JP5685876B2 - Image forming body, personal authentication medium and manufacturing method thereof - Google Patents

Description

  The present invention relates to an image forming body that prints, prints, and draws a face image and a fingerprint, which are personal identification points, on a booklet such as a passport and a visa sticker or a personal authentication medium such as a card. In particular, it is difficult to forge or tamper with personal identification information such as the face of a legitimate owner of a personal authentication medium or a fingerprint image by combining a diffraction grating or a cell with irregularities in the shape of a diffraction grating. It is intended to make it easier for the examiner who implements

Various information security methods have been proposed for information recording media related to personal authentication such as passports, visa stickers, and cards.
For example, in a passport, a passport currently used must be readable by both visual and optical character identification methods according to the so-called ICAO regulations. Here, ICAO is an abbreviation for “International Civic Aviation Organization”.
Further, according to the ICAO regulations, the materials and security used for the passport are at the discretion of each country.

  For this reason, materials commonly used as security functions include chemical reactants that react with organic solvents, iris pearl chips, fibers (silk or synthetic fibers, visible or invisible, fluorescent or non-fluorescent), holograms, There is a security thread of a film on which micro characters are printed.

As materials other than those described above, there are various inks such as paper with a watermark pattern and the like, fading ink, fluorescent ink, heat-sensitive ink, and optically changing ink (for example, OVI: Optically Variable Inks).
Furthermore, as a printing method, various techniques such as fine line printing, rainbow printing, intaglio printing, and pixel printing are used to simultaneously improve security and aesthetics.
A face photograph as visual confirmation information of a passport has conventionally been a combination of photographs. Recently, however, there is a tendency that the photograph information is digitized and reproduced in a passport.

  Examples of image reproduction methods for passports include sublimation dyes (heat transferable dyes), thermal transfer recording methods using transfer ribbons using resin-type melt types and wax melt types in which pigments are dispersed, or electrophotographic methods. It is being considered.

In addition to the above method, the image reproduction method on the passport includes a recording method using an ink jet printer (see, for example, Patent Document 1), laser printing using a CO2 or YAG (Yttrium Aluminum Garnet) laser and a thermal color former. There is a recording method (see, for example, Patent Document 2). In addition to these methods, there is a laser engraving print recording method (see, for example, Patent Document 3) that prints and records also in the depth direction of the base material using carbon present in the base material. .
In addition, some visa stickers have been devised such as using a cut provided in a certain pattern so that it is difficult to remove the sticker itself even if the sticker itself is peeled off.

  Further, as an image display body containing this kind of personal recognition data, there is one in which an image pattern formed based on the image data is provided on a card substrate such as polyvinyl chloride. In addition to the above image patterns, in addition to the above-mentioned image pattern, the image is represented by using a hologram, a diffraction grating, or an optical thin film using multilayer interference (effects such as color shift can be obtained by optical design). What has what is called an OVD image is known. Here, OVD is an abbreviation for “Optical Variable Device”.

  Since the above-described OVD technology for holograms and diffraction gratings requires advanced manufacturing technology and is difficult to duplicate, it is used for cards such as credit cards, ID cards, and prepaid cards as effective forgery prevention means. I came.

  Furthermore, the above-described technology is often used for packaging materials, books, pamphlets, POP (Point Of Purchase advertising), and the like because of its high decorativeness.

  As means for sticking the above-mentioned OVD image to an article, conventionally, for example, a method of transferring and forming using a transfer foil has been adopted.

  In this type of transfer, a release layer, a relief layer on which a hologram or diffraction grating image pattern is formed, a reflective layer formed by a known thin film forming means, and an adhesive layer are sequentially laminated on a support. The thing of the structure which consists of is known.

  The OVD patterns (holograms and diffraction grating patterns) engraved on these transfer foils can be reproduced in large quantities by the well-known method of copying a fine uneven pattern on a nickel-based press plate and heating and pressing the relief layer. Has been done.

  The reflective layer is formed by forming a transparent substance having a different refractive index by a known thin film forming means such as a vacuum deposition method (hereinafter sometimes referred to as “transparent thin film layer”), thereby producing a transparent hologram. And forming a transparent diffraction grating formed body 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, in general, a relationship of “refractive index of relief layer <refractive index of transparent thin film layer” is established.

  The hologram or diffraction grating structure obtained by the above method is used for various cards such as a credit card, a cash card, a membership card, an employee card, a prepaid card, and a driver's license as a forgery preventing means. . In addition to various cards, various paper certificates such as gift certificates, gift certificates, stock certificates, various forms such as application forms, receipts, and copy slips, and various booklets such as passports, passbooks, and pension books. In addition, it is used by adhering to a part or the whole of a cover such as a book or a notebook or a display application such as a panel.

  In addition, “whole” described in the above description 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 Also included are those stuck with halftone dots.

  Such an OVD transfer foil performs a sufficient function as an anti-counterfeiting effect, but after forming an image such as a facial photograph as in a passport, the OVD transfer layer is thermally transferred onto the formed image. Formed. For this reason, with the development of the counterfeit technology, there is a possibility that the transfer layer is once removed by some technique, the image data or the like is altered, and then the OVD transfer foil is placed again.

  In addition, sublimation transfer methods, heat-melting transfer ribbon methods, electrophotographic methods, and other printers as means for forming image information such as facial photographs are now widely used. Therefore, it is not necessarily difficult to form a new image in the area after the image forming unit is removed.

  In order to solve the above problems, a method of putting a plurality of pieces of information for identifying an individual in addition to a face photograph has been considered.

