transfer, wherein a peelable sheet is laminated on the laminated structure of the first or second invention.

  5th invention is related with the authenticity determination body characterized by the said authenticity determination medium of 1st or 2nd invention being laminated | stacked on the base material.

  A sixth invention relates to the authenticity determination body according to the fifth invention, wherein the base material has a hidden pattern layer different from that of the authenticity determination medium.

  A seventh invention relates to the authenticity determination object according to the fifth invention, wherein a visualizing means for visualizing a hidden pattern of the hidden pattern layer is laminated on the base material. is there.

  According to the first invention, since it has a hidden pattern in addition to the visible retroreflection pattern, it is possible to determine whether it is true or false by using the visualization means even if it is created with a similar appearance. A true / false determination medium can be provided.

  According to the second invention, in addition to the same effects as in the first invention, the hidden pattern is laminated on a transparent sheet different from the retroreflective pattern sheet, which is suitable for forming the hidden pattern precisely. An authenticity determination medium can be provided.

  According to the third invention, since the adhesive layer is laminated on the non-observation side of the authenticity determination medium having the effects of the first or second invention, it can be easily applied to other articles as it is. It is possible to provide a label for attaching a genuine authenticity determination medium.

  According to the fourth invention, since the peelable sheet is laminated on the non-observation side of the authenticity determination medium having the effects of the first or second invention, it can be easily applied to other articles by transfer. An authenticity determination medium transfer sheet can be provided.

  According to 5th invention, the authenticity determination body with which the authenticity determination of the applied base material is easy is provided by the authenticity determination medium which has the effect of the 1st or 2nd invention applied to the base material. be able to.

  According to the sixth invention, in addition to the effect of the fifth invention, since the authenticity determination medium is applied to the base material on which the hidden pattern layer is laminated, the hidden pattern and the authenticity determination medium on the base material are applied. If the hidden pattern visualized by the hidden pattern is visible, or if the hidden pattern is on a different location from the hidden pattern on the substrate, Therefore, it is possible to provide a true / false determination object that can visualize the hidden pattern of the image using another visualization means.

  According to the seventh aspect, since the visualization means for visualizing the hidden pattern of the authenticity determination medium is laminated on the base material, in addition to the effect of the fifth aspect, the authenticity determination medium It is possible to provide a true / false determination object in which a hidden pattern can be seen.

  FIG. 1 is a schematic diagram showing an example of the authenticity determination medium of the present invention and the state of authenticity determination using the medium. As shown in FIG. 1 (a), in the authenticity determination medium 1 of the present invention, a transparent sheet 2 has a retroreflective pattern 3 that is an arrangement of English letters “ABC” in the figure, and is a rectangle surrounded by a broken line. This area has a hidden pattern 4, and the hidden pattern 4 is, for example, a line pattern. When the hidden pattern 4 is a line pattern, the authenticity determination medium 1 according to the present invention uses a transparent sheet with a line as a visible image means 5 as shown in FIG. By overlaying on the determination medium 1, a visualized pattern 4 a (which is an array of English letters “DEF” in the figure) in which the hidden pattern 4 is visualized can be observed.

FIG. 2 is a schematic diagram showing how a retroreflective pattern is generated from the authenticity determination medium of the present invention. In the example shown in FIG. 2A, a large number of transparent columnar prisms 14 having a triangular cross section extending in the direction from the front side of the drawing toward the back side are arranged and laminated on the upper surface of the transparent sheet 12 in the drawing. Accordingly, it can be said that the uneven portion 13 having a shape in which a large number of square-shaped valleys are densely arranged in the left-right direction in the figure is formed. In the example shown in FIG. 2A, the cross-sectional shape of the prism 14 is assumed to be an isosceles triangle in which the lengths of two sides other than being in contact with the transparent sheet 2 are equal, but the cross-sectional shape is an equilateral triangle. Any triangle such as a right triangle (including an isosceles triangle) may be used. Note that “upper and lower” in this specification is based on the drawing.

