EP1747905B1 - Dispositif de sécurité et méthode de fabrication - Google Patents

Dispositif de sécurité et méthode de fabrication Download PDF

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Publication number
EP1747905B1
EP1747905B1 EP06014552.1A EP06014552A EP1747905B1 EP 1747905 B1 EP1747905 B1 EP 1747905B1 EP 06014552 A EP06014552 A EP 06014552A EP 1747905 B1 EP1747905 B1 EP 1747905B1
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EP
European Patent Office
Prior art keywords
layer
mask
laser
substrate foil
security
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.)
Not-in-force
Application number
EP06014552.1A
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German (de)
English (en)
Other versions
EP1747905A2 (fr
EP1747905A3 (fr
Inventor
André Gregarek
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.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
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Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1747905A2 publication Critical patent/EP1747905A2/fr
Publication of EP1747905A3 publication Critical patent/EP1747905A3/fr
Application granted granted Critical
Publication of EP1747905B1 publication Critical patent/EP1747905B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads

Definitions

  • the invention relates to a security element for security papers, documents of value and the like having a carrier film with a cover layer, which in particular has visible in transmitted light coating-free areas in the form of patterns, characters or codes.
  • the invention further relates to a method for producing such security elements.
  • Security documents are often provided with security elements for the purpose of security, which allow verification of the authenticity of the value document and at the same time serve as protection against unauthorized reproduction.
  • Value documents within the meaning of the present invention are, in particular, bank notes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers which are subject to counterfeiting, such as passports and other identity documents, as well as product security elements such as labels, seals, packaging and the like.
  • value document in the following includes all such documents and product assurance means.
  • the security elements are often provided with a so-called negative writing.
  • This negative writing is formed for example by metal-free areas in an otherwise continuous metallic coating of the carrier material of the security element.
  • WO 99/13157 describes a washing method in which a translucent carrier sheet is printed with a desired pattern using a high pigment ink. Due to the high pigment content, the ink forms a porous, sublime color after drying. On the printed carrier film is then a thin Coating formed, which only partially covers the color body in the field of paint because of its large surface and the porous structure. The application of paint and the overlying covering layer can then be removed by washing with a suitable solvent, so that recesses are produced in the covering layer in the originally printed regions of the carrier film. By the achievable sharp contours can be introduced by printing a logo, for example, a legible negative writing in the cover layer.
  • the present invention seeks to propose a method for producing a generic security element, which avoids the disadvantages of the prior art.
  • the method should combine a fast production suitable for production conditions with high quality and high security against forgery of the generated security elements.
  • the carrier film is transparent for the predetermined laser wavelength and the mask is applied to the second main surface of the carrier film, that is to say on the main surface opposite the absorbent covering layer.
  • the mask can then be applied directly after a hologram embossing, so that an excellent registration to the hologram design can be achieved.
  • the process steps do not have to be carried out in the stated order. Rather, it may be advantageous if first the mask is applied to the second main surface of the carrier film, and only then the absorbent cover layer is applied to the first main surface of the carrier film.
  • the mask is printed on the first or second major surface of the carrier film.
  • the printing layer of the mask can be formed in both process variants by a thin ink layer, in particular a thin opaque white layer.
  • the mask is applied directly after a step of embossing a diffraction structure in the carrier film.
  • the mask is thereby positioned to the diffraction structure, so that the information formed by the openings of the mask in the register is an information formed by the diffraction structure.
  • the mask is applied as a negative mask whose areas transparent to the laser radiation of the defined wavelength define the shape of the desired coating-free areas.
  • the mask must not be completely impermeable in the non-transparent areas, it is sufficient if there is such a large part the laser radiation absorbs that the remaining residual radiation no longer has the intensity required to remove the cover layer.
  • the negative mask has openings in the form of the desired coating-free areas.
  • an opaque cover layer or a color layer can be applied as the absorbent cover layer. It is self-evident that not only a single layer but also a layer sequence with a plurality of superimposed layers can be applied as cover layer, such as the color shift effect thin-layer element mentioned below.
