EP1951528A1 - 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

Info

Publication number
EP1951528A1
EP1951528A1 EP06831348A EP06831348A EP1951528A1 EP 1951528 A1 EP1951528 A1 EP 1951528A1 EP 06831348 A EP06831348 A EP 06831348A EP 06831348 A EP06831348 A EP 06831348A EP 1951528 A1 EP1951528 A1 EP 1951528A1
Authority
EP
European Patent Office
Prior art keywords
structure
preceding
structure according
microreliefs
interface
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.)
Granted
Application number
EP06831348A
Other languages
German (de)
French (fr)
Other versions
EP1951528B2 (en
EP1951528B1 (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
Application granted granted Critical
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(A1) "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 status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/324Reliefs
    • 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

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

The present invention relates to an optical structure, in particular a security document and / or value.

by the international application WO 03/082598 discloses a document with, on one side, a safety device comprising two superimposed structures, each capable of generating a holographic image. Depending on the angle of observation, the holographic image of either of the structures appears.

US Patent 5,301,981 describes a tape comprising on a first side of the microreliefs forming a lens array. The present ribbon, on a second face opposite the first, a series of parallel black strips disposed so that when the tape is observed in a direction perpendicular to its plane, the light beams are directed by the microrelief on the strips black. This gives a black image forming a screen to hide the information on a document on which the tape is affixed. It is known from international patent application WO 02/03104 an optical structure capable of creating a first image holographically example, reflection and a second image transmission.

International demand also known from WO 03/055692 a document on which is applied a prismatic relief structure which is totally reflecting at an angle of observation so as to hide the information on the document, and transparent from another angle observation of so as to make visible the information.

The invention aims at providing an optical structure, including a security document and / or value, to create new optical effects in particular to strengthen the security of the document against any attempt of forgery.

The invention thus provides, according to one aspect, an optical structure, in particular a security document and / or value, comprising: first and second opposed outer faces, - at least a first interface having a first network of microreliefs and arranged so that, when it passes through this first interface in the direction of the first outer face towards the second outer face, one passes from a first medium having a first refractive index at a second medium having a second refractive index higher than the first, at least one second interface comprising a second network of microreliefs and arranged so that, when the second interface is crossed in the direction of the first outer face towards the second face exterior, passing from a third medium having a third refractive index to a fourth medium having a fourth index of refraction inf érieur the third, each interface having at least one offset portion relative to the other interface when the structure is observed following a direction substantially perpendicular to at least one of the outer faces.

Interfaces can for example generate optical effects, possibly variable according to the angle of observation, which are different from one interface to another.

The invention thus creates, in visible and / or infrared and / or ultraviolet light, new visual effects for example to improve the appearance of a document and / or safety of it against an attempted infringement.

Interfaces can, where appropriate, be completely offset with respect to one another, 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 to the visual appearance of an area surrounding it.

The pattern may comprise, for example an alphanumeric character, a symbol, a logo or design.

In an exemplary implementation of the invention, at least one of the microreliefs networks is superimposed at least partially, in particular exactly, in an area substantially smooth, lacking 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 ambient air. The second and third areas can be formed for example by a same material and have the same refractive index, in particular a material having a refractive index greater than 1, in particular 1.5, for example 2. Alternatively, the second and third media can 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 is formed the first network of microreliefs and the second medium with a second material deposited, in particular by vacuum deposition, on the first material.

The second material may partially or completely cover the first material and forming, if desired, at least one unit. The second material may be formed, if necessary, an outer protection of the optical structure and have a refractive index, for example greater than 1.8. The second material may be obtained for example by spraying, for example of zinc sulfide 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 to 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 to 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 viewing angles range, 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 laces, including visible and / or infrared and / or ultraviolet.

At least one of the interfaces may be arranged so 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 one side outdoor, including visible and / or infrared and / or ultraviolet.

Advantageously, at least one of the interfaces is arranged so that, for a first viewing angle range, a portion of the structure to the right of this interface appears essentially transparent when the structure is observed from an outer face predetermined and, for a second viewing angles range, this portion of the structure appears essentially reflective when the structure is observed from said outer face.

Thus, when the or interfaces have a contour defining a pattern, it may appear in visible light, with a transparent or reflective appearance depending on the angle of observation of the structure.

The invention may, if necessary, allow, by varying the observation angle, to see the pattern successively positive with a reflective appearance and surrounded by a transparent zone and negative, with a clear appearance , surrounded by a reflecting zone. In an exemplary implementation of the invention, at least one of the microreliefs presents a substantially triangular prism shape.

