JP2014063039A - Transfer foil and forgery prevention medium - Google Patents

Abstract

An object of the present invention is to make it possible to obtain two types of latent image images, thereby making forgery and tampering difficult and producing a high anti-counterfeit effect.
A thin film flat plate-like support base material 4 and first phase difference layers 2 having different optical axes arranged alternately in the same plane of one of the support base materials and along a predetermined direction, and The second retardation layer 3 and the first retardation layer 2 and the adhesive layer 6 formed on the upper surface of the second retardation layer 3 are provided. The transfer foil 1 is configured to form one image, a positive image as a second image, a first image by the first phase difference layer 2, and a second image by the second phase difference layer 3 by thermal transfer.
[Selection] Figure 2

Description

  The present invention relates to a transfer foil for transferring a face image, a fingerprint, an identification number, and the like as a specific key to a personal authentication medium such as a booklet or a card such as a passport or a visa, and the face image, fingerprint, identification number to the personal authentication medium. The present invention relates to an anti-counterfeit medium having a high anti-counterfeit effect obtained by transferring the like.

  Many personal authentication media such as passports and ID (identification) cards use facial images to enable visual information authentication.

  Conventionally, for example, in the case of a passport, a photographic paper on which a face image is printed is pasted on a booklet that is a main part of a passport. However, such a passport may be tampered with by changing the photo print.

  Therefore, in recent years, based on the above reasons, it has been carried out to digitize face image information and reproduce it on a booklet. As this image reproduction method, sublimation (heat transferable) dyes, thermal transfer recording methods using transfer ribbons using resin-type melting types and wax-melting types in which pigments are dispersed, or electrophotography, etc. have been studied. Has been tried.

  In addition to the methods described above, the passport image reproduction method includes a recording method using an inkjet printer, a laser printing recording method using a CO2 (carbon dioxide) laser, a YAG laser, and a thermal color former, and a basic method. There is a laser engraving printing recording method in which carbon (C) present in the material is used for printing recording in the depth direction of the substrate.

  Further, as an image display body containing this kind of authentication data, an image pattern formed based on the authentication image data is applied to a card substrate such as polyvinyl chloride, or a hologram in addition to the image pattern. And an optical thin film using a diffraction grating or multilayer interference (representing an image such as a color shift that makes it possible to control the color tone of reflected light using optical interference by optical design). And so-called OVD (Optical Variable Device) images are known.

  In particular, holograms and diffraction grating structures include credit cards, cash cards, membership card cards, employee card cards, prepaid cards, various cards such as driver's licenses, various paper tickets such as gift certificates, gift certificates, and stock certificates. Affix to a part or all of display forms such as covers and panels such as books and notebooks, as well as various forms such as application forms, receipts, and copy slips, and various booklets such as passports, passbooks, and pension notebooks. Therefore, it is used as a forgery prevention means.

  By the way, since the forgery prevention medium which formed such an arbitrary image by such OVD transfer foil can be recognized visually, there exists a problem which is easy to be forged.

  Therefore, in recent years, anti-counterfeiting technology using a polymer liquid crystal material having a covert function that makes an authenticity judgment by appearing as a latent image (hidden image) when a filter is turned over has been proposed. (Patent Document 1).

  As a method for forming an arbitrary image having a covert function, an anti-counterfeit medium in which an arbitrary birefringence pattern is formed by patterning an ink composition containing a liquid crystal compound on an alignment layer by an inkjet method has been proposed. (Patent Document 2).

JP-A-8-43804 JP 2010-282153 A

  However, in the anti-counterfeiting technique of Patent Document 2, since the optical axis of the birefringence pattern is oriented only in one axial direction, the obtained latent image appears only as a simple image. As a result, for example, if the image is simple, there is a problem that it is relatively easily forged.

