EP3079918B1 - Élément de sécurité et procédé de vérification à effet optique fonction de l'excitation dans la gamme des longueurs d'onde non visibles - Google Patents

Élément de sécurité et procédé de vérification à effet optique fonction de l'excitation dans la gamme des longueurs d'onde non visibles Download PDF

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Publication number
EP3079918B1
EP3079918B1 EP14809440.2A EP14809440A EP3079918B1 EP 3079918 B1 EP3079918 B1 EP 3079918B1 EP 14809440 A EP14809440 A EP 14809440A EP 3079918 B1 EP3079918 B1 EP 3079918B1
Authority
EP
European Patent Office
Prior art keywords
wavelength
security element
light
intensity
excited state
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.)
Active
Application number
EP14809440.2A
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German (de)
English (en)
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EP3079918A2 (fr
Inventor
Stefan TRÖLENBERG
Jörg Fischer
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Bundesdruckerei GmbH
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Bundesdruckerei GmbH
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Publication date
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Publication of EP3079918A2 publication Critical patent/EP3079918A2/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
    • B42D25/30—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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/369—Magnetised or magnetisable materials
    • 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
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • 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
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties

Definitions

  • the invention relates generally to a security element having an excitation-dependent optical effect in the non-visible wavelength range, wherein the excitation is not irradiation of light, and a method for verifying such a security element.
  • the proposed security element comprises a recording material in which at least one volume hologram is stored, and at least two separately formed electrodes, to which a voltage can be applied and / or which can be charged, wherein the at least two electrodes and the recording material are formed and mutually are arranged that when applying the voltage and / or an application of charges at least one local mechanical change, in particular deformation, of the recording material occurs, so that a reconstruction of the volume hologram is at least locally changed, wherein at least one elastic element between the recording material and a the at least two electrodes are arranged.
  • the document thus shows an electrically stimulable volume hologram.
  • An electrical voltage can influence an optical effect. In a verification, for example, an occurrence of a disturbance of the reconstruction of the hologram is checked depending on the applied voltage.
  • printing inks are known whose color impression is brought about by means of microparticles contained in one color, which are aligned with one another and arranged in a crystal structure.
  • This crystal structure ensures that light of a specific wavelength can propagate only along certain directions or not at all in the crystal structure and is reflected accordingly. This causes a color impression due to the wavelength-selectively reflected light.
  • the WO 2010/142553 A1 describes a security feature for securing value documents with a plurality of microcapsules, each having a wall and in each of which a liquid medium is contained, in which a plurality of magnetic particles are distributed, which are movable in the liquid medium and their arrangement within the microcapsule
  • the action of a magnetic field is variable, wherein the magnetic particles are adapted to be arranged within the microcapsule so that they form a light-diffractive regular structure.
  • the WO 2010/142391 describes a security element with a changeable by an external magnetic field visual appearance. It is provided that the security element has a multiplicity of microcapsules which contain a suspension of a carrier liquid and magnetic nanoparticles which reversibly form a so-called photonic crystal in an external magnetic field of a magnet in the microcapsules.
  • a method for forming an optically variable safety device is described.
  • a photonic crystal material is provided, and a method is applied to the material causing deformation of the material to form a first region for which the incident light received by the crystal material is selectively reflected or transmitted to a first region to produce optically variable effect, and to form a second area for which the received light produces an optical effect, which differs from the first optically variable effect.
  • Corresponding articles having a first and a second area are also disclosed.
  • the EP 2 463 111 further describes a printing medium, a printing method and a printing apparatus having a photonic crystal characteristic.
  • the photonic crystal characteristic printing medium comprises a medium in which a plurality of particles having electric charges are dispersed, the interparticle spacings of the particles being controlled by generating an electric field or a magnetic field in the medium, and fixing the interparticle spacings of the particles, by introducing the energy into the medium.
  • the invention is therefore the technical object of the invention to provide a novel security element and a method with which the security element is verifiable in a simple manner.
  • the invention is based on the idea of further developing the structure inks known from the prior art, which have an optical effect similar to that of a photonic crystal, and to provide security elements, in particular for value or security documents.
  • the properties of the colloidal particles are adjusted so that the optical interaction takes place in the structure-excited state of the structure color with light in the non-visible wavelength range.
  • a size of the colloidal nanoparticles is adjusted, so that when a suitable electric or magnetic field is formed in the area of the printed structure color, a crystal lattice structure is produced which interacts with light in the UV wavelength range or in the IR wavelength range, but has its visible effect in the visible wavelength range not changed.
  • the security element and also a security document for the one wavelength are transparent in the non-structurally excited state.
  • security features Features that can be used for verification and thus provide protection against unauthorized duplication or creation, tampering or the like are referred to as security features.
  • Entities having at least one security feature are referred to as security elements.
  • security elements Entities having at least one security feature.
  • any physically trained object that includes at least one security feature is a security element.
  • Security documents include i.a. Badges, driving licenses, identity cards, but also banknotes, postage stamps, visas and fake labels and cigarettes, tickets or the like.
