WO2016208590A1 - Medium for forming hologram image, and image display medium using same - Google Patents

Medium for forming hologram image, and image display medium using same Download PDF

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Publication number
WO2016208590A1
WO2016208590A1 PCT/JP2016/068422 JP2016068422W WO2016208590A1 WO 2016208590 A1 WO2016208590 A1 WO 2016208590A1 JP 2016068422 W JP2016068422 W JP 2016068422W WO 2016208590 A1 WO2016208590 A1 WO 2016208590A1
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WO
WIPO (PCT)
Prior art keywords
layer
image
hologram image
fine particles
wavelength
Prior art date
Application number
PCT/JP2016/068422
Other languages
French (fr)
Japanese (ja)
Inventor
朋芳 貝塚
Original Assignee
凸版印刷株式会社
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Application filed by 凸版印刷株式会社 filed Critical 凸版印刷株式会社
Priority to JP2017524926A priority Critical patent/JP6724915B2/en
Publication of WO2016208590A1 publication Critical patent/WO2016208590A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/309—Photographs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording

Definitions

  • the present invention relates to a hologram image forming medium and an image display medium using the same.
  • passports and ID (Identification) cards have face images to enable visual personal authentication.
  • face images For example, in a passport, conventionally, photographic paper on which a face image is printed is pasted on a booklet.
  • a passport may be tampered with by changing the photographic paper.
  • a recording method using an ink jet printer for example, see Patent Document 1
  • a laser printing recording method using a carbon dioxide gas or a YAG laser and a thermal color former for example, Patent Document 2.
  • a laser engraving printing recording method for example, Patent Document 3 in which carbon (C) existing in the substrate is used for printing recording in the depth direction of the substrate.
  • an image display body including this kind of personal authentication data an image display body provided with an image pattern formed on the basis of image data on a card substrate made of polyvinyl chloride or the like is known.
  • an image display that displays an OVD (Optical Variable Device) image in addition to the image pattern is known.
  • the OVD image is an image displayed using a hologram, a diffraction grating, an optical thin film using multilayer interference, or the like. According to the optical thin film, an effect such as color shift can be obtained by optical design.
  • Such an OVD transfer foil performs a sufficient function as an anti-counterfeiting effect, but is formed by thermally transferring an OVD transfer layer on the image after forming an image such as a face photograph like a passport. Therefore, at the present time when the forgery technology has been developed, there is a possibility that the transfer layer is temporarily removed by some method, and after the image data or the like is altered, the OVD transfer layer is placed again.
  • the OVD transfer layer is stretched over the face of the printed photo, so that the image data is falsified. There is a possibility.
  • thermal transfer, ink jet, or electrophotographic printers as means for forming image information such as facial photographs have been widely used nowadays, after the image forming portion has been removed. It is not necessarily difficult to form a new image in a region.
  • a method of giving a plurality of pieces of information for identifying an individual such as a face photograph to a personal authentication medium is considered.
  • a direct thermal transfer method using a hologram ribbon in which image information such as a face photograph is formed by a hologram or a diffraction grating, is known (for example, see Patent Document 4).
  • Patent Document 4 a direct thermal transfer method using a hologram ribbon, in which image information such as a face photograph is formed by a hologram or a diffraction grating.
  • it is conceivable to use a hologram image and a colored ink image in combination for example, see Patent Documents 5 and 6).
  • JP 2002-226740 A JP 49-131142 A JP 2006-123174 A JP 10-049647 A Japanese Patent No. 5565251 Japanese Patent No. 5569106
  • an object of the present invention is to provide a hologram image forming medium having an additional security function that can be determined by a simple technique, and an image display medium.
  • a hologram image forming medium for solving the above problems includes a base material, and a transfer layer laminated on the base material, the transfer layer having at least a release layer, an OVD layer, and an adhesive layer.
  • the OVD layer has a fine concavo-convex structure portion including a diffraction grating, and at least one of a spatial frequency and a grating angle in the diffraction grating is different between the fine concavo-convex structure portions. Good.
  • the adhesive layer may include the luminescent fine particles.
  • An image display medium for solving the above problems includes a hologram image formed using the hologram image forming medium.
  • An image display medium for solving the above problems is an image display medium including a hologram image formed using the hologram image forming medium.
  • the image display medium is an authentication image for authenticating an owner who owns the image display medium, and includes the authentication image formed by the luminescent fine particles, and has a maximum wavelength in light emission of the luminescent fine particles.
  • the diffraction grating is configured such that the wavelength of the diffracted light emitted from the diffraction grating is included in the visible region by the spatial frequency in the diffraction grating.
  • a hologram image forming medium having an additional security function that can be determined by a simple technique, and an image display medium.
  • the image display medium is formed by a process of transferring a hologram image forming medium and ink ribbons of four colors YMCK to a base material.
  • the image display medium is formed by a process of transferring a hologram image forming medium and ink ribbons of four colors YMCK to an intermediate foil and a process of transferring the intermediate foil onto a transfer target.
  • other media and processes may be used as necessary to form image information consisting of four colors of YMCK.
  • FIG. 1 is a cross-sectional view showing a configuration example of a hologram image forming medium.
  • the hologram image forming medium 200 includes an OVD layer including a fine concavo-convex structure pattern for forming a hologram image.
  • the backcoat layer 202 is positioned on one side of the substrate 201, and the release layer 203, the OVD layer 204, the reflective layer 205, and the adhesive layer are provided on the opposite side. 206 are stacked in this order.
  • the adhesive layer 206 includes luminescent fine particles 207. Since the hologram image forming medium 200 includes the back coat layer 202, it is possible to reduce problems such as sticking during printing by the thermal head.
  • the release layer 203, the OVD layer 204, the reflective layer 205, and the adhesive layer 206 constitute an example of a transfer layer.
  • the hologram image is a portion of either the intermediate foil that is the adherend surface or the transferred object that is the final form when a heat source such as a thermal head is brought into contact with the backcoat layer 202 of the hologram image forming medium 200.
  • the image is printed by thermal transfer to a hologram image forming unit described later. That is, the hologram image forming medium 200 is peelable from the base material 201 at a high temperature, and the foil sharpness for transferring only the vicinity of a portion of the hologram image forming medium 200 heated to a predetermined temperature or more.
  • adhesion to the adherend surface and heat resistance that does not impair image quality due to heating during printing are required.
  • the constituent material of each layer can be appropriately selected so as to satisfy each function.
  • the back coat layer 202 is a layer that is in close contact with a heat source such as a thermal head, and is mainly required to have heat resistance and slipperiness.
  • a material for forming the back coat layer 202 an acrylic resin, a urethane resin, an acrylic silicone copolymer, and a urethane silicone copolymer, or a known material in which silicone oil, wax, fats and oils, fine particles, and the like are added to these materials are used. A thing can be selected suitably.
  • a synthetic resin such as a polyester resin, a polyolefin resin, a polystyrene resin, a methacrylic resin, a polycarbonate resin, a vinyl chloride resin, a cycloolefin polymer, or a composite thereof is used.
  • a base material having a layer on which at least one surface of the base material 201 is subjected to a surface treatment such as an easy-adhesion layer can be used.
  • the release layer 203 is a part mainly related to peelability from the base material 201.
  • the forming material of the release layer 203 includes acrylic resin, epoxy resin, butyral resin, epoxy acrylate resin, urethane acrylate resin, and the like. Can be used alone or as a mixture. Note that the formation material of the separation layer 203 is not limited to these. Furthermore, by adding a polyester resin, wax, or the like to these resins, the composition of the material for forming the release layer 203 can be selected as appropriate so that a desired release force can be obtained. However, since the release layer 203 needs to be transparent, the light release rate of the formed release layer 203 is desirably 70% or more.
  • a known resin that is cured by active rays such as heat and ultraviolet rays, and an initiator can be appropriately selected.
  • the thermosetting resin urethane resins composed of various polyol resins and various isocyanates can be used.
  • the ultraviolet curable resin a known resin containing an acrylic polymer, an acrylic monomer, and a photoinitiator can be used.
  • the OVD layer 204 Since an arbitrary pattern for obtaining diffracted light is formed on the surface layer of the OVD layer 204, the OVD layer 204 is used in the production process of the hologram image forming medium 200 and the use environment after the transfer or after the transfer. Therefore, it is required to suppress a change in the shape of the pattern. According to the above-described forming material, it is possible to provide the OVD layer 204 with a certain level of resistance enough to suppress a change in the shape of the pattern.
  • the surface layer pattern of the OVD layer 204 includes, for example, a color screen having different patterns for emitting R, G, and B diffracted light, and positional information of the hologram image forming medium 200 during thermal transfer.
  • the sensor mark unit 204S for reading is configured.
  • Each color screen has spatial frequencies corresponding to the three primary colors R (red), G (green), and B (blue).
  • the surface layer pattern of the OVD layer 204 includes an R area 204R, a G area 204G, and a B area 204B.
  • the R area 204R includes a diffraction grating having a spatial frequency for emitting red diffracted light
  • the G area 204G includes a diffraction grating having a spatial frequency for emitting green diffracted light
  • the B area 204B includes A diffraction grating having a spatial frequency for emitting blue diffracted light is included.
  • Each of the R area 204R, the G area 204G, and the B area 204B is an example of a fine concavo-convex structure portion.
  • the spatial frequency of each diffraction grating that emits diffracted light having colors such as R, G, and B, which are surface layer patterns, is determined by the wavelength of the required color, the angle of the irradiated light, and the viewing zone. .
  • the wavelength of R light is defined as 620 nm
  • the wavelength of G light is defined as 540 nm
  • the wavelength of B light is defined as 460 nm.
  • the normal direction of the surface of the OVD layer 204 that is, the normal direction of the two-dimensional plane in which the OVD layer 204 spreads is set as the irradiation direction
  • the direction in which the angle is formed is set as the irradiation direction.
  • the surface layer pattern of the OVD layer 204 is not limited to these.
  • the diffraction grating has a configuration in which concave portions and convex portions are alternately arranged.
  • an angle formed by one reference direction and a direction in which the concave portions and the convex portions extend is a grating angle.
  • the surface layer pattern of the OVD layer 204 may include a plurality of areas including diffraction gratings having different grating angles.
  • the surface layer pattern of the OVD layer 204 may include a plurality of areas in which both the spatial frequency and the grating angle of the diffraction grating are different from each other. In these cases, each area is an example of a fine concavo-convex structure portion.
  • the hologram image forming medium 200 includes a reflective layer 205 in order to give reflectivity to the hologram image and increase the hologram effect.
  • a transparent thin film layer can be used in addition to the metal thin film layer.
  • the transparent thin film layer is preferably formed of a material having a refractive index different from that of the OVD layer 204, and a material having a high refractive index such as zinc sulfide or titanium dioxide is appropriately selected as a material for forming the transparent thin film layer. can do.
