JP2006011042A - Authenticity judging medium, label for sticking authenticity judging medium, transfer sheet for authenticity judging medium, and authenticity judging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prism sheet to which higher resistance against alteration is imparted by improving a conventional prism sheet forming a pattern burying recesses and projections on a rugged surface of a prism sheet. <P>SOLUTION: A prism sheet having a rugged surface 3 on the lower surface of a transparent sheet 2 is prepared, on which a transparent pattern layer 4 to bury recesses and projections into a pattern and an aluminum or copper thin film layer 6 in which recording can be performed with laser light or the like are layered so as to record an invisible recording part and a visible recording part in the thin film layer. Thereby, alteration is made difficult as well as verification based on an ID number or the like recorded in the invisible recording part and the visible recording part can be performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention also relates to an authenticity determination medium, an authenticity determination medium application label, an authenticity determination medium transfer sheet, and an authenticity determination body that are difficult to falsify and are suitable for determining authenticity.

  For credit cards, cash vouchers, etc. that can generate value by using high-value products with high economic value or ID means, means for determining whether or not they are authentic, that is, determine authenticity In many cases, measures are taken. As a typical means for determining authenticity, a hologram label, or a hologram or a diffraction grating whose appearance is similar to a hologram is used.

  Hologram labels originally have high anti-counterfeiting properties because they require advanced technology for their production, but many types of hologram labels are already available, and the hologram label production technology itself is known. More and more resistance to tampering has been demanded. Therefore, along with the improvement of the hologram label, a new attempt has been made to make it possible to determine authenticity by other means.

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 is desirable to provide 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, a thin film layer such as aluminum or copper that can be recorded with a laser beam or the like on a conventional prism sheet in which a pattern that fills the irregularities of the irregular surface is formed. By stacking and forming a hidden pattern on the thin film layer, it becomes difficult to tamper with, and by recording an ID number or the like as necessary, verification based on the recorded ID number can be performed. The headline and the present invention could be reached.

  1st invention which solves a subject has an unevenness in one side of a transparent sheet, a transparent pattern layer which fills the unevenness in a pattern shape, and a thin film layer whose light transmittance or light reflectance changes by heating And a thin film layer having a recording portion formed of a hidden pattern based on the difference in light transmittance or the difference in light reflectance. Is.

  According to a second aspect of the present invention, there is provided the authenticity determination medium according to the first aspect of the invention, wherein the shape of the irregularities is a shape of a surface when prisms having a triangular cross section are closely arranged. .

  According to a third invention, in the first or second invention, the thin film layer is laminated on a base material sheet different from the transparent sheet to constitute a laminated sheet, and the laminated sheet is formed with the transparent pattern layer. The present invention relates to a true / false determination medium characterized by being laminated.

  A fourth invention is characterized in that an adhesive layer is laminated on a surface opposite to the transparent sheet side of the laminated structure according to any one of the first to third inventions, and the authenticity determination medium affixing It is about labels.

  A fifth invention relates to a true / false determination medium transfer sheet, wherein a peelable sheet is laminated on the transparent sheet side of the laminated structure of any one of the first to third inventions.

  6th invention is related with the authenticity determination body characterized by the above-mentioned authenticity determination medium of any one of the 1st-3rd invention being laminated | stacked on the base material.

  According to the first invention, in addition to the visible retroreflective pattern based on the transparent sheet having irregularities and the transparent pattern layer, from the hidden pattern to the thin film layer whose light transmittance or light reflectance changes by heating. Therefore, it is possible to provide a true / false determination medium that is more difficult to forge and that can perform true / false determination using a hidden pattern.

  According to the second invention, in addition to the effect of the first invention, the unevenness of the transparent sheet is made to be the shape of the surface when the prisms whose sections are triangular are closely arranged, so the obtained retroreflective pattern is clear A true / false determination medium can be provided.