  • Value documents are security documents to which a value is assigned, eg banknotes, postage stamps etc.
  • luminescent pigments Pigments which show emission of light as a result of excitation, for example exposure to UV light, are referred to as luminescent pigments.
  • the emission caused by the excitation is referred to as luminescence, the excitation as luminescence excitation.
  • a preparation that can be used to print information is also referred to as ink or ink.
  • a preparation whose color impression produced in the printed state is caused by pigments which absorb and / or remit / reflect certain wavelengths of light independently of environmental conditions and / or excitation are referred to as body colors.
  • Printing preparations or printing inks or inks whose color impression in the printed state is caused by the fact that a plurality of particles are arranged in a crystal-like regular structure, so that a light propagation of individual wavelengths through the crystal structure only in certain directions or not at all and this is a color impression caused, are referred to as structure colors.
  • a color of light is determined by a wavelength of light.
  • a color is also called spectral color since, when a radiation comprising light of a continuous wavelength spectrum is split into wavelength-selective components, this component in each case produces a color impression characteristic of the selected wavelength.
  • the visible wavelength range only covers the wavelength of about 380 nm to 780 nm, ie only wavelengths from this range cause a color impression in a human observer, it is assumed here that also light in the UV wavelength range with wavelengths less than 380 nm or in the IR Wavelength range with wavelengths greater than 780 nm has a color that corresponds to the respective wavelength.
  • the non-visible wavelength range includes UV light with wavelengths below 380 nm and IR light with wavelengths greater than 780 nm.
  • the decisive factor is that light from these wavelengths is optically imperceptible to humans.
  • Particularly preferred wavelength ranges of the invisible wavelength range include the wavelengths 190 nm to 380 nm and 780 nm to 1100 nm.
  • the light of these preferred ranges can be easily detected with silicon-based semiconductor detectors.
  • CMOS and CCD sensors can be used for the detection of non-visible light in the preferred wavelength ranges between 190 nm and 380 nm and 780 nm and 1100 nm.
  • white light is here considered an electromagnetic broadband radiation with a continuous wavelength spectrum, which also includes the infrared wavelength range and the UV wavelength range.
  • the EP 2 463 111 A2 are known pressure preparations, which are structural colors.
  • printing preparations comprising a plurality of nano- or microparticles having electrical or magnetic properties which are arranged in an electric or magnetic field relative to each other in a crystal-like regular structure.
  • the crystal-like structures can be photonic crystals.
  • a photonic crystal is a regular periodic structure that promotes or suppresses light propagation for single or multiple wavelengths due to quantum mechanical effects. This creates a color impression of the corresponding photonic crystal.
  • Structure colors which have a changed color impression when excited, are also in the EP 2 463 111 A2 described. These may be formed so that the printing preparation comprises microcapsules enclosing a substrate or medium in which in turn a plurality of colloidal particles are arranged which have an electrical or magnetic property and in an electric or magnetic field relative to each other to a crystal or to arrange a crystal-like structure.
  • the colloidal particles may be, for example, charged particles comprising, for example, aluminum, copper, silver, tin, titanium, tungsten, zirconium, zinc, silicon, iron, nickel, goblin or the like.
  • the particles may further comprise a substance containing a polymer material, for example, polystyrene (PS), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), etc.
  • PS polystyrene
  • PE polyethylene
  • PP polypropylene
  • PVC polyvinyl chloride
  • PET polyethylene terephthalate
  • Embodiments may charge uncharged particles with a charged material.
  • particles may be coated with metal inorganic oxides such as silicon oxide SiO x , titanium oxide TiO x , etc.
  • metal inorganic oxides such as silicon oxide SiO x , titanium oxide TiO x , etc.
  • polymer material coated particles coated with ion exchange resins and many more can also be used.
  • EP 2 463 111 A2 a variety of exemplary embodiments is described.
  • Field-free is a space in which neither an electric nor a magnetic field is present. For the purposes of the objects described here, this is understood to mean the absence of an externally adjusted electrical or magnetic field. A field caused by magnetic particles or electrically charged particles intrinsically present in an article is left unattended. Similarly, the magnetic field strength caused by the earth's magnetic field is considered to be insignificant, so that a space is field-free despite the existing geomagnetic field, if no additional magnetic field is present in the room. Upon application of voltage to electrodes to form a field in the article, this field is not considered intrinsic.
  • the space is considered to be field-free if there is no electric field even if, for example, a magnetic field is applied to influence a viscosity of a magnetorheological fluid in the space ,
  • the space is field-free if there is no "outer" magnetic field with a field strength in the space that is greater than the field strength of the Earth's magnetic field.
  • a field strength which causes a structure excitation is denoted by E SA .
  • luminescent Printing inks or inks which, in the case of a luminescence excitation, in particular an irradiation of UV light, emit an emission of light, i. show a luminescence, are referred to as luminescent.
  • a time-resolved acquisition of a measured value or a quantity is understood to be the acquisition of this measured value or variable at different successive points in time.