  • the adhesive layer 206 has a role of an adhesive to the adherend surface, which is a heat transfer partner, that is, a transfer destination.
  • adhesion to the release layer 203 of the hologram image forming medium 200 is required after transfer, and at the same time, the adhesion to the reflective layer 205 is also provided. There is a need.
  • acrylic resin, epoxy resin, urethane resin, polyester resin, vinyl chloride-vinyl acetate copolymer, and chlorinated PP are used as the material for forming the adhesive layer 206 in accordance with desired adhesion and thermophysical properties. It can be used as a single or plural mixture as appropriate.
  • the fine particles include, for example, organic particles composed of styrene resin, acrylic resin, silicone resin, Teflon (registered trademark) resin, urea resin, and formaldehyde condensate, glass beads, silica, alumina, Inorganic fine particles made of calcium carbonate, metal oxide, or the like, or a pigment pigment having absorption at a specific wavelength of bubbles or visible light, or luminescent fine particles 207 can be used. It is also possible to use a plurality of types of fine particles in combination.
  • the surface of the adhesive layer 206 has irregularities by adding fine particles. Although the anti-blocking performance is improved by the unevenness, there is a concern that the adhesion to the adherend surface may be lowered. Therefore, it is preferable to design the material by appropriately selecting the resin and fine particles described above according to the desired performance. .
  • examples of the material for forming the luminescent fine particles 207 include known materials such as inorganic fluorescent pigments, organic fluorescent pigments, up-conversion fluorescent pigments, and phosphorescent pigments.
  • the luminescent fine particles 207 have an excitation spectrum peak in the wavelength region from the wavelength of infrared light to the wavelength of ultraviolet light, and emit light having a maximum wavelength in light emission in a wavelength region different from the peak wavelength of the excitation spectrum.
  • the light emitting fine particles may be used, and the material for forming the light emitting fine particles 207 is not limited to the materials described above. That is, the maximum wavelength in light emission of the luminescent fine particles 207 may be different from the peak wavelength of the excitation spectrum.
  • the luminescent fine particles 207 By using the luminescent fine particles 207, it is invisible under normal use, that is, invisible in the state where no excitation light is irradiated, and forms a luminescent image that can be confirmed when irradiated with the excitation light.
  • the second authenticity determination image can be applied to the hologram image forming medium 200 without impairing the visual effect of the hologram image. Therefore, it is desirable that the wavelength region including the peak wavelength in the excitation spectrum of the luminescent fine particles 207 is other than the visible region. Furthermore, considering the light resistance load on the final image display medium, the peak wavelength in the excitation spectrum of the luminescent fine particles 207 is preferably included in the infrared wavelength region or the near ultraviolet wavelength region.
  • the hologram image forming medium 200 forms an image with the luminescent fine particles 207 similar to the hologram image transferred to the transferred material on the transferred material. be able to. Thereby, in addition to the authenticity determination under normal illumination by the hologram image, the image by the luminescent fine particles 207 can be observed by illuminating the transferred material with ultraviolet light or infrared light. With the image by 207, double authentication can be made.
  • the luminescent fine particles 207 may partially have a high concentration portion and a low concentration portion. Due to the level of the concentration, a forgery prevention pattern such as a colored pattern made of a fine geometric pattern can be further imparted to the transfer target. Thereby, the forgery prevention property of the image by the luminescent fine particles 207 can be further improved.
  • the luminescent fine particles 207 having the maximum light emission wavelength in the infrared wavelength region are used as the luminescent fine particles 207, it is possible to easily detect an image for authenticity determination emitted by a light receiving element such as a CCD.
  • a light receiving element such as a CCD.
  • visual judgment is extremely difficult. For this reason, it is more difficult for a person who intends to attempt forgery to recognize the existence of the image for authenticity determination, and the forgery resistance of the transferred object having the image for authenticity determination can be improved.
  • the luminescent fine particles having a maximum wavelength in light emission in the visible light wavelength region are used as the luminescent fine particles 207
  • an image of the luminescent fine particles 207 is obtained by illuminating with ultraviolet light or infrared light. Since it can be observed visually, the image for authenticity determination can be detected by a simple method.
  • the luminescent fine particles 207 having the maximum wavelength for light emission in the infrared wavelength region and the luminescent fine particles 207 having the maximum wavelength for light emission in the wavelength region of visible light can be used alone, respectively, It is also possible to use both the luminescent fine particles 207 in the wavelength region and the luminescent fine particles 207 having the maximum wavelength in light emission in the visible light wavelength region. As described above, when two or more kinds of luminescent fine particles 207 having different maximum wavelengths in light emission are used, since it is possible to determine the authenticity at different wavelengths, the effect of preventing forgery by the image for determining the authenticity can be further enhanced. it can.
  • a light source such as an LED, a laser, and various lamps as irradiation light having an excitation spectrum
  • a light receiving element provided with a switchable optical filter or the like as a detection device to detect
  • authenticity determination can be performed. That is, by using a detection device including a light receiving element having an optical filter capable of switching the wavelength of received light between the infrared wavelength region and the visible wavelength region, authentication in the infrared wavelength region can be performed.
  • the authenticity determination in the visible light wavelength region can be performed by the detection device.
  • the optical filter transmits light having a wavelength emitted by the luminescent fine particles 207, and blocks disturbance light and, if necessary, excitation light.
  • a filter such as a long-pass filter that transmits light having a wavelength longer than an arbitrary wavelength and blocks light having a wavelength shorter than the arbitrary wavelength, and a band-pass filter can be used.
  • the percentage of the weight addition amount of the luminescent fine particles 207 with respect to the total weight of the adhesive layer 206 is Wb
  • 2% ⁇ Wb ⁇ 50% is preferable
  • 5% ⁇ Wb ⁇ 30% is more preferable. This is because the blocking resistance starts to decrease when Wb ⁇ 5%, and the blocking resistance and foil sharpness significantly decrease when Wb ⁇ 2%.
  • Wb> 50% the adhesion to the adherend surface and the film strength are remarkably lowered, causing cohesive failure inside the adhesive layer 206 during transfer.
  • one or more kinds of fine particles other than the light-emitting fine particles 207 are appropriately selected to form the light-emitting fine particles 207. Can be used together.
  • the hologram image forming medium 200 by adding the light-emitting fine particles 207 to the adhesive layer 206, it is possible to form the adhesive layer 206 having favorable foil sharpness, blocking resistance, adhesion to the adherend surface, and the like. Moreover, according to the hologram image forming medium 200 having the adhesive layer 206 to which the luminescent fine particles 207 are added, the light emission that is invisible under normal use and can be confirmed when irradiated with arbitrary excitation light. An image can be applied to a transfer medium, and an individual authentication medium or a preference medium with a very high visual effect can be formed.
  • the luminescent fine particles 207 are added to the adhesive layer 206 has been described above as an example.
  • the luminescent fine particles 207 may be added to other layers of the hologram image forming medium 200, for example, a release layer.
  • the luminescent fine particles 207 are added to the OVD layer 204, the structure pattern forming the hologram image is damaged by the surface unevenness due to the luminescent fine particles 207. It is necessary to add.
  • thermal transfer is performed compared to a method of transferring a hologram image directly from the hologram image forming medium 200 on the transfer target.
  • a method of forming a hologram image on the transfer medium using an intermediate foil that sometimes follows the behavior of the hologram image forming medium 200 is more preferable.
  • 3 to 5 are diagrams showing a cross-sectional structure related to hologram image formation when an intermediate foil is used.
  • FIG. 3 and 4 are diagrams showing a cross-sectional structure when the hologram image forming medium 200 is thermally transferred to the adherend surface.
  • the heat source 400 is brought into contact with the back coat layer 202 of the hologram image forming medium 200 and is pressed using a roll 401, so that the vicinity where the heat source 400 is applied adheres to the image receiving layer 301 and at the same time the release layer 203 and the substrate By peeling off the peeling layer 203 at the interface with 201, a hologram image can be formed on the image receiving layer 301.
  • an intermediate foil 300 including an image receiving layer 301 and a substrate 302 is prepared.
  • the heat source 400 is brought into contact with the back coat layer 202 of the hologram image forming medium 200 to thereby form a base of the intermediate foil 300.
  • the hologram image forming medium 200 and the intermediate foil 300 are pressure-bonded by a roll 401 brought into contact with the material 302.
  • a portion of the adhesive layer 206 that overlaps the heat generation source 400 in the thickness direction of the hologram image forming medium 200 adheres to the image receiving layer 301.
  • the hologram print layer 208 including the hologram image can be formed on the image receiving layer 301 by peeling the release layer 203 at the interface between the release layer 203 and the substrate 201.
  • FIG. 5 is a diagram showing a cross-sectional structure in an example in which a hologram image is formed on the transfer object 500.
  • the intermediate foil 300 is finally heat-pressed to the transfer object 500, thereby finally An image display medium can be obtained.
  • FIG. 5A shows a configuration in which after forming a hologram image on the intermediate foil 300, the substrate 302 of the intermediate foil 300 is thermocompression bonded to the transfer object 500 to form an image display medium.
  • FIG. 5B shows a configuration in which a hologram image is formed on the intermediate foil 300, then thermally bonded to the transfer target 500, and then the substrate 302 of the intermediate foil 300 is peeled off. .
  • the intermediate foil 300 has a structure in which an image receiving layer 301 made of resin layers of at least two or more different materials is formed on a base material 302. That is, the image receiving layer 301 is formed from a mixture in which two or more kinds of resins are mixed.
  • a material for forming the image receiving layer 301 a known thermoplastic resin such as an acrylic resin, a polyester resin, and an epoxy resin can be used in appropriate combination.
  • the transferred object 500 includes a base material, and the material for forming the base material can be appropriately selected from paper, resin, synthetic paper, and the like according to the form used by the image display medium. Further, a predetermined surface treatment can be applied to the surface of the base material of the transfer object 500 before applying the hologram image in accordance with the physical properties desired to be imparted to the base material. Specifically, the surface treatment includes, for example, a treatment for forming an anchor layer for improving adhesion with a transfer image.
  • it is a layer having an antistatic function, a peelable protective layer, a layer that absorbs a wavelength in a region not including the excitation wavelength of the luminescent fine particles 207 and the maximum wavelength in light emission, and has a function of protecting a printed matter.
  • You may provide the intermediate foil 300 with the layer which has.
  • FIG. 6 is a diagram illustrating a planar structure in an example of the image display medium 602.
  • the hologram print layer including the hologram image in the hologram image printing unit 600 in the vicinity of the photographic image display unit 601 in the transferred object 500.
  • a visible image display medium 602 for authentication can be formed.
  • the photographic image is falsified by visually observing the images of the photographic image display unit 601 and the hologram image printing unit 600 installed in the vicinity thereof. It can be easily determined whether or not there is.
  • the photographic image and the hologram image are preferably the same image.
