EP3497679A1 - Verfahren und vorrichtung zur identifikation zumindest eines sicherheitselements mindestens eines sicherheitsmerkmals eines sicherheitserzeugnisses - Google Patents
Verfahren und vorrichtung zur identifikation zumindest eines sicherheitselements mindestens eines sicherheitsmerkmals eines sicherheitserzeugnissesInfo
- Publication number
- EP3497679A1 EP3497679A1 EP17749720.3A EP17749720A EP3497679A1 EP 3497679 A1 EP3497679 A1 EP 3497679A1 EP 17749720 A EP17749720 A EP 17749720A EP 3497679 A1 EP3497679 A1 EP 3497679A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substance
- security
- radiation
- electroluminescent
- security feature
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 138
- 230000005855 radiation Effects 0.000 claims abstract description 122
- 230000005684 electric field Effects 0.000 claims abstract description 54
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 claims description 52
- 239000000049 pigment Substances 0.000 claims description 51
- 230000000694 effects Effects 0.000 claims description 46
- 238000011156 evaluation Methods 0.000 claims description 13
- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005401 electroluminescence Methods 0.000 description 29
- 230000005284 excitation Effects 0.000 description 25
- 238000001514 detection method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 9
- 229910010413 TiO 2 Inorganic materials 0.000 description 7
- 239000005083 Zinc sulfide Substances 0.000 description 7
- 238000012795 verification Methods 0.000 description 7
- 229910052984 zinc sulfide Inorganic materials 0.000 description 7
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 7
- 230000001419 dependent effect Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 238000004020 luminiscence type Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 231100000289 photo-effect Toxicity 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- G07D7/06—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 element
- Security products such as security and / or security documents, are typically equipped with security features that include various security features
- Security features or security elements used therein for verification or authentication of the security product can be used. Value and / or
- Security documents may be, for example, banknotes, checks, credit cards, stocks, passports, identity documents, driver's licenses, entrance tickets, tokens or the like.
- security products are provided with different security features, which can each be assigned to different security levels.
- substances having electroluminescent properties can generally be understood as meaning those powdery materials which emit radiation when excited by an alternating electric field, preferably in the visible region of the optical spectrum.
- electroluminescent substances in particular for protection against counterfeiting of security products, preferably powdery, zinc sulfide electroluminophores are used here. These can, with the help of conventional printing technology, for example gravure printing, offset printing or screen printing, on or in the matrix of the respective security products to be ordered.
- the security products can consist of paper, plastic, but also of other suitable materials. Subsequently, the thus provided Elektroluminophores can preferably be excited without contact with an alternating electric field. This is described in EP 0 964 791 B1.
- Such electroluminescent security elements can form a so-called Level-3 feature. This means that they have a very high level of security.
- the proof of authenticity of corresponding security documents is here with a
- electroluminescent security elements When using electroluminescent security elements, it has proved 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 described, for example, in EP 1 631 461 B1 and in EP 1 748 903 B1.
- the field displacement elements may e.g. be formed as transparent or semitransparent dielectric or electrically conductive pigments or include such pigments.
- the dielectric pigments have a comparatively high
- Dielectric constant for example, a dielectric constant greater than 100 in order to effectively displace the electric field can.
- dielectric pigments are not or only to a very limited extent electrically conductive in an initial state ( ⁇ ⁇ 10 -7 S / m).
- the field-displacement elements may also be conductive
- Pigments are formed with comparatively low electrical conductivity or include such pigments.
- Electrically conductive field displacement elements in this case 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 acting on the surface of the electroluminescent elements and thus an increase in the intensity of the electroluminescence radiation emitted as a result of the field-induced excitation.
- the can electrically conductive particles cause significantly higher gain of the local field compared to dielectric particles.
- optically variable effect pigments in particular so-called multi-layer effect pigments, which in addition to the explained amplification of the local electric field can additionally produce verifiable optical effects, in particular interference effects.
- effect pigments may preferably at least partially
- Metal oxide layers such as those of titanium oxide included.
- resulting security feature in addition to its level 3 characteristic also have a corresponding level 1 characteristic.
- level 3 characteristic namely, the optical effect, in a different lighting and / or
- Viewing angles for the viewer perceptible color or gloss change can be evaluated as an additional criterion for the authenticity verification.
