EP3007903B1 - Structure de securite a element optique diffractif - Google Patents

Structure de securite a element optique diffractif Download PDF

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Publication number
EP3007903B1
EP3007903B1 EP14733373.6A EP14733373A EP3007903B1 EP 3007903 B1 EP3007903 B1 EP 3007903B1 EP 14733373 A EP14733373 A EP 14733373A EP 3007903 B1 EP3007903 B1 EP 3007903B1
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EP
European Patent Office
Prior art keywords
diffractive optical
opaque
optical element
region
security
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EP14733373.6A
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German (de)
English (en)
French (fr)
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EP3007903A1 (fr
Inventor
Pierre Sarrazin
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Oberthur Fiduciaire SAS
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Oberthur Fiduciaire SAS
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/346—Perforations
    • 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
    • B42D25/355—Security threads
    • B42D2033/22—
    • B42D2035/36—
    • B42D2035/50—

Definitions

  • the present invention relates to security structures and secure articles, in particular documents, comprising such structures.
  • DOEs diffractive optical elements
  • These elements can be produced with a view to being illuminated by monochromatic or polychromatic light, in order to generate the interference pattern by diffraction and transmission through the element to a viewing plane.
  • this display plane can be virtual and located between the element and the light source or be materialized by an actual surface located behind the element with respect to the source.
  • Australian patent application AT 2013 100 172 describes a security document comprising a multitude of openings produced by laser ablation generating a diffractive optical element and a reflective layer having on its surface series of grooves and a layer of liquid crystal.
  • Australian patent application AU 2011101567 describes the use and visualization of diffractive optical elements sensitive to at least three different wavelengths on security documents.
  • the diffractive optical elements are recorded with three different lengths and the interference pattern is reproduced by lighting at the appropriate wavelengths.
  • the invention aims to meet all or part of these needs.
  • non-opaque microzone designates an area which is sufficiently permeable to light to allow the visualization of the interference pattern by virtue of the light passing through this area, having a cross section of surface less than or equal to 1,000,000 ⁇ m 2 , better less or equal to 200,000 ⁇ m 2 , even better between 10 ⁇ m 2 and 200,000 ⁇ m 2 , even better between 5,000 ⁇ m 2 and 200,000 ⁇ m 2 .
  • the non-opaque microzone has a cross section sufficient to observe the DOE in transmitted light and sufficiently reduced so as not to be substantially visible in reflection.
  • a non-opaque microzone is thus of limited extent, being delimited by an opaque periphery.
  • the non-opaque microzone can be translucent, in particular diffusing part of the light passing through it or transparent, not diffusing the light passing through it.
  • the non-opaque microzone is transparent.
  • a non-opaque microzone has the advantage of being easily detectable only under certain observation conditions, and is therefore not easily visible to the naked eye if these observation conditions are not observed.
  • the use of a non-opaque microzone makes it easier to conceal the diffractive optical element and makes counterfeiting more difficult to carry out.
  • the non-opaque microzone can be of circular or non-circular cross-section, in particular polygonal, in particular regular or non-regular polygonal, or oblong, in particular elliptical.
  • the non-opaque microzone can be produced in a layer of fibrous or non-fibrous material which extends all around the non-opaque microzone.
  • the non-opaque microzone can be a microperforation of a layer of a substantially opaque material filled at least partially, preferably entirely, with a transparent material comprising in particular a protective adhesive material.
  • the transparent material by penetrating into the microperforation, makes it possible to join the layer of substantially opaque material and the layer carrying the diffractive optical element.
  • the fact that the microperforation is at least partially filled makes it possible to protect it from the external environment, in particular from dirt.
  • the or each non-opaque microzone can be defined by an absence of material within a layer of a substantially opaque material, in particular be defined by a microperforation through this opaque material when the latter is, for example, a fibrous substrate, or be defined by demetallization when the opaque material is metallic.
  • microperforations these are preferably carried out using a laser.
  • the microperforations are carried out using micro-needles or by water jet.
  • the axis of this microperforation is preferably oriented substantially normally on the surface of the layer through which the microperforation is carried out.
  • the axis can, as a variant, form an angle with the normal to the surface of the layer which is crossed by the microperforation.
  • the non-opaque microzone can be, when defined by a microperforation, of constant cross section or not over the thickness of the layer crossed by the microperforation.
  • the non-opaque microzone can also be delimited by an impression of an opaque ink, in particular an impression of a transparent plastic film, for example the same film as that on which the diffractive optical element is produced.
  • the same layer of the structure according to the invention may have a plurality of non-opaque microzones, each overlapping at least partially on the same diffractive optical element.
  • the non-opaque microzone (s) can each form a pattern which is found in at least part of the interference pattern generated by the diffractive optical element.
  • the non-opaque microzone has a contour which is found in the interference pattern, for example the same geometric shape.
  • non-opaque microzones can together define a pattern which is found in at least part of the interference pattern, for example the image of the same character, place, monument or object, or the same text, for example the value d '' a banknote or the name of a bank.