  According to the third invention, in addition to the effects of the first or second invention, it is possible to provide an authenticity determination medium that is easy to manufacture and ensures the thickness accuracy of the thin film layer.

  According to the fourth invention, since the adhesive layer is laminated on the side opposite to the transparent sheet of the authenticity determination medium having the effect of any one of the first to third inventions, it can be directly pasted on another article. It is possible to provide an authenticity determination medium sticking label that can be easily applied.

  According to the fifth invention, since the peelable sheet is laminated on the transparent sheet side of the authenticity determination medium having the effects of any one of the first to third inventions, it can be applied to other articles by transfer. An easy authenticity determination medium transfer sheet can be provided.

  According to the sixth invention, since the authenticity determination medium having the effects of any one of the first to third inventions is applied on the base material, it is possible to provide an authenticity determination body that can easily determine the authenticity. Can do.

  FIG. 1 is a diagram illustrating a laminated structure of the authenticity determination medium of the present invention. FIG. 2 is a diagram illustrating an authenticity determination medium sticking label suitable for sticking the authenticity determination medium of the present invention to a target part. FIG. 3 is a diagram illustrating an authenticity determination medium transfer sheet suitable for applying the authenticity determination medium of the present invention to a target article by transfer. FIG. 4 is a view showing that a pattern can be seen based on the unevenness and the transparent pattern layer filling the unevenness in the authenticity determination medium 1 of the present invention. FIG. 5 is a diagram showing a state in which a recording portion is formed on the thin film layer of the authenticity determination medium of the present invention. FIG. 6 is a view showing a recording medium formed on the authenticity determination medium of the present invention. FIG. 7 is a diagram showing an invisible recording portion of the authenticity determination medium 1 of the present invention and a determination method thereof. FIG. 8 is a diagram showing a true / false determining object to which the true / false determining medium of the present invention is applied.

  As shown in FIG. 1 (a), the authenticity determination medium 1 of the present invention is directed from the laborious side to the far side in the figure having an inverted equilateral triangular cross section on the entire lower surface of the transparent sheet 2 in the figure. Concavities and convexities 3 formed by arranging a large number of triangular prisms are provided, and a transparent pattern layer 4 that fills the concavities and convexities 3 in a pattern is laminated on the lower surface of the concavities and convexities 3. The thin film layer 6 in which the light transmittance or the light reflectance is changed by heating is laminated so as to cover the lower surface of the concavo-convex 3 in a portion without the transparent pattern layer. In addition, when the thin film layer 6 has transparency, it is also possible to laminate | stack the thin film layer 6 on the upper surface of the transparent sheet 2 in a figure, between the transparent sheet 2, and the unevenness | corrugation 3, etc. Air exists between the lower surface of the unevenness 3 and the thin film 6 at the portion of the lower surface of the unevenness 3 where there is no transparent pattern layer 4.

  As shown in FIG. 1B, the authenticity determination medium 1 according to the present invention includes a thin film layer 6 and a thin film layer 6 in the laminated structure described with reference to FIG. The laminated sheet may be replaced with a laminated sheet with the base material sheet 7 on the lower surface, and the laminated sheet is upside down from that shown in the figure, that is, the base material sheet 7 side has the transparent pattern layer 4 and the unevenness 3. It may be laminated facing the side.

  When the composite sheet in which the transparent sheet 2, the unevenness 3, and the transparent pattern layer 4 are sequentially laminated is viewed from the transparent sheet 2 side, the planar shape of the transparent pattern layer 4, that is, light reflection based on the pattern shape. Give a pattern.

