EP3210794A1 - Article polymère multicouches, comme un document d'identité - Google Patents

Article polymère multicouches, comme un document d'identité Download PDF

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Publication number
EP3210794A1
EP3210794A1 EP15863210.9A EP15863210A EP3210794A1 EP 3210794 A1 EP3210794 A1 EP 3210794A1 EP 15863210 A EP15863210 A EP 15863210A EP 3210794 A1 EP3210794 A1 EP 3210794A1
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EP
European Patent Office
Prior art keywords
pixel
pixels
images
article
layers
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP15863210.9A
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German (de)
English (en)
Other versions
EP3210794B1 (fr
EP3210794A4 (fr
Inventor
Alexey Mikhailovich Goncharov
Evgeniya Alexandrovna IVANCHENKO
Valentin Anatolievich KSENOFONTOV
Andrey Borisovich Kuryatnikov
Sergey Nesterovich LAZARYUK
Ehrnest Yaroslavovich NIKIRUY
Andrey Valentinovich Smirnov
Leonid Igorevich Smirnov
Konstantin Vladimirovich KHARLAMOV
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aktsionernoe Obshchestvo "goznak"
Original Assignee
Aktsionernoe Obshchestvo "goznak"
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Publication of EP3210794A1 publication Critical patent/EP3210794A1/fr
Publication of EP3210794A4 publication Critical patent/EP3210794A4/fr
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Publication of EP3210794B1 publication Critical patent/EP3210794B1/fr
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Classifications

    • 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
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/21—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
    • 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
    • B42D25/23—Identity cards
    • 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
    • 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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/455—Associating two or more layers using heat

