EP3874475A1 - Magnetic testing of valuable documents - Google Patents
Magnetic testing of valuable documentsInfo
- Publication number
- EP3874475A1 EP3874475A1 EP19801474.8A EP19801474A EP3874475A1 EP 3874475 A1 EP3874475 A1 EP 3874475A1 EP 19801474 A EP19801474 A EP 19801474A EP 3874475 A1 EP3874475 A1 EP 3874475A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- security element
- coercive
- minimum
- maximum
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 239000000696 magnetic material Substances 0.000 claims abstract description 57
- 230000001939 inductive effect Effects 0.000 claims abstract description 37
- 238000005259 measurement Methods 0.000 claims description 96
- 230000005415 magnetization Effects 0.000 claims description 71
- 238000011156 evaluation Methods 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims 1
- 238000010998 test method Methods 0.000 claims 1
- 230000032258 transport Effects 0.000 description 46
- 230000004907 flux Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005417 remagnetization Effects 0.000 description 1
- 238000012795 verification Methods 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
- G07D7/004—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 digital security elements, e.g. information coded on a magnetic thread or strip
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/369—Magnetised or magnetisable materials
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
Definitions
- the invention relates to a method and a testing device for the magnetic testing of documents of value, such as Banknotes, checks, cards, tickets, coupons, and a document processing device.
- inductive magnetic detectors which usually have only a few measurement tracks transverse to the direction of transport of the value document and offer a spatial resolution that is too low to read finely structured magnetic codes. Inductive magnetic detectors are therefore often only used to detect the presence of a magnetic security element. It is also known to use an inductive magnetic detector by two or more of the other detector elements mentioned above, e.g. to be replaced by GMR elements and to electronically connect these detector elements so that their magnetic signal resembles that of an inductive magnetic detector. The magnetic signal can then advantageously be subjected to the same evaluation which can also be used for the magnetic signal of the inductive magnetic detector.
- the invention is therefore based on the object of proposing an evaluation for the magnetic signal generated by a security element of a magnetic detector, in particular an inductive magnetic detector, by means of which the magnetic coding of a security element can be checked.
- This object is solved by the subject matter of the independent claims.
- Advantageous developments and refinements of the invention are specified in claims dependent thereon.
- the document of value to be checked has a security element with one or more magnetic areas.
- the magnetic areas include, for example, one or more low-coercive magnetic areas made of a low-coercive magnetic material with a first coercive field strength and one or more high-coercive magnetic areas made of a highly coercive magnetic material with a second coercive field strength that is greater than the first coercive field strength, and optionally one or more Combined magnetic areas that contain both the high-coercive and the low-coercive magnetic material.
- it can have both high and low coercive magnetic areas, but it can also have only one type of these magnetic areas.
- the document of value or the security element of the document of value is magnetized by a first magnetic field region, the magnetic field strength of which is greater than the first and the second coercive field strength.
- the magnetization of the highly coercive magnetic material (a highly coercive and possibly a combined magnet area) and the magnetization of the low coercive magnetic material (egg nes low coercive and possibly a combined magnetic area) are aligned uniformly in a first magnetization direction.
- the document of value or the security element is then magnetized by a second magnetic field region, the magnetic field strength of which is greater than the first coercive field strength but is smaller than the second coercive field strength.
- the second magnetic field area is oriented so that the magnetization of the low-coercive magnetic material (a low-coercive and possibly a combined magnet area) is oriented in a second magnetization direction different from the first magnetization direction.
- the magnetization of the highly coercive magnetic material (a highly coercive and possibly a combined magnetic area) remains unchanged in the first magnetization direction during the second magnetization.
- the first and second magnetization of the security element by the first and second magnetic field regions leads to the magnetization of one or more low-coercive magnetic regions possibly present on the security element being oriented in a different magnetization direction than the magnetization of one or more possibly existing high-coercivity magnetic areas on the security element.
- the first and second magnetic field areas can be spatially different areas of the same magnetic field that is generated by the same magnet. However, they can also be generated by the magnetic fields of several magnets.
- the first and second magnetic field areas can be provided by the test device itself or by a value document processing device in which the test device is contained.
- the first and second magnetizing can also be carried out outside of such devices, e.g. by a magnetization device, in the magnetic field areas of which the documents of value for magnetization are introduced manually or mechanically.
- the first and second magnetic field areas and a (in particular inductive) magnetic detector are provided along a transport path of the value document, along which the value document is transported.