  • the light emitting fine particles 207 included in the hologram print layer 208 are irradiated with excitation light using an LED or an ultraviolet lamp having a peak wavelength of the excitation spectrum, and the hologram print layer 208 of the hologram image printing unit 600 emits light.
  • the authenticity of the image display medium 602 can be determined. That is, the image display medium 602 can exhibit a further anti-counterfeit effect by the luminescent fine particles 207 included in the adhesive layer 206.
  • the image display medium 602 is an authentication image for authenticating the owner who owns the image display medium 602, and may include an authentication image formed by the luminescent fine particles 207.
  • the authentication image formed by the luminescent particles 207 may be an image of the owner's face, an image displaying the owner's fingerprint, and an image displaying the name of the owner. That is, the authentication image may be an image including information belonging to the owner of the image display medium 602.
  • the luminescent fine particles 207 are preferably luminescent fine particles in which the maximum wavelength in light emission is included in the infrared wavelength region.
  • the hologram printing layer 208 is formed on the hologram image printing unit 600, and the hologram printing layer 208 includes the OVD layer 204.
  • the diffraction grating included in the OVD layer 204 is preferably configured so that the wavelength of the diffracted light emitted from the diffraction grating is included in the visible region depending on the spatial frequency in the diffraction grating.
  • the diffraction grating may be a diffraction grating included in the above-described R area 204R, G area 204G, and B area 204B.
  • the CCD when detecting light emitted from the image display medium 602 using a CCD that detects light included in the infrared wavelength region, the CCD detects light emitted from the luminescent fine particles 207. On the other hand, the diffracted light emitted from the diffraction grating is not detected.
  • the detection of the authentication image formed by the light emitting fine particles 207 by the CCD is prevented from being hindered by the diffracted light emitted from the diffraction grating. Therefore, according to the image display medium 602, reading of the authentication image formed on the hologram image printing unit 600 and authentication of the owner using the authentication image are hindered by the image formed by the diffracted light. While suppressing this, it is possible to display a hologram image and an image of the luminescent fine particles 207.
  • a surface treatment such as a treatment for forming an anchor layer on the outermost surface or a corona treatment may be performed.
  • DESCRIPTION OF SYMBOLS 200 ... Hologram image formation medium 201 ... Base material 202 ... Backcoat layer 203 ... Release layer 204 ... OVD layer 204R ... R area 204G ... G area 204B ... B area 204S ... Sensor mark part 205 ... Reflective layer 206 ... Adhesive layer 207 ... Luminescent fine particles 208 ... Hologram printing layer 300 ... Intermediate foil 301 ... Image receiving layer 302 ... Base material 400 ... Heat source 401 ... Roll 500 ... Transfer object 600 ... Hologram image printing part 601 ... Photo image display part 602 ... Image display medium

Abstract

This medium for forming a hologram image is provided with a base material and a transfer layer which is layered on top of the base material and which has at least a peeling layer, an OVD layer, and an adhesive layer. The layers other than the OVD layer in the transfer layer contain luminescent microparticles, the luminescent microparticles have a peak wavelength of an excitation spectrum within a wavelength range from infrared wavelengths to ultraviolet wavelengths, and the maximum wavelength in light emission by the luminescent microparticles is different from the peak wavelength of the excitation spectrum.

Description

ホログラム画像形成用媒体及びそれを用いた画像表示媒体Hologram image forming medium and image display medium using the same
　本発明は、ホログラム画像形成用媒体、及び、それを用いた画像表示媒体に関わるものである。 The present invention relates to a hologram image forming medium and an image display medium using the same.
　パスポート及びＩＤ（Identification）カードなどの個人認証媒体の多くは、目視による個人認証を可能とするために、顔画像を有している。例えば、パスポートでは、従来、顔画像を焼き付けた印画紙が冊子体に貼り付けられていた。しかしながら、そのようなパスポートは、印画紙の貼り替えによって改竄される恐れがある。 Many personal authentication media such as passports and ID (Identification) cards have face 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 a passport may be tampered with by changing the photographic paper.
　このような理由で、近年では、顔画像の情報をデジタル化し、これを冊子上に再現する方法が採られている。この画像再現方法として、昇華型や顔料を分散させた熱溶融型の転写リボンによる感熱転写記録法、あるいは、電子写真法などが検討されている。 For these reasons, recently, a method of digitizing facial image information and reproducing it on a booklet has been adopted. As this image reproduction method, a thermal transfer recording method using a heat melting type transfer ribbon in which a sublimation type or a pigment is dispersed, or an electrophotographic method has been studied.
　パスポートへの画像再現方法として、上記方法以外に、インクジェットプリンターによる記録法（例えば、特許文献１参照）、炭酸ガスもしくはＹＡＧレーザーと感熱発色剤とを使用したレーザー印字記録法（例えば、特許文献２参照）などが挙げられる。さらには、パスポートへの画像再現方法として、基材中に存在する炭素（Ｃ）を利用して、基材の深さ方向にも印字記録するレーザーエングレービング印字記録法（例えば、特許文献３参照）などが挙げられる。 As an image reproduction method for a passport, in addition to the above method, a recording method using an ink jet printer (for example, see Patent Document 1), a laser printing recording method using a carbon dioxide gas or a YAG laser and a thermal color former (for example, Patent Document 2). For example). Furthermore, as a method for reproducing an image on a passport, a laser engraving printing recording method (for example, Patent Document 3) in which carbon (C) existing in the substrate is used for printing recording in the depth direction of the substrate. For example).
　さらに、この種の個人認証データを含む画像表示体として、画像データに基づいて形成された画像パターンをポリ塩化ビニルなどから形成されたカード基材上に備えたものなどが知られている。あるいは、画像表示体として、上記画像パターンに加えて、ＯＶＤ（Optical Variable Device）画像を表示するものが知られている。ＯＶＤ画像は、ホログラム、回折格子、あるいは、多層干渉を用いた光学的薄膜などを用いて表示される画像である。なお、光学的薄膜によれば、光学設計によりカラーシフトなどの効果が得られる。 Further, as an image display body including this kind of personal authentication data, an image display body provided with an image pattern formed on the basis of image data on a card substrate made of polyvinyl chloride or the like is known. Alternatively, an image display that displays an OVD (Optical Variable Device) image in addition to the image pattern is known. The OVD image is an image displayed using a hologram, a diffraction grating, an optical thin film using multilayer interference, or the like. According to the optical thin film, an effect such as color shift can be obtained by optical design.
　これらホログラムや回折格子を用いるＯＶＤ技術は、高度な製造技術を要し、複製の難しいことから有効な偽造防止手段としてクレジットカード、ＩＤカード、及び、プリペイドカードなどのカード類に利用されてきた。さらには、その装飾性の高さから、包装材、書籍、パンフレット、及び、ＰＯＰなどへの利用も少なくない。これらＯＶＤを物品に貼着するための手段として、従来から、転写箔を用いて転写形成する方法が採られている。 These OVD techniques using holograms and diffraction gratings require advanced manufacturing techniques and are difficult to duplicate, so they have been used for cards such as credit cards, ID cards, and prepaid cards as effective forgery prevention means. Furthermore, due to its high decorativeness, it is often used for packaging materials, books, pamphlets, and POPs. As a means for sticking these OVDs to articles, a method of transferring and forming using a transfer foil has been conventionally employed.
　このようなＯＶＤ転写箔は偽造防止効果としては、十分な機能を果たすが、パスポートの様に顔写真などの画像形成後に該画像上にＯＶＤ転写層を熱的に転写して形成している。そのため、偽造技術の発達した現在では、何らかの手法により転写層を一旦取り去り、画像データなどの改竄を行った後に改めてＯＶＤ転写層を載せるといったことが行われる可能性がある。 Such an OVD transfer foil performs a sufficient function as an anti-counterfeiting effect, but is formed by thermally transferring an OVD transfer layer on the image after forming an image such as a face photograph like a passport. Therefore, at the present time when the forgery technology has been developed, there is a possibility that the transfer layer is temporarily removed by some method, and after the image data or the like is altered, the OVD transfer layer is placed again.
　さらに、盗難されたパスポートなどの認証媒体の写真と顔の形状や雰囲気が似ている人を選定して、ＯＶＤ転写層を印字写真の顔の上から張ることで、画像データの改竄が行われる可能性もある。 Furthermore, by selecting a person whose face shape and atmosphere is similar to the photo of an authentication medium such as a stolen passport, the OVD transfer layer is stretched over the face of the printed photo, so that the image data is falsified. There is a possibility.
　また、顔写真などの画像情報を形成する手段としての熱転写方式、インクジェット方式あるいは、電子写真方式などのプリンタは、昨今では一般に広く普及している状況を考慮すると、画像形成部を取り除いた後の領域に新たに画像を形成することは、必ずしも困難とは言い切れない。 Also, thermal transfer, ink jet, or electrophotographic printers as means for forming image information such as facial photographs have been widely used nowadays, after the image forming portion has been removed. It is not necessarily difficult to form a new image in a region.
　上記のような問題を解決すべく、顔写真などの個人を特定する情報を個人認証媒体に複数個付与する方法が考えられている。その一方法として、顔写真などの画像情報をホログラム又は回折格子などで形成するといった、ホログラムリボンを用いた直接熱転写方式が知られている（例えば、特許文献４参照）。これにより、カラー画像による顔写真などの改竄と同時にホログラム画像の改竄も行わなければ成らなくなるため、より改竄を困難にすることができる。この場合、ホログラム画像と有色インキ画像とを併用して用いることが考えられる（例えば、特許文献５、６参照）。 In order to solve the above problems, a method of giving a plurality of pieces of information for identifying an individual such as a face photograph to a personal authentication medium is considered. As one of the methods, a direct thermal transfer method using a hologram ribbon, in which image information such as a face photograph is formed by a hologram or a diffraction grating, is known (for example, see Patent Document 4). This makes it difficult to alter the hologram image unless the hologram image is altered at the same time as falsification of a face photograph using a color image. In this case, it is conceivable to use a hologram image and a colored ink image in combination (for example, see Patent Documents 5 and 6).
特開２００２－２２６７４０号公報JP 2002-226740 A 特開昭４９－１３１１４２号公報JP 49-131142 A 特開２００６－１２３１７４号公報JP 2006-123174 A 特開平１０－０４９６４７号公報JP 10-049647 A 特許第５５６５２５１号Japanese Patent No. 5565251 特許第５５６９１０６号Japanese Patent No. 5569106
　しかしながら、ホログラムリボンを用いたホログラム画像形成手段と通常の有色インキ画像との組み合わせでは、目視による真贋判定機能ならびに装飾性の付与を行うことはできるが、更なる偽造防止判定機能として簡易的な機器判定機能も求められている。そこで、本発明では、簡便な手法で判定可能な更なるセキュリティ機能を有するホログラム画像形成用媒体、及び、画像表示媒体を提供することを目的とする。 However, the combination of a hologram image forming means using a hologram ribbon and a normal colored ink image can provide a visual authenticity determination function and a decoration, but it is a simple device as a further anti-counterfeit determination function. A judgment function is also required. Therefore, an object of the present invention is to provide a hologram image forming medium having an additional security function that can be determined by a simple technique, and an image display medium.
