CN101905588A - Light variation anti-forgery element with multiple anti-forgery functions - Google Patents
Light variation anti-forgery element with multiple anti-forgery functions Download PDFInfo
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- CN101905588A CN101905588A CN 200910085852 CN200910085852A CN101905588A CN 101905588 A CN101905588 A CN 101905588A CN 200910085852 CN200910085852 CN 200910085852 CN 200910085852 A CN200910085852 A CN 200910085852A CN 101905588 A CN101905588 A CN 101905588A
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Abstract
The invention provides a light variation anti-forgery element with multiple anti-forgery functions, which is provided with at least one linear photo-polymerization material layer directed at different directions selectively, at least one optical isotropic material layer and at least one metal layer existing at the local part of the anti-forgery element. The anti-forgery element can have a first-line anti-forgery characteristic provided with a hollow-out metal graphic and a second-line anti-forgery characteristic for hidden information and the like identified by a polaroid. On the basis of the anti-forgery characteristics, the anti-forgery element can combine with the light variation effect of color change along with the angle, and the light variation effect of rainbow holography and/or machine-readable identified encoding characteristics, thus realizing organic combination of the first-line, the second-line and a third-line anti-forgery technologies, having the anti-forgery characteristic which is easy for people to recognize and is difficult to forge and higher anti-forgery level, and providing safe and reliable anti-forgery effect for objects provided with the anti-forgery element. The invention also provides an object with the anti-forgery element.
Description
Technical field
The present invention relates to a kind of optical anti-counterfeiting element that is applied to protect valuables, be specifically related to a kind of Security element that integrates metal hollow out literal and the hiding positive negative film feature by polarizer identification with multiple anti-fake function.
Background technology
Security element is generally used for the true and false discriminating to valuables, and the employed anti-counterfeiting technology of Security element with a line anti-counterfeiting characteristic generally includes holographic optical change, watermark, micropore, photochromatic printing ink etc.For example US 6686042 discloses a kind of false proof optically variable pigments that can be used for, and wherein, this pigment has a reflecting layer at least, and the selectively absorbing layers that is positioned at the surface, reflecting layer, is positioned at the dielectric layer on absorbed layer surface, and the absorbed layer that is positioned at the dielectric layer surface.Optically variable pigments with this composite construction can be added in the printing ink easily, is printed onto the surface of valuables in several ways, and the light that shows with the angle variable color becomes effect.From the reflectance spectrum curve of this pigment as can be known, though the light that this pigment has with the angle variable color becomes effect, reverberation wave band broad, be generally mixed light, excitation is not high, and the observed catoptrical aberration of different angles is not obvious, is unfavorable for popular acumen identification.
Security element with two wires anti-counterfeiting characteristic provides deeper false-proof function, can discern by simple tools such as polarizer, magnifying glass, uviol lamps.For example US 2003/0035191A1 discloses a kind of Security element based on the polarised light effect, this element contains light oriented polymeric material layer (PPN), substep exposure through linear polarized uv, the zones of different of optical directional material produces different orientations, on the PPN layer, cover one deck liquid crystal prepolymer (LCP), liquid crystal molecule is arranged and carry out crosslinking curing under action of ultraviolet light along the PPN differently-oriented directivity, formation has optically anisotropic birefringent phase retardation layer, thus record hidden image information.Can observe by polarizer and to hide Info, rotatory polarization sheet or Security element hide Info and are exchanging between positive negative film.
The Security element of the third type is meant the Security element that can only just can decode and differentiate by means of special professional instruments such as spectrometer, petrographic microscopes, for example specialty fibers that adds in the paper, special marking thing, special fluorescent ink, digital coding mark or the like.
Be easy to popular identification though only have the element of a line anti-counterfeiting characteristic at present, also stayed more forgery space simultaneously to the fake producer; And the element that only has two wires or three-way anti-counterfeiting technology, though with high content of technology, the public can't rely on naked eyes to be discerned, and is unfavorable for applying of anti-counterfeiting technology.Along with high-speed development of science and technology, a lot of novel Security elements arise at the historic moment, but can the public be familiar with it and adapt to as early as possible, so that make accurate judgment, is still the problem that needs consideration.Therefore, in order to tackle the continuous expansion of counterfeit, in order to adopt the false proof means of convenient popular identification, Security element must be updated and innovate.And under improved prerequisite,, will be convenient to public's acceptance and identification more if can combine with traditional well-known false proof means.For reaching above-mentioned effect, this Security element at first must make things convenient for the public's naked eyes identification, secondly in conjunction with multiple two wires and three-way antiforge function, increases the technical difficulty of forging.
Summary of the invention
Technical problem solved by the invention is to provide a kind of optically variable anti-counterfeiting element, integrate metal hollow out anti-counterfeiting characteristic and the anti-counterfeiting characteristic of observing by polarizer, to roll into one according to the designed multiple anti-counterfeiting technology of different principle, this Security element is realized the combination of a line anti-counterfeiting characteristic and two wires anti-counterfeiting characteristic, have can quick identification the multiple anti-fake function.
Technical problem solved by the invention also is to provide a kind of valuables that are provided with above-mentioned optically variable anti-counterfeiting element, and by in conjunction with above-mentioned Security element, these valuables have antifalse effect preferably, have reached higher false proof grade.
The present invention at first provides a kind of Security element (optically variable anti-counterfeiting element) with multiple anti-fake function, its have one deck at least different directions selective fixed to linear light polymeric material layer (or claiming oriented layer), one deck optical anisotropic material layer and the metal level that exists at this Security element regional area of one deck at least at least.
Oriented layer is to realize prerequisite of the present invention, the oriented layer that liquid crystal molecule is had good orientation effect, can lower the intermolecular disturbance state of optical anisotropic material (for example liquid crystal material) effectively, thereby guarantee that liquid crystal layer presents the reflection direction of uniformity everywhere, also can make base material reduce to minimum to the influence of liquid crystal layer simultaneously; In addition, oriented layer is the intermediate layer that connects base material and liquid crystal layer, and preferably, oriented layer can realize that forming chemical bond with liquid crystal molecule is connected, thereby can strengthen the adhesion and the mechanical stability of element, and this point is extremely important in the hot transfer printing of element is used.
The present invention obtains the Security element that a line and two wires anti-counterfeiting characteristic combine by oriented layer is combined with an existing line anti-counterfeiting characteristic for the anti-counterfeiting characteristic that the orientation effect of liquid crystal molecule is brought.