  • a metal layer or a layer sequence containing a metal layer is applied as cover layer, wherein the metal layer preferably consists of aluminum, copper, gold, iron, chromium, nickel, silver, platinum, palladium, titanium, another non-ferrous metal, or an alloy of these metals consists.
  • the cover layer forms the metallization layer of a diffractive diffraction structure. The metal layer is locally removed by the action of the laser radiation or converted into a transparent modification. Both cases are referred to in this description as ablation of the cover layer.
  • the method according to the invention is suitable not only for the local removal of thin cover layers (about 10 nm or more), but in particular also for the local removal of comparatively thick layers or layer sequences.
  • a layer sequence with a total thickness of more than 400 nm, in particular more than 800 nm, can be applied as cover layer.
  • a thin-film element with a color-shift effect is applied as the cover layer.
  • a thin-film element expediently has a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer.
  • Such a thin-film element can be applied with a layer thickness of up to about 1 .mu.m and according to the invention provided with coating-free regions.
  • thin-film elements having a plurality of successive dielectric layers with different refractive indices even several ⁇ m of layer thickness are possible.
  • These extremely thick layers can also be locally removed by the method according to the invention in order to produce desired patterns, characters or codes in the cover layer.
  • the mask may represent an auxiliary layer which is removed after the laser application.
  • the mask can also be formed by a layer which itself becomes part of the finished security element, and therefore does not have to be removed after laser application.
  • the mask may be formed in particular by a metal layer.
  • the mask is advantageously structured by a washing process or an etching process.
  • the security element contains a thin-film element with a color-shift effect, the absorber layer of the thin-film element assuming the role of the cover layer and the reflection layer of the thin-film element assuming the role of the mask.
  • the absorber layer is then removed by means of laser application through the reflection-layer mask.
  • a color layer is applied as the cover layer and a reflection layer is applied as the mask. Again, the top layer is removed after the structuring of the reflection layer by the mask thus formed.
  • a further advantageous embodiment is obtained when a color layer or a colored hologram embossing lacquer is used as the cover layer, and the metallization layer of a diffractive diffraction structure is used as the mask. In this way, attractive color effects can be produced in hologram films.
  • the loading of the carrier film with the laser radiation advantageously takes place over a large area in order to simultaneously detect a plurality of mask openings or transparent regions of the mask.
  • a laser spot is advantageously generated in the plane of the carrier film with a laser source and the carrier film is guided past the laser spot along a web running direction.
  • the laser spot is smaller than the relevant width of the carrier foil or a benefit of the carrier foil, so that the laser spot is moved over a deflection device at high speed along the width direction of the running carrier foil.
  • the laser spot is produced with such an extent in the plane of the carrier film that it covers substantially all the width of at least one benefit of the carrier film extending perpendicular to the web running direction without beam deflection. It is understood that the laser spot has peripheral areas in which the mask contains no openings, no longer needs to capture.
  • the carrier film advantageously passes the laser spot at a high web speed of about 50 m / min or more, preferably even about 100 m / min or more. If several benefits are arranged side by side on the carrier foil, a plurality of laser sources can be used, each of which detects one of the benefits.
  • Nd YAG lasers at 1.064 ⁇ m
  • frequency doubled Nd YAG lasers at 532 nm or diode lasers in the near infrared, at about 808 nm or 940 nm can be used.
  • the cover layer is permeable or reflective in this variant of the invention for the fixed laser wavelength, so that it is not removed by the laser radiation.
  • the absorbent areas of the positive mask on the other hand, strongly absorb the laser radiation and heat up until the underlying cover layer is dissolved or converted by the resulting heating or chemical reaction.
  • the invention also includes a security element for security papers, documents of value and the like having a carrier film with a cover layer, which has coatable regions in the form of patterns, characters or codes which can be produced in particular by transmitted light, which can be produced according to one of the method variants described above.
  • the security element may in particular be a security thread or a wide security band.
  • the security element is preferably equipped with an optically variable effect, preferably with a diffractive diffraction structure, in particular in the form of an embossed relief structure, and / or a Farbkipp concise harsh.
