EP3497679B1 - Procédé et dispositif d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité d'un produit de sécurité - Google Patents

Procédé et dispositif d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité d'un produit de sécurité Download PDF

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Publication number
EP3497679B1
EP3497679B1 EP17749720.3A EP17749720A EP3497679B1 EP 3497679 B1 EP3497679 B1 EP 3497679B1 EP 17749720 A EP17749720 A EP 17749720A EP 3497679 B1 EP3497679 B1 EP 3497679B1
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EP
European Patent Office
Prior art keywords
substance
security
radiation
irradiation
security feature
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EP17749720.3A
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German (de)
English (en)
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EP3497679A1 (fr
Inventor
Lazar KULIKOVSKY
Olga Kulikovska
Ilya Komarov
Detlef Starick
Manfred Paeschke
Andre JOSEPH
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Bundesdruckerei GmbH
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Bundesdruckerei GmbH
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    • 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
    • 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
    • G07D7/003—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 security elements
    • 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

Definitions

  • the invention relates to a method and a device for identifying at least one security element of at least one security feature of a security product.
  • Security products such as valuables and/or security documents are usually equipped with security features that can consist of various security elements. These security features make it more difficult or prevent counterfeiting of these products. Furthermore, the security features or security elements used therein can be used to verify or authenticate the security product.
  • Valuable and/or security documents can be, for example, banknotes, checks, credit cards, stocks, passports, identification documents, driving licenses, entrance tickets, tokens or the like.
  • Security products are preferably provided with various security features, each of which can be assigned to different security levels. It can be advantageous here if several security elements are put together in or into a security feature in such a way that they have different security levels for verification or authentication in such a way that the same security element can be assigned to several security levels at the same time.
  • Substances with electroluminescent properties can generally be understood to mean those powdery materials which, when excited with an alternating electric field, emit radiation preferably in the visible region of the optical spectrum. If electroluminescent substances are used, in particular to protect against counterfeiting of security products, powdery, zinc sulfide electroluminophores are preferably used. These can be printed on or in the matrix of the respective security products using standard printing technology, for example gravure printing, offset printing or screen printing processes to be ordered. The safety products can consist of paper, plastic, but also other suitable materials. The electroluminophores provided in this way can then be excited, preferably in a contactless manner, with an alternating electrical field. This is in the EP 0 964 791 B1 described.
  • Such electroluminescent security elements can form a so-called Level 3 feature. This means that they have a very high level of security. Proof of authenticity of corresponding security documents involves a comparatively high level of effort and high demands on the detection technology used. This applies both to stationary testing and in particular to the non-stationary high-speed detection of electroluminescence signals, which is the aim in numerous applications.
  • electroluminescent security elements When using electroluminescent security elements, it has proven to be advantageous to combine the electroluminescent pigments used with so-called field displacement elements and to arrange this combination, for example in the form of a pigment mixture, on or in the security product. This is for example in the EP 1 631 461 B1 and in the EP 1 748 903 B1 described.
  • the field displacement elements can, for example, be designed as transparent or semi-transparent dielectric or electrically conductive pigments or include such pigments.
  • the dielectric pigments have a comparatively high permittivity, for example a permittivity greater than 100, in order to be able to effectively displace the electric field. In an initial state, such dielectric pigments are not electrically conductive or are only electrically conductive to a very small extent ( ⁇ ⁇ 10 -7 S/m).
  • the field displacement elements can also be designed as conductive pigments with comparatively low electrical conductivity or can include such pigments. Electrically conductive field displacement elements have an electrical conductivity in the range of 10 -3 -10 -2 S/m.
  • the field displacement elements can cause an amplification or concentration of the local alternating electric fields effective on the surface of the electroluminescent elements and thus an increase in the intensity of the electroluminescence radiation emitted due to the field-induced excitation. They can do this Electrically conductive particles cause significantly higher amplification of the local field compared to dielectric particles.
  • optically variable effect pigments in particular so-called multilayer effect pigments, as field displacement elements, which, in addition to the explained amplification of the local electric field, can also generate verifiable optical effects, in particular interference effects.
  • These effect pigments can preferably contain at least some metal oxide layers, such as those made of titanium oxide.
  • the resulting security feature can also have a corresponding level 1 characteristic in addition to its level 3 characteristic.
  • the optical effect which can consist of a color or gloss change that is perceptible to the viewer at different lighting and/or viewing angles, can also be evaluated as an additional criterion for authenticity verification.