In Security element provided by the invention, the acquisition of oriented layer (promptly carry out different directions selective fixed to) can preferably be adopted the polarized ultraviolet alignment method in the present invention by known friction orientation method, polarized ultraviolet alignment method or other method for alignment.Adopt the polarized ultraviolet alignment method both can carry out folk prescription and also can carry out multi-direction orientation, in the present invention, preferably take multi-direction orientation to orientation.
According to concrete technical scheme of the present invention, the linear light polymeric material of forming oriented layer can be selected from disclosed material among US6340506 and the US6201087 etc., and above-mentioned full patent texts is merged to this as a reference.Oriented layer thickness can be controlled between the 10-100nm; In the linear light polymer solution of being prepared when the preparation oriented layer, the concentration of linear light polymeric material can be arranged at substrate surface to form oriented layer with light stereospecific polymer solution by modes such as coating, printings between 1%-8%.
According to concrete technical scheme of the present invention, preferably, the optical anisotropic material layer in the Security element of the present invention is that the liquid crystal prepolymer material with birefringence forms, and liquid crystal molecule is arranged according to the orientation direction of linear light polymeric material layer; More preferably, can carry out directed certain pattern that forms to the linear light polymeric material from different directions according to existing orientation method, after the orientation direction arrangement of liquid crystal material according to the linear light polymeric material, can in above-mentioned liquid crystal material layer (optical anisotropic material layer), form and hide Info, can observe this by polarizer hides Info, when rotatory polarization sheet or Security element, can also observe hides Info changes between positive negative film, thereby makes above-mentioned Security element have the two wires anti-counterfeiting characteristic that hides Info by polarizer identification.
In Security element provided by the invention, the preparation of liquid crystalline polymer layer (being the optical anisotropic material layer) can select technology commonly used in this area to carry out.Preferably, by selecting the liquid crystal molecule in the liquid crystal layer that suitable liquid crystal core feature group and composition form to carry out aligning of different directions being written in advance on the linear light polymeric material layer of graph text information (being oriented layer), realization is to the anisotropisation of light, can observe hiding positive negative film graph text information by means of polarizer, can make the Security element that contains above-mentioned liquid crystal layer have corresponding two wires anti-counterfeiting characteristic.
Security element of the present invention has the hiding positive negative film information that could discern by linear polarizer, and relevant formation and the existing report of preparation method of hiding positive negative film information, for example all have a detailed description among US 6806930, the CN1198241C etc., above-mentioned full patent texts is merged to this as a reference.For instance, the formation method that hides Info can be: at first, the linear photopolymer solution of coating on base material, dry removing desolvated, and forms the linear light polymeric material layer; Then, place the photomask have required picture and text or pattern above coating, shine linear photopolymerization material layer with the linear polarized uv of certain angle, like this, the optical directional material molecule that is mapped to by illumination will be arranged in picture and text and curing; Remove photomask and shine remainder with the linear polarized uv of other angle once more, in linear photopolymerization material layer, just formed different directions selective fixed to film micro area; Then, at linear photopolymerization material laminar surface coating of liquid crystalline pre-polymer solution, dry removing desolvated, under inert atmosphere with ultraviolet light with liquid crystal prepolymer crosslinking curing, liquid crystal molecule with birefringence according to different directions selective fixed to the orientation direction of linear light polymeric material arrange, form the optical anisotropic material layer, hide Info thereby in Security element, be written into.
According to concrete technical scheme of the present invention, preferably, Security element of the present invention can also comprise one deck cholesteric liquid crystal material layer at least, the visible light that this cholesteric liquid crystal material layer-selective reflection has circular polarization character, variation with viewing angle, catoptrical wavelength is also along with variation, when catoptrical wavelength is positioned at visible-range, can make above-mentioned Security element have can naked eyes identification the line anti-counterfeiting characteristic with the angle variable color.
Cholesteryl liquid crystal is a kind of chiral nematic phase liquid crystal with special nature, and the chiral material in the liquid crystalline phase makes and produces helical structure between the liquid crystal molecule, and as shown in Figure 1, wherein, p is a pitch.After a branch of natural daylight entered cholesteric liquid crystal layers, the helical structure that cholesteryl liquid crystal has can optionally reflect the circularly polarized light of specific wavelength (λ) and specific rotation direction.The catoptrical centre wavelength of cholesteric liquid crystal layers depends on the pitch (p) of helical structure, the birefringence and the detection angles of liquid crystal material, and therefore with the variation of detection angles, the catoptrical wavelength of cholesteric liquid crystal layers is also along with variation.If catoptrical centre wavelength is in visible-range, just can realize variation with viewing angle, the catoptrical color of cholesteric liquid crystal layers is also along with variation, and as shown in Figure 2, wherein catoptrical wavelength is positioned at visible-range.When viewing angle transformed to inclination (such as 45 °) from vertical (90 °), catoptrical wavelength moved to the shortwave direction.Therefore, can be according to the design needs, by changing the composition of cholesteryl liquid crystal solution, the cholesteric liquid crystal layers that obtains reflecting the different wave length visible light can form the Security element with different light change effects with this.
Cholesteryl liquid crystal has circular dichroism, the cholesteryl liquid crystal of different chirality features reflects the circularly polarized light of different rotation directions, have the left-handed of same composition and can reflect the left-handed and right-circularly polarized light of different rotation directions respectively with the dextrorotation cholesteryl liquid crystal, the reflectivity of the cholesteric liquid crystal layers of single rotation direction can reach 50%.In technical scheme of the present invention, preferably, Security element of the present invention can also have second liquid crystal material layer of the regional area that is present in the cholesteric liquid crystal material layer.This layer liquid crystal material can exist with the form of pattern.