- security features especially those based on luminescence phenomena, are exposed to numerous aging processes during their period of use. These can be caused, for example, by intense sunshine, dirt, mechanical abrasion, contact with water or organic solvents as well as numerous other influencing factors
- the height of the excitation voltage is limited by the dielectric strength (with respect to voltage breakdown, arc, sparking) of the surrounding medium.
- the dielectric strength with respect to voltage breakdown, arc, sparking
- Surrounding medium means that the electric field generated by the excitation voltage must not exceed values of 3.3 V / ⁇ . Too high voltage thus disadvantageously reduce operational safety due to possible breakdowns.
- 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.
- Proposed is a method for identifying at least one security element of at least one security feature of a security product.
- a security element can in this case designate a substance.
- the security feature may comprise a plurality of security elements, in particular a plurality of substances.
- the security product may in particular be a value or security document.
- a security document can be any document that has a
- Security features are in this case such features that complicate a falsification and / or duplication compared to a simple copy at least.
- Security elements can thus be physical entities that form a security feature.
- a security document may have multiple security features and / or multiple security features
- Value documents are documents that represent a value.
- Value documents can also be security documents.
- security documents which include documents of value include, for example, passports, identity cards, driving licenses, identity cards, access cards,
- Health insurance cards banknotes, postage stamps, bank cards, credit cards,
- the security feature may in particular be a machine-readable security feature.
- Security feature at least partially or completely on a surface of the security product or be arranged in the security product.
- identification also includes a detection of the security element.
- an identification may mean that it is detected whether the security element in the security feature or in the security product or whether the security feature is present in the security product or not.
- Identification may also mean that it is detected whether the at least one security element has a predetermined dimension, for example, in a predetermined quantity or
- the security feature comprises at least a first substance with
- This first substance can thus be a first security element of the security feature.
- the first substance may be a powdery substance or a powderable substance.
- the first substance is powdered, zinc sulfide electroluminescent, which also as electroluminescent or
- Electroluminophores can be referred to. After excitation in an alternating electric field, the first substance emits a luminescence radiation, in particular a luminescence radiation with wavelengths in the visible range of the optical spectrum.
- Electroluminescent materials which are suitable for the first substance are described in the publications cited initially, in particular in EP 1 151 057 B1, DE 10 2013 1 14 496 A1 and in the publications EP 1 631 461 B1 and EP 1 748 903 B1
- the security feature comprises at least one further substance.
- this causes an amplification of the local electric field acting on the surface of the first substance when exposed to the alternating electric field 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 existing at least from the first and further substance security feature can be applied to the security product over the entire area or partially. This can e.g. with the help of a printing ink, which consists of at least the first and the further substance, carried out in a common printing process.
- the further substance is a substance with an energy conductivity which can be changed by high-energy irradiation, in particular can be increased.
- the high-energy irradiation can be done with radiation whose maximum
- Wavelength is smaller than the minimum wavelength of visible light, ie in particular less than 400 nm.
- the high-energy irradiation denotes a UV irradiation. This can be radiation with wavelengths from a
- Wavelength range from 5 nm to 380 nm, preferably from a wavelength range of 100 nm to 380 nm, are used.
- the following is the high-energy
- UV irradiation therefore also called UV irradiation.
- the further substance may have a conductivity of an undoped semiconductor element, ie a rather low conductivity.
- the further substance is furthermore preferably a dielectric substance, that is to say a substance with a relative permittivity greater than 10, preferably greater than 100.
- the further substance may be relative to that emitted by the first substance
- Electroluminescent radiation preferably be transparent or semitransparent. This means that the further substance is permeable to the electroluminescent radiation or attenuates this radiation no more than a predetermined amount, for example not more than 50%, preferably not more than 10%.
- the further substance is a non-electroluminescent substance.
- the further substance consists of a substrate acting as a carrier material, which consists of different transparent or semi-transparent materials, for example of synthetic or natural mica, of SiO 2, glass or other materials can be formed as well as at least one transparent or semi-transparent metal oxide layer, which preferably consists of titanium oxide layer (TiO 2 layer).
- the metal oxide layer may be a layer whose electrical
- Conductivity is radiation-induced changeable.
- this consists of a combination of at least one
- the security feature can be arranged in an irradiation area of a device for generating this irradiation.
- the irradiation may be at a fixed intensity for a predetermined period of time.
