JP4358046B2 - Authenticity determination medium, authenticity determination medium affixing label, authenticity determination medium transfer sheet, and authenticity determination body - Google Patents

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 plurality of prisms with a triangular cross section arranged on the back surface is used, and the uneven surface is patterned with a material whose refractive index is almost similar to the material of the prism sheet. When observing from the side without unevenness, light is transmitted through the part where the surface of the unevenness 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 or 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, aluminum or copper that can be recorded by opening holes with a laser beam or the like on a conventional prism sheet in which a pattern filling the unevenness of the uneven surface is formed. Laminate a heat-sensitive recording layer, etc., record through the aperture, and further laminate a layer made of a fluorescent material that emits fluorescence when irradiated with ultraviolet rays, etc. It has been found that the presence or absence of the fluorescent light emitting layer can be confirmed by irradiating the light, and it has been found that tampering can be made even more difficult, and the present invention has been achieved.

  1st invention which solves a subject consists of a reflective pattern sheet on which the transparent pattern layer which has an unevenness on the back side of a transparent sheet, the transparent pattern layer which fills the unevenness in a pattern shape was laminated, and a material opened by heating The present invention relates to an authenticity determination medium characterized in that a heat-sensitive recording layer is laminated, and a fluorescent light-emitting layer containing a fluorescent material is laminated on the back side of the reflective pattern sheet and the heat-sensitive recording layer. is there.

  A second invention relates to a true / false determination medium according to the first invention, wherein the thermosensitive recording layer, the reflective pattern sheet, and the fluorescent light emitting layer are laminated in this order.

  3rd invention is related with the authenticity determination medium sticking label characterized by the adhesive layer being laminated | stacked on the said fluorescence light emitting layer side of the said authenticity determination medium of 1st or 2nd invention. .

  4th invention is the authenticity determination medium characterized by having a peelable sheet laminated on the opposite side to the fluorescent light emitting layer of the authenticity determination medium of the 1st or 2nd invention laminated. It relates to a transfer sheet.

  According to a fifth aspect of the present invention, there is provided a true / false determination object characterized in that the authenticity determination medium of the first or second invention is laminated.

  According to the first invention, a heat-sensitive recording layer capable of recording by opening with a laser beam or the like is laminated on a reflective pattern sheet in which the irregularities of a transparent sheet having irregularities are embedded in a pattern. In addition, since the fluorescent light emitting layer is further laminated on the back surface, the presence or absence of the fluorescent light emitting layer that can be seen from the opening can be confirmed by fluorescent light emission, and a forgery determination medium having high anti-counterfeiting properties is provided. Can do.

  According to the second invention, since the heat-sensitive recording layer, the reflective pattern sheet, and the fluorescent light-emitting layer are laminated in the order described, in addition to the effects of the first invention, the heat-sensitive recording layer can be formed on a flat surface, In addition, since the heating at the time of recording on the heat-sensitive recording layer can be performed directly, it is possible to provide an authenticity determination medium capable of improving the printing performance.

  According to the third invention, since the adhesive layer is laminated on the fluorescent light emitting layer side of the authenticity determination medium having the effects of the first or second invention, it can be applied as it is to other articles by pasting. An easy authenticity determination medium sticking label can be provided.

  According to the fourth invention, since the peelable sheet is laminated on the opposite side of the fluorescent light emitting layer of the authenticity determination medium having the effect of the first or second invention, the other article Therefore, it is possible to provide a true / false determination medium transfer sheet that can be easily applied by transfer.

  According to the fifth invention, since the authenticity determination medium having the effects of the first or second invention is applied on the base material, it is possible to provide an authenticity determination body that is easy to determine authenticity. .

  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 how the recording portion is formed in the heat-sensitive recording 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 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 has a large number of triangular prisms on the entire lower surface of the transparent sheet 2 having a cross section of an inverted regular triangle from the labor side to the back side in the figure. The unevenness 3 formed in an array is provided, and the lower surface of the unevenness 3 is laminated with a transparent pattern layer 4 that fills the unevenness 3 in a pattern. The transparent sheet 2 is made of a material that is opened by heating on the upper surface in the drawing. A heat-sensitive recording layer 6 is laminated, and a fluorescent light emitting layer 7 containing a fluorescent material is covered by covering the lower surface of the transparent pattern layer 4 in a portion with the transparent pattern layer 4 and covering the lower surface of the unevenness 3 in a portion without the transparent pattern layer. It is a laminated one. Air exists between the lower surface of the unevenness 3 and the fluorescent light emitting layer 7 in a portion where the transparent pattern layer 4 on the lower surface of the unevenness 3 is absent.