  As shown in FIG. 4A, the incident light 11 incident from the transparent sheet 2 side passes through the unevenness 3 and reaches the transparent pattern layer 4 at a portion where the transparent pattern layer 4 exists. In a place without 4, the light is totally reflected at the interface between the unevenness 3 and the air, and finally becomes the reflected light 12 that returns in the direction in which the incident light 11 enters. Therefore, according to the pattern of the transparent pattern layer 4, exactly, the portion corresponding to the pattern having a negative and positive relationship with the portion having the transparent pattern layer 4 becomes the reflecting portion 13, and the other portion is the non-reflecting portion. 14 For example, when the character portion of the capital letter “N” is a positive pattern, the lower surface of the unevenness 3 other than the capital letter “N” is filled with the transparent pattern layer 4 to obtain the pattern shown in FIG. As shown, the reflecting portion 13 having the shape of the capital letter “N” can be obtained by illumination.

  The above description is based on a prism sheet in which prisms having an equilateral triangle cross section are arranged on a transparent sheet. However, as long as the pattern-like reflecting portion 13 is obtained based on the shape of the transparent pattern layer 4 filling the unevenness 3. A sheet having irregularities of any shape may be used.

  For example, the cross-sectional shape of the prism is not limited to the regular triangle described above, and may be any triangle such as an isosceles triangle or a right triangle. In addition, a lenticular lens sheet in which lenticular lenses (kamaboko lenses) are arranged may be used instead of the prism sheet having a prism whose cross section may also be a triangle. Furthermore, these prism sheets and lenticular lens sheets have a two-dimensional lens, but may have a three-dimensional lens. A sheet in which a large number of microlenses having a shape of a sphere, a cone, a triangular pyramid, a quadrangular pyramid, or the like are arranged vertically and horizontally may be used.

  Moreover, the transparent sheet 2 and the unevenness | corrugation 3 which are mutually different layers are suitable for forming the unevenness | corrugation 3 by using the transparent sheet 2 as a base material, Moreover, arbitrary shapes are used by using a type | mold. Although there is an advantage that the unevenness can be formed with good reproducibility, the transparent sheet 2 and the unevenness 3 may be integrated, and in short, it is sufficient that the transparent sheet 2 has an uneven shape on one side.

  Taking the case where the unevenness 3 is a prism as an example, the height of the prism is about 1 μm to 100 μm, more preferably about 5 μm to 25 μm, and the pitch depends on the cross-sectional shape of the prism. Or about 1 to several times.

  In the authenticity determination medium 1 of the present invention, the thin film layer 6 laminated in addition to the transparent sheet 2, the unevenness 3, and the transparent pattern layer 4 changes light transmittance or light reflectance by heating. Therefore, recording can be performed by heating by an appropriate means. The thin film layer 6 will be described later, but the thickness is 1 μm or less.

  As illustrated in FIG. 5, by irradiating the laser light 16 emitted from the laser light source 15 to the thin film layer 6 of the authenticity determination medium 1 through the lens 17, the thin film layer 6 is collected at the light collecting portion. The light transmittance or light reflectance is changed. For example, the thin film layer 6 is removed by evaporation or the like with the laser beam 16 in the light condensing part, and a through hole having a fine diameter is generated. By generating such a through hole based on input information, the recording unit 18 can be formed.

  The laser beam used for recording on the thin film layer 6 may be either continuous light or pulsed light. The continuous laser beam can always maintain the same output for a fixed time, and the pulsed laser beam can obtain a high output only for a very short time.

  Pulse laser light can be obtained by controlling the output of CW laser light (continuous light) using an external modulator, or by inserting a Q switch into the laser resonator and accumulating it in the laser medium by switching the Q switch. There is a method to output the energy immediately. Argon laser, He-Ne laser, YAG laser, or semiconductor laser is used, mechanical shutter, A / O modulation element, or E / O modulation element, etc. are inserted as external modulators as Q switches, and the Q value of the resonator is determined. By controlling, pulsed light having a time width of several tens of nanoseconds to several hundred nanoseconds can be generated.

