EP3079919A2 - Document de sécurité comportant une caractéristique de sécurité masquée - Google Patents

Document de sécurité comportant une caractéristique de sécurité masquée

Info

Publication number
EP3079919A2
EP3079919A2 EP14809654.8A EP14809654A EP3079919A2 EP 3079919 A2 EP3079919 A2 EP 3079919A2 EP 14809654 A EP14809654 A EP 14809654A EP 3079919 A2 EP3079919 A2 EP 3079919A2
Authority
EP
European Patent Office
Prior art keywords
color
color impression
printing information
security document
impression
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
EP14809654.8A
Other languages
German (de)
English (en)
Other versions
EP3079919B1 (fr
Inventor
Stefan TRÖLENBERG
Jörg Fischer
Olga Kulikovska
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.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP3079919A2 publication Critical patent/EP3079919A2/fr
Application granted granted Critical
Publication of EP3079919B1 publication Critical patent/EP3079919B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G07D7/02—Testing electrical properties of the materials thereof
    • 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
    • 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 to a security document and to a method for producing a security document which, under given ambient conditions, comprises an area which produces a uniform color impression but in which two different printing information are stored. Furthermore, the invention relates to a method for verifying such a security document.
  • Metameric colors are those colors which, when illuminated with white light from a black body radiator, produce the same color impression on a human observer whose spectrally resolved
  • Such a feature makes it possible to store covert information in a document which can be verified upon verification as to whether it actually exists.
  • the content of the first and second printing information can of course additionally evaluated and in a
  • security features Providing protection against unauthorized duplication or creation, tampering or the like are referred to as security features.
  • Security documents called. Security documents include ID cards, Driving licenses, identity cards, as well as banknotes, postage stamps, visas, as well as forgery-proofed labels and packaging, tickets or the like.
  • printing inks are also known from the prior art, the color impression of which is brought about via nano- or microparticles contained in the printing ink, which are arranged aligned with one another in a crystal-like structure.
  • printing inks which comprise in a printing medium a multiplicity of particles which are dispersed in the medium and have electrical or magnetic properties such that they align with one another in a crystal structure when an electric or magnetic field is applied.
  • This crystal structure ensures that light of certain wavelengths 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.
  • a body color can be spoken here of a structural color.
  • DE 10 2009 024 447 A1 discloses a security element with an optical appearance that can be changed by an external magnetic field. It is described that the security element has a multiplicity of microcapsules which contain a suspension of a carrier liquid and magnetic nanoparticles which reversibly form a photonic crystal in an external magnetic field in the microcapsules.
  • the object of the invention is an improved security document, a novel method for verification of a security document and a method for manufacturing of the security document, which comprise a novel security feature in which covert information can be stored.
  • the invention is based on the idea to form a field in a security document in which a first print information and a second print information are printed so that under predetermined environmental conditions, for example predetermined conditions with respect to an electric field and a
  • the second printing information is in this case printed with an ink or printing ink, which has a structure color whose evoked color impression on an excitation is variable in such a way that a color impression of the structure color of the second printing information during the action of the excitation of the
  • Pressure information is applied, a change in the color impression caused, since the structure color, with which the second printing information is formed, changes under the excitation in the changed environmental conditions so that a different color impression is caused.
  • the first print information is not changed with respect to the color impression or deviating from the second print information.
  • first areas and second areas are thus searched for, which produce an identical color impression in the first image, but in the further image, which is detected during the application of an excitation to change the color impression of the second print information, one from the other
  • the document can be classified as not genuine in a simple verification. It is important that the change of the color impression of the second printing information is caused by a structural change in the structure color and not by other effects. The color impression is thus based only on the remission and / or transmission properties of the document. A color impression caused by light emission is distinguished therefrom. The excitation of the structure color is such that it does not trigger light emission of the structure color. The structure color always acts passively in such a way that the color impression is not caused by a generation of photons, but only by the wavelength-selective light reflection and / or
  • 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 ambient conditions are referred to as body colors.
  • Printing preparations or inks or inks whose color impression in the printed state is caused by the fact that a plurality of particles in one are arranged crystal-like regular structure, so that a light propagation of individual wavelengths through the crystal structure only in certain directions or not at all possible and this is a color impression is caused, as
  • printing preparations which are structural inks.
