EP2465703A2 - Elément de sécurité à couleur variable structuré - Google Patents

Elément de sécurité à couleur variable structuré Download PDF

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Publication number
EP2465703A2
EP2465703A2 EP11009882A EP11009882A EP2465703A2 EP 2465703 A2 EP2465703 A2 EP 2465703A2 EP 11009882 A EP11009882 A EP 11009882A EP 11009882 A EP11009882 A EP 11009882A EP 2465703 A2 EP2465703 A2 EP 2465703A2
Authority
EP
European Patent Office
Prior art keywords
layer
optically variable
front side
color
security element
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.)
Granted
Application number
EP11009882A
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German (de)
English (en)
Other versions
EP2465703B1 (fr
EP2465703A3 (fr
Inventor
Peter Schiffmann
Daniela Dr. Otto
Georg Dr. Depta
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
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Publication of EP2465703A2 publication Critical patent/EP2465703A2/fr
Publication of EP2465703A3 publication Critical patent/EP2465703A3/fr
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Publication of EP2465703B1 publication Critical patent/EP2465703B1/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
    • B42D25/20—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
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D2035/24—
    • B42D2035/30—
    • B42D2035/36—

Definitions

  • the application relates to a security element for a data carrier with a structured, optically variable ink layer, a data carrier with such a security element and a production method for such a security element.
  • Data carriers such as documents of value or identity documents, in particular identity cards, credit cards or passports, or other valuables, such as branded articles, are provided with security elements for the purpose of security, which permit verification of the authenticity of the article and which at the same time serve as protection against unauthorized reproduction. Furthermore, security elements often produce a highly visible visual impression, which allows a review of the security element even without technical aids, such as the naked eye.
  • a security element can be embedded in such data carriers, for example in a banknote or in a chip card, or designed as a self-supporting transfer element, for example as a patch or as a label, which is applied to a data carrier or other object to be secured after its production. Alternatively, however, the security element can also be integrated into the data carrier during production.
  • Data carriers in the context of the present invention are in particular banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers forgery, such as passports or other identity documents, and also card-shaped data carriers, in particular credit and chip cards, as well as production assurance elements, such as Labels, seals, packaging and the like.
  • the term "data carrier” also includes precursors, in particular non-executable precursors of such data carriers which, for example in the case of security paper, are present in quasi-endoser form and are processed further at a later time.
  • Such data carriers may contain windows or viewing windows, which are covered with a transparent film, which optionally forms the carrier for a security element.
  • such security elements can have optically variable elements or optically variable layers, which provide the viewer with different optical impressions, for example different color impressions, under different observation conditions, for example at different viewing angles.
  • optical interference layers can be present either over the entire surface or in pigment form.
  • Such interference layers typically have a thin film structure that includes a reflective layer, a partially transparent layer, and one or more intervening dielectric spacer layers. These are based, for example, on mica, on SiO 2 or on Al 2 O 3 .
  • Such interference layers are referred to as one or more layers according to the number of dielectric layers.
  • Inks with pigments such thin film interference layers for example, under the name Iriodin ® (single layer) or Colorcrypt ® (multi-layer) marketed by Merck KGaA.
  • Printing colors with multi-layer interference layer pigments such as are sold under the name OVI ® or OVMI ® of SICPA further, the pigments of the OVMI ® printing inks have an additional magnetic layer in the thin-film structure.
  • cholesteric or other liquid crystals can also be used. These are, for example, as liquid-crystalline silicone polymers prior to or as a cholesteric liquid crystal pigments in so-called STEP ® Colors ( "Shimmery Twin Effect Protection"). Furthermore, holograms, which include metallic layers typically formed by vacuum deposition, or diffraction gratings, at different viewing angles, also exhibit a different visual impression to an observer.
  • the various optical impressions for a viewer include, for example, a so-called color shift effect ("Colorshift”), in which different shades are recognizable for the viewer at different viewing angles.
  • Colorshift color shift effect
  • Different optical impressions can also arise because, under a certain viewing angle, the optically variable layer is completely transparent and thus invisible to a viewer, while it shows a hue at a different viewing angle (effect angle).
  • Such optically variable layers are often iridescent, that is they show a pearlescent, as it is known for example from shells or mica.
  • such pigments which, when the viewing direction is changing, show a color change are referred to as goniochromatic or optically variable pigments.
  • Multilayer interference layers and inks with multilayered interference layer pigments can have very different degrees of coverage. They can be highly opaque, have correspondingly low light transmission or are sometimes even completely opaque. In such optically variable layers with high coverage, the optically variable effect can be perceived usually without a dark or black background.
  • optically variable colors commonly used for security elements are not readily available to a counterfeiter. However, at least for an inexperienced or inattentive viewer, similar color impressions can also be achieved via other substances, as occur, for example, in nail polish. In principle, not only monochrome imprints of optically variable colors, but also two- and multi-colored imprints can be imitated.
  • Object of the present invention is to provide a security element with high protection against counterfeiting, in which in a simple manner Safety mark with different optical characteristics can be generated. It is a further object of the invention to specify a corresponding data carrier and a production method for such a security element.
  • the security element according to the invention for a data carrier comprises a transparent or translucent substrate with a front and a back side. It furthermore comprises an optically variable ink layer arranged in the viewing direction on the front side, referred to below as the optically variable front side layer, and an optically variable ink layer arranged on the rear side, hereinafter referred to as an optically variable back side layer.
  • the front side layer is either completely or partially arranged directly on the substrate or may be arranged on one or more layers arranged between the substrate and the front side layer.
  • the backsheet may be disposed either entirely or partially directly on the substrate, or one or more layers may be provided between the substrate and the backsheet.
