JP2009160837A - Anti-counterfeit medium, and distinguishing method for anti-counterfeit medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-counterfeit medium in which a latent-processed image cannot easily be detected, however, when the latent image is required to be verified, the reading of the image can properly be performed, and to provide a distinguishing method for the anti-counterfeit medium. <P>SOLUTION: In this anti-counterfeit medium, on an ultraviolet ray reflective base material, at least an image consisting of an image forming material containing an ultraviolet absorption agent is installed under a state of a difficult visual recognition. Since the latent-processed image is hard to recognize, the great anti-counterfeit effect can be expected. At the same time, the proper reading of the latent-processed information becomes possible by the reading by an ultraviolet information reading apparatus using a desired band pass filter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention supports an anti-counterfeit medium provided with a UV-absorbing image-forming material in a state in which a verification image is difficult to visually recognize, and a verification image hidden in such an anti-counterfeit medium. The present invention relates to a method for discriminating a fake image prevention medium in which reflected image information to be read is read by an ultraviolet information reading device such as an ultraviolet camera so that authenticity can be verified accurately.

  Conventionally, various forgery prevention measures have been taken on printed matters such as lottery tickets and gift certificates, and cards such as membership cards and credit cards. Some anti-counterfeit media with anti-counterfeiting measures cannot be recognized in the state of being irradiated with visible light, for example, to prevent forgery or tampering. A fluorescent latent image may be provided that can be emitted and recognized. Such an anti-counterfeit medium has a fluorescent latent image that is not visible under visible light irradiation and can recognize the presence of a predetermined image only under ultraviolet light irradiation. It is formed on a base material or a white plastic base material.

  However, a paper white base or white plastic base for forming an image made of fluorescent coloring ink may be added with a whitening agent or a fluorescent agent to make the base material whiter. Increasingly, it has become a hindrance to verification of a fluorescent latent image formed of a fluorescent coloring ink formed thereon.

Therefore, as shown in Patent Document 1, it is easy to verify a fluorescent latent image by patterning a predetermined fluorescent latent image on a paper base material containing a fluorescent agent with an ink containing an ultraviolet absorber. There is also an attempt.
JP 11-34564 A

  However, an ultraviolet ray generator used for verifying a fluorescent latent image on an anti-counterfeit medium on which an image is provided in an invisible state by the fluorescent coloring ink as described above is inexpensively available as a so-called black light. Thus, the fluorescent latent image can be easily confirmed using the black light, and the security level in the forgery prevention medium as described above is low.

  The present invention has been made based on such a situation, and it is not possible to easily detect a latent image, but it is possible to accurately read a latent image when verifying the latent image. An object of the present invention is to provide a prevention medium and a method for determining the authenticity of the forgery prevention medium.

  In order to achieve the above object, the invention according to claim 1 is provided with at least an image made of an image forming material containing an ultraviolet absorber on an ultraviolet reflective substrate in a state where it is difficult to visually recognize the image. The medium is a forgery prevention medium.

  The invention according to claim 2 is the forgery prevention medium according to claim 1, wherein the image is provided by each of two or more kinds of image forming materials having different ultraviolet absorption wavelength regions. And

  Furthermore, the invention described in claim 3 is the anti-counterfeit medium described in claim 1 or 2, wherein the ultraviolet reflective substrate is formed with a hologram or a diffraction grating.

  Furthermore, in the invention described in claim 4, the anti-counterfeit medium according to any one of claims 1 to 3 is irradiated with ultraviolet rays, and an ultraviolet ray information reader is used to form an image containing an ultraviolet absorber. The information of the image provided in a forgery-preventing medium is read through a bandpass filter that selectively transmits the ultraviolet absorption peak wavelength of the material for use in the anti-counterfeit medium. This is a method for discriminating a forgery prevention medium characterized by verifying the existence of the image and the authenticity of its contents.

  The anti-counterfeit medium according to the present invention can be expected to have a large anti-counterfeit effect because a latent image is not easily recognized, and the latent image is read by an ultraviolet information reader using a desired bandpass filter. The imaged information can be read accurately, and accurate determination of authenticity can be performed by the determination method according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, for the sake of easy understanding, the thickness of the layer and the interval and ratio of the unevenness of the hologram pattern are expressed slightly different from the actual ones.

  FIG. 1 shows an anti-counterfeit medium 20 according to the present invention and an information medium 10 on which an anti-counterfeit measure is applied, in which the anti-counterfeit medium 20 is attached to a part of an information carrier 11 (see FIG. 2) such as a printed matter. FIG. 2 is an explanatory diagram showing a schematic cross-sectional structure of the information medium 10 taken with the forgery prevention measure shown in FIG.