  As such a method, there is a method of authenticating by putting digital watermark information in a face photo, storing the information in an IC chip in the same medium, and collating the digital watermark information with the information of the IC chip. (For example, refer to Patent Document 4). Also, there is a method of authenticating the feature point of the facial photo information by digitizing it, converting the value into a two-dimensional code, printing it on the same medium, and comparing the two-dimensional code data with the feature point of the facial photo. Yes (see, for example, Patent Document 5).

  As another verification method, a method of putting a plurality of face photographs that can be authenticated by visual information can be considered. For example, in addition to the face photograph provided by the above-described method, there is a method of forming the same face photograph using a fluorescent material (see, for example, Patent Document 6, Patent Document 7, and Patent Document 8). Further, there is a method of forming a facial photograph by converting a pearl pigment into a melt-type thermal transfer ink ribbon (see, for example, Patent Document 9).

  Further, as a method for holographicizing personal information, a direct thermal transfer method using a hologram ribbon is known (see, for example, Patent Document 10).

JP 2002-226740 A JP 49-131142 A JP 2006-123174 A Japanese Patent Laid-Open No. 2001-126046 JP 2004-70532 A JP-A-7-125403 JP 2000-141863 A JP 2002-226740 A Japanese Patent Laid-Open No. 2003-170685 JP 10-049647 A

However, the methods described in Patent Documents 4 and 5 require a dedicated decoder to read a face photograph, an IC chip, or a two-dimensional code. For this reason, there is a problem that authentication cannot be performed by anyone other than the person who owns the reading device and the decoder.
In addition, in the method using a fluorescent material like the methods described in Patent Documents 6 to 8, it is necessary to use an ultraviolet lamp (black light). For this reason, there exists a problem that the scene which can be authenticated is limited.

Moreover, the face photograph with the pearl pigment formed by the method described in Patent Document 9 can be visually confirmed, but the particles of the pearl pigment are large. For this reason, since it is difficult to form a fine image, there is a problem that only auxiliary authentication is possible.
Further, the method described in Patent Document 10 has a problem that sufficient transfer quality cannot be obtained if the smoothness of the transfer surface is low. This is because, for example, the unevenness of the paper surface of the transfer surface is picked up at the time of transfer, and the luminance of the hologram is remarkably reduced, making it difficult to see, making it difficult to determine authenticity visually.
Therefore, in the method described in Patent Document 10, the medium to be transferred is limited to a relatively smooth plastic card or adhesive label, and sufficient quality cannot be obtained with a booklet such as a passport or a visa sticker. There's a problem.

  The present invention has been made in view of the above-described problems of the prior art, and is forged against personal authentication media such as passports, visa stickers, or various cards that require high security. It has preventive performance against tampering or alteration, and has high visibility and easy-to-find performance that can easily find suspected illegal products by observation etc. even if they are fraudulent. An object of the present invention is to provide an image forming body, a personal authentication medium, and a manufacturing method thereof.

Among the present inventions, the invention described in claim 1 is an image forming body including an owner information display unit that displays information relating to the owner as an image on at least one surface of the transparent base material. The owner information display unit includes a plurality of cells formed in a dot shape, and the cells include a first OVD layer that forms an image of information about the owner, and a colored adhesive layer that is stacked on the first OVD layer. When, wherein the first OVD layer is formed from a hologram or a diffraction grating-like fine irregularities, the colored adhesive layer is to have a colored and light transmitting, at least two of the plurality of cells, in which the color of the colored adhesive layer, characterized in Rukoto different from each other.

Next, of the present invention, the invention described in claim 2 is the invention described in claim 1 , wherein at least three of the plurality of cells have different colors of the colored adhesive layer, The colors of the colored adhesive layer provided in at least three cells having different colors are three colors of red, green, and blue, respectively.

Next, of the present invention, the invention described in claim 3 is the invention described in claim 1 , wherein at least three of the plurality of cells have different colors of the colored adhesive layer, The colors of the colored adhesive layer provided in at least three cells having different colors are three colors of cyan, magenta, and yellow, respectively.
Next, among the present inventions, the invention described in claim 4 is the invention described in any one of claims 1 to 3 , and has the same appearance as the image displayed on the owner information display unit. An owner information printing layer on which an image is printed is provided, and the owner information display unit and the owner information printing layer are visible from the same direction.
Next, of the present invention, the invention described in claim 5 is the invention described in claim 4 , wherein the area of the image printed on the owner information print layer is displayed on the owner information display section. It is characterized by being within a range of 0.1 to 30 times the area of the image.

Next, among the present inventions, the invention described in claim 6 is the invention described in any one of claims 1 to 5 , and is related to image information displayed on the owner information display unit. A second OVD layer that forms an image having no appearance, and the second OVD layer is formed of holograms or diffraction grating-like fine irregularities, and the image formed by the second OVD layer is the first OVD layer It is characterized by being visible from the same direction as the image formed by the OVD layer.
Next, among the present inventions, the invention described in claim 7 is a personal authentication medium formed by transferring the image forming body described in any one of claims 1 to 6 to a substrate to be transferred. Then, the first OVD layer and the colored adhesive layer are transferred and formed in this order on at least one surface of the substrate to be transferred.
Next, of the present invention, the invention described in claim 8 is the invention described in claim 7 , wherein a thin line is combined in advance on the surface of the substrate to which the image is to be transferred. It is characterized in that a pattern of fine patterns which is a pattern is printed.