- the irradiation in particular the UV irradiation, preferably takes place at wavelengths which are smaller than 400 nm.
- the irradiation is carried out with UV irradiation facilities, the radiation in the so-called UV-A range, ie
- Irradiation facilities are used both UV discharge lamps and UV LEDs.
- 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 a loading area of a device for generating the alternating electric field.
- the application of the alternating electric field serves to excite electroluminescent radiation.
- an electroluminescent radiation emitted by the first substance, which is emitted during and / or after exposure to the alternating electric field, is detected.
- the detection of the electroluminescent radiation can be carried out in particular with a device for detecting radiation.
- high-energy radiation in particular UV radiation
- Field displacement elements which are formed as optical effect pigments or include such effect pigments.
- Excitation field in the field of electroluminescent pigments causes. This increases the intensity of the electroluminescent radiation, in particular when powdery zinc sulfide electroluminophores are used as the first substance.
- the radiation-related increase in the intensity of the electroluminescent radiation here depends in particular on the irradiation dose, that is to say 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 proportionally to the irradiation dose or to the irradiation energy.
- the electroluminescence intensity may increase by about 30% when compared to an excitation without previous UV irradiation, when the irradiation energy is 4 mJ or about 85% when the
- Irradiation energy is 18 mJ.
- the said effect can advantageously for easier and safer
- Identification of the first substance and / or the further substance are exploited. In particular, it leads to a stronger measurement signal, which enables a more secure identification of the electroluminescence and / or a reduction of the excitation voltage. In this way, the proof of authenticity for such value and
- Security documents are secured with electroluminescent security features that have been exposed in the course of their life various types, the signal strength of the electroluminescence affecting aging processes.
- another option may be to reduce the concentration of the first substance in the security feature.
- Electroluminescence intensity it has been essential that both the electroluminescent substance and the field displacement elements are present in the security feature, in particular in a fixed mixing ratio. Furthermore, comparatively extremely high alternating voltages were necessary in order to achieve the required local field strength and thus the desired electroluminescence intensity.
- the UV irradiation according to the invention now makes it possible to achieve the same or a similar high electroluminescence intensity with a comparison of 15-25% lower excitation voltage. If the same excitation voltage is used, this results in a significant increase in the electroluminescence intensity, for example by more than 100%.
- the electrical conductivity of the further substance may decrease again after the end of the UV irradiation.
- the reduction of the electrical conductivity to the initial level before the UV irradiation can take place in a predetermined period of time, for example a time duration of 10-15 minutes.
- the effect of increasing the electrical conductivity by UV irradiation is thus a reversible effect.
- a renewed increase can be achieved by a renewed irradiation.
- the property may have an intensity be the electroluminescent radiation. The property can then by means of a
- the evaluation device can also perform the identification.
- the first substance may be identified if at least one property-dependent criterion is met, e.g. if the intensity of the
- Electroluminescent radiation is higher than a first predetermined threshold.
- the first substance can not be identified.
- the further substance or a constituent of the further substance, in particular TiO 2 can be identified, if at least one further
- property-dependent criterion is met, e.g. if the intensity of the
- Electroluminescent radiation is higher than another predetermined threshold.
- the further threshold value may be different from, in particular higher than, the first threshold value.
- the first or the further substance can, depending on a property change, in particular a change in intensity of the
- Electroluminescent radiation can be identified.
- the change in property may be a rise or fall 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 electric field in time before the UV irradiation. Then the intensity of the
- Electroluminescent radiation can be determined without previous UV irradiation. After that, the security feature can be irradiated. After the completion of this UV irradiation, the security feature can again be subjected to the alternating electric field, preferably with the same field strength. Then the intensity of the electroluminescent radiation can 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 predefined amount, greater than the intensity without preceding UV irradiation. Otherwise, the more substance can can not be identified.
- Pigments in the security feature introduced substance (substance type or type) with variable conductivity as a function of the intensity of the detected electroluminescence, or to identify their change.
- This change can therefore be substance-specific, in particular material or material composition-specific.
- the method described here can serve for the verification or authenticity check of 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.
- Electroluminescent radiation is increased. In other words, this means that the electroluminescence radiation is amplified by the preceding UV irradiation (amplification effect). This enhancement effect can be maintained even after completion of the UV irradiation for a predetermined period of time.
