EP1004097B1 - Aufbau eines beugungsoptisch wirksamen sicherheitselements und vorrichtung zur prüfung derartiger elemente - Google Patents

Aufbau eines beugungsoptisch wirksamen sicherheitselements und vorrichtung zur prüfung derartiger elemente Download PDF

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Publication number
EP1004097B1
EP1004097B1 EP98932022A EP98932022A EP1004097B1 EP 1004097 B1 EP1004097 B1 EP 1004097B1 EP 98932022 A EP98932022 A EP 98932022A EP 98932022 A EP98932022 A EP 98932022A EP 1004097 B1 EP1004097 B1 EP 1004097B1
Authority
EP
European Patent Office
Prior art keywords
several
document
electrodes
construction
zones
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.)
Revoked
Application number
EP98932022A
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German (de)
English (en)
French (fr)
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EP1004097A1 (de
Inventor
Frank Puttkammer
Torsten Wolf
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.)
WHD Elektronische Prueftechnik GmbH
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WHD Elektronische Prueftechnik GmbH
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Application filed by WHD Elektronische Prueftechnik GmbH filed Critical WHD Elektronische Prueftechnik GmbH
Publication of EP1004097A1 publication Critical patent/EP1004097A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/02—Testing electrical properties of the materials thereof
    • G07D7/026—Testing electrical properties of the materials thereof using capacitive sensors
    • 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
    • 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
    • G07D7/0032—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 using holograms

