EP1007371B1 - Fil de securite - Google Patents

Fil de securite Download PDF

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Publication number
EP1007371B1
EP1007371B1 EP98925886A EP98925886A EP1007371B1 EP 1007371 B1 EP1007371 B1 EP 1007371B1 EP 98925886 A EP98925886 A EP 98925886A EP 98925886 A EP98925886 A EP 98925886A EP 1007371 B1 EP1007371 B1 EP 1007371B1
Authority
EP
European Patent Office
Prior art keywords
layer
piezoelectric
security thread
security
layers
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.)
Expired - Lifetime
Application number
EP98925886A
Other languages
German (de)
English (en)
Other versions
EP1007371A1 (fr
Inventor
Brian Chorley
Richard Hunter Brown
Joseph Francis Yaskowski
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.)
Governor and Co of Bank of England
Measurement Specialties Inc
Original Assignee
Governor and Co of Bank of England
Measurement Specialties Inc
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
Application filed by Governor and Co of Bank of England, Measurement Specialties Inc filed Critical Governor and Co of Bank of England
Publication of EP1007371A1 publication Critical patent/EP1007371A1/fr
Application granted granted Critical
Publication of EP1007371B1 publication Critical patent/EP1007371B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B42D25/355—Security threads

Definitions

  • This invention relates to a security thread for protecting documents, banknotes, or identification cards against forgery.
  • a security thread comprising a magnetic layer sandwiched between protective layers, wherein at least one of the protective layers is a piezoelectric polymer.
  • a particularly compact and cost-effective security thread is provided with enhanced security features.
  • the magnetic material may be coded as is typical for conventional security threads, wherein the piezoelectric polymer layer may also have a series of juxtaposed poled and unpoled regions.
  • the poled and unpoled regions may form a binary code such that both the magnetic and the piezoelectric layers have coding means; the magnetic layer being readable by a magnetic head, and the piezoelectric layer readable by a conductor or capacitive receptor after stimulation of the piezoelectric poled regions by mechanical (e.g. ultrasound) or pyroelectric (e.g. infrared rays) transmitters.
  • mechanical e.g. ultrasound
  • pyroelectric e.g. infrared rays
  • On either side of the magnetic layer there may be provided a metallisation layer, one of the metallisation layers thus being sandwiched between the magnetic layer and the piezoelectric layer and forming an electrode for the piezoelectric poled regions, in particular forming the ground electrode.
  • the metal layer is reflective to light thereby concealing the magnetic layer, and forms a base for printing characters that can be read when light is passed through the metallisation layer.
  • Compound security measures can thus be provided in a particularly compact security thread, requiring various detection means that enhances security against forgery.
  • Figure 1 is a cross-sectional view through a security thread according to this invention, the thread shown partially laminated;
  • Figure 2 is a view similar to Figure 1 different embodiment according to this invention.
  • Figure 3 is a simple schematic view representing dipoles in a portion of piezoelectric layer taken in cross-section.
  • Figure 4 is a simple schematic view illustrating how a piezoelectric layer is polarised.
  • a security thread 2 is shown in longitudinal cross-section.
  • the security thread may be of substantially similar shape and dimension as a conventional security thread embedded in banknotes or security documents, for example in the form of a thin elongate thread traversing a banknote.
  • the security thread 2 comprises a magnetic layer 4 sandwiched between polymeric layers 6, 8 either side of the magnetic layer 4.
  • the polymeric layers 6, 8 may be of different materials, for example a first layer 6 being of simple polyester or other flexible plastic material, and the second layer 8 being of a piezoelectric material such as polyvinyldene fluoride (PVDF) or other piezo electric polymeric material.
  • PVDF polyvinyldene fluoride
  • the second layer 8 as a simple flexible plastic layer such as polyester, coded or printed on one side thereof with a piezoelectric material such as polymer(VDF/TrVE) or vinylidene/tetrafluorethylene co-polymer (VDF/TFE).
  • a piezoelectric material such as polymer(VDF/TrVE) or vinylidene/tetrafluorethylene co-polymer (VDF/TFE).
  • the flexible polymeric layers 6, 8 are also protective layers that support and protect the magnetic layer 4 therebetween from mechanical damage.