  FIG. 6 shows a state in which numbers and the like are recorded by the recording unit 18. In both FIG. 6A and FIG. 6B, right and left along the upper side of the authenticity determination medium 1 in the drawing. The thin film layer 6A is laminated in the direction and the thin film layer 6B is laminated in the left-right direction along the lower side. The invisible recording portion 18A is formed in the thin film layer 6A laminated along the upper side, and is laminated along the lower side. The visible recording portion 18B having the number “0001234” is formed on the thin film layer 6B. 6A and 6B, in the portion between the two thin film layers 6 and 6 along the upper side and the lower side, the reflecting portion 13 having the shape of the capital letter “N” is formed. The thin film layer 6 is formed as described with reference to FIGS. 4 (a) and 4 (b) and has the same shape as the shape of the capital letter “N”. The thin film layer 6 is removed in the white background portion other than the capital letter “N”. Here, the external appearance of the reflecting portion 13 is different between FIG. 6A and FIG. 6B when the reflecting portion 13 is viewed from the normal direction. The reflection part 13 can be clearly seen due to the difference in reflection at, but when viewed at a position with a large angle from the normal, the difference in reflection between the reflection part 13 and the non-reflection part 14 becomes small, and the clarity gradually decreases. This is to show that.

  FIG. 7 is a diagram illustrating a method for determining the invisible recording unit 18A and the invisible recording unit 18A using a determination tool. In the example shown in FIG. 7, the invisible recording portion 18A is entirely composed of lines. A line is a line in which the width is a and the lines are arranged at a pitch of 2a in the width direction of each line, and is usually obtained by exposing and developing a silver salt photographic film in a predetermined pattern, or Although it is a printed matter printed on a transparent film, in the present invention, the thin film layer is obtained by heating the thin film layer with a thermal printer or laser light and removing the thin film layer in the heating section.

  In FIG. 7A, the number “12” is formed by a 45 ° inclined line from the lower left to the upper right inside the ellipse, and the background other than the number constitutes the number “12”. The parallel lines are formed by parallel lines having the same inclination and pitch and having a phase shifted by 1/2 pitch. If the outline of the square composed of the lines in FIG. 7A is about 40 mm long × 40 mm wide and the width and pitch of the lines are large, the presence of the number “12” is visually recognized. However, if the width of the line is reduced to about 0.1 mm, it becomes difficult to distinguish from a distance of about 25 cm, and if the width of the line is further reduced, it cannot be judged with the naked eye. become.

  As shown in FIGS. 7B and 7C, the number “12” can be visualized by placing the discriminator 19 on the invisible recording portion 18A as described above. The discriminator 19 is composed of lines having the same line width and pitch as the lines constituting the invisible recording portion 18A, and is transparent between the black lines.

  In FIG. 7B, the lines of the line of the discriminator 19 overlap each other between the lines of the background line of the invisible recording portion 18A, and the number “12” has the number “12”. 12 ”and the lines of the discriminator 19 are overlapped with each other, so that light is transmitted between the lines, so that a contrast occurs between the background and the number“ 12 ”. The number “12” can be visually recognized.

  In FIG. 7C, each line of the lines forming the background of the invisible recording portion 18A and each line of the lines of the discriminating tool 19 overlap each other, and light is transmitted between the lines. In the portion “”, each line of the discriminator 19 of the discriminator 19 is positioned between the lines of the line constituting the number “12”, so that the light does not pass through and the portion of the number “12” is black. The contrast is generated between the background and the number “12”, and the number “12” can be visually recognized.

  Note that the invisible recording portion 18A is not limited to the example constituted by the same lines as described above. In the above example, the number “12” and the background are all formed by parallel lines having the same inclination and pitch, but may be formed by mutually different lines. For example, in the above example, the number “12” may be formed by a line extending from the upper left to the lower right. In addition to the lines, halftone dots are used, and the background and the number “12” can be formed by halftone dots arranged at a normal pitch and halftone dots deviating from the normal pitch.