  • printing formulations 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.
  • Structural inks which have a changed color impression upon excitation are likewise described in EP 2 463 11 1 A2. These may be configured such that the printing preparation comprises microcapsules enclosing a substrate in which a plurality of colloidal particles are arranged, which again have an electrical or magnetic property and in an electric or magnetic field relative to each other to a crystal or a Arrange 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), polyvinylchloride (PVC), polyethylene terephthalate (PET), etc.
  • uncharged particles may have a be charged material loaded.
  • particles with metal-inorganic oxides such as silicon oxide SiO x , titanium oxide TiO x , etc.
  • the substance in which the colloidal particles are arranged in the microcapsules may be a phase change material. This means that the material can be present in different phases, which have a different viscosity. Depending on the phase in which the substance is located, the colloidal particles dispersed therein may or may not align to form a crystal structure upon external excitation. Also, it is possible that a crystal structure induced by external excitation in one phase of the substance is "frozen” by a change of the phase of the substance, so that the crystal structure remains even after removal / removal of the excitation to orient the colloidal particles preserved.
  • the viscosity of the substance in the microcapsules, in which the colloidal particles are dispersed, which arrange themselves upon application of an electric or magnetic field to a crystal structure, is always maintained.
  • An electrorheological fluid is a fluid whose viscosity is adjustable or controllable via an electric field strength. In a room where no electric field is applied, an electrorheological fluid has a low viscosity. Colloidal particles dispersed therein thus have high mobility. When an electric field is applied, the viscosity sharply increases, so that mobility of particles dispersed therein is greatly restricted or inhibited.
  • a magnetorheological fluid is a fluid whose viscosity is adjustable or controllable via a magnetic field strength. In a space where no magnetic field is applied, a magnetorheological fluid has a low viscosity. Colloidal particles dispersed therein thus have high mobility. When a magnetic field is applied, the viscosity sharply increases, so that mobility of particles dispersed therein is greatly restricted or inhibited.
  • magnetic field are present.
  • this is understood to mean the absence of an externally specifically set electric or magnetic field.
  • a field caused by magnetic particles or electrically charged particles intrinsically present in an article is left unattended.
  • the magnetic field strength caused by the geomagnetic field is considered to be irrelevant, so that a room despite the existing geomagnetic field is field-free, if no additional magnetic field is present in the room.
  • the space is considered to be field-free if there is no electric field, even if, for example, a magnetic field is applied to affect a magenta-rheological fluid in the room in terms of its viscosity.
  • 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 security document comprises in a preferred embodiment an area in which a first print information and a second print information are stored, which produce an identical color impression under predetermined environmental conditions, so that under the given environmental conditions a homogeneous, uniform color impression for the first print information and the second print information in caused the area and the first pressure information and the second
  • Print information are not distinguishable due to the color impression caused, it being provided that the second pressure information is formed by means of an ink / ink having a structure color whose evoked color impression is variable via an excitation.
  • a set of state variables such as temperature, light irradiation,
  • the advantage of a security document executed in this way is that, under the given environmental conditions, the first and second printing information are indistinguishable and thus can not be perceived separately.
  • the predetermined environmental conditions coincide with normal conditions, ie, a temperature around the 21 ⁇ ⁇ prevails in a field-free space, and a consideration in a lighting with white light of a black body radiator is made, the first and the second pressure information are not separately perceived.
  • the fact that different information exists at all can not be found in the security document under these conditions. If, however, the structure color with which the second printing information is formed, via a
  • Excitation changed, for example, by the fact that an electric or magnetic field is generated in the area of the security document or the area in which the first and second pressure information are stored, then forms or changes a crystal structure and this the transmission and / or remission properties or reflection properties of the structure color in that only light of individual wavelengths or no wavelength of the visible spectral range and only in individual directions are transmitted through the crystal structure and for the other wavelengths or directions reflection takes place.