  • the pattern facilitates authentication by the observer by comparing said pattern to the interference pattern. This arrangement increases the security of the document because the counterfeiting requires the reproduction of the pattern both in the microzones and in the interference pattern of the security structure.
  • the thickness of the layer through which the microperforation passes can be between 10 and 1,000,000 ⁇ m.
  • the number of non-opaque microzones is preferably between 1 and 1500 non-opaque microzones per cm 2 , preferably between 10 and 500 per cm 2 , more preferably between 10 and 300 per cm 2 .
  • the diffractive optical element which generates the interference pattern in a viewing plane distant from the diffractive optical element is preferably of digital type. Its manufacture is then based, as described in WO 2008/031170 , on a matrixing carried out according to complex data which are reconstructed in the display plane to form a two-dimensional interference pattern.
  • the diffractive optical element when illuminated by a collimated light source, it generates an interference pattern producing an image in this viewing plane, which is visible on a surface positioned in this plane, or visible in transmission from this plan.
  • the mathematical transformation between the element and the visualization plane can be compared to a fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • complex data comprising phase and amplitude information, must be physically encoded in the microstructure of the element.
  • the relief to be given to the microstructure can be calculated by carrying out the inverse FFT transform of the desired pattern in the display plane.
  • Diffractive optical elements are sometimes referred to as computer generated holograms, and differ from other types of holograms such as rainbow, Fresnel or volume reflection holograms.
  • the diffractive optical element is an embossed structure.
  • the interference pattern generated by the diffractive optical element is found at least in part, better in total, on the security structure, or on the article, in particular the document incorporating it, in particular in the form of a print and / or a security element, in particular a watermark, and / or a pattern generated by microperforations or a metallization or demetallization.
  • microperforations one of these can define the non-opaque microzone.
  • the diffractive optical element generates the image of a character and a watermark reproducing the same character is present on a fibrous substrate on which a microperforation is carried out defining the non-opaque microzone.
  • the non-opaque microzone can also belong to a security element which reproduces all or part of the interference pattern.
  • the non-opaque microzone is formed by demetallization of a metallic security thread and the image of a character produced by the interference pattern is found on the wire, being formed by demetallization thereon, with or without superposition with the diffractive optical element.
  • the diffractive optical element is smaller, in particular in all directions of its plane, than the non-opaque microzone.
  • the diffractive optical element may be larger in at least one direction of its plane than the non-opaque microzone.
  • the diffractive optical element is preferably formed on a thermoplastic film, preferably transparent, having a thickness less than or equal to 50 ⁇ m, in particular by embossing the latter.
  • This thermoplastic film can be laminated at least partially with the layer carrying the non-opaque microzone or through which the non-opaque microzone is produced.
  • the thermoplastic film comprising the diffractive optical element is fixed to the layer carrying the non-opaque microzone by an adhesive structure, preferably also protective, comprising an adhesive material.
  • the adhesive structure can be introduced in the liquid state between the thermoplastic film and the layer carrying the non-opaque microzone by means of at least one microperforation, in particular forming at least one non-opaque microzone.
  • thermoplastic film makes it possible to form the diffractive optical element independently of the rest of the secure article, and therefore to facilitate its manufacture.
  • thermoplastic film can be laminated or glued with a security element, in particular a security wire or foil, having at least one transparent zone, in particular the non-opaque microzone, overlapping at least partially with the diffractive optical element.
  • This security element may have a security pattern, in particular in the form of printing, microperforations or metallization or demetallization. As indicated above, this pattern can correspond at least partially to the interference pattern produced by the diffractive optical element.
  • the diffractive optical element can be recorded on the thermoplastic film by a process known as “roll to roll”.
  • the diffractive optical element can be viewed under polychromatic or monochromatic light.
  • the diffractive optical element can be associated with an optical, interference, iridescent or absorbent filter, placed on the path of the light reaching or leaving the optical element. diffractive.
  • This filter can belong to the security structure or to the article and thus constitute an additional security element as such.
  • the security structure may be in the form of an element which is integrated into a fibrous substrate during the manufacture thereof or which is attached to its surface.
  • the security structure can be in the form of a patch, security wire, foil or film.
  • the security structure may be exposed to the external environment on its two opposite faces or be exposed on only one of them or be covered on its two faces by one or more layers which are not completely opaque, for example a film protective or varnish.
  • the security structure can be in one piece at the time of its integration into or on the rest of the article, in particular of the document, or be composed of several sub-elements which are assembled via the rest of the article, in particular of the document, for example being reported on different faces of a substrate of the document. These sub-elements may or may not come into contact with each other.