According to concrete technical scheme of the present invention, preferably, above-mentioned second liquid crystal material layer can be to be formed by the another kind of cholesteric liquid crystal material opposite with the cholesteric liquid crystal material rotation direction that forms the cholesteric liquid crystal material layer.The zone of reflecting the polarised light of certain rotation direction is bright when observing under the polarizer of identical rotation direction, when observing under the polarizer of different rotation directions then is dark, for example: the zone of observing reflection left-hand polarization light with the left-hand polarization sheet, should the zone be bright then, observing the zone of reflecting right-handed polarized light with the left-hand polarization sheet, should the zone be dark then.Overlapping region in the opposite cholesteric liquid crystal material of two kinds of rotation directions, left-handed and right-circularly polarized light to specific wavelength shows as approximate total reflection, reflectivity can reach 100%, and only reflect the circularly polarized light of a certain rotation direction at individual layer cholesteric liquid crystal material layer region, reflectivity is up to 50%, therefore the zones of different of Security element that has comprised two-layer at least cholesteric liquid crystal material layer is to the reflectivity difference of the circularly polarized light of specific wavelength, if observe the cholesteryl liquid crystal zone of this Security element with the circular polarizing disk of a certain rotation direction, observe light and dark pattern, observe the cholesteryl liquid crystal zone with the circular polarizing disk of another rotation direction so, because whole cholesteryl liquid crystal zone is bright entirely, therefore do not observe pattern.
According to concrete technical scheme of the present invention, preferably, above-mentioned second liquid crystal material layer also can be to make the reverberation of cholesteric liquid crystal material layer produce the nematic liquid crystalline material layer of λ/2 phase shifts, in other words, can be chosen in regional area coating one deck nematic liquid crystalline material of cholesteric liquid crystal layers to form second liquid crystal material layer.The thickness difference of nematic liquid crystalline material layer, can make the circularly polarized light of cholesteric liquid crystal material layer reflection through the nematic crystal layer time, produce different phase shift, preferably, in Security element of the present invention, the circularly polarized light of cholesteric liquid crystal material layer reflection produces the phase shift of λ/2 through the nematic liquid crystalline material layer time, promptly change has taken place the rotation direction of circularly polarized light.Equally, this nematic liquid crystalline material also can be coated on the cholesteric liquid crystal material layer with the form of pattern, overlapping region at cholesteric liquid crystal material layer and nematic liquid crystalline material layer, the catoptrical rotation direction of circular polarization is opposite with the catoptrical rotation direction of individual layer cholesteric liquid crystal region circular polarization on every side, circular polarizing disk with a certain rotation direction is observed the cholesteryl liquid crystal zone, can be observed light and dark pattern, circular polarizing disk with another rotation direction is observed the cholesteryl liquid crystal zone, can be observed the pattern opposite with above-mentioned light and shade, promptly Shang Mian " bright " becomes following " secretly ", and top " secretly " becomes following " bright ".
In Security element provided by the invention, preferably, liquid crystalline polymer layer can be that the solution coat by one or more liquid crystal prepolymers, light trigger and solvent composition forms.In the above-mentioned solution, the concentration of liquid crystal prepolymer (w/w) can be between 20%-60%.
According to concrete technical scheme of the present invention, liquid crystal prepolymer of the present invention can be selected from disclosed various liquid crystal prepolymer material among US6806930, US 2003/0035191 and the US5567349, and above-mentioned full patent texts is merged to this as a reference.
In the Security element provided by the present invention, preferably, liquid crystal material in the cholesteric liquid crystal material layer can be identical with the liquid crystal composition in the above-mentioned liquid crystalline polymer layer, just in the liquid crystal polymer solution of preparation cholesteric liquid crystal material layer, added chiral additives, this chiral additives can be selected from US6607677, disclosed various chiral materials (above-mentioned full patent texts is merged to this as a reference) among US6569356 and the US6806930, the content of chiral additives can be controlled between (w/w) 2%-10% that accounts for solid constituent (comprising chiral additives itself).
According to concrete technical scheme of the present invention, the light trigger that is added during the preparation liquid crystal layer can be radical photoinitiator, 184 (1-hydroxycyclohexylphenylketones for example, Changsha Sunyu chemical industry), TPO (2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, Changsha Sunyu chemical industry) and BP (benzophenone, Changsha Sunyu chemical industry), ITX (isopropyl thioxanthone, Changsha Sunyu chemical industry), CTX (2,4-two chlorothiaxanthenones, Ciba company), Irgacure 369 (Ciba company), Irgacure 691 (Ciba company), preferably adopt Irgacure 369; In liquid crystal polymer solution, initiator concentration can be controlled between (w/w) 0.05%-4%.
According to concrete technical scheme of the present invention, optical directional material of the present invention can be selected from disclosed various optical directional materials among US5602661, US6806930 and the US2004265742, and above-mentioned full patent texts is merged to this as a reference.
According to concrete technical scheme of the present invention, when the preparation liquid crystal layer, the solvent that can dissolve above-mentioned material (comprising liquid crystal material, light trigger and/or chiral additives etc.) preferably can use; Preferably, the solvent that is adopted comprises ethyl acetate, methyl phenyl ethers anisole, butanone, acetophenone, parachloroacetophenone, benzophenone, cyclopentanone, cyclohexanone, N, dinethylformamide, N, one or more in N-dimethylacetylamide, methyl-sulfoxide and the piperidyl methyl acid amides etc.; More preferably, above-mentioned solvent comprises one or more in ethyl acetate, methyl phenyl ethers anisole, butanone and the cyclopentanone etc.In liquid crystal polymer solution, the mass fraction of solvent may be controlled to 50%-80%, is preferably 55%-75%.
According to specific embodiments of the present invention, preferably, the thickness of liquid crystalline polymer layer can be controlled between the 0.6-10 μ m.
According to concrete technical scheme of the present invention, metal level is present in the regional area of Security element, and preferably, this metal level is the hollow out metal level.This hollow out metal level can be to adopt existingly to corrode formation with alkali lye then at the local coating of layer on surface of metal protective layer, also can be with metal ink directly printing form; And, both can make metal hollow out literal, also can make the metal pierced pattern, can provide in this way and be easy to the antifalse effect that popular identification is observed, for example: above-mentioned metal level can form characters cut in relief pattern or characters cut in intaglio pattern, thereby makes above-mentioned Security element have a line anti-counterfeiting characteristic of metal hollow picture and text.
According to concrete technical scheme of the present invention, preferably, Security element of the present invention also comprises the contour forging layer, can make above-mentioned Security element have the line anti-counterfeiting characteristic that holo-rainbow light becomes.The technology that the formation of contour forging layer can adopt this area to use always, laser holographic molding technology for example, usually, this contour forging layer can be arranged at metal level below.
