JP7006016B2 - Personal authentication medium - Google Patents

Description

The present disclosure relates to a personal authentication medium, and more particularly to a personal authentication medium in which a security element in a personal authentication medium such as a card or a passport is included and identification information with laser engraved information is recorded.

In personal authentication media such as cards and passports, anti-counterfeit media in the form of encapsulating security elements are chemicals and wear and direct when compared to other forms in which the security element is placed on the surface of the medium. It is extremely resistant to tampering and counterfeiting, and has the advantage of being difficult to remove by unauthorized means.

Further, the introduction of laser engraving for protecting a personal authentication medium from unauthorized duplication is known in Patent Document 1 and the like. Laser engraving generally involves introducing a layer in a personal authentication medium that has the property of absorbing and discoloring laser light of a specific wavelength, and irradiating the laser light adjusted to an appropriate wavelength, intensity, and size. By doing so, the color is changed to black and the information is recorded. Since laser engraving can write different information to each personal authentication medium, individual information such as the owner's face and signature shape, which are difficult to be illegally duplicated or altered, is often written.

On the other hand, it is difficult to create different patterns for the included security elements, and a common pattern is often used in the anti-counterfeiting medium for personal authentication. Therefore, because a common pattern is used, there is a considerable possibility that a forgery will be performed in which the security element extracted in advance is pasted on the falsified personal information by illegally extracting it and rewriting only the personal information. .. In addition, if these are tampered with or forged, it may be difficult to identify them.

International Publication No. 2012/050223

In order to prevent unauthorized use of anti-counterfeiting media for personal authentication containing security elements by forgery and falsification, new technologies are constantly required, and further improvement of security measures is required.

In the first invention, a white core base material and a tamper-proof layer are provided on one side of the white core base material using invisible ink on a part or the entire surface, and face the white core base material of the tamper-proof layer. A laser color-developing base material that develops color by irradiating a laser beam on the surface opposite to the side facing the tamper-proof layer is provided, and the side opposite to the side facing the tamper-proof layer of the laser color-developable base material is provided. Provided is a laminate in which a security element is provided on a part or the entire surface of the security element, and the transparent protective base material is provided on the surface of the security element opposite to the side facing the laser color-developing base material.

In the second invention, a white core base material and a laser color-developing base material that develops color by irradiating one side of the white core base material with a laser beam are provided, and the white core base of the laser color-developing base material is provided. An tamper-proof layer is provided on a part or the entire surface of the surface opposite to the side facing the material using invisible ink, which is opposite to the side of the tamper-proof layer facing the laser color-developing substrate. Provided is a laminate in which a security element is partially or entirely provided on a side surface, and a transparent protective base material is provided on a surface opposite to the side facing the tamper-proof layer of the security element.

In the third invention, a white core base material and a laser color-developing base material that develops color by irradiating one side of the white core base material with a laser beam are provided, and the white core base of the laser color-developing base material is provided. A security element is partially or entirely provided on the surface opposite to the side facing the material, and invisible ink is used so as to face the exposed surface of the security element and the laser color-developing substrate. Provided is a laminate in which a tamper-proof layer is provided on a part or the entire surface, and a transparent protective base material is provided on a surface of the tamper-proof layer opposite to the side facing the security element of the tamper-proof layer.

In the fourth invention, a white core base material and a laser color-developing base material that develops color by irradiating one side of the white core base material with a laser beam are provided, and the white core base of the laser color-developable base material is provided. A security element is partially or entirely provided on the surface opposite to the side facing the material, and a transparent protecting group is provided on the surface opposite to the side facing the laser color-developing substrate of the security element. Provided is a laminate comprising a material and further provided with a tamper-proof layer partially or entirely on the surface of the transparent protective substrate opposite to the side facing the security element using invisible ink.

The laminate according to claim 1, wherein the fifth invention is an ink characterized in that the falsification prevention layer has no absorption in the visible region and has absorption in the infrared region.

The sixth invention provides the laminate according to claims 1 to 5, characterized in that it has been applied for recording identification information.

The seventh invention provides the laminate according to claims 1 to 6, characterized in that it is a card or a passport.

The eighth invention is to irradiate the laminate according to claims 1 to 6 with laser light from the transparent protective base material side to develop a color of the laser color-developing base material and at the same time inactivate the tamper-proof layer. Provides a method of simultaneously recording the same identification information.

The ninth invention provides the laminate according to claim 1 to 7, wherein the identification information is recorded by the method according to claim 8.

According to the present disclosure, when infrared absorbing ink is used as the invisible ink, when the laminated body 1 is tampered with, it is visually observed as shown in FIG. 7, so that it is not apparent that the tampering has been performed. .. However, when observing with an infrared camera, since the image of the inactivated falsification prevention unit 2a and the fraudulent image 8 do not match, the image as shown in FIG. 9 is observed, and fraud can be detected.

