JP2023133933A - Method for manufacturing personal authentication medium - Google Patents

Abstract

To provide a technique that makes forgery or alteration of a personal authentication medium difficult.SOLUTION: A method for manufacturing a personal authentication medium includes the steps of: creating latent image print data from individual information; recording a part or all of individual information data as a visibly recognizable pattern that is recognizable by observation of a naked eye, and provided on a first part of a substrate with an adhesive layer sandwiched therebetween; and providing an array print on a second part of the substrate with the adhesive layer sandwiched therebetween according to the latent image print data. The creation of the latent image print data includes the steps of: creating a code for a latent image composed of one or more indices from at least a part of a digital code showing individual information; and referring to a table made up of a plurality of records in which indices and latent image element data corresponding to the indices are individually recorded to acquire one or more pieces of latent image element data corresponding to one or more indices, and creating latent image print data from the latent image element data.SELECTED DRAWING: None

Description

The present invention relates to a method for manufacturing a personal authentication medium.

Personal authentication media, for example, identification (ID) cards such as employee ID cards, driver's licenses, and student ID cards, or passports record information linked to their owners, that is, individual information. The individual information recorded on the personal authentication medium is, for example, the owner's face image, name, date of birth, gender, status, affiliation, qualification, authority, and personal code. A facial image or the like is used, for example, to confirm that the owner of the personal authentication medium is the owner.

Generally, personal authentication media have measures in place to make it difficult to forge or alter them. However, with the spread of color copying machines and the appearance of highly functional photolithographic devices, techniques for forgery and alteration have become more sophisticated. Therefore, the risk of crime due to forgery or alteration of personal authentication media is increasing.

As a measure to make it difficult to forge or alter a personal authentication medium, invisible information that cannot be determined under normal conditions but becomes distinguishable by using a verification tool may be recorded on the personal authentication medium. For example, authenticity may be determined by recording a pattern consisting of lines or halftone dots on a personal authentication medium, and checking the moire displayed by overlaying this pattern with a verification tool such as a lenticular film ( Patent Documents 1 to 4).

Japanese Patent Application Publication No. 6-40190 JP2002-279480A US Patent Application Publication No. 2020/0218953 International Publication No. 2009/139396

An object of the present invention is to provide a technology that makes it difficult to forge or alter a personal authentication medium.

According to one aspect of the present invention, the step of generating latent image print data from individual information, and printing a part or all of the data of the individual information on a first portion of a substrate that is recognizable by observation with the naked eye. recording as a visible identification pattern provided with an adhesive layer in between; and providing an array print on a second portion of the substrate with an adhesive layer in between, according to the latent image print data. The generation of the latent image print data includes a step of generating a latent image code consisting of one or more indexes from at least a part of the digital code representing the individual information, and a step of generating the latent image element data corresponding to the index. One or more latent image element data corresponding to the one or more indexes are obtained by referring to a table consisting of a plurality of records in which are recorded, and the latent image printing data is obtained from the one or more latent image element data. A method of manufacturing a personal authentication medium is provided, which includes a step of generating a personal authentication medium.

According to another aspect of the present invention, the method includes: generating latent image print data associated with at least part of the individual information; and providing array printing on a base material according to the latent image print data; provides a method for manufacturing a personal authentication medium that displays moiré when superimposed on a visualization filter consisting of halftone dots or lines.

According to still another aspect of the present invention, the production of the personal authentication medium according to the above aspect further includes recording at least a part of the individual information on the base material as a visible identification pattern that can be recognized by observation with the naked eye. A method is provided.

According to still another aspect of the present invention, the table is made up of a plurality of records each including an index and latent image element data, and the latent image element pattern corresponding to the latent image element data is a halftone dot or multi-layered pattern. The method further includes preparing a table that displays moiré when superimposed on a visualization filter made of lines, and generating the latent image print data from at least a portion of the digital code representing the individual information. generating a latent image code consisting of an index; and referring to the latent image code to the table, and generating data including one or more latent image element data corresponding to the one or more indexes into the latent image. There is provided a method of manufacturing a personal authentication medium according to any of the above aspects, which includes generating print data.

According to still another aspect of the present invention, in one or more of the plurality of records, the latent image element pattern corresponding to the latent image element data includes three or more sub-patterns arranged in the first direction, and the three or more Each of the sub-patterns includes a plurality of linear parts each extending in the first direction and arranged spaced apart from each other in a second direction intersecting the first direction, and each sub-pattern is adjacent to the three or more sub-patterns. Accordingly, there is provided a method for manufacturing a personal authentication medium according to the above aspect in which the position of the linear portion is shifted in the second direction.

According to still another aspect of the present invention, the one or more indexes are two or more indexes, and the one or more latent image element data are two or more latent image element data. A method of manufacturing a media is provided.

According to still another aspect of the present invention, there is provided a method for manufacturing a personal authentication medium according to any one of the above aspects, in which the array printing is provided on the base material by thermal transfer.

According to still another aspect of the present invention, there is provided a method for manufacturing a personal authentication medium according to any of the above aspects, further comprising providing the visualization filter on the base material. The visualization filter can be provided on the base material with an adhesive layer interposed therebetween.

According to still another aspect of the present invention, there is provided a method for manufacturing a personal authentication medium according to the aspect described above, in which the array printing and the visualization filter are provided so as to face each other with the base material interposed therebetween.

According to still another aspect of the present invention, there is provided a method for manufacturing a personal authentication medium according to any of the above aspects, wherein the visible identification pattern includes a visible image code.

According to still another aspect of the present invention, there is provided a method for manufacturing a personal authentication medium according to any of the above aspects, in which one or more of the adhesive layers are omitted.

According to still another aspect of the present invention, there is provided a step of preparing a personal authentication medium including a base material and an array print provided on the base material, and the array print is a visualization filter consisting of halftone dots or parallel lines. A step of acquiring verification information from the moire displayed when superimposed, a step of acquiring individual information from the personal authentication medium or its owner, and a step of comparing the verification information with the individual information. Authentication methods including:

According to still another aspect of the present invention, there is provided the authentication method according to the above aspect, wherein the visualization filter is provided on the base material or on an adhesive layer on the base material.

Alternatively, according to still another aspect of the present invention, there is provided an authentication method according to the above aspect, wherein the acquisition of the verification information includes stacking the personal authentication medium and the verification tool including the visualization filter. Ru.

According to still another aspect of the present invention, there is provided an authentication method according to any one of the above aspects, in which the acquisition of the verification information includes acquisition of information regarding a change in moiré caused by tilting the personal authentication medium.

FIG. 1 is a plan view showing an example of a personal authentication medium that can be manufactured by the method according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the personal authentication medium shown in FIG. 1 taken along line II-II. FIG. 3 is a plan view showing the visualization filter of the personal authentication medium shown in FIGS. 1 and 2. FIG. 4 is a plan view showing an example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 5 is a plan view showing another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 6 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 7 is a diagram showing first to third observation conditions. FIG. 8 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 4 is adopted for the array print is observed under the first observation condition. FIG. 9 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 4 is adopted for the array print is observed under the second observation condition. FIG. 10 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 4 is adopted for the array print is observed under the third observation condition. FIG. 11 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 5 is adopted for the array print is observed under the first observation condition. FIG. 12 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 5 is adopted for the array print is observed under the second observation condition. FIG. 13 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 5 is adopted for the array print is observed under the third observation condition. FIG. 14 is a diagram showing an example of a third image displayed under the first observation condition by a personal authentication medium that employs the structure of FIG. 5 for array printing. FIG. 15 is a diagram showing an example of a third image displayed under the second observation condition by a personal authentication medium that employs the structure of FIG. 5 for array printing. FIG. 16 is a diagram showing an example of a third image displayed under a third observation condition by a personal authentication medium that employs the structure of FIG. 5 for array printing. FIG. 17 is a flowchart showing a method for manufacturing a personal authentication medium according to the first embodiment of the present invention. FIG. 18 is a diagram showing an example of a printing device that can be used in the method shown in FIG. 17. FIG. 19 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 20 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 21 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 19 is adopted for the array print is observed under the first observation condition. FIG. 22 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 19 is adopted for the array print is observed under the second observation condition. FIG. 23 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 19 is adopted for the array print is observed under the third observation condition. FIG. 24 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 25 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 26 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 27 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 24 is adopted for the array print is observed under the first observation condition. FIG. 28 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 24 is adopted for the array print is observed under the second observation condition. FIG. 29 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 24 is adopted for the array print is observed under the third observation condition. FIG. 30 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 25 is adopted for the array print is observed under the first observation condition. FIG. 31 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 25 is adopted for the array print is observed under the second observation condition. FIG. 32 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 25 is adopted for the array print is observed under the third observation condition. FIG. 33 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 26 is adopted for the array print is observed under the first observation condition. FIG. 34 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 26 is adopted for the array print is observed under the second observation condition. FIG. 35 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 26 is adopted for the array print is observed under the third observation condition. FIG. 36 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 37 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 36 is adopted for the array print is observed under the first observation condition. FIG. 38 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 36 is adopted for the array print is observed under the second observation condition. FIG. 39 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 36 is adopted for the array print is observed under the third observation condition. FIG. 40 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 41 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print is observed under the first observation condition. FIG. 42 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium employing the structure of FIG. 40 for the array print is observed under the second observation condition. FIG. 43 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium employing the structure of FIG. 40 for the array print is observed under the third observation condition. FIG. 44 shows the relative position of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print and the structure of the visualization filter is changed is observed under the first observation condition. Figure shown. FIG. 45 shows the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print and the structure of the visualization filter is changed is observed under the second observation condition. Figure shown. FIG. 46 shows the relative position of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print and the structure of the visualization filter is changed is observed under the third observation condition. Figure shown. FIG. 47 is a plan view showing an example of a personal authentication medium that can be manufactured by the method according to the second embodiment of the present invention. FIG. 48 is a plan view showing an example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 49 is a plan view showing another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 50 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 51 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 52 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 53 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 54 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 55 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 56 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 57 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.

Embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are more specific implementations of any of the above aspects. The matters described below can be incorporated into each of the above aspects alone or in combination. In addition, the embodiments shown below illustrate configurations for embodying the technical idea of the present invention, and the technical idea of the present invention includes the materials, shapes, structures, etc. of the following constituent members. It is not limited by. Various changes can be made to the technical idea of the present invention within the technical scope defined by the claims.