  • the front-side layer and the back-side layer are arranged at least partially overlapping in the viewing direction, so that an overlap region is formed, in which both layers are arranged one behind the other when viewing the front side or the back side of the substrate.
  • At least one of the two color layers that is to say either the optically variable front side layer or the optically variable back side layer, optionally also both optically variable color layers, has at least one structuring formed by a change or recess in the front side layer and / or back side layer.
  • the structuring is a local change in an otherwise unchanged, uniform and uniformly designed optically variable ink layer.
  • the structured optically variable color layer is uniformly formed, at least in an environment of the structuring, such that the structuring as such can be recognized under suitable observation conditions.
  • the structured optically variable color layer outside the structuring is uniform and uniform in the entire overlapping area.
  • the change may be a change in color or any other visually or mechanically perceptible change in the optically variable ink layer.
  • the transparent or translucent substrate of the security element according to the invention is extensively extended and formed, for example, flat and thin.
  • the front and back sides form opposite sides of the substrate.
  • a transparent substrate has a high light transmittance in the entire visible wavelength range, which is preferably at least 80% at each point of the visible spectrum, preferably at least 90% or ideally 100%.
  • a transparent substrate is further preferably clear and enables an undisturbed observation of objects lying behind the transparent substrate in the viewing direction.
  • a translucent or semitransparent region visibly reduces the intensity of the light passing through it to a viewer and typically has a light transmission between 20% and 80% in the entire visible spectrum. It can be clear or milky.
  • an opaque substrate or optionally an opaque layer in the entire visible spectrum has a light transmission of less than 20%, preferably less than 10% and ideally 0%.
  • the transparent or translucent substrate has the same light transmission over the entire visual spectral range, so that no or only a slight change in color of passing light is visible to the viewer.
  • the term "optically variable” encompasses any change of the visual impression of a specific layer, in particular the front-side or rear-side layer according to the invention, perceivable by a viewer. Very often, the change perceptible by the viewer will be a change in color, brightness or contrast.
  • optically variable layer for the front layer and the back layer basically are those known in the prior art optically variable layers and colors in question, such as single layer interference layers, colors with single-layer interference layer pigments, such as Iriodin ® Colors of Merck, layer or multilayer interference coating pigments, for example Colorcrypt ® colors of Merck or OVI ® - or OVMI ® - colors from SICPA, but also colors with cholesteric liquid crystal or other pigments, for example STEPP® colors.
  • Iriodin pigments available from Merck are generally pigments having a core of mica which has an interference layer, in particular of titanium dichloride, iron chloride or of a combination of titanium dichloride and iron chloride.
  • the layer thicknesses of the interference layer are chosen so that they are in the wavelength range of the desired color (1st order) or at a multiple of the desired wavelength (2nd, 3rd, 4th, etc. order).
  • pigments having an interference layer thickness in the range of several times the desired wavelength often referred to as “higher order” pigments, are stronger in color than so-called “first order” pigments and have a higher coverage and lower light transmission.
  • first order pigments are stronger in color than so-called “first order” pigments and have a higher coverage and lower light transmission.
  • the observer can perceive a single characteristic color only at a certain viewing angle.
  • In the available from Merck Colorcrypt ® pigments are generally pigments having a core of silicon oxide having an interference layer, which comprises a plurality of layers, in particular intermediate layers.
  • the viewer thus perceives different colors under different viewing angles, but only in a relatively narrow wavelength range around a specific center wavelength.
  • the OVI ® pigments or OVI ® have -Farben SICPA to a viewing-angle dependent color-shift effect in a relatively wide wavelength range.
  • Colorcrypt available from Merck ® pigments are considerably more expensive than the Iriodin also available from Merck ® pigments in the making, so that Colorcrypt ® pigments are much more expensive than Iriodin ® pigments, which prevents counterfeiters cost reasons before these pigments and thus the protection against counterfeiting with Colorcrypt® pigments equipped inventive security elements additionally increased.
  • ColorCrypt® pigments from Merck can be clearly identified under the microscope, which can serve as a proof of authenticity when using suitable aids. It is understood that the effect pigments mentioned above or preferably used are to be considered as illustrative rather than restrictive.
  • Iriodin ® pigments are applied.
  • the coated surface should ideally be equipped with a substantially closed Iriodin ® -Pigment für.
  • An additional increase in the intensity of the hue is achieved by a calendering of the substrate, because the flat pigments align themselves even better in a plane. The calendering can be done both before and after the application of the pigments on the substrate.
  • such a security element is produced for a data carrier in that an optically variable ink layer is applied to a provided, transparent or translucent substrate both on the front side and on the rear side, so that an overlap region is created in which the optically variable front side layer and the optically variable backsize layer are arranged overlapping. Within the overlapping area, patterning in the form of a change or a recess is formed in the optically variable front side layer and / or in the optically variable back side layer.
  • the security elements according to the invention have a very high security against counterfeiting.
  • the structuring, in particular in the form of a cutout, in the front side and / or backside layer can in principle already take place when the front side layer or the backside layer is applied by the optically variable color layer with the structuring not being applied over the entire area but only in partial areas, so that the intervening areas form recesses and thus the structuring.
  • This can be done, for example, by means of known printing processes, such as the screen, gravure or flexographic printing process.
  • the optically variable front side layer and the optically variable backside layer are first applied over the entire surface of the substrate and suitably changed in a subsequent step, so that the inventive structure in the optically variable front side layer and / or backside layer is generated.
  • This can be done for example via a washing process, as in the EP 1 023 499 is described in the context of a demarcation demetallization.
  • the disclosure of said publication is included in the following application in this respect.
