JP7006014B2 - Anti-counterfeit structure - Google Patents

Description

The present disclosure relates to, for example, an anti-counterfeit structure to which individual information such as a card or a passport is attached, and more particularly to an anti-counterfeit structure in which a transfer foil with an optical element is included and laser engraved information is applied.

Conventionally, there is known an anti-counterfeit structure in which a transfer foil with an optical element having a diffraction grating or a hologram is included, and further, laser engraved information is applied to protect the anti-counterfeit structure from unauthorized duplication.

The anti-counterfeit structure in which the transfer foil with an optical element having a diffraction grating or hologram is encapsulated has chemicals, abrasion and wear when compared with other forms in which the transfer foil is placed on the surface of the medium. It is extremely resistant to direct alteration and has the advantage of being difficult to remove by unauthorized means.

Further, an anti-counterfeit structure in which laser engraving is introduced in order to protect the anti-counterfeit structure from unauthorized duplication is known in Patent Document 1 and the like. Laser engraving is generally performed by introducing a layer having the property of absorbing specific laser wavelength light and discoloring it in the anti-counterfeiting structure, and by irradiating the laser light adjusted to an appropriate wavelength, intensity and size. Information is recorded by changing the color of the specific wavelength absorption layer to black. Laser engraving can write different information to each anti-counterfeit structure, so it is difficult to illegally copy or modify the anti-counterfeit structure, such as the owner's face and signature shape. Information is often written.

Japanese Patent No. 6107137

However, such a conventional anti-counterfeit structure has the following problems.

That is, it is difficult to individually produce different patterns for the included diffraction grating as an optical element because the method for producing the same pattern is generally to duplicate the same pattern from the same uneven plate. A common pattern is often used in anti-counterfeiting structures for personal authentication. In this way, because a common pattern is used, there is little possibility that it will be illegally taken out and only the personal information will be tampered with, or that the pre-extracted diffraction structure will be re-pasted on the tampered personal information. There is a problem that it does not exist.

There is also the problem that if these alterations or counterfeits are made, it may be difficult to identify them.

The present disclosure has been made in view of such circumstances, and an object of the present invention is to provide an anti-counterfeiting structure in which further security measures are taken to prevent forgery or unauthorized use due to falsification of the diffraction structure. And.

In order to achieve the above objectives, the following measures will be taken in this disclosure.

According to the first aspect of the present invention, the security device is arranged on at least a part or the entire surface of the color-developing layer having the laser color-developing portion, and the transparent protective sheet is arranged on the side of the security device opposite to the color-developing layer side. The anti-counterfeiting structure, the security device is configured by laminating an optical functional layer and an anti-replacement layer, and the anti-replacement layer has adhesiveness and laser alteration property, and the laser is provided. The color-developing portion is observed from the transparent protective sheet side through the transparent protective sheet and the security device.

The invention of claim 1 further includes the reattachment detection pattern recording unit that is paired with the laser coloring unit, and the reattachment detection pattern recording unit is provided from the transparent protective sheet side. It is characterized by being observed through the transparent protective sheet and the security device.

The invention of claim 2 is characterized in that, in the anti-counterfeit structure according to claim 1, the optical functional layer is a cholesteric liquid crystal that reflects vertically incident infrared light.

The invention of claim 3 is characterized in that, in the anti-counterfeit structure according to claim 1, the anti-replacement layer has fluorescence emission.

The invention of claim 4 is characterized in that it is applied for recording individual information in a card or a passport in the anti-counterfeit structure according to any one of claims 1 to 3 .

According to the first aspect of the present invention, when the color-developing layer is irradiated with a laser from the transparent protective sheet side, the laser light passes through the transparent protective sheet and the security device and reaches the surface of the color-developing layer to reach the surface of the color-developing layer and the color-developing layer and the anti-replacement layer. Can be printed by developing a color. Therefore, at the same time that arbitrary printing is possible, it is also possible to observe the color-developed layer after printing through the transparent protective sheet and the security device. It is possible to observe both the emitted light and the printed color, which is the developed color-developing layer, at the same time. It is also possible to remove the security device to erase the laser color area of the color layer to prevent forgery and tampering.