  • the inventive security element with excitation-dependent alternating angle with light in the non-visible wavelength range is defined in claim 1.
  • a method according to the invention for verifying a security element, in particular a security element in a security document, is defined in claim 4.
  • a security element which is particularly suitable for security documents and value documents, and represents a hidden security feature in such a way that it is not recognizable without technical aids. As a rule, not even an existence of the security element is recognizable. Verification can be easily performed with a suitable light source emitting light in the non-visible wavelength region and a detection device capable of detecting light of the corresponding wavelength and a field generator for pattern excitation.
  • the existence of an increased reflection of the invisible light radiation in reflection or a reduced transmission in the excited state of the security element is checked.
  • An examination of the heightened Reflection or even occurring reflection of the non-visible light is preferred, since an increased absorption in the non-visible wavelength range can also occur for other reasons in a security element, so that other causes can also exist for a reduced or low transmission of the non-visible light.
  • the expected reflection intensity a small proportion of the irradiated light intensity can be selected, since reflection of light in the non-visible wavelength range on a physically formed security element or security document generally does not take place. For example, a value of 10% of the irradiated intensity can be assumed for the expected reflection. However, a value of 30%, 50% or even 80% can be set. This depends inter alia on the layer thickness of the security structure, ie the printed structure color amount per area and the concentration of the microcapsules in the structure color.
  • a transmission value of 70% or 50% or even 30% can be set.
  • a much more reliable verification makes possible an embodiment in which additionally the non-structure-excited state of the security element is brought about, and while the security element is in the nonstructured state, light with the one wavelength is irradiated on the security element and while the security element in the not -structured state, the intensity of the light reflected at the security element of the one wavelength is detected and / or the intensity of the light transmitted through the security element of the one wavelength is detected, and the reflected intensity detected in the non-pattern excited state is used as the expected reflection intensity and / or the transmitted intensity detected in the non-pattern excited state is used as the expected transmission intensity, and the security element is verified as genuine only when the reflected intensity detected in the structure-excited state is greater than the expected reflection intensity and / or the transmitted intensity detected in the structure-excited state is smaller than the expected transmission intensity.
  • clearly the effect of the structure excitation on the interaction with the non-visible light is detected.
  • field freedom is established in a space area in which the security element is located. This can be done for example by interrupting a current flow through a coil or other inductance, which generates a magnetic field in the region of the security feature as a structure excitation. Otherwise, alternatively or additionally, a voltage may be set to zero to "remove" an electric field caused by one or two electrodes.
  • inducing the structure-excited state includes generating a magnetic and / or electric field in the spatial region in which the security element is located. Electrodes may be disposed adjacent to the space such that upon application of a voltage, an electric field is generated in the security element and in the microcapsules. In some embodiments, the electrodes are already disposed and integrated in a security document adjacent to the security element. By applying a voltage to contacts connected to the electrodes, an electric field can then be generated reliably.
  • a magnetic field can be generated via a coil structure. For example, spiral-shaped conductor structures can be formed in a security document surrounding the security element. A current can then be fed into the helical conductive structure via contacts guided on a surface of the security document, which generates a magnetic field.
  • the electrical and / or magnetic field can also be generated via external structures not coupled to the security element.
  • the magnetic field can be increased, for example, by approaching a permanent magnet to the security element. By removing the permanent magnet, field freedom can be generated in the security element.
  • Particularly preferred are magnets in mobile phones, as they generate strong magnetic fields for the comparatively compact design and are available everywhere and available.
  • a wavelength in the UV wavelength range is selected as the one wavelength and irradiated upon irradiation of light of one wavelength UV light.
  • the security element the structure color in the non-structure-excited state, the increased transmissivity and reduced reflectivity for at least one wavelength in the UV wavelength range and exists in the structure-excited state, the reduced transmittance and the increased reflectivity for this at least one wavelength in the UV wavelength range.
  • the one wavelength is selected in the IR wavelength range and radiated when irradiating light of one wavelength IR light.
  • a security element is accordingly designed such that the structure color in the non-structure-excited state has the increased transmissivity and the reduced reflectivity for at least one wavelength in the IR wavelength range and in the structurally excited state the reduced transmissivity and the increased reflectivity for this at least one wavelength in the IR Wavelength range exists.
  • a filtering of the reflected and / or transmitted light is carried out in order to select the one wavelength or a wavelength range which comprises the one wavelength.
  • a filter is arranged between the security element and the detection device.
  • a photoluminescence which is caused by a UV or IR radiation, can then be distinguished from the reflection of the UV or IR radiation.
  • the luminescent light is blocked by the filter and so can not falsify the transmission or reflection measurement.
  • such a selection is advantageous in order to distinguish the carried out UV or IR reflection of a triggered luminescence.
