EP1951528B1 - Optical structure, especially for a security document and/or a document of value - Google Patents

Optical structure, especially for a security document and/or a document of value Download PDF

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Publication number
EP1951528B1
EP1951528B1 EP06831348A EP06831348A EP1951528B1 EP 1951528 B1 EP1951528 B1 EP 1951528B1 EP 06831348 A EP06831348 A EP 06831348A EP 06831348 A EP06831348 A EP 06831348A EP 1951528 B1 EP1951528 B1 EP 1951528B1
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EP
European Patent Office
Prior art keywords
structure
interface
microreliefs
preceding
structure according
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.)
Active
Application number
EP06831348A
Other languages
German (de)
French (fr)
Other versions
EP1951528A1 (en
EP1951528B2 (en
Inventor
Michel Camus
Henri Rosset
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArjoWiggins Security Sas
Original Assignee
Arjo Wiggins SA
ArjoWiggins Security Sas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
Priority to FR0553480A priority Critical patent/FR2893424B1/en
Application filed by Arjo Wiggins SA, ArjoWiggins Security Sas filed Critical Arjo Wiggins SA
Priority to PCT/FR2006/051186 priority patent/WO2007057613A1/en
Publication of EP1951528A1 publication Critical patent/EP1951528A1/en
Publication of EP1951528B1 publication Critical patent/EP1951528B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36764044&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1951528(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of EP1951528B2 publication Critical patent/EP1951528B2/en
Application granted granted Critical
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/324Reliefs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29Securities; Bank notes
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D2035/00Nature or shape of the markings provided on identity, credit, cheque or like information-bearing cards
    • B42D2035/12Shape of the markings
    • B42D2035/20Optical effects

Abstract

The present invention relates to an optical structure, especially for a security document and/or a document of value, comprising: first and second opposed outer faces, at least a first interface which includes a first array of microreliefs and is placed so that, upon passing through this first interface in the direction from the first outer face to the second outer face, light passes from a first medium having a first refractive index to a second medium having a second refractive index, greater than the first, at least a second interface comprising a second array of microreliefs and placed so that, upon passing through this second interface in the direction from the first outer face to the second outer face, light passing from a third medium having a third refractive index to a fourth medium having a fourth refractive index, less than the third, each interface having at least one portion offset relative to the other interface when the structure is observed along a direction approximately perpendicular to at least one of the outer faces.