Definitions

  • the invention relates to the construction of diffractive optical security elements and a device for testing such elements.
  • EP 0 097 570 proposes a device for checking the dielectric properties of sheet-like materials, in which the material to be tested is passed between the pairs of coatings of a series of capacitors having a specific configuration. A change in the dielectric properties results in a change in voltage at the receiving electrodes. The signals are amplified and evaluated individually.
  • this device which is based on the testing of the dielectric properties of the sheet material, in particular of watermarks, all the capacitors are fed simultaneously with the oscillator frequency, as a result of which coupling between adjacent channels can occur. If you choose a larger distance between the capacitors to avoid this defect, the achievable geometric resolution is reduced. This means that only rough structures can be detected.
  • EP 0 338 378 describes a combined process for printing and shaping a hologram, the reflection material being applied either only to the hologram itself or to the surrounding material. The material outside the hologram is either removed by etching or, in order not to damage the carrier layer, left on the carrier layer.
  • DE 27 47 156 describes a method and a testing device for checking the authenticity of holographically secured identity cards. The OVD is reproduced and a visual inspection is carried out. This procedure is not suitable for quick, efficient, person-independent testing.
  • EP 0 042 946 describes a device for generating scanning patterns which are checked using a laser, mirror and lens system and a photodetector.
  • the economic effort is very high in this case too. It would increase even further if the test material was to be checked unsorted. In order to avoid presorting, the authenticity checking system would have to be arranged several times.
  • Demetallizations in diffraction-optically effective security elements for achieving optical effects are also known, which until now have only been checked using optical methods.
  • optically variable security elements for documents in the form of so-called holograms and security threads have metal layers, the metal layers in holograms serving for reflection and making the security threads appear opaque in transmitted light. Overlapping metallized and demetallized areas in a bar and a meandering pattern cause perceived brightness patterns to be shifted in transmitted light.
  • the object of the invention is to eliminate the disadvantages of the prior art and a Development of diffractive optical security elements, especially OVD's, holograms or kinegrams to propose that quickly, regardless of person and with little effort to be checked. Furthermore, it is an object of the invention to provide a device for testing to propose documents containing such security elements. The device should be used in document processing machines as well as in manual testing devices for testing of documents with security elements effective in diffraction optics.
  • this task is solved by a device with the features of claim 1 and a method with the features of claim 13 .
  • holograms and other safety elements with optical diffraction effects to secure documents and other securities as well as banknotes against counterfeiting is currently becoming increasingly common.
  • documents are e.g. the DM banknotes of the 1997 edition, which next to the electrically conductive security strip have a diffractive optical security element in the form of a kinegram.
  • a Fast testability represents a further security level when evaluating the diffractive optics effective elements as an authenticity feature.
  • Optically diffractive elements exist including a metallized layer. This metallization layer is electrical conductive. The electrical conductivity changes according to the layer thickness.
  • the diffraction optic active element has a discontinuous metallization layer according to the invention and / or partially metallic layers on having a targeted electrical encoding of information represent.
  • the shape of the coding resembles geometric figures, in particular Lines, grid lines, arcs and / or circles that are both regular and irregular are arranged.
  • a partially metallic layer arranged above a carrier layer includes several demetallized segments.
  • a discontinuous layer of metallization contains segments with different electrical conductivity.
  • the device has a capacitive scanner.
  • This scanner consists of a large number of adjacent transmission electrodes and a parallel to this string lying receiving electrode.
  • the scanner is in a document processing machine arranged so that the existing in conventional document processing machines optical or mechanical sensors activate the test device according to the invention.
  • a sensor carrier is preferably used to reduce detection and measurement errors. This sensor carrier holds all sensors for testing. The distances between the sensors are minimized and the sensors are always arranged in a defined position.
