JP2012016884A - Image forming body and information authentication medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming body and an authentication medium where information identification can easily be made visually in the image forming body, and which, at the same time, is equipped with the preventive property against forgery and tampering.SOLUTION: The information authentication medium has a base material, a first authentication information display section which color displays the first authentication information, a second authentication information display section which displays the second authentication information in dots by two or more cells which consist of diffraction grating or a structure prepared with diffraction grating-like unevenness, an intermediate layer and a protective layer, and the first authentication information display section is laminated on the base material on one surface, and the intermediate layer is laminated on the base material where the first authentication information display section is placed so as to cover the first authentication information display section, and the second authentication information display section is arranged at the opening part of the intermediate layer, and furthermore, the protective layer is laminated on the opposite side of the base material surface where the intermediate layer and the second authentication information display section are arranged, and the first authentication information and the second authentication information are formed from the same authentication information.

Description

The present invention relates to an image forming body that prints, prints, or draws a face image or fingerprint that is a specific key on a booklet such as a passport or a visa, or an information authentication medium such as a card. Identification information such as face and fingerprint images can be easily formed by combining a diffraction grating or a structure with projections and depressions on the diffraction grating and on-demand printing technology. The purpose is to make it easier to counterfeit and falsify, or to make it easier for an examiner to detect.

Many information authentication media such as passports and ID (identification) cards use facial images to enable visual information authentication. For example, in a passport, conventionally, photographic paper on which a face image is printed is pasted on a booklet. However, such passports may be tampered with by reprinting photographic prints.

  For these reasons, in recent years, there is a tendency to digitize facial image information and reproduce it on a booklet. As this image reproduction method, sublimation (heat transferable) dyes, thermal transfer recording methods using transfer ribbons using resin-type melting type or wax-melting type in which pigments are dispersed, or electrophotography are being studied. Yes.

In addition to the above method, the image reproduction method to the passport includes a recording method using an ink jet printer (for example, see Patent Document 1), a laser printing recording method using a CO2 or YAG laser and a thermal color former (for example, Patent Document 2). Further, there is a laser engraving print recording method (for example, refer to Patent Document 3) in which carbon (C) existing in the base material is used to print and record also in the depth direction of the base material.

  Furthermore, as an image display body containing this type of recognition data, an image pattern formed based on the image data is provided on a card substrate such as polyvinyl chloride, or in addition to the image pattern, a hologram or It is known to have a so-called OVD (Optical Variable Device) image typified by an image obtained by using an optical thin film using a diffraction grating or multilayer interference (an effect such as color shift can be obtained by optical design). Yes.

  These OVD techniques for holograms and diffraction gratings require advanced manufacturing techniques and are difficult to duplicate, and thus have been used for cards such as credit cards, ID cards, and prepaid cards as effective forgery prevention means. Furthermore, due to its high decorativeness, it is often used for packaging materials, books, pamphlets, POPs, and the like. As a means for sticking these OVDs to articles, a method of transferring and forming using a transfer foil has been conventionally employed. This type of transfer consists of a release layer, a relief layer on which a hologram or diffraction grating image pattern is formed on a support, a reflective layer formed by a known thin film forming means, and an adhesive layer in sequence. Things are known. These OVD patterns (holograms and diffraction grating patterns) engraved on the transfer foil are replicated in large quantities by a well-known method in which a minute uneven pattern is replicated on a nickel-type press plate and heated to the relief layer.

In addition, the reflective layer can be formed as a transparent hologram or a transparent diffraction grating by forming a transparent material having a different refractive index by a known thin film forming means such as a vacuum deposition method (hereinafter referred to as a transparent thin film layer). This is a known technique. In this case, it is clear from an optical point of view that the greater the difference in refractive index between the relief layer and the transparent thin film layer, the greater the reflectance. However, here in general,
(Refractive index of relief layer) <(Refractive index of transparent thin film layer)
There is a relationship.