Note that elements having the same or similar functions will be designated by the same reference numerals in the drawings referred to below, and overlapping explanations will be omitted. In addition, the drawings are schematic, and the relationship between dimensions in one direction and dimensions in another direction, and the relationship between the dimensions of a certain member and the dimensions of other members, etc. may differ from the actual one. It can be different.

<First embodiment>
FIG. 1 is a plan view showing an example of a personal authentication medium that can be manufactured by the method according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the personal authentication medium shown in FIG. 1 taken along line II-II. FIG. 3 is a plan view showing the visualization filter of the personal authentication medium shown in FIGS. 1 and 2. FIG. FIG. 4 is a plan view showing an example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. FIG. 5 is a plan view showing another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 6 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2.

Note that in each figure, the X direction is a direction parallel to the first principal surface described later, that is, a direction parallel to the display surface of the personal authentication medium. Further, the Y direction is a direction parallel to the first principal surface and perpendicular to the X direction, that is, a direction parallel to the display surface and perpendicular to the X direction. The Z direction is a direction perpendicular to the X and Y directions, that is, the thickness direction of the personal authentication medium.

The personal authentication medium 1A shown in FIGS. 1 and 2 is, for example, a data page of an ID card or a passport. As shown in FIG. 2, the personal authentication medium 1A includes a base material 11, a protective layer 12, an adhesive layer 13, a visible identification pattern 14, a visualization filter 15, a protective layer 16, and an adhesive layer 17. , and array printing 18.

The base material 11 can be a soft base material such as a sheet and a film, or a hard base material such as a card. The base material 11 includes an identification area 111 and a verification area 112. The identification area 111 and the verification area 112 are a first part and a second part, respectively.

The identification area 111 and the verification area 112 may be placed adjacent to each other. Identification region 111 and verification region 112 can be spaced apart from each other. The identification area 111 and the verification area 112 may partially or completely overlap.

The identification region 111 is adjacent to the verification region 112 in the in-plane direction, that is, in the direction perpendicular to the thickness direction of the base material 11. The identification area 111 may or may not have light transparency. Note that the term "light" means visible light unless otherwise specified. Furthermore, when referring to properties related to light, unless otherwise specified, properties related to visible light are meant.

The material of the identification area 111 can be an inorganic material such as glass, metal, and ceramics, or an organic material such as a polymer. As the organic substance such as a polymer, for example, those exemplified as the material of the verification area 112 can be used. Identification area 111 may be paper.

Verification area 112 has optical transparency. Verification area 112 may be transparent or translucent. Verification area 112 does not need to have optical transparency.

The material of the verification area 112 can be an inorganic material such as glass, or an organic material such as a polymer. Examples of organic substances such as polymers include polycarbonate resins, acrylic resins, fluorine-based acrylic resins, silicone-based acrylic resins, epoxy acrylate resins, polystyrene resins, cycloolefin polymers, methylstyrene resins, fluorene resins, and polyethylene terephthalate (PET). ), and cured products of photocurable resins such as polypropylene; cured products of acrylonitrile styrene copolymer resins, thermosetting resins such as phenol resins, melamine resins, urea resins, and alkyd resins; and polypropylene resins, polyethylene Thermoplastic resins such as terephthalate resins and polyacetal resins can be mentioned.

The material of the verification area 112 may be different from the material of the identification area 111. Alternatively, the material of the verification area 112 may be the same as the material of the identification area 111. For example, verification area 112 may be integral with identification area 111.

Each of the identification area 111 and the verification area 112 may have a single layer structure or a multilayer structure. Each of these may have a structure formed by laminating a plurality of thermoplastic sheets by heat pressing. When at least one of the identification area 111 and the verification area 112 has a multilayer structure, the number of layers may be the same or different.

The base material 11 may have a built-in chip module. The base material 11 containing the chip module can be made by sandwiching the chip module between a pair of thermoplastic sheets and laminating these thermoplastic sheets by heat pressing. The chip module includes memory. Data of individual information may be recorded in the memory. The personal authentication medium 1A has a chip module, so that individual information can be electrically read. Therefore, in addition to being usable for visual authentication, the personal authentication medium 1A can also be used, for example, as a key for an electronic lock of an automatic gate.

The protective layer 12 faces one surface of the base material 11. The protective layer 16 faces the other surface of the base material 11 .

As the material for the protective layers 12 and 16, for example, thermosetting resin, photocuring resin, and thermoplastic resin can be used. The protective layer 12 is light-transmissive and preferably transparent. The protective layer 16 may be transparent or opaque. One or both of protective layers 12 and 16 can be omitted.

At least one of the protective layers 12 and 16 may include a diffractive structure. Here, the diffraction structure is at least one of a hologram and a diffraction grating. For example, a relief structure may be provided on the surface of the protective layer 12 or 16 as a diffraction structure. In this way, the image displayed by this diffraction structure and the first to third images, which will be described later, can be overlapped or arranged side by side.

When at least one of the protective layers 12 and 16 includes a diffractive structure, examples of the material include polycarbonate resin, acrylic resin, fluorine-based acrylic resin, silicone-based acrylic resin, epoxy acrylate resin, polystyrene resin, and cycloolefin polymer. , photocurable resins such as methylstyrene resin, fluorene resin, PET, and polypropylene; thermosetting resins such as acrylonitrile styrene copolymer resin, phenol resin, melamine resin, urea resin, and alkyd resin; or polypropylene resin, Thermoplastic resins such as polyethylene terephthalate resin and polyacetal resin can be mentioned. A diffraction structure forming layer can be formed by molding this resin into a desired structure on the release layer and curing it. The cured resin that forms the diffractive structure is all light-transmissive, and its refractive index is generally about 1.5.

A transparent reflective layer may be provided on at least one of the protective layers 12 and 16. For example, when a relief structure is provided as a diffraction structure on the surface of the protective layer 12 or 16, if a transparent reflective layer is provided on this surface, the diffraction image can be displayed brighter.

As the transparent reflective layer, for example, a layer made of a transparent material having a different refractive index from that of the protective layer 12 or 16 can be used. A transparent dielectric can be used as this transparent material. The transparent dielectric can be a metal compound or silicon oxide. Specific examples of metal compounds are ZnS and _TiO2 . The transparent reflective layer can be formed, for example, by a vacuum film forming method such as vacuum evaporation or sputtering. The transparent reflective layer can have a multilayer structure obtained by forming a film multiple times using a vacuum film forming method.

Alternatively, a metal layer with a thickness of less than 20 nm may be used as the transparent reflective layer. The thickness of the metal layer can be 5 nm or more. If it is 5 nm or more, it is easy to obtain a homogeneous transparent reflective layer. As the material of the metal layer, for example, metals such as chromium, nickel, aluminum, iron, titanium, silver, gold, and copper can be used.

The transparent reflective layer may have a single layer structure or a multilayer structure. In the latter case, the transparent reflective layer may be designed to produce repeated reflective interference.

The adhesive layer 13 is interposed between the base material 11 and the protective layer 12, and bonds them together. The adhesive layer 17 is interposed between the base material 11 and the protective layer 16, and bonds them together. The adhesive layers 13 and 17 are light-transmissive, preferably transparent, and more preferably colorless and transparent. Each of the adhesive layers 13 and 17 may have a single layer structure made of an adhesive, or may have a multilayer structure including a layer made of an adhesive and a layer made of an anchor coating agent.

The visible identification pattern 14 is a layer that displays an image that can be discerned when the personal authentication medium 1A is observed with the naked eye. The visible identification pattern 14 is provided between the base material 11 and the protective layer 12. Here, the visible identification pattern 14 is provided on the surface of the protective layer 12 facing the base material 11. The visible identification pattern 14 can also be provided at other locations. For example, the visible identification pattern 14 can be provided on the surface of the base material 11 facing the protective layer 12. The visible identification pattern 14 can also be provided between the base material 11 and the protective layer 16. In this case, the visible identification pattern 14 can be provided on the surface of the protective layer 16 facing the base material 11, or can be provided on the surface of the base material 11 facing the protective layer 16. Alternatively, part of the visible identification pattern 14 can be provided between the base material 11 and the protective layer 12, and the rest can be provided between the base material 11 and the protective layer 16.

The visible identification pattern 14 is, for example, a printed layer containing at least one of a dye and a pigment. To form such a visible identification pattern 14, a thermal transfer recording method using a thermal head, an inkjet recording method, an electrophotographic method, or a combination of two or more thereof can be used. Alternatively, the visible identification pattern 14 can be formed by forming a layer containing a heat-sensitive coloring agent and drawing on this layer with a laser beam. Alternatively, the visible identification pattern 14 can be formed by first forming a metal layer and removing a portion of this metal layer by laser beam drawing or the like. Alternatively, a combination of these methods can be used to form the visible identification pattern 14.

The visible identification pattern 14 displays the first image I1 and the second image I2 shown in FIG. The first image I1 includes a facial image of the owner of the personal authentication medium 1A. The second image I2 is a character string that displays other individual information of the owner of the personal authentication medium 1A.

The visualization filter 15 is interposed between the base material 11 and the protective layer 12 at the verification region 112, as shown in FIG. The interface between the base material 11 and the protective layer 12 can be a plane. The protective layer 12 and the base material 11 may be in contact with each other, and a single layer or a plurality of layers may be interposed between them. When the base material 11 and the protective layer 12 are in contact with each other, the visualization filter 15 can be formed at the interface between them. When the base material 11 and the protective layer 12 are laminated with another layer in between, the visualization filter 15 can be formed at any interface between them. Here, the visualization filter 15 is provided on the surface of the protective layer 12 facing the base material 11. The visualization filter 15 can also be provided on the surface of the base material 11 facing the protective layer 12.

The visualization filter 15 includes a concealing section 151 and a transmitting section 152, as shown in FIG. Here, the visualization filter 15 has a pattern consisting of stripes. Note that this stripe is sometimes referred to as a "line". A pattern consisting of halftone dots can also be provided as the visualization filter 15. The visualization filter 15 can have a periodic pattern.

The ratio Ts/Tt between the transmittance Ts of the concealing section 151 and the transmittance Tt of the transmitting section 152 can be 0.01 or more. Within this range, it is easy to form the visualization filter 15. The ratio Ts/Tt can be 0.7 or less. Within this range, moire is easily visible.

Here, the concealing portions 151 and the transmitting portions 152 each have a shape extending in one direction, and are arranged alternately in the width direction. Specifically, the concealing portions 151 and the transmitting portions 152 each have a shape extending in the X direction, and are arranged alternately in the Y direction. The concealing parts 151 have the same width WA1 and are arranged in the Y direction at a constant pitch P1. Therefore, the widths WA2 of the transparent parts 152 are also equal to each other.

