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WO2008068031A1 - Dispositif de vérification d'un élément de sécurité dans des documents - Google Patents

Dispositif de vérification d'un élément de sécurité dans des documents Download PDF

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Publication number
WO2008068031A1
WO2008068031A1 PCT/EP2007/010654 EP2007010654W WO2008068031A1 WO 2008068031 A1 WO2008068031 A1 WO 2008068031A1 EP 2007010654 W EP2007010654 W EP 2007010654W WO 2008068031 A1 WO2008068031 A1 WO 2008068031A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrodes
row
document
capacitors
security element
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.)
Ceased
Application number
PCT/EP2007/010654
Other languages
German (de)
English (en)
Inventor
Jevgenij Mannhart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEB Industrie Elektronik AG
Original Assignee
BEB Industrie Elektronik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102006058265A external-priority patent/DE102006058265A1/de
Application filed by BEB Industrie Elektronik AG filed Critical BEB Industrie Elektronik AG
Publication of WO2008068031A1 publication Critical patent/WO2008068031A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/02—Testing electrical properties of the materials thereof
    • G07D7/026—Testing electrical properties of the materials thereof using capacitive sensors

Definitions

  • the invention is based on a device for detecting a security element in documents such as banknotes, banknotes or checks, in which the dielectric constant of the security element is different from that of the rest of the document.
  • the invention is intended to detect a security strip in documents.
  • the prior art discloses methods and devices for testing metal filaments, metal strips and metal particles, which are contained as security elements in documents.
  • documents may be, for example, banknotes, securities, documents, identity cards or
  • the security elements can be embedded in the document.
  • the security elements on one side are covered by the material of the document.
  • individual sections are provided which cover the security elements at least partially to the outside. It may be to deal with contiguous or non-contiguous sections.
  • the sections covering the security elements can consist of a metal or a metal connection, for example.
  • the material of the sections may agree with the material of the security elements.
  • the security elements may be covered by the material of the document. For example, a forged document will miss the embedded security elements.
  • the document in question is given a predetermined
  • Coil can be arranged. This ensures a high technical complexity and correspondingly high costs of the associated device.
  • Devices have the disadvantage that they can not distinguish whether in documents with embedded security elements only the corresponding to the covers of the security elements sections or additionally also the security elements are present. If both the security elements and the sections consist of a material that triggers a comparable signal in the associated sensor, then it can not be determined during the evaluation whether the signal is only provided by the sections arranged on the surface of the document or by the combination of security elements and covering sections was created.
  • the invention is based on the object to provide an apparatus for detecting a security element such as in particular a security strip in documents such as bank notes and banknotes, which is characterized by a very high detection sensitivity even with small deviations of the dielectric constant of the security element compared to the rest of the material of the document and which is able to distinguish between a document with embedded security elements and covering sections on the one hand and a document without security elements but with sections arranged on the surface.
  • the device should be simple and inexpensive to manufacture.
  • the device according to the invention has the advantage that not only security elements made of metal can be detected in documents with high accuracy, but also any other security elements which have a different dielectric constant than the rest of the document.
  • a capacitive sensor is provided, which essentially consists of a support and at least five electrodes arranged side by side on the support. The electrodes form at least four capacitors.
  • the carrier is preferably a printed circuit board.
  • the electrodes are elongated and strip-shaped. They are arranged on the circuit board in three rows. All electrodes are parallel to each other and perpendicular to the transport direction of the document under test on the
  • Capacitors in two rows wherein in each row at least two capacitors are positioned side by side.
  • arranged successively means here that a relative to the device transported document with its front edge first one component and a short time later he reached the other component.
  • Arranged next to one another in the transport direction means that a document transported relative to the device reaches both components simultaneously with its leading edge.
  • the arrangement of the electrodes results in that one capacitor of the first row and one capacitor of the second row are arranged one behind the other in the transport direction.
  • the electrodes are arranged in at least three rows. Since two electrodes form a capacitor and an electrode in the middle can be part of two capacitors, this results at least two rows of capacitors.
  • the two successive or successively arranged in the transport direction of capacitors form a measuring cell.
  • at least two measuring cells are arranged side by side on the carrier.
  • Each of the capacitors is connected to at least one ohmic resistance and forms a low-pass RC element.
  • An AC voltage source is used to power the RC elements.
  • the time increase and decrease of the voltage at the two RC elements is evaluated, while a document, the two capacitors a