Description

  • The present invention relates to an optical structure, in particular for a security document and / or value.
  • We know by international demand WO 03/082598 a document with, on one side, a security device comprising two superimposed structures, each of which can generate a holographic image. Depending on the angle of observation, the holographic image of one or other of the structures appears.
  • The patent US 5,301,981 describes a ribbon comprising, on a first face, microreliefs forming a lenticular network. The ribbon has, on a second face opposite to the first, a succession of parallel black strips arranged so that, when the ribbon is observed in a direction perpendicular to its plane, the light beams are directed by the microreliefs on the strips. black. This gives a black image forming a screen to hide information on a document on which the ribbon is affixed.
  • We know by international demand WO 02/03104 an optical structure capable of creating a first image, for example holographic, in reflection and a second image in transmission.
  • We still know by international demand WO 03/055692 a document on which is applied a prismatic relief structure which is totally reflective under a certain angle of observation so as to mask information on the document, and transparent from another angle of observation so as to make this information apparent.
  • The patent CH 691750 shows an optical structure with two microstructures.
  • The invention aims to provide an optical structure, particularly for a security document and / or value, to create new optical effects in particular to enhance the security of the document against a possible attempt to counterfeit.
  • The invention thus has, according to one of its aspects, an optical structure, in particular for a security document and / or of value, comprising:
    • first and second opposite outer faces,
    • at least one first interface comprising a first microrelief network and arranged so that, when this first interface is crossed in the direction of the first outer face towards the second outer face, one passes from one first medium having a first refractive index at a second medium having a second refractive index greater than the first
    • at least one second interface comprising a second network of microreliefs and arranged so that, when this second interface passes through the direction of the first outer face to the second outer face, a third medium having a second third index of refraction to a fourth medium having a fourth refractive index less than the third,
    each interface having at least one portion offset from the other interface when the structure is observed in a direction substantially perpendicular to at least one of the outer faces.
  • The interfaces may for example generate optical effects, possibly variable depending on the angle of observation, which are different from one interface to another.
  • The invention thus makes it possible to create, in visible and / or infrared and / or ultraviolet light, new visual effects in order, for example, to improve the aesthetics of a document and / or the security thereof against an attempt to infringement.
  • The interfaces may, if necessary, be entirely offset relative to each other, that is to say without overlapping portions.
  • When at least one of the interfaces has a contour defining a pattern, positive or negative, this pattern may have a different visual appearance of the visual appearance of an area surrounding it.
  • The pattern may comprise for example an alphanumeric character, a symbol, a logo or a drawing.
  • In an exemplary implementation of the invention, at least one of the microrelief arrays is superimposed at least partially, in particular exactly, on a substantially smooth zone, devoid of microrelief, of one of the outer faces.
  • At least one of the interfaces may be formed for example on one of the outer faces of the structure.
  • At least one of the first and fourth media may be formed by the ambient air.
  • The second and third media may be formed for example by the same material and have the same refractive index, especially a material having a refractive index greater than 1, especially 1.5, for example 2.
  • Alternatively, the second and third media may be formed by different materials and / or having different refractive indices.
  • The first medium may be formed for example by a first material on which the first micro-relief array is made and the second medium by a second deposited material, in particular by vacuum deposition, on the first material.
  • The second material may partially or wholly cover the first material and form, if desired, at least one pattern. The second material may form, if necessary, an outer protection of the optical structure and have a refractive index, for example greater than 1.8.
  • The second material can be obtained for example by vaporization, for example zinc sulphide having a refractive index of about 2.3.
  • Preferably, the difference between the second refractive index and the first refractive index is greater than 0.1, more preferably 0.15, preferably 0.2 or 0.3 or 0.4. Preferably, this difference is between 0.4 and 0.6.
  • Preferably, the difference between the third refractive index and the fourth refractive index is greater than 0.1, more preferably 0.15, preferably 0.2 or 0.3 or 0.4. Preferably, this difference is between 0.4 and 0.6.
  • In an exemplary implementation of the invention, at least one of the interfaces is arranged so that, for at least a first range of observation angles, a portion of the structure at the right of this interface appears substantially transparent when the structure is observed from one of the first and second outer faces, especially in visible light and / or infrared and / or ultraviolet.
  • At least one of the interfaces may be arranged so that, for at least a second range of observation angles, a portion of the structure at the right of this interface appears substantially reflective when the structure is observed from a face outside, especially in visible light and / or infrared and / or ultraviolet.
  • Advantageously, at least one of the interfaces is arranged in such a way that, for a first range of observation angles, a portion of the structure at the right of this interface appears substantially transparent when the structure is observed from an outside face. predetermined and, for a second range of viewing angles, this portion of the structure appears substantially reflective when the structure is observed from said outer face.
  • Thus, when the interface or interfaces have a contour defining a pattern, it may appear, in visible light, with a reflective or transparent appearance depending on the viewing angle of the structure.
  • The invention can, if necessary, allow, by varying the angle of observation, to see the pattern successively positive, with a reflective appearance and surrounded by a transparent zone and, in negative, with a transparent appearance surrounded by a reflective area.
  • In an exemplary implementation of the invention, at least one of the microreliefs has substantially a triangular prism shape.
