EP4344897A1 - Sicherheitsdokument und entsprechendes herstellungsverfahren mit einer perforierten lichtundurchlässigen schicht über einer matrix aus farbigen subpixeln - Google Patents

Sicherheitsdokument und entsprechendes herstellungsverfahren mit einer perforierten lichtundurchlässigen schicht über einer matrix aus farbigen subpixeln Download PDF

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Publication number
EP4344897A1
EP4344897A1 EP23186957.9A EP23186957A EP4344897A1 EP 4344897 A1 EP4344897 A1 EP 4344897A1 EP 23186957 A EP23186957 A EP 23186957A EP 4344897 A1 EP4344897 A1 EP 4344897A1
Authority
EP
European Patent Office
Prior art keywords
pixels
layer
white
colored
opaque layer
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.)
Pending
Application number
EP23186957.9A
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English (en)
French (fr)
Inventor
Benoît BERTHE
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.)
Idemia France SAS
Original Assignee
Idemia France SAS
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 Idemia France SAS filed Critical Idemia France SAS
Publication of EP4344897A1 publication Critical patent/EP4344897A1/de
Pending legal-status Critical Current

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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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/346—Perforations
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/34—Multicolour thermography
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • 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
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser

Definitions

  • the invention relates to the field of security documents, and in particular security documents on or within which images can be observed.
  • the invention applies non-exclusively to physical identity documents, such as a passport, an identity card, a driving license, a residence permit, etc.
  • identity documents also known as identity documents or security documents.
  • This market concerns very diverse documents, such as identity cards, passports, access badges, driving licenses, etc., which can be presented in different formats (cards, booklets, etc.).
  • Security documents must be authenticated easily and quickly. They must also be difficult to counterfeit (if possible unfalsifiable), in the face of the latest counterfeiting techniques.
  • Security documents typically feature colorful images, for example photographs of the faces of a security document bearer.
  • Colored imaging techniques for secure identity documents use arrays of colored subpixels (e.g. with Red-Green-Blue subpixels or Cyan-Magenta-Yellow subpixels) and techniques for blackening a layer which will mask portions of sub-pixels to obtain pixels of a desired color.
  • colored subpixels e.g. with Red-Green-Blue subpixels or Cyan-Magenta-Yellow subpixels
  • a laserizable layer may be a transparent polycarbonate layer and may include additives sensitive to the passage of a laser beam because this beam chars them.
  • Such a laserizable layer will be blackened or at least partially grayed throughout its thickness depending on the power of the laser since the additives sensitive to the passage of a laser beam are distributed uniformly throughout the thickness of the layer.
  • the present invention proposes a security document comprising a stack of layers comprising a matrix of colored sub-pixels, an opaque layer of white appearance above the matrix of colored sub-pixels, in which the opaque layer white in appearance has perforations facing (for example above) sub-pixels of the matrix of colored sub-pixels so that when the device is observed from above, a colored image appears.
  • the invention proposes to use an opaque layer with a white appearance which can be perforated to reveal colored subpixels which were masked by this opaque layer with a white appearance. It is thus possible to form pixels of the image with colored sub-pixels and a white contribution by the white opaque layer, and also entirely white pixels, which makes it possible to have a widened color gamut, and in particular colors brighter.
  • the invention also makes it possible to avoid the use of lenses, the manufacture of which can heat up the documents.
  • the opaque layer with a white appearance so that perforations can be made there.
  • this layer is opaque, so that the matrix of colored sub-pixels is not visible to the eye of a user through transparency, except by using, for example, a lamp on the back of the document.
  • opaque we mean a good level of opacity, for example a level which hides the matrix of colored sub-pixels, without using a lighting fixture under the device.
  • opaque as meaning that the opaque layer with a white appearance masks the matrix of colored sub-pixels for a user who observes it, without using a lighting device under the device (for example, lighting above the device is possible).
  • pixels are defined as regions comprising colored sub-pixels visible through one or more perforations, possibly a portion of the opaque layer with a white appearance, or even only a portion of the opaque layer.
  • white in appearance (which may correspond to a white subpixel).