  • Measuring cell happens.
  • the document is transported by means of a transport device or manually.
  • the document is preferably transported in such a way that the security element is aligned parallel to the transport direction. Since at least two measuring cells with two capacitors each are arranged side by side, and the strip-shaped security element has a small width, the security element only passes through one measuring cell during the transport of the document.
  • the documents are transported in such a way or the capacitors arranged such that the security element is always passed by a particular measuring cell. This measuring cell is called
  • Main measuring cell called.
  • the remaining measuring cell or measuring cells are referred to as reference measuring cells.
  • the document is passed directly past the electrodes of the capacitors. It is located, for example, above or below the electrodes in the electric field generated by the electrodes.
  • Range of 0.1 to 5 picofarads are demonstrated, with the capacities the capacitors used are preferably in the range of 10 to 50 picofarads.
  • the electric field generated by the electrodes not only acts in the space between the electrodes, but also in the area adjacent to the electrodes through which the document is passed. Because the
  • the evaluation circuit is preferably located in the region of the carrier, so that the evaluation circuit is exposed to the same influences as the measuring circuit itself.
  • the capacitors of a measuring cell are constantly charged and discharged by the AC voltage source. Each cell works in the same way.
  • the time constants ⁇ i and X 2 of the two RC elements of a measuring cell determine the rate of transhipment of the two
  • a signal detector of the evaluation circuit serves to derive a signal from the voltage curves at the two capacitors, which provides information as to whether the document passed by the capacitors is equipped with a security element and optionally with additional sections, and whether this
  • the two RC elements advantageously have different time constants X 1 and ⁇ 2 .
  • the time constant ⁇ corresponds to the product of the resistance and the capacitance of an RC element. Therefore, to achieve different time constants, either the resistances of the two RC elements or the capacitances of the two RC elements must be different.
  • a logic element for example, a PLL module can be used.
  • a PLL module contains an oscillator and, as a rule, several phase detectors, one of which is designed as an OR gate (exclusive OR).
  • OR gate exclusive OR
  • the function of the logic element, the comparator or the differential amplifier is similar.
  • the relevant block has two inputs. One input, the voltage waveform on the first capacitor of the measuring cell is supplied, the other input of the voltage waveform at the second capacitor of the measuring cell.
  • a "0" signal is generated at the output of the device if both inputs have a voltage above a threshold value and a signal other than "0" is generated at the output if one input has a voltage above a threshold and at the other input a voltage below the threshold is applied.
  • the threshold value is exceeded or fallen below, depends on the two time constants ⁇ i and ⁇ 2 .
  • the capacitance of the two capacitors is influenced by the dielectric constant of the document passing by the two capacitors and the security element contained in the document. Is therefore on one of the two
  • Differential amplifier as a correct safety feature. In this way, parts of the document can be detected. A change in the thickness of the document can also be detected so that the device can also be used as a thickness sensor.
  • the signals of the main measuring cell and the one or more reference measuring cells are evaluated in the same way.
  • a comparison of the signals from the main measuring cell and the reference measuring cell provides information about the thickness of the section guided by the main measuring cell with the security element and the thickness of the portion of the document guided through the reference measuring cell without a security element. This allows a comparison between the thickness of the document on the one hand and the thickness of the security element on the other. If the thickness of the security element deviates from the specified thickness of the security element of a genuine document, it is possible to infer an impermissible change in the document or a forged document.
  • the timing of the signals, in particular the signal of the main measuring cell provides information about the shape and the presence of a security element and several sections that cover the security element.
  • the signal will be different from the signal given above even if the areas in FIG their area coincide with the sections.
  • the signal of the forged document has no maximum, which corresponds to a continuous strip-shaped security element, but a
  • the device is equipped with at least seven electrodes, which together form at least six capacitors. There are at least three in the first row
  • Electrodes arranged in the second row at least one electrode and in the third row at least three electrodes.
  • the six capacitors form a total of three measuring cells.
  • Each measuring cell consists of two capacitors arranged one behind the other in the transport direction.
  • the capacitors of the middle measuring cell are substantially wider than the
  • Capacitors of the two outer measuring cells so that the security element of the documents to be checked in each case passes through the middle measuring cell.
  • the middle measuring cell is therefore called the main measuring cell.
  • the two outer measuring cells are reference measuring cells.
  • one of the electrodes is at ground potential.