In Security element provided by the invention,, form the local pierced pattern of holographic dealuminzation by combining of above-mentioned contour forging layer and localized metallic layer.The preparation of above-mentioned holographic aluminized local pierced pattern can be adopted following method: at first, and at the corrosion resistant protective layer of the local coating of the face of aluminizing of contour forging layer; Then, use certain density alkali lye, for example sodium hydroxide solution erodes unprotected aluminium lamination; With clear water corrosive liquid is cleaned again, formed hollow out literal or pattern; And, in the process of preparation, can be according to the protective layer of design needs at aluminium lamination surface local coating characters cut in relief, the corrosion back forms the pierced pattern of characters cut in intaglio; Perhaps at the protective layer of aluminium lamination surface local coating characters cut in intaglio, the corrosion back forms the pierced pattern of characters cut in relief.The precision of hollow out literal or pattern depend primarily on the printing protective layer the version roller the plate-making precision and to the qualification of etching process, hollow out literal or pattern can be fine to about the limit 0.4mm of naked eyes identification.Present this technology has obtained application on holographic false proof labeling, cigarette anti-counterfeit aureate pullcord and anti-fake safety line.
According to concrete technical scheme of the present invention, preferably, Security element of the present invention also has the dark-background layer that one deck at least contains machine-readable material; More preferably, this dark-background layer be positioned at the cholesteric liquid crystal material layer below.Present cholesteric liquid crystal material itself is transparent mostly, therefore its light change visual effect with the angle variable color is subjected to background influence very big, on irreflexive white or light background, irreflexive diverging light is overlapped on the circularly polarized light of cholesteric liquid crystal layers selective reflecting, makes the visible light of cholesteric liquid crystal layers reflection be difficult to identification.Dark-background can absorb transmitted light, other light that sees through cholesteric liquid crystal layers can be absorbed, the reverberation of cholesteric liquid crystal layers can be identified significantly, therefore, in Security element provided by the invention, cholesteric liquid crystal material is placed on obtains desirable light on the dark-background layer and become effect, more help the popular clear Security element of discerning exactly.
According to concrete technical scheme of the present invention, in order in Security element, to increase new anti-counterfeiting characteristic, improve its false proof grade, preferably, can in the dark ink of printing dark-background layer, add machine-readable material, these machine-readable materials itself can be dark material, it also can be tinted material, and then by in printing ink, adding a series of other auxiliary material, make dark machine-readable printing ink or black ink, the dark-background layer that utilizes this printing ink to make not only can make Security element have desirable light change effect, and two wires machine-readable anti-false feature can also be provided simultaneously.
According to concrete technical scheme of the present invention, preferably, the machine-readable material that is contained in the dark-background layer of Security element of the present invention comprises one or more in retentive material, soft magnetic material, infrared absorbing material, infrared reflective material and the fluorescent material etc.Dark-background layer in the Security element provided by the invention can be to be printed to by the dark ink that contains a kind of machine-readable material, also can be to form by chromatography by the multiple dark ink that contains different machine-readable materials, preferably, above-mentioned printing ink can form the form of coding.The above-mentioned dark-background layer that is provided with coding can be called the coding layer, the assembly coding layer of one or more materials in magnetic material, infrared signature material and the fluorescent material etc. can be, also one or more materials in magnetic material, infrared signature material and the fluorescent material etc. coding of forming and the assembly coding layer that does not possess the common material of security feature can be.These codings are and hide Info, and need discern detection by relevant proprietary detecting instrument, can make the Security element that contains above-mentioned coding layer have the antifalse effect of specialty more.
Security element provided by the invention has sandwich construction, can as required different layers be placed the homonymy or the heteropleural of base material, and the performance of the anti-circulation of collateral security Security element of the present invention considers that preferably, each layer is arranged at the homonymy of base material.Each layer of the present invention can moulding on base material separately, is combined with each other then; Preferably, can between coating and base material, peel ply be set, treat each coating composite molding after, base material is peeled off.
Security element of the present invention can be on the basis of a line anti-counterfeiting characteristic, in conjunction with multiple two wires, three-way anti-counterfeiting characteristic, has the antifalse effect that is easy to popular identification and higher false proof grade, is particularly useful for the false proof of valuables.Also can be provided with protective layer on the metal level of Security element provided by the invention, liquid crystal layer or the machine-readable material layer (dark-background layer).For the benefit of being arranged on needs on the false proof article, and the surface that this element combines with article also preferably is provided with adhesive layer, is used for element and article are combined.As optimized technical scheme; the metal level of Security element provided by the invention, hologram layer, liquid crystal layer and dark-background layer are positioned at the homonymy of base material; be provided with protective layer at coating surface; be beneficial to the anti-trafficability performance that improves anti-counterfeiting characteristic; the surface that element combines with article is provided with adhesive layer; and employed protective layer and adhesive layer material can determine that its embodiment all can for example be coated corresponding aspect according to conventional method according to the concrete property of different materials.
According to concrete technical scheme of the present invention, Security element of the present invention can comprise following concrete structure: different directions selective fixed to the linear light polymeric material layer, the optical anisotropic material layer that molecule is arranged according to the orientation direction of linear light polymeric material layer, the cholesteric liquid crystal material layer of selective reflecting circular polarization visible light, the contour forging layer, the metal level that regional area exists, and the dark-background layer that contains machine-readable material; Preferably, above-mentioned Security element can also be included in second liquid crystal material layer of the regional area existence of cholesteric liquid crystal material layer.In above-mentioned Security element, position relation between each layer can be: metal level-contour forging layer-substrate layer-linear light polymeric material layer-optical anisotropic material layer-cholesteric liquid crystal material layer-dark-background layer, and second liquid crystal material layer can be between cholesteric liquid crystal material layer and the dark-background layer or between optical anisotropic material layer and the cholesteric liquid crystal material layer; Position relation between each layer also can be: substrate layer-contour forging layer-metal level-linear light polymeric material layer-optical anisotropic material layer-cholesteric liquid crystal material layer-dark-background layer, second liquid crystal material layer can be between cholesteric liquid crystal material layer and the dark-background layer or between optical anisotropic material layer and the cholesteric liquid crystal material layer.
According to concrete technical scheme of the present invention, the base material that is suitable for being coated with various solution of the present invention, printing ink and glue is preferably transparent plastic, for example materials such as PE, PP, PET, PS, PVC and BOPP; The mode of the various materials of coating can be known coating method on base material, for example can adopt modes such as silk rod, heliogravure, gentle version, offset printing or silk screen that various solution, printing ink and glue etc. are coated on respectively on the transparent plastic substrate, and by suitable manner drying or directional solidification.