  • Fig.1 shows a schematic representation of a banknote 10 with a window security thread 12, which is provided with a recognizable in particular transparent transparency 14.
  • the negative writing in the embodiment for illustration only from the letter sequence "PL", it understands However, in practice, longer strings or strings, associated with patterns or codes, may be provided.
  • FIGS. 2 and 3 each show a cross section of the security thread at an intermediate step of the production method
  • FIGS Fig. 4 is a view of the finished security thread.
  • a transparent carrier foil 20 which has opposing main faces 22 and 24.
  • a mask 28 is printed on the second main surface 24 of the carrier film, which has openings 30 in the form of the desired negative writing.
  • the mask 28 is formed by a thin opaque white layer.
  • a full-surface opaque cover layer 26 is then applied.
  • a 30 nm thick aluminum layer is vapor-deposited on the carrier film 20 as cover layer 26.
  • Fig. 2 shows the carrier film after the printing of the mask 28 and the vapor deposition of the aluminum layer 26th
  • the cover layer 26 may in particular be the metallization layer of a diffractive diffraction structure, which is subsequently impressed into the carrier film, such as a hologram.
  • the cover layer 26 may also be formed by a more complex layer sequence, for example, by a thin-film element in other embodiments Color-shifting effect comprising a metallic reflection layer, a dielectric spacer layer and a semi-transparent absorber layer. Even such comparatively thick outer layers can be completely removed locally by the procedure described below and thus provided with a high-contrast negative information.
  • the carrier film 20, as in Fig. 3 shown irradiated from the side of the second main surface 24 with the radiation of a pulsed Nd: YAG laser with ⁇ 1.064 microns (arrows 32).
  • the laser radiation 32 is incident through the openings 30 of the mask and the transparent support film 20 on the aluminum layer 26, which is locally removed by the action of the laser radiation in the exposed areas or converted into a transparent modification.
  • coating-free regions 34 are formed in the otherwise opaque cover layer 26, as best seen in the top view of FIG Fig. 4 to recognize.
  • the introduced information appears as negative writing 34 in light of the dark metallic background of the cover layer 26. It is understood that other characters, patterns or codes can be introduced into the cover layer in the manner described.
  • the generation of negative information by masking and laser ablation offers two major advantages: Firstly, a color with fine pigments can be used for the printing of the mask, so that when using laser radiation in the near infrared line widths down to 5 microns can be achieved. With shorter wavelength laser radiation, the resolution may even be increased even further. On the other hand, the demetalization with the laser with a suitable choice of Beam parameters and beam guidance done very quickly, so that a high throughput is achieved.
  • the method according to the invention can advantageously also be combined with conventional demetallization methods, as described below with reference to FIGS. 5 to 9 explained.
  • a security element 60 comprising a transparent carrier film 62, an optional hologram embossing lacquer layer 64 and a color shift effect thin-film element 66 comprising an absorber layer 68, for example an 8 nm thick chromium layer, a dielectric spacer layer 70, for example a 450 nm thick layer of SiO 2 or MgF 2 , and a reflector layer 72, for example, a 40 nm thick aluminum layer consists.
  • an absorber layer 68 for example an 8 nm thick chromium layer
  • a dielectric spacer layer 70 for example a 450 nm thick layer of SiO 2 or MgF 2
  • a reflector layer 72 for example, a 40 nm thick aluminum layer
  • the reflector layer 72 is already provided with recesses 74 in the form of the desired negative writing, which were produced in an upstream process step, for example by a washing process of the type mentioned above or by an etching process.
  • the structured reflector layer 72 acts as a mask for the subsequently performed laser demetallization, wherein the Fig. 5 shows a situation in which the layer structure of the right image portion 76 has already been exposed to laser radiation 80, while the security element in the left part of the image 78 is not yet processed.
  • the thin chromium layer 68 can already be removed with such a low irradiation energy that the reflector layer 72 substantially remains intact, so that the laser creates a structured thin-film element with recesses 74 in the reflector layer 72 and congruent uncoated regions 82 in the absorber layer 68.
  • the dielectric spacer layer 70 is still present in the exemplary embodiment after laser application, but this does not affect the visual impression of the negative information, since the spacer layer 70 is transparent.
  • the described two-stage approach has the advantage that the removal of the thin absorber layer requires a significantly lower laser energy than the removal of the entire thin-film element.
  • the structured reflector layer itself is not removed and can therefore serve as a mask, so that it is possible to dispense with the application of a separate mask.
  • existing devices and process steps for a washing process or an etching step can be used further.
  • the layer structure of the thin-film element 66 may also be applied in reverse order to the carrier foil 62, as in FIG Fig. 6 shown.