  • the disadvantage is that when using the security features described in valuable and/or security documents, despite the presence of field displacement elements, comparatively extremely high excitation voltages are required in order to generate a sufficiently strong local alternating electric field, which is sufficient to efficiently excite the electroluminescence and thus also ensuring reliable detection of the corresponding electroluminescence signal.
  • This is due, among other things, to the extremely special and unconventional arrangement of the electroluminescent elements in the valuable and/or security documents compared to the conventional technical application of electroluminophores in electroluminescent films with classic capacitor construction, as well as to the contactless excitation with an alternating electric field, particularly in the case of high-speed detection of the electroluminescent signals and the also preferably contactless detection of these signals.
  • High-voltage alternating fields are therefore required in order to be able to operate under the circumstances described powdery zinc sulfide pigments to stimulate electroluminescence and to ensure a sufficiently high signal strength.
  • security features especially those based on luminescence phenomena, are exposed to numerous aging processes during the period of their use. These can be caused, for example, by intense sunlight, dirt, mechanical abrasion, contact with water or organic solvents and by numerous other influencing factors. Therefore, when checking the authenticity of security and valuable documents in circulation with an electroluminescent security feature, it can be assumed that the signal strengths of electroluminescence resulting from constant excitation conditions will become increasingly lower over the life cycle of the security and valuable documents.
  • the level of the excitation voltage is limited by the dielectric strength (against voltage breakdown, arc, sparks) of the surrounding medium. In the case of air as the ambient medium, this means that the electric field generated by the excitation voltage must not exceed values of 3.3 V/ ⁇ m. Excessively high voltage thus disadvantageously reduces operational reliability due to possible breakdowns.
  • the DE 10 2008 034 022 A1 which includes the preamble of claims 1 and 8, discloses a method for producing a security and/or valuable product, in particular a security and/or valuable document, with the following method steps: a substrate is coated with a marking layer containing a luminescent substance, from a A character string is formed by the pattern formed by the luminescence emission of the luminescent substance, and the character string is legibly applied to the security and/or valuable product as an identification character string and/or readably integrated therein.
  • the WO 2015/024619 A1 discloses a printed image on a substrate, in particular a printed image which contains platelet-shaped effect pigments and shows striking matt-gloss effects.
  • the WO 2015/091237 A1 discloses a powdery, zinc sulfide phosphor which, as an electroluminophore, can be excited by an electric field and also has special luminescence properties.
  • the DE 197 08 543 A1 discloses security documents with graphically designed security features, preferably in gravure printing, which can be made to glow in the form of dots, lines and/or areas, with wavelengths in the invisible UV range up to the range of typically 360 to the human eye 780 nm but also in the infrared range can be aimed for and implemented.
  • the technical problem therefore arises of creating a method and a device for identifying at least one security element of at least one security feature of a security product, which, with sufficient operational reliability, enables a more reliable identification of the security element over the entire life cycle of the security product, in particular identification with low excitation voltages or when using a substance with electroluminescent properties in low concentration.
  • the basic idea is particularly suitable for a security feature which consists at least partially of a mixture of powdered electroluminophores and optically variable effect pigments.
  • What is proposed is a method for identifying at least one security element of at least one security feature of a security product.
  • a security element refers to a substance.
  • the security feature includes substances.
  • the security product can in particular be a valuable or security document.
  • Any document that is a physical entity that is protected against unauthorized production and/or falsification by security features can be referred to as a security document.
  • Security features are features that make falsification and/or duplication at least more difficult than simple copying. Security elements can therefore designate physical entities that form a security feature.
  • a security document can include multiple security features and/or multiple security elements.
  • Value documents are documents that represent value. Documents of value can also be security documents. Examples of security documents, which also include documents of value, include, for example, passports, identity cards, driving licenses, identity cards, access control cards, health insurance cards, banknotes, postage stamps, bank cards, credit cards, smart cards, tickets and labels.
  • the security feature can in particular be a machine-readable security feature.
  • the security feature or security elements of the security feature can be arranged at least partially or completely on a surface of the security product or in the security product.
  • identification also includes detection of the security element.
  • An identification can therefore mean that it is detected whether the security element is present in the security feature or in the security product or whether the security feature is present in the security product or not.
  • Identification can also mean that it is detected whether or not the at least one security element is contained in the security feature or product to a predetermined extent, for example in a predetermined amount or concentration.
  • the security feature includes at least a first substance with electroluminescent properties.
  • This first substance can therefore be a first security element of the security feature.
  • the first substance can in particular be a powdery substance or a substance that can be provided in powder form.