  • a first sub-element can carry the diffractive optical element and second sub-element can carry the associated non-opaque microzone, and the two can be separated by at least one layer of substrate from the document or be assembled directly one with the other.
  • the security structure comprises a protective adhesive structure or an adhesive structure associated with a protective structure disposed between the first sub-element carrying the diffractive optical element, in particular the diffractive optical element and the second sub-element carrying the microzone not opaque.
  • protective adhesive structure or protective structure means a layer or a plurality of layers intended to protect mechanically and / or optically, the diffractive optical element in particular when the diffractive optical element is an embossed structure.
  • the protective adhesive structure preferably comprises a layer of a mixture of an HRI (high refractive index) material and an adhesive material which is placed on the diffractive optical element.
  • HRI high refractive index
  • the first sub-element comprises a layer of an HRI material, preferably deposited by vacuum spraying on the diffractive optical element, on which is preferably arranged a layer of an adhesive material, the layer of adhesive material being preferably disposed between the layer of HRI material and the second sub-element carrying the non-opaque microzone.
  • the superimposition of the layer of HRI material and the layer of adhesive material forms the protective adhesive structure.
  • the adhesive layer makes it possible to mechanically protect the diffractive optical element
  • the HRI material protects the diffractive optical element from attenuation or cancellation of its optical effect which could result from the presence of the adhesive material.
  • the protective structure associated with the adhesive structure comprises a mixture of a HRI (high refractive index) material and a binder, which is disposed on the diffractive optical element, the adhesive structure preferably being disposed on the protective structure, in particular between the second sub-element carrying the non-opaque microzone and the protective structure.
  • HRI high refractive index
  • the first sub-element comprises a layer of HRI material arranged, in particular deposited by vacuum spraying, on the diffractive optical structure, on which is arranged a layer comprising a binder, the superposition of the layer of HRI material and the layer comprising a binder forming the protective structure associated with the adhesive structure.
  • the adhesive structure is preferably arranged on the protective structure, in particular between the protective structure and the second sub-element carrying the non-opaque microzone.
  • the binder is secured for example by the presence of a specific marker or of a luminescent compound.
  • the layer of HRI material makes it possible to optically protect the diffractive optical element and the binder layer makes it possible to mechanically protect the diffractive optical element.
  • the HRI material makes it possible to protect the diffractive optical element from attenuation or cancellation of its optical effect which could result from the presence of the adhesive material and / or the layer comprising a binder.
  • an HRI material is meant a material having a high refractive index, preferably greater than or equal to 1.7.
  • the HRI material is chosen from zinc sulfide (ZnS), zinc oxide (ZnO), zirconium oxide (ZrO 2 ), titanium dioxide (TiO 2 ), carbon (C), indium oxide (In 2 O 3 ), indium tin oxide (ITO), tantalum pentoxide (Ta 2 O 5 ), cerium oxide (CeO 2 ), itrium oxide (Y 2 O 3 ), europium oxide (Eu 2 O 3 ), ferrous oxides, hafnium nitride (HfN), hafnium carbon (HfC), hafnium oxide (HfO 2 ), l lanthanum oxide (La 2 O 3 ), magnesium oxide (MgO), neodymium oxide (Nd 2 O3), praseodymium oxide (Pr 6 O 11 ), samarium oxide (Sm 2 O 3
  • the protective adhesive structure or the adhesive structure associated with a protective structure can be introduced via one or more microperforations of the second sub-element, in particular at least one microperforation defining a non-opaque microzone.
  • the protective adhesive structure or the adhesive structure associated with a protective structure may partially, preferably completely, fill the microperforation (s).
  • the diffractive optical element is arranged on a first side of the first sub-element, the second side of the sub-element having no diffractive optical element and the adhesive structure being disposed between the second sub-element and the second side of the first sub-element.
  • the adhesive structure is therefore not in contact with the diffractive optical element.
  • the security structure may include a plurality of said diffractive optical elements, each generating an interference pattern in a viewing plane distant from the diffractive optical element.
  • These diffractive optical elements can generate different or identical interference patterns, complementing each other or not.
  • the protective adhesive structure or the protective structure is applied to all the diffractive optical elements.
  • the security structure may include a plurality of non-opaque microzones, each at least partially superimposed on at least one respective diffractive optical element.
  • a plurality of non-opaque microzones is superimposed on the same diffractive optical element.
  • the non-opaque microzone (s) can visually define a pattern which is found at least partially in the interference pattern generated by at least one diffractive optical element.
  • several non-opaque microzones are arranged in an arrangement which reproduces one or more alphanumeric characters, and the interference pattern produces an image of these same alphanumeric characters in the display plane.
  • the pattern facilitates authentication by comparing the pattern to the interference pattern. This arrangement further increases the difficulty for the potential counterfeiter who should reproduce the pattern both in the microzones and in the interference pattern of the security structure.
  • the security structure may comprise at least one absorbent or interference filter, in particular a colored filter, at least partially superimposed on the non-opaque microzone.
