DE4212290C2 - Value document - Google Patents

Value document

Info

Publication number
DE4212290C2
DE4212290C2 DE4212290A DE4212290A DE4212290C2 DE 4212290 C2 DE4212290 C2 DE 4212290C2 DE 4212290 A DE4212290 A DE 4212290A DE 4212290 A DE4212290 A DE 4212290A DE 4212290 C2 DE4212290 C2 DE 4212290C2
Authority
DE
Germany
Prior art keywords
layer
magnetic
metal layer
security
document
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 - Fee Related
Application number
DE4212290A
Other languages
German (de)
Other versions
DE4212290C1 (en
Inventor
Joachim Dipl Chem Dr Sues
Hubert Dipl Ing Suesner
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.)
Kurz Leonhard Stiftung and Co KG
Original Assignee
Kurz Leonhard Stiftung and Co KG
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
Priority to DE4206441 priority Critical
Application filed by Kurz Leonhard Stiftung and Co KG filed Critical Kurz Leonhard Stiftung and Co KG
Priority claimed from DE4242407A external-priority patent/DE4242407C2/en
Priority to DE4242407A priority patent/DE4242407C2/en
Priority to DE4212290A priority patent/DE4212290C2/en
Priority claimed from TW081103460A external-priority patent/TW236016B/zh
Publication of DE4212290C1 publication Critical patent/DE4212290C1/en
Publication of DE4212290C2 publication Critical patent/DE4212290C2/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/328Diffraction gratings; Holograms
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/083Constructional details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D2033/00Structure or construction of identity, credit, cheque or like information-bearing cards
    • B42D2033/16Magnetic or magnetisable material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D2035/00Nature or shape of the markings provided on identity, credit, cheque or like information-bearing cards
    • B42D2035/12Shape of the markings
    • B42D2035/20Optical effects

Description

The invention relates to value documents, in particular banknotes, Credit cards, ID cards or tickets, which at least at one their surfaces carry a security feature, on the one hand a magnetic layer of a dispersion magnetisable Particles in a binder and on the other hand a diffractive optical effective security layer, in particular a Hologram or a computer-generated diffraction structure, an interference layer or a diffraction grating, wherein the security layer at least the magnetic layer partially superimposed and facing the magnetic layer Surface of the security layer a diffractive optical effective spatial structure and with a reflective, non-magnetizable metal layer provided is, and between the magnetic layer and metal layer, a resist layer is provided.

Value documents of the type described above are for example, known from US-PS 46 84 795. There is also already basically the production of such value documents described by stamping foils. A detailed explanation suitable stamping foils with a magnetic layer and a diffractive optical safety layer are the DE 34 22 910 C1.

From DE 34 22 911 C1 an embossing film is known in the between the magnetic layer and a marking layer one Solving the Signierschicht by in the magnetic layer contained solvent-preventing barrier provided is. In addition, in this document is a stamping foil explained, in which a reflective, with a diffractive optically effective structure provided metal layer connects directly to the magnetic layer. It is thus in This document the problem of a disturbing influence of Magnetic layer, in particular the magnetic particles, on a Metal layer nowhere treated.

Similarly, DE 31 38 559 C2 describes Barrier layers, the penetration of plasticizing and other chemical, the stability and lifespan degrading substances in the interior of a multi-layered Identity card to prevent. Any indication of that Possibility to use such barrier layers to the Influence of the magnetic particles of a magnetic layer on one Turn off reflective metal layer is not here seen

In US 4,376,006 A1 is a magnetic Recording material described in which a magnetic layer covered by a layer of non-magnetic metal to be invisible to the magnetic layer in this way or the appearance of the recording material improve. Also in this document is nowhere on the Possibility noted that the magnetic layer to a Corrosion of the reflective metal layer could result. That this problem was not recognized in the prior art, It is clear from this that all possible reflective metal layers referred to as equivalent in particular aluminum simultaneously with tin, gold and silver as a possible material for the reflective Metal layer is called. At a certain Embodiment of the magnetic recording material even between the magnetic layer and the reflective one Metal layer, a bonding agent layer of a synthetic resin in a thickness of about 0.5 microns provided. This layer has However, only the task of the liability of the reflective Metal layer on the Magnetschichht to improve. It would be but neither because of their composition nor in particular considering the very small thickness suitable, as Barrier layer to serve and damage the reflective metal layer through the metal particles of the Magnetic layer to prevent.

