EP2147799A1 - Sicherung eines gedruckten Bilds mit HIlfe eines Laserstrahls - Google Patents

Sicherung eines gedruckten Bilds mit HIlfe eines Laserstrahls Download PDF

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Publication number
EP2147799A1
EP2147799A1 EP08305411A EP08305411A EP2147799A1 EP 2147799 A1 EP2147799 A1 EP 2147799A1 EP 08305411 A EP08305411 A EP 08305411A EP 08305411 A EP08305411 A EP 08305411A EP 2147799 A1 EP2147799 A1 EP 2147799A1
Authority
EP
European Patent Office
Prior art keywords
lens
laser beam
pixels
shape
image
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Withdrawn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
EP08305411A
Other languages
English (en)
French (fr)
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.)
Gemplus SA
Original Assignee
Gemplus 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 Gemplus SA filed Critical Gemplus SA
Priority to EP08305411A priority Critical patent/EP2147799A1/de
Priority to EP09800040.9A priority patent/EP2303589B1/de
Priority to PCT/EP2009/059323 priority patent/WO2010010073A1/fr
Publication of EP2147799A1 publication Critical patent/EP2147799A1/de
Withdrawn legal-status Critical Current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
    • 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
    • B41J2/465—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 masks, e.g. light-switching masks
    • 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