  As described above, the authenticity determination medium 1 according to the present invention can visually recognize the reflective pattern due to the reflection of light based on the presence of the reflecting portion 13, and also the invisible recording portion 18 </ b> A formed on the thin film layer 6. Since the visible recording part 18B is added, the invisible recording part 18A can be discriminated using a discriminator. Therefore, the authenticity determination can be performed in two ways. In addition to the invisible recording portion 18A, the visible recording portion 18B can also perform recording. By recording numbers and the like in these recording portions 18A and 18B, alteration can be made more difficult and recorded. By making the number an ID number and listing the information corresponding to the ID number in advance, it is possible to collate the details of the product, the history, etc. with the ID number as an index. Alternatively, if a barcode is recorded in the invisible recording unit 18A and / or the visible recording unit 18B, distribution can be managed by reading the barcode and collating data previously associated with the barcode. You can also The authenticity determination medium 1 of the present invention basically includes the transparent sheet 2, the unevenness 3 having a thickness of about 1 to 100 μm as an example, and the thin film layer 6 having a thickness of 1 μm or less. It is possible, and it is suitable for sticking to various target articles.

  The transparent sheet 2 constituting the authenticity determination medium 1 is a layer to be molded when the unevenness 3 is provided directly by molding, and is a layer to which the unevenness 3 is stacked when the unevenness 3 is provided as another layer. Therefore, it has the mechanical strength, heat resistance, solvent resistance, etc. necessary for the molding and lamination processing, and is necessary when applying the authenticity judgment medium to other articles by sticking etc. It is preferable to have mechanical strength and heat resistance.

  As the transparent sheet 2, it is preferable to use various plastic films having the above-mentioned various performances. For example, a biaxially stretched polyethylene terephthalate film (hereinafter simply referred to as PET film) can be used. It may be a transparent plastic film. When using a PET film as the transparent sheet 2, the thickness is preferably 5 μm to 250 μm. The thickness is more preferably 10 μm to 50 μm in consideration of the above-mentioned necessary characteristics, workability, thermal efficiency during thermal transfer, and the like.

  In addition, the plastic film similar to the above can be used also as a base material sheet for comprising the laminated sheet of the thin film layer 6 and the base material sheet 7 demonstrated referring FIG.1 (b).

  As described with reference to FIG. 1, when the unevenness 3 separate from the transparent sheet 2 is provided, for example, a template having an inverted shape of the shape of the unevenness 3 is prepared on the surface. A transparent ultraviolet curable resin composition or the like is filled between the transparent sheet 2 and the transparent sheet 2 arranged with a space between them, and cured by ultraviolet irradiation or the like, and then laminated on the transparent sheet 2 and the surface thereof. Unevenness 3 can be formed by separating the cured product from the template. Further, when the unevenness 3 is imparted to the transparent sheet 2 itself, the transparent sheet 2 is sandwiched between a template having a reverse mold shape of the unevenness 3 on the surface and another flat plate, and the transparent sheet 2 is thermally deformed. The unevenness 3 can be formed by applying pressure while heating to a temperature to be heated, and then releasing. In forming any of the irregularities 3, the template may be in a roller shape, and the flat plate in molding may be replaced with a roller shape.

  The transparent pattern layer 4 is formed by embedding the unevenness 3 in a pattern on the surface having the unevenness 3 obtained as described above, and the unevenness 3 is leveled depending on the height of the unevenness 3. Therefore, it is preferable to form by a method capable of increasing the amount of ink, such as a silk screen printing method. The transparent pattern layer 4 is preferably made of a transparent resin having a refractive index of light that is the same as or close to that of the material constituting the unevenness 3. By doing so, FIG. As described above, the incident light 11 incident from the transparent sheet 2 side is more reliably transmitted through the unevenness 3 and reaches the transparent pattern layer 4 in a portion where the transparent pattern layer 4 exists. .