  The present invention has been made in view of the above-described circumstances, and enables transfer of arbitrary and two types of latent image images, thereby making forgery and tampering difficult and providing a higher anti-counterfeit effect and forgery. An object is to provide a prevention medium.

  In order to solve the above-mentioned problems, the invention corresponding to claim 1 is arranged in a thin film flat plate-like support base and alternately in the same direction on either side of the support base and along a predetermined direction. A first phase difference layer and a second phase difference layer having different optical axes, and an adhesive layer formed on the upper surface of the first phase difference layer and the second phase difference layer. The negative image that has been processed is used as the first image, the positive image is used as the second image, the first image is transferred by the first retardation layer, and the second image is transferred by the second retardation layer. It is the transfer foil characterized.

  According to the invention corresponding to the first aspect, the first retardation layer and the second retardation layer having different optical axes are formed on the support base material, and the first retardation layer is used to generate 2 of the original data for personal authentication. Since the negative image (first image) subjected to the valuation process can be thermally transferred to the positive image (second image) by the second retardation layer, the optical axis of the birefringence pattern can be oriented in two axial directions, and as a result The two types of latent image can be authenticated by passing through a filter, which makes it difficult to forge and tamper.

  In the invention corresponding to claims 2 to 4, the optical axes of the first retardation layer and the second retardation layer, which are constituent elements of the invention corresponding to claim 1, are different from each other by 45 ° or 90 °. Further, the retardation value of the both retardation layers is any one of 1 / 4λ, 1 / 2λ, and 1 / 8λ.

  An invention corresponding to claim 5 is the transfer foil according to any one of claims 1 to 4, wherein the first retardation layer, the second retardation layer, and the transfer foil according to any one of claims 1 to 4. A reflective layer is provided between the adhesive layer and the adhesive layer.

  The invention corresponding to claim 6 is the transfer foil according to any one of claims 1 to 5, wherein a relief forming layer is formed on the top surfaces of the first retardation layer and the second retardation layer. The reflective layer is provided along the formed relief forming layer. Thereby, the forgery prevention effect by visual observation can be improved by combining a relief formation layer.

  The invention corresponding to claim 7 is the transfer foil according to any one of claims 1 to 6, wherein the support base material, the first retardation layer, and the second retardation layer. A release layer is provided between them.

  Furthermore, the invention corresponding to claim 8 uses the transfer foil having the structure described in any one of claims 1 to 7 to binarize the personal authentication original data. The transferred negative image is the first image, the positive image is the second image, the first image is formed by the first retardation layer by thermal transfer, and the second image is formed by the second retardation layer. An anti-counterfeit medium comprising a foil transfer part.

  According to the invention corresponding to the eighth aspect, it is possible to authenticate by making two types of latent image images visible through a filter, thereby making it easy to identify information authentication, and forgery and tampering are difficult. In addition, counterfeiting and tampering can be easily found.

  According to the present invention, it is possible to provide a transfer foil and an anti-counterfeit medium that can obtain arbitrary and two kinds of latent image images, thereby making forgery and tampering difficult and obtaining a higher anti-counterfeit effect.

The conceptual diagram which shows one Embodiment of the transfer foil which concerns on this invention. Sectional drawing of the transfer foil shown in FIG. The image figure when taking the face photograph as an example at the time of using transfer foil for a personal authentication medium. The figure which shows the 1st image which is a negative image when the image | photographed face image is binarized, and the 2nd image which is a positive image. The figure which shows an example of the forgery prevention medium which concerns on this invention. FIG. 6 is a conceptual diagram when a verifier is placed on the transfer foil transfer portion of FIG. 5. FIG. 6 is a conceptual diagram when a verifier is placed on the transfer foil transfer portion of FIG. 5. Sectional drawing which shows roughly an example of the image transfer to the forgery prevention medium which concerns on this invention. Sectional drawing which shows roughly an example of the forgery prevention medium which concerns on this invention.

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

  FIG. 1 is a conceptual diagram showing an embodiment of a transfer foil according to the present invention.

