EP2028017B1 - Sicherheitsvorrichtungen für Sicherheitssubstrate - Google Patents

Sicherheitsvorrichtungen für Sicherheitssubstrate Download PDF

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Publication number
EP2028017B1
EP2028017B1 EP08252744.1A EP08252744A EP2028017B1 EP 2028017 B1 EP2028017 B1 EP 2028017B1 EP 08252744 A EP08252744 A EP 08252744A EP 2028017 B1 EP2028017 B1 EP 2028017B1
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EP
European Patent Office
Prior art keywords
opaque
security device
security
layer
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.)
Not-in-force
Application number
EP08252744.1A
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English (en)
French (fr)
Other versions
EP2028017A3 (de
EP2028017A2 (de
Inventor
Marguerite Waters
Jim Snelling
Malcolm Baker
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De la Rue International Ltd
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De la Rue International Ltd
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Publication of EP2028017A2 publication Critical patent/EP2028017A2/de
Publication of EP2028017A3 publication Critical patent/EP2028017A3/de
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Publication of EP2028017B1 publication Critical patent/EP2028017B1/de
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    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • D21H21/42—Ribbons or strips
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • 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
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/369—Magnetised or magnetisable materials
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D2033/04—
    • B42D2033/08—
    • B42D2033/10—
    • B42D2033/16—
    • B42D2033/20—
    • B42D2033/26—
    • B42D2035/02—
    • B42D2035/08—
    • B42D2035/12—
    • B42D2035/20—
    • B42D2035/24—
    • B42D2035/34—
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light

Definitions

  • the invention relates to a security device for security substrates, such as paper, used for making security documents, such as bank notes, having anti-counterfeitable features.
  • elongate elements in paper or other substrates, usually as a security feature.
  • Such elements can be threads, strips or ribbons of, for example, plastic film, metal foil, metallised plastic, metal wire.
  • These elongate elements are included in the thickness of the substrate to render imitation of documents produced therefrom more difficult. These elements help in the verification of the documents as they render the view of the documents in reflected light different from that in transmitted light.
  • additional properties include magnetic properties, electrical conductivities, the ability to absorb x-rays, fluorescence, phosphorescence, optically variable effects and thermochromic behaviour.
  • windowed thread paper As a further security feature, it has been found to be particularly advantageous to provide windows in one side of the surface of the substrate, which expose such elongate elements at spaced locations. Examples of methods of manufacturing paper incorporating security elements with or without windows are described below. It should be noted that references to "windowed thread paper” include windowed paper incorporating any elongate security element.
  • EP-A-0059056 describes a method of manufacture of windowed thread paper on a cylinder mould paper-making machine.
  • the technique involves embossing the cylinder mould cover to form raised regions and bringing an impermeable elongate security element into contact with the raised regions of the mould cover, prior to the contact entry point into a vat of aqueous paper stock.
  • the impermeable security element makes intimate contact with the raised regions of the embossing, no fibre deposition can occur and windows are formed in the surface of the paper.
  • water is extracted from the wet fibre mat and the paper is passed through a drying process.
  • the regions of the security element which are exposed in the windows are visible in reflected light on one side of the paper. This feature is commonly used for banknotes.
  • a security document of this type provides this enhancement as, when viewed in transmitted light, the security element provides a different view from that which is seen under reflected light, where parts of the security element are readily visible in the windows.
  • EP-A-0319157 describes the incorporation in security paper of a security thread which has a recognisable pattern, design or indicia provided by partially demetallising a metallised carrier substrate.
  • the metal free portions are preferably letters which are clearly visible, when the security paper is viewed in transmitted light, as strong highlights against a much darker metal background.
  • the indicia can advantageously be legends or numerals relating to the security document itself, e.g. the denomination of a banknote.
  • a security element has a reflective metal layer in the form of a design which consists of at least one repeating geometric pattern of which the frequency, instantaneous amplitude or maximum amplitude of the pattern varies along the length of the element.
  • Such complex fine line patterns are extremely difficult for counterfeiters to generate by the commonly used technique of foil blocking. Additionally it has been found that such geometric designs are more easily recognised on a narrow thread than alphanumeric characters, which become less legible as they get smaller.
  • teller assist features are those commonly referred to as teller assist features. These are features that require a simple hand held device to view them.
  • a common teller assist security feature is one based on luminescent materials. Luminescent materials are known to those skilled in the art to include materials having fluorescent or phosphorescent properties. It is also well known to use other materials that respond visibly to invisible radiation, such as photochromic materials and thermochromic materials. The use of luminescent security features on threads has been described in EP-A-303725 , EP-A-319157 and WO-A-2006051231 , as well as in numerous other patent publications.
  • a dye or a fluorescent material there is present on either or both sides of the security thread a dye or a fluorescent material, which may be the same or different when the dye or fluorescent material is present on both sides of the strip or thread.
  • a demetallised security thread is uniformly coated on one side with a layer containing one fluorescent material and uniformly coated on the other side with another fluorescent material of a different colour.
  • UV ultra violet
  • each side When viewed under ultra violet (UV) reflected light, each side will exhibit its own particular colour more or less uniformly, although there may be some colour mix in the demetallised areas. In transmitted light, however, the demetallised areas will be perceived as a third colour which will be a mix of the other two and markedly distinguishable from them.
  • the strip or thread comprises a plastics substrate with demetallised indicia on one side thereof, and a dye or fluorescent material is present in the plastics substrate or on the surface of said substrate.
  • a dye or fluorescent material is present in the plastics substrate or on the surface of said substrate.
  • a security thread comprises an opaque layer with gaps to form indicia on a transparent polymeric carrier film.
  • Different fluorescent materials are applied to either side of the security thread such that in reflection the two surfaces emit a different colour when exposed to UV light.
  • a third and potentially fourth colour is observed in the gaps in the opaque layer resulting from the combination of the two surface colours.
  • the examples in the prior art describe a security element comprising an image created by gaps in an opaque layer that is visible in transmission or on exposure to UV light. Furthermore the security feature comprises zones fluorescing in two or more colours.