The present invention is by being incorporated into multiple anti-counterfeiting characteristic in the same Security element, realized the compound of a line, two wires and/or three-way anti-counterfeiting characteristic, thereby obtained a kind of Security element with multiple anti-fake function, for this Security element, both can discern by naked eyes, can verify by simple tools or professional instrument again, and this Security element is difficult to be forged.
The present invention also provides a kind of valuables that are provided with above-mentioned Security element, and more valuable article can include valency license, commodity sign or commodity packaging etc.Wherein, above-mentioned have the valency license to comprise banknote, stock, certificate, check, credit card, identity card, passport, admission ticket or air ticket etc.
Above-mentioned Security element can be to be arranged on the valuables in modes such as opened window safety line, pad pasting or decals, is convenient to the public or specialized department the true and false of article is detected identification.
In sum, the present invention is by having prepared the optically variable anti-counterfeiting element with multiple anti-fake function with different anti-counterfeiting characteristic combinations, this Security element can contain by the hollow out dealuminzation form hollow out literal or pattern the localized metallic layer, different directions selective fixed to linear light polymeric material layer and the molecule liquid crystalline polymer layer of arranging according to the orientation direction of linear light polymeric material, this Security element can have a line anti-counterfeiting characteristic of hollow out metal picture and text and simultaneously by two wires anti-counterfeiting characteristics such as hiding Info of polarizer identification.On this basis, Security element of the present invention can also have the cholesteric liquid crystal material layer that can produce with the angle color changeable effect, provide and be convenient to observe cholesteric liquid crystal material and become the dark-background layer that contains machine-readable material of effect and/or contain to have with the angle variable color light and produce the holographic optics layer and/or second liquid crystal layer that the rainbow continuous spectrum changes, thereby makes Security element become effect, hiding Info and the coding characteristic of machine-readable identification by polarizer identification in conjunction with become effect, hollow out information, holo-rainbow light with the angle variable color light simultaneously.Security element provided by the present invention can be realized a line and two wires anti-counterfeiting technology, or even the combination of a line, two wires and three-way anti-counterfeiting technology, has the anti-counterfeiting characteristic that not only is easy to popular identification but also is difficult to counterfeit forgery, have very high false proof grade, safe and reliable antifalse effect can be provided for the article that are provided with this Security element.By compound multiple anti-counterfeiting characteristic in same Security element, can also satisfy the false proof demand of different user simultaneously.
Description of drawings
Fig. 1 is the helical structure schematic diagram of cholesteric liquid crystal material;
Fig. 2 is the variation of cholesteric liquid crystal material layer with viewing angle, and catoptrical wavelength is along with the spectrogram that changes;
Fig. 3 is optically variable anti-counterfeiting element of the present invention is used for bank-note paper respectively with the form of opened window safety line and decals a schematic diagram;
Fig. 4 is the structural representation of the optically variable anti-counterfeiting element that provides of embodiment 1;
Fig. 5-the 1st, the structural representation of the optically variable anti-counterfeiting element that embodiment 2 provides;
Fig. 5-the 2nd, the hollow out metal level characters cut in intaglio text effects schematic diagram of the Security element that embodiment 2 provides;
Fig. 6 is the structural representation of the optically variable anti-counterfeiting element that provides of embodiment 3;
Fig. 7 is the structural representation of the optically variable anti-counterfeiting element that provides of embodiment 4;
Fig. 8 is the structural representation of the optically variable anti-counterfeiting element that provides of embodiment 5.
The specific embodiment
Below in conjunction with specific embodiment the solution of the present invention, characteristics and false proof effect are carried out exemplary illustration, but practical range of the present invention is not constituted any qualification.
In an embodiment of the present invention, during preparation liquid crystal polymer solution, the various materials that adopted can be selected the disclosed corresponding material of US 2003/0035191A1 for use, wherein, the structural formula of liquid crystal prepolymer material is suc as formula shown in I-1, I-2 and the I-3, the structural formula of chiral additives is suc as formula shown in the II, and the structural formula of optical directional material (LPP) is shown in formula III:
Print characters cut in intaglio pattern with metal ink in the mode of heliogravure on PET base material (substrate layer) 1 surface, form characters cut in intaglio literal " PEOPLE ", drying forms localized metallic layer (hollow out metal level) 2;
With concentration be 2% LPP (molecule formula III) solution coat in the another side of base material, drying about 50nm, forms the linear light polymeric material layer with THICKNESS CONTROL; Then, place the photomask contain characters cut in relief literal " CHINA " above coating, shine linear photopolymerization material layer with the linear polarized uv of certain angle, like this, the optical directional material molecule that is mapped to by illumination will be arranged in picture and text and curing; Remove photomask then and shine remainder with the linear polarized uv of other angle once more, in linear photopolymerization material layer, just formed different directions selective fixed to the anisotropic microstructure zone, form the optical directional material layer (promptly different directions selective fixed to the linear light polymeric material layer) 3;
Liquid crystal prepolymer material I-1, I-2, I-3 are at room temperature mixed, the part by weight of three kinds of liquid crystal prepolymer material is I-1: I-2: I-3=80: 15: 5, and in mixture, add Irgacure 369 light triggers of 2% percentage by weight, with concentration and viscosity that methyl phenyl ethers anisole is regulated the liquid crystal pre-polymer solution, the needs that can satisfy smooth coating get final product; The liquid crystal pre-polymer solution for preparing is coated on optical directional material layer 3 surface, dry, crosslinking curing under nitrogen protection subsequently, the THICKNESS CONTROL of liquid crystal layer is at 1.1um, liquid crystal molecule with birefringence according to different directions selective fixed to the orientation direction of linear light polymeric material arrange, hide Info thereby in Security element, be written into, form liquid crystalline polymer layer (being the optical anisotropic material layer) 4;
At the surperficial chromatography black magnetic toner (forming magnetic regions 181) of localized metallic layer and the light infrared printing ink (forming region of ultra-red 182) that the different-waveband absorption of electromagnetic wave is had obvious contrast, the corresponding metal level of black magnetic layer wherein, the corresponding characters cut in intaglio character area of light color infrared printing ink layer, form the alternate machine-readable material layer (background layer that the depth is alternate) 8 of the depth, the final Security element that forms as shown in Figure 4, its structure is successively: the machine-readable material layer 8 of liquid crystalline polymer layer 4-optical directional material layer 3-substrate layer 1-localized metallic layer 2-.