  • the first substance is preferably powdery, zinc sulfide electroluminescent materials, which can also be referred to as electroluminescent pigments or electroluminophores. After excitation in an alternating electric field, the first substance emits luminescent radiation, in particular luminescent radiation with wavelengths in the visible range of the optical spectrum.
  • Electroluminescent materials suitable for the first substance are in the publications mentioned at the beginning, in particular in EP 1 151 057 B1 , the DE 10 2013 114 496 A1 as well as in the printed matter EP 1 631 461 B1 as well as EP 1 748 903 B1 described. Reference is therefore made in full to the disclosure content of these publications regarding the electroluminescent substance.
  • the security feature further includes at least one further substance. In combination with the first substance, this causes an increase in the local electric field effective on the surface of the first substance when the alternating electric field is applied and thus an increase in the signal strength of the emitted electroluminescent radiation.
  • This further substance can also be a further security element of the security feature.
  • the security feature consisting at least of the first and further substances can be applied to the entire or partial area of the security product. This can be done, for example, using a printing ink that consists of at least the first and the further substance in a common printing process.
  • the further substance is a substance with an electrical conductivity that can be changed, namely increased, by high-energy irradiation.
  • the high-energy irradiation can be carried out with radiation whose maximum wavelength is smaller than the minimum wavelength of visible light, i.e. in particular smaller than 400 nm.
  • the high-energy radiation is UV radiation. Radiation with wavelengths from a wavelength range of 5 nm to 380 nm, preferably from a wavelength range of 100 nm to 380 nm, can be used here. In the following, the high-energy radiation is therefore also referred to as UV radiation.
  • the further substance can have a conductivity of an undoped semiconductor element, i.e. a rather low conductivity.
  • the further substance is preferably a dielectric substance, i.e. a substance with a dielectric constant greater than 10, preferably greater than 100.
  • the further substance can preferably be transparent or semi-transparent with respect to the electroluminescent radiation emitted by the first substance. This means that the further substance is transparent to the electroluminescent radiation or that this radiation does not attenuate more than a predetermined level, for example not more than 50%, preferably not more than 10%.
  • the further substance is a non-electroluminescent substance.
  • the further substance preferably consists of a substrate acting as a carrier material, which consists of different transparent or semi-transparent materials, for example synthetic or natural mica, SiO2, glass or other materials, as well as at least one transparent or semi-transparent metal oxide layer, which preferably consists of titanium oxide layer (TiO2 layer).
  • the metal oxide layer can be a layer whose electrical conductivity can be changed induced by radiation.
  • the security feature consisting of a combination of at least one electroluminescent security element and another security element with variable electrical conductivity is irradiated with high-energy radiation, namely UV radiation.
  • the security feature can be arranged in an irradiation area of a device for generating this irradiation. The irradiation can take place at a fixed intensity for a predetermined period of time.
  • UV irradiation is preferably carried out at wavelengths that are smaller than 400 nm. Irradiation with UV irradiation devices that emit radiation in the so-called UV-A range, for example in the range of 365 nm. Both UV discharge lamps and UV LEDs can be used as irradiation devices.
  • the security feature is subjected to an alternating electrical field.
  • the alternating electric field can be generated by applying an excitation voltage to a means for generating the alternating field, for example at least one electrode.
  • the security feature can be arranged in an exposure area of a device for generating the alternating electric field.
  • the application of the alternating electric field serves to excite electroluminescent radiation.
  • an electroluminescence radiation emitted by the first substance, which is emitted during and/or after exposure to the alternating electric field is detected.
  • the electroluminescent radiation can be detected in particular using a device for detecting radiation.
  • the UV irradiation leads to an increase in the conductivity of the metal oxide layer and thus causes an increase in the local electric excitation field in the area of electroluminescent pigments.
  • This increases the intensity of the electroluminescence radiation, especially if powdery zinc sulfide electroluminophores are used as the first substance.
  • the radiation-related increase in the intensity of the electroluminescent radiation depends in particular on the irradiation dose, i.e. on the radiation energy and the duration of the UV irradiation.
  • the electrical conductivity of the further substance and thus the intensity of the electroluminescent radiation can increase in proportion to the irradiation dose or to the irradiation energy.
  • the electroluminescence intensity can increase by approximately 30% if the irradiation energy is 4 mJ or increase by approximately 85% if the irradiation energy is 18 mJ.
  • the effect mentioned can be exploited in an advantageous manner for simpler and more reliable identification of the first substance and/or the further substance.
  • it leads to a stronger measurement signal, which enables more reliable identification of the electroluminescence and/or a reduction in the excitation voltage.