  • an electrical and / or magnetic field strength is changed in the spatial area in which the security element is located while the excited state is brought about, and the intensity of the light of the one wavelength reflected and / or detected at the security element is detected the intensity of the light transmitted by the security element of the one wavelength is repeatedly executed and a dependence of the detected intensities of the reflected light of a wavelength of the electric and / or magnetic field strength with an expected reflection intensity dependence and / or a dependence of the detected Compare intensities of the transmitted light of a wavelength of the electric and / or magnetic field strength respectively with an expected transmission intensity dependence and verifying the security element only as true, if the dependence of the detected reflected intensities with the expected reflection intensity dependence and / or the dependence of the detected transmitted intensities the expected transmission intensity dependence match.
  • an angle in the range between 10 ° and 40 °, measured against a surface normal of the substrate of the security element, is preferably selected.
  • an angular dependence of the observed reflected intensity or intensity at the at least one wavelength in the structurally excited one may also be present Condition can be observed.
  • the security structure of the security element is structured laterally, for example in such a way that alphanumeric characters, pictograms or the like are printed on the substrate layer with the structure color and information is thus coded, the reflected intensity and / or transmitted intensity is dependent on spatially resolved detection from the structure excitation, the information stored by the structuring hidden information in the non-structure excited state and detectable in the structure-stimulated state.
  • Detection of non-visible transmitted or reflected light may be via a substrate layer which contains luminescent agents which are not excitable with light in the visible wavelength range, but exhibit a luminescence upon irradiation with the light of a wavelength in the non-visible wavelength range.
  • FIG. 1a to 1c and 2a to 2c is to be explained schematically by way of example the mode of action of different structural colors, which each contain microcapsules 10.
  • a structural ink contains a large number of such microcapsules, which are responsible for the color impression or the color of the structure color.
  • the microcapsules 10 each have a shell 11 which encloses a transparent substance 12 with colloidal particles, eg nanoparticles 13, contained therein.
  • the sheath 11 is formed of a transparent material.
  • the substance 12 is also transparent and constitutes a fluid in which the nanoparticles 13 according to the embodiments Fig. 1a to 1c, 2a to 2c can move.
  • the nanoparticles are for example clusters of iron oxide with a charged layer or plastic nanospheres with a charged coating. In other embodiments, they may also be paramagnetic particles. With regard to concrete embodiments of both the sheaths, the substances contained therein and the nanoparticles is in particular on the EP 2 463 111 A2 directed. In addition, structural inks containing such microcapsules and resulting in visible wavelength range dyeing are also available from Nanobrick, Gyeonggi-do, Korea.
  • Fig. 1a to 1c are the colloidal nanoparticles in the field - free space, which in Fig. 1a is shown, arranged irregularly.
  • the microcapsules 10 of the colloidal nanoparticles have no special optical property, so that they do not significantly influence the color impression of the structure color in which they are contained. This can thus be regarded, for example, as almost transparent in the printed state. If an electric field with a field strength E1 is applied, the charged nanoparticles align themselves to form a lattice-like crystal structure 15. This is in Fig. 1b and 1c shown. Since the nanoparticles themselves carry a charge, this leads to a repulsion between them.
  • a ratio of the electric field strength E1 or E2 to the own repulsion due to the charge determines a lattice spacing of the nanoparticles. Another factor is the Particle size. If an interaction with light of a wavelength in the UV wavelength range is to be brought about, the particle size must be selected to be correspondingly small.
  • the crystal structure thus formed has characteristics of a photonic crystal. In this, propagation is only possible along certain spatial directions for some wavelengths. For other wavelengths, propagation may not be possible in any direction. This means that all the light of this wavelength and from all the sinks is reflected. As a result, the color of the microcapsule is conditional.
  • FIG Fig. 1b For example, in the case of illumination with "white" light of a black body radiator, an infrared wavelength component is reflected at the field strength E1. If the electric field strength is increased to a value E2> E1, a distance between the nanoparticles is reduced since the ratio between the force due to the external electric field and the repulsive force between the like-charged nanoparticles is given a different ratio.
  • the crystal structure changes so that, for example, a UV component is now reflected from the "white” light of a black body radiator, so that the microcapsule for reflection show a UV wavelength range and have a "UV color”. This is in Fig. 1c shown.
  • Fig. 2a to 2c another embodiment of microcapsules 10 is shown schematically. These differ in that the colloidal particles already in the field-free space in the microcapsule 10 have a crystal structure 15, so that from the white light of a black body beam, for example, a color component of the far infrared (FIR) is reflected. As the field strength increases, the distance between the particles in the crystal lattice decreases, so that a near infrared (NIR) color component is now reflected. If the field strength continues to increase ( Fig. 2c ) the lattice spacing becomes even lower, so that again a color component of the near infrared (NIR) is reflected again.
  • NIR near infrared
  • Fig. 3a schematically the plan view of a security document 100 is shown, on which a security element 110 is applied in the form of a printing with a here designated as IR-structured ink printing preparation as a security structure.
  • IR structure color is a printing preparation, in which the structure-excited state is reflected by the microcapsules of the structure color IR light.
  • the security element is formed with the security structure as rectangular printing on a substrate. It is understood that any shape and graphics could be printed with the luminescent structure color.
  • a sectional view of the security document 100 is shown.
  • a document body which is formed from one or more substrate layers 160.
