WO2012143746A1 - Étiquette de sécurité (versions), procédé permettant de former une étiquette de sécurité et procédé d'authentification de produit (versions) - Google Patents

Étiquette de sécurité (versions), procédé permettant de former une étiquette de sécurité et procédé d'authentification de produit (versions) Download PDF

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Publication number
WO2012143746A1
WO2012143746A1 PCT/IB2011/000922 IB2011000922W WO2012143746A1 WO 2012143746 A1 WO2012143746 A1 WO 2012143746A1 IB 2011000922 W IB2011000922 W IB 2011000922W WO 2012143746 A1 WO2012143746 A1 WO 2012143746A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
security label
mask
optically anisotropic
transparent
Prior art date
Application number
PCT/IB2011/000922
Other languages
English (en)
Inventor
Vadim A. SHEVKO
Ihar A. KRASHEUSKI
Original Assignee
ALTSHULER, Vladimir
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ALTSHULER, Vladimir filed Critical ALTSHULER, Vladimir
Priority to PCT/IB2011/000922 priority Critical patent/WO2012143746A1/fr
Priority to EP11723630.7A priority patent/EP2699425B1/fr
Publication of WO2012143746A1 publication Critical patent/WO2012143746A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/146—Security printing using a non human-readable pattern which becomes visible on reproduction, e.g. a void mark
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/005—Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/128—Viewing devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0292—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time tamper indicating labels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0294—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
    • B42D2033/04—
    • B42D2033/10—
    • B42D2033/18—
    • B42D2033/20—
    • B42D2033/30—
    • B42D2035/24—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/391—Special inks absorbing or reflecting polarised light

