EP0848356A1 - Substrat enthaltend magnetische Partikeln, Sicherheitsdokument und Verfahren zu deren Detektion - Google Patents

Substrat enthaltend magnetische Partikeln, Sicherheitsdokument und Verfahren zu deren Detektion Download PDF

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Publication number
EP0848356A1
EP0848356A1 EP96402721A EP96402721A EP0848356A1 EP 0848356 A1 EP0848356 A1 EP 0848356A1 EP 96402721 A EP96402721 A EP 96402721A EP 96402721 A EP96402721 A EP 96402721A EP 0848356 A1 EP0848356 A1 EP 0848356A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
substrate
anyone
particles
ranging
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.)
Withdrawn
Application number
EP96402721A
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English (en)
French (fr)
Inventor
Paul PA Consulting Group Robertson
Jon PA Consulting Group Burrell
John PA Consulting Group Fischer
Pierre Doublet
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.)
ArjoWiggins SAS
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ArjoWiggins SAS
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 ArjoWiggins SAS filed Critical ArjoWiggins SAS
Priority to EP96402721A priority Critical patent/EP0848356A1/de
Priority to US08/987,047 priority patent/US5992741A/en
Priority to ARP970105815A priority patent/AR009662A1/es
Priority to EP97954829A priority patent/EP0897569B1/de
Priority to DE69712614T priority patent/DE69712614T2/de
Priority to CNB971922276A priority patent/CN100403342C/zh
Priority to SI9730364T priority patent/SI0897569T1/xx
Priority to HU9902281A priority patent/HU225074B1/hu
Priority to PT97954829T priority patent/PT897569E/pt
Priority to PL328599A priority patent/PL191795B1/pl
Priority to RU98117129/12A priority patent/RU2200977C2/ru
Priority to AU62063/98A priority patent/AU732892B2/en
Priority to IDW980062A priority patent/ID20296A/id
Priority to TR1998/01561T priority patent/TR199801561T1/xx
Priority to ES97954829T priority patent/ES2176817T3/es
Priority to CA002246304A priority patent/CA2246304C/en
Priority to CZ982517A priority patent/CZ251798A3/cs
Priority to UA98094783A priority patent/UA64709C2/uk
Priority to DK97954829T priority patent/DK0897569T3/da
Priority to JP52625698A priority patent/JP4467646B2/ja
Priority to SK1061-98A priority patent/SK285298B6/sk
Priority to BRPI9707632-5A priority patent/BR9707632B1/pt
Priority to AT97954829T priority patent/ATE217721T1/de
Priority to PCT/EP1997/007340 priority patent/WO1998026379A2/en
Publication of EP0848356A1 publication Critical patent/EP0848356A1/de
Priority to JP2009184152A priority patent/JP2009277244A/ja
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • 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
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint

Definitions

  • the present invention relates to a method and an apparatus for detecting the presence of particles in a substrate the base material of which has electromagnetic properties substantially differing from the corresponding electromagnetic properties of the particles.
  • the invention also relates to the particles and to the substrate comprising such particles which allow to recognise easily a document as being a genuine security document in order to prevent the document from being copied or in order to contribute to its authentication.
  • the invention is intended primarily to be used in the identification or authentication of all type of security documents having a paper or synthetic base material such as bank notes, cheques, passports, credit-cards, tickets, lottery-tickets and bonds which comprise the above particles, but it is also applicable to other applications in which objects need to be recognised.
  • the prior art has also proposed to add to the fibrous structure of the base material of the substrate or to the surface of the document one or more security elements allowing the identification and/or making difficult the manufacturing of the document.
  • US-A-4 114 032 (priority date 1973) and US-A-4 218 674 (filing date 1975) disclose a similar system where the security documents have fibres which are coated with a magnetic or magnetizable material embedded therein.
  • the mere presence of the magnetic fibres inside the security documents is tested or, as an improved feature, the distribution of the magnetic fibres in the security document is measured so that every single security document can be given a unique mark.
  • EP-A-0 625 766, EP-A-0 632 398 and EP-A-0 656 607 disclose a system where the fibres consist of magnetic powder as core of a polymer sheath. Magnetic detection is done by DC current used to excite a coil. Because of magnetic prehistory or disturbing of magnetic fields or deformations of the security documents, however, the repetitivity of such a magnetic scanning system is not ensured and accurate discrimination between genuine security documents and counterfeit documents is not always guaranteed. So detection is not always distinctive. Furthermore, if characters on the security document have been printed by means of a magnetic ink which is detectable by means of a sorting apparatus, there may be interference between the magnetic fibres and the magnetic ink of the characters.
  • FR 2 425 937 discloses a method of dispersing metallic fibres, more particularly stainless steel fibres, inside the fibrous structure of paper in order to allow the identification by means of microwaves.
  • US-A-4 820 912 discloses an alternative system where the security documents comprise randomly distributed electrically conductive fibres.
  • the unique distribution of the fibres inside the security document can be obtained. Up to 64 320 different possible combinations of the mark characterising this distribution can be obtained.
  • Application of this microwave technique to reproduction apparatus such as photocopying apparatus in order to prevent security documents from being copied, such as disclosed in WO-A- 95/24000 (priority date 1994) fails to distinguish security documents from printed circuit boards (PCB's) or from greeting cards having decorative metal foils on its surface.
  • PCB's printed circuit boards
  • greeting cards having decorative metal foils on its surface.
  • the system does not discover the presence of the fibres if a metal plate is put above a genuine security document.
  • a method for detecting the presence of magnetic elongated particles in a substrate the base material of which has magnetic properties substantially differing from the corresponding magnetic properties of the elongated particles.
  • the base material is made of a non-magnetic material.
  • the elongated particles have such a long and thin form that their demagnetisation factor N is smaller than 1/250, preferably 1/1000.
  • Their cross-sectional diameter is smaller than 30 micrometer and their magnetic saturation field H s ranges from 100 to 1000 A/m.
  • the method comprises following steps :
  • EAS electronic article surveillance
  • the signals which can be obtained from this approach are very distinctive and the electronics and signal processing can be straight forward.
  • EAS systems have been disclosed in an extensive way in the patent literature. Some examples are FR 763 681 (filing date 1933), US-A-3 631 442 (filing date 1967), US 3 990 065 (filing date 1975) and EP-A-0 153 286 (priority date 1984).
  • anti-theft labels are used to trigger alarms at the exit areas of shops if the products have not been offered at the pay-desk.
  • the exit area of a shop is much larger than the volume required for detection of magnetic elongated particles in security documents.
  • a typical exit gate has a width of about 1 m, while in the present invention distances of only a few cm between the magnetic field and the magnetic elongated particles are sufficient to perform the detection. This basic difference leads to a number of properties which are different for application of the present invention :
  • the method comprises the additional step of :
  • a detection apparatus for detecting the presence of magnetic elongated particles in a substrate the base material of which has magnetic properties substantially differing from the corresponding magnetic properties of the elongated particles.
  • the base material is made of a non-magnetic material.
  • the elongated particles have such a long and thin form that their demagnetisation factor N is smaller than 1/250, preferably smaller than 1/1000. Their cross-sectional diameter is smaller than 30 micrometer and their magnetic saturation field H s ranges from 100 to 1000 A/m.
  • the apparatus comprises :
  • the apparatus according to the second aspect of the present invention can be used in automatic vending machines, bank note counting machines and reproduction apparatus.
  • a magnetic elongated particle for being incorporated in a base material of a s0ubstrate where the base material has magnetic properties differing substantially from the corresponding magnetic properties of the particle.
  • the base material is made of a non-magnetic material.
  • the particle has such a long and thin form that its demagnetisation factor N is smaller than 1/250, preferably smaller than 1/1000.
  • the diameter of the particle i.e. its maximum cross-sectional dimension