The cross-sectional view which shows the cross-sectional structure which embodied the laminated body. The cross-sectional view which shows the cross-sectional structure after irradiating the laminated body with a laser beam. The plan view which shows the plan structure of the laminated body of FIG. Observation image of the layered body of FIG. 3 by an infrared camera. FIG. 2 is a cross-sectional view showing a cross-sectional structure when the laminate of FIG. 2 is illegally peeled off. Observation image of the infrared camera of the tamper-proof layer of FIG. A plan view showing a plan structure of a laminated body which has been tampered with and printed with an illegal image. FIG. 6 is a cross-sectional view showing the B-B'cross-sectional structure of FIG. Observation image of the layered body of FIG. 7 by an infrared camera. The cross-sectional view which shows the cross-sectional structure which embodied the laminated body. The cross-sectional view which shows the cross-sectional structure after irradiating the laminated body with a laser beam. The cross-sectional view which shows the cross-sectional structure which embodied the laminated body. The cross-sectional view which shows the cross-sectional structure after irradiating the laminated body with a laser beam. The cross-sectional view which shows the cross-sectional structure which embodied the laminated body. The cross-sectional view which shows the cross-sectional structure after irradiating the laminated body with a laser beam. The cross-sectional view which shows the cross-sectional structure which embodied the laminated body. The plan view which shows the plan structure of the laminated body of FIG. The cross-sectional view which shows the cross-sectional structure after irradiating the laminated body with a laser beam. Observation image of the layered body of FIG. 18 by an infrared camera. An observation image of an infrared camera of a laminated body obtained by falsifying the laminated body of FIG. 18 and printing an illegal image.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. Components that exhibit similar or similar functions are designated by the same reference numerals throughout the drawings, and duplicate description will be omitted.

In FIG. 1, a tamper-proof layer 2 is provided on a white core base material 3 using invisible ink, and a laser color-developing base material 4 is provided so as to sandwich the tamper-proof layer 2, and the laser color-developing base material 4 is provided. The laminated body 1 provided with the security element 5 and the printed area 7 on the transparent protective base material 6 is shown.

Further, when the laser beam is applied to the laminated body 1 from the transparent protective base material 6 side, the laser light passes through the transparent protective base material 6 and the security element 5 and reaches the laser color-developing base material 4. As a result, the laser color-developing base material 4 absorbs the laser light and carbonizes the resin, so that color is developed and printing becomes possible. At the same time, the laser beam reaches the tamper-proof layer 2 under the laser color-developing substrate 4. The part exposed to the laser beam is heated and the invisible ink is inactivated. As shown in FIG. 2, the laser color-developing region 4a and the tamper-proof layer 2 have an inactivated tamper-proof portion 2a, and the security element 5 and the laser color-developing region 4a pass through the transparent protective base material 6 as shown in FIG. Both of the prints can be observed at the same time.

Further, for example, when an infrared absorbing ink is used as the invisible ink, it is peeled off between the laser color-developing base material 4 and the tamper-proof layer 2 as shown in FIG. 5, and the tamper-proof layer 2 is observed with an infrared camera. The falsification prevention layer 2 is inactivated in the portion irradiated with the laser beam. Therefore, the inactivated tamper-proof portion 2a is observed in white without absorbing infrared rays, and an image as shown in FIG. 6 can be confirmed. Further, the laser coloring region 4a of the laser coloring base material 4 is deleted, the laser coloring base material 4 is provided again, the bonding is performed together with the transparent protective base material 6, and then the laser beam is irradiated to obtain an illegal image 8. When the laser is printed and tampered with, it is visually observed as shown in FIG. 7, so that it is not apparent that the tampering has occurred. However, when observing with an infrared camera, since the image of the inactivated falsification prevention unit 2a and the fraudulent image 8 do not match, the image as shown in FIG. 9 is observed and fraud can be detected.

In FIG. 10, a laser color-developing base material 4 is provided on a white core base material 3, a tamper-proof layer 2 is provided using invisible ink, and a security element 5 and a printing area 7 are provided on the tamper-proof layer 2. 1 is provided, and the laminated body 1 is further provided with the transparent protective base material 6.

By irradiating the laminated body 1 with laser light from the transparent protective base material 6 side, the laser light passes through the transparent protective base material 6 and the security element 5 and reaches the tamper-proof layer 2. The portion exposed to the laser beam is heated, the invisible ink is inactivated, and the inactivated tamper-proof portion 2a can be obtained. Further, the laser light reaches the laser color-developing base material 4, absorbs the laser light, and carbonizes the resin to develop color and perform printing. As shown in FIG. 11, the inactivated tamper-proof portion 2a and the laser coloring region 4a are obtained, and both the security element 5 and the printing which is the laser coloring region 4a are simultaneously observed through the transparent protective substrate 6. be able to. When the laminated body 1 is tampered with, the image of the inactivated tamper-proof unit 2a and the fraudulent image 8 do not match, and an image as shown in FIG. 9 is observed, and fraud can be detected.