According to the first aspect of the present invention, since the reattachment prevention layer is further provided with a reattachment detection pattern recording unit paired with the laser coloring unit, it is possible to make forgery and tampering more difficult.

According to the invention of claim 2 , since the cholesteric liquid crystal that reflects the vertically incident infrared light is included, when the light is incident from the front, the infrared light is reflected, and the light incident from an angle is red. It will reflect visible light. Therefore, when the portion colored by the laser irradiation is observed through the transparent protective sheet and the security device, black printing is observed on the front surface, and red printing is observed when observed from an angle. In this way, it is possible to observe the change from black to red depending on the observation direction, so that a high anti-counterfeiting effect can be realized.

According to the third aspect of the present invention, since the reattachment prevention layer has fluorescence emission property, fluorescence emission can be observed using a dedicated inspection machine. As a result, even if the content printed on the security device is erased and reattached, the fluorescent light emission function will be lost at the same time as the print on the security device is erased, so it is possible to discover that it has been forged or tampered with. It will be possible.

According to the invention of claim 4 , it is possible to enhance the falsification prevention property of individual information in a card or a passport.

It is a top view which shows the anti-counterfeit structure of this disclosure. It is an example of the cross-sectional view in the cross section AA of FIG. It is another example of the cross-sectional view in the cross section AA of FIG. It is still another example of the cross-sectional view in the cross section AA of FIG. It is sectional drawing which shows an example after forgery and falsification of the anti-counterfeit structure of this disclosure. It is sectional drawing which shows another example after forgery and tampering of the anti-counterfeit structure of this disclosure. It is a top view which shows an example after forgery and falsification of the anti-counterfeit structure of this disclosure.

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.

FIG. 1 is a plan view showing the anti-counterfeit structure of the present disclosure. The anti-counterfeit structure 1 shown in FIG. 1 has a card shape, has a laser coloring region 2, a security device 3, and a printing unit 4 on the same plane, and can be visually observed at the same time.

FIG. 2 shows an example of a cross-sectional view taken along the line AA of the anti-counterfeit structure 1 shown in FIG. 1. In the figure, a printing unit 4 and a security device 3 are provided above the color-developing layer 5. There is. The upper part of the color-developing layer 5 has a laser color-developing region 2 formed by laser irradiation, and the laser color-developing region 2 includes a laser color-developing region 2a that develops color through the transparent protective sheet 6, a transparent protective sheet 6 and a security device 3. There is a laser color-developing portion 2b that develops color through. In the security device 3, the reattachment prevention layer 9 and the optical functional layer 7 on which the diffraction structure 8 is formed are laminated in order from the color developing layer 5 side.

FIG. 3 is another example of a cross-sectional view of the anti-counterfeit structure 1 shown in FIG. 1 in a cross-sectional view taken along the line AA. It differs from the configuration of FIG. 2 in that it is provided with a reattachment detection pattern recording unit 2b'. With such a configuration, the replacement prevention layer 9 also develops color at the same time as the color development of the surface layer of the color development layer 5 by laser irradiation.

FIG. 4 shows another example of a cross-sectional view taken along the line AA of the anti-counterfeit structure 1 shown in FIG. 1, in which the optical functional layer 7 is not provided with the diffraction structure 8 but is formed on the diffraction structure forming layer 10. The point that the diffraction structure 8 is provided is different from the configuration of FIG. In the security device 3, the reattachment prevention layer 9, the diffraction structure forming layer 10, and the optical functional layer 7 are laminated in this order from the color developing layer 5 side.