  • N [ln (2p - 1)]/p 2 where p is the length to diameter ratio.
  • N is equal to 1/22000.
  • the magnetic saturation flux B s of the magnetic elongated particle ranges from 0.1 to 1 Tesla, preferably from 0.1 to 0.5 Tesla.
  • the magnetic dynamic permeability ⁇ r ' of the magnetic elongated particle ranges from 100 to 10000.
  • the magnetic dynamic permeability ⁇ r ' is herein defined as the ratio of the saturation flux B s to the magnetic field Hs at saturation multiplied by the constant ⁇ o or, if the elongated particles do not saturate, the same ratio at the maximum field used in the magnetometer (1000 A/m).
  • magnetic elongated particle refer to an elongated particle itself made of a magnetic material and possibly being coated or encapsulated with a non-magnetic material or to a elongated particle being made of a non-magnetic material being coated or encapsulated with a magnetic material.
  • the thickness of the coating may range from 1 to 5 micrometer.
  • the magnetic material can be made starting from an alloy comprising components chosen among Fe, Co, Cr, Ni, Cu, Mo, Mn, Nb, B, V, Si and P and more particularly Ni, Fe, Mo, Mn, Cu.
  • Soft magnetic materials have been disclosed for example in EP-A-0 295 028 and in US-A-4 298 262.
  • a suitable alloy composition responds to the general formula : Ni a Fe b C o Cr c Cu e Mo f Mn g P h Nb i B j V k Si l wherein a to l represent integers.
  • alloy compositions have 52 to 85 % of nickel (Ni) and varying amounts of other components and more particularly 5 to 20 % of Fe.
  • compositions are:
  • compositions are commercialised under names as ⁇ -metal, Permafi, Permalloy, Supermalloy, Vitrovac and Metglas.
  • non-magnetic and non-metallic material glass, carbon or synthetic material such as polymers especially polypropylene and polyethylene can be mentioned.
  • the elongated particle is a fibre which can be a metallic fibre, or a non-metallic fibre coated with a magnetic substance.
  • the fibres can be uniformly distributed all over the substrate and therefore not easily missed by the detection system.
  • the fibres can be uniformly and individually dispersed inside the base material of the substrate in order to prevent the formation of agglomerates of fibres.
  • Magnetic fibres inside the fibrous structure of the paper may form a magnetic "mass" which is at least double as great as the magnetic mass of the characters in magnetic ink and may confuse completely the lecture of these characters. Additionally, since the fibres are dispersed inside the substrate, they are not easily removable by the counterfeiters who would like to remove them before making a photocopy and reinstate them inside the substrate after photocopy thereof.
  • the fibres are preferably hard drawn or work hardened metal fibres, e.g. manufactured according to the technique of bundled-drawing which is well known as such. This manufacturing technique has the advantage of yielding a much higher production rate than hot melt production techniques.
  • the inventors have found that the effective permeability of the hard drawn fibres can be doubled by annealing. This skill keeps the saturation field Hs sufficiently high, but makes the fibres more sensitive.
  • the magnetic elongated particles may also be amorphous metal fibres.
  • a substrate comprising a base material and elongated particles inside the base material.
  • the magnetic properties of the elongated particles differ from the corresponding magnetic properties of the base material.
  • the base material is made of a non-magnetic material.
  • the elongated particles have such a long and thin form that their demagnetisation factor N is smaller than 1/250, preferably smaller than 1/1000. Their diameter is smaller than 30 micrometer and their magnetic saturation field ranges from 100 to 1000 A/m.
  • the base material is a non-magnetic material such as a fibrous structure like paper, paper or plastic.
  • the particles have a magnetic saturation flux ranging from 0.1 to 1 Tesla preferably from 0.1 to 0.5 Tesla and a magnetic dynamic permeability ⁇ r ' ranging from 100 to 10000.
  • the magnetic elongated particles have a D.C. magnetic remanence smaller than 0.3 Tesla.
  • the magnetic elongated particles, especially the fibres have a mean cross-sectional diameter ranging from 1 to 30 micrometer particularly from 5 to 15 micrometer and a length ranging from 1 to 20 mm, preferably from 2 to 10 mm.
  • the elongated particles are hard drawn or work hardened metal fibres, but can also be amorphous metal fibres.
  • the magnetic elongated particles can be made of an alloy comprising components chosen among Ni, Fe, Cu, Cr, Co, Mo, Mn, Nb, B, V, Si and P, and more particularly Fe, Ni, Mo, Mn, Cu.
  • the base material of the substrate can be made of paper or of a synthetic material, especially plastic as polypropylene or polyethylene.
  • the magnetic particles can also be made of magnetic and non-magnetic material.
  • the substrate according to the fourth aspect of the present invention has a quantity of magnetic elongated particles ranging from 0.1 to 5 per cent, most preferably from 0.5 to 1.5 per cent by weight relative to the weight of said substrate.
  • the elongated particles, especially the fibres have a colour near to the colour of the base material.
  • a covering or a coating providing to the fibres the wished colour.
  • a method of depositing such a coating has been disclosed in French patent application FR 95 02868 and in international application PCT/FR/96 00390.
  • the present invention provides security documents comprising said magnetic elongated particles uniformly dispersed inside said substrate, said substrate comprising a paper or plastic sheet. More particularly the magnetic elongated particles are made of metallic fibres, the quantity of magnetic fibres in said substrate ranging from 0,2 to 2 %, the substrate being a paper sheet, especially of 20 to 300 ⁇ m of thickness, preferably banknotes of 80 to 120 ⁇ m.
  • Reference number 10 in FIGURE 1 refers to a B-H curve of an EAS label which can be designated as "very soft magnetic". It is characterised by a very low saturation field H s and a rather high level of magnetic dynamic permeability.
  • Reference number 12 refers to a B-H curve of a magnetic elongated particle which is to be embedded in a substrate according to the present invention. Although being also a soft magnetic material, it is not that "very soft" as is an EAS label. The saturation field H' s is higher and the corresponding values of an EAS label.