  • proof of authenticity can also be secured for those valuable and security documents with electroluminescent security features that have been exposed to various aging processes over the course of their life cycle that impair the signal strength of the electroluminescence.
  • a further option may also consist of reducing the concentration of the first substance in the security feature.
  • the electrical conductivity of the additional substance can decrease again after UV irradiation has ended.
  • the reduction of the electrical conductivity to the initial level before UV irradiation can take place in a predetermined period of time, for example a period of up to 10-15 minutes.
  • the effect of increasing electrical conductivity through UV irradiation is therefore a reversible effect. After the electrical conductivity has been reduced, it can be increased again by further irradiation.
  • the first substance and/or the further substance is identified, in particular detected.
  • the property can in particular have an intensity of electroluminescent radiation.
  • the property can then be determined using an evaluation device.
  • the evaluation device also carries out the identification.
  • the first substance can be identified if at least one property-dependent criterion is met, for example if the intensity of the electroluminescent radiation is higher than a first predetermined threshold value. Otherwise the first substance cannot be identified.
  • the further substance or a component of the further substance, in particular TiO2 can be identified if at least one further property-dependent criterion is met, for example if the intensity of the electroluminescent radiation is higher than a further predetermined threshold value. Otherwise the other substance cannot be identified.
  • the further threshold value can be different from the first threshold value, in particular higher than this.
  • the first or the further substance can be identified depending on a change in properties, in particular a change in the intensity of the electroluminescent radiation.
  • the change in property can be an increase or decrease in the intensity of the electroluminescence depending on the intensity and duration of the UV irradiation.
  • the security feature can be subjected to an alternating electrical field before UV irradiation.
  • the intensity of the electroluminescent radiation can then be determined without prior UV irradiation.
  • the security feature can then be irradiated.
  • the security feature can be subjected to the alternating electric field again, preferably with the same field strength.
  • the intensity of the electroluminescence radiation can then be determined with previous UV irradiation.
  • the further substance can be identified if the intensity with previous UV irradiation is greater, in particular more than a predetermined amount greater, than the intensity without previous UV irradiation. Otherwise the further substance can cannot be identified.
  • This change can therefore be substance type-specific, in particular material or material composition-specific. It may therefore be possible to determine a type of further substance or at least several possible types of further substances depending on the change in intensity of the electroluminescent radiation.
  • the security feature can also be identified, in particular detected, depending on the at least one property of the electroluminescent radiation.
  • the method described can be used to verify or authenticate the security feature.
  • the security feature can be verified if the first and/or the further substance has been identified.
  • the security feature can be verified if at least one criterion, which depends on the property of the electroluminescent radiation, is met.
  • the security feature can be verified if the intensity is higher than a predetermined threshold value.
  • the security feature cannot be verified.
  • the strength of the electrical excitation field in the area of the substance with electroluminescent properties can be increased, which in turn increases the intensity of the emitted electroluminescent radiation.
  • this means that the electroluminescence radiation is increased by the previous UV irradiation (amplification effect).
  • This amplification effect can be maintained for a predetermined period of time even after UV irradiation has ended.
  • the use of the combination of the two substances described advantageously results in the generation of electroluminescent radiation with comparatively low excitation voltages. This enables energy-saving but also reliable identification and ensures sufficient operational safety due to the reduction in the risk of puncture.
  • the electroluminescent radiation for identification can also be generated reliably over the entire life cycle of the security feature.
  • the security feature is irradiated with UV radiation before it is exposed to the alternating electric field.
  • the UV irradiation begins before exposure to the alternating electric field.
  • the security feature is only exposed to the alternating electrical field after the UV irradiation has ended.
  • the start of exposure to the alternating electric field can take place with a time duration of less than 1 second after the end of the UV irradiation.
  • the electroluminescent radiation generated due to exposure to the alternating electric field is only detected after the UV irradiation has ended, since the UV irradiation can additionally generate undesirable photoluminescent radiation of the first substance.
  • a period of time between the end of the UV irradiation and the start of exposure to the alternating electric field is longer than 0 seconds. Alternatively or cumulatively, the time period is shorter than 600 seconds.
  • the further substance comprises at least one effect pigment.
  • the further substance can comprise a large number of effect pigments.
  • the effect provided by the additional substance can also or additionally be used to verify the security feature and thus the security product. This advantageously increases the reliability of the verification.
  • the further substance has at least a portion of a metal oxide layer.
  • This layer preferably consists at least partially of titanium dioxide.
  • other metal oxides can also be used.
  • the metal oxide consists at least partially of TiO 2 .