FIG. 5 is a cross-sectional view showing an example of the anti-counterfeit structure of the present disclosure after forgery and falsification. Specifically, in FIG. 5, the transparent protective sheet 6 and the security device 3 are once peeled off from the anti-counterfeit structure 1 having a cross-sectional structure as shown in FIG. 3, and the laser coloring region 2 on the surface layer of the coloring layer 5 is scraped off. After the transparent protective sheet 6 and the security device 3 are attached again, the re-laser coloring region 11 (11a, 11b, 11b'), which is an illegal facial photographic image, is provided by laser irradiation to prevent counterfeiting. It is sectional drawing of structure 1.

In the example of FIG. 5, since the reattachment detection pattern recording unit 2b'remains on the reattachment prevention layer 9, when printing is performed again by laser irradiation, the reattachment detection pattern recording unit 2b'and the re-laser color development region are obtained. Since 11b'is present in the reattachment prevention layer 9, it is not possible to obtain only the re-laser color development region 11 which is an illegal facial photographic image.

FIG. 6 is a cross-sectional view showing another example of the anti-counterfeit structure of the present disclosure after forgery and tampering. Specifically, in FIG. 6, the transparent protective sheet 6 and the security device 3 are once peeled off from the anti-counterfeit structure 1 having a cross-sectional structure as shown in FIG. 3, and the laser coloring region 2 on the surface layer of the coloring layer 5 is scraped off. Furthermore, after wiping off the reattachment detection pattern recording unit 2b'of the security device 3 with a solvent or the like, the transparent protective sheet 6 and the security device 3 are attached again, and the re-laser color development, which is an illegal facial photographic image, is performed by laser irradiation. It is sectional drawing of the anti-counterfeit structure 1 after the region 11 was provided and forgery was performed. Further, in FIG. 6, since the reattachment prevention layer 9 is removed together with the reattachment detection pattern recording unit 2b', the adhesive layer 12 is newly provided and attached.

In the example of FIG. 6, when the adhesive layer 12 is irradiated with a laser, the adhesive layer 12 does not have a laser coloring property, and the adhesive layer 12 does not develop a color, so that an incorrect facial photograph image can be obtained. However, since the fluorescence emission property has disappeared with the removal of the reattachment prevention layer 9, the fluorescence emission cannot be confirmed even if a dedicated verification machine is used, so that it can be determined to be a fake.

(Color layer)
As the color-developing layer 5 constituting the anti-counterfeit structure 1, a polycarbonate material to which an energy absorber that absorbs laser wavelength light or a heat-sensitive color-changing material is added can be used. For example, SABIC's LEXAN series SD8B94 polycarbonate sheet and the like can be mentioned.

The thickness of the color-developing layer 5 is preferably 50 μm to 500 μm. If the thickness is 50 μm or less, the physical strength of the color-developing layer 5 is insufficient and it is difficult to handle, and wrinkles and the like are likely to occur when the printed portion 4 and the like are provided. On the other hand, when it is 500 μm or more, the influence of the thickness variation and the deflection of the color-developing layer 5 itself during processing tends to be large. A more preferable thickness of the color-developing layer 5 is 75 to 200 μm.

(Printing department)
The printing unit 4 is a layer provided on the entire surface 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 printing unit 4 can be formed by a printing method using ink. As the printing method, known printing methods such as an offset printing method, a gravure printing method, a letterpress printing method, an intaglio printing method, a screen printing method, and an inkjet printing method can be used.

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, as the printing unit 4, 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.

Further, the printing unit 4 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. The printed portion 4 can be formed by fixing the particles.

(Security device)
The security device 3 is configured by laminating an optical function layer 7 and a replacement prevention layer 9. The security device 3 can be provided by being laminated on the color developing layer 5 by a known printing method. The security device 3 is prepared in advance on a support as a transfer foil, and is laminated on the coloring layer 5 by heat pressure or the like. You may.

The security device 3 has the transmission of laser light. Further, it is preferable that the color is not discolored by the laser beam. Further, the security device 3 has the transparency of visible light. This makes it possible to observe the discolored area. The security device 3 preferably transmits near-ultraviolet rays or near-infrared rays. As the laser light having a wavelength of near-ultraviolet rays or near-infrared rays, a solid-state laser having a known luminous efficiency can be used because it is easy to handle and inexpensive.