  • a surface 165 of one of the substrate layers 160 is printed with a structure color 210.
  • a cover layer 180 is arranged, which is transparent both for light in the non-visible wavelength range.
  • the substrate layers 160 may be transparent or opaque or, for example, only in the region in which the surface 165 is printed with the structure color 210, a transparent window for the light from the non-visible wavelength range.
  • Fig. 4a on the left is a schematic sectional view of a security document 100 with a security feature 110 shown.
  • the security element 110 comprises a security structure 115, which is printed with a structure color 210 on a surface 165 of a substrate layer 160.
  • the security structure 115 has a shape of a letter "A". This is intended to indicate that information is stored via a lateral structuring.
  • the substrate layer 160 is joined with a cover layer 180 to a document body 150. This can be done for example via a lamination process.
  • the security document 100 is transparent at least in the region of the security element 110 for the light having a wavelength in the non-visible wavelength range.
  • the security element in the structurally excited state is to reflect light with a wavelength in the UV wavelength range, for example 254 nm
  • at least the materials of the security document 100 except for the structure color 210 for light of the non-visible Wavelength, for example, for 254 nm are transparent.
  • the structure color 210 and thus the entire security element 110 is transparent to UV light with the wavelength 254 nm.
  • the entire Security document for the non-visible wavelength here for example 254 nm, transparent.
  • the security document 100 and the security element 110 are located at in Fig. 4a presented situation in the nonstructured state.
  • the security element is located in a field-free space.
  • a UV lamp 300 With a UV lamp 300, light 120 of a non-visible wavelength, for example with a wavelength of 254 nm, is irradiated onto the security element 110.
  • Light 121 of one wavelength of the non-visible wavelength range reflected on the security element 110 is optionally passed through a filter 311 and then to a detector 321.
  • the detector 321 may in the simplest case be a photodiode having a measurement sensitivity at the one wavelength of the incident light 120 has.
  • the detection device 321 may have an imaging or collection optics, not shown, to direct a plurality of photons on the photodiode.
  • Other embodiments may provide that a CCD camera or the like is used, which also has a measuring capability for the one in the one wavelength of the incident light 120, i. which has a wavelength of the invisible wavelength range. With a CCD camera, a spatially resolved detection of the intensity is possible.
  • the detection means may further alternatively or additionally comprise a conversion layer which converts incident light 121 of one non-visible wavelength into light 331 of another wavelength, preferably in the visible wavelength range.
  • the conversion layer may comprise a luminescent color with luminescent pigments. If, as in the example described, UV light of wavelength 254 nm is to be detected, then the reflected UV light 121 can be converted into light 331 in the visible wavelength range. This can be detected and evaluated by the human eye or a camera, for example a CCD-based camera.
  • An image 201 detected in reflection does not show any reflected light 121.
  • the intensity of the light in the non-visible wavelength range (or an intensity of the visible light 331 generated therefrom) is indicated by a hatch density in each case.
  • a contour 111 of the printed security structure 115 in the form of an "A" is shown only to indicate the position of the security structure 115 and the structural color 210 that forms the security structure 115.
  • the transmitted light 122 is preferably passed through a filter 312 to a detection device 322.
  • the above with regard to the detection of the reflected light 121 is analogous to the detection of the transmitted light 122.
  • the filter 312 and the detection means 322 may be correspondingly identical to the filter 311 and the detection means 321, if the measurement carried out in reflection and in transmission with a time delay become. In some embodiments, only either a measurement is performed in reflection or in transmission. Also in this case, only one filter and one detection device are needed at a time.
  • a detected image 202 of the transmitted light of the non-visible wavelength is homogeneously bright. The existence of the security element can not be noticed.
  • FIG. 4b are the security document and the evidence after Fig. 4a in the case that the security element is in the structure-excited state. This is indicated by E-field arrows 350.
  • Figure 201 shows a glowing "A".
  • the irradiated UV light 121 is reflected.
  • An intensity of the reflected light detected during the pattern excitation is greater than the intensity of the reflected light detected for the non-pattern excited state of the pattern color 210 of the security structure 115.
  • the shape "A" of the security structure 115 can be seen as negative in transmission, ie, the lateral shape of the structure color 210 printed on the surface 165 of the substrate layer 160 can be recognized as a dark area against a light background of the transmitted UV light 122.
  • the structure color 210 prevents in the structure-excited state, a transmission of the incident light with the wavelength of 254 nm.
  • the security element can be designed to interact with IR light.
  • the structure color and its colloidal particles as well as the structure excitation need only be adapted accordingly.
  • Fig. 5a to 5e is the situation of FIGS. 4a and 4b for a sequence in which the strength of the structure excitation is increased, for example the electric field strength. Measurements in reflection and in transmission are carried out for different excitation intensities. The respective detected intensities of the reflected non-visible light and the transmitted non-visible light are respectively shown in a spatially resolved representation. A strength of the excitation is schematically indicated in each case over a length of the field arrows causing E-field. The excitation field strength decreases monotonically from the situation of Fig. 5a to the situation of Fig. 5e to. With very little or no structure stimulation in Fig. 5a shows the same behavior as in Fig. 4a , Even with a very high structural stimulation, which in Fig. 5e is shown, the security element is not visible, ie, there is no reflection of the light with the non-visible wavelength and thus no attenuation in transmission.