Finally, in "Römpp, Chemielexikon 1990" under the Keyword "anticorrosive" protective coatings on Acrylic resin or chlorine-based rubber described. These However, known protective layers are of a kind that, to to achieve a sufficient corrosion protection, layer thicknesses required, which are not used for value documents can be. Only through the special composition of Barrier layer according to the invention, it is possible with to get along with correspondingly small layer thicknesses, so that in particular, the required magnetic properties be achieved.

So far, in the production of such value documents or Hot stamping foils generally proceeded so that the Clarification of the diffraction optical effective structure serving, on the correspondingly patterned surface of the Security layer applied, reflective metal layer of vacuum evaporated aluminum or aluminum alloys is formed. The use of aluminum for the however, reflective metal layer may result significant problems, especially if that appropriate value document used in a humid atmosphere shall be. In this case, it has been shown in part that the aluminum layer is destroyed at least point by point or at least changes in appearance, discolored, for example. This allows the function of the Security feature. This is going on all noticeable when it is at the diffractive optical effective structure of the security layer around one machine-readable structure, such as a hologram or a computer generated diffraction structure.

Investigations have shown that the destruction or Damage to the aluminum layer probably on it attributed to the fact that the magnetizable particles of the Magnetic layer, which is usually iron oxides different oxidation states, with the aluminum the reflective metal layer causing corrosion of aluminum react. The exact mechanism for this Reaction is unknown. Presumably, the damage is on it attributed to the fact that the iron oxide pigments used as magnetizable particles are used as Proton donors act, with the circumstance also a role plays that the used iron oxide pigments in pH values range between 3.0 and 5.5. Here you can then, under certain circumstances, between the magnetizable particles on the one hand and serving as a reflective metal layer Aluminum on the other hand local elements with corresponding Destruction of the aluminum layer form.

In the stamping film according to DE 34 22 910 C1 is between the reflective metal layer and the magnetic layer one Adhesive layer of a thickness of about 0.3 to 0.7 microns provided, consisting of a high molecular weight PMMA resin and of Consists of pigments formed matting agent. These However, primer layer may have an effect of Magnetic particles on the reflective metal layer not with prevent the necessary safety, especially because of the layer thickness usually at the lower limit the aforementioned adhesion promoter layer.

The invention is therefore based on the object value documents of the type mentioned above in such a way that the previously observed problems of destruction or change of reflective metal layer as a result of appropriate action the magnetizable particles on the reflective Metal layer reliably switched off, d. H. the Worth document regarding its original features the reflective metal layer as unchanged as possible maintains.

To solve this problem is according to the invention in a Value document of the type mentioned above, such to proceed, that between the metal layer and the Magnetic layer an action of the magnetizable Preventing particles on the metal layer, having a pH of 7 barrier layer arranged by a layer of organic polymers which inorganic, Proton adsorbing Pigments are mixed in, where the barrier layer is a Thickness of 0.5 to 5 microns, preferably from 2 to 3 microns, having.

According to the invention thus the influence of magnetizable particles of the magnetic layer on the Reflective metal layer prevents that between the metal layer and the magnetic layer the additional, specially designed barrier layer is provided by organic polymers is formed, as well as one in the alkaline Range lying pH, and the inorganic Pigments are mixed, which adsorb protons.

As additional security, it is possible according to the invention in addition to the barrier layer, the metal layer of chromium, Copper or gold or alloys of at least two of these Metals to form, thereby increasing the resistance even further is improved.

As polymers for the barrier layer z. B. high molecular weight Acrylic resins, polyvinylidene chloride copolymers, PVC, PVC copolymers, Chlorinated rubber, polyester and silicone-modified Binders are used. Come as inorganic pigments For example, silicates and / or titanium dioxide into consideration. A such compound barrier layer of sufficient thickness forms a reliable buffer or a reliable one Adsorber medium in any case to protons, so that their Walk through the barrier layer and a corresponding Damage to the metal layer can be safely prevented. The provided according to the invention  Thickness of the barrier layer is sufficient on the one hand for a reliable backup of the reflective Metal layer opposite to the magnetizable particles of Magnetic layer. On the other hand, with such a small thickness the barrier layer is not expected to be legible the data stored in the magnetic layer somehow is impaired.

Further features, details and advantages of the invention will be apparent from the following description of Embodiments one with a security feature after The invention provided credit card and one for Production of such a card or such Wertdocuments suitable stamping foil.

In the drawing shows

Fig. 1 is a plan view of a credit card with a security feature according to the invention;

Fig. 2 shows a section along line II-II through the card of Fig. 1 and

Fig. 3 is a sectional, schematic section through a hot stamping foil.