  • the structuring can be done by etching, ablation or lift-off. Other methods used in demetallization can also be used.
  • structuring is particularly preferably carried out by a laser treatment which appropriately changes or ablates the optically variable ink layer.
  • a laser treatment has the advantage that subsequently the desired structuring can be subsequently introduced into the security element, that is to say after completion and independently of the production method of the security element. Accordingly, it is easily possible via such a laser treatment to personalize or individualize the security element.
  • Suitable laser sources are CO 2 , Nd: YAG, Nd: YVO 4 lasers or other types of lasers in the wavelength range from UV to far-infrared, with the lasers often also advantageously operating at frequency doubling or frequency tripling.
  • laser sources are used in the near infrared, since this wavelength range fits well with the absorption properties of the substrates and printing inks used for value documents, in particular the optically variable colors. For example, printing inks that are transparent to laser radiation but colored or even opaque in the visible spectral range to the human observer can easily be specified for this area.
  • infrared lasers in the wavelength range of 0.8 microns to 3 microns are used. These can be operated in continuous operation or in pulsed operation with a pulse frequency of typically between 20 kHz and 80 kHz. The power used is typically between 0.5 watts and 4 watts.
  • the optically variable layers of the security element according to the invention can, as already mentioned above, be printed by means of known printing processes, such as the flexographic printing process. However, you can also vacuum evaporation, such as sputtering, reactive sputtering, physical vapor Deposition or chemical vapor deposition applied to the front and back of the substrate, in particular vapor-deposited.
  • the structuring introduced into the optically variable ink layer can be information-leading, that is to say it represents information for the viewer, which can be achieved, for example, via an alphanumeric character, a graphic or a motif. Such an information content improves the recognition or the recognition of structuring by a viewer.
  • a plurality of degrees of freedom result Creation of structuring that produces optical impressions and transition effects when changing between different observation conditions, for example, when switching between viewing in transmitted light, a front view, that is viewing the front in reflected light, or a plan view on the back, that is one View of the back in reflected light, possibly in front of different colored or different light backgrounds or black backgrounds.
  • Such structuring can then be used as a security identifier.
  • the front side layer and the back side layer of the security element according to the invention can consist of the same optically variable color and be of identical design, for example have the same layer thickness.
  • the front-side layer and the back-side layer are formed of various optically variable colors, which but are preferably of the same type.
  • Iriodin ® -Color a Colorcrypt ® -Color an OVI ® -Color or STEP-color is used for example for the front layer and the backing layer, with the colors used for the front layer and the back layer each in their color and / or in their color behavior, for example, the color shift behavior ("Colorshift”), distinguish and thus distinguishable to the viewer.
  • embodiments may have interesting optical effects in which the front side layer and the back side layer are preferably formed of different optically variable colors, but the optically variable colors are of different types.
  • a IRIODIN ® -Color or Colorcrypt ® -Color and for the backing layer may be provided - for example, for the front layer a OVI ®.
  • the structuring can be formed at the same time exclusively in the optically variable front side layer, exclusively in the optically variable backside layer or in register with both optically variable layers.
  • the introduction of such structuring will be described below using the example of a laser treatment. Instead of the laser treatment, however, all other structuring methods already mentioned can also be used and the different structuring methods can be combined with one another.
  • the front side and / or the backside layer are ablatable or changeable, in particular ablatable or changeable by laser irradiation.
  • Ablation by laser in the present document refers to all mechanisms that result in the removal of the corresponding layer the laser treatment result. This includes, for example, a sublimation.
  • the targeted interaction with only exactly one of the two optically variable color layers or with both optically variable color layers at the same time can on the one hand by a suitable choice of the laser parameters, such as wavelength, power and pulse duration, with regard to the components of the processed optically variable ink layer and optionally not to be processed optically variable ink layer can be achieved.
  • the optically variable colors underlying the optically variable color layers can be suitably selected or suitable additives can be added to the optically variable color layers, which preferably do not influence the color perceptible to a viewer and the color behavior of the optically variable layer perceptible to a viewer the laser radiation interact.
  • the components of the optically variable ink layer which produce the optically variable effect can be changed or destroyed so that the color of the optically variable ink layer is changed or removed at the points of laser treatment.
  • this can take place via targeted destruction of one or more of the layers involved.
  • liquid crystal pigments for example, the liquid crystal pigments themselves are destroyed.
  • the optically variable ink layer may contain components or additives which absorb the laser radiation, such that a local thermal heating of the optically variable ink layer takes place, for example, to destruction the components of the color layer which produce the optically variable effect or else lead to an ablation of the entire optically variable color layer, thus creating a structuring in the form of a recess in the optically variable color layer.
  • a suitable choice of such additives and the laser parameters a targeted structuring of only one of the two optically variable color layers or of both optically variable color layers can thus be carried out.
  • optically variable front side layer as well as the optically variable back side layer are structured by the laser irradiation at the same time, an exact registration patterning is created on the front side and the rear side of the security element.
  • individualizing, laser-manufactured through-windows can be created in such a security element by ablating the optically variable front-side layer as well as the optically variable back-side layer by the laser treatment.
  • the laser irradiation can be done both from the back, as well as from the front.
  • Such structuring in the laser treatment can be carried out primarily in highly opaque optically variable inks, such as OVI ® Colors, as they interact with the typically laser radiation, preferably absorb this.
  • the overlapping area is considered, in which the substrate of the security element is on both sides such a visually variable ink layer is coated.