　上記課題を解決するためのホログラム画像形成用媒体は、基材と、前記基材上に積層された転写層であって、少なくとも剥離層、ＯＶＤ層、接着層を有する前記転写層と、を備えるホログラム画像形成用媒体であって、前記転写層のうち、前記ＯＶＤ層以外のいずれかの層が発光性微粒子を含み、前記発光性微粒子が、赤外線の波長から紫外線の波長までの波長領域内に励起スペクトルのピーク波長を有し、かつ、前記発光性微粒子の発光における極大波長が、前記励起スペクトルのピーク波長と互いに異なる。 A hologram image forming medium for solving the above problems includes a base material, and a transfer layer laminated on the base material, the transfer layer having at least a release layer, an OVD layer, and an adhesive layer. A hologram image forming medium, wherein one of the transfer layers other than the OVD layer includes luminescent fine particles, and the luminescent fine particles are in a wavelength region from an infrared wavelength to an ultraviolet wavelength. It has a peak wavelength of the excitation spectrum, and the maximum wavelength in light emission of the luminescent fine particles is different from the peak wavelength of the excitation spectrum.
　上記ホログラム画像形成用媒体において、前記ＯＶＤ層が回折格子を含む微細凹凸構造部を有し、前記微細凹凸構造部の間において、前記回折格子における空間周波数及び格子角度の少なくとも一方が互いに異なってもよい。 In the hologram image forming medium, the OVD layer has a fine concavo-convex structure portion including a diffraction grating, and at least one of a spatial frequency and a grating angle in the diffraction grating is different between the fine concavo-convex structure portions. Good.
　上記ホログラム画像形成用媒体において、前記接着層が、前記発光性微粒子を含んでもよい。 In the hologram image forming medium, the adhesive layer may include the luminescent fine particles.
　上記課題を解決するための画像表示媒体は、上記ホログラム画像形成用媒体を用いて形成されたホログラム画像を含む。 An image display medium for solving the above problems includes a hologram image formed using the hologram image forming medium.
　上記課題を解決するための画像表示媒体は、上記ホログラム画像形成用媒体を用いて形成されたホログラム画像を含む画像表示媒体である。前記画像表示媒体は、前記画像表示媒体を所有する所有者を認証するための認証用画像であって、前記発光性微粒子が形成する前記認証用画像を含み、前記発光性微粒子の発光における極大波長が赤外線の波長領域に含まれ、前記回折格子は、前記回折格子における前記空間周波数によって前記回折格子の射出する回折光の波長が可視領域に含まれるように構成されている。 An image display medium for solving the above problems is an image display medium including a hologram image formed using the hologram image forming medium. The image display medium is an authentication image for authenticating an owner who owns the image display medium, and includes the authentication image formed by the luminescent fine particles, and has a maximum wavelength in light emission of the luminescent fine particles. Are included in the infrared wavelength region, and the diffraction grating is configured such that the wavelength of the diffracted light emitted from the diffraction grating is included in the visible region by the spatial frequency in the diffraction grating.
　本発明によれば、簡便な手法で判定可能な更なるセキュリティ機能を有するホログラム画像形成用媒体、及び、画像表示媒体を提供することができる。 According to the present invention, it is possible to provide a hologram image forming medium having an additional security function that can be determined by a simple technique, and an image display medium.
ホログラム画像形成用媒体の構成例を模式的に示す断面図である。It is sectional drawing which shows the structural example of the medium for hologram image formation typically. ホログラム画像形成用媒体が備えるＯＶＤ層の構成例を模式的に示す平面図である。It is a top view which shows typically the structural example of the OVD layer with which the medium for hologram image formation is provided. ホログラム画像形成用媒体を用いた、中間箔へのホログラム画像形成を模式的に示す断面図である。It is sectional drawing which shows typically the hologram image formation to intermediate | middle foil using the hologram image formation medium. ホログラム画像を形成した中間箔の例を模式的に示す断面図である。It is sectional drawing which shows typically the example of the intermediate foil in which the hologram image was formed. 中間箔を被転写体に貼り付けた状態の例を示す断面図である。It is sectional drawing which shows the example of the state which affixed intermediate foil on the to-be-transferred body. 中間箔の基材を剥がし、被転写体上にホログラム画像が形成された例を示す断面図である。It is sectional drawing which shows the example in which the base material of intermediate foil was peeled off and the hologram image was formed on the to-be-transferred body. ホログラム画像形成用媒体を用いてホログラム画像が形成された画像表示媒体の例を示す平面図である。It is a top view which shows the example of the image display medium in which the hologram image was formed using the hologram image formation medium.
　以下では、本発明の実施形態について添付図面を参照して説明する。各図面において、実施形態が異なる場合であっても、互いに同一の部材、または、互いに相当する部材には同一の符号を付し、共通する説明は省略する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, even when the embodiments are different, the same members or the members corresponding to each other are denoted by the same reference numerals, and the common description is omitted.
　画像表示媒体は、ホログラム画像形成用媒体とＹＭＣＫの４色からなるインクリボンとを基材に転写するプロセスにより形成されるものである。あるいは画像表示媒体は、ホログラム画像形成用媒体とＹＭＣＫの４色からなるインクリボンとを中間箔に転写するプロセスと、この中間箔を被転写体上に転写するプロセスとにより形成されるものである。なお、ＹＭＣＫの４色からなる画像情報の形成には、必要に応じて他の媒体およびプロセスを用いてもよい。 The image display medium is formed by a process of transferring a hologram image forming medium and ink ribbons of four colors YMCK to a base material. Alternatively, the image display medium is formed by a process of transferring a hologram image forming medium and ink ribbons of four colors YMCK to an intermediate foil and a process of transferring the intermediate foil onto a transfer target. . It should be noted that other media and processes may be used as necessary to form image information consisting of four colors of YMCK.
　以下、一実施形態について、図１から図６を参照しながら説明する。
　図１はホログラム画像形成用媒体の構成例を示した断面図である。 Hereinafter, an embodiment will be described with reference to FIGS. 1 to 6.
FIG. 1 is a cross-sectional view showing a configuration example of a hologram image forming medium.
　図１が示すように、ホログラム画像形成用媒体２００は、ホログラム画像を形成するための微細凹凸構造パターンを含むＯＶＤ層を備えている。具体的には、ホログラム画像形成用媒体２００において、基材２０１の片面にバックコート層２０２が位置し、その反対側の面に、剥離層２０３、ＯＶＤ層２０４、反射層２０５、及び、接着層２０６がこの順に積み重なっている。接着層２０６は、発光性微粒子２０７を含んでいる。ホログラム画像形成用媒体２００は、バックコート層２０２を備えるため、サーマルヘッドによる印字時のスティッキングなどの不具合を低減することができる。 As shown in FIG. 1, the hologram image forming medium 200 includes an OVD layer including a fine concavo-convex structure pattern for forming a hologram image. Specifically, in the hologram image forming medium 200, the backcoat layer 202 is positioned on one side of the substrate 201, and the release layer 203, the OVD layer 204, the reflective layer 205, and the adhesive layer are provided on the opposite side. 206 are stacked in this order. The adhesive layer 206 includes luminescent fine particles 207. Since the hologram image forming medium 200 includes the back coat layer 202, it is possible to reduce problems such as sticking during printing by the thermal head.
　ホログラム画像形成用媒体２００において、剥離層２０３、ＯＶＤ層２０４、反射層２０５、及び、接着層２０６が転写層の一例を構成している。 In the hologram image forming medium 200, the release layer 203, the OVD layer 204, the reflective layer 205, and the adhesive layer 206 constitute an example of a transfer layer.
　ホログラム画像は、サーマルヘッドなどの発熱源をホログラム画像形成用媒体２００のバックコート層２０２に接触させ、被着面である中間箔、あるいは、最終形態となる被転写体のいずれかの部位であって、後述するホログラム画像形成部に感熱転写されることで印画される。即ち、ホログラム画像形成用媒体２００には、高温下における基材２０１からの剥離性、ホログラム画像形成用媒体２００のうちで所定以上に加熱された箇所の近傍のみが転写されるための箔キレ性、被着面への密着性、及び、印画時の加熱により画質を損なわない耐熱性が必要である。ホログラム画像形成用媒体２００では、各機能を充たすべく各層の構成素材を適宜選択することができる。 The hologram image is a portion of either the intermediate foil that is the adherend surface or the transferred object that is the final form when a heat source such as a thermal head is brought into contact with the backcoat layer 202 of the hologram image forming medium 200. Thus, the image is printed by thermal transfer to a hologram image forming unit described later. That is, the hologram image forming medium 200 is peelable from the base material 201 at a high temperature, and the foil sharpness for transferring only the vicinity of a portion of the hologram image forming medium 200 heated to a predetermined temperature or more. In addition, adhesion to the adherend surface and heat resistance that does not impair image quality due to heating during printing are required. In the hologram image forming medium 200, the constituent material of each layer can be appropriately selected so as to satisfy each function.
　バックコート層２０２は、サーマルヘッドなどの熱源に密着する層であり、主に耐熱性や滑り性が求められる。バックコート層２０２の形成材料には、アクリル樹脂、ウレタン樹脂、アクリルシリコーン共重合体、及び、ウレタンシリコーン共重合体、あるいは、これらにシリコーンオイルやワックス、油脂、及び、微粒子などを添加した公知のものを適宜選択することができる。 The back coat layer 202 is a layer that is in close contact with a heat source such as a thermal head, and is mainly required to have heat resistance and slipperiness. As a material for forming the back coat layer 202, an acrylic resin, a urethane resin, an acrylic silicone copolymer, and a urethane silicone copolymer, or a known material in which silicone oil, wax, fats and oils, fine particles, and the like are added to these materials are used. A thing can be selected suitably.
　基材２０１の形成材料には、ポリエステル樹脂、ポリオレフィン樹脂、ポリスチレン樹脂、メタクリル樹脂、ポリカーボネート樹脂、塩化ビニル樹脂、及び、シクロオレフィンポリマーや、これらの複合体などの合成樹脂が用いられる。基材２０１には、基材２０１の少なくとも一方の面に易接着層のような表面処理が施された層を有するものも使用することができる。 As a forming material of the base material 201, a synthetic resin such as a polyester resin, a polyolefin resin, a polystyrene resin, a methacrylic resin, a polycarbonate resin, a vinyl chloride resin, a cycloolefin polymer, or a composite thereof is used. As the base material 201, a base material having a layer on which at least one surface of the base material 201 is subjected to a surface treatment such as an easy-adhesion layer can be used.
