JP5569106B2 - Image display medium and image forming method - Google Patents

Description

  The present invention forms, for example, an image display medium for printing, printing, and drawing a face image or a fingerprint, which is a personal identification key, on a booklet such as a passport or a visa, or a personal authentication medium such as a card, and the image display medium In particular, by combining image information such as the image of the legitimate owner's face and fingerprint, and personal information such as the person's first and last name and date of birth, by combining a diffraction grating and a receiver The present invention relates to an image display medium and an image forming method for making counterfeiting difficult.

  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 that is currently used must be readable by both visual and optical character identification methods according to the provisions of so-called ICAO (International Civic Aviation Organization).

  According to ICAO regulations, the materials and security used in passports are at the discretion of each country. The security functions commonly used are chemical reactants that react with organic solvents, iris pearl chips, Fiber (silk or synthetic fiber, visible or invisible, fluorescent or non-fluorescent), security thread for films printed with holograms or micro characters, paper with a watermark pattern, fading ink, fluorescent ink, thermal ink, optical Incorporates various techniques such as various inks (such as so-called OVI), fine line printing, rainbow printing, intaglio printing, pixel printing, etc. to improve security and aesthetics at the same time.

  In addition, a face photograph as visual confirmation information of a passport has conventionally been a combination of photographs, but recently, there is a tendency to digitize the photograph information and reproduce it 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 melting types and wax-melting types in which pigments are dispersed, or electrophotography. It is being considered.

  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, see Patent Document 2). Further, there is a laser engraving print recording method (see, for example, Patent Document 3) in which carbon (C) present in the base material is used for printing and recording in the depth direction of the base material.

  Some visa stickers have been devised such as using ones with cuts in a certain pattern so that it is difficult to remove the stickers themselves even if they are peeled off.

  Further, as an image display body containing this kind of personal recognition information, an image pattern formed based on the image information is provided on a card substrate such as polyvinyl chloride, or in addition to the image pattern. Those having a so-called OVD (Optical Variable Device) image represented by an image obtained 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) Are known.

  The OVD technology for holograms and diffraction gratings requires advanced manufacturing technology and is difficult to duplicate, so it has 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 OVD to an article, 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 well-known thin film forming means, and an adhesive layer. Things are known.

  The OVD pattern (hologram and diffraction grating pattern) engraved on the transfer foil is mass-replicated by a well-known method in which a minute uneven pattern is copied on a nickel press plate and heated and pressed on a relief layer.

In addition, the reflective layer can form a transparent hologram or a transparent diffraction grating by forming a transparent substance having a different refractive index (hereinafter referred to as a transparent thin film layer) by a known thin film forming means such as a vacuum deposition method. Is a known technique. In this case, it is clear from an optical point of view that the greater the refractive index difference between the relief layer and the transparent thin film layer, the greater the reflectance. Where
(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 card cards, employee ID cards, prepaid cards, driver's licenses and other cards, gift certificates, and gift certificates. 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.

  Although the OVD transfer foil performs a sufficient function as an anti-counterfeit effect, the OVD transfer layer 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, there is a possibility that the transfer layer is once removed by some technique, and the image information and the like are tampered with and then the OVD transfer foil is put on again.

  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 not necessarily 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 in addition to a face photograph has been considered. There is a method for 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 information on the IC chip (for example, Patent Document 4). reference).

  Also, the feature points of the facial photo information are digitized, and the values are converted into a two-dimensional code and printed on the same medium. There is a method of authenticating by collating the data of the two-dimensional code and the feature point of the face photograph (for example, see Patent Document 5).

  However, the above-described method requires a dedicated decoder for reading a facial photograph, an IC chip, and a two-dimensional code, and there is a problem that only a person who owns the reading device and the decoder can authenticate.

  As another verification method, a method of putting a plurality of face photographs that can be authenticated by visual information can be considered. In addition to the face photograph provided by the above method, there is a method of forming the same face photograph using a fluorescent material (see, for example, Patent Documents 6, 7, and 8). There is also 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).