  • a division of the image into pixels all having the same dimensions is possible. We understand that we can thus obtain a colored image with entirely white or partially white pixels, or even with no portion of the opaque layer which appears white.
  • the document further comprises a laserizable layer arranged above the opaque layer with a white appearance and configured to be laserized by application of a laser beam at at least one laserization wavelength.
  • a laserizable layer is such that the application of a laser beam to this layer generates gray levels visible by carbonization in this layer.
  • a laserizable layer can be a layer of transparent polycarbonate and can include additives sensitive to the passage of a laser beam because this beam causes them to carbonize.
  • Such a laserizable layer will be blackened or at least partially grayed throughout its thickness depending on the power of the laser since the additives sensitive to the passage of a laser beam are distributed uniformly throughout the thickness of the layer.
  • the use of the laserizable layer will make it possible to widen the color gamut towards dark colors, since completely black pixels can be obtained by laserization.
  • the laserizable layer can be transparent and therefore the opaque layer with a white appearance is more opaque than this layer.
  • the laserizable layer comprises portions blackened by laserization.
  • these blackened portions are above colored sub-pixels, to affect the perceived hue. Also, these blackened portions may be above portions of the white-appearing opaque layer or above perforations in this layer. From then on, we clearly understand how the color gamut is thus improved (a black channel is added).
  • the blackened portions improve the contrast of the colored images obtained.
  • the document further comprises a filter limiting the passage of at least the laserization wavelength, the filter being arranged between the laserizable layer and the opaque layer with a white appearance or, the laserizable layer is configured to form a filter limiting the passage of at least the laserization wavelength.
  • a filter is well suited for fragile white-appearing opaque layers, for example thin layers of metal oxides, which could be affected, for example perforated by the laser beam at the laserization wavelength .
  • the filter can either be a filter layer assembled by lamination, or, alternatively, be the laserizable layer itself.
  • a laserizable layer which filters ultraviolet (UV) radiation and which is sensitive to UV radiation can be used for laserization.
  • the opaque layer with a white appearance is chosen to be perforated by a laser beam of a perforation wavelength.
  • This particular embodiment makes it possible to personalize the colored image in a simple manner.
  • the perforation wavelength differs from the laserization wavelength.
  • this makes it possible to perforate the opaque layer with a white appearance without the laserizable layer being laserized.
  • a perforation wavelength in the infrared range can be used (the filter can be configured to let this wavelength pass).
  • a pixel of the colored image comprises a colored sub-pixel visible through a perforation and a white-appearing portion of the white-appearing opaque layer forming a white sub-pixel of the pixel.
  • the opaque layer with a white appearance comprises a metal oxide.
  • the invention also proposes a method of manufacturing a security document in which a matrix of colored sub-pixels is assembled with, above the matrix of colored sub-pixels, an opaque layer of white appearance, the method further comprising forming perforations through the white-appearing opaque layer and facing sub-pixels of the array of colored sub-pixels such that when the device is viewed from above, a colored image appears.
  • This process can be adapted for the manufacture of all embodiments of the security document as described above.
  • a laserizable layer is further assembled above the opaque layer with a white appearance and configured to be laserized by application of a laser beam at at least one laserization wavelength.
  • the laserizable layer is laserized to obtain blackened portions.
  • a filter is further assembled limiting the passage of at least the laserization wavelength, between the laserizable layer and the opaque layer with a white appearance.
  • This filter makes it possible to avoid degrading the opaque layer with a white appearance, which can be very fragile because it can be perforated, for example, by application of a laser beam.
  • This filter can be a filter which filters at least the laserization wavelength but which allows other wavelengths to pass.
  • the opaque layer with a white appearance is perforated by a laser beam of a perforation wavelength to obtain the perforations.
  • the perforation wavelength differs from the laserization wavelength (the perforation wavelength is preferably not filtered by the filter).
  • This particular embodiment proposes to use two different laser wavelengths, which is advantageous since the energy necessary for carbonization can be equal to several times that necessary for perforation.
  • the method comprises a registration phase in which the position of a group of colored sub-pixels is observed prior to the formation of the perforations which form the colored image.