Next, of the present invention, the invention described in claim 9 is the method for manufacturing the personal authentication medium described in claim 7 or 8 , wherein the plurality of cells are thermally transferred to an image-receiving layer having light transmittance. The image forming body formed in this way is formed by thermal transfer onto at least one surface of the substrate to be transferred.

According to the first to third aspects of the present invention, it is possible to provide an image forming body having individual information regarding the owner, which is formed from holograms or diffraction grating-like fine irregularities. In addition to this, it becomes difficult to form an image of individual information by forgery or the like, so that security can be improved. In addition, since the colored adhesive layer can significantly improve the visibility of the individual information as compared with the conventional image formed only from the hologram, the authenticity determination of the personal authentication medium can be made visually. It can be easily performed.

  In addition, for a plurality of cells, the color of the colored adhesive layer may be a single color, or by changing the color of each cell, various variations of information images relating to the owner can be displayed in a visible manner. It becomes possible.

According to the invention described in claim 4 , the owner information printing layer displays the person who owns the image forming body to the examiner who identifies whether or not the person who owns the image forming body is the true owner of the image forming body. The displayed image and the image displayed on the owner information display unit are selected from the personal authentication information of the same person. For this reason, by visually comparing the two images, it is possible to easily confirm the identity, and it is possible to easily detect the suspected fraudulent product and to exhibit easy-to-find performance.

According to the invention described in claim 5 , the area of the image of the owner information print layer described in claim 4 is 0.1 to 30 times the area of the image displayed on the owner information display unit. By setting the area, the area of each image can be changed according to the application. For this reason, according to a use, it becomes possible to authenticate by comparing two images easily.
In addition, since the configuration of the owner information printing layer can be further complicated, the effect of preventing forgery can be improved, and reproduction / falsification can be made more difficult.

Unlike the invention described in claim 5 , the area of the image of the owner information printing layer described in claim 4 is less than 0.1 times the area of the image displayed on the owner information display section. It becomes difficult to compare and authenticate the two images. Further, unlike the invention described in claim 5 , if the area of the image of the owner information printing layer described in claim 4 exceeds 30 times the area of the image displayed on the owner information display section, It becomes difficult to compare and authenticate two images.

According to the invention described in claim 6 , by providing the second OVD layer that constitutes an image having an appearance that is not related to the information of the image displayed on the owner information display section by the hologram or diffraction grating-like fine irregularities. It is possible to further improve the security.

According to the seventh aspect of the present invention, it is possible to provide a personal authentication medium having individual information regarding the owner, which is formed from holograms or diffraction grating-like fine irregularities. Here, since the image, which is individual information regarding the owner, is observed through the colored adhesive layer, the visibility is further improved and the authenticity of the personal authentication medium can be easily determined visually. It becomes.

According to the invention described in claim 8 , a personal authentication medium that is more difficult to counterfeit by printing in advance a fine pattern for preventing counterfeiting on the surface of the substrate to which the image formed body is transferred. Can be provided. This is because the person who intends to counterfeit does not use the intermediate transfer method, which is the process of the present invention, but directly applies the design relating to the owner, which is formed from hologram or diffraction grating-like fine irregularities on the transferred substrate side. This is intended to make it more difficult to perform easy adhesion treatment with a primer or the like when transferring. This is because when the design related to the owner is directly transferred to the transferred substrate side, the effect of the unevenness of the transferred substrate appears remarkably, so processing to eliminate this unevenness before transfer is required, By performing a process of printing a fine pattern for preventing counterfeiting in advance, the appearance of the fine pattern is different from that of the regular product, and it is possible to easily determine that the product is a counterfeit product. .

According to the ninth aspect of the present invention, after the plurality of cells are thermally transferred to the light-receiving image-receiving layer to form an image forming body, the formed image forming body is transferred to a substrate to be transferred. This makes it possible to provide an image displayed on the owner information display section between the image receiving layer and the transferred substrate, and further provides a personal authentication medium that is highly effective in preventing forgery and tampering. It becomes possible.

1 is a cross-sectional view illustrating a schematic configuration of an image forming body in the present invention. It is sectional drawing which shows schematic structure of the personal authentication medium in this invention. FIG. 3 is a view taken along line III in FIG. 2. It is sectional drawing which shows schematic structure of the image forming body in the modification of this invention. It is sectional drawing which shows schematic structure of the personal authentication medium in the modification of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
Hereinafter, the configuration of the image forming body according to the present embodiment and a personal authentication medium including the image forming body will be described.

(Configuration of image forming body)
First, the configuration of the image forming body 1 of the present embodiment will be described with reference to FIG.
FIG. 1 is a cross-sectional view showing a schematic configuration of an image forming body 1 in the present embodiment.
As shown in FIG. 1, the image forming body 1 of the present embodiment includes an owner information display unit 2 including a plurality of cells 16 including a first OVD layer 20 and a colored adhesive layer 24, an image receiving layer 4, A second transparent coating layer 6, a second OVD layer 8, a second release layer 10, a transparent substrate 12, and an owner information printing layer 14 are provided. In FIG. 1, the comparison of the sizes of the image forming body 1 and each member included in the image forming body 1 may not match the actual size.

(Configuration of owner information display unit 2)
The owner information display unit 2 includes a plurality of cells 16 formed in a dot shape, and displays information relating to the owner of the image forming body 1 or the personal authentication medium as a visible image. In the present embodiment, as an example, the direction in which the owner information display unit 2 displays information relating to the owner so as to be visible is the direction indicated by an arrow “III” in FIG. In the present embodiment, as an example, a case will be described in which information displayed as an image is a face photograph of the owner of the image forming body 1 or the personal authentication medium.