  • the security structure may comprise at least two non-opaque microzones each formed by an axis microperforation forming an angle with the normal with the surface of the security structure, the angles being different. At least two diffractive optical elements may each overlap at least partially to a respective non-opaque microzone. This arrangement makes it possible, by orienting the light beam differently, to be able to visualize one or the other of the interference patterns produced and to be able to create, for example, an animation by alternately observing the two interference patterns.
  • the subject of the invention is also an article, according to claim 13, in particular a secure document comprising a security structure according to the invention.
  • the secure document may comprise a substrate, in particular a fibrous substrate, having at least one window, the window being at least partially superimposed both on the diffractive optical element and on the non-opaque microzone.
  • the security structure can be attached to or integrated into this substrate.
  • the secure article may have at least a second non-opaque microzone, at least partially superimposed both on the diffractive optical element and on the first non-opaque microzone.
  • the or each non-opaque microzone can be defined by absence of material, in particular by microperforation.
  • the microperforations can each be carried out in a fibrous jet. The observation is made through the two non-opaque microzones.
  • the secure article may include a substrate, in particular a fibrous substrate, comprising a microperforation defining the non-opaque microzone, and the diffractive optical element may be present on a security element attached to or integrated into said substrate.
  • the security structure consists of the security element and the substrate.
  • the secure article may include a security element having at least one non-opaque microzone superimposed on the diffractive optical element.
  • the latter can be formed on a thermoplastic film, which is assembled, for example by lamination, with the security element, when the latter is already in place or not on the document.
  • the secure item can be a passport, an identity card, an access card, a driver's license, an interactive playing or collecting card, a means of payment, in particular a payment card, a bank note. , a tax stamp, a sticker, a voucher or a coupon, a transport, loyalty, service or subscription card, a token or a casino plate.
  • the secure article preferably has at least one security element or pattern which is identical or at least partially similar to the interference pattern.
  • the two patterns can be identical except for a transformation, in particular to a homothety, have the same form, present the same information in particular in alphanumeric characters, the typography being able to be different.
  • the two reasons include, for example, the same written information, in particular on civil status, the currency of a denomination, the name of a place, a date, or the same visual information, in particular a photograph or a drawing.
  • the light is preferably collimated.
  • the diffractive optical element when the diffractive optical element is lit, the light passes through the non-opaque microzone before meeting the diffractive optical element and generating an interference pattern.
  • the light source can be polychromatic, the display plane being virtual and positioned between the light source and the security structure.
  • the polychromatic light can be white light.
  • the interference pattern is observed through the non-opaque microzone which serves as a viewfinder.
  • the method may include the step of disposing at least one filter, for example a colored or interference filter, between the light beam and the security structure, or between the viewing plane and the observer.
  • at least one filter for example a colored or interference filter
  • the presence of the filter makes it possible to select a single wavelength and to more easily see a hidden or hardly visible element without the filter, in particular in the case of a complex multiton pattern consisting of a superposition of simple patterns of different colors.
  • the light source can be monochromatic, being in particular coherent and / or collimated light, the display plane being real and positioned after the security structure with respect to the light source.
  • the verification of the presence of an interference pattern can be done using a device equipped with a camera, in particular a portable telephone with focusing arranged in the viewing plane.
  • a device other than the eye makes it possible to avoid any danger for the eye related to a high light intensity, in particular in the case of the use of a laser.
  • the method may include the step of comparing an interference pattern generated by the diffractive optical element with a pattern present on the article, in particular defined by a watermark, a printing, a metallization or a demetallization or microperforations, or in a form that is not directly understandable, for example stored on an RFID chip or on a server which can be accessed through a link on the document.
  • the method may include the step of verifying that the data of the interference pattern correspond to data carried elsewhere by the document.
  • the latter can be arranged to automatically analyze the observed image and for example compare it with reference information, or decrypt it to extract information to compare with reference information, to verify the authenticity of the article, especially the document.
  • the electronic device can be arranged to analyze the interference pattern observed and access a database making it possible to verify the authenticity of the article, in particular of the document.
  • the article in particular the document, can carry information which allows access via a remote server to reference data which makes it possible to verify that the image observed comes from an authentic diffractive optical element.
  • This information can be stored in an RFID chip present on the document and read by the device used to observe the interference pattern, for example using NFC technology.
  • the secure article 10 shown in Figures 1 and 2 for example a document such as a banknote, comprises a security structure 2 according to the invention, comprising a diffractive optical element 40 overlapping at least partially with a non-opaque microzone 30.
  • the article 10 comprises a substrate 11, in particular made of paper, provided with a window 15 which visually gives access to the diffractive optical element 40.
