WO2017181442A1 - Élément anti-contrefaçon optique et produit anti-contrefaçon optique - Google Patents

Élément anti-contrefaçon optique et produit anti-contrefaçon optique Download PDF

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Publication number
WO2017181442A1
WO2017181442A1 PCT/CN2016/080896 CN2016080896W WO2017181442A1 WO 2017181442 A1 WO2017181442 A1 WO 2017181442A1 CN 2016080896 W CN2016080896 W CN 2016080896W WO 2017181442 A1 WO2017181442 A1 WO 2017181442A1
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Prior art keywords
optical
region
security element
sub
layer
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PCT/CN2016/080896
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English (en)
Chinese (zh)
Inventor
张丛
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深圳市樊溪电子有限公司
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Publication of WO2017181442A1 publication Critical patent/WO2017181442A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms

Definitions

  • the present invention relates to the field of optical security, and in particular to an optical security element and an optical security product using the optical security element.
  • optical anti-counterfeiting technology is widely used in various high-security or high-value-added printed matter such as banknotes, cards, and product packaging, and has achieved very good results.
  • multi-layer structure coating technology has been widely used for public anti-counterfeiting of high security securities such as banknotes. It can present various color features or can display different colors under different viewing angles for easy description. It is easy to identify by the public and cannot be copied or copied by electronic devices such as cameras, scanners, printers, etc., so it has high anti-counterfeiting capability.
  • Patterning and multi-coloring on the basis of multi-layer coating is the development direction to improve the anti-counterfeiting ability of multi-layer structure plating.
  • Swiss SICPA has developed a variable optical pigment (OVP) by pulverizing a five-layer optically altered coating structure with a symmetrical structure to obtain an optically variable ink (OVI), which can be combined with printing technology and has been widely used in various banknotes around the world. application.
  • OVI optically variable magnetic ink
  • an optically variable magnetic ink (OVMI) or SPARK technology is formed by adding a magnetic layer to the existing optically variable structure, which enables the OVMI particles to be aligned along the magnetic line direction by magnetic field induction. Thereby forming a specific graphic structure.
  • the particle arrangement in OVMI has a specific regular change, optical characteristics such as motion and zoom can be generated (see US Pat. No. 7,517,7878 B2).
  • the directional arrangement of the optically variable magnetic particles needs to rely on the magnetic field, it is restricted by the shape of the magnetic field, and the shape cannot be arbitrarily designed, and a specific orientation device and process are required.
  • interferometric multi-layer coatings combine with holographic, color matching and other technologies to provide new security features.
  • the integration of such technologies is complicated and the effect is not satisfactory.
  • the improvement of the anti-counterfeiting capability of the interference multi-layer coating is still limited.
  • the invention provides an optical security element, the optical security element comprising:
  • the sub-wavelength surface microstructure and the surface-covered multilayer structure coating form a first optical feature, and the coverage area is a first region;
  • optically reflective facet structure and the surface-covered multilayer structure coating form a second optical feature, the coverage area being the second region;
  • the optical characteristics of the first region are different from the optical features of the second region
  • the optical scattering features provided by the substantially random variations distributed in the two-dimensional plane in which they are located according to the orientation of the optical facets, and/or according to the orientation of the selected optical facets
  • the two regions can be perceived by the viewer as surfaces that protrude forward and/or backward relative to their actual spatial shape.
  • an optical security element includes:
  • the sub-wavelength surface microstructure and the surface-covered multilayer structure coating form a first optical feature, and the coverage area is a first region;
  • optically reflective facet structure and the surface-covered multilayer structure coating form a second optical feature, the coverage area being the second region;
  • the sub-wavelength surface microstructure and the optical reflective facet overlap each other, and form a third optical feature with the multi-layer coating covered by the surface, and the coverage area is the third region;
  • optical characteristics 1, the optical characteristic 2 and the optical characteristic 3 of the first region, the second region and the third region may be detected by naked eye observation or instrument and have distinguishing features from each other;
  • the distinguishing features include:
  • the optical characteristics of the first region are different from the optical features of the second region
  • optical characteristics of the third region are different from the optical features of the second region
  • the optical scattering features provided by the substantially random variations distributed in the two-dimensional plane in which they are located, and/or according to the selected optical facets, depending on the orientation of the optical facets
  • the orientation is such that the second region can be perceived by the viewer as a surface that protrudes forward and/or backward relative to its actual spatial shape.