  • Layers consisting of TiO 2 or other metal oxides exhibit an increase in electrical conductivity when irradiated with high-energy radiation, in particular with UV radiation, and thus lead to a significant increase in electroluminescent radiation.
  • a further substance consists of a desired material, in particular a metal oxide, particularly TiO 2 .
  • At least one effect generated by the effect pigment is detected depending on at least one property of the electroluminescent radiation.
  • the effect pigment is further identified depending on the effect created.
  • the effect pigment can be identified, in particular in addition to depending on the property of the electroluminescent radiation, depending on an effect generated by the effect pigment.
  • the effect can in particular be one of the optical effects explained above.
  • the security feature can be illuminated at different illumination angles, in particular with radiation of a predetermined wavelength, radiation from a predetermined wavelength range or with radiation from different wavelength ranges.
  • the radiation reflected or emitted by the security feature under the illumination can be detected at different detection angles or viewed at different viewing angles.
  • the security feature can be verified. If the effect pigment or a predetermined type of effect pigment cannot be identified, the security feature cannot be verified.
  • the further substance can only be identified if the property and/or the increase in the electroluminescent radiation and/or if the effect generated can be assigned to the further substance.
  • a device for identifying at least one component, in particular a substance, of at least one security feature of a security product is also proposed.
  • the device is used to carry out a method according to one of the embodiments described in this disclosure.
  • the device is therefore designed in such a way that the corresponding method can be carried out using the device.
  • the device comprises at least one device for generating high-energy radiation, namely UV radiation, at least one device for generating an alternating electric field, at least one device for detecting electroluminescent radiation and at least one evaluation device.
  • the device for generating high-energy radiation is in particular a device for generating UV radiation. This can in particular be designed as a UV discharge lamp, as a UV LED or as a high-performance UV LED.
  • the at least one security feature can be irradiated, namely by the device for generating UV radiation.
  • the security feature can be acted upon by an alternating electrical field, in particular by a device for generating an alternating electrical field.
  • the device for generating an alternating electric field can be designed as an electrode or comprise at least one electrode.
  • electroluminescent radiation emitted by the first substance can be detected, in particular by the device for detecting electroluminescent radiation.
  • the device for detecting electroluminescence radiation can be, for example, a photodetector, a spectrometer or an image capture device. In addition to the suitable sensors, this or the device can also have suitable filter elements.
  • the first and/or the further substance of the security feature can be identified, namely by the evaluation device, depending on at least one property of the electroluminescent radiation.
  • the evaluation device can record the property of the electroluminescent radiation. This was explained previously.
  • an irradiation area of the at least one device for generating UV radiation is from an exposure area of the at least one device for generating the alternating electric field different. This can mean that there is a spatial distance between the UV irradiation area and the exposure area.
  • the security feature can be transported from the UV irradiation area into the exposure area, for example by means of a transport device.
  • the device can include the transport device.
  • the UV irradiation area can be arranged in front of the exposure area in the transport direction.
  • the parameters of the UV irradiation in particular a time period, an irradiation energy and/or an irradiation direction of the irradiation, can be adjusted such that during transport through the UV irradiation area the irradiation dose is sufficient to achieve a desired electroluminescence intensity or a desired electroluminescence intensity change subsequent exposure to the alternating electric field.
  • the device comprises at least one device for generating, detecting and evaluating an effect generated by an effect pigment.
  • the device can include several sub-devices, each of which can be used for generation, recording and/or evaluation.
  • the device can include a device for generating radiation from a predetermined wavelength range. The device for generating this radiation can be different from the device for generating radiation explained above.
  • the device can comprise a partial device for detecting the radiation reflected by the at least one effect pigment. This can be designed, for example, as an image capture device. This image capture device can be different from the device for detecting electroluminescent radiation or the same as this device.
  • the device can further comprise a device for evaluating or determining at least one property of the radiation reflected or emitted by the at least one effect pigment.
  • This evaluation device can be different from the previously explained evaluation device for evaluating the property of the electroluminescent radiation or the same as this device.
  • FIG. 1 is a schematic block diagram of a device 1 for identifying at least one component of a security feature 2 of a security document 3.
  • the security document 3 forms a security certificate.
  • the security document 3 lies on a support surface 4.
  • the device 1 includes a device 5 for generating UV radiation, a device 6 for generating an alternating electric field, a device 7 for detecting electroluminescent radiation and a control and evaluation device 8.
  • the control and evaluation device 8 can be designed as a microcontroller or include one.
  • the device 5 for generating UV radiation can be designed as a UV LED.
  • the device 6 for generating an alternating electric field can be designed as an electrode or comprise at least one electrode.
