EP0064102A2 - Document avec fil de sécurité et procédé pour le contrôle de sa validité - Google Patents

Document avec fil de sécurité et procédé pour le contrôle de sa validité Download PDF

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Publication number
EP0064102A2
EP0064102A2 EP81110619A EP81110619A EP0064102A2 EP 0064102 A2 EP0064102 A2 EP 0064102A2 EP 81110619 A EP81110619 A EP 81110619A EP 81110619 A EP81110619 A EP 81110619A EP 0064102 A2 EP0064102 A2 EP 0064102A2
Authority
EP
European Patent Office
Prior art keywords
security thread
scattered
document
radiation
cross
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
Application number
EP81110619A
Other languages
German (de)
English (en)
Other versions
EP0064102A3 (en
EP0064102B1 (fr
Inventor
Heinrich Peter Baltes
André M.J. Huiser
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Landis and Gyr AG
LGZ Landis and Gyr Zug 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4236500&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0064102(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Landis and Gyr AG, LGZ Landis and Gyr Zug AG filed Critical Landis and Gyr AG
Publication of EP0064102A2 publication Critical patent/EP0064102A2/fr
Publication of EP0064102A3 publication Critical patent/EP0064102A3/de
Application granted granted Critical
Publication of EP0064102B1 publication Critical patent/EP0064102B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation
    • 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

