EP2794279B1 - Method for forming color laser images, and resulting document - Google Patents

Method for forming color laser images, and resulting document Download PDF

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Publication number
EP2794279B1
EP2794279B1 EP12818795.2A EP12818795A EP2794279B1 EP 2794279 B1 EP2794279 B1 EP 2794279B1 EP 12818795 A EP12818795 A EP 12818795A EP 2794279 B1 EP2794279 B1 EP 2794279B1
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EP
European Patent Office
Prior art keywords
layer
document
image
pixels
latent image
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EP12818795.2A
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German (de)
French (fr)
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EP2794279A1 (en
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Jean-Pierre Lazzari
Jean Marc Lazzari
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Individual
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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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
    • 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
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • 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
    • B42D25/20—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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • 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
    • B42D25/324—Reliefs
    • 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
    • B42D25/405—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
    • B42D25/425—Marking by deformation, e.g. embossing
    • 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
    • B42D25/455—Associating two or more layers using heat
    • 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
    • B42D25/46—Associating two or more layers using pressure

Definitions

  • the present invention relates to a method of forming color laser images. It finds applications particularly in identity images relating to identity documents: identity cards, credit cards, vital cards, passports, driving licenses, secure entry badges, etc.
  • the patent WO 2011/124774 A1 describes a method of personalization of embedded images, for documents, identity, comprising a latent image, composed of a matrix of pixels consisting of sub-colored pixels, embedded in a transparent protective layer.
  • a latent image composed of a matrix of pixels consisting of sub-colored pixels, embedded in a transparent protective layer.
  • gray levels are created on subpixels by covering them with a black non-reflecting surface, through the transparent protective layer, creating the gray levels of the image definitive color laser.
  • This treatment allows the personalization of the latent image, consisting of colored sub-pixels.
  • the image thus personalized is observed by reflection through the transparent protective layer.
  • the personalized image must be sufficiently reflective, to be observed in ambient light, without the use of an additional light source.
  • Patent Application No. 11/00578 describes a method for producing a high-efficiency reflective laser image, comprising a latent image consisting of sub-colored pixels, surrounded by transparent non-colored areas, covered with a protective layer transparent sensitive to laser radiation, which will be called thereafter, "lasérisable layer".
  • a laser beam causes black, non-reflective surfaces, which more or less cover the surfaces of colored sub-pixels, and unstained surfaces, to appear in this layer of laserisable protection, in order to reveal the gray levels of a personalized image.
  • the personalized image is seen by reflection on underlying reflective sub-layers, especially white, or through varnish, to increase the reflectivity of the image.
  • the reflectivity of the image is fundamental, because it must allow the eye to integrate by additive composition the light beams in subpixel colors, and unstained areas, emitted by inverse reflection of the incident light.
  • the non-reflective black surfaces forming the gray levels of the personalized image, located either on the sub-pixels, or above the sub pixels of the latent image, form shadow effects, which darken the image. final personalized image.
  • the present invention aims to overcome the disadvantages of the state of the art, improving the quality of the final personalized image.
  • the invention proposes that the non-reflecting surfaces constituting the gray levels of the final personalized image be formed under the latent image constituted by colored sub-pixels.
  • the subject of the invention is a method for forming personalized color laser images from an assembly comprising a transparent protective layer, a latent image printed matter consisting of colored sub-pixels and non-colored surfaces, a laserizable layer under the latent image, reflecting means and a laser beam which through the protective layer, through the sub-pixels of the latent image, and unstained surfaces, forms in the laserizable layer the gray levels of a definitive personalized image, the whole being laminated on a support.
  • the gray levels leading to the customization of the latent image to form the final image are calculated using software, which from the original image, sub-pixel segments, calculates the corresponding shades of colors and determines the gray levels to be carbonized in the laserizable layer, under the colored sub-pixels and the unstained areas of the latent image, in order to obtain the same shades of colors as those of the image of origin.
