EP3375622A1 - Procédé d'optimisation d'une image laser couleur et document sur lequel une image laser couleur est ainsi produite - Google Patents

Procédé d'optimisation d'une image laser couleur et document sur lequel une image laser couleur est ainsi produite Download PDF

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Publication number
EP3375622A1
EP3375622A1 EP17305284.6A EP17305284A EP3375622A1 EP 3375622 A1 EP3375622 A1 EP 3375622A1 EP 17305284 A EP17305284 A EP 17305284A EP 3375622 A1 EP3375622 A1 EP 3375622A1
Authority
EP
European Patent Office
Prior art keywords
image
laser
subpixels
color
print
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.)
Withdrawn
Application number
EP17305284.6A
Other languages
German (de)
English (en)
Inventor
Jean-Luc Lesur
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.)
Thales DIS France SA
Original Assignee
Gemalto SA
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 Gemalto SA filed Critical Gemalto SA
Priority to EP17305284.6A priority Critical patent/EP3375622A1/fr
Priority to EP18707394.5A priority patent/EP3595907A1/fr
Priority to PCT/EP2018/055358 priority patent/WO2018166832A1/fr
Publication of EP3375622A1 publication Critical patent/EP3375622A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • 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
    • B41M5/28—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
    • B41M5/286—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 using compounds undergoing unimolecular fragmentation to obtain colour shift, e.g. bleachable dyes

Definitions

  • the present invention generally relates to a method of forming a color laser image with a white background, and a document having a color laser image made thereon in this way.
  • the present invention relates to a personalization method of secure documents by selectively producing gray levels pixel by laser carbonization and by revealing white level pixels under the influence of laser radiation with specific wavelengths and also products produced with use of methods of this type, in particular such as secured documents, for example personalized pages for passports, identity cards and other identification cards, etc..
  • identity cards may need to be produced for very large population pools, yet every individual card has to uniquely identify the person carrying the card.
  • the high-volume manufacturing phase may be performed on relatively expensive equipment because the equipment cost may be amortized over very large production runs.
  • the end-user personalization may be preferably carried out at customer locations in relatively low volumes, thus, requiring much lower equipment costs.
  • One very important mechanism for tying an individual to an identity object is the placement of a person's photograph on the identity object.
  • Driver's licenses, passports, identity cards, employee badges, etc. all usually bear the image of the individual to whom the object is connected.
  • a known technique for personalizing an identity card post-issuance with a photograph is to define on a selected part of a physical medium, such as for example a plastic substrate, a matrix of pixels made up of subpixels in primary colors defining a color coding system.
  • a physical medium such as for example a plastic substrate
  • An example of color coding system is described in the document WO 2011/045180 .
  • a 'color coding system' is a set of N colors (possibly primary colors) that make it possible to define any visible color when they are combined with each other.
  • the system may be the so-called RGB (Red, Green, Blue) system or the so-called YMC (Yellow, Magenta, Cyan) system or the so-called YMCRGB (Yellow, Magenta, Cyan, Red, Green, Blue) system.
  • This type of matrix constitutes a diagram or a chart that is designed to contribute to the definition of an image in color, for example a face.
  • a transparent light-sensitive layer is deposited over it.
  • a laser beam carbonizes the surfaces of subpixels, creating non-reflective, black surfaces that form the gray levels of the personalized image.
  • This known technique thus enables a latent image to be personalized, which latent image is constituted by subpixels. That personalized image is obtained by interaction between the subpixels and non-reflective black surfaces produced by the laser carbonization that serves to form the gray levels of the final personalized image.
  • the image as personalized in this way is observed by reflection through the transparent protection layer.
  • the personalized image must be sufficiently reflective to enable it to be observed in ambient light without having recourse to an additional light source.
  • one of the drawbacks of that method lies in the color of the background of the personalized image. Indeed, it is known that when small adjacent surfaces are printed, herein "subpixels", and if these surfaces are sufficiently small, the eye can integrate the light beams derived from these three (or more) subpixels and sees a color which is the composition of the light beams produced by the reflection of white light on these three subpixels. This composition is said to be additive since there is no mixing of colors but mere mixing of colored light beams derived from the three subpixels. The same composition is obtained with any primary color of subpixels, in particular the RGB colors or YMC colors whose color space is included it that of the RGB triplet.
  • the additive composition of subpixels printed with independent colors is perceived by the eye as an undesired background colouring of the security document being more or less close to white.