　剥離層２０３は、主に基材２０１からの剥離性などに関与する部分であり、剥離層２０３の形成材料には、アクリル樹脂、エポキシ樹脂、ブチラール樹脂、エポキシアクリレート樹脂、及び、ウレタンアクリレート樹脂などを単独あるいは混合物として用いることができる。なお、剥離層２０３の形成材料は、これらに限定されない。更に、これらの樹脂に、ポリエステル樹脂やワックスなどを添加することにより、所望の剥離力が得られるように適宜剥離層２０３の形成材料における組成を選定することができる。但し、剥離層２０３には透明性が必要となるため、形成された剥離層２０３の光透過率は７０％以上であることが望ましい。 The release layer 203 is a part mainly related to peelability from the base material 201. The forming material of the release layer 203 includes acrylic resin, epoxy resin, butyral resin, epoxy acrylate resin, urethane acrylate resin, and the like. Can be used alone or as a mixture. Note that the formation material of the separation layer 203 is not limited to these. Furthermore, by adding a polyester resin, wax, or the like to these resins, the composition of the material for forming the release layer 203 can be selected as appropriate so that a desired release force can be obtained. However, since the release layer 203 needs to be transparent, the light release rate of the formed release layer 203 is desirably 70% or more.
　ＯＶＤ層２０４の形成材料には、熱や紫外線などの活性線により硬化する公知の樹脂、及び、開始剤を適宜選択することができる。例えば、熱硬化性樹脂として、各種ポリオール樹脂と各種イソシアネート類からなるウレタン樹脂などを用いることができる。また、例えば、紫外線硬化樹脂として、アクリル系ポリマー、及び、アクリル系モノマーなどと光開始剤などとを含んだ公知のものを用いることができる。 As a material for forming the OVD layer 204, a known resin that is cured by active rays such as heat and ultraviolet rays, and an initiator can be appropriately selected. For example, as the thermosetting resin, urethane resins composed of various polyol resins and various isocyanates can be used. Further, for example, as the ultraviolet curable resin, a known resin containing an acrylic polymer, an acrylic monomer, and a photoinitiator can be used.
　ＯＶＤ層２０４の表層には、回折光を得るための任意のパターンが形成されるため、ＯＶＤ層２０４には、ホログラム画像形成用媒体２００の作成工程及び加熱転写時、あるいは転写後の使用環境下において、このパターンの形状が変化することを抑えることが求められる。上述した形成材料によれば、パターンの形状の変化を抑えられる程度の一定以上の耐性をＯＶＤ層２０４に付与することができる。 Since an arbitrary pattern for obtaining diffracted light is formed on the surface layer of the OVD layer 204, the OVD layer 204 is used in the production process of the hologram image forming medium 200 and the use environment after the transfer or after the transfer. Therefore, it is required to suppress a change in the shape of the pattern. According to the above-described forming material, it is possible to provide the OVD layer 204 with a certain level of resistance enough to suppress a change in the shape of the pattern.
　図２が示すように、ＯＶＤ層２０４の表層パターンは、例えばＲ、Ｇ、Ｂの回折光を射出するための異なるパターンを有する色画面と、熱転写時のホログラム画像形成用媒体２００の位置情報を読み取るためのセンサーマーク部２０４Ｓとから構成されている。色画面はそれぞれ３原色であるＲ（レッド）、Ｇ（グリーン）、Ｂ（ブルー）に対応した空間周波数を有している。 As shown in FIG. 2, the surface layer pattern of the OVD layer 204 includes, for example, a color screen having different patterns for emitting R, G, and B diffracted light, and positional information of the hologram image forming medium 200 during thermal transfer. The sensor mark unit 204S for reading is configured. Each color screen has spatial frequencies corresponding to the three primary colors R (red), G (green), and B (blue).
　すなわち、ＯＶＤ層２０４の表層パターンは、Ｒエリア２０４Ｒ、Ｇエリア２０４Ｇ、及び、Ｂエリア２０４Ｂを含んでいる。Ｒエリア２０４Ｒは赤色の回折光を射出するための空間周波数を有した回折格子を含み、Ｇエリア２０４Ｇは緑色の回折光を射出するための空間周波数を有した回折格子を含み、Ｂエリア２０４Ｂは青色の回折光を射出するための空間周波数を有した回折格子を含んでいる。Ｒエリア２０４Ｒ、Ｇエリア２０４Ｇ、及び、Ｂエリア２０４Ｂの各々は、微細凹凸構造部の一例である。 That is, the surface layer pattern of the OVD layer 204 includes an R area 204R, a G area 204G, and a B area 204B. The R area 204R includes a diffraction grating having a spatial frequency for emitting red diffracted light, the G area 204G includes a diffraction grating having a spatial frequency for emitting green diffracted light, and the B area 204B includes A diffraction grating having a spatial frequency for emitting blue diffracted light is included. Each of the R area 204R, the G area 204G, and the B area 204B is an example of a fine concavo-convex structure portion.
　ここで、表層パターンであるＲ、Ｇ、Ｂなどの色を有した回折光を射出する各回折格子の空間周波数は、必要とする色の波長、照射光の角度、及び視域によって決定される。 Here, the spatial frequency of each diffraction grating that emits diffracted light having colors such as R, G, and B, which are surface layer patterns, is determined by the wavelength of the required color, the angle of the irradiated light, and the viewing zone. .
　例えば、Ｒ、Ｇ、及び、Ｂのそれぞれの色において、Ｒ光の波長を６２０ｎｍに規定し、Ｇ光の波長を５４０ｎｍに規定し、Ｂ光の波長を４６０ｎｍに規定する。この場合に、ＯＶＤ層２０４が有する表面の法線方向、すなわちＯＶＤ層２０４が広がる２次元平面の法線方向と形成する角度が４５度である方向を照射方向に設定し、照射方向から白色の照射光を当て、法線方向にてＲ、Ｇ、および、Ｂの回折光を観察する場合には、各エリアに下記空間周波数を有するパターンを付与することができる。 For example, in each color of R, G, and B, the wavelength of R light is defined as 620 nm, the wavelength of G light is defined as 540 nm, and the wavelength of B light is defined as 460 nm. In this case, the normal direction of the surface of the OVD layer 204, that is, the normal direction of the two-dimensional plane in which the OVD layer 204 spreads is set as the irradiation direction, and the direction in which the angle is formed is set as the irradiation direction. When irradiating light and observing R, G, and B diffracted light in the normal direction, a pattern having the following spatial frequency can be given to each area.
　Ｒエリア２０４Ｒ　…　１１４０（ｌｉｎｅ／ｍｍ）
　Ｇエリア２０４Ｇ　…　１３１０（ｌｉｎｅ／ｍｍ）
　Ｂエリア２０４Ｂ　…　１５４０（ｌｉｎｅ／ｍｍ） R area 204R ... 1140 (line / mm)
G area 204G ... 1310 (line / mm)
B area 204B ... 1540 (line / mm)
　但し、ＯＶＤ層２０４の表層パターンはこれらに限定されるものではない。回折格子は、凹部と凸部とが交互に並ぶ構成であり、回折格子において、１つの基準方向と凹部及び凸部が延びる方向とが形成する角度が格子角度である。例えば、ＯＶＤ層２０４の表層パターンは、格子角度が互いに異なる回折格子を含む複数のエリアを含んでもよい。また例えば、ＯＶＤ層２０４の表層パターンは、回折格子の空間周波数と格子角度との両方が互いに異なる複数のエリアを含んでもよい。これらの場合において、各エリアが微細凹凸構造部の一例である。 However, the surface layer pattern of the OVD layer 204 is not limited to these. The diffraction grating has a configuration in which concave portions and convex portions are alternately arranged. In the diffraction grating, an angle formed by one reference direction and a direction in which the concave portions and the convex portions extend is a grating angle. For example, the surface layer pattern of the OVD layer 204 may include a plurality of areas including diffraction gratings having different grating angles. For example, the surface layer pattern of the OVD layer 204 may include a plurality of areas in which both the spatial frequency and the grating angle of the diffraction grating are different from each other. In these cases, each area is an example of a fine concavo-convex structure portion.
　ホログラム画像形成用媒体２００は、ホログラム画像に反射性を与え、ホログラム効果を増大させるために反射層２０５を備えている。反射層２０５としては、金属薄膜層の他に透明な薄膜層を用いることができる。透明な薄膜層は、ＯＶＤ層２０４とは屈折率が異なる物質から形成されることが望ましく、透明な薄膜層の形成材料には、例えば硫化亜鉛、二酸化チタンなどの屈折率の高い材料を適宜選択することができる。 The hologram image forming medium 200 includes a reflective layer 205 in order to give reflectivity to the hologram image and increase the hologram effect. As the reflective layer 205, a transparent thin film layer can be used in addition to the metal thin film layer. The transparent thin film layer is preferably formed of a material having a refractive index different from that of the OVD layer 204, and a material having a high refractive index such as zinc sulfide or titanium dioxide is appropriately selected as a material for forming the transparent thin film layer. can do.
　接着層２０６は、加熱転写の相手すなわち転写先である被着面への接着剤の役割を有している。ホログラム画像形成用媒体２００の転写に用いられる転写方式によっては、転写後においてホログラム画像形成用媒体２００の剥離層２０３との密着性が必要となると同時に、反射層２０５との密着性も合わせて有する必要がある。 The adhesive layer 206 has a role of an adhesive to the adherend surface, which is a heat transfer partner, that is, a transfer destination. Depending on the transfer method used for transferring the hologram image forming medium 200, adhesion to the release layer 203 of the hologram image forming medium 200 is required after transfer, and at the same time, the adhesion to the reflective layer 205 is also provided. There is a need.
　このため、接着層２０６の形成材料には、例えばアクリル樹脂、エポキシ樹脂、ウレタン樹脂、ポリエステル樹脂、塩化ビニル－酢酸ビニル共重合体、及び、塩素化ＰＰなどを所望の密着性や熱物性に合わせて単独ないし複数の混合物として適宜使用することができる。 For this reason, for example, acrylic resin, epoxy resin, urethane resin, polyester resin, vinyl chloride-vinyl acetate copolymer, and chlorinated PP are used as the material for forming the adhesive layer 206 in accordance with desired adhesion and thermophysical properties. It can be used as a single or plural mixture as appropriate.
　また、接着層２０６の箔キレ性や耐ブロッキング性能を向上させるため、任意の微粒子を接着層２０６の形成材料である上述した樹脂に添加することもできる。ここで、微粒子には、例えばスチレン系樹脂、アクリル系樹脂、シリコーン系樹脂、テフロン（登録商標）系樹脂、尿素樹脂、及び、ホルムアルデヒド縮合物などからなる有機系粒子、ガラスビーズ、シリカ、アルミナ、炭酸カルシウム、及び、金属酸化物などからなる無機系微粒子、または、気泡や可視光の特定の波長に吸収を有するような色素顔料、あるいは、発光性微粒子２０７などを用いることができる。また、複数種類の微粒子を併用することも可能である。 Moreover, in order to improve the foil sharpness and anti-blocking performance of the adhesive layer 206, arbitrary fine particles can be added to the above-described resin that is the material for forming the adhesive layer 206. Here, the fine particles include, for example, organic particles composed of styrene resin, acrylic resin, silicone resin, Teflon (registered trademark) resin, urea resin, and formaldehyde condensate, glass beads, silica, alumina, Inorganic fine particles made of calcium carbonate, metal oxide, or the like, or a pigment pigment having absorption at a specific wavelength of bubbles or visible light, or luminescent fine particles 207 can be used. It is also possible to use a plurality of types of fine particles in combination.