  • a problem with the structure of the security devices described in the prior art is that, in order to achieve multiple coloured fluorescent zones, the fluorescent material is applied to the opaque materials. In most cases the opaque material is metallic and has a characteristic sheen which, when exposed in a secure document, attracts the attention of the authenticator. If a fluorescent material is applied to the metallic layer there will be an undesirable reduction in the metallic sheen. This is of particular concern if the fluorescent material is a pigmented lacquer.
  • the superior lightfastness of pigmented fluorescent lacquers compared to organic dyes means that they are the preferred materials in security devices employed in documents, such as banknotes, where the feature must withstand a long lifetime in circulation.
  • the appropriate illumination source for example a UV light
  • the invention therefore provides a security device comprising a first opaque layer and a second opaque layer, said opaque layers each having a plurality of clear regions, a first fluorescent layer positioned between the first and second opaque layers, a second fluorescent layer, separated from the first fluorescent layer by one of the opaque layers, said first and second fluorescent layers exhibiting different visible colours under ultraviolet light wherein the clear regions in the first opaque layer form indicia and the clear regions in the second opaque layer overlap with only some of the clear regions in the first opaque layer.
  • a security device 10 has two opaque layers which are preferably supported by one or more substantially transparent carrier layers.
  • the opaque layers may be opaque to visible light and/or opaque to light (radiation) in the non-visible spectrum.
  • Each opaque layer is provided with gaps which partially overlap with the gaps in the other layer.
  • the gaps are transparent to, and therefore allows transmission of, the relevant form of light.
  • Two fluorescent layers are located so as to provide a range of different visual effects when the device 10 is viewed under different viewing conditions.
  • Figure 1 shows a security device 10 according to the present invention incorporated into a security substrate 11, used to make secure documents, as a "windowed thread" with windows 12 in which areas of the device 10 are exposed and bridges 13 under which areas of the device 10 are embedded.
  • the security device 10 can be incorporated into or arranged on the substrate 11 in any of the conventional formats known in the prior art, for example as patches, foils, stripes, strips or threads.
  • the security device 10 can be arranged either wholly on the surface of the substrate 11, as in the case of a stripe or patch, or can be visible only partly on one surface of the substrate 11 in the form of a windowed security thread as shown in Figure 1 .
  • EP-A-0860298 and WO-A-03095188 describe different approaches for the embedding of wider, partially exposed threads into a paper substrate.
  • Wide threads typically having a width of 2-6mm, are particularly useful as the additional exposed thread surface area allows for better use of optically variable devices, such as those used in the present invention.
  • the security device 10 of the present invention may be incorporated into a substrate 11 such that regions of the device 10 are visible on both sides of the substrate 11.
  • Methods of incorporating a security device such that it is viewable from both sides of the substrate 11 are described in EP-A-1141480 and WO-A-3054297 .
  • one side of the device is wholly exposed at one surface of the substrate 11 in which it is partially embedded, and partially exposed in windows at the other surface of the substrate.
  • the security device 10 can be incorporated into the substrate 11 using a registration system such that the designs formed by the indicia are coincident with the windows or apertures in the substrate.
  • a registration system such that the designs formed by the indicia are coincident with the windows or apertures in the substrate.
  • One possible thread registration system described in GB-A-2395959 , monitors the location of a control feature on a security element as it is being unwound and fed into the papermaking machine and a control feature on the substrate as it is formed. The system uses these position indicators to control the tension of the security element and rate of its embedment, so that the control features of the security element and substrate are in register.
  • the security device 10 is preferably prefabricated on a carrier strip and transferred to the substrate 11 in a subsequent working step.
  • the security device 10 can be applied to the substrate 11 using an adhesive layer, which is applied either to the security device 10 or the surface of the security substrate 11 to which the device 10 is to be applied. After transfer the carrier strip is removed leaving the security device 10 exposed. Alternatively the carrier strip can be left in place to provide an outer protective layer.
  • the security device 10 of the present invention can be used to authenticate documents made from a variety of substrates 11, but is particularly suitable for application to flexible substrates such as paper and polymer films.
  • substrates 11 are particularly useful for making documents of value such as banknotes, travellers cheques, certificates of authenticity, stamps, bonds, tax discs, fiscal stamps, secure labels, passports or vouchers.
  • the security substrate 11 generally undergoes further standard security printing processes to produce the secure document, including one or more of the following; wet or dry lithographic printing, intaglio printing, letterpress printing, flexographic printing, screen-printing, and/or gravure printing.
  • wet or dry lithographic printing intaglio printing
  • letterpress printing letterpress printing
  • flexographic printing screen-printing
  • gravure printing a printing technique that is used to produce the secure document.
  • the design of the security device 10 is linked to the document it is protecting by content and registration to the designs and identifying information provided on the document.
  • FIG. 2 shows a cross-sectional view of one embodiment of the security device 10 of the present invention suitable for application as a windowed security thread.
  • the security device 10 is created by laminating together two layers which are opaque to visible light with clear regions which allow the transmission of visible light. These are provided by two partially metallised polymeric substrates 14, 15, for example Polyethylene Terephthalate (PET) or Bi-axially Oriented Polypropylene (BOPP) which form transparent carrier layers for opaque metal layers.
  • PET Polyethylene Terephthalate
  • BOPP Bi-axially Oriented Polypropylene
  • the first partially metallised polymeric substrate 14 is produced such that no metal is present in controlled and clearly defined metal free (clear)regions 18.
  • Such partially metallised film can be made in a number of ways. One way is to selectively demetallise regions using a resist and etch technique such as is described in US4652015 . Other techniques are known for achieving similar effects; for example it is possible to vacuum deposit aluminium through a mask or aluminium can be selectively removed from a composite strip of a plastic support and aluminium using an excimer laser.
  • the metal free regions 18 take the form of indicia and are preferably in the form of images such as patterns, symbols and alphanumeric characters and combinations thereof.
  • the second partially metallised polymeric substrate 15 also comprises metal free regions 19 in the metallised film.