  • Using subpixels and the gray levels produced by laser carbonization to form the personalized image lead to reduce the color gamut as it is not possible to reach a full white gradient.
  • a known solution is to add a white pigment (or other reactive product) to the composition for manufacturing the laser markable layer.
  • the aim of adding this white pigment (or other product) is to strongly illuminate the colors of the subpixels.
  • the white subpixel (W) added to the three RGB or YMC subpixels is to reinforce both the luminosity of the image and its white component. It is generally proposed that the four subpixels RGBW or YMCW form a square.
  • the known solution are advantageous in some respects, those structure of subpixels present some disadvantages. Indeed, the subpixel printing technology is not able to prevent overlapping of the RGBW or YMCW colors which may generate a grey color background detrimental to the quality of the image because of the fact that adding white sub-pixels space between color line reduce color contrast.
  • FIG. 1 illustrates the final personalization image resulting from a carbonization of the surfaces of subpixels wherein the primary color of each subpixel is set on the color coding scheme YMCW. As illustrated by FIG. 1 , the background is not pure white.
  • the present invention addresses the aforementioned drawbacks of the prior art by improving the quality of the white color of the background of the final personalized image.
  • the invention provides in a first step a forming phase of a personalized color laser images from an assembly comprising a transparent protection layer over a printed latent image constituted by color subpixels printed by offset or inkjet, or any technique known to persons skilled in the art, and a laser beam that passes through the protection layer, through or over the subpixels of the latent image, and forms the gray levels of a final personalized image in the laser markable layer, the assembly being laminated on a medium.
  • the term laser markable layer material shall designate any material which darkens under the effect of a laser beam using adapted wavelength.
  • the gray levels that lead to the latent image being personalized in order to form the final image are calculated with the help of a software that takes an original image, segments it into subpixels, calculates the corresponding color shades, and determines the gray levels that are to be carbonized for the color subpixels of the latent image in order to obtain the relative color shades as those in the original image.
  • the gray levels of the personalized image are obtained by a degree of blackening that is made proportional to the energy deposited by the laser by means of linearizing software, known to the person skilled in the art, and also by varying the areas of the carbonization.
  • the laser markable layer materials that form the gray levels of the personalized image by being carbonized under the effect of a laser beam may be constituted by polycarbonates, certain treated polyvinyl chlorides, treated acrylonitrile-butadiene-styrenes, or treated polyethylene terephthalates.
  • the present invention provides also in a second step a whitening phase of a background of the personalized image.
  • the subpixels that lead to the background of the personalized image are calculated with the help of a software that takes an original image, segments it into subpixels, selects the subpixels forming the lightest colors representing the image background, and determines the whitening levels to be used for selected color subpixels of the latent image in order to obtain a full white or a light color.
  • the selected subpixels are whitened by laser treatment using a single irradiation frequency. This process eliminates the subpixels ability to absorb light, resulting in a white mark.
  • the whitening effect is implemented by virtue of the pigments altering their color by color change when the laser treatment is carried out.
  • the whitening phase is made through a bleaching process wherein the laser beam penetrates into the selected background subpixels and is absorbed by color pigments.
  • the pigments of the subpixel are bleached independently of their color. Under irradiation with intensive laser radiation, the pigment of these subpixels lose their absorption property, at least partially. In this way, they may be bleached, at least partially. When the pigments change chemically, this causes the color of the material to change.
  • the color subpixel is covered with a transparent layer wherein during the whitening process, the laser beam forms over alterable selected locations of said transparent layer substantially white opaque hiding more or less the subpixels and forming the image light color representing the background of the final personalized image.
  • each light color sub-pixel is determined and then the latter is whitened by means of a laser beam with a single wavelength, preferably with a high-energy wavelength in the blue or ultraviolet spectrum.
  • the present invention also relates to a data carrier having a character, pattern, symbol and/or image produced according to a method as described above.
  • data carriers are preferably an identification card, credit card, passport, user credentials or a name badge.
  • the invention proposes a method for producing a final personalized image in an image area on a physical media, comprising the following steps:
  • the formation of the gray levels and the production of the white levels are carried out at the same time or sequentially in any order.
  • the method of the present invention comprises the following steps:
  • the method of the present invention comprises the following steps:
  • the method of the present invention comprises the following steps:
  • the second laser with a single frequency is a high energy wavelength in the blue or ultraviolet spectrum.