  • An untreated security element thus shows the color and the color behavior of the backside layer when viewing the front side in reflected light, when viewing the backside in reflected light, the color and the color behavior of the backside layer, while when viewed in transmitted light the colored impression disappears, so that the see-through element in a gray tone which is determined by the degree of coverage, that is, the opacity of the front side layer and the back surface layer and optionally of the substrate.
  • a structuring is merely introduced into the front side layer, which consists in changing or removing the color and the color behavior of the front side layer, so that in the incident light the interaction region with the laser, for example, appears colorless and gray.
  • the laser treatment does not change the coverage of the front surface layer, and therefore when viewed in transmitted light, the interaction region appears in the same hue as the surrounding untreated area.
  • the structuring clearly recognizable in incident light disappears completely when viewed in transmitted light. If the structuring is informative, the information disappears in transmitted light. In other words, a digital change of information can take place.
  • the front side layer is ablated, that is to say a recess is produced in the front side layer, but the back side layer - as in the previous variant - is not changed. Accordingly, when viewing the front side in incident light in the laser-treated area, the color and the color behavior of the backside layer can be seen. When viewed in transmitted light disappears in the laser-treated Area of color impression produced by the backside layer and it appears in a gray tone, which is determined only by the degree of coverage, that is, the opacity of the backside layer (and optionally by the opacity of the substrate). This results in a lighter shade of gray in this area than in a surrounding, untreated area of the security element.
  • the front side layer is ablated and at the same time the color and the color behavior of the backside layer are changed or removed.
  • a gray tone is produced, which is preferably identical to the gray tone which results in a reflection of the laser-treated region according to the abovementioned first variant.
  • the gray tone of the treated according to the third variant area again depends only on the degree of coverage, that is the opacity of the backside layer, which is a lighter shade of gray than in the surrounding, untreated area and a lighter gray tone than in the according to the first variant laser-treated area in the transmitted light results.
  • the same gray tone results as in the laser-treated according to the second variant range.
  • the laser treatment of the front side layer and the rear side layer preferably takes place together in one step, so that the recess in the front side layer and the color-changed region in the back side layer are arranged in register with one another.
  • both the front side layer and the rear side layer are ablated at the same time.
  • the resulting recesses in the front side layer and the back side layer are therefore in registration with each other. Accordingly, there is a see-through window whose optical properties depend on the substrate of the security element. In this respect, light passing through when viewed through transmitted light can be clearly recognized, or even when viewed in incident light, a color of a background used, in front of which the security element is viewed, can be clearly recognized.
  • a plurality of different structurings are provided that have been produced using various of the abovementioned variants of the laser treatment.
  • This can be used, for example, to generate a digital change of information when changing the incident light view of the front side and the transmitted light view.
  • regions that are processed according to the second variant, and regions that have been processed according to the third variant show the same gray tone in transmitted light, with which such regions can not be distinguished by a viewer and are perceived as a uniform, contiguous region in adjacent arrangement. Accordingly, areas that are processed according to the first variant and areas that have been processed according to the third variant, when viewing the front in the incident light indistinguishable. Accordingly, these different areas can be combined to different information.
  • a first is present between the front side layer and the front side of the substrate in at least a first subregion of the overlap region dark or black, preferably ablatable, particularly preferably laserablatierbare color layer formed and / or formed between the backside layer and back of the substrate in at least a second portion of the overlap region, a second dark or black, preferably ablatable, particularly preferably laserablatierbare color layer. If the dark or black color layer is applied only on either the front side or the back side of the substrate, then it extends over the entire overlapping area.
  • the respective partial regions are configured such that their union amount extends over the entire overlap region.
  • the two sub-areas of the dark or black color layer on the front and on the back of the substrate complement each other so that either the dark or black color layer on the back or the dark or black color layer on the front is applied in the entire overlap area. This ensures that at each point of the overlap area a dark or black background is available for the front side layer and for the back side layer when viewed in incident light.
  • the dark or black color layers also overlap, so that within the overlap region the optically variable color layers results in a further overlap region with respect to the dark or black color layers on the front and back.
  • the entire overlap region of the optically variable color layers is then preferably divided into three different regions. In a first area, the dark or black color layer is applied only on the front side of the substrate, in a second area the dark or black color layer is applied only on the back side of the area and in a third area on both the front side and the back side the substrate applied a dark or black color layer.
  • Such a configuration of the security element is particularly suitable for low-opaque, optically variable color layers, for example, of Iriodin ® -, Colorcrypt ® - consist or STEP ® Colors which require a dark or black background, a sufficient visibility of their color and their color behavior sure. Since a dark or black color layer is applied in the entire overlap area - either on the back, on the front or on both sides of the substrate - there is always a dark or black background for the front side layer when viewing the front of the security element in reflected light and for the backside layer when viewing the back of the security element in incident light.
  • the said low-opacity colors are, at least as long as no special additives are added, transparent to laser radiation and thus can not initially be patterned by a laser. Such an interaction, in contrast, is possible with the at least partially underlying dark or black color layer.
  • the dark or black color layer is preferably a carbon black-based paint containing a Interaction with laser radiation of different wavelengths, in particular with laser radiation in the UV, VIS and IR range allows.
  • the dark or black color layer can be ablated by laser treatment, whereby an optionally overlying optically variable ink layer is also removed and corresponding recesses are created in the optically variable ink layer.