  However, in the method using the fluorescent material, since it is necessary to use an ultraviolet lamp (black light), the scenes that can be authenticated are limited. On the other hand, a face photograph with a pearl pigment can be confirmed by visual observation, but since the particles of the pearl pigment are large, it is difficult to form a fine image, and there is a problem that only a supplementary authentication is possible.

  Further, a direct thermal transfer method using a hologram ribbon (for example, see Patent Document 10) is known as a method for holographicizing personal information, but an image formed by this method is flat and high. There is a problem that the effect of preventing forgery cannot be obtained.

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

  The present invention has been made in view of the above circumstances, and is an anti-counterfeiting, falsification or alteration prevention performance for image display media that require high security, and in the event that such fraud is made. An object of the present invention is to provide an image display medium and an image forming method capable of realizing easy-to-find performance that can be easily found by observing a suspected fraudulent product.

The image display medium according to claim 1 of the present invention, the observation color in a particular viewing zone R (red), and 3 types of hologram ribbons the three primary colors of G (green), B (blue), Y (yellow ) , M (magenta) , and C (cyan) ink ribbons, and an image display medium on which an information pattern is formed by sequentially transferring the dots as small area dots. One of R or C is transferred to the first region, one of G or M is transferred to the second region, and one of B or Y is transferred to the third region. Either one of them is transferred.

The image display medium according to claim 2 of the present invention is characterized in that the reflection layer of the hologram ribbon is a transparent reflection layer.

The image display medium according to claim 3 of the present invention is characterized in that the reflection layer of the hologram ribbon is a metal thin film layer.

The image display medium according to claim 4 of the present invention is characterized in that the information pattern is a photograph of the face of the owner or user of the image display medium.

The image forming method according to claim 5 of the present invention uses three types of hologram ribbons in which the observation colors in a specific viewing zone are the three primary colors R, G, and B, and ink ribbons of Y, M, and C. An image forming method for forming an information pattern by sequentially transferring dots as minute areas, wherein when the information pattern is formed, the transfer region is divided into three, and the first region is either R or C. One is transferred, one of G and M is transferred to the second region, and one of B and Y is transferred to the third region.

The image forming method according to claim 6 of the present invention is characterized in that the hologram ribbon and the ink ribbon are provided on the same substrate, and all the ribbons are transferred by the same thermal head.

The image forming method according to claim 7 of the present invention is characterized in that at least one of the transfer of the hologram ribbon and the transfer of the ink ribbon is performed on the intermediate transfer foil and then transferred to the substrate.

According to the image display medium of the first aspect of the present invention, the information pattern can be observed as a hologram image having color information in a specific viewing area, and the information pattern is ink in a viewing area where the diffracted light of the hologram cannot be observed. The dots formed by the transfer of the ink ribbon can be observed as a printed image expressed by the ribbon, and the first region where either R or C is transferred and either G or M is transferred The hologram image and the printed image have substantially the same content by comprising three transfer regions of the second region and the third region to which either B or Y is transferred, and Can be observed at the same position.

  Further, in visual observation, it is possible to obtain a special visual effect by a hologram having color information in a specific viewing area, and to clearly indicate that an information pattern exists in that place in a viewing area without the hologram effect. be able to. Furthermore, when the information pattern is enlarged and observed with a microscope or the like, the dots transferred by the six types of ribbons R, G, B, Y, M, and C are expressed without overlapping and missing. Therefore, it is possible to make forgery / alteration difficult, and to easily identify forgery / alteration products.

According to the image display medium according to claim 2 of the present invention, the reflective layer used for the hologram ribbon is a transparent thin film layer, so that even if the hologram ribbon is transferred, it is printed on the transfer medium in advance. The printed information becomes visible.

According to the image display medium of claim 3 of the present invention, the reflection layer and the diffracted light of the hologram image can be increased and the visual effect can be improved by making the reflection layer used for the hologram ribbon an opaque metal thin film layer. .

According to the image display medium according to the fourth aspect of the present invention, the information pattern to be formed is a face photograph of the owner or user of the image display medium, so that the identity verification is facilitated.

