JP5685874B2 - Personal authentication medium - Google Patents

Description

  The present invention relates to a personal authentication medium, for example, a personal authentication medium using an image display technique that can be used for personal authentication.

Many personal authentication media such as passports and ID (identification) cards use facial images to enable visual personal 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, for example, a thermal transfer recording method using a transfer ribbon has been studied.
As means for creating a personal authentication medium by a thermal transfer recording method, there is a means for forming and carrying information such as images and characters on an intermediate transfer medium and further transferring and forming it on an information recording transfer medium comprising a substrate.

  The intermediate transfer medium capable of thermal transfer used for the creation of the personal authentication medium has a release layer, an intermediate layer, an adhesive layer, and the like sequentially provided on the support as a transfer layer from the support side. It is a medium which is superimposed on a substrate of a transfer target, is pressurized and is transferred to the substrate by heating from either the support side or the substrate side.

A peeling layer is a layer provided in order to implement | achieve these favorable peeling, when the interface of a support body and a transfer layer does not peel well at the time of transcription | transfer by the compatibility of each material.
The intermediate layer is a layer existing between the adhesive layer and the release layer and may be appropriately designed as necessary. For example, an OVD (Optically Variable Device) forming layer having a diffractive structure can be cited as a layer for improving the adhesive force between the two and a layer for preventing forgery and improving decorativeness.

The adhesive layer is a layer that adheres to the substrate by heat and pressure, and can be an image receiving layer / adhesive layer that also serves as an image receiving layer that forms information such as images and characters with a heat transfer material.
The image-receiving layer and the image-receiving layer / adhesive layer are layers having an image receiving ability capable of recording image information (including characters, symbols, etc.) without a printing plate by a thermal transfer printer or an ink jet printer. It is possible to provide a printed image with a dye or pigment before transfer of the medium.

  As a method of forming information on the image receiving layer / adhesive layer, the intermediate transfer medium is transported to a transfer device which is composed mainly of a drum and a thermal head, and the color of the transfer ribbon whose color material is a heat transfer material is used. The material layer is brought into contact with the image receiving layer / adhesive layer of the intermediate transfer medium, the thermal head is pressed from the transfer ribbon side, and the heating element group of the thermal head is appropriately heated based on the image data, thereby generating image data. An image pattern based on the above is formed and printed on the image receiving layer / adhesive layer.

  In addition, a relief hologram or diffraction grating composed of a fine uneven pattern is formed on the transfer ribbon, and a transparent thin film layer is provided along the fine uneven surface to form a relief hologram or diffraction grating. By using a transfer ribbon made of a heat transfer material made of a transparent thin film layer having a higher refractive index than that of the layer, it is possible to record an image pattern of individual information using a relief hologram or a diffraction grating.

  Furthermore, the OVD formation layer is intended for decorativeness and forgery prevention. For example, the OVD formation layer is provided along the fine uneven surface and the OVD formation layer on which a relief hologram or diffraction grating composed of a fine uneven pattern is formed. The OVD forming layer is composed of a transparent thin film layer made of a material having a different refractive index. As described above, the intermediate transfer medium using a relief hologram as the intermediate layer is widely used because it can be manufactured in large quantities at low cost by the emboss replication method and dead copy is difficult.

  As an example of the transfer method to the base material, the adhesive layer or the image receiving layer / adhesive layer of the intermediate transfer medium is brought into contact with the medium to be transferred, and heating of a heat roll, a hot plate, etc. from the support side of the intermediate transfer medium The medium is pressed and heated to the transfer temperature to cause the adhesive layer to be pressure-bonded to the substrate that is the transfer medium, and the support is peeled from the intermediate transfer medium. Thereby, a personal authentication medium can be obtained. Further, depending on the material of the base material, transfer is facilitated by forming an easy adhesion layer on the base material.

  By the way, as a base material used for a personal authentication medium, particularly a passport, a paper base material is often used, and a base material having a large surface irregularity is often used. This is because the unevenness of the surface is large, so it is difficult to print directly with an easily available printing machine, and it is effective in preventing forgery and alteration by using paper that is generally difficult to obtain. .