  • Fig. 5b From an excitation strength, the in Fig. 5b For example, 30% of the incident light is reflected with the non-visible wavelength. The transmission decreases to 70%. With further increase of the stimulation strength, what in Fig. 5c is shown, the reflection increases to about 90% and the transmission decreases to about 10%. In Fig. 5d the situation is shown in which the maximum reflection of the incident light takes place with the non-visible wavelength, for example ideally a reflection of 100%. The transmission then drops to 0%.
  • the reflection intensity and the transmission intensity are each schematically for a location of the security structure of the security element Fig. 6a and 6b shown graphically.
  • Such a dependence of the reflection intensity on the structure excitation intensity and a dependence of the transmission intensity on the structure excitation intensity can likewise be used to verify the security element. Only if the structure color is identical in its properties to a structure color with which authentic security elements are manufactured, the same dependence of the reflection or transmission results for the light of a selected wavelength length in the non-visible wavelength range, as expected becomes. That to the Fig. 5a to 5e described procedure can also be chosen to find the optimal structure excitation.
  • the security document 30 comprises a total of five substrate layers 31-35 in the illustrated embodiment. Only the uppermost two substrate layers 31, 32 must be made transparent to light of a non-visible wavelength, in order to be able to execute reflection on the structure-enhanced security structure of the security element, which is printed on the middle substrate 33.
  • an electrically conductive planar or else grid-like structure is applied as the electrode 41, 42.
  • such an electrode 41, 42 can be formed transparently by means of zinc sulfite.
  • the electrode 42 arranged on the substrate layer 34 below the safety structure 115 is designed as a metal layer or metal grid.
  • the electrode 41 on the substrate layer 32 can also be formed by means of metallic wires or opaque conductive printed structures in the form of a grid having a high light transmission in the range of above 50% to preferably 90% in the visible wavelength range. However, it is particularly preferable to use a transparent electrode.
  • the electrodes 41, 42 are contacted by the various substrate layers with contacts 51, 52 on the uppermost substrate layer 31 in the assembled state.
  • Corresponding electrodes 53, 54 are correspondingly contacted with a conductive structure in the form of a coil on the middle substrate layer 33. This encloses the security structure 115. When a current is passed through the conductor loop 55, a magnetic field is created in the region of the security structure 115. Thus, particles which are paramagnetic can be aligned to a crystal structure similar to charged particles via an electric field.
  • top and bottom substrate layers 31, 35 serve essentially as protective layers. All substrate layers 31, 35 are preferably joined together by a high temperature lamination process. It is understood that additional additional security features may be incorporated into the security document 30 in any combination, such as security prints, holograms, other diffractive structures, electronic circuits, etc.
  • a security element is provided, for example, integrated in a security document 510.
  • field freedom in the area of the security element is brought about 520.
  • an irradiation of light with a wavelength in the non-visible wavelength range 530 takes place.
  • detection of the light with the wavelength possibly reflected by the security structure and / or transmitted through the security structure takes place in the non-visible wavelength range 540.
  • a structure excitation is carried out 620, for example by generating an electric field in the region of the security element or even a magnetic field, so that a structural stimulation of the structure color of the security structure of the security element takes place.
  • This may be a spatially resolved detection of the reflected light 641 and / or a spatially resolved detection of the transmitted light of the one wavelength in the non-visible wavelength range 642.
  • the intensities detected in method steps 540 and 640 are compared with one another 710.
  • the intensity of the reflected light of the wavelength in the non-visible wavelength range determined in the non-structure-excited state serves as the expected reflection intensity, which depends on the intensity of the reflected light in the structure-excited state of the security element must be exceeded.
  • the transmitted intensity detected in the structure-excited state must fall below a transmission intensity derived from the detected intensity of the non-structure-excited state in order to be able to verify the security element as genuine.
  • a verification decision is thus made 720, indicating whether the security element is real or not.
  • the verification decision is issued 730. It turns out that in simple embodiments, only the transmission or the reflection can be evaluated. It can also be applied to measurements in the non-structural state at all simple embodiments are dispensed with and a value can be specified as reflection intensity, which must be exceeded in the structure-stimulated state. The same applies to the transmission intensity to be undercut.

