WO1999001292A1 - Fil de securite - Google Patents

Fil de securite Download PDF

Info

Publication number
WO1999001292A1
WO1999001292A1 PCT/IB1998/000999 IB9800999W WO9901292A1 WO 1999001292 A1 WO1999001292 A1 WO 1999001292A1 IB 9800999 W IB9800999 W IB 9800999W WO 9901292 A1 WO9901292 A1 WO 9901292A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
piezoelectric
security thread
security
layers
Prior art date
Application number
PCT/IB1998/000999
Other languages
English (en)
Inventor
Brian Chorley
Richard Hunter Brown
Joseph Francis Yaskowski
Original Assignee
Measurement Specialties, Inc.
The Governor And Company Of The Bank Of England
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 Measurement Specialties, Inc., The Governor And Company Of The Bank Of England filed Critical Measurement Specialties, Inc.
Priority to DE69804972T priority Critical patent/DE69804972T2/de
Priority to AU77844/98A priority patent/AU7784498A/en
Priority to EP98925886A priority patent/EP1007371B1/fr
Priority to CA002337787A priority patent/CA2337787A1/fr
Priority to AT98925886T priority patent/ATE216321T1/de
Publication of WO1999001292A1 publication Critical patent/WO1999001292A1/fr

Links

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. Further advantageous aspects of the invention are set forth in the claims, or will be apparent from the following description and drawings.
  • 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; and 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 is also possible to provide 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/tetrafluoritheylene 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 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.
  • piezoelectric material such as PVDF
  • PVDF charge piezoelectric material
  • FIG 4 schematically illustrates the dipole orientation in a portion of polymeric piezoelectric layer.
  • the horizontal dipoles 20 indicate a non-piezoelectric area and the vertical dipoles 21, 22 represent respectively negative and positively poled areas.
  • 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)

Abstract

L'invention concerne un fil de sécurité (2), pour l'identification de documents de sécurité tels que des billets de banque, comporte une couche magnétique (4) prise en sandwich entre des couches polymères (6, 8) dont une (8) est une couche piézoélectrique, par exemple en PVDF. La couche piézoélectrique (8) peut être polarisée par intermittence de sorte qu'elle soit codée. On produit ainsi un fil de sécurité particulièrement compact à caractéristiques codées multiples améliorées.
PCT/IB1998/000999 1997-06-30 1998-06-29 Fil de securite WO1999001292A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69804972T DE69804972T2 (de) 1997-06-30 1998-06-29 Sicherheitsfaden
AU77844/98A AU7784498A (en) 1997-06-30 1998-06-29 Security thread
EP98925886A EP1007371B1 (fr) 1997-06-30 1998-06-29 Fil de securite
CA002337787A CA2337787A1 (fr) 1997-06-30 1998-06-29 Fil de securite
AT98925886T ATE216321T1 (de) 1997-06-30 1998-06-29 Sicherheitsfaden

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9713850.7A GB9713850D0 (en) 1997-06-30 1997-06-30 Security thread
GB9713850.7 1997-06-30

Publications (1)

Publication Number Publication Date
WO1999001292A1 true WO1999001292A1 (fr) 1999-01-14

Family

ID=10815182

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/000999 WO1999001292A1 (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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2332645A (en) * 1997-12-19 1999-06-30 Amp Gmbh Piezoelectric security thread detection apparatus
EP1059620A1 (fr) * 1999-06-08 2000-12-13 BUNDESDRUCKEREI GmbH Caractéristiques de securité basées sur l'effet piézo pour des documents de valeur ou de securité et leur détection
GB2375078A (en) * 2001-04-30 2002-11-06 Rue De Int Ltd Security substrate with indicia only viewable in transmitted light
US20100084850A1 (en) * 2006-10-04 2010-04-08 Wayne Kevin Jackson Security document containing an authentication device
KR100954885B1 (ko) * 2007-12-03 2010-04-28 한국조폐공사 기기감지용 압전성 은선 및 이를 포함하는 유가증권 용지

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5566982A (en) * 1993-07-16 1996-10-22 Idmatics S. A. Flexible card with validity checking device
WO1997007478A1 (fr) * 1995-08-14 1997-02-27 The Whitaker Corporation Dispositif permettant de deceler la presence d'un corps piezo-electrique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5566982A (en) * 1993-07-16 1996-10-22 Idmatics S. A. Flexible card with validity checking device
WO1997007478A1 (fr) * 1995-08-14 1997-02-27 The Whitaker Corporation Dispositif permettant de deceler la presence d'un corps piezo-electrique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2332645A (en) * 1997-12-19 1999-06-30 Amp Gmbh Piezoelectric security thread detection apparatus
GB2332645B (en) * 1997-12-19 2001-08-29 Amp Gmbh Method of detecting a piezoelectric security thread
EP1059620A1 (fr) * 1999-06-08 2000-12-13 BUNDESDRUCKEREI GmbH Caractéristiques de securité basées sur l'effet piézo pour des documents de valeur ou de securité et leur détection
DE19926010A1 (de) * 1999-06-08 2000-12-14 Bundesdruckerei Gmbh Piezo-Effekt-basiertes Sicherheitsmerkmal an Wert- und Sicherheitsdokumenten und dazugehöriges Nachweisverfahren
DE19926010C2 (de) * 1999-06-08 2003-01-30 Bundesdruckerei Gmbh Wert- und Sicherheitsdokument mit Sicherheitsmerkmal mit Piezo-Effekt-basierten Eigenschaften und dazugehöriges Nachweisverfahren
US6659351B1 (en) * 1999-06-08 2003-12-09 Bundesdruckerei Gmbh Electric effect-based security feature on security documents and on documents of value-proof process belonging thereto
GB2375078A (en) * 2001-04-30 2002-11-06 Rue De Int Ltd Security substrate with indicia only viewable in transmitted light
US20100084850A1 (en) * 2006-10-04 2010-04-08 Wayne Kevin Jackson Security document containing an authentication device
US10052904B2 (en) * 2006-10-04 2018-08-21 Note Printing Australia Limited Security document containing an authentication device
KR100954885B1 (ko) * 2007-12-03 2010-04-28 한국조폐공사 기기감지용 압전성 은선 및 이를 포함하는 유가증권 용지

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
EP1007371B1 (fr) 2002-04-17
DE69804972T2 (de) 2002-11-28
AU7784498A (en) 1999-01-25

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