In FIG. 12, a laser color-developing base material 4 is provided on the white core base material 3, a security element 5 and a printing area 7 are provided on the laser color-developing base material 4, and further, a security element 5 and a laser color-developing group are provided. The laminate 1 in which the tamper-proof layer 2 and the transparent protective base material 6 are sequentially provided so as to cover the material 4 and the printed area 7 is shown.

By irradiating the laminated body 1 with laser light from the transparent protective base material 6 side, the laser light passes through the transparent protective base material 6 and when it reaches the tamper-proof layer 2, the invisible ink is inactivated. An inactivated tamper-proof unit 2a can be obtained. Further, it passes through the security element 5 and reaches the laser color-developing base material 4, and the laser color-developing base material 4 absorbs the laser light and carbonizes the resin to develop color and perform printing. As shown in FIG. 13, the inactivated tamper-proof portion 2a and the laser coloring region 4a are obtained, and both the security element 5 and the printing which is the laser coloring region 4a are simultaneously observed through the transparent protective substrate 6. Can be done. When the laminated body 1 is tampered with, the image of the inactivated tamper-proof unit 2a and the fraudulent image 8 do not match, and an image as shown in FIG. 9 is observed, and fraud can be detected.

In FIG. 14, a laser color-developing base material 4 is provided on the white core base material 3, a security element 5 and a printing area 7 are provided on the laser color-developing base material 4, and a transparent protective base material 6 and tamper-proof. The laminated body 1 in which the layer 2 is sequentially provided is shown.

Further, by irradiating the laminated body 1 with laser light from the tamper-proof layer 2 side, the laser light inactivates the invisible ink in the tamper-proof layer 2 and obtains the inactivated tamper-proof portion 2a. can. Further, it passes through the transparent protective base material 6 and the security element 5 to reach the laser color-developing base material 4, and the base material absorbs the laser light and carbonizes the resin to develop color and print. As shown in FIG. 15, the inactivated tamper-proof portion 2a and the laser coloring region 4a are obtained, and both the security element 5 and the printing which is the laser coloring region 4a are simultaneously observed through the transparent protective substrate 6. be able to. When the laminated body 1 is tampered with, the image of the inactivated tamper-proof unit 2a and the fraudulent image 8 do not match, and an image as shown in FIG. 9 is observed and fraud is detected.

When the tamper-proof layer 2 uses an ink that does not absorb in the visible region and absorbs in the infrared region, the image cannot be visually confirmed, and the image is observed when observed with an infrared camera. Further, when observing with an infrared camera before tampering, the laser color development region 4a and the inactivated tamper-proof portion 2a are observed overlapping because the same identification information is formed at the same position, FIG. It is observed as an image like. However, when falsification is performed, the inactivated tamper-proof unit 2a and the fraudulent image 8 as shown in FIG. 9 are observed to be misaligned, and fraud can be detected.

As described above, the laminated body 1 in which the identification information is recorded in the card or the passport is provided with a novel design property, a high degree of forgery and falsification prevention property, as compared with the conventional one.

Since the laminated body 1 is irradiated with laser light and the same identification information is simultaneously recorded on the laser color-developing base material 4 and the falsification prevention layer 2, the falsification prevention effect is extremely high.

Further, even if the falsification prevention layer 2 is partially provided with a handle as shown in FIGS. 16 and 17, a high falsification prevention effect can be obtained. When partially provided as a handle, for example, as shown in FIGS. 18 and 19, a sensor mark or the like is provided with invisible ink, and the sensor mark or the like is read and aligned to provide the security element 5. Since the security element 5 and the tamper-proof layer 2 are associated with each other, the tamper-proof effect is further enhanced. Further, by reading the sensor mark of the invisible ink for alignment and providing the identification information of the laser coloring region 4a by irradiating the laser light, the laser coloring region 4a and the tamper-proof layer 2 are associated with each other, so that the tamper-proof effect is further improved. Can be enhanced.

The laminated body 1 partially provided with the tamper-proof layer 2 is tampered with, an unauthorized image 8 is provided, and the tampered laminated body 9 is observed with an infrared camera to inactivate it as shown in FIG. The falsification prevention unit 2a and the laser coloring region 2a corresponding to the fraudulent image 8 are observed without overlapping, and it can be detected that fraudulent activity has been performed.

(Base material)
Plastic can be used as the material of the white core base material 3, the laser color-developing base material 4, and the transparent protective base material 6 constituting the laminate 1. As the plastic, it is preferable to use a thermoplastic resin. These include cellophane, polyethylene, polypropylene, polyolefin, ethylene vinyl alcohol, polyvinyl alcohol, polyethylene naphthalate, polyethylene terephthalate, nylon, acrylic resin, triacetyl cellulose film and the like. In particular, it is preferable to use a polyvinyl chloride resin, an amorphous polyester resin, a polycarbonate resin or the like used for a conventional card or passport base material as a material, because laminating and integrating processing by heat, pressure or the like becomes easy. When a transparent base material is used, a material that transmits a near-ultraviolet region and a near-infrared region is preferable. The thickness of the base material is preferably 25 μm or more and 200 μm or less. If the thickness is thinner than 25 μm, the physical strength as a base material is insufficient and it is difficult to handle, and wrinkles and the like are likely to occur when printing or the like is provided. On the other hand, if it is thicker than 200 μm, the influence of the thickness variation and deflection of the base material itself during processing tends to be large. A more preferable thickness is 50 or more and 150 μm or less.