The credit card shown in Fig. 1 is a conventional plastic card 1 , which carries on its front side, for example in embossed letters the name 2 of the cardholder and a code number 3 . The plastic card 1 is also provided on its front side with a security feature which on the one hand comprises a running over the entire width of the card magnetic stripe 4 and on the other hand, an optical security feature 5 , which, as shown in FIGS. 1 and 2 can clearly recognize, partially overlaps the magnetic strip 4 , but partially (in Fig. 1, top, in Fig. 2, left) projects beyond the magnetic strip.

The optical security feature 5 is designed, for example, according to the security feature described in US-PS 46 84 795. It consists of a transparent optically effective security layer 6 , which is provided at least in regions (in the inner region of FIG. 1) on its underside with a structurally effective structure 7 . At least in the area of the structure 7 which is effective in terms of diffraction optics, the diffraction-optically effective security layer 6 is provided with a metal layer 8 , which is applied, for example, to the diffraction-optically active structure 7 of the security layer 6 by vapor deposition in a vacuum. In that regard, the document of value of Figs. 1 and 2 is substantially identical to that described in US-PS 46 84 795.

In contrast to the known value document, however, a barrier layer 9 is now provided in the document according to FIGS. 1 and 2 between the magnetic layer 4 and the metal layer 8 , for example having a thickness of between 0.5 and 5 μm, preferably between 2 and 3 μm can. The barrier layer 9 has the purpose of preventing the action of the magnetic pigments present in the magnetic layer 4 , which are usually iron oxides, on the metal layer 8 . With regard to the possible composition of this barrier layer and the other layers of the value document according to FIGS. 1 and 2, reference is made to the following, more detailed explanation of the stamping foil according to FIG. 3.

In addition to the attachment of a barrier layer 9 , it is also possible to make the metal layer 8 of a metal which does not react with the magnetizable particles of the magnetic layer 4 , for example of chromium, copper, silver or gold or an alloy of at least two of these metals.

The attachment of the various layers of the value document or the credit card of FIGS. 1 and 2 can be done in different ways. For example, it is readily possible first to apply the magnetic layer 4 to the plastic card 1 , then, for example, in a printing operation, to apply the barrier layer 9 . This barrier layer 9 , if it consists of a suitable material, can be vapor-deposited with a metal layer 8 , if appropriate only partially, by methods known per se. Following this, the spatial structure in the region of the metal layer 8 must then be generated, it being of course also possible to form this spatial structure even before the vapor deposition of the metal layer. Finally, then the security layer 6 , z. B. also applied in a printing process.

However, a value document according to FIGS. 1 and 2 can be manufactured considerably more simply if all the layers, namely the magnetic layer 4 , the barrier layer 9 , the metal layer 8 and the security layer 6 are applied in one operation with the aid of a stamping foil according to FIG . Theoretically, however, it is also possible to use two separate embossing foils, one of which essentially comprises only the magnetic layer, while the other comprises the barrier layer, the metal layer and the protective layer. So you would have z. B. proceed when producing the credit card of FIG. 1 by means of stamping foils.

In Fig. 3, a stamping foil is shown in a schematic section, which is suitable for mounting the entire security feature, ie both for applying the magnetic layer 4 and the security layer 6 with the reflective metal layer 8 in one step.

The magnetic film of FIG. 3 comprises a carrier film 10 in a manner known per se. At this is, for example, via a not shown in the drawing, preferably consisting of wax release layer, arranged a total of 11 transfer layer. The transfer layer 11 comprises, starting from the carrier film 10 , on the one hand a transparent topcoat layer, which serves as a diffractive optical security layer 6 . This topcoat layer or security layer 6 is at least partially spatially structured on its surface facing away from the carrier film 10 in such a way that it can develop diffraction-optical effects. For example, the security layer 6 is provided with a structure 7 in the form of a hologram or a computer-generated diffraction structure, an interference layer or a diffraction grating. The structure 7 is generally embossed into the security lacquer layer 6 applied to the carrier film 10 , the lacquer forming the layer 6 here being either a thermoplastic lacquer or a crosslinking lacquer which, at the time of embossing of the structure 7, has not yet completely hardened can.

On the structure 7 carrying surface of the security layer 6 , a metal layer 8 is then applied in a vacuum, for. B. vapor-deposited. To ensure that the further layers reliably adhere to this metal layer 8 , which reflects, an adhesion promoter layer 12 is applied before the further layer is applied. Adjacent to this adhesion promoter layer 12 are then the barrier layer 9 , the magnetic layer 4 and an adhesive layer 13 serving for fixing the transfer layer 11 on a substrate, although this adhesive layer 13 may also be omitted if the magnetic layer 4 has corresponding properties.