  • control of the individual transmitter electrodes with electrical energy is delayed by means of control electronics with a switching frequency in the kHz range.
  • the control electronics contains the main components in addition to the power supply, a multiplexer, one Oscillator for providing the energy for the transmitting electrodes and an oscillator for Control of the multiplexer.
  • the energy of the respective controlled transmission electrode becomes capacitively coupled over between this transmitting and the receiving electrode. Is not electrical conductive feature exists, there is no energy transfer between the controlled transmitter electrode and the receiving electrode instead.
  • the waveform at the receiving electrode is converted into a corresponding signal image.
  • the signal pattern depends on the Structure of the metallized layer of the diffractive optical element. Point. the diffractive elements have a discontinuous metallization layer, so several segments of the metallization layer have different electrical conductivities.
  • An evaluation electronics following the receiving electrode compares the signal image of the device under test with corresponding reference signals.
  • the evaluation electronics consists of Essentially from a power supply, an amplifier, a demodulator, a Comparator, a microprocessor with memory and filters to suppress Foreign and interference signals.
  • reference signal images are stored in a memory and are compared with the scanned signal image of the test document. Since the scanner extends across the entire width of the document, each electrically conductive feature is detected using the device according to the invention. The comparison with the reference signal images provides a classifying signal for further processing. Accordingly, for example, a document recognized as a false certificate could be sorted out by stopping the test device.
  • the sensor carrier is compactly connected to a circuit board that carries the control and evaluation electronics. The entire test facility is located within document processing machines, so that the space requirement is kept relatively small.
  • the transmitting and receiving electrodes are arranged above or below the documents in document processing machines in such a way that reliable scanning is ensured.
  • a further embodiment of the transmitting and receiving electrodes is characterized in that a plurality of transmitting and receiving electrodes are arranged next to one another and / or in series. Both the control and the reception of the signals are processed using the multiplex or demultiplex method. For use in handheld devices, they contain corresponding devices for analog.
  • Transport of the document or scanner the function of which is similar to the transport devices in copiers, optical image scanners or fax machines.
  • a device which defines the position of the capacitive scanner of the inventive test device in relation to the document by means of stop elements. In this case, the document is only checked in the area of the transmitting and receiving electrodes.
  • FIGS. 1 to 5 each show documents with security elements according to the invention, each of which contains a targeted electrical coding, the capacitive scanner of the device according to the invention also being shown schematically.
  • 1 shows the schematic structure of an OVD 1 with a metallization layer 2 .
  • the metallization layer 2 has a demetallized zone 3 .
  • the top view of the demetallized zone 3 is shaped like a meander.
  • the width of the demetallized zone 3 in the form of a meander is larger than the smallest distance between two electrodes.
  • the capacitively operating scanner consists of a plurality of transmitting electrodes 5 lying next to one another and a receiving electrode 6 lying parallel to this series.
  • FIG. 2 shows the schematic structure of an OVD, in which alternately metallized strip-shaped zones 7 and demetallized strip-shaped zones 8 are arranged parallel to one another.
  • the zones 7, 8 which are strip-shaped in plan view run parallel or perpendicular to the document transport direction. The latter case is shown in Fig. 3.
  • the distance between two zones of the same electrical conductivity is between 0.2 and 1.0 mm.
  • the widths of the zones with the same electrical conductivity vary.
  • FIG. 4 Parallel to the document transport direction, alternating metallized strip-like zones 7 and demetallized strip-like zones are arranged.
  • the metallized zones 7 are interrupted by a strip-shaped demetalized zone 9 running perpendicularly thereto.
  • 6 to 9 illustrate the block diagram and various configurations of the capacitive scanner 4 .
  • 6 shows the block diagram of the test device according to the invention, consisting of control electronics, a capacitively operating scanner 4 and evaluation electronics.
  • the control electronics essentially contain a demultiplexer 10 , an oscillator 11 for providing the energy for the transmission electrodes and an oscillator 12 for controlling the demultiplexer.
