JP5621308B2 - Anti-counterfeit media - Google Patents

Description

  The present invention relates to an anti-counterfeit medium and a forgery-preventing transfer foil that are transferred to the article and used to prove the authenticity of securities or certificates.

  Conventionally, various anti-counterfeit media that are difficult to forge are attached to articles such as lottery tickets, gift certificates, membership cards, and credit cards in order to prevent forgery. Examples of the anti-counterfeit medium include optical variable elements (OVD) such as special inks and holograms that cause a color change (color shift) depending on the observation angle. These OVDs express a unique optical effect using a light interference phenomenon, a diffraction phenomenon, or the like, and can easily determine the authenticity by visual observation.

  However, recently, with the advancement of counterfeiting technology, there is a problem that it is easy to manufacture counterfeit products that are almost indistinguishable from genuine products, and authenticity determination becomes difficult. In particular, specific information (personal information, data, numbers, etc.) held by an article with anti-counterfeit media attached by a method such as sticking a medium such as a seal with falsification information directly above the anti-counterfeit media If tampering is performed, it is difficult to determine the authenticity.

  In order to solve this problem, as another method for distinguishing between the genuine article and the bowl, for example, a configuration in which a printing layer having an information pattern made of an ultraviolet light emitting type fluorescent ink is provided (see Patent Document 1), or an infrared light absorbing material. The structure (refer patent document 2) which provided the printing layer which has the information pattern which consists of is proposed. In these configurations, it is possible to determine the authenticity by a method of irradiating ultraviolet light or infrared light, which is invisible light, and observing the presence or absence of light emission or light absorption. However, since a device that emits ultraviolet light or infrared light or the like is required for authenticity determination, authenticity determination is difficult except in situations where such devices can be used.

JP-A-7-199783 Japanese Laid-Open Patent Publication No. 2007-136907

  The present invention aims to solve the above problems. That is, an object of the present invention is to provide a forgery prevention medium that can be easily visually confirmed without requiring a special device for confirming whether or not the information is falsified with respect to specific information held by an article. Another object of the present invention is to provide an anti-counterfeit transfer foil and an anti-counterfeit article obtained by converting the transfer foil into a transfer foil.

  In order to solve the above problems, the invention according to claim 1 is a forgery prevention medium having a first diffractive structure on one surface of a diffractive structure forming layer and a second diffractive structure on the other surface, The anti-counterfeit medium is characterized in that the first diffractive structure is exposed in the air and the second diffractive structure side is coated with an adhesive layer.

  Since the present invention is configured as described above, the following effects can be obtained.

  That is, according to the first aspect of the present invention, when the anti-counterfeit medium according to the present invention is attached to the first diffractive structure side with the tamper-proof seal, the first diffracted light exposed to the viewer side is observed. In the structure, the difference in refractive index near the diffraction structure in the portion where the seal is attached becomes small, and the optical effect disappears. The observer can easily confirm the presence or absence of information falsification by visually confirming a portion where the optical effect of the diffractive structure disappears and cannot be observed.

It is a top view which shows the 1st example of this invention. It is a figure of the sectional view in the AA line of FIG. 1 which shows the 1st example of this invention. It is sectional drawing which shows the 2nd example of this invention. It is sectional drawing which shows the 3rd example of this invention. It is a top view which shows the 4th example of this invention. It is a figure of the sectional view in the BB line of Drawing 4 showing the 4th example of the present invention. It is a top view which shows the effect by this invention, and is a figure explaining the state before sticking the falsification information seal | sticker 15 on the forgery prevention article 12. FIG. It is a top view which shows the effect by this invention, and is a figure explaining the state after sticking the falsification information seal | sticker 15 on the forgery prevention article 12. FIG. It is sectional drawing which shows the effect by this invention, and is a figure of the sectional view in CC line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a first example of the present invention, and shows a plan view of a transfer foil 1 observed from a vertical upper surface direction. The transfer foil 1 has a first diffractive structure 2 and a second diffractive structure 3 (hereinafter referred to as a first diffractive structure and a second diffractive structure).

  FIG. 2 is a cross-sectional view according to the first example of the present invention, and is a cross-sectional view taken along line AA of FIG. The transfer foil 1 includes a support 5 and a transfer layer 7, and the transfer layer 7 includes a diffraction structure forming layer 4 and an adhesive layer 6. Further, the diffractive structure forming layer 4 forms the first diffractive structure 2 on a part of the support 5 side and the second diffractive structure 3 on a part of the adhesive layer 6 side. The transfer foil 1 is affixed to a predetermined article by the adhesive layer 6, the support 5 is peeled off, and the remaining transfer layer 7 is used as an anti-counterfeit article.