  • the two partially metallised polymeric substrates 14,15 are then laminated together with an adhesive layer 20 such that the red fluorescent layer 16 lies between the two substrates 14,15, as illustrated in Figure 2 .
  • the lamination process is registered such that metal regions 22 in the second metallised substrate 15 are positioned to block out part of the indicia provided by the metal free regions 18 in the first metallised substrate 14.
  • a masking coat may be applied to the surface of the security device 10 which is not exposed in the windows of the security document. In this case the masking coat would be applied to the fluorescent layer 17.
  • Adhesive layers 23 may be applied to the outer surfaces of the device 10 to improve adherence to the security substrate 11.
  • Figures 3a to f illustrate one example of a security feature that could be generated from a security device 10 with the structure shown in Figure 2 and incorporated in a secure substrate 11, for example as a windowed security thread.
  • Figure 3a is a plan view of the first partially metallised polymeric substrate 14 with the metal free regions 18 designed in the form of an image repeating along the length of the substrate 14, in this case a logo.
  • Figure 3b is a plan view of the second partially metallised polymeric substrate 15 comprising alternating blocks of metal free regions 19 and metal regions 21.
  • Both polymeric substrates 14, 15 are provided with a fluorescent layer 16,17 as indicated in Figure 2 .
  • the two partially metallised polymeric substrates 14,15 are laminated together such that the metal regions 22 on the second partially metallised polymeric substrate 15 coincide with every other metal free region 18 on the first partially metallised polymeric substrate 14.
  • the metal regions 22 in the second partially metallised polymeric substrate 15 block the light passing through every other image 18 such that only half of the indicia formed by the metal free regions 18 in the first partially metallised substrate 14 are visible in transmissive light, as illustrated in Figure 3c .
  • the exact colour observed in transmitted UV light will vary depending on which surface the security device 10 is viewed from due to the fact that the combined colour depends on the order in which the light passes through them. For example, when viewed from the surface closest to the red fluorescent layer 16 the magenta colour 24 will have a noticeable red tint, and when viewed from the surface closest to the blue fluorescent layer 17 the observed magenta colour 24 will have a noticeable blue tint.
  • the metal free regions 18 in the first partially metallised polymeric substrate 14 that are not coincident with the metal areas 22 in the second partially metallised polymeric substrate 15 will again appear in a magenta colour 24.
  • the metal free regions 18 in the first partially metallised polymeric substrate 14 that are coincident with the metal areas 22 in the second partially metallised polymeric substrate 15 will appear red 25 as the metal areas 22 on the second partially metallised polymeric substrate 15 prevent the UV light from exciting the blue fluorescent layer 17.
  • the authenticator observes a series of metal free regions 18 in alternate magenta 24 and red 25 colours ( Figure 3e ).
  • the metal free regions 19 in the second partially metallised polymeric substrate 15 will appear magenta 24 as a result of a combination of the red light emitted by the fluorescent layer 16 and the blue light emitted by the fluorescent layer 17.
  • the metal free regions 18 on the first partially metallised polymeric substrate 14 will appear in silhouette 29 within the magenta regions 24.
  • the metal areas 22 on the second partially metallised polymeric substrate 15 will appear blue 28 as only the light from the blue fluorescent layer 17 is observed in these regions 18 due to the opacity of the metal areas 22 blocking the red fluorescent layer 16.
  • the authenticator observes an alternating series of magenta and blue blocks 24,28 with a silhouette 29 of an image formed by the metal free regions 18 inside each magenta block 24 ( Figure 3f ).
  • the security device 10 is incorporated into a security substrate 11 such that in localised regions, known as apertures, it is viewable from both sides of the substrate 11.
  • a security substrate 11 such that in localised regions, known as apertures, it is viewable from both sides of the substrate 11.
  • FIG 4 illustrates an example of such a paper substrate 11 into which an elongate security device 10 is incorporated to create an aperture 30.
  • both surfaces of the security device 10 are visible.
  • the remainder of the device 10 is only visible from the front side of the substrate 11, as shown in Figure 4a , and not from the reverse side where the security device 10 is covered by paper fibres, as shown in Figure 4b .
  • Figures 5a to 5f illustrate another example of a security feature generated from a security device 10 with the structure shown in Figure 2 , incorporated into a paper substrate 11 according to the method described in WO-A-0039391 .
  • Figure 5a is a plan view of the first partially metallised polymeric substrate 14 with the metal free regions 18 forming the word "ONE" oriented horizontally and repeating along the length of the security device 10 separated by metal areas 21.
  • Figure 5b is a plan view of the second partially metallised polymeric substrate 15 comprising metal free regions 19 and metal areas 22. Both polymeric substrates 14,15 comprise a fluorescent layer 16,17 as indicated in Figure 2 .
  • the two partially metallised polymeric substrates 14,15 are laminated together in register with the metal regions 22 on the second partially metallised polymeric substrate 15 coinciding with a number of the letters formed by the metal free regions 18 on the first partially metallised polymeric substrate 14.
  • a series of words "ONE" are visible in a diagonal orientation.
  • the security device 10 with the demetallised designs illustrated in Figures 5a and 5b is preferably incorporated into a substrate, such as paper, such that the first partially metallised polymeric substrate 14 is wholly exposed on the front surface of the paper substrate ( Figures 5c-5e ) and the second partially metallised polymeric substrate 15 is partially exposed in an aperture 30 on the back surface of the paper substrate 11 ( Figure 5f ).
  • the diagonal repeating pattern "ONE" is observed in a combination of the visible colours emitted by the fluorescent layers 16,17( Figure 5d ).
  • the diagonal word "ONE” will appear in a magenta colour 24 as a result of a combination of the red light emitted by the fluorescent layer 16 on the first partially metallised polymeric substrate 14 and the blue light emitted by the fluorescent layer 17 on the second partially metallised polymeric substrate 15.
  • the diagonal word "ONE” will appear in a magenta colour 24.
  • the metal free regions 18 forming the letters in the first partially metallised polymeric substrate 14 that are coincident with the metal areas 22 in the second partially metallised polymeric substrate 15 will appear red 25 due to the metal areas 22 on the second polymeric substrate 15 preventing the UV light from exciting the blue fluorescent layer 17.