Definitions

  • the invention relates to polymer chemistry, technology of thin-film polymeric materials, and composite multi-layered polymeric products.
  • Polymeric films have currently found wide application in the manufacture of various multi-layered products e.g. documents that must be secure from counterfeit and are intended to identify their owner.
  • Composite materials for production of secure documents are being improved constantly, and they should ensure high physical and mechanical characteristics of the product in terms of its durability and resistance to the effects aimed at delamination and changes to graphics and other data. For mass production of identification documents, it is necessary that the used materials were produced without changing the existing technologies.
  • polymeric multi-layered materials in identity documents such as passports, identity cards, driver's licenses, is important to ensure counterfeit protection.
  • personal information about the document's owner is inscribed in them. Typically, this is a portrait and biometric data of the owner, date and place of birth, time and place of issue of the document, etc.
  • personal information is inscribed in the form of portrait and text images that are placed on/or in individual layers of the multi-layered plastic structures.
  • additional or duplicate images and information related to the basic information are inscribed, which are semi-transparent, visualized in transmitted and/or reflected light, and do not interfere with the perception of the basic information.
  • hidden or encrypted information is added to the additional or duplicate images, which allows authentication of the document with the use of dedicated instruments.
  • Additional colored graphic or text images are effective for counterfeit protection of not only documents, but also individual multi-layered polymeric elements, for example, non-removable protective stickers applied to the articles to confirm their authenticity.
  • These articles may include any product, in particular printing products.
  • elements are individualized, that is images applied to them are individual for each element or a limited group of such elements, and these images can be related to individual characteristics of the protected products e.g. their serial numbers.
  • the methods include e.g. a method of recording in multi-layered structures containing inks that change color when exposed to laser radiation (RU 2286888 C2, 10.11.2006 ), or a method of laser engraving of sub-layers of a multi-layer structure including a sequence of layers of pigments of various colors ( US 7763179 B2 27.07.2009 ).
  • the disadvantage of the methods is the need for unique multi-layered materials with special composition and pigment coatings, which complicates implementation of the methods and their use in industry.
  • a method in which an additional image is formed in a multi-layered polymeric document in a semi-transparent layer by laser engraving of partially demetalized diffraction grating, which is a component of the main fixed holographic image ( US 2013/0082458 A1 04.04.2013 ). This is done at laser marking of the underlying layer, which is carbonized under laser radiation. Partial demetallization of the diffraction grating protects the document against delamination since it provides fusion of the material of adjacent layers in the areas free of metallization.
  • the main disadvantage of this method is that it is impossible to form an arbitrary colored image.
  • One of the most promising methods for personalization and individualization of documents is a method of forming full-color holographic images in a multi-layered polymeric structure ( RU 2079167 C1, 10.05.1997 ). Images are inscribed on internal diffraction gratings, one above the other in multi-layered polymeric carriers. The full-color images are restored in white light. Information placed on the carrier is in the form of text and graphic images.
  • the object of the invention is to provide a multi-layered polymeric article such as a secure identification document, which comprises, in addition to basic personal data, additional colored images related to the personal data and individualizing the document, the document being protected from delamination and counterfeit of the inscribed personal information.
  • the additional colored images are formed as a semi-transparent matrix of pixels comprising metallized diffraction gratings and spaced apart so that the polymeric layers of the article can be fused together in the areas free of diffraction gratings in the manufacture of the article.
  • the layer with a semi-transparent pixel matrix is disposed above the layer with personalized graphics and text data.
  • the pixels are diffraction gratings reflecting electromagnetic radiation of a predetermined wavelength in a predetermined direction.
  • the article manufactured according to any embodiment can be a banknote, protective sticker, blank sheet for a valuable document, excise stamp, passport, identity card, travel document, driver's license, diploma, plastic card or similar document.
  • the pixels are formed by masking and then etching the matrix structures on the surface of transparent polymer films prior to fusing together the layers of the identification document.
  • Images are inscribed in the present identification document by a focused laser radiation on laser engraving machines. Images are formed by partially destroying the metallized diffraction gratings, which changes the color saturation and brightness of the sub-pixel areas owing to modulation of intensity, duration and number of laser pulses, with precise positioning of the laser beam on elements of the pixel matrix and/or special markers disposed on the surface of the pixel matrix.
  • the ability to remove the diffraction grating is determined by the presence of its metallization, since engraving is generally performed by infrared lasers with the electromagnetic radiation wavelength of 1.064 ⁇ m, which is well absorbed in metals and leads to demetallization of the diffraction gratings and loss of their reflective properties.
  • Laser beam is moved over pixels of the matrix structure and focused on subpixels with diffraction gratings that reflect light of a specific wavelength. Depending on the duration and power of laser pulses, the diffraction grating in the selected pixel is removed completely or partially.
  • Pixel elements of the matrix structure may have various forms, for example, rectangular, diamond-shaped or round.
  • the pixels can have a size of 30 to 200 ⁇ m.
  • at least two polymeric layers are joined together by fusion, and pixel matrixes are formed on the surfaces between the fused layers, one of which is transparent, and consist of pixels spaced apart by a distance of 30 to 500 ⁇ m.
  • Predetermined transparency of the formed images is from 50 to 99%. Size, location and distance between the pixels determine the transparency of inscribed images and the complexity of delamination of the multi-layered polymeric card without destroying the diffraction gratings in subpixels of the matrix structure, therefore, without destroying the inscribed images.
  • Minimum size of the pixels is determined by the diameter of the laser beam used in practice, which is in the range of from 5 ⁇ m to 100 ⁇ m, and the ability of pointing the beam to pixels with precision that allows engraving the diffraction gratings.
  • Maximum size of the pixels is limited by the fact that non-transparent pixels overlap underlying images and make them inaccessible for observation. For a typical thickness of the transparent layer between the additional and main image of 50 to 100 ⁇ m the maximum pixel size should not exceed 200 ⁇ m.
  • two adjacent polymeric layers must be uniformly fused together over the area not less than 50% of the total area of the layer because the metallized diffraction structure relates to easily peelable components.