The microrelief network can be arranged for example so as to restore a metallised appearance, in particular reflective, when the optical structure is observed following a predetermined range of angles. The microrelief or networks can for example be similar to the one on the film sold by 3M under the name Scotch ™ Optical Lighting Film.

In another example implementation of the invention, at least one of the microreliefs comprises at least one curved surface, concave or convex, each curved surface can create a lens effect.

The curved surface may for example be a half-cylindrical surface or a spherical cap, in particular hemispherical, this list not being limiting.

Preferably, the microreliefs have a thickness greater than the visible light wavelengths, possibly near infrared ray or ultraviolet.

Microrelief may have a thickness, for example greater than 1 .mu.m.

The thickness of the micro-reliefs is preferably less than 10 mm, particularly 1 mm. In an exemplary implementation of the invention, at least a portion of the micro-reliefs extending along a longitudinal direction, the microrelief being substantially parallel to each other. microreliefs of respectively the first and second networks may be the same or alternatively, different, e.g., having different shapes and / or sizes.

microreliefs of the first and second gratings can be made on a common carrier, on the same face of this support or on two opposite faces thereof.

The optical structure may comprise for example a support having on one side at least one microrelief network, the network of microreliefs is covered partially with a coating layer having a higher refractive index than that of the support so that the first interface is formed between the support and 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 can comprise for example zinc sulphide.

The optical structure according to the invention can thus be performed relatively easily because a single set of microreliefs can be used to form the two interfaces.

In another example implementation of the invention, the first and second micro-relief networks can be performed on separate media.

The structure may include, if desired, at least one electrically conductive material. Authentication and / or identification of the structure can thus be based on a measurement of the electrical conductivity of the latter, in addition to visual observation.

In an exemplary implementation of the invention, the structure comprises at least one support on which is formed at least part of the microreliefs, the support being in particular made of a substantially transparent polymeric material, such as polyester or PMMA ( polymethyl methacrylate).

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 of in particular between 1.5 mm and 100 mm, especially between 2 mm and 45 mm. The structure may, alternatively, substantially a shape selected from: a polygonal shape, for example rectangular or square, an oval shape, a circular shape, this list not being limiting.

If necessary, the structure can be arranged to be transferred at least partially on one face of a document, the structure may include at least one adhesive layer.

The structure may include, in addition to the microrelief network, at least one authentication and / or identification selected from at least one of the following: a highlight part of a falsification, particularly visible and / or detectable using a specific detection device, an element with a variable optical effect, interference and / or diffractive, iridescent, or liquid crystal, a magnetic coating, tracers detectable by X fluorescence, biomarkers, a varnish or an ink, luminescent tracers, fluorescent or phosphorescent, photochromic, thermochromic, electroluminescent and / or piezochromic and / or which change color on contact with one or more predetermined products.

The structure may include, where appropriate, at least one fluorescent material in the infrared and / or ultraviolet, deposited for example in the form of a layer, in particular on one of the faces of the structure.

The invention can thus permit observation in visible light under excitation by infrared radiation and / or ultraviolet, fluorescent underlying layer, through the portion of the transparent structure appearing for the first range of viewing angles .

For the second observation angle range, the one portion of the structure, being reflective, does not allow the observation of the fluorescence of the underlying layer.

The invention also relates to, according to another of its aspects, independently or in combination with the above, an optical structure comprising at least one microrelief network arranged such that, for a first range of angles of observation, the portion covered by the network structure appears essentially reflective when viewed from a predetermined side, 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 an angle and from a predetermined face, the structure has both at least one substantially transparent region and a substantially less reflecting area. The invention also relates to, according to another of its aspects, a sheet material comprising an optical structure as defined above.

The term "sheet material" may refer in the specification and claims a fibrous sheet based on cellulose fibers and / or synthetic, having a monolayer or multilayer structure, composite or not. A sheet material may for example have a relatively low thickness, in particular less than or equal to 3 mm, for example equal to about 100 .mu.m, and be flexible. In an exemplary implementation of the invention, the sheet material can be packaged into a coil, especially before being cut to the desired format. The term "sheet material" can also be a flexible or rigid film, monolithic or multilayer structure. The optical structure advantageously comprises at least a bulk portion on one side of the sheet material.

The optical structure may be partially embedded in the mass of the sheet material, comprising thereof including at least one clear optical structure leaving window. 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 by being glued onto said face.