The visualization filter 15 can be formed, for example, by the same method as described above for the visible identification pattern 14.

As the hiding part 151, for example, an opaque metal reflective layer can be used. The concealing portion 151 made of such a material can be formed, for example, by a vacuum film forming method such as vacuum evaporation or sputtering. In this case, the material of the concealing part 151 can be metal. Examples of metals are chromium, nickel, aluminum, iron, titanium, silver, gold and copper.

Alternatively, an opaque printed layer can be used as the hiding portion 151. This printed layer can be formed by a printing method similar to that described above for visible identification pattern 14. For example, the printing layer is formed by thermal transfer recording using a thermal head.

The transparent part 152 is a gap between the concealing parts 151. These gaps are filled with transparent material. Here, the gaps between the concealing parts 151 are filled with the material of the adhesive layer 13.

The ratio WA1/WA2 between the width WA1 and the width WA2 is preferably in the range of 1 to 2. When the ratio WA1/WA2 is within the above range, aesthetically pleasing moire is likely to occur. The width WA1 is preferably in the range of 20 to 200 μm. When the width WA1 is within the above range, the visualization filter 15 can be easily formed.

As shown in FIG. 2, the array print 18 is interposed between the base material 11 and the protective layer 16 at the position of the verification area 112. The protective layer 16 and the base material 11 may be in contact with each other, and a single layer or a plurality of layers may be interposed between them. When the base material 11 and the protective layer 16 are in contact with each other, the array print 18 can be formed at the interface between them. When the base material 11 and the protective layer 16 are laminated with another layer in between, the array print 18 can be formed at any interface between them. Here, the array printing 18 is provided on the surface of the protective layer 16 facing the base material 11. The array print 18 can also be provided on the surface of the base material 11 facing the protective layer 16.

The array print 18 displays a visible pattern when superimposed on the visualization filter 15. The visible pattern can be a variable visible pattern in which the displayed image shifts as the viewer changes the viewing direction. The visible pattern can be moiré. The array printing 18 here includes a first linear part 181 and a second linear part 182, as shown in FIGS. 4 to 6. The array print 18 can be formed, for example, by a method similar to that described above for the visible identification pattern 14.

The array print 18 and the visualization filter 15 can be arranged parallel to each other and spaced apart from each other. The direction in which they are arranged can be perpendicular to the plane on which the visualization filter 15 is formed and the plane on which the arrayed print 18 is formed.

The first linear portions 181 and the second linear portions 182 each have a shape extending in one direction, and are arranged alternately in the width direction. Specifically, each has a shape extending in the X direction, and is arranged alternately in the Y direction. The first linear portions 181 have the same width WB1 and are arranged in the Y direction at a constant pitch P2. Therefore, the second linear portions 182 also have the same width WB2.

As described later, the pitch P2 may be equal to or different from the pitch P1 shown in FIG. 3. Furthermore, the width WB1 may be equal to or different from the width WA1 or WA2. The width WB2 may be equal to or different from the width WA1 or WA2. Note that when the width WA1 and the width WA2 are equal, it is easy to see the movement of the entire pattern, for example, the movement of images I3A, I3B, and I3C shown in FIGS. 14 to 16.

When the pitch P2 is larger than the pitch P1, the ratio P2/P1 between the pitch P2 and the pitch P1 is preferably larger than 1, and more preferably 1.1 or more. In this case, the ratio P2/P1 is preferably 2 or less, more preferably 1.5 or less.

If the pitch P2 is smaller compared to the pitch P1, the ratio P2/P1 is preferably smaller than 1. When the ratio P2/P1 is smaller than 1, moiré is easy to see. When the pitch P2 is smaller than the pitch P1, the ratio P2/P1 is more preferably 0.9 or less. When the ratio P2/P1 is 0.9 or less, it is easy to confirm moire and to visually recognize the movement.

When the pitch P2 is smaller than the pitch P1, the ratio P2/P1 is preferably 0.5 or more. When the ratio P2/P1 is 0.5 or more, moiré can be easily confirmed. When the pitch P2 is smaller than the pitch P1, the ratio P2/P1 is more preferably 0.6 or more. When the ratio P2/P1 is 0.6 or more, it is easy to confirm moire and to visually recognize the movement.

The ratio WB1/WB2 between the width WB1 and the width WB2 is preferably in the range of 4/5 to 2. If the ratio WB1/WB2 is made small, it may become difficult to visually recognize a shift in the gradation due to a change in the viewer's viewing direction. When the ratio WB1/WB2 is increased, it becomes necessary to increase the width WA1 of the concealing portion 151, and as a result, the moire becomes darker overall.

The width WB1 is preferably within a range of 15 to 200 μm. If the width WB1 is made smaller, it becomes difficult to form the array print 18 by printing or the like. In addition, if the width WB1 is made smaller, high precision is required for the relative position of the visualization filter 15 and the array print 18. When width WB1 is increased, individual first linear portions 181 can be identified by observation with the naked eye. In addition, increasing the width WB1 reduces the difficulty of forging the personal authentication medium 1A.

In the structure of FIG. 4, pitch P2 is different from pitch P1. Here, pitch P2 is larger compared to pitch P1. Furthermore, the width WB1 is larger than the widths WA1 and WA2, and the width WB2 is approximately equal to the width WA1 or WA2. Here, as an example, assume that the ratio WA1/WA2 is 1, the width WB1 is 1.5 times the width WA1, and the width WB2 is equal to the width WA2.

In the structure of FIG. 5, array print 18 includes sub-patterns 18A, 18B and 18C. Subpatterns 18A, 18B, and 18C are arranged in this order in the X direction. The boundary between sub-pattern 18A and sub-pattern 18B and the boundary between sub-pattern 18B and sub-pattern 18C are parallel to the Y direction. In each of sub-patterns 18A, 18B and 18C, pitch P2 is equal to pitch P1 shown in FIG. In the sub-pattern 18B, the positions of the first linear part 181 and the second linear part 182 are shifted by a distance S in a direction parallel to the Y direction, specifically, downward in the figure, with respect to the sub-pattern 18A. ing. In the sub-pattern 18C, the positions of the first linear part 181 and the second linear part 182 are shifted downward in the figure by a distance S with respect to the sub-pattern 18B.

The ratio S/P2 between the distance S and the pitch P2 is preferably within the range of 0.1 to 0.5. Within this range, it is easy to obtain an image with appropriate movement. Preferably, the distance S is in the range of 10 to 150 μm.

Here, as an example, it is assumed that the widths WB1 and WB2 are equal to the widths WA1 and WA2, respectively, and the distance S is 1/4 of the pitch P2.

The structure of FIG. 6 is similar to the structure of FIG. 5 except for the following points. That is, in the sub-pattern 18B, the positions of the first linear part 181 and the second linear part 182 are shifted upward in the figure by a distance S with respect to the sub-pattern 18A. In the sub-pattern 18C, the positions of the first linear part 181 and the second linear part 182 are shifted upward in the figure by a distance S with respect to the sub-pattern 18B.

When the structures shown in FIGS. 4 to 6 are adopted, the relative position between the visualization filter 15 and the array print 18 changes as the viewing direction changes, as will be explained below. A change in the viewing direction of the observer can be a change in the angle formed by the observer's line of sight with respect to the surface of the personal authentication medium 1A. Here, as an example, the concealing part 151 and the first linear part 181 are black, the second linear part 182 is colorless and transparent, and in the personal authentication medium 1A, the protective layer 12 is installed on the observer side, It is assumed that a white reflective plate is installed on the back side of the personal authentication medium 1A.

FIG. 7 is a diagram showing the first to third observation conditions.
In FIG. 7, positions VP1, VP2, and VP3 represent the positions of the observer's eyes under the first, second, and third observation conditions, respectively. Specifically, under the first observation condition, the viewing direction is perpendicular to the X direction and slightly tilted in one direction with respect to the Z direction. Under the second observation condition, the viewing direction is parallel to the Z direction. In the third observation condition, the viewing direction is perpendicular to the X direction and slightly tilted in the opposite direction to the Z direction. Hereinafter, the viewing directions under the first, second, and third viewing conditions will be referred to as first, second, and third viewing directions, respectively.

FIG. 8 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 4 is adopted for the array print is observed under the first observation condition. FIG. 9 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 4 is adopted for the array print is observed under the second observation condition. FIG. 10 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 4 is adopted for the array print is observed under the third observation condition.

As mentioned above, in the personal authentication medium 1A in which the structure of FIG. They are arranged at pitch P1 and pitch P2, respectively. Further, the pitch P1 and the pitch P2 are different. Therefore, the superposition of the visualization filter 15 and the array print 18 displays a pattern in which the black linear parts are arranged in the width direction at a pitch larger than the pitches P1 and P2, as moiré. .

Further, the visualization filter 15 and the array print 18 are spaced apart from each other. Therefore, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, the image is displayed by overlapping the visualization filter 15 and the array print 18, as shown in FIGS. The positions of the black line parts of the moire moves in the width direction.

FIG. 11 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 5 is adopted for the array print is observed under the first observation condition. FIG. 12 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 5 is adopted for the array print is observed under the second observation condition. FIG. 13 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 5 is adopted for the array print is observed under the third observation condition.

As described above, in the personal authentication medium 1A in which the arrangement print 18 has the structure shown in FIG. They are arranged at pitch P1 and pitch P2, respectively. Pitch P1 and pitch P2 are equal to each other. In the sub-pattern 18B, the positions of the first linear part 181 and the second linear part 182 are shifted downward in the figure by a distance S with respect to the sub-pattern 18A, and in the sub-pattern 18C, the positions of the first linear part 181 and the second linear part 182 are shifted downward in the figure by a distance S. In contrast, the positions of the first linear portion 181 and the second linear portion 182 are shifted downward in the figure by a distance S. Therefore, when the visualization filter 15 and the array print 18 are superimposed, one of the three portions corresponding to the sub-patterns 18A, 18B and 18C is black, and the other portion is black, as a moiré pattern. A pattern is displayed that is dark gray and one portion is light gray.

Further, the visualization filter 15 and the array print 18 are spaced apart from each other. Therefore, when the observation conditions are sequentially changed from the first observation condition to the second and third observation conditions, the overlapping of the visualization filter 15 and the array print 18 is displayed as shown in FIGS. 11 to 13. In the moire, each of the black part, dark gray part, and light gray part moves to the right in the figure.