  • Sub-pixel diffraction gratings can be disposed inside the pixels both adjacent to each other and at some distance from each other; this is determined by the resolution of the laser engraving machine employed.
  • the density of diffraction pixels performs the function of control of the transparency of the diffraction structure. Any attempt to separate the layer with the applied additional image from the layer with personal data will result in distortion of spatial relationship between the elements, which will be easily discernible at instrumental authentication of the document in a case of poor legibility of the image with the naked eye.
  • Fig. 1 shows a schematic diagram of an identification document according to the invention, where 1 is an upper transparent polymeric layer comprising thin-film aluminum reflecting elements; 2 - pixels in nodes of a matrix with sub-pixel structures; 3, 4 - sub-pixels filled with diffraction gratings, which reflect white light 5 falling on them in a predetermined direction 6, radiation of red and blue color, respectively.
  • 8 is a pixel consisting of a single sub-pixel comprising a diffraction grating that reflects light of a predetermined wavelength in a predetermined direction. It can be used for personalization of a document by inscribing a monochromatic image of a predetermined color.
  • An exemplary embodiment of the present invention is a multi-layered identification document, in which an upper transparent polymeric layer 1, disposed above underlying layers with main graphic images and personal data, comprises thin-film aluminum reflective elements. Images are formed in a matrix with nodes, in which pixels 2 are disposed; the pixels 2 have sub-pixel structures consisting of two areas with different diffraction gratings reflecting electromagnetic light radiation of red and blue color, respectively, in a predetermined direction.
  • the pixels may have rectangular or any other shape with typical sizes of 30 to 200 ⁇ m.
  • the pixel elements of the matrix are spaced apart at distances of 30 to 500 ⁇ m, which determine the transparency level of the image - the transparency of the formed images can be adjusted by the density of pixels.
  • Transparency of the images formed according to the invention is from 50 to 99%.
  • Each pixel is divided into two areas: subpixels 3, 4, filled with diffraction gratings, which reflect radiation of red and blue color, respectively, when white light 5 falls on them, in a predetermined direction 6, for example, perpendicular to the surface of the information carrier.
  • the number of subpixels is not limited to two, there may be 3, 4, etc.
  • Areas occupied by the diffraction gratings are identical in each of the subpixels.
  • a personalization image for example, colored text, is inscribed, part of the diffraction grating is burned out in each of the subpixels 7.
  • a colored image is formed, which can be restored under exposure to white light 5 and observed in a predetermined direction 6 to the surface of the pixel array.
  • the size and diffraction efficiency of the sub-pixel areas can be varied by changing the intensity, duration and number of laser pulses.
  • high-precision methods are used to point the beam to pixel elements of the matrix and special marking labels. Given the quite large number of pixels (thousands or more) coding by positions of each pixel is very secure.
  • the predetermined transparency of the formed images is dictated by the following: the upper limit of the range is selected owing to the fact that if the layer contains a distributed array of metallized diffraction pixels occupying 1% of the area of the layer, light reflected by the matrix will be still sufficient for perception of the image.
  • the lower limit of the range is selected owing to the fact that 50% of transparency is directly related to the requirement of protection from delamination, since the document will be able to be delaminated if the area of non-transparent pixels is more than 50% of the total area of the layer.
  • a further exemplary embodiment comprises two sub-pixel structures (reflecting blue and red color), rather than three, as in the RGB color image system (red, green, blue), to illustrate a simplified procedure of image formation with a laser, because in this case the laser beam pointing system is simpler.
  • the embodiment with two basic colors can form a colored image having a limited range of colors, but easily distinguishable and identifiable. Use of two basic colors reduces requirements to the complexity of scanning and laser beam guidance control algorithms, but retains the counterfeit security of the document owing to the unique method of laser control.
  • the security feature comprises a reflective layer containing aluminum reflective elements.
  • the observer perceives the area as non-transparent or totally reflective when 85% of incident light is reflected and as transparent when less than 20% of the incident light is reflected and more than 60% is transmitted. It has been determined that the transparency and/or reflectivity level of the metal layer depends on the wavelength. Therefore, color effects can be observed under exposure to polychromatic, for example, day light.
  • Pixel areas can be of various shapes, for example, hexagon, rectangle, rhombus, square, irregularly shaped spot, etc.
  • shape of sub-pixel areas may be chosen, for example, as rectangles with coincident boundaries; in this case pixels have the shape of squares.
  • hidden information can be inscribed on the pixel matrix by changing the shape and/or size of pixels.
  • a pixel consists of two rectangular subpixels of different color.
  • the upper or lower half of one sub-pixel can be removed.
  • Hidden encoded information can be formed by changing the place of removal of the sub-pixel grating, that is, by changing the overall shape of the pixel, which consists of shapes of subpixels, and maintaining the total area of removal,. This information can be decoded with the aid of a dedicated instrument.
  • inventive identification document may contain personal information in electronic form, inscribed on an electronic carrier integrated in the document.
  • a special case of the invention is a document, which is personalized by inscribing a monochromatic image of a predetermined color.
  • each pixel consists of only one sub-pixel 8 containing a diffraction grating that reflects light of a predetermined wavelength in a predetermined direction.
  • protection of a multi-layered polymer product from delamination is definitely determined by the location and size of the pixels, that is, the complexity of delamination is determined by the pixel structure.
  • delamination of a product occurs at the areas where the adhesion between the layers is the least. If two layers with identical molecular structure are fused together, maximum bond between the layers is provided owing to formation of a monolithic layer.
  • absolute fusion is difficult to implement technologically.
  • Diffraction grating is formed on the surface of one polymeric layer. To enhance its reflectivity, a thin metal layer is applied to the grating surface.
  • the invention relates to polymer chemistry, technology of thin-film polymeric materials and can be used in the production of various multi-layered products, such as documents that require protection from counterfeit and are intended to identify their owner.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Credit Cards Or The Like (AREA)
EP15863210.9A 2014-11-24 2015-10-07 Article polymère multicouches, comme un document d'identité Not-in-force EP3210794B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2014147088/05A RU2566421C1 (ru) 2014-11-24 2014-11-24 Многослойное полимерное изделие, такое как идентификационный документ
PCT/RU2015/000649 WO2016085365A1 (fr) 2014-11-24 2015-10-07 Article polymère multicouches, comme un document d'identité