  • the magnetic layer 4 may be coded magnetically along its length (direction L) such that each security thread has a distinctive magnetic code readable by a detection device having a magnetic head.
  • the magnetic layer 4 is shown in Figures 1 and 2 as a layer separately laminated between the polymeric layers 6, 8, but the magnetic layer may also be printed or deposited otherwise on one of the polymeric support layers 6, 8, for example the simple polymeric (polyester) layer 6.
  • the polymeric layer 6 with the deposited magnetic layer 4 would then be bonded to the other polymeric layer 8 by means of a conventional adhesive.
  • a metallisation layer 10 is provided between the magnetic layer 4 and the piezoelectric layer 8.
  • the metallisation layer 10 may be deposited on the piezoelectric layer 8 by sputtering or other conventional metal deposition methods for deposing metals on substrates or the like.
  • the metallisation may also be etched in certain places to form characters that are readable when light is shone through the security thread.
  • the electrode 10 further acts as a ground electrode for contacting an inner side 11 of the piezoelectric layer 8 to ground, the opposing other side 12 of the piezoelectric layer 8 being readable by a detection device, for example a conductive member biased thereagainst.
  • a detection device for example a conductive member biased thereagainst.
  • the electrical charge that develops can either be read by an electrical detector connected to the ground electrode 10 and the charge electrode layer 12, or by capacitive detection means that responds to the electrical field created by the electrical charges.
  • Piezoelectric materials such as PVDF also have a pyroelectric effect, whereby when subject to heat (for example from a light source emitting infrared) the heating of the piezoelectric creates an electric potential between the opposed layers 11, 12. Detection of the pyroelectric effect may for example be effected by the detection device described in International Application WO 97/07478.
  • the polymeric layer 6 may also be provided with a metallisation layer 14 on its inner side 15.
  • This metallisation layer may similarly be provided with characters.
  • the piezoelectric layer 8 is substantially uniformly charged (poled) piezoelectrically along the whole length thereof.
  • the piezoelectric layer 8 is provided with a series of poled regions 16 and unpoled regions 18.
  • the poled and unpoled regions may have lengths that are multiples of a smallest bit length, as depicted in Figure 2 by the poled region 19, such that the piezoelectric layer 8 has a binary code extending along its length L.
  • a conductive or capacitive detector can pick up the electrically charged areas along the length, thereby reading the binary code.
  • the coded piezoelectric layer 8 of the embodiment of Figure 2 can be made by positioning a ground electrode 24 against one side of the layer 8 (for example the metallised ground layer 10) and positioning charge electrodes 26 on the charge side 12 of the layer 8.
  • the charge electrodes 26 may be provided with a high positive or negative voltage depending on whether positive poled regions or negative poled regions are desired.
  • the charge electrodes 26 may be held together in a single structure, with a dieletric (such as a ceramic or air) separating the poling regions.
  • the electrodes may be provided on a rotating drum, the grounded electrode forming a opposed rotating drum with the piezoelectric layer sandwiched therebetween such that a continuous lamination of the piezoelectric layer 8 with piezoelectric poling can be effected.
  • the first polymeric layer 6 may also be a piezoelectric layer, for example charged with a binary code that may either differ from the binary code of the layer 8 as indicated by the piezoelectric charged regions 16' and immediate non-charged regions 18'. It is also possible to provide the first layer 6 with the same binary code as the second layer 8 to enhance the reliability in the event one of the layers is defective.
  • the second metallisation layer 14 could also act as the ground electrode for the piezoelectric layer 6 in a similar manner to the ground electrode for the piezoelectric layer 8.
  • a particularly compact security thread with enhanced security is thus provided.
  • the means of detecting the security thread based on different physical effects such as the magnetic field of the magnetic layer 4 and the electrical field or potential differences of the piezoelectric layer or layers 6, 8, significantly increases difficulty of forgery.