FIG. 14 is a diagram showing an example of a third image displayed under the first observation condition by a personal authentication medium that employs the structure of FIG. 5 for array printing. FIG. 15 is a diagram showing an example of a third image displayed under the second observation condition by a personal authentication medium that employs the structure of FIG. 5 for array printing. FIG. 16 is a diagram showing an example of a third image displayed under the third observation condition by a personal authentication medium that employs the structure of FIG. 5 for array printing.

In FIGS. 14 to 16, the above structure of the part corresponding to subpattern 18A is adopted at the position of the character string "SE", and the above structure of the part corresponding to subpattern 18B is adopted at the position of the character string "CU". 12 shows an image displayed with a configuration in which the above structure of the portion corresponding to the sub-pattern 18C is adopted at the position of the character string "RE".

In the personal authentication medium 1A adopting this configuration, under the first observation condition, the third image is black at the position of the character string "SE", dark gray at the position of the character string "CU", and dark gray at the position of the character string "CU", and the third image is black at the position of the character string "CU". The light gray image I3A is displayed at the position "RE". Furthermore, under the second observation condition, this personal authentication medium 1A is dark gray at the position of the character string "SE", black at the position of the character string "CU", and black at the position of the character string "RE" as the third image. The dark gray image I3B is displayed at the position. Under the third observation condition, this personal authentication medium 1A is light gray at the position of the character string "SE", dark gray at the position of the character string "CU", and is dark gray at the position of the character string "RE" as the third image. '', the black image I3C is displayed.

Note that the personal authentication medium 1A in which the structure shown in FIG. 6 is adopted for the array print 18 is different from the personal authentication medium 1A in which the structure shown in FIG. is the opposite. In this personal authentication medium 1A, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, the moiré displayed by the superposition of the visualization filter 15 and the array print 18 becomes black. , the dark gray part, and the light gray part each move in the opposite direction to that of the personal authentication medium 1A in which the structure of FIG. 5 is adopted for the array printing 18.

The personal authentication medium 1A described above is manufactured, for example, by the following method.
FIG. 17 is a flowchart showing a method for manufacturing a personal authentication medium according to the first embodiment of the present invention.

In the method described here, first, a table is prepared for associating one or more pieces of individual information of the person who should own the personal authentication medium 1A with the array printing to be provided on the personal authentication medium 1A. This table, for example, consists of a plurality of records each including an index and latent image element data. Here, the index is one or more pieces of individual information or a numerical value derived therefrom. Further, the latent image element pattern corresponding to the latent image element data displays moiré when superimposed on the visualization filter 15. Table 1 below is an example of this table.

Table 1 contains two records. The index and latent image element data included in one record are "0" and "array A", respectively. The index and latent image element data included in the other record are "1" and "array B", respectively. “Array A” and “Array B” represent the types of arrangement of the first linear portion 181 and the second linear portion 182 in the array printing 18. Here, as an example, "array A" represents the arrangement of the first linear part 181 and second linear part 182 employed in the array printing 18 of FIG. It is assumed that this represents the arrangement of the first linear portion 181 and the second linear portion 182 employed in the array printing 18.

Note that the table is a data block allocated in the memory or a part thereof, and the latent image element data is a numerical value of the data block and indicates the type of arrangement of the first linear portion 181 and the second linear portion 182. It can be a numerical value representing The latent image element data may also be data representing the arrangement of the first linear portion 181 and the second linear portion 182 itself.

Next, latent image print data is generated from the individual information.
For example, first, a latent image code consisting of one or more indexes is generated from at least a portion of a digital code representing individual information (step S1). Here, as an example, a latent image code is generated from the year of birth (in the Western calendar) of the person who should own the personal authentication medium 1A. Specifically, if the year of birth of the person who should own the personal authentication medium 1A is an even number, the index is "0". Furthermore, if the year of birth of the person who should own the personal authentication medium 1A is an odd number, the index is assumed to be "1". The latent image code is made up of this index.

Note that the latent image code may be a hash value generated from a digital code representing individual information using a cryptographic hash function. Alternatively, the hash value generated by the cryptographic hash function may be encrypted using a common key cryptosystem, a public key cryptosystem, or a combination thereof to be used as a latent image code. When generating a latent image code using a public key cryptographic function, the latent image code can be a ciphertext obtained by encrypting a hash value generated from a digital code representing individual information with a private key. From the latent image code, an array print 18 can be formed as described later. In this case, if the visible identification pattern 14 is formed to display the hash value, the latent image code is read from the formed array print 18, the hash value is decrypted using the public key, and the decryption process is performed. Authenticity can be verified by checking whether the hash value and the hash value displayed by the visible identification pattern 14 match. As a result, the digital code representing the individual information recorded on one personal authentication medium 1A and the array printing provide multi-factor security including security due to the difficulty of cryptographic calculation and security due to the difficulty of manufacturing the medium. can be realized.

Next, this latent image code is referred to the above table, and latent image print data is generated from one or more latent image element data corresponding to the one or more indexes (step S2). Here, when the index is "0", "array A" is selected as the latent image element data. Further, when the index is "1", "array B" is selected as the latent image element data. Then, latent image print data is obtained from the selected one or more latent image element data. This latent image print data includes data on the relative position and shape of the first linear portion 181 and second linear portion 182 linked to the selected latent image element data, and data on the position and shape of the array print 18. It can be generated from. The latent image print data can include data on the position and shape of the first linear portion 181 and the second linear portion 182.

Thereafter, array printing 18 is provided on the base material 11 according to the latent image printing data (step S3). Further, the base material 11 is further provided with a visible identification pattern 14, a visualization filter 15, and the like. In the manner described above, the personal authentication medium 1A is obtained.

The visible identification pattern 14, the visualization filter 15, and the array print 18 can be formed using, for example, the following printing device.

FIG. 18 is a diagram showing an example of a printing device that can be used in the method shown in FIG. 17.
The printing device 2 shown in FIG. 18 includes a delivery roller 22, a take-up roller 23, a delivery roller 25, a take-up roller 26, a thermal head 27, and a platen roller 28.

The feed roller 22 feeds out the transfer material 21 . The take-up roller 23 winds up the transfer material 21 sent out by the delivery roller 22.

The feed roller 25 feeds out the thermal ink ribbon 24. The take-up roller 26 takes up the thermal ink ribbon 24 sent out by the delivery roller 25.

The thermal head 27 and the platen roller 28 are installed so as to face each other with the transfer material 21 and the thermal ink ribbon 24 in between. The thermal head 27 applies thermal pressure to the thermal ink ribbon 24 to cause thermal transfer of ink from the thermal ink ribbon 24 to the transfer material 21 .

The transfer target material 21 includes a transfer target base material and an adhesive layer. The substrate to be transferred is, for example, a polymer film or sheet. The polymer film or sheet is made of plastic materials such as, for example, polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polymethyl methacrylate (PMMA), and polyethylene (PE). The adhesive layer of the transfer material 21 is made of a material that has good adhesion to the ink of the heat-sensitive ink ribbon 24. The transferred material 21 may include an adhesive anchor layer provided on the transferred substrate.

When forming the visualization filter 15 by the printing device 2, at least a portion of the transfer material 21 is used as the protective layer 12. When forming the array print 18 by the printing device 2, at least a portion of the transferred material 21 is used as the protective layer 16. At least a portion of the visible identification pattern 14 may be formed directly onto the substrate 11. Alternatively, at least one of the visualization filter 15 and the array print 18 may be formed directly on the base material 11.

If the year of birth of the owner of the personal authentication medium 1A manufactured in this way is an even number, the overlapping of the visualization filter 15 and the array print 18 is as described with reference to FIGS. 8 to 10. , displays moiré including an array of black linear parts. Then, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, in this moiré, the black linear portion moves in the width direction of the concealing portion 151, as shown in FIGS. 8 to 10. Moving.

In addition, if the year of birth of the owner of the personal authentication medium 1A manufactured in this way is an odd number, the overlapping of the visualization filter 15 and the array print 18 will be as shown in FIGS. The moire including the black portion, dark gray portion, and light gray portion as described with reference to FIG. 16 is displayed. Then, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, each of the black portion, dark gray portion, and light gray portion in this moiré is As shown in FIG. 16, the concealing portion 151 moves in the length direction.

This personal authentication medium 1A displays a first image I1 including the face image of its owner. Therefore, by using the first image I1, it can be confirmed that the person in possession of the personal authentication medium 1A is the original owner of the personal authentication medium 1A.

Further, the personal authentication medium 1A displays a second image I2 including the year of birth of the owner. As mentioned above, the gradation of the third image displayed by the personal authentication medium 1A and the shift according to the change in the viewing direction are determined depending on whether the year of birth of the owner of the personal authentication medium 1A is an even number or an odd number. It depends. If a person attempting to forge or alter the personal authentication medium 1A does not know the correspondence between the second image I2 and the gradation of the third image and the shift according to the change in the viewing direction, the manufactured forgery or alteration This correspondence relationship may not be correct for some products.

Therefore, by checking the relationship between the year of birth contained in the second image I2 and the gradation of the third image and its shift according to changes in the viewing direction, counterfeit or altered products of the personal authentication medium 1A can be detected. Can be detected. That is, the year of birth included in the second image displayed by a certain personal authentication medium, the gradation of the third image displayed by the personal authentication medium, and the shift according to the change in the viewing direction are as shown in Table 1, etc. If the correspondence relationship described for genuine products is not achieved while referring to the personal authentication medium, it can be determined that the personal authentication medium is not a genuine product.

Note that the correspondence in the image displayed by a counterfeit or altered product may coincidentally be the same as that of a genuine product. However, such counterfeit or altered products that are accidentally determined to be genuine place the user at risk of being discovered to be fraudulent. Therefore, the above-mentioned measures can significantly reduce the usefulness of counterfeit or altered products to those who use them illegally.

Further, even if a pattern similar to the above-mentioned moire is printed on one side of the base material, it is not possible to reproduce the change in moire according to the change in the viewing direction. An extremely sophisticated technique is required to analyze the structure of the authentic personal authentication medium 1A and accurately reproduce it in a counterfeit product.

Therefore, according to the above-described technology, it is possible to make it difficult to forge or alter a personal authentication medium.

Further, in the above-mentioned technique, when specifying the moiré that is displayed when the array print 18 is superimposed on the visualization filter 15, it is also possible to utilize the movement of the black portion or the like according to the change in the viewing direction. It is easy to confirm the direction of movement of the black part, etc. in response to a change in the viewing direction. Furthermore, by changing the viewing direction, it is also possible to acquire a plurality of images in which the positions of black parts and the like differ. Therefore, it becomes possible to read the information recorded on the array print 18 more reliably.