  • the gray levels of the personalized image are obtained by the degree of blackening which is made proportional to the energy deposited by the laser, thanks to linearization software, known to those skilled in the art, as well as by variable areas of carbonization.
  • the energy of the laser beam is further adjusted according to the color of the subpixels, and the unstained areas that it passes through, because according to the color of the subpixels, the transparency of the uncolored areas, the laser energy required must be adjusted.
  • Laserizable materials which by carbonization under the effect of a laser beam, form the gray levels of the customized image are, by way of non-limiting examples, polycarbonates, certain polyvinyl chloride treated, acrylonitrile-butadiene treated styrenes, or treated polyethylene terephthalates.
  • the thickness of the lasérisable layer or the thickness of the doped portion of the document medium are as thin as possible, compatible with the required gray levels. This thickness may advantageously be between a few microns and a hundred microns.
  • the colored sub-pixels are printed by offset, inkjet, or any other technique known to those skilled in the art. Unstained areas, or unstained sub pixels, increase the reflectivity of the final image.
  • the colored sub-pixels, and the non-colored areas are organized in parallel columns, or in small uniformly distributed areas.
  • the latent image may consist of triplets or quadruplets of colored sub pixels.
  • the color of the sub-pixels is preferably chosen from among the independent colors, that is to say that the mixture of two of them can not form a third color of sub-pixels.
  • the colors red, green blue, or yellow, magenta and cyan are part of these colors.
  • the protective layer, and the layer of laserizable material are heat-welded under pressure on the body of the identity document trapping the matrix of colored sub-pixels and the non-colored areas, between the protective layer, and the layer of lasérisable material.
  • the protective layer may be molded to give it specific shapes, such as a lens array, allowing the laser beam at particular angles of incidence, to engrave under the latent image, the personalization of several separate color laser images.
  • the laser carbonization which causes the gray levels to appear, more or less obstruct the incident light, and the reflected light passing through the colored sub-pixels, and the unstained areas of the latent image, thus limiting the parasitic reflections and the effects of shading that obscure the final personalized image.
  • the invention also relates to a document comprising a personalized laser image produced by the implementation of the method above.
  • This document comprises a transparent protection sheet, a latent image consisting of a matrix of colored sub-pixels and non-colored areas, a layer of laserizable materials located under the latent image, this sheet being at least partially carbonized by laser radiation, and a document support.
  • the protective sheet, the latent image, the lasérisable layer, and the support are able to be laminated together.
  • the figure 1 shows the section, according to the prior art of an identity document comprising a color laser image.
  • the transparent protective layer (4) the lasérisable layer (3), the matrix of sub-pixels are laminated on the body of the identity document (1) .
  • La black surface (5) produced by carbonization by the laser beam, is located directly above the colored sub-pixel ( 2) the latent image. If the ambient light rays (6) incident are not perfectly perpendicular to the plane of the document, then, the shadow carried by the black surface (5) on the colored sub-pixel (2), extends well beyond the surface of this sub-pixel by creating a shadow zone (7) that darkens the personalized image.
  • the figure 2 shows the section of a first embodiment of the invention.
  • the body (1) of the identity document is white. It is doped on the surface, in order to create a layer (3) lasérisable.
  • the latent image comprising the sub-colored pixels (2) and the unstained areas, is printed. Alternatively, it can be printed on the transparent protective layer (4).
  • the protective layer (4) is laminated on this assembly.
  • the laser beam (8) forms in the laserizable layer (3) the gray levels (5) of the final personalized image. No shadow zone appears according to the invention.
  • the figure 3 shows the section of a second embodiment of the invention.
  • a layer of lasérisable material (3) is laminated.
  • the colored sub-pixels (2) are printed also comprising the unstained areas, the assembly constituting the latent image.
  • the colored sub-pixels (2) can be printed on the protective layer.
  • the protective layer (4) is laminated on the assembly.
  • the figure 4 shows the section of a third embodiment of the invention.
  • the lasérisable layer (3) is obtained by surface doping of the card body (1).
  • this lasérisable layer (3) is laminated on the card body (1).
  • the latent image (2) comprising the colored sub-pixels, and the uncolored areas, is printed on the lasérisable layer (3).
  • the latent image may be printed on the protective layer (4).
  • the protective layer (4) is laminated to the previous assembly. During the lamination, its upper surface viewed from the side of the observer, is hot pressed to form a lens array (9).