  FIG. 3 shows a schematic cross-sectional configuration of another forgery prevention medium 39 of the present invention and an information medium 30 to which a forgery prevention measure is applied by attaching the forgery prevention medium 39 to a part of the information carrier 31. It is explanatory drawing.

  These anti-counterfeit media are basically provided with at least an image made of an image forming material containing an ultraviolet absorber on an ultraviolet reflective base material in a state where it is difficult to visually recognize the image.

  The anti-counterfeit medium 20 shown in FIGS. 1 and 2 is provided with images 15 and 16 made of ultraviolet-absorbing image forming materials having different ultraviolet absorption wavelength regions, and a protective layer 18 is laminated so as to cover them. Yes. When the protective layer 18 is not provided, the presence of the image is recognized from the difference in gloss (refractive index difference) and the level difference generated at the boundary between the images 15 and 16 regardless of how colorless and transparent the image forming material is. Therefore, the protective layer 18 has not only a function of improving the abrasion resistance but also a function of hiding the image. Further, an ultraviolet reflective material layer (in this case, an aluminum layer) 13 is applied to one side surface of the hologram forming layer 14 on which the hologram unevenness 17 is formed, and an adhesive layer 12 is provided on one side surface of the ultraviolet reflective material layer 13. It is. Reference numeral 10 denotes an information medium on which an anti-counterfeit measure is applied, in which the anti-counterfeit medium 20 is attached to a part of the information carrier 11 having predetermined information by the adhesive layer 12.

On the other hand, the anti-counterfeit medium 39 shown in FIG. 3 is the same as that of the anti-counterfeit medium 20 shown in FIG. The image 35 made of the image forming material is slightly different in that it is provided so as to be covered with an image 36 made of an ultraviolet absorbing image forming material containing another ultraviolet absorber.
Reference numeral 30 denotes an information medium on which an anti-counterfeit measure is applied, in which such an anti-counterfeit medium 39 is attached to a part of the information carrier 31 having predetermined information by the adhesive layer 32.

  Examples of the ultraviolet reflective substrate include a resin film or sheet in which a thin film of metal or ceramic is formed on one side, a resin film or sheet containing fine particles of metal or ceramic, or a metal or ceramic on one side. A resin film or sheet coated with ink containing fine particles is exemplified. Aluminum is optimal as the ultraviolet reflective metal, and examples of the ultraviolet reflective ceramic include magnesium oxide, zirconium oxide, magnesium carbonate, barium sulfate, and hydroxy carbonate.

  Commonly used paper and packaging materials often contain fluorescent whitening agents and other substances that absorb ultraviolet rays, and commonly used pigment-based colored inks such as yellow and magenta. Since cyan, black and white absorb almost all ultraviolet rays, it is relatively difficult to secure a surface having ultraviolet reflectivity.

  As shown in FIG. 2 and FIG. 3, those comprising the hologram forming layers 14 and 34 having the ultraviolet reflecting material layers 13 and 33 and having the hologram or diffraction grating formed thereon are appropriately used as the ultraviolet reflecting substrate. It is done.

  Currently, holograms and diffraction gratings are widely used as security measures. More specifically, a sheet-like base material in which a reflective film made of aluminum is formed on a hologram or a diffraction grating by vapor deposition, sputtering, or the like is used by being positioned on a medium requiring anti-counterfeiting measures. The base material having such a configuration is optimal as an ultraviolet reflective base material in the present invention, and by combining with the anti-counterfeiting technology for holograms and diffraction gratings in the base material, security is improved, and a new ultraviolet reflective property. By eliminating the need to prepare a base material, it is advantageous in terms of shortening the manufacturing process and cost.

  The images 15, 16, 35, and 36 provided in such a state that it is difficult to visually recognize on such an ultraviolet reflective substrate are formed using an ultraviolet-absorbing image forming material such as an ink containing an ultraviolet absorber. It is formed.

  The first form of the image forming material is a material containing an ultraviolet absorber and using a resin that transmits ultraviolet rays as a resin binder, or a material to which an ultraviolet absorber is covalently bonded, and is colorless in the visible region. For example, it is transparent and has an absorption band in a wavelength region where the wavelength of light is about 200 to 400 nm. Here, as the resin that transmits ultraviolet rays, the same resin as that used in the protective layer 18 can be used. On the other hand, the second form of the image forming material includes a material obtained by adding the above-described ultraviolet reflective metal or ceramic fine particles to the image forming material according to the first form. The image forming material according to the second embodiment is a material having silver color, white color or silver white color. In the present invention, it is necessary to select the same color material for the protective layer 18 or the concealment image (dummy image) in order to make it difficult to view. Even if the image forming material is colorless and transparent, it may be recognized by a gloss difference or a step, and a transparent protective layer 18 or a concealing image (dummy image) is required. Therefore, it is difficult to recognize the presence of an image on a surface having ultraviolet reflectivity when visually observed in a state irradiated with ultraviolet rays or a state irradiated with visible rays.