  • the evaluation electronics mainly consist of a power supply, an amplifier 13 , a demodulator 14 , a comparator 15 , a microprocessor 16 with memory and filters for suppressing external and interference signals.
  • the transmitter and receiver electrodes are cast in a sensor carrier. These form a capacitive scanner 4 over the entire width of the document feeder.
  • the strip-shaped receiving electrode runs across the document feed direction.
  • the transmitting electrodes are arranged parallel to the receiving electrode. The distance between a transmitting electrode and the receiving electrode is determined by the document-typical electrically conductive test features.
  • By lining up a plurality of transmitting electrodes it is possible to simultaneously detect several electrically conductive features in the longitudinal axis of the capacitive scanner 4 .
  • the resolution that can be achieved with this arrangement depends on the number of transmitting electrodes used. In this embodiment, the resolution is at one scannable point per mm in both the longitudinal and transverse directions. The minimum distance between adjacent transmission electrodes is limited by the interfering capacitive coupling.
  • the transmission electrodes are controlled in succession by a multiplexer 10 . Due to the arrangement of the transmitting electrodes over the entire document feed width, the documents are checked in a position-neutral manner. This means that there is no pre-sorting of several documents in one document processing machine.
  • FIG. 7 shows the schematic representation of the scanner 4 with a multiplicity of transmission electrodes 5 and a reception electrode 6. The control and evaluation is carried out according to the block diagram shown in FIG. 6.
  • FIG. 8 shows the schematic representation of an embodiment of the capacitive scanner with a transmitting electrode 17 and a plurality of receiving electrodes 18. In a modification of the block diagram according to FIG. 6, the transmitting electrode 17 is controlled by means of an oscillator.
  • the signals of the receiving electrodes 18 are processed by means of multiplexers.
  • the further evaluation electronics consisting of a power supply, an amplifier, a demodulator, a comparator, a microprocessor with memory and filters for suppressing external and interference signals, is similar to the block diagram according to FIG. 6.
  • FIG. 9 shows the schematic representation of a further embodiment of the capacitive scanner with a multiplicity of transmitting electrodes 19 and a multiplicity of receiving electrodes 20 . These are alternately arranged in a row. Accordingly, both the control signals of the transmitting electrodes 19 and the evaluation signals of the receiving electrodes 20 are processed by means of multiplex or demultiplexing methods. 10 shows a schematic illustration of the capacitive scanner 4 and a document to be checked in a side view.
  • the OVD contains partial metallizations 21 and an electrically insulating carrier film 22 .
  • 11 shows a schematic section through an OVD with a carrier layer 23 and a partially metallic layer 24 .
  • the partially metallic layer 24 contains several demetallized segments 25.
  • the associated evaluation signal is shown in FIG. 12 in a voltage-time diagram.
  • 13 shows a schematic section through an OVD with a carrier layer 26 and a discontinuous metallization layer 27 .
  • the discontinuous metallization layer 27 contains segments 28, 29, 30, 31, 32 with different electrical conductivity.
  • 14 shows the associated evaluation signal in a voltage-time diagram.
  • the structure was based on specific exemplary embodiments Diffractive optical security elements and a device for testing such Elements explained.
  • the present invention does not go into the details the description in the exemplary embodiments is restricted, since within the scope of Changes and modifications are claimed.
  • the diffractive optical security element also other electrically conductive features detected by the device according to the invention.
  • the targeted combination of diffraction optics effective security elements with other electrically conductive features results in another Encoding.
  • other electrically conductive test features such as on electrically conductive security thread or codings made of electrically conductive paint, by means of Classify the test device according to the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Holo Graphy (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Telescopes (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
EP98932022A 1997-08-12 1998-04-24 Aufbau eines beugungsoptisch wirksamen sicherheitselements und vorrichtung zur prüfung derartiger elemente Revoked EP1004097B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19734855 1997-08-12
DE19734855A DE19734855B4 (de) 1997-08-12 1997-08-12 Vorrichtung zur Prüfung beugungsoptisch wirksamer Sicherheitselemente
PCT/DE1998/001178 WO1999009527A1 (de) 1997-08-12 1998-04-24 Aufbau beugungsoptisch wirksamer sicherheitselemente und vorrichtung zur prüfung derartiger elemente