  • the multi-layer structure coating forms a Fabry-Perot cavity, which selectively absorbs and reflects the incident white light, so that the emitted light only contains certain wavelength bands, thereby forming a specific color; when the light is incident or outgoing When the angle changes, the relative optical path changes, and the interference band also changes, so that the color presented to the observer also changes, thereby forming a light-changing effect of a specific color.
  • the optical security element according to the present invention can have a sub-wavelength surface microstructure and a multilayer structure under natural light illumination conditions.
  • the optical feature of the first region of the coating is distinguished from the optical feature of the second region with the optically reflective facet and the multilayered coating, which can be detected by naked eye or instrumentation.
  • the first area of the optical security element is different from the second area
  • the optical scattering features provided by the substantially random variations distributed in the two-dimensional plane in which they are located according to the orientation of the optical facets and/or according to the orientation of the selected optical facets
  • the second region can be perceived by the viewer as a surface that protrudes forward and/or backward relative to its actual spatial shape.
  • the matching parameters of the sub-wavelength surface microstructure and the multi-layer coating include the period of the sub-wavelength microstructure, the groove depth, the aspect ratio (ie, the ratio of the groove depth to the period), and the aspect ratio (ie, the ratio of the peak width of the grating to the period). ), the trough shape, and the thickness of each layer of the multi-layer structure plating, the refractive index of the material, and the like are determined together; the parameters of the optical reflective facet include depth, width, inclination angle, and azimuth angle.
  • the present invention also provides an optical security product using the above optical security element.
  • the sub-wavelength surface microstructure and the first region and the optical reflective facet structure of the multi-layer structure plating layer are The second region in which the multilayer structure coating is located forms an optical characteristic having contrast, so that the optical security element or the optical security product with the security element is easily recognized and has strong anti-counterfeiting ability.
  • FIG. 1 is a cross-sectional view of an optical security element in accordance with one embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of an optical security element in accordance with yet another embodiment of the present invention.
  • FIG. 4 is a top plan view of an optical security element in accordance with yet another embodiment of the present invention.
  • an optical security element 1 comprises: a substrate 101; a sub-wavelength surface microstructure 1021 and an optically reflective facet 1022 formed on the upper surface 102 of the substrate 101 and at least partially covering the upper surface 102, wherein The region where the sub-wavelength surface microstructure 1021 is located is the region A, the region where the optically reflective facet 1022 is located is the region B, and the multi-layer structure plating layer 103 at least partially covers the region A and the region B.
  • the sub-wavelength surface microstructure may be a one-dimensional grating, and the sub-wavelength surface microstructure may have a sinusoidal shape, a rectangular shape, a zigzag shape, or the like; in addition, the sub-wavelength surface microstructure may be two
  • the dimensional grating may have a sinusoidal shape, a rectangular shape, a zigzag shape, or the like, and the grating distribution of the two-dimensional grating may be an orthogonal structure, a honeycomb structure, a two-dimensional Brava lattice structure, a random structure, or the like.
  • the structure of the sub-wavelength surface microstructure is not limited to the structure described above, and a combination of these sub-wavelength surface microstructures may be employed in actual optical security elements.
  • patterns such as characters and logos required for anti-counterfeiting can be realized.
  • the subwavelength surface microstructure has a groove depth of from 10 nm to 500 nm, preferably from 50 nm to 300 nm.
  • the sub-wavelength surface microstructure has a feature size in the two-dimensional plane in which it is located in the range of 50 nm to 500 nm, preferably 200 nm to 400 nm, but when the feature size in one direction satisfies the requirement, the feature size in the other direction may be Unlimited.
  • the matching relationship can be expressed by the aspect ratio (ie, the ratio of the groove depth to the period), which is based on a specific reproduction.