(Laser color-developing base material)
The laser color-developing base material 4 is a base material that develops color by irradiating an industrially general-purpose laser light in the infrared region with a wavelength of 700 or more and 1200 nm or less, and if necessary, a resin that can be used for the above-mentioned base material. It is produced by adding the following additives.

As a method of developing a laser color, for example, 1) a method of foaming a resin to develop a color, 2) a method of adding an additive that absorbs laser light to the resin to develop a color of the additive itself, and 3) a method of absorbing laser light to the resin. A method of adding an additive to generate heat of the additive and carbonizing the surrounding resin to develop a color can be used.

When foaming the resin, it may be configured to foam the resin when irradiated with laser light. For example, the resin is heated and softened by irradiating with laser light, and is added. There is a method of foaming a resin by generating gas with a foaming agent or the like. Examples of such foaming agents include azo compounds such as diazonium salts.

As a method for developing the color of the additive, it is conceivable to develop a color by a photon mode such as a photochromic material or a heat mode such as a leuco dye combined with a developer. However, if the material is irreversible, the stability of the printed matter can be easily obtained.

Materials that absorb laser light and develop color include lead carbonate, lead sulfate, lead stearate, white lead, silver acetate, cobalt oxalate, cobalt carbonate, yellow iron oxide, basic bismuth acetate, bismuth hydroxide, and nickel acetyl acetate. , Nickel lactate, copper citrate, copper carbonate, and other compounds containing heavy metals. In these materials, color development is caused by a chemical change such as a change in the crystal structure of a metal ion contained in the material or a change in the amount of hydration contained in the crystal of the metal ion. Further, leuco dyes such as fluorane type, phenothiazine type, spiropyran type, triphenylmethphthalide type and rhodamine lactam type and a color developer may be used.

As the additive having absorption in the wavelength range of the laser light, either an inorganic material or an organic material can be used as long as it is a material capable of converting the laser light into heat. By using a material that can convert laser light into heat, it is possible to develop a black color by carbonizing the resin around the laser light absorber. Materials that can convert laser light into heat include, for example, silicon-containing inorganic compounds, silicon-containing dyes, radiation-absorbing substances such as metal silicates, inorganic fillers such as hydrated alumina, pigments containing phosphates, and non-white materials. Titanium metal salts, black organic dyes, non-black inorganic lead compounds, graphite, carbon black, graphite, metal hydroxides and / and those containing metal hydrous compounds and colorants, etc. It is not limited.

By adding these materials to the above-mentioned resin and forming a film, the laser color-developing base material 4 can be obtained. These materials can be selected according to the wavelength range of the laser light to be used and the like, and the amount to be added is determined by the energy absorption efficiency, the printability on the laser color-developing substrate 4, the transfer suitability, and the physical properties. The addition amount is preferably 0.1% by weight or more and 30% by weight or less, preferably 1% by weight or more and 10% by weight or less with respect to the binder. If it is less than 0.1% by weight, the laser color density is lowered and the visibility is inferior. If it is more than 30% by weight, the printability and transfer suitability are lowered, and the mechanical properties are also lowered.

The thickness of the laser color-developing substrate 4 is preferably 25 μm or more and 200 μm or less. If the thickness is thinner than 25 μm, the physical strength as a base material is insufficient and it is difficult to handle, and wrinkles and the like are likely to occur when printing or the like is provided. On the other hand, if it is thicker than 200 μm, the influence of the thickness variation and deflection of the base material itself during processing tends to be large. A more preferable thickness is 50 μm or more and 150 μm or less.

The lasers that can be used in the present disclosure may be, for example, a far infrared laser including a CO ₂ laser, a near infrared pulse laser including an Nd: YAG laser and an Nd: YVO laser, a visible light pulse laser, and an excima laser. .. Further, for example, an ultraviolet laser using a third harmonic of an Nd: YAG laser or an Nd: YVO laser, a semiconductor laser, a femtosecond laser, a picosecond laser, or the like may be used.

Of these lasers, a laser using the third harmonic of an Nd: YAG laser or an Nd: YVO laser is preferable from the viewpoint of being able to draw with high resolution.

A laser capable of emitting light in the infrared region and its oscillation wavelength are, for example, as follows. The GaAlAs semiconductor laser oscillates a laser beam having a wavelength of 635 nm or more and 840 nm or less, and the GaAs semiconductor laser oscillates a laser beam having a wavelength of 840 nm. The InP semiconductor laser oscillates a laser beam having a wavelength of 910 nm, and the YAG laser oscillates a laser beam having a wavelength of 1064 nm.

The identification information of the laser coloring region 4a may be personal authentication information that can be used for personal authentication. The personal authentication information may include at least one of biometric information and non-biological information.