  • Structure color, with which the second printing information is printed, is selected and formed so that a color impression of the second printing information of the
  • the first printing information is formed by means of a further structure color, the color impression of which is brought about also being changeable via the excitation, wherein the further structure color, with which the first color
  • Printing information is formed during the action of the same excitation due to an induced change of an inner structure has a color impression that is different from the color impression of the second printing information.
  • pressure information is formed by means of structural colors, which, however, behave differently when excited.
  • Both structural colors have colloidal particles which have different diameters or sizes, or in which, alternatively or additionally, the substances in which the particles are dispersed differ in their properties.
  • a method for verifying such a security document which has a region in which a first printing information and a second printing information are stored, which produce an identical color impression under predetermined environmental conditions, so that under the given environmental conditions a homogeneous uniform color impression for the first printing information and the second Printing information is generated in the area and the first printing information and the second printing information is indistinguishable due to the color impression produced, comprising the steps of:
  • Evaluating a search for first areas and second area comprises, which cause an identical color impression in the first image, but cause in the at least one other image a different color impression and of which the second areas in the at least one other image have a color impression, the is different from the identical color impression of the first and second areas in the first figure;
  • Security document is classified as non-genuine, if no first and second areas are found with the specified properties. Accordingly, the document can be verified as genuine if first and second areas with the specified properties are found,
  • a document is classified as non-genuine if the first areas in the further image produce the same color impression as in the first image.
  • the verification method reliably makes it impossible to authenticate security documents that do not have the above-described security feature.
  • Such a security document can be produced by a method comprising the steps of: printing on a region having a first printing information and with a second printing information, which produce an identical color impression under predetermined environmental conditions, so that among the given
  • Printing information and the second printing information is generated in the area and the first printing information and the second printing information are indistinguishable due to the color impression produced, wherein the first printing information is formed and the second printing information is printed by means of an ink having a structural color whose color impression over an excitation is changeable.
  • the first printing information is formed with an ink or printing ink, the color impression of which is determined by means of a pigment
  • the color impression of the first information does not change.
  • the color impression in the first areas of all captured images is always the same regardless of the environmental conditions, i.
  • the first printing information and the second printing information can be printed so that they are printed side by side and each other at most at the edges where the with the different pressure information or
  • the first printing information is printed over the whole area in the area and the second
  • Print information can be formed with color pigments which have a body color or by means of a further structure color.
  • the second printing information may also first be printed over part of the area and the first printing information subsequently be printed over the entire area over the entire area. Regardless of whether the printing information or the surfaces printed therewith overlap each other, always first areas and second areas can be found which have a different color impression under changed environmental conditions.
  • the first areas found in the verification need not necessarily cover the entire area printed in the area with the first printing information.
  • the first printing information is printed with color pigments which have a body color
  • always first areas are found whose color impression does not change even when changing the environmental conditions.
  • second areas can be found which change their color impression when the environmental conditions change.
  • the area is a closed one
  • coherent area which as a whole has a simple geometric structure, For example, a square, a rectangle, a triangle, a circle, an ellipse, a star or the like as a base.
  • the structure color and, if present, additionally or alternatively the further structure color such that they comprise microcapsules in which colloidal particles, for example colloidal nanoparticles, are contained, which can be aligned with one another by means of an electrical and / or a magnetic field in order to create and / or modify a crystal structure, wherein distances between the particles are decisive for the color impression of the respective structure color.
  • the microcapsules with the nanoparticles contained therein, which are arranged in a crystalline structure under suitable environmental conditions thus provide the color impression of the respective structure color or respective structure ink.
  • Such microcapsules can be easily combined with a variety of chemical
  • the substance in the microcapsules is such that, under suitable environmental conditions, it ensures mobility of the colloidal particles contained therein to allow alignment of the colloidal particles in an electric and / or magnetic field, such that a structural change of the colloidal particles Entity is possible.
  • an electric field and / or a magnetic field are thus generated and / or changed in the security document when the environmental conditions change. This change must be brought about at least in the area in which the first and the second printing information are printed.