Definitions

  • the object of the invention specified in claims 1 and 5 is to provide a document with a security thread and a method for checking its authenticity, which ensures a very high level of security against forgery by the authenticity features of the security thread being particularly difficult for a counterfeiter to analyze and imitate.
  • a security thread 1 is drawn in a perspective, very greatly enlarged representation, which e.g. can consist of metal, metal-coated plastic or transparent plastic.
  • the cross section of this security thread 1 has a shape that differs from both a rectangle and a circle.
  • the cross section preferably has the shape of an irregular polygon, the outer angles of which are partly larger and partly smaller than 180 °.
  • the cross-sectional shape is constant over the entire length or at least over a predetermined partial length of the security thread 1. Authenticity feature that the more complicated the cross-sectional shape and the smaller the cross-section, the more difficult it is to analyze and imitate.
  • the security thread 1 lies in FIG. 1 parallel to the y-axis of a coordinate system.
  • an electromagnetic beam 2 preferably a sufficiently monochromatic, spatially coherent infrared light beam, is directed onto the security thread 1.
  • This beam 2 which in the example shown is incident perpendicularly on the security thread 1 in the z, x plane of the coordinate system, is scattered on the security thread 1 in a predetermined, characteristic manner.
  • a narrow beam 3 is indicated in FIG. 1, which lies in the z, x plane and is scattered by the angle ⁇ with respect to the beam 2.
  • the wavelength of the beam 2 is advantageously of the order of magnitude of the dimensions of the cross section of the security thread 1, ie the authenticity check takes place in the so-called resonance range, in which neither the laws of geometrical optics exist the cemetery approximation is still applicable.
  • the dimensions of the cross section of the security thread 1 are preferably in the order of magnitude of the wavelength of infrared radiation, so that the authenticity check can be carried out by means of infrared radiation in the resonance range. It is also possible to use a relatively thick security thread 1 and still work in the resonance range, which, however, requires the use of far infrared or submilliter waves, which can be generated, for example, by means of a far infrared laser.
  • the diagram in FIG. 2 shows the intensity I of the scattered radiation in the far field as a function of the scattering angle ⁇ in the event that the security thread 1 is made of metal and the wavelength is equal to the thickness of the security thread.
  • the characteristic curve profile I ( ⁇ ) the authenticity features inherent in the cross-sectional shape of the security thread 1 can be checked with great certainty by measuring the angular distribution of the intensity I.
  • the security thread 1 can be embedded directly in a carrier 4 of a document 5 if the carrier 4 is made of a material that is permeable to the electromagnetic beam 2, e.g. made of infrared transparent plastic. In the case of a document whose carrier absorbs the beam 2 or scatters it very strongly, the security thread 1 can be embedded in a thin cover layer.
  • FIG. 4 shows a document 5 'which consists of a carrier 4', a film-shaped intermediate layer 6 and a cover layer 7.
  • a security thread 1 ' is embedded between the intermediate layer 6 and the cover layer 7.
  • the production and deposition of the security thread 1 ' is advantageously carried out according to known photolitho graphic process.
  • a groove with a characteristic cross-sectional shape is incorporated into the intermediate layer 6, the security thread 1 'is deposited in and next to the groove, for example by means of a vapor deposition method, and the cover layer 7 is then applied.
  • a laminated plastic film or a lacquer layer can serve as cover layer 7.
  • 8 means a radiation source which throws the electromagnetic beam 2 onto the security thread 1 of the document 5.
  • the characteristic angular distribution of the intensity of the scattered radiation scattered on the security thread 1 is indicated in FIG. 5 by a curve 9.
  • the radiation detectors 10 to 12 are connected to an electronic signal processing element: 16, which is based on the signals from the radiation detectors 10 to. 12 checks whether the beam 2 is scattered on the security thread 1 in a predetermined characteristic manner and, if applicable, emits a yes signal at its output.
  • a phase-sensitive detection electronics is advantageously used.
  • the cross-sectional shape of the security thread 1 is constant over at least a predetermined partial length, it is unnecessary to adjust the document 5 with respect to the position of the beam 2 in the longitudinal direction of the security thread 1.
  • the angular distribution of the intensity of the scattered radiation is measured in the arrangement according to FIG. 5 in reflection. Likewise, the angle distribution can be measured in transmission, for which it is only necessary to arrange the radiation source 8 on the side of the document 5 opposite the radiation detectors 10 to 12.
  • the angular distribution of the intensity of the scattered radiation is measured with the aid of Light guides 17 to 19, one end of which is arranged close to the surface of the document 5 and the other end of which opens at the radiation detectors 10 to 12. If the light guides 17 to 19 are brought close enough to the security thread 1, this arrangement allows the measurement of the angular distribution in the near field and is particularly advantageous for checking the authenticity of documents in which the security thread 1 is embedded in a diffusely scattering material.
  • a single light guide and a single radiation detector can be used.
  • the document 5 is moved in the direction perpendicular to the longitudinal direction of the security thread 1 along the mouth of the light guide and in the signal processing element the measured intensity curve is compared with stored target values.
  • the scattered radiation scattered on the security thread 1 strikes two angular separation elements 20, 21, each of which passes a narrow beam 22, 23 with an advantageously variable mean scattering angle ⁇ or ⁇ '.
  • the beam 22 passes through a deflection member 24, a path difference member 25 and a deflection member 26. and the beam 23 via deflection members 27, 28 to a superposition member 29, which combines the beams 22, 23 again.
  • the path difference element 25 generates a variable optical path difference ⁇ .
  • the combined beams 22, 23 fall on a radiation detector 30 which is connected to an electronic signal processing element 31.
  • the signal processing element 31 calculates the so-called contrast
  • from the maximum value and the minimum value of the intensity I I ( ⁇ ) the interference fringe.
  • This contrast is a variable that depends on the degree of coherence of the two beams 22, 23.
  • the measured degree of coherence is one Function of the scattering angles ⁇ and ⁇ 'and is compared in the signal processing element 31 with stored target values.
  • the document 5 is advantageously moved parallel to the longitudinal direction of the security thread 1 in order to form the mean value over at least a certain partial length of the security thread.
  • the degree of coherence measurement also enables reliable detection of the security thread 1 when it is embedded in a diffusely scattering material.
  • the so-called second order intensity correlation g (2) can also be measured, which also represents a measure of the degree of coherence.
  • the arrangement shown in Fig. 8 consists of a radiation source 8 'with variable wavelength ⁇ , a radiation detector 32 and a signal processing element 33.
  • a radiation source 8' e.g. a dye laser or a light source with a slit and gradient filter.
  • the radiation detector 32 separates a narrow beam 34 from the scattered radiation and detects its intensity, which is dependent on the scattering angle ⁇ and on the wavelength ⁇ .
  • the wavelength ⁇ of the beam 2 is varied, the dependence on the world length of the intensity of the beam 34, i.e. the dispersion, measured and compared in the signal processing element 33 with stored target values.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Printing Methods (AREA)
  • Paper (AREA)
EP81110619A 1981-04-16 1981-12-19 Document avec fil de sécurité et procédé pour le contrôle de sa validité Expired EP0064102B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2558/81 1981-04-16
CH2558/81A CH653459A5 (de) 1981-04-16 1981-04-16 Dokument mit einem sicherheitsfaden und verfahren zur echtheitspruefung desselben.