  • Reference number 14 refers to the B-H curve of a mild steel plate clearly showing a saturation field H'' s that is much larger than H s and H' s .
  • FIGURE 1 It will be clear from FIGURE 1 that the low magnetic fields applied in EAS systems to saturate the EAS labels do not saturate the magnetic particles according to the present invention and do not trigger the alarm systems in shops. It will also be clear from FIGURE 1 that magnetic fields applied in the present invention to saturate the magnetic particles are still in the linear part of a B-H curve of a mild steel and will not create the same series of higher harmonics. This difference can be used in order to discriminate between the two types of materials and even to detect the marker tag in the presence of large Ferro-magnetic objects.
  • the magnetic metal fibre had an a.c. remanence of 0.3 Tesla in the measurement. In practice the d.c. remanence would be lower than this so that no significant electromagnetic noise signals are generated which interfere with other magnetic code systems. In particular, the fibres did not give any significant signal with a standard magnetic character reader reading characters made in magnetic inks. In other words, using the measurement method and definition of maximum residual signal levels as defined in the International Standard for magnetic ink character recognition, ISO 1004, the effect of remanent flux is acceptable.
  • the base frequency and the detection frequency or frequencies can be selected to maximise the signal from the particular fibre marker and minimise signals from other common objects and signals generated from the apparatus in which the system is installed.
  • the invention system provides a good discrimination between a security document with magnetic elongated particles and paper, books, hands, printed circuit boards, foil greeting cards, non metallic bindings of documents, spiral metal bindings of documents, paper clips, metal plates and photocopier lid materials.
  • a security document lying under a non-magnetic metal plate could be easily identified (this in great contrast with a microwave system where the metal plate conceals the magnetic fibres for the microwaves).
  • a suitable drive and detection circuit is shown in FIGURE 2.
  • a resonant drive power oscillator 16 is used to minimise harmonic generation and the oscillator 16 is driven by a frequency which is divided down from the selected harmonic.
  • the 19th harmonic of 20 kHz, at 380 kHz may be a good choice as it gives good signals from fibres with very small signals from common Ferro-magnetic materials such as mild steel.
  • the oscillator 16 generates an electrical source signal which is fed to a drive coil 18 which transforms the electrical source signal into a magnetic drive signal.
  • a detection coil 20 suitably arranged with respect to the drive coil 18, detects any field emanating from magnetic particles and transforms this into an electrical detection signal.
  • a high pass filter 22 is used to reduce the fundamental frequency, as this can be coupled between the coils by conducting metals and overload the amplifiers.
  • a phase sensitive detector 24 is used to provide good signal-to-noise ratio.
  • Oscillator 26 operates at the frequency of the selected harmonic, and frequency divider 28 divides the frequency in order to obtain the base frequency.
  • Other high harmonics are also suitable and it is an advantage to combine several to derive the final detection signal.
  • FIGURE 3 illustrates how the drive coil 18 may be advantageously arranged with respect to the detection coil 20.
  • the direction of the magnetic field generated by the drive coil is shown in hatched lines, except for that part of the magnetic field that goes through the detection coil 20, which is shown by means of arrows 30 and 32.
  • Drive coil 18 and detection coil 20 partially overlap and are so arranged that the part of the magnetic flux which goes in one direction (arrow 30) through detection coil 20 is almost equal to the part of the flux which goes in the other direction (arrow 32) in order to null-out the drive field in the detection coil whilst providing a region above the overlapping coils in which the magnetic field is effective in coupling into the magnetic particles.
  • An equivalent nulling effect could also be provided electronically by a negative feed back of a fundamental frequency.
  • FIGURE 4, FIGURE 5 and FIGURE 6 all show embodiments of arrangement of drive coil and detection coil to be used in reproduction apparatus such as high-resolution colour photocopying apparatus.
  • the arrangement is such that a bank note with a width of only 7 cm can be detected on a scanning area of 21 cm x 29.7 cm (if it comprises magnetic particles).
  • FIGURE 4 four pairs of a drive coil 18 with a detection coil 20 are arranged on a suitable carrier 34 at regular distances along the width of the scanning area so that the presence of any genuine bank note will be detected irrespective of its position on the scanning area.
  • a plurality of drive coils 18 and a plurality of detection coils 20 form a daisy chain wherein a drive coil 18 is alternated with a detection coil 20 and vice versa.
  • the drive coil 18 takes the form of an elongated eight with the height of the eight equal to the width of the scanning area.
  • the detection coil takes the form of an elongated ellipse with the length of the longitudinal axis equal to the width of the scanning area.
  • Drive coil 18 and detection coil 20 are arranged one above the other so that here also the part of the magnetic flux which goes in one direction through detection coil 20 is almost equal to the part of the flux which goes in the other direction in order to null-out the drive field in the detection coil.
  • FIGURE 6 shows for didactical reasons a drive coil 18 and a detection coil 20 at a distance apart from each other, but they are to be arranged next to one another.
  • FIGURE 7 shows schematically an embodiment with only one drive coil 18 and four detection coils 20 so arranged that the drive magnetic field balances out in detection coils 20.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Paints Or Removers (AREA)
  • Cosmetics (AREA)
EP96402721A 1996-12-12 1996-12-12 Substrat enthaltend magnetische Partikeln, Sicherheitsdokument und Verfahren zu deren Detektion Withdrawn EP0848356A1 (de)