(Optical functional layer)
The optical functional layer 7 is included in the security device 3. As the optical functional layer 7, a cholesteric liquid crystal or a diffraction structure can be used. The cholesteric liquid crystal has a spiral periodic structure in the direction perpendicular to the molecular axis, and the pitch of the spiral structure establishes an interrelationship with light. As a result, the cholesteric liquid crystal selectively reflects light having a wavelength corresponding to the spiral pitch.

Therefore, when the spiral pitch is controlled by some method and the spiral pitch that reflects the desired light is obtained, the desired reflected color can be produced by immobilizing the spiral structure.

In the present disclosure, it is preferable that the reflected wavelength of the vertically incident light is 750 to 900 nm and the reflected wavelength of the obliquely incident light is 610 to 750 nm. As a result, when visually observed, it is transparent when observed from the front, and when observed from an angle, it is observed in red.

As the cholesteric liquid crystal used in the present disclosure, a compound having a cholesteric structure or having a cholesteric structure under temperature conditions or the like is used, and a known cholesteric liquid crystal material can be used without particular limitation.

For example, as cholesteric liquid crystal forming compounds, main chain type polymer liquid crystals such as acyl derivatives of hydroxyalkyl cellulose, polypeptides, aromatic polyesters, polycarbonates, aromatic polyesterimides, aromatic polyamides and the like conventionally known. A side-chain type polymer liquid crystal liquid crystal forming compound such as a forming compound or a poly (meth) acrylate-based, polymalonate-based, or polysiloxane-based compound is used.

As the hydroxyalkyl cellulose used for the acyl derivative of hydroxyalkyl cellulose, for example, hydroxypropyl cellulose, an acyl derivative of hydroxybutylated hydroxypropyl cellulose and the like are used.

It is necessary to introduce a flexible molecular chain into the side chain with respect to the rigid cellulose molecular main chain portion, and various acyl derivatives are used to control the length, flexibility, rigidity, etc. of the side chain. ..

For example, esters of aliphatic, alicyclic, and aromatic carboxylic acids having about 1 to 30 carbon atoms are preferable. For example, acetic acid, propionic acid, butylic acid, isobutyric acid, valeric acid, isovaleric acid, 2-methylbutyric acid, trimethylacetic acid, caproic acid, heptanic acid, capric acid, nonanoic acid, capric acid, lauric acid, palmitic acid. , Esters of saturated carboxylic acids such as stearic acid and isostearic acid, esters of alicyclic carboxylic acids such as cyclohexanecarboxylic acid, cyclohexylacetic acid, cyclohexanepropionic acid and cyclohexanebutyric acid, benzoic acid, phenylacetic acid and 3-phenylpropionic acid. , 5-Phenyl valeric acid, 4-phenylbutyric acid and other aromatic carboxylic acid esters, and unsaturated carboxylic acid esters such as acrylic acid, methacrylic acid, crotonic acid, maleic acid and itaconic acid are preferred.

In addition, the properties and behavior differ depending on the degree of esterification, and therefore complete esterified products and partially esterified products are used for compound design. In addition, unsaturated carboxylic acid esters can cause a curing (polymerization) reaction together with an energy ray-curable compound used in combination with a liquid crystal compound. Therefore, it is also effective to replace a part of the saturated carboxylic acid, for example, 0.1 to 20% with the unsaturated carboxylic acid for the purpose of cross-linking.