  • the device 7 for detecting electroluminescent radiation can be designed, for example, as an image capture device, and in this case in particular as a CCD camera.
  • the device 6 for generating the alternating electric field and the device 7 for detecting electroluminescent radiation can preferably be arranged in such a way that the security document 3, in particular the security feature 2 of the security document 3, is arranged between these devices 6, 7.
  • the devices 5, 6, 7 can thus be arranged on different pages of the security document 3, with at least two of the devices 5, 6, 7 being able to be arranged on one side of the security document 3. However, this is not mandatory. All devices 5, 6, 7 can also be arranged on the same page of the security document 3. It is important that the electroluminescence radiation generated by the security feature 2 when exposed to the alternating electric field generated by the device 6 can be detected by the device 7. It is also important that the UV irradiation occurs from the side of the security document 3 on which the security feature 2 is arranged.
  • the security feature 2 includes a first substance, not shown, with electroluminescent properties and at least one further substance, the electrical conductivity of the further substance being changeable by UV irradiation.
  • the first substance is in particular a powdery zinc sulfide electroluminophore.
  • the further substance includes in particular optical effect pigments, in particular mica pigments coated with titanium dioxide.
  • the device 5 for generating UV radiation, the device 6 for generating an alternating electric field and the device 7 for detecting electroluminescent radiation are arranged and/or designed in such a way that a security feature 2 is, if possible, simultaneously with UV radiation irradiated and subjected to an alternating electric field and the electroluminescent radiation can be detected.
  • the security feature 2 can be irradiated with UV radiation by the device 5 for generating UV radiation. After the start of irradiation with UV radiation, the security feature 2 can be acted upon by the device 6 for generating an alternating electric field with an alternating field, which can also be referred to as an excitation field.
  • the electroluminescence radiation generated due to the excitation field can be detected after the UV irradiation has ended. In particular, the application of an alternating electric field can also take place after the UV irradiation has ended.
  • the security feature 2 is excited with the alternating electric field, the first substance emits electroluminescent radiation, which is detected by the device 7 for detecting this electroluminescent radiation.
  • the control and evaluation device 8 can determine a property, in particular an intensity, of this electroluminescent radiation.
  • the security feature includes the first substance. For example, this can be identified when the intensity is greater than a first predetermined (low) threshold value.
  • the security feature 2 includes the additional substance.
  • the further substance can be identified if the intensity is higher than a further predetermined threshold value, the further predetermined threshold value being higher than the first predetermined threshold value.
  • the further predetermined threshold value can here be dependent on the strength of the alternating electric field. For a certain strength of the alternating electric field, the intensity of the electroluminescent radiation will be higher in the case in which the security feature 2 includes the further substance than in the case in which the security feature 2 does not include the further substance.
  • a type of further substance in particular a material or a material composition, can also be determined.
  • the electrical conductivity and thus the intensity of the electroluminescent radiation can change in various ways, in particular under and/or after UV irradiation.
  • the method described can be used to verify the security feature 2 and thus the security document 3.
  • the security feature 2 can be verified when both the first substance and the further substance have been identified.
  • the security feature 2 can only be identified if a predetermined type of further substance has been identified.
  • Fig. 2 shows a schematic block diagram of a device 1 according to the invention in a further embodiment.
  • the device 5 for generating UV radiation the device 6 for generating an alternating electric field and the device 7 for detecting the electroluminescent radiation are arranged in such a way that the irradiation area of the device 5 does not overlap with the exposure area of the device 6.
  • the security document 3 with the security feature 2 is transported by the device 5 into the exposure area of the device 6, for example by means of a transport device, not shown.
  • the support surface 4 can be the surface of a conveyor belt.
  • FIG. 3 a schematic flowchart of an identification method according to the invention is shown.
  • a security feature 2 (see e.g Fig. 1 ), which comprises a first substance with electroluminescent properties and at least one further substance, the further substance being changeable by UV irradiation has electrical conductivity, an alternating electrical field is applied in a first step S1 and the intensity of the emitted electroluminescence radiation is recorded (Signal1).
  • a second step S2 the security feature 2 is irradiated for a predetermined period of time with UV irradiation of a predetermined radiation energy, i.e. with a predetermined UV dose.
  • a third step S3 the security feature 2 is again subjected to the same alternating electrical field as in the first step S1 and the intensity of the emitted electroluminescent radiation is detected again (signal 2).