  • the authenticator observes the word "ONE” oriented horizontally and repeating along the length of the security device 10 with the colour of the letters arranged in magenta 24 and red 25 such that the diagonal word "ONE” is highlighted in magenta 24 ( Figure 5e ).
  • the security device 10 On viewing the back surface of the substrate 11 the security device 10 is only exposed in the aperture 30 and embedded in the substrate 11 outside the aperture 30. In reflected ambient light the portion of the security device 10 exposed in the aperture 30 appears uniformly metallic with a silhouette 29 of the diagonal word "ONE" ( Figure 5f ).
  • the device 10 In reflected UV light the device 10 will appear coloured in both the aperture 30 and embedded regions 31 although the colours will be significantly more intense on the part of the security device 10 exposed in the aperture 30.
  • the metal free regions 19 in the second partially metallised polymeric substrate 15 will appear magenta 24 as a result of a combination of the red light emitted by the fluorescent layer 16 on the first partially metallised polymeric substrate 14 and the blue light emitted by the fluorescent layer 17 on the second partially metallised polymeric substrate 15.
  • the diagonal word "ONE" will appear as a silhouette 29 within the blocks of magenta 24.
  • the metal regions 22 in the second partially metallised polymeric substrate 15 will appear blue 28 as only the light from the blue fluorescent layer 17 is observed in these regions due to the opacity of the metal regions 22 blocking the red fluorescent layer 16.
  • the authenticator observers an arrangement of magenta and blue blocks 24,28 with the magenta blocks 24 arranged in a diagonal pattern with the silhouette 29 of the word "ONE" running through the magenta blocks 27 ( Figure 5f ).
  • Figures 6a to 6f illustrate a further example of a design for a security feature generated from a security device 10 of the present invention with the structure shown in Figure 2 .
  • the security device 10 is in the form of a security thread.
  • Figure 6a is a plan view of the first partially metallised polymeric substrate 14 with metal free regions 18 in the form of characters forming the word "FACET" repeating along the length of the security device 10 separated by metal areas 21.
  • Figure 6b is a plan view of the second partially metallised polymeric substrate 15 comprising metal free regions 19 and metal areas 22.
  • Each polymeric substrate 14,15 comprises a fluorescent layer 16,17 as indicated in Figure 2 .
  • the two polymeric substrates 14,15 are laminated together in register, with the metal areas 22 on the second partially metallised polymeric substrate 15 coinciding with the demetallised "F” and the "T” characters on the first partially metallised polymeric substrate 14 such that when the security device 10 is viewed in transmission ( Figure 6c ) in ambient lighting the word "ACE" is observed repeating along the device 10.
  • the word "ACE” On viewing the security device 10 under transmitted UV illumination the word "ACE” is observed in a combination of the visible colours emitted by the fluorescent layers.
  • the word “ACE” will appear in a magenta colour 24 ( Figure 6d ) as a result of a combination of the red light emitted by the fluorescent layer 16 on the first partially metallised polymeric substrate 14 and the blue light emitted by the fluorescent layer 17 on the second partially metallised polymeric substrate 15.
  • the word "ACE” will again appear in a magenta colour 24.
  • the letters formed by the metal free regions 18 in the first partially metallised polymeric substrate 14 that are coincident with the metal areas 22 on the second partially metallised polymeric substrate 15 will appear red 25 due to the areas 22 on the second partially metallised polymeric substrate 15 preventing the UV light from exciting the blue fluorescent layer 17.
  • the authenticator observes the word “FACET” repeating along the length of the security device 10 with the letters “ACE” being in magenta 24 and the letters "F” and "T” being in red 25( Figure 6e ).
  • the metal free regions 19 in the second partially metallised polymeric substrate 15 will appear magenta 24.
  • the word "ACE” will appear as a silhouette 29 within the magenta regions 24.
  • the metal areas 22 in the second partially metallised polymeric substrate 15 will appear blue 28 as only the light from the blue fluorescent layer 17 is observed in these areas 22 due to the opacity of the metal areas 21 blocking out the red fluorescent layer 16.
  • the authenticator observes a series of magenta blocks 24, inside which is a silhouette of the word "ACE", separated by blue blocks 28( Figure 6f )
  • the first or the second partially metallised polymeric substrate 14,15 is a sacrificial carrier film and is discarded after the lamination process.
  • the use of a sacrificial carrier film is illustrated in Figures 7a to 7d .
  • Figure 7a illustrates the first metallised polymeric film 14, which is as described in relation to Figure 2 except in that it now comprises a release layer 32 between the first polymeric substrate 14 and the metal areas 21.
  • Figure 7b illustrates the second metallised polymeric substrate 15 which comprises the layers described in relation to Figure 2 .
  • the two partially metallised polymeric substrates 14,15 are laminated together with an adhesive layer 20 using a registered process such that the metal areas 22 on the second partially metallised substrate 15 are positioned to block out some of the indicia formed by the metal free regions 21 on the first partially metallised substrate 14, see figure 7c
  • the first polymeric substrate 14 is then stripped away at the release layer 32 to leave the final structure of the security device 10 as shown in Figure 7d .
  • the advantage of using a sacrificial carrier layer for either the first or second polymeric substrates 14,15 is that it significantly reduces the thickness of the final security device 10. This is particularly important for security devices 10 used in security documents which have to be sorted and distributed using automated cash handling equipment where any localised increase in thickness can result in handling problems.
  • the second partially metallised substrate 15 in Figure 2 is replaced with a coloured opaque layer which has gaps or clear regions.
  • This embodiment will have the same appearance as the structure of Figure 2 when viewed in transmitted ambient light and reflected and transmitted UV light.
  • an additional visual effect is observed in that the metal free regions 18 in the first partially metallised polymeric substrate 14 not coincident with the clear regions (which correspond to the metal free regions 19) in the coloured opaque layer will be readily apparent due to the contrast between the coloured opaque layer and the metallic background.