In the example described with reference to Table 1, the table contains two records. If the number of records included in the table is increased, there is a possibility that a person attempting to forge or alter the personal authentication medium 1A will be able to manufacture a counterfeit or altered product using the correspondence recorded in the record used to manufacture the genuine product. becomes lower. Table 2 below is another example of a table in which each record includes an index and latent image element data.

Table 2 contains four records. In this table, "array A," "array B," "array C," and "array D" are assigned to indexes "0," "1," "2," and "3," respectively. "Array A", "Array B", "Array C" and "Array D" each represent the type of arrangement of the first linear part 181 and the second linear part 182, and the type of this arrangement is are different from each other.

When such a table is used, a latent image code can be generated from the birth month of the person who should own the personal authentication medium 1A. For example, if the month of birth of the person who should own the personal authentication medium 1A is between January and March, the index is assumed to be "0". If the month of birth of the person who should own the personal authentication medium 1A is between April and June, the index is assumed to be "1". If the month of birth of the person who should own the personal authentication medium 1A is between July and September, the index is assumed to be "2". If the month of birth of the person who should own the personal authentication medium 1A is between October and December, the index is assumed to be "3". The latent image code is made up of this index.

Next, this latent image code is referred to the above table to obtain one or more latent image element data corresponding to the one or more indexes. Here, when the index is "0", "array A" is selected as the latent image element data. If the index is "1", "array B" is selected as the latent image element data. If the index is "2", "array C" is selected as the latent image element data. When the index is "3", "array D" is selected as the latent image element data. Then, latent image print data is obtained from the selected one or more latent image element data. This latent image print data includes data on the relative position and shape of the first linear portion 181 and second linear portion 182 linked to the selected latent image element data, and data on the position and shape of the array print 18. It can be generated from. The latent image print data can include data on the position and shape of the first linear portion 181 and the second linear portion 182.

Thereafter, array printing 18 is provided on the base material 11 according to the latent image printing data. Further, the base material 11 is further provided with a visible identification pattern 14, a visualization filter 15, and the like. In the manner described above, the personal authentication medium 1A is obtained.

Note that here, since there are four types of arrangement of the first linear portions 181 and second linear portions 182, the three types of structures described with reference to FIGS. 4 to 6 are insufficient. For example, by using the structures shown in FIGS. 19 and 20, it is possible to increase the types of arrangement of the first linear portions 181 and the second linear portions 182.

FIG. 19 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 20 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2.

The array printing 18 shown in FIG. 19 is the same as the array printing 18 described with reference to FIG. The same is true. Furthermore, the array printing 18 shown in FIG. 20 is the same as the array printing 18 described with reference to FIG. It is similar to

FIG. 21 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 19 is adopted for the array print is observed under the first observation condition. FIG. 22 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 19 is adopted for the array print is observed under the second observation condition. FIG. 23 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 19 is adopted for the array print is observed under the third observation condition.

In the personal authentication medium 1A in which the structure of FIG. 19 is adopted for the array print 18, as shown in FIGS. The boundaries between the gray and light gray areas are tilted corresponding to the boundaries between sub-patterns 18A, 18B and 18C. In this personal authentication medium 1A, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, the moiré displayed by the superposition of the visualization filter 15 and the array print 18 becomes black. , the dark gray portion, and the light gray portion each move in a direction perpendicular to the boundary between the sub-patterns 18A, 18B, and 18C, here, diagonally upward and to the right in the figure.

In addition, even in the personal authentication medium 1A in which the structure of FIG. 20 is adopted for the array print 18, as shown in FIGS. , the boundaries between the dark and light gray areas are tilted corresponding to the boundaries between sub-patterns 18A, 18B and 18C. In this personal authentication medium 1A, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, the moiré displayed by the superposition of the visualization filter 15 and the array print 18 becomes black. , the dark gray portion, and the light gray portion each move in a direction perpendicular to the boundary between the sub-patterns 18A, 18B, and 18C, here, diagonally upward and to the left in the figure.

For the arrays A to D in Table 2, for example, the arrays of the first linear portions 181 and the second linear portions 182 in the array printing 18 of FIGS. 4 to 6, FIGS. 19 and 20 can be adopted. Here, as an example, "array A" represents the arrangement of the first linear part 181 and second linear part 182 employed in the array printing 18 of FIG. It represents the arrangement of the first linear part 181 and the second linear part 182 adopted in the array printing 18, and "array C" represents the arrangement of the first linear part 181 and the second linear part 182 adopted in the array printing 18 of FIG. It represents the arrangement of the second linear portions 182, and “array D” represents the arrangement of the first linear portions 181 and second linear portions 182 employed in the array printing 18 of FIG. 20. .

This personal authentication medium 1A displays a first image I1 including the face image of its owner. Therefore, by using the first image I1, it can be confirmed that the person in possession of the personal authentication medium 1A is the original owner of the personal authentication medium 1A.

Furthermore, the personal authentication medium 1A displays a second image I2 that includes the owner's month of birth. As mentioned above, the gradation of the third image displayed by the personal authentication medium 1A and the shift according to the change in the viewing direction are as follows: Depends on whether it is half year, third quarter or fourth quarter. If the person attempting to forge or alter the personal authentication medium 1A does not know this correspondence, the manufactured counterfeit or altered product may not have the correct correspondence.

Therefore, by checking the relationship between the birth month contained in the second image I2 and the gradation of the third image and the shift according to the change in the viewing direction, counterfeit or altered products of the personal authentication medium 1A can be detected. Can be detected. That is, the month of birth included in the second image displayed by a certain personal authentication medium, the gradation of the third image displayed by the personal authentication medium, and the shift according to the change in the viewing direction are as shown in Table 2, etc. If the correspondence relationship between the authentic product and the authentic product described above is not established, it can be determined that the personal authentication medium is not a genuine product.

Additionally, this example uses four indexes. That is, in this example, the table contains four records. Therefore, compared to the case where the table contains two records, it is possible to reduce the possibility that a person attempting to forge or alter the personal authentication medium 1A will be able to manufacture a counterfeit or altered product with the correct correspondence. .

The number of records that the table contains can be further increased. If the number of records included in the table is further increased, the possibility that a person attempting to forge or alter the personal authentication medium 1A will be able to manufacture a counterfeit or altered product with correct correspondence becomes even lower. Table 3 below is yet another example of a table in which each record includes an index and latent image element data.

The number of records that Table 3 contains is 10. In this table, indexes "0", "1", "2", "3", "4", "5", "6", "7", "8", and "9" are marked with "array array", respectively. "Array A", "Array B", "Array C", "Array D", "Array E", "Array F", "Array G", "Array H", "Array I" and "Array J" are allocated. ing. "Array A", "Array B", "Array C", "Array D", "Array E", "Array F", "Array G", "Array H", "Array I" and "Array J" are , each represents the type of arrangement of the first linear portion 181 and the second linear portion 182, and the types of arrangement are different from each other.

When such a table is used, a latent image code can be generated from the birth date of the person who should own the personal authentication medium 1A. For example, the index is the first digit of the birth date of the person who should own the personal authentication medium 1A. For example, if the person who should own the personal authentication medium 1A was born on the 26th, the index is "6". The latent image code is made up of this index.

Next, this latent image code is referred to the above table to obtain one or more latent image element data corresponding to the one or more indexes. Here, when the index is "0", "array A" is selected as the latent image element data. If the index is "1", "array B" is selected as the latent image element data. If the index is "2", "array C" is selected as the latent image element data. When the index is "3", "array D" is selected as the latent image element data. If the index is "4", "array E" is selected as the latent image element data. If the index is "5", "array F" is selected as the latent image element data. When the index is "6", "array G" is selected as the latent image element data. When the index is "7", "array H" is selected as the latent image element data. When the index is "8", "Array I" is selected as the latent image element data. If the index is "9", "array J" is selected as the latent image element data.

Then, latent image print data is generated from the selected latent image element data. This latent image print data includes data on the relative position and shape of the first linear portion 181 and second linear portion 182 linked to the selected latent image element data, and data on the position and shape of the array print 18. It can be generated from. The latent image print data can include data on the position and shape of the first linear portion 181 and the second linear portion 182.

Thereafter, array printing 18 is provided on the base material 11 according to the latent image printing data. Further, the base material 11 is further provided with a visible identification pattern 14, a visualization filter 15, and the like. In the manner described above, the personal authentication medium 1A is obtained.

Note that here, since there are 10 types of arrangement of the first linear portion 181 and the second linear portion 182, only the five types of structures explained with reference to FIGS. 4 to 6, FIG. 19, and FIG. 20 are used. That's not enough. For example, by using the structures shown in FIGS. 24 and 26, the types of arrangement of the first linear portion 181 and the second linear portion 182 can be increased.

FIG. 24 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 25 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2. FIG. 26 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2.

The array print 18 in FIG. 24 corresponds to a structure in which they are arranged in the Y direction such that the array print 18 in FIG. 5 is located on the left side of the figure, and the array print 18 in FIG. 6 is located on the right side in the figure. There is.

The array printing 18 in FIG. 25 has the same pattern as the array printing 18 described with reference to FIG. 5, except that the boundaries between the sub-patterns 18A, 18B, and 18C are tilted clockwise with respect to the Y direction. The pattern is located on the right side of the figure and is similar to the array printing 18 described with reference to FIG. This corresponds to a structure in which these patterns are arranged in the Y direction so as to be located on the left side in the figure.

In the array printing 18 in FIG. 26, the array of the first linear portions 181 is equal to the array of the concealing portions 151 in each of three areas partitioned by two squares arranged concentrically and with different lengths of sides. The first linear part 181 and the second linear part 182 are arranged so that the position of the first linear part 181 and the second linear part 182 in the Y direction is It has a structure in which the linear portions 181 are shifted by 1/4 of the pitch.

FIG. 27 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 24 is adopted for the array print is observed under the first observation condition. FIG. 28 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 24 is adopted for the array print is observed under the second observation condition. FIG. 29 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 24 is adopted for the array print is observed under the third observation condition.

In the personal authentication medium 1A in which the structure of FIG. 24 is adopted for the array print 18, as shown in FIGS. The half corresponds to the moire described with reference to FIGS. 11 to 13, and the right half in the figure corresponds to the moire obtained by horizontally inverting the moire described with reference to FIGS. 11 to 13. In this personal authentication medium 1A, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, the superimposition of the visualization filter 15 and the array print 18 will cause the overlap of each other in the moire displayed. The black parts that were separated from each other move toward each other. Here, among the black parts that were spaced apart from each other, those located on the left side in the figure move to the right in the figure, and those located on the right side in the figure move to the left in the figure.