Definitions

  • This invention relates to validation of security papers, documents, banknotes, artworks and brand products.
  • Optical security elements that are able to change the polarization of incident light, may be used as such security features, such as holograms, liquid crystal optical elements, and polymer layers with hidden images visible in polarized light only.
  • a method of product authentication by forming a security label placed on the outer surface of protected product where a security label is comprised of a subsequently disposed transparent flexible substrate, a transparent thermoplastic lacquer layer, a metallized reflective layer and a transparent heat-sealable adhesive layer.
  • a relief-phase hologram with visible and hidden laser images is made in a transparent thermoplastic lacquer layer by hot embossing method. The visible image appears in white light, while hidden laser image becomes visible when the hologram is illuminated with coherent laser beam.
  • a polarized light-sensitive material is embedded into the security label; a polarizing encoding element is placed before the security label and then it is illuminated with blue-green light in order to record the hidden polarized image into the polarized light-sensitive layer; a polarizer is placed on the security label and illuminated with white light to reproduce the hidden polarized image; the polarized light-sensitive layer is situated on the outer surface of the transparent flexible substrate made of optically transparent material (see Patent # 2165360 of the Russian Federation, the invention description, Application # 95117875 of the Russian Federation, 1997.)
  • the closest prior art reference to the claimed security label is a security label comprising: a sequentially disposed metallic reflective layer, a transparent substrate, a transparent thermoplastic lacquer layer and having an element that changes optical properties of the substrate to form a hidden polarized image.
  • the element is made on a face side of the substrate in the form of a relief image that locally changes the optical depth of the substrate (see UK Patent # 2318180 published on 17 February 1999).
  • the closest prior art reference to the claimed method of forming a security label is a method of producing a security label in which the security label is made of a sequentially disposed metallic reflective layer, a transparent substrate, a transparent thermoplastic lacquer layer and there is produced an element that changes optical properties of the substrate to form a hidden polarized image.
  • the element is made on a face side of the substrate in the form of a relief image that locally changes the optical depth of the substrate (see UK Patent # 2318180 published on 17 February 1999).
  • the closest prior art reference to the claimed authenticity verification method of products is a method for ensuring authenticity of products in which a security label formed by the method described above is placed on the outside surface of the certified object and a hidden polarized image is visualized by observing it through a circular polarizer, (see UK Patent # 2318180 published on 17 February 1999).
  • the technical result of the invention is an implementation of a cost-effective and mass- producible security label with hidden polarized images without any visible outlines of such polarized images.
  • An additional technical result of the second and the third versions of the invention is an implementation of a cost-effective and mass-producible security label with hidden polarized color images without any visible outlines of such polarized images.
  • the technical result of the invention includes method of forming a cost-effective and mass-producible security label with hidden polarized images without any visible outlines of such polarized images and method of the product authenticity verification with the assistance of such security label.
  • the first claimed technical result in the first version of the claimed security label comprising: a sequentially disposed metallic reflective layer and an optically anisotropic transparent substrate, as well as an element able to change the optical properties of the said substrate in order to form a hidden polarized image, has been achieved at the expense of that the element changing the optical properties of the substrate is made in the form of mask that covers a face side of the substrate by the same metallic material that is used for the reflective layer on a reverse side of the substrate.
  • the claimed technical results in the second version of the claimed security label comprising: a sequentially disposed metallic reflective layer and at least two transparent superposed optically anisotropic substrates with elements able to change optical properties of the relevant substrate, has been achieved at the expense of that each element changing the optical properties of the substrate is made in the form of mask that covers a face side of the substrate by the same metallic material that is used for the reflective layer, while each mask is performed using a solid fill printing method with blank spaces made in accordance with the hidden image graphics. These blank spaces are made in such way that they may coincide or may not coincide for adjacent optically anisotropic transparent substrates, and for each section of such optically anisotropic transparent substrates with the blank spaces in their masks laying under the blank space of the top
  • n ei - the index of refraction for the extraordinary light beam in the i' h substrate; n w - the index of refraction for the ordinary light beam in the i' h substrate, has been selected to ensure that for the light passing through a polarizer to the security label the transmittance T of the correspondent section has a maximum on the preset wave length ⁇ , where ⁇ is the light wavelength in a vacuum.
  • the claimed technical results in the third version of the claimed security label comprising: a sequentially disposed metallic reflective layer and an optically anisotropic transparent substrate, has been achieved at the expense of that the element changing the optical properties of the substrate is made in the form of mask that covers a face side of the substrate by the same metallic material that is used for the reflective layer, and the mask is performed using a solid fill printing method with blank spaces made in accordance with the hidden image graphics.