  The thin film layer 6 may be made of any material as long as the light transmittance or the light reflectance is changed by heating. For example, aluminum (Al), zinc (Zn), indium (In), gold (Au), silver (Ag), cobalt (Co), tin (Sn), selenium (Se), titanium (Ti), iron (Fe ), Tellurium (Te), copper (Cu), lead (Pb), nickel (Ni), or a single metal such as palladium (Pd), or an alloy of these metals to form the thin film layer 6. it can. The thin film layer 6 made of these metals or alloys is melted, evaporated, or phase-changed by irradiating laser light, and light is emitted between a portion irradiated with the laser light and a portion not irradiated. However, in general, the portion irradiated with the laser beam melts or evaporates to form a through-hole penetrating the thin film layer 6, and the light transmittance is reduced. Differences and light reflectance differences are produced.

  As a method for forming the thin film layer 6 with the metal or alloy as described above, a thin film forming method such as a vacuum deposition method, a sputtering method, or an ion plating method can be cited. The thickness of the thin film layer 6 is 50 mm. ˜1 μm is preferable, and 100 to 1000 μm is more preferable. When the thin film layer 6 has transparency, the thickness is preferably 200 mm or less, and when the thin film layer 6 has concealability, the thickness is preferably 200 mm or more.

  The thin film layer 6 can also be configured using a composition comprising a color former, a developer and a binder resin, or a composition comprising a color former, a developer, a sensitizer and a binder resin. The former is introduced, for example, in JP-A-5-58031, and the latter is introduced, for example, in JP-A-5-57463.

  As the color former, any color-developing substance used as an electron donor in a heat-sensitive recording material can be used. And colorless leuco dyes such as fluoran dyes are preferred.

  As the developer, any acidic substance used as an electron acceptor in a heat-sensitive recording material can be used, and it is roughly classified into an inorganic developer and an organic developer. Examples of the inorganic developer include acidic clay, kaolin, or zeolite. Organic developers include (1) aromatic carboxylic acids, anhydrides or metal salts thereof, (2) organic sulfonic acids or other organic acids, or (3) phenolic compounds and phenolic compounds. Mention may be made of methylolated compounds or salts or complexes of phenolic compounds. Among these, as the developer, the phenolic compound (3), a methylolated phenolic compound, or a salt or complex of a phenolic compound is preferable.

  As the sensitizer, borates, phosphates, silicates, and the like are preferable. However, zinc borate or aluminum borate, zinc phosphate or aluminum phosphate, cordierite, and mica are preferable in terms of color development. Is more preferable.

  A coating composition is prepared by dissolving or dispersing the above color former, developer, sensitizer blended as necessary, and appropriate binder resin together with water, alcohol or other appropriate solvent. The thin film layer 6 can be obtained through coating and drying.

  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. 8 is a diagram illustrating an authenticity determination body of the present invention to which the authenticity determination medium 1 as described above is applied. The authenticity determination body 19 in this example is obtained by laminating the authenticity determination body 1 on the base material 20, and the authenticity determination medium 1 includes the adhesive layer A (reference numeral 8A) and the base material from the base material 20 side. The material sheet 7, the thin film layer 6, the adhesive layer B (reference numeral 8B), the transparent pattern layer 4, the unevenness 3, and the transparent sheet 2 are laminated.

  The base material 20 can be, for example, a high-priced product with high economic value as exemplified in the background art or a credit card, a voucher, or the like that can generate value by being used as an ID means. It can also be various.

  For example, printer consumables, electronic devices, electrical devices, computer products, pharmaceuticals, or chemicals that require genuine product authentication. Luxury brand products such as watches, clothing, bags, jewelry, sporting goods or cosmetics. ID card, for example, passport, driver's license, insurance card, book card, etc., gold certificate, for example, gift certificate, gift certificate, prepaid card, etc. These listed materials can be the above-described base material 20, but a storage container or a packaging material for storing or packaging them may be used as the base material 20 as necessary.