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Claims (10)

  1. Elément de sécurité (110) présentant une interaction, dépendante de l'excitation, avec la lumière dans la gamme de longueurs d'onde non visibles comportant
    une couche de substrat, et
    une structure de sécurité (115) formée sur la couche de substrat, laquelle structure est formée avec une couleur structurale (210), laquelle comporte des microcapsules (10) dans lesquelles sont contenues des particules colloïdales (13), qui peuvent être ordonnées et/ou réordonnées les unes par rapport aux autres suivant une structure de type cristal au moyen d'une excitation de la structure, laquelle implique une formation d'un champ électrique et/ou magnétique, dans lequel la structure de type cristal (15) présente des propriétés de réflexion et/ou de transmission de la lumière réglables et/ou influençables par le biais de l'excitation de la structure, dans lequel les microcapsules (10), dans l'état où la structure n'est pas excitée à au moins une longueur d'onde dans la gamme de longueurs d'onde non visibles, présentent un facteur de transmission élevé et un facteur de réflexion bas, de sorte que l'élément de sécurité, dans l'état où la structure n'est pas excitée à l'au moins une longueur d'onde dans la gamme de longueurs d'onde non visibles, est transparent, et les microcapsules (10), dans l'état où la structure est excitée, dans lequel, dans la zone des microcapsules (10), un champ électrique et/ou un champ magnétique générés par l'excitation de la structure existent, présentent un facteur de transmission réduit et un facteur de réflexion majoré en comparaison de l'état où la structure n'est pas excitée.
  2. Elément de sécurité (110) selon la revendication 1, caractérisé en ce que la couleur structurale (210), dans l'état où la structure n'est pas excitée, présente le facteur de transmission élevé et le facteur de réflexion bas à l'au moins une longueur d'onde dans la gamme des longueurs d'onde de l'ultraviolet et, dans l'état où la structure est excitée, le facteur de transmission réduit et le facteur de réflexion majoré existent à cette au moins une longueur d'onde dans la gamme de longueurs d'onde de l'ultraviolet.
  3. Elément de sécurité (110) selon la revendication 1, caractérisé en ce que la couleur structurale (210), dans l'état où la structure n'est pas excitée, présente le facteur de transmission élevé et le facteur de réflexion bas à l'au moins une longueur d'onde dans la gamme des longueurs d'onde de l'infrarouge et, dans l'état où la structure est excitée, le facteur de transmission réduit et le facteur de réflexion majoré existent pour cette au moins une longueur d'onde dans la gamme de longueurs d'onde de l'infrarouge.
  4. Procédé de vérification d'un élément de sécurité (110) selon l'une quelconque des revendications 1 à 3, lequel comporte une structure de sécurité (115) formée avec une couleur structurale (210), dans lequel la couleur structurale (210) comporte des microcapsules (10) dans lesquelles sont contenues des particules colloïdales (13), qui peuvent être ordonnées et/ou réordonnées les unes par rapport aux autres suivant une structure de type cristal au moyen d'une excitation de la structure, laquelle implique une formation d'un champ électrique et/ou magnétique, dans lequel la structure de type cristal (15) présente des propriétés de réflexion et/ou de transmission de la lumière réglables et/ou influençables par le biais de l'excitation de la structure, le procédé comportant les étapes :
    a) de provocation de l'état de l'élément de sécurité (110) où la structure est excitée, par formation d'un champ électrique et/ou magnétique dans la zone de l'élément de sécurité (110) transparent dans l'état où la structure n'est pas excitée à au moins une longueur d'onde dans la gamme de longueurs d'onde non visibles,
    b) de projection de lumière présentant l'au moins une longueur d'onde, qui se situe dans la gamme de longueurs d'onde non visibles, sur l'élément de sécurité (110), pendant que l'élément de sécurité (110) se trouve dans l'état où la structure est excitée, et
    c) de détection d'une intensité de la lumière présentant l'au moins une longueur d'onde réfléchie sur l'élément de sécurité (110) et/ou d'une intensité de la lumière présentant l'au moins une longueur d'onde transmise par l'élément de sécurité (110), respectivement pendant que l'élément de sécurité (110) se trouve dans l'état où la structure est excitée, et
    d) de comparaison de l'intensité réfléchie détectée dans l'état où la structure est excitée à une intensité de réflexion attendue et/ou de comparaison de l'intensité transmise détectée dans l'état où la structure est excitée à une intensité de transmission attendue ;
    e) de vérification de l'élément de sécurité (110) comme étant authentique, lorsque l'intensité réfléchie détectée dans l'état où la structure est excitée est supérieure à l'intensité de réflexion attendue et/ou que l'intensité transmise détectée dans l'état où la structure est excitée est inférieure à l'intensité de transmission attendue.
  5. Procédé selon la revendication 4, caractérisé en ce que
    l'état de l'élément de sécurité (110) où la structure n'est pas excitée est en outre provoqué, et
    pendant que l'élément de sécurité (110) se trouve dans l'état où la structure n'est pas excitée, la lumière présentant l'au moins une longueur d'onde est projetée sur l'élément de sécurité (110) et
    pendant que l'élément de sécurité (110) se trouve dans l'état où la structure n'est pas excitée, l'intensité de la lumière, présentant l'au moins une longueur d'onde, réfléchie sur l'élément de sécurité (110) est détectée et/ou l'intensité de la lumière, présentant l'au moins une longueur d'onde, transmise par l'élément de sécurité (110) est détectée,
    et l'intensité réfléchie détectée dans l'état où la structure n'est pas excitée est utilisée comme intensité de réflexion attendue et/ou l'intensité transmise détectée dans l'état où la structure n'est pas excitée est utilisée comme intensité de transmission attendue, dans lequel l'élément de sécurité (110) est vérifié comme étant authentique uniquement lorsque l'intensité réfléchie détectée dans l'état où la structure est excitée est supérieure à l'intensité de réflexion attendue et/ou que l'intensité transmise détectée dans l'état où la structure est excitée est inférieure à l'intensité de transmission attendue.