  • the total optical thickness L d(n c - n 0 ), where
  • the transmittance T of the correspondent section has been selected to ensure that for the light passing through a polarizer to the security label the transmittance T of the correspondent section has a maximum on the preset wave length ⁇ , where ⁇ is the light wavelength in a vacuum.
  • the claimed technical result in the method of forming a security label wherein there are formed sequentially disposed metallic reflective layer and at least one optically anisotropic transparent substrate, and there is made an element changing the optical properties of the substrate to form a hidden polarized image, has been achieved at the expense of that the element changing the optical properties of the substrate is made in the form of mask that covers a face side of the substrate by the same metallic material that is used for the reflective layer on a reverse side of the substrate.
  • an additional technical result in the method of forming a security label has been achieved by ensuring that for each section of such optically anisotropic transparent substrates with the blank spaces in their masks laying under the blank space in the top
  • n Ej the index of refraction for the extraordinary light beam in the i' h substrate
  • the transmittance T of the correspondent section has been selected to ensure that for the light passing through a polarizer to the security label the transmittance T of the correspondent section has a maximum on the preset wave length ⁇ , where ⁇ is the light wavelength in a vacuum.
  • the claimed technical result in a method of the product authenticity verification, made by forming a security label located on the outer surface of the protected product and visualizing a hidden polarized image through a circular polarizer, has been achieved by using the claimed security label produced in accordance with the claimed method.
  • the mask should be performed using a solid fill printing with blank spaces made in accordance with the hidden image graphics.
  • the second technical result is achieved by forming at least one more sequentially disposed additional optically anisotropic substrate with an element changing the optical properties of the substrate and made in the form of the mentioned mask.
  • the metallic reflective layer on a reverse side of the film may be formed by solid fill printing with a metallic ink without any blanks.
  • the security label should be applied to the outer surface of the protected product using an extra adhesive layer.
  • the mask on a face side of the substrate may be covered by at least one masking layer made preferentially of the same metallic material as the reflective layer and the mask; the density and/or thickness of the said layer should be enough to hide the mask outline without impeding the light transmission through the masking layer.
  • the security label may be formed directly during the printing process as a part of protected products like packing, labels, scotch tape, sealing tape based on optically anisotropic transparent film.
  • the optically anisotropic transparent substrate may be an oriented polymer film selected from the group that includes polyethilentereftalate, biaxially-oriented and axially oriented polypropylene film, or oriented lacquer layer made from the polymer group that includes polyvinyl alcohol (PVA), polystyrene, polycarbonate and ethylcellulose.
  • PVA polyvinyl alcohol
  • Figs. 1 to 4 are schematic representation of the method of forming a structure of the security label, while Fig. 4 shows a final structure of the first version of the security label;
  • Fig. 5 shows a final structure of the second and the third versions of the security label and the scheme of forming a hidden polarized color image when the light passes through the label;
  • Fig. 6 is a schematic illustration of the light passing through the system "polarizer - optically anisotropic film - reflective layer,
  • Fig. 7 represents the orientation of the polarizer axis with reference to main directions of the optically anisotropic film
  • Fig. 8 shows the spectral dependence of transmittance T of the system for different thickness values of the optically anisotropic film ⁇ ⁇ (" e ⁇ n ° ⁇ ;
  • Figs. 9 to 10 are an optical scheme for observing a hidden polarized image.
  • the claimed security label is based upon the optically anisotropic substrate made of the film (1) (see Fig. 4) with a reverse side covered with the metallic reflective layer (2).
  • a reverse side of only one (lower) film 1 is covered with the metallic reflective layer (2).
  • a heat sealable adhesive layer (not shown on the drawings) may be applied on the metallic reflective layer (2). Such adhesive may be used to stick together the layers of the film (1) shown in Fig. 5.
  • the claimed method of producing a security label can be realized as follows (see Figs. 1 to 4).
  • An optically anisotropic transparent film (1) is used for printing.
  • the film thickness is of no importance.
  • One of the following printing methods is used to form a hidden polarized image: offset printing; letterpress printing; flexographic printing; intaglio printing, etc.; the same metallic ink is used during all printing stages.
  • the metallic reflective layer (2) is formed by printing (using any printing method) a reverse side of the transparent film (1) by metallic ink (silver, gold, pearl%) (see Fig. 1).
  • the ink layer thickness in this sample is 0,8 ⁇ . If the thickness of the reflective background layer is increased, the thickness of all other layers should be proportionally increased as well.
  • the mask (3) is formed by printing (using any printing method) a face side of the transparent film (1) by the same metallic ink (silver, gold, pearl%) as for the reflective background layer with a printing plate (not shown on the drawings) having a required image or text (see Fig. 2).
  • the ink thickness in this sample is at least 0, 1 ⁇ .