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Credit Cards Or The Like (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laser Beam Printer (AREA)
  • Color Electrophotography (AREA)

Description

Domaine d'application de l'invention:Field of application of the invention

La présente invention concerne un procédé de formation d'images laser couleur. Elle trouve des applications notamment dans les images d'identité relatives aux documents identitaires : cartes d'identité, cartes de crédit, cartes vital, passeports, permis de conduire, badges d'entrée sécurisés, etc.The present invention relates to a method of forming color laser images. It finds applications particularly in identity images relating to identity documents: identity cards, credit cards, vital cards, passports, driving licenses, secure entry badges, etc.

Etat de l'art antérieur:State of the prior art:

Le brevet WO 2011/124774 A1 , décrit un procédé de personnalisation d'images latentes encastrées, pour documents, identitaires, comprenant une image latente, composée d'une matrice de pixels constitués de sous pixels colorés, encastrée sous une couche de protection transparente. A l'aide d'un faisceau laser, des niveaux de gris sont créés sur les sous pixels en les recouvrant d'une surface non réfléchissante noire, au travers de la couche transparente de protection, créant ainsi les niveaux de gris de l'image laser couleur définitive. Ce traitement permet la personnalisation de l'image latente, constituée des sous pixels colorés.The patent WO 2011/124774 A1 , describes a method of personalization of embedded images, for documents, identity, comprising a latent image, composed of a matrix of pixels consisting of sub-colored pixels, embedded in a transparent protective layer. Using a laser beam, gray levels are created on subpixels by covering them with a black non-reflecting surface, through the transparent protective layer, creating the gray levels of the image definitive color laser. This treatment allows the personalization of the latent image, consisting of colored sub-pixels.

L'image ainsi personnalisée, est observée par réflexion au travers de la couche transparente de protection. L'image personnalisée doit être suffisamment réfléchissante, pour être observée en lumière ambiante, sans le recours à une source lumineuse additionnelle.The image thus personalized is observed by reflection through the transparent protective layer. The personalized image must be sufficiently reflective, to be observed in ambient light, without the use of an additional light source.

La demande de brevet n° 11/00578 , décrit un procédé de réalisation d'une image laser à haut rendement réflectif, comprenant une image latente constituée de sous pixels colorés, entourés de zones transparentes non colorées, recouverts d'une couche de protection transparente sensible au rayonnement laser, que l'on nommera par la suite, « couche lasérisable ». Un faisceau laser fait apparaître dans cette couche de protection lasérisable, des surfaces noires, non réfléchissantes, qui recouvrent plus ou moins les surfaces des sous pixels colorés,et des surfaces non colorées, afin de faire apparaître les niveaux de gris d'une image personnalisée. L'image personnalisée est vue par réflexion sur des sous couches réfléchissantes sous jacentes, notamment blanches, ou au travers de vernis, afin d'augmenter la réflectivité de l'image. La réflectivité de l'image est fondamentale, car elle doit permettre à l'oeil d'intégrer par composition additive les faisceaux lumineux aux couleurs des sous pixels,et des zones non colorées, émis par réflexion inverse de la lumière incidente.Patent Application No. 11/00578 , describes a method for producing a high-efficiency reflective laser image, comprising a latent image consisting of sub-colored pixels, surrounded by transparent non-colored areas, covered with a protective layer transparent sensitive to laser radiation, which will be called thereafter, "lasérisable layer". A laser beam causes black, non-reflective surfaces, which more or less cover the surfaces of colored sub-pixels, and unstained surfaces, to appear in this layer of laserisable protection, in order to reveal the gray levels of a personalized image. . The personalized image is seen by reflection on underlying reflective sub-layers, especially white, or through varnish, to increase the reflectivity of the image. The reflectivity of the image is fundamental, because it must allow the eye to integrate by additive composition the light beams in subpixel colors, and unstained areas, emitted by inverse reflection of the incident light.