However, since the image pattern recorded on the intermediate transfer medium is transferred along the unevenness in the uneven portions of these base materials, the surface roughness after the transfer depends on the surface roughness of the base material. . Here, the image pattern of the individual information recorded by the relief hologram or the diffraction grating is affected by the surface unevenness, and the luminance of the diffracted light to be reproduced is lowered.
Furthermore, since the method of applying heat pressure is different between the uneven portions on the surface of the base material, a difference occurs in the adhesion strength of the intermediate transfer medium, which may cause partial damage when a load is applied. This problem is particularly noticeable when the base material is paper. Depending on the type of paper, the fiber gap is large, so the intermediate transfer member and the base material may not be in close contact with each other in the gap portion, which may cause partial destruction. was there.

  In order to prevent this, it is effective to provide an easy-adhesion layer for improving adhesion on the substrate surface. The image forming apparatus disclosed in Patent Document 1 is an apparatus that can perform thermal transfer of an easy-adhesion layer to an intermediate transfer medium when an image pattern of the intermediate transfer medium is transferred to a transfer target. According to this apparatus, it is possible to improve the adhesion to the surface of the paper having large unevenness.

  However, since the unevenness of the surface of the base material has not been eliminated, when an image pattern of individual information recorded by a relief hologram or diffraction grating is transferred, it is reproduced due to the unevenness of the surface of the base material. A decrease in the brightness of the diffracted light is inevitable.

Japanese Patent No. 3632516

  The present invention has been made in view of the above points, and its purpose is to provide individual information recorded on an intermediate transfer medium by a relief hologram or diffraction grating without being affected by the inherent surface irregularities of the transferred object. It is an object of the present invention to provide a personal authentication medium that can suppress a decrease in luminance.

The present invention has been made in order to solve the above-mentioned problems. The invention according to claim 1 is characterized in that a relief hologram or diffraction grating having an image receiving layer for transfer and comprising a fine uneven pattern is used as a personal authentication image. Thermal transfer recording image by selective heating to the thermal transfer recording medium based on image information in a state where the colored layer and the image receiving layer of the thermal transfer recording medium having a colored layer are superimposed on the formed intermediate transfer medium The intermediate transfer medium on which the thermal transfer recording image is written is brought into pressure contact with the transfer medium and heated to transfer the thermal transfer recording image to the transfer medium. a personal authentication medium to the image forming material is formed on the body, the surface of the transfer member the image-receiving layer is pressed against has an uneven portion of the該被transcript specific surface roughness, the object to be transferred Flat portion of the image formation surface roughness smaller than a surface roughness of the uneven portion in the transcribed region of the surface is formed, the background pattern is formed in a region of the flat portion, the surface of the tint block, It has a surface roughness different from the surface roughness of the flat portion .

According to a second aspect of the present invention, in the personal authentication medium according to the first aspect, the surface roughness of the tint block is the same as the surface roughness of the uneven portion.

According to a third aspect of the present invention, in the personal authentication medium according to the first or second aspect , an embossed metal plate or a calendering metal cylinder is used for forming the tint block, and the embossing metal plate or the calendering metal cylinder is used. Has a convex portion or a concave portion for forming a tint block provided on each surface.

A fourth aspect of the present invention is the personal authentication medium according to any one of the first to third aspects, wherein the flat portion is formed by an embossing process or a calendar process.

According to a fifth aspect of the present invention, in the personal authentication medium according to any one of the first to fourth aspects, the relief hologram or diffraction grating composed of the fine concavo-convex pattern is formed on the intermediate transfer medium along the concavo-convex surface of the diffraction grating. A transparent thin film layer is provided, and the refractive index of the transparent thin film layer is different from the refractive index of the layer on which the relief hologram or diffraction grating is formed.

A sixth aspect of the present invention is the personal authentication medium according to any one of the first to fifth aspects, wherein the outer shell of the particle is formed of a thermoplastic material on the surface of the transferred body. An easy-adhesion layer containing is provided.