  • This provides the additional benefit in ambient light of revealing one image in reflected light, when viewed from the surface of the first partially metallised polymeric substrate 14, and a different image in transmitted light.
  • the security device 10 When the security device 10 is incorporated into a document such that its bottom surface 26 is exposed either wholly or in localised regions/windows 12 on the front or back surface of the document then the second partially metallised polymeric substrate 15 or the replacement coloured opaque layer will be visible.
  • a coloured opaque layer such as a black pigmented ink
  • the additional security benefit it provides in ambient reflected light is compromised by the poor aesthetic appearance of the exposed coloured opaque layer on the front or back surface of the document.
  • Figure 8 illustrates an alternative structure of the security device 10 of the present invention which provides the additional benefit, in ambient light, of revealing one image in reflected light and a different image in transmitted light whilst still providing an aesthetically pleasing metallic appearance when viewed from both sides of the security device 10.
  • the device 10 has a similar structure to that shown in Figure 2 with an additional opaque coloured material 34 applied between the red fluorescent layer 16 and the second metal areas 22.
  • the opaque coloured material 34 is applied in register with the first metal areas 21 such that it is visible through the metal free regions 18 in the first partially metallised polymeric substrate 14 that are coincident with the metal areas 22 in the second partially metallised polymeric substrate 15.
  • the laminated structure of the security device 10 of Figure 8 will show the same behaviour as the laminated structure of the security device 10 of Figure 2 when viewed in ambient transmitted light and transmitted and reflected UV light.
  • the security device 10 of Figure 8 will show an additional effect when viewed from its top surface 27 in ambient reflected light in which the metal free regions 18 coincident with the opaque coloured material 34 will be readily apparent due to the contrast between the opaque coloured material 34 and the metallic background.
  • FIGs 9a to 9e illustrate yet another example of a security feature, generated from security device 10 of the present invention with the structure shown in Figure 8 .
  • the two partially metallised polymeric substrates 14,15 have the same demetallised designs as shown in Figures 3a and 3b and the security device 10 is preferably incorporated into a paper substrate 11 as a windowed security device 10 such that the second partially metallised polymeric substrate 15 ( Figure 3b ) is exposed in the windows 12.
  • the metal regions 22 on the second polymeric substrate 15 block the light passing through every other image formed by the metal free regions 18.
  • the metal free regions 19 in the second partially metallised polymeric substrate 15 will appear magenta 24.
  • the image formed by the metal free regions 18 on the first partially metallised polymeric substrate 14 will appear as a silhouette 29 within the magenta regions 24.
  • the metal areas 22 in the second partially metallised polymeric substrate 15 will appear blue 28 as only the light from the blue fluorescent layer 17 is observed in these areas 22 due to the opacity of the metal areas 22 blocking out the red fluorescent layer 16.
  • the authenticator observers an alternating series of magenta and blue blocks 24,28 with a silhouette of an image inside each magenta block 24. In reflected UV light the images will be visible in both the windows 12 and embedded regions 13 although the colours will be significantly more intense in the windows 12.
  • the coloured opaque layer 34 may be applied onto localised regions of the second partially metallised substrate 15, as shown in Figure 8 , using any common printing technique.
  • the localised printed regions are preferably the same width or wider than the corresponding indicia formed by the metal free regions 18 in the first partially metallised polymeric substrate 14 .
  • the resist forms the opaque coloured layer 34.
  • the second metallised polymeric film 15 is printed with a resist containing a coloured dye or pigment.
  • Suitable resists include the dye BASF Neozapon X51 or the pigment (well dispersed) "Carbon Black 7" mixed into a material with both good adhesion to metal and caustic resistance.
  • the dye loading can be up to 50% (by weight) of the final coat of resist depending on coat thickness and desired blackness.
  • An example of a class of suitable resist materials is vinyl chlorides/vinyl acetate copolymers such as Union Carbide Ucar resins, Sun VHL 31534, or Wacker Vinnol E 15/45m.
  • the printed second metallised film 15 is then partially demetallised, according to a known demetallisation process using a caustic wash which removes the metal in the regions not printed with the resist.
  • the remaining metal areas 22 are still coated with resist, which provides a dark opaque layer 34 which is visible when the security device 10 of Figure 10 is viewed from its top surface 27 in reflection.
  • the dye or pigment in the coloured opaque layer 34 may be a conducting material, such as carbon black, to produce a machine-readable or conducting layer.
  • a conducting material such as carbon black
  • it may be a magnetic material, such as magnetite, to produce a machine readable magnetic layer.
  • the inventive structure of the security device 10 of the present invention enables designs to be created that are striking and memorable to the general public, but are very complex which makes is very difficult for a potential counterfeiter to try to reproduce.
  • the highly contrasting appearances when viewed in different light sources and from different sides enables the security device to be readily recognisable to the user.
  • the additional requirement to accurately register the metal free regions 18, 19 on the front and back of the device 10 is very hard to counterfeit effectively.
  • the laminated structure of the security device 10 illustrated in Figure 2 has an additional advantage in that the two sets of metal areas 21,22 are in the middle of the laminated structure and are not exposed. This overcomes a known disadvantage of demetallised security threads which is their susceptibility to corrosive or abrasive effects during paper manufacturing and in circulating banknotes. In the structure illustrated in Figure 2 the two sets of metal areas 21,22 are protected from any corrosion or abrasion by the polymeric substrates 14,15.
  • the metal areas 21,22 could be on the opposite sides of their respective polymeric substrates 14,15.
  • the only requirement is that there is a fluorescent layer 16 in between the two sets of metal areas 21,22 and a fluorescent layer 17 of a different colour external to the two sets of metal areas 21,22.
  • FIG 11 shows a further alternative structure for a security device 10 of the present invention suitable for incorporation into a security document.
  • the security device 10 comprises a single layer 35 of a polymeric substrate, for example Polyethylene Terephthalate (PET) or Bi-axially Oriented Polypropylene (BOPP)which is metallised on both surfaces.
  • a fluorescent material 16 is present in the polymeric substrate 35 or on the top surface of the substrate 35.
