WO2000064682A1 - Dispositif de securite implante par laser - Google Patents

Dispositif de securite implante par laser Download PDF

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Publication number
WO2000064682A1
WO2000064682A1 PCT/AU2000/000373 AU0000373W WO0064682A1 WO 2000064682 A1 WO2000064682 A1 WO 2000064682A1 AU 0000373 W AU0000373 W AU 0000373W WO 0064682 A1 WO0064682 A1 WO 0064682A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
dopant molecules
polymer film
target
laser
Prior art date
Application number
PCT/AU2000/000373
Other languages
English (en)
Inventor
Paul Zientek
Gerard Joseph Wilson
Original Assignee
Securency Pty Ltd
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 Securency Pty Ltd filed Critical Securency Pty Ltd
Priority to CA002406178A priority Critical patent/CA2406178A1/fr
Priority to AU39500/00A priority patent/AU3950000A/en
Priority to EP00918610A priority patent/EP1278639A1/fr
Publication of WO2000064682A1 publication Critical patent/WO2000064682A1/fr

Links

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
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • 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
    • 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
    • B42D25/29—Securities; Bank notes
    • 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
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects

Definitions

  • the present invention relates to a method of incorporating a security device into a security document, and in particular to such a method where the security document includes a polymer film.
  • the present invention is suitable for use in polymer based banknotes and it will be convenient to describe the invention in relation to this application. It should be appreciated, however, that the invention is not restricted to use in this application only.
  • Security documents such as banknotes, credit cards, bank cards, cash cards, cheques and the like are used in a wide variety of financial transactions. These security documents generally include printed information identifying the security document, such as the denomination of a banknote, as well as various markings, patterns or other optically or electromagnetically variable devices. It is important that these features be incorporated into the security document in such a way as to render the security document difficult to counterfeit. Visible patterns and designs are often printed in ink on the surface of a banknote, whilst other security devices, such as optically or magnetically variable devices, may be embossed or stamped into the substrate of the banknote. Whilst many of these security features have proved adequate in preventing the unauthorised reproduction of banknotes and other security documents, the increasing sophistication of would be counterfeiters results in an ongoing need to further develop techniques for including security devices in banknotes.
  • the present invention provides a method for embedding a security device into a security document, the security document including a target polymer film, the method including laser irradiating a polymer carrier film doped with dopant molecules according to a predefined security pattern with an intensity sufficient to eject the dopant molecules and implant said dopant moleculesinto the target polymer film but below that which causes ablation of a polymer carrier film.
  • the surface of the target film may be rendered more receptive to the implanting of the dopant molecules by firstly softening the surface of the target film.
  • the dopant molecules may be visible colouring agents, such as dyes, inks or pigments.
  • the dopant molecules may be formed of materials exhibiting differing visual properties from the target polymer film, such as materials having a different refractive index, or materials which are fluorescent , pearlescent, irridiscent or otherwise visually different.
  • the dopant molecules may also exhibit different electromagnetic characteristics from that of the target polymer film, such as magnetic particles.
  • laser beams of different energy levels may be used to implant dopant molecules at a plurality of depths within the target polymer film.
  • the target polymer film may be positioned between a laser source and the polymer carrier film, the dopant molecules being ejected into the target polymer film back towards the laser source.
  • the target polymer film may be at least partially transparent.
  • the polymer carrier film may be positioned between the laser source and the target polymer film, the dopant molecules being ejected from the carrier film away from the laser source. In this instance the target polymer film may be at least partially opaque.
  • a focusing lens may be used to focus the laser beam onto the polymer carrier film.
  • a mask may also be placed in the path of the laser beam according to the desired predefined security pattern which is to be ejected from the polymer carrier film.
  • two or more laser sources may be used simultaneously on the polymer carrier film, the two or more resultant laser beams interacting to produce an interference pattern. Accordingly, an interference pattern may be established resulting in the transfer of a periodic structure from the polymer carrier film into the target polymer film.
  • the security document may be a banknote whilst the polymer target layer may be a polymer film forming the basis of a substrate used in the production of the banknote.
  • Figures 1 and 2 show the use of a laser beam to transfer dopant molecules from a polymer carrier film into a target polymer film of a security document according to the present invention
  • Figures 3 and 4 show a second embodiment of the embedding method according to the present invention
  • Figures 5 and 6 show a third embodiment of the embedding method according to the present invention.
  • Figures 7 and 8 show a fourth embodiment of the embedding method according to the present invention.
  • the present invention is particularly, but not exclusively, applicable to banknotes or other security documents having at least a portion of the document formed from a plastics substrate having at least one opacifying layer of ink on one or both of its surfaces.
  • the plastics substrate is preferably formed of a polymeric material, such as PE, PP or PET which may be made up of at least one biaxially oriented polymer film.
  • the substrate may comprise a single layer film of polymeric material.