  Each cell 16 is formed in a small area compared to the area of the image forming body 1, and the first release layer 18, the first OVD layer 20, the first transparent coating layer 22, and the colored adhesive layer 24 are sequentially laminated. Is formed. In FIG. 1, a state in which the first release layer 18, the first OVD layer 20, the first transparent coating layer 22, and the colored adhesive layer 24 are sequentially laminated from the bottom to the top in the drawing is shown.

  The first release layer 18 is made of, for example, polycarbonate resin, acrylic resin, fluorine acrylic resin, silicone acrylic resin, epoxy acrylate resin, polystyrene resin, cycloolefin polymer, methylstyrene resin, fluorene resin, PET, It is formed using a thermoplastic resin such as polypropylene, polyethylene terephthalate resin, polyacetal resin or the like to which silicone or a fluorine-based additive is added.

In addition, as a material of the 1st peeling layer 18, it peels from the transparent base material 12, such as a fluorine-type acrylic resin and a silicone type acrylic resin other than what added the additive to the thermoplastic resin as mentioned above, for example. You may use what is easy to do.
Moreover, since the 1st peeling layer 18 is transcribe | transferred on the to-be-transferred base material mentioned later with the image receiving layer 4, it is suitable also to have adhesiveness with a to-be-transferred base material. In addition, when the 1st peeling layer 18 does not have adhesiveness with a to-be-transferred base material, for example, the 1st peeling layer 18 is adhere | attached on a to-be-transferred base material separately via the one-layer adhesive ribbon etc., for example. You may let them.

The first OVD layer 20 is formed from fine irregularities in the form of holograms or diffraction gratings, and constitutes an image of information relating to the owner.
The first OVD layer 20 is made of, for example, polycarbonate resin, acrylic resin, fluorine acrylic resin, silicone acrylic resin, epoxy acrylate resin, polystyrene resin, cycloolefin polymer, methylstyrene resin, fluorene resin, Photo-curing resins such as PET and polypropylene, or thermosetting resins such as acrylonitrile styrene copolymer resins, phenol resins, melamine resins, urea resins, alkyd resins, or propylene resins, polyethylene terephthalate resins, polyacetal resins, etc. The thermoplastic resin is used. In addition, all the hardened | cured material of the thermoplastic resin mentioned above has light transmittance, and the refractive index is generally about 1.5.

The first transparent coating layer 22 is formed using a dielectric layer, a dielectric multilayer film, or a high refractive index material having a refractive index different from that of the first OVD layer 20 as a material.
Here, as the high refractive index material, for example, ZnS, TiO ₂ , PbTiO ₂ , ZrO, ZnTe, PbCrO _{4 and the} like having a refractive index of 2.0 or more are preferable. This is because if the difference in refractive index between the first transparent coating layer 22 and the first OVD layer 20 is small, the visual effect of the diffracted light due to the unevenness of the first OVD layer 20 is weakened.
Specifically, the difference in refractive index between the first transparent coating layer 22 and the first OVD layer 20 is preferably at least 0.5 or more. The film thickness of the first transparent coating layer 22 is preferably in the range of 50 to 100 [nm].

The colored adhesive layer 24 is colored and has optical transparency.
Specifically, the colored adhesive layer 24 is formed using a thermoplastic resin or the like colored by adding a pigment.
Here, as the pigment forming the colored adhesive layer 24, for example, natural dyes obtained from Akane, turmeric, safflower, etc., synthetic dyes such as Mauve, Indigo, Alizarin, etc. can be used.

Moreover, as a pigment | dye which forms the colored contact bonding layer 24, you may use pigments, such as a metal-type phthalocyanine compound and an azo compound, for example besides the synthetic dye mentioned above. However, it is necessary to determine the type and the amount of addition of any pigment so that the transparency is not lost and the adhesiveness and foil sharpness can be maintained.
In the image receiving layer 4, a plurality of cells 16 included in the owner information display unit 2 are bonded to a surface (a lower surface in FIG. 1) facing a transfer substrate described later by a colored adhesive layer 24. As seen from the thickness direction of the image forming body (in FIG. 1, the direction orthogonal to the paper surface), the plurality of cells 16 are included.

The image receiving layer 4 is formed using, for example, a thermoplastic resin such as propylene resin, polyethylene terephthalate resin, polyacetal resin, or polyester resin. The material of the image receiving layer 4 is not particularly limited as long as it is a material of the second transparent coating layer 6, an adhesive force with other resins, and a printing property.
Here, the above-mentioned resin is used for writing information relating to so-called personal authentication such as character information such as a face photograph, name, date of birth, etc. using a color ribbon. It is preferable to have a function as an adhesive that closely adheres when thermally transferred upward.

Although the film thickness of the image receiving layer 4 is not specifically limited, For example, it is preferable in the range of 5.0-10.0 [micrometers].
The second transparent coating layer 6 is laminated on the surface of the image receiving layer 4 opposite to the surface to which the plurality of cells 16 are bonded (upper surface in FIG. 1).
The second transparent coating layer 6 is made of a dielectric layer, a dielectric multilayer film, or a high refractive index material having a refractive index different from that of the second OVD layer 8 as the material, similar to the first transparent coating layer 22 described above. It is formed using. As in the relationship between the first transparent coating layer 22 and the first OVD layer 20 described above, if the refractive index difference between the second transparent coating layer 6 and the second OVD layer 8 is small, the second OVD layer 8 This is because the visual effect of the diffracted light due to the unevenness is weakened.