  • the registration phase is a phase during which the position of the colored sub-pixels of the matrix of colored sub-pixels is determined, so that the formation of the perforations takes these positions into account.
  • the colored subpixels being arranged according to a matrix, they are aligned in two orthogonal directions.
  • the position of a sub-pixel of a given color at a position makes it possible to deduce the position of the other sub-pixels during registration.
  • the position of several colored sub-pixels makes it possible to implement an interpolation between these colored sub-pixels to deduce more precisely the position of the other sub-pixels, during registration.
  • the registration step facilitates the subsequent implementation of the formation of the perforations in the opaque layer with a white appearance, since it makes it possible to know the color of the sub-pixels which will be revealed by the perforations.
  • the colored sub-pixels of the group of colored sub-pixels are observable through one or more perforations of the opaque layer which appears white.
  • the perforations used in this step may not be the perforations that will be used for the colored image to appear, but perforations formed before those that will be used for the colored image to appear (although they may be visible within the colored image).
  • a set of trenches is formed in a grid-shaped pattern through the opaque layer with a white appearance.
  • these trenches are made by a demetallization process when the opaque layer with a white appearance is deposited.
  • This set of trenches makes it possible to improve the adhesion of the opaque layer with a white appearance to the other layers of the security document.
  • the position of the group of colored sub-pixels is observed through these trenches.
  • This mode of implementation is particularly advantageous since it uses the trenches which improve the adhesion of the opaque layer with a white appearance to the other layers of the security document to observe the sub-pixels and implement registration.
  • the trenches can be made during a step which is not that of forming the perforations, in particular, the trenches are here made before the perforations.
  • the images formed by these subpixels are customizable images, which may be different for each document, and which may be specific to each document user.
  • the documents described here may be physical identity documents such as a passport, an identity card, a driving license, a residence permit, etc.
  • the documents described here may be associated with a user, and the colored images that will be obtained may be images of the users' faces.
  • FIG. 1 there is a schematic representation of a document 100 obtained by the assembly of different layers, which may have been implemented by means of lamination.
  • the document 100 particularly comprises a matrix of colored sub-pixels 101, for example a transparent or opaque layer on which colored elements have been printed which each form colored sub-pixels.
  • the matrix of colored subpixels comprises sub-pixels having three possible colors, cyan sub-pixels SB, magenta sub-pixels SM, and yellow sub-pixels SJ.
  • CMY Cyan Magenta Yellow
  • the invention is not limited to this color model and can also use a model such as the RGB model (“Red Green Blue” in English, i.e. Red, Green, Blue). Of course, other color triplets that differ from CMY and RGB can be used.
  • the subpixels are arranged according to a matrix which will be described in more detail with reference to the Figure 4 .
  • a PM pattern of three sub-pixels SB, SM, and SJ is repeated several times in the section visible on the figure 1 .
  • an opaque layer of white appearance 102 has been assembled, for example a thin layer of metal oxide.
  • This layer can be chosen so that perforations can be formed in this layer easily, for example by application of a laser beam with a given wavelength called perforation wavelength.
  • This laserizable layer 103 is an initially transparent layer which contains particles which can be carbonized by application of a laser beam, and very particularly of a laser beam at a given wavelength called the laserization wavelength.
  • the application of the laser beam will create grayscale portions or even black portions in the laserizable layer.
  • the laserizable layer comprises polycarbonate and particles which react to laser beams.
  • a filter 104 is arranged between the laserizable layer 103 and the white-appearing opaque layer 102.
  • This filter is configured to limit the passage of 'a laser beam at the laserization wavelength, so that this wavelength does not reach the opaque layer with a white appearance.
  • this filter passes for the perforation wavelength mentioned above, which differs from the laserization wavelength.
  • the filter may comprise a layer of polymer (possibly of the same type of polymer as other layers of the document) but loaded with a substance which absorbs a given spectrum including the laserization wavelength. Transmittance of the filter is therefore weak on the laserization wavelength and stronger on other wavelengths (in particular the perforation wavelength).