The hologram or diffraction grating structure thus obtained is used as a means for preventing counterfeiting, such as credit cards, cash cards, membership cards, employee cards, prepaid cards, driver's licenses, gift cards, gift certificates, etc. In addition to various paper certificates such as stock certificates, various forms such as application forms, receipts, and copy slips, various booklets such as passports, passbooks, and pension notebooks, displays such as covers and panels such as books and notebooks, etc. It is used by sticking to a part or the whole. In addition, the whole described in the present invention has a conceptual meaning, regardless of a pattern, a pattern, or the like, a spot shape, a stripe shape, a thing stuck on a lattice, a regular shape, an irregular shape halftone dot Also included are those stuck with dots in the shape of a circle.

Such an OVD transfer foil performs a sufficient function as an anti-counterfeiting effect, but is formed by thermally transferring an OVD transfer layer on the image after forming an image such as a face photograph like a passport. At present, when the forgery technology has been developed, there is a possibility that the transfer layer is once removed by some method, the image data or the like is altered, and then the OVD transfer foil is placed again.

In addition, there is a possibility that image data may be falsified by selecting a person whose face shape / atmosphere is similar to the face photo of an authentication medium such as a stolen passport and pasting the printed photo over the face. .

Also, considering the widespread use of printers such as a sublimation transfer method, a heat-melting transfer ribbon method, or an electrophotographic method as a means for forming image information such as a facial photograph, image formation is now considered. It is becoming difficult to say that it is always difficult to form a new image in the area after removing the portion.

In order to solve the above problems, a method of putting a plurality of pieces of information for identifying an individual such as a face photograph is considered. One way to do this is to form image information such as a facial photograph with a hologram or diffraction grating, which makes it necessary to alter the hologram image at the same time as falsification of the face photograph with a color image. (For example, refer to Patent Document 4).

JP 2002-226740 A JP 49-131142 A JP 2006-123174 A Japanese Patent Application No. 2009-187654

  An object of the present invention is an invention made in view of the above-mentioned problems of the prior art, and an image forming body that requires high security (typically a passport, a visa, or various cards). In contrast, it provides one of the ways to improve the tamper resistance of face photos, etc., so that even if they are fraudulent, they can be easily discovered by observing the suspected fraud An object of the present invention is to provide an information authentication medium for forming an image forming body having such easy-to-find performance.

  The invention according to claim 1, which has been made to achieve the above object, includes at least a base material, a first authentication information display unit that displays the first authentication information in a color, and second authentication information in a diffraction grating. A second authentication information display unit that displays a set of dots made of a plurality of cells made of a structure, an intermediate layer, and a protective layer, and displays the first authentication information on one surface of the substrate. And an intermediate layer is laminated on the base material on which the first authentication information display unit is disposed so as to cover the first authentication information display unit, and the intermediate layer includes the first authentication information An opening is provided in a portion where the display unit is not disposed, the second authentication information display unit is disposed in the opening of the intermediate layer, and further, a base of the intermediate layer and the second authentication information display unit is provided. The protective layer is laminated on the surface opposite to the material side, the first authentication information and the second Testimony information is information authentication medium characterized by comprising a recognizable credentials same subject.

The invention according to claim 2 is the information authentication medium according to claim 1, wherein the intermediate layer under the second authentication information display part is partially removed.

The invention according to claim 3 is characterized in that the intermediate layer under the second authentication information display part is removed with a smaller area than the second authentication information display part. The information authentication medium described in 1.

According to a fourth aspect of the present invention, there is provided the information authentication medium according to any one of the first to third aspects, wherein a diffraction grating layer is provided on the first authentication information display unit via the intermediate layer. It is.

According to a fifth aspect of the present invention, in the information authentication medium according to any one of the first to fourth aspects, the thickness of the intermediate layer and the protective layer is 1 μm to 20 μm, respectively. It is.

  According to the present invention, the first authentication information display section displayed in color for the examiner who identifies whether the person who owns the information authentication medium is the true owner or whether the medium is genuine. Since the same image as the image in (2) is provided in the second authentication information display unit by a diffraction grating or a structure having projections and depressions in the shape of a diffraction grating, it is possible to easily identify the person by visually comparing the two images. . In addition, when attempting to tamper with this information authentication medium, it is necessary to form both the first authentication information display unit that is displayed in color and the second authentication information display unit that is configured with a diffraction grating or the like. Can be difficult. Furthermore, since the first authentication information display unit displayed in color and the second authentication information display unit configured by a diffraction grating or the like are provided between different layers, any layer is peeled off from the surface or the base material. When trying to falsify the image from the back side, it is necessary to destroy any one of the adhesive layer, intermediate layer, and protective layer other than the layer on which the image is formed, so that falsification can be prevented. . Or it can be easily detected even if fraud such as tampering is performed.