  In the transfer foil 1, the first retardation layer 2 and the second retardation layer 3 are alternately arranged along the conveyance direction of the transfer foil 1. It is shown that the optical axes of the first retardation layer 2 and the second retardation layer 3 are different by 45 ° as indicated by arrows.

  FIG. 2 is a cross-sectional view of the transfer foil 1 of FIG. The transfer foil 1 includes a flat support substrate 4 having a desired width, first retardation layers 2 and second retardation layers 3 that are alternately arranged on the support substrate 4, and first positions thereof. The reflection layer 5 and the adhesive layer 6 are formed on the upper surfaces of the phase difference layer 2 and the second phase difference layer 3 in a predetermined order.

  Next, components related to the transfer foil 1 will be described in detail.

(Phase difference layer 2, 3)
For the first retardation layer 2 and the second retardation layer 3 constituting the transfer foil 1, a material having birefringence is used. Here, birefringence is a phenomenon in which the speed of light when passing through a substance differs because the refractive index of the substance varies depending on the optical axis direction. For this reason, the light after passing through the substance has a phase difference corresponding to the difference in passage speed. For these retardation layers 2 and 3, for example, a liquid crystal material can be used.

  Further, as shown by arrows in FIG. 1, the first retardation layer 2 and the second retardation layer 3 have two types of optical axes arranged alternately with respect to the transfer foil 1 conveyance direction. As a method of arranging the optical axes of the retardation layers 2 and 3 in two axes, the alignment film for aligning the liquid crystal material is aligned in two axes, and the liquid crystal is applied thereon to be aligned in two axes. Get liquid crystal. For the alignment treatment of the alignment film for aligning the liquid crystal material, for example, a photo alignment method or a rubbing alignment method can be used. The retardation value can be determined by the birefringence and film thickness of the liquid crystal.

  Here, the photo-alignment method means that the alignment film is irradiated with light having anisotropy such as polarized light or non-polarized light from an oblique direction to induce rearrangement of molecules in the alignment film or anisotropic chemical reaction. This method utilizes the fact that liquid crystal molecules are aligned by giving anisotropy to the alignment film. Examples of the photo-alignment mechanism include photo-anisotropy of azobenzene derivatives, photo-dimerization and crosslinking of derivatives such as cinnamic acid ester, coumarin, chalcone and benzophenone, and photolysis of polyimide and the like.

  A specific alignment method is performed by exposing the pattern with polarized light in an appropriate wavelength band or non-polarized light from an oblique direction. For example, in the case of orientation in the biaxial direction, pattern exposure is performed by covering a portion whose orientation direction is to be changed with a photomask, and further, exposure is performed by changing the direction in order to process unexposed portions covered with the photomask. . Alternatively, once the entire surface is once exposed to pattern, it may be partially covered with a photomask and changed in direction to be exposed again.

  On the other hand, the rubbing alignment method is a method of rubbing an alignment film prepared by applying a polymer solution on a substrate with a cloth, the properties of the alignment film surface change in the rubbing direction, and liquid crystal molecules are aligned in this direction. This is a property that uses this property. For the alignment film, polyimide, PVA (polyvinyl alcohol), or the like is used.

  When aligning the optical axis in the biaxial direction, cover the part whose orientation direction is to be changed with a mask, rub it with a cloth, remove the mask, then cover the rubbed part with the mask and turn the direction again. After changing and rubbing with a cloth, the mask is removed. Alternatively, the entire surface may be rubbed with a cloth, partially covered with a mask, the direction may be changed, and the mask may be removed after being rubbed with a cloth.

  As a method for forming these alignment films, known methods such as a gravure coating method and a micro gravure coating method can be used.