  • the masking reflective layer (4) (see Fig. 3) is made by printing (using any printing method) over the mask (3) formed during Stage 2 by the same metallic ink (silver, gold, pearl...) as for the reflective background layer (2).
  • the density and/or thickness of the masking reflective layer (4) should be enough to hide the mask outline without impeding the light transmission through the masking layer.
  • the thickness of the masking reflective layer (4) in this sample is at least 0, 1 ⁇ . Depending on the result the thickness and/or density of the layer (4) may be increased or reduced. If the hidden image is insufficiently masked and remains visible with the naked eye, then the thickness of the masking layer (4) should be increased.
  • the masking dispersive lacquer layer (5) (see Fig. 4) is formed by printing over the masking layer (4) made during Stage 3 with guilloche or other image (using any printing method). Lacquers containing at least 15% of pearl pigments (Iriodin®, Pearlets, Phoenix, etc) should be used. The lacquer thickness in this sample is at least 0,3 ⁇ . Depending on the result the thickness of the masking dispersive lacquer layer (5) may be increased or reduced. If the hidden image is insufficiently masked and remains visible with the naked eye, then the thickness of the masking dispersive lacquer layer (5) should be increased.
  • the finished security label is obtained (see Fig. 4) without any outlines or relief visible on the surface.
  • Stage 2 When a multilayer substrate is required, a relevant number of substrate layers is made during Stage 2 (without any reflective layer). The prepared additional substrates are laid on the substrate implemented during Stages 1 and 2 and sticked together by optically transparent adhesive. Operations specified for Stages 3 and 4 are performed as described above.
  • the security label can be made (printed) directly on the protected product.
  • the metallic reflective layer (2) may be covered by a heat-sealable adhesive (not shown on the drawings) to stick the security label onto a surface of the protected product.
  • the claimed method of producing a security label is intended to form the hidden images that become visible in polarized light. It can be used with any printing methods: offset printing; letterpress printing; flexographic printing; intaglio printing, etc.
  • the claimed first version of a security label (Fig. 4) is used for the product authenticity verification as follows (see Figs. 9 to 10).
  • the security label is placed on the outer surface of the protected product or is embedded into the same. If the claimed security label is illuminated with white light no images or relief are visible on its surface.
  • the light passing through a polarizer (6) to the security label becomes polarized.
  • the polarized light passes through the layers (5) and (4) and the sections of the mask (3) that are not covered with metallic ink, then goes into the transparent substrate (1) and is reflected from the reflective layer (2).
  • the mask (3) acts as an element changing the optical properties of the substrate (1) in the sense that the sections of the mask (3) that reflect the polarized light without altering the same transfer this property to the substrate (1) because under these sections of the mask there appears no light in the substrate. Light beams reflected by the layer (2) re-pass through the substrate (1).
  • the polarization of light Due to the optical anisotropy of the transparent substrate ( 1), the polarization of light is altered, however, the human eye does not detect any changes in the polarized light reflected by the mask and passed through the optically anisotropic substrate, and therefore the image remains invisible with the naked eye.
  • the hidden polarized image generated by changes in polarization of light becomes visible if observed through a circular polarizer (6), because the polarized light, reflected by the mask without any changes in polarization, is absorbed by a circular polarizer (6), while the light, that has passed through the optically anisotropic substrate and changed its polarization state, passes through a circular polarizer (6) without any changes.
  • a polarizer (6) can be put on the security label or, alternatively, the system comprising of polarized glasses and a source of polarized light can be used.
  • the claimed security label enables the visualization of a white image (7) on a dark-blue background that coincides with the image shown in the mask (3).
  • the same way can be used for authentication with assistance of the second and the third versions of the security label, however, in this case, the hidden image is colored.
  • Colored image is generated in such security labels due to chromatic polarization (coloration of initially white light) of the light that has passed through linear/circular polarizer (6) and optically anisotropic film (1) with reflective layer (2) (see Figs. 6 and 7), the optical axis of this film is perpendicular to the light traveling direction.
  • a polarizer lets light pass through if the electric field oscillations E 0 are directed along the polarizer axis. Passing through the optically anisotropic film a light wave splits into two waves with mutually orthogonal electric field oscillations E X and E V . Both waves
  • the transmittance of the considered system for a linear polarizer is:
  • T LJN E 2 1
  • E Q 1 - sin 2 2or sin 2 (A ⁇ /2)
  • T cir sin 2 2a sin ( ⁇ p 12) ,
  • ⁇ 4nd(n e - n a )/ ⁇ - phase difference between oscillations
  • Table 1 shows interferential colors for different values of optical thickness of the optically anisotropic film (or total optical thickness of a pack of optically anisotropic films) with the reflective layer.
  • the claimed versions of the security labels with hidden polarized images may be realized by proper selection of the optical thickness of the substrate or substrates (for multicolored hidden images), by forming a reflective layer, a mask or masks (for multicolored hidden images) with the same metallic material as for the reflective layer, and a masking dispersing layer used to hide the outlines of the polarized image on the label. Verification of the security label with hidden polarized images is made using a polarizer.