Preferred are hydroxypropyl cellulose acetate, hydroxypropyl cellulose propionic acid ester, hydroxybutylated hydroxypropyl cellulose acetate, hydroxybutylated hydroxypropyl cellulose propionic acid ester, hydroxybutyl cellulose acetate, hydroxybutyl. Hydroxypropyl cellulose acrylic acid ester such as cellulose propionic acid ester, hydroxypropyl cellulose methacrylic acid ester, hydroxybutylated hydroxypropyl cellulose acrylic acid ester, hydroxybutylated hydroxypropyl cellulose methacrylic acid ester, hydroxybutyl cellulose acrylic Complete and partial esters of acid esters, methacrylic acid esters of hydroxybutyl cellulose, acetic acid esters of hydroxypropyl cellulose-methacrylic acid esters, propionic acid esters of hydroxypropyl cellulose-methacrylic acid esters, hydroxybutylated hydroxypropyl cellulose Examples thereof include propionic acid ester-methacrylic acid ester, propionic acid ester of hydroxybutyl cellulose-methacrylic acid ester and the like.

As the cholesteric liquid crystal forming compound, conventionally known low molecular weight and medium molecular weight cholesteric liquid crystal forming compounds are also used alone or in combination with the above-mentioned high molecular weight cholesteric liquid crystal forming compound.

The energy ray-curable compound added to the liquid crystal-forming compound is not particularly limited, and conventionally known energy ray-curable compounds are used, but in particular, two or more energy ray-curable groups are contained in the molecule. It preferably contains a monomer, an oligomer and / or a polymer having the same.

Conventionally known radical photopolymerizable monomers, for example, trimethylolpupantri (meth) acrylate, 1,6-hexanediol di (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth). ) Polyfunctional monomers such as acrylates and dipentaerythritol hexa (meth) acrylates, polyurethane poly (meth) acrylates, polyether poly (meth) acrylates, epoxy resin poly (meth) acrylates, acrylic polyol poly (meth) acrylates. Etc., Polyfunctional oligomers such as are preferable.

Examples of the monofunctional monomer include alkyl (C1 to C18) (meth) acrylate, benzyl (meth) acrylate, cyclohexyl (meth) acrylate, alkylene (C2-C4) glycol (meth) acrylate, and alkoxy (C1 to C10). ) Alkoxy (C2-C4) (meth) acrylate, polyalkylene (C2-C4) glycol (meth) acrylate, alkoxy (C1-C10) polyalkylene (C2-C4) glycol (meth) acrylate and the like. Examples of the cationic photopolymerizable monomer include conventionally known aromatic epoxy compounds, alicyclic epoxy compounds, and glycidyl ester compounds.

Further, as the polymerization initiator or the like used for the cholesteric liquid crystal for causing energy ray curing, a known polymerization initiator having appropriate characteristics depending on the energy ray to be irradiated is used as needed. For example, conventionally known photopolymerization initiators are used. As the radical photopolymerization initiator, known ones such as α-hydroxyacetophenone type, α-aminoacetophenone type and other acetophenone type, benzoin ether type, benzyl ketal type, α-dicarbonyl type and α-acyloxime ester type are used. Specifically, α-aminoacetophenone, acetophenone diethyl ketal, benzyl dimethyl ketal, α-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methylphenylpropanone, benzophenone, Michelers ketone, isopropylthioxanthone, benzophenone and N-methyldiethanolamine. And the like.

As the cationic photopolymerization initiator, a conventionally known one is used alone, and it is also preferable to use it in combination with a sensitizer or a peroxide. For example, allyliodonium salt-α-hydroxyacetophenone system, triallylsulfonium salt system, metallocene compound-peroxide combination system, metallocene compound-thioxanthone combination system, metallocene compound-ant spiral combination system and the like.

In preparing the composition of the cholesteric liquid crystal-forming compound and the energy ray-polymerizable compound, the blending amount is not particularly limited, but for example, 40 to 98 parts by weight of the cholesteric liquid crystal-forming compound, 60 to 2 parts by weight of the energy ray-polymerizable compound, and the like. The blending ratio is 0 to 10 parts by weight of the polymerization initiator, preferably 55 to 95 parts by weight of the cholesteric liquid crystal layer 2 forming compound, 45 to 5 parts by weight of the energy ray polymerizable compound, and 0 to 5 parts by weight of the polymerization initiator. It is a compounding ratio. If necessary, both good solvents can be used as the solubilizing agent. Further, various conventionally known additives can be contained, if necessary.