  • the colloidal particles are preferably charged or paramagnetic. Depending on this configuration, they may be via an electric field or a magnetic field to form a crystal structure-like arrangement
  • the verification method thus provides that, in establishing the given environmental conditions in the security document and when changing the
  • the colloidal particles contained in the microcapsules are arranged in a crystal structure, which to a
  • the security feature realized via the printing information introduced with different inks in the one area is not verifiable and unrecognizable when the security document is viewed in field-free space. It is only when forming an electric field or magnetic field in the area of the security document that a change in the crystal structure of the colloidal particles takes place and, as a result, the change in the optical properties which change the color impression.
  • the microcapsules are such that the nanoparticles contained in the microcapsules are not arranged in a crystal structure, which leads to a color impression in the visible wavelength range, if the
  • Capsules are in a field-free room.
  • the first printing information is printed with an ink which causes a color impression in the visible wavelength range under the given ambient conditions.
  • the predetermined environmental conditions are linked to a specific predetermined electrical and / or magnetic field, which has an identical color impression in the structural color of the second
  • Security document generates a given electric and / or magnetic field in the one area when creating the predetermined environmental conditions. Compared to these predetermined ambient conditions, a change is then carried out by increasing the field strength, which then leads to a change in the crystal structure at least in the one structure color of the second printing information which produces a different color impression for the second printing information in the visible wavelength range.
  • Magnetic field strengths to effect such changes are typically in the range of 5 mT to 30 mT.
  • Security document has at least two electrodes and the second
  • Electrodes are connected to contacts which are connected to one or different surfaces of the
  • Document body are guided to form over an application of a voltage to the contacts, the electric field between the electrodes.
  • a coil structure may be formed in the document body, which encloses, for example, the area in which the first and second printing information are printed.
  • the terminals of the coil may again be routed to contacts on one or several surfaces, so that a current can be fed into the coil via the contacts, which generates a magnetic field in the area in which the first and second printing information are printed.
  • a verification process may have further improvements.
  • Embodiment is provided that additionally changes the Ambient conditions are made and additional mappings are captured and evaluated with the first and the at least one further image and the evaluation of the additional mappings additionally for each of the additional mappings a search of first areas which do not change their color impression compared to the first image, and second Areas comprises, which in the first figure the same color impression as the first areas
  • Figures also first areas which do not change their color impression compared to the first image, and second areas are found, which have a color impression in the at least one of the additional images, which is different from the color impression of these second areas in the first figure.
  • the second regions of the further image and the at least one additional image in which second regions are found can be evaluated with regard to the color impressions and checked as to whether these overlap between the further and the additional image
  • Color changes of the first areas in the different environmental conditions are additionally or alternatively applied.
  • first regions are sought which differ in terms of their color impression from that of the second regions in the respective image and the color impression in the first image.
  • the verification can be further improved by pattern recognition being performed for detected second regions, information being derived therefrom and the derived information being compared with predetermined information and when the verification decision is made classifying a document as non-genuine if the derived Information does not match the given information. If a match is reached, a positive verification decision can also be made.
  • the derivation of information can be
  • the pattern recognition alphanumeric characters are determined, which are represented by the second printing information and these alphanumeric characters are compared with predetermined alphanumeric characters.
  • geometric figures such as circles, triangles, diamonds, trapezoids or the like can be derived as information content.
  • the color impression or the color impressions of the found second regions may be compared with expected color impressions, and in the case of the verification decision, a document may be classified as non-genuine if the color impressions of the one or more second regions are not within the framework of given tolerances with the expected color impressions match.
  • a detected color gradient can be compared to an expected color gradient as the electrical or magnetic field strength increases. If the first print information is printed with the further structure color, an analog evaluation for the first areas can be carried out.
  • phase states which one
  • the microcapsules contain a substance which changes its viscosity depending on an internal energy.
  • substances which, for example, significantly increase their viscosity when the internal energy is increased include, for example, electrorheological and magnetorheological fluids.
  • electrorheological and magnetorheological fluids In other substances takes place a temperature-dependent phase transition from a solid phase to a liquid phase at a melting or solidification temperature, which is for example in the temperature range of 35 ° C to 50 ° C.
  • the colloidal particles are then immobile in the substance at normal ambient temperatures in the range of about 21 ⁇ ⁇ , and are "held” by the substance
  • the colloidal particles are immutable in their mutual orientation.