  • the non-opaque microzone 30 is formed by a microperforation of axis X carried out through a substrate 18, in particular of paper, of the document 10, assembled with the substrate 11.
  • the diffractive optical element is produced on a film 43 of transparent plastic, which is assembled with a security element 20 having a non-opaque zone 23 at least partially superimposed on the diffractive optical element 40 and on the microperforation 30.
  • the thermoplastic film 43 can be made of polyethylene terephthalate (PET).
  • the diffractive optical element 40 generates an interference pattern in a distant viewing plane.
  • the at least partial alignment of the different openings and transparent zones defines a non-opaque zone A which goes on either side of the secure document 1.
  • the interference pattern of the safety structure 2 is displayed by lighting the non-opaque microzone 30 by a light source 60, in a plane 62 distant from the diffractive optical element 40.
  • the safety structure 2 is preferably arranged so that its plane is oriented orthogonally to the incident light coming from the light source 60 and that the non-opaque microzone 30 is preferably positioned on the side of the light source 60.
  • the non-opaque microzone 30 makes it possible in particular to target the diffractive optical element 40 with the incident beam.
  • the light source 60 is preferably collimated.
  • the light source 60 can be a monochromatic light source, in particular a laser.
  • the display plane 62 is then real and is positioned downstream of the security structure 2 with respect to the light source 60.
  • the interference pattern 66 can be displayed using a portable device, in particular of a portable telephone set in photo or video mode and positioned in the viewing plane 62. The interference pattern 66 is viewed through the non-opaque microzone 30.
  • the light source 60 can be a polychromatic source.
  • the display plane 62 is then virtual and positioned upstream of the security structure 2 with respect to the light source 60.
  • the interference pattern 66 is displayed by observing the light source 60 through the non-microzone opaque 30.
  • the authentication of the security structure 2 may require the use of a filter 68 positioned upstream or downstream of the security structure 2. This filter can make it possible to filter the wavelengths visible to the eye.
  • the authentication of the security structure 2 can be done by comparison of the interference pattern 66 generated by the diffractive optical element 40 with one or more additional pieces of information present on the security structure 2 or the article 10 associated for example with a comparison pattern defined by a watermark, printing, metallization or demetallization or microperforations.
  • the non-opaque microzone 30, being in particular a demetallization or a microperforation, can constitute, at least partially, the reason for comparison.
  • the invention is not limited to a particular secure article, and this may be other than a valuable document, in particular an identity document or a card.
  • Substrates 11 and 18 of the example of Figures 1 and 2 may thus be non-fibrous.
  • the diffractive optical element 40 can be formed on a thermoplastic film 43 according to one of the methods described above.
  • the thickness e of the diffractive optical element 40 is preferably less than or equal to 50 ⁇ m, better still less than or equal to 25 ⁇ m.
  • the diffractive optical element 40 can be, as illustrated on the figure 2 , of larger section than that of the non-opaque microzone 30.
  • the non-opaque microzone 30 preferably has a section S of less than 1,000,000 ⁇ m 2 , better less than or equal to 200,000 ⁇ m 2 , even better between 10 ⁇ m 2 and 200,000 ⁇ m 2 , even better between 5,000 ⁇ m 2 and 200,000 ⁇ m 2 .
  • the non-opaque microzone 30, when it is produced in the form of microperforation, can be arranged in various ways.
  • the non-opaque microzone 30 may have a variable cross section, in particular narrowing in the direction of the diffractive optical element 40.
  • a non-opaque microzone 30 formed by a microperforation whose axis X forms a non-zero angle ⁇ with the normal to the surface of the safety structure 2.
  • the angle ⁇ can be between -45 ° and 45 °.
  • the safety structure 2 can comprise at least two non-opaque micro-zones 30 1 and 30 2 opening onto the same surface S 12 , each non-opaque micro-zone 30 1 and 30 2 being able to be superimposed on a respective diffractive optical element 40 1 or 40 2 .
  • This configuration allows, by varying the viewing angle, to choose the diffractive optical element that one wishes to view. An animation can be observed if necessary by alternating the visualization of the two interference patterns.
  • the non-opaque microzone 30 can be produced other than in the form of a microperforation through an opaque layer.
  • the non-opaque microzone 30 can be filled with a transparent, colorless or non-opaque material.
  • the non-opaque microzone 30 can be delimited by a print 35.
  • the layer 38 on which the print is made can be a transparent film which carries, on the face opposite to the print, the diffractive optical element 40.
  • the non-opaque microzone 30 can be formed by demetallization of a metal layer 37, as illustrated in the figure 19 .
  • the security structure 2 may include an optical filter placed on the path of the light gaining or leaving the diffractive optical element.
  • a security structure 2 comprising an optical filter 80, absorbent or interference, in particular colored, superimposed on the non-opaque micro-zone 30.
  • the filter 80 can be positioned upstream or downstream from the diffractive optical element 40.
  • the filter 80 makes it possible to select one or more wavelengths of light when viewing the interference pattern.
  • the filter allows you to personalize the interference pattern by allowing the choice of display color.
  • the security structure 2 can comprise a plurality of diffractive optical elements 40 1 , ..., 40 i and respective non-opaque micro-zones 30 1 , ..., 30 i with respective axes X 1 , ..., X i , each non-opaque microzone 30 1 ; ...; 30 i superimposed on a diffractive optical element 40 1 ; ...; 40 i corresponding.
  • the security structure 2 can comprise a security element 20 comprising one or more non-opaque zones 23, each non-opaque zone overlapping at least partially with at least one diffractive optical element 40 1 , ..., 40 i .