  • the substrate may comprise a laminate of two or more layers of transparent biaxially oriented polymeric film.
  • the opacifying layers of printed matter may comprise one or more of a variety of opacifying inks which can be used in the printing of banknotes or other security documents.
  • the layers of opacifying ink may comprise pigmented coatings comprising a pigment, such as titanium dioxide, dispersed within a binder or carrier of cross-linkable polymeric material.
  • the present invention is based upon the discovery that a laser beam can be used to cause the transfer an ink, pigment, dye or other security device from a first polymer carrier film into the plastics substrate of a banknote or other security document in a controlled manner such that a high resolution embedded image results.
  • dye and other molecules can be ejected from a carrier film and implanted into a target film by use of an incident laser beam on the carrier film, without the energy of the laser beam causing fragmentation of the dye molecules. It has thus been found possible to embed a security device into a security document by irradiating a polymer carrier film, doped with dopant molecules, with a laser beam which impinges the surface of the carrier film in a predefined security pattern.
  • the intensity of the laser beam must be sufficient to cause the ejection of the dopant molecules into the target polymer film, but less than the intensity required to cause ablation of the polymeric carrier film itself. The exact value of these intensity levels will vary, depending upon the nature of the polymeric material used, the type of laser source and the dopant molecules borne by the polymeric carrier film.
  • FIG. 1 there is schematically shown a polymeric film 1 intended to be used as a substrate in a polymer film based banknote.
  • the polymer film 1 is preferably formed of a transparent polymeric material, in order to absorb as little as possible of the energy from the laser beam passing therethrough.
  • a polymer carrier film 2 is disposed laterally adjacent the target polymer film 1.
  • the polymer carrier film may be made from polymethacrylate (PMMA), polyethylmethacrylate (PEMA), polybutylmethacrylate (PBMA) or like polymeric material.
  • the carrier film 2 is doped with molecules 3 which are desired to be implanted into the polymer film 1 as a security device in the banknote. Any of a variety of dopant molecules may be used to dope the carrier film. Examples of such molecules are anthracene and pyrene, although a wide variety of other materials may be used.
  • a laser source 4 is used to generate a laser beam 5, which is focused by a lens 6 to a point at or under the facing surface 7 of the polymer carrier film 2.
  • the laser source 4 may be a XeF Excimer laser source.
  • the intensity of the laser beam 5 is controlled to be less than the threshold at which ablation of the polymeric material forming the carrier film 2 occurs. In such conditions, those dopant molecules within the polymer carrier film 2 which are impinged upon and absorb energy from the laser beam 5 are ejected, without the destruction of the chemical bonds holding the molecules together, from the polymer carrier film 2 towards and into the target polymer film 1. Since fragmentation of the dye molecules does not occur in this process, the dopant molecules now implanted into the target polymer film 1 form a pattern 8 corresponding to the pattern of the laser beam 5 striking the surface 7 of the polymer carrier film 2.
  • dopant molecules are therefore implanted into the polymeric substrate of a banknote or other security document and have a disposition corresponding to that pattern. Fine patterns and markings are able to be formed within the target substrate, and are not simply printed on the surface thereof as was previously possible.
  • the laser source 4, polymeric carrier film 2 and target polymer film 1 may be oriented so that the carrier film 2 is positioned between the laser source 4 and the polymer film 1.
  • the laser beam 5 is focused by the lens 6 onto or under (in this case) the far surface 7 of the carrier film 2, and dopant molecules ejected into the target polymer film 1 away from the laser source 4.
  • the polymer carrier film 2 may be printed or mounted on a transparent carrier film 8.
  • a mask 11 (see Figure 5) may be interposed between the laser beam 5 and the polymeric carrier film 2.
  • the opening 12 of the mask 1 1 may be shaped in any desired pattern, so that only those dopant molecules 13 upon which the patterned laser beam is incident, are ejected.
  • two or more laser sources 20, 21 may be used to produce corresponding laser beams 22 and 23, which are both directed to the same area of the carrier film 2.
  • the interference of the two laser beams 22 and 23 results in the intensity of the laser beam within the polymeric carrier film having a periodic variability. Accordingly, the depth at which the dopant molecules within the carrier film 2 will be excited and ejected therefrom will periodically vary. This results in the ejection and implantation into the target film 1 of a periodic three dimensional structure 24.
  • three dimensional security devices such as moyer gratings, etc., may be thus created and implanted within the banknote substrate. It is to be understood that various modifications and/or additions may be made to the method for embedding a security device into a security document without departing from the ambit of the present invention.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un procédé d'implantation d'un dispositif de sécurité dans un document de sécurité, lequel comporte un film polymère cible (1). Le procédé consiste à irradier au laser un film support polymère (2) dopé avec des molécules dopantes (3), selon un schéma de sécurité prédéfini, en appliquant une intensité suffisante pour introduire les molécules dopantes (13) dans le film polymère cible (1), mais inférieure à celle provoquant l'ablation d'un film support polymère (12).
PCT/AU2000/000373 1999-04-23 2000-04-28 Dispositif de securite implante par laser WO2000064682A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002406178A CA2406178A1 (fr) 1999-04-23 2000-04-28 Dispositif de securite implante par laser
AU39500/00A AU3950000A (en) 1999-04-23 2000-04-28 Laser implanted security device
EP00918610A EP1278639A1 (fr) 1999-04-23 2000-04-28 Dispositif de securite implante par laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPP9918A AUPP991899A0 (en) 1999-04-23 1999-04-23 Laser implanted security device