  • the laser application 80 then takes place from the opposite side of the security element through the transparent carrier film 62.
  • the reflector layer 72 structured by a washing process acts as a mask for the laser ablation of the thin absorber layer 68.
  • a laser application 80 from the rear side of the carrier film 62 also lends itself to other designs. For example, as based on the Fig. 7 illustrated, first applied an aluminum layer 84 on a support film 62 and with a washing process in the form of the desired negative information be structured. On the aluminum layer 84, a color layer 86 is then printed in order to produce an example of copper or gold-colored color impression of the security element. During the laser treatment, the layer sequence of aluminum layer 84 and color layer 86 is subsequently exposed to laser radiation 80 from the rear side of the carrier film 62, wherein the structured aluminum layer 84 acts as a mask for the removal of the color layer 86. With a suitable adjustment of the laser energy, it is possible in this way to remove only the color layer 86 matched to the aluminum layer 84 and thus to introduce a negative information in a copper or gold-colored reflection layer.
  • the shows Fig. 8 a hologram foil 90, in which a color layer 92 is printed on a transparent carrier foil 62. Over the color layer 92, a hologram embossing lacquer layer 94 and a metal layer 96 of aluminum are deposited. Recesses 98 in the form of the desired negative information were introduced into the metal layer 96 by means of an etching process. In order to remove the ink layer 92 in the region of the recesses 98, the structure formed in this way is exposed to laser radiation 80, the structured metal layer 96 acting as a mask. The resulting hologram sheet 90 shows an example copper or gold hologram with transparent negative information.
  • the design of the Fig. 8 is used when the laser energy needed to remove the color layer 92 is small enough not to significantly affect the metal layer 96. If a higher energy is required, then, for example, after the etching process, the resist layer 100 applied to the metal layer 96 may initially be preserved, as in FIG Fig. 9 shown. The resist 100 then protects the metal layer 96 from undesired damage during the laser application and is removed only after the laser has been applied.
  • FIGS. 8 and 9 can of course be carried out with reverse layer construction. The sequence of the mask and the layer to be removed is then reversed and the laser application takes place from the back of the film.
  • FIGS. 10 and 11 show the principle of laser demetallization with mask technology on a moving film web.
  • the running film web 40 from the in 10 and 11 only one section is shown schematically, has the same structure as the security thread of Fig. 2 contains, therefore, a carrier film 20, on whose one major surface an opaque cover layer 26 and on the other major surface of a mask 28 is applied.
  • the running direction of the film web 40 is indicated by the arrow 42.
  • a possible high value compatible with the reliable introduction of the laser markings is selected for the web speed of the film web 40.
  • the film web 40 usually has several adjacent benefits, of which in 10 and 11 for the sake of clarity only one is shown.
  • the side-by-side benefits can be achieved either by deflecting the laser beam or by using multiple, For example, the width of a benefit detecting laser sources are covered.
  • the infrared radiation 44 of a diode laser 46 is deflected via an optical device 48 and thrown in the form of a laser spot 50 in the plane of the running film web 40.
  • the mask openings 30 of the mask 28 are in Fig. 10 for the sake of clarity compared to the laser spot 50 shown exaggerated.
  • mask apertures 30 are typically designed to produce microfonts or other micropatterns and thus significantly smaller than the extent of the laser spot, which may be a few millimeters or even a few tens of mm.
  • the laser beam 50 is therefore smaller than the relevant width of the film web 40.
  • the laser beam is therefore reciprocated in a direction 52 perpendicular to the web 42 in order to reach all mask openings along the width of the film web. This can be achieved for example in a conventional manner by a movable mirror or a mirrored polygon in the optical device 48.
  • a sufficiently strong laser source 46 it is also possible to dispense with scanning the width of the film web 40, as shown in FIG Fig. 11 shown.
  • the laser spot is generated in this variant by a suitable optics of the optical device 48 with such an extent in the plane of the film web 40 that it covers substantially the entire width of the film web or a benefit on the film web.
  • the local removal of the cover layer 26 can thus be done without deflection of the laser beam and thus at the highest possible speed.
  • a 13 mm wide film web 40 is driven at a web speed 42 of 100 m / min.
  • the laser source used is a continuous-wave diode laser 46 with an output power P of 2.8 kW.
  • an approximately rectangular laser spot 54 with a size of 13 ⁇ 8 mm 2 can be set on the film web, so that the entire width of the film web is covered by the laser spot.
  • an energy density of 130 kJ / m 2 which is sufficient for demetallizing a 30 nm thick aluminum layer 26 in the region of the mask openings 30, is obtained for each surface element applied.