  • the first laser and the second laser are the same laser.
  • each subpixels of the print-pixel corresponds to a unique color of a primary color.
  • the print-pixel pattern is printed on a surface of a laser markable layer.
  • Said laser markable layer is laminated on the physical medium.
  • the final personalized image is letters, numbers, pictures, digital photographs, designs or machine readable information.
  • the present invention is also related to an identity card having a multi-colored final personalized image on a substrate having printed print-pixel pattern which are arranged thereon, wherein said multi-colored final personalized image and a white background of said personalized image are produced according to the method of said present invention described herein.
  • the identity card is an identification card, credit card, passport, user credentials or a name badge.
  • an action when an action is said to be performed by a device, it is in fact executed by a microprocessor in this device controlled by instruction codes recorded in a program memory on said device.
  • An action is also ascribed to an application or software. This means that part of the instruction codes making up the application or software are executed by the microprocessor.
  • An embodiment of the invention provides a mechanism by which physical media such as identification cards, bank cards, smart cards, passports, value papers, etc. may be personalized in a post-manufacturing environment.
  • This technology may be used to place images onto such articles inside a lamination layer after the lamination layer has been applied.
  • identity card refers to the entire class of physical media to which the herein-described techniques may be applied even if some such physical media are not "cards" in a strict sense.
  • identity card it is intended to include all such alternatives including but not limited to smart cards (both contact and contactless smart cards), driver's licenses, passports, government issued identity cards, bankcards, employee identification cards, security documents, personal value papers such as registrations, proofs of ownership, etc.
  • FIG. 2 is a top-view of an identity card 10 according to one embodiment of the technology described herein.
  • the identity card 10 may be formed of PVC (polyvinyl chloride) or PC (poly carbonate) material or any other suitable material on which information can be printed.
  • the identity card 10 is provided with an image area 11 that is constructed from several layers of material located between a substrate (e.g., a PC core) and a lamination layer.
  • the bottom layer of these image-area layers is a print-pixel grid see Figure 4 which comprises a plurality of specifically arranged areas having distinct colors.
  • the print-pixel grid is covered by a transparent layer as illustrated in FIG.3 .
  • the structure of the print-pixel grid and the process of manipulating these layers to produce an image and a white background are discussed in greater detail herein below.
  • FIG. 3 is a cross-section view of an embodiment for the identity card 10.
  • a laser markable layer 14 is created on a body 13 of the identity card 10.
  • the laser markable layer 14 may be polycarbonates, certain treated polyvinyl chlorides (PVCs), treated acrylonitrile-butadeiene-styrenes (ABSs), and treated polyethylene terephthalates (PETs) or it may be any other suitable plastic material which includes a chemical which can react with a laser to produce desirable markings.
  • PVCs polyvinyl chlorides
  • ABSs treated acrylonitrile-butadeiene-styrenes
  • PETs polyethylene terephthalates
  • the laser markable layer 14 may be situated over the print pixel grid 15 or under it.
  • the print pixel grid 15 are printed by offset printing, by ink-jet printing, or by any other technique.
  • the laser markable layer 14 could be separated from the pixel grid by another transparent layer according to the laser wavelength.
  • a transparent layer may be situated between the laser markable layer 14 and the print pixel grid 15.
  • the print pixel grid 15 is covered at least with a lamination layer 12.
  • the lamination layer 12 provides security in that it protects a personalized image 16 produced in the image area 11 from physical manipulation.
  • the personalized image 16 can be letters, numbers, symbols, pictures, digital photographs, designs or machine readable information.
  • the lamination layer 12 is transparent to the laser beam used to produce a black surface by carbonization process forming the grey level of the final personalized image 16 in the laser markable layer 14.
  • the lamination layer 12 may be transparent or not to the laser beam used to produce light color surface by whitening process forming the background 17 of the final personalized image 16 in the laser markable layer 14.
  • the assembly comprising the lamination protective layer, the print pixel grid 15, and the laser markable layer 14 is bonded under pressure on the document medium of the identity card 10.
  • This bonding operation is known as "lamination” by the person skilled in the art.
  • the lamination layer 12, the laser markable layer 14, and the print pixel grid 15 are laminated on the body 13 of the identity card 13.
  • a transparent to white opaque layer may be arranged over the print pixel grid 15 at least in the area of the laser markable layer 14 forming the background 17 of the final personalized image 16.