  Specifically, the refractive index difference between the second OVD layer 8 and the second transparent coating layer 6 is at least 0.5 or more, similar to the refractive index difference between the first transparent coating layer 22 and the first OVD layer 20. Good to have. The film thickness of the second transparent coating layer 6 is preferably in the range of 50 to 100 [nm], like the first transparent coating layer 22.

The second OVD layer 8 is laminated on the surface of the second transparent coating layer 6 opposite to the surface facing the image receiving layer 4 (upper surface in FIG. 1).
Further, the second OVD layer 8 is formed of holograms or diffraction grating-like fine irregularities, and has an external appearance image that is not related to the image information displayed on the owner information display unit 2, that is, a photograph of the owner's face. The image of the appearance which is not related to is composed.

Further, the second OVD layer 8 is formed so that the constructed image can be viewed from the same direction as the image constructed by the first OVD layer 20 (the direction indicated by the arrow “III” in FIG. 1). ing.
The second OVD layer 8 is formed using the same material as that of the first OVD layer 20 described above.
The second release layer 10 is laminated on the surface of the second OVD layer 8 opposite to the surface facing the second transparent coating layer 6 (the upper surface in FIG. 1).
Moreover, the 2nd peeling layer 10 is formed using the material similar to the 1st peeling layer 18 mentioned above as a material.
The second release layer 10 is formed so as to be heavier than the first release layer 18. This is because when the weight of the second release layer 10 is equal to or less than the weight of the first release layer 18, the second release layer 10 is peeled off when the transparent substrate 12 is released from the second release layer 10, as will be described later. This is because the layer 10 causes the cells 16 and the like to be peeled off from a transfer substrate to be described later.

The transparent substrate 12 is a transparent sheet, and is laminated on the surface of the second release layer 10 opposite to the surface facing the second OVD layer 8 (the upper surface in FIG. 1). ing.
The transparent substrate 12 is formed using, for example, a plastic sheet such as polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), or the like. ing.
Moreover, although the suitable value changes with the uses after formation, the thickness of the transparent base material 12 is preferably in the range of 10 to 100 [μm].
The owner information printing layer 14 is printed on the same surface (the lower surface in FIG. 1) as the surface to which the plurality of cells 16 are bonded, and is an image displayed on the owner information display unit 2, that is, This is a printed layer of an image with the same appearance as the owner's face photo.

Here, in this embodiment, the configuration of the owner information printing layer 14 is added to the image of the same appearance as the owner's face photo, and the owner's name, birthplace, date of birth, etc. A case where character information indicated by characters is printed will be described as an example.
Of the images printed on the owner information print layer 14, the area of the image having the same appearance as the face photograph of the owner is 0.1 to 30 with respect to the area of the image displayed on the owner information display unit 2. It is set within the double range.
This is due to the reason described below.

  For example, if the image printed on the owner information printing layer 14 has the same appearance as the owner's face photo (hereinafter referred to as “printed face photo image”) is a color face photo, The resolution of a photographic image is generally expressed by a halftone dot of 175 [lines / inch]. This is because, in general, even if the resolution is smaller than a halftone dot of 175 [lines / inch], it cannot be distinguished visually.

  On the other hand, the plurality of cells 16 constituting the image displayed on the owner information display unit 2 (hereinafter referred to as “displayed face photo image”) have a minimum 5 [μm] circle or square size. is necessary. When the face photo of the owner is formed by the minimum size cell 16, the display face photo image having a size of 1/30 of the size of the printed face photo image having a resolution of 175 [lines / inch]. Is obtained.

In the case of a display face photographic image having a size of 1/30, the display face photographic image cannot be compared with a printed face photographic image unless viewed with a magnifying glass or the like. In this case, the size of the cell 16 necessary for constructing the printed face photographic image becomes too small, and a sufficient function as a diffraction grating cannot be obtained.
Further, even if the cell 16 having the minimum size (5 [μm]) functioning as a diffraction grating is used, an image having the same number of pixels as the printed face photo image cannot be expressed. Image comparison with is difficult.

On the other hand, if the displayed face photo image exceeds 10 times the size of the printed face photo image, the personal authentication information that is the owner's information cannot be accurately reproduced because it is too large. Image comparison between the image and the displayed face photograph image becomes difficult.
Therefore, the ratio of the printed face photo image and the display face photo image is preferably in the range of 0.1: 1 to 30: 1. This is because, as described above, if there is a ratio difference outside the range, it becomes difficult to compare the printed face photograph image and the display face photograph image, and the accuracy of personal identification is reduced. Note that the size of the printed face photo image and the displayed face photo image may be enlarged or reduced at the same vertical and horizontal ratios.

(Configuration of personal authentication medium)
Next, the configuration of the personal authentication medium 26 of this embodiment will be described with reference to FIG. 1 and FIG. 2 and FIG.
FIG. 2 is a cross-sectional view showing a schematic configuration of the personal authentication medium 26 in the present embodiment. FIG. 3 is a view taken along the line III in FIG. Here, an arrow III shown in FIG. 2 is a direction in which the owner information display unit 2 displays information relating to the owner so as to be visible, like the arrow III shown in FIG.