  Examples of the ultraviolet absorber to be contained in the image forming material include benzotriazole series, benzophenone series, cyanoacrylate series, salicylate series, and oxanilide series. In addition, a resin in which an ultraviolet absorber is covalently bonded can also be used.

Each such ultraviolet absorber has its own absorption peak. For example, 2- (2′-hydroxy-5′-methoxyphenyl) -benzotriazole, which is a benzotriazole ultraviolet absorber, has absorption peaks in the vicinity of 300 nm and 340 nm, and is a benzophenone ultraviolet absorber. -Hydroxybenzophenone has an absorption peak around 265 nm. Furthermore, resorcinol monobenzoate has an absorption peak around 240 nm. Therefore, by selecting an appropriate one of these ultraviolet absorbers and including it in the image forming material, the image formed thereby selectively transmits the ultraviolet absorption peak wavelength of the image forming material. It is possible to confirm the presence of the image in the anti-counterfeit medium that has been made into a latent image by reading it with an ultraviolet information reader through a bandpass filter that can verify the authenticity based on that. It becomes possible.

  On the other hand, the protective layer 18 provided so as to cover the images 15 and 16 having such characteristics is a layer that transmits ultraviolet rays and is provided to protect the images 15 and 16 located below. For example, cellulose resin such as ethyl cellulose, ethyl hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, cellulose butyrate, etc., vinyl resin such as polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone, acrylic resin, polyurethane resin, It is composed of a polyamide resin, a polyester resin, or a mixture thereof.

  Further, the adhesive layer 12 and the adhesive layer 32 are layers provided so as to be in the form of an anti-counterfeit medium seal or a transfer foil by being provided with these so that they can be attached to other media. By adopting such a form, in addition to expanding the range of use as an anti-counterfeit medium, it is possible to further increase security by providing brittleness.

  FIG. 4 is an explanatory diagram showing a situation when the forgery prevention medium having the above-described configuration is discriminated by the discrimination method of the present invention.

  In discrimination, first, reflection image information is extracted. Specifically, as shown in FIG. 4, for example, while reflecting the anti-counterfeit medium 20 from the ultraviolet lamp 41, the reflection information is read by the ultraviolet information reading device 44 such as an ultraviolet viewer, and reflected from the reflection information. Extract image information. At this time, the reflected light is read through the bandpass filter 12 or 13 that transmits the absorption peak wavelength of the image forming material constituting the image in the anti-counterfeit medium 20, so that the image related to the latent image is obtained. Information can be read. Reference numeral 46 denotes a read image displayed on the monitor 45.

  FIGS. 5A and 5B show an example of read image information when discrimination is performed using the forgery prevention medium 20 whose configuration is shown in FIGS. FIG. 5A shows reading information when reading without passing through the band pass filter. The image 15 and the image 16 of the forgery prevention medium 20 correspond to the read information 57 and the read information 58, respectively. FIG. 5B shows read information when read by the ultraviolet information reading device 44 through the band-pass filter 43 that transmits the absorption wavelength of the image 15, and FIG. The read information when read by the ultraviolet information reading device 44 through the bandpass filter 42 that transmits the absorption wavelength is shown.

  On the other hand, FIGS. 6A and 6B show an example of read image information when discrimination is performed using the forgery prevention medium 39 having the configuration shown in FIG. FIG. 6A shows read information when read without passing through the band pass filter. Since ultraviolet rays are absorbed in the entire region, the contrast cannot be obtained and the image cannot be read. On the other hand, FIG. 6B shows read image information 60 when read by the ultraviolet information reading device 44 through a bandpass filter 43 that transmits the absorption wavelength of the image 35.

  As described above, the anti-counterfeit medium according to the present invention cannot be easily recognized as a latent image, so that it can be expected to have a large anti-counterfeit effect, and an ultraviolet information reader using a desired bandpass filter. By reading with, it becomes possible to read information that has been formed into a latent image, and authenticity can be verified accurately.

  Specific examples of the present invention are shown below.

  On one side of a sheet-like substrate (thickness 16 μm) made of polyethylene terephthalate, an acrylic resin release protective layer is applied with a thickness of 1 μm by the gravure coating method. An image was formed in a predetermined pattern by offset printing using an ink mainly composed of an acrylic resin (absorption wavelength near 355 nm) containing UVINUL D-49 manufactured by BASF, which is a benzophenone ultraviolet absorber.