  Further, the retardation layers 2 and 3 can be formed by applying a liquid crystal material on the alignment film subjected to the alignment treatment as described above. As liquid crystal materials, photocurable liquid crystal monomers with acrylates provided at both ends of the mesogenic group, polymer liquid crystals cured with EB (abbreviation of electron beam) or UV (abbreviation of ultraviolet ray), and mesogenic groups were provided in the polymer main chain. Polymer liquid crystals, liquid crystalline polymers in which the molecular main chain itself is aligned, and the like can be used. The orientation of these liquid crystals can be promoted by applying a heat treatment at a temperature slightly below the NI point at which phase transition occurs.

(Supporting substrate 4)
As the support base material 4, an unstretched film produced by extrusion or casting, a stretched film produced by stretching, or the like can be used. The stretched film includes a uniaxially stretched film and a biaxially stretched film depending on how to stretch, but both can be used.

  These unstretched films and stretched film materials include cellophane, polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyolefin (PO), ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVA), polychlorinated. Examples thereof include vinyl, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), nylon, acrylic resin, and triacetyl cellulose (TAC) film.

(Reflection layer 5)
As the material of the reflective layer 5, a single metal material such as Al, Sn, Cr, Ni, Cu, Au, or Ag, or a compound thereof is used.

The transparent layer 5 that is substantially transparent to light perpendicular to the film surface of the reflective layer 5 but exhibits reflection characteristics according to the refractive index with respect to oblique light can be used as a single layer or multiple layers. Examples of materials that can be used as the transparent reflective layer 5 are given below. The numerical value in parentheses following the chemical formula or compound name shown below indicates the refractive index n. Ceramics include Fe ₂ O ₃ (2.7), TiO ₂ (2.6), CdS (2.6), CeO ₂ (2.3), ZnS (2.3), PbCl ₂ (2.3 ), CdO (2.2), WO ₃ (5), SiO (5), Si ₂ O ₃ (2.5), In ₂ O ₃ (2.0), PbO (2.6), Ta ₂ O ₃ (2.4), ZnO (2.1), ZrO ₂ (5), MgO (1), SiO ₂ (1.45), MgF ₂ (4), CeF ₃ (1), CaF ₂ (1. 3-1.4), AlF ₃ (1), Al ₂ O ₃ (1), GaO (2) and the like. Examples of the organic polymer include polyethylene (1.51), polypropylene (1.49), polytetrafluoroethylene (1.35), polymethyl methacrylate (1.49), polystyrene (1.60), and the like. It is not limited to these materials.

  As a method for forming the reflective layer 5, for example, a known method such as a vacuum deposition method, a sputtering method, or a CVD method can be appropriately used. Moreover, the method of providing the ink etc. which have a light reflection effect with a well-known printing method may be sufficient.

  In addition, a relief forming layer (not shown) is applied to the upper surfaces of the first retardation layer 2 and the second retardation layer 3 before the reflection layer 5 is applied, and then the reflection layer 5 is formed along the relief formation layer. May be. As a method of forming the reflective layer 5 along the relief forming layer, a relief type press plate comprising a relief hologram using a light interference after making a relief forming layer in advance or a fine uneven pattern forming a diffraction grating. After the fine concavo-convex pattern is replicated by heating and pressurizing using the above, the reflective layer 5 is formed along the relief structure by forming the reflective layer 5 using a known method such as the vacuum deposition method. it can.

  The relief forming layer may be made of a material that has good moldability by heat, is less likely to cause press unevenness, and can provide a bright reproduced image. For example, thermoplastic resins such as acrylic resins, epoxy resins, cellulose resins, vinyl resins, acrylic resins having reactive hydroxyl groups, polyester polyols, etc. added polyisocyanates as crosslinking agents, crosslinked urethane resins, Thermosetting resins such as melamine resins and phenol resins, and ultraviolet or electron beam curable resins such as epoxy (meth) acryl and urethane (meth) acrylate can be used alone or in combination. Moreover, even if it is resin other than the above, if a diffraction structure pattern can be formed, it can be used suitably.