  • Magnetic field prevents a rearrangement of the colloidal particles in an electric field.
  • Security document is brought about or maintained above a predetermined melting temperature of the substance in the microcapsules.
  • Other embodiments may provide that when the environmental conditions are changed and the environmental conditions are changed, first the environmental conditions relating to the electric and magnetic fields are set and varied as specified, but a temperature of the security document below a melting temperature the substance is held in the microcapsules and a first set of images is captured comprising the first image and the at least one further image or the first image comprising at least one further and the additional images captured at the temperature below the temperature threshold and are evaluated, and then in the security document a temperature above the melting temperature of the substance in the microcapsules is brought about and the induction and variation of the environmental conditions with respect to the electric and / or magnetic field are carried out again and a set of images is detected, the a first image and the at least one further image or a first image, at least one further image and additional images, which are recorded and evaluated analogously to the first set of images, and in the case of the verification decision the
  • Security document is verified as not genuine, if in the figures of the first set of images first and second areas are determined and a document is also classified as not genuine, although in the first set of images, no first and second areas are found, but in the evaluation of the second set of images produces a result which, in the evaluation of only one set of images at an indicated temperature, would result in rating the security document as non-genuine. Below the predetermined temperature threshold, therefore, no color-changing effect may be found. Above the temperature threshold, however, all the above-mentioned different verification steps, if executed, would have to be successful in order not to lead to classification and classification as a non-genuine security document.
  • a substance in the microcapsules should also be selected here which is approximately the same
  • the two imaging series should be recorded once for a temperature below both melting temperatures, and once for a temperature that is above both melting temperatures.
  • a verification method may be configured when an electrorheological fluid or a magnetorheological fluid is used as a substance in the microcapsules.
  • magnetorheological fluids correspond to the liquid phase in the above example.
  • one embodiment of the verification method envisages that when the environmental conditions are changed and the environmental conditions are changed on the one hand the ambient conditions with respect to the electric or magnetic field used to change the color impression of the structure color are set and varied as predetermined, but one physical parameter of the
  • Environmental conditions in the security document are set such that a substance in which colloidal particles are dispersed which imprint a color impression of the structure color through alignment with each other in a crystal-like structure inhibits or greatly restricts mobility of these particles, and a first set of figures, the first image and the at least one other image or the first image, the at least one more image and the additional
  • Figures include, recorded and evaluated, and on the other hand, the physical parameter according to the predetermined environmental conditions in the
  • dispersed colloidal particles which, by aligning with one another in the crystal-like structure, characterize the color impression of the structure color, are given for rearrangement and alignment, and induce and vary the
  • Ambient conditions with respect to the electric or magnetic field, which is used to change the color impression of the structure color, are also carried out and a second set of images, a first image and the at least one further image or a first image, at least one further image and includes additional mappings, analogous to the first sentence of
  • the security document is verified to be non-genuine when first and second areas are identifiable in the images of the first set of images, and a document is also classified as non-genuine if no first and second regions are found in the first set of mappings, however, a result is found in the evaluation of the second set of mappings which results in the evaluation of only one set of images
  • Ambient conditions occurs, wherein at the given environmental conditions, the structure color with the second pressure information is formed and the further structure color with the first pressure information, their color impression at the given environmental conditions respectively due to a caused by an external excitation according to the predetermined environmental structure of the respective Nanoparticles and / or microparticles have particles, wherein the structure at the given ambient conditions each differ from a structure in field freedom.
  • the metameric color impression is produced under given environmental conditions, in which both structure colors have a color-causing structure of the microparticles or nanoparticles, which are caused by an electric and / or magnetic field, which is different from zero.
  • the predetermined ambient conditions are thus selected and set so that the electrical and / or magnetic field strength each offset the structure colors in a changed color state compared to the color state, which prevails in field freedom.