  • it forms part of all capacitors. It can extend over the entire width of all capacitors, for example. Their length may be equal to or greater than the sum of the lengths of the remaining electrodes arranged in a row. In this way, four capacitors and two measuring cells can be realized, for example, with five electrodes. With seven electrodes, six capacitors and three measuring cells can be formed.
  • the electrodes are elongated and strip-shaped. They have a straight course.
  • the two longitudinal sides of the electrodes aligned perpendicular to the transport direction consist of two parallel sections.
  • the narrow sides can either also have a rectilinear or a curved course.
  • the electrodes form a rectangular area on the carrier. Thickness, width and spacing of the electrodes are chosen as a function of the security element to be detected.
  • one of the electrodes in the first row and one of the electrodes in the third row is longer than each further electrode in the first and the third row.
  • These are preferably the electrodes of the capacitors of the main measuring cell. This ensures that the security element of each document passes the main measuring cell.
  • the shape of a maximum indicates the security element.
  • Capacitor with the smaller time constant is usually sufficient.
  • the amplitude of the voltage curve on the capacitor with the larger time constant is often too small.
  • the amplitude of the voltage of the capacitor is amplified with the larger time constant in order to trigger switching operations in the block of the evaluation circuit can.
  • a coupling capacitor can be provided, via which the voltage at the capacitor with the larger time constant is supplied to the component. In this case, a separate amplifier is not required.
  • a feedback of the output of the integrator with the AC voltage source is provided for frequency control of the AC voltage source.
  • the output signal of the integrator is amplified by an amplifier by a predetermined factor and shifted in level by a fixed DC component.
  • the thus modified output signal is supplied as a frequency-controlling voltage of the AC voltage source.
  • FIG. 1 Capacitive sensor with evaluation circuit and bank note in FIG.
  • FIG. 2 is a circuit diagram of the evaluation circuit
  • FIG. 3 arrangement of the electrodes of the capacitive sensor according to FIG. 1 in a view from below, FIG.
  • FIG. 5a genuine banknote in a view from above
  • FIG. 5b genuine banknote according to FIG. 5a in a sectional illustration, section along the plane marked A - A in FIG. 5a
  • FIG. 5c shows a genuine banknote according to FIG. 5a in a sectional view
  • FIG. 6 shows the time course of the signal of the main measuring cell of the capacitive sensor according to FIGS. 1 and 3 taken for the banknote according to FIG. 5 a, along the plane marked B - B in FIG.
  • FIG. 7a a counterfeit note in a top view
  • FIG. 7b shows a fake banknote according to FIG. 7a in a sectional representation
  • FIG. 7a shows a cross-section along the plane marked A - A in FIG. 7a
  • FIG. 7c shows a counterfeit banknote according to FIG. 7a, section along the plane marked B-B in FIG. 7a
  • FIG. 7a shows a cross-section along the plane marked A - A in FIG. 7a
  • FIG. 7c shows a counterfeit banknote according to FIG. 7a, section along the plane marked B-B in FIG. 7a
  • FIG. 8 shows the time course of the signal of the main measuring cell of the capacitive sensor according to FIGS. 1 and 3 taken up to the banknote according to FIG. 7a. Description of the embodiments
  • Figure 1 shows a bill 1, a capacitive sensor 3, an evaluation circuit 4 and a guide 5 for the bill in cross section.
  • the elongated banknote 1 is preferably guided past the sensor 3 in such a way that it is oriented with its long side perpendicular to the transport direction.
  • a security strip 2 embedded in the bill and shown in FIGS. 4 and 5c is aligned parallel to the transport direction.
  • the bill 1 is moved through the gap formed between the sensor 3 and the guide 5.
  • the capacitive sensor 3 consists of a carrier 7 and a plurality of electrodes arranged side by side parallel on the carrier 7, of which only the three electrodes 8, 9 and 10 can be seen in FIG.
  • the carrier 7 is a printed circuit board.
  • the electrodes 8, 9 and 10 are expediently made of copper. They are separated by an insulating layer 11 of the carrier of a further copper layer 12. About contacts not visible in the drawing, the electrodes 8, 9 and 10 are advantageously electrically connected via the copper layer 12 to the evaluation circuit 4. As a result, the influence of scattered radiation can be avoided.
  • the other electrodes 30, 31, 32 and 33 which are shown in FIG.
  • Figure 2 shows a circuit for the operation of the capacitive sensor 3 with a
  • AC voltage source 13 the two capacitors 14 and 15, which are formed by the electrodes 8, 9 and 10, two resistors 16 and 17, an XOR gate 18 and with an integrator 22 formed from resistors 19, 20 and a capacitor 21.
  • Ein Coupling capacitor 23 serves to separate the DC voltage component of the voltage applied to the capacitor 15.
  • An amplifier 24 at the output of the integrator amplifies the output signal and passes it through a feedback loop 25 of the AC voltage source 13 to. This serves to control the frequency of the AC voltage source to increase the sensitivity of the evaluation circuit.
  • the amplified output signal is finally supplied to a microprocessor 26 with integrated analog-to-digital converter 27 and an output 28. Is it just a matter of determining if the
  • Banknote contains a security strip or not, the output 28 logic "0" if the bill contains a security strip, and logical "1" if the bill does not contain a security strip.
  • the occupancy can also be reversed.
  • Sections are in the right place and / or have the correct size and / or consist of the right material, so the evaluation must be differentiated.
  • the output 28 carries logic "0" if the security strip is included and correct with respect to all features, and logical "1" if the security strip deviates from the defaults with respect to at least one feature. Again, the occupancy can be reversed.