Definitions

  • the present invention relates to securing a printed image by means of a laser beam.
  • the invention lies in the field of identification documents chip or without chip, such as driving licenses, identity cards, membership cards, access badges, passports, bank cards, electronic purses, multi-application cards and other valuable papers. Because of the value and importance associated with each of these documents, they are often subject to unauthorized copies, alterations, modifications, and counterfeits.
  • the invention aims more particularly at securing personalization information registered on any type of medium, so as to avoid any subsequent fraudulent modification of this information.
  • a customizable support for example an identity card, comprising a body 2 provided, on a top face 3, personalization information 4, 6, 7 official relating to the card holder.
  • This personalization information is reported via a graphical personalization means, for example YAG laser type.
  • the card 1 comprises a card body 2, made of an opaque plastic material, for example of the polycarbonate, PET and / or ABS or PVC type.
  • a transparent protective layer 5, also called “overlay" in the jargon of the cards, is advantageously fixed on at least one face of the card body.
  • the card body 2 is designed to be provided on its upper face 3 with personalization information 4.
  • the personalization information 4 shown on the card body 2 comprises, with reference to the figure 2 , the photographic representation 6 of the holder of the card and alphanumeric characters 7 relating to the identity of the holder.
  • the personalization data 7 and the photograph 6 are, for example, written on the surface 3 of the card body by means of a laser beam, by burning the surface of the card body.
  • the local discoloration of the resulting surface depends on the available energy, the inscription time as well as the material of the card body used.
  • the customization may be made directly in the transparent protective layer 5.
  • the material used for the transparent protective layer 5 is a material doped with carbon particles which blacken under the action of a laser beam.
  • micro perforations there are other techniques of creating security elements by making micro perforations in the body of the support, said micro-perforations reproducing the personalization information, such as the photograph of the holder of the medium for example, so as to authenticate the photo of the owner.
  • a laser technology is used to create the micro-perforations through the thickness of the support body, the perforations being arranged to form an image that becomes clearly visible to the naked eye when the document is illuminated, thus allowing easy verification.
  • This technology requires an additional step of reproducing identically, and therefore very accurately, personalization information by laser perforation. Such a solution is therefore long and complex to implement, and therefore relatively expensive.
  • patent application EP1 747 897 describes a method for securing an image by converting the data of the image to be secured into character data. The characters are then printed, respecting the dark and light areas and maintaining the shape of the image, by means of a laser, on the surface of the medium to be printed. This solution requires means of image processing and complicated calculations and consumers of time, and therefore expensive.
  • the technical problem of the present invention consists in proposing a simple and inexpensive alternative to existing solutions, to effectively secure a printed image by means of a laser beam, which would make it possible to overcome the use of complex calculations, expensive, and time consuming.
  • the security method comprises a step consisting in arranging a lens on the path of the laser beam, upstream or downstream of a focusing device, in such a way that altering the shape of the laser beam and imparting the resulting printed pixels with a specific shape.
  • the printed pixels are no longer of conventional round or oval shape, but they have a specific shape, related to the structure of the lens used to deform the laser beam. It is therefore impossible to reproduce the shape of the pixels without having the corresponding specific lens. Therefore, any addition or modification of an image printed and secured in this way is very easy and quick to detect, by means of a simple magnifying glass for example. Indeed, in this case all the added pixels have a shape different from the original pixels.
  • the invention also relates to the use of a lens for securing a printed image by means of a laser beam, said lens being placed upstream or downstream of a beam focusing device, so as to deform the beam and imparting the resulting printed pixels with a particular shape.
  • the figure 3 illustrates a customizable support 1 ', provided on one side with information printed in a secure manner.
  • the medium is represented in card format, but it is not limited to this format and can be in any other form.
  • the invention applies to any printable medium by means of a laser beam, it can therefore be a card-size medium, as well as a passport-type booklet medium or any other single-sheet type medium. paper, cardboard, plastic etc.
  • the support 1 'of the figure 3 includes the photographic representation 6 'of the card holder, and alphanumeric characters 7' relating to the identity of the holder. All these data relating to the identity of the holder of the support are printed, in a conventional manner, by means of a laser beam.
  • the photographic representation 6 'shown is simply a detail (in this case the eye) enlarged photo holder. A detail of this even larger eye is represented on the figure 4 .
  • This detail makes it possible to visualize the particular shape of the printed pixels. Conventionally, when an image is printed by means of a laser beam, the pixels of the image are round or oval in shape.
  • the shape-specific pixels 61-64 as illustrated on the figure 4 are achieved by using a specific diffractive lens in the path of the laser beam, the structure of which makes it possible to modify the shape of the laser beam and to give a specific shape to the resulting printed pixels. Modifying the shape of the printed pixels makes it possible to secure the image, since any attempt to fraudulently modify the image is immediately visible. Indeed, without the use of the specific lens, it is impossible to create pixels of the same shape.
  • pixels 61-64 are in the form of a square, each corner is truncated, and comprising a notch on one side.
  • this form is only an illustrative example.
  • Pixels can take any shape more or less complex and difficult to reproduce easily. Thus, they may be in the form of a logo, a drawing of any shape, or a sequence of alphanumeric characters, or a map of a country, with an anomaly to further increase the with denser areas or points representing cities or rivers for example etc ...
  • the shape of the pixels depends in fact on the structure of the lens used to deform the laser beam.
  • the figure 5 illustrates, very schematically, the device used to print a secure image according to the invention.
  • a laser cavity 51 is used to create a laser beam 52, of cylindrical shape 60.
  • a diffractive lens 55 of specific structure. This lens makes it possible to modify the shape of the laser beam 52 which, after focusing 57, makes it possible to print pixels of specific shape 61 on a printable medium 10.
  • the lens 55 may be arranged upstream or downstream of the focusing device 56. In a preferred embodiment, it is placed upstream of the focusing device because the lens has a natural tendency to cause diffraction of the laser beam, that it is necessary to concentrate then to be able to obtain a pixel.
  • the laser system used has a short focal length and emits in a range of short wavelengths.
  • This may for example be an excimer laser, emitting in the ultraviolet, typically between 200 and 400 nm, for example around 355 nm.
  • This type of laser makes it possible to print an image of better quality, with less interference, than a type YAG laser, monomode for example.
  • the use of a Yag laser does not preclude also being able to obtain good results with a longer wavelength.
  • the lens in rotation, in the context of a positioning of the latter upstream of the focusing device, during of laser printing.
  • This rotation drive can be achieved by means of a slave motor for example, and controlled by the same control unit for controlling the printing.
  • Rotating the lens makes it possible to print pixels of the same shape but oriented differently relative to each other. The result of such an impression is clearly visible on the figure 4 . Indeed, in this figure, the pixels are rotated at different angles. In the example of the figure 4 , there are thus four different positions 61-64 pixels. Of course this is just a simple example where the pixels are rotated at an angle of 90 ° to each other. This example is in no way limiting and the pixels can be rotated relative to each other by an angle between 0 and 360 °. These angles depend essentially on the speed of rotation of the lens.
  • the rotational speed of the lens is thus predefined so that the pixels are printed with a predefined angle.
  • the code thus introduced into the image can then be decrypted by means of a reading device comprising suitable image processing means.
  • the quality of the image obtained will be somewhat reduced, because of the diffraction of the beam on a part of the lens and the need to focus the beam.
  • customization element on the support The size, shape and orientation of each pixel being defined by the part of the lens used in the area of the customization defined, it is then difficult to rotate the latter to generate a variable code.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Credit Cards Or The Like (AREA)
EP08305411A 2008-07-21 2008-07-21 Sicherung eines gedruckten Bilds mit HIlfe eines Laserstrahls Withdrawn EP2147799A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08305411A EP2147799A1 (de) 2008-07-21 2008-07-21 Sicherung eines gedruckten Bilds mit HIlfe eines Laserstrahls
EP09800040.9A EP2303589B1 (de) 2008-07-21 2009-07-20 Sicherung eines gedruckten bilds mit hilfe eines laserstrahls
PCT/EP2009/059323 WO2010010073A1 (fr) 2008-07-21 2009-07-20 Securisation d'une image imprimee au moyen d'un faisceau laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08305411A EP2147799A1 (de) 2008-07-21 2008-07-21 Sicherung eines gedruckten Bilds mit HIlfe eines Laserstrahls