Biometric information is an individual-specific feature of the body to be authenticated, such as an image or pattern such as a physiognomy, a fingerprint, and a vein. Non-biological information is personal information other than biometric information, and includes, for example, name, date of birth, age, blood type, gender, nationality, address, registered domicile, telephone number, affiliation, and status. The non-living personal information may be characters formed by typing, may be a handwritten signature of the owner, or may be a combination thereof.

(Falsification prevention layer)
The falsification prevention layer 2 can be formed by inking a material that cannot be visually confirmed and can be recognized by using a discriminating device and by a known printing method. As a printing method, for example, an offset printing method, a gravure printing method, a letterpress printing method, an intaglio printing method, a screen printing method, an inkjet printing method, or the like can be used for forming. As the ink used in these printing methods, inks and inks suitable for the printing method such as offset ink, typographic ink and gravure ink, letterpress ink, ingot ink, and inkjet ink can be appropriately used, and the composition and function can be used. Depending on the situation, for example, resin ink, oil-based ink, and water-based ink can be used. Further, for example, an oxidation polymerization type ink, a penetration drying type ink, an evaporation drying type ink, and an ultraviolet curable type ink can be used depending on the difference in the drying method. As the material, a material that does not absorb in the visible region and causes fluorescence emission when exposed to specific light may be used. Further, a material that does not absorb in the visible region and absorbs in the infrared region may be used.

As the material that imparts fluorescence emission, a material that is excited by light of a specific wavelength and emits light of a different wavelength, and generally known inorganic or organic materials can be used. Examples of the inorganic ultraviolet phosphor include _Ca2 B ₅ O ₃ C _l : Eu ₂₊ , CaWO ₄ , ZnO: Zn ₂ SiO ₄ : Mn, Y ₂ O ₂ S: Eu, ZnS: Ag, YVO ₄ : Eu, Y ₃ 0 ₃ : Eu, Gd ₂ O ₂ S: Tb, La ₂ O ₂ S: Tb, Y ₃ Al ₅ O ₁₂ : Ce and the like.

For inorganic visible phosphors, for example, YF ₃ : YB, Er, ZnS: CuCo, etc., for infrared rays, for example, LiNd _0.9 Yb _0.1 P4O ₁₂ , LiBi _0.2 Nd _0.7 Yb _0.1 P ₄ O ₁₂ , Nd _0.9 Yb. _0.1 Nd ₅ (MoO ₄ ) ₄ , NaNb _0.3 Yb _0.1 P ₄ O ₁₂ , Nd _0.8 Yb _0.2 Na ₅ (W0 ₄ ) ₄ , Nd _0.8 Yb _0.2 Na ₅ (Mo _0.5 WO _0.5 ) ₄ , Ce _0.05 Gd _0.05 Nd _0.75 Yb _0.25 Na ₅ (W _0.7 Mo _0.3 0 ₄ ) ₄ , Nd _0.3 Yb _0.1 Al ₃ (BO ₃ ) ₄ , Nd _{0 ・ 9} Yb _0.1 Al _2.7 Cr _0.3 (BO ₃ ) ₄ , Nd _0.4 P ₅ O ₄ , Nd _0.8 Yb _0.2 K ₄ (PO ₄ ) ₂ etc. can be selected.

As the infrared absorbing material, generally known inorganic compounds and organic compounds can be used, and a material that does not absorb in the visible region and absorbs in the infrared region is preferable, and is close to the infrared region. Materials that absorb in the infrared region are preferred. As the wavelength to be absorbed, specifically, it is preferable that the wavelength has absorption in the near infrared region of 700 to 1200 nm. For example, at least one selected from the group consisting of a phthalocyanine compound, a naphthalocyanine compound, an anthraquinone compound, a diimonium compound, and a cyanine compound can be used.

These materials are selected in consideration of detection wavelength, dispersibility, emission intensity, safety, etc. and added to the binder. For example, it is preferably added in the range of 2% by weight or more and 15% by weight or less, preferably 3% by weight or more and 5% by weight or less with respect to the binder. If it is less than 2% by weight, the light emission is weak and difficult to observe, and if it is more than 15% by weight, the physical resistance of the tamper-proof layer 2 is significantly lowered. This makes it possible to see the light emission under irradiation with a black lamp (ultraviolet rays) or infrared rays (780 nm or more) when a fluorescent light-emitting material is used. Further, when a material that absorbs infrared rays is used, when the observation is performed in the infrared region, absorption occurs and the observation is made in black.

The falsification prevention layer 2 may be provided on the entire surface, or may be partially provided with a handle or the like. The pattern may be composed of at least one such as letters, numbers, symbols, figures, and a predetermined image. Further, it is also possible to provide a laser engraving area, a security element 5 installation area, etc. together with the sensor mark on the tamper-proof layer 2, and perform laser engraving and security element 5 installation while aligning with the tamper-proof layer 2. ..