  • the AC voltage source generates an AC voltage having a frequency which is typically in the range of 200 kHz to 400 kHz.
  • FIG. 3 shows the capacitive sensor 3 according to FIG. 1 in a view from below.
  • four further electrodes 30, 31, 32 and 33 are arranged. They form together with the grounded electrode 9 four more capacitors.
  • the two capacitors 14 and 15 of the electrodes 8, 9 and 10 represent the main measuring cell. It is located in the middle.
  • the two capacitors 34 and 35 of the electrodes 30, 9 and 31 form a first reference measuring cell.
  • the two capacitors 36 and 37 of the electrodes 32, 9 and 33 form a second reference measuring cell.
  • the capacitors 14, 15, 34, 35, 36 and 37 are additionally represented in FIG. 3 by the corresponding electrical symbols.
  • the evaluation circuit of the two reference measuring cells corresponds to the evaluation circuit of the main measuring cell according to FIG. 2.
  • FIG. 4 shows the capacitive sensor 3 according to FIG. 3 in a greatly simplified form.
  • the main measuring cell 38 and the two reference measuring cells 39 and 40 are indicated.
  • the bill is 1 with the security strip
  • the arrow 6 indicates the direction of transport of the bill 1. From the illustration it follows that due to the dimensions of the main measuring cell 38 and the two reference measuring cells 39 and 40, which result from the dimensions of the electrodes 8, 9, 10, 30, 31, 32 and 33, the security strip 2 of a bill 1 always on of the
  • FIGS 5a, 5b and 5c show the bill 1 with the security strip 2 in different views. It is a genuine banknote, in which the metallic material
  • Security strip 2 is embedded in the paper of the bill. At the bottom 41 of the bill 1, the security strip 2 is completely covered by paper. At the top 42, the security strip is covered by individual sections 43 of paper and by individual sections 44 of a metallic material.
  • the thickness of the paper of the bill 1 in this embodiment is 100 microns.
  • the thickness of the security strip 2 is 50 ⁇ m.
  • FIG. 6 shows the time profile 45 of the signal of the main measuring cell 38, which was recorded for the banknote 1.
  • FIGS. 7a, 7b and 7c show a counterfeit bill 46 without security strips in different views. From the sectional views in FIGS. 7b and 7c, it appears that, unlike the banknote 1 shown in FIGS. 5a, 5b and 5c, no security strip is inserted into the paper of the banknote
  • the counterfeit banknote 46 is similar to the genuine banknote 1, since at the positions where the genuine banknote 1 comprises individual sections 44 made of a metallic material, sections 47 printed on the counterfeit banknote 46 are located. Sections 47 are consistent with sections 44 of the genuine bill in terms of position on the bill and size of its face. From the comparison of the two sectional views according to FIGS. 5b and 7b as well as FIGS. 5c and 7c, it can be seen that the bills 1 and 46 differ in their thickness. The thickness of the paper of the counterfeit bill 46 is also 100 microns and thus corresponds to the thickness of the paper of the real bill. However, the portions 47 are printed on the surface of the counterfeit bill 46 and are thus beyond the surface. In the area of the sections 47, therefore, the counterfeit banknote 46 is thicker than the genuine banknote 1. This can be determined by means of the capacitive sensor 3 by comparing the signals of the main measuring cell and the two reference measuring cells.
  • FIG. 8 shows the time profile 48 of the signal of the main measuring cell 38, which was recorded for the banknote 46.
  • the voltage is at an initial level.
  • the time course 48 of the signal shows a number of individual maxima 49 whose voltage is about 220 mV.
  • the maxima are generated by the individual sections 47 on the bill 46, which consist of a material that complies with metal particles.
  • the number of maxima 49 therefore corresponds to the number of sections 47 on the banknote 46.
  • the signal drops back to the initial level.
  • the signal generated by the counterfeit bill 46 on the main measuring cell differs not only in the shape of its time course but also in terms of the maximum voltage of that of a genuine bill 1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne la vérification d'un élément de sécurité (2) dans des documents (1) à transporter par rapport au dispositif comme des documents de valeur, billets de banque et/ou des chèques, l'élément de sécurité étant conçu notamment comme des bandes de sécurité et la constante diélectrique de l'élément de sécurité (2) est différente de celle document (1) restant. Le dispositif présente au moins cinq électrodes en bande (8, 9, 10, 30, 31, 32, 33) allongées et placées sur un support (7), lesdites électrodes étant toutes parallèles et leur côté longitudinal étant perpendiculaire au sens de défilement du document, et constituent les au moins quatre condensateurs (14, 15, 34, 35, 36, 37). Au moins deux électrodes (8, 30, 32) d'une première rangée sont juxtaposées. Au moins une électrode (9) est placée dans une deuxième rangée. Au moins deux électrodes (10, 31, 33) sont juxtaposées dans une troisième rangée. Chaque condensateur (14, 15, 34, 35, 36, 37) est associé à une résistance ohmique. Condensateur et résistance forment ensemble respectivement un organe RC. Une source de tension alternative (13) sert d'alimentation de tension des organes RC. Un circuit d'évaluation (4) sert à l'évaluation de la variation de la tension au niveau des organes RC lors du passage du document (1) au niveau des condensateurs (14, 15, 34, 35, 36, 37).
PCT/EP2007/010654 2006-12-08 2007-12-07 Dispositif de vérification d'un élément de sécurité dans des documents Ceased WO2008068031A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006058265A DE102006058265A1 (de) 2006-01-30 2006-12-08 Vorrichtung zum Nachweis eines Sicherheitselements in Dokumenten
DE102006058265.9 2006-12-08