Further, in order to fix the spiral pitch after applying the cholesteric liquid crystal to the coloring layer, there are a method of rapidly cooling and vitrifying, a method of drying and solidifying the solution, and a method of fixing by irradiating energy. However, known means can be appropriately selected and used as the alignment means and the fixing means.

Further, the thickness is preferably about 0.5 μm to 20 μm in order to obtain the characteristics. Further, the energy ray-curable material and the photopolymerization initiator added to the cholesteric liquid crystal material immobilized by the energy ray irradiation are not particularly limited, and conventionally known materials are used. This compounding ratio is not particularly limited.

At the same time as fixing the spiral pitch of the cholesteric liquid crystal, a plate having an uneven pattern can be pressed to form the diffraction structure 8 on the surface layer of the cholesteric liquid crystal. However, when it is difficult to form a diffraction structure on the cholesteric liquid crystal, it is preferable to provide the diffraction structure forming layer 10 separately from the cholesteric liquid crystal.

As the diffraction structure forming layer 10, a thermoplastic resin, a thermosetting resin, an ultraviolet ray, 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, since the color development area is observed through the security device 3, it is preferably transparent.

As a method for recording the image pattern of the diffraction structure 8, a conventionally known hologram manufacturing method such as an image hologram, a Lipman hologram, a rainbow hologram, or an integral hologram is applied in addition to the two-beam interferometry described above. It is possible.

Further, as for the uneven pattern of the relief type diffraction grating, it is also possible to form a diffraction structure by irradiating the surface of the electron beam curing type resin with an electron beam and exposing it to a striped pattern to be a diffraction grating. In this case, since the interference fringes can be controlled for each line, an arbitrary stereoscopic image or changing image can be recorded in the same manner as the 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 above-mentioned uneven pattern 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, a relief due to unevenness can be formed 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 diffraction structure 8 can be formed by thermocompression bonding the press plate and transferring a fine uneven pattern to the surface of the optical functional layer 7.

(Reflective layer)
A reflective layer may be provided on the forming surface of the diffraction structure 8 in order to enhance the optical effect. Since the laser coloring region 2 is observed through the security device 3, the reflective layer is preferably transparent. Examples of the material include ZnS and TiO ₂ . The reflective layer may be a single layer or a multilayer. In the case of a single layer, the reflective layer can be formed by vapor deposition of a single layer, and in the case of a multilayer, it can be formed by multi-layer vapor deposition capable of sequentially forming a plurality of vapor-deposited films.

(Replacement prevention layer)
Since the reattachment prevention layer 9 has laser color development property, fluorescence color development property, and adhesiveness, it is advisable to appropriately use a material exhibiting each function.

(Laser color development)
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 into the resin. A method of adding an additive to generate heat of the additive and carbonizing the surrounding resin to develop a color is known. An appropriate method may be selected according to the application.

As an additive (laser light absorber) that absorbs laser light in the wavelength range, a material that can absorb laser light and convert it into heat energy can be used. By using a material that can absorb laser light and convert it into heat energy, it is possible to develop a black color by carbonizing the resin around the laser light absorber.

Materials that can absorb laser light and convert it into heat energy include, for example, silicon-containing inorganic compounds, silicon-containing dyes, radiation-absorbing substances such as metal silicates, inorganic fillers such as hydrated alumina, and phosphates. Examples include pigments, non-white titanium acid 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.

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. Moreover, you may use a leuco dye and a color developer.

These materials can be appropriately selected depending on the wavelength range of the laser to be used and the compatibility with the resin, and the addition amount can be appropriately set in consideration of the influence on the energy absorption efficiency and the physical properties of the color-developing sheet color-developing layer.