The Security element of present embodiment has following antifalse effect: the Security element of perusal present embodiment under transmitted light, can see characters cut in intaglio metal character " PEOPLE "; Observe this Security element with linear polarizer, can see hidden text " CHINA ", rotatory polarization sheet or this Security element, hidden text can exchange between positive negative film effect, and, the corresponding complementary information literal that forms " CHINA PEOPLE " of hidden text " CHINA " with characters cut in intaglio literal " PEOPLE "; Can detect the magnetic code of magnetic regions 181 by magnetism detector, can be observed the image-forming information of region of ultra-red 182 by infrared identifier at the strong electromagnetic wave band that absorbs of infra-red material, do not have the image-forming information of region of ultra-red 182 at the electromagnetic wave band of infra-red material strong reflection.
The Security element that present embodiment provides combines a line (fine metal literal), two wires (with the hidden text information of polarizer identification) and three-way (by the magnetic code and the infrared information of specialized equipment identification) anti-counterfeiting characteristic.
Surperficial at the aluminium coated of the BOPP base material (substrate layer) 1 of aluminizing by the photogravure protective layer, will not protect the aluminium lamination of part to erode with alkali lye then, use the clear water cleaning, drying, can see characters cut in intaglio literal " CBPMC ", form localized metallic layer 2;
Form optical directional material layer 3 and liquid crystalline polymer layer 4 on metal level 2 surfaces according to the coating of similarly to Example 1 technology mode, in liquid crystalline polymer layer 4, be written into hide Info " CHINA ";
At the another side of BOPP base material 1 coating cholesteryl liquid crystal solution, dry removing desolvated, under inert atmosphere with ultraviolet light with the cholesteryl liquid crystal crosslinking curing, form cholesteric liquid crystal layers 6;
Surperficial chromatography appearance color in cholesteric liquid crystal layers 6 is identical then; the absorption of different near-infrared electromagnetic ripples is had the dark infrared printing ink A of obvious contrast and B, and (containing near-infrared electromagnetic ripple to S-band among the INFRARED ABSORPTION printing ink A has more by force and absorbs; the infra-red material A that the near-infrared electromagnetic ripple of T wave band is had stronger reflection; the near-infrared electromagnetic ripple that contains among the printing ink B S-band has than strong reflection; the infra-red material B that the near-infrared electromagnetic ripple of T wave band is had stronger absorption); dry; wherein contain fluorescent material among the infrared printing ink A; form machine-readable material layer (dark-background layer) 8; finally form the Security element shown in Fig. 5-1, its structure is successively: liquid crystalline polymer layer 4-optical directional material layer 3-protective layer and the machine-readable material layer 8 of metal level 2-substrate layer 1-cholesteric liquid crystal layers 6-.
The Security element of present embodiment has following antifalse effect: the Security element of perusal present embodiment, can see characters cut in intaglio metal character " CBPMC ", and text effects is shown in Fig. 5-2; Cholesteric liquid crystal layers 6 is owing to blocked by localized metallic zone 211, only can be observed difference with viewing angle at openwork part 222, and tangible change can take place the appearance color of cholesteric liquid crystal layers 6, such as changing to green from yellow; Observe this Security element with linear polarizer, can see hidden text " CHINA ", rotatory polarization sheet or Security element, hidden text can exchange between positive negative film effect, and, the corresponding complementary information literal that forms " CHINA CBPMC " of hidden text " CHINA " with metal character " CBPMC "; Can be observed the image-forming information in the zone of containing dark infrared printing ink A in the S-band of infrared identifier, can be observed the image-forming information in the zone of containing dark infrared printing ink B at the T wave band; Under uviol lamp, can be observed the visible light that the zone of containing dark infrared printing ink A is inspired.
The Security element that present embodiment provides combines a line (fine metal literal and with the angle variable color), two wires (with the hidden text information of polarizer identification and the visible light that goes out through ultraviolet excitation) and three-way (infrared information of discerning by specialized equipment) anti-counterfeiting characteristic.
At PET base material (substrate layer) 1 surface coating contour forging glue, the dry embossed plies that forms is processed embossed plies with the mold pressing version, and at embossed plies surface evaporation aluminium lamination, forming Word message is the hologram layer 5 of " BANK " then;
Surperficial at aluminium lamination then by the photogravure protective layer, will not protect the aluminium lamination of part to erode with alkali lye, use the clear water cleaning, drying, forming Word message is the localized metallic layer 2 of " PEOPLE ";
Be coated with by similarly to Example 1 mode at the another side of PET base material 1 and form optical directional material layer 3 and liquid crystalline polymer layer 4, in liquid crystalline polymer layer 4, be written into hide Info " CHINA ";
Form cholesteric liquid crystal layers 6 on liquid crystalline polymer layer 4 surfaces by similarly to Example 2 mode, then at identical Hard Magnetic printing ink and the soft magnetism printing ink of cholesteric liquid crystal layers 6 surperficial chromatography appearance colors, form the machine-readable material layer (dark-background layer) that Hard Magnetic zone 381 and soft magnetism zone 382 constitute, final formation Security element shown in Figure 6, its structure is successively: the machine-readable material layer of metal level 2-hologram layer 5-substrate layer 1-optical directional material layer 3-liquid crystalline polymer layer 4-cholesteric liquid crystal layers 6-; For ease of illustrative, the Hard Magnetic zone that appearance color is identical among Fig. 6 is represented with different dark colors with the soft magnetism zone.
The Security element of present embodiment has following antifalse effect: the Security element of perusal present embodiment, can see the metal character " PEOPLE " of characters cut in intaglio or characters cut in relief; Cholesteric liquid crystal layers 6 is owing to blocked by localized metallic zone 311, only can be observed difference with viewing angle at openwork part 322, and tangible change can take place the appearance color of cholesteric liquid crystal layers 6, such as changing to blueness from green; Can be observed rainbow holography literal " BANK " by naked eyes; Observe Security element with linear polarizer, can see hidden text " CHINA ", rotatory polarization sheet or Security element, hidden text can exchange between positive negative film effect, and, the corresponding complementary information literal that forms " CHINA PEOPLEBANK " of hidden text, metal character and holographic character; Can detect the pairing magnetic code in Hard Magnetic zone 381 and soft magnetism zone 382 by magnetism detector.