Priority Applications (25)

Application Number Priority Date Filing Date Title
EP96402721A EP0848356A1 (de) 1996-12-12 1996-12-12 Substrat enthaltend magnetische Partikeln, Sicherheitsdokument und Verfahren zu deren Detektion
US08/987,047 US5992741A (en) 1996-12-12 1997-12-10 Magnetic detection of security articles
ARP970105815A AR009662A1 (es) 1996-12-12 1997-12-11 Particulas magneticas, un sustrato que comprende tales particulas, un documento de seguridad, articulo de seguridad y un metodo para detectartales particulas
TR1998/01561T TR199801561T1 (xx) 1996-12-12 1997-12-12 Manyetik par�ac�klar, bu par�ac�klar� i�eren alt-tabaka, emniyetli belge ve bu gibi par�ac�klar�n bulgulanma y�ntemi.
ES97954829T ES2176817T3 (es) 1996-12-12 1997-12-12 Particulas magneticas, sustrato que comprende dichas particulas, documento de seguridad y procedimiento para detectar dichas particulas.
CNB971922276A CN100403342C (zh) 1996-12-12 1997-12-12 磁颗粒、基片、防伪物品、防伪文件以及检测这种颗粒的方法
SI9730364T SI0897569T1 (en) 1996-12-12 1997-12-12 Magnetic particles, substrate comprising such particles, security document and method for detecting such particles
HU9902281A HU225074B1 (en) 1996-12-12 1997-12-12 Magnetic particles, substrate comprising such particles, security document and method for detecting such particles
PT97954829T PT897569E (pt) 1996-12-12 1997-12-12 Particulas magneticas, substrato compreendendo as particulas em causa, documento de seguranca e processo de detectar as particulas mencionadas
PL328599A PL191795B1 (pl) 1996-12-12 1997-12-12 Cząsteczka magnetyczna, podłoże z cząsteczkami magnetycznymi i sposób wykrywania obecności cząsteczek magnetycznych w podłożu
RU98117129/12A RU2200977C2 (ru) 1996-12-12 1997-12-12 Магнитные частицы, основа, содержащая такие частицы, защищенный документ и способ обнаружения таких частиц
AU62063/98A AU732892B2 (en) 1996-12-12 1997-12-12 Magnetic particles, substrate comprising such particles, security document and method for detecting such particles
IDW980062A ID20296A (id) 1996-12-12 1997-12-12 Partikel-partikel magnet, subtrat yang terdiri dari partikel-partikel tersebut, dokumen pengaman dan metode untuk mendeteksi partikel-partikel tersebut
EP97954829A EP0897569B1 (de) 1996-12-12 1997-12-12 Magnetische partikel, substrat solche partikel enthaltend, sicherheitsdokument und methode zur erfassung solcher partikel
DE69712614T DE69712614T2 (de) 1996-12-12 1997-12-12 Magnetische partikel, substrat solche partikel enthaltend, sicherheitsdokument und methode zur erfassung solcher partikel
CA002246304A CA2246304C (en) 1996-12-12 1997-12-12 Magnetic particles, substrate comprising such particles, security document and method for detecting such particles
CZ982517A CZ251798A3 (cs) 1996-12-12 1997-12-12 Magnetické částice, substrát obsahující takové částice, cenný dokument a způsob detekce takovýchto částic
UA98094783A UA64709C2 (en) 1996-12-12 1997-12-12 Method and device for detecting test particles in a document substrate; test particles and a document test particle-containing substrate for determining the genuineness of the document
DK97954829T DK0897569T3 (da) 1996-12-12 1997-12-12 Magnetiske partikler, substrat med sådanne partikler, sikkerheds-dokument og fremgangsmåde ved detektering af sådanne partikler
JP52625698A JP4467646B2 (ja) 1996-12-12 1997-12-12 磁気粒子、そのような粒子を含むシート、保護文書およびそのような粒子を検出する方法
SK1061-98A SK285298B6 (sk) 1996-12-12 1997-12-12 Magnetické častice, substrát obsahujúci takéto častice, cenný dokument a spôsob detekcie takýchto častíc
BRPI9707632-5A BR9707632B1 (pt) 1996-12-12 1997-12-12 substrato, processo para detectar a presença de partìculas alongadas magnéticas em um substrato e partìcula alongada magnética.
AT97954829T ATE217721T1 (de) 1996-12-12 1997-12-12 Magnetische partikel, substrat solche partikel enthaltend, sicherheitsdokument und methode zur erfassung solcher partikel
PCT/EP1997/007340 WO1998026379A2 (en) 1996-12-12 1997-12-12 Magnetic particles, substrate comprising such particles, security document and method for detecting such particles
JP2009184152A JP2009277244A (ja) 1996-12-12 2009-08-07 磁気粒子、そのような粒子を含むシート、保護文書およびそのような粒子を検出する方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96402721A EP0848356A1 (de) 1996-12-12 1996-12-12 Substrat enthaltend magnetische Partikeln, Sicherheitsdokument und Verfahren zu deren Detektion