FIG. 30 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 25 is adopted for the array print is observed under the first observation condition. FIG. 31 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 25 is adopted for the array print is observed under the second observation condition. FIG. 32 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 25 is adopted for the array print is observed under the third observation condition.

In the personal authentication medium 1A in which the structure of FIG. 25 is adopted for the array print 18, as shown in FIGS. The half corresponds to the moire described with reference to FIGS. 11 to 13, and the right half in the figure corresponds to the moire obtained by horizontally inverting the moire described with reference to FIGS. 11 to 13. In this personal authentication medium 1A, when the viewing direction is sequentially changed from the first viewing direction to the second and third viewing directions, the superimposition of the visualization filter 15 and the array print 18 will cause the overlap of each other in the moire displayed. The black parts that were separated from each other move toward each other. Here, among the black parts that were spaced apart from each other, those located on the left side in the figure move to the right in the figure, and those located on the right side in the figure move to the left in the figure.

In the personal authentication medium 1A in which the structure of FIG. 26 is adopted for the array print 18, as shown in FIGS. The half is similar to the moire described with reference to FIGS. 21 to 23, and the right half in the figure is similar to the moire which is obtained by horizontally inverting the moire described with reference to FIGS. 21 to 23. In this personal authentication medium 1A, when the observation conditions are sequentially changed from the first observation condition to the second and third observation conditions, in the moiré display where the visualization filter 15 and the array print 18 are superimposed, The black part located in the middle left half moves diagonally downward to the left in the figure, and the black part located in the right half in the figure moves diagonally downward to the right in the figure.

FIG. 33 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 26 is adopted for the array print is observed under the first observation condition. FIG. 34 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 26 is adopted for the array print is observed under the second observation condition. FIG. 35 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 26 is adopted for the array print is observed under the third observation condition.

In the personal authentication medium 1A in which the structure of FIG. 27 is adopted for the array print 18, as shown in FIGS. It includes a gray part and a light gray part. In FIG. 33, of the three areas partitioned by two concentric squares with different side lengths, the outer area is black, the middle area is dark gray, and the inner area is black. The area is light gray. In this personal authentication medium 1A, when the observation conditions are sequentially changed from the first observation condition to the second and third observation conditions, in the moiré displayed by the superposition of the visualization filter 15 and the array print 18, the black part is Move towards the center.

In this way, a new array print can be generated by deforming the array print 18 or combining a plurality of array prints 18. Therefore, the arrangements of the first linear portions 181 and the second linear portions 182 employed in the arrangements A to J in Table 3 can be made different from each other.

This personal authentication medium 1A displays a first image I1 including the face image of its owner. Therefore, by using the first image I1, it can be confirmed that the person in possession of the personal authentication medium 1A is the original owner of the personal authentication medium 1A.

The personal authentication medium 1A also displays a second image I2 that includes the owner's date of birth. As described above, the gradation of the third image displayed by the personal authentication medium 1A and the shift according to the change in the viewing direction differ depending on the first digit of the birth date of the owner of the personal authentication medium 1A. If the person attempting to forge or alter the personal authentication medium 1A does not know this correspondence, the manufactured counterfeit or altered product may not have the correct correspondence.

Therefore, by checking the correspondence between the date of birth included in the second image I2 and the gradation of the third image and the shift according to the change in the viewing direction, it is possible to determine whether the personal authentication medium 1A is a counterfeit or altered item. can be detected. That is, the date of birth included in the second image displayed by a certain personal authentication medium, the gradation of the third image displayed by the personal authentication medium, and the shift according to the change in the viewing direction are as shown in Table 3, etc. If the correspondence relationship described with reference to the above is not achieved, it can be determined that the personal authentication medium is not a genuine product.

Furthermore, in this example, the number of indexes is ten. That is, in this example, the table contains 10 records. Therefore, compared to the case where the table contains two or four records, it is less likely that a person attempting to forge or alter the personal authentication medium 1A will be able to manufacture a counterfeit or altered article with the correct relationship. I can do it.

In the example described above, the first linear portion 181 and the second linear portion 182 are black and colorless and transparent, respectively. The first linear portion 181 and the second linear portion 182 may be colored in different colors.

FIG. 36 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2.
The array printing 18 in FIG. 36 is the array printing described with reference to FIG. 5, except that the second linear portion 182 is colored and the color is different from the color of the first linear portion 181. It is the same as 18. For example, the first linear portion 181 is colored in one of cyan, yellow, and magenta, and the second linear portion 182 is colored in another color among cyan, yellow, and magenta. It is colored in the color of Here, as an example, it is assumed that the first linear portion 181 is colored cyan, and the second linear portion 182 is colored magenta.

FIG. 37 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 36 is adopted for the array print is observed under the first observation condition. FIG. 38 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 36 is adopted for the array print is observed under the second observation condition. FIG. 39 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 36 is adopted for the array print is observed under the third observation condition.

In the moire shown in FIG. 37, the part corresponding to the sub-pattern 18A is a cyan part, and the part corresponding to the sub-pattern 18C is a yellow part. Further, the portion corresponding to the sub-pattern 18B produces a subtractive color mixture of cyan and yellow, and is therefore a blue portion. In this personal authentication medium 1A, when the observation conditions are sequentially changed from the first observation condition to the second and third observation conditions, the cyan color part is moves to the right in the figure.

In the example described above, the array print 18 consists of two types of linear parts, namely, the first linear part 181 and the second linear part 182. The array print 18 may be composed of three or more types of linear parts.

FIG. 40 is a plan view showing still another example of a structure that can be adopted for array printing of the personal authentication medium shown in FIGS. 1 and 2.

The array printing 18 in FIG. 40 is the same as the array printing 18 described with reference to FIG. 5, except that the following configuration is adopted. That is, the array print 18 in FIG. 40 further includes a third linear portion 183. Each of the third linear portions 183 has a shape extending in the X direction. In each of the sub-patterns 18A, 18B, and 18C, repeating units each consisting of a first linear portion 181, a second linear portion 182, and a third linear portion 183 are arranged in the Y direction.

The ratio WB2/WB1 of the width WB2 of the second linear part and the width WB1 of the first linear part, and the ratio WB3/WB1 of the width WB3 of the third linear part and the width WB1 of the first linear part. Each is preferably within the range of 3/5 to 7/5. The width WB1 is preferably within a range of 15 to 200 μm. Preferably, the distance S is in the range of 10 to 150 μm. Here, as an example, it is assumed that the width WB3 is equal to the widths WB1 and WB2, and is 2/3 of the width WA1 of the concealing portion 151.

The second linear portion 182 and the third linear portion 183 are colored. The colors of the first linear portion 181, the second linear portion 182, and the third linear portion 183 are different from each other. Here, as an example, the first linear part 181 is colored magenta, the second linear part 182 is colored yellow, and the third linear part 183 is colored cyan. That's it.

FIG. 41 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print is observed under the first observation condition. FIG. 42 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print is observed under the second observation condition. FIG. 43 is a diagram showing the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print is observed under the third observation condition.

In the moire shown in FIG. 41, the part corresponding to the sub-pattern 18A includes a magenta part and a yellow part at an area ratio of 2:1, and the part corresponding to the sub-pattern 18B contains a cyan part. A portion corresponding to the sub-pattern 18C includes a cyan portion and a magenta portion at an area ratio of 2:1. The sub-patterns 18A, 18B, and 18C display colors by subtractive color mixture according to the above-mentioned area ratios. In this personal authentication medium 1A, when the observation conditions are sequentially changed from the first observation condition to the second and third observation conditions, subtractive color mixture is applied to the moiré displayed by the superposition of the visualization filter 15 and the array print 18. The part displaying a specific color moves to the right in the figure.

When the structure of the visualization filter 15 combined with the array print 18 in FIG. 40 is changed, the moiré caused by the overlapping of the visualization filter 15 and the array print 18 is the same as that described with reference to FIGS. 41 to 43. The color display is different from that of .

FIG. 44 shows the relative position of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print and the structure of the visualization filter is changed is observed under the first observation condition. FIG. FIG. 45 shows the relative positions of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print and the structure of the visualization filter is changed is observed under the second observation condition. FIG. FIG. 46 shows the relative position of the visualization filter and the array print when the personal authentication medium in which the structure of FIG. 40 is adopted for the array print and the structure of the visualization filter is changed is observed under the third observation condition. FIG.

In the structure shown in FIGS. 44 to 46, the width WA2 of the transparent part 152 is equal to the width WB1 of the first linear part 181, the width WB2 of the second linear part 182, and the width WB3 of the third linear part 183. Other than this, the structure is the same as that described with reference to FIGS. 40 and 41.

In the moiré shown in FIG. 44, the part corresponding to sub-pattern 18A includes only a magenta color part, and the part corresponding to sub-pattern 18B has a magenta color part and a cyan color part in an area ratio of 1:1. The portion corresponding to the sub-pattern 18C includes only the cyan color portion. That is, in the moire shown in FIG. 41, the part corresponding to sub-pattern 18A is a magenta part, the part corresponding to sub-pattern 18B is a blue part, and the part corresponding to sub-pattern 18C is a cyan part. In this personal authentication medium 1A, when the observation conditions are sequentially changed from the first observation condition to the second and third observation conditions, the magenta color part is moves to the right in the figure.

<Second embodiment>
In the first embodiment, a latent image code consisting of one index is generated, and the entire array print 18 is made to correspond to one index. In contrast, in the second embodiment described below, a latent image code consisting of a plurality of indexes is generated, the array print 18 is divided into a plurality of parts, and a plurality of indexes are made to correspond to these parts.

FIG. 47 is a plan view showing an example of a personal authentication medium that can be manufactured by the method according to the second embodiment of the present invention.

Personal authentication medium 1B shown in FIG. 47 is similar to personal authentication medium 1A described above except for the following points. That is, in the personal authentication medium 1B, the array print 18 is divided into a plurality of parts. Here, it is divided into eight sections each having a substantially square shape. Each of these parts corresponds to the index described above. That is, these eight parts correspond to an eight-digit number representing the latent image code.

Therefore, when the latent image code is an 8-digit number expressed in binary, two or less types of arrangement are adopted for the eight linear portions to represent the number. For example, when expressing the number "11011010" according to Table 1, the eight parts include "array B", "array B", "array A", "array B", "array B" in the array of the linear part. ”, “Array A”, “Array B”, and “Array A” are adopted in this order.