Abstract

La présente invention a trait à une validation de papiers de sécurité, de documents, de billets de banque, d'œuvres d'art et de produits de marque. Les résultats techniques de l'invention sont l'implémentation d'étiquettes de sécurité rentables et pouvant être produites en série avec des images polychromes ou monochromes polarisées et cachées, sans qu'aucun des contours desdites images polarisées ne soit visible, le procédé permettant de former lesdites étiquettes ainsi que le procédé de vérification de l'authenticité du produit à l'aide des étiquettes de sécurité revendiquées. L'étiquette de sécurité revendiquée comprend une couche réfléchissante métallique disposée de façon séquentielle et un substrat transparent optiquement anisotrope, ainsi qu'un élément qui est en mesure de changer les propriétés optiques dudit substrat afin de former une image polarisée cachée. L'élément changeant les propriétés optiques du substrat se présente sous la forme d'un masque qui recouvre une face avant du substrat au moyen du même matériau métallique que celui qui est utilisé pour la couche réfléchissante au verso du substrat. Dans la seconde version, l'étiquette de sécurité revendiquée comprend au moins deux substrats optiquement anisotropes superposés et transparents, chaque masque étant effectué à l'aide d'un procédé d'impression à remplissage solide, des espaces vides étant réalisés en fonction du graphique de l'image cachée. Ces espaces vides sont réalisés de manière à ce qu'ils puissent coïncider ou pas avec des substrats transparents optiquement anisotropes adjacents, et pour chaque section desdits substrats transparents optiquement anisotropes dont les masques sont dotés d'espaces vides reposant sous l'espace vide du masque de substrat supérieur, l'épaisseur optique totale, la Formule (I), où di est l'épaisseur d'un i e substrat optiquement anisotrope ; i est un nombre compris entre 1 et N en fonction du nombre de substrats transparents mentionnés ci-dessus ; nei est l'indice de réfraction du faisceau lumineux extraordinaire dans le i e substrat ; n oi est l'indice de réfraction du faisceau lumineux ordinaire dans le i e substrat, a été sélectionné de manière à garantir que pour la lumière passant par un polariseur jusqu'à l'étiquette de sécurité le facteur de transmission T de la section correspondante est doté d'une valeur maximale sur la longueur d'onde prédéfinie λ, où λ est la longueur d'onde de la lumière dans le vide.
PCT/IB2011/000922 2011-04-21 2011-04-21 Étiquette de sécurité (versions), procédé permettant de former une étiquette de sécurité et procédé d'authentification de produit (versions) WO2012143746A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB2011/000922 WO2012143746A1 (fr) 2011-04-21 2011-04-21 Étiquette de sécurité (versions), procédé permettant de former une étiquette de sécurité et procédé d'authentification de produit (versions)
EP11723630.7A EP2699425B1 (fr) 2011-04-21 2011-04-21 Étiquette de sécurité (versions), procédé permettant de former une étiquette de sécurité et procédé d'authentification de produit (versions)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2011/000922 WO2012143746A1 (fr) 2011-04-21 2011-04-21 Étiquette de sécurité (versions), procédé permettant de former une étiquette de sécurité et procédé d'authentification de produit (versions)

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WO2012143746A1 true WO2012143746A1 (fr) 2012-10-26

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WO2016066263A1 (fr) * 2014-10-29 2016-05-06 Giesecke & Devrient Gmbh Élément de sécurité pourvu d'un élément à couche mince à effet interférentiel
GB2542783A (en) * 2015-09-29 2017-04-05 De La Rue Int Ltd Security print media and method of manufacture thereof
GB2542786A (en) * 2015-09-29 2017-04-05 De La Rue Int Ltd Security print media and method of manufacture thereof
EA026971B1 (ru) * 2014-10-27 2017-06-30 Открытое Акционерное Общество "Научно-Производственное Объединение "Криптен" Защитный элемент со скрытым поляризованным цветным изображением
GB2550101A (en) * 2015-10-30 2017-11-15 Innovia Films Ltd Birefringent banknote film
CN112995429A (zh) * 2019-12-24 2021-06-18 安徽大学 一种基于brg嵌入顺序原则的彩色图像可逆信息隐藏方法、恢复方法
GB2596075A (en) * 2020-06-15 2021-12-22 Iq Structures Sro Composite security element
CN114633572A (zh) * 2022-03-02 2022-06-17 武汉华工图像技术开发有限公司 一种光变防伪刮刮墨、刮刮墨产品及其制备方法

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RU2725667C1 (ru) * 2019-11-21 2020-07-03 Акционерное Общество "Научно-Производственное Объединение "Криптен" Оптическое защитное устройство (варианты), способ изготовления указанного устройства и способ верификации защищаемого объекта, содержащего указанное оптическое защитное устройство

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