  • the substance used may be different depending on whether it is desired to stop/filter infrared or ultraviolet radiation. It is also possible to use a layer of laserizable polycarbonate which also filters UV and which is laserized by UV radiation.
  • a layer of polycarbonate which carbonizes on the surface with a laser having UV radiation, and implement the perforation of the opaque layer of white appearance with low power infrared radiation (so that it does not carbonize not the laserizable layer).
  • a transparent intermediate layer 105 for example made of polycarbonate, is arranged between the white-appearing opaque layer 102 and the filter 104.
  • a protective layer 107 has been arranged which can be opaque or transparent, for example in polycarbonate.
  • FIG. 2 shows document 100 after a step in which PF perforations are formed in the opaque layer of white appearance has been implemented.
  • This step may include the application of a laser beam at the perforation wavelength.
  • a colored image appears when looking at the document 100, with brighter colors than in the techniques according to the prior art. It can be noted that the combination of patterns and perforations forms image pixels, but, as will be described below, those obtained after the optional laserization step are called pixels.
  • document 100 is shown after a laserization step has been implemented.
  • a laser beam was applied to the top of the document 100 to form blackened (or at least gray) portions in the thickness of the laserizable layer 103.
  • FIG. 4 a top view of the matrix of colored sub-pixels 101 is shown.
  • the surface occupied by the pixel PX1 described with reference to the Figure 3 is represented by a rectangle with broken lines.
  • colored lines are aligned in groups of three colors, i.e. three lines.
  • a fourth white line can be added to obtain brighter colors.
  • the addition of this fourth line will increase the size of the pixels and decrease the resolution of the images, while being less satisfactory in terms of color gamut because the maximum saturation possible colors will be weaker. Indeed when only 3 colors are present without white, each of them covers 1/3 of the surface, whereas if the white lines are present, each color only covers 1/4 of the surface, leading to a less saturation.
  • This registration phase (“registration” in English) is implemented prior to the formation of the perforations and aims to know the position of the colored sub-pixels of the matrix of colored sub-pixels, in particular in the event of deformation of this matrix. within a document.
  • the registration can be implemented automatically, for example by means of a computer system equipped with a camera to observe the documents.
  • these subpixels can be observed by initial perforations only used for registration.
  • the colored subpixels can be observed by transparency through the document, for example by using a powerful lighting device under the document.
  • This step is advantageous for sub-pixels having dimensions of around 60 to 70 micrometers, to ensure that a laser beam is applied above the correct sub-pixels to make an image appear on each document. colored with the right shades.
  • a document 100' is shown according to a variant in which a trench TR has been formed in an opaque layer of white appearance 102'.
  • the elements which bear the same references in this figure and on the figures 1 to 5 are the same.
  • This TR trench makes it possible to improve adhesion between the white-appearing opaque layer 102', which may comprise a metal oxide, and the other layers of the document which are for example made of polymer.
  • the laserizable layer 103' reacts, for laserization, to radiation with a laserization wavelength in the ultraviolet (UV) range.
  • This layer is further configured to act as a UV filter (carbonization can take place on the upper surface in the figure).
  • UV radiation does not affect the white-appearing opaque layer 102 and does not degrade it during laserization.
  • the opaque layer with a white appearance can nevertheless be perforated with a laser beam of a wavelength in the infrared range, for example of low intensity.
  • the laserizable layer 103' can be configured to let this infrared laser beam pass.
  • This embodiment is advantageous in that it requires fewer layers to form a document.
  • the perforations described here can have dimensions of the order of those of a sub-pixel or even dimensions smaller than those of a sub-pixel.
  • the blackened portions can also have dimensions of the order of those of a sub-pixel or even dimensions smaller than those of a sub-pixel. We understand that this allows for fine adjustment of the colors of each pixel.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)
EP23186957.9A 2022-09-28 2023-07-21 Sicherheitsdokument und entsprechendes herstellungsverfahren mit einer perforierten lichtundurchlässigen schicht über einer matrix aus farbigen subpixeln Pending EP4344897A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2209844A FR3140012A1 (fr) 2022-09-28 2022-09-28 Document de sécurité comprenant une couche opaque d’apparence blanche perforée au-dessus d’une matrice de sous-pixels colorés