A seventh aspect of the present invention is the personal authentication medium according to any one of the first to sixth aspects, wherein the surface of the flat portion has a center line surface roughness Ra based on JIS B 0601-2001 of 0.2 μm or more to 2 or more. 0.0 μm or less.

The invention according to claim 8 is the personal authentication medium according to any one of claims 1 to 7 , wherein the center line surface roughness Ra based on JIS B 0601-2001 of the surface of the flat part and the center of the surface of the uneven part. The difference from the line surface roughness Ra is 0.5 μm to 80 μm.

  According to the personal authentication medium of the present invention, the flat portion having a surface roughness smaller than the surface roughness of the uneven portion unique to the transfer object is transferred to the transfer area of the image formed product on the side that contacts the intermediate transfer medium of the transfer object. Therefore, the personal authentication image is not affected by the uneven portions unique to the transfer object. Thereby, the brightness | luminance fall of a personal authentication image can be suppressed, and a personal authentication can be performed with a bright image in the case of visual personal authentication. In addition, the brightness of only the personal authentication image portion can be improved, and in other portions, the surface irregularities unique to the transfer object are maintained, thereby making it possible to perform authenticity determination based on the texture.

  In addition, according to the present invention, since the background pattern is provided in the flat area of the transfer object, the area displaying the personal authentication image can be easily recognized, and the flat area has the background pattern. By having it, an anti-counterfeit effect can be expected.

  Further, according to the present invention, by making the surface roughness of the tint block different from the surface roughness of the flat portion, the background of the personal authentication image can be changed, and a further forgery prevention effect can be obtained.

  In addition, according to the present invention, the flat portion of the transferred body is flattened by embossing or calendering, so that the surface roughness of a desired region can be reliably obtained in a short period of time. It becomes possible to make it smaller than roughness.

  In addition, according to the present invention, since the tint block is formed by using the embossed metal plate or the calendar processing metal cylinder having the convex or concave portions for forming the tint block pattern, the tint block pattern is easily provided on the background of the personal authentication image. Can get to.

  In addition, according to the present invention, the transmissive thin film layer is provided on the intermediate transfer medium along the concavo-convex surface of the relief hologram or diffraction grating configured with a fine concavo-convex pattern. Since the refractive index is different from the refractive index of the layer on which the relief hologram or diffraction grating is formed, the brightness of the relief hologram or diffraction grating can be further improved.

  Further, according to the present invention, the surface irregularity of the transferred object is provided by providing the surface of the transferred object with an easy adhesion layer containing thermally foamable particles whose outer shell is composed of a thermoplastic material. Even when the thickness is large or deep, the foamable particles foam by heating and pressurization, so that the unevenness can be surely flattened.

  Further, according to the present invention, the surface roughness Ra of the flat portion is set to 0.2 μm or more to 2.0 μm or less, so that the relief hologram or the diffraction grating reduces the luminance due to the unevenness on the transferred body. It becomes possible to prevent.

  In addition, according to the present invention, the difference between the surface roughness Ra of the flat portion and the surface roughness Ra of the concavo-convex portion is 0.5 μm or more to 80 μm. As a result, the visibility of the tint block pattern forming the background of the personal authentication image can be improved.

1 is a cross-sectional view schematically showing an intermediate transfer medium that is an example of a personal authentication medium according to the present invention. FIG. 2 is a cross-sectional view schematically illustrating an example in which an image is printed on the intermediate transfer medium in FIG. 1. Sectional drawing which shows schematically an example of the transfer method of the image of a thermal transfer recording medium. Sectional drawing which shows roughly an example of the transfer method of the image of the thermal transfer recording medium in which the diffraction grating of the personal authentication medium was formed on the support body. Sectional drawing which shows roughly an example of the to-be-transferred body of a personal authentication medium. FIG. 6 is a cross-sectional view schematically illustrating a state where the intermediate transfer medium illustrated in FIG. 2 is transferred to the transfer target illustrated in FIG. 5. Sectional drawing which shows roughly an example which performed the planarization process to the to-be-transferred body of the personal authentication medium concerning this invention. FIG. 8 is a cross-sectional view schematically illustrating a state where the intermediate transfer medium illustrated in FIG. 2 is transferred to the transfer target illustrated in FIG. 7. The top view which shows roughly the personal authentication image of the personal authentication medium concerning this invention. The top view which shows roughly the to-be-transferred body which transcribe | transferred the ground pattern of the personal authentication medium concerning this invention. Schematic which shows an example of the method of transcribe | transferring the tint block pattern concerning this invention to a to-be-transferred body. The top view which shows roughly the personal authentication image which transcribe | transferred the ground pattern of the personal authentication medium concerning this invention.