- Electroluminescent radiation are generated for identification in a reliable manner over the entire life cycle of the security feature.
- the security feature is irradiated with UV radiation in time before being exposed to the alternating electric field. This means that the UV irradiation before the application of the electric
- Alternating field begins.
- the security feature is preferably applied to the alternating electric field only after completion of the UV irradiation.
- the beginning of the application of the alternating electric field can take place with a time duration of less than 1 second after the termination of the UV irradiation.
- the electroluminescent radiation generated due to the application of the alternating electric field is detected only after completion of the UV irradiation, since the UV irradiation can additionally generate an unwanted photoluminescent radiation of the first substance.
- a time period between the termination of the UV irradiation and the beginning of the application of the alternating electric field is longer than 0 seconds. Alternatively or cumulatively, the time is shorter than 600
- the further substance comprises at least one
- the effect provided by the further substance can also be used in addition to the verification of the security feature and thus of the security product. This advantageously increases the reliability of the verification.
- the further substance has at least proportionally a metal oxide layer.
- this layer consists at least partially of titanium dioxide.
- other metal oxides are also usable.
- the metal oxide consists at least partially of TiO 2 .
- Layers consisting of TiO 2 or other metal oxides exhibit an increase in the electrical conductivity when irradiated with high-energy radiation, in particular with UV radiation, and thus lead to a significant increase in the electroluminescent radiation.
- a further substance consists of a desired material, in particular a metal oxide, more particularly of TiO 2 .
- at least one effect produced by the effect pigment is detected.
- the effect pigment is identified as a function of the generated effect.
- the effect pigment in particular in addition to the dependence on the property of the electroluminescent radiation, can be identified as a function of an effect produced by the effect pigment.
- the effect can be one of the optical effects explained above.
- the security feature may be under various aspects
- Illumination angles are illuminated, in particular with radiation of a predetermined wavelength, radiation from a predetermined wavelength range or with radiation from different wavelength ranges.
- the security feature may reflect or emit under the illumination
- Radiation under different detection angles are detected or viewed from different viewing angles.
- the security feature can be verified. If the effect pigment or a predetermined type of effect pigment can not be identified, the security feature can not 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 produced is attributable to the further substance.
- Component in particular a substance, at least one security feature of a security product.
- the device is used to carry out a method according to one of the embodiments described in this disclosure.
- the device is designed such that the corresponding method by means of the device is feasible.
- the device comprises at least one device for generating high-energy radiation, in particular 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 is in particular a device for generating UV radiation.
- the device for generating high-energy radiation is in particular a device for generating UV radiation. This can be designed, in particular, as a UV discharge lamp, as a UV LED or as a high-power UV LED.
- the at least one security feature can be irradiated, in particular by the device for generating UV radiation.
- the security feature can be acted upon by an alternating electric field, in particular by a device for generating an alternating electric field.
- the device for generating an alternating electric field may be formed as an electrode or comprise at least one electrode. Next is one emitted from the first substance
- Electroluminescent radiation detectable, in particular by the device for detecting electroluminescent radiation.
- Electroluminescent radiation may be, for example, a photodetector, a spectrometer or an image capture device. This or the device can also have suitable filter elements in addition to the suitable sensors.
- the first and / or the further substance of the security feature can be identified as a function of at least one property of the electroluminescent radiation.
- the evaluation device can detect the property of the electroluminescent radiation. This has been explained previously.
- an irradiation area of the at least one device for generating UV radiation is from an application area of the at least one device for generating the alternating electric field different. This may mean that there is a spatial separation between the UV irradiation area and the loading area.
- the device may comprise the transport device.
- the UV irradiation area may be arranged in the transporting direction in front of the loading area. It is also possible, in this case, to arrange a series connection of a plurality of devices for generating UV radiation along the transport direction.
- Speed for example, up to 10 m / s, are transported through the device, wherein both the UV irradiation, the application of the excitation field as well as the detection of the electroluminescent radiation during the movement take place.
- the parameters of the UV irradiation in particular a period of time, an irradiation energy and / or an irradiation direction of the irradiation can be adjusted such that, during the transport through the UV irradiation area, the irradiation dose is sufficient to bring about a desired electroluminescent intensity or a desired electroluminescence intensity change subsequent impact with the alternating electric field to achieve.