  FIG. 3 is a sectional view showing a second example of the present invention. The transfer foil 101 includes a support 5 and a transfer layer 701, and the transfer layer 701 includes a diffraction structure forming layer 4, a second refractive index changing layer 8, and an adhesive layer 6. Furthermore, the diffractive structure forming layer 4 forms the first diffractive structure 2 on a part of the support 5 side, and forms the second diffractive structure 3 on a part of the second refractive index changing layer 8 side. By providing the second refractive index change layer 8, the optical effect by the second diffractive structure 3 is enhanced and the forgery prevention effect is improved.

  FIG. 4 is a sectional view showing a third case of the present invention. The transfer foil 102 has a support 5 and a transfer layer 702, and the transfer layer 702 is bonded to the partially provided first refractive index changing layer 19, diffraction structure forming layer 4, and second refractive index changing layer 8. It consists of layer 6. Further, the diffractive structure forming layer 4 forms the second diffractive structure 3 on a part of the second refractive index changing layer 8 side, and forms first diffractive structures 201 and 202 on a part of the support 5 side. The first refractive index changing layer 19 is provided in contact with the first diffractive structure 201, but the first refractive index changing layer 19 is not provided on the first diffractive structure 202 side. By providing the first refractive index changing layer 19, the optical effect of the first diffractive structure 201 is enhanced and the forgery prevention effect is improved.

  FIG. 5 is a plan view showing a fourth example of the present invention, and is a plan view of the forgery prevention article 12 observed from the vertical direction. When the transfer foil 101 having the cross section of FIG. 3 is transferred to the article 9 provided with the information 10 “CAP” on the medium 11 and the support 5 is removed, the transfer layer 701 is attached to the article 9, and the first The diffractive structure 2, the second diffractive structure 3, and the information 10 "CAP" are observed.

  FIG. 6 is a cross-sectional view showing a fourth example of the present invention, and shows a BB cross section in FIG. The transfer layer 701 is transferred to the article 9 composed of the medium 11 and the information display layer 13. The transfer layer 701 includes an adhesive layer 6, a second refractive index changing layer 8, and a diffractive structure forming layer 4 in order from the article 9 side. The diffractive structure forming layer 4 forms the second diffractive structure 3 on a part of the second refractive index changing layer 8 side, and forms the first diffractive structure 2 on a part of the side opposite to the second refractive index changing layer 8. doing.

  FIG. 7 is a plan view showing the effect of the present invention, and shows a state before the falsification information seal 15 is attached to the surface of the anti-counterfeit article 12 shown in FIG. The falsification information seal 15 has falsification information 14 “GAP”, and considers a case where the information 10 “CAP” of the anti-counterfeit article 12 is falsified.

  FIG. 8 is a plan view showing the effect of the present invention, and shows a state after the falsification information seal 15 is pasted on the anti-counterfeit article 12 shown in FIG. When a falsification information seal 15 having falsification information 14 “GAP” is affixed to the medium 11, the optical effect of the portion of the first diffractive structure 2 where the falsification information seal 15 is affixed is lost and observed. It becomes impossible. On the other hand, there is no change in the optical effect of the second diffractive structure 3. The observer can easily confirm the presence or absence of information falsification by observing the disappearance of the optical effect of the first diffractive structure 2.

  FIG. 9 is a cross-sectional view showing the effect of the present invention, showing the CC cross section in FIG. 8, and a tamper information seal 15 is further attached to the article 9 to which the transfer layer 701 has been transferred. Represents a state. The falsification information seal 15 includes a base material 16, a falsification information display layer 18, and an adhesive layer 17, and the transfer layer 701 includes a diffractive structure forming layer 4 having a first diffractive structure 2 and a second diffractive structure 3, and a second. It consists of a refractive index changing layer 8 and an adhesive layer 6. Further, the article 9 includes a medium 11 and an information display layer 13. By attaching the falsification information seal 15, the unevenness of the first diffractive structure 2 is filled with the adhesive layer 17, and the optical effect of the first diffractive structure 2 disappears.

  Hereinafter, each layer will be described in detail.

(Support)
As the support 5, it is common to use a polyethylene terephthalate resin film having a stable thickness and high heat resistance, but is not limited thereto. As other materials, polyethylene naphthalate resin films, polyimide resin films, and the like are known as films having high heat resistance, and can be used for the same purpose. In addition, other films such as polyethylene, polypropylene, and heat-resistant vinyl chloride can be used. Further, the support 5 may be subjected to processing such as antistatic processing, mat processing, emboss processing, and the like.

(Diffraction structure forming layer)
The diffractive structure forming layer 4 is a layer that exhibits an optical effect due to diffraction. The main material may be any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray or an electron beam curable resin, for example, an acrylic resin, an epoxy resin, a cellulose resin, a vinyl resin, or the like. Addition of polyisocyanate as a crosslinking agent to acrylic resins and polyester polyols with reactive hydroxyl groups, crosslinked urethane resins, thermosetting resins such as melamine resins and phenolic resins, epoxy (meth) acrylic, urethane Ultraviolet rays such as (meth) acrylate or electron beam curable resins can be used alone or in combination. Moreover, even if it is resin other than the above, if a diffraction structure can be formed, it can be used suitably.