  Embodiments of a personal authentication medium according to the present invention will be described below in detail with reference to the drawings. In addition, the same referential mark is attached | subjected to the component which exhibits the same or similar function through all the drawings, and the overlapping description is abbreviate | omitted.

(Embodiment 1)
In the present embodiment, as shown in FIG. 1, the intermediate transfer medium 10 constituting the personal authentication medium includes a support layer 11 having a release layer 12, an OVD forming layer 13, a reflective layer 14, and an image receiving layer / adhesive layer 15. In this order, they are stacked and arranged.

The support 11 is, for example, a resin film or a sheet. The support 11 is made of a material having excellent heat resistance such as polyethylene terephthalate. For example, a release layer containing a fluororesin or a silicone resin may be provided on the main surface 11a supporting the release layer 12 of the support 11.
The release layer 12 is formed on the support 11. The release layer 12 serves to stabilize the release of the OVD forming layer 13 from the support 11. The release layer 12 is light transmissive and is typically transparent. The release layer 12 is made of, for example, a thermoplastic resin.

  The OVD formation layer 13 is formed on the release layer 12. The OVD formation layer 13 includes at least one of a hologram and a diffraction grating as a diffraction structure. Here, the OVD formation layer 13 is a transparent layer having a relief structure as a diffraction structure on the surface. As a material for the transparent layer, a resin such as a photocurable resin, a thermosetting resin, and a thermoplastic resin can be used. Note that the OVD forming layer 13 may be a volume hologram.

The reflective layer 14 is formed on the OVD forming layer 13. Although the reflective layer 14 can be omitted, when the reflective layer 14 is provided, the visibility of the image displayed by the diffraction structure is improved.
As the reflection layer 14, for example, a transparent reflection layer or an opaque metal reflection layer can be used. The reflective layer 14 can be formed by, for example, a vacuum film forming method such as vacuum deposition or sputtering.

As the transparent reflective layer, for example, a layer made of a transparent material having a refractive index different from that of the OVD forming layer 13 can be used. The transparent reflective layer made of a transparent material may have a single layer structure or a multilayer structure. In the latter case, the transparent reflective layer may be designed so as to repeatedly cause reflection interference. As this transparent material, for example, a transparent dielectric such as zinc sulfide and titanium dioxide can be used.
Alternatively, a metal layer having a thickness of less than 20 nm may be used as the transparent reflective layer. As a material of the metal layer, for example, a single metal such as chromium, nickel, aluminum, iron, titanium, silver, gold, and copper, or an alloy thereof can be used.

Moreover, as the said opaque metal reflective layer, the metal layer similar to what was mentioned above about the transparent reflective layer except being thicker can be used.
The image receiving layer / adhesive layer 15 is formed on the reflective layer 14. The image receiving layer / adhesive layer 15 is made of, for example, a thermoplastic resin.

  As shown in FIG. 1, an image receiving layer / adhesive layer 15 of an intermediate transfer medium 10 in which a peeling layer 12, an OVD forming layer 13, a reflective layer 14, and an image receiving layer / adhesive layer 15 are laminated on a support 11 in the order shown. As shown in FIG. 2, a thermal transfer recorded image 20 and a personal authentication image 21 are provided on the surface opposite to the surface in contact with the reflective layer 14.

A method for transferring an image on a thermal transfer recording medium will be described.
As shown in FIG. 3, the thermal transfer recording medium 30 includes a support 31 having a release layer 32, a color material layer (colored layer using at least one of a pigment or dye serving as a color material) 33, and an adhesive layer 34. It is comprised by laminating and arranging in this order. Here, the color material layer 33 and the adhesive layer 34 are heat transfer materials.