According to the image forming method of the fifth aspect of the present invention, the dots formed by ribbon transfer are the first region where either R or C is transferred and the first region where either G or M is transferred. By forming three transfer areas, the second area and the third area to transfer either B or Y, the contents of the hologram image and the print image are substantially the same and formed at the same position. it can.

According to the image forming method according to claim 6 of the present invention, it provided a hologram ribbon and the ink ribbon on the same substrate, by performing the thermal transfer in a single thermal head, high image formation of the transfer position accuracy of the dots Is possible.

According to the image forming method according to claim 7 of the present invention, by at least one hologram ribbon and the ink ribbon to an intermediate transfer system, thereby enabling more transfer quality high image formation. Since the intermediate transfer method is not affected by the level difference of the substrate to be transferred finally, high-quality transfer is possible, and the intermediate foil is overlayed to protect the transferred dots. It becomes possible to have forgery prevention properties.

The schematic diagram which shows the observation method of the image display medium which transcribe | transferred and formed the hologram image. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view schematically showing a configuration of a hologram ribbon according to a first embodiment of the present invention. 1 is a plan view schematically showing a configuration of an image display medium according to a first embodiment of the present invention. The top view which shows typically the structure of the image display medium which concerns on the 2nd Example of this invention. AA arrow sectional drawing in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The image display medium of the present invention includes a process for transferring a hologram ribbon and an ink ribbon to a substrate or an intermediate foil, and a process for transferring the intermediate foil onto a substrate when the ribbon is transferred onto the intermediate foil. And may have other media and processes as needed.

First, the hologram ribbon used in the present invention will be described.
The hologram ribbon used in the present invention is a transfer foil having a hologram image, and comprises at least a back coat layer, a support, a release layer, a hologram forming layer, a reflective layer, and an adhesive layer. The hologram ribbon has a function of peeling from a support after being bonded onto a base material or intermediate foil by thermal transfer. Since the hologram ribbon transferred onto the intermediate foil is then further thermally transferred onto the substrate, the functions required of the hologram ribbon include not only the heat during transfer onto the intermediate foil but also the transfer during transfer onto the substrate. Heat resistance that can withstand heat sufficiently is mentioned.
Further, since the hologram ribbon is transferred with minute dots to express the pattern of individual information, it is required to have a good foil cutting property when peeling from the support.

  The dot size at the time of transferring the hologram ribbon in the present invention is not particularly limited, but the length of one side of the dot is preferably between 0.042 mm and 0.508 mm (between 600 dpi and 50 dpi). In the case where the hologram pattern is used as a subject's individual face photograph, the length of one side of the dot is preferably between 0.042 mm and 0.169 mm (between 600 dpi and 150 dpi). This is because as the dot size increases, the expressiveness of the information pattern decreases, and conversely, when the dot size decreases, the influence of variations during transfer increases.

  The hologram ribbon is provided with a reflective layer in order to give the hologram image reflectivity and increase the hologram effect. As the reflective layer, a transparent thin film layer having reflective transparency or an opaque metal thin film layer can be used.

Examples of the material of the transparent thin film layer include a continuous thin film of a material having a refractive index different from that of the hologram forming layer, a metal thin film having a thickness of less than 200 mm, and examples include zinc sulfide and titanium dioxide. It is not limited to this.
The material of the metal thin film layer is a simple substance selected from chromium, nickel, aluminum, iron, titanium, silver, gold, and copper, or a mixture or alloy thereof.

The pattern of the hologram ribbon used in the present invention needs to have spatial frequencies corresponding to the R (red), G (green), and B (blue) ribbons, which are the three primary colors. The spatial frequency of the hologram pattern is determined according to the required color wavelength, the angle of the irradiation light, and the viewing zone. For example, hologram patterns having the following spatial frequencies are formed in the R hologram area, the G hologram area, and the B hologram area, respectively.
R hologram area ... 1140 (line / mm)
G hologram area: 1310 (line / mm)
B hologram area ... 1540 (line / mm)
Next, an observation method of the image display medium will be described with reference to FIG. As the observation method, for example, the white irradiation light 100 is irradiated from the zenith direction 45 degrees on the surface of the image display medium 1, and observation is performed at an observation point 101 that is a position of 0 degrees on the front. Assuming this observation method, the R, G, and B colors are defined as the R light wavelength 620 nm, the G light wavelength 540 nm, and the B light wavelength 460 nm. From the equation, the spatial frequency of the hologram pattern formed in each of the R, G, and B hologram areas was determined.