Further, when the latent image code is an eight-digit number expressed in decimal notation, ten or less types of arrangement are adopted for the eight linear portions to represent the number. For example, when expressing the number "01234567" according to Table 3, the eight parts include "array A", "array B", "array C", "array D", and "array E" in the array of the linear part. ”, “Array F”, “Array G”, and “Array H” are adopted in this order.

A latent image code consisting of a plurality of indexes can be generated from a single piece of information. For example, by referring to the nationality of the person who should own personal authentication medium 1B in a table consisting of multiple records each containing a country and an 8-digit number expressed in binary, Obtain the digit number as a latent image code.

Alternatively, the latent image code made up of a plurality of indexes may be a combination of a plurality of codes generated from a plurality of pieces of information. For example, a one-digit number generated from the gender of the person who should own personal authentication medium 1B, a three-digit number generated from the nationality of the person who should own personal authentication medium 1B, and the expiration date of personal authentication medium 1B. An 8-digit number formed by arranging the 4-digit number generated from the year in this order can be used as the latent image code.

It is desirable that the eight moiré patterns displayed by overlapping the above-mentioned eight parts and the visualization filter 15 be easily distinguishable from each other. From this point of view, it is preferable to adopt the following structure for the visualization filter 15 and each part of the array print 18.

FIG. 48 is a plan view showing an example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.
The structure of FIG. 48 differs from the structure described with reference to FIGS. 3, 4, and 8 to 10 in that the moire displayed by the overlapping of the visualization filter 15 and the array print 18 is longer than the concealing portion 151. It is designed to include only one black part extending in the horizontal direction. In this structure, when the dimension in the width direction of the concealing part 151 of the part corresponding to one index of the array print 18 is defined as H, the pitch P1 and the pitch P2 are calculated using the equation: P2=P1×H /(HP1) is set so as to satisfy the relationship shown in FIG.

FIG. 49 is a plan view showing another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.
The structure in FIG. 49 is similar to the structure in FIG. 49 except that the moire is designed to include two black parts each extending in the length direction of the hiding part 151 and arranged in the width direction of the hiding part 151. It is. In this structure, the pitch P1 and the pitch P2 are set to satisfy, for example, the relationship shown in the equation: P2=P1×H/(H−2×P1).

FIG. 50 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.
The structure in FIG. 50 is similar to the structure in FIG. 49 except that the moire is designed to include three black parts that each extend in the length direction of the hiding part 151 and are arranged in the width direction of the hiding part 151. It is. In this structure, the pitch P1 and the pitch P2 are set to satisfy, for example, the relationship shown in the equation: P2=P1×H/(H−3×P1).

FIG. 51 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.
The structure in FIG. 51 is different from the structure described with reference to FIGS. 3, 4, and 8 to 10 in that the pitch P1 and the pitch P2 are equal and the lengths of the first linear part 181 and the second linear part 182 are the same. The structure is transformed into a structure in which the length direction of the concealing portion 151 is slightly tilted counterclockwise with respect to the length direction of the concealing portion 151, and furthermore, the moire displayed by the overlapping of the visualization filter 15 and the array printing 18 is It is designed to include only one black part extending in the width direction of the concealing part 151. In this structure, the lengthwise dimension of the concealing portion 151 of the portion corresponding to one index in the array printing 18 is W, and the lengthwise dimension of the first linear portion 181 and the second linear portion 182 is concealed. When the angle formed with respect to the length direction of the portion 151 is θ, the angle θ is set to satisfy, for example, the relationship shown in the equation: θ=arctan(P2/W).

FIG. 52 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.
The structure in FIG. 52 is similar to the structure in FIG. 51 except that the moire is designed to include two black parts that each extend in the width direction of the hiding part 151 and are arranged in the length direction of the hiding part 151. It is. In this structure, the angle θ is set to satisfy, for example, the relationship shown in the equation: θ=arctan(2×P2/W).

FIG. 53 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.
The structure in FIG. 53 is similar to the structure in FIG. 51 except that the moire is designed to include three black parts that each extend in the width direction of the hiding part 151 and are arranged in the length direction of the hiding part 151. It is. In this structure, the angle θ is set to satisfy, for example, the relationship shown in the equation: θ=arctan(3×P2/W).

FIG. 54 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 55 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.

The structure of FIGS. 54 and 55 differs from the structure described with reference to FIG. 51 in that the pitch P2 is made different from the pitch P1, and the moiré displayed by the overlapping of the visualization filter 15 and the array print 18 is concealed. The black part 151 is designed to include a plurality of black parts each extending in a clockwise direction with respect to the length direction of the part 151 and arranged in the width direction. The moire shown in FIG. 54 and the moire shown in FIG. 55 are different in the width and pitch of the black portion. Such a difference can be made by changing the angle θ and the pitch P2.

FIG. 56 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47. FIG. 57 is a plan view showing still another example of a structure that can be adopted for the visualization filter and part of the array printing in the personal authentication medium shown in FIG. 47.

The structure of FIGS. 56 and 57 differs from the structure described with reference to FIG. 51 in that the pitch P2 is made different from the pitch P1, and the moire displayed by the overlapping of the visualization filter 15 and the array print 18 is concealed. It is designed to include a plurality of black parts each extending in a direction inclined counterclockwise with respect to the length direction of the part 151 and arranged in the width direction. That is, in the structure of FIG. 56, instead of tilting the length direction of the first linear part 181 and the second linear part 182 in the counterclockwise direction with respect to the length direction of the concealing part 151, it is tilted in the clockwise direction. The structure is the same as that of FIG. 54 except that it is tilted toward the side. Moreover, in the structure of FIG. 57, instead of tilting the length direction of the first linear part 181 and the second linear part 182 in the counterclockwise direction with respect to the length direction of the concealing part 151, it is tilted in the clockwise direction. The structure is the same as that of FIG. 55 except that it is tilted toward the side. The moire shown in FIG. 56 and the moire shown in FIG. 57 are different in the width and pitch of the black portion. Such a difference can be made by changing the angle θ and the pitch P2.

This personal authentication medium 1B displays a first image I1 including the face image of its owner. Therefore, using the first image I1, it is possible to confirm that the person in possession of the personal authentication medium 1B is the original owner of the personal authentication medium 1B.

In addition to the first image I1, the personal authentication medium 1B displays a second image I2 that includes the owner's individual information. The third image displayed by the personal authentication medium 1B, that is, the combination of the above-mentioned moiré, differs depending on the individual information of the owner of the personal authentication medium 1B. If a person attempting to forge or alter the personal authentication medium 1B does not know this correspondence, it is not always possible to manufacture a counterfeit or altered product with the correct correspondence.

Therefore, by checking the relationship between the individual information included in the first image I1 and the second image I2 and the moiré combination, it is possible to determine the authenticity of the personal authentication medium 1B. In other words, if the individual information included in the first and second images displayed by a certain personal authentication medium and the combination of moiré displayed by that personal authentication medium do not correspond to the genuine product, the personal authentication medium It can be determined that the product is not genuine.

Furthermore, in manufacturing the personal authentication medium 1B, as described above, a latent image code consisting of a plurality of indexes is generated, the array print 18 is divided into a plurality of parts, and a plurality of indexes are made to correspond to these parts. Therefore, the amount of information recorded in the array print 18 can be increased, thereby reducing the possibility that a person attempting to forge or alter the personal authentication medium 1B will be able to produce a counterfeit or altered product with the correct relationship. can do.

Furthermore, even if a pattern similar to the above-mentioned moire is printed on one side of a base material, it is not possible to reproduce changes in moire in response to changes in viewing conditions. An extremely sophisticated technique is required to analyze the structure of the authentic personal authentication medium 1A and accurately reproduce it in a counterfeit product.

Therefore, according to the above-described technology, it is possible to make it difficult to forge or alter a personal authentication medium.

<Modified example>
Various modifications are possible to the techniques described in the first and second embodiments.

For example, the visible identification pattern 14, the visualization filter 15, and the array print 18 are arranged such that a part of the visible identification pattern 14 overlaps a part of the visualization filter 15 and a part of the array print 18 when observed from the Z direction. It may be placed in For example, a portion of the visualization filter 15 and the array print 18 may be arranged so as to overlap a portion of the first image I1. Alternatively, a portion of the visualization filter 15 and the array print 18 may be arranged so as to overlap a portion of the first image I1, for example, a portion of the first image I1 that displays the name. . Information that can be read from the first image I1 or information that can be read from the superimposed portion of the second image I2, for example, the gender of the owner of the personal authentication medium 1A or 1B, the visualization filter 15, and the arrangement. Moiré displayed by superimposition with the print 18 may be linked.

In the second embodiment, the moiré that is displayed when the sections formed by dividing the array print 18 are overlapped with the visualization filter 15 needs to be distinguishable from each other. For this distinction, similarly to the first embodiment, movement of a black portion or the like according to a change in the viewing direction can also be used. It is easy to confirm the direction of movement of the black part, etc. in response to a change in the viewing direction. Furthermore, by changing the viewing direction, it is also possible to acquire a plurality of images in which the positions of black parts and the like differ. Therefore, when the movement of the black portion or the like in response to a change in the viewing direction is used to distinguish moiré, it becomes possible to read the information recorded on the array print 18 more reliably.

The visualization filter 15 may be omitted from the personal authentication media 1A and 1B.
For example, a verification tool including the visualization filter 15 is prepared. This verification tool has a structure in which a visualization filter 15 is provided on a transparent base material in the form of a film, sheet, or plate, for example. Then, this verification tool and the personal authentication medium 1A or 1B without the visualization filter 15 are arranged so that the visualization filter 15 and the array print 18 overlap. This makes it possible to read the information recorded on the array print 18.

Alternatively, a verification device capable of superimposing and displaying an image acquired by imaging and a pattern corresponding to the visualization filter 15 is prepared.

An example of the verification device is a mobile terminal with a camera function, such as a smartphone, which is equipped with an application that can display a superimposition of an image acquired by imaging and a pattern corresponding to the visualization filter 15.

Another example of a verification device is a fixed device that includes an imaging device, a central processing unit, main storage, auxiliary storage, and a user interface. The imaging device includes, for example, an imaging element, a support that supports a personal authentication medium, and a movement mechanism that relatively moves the imaging element and the support so that the imaging direction changes. The central processing unit includes a central integrated circuit. Main storage includes random access memory. Secondary storage includes one or more of a hard disk drive and a solid state drive. The user interface includes an input device and an output device. The input device includes, for example, one or more of a keyboard, a mouse, and a touch panel. Output devices include displays such as liquid crystal displays and organic electroluminescent displays.