  • This requires a precise coordination and selection of structural colors, as they must react differently to the externa ßeren suggestions, but still cause a metameric color impression under the given environmental conditions in which there is no field freedom. This is caused in each case by the crystal structure of the particles arranged on excitation and thus by a "real"
  • Structure color effects of the structure color and the other structure color caused During verification, it is checked whether the metameric color impression arises under the given ambient conditions. In the case of deviating ambient conditions, preferably in the case of field freedom, the first and second printing information, on the other hand, can be distinguished, since the structure color and the further structure color are different. If this effect is observed, a security document is verified as genuine. A forgery is very difficult, since two optimally coordinated different structural colors are needed.
  • Nanoparticles according to a first embodiment in field-free space (FIG. 1 a), at low field strength (FIG. 1 b) and at higher field strength (FIG. 1 c); schematically another microcapsule in another embodiment in the field-free space (Figure 2a), in the space with low field strength (Figure 2b) and in the room with higher field strength (Figure 2b). schematically another microcapsule with colloidal nanoparticles contained therein at a temperature below a melting temperature in the field-free space (Fig. 3a), with low field strength (Fig. 3b), with higher field strength (Fig. 3c) and at a temperature above a melting temperature in the field-free Space (FIG. 3d), in space at low field strength (FIG.
  • FIG. 3e schematic views of an area at different field strengths, which is printed with a first and a second printing information, wherein the second printing information is printed with a structure color; Further schematic views of an area at different field strengths, which is printed with a first and a second pressure information, wherein the second pressure information with another
  • Structure color is printed; further schematic views of yet another embodiment of a printed area at different field strengths, in which a first and a second print information are printed, wherein the second print information is printed with a structure color; schematic views of still another area, in which first and second printing information are printed, wherein the second printing information is printed with a structural color showing their structural change in excitation of the property only at a temperature above a melting temperature, wherein the Fig. 7a to 7c
  • Figures 7d to 7f show corresponding views at the temperature above the melting temperature.
  • a structure color contains a multiplicity of such microcapsules, which are responsible for the color impression of the structure color.
  • Microcapsules 10 each have a shell 11 containing a transparent substance 12 with colloidal particles contained therein, e.g. Nanoparticles 13, includes.
  • the sheath 1 1 is formed of a transparent material.
  • the substrate 12 is also transparent and constitutes a fluid in which the nanoparticles 13 can move in the embodiments according to FIGS. 1 a to 1 d, 2 a to 2 d.
  • 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.
  • specific embodiments of both the sheaths, the substances contained therein and the nanoparticles reference is made in particular to EP 2 463 11 1 A2.
  • structural colors are those
  • Microcapsules also available from Nanobrick, Gyeonggi-do, Korea.
  • the colloidal nanoparticles are arranged irregularly in field-free space.
  • the capsules 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, for example, as almost transparent in
  • the charged nanoparticles align themselves with one another and form a lattice-like crystal structure 15. Since the nanoparticles themselves carry a charge, this leads to a repulsion between one another. A ratio of the electric field strength E1 to the own repulsion due to the charge determines a lattice spacing of the nanoparticles.
  • the crystal structure thus formed has characteristics of a photonic crystal. In these, for some wavelengths, propagation is only along certain
  • Repulsive force between the similarly charged nanoparticles receives a different ratio. This changes the crystal structure so that a blue component is now reflected, for example, from the white light of a black body radiator, so that the microcapsule provides a blue color impression.
  • FIGS. 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 blackbody beam, a red color component is reflected. When the field strength is increased, the distance between the particles in the crystal lattice decreases, so that now a green color component is reflected. If the field strength is further increased (FIG. 2c), the grid spacing becomes even smaller, so that again a blue color component is reflected again.
  • FIG. 3 again shows another embodiment of microcapsules 10. In this embodiment, the substance in the microcapsule 10 at different
  • FIGS. 3a to 3f The embodiment of FIGS. 3a to 3f is described for a substance having a temperature-dependent phase transition. Using a magnetorheological fluid as a substance, one obtains an analogous behavior.
  • the behavior described in connection with FIGS. 3d to 3f shows such an embodiment when the physical quantity of temperature, the magnetic field strength, is used, wherein a magnetic-field-free or magnetic-field-free state corresponds to the situation in which the temperature lies above the melting temperature.
  • the situation of FIGS. 3a to 3c occurs when a sufficiently high magnetic field is applied, so that the viscosity of the substance in the microcapsules is greatly increased.