  • the effect is calculated by a rigorous coupled wave theory design.
  • the aspect ratio is usually in the range of 0.3-2, preferably 0.4-1.
  • the aspect ratio of the sub-wavelength surface microstructure (ie, the ratio of the peak width of the grating to the period) is also an important parameter affecting the optical effect, which mainly affects the brightness and contrast of the optical security element, and generally requires a ratio of 0.3- 0.7, preferably 0.4-0.6.
  • the structure of the multilayer structure plating layer 103 employed in the optical security element 1 according to the present invention will be described below.
  • the multilayer structure plating layer 103 may have a multilayer dielectric film structure, that is, composed of different dielectric layers having high and low refractive indices. This structure is usually designed using a ⁇ /4 film system.
  • the material used for each dielectric layer may be one or more of inorganic coating materials such as MgF 2 , SiO 2 , Al 2 O 3 , MgO, HfO 2 , TiO 2 , ZnS, ZnO, etc., of course, high A molecular polymer, or a combination of an inorganic coating material and a high molecular polymer.
  • the structure of the multi-layer structure plating layer 103 may also be a metal/dielectric multilayer film structure, and generally adopts a three-layer structure or a five-layer structure.
  • the structure of the multilayer structure plating layer 103 may include at least one of the following:
  • first reflective layer formed on the sub-wavelength surface microstructure, a first dielectric layer formed on the first reflective layer, and a first absorption layer formed on the first dielectric layer, the above three layers are sequentially Can be reversed;
  • a fourth absorption layer formed on the sub-wavelength surface microstructure, a third dielectric layer formed on the fourth absorption layer, and a second reflective layer formed on the third dielectric layer, formed on a fourth dielectric layer on the second reflective layer and a fifth absorption layer formed on the fourth dielectric layer;
  • a sixth absorption layer formed on the sub-wavelength surface microstructure a fourth dielectric layer formed on the sixth absorption layer, and a seventh absorption layer formed on the fourth dielectric layer, formed on a fifth dielectric layer on the seventh absorption layer and an eighth absorption layer formed on the fifth dielectric layer.
  • the multi-layer structure of the three-layer structure is a reflective layer, a dielectric layer and an absorbing layer, or an absorbing layer, a dielectric layer and an absorbing layer.
  • the former can only observe the light-changing effect on one side, and the latter can be observed on both sides. Light change effect.
  • the five-layer structure of the multi-layer structure coating is an absorbing layer, a dielectric layer, a reflective layer, a dielectric layer and an absorbing layer, or an absorbing layer, a dielectric layer, an absorbing layer, a dielectric layer and an absorbing layer, and a five-layer structure of the multi-layer structure plating layer may Observing the light-changing effect on both sides, the light-changing effects observed on both sides can be designed to be the same or different, which is determined by the parameters and materials of the respective reflective layer, dielectric layer, and absorption layer.
  • Each of the above reflective layers is generally a metal layer having a relatively large thickness, and the thickness thereof is usually greater than 20 nm, and the material used may be one of gold, silver, copper, aluminum, iron, tin, zinc, nickel, chromium, or the like. More.
  • Each of the dielectric layers may be a single dielectric layer, and the dielectric material may be selected from inorganic coating materials such as MgF 2 , SiO 2 , Al 2 O 3 , MgO, PMMA, HfO 2 , TiO 2 , ZnS, ZnO, and the like.
  • the thickness of the high molecular polymer is determined by the optical effect to be achieved and the refractive index of the material, and may generally be from 10 nm to 1000 nm, preferably from 50 nm to 800 nm.
  • each of the above dielectric layers may also be a multi-layer dielectric layer, and the dielectric material used may be selected from the group consisting of MgF 2 , SiO 2 , Al 2 O 3 , MgO, PMMA, HfO 2 , TiO 2 , ZnS, ZnO, etc.
  • Inorganic coating materials, and multilayer dielectric films are usually designed with high and low refractive index ⁇ /4 film systems.