(Fluorescent emission)
The following materials can be used as materials for imparting fluorescence emission. Examples of the ultraviolet fluorescent substance include Ca ₂ B ₅ O ₃ Cl ^{: Eu 2+} _, Ca WO 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. Inorganic pigments can also be used as the material that imparts fluorescence emission. Among the inorganic pigments, particularly crystalline ones can be used.

For visible phosphors, for example, YF ₃ : YB, Er, ZnS: CuCo, etc., for infrared rays, for example, LiNd _0.9 Yb _0.1 P ₄ O 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 _0.4 ) 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 ₃ (PO ₄ ) ₂ etc. can be selected, and it is appropriately selected in consideration of detection wavelength, dispersibility, emission intensity, safety and the like. Inorganic pigments can also be used as the fluorescent emitter. Among the inorganic pigments, particularly crystalline ones can be used.

For example, it is an example of a composition preferably dispersed in the range of 2 to 15% by weight, preferably 3 to 5% by weight. This makes it possible to see light emission under irradiation with a black lamp (ultraviolet rays) or infrared rays (780 nm or more).

(Adhesiveness)
As the material for imparting adhesiveness, a general adhesive material can be used for formation. For example, vinyl chloride-vinyl acetate copolymer, polyester polyamide, acrylic, butyl rubber, natural rubber, silicon, polyisobutyl adhesive alone, or alkyl methacrylate, vinyl ester, acrylic nitrile, styrene, vinyl monomer. Aggregating components such as unsaturated carboxylic acids, hydroxy group-containing monomers, modifying components typified by acrylic nitrile, and additives such as polymerization initiators, plasticizers, curing agents, curing accelerators, and antioxidants are required. Those added accordingly can be used.

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 (8-4) is appropriately selected depending on the intended use, but is usually about 0.1 to 10 μm, preferably 1 to 5 μm.

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

A security device 3 was provided on the support to prepare a transfer foil, and the security device 3 was provided by spot transfer to the color-developing layer 5 by heat pressure. After that, printing was performed using the printing unit 4 in a laser printing machine, and the transparent protective sheet 6 was hot-pressure laminated to produce the anti-counterfeit structure 1. Then, laser irradiation was performed to obtain a laser coloring region 2.

The transfer foil provided with the security device 3 uses a PET film having a thickness of 25 μm as a support, and a cholesteric liquid crystal ink manufactured by Merck Group is applied as an optical functional layer 7 to a thickness of 4 μm with microgravia, and then the solvent contained in the ink is used. Was volatilized and removed, and then UV was irradiated at 50 mJ / cm ² to fix the spiral pitch.

Next, acrylic urethane was inked as the diffraction structure forming layer 10 and coated to a thickness of 2 μm by gravure printing to volatilize and remove the solvent contained in the ink, and then pressed with a metal cylindrical plate having an uneven relief. A roll formation process was performed by pressing the pressure at 2 Kgf / cm ² , the press temperature at 240 ° C., and the press speed at 10 m / min to form a diffraction structure. Then, ZnS was laminated on the formed diffraction structure surface by a vacuum vapor deposition method.

Then, a polyester ink containing 3% of a phosphor and 3% of a laser emission additive is printed on the reflective layer by gravure printing, the solvent contained in the ink is volatilized and removed, and the layer is laminated as a replacement prevention layer 9. , A transfer foil-ized security device 3 was obtained.

LEXAN SD8B94 100 μm thick (SABIC Co., Ltd.) was used as the color-developing layer 5, and the transfer foil was transferred using a hot stamp transfer machine at a transfer temperature of 120 ° C. and a transfer time of 1 second. A security device 3 was provided in the. Then, the printing unit 4 was printed with an inkjet printer, a transparent protective sheet was overlaid, and after thermal pressure laminating, the printing unit 4 was punched out into a card mold to prepare an anti-counterfeit structure 1. The thermal pressure laminating conditions are a temperature of 200 ° C., a pressure of 80 N / cm ² , and a time of 25 minutes.