(Security element)
As the security element 5, a medium capable of visually determining authenticity or a medium capable of determining authenticity using a verifier or the like can be used. The medium for visual determination may be, for example, a medium for determining authenticity by optical interference such as a hologram having a relief structure, or a multilayer film in which thin films of ceramics or metal materials having different optical characteristics are laminated, or the like, depending on the viewing angle. It may be a medium that causes a change (color shift) in. Further, a medium may be used for making a judgment by irradiating light having a specific wavelength using a fluorescent material, or a medium for making a judgment using a verifier using a cholesteric liquid crystal display or the like. In this disclosure, a medium having a relief structure will be mainly described as an example.

The security element 5 of the present disclosure is composed of a relief structure forming layer 5a, a relief structure 5b, a reflective layer 5c, and an adhesive layer 5d, and these are sequentially laminated on a separately prepared support base material to form a transfer foil for transfer by thermal pressure. May be provided. Further, a protective layer may be introduced in order to improve heat resistance, solvent resistance, and wear resistance.

(Relief structure forming layer)
As the relief structure forming layer 5a, a thermoplastic resin, a thermosetting resin, ultraviolet rays, an electron beam curable resin, or the like can be used. For example, examples of the thermoplastic resin include acrylic resin, epoxy resin, cellulosic resin, vinyl resin, polycarbonate resin and the like. Further, urethane resins, melamine-based resins, phenol-based resins and the like obtained by adding polyisocyanate as a cross-linking agent to cross-linking an acrylic polyol or polyester polyol having a reactive hydroxyl group can be used. Of these, epoxy (meth) acrylic, urethane (meth) acrylate and the like can also be used as the ultraviolet or electron beam curable resin. Further, in order to observe the laser coloring region 4a through the security element 5, it is preferable that the relief structure forming layer 5a is transparent. It may be provided in a single layer or in multiple layers. Further, if necessary, an anchor layer for adhering each layer may be provided.

(Relief structure)
As for the method of recording the image pattern of the relief structure 5b, it can be produced by a conventionally known hologram manufacturing method such as an image hologram, a lipman hologram, a rainbow hologram, or an integral hologram, in addition to the two-beam interferometry. Is.

Further, the uneven pattern of the relief structure 5b can form the security element 5 by irradiating the surface of the electron beam curable resin with an electron beam and exposing the striped pattern to be a diffraction grating. In this case, since the interference fringes can be controlled one by one, it is possible to record an arbitrary stereoscopic image or a changing image as in the case of a hologram. It is also possible to divide the image into dot-shaped pixel regions, record different diffraction gratings for each pixel region, and express the entire image with a set of these ancestors. Pixels may be star-shaped dots as well as circular dots.

It is also possible to form the relief structure 5b by the induced surface relief forming method. That is, by irradiating an amorphous thin film of a polymer having azobenzene on the chain side with relatively weak light of about several tens of mW / cm ² having a certain wavelength in the range of blue to green, the scale is several μm. As a result, it is possible to form relief due to unevenness on the surface of the thin film.

Then, by forming a metal film on the surface of the relief type master plate having the unevenness pattern thus formed by an electroplating method, the unevenness pattern of the relief type master plate is duplicated, and this is used as a press plate. Then, the relief structure 5b can be formed by thermocompression bonding the press plate and transferring a fine uneven pattern to the surface of the relief structure.

(Reflective layer)
A reflective layer 5c may be provided on the relief structure 5b forming surface in order to enhance the optical effect. Examples of the material of the reflective layer 5c include simple substances of metal materials such as Al, Sn, Cr, Ni, Cu, Au, and Ag, or compounds thereof. These can be used in a single layer or multiple layers. Further, it may have a mask layer for protection and an anchor layer for adhering to the relief structure forming layer 5a.

Further, a transparent reflective layer which is almost transparent to light perpendicular to the film surface but exhibits reflective characteristics depending on the refractive index to oblique light can also be used as a single layer or a multilayer. Examples of materials that can be used as a transparent reflective layer are given below. The numerical value in parentheses following the chemical formula or compound name shown below indicates the refractive index n. Ceramics include Fe ₂ O ₃ (2.9), TiO ₂ (2.5), CdS (2.6), CeO ₂ (2.2), ZnS (2.3), and CdO (2.2). , WO ₃ (2.2), Ta ₂ O ₃ (2.2), ZrO ₂ (2.05), MgO (1.74), SiO ₂ (1.45), MgF ₂ (1.4), Examples thereof include CeF ₃ (1.63), CaF ₂ (1.3 to 1.4), AlF ₃ (1.38) and Al ₂ O ₃ (1.6). Examples of the organic polymer include polyethylene (1.51), polypropylene (1.49), polytetrafluoroethylene (1.35), polymethylmethacrylate (1.49), polystyrene (1.60) and the like. Not limited.

As a method for forming the reflective layer 5c, for example, a known method such as a vacuum vapor deposition method, a sputtering method, or a CVD method can be appropriately used. Further, an ink having a light reflection effect or the like may be provided by a known printing method.