  In the example shown in FIG. 2A, among each V-shaped valley, three V-shaped valleys counted from the left end and three V-shaped valleys counted from the right end are filled with a transparent material, The portions not filled with the transparent material are left on the near side and the far side of the V-shaped valley. In addition, the three V-shaped valleys in the center of the figure are not filled with a transparent material, and in this way, a transparent pattern layer 15 composed of areas in which the irregularities 13 are buried in a pattern with a transparent material is formed. ing. The refractive index of light of the transparent material constituting the transparent pattern layer 15 and the material constituting the transparent sheet 12 and the prism 14 are preferably approximated. The hatching in FIG. 2 (a) is merely for easy identification of the end face of the transparent pattern layer 15, and does not indicate a cross section.

  FIG. 2B is a diagram showing the optical action of the retroreflective pattern sheet 11 having the unevenness 13 described with reference to FIG. 2A and the transparent pattern layer 15 filling the unevenness 13. Corresponding to what is shown to a), the transparent pattern layer 15 which fills the 3rd V-shaped valley from the right-and-left both ends of the unevenness | corrugation 13 is formed. Now, when light is incident in a direction (arrow direction) perpendicular to the transparent sheet 12 from the lower side to the upper side in the figure of the transparent sheet 12, the light incident on the portion where the transparent pattern layer 15 is laminated on the upper surface Transmits through the transparent sheet 12, the prism 14, and the transparent pattern layer 15 without being refracted, and this portion becomes a light transmitting portion 16. Further, in the central portion where the transparent pattern layer 15 is not laminated on the upper surface, the light is incident on the prism 14 from the transparent sheet 12 and then totally reflected at the interface between the prism 14 and air, and repeatedly reflected in the prism 14. After that, since the light is emitted in the direction opposite to the incident direction, this portion becomes the retroreflective portion 17 and constitutes the retroreflective pattern sheet 11 as a whole.

  Therefore, as shown in FIG. 1, in order to generate the retroreflective pattern 3 that is the arrangement of the English characters “ABC”, assuming the arrangement pattern of the English characters “ABC” on the retroreflective pattern sheet 11, The reverse pattern (negative pattern) may be formed as the transparent pattern layer 15. By doing so, retroreflection occurs in the portion of the partial pattern (positive pattern) without the transparent pattern layer 15. 3 is generated.

  In the above description, the retroreflective pattern sheet 11 is exemplified by a prism sheet arranged on a transparent sheet, that is, a prism sheet as a base. However, in the present invention, if a retroreflective pattern is generated, any shape of unevenness can be used as the base. You may use the sheet | seat which has. For example, instead of the prism of the prism sheet, a sheet in which lenticular lenses (kamaboko lenses) are arranged may be used. The prism sheet and the lenticular lens are two-dimensional lenses, but a retroreflective pattern can be generated even using a sheet in which a large number of minute lenses having a three-dimensional shape are densely arranged. For example, a sheet in which a large number of microlenses having a shape of a part of a sphere, a conical shape, a triangular pyramid, a quadrangular pyramid, or the like are arranged vertically and horizontally may be used. It should be noted that the transparent sheet and the layer that generates optical characteristics such as the prism and the above-described microlens are different from each other, and are more suitable for producing the transparent sheet as a base material, and use a mold. Thus, there is an advantage that irregularities of an arbitrary shape can be formed with good reproducibility, but both may be integrated, and in short, it is only necessary to have irregularities on one side of the transparent sheet. When the unevenness is the prism 14, the height of the prism is about 1 μm to 100 μm, more preferably about 5 μm to 25 μm, and the pitch is about the same as the height of the prism although it depends on the cross-sectional shape of the prism. Or a fraction of a few times.

  When the retroreflective pattern sheet 11 is based on the prism sheet as described above, if either one of the two surfaces of each prism is used as a light reflecting layer or a light scattering layer, the light reflecting layer or the light scattering layer is obtained. When viewed from one side, the light is reflected, and when viewed from the other side, the lower layer can be seen through.

  FIG. 3 is a diagram showing how the hidden pattern and the hidden pattern in the authenticity determination medium of the present invention are visualized, and the hidden pattern in the illustrated example is a line pattern formed using lines. In general, a line means an assembly in which lines having a finite width are arranged at an equal pitch as shown in FIG. 3B. Unless otherwise specified, when the line width is w, the pitch is 2w. In addition, although the line of a line may be colored with arbitrary colors, it demonstrates as a black line colored black on description here.