Further, the second authentication information display unit of the personal authentication medium is provided so as to overlap with the intermediate layer partially removed within a certain area, whereby the first authentication information display unit and the second authentication information display If one of the layers having a portion is peeled off from the front surface or the base material and the image is to be tampered with from the back surface, the second authentication information display portion is destroyed, so that the effect of preventing tampering can be enhanced.

Further, the second authentication information display unit of the personal authentication medium is provided so as to cover the intermediate layer from which a certain area is removed, so that the first authentication information display unit and the second authentication information display unit are provided. If one of the layers is peeled off from the front surface or base material and the image is altered from the back side, a part of the second authentication information display part is destroyed and remains on the protective layer side, thereby further enhancing the effect of preventing falsification. Can do.

  As described above, it is possible to improve the tamper resistance and realize an information authentication medium that can easily find a suspected fraudulent product even if those frauds are made.

The top view which showed an example of the information authentication medium of this invention, and sectional drawing on XX. Sectional drawing which showed an example of the information authentication medium of this invention. Sectional drawing which showed an example of the information authentication medium of this invention. Sectional drawing which showed an example of the information authentication medium of this invention. Sectional drawing which showed an example of the information authentication medium of this invention. Sectional drawing which showed an example of the information authentication medium of this invention. Schematic which showed an example of the process of manufacturing the information authentication medium of 1st invention in this invention.

The invention in the present invention is to display a visible image such as a face image as first authentication information on the base material 11 in a colored manner as shown in the schematic diagram and the cross-sectional view of the information authentication medium shown in FIG. A first authentication information display unit 15 is provided, and a second authentication information display unit 16 that displays authentication information of the same person as the authentication information displayed on the first authentication information display unit 15 includes a plurality of diffraction gratings. By providing the cells in a dot shape, visible image information can appear when a light source with a certain angle is irradiated, so that authentication can be performed by comparing the first authentication information with the second authentication information. Is.
Furthermore, in the present invention, the layers in which the first authentication information display unit 15 and the second authentication information display unit 16 are provided are different, and the first authentication information display unit 15 and the second authentication information display unit 16 are rewritten. Needs to peel off the printed portion and the diffraction grating structure from the base material 11 or the adhesive layer 12 to scrape the face photograph and the diffraction grating structure to newly provide different information. Further, the face photograph and the diffraction grating structure are in contact with different layers, and it is difficult to peel off each of them and make it difficult to falsify them.

  2 and 3 are cross-sectional views of the information authentication medium in the present invention, in which first authentication information display portions 25 and 35 are provided between the adhesive layers 22 and 32 and the intermediate layers 23 and 33, and the adhesive layers 22 and The second authentication information display units 26 and 36 are provided between the protective layer 24 and the protective layers 24 and 34.

  In FIG. 3, the second authentication information display unit is provided so as to cover a part of the intermediate layer, whereby the diffraction grating structure unit is peeled off from the base material 31 or the adhesive layer 32 to provide new information. In this case, a part of the second authentication information display unit must be destroyed. For this reason, tampering becomes more difficult, and even if tampering is attempted, traces of tampering can be easily identified.

4 and 5 are cross-sectional views of the information authentication medium in the present invention, and the first authentication information display portions 45 and 55 are covered between the adhesive layers 42 and 52 and the intermediate layers 43 and 53 so as to be covered with the intermediate layer. Furthermore, the second authentication information display unit 45 is provided on the surface of the adhesive layers 42, 52 on the opposite side of the base material 41, 51, and the second authentication information display unit 45 is provided. The protective layer 44, 54 is provided on the surface opposite to the substrate.
If an attempt is made to tamper with the information authentication medium having the configuration shown in FIG. 4, the second authentication information display unit can be replaced by cutting the diffraction grating structure of the second authentication information display unit and pasting new information while leaving the intermediate layer. It is necessary to attach. Therefore, tampering becomes even more difficult, and even after tampering, the trace of tampering can be easily identified.
In FIG. 5, the second authentication information display unit is provided so as to cover a part of the intermediate layer, and for the same reason as in FIG. 3, tampering becomes even more difficult.