  As shown in FIG. 1 (b), the authenticity determination medium 1 of the present invention is such that the heat-sensitive recording layer 6 in the laminated structure described with reference to FIG. Then, it may be laminated so as to cover the lower surface of the transparent pattern layer 4 and the lower surface of the unevenness 3 in a portion without the transparent pattern layer. In this case, the fluorescent light emitting layer 7 is laminated on the lower surface of the thermosensitive recording layer 6.

  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 heat-sensitive recording layer 6 laminated in addition to the transparent sheet 2, the unevenness 3, and the transparent pattern layer 4 is opened by heating. By doing so, recording can be performed. The heat-sensitive recording layer 6 will be described later, but the thickness is 1 μm or less.

  As illustrated in FIG. 5, the laser light 16 emitted from the laser light source 15 is irradiated through the lens 17 so as to be condensed on the heat-sensitive recording layer 6 of the authenticity determination medium 1, so that the heat-sensitive recording is performed in the light-collecting portion. Layer 6 can be perforated. For example, the heat-sensitive recording layer 6 is removed by evaporation or the like with the laser light 16 in the light condensing portion, thereby generating a through hole having a fine diameter. By generating such a through hole based on input information, the recording unit 18 can be formed. Recording on the heat-sensitive recording layer 6 can also be performed by a point-like heating means by direct heat conduction such as a thermal head. In addition, when recording is performed by making holes by direct heat conduction such as a thermal head for recording, is the thermal recording layer exposed on the surface as described with reference to FIG. It is preferable to use the authenticity determination medium 1 having a laminated structure very close to the surface.

  The laser beam used for recording on the thermosensitive recording 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 a number or the like is recorded by the recording unit 18. In both FIG. 6 (a) and FIG. 6 (b), along the upper side and the lower side in the drawing of the authenticity determination medium 1. The thermal recording layers 6 and 6 are laminated in the left-right direction, and the recording section 18 having the number “0001234” is formed in the thermal recording layer 6 laminated along the lower side. Further, in both FIG. 6A and FIG. 6B, in the portion between the two thermosensitive recording 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 as described with reference to FIGS. 4A and 4B, and in the portion between the two thermal recording layers 6 and 6, the thermal recording layer 6 is completely removed. Yes. 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. Thus, when the difference in reflection between the reflecting portion 13 and the non-reflecting portion 14 is small, the transparency of the lower layer is increased. Therefore, if the lower layer is colored, the reflecting portion 13 and the non-reflecting portion are displayed. Part 14 appears colored.

  As described above, the authenticity determination medium 1 of the present invention can visually recognize the reflective pattern by the reflection of light based on the presence of the reflecting portion 13 and can also record the recording portion 18 formed on the heat-sensitive recording layer 6. Therefore, for example, by recording a number or the like in the recording unit 18, tampering can be made more difficult, and the information corresponding to the ID number is listed in advance by using the recorded number as an ID number. Accordingly, it is possible to perform collation of the product details, history, etc. using the ID number as an index. Alternatively, if a bar code is recorded in the recording unit 18, it is possible to manage distribution by reading the bar code and collating data previously associated with the bar code. Further, 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 thermosensitive recording layer 6 having a thickness of 1 μm or less. It is suitable for sticking to various target articles.

  As described with reference to FIG. 1, the authenticity determination medium 1 of the present invention has a fluorescent light emitting layer 7 containing a fluorescent material on the back side. It can be seen that the fluorescent light-emitting layer 7 is present from the opening portion formed in the recording portion 18 of the layer 6. Therefore, from the heat-sensitive recording layer 6 side of the recording unit 18, for example, it is possible to excite the fluorescent luminescent material in the fluorescent light emitting layer 7 by irradiating ultraviolet rays and observe the generated fluorescent light emission. Depending on whether or not, it is possible to make a true / false judgment.