  As illustrated in FIG. 3A, a line pattern (hidden pattern) 25 configured using lines is formed on the base sheet 22 and the like, and a line pattern sheet (hidden pattern sheet) 21 is formed. It is configured. The background 23 of the line pattern 25 is composed of a line that rises to the right, and the part of the line of the character 24 that is the letter “A” is composed of a line that descends to the right. Although orthogonal in the figure, it does not necessarily have to be orthogonal. Here, in the background 23 and the characters 24, the ratio of the lines per unit area is the same, for example, 50%. Therefore, there is no difference in density between the background 23 and the characters 24. As the character becomes narrower, the visibility of the character 24 decreases and disappears, giving a hidden pattern. A preferable pitch of the line for preventing the hidden pattern of the line pattern sheet 21 from being seen under normal observation conditions is about 10 / mm to 20 / mm assuming an observation distance of about 30 cm. .

  FIG. 3B is a diagram illustrating a visualization means 26 for visualizing the line pattern 25. In the example shown in the figure, the visualization means 26 is provided with a uniform downward line to the right. The transparent sheet has the same pitch, line width, and line inclination as the lines constituting the characters 24 of the line pattern sheet 21 described with reference to FIG. The visualizing means made of a transparent sheet with a uniform line can visualize the hidden pattern 25 composed of the line pattern as follows. It should be noted that the line sheet, which is the visible image means 26, may be constituted by a uniform line that is reversed left and right, that is, upward to the right. Further, even if two such line pattern sheets 21 are overlapped with each other, the image can be visualized. Therefore, the two line pattern sheets can use each other as a visualizing means.

  FIG. 3C and FIG. 3D are diagrams showing a state in which a line sheet as the visualizing means 26 is superimposed on the line pattern sheet 21. FIG. 3C is a diagram in which the lines of the lines constituting the character 24 and the lines of the line sheet 26 are overlapped so as to be shifted by 1/2 pitch, and the characters 24 are black and have no gaps. (The ratio occupied by the line is 100%.) As a result of the overlapping of two types of lines that are orthogonal to each other in the background 23, the ratio occupied by the line is 75%, and the density of the characters 24 is the density of the background 23. The character 24 becomes visible. FIG. 3D is a diagram in which the lines of the lines constituting the character 24 and the lines of the line sheet 26 are overlapped in the same phase. In the background 23, the line occupies 75%, and the density of the characters 24 is lower than that of the background 23 so that the characters 24 can be visually recognized. Even if the line of the line sheet 26 is the same as the background 23 of the line pattern sheet 21, the character 24 is visualized by overlapping the line pattern sheet 12 and the line sheet 26 in the same manner as described above. Can be

  In the example cited in FIG. 3, the hidden pattern 25 is configured using two types of parallel lines having different inclinations, but using two types of parallel lines having the same inclination and a phase shifted by 1/2 pitch from each other. Hidden patterns can also be configured, and lines with different pitches, phases, or inclinations may be combined. Moreover, the line which comprises a parallel line is not restricted to a linear thing, A curved thing may be sufficient, for example, a wavy line shape may be sufficient.

  Although not shown, the hidden pattern can also be configured by using halftone dots (A) arranged at a constant vertical and horizontal pitch and halftone dots (B) having a phase different from that of the halftone dots (A). What is necessary is just to comprise only what consists of a halftone dot (A). In addition, a line can be used as the visualization means.

  When the retroreflective pattern sheet 11 and the hidden pattern sheet 21 are laminated together, the authenticity determination medium of the present invention, that is, a retroreflective pattern sheet in which the hidden pattern layer is laminated can be obtained.