The Security element that present embodiment provides combines a line (fine metal literal, holographic character and with the angle variable color), two wires (with the hidden text information of polarizer identification) and three-way (the hard soft magnetism by specialized equipment identification match magnetic code) anti-counterfeiting characteristic.
The Security element of present embodiment has following antifalse effect: the Security element of perusal present embodiment, can see the metal character of characters cut in intaglio or characters cut in relief; Can be observed rainbow holography information by naked eyes; Cholesteric liquid crystal layers 6 is owing to blocked by localized metallic zone 411, only can be observed different with viewing angle at openwork part 422 and 433, and tangible change can take place the appearance color of cholesteric liquid crystal layers 6; Observe Security element with linear polarizer, can see hidden text, rotatory polarization sheet or Security element, hidden text can exchange between positive negative film effect; The circularly polarized light of a certain rotation direction of cholesteric liquid crystal layers 6 reflections, owing to produce the phase shift of λ/2 during the circularly polarized light process nematic crystal layer 7 of cholesteric liquid crystal layers 6 reflections, change has taken place in the rotation direction that is circularly polarized light, when observing Security element with the circular polarizing disk of a certain rotation direction, because the circularly polarized light of zone 422 and the different rotation directions of 433 reflections, therefore can be observed the pattern that zone 422 and 433 produces the light and shade contrast, when observing Security element, can be observed zone 422 and 433 and produce and the opposite pattern of above-mentioned light and shade contrast with the circular polarizing disk of another rotation direction; Each wave band at infrared identifier, can be observed by image-forming information the printed zone of the INFRARED ABSORPTION printing ink C of near-infrared electromagnetic ripple hypersorption, but only at the absorption bands of infrared printing ink D, can be observed the image-forming information in the printed zone of infrared printing ink D, then do not have this regional image-forming information at other wave band.
The Security element that present embodiment provides combines a line (fine metal literal, holographic character and with the angle variable color), two wires (with the hiding positive negative film information and the hiding Info with circular polarizing disk identification of linear polarizer identification) and three-way (infrared information of discerning by specialized equipment) anti-counterfeiting characteristic.
The Security element of present embodiment has following antifalse effect: the Security element of perusal present embodiment, can see the metal character of characters cut in intaglio or characters cut in relief; Can be observed rainbow holography information by naked eyes; Cholesteric liquid crystal layers 6 is owing to blocked by localized metallic zone 511, only can be observed different with viewing angle at openwork part 522 and 533, and tangible change can take place the appearance color of cholesteric liquid crystal layers 6; Observe Security element with linear polarizer, can see hidden text, rotatory polarization sheet or Security element, hidden text can exchange between positive negative film effect; The circularly polarized light of a certain rotation direction of zone 533 reflections, overlapping region 522 is reflected left-handed and circularly polarized light dextrorotation simultaneously, circular polarizing disk with a certain rotation direction is observed the cholesteryl liquid crystal zone, can be observed zone 522 and be dark alternate pattern for bright and regional 533, circular polarizing disk with another rotation direction is observed the cholesteryl liquid crystal zone, because zone 522 and 533 is bright entirely, therefore do not observe image; At each wave band of infrared identifier, the image-forming information in the printed zone of no infrared external reflection printing ink E, but, can be observed the image-forming information in the printed zone of infrared printing ink D at the absorption bands of infrared printing ink D, then there is not this regional image-forming information at other wave band.
The Security element that present embodiment provides combines a line (fine metal literal, holographic character and with the angle variable color), two wires (with the hiding positive negative film information and the hiding Info with circular polarizing disk identification of linear polarizer identification) and three-way (infrared information of discerning by specialized equipment) anti-counterfeiting characteristic.
Information Level (dark-background layer) surface coating protective layer and adhesive layer at the Security element of embodiment 5 cut into pad pasting 63 with element, then with component affixing in cheque paper; Protective layer can effectively be protected the patience of liquid crystal information layer in the process of circulation; Perhaps also can be at the information layer surface coating protective layer and the adhesive layer of the Security element of embodiment 5; at the another side coating adhesive-layer of base material, element is cut into safety line 62 simultaneously, then safety line is attached in paper-making process in the bank-note paper 61; form opened window safety line, as shown in Figure 3.
Claims (14)
1. Security element with multiple anti-fake function, it is characterized in that, this Security element have one deck at least different directions selective fixed to the linear light polymeric material layer, one deck optical anisotropic material layer and the metal level that exists at this Security element regional area of one deck at least at least.
2. Security element as claimed in claim 1 is characterized in that, described optical anisotropic material layer is to be formed by the liquid crystal material with birefringence, and liquid crystal molecule is arranged according to the orientation direction of described linear light polymeric material layer.
3. Security element as claimed in claim 1 or 2 is characterized in that, this Security element also has one deck cholesteric liquid crystal material layer at least, the visible light that this cholesteric liquid crystal material layer-selective reflection has circular polarization character.
4. Security element as claimed in claim 1 is characterized in that, described metal level is the hollow out metal level, forms characters cut in relief pattern or characters cut in intaglio pattern.
5. as claim 1 or 4 described Security elements, it is characterized in that this Security element also has the contour forging layer.
6. Security element as claimed in claim 1 is characterized in that, this Security element also has the dark-background layer that one deck at least contains machine-readable material.
7. Security element as claimed in claim 6 is characterized in that, described machine-readable material comprises one or more in retentive material, soft magnetic material, infrared absorbing material, infrared reflective material and the fluorescent material.
8. Security element as claimed in claim 3 is characterized in that, this Security element also has second liquid crystal material layer that is present in described cholesteric liquid crystal material layer regional area.
9. Security element as claimed in claim 8 is characterized in that, described second liquid crystal material layer is to be formed by the another kind of cholesteric liquid crystal material opposite with the cholesteric liquid crystal material rotation direction that forms described cholesteric liquid crystal material layer.
10. Security element as claimed in claim 8 is characterized in that, described second liquid crystal material layer is to make the reverberation of described cholesteric liquid crystal material layer produce the nematic liquid crystalline material layer of λ/2 phase shifts.
11. Security element as claimed in claim 1, it is characterized in that, this Security element be included in different directions selective fixed to the linear light polymeric material layer, the optical anisotropic material layer that molecule is arranged according to the orientation direction of linear light polymeric material layer, the cholesteric liquid crystal material layer of selective reflecting circular polarization visible light, the contour forging layer, the metal level that regional area exists, and the dark-background layer that contains machine-readable material.