- the device comprises at least one device for generating, detecting and evaluating an effect produced by an effect pigment.
- the device may comprise a plurality of sub-devices, each of which may be used for generating, for recording and / or for evaluation.
- the device may comprise a device for generating radiation from a predetermined wavelength range. The means for generating this radiation may be different from the previously described means for generating radiation.
- the device may comprise a subassembly for detecting the radiation reflected by the at least one effect pigment. This can
- Image capture device can in this case of the device for detecting
- Electroluminescent radiation different or equal to this device.
- the device may 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 or equal to this device from the previously explained evaluation device for evaluating the property of the electroluminescent radiation.
- FIG. 1 is a schematic block diagram of a device according to the invention
- FIG. 2 shows a schematic block diagram of a device according to the invention in a further embodiment
- FIG. 5 shows a schematic representation of the electroluminescence intensity in FIG.
- Fig. 6 is a schematic representation of the increase in
- Fig. 7 is a schematic representation of the reduction of
- FIG. 1 shows 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 rests on a support surface 4.
- the device 1 comprises 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 8.
- the control and evaluation 8 may be designed as a microcontroller or include such.
- the device 5 for generating UV radiation may be formed as a UV LED.
- Alternating field may be formed 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 may in this case preferably be arranged such that the security document 3, in particular the security feature 2 of the security document 3, is arranged between these devices 6, 7.
- Security document 3 may be arranged, wherein at least two of the devices 5, 6, 7 may be arranged on one side of the security document 3. However, this is not mandatory. Also, all devices 5, 6, 7 may be arranged on the same side of the security document 3. It is important that the electroluminescent radiation generated by the security feature 2 under exposure to the alternating electric field, which is generated by the device 6, can be detected by the device 7. It is also important that the UV irradiation from the side of the
- Security document 3 takes place, on which the security feature 2 is arranged.
- the security feature 2 comprises a first substance, not shown, with
- the first substance is in particular a powdered zinc sulfide electroluminophore.
- the further substance comprises, in particular, optical effect pigments, in particular titanium dioxide-coated mica pigments.
- the means 5 for generating UV radiation, the means 6 for generating an alternating electric field and the means 7 for detecting electroluminescent radiation are arranged and / or formed such that a security feature 2 as 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 by the device 5 for generating UV radiation with UV radiation. After the beginning of the 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 detection of the electroluminescent radiation generated on the basis of the excitation field can take place after the end of the UV irradiation.
- Security feature 2 is excited with the alternating electric field, then the first substance emits electroluminescent radiation, which is detected by the means 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 comprises the first substance. For example, this can be identified if the intensity is greater than a first predetermined (low) threshold.
- the further substance can be identified if the intensity is higher than another predetermined threshold value, wherein the further predetermined threshold value is higher than the first predetermined threshold value.
- the further predetermined threshold can here be dependent on a strength of the alternating electric field. For a certain strength of the alternating electric field, the intensity of the
- Electroluminescent radiation in the case in which the security feature 2 comprises the further substance be higher than in the case in which the security feature 2 does not include the further substance.
- the intensity can also be a kind of further substance, in particular a material or a
- Material composition to be determined for different types of further substances, in particular under and / or after UV irradiation, the electrical conductivity and thus the intensity of the electroluminescent radiation can change in various ways.
- the described method can be used to verify the security feature 2 and thus the security document 3.
- the security feature 2 can be verified if both the first substance and the further substance has 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. In contrast to that shown in Fig. 1
- Embodiment here are 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 arranged such that the
- the device 6 transported, for example by means of a transport device, not shown.
- the support surface 4 may be the surface of a conveyor belt.
- FIG. 3 shows a schematic flow diagram of a method according to the invention for identification.
- a security feature 2 (see, for example, FIG. 1) which comprises a first substance having electroluminescent properties and at least one further substance, the further substance being a variable by UV irradiation has electrical conductivity is applied in a first step S1 with an alternating electric field and detects the intensity of the emitted electroluminescent radiation (signal).
- a third step S3 is the
- Electroluminescence detected (signal 2).
- a fourth step S4 the ratio between the intensities (signal2 / signal1) detected in the third step S3 and in 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, wherein the threshold value is greater than one. This has been explained previously. Furthermore, in the fourth step, the first substance can also be identified 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.