  • the material used in each of the above absorption layers may be one or more of metals such as gold, silver, copper, aluminum, iron, tin, zinc, nickel, chromium, or a metal compound, and the thickness is usually not more than 20 nm, preferably 5 -10 nm, the function of which is to partially reflect, partially transmit and partially absorb the illumination light.
  • the structure of the multilayer structure plating layer 103 according to the present invention is not limited to the structures described above, for example, a two-layer structure (ie, a reflective layer and a dielectric layer), a four-layer structure (ie, an absorption layer, a dielectric layer, Structures such as reflective layers and dielectric layers are also preferred.
  • the multi-layer structure plating layer 103 can form a Fabry-Perot cavity, which selectively absorbs and reflects the incident white light, so that the emitted light only contains certain wavelength bands, thereby forming a specific color; when the light is incident Or when the exit angle changes, the relative optical path changes, and the interference band also changes, so that the color presented to the observer also changes, thereby forming a light-changing effect of a specific color.
  • the parameter matching relationship, the specific principle and the optical characteristics are specifically defined by the Chinese patent CN102514443, and the contents of the specification are incorporated in the present invention.
  • the sub-wavelength surface microstructure 1021 is combined with the multi-layer structure plating 103 to form a color of the discoloration feature that occurs as the viewing angle changes, and which is distinguished from the color provided by the multi-layer coating of a flat or smooth surface.
  • optical feature 2 provided by the combination of the optically reflective facet 1022 and the multilayer structure plating layer 103 is described below in conjunction with FIG. 1, which is different from the optical feature provided by the sub-wavelength surface microstructure and the multilayer structure plating layer 103. the reason.
  • the feature size or period (the facet may be periodic or non-periodic) of the optically reflective facet 1022 in at least one dimension on its two-dimensional plane is between 1 ⁇ m and 300 ⁇ m, preferably at 3 ⁇ m. Between 100 ⁇ m, particularly preferably between 5 ⁇ m and 30 ⁇ m.
  • the depth of the optically reflective facets is less than 10 [mu]m, preferably between 1 [mu]m and 5 [mu]m. Thus, it does not have a diffractive effect on the visible wavelength range.
  • the orientation of the optically reflective facets can be determined by their angle of inclination and/or their azimuth.
  • the optical reflective surface 1022 is combined with the multilayer structure plating layer 103 to provide optical characteristics.
  • the specific parameter setting, principle and optical characteristics are defined by Chinese patents CN102712207, CN102905909, CN103282212 and CN103229078, and the contents of the manual are incorporated. this invention.
  • the features of the multilayer structure plating layer 103 on the flat surface include its color, and the characteristics of the color change caused by the change of the viewing angle.
  • the combination of the optical reflecting facet 1022 and the multilayer structure plating layer 103 is substantially
  • the color feature provided by the multilayer structure plating layer 103 is not changed, that is, the multilayer structure plating layer has the same selective absorption and reflection characteristics as the multilayer structure plating layer formed on the flat surface, and for a specific light source, only corresponding to each
  • the optically reflective facets change the direction of the exiting light, and thus substantially change the distribution of the viewing angle of the color change feature of the multilayer structure coating 103 over the two-dimensional surface on region B.
  • the sub-wavelength surface microstructure 1021 and the optically reflective facet 1022 can be made into a working plate by a holographic interferometry, a laser direct lithography technique, an electron beam etching technique, etc., and can be made into a working plate by an electroforming process, and then molded, UV.
  • the production process such as copying is transferred to the surface of the substrate 101. It should be pointed out that due to the large difference in the order of magnitude between the sub-wavelength surface microstructure and the optical reflection facet size, both of them have higher difficulty in the original preparation and batch copying process, in pursuit of high quality.
  • the optical master can use a plurality of devices to complete the plate making method or the engraving method, or use the imposition method to combine the two structures.
  • the multi-layer structure plating layer 103 can be generally realized by a vacuum coating process such as thermal evaporation, electron beam evaporation, high-frequency sputtering, magnetron sputtering, ion sputtering, reactive sputtering, ion plating, or electroless plating or electroplating. Processes such as coating, etc., achieve some of these layers.
  • optical scattering provided by the optically reflective facet 1022 having a substantially random variation distributed in the two-dimensional plane in which it is located.