Landscapes

  • Medicinal Preparation (AREA)
  • Materials For Medical Uses (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Credit Cards Or The Like (AREA)
  • Laminated Bodies (AREA)

Claims (6)

  1. Fil de sécurité (2) comprenant une couche magnétique (4) comprise entre les couches de protection (6, 8), caractérisé en ce qu'au moins une des couches de protection (6, 8) comprend un polymère piézoélectrique.
  2. Fil de sécurité (2) selon la revendication 1, dans lequel la couche polymère piézoélectrique comporte des régions polarisées (16) et non polarisées (18) formant un code binaire ou tertiaire.
  3. Fil de sécurité (2) selon les revendications 1 ou 2, dans lequel une paire de couches de protection (6, 8), positionnées de part et d'autre de la couche magnétique (4) est en polymère piézoélectrique.
  4. Fil de sécurité (2) selon la revendication 3, dans lequel chacune des couches piézoélectriques comporte des régions polarisées et des régions non polarisées.
  5. Fil de sécurité (2) selon l'une quelconque des revendications précédentes, dans lequel le fil comprend en outre une couche métallique (10) entre la couche polymère piézoélectrique (8) et la couche magnétique (4).
  6. Fil de sécurité (2) selon la revendication 5, dans lequel la couche métallique (10) agit comme électrode de masse pour la couche piézoélectrique (8).
EP98925886A 1997-06-30 1998-06-29 Fil de securite Expired - Lifetime EP1007371B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9713850 1997-06-30
GBGB9713850.7A GB9713850D0 (en) 1997-06-30 1997-06-30 Security thread
PCT/IB1998/000999 WO1999001292A1 (fr) 1997-06-30 1998-06-29 Fil de securite

Publications (2)

Publication Number Publication Date
EP1007371A1 EP1007371A1 (fr) 2000-06-14
EP1007371B1 true EP1007371B1 (fr) 2002-04-17

Family

ID=10815182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98925886A Expired - Lifetime EP1007371B1 (fr) 1997-06-30 1998-06-29 Fil de securite

Country Status (7)

Country Link
EP (1) EP1007371B1 (fr)
AT (1) ATE216321T1 (fr)
AU (1) AU7784498A (fr)
CA (1) CA2337787A1 (fr)
DE (1) DE69804972T2 (fr)
GB (1) GB9713850D0 (fr)
WO (1) WO1999001292A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2332645B (en) * 1997-12-19 2001-08-29 Amp Gmbh Method of detecting a piezoelectric security thread
DE19926010C2 (de) * 1999-06-08 2003-01-30 Bundesdruckerei Gmbh Wert- und Sicherheitsdokument mit Sicherheitsmerkmal mit Piezo-Effekt-basierten Eigenschaften und dazugehöriges Nachweisverfahren
GB2375078A (en) * 2001-04-30 2002-11-06 Rue De Int Ltd Security substrate with indicia only viewable in transmitted light
MX2009003560A (es) * 2006-10-04 2009-06-23 Australia Reserve Bank Documento de seguridad que contiene un dispositivo de autentificacion.
KR100954885B1 (ko) * 2007-12-03 2010-04-28 한국조폐공사 기기감지용 압전성 은선 및 이를 포함하는 유가증권 용지
US8212473B2 (en) 2009-04-22 2012-07-03 Simon Fraser University Flexible polymeric light emitting/charge storage device and system
US8253536B2 (en) 2009-04-22 2012-08-28 Simon Fraser University Security document with electroactive polymer power source and nano-optical display
US10414194B2 (en) * 2013-11-08 2019-09-17 Bank Of Canada Optically variable devices, their production and use

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707781B1 (fr) * 1993-07-16 1995-09-01 Idmatic Sa Carte souple équipée d'un dispositif de contrôle de validité.
GB9516503D0 (en) * 1995-08-14 1995-10-11 Amp Great Britain Apparatus for detecting presence of piezo electric material

Also Published As

Publication number Publication date
CA2337787A1 (fr) 1999-01-14
GB9713850D0 (en) 1997-09-03
ATE216321T1 (de) 2002-05-15
EP1007371A1 (fr) 2000-06-14
DE69804972D1 (de) 2002-05-23
WO1999001292A1 (fr) 1999-01-14
DE69804972T2 (de) 2002-11-28
AU7784498A (en) 1999-01-25

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