  6. Procédé selon l'une quelconque des revendications 4 ou 5, caractérisé en ce qu'un filtrage de la lumière réfléchie et/ou transmise est réalisé afin de sélectionner l'au moins une longueur d'onde ou une gamme de longueurs d'onde qui comporte l'au moins une longueur d'onde.
  7. Procédé selon l'une quelconque des revendications 4 à 6, caractérisé en ce que, pour provoquer l'état sans excitation, une absence de champ est produite dans une zone spatiale dans laquelle se trouve l'élément de sécurité (110).
  8. Procédé selon l'une quelconque des revendications 4 à 7, caractérisé en ce que la provocation de l'état où la structure est excitée implique la génération d'un champ magnétique et/ou électrique dans la zone spatiale dans laquelle se trouve l'élément de sécurité (110).
  9. Procédé selon l'une quelconque des revendications 4 à 8, caractérisé en ce que l'au moins une longueur d'onde est choisie dans la gamme de longueurs d'onde de l'ultraviolet et, lors de la projection de lumière présentant l'au moins une longueur d'onde, de la lumière ultraviolette est projetée, ou en variante, l'au moins une longueur d'onde est choisie dans la gamme de longueurs d'onde de l'infrarouge et, lors de la projection de lumière présentant l'au moins une longueur d'onde, de la lumière infrarouge est projetée.
  10. Procédé selon l'une quelconque des revendications 4 à 9, caractérisé en ce que, pendant la provocation de l'état avec excitation, une intensité de champ électrique et/ou magnétique dans la zone spatiale dans laquelle se trouve l'élément de sécurité (110) est modifiée, et une détection de l'intensité de la lumière, présentant l'au moins une longueur d'onde, réfléchie sur l'élément de sécurité (110) et/ou de l'intensité de la lumière, présentant l'au moins une longueur d'onde, transmise par l'élément de sécurité (110) est réalisée à plusieurs reprises et une dépendance des intensités détectées de la lumière réfléchie présentant l'au moins une longueur d'onde par rapport à l'intensité de champ électrique et/ou magnétique est comparée à une dépendance d'intensité de réflexion attendue et/ou une dépendance des intensités détectées de la lumière transmise présentant l'au moins une longueur d'onde par rapport à l'intensité de champ électrique et/ou magnétique est comparée respectivement à une dépendance d'intensité de transmission attendue et l'élément de sécurité (110) est vérifié comme étant authentique uniquement lorsque la dépendance des intensités réfléchies détectées concorde avec la dépendance d'intensité de réflexion attendue et/ou lorsque la dépendance des intensités transmises détectées concorde avec la dépendance d'intensité de transmission attendue.
EP14809440.2A 2013-12-10 2014-12-10 Élément de sécurité et procédé de vérification à effet optique fonction de l'excitation dans la gamme des longueurs d'onde non visibles Active EP3079918B1 (fr)

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DE102013225514.4A DE102013225514A1 (de) 2013-12-10 2013-12-10 Sicherheitselement und Verifikationsverfahren mit einem anregungsabhängigen optischen Effekt im nicht sichtbaren Wellenlängenbereich
PCT/EP2014/077286 WO2015086709A2 (fr) 2013-12-10 2014-12-10 Élément de sécurité et procédé de vérification à effet optique fonction de l'excitation dans la gamme des longueurs d'onde non visibles

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WO2017071656A1 (fr) * 2015-10-30 2017-05-04 北京柯斯元科技有限公司 Marquage anti-contrefaçon, système anti-contrefaçon, particules texturées utilisés dans un marquage anti-contrefaçon et leur procédé d'utilisation
FR3139397A1 (fr) * 2022-09-02 2024-03-08 Getelec Procédé pour modifier localement des propriétés d’un matériau composite et utilisation d’un tel procédé pour lutter contre de la fraude.

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GB0720550D0 (en) * 2007-10-19 2007-11-28 Rue De Int Ltd Photonic crystal security device multiple optical effects
DE102008020769B3 (de) 2008-04-21 2009-06-25 Bundesdruckerei Gmbh Sicherheitselement mit einem elektrisch stimulierbaren Volumenhologramm sowie ein Verfahren zu seiner Herstellung
DE102009025019A1 (de) * 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Sicherheitsmerkmal und Verfahren zur Herstellung eines Sicherheitsmerkmals
DE102009024447A1 (de) * 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Sicherheitselement mit veränderbarem optischen Erscheinungsbild
KR100953578B1 (ko) 2009-08-05 2010-04-21 주식회사 나노브릭 광결정성을 이용한 인쇄 매체, 인쇄 방법 및 인쇄 장치

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