Using a laser printing machine (developed product: fiber laser type emission wavelength 1064 nm) on the produced anti-counterfeit structure 1, a laser coloring region 2 is formed on the surface layer of the coloring layer 5, and personal information such as a facial photograph image is printed. did.

When observing the anti-counterfeit structure 1 produced in this way, the laser color development region 2, the security device 3, and the printing unit 4 can be observed at the same time, and by tilting the laser, the laser overlaps with the security device 3. It was observed that the part of the color-developing portion 2b and the portion of the reattachment detection pattern recording portion 2b'shined red.

In an attempt to forge this anti-counterfeit structure 1, the transparent protective sheet 6 and the security device 3 and the coloring layer 5 are once peeled off, the laser coloring region 2 on the surface layer of the coloring layer 5 is scraped off, and the transparent protective sheet 6 is attached again. When different facial photo images were written with a laser printing machine, the replacement detection pattern recording unit 2b'of the 9 parts of the replacement prevention layer could not be erased, and the two facial photo images overlapped as shown in FIG. It was difficult to forge because it was observed.

Further, in an attempt to forge the anti-counterfeit structure 1, the transparent protective sheet 6 and the security device 3 and the coloring layer 5 are once peeled off, and the laser coloring region 2a and the laser coloring portion 2b on the surface layer of the coloring layer 5 are scraped off to obtain a security device. The reattachment detection pattern recording unit 2b'of 3 was also wiped off with a solvent and erased, and when the transparent protective sheet 6 was attached again and a face photograph image was written with a laser printing machine, it was difficult to visually distinguish the forgery. However, when a dedicated verification machine was used, forgery could be confirmed because the fluorescent color development of the 9 parts of the reattachment prevention layer could not be confirmed.

As described above, according to the present disclosure, it is possible to realize an anti-counterfeiting structure in which further security measures are taken to prevent forgery or unauthorized use by falsification of a security device.

The best mode for carrying out the present disclosure has been described above with reference to the accompanying drawings, but the present disclosure is not limited to such a configuration. Within the scope of the invented technical idea of the claims, those skilled in the art can come up with various modified examples and amended examples, and these modified examples and amended examples are also the technical scope of the present disclosure. It is understood that it belongs to.

The anti-counterfeit structure of the present disclosure is not limited to application to cards, passports, etc., if it is applied as a laminated integrated product in which a transfer foil having a security device is enclosed and laser engraved information is applied. do not have.

1 ... Anti-counterfeiting structure, 2 ... Laser color development area, 2a ... Laser color development area, 2b ... Laser color development part, 2b'... Diffraction detection pattern recording part, 3 ... Security device, 4 ... Printing part, 5 ... Color development layer, 6 ... Transparent protective sheet, 7 ... Optical functional layer, 8 ... Diffraction structure, 9 ... Anti-replacement layer, 10 ... Diffraction structure forming layer, 11 ... Relaser color development region, 12 ... Adhesive layer.

Claims (4)

An anti-counterfeit structure in which a security device is arranged on at least a part or the entire surface of a color-developing layer having a laser color-developing portion, and a transparent protective sheet is arranged on the side of the security device opposite to the color-developing layer side. There,
The security device is configured by laminating an optical function layer and a replacement prevention layer.
The anti-replacement layer has adhesiveness and laser alteration.
The laser coloring portion is observed from the transparent protective sheet side through the transparent protective sheet and the security device.
The reattachment prevention layer further includes a reattachment detection pattern recording unit paired with the laser coloring unit.
An anti-counterfeit structure characterized in that the reattachment detection pattern recording unit is observed from the transparent protective sheet side through the transparent protective sheet and the security device . The anti-counterfeit structure according to claim 1, wherein the optical functional layer is a cholesteric liquid crystal that reflects vertically incident infrared light. The anti-counterfeit structure according to claim 1, wherein the anti-replacement layer has fluorescence emission. The anti-counterfeiting structure according to any one of claims 1 to 3 , characterized in that it has been applied for recording individual information in a card or passport.

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