JP2012144011A - Tamper proof medium, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve high forgery prevention effects by providing: a medium that does not allow additional writing by a laser beam in order to prevent tampering; and a method for manufacturing the same.SOLUTION: A tampering proof medium is composed of: a laminated base material composed of at least three layers of a surface base material transmitting a laser beam, a core base material to be carbonized by a laser beam, and a rear-surface base material; and an OVD (optical variable device) transfer body having a layer colored or discolored by light irradiation with an intensity exceeding a specific intensity. The tamper proof medium is configured to record image information and character information in the core base material by laser beam irradiation without affecting the surface base material. The transfer body is provided on the surface of the laminated base material in which image information and character information are recorded in the core base material.

Description

  The present invention relates to a falsification preventing medium comprising a medium including ID information requiring security and a transfer foil having an OVD (Optical Variable Device) represented by a hologram, and a method of manufacturing the falsification preventing medium.

  Forgery, falsification, and alteration prevention are often performed on a medium including ID information that requires security, such as a passport or a driver's license, using printing technology, transfer technology, or other processing technology. OVD like multilayer thin film that changes color depending on viewing angle by overlaying holograms, diffraction gratings, and thin films with different optical properties, which can express stereoscopic images and special decoration images using light interference. Is often applied.

  In addition, as a technology to prevent forgery, tampering and alteration, a unique image such as a portrait is created inside the substrate by transmitting the surface of the substrate and irradiating the inside with laser light to carbonize the inside of the substrate. There is technology to form. This is mainly applied to plastic base materials such as polycarbonate and PET, and has been widely used in recent years for media that require security such as driver's licenses and passports that include ID information for identifying and authenticating individuals.

  It has been proposed to prevent tampering from the card surface by providing a laser beam irradiation coloring layer on the card core inside the card laminate and printing inside the card without damaging the card surface ( Patent Document 1).

  However, in recent years, not only printing techniques and hologram forgery techniques, but also various tampering techniques using laser light have been proposed. There is an anti-counterfeiting method that carbonizes the inside of the substrate and forms an image by color change due to carbonization, but it is possible to counterfeit by cutting the substrate from the surface and physically destroying the image, and laser Since a pigment that develops color by light is used, the image is altered by irradiating additional laser light, so that the effect of preventing forgery is not sufficient.

Japanese Patent No. 4391286

  The present invention solves the problems of forgery and falsification and alteration in the prior art, and the subject is a medium that cannot be additionally written with a laser beam and can prevent falsification, and its manufacture By providing a method, it is to realize a high anti-counterfeit effect.

  As a means for solving the above-mentioned problems, the invention according to claim 1 comprises a core base material that is carbonized at least by laser light, and a layer that develops or changes color when irradiated with light of a specific intensity or higher. A tamper-proof medium characterized by irradiating light, recording image information and text information on a core base material layer, and providing the color developing layer on a surface on which image information and text information are recorded on a core base material .

The invention according to claim 2 is a laminated substrate comprising at least three layers of a surface substrate through which the substrate transmits laser light, a core substrate carbonized by the laser beam, and a back substrate,
The chromogenic layer is an OVD transfer body having a layer that develops or changes color when irradiated with light of a specific intensity or higher;
Irradiate laser light, record the image information and text information on the core substrate without affecting the surface substrate,
The falsification preventing medium is characterized in that the OVD transfer body is provided on a surface of the laminated base material on which image information and character information are recorded on a core base material.

  According to a third aspect of the present invention, there is provided a step of irradiating a substrate to be carbonized by laser light with laser light to record image information or character information, and color development or discoloration by light irradiation with a specific intensity or more. 2. The method for manufacturing a falsification preventing medium according to claim 1, further comprising a step of providing the layer to be formed on the surface of the base material after image information and character information are recorded on the base material.

Further, the invention according to claim 4 is a step of producing a laminated base material comprising at least three layers of a surface base material that transmits laser light, a core base material that is carbonized by laser light, and a back surface base material,
Irradiating laser light, recording image information and text information on the core substrate inside the laminated substrate without affecting the surface substrate, and
An OVD transfer body having a layer that develops or changes color when irradiated with light having a specific intensity or more is recorded on the base material after image information or character information is recorded. A method for manufacturing a falsification preventing medium according to claim 2.