  In FIG. 6, a diffraction grating layer 67 is provided on the first authentication information display unit 65 via an intermediate layer 63. By providing the diffraction grating layer 67 on the upper surface of the first authentication information display section or the entire intermediate layer, it is possible to easily determine the falsified trace even if it is attempted to falsify the information authentication medium 6 by superimposing a face photograph or the like. In addition, the effect of preventing forgery is further increased. Note that the diffraction grating layer 67 may be provided on a part of the upper surface of the intermediate layer.

  FIG. 7 is a schematic view showing an example of a process for manufacturing the information authentication medium of the first invention in the present invention. In the schematic diagram in FIG. 7, instead of printing an image directly on the information authentication medium 6, a colored ink ribbon 133 is once printed on the intermediate layer transfer film by the thermal head 131, so that the first authentication information display unit is displayed. After that, the image and the intermediate layer are transferred to the information authentication medium 6 by the heat pressure of the heat roll 137. At this time, it is set in advance so that a certain area portion of the intermediate layer is removed. In addition to the above steps, the second authentication information display unit is formed by printing the diffraction grating ribbon 134 on the protective layer transfer film with the thermal head 132, and then the heat pressure of the heat roll 138 is applied to the information authentication medium 6. Thus, the image and the protective layer are transferred to obtain the information authentication medium 6.

  Further, by providing a diffraction grating layer on one or both of the intermediate layers 13, 23, 33, 43, 53 and the protective layers 14, 24, 34, 44, 54, further counterfeiting・ An anti-falsification effect can be expected.

  The size of the information authentication medium 1, 2, 3, 4, 5, 6 is not particularly limited, but is preferably a size that is easy to carry, and is approximately 95 × 150 mm of an AD card for Olympics, etc., passport data A size of about 125 × 88 mm of a page and a size of about 86 × 54 mm of a credit card are generally used.

The base materials 11, 21, 31, 41, 51, 61 are various papers such as paper, coated paper, and synthetic paper (polypropylene, polystyrene, or a composite material obtained by bonding them to paper) as a support. , Vinyl chloride resin sheet, polyethylene terephthalate base film, transparent polyethylene terephthalate film, polyethylene naphthalate base film and other plastic films or sheets, various metal films or sheets, and various ceramics Examples thereof include films and sheets. These colors may be a single color or a combination of two or more colors, and need not be particularly limited, such as having a pattern or pattern, but in order to enhance the clarity of personal authentication information formed in a later process In addition, white pigments such as titanium white, magnesium carbonate, zinc oxide, barium sulfate, silica, talc, clay, calcium carbonate and the like are preferably added. The thickness of the support is usually 20 to 1000 μm, preferably 50 to 800 μm.

  The adhesive layers 12, 22, 32, 42, 52, 62 are integrally formed by adhering the base material to the first authentication information display unit or the second authentication information display unit and the intermediate layers 13, 23, 33, 43, 53, 63. It is to make it. As materials for bonding them, thermoplastic resins such as vinyl chloride vinyl acetate copolymer, ethylene vinyl acetate copolymer, and polyester resin are usually used. Note that, when the intermediate layers 13, 23, 33, 43, 53, 63 and the base material have good adhesion, the adhesive layer can be omitted.