  FIG. 4 is a diagram illustrating a preferred embodiment of the authenticity determination medium. In this example, the authenticity determination medium 1 is obtained by laminating both a retroreflective pattern sheet 11 on the observation side (upper surface side in the drawing) and a hidden pattern sheet 21 on the non-observation side. The retroreflective pattern sheet 11 has irregularities formed of prisms 14 and the like on the non-observation side of the transparent sheet 12, and a transparent pattern layer that fills the irregularities in a pattern is laminated. At the center of the retroreflective pattern sheet 11, the transparent pattern layer 15 does not fill the unevenness, so the air layer 15 </ b> A (indicated by a hatched horizontal line) is contained to form the retroreflective portion 17, and the other left and right Both sides are transmissive portions 16.

  In the above example, the hidden pattern sheet 21 is formed by laminating the hidden pattern layer 25 on the observation side of the transparent sheet 28. An adhesive layer 27A is interposed between the retroreflective pattern sheet 11 and the hidden pattern sheet 21, and the two sheets are laminated with each other. On the non-observation side of the transparent sheet 28, the authenticity determination medium 1 is provided. An adhesive layer 27B for applying to other articles is laminated. When the most non-observed adhesive layer 27B is a pressure-sensitive adhesive layer, it is preferable that a peelable sheet is further laminated on the non-observed side. Thus, what the authenticity determination medium 1 is accompanied by the adhesive layer 27B on the non-observation side is the authenticity determination medium application sheet, and the non-observation adhesive layer of the authenticity determination medium application sheet is The pressure-sensitive adhesive layer is preferable.

  In the authenticity determination medium 1 described with reference to FIG. 4, since the hidden pattern sheet 21 is constituted by the transparent sheet 28 and the hidden pattern layer 25, a smooth one is used as the transparent sheet 26. Since the hidden pattern layer 25 is formed by a printing method as an object to be printed, the hidden pattern can be precisely formed. Further, since the adhesive layer 27A is interposed between the retroreflective pattern sheet 11 and the hidden pattern sheet 21 and the both sheets are laminated to each other, it is possible to firmly bond the both sheets.

  As described below, the authenticity determination medium 1 of the preferred embodiment described with reference to FIG. 4 can omit some of the layers or change the order of stacking.

  As already described, the transparent sheet 12 and the concaves and convexes (representing the prism 14 in FIG. 4 representatively) constituting the retroreflective pattern sheet 11 are not separate layers but may be integrated. .

  The hidden pattern layer 25 may be a single layer without the transparent sheet 28. In this case, not only the lamination of the transparent sheet 28 but also the adhesive layer 27A may be omitted, and the hidden pattern layer 25 may be directly provided on the non-observation side of the retroreflective pattern sheet 11. In this case, the hidden pattern layer 25 What is necessary is just to laminate | stack the adhesive bond layer 27B on the non-observation side as needed. In the authenticity determination medium in which the hidden pattern layer 25 is laminated directly on the non-observation side of the retroreflective pattern sheet 11, the portion where the transparent pattern layer 15 is present is uneven, but the portion where the transparent pattern layer 15 is not present Then, since the surface having unevenness becomes the surface to be printed, it is a portion with the transparent pattern layer 15 that can perform high-quality printing.

  The authenticity determination medium 1 may be one in which the hidden pattern sheet 21 is laminated on the observation side and the retroreflective pattern sheet 11 is laminated on the non-observation side. In the hidden pattern sheet 21 composed of the transparent sheet 28 and the hidden pattern layer 25, the transparent sheet 28 may be on the observation side, and the hidden pattern layer 25 may be on the observation side.

  Further, the authenticity determination medium 1 may omit the transparent sheet 28 of the hidden pattern sheet 21 from the laminated structure in which both the hidden pattern sheet 21 on the observation side and the retroreflective pattern sheet 11 on the non-observation side are laminated. . In this case, since the hidden pattern layer 25 is exposed to the observation side, and there is a risk of wear of the hidden pattern layer 25 or dissolution by a solvent, a protective coating film that is not a transparent sheet is laminated on the observation side of the hidden pattern layer 25. May be.

  The authenticity determination medium 1 of the present invention may be accompanied by a normal pattern in addition to the retroreflective pattern and the hidden pattern. With a normal pattern, it is effective for camouflage that makes it difficult for the viewer to notice the presence of the hidden pattern. The position where the normal pattern is formed is arbitrary, but when the hidden pattern layer 25 is the hidden pattern sheet 21 with the transparent sheet 28, it is preferable that the normal pattern is also formed on the transparent sheet 28.