  According to the present invention, when an image formed in a laminated substrate by laser light irradiation is to be tampered with, the coloring layer of the OVD transfer body is colored or discolored by the laser beam, and remains as a trace of tampering. End up. Therefore, it is possible to obtain a falsification preventing medium that is difficult to counterfeit, falsify, and tamper as compared to a substrate having a transfer foil that does not include a color developing layer of an OVD transfer body.

1 is a conceptual cross-sectional view showing an embodiment of an information recording medium of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual cross-sectional view showing an embodiment of a falsification preventing medium 1 of the present invention. As shown in FIG. 1, the anti-tamper medium 1 of the present invention includes at least three layers of a front surface base material 2, a core base material 3, and a back surface base material 4. By irradiating the passing laser beam, the surface is carbonized and the image forming unit 5 is printed. After the information is printed, the OVD transfer foil 10 composed of the coloring layer 9, the OVD layer 8, the reflective layer 7, and the adhesive layer 6 that cannot be additionally written is transferred.

  Since the surface base material 2 transmits laser light, there is no influence by laser irradiation, and the core base material 3 is carbonized by the laser light to form an image forming portion 5 and image information and character information can be recorded.

  After recording image information and character information and forming the image forming portion 5, a transfer foil 10 comprising an adhesive layer 6, a reflective layer 7, a diffraction grating layer 8, and a coloring layer 9 on the surface substrate 2 on the image forming portion 5. Are provided to form the falsification preventing medium 1.

  The surface base material 2 is transparent, and a plastic material (PET, polycarbonate, polypropylene, etc.) used for manufacturing a card or passport that transmits laser light can be used as the base material. The back substrate 4 may be the same as or different from the surface substrate 2 and the core substrate 3.

  At this time, if the same material as that of the front surface base material 2 is used for the back surface base material 4, the image forming portion 5 can be provided on the core base material 3 using laser light from the back surface.

  A white plastic material (PET, polycarbonate, polypropylene, etc.) can be used for the core substrate 3. At this time, a photochromic layer may be provided, so that printing with a low-energy laser beam is possible, but the white plastic material kneaded with the white agent is carbonized by laser irradiation and becomes black, black-brown. The coloring layer may be omitted.

  For the transfer foil 10, resins and metals used for forming the adhesive layer 6, the reflective layer 7, and the OVD layer 8 that are generally used for hologram production can be used.

  For the adhesive layer 6, thermoplastic resins such as polyester resin, acrylic resin, vinyl chloride resin, polyamide resin, polyvinyl acetate resin, rubber resin, ethylene-vinyl acetate copolymer resin, vinyl chloride acetate copolymer resin can be used. The film thickness is preferably 1 to 20 μm.

The reflective layer 7 may be made of aluminum, gold, silver, copper, an alloy containing these metals, or a metal oxide or sulfide such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , or ZnS. The thickness is preferably 100 to 1000 mm.

  For the OVD layer, a thermoplastic resin, a thermosetting resin, an ultraviolet ray, an electron beam curable resin, or the like can be used. For example, acrylic resins include acrylic resins, epoxy resins, cellulose resins, vinyl resins, and the like.

  In addition, urethane resins, melamine resins, phenol resins, and the like obtained by adding polyisocyanate as a crosslinking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group and crosslinking can be used. Further, as the ultraviolet ray or electron beam curable resin, epoxy (meth) acryl, urethane (meth) acrylate, or the like can be used, and the thickness is preferably 0.5 to 5.0 μm.

  As an example of the OVD layer, a diffraction grating is used. The diffraction grating uses a metal plate recorded with a diffraction grating pattern, uses a urethane resin, coats a coating solution for forming a diffraction grating layer prepared by dissolving a urethane resin in a solvent on a PET base material, and dries. The diffraction grating pattern is formed by transferring the diffraction grating pattern to the diffraction grating forming layer obtained by heat embossing.

The OVD of the multilayer thin film method is a multilayered combination of low and high refractive index materials such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , ZnS, etc. having different refractive indexes. The reflection hue changes depending on the viewing angle.

  In order to manufacture the falsification preventing medium 1 according to the present invention, the laminated base material composed of three layers of the front surface base material 2, the core base material 3, and the back surface base material 4 is irradiated with laser light. A card-shaped falsification preventing medium 1 was prepared by recording the image forming unit 5 which is carbonized and recording image information and character information, and transferring an OVD transfer foil 10 made of a hologram including a coloring layer.