(Adhesive layer)
The adhesive layer 5d can be formed by using a material exhibiting general adhesiveness. For example, vinyl chloride-vinyl acetate copolymer, polyester polyamide, acrylic, butyl rubber, natural rubber, silicon, polyisobutyl adhesive can be used alone, or alkyl methacrylate, vinyl ester, acrylic nitrile, styrene. , Agglomerating components such as vinyl monomers, unsaturated carboxylic acids, hydroxy group-containing monomers, and modifying components typified by acrylic nitriles are added. If necessary, additives such as an adhesive-imparting agent, a filler, a softener, a light stabilizer, and an antioxidant can be added as needed.

Examples of the adhesive-imparting agent include rosin-based resin, terpene phenol-based resin, terpene resin, aromatic hydrocarbon-modified terpene resin, petroleum resin, kumaron-inden resin, styrene-based resin, phenol-based resin, xylene resin and the like. Examples of the filler include zinc oxide, titanium oxide, silica, calcium carbonate, barium sulfate and the like.

Examples of the softener include process oils, liquid rubbers, and plasticizers. Examples of the thermal light stabilizer include benzophenone type, benzotriazole type and hindered amine type, and examples of the antioxidant include anilides type, phenol type, phosphite type and thioester type.

The thickness of the adhesive layer 5d is appropriately selected depending on the intended use, but is usually 0.1 μm or more and 10 μm or less, preferably 1 μm or more and 5 μm or less.

(Print area)
The print area 7 is an area provided entirely or partially by an arbitrary color, pattern, character, symbol, pattern, or the like in order to give information or a design to be conveyed.

The print area 7 can be formed by a known printing method using ink. As a printing method, for example, an offset printing method, a gravure printing method, a letterpress printing method, an intaglio printing method, a screen printing method, an inkjet printing method, or the like can be used for forming. As the ink used in these printing methods, inks and inks suitable for the printing method such as offset ink, typographic ink and gravure ink, letterpress ink, ingot ink, and inkjet ink can be appropriately used, and the composition and function can be used. Depending on the situation, for example, resin ink, oil-based ink, and water-based ink can be used. Further, for example, an oxidation polymerization type ink, a penetration drying type ink, an evaporation drying type ink, and an ultraviolet curable type ink can be used depending on the difference in the drying method. Further, a functional ink whose color changes according to the illumination angle or the observation angle of light may be used. Examples of such functional inks include optical change inks, color shift inks, and pearl inks.

Alternatively, the print area 7 may be formed by an electrophotographic method using toner. In this case, for example, a toner in which colored particles such as graphite and pigment are attached to chargeable plastic particles is prepared, and the toner is transferred to an object to be printed by using static electricity generated by the charge, and this is heated. By fixing, the print area 7 can be formed.

The information included in the print area 7 may be composed of at least one such as characters, numbers, symbols, figures, and a predetermined image.

When the laminate 1 produced with the above configuration is used as a personal authentication medium such as a card or passport on which identification information is recorded, it is extremely resistant to chemicals, wear, and direct falsification or forgery. It is possible to obtain a personal authentication medium that exhibits strong resistance to.

<Example 1>
Hereinafter, the present disclosure will be described in detail with reference to specific examples.

The laminated body 1 of FIG. 1 was manufactured by the following procedure.

An infrared absorbing material was inked on the white core base material 3 and printed on the entire surface to form a falsification prevention layer 2. Since the ink having no absorption was used in the visible region, it was difficult to confirm the tamper-proof layer 2 by visual observation.

Next, as a preparation for providing the security element 5 on the laser color-developing substrate 4, the security element 5 was formed on a separately prepared support and formed into a transfer foil. The transfer foil on which the security element 5 is formed uses a PET film with a thickness of 25 μm as a support, acrylic urethane is inked and coated by gravure printing, and the solvent contained in the ink is volatilized and removed to have a relief structure with a thickness of 2 μm. The cambium 5a was obtained. Then, a metal cylindrical plate having an uneven relief was pressed against this to perform a roll forming process to form a relief structure 5b. Then, ZnS was laminated as the reflective layer 5c on the formed relief structure 5b surface by a vacuum vapor deposition method. Further, polyester was inked on the reflective layer 5c and coated by gravure printing to volatilize and remove the solvent contained in the ink to obtain an adhesive layer 5d having a thickness of 4 μm, and the security element 5 was made into a transfer foil.

LEXAN SD8B94 100 μm thickness (SABIC Co., Ltd.) was used as the laser color-developing substrate 4. After hot-pressure transfer of the above-mentioned transfer foil with a hot stamp transfer machine, the support was removed, and the security element 5 was provided on the laser color-developing substrate 4. Then, a print area 7 was obtained with an inkjet printer.

After that, the surface of the white core base material 3 provided with the tamper-proof layer 2 and the surface of the laser color-developing base material 4 not provided with the security element are faced to each other, and further, the security element of the laser color-developing base material 4 is faced with each other. The transparent protective base material 6 was laminated on the surface provided with 5, and after thermal pressure laminating, it was punched out into a card mold to prepare a laminated body 1 as shown in FIG.