  • FIGS. 4a to 4d Four schematic views of an area of a security document are shown schematically in FIGS. 4a to 4d.
  • Fig. 4a a legend for the mediated color impressions is given, which applies to all Fig. 4a to 7f.
  • first information 21 and second information 22 are printed.
  • the first information 21 and the second information 22 are printed.
  • the second printing information exemplarily forms the letter "A".
  • the remaining area of the area 20 is through the first
  • a structured ink which comprises microcapsules similar to those of Fig. 1a.
  • the second printing information can be recognized by the fact that the corresponding printed area is colorless or transparent.
  • the first printing information has, for example, a red color impression.
  • a crystal structure is formed from the colloidal particles in the microcapsules, so that they also reflect red light. In this state, the first print information and the second
  • the weak field strength is first set to determine if a uniform area is created in which no first and second areas are perceptible due to the color. This is the case in the example illustrated in FIG. 4b.
  • FIG. 4c or 4d the electric field strength is changed and further images are detected, which are shown schematically in FIG. 4c or 4d. If you look for areas that have not changed their color, these are the first areas 23, which are still red. In addition, second areas 24 occur, which form the letter "A", which in FIGS. 4c and 4e has a different color impression have the same areas in Fig. 4b. If this deviation is detected, this can be used for verification.
  • Verification decision to be made If another letter, for example the letter "B” is expected, but the letter “A” is derived, this would lead to a negative verification decision.
  • FIGS. 5a to 5d Shown are the views of one area of a security document for different field strengths. This embodiment differs from that according to FIGS. 4a to 4d in that the entire area 20 is printed over the entire area with the first printing information 21 and the second printing information, which again covers an area which represents a capital letter "A", is printed above it.
  • microcapsules are included which are similar to those of Fig. 1 a to 1 c. In the field-free space, therefore, the printing ink with the microcapsules is almost transparent, so that the uniform homogeneous color impression is caused solely by the first printing information. Under the given environmental conditions, the structure color then assumes the same color impression as the first print information. This is shown in Fig. 5b. If the field strength is further increased, color variations of the second green-and-blue regions 24 printed with the second printing information 22 occur, as shown in Figs. 5c and 5d.
  • FIGS. 6a to 6d A further embodiment is shown in FIGS. 6a to 6d. At this point
  • the second printing information 22 which is printed with the structure color already in the field-free space, the structure color red, which is selected to be identical to the body color of the first printing information 21.
  • the field-free space again results in a homogeneous uniform color impression for the entire area 20. If the field strength increases, occurs in those areas 24 which are printed with the second printing information 22 and corresponding ink, which has a structural color, the letter "A" in different colors over green to blue.
  • second regions 24 are detected which have a different color impression in the respective image relative to the corresponding color impression in FIG.
  • FIGS. 7a to 7e show an embodiment in which the printing ink, which has a structural color, is similar to the microcapsules as shown in FIG.
  • the verification can additionally include a check whether at a temperature below a melting temperature, despite changing the electric field, no color change can be seen, above the melting temperature, however, the color change occurs when changing the electric field.
  • Temperature occurs in each case the electric field strength for an electrorheological fluid and the magnetic field strength for a magnetorheological fluid, wherein in each case a low field strength corresponds to the temperature above the melting temperature and a high field strength with the low temperature below the melting temperature.
  • a magnetic field and a magnetorheological fluid an electric field analogous to the above-described case of a substance with a temperature-dependent
  • Fig. 8 is an exploded view of a security document is shown schematically.
  • 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 transparent in order to be able to recognize the first printing information 21 and the second printing information 22 in the area 20, 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 printing information 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 on the uppermost through the various substrate layers with contacts 51, 52
  • Substrate layer 31 contacted 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 region 20.
  • a current is passed through the conductor loop 55, a magnetic field is created in the region of the region 20.
  • particles which are paramagnetic can be aligned to a crystal structure similar to charged particles via an electric field.
  • the uppermost and lowermost substrate layers 31, 35 serve essentially as
  • All substrate layers 31, 35 are preferably over
  • FIG. 9 a shows a plan view of the security document 30 in the field-free space.