  • The network of microreliefs may be arranged for example so as to restore a metallized appearance, especially reflecting, when the optical structure is observed in a predetermined range of angles.
  • For example, the microrelief array (s) may be similar to that present on the film marketed by 3M under the name Scotch Optical Lighting Film.
  • In another exemplary embodiment of the invention, at least one of the microreliefs comprises at least one curved, concave or convex surface, each curved surface being able to create a lens effect.
  • The curved surface may for example be a half-cylindrical surface or spherical cap, in particular half-spherical, this list not being limiting.
  • Preferably, the microreliefs have a thickness greater than the wavelengths of visible light, possibly near-infrared or ultraviolet radiation.
  • The microreliefs may have a thickness, for example, greater than 1 μm.
  • The thickness of the microreliefs is preferably less than 10 mm, especially 1 mm.
  • In an exemplary implementation of the invention, at least a portion of the microreliefs extends in a longitudinal direction, the microreliefs being substantially parallel to each other.
  • The microreliefs respectively of the first and second networks may be identical or, alternatively, different, for example having different shapes and / or dimensions.
  • The microreliefs of the first and second networks can be made on a common support, on the same face of this support or on two opposite faces thereof.
  • The optical structure may comprise, for example, a support with at least one micro-relief array on one side, the microrelief network being partially covered with a coating layer having a refractive index higher than that of the support, so that the first interface is formed between the support and the ambient air and the second interface between the support and the coating layer, the first and second interfaces being in particular adjacent. The coating layer may comprise, for example, zinc sulphide.
  • The optical structure according to the invention can thus be made relatively easily because a single set of microreliefs can be used to form the two interfaces.
  • In another exemplary embodiment of the invention, the first and second microrelief networks may be made on separate supports.
  • The structure may comprise, if desired, at least one electrically conductive material.
  • The authentication and / or the identification of the structure can thus be based on a measurement of the electrical conductivity of the latter, in addition to its visual observation.
  • In an exemplary implementation of the invention, the structure comprises at least one support on which at least a portion of the microreliefs is made, the support being in particular made of a substantially transparent polymer material, such as polyester or PMMA ( polymethylmethacrylate).
  • The support may comprise an electrically conductive layer, for example based on a conductive polymer such as polythiophene or its derivatives or based on an indium tin oxide composite.
  • The structure may be devoid of metal, in particular a metallized layer.
  • In an exemplary implementation of the invention, the optical structure may have a strip shape with a width in particular between 1.5 mm and 100 mm, in particular between 2 mm and 45 mm.
  • The structure may alternatively have a shape chosen from: a polygonal shape, for example rectangular or square, an oval shape, a circular shape, this list not being limiting.
  • Where appropriate, the structure may be arranged to be able to be transferred at least partially to a face of a document, the structure may comprise at least one layer of adhesive.
  • The structure may comprise, in addition to the microrelief network, at least one authentication and / or identification element chosen from at least one of the following elements: an element for highlighting a falsification, in particular visible and or detectable by means of a specific detection device, an element with variable, interferential and / or diffractive, iridescent or liquid crystal optical effect, a magnetic coating, tracers detectable by X-ray fluorescence, biomarkers, a varnish or an ink, luminescent, fluorescent or phosphorescent tracers, photochromic, thermochromic, electroluminescent and / or piezochromic compounds and / or which change color in contact with one or more predetermined products.
  • The structure may comprise, where appropriate, at least one fluorescent material under infrared and / or ultraviolet radiation, deposited for example in the form of a layer, in particular on one of the faces of the structure.
  • The invention can thus make it possible to observe, in visible light, under infrared and / or ultraviolet radiation excitations, an underlying fluorescent layer, through the portion of the structure appearing transparent for the first range of observation angles. .
  • For the second range of observation angles, the aforementioned portion of the structure, being reflective, does not allow the observation of the fluorescence of the underlying layer.
  • The invention further relates, in another of its aspects, independently or in combination with the foregoing, to an optical structure comprising at least one array of microreliefs arranged so that, for a first range of angles of observation, the portion of the structure covered by the network appears substantially reflective when viewed from a predetermined face and, for a second range of observation angles, this portion appears substantially transparent when the structure is observed from said face.
  • In an exemplary implementation of the invention, the structure is arranged so that, when viewed at a predetermined angle and from a predetermined face, the structure has both at least one substantially transparent zone and at least one less a substantially reflective zone.
  • The invention further relates, in another of its aspects, a sheet material comprising an optical structure as defined above.
  • The term "sheet material" may denote in the description and the claims a fibrous sheet based on cellulosic and / or synthetic fibers, having a monolayer or multilayer structure, composite or not. A sheet material may for example have a relatively small thickness, especially less than or equal to 3 mm, for example equal to about 100 microns, and be flexible. In an exemplary implementation of the invention, the sheet material may be packaged in a reel, in particular before being cut into the desired format. The expression "sheet material" can also denote a flexible or rigid film with a monolithic or multilayer structure.
  • The optical structure advantageously comprises at least one apparent portion on one side of the sheet material.
  • The optical structure may be partially embedded in the mass of the sheet material, the latter including in particular at least one window leaving the optical structure unobstructed.
  • When the optical structure has a strip shape, it may extend from a first edge of the sheet material to a second edge opposite the first.