  Next, the intermediate transfer medium 10 shown in FIG. 1 is transported to a transfer device which is composed mainly of a drum (not shown) and a thermal head 35, and the adhesive layer 34 of the thermal transfer recording medium 30 is transferred intermediately. It is brought into contact with the image receiving layer / adhesive layer 15 of the medium 10. At the same time, the thermal head 35 is pressed from the support 31 side of the thermal transfer recording medium 30 and the heat generating element group of the thermal head 35 is appropriately heated based on the image data, so that the image pattern based on the image data is transferred to the image receiving layer. It is formed on the cum adhesion layer 15.

Next, due to the heat generated by the thermal head 35, the release layer 32, the color material layer 33, and the adhesive layer 34 of the thermal transfer recording medium 30 are peeled off at the interface between the release layer 32 and the support 31 and transferred to the image receiving layer / adhesive layer 15. The The image transferred in this way becomes the thermal transfer recording image 20 shown in FIG.
Here, when the personal authentication medium is a passport, the thermal transfer recording image 20 includes a color image of a face photograph and text data such as name, nationality, and expiration date, and is an image expressed by a normal color material. It is.

A method for transferring an image of a thermal transfer recording medium in which a diffraction grating of a personal authentication medium is formed on a support will be described.
As shown in FIG. 4, the thermal transfer recording medium 40 is configured by laminating and arranging a peeling layer 42, an OVD forming layer 43, a reflective layer 44, and an adhesive layer 45 on a support 41 in the illustrated order. Here, the OVD forming layer 43, the reflective layer 44, and the adhesive layer 45 are heat transfer materials.

  Next, the intermediate transfer medium 10 shown in FIG. 1 is transported to a transfer device that is composed mainly of a drum (not shown) and a thermal head 35, and the adhesive layer 45 of the thermal transfer recording medium 40 is transferred to the intermediate transfer medium. It is brought into contact with the image receiving layer / adhesive layer 15 of the medium 10. At the same time, the thermal head 35 is pressed from the support 31 side of the thermal transfer recording medium 30 and the heat generating element group of the thermal head 35 is appropriately heated based on the image data, so that the image pattern based on the image data is transferred to the image receiving layer. It is formed on the cum adhesion layer 15.

Next, due to the heat generated by the thermal head 35, the release layer 42, the OVD forming layer 43, the reflective layer 44, and the adhesive layer 45 of the thermal transfer recording medium 40 are peeled off at the interface between the release layer 42 and the support 41, and the image receiving layer / adhesive layer 15 is transferred. The image thus transferred becomes the personal authentication image 21 shown in FIG.
Here, when the personal authentication medium is a passport, the personal authentication image 21 includes an image of a face photograph, a three-dimensional image, an image of a person's signature, and the like, and is an image used particularly when authenticating an individual.

As shown in FIG. 5, the surface of the transferred object 50 constituting the personal authentication medium has irregularities 51 unique to the transferred object. The surface roughness of the transferred object 50 having the irregularities 51 was 2.34 μm when the center line surface roughness Ra was measured based on JIS B 0601-2001.
In general, passport booklets often use paper with a large surface roughness compared to normal paper. By using a paper base with large surface irregularities, the eyes of the paper can be visually confirmed. And authenticity can be determined as an appearance impression. In addition, there is an effect of facilitating the determination of authenticity depending on the texture touched with the fingertip of the hand.

A case where the thermal transfer recording image 20 and the personal authentication image 21 of the intermediate transfer medium 10 shown in FIG. 2 are transferred to the transfer medium 50 shown in FIG. 5 will be described with reference to FIG.
The surface on which the thermal transfer recording image 20 and the personal authentication image 21 are transferred is brought into close contact with the surface having the irregularities 51 of the transfer object 50 on the image receiving layer / adhesive layer 15 of the intermediate transfer medium 10 shown in FIG. After pressurization, the support 11 is peeled from the release layer 12. Here, the intermediate transfer medium 10 in FIG. 6 is shown upside down with respect to that shown in FIG.
The thermal transfer recording image 20 and the personal authentication image 21 transferred to the image receiving layer / adhesive layer 15 shown in FIG. 2 are deformed along the unevenness 51 of the transfer target 50. As a result, the thermal transfer recording image 60 and the personal authentication image 61 have a cross-sectional shape as shown in FIG.