The intermediate layers 13, 23, 33, 43, 53, 63 and the protective layers 14, 24, 34, 44, 54, 64 are formed by bonding the respective layers together.
Since the intermediate layer used in the present invention partially covers the main surface provided with the first lang = EN-US> 1 authentication display section, it is transparent to increase the visibility of the first authentication display section. Desirably, for example, thermoplastic resins such as polyurethane resin, polycarbonate resin, polystyrene resin and polyvinyl chloride resin, unsaturated polyester resin, melamine resin, epoxy resin, urethane acrylate, urethane methacrylate, polyol acrylate, polyol methacrylate, melamine Thermosetting resins such as acrylate, melamine methacrylate, triazine acrylate and triazine methacrylate style = 'font-size: 10.5pt; font-family: "MS Mincho"'>, or a mixture thereof can be used. Furthermore, the protective layer is a thermoplastic resin, a thermosetting resin, an ultraviolet ray as long as it is a material that has a role of protecting from scratches, dirt, etc. that obstruct the discrimination of the identification images of the first authentication information display unit and the second authentication information display unit. Alternatively, any one of electro-curing resins may be used, but when transferring the first authentication information display section and the second authentication information display section in the lower layer to an intermediate layer or a protective layer, a film base material (not shown) as a base ), And indirect transfer to a substrate, adhesive layer or intermediate layer for use. In view of flexibility and foil breakage, a thermoplastic resin is preferred. Examples include thermoplastic polyacrylate resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, chlorinated polypropylene resins, epoxy resins, polyester resins, nitrocellulose resins, and thylene. Resins such as acrylate resins, polyether resins, and polycarbonate resins can be used alone or in combination. In addition, in consideration of foil breakage and abrasion resistance, various waxes such as petroleum wax and plant wax, higher fatty acids such as stearic acid and metal salts and esters thereof, silicone oil and other lubricants, fluororesin powder, Organic fillers such as polyethylene powder, silicone fine particles and acrylonitrile fine particles, and inorganic fillers such as silica fine particles can also be added.

  A diffraction grating layer can be provided on the intermediate layer or the protective layer, or on part or all of both, and by providing these, the anti-tampering effect can be further enhanced.

  The thickness of the intermediate layer and the protective layer is preferably between 1 μm and 20 μm. If the thickness is small, the intermediate layer and the protective layer may be difficult to detect even if the intermediate layer and the protective layer are altered. Even if the thickness is large, if a photograph of a face is provided on a commercially available film and attached well, there is a risk that it will not be possible to tell whether it has been tampered with. Therefore, it is preferable that the thickness difference is between 1 μm and 20 μm so that a thickness difference can be easily found by visual inspection and can be prevented from being tampered with by printing on a commercially available film and attached to an information authentication medium.

The first authentication information display section is provided for the examiner to determine whether the person who owns the information authentication medium is the person himself / herself and proves his / her identity. Photos, fingerprints, signs, etc. can be provided. Furthermore, in the case of a face photograph, either color or black and white may be used.
As a method for providing the first authentication information display section, sublimation transfer using an ink ribbon in addition to the commonly used printing methods such as offset printing, gravure printing, screen printing, flexographic printing, and letterpress printing. It may be formed by any method such as a method of printing on a substrate, an adhesive layer, an intermediate layer or a protective layer, a method of transferring by thermal melting using an ink ribbon, an ink jet method, or a toner fixing method.

Furthermore, there is a method of printing directly on a substrate or an adhesive layer. The laser engraving method is a configuration printed on the surface and inside of a substrate. The color can be developed in the depth direction by applying energy with a laser, which makes the method effective in preventing tampering.

The 2nd authentication information display part in the present invention is displayed in the shape of a dot by a plurality of cells which consist of a diffraction grating or a structure which provided unevenness in the shape of a diffraction grating. The cell can change the display image according to the observation angle by setting a plurality of types of gradations by controlling the direction, angle, brightness, and the like of diffracting external light.
As diffraction grating parameters,
(1) Spatial frequency of diffraction grating (pitch of grating line: number of grating lines per unit length)
(2) Direction of diffraction grating (direction of grating line)
(3) Diffraction grating drawing area (arrangement of diffraction grating cells)
According to (1) above, the color at which the diffraction grating pattern appears to shine changes with respect to the fixed point, and according to (2) above, the direction at which the diffraction grating cell appears to shine changes, A display image (such as authentication information) is determined in accordance with (3) above. A plurality of cells composed of diffraction gratings are arranged in a dot shape inside the second authentication information display unit, and a diffraction grating in which these parameters are changed for each cell (image) is formed to provide directivity. A display image having gloss can be formed. In addition to the above, a cell with multiple gradations can be created by changing the shape, thickness, material, size, etc. of each cell, and each cell can be selected as appropriate according to the purpose, purpose, and authentication information to be displayed. Then, a plurality of authentication information can be displayed.