Next, the ink ribbon used in the present invention will be described.
The ink ribbon used in the present invention is an ink ribbon of a sublimation transfer method and / or a melt transfer method, and has a process of transferring character information including a face photograph and / or personal information to an image display medium separately from an information pattern. Can be combined. Similar to a general ink ribbon, multicolor transfer of Y, M, and C can be performed. The transfer of the ink ribbon can be performed before or after the transfer of the hologram ribbon, and the ink ribbon can be a roll integrated with the hologram ribbon. In addition to Y, M, and C, a black (K) ink ribbon may be combined.

Next, the base material used in the present invention will be described.
The substrate used in the present invention is a transfer medium onto which a ribbon or an intermediate foil is transferred, and a passport, a visa, or various cards are assumed, but is not limited thereto. Further, if necessary, a fine pattern or an adhesive anchor can be provided. The base material is required to have a strength that does not cause paper peeling, delamination, breakage, or the like when the transferred ribbon or intermediate foil is peeled off.

Next, the intermediate foil used in the present invention will be described.
The intermediate foil used in the present invention is a transfer body to which the ribbon is transferred and at the same time the intermediate foil itself is transferred to the substrate. The layer structure includes at least a support, a peeling protective layer, and a transferred layer. If necessary, a hologram forming layer, a reflective layer, and the like can be provided between the protective layer and the transferred layer. Further, the transferred layer can also have a function as an image receiving layer and / or an adhesive layer as required.

  If the transferred layer does not function as an adhesive layer, the intermediate foil transfers the hologram ribbon to the transferred layer, and then the adhesive ribbon described below is transferred onto the transferred layer and thermally transferred onto the substrate. The After the intermediate foil is bonded onto the substrate by thermal transfer, it is peeled off from the support, so that the peel protection layer is exposed on the outermost surface. The peeling protective layer used for the intermediate foil has sufficient adhesion at the time of transfer of the ribbon, and is required to be surely peeled off at the time of transfer to the substrate.

  Since the intermediate foil is exposed to the surface of the image display medium after being transferred to the base material, it is desirable to be transparent in order to increase the visibility of the information pattern and the printed fine pattern. It is also possible to color with. It is also possible to provide an opaque reflective layer represented by any one or combination of halftone dots, lines, and figures on a part of the intermediate foil. The striped pattern is concealed.

Next, the adhesive ribbon used in the present invention will be described.
The adhesive ribbon used in the present invention improves the adhesion between the hologram ribbon transferred onto the intermediate foil and / or the ink ribbon and the substrate, in addition to improving the adhesion between the transfer layer of the intermediate foil and the substrate. Therefore, it is used for improving durability as an image display medium. Although the transfer of the adhesive ribbon is performed after the transfer of the hologram ribbon and / or the ink ribbon, the adhesive ribbon may be a roll integrated with the hologram ribbon and / or the ink ribbon.

  Hereinafter, the present invention will be specifically described with reference to examples.

  First, the first embodiment will be described.

  FIG. 2 schematically shows the configuration of the hologram ribbon according to the first embodiment. As illustrated in FIG. 2, a release layer 12, a hologram forming layer 13, a reflective layer 14, and an adhesive layer 15 are laminated in that order on one surface of the support 11. A back coat layer 16 is formed on the other surface of the support 11. The hologram ribbon is a transfer foil, which is sequentially transferred as dots having a very small area onto a transfer medium using a thermal head to form an information pattern.