  • a non-opaque zone 23 can be superimposed with at least two diffractive optical elements 40 1 , ..., 40 i .
  • the security structure 2 comprises a plurality of colored filters 60 1 , ..., 60 i , in particular of different colors, each superimposed on at least one respective diffractive optical element 40 1 , ..., 40 i .
  • the security structure 2 may include a security element 20 which is at least partially superimposed on the diffractive optical element 40 and on the non-opaque microzone 30. More particularly, as illustrated, this security element 20 may be visible at through the window 15 and come between the substrate 11 and the film 43 carrying the diffractive optical element 40.
  • the security element 20 is preferably at least partially opaque, for example being metallized.
  • the non-opaque zone 23 can be formed by demetallization or perforation.
  • the element 20 can provide visible security through the window 15, for example in the form of a pattern 50 situated outside of the non-opaque zone 23, this pattern 50 being for example formed by printing or demetallization, as illustrated in FIG. figure 1 .
  • the pattern 50 is for example made up of alphanumeric characters, as illustrated in the figure 1 . It can be a text providing information on the name of the bank, the country and / or the value of the denomination.
  • the pattern 50 can be produced in accordance with the teaching of application WO 2006/066927, in the form of halftone dots restoring an image in transmitted light, one of the demetallizations or perforations of the pattern 50 which can constitute the non-opaque microzone 30.
  • the pattern 50 is preferably found in part or totally in the interference pattern 66 generated by the diffractive optical element 40.
  • the pattern 50 representing the value of the cut is found in the interference pattern which also represents the value of the cut, the typography being able to be identical or different.
  • a security element 20 comprising a metallized layer
  • metallized layer as usable metals, mention may be made of aluminum, copper, gold, iron, silver, chromium , nickel, zinc, cadmium, bismuth and their alloys and oxides.
  • the security element 20 may be in the form of a patch, a wire or a security foil.
  • the security element 20 is a security wire
  • its width may be relatively small, preferably less than or equal to 10 mm.
  • the window 15 can be made by cutting and have an outline of any shape, for example circular, elliptical or polygonal, as illustrated in the figure 1 , in particular in the shape of a regular polygon or not.
  • Window 15 can be unique on the document or the latter can include several. In this case, the windows 15 can be arranged on the same side of the document or on opposite sides.
  • the window 15 can be formed by modifying for example the accumulation of fibers on the forming fabric and the non-opaque microzone 30 can be formed in particular using micro-needles or by water jet, preferably by laser ablation. .
  • the jets 11, 18 are for example fibrous jets assembled in the wet phase.
  • the two jets 11, 18 each have a thickness / of for example between 10 and 1000 ⁇ m, better still between 50 and 700 ⁇ m.
  • the two jets 11, 18 can comprise natural and / or synthetic fibers.
  • the substrates 11 and 18 can also be non-fibrous.
  • the document 10 may have a multilayer structure comprising at least one fibrous layer and one layer of thermoplastic material.
  • the diffractive optical element 40 is laminated with the security element 20 before being incorporated into the secure document 1.
  • the diffractive optical element 40 is fixed to the security element 20 by gluing, hot or cold.
  • the adhesive used is for example a transparent adhesive of the polymer adhesive type such as NOLAX.
  • the assembly consisting of the security element 20 and the diffractive optical element 40 can be incorporated between the two jets 11, 18, the security element 20 being positioned on the side of the window 15, as illustrated in the figure 2 .
  • article 10 may include various additional security elements, first level, second or third level.
  • additional security elements some are detectable by eye, in daylight or in artificial light, without the use of a particular device.
  • These security elements comprise for example colored fibers or boards, printed or metallized wires totally or partially. These security elements are said to be first level.
  • UV ultraviolet
  • IR infrared
  • Additional security elements require a more sophisticated detection device for their detection.
  • These security elements are for example capable of generating a specific signal when they are subjected, simultaneously or not, to one or more sources of external excitation. Automatic signal detection allows the document to be authenticated, if necessary.
  • These security elements include, for example, tracers in the form of active materials, particles or fibers, capable of generating a specific signal when these tracers are subjected to optronic, electrical, magnetic or electromagnetic excitation. These security elements are said to be third level.
  • At least one of these security elements can define information found in the interference pattern generated by the diffractive optical element 40.
  • the diffractive optical element 40 and the layer 18 defining the non-opaque microzone 30 may be in contact with one another, as is the case in particular in the example of the figure 2 .
  • the diffractive optical element 40 and the layer 18 defining the non-opaque microzone 30 can be separated by one or more intermediate layers.
  • the film 43 carrying the diffractive optical element 40 can be positioned adjacent to the substrate 11 comprising the window 15, and the security element 20 can be interposed between the film 43 and the non-opaque microzone 30.
  • the diffractive optical element 40 in particular the side of the film 43 carrying the latter, and the layer 18 are separated by a protective adhesive structure 45 preferably comprising a layer of a mixture of an adhesive material and an HRI material.
  • the protective adhesive structure 45 makes it possible to secure the film 43 carrying the diffractive optical element 40 and the layer 18.
  • the presence of the HRI material makes it possible to prevent attenuation or cancellation of the optical effects of the diffractive optical element which could be caused by the superimposition of adhesive material with the diffractive optical element 40.