Bien qu'intéressantes à certains égards, ces structures limitent néanmoins la qualité de l'image personnalisée. En effet, les surfaces noires non réfléchissantes, formant les niveaux de gris de l'image personnalisée, se situant soit sur les sous pixels, soit au dessus des sous pixels de l'image latente, forment des effets d'ombre, qui assombrissent l'image personnalisée définitive.Although interesting in some respects, these structures nevertheless limit the quality of the personalized image. Indeed, the non-reflective black surfaces, forming the gray levels of the personalized image, located either on the sub-pixels, or above the sub pixels of the latent image, form shadow effects, which darken the image. final personalized image.

Exposé de l'invention :Presentation of the invention

La présente invention, a pour but de remédier aux inconvénients de l'état de la technique, en améliorant la qualité de l'image personnalisée définitive. Pour ce faire l'invention propose que les surfaces non réfléchissantes constituant les niveaux de gris de l'image personnalisée définitive, soient formées sous l'image latente constituée de sous pixels colorés.The present invention aims to overcome the disadvantages of the state of the art, improving the quality of the final personalized image. To this end, the invention proposes that the non-reflecting surfaces constituting the gray levels of the final personalized image be formed under the latent image constituted by colored sub-pixels.

De façon plus précise, l'invention a pour objet un procédé de formation d'images laser couleur personnalisées à partir d'un assemblage comprenant une couche de protection transparente, une image latente imprimée constituée de sous pixels colorés et de surfaces non colorées, une couche lasérisable sous l'image latente, des moyens réfléchissants et un faisceau laser qui au travers de la couche de protection, au travers des sous pixels de l'image latente,et des surfaces non colorées, forme dans la couche lasérisable les niveaux de gris d'une image personnalisée définitive, l'ensemble étant laminé sur un support.More specifically, the subject of the invention is a method for forming personalized color laser images from an assembly comprising a transparent protective layer, a latent image printed matter consisting of colored sub-pixels and non-colored surfaces, a laserizable layer under the latent image, reflecting means and a laser beam which through the protective layer, through the sub-pixels of the latent image, and unstained surfaces, forms in the laserizable layer the gray levels of a definitive personalized image, the whole being laminated on a support.

Les niveaux de gris conduisant à la personnalisation de l'image latente pour former l'image définitive, sont calculés à l'aide d'un logiciel, qui à partir de l'image d'origine, la segmente en sous pixels, calcule les nuances de couleurs correspondantes et détermine les niveaux de gris à carboniser dans la couche lasérisable, sous les sous pixels colorés et les zones non colorées de l'image latente, afin d'obtenir les mêmes nuances de couleurs que celles de l'image d'origine.The gray levels leading to the customization of the latent image to form the final image, are calculated using software, which from the original image, sub-pixel segments, calculates the corresponding shades of colors and determines the gray levels to be carbonized in the laserizable layer, under the colored sub-pixels and the unstained areas of the latent image, in order to obtain the same shades of colors as those of the image of origin.

Les niveaux de gris de l'image personnalisée, sont obtenus par le degré de noircissement qui est rendu proportionnel à l'énergie déposée par le laser, grâce à un logiciel de linéarisation, connu de l'homme de l'art, ainsi que par des surfaces variables de carbonisation.The gray levels of the personalized image are obtained by the degree of blackening which is made proportional to the energy deposited by the laser, thanks to linearization software, known to those skilled in the art, as well as by variable areas of carbonization.

L'énergie du faisceau laser, est de plus ajustée en fonction de la couleur des sous pixels, et des zones non colorées qu'il traverse, car selon la couleur des sous pixels, la transparence des zones non colorées , l'énergie laser requise doit être ajustée.The energy of the laser beam, is further adjusted according to the color of the subpixels, and the unstained areas that it passes through, because according to the color of the subpixels, the transparency of the uncolored areas, the laser energy required must be adjusted.