- the document of value with the security element first passes through the first magnetic field area one into one first magnetic field direction pointing first magnetic field strength, which is greater than the Koerziüvvfeld strength of the two magnetic materials, and then the second magnetic field region of a second magnetic field strength pointing in another, second magnetic field direction, which is greater than the coercive field strength of the low-coercive magnetic material, but is smaller than the Ko - Erzitivfeld strength of the highly coercive magnetic material.
- both magnetic materials are first magnetized in the first magnetic field region and then only the low-coercive magnetic material is remagnetized in the second magnetic field region, whereas the magnetization of the highly coercive magnetic material generated by the first magnetic field region remains.
- the two magnetic materials are then magnetized in different magnetization directions.
- the document of value with the security element is transported along a transport direction past a (particularly inductive) magnetic detector which has a plurality of measurement traces transverse to the transport direction of the document of value.
- the magnetic detector detects a magnetic signal as a function of time, ie as a function of the position along the transport direction of the value document transported past the magnetic detector.
- magnetoresistive elements AMR, GMR, TMR or Hall elements which are electronically connected to one another in a difference or whose magnetic signals are subtracted from one another in such a way that the resulting magnetic signal resembles that of an inductive magnetic detector.
- the magnetic signals of the security element detected by the individual measuring tracks are evaluated.
- the strongest two local minima of the respective magnetic signal are determined for several or all measuring tracks, which the respective magnetic signal of the respective measuring track has as a function of time or as a function of the position along the transport direction in the area of the security element.
- the strongest two local maxima of the respective magnetic signal can also be determined, which the respective magnetic signal of the respective measuring track has as a function of time or as a function of the position along the transport direction in the area of the security element.
- a minimum comparison value of the respective measurement track is determined for several of the measurement tracks by comparing the amplitude of the magnetic signal in the second strongest local minimum with the amplitude of the magnetic signal in the strongest local minimum.
- a maximum comparison value of the respective measurement track is determined for several of the measurement tracks by comparing the amplitude of the magnetic signal in the second strongest local maximum with the amplitude of the magnetic signal in the strongest local maximum.
- the magnetic coding of the security element is checked on the basis of the minimum comparison values of several or all measuring tracks and / or on the basis of the maximum comparison values of several or all measuring tracks. An evaluation of not all, but only several (preferably adjacent) measurement tracks may be sufficient if the magnetic coding is repeated along the security element. Furthermore, those measuring tracks that detect the edge of the security elements can be ignored when checking the magnetic coding.
- a local minimum / maximum of the respective magnetic signal is that point of the magnetic signal at which the amplitude of the magnetic signal as Function of time or as a function of the position along the transport direction takes a local minimum / a local maximum.
- (second) strongest local minimum is the local minimum of the respective magnetic signal at which the amplitude of the magnetic signal of all local minima has the (second largest distance from the zero point or from the offset of the magnetic signal into negative.
- the (second) strongest local maximum is the local maximum of the respective magnetic signal at which the amplitude of the magnetic signal of all local maxima has the (second largest distance from the zero point / offset of the magnetic signal to positive.
- each magnetic area can be identified either as a combined magnetic area or as a high-coercivity or as a low-coercivity magnetic area.
- the magnetic coding can also be checked as to whether the magnetic coding has magnetic areas with different coercive field strengths (different magnetic materials) or only magnetic areas of the same coercive field strength (made from the same magnetic material).
- the absolute amount of the strongest local minimum (global minimum) of the respective magnetic signal or the absolute amount of the strongest local maximum (global maximum) of the respective magnetic signal, which is the respective magnetic signal of the respective measuring track as a function of time or as a function of the position along the direction of transport in the area of the security element can be compared with a de minimis threshold. If the insignificance threshold is exceeded, it can be concluded that the security element in the respective section (transversely to the direction of transport) whose magnetic signal has detected the respective measurement track has a (for example highly coercive or low coercive or possibly combined) magnetic area.
- the security element in the respective section whose magnetic signal has detected the respective measurement track has a highly coercive or a low coercive (or possibly a combined) magnetic range.
- This evaluation is not carried out for insignificance thresholds, but it is deduced from the shortfall that the security element in the respective section, whose magnetic signal has detected the respective measuring track, has no low-coercive and no high-coercive magnetic range (and also no combined magnetic range) having.
- the respective minimum comparison value or the respective maximum comparison value is compared with a first threshold (and possibly also further thresholds).
- Information about the magnetic coding of the security element can be obtained based on whether the minimum comparison values of the individual measurement tracks exceed or fall below the first threshold or based on whether the maximum comparison values of the individual measurement tracks fall below or exceed the first threshold.