  FIG. 3 schematically shows the configuration of the image display medium 1 according to the first embodiment. As illustrated in FIG. 3, on the base material 2, three types of hologram ribbons 21 whose observation colors in a specific viewing zone are the three primary colors R, G, and B, and Y, M, and C ink ribbons 22, The information pattern 23 expressed by the transfer is formed.

As shown in FIG. 3, the information pattern 23 has three horizontal dots as one unit, and white 201, red 202, green 203, blue 204, yellow 205, red 206, indigo 207, black in this unit. 208 eight colors are possible. When expressing white, all the R, G, B hologram ribbons are transferred and expressed. When red, green, and blue are expressed, they are expressed by transferring R hologram ribbon + M ink ribbon + Y ink ribbon, G hologram ribbon + C ink ribbon + Y ink ribbon, B hologram ribbon + C ink ribbon + M ink ribbon, respectively. When expressing yellow, red, and indigo, they are expressed by transferring R hologram ribbon + G hologram ribbon + Y ink ribbon, R hologram ribbon + B hologram ribbon + M ink ribbon, G hologram ribbon + B hologram ribbon + C ink ribbon, respectively. . When black is expressed, all Y, M, and C ink ribbons are transferred and expressed. In the example of FIG. 3, all the ribbons are directly transferred onto the substrate 2 without overlapping.

  With such a configuration, when the image display medium 1 is viewed from a specific angle, the information pattern 23 is 8 by the three types of hologram ribbons 21 in which the observation colors in the specific viewing zone are the three primary colors R, G, and B. As a color dither image, it can be visually recognized as a hologram pattern having color information. On the other hand, when the image display medium 1 is viewed from an angle at which the diffracted light of the hologram is not observed, the hologram pattern is not observed, and only the information pattern 23 formed by the ink ribbon 22 is visible.

A specific example of the method for creating the image display medium 1 according to the first embodiment will be described below.
First, a hologram ribbon is created. That is, a polyethylene terephthalate film having a thickness of 12 μm was used as the support 11, and printing was performed with a gravure coater in the order of the release layer 12 and the hologram forming layer 13. After drying in the oven, the release layer 12 had a thickness of 0.6 μm, and the hologram formation layer 13 had a thickness of 0.7 μm.

  Next, the film on which the release layer 12 and the hologram forming layer 13 were formed was hot-pressed with a roll embossing device, thereby forming a hologram pattern on the hologram forming layer 13.

  Next, aluminum deposition was performed on the hologram forming layer 13 as the reflective layer 14 to form a metal thin film layer. The film thickness of aluminum vapor deposition was 50 nm.

  Next, the adhesive layer 15 was printed on the film on which the reflective layer 14 was formed, and the back coating layer 16 was formed by performing back coating on the opposite surface of the support 11 to obtain a hologram ribbon. The film thickness of both the adhesive layer 15 and the back coat layer 16 was 0.6 μm.

  Next, an ink ribbon is created. That is, a polyethylene terephthalate film having a thickness of 4.5 μm was used as a support, and printing was performed with a gravure coater in the order of a backcoat layer, a sublimation cyan layer, a sublimation magenta layer, and a sublimation yellow layer to obtain an ink ribbon. After drying in the oven, the film thickness of the backcoat layer was 0.8 μm.

  Next, full-color face image information was prepared as the information pattern 23 and converted into a dither image of eight colors (red, green, blue, yellow, red, indigo, white, black) of 150 dpi vertically and 100 dpi horizontally.

  This converted dither image was color-separated into R, G, and B, and the hologram ribbon of the corresponding color was transferred based on the respective information. The transfer was performed on a white plastic card using a thermal head. At this time, the horizontal direction of the dots was divided into three, and transfer was performed so that the hologram ribbons did not overlap with each other with a width corresponding to 300 dpi. The order of arrangement was R, G, B from the right.

  Similarly, the converted dither image was color-separated into Y, M, and C, and the ink ribbon of the corresponding color was transferred based on the respective information. Similar to the hologram ribbon, the horizontal direction of the dots was divided into three, and the transfer was performed so that the ink ribbons did not overlap each other with a width corresponding to 300 dpi. The image display medium of the present invention, in which the arrangement order is C, M, Y from the right and all ribbons are transferred without overlapping by aligning and transferring onto the white plastic card onto which the hologram ribbon is transferred. 1 was obtained.