　一般的には、微粒子を添加することにより接着層２０６の表面が凹凸を有することとなる。この凹凸により耐ブロッキング性能は向上するが、被着面への密着性は低下する懸念があるため、所望の性能に合わせて上述した樹脂及び微粒子を適宜選定して、材料設計を行うことが好ましい。 Generally, the surface of the adhesive layer 206 has irregularities by adding fine particles. Although the anti-blocking performance is improved by the unevenness, there is a concern that the adhesion to the adherend surface may be lowered. Therefore, it is preferable to design the material by appropriately selecting the resin and fine particles described above according to the desired performance. .
　ここで、発光性微粒子２０７の形成材料として、無機蛍光顔料、有機蛍光顔料、アップコンバージョン蛍光顔料、及び、燐光顔料などの公知の材料を挙げることができる。なお、発光性微粒子２０７は、赤外線の波長から紫外線の波長までの波長領域内に励起スペクトルのピークを有し、この励起スペクトルのピーク波長と異なる波長領域に発光における極大波長を有する光を発光する発光性微粒子であればよく、発光性微粒子２０７の形成材料は上述した材料に限定されるものではない。すなわち、発光性微粒子２０７の発光における極大波長は、励起スペクトルのピーク波長と互いに異なっていればよい。 Here, examples of the material for forming the luminescent fine particles 207 include known materials such as inorganic fluorescent pigments, organic fluorescent pigments, up-conversion fluorescent pigments, and phosphorescent pigments. The luminescent fine particles 207 have an excitation spectrum peak in the wavelength region from the wavelength of infrared light to the wavelength of ultraviolet light, and emit light having a maximum wavelength in light emission in a wavelength region different from the peak wavelength of the excitation spectrum. The light emitting fine particles may be used, and the material for forming the light emitting fine particles 207 is not limited to the materials described above. That is, the maximum wavelength in light emission of the luminescent fine particles 207 may be different from the peak wavelength of the excitation spectrum.
　発光性微粒子２０７を用いて、通常の使用下では不可視であり、すなわち、励起光が照射されていない状態では不可視であり、励起光を照射した際に確認が可能な発光画像を形成することで、ホログラム画像の視覚効果を損なうことなく、第二の真贋判定用画像をホログラム画像形成用媒体２００に付与することができる。そのため、発光性微粒子２０７の励起スペクトルにおけるピーク波長の含まれる波長領域は、可視領域以外であることが望ましい。更には、最終的な画像表示媒体への耐光性負荷などを考慮すると、発光性微粒子２０７の励起スペクトルにおけるピーク波長は、赤外線の波長領域または近紫外線の波長領域に含まれることが望ましい。 By using the luminescent fine particles 207, it is invisible under normal use, that is, invisible in the state where no excitation light is irradiated, and forms a luminescent image that can be confirmed when irradiated with the excitation light. The second authenticity determination image can be applied to the hologram image forming medium 200 without impairing the visual effect of the hologram image. Therefore, it is desirable that the wavelength region including the peak wavelength in the excitation spectrum of the luminescent fine particles 207 is other than the visible region. Furthermore, considering the light resistance load on the final image display medium, the peak wavelength in the excitation spectrum of the luminescent fine particles 207 is preferably included in the infrared wavelength region or the near ultraviolet wavelength region.
　接着層２０６に添加する微粒子として発光性微粒子２０７を用いることで、ホログラム画像形成用媒体２００により、被転写体に転写されたホログラム画像と同様の発光性微粒子２０７による画像を被転写体に形成することができる。これにより、ホログラム画像による通常照明下での真贋判定に加えて、紫外光や赤外光で被転写体を照明することで、発光性微粒子２０７による画像を観察できるため、ホログラム画像と発光性微粒子２０７による画像とにより、二重の真贋判定が可能となる。 By using the luminescent fine particles 207 as the fine particles to be added to the adhesive layer 206, the hologram image forming medium 200 forms an image with the luminescent fine particles 207 similar to the hologram image transferred to the transferred material on the transferred material. be able to. Thereby, in addition to the authenticity determination under normal illumination by the hologram image, the image by the luminescent fine particles 207 can be observed by illuminating the transferred material with ultraviolet light or infrared light. With the image by 207, double authentication can be made.
　発光性微粒子２０７は、部分的に濃度の高い部分と濃度の低い部分を有していてもよい。この濃度の高低により、微細な幾何学模様からなる彩文柄などの偽造防止柄を被転写体にさらに付与することができる。これにより、発光性微粒子２０７による画像の偽造防止性をさらに向上させることができる。 The luminescent fine particles 207 may partially have a high concentration portion and a low concentration portion. Due to the level of the concentration, a forgery prevention pattern such as a colored pattern made of a fine geometric pattern can be further imparted to the transfer target. Thereby, the forgery prevention property of the image by the luminescent fine particles 207 can be further improved.
　但し、発光性微粒子２０７として、発光における極大波長を赤外線の波長領域に有するような発光性微粒子２０７を用いた場合には、ＣＣＤなどの受光素子により発光した真贋判定用画像を容易に検知することはできるが、目視による判定は極めて困難となる。このため、故意に偽造を試みようとする者にとっては、真贋判定用画像の存在を認識することがより困難となり、真贋判定用画像を有する被転写体の偽造耐性も向上させることができる。 However, when the luminescent fine particles 207 having the maximum light emission wavelength in the infrared wavelength region are used as the luminescent fine particles 207, it is possible to easily detect an image for authenticity determination emitted by a light receiving element such as a CCD. However, visual judgment is extremely difficult. For this reason, it is more difficult for a person who intends to attempt forgery to recognize the existence of the image for authenticity determination, and the forgery resistance of the transferred object having the image for authenticity determination can be improved.
　なお、発光性微粒子２０７として、発光における極大波長を可視光の波長領域に有するような発光性微粒子を用いた場合には、紫外線または赤外光で照明することで、発光性微粒子２０７による画像を目視で観察できるため、簡便な方法により真贋判定用画像を検知することができる。 In addition, when the luminescent fine particles having a maximum wavelength in light emission in the visible light wavelength region are used as the luminescent fine particles 207, an image of the luminescent fine particles 207 is obtained by illuminating with ultraviolet light or infrared light. Since it can be observed visually, the image for authenticity determination can be detected by a simple method.
　発光における極大波長を赤外線の波長領域に有する発光性微粒子２０７と、発光における極大波長を可視光の波長領域に有する発光性微粒子２０７とをそれぞれ単独で用いることもできるし、発光における極大波長を赤外線の波長領域に有する発光性微粒子２０７と、発光における極大波長を可視光の波長領域に有する発光性微粒子２０７との両方を用いることもできる。このように、発光における極大波長が互いに異なる２種類以上の発光性微粒子２０７を用いた場合には、異なった波長での真贋判定が行えるため、真贋判定用画像による偽造防止効果をさらに高めることができる。 The luminescent fine particles 207 having the maximum wavelength for light emission in the infrared wavelength region and the luminescent fine particles 207 having the maximum wavelength for light emission in the wavelength region of visible light can be used alone, respectively, It is also possible to use both the luminescent fine particles 207 in the wavelength region and the luminescent fine particles 207 having the maximum wavelength in light emission in the visible light wavelength region. As described above, when two or more kinds of luminescent fine particles 207 having different maximum wavelengths in light emission are used, since it is possible to determine the authenticity at different wavelengths, the effect of preventing forgery by the image for determining the authenticity can be further enhanced. it can.
　その真贋判定を実施する際には、励起スペクトルを有する照射光としてＬＥＤ、レーザー、及び、各種ランプなどの光源を用意するとともに、目視判定と機器判定を組み合わせることも可能であるが、発光光を検知する検出装置として、切り替え可能な光学フィルタを設けた受光素子などを用いることで、真贋判定が可能となる。すなわち、受光光の波長を赤外線の波長領域と可視光の波長領域との間で切り替えることが可能な光学フィルタを有した受光素子を備える検出装置を用いることで、赤外線の波長領域における真贋判定と、可視光の波長領域における真贋判定とを検出装置によって行うことができる。 When performing the authenticity determination, it is possible to prepare a light source such as an LED, a laser, and various lamps as irradiation light having an excitation spectrum, and to combine the visual determination with the apparatus determination. By using a light receiving element provided with a switchable optical filter or the like as a detection device to detect, authenticity determination can be performed. That is, by using a detection device including a light receiving element having an optical filter capable of switching the wavelength of received light between the infrared wavelength region and the visible wavelength region, authentication in the infrared wavelength region can be performed. The authenticity determination in the visible light wavelength region can be performed by the detection device.
　光学フィルタは、発光性微粒子２０７の発光する波長の光を透過し、外乱光と、必要に応じて励起用の照射光とを遮断するためのものである。光学フィルタには、任意の波長よりも長い波長の光を透過し、任意の波長よりも短い光を遮断するロングパスフィルタ、及び、バンドパスフィルタなどのフィルタを用いることができる。 The optical filter transmits light having a wavelength emitted by the luminescent fine particles 207, and blocks disturbance light and, if necessary, excitation light. As the optical filter, a filter such as a long-pass filter that transmits light having a wavelength longer than an arbitrary wavelength and blocks light having a wavelength shorter than the arbitrary wavelength, and a band-pass filter can be used.
　また、発光性微粒子２０７を接着層２０６に添加する構成の場合には、発光性微粒子２０７の平均粒径をｒ、接着層２０６の厚みをｈとすると、ｈ／５≦ｒ≦５ｈであることが望ましく、ｈ／３≦ｒ≦３ｈであることがより望ましい。これはｒ＜ｈ／３では表面凹凸が非常に微小となり耐ブロッキング性能が低下し始め、ｒ＜ｈ／５では耐ブロッキング性能及び箔キレ性が著しく損なわれるためである。また、ｒ＞３ｈでは耐ブロッキング性能及び箔キレ性は良好であるが、その表面凹凸の大きさから被着面への密着性が低下し始め、ｒ＞５ｈでは被着面への密着性及び転写性が著しく低下し、ホログラム画像形成が困難となるためである。 Further, in the case of the configuration in which the luminescent fine particles 207 are added to the adhesive layer 206, where the average particle diameter of the luminescent fine particles 207 is r and the thickness of the adhesive layer 206 is h, h / 5 ≦ r ≦ 5h. Is desirable, and h / 3 ≦ r ≦ 3h is more desirable. This is because when r <h / 3, the surface irregularities become very small and the anti-blocking performance starts to deteriorate, and when r <h / 5, the anti-blocking performance and foil sharpness are remarkably impaired. Further, when r> 3h, the anti-blocking performance and foil sharpness are good, but the adhesion to the adherend surface starts to decrease due to the size of the surface irregularities, and when r> 5h, the adherence to the adherend surface and This is because the transferability is remarkably deteriorated and it becomes difficult to form a hologram image.