  • the above-described dark or black, optionally carbon black-based ink layer thus simultaneously assumes the function of a suitable background for low-coverage, optically variable ink layers as well as the function of creating an interaction possibility with the laser radiation.
  • this can also be achieved by two mutually different layers, so that, for example, the layer ensuring the interaction with the laser is arranged directly on the substrate, above that the color layer forming a dark or black background and above this the optically variable color layer.
  • optically variable color layers typically do not interact with a laser
  • an interaction with the laser preferably takes place exclusively in the dark or black color layer.
  • This is preferably ablatable, preferably laserablatierbar formed.
  • the respective overlying optically variable color layer is also removed. If such a dark or black color layer is applied both on the front side and on the back side of the substrate, then both dark or black color layers are removed at the same time with the respective front side and back side layers at the same time so that a see-through window with registration-accurate recesses on both Side of the substrate results.
  • the translucency or Transparency of the resulting see-through window corresponds to the translucency or transparency of the substrate.
  • a dark or black color layer is applied only to the front side of the substrate, only the front side layer is removed during laser irradiation, while the rear side layer remains unchanged. Conversely, if such a dark or black color layer is arranged only on the back side of the substrate, only the backside layer is removed during laser irradiation, while the front side layer remains unchanged. In this respect, the extent of the dark or black color layers within the overlap area determines which effects have laser irradiation.
  • the color and the color behavior of the front side layer result when the front side is viewed in reflected light, irrespective of whether the dark or black color layer is applied on the front side or on the back side of the substrate
  • the dark or black color layer provides a suitable background for the front side layer when viewing the front of the security element in reflected light.
  • the color impression of the optically variable layers disappears for the observer, resulting in a gray tone which depends on the light transmittance, that is the opacity, of the dark or black color layer.
  • the layer thickness of the dark or black color layers in the further overlap region can be reduced, resulting in uniform opacity in the entire overlap region when viewed in transmitted light. This can also be achieved by other suitable means, such as a reduced absorption coefficient.
  • a dark or black color layer is present only on the back side of the substrate.
  • the dark or black color layer is removed together with the (from the substrate) overlying backside layer, while the optically variable front side layer remains unchanged.
  • this results in a bright area which, given the assumed low degree of coverage of the optically variable front side layer, substantially corresponds to the transparency or translucency of the substrate. Looking at this area in reflected light on the front of the security element against a white background, the color of the optically variable front side layer returns and the white background is clearly visible.
  • this dark or black background replaces the previously existing dark or black color layer arranged on the back side of the substrate, in which case the color and color behavior of the optically variable front side layer can again be observed .
  • a laser-treated area when viewed against a dark or black background is indistinguishable from the surrounding untreated area, therefore, the structuring and any accompanying information is under consideration the front disappears in reflected light against a black background.
  • both dark or black color layers are ablated together with the respective front and back side layers.
  • a see-through window whose transparency or translucency corresponds to that of the substrate.
  • Such a see-through window exhibits substantially the same brightness when viewed in transmitted light as the previously described recesses in the areas in which the dark or black color layer is applied only on either the front side or the rear side.
  • the see-through window in transmitted light can not be distinguished from the recess in the first area.
  • the viewing window differs significantly from the recesses when viewed against a dark or black background in the first area, because therein the color and color behavior of the front side layer or the back layer occurs, while in the see-through window the black background is clearly recognizable.
  • this has various types of structuring of the optically variable front side layer and / or the optically variable back side layer.
  • a first patterning is formed only in the front side layer. This is then in an area in which the dark or black color layer is applied only on the front side of the substrate.
  • a second structuring is formed only in the optically variable backside layer. This is located in a region in which a dark or black color layer is formed only on the back of the substrate.
  • a third structuring comprises registering the front side layer and the back side layer and is formed in a region in which a dark or black color layer is formed both on the back and on the front side of the substrate.
  • the third structuring which forms the see-through window can be viewed in incident light both in the front and in the back, in the case of an information-carrying structuring, it is advantageous here to use information that can be seen both from the front side and from the front side has an easily comprehensible information content from the back, that is, which also has a information content in mirror-inverted representation. For example, reflection-invariant symbols come into question.
  • optically variable front side layer and / or optically variable back side layer additional security features, such as luminescent substances, substances with characteristic magnetic or electrical Properties or characteristic properties in the infrared spectral range, may have.
  • additional security features in conjunction with the security element according to the invention, can increase counterfeit security in a synergistic manner.
  • the additional security element can be chosen so that it also leads to a change in the additional security feature of the backside layer upon exposure to laser radiation, which leads eg to ablation of the front side layer and to a change in the color behavior of the backside layer.
  • the additional security feature also shows altered physical properties, such as altered luminescence properties or altered magnetic properties, altered properties of the electrical conductivity or altered properties with respect to irradiation with infrared light wavelength range.
  • altered physical properties such as altered luminescence properties or altered magnetic properties, altered properties of the electrical conductivity or altered properties with respect to irradiation with infrared light wavelength range.