As shown in FIG. 2, the personal authentication medium 26 includes the image forming body 1 having the above-described configuration and a transfer base material 28.
The transferred substrate 28 is formed using paper or resin (plastic) formed into a card shape.
Further, a fine pattern (not shown), which is a combination of thin lines, is printed in advance on the surface (the upper surface shown in FIG. 2) of the substrate to be transferred 28 facing the image forming body 1. ing.
In FIG. 3, an image formed by the first OVD layer 20, that is, an image of the owner's face photograph is shown with reference numeral 20 a. Similarly, in FIG. 3, an image formed by the second OVD layer 8, that is, an image having an appearance that is not related to the owner's face photograph, is denoted by reference numeral 8 a.

In addition, in FIG. 3, an image printed on the owner information printing layer 14, that is, an image having the same appearance as the face photograph of the owner is shown with reference numeral 14 a, and character information about the owner Is shown with reference numeral 14b.
Here, the image 20a formed by the first OVD layer 20 corresponds to the display face photographic image described above. Similarly, the image 14a having the same appearance as the owner's face photo printed on the owner information printing layer 14 corresponds to the above-described printed face photo image.

(Formation method of image forming body 1)
Hereinafter, a method for forming the image forming body 1 in the present embodiment will be described with reference to FIGS. 1 to 3.
In the image forming body 1, an image displayed on the image receiving layer 4 so that the owner information display unit 2 is visible is thermally transferred onto the image receiving layer 4 by a hologram ribbon (hologram transfer ribbon) (not shown) provided with the colored adhesive layer 24. Is.

Here, the configuration of the hologram ribbon will be described.
The hologram ribbon is a member that expresses a colored hologram by transferring the colored hologram in a cell shape to a target location. In the present embodiment, the colored expression of the hologram is performed by the colored adhesive layer 24 that is colored and has optical transparency.
The hologram ribbon has a function of peeling from a ribbon substrate (not shown) in contact with the first release layer 18 after being bonded onto the image receiving layer 4 by thermal transfer. Here, the image of the hologram ribbon transferred onto the image receiving layer 4 is observed from the arrow III side through the colored adhesive layer 24, so that it is easy to make a colored expression, and unlike the expression using only the conventional diffracted light, the visibility is high. Even better.

Here, the image forming body 1 to which the hologram ribbon has been transferred is further thermally transferred onto the substrate 28 to be transferred. That is, the image forming body 1 of the present embodiment is a transfer body to which a hologram ribbon or an ink ribbon is transferred, and at the same time, a transfer body to which the image forming body 1 itself is transferred to the transfer substrate 28.
For this reason, the function required for the hologram includes heat resistance that can sufficiently withstand not only the heat at the time of transfer onto the image forming body 1 but also the heat at the time of transfer onto the transfer substrate 28.
Further, in order to express a smooth and high-definition image by the hologram ribbon, it must be thermally transferred with very fine dots, and therefore, when the first release layer 18 is peeled from the substrate, a good foil Sharpness is required.

(Method of forming a colored hologram)
Hereinafter, a method for forming a colored (full color) hologram by thermal transfer of the above-described hologram ribbon will be described.
For example, full-color image data of general three primary colors RGB (red, green, blue) as displayed on a monitor of a personal computer (PC) is input on a computer program. Then, the input data is output to a program of a thermal transfer device such as a thermal head, and each of the colored adhesive layers is prepared using a hologram ribbon provided with three kinds of RGB colored adhesive layers 24 (three colors) prepared in advance. When the image is transferred to the target position 24, it is possible to form a full-color hologram as if the photograph was emitted as it was by the diffracted light of the RGB colors and the hologram.

Further, a hologram diffraction grating pattern designed to emit RGB diffracted lights at specific angles, respectively, and three types of RGB (three colors) on each hologram pattern is used. By providing each of the colored adhesive layers 24, a clearer full-color hologram can be formed.
The dot size of the cell 16 at the time of transferring the hologram ribbon described above is not particularly limited, but the length of one side of the dot is in the range of 0.042 to 0.508 [mm] (600 to 50 [dpi] is preferred.

  However, when the patterned hologram pattern is used as a face photograph of an individual subject, the length of one side of the dot is in the range of 0.042 to 0.169 [mm] (600 to 150 [dpi]). (Within the range). This is because, as the dot size increases, the expressiveness of the hologram design decreases, and conversely, when the dot size decreases, the influence of variations during transfer increases.

(Method for manufacturing personal authentication medium 26)
Hereinafter, a method for manufacturing the personal authentication medium 26 in the present embodiment will be described with reference to FIGS.
The personal authentication medium 26 is formed by transferring the image forming body 1 having the above-described configuration onto the transfer target substrate 28 and then peeling the transparent substrate 12 from the second release layer 10. Here, the personal authentication medium 26 is transferred onto the surface (the upper surface shown in FIG. 2) of the substrate 28 to which the image forming body 1 is transferred, in the order of the first OVD layer 20 and the colored adhesive layer 24. Is formed. When forming the personal authentication medium 26, other media and processes may be included as necessary.
That is, the personal authentication medium 26 is formed by thermally transferring the image forming body 1 formed by thermally transferring the plurality of cells 16 to the light-receiving image receiving layer 4 onto at least one surface of the substrate 28 to be transferred. ing.