- a decision can be made as to whether the security element in the respective section, the magnetic signal of which has detected the respective measurement track, has a highly coercive (or possibly a combined) magnetic area or else has a low coercive magnetic area.
- the form of the inductive magnetic signal depends on the order in which the two inductive measuring heads of the inductive magnetic detector are connected to each other in difference. If the differential circuit is reversed, the positive and negative amplitudes of the magnetic signal are reversed, causing the maximum and minimum to be exchanged. Therefore, the evaluation logic must be adjusted depending on That is, depending on the order selected in the differential circuit, a decision must be made as to whether a magnetic area is identified as a low-coercive or a high-coercive magnetic area when the first threshold is exceeded or undershot.
- an inductive sensor as used in the example from FIG. 1, in the case when the minimum comparison value of the respective measuring track exceeds the first threshold and / or when the maximum comparison value of the respective measuring track falls below the first threshold, it is decided that Security element in the respective section, the magnetic signal of which has detected the respective measuring track, has a highly coercive (or possibly a combined) magnetic area. And in the case when the minimum comparison value of the respective measurement track falls below the first threshold and / or if the maximum comparison value of the respective measurement track exceeds the first threshold, it is decided that the security element in the respective section, the magnetic signal of the respective measurement track has detected, has a low-coercive magnetic range.
- the case will be when the minimum comparison value of the respective measurement track falls below the first threshold and / or if the maximum comparison value of the respective measurement track is the first Threshold exceeds, decided that the security element in the respective section whose magnetic signal has detected the respective measurement track has a highly coercive (or possibly a combined) magnetic area. And in the event that the minimum comparison value of the respective measurement track exceeds the first threshold and / or if the maximum comparison value of the respective measurement track falls below the first threshold, it is decided that the security element in the respective section, the magnetic signal of which has detected the respective measuring track, has a low-coercive magnetic area.
- the first security element category includes, for example, security elements which also have highly coercive magnetic material, for example one or more highly coercive magnetic areas and / or one or more combined magnetic areas.
- the first security element category is referred to, for example, as a "multicode security element”.
- the second security element category includes security elements that do not have a high-coercivity magnetic material, for example, that have only low-coercivity magnetic areas.
- the second security element category is, for example, as "no multicode security element" Security element ".
- the security element is assigned to the first security element category, for example, if the minimum comparison value calculated for the respective measurement track exceeds the first threshold with a minimum number n (natural number n) of measurement tracks and / or for a minimum number n of measurement tracks respective measurement track calculated maximum comparison value falls below the first threshold. Otherwise (if the respective minimum comparison value does not exceed the first threshold for the minimum number of measurement tracks and the respective maximum comparison value does not fall below the first threshold for the minimum number of measurement tracks), the security element is assigned to the second security element category. This is the case, for example, when exceeding or falling below none of the measuring tracks is observed at all or if the number of measuring tracks in which the first threshold is exceeded or fallen below is less than the minimum number n.
- the security element is assigned to the first category of security elements overrides if the minimum comparison value calculated for the respective measurement track falls below the first threshold for a minimum number n of measurement tracks and / or the maximum comparison value calculated for the respective measurement track exceeds the first threshold for a minimum number n of measurement tracks steps. Otherwise, the security element is assigned to a second category of security elements.
- the category assignment of the security element is possible by comparing with the first threshold.
- the category assignment could also be based on the scatter or standard deviation of the results of the minimum comparison along the security element. If the standard deviation were large, the security element would be assigned to a first security element category (“security element with different coercive magnetic areas”) and if the standard deviation was low, the security element would be assigned to a second security element category (“security element with only one type of magnetic area”).
- the respective minimum comparison value and / or the respective maximum comparison value can additionally be compared to a second threshold for one or more measuring tracks of the magnetic detector.
- the security element in the respective section whose magnetic signal has detected the respective measuring track, has a combined magnetic range. If the magnetic coding of the security element is checked on the basis of the minimum comparison values of several of the measurement tracks, a second threshold is used which lies above the first threshold. And if the magnetic coding of the security element is checked on the basis of the maximum comparisons of several of the measurement tracks, a second threshold is chosen which is below the first threshold.
- the high-coercivity and the low-coercivity magnetic material of the combined magnetic range are e.g. arranged on top of each other.
- the combined magnetic area has the high-coercive and the low-coercive magnetic material in the form of a mixture.
- the combined magnet area can have the same or different amounts of the high-coercivity and the low-coercivity magnet material. It can be designed such that the highly coercive magnetic material of the combined magnetic area and the low coercive magnetic material of the combined magnetic area have essentially the same remanent flux density, wherein the combined magnetic area can in particular contain the same amounts of the high coercive and the low coercive magnetic material.