  • the fluorescent material 16 is colourless in normal daylight but emits a specific visible colour when excited by UV radiation.
  • the metallised polymeric substrate 35 is partially demetallised such that the top surface comprises first metal free regions 18 and first metal areas 21 which are used to create indicia in the form of identifying images and the bottom surface comprises second metal free regions 19 and second metal areas 22.
  • the first metal free regions 18, 19 are arranged such that the second metal areas 22 layer are positioned to block out part of the information provided by the first metal free regions 18.
  • Adhesive layers 20 can be applied to the outer surfaces of the device 10 to improve adherence to the secure document.
  • the invention is not limited to any particular colour combination of the fluorescent layers 16,17, and example colour combinations of the two fluorescent layers 16,17 are given in the table below.
  • Fluorescent layer 16 Fluorescent layer 17 Combined colour when viewed in transmitted light. Red Yellow Orange Yellow Blue Green Red Blue Purple Green Blue Cyan Red Blue Magenta
  • the present invention is also not limited to UV activated fluorescent materials. Any fluorescent materials can be used that respond visibly to invisible radiation such as phosphorescent materials, IR activated materials, photochromic materials and thermochromic materials.
  • inks in particular metallic or metal effect inks and more preferably high reflectivity metallic or metal effect inks, may be deposited on the polymeric substrates 14,15 by a printing technique to form opaque layers with negative indicia.
  • metallic or metal effect inks in particular metallic or metal effect inks and more preferably high reflectivity metallic or metal effect inks
  • other optical effect inks can be used e.g. OVI® optically variable inks.
  • opaque-coloured printing inks can be used.
  • liquid crystal polymeric films or inks can be used.
  • Figure 12 illustrates an example where the second opaque layer is obtained by combining a layer 36 of a liquid crystal material with a darkly coloured background absorbing layer 37 to enhance the colourshifting effect of the liquid crystal material.
  • the liquid crystal layer 36 exhibits a red to green colourshift when viewed in reflection over the dark absorbing layer 37.
  • the absorbing layer 36 comprises an opaque design printed on the second polymeric substrate 15 using a dark ink or dye.
  • a liquid crystal film is then applied over the design using a coating or laminating process.
  • the opaque designs can be overprinted using a liquid crystal ink e.g. Oasis® ink from SICPA.
  • the security device 10 of Figure 12 will show the same behaviour as the security device 10 of Figure 2 when viewing in ambient transmitted light and transmitted and reflected UV light. Furthermore the security device 10 of Figure 12 will show an additional effect when viewed from its top surface 27 in ambient reflected light in which the first metal free regions 18 coincident with the liquid crystal layer 36 superimposed on the dark absorbing layer 37 will be readily apparent due to the contrast between the optically variable liquid crystal material, exhibiting a red to green colourshift, and the metallic background.
  • the security device 10 of Figure 12 is incorporated into a substrate 11 such that the bottom surface 26 of the security device 10 is exposed either wholly or in localised regions/windows 12 on the front or back surface of the substrate 11, then the dark absorbing layer 37 may be visible. If this is not desirable then a masking coat may be used to obscure the dark absorbing layer 37 and a suitable material for such a masking coat would be Coates 3188XSN or Coates Heliovyl White S90 353. A typical coat weight is suggested to be in the region of 2GSM. Alternatively the dark absorbing layer 37 may be masked by a second metallised layer using similar structures to those described in Figures 8 and 10 .
  • Figure 13a shows an embodiment of the security device 10 of the present invention having a similar structure to that shown in Figure 10 , but in which the second metallised polymeric layer 15 is selectively demetallised using a resist and etch technique and in which the resist contains a black coloured dye or pigment.
  • a layer 36 of a liquid crystal film is applied over the dark absorbing layer 37 provided by the black resist, such that when the security device 10 is viewed from its top surface 27 in ambient reflected light the first metal free regions 18 coincident with the liquid crystal layer 36 superimposed on the layer 37 of black resist will exhibit a colourshift.
  • Figure 13b shows a further embodiment of the security device 10 of the present invention comprising a liquid crystal layer 36.
  • the structure is similar to that shown in Figure 2 , but in which the first metallised polymeric layer 14 is selectively demetallised using a resist and etch technique and in which the resist contains a black coloured dye or pigment.
  • a layer 36 of a liquid crystal film is applied over the dark absorbing layer 37 provided by the black resist, such that when the security device 10 is viewed from its top surface 27 in ambient reflected light an angular dependent colourshift will be observed where the liquid crystal layer 36 is superimposed on the layer 37 of black resist.
  • the security device 10 may also be used to provide machine-readable information.
  • the opaque layers formed by the first and second metals areas 21,22 may be applied using a magnetic or conductive ink.
  • the opaque layers could be applied using a vapour deposited magnetic material for example Fe, Ni or Co.
  • Figure 14 illustrates an approach to forming a machine-readable construction of a security device 10 of the present invention for application as a windowed security device 10.
  • the device 10 has a similar structure to that shown in Figure 2 with a magnetic material applied in localised regions between the two partially metallised polymeric layers 14,15.
  • the magnetic material can be applied in any design but common examples include the use of magnetic tramlines or the use of magnetic blocks 39 to form a coded structure.
  • Suitable magnetic materials include iron oxide pigments (Fe 2 O 3 or Fe 3 O 4 ), barium or strontium ferrites, iron, nickel, cobalt and alloys of these.
  • alloys includes materials such as Nickel:Cobalt, Iron:Aluminium:Nickel:Cobalt and the like.
  • Flake Nickel materials can be used; in addition Iron flake materials are suitable. Typical nickel flakes have lateral dimensions in the range 5-50 microns and a thickness less than 2 microns. Typical iron flakes have lateral dimensions in the range 10-30 microns and a thickness less than 2 microns.
  • a transparent magnetic composite material can be incorporated at any position within the structure of the security device 10.
  • Suitable transparent magnetic composite materials containing a distribution of particles of a magnetic material of a size and distributed in a concentration at which the magnetic composite material remains transparent are described in WO-A-03091953 and WO-A-03091952 .