　更に、接着層２０６の全体重量に対する発光性微粒子２０７の重量添加量における百分率をＷｂとすると２％≦Ｗｂ≦５０％であることが好ましく、５％≦Ｗｂ≦３０％であることがより好ましい。これは、Ｗｂ＜５％の場合はブロッキング耐性が低下し始め、Ｗｂ＜２％ではブロッキング耐性及び箔キレ性が著しく低下するためである。また、Ｗｂ＞５０％では被着面への密着性及び皮膜強度が著しく低下し、転写時に接着層２０６の内部で凝集破壊を引き起こすためである。 Furthermore, when the percentage of the weight addition amount of the luminescent fine particles 207 with respect to the total weight of the adhesive layer 206 is Wb, 2% ≦ Wb ≦ 50% is preferable, and 5% ≦ Wb ≦ 30% is more preferable. This is because the blocking resistance starts to decrease when Wb <5%, and the blocking resistance and foil sharpness significantly decrease when Wb <2%. Further, when Wb> 50%, the adhesion to the adherend surface and the film strength are remarkably lowered, causing cohesive failure inside the adhesive layer 206 during transfer.
　接着層２０６におけるブロッキング耐性及び箔キレ性などの各種特性の更なる向上のために、発光性微粒子２０７以外の微粒子のうち、１種あるいは２種以上の微粒子を適宜選択して発光性微粒子２０７と併用することができる。 In order to further improve various properties such as blocking resistance and foil sharpness in the adhesive layer 206, one or more kinds of fine particles other than the light-emitting fine particles 207 are appropriately selected to form the light-emitting fine particles 207. Can be used together.
　ホログラム画像形成用媒体２００において、発光性微粒子２０７を接着層２０６に添加することで、箔キレ性、耐ブロッキング性、被着面への密着性などが良好な接着層２０６を形成することができる。かつ、発光性微粒子２０７が添加された接着層２０６を有するホログラム画像形成用媒体２００によれば、通常の使用下では不可視であり、任意の励起光を照射した際に確認することが可能な発光画像を被転写体に付与することが可能となり、視覚効果の非常に高い個別認証媒体あるいは嗜好用媒体を形成することができる。 In the hologram image forming medium 200, by adding the light-emitting fine particles 207 to the adhesive layer 206, it is possible to form the adhesive layer 206 having favorable foil sharpness, blocking resistance, adhesion to the adherend surface, and the like. . Moreover, according to the hologram image forming medium 200 having the adhesive layer 206 to which the luminescent fine particles 207 are added, the light emission that is invisible under normal use and can be confirmed when irradiated with arbitrary excitation light. An image can be applied to a transfer medium, and an individual authentication medium or a preference medium with a very high visual effect can be formed.
　以上、発光性微粒子２０７を接着層２０６に添加する場合を例として説明したが、この発光性微粒子２０７は、ホログラム画像形成用媒体２００が有するその他の層、例えば剥離層に添加してもよい。なお、発光性微粒子２０７をＯＶＤ層２０４に添加した場合には、この発光性微粒子２０７による表面凹凸によってホログラム画像を形成する構造パターンが損傷されることから、ＯＶＤ層２０４を除くいずれかの層に添加する必要がある。 The case where the luminescent fine particles 207 are added to the adhesive layer 206 has been described above as an example. However, the luminescent fine particles 207 may be added to other layers of the hologram image forming medium 200, for example, a release layer. In addition, when the luminescent fine particles 207 are added to the OVD layer 204, the structure pattern forming the hologram image is damaged by the surface unevenness due to the luminescent fine particles 207. It is necessary to add.
　最終的な被転写体上にホログラム画像を形成する際には、画像形成性を考慮すると、被転写体上にホログラム画像形成用媒体２００から直にホログラム画像を転写する手法に比べて、感熱転写時にホログラム画像形成用媒体２００の挙動に追従するような中間箔を用いて被転写体上にホログラム画像を形成する手法がより好ましい。図３から図５は、中間箔を用いた場合のホログラム画像形成に関わる断面構造を示す図である。 When forming a hologram image on the final transfer target, in consideration of image formability, thermal transfer is performed compared to a method of transferring a hologram image directly from the hologram image forming medium 200 on the transfer target. A method of forming a hologram image on the transfer medium using an intermediate foil that sometimes follows the behavior of the hologram image forming medium 200 is more preferable. 3 to 5 are diagrams showing a cross-sectional structure related to hologram image formation when an intermediate foil is used.
　図３及び図４は、ホログラム画像形成用媒体２００を被着面へ感熱転写する際の断面構造を示す図である。ホログラム画像形成用媒体２００のバックコート層２０２に発熱源４００を接触させ、ロール４０１を用いて圧着することにより、発熱源４００を当てた近傍が受像層３０１に接着すると同時に剥離層２０３と基材２０１との界面にて剥離層２０３を剥離することで、受像層３０１上にホログラム画像を形成することが可能となる。 3 and 4 are diagrams showing a cross-sectional structure when the hologram image forming medium 200 is thermally transferred to the adherend surface. The heat source 400 is brought into contact with the back coat layer 202 of the hologram image forming medium 200 and is pressed using a roll 401, so that the vicinity where the heat source 400 is applied adheres to the image receiving layer 301 and at the same time the release layer 203 and the substrate By peeling off the peeling layer 203 at the interface with 201, a hologram image can be formed on the image receiving layer 301.
　すなわち、図３が示すように、受像層３０１と基材３０２とを備える中間箔３００を準備する。ホログラム画像形成用媒体２００の接着層２０６と、中間箔３００の受像層３０１とが対向する状態で、ホログラム画像形成用媒体２００のバックコート層２０２に発熱源４００を接触させ、中間箔３００の基材３０２に接触させたロール４０１によって、ホログラム画像形成用媒体２００と中間箔３００とを圧着する。これにより、接着層２０６のうち、ホログラム画像形成用媒体２００の厚さ方向において、発熱源４００と重なる部分が、受像層３０１に接着する。 That is, as shown in FIG. 3, an intermediate foil 300 including an image receiving layer 301 and a substrate 302 is prepared. With the adhesive layer 206 of the hologram image forming medium 200 and the image receiving layer 301 of the intermediate foil 300 facing each other, the heat source 400 is brought into contact with the back coat layer 202 of the hologram image forming medium 200 to thereby form a base of the intermediate foil 300. The hologram image forming medium 200 and the intermediate foil 300 are pressure-bonded by a roll 401 brought into contact with the material 302. As a result, a portion of the adhesive layer 206 that overlaps the heat generation source 400 in the thickness direction of the hologram image forming medium 200 adheres to the image receiving layer 301.
　図４が示すように、剥離層２０３と基材２０１との界面において剥離層２０３を剥離することによって、受像層３０１上にホログラム画像を含むホログラム印画層２０８を形成することができる。 As shown in FIG. 4, the hologram print layer 208 including the hologram image can be formed on the image receiving layer 301 by peeling the release layer 203 at the interface between the release layer 203 and the substrate 201.
　図５は、被転写体５００上にホログラム画像を形成した例における断面構造を示す図である。図３及び図４が示すように、受像層３０１にホログラム画像を形成した後、言い換えれば、ホログラム印画層２０８を形成した後、中間箔３００を被転写体５００に熱圧着することにより、最終的な画像表示媒体を得ることができる。 FIG. 5 is a diagram showing a cross-sectional structure in an example in which a hologram image is formed on the transfer object 500. As shown in FIGS. 3 and 4, after forming the hologram image on the image receiving layer 301, in other words, after forming the hologram printing layer 208, the intermediate foil 300 is finally heat-pressed to the transfer object 500, thereby finally An image display medium can be obtained.
　ここで、図５（Ａ）は、中間箔３００にホログラム画像を形成した後、中間箔３００の基材３０２ごと被転写体５００に熱圧着して画像表示媒体を形成している構成を示している。これに対して、図５（Ｂ）は、中間箔３００にホログラム画像を形成した後、被転写体５００に熱圧着し、その後に、中間箔３００の基材３０２を剥離した構成を示している。 Here, FIG. 5A shows a configuration in which after forming a hologram image on the intermediate foil 300, the substrate 302 of the intermediate foil 300 is thermocompression bonded to the transfer object 500 to form an image display medium. Yes. On the other hand, FIG. 5B shows a configuration in which a hologram image is formed on the intermediate foil 300, then thermally bonded to the transfer target 500, and then the substrate 302 of the intermediate foil 300 is peeled off. .
　中間箔３００は、基材３０２に少なくとも２種以上の異なる材質の樹脂層からなる受像層３０１が形成された構成である。すなわち、受像層３０１は、２種類以上の樹脂を混合した混合物から形成されている。受像層３０１の形成材料には、アクリル樹脂、ポリエステル樹脂、及び、エポキシ樹脂などの公知の熱可塑性樹脂を適宜組み合わせて使用することができる。 The intermediate foil 300 has a structure in which an image receiving layer 301 made of resin layers of at least two or more different materials is formed on a base material 302. That is, the image receiving layer 301 is formed from a mixture in which two or more kinds of resins are mixed. As a material for forming the image receiving layer 301, a known thermoplastic resin such as an acrylic resin, a polyester resin, and an epoxy resin can be used in appropriate combination.
　被転写体５００は基材を含み、基材の形成材料は、紙、樹脂、及び、合成紙などから、画像表示媒体の使用する形態に応じて適宜選択することが可能である。また、被転写体５００の基材における表面には、基材に付与したい物性に合わせて、ホログラム画像を貼着する前に、所定の表面処理を施すことが可能である。具体的には、表面処理には、転写画像との密着性を向上させるためのアンカー層を形成する処理などが挙げられる。 The transferred object 500 includes a base material, and the material for forming the base material can be appropriately selected from paper, resin, synthetic paper, and the like according to the form used by the image display medium. Further, a predetermined surface treatment can be applied to the surface of the base material of the transfer object 500 before applying the hologram image in accordance with the physical properties desired to be imparted to the base material. Specifically, the surface treatment includes, for example, a treatment for forming an anchor layer for improving adhesion with a transfer image.
　ここで、帯電防止機能を有する層、剥離性保護層、発光性微粒子２０７の励起波長並びに発光における極大波長を含まない領域の波長を吸収する層など層であって、印画物を保護する機能を有する層を中間箔３００に付与してもよい。 Here, it is a layer having an antistatic function, a peelable protective layer, a layer that absorbs a wavelength in a region not including the excitation wavelength of the luminescent fine particles 207 and the maximum wavelength in light emission, and has a function of protecting a printed matter. You may provide the intermediate foil 300 with the layer which has.