  • Alternatively, the optical structure is disposed on one side of the sheet material, for example being glued to this face.
  • In an exemplary implementation of the invention, the sheet material comprises at least one piece of information such as an alphanumeric character, a symbol, a logo or a drawing, the optical structure being arranged so as to be able to mask substantially the information element when this structure is observed in a first range of angles and has a reflective appearance.
  • The sheet material may comprise at least one fibrous layer or, alternatively, a plastics material.
  • Depending on the case, at least one of the first and second outer faces of the optical structure may be in contact with the ambient air or the fibrous material of the sheet material.
  • The invention further relates, in another of its aspects, a security document and / or value comprising a sheet material as defined above.
  • The document may be one of the following: a bank note, an identity document, a passport sheet or cover, a visa, a coupon, a document of value other than a bank note, for example a check or a credit card, a label of protection and / or authentication, a label of traceability.
  • The invention can be better understood on reading the following detailed description, non-limiting examples of implementation of the invention, and on examining the appended drawing, in which:
    • the Figures 1 and 2 represent, schematically and partially, an optical structure according to the invention, respectively observed at two different angles,
    • the figure 3 illustrates, schematically and partially, a network of microreliefs of the optical structure of Figures 1 and 2 ,
    • the figure 4 very schematically illustrates the beam of light beams in the structure of the figure 3 ,
    • the figure 5 represents, schematically and partially, in section, the optical structure of the figure 1 ,
    • the Figures 6 and 7 represent, schematically and partially, two documents according to examples of the invention,
    • the figure 8 represents, schematically and partially, in perspective, a packaging according to the invention, and
    • the Figures 9 to 16 show, schematically and partially, in section, various examples of optical structures according to the invention.
  • In the drawing, for the sake of clarity, the relative proportions of the various elements represented have not always been respected, the views being schematic.
  • We have shown on Figures 1, 2 and 5 an optical structure 1 according to an exemplary implementation of the invention, having first and second opposite outer faces 2 and 3.
  • The optical structure 1 comprises on each of the faces 2 and 3 at least one microrelief network 5 extending over a portion 4 only of the corresponding face 2 or 3, as shown in FIG. figure 5 .
  • The structure 1 has a first interface 11, respectively a second interface 12, formed by the microrelief array or networks 5 of the first face 2, respectively the second face 3, as illustrated in FIG. figure 5 .
  • Each network 5 comprises in the example in question microreliefs 6 represented in FIG. figure 3 , in the form of a triangular prism each having dimensions, in cross section, greater than the wavelengths of visible light, and possibly near-infrared radiation. These dimensions, in particular the thickness e of the microreliefs, may for example be greater than 1 μm, especially 1.2 μm.
  • For example, the distance d between the vertices of two adjacent prisms may be between 100 microns and 900 microns, being for example close to 350 microns.
  • The thickness e of a prism can be for example between 50 microns and 300 microns, for example being close to 170 microns.
  • The maximum thickness E of the optical structure 1 may be between 100 μm and 900 μm, being for example close to 500 μm.
  • As illustrated on the figure 3 , the angle α between a local normal X to the optical structure 1 and a face of a microrelief 6 may be between 30 ° and 60 °, being for example close to 45 °.
  • The dimensions and the angles of the microreliefs 6 are advantageously chosen as a function of the refractive index of the material or materials used in the structure 1.
  • The microreliefs 6 form parallel striations in the example under consideration.
  • The microrelief network 5 may for example be similar to that present on the film marketed by the American company 3M under the name Scotch Optical Lighting Film.
  • The structure 1 is preferably flexible, for example being able to be foldable.
  • The microreliefs 6 are made of a material 15 having a refractive index greater than that of air, this material may be for example a transparent polymer such as polyester or PMMA.
  • The microreliefs 6 can be obtained for example by etching, mechanical or chemical.
  • Alternatively, the microreliefs 6 can be obtained by printing an ink or by embossing.
  • When crossing the first interface 11 in the direction of the first face 2 towards the second face 3, a first medium of refractive index n 1 (formed by the ambient air) is passed to a second medium ( formed by the material 15) of refractive index n 2 higher than n 1 .
  • When crossing the second interface 12 in the direction of the first face 2 to the second face 3, passing from a third medium of index n 3 (formed by the material 15, with n 3 = n 2 ) to a fourth medium (formed by the ambient air) of refractive index n 4 weaker. So we have n 4 = n 1 .
  • Each array of microreliefs 5 on the face 2, respectively on the face 3, is superimposed exactly on a substantially smooth zone 8 of the other face.
  • As illustrated on the figure 4 a light beam A entering the optical structure 1, at a portion 4 of the second face 3 having a microrelief network 5, with an angle in the range [a 1 ; a 2 ] relative to the normal X, is reflected by the opposite face 2, so that the portion of the structure 1 to the right of the network 5 appears with a reflective appearance.
  • A light beam B entering the optical structure, at the portion 4, with an angle in the range] to 0 ; a 1 ] relative to the normal X, spring by the opposite face 2 so that the portion of the structure 1 to the right of the network 5 appears with a transparent appearance.
  • The angles at 0 , a 1 , and a 2 may for example be substantially equal to 0 °, 45 ° and 90 °, respectively.
  • A light beam C entering the optical structure 1, at a substantially smooth zone 8 of the first face 2, with an angle in the range [a 3 ; a 4 ] with respect to the normal X, is reflected by the microrelief network 5 on the opposite face 3 so that the portion of the structure at the right of the grating 5 appears with a substantially reflective appearance.
  • A light beam D entering the optical structure 1 through the zone 8 with an angle in the range [a 4 ; 5 ] relative to the normal X, spring by the opposite face 3 so that the portion of the structure 1 to the right of the network 5 appears with a substantially transparent appearance.
  • The angles at 3 , 4 and 5 may for example be substantially equal to 0 °, 45 ° and 90 °, respectively.