For the rest, it should be noted that the respective layer thicknesses are not shown to scale in FIG . The security layer 6 normally has a thickness of about 0.3 to 1.2 μm. The metal layer 8 of chromium, copper, silver or gold or corresponding alloys is vapor-deposited in a conventional manner in a vacuum and has a thickness of 0.01 to 0.04 microns. The primer layer 12 is usually applied in a thickness of 0.2 to 0.7 microns. The barrier layer 9 has, as already mentioned, a thickness of 0.5 to 5 microns. The magnetic layer 4 usually has a thickness of 4 to 12 μm, preferably about 9 μm. The adhesive layer corresponds in thickness approximately to the thickness of the security layer 6 .

The application of the various layers takes place with the methods known from the stamping foil production, as described, for example, in DE 34 22 910 C1. It is used as a carrier film z. B. a polyester film of a thickness of 19 to 23 microns used, then the various layers are applied by gravure rollers. Each time after application of the individual layers, the possibly required drying takes place. The spatial structure 7 of the security layer 6 is produced either by means of a rotating embossing cylinder or by stroke embossing.

The various layers of the stamping foil of FIG. 3 may be composed as follows:

Protective lacquer or security layer 6 component Parts by weight high molecular weight PMMA resin 2,000 Silicon alkyd oil-free 300 nonionic wetting agent 50 methyl ethyl ketone 750 low viscosity nitrocellulose 12,000 toluene 2,000 diacetone 2 500

Metal layer 8

Vacuum deposited layer of chromium, copper, silver or Gold or alloys thereof.

Adhesive layer 12 component Parts by weight high molecular weight PMMA resin 1200 methyl ethyl ketone 3400 toluene 1000 matting agent 100

Barrier layer 9 component Parts by weight methyl ethyl ketone 30 toluene 35 ethyl alcohol 15 Vinyl chloride-vinyl acetate copolymer (mp: <65 ° C) 11 Unsaturated polyester resin (mp: 100 ° C, d = 1.24 g / cm³) 3 Silicone polyester resin (D = 1.18 g / cm³) 2 Hydrophobic silica (pH 7 of a 5% slurry in H₂O) 4

Magnetic layer 4

This consists of a dispersion acicular γ-Fe₂O₃ magnetic pigments in a polyurethane binder, various paint assistants and a solvent mixture from methyl ethyl ketone and tetrahydrofuran.

However, the magnetic layer does not necessarily have this Have composition. Instead of Fe₂O₃ pigments z. B. Other magnetic pigments, such as Co-doped magnetic iron oxides or other finely dispersed magnetic materials (Sr, Ba-ferrites) can be used.  

Adhesive layer 13

In the adhesive layer 13 may be z. B. act a known hot melt adhesive layer. The attachment of this layer is not always necessary. This depends on the composition of the substrate on which the embossing film is to be embossed. For example, if the substrate is made of PVC, as is usually the case with credit cards, a special hot-melt adhesive layer can usually be dispensed with.

For applying the embossing foil according to FIG. 3, this is placed with the transfer layer 11 first on the plastic card 1 or another, according to document to be backed up, and then pressed under the action of heat against this document. In this case, on the one hand via the adhesive layer 13 and the corresponding tacky magnetic layer 4, the transfer layer 11 connects to the corresponding surface of the document to be secured. On the other hand, as a result of the action of heat, the transfer layer 11 is detached from the carrier film 10 . This release is particularly facilitated if an additional waxy release layer is present between the transfer layer 11 and the carrier film 10 .

Claims (3)

1. document of value, in particular banknote, credit card, identity card or ticket, which carries a security element on at least one of its surfaces, comprising on the one hand a magnetic layer of a dispersion of magnetisable particles in a binder and on the other hand a diffractive optical safety layer, in particular a hologram or a computer-generated diffraction structure, an interference layer or a diffraction grating, the security layer at least partially superimposed on the magnetic layer, the magnetic layer facing surface of the security layer having a diffractive optical effective spatial structure and is provided with a reflective, non-magnetizable metal layer, and between the magnetic layer and metal layer, a resist layer is provided , characterized in that between the metal layer ( 8 ) and the magnetic layer ( 4 ) prevents an action of the magnetizable particles on the metal layer 7, a barrier layer ( 9 ) having a pH of 7 is formed, which is formed by a layer of organic polymers admixed with inorganic, proton-adsorbing pigments, wherein the barrier layer ( 9 ) has a thickness of 0.5 to 5 μm having.
2. Document of value according to claim 1, characterized in that the barrier layer ( 9 ) has a thickness of 2 to 3 microns.
3. document of value according to claim 1 or 2, characterized in that the metal layer ( 8 ) of chromium, copper, silver or gold or alloys of at least two of these metals is formed.
DE4212290A 1992-02-29 1992-04-11 Value document Expired - Fee Related DE4212290C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4206441 1992-02-29
DE4242407A DE4242407C2 (en) 1992-02-29 1992-04-11 Embossing foil, esp. Hot stamping foil, preferably for the production of value documents
DE4212290A DE4212290C2 (en) 1992-02-29 1992-04-11 Value document