　図６は、画像表示媒体６０２の一例における平面構造を示す図である。
　図６が示すように、画像表示媒体６０２を個別認証用媒体として使用する際には、被転写体５００において、写真画像表示部６０１の近傍のホログラム画像印字部６００にホログラム画像を含むホログラム印画層２０８を形成することにより、視認可能な認証用の画像表示媒体６０２を形成することができる。 FIG. 6 is a diagram illustrating a planar structure in an example of the image display medium 602.
As shown in FIG. 6, when the image display medium 602 is used as the individual authentication medium, the hologram print layer including the hologram image in the hologram image printing unit 600 in the vicinity of the photographic image display unit 601 in the transferred object 500. By forming 208, a visible image display medium 602 for authentication can be formed.
　以上のようにして得られた画像表示媒体６０２において、写真画像表示部６０１とその近傍に設置されたホログラム画像印字部６００の画像を目視によって比較観察することにより、写真画像が改竄されたものであるかどうか容易に判別することができる。この場合には、例えば、写真画像とホログラム画像とが互いに同じ画像であることが好ましい。 In the image display medium 602 obtained as described above, the photographic image is falsified by visually observing the images of the photographic image display unit 601 and the hologram image printing unit 600 installed in the vicinity thereof. It can be easily determined whether or not there is. In this case, for example, the photographic image and the hologram image are preferably the same image.
　また、ホログラム印画層２０８が含む発光性微粒子２０７に対し、励起スペクトルのピーク波長を有するＬＥＤや紫外線ランプなどを用いて励起光を照射し、ホログラム画像印字部６００のホログラム印画層２０８が発光することを確認することで、画像表示媒体６０２の真贋を判定することができる。すなわち、画像表示媒体６０２は、接着層２０６が含む発光性微粒子２０７によって、更なる偽造防止効果を発揮することができる。 Further, the light emitting fine particles 207 included in the hologram print layer 208 are irradiated with excitation light using an LED or an ultraviolet lamp having a peak wavelength of the excitation spectrum, and the hologram print layer 208 of the hologram image printing unit 600 emits light. By confirming the above, the authenticity of the image display medium 602 can be determined. That is, the image display medium 602 can exhibit a further anti-counterfeit effect by the luminescent fine particles 207 included in the adhesive layer 206.
　画像表示媒体６０２は、画像表示媒体６０２を所有する所有者を認証するための認証用画像であって、発光性微粒子２０７が形成する認証用画像を含んでもよい。この場合には、発光性微粒子２０７の形成する認証用画像は、所有者の顔画像、所有者の指紋を表示する画像、及び、所有者の氏名などを表示する画像などであればよい。すなわち、認証用画像は、画像表示媒体６０２の所有者に属する情報を含む画像であればよい。発光性微粒子２０７は、発光における極大波長が赤外線の波長領域に含まれる発光性微粒子であることが好ましい。 The image display medium 602 is an authentication image for authenticating the owner who owns the image display medium 602, and may include an authentication image formed by the luminescent fine particles 207. In this case, the authentication image formed by the luminescent particles 207 may be an image of the owner's face, an image displaying the owner's fingerprint, and an image displaying the name of the owner. That is, the authentication image may be an image including information belonging to the owner of the image display medium 602. The luminescent fine particles 207 are preferably luminescent fine particles in which the maximum wavelength in light emission is included in the infrared wavelength region.
　ホログラム画像印字部６００には、上述したように、ホログラム印画層２０８が形成され、ホログラム印画層２０８は、ＯＶＤ層２０４を含んでいる。ＯＶＤ層２０４が含む回折格子は、回折格子における空間周波数によって、回折格子の射出する回折光の波長が可視領域に含まれるように構成されていることが好ましい。例えば、回折格子は、上述したＲエリア２０４Ｒ、Ｇエリア２０４Ｇ、及び、Ｂエリア２０４Ｂが含む回折格子であればよい。 As described above, the hologram printing layer 208 is formed on the hologram image printing unit 600, and the hologram printing layer 208 includes the OVD layer 204. The diffraction grating included in the OVD layer 204 is preferably configured so that the wavelength of the diffracted light emitted from the diffraction grating is included in the visible region depending on the spatial frequency in the diffraction grating. For example, the diffraction grating may be a diffraction grating included in the above-described R area 204R, G area 204G, and B area 204B.
　こうした構成によれば、例えば、赤外線の波長領域に含まれる光を検出するＣＣＤを用いて画像表示媒体６０２から出る光を検知したときに、ＣＣＤは、発光性微粒子２０７の発光する光を検知する一方で、回折格子が射出する回折光を検知しない。 According to such a configuration, for example, when detecting light emitted from the image display medium 602 using a CCD that detects light included in the infrared wavelength region, the CCD detects light emitted from the luminescent fine particles 207. On the other hand, the diffracted light emitted from the diffraction grating is not detected.
　そのため、ＣＣＤが発光性微粒子２０７の形成する認証用画像を検知することが、回折格子の射出する回折光によって妨げられることが抑えられる。それゆえに、画像表示媒体６０２によれば、ホログラム画像印字部６００に形成された認証用画像の読み取りと、認証用画像を用いた所有者の認証とが、回折光によって形成される像によって妨げられることを抑えつつ、ホログラム画像と発光性微粒子２０７による画像とを表示することができる。 Therefore, the detection of the authentication image formed by the light emitting fine particles 207 by the CCD is prevented from being hindered by the diffracted light emitted from the diffraction grating. Therefore, according to the image display medium 602, reading of the authentication image formed on the hologram image printing unit 600 and authentication of the owner using the authentication image are hindered by the image formed by the diffracted light. While suppressing this, it is possible to display a hologram image and an image of the luminescent fine particles 207.
　また、画像表示媒体６０２上に所定の層を印刷あるいは貼合にて形成させる場合には、その最表面上にアンカー層を形成する処理やコロナ処理のような表面処理を施してもよい。 Further, when a predetermined layer is formed on the image display medium 602 by printing or bonding, a surface treatment such as a treatment for forming an anchor layer on the outermost surface or a corona treatment may be performed.
　２００　…　ホログラム画像形成用媒体
　２０１　…　基材
　２０２　…　バックコート層
　２０３　…　剥離層
　２０４　…　ＯＶＤ層
　２０４Ｒ　…　Ｒエリア
　２０４Ｇ　…　Ｇエリア
　２０４Ｂ　…　Ｂエリア
　２０４Ｓ　…　センサーマーク部
　２０５　…　反射層
　２０６　…　接着層
　２０７　…　発光性微粒子
　２０８　…　ホログラム印画層
　３００　…　中間箔
　３０１　…　受像層
　３０２　…　基材
　４００　…　発熱源
　４０１　…　ロール
　５００　…　被転写体
　６００　…　ホログラム画像印字部
　６０１　…　写真画像表示部
　６０２　…　画像表示媒体 DESCRIPTION OF SYMBOLS 200 ... Hologram image formation medium 201 ... Base material 202 ... Backcoat layer 203 ... Release layer 204 ... OVD layer 204R ... R area 204G ... G area 204B ... B area 204S ... Sensor mark part 205 ... Reflective layer 206 ... Adhesive layer 207 ... Luminescent fine particles 208 ... Hologram printing layer 300 ... Intermediate foil 301 ... Image receiving layer 302 ... Base material 400 ... Heat source 401 ... Roll 500 ... Transfer object 600 ... Hologram image printing part 601 ... Photo image display part 602 ... Image display medium

Claims (5)

  1. 　基材と、
    　前記基材上に積層された転写層であって、少なくとも剥離層、ＯＶＤ層、及び、接着層を有する前記転写層と、
    　を備えるホログラム画像形成用媒体であって、
    　前記転写層のうち、前記ＯＶＤ層以外のいずれかの層が発光性微粒子を含み、
    　前記発光性微粒子が、赤外線の波長から紫外線の波長までの波長領域内に励起スペクトルのピーク波長を有し、かつ、前記発光性微粒子の発光における極大波長が、前記励起スペクトルのピーク波長と互いに異なる
    　ホログラム画像形成用媒体。     A substrate;
    A transfer layer laminated on the substrate, the transfer layer having at least a release layer, an OVD layer, and an adhesive layer;
    A hologram image forming medium comprising:
    Of the transfer layer, any layer other than the OVD layer contains luminescent fine particles,
    The luminescent fine particle has a peak wavelength of an excitation spectrum in a wavelength region from an infrared wavelength to an ultraviolet wavelength, and a maximum wavelength in light emission of the luminescent fine particle is different from the peak wavelength of the excitation spectrum. Hologram image forming medium.
  2. 　前記ＯＶＤ層が回折格子を含む複数の微細凹凸構造部を有し、前記微細凹凸構造部の間において、前記回折格子における空間周波数及び格子角度の少なくとも一方が互いに異なる
    　請求項１に記載のホログラム画像形成用媒体。     The hologram image according to claim 1, wherein the OVD layer has a plurality of fine concavo-convex structure portions including a diffraction grating, and at least one of a spatial frequency and a grating angle in the diffraction grating is different between the fine concavo-convex structure portions. Forming medium.
  3. 　前記接着層が、前記発光性微粒子を含む
    　請求項１又は２に記載のホログラム画像形成用媒体。     The hologram image forming medium according to claim 1, wherein the adhesive layer includes the luminescent fine particles.
  4. 　請求項１から３のいずれかに記載のホログラム画像形成用媒体を用いて形成されたホログラム画像を含む画像表示媒体。 An image display medium including a hologram image formed using the hologram image forming medium according to any one of claims 1 to 3.
  5. 　請求項２に記載のホログラム画像形成用媒体を用いて形成されたホログラム画像を含む画像表示媒体であって、
    　前記画像表示媒体は、前記画像表示媒体を所有する所有者を認証するための認証用画像であって、前記発光性微粒子が形成する前記認証用画像を含み、
    　前記発光性微粒子の発光における極大波長が赤外線の波長領域に含まれ、
    　前記回折格子は、前記回折格子における前記空間周波数によって前記回折格子の射出する回折光の波長が可視領域に含まれるように構成されている
    　画像表示媒体。     An image display medium including a hologram image formed using the hologram image forming medium according to claim 2,
    The image display medium is an authentication image for authenticating an owner who owns the image display medium, and includes the authentication image formed by the luminescent fine particles,
    The maximum wavelength in light emission of the luminescent fine particles is included in the infrared wavelength region,
    The image display medium, wherein the diffraction grating is configured such that a wavelength of diffracted light emitted from the diffraction grating is included in a visible region by the spatial frequency in the diffraction grating.
PCT/JP2016/068422 2015-06-22 2016-06-21 Medium for forming hologram image, and image display medium using same WO2016208590A1 (en)

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