  • The at least one microrelief network 5 may define, in positive or in negative, at least one pattern 10 formed for example by a text, a symbol, a logo and / or a drawing.
  • When the optical structure 1 is observed from the face 2 according to a first range of angles, corresponding for example to the interval [a 4 ; 5 ], the pattern 10 may appear substantially transparently surrounded by a substantially reflective zone, as illustrated in FIG. figure 1 .
  • When the structure 1 is observed from the face 2 according to a second range of angles, corresponding for example to the interval [a 3 ; 4 ], the pattern 10 may appear with a substantially reflective appearance surrounded by a substantially transparent area as shown in FIG. figure 2 .
  • The structure 1 may comprise, where appropriate, a succession of patterns 10 repeating regularly in one direction.
  • The network of microreliefs 5 may be arranged to restore a reflective metal appearance depending on the viewing angle.
  • The material on which the microrelief arrays 5 are formed may be based on a transparent polymer.
  • The structure 1 may have a strip shape with a width in particular between 1.5 mm and 100 mm.
  • We have shown on the figure 6 a security document and / or value 20 constituted by a bank note, this document comprising a sheet material 21 formed by a fibrous layer in which the optical structure 1 is partially embedded.
  • The structure 1 extends from a first edge 23 of the sheet material 21 to a second edge 24 opposite to the first.
  • The sheet material 21 may comprise one or more windows 22 leaving the optical structure 1 unobstructed.
  • The window or windows may be made for example by means of reliefs present on a rotating roll cylinder of a paper machine used to manufacture the sheet material, as described for example in patent applications. EP 0 860 298 and EP 0 625 431 .
  • We have shown on the figure 7 an optical structure 1 having a shape, for example substantially rectangular, this structure 1 being affixed on one side of the sheet material 21, without being embedded in the mass of this material 21, being for example glued on with a layer adhesive, possibly under temperature and pressure.
  • The optical structure 1 may be arranged to mask at least one information element 25 present on the sheet material 21 when the structure 1 appears with a reflective appearance. The information element 25 becomes visible through a portion 26 of the structure 1 when the latter is observed at an adequate viewing angle.
  • The information element 25 may for example be printed on one side of the sheet material 21.
  • Document 20 may alternatively be one of the following: an identity document, a passport sheet or cover, a visa, a coupon, a valuable document other than a banknote, for example a check or a credit card, a label of protection and / or authentication, a label of traceability.
  • We have shown on the figure 8 a packaging device 30 such as a package, for example a box, with an optical structure 1 affixed to a face 31 of the box 30.
  • The optical structure 1 may comprise, in addition to the microrelief network or networks 5, at least one authentication and / or identification element chosen from at least one of the following elements: a highlighting element of a falsification, in particular visible and / or detectable by means of a specific detection device, an element with variable, interferential and / or diffractive, iridescent or liquid crystal effect, a magnetic coating, tracers detectable by X-ray fluorescence, biomarkers, a varnish or an ink, luminescent, fluorescent or phosphorescent tracers, photochromic, thermochromic, electroluminescent and / or piezochromic compounds and / or which change color in contact with one or more predetermined products.
  • The optical structure 1 may comprise a monolithic support 29 based on the material 15, on the faces 2 and 3 of which the micro-relief arrays 5 are formed, as illustrated in FIG. figure 5 .
  • Alternatively, as illustrated on the figure 9 the optical structure 1 may comprise a monolithic support 30 such as a film, having a first completely smooth face 31 and, on a second face 32 opposite the first face 31, portions 4 covered by one or more networks 5 of separated microreliefs by zones 8 substantially smooth.
  • The structure 1 further comprises at least one element 33 of smaller area than the support 30 and fixed, for example by gluing, on the face 31 of the support 30, which element 33 comprises on one face an array of microreliefs 5 covering exactly a substantially smooth zone 8 of the face 32 of the support 30.
  • The outer face 2 of the structure 1 is formed both by the face 31 of the support 30 and the microrelief network 5 of the element 33.
  • The microreliefs 5 may, for example, initially be present on the entire face 32 of the support 30 and some of these microreliefs are subjected to a treatment to be eliminated, for example by etching or by mechanical action, in order to create the substantially smooth zones 8.
  • In the example shown in figure 10 the optical structure 1 is formed of a plurality of elements 33 arranged on either side of an intermediate support 35 formed for example by a transparent film, so that a network of microreliefs 5 of a element 33 on one side of the support 35 is arranged in line with a zone 36 without element 33 of the other face of the support.
  • Alternatively, as illustrated on the figure 11 the elements 33 may be arranged on the same side of the support 35 formed for example by a transparent adhesive film. At least one of the elements 33 may come for example from the cutting of a monolithic support 30 with microreliefs, at least one of the elements 33 being returned and returned to the space left by the cut.
  • In the example shown in figure 12 , the optical structure 1 comprises two supports 30 with microreliefs, fixed on two opposite faces of an intermediate support 35.
  • In the example shown in figure 13 , the optical structure 1 is covered on each of its two opposite faces 2 and 3 with a layer of a coating 37 such as a transparent varnish. The assembly 39 thus formed has substantially smooth outer faces.
  • The layers 37 on the faces 2 and 3 may have identical refractive indices or not.
  • We illustrated on the figure 16 an optical structure 50 having, on each of the opposite faces 51 and 52, at least one microrelief network 53, each microrelief having substantially a half-cylinder shape.
  • Each microrelief network 53 extends opposite a substantially smooth portion 54 of the opposite face.
  • The microreliefs 53 form lenses producing different optical effects depending on whether the light beam first passes through the microrelief network 53 or the substantially smooth zone 54, as can be seen from the paths of the light beams F and G on the figure 16 .
  • The characteristics of the various embodiments described can be combined with each other within the variants that are not illustrated.
  • The expression "having one" shall be understood as being synonymous with "having at least one", unless the opposite is specified.