  As described above, when the authenticity determination medium 1 of the present invention is applied to the target base material 20, the authenticity determination medium 1 may be in the form of a label in which an adhesive layer to be attached is previously laminated on the authenticity determination medium 1, or true It is preferable to prepare and use a transfer sheet in the form of a transfer sheet for transferring the false determination medium 1.

  FIG. 2 illustrates a laminated structure of the authenticity determination medium label 9 that is preferably used for such a purpose. From the upper side of the figure, the transparent sheet 2, the unevenness 3, the transparent pattern layer 4, and the adhesive layer B (symbol 8B), thin film layer 6, substrate sheet 7, and adhesive layer A (symbol 8A) have a laminated structure in order, but the authenticity determination basically described with reference to FIG. What is necessary is just to have an adhesive layer laminated on the opposite side of the transparent sheet 2 of the medium 1. In the example described with reference to FIG. 2, the adhesive layer B (reference numeral 8B) is interposed between the thin film layer 6 and the upper layer, and may be configured using a heat-sensitive adhesive or a pressure-sensitive adhesive. However, it can be omitted when the thin film layer 6 can be formed directly on the lower surface side of the upper layer. Further, as described above, the base sheet 7 can also be omitted. The lowermost adhesive layer B (symbol 8B) in the example described with reference to FIG. 2 is for adhering the authenticity determination medium label 9 to the target substrate 20, and is a heat-sensitive adhesive or sensitive material. Although it can be configured using a pressure adhesive, it is preferably configured using a pressure-sensitive adhesive, specifically a pressure-sensitive adhesive, which can basically be bonded by applying pressure.

  Adhesives include acrylic resins, acrylate resins or copolymers of these resins, styrene / butadiene copolymers, natural rubber, casein, gelatin, rosin esters, terpene resins, phenolic resins, styrene resins, and polymers. Made of malon indene resin, polyvinyl ether resin, silicone resin, α-cyanoacrylate resin, silicone resin, maleimide resin, styrene resin, polyolefin resin, resorcinol resin, polyvinyl ether resin, silicone resin, etc. Things can be mentioned. In addition, when using an adhesive, it is preferable to laminate a release sheet for protecting the adhesive layer on the exposed surface of the adhesive layer, and as the release sheet, a release treatment is applied to paper or a plastic film as necessary. The applied one can be used.

  FIG. 3 exemplifies the laminated structure of the authenticity determination medium transfer sheet 10, and from the upper side of the figure, the peelable sheet 7A, the transparent sheet 2, the unevenness 3, the transparent pattern layer 4, the thin film layer 6, and the base material sheet. 7 and the adhesive layer 8A are laminated in order. Basically, a peelable sheet 7A is laminated on the transparent sheet 2 side of the authenticity determination medium 1 described with reference to FIG. If it is. As in the example described with reference to FIG. 2, the adhesive layer B (reference numeral 8B) is interposed between the thin film layer 6 and the upper layer, and is configured using a heat-sensitive adhesive or a pressure-sensitive adhesive. However, it can be omitted when the thin film layer 6 can be formed directly on the lower surface side of the upper layer. Further, as described above, the base sheet 7 can also be omitted. The lowermost adhesive layer 8A in the example described with reference to FIG. 3 is for sticking the authenticity determination medium to the target substrate 20, and uses a heat-sensitive adhesive or a pressure-sensitive adhesive. Can be configured. When an adhesive is applied to the surface of the substrate 20 to be transferred, the adhesive layer 8A in the transfer sheet 10 may be omitted. The peelable sheet 7A can be selected from the same material as the transparent sheet 2 in consideration of the adhesiveness with the layer to be laminated, and if necessary, a release agent such as wax or silicone can be used. The peelable layer blended in the binder resin may be laminated on the surface on which the authenticity determination medium is laminated.