Publications (3)

Publication Number Publication Date
EP0064102A2 true EP0064102A2 (fr) 1982-11-10
EP0064102A3 EP0064102A3 (en) 1983-08-10
EP0064102B1 EP0064102B1 (fr) 1986-02-26

Family

ID=4236500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110619A Expired EP0064102B1 (fr) 1981-04-16 1981-12-19 Document avec fil de sécurité et procédé pour le contrôle de sa validité

Country Status (5)

Country Link
US (1) US4710627A (fr)
EP (1) EP0064102B1 (fr)
JP (1) JPS57178895A (fr)
CH (1) CH653459A5 (fr)
DE (1) DE3173935D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208573A1 (fr) * 1985-06-24 1987-01-14 ARJOMARI-PRIOUX Société anonyme dite Document de sécurité utilisant des fibres optiques et procédé d'authentification
WO1987001845A1 (fr) * 1985-09-19 1987-03-26 N.V. Bekaert S.A. Procede et appareil pour la verification de l'authenticite de documents et de documents utilises a cette fin
EP0682328A1 (fr) * 1994-05-11 1995-11-15 Unicate B.V. Dispositif de balayage

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60112481A (ja) * 1983-11-24 1985-06-18 Nippon Koovan Kk 文書の複写を防止する製品及びその製造方法
US4988875A (en) * 1988-12-13 1991-01-29 At&T Bell Laboratories Near infrared polyethylene inspection system and method
US4950905A (en) * 1989-02-06 1990-08-21 Xerox Corporation Colored toner optical developability sensor with improved sensing latitude
DE4429689C2 (de) * 1994-08-22 2003-06-26 Whd Elektron Prueftech Gmbh Prüfanordnung und Verfahren zur Prüfung von Dokumenten in Bearbeitungsmaschinen
US5790025A (en) * 1996-08-01 1998-08-04 International Business Machines Corporation Tamper detection using bulk multiple scattering
DE19703637C5 (de) * 1997-01-31 2004-09-30 Schwarz Druck Gmbh & Co Kg Echtheitsprüfsystem
US6552290B1 (en) * 1999-02-08 2003-04-22 Spectra Systems Corporation Optically-based methods and apparatus for performing sorting coding and authentication using a gain medium that provides a narrowband emission
US6473165B1 (en) * 2000-01-21 2002-10-29 Flex Products, Inc. Automated verification systems and methods for use with optical interference devices
US6290130B1 (en) * 2000-04-13 2001-09-18 Drexler Technology Corporation Anti-counterfeit authentication method for optical memory cards and hybrid smart cards
GB0025096D0 (en) * 2000-10-13 2000-11-29 Bank Of England Detection of printing and coating media
CA2416295A1 (fr) * 2001-03-27 2002-12-02 Kabushiki Kaisha Topcon Appareil detectant si une carte est vraie ou fausse
JP2002288604A (ja) * 2001-03-27 2002-10-04 Topcon Corp カードの真贋判定装置
US6970236B1 (en) 2002-08-19 2005-11-29 Jds Uniphase Corporation Methods and systems for verification of interference devices
DE10246563A1 (de) * 2002-10-05 2004-04-15 november Aktiengesellschaft Gesellschaft für Molekulare Medizin Vorrichtung und Verfahren zur Bestimmung der Farbe/n auf einer Oberfläche
JP4366104B2 (ja) * 2003-04-17 2009-11-18 日立オムロンターミナルソリューションズ株式会社 紙葉類判別装置
US20080203333A1 (en) * 2007-02-23 2008-08-28 Kabushiki Kaisha Toshiba Sheet discrimination apparatus and image forming apparatus
US7742171B2 (en) * 2007-08-06 2010-06-22 Ci Systems Ltd. Reflectivity/emissivity measurement probe insensitive to variations in probe-to-target distance
CN101519857B (zh) * 2008-02-29 2011-08-24 上海柯斯造纸防伪技术有限公司 激发光光角变化致荧光纤维变色的防伪纤维及防伪材料
DE102013216308A1 (de) * 2013-08-16 2015-02-19 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Prüfung eines Sicherheitselements eines Sicherheitsdokuments