In an exemplary implementation of the invention, the sheet material comprises at least one information element such as an alphanumeric character, a symbol, a logo or design, the optical structure being arranged so as to hide substantially the information element when the 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. As appropriate, to at least one of the first and second outer sides of the optical structure may be in contact with the ambient air or of the fibrous sheet material.

The invention also relates to, according to another of its aspects, a security document and / or value comprising a sheet material as defined above.

The document can be one of the following: a banknote, an identity document, a sheet or a passport cover, a visa, a coupon, a valuable document other than a banknote, for example a check or a credit card, a protective label and / or authentication, a traceability label. The invention also provides, in another of its aspects, a device for packaging, particularly a packaging, comprising a sheet material as defined above.

The invention also relates to, according to another of its aspects, a method of authenticating and / or identifying an article, in particular a document, comprising an optical structure as defined above, the method comprising the following steps :

- observing the visual effects, especially a transparent appearance and / or reflective of the optical structure, in particular in at least two different angles,

- conclusion about the authenticity and / or identity of the article at least thanks to this observation.

When the optical structure comprises at least one electrically conductive material, in particular non-metallic, for example a conductive polymer, the method may comprise the steps of:

- measuring the electrical conductivity of the structure, - conclusion about the authenticity and / or identity of the article at least by this measure.

The invention can be better understood from reading the detailed description that follows, examples of non-limiting embodiments of the invention, and on examining the accompanying drawing, in which: - Figures 1 and 2 represent, schematically and partially, an optical structure according to the invention, seen respectively along two different angles, Figure 3 illustrates, schematically and partially, a microrelief network of the optical structure of figures 1 and 2, Figure 4 illustrates very schematically the path of light beams in the structure of Figure 3, - Figure 5 shows, schematically and partially, in cross section, the optical structure of Figure 1, figures 6 and 7 show, schematically and partially, two compliant documents examples of the invention, Figure 8 is a diagrammatic and fragmentary perspective view, a package according to the invention, and figures 9 to 16 repres ntent schematically and partially in cross-section different 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. There is shown in Figures 1, 2 and 5 an optical structure 1 according to an exemplary implementation of the invention, having first and second opposed 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 only 4 of the face corresponding 2 or 3, as illustrated in Figure 5.

The structure 1 comprises a first interface 11 or second interface 12, formed by the microrelief or 5 of networks of the first side 2, respectively the second side 3, as illustrated in Figure 5.

Each network 5 comprises in this example microreliefs 6 shown in Figure 3, in the shape of triangular prism each having dimensions in cross-section, greater than the wavelengths of visible light, and optionally near infrared ray. These dimensions, particularly the thickness e of microreliefs, may for example be greater than 1 .mu.m, particularly 1.2 .mu.m. For example, the distance d between the vertices of two adjacent prisms may be between 100 .mu.m and 900 .mu.m, eg being close to 350 microns. The thickness e of a prism can be comprised for example between 50 .mu.m and 300 .mu.m, eg being close to 170 microns.

The maximum thickness E of the optical structure 1 may be between 100 .mu.m and 900 .mu.m, eg being close to 500 microns. As illustrated in Figure 3, the angle a between a local normal to the optical structure X 1 and one side of a microrelief 6 may be between 30 ° and 60 °, being for example about 45 °.

The dimensions and angles of microreliefs 6 are advantageously chosen according to the refractive index of the material or materials used in the structure 1. The microrelief 6 form parallel stripes in the example considered.

The microrelief 5 array can for example be similar to this on film marketed by US company 3M under the name Scotch ™ Optical Lighting Film.

The structure 1 is preferably flexible, which may for example be bendable. Microrelief 6 are formed on a material 15 having a refractive index higher than that of air, which material can be for example a transparent polymer such as polyester or PMMA.

Microrelief 6 may be obtained for example by etching, mechanical or chemical. Alternatively, the microrelief 6 may be obtained by printing an ink or embossing.

When it passes through the first interface 11 in the direction of the first face 2 toward the second side 3, one passes from a first medium of refractive index ni (formed by the ambient air) to a second medium (formed by the material 15) having a refractive index n 2 higher than U 1.