(effect)
In the case of the image forming body 1 and the personal authentication medium 26 according to the present embodiment, individual information such as a printed face photographic image printed on the image receiving layer 4 with an ink ribbon and the same individual information formed by thermal transfer of the hologram ribbon are formed. It is possible to easily determine the authenticity by visually comparing two images of the face photograph image.
In addition to this, the display face photographic image, which is the key to improving security, is located in the middle of each layer forming the image forming body 1, so that it is very difficult to falsify.
Further, since the second OVD layer 8 is provided in the image forming body 1, it is possible to further improve the security.
In addition, when only the conventional hologram ribbon is used, when heat transfer is performed to the transfer target substrate 28 such as a paper surface, the unevenness such as the paper surface is picked up, and the diffracted light is scattered. However, with the image forming body 1 and the personal authentication medium 26 of the present embodiment, the diffracted light can be observed through the colored adhesive layer 24, so that the visibility can be greatly improved. It becomes.

(Example)
With reference to FIG. 1 to FIG. 3, a sample having the same configuration as the image forming body 1 and the personal authentication medium 26 described in the first embodiment described above (hereinafter referred to as “sample of the present invention”). The results of manufacturing and evaluating the physical properties will be described.
When the sample of the example of the present invention was manufactured, first, the image forming body 1 was formed.
First, a polyethylene terephthalate film having a thickness of 25 [μm] was used as a transparent substrate, and a film was formed by printing with a gravure coater in the order of the second release layer 10 and the second OVD layer 8. And after making it dry using oven, the film thickness of the 2nd peeling layer 10 was 0.6 [micrometer], and the film thickness of the 2nd OVD layer 8 was formed as 0.7 [micrometer].

Next, the fixed pattern hologram was formed in the 2nd OVD layer 8 by heat-pressing the film formed as mentioned above with a roll embossing apparatus using the fixed pattern hologram plate.
And the 2nd transparent membrane | film | coat layer 6 was provided by performing ZnS vapor deposition on the 2nd OVD layer 8. FIG. Here, the film thickness of the second transparent coating layer 6 was 80 [nm].
The image receiving layer 4 was printed on the second transparent coating layer 6 using a gravure coater. Here, the film thickness of the image receiving layer 4 was 0.6 [μm].

Next, a hologram ribbon was created. A polyethylene terephthalate film having a thickness of 12 [μm] was used as a substrate in contact with the first release layer 18, and printing was performed with a gravure coater in the order of the first release layer 18 and the first OVD layer 20. And after making it dry using oven, the film thickness of the 1st peeling layer 18 was set to 0.6 [micrometer], and the film thickness of the 1st OVD layer 20 was formed to 0.7 [micrometer].
Next, the film formed as described above was hot-pressed with a roll embossing device using a plate formed of a diffraction grating hologram having a spatial frequency of 1000 [lines / mm] to form a solid pattern hologram.
Furthermore, the first transparent coating layer 22 was provided by performing ZnS vapor deposition on the first OVD layer 20. Here, the film thickness of the first transparent coating layer 22 was set to 80 [nm].

And the colored adhesive layer 24 colored in each color of R, G, B was printed on the film formed as described above by a gravure coater. Here, the film thickness of the colored adhesive layer 24 was 0.6 [μm], respectively.
In addition, the colored adhesive layer 24 contains “VALIFAST RED”, “VALIFAST GREEN”, and “VALIFAST BLUE” (all manufactured by Orient Chemical Industry Co., Ltd.) as dyes, with respect to 100 parts of the main component solid content of the colored adhesive layer 24. A colored adhesive layer 24 having a color and light transmittance was formed by adding portions and coloring with R, G, and B colors.

After forming the colored adhesive layer 24, the above-mentioned film is slit into a transfer ribbon size width and divided into R, G, B, R, G, B so as to repeat, and the hologram ribbon is formed. Created.
Then, after creating the hologram ribbon, the hologram ribbon was transferred to a target position on the image receiving layer 4 by using a thermal head to form a full-color hologram face image.
In addition, when forming an image of the owner's face photograph, a face photograph of the person who is the subject is taken in advance and converted into image data made up of three primary color RGB dot-like cells, which is then displayed on the computer program. Was input. The input data was output to the program of the thermal head thermal transfer device, and the RGB portion of the hologram ribbon was transferred to each location in the form of dots to form a face photograph image. The resolution at this time was 300 [dpi] (the length of one side of one dot was 0.084 [mm]).

Next, known yellow, magenta, cyan, and black ink ribbons were prepared, and similarly, a face photograph and character information were printed on the image receiving layer 4 of the image forming body 1 to obtain an image forming body 1. Then, after the image forming body 1 and the transfer target substrate 28 were bonded, the transparent base material 12 was peeled off to transfer the image forming body 1 to obtain a sample of the present invention example.
Next, two types of samples (hereinafter referred to as “samples of comparative example A and comparative example B”) were manufactured as comparative controls for the samples of the present invention.

In the sample of Comparative Example A, a hologram ribbon made of a single type of diffraction grating hologram having a spatial frequency of 1000 [lines / mm] was used instead of the colored adhesive layer 24 in the sample of the present invention.
Then, a photograph of the face of the person who is the subject is taken in advance and converted into monochrome data, and a face image of 300 [dpi] is formed by thermal head thermal transfer of the hologram ribbon in the same manner as described above. Obtained.

  On the other hand, the sample of Comparative Example B uses a conventional transparent material instead of the colored adhesive layer 24 in the sample of the present invention, and has a spatial frequency of 1140 [mm] (designed to produce R diffracted light) and a spatial frequency of 1310 [ mm] (design that emits diffracted light of G) and spatial frequency 1540 [mm] (design that emits diffracted light of B), respectively.