  • a fourth step S4 the ratio between the intensities (Signal2/Signal1) detected in the third step S3 and the first step S1 is determined and compared with a predetermined ratio. If the ratio is greater than a predetermined threshold value, the further substance is identified, the threshold value being greater than one. This was explained previously. Furthermore, the first substance can also be identified in the fourth step if the intensity determined in the third step is greater than a predetermined threshold value.
  • Fig. 4 shows a schematic cross section through a security feature 2 of a security document 3.
  • the security feature 2 is arranged on a paper layer 9 of the security document 3.
  • a device 6 for generating an electric field Also shown is a glass plate 10 under which two electrodes 11 are arranged, with epoxy resin 12 being arranged in a space between the electrodes 11 under the glass plate 10.
  • Air 13 is arranged between the paper layer 9 and the glass plate 10.
  • the security feature 2 comprises electroluminescent pigments 14 as a first substance and optical effect pigments 15 as a further substance.
  • the electroluminescent pigments 14 are pigments 14 of a powdery, zinc sulfide electroluminophore.
  • the optical effect pigments 15 are mica-based pigments that are coated with a TiO2 layer.
  • An excitation field can be generated by the electrode 11, which in turn leads to the emission of electroluminescent radiation. This electroluminescence radiation can then be detected, as explained above.
  • Figure 5 shows a schematic representation of the electroluminescence intensity as a function of the UV irradiation dose for two security features according to the invention with different mixing ratios of the first and the further substance
  • the detected electroluminescence intensities after UV irradiation of a security feature which comprises the first substance and the further substance in a first mixing ratio, are represented by circles.
  • the irradiation dose is shown on the abscissa, while the height of the recorded electroluminescence intensities is shown on the ordinate.
  • the rectangles represent the recorded electroluminescence intensities after UV irradiation of a security feature which includes the first substance and the further substance in a further mixing ratio.
  • the further mixing ratio is different from the first mixing ratio.
  • the recorded electroluminescence intensity at the same irradiation dose is very dependent on the specific composition of the security feature, i.e., among other things, on the mixing ratio of the combined electroluminescent pigments and the field displacement elements with variable conductivity. Furthermore, it can be seen that the electroluminescence intensity increases with increasing irradiation dose in both cases, with the increase having an approximately logarithmic increase and thus saturation occurs at irradiation doses above a predetermined limit value.
  • Fig. 6 shows a schematic representation of the increase in electroluminescence intensity as a function of the irradiation dose after UV irradiation of a security feature, which includes both the first and the further substance. It can be seen that the electroluminescence intensity increases with increasing irradiation dose, the increase having an approximately logarithmic course and thus the explained saturation of the recorded intensity is achieved.
  • Fig. 7 shows a schematic representation of the reduction in electroluminescence intensity after UV irradiation has ended. This shows that after UV irradiation with an energy of 45 mJ, the electroluminescence intensity has returned to the initial level before irradiation after more than 800 seconds, which is shown by a solid line.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Electroluminescent Light Sources (AREA)

Claims (10)

  1. Procédé d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité (2) d'un produit de sécurité, la caractéristique de sécurité (2) comprend une première substance et au moins une autre substance, la première substance étant une substance électroluminescente, l'autre substance étant une substance ayant une conductivité électrique modifiable par irradiation UV,
    caractérisé en ce que
    l'au moins une caractéristique de sécurité (2) est exposée à un rayonnement UV pour amplifier un rayonnement électroluminescent de la première substance, la caractéristique de sécurité (2) étant soumise à un champ électrique alternatif, un rayonnement électroluminescent émis par la première substance et amplifié par le rayonnement UV étant détecté, la première substance et/ou l'autre substance étant identifiées en fonction d'au moins une propriété du rayonnement électroluminescent amplifié.
  2. Procédé selon la revendication 1, caractérisé en ce que la caractéristique de sécurité (2) est irradiée avant d'être soumise au champ électrique alternatif.
  3. Procédé selon la revendication 2, caractérisé en ce qu'une durée entre la fin de l'irradiation et le début de l'exposition au champ électrique alternatif est supérieure à 0 secondes et/ou inférieure à 600 secondes.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'autre substance présente au moins en partie une couche d'oxyde métallique.
  5. Procédé selon la revendication 4, caractérisé en ce que l'oxyde métallique est constitué au moins en partie de Ti02.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'autre substance comprend au moins un pigment à effet.
  7. Procédé selon la revendication 6, caractérisé en ce qu'en plus de l'identification de la première et/ou de l'autre substance en fonction d'au moins une propriété du rayonnement électroluminescent, on détecte au moins un effet produit par le pigment à effet, le pigment à effet étant identifié en fonction de cet effet détecté.