Claims (15)

  1. Optical structure, especially for a security document and/or a document of value, comprising:
    - opposed first and second outer faces (2, 3)
    - at least one first interface (11), comprising a first network of microreliefs (5), and arranged in such a way that, when there is crossing of this first interface in the direction from the first outer face towards the second outer face, there is passing from a first medium having a first refraction index (n1) to a second medium having a second refraction index (n2), which is greater than the first;
    - at least one second interface (12) comprising a second network of microreliefs (5) and arranged in such a way that, when there is crossing of this second interface in the direction from the first outer face towards the second outer face, there is passing from a third medium having a third refraction index (n3) to a fourth medium having a fourth refraction index (n4), which is less than the third;
    each interface having at least one portion offset in relation to the other interface when the structure is observed following a direction (x) approximately perpendicular to at least one of the outer faces.
  2. Structure according to the preceding Claim, in which the interfaces are entirely offset in relation to one another when the structure is observed following said direction approximately perpendicular to at least one of the outer faces.
  3. Structure according to any one of the preceding Claims, in which at least one of the networks of microreliefs is superimposed at least partially, in particular exactly, in an area approximately flush with one of the outer faces.
  4. Structure according to any one of the preceding Claims, in which at least one of the interfaces is formed on at least one of the outer faces of the structure.
  5. Structure according to any one of Claims 1 to 4, in which the second and third media are formed by different materials and/or having different refraction indices.
  6. Structure according to any one of the preceding Claims, in which the first medium is formed by a first material on which the first network of microreliefs is formed, and the second medium is formed by a second material deposited, in particular by vacuum deposition, on the first material.
  7. Structure according to any one of the preceding Claims, in which at least one of the interfaces is arranged in such a way that, for at least a first range of observation angles, a portion of the structure to the right of this interface appears essentially transparent when the structure is observed from one of the first and second outer faces.
  8. Structure according to any one of the preceding Claims, in which at least one of the interfaces is arranged in such a way that, for at least one second range of observation angles, a portion of the structure to the right of this interface appears essentially reflective when the structure is observed from an outer face.
  9. Structure according to Claims 7 and 8, in which at least one of the interfaces is arranged in such a way that, for a first range of observation angles, a portion of the structure to the right of this interface appears essentially transparent when the structure is observed from a predetermined outer face, and, for a second range of observation angles, this portion of the structure appears essentially reflective when the structure is observed from an outer face.
  10. Structure according to any one of the preceding Claims, in which at least one of the microreliefs presents essentially the shape of a triangular prism.
  11. Structure according to the preceding Claim, in which the network of microreliefs is arranged in such a way as to create a metallised appearance, in particular reflective, when the optical structure is observed following a prearranged range of angles.
  12. Structure according to any one of the preceding Claims, in which the microreliefs have a thickness greater than the wavelengths of visible light, in particular from radiation close to infra-red, in particular greater than 1 µ.
  13. Structure according to any one of the preceding Claims, in which the difference between the second refraction index and the fourth refraction index is greater than 0.1.
  14. Film material comprising an optical structure according to any of the preceding Claims.
  15. Material according to Claim 14, comprising at least one element of information, the optical structure being arranged in such a way as to be able essentially to mask the element of information when the optical structure is observed according to a first range of angles and has a reflective appearance.
EP06831348.5A 2005-11-16 2006-11-16 Optical structure, especially for a security document and/or a document of value Active EP1951528B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0553480A FR2893424B1 (en) 2005-11-16 2005-11-16 Optical structure, in particular for a document of security and / or value.
PCT/FR2006/051186 WO2007057613A1 (en) 2005-11-16 2006-11-16 Optical structure, especially for a security document and/or a document of value