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Publication Number Publication Date
EP4344897A1 true EP4344897A1 (de) 2024-04-03

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EP23186957.9A Pending EP4344897A1 (de) 2022-09-28 2023-07-21 Sicherheitsdokument und entsprechendes herstellungsverfahren mit einer perforierten lichtundurchlässigen schicht über einer matrix aus farbigen subpixeln

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US (1) US20240100875A1 (de)
EP (1) EP4344897A1 (de)
FR (1) FR3140012A1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050001419A1 (en) * 2003-03-21 2005-01-06 Levy Kenneth L. Color laser engraving and digital watermarking
JP2005219296A (ja) * 2004-02-04 2005-08-18 National Printing Bureau 画像形成体
FR2972553A1 (fr) 2011-03-10 2012-09-14 Jean Pierre Lazzari Procede de realisation d'une image laser couleur retro eclairee, document identitaire mettant en oeuvre ce procede et systeme de retro eclairage
WO2016030315A1 (de) * 2014-08-26 2016-03-03 Bundesdruckerei Gmbh Farbige lasergravur
FR3055112A1 (fr) * 2016-08-19 2018-02-23 Oberthur Technologies Document de securite comprenant une couche laserisable et un motif a eclairer pour colorer une image en niveaux de gris, et procedes de fabrication et de lecture correspondants.
WO2019034398A1 (de) * 2017-08-15 2019-02-21 Leonhard Kurz Stiftung & Co. Kg Dokument, verfahren zur herstellung eines dokuments sowie eine vorrichtung zur durchführung eines verfahrens
FR3079052A1 (fr) 2018-03-16 2019-09-20 Idemia France Document apte a generer une image couleur
EP3828000A1 (de) * 2019-11-29 2021-06-02 IDEMIA France Sicherheitsdokument und dessen herstellungsverfahren, die ein individuell gestaltes bild auf der basis eines metallhologramm betreffen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050001419A1 (en) * 2003-03-21 2005-01-06 Levy Kenneth L. Color laser engraving and digital watermarking
JP2005219296A (ja) * 2004-02-04 2005-08-18 National Printing Bureau 画像形成体
FR2972553A1 (fr) 2011-03-10 2012-09-14 Jean Pierre Lazzari Procede de realisation d'une image laser couleur retro eclairee, document identitaire mettant en oeuvre ce procede et systeme de retro eclairage
WO2016030315A1 (de) * 2014-08-26 2016-03-03 Bundesdruckerei Gmbh Farbige lasergravur
FR3055112A1 (fr) * 2016-08-19 2018-02-23 Oberthur Technologies Document de securite comprenant une couche laserisable et un motif a eclairer pour colorer une image en niveaux de gris, et procedes de fabrication et de lecture correspondants.
WO2019034398A1 (de) * 2017-08-15 2019-02-21 Leonhard Kurz Stiftung & Co. Kg Dokument, verfahren zur herstellung eines dokuments sowie eine vorrichtung zur durchführung eines verfahrens
FR3079052A1 (fr) 2018-03-16 2019-09-20 Idemia France Document apte a generer une image couleur
EP3828000A1 (de) * 2019-11-29 2021-06-02 IDEMIA France Sicherheitsdokument und dessen herstellungsverfahren, die ein individuell gestaltes bild auf der basis eines metallhologramm betreffen

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FR3140012A1 (fr) 2024-03-29

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