  The material used for the cell of the diffraction grating is preferably a resin that has good moldability, is less likely to cause unevenness, can produce a bright reproduced image, and has good adhesion to the substrate, the protective layer, and the adhesive layer. For example, thermoplastic resins such as polyurethane resin, polycarbonate resin, polystyrene resin, polyvinyl chloride resin, unsaturated polyester resin, melamine resin, epoxy resin, urethane (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, triazine A thermosetting resin such as (meth) acrylate or a mixture thereof, or a thermoformable material having a radical polymerizable unsaturated group can be used, and a diffraction grating can be formed by other than the above. Any material having stability can be used. It is further preferable to use the above material as a visible light transmitting layer that transmits visible light.

  The shape of the cell is not particularly limited, but the shape on the visible surface side may be a cube made of a polygon such as a circle, an ellipse, a triangle or a quadrangle, or a cone or a quadrangular pyramid. The surface on the visible surface side may be smooth, may have a curved surface or a convex structure, and may be selectively deformed or destroyed. What is necessary is just to select suitably in order to obtain a required gradation. In addition, the convex structure has a cylindrical shape, a conical shape, a polygonal pyramid shape such as a triangle, five-stroke or six-stroke weight, a shape in which a cone is joined to a cylinder, and a shape in which a pyramid is joined to a prism. Strictly speaking, a hemisphere that is not a semi-ellipsoid, such as a hemisphere, a semi-elliptic sphere, a bullet, a bowl, or a semi-rugby ball, may be used. A concave structure such as a cone, a pyramid, or a spindle having a concave structure may be formed, and even if a concave part such as a cylindrical spindle shape or a rectangular tube shape is formed, the same function as the above-described mobile phone And can demonstrate the effect.

  With respect to the thickness of the cell, a visible image can be reproduced at 0.1 to 2.0 μm. The thickness of a plurality of arranged cells may be uniform, or the thickness may be different for each cell. Even when the transfer foil is provided on the authentication medium, it is very difficult to tamper with only the second authentication display portion.

  Regarding the distance between cells, if the distance between adjacent cells is too far, the authentication information cannot be displayed accurately. Therefore, it is preferable that adjacent cells be 300 μm or less. On the other hand, if the distance between the cells is too close, there is a possibility that interference unevenness or a visual defect may occur in the displayed authentication information. It is necessary to adjust appropriately according to the material of the cell.

  In addition, it is necessary to make the diffraction grating appear in order to display the authentication information on the second authentication information display unit. One method is to provide a high refractive index layer in the cell. A diffraction grating can appear by providing a material having a refractive index higher than that of the visible light transmission layer. By using a material that transmits visible light as the material of the high refractive index layer, the image in the lower layer can also be visually confirmed.

  The high refractive index layer is constituted by providing a single layer or a plurality of layers of metal oxide, intermetallic compound, resin material or metal oxide, intermetallic compound or resin material dispersed in resin material. Is done.

  Specifically, the material used for the high refractive index layer is a transparent material having a higher refractive index than the material used for the cell. For example, Sb2S3, Fe2O3, TiO2, CdS, CeO2, ZnS, PbCl2, CdO, Sb2O3, WO3, Inorganic materials such as SiO2, Si2O3, In2O3, PbO, Ta2O3, ZnO, ZrO2, Cd2O3, Al2O3, and Ge can be used. Further, the transparent thin film layer may be formed by superposing a plurality of layers, or may be a multilayer film in which a combination of layers having different refractive indexes, a high refractive index layer and a low refractive index layer are alternately stacked.

  Further, as a method for forming such a high refractive index layer, film forming means such as sputtering and ion plating can be applied in addition to vacuum deposition, and the film thickness is in the range of 10 nm to 1000 nm. Preferably there is. The transparent thin film layer may be one in which a high refractive index powder such as TiO2 is dispersed in a resin or the like and the refractive index difference from the relief forming layer is 0.2 or more. In this case, since a coating film can be formed by a general coating method, it is not limited to the above film thickness.