  Here, even if the thermal transfer recording image 60 composed of the color material layer is affected by the unevenness 51 of the transferred object 50, the contrast of the observation image is somewhat reduced, and the brightness of the observation image is reduced. There is almost no decline.

On the other hand, the personal authentication image 61 formed by transferring a relief hologram or diffraction grating composed of a fine uneven pattern from a thermal transfer recording medium is affected by the unevenness 51 of the transferred object 50. As a result, the diffracted light from the relief hologram or diffraction grating spreads due to the unevenness, and the luminance of the reproduction light decreases.
Here, when the unevenness 51 of the transferred object 50 is larger, the OVD formation layer 13 and the reflection layer 14 are also affected, and the luminance of the reproduced image from the OVD formation layer 13 is also lowered. End up.

FIG. 7 shows an example of the case where the transfer target 70 of the personal authentication medium is flattened. The transferred body 70 shown in FIG. 7 is provided with a flat portion 72 in addition to the unique uneven portion 71 of the transferred body 70 by partially flattening the uneven surface unique to the transferred body. Yes.
The partial flattening process of the transfer body 70 is performed by selectively heating and pressurizing a region where the flattening process is performed by an embossing process or a calendar process on the unique uneven surface of the transfer target body 70. Is called. In the case of embossing, the flat metal plate is heated, and the heated metal plate is pressed against the portion to be flattened and pressed to flatten the uneven portion 71. Thereby, the flat part 72 is formed.

In the case of calendering, the metal cylinder is heated, pressed against the portion to be flattened, and flattened by moving the range of the region to be flattened while applying pressure. In this example, planarization was performed by embossing. In this case, a metal plate having a plane part of 30 mm × 40 mm was treated under conditions of a pressure of 500 kg, a temperature of 150 ° C., and a pressurization time of 7 seconds.
As a result, the surface roughness of the concavo-convex portion 71 of the transferred body 70 is based on JIS B 0601-2001, the centerline surface roughness Ra is 2.34 μm, and the centerline surface roughness Ra at the flat portion 72 is 1.48 μm.
The surface roughness Ra of the flat portion 72 is not limited to 1.48 μm. If the surface roughness Ra of the flat portion 72 is set in the range of 0.2 μm to 2.0 μm, the relief The type hologram or diffraction grating can prevent a decrease in luminance due to the influence of unevenness on the transfer target.

A case where the thermal transfer recording image 20 and the personal authentication image 21 of the intermediate transfer medium 10 shown in FIG. 2 are transferred to the transfer medium 70 shown in FIG. 7 will be described with reference to FIG.
The side on which the thermal transfer recording image 20 and the personal authentication image 21 are transferred to the image receiving layer / adhesive layer 15 of the intermediate transfer medium 10 shown in FIG. Then, the support 11 is peeled from the release layer 12.
In this case, the portion of the image-receiving layer / adhesive layer 15 shown in FIG. 2 to which the thermal transfer recording image 20 has been transferred is transferred with the concavo-convex portions 71 of the transfer body 70 facing each other to transfer the personal authentication image 21. The transfer is performed with the flat portion 72 of the transfer target 70 facing the portion.

  After the transfer, the thermal transfer recording image 20 transferred to the image receiving layer / adhesive layer 15 shown in FIG. 2 is deformed along the concave / convex shape of the concave / convex portion 71 of the transfer body 70, and the thermal transfer recording image shown in FIG. The cross-sectional shape is 80. However, since the personal authentication image 21 is transferred to the flat portion 72 of the transfer target 70, it is transferred as the personal authentication image 81 without being deformed as shown in FIG.