  The transparent sheet 2 constituting the authenticity determination medium 1 is a target 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 it 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.

  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 thermosensitive recording layer 6 may be made of any material as long as it is a material that is opened 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), palladium (Pd), or other single metal, or an alloy of these metals to form the thermosensitive recording layer 6. Can do. The heat-sensitive recording layer 6 composed of these metals or alloys is irradiated with laser light or heated using a point-like heating means such as a thermal head, so that the heated portion is melted or evaporated. A through hole penetrating the thermosensitive recording layer 6 is generated.

  Examples of the method for forming the thermosensitive recording layer 6 with the metal or alloy as described above include a thin film forming method such as a vacuum deposition method, a sputtering method, or an ion plating method. The thickness of the thermosensitive recording layer 6 is as follows. 50 to 1 μm is preferable, and 100 to 1000 μm is more preferable. When the heat-sensitive recording layer 6 has transparency, the thickness is preferably 200 mm or less, and when the heat-sensitive recording layer 6 has concealability, the thickness is preferably 200 mm or more.

  The fluorescent light-emitting layer 7 is an organic fluorescent light-emitting substance or inorganic fluorescent light-emitting substance that absorbs ultraviolet rays and emits visible light such as red, blue, or green, and preferably uses a colorless fluorescent light-emitting substance, It is a layer composed by dissolving or dispersing in a binder resin. Therefore, the appearance of the fluorescent light-emitting layer 7 is usually colorless or white except for the opening portion generated by recording on the heat-sensitive recording layer 6, and at first glance, it does not seem to have any meaning. When the fluorescent light emitting layer 7 is irradiated with a predetermined ultraviolet ray through the opening of the thermosensitive recording layer 6, fluorescent light emission having a wavelength peculiar to the blended fluorescent material is obtained. Can be confirmed. The function provided by the fluorescent light-emitting layer 7 is that it cannot be discriminated in the visible light region but can be discriminated in a region other than the visible light region. Even if an agent is blended, discrimination outside the visible light region can be made possible. The fluorescent light-emitting layer 7 or the layer containing the infrared absorber or the ultraviolet absorber may be colorless or white, but may be appropriately colored. You can also. Further, by coloring, it is possible to make the fluorescent light emitting layer 7 inconspicuous excluding the hole portion of the thermosensitive recording layer 6. The coloring may be performed by stacking a colored layer on the lower layer side without performing the coloring on the fluorescent light emitting layer 7 or the like.

  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. 7 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 9, the base material sheet 2A, and the like from the base material 20 side. The fluorescent light emitting layer 7, the transparent pattern layer 4, the unevenness 3, the transparent sheet 2, and the thermosensitive recording layer 6 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, 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 8 that is preferably used for such a purpose. From the upper side of the figure, the thermal recording layer 6, the transparent sheet 2, the unevenness 3, the transparent pattern layer. 4, the fluorescent light emitting layer 7, the base material sheet 2A, and the adhesive layer 9 are laminated in order, but basically the transparent sheet 2 of the authenticity determination medium 1 described with reference to FIG. May be any layer having an adhesive layer laminated on the opposite side. In the example described with reference to FIG. 2, the fluorescent light emitting layer 7 is backed by the base material sheet 2A on the lower side, and in this way, the fluorescent light emitting layer 7 is laminated on the flat base material sheet 2A. After the formation, the transparent light emitting layer 7 can be laminated on the lower surface of the irregularities 3 on which the transparent pattern layer 4 is laminated, and the fluorescent light emitting layer 7 is configured using a binder resin having heat-sensitive adhesiveness for the purpose of smooth lamination. Preferably it is. The lowermost adhesive layer 9 in the example described with reference to FIG. 2 is for adhering the authenticity determination medium label 8 to the target substrate 20, and a heat-sensitive adhesive or a pressure-sensitive adhesive is used. However, it is preferable to use a pressure-sensitive adhesive that can be bonded by applying pressure, specifically, a pressure-sensitive adhesive.