  An ultraviolet curable resin liquid and a concave-convex 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. The cross section is a right triangle, and the pitch is 50 μm and the height is 25 μm. An uneven sheet having an uneven shape in which a large number of prisms are arranged was prepared. On the side having the concavo-convex shape of this concavo-convex sheet, a pattern printing corresponding to a negative pattern of characters and symbols is performed by filling the concave portion and flattening the surface by a silk screen printing method, thereby having the concavo-convex shape of the concave-convex sheet When viewed from the side opposite to the side, a pattern sheet was obtained in which characters and symbols were seen as a reflection pattern.

  In addition to the above, after applying a polyester resin-based heat-sensitive adhesive to a thickness of 5 μm on the aluminum deposited film side of the PET film with an aluminum deposited film having a thickness of 25 μm, the pattern of the pattern sheet obtained above Thermal lamination was performed on the printed surface side using a heat-sensitive adhesive. Thermal lamination was performed by passing between heated nip rollers under conditions of roller heating temperature: 150 ° C., speed: 0.8 m / min. After heat lamination, a pressure-sensitive adhesive layer and a release sheet were laminated on the exposed surface of the obtained PET film having a thickness of 25 μm to form a label.

  A product in which the aluminum vapor deposition layer of the obtained label is irradiated with laser light as described with reference to FIG. 5, and the label is attached as a visible recording portion to the aluminum vapor deposition film by a collection of dot-like removed portions. The ID number is recorded, and the ID number linked with the product ID number is recorded by the method using a parallel line as described with reference to FIG. 7 as the invisible recording portion, and the reflection pattern obtained previously is recorded. A pattern (character and symbol pattern, that is, a positive pattern) having the same shape was formed.

  After performing the above processing, the release sheet of the label was peeled off and attached to the surface of a toner container for a computer printer. After pasting, when a discriminating tool composed of a single line as described with reference to FIG. 7 was stacked, the invisible recording portion was visualized and reading could be performed.

It is a figure which shows the laminated structure of an authenticity determination medium. It is a figure which shows a authenticity determination medium sticking label. It is a figure which shows an authenticity determination medium transfer sheet. It is a figure which shows the pattern based on the unevenness | corrugation of a authenticity determination medium, and a transparent pattern. It is a figure which shows a mode that a recording part is formed in a thin film layer. It is a figure explaining the pattern of a true / false determination medium and a recording part. It is a figure which shows the mode of discrimination | determination of 18 A of invisible recording parts using a discrimination tool. It is a figure which shows the authenticity determination body to which an authenticity determination medium is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Authenticity determination medium 2 ... Transparent sheet 3 ... Concavity and convexity 4 ... Transparent pattern layer 5 ... Air 6 ... Thin film layer 7 ... Base material sheet 8 ... Adhesive layer 9 ... Authenticity determination medium Adhesive label 10 ... authenticity determination medium transfer sheet 13 ... reflective part 18 ... recording part 19 ... authenticity determination body

Claims (6)

  The transparent sheet has irregularities on one side, and has a laminated structure in which a transparent pattern layer that fills the irregularities in a pattern and a thin film layer in which light transmittance or light reflectance is changed by heating are sequentially laminated. The thin film layer has a recording section made of a hidden pattern based on the difference in light transmittance or the difference in light reflectance.   The authenticity determination medium according to claim 1, wherein the shape of the unevenness is a surface shape when prisms having a triangular cross section are closely arranged.   The said thin film layer is laminated | stacked on the base material sheet different from the said transparent sheet, and comprises the laminated sheet, The said laminated sheet is laminated | stacked with the said transparent pattern layer. The authenticity determination medium described.   The authenticity determination medium sticking label characterized by the adhesive layer being laminated | stacked on the surface on the opposite side to the said transparent sheet side of the said laminated structure in any one of Claims 1-3.   An authenticity determination medium transfer sheet, wherein a peelable sheet is laminated on the transparent sheet side of the laminated structure according to any one of claims 1 to 3. An authenticity determination body, wherein the authenticity determination medium according to any one of claims 1 to 3 is laminated on a base material.