  A white polycarbonate resin sheet was used for the core substrate 3, and a colorless polycarbonate resin sheet was used for the front substrate 2 and the back substrate 4, and the structure was sandwiched between two transparent polycarbonate resin sheets.

The produced laminated base material is irradiated with laser light, and the core base material 3 made of white polycarbonate
Was carbonized to form an image forming portion 5 consisting of a black image. At this time, the transparent surface base material 2 is not colored or deformed.

  An OVD transfer foil 10 made of a hologram was transferred onto the printed image forming unit 5. The OVD transfer foil 10 made of a hologram was made of urethane resin and a diffraction grating was formed by heating embossing to obtain an OVD layer 8. A thin film made of ZnS was provided on the reflective layer 7 by vacuum deposition, and a vinyl chloride / vinyl acetate copolymer resin was used for the adhesive layer 6. Further, a coloring layer 9 was laminated to produce. A laser coloring ink (Elbima-Z117 manufactured by Toyo Ink) was used for the coloring layer 9 and applied onto the transfer foil by coating. At this time, the coloring layer 9 can be included in the transfer foil configuration in advance, and it is better to include the coloring layer 9 in the transfer foil configuration in advance than the printing after spot transfer. Is good.

  Subsequently, falsification verification of the falsification preventing medium 1 having the coloring layer 9 produced was performed. After transferring the OVD transfer foil 10 made of a hologram, the image in the base material was additionally falsified by irradiating a laser beam on the OVD transfer foil 10. As a result, it can be seen that the colored layer 10 made of laser colored ink has been discolored and has been altered.

  In order to compare with the falsification preventing medium 1 according to the present invention, the laminated medium shown in the embodiment is prepared, laser light is irradiated, the core substrate 3 made of white polycarbonate is carbonized, and the image is made of a black image. A forming portion 5 was formed. A card was prepared by transferring a hologram transfer foil containing no color developing layer thereon.

  Additional printing was performed on the core base material 3 by irradiating a laser beam onto the card on which the hologram transfer foil containing no coloring layer was transferred. It was found that the hologram transfer foil that does not include the coloring layer 9 has no coloring or discoloration, can be added to the printing information, and can be tampered with.

  The falsification preventing medium 1 of the present invention can make subsequent additional printing impossible by transferring the OVD transfer foil 10 having the coloring layer 9 to the medium on which the ID information is printed and recorded, thereby preventing falsification. It requires security such as passports and driver's licenses, and can be used for applications that require counterfeiting, falsification, and alteration prevention.

DESCRIPTION OF SYMBOLS 1 ... Anti-falsification medium 2 ... Front surface base material 3 ... Core base material 4 ... Back surface base material 5 ... Image formation part 6 ... Adhesive layer 7 ... Reflective layer 8 ... -OVD layer 9 ... coloring layer 10 ... OVD transfer foil

Claims (4)

  It consists of a core base material that is carbonized by at least laser light and a layer that develops or changes color when irradiated with light of a specific intensity or higher, and is irradiated with laser light to record image information and character information on the core base material layer, An anti-tamper medium characterized in that a coloring layer is provided on a surface on which image information and character information are recorded on a core substrate. The base material is a laminated base material composed of at least three layers of a surface base material that transmits laser light, a core base material that is carbonized by laser light, and a back surface base material,
The chromogenic layer is an OVD transfer body having a layer that develops or changes color when irradiated with light of a specific intensity or higher;
Irradiate laser light, record the image information and text information on the core substrate without affecting the surface substrate,
An anti-tamper medium, wherein the OVD transfer body is provided on a surface of the laminated base material on which image information and character information are recorded on a core base material.   A step of irradiating a substrate carbonized by laser light with laser light to record image information and character information, and a layer that develops or changes color when irradiated with light of a specific intensity or more, The method for producing a falsification preventing medium according to claim 1, further comprising a step of providing the surface of the base material after recording on the base material. A step of producing a laminated substrate composed of at least three layers of a surface substrate that transmits laser light, a core substrate that is carbonized by laser light, and a back substrate;
Irradiating laser light, recording image information and text information on the core substrate inside the laminated substrate without affecting the surface substrate, and
An OVD transfer body having a layer that develops or changes color when irradiated with light having a specific intensity or more is recorded on the base material after image information or character information is recorded. The manufacturing method of the falsification prevention medium of Claim 2.