When it passes through the second interface 12 in the direction of the first face 2 toward the second side 3, passing from a third medium of index n 3 (formed by the material 15, with n 3 = n 2) a fourth medium (formed by the ambient air) of index with lower refractive 4 1I. So we 1I 4 = U 1. Each network of microreliefs 5 on the face 2, respectively on the face 3 is superposed exactly with a substantially smooth zone 8 of the other face. As illustrated in Figure 4, a light beam entering the optical structure 1, at a portion 4 of the second face 3 having a microrelief network 5, with an angle in the interval [ai;2] relative to the normal X, is reflected by the opposite face 2, so that the portion of the structure 1 to the network 5 of the right appears with a reflective appearance.

A light beam B enters the optical structure, at the portion 4, with an angle comprised in the interval] ao; a ^ relative to the normal X, spring 2 opposite the face so that the portion of the structure 1 to the network 5 of the right appears with a transparent appearance. Ao angles, a ^ and 2 may for example be substantially equal to 0 °, 45 ° and 90 °.

A light beam C enters the optical structure 1, at a substantially smooth area 8 of the first face 2, with an angle in the range

[3; su] relative to the normal X, is reflected by the microrelief network 5 on the opposite face 3 so that the portion of the structure to the right of the network 5 appears with a substantially reflective appearance.

D a light beam entering the optical structure 1 by the zone 8 at an angle in the range [su;5] relative to the normal X, spring through 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 3, su and 5 may for example be substantially equal to 0 °, 45 ° and 90 °.

The microrelief or 5 networks can define, positive or negative, at least a pattern 10 formed for example by a text, a symbol, a logo and / or drawing. When the optical structure is observed from one side 2 in a first range of angles, for example corresponding to the interval [su;5], the pattern 10 may appear substantially transparent surrounded by a substantially reflective area, as illustrated in Figure 1.

When the structure 1 is observed from the side 2 in a second range of angles, corresponding for example to the range [3; aj, the pattern 10 may appear with an aspect reflective substantially surrounded by a substantially transparent area, as shown in Figure 2. The structure 1 may comprise, if appropriate, a succession of units 10 are repeated regularly in a direction .

The microrelief network 5 may be arranged so as to restore a reflective metallic appearance according to the viewing angle. The material 15 on which are formed microrelief 5 networks may be based on a transparent polymer.

Authentication and / or identification with the structure 1 may thus include, where appropriate, the following steps: measuring the electrical conductivity of the structure 1, - conclusion about the authenticity and / or identity of the structure 1 at least through this measurement.

The structure 1 may have a strip shape with a width of in particular between 1.5 mm and 100 mm.

Figure 6 on a security document is shown and / or value 20 consisting of a banknote, the document comprising a sheet material 21 formed by a fibrous layer which is partially embedded in the optical structure 1.

The structure 1 extends from a first edge 23 of sheet material 21 to a second edge 24 opposite the first.

The sheet material 21 may comprise one or more windows 22 leaving unobscured optical structure 1.

The window or windows can be carried out for example using reliefs present on a rotating wire cylinder of a paper machine for manufacturing the sheet material, as described for example in patent applications EP 0 860 298 and EP 0 625 431. There is shown in Figure 7 an optical structure 1 having a shape, for example substantially rectangular, said structure 1 being affixed to a face of the sheet material 21, without being embedded in the mass of the material 21 , being for example glued on with an adhesive layer, optionally 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 is visible through a portion 26 of the structure 1 when this is observed following an adequate viewing angle. The information element 25 may for example be printed on one side of the sheet material 21.

The document 20 may be alternatively one of the following: an identity document, a sheet or a passport cover, a visa, a coupon, a valuable document other than a banknote, for example a check or a credit card, a protective label and / or authentication, a traceability label.

There is shown in Figure 8 a packaging device 30 such as a packing, 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 or networks of microreliefs 5, at least one authentication and / or identification selected from at least one of the following: a highlight part of a falsification, particularly visible and / or detectable using a specific detection device, an element with a variable optical effect, interference and / or diffractive, iridescent, or liquid crystal, a magnetic coating, tracers detectable by X fluorescence, biomarkers, a varnish or an ink, luminescent tracers , fluorescent or phosphorescent, photochromic, thermochromic, electroluminescent and / or piezochromic and / or which change color on contact with one or more predetermined products. The optical structure 1 may comprise a monolithic carrier 29 based on the material 15, on the faces 2 and 3 which are formed microreliefs 5 networks, as illustrated in Figure 5.

Alternatively, as illustrated in Figure 9, the optical structure 1 may comprise a monolithic carrier 30 such as a film, having a first completely smooth face 31 and, on a second face 32 opposite the first 31, portions covered 4 by one or more networks of microreliefs 5 separated 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 side a microrelief network 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 by both the face 31 of the support 30 and the network 5 of microreliefs of the element 33.