  The authenticity determination medium 1 of the present invention can be laminated on an arbitrary base material so that the authenticity of the stacked base material can be discriminated, and the resistance against forgery of the base material can be improved.

  FIG. 5 is a diagram illustrating the authenticity determination body of the present invention to which the authenticity determination medium 1 as described above is applied. The authenticity determination body 31 of this example has a hidden pattern layer 33 that is different from the authenticity determination body 1 on the base material 32, and is further described above with reference to FIG. The false determination medium 1 is formed by laminating the most non-observation side adhesive layer 27B of the authenticity determination medium 1. When the hidden pattern layer 33 is stacked on the base material 32 at the position where the authenticity determination medium 1 is stacked, at least the hidden pattern layer 25 as a result of overlapping with the hidden pattern layer 25 of the authenticity determination medium 1 is hidden. The hidden pattern of the pattern layer 25 is visualized. As described above, the authenticity determination body 31 in which the hidden pattern layer 33 is stacked at the position where the authenticity determination medium 1 is stacked, when the authenticity determination medium 1 is separated, the hidden pattern becomes invisible. In other words, it is possible to prevent “re-sticking” applied to other articles. In addition, when the hidden pattern layer 33 is stacked at a position other than where the authenticity determination medium 1 is stacked, the hidden pattern at a position other than where the authenticity determination medium 1 is stacked cannot be seen as it is. Therefore, it is necessary to visualize the image using another visualization means. In addition, since the hidden pattern layer 33 laminated | stacked on the base material 32 in said description is laminated | stacked as needed, you may omit without laminating | stacking in this way.

  The base material 32 is, for example, a credit card, a voucher, or the like that can generate value when used as a high-priced product or ID means with high economic value, as exemplified in the background art. Not exclusively. Various printings may be performed on the substrate 32 as necessary. Various printing is performed according to the necessity of design and content display. When the base material 32 is accompanied by the hidden pattern layer 33, the person who viewed it is the same as in the authenticity determination medium 1. However, there is an advantage that it is difficult to notice the presence of the hidden pattern. In addition, the base material 32 may be provided with various information recording means other than printing.

  In order to form the authenticity determination body 31 as described with reference to FIG. 5, the authenticity determination medium transfer sheet is used in addition to the authenticity determination medium application sheet described with reference to FIG. This can also be done by forming and using. The authenticity determination medium transfer sheet corresponds to a sheet in which a peelable sheet is detachably laminated on the exposed surface of the transparent sheet 12 of the retroreflective pattern sheet 11 of the authenticity determination medium 1 described with reference to FIG. The adhesive layer 27B on the non-observation side of the authenticity determination medium 1 is more convenient to be laminated, but can be omitted when the adhesive layer is laminated on the adherend.

  In the present invention, the transparent sheet 12 used for the retroreflective pattern sheet 11 is a layer to be processed when the unevenness 13 is provided by direct molding, or a layer to be processed when the unevenness 13 is provided as another layer. Yes, it has the mechanical strength required for these processes, has heat resistance and solvent resistance, and has the heat resistance required when applying the authenticity determination medium to other articles. It is preferable. Therefore, as the transparent sheet 12, it is preferable to use various plastic films having these performances. For example, a biaxially stretched polyethylene terephthalate film (hereinafter simply referred to as a PET film) can be used. Other transparent plastic films may be used. When a PET film is used as the transparent sheet 12, the thickness is preferably 5 μm to 250 μm. The thickness is preferably 10 μm to 50 μm in consideration of the above-mentioned necessary characteristics, processability, thermal efficiency during thermal transfer, and the like. Also, as the transparent sheet 22 used for the hidden pattern sheet 21, a plastic film similar to the above can be used.