  • the counterfeit security of the security element according to the invention is increased in a synergistic manner, since the or the additional security features greatly enhance protection against counterfeiting through the selection of physical properties which can be changed by means of laser radiation increase.
  • the dark or black, preferably ablatable color layer between front side layer and front side of the substrate and / or between backside layer and backside of the substrate has an additional security feature.
  • the additional security feature may, for example, again be additional security features described in connection with the optically variable front / back layer, such as luminescent substances, substances having characteristic magnetic or electrical properties, substances having characteristic properties when irradiated with radiation of the infrared wavelength range, etc.
  • the optically variable front / back side layer and / or the dark or black color layer contains one or more identical or different additives which the formation of a recess, in particular the structuring by means of an ablation, in particular laser ablation to promote.
  • the additive may, for example, be a substance which melts at low temperatures, such as, for example, a wax, in particular carnauba wax.
  • the described invention provides an optically variable security element which can be recognized without auxiliary means and which displays a digital information change which can easily be verified by untrained observers when viewed in transmitted light or when viewed in reflected light in front of a dark or black background, for example. It can easily be created in a single security element three different from their optical properties forth information.
  • the present invention provides an integrated in print design, pre-structured and customizable, verifiable without tools optical security element.
  • An inventive data carrier comprises a security element as described above.
  • the security element completely or partially forms a window area.
  • structuring of the security element in principle can also be continued beyond the actual security element, for example on the substrate of the data carrier.
  • a part of the structuring according to the invention can be generated after the security element has been arranged on a data carrier in the area of the security element and the substrate surrounding the security element of the data carrier and thus the security element can be "sewn" to the data carrier.
  • a structuring of the security element which is continued in an ideal Pass réelle in the region of the data carrier as a modification, in particular color change.
  • Such an embodiment is characterized by an extremely high counterfeit protection, since the security of the security element on the one hand and the data carrier on the other hand is additionally increased by a structuring connecting the security element and the data carrier.
  • Fig.1 is as a data carrier a banknote 1 shown with a window area 2, which includes a security element 3.
  • the arrangement of the security element 3 in a window area 2 allows the viewing of the security element 3 in transmitted light, in reflected light, both from the front and from the back, and also from different backgrounds.
  • FIGS. 2a to 2f a first embodiment of the security element is shown.
  • the security element is shown in cross section before the laser treatment.
  • a transparent substrate 4 for example a PET film
  • an optically variable front side layer 5 is arranged on the front side and an optically variable rear side layer 6 on the rear side.
  • the cross section in Fig. 2a FIG. 12 shows the overlapping area in which the optically variable front-side layer 5 and the optically variable back-side layer 6 are overlapped.
  • a black, soot-based ink layer 7 is arranged between the transparent substrate 4 and the front side layer 5.
  • a further black, soot-based ink layer 8 is arranged between the transparent substrate 4 and the optically variable backside layer 6 in a second partial region.
  • At least one of the two black color layers 7 and 8 is arranged at each point of the overlapping region of the optically variable color layers, that is to say the union of the first and second partial regions corresponds to the overlapping region of the optically variable color layers.
  • the black color layer 7 of the front side and the black color layer 8 of the rear side overlap.
  • both black color layers 7, 8 have a reduced layer thickness, such that a uniform opacity of the security element 3 results in transmitted light in the entire overlap area.
  • inventive concept is also realized with color layers 7, 8, which have no reduced layer thickness in the overlap region.
  • Such an embodiment (not in Fig. 2a shown) with a constant layer thickness of the ink layer 7, 8 is technically easier to manufacture and also visually attractive to the viewer.
  • a laser treatment now takes place, the result of which in Fig. 2b is shown in cross section.
  • optically variable ink layers 5 and 6 optically variable colors are used which do not interact with the laser radiation and are transparent to them.
  • an interaction takes place with the black color layers 7 and 8.
  • the black color layers 7 and 8 are ablated in the region of the laser irradiation and the overlying optically variable color layers 5 and 6 are then likewise removed.
  • the black color layers 7 and 8 are ablated in the region of the laser irradiation and the overlying optically variable color layers 5 and 6 are then likewise removed.
  • the black color layers 7 and 8 are ablated in the region of the laser irradiation and the overlying optically variable color layers 5 and 6 are then likewise removed.
  • the black color layers 7 and 8 are ablated in the region of the laser irradiation and the overlying optically variable color layers 5 and 6 are then likewise removed.
  • the in Fig. 2b shown left area thus
  • a recess is provided in the black ink layer 8 and the backside layer 6 (starting from the transparent substrate 4).
  • recesses are created in both black color layers 7 and 8 and the respective overlying front side layer 5 and the back side layer 6.
  • Fig. 2c is the impression created by a viewer in the transmitted light.
  • the entire overlap area appears at the locations where laser treatment has not taken place, in a uniform shade of gray, which depends on the opacity of the black color layer 7 and 8.
  • the transparent substrate is completely exposed by the laser irradiation. It therefore appears white in transmitted light (with incident white light). Because of the low degree of coverage of the optically variable colors used for the front side layer 5 and the rear side layer 6, the laser-treated areas in the left and in the right area of the security element also appear white in transmitted light.
  • Fig. 2d is a plan view of the front shown in front of a white background.
  • the color and color behavior of the front-side layer 5 are perceived because either the black color layer 7 or the black color layer 8 provides a suitable black background for the front-side layer 5.
  • This is absent in the laser-treated areas and because of the low coverage of the optically variable colors used for the front-side layer 5 and the back-side layer 6, their color recedes against a white background.
  • the white background can be clearly seen in all three laser-treated areas.
  • Fig. 2e again a top view is shown on the front, but this time in front of a black background.
  • This black background is clearly visible in the central, laser-treated area through the see-through window created there.