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EP0848356A1 true EP0848356A1 (de) 1998-06-17

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EP96402721A Withdrawn EP0848356A1 (de) 1996-12-12 1996-12-12 Substrat enthaltend magnetische Partikeln, Sicherheitsdokument und Verfahren zu deren Detektion

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AR (1) AR009662A1 (de)

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US3449585A (en) 1966-02-15 1969-06-10 Arnold Trehub Automatic recognition system using constant intensity image bearing light beam
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FR2425937A1 (fr) 1978-05-17 1979-12-14 Arjomari Prioux Structure fibreuse contenant des fibres metalliques, son procede de preparation, et son application notamment dans l'industrie du papier
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EP0153286A2 (de) 1984-02-15 1985-08-28 Esselte Meto Eas International Ab Verfahren und Anordnung zur Detektion eines Anzeigegeräts
EP0295028A1 (de) 1987-06-08 1988-12-14 Esselte Meto International GmbH Magnetische Vorrichtungen
US4820912A (en) 1985-09-19 1989-04-11 N. V. Bekaert S.A. Method and apparatus for checking the authenticity of documents
EP0625766A2 (de) 1993-05-19 1994-11-23 Nhk Spring Co., Ltd. Echtheitsüberprüfung von Gegenständen
EP0632398A2 (de) 1993-06-24 1995-01-04 Nhk Spring Co., Ltd. Verfahren und Gerät zur Echtheitskontrolle von Objekten
EP0656607A2 (de) 1993-12-02 1995-06-07 Nhk Spring Co., Ltd. Gegenstand, dessen Authentisität zu überprüfen ist und sein Herstellungsverfahren
WO1995024000A1 (en) 1994-03-04 1995-09-08 N.V. Bekaert S.A. Reproduction apparatus with microwave detection

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