  For this reason, the personal authentication image 81 is not affected by the unique concavo-convex portion of the transferred body 70. As a result, the diffracted light from the relief hologram or diffraction grating is not ideally reproduced, and the brightness does not decrease. Further, in the area that is not flattened, the original surface unevenness of the transfer object is maintained, so that the appearance is different and it is possible to perform authenticity determination based on the texture.

Further, by providing an easy-adhesion layer containing thermally foamable particles whose outer shell of particles is made of a thermoplastic material on the surface of the transfer object 70, the easy-adhesion layer is obtained by heating and pressing during planarization. The outer shell of the material and heat-expandable particles soften and the particles expand due to the gas pressure inside, and the easy-adhesion layer flows and fills the voids on the surface of the substrate, while the transferred object and the flattening metal The gap with the surface can be eliminated.
As a result, even on a paper substrate with many voids where the unevenness of the transferred material is large and cannot be flattened, the uneven portions are reliably flattened by foaming the foamable particles by heating and pressurization. It becomes possible.

FIG. 9 shows a state where the personal authentication image 91 is transferred from the intermediate transfer medium onto the surface of the transfer object 90.
In FIG. 9, the flattened area 93 subjected to the flattening process is wider than the image transfer area 92 to which the personal authentication image 91 is transferred. For this reason, the boundary between the non-flattened region 94 and the flattened region 93 that has not been flattened differs in appearance due to the difference in surface roughness, and the flattened region 93 is different from the personal authentication image 91. The effect is like a picture frame. This facilitates confirmation of the personal authentication image when performing personal authentication.

  In the example shown in FIG. 9, the flattened region 93 has a rectangular shape, but this region may have a special shape. For example, a circular or elliptical shape, or a fine decorative pattern around the periphery may be provided. By doing so, the flattening process becomes complicated, so that it cannot be easily counterfeited.

  In FIG. 10, a flattened region 101 is provided on the surface of the transfer object 100, and a region where a flattening process having a specific shape is not performed inside the flattened region 101. Here, a tint block pattern 102 having a star shape is formed.

FIG. 11 is a conceptual diagram of a calendar device for performing a flattening process on the transfer target 100 as shown in FIG.
In FIG. 11, the planarized region 101 is formed by moving the transfer target 100 sandwiched between the planarizing roll 110 and the pressure roll 111 while heating and pressing.
Here, on the surface of the flattening roll 110, a plurality of tint block molds 112 are engraved in a star shape so as to be dug one step below the roll surface. By using this roll, the star pattern 102 can be transferred to the flattened region 101 of the transfer target 100. The inside of the star-shaped background pattern 102 is not flattened. That is, the inner portion of the background pattern 102 has the same uneven surface as the inherent uneven surface of the transfer target 100.

  As a method of providing the tint block pattern 112 on the surface of the flattening roll 110, methods such as cutting, etching, and laser processing can be used. Further, even when embossing is performed using a flat metal plate, planarization can be performed in the same manner. Even in this case, the tint block pattern can be provided on the flat metal plate by the same method.

A case where the personal authentication image 120 is transferred from the intermediate transfer medium to the surface of the transfer target 100 shown in FIG. 10 will be described with reference to FIG.
In FIG. 12, the personal authentication image 120 is transferred inside the flattened area 101. Since the inner portion of the background pattern 102 is not flattened, the luminance of the reproduced image is lowered at the portion of the background pattern 102 to which the relief hologram or diffraction grating is transferred, and the background pattern can be identified. Further, since the surface roughness of the tint block pattern 102 on which the relief hologram or the diffraction grating is not transferred differs from the surroundings, the tint block pattern can be identified.
Note that the background pattern formed in the flat portion of the transfer target is not limited to the star-shaped background pattern as shown in FIG. 10 and may have any shape as long as the background of the personal authentication image can be formed. May be.

  Here, the center line surface roughness Ra based on JIS B 0601-2001 on the surface of the transfer object in the area where the flattening process of the transfer object is performed, and the center line surface of the substrate surface in the area where the flattening process is not performed By making the difference in roughness Ra 0.5 μm or more to 80 μm or less, different areas can be seen in the areas with and without the flattening process. It becomes possible to improve the property.