Des matériaux lasérisables qui par carbonisation sous l'effet d'un faisceau laser, forment les niveaux de gris de l'image personnalisée, sont, à titre d'exemples non limitatifs, des polycarbonates, certains polychlorures de vinyle traités, des acrylonitrille-butadiène-styrènes traités, ou des poly-téréphtalates d'éthylène traités.Laserizable materials which by carbonization under the effect of a laser beam, form the gray levels of the customized image are, by way of non-limiting examples, polycarbonates, certain polyvinyl chloride treated, acrylonitrile-butadiene treated styrenes, or treated polyethylene terephthalates.

Selon des modes de mise en oeuvre particuliers de l'invention :

  • -- le support du document identitaire est de couleur blanche, et dopé en surface, afin d'être sensible au rayonnement laser pour former les niveaux de gris de l'image personnalisée, surface sur laquelle l'image latente constituée de sous pixels colorée et de zones non colorées, est imprimée.
  • --les sous pixels colorés de l'image latente sont imprimés sur la surface de la couche de protection destinée à être laminée sur la couche lasérisable.
  • --la couche lasérisable est transparente. Elle est laminée sur une surface réfléchissante qui peut avantageusement être constituée par le corps du document de couleur blanche.
  • --le corps du document est transparent.
  • --la couche de protection est formée à chaud lors du laminage, pour former un réseau de lentilles.
According to particular embodiments of the invention:
  • the support of the identity document is white in color and doped on the surface so as to be sensitive to laser radiation in order to form the gray levels of the personalized image, on which surface the latent image consisting of colored sub-pixels and uncolored areas, is printed.
  • the colored sub-pixels of the latent image are printed on the surface of the protective layer intended to be laminated on the lasérisable layer.
  • the lasérisable layer is transparent. It is laminated on a reflecting surface which may advantageously be constituted by the body of the white document.
  • - The body of the document is transparent.
  • --The protective layer is formed hot during rolling, to form a lens array.

L'épaisseur de la couche lasérisable ou l'épaisseur de la partie dopée du support de document, sont les plus minces possibles, compatibles avec les niveaux de gris requis. Cette épaisseur peut avantageusement être comprise entre quelques microns, et une centaine de microns.The thickness of the lasérisable layer or the thickness of the doped portion of the document medium are as thin as possible, compatible with the required gray levels. This thickness may advantageously be between a few microns and a hundred microns.

Les sous pixels colorés sont imprimés par offset, jet d'encre, ou toute autre technique connue de l'homme de l'art. Des zones non colorées, ou des sous pixels non colorés, augmentent la réflectivité de l'image définitive. Les sous pixels colorés, et les zones non colorées sont organisés en colonnes parallèles, ou en petites surfaces uniformément réparties. L'image latente peut être constituée de triplets ou de quadruplets de sous pixels colorés. La couleur des sous pixels est de préférence choisie parmi les couleurs indépendantes, c'est-à-dire que le mélange de deux d'entre elles , ne peut former une troisième couleur de sous pixels. Les couleurs rouges, vert bleues, ou jaunes, magenta et cyan font partie de ces couleurs.The colored sub-pixels are printed by offset, inkjet, or any other technique known to those skilled in the art. Unstained areas, or unstained sub pixels, increase the reflectivity of the final image. The colored sub-pixels, and the non-colored areas are organized in parallel columns, or in small uniformly distributed areas. The latent image may consist of triplets or quadruplets of colored sub pixels. The color of the sub-pixels is preferably chosen from among the independent colors, that is to say that the mixture of two of them can not form a third color of sub-pixels. The colors red, green blue, or yellow, magenta and cyan are part of these colors.

Dans la seconde étape de fabrication, appelée « laminage » la couche de protection, et la couche de matériau lasérisable, sont soudées à chaud sous pression sur le corps du document identitaire emprisonnant la matrice de sous pixels colorés et les zones non colorées, entre la couche de protection, et la couche de matériau lasérisable.In the second manufacturing step, called "rolling", the protective layer, and the layer of laserizable material, are heat-welded under pressure on the body of the identity document trapping the matrix of colored sub-pixels and the non-colored areas, between the protective layer, and the layer of lasérisable material.