- the invention also relates to a test device which is set up to test the above-mentioned value document, which is transported past a test device along a transport direction past a magnetic detector, in particular an inductive magnetic detector.
- the test device has the (in particular special inductive) magnetic detector which has a plurality of measurement tracks transverse to the transport direction of the value document and is set up in the measurement tracks (at least in the area of the security element) in each case to detect a magnetic signal as a function of time or as a function of the position along the transport direction of the value document.
- the magnetic detector has, for example, an inductive measuring head with two measuring coils, which are arranged one after the other in the transport direction of the value document.
- the two measuring coils are preferably connected to one another in difference and the difference signal of the two measuring coils is used as the magnetic signal of the respective measuring track.
- two magnetoresistive elements AMR, GMR, TMR or Hall elements can also be used, which are interconnected in such a way in difference or whose magnetic signals are subtracted from one another in such a way that the shape of the resulting magnetic signal matches the shape of the Magnetic signal of a single measuring coil of an inductive magnetic detector is similar.
- the security element was magnetized by the above-mentioned first magnetic field area, the magnetic field strength of which is greater than the first and second coercive field strengths, and then magnetized by the above-mentioned second magnetic field area, whose magnetic field strength is greater than that however, the first coercive field strength is smaller than the second coercive field strength, the security element being magnetized in a different direction by the second magnetic field region than by the first magnetic field region.
- the test device also has an evaluation device (connectable or connected to the magnetic detector), which is set up to evaluate the magnetic signals of the security element detected in the individual measurement tracks.
- the test device can be provided to be installed in a device for processing value documents.
- the document processing device has a transport device for Value documents, which is designed to transport value documents one after the other along the transport direction past the (in particular inductive) magnetic detector of the test device.
- the test device or the value document processing device can have one or more magnets, which along the transport path of the value document have the above-mentioned first magnetic field area for the first magnetization of the security element and (in the transport path behind the first magnetic field area) the above-mentioned second magnetic field area for the second magnetization of the security element.
- the first magnetic field region is arranged in front of the second magnetic field region and the magnetic detector is arranged after the second magnetic field region along a transport path of the value document through the checking device or through the value document processing device.
- the magnetic field direction of the second magnetic field region is different from that of the first magnetic field region, for example essentially antiparallel to it.
- the magnetic field strength of the first magnetic field area is greater than the second coercive field strength.
- the first magnetic field area is set up to align the magnetization of the low-coercive magnetic material and the magnetization of the highly coercive magnetic material in a first magnetization direction in a security element transported through the first magnetic field area.
- the second magnetic field area is set up to align the magnetization of the low-coercive magnetic material in a second magnetization direction different from the first magnetization direction, for example essentially antiparallel to the first magnetization direction, in the security element transported through the second magnetic field area, but the magnetization of the highly coercive magnetic material remains aligned in the first magnetization direction.
- the evaluation device has evaluation software which is set up to determine the strongest two local minima of the respective magnetic signal and / or the strongest two local maxima of the respective magnetic signal for several or all of the measurement tracks, which determine the respective magnetic signal of the respective measurement track has as a function of time or as a function of the position along the transport direction of the value document in the area of the security element.
- the software of the evaluation device is set up to determine a minimum comparison value of the respective measurement track by comparing the amplitude of the magnetic signal in the second strongest local minimum with the amplitude of the magnetic signal in the strongest local minimum and / or a maximum To determine the comparison value of the respective measurement track by comparing the amplitude of the magnetic signal in the second strongest local maximum with the amplitude of the magnetic signal in the strongest local maximum.
- Software of the evaluation device set up to check a magnetic coding of the security element on the basis of the minimum comparison values of several of the measurement tracks and / or on the basis of the maximum comparison values of several of the measurement tracks.
- the software of the evaluation device is set up to decide whether the security element is assigned to a first or a second security element category when checking the magnetic coding of the security element on the basis of the minimum comparison values and / or on the basis of the maximum comparison values of the individual measurement tracks , and / or to check whether the security element in the respective section (transverse to the transport direction of the value document) whose magnetic signal has detected the respective measurement track has a low-coercive or a high-coercive magnetic area (or possibly a combined magnetic area).