(Refractive index change layer)
The first refractive index changing layer 2 and the second refractive index changing layer 3 are layers provided to reflect a part of visible light incident on the diffractive structure forming layer 4 and enhance the optical effect of the diffractive structure. As a material used, for example, a material having a high refractive index such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , ZnS, or Al, Sn, Cr, Ni, Cu, Au or the like having a high light reflection effect is used. The metal material is mentioned. The film thickness is preferably 10 to 500 nm, and a forming method such as a vacuum evaporation method or a sputtering method is used.

  Although the refractive index changing layer may be provided on the entire surface, it may be provided partially in a shape such as a character or a pattern. In this case, since the design property is improved and the processing becomes complicated, a higher forgery prevention effect can be imparted.

As a method of partially providing the refractive index changing layer, a method in which a soluble resin is partially formed and then a refractive index changing layer is provided, and the soluble resin and the refractive index changing layer of the part are washed and removed. A method of etching a metal thin film with an acid or alkali, or exposing to light after a metal thin film layer is used as a refractive index changing layer and a metal thin film layer is partially provided with an acid resistant or alkali resistant resin. In this method, a resin material that is dissolved or hardly dissolved is applied, exposed through a mask having a desired pattern shape, and then unnecessary portions are removed by washing or etching. The above is an example, and the present invention is not limited to these, and known techniques can be used as appropriate.

(Adhesive layer)
The adhesive layer 6 is provided so that the anti-counterfeit transfer foil of the present invention can be transferred to an article that requires anti-counterfeiting. As the main material, polyester resin, urethane resin, acrylic resin, vinyl chloride resin, or the like is preferably used. As a method for providing the adhesive layer 6, a known method such as a gravure printing method or a screen printing method is appropriately used.

  The present invention will be described in detail with reference to specific examples.

  The first diffractive structure 2 was formed on one side of the support 5 made of a transparent polyethylene terephthalate film having a thickness of 25 μm by embossing with heat (about 250 ° C.) and pressure.

  Next, on the side of the support 5 on which the first diffractive structure 2 is formed, as the diffractive structure forming layer 4, a composition having the following blending ratio is applied by a gravure printing method at a coating thickness of 1 μm and a drying temperature of 110 ° C. Formed.

(Diffraction structure forming layer)
25 parts of a mixture of vinyl chloride-vinyl acetate copolymer and urethane resin
70 parts of methyl ethyl ketone
30 parts of toluene

  Next, the diffractive structure forming layer 4 was embossed with heat (about 150 ° C.) and pressure to form the second diffractive structure 3.

  Next, as the second refractive index changing layer 8, a 30 nm-thickness ZnS thin film layer was provided on the entire surface by vacuum evaporation.

  Finally, the adhesive layer 6 was formed by applying a composition having the following blending ratio by a gravure method at a coating thickness of 4.0 μm and a drying temperature of 110 ° C.

(Adhesive layer)
20 parts acrylic resin
5 parts vinyl chloride vinyl acetate copolymer resin
50 parts of toluene
50 parts of methyl ethyl ketone

  The anti-counterfeit transfer foil 101 produced as described above was transferred to an article 9 in which information 10 “CAP” was provided on the medium 11, and the support 5 was removed to obtain an anti-counterfeit article 12.

  When the falsification information seal 15 having the falsification information 14 “GAP” is attached to the information 10 “CAP” of the manufactured anti-counterfeit article 12, the optical effect of the second diffractive structure 3 is not changed. In the first diffractive structure 2, it was confirmed that the optical effect of the portion where the falsification information seal 15 was affixed was lost and the observation was impossible. The above effects make it possible to easily confirm the presence or absence of information falsification visually.

As described above, according to the present invention, anti-counterfeiting transfer foil that does not require special equipment for confirming the presence or absence of falsification with respect to specific information held by an article and is easy to check visually, and forgery Preventive articles can be produced.

DESCRIPTION OF SYMBOLS 1, 101, 102 ... Transfer foil 2, 201, 202 ... 1st diffraction structure 3 ... 2nd diffraction structure 4 ... Diffraction structure formation layer 5 ... Support body 6 ... Adhesive layer 7, 701, 702 ... Transfer layer 8 ... 2nd Refractive index change layer 9 ... article 10 ... information 11 ... medium 12 ... anti-counterfeit article 13 ... information display layer 14 ... falsification information 15 ... falsification information seal 16 ... base material 17 ... adhesive layer 18 ... falsification information display layer 19 ... first One-refractive-index changing layer 20 ... Diffraction difference of diffraction structure

Claims (1)

  An anti-counterfeit medium having a first diffractive structure on one surface of a diffractive structure forming layer and a second diffractive structure on the other surface, wherein the first diffractive structure is exposed in the air, and the second diffractive structure An anti-counterfeit medium characterized in that an adhesive layer is coated on the side.

Images