  • the black background now forms a suitable background for the front-side layer 5, which is why this area appears uniform with the surrounding area, so that the laser-treated area is no longer recognizable.
  • the black background forms a suitable background for the optically variable backsheet layer 6, which is why the color and the color behavior of the backsheet layer can be recognized in this area.
  • the laser-treated areas are information-sensitive, this can be used to generate a digital change of information, as is the case in the FIGS. 3a to 3c shown variant of the first embodiment is shown.
  • the structure of the variant corresponds to that of the first embodiment with the difference that the laser-treated areas are information-related recesses.
  • the information "50 EURO” arranged in the left-hand area is a recess in the front-side layer 5 and the color layer 7 arranged on the front side.
  • the information "*****" arranged in the central area is a see-through window. That in the right Area arranged hand symbol is a recess in the backside layer 6 and arranged on the back of black paint layer. 8
  • the three different pieces of information are in transmitted light Fig. 3a clearly recognizable.
  • the Fig. 3a corresponds with respect to the observation of the Fig. 2c ,
  • Fig. 3b the front is shown in reflected light against a black background.
  • the Fig. 3b corresponds with respect to the observation of the Fig. 2e , Accordingly, the non-laser-treated areas appear in the color of the front-side layer 5.
  • the information arranged in the left-hand area appears in the color of the back-side layer 6, the information arranged in the central area appears black, while the information arranged in the right-hand area disappears.
  • Fig. 3c the back is shown in reflected light against a black background.
  • the Fig. 3c corresponds with respect to the observation of the Fig. 2f , Accordingly, the non-laser-treated areas appear in the color of the backside layer 6.
  • the information arranged in the left area disappears, the information arranged in the central area appears black, while the information arranged in the right-hand area appears in the color of the front-side layer 6.
  • the color Colorcrypt Gold is used for the front side layer and the color Colorcrypt Green-Lilac for the backside layer.
  • the color STEP is copper red for the front layer and the color STEP green / blue for the back layer.
  • the color Colorcrypt Gold is used for the front side layer and the color STEP Green / Blue for the backside layer.
  • the color STEP is copper red for the front layer and the color STEP green / blue for the back layer.
  • the color STEP is copper red for the front layer and the color STEP green / blue for the back layer.
  • FIGS. 4a to 4f a second embodiment of the security element is shown.
  • Fig. 4a is a cross section of the security element shown before the laser processing.
  • an optically variable front side layer 5 and an optically variable backside layer 6 are applied.
  • OVI pigment paints are used which exhibit high coverage and low light transmittance and are nearly opaque. These colors do not need a black background.
  • Fig. 4b The security element is shown in cross-section after four different laser treatments in four different areas.
  • the laser treatment results in the destruction of the OVI pigments in the front-side layer 5 and thus in the removal of the color, while the layer itself remains on the substrate 4.
  • a second area second area from the left in Fig. 4b
  • a third portion third area from the left
  • the laser treatment results in ablation of the front surface layer 5 and destruction of the OVI pigments in the backside layer 6.
  • a fourth area in Fig. 4b shown right
  • the laser treatment leads to an ablation of the front side layer 5 and the backside layer 6, so that a see-through window is created.
  • Fig. 4c is that in Fig. 4b illustrated security element shown in transmitted light.
  • the color of the optically variable ink layers 5, 6 returns and the security element appears colorless and gray, possibly in different shades of gray.
  • a gray tone results, which is determined by the light transmittance, that is, the opacity, the front-side layer 5, and the back-side layer 6. This results in a dark gray tone.
  • the destruction of the OVI pigments can not be detected, since the color of the surrounding area in the transmitted light recedes anyway.
  • the gray tone is also determined by the opacity of the front-side layer 5 and the back-side layer 6, for which reason the first laser-treated region can not be seen in the transmitted light.
  • the brightness is determined only by the opacity of the back surface layer 6, and therefore the same lighter gray tone appears in these regions.
  • the see-through window in the fourth area appears bright, corresponding to the transparency of the substrate 4.
  • Fig. 4d is a plan view of the front of the security element when viewed in front of a white background shown.
  • the color and color behavior of the front-side layer 5 can be observed.
  • the first and the third area appear gray because of the destruction of the respective OVI pigments made there.
  • the backside layer 6 can be observed, which is why the color and the color behavior of the backside layer 6 result in this area.
  • the fourth area shows the white background behind the see-through window.
  • Fig. 4e the top view of the front of the security element 3 is shown, but in front of a black background. This is clearly visible in the see-through window of the fixed area.
  • the color perception corresponds to that perception of color in front of a white background. While the first and third areas might appear darker in gray, they still have the same shade of gray.
  • Fig. 4f is a plan view of the back of the security element in front of a black background. This is again clearly visible in the see-through window of the fourth area.
  • a gray hue is again formed, whereas in the first and second subarea, a change has taken place only in the front side layer which is now behind in the viewing direction, which is not perceived because of the high degree of coverage of the OVI color used for the backsheet.
  • Fig. 5a the different areas of the security element 3 are shown.
  • the area 9 corresponds to the first area Fig. 4b , Here only the color behavior of the front side layer 5 was changed.
  • the area 10 corresponds to the second area Fig. 4b , Here, the front side layer 5 was ablated.
  • the area 11 corresponds to the third area Fig. 4b , Here, the front-side layer 5 was ablated and the color behavior of the backside layer 6 changed.
  • Fig. 5b the security element 3 is shown in transmitted light.
  • the directly adjacent areas 10 and 11 are perceived with the same gray tone and thus as a uniform area, while the area 9 is not recognizable.
  • Fig. 5c the front of the security element 3 is shown in reflected light.
  • the directly adjacent areas 9 and 11 are perceived with the same shade of gray and thus as a uniform area, while in the area 10 the color and color behavior of the backside layer 6 is perceived.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
EP11009882.9A 2010-12-17 2011-12-15 Elément de sécurité à couleur variable structuré Not-in-force EP2465703B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010054854A DE102010054854A1 (de) 2010-12-17 2010-12-17 Strukturiertes Colorshift-Sicherheitselement