- FIG. 1 shows a document processing device with a magnetization device, a magnetic detector and an evaluation device
- FIG. 2 shows the course of the magnetic field lines for the magnetization device from FIG. 1,
- FIG. 3a-d magnetic signals of the inductive magnetic detector for a low-coercive magnetic area (FIG. 3a), for a high-coercive magnetic area (FIG. 3b), for a combined magnetic area (FIG. 3c), for a near the Measurement area lying magnetic areas of the security element (FIG. 3d),
- FIGS. 4a, 4c a first example of a security element (FIGS. 4a, 4c) and the minimum determined for this along the security element.
- FIG. 5a-d a second example of a security element (FIGS. 5a, 5c) and the minimum ratio v (FIG. 5b) and maximum ratio V (FIG. 5d) determined along the security element for this.
- FIG. 1 schematically shows a section of a value document processing device which is set up to check a magnetizable security element 31 of a value document 30.
- the value document processing device contains a test device 100, which has an inductive magnetic detector 50 and an evaluation device 60, and possibly further elements (not shown), such as input and output devices for value documents and operating elements.
- the document processing device has a transport device 17 and a magnetization device 10 made of two magnets 11, 12 lying opposite one another, which is arranged along the transport path of the document of value in front of and away from the inductive magnetic detector 50.
- the security element 31 has a low-coercive magnetic material with a first, low coercive field strength and a high-coercive magnetic material with a second, larger coercive field strength, which are contained in several sections of the security element transversely to the transport direction (y-direction).
- a highly coercive magnetic area h of the security element 31 has only the high coercive magnet material, but not the low coercive magnetic material
- a low coercive magnetic area 1 of the security element 31 has only the low coercive magnet material, but not the high coercive magnet material.
- the security element 31 can alternatively also have only one type of these magnetic materials. If necessary, a combined magnetic area k can also be present, which has both of the above-mentioned magnetic materials.
- the existing magnetic areas h or 1 or h, 1 or h, k, 1 form a magnetic coding of the security element 31.
- the value document 30 with the security element 31 is transported along the transport direction T by means of the transport device 17 of the value document processing device.
- the trans port device 17 can also include transport rollers.
- the security element 31 is magnetized by the two magnets 11, 12 in such a way that the magnetization directions of the high and low coercive magnetic areas h, 1 differ from one another. 1, the magnetization directions are at least approximately antiparallel to each other.
- the magnetization settings direction along the transport area, a first magnetic field area 15 and a second magnetic field area 16 downstream of the first magnetic field area in the transport direction T are ready, cf. Fig. 2.
- the two magnetic field regions 15, 16 described above are generated by means of two bar magnets 11, 12 which are opposite each other both with their north poles N and with their south poles S.
- the magnet axes 13 and 14 of the two magnets 11, 12 are aligned parallel to one another and to the transport direction T, but they can also be opposite to the transport direction T.
- the magnetic field lines of the magnetic field generated by such a magnetization device 10 are shown schematically in FIG. 2, which shows these magnetic field lines in a plane parallel to the x and z axes of FIG. 1, which intersects the two magnets 11 and 12 in the middle thereof. Accordingly, seen in the z-direction lies exactly in the middle between the magnets and in the x-direction between the poles N, S of the magnets 11,
- first magnetic field region 15 Seen in the transport direction T, downstream of it and behind the two magnets 11, 12, there is a magnetic field (second magnetic field region 16) with a lower magnetic field strength, which is oriented counter to the transport direction T.
- second magnetic field region 16 Seen in the transport direction T, downstream of it and behind the two magnets 11, 12, there is a magnetic field (second magnetic field region 16) with a lower magnetic field strength, which is oriented counter to the transport direction T.
- the magnetic field directions are oriented parallel or anti-parallel to the transport direction of the value document.
- one or both can also be different, for example perpendicular to the transport direction T of the value document (parallel or anti- parallel to the y direction or z direction shown in FIG. 1) or obliquely to these directions.
- the two magnet regions 15, 16 can also be generated by a single magnet 11 or 12 or by two or four magnets whose magnet axes are perpendicular to the transport direction (z direction), e.g. which are arranged above and / or below the value document and are located opposite one another with their magnetic poles of the same name on the end face.
- z direction transport direction
- other angles to one another can also be selected for the two magnetic field directions.
- a first magnetization is achieved in which both the magnetization of the low-coercive magnetic region 1 and that of the high-coercive magnetic region h are aligned along the transport direction T.
- the second magnetic field area 16 only the magnetization of the low-coercive magnetic area 1 is changed in the direction opposite to the transport direction T. Since the magnetic field strength of the second magnetic field region 16 is less than the second coercive field strength, the highly coercive magnetic region h is not remagnetized by the second magnetic field region 16.
- the magnetization of the low-coercive magnetic region 1 is, however, aligned approximately antiparallel to the transport direction T by the second magnetization.