  • the security device 10 of the present invention may also include other anti-counterfeiting materials, such as thermochromic materials, liquid crystal coatings or films, colourshifting inks, colourshifting interference films and holographic generating structures.
  • other anti-counterfeiting materials such as thermochromic materials, liquid crystal coatings or films, colourshifting inks, colourshifting interference films and holographic generating structures.
  • Figure 15 shows an embodiment of the current invention comprising a holographic generating structure.
  • the structure is similar to that shown in Figure 2 but with an additional layer 40 of lacquer applied to the first polymeric substrate 14 before it is metallised.
  • the security device 10 of Figure 15 will show the same behaviour as the security device 10 of Figure 2 when viewing in ambient transmitted light and transmitted and reflected UV light. Furthermore the security device 10 of Figure 15 will display a holographic image when viewed from its top surface 27 in ambient reflected light. On viewing the security device 10 of Figure 15 from its bottom surface in ambient reflected light the holographic image is visible in the metal free regions 18 in the first partially metallised polymeric substrate 14 that are not coincident with the metal areas 22 in the second partially metallised polymeric substrate.
  • At least one of the opaque layers is provided by a layer which is transparent to visible light but opaque to light in the non-visible ultra-violet wavelength range of the electromagnetic spectrum.
  • the security device will have the structure shown in Figure 2 except that the metal regions 22 are now replaced with a UV absorbing coating which is substantially transparent to visible light but opaque to non-visible UV radiation.
  • Suitable UV absorbing coatings include a UV barrier coating supplied by Sun Chemical with the product code NMHR-70-20669.
  • a suitable UV absorbing compound which could be applied to conventional coatings is a hydroxyphenyl triazine class of UV absorber sold under the name Tinuvin® 400 by Cuba®.
  • Figures 16a to 16f illustrate one example of a security feature that could be generated from a security device with this construction.
  • Figure 16a is a plan view of a polymeric substrate 14 which has been metallised to provide opaque metal regions 21 and comprises metal free regions 18 designed in the form of an image repeating along the length of the substrate 14, in this case a logo.
  • Figure 16b is a plan view of a second polymeric substrate 15 comprising blocks 41 of a UV absorbing coating which is substantially transparent to visible light but is opaque to UV light. Gaps 19 are provided between the blocks 41 which allow the transmission of UV and visible light.
  • Both of the polymeric substrates 14, 15 are provided with a fluorescent layer 16, 17 as indicated in Figure 2 .
  • the two polymeric substrates 14, 15 are laminated together such that the UV opaque blocks 41 on the second polymeric substrate 15 coincide with every other metal free region 18 on the first partially metallised polymeric substrate 14.
  • a combination of the visible colours emitted by the fluorescent layers 16, 17 are observed in the metal free regions 18 in the first metallised polymeric substrate 14 that are not coincident with the UV absorbing blocks 41 on the second polymeric substrate 15( Figure 3d ).
  • the images will appear in a magenta colour 24 as a result of a combination of the red light emitted by the fluorescent layer 16 on the first partially metallised polymeric substrate 14 and the blue light emitted by the fluorescent layer 17 on the second polymeric substrate 15.
  • the exact colour observed in transmitted UV light will vary depending on which surface 26,27 the security device 10 is viewed from due to the fact that the combined colour depends on the order in which the light passes through them. For example, when viewed from the surface closest to the red fluorescent layer 16 the magenta colour 24 will have a noticeable red tint.When viewed from the surface closest to the blue fluorescent layer 17 the observed magenta colour 24 will have a noticeable blue tint.
  • the metal free regions 18 in the first partially metallised polymeric substrate 14 that are not coincident with the UV absorbing blocks 41 on the second polymeric substrate 15 will again appear in a magenta colour 24.
  • the metal free regions 18 in the first partially metallised polymeric substrate 14 that are coincident with the UV absorbing blocks 41 in the second polymeric substrate 15 will appear red as the UV absorbing blocks 41 on the second polymeric substrate 15 prevent the UV light from exciting the blue fluorescent layer 17. In this manner the authenticator observes a series of metal free regions in alternate magenta and red colours 24,25( Figure 16e ).
  • the gaps 19 between the UV absorbing blocks 41 on the second polymeric substrate 15 will appear magenta 24 as a result of a combination of the red light emitted by the fluorescent layer 16 and the blue light emitted by the fluorescent layer 17.
  • the metal free regions 18 on the first partially metallised polymeric substrate 14 will appear in silhouette 29 within the magenta regions 24.
  • the UV absorbing blocks 41 on the second polymeric substrate 15 will appear blue as only the light from the blue fluorescent layer 17 is observed in these regions due to the UV absorbing blocks 41 preventing UV light from exciting the red fluorescent layer 16.
  • UV opaque layers are applicable to any of the previously described embodiments of the present invention.
  • Figure 11 which comprises a single layer of PET with a patterned opaque metallised layer on either side
  • one of the metallised layers could be replaced with a UV absorbing layer which is substantially transparent to visible light.

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Claims (29)

  1. Sicherheitseinrichtung, welche eine erste opake oder undurchsichtige Schicht sowie eine zweite opake oder undurchsichtige Schicht aufweist, wobei jede der opaken oder undurchsichtigen Schichten eine Vielzahl von durchsichtigen Bereichen, eine zwischen der ersten und zweiten opaken oder undurchsichtigen Schicht angeordnete erste fluoreszierende Schicht und eine von der ersten fluoreszierenden Schicht durch eine der opaken oder undurchsichtigen Schichten getrennte zweite fluoreszierende Schicht aufweist, wobei die erste und die zweite fluoreszierende Schicht unterschiedliche sichtbare Farben unter UV-Licht zeigen, wobei die durchsichtigen Bereiche in der ersten opaken oder undurchsichtigen Schicht Markierungen bilden und die durchsichtigen Bereiche in der zweiten opaken oder undurchsichtigen Schicht sich mit nur einigen Bereichen der durchsichtigen Bereiche in der ersten opaken oder undurchsichtigen Schicht überlappen.