Then, a laser printing machine (manufactured by Keyence Co., Ltd .: "YVO4 laser marker MD-V9600") is used to irradiate the produced laminated body 1 with laser light from the transparent protective base material 6 side to obtain a laser color-developing group. A facial photograph image, which is a laser coloring region 4a, was printed on the material 4 to obtain a laminated body 1 as shown in FIG.

When the laminate 1 thus produced was observed, visually, as shown in FIG. 3, the security element 5, the print area 7, and the facial photograph image, which is the laser color development area 4a, were confirmed at the same time. After that, when observing with an infrared camera from the transparent protective base material 6 side, an image as shown in FIG. 4 was confirmed.

In an attempt to tamper with the laminate 1, the laser color-developing base material 4 and the tamper-proof layer 2 were once peeled off as shown in FIG. 5, and the laser color-developing region 4a was scraped off. At this time, when the tamper-proof layer 2 is observed with an infrared camera, an image as shown in FIG. 6 is confirmed, and the tamper-proof unit 2a having the same pattern at the same position as the laser color-developing region 4a due to irradiation with laser light is found. Recognized as a white image. After that, the laser color-developing base material 4 is provided again, reattached together with the transparent protective base material 6, and the facial photographic image different from the previous one is recorded as an illegal image 8 again by the laser printing machine. A tampered laminate 9 such as No. 8 was obtained.

When this was observed with an infrared camera from the transparent protective base material 6 side, the inactivated tamper-proof portion 2a and the laser color-developing region 4a corresponding to the fraudulent image 8 were observed to be misaligned as shown in FIG. Was detected.

<Example 2>
The laminated body 1 of FIG. 16 was manufactured by the following procedure.

On the white core base material 3, the infrared absorbing material was inked and printed in a pattern to form the falsification prevention layer 2. At this time, as shown in FIG. 17, along with the characters “GENUINE”, a sensor mark for alignment, a face photo image printing area, and a security element installation area are provided on the falsification prevention layer 2. Since the ink having no absorption was used in the visible region, it was difficult to confirm the tamper-proof layer 2 by visual observation.

Next, the security element 5 was transferred into a transfer foil in the same manner as in the first embodiment, and the security element 5 was provided in the security element installation area on the laser color-developing base material 4 while reading the sensor mark in the falsification prevention layer 2. Then, a print area 7 was obtained with an inkjet printer, the transparent protective base material 6 was hot-pressure laminated, and then punched out into a card mold to prepare a laminated body 1 as shown in FIG. When the laminated body 1 was observed with an infrared camera, an image as shown in FIG. 17 was observed. While reading the sensor mark in the tamper-proof layer 2, the face photograph image was printed on the laminate 1 by irradiating the face photograph image printing area with a laser beam to obtain the laminate 1 as shown in FIG. .. When this laminated body 1 was observed with an infrared camera from the transparent protective base material 6 side, an image as shown in FIG. 19 was confirmed.

When the laminated body in which the above-mentioned laminated body 1 is tampered with and the fraudulent image 8 is recorded is observed with an infrared camera, the inactivated tamper-proof unit 2a and the laser coloring region corresponding to the fraudulent image 8 are observed as shown in FIG. It was detected that the image was tampered with because 4a was misaligned and the image was observed to be misaligned from the facial photograph image printing area. Further, when the security element 5 and the transparent protective base material 6 are reattached, it is difficult to reattach them according to the security element installation area of the falsification prevention layer 2, so that the security element 5 is displaced from the security element installation area. It was also observed that there was.

1 ... Laminated body 2 ... Anti-tampering layer 2a ... Inactivated anti-tampering part 3 ... White core base material 4 ... Laser coloring base material 4a ... Laser coloring region 5 ... Security element 5a ... Relief structure forming layer 5b ... Relief structure 5c ... Reflective layer 5d ... Adhesive layer 6 ... Transparent protective base material 7 ... Printing area 8 ... Illegal image 9 ... Laminated body after tampering

Claims (6)

A white core base material and a laser color-developing base material that develops color by irradiating one side of the white core base material with a laser beam are provided, and the side of the laser color-developing base material facing the white core base material. A security element is partially or entirely provided on the surface opposite to the surface, and a tamper-proof layer is partially provided using invisible ink so as to face the exposed surface of the security element and the laser color-developing substrate. Alternatively, a laminate provided on the entire surface and having a transparent protective base material on the surface opposite to the side facing the security element of the tamper-proof layer. The laminate according to claim 1, wherein the tamper-proof layer is an ink characterized by having no absorption in the visible region and absorption in the infrared region. The laminate according to claim 1 or 2 , characterized in that it has been applied for recording identification information. The laminate according to claim 1 to 3 , which is a card or a passport. The same identification information is simultaneously recorded by irradiating the laminate according to claim 2 with laser light from the transparent protective base material side to develop the color of the laser color-developing base material and at the same time inactivating the tamper-proof layer. how to. The laminate according to claim 2 , wherein the identification information is recorded by the method according to claim 5 .

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