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1929828A (en) * 1931-11-24 1933-10-10 Schlitz John Fraud-preventing paper
DE677711C (de) * 1932-10-05 1939-07-01 Oskar Denzler Dr Verfahren zur Herstellung von Sicherheitspapier, Banknoten, Dokumenten, Textilstoffen oder aehnlichen Werkstoffen mit Geheimkennzeichnung
GB1095286A (en) * 1963-07-08 1967-12-13 Portals Ltd Security device for use in security papers
DE2001944A1 (de) * 1970-01-16 1971-07-22 Siemens Ag Banknoten
DE2037755C3 (de) * 1970-07-30 1979-08-30 National Rejectors Inc. Gmbh, 2150 Buxtehude Vorrichtung zum Prüfen von Wertscheinen
DE2215628B1 (de) * 1972-03-30 1973-09-20 Ibm Deutschland Gmbh, 7000 Stuttgart Banknote oder Wertpapier mit Me tallsicherheitsfaden oder Kreditkarte mit Sicherheitsstreifen
US3766452A (en) * 1972-07-13 1973-10-16 L Burpee Instrumented token
CH581359A5 (fr) * 1974-10-01 1976-10-29 Grey Lab Establishment
GB1552853A (en) * 1976-09-24 1979-09-19 Bank Of England Authentication devices
GB1580951A (en) * 1977-03-01 1980-12-10 Bank Of England Security devices
US4306151A (en) * 1978-02-03 1981-12-15 Measurex Corporation Method of measuring the amount of substance associated with a material in the presence of a contaminant
DE3013238A1 (de) * 1980-04-03 1981-10-08 Agfa-Gevaert Ag, 5090 Leverkusen Sicherheitsfaden als schutz gegen faelschungen
JPS58175091A (ja) * 1982-04-06 1983-10-14 株式会社東芝 セキユリテイ・ストレツド検出装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208573A1 (fr) * 1985-06-24 1987-01-14 ARJOMARI-PRIOUX Société anonyme dite Document de sécurité utilisant des fibres optiques et procédé d'authentification
WO1987001845A1 (fr) * 1985-09-19 1987-03-26 N.V. Bekaert S.A. Procede et appareil pour la verification de l'authenticite de documents et de documents utilises a cette fin
EP0682328A1 (fr) * 1994-05-11 1995-11-15 Unicate B.V. Dispositif de balayage
NL9400782A (nl) * 1994-05-11 1995-12-01 Unicate Bv Aftastinrichting.
US5621219A (en) * 1994-05-11 1997-04-15 Unicate B.V. Device for scanning the geometrical pattern of a mark of an object

Also Published As

Publication number Publication date
US4710627A (en) 1987-12-01
EP0064102A3 (en) 1983-08-10
DE3173935D1 (en) 1986-04-03
CH653459A5 (de) 1985-12-31
JPS57178895A (en) 1982-11-04
EP0064102B1 (fr) 1986-02-26

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