Publications (1)

Publication Number Publication Date
WO2008068031A1 true WO2008068031A1 (fr) 2008-06-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/010654 Ceased WO2008068031A1 (fr) 2006-12-08 2007-12-07 Dispositif de vérification d'un élément de sécurité dans des documents

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WO (1) WO2008068031A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355300A (en) * 1980-02-14 1982-10-19 Coulter Systems Corporation Indicia recognition apparatus
WO1994022114A1 (fr) * 1993-03-18 1994-09-29 Authentication Technologies, Inc. Dispositif de verification capacitif pour un fil de securite integre dans un billet de banque
EP0698866A1 (fr) * 1994-08-22 1996-02-28 WHD elektronische Prüftechnik GmbH Machines à essayer et méthode pour essayer des documents dans une machine à usiner
WO1996030879A1 (fr) * 1995-03-30 1996-10-03 WHD elektronische Prüftechnik GmbH Procede et dispositifs permettant de verifier des documents de securite
WO1998019277A1 (fr) * 1996-10-31 1998-05-07 Authentication Technologies, Inc. Systeme de detection d'un fil place dans une monnaie introduite dans ce systeme par son cote large

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4355300A (en) * 1980-02-14 1982-10-19 Coulter Systems Corporation Indicia recognition apparatus
WO1994022114A1 (fr) * 1993-03-18 1994-09-29 Authentication Technologies, Inc. Dispositif de verification capacitif pour un fil de securite integre dans un billet de banque
EP0698866A1 (fr) * 1994-08-22 1996-02-28 WHD elektronische Prüftechnik GmbH Machines à essayer et méthode pour essayer des documents dans une machine à usiner
WO1996030879A1 (fr) * 1995-03-30 1996-10-03 WHD elektronische Prüftechnik GmbH Procede et dispositifs permettant de verifier des documents de securite
WO1998019277A1 (fr) * 1996-10-31 1998-05-07 Authentication Technologies, Inc. Systeme de detection d'un fil place dans une monnaie introduite dans ce systeme par son cote large

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