Selon une autre variante de l'invention, lors du laminage, la couche de protection peut être moulée pour lui donner des formes spécifiques, comme un réseau de lentilles, permettant au faisceau laser selon des angles d'incidences particuliers, de graver sous l'image latente, la personnalisation de plusieurs images laser couleur distinctes.According to another variant of the invention, during rolling, the protective layer may be molded to give it specific shapes, such as a lens array, allowing the laser beam at particular angles of incidence, to engrave under the latent image, the personalization of several separate color laser images.

La carbonisation laser qui fait apparaître les niveaux de gris, obstruent plus ou moins la lumière incidente, et la lumière réfléchie qui traverse les sous pixels colorés, et les zones non colorées de l'image latente, limitant ainsi les réflexions parasites et des effets d'ombrage qui obscurcissent l'image personnalisée définitive.The laser carbonization, which causes the gray levels to appear, more or less obstruct the incident light, and the reflected light passing through the colored sub-pixels, and the unstained areas of the latent image, thus limiting the parasitic reflections and the effects of shading that obscure the final personalized image.

L'invention concerne également un document comportant une image laser personnalisée réalisée par la mise en oeuvre du procédé ci-dessus.The invention also relates to a document comprising a personalized laser image produced by the implementation of the method above.

Ce document comporte une feuille de protection transparente, une image latente constituée d'une matrice de sous pixels colorés et de zones non colorées, une couche en matériaux lasérisable située sous l'image latente cette feuille étant au moins partiellement carbonisée par un rayonnement laser, et un support de document. La feuille de protection, l'image latente, la couche lasérisable, et le support sont aptes à être laminés ensemble.This document comprises a transparent protection sheet, a latent image consisting of a matrix of colored sub-pixels and non-colored areas, a layer of laserizable materials located under the latent image, this sheet being at least partially carbonized by laser radiation, and a document support. The protective sheet, the latent image, the lasérisable layer, and the support are able to be laminated together.

Selon des modes de réalisation particuliers :

  • la couche lasérisable est obtenue par dopage en surface du corps du document de couleur blanche, l'image latente constituée de sous pixels colorés et de zones non colorées est imprimée sur la surface dopée du corps du document.
  • les sous pixels de l'image latente sont imprimés sur la surface de la couche de protection destinée à être laminée sur la couche lasérisable.
  • la couche lasérisable est transparente. Elle est laminée sur une surface réfléchissante qui peut avantageusement être constituée par le corps du document de couleur blanche.
    • --le corps du document est transparent.
    • --la couche de protection est formée à chaud lors du laminage, pour lui donner la forme d'un réseau de lentilles permettant au laser de graver sur l'image latente, plusieurs images laser couleur personnalisées distinctes.
According to particular embodiments:
  • the lasérisable layer is obtained by surface doping of the body of the white color document, the latent image consisting of colored subpixels and non-colored areas. stained is printed on the doped surface of the body of the document.
  • the sub pixels of the latent image are printed on the surface of the protective layer to be laminated on the lasérisable layer.
  • the lasérisable layer is transparent. It is laminated on a reflecting surface which may advantageously be constituted by the body of the white document.
    • - The body of the document is transparent.
    • --The protective layer is formed hot during rolling, to give it the shape of a network of lenses allowing the laser to burn on the latent image, several separate personalized color laser images.

Présentation des figures :Presentation of the figures:

L'invention apparaîtra mieux après la description qui suit, donnée à titre explicatif et nullement limitatif. Cette description se réfère aux dessins annexés, sur lesquels :

  • --La figure 1 montre la coupe, selon l'art antérieur d'un document identitaire comportant une image laser couleur
  • --La figure 2 montre la coupe d'un premier mode de mise en oeuvre e l'invention
  • --La figure 3 montre la coupe d'un second mode de mise en oeuvre de l'invention.
  • --La figure 4 montre la coupe d'un troisième mode de mise en oeuvre de l'invention.
The invention will appear better after the description which follows, given for explanatory purposes and in no way limiting. This description refers to the accompanying drawings, in which:
  • --The figure 1 shows the section according to the prior art of an identity document comprising a color laser image
  • --The figure 2 shows the section of a first mode of implementation e the invention
  • --The figure 3 shows the section of a second embodiment of the invention.
  • --The figure 4 shows the section of a third embodiment of the invention.