  When the projections and depressions 13 that are separate from the transparent sheet 12 are provided, such as the prism 14, a template having a reverse shape of a predetermined shape is prepared, and the template is arranged with a space between the template and the template. By filling a transparent ultraviolet curable resin composition or the like between the transparent sheet 12 and curing by ultraviolet irradiation or the like, by peeling the transparent sheet 12 and the cured product laminated on the surface thereof, Unevenness 13 can be formed. Further, when the unevenness 13 is imparted to the transparent sheet 12 itself, the temperature at which the transparent sheet 12 is thermally deformed by sandwiching the transparent sheet 12 between a flat plate and a template having a reverse shape of a predetermined shape on the surface. It can be formed by molding to give irregularities by heating and pressing, and then releasing. In forming any of the irregularities 13, the template may be in the form of a roller, and the flat plate in molding may be replaced with a roller.

  The transparent pattern layer 15 is formed by filling the uneven surface 13 on the surface having the uneven surface 13 obtained as described above, and is necessary for leveling the uneven surface 13 depending on the height of the uneven surface 13. It is necessary to form a layer with a sufficient thickness, and it is preferable to use a method capable of increasing the amount of filling, such as a silk screen printing method. The transparent pattern layer 15 is preferably made of a transparent resin having a refractive index of light that approximates the material that forms the unevenness 13.

  The adhesive layers 27A and 27B can be made of various materials, and a heat-sensitive adhesive can also be used, but an adhesive can also be used. This is because the adhesive layer 27A is preferably a pressure-sensitive adhesive whose adhesive strength improves with time because it is necessary to bond the top of the concave and convex portions and the hidden pattern sheet 21 at a portion where the transparent pattern layer 15 is not provided. In addition, the adhesive layer 27B is not limited by the surface of the adherend being uneven, and may be composed of either a heat-sensitive adhesive or a pressure-sensitive adhesive. The thickness of the adhesive layers 27A and 27B is about 1 μm to 50 μm.

  Examples of the heat-sensitive adhesive that can form the adhesive layers 27A and 27B include ethylene / vinyl acetate copolymer resin, polyamide resin, polyester resin, polyethylene resin, ethylene / isobutyl acrylate copolymer resin, butyral resin, polyvinyl acetate, and the like. Examples thereof include copolymer resins, cellulose derivatives, polymethyl methacrylate resins, polyvinyl ether resins, polyurethane resins, polycarbonate resins, polypropylene resins, epoxy resins, and phenol resins, and thermoplastics such as SBS, SIS, SEBS, or SEPS. Examples thereof include an elastomer or a reaction hot melt resin.

  Examples of the pressure-sensitive adhesive that can constitute the adhesive layers 27A and 27B include acrylic resins (including copolymers), acrylic ester resins (including copolymers), styrene / butadiene copolymers, polyester resins, and chlorides. Vinyl / vinyl acetate copolymer, natural rubber, casein, gelatin, rosin ester, terpene resin, phenolic resin, styrene resin, chromanindene resin, polyvinyl ether resin, silicone resin, α-cyanoacrylate resin, silicone resin , Maleimide resins, styrene resins, polyolefin resins, resorcinol resins, polyvinyl ether resins, silicone resins, and the like. When using a pressure-sensitive adhesive, it is preferable to laminate a release sheet on the exposed surface of the pressure-sensitive adhesive layer for protecting the pressure-sensitive adhesive layer. As the release sheet, a paper or plastic film subjected to a release treatment Can be used.

  The authenticity determination medium 1 of the present invention includes (1) various products for which authentication of genuine products is significant, such as printer consumables, electronic devices, electrical devices, computer products, pharmaceuticals, chemicals, etc. (2) Luxury brand products strongly demanded by consumers that the product itself is genuine, such as watches, clothing, bags, jewelry, sporting goods, or cosmetics. (3) Identification means (ID certificate), such as a passport , Driver's license, insurance card, library card, etc. (4) When used for applications such as gift certificates, gift certificates, prepaid cars, etc. that are required to be genuine in order to maintain economic order High value.

  An ultraviolet curable resin liquid and an uneven mold are stacked on a PET film having a thickness of 50 μm, and the ultraviolet curable resin liquid is cured by irradiating with ultraviolet rays. An uneven sheet having an uneven shape in which a large number of prisms are arranged was prepared. On the side of the concavo-convex sheet, the surface of the concavo-convex sheet is printed by a silk screen printing method so that the concave portion is filled and the surface is flattened. When viewed from above, a retroreflective pattern sheet was obtained in which the printed characters and symbols were reflected.