- the combined magnetic area k is designed such that the low-coercive magnetic material of the combined magnetic area and the high-coercive magnetic material of the combined magnetic area have at least approximately the same remanent flux density.
- the inductive magnetic detector 50 After the first and second magnetization in the two magnetic field areas 15, 16, magnetic signals of the security element are detected by the inductive magnetic detector 50 and the magnetic signals are evaluated in order to check the magnetic coding of the security element.
- the inductive magnetic detector 50 has a plurality of measuring tracks L (four in FIG. 1) for the spatially resolved detection of the magnetization of the security element, each of which has an inductive measuring head.
- Each of the inductive measuring heads has two measuring coils 51 with a soft magnetic core and an interposed magnet 52 for generating a magnetic field that is constant over time.
- the magnetic field generated by the respective magnet 52 acts on the security element 31.
- a single, appropriately dimensioned magnet can also be used for all measurement tracks.
- the measuring coils 51 generate corresponding signals, which are referred to as magnetic signals.
- the two measuring coils 51 of the respective measuring head are preferably connected in a difference from one another, so that the difference signal of the two measuring coils 51 is generated for each measuring track L as a magnetic signal.
- the magnetic signals M of each measurement track L can each be amplified with a separate amplifier.
- the magnetic signals M generated in this way are finally evaluated by means of the evaluation device 60 in order to check the magnetic coding of the security element.
- the magnetic signals are only evaluated to assign the security element to one (of two or more) security element categories. For this purpose, it can be sufficient to determine whether the magnetic signal of a highly coercive magnetic area h (or possibly also a combined magnetic area k) was detected in any of the measuring tracks L along the security element (multicode security element) or whether only other magnetic signals nale were detected (no multi-code security element).
- the magnetic signals of the security element can be evaluated with regard to the presence of the individual previously described magnetic areas h, 1 (and possibly also k) on the security element.
- the magnetic signals can optionally also be used to identify each individual magnetic area and the sequence and arrangement of the magnetic areas on the security element in order to provide the magnetic coding of the security element 31 check.
- the magnetic signal Mi is shown as an example, which the respective inductive measuring head of the magnetic detector 50 generates as a function of the time t or as a function of the position x along the value document transported past (at the magnetic detector 50) when a low-coercive magnetic area 1 is transported past it (differential connection of the two measuring coils 51).
- FIG. 3b shows the corresponding magnetic signal M h that the respective inductive measuring head generates when a highly coercive Magnetic area h is transported past it.
- FIG. 3c shows the corresponding magnetic signal M k that the respective inductive measuring head generates when a combined magnetic area k is transported past it.
- the corresponding magnetic signal M 0 is shown, which is detected in a measuring track L which is outside the magnetic areas of the security element (offset in the y direction), but is close to the magnetic areas.
- the exact shape of the magnetic signals of the individual magnetic areas depends on the type of magnetic detector used.
- the magnetic signals of the magnetic areas 1, h and k shown in FIGS. 3a-d have a complex structure of several minima and maxima.
- the complexity of these magnetic signals is based on the measurement technology used, in which two inductive measuring heads are switched in difference.
- the difference between the magnetic signal Mi of the low-coercive magnetic area 1 in comparison to the magnetic signal M h of the high-coercive magnetic area h is essentially based on its inverse magnetization (generated by the magnetic field area 16).
- the magnetic field of the magnet 52 located between the measuring heads also influences the shape of the magnetic signals, since this magnetic field leads to magnetic reversal of the low-coercive magnetic material during the detection process or between the detection processes of the two measuring coils 51.
- the magnet 52 Before the measurement of the first measuring coil 51 begins, there is therefore hardly any magnetization of the combined magnetic range k, but after the first measuring coil 51, the magnet 52 generates a resulting magnetization by the above-mentioned remagnetization of the low-coercive magnetic material between the detection processes of the two measuring coils 51.
- the magnetic signal Mo also has maxima and minima, but has a significantly lower amplitude than the other magnetic signals, in which the respective magnetic range has hit the respective measuring track exactly in the y direction.
- the absolute amount of the strongest maximum or the strongest minimum of the respective magnetic signal is compared with a de minimis threshold g, cf. 3a-d.
- the magnetic detector 50 or the evaluation device 60 can carry out the comparison. If the de minimis threshold g falls below, as is the case here with the magnetic signal M 0 , the magnetic signal of the respective measuring track L is ignored for further evaluation.