(Adhesive layer 6)
As the adhesive layer 6, a heat-sensitive adhesive that exhibits tackiness when heated is used. The adhesive layer 6 is applied to, for example, the reflective layer 5 serving as a base material using a gravure coater, a micro gravure coater, a roll coater or the like with a resin satisfying these performances. As a material used, thermoplastic resins such as acrylic resin, vinyl chloride vinyl acetate copolymer, epoxy, and EVA can be used.

(Peeling layer)
The transfer foil 1 shown in FIG. 2 is alternately disposed on the first retardation layer 2 and the second retardation layer 3 on the upper surface of the support substrate 4. For example, a release layer (not shown) is disposed on the upper surface of the support substrate 4. ), The first retardation layer 2 and the second retardation layer 3 may be alternately arranged on the upper surface of the release layer.

  At this time, the release layer may be a single resin or a resin added with a lubricant. As the resin, a thermoplastic resin, a thermosetting resin, a moisture curable resin, an ultraviolet curable resin, an electron beam curable resin, or the like can be used. For example, acrylic resin, polyester resin, and polyamideimide resin. As the lubricant, polyethylene powder or wax such as carnauba wax can be used. These are formed as a release layer on the supporting substrate 1 by a known coating method such as a gravure printing method or a micro gravure method.

  Next, FIG. 3 shows an image diagram for taking a face photograph as an example when the transfer foil 1 as described above is used as a personal authentication medium. Reference numeral 7 denotes a person to be an authentication image, and reference numeral 8 denotes an imaging camera for photographing the person 7.

  FIG. 4 is a diagram showing an example in which a face photograph taken by the imaging camera 8 is binarized. FIG. 4A shows a negative image when binarized, and FIG. 4B shows a positive image when binarized. The negative image and the positive image are thermally transferred as a first image 9a and a second image 9b to the transfer medium by receiving heat pressure from the thermal head.

  Here, as the transfer medium 17 (see FIGS. 8 and 9), a transparent base material or an opaque base material may be used. Further, as a material, paper, plastic, metal, ceramic, or glass may be used.

  FIG. 5 shows a forgery prevention medium 10 such as a passport booklet.

  The forgery prevention medium 10 is an example of a personal authentication medium, on which information such as images 11 to 13 is placed. Further, the anti-counterfeit medium 10 is provided with a transfer foil transfer portion 14.

  Images 11 to 13 placed on the anti-counterfeit medium 10 are images including personal information. This personal information includes personal authentication information used for personal authentication, and can be classified into, for example, biological information and non-biological personal information.

  The biological information is unique to the individual among the characteristics of the biological body. For example, the biometric information is at least one image or pattern such as a face, a fingerprint, or a vein.

  Non-biological personal information is personal information other than biological information. For example, the non-biological personal information is at least one of name, date of birth, age, blood type, gender, nationality, address, permanent address, telephone number, affiliation, and status. The non-biological personal information may include characters input by typing, may include characters input by machine reading a handwriting such as a signature, or may include both of them. .

  These images can be composed of, for example, dyes and pigments. In this case, a thermal transfer recording method using a thermal head, an ink jet recording method, an electrophotographic method, or a combination of two or more thereof can be used. Alternatively, it can be formed by forming a layer containing a thermal color former and drawing on this layer with a laser beam. Alternatively, a combination of these methods can be used. At least a part of the image may be formed by a thermal transfer recording method using a hot stamp, a printing method, or a combination thereof.

  Moreover, you may express an image using the hologram for the images 11-13. The image used for the hologram for enhancing the falsification preventing effect may be personal information, but is not limited thereto.

  The transfer foil transfer unit 14 mainly includes an image, but personal information as described above may be used.

  In the example of FIG. 5, a face photograph is used, but the present invention is not limited to this, and personal authentication information that can authenticate an individual may be used. The information is converted into two images, a negative image and a positive image, and used as transfer patterns for the first retardation layer 2 and the second retardation layer 3.