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4242407A DE4242407C2 (en) 1992-02-29 1992-04-11 Embossing foil, esp. Hot stamping foil, preferably for the production of value documents
DE4212290A DE4212290C2 (en) 1992-02-29 1992-04-11 Value document
TW081103460A TW236016B (en) 1992-02-29 1992-05-04

Publications (2)

Publication Number Publication Date
DE4212290C1 DE4212290C1 (en) 1993-05-27
DE4212290C2 true DE4212290C2 (en) 1996-08-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE4212290A Expired - Fee Related DE4212290C2 (en) 1992-02-29 1992-04-11 Value document

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Cited By (12)

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DE19729918A1 (en) * 1997-07-04 1999-01-07 Bundesdruckerei Gmbh Security and / or valuable document
US7667895B2 (en) 1999-07-08 2010-02-23 Jds Uniphase Corporation Patterned structures with optically variable effects
US7674501B2 (en) 2002-09-13 2010-03-09 Jds Uniphase Corporation Two-step method of coating an article for security printing by application of electric or magnetic field
EP2189286A3 (en) * 2003-06-30 2010-08-04 Kba-Giori S.A. Printing machine and method
US7876481B2 (en) 1999-07-08 2011-01-25 Jds Uniphase Corporation Patterned optical structures with enhanced security feature
US8025952B2 (en) 2002-09-13 2011-09-27 Jds Uniphase Corporation Printed magnetic ink overt security image
US8118963B2 (en) 2002-09-13 2012-02-21 Alberto Argoitia Stamping a coating of cured field aligned special effect flakes and image formed thereby
US8726806B2 (en) 2002-07-15 2014-05-20 Jds Uniphase Corporation Apparatus for orienting magnetic flakes
US8999616B2 (en) 2002-09-13 2015-04-07 Jds Uniphase Corporation Taggent flakes for covert security applications having a selected shape
US9102195B2 (en) 2012-01-12 2015-08-11 Jds Uniphase Corporation Article with curved patterns formed of aligned pigment flakes
US9458324B2 (en) 2002-09-13 2016-10-04 Viava Solutions Inc. Flakes with undulate borders and method of forming thereof
US9522402B2 (en) 2002-07-15 2016-12-20 Viavi Solutions Inc. Method and apparatus for orienting magnetic flakes

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DE19729918B4 (en) * 1997-07-04 2010-07-01 Securency International Pty Ltd., Craigieburn Security and / or valuable document
DE19729918A1 (en) * 1997-07-04 1999-01-07 Bundesdruckerei Gmbh Security and / or valuable document
US7880943B2 (en) 1999-07-08 2011-02-01 Jds Uniphase Corporation Patterned optical structures with enhanced security feature
US7667895B2 (en) 1999-07-08 2010-02-23 Jds Uniphase Corporation Patterned structures with optically variable effects
US7876481B2 (en) 1999-07-08 2011-01-25 Jds Uniphase Corporation Patterned optical structures with enhanced security feature
US8726806B2 (en) 2002-07-15 2014-05-20 Jds Uniphase Corporation Apparatus for orienting magnetic flakes
US9522402B2 (en) 2002-07-15 2016-12-20 Viavi Solutions Inc. Method and apparatus for orienting magnetic flakes
US8025952B2 (en) 2002-09-13 2011-09-27 Jds Uniphase Corporation Printed magnetic ink overt security image
US8118963B2 (en) 2002-09-13 2012-02-21 Alberto Argoitia Stamping a coating of cured field aligned special effect flakes and image formed thereby
US7674501B2 (en) 2002-09-13 2010-03-09 Jds Uniphase Corporation Two-step method of coating an article for security printing by application of electric or magnetic field
US8999616B2 (en) 2002-09-13 2015-04-07 Jds Uniphase Corporation Taggent flakes for covert security applications having a selected shape
US9458324B2 (en) 2002-09-13 2016-10-04 Viava Solutions Inc. Flakes with undulate borders and method of forming thereof
EP2189286A3 (en) * 2003-06-30 2010-08-04 Kba-Giori S.A. Printing machine and method
US9102195B2 (en) 2012-01-12 2015-08-11 Jds Uniphase Corporation Article with curved patterns formed of aligned pigment flakes

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