  In addition, in order to display the personal authentication information on the second authentication information display unit, there is a method of providing a reflective layer as another method for causing the diffraction grating to appear. As the reflective layer, a metal such as Al, Sn, Ni, Co, Cr, Fe, Ag, Au may be formed as a discontinuous thin film.

4 and 5, when the diffraction grating of the second authentication information display unit is caused to appear using a reflective layer or a high refractive index layer, it is preferable that the information below the second authentication information display units 46 and 56 is visible. . Therefore, there is a method in which the metallic gloss layer is made into a half mirror as a method for allowing the diffraction grating of the second authentication information display unit to appear and confirming information of the intermediate layer underneath it. For example, in the case of aluminum, when a layer having a film thickness of about 20 to 40 nm is provided, it has a metallic luster depending on the angle, but the base appears to be transmitted at other angles. You may provide the layer which makes the diffraction grating of a 2nd authentication information display part appear by such a method.

  In addition, instead of the intermediate layers 47 and 57 in FIGS. 4 and 5, or on the base material surface, a printing unit may be provided via a partially left intermediate layer, in which case the second authentication information display unit In addition to making the metallic gloss layer half-mirrored (described above), there is a method of demetalizing as a method of allowing the diffraction grating of 1 to appear and the information in the lower layer to be visually confirmed. By removing the metal of the metallic luster layer in the form of dots or lines, the diffraction grating of the second authentication information display unit can be visually confirmed, and the printing information in the lower layer can also be visually confirmed.

  The diffraction gratings 17, 47, 57, and 67 can be made to appear by the same method for making the diffraction grating of the second authentication display unit appear.

  The present invention relates to an image forming body that prints, prints, or draws information on a booklet such as a passport or a visa, or an authentication medium such as a card, and in particular, an image such as an image of an authentic owner's face or fingerprint The information is configured by arranging a plurality of cells provided with diffraction gratings, and further includes a layer provided with authentication information constituted by colored images and a layer provided with authentication information constituted by diffraction gratings. Arranged between different layers makes it difficult to forge or tamper, and makes it easier for the examiner performing identification to discriminate what is fraudulent, and more accurate authentication can be performed.

1, 2, 3, 4, 5, 6 ... Information authentication medium 11, 21, 31, 41, 51, 61 ... Base material 12, 22, 32, 42, 52, 62 ... Adhesion Layers 13, 23, 33, 43, 53, 63, 47, 57, ... Intermediate layers 14, 24, 34, 44, 54, 64 ... Protective layers 15, 25, 35, 45, 55, 65 First authentication display section 16, 26, 36, 46, 56, 66 ... Second authentication display section 17, 67 ... Diffraction grating layer 131, 132 ... Thermal head 133 ... Colored ink ribbon 134 Diffraction grating ribbon 135 Interlayer transfer film 136 Protective layer transfer films 137, 138 ... Heat roll

Claims (5)

  A first authentication information display unit that displays at least a base material, first authentication information in a colored state, and a second authentication information that is displayed as a set of dots composed of a plurality of cells made of a structure provided with a diffraction grating. 2 having an authentication information display section, an intermediate layer and a protective layer, the first authentication information display section being disposed on one surface of the base material, and the first authentication information display section being disposed. On the base material, an intermediate layer is laminated so as to cover the first authentication information display unit, and the intermediate layer has an opening in a portion where the first authentication information display unit is not disposed, The second authentication information display unit is disposed in the opening of the intermediate layer, and the protective layer is stacked on the surface opposite to the base material side of the intermediate layer and the second authentication information display unit. Authentication information and the second authentication information consist of authentication information that can be recognized as the same object. Information authentication medium characterized. The information authentication medium according to claim 1, wherein the intermediate layer under the second authentication information display part is partially removed. The information authentication medium according to claim 1, wherein the intermediate layer under the second authentication information display unit is removed with an area smaller than that of the second authentication information display unit. The information authentication medium according to any one of claims 1 to 3, wherein a diffraction grating layer is provided on the first authentication information display unit via the intermediate layer. 5. The information authentication medium according to claim 1, wherein each of the intermediate layer and the protective layer has a thickness of 1 μm to 20 μm.