  6 and 7 are diagrams when the verifier 15 is put on the transfer foil transfer portion 14 of the forgery prevention medium 10 shown in FIG. The first image 9a has already been obtained using the first retardation layer 2, and the second image 9b has been obtained using the second retardation layer 3, and the optical axes of the respective retardation layers 2 and 3 are 45 °. Because of the difference, when the verifier 15 is tricked and further rotated, the negative image shown in FIG. 6 and the positive image shown in FIG. 7 can appear.

  Here, for example, when the linear polarizer is used for the verifier 15 and the reflection layer 5 is incorporated in the transfer foil 1, the phase difference value may be 1 / 4λ. When a transparent substrate is used, a linear polarizer is disposed on the back surface of the transfer medium 17, and a linear polarizer is used for the verifier 15, 1 / 2λ is effective. Further, for example, when a circular polarizer is disposed on the back surface of the transfer medium 17 and a circular polarizer is used for the verification device 15, 1 / 8λ is effective. In either case, Any phase difference value of 1 / 4λ, 1 / 2λ, and 1/8 may be used.

  FIG. 8 is a view showing a state in which the transfer foil 1 is thermally transferred by the thermal head 16 through the support base 4.

  The portion heated by the thermal head 16 is transferred to a transfer medium 17 as a transfer foil transfer portion 14 as shown in FIG. This transfer foil transfer part 14 is comprised by the 1st phase difference layer 2 which forms the 1st image 9a, and the 2nd phase difference layer 3 which forms the 2nd image 9b.

  Further, the transfer from the transfer foil 1 to the transfer medium 17 will be described in detail.

  As described above, the transfer foil 1 is transferred to the transfer medium 17 by the thermal pressure of the thermal head 16. At this time, thermal pressure is applied by the thermal head 16 through the support base 4 to melt the adhesive layer 6, and press-contact with the transfer medium 17. At this time, the first image 9a and the second image 9b, which are image patterns binarized based on the input image data, are converted into data. Based on this data, the first retardation layer 2 is transferred as a first image 9a and the second retardation layer 3 is transferred as a second image 9b using a thermal head 16. One image is formed by the first image 9a and the second image 9b, and the transfer foil transfer portion 14 is produced.

  Here, when the forgery prevention medium 10 of the present invention is a passport such as a personal authentication medium, the transfer foil transfer unit 14 includes a face photo, text data such as name, nationality, expiration date, etc. It is an image expressed with the color material. For example, the image captured as shown in FIG. 3 is binarized to obtain a negative image and a positive image as shown in FIG. 4, and the first image 9a and the second image 9b are connected to the first retardation layer 2 and the first image. Since the two phase difference layers 3 are used, images as shown in FIGS. 6 and 7 can be observed.

  Examples of the present invention will be described below.

  An alignment film solution in which an alignment film resin was dissolved was applied to the support substrate 4 of Lumirror (polyester film) 19F60 by a microgravure method to form a film. After that, rubbing with a rubbing cloth in a direction inclined by 90 ° with respect to the flow direction (conveying direction) at the full width of the original fabric, which is the full width of the surface of the thin film flat substrate 4, and then in the flow direction at the full width of the original fabric The rubbing cloth was rubbed in a direction inclined by 45 °. That is, an alignment film was produced by performing an alignment treatment by rubbing alternately in the 90 ° direction, 45 ° direction, 90 ° direction, and 45 ° direction with respect to the flow direction.

  Thereafter, UV curable liquid crystal UCL-008 manufactured by DIC Corporation was applied by a micro gravure so as to have a phase difference value of λ / 4, and UV curing was performed in an oxygen atmosphere. As a result, a portion rubbed in the direction inclined by 90 ° with respect to the flow direction was obtained as the first retardation layer 2, and a portion rubbed in the direction inclined by 45 ° with respect to the flow direction was obtained as the second retardation layer 3. .