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Claims (15)

  1. Procédé pour la fabrication d'un élément de sécurité pour des papiers de sécurité, des documents de valeur ou similaires, comportant un film de support avec une couche supérieure présentant en particulier des régions exemptes de revêtement perceptibles dans la lumière traversante, sous la forme de motifs, de caractères ou de codages, l'élément de sécurité comportant un élément en couche mince avec un effet de changement de couleur, lequel présente une couche réfléchissante, une couche absorbante et une couche d'espacement diélectrique disposée entre la couche réfléchissante et la couche absorbante, et la couche absorbante jouant le rôle de couche supérieure, et le procédé comprenant les étapes de procédé suivantes :
    - détermination d'une longueur d'onde de laser pour l'incorporation des régions exemptes de revêtement ;
    - mise à disposition d'un film de support avec des première et deuxième surfaces principales opposées ;
    - application d'une couche supérieure absorbant la longueur d'onde déterminée sur une première surface principale du film de support ;
    - application d'un masque définissant la forme des régions exemptes de revêtement, sur la première surface principale du film de support ; et
    - application d'un faisceau laser de la longueur d'onde déterminée sur la couche supérieure du film de support pourvue du masque, pour enlever localement la couche supérieure absorbante de la première surface principale ; dans lequel le masque n'est pas retiré après l'application du laser et forme une partie de l'élément de sécurité, le masque étant formé par une couche métallique, la couche absorbante de l'élément en couche mince étant appliquée en tant que couche supérieure, et la couche réfléchissante de l'élément en couche mince étant appliquée en tant que masque.
  2. Procédé pour la fabrication d'un élément de sécurité pour des papiers de sécurité, des documents de valeur ou similaires, comportant un film de support avec une couche supérieure présentant en particulier des régions exemptes de revêtement perceptibles dans la lumière traversante, sous la forme de motifs, de caractères ou de codages, l'élément de sécurité comportant un élément en couche mince avec un effet de changement de couleur, lequel présente une couche réfléchissante, une couche absorbante et une couche d'espacement diélectrique disposée entre la couche réfléchissante et la couche absorbante, et la couche absorbante jouant le rôle de couche supérieure, et le procédé comprenant les étapes de procédé suivantes :
    - détermination d'une longueur d'onde de laser pour l'incorporation des régions exemptes de revêtement ;
    - mise à disposition d'un film de support transparent pour la longueur d'onde de laser déterminée, avec des première et deuxième surfaces principales opposées ;
    - application d'un masque définissant la forme des régions exemptes de revêtement, sur la première surface principale du film de support ;
    - application d'une couche supérieure absorbant la longueur d'onde déterminée directement ou avec des couches intermédiaires sur le masque ; et
    - application d'un faisceau laser de la longueur d'onde déterminée sur la deuxième surface principale du film de support, pour enlever localement la couche supérieure absorbante de la première surface principale ; le masque n'étant pas retiré après l'application du laser et formant une partie de l'élément de sécurité, et le masque étant formé par une couche métallique, et la couche absorbante de l'élément en couche mince étant appliquée en tant que couche supérieure, et la couche réfléchissante de l'élément en couche mince étant appliquée en tant que masque.
  3. Procédé selon l'une au moins des revendications 1 ou 2, caractérisé en ce que le masque est appliqué directement après l'étape d'estampage d'une structure de diffraction dans le film de support.
  4. Procédé selon la revendication 3, caractérisé en ce que pour la structure de diffraction, le masque est positionné de manière à ce que l'information formée par les ouvertures dans le masque coïncide avec une information formée par la structure de diffraction.
  5. Procédé selon l'une au moins des revendications 1 à 4, caractérisé en ce qu'un masque négatif est appliqué en tant que masque, dont les régions transparentes pour le faisceau laser de la longueur d'onde prédéterminée définissent la forme des régions exemptes de revêtement souhaitées.