Publications (3)

Publication Number Publication Date
EP3210794A1 true EP3210794A1 (fr) 2017-08-30
EP3210794A4 EP3210794A4 (fr) 2017-11-29
EP3210794B1 EP3210794B1 (fr) 2018-12-12

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EP15863210.9A Not-in-force EP3210794B1 (fr) 2014-11-24 2015-10-07 Article polymère multicouches, comme un document d'identité

Country Status (3)

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EP (1) EP3210794B1 (fr)
RU (1) RU2566421C1 (fr)
WO (1) WO2016085365A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020174153A1 (fr) * 2019-02-28 2020-09-03 Idemia France Image couleur formee a partir d'un hologramme
WO2023133632A1 (fr) * 2022-01-14 2023-07-20 Canadian Bank Note Company, Limited Élément de sécurité avec métallisation pour documents de sécurité
RU2817804C2 (ru) * 2019-02-28 2024-04-22 ИДЕМИА Франс Цветное изображение, сформированное из голограммы
FR3142016A1 (fr) 2022-11-09 2024-05-17 Franck Guigan Image variable à domaine de visibilité élargi

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2725793C1 (ru) * 2019-11-29 2020-07-06 Акционерное общество "Гознак" (АО "Гознак") Способ изготовления многослойного полимерного защищенного изделия с идентифицирующим оптически-переменным изображением с прибороопределяемыми признаками и многослойное изделие с идентифицирующим оптически-переменным изображением

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2079167C1 (ru) * 1994-09-06 1997-05-10 Эрнест Ярославович Никируй Носитель информации
AU2005238699B2 (en) * 2004-04-30 2008-11-20 De La Rue International Limited Arrays of microlenses and arrays of microimages on transparent security substrates
FR2916678B1 (fr) * 2007-06-01 2021-07-16 Advanced Track & Trace Procede et dispositif de securisation de documents
US10078306B2 (en) * 2007-05-11 2018-09-18 M R Stephenson Group Limited Security holograms formed using lenticular multichannel image generation device
DE102008012423A1 (de) * 2007-10-31 2009-05-07 Bundesdruckerei Gmbh Verfahren zur Herstellung eines Polymerschichtverbundes und Polymerschichtverbund mit farbigem Sicherheitsmerkmal
EP2109014A1 (fr) * 2008-04-08 2009-10-14 JDS Uniphase Corporation Dispositif contenant un OVD amélioré
FR2971972B1 (fr) * 2011-02-28 2013-03-08 Jean Pierre Lazzari Procede de formation d'une image laser couleur a haut rendement reflectif et document sur lequel une image laser couleur est ainsi realisee

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020174153A1 (fr) * 2019-02-28 2020-09-03 Idemia France Image couleur formee a partir d'un hologramme
FR3093302A1 (fr) * 2019-02-28 2020-09-04 Idemia France Image couleur formée à partir d’un hologramme
CN113508040A (zh) * 2019-02-28 2021-10-15 艾德米亚法国公司 从全息图形成的彩色图像
KR20210132088A (ko) * 2019-02-28 2021-11-03 아이데미아 프랑스 홀로그램에서 형성된 컬러 이미지
JP2022522135A (ja) * 2019-02-28 2022-04-14 アイデミア フランス ホログラムから形成されたカラー画像
CN113508040B (zh) * 2019-02-28 2023-12-29 艾德米亚法国公司 从全息图形成的彩色图像
RU2817804C2 (ru) * 2019-02-28 2024-04-22 ИДЕМИА Франс Цветное изображение, сформированное из голограммы
AU2020228143B2 (en) * 2019-02-28 2025-03-13 Idemia Identity & Security France Colour image formed from a hologram
WO2023133632A1 (fr) * 2022-01-14 2023-07-20 Canadian Bank Note Company, Limited Élément de sécurité avec métallisation pour documents de sécurité
FR3142016A1 (fr) 2022-11-09 2024-05-17 Franck Guigan Image variable à domaine de visibilité élargi

Also Published As

Publication number Publication date
RU2566421C1 (ru) 2015-10-27
EP3210794B1 (fr) 2018-12-12
EP3210794A4 (fr) 2017-11-29
WO2016085365A1 (fr) 2016-06-02

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