In this verification device, the auxiliary storage device stores a program that can display a superposition of an image acquired by the imaging device and a pattern corresponding to the visualization filter 15. The central processing unit performs arithmetic processing according to this program and controls the operation of each device. Thereby, the display displays the superposition of the image acquired by the imaging device and the pattern corresponding to the visualization filter 15.

In this way, even if the visualization filter 15 is omitted from the personal authentication media 1A and 1B, the information recorded on the array print 18 can be read by using the verification tool or verification device. . Therefore, the same authenticity determination as above can be performed.

(Example 1)
The personal authentication medium 1A shown in FIGS. 1 and 2 was manufactured by the method described with reference to FIG. 17 and Table 1. Here, "array A" and "array B" in Table 1 are the array described with reference to FIG. 4 and the array described with reference to FIG. 5, respectively.

First, a transparent card was prepared as the base material 11. This transparent card was made by shaping a polycarbonate resin into a general card mold and curing it, and had a thickness of about 1 mm.

Next, the index in Table 1 was calculated from the date of birth of the person who should own the personal authentication medium 1A. As a result, the index was "1". Therefore, it was decided to adopt the structure described with reference to FIG. 5 for the array printing 18.

Next, a visible identification pattern 14, a visualization filter 15, and an array print 18 were provided on the base material 11 using a card printer CP500 manufactured by Toppan Printing Co., Ltd.

Specifically, first, an intermediate transfer medium was prepared. This intermediate transfer medium has a release layer/protective layer and an image receiving layer/adhesive layer provided on a base film in this order.

Next, a visible identification pattern 14 and a visualization filter 15 were formed on the intermediate transfer medium using a thermal head.

The portion of the visible identification pattern 14 that displays the first image I1 was formed by sequentially transferring black, cyan, magenta, and yellow inks to the image-receiving layer/adhesive layer. The portion of the visible identification pattern 14 that displays the second image I2 was formed by transferring black ink to the image-receiving layer/adhesive layer.

The structure shown in FIG. 3 was adopted as the visualization filter 15. The pitch P1 was 250 μm, and the widths WA1 and WA2 were 125 μm. The visualization filter 15 was formed by transferring black ink in the shape of the concealing portion 151 to the image receiving layer/adhesive layer.

In this way, a laminate including a release layer/protective layer, an image receiving layer/adhesive layer, a visible identification pattern 14, and a visualization filter 15 was formed on the base film. This laminate was transferred from the base film to one side of the base material 11 using a heat roller.

Next, array prints 18 were formed on the same intermediate transfer medium as above using a thermal head. The structure shown in FIG. 5 was adopted for the array printing 18. Here, the part corresponding to the character string "SE", the part corresponding to the character string "CU", and the part corresponding to the character string "RE" are defined as subpatterns 18A, 18B, and 18C, respectively. Furthermore, the pitch P2 was 250 μm, the widths WB1 and WB2 were 125 μm, and the distance S was 62.5 μm. The array print 18 was formed by transferring black ink in the shape of the first linear portion 181 to the image-receiving layer/adhesive layer.

In this way, a laminate including the release layer/protective layer, the image receiving layer/adhesive layer, and the array print 18 was formed on the base film. This laminate was transferred from the base film to the other surface of the base material 11 using a heat roller. In this transfer, the array printing 18 faces the visualization filter 15 with the base material 11 in between, and the length direction of the first linear part 181 becomes parallel to the length direction of the concealing part 151. So I went.

In the manner described above, the personal authentication medium 1A shown in FIGS. 1 and 2 was obtained.

Next, this personal authentication medium 1A was observed under a white light source. As a result, as the observation conditions are sequentially changed from the first observation condition described with reference to FIG. 7 to the second and third observation conditions, the third image displayed by the personal authentication medium 1A becomes as shown in FIG. image I3A in FIG. 15, image I3B in FIG. 15, and image I3C in FIG. 16 in sequence. That is, in the third image, it was confirmed that the black portion etc. moved in the X direction.

(Example 2)
When the personal authentication medium 1A or 1B is manufactured on demand, at least a portion of the visible identification pattern 14 and the array printing 18 are usually provided at the positions of pixels arranged in a grid. Consists of a collection of multiple dots. Therefore, the possible arrangement of these dots depends on the resolution of the printing device.

In this example, the personal authentication medium 1B shown in FIG. 47 was manufactured using a printing device with a resolution of 600 dpi. Here, the structure shown in FIG. 3 was adopted for the visualization filter 15, and the structure shown in FIG. 4 was adopted for the array printing 18. Samples 2-1, 2-2, 2-3, 2-4, and 2-5 were created as personal authentication media 1B, with widths WB1 and WB2 having the values shown in Table 4 below.

In each sample, the visualization filter 15 and the printed array 18 each had a rectangular shape with a dimension in the X direction of 2 mm and a dimension in the Y direction of 100 pixels, that is, 4.2 mm. Further, in each sample, the widths WA1 and WA2 were set to 5 pixels (200 μm) and 4 pixels (160 μm), respectively.

Next, for each of these samples, moiré caused by the overlapping of the visualization filter 15 and the array print 18 was examined. As a result, these samples displayed different moiré patterns. Table 4 below lists the periods of these moires, that is, the pitches of the black parts in these moires.

As shown in Table 4, by changing the widths WB1 and WB2, the moire period could be changed. For example, when each of the widths WB1 and WB2 was set to 3 pixels, the moire period could be set to 18 pixels. That is, about 5 moire fringes could be generated. Further, when each of the widths WB1 and WB2 was set to 5 pixels, the moire period could be set to 90 pixels. That is, about one moiré stripe could be generated.

In addition, the brightness difference ΔL between bright and dark areas in moiré was greater than 10 and less than 95 in the case of transmission observation, and greater than 20 and less than 95 in the case of reflection observation. From this result, we were able to confirm that it is possible to read moiré using a smartphone camera and application.

(Example 3)
In the personal authentication medium 1B of FIG. 47, instead of dividing the array print 18 into 6 parts, it is divided into 15 parts, and each of these parts adopts one of the structures of the samples in Example 2. Manufactured. Here, as in Example 2, each portion was shaped like a rectangle with a dimension in the X direction of 2 mm and a dimension in the Y direction of 4.2 mm. The array print 18 had a rectangular shape with a dimension in the X direction of 30 mm and a dimension in the Y direction of 4.2 mm. Note that the moiré patterns displayed by the five samples in Example 2 were assigned indexes "0", "1", "2", "3", and "4".

Regarding the personal authentication medium 1B obtained in this way, moiré displayed by the overlapping of the visualization filter 15 and the array print 18 was imaged with a smartphone camera. This moiré image was then decoded using a smartphone application. As a result, it was possible to correctly decode the 15 moire arrays into 15 number arrays each consisting of an integer from 0 to 4. In this way, ⁵¹⁵ pieces of information, that is, about 34 bits of information, could be embedded in the array print 18.

1A... Personal authentication medium, 1B... Personal authentication medium, 2... Printing device, 11... Base material, 12... Protective layer, 13... Adhesive layer, 14... Visible identification pattern, 15... Visualization filter, 16... Protective layer, 17...adhesive layer, 18...array printing, 18A...subpattern, 18B...subpattern, 18C...subpattern, 21...transferring material, 22...feeding roller, 23...winding roller, 24...thermal ink ribbon, 25... Sending roller, 26... Winding roller, 27... Thermal head, 28... Platen roller, 111... Identification area, 112... Verification area, 151... Concealing part, 152... Transmitting part, 181... First linear part, 182... First 2nd linear part, 183...Third linear part, I1...1st image, I2...2nd image, I3A...image, I3B...image, I3C...image, P1...pitch, P2...pitch, S...distance, S1 ...Step, S2...Step, S3...Step, VP1...Position, VP2...Position, VP3...Position, WA1...Width, WA2...Width, WB1...Width, WB2...Width, WB3...Width.

Claims (11)

A process of generating latent image printing data from individual information;
recording part or all of the individual information data as a visible identification pattern that is recognizable by naked eye observation and provided on the first portion of the substrate with an adhesive layer in between;
providing an array print on the second portion of the substrate with an adhesive layer interposed therebetween in accordance with the latent image print data;
The generation of the latent image print data includes:
generating a latent image code consisting of one or more indexes from at least a part of the digital code representing the individual information;
One or more latent image element data corresponding to the one or more indexes are obtained by referring to a table consisting of a plurality of records in which indexes and latent image element data corresponding to the indexes are recorded, and the one or more latent image element data corresponding to the one or more indexes are obtained. A method for manufacturing a personal authentication medium, comprising the step of generating the latent image print data from latent image element data. In one or more of the plurality of records, the latent image element pattern corresponding to the latent image element data includes three or more sub-patterns arranged in a first direction, and each of the three or more sub-patterns is arranged in the first direction. including a plurality of linear parts each extending in a direction and arranged spaced apart from each other in a second direction intersecting the first direction, and adjacent ones of the three or more sub-patterns are The method for manufacturing a personal authentication medium according to claim 1, wherein the position is shifted in the second direction. 3. The method of manufacturing a personal authentication medium according to claim 1, wherein the one or more indexes are two or more indexes, and the one or more latent image element data are two or more latent image element data. 4. The method for manufacturing a personal authentication medium according to claim 1, wherein the array printing is provided on the base material by thermal transfer. 5. The method for manufacturing a personal authentication medium according to claim 1, further comprising the step of providing a visualization filter on the base material with an adhesive layer interposed therebetween. 6. The method of manufacturing a personal authentication medium according to claim 5, wherein the array printing and the visualization filter are provided so as to face each other with the base material in between. 7. The method for manufacturing a personal authentication medium according to claim 1, wherein the visible identification pattern includes a visible image code. preparing a personal authentication medium including a base material and an array print provided thereon;
a step of acquiring verification information from moiré displayed when the array printing is superimposed on a visualization filter consisting of halftone dots or parallel lines;
a step of acquiring individual information from the personal authentication medium or its owner;
An authentication method including a step of comparing the verification information with the individual information. 9. The authentication method according to claim 8, wherein the visualization filter is provided on the base material or on an adhesive layer on the base material. 9. The authentication method according to claim 8, wherein acquiring the verification information includes stacking the personal authentication medium and a verification tool including the visualization filter. 11. The authentication method according to claim 8, wherein the acquisition of the verification information includes acquisition of information regarding a change in moiré caused by tilting the personal authentication medium.