Description détaillée :Detailed description :

La figure 1 montre la coupe, selon l'art antérieur d'un document identitaire comprenant une image laser couleur. La couche de protection transparente (4) la couche lasérisable (3), la matrice de sous pixels sont laminées sur le corps du document identitaire (1).La surface (5) noire, produite par carbonisation par le faisceau laser, se situe à l'aplomb du sous pixel coloré (2) de l'image latente. Si les rayons lumineux ambiants (6) incidents, ne sont pas parfaitement perpendiculaires au plan du document, alors, l'ombre portée par la surface noire (5) sur le sous pixel coloré (2), déborde largement la surface de ce sous pixel en créant une zone d'ombre (7) qui assombrit l'image personnalisée.The figure 1 shows the section, according to the prior art of an identity document comprising a color laser image. The transparent protective layer (4) the lasérisable layer (3), the matrix of sub-pixels are laminated on the body of the identity document (1) .La black surface (5), produced by carbonization by the laser beam, is located directly above the colored sub-pixel ( 2) the latent image. If the ambient light rays (6) incident are not perfectly perpendicular to the plane of the document, then, the shadow carried by the black surface (5) on the colored sub-pixel (2), extends well beyond the surface of this sub-pixel by creating a shadow zone (7) that darkens the personalized image.

La figure 2 montre la coupe d'un premier mode de mise en oeuvre de l'invention. Le corps (1) du document identitaire est blanc. Il est dopé en surface, afin de créer une couche (3) lasérisable. Sur cette couche (3), l'image latente comportant les sous pixels colorés (2) et les zones non colorées, est imprimée. Alternativement, elle peut être imprimée sur la couche de protection transparente (4). La couche de protection (4) est laminée sur cet ensemble. Le faisceau laser (8) forme dans la couche lasérisable (3) les niveaux de gris (5) de l'image personnalisée définitive. Aucune zone d'ombre n'apparaît selon l'invention.The figure 2 shows the section of a first embodiment of the invention. The body (1) of the identity document is white. It is doped on the surface, in order to create a layer (3) lasérisable. On this layer (3), the latent image comprising the sub-colored pixels (2) and the unstained areas, is printed. Alternatively, it can be printed on the transparent protective layer (4). The protective layer (4) is laminated on this assembly. The laser beam (8) forms in the laserizable layer (3) the gray levels (5) of the final personalized image. No shadow zone appears according to the invention.

La figure 3 montre la coupe d'un second mode de mise en oeuvre de l'invention. Sur le corps de carte (1) une couche de matériau lasérisable (3) est laminée. Sur cette couche lasérisable (3) les sous pixels colorés (2) sont imprimés comprenant également les zones non colorées, l'ensemble constituant l'image latente. Alternativement, les sous pixels colorés (2) peuvent être imprimée sur la couche de protection.
Puis la couche de protection (4) est laminée sur l'ensemble.The figure 3 shows the section of a second embodiment of the invention. On the card body (1) a layer of lasérisable material (3) is laminated. On this lasérisable layer (3) the colored sub-pixels (2) are printed also comprising the unstained areas, the assembly constituting the latent image. Alternatively, the colored sub-pixels (2) can be printed on the protective layer.
Then the protective layer (4) is laminated on the assembly.