  • the transparent to opaque layer may be selectively altered to some level of white opaque.
  • the transparent to white opaque layer is translucent or transparent allowing the viewing of the print pixel grid 15 and hides the print pixel grid 15 to a white opaque after the whitening process.
  • the transparent to white opaque layer is covered by the lamination layer 12.
  • FIG. 4 illustrates an embodiment of a structure of the print-pixel grid 15.
  • the print-pixel grid 15 is composed of an array of print-pixels 18.
  • a print-pixel 18 corresponds to one pixel or a set of pixels in an image file.
  • a grid having many more print-pixels in each dimension would be necessary for producing a meaningful image.
  • Each print-pixel 18 may comprise at least triplets of color subpixels.
  • the colors of the subpixels are preferably selected from colors that are independent, i.e. mixing any two of them cannot lead to a third subpixel color being formed.
  • each subpixels of the print-pixel 18 corresponds to a unique color of a primary color of red, green and blue (RGB). In another embodiment, each subpixels of the print-pixel 18 corresponds to a unique color of a primary color of cyan, magenta and yellow (CMY). In another embodiment, each subpixels of the print-pixel 18 corresponds to a unique color of a primary color of red, green, blue and white (RGBW) or cyan, magenta, yellow and white (CMYW). In another embodiment, each print-pixel 18 can comprise subpixels each corresponding to a unique color, e.g., cyan, magenta, yellow and black (CMYK).
  • RGBW red, green, blue and white
  • CMYW cyan, magenta, yellow and white
  • each print-pixel 18 can comprise subpixels each corresponding to a unique color, e.g., cyan, magenta, yellow and black (CMYK).
  • each print-pixel 18 can comprise subpixels each corresponding to a unique color, e.g., cyan, magenta, yellow, black, red, green, blue and white (CMYKRGBW).
  • CMYKRGBW red, green, blue and white
  • each print-pixel comprises 3 subpixels 19, 20 and 21 each corresponding to a unique color, e.g., green, blue, and red (GBR).
  • a unique color e.g., green, blue, and red (GBR).
  • each subpixel 18, 19 and 20 is subdivided into a plurality of sub-subpixels 22, in the aim to reproduce close similar effects as the selected set of pixel of the original image.
  • print-pixel is used herein to the equivalent of a pixel or a set of pixel in a digital image that is printed in the print-pixel grid and having a plurality of subpixels that each form a portion of the print-pixel that cover the image area 11.
  • a subpixel is a single-color area of the print-pixel.
  • a sub-subpixel is a single addressable location in a subpixel.
  • a subpixel is composed of one or more sub-subpixels.
  • the print-pixel grid 15 comprises print-pixels 18 which are composed of rectangular subpixels 19, 20 and 21.
  • the print-pixel grid 15 comprises print-pixels 18 which are composed of hexagonal subpixels 19, 20 and 21.
  • the print-pixel grid 15 comprises print-pixels 18 which are composed of circles subpixels 19, 20 and 21.
  • the print pixel grid 15 can comprise color subpixels and non-colored subpixels. Non-colored subpixels serve to increase the reflectivity of the final personalized image 16.
  • the color subpixels and the non-colored subpixels are organized in parallel columns or in small areas that are uniformly distributed.
  • the print pixel grid 15 is printed on the laser markable layer 14. Alternatively, it may be printed on the lamination layer 12.
  • the lamination layer 12 is laminated onto the assembly. In an embodiment, the print pixel grid is printed by color on different layers which are assembly with good registration before lamination process.
  • a controlling device of the personalization system takes an original image, segments it into subpixels. From this segmentation, it is determined the subpixels forming a latent image and the subpixels forming the background. For each subpixel forming the latent image the controlling device calculates the corresponding color shades, and determines the gray levels that are to be carbonized in the laser markable layer under said subpixel of the latent image in order to obtain the relative color shades as those in the original image.
  • the controlling device calculates the white levels that are to be bleached in the laser markable layer under said subpixel in order to obtain light color background.
  • the controlling device calculates the white levels that are to be bleached in the laser markable layer under said subpixel in order to obtain the expected light color. If in another embodiment, the print pixel grid is covered by the transparent to white opaque layer, the controlling device calculates the white opaque levels of the transparent to white opaque layer to be reached during the whitening process.
  • the laser beam is producing the grey levels by carbonizing the transparent laminate layer sheet to form the personalized image 16.