  Next, on the image peeling protective layer side formed in the above step, a gravure is formed using an ink mainly composed of an acrylic resin (absorption wavelength of about 300 nm) containing SANDUVOR VSU manufactured by Clariant, which is an oxanilide ultraviolet absorber. A thin film was applied with a film thickness of 2 μm by a coating method, a urethane resin was used, and a thin film was applied with a film thickness of 0.5 μm by a gravure coating method to provide a diffraction structure forming layer.

  Subsequently, an embossing machine equipped with a nickel hologram plate is used to mold a concavo-convex pattern related to the hologram (diffraction structure) on the diffraction structure forming layer, and an aluminum vapor deposition thin film is provided on the hologram pattern shaping surface to form a diffraction structure. A formed body was obtained. Finally, an acrylic resin adhesive layer was applied to the aluminum vapor-deposited thin film surface with a thickness of 2 μm using a gravure coating method to obtain a diffraction structure transfer foil (anti-counterfeit medium).

  Next, an information medium which has been transferred to a part of a printed matter (information carrier) on which predetermined information is provided by hot stamping using the diffraction structure transfer foil (anti-counterfeit medium) obtained in the above-described step and has been subjected to anti-counterfeiting Got.

  In the state where the forgery-preventing information medium obtained as described above is irradiated with ultraviolet light emitted from an ultraviolet lamp, the concealed image is detected by an ultraviolet information reader without using a band-pass filter. As a result, the contrast was not obtained in the forgery prevention medium portion, and the pattern could not be read.

  On the other hand, forgery prevention is performed by an ultraviolet information reading device through a band pass filter that transmits a wavelength near 355 nm in a state in which the portion of the forgery prevention medium in the information medium subjected to forgery prevention is irradiated with ultraviolet rays emitted from an ultraviolet lamp. When the concealed image in the medium was read, the pattern could be read.

It is a top view which shows an example of the information medium which applied the forgery prevention measure in which the forgery prevention medium which concerns on this invention, and the forgery prevention medium are provided in part. It is explanatory drawing which shows the general | schematic cross-sectional structure in the cross-section part by the AB line | wire of the information medium which applied the forgery prevention measure in which the forgery prevention medium shown in FIG. It is explanatory drawing which shows the general | schematic cross-sectional structure of the information medium which applied the forgery prevention measure in which the other forgery prevention medium of this invention and the forgery prevention medium are provided in part. It is explanatory drawing which shows the condition at the time of discriminating the forgery prevention medium with the discriminating method of this invention. FIG. 5 is an explanatory diagram showing an example of read image information when authenticity determination is performed using an anti-counterfeit medium whose structure is shown in FIG. 1 and FIG. 2, and FIG. FIG. 5B shows the read information when read by the ultraviolet ray information reading device via the band pass filter 43 that transmits the absorption wavelength of the image 15. ) Shows read information when read by the ultraviolet information reading device 44 through a band pass filter 42 that transmits the absorption wavelength of the image 6. FIG. 6 is an explanatory diagram showing an example of read image information when authenticity determination is performed using a forgery prevention medium having the configuration shown in FIG. 3. FIG. FIG. 6B shows the read information when read by the ultraviolet ray information reader through the band pass filter 43 that transmits the absorption wavelength of the image 15.

Explanation of symbols

10, 30 ... Information medium 11, 21 with anti-counterfeiting measures ... Information carrier 12 ... Adhesive layer 13, 33 ... UV-reflective material layer 14, 34 ... Hologram forming layer 15, 16 ... Image 35, 36 ... Image 17, 37 ... Hologram unevenness 18 ... Protective layer 20, 39 ... Counterfeit prevention medium 32 ... Adhesive layer 41 ... UV lamp 42, 43... Band pass filter 44... UV information reading device 45... Monitor 46... Scanned image 57 and 58.

Claims (4)

  An anti-counterfeit medium characterized in that at least an image made of an image forming material containing an ultraviolet absorber is provided on an ultraviolet reflective substrate in a state where it is difficult to visually recognize the image.   The anti-counterfeit medium according to claim 1, wherein the image is provided by each of two or more kinds of image forming materials having different ultraviolet absorption wavelength regions.   The anti-counterfeit medium according to claim 1, wherein a hologram or a diffraction grating is formed on the ultraviolet reflective substrate.   The anti-counterfeit medium according to any one of claims 1 to 3 is irradiated with ultraviolet rays, and the ultraviolet absorption peak wavelength of an image forming material containing an ultraviolet absorber is selectively transmitted by an ultraviolet information reader. The image information provided in the forgery prevention medium is read through a bandpass filter that is difficult to see, and the presence of the image in the forgery prevention medium and the authenticity of the contents are verified based on the read information. A method for discriminating a forgery prevention medium.