Microrelief 5 may for example be initially present on the entire face 32 of the support 30 and some of these micro-reliefs are subjected to a treatment to be removed, for example by etching or by mechanical action, to create the substantially smooth zones 8.

In the example illustrated in Figure 10, the optical structure 1 is formed of a plurality of elements 33 arranged on either side of an intermediate carrier 35 formed for example by a transparent film, so that a microrelief network 5 an element 33 on one side of the support 35 is disposed in line with a zone 36 free of element 33 on the other side of the support.

Alternatively, as illustrated in Figure 11, the elements 33 may be arranged on the same side of the holder 35 formed for example by a transparent adhesive film. At least one of the elements 33 may be derived for example the cutting of a monolithic carrier 30 with microreliefs, one or more elements 33 being turned over and returned to the space left by the cutout.

In the example illustrated in Figure 12, the optical structure 1 comprises two supports 30 with microreliefs fixed on two opposite sides of an intermediate support 35. In the example illustrated in Figure 13, the optical structure 1 is covered on each of its two opposite faces 2 and 3 of a layer of a coating 37 such as a transparent varnish. The assembly 39 thus formed has substantially smooth outer surfaces.

The layers 37 on the faces 2 and 3 can have indices of refraction identical or not.

There is shown in Figure 14 an optical structure 40 having a support 41 made of a transparent polymeric material, optionally combined with an electrically conductive polymer, and having opposed faces 42 and 43.

In the illustrated example, the face 42 of the bracket 41 is entirely covered by a microrelief network 5.

The face 43 is completely smooth, free of microreliefs. The optical structure 40 further comprises a coating layer 45 covering the microrelief network 5, on a portion of the face 42.

The coating layer 45 may be deposited for example by vacuum deposition, in particular by spraying, of a material having a refractive index higher than that of the support material 41.

The coating layer 45 contains, for example zinc sulfide having a refractive index of about 2.3, the carrier 41 being made for example based on a polymer having a refractive index of about 1.5.

The structure 40 thus has two interfaces formed by the microrelief 5. One of the interfaces between the material 15 from the ambient air and the other of the interfaces between the material 15 of the material of the coating layer 45, which allows to produce different optical effects depending on the viewing angle.

The coating layer 45 may have a thickness greater than the thickness of the microrelief network 5, as illustrated in Figure 14. Alternatively, the coating layer 45 may have a maximum thickness substantially equal to the thickness of the networks of microreliefs 5, as illustrated in Figure 15.

If desired, the layer 45 may form a pattern.

Of course, the invention is not limited to the implementation examples described above.

For example, micro-reliefs may have a form other than a prismatic shape.

Is illustrated in Figure 16 an optical structure 50 having, on each of the opposite faces 51 and 52, at least one network of microreliefs 53 microrelief each substantially having a shape of semi-cylinder.

Each network of microreliefs 53 extends opposite a substantially smooth portion 54 of the opposite face.

Microrelief 53 form lenses producing different optical effects depending on whether the light beam passes first through the network of microreliefs 53 or the substantially smooth zone 54, as can be seen from the paths of the light beams F and G in Figure 16. the characteristics of the various described embodiments may be combined together in variants not shown.

The term "comprising a" should be understood as being synonymous with "comprising at least one", unless otherwise specified.