  Next, a second embodiment will be described.

  4 and 5 schematically show the configuration of the image display medium 1 according to the second embodiment. As illustrated in FIG. 4, the information pattern 23 represented by the hologram ribbon 21 and the Y, M, and C ink ribbons 22 is formed on the substrate 2 in the same manner as in the first embodiment. An intermediate foil 3 is formed on the information pattern 23. In this case, as shown in FIG. 5, the intermediate foil 3 is formed on the base material 2 so as to cover the information pattern 23.

Hereinafter, a specific example of the method for creating the image display medium 1 according to the second embodiment will be described.
First, a hologram ribbon is created. That is, the hologram ribbon was prepared in the same manner as in the first example except that the aluminum vapor deposition was changed to ZnS vapor deposition and a transparent reflective layer was provided.

  Next, the intermediate foil 3 is created. That is, using a polyethylene terephthalate film having a thickness of 25 μm as a support, printing was performed with a gravure coater in the order of the peel protection layer and the transfer layer, thereby obtaining an intermediate foil 3. After drying in the oven, the film thickness of the release protective layer was 1.2 μm, and the film thickness of the transferred layer was 1.0 μm.

  Next, using a thermal head, the hologram ribbon 21 and the ink ribbon 22 were transferred onto the transfer target layer of the intermediate foil 3, and then the intermediate foil 3 was transferred onto the cardboard on which the adhesive anchor was printed. Thus, the image display medium 1 of the present invention having the configuration of the base material 2, the information pattern 23, and the intermediate foil 3 was obtained.

  The image display medium 1 of the present embodiment configured as described above has high anti-counterfeiting properties by matching the constituent images of the information pattern 23 by the ink ribbon 22 and the information pattern by the hologram ribbon 21 and the method of expressing the printed dots. It will have.

  DESCRIPTION OF SYMBOLS 1 ... Image display medium, 2 ... Base material, 3 ... Intermediate foil, 11 ... Support body, 12 ... Release layer, 13 ... Hologram formation layer, 14 ... Reflective layer, 15 ... Adhesive layer, 16 ... Backcoat layer, 21 ... Hologram ribbon, 22 ... ink ribbon, 23 ... information pattern, 100 ... white irradiation light, 101 ... observation point.

Claims (7)

Three types of hologram ribbons with three primary colors R (red), G (green), and B (blue) as observed colors in a specific viewing area, and inks of Y (yellow), M (magenta), and C (cyan) An image display medium in which an information pattern is formed by sequentially transferring dots as small area dots using a ribbon,
The information pattern is composed of a transfer area divided into three, and either R or C is transferred to the first area, and either G or M is transferred to the second area. An image display medium in which either B or Y is transferred to the area . The image display medium according to claim 1, wherein the reflection layer of the hologram ribbon is a transparent reflection layer. The image display medium of claim 1 Symbol placement, wherein the reflective layer of the hologram ribbon is a metal thin film layer. The image display medium according to claim 1, wherein the information pattern is a face photograph of an owner or a user of the image display medium. An information pattern is formed by sequentially transferring dots as micro-area dots using three types of hologram ribbons in which the observation colors in a specific viewing zone are the three primary colors of R, G, and B, and ink ribbons of Y, M, and C. An image forming method for forming
When forming the information pattern, the transfer area is divided into three, one of R and C is transferred to the first area, one of G and M is transferred to the second area, 3. An image forming method, wherein one of B and Y is transferred to the area 3. 6. The image forming method according to claim 5, wherein the hologram ribbon and the ink ribbon are provided on the same substrate, and all the ribbons are transferred by the same thermal head. 7. The image forming method according to claim 5, wherein at least one of the transfer of the hologram ribbon and the transfer of the ink ribbon is performed on an intermediate transfer foil and then transferred to a substrate.

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