  6. Procédé selon la revendication 5, caractérisé en ce que le masque négatif comporte des ouvertures présentant la forme des régions exemptes de revêtement souhaitées.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que le faisceau laser est appliqué sur une grande surface du film de support, afin de détecter simultanément une pluralité d'ouvertures de masque ou de régions transparentes du masque.
  8. Procédé selon l'une au moins des revendications 1 à 7, caractérisé en ce qu'une marque de laser est produite avec une source laser dans le plan du film de support, et le film de support est guidé devant la marque de support le long d'une direction de défilement.
  9. Procédé selon la revendication 8, caractérisé en ce que la marque de laser est déplacée en valeur d'amplitude-et-vient le long de la direction de la largeur du film de support en mouvement, laquelle s'étend perpendiculairement à la direction de défilement.
  10. Procédé selon la revendication 8, caractérisé en ce que la marque de laser est produite avec une telle extension dans le plan du film de support, qu'elle engobe, sans déviation de faisceau, quasiment la totalité de la largeur d'au moins une utilité du film de support, laquelle s'étend perpendiculairement à la direction de défilement.
  11. Procédé selon la revendication 10, caractérisé en ce que le film de support est guidé devant la marque de laser avec une vitesse de défilement d'environ 50m/mn ou plus, de préférence d'environ 100m/mn ou plus.
  12. Procédé selon l'une au moins des revendications 1 à 11, caractérisé en ce qu'un ou plusieurs lasers dans la plage spectrale visible ou infrarouge, en particulier des lasers Nd:YAG ou des lasers à diodes, sont utilisés pour l'application du laser.
  13. Élément de sécurité pour des papiers de sécurité, des documents de valeur ou similaires, avec un film de support comportant une couche supérieure présentant des régions exemptes de revêtement perceptibles en particulier dans la lumière traversante, sous la forme de motifs, de caractères ou de codages, l'élément de sécurité comprenant un élément en couche mince avec un effet de changement de couleur, lequel comporte une couche réfléchissante, une couche absorbante et une couche d'espacement diélectrique disposée entre la couche réfléchissante et la couche absorbante, et la couche absorbante jouant le rôle de couche supérieure, et pouvant être obtenu à l'aide du procédé selon l'une des revendications 1 à 12.
  14. Élément de sécurité selon la revendication 13, caractérisé en ce que l'élément de sécurité est un fil de sécurité ou une bande de sécurité large.
  15. Document de valeur, en particulier un billet de banque, doté d'un élément de sécurité selon l'une des revendications 13 ou 14.
EP06014552.1A 2005-07-25 2006-07-13 Dispositif de sécurité et méthode de fabrication Not-in-force EP1747905B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005034671A DE102005034671A1 (de) 2005-07-25 2005-07-25 Sicherheitselement und Verfahren zu seiner Herstellung

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EP1747905A2 EP1747905A2 (fr) 2007-01-31
EP1747905A3 EP1747905A3 (fr) 2014-07-09
EP1747905B1 true EP1747905B1 (fr) 2016-05-04

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Cited By (1)

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CN110774795A (zh) * 2019-10-12 2020-02-11 中国人民银行印制科学技术研究所 防伪元件和防伪元件的加工方法

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DE102006034854A1 (de) 2006-07-25 2008-01-31 Ovd Kinegram Ag Verfahren zur Erzeugen einer Lasermarkierung in einem Sicherheitsdokument sowie derartiges Sicherheitsdokument
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DE102018004054A1 (de) * 2018-05-18 2019-11-21 Giesecke+Devrient Currency Technology Gmbh Herstellungsverfahren für ein Sicherheitselement
EP3881943A1 (fr) * 2020-03-20 2021-09-22 Karl Wörwag Lack- und Farbenfabrik GmbH & Co. KG Feuille de laque de transfert destiné à laquer une pièce
US20230333293A1 (en) * 2022-04-15 2023-10-19 Precision Converting Technologies, LLC Optical security feature

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CN110774795B (zh) * 2019-10-12 2021-06-08 中钞印制技术研究院有限公司 防伪元件和防伪元件的加工方法

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