  • Features, and features according to the orientation of the selected optically reflective facet 1022 enable the second region to be perceived by the viewer as a surface that protrudes forward and/or rearward relative to its actual spatial shape.
  • the structure of the optically reflective facets 1022 of different parameters shown in region B of Figure 2(a) has a random or pseudo-random arrangement in the two-dimensional plane in which it resides, including the depth and width of the optically reflective facets.
  • the B region in Fig. 2(B) shows the use of the optically reflective facet 1022 to simulate the curved surface 1022' to form features that protrude from the surface 102, in which case any optically reflective facet on the two dimensional plane has a 1022 simulated with that position. 'The surfaces have roughly the same normal direction.
  • FIG. 3 is an embodiment of further adding a region C and its anti-counterfeiting feature 3 based on the optical security element 1 according to the present invention in FIG. 1, wherein the sub-wavelength surface microstructure 1021 and the optically reflective facet 1022 are overlapped with each other to form a substrate.
  • the anti-counterfeiting feature 3 includes the feature 1 and the feature 2, that is, the color and color change characteristics formed by the sub-wavelength surface microstructure 1021 and the multi-layer structure plating layer 10 different from the multi-layer structure plating layer, and the optical reflective facet 1022
  • the optical scattering features brought about by the random distribution on the two-dimensional surface of the region C and/or the features that can be perceived by the observer as surfaces that protrude forward and/or backward relative to the surface of the region C.
  • the sub-wavelength surface microstructure 1021 is selected to be a sinusoidal groove type, a period of 300 nm, a depth of 100 nm, and an orthogonal two-dimensional grid distribution, and the multilayer structure plating layer 103 is sequentially selected to include Al (40 nm)/SiO2. (370 nm) / Cr (5 nm) (On a flat surface, the multilayer structure coating of this parameter has a feature of a golden color on the front side and a green color on the oblique side).
  • the area A has a red color on the front side and a yellow color on the left side;
  • the area B has a golden-green color feature provided by the multi-layer plating layer and a scattering characteristic provided by the optically reflective facet and/or protrudes from The characteristics of the surface;
  • the region C has a red-yellow color characteristic and an optical reflection facet formed by the sub-wavelength surface microstructure and the multi-layer structure plating layer Scattering features and/or features that protrude from the surface are provided. All in all, the three regions A, B, and C have their own visual characteristics, forming a strong visual contrast with each other, thereby ensuring that the optical security component 1 has strong anti-counterfeiting capability.
  • the coverage of the multilayer structure coating in the optical security element of the present invention is patterned to form a hollowed out feature.
  • the patterning may be performed by patterning the entire multilayer structure plating layer, or alternatively, one or several layers may be separately patterned.
  • a patterned protective layer is applied by printing after forming a multi-layered plating, and then the plating outside the protected area is etched by a chemical solvent such as an alkali solution.
  • the release layer is printed before the formation of the multilayer structure plating layer, and after the formation of the multilayer structure plating layer, the plating layer above the release layer is peeled off by a certain liquid immersion (for example, water) to form a hollow pattern.
  • the hollow pattern 1031 of the multilayer structure plating layer 103 (the area not covered by the multilayer structure plating layer) and the sub-wavelength surface microstructure 1021 and There is a strict positional correspondence between the optically reflective facets 1022, so that the optical security element of the present invention has stronger identifiability and anti-counterfeiting capability.
  • A, B, and C respectively correspond to the three regions A, B, and C in Fig. 3, that is, "CBPM" and "ZSST" are formed by subwavelength surface microstructures having a multi-layer structure coating formed on the surface.
  • the color characteristics of B and area C and the characteristics of discoloration with observation angle is the optical scattering characteristic of the optically reflective facet formed with the multi-layer structure coating on the surface and the discoloration characteristic with the observation angle, and the area C is the surface formation.
  • the optically reflective facets of the layered coating produce features that visually protrude forward relative to their actual spatial shape and at the same time have a characteristic that discolors with viewing angle.