Then, in the same manner as described above, it was converted to image data composed of dot cells of the three primary colors RGB, and a 300 [dpi] face image was formed by thermal head thermal transfer of a hologram ribbon, and a sample of Comparative Example B was obtained.
As a result of visual judgment on the three types of samples (the sample of the present invention, the sample of comparative example A, and the sample of comparative example B) obtained through the above procedure, the sample of comparative example A and the comparison In both the samples of Example B, since the brightness of the diffracted light was low and the visibility was poor, it was very difficult to determine authenticity compared to a face photograph.

On the other hand, it was confirmed that the sample of the example of the present invention was improved in visibility depending on the color of the colored adhesive layer 24, and it was easy to determine authenticity compared with a face photograph.
Therefore, in the personal authentication medium 26 of the present embodiment configured as described above, the portion in which information relating to the owner is displayed as an image is visibly visible compared to the conventional one. confirmed.

  It was also found that authenticity can be easily determined by comparing face photographs with individual information holograms. For this reason, it is possible to provide the image forming body 1 and the personal authentication medium 26 having high security that can be easily determined by visual inspection when counterfeit or tampered products are available. confirmed.

(Application examples)
Hereinafter, application examples of the first embodiment will be listed.
(1) In the first embodiment, the configuration of the image forming body 1 is configured to include the second transparent coating layer 6 and the second OVD layer 8, but is not limited thereto. That is, for example, as shown in FIGS. 4 and 5, the configuration of the image forming body 1 may be a configuration that does not include the second transparent coating layer 6 and the second OVD layer 8. FIG. 4 is a cross-sectional view showing a schematic configuration of the image forming body 1 in a modification of the first embodiment of the present invention. FIG. 5 is a cross-sectional view showing a schematic configuration of the personal authentication medium 26 in a modification of the first embodiment of the present invention.

(2) In the first embodiment, among the image forming body 1, except for the owner information display unit 2, the second OVD layer 8, and the owner information print layer 14, the transparent layer is used. It is not limited. That is, in the image forming body 1, portions other than the owner information display unit 2, the second OVD layer 8, and the owner information print layer 14 may be colored in a visible range.
Further, for example, an opaque reflective layer expressed by any one of dot, line, figure, or combination may be provided on a part of the image receiving layer 4. In this case, the hologram design having the individual information displayed below it and the printed striped pattern are concealed.

  The reason why the image forming body 1 is formed of a transparent layer other than the owner information display unit 2, the second OVD layer 8, and the owner information printing layer 14 is that the image forming body 1 is to be transferred. After being transferred to the base material 28, it is located on the outermost surface of the personal authentication medium 26, so that it is transparent to increase the visibility of the hologram image in which individual information is patterned and the printed fine pattern. This is desirable.

DESCRIPTION OF SYMBOLS 1 Image forming body 2 Owner information display part 4 Image receiving layer 6 2nd transparent film layer 8 2nd OVD layer 10 2nd peeling layer 12 Transparent base material 14 Owner information printing layer 16 cell 18 1st peeling layer 20 1st OVD Layer 22 First transparent coating layer 24 Colored adhesive layer 26 Personal authentication medium 28 Transferred substrate

Claims (9)

An image forming body including an owner information display unit that displays information relating to the owner as an image on at least one surface of the transparent substrate,
The owner information display unit includes a plurality of cells formed in a dot shape,
The cell includes a first OVD layer constituting an image of information about the owner, and a colored adhesive layer laminated on the first OVD layer,
The first OVD layer is formed from fine irregularities in the form of holograms or diffraction gratings,
The colored adhesive layer is to have a colored and light transmitting,
At least two, the image forming body color of the colored adhesive layer, characterized in Rukoto different from each other among the plurality of cells. At least three of the plurality of cells have different colors of the colored adhesive layer,
2. The image forming body according to claim 1 , wherein colors of the colored adhesive layer provided in at least three cells having different colors are three colors of red, green, and blue, respectively. At least three of the plurality of cells have different colors of the colored adhesive layer,
2. The image forming body according to claim 1 , wherein colors of the colored adhesive layer provided in at least three cells having different colors are three colors of cyan, magenta, and yellow, respectively. An owner information printing layer on which an image having the same appearance as the image displayed on the owner information display unit is printed;
The image forming body according to any one of claims 1 to 3 , wherein the owner information display unit and the owner information printing layer are visible from the same direction. Area of the image printed on the owner information printed layer, according to claim 4, characterized in that in the range of 0.1 to 30 times the area of the image displayed on the owner information display unit Image forming body. A second OVD layer that constitutes an image having an appearance that is not related to the image information displayed on the owner information display unit;
The second OVD layer is formed of holograms or diffraction grating-like fine irregularities,
Image said second OVD layer is constructed, the image formation as described in any one of claims 1 to 5, characterized in that said first OVD layer is visible from the images and the same direction which is constituted body. A personal authentication medium formed by transferring the image forming body according to any one of claims 1 to 6 to a substrate to be transferred,
A personal authentication medium formed by transferring the first OVD layer and the colored adhesive layer in this order on at least one surface of the substrate to be transferred. 8. The personal authentication medium according to claim 7 , wherein a pattern of a fine pattern, which is a combination of thin lines, is printed in advance on a surface of the substrate to which the image is to be transferred. A method of manufacturing a personal authentication medium according to claim 7 or 8 ,
Manufacture of a personal authentication medium, wherein the image forming body formed by thermally transferring the plurality of cells to a light-transmitting image-receiving layer is thermally transferred to at least one surface of the substrate to be transferred. Method.

Images