Claims

1. Optical structure, especially for a security document and / or value, comprising: - first and second opposed outer faces,
- at least a first interface having a first network of microreliefs and arranged so that, when it passes through this first interface in the direction of the first outer face towards the second outer face, moving from a first medium having a first index of refraction to a second medium having a second refractive index higher than the first,
- at least one second interface comprising a second network of microreliefs and arranged so that when one passes through this second interface in the direction of the first outer face towards the second outer face, passing from a third medium having a third refractive index to a fourth medium having a fourth refractive index lower than the third, each interface having at least one offset portion relative to the other interface when the structure is observed following a direction substantially perpendicular to at least one outer faces.
2. Structure according to the preceding claim, wherein 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 one of the two preceding claims, wherein at least one of the interfaces has a contour defining a pattern such as an alphanumeric character, a symbol, a logo or design.
4. A structure according to any preceding claim, wherein at least one of the microreliefs networks is superimposed at least partially, in particular exactly, in a substantially smooth zone of one of the outer faces.
5. A structure according to any preceding claim, wherein at least one of the interfaces is formed on at least one of the outer faces of the structure.
6. Structure according to any one of the preceding claims, wherein at least one of the first and fourth circles is formed by the ambient air.
7. A structure according to any preceding claim, wherein the second and third media are formed by a same material.
8. Structure according to any one of claims 1 to 6, wherein the second and third media are formed by different materials and / or having different refractive indices.
9. A structure according to any preceding claim, wherein the first medium is formed by a first material on which is formed the first network of microreliefs and the second medium is formed by a second material deposited, in particular by vacuum deposition, on the first material.
10. A structure according to any preceding claim, wherein at least one of the interfaces is arranged so 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.
11. Structure according to the preceding claim, said interface being arranged to be transparent to visible light and / or infrared and / or ultraviolet light to the first viewing angles range.
12. A structure according to any preceding claim, wherein at least one of the interfaces is arranged so 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.
13. Structure according to the preceding claim, said interface being arranged to reflect the visible light and / or infrared and / or ultraviolet light to the second viewing angles range.
14. Structure according to claims 10 to 13, wherein at least one of the interfaces is arranged so 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 viewing angles range, this portion of the structure appears essentially reflective when the structure is observed from said outer face.
15. A structure according to any preceding claim, wherein at least one of the microreliefs presents a substantially triangular prism shape.
16. Structure according to the preceding claim, wherein the network of microreliefs is arranged to return a metallised appearance, in particular reflective, when the optical structure is observed following a predetermined range of angles.
17. A structure according to any preceding claim, wherein at least one of the microreliefs comprises at least one curved surface, concave or convex.
18. A structure according to any preceding claim, in which the microreliefs have a thickness greater than the visible light wavelengths, in particular near infrared ray, in particular greater than 1 .mu.m.
19. A structure according to any preceding claim, wherein at least a portion of the micro-reliefs extending along a longitudinal direction, the microrelief being substantially parallel to each other.
20. A structure according to any preceding claim, wherein the microrelief respectively the first and second networks are identical.
21. A structure according to any preceding claim, wherein the first and second networks microreliefs are formed on a common support.
22. A structure according to any preceding claim, comprising a support with on at least one face a network of microreliefs, the microreliefs array being partially covered by a coating layer having a higher refractive index than that of the support so that the first interface is formed between the support and ambient air and the second interface between the support and the coating layer, the first and second interfaces being in particular adjacent.
23. Structure according to any one of claims 1 to 20, wherein the first and second networks of microreliefs are formed on separate substrates.
24. A structure according to any preceding claim, comprising at least one electrically conductive material.
25. A structure according to any preceding claim, comprising at least one support on which is formed at least a portion of the microreliefs, the support being made of a substantially transparent material, in particular a polymer.
26. A structure according to any preceding claim, comprising at least one fluorescent material in the infrared and / or ultraviolet.
27. A structure according to any preceding claim, wherein the difference between the second refractive index and the first refractive index and / or between the third refractive index and the fourth refractive index is greater than 0.1.
28. Structure according to the preceding claim, wherein said difference is greater than 0.2.
29. Structure according to claims 27 or 28, wherein said difference is between 0.4 and 0.6.
30. A sheet material comprising an optical structure according to any preceding claim.
31. Material according to the preceding claim, wherein the optical structure is at least partially embedded in the mass of the sheet material.
32. Material according to the preceding claim, comprising at least one leaving open the window optical structure.
33. Material according to any one of claims 30 to 32, comprising at least one information element, the optical structure being arranged so as to substantially mask the element of information when the optical structure is observed following a first range angles and has a reflective appearance.
34. A sheet material according to any one of claims 30 to 33, having a base of cellulose and / or synthetic.
35. A security document and / or value comprising a sheet material as defined in any one of claims 30 to 34.
36. A packaging, particularly a packaging, comprising a sheet material defined in any one of claims 30 to 34.
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)

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

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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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FR2893424A1 (en) 2007-05-18
ES2322874T5 (en) 2015-09-18
ES2322874T3 (en) 2009-06-30
US8439402B2 (en) 2013-05-14
DE602006005395D1 (en) 2009-04-09
WO2007057613A1 (en) 2007-05-24
AT423687T (en) 2009-03-15
CA2629926A1 (en) 2007-05-24
US20090121473A1 (en) 2009-05-14
EP1951528B1 (en) 2009-02-25
BRPI0618742A2 (en) 2011-09-13
EP1951528B2 (en) 2015-06-24
FR2893424B1 (en) 2008-01-25

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