  • a method of forming the hollow region 1031 is exemplarily given below: a sinusoidal grating is formed in the region of 1031, and has an arrangement period of 350 nm and a depth of 300 nm (the surface microstructure of the region having an aspect ratio larger than 1031 is set). Then, a 5 nm thick Al layer and a 250 nm thick SiO 2 layer are sequentially deposited on the 102 side, and then the optical security element 1 is immersed in a 10% concentration NaOH solution until the Al layer in the 1031 region completely disappears. The area other than 1031 is still covered with an Al layer and an SiO 2 layer.
  • a cylindrical mirror is formed in the region 1031, the width is 30 ⁇ m, the gap between the cylindrical mirrors is 2 ⁇ m wide, and the height of the cylindrical mirror is 10 ⁇ m (this value is set) a height of 1.5 ⁇ m larger than the optically reflective facet, and an Al layer of 40 nm thick (thickness of the flat region), a 250 nm thick SiO 2 layer, and a 5 nm thick Cr layer are sequentially deposited on the 102 side, and formed by a coating process.
  • the protective layer (polyester material) had a thickness (relative to the flat surface) of 1 ⁇ m.
  • the optical security element 40 °C NaOH solution was placed in 10% strength soaking until the Al / SiO 1031 region 2 / Cr plating just disappears completely, outside the area still covered with the 1031 Al / SiO 2 / Cr plating. That is, the preparation of the optical security element is completed. At this time, the observation direction is such that the optical security element is viewed from the 102-face side, and Al/SiO 2 /Cr which is sequentially stacked on a region other than 1031 provides a multilayer structure plating layer, and a hollow pattern is formed in the 1031 region.
  • diffractive light-changing features and micro-nanostructure features may also be formed in and on the substrate 101 and its upper and lower surfaces and/or sub-wavelength surface microstructures and optically reflective facets. , printed features, fluorescent features, and one or more of the magnetic, optical, electrical, and radioactive features for machine readable.
  • the optical security element according to the present invention can be used as a label, a logo, a wide strip, a transparent window, a film, etc., and can be adhered to various articles by various bonding mechanisms. For example, transfer to high security products such as banknotes and credit cards and high value-added products.
  • Another aspect of the invention provides a product with the optical security element, including but not limited to banknotes, credit cards,

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Abstract

L'invention concerne un élément anti-contrefaçon optique et un produit anti-contrefaçon optique. L'élément anti-contrefaçon optique et le produit anti-contrefaçon optique comprennent : un matériau de base (101); une microstructure de surface de longueur d'onde secondaire (1021) et une structure de facette de réflexion optique (1022) qui sont formées sur une surface supérieure (102) du matériau de base (101) et qui recouvrent au moins partiellement une surface supérieure (102) du matériau de base (101); une structure de revêtement multicouche (103) qui est formée sur la microstructure de surface de longueur d'onde secondaire (1021) et la structure de facette de réflexion optique (1022) et qui recouvre au moins partiellement la microstructure de surface de longueur d'onde secondaire (1021) et la structure de facette de réflexion optique (1022); la microstructure de surface de longueur d'onde secondaire (1021) et la structure de facette de réflexion optique (1022) se chevauchent pour former une région de chevauchement. La microstructure de longueur d'onde secondaire, la structure de facette de réflexion optique et la structure de revêtement multicouche sont conçues afin de correspondre l'une à l'autre de telle sorte que, dans l'élément anti-contrefaçon optique selon la présente invention et dans des conditions d'éclairage de lumière naturelle, des caractéristiques optiques d'une région ayant une microstructure de longueur d'onde secondaire et une structure de revêtement multicouche peuvent être distinguées de celles d'une région ayant une structure de facette de réflexion optique et une structure de revêtement multicouche, et les caractéristiques optiques peuvent être observées à l'œil nu ou détectées par un instrument.
PCT/CN2016/080896 2016-04-21 2016-05-03 Élément anti-contrefaçon optique et produit anti-contrefaçon optique WO2017181442A1 (fr)

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EP3778256A1 (fr) * 2019-08-12 2021-02-17 Hueck Folien Gesellschaft m.b.H. Élément de sécurité

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