12. Security element as claimed in claim 11 is characterized in that, this Security element also is included in second liquid crystal material layer that described cholesteric liquid crystal material layer regional area exists.
13. valuables that are provided with Security element is characterized in that, described Security element is each described Security element of claim 1-12.
14. valuables as claimed in claim 13 is characterized in that, these valuables comprise marketable securities, commodity sign or commodity packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910085852 CN101905588A (en) | 2009-06-03 | 2009-06-03 | Light variation anti-forgery element with multiple anti-forgery functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910085852 CN101905588A (en) | 2009-06-03 | 2009-06-03 | Light variation anti-forgery element with multiple anti-forgery functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101905588A true CN101905588A (en) | 2010-12-08 |
Family
ID=43261240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910085852 Pending CN101905588A (en) | 2009-06-03 | 2009-06-03 | Light variation anti-forgery element with multiple anti-forgery functions |
Country Status (1)
| Country | Link |
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| CN (1) | CN101905588A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514408A (en) * | 2011-11-03 | 2012-06-27 | 西安西正印制有限公司 | Method for printing colored anti-counterfeiting image by colorless fluorescent ink |
| CN103874941A (en) * | 2011-09-21 | 2014-06-18 | 富士胶片株式会社 | Object including latent image |
| CN105599428A (en) * | 2016-03-05 | 2016-05-25 | 郑树川 | Rainbow film forming process and apparatus |
| CN105793058A (en) * | 2013-12-11 | 2016-07-20 | 锡克拜控股有限公司 | Optically variable security threads and stripes |
| CN107038950A (en) * | 2017-06-07 | 2017-08-11 | 公安部第研究所 | A kind of color-changing anti-counterfeit mark |
| CN107102392A (en) * | 2017-06-09 | 2017-08-29 | 上海先幻新材料科技有限公司 | A kind of optical anti-counterfeiting film apparatus |
| CN107132607A (en) * | 2017-06-09 | 2017-09-05 | 先尼科化工（上海）有限公司 | Optical anti-counterfeiting film apparatus |
| CN107300734A (en) * | 2017-06-09 | 2017-10-27 | 先尼科化工（上海）有限公司 | Optical anti-counterfeiting film apparatus |
| CN107771129A (en) * | 2015-06-15 | 2018-03-06 | 蒂萨斯克里博斯有限责任公司 | Safety label with gap tilt effect |
| CN107861186A (en) * | 2017-12-11 | 2018-03-30 | 南京先进激光技术研究院 | Optical polarization false-proof film and the method for inspection based on liquid crystal aligning technology |
| CN109733030A (en) * | 2019-02-26 | 2019-05-10 | 公安部第一研究所 | A kind of high safety card and preparation method thereof |
| CN112859216A (en) * | 2021-01-14 | 2021-05-28 | 北京科技大学 | Multilayer thin film structure with significant directionally selective emissivity |
| CN112874202A (en) * | 2021-01-11 | 2021-06-01 | 中钞印制技术研究院有限公司 | Method for producing a security element and security element |
| CN114574028A (en) * | 2022-02-22 | 2022-06-03 | 惠州市华阳光学技术有限公司 | Anti-counterfeiting pigment composition and preparation method thereof |
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| CN103874941A (en) * | 2011-09-21 | 2014-06-18 | 富士胶片株式会社 | Object including latent image |
| CN102514408A (en) * | 2011-11-03 | 2012-06-27 | 西安西正印制有限公司 | Method for printing colored anti-counterfeiting image by colorless fluorescent ink |
| CN105793058B (en) * | 2013-12-11 | 2018-07-10 | 锡克拜控股有限公司 | Safety line or item and its manufacturing method and purposes, secure file and its manufacturing method |
| CN105793058A (en) * | 2013-12-11 | 2016-07-20 | 锡克拜控股有限公司 | Optically variable security threads and stripes |
| US10166808B2 (en) | 2013-12-11 | 2019-01-01 | Sicpa Holding Sa | Optically variable security threads and stripes |
| US10618341B2 (en) | 2015-06-15 | 2020-04-14 | Tesa Scribos Gmbh | Security label with tilt effect |
| CN107771129B (en) * | 2015-06-15 | 2020-02-07 | 蒂萨斯克里博斯有限责任公司 | Security tag with tilting effect |
| CN107771129A (en) * | 2015-06-15 | 2018-03-06 | 蒂萨斯克里博斯有限责任公司 | Safety label with gap tilt effect |
| CN105599428A (en) * | 2016-03-05 | 2016-05-25 | 郑树川 | Rainbow film forming process and apparatus |
| CN107038950A (en) * | 2017-06-07 | 2017-08-11 | 公安部第研究所 | A kind of color-changing anti-counterfeit mark |
| CN107300734A (en) * | 2017-06-09 | 2017-10-27 | 先尼科化工（上海）有限公司 | Optical anti-counterfeiting film apparatus |
| CN107132607A (en) * | 2017-06-09 | 2017-09-05 | 先尼科化工（上海）有限公司 | Optical anti-counterfeiting film apparatus |
| CN107102392A (en) * | 2017-06-09 | 2017-08-29 | 上海先幻新材料科技有限公司 | A kind of optical anti-counterfeiting film apparatus |
| CN107102392B (en) * | 2017-06-09 | 2019-08-27 | 上海先幻新材料科技有限公司 | A kind of optical anti-counterfeiting film apparatus |
| CN107861186A (en) * | 2017-12-11 | 2018-03-30 | 南京先进激光技术研究院 | Optical polarization false-proof film and the method for inspection based on liquid crystal aligning technology |
| CN109733030A (en) * | 2019-02-26 | 2019-05-10 | 公安部第一研究所 | A kind of high safety card and preparation method thereof |
| CN112874202A (en) * | 2021-01-11 | 2021-06-01 | 中钞印制技术研究院有限公司 | Method for producing a security element and security element |
| CN112859216A (en) * | 2021-01-14 | 2021-05-28 | 北京科技大学 | Multilayer thin film structure with significant directionally selective emissivity |
| CN112859216B (en) * | 2021-01-14 | 2021-11-30 | 北京科技大学 | Multilayer thin film structure with significant directionally selective emissivity |
| CN114574028A (en) * | 2022-02-22 | 2022-06-03 | 惠州市华阳光学技术有限公司 | Anti-counterfeiting pigment composition and preparation method thereof |
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Application publication date: 20101208 |