  8. Dispositif d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité (2) d'un produit de sécurité, le dispositif (1) comprenant au moins un dispositif (5) de production de rayonnement UV, au moins un dispositif (6) de production d'un champ électrique alternatif, au moins un dispositif (7) de détection du rayonnement électroluminescent ainsi qu'au moins un dispositif d'évaluation (8),
    caractérisé en ce que l'au moins une caractéristique de sécurité (2) peut être exposée à un rayonnement UV pour amplifier un rayonnement électroluminescent de la première substance, la caractéristique de sécurité (2) pouvant être soumise à un champ électrique alternatif, un rayonnement électroluminescent émis par la première substance et amplifié par le rayonnement UV pouvant être détecté, le dispositif d'évaluation (8) étant conçu pour identifier la première et/ou l'autre substance en fonction d'au moins une propriété du rayonnement électroluminescent amplifié.
  9. Dispositif selon la revendication 8, caractérisé en ce qu'une zone d'irradiation de l'au moins un dispositif (5) de production de rayonnement UV est différente d'une zone d'application de l'au moins un dispositif (6) de production du champ électrique alternatif, la caractéristique de sécurité (2) pouvant être transportée de la zone d'irradiation à la zone d'application.
  10. Dispositif selon la revendication 8 ou 9, caractérisé en ce que le dispositif (1) comprend au moins un dispositif de génération, de détection et d'évaluation d'un effet généré par un pigment à effet.
EP17749720.3A 2016-08-11 2017-08-09 Procédé et dispositif d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité d'un produit de sécurité Active EP3497679B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016215002.2A DE102016215002A1 (de) 2016-08-11 2016-08-11 Verfahren und Vorrichtung zur Identifikation zumindest eines Sicherheitselementsmindestens eines Sicherheitsmerkmals eines Sicherheitserzeugnisses
PCT/EP2017/070199 WO2018029253A1 (fr) 2016-08-11 2017-08-09 Procédé et dispositif d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité d'un produit de sécurité

Publications (2)

Publication Number Publication Date
EP3497679A1 EP3497679A1 (fr) 2019-06-19
EP3497679B1 true EP3497679B1 (fr) 2023-09-27

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EP17749720.3A Active EP3497679B1 (fr) 2016-08-11 2017-08-09 Procédé et dispositif d'identification d'au moins un élément de sécurité d'au moins une caractéristique de sécurité d'un produit de sécurité

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Country Link
EP (1) EP3497679B1 (fr)
DE (1) DE102016215002A1 (fr)
ES (1) ES2963296T3 (fr)
WO (1) WO2018029253A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19758587C2 (de) 1997-03-04 2003-03-27 Bundesdruckerei Gmbh Anordnung zur visuellen und maschinellen Echtheitsprüfung von Wert- und Sicherheitsdokumenten
DE19953924A1 (de) 1999-11-10 2001-06-07 Bundesdruckerei Gmbh Zinksulfidische Elektroluminophore sowie Verfahren zu ihrer Herstellung
DE10326644A1 (de) 2003-06-11 2005-01-13 Bundesdruckerei Gmbh Wertdokument mit einem Sicherheitselement und Verfahren zur Herstellung des Wertdokuments
DE102004025373A1 (de) 2004-05-24 2005-12-15 Merck Patent Gmbh Maschinenlesbares Sicherheitselement für Sicherheitserzeugnisse
DE102008034022A1 (de) * 2008-07-16 2010-01-21 Merck Patent Gmbh Verfahren zur Herstellung eines Sicherheits- und/oder Wertprodukts mit Teilbereichen mit unterschiedlicher Lumineszenzemission
DE102008034021A1 (de) 2008-07-16 2010-01-21 Merck Patent Gmbh Verfahren zur Herstellung eines Sicherheits- und/oder Wertprodukts mit Zufallsmuster und korrelierter Identzeichenfolge
ES2638817T3 (es) * 2013-08-23 2017-10-24 Merck Patent Gmbh Imagen impresa
DE102013114496A1 (de) * 2013-12-19 2015-06-25 Bundesdruckerei Gmbh Zinksulfidischer Leuchtstoff mit Photo- und Elektrolumineszenzverhalten, Verfahren zu dessen Herstellung sowie Sicherheitsdokument, Sicherheitsmerkmal und Verfahren zu dessen Detektion

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WO2018029253A1 (fr) 2018-02-15
EP3497679A1 (fr) 2019-06-19
ES2963296T3 (es) 2024-03-26
DE102016215002A1 (de) 2018-03-01

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