  Thereafter, a reflective layer 5 made of aluminum was formed on the upper surfaces of the retardation layers 2 and 3. The reflective layer 5 was formed using a vacuum deposition method so that the thickness was 500 mm. Thereafter, an acrylic resin was used as the adhesive layer 6 and provided on the entire surface by microgravure to produce the transfer foil 1.

  Further, as shown in FIG. 3, the person 7 was photographed and immediately binarized to obtain a negative image and a positive image as shown in FIG. Thereafter, the transfer foil 1 produced as described above is used as the first image 9a and the second retardation layer 3 is used as the second image 9b using the thermal head 16 as shown in FIG. Transcription was performed. As a result, an anti-counterfeit medium 14 having a transfer foil transfer part 14 in part as shown in FIG. 5 was obtained.

  Thereafter, as a result of observing the transfer foil transfer portion 14 using the verification device 15, the latent image as shown in FIGS. 6 and 7 could be confirmed, although it could not be confirmed visually. That is, since the binarized data of the first image 9a and the second image 9b is transferred to the anti-counterfeit medium 14 using a thermal head, a latent image having a high degree of freedom such as a person's face and identification number is generated. I was able to form.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  Further, the above embodiment includes various upper and lower level inventions, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted because some constituent elements can be omitted from all the constituent elements described in the means for solving the problem, the omitted part is used when the extracted invention is implemented. Is appropriately supplemented by well-known conventional techniques.

  DESCRIPTION OF SYMBOLS 1 ... Transfer foil, 2 ... 1st phase difference layer, 3 ... 2nd phase difference layer, 4 ... Support base material, 5 ... Reflective layer, 6 ... Adhesive layer, 7 ... Person, 8 ... Imaging camera, 9a ... 1st Image, 9b ... Second image, 10 ... Anti-counterfeit medium, 11-13 ... Image, 14 ... Transfer foil transfer part, 15 ... Verification device, 16 ... Thermal head, 17 ... Medium to be transferred.

Claims (8)

A thin plate-like support base;
A first retardation layer and a second retardation layer having different optical axes arranged alternately along the predetermined direction in the same plane of any one of the support substrates,
The adhesive layer formed on the upper surface of the first retardation layer and the second retardation layer,
The negative image obtained by binarizing the original data for personal authentication is the first image, the positive image is the second image, the first image is formed by the first retardation layer, and the second image is formed by the second retardation layer. A transfer foil configured to be capable of thermal transfer. In the transfer foil according to claim 1,
The transfer foil, wherein optical axes of the first retardation layer and the second retardation layer are different from each other by 45 °. In the transfer foil according to claim 1,
The transfer foil, wherein optical axes of the first retardation layer and the second retardation layer are different from each other by 90 °. In the transfer foil according to any one of claims 1 to 3,
The transfer foil according to claim 1, wherein the retardation value of the retardation layer is any one of 1 / 4λ, 1 / 2λ, and 1 / 8λ. In the transfer foil according to any one of claims 1 to 4,
A transfer foil, wherein a reflective layer is provided between the first retardation layer, the second retardation layer, and the adhesive layer. In the transfer foil according to any one of claims 1 to 5,
A transfer foil, wherein a relief forming layer is formed on upper surfaces of the first retardation layer and the second retardation layer, and the reflection layer is provided along the formed relief forming layer. In the transfer foil according to any one of claims 1 to 6,
A transfer foil, wherein a release layer is provided between the support substrate and the first retardation layer and the second retardation layer.   A negative image obtained by binarizing the original data for personal authentication using the transfer foil having the configuration described in any one of claims 2 to 7 as a first image and a positive image as a second image. An anti-counterfeit medium comprising: a transfer foil transfer portion in which the first image is formed by the first retardation layer by thermal transfer and the second image is formed by the second retardation layer.

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