  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. From the upper side of the figure, the peelable sheet 2 </ b> B, the thermosensitive recording layer 6, the transparent sheet 2, the unevenness 3, the transparent pattern layer 4, and the fluorescence emission. The layer 7, the base sheet 2A, and the adhesive layer 9 are laminated in this order, but basically, the side opposite to the fluorescent light emitting layer 7 of the authenticity determination medium 1 described with reference to FIG. What is necessary is just to have the peelable sheet 2B laminated thereon. As in the example described with reference to FIG. 2, the fluorescent light emitting layer 7 is backed by the base material sheet 2A on the lower layer side. By doing so, the fluorescent light emitting layer 7 is flattened by the flat base material sheet 2A. After being laminated, the transparent pattern layer 4 can be laminated on the lower surface of the irregularities 3. At this time, it is preferable that the fluorescent light-emitting layer 7 is configured using a binder resin having heat-sensitive adhesiveness for the purpose of smooth lamination. The lowermost adhesive layer 9 in the example described with reference to FIG. 3 is for sticking the authenticity determination medium to the target base material 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 9 in the transfer sheet 10 may be omitted. The releasable sheet 2B can be selected from the same material as the transparent sheet 2 in consideration of the adhesiveness with the layer to be laminated. 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 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. Next, an Sn thin film having a thickness of 200 mm was formed on the side opposite to the side having the concavo-convex shape of the concavo-convex sheet by a vapor deposition method. Then, a pattern corresponding to a negative pattern of characters and symbols by filling the concave portion and flattening the surface by a silk screen printing method using a polyester binder resin transparent ink on the concave and convex side of the concave and convex sheet. Printing was performed to obtain a pattern sheet in which characters and symbols were seen as a reflection pattern when viewed from the opposite side of the uneven sheet having the uneven shape.

  Subsequently, on the pattern printed side of the pattern sheet, using a heat-sensitive adhesive layer forming ink containing an ultraviolet fluorescent material that emits green fluorescent light by ultraviolet irradiation in a polyester binder resin, the thickness is A 5 μm heat-sensitive adhesive layer was formed, and a PET film having a thickness of 25 μm was heat-laminated using the formed heat-sensitive adhesive layer. Thermal lamination was performed by passing between heated nip rollers under conditions of roller heating temperature: 150 ° C., speed: 0.8 m / min. After thermal lamination, a yellow colored adhesive layer and a release sheet were laminated on the exposed surface of the PET film having a thickness of 25 μm to form a label.

  As shown in FIG. 5, the thin Sn film of the obtained label was irradiated with laser light, and as shown in FIG. 6, the label was attached to the Sn vapor deposition film by a collection of dot-like removed portions. The ID number of the product to be recorded was recorded, and in the central region of the label having the reflection pattern obtained earlier, the reflective portion 13 and the Sn deposited thin film around it were removed.

  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.

  The affixed label looked silvery due to total reflection of the reflection pattern of the pattern sheet when viewed from the front, that is, the normal direction, and changed yellow when the angle was changed. Further, when the black light was irradiated, the lower layer on which the ID number was recorded emitted green light, and the authenticity of the label could be determined.

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 thermosensitive recording 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 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 ... Thermal recording layer 7 ... Base material sheet 8 ... Adhesive layer 9 ... Authenticity determination Label for medium sticking 10 ... Authenticity determination medium transfer sheet 13 ... Reflection portion 18 ... Recording portion 19 ... Authenticity determination body

Claims (5)

  The back side of the transparent sheet has irregularities, a reflective pattern sheet laminated with a transparent pattern layer that fills the irregularities in a pattern, and a thermal recording layer made of a material that is opened by heating is laminated, An authenticity determination medium, characterized in that a fluorescent light-emitting layer containing a fluorescent material is laminated on the back side of the reflective pattern sheet and the thermosensitive recording layer.   The authenticity determination medium according to claim 1, wherein the heat-sensitive recording layer, the reflection pattern sheet, and the fluorescent light-emitting layer are laminated in this order.   An authenticity determination medium sticking label, wherein an adhesive layer is laminated on the fluorescent light emitting layer side of the authenticity determination medium according to claim 1.   The authenticity determination medium transfer sheet, wherein a peelable sheet is laminated on a side opposite to the fluorescent light emitting layer of the authenticity determination medium 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.