Publications (1)

Publication Number Publication Date
EP2147799A1 true EP2147799A1 (de) 2010-01-27

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP08305411A Withdrawn EP2147799A1 (de) 2008-07-21 2008-07-21 Sicherung eines gedruckten Bilds mit HIlfe eines Laserstrahls
EP09800040.9A Active EP2303589B1 (de) 2008-07-21 2009-07-20 Sicherung eines gedruckten bilds mit hilfe eines laserstrahls

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP09800040.9A Active EP2303589B1 (de) 2008-07-21 2009-07-20 Sicherung eines gedruckten bilds mit hilfe eines laserstrahls

Country Status (2)

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EP (2) EP2147799A1 (de)
WO (1) WO2010010073A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015208297A1 (de) * 2015-05-05 2016-11-10 Bundesdruckerei Gmbh Personalisierungsvorrichtung und Verfahren zur Personalisierung eines Dokuments

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63303746A (ja) * 1987-06-03 1988-12-12 Nikon Corp 光マ−キング装置
US5767483A (en) * 1993-08-19 1998-06-16 United Distillers Plc Method of laser marking a body of material having a thermal conductivity approximately equal to that of glass
US20030063390A1 (en) * 2001-08-03 2003-04-03 Daniel Brown Multi-aperture beam integrator/method producing a continuously variable complex image
EP1319520A2 (de) * 2001-12-14 2003-06-18 Xerox Corporation Verfahren und Vorrichtung zum Einbetten von verschlüsselten Unterschriftsbildern und anderen Daten auf Schecks
US20040263986A1 (en) * 2002-09-30 2004-12-30 Brown Daniel M. Method and device for combining and shaping beams
EP1747897A1 (de) 2005-07-28 2007-01-31 Mühlbauer AG Personalisierungsverfahren zur Erzeugung eines Bildes auf einem Kunststoffsubstrat und personalisiertes Sicherheitsdokument
EP1876028A1 (de) * 2006-07-07 2008-01-09 Setec Oy Verfahren zur Herstellung eines Datenträgers sowie nach diesem Verfahren hergestellter Datenträger

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63303746A (ja) * 1987-06-03 1988-12-12 Nikon Corp 光マ−キング装置
US5767483A (en) * 1993-08-19 1998-06-16 United Distillers Plc Method of laser marking a body of material having a thermal conductivity approximately equal to that of glass
US20030063390A1 (en) * 2001-08-03 2003-04-03 Daniel Brown Multi-aperture beam integrator/method producing a continuously variable complex image
EP1319520A2 (de) * 2001-12-14 2003-06-18 Xerox Corporation Verfahren und Vorrichtung zum Einbetten von verschlüsselten Unterschriftsbildern und anderen Daten auf Schecks
US20040263986A1 (en) * 2002-09-30 2004-12-30 Brown Daniel M. Method and device for combining and shaping beams
EP1747897A1 (de) 2005-07-28 2007-01-31 Mühlbauer AG Personalisierungsverfahren zur Erzeugung eines Bildes auf einem Kunststoffsubstrat und personalisiertes Sicherheitsdokument
EP1876028A1 (de) * 2006-07-07 2008-01-09 Setec Oy Verfahren zur Herstellung eines Datenträgers sowie nach diesem Verfahren hergestellter Datenträger

Also Published As

Publication number Publication date
WO2010010073A1 (fr) 2010-01-28
EP2303589A1 (de) 2011-04-06
EP2303589B1 (de) 2014-07-02

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