Publications (3)

Publication Number Publication Date
EP1951528A1 EP1951528A1 (en) 2008-08-06
EP1951528B1 true EP1951528B1 (en) 2009-02-25
EP1951528B2 EP1951528B2 (en) 2015-06-24

Family

ID=36764044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06831348.5A Active EP1951528B2 (en) 2005-11-16 2006-11-16 Optical structure, especially for a security document and/or a document of value

Country Status (9)

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US (1) US8439402B2 (en)
EP (1) EP1951528B2 (en)
AT (1) AT423687T (en)
BR (1) BRPI0618742A2 (en)
CA (1) CA2629926A1 (en)
DE (1) DE602006005395D1 (en)
ES (1) ES2322874T5 (en)
FR (1) FR2893424B1 (en)
WO (1) WO2007057613A1 (en)

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Also Published As

Publication number Publication date
FR2893424A1 (en) 2007-05-18
DE602006005395D1 (en) 2009-04-09
ES2322874T3 (en) 2009-06-30
US8439402B2 (en) 2013-05-14
ES2322874T5 (en) 2015-09-18
WO2007057613A1 (en) 2007-05-24
BRPI0618742A2 (en) 2011-09-13
FR2893424B1 (en) 2008-01-25
EP1951528A1 (en) 2008-08-06
CA2629926A1 (en) 2007-05-24
EP1951528B2 (en) 2015-06-24
US20090121473A1 (en) 2009-05-14
AT423687T (en) 2009-03-15

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