- Also shown is a device 6 for
- a glass plate 10 are arranged under the two electrodes 1 1, wherein in a space between the
- Electrodes 1 1 under the glass plate 10 epoxy 12 is arranged. Between the paper layer 9 and the glass plate 10 air 13 is arranged.
- the security feature 2 comprises electroluminescent pigments 14 as the first substance and optical effect pigments 15 as further substance.
- the electroluminescent pigments 14 are pigments 14 of a pulverulent zinc sulfide electroluminophore.
- the optical effect pigments 15 are mica-based pigments coated with a TiO 2 layer. Through the electrode 1 1, an excitation field can be generated, which in turn leads to the emission of electroluminescent radiation. This electroluminescent radiation may then be detected as previously explained.
- FIG. 5 shows a schematic representation of the electroluminescence intensity in FIG.
- the detected electroluminescence intensities after UV irradiation of a security feature comprising the first substance and the further substance in a first mixing ratio are represented by circles.
- the abscissa represents the irradiation dose while the height of the detected
- Electroluminescence intensities is plotted on the ordinate.
- the rectangles represent the detected electroluminescence intensities after UV irradiation of a security feature which comprises the first substance and the further substance in a further mixing ratio.
- the further mixing ratio is different from the first mixing ratio.
- Electroluminescence intensity increases with increasing irradiation dose in both cases, the increase has approximately a logarithmic increase and thus sets at radiation doses above a predetermined threshold saturation.
- FIG. 6 shows a schematic representation of the increase in the electroluminescence intensity as a function of the irradiation dose after UV irradiation of a security feature which comprises both the first and the further substance. It can be seen that the electroluminescence intensity increases with increasing irradiation dose, wherein the increase has approximately a logarithmic course and thus sets the explained saturation of the detected intensity.
- Fig. 7 shows a schematic representation of the reduction of
- Electroluminescence intensity after completion of UV irradiation Here it is shown that the electroluminescence intensity after UV irradiation with an energy of 45 mJ after more than 800 seconds again reached the initial level before the irradiation, which is represented by a solid line.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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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 (de) | 2016-08-11 | 2017-08-09 | Verfahren und vorrichtung zur identifikation zumindest eines sicherheitselements mindestens eines sicherheitsmerkmals eines sicherheitserzeugnisses |
Publications (2)
Publication Number | Publication Date |
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EP3497679A1 true EP3497679A1 (de) | 2019-06-19 |
EP3497679B1 EP3497679B1 (de) | 2023-09-27 |
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EP17749720.3A Active EP3497679B1 (de) | 2016-08-11 | 2017-08-09 | Verfahren und vorrichtung zur identifikation zumindest eines sicherheitselements mindestens eines sicherheitsmerkmals eines sicherheitserzeugnisses |
Country Status (4)
Country | Link |
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EP (1) | EP3497679B1 (de) |
DE (1) | DE102016215002A1 (de) |
ES (1) | ES2963296T3 (de) |
WO (1) | WO2018029253A1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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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 |
DE102008034021A1 (de) | 2008-07-16 | 2010-01-21 | Merck Patent Gmbh | Verfahren zur Herstellung eines Sicherheits- und/oder Wertprodukts mit Zufallsmuster und korrelierter Identzeichenfolge |
DE102008034022A1 (de) * | 2008-07-16 | 2010-01-21 | Merck Patent Gmbh | Verfahren zur Herstellung eines Sicherheits- und/oder Wertprodukts mit Teilbereichen mit unterschiedlicher Lumineszenzemission |
US10369831B2 (en) * | 2013-08-23 | 2019-08-06 | Merck Patent Gmbh | Printed image |
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 |
-
2016
- 2016-08-11 DE DE102016215002.2A patent/DE102016215002A1/de active Pending
-
2017
- 2017-08-09 WO PCT/EP2017/070199 patent/WO2018029253A1/de unknown
- 2017-08-09 EP EP17749720.3A patent/EP3497679B1/de active Active
- 2017-08-09 ES ES17749720T patent/ES2963296T3/es active Active
Also Published As
Publication number | Publication date |
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WO2018029253A1 (de) | 2018-02-15 |
EP3497679B1 (de) | 2023-09-27 |
ES2963296T3 (es) | 2024-03-26 |
DE102016215002A1 (de) | 2018-03-01 |
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