  The present invention relates to an image forming body that prints, prints, and draws a face image and a fingerprint that are personally important on an article with an image forming body such as a booklet such as a passport or a visa, and an article with an image forming body. In particular, personal information such as image information, such as the image of the legitimate owner's face and fingerprints, is configured by arranging multiple cells with diffraction gratings, and colored layers with colored patterns and line patterns on the upper and lower layers. This makes it difficult for counterfeiting and tampering, and makes it easier for an examiner performing personal identification to discriminate what is fraudulent and to authenticate more accurately.

  DESCRIPTION OF SYMBOLS 10 ... Intermediate transfer medium 11, 31, 41 ... Support, 12, 32, 42 ... Release layer, 13, 43 ... OVD forming layer, 14, 44 ... Reflective layer, 15 ... Image receiving layer Adhesive layer, 20, 60, 80 ... thermal transfer recording image, 21, 61, 81, 91, 120 ... personal identification image, 30, 40 ... thermal transfer recording medium, 33 ... color material layer, 34, 45 ...... Adhesive layer, 35 ... thermal head, 50, 70 ... transfer object, 51 ... surface unevenness, 62,82,90,100 ... personal authentication medium, 71 ... concave / convex part, 72 ... flat part , 92 ... Image transfer area, 93, 101 ... Flattened area, 94 ... Non-flattened area, 102 ... Ground pattern, 110 ... Flatten roll, 111 ... Pressure roll, 112 ... Pattern .

Claims (8)

The colored layer and the image receiving layer of a thermal transfer recording medium having a colored layer on an intermediate transfer medium having an image receiving layer for transfer and a relief hologram or diffraction grating composed of a fine concavo-convex pattern formed as a personal authentication image A thermal transfer recording image is written by selective heating to the thermal transfer recording medium based on image information in a state where the layers are overlapped, and the intermediate transfer medium on which the thermal transfer recording image is written is pressed to the transfer target A personal authentication medium in which an image-formed product is formed on the transferred body obtained by transferring the thermal transfer recording image to the transferred body by heating by contact,
The surface of the transfer object to which the image receiving layer is pressed is provided with an uneven part having a surface roughness unique to the transfer object, and the uneven part is transferred to a region where the image-formed product is transferred on the surface of the transfer object. A flat portion having a surface roughness smaller than the surface roughness of is formed ,
A tint block is formed in the area of the flat part,
The surface of the tint block has a surface roughness different from the surface roughness of the flat portion,
A personal authentication medium characterized by that. Personal authentication medium according to claim 1, wherein the surface roughness of the tint block is the same as the surface roughness of the uneven portion. Embossing the metal plate or calendered metal cylinder is used for forming the background pattern, the embossed metal plate or the calendering metal cylinder that has a convex portion or concave portion for tint block formation provided on the respective surfaces The personal authentication medium according to claim 1 or 2 . The plateau personal authentication medium according to any one of claims 1 to 3, characterized in that it is formed by embossing or calendering. A transmissive thin film layer is provided on the intermediate transfer medium along the concavo-convex surface of the relief hologram or diffraction grating composed of the fine concavo-convex pattern, and the refractive index of the transmissive thin film layer is the relief hologram or diffraction grating. personal authentication medium of any one of claims 1 to 4, characterized in the different refractive index of the formed layer of. Wherein the surface of the material to be transferred, either of claims 1 to 5, characterized in that the adhesive layer is an outer shell containing a heat expandable particles composed of thermoplastic material particles are provided 1 Personal authentication medium described in the section. The personal authentication according to any one of claims 1 to 6, wherein a center line surface roughness Ra based on JIS B 0601-2001 of the surface of the flat portion is 0.2 µm or more and 2.0 µm or less. Medium. The difference between the centerline surface roughness Ra based on JIS B 0601-2001 on the surface of the flat portion and the centerline surface roughness Ra of the surface of the concavo-convex portion is 0.5 μm to 80 μm. Item 8. The personal authentication medium according to any one of Items 1 to 7 .

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