Publications (3)

Publication Number Publication Date
EP2465703A2 true EP2465703A2 (fr) 2012-06-20
EP2465703A3 EP2465703A3 (fr) 2013-04-03
EP2465703B1 EP2465703B1 (fr) 2016-04-06

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DE (1) DE102010054854A1 (fr)
ES (1) ES2571352T3 (fr)
PL (1) PL2465703T3 (fr)

Cited By (4)

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WO2015189404A1 (fr) * 2014-06-13 2015-12-17 Fasver Procédé de fabrication d'un support de données multicouche à marquage de sécurité et pouvant être marqué par laser
EP3594012A1 (fr) 2018-07-12 2020-01-15 Giesecke+Devrient Mobile Security GmbH Document de valeur pourvu de caractéristique de sécurité optique
CN114585519A (zh) * 2019-10-24 2022-06-03 凸版印刷株式会社 热敏转印介质及信息记录体
WO2023170146A1 (fr) * 2022-03-11 2023-09-14 Veridos Gmbh Support de données comportant des images de motifs qui sont visibles à partir de faces opposées, et procédé de fabrication correspondant

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
CN106585165B (zh) * 2016-12-06 2019-05-07 中钞特种防伪科技有限公司 光学防伪元件、光学防伪产品及其制作方法
DE102019126674A1 (de) * 2019-10-02 2021-04-08 Bundesdruckerei Gmbh Personalisierung einer Mehrzahl von Sicherheitselementen

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EP1023499A1 (fr) 1997-09-08 2000-08-02 Giesecke & Devrient GmbH Feuilles de securite pour papier billet de banque et leur procede de fabrication

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DE102004022080A1 (de) * 2004-05-05 2005-11-24 Giesecke & Devrient Gmbh Wertdokument mit visuell erkennbaren Kennzeichnungen
EP2174797A1 (fr) * 2008-10-07 2010-04-14 European Central Bank Document marqué au laser doté d'un effet de décalage de couleur

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EP0317514A1 (fr) 1987-11-20 1989-05-24 Lipatec Etablissement Procédé de fabrication d'un document, dont au moins une partie est non reproductible par photocopie
EP1023499A1 (fr) 1997-09-08 2000-08-02 Giesecke & Devrient GmbH Feuilles de securite pour papier billet de banque et leur procede de fabrication

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015189404A1 (fr) * 2014-06-13 2015-12-17 Fasver Procédé de fabrication d'un support de données multicouche à marquage de sécurité et pouvant être marqué par laser
FR3022183A1 (fr) * 2014-06-13 2015-12-18 Fasver Procede de fabrication d'un support de donnees multicouche a marquage de securite et pouvant etre marque par laser
US10357990B2 (en) 2014-06-13 2019-07-23 Fasver Method for manufacturing a multilayer data medium with security marking which can be marked by laser
EP3594012A1 (fr) 2018-07-12 2020-01-15 Giesecke+Devrient Mobile Security GmbH Document de valeur pourvu de caractéristique de sécurité optique
DE102018005551A1 (de) 2018-07-12 2020-01-16 Giesecke+Devrient Mobile Security Gmbh Wertdokument mit optischem Sicherheitsmerkmal
CN114585519A (zh) * 2019-10-24 2022-06-03 凸版印刷株式会社 热敏转印介质及信息记录体
EP4049850A4 (fr) * 2019-10-24 2022-12-28 Toppan Inc. Support de transfert thermosensible et corps d'enregistrement d'informations
CN114585519B (zh) * 2019-10-24 2024-03-12 凸版印刷株式会社 热敏转印介质及信息记录体
WO2023170146A1 (fr) * 2022-03-11 2023-09-14 Veridos Gmbh Support de données comportant des images de motifs qui sont visibles à partir de faces opposées, et procédé de fabrication correspondant

Also Published As

Publication number Publication date
DE102010054854A1 (de) 2012-06-21
EP2465703B1 (fr) 2016-04-06
EP2465703A3 (fr) 2013-04-03
ES2571352T3 (es) 2016-05-24
PL2465703T3 (pl) 2016-09-30

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