- the respective magnetic signal When exceeding the ge insignificance threshold g, as is the case here with the magnetic signals Mi, M h and M k , the respective magnetic signal is used to check the coding of the security element.
- the evaluation device 60 which is programmed with a corresponding evaluation software, determines the strongest two local minima ml, m2 of the respective magnetic signal (the local minima with the largest absolute amount) for these magnetic signals Mi, M h and M k, for example has the respective magnetic signal of the respective measuring track L as a function of the position x or the time t in the area of the security element.
- the maximum comparison values V or U of several measurement tracks L can be evaluated alone or can be evaluated in addition to the minimum comparison values u or v. If necessary, both can also be offset against each other.
- FIG. 4a shows an example of a security element 31, the magnetic coding of which has only two low-coercive magnetic areas 1.
- the magnetic signals of the measuring tracks L2, L3 and L6 have minimum comparison values v around 0.25, as are expected for low-coercive magnetic areas 1.
- the magnetic signals of the other measuring tracks are below the de minimis threshold g.
- the minimum comparison values v m2 / ml of the measurement tracks L2, L3, and L6 are compared with a first threshold tl stored in the evaluation device 60, which is, for example, about 0.35. Due to the fact that the first threshold t1 is undershot, it is concluded that the security element has low-coercive magnetic areas 1 in the (y) sections, the magnetic signals of which have detected the measuring tracks L2, L3 and L6.
- the security element 31 from FIG. 4a is therefore assigned to a first category, which is designated, for example, with “magnetic coding without highly coercive magnetic material” or “no multicode security element”.
- Fig. 4c is identical to Fig. 4a.
- FIG. 5a (identical to FIG. 5c) shows another example of a security element 31, the magnetic coding of which has two high-coercive magnetic areas h and a low-coercive magnetic area 1 and a combined magnetic area k.
- 5b shows its minimum evaluation and
- FIG. 5d shows its maximum evaluation.
- the security element 31 from FIGS. 5a, c is therefore assigned to a second category, which is designated, for example, “magnetic coding with highly coercive magnetic material” or “multicode security element”.
- the assignment of the security element 31 to the second category can be linked to the condition that the first threshold tl for the minimum comparison values of at least n measurement tracks L must be exceeded so that the security element 31 of the second category (“multicode security element”)
- the first threshold t 1 so that the security element 31 is assigned to the second category
- no multicode security element
- a second threshold t2 can be stored in the software, with which the minimum comparison values v and the maximum comparison values V are compared .
- the security element can be assigned to a third category which may be used (“multicode security element with combined magnetic range”) A corresponding categorization of the security element from FIGS.
- the security element in the y-sections that the measurement tracks L2, L5 and L7 has one or more highly coercive or combined magnetic areas k and - based on falling below the first threshold tl in the measuring tracks L3 - that the security element has a low-coercive magnetic area 1 in the y section corresponding to the measuring track L3.
- the relative or absolute y-positions of the low-coercive magnetic areas 1, the highly coercive magnetic areas h (and possibly the combined magnetic areas k) of the security element can be compared for the more precise check with reference data which are stored in the evaluation device 60 for several known security elements are. On the basis of this comparison, the magnetic coding can possibly also be checked with regard to the sequence and / or arrangement of the different magnetic areas.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018008519.9A DE102018008519A1 (en) | 2018-10-30 | 2018-10-30 | Magnetic verification of documents of value |
PCT/EP2019/000300 WO2020088790A1 (en) | 2018-10-30 | 2019-10-25 | Magnetic testing of valuable documents |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3874475A1 true EP3874475A1 (en) | 2021-09-08 |
EP3874475B1 EP3874475B1 (en) | 2023-12-06 |
Family
ID=68531506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19801474.8A Active EP3874475B1 (en) | 2018-10-30 | 2019-10-25 | Magnetic testing of valuable documents |
Country Status (6)
Country | Link |
---|---|
US (1) | US11263854B2 (en) |
EP (1) | EP3874475B1 (en) |
CN (1) | CN112955938B (en) |
DE (1) | DE102018008519A1 (en) |
PT (1) | PT3874475T (en) |
WO (1) | WO2020088790A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6518747B2 (en) * | 2001-02-16 | 2003-02-11 | Quantum Design, Inc. | Method and apparatus for quantitative determination of accumulations of magnetic particles |