  Aside from the above, a hidden pattern consisting of a line pattern was printed on a PET film having a thickness of 25 μm by an offset printing method, and a polyester resin-based heat-sensitive adhesive was applied to the printed surface to a thickness of 5 μm. Then, it heat-laminated on the pattern printing surface side of the retroreflection pattern sheet obtained above. Thermal lamination was performed by passing between heated nip rollers under conditions of roller heating temperature: 150 ° C., speed: 0.8 m / min. A polyester resin-based heat-sensitive adhesive was applied to the exposed surface on the side of the PET film having a thickness of 25 .mu.m so as to have a thickness of 5 .mu.m, thereby producing a label authenticity judgment medium.

  The created label appearance authenticity determination medium is pasted on the printed surface of the printed material on the paper base material to obtain a trueness determination body (a laminate of the authenticity determination medium and the base material). Characters and symbols consisting of reflective parts originating from the above can be observed, and the hidden pattern is revealed by overlapping the line sheets forming the lines with the same pitch as the lines constituting the hidden pattern. I was able to image and observe. Moreover, the same result was acquired even if it affixed on the printing surface of the printed matter of a plastic base material.

  As in the first embodiment, however, as a paper base material to which the created label format authenticity determination medium is attached, the lines having the same pitch as the lines constituting the hidden pattern A of the authenticity determination medium are used. Using the one provided with the hidden pattern B formed by using, the authenticity determination medium was pasted on the hidden pattern provided on the paper base material to obtain the authenticity determination body. This authenticity determination body, as it is, observes characters and symbols made of a reflective part derived from the authenticity determination medium and a manifestation of the hidden pattern A derived from the authenticity determination medium. I was able to. In addition, it is provided on the paper base material where the authenticity judgment medium is not pasted by superimposing the line sheet that forms the line with the same pitch as the line constituting the hidden pattern B provided on the paper base material. The hidden pattern B could be visualized and observed. Moreover, the same result was acquired even if it affixed on the printing surface of the printed matter of a plastic base material.

It is a schematic diagram which shows the authenticity determination medium and the state of authenticity determination. It is a schematic diagram which shows the mechanism in which a retroreflection pattern produces | generates from an authenticity determination medium. It is a schematic diagram which shows the state of the hidden pattern of a true / false determination medium and visualization. It is a figure which shows the preferable Example of a true / false determination medium. It is a figure which shows the authenticity determination body to which an authenticity determination medium is applied.

Explanation of symbols

1 …… Authenticity determination medium 2 …… Transparent sheet 3 …… Retroreflective pattern 4 …… Hidden pattern (line pattern, 4a; visualization pattern)
5 ... Visualization means (line sheet)
11: Retroreflective pattern sheet 21 ... Line pattern sheet 31 ... Authenticity judgment body

Claims (7)

  An authenticity determination medium having a laminated structure in which a transparent pattern layer having irregularities on one side of a transparent sheet, a transparent pattern layer filling the irregularities in a pattern, and a hidden pattern layer are laminated.   A transparent pattern layer having a laminated structure in which at least two first and second sheets are laminated, the first sheet having irregularities on one side of a transparent sheet, and filling the irregularities in a pattern. And the second sheet has a hidden pattern layer on a transparent sheet different from that in the first sheet.   An authenticity determination medium affixing, wherein an adhesive layer is laminated on a surface of the laminated structure according to claim 1 or 2 as viewed from the transparent sheet having the unevenness. Wear sheet.   3. A sheet for authenticity determination medium transfer, wherein a peelable sheet is laminated on the laminated structure according to claim 1 or 2.   The authenticity determination body, wherein the authenticity determination medium according to claim 1 or 2 is laminated on a base material.   6. The authenticity determination body according to claim 5, further comprising a hidden pattern layer that is different from the authenticity determination medium on the base material. 6. The authenticity determination body according to claim 5, wherein a visualizing means for visualizing a hidden pattern of the hidden pattern layer is laminated on the base material.

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