  • the diffractive optical element 40 can, as a variant, carry a layer of an HRI material 47, in particular deposited on the diffractive optical element 40 by vaporization under vacuum, itself carrying a layer of an adhesive material.
  • the layer 47 makes it possible to protect the diffractive optical element 40 against attenuation or cancellation of its optical effect due to the presence of the adhesive structure.
  • the mechanical protection of the latter is obtained by the layer of adhesive material 46.
  • the diffractive optical element 40 in particular the side of the film 43 carrying the latter, and the layer 18 are separated by an adhesive structure 46 comprising an adhesive material and a protective structure 47 comprising an HRI material, the protective structure 47 being applied to the diffractive optical element 40, in particular on the side of the film 43 carrying the diffractive optical element 40 and the adhesive structure 46 being disposed between the protective structure 47 and the layer 18.
  • the protective structure 47 may include a binder, preferably secure.
  • the film 43 and the layer 18 are separated by an adhesive structure 46, the latter being located on the side of the film 43 not having the diffractive optical element 40.
  • a protective structure 47 comprising an HRI material may be present on the element diffractive optics 40, and in particular completely cover the latter. This protective structure 47 makes it possible in particular to mechanically protect the diffractive optical element 40 during assembly of the safety structure 2 with the article 10 while retaining the optical properties.
  • the film 43 and the layer 18 are separated by a protective structure 47 comprising a layer of HRI material 47a, a layer of a binder 47b and an adhesive structure 46 comprising an adhesive material.
  • the layer of HRI material 47a preferably covers at least partially the diffractive optical element 40 and the layer of binder 47b preferably covers the layer of HRI material 47a.
  • the binder is secure, in particular by one or more luminescent or absorbent substances under UV, visible and / or IR excitation.
  • the luminescent or absorbent substances are not diffusing and the binder layer 47b is transparent.
  • the luminescent or absorbent substances are preferably particles of nanometric sizes.
  • the layers 47a, 47b and 46 are transparent so as not to disturb the optical effect generated by the diffractive optical element.
  • the protective structure 47 can be deposited by printing on the diffractive optical element 40 as explained in the patent application FR 2961319 , that is to say that the hollows of the diffractive optical element 40 are filled with the HRI material
  • the protective structure 47 or the protective adhesive structure 45 may comprise nanoparticles of metal oxides, such as TiO2, having in particular a diameter between 1 and 100 nm, better between 5 and 25 nm and / or a transparent varnish and / or a crosslinkable organic binder and / or a pigment dispersant.
  • metal oxides such as TiO2
  • the thickness of the protective adhesive structure 45 is preferably between 1 and 10 microns, better still between 2 and 5 microns.
  • the adhesive structure 46 or the protective adhesive structure 45 is introduced by microperforations between the diffractive optical element 40, and / or the film 43 carrying it, and the layer 18.
  • layers 46 or 45 are introduced so as to fill the microperforations to protect them against the external environment, in particular dirt, as explained in the application DE 10 2011 004935 .
  • the security element 20 can be positioned in the window 15, the film 43 still extending between the two jets 11 and 18.
  • the diffractive optical element 40 can be produced in a film 43 which extends continuously around the diffractive optical element 40.
  • the film 43 which served to produce the diffractive optical element 40 does not extend to the beyond this, as illustrated in figure 5 .
  • the film 43 can be positioned in the window 15. It can be the same for the security element 20, when present.
  • the security structure 2 may include a diffractive optical element 40 and a security element 20 having a non-opaque microzone 30 overlapping at least partially with the diffractive optical element 40.
  • the first jet 11 may have a window 15 and the second jet 18 may have a non-opaque zone 32.
  • the window 15 and the non-opaque zone 32 may or may not have the same shape and size and overlap at least partially with the element diffractive optics 40 and the non-opaque microzone 30 so as to form a transparent transparent zone A on the secure document 1.
  • the security structure 2 can have substantially the same shape as the window 15 and position itself in the latter.
  • Secure document 1 shown in figure 9 , comprises two substrates 11, 18 constituted by first and second jets 11, 18 each provided with a microperforation 30, 16, preferably produced by laser ablation, and receive between them a diffractive optical element 40.
  • Secure document 1 shown in figure 11 , comprises a first substrate 11 forming the first jet, provided with a window 15, and a second substrate 18 forming the second jet, provided with a non-opaque microzone 30.
  • the window 15 and the microperforation 30 are superimposed so as to form in the secure document a transparent zone A which goes on either side of the secure document 1 in which is positions the diffractive optical element 40.
  • the diffractive optical element 40 can be positioned between the two jets 11, 18, the film 43 being directly in contact with the latter.
  • the optical security element 40 can be positioned between a substrate 18 and a security element 20, the substrate comprising the non-opaque microzone 30.
  • the security element 20 may include a pattern 50, here the letters AW, produced by a plurality of microperforations 19, one of these microperforations possibly constituting the non-opaque microzone 30, for example the tip of A.
  • the motif AW can be reproduced on the interference pattern generated by the diffractive optical element 40.
  • the non-opaque microzone 40 can be of various shapes, in particular circular, as illustrated in the figure 1 , or any other, for example triangular as illustrated on the figure 28A , or in the shape of a crescent, as illustrated on the figure 28B .