La figure 4 montre la coupe d'un troisième mode de mise en oeuvre de l'invention. Sur le corps de carte (1), la couche lasérisable (3) est obtenue par dopage en surface du corps de carte (1). Selon une variante, cette couche lasérisable (3) est laminée sur le corps de cartes (1). L'image latente (2) comportant les sous pixels colorés, et les zones non colorées, est imprimée sur la couche lasérisable (3). Alternativement, l'image latente peut être imprimée sur la couche de protection (4). La couche de protection (4) est laminée sur l'ensemble précédent. Au cours de la lamination, sa surface supérieure vue du coté de l'observateur, est pressée à chaud pour former un réseau de lentilles (9). Les rayons laser (8) et (8') ayant un certain angle d'incidence par rapport au plan du document, forment par carbonisation dans la couche lasérisable (3), sous les sous pixels colorés (2) de l'image latente, deux images personnalisées distinctes (5) et (5'). Par réflexion inverse de la lumière incidente, ces deux images laser couleurs sont vues séparément. Selon une alternative, trois image laser personnalisées sont réalisées.The figure 4 shows the section of a third embodiment of the invention. On the card body (1), the lasérisable layer (3) is obtained by surface doping of the card body (1). According to one variant, this lasérisable layer (3) is laminated on the card body (1). The latent image (2) comprising the colored sub-pixels, and the uncolored areas, is printed on the lasérisable layer (3). Alternatively, the latent image may be printed on the protective layer (4). The protective layer (4) is laminated to the previous assembly. During the lamination, its upper surface viewed from the side of the observer, is hot pressed to form a lens array (9). The laser beams (8) and (8 ') having a certain angle of incidence relative to the plane of the document, form by carbonization in the lasérisable layer (3), under the colored sub-pixels (2) of the latent image, two separate custom images (5) and (5 '). By inverse reflection of the incident light, these two color laser images are seen separately. According to one alternative, three personalized laser images are produced.

Claims (9)

  1. A method for forming customized color laser images from an assembly comprising a transparent protective layer, a printed so-called "latent" image made up of colored sub-pixels and noncolored surfaces, a laserable layer below the latent image, reflective means and a laser beam which, through the protective layer, through the sub-pixels of the latent image, and the noncolored surfaces, forms, in the laserable layer, the gray levels leading to the customization of the latent image to form a final customized image, the assembly being laminated on a support.
  2. The method for forming customized color laser images according to claim 1, wherein the laserable layer (3) is obtained by surface doping of the card body (1).
  3. The method for forming customized color laser images according to claim 1, wherein the laserable layer (3) is laminated on the card body (1).
  4. The method for forming customized color laser images according to any one of claims 1 to 3, wherein the latent image comprising the sub-pixels (2) and the noncolored zones is printed on the surface of the laserable layer (3).
  5. The method for forming customized color laser images according to any one of claims 1 to 4, wherein the upper face of the protective layer (4) is hot-pressed to form an array of lenses (9) making it possible to etch several separate customized color laser images.
  6. A document including customized color laser images, made by implementing the method according to any one of the preceding claims, characterized in that it includes a transparent protective sheet, a so-called "latent" image made up of a matrix of colored sub-pixels and noncolored zones, a layer made from laserable materials located below the latent image, said sheet being at least partially carbonized by laser radiation, and a document support, the protective sheet, the latent image, the laserable layer, and the support being able to be laminated together.
  7. The document according to claim 6, wherein the protective layer (4) forms an array of lenses (9) on the surface.
  8. The document according to claim 6, wherein the document body (1) is white.
  9. The document according to claim 6, wherein the document body (1) is transparent.
EP12818795.2A 2011-12-19 2012-12-05 Method for forming color laser images, and resulting document Revoked EP2794279B1 (en)

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FR1103919A FR2984217B1 (en) 2011-12-19 2011-12-19 METHOD FOR FORMING COLOR LASER IMAGES AND DOCUMENT THUS PRODUCED
PCT/FR2012/000501 WO2013093230A1 (en) 2011-12-19 2012-12-05 Method for forming color laser images, and resulting document

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US10112429B2 (en) 2018-10-30
FR2984217B1 (en) 2014-06-06
HUE043308T2 (en) 2019-08-28
FR2984217A1 (en) 2013-06-21
ES2720870T3 (en) 2019-07-25
PL2794279T3 (en) 2019-08-30

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