Publications (1)

Publication Number Publication Date
WO2000064682A1 true WO2000064682A1 (fr) 2000-11-02

Family

ID=3814117

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2000/000373 WO2000064682A1 (fr) 1999-04-23 2000-04-28 Dispositif de securite implante par laser

Country Status (5)

Country Link
EP (1) EP1278639A1 (fr)
AU (3) AUPP991899A0 (fr)
CA (1) CA2406178A1 (fr)
TW (1) TW509635B (fr)
WO (1) WO2000064682A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6822189B2 (en) 2001-10-16 2004-11-23 Data Storage Institute Method of laser marking and apparatus therefor
EP2230324A1 (fr) * 2006-04-17 2010-09-22 Imra America, Inc. Traitement de films dýoxyde de zinc à semi-conducteur de type P pour préparation correspondante, et procédé de dépôt de laser pulsé utilisant des substrats transparents
US9993982B2 (en) 2011-07-13 2018-06-12 Nuvotronics, Inc. Methods of fabricating electronic and mechanical structures

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804977A (en) * 1988-04-14 1989-02-14 Eastman Kodak Company Image or pattern transfer optical system for thermal dye transfer apparatus
WO1995030545A1 (fr) * 1994-05-05 1995-11-16 Imperial Chemical Industries Plc Rupture de la configuration en impression par transfert thermique
WO1996032662A2 (fr) * 1995-04-11 1996-10-17 Imperial Chemical Industries Plc Appareil destine au balayage d'un faisceau laser et procede correspondant
WO1997038864A1 (fr) * 1996-04-17 1997-10-23 Minnesota Mining And Manufacturing Company Element donneur de transfert de masse de polarisation et procede de transfert d'une couche de transfert de masse de polarisation
JPH10133394A (ja) * 1996-10-31 1998-05-22 Toppan Printing Co Ltd 画像形成方法とこの方法により得られた画像表示体
JPH10157315A (ja) * 1996-11-27 1998-06-16 Toppan Printing Co Ltd 熱転写シート

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804977A (en) * 1988-04-14 1989-02-14 Eastman Kodak Company Image or pattern transfer optical system for thermal dye transfer apparatus
WO1995030545A1 (fr) * 1994-05-05 1995-11-16 Imperial Chemical Industries Plc Rupture de la configuration en impression par transfert thermique
WO1996032662A2 (fr) * 1995-04-11 1996-10-17 Imperial Chemical Industries Plc Appareil destine au balayage d'un faisceau laser et procede correspondant
WO1997038864A1 (fr) * 1996-04-17 1997-10-23 Minnesota Mining And Manufacturing Company Element donneur de transfert de masse de polarisation et procede de transfert d'une couche de transfert de masse de polarisation
JPH10133394A (ja) * 1996-10-31 1998-05-22 Toppan Printing Co Ltd 画像形成方法とこの方法により得られた画像表示体
JPH10157315A (ja) * 1996-11-27 1998-06-16 Toppan Printing Co Ltd 熱転写シート

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class A89, AN 1998-351953, XP002958079 *
DATABASE WPI Derwent World Patents Index; Class A97, AN 1998-392651, XP002958080 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6822189B2 (en) 2001-10-16 2004-11-23 Data Storage Institute Method of laser marking and apparatus therefor
EP2230324A1 (fr) * 2006-04-17 2010-09-22 Imra America, Inc. Traitement de films dýoxyde de zinc à semi-conducteur de type P pour préparation correspondante, et procédé de dépôt de laser pulsé utilisant des substrats transparents
US9993982B2 (en) 2011-07-13 2018-06-12 Nuvotronics, Inc. Methods of fabricating electronic and mechanical structures

Also Published As

Publication number Publication date
TW509635B (en) 2002-11-11
AU3021500A (en) 2000-11-02
AUPP991899A0 (en) 1999-05-20
CA2406178A1 (fr) 2000-11-02
EP1278639A1 (fr) 2003-01-29
AU3950000A (en) 2000-11-10

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