Landscapes

  • Credit Cards Or The Like (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Printing Methods (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
EP14733373.6A 2013-06-10 2014-06-10 Structure de securite a element optique diffractif Active EP3007903B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1355344A FR3006795B1 (fr) 2013-06-10 2013-06-10 Structure de securite a element optique diffractif
PCT/IB2014/062097 WO2014199296A1 (fr) 2013-06-10 2014-06-10 Structure de securite a element optique diffractif

Publications (2)

Publication Number Publication Date
EP3007903A1 EP3007903A1 (fr) 2016-04-20
EP3007903B1 true EP3007903B1 (fr) 2020-05-20

Family

ID=49322498

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Application Number Title Priority Date Filing Date
EP14733373.6A Active EP3007903B1 (fr) 2013-06-10 2014-06-10 Structure de securite a element optique diffractif

Country Status (5)

Country Link
EP (1) EP3007903B1 (enExample)
JP (1) JP2016530118A (enExample)
AU (1) AU2014279723B2 (enExample)
FR (1) FR3006795B1 (enExample)
WO (1) WO2014199296A1 (enExample)

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DE102015010334A1 (de) * 2015-08-07 2017-02-09 Giesecke & Devrient Gmbh Sicherheitselement
GB2542783B (en) 2015-09-29 2018-02-07 De La Rue Int Ltd Security print media and method of manufacture thereof
TWI699293B (zh) * 2015-10-02 2020-07-21 日商凸版印刷股份有限公司 僞造防止構造體
US10479128B2 (en) * 2017-10-27 2019-11-19 Assa Abloy Ab Security feature
FR3080324B1 (fr) 2018-04-23 2022-04-01 Oberthur Fiduciaire Sas Feuille securisee
FR3085974B1 (fr) 2018-09-14 2020-12-18 Oberthur Fiduciaire Sas Procede de fabrication d'un materiau en feuille, machine, materiau en feuille et document de securite correspondants

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DE2451732A1 (de) * 1974-10-31 1976-05-06 Unitec Gmbh & Co Kg Identitaetstraeger und lesegeraet dafuer
DE69918529T2 (de) 1998-01-21 2005-08-18 Securency Pty. Ltd., Craigieburn Methode zur überprüfung der echtheit von wertpapieren und ausweisen und dokumente für die anwendung dieser methode
AUPQ125999A0 (en) 1999-06-28 1999-07-22 Securency Pty Ltd Method of producing a diffractive structure in security documents
CA2578012C (en) * 2004-08-27 2012-03-27 Kxo Ag Security document with a volume hologram forming a partial motif
EP1674286B1 (en) 2004-12-23 2011-03-02 Arjowiggins Security Security element having a digitised mark and security support or document comprising same
EP1977399A4 (en) 2006-01-16 2010-09-01 Securency Int Pty Ltd STORING DATA IN A DIFFRACTIVE OPTICAL ELEMENT
WO2008031170A1 (en) * 2006-09-15 2008-03-20 Securency International Pty Ltd Radiation curable embossed ink security devices for security documents.
AU2007306918B2 (en) * 2006-10-12 2014-02-20 Ccl Secure Pty Ltd A security document with micro-prisms
MTP4301B (en) 2010-03-25 2011-10-26 Securency Int Pty Ltd High refractive index coatings and their use in the protection of surface relief structures
DE102010015302A1 (de) * 2010-04-14 2011-10-20 Bundesdruckerei Gmbh Selbstverifizierendes optisches Sicherheitselement
DE102011004935A1 (de) 2011-03-01 2012-09-06 Bundesdruckerei Gmbh Verbundkörper und Verfahren zur Herstellung eines Verbundkörpers mit einem innenliegenden Sicherheitsmerkmal
AU2011101567B4 (en) 2011-11-30 2012-08-09 Innovia Security Pty Ltd Diffractive device
AU2013100172B4 (en) 2013-02-19 2013-08-22 Ccl Secure Pty Ltd Security device with covert images

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Also Published As

Publication number Publication date
AU2014279723A1 (en) 2015-12-24
JP2016530118A (ja) 2016-09-29
WO2014199296A1 (fr) 2014-12-18
EP3007903A1 (fr) 2016-04-20
FR3006795A1 (fr) 2014-12-12
AU2014279723B2 (en) 2018-04-26
FR3006795B1 (fr) 2016-12-09

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