  • the laser beam carbonizes a certain thickness of the sheet of the laser markable layer 14 with varying intensities or areas over each subpixel so as to form non-reflective, black volumes that cause gray levels to appear in the final personalized image 16.
  • the degree of blackening is made proportional to the energy delivered by the laser, with the help of linearizing software known to the person skilled in the art.
  • the energy delivered by the laser is then adjusted so as to produce all of the shades of gray required to form an attractive color laser image. The result of this carbonization process enables a latent image to be personalized, which latent image is constituted by subpixels.
  • a whitening process by bleaching method may be applied to the print pixel grid 15.
  • This bleaching process is a lightening process wherein each subpixel is bleached by means of a laser beam with a single wavelength, preferably with a high-energy wavelength in the blue or ultraviolet spectrum.
  • a processing protocol for the laser receives the information on which subpixel pigment are to be locally influenced in their color effect by the laser in a targeted manner, in particular destroyed in their color effect (bleached or hided) by the laser, as a function of the location coordinates to produce a certain macroscopic white or light color background effect for the personalized image 16 produced by grey level.
  • one subpixel lie in the beam cone or focal area of the laser within a certain period for the bleaching process, all other color components being situated in the shadow of the laser light during the same period.
  • a whitening process by hiding the print pixel grid with a light or a white opaque may be applied to the transparent to white opaque layer.
  • the processing protocol for the laser receives the information on the subpixels forming the background.
  • the transparent to opaque layer is selectively altered to some level of white opaque by a laser wavelength in the blue or ultraviolet spectrum.
  • the transparent to white opaque layer hides the print pixel grid 15 to a white opaque after the whitening process.
  • all 3 types of pigment of the subpixel are whitened at only one wavelength in the UV to Blue range (in an example 355 nm but not limited to).
  • the second step and the third step of the personalization phase can be carried out at the same time or sequentially.
  • the sequentially order of carrying out the second step and the third step of the personalization phase is defined according to the implementation of the personalization process.
  • the whitening phase and the carbonization phase are processed by one unique laser with different wavelength.
  • FIG. 5 illustrates the final personalization image resulting from a carbonization of the surfaces of subpixels wherein the primary color of each subpixel is set on the color coding scheme RGBW and a whitening process of the background subpixels with a laser wavelength in the blue laser spectrum.
  • one laser is used for forming the latent image and another laser is used for the whitening process of the different pigments of the print pixel grid 15.
  • Using only one wavelength for the whitening process thus achieves a considerable reduction in the cost of the technical system instead of having at least 3 wavelengths for bleaching 3 primary colors.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
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  • Manufacturing & Machinery (AREA)
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EP17305284.6A 2017-03-16 2017-03-16 Procédé d'optimisation d'une image laser couleur et document sur lequel une image laser couleur est ainsi produite Withdrawn EP3375622A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP17305284.6A EP3375622A1 (fr) 2017-03-16 2017-03-16 Procédé d'optimisation d'une image laser couleur et document sur lequel une image laser couleur est ainsi produite
EP18707394.5A EP3595907A1 (fr) 2017-03-16 2018-03-05 Procédé d'optimisation d'image laser couleur et document sur lequel une image laser couleur est produite de cette façon
PCT/EP2018/055358 WO2018166832A1 (fr) 2017-03-16 2018-03-05 Procédé d'optimisation d'image laser couleur et document sur lequel une image laser couleur est produite de cette façon

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EP17305284.6A EP3375622A1 (fr) 2017-03-16 2017-03-16 Procédé d'optimisation d'une image laser couleur et document sur lequel une image laser couleur est ainsi produite

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EP18707394.5A Pending EP3595907A1 (fr) 2017-03-16 2018-03-05 Procédé d'optimisation d'image laser couleur et document sur lequel une image laser couleur est produite de cette façon

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1043549B1 (en) * 2020-01-17 2021-09-08 Rene Ten Velden Ronald Method for generating an embedded colour image within a synthetic (polymer) data carrying document using laser
EP4177067A1 (fr) * 2021-11-09 2023-05-10 IDEMIA France Procédé de contrôle d'un laminé, dispositif de contrôle, et laminé comportant un élément de contrôle correspondant
CN117533042B (zh) * 2023-11-09 2024-05-31 深圳市微露智能科技有限公司 一种变量打印防伪证卡的制作方法

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