Publications (2)

Publication Number Publication Date
EP1004097A1 EP1004097A1 (de) 2000-05-31
EP1004097B1 true EP1004097B1 (de) 2002-01-16

Family

ID=7838710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98932022A Revoked EP1004097B1 (de) 1997-08-12 1998-04-24 Aufbau eines beugungsoptisch wirksamen sicherheitselements und vorrichtung zur prüfung derartiger elemente

Country Status (22)

Country Link
EP (1) EP1004097B1 (sk)
JP (1) JP2003517646A (sk)
KR (1) KR20010022778A (sk)
CN (1) CN1265761A (sk)
AT (1) ATE212143T1 (sk)
AU (1) AU8208198A (sk)
BG (1) BG64293B1 (sk)
BR (1) BR9811153A (sk)
CA (1) CA2300961A1 (sk)
DE (2) DE19734855B4 (sk)
DK (1) DK1004097T3 (sk)
ES (1) ES2172157T3 (sk)
HU (1) HUP0003358A3 (sk)
ID (1) ID25447A (sk)
NO (1) NO20000615L (sk)
PL (1) PL187652B1 (sk)
PT (1) PT1004097E (sk)
SA (1) SA98190497B1 (sk)
SK (1) SK1782000A3 (sk)
TR (1) TR200000651T2 (sk)
UA (1) UA50838C2 (sk)
WO (1) WO1999009527A1 (sk)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812811A1 (de) 1997-08-12 1999-09-23 Whd Elektron Prueftech Gmbh Aufbau von Sicherheitselementen für Dokumente und Vorrichtungen zur Prüfung von Dokumenten mit derartigen Sicherheitselementen sowie Verfahren zur Anwendung dieser Sicherheitselemente und Vorrichtungen
EP1168253A1 (en) 2000-06-28 2002-01-02 Sicpa Holding S.A. Use of communication equipment and method for authenticating an item, specifically documents, in particular security documents, communication equipment for authenticating items, and items to be authenticated by communication equipment
EP1179811B1 (en) * 2000-08-11 2008-10-15 European Central Bank Security document and process for producing a security document
FR2828316A1 (fr) * 2001-08-02 2003-02-07 Sequoias Authentification d'un document par superposition ou combinaison de niveaux de securisation
DE10248954A1 (de) * 2002-10-21 2004-04-29 Giesecke & Devrient Gmbh Sicherheitselement für Ausweis- und Wertdokumente
DE102004044458B4 (de) * 2004-09-15 2010-01-07 Ovd Kinegram Ag Sicherheitsdokument
CN100511262C (zh) * 2006-09-07 2009-07-08 中国科学院长春光学精密机械与物理研究所 一种光学防伪无损检测装置
CN104049003A (zh) * 2014-06-10 2014-09-17 中国人民银行印制科学技术研究所 一种阵列电容式感应传感器及有价证券防伪检测方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1474903B2 (de) * 1965-12-11 1972-09-07 Thurnberger, Paul, Munderfing (Osterreich) Verfahren zur pruefung der echtheit von banknoten
DE2747156A1 (de) 1977-10-20 1979-04-26 Siemens Ag Verfahren und pruefgeraet zur echtheitspruefung holografisch abgesicherter identitaetskarten
US4255652A (en) * 1979-01-31 1981-03-10 Coulter Systems Corporation High speed electrically responsive indicia detecting apparatus and method
DE2919649A1 (de) * 1979-05-16 1980-11-20 Bbc Brown Boveri & Cie Sicherheitspapier
EP0042946A3 (en) 1980-06-25 1982-06-02 International Business Machines Corporation Holographic scanner for generating scan patterns and its application to the sensing of bar code labels
FR2528970B1 (fr) * 1982-06-22 1985-09-27 Flonic Sa Dispositif de verification d'epaisseur de matieres dielectriques en feuille
US4576439A (en) * 1982-09-15 1986-03-18 Rca Corporation Reflective diffractive authenticating device
US4913504A (en) * 1982-11-08 1990-04-03 American Bank Note Holographics, Inc. Documents or like articles bearing holograms
NO165697C (no) * 1988-03-10 1991-03-20 Inter Marketing Oy Ab Sensor for ekthetskontroll av sikkerhetspapir.
EP0360969B1 (de) * 1988-09-30 1993-12-15 Landis & Gyr Business Support AG Beugungselement
DE4002979A1 (de) * 1990-02-01 1991-08-08 Gao Ges Automation Org Wertpapier mit optisch variablem sicherheitselement
GB2250474B (en) * 1990-12-04 1994-04-20 Portals Ltd Security articles
EP0543058A1 (de) * 1991-11-21 1993-05-26 Klaus Henning Dipl.-Ing. Steiger Falschgeldsucher
DE4423295C2 (de) * 1994-07-02 1996-09-19 Kurz Leonhard Fa Beugungsoptisch wirksame Strukturanordnung
DE19512921A1 (de) * 1995-03-30 1996-10-02 Lfp Elektronische Spezialsiche Einrichtung zur Prüfung von Sicherheitsdokumenten
DE19548532A1 (de) * 1995-12-22 1997-06-26 Giesecke & Devrient Gmbh Verfahren zur Detektion eines elektrisch leitfähigen Elements in einem Dokument
DE19718916A1 (de) * 1997-04-25 1998-10-29 Whd Elektron Prueftech Gmbh Anwendung und Verfahren zur Prüfung von Kokumenten mit beugungsoptisch wirksamen Sicherheitsschichten

Also Published As

Publication number Publication date
TR200000651T2 (tr) 2000-08-21
JP2003517646A (ja) 2003-05-27
SK1782000A3 (en) 2000-10-09
KR20010022778A (ko) 2001-03-26
BG104143A (en) 2000-06-30
PT1004097E (pt) 2002-07-31
ATE212143T1 (de) 2002-02-15
SA98190497B1 (ar) 2006-08-14
DE19734855A1 (de) 1999-02-18
UA50838C2 (uk) 2002-11-15
NO20000615L (no) 2000-04-07
AU8208198A (en) 1999-03-08
BG64293B1 (bg) 2004-08-31
HUP0003358A3 (en) 2002-11-28
DE19734855B4 (de) 2005-09-08
DK1004097T3 (da) 2002-05-06
NO20000615D0 (no) 2000-02-08
DE59802653D1 (de) 2002-02-21
WO1999009527A1 (de) 1999-02-25
HUP0003358A2 (hu) 2001-02-28
ES2172157T3 (es) 2002-09-16
PL338473A1 (en) 2000-11-06
CN1265761A (zh) 2000-09-06
CA2300961A1 (en) 1999-02-25
PL187652B1 (pl) 2004-08-31
EP1004097A1 (de) 2000-05-31
BR9811153A (pt) 2000-07-25
ID25447A (id) 2000-10-05

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