US7451641B2 (en) * | 2003-10-03 | 2008-11-18 | C.R.F. Società Consortile Per Azioni | Magnetic transduction sensor device, manufacturing process and detection process therefrom |
US7538546B2 (en) * | 2006-11-10 | 2009-05-26 | Infinitum Solutions, Inc. | In-plane magnetic field generation and testing of magnetic sensor |
DE102007025939A1 (en) | 2007-06-04 | 2008-12-11 | Giesecke & Devrient Gmbh | Security element for securing value documents |
DE102009039588A1 (en) * | 2009-09-01 | 2011-03-03 | Giesecke & Devrient Gmbh | Method and device for checking value documents |
RU2549137C2 (en) * | 2010-06-09 | 2015-04-20 | Гизеке Унд Девриент Гмбх | Method and device for inspection of documents of value |
KR101553092B1 (en) * | 2010-12-10 | 2015-09-14 | 니혼 덴산 산쿄 가부시키가이샤 | Magnetic pattern detecting device |
DE102011120972A1 (en) * | 2011-12-13 | 2013-06-13 | Giesecke & Devrient Gmbh | Method and device for checking value documents |
DE102013205891A1 (en) * | 2013-04-03 | 2014-10-09 | Giesecke & Devrient Gmbh | Examination of a security element provided with magnetic materials |
DE102013021969A1 (en) * | 2013-12-20 | 2015-06-25 | Giesecke & Devrient Gmbh | Magnetization device for testing a security element |
DE102016015545A1 (en) * | 2016-12-27 | 2018-06-28 | Giesecke+Devrient Currency Technology Gmbh | Method and device for detecting a security thread in a value document |
-
2018
- 2018-10-30 DE DE102018008519.9A patent/DE102018008519A1/en not_active Withdrawn
-
2019
- 2019-10-25 US US17/289,006 patent/US11263854B2/en active Active
- 2019-10-25 WO PCT/EP2019/000300 patent/WO2020088790A1/en unknown
- 2019-10-25 CN CN201980070607.8A patent/CN112955938B/en active Active
- 2019-10-25 EP EP19801474.8A patent/EP3874475B1/en active Active
- 2019-10-25 PT PT198014748T patent/PT3874475T/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020088790A1 (en) | 2020-05-07 |
CN112955938A (en) | 2021-06-11 |
CN112955938B (en) | 2022-07-29 |
US11263854B2 (en) | 2022-03-01 |
DE102018008519A1 (en) | 2020-04-30 |
EP3874475B1 (en) | 2023-12-06 |
US20210407241A1 (en) | 2021-12-30 |
PT3874475T (en) | 2024-02-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2580745B1 (en) | Method and apparatus for checking value documents | |
EP2791919B1 (en) | Method and device for checking value documents | |
EP2473978B1 (en) | Method and device for testing value documents | |
EP2376932B1 (en) | Magnetic sensor for checking value documents | |
EP2745277B1 (en) | Measuring device for measuring the magnetic properties of the surroundings of the measuring device | |
EP0467202B1 (en) | Arrangement for testing of objects with magnetic properties | |
EP2981948B1 (en) | Inspection of a security element provided with magnetic materials | |
EP2742492B1 (en) | Test configuration for testing security documents | |
EP2307898A1 (en) | Measuring apparatus for measuring magnetic properties, and method for producing such a measuring apparatus | |
EP3084731B1 (en) | Magnetisation device for the testing of a security element | |
DE102010035469A1 (en) | Sensor of device for examination of value document e.g. check, has magnetoresistive element positioned such that field of magnet at magnetoresistive element is oriented perpendicular to sensitivity direction of magnetoresistive element | |
EP2941759B1 (en) | Measuring device for measuring magnetic properties of the surroundings of the measuring device | |
EP3262432B2 (en) | Method for biasing of magnetic materials on a measurement object | |
EP2929514A1 (en) | Device for examining a value document and method for examining a value document | |
DE2834287A1 (en) | Banknote ferromagnetic security strip testing - involves magnetising strip in different ways and signals are compared with reference values | |
EP3874475B1 (en) | Magnetic testing of valuable documents | |
DE1774448A1 (en) | Device for the automatic checking of the authenticity of coins | |
DE102016015545A1 (en) | Method and device for detecting a security thread in a value document | |
EP3590103A1 (en) | Magnetic testing of valuable documents | |
DE1549044A1 (en) | Device for displaying markings on a magnetically marked object, for example a steel wire rope |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20210531 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230519 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20230718 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 502019010109 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
REG | Reference to a national code |
Ref country code: PT Ref legal event code: SC4A Ref document number: 3874475 Country of ref document: PT Date of ref document: 20240212 Kind code of ref document: T Free format text: AVAILABILITY OF NATIONAL TRANSLATION Effective date: 20240205 |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240307 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20231206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240307 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240306 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240306 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231206 |