  2. Sicherheitseinrichtung nach Anspruch 1, welche eine im Wesentlichen transparente Trägerschicht aufweist, wobei die erste und die zweite opake oder undurchsichtige Schicht an gegenüberliegenden Seiten der Trägerschicht aufgebracht werden.
  3. Sicherheitseinrichtung nach Anspruch 1, welche zwei transparente Trägerschichten aufweist, wobei die erste opake oder undurchsichtige Schicht auf einer Seite einer ersten der Trägerschichten aufgebracht wird und die zweite opake oder undurchsichtige Schicht auf eine Oberfläche einer zweiten der Trägerschichten aufgebracht wird, wobei die zwei Trägerschichten durch Lamination mit der ersten fluoreszierenden Schicht verbunden werden, welche zwischen der ersten und zweiten opaken oder undurchsichtigen Schicht angeordnet ist.
  4. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, in welcher die opaken oder undurchsichtigen Schichten für sichtbares Licht undurchlässig sind.
  5. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, in welcher die opaken oder undurchsichtigen Schichten Metallschichten umfassen.
  6. Sicherheitseinrichtung nach Anspruch 5, in welcher die Metallschichten teilweise entmetallisiert sind, um die durchsichtigen Bereiche bereitzustellen.
  7. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, in welcher die opaken oder undurchsichtigen Schichten leitende und/oder magnetische Eigenschaften aufweisen.
  8. Sicherheitseinrichtung nach einem der Ansprüche 1 bis 4, in welcher eine oder beide der opaken oder undurchsichtigen Schichten Schichten aus Druckfarbe aufweisen.
  9. Sicherheitseinrichtung nach Anspruch 8, in welcher die Druckfarbe Metallictinte oder Metalldruckfarbe ist.
  10. Sicherheitseinrichtung nach Anspruch 7 oder Anspruch 8, in welcher die Druckfarbe leitende und/oder magnetische Eigenschaften aufweist.
  11. Sicherheitseinrichtung nach einem der Ansprüche 1 bis 3, in welcher eine oder beide der opaken oder undurchsichtigen Schichten nur für Licht im nicht-sichtbaren Spektrum undurchlässig sind.
  12. Sicherheitseinrichtung nach Anspruch 11, in welcher eine oder beide der opaken oder undurchsichtigen Schichten für UV-Licht undurchlässig sind.
  13. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, in welcher die fluoreszierenden Schichten in normalem Tageslicht farblos sind und bei Anregung durch UV-Licht farbig sind.
  14. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, in welcher die zweite opake oder undurchsichtige Schicht opake oder undurchsichtige Blöcke aufweist, die sich mit durchsichtigen Blöcken abwechseln.
  15. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, welche des Weiteren ein opakes oder undurchsichtiges farbiges Material aufweist, das zwischen der ersten fluoreszierenden Schicht und der zweiten opaken oder undurchsichtigen Schicht angeordnet ist, so dass es in den durchsichtigen Bereichen in der ersten opaken oder undurchsichtigen Schicht sichtbar ist.
  16. Sicherheitseinrichtung nach Anspruch 15, in welcher das opake farbige Material schwarze Tinte oder Druckfarbe ist.
  17. Sicherheitseinrichtung nach Anspruch 15, in welcher das opake farbige Material ein absorbierender Farbstoff ist.
  18. Sicherheitseinrichtung nach Anspruch 15, in welcher das opake farbige Material ein Abdecklack ist.
  19. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, welche des Weiteren eine Schicht aus Flüssigkristallmaterial sowie eine dunkel gefärbte Absorptionsschicht mit durchsichtigen Bereichen umfasst.
  20. Sicherheitseinrichtung nach Anspruch 19, in welcher die zweite opake oder undurchsichtige Schicht die dunkel gefärbte Absorptionsschicht umfasst.
  21. Sicherheitseinrichtung nach Anspruch 20, in welcher die dunkle Absorptionsschicht und die zweite opake oder undurchsichtige Schicht nebeneinander liegen und die durchsichtigen Schichten in jeder dieser Schichten mit den durchsichtigen Bereichen in der anderen Schicht übereinstimmen.
  22. Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche, welche des Weiteren ein magnetisches Material umfasst, welches zwischen den beiden opaken oder undurchsichtigen Schichten angeordnet ist.
  23. Sicherheitssubstrat, welches die Sicherheitseinrichtung nach einem der vorhergehenden Ansprüche umfasst, welche auf ein Basissubstrat aufgebracht wird oder in dieses eingebaut wird.
  24. Sicherheitssubstrat nach Anspruch 23, in welchem die Sicherheitseinrichtung als Patch, Folie oder Streifen auf die Oberfläche des Basissubstrats aufgebracht wird.
  25. Sicherheitssubstrat nach Anspruch 23, in welchem die Sicherheitseinrichtung in das Basissubstrat als längliches Sicherheitselement eingebaut ist.
  26. Sicherheitssubstrat nach Anspruch 25, in welchem das längliche Sicherheitselement zumindest teilweise in Fenstern in zumindest einer Oberfläche des Substrats sichtbar ist.
  27. Sicherheitssubstrat nach Anspruch 25, in welchem zumindest ein Teil des länglichen Sicherheitselements in zumindest einer Öffnung durch das Substrat sichtbar ist.
  28. Sicherheitsdokument, welches aus dem Sicherheitssubstrat nach einem der Ansprüche 23 bis 27 gebildet wird.
  29. Sicherheitsdokument nach Anspruch 28, in welchem dass Sicherheitsdokument eine Banknote, ein Traveller- oder Reisescheck, eine Urkunde oder Echtheitszeugnis, ein Reisepass, ein Gutschein, ein Stempel, ein Sicherheitsetikett oder ein anderes Wertdokument ist.
EP08252744.1A 2007-08-23 2008-08-19 Sicherheitsvorrichtungen für Sicherheitssubstrate Not-in-force EP2028017B1 (de)

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GB2452078B (en) 2009-12-23
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EP2028017A2 (de) 2009-02-25
GB2452078A (en) 2009-02-25

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