  • the second pressure information 22 is in a circular structure. This can not be recognized because the structure color in the field-free space has the same color impression as the pigment color, with the first Print information 21 is printed in the rest of the area 20. On the other hand, if a voltage is applied to the electrodes 41, 42, then in the region 20 between the
  • Electrodes 41, 41 an electric field. This changes the crystal structure of the second printing information and changes its color.
  • the second region 24 (the circle) clearly protrudes from the first region 23 in which the pigment color is printed. Verification of the security document is reliable and easy.
  • electrodes and a coil are present in the security document in order to provide a safety device
  • Embodiments only one of the two excitation options or none of these options include.
  • the electrical and / or magnetic field strength can also be produced in any other way, in a tester or simply by means of a magnet, etc.
  • the substance used is a magnetorheological fluid in which the colloidal particles are dispersed, crystal structure formation or change upon variation of the electric field can be observed only in the absence of a magnetic field.
  • a magnetic field is generated in the region 20, it finds
  • Printing ink is formed, which has only pigments, which have a body color.
  • the individual embodiments can, however, also be configured analogously so that the first printing information is or is formed with a further structure color which has the same color impression as the one structure color with which the second printing information is printed under the given ambient conditions but with a change in the Environmental conditions shows a color change of the color change of a structure color is different. Deviations of these alternative embodiments occur only in the sense that the first areas in the further illustration and, if necessary, if additional images are or are detected, have a color impression in the additional images which differs from the color impression in the one image. First and second areas can still be separated because they are the same

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

L'invention concerne un document de sécurité (30) comprenant une région (20), dans laquelle sont stockées une première information d'impression (21) et une deuxième information d'impression (22) qui donnent une impression de couleur identique dans des conditions d'environnement prescrites de sorte que, dans les conditions d'environnement prescrites, un impression de couleur uniforme et homogène est donnée dans la région (20) et de sorte que la première information d'impression (21) et la deuxième information d'impression (22) ne puissent être distinguées en raison de l'impression de couleur donnée. La première information d'impression (21) est formée au moyen de pigments de couleur mal imprimés qui ont une couleur de corps, et la deuxième information d'impression (22) est formée par une encre qui présente une structure de couleur dont l'impression de couleur donnée peut être modifiée par une excitation. En outre, l'invention concerne un procédé de vérification d'un document de sécurité (30) et un procédé pour sa production.
EP14809654.8A 2013-12-10 2014-12-10 Document de sécurité comportant une caractéristique de sécurité masquée Active EP3079919B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013225516.0A DE102013225516B4 (de) 2013-12-10 2013-12-10 Sicherheitsdokument mit verdecktem Sicherheitsmerkmal
PCT/EP2014/077288 WO2015086711A2 (fr) 2013-12-10 2014-12-10 Document de sécurité comportant une caractéristique de sécurité masquée

Publications (2)

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EP3079919A2 true EP3079919A2 (fr) 2016-10-19
EP3079919B1 EP3079919B1 (fr) 2019-09-11

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DE (1) DE102013225516B4 (fr)
WO (1) WO2015086711A2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10217632A1 (de) * 2002-04-19 2003-11-06 Giesecke & Devrient Gmbh Sicherheitsdokument
DE102007059550A1 (de) * 2007-12-11 2009-06-25 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
DE102009023982A1 (de) 2009-06-05 2010-12-09 Giesecke & Devrient Gmbh Sicherheitselement
DE102009024447A1 (de) * 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Sicherheitselement mit veränderbarem optischen Erscheinungsbild
DE102009025019A1 (de) 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Sicherheitsmerkmal und Verfahren zur Herstellung eines Sicherheitsmerkmals
KR100953578B1 (ko) 2009-08-05 2010-04-21 주식회사 나노브릭 광결정성을 이용한 인쇄 매체, 인쇄 방법 및 인쇄 장치

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DE102013225516B4 (de) 2018-09-06
DE102013225516A1 (de) 2015-06-11
WO2015086711A3 (fr) 2015-08-06
WO